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Commit | Line | Data |
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56e12059 | 1 | // tapset resolution |
ef36f781 | 2 | // Copyright (C) 2005-2014 Red Hat Inc. |
aa30ccd3 | 3 | // Copyright (C) 2005-2007 Intel Corporation. |
0b8f6579 | 4 | // Copyright (C) 2008 James.Bottomley@HansenPartnership.com |
56e12059 FCE |
5 | // |
6 | // This file is part of systemtap, and is free software. You can | |
7 | // redistribute it and/or modify it under the terms of the GNU General | |
8 | // Public License (GPL); either version 2, or (at your option) any | |
9 | // later version. | |
10 | ||
11 | #include "config.h" | |
12 | #include "staptree.h" | |
13 | #include "elaborate.h" | |
b55bc428 | 14 | #include "tapsets.h" |
93646f4d | 15 | #include "task_finder.h" |
f31a77f5 | 16 | #include "tapset-dynprobe.h" |
56e12059 | 17 | #include "translate.h" |
dc38c0ae | 18 | #include "session.h" |
72dbc915 | 19 | #include "util.h" |
0a6f5a3f | 20 | #include "buildrun.h" |
86bf665e | 21 | #include "dwarf_wrappers.h" |
2e67a43b | 22 | #include "auto_free.h" |
b278033a | 23 | #include "hash.h" |
440f755a | 24 | #include "dwflpp.h" |
5f8ca04f | 25 | #include "setupdwfl.h" |
6b51ee12 | 26 | #include <gelf.h> |
22d737e8 | 27 | |
4d0d9e8a | 28 | #include "sdt_types.h" |
bd2b1e68 | 29 | |
3b579393 FCE |
30 | #include <cstdlib> |
31 | #include <algorithm> | |
bd2b1e68 | 32 | #include <deque> |
56e12059 | 33 | #include <iostream> |
d1bcbe71 | 34 | #include <fstream> |
bd2b1e68 | 35 | #include <map> |
ec4373ff | 36 | #include <set> |
56e12059 | 37 | #include <sstream> |
bd2b1e68 | 38 | #include <stdexcept> |
b55bc428 | 39 | #include <vector> |
67959c62 | 40 | #include <stack> |
e36387d7 | 41 | #include <cstdarg> |
29e64872 | 42 | #include <cassert> |
1969b5bc | 43 | #include <iomanip> |
f781f849 | 44 | #include <cerrno> |
bd2b1e68 GH |
45 | |
46 | extern "C" { | |
df8fadee | 47 | #include <fcntl.h> |
bd2b1e68 | 48 | #include <elfutils/libdwfl.h> |
7a053d3b | 49 | #include <elfutils/libdw.h> |
77de5e9e GH |
50 | #include <dwarf.h> |
51 | #include <elf.h> | |
52 | #include <obstack.h> | |
b20febf3 | 53 | #include <glob.h> |
30a279be | 54 | #include <fnmatch.h> |
5f0a03a6 | 55 | #include <stdio.h> |
349dc70e | 56 | #include <sys/types.h> |
37001baa | 57 | #include <sys/stat.h> |
aaf7ffe8 | 58 | #include <math.h> |
aff5d390 | 59 | #include <regex.h> |
37001baa | 60 | #include <unistd.h> |
4b1ad75e RM |
61 | |
62 | #define __STDC_FORMAT_MACROS | |
63 | #include <inttypes.h> | |
bd2b1e68 | 64 | } |
77de5e9e | 65 | |
508059f0 MW |
66 | // Old elf.h doesn't know about this machine type. |
67 | #ifndef EM_AARCH64 | |
68 | #define EM_AARCH64 183 | |
69 | #endif | |
70 | ||
56e12059 FCE |
71 | |
72 | using namespace std; | |
2171f774 | 73 | using namespace __gnu_cxx; |
56e12059 | 74 | |
47dd066d | 75 | |
b20febf3 FCE |
76 | |
77 | // ------------------------------------------------------------------------ | |
faea5e16 JS |
78 | |
79 | string | |
80 | common_probe_init (derived_probe* p) | |
81 | { | |
26e63673 JS |
82 | assert(p->session_index != (unsigned)-1); |
83 | return "(&stap_probes[" + lex_cast(p->session_index) + "])"; | |
faea5e16 JS |
84 | } |
85 | ||
86 | ||
b20febf3 | 87 | void |
71db462b DS |
88 | common_probe_entryfn_prologue (systemtap_session& s, |
89 | string statestr, string probe, | |
90 | string probe_type, bool overload_processing) | |
b20febf3 | 91 | { |
944c9a7a | 92 | if (s.runtime_usermode_p()) |
ac34f2aa JS |
93 | { |
94 | // If session_state() is NULL, then we haven't even initialized shm yet, | |
95 | // and there's *nothing* for the probe to do. (even alibi is in shm) | |
96 | // So failure skips this whole block through the end of the epilogue. | |
97 | s.op->newline() << "if (likely(session_state())) {"; | |
e481ab2e | 98 | s.op->indent(1); |
ac34f2aa JS |
99 | } |
100 | ||
71db462b | 101 | s.op->newline() << "#ifdef STP_ALIBI"; |
7c3e97f4 | 102 | s.op->newline() << "atomic_inc(probe_alibi(" << probe << "->index));"; |
71db462b | 103 | s.op->newline() << "#else"; |
653e6a9a | 104 | |
e481ab2e JS |
105 | if (s.runtime_usermode_p()) |
106 | s.op->newline() << "int _stp_saved_errno = errno;"; | |
107 | ||
fee09ad5 | 108 | s.op->newline() << "struct context* __restrict__ c = NULL;"; |
71db462b DS |
109 | s.op->newline() << "#if !INTERRUPTIBLE"; |
110 | s.op->newline() << "unsigned long flags;"; | |
111 | s.op->newline() << "#endif"; | |
b20febf3 | 112 | |
f887a8c9 | 113 | s.op->newline() << "#ifdef STP_TIMING"; |
7c3e97f4 | 114 | s.op->newline() << "Stat stat = probe_timing(" << probe << "->index);"; |
f887a8c9 DS |
115 | s.op->newline() << "#endif"; |
116 | if (overload_processing && !s.runtime_usermode_p()) | |
71db462b | 117 | s.op->newline() << "#if defined(STP_TIMING) || defined(STP_OVERLOAD)"; |
a58d79d0 | 118 | else |
71db462b | 119 | s.op->newline() << "#ifdef STP_TIMING"; |
b20febf3 | 120 | |
f887a8c9 DS |
121 | if (! s.runtime_usermode_p()) |
122 | s.op->newline() << "cycles_t cycles_atstart = get_cycles ();"; | |
123 | else | |
124 | { | |
125 | s.op->newline() << "struct timespec timespec_atstart;"; | |
45639d96 | 126 | s.op->newline() << "(void)clock_gettime(CLOCK_MONOTONIC, ×pec_atstart);"; |
f887a8c9 | 127 | } |
71db462b | 128 | s.op->newline() << "#endif"; |
994aac0e | 129 | |
d2d39de6 | 130 | s.op->newline() << "#if !INTERRUPTIBLE"; |
71db462b DS |
131 | s.op->newline() << "local_irq_save (flags);"; |
132 | s.op->newline() << "#endif"; | |
b20febf3 | 133 | |
ac3af990 | 134 | if (! s.runtime_usermode_p()) |
71db462b DS |
135 | { |
136 | // Check for enough free enough stack space | |
137 | s.op->newline() << "if (unlikely ((((unsigned long) (& c)) & (THREAD_SIZE-1))"; // free space | |
138 | s.op->newline(1) << "< (MINSTACKSPACE + sizeof (struct thread_info)))) {"; // needed space | |
139 | // XXX: may need porting to platforms where task_struct is not | |
140 | // at bottom of kernel stack NB: see also | |
141 | // CONFIG_DEBUG_STACKOVERFLOW | |
065d5567 | 142 | s.op->newline() << "atomic_inc (skipped_count());"; |
71db462b | 143 | s.op->newline() << "#ifdef STP_TIMING"; |
065d5567 | 144 | s.op->newline() << "atomic_inc (skipped_count_lowstack());"; |
71db462b DS |
145 | s.op->newline() << "#endif"; |
146 | s.op->newline() << "goto probe_epilogue;"; | |
147 | s.op->newline(-1) << "}"; | |
148 | } | |
c931ec8a | 149 | |
065d5567 | 150 | s.op->newline() << "if (atomic_read (session_state()) != " << statestr << ")"; |
71db462b DS |
151 | s.op->newline(1) << "goto probe_epilogue;"; |
152 | s.op->indent(-1); | |
9a604fac | 153 | |
1d0e697d | 154 | s.op->newline() << "c = _stp_runtime_entryfn_get_context();"; |
d2d39de6 | 155 | s.op->newline() << "if (!c) {"; |
71db462b | 156 | s.op->newline(1) << "#if !INTERRUPTIBLE"; |
065d5567 | 157 | s.op->newline() << "atomic_inc (skipped_count());"; |
71db462b DS |
158 | s.op->newline() << "#endif"; |
159 | s.op->newline() << "#ifdef STP_TIMING"; | |
065d5567 | 160 | s.op->newline() << "atomic_inc (skipped_count_reentrant());"; |
71db462b | 161 | s.op->newline() << "#endif"; |
71db462b DS |
162 | s.op->newline() << "goto probe_epilogue;"; |
163 | s.op->newline(-1) << "}"; | |
d2d39de6 | 164 | |
71db462b DS |
165 | s.op->newline(); |
166 | s.op->newline() << "c->last_stmt = 0;"; | |
167 | s.op->newline() << "c->last_error = 0;"; | |
168 | s.op->newline() << "c->nesting = -1;"; // NB: PR10516 packs locals[] tighter | |
169 | s.op->newline() << "c->uregs = 0;"; | |
170 | s.op->newline() << "c->kregs = 0;"; | |
171 | s.op->newline() << "#if defined __ia64__"; | |
172 | s.op->newline() << "c->unwaddr = 0;"; | |
173 | s.op->newline() << "#endif"; | |
f4d70a33 JS |
174 | if (s.runtime_usermode_p()) |
175 | s.op->newline() << "c->probe_index = " << probe << "->index;"; | |
71db462b DS |
176 | s.op->newline() << "c->probe_point = " << probe << "->pp;"; |
177 | s.op->newline() << "#ifdef STP_NEED_PROBE_NAME"; | |
178 | s.op->newline() << "c->probe_name = " << probe << "->pn;"; | |
179 | s.op->newline() << "#endif"; | |
180 | s.op->newline() << "c->probe_type = " << probe_type << ";"; | |
6dceb5c9 | 181 | // reset Individual Probe State union |
71db462b | 182 | s.op->newline() << "memset(&c->ips, 0, sizeof(c->ips));"; |
e04b5d74 | 183 | s.op->newline() << "c->user_mode_p = 0; c->full_uregs_p = 0;"; |
71db462b DS |
184 | s.op->newline() << "#ifdef STAP_NEED_REGPARM"; // i386 or x86_64 register.stp |
185 | s.op->newline() << "c->regparm = 0;"; | |
186 | s.op->newline() << "#endif"; | |
e0a17418 | 187 | |
152fa051 LB |
188 | if(!s.suppress_time_limits){ |
189 | s.op->newline() << "#if INTERRUPTIBLE"; | |
190 | s.op->newline() << "c->actionremaining = MAXACTION_INTERRUPTIBLE;"; | |
191 | s.op->newline() << "#else"; | |
192 | s.op->newline() << "c->actionremaining = MAXACTION;"; | |
193 | s.op->newline() << "#endif"; | |
194 | } | |
9915575b FCE |
195 | // NB: The following would actually be incorrect. |
196 | // That's because cycles_sum/cycles_base values are supposed to survive | |
197 | // between consecutive probes. Periodically (STP_OVERLOAD_INTERVAL | |
198 | // cycles), the values will be reset. | |
199 | /* | |
71db462b DS |
200 | s.op->newline() << "#ifdef STP_OVERLOAD"; |
201 | s.op->newline() << "c->cycles_sum = 0;"; | |
202 | s.op->newline() << "c->cycles_base = 0;"; | |
203 | s.op->newline() << "#endif"; | |
9915575b | 204 | */ |
44cfbe25 SM |
205 | |
206 | s.op->newline() << "#if defined(STP_NEED_UNWIND_DATA)"; | |
207 | s.op->newline() << "c->uwcache_user.state = uwcache_uninitialized;"; | |
208 | s.op->newline() << "c->uwcache_kernel.state = uwcache_uninitialized;"; | |
209 | s.op->newline() << "#endif"; | |
b20febf3 | 210 | } |
9a604fac | 211 | |
a44a0785 | 212 | |
b20febf3 | 213 | void |
f887a8c9 DS |
214 | common_probe_entryfn_epilogue (systemtap_session& s, |
215 | bool overload_processing) | |
b20febf3 | 216 | { |
f887a8c9 DS |
217 | if (overload_processing && !s.runtime_usermode_p()) |
218 | s.op->newline() << "#if defined(STP_TIMING) || defined(STP_OVERLOAD)"; | |
a58d79d0 | 219 | else |
f887a8c9 DS |
220 | s.op->newline() << "#ifdef STP_TIMING"; |
221 | s.op->newline() << "{"; | |
222 | s.op->indent(1); | |
223 | if (! s.runtime_usermode_p()) | |
224 | { | |
225 | s.op->newline() << "cycles_t cycles_atend = get_cycles ();"; | |
226 | // NB: we truncate cycles counts to 32 bits. Perhaps it should be | |
227 | // fewer, if the hardware counter rolls over really quickly. We | |
228 | // handle 32-bit wraparound here. | |
229 | s.op->newline() << "int32_t cycles_elapsed = ((int32_t)cycles_atend > (int32_t)cycles_atstart)"; | |
230 | s.op->newline(1) << "? ((int32_t)cycles_atend - (int32_t)cycles_atstart)"; | |
231 | s.op->newline() << ": (~(int32_t)0) - (int32_t)cycles_atstart + (int32_t)cycles_atend + 1;"; | |
232 | s.op->indent(-1); | |
233 | } | |
234 | else | |
235 | { | |
236 | s.op->newline() << "struct timespec timespec_atend, timespec_elapsed;"; | |
237 | s.op->newline() << "long cycles_elapsed;"; | |
45639d96 | 238 | s.op->newline() << "(void)clock_gettime(CLOCK_MONOTONIC, ×pec_atend);"; |
f887a8c9 DS |
239 | s.op->newline() << "_stp_timespec_sub(×pec_atend, ×pec_atstart, ×pec_elapsed);"; |
240 | // 'cycles_elapsed' is really elapsed nanoseconds | |
241 | s.op->newline() << "cycles_elapsed = (timespec_elapsed.tv_sec * NSEC_PER_SEC) + timespec_elapsed.tv_nsec;"; | |
242 | } | |
243 | ||
244 | s.op->newline() << "#ifdef STP_TIMING"; | |
245 | s.op->newline() << "if (likely (stat)) _stp_stat_add(stat, cycles_elapsed);"; | |
246 | s.op->newline() << "#endif"; | |
247 | ||
248 | if (overload_processing && !s.runtime_usermode_p()) | |
249 | { | |
250 | s.op->newline() << "#ifdef STP_OVERLOAD"; | |
251 | s.op->newline() << "{"; | |
a58d79d0 DS |
252 | // If the cycle count has wrapped (cycles_atend > cycles_base), |
253 | // let's go ahead and pretend the interval has been reached. | |
254 | // This should reset cycles_base and cycles_sum. | |
f887a8c9 DS |
255 | s.op->newline(1) << "cycles_t interval = (cycles_atend > c->cycles_base)"; |
256 | s.op->newline(1) << "? (cycles_atend - c->cycles_base)"; | |
257 | s.op->newline() << ": (STP_OVERLOAD_INTERVAL + 1);"; | |
258 | s.op->newline(-1) << "c->cycles_sum += cycles_elapsed;"; | |
a58d79d0 DS |
259 | |
260 | // If we've spent more than STP_OVERLOAD_THRESHOLD cycles in a | |
261 | // probe during the last STP_OVERLOAD_INTERVAL cycles, the probe | |
262 | // has overloaded the system and we need to quit. | |
7baf48e9 FCE |
263 | // NB: this is not suppressible via --suppress-runtime-errors, |
264 | // because this is a system safety metric that we cannot trust | |
265 | // unprivileged users to override. | |
f887a8c9 DS |
266 | s.op->newline() << "if (interval > STP_OVERLOAD_INTERVAL) {"; |
267 | s.op->newline(1) << "if (c->cycles_sum > STP_OVERLOAD_THRESHOLD) {"; | |
268 | s.op->newline(1) << "_stp_error (\"probe overhead exceeded threshold\");"; | |
065d5567 JS |
269 | s.op->newline() << "atomic_set (session_state(), STAP_SESSION_ERROR);"; |
270 | s.op->newline() << "atomic_inc (error_count());"; | |
f887a8c9 DS |
271 | s.op->newline(-1) << "}"; |
272 | ||
273 | s.op->newline() << "c->cycles_base = cycles_atend;"; | |
274 | s.op->newline() << "c->cycles_sum = 0;"; | |
275 | s.op->newline(-1) << "}"; | |
276 | s.op->newline(-1) << "}"; | |
277 | s.op->newline() << "#endif"; | |
a58d79d0 | 278 | } |
e57b735a | 279 | |
f887a8c9 DS |
280 | s.op->newline(-1) << "}"; |
281 | s.op->newline() << "#endif"; | |
e57b735a | 282 | |
f887a8c9 DS |
283 | s.op->newline() << "c->probe_point = 0;"; // vacated |
284 | s.op->newline() << "#ifdef STP_NEED_PROBE_NAME"; | |
285 | s.op->newline() << "c->probe_name = 0;"; | |
286 | s.op->newline() << "#endif"; | |
287 | s.op->newline() << "c->probe_type = 0;"; | |
7baf48e9 FCE |
288 | |
289 | ||
f887a8c9 DS |
290 | s.op->newline() << "if (unlikely (c->last_error && c->last_error[0])) {"; |
291 | s.op->indent(1); | |
292 | if (s.suppress_handler_errors) // PR 13306 | |
b78a0fbb | 293 | { |
065d5567 | 294 | s.op->newline() << "atomic_inc (error_count());"; |
7baf48e9 FCE |
295 | } |
296 | else | |
297 | { | |
f887a8c9 DS |
298 | s.op->newline() << "if (c->last_stmt != NULL)"; |
299 | s.op->newline(1) << "_stp_softerror (\"%s near %s\", c->last_error, c->last_stmt);"; | |
300 | s.op->newline(-1) << "else"; | |
301 | s.op->newline(1) << "_stp_softerror (\"%s\", c->last_error);"; | |
302 | s.op->indent(-1); | |
065d5567 JS |
303 | s.op->newline() << "atomic_inc (error_count());"; |
304 | s.op->newline() << "if (atomic_read (error_count()) > MAXERRORS) {"; | |
305 | s.op->newline(1) << "atomic_set (session_state(), STAP_SESSION_ERROR);"; | |
f887a8c9 DS |
306 | s.op->newline() << "_stp_exit ();"; |
307 | s.op->newline(-1) << "}"; | |
7baf48e9 FCE |
308 | } |
309 | ||
f887a8c9 | 310 | s.op->newline(-1) << "}"; |
7baf48e9 FCE |
311 | |
312 | ||
f887a8c9 DS |
313 | s.op->newline(-1) << "probe_epilogue:"; // context is free |
314 | s.op->indent(1); | |
e57b735a | 315 | |
f887a8c9 | 316 | if (! s.suppress_handler_errors) // PR 13306 |
7baf48e9 FCE |
317 | { |
318 | // Check for excessive skip counts. | |
065d5567 JS |
319 | s.op->newline() << "if (unlikely (atomic_read (skipped_count()) > MAXSKIPPED)) {"; |
320 | s.op->newline(1) << "if (unlikely (pseudo_atomic_cmpxchg(session_state(), STAP_SESSION_RUNNING, STAP_SESSION_ERROR) == STAP_SESSION_RUNNING))"; | |
f887a8c9 DS |
321 | s.op->newline() << "_stp_error (\"Skipped too many probes, check MAXSKIPPED or try again with stap -t for more details.\");"; |
322 | s.op->newline(-1) << "}"; | |
7baf48e9 | 323 | } |
e57b735a | 324 | |
d2d39de6 JS |
325 | // We mustn't release the context until after all _stp_error(), so dyninst |
326 | // mode can still access the log buffers stored therein. | |
327 | s.op->newline() << "_stp_runtime_entryfn_put_context(c);"; | |
328 | ||
329 | s.op->newline() << "#if !INTERRUPTIBLE"; | |
f887a8c9 DS |
330 | s.op->newline() << "local_irq_restore (flags);"; |
331 | s.op->newline() << "#endif"; | |
653e6a9a | 332 | |
944c9a7a | 333 | if (s.runtime_usermode_p()) |
ac34f2aa JS |
334 | { |
335 | s.op->newline() << "errno = _stp_saved_errno;"; | |
ac34f2aa | 336 | } |
e481ab2e JS |
337 | |
338 | s.op->newline() << "#endif // STP_ALIBI"; | |
339 | ||
340 | if (s.runtime_usermode_p()) | |
341 | s.op->newline(-1) << "}"; | |
440f755a | 342 | } |
e57b735a | 343 | |
e57b735a | 344 | |
440f755a | 345 | // ------------------------------------------------------------------------ |
e57b735a | 346 | |
440f755a JS |
347 | // ------------------------------------------------------------------------ |
348 | // Dwarf derived probes. "We apologize for the inconvience." | |
349 | // ------------------------------------------------------------------------ | |
e57b735a | 350 | |
4627ed58 JS |
351 | static const string TOK_KERNEL("kernel"); |
352 | static const string TOK_MODULE("module"); | |
353 | static const string TOK_FUNCTION("function"); | |
354 | static const string TOK_INLINE("inline"); | |
355 | static const string TOK_CALL("call"); | |
4bda987e | 356 | static const string TOK_EXPORTED("exported"); |
4627ed58 JS |
357 | static const string TOK_RETURN("return"); |
358 | static const string TOK_MAXACTIVE("maxactive"); | |
359 | static const string TOK_STATEMENT("statement"); | |
360 | static const string TOK_ABSOLUTE("absolute"); | |
361 | static const string TOK_PROCESS("process"); | |
a794dbeb | 362 | static const string TOK_PROVIDER("provider"); |
4627ed58 JS |
363 | static const string TOK_MARK("mark"); |
364 | static const string TOK_TRACE("trace"); | |
365 | static const string TOK_LABEL("label"); | |
63b4fd14 | 366 | static const string TOK_LIBRARY("library"); |
576eaefe | 367 | static const string TOK_PLT("plt"); |
e7d4410d LB |
368 | static const string TOK_METHOD("method"); |
369 | static const string TOK_CLASS("class");; | |
c31add50 JL |
370 | static const string TOK_CALLEE("callee");; |
371 | static const string TOK_CALLEES("callees");; | |
e57b735a | 372 | |
440f755a JS |
373 | // Can we handle this query with just symbol-table info? |
374 | enum dbinfo_reqt | |
375 | { | |
376 | dbr_unknown, | |
377 | dbr_none, // kernel.statement(NUM).absolute | |
378 | dbr_need_symtab, // can get by with symbol table if there's no dwarf | |
379 | dbr_need_dwarf | |
380 | }; | |
e57b735a | 381 | |
20e4a32c | 382 | |
673d0add | 383 | struct dwarf_query; // forward decl |
20e4a32c | 384 | |
45582cbc JL |
385 | static int query_cu (Dwarf_Die * cudie, dwarf_query *q); |
386 | static void query_addr(Dwarf_Addr addr, dwarf_query *q); | |
387 | static void query_plt_statement(dwarf_query *q); | |
a781f401 | 388 | |
440f755a JS |
389 | struct |
390 | symbol_table | |
391 | { | |
392 | module_info *mod_info; // associated module | |
393 | map<string, func_info*> map_by_name; | |
1c6b77e5 | 394 | multimap<Dwarf_Addr, func_info*> map_by_addr; |
2a4acb09 JL |
395 | map<string, Dwarf_Addr> globals; |
396 | map<string, Dwarf_Addr> locals; | |
1c6b77e5 | 397 | typedef multimap<Dwarf_Addr, func_info*>::iterator iterator_t; |
440f755a JS |
398 | typedef pair<iterator_t, iterator_t> range_t; |
399 | #ifdef __powerpc__ | |
400 | GElf_Word opd_section; | |
401 | #endif | |
2867a2a1 JS |
402 | void add_symbol(const char *name, bool weak, bool descriptor, |
403 | Dwarf_Addr addr, Dwarf_Addr *high_addr); | |
440f755a JS |
404 | enum info_status get_from_elf(); |
405 | void prepare_section_rejection(Dwfl_Module *mod); | |
406 | bool reject_section(GElf_Word section); | |
440f755a JS |
407 | void purge_syscall_stubs(); |
408 | func_info *lookup_symbol(const string& name); | |
409 | Dwarf_Addr lookup_symbol_address(const string& name); | |
410 | func_info *get_func_containing_address(Dwarf_Addr addr); | |
3d372d6b | 411 | func_info *get_first_func(); |
7a053d3b | 412 | |
440f755a JS |
413 | symbol_table(module_info *mi) : mod_info(mi) {} |
414 | ~symbol_table(); | |
415 | }; | |
77de5e9e | 416 | |
440f755a JS |
417 | static bool null_die(Dwarf_Die *die) |
418 | { | |
822a6a3d | 419 | static Dwarf_Die null; |
440f755a JS |
420 | return (!die || !memcmp(die, &null, sizeof(null))); |
421 | } | |
c4ce66a1 JS |
422 | |
423 | ||
7a053d3b | 424 | enum |
bd2b1e68 | 425 | function_spec_type |
7a053d3b | 426 | { |
bd2b1e68 GH |
427 | function_alone, |
428 | function_and_file, | |
7a053d3b | 429 | function_file_and_line |
bd2b1e68 GH |
430 | }; |
431 | ||
ec4373ff | 432 | |
bd2b1e68 | 433 | struct dwarf_builder; |
f10534c6 | 434 | struct dwarf_var_expanding_visitor; |
77de5e9e | 435 | |
2930abc7 | 436 | |
b20febf3 FCE |
437 | // XXX: This class is a candidate for subclassing to separate |
438 | // the relocation vs non-relocation variants. Likewise for | |
439 | // kprobe vs kretprobe variants. | |
440 | ||
441 | struct dwarf_derived_probe: public derived_probe | |
b55bc428 | 442 | { |
b20febf3 FCE |
443 | dwarf_derived_probe (const string& function, |
444 | const string& filename, | |
445 | int line, | |
446 | const string& module, | |
447 | const string& section, | |
448 | Dwarf_Addr dwfl_addr, | |
2930abc7 | 449 | Dwarf_Addr addr, |
b20febf3 FCE |
450 | dwarf_query & q, |
451 | Dwarf_Die* scope_die); | |
20e4a32c | 452 | |
b20febf3 FCE |
453 | string module; |
454 | string section; | |
455 | Dwarf_Addr addr; | |
63b4fd14 | 456 | string path; |
27dc09b1 | 457 | bool has_process; |
2930abc7 | 458 | bool has_return; |
c9bad430 | 459 | bool has_maxactive; |
63b4fd14 | 460 | bool has_library; |
c9bad430 | 461 | long maxactive_val; |
4ad95bbc | 462 | // dwarf_derived_probe_group::emit_module_decls uses this to emit sdt kprobe definition |
b642c901 SC |
463 | string user_path; |
464 | string user_lib; | |
b95e2b79 | 465 | bool access_vars; |
2930abc7 | 466 | |
af234c40 JS |
467 | unsigned saved_longs, saved_strings; |
468 | dwarf_derived_probe* entry_handler; | |
469 | ||
b8da0ad1 | 470 | void printsig (std::ostream &o) const; |
6b66b9f7 | 471 | virtual void join_group (systemtap_session& s); |
3689db05 | 472 | void emit_probe_local_init(systemtap_session& s, translator_output * o); |
d0bfd2ac | 473 | void getargs(std::list<std::string> &arg_set) const; |
0a98fd42 | 474 | |
42e38653 | 475 | void emit_privilege_assertion (translator_output*); |
27dc09b1 DB |
476 | void print_dupe_stamp(ostream& o); |
477 | ||
bd2b1e68 | 478 | // Pattern registration helpers. |
7a053d3b | 479 | static void register_statement_variants(match_node * root, |
27dc09b1 | 480 | dwarf_builder * dw, |
42e38653 | 481 | privilege_t privilege); |
fd6602a0 | 482 | static void register_function_variants(match_node * root, |
27dc09b1 | 483 | dwarf_builder * dw, |
42e38653 | 484 | privilege_t privilege); |
440d9b00 DB |
485 | static void register_function_and_statement_variants(systemtap_session& s, |
486 | match_node * root, | |
27dc09b1 | 487 | dwarf_builder * dw, |
42e38653 | 488 | privilege_t privilege); |
b1615c74 JS |
489 | static void register_sdt_variants(systemtap_session& s, |
490 | match_node * root, | |
491 | dwarf_builder * dw); | |
492 | static void register_plt_variants(systemtap_session& s, | |
493 | match_node * root, | |
494 | dwarf_builder * dw); | |
c4ce66a1 | 495 | static void register_patterns(systemtap_session& s); |
6b66b9f7 JS |
496 | |
497 | protected: | |
498 | dwarf_derived_probe(probe *base, | |
499 | probe_point *location, | |
500 | Dwarf_Addr addr, | |
501 | bool has_return): | |
74fe61bc LB |
502 | derived_probe(base, location), addr(addr), has_process(0), |
503 | has_return(has_return), has_maxactive(0), has_library(0), | |
504 | maxactive_val(0), access_vars(false), saved_longs(0), | |
505 | saved_strings(0), entry_handler(0) | |
6b66b9f7 JS |
506 | {} |
507 | ||
508 | private: | |
d0bfd2ac | 509 | list<string> args; |
8c67c337 | 510 | void saveargs(dwarf_query& q, Dwarf_Die* scope_die, Dwarf_Addr dwfl_addr); |
20c6c071 GH |
511 | }; |
512 | ||
513 | // Helper struct to thread through the dwfl callbacks. | |
2c384610 | 514 | struct base_query |
20c6c071 | 515 | { |
c4ce66a1 JS |
516 | base_query(dwflpp & dw, literal_map_t const & params); |
517 | base_query(dwflpp & dw, const string & module_val); | |
2c384610 | 518 | virtual ~base_query() {} |
bd2b1e68 | 519 | |
5227f1ea | 520 | systemtap_session & sess; |
2c384610 | 521 | dwflpp & dw; |
5227f1ea | 522 | |
070764c0 JL |
523 | // Used to keep track of which modules were visited during |
524 | // iterate_over_modules() | |
525 | set<string> visited_modules; | |
526 | ||
bd2b1e68 | 527 | // Parameter extractors. |
86bf665e | 528 | static bool has_null_param(literal_map_t const & params, |
888af770 | 529 | string const & k); |
86bf665e | 530 | static bool get_string_param(literal_map_t const & params, |
bd2b1e68 | 531 | string const & k, string & v); |
86bf665e | 532 | static bool get_number_param(literal_map_t const & params, |
bd2b1e68 | 533 | string const & k, long & v); |
86bf665e | 534 | static bool get_number_param(literal_map_t const & params, |
c239d28c | 535 | string const & k, Dwarf_Addr & v); |
bbbc7241 | 536 | static void query_library_callback (base_query *me, const char *data); |
45cdb40e | 537 | static void query_plt_callback (base_query *me, const char *link, size_t addr); |
f301a9ff | 538 | virtual void query_library (const char *data) = 0; |
576eaefe | 539 | virtual void query_plt (const char *link, size_t addr) = 0; |
84c84ac4 | 540 | |
b55bc428 | 541 | |
2c384610 DS |
542 | // Extracted parameters. |
543 | bool has_kernel; | |
91af0778 FCE |
544 | bool has_module; |
545 | bool has_process; | |
63b4fd14 | 546 | bool has_library; |
576eaefe SC |
547 | bool has_plt; |
548 | bool has_statement; | |
2c384610 | 549 | string module_val; // has_kernel => module_val = "kernel" |
63b4fd14 | 550 | string path; // executable path if module is a .so |
576eaefe | 551 | string plt_val; // has_plt => plt wildcard |
c88bcbe8 | 552 | int64_t pid_val; |
2c384610 DS |
553 | |
554 | virtual void handle_query_module() = 0; | |
555 | }; | |
556 | ||
2c384610 DS |
557 | struct dwarf_query : public base_query |
558 | { | |
e1278bd4 | 559 | dwarf_query(probe * base_probe, |
2c384610 DS |
560 | probe_point * base_loc, |
561 | dwflpp & dw, | |
86bf665e | 562 | literal_map_t const & params, |
b642c901 SC |
563 | vector<derived_probe *> & results, |
564 | const string user_path, | |
565 | const string user_lib); | |
2c384610 | 566 | |
c4ce66a1 | 567 | vector<derived_probe *> & results; |
8f14e444 | 568 | set<string> inlined_non_returnable; // function names |
c4ce66a1 JS |
569 | probe * base_probe; |
570 | probe_point * base_loc; | |
b642c901 SC |
571 | string user_path; |
572 | string user_lib; | |
c4ce66a1 | 573 | |
614f0fcf JL |
574 | set<string> visited_libraries; |
575 | bool resolved_library; | |
576 | ||
2c384610 | 577 | virtual void handle_query_module(); |
5f0a03a6 JK |
578 | void query_module_dwarf(); |
579 | void query_module_symtab(); | |
5d5bd369 | 580 | void query_library (const char *data); |
576eaefe | 581 | void query_plt (const char *entry, size_t addr); |
2c384610 | 582 | |
2930abc7 FCE |
583 | void add_probe_point(string const & funcname, |
584 | char const * filename, | |
585 | int line, | |
586 | Dwarf_Die *scope_die, | |
587 | Dwarf_Addr addr); | |
36f9dd1d | 588 | |
613c8675 JL |
589 | void mount_well_formed_probe_point(); |
590 | void unmount_well_formed_probe_point(); | |
591 | stack<pair<probe_point*, probe*> > previous_bases; | |
592 | ||
71dfce11 JL |
593 | void replace_probe_point_component_arg(const string& functor, |
594 | const string& new_functor, | |
595 | int64_t new_arg, | |
596 | bool hex = false); | |
597 | void replace_probe_point_component_arg(const string& functor, | |
598 | int64_t new_arg, | |
599 | bool hex = false); | |
600 | void replace_probe_point_component_arg(const string& functor, | |
601 | const string& new_functor, | |
602 | const string& new_arg); | |
603 | void replace_probe_point_component_arg(const string& functor, | |
604 | const string& new_arg); | |
605 | void remove_probe_point_component(const string& functor); | |
606 | ||
857bdfd1 JS |
607 | // Track addresses we've already seen in a given module |
608 | set<Dwarf_Addr> alias_dupes; | |
609 | ||
7fdd3e2c JS |
610 | // Track inlines we've already seen as well |
611 | // NB: this can't be compared just by entrypc, as inlines can overlap | |
612 | set<inline_instance_info> inline_dupes; | |
613 | ||
e2941743 JL |
614 | // Used in .callee[s] probes, when calling iterate_over_callees() (which |
615 | // provides the actual stack). Retains the addrs of the callers unwind addr | |
616 | // where the callee is found. Specifies multiple callers. E.g. when a callee | |
617 | // at depth 2 is found, callers[1] has the addr of the caller, and callers[0] | |
618 | // has the addr of the caller's caller. | |
619 | stack<Dwarf_Addr> *callers; | |
620 | ||
20c6c071 GH |
621 | bool has_function_str; |
622 | bool has_statement_str; | |
623 | bool has_function_num; | |
624 | bool has_statement_num; | |
7a053d3b RM |
625 | string statement_str_val; |
626 | string function_str_val; | |
c239d28c GH |
627 | Dwarf_Addr statement_num_val; |
628 | Dwarf_Addr function_num_val; | |
20c6c071 | 629 | |
b8da0ad1 | 630 | bool has_call; |
4bda987e | 631 | bool has_exported; |
b8da0ad1 | 632 | bool has_inline; |
20c6c071 GH |
633 | bool has_return; |
634 | ||
c9bad430 DS |
635 | bool has_maxactive; |
636 | long maxactive_val; | |
637 | ||
20c6c071 GH |
638 | bool has_label; |
639 | string label_val; | |
640 | ||
c31add50 JL |
641 | bool has_callee; |
642 | string callee_val; | |
643 | ||
644 | bool has_callees_num; | |
645 | long callees_num_val; | |
646 | ||
20c6c071 GH |
647 | bool has_relative; |
648 | long relative_val; | |
649 | ||
37ebca01 FCE |
650 | bool has_absolute; |
651 | ||
467bea43 SC |
652 | bool has_mark; |
653 | ||
5f0a03a6 JK |
654 | enum dbinfo_reqt dbinfo_reqt; |
655 | enum dbinfo_reqt assess_dbinfo_reqt(); | |
656 | ||
7d6d0afc | 657 | void parse_function_spec(const string & spec); |
20c6c071 | 658 | function_spec_type spec_type; |
7d6d0afc | 659 | vector<string> scopes; |
20c6c071 GH |
660 | string function; |
661 | string file; | |
4a81c0d9 | 662 | lineno_t lineno_type; |
f01d4ffb | 663 | vector<int> linenos; |
5f0a03a6 | 664 | bool query_done; // Found exact match |
20c6c071 | 665 | |
5a617dc6 JL |
666 | // Holds the prologue end of the current function |
667 | Dwarf_Addr prologue_end; | |
668 | ||
bd25380d | 669 | set<string> filtered_srcfiles; |
7e1279ea FCE |
670 | |
671 | // Map official entrypc -> func_info object | |
86bf665e TM |
672 | inline_instance_map_t filtered_inlines; |
673 | func_info_map_t filtered_functions; | |
4df79aaf | 674 | |
959ccfed JL |
675 | // Helper when we want to iterate over both |
676 | base_func_info_map_t filtered_all(); | |
677 | ||
4df79aaf | 678 | void query_module_functions (); |
e772a6e7 JL |
679 | |
680 | string final_function_name(const string& final_func, | |
79954c0f | 681 | const char* final_file, |
e772a6e7 | 682 | int final_line); |
b55bc428 FCE |
683 | }; |
684 | ||
37635b45 AJ |
685 | struct uprobe_derived_probe: public dwarf_derived_probe |
686 | { | |
687 | int pid; // 0 => unrestricted | |
688 | ||
689 | uprobe_derived_probe (const string& function, | |
690 | const string& filename, | |
691 | int line, | |
692 | const string& module, | |
693 | const string& section, | |
694 | Dwarf_Addr dwfl_addr, | |
695 | Dwarf_Addr addr, | |
696 | dwarf_query & q, | |
697 | Dwarf_Die* scope_die): | |
698 | dwarf_derived_probe(function, filename, line, module, section, | |
c88bcbe8 | 699 | dwfl_addr, addr, q, scope_die), pid(q.pid_val) |
37635b45 AJ |
700 | {} |
701 | ||
702 | // alternate constructor for process(PID).statement(ADDR).absolute | |
703 | uprobe_derived_probe (probe *base, | |
704 | probe_point *location, | |
705 | int pid, | |
706 | Dwarf_Addr addr, | |
707 | bool has_return): | |
708 | dwarf_derived_probe(base, location, addr, has_return), pid(pid) | |
709 | {} | |
710 | ||
711 | void join_group (systemtap_session& s); | |
712 | ||
713 | void emit_privilege_assertion (translator_output*); | |
714 | void print_dupe_stamp(ostream& o) { print_dupe_stamp_unprivileged_process_owner (o); } | |
715 | void getargs(std::list<std::string> &arg_set) const; | |
716 | void saveargs(int nargs); | |
717 | private: | |
718 | list<string> args; | |
719 | }; | |
720 | ||
721 | struct dwarf_derived_probe_group: public derived_probe_group | |
722 | { | |
723 | private: | |
724 | multimap<string,dwarf_derived_probe*> probes_by_module; | |
725 | typedef multimap<string,dwarf_derived_probe*>::iterator p_b_m_iterator; | |
726 | ||
727 | public: | |
728 | dwarf_derived_probe_group() {} | |
729 | void enroll (dwarf_derived_probe* probe); | |
730 | void emit_module_decls (systemtap_session& s); | |
731 | void emit_module_init (systemtap_session& s); | |
732 | void emit_module_refresh (systemtap_session& s); | |
733 | void emit_module_exit (systemtap_session& s); | |
734 | }; | |
735 | ||
736 | base_query::base_query(dwflpp & dw, literal_map_t const & params): | |
c88bcbe8 AJ |
737 | sess(dw.sess), dw(dw), has_library(false), has_plt(false), has_statement(false), |
738 | pid_val(0) | |
37635b45 AJ |
739 | { |
740 | has_kernel = has_null_param (params, TOK_KERNEL); | |
741 | if (has_kernel) | |
742 | module_val = "kernel"; | |
743 | ||
744 | has_module = get_string_param (params, TOK_MODULE, module_val); | |
745 | if (has_module) | |
746 | has_process = false; | |
747 | else | |
748 | { | |
749 | string library_name; | |
750 | long statement_num_val; | |
751 | has_process = derived_probe_builder::has_param(params, TOK_PROCESS); | |
752 | has_library = get_string_param (params, TOK_LIBRARY, library_name); | |
753 | if ((has_plt = has_null_param (params, TOK_PLT))) | |
754 | plt_val = "*"; | |
755 | else has_plt = get_string_param (params, TOK_PLT, plt_val); | |
756 | has_statement = get_number_param(params, TOK_STATEMENT, statement_num_val); | |
757 | ||
758 | if (has_process) | |
759 | { | |
c88bcbe8 | 760 | if (get_number_param(params, TOK_PROCESS, pid_val)) |
37635b45 AJ |
761 | { |
762 | // check that the pid given corresponds to a running process | |
c88bcbe8 | 763 | if (pid_val < 1 || kill(pid_val, 0) == -1) |
37635b45 AJ |
764 | switch (errno) // ignore EINVAL: invalid signal |
765 | { | |
766 | case ESRCH: | |
767 | throw SEMANTIC_ERROR(_("pid given does not correspond to a running process")); | |
768 | case EPERM: | |
769 | throw SEMANTIC_ERROR(_("invalid permissions for signalling given pid")); | |
770 | default: | |
771 | throw SEMANTIC_ERROR(_("invalid pid")); | |
772 | } | |
c88bcbe8 | 773 | string pid_path = string("/proc/") + lex_cast(pid_val) + "/exe"; |
37635b45 AJ |
774 | module_val = sess.sysroot + pid_path; |
775 | } | |
c88bcbe8 AJ |
776 | else |
777 | { | |
778 | // reset the pid_val in case anything weird got written into it | |
779 | pid_val = 0; | |
37635b45 | 780 | get_string_param(params, TOK_PROCESS, module_val); |
c88bcbe8 | 781 | } |
37635b45 AJ |
782 | module_val = find_executable (module_val, sess.sysroot, sess.sysenv); |
783 | if (!is_fully_resolved(module_val, sess.sysroot, sess.sysenv)) | |
784 | throw SEMANTIC_ERROR(_F("cannot find executable '%s'", | |
785 | module_val.c_str())); | |
786 | } | |
787 | ||
788 | // Library probe? Let's target that instead if it is fully resolved (such | |
789 | // as what query_one_library() would have done for us). Otherwise, we | |
790 | // resort to iterate_over_libraries(). | |
791 | if (has_library && is_fully_resolved(library_name, sess.sysroot, sess.sysenv, | |
792 | "LD_LIBRARY_PATH")) | |
793 | { | |
794 | path = path_remove_sysroot(sess, module_val); | |
795 | module_val = library_name; | |
796 | } | |
797 | } | |
798 | ||
799 | assert (has_kernel || has_process || has_module); | |
800 | } | |
801 | ||
802 | base_query::base_query(dwflpp & dw, const string & module_val) | |
803 | : sess(dw.sess), dw(dw), has_library(false), has_plt(false), has_statement(false), | |
c88bcbe8 | 804 | module_val(module_val), pid_val(0) |
37635b45 AJ |
805 | { |
806 | // NB: This uses '/' to distinguish between kernel modules and userspace, | |
807 | // which means that userspace modules won't get any PATH searching. | |
808 | if (module_val.find('/') == string::npos) | |
809 | { | |
810 | has_kernel = (module_val == TOK_KERNEL); | |
811 | has_module = !has_kernel; | |
812 | has_process = false; | |
813 | } | |
814 | else | |
815 | { | |
816 | has_kernel = has_module = false; | |
817 | has_process = true; | |
818 | } | |
819 | } | |
820 | ||
821 | bool | |
822 | base_query::has_null_param(literal_map_t const & params, | |
823 | string const & k) | |
824 | { | |
825 | return derived_probe_builder::has_null_param(params, k); | |
826 | } | |
827 | ||
828 | ||
829 | bool | |
830 | base_query::get_string_param(literal_map_t const & params, | |
831 | string const & k, string & v) | |
832 | { | |
833 | return derived_probe_builder::get_param (params, k, v); | |
834 | } | |
835 | ||
836 | ||
837 | bool | |
838 | base_query::get_number_param(literal_map_t const & params, | |
839 | string const & k, long & v) | |
840 | { | |
841 | int64_t value; | |
842 | bool present = derived_probe_builder::get_param (params, k, value); | |
843 | v = (long) value; | |
844 | return present; | |
845 | } | |
846 | ||
847 | ||
848 | bool | |
849 | base_query::get_number_param(literal_map_t const & params, | |
850 | string const & k, Dwarf_Addr & v) | |
851 | { | |
852 | int64_t value; | |
853 | bool present = derived_probe_builder::get_param (params, k, value); | |
854 | v = (Dwarf_Addr) value; | |
855 | return present; | |
856 | } | |
98afd80e | 857 | |
435f53a7 FCE |
858 | static void delete_session_module_cache (systemtap_session& s); // forward decl |
859 | ||
860 | ||
98afd80e | 861 | struct dwarf_builder: public derived_probe_builder |
b55bc428 | 862 | { |
665e1256 | 863 | map <string,dwflpp*> kern_dw; /* NB: key string could be a wildcard */ |
7a24d422 | 864 | map <string,dwflpp*> user_dw; |
b642c901 SC |
865 | string user_path; |
866 | string user_lib; | |
44ffe90c JL |
867 | |
868 | // Holds modules to suggest functions from. NB: aggregates over | |
869 | // recursive calls to build() when deriving globby probes. | |
870 | set <string> modules_seen; | |
871 | ||
ae2552da | 872 | dwarf_builder() {} |
aa30ccd3 | 873 | |
ae2552da | 874 | dwflpp *get_kern_dw(systemtap_session& sess, const string& module) |
707bf35e | 875 | { |
ea14cf67 FCE |
876 | if (kern_dw[module] == 0) |
877 | kern_dw[module] = new dwflpp(sess, module, true); // might throw | |
ae2552da | 878 | return kern_dw[module]; |
707bf35e JS |
879 | } |
880 | ||
881 | dwflpp *get_user_dw(systemtap_session& sess, const string& module) | |
882 | { | |
ea14cf67 FCE |
883 | if (user_dw[module] == 0) |
884 | user_dw[module] = new dwflpp(sess, module, false); // might throw | |
707bf35e JS |
885 | return user_dw[module]; |
886 | } | |
7a24d422 FCE |
887 | |
888 | /* NB: not virtual, so can be called from dtor too: */ | |
822a6a3d | 889 | void dwarf_build_no_more (bool) |
aa30ccd3 | 890 | { |
435f53a7 FCE |
891 | delete_map(kern_dw); |
892 | delete_map(user_dw); | |
7a24d422 FCE |
893 | } |
894 | ||
895 | void build_no_more (systemtap_session &s) | |
896 | { | |
897 | dwarf_build_no_more (s.verbose > 3); | |
435f53a7 | 898 | delete_session_module_cache (s); |
aa30ccd3 FCE |
899 | } |
900 | ||
e38d6504 RM |
901 | ~dwarf_builder() |
902 | { | |
7a24d422 | 903 | dwarf_build_no_more (false); |
c8959a29 | 904 | } |
aa30ccd3 | 905 | |
5227f1ea | 906 | virtual void build(systemtap_session & sess, |
7a053d3b | 907 | probe * base, |
20c6c071 | 908 | probe_point * location, |
86bf665e | 909 | literal_map_t const & parameters, |
20c6c071 | 910 | vector<derived_probe *> & finished_results); |
b55bc428 FCE |
911 | }; |
912 | ||
5111fc3e | 913 | |
e1278bd4 | 914 | dwarf_query::dwarf_query(probe * base_probe, |
20c6c071 GH |
915 | probe_point * base_loc, |
916 | dwflpp & dw, | |
86bf665e | 917 | literal_map_t const & params, |
b642c901 SC |
918 | vector<derived_probe *> & results, |
919 | const string user_path, | |
920 | const string user_lib) | |
e2941743 JL |
921 | : base_query(dw, params), results(results), base_probe(base_probe), |
922 | base_loc(base_loc), user_path(user_path), user_lib(user_lib), | |
614f0fcf JL |
923 | resolved_library(false), callers(NULL), has_relative(false), |
924 | relative_val(0), prologue_end(0) | |
bd2b1e68 GH |
925 | { |
926 | // Reduce the query to more reasonable semantic values (booleans, | |
927 | // extracted strings, numbers, etc). | |
bd2b1e68 GH |
928 | has_function_str = get_string_param(params, TOK_FUNCTION, function_str_val); |
929 | has_function_num = get_number_param(params, TOK_FUNCTION, function_num_val); | |
930 | ||
931 | has_statement_str = get_string_param(params, TOK_STATEMENT, statement_str_val); | |
932 | has_statement_num = get_number_param(params, TOK_STATEMENT, statement_num_val); | |
933 | ||
0f336e95 | 934 | has_label = get_string_param(params, TOK_LABEL, label_val); |
c31add50 JL |
935 | has_callee = get_string_param(params, TOK_CALLEE, callee_val); |
936 | if (has_null_param(params, TOK_CALLEES)) | |
937 | { // .callees ==> .callees(1) (also equivalent to .callee("*")) | |
938 | has_callees_num = true; | |
939 | callees_num_val = 1; | |
940 | } | |
941 | else | |
942 | { | |
943 | has_callees_num = get_number_param(params, TOK_CALLEES, callees_num_val); | |
944 | if (has_callees_num && callees_num_val < 1) | |
945 | throw SEMANTIC_ERROR(_(".callees(N) only acceptable for N >= 1"), | |
946 | base_probe->tok); | |
947 | } | |
0f336e95 | 948 | |
b8da0ad1 | 949 | has_call = has_null_param(params, TOK_CALL); |
4bda987e | 950 | has_exported = has_null_param(params, TOK_EXPORTED); |
b8da0ad1 | 951 | has_inline = has_null_param(params, TOK_INLINE); |
bd2b1e68 | 952 | has_return = has_null_param(params, TOK_RETURN); |
c9bad430 | 953 | has_maxactive = get_number_param(params, TOK_MAXACTIVE, maxactive_val); |
37ebca01 | 954 | has_absolute = has_null_param(params, TOK_ABSOLUTE); |
467bea43 | 955 | has_mark = false; |
37ebca01 | 956 | |
bd2b1e68 | 957 | if (has_function_str) |
7d6d0afc | 958 | parse_function_spec(function_str_val); |
bd2b1e68 | 959 | else if (has_statement_str) |
7d6d0afc | 960 | parse_function_spec(statement_str_val); |
0daad364 | 961 | |
5f0a03a6 JK |
962 | dbinfo_reqt = assess_dbinfo_reqt(); |
963 | query_done = false; | |
0daad364 JS |
964 | } |
965 | ||
966 | ||
2c384610 | 967 | void |
5f0a03a6 | 968 | dwarf_query::query_module_dwarf() |
2c384610 DS |
969 | { |
970 | if (has_function_num || has_statement_num) | |
971 | { | |
972 | // If we have module("foo").function(0xbeef) or | |
973 | // module("foo").statement(0xbeef), the address is relative | |
974 | // to the start of the module, so we seek the function | |
975 | // number plus the module's bias. | |
6b517475 JS |
976 | Dwarf_Addr addr = has_function_num ? |
977 | function_num_val : statement_num_val; | |
08d1d520 MW |
978 | |
979 | // These are raw addresses, we need to know what the elf_bias | |
980 | // is to feed it to libdwfl based functions. | |
981 | Dwarf_Addr elf_bias; | |
982 | Elf *elf = dwfl_module_getelf (dw.module, &elf_bias); | |
983 | assert(elf); | |
984 | addr += elf_bias; | |
6b517475 | 985 | query_addr(addr, this); |
2c384610 DS |
986 | } |
987 | else | |
988 | { | |
989 | // Otherwise if we have a function("foo") or statement("foo") | |
990 | // specifier, we have to scan over all the CUs looking for | |
991 | // the function(s) in question | |
992 | assert(has_function_str || has_statement_str); | |
4df79aaf JS |
993 | |
994 | // For simple cases, no wildcard and no source:line, we can do a very | |
995 | // quick function lookup in a module-wide cache. | |
1ffb8bd1 JS |
996 | if (spec_type == function_alone && |
997 | !dw.name_has_wildcard(function) && | |
998 | !startswith(function, "_Z")) | |
4df79aaf JS |
999 | query_module_functions(); |
1000 | else | |
337b7c44 | 1001 | dw.iterate_over_cus(&query_cu, this, false); |
2c384610 DS |
1002 | } |
1003 | } | |
1004 | ||
5f0a03a6 JK |
1005 | static void query_func_info (Dwarf_Addr entrypc, func_info & fi, |
1006 | dwarf_query * q); | |
1007 | ||
91bb9081 LB |
1008 | static void |
1009 | query_symtab_func_info (func_info & fi, dwarf_query * q) | |
1010 | { | |
1011 | assert(null_die(&fi.die)); | |
1012 | ||
1013 | Dwarf_Addr addr = fi.addr; | |
1014 | ||
1015 | // Now compensate for the dw bias because the addresses come | |
1016 | // from dwfl_module_symtab, so fi->addr is NOT a normal dw address. | |
1017 | q->dw.get_module_dwarf(false, false); | |
1018 | addr -= q->dw.module_bias; | |
1019 | ||
1020 | // If there are already probes in this module, lets not duplicate. | |
1021 | // This can come from other weak symbols/aliases or existing | |
a41f2ad7 JS |
1022 | // matches from Dwarf DIE functions. Try to add this addr to the |
1023 | // collection, and only continue if it was new. | |
1024 | if (q->alias_dupes.insert(addr).second) | |
1025 | query_func_info(addr, fi, q); | |
91bb9081 LB |
1026 | } |
1027 | ||
5f0a03a6 JK |
1028 | void |
1029 | dwarf_query::query_module_symtab() | |
1030 | { | |
1031 | // Get the symbol table if it's necessary, sufficient, and not already got. | |
1032 | if (dbinfo_reqt == dbr_need_dwarf) | |
1033 | return; | |
1034 | ||
1035 | module_info *mi = dw.mod_info; | |
1036 | if (dbinfo_reqt == dbr_need_symtab) | |
1037 | { | |
1038 | if (mi->symtab_status == info_unknown) | |
5f52fafe | 1039 | mi->get_symtab(); |
5f0a03a6 JK |
1040 | if (mi->symtab_status == info_absent) |
1041 | return; | |
1042 | } | |
1043 | ||
1044 | func_info *fi = NULL; | |
1045 | symbol_table *sym_table = mi->sym_table; | |
1046 | ||
1047 | if (has_function_str) | |
1048 | { | |
1049 | // Per dwarf_query::assess_dbinfo_reqt()... | |
1050 | assert(spec_type == function_alone); | |
1051 | if (dw.name_has_wildcard(function_str_val)) | |
1052 | { | |
2e67a43b | 1053 | symbol_table::iterator_t iter; |
1c6b77e5 JS |
1054 | for (iter = sym_table->map_by_addr.begin(); |
1055 | iter != sym_table->map_by_addr.end(); | |
2e67a43b | 1056 | ++iter) |
5f0a03a6 | 1057 | { |
1c6b77e5 | 1058 | fi = iter->second; |
5f0a03a6 JK |
1059 | if (!null_die(&fi->die)) |
1060 | continue; // already handled in query_module_dwarf() | |
1061 | if (dw.function_name_matches_pattern(fi->name, function_str_val)) | |
91bb9081 | 1062 | query_symtab_func_info(*fi, this); |
5f0a03a6 JK |
1063 | } |
1064 | } | |
1065 | else | |
1066 | { | |
1067 | fi = sym_table->lookup_symbol(function_str_val); | |
2867a2a1 | 1068 | if (fi && !fi->descriptor && null_die(&fi->die)) |
91bb9081 | 1069 | query_symtab_func_info(*fi, this); |
5f0a03a6 | 1070 | } |
5f0a03a6 JK |
1071 | } |
1072 | } | |
1073 | ||
1074 | void | |
1075 | dwarf_query::handle_query_module() | |
1076 | { | |
f4faaf86 JS |
1077 | if (has_plt && has_statement_num) |
1078 | { | |
1079 | query_plt_statement (this); | |
1080 | return; | |
1081 | } | |
1082 | ||
0035051e | 1083 | bool report = dbinfo_reqt == dbr_need_dwarf; |
1c6b77e5 JS |
1084 | dw.get_module_dwarf(false, report); |
1085 | ||
1086 | // prebuild the symbol table to resolve aliases | |
5f52fafe | 1087 | dw.mod_info->get_symtab(); |
1c6b77e5 | 1088 | |
857bdfd1 JS |
1089 | // reset the dupe-checking for each new module |
1090 | alias_dupes.clear(); | |
7fdd3e2c | 1091 | inline_dupes.clear(); |
857bdfd1 | 1092 | |
5f0a03a6 JK |
1093 | if (dw.mod_info->dwarf_status == info_present) |
1094 | query_module_dwarf(); | |
1c6b77e5 | 1095 | |
91bb9081 LB |
1096 | // Consult the symbol table, asm and weak functions can show up |
1097 | // in the symbol table but not in dwarf and minidebuginfo is | |
1098 | // located in the gnu_debugdata section, alias_dupes checking | |
1099 | // is done before adding any probe points | |
1100 | if (!query_done && !pending_interrupts) | |
5f0a03a6 JK |
1101 | query_module_symtab(); |
1102 | } | |
1103 | ||
2c384610 | 1104 | |
7d6d0afc JS |
1105 | void |
1106 | dwarf_query::parse_function_spec(const string & spec) | |
bd2b1e68 | 1107 | { |
4a81c0d9 | 1108 | lineno_type = ABSOLUTE; |
f01d4ffb | 1109 | size_t src_pos, line_pos, scope_pos; |
bd2b1e68 | 1110 | |
7d6d0afc | 1111 | // look for named scopes |
91699a70 JS |
1112 | scope_pos = spec.rfind("::"); |
1113 | if (scope_pos != string::npos) | |
bd2b1e68 | 1114 | { |
91699a70 JS |
1115 | tokenize_cxx(spec.substr(0, scope_pos), scopes); |
1116 | scope_pos += 2; | |
bd2b1e68 | 1117 | } |
91699a70 JS |
1118 | else |
1119 | scope_pos = 0; | |
bd2b1e68 | 1120 | |
7d6d0afc JS |
1121 | // look for a source separator |
1122 | src_pos = spec.find('@', scope_pos); | |
1123 | if (src_pos == string::npos) | |
bd2b1e68 | 1124 | { |
7d6d0afc JS |
1125 | function = spec.substr(scope_pos); |
1126 | spec_type = function_alone; | |
bd2b1e68 | 1127 | } |
7d6d0afc | 1128 | else |
879eb9e9 | 1129 | { |
7d6d0afc | 1130 | function = spec.substr(scope_pos, src_pos - scope_pos); |
7a053d3b | 1131 | |
7d6d0afc JS |
1132 | // look for a line-number separator |
1133 | line_pos = spec.find_first_of(":+", src_pos); | |
1134 | if (line_pos == string::npos) | |
1135 | { | |
1136 | file = spec.substr(src_pos + 1); | |
1137 | spec_type = function_and_file; | |
1138 | } | |
1139 | else | |
1140 | { | |
1141 | file = spec.substr(src_pos + 1, line_pos - src_pos - 1); | |
1142 | ||
1143 | // classify the line spec | |
1144 | spec_type = function_file_and_line; | |
1145 | if (spec[line_pos] == '+') | |
4a81c0d9 | 1146 | lineno_type = RELATIVE; |
7d6d0afc JS |
1147 | else if (spec[line_pos + 1] == '*' && |
1148 | spec.length() == line_pos + 2) | |
4a81c0d9 | 1149 | lineno_type = WILDCARD; |
7d6d0afc | 1150 | else |
4a81c0d9 | 1151 | lineno_type = ABSOLUTE; |
7d6d0afc | 1152 | |
4a81c0d9 | 1153 | if (lineno_type != WILDCARD) |
7d6d0afc JS |
1154 | try |
1155 | { | |
f01d4ffb BC |
1156 | // try to parse N, N-M, or N,M,O,P, or combination thereof... |
1157 | if (spec.find_first_of(",-", line_pos + 1) != string::npos) | |
1158 | { | |
1159 | lineno_type = ENUMERATED; | |
1160 | vector<string> sub_specs; | |
1161 | tokenize(spec.substr(line_pos + 1), sub_specs, ","); | |
1162 | vector<string>::const_iterator line_spec; | |
1163 | for (line_spec = sub_specs.begin(); line_spec != sub_specs.end(); ++line_spec) | |
1164 | { | |
1165 | vector<string> ranges; | |
1166 | tokenize(*line_spec, ranges, "-"); | |
1167 | if (ranges.size() > 1) | |
1168 | for (int i = lex_cast<int>(ranges.front()); i <= lex_cast<int>(ranges.back()); i++) | |
1169 | linenos.push_back(i); | |
1170 | else | |
1171 | linenos.push_back(lex_cast<int>(ranges.at(0))); | |
1172 | } | |
1173 | sort(linenos.begin(), linenos.end()); | |
1174 | } | |
7d6d0afc JS |
1175 | else |
1176 | { | |
f01d4ffb BC |
1177 | linenos.push_back(lex_cast<int>(spec.substr(line_pos + 1))); |
1178 | linenos.push_back(lex_cast<int>(spec.substr(line_pos + 1))); | |
7d6d0afc JS |
1179 | } |
1180 | } | |
1181 | catch (runtime_error & exn) | |
1182 | { | |
1183 | goto bad; | |
1184 | } | |
1185 | } | |
bd2b1e68 GH |
1186 | } |
1187 | ||
7d6d0afc JS |
1188 | if (function.empty() || |
1189 | (spec_type != function_alone && file.empty())) | |
bd2b1e68 GH |
1190 | goto bad; |
1191 | ||
7d6d0afc | 1192 | if (sess.verbose > 2) |
bd2b1e68 | 1193 | { |
b530b5b3 LB |
1194 | //clog << "parsed '" << spec << "'"; |
1195 | clog << _F("parse '%s'", spec.c_str()); | |
41c262f3 | 1196 | |
7d6d0afc JS |
1197 | if (!scopes.empty()) |
1198 | clog << ", scope '" << scopes[0] << "'"; | |
1199 | for (unsigned i = 1; i < scopes.size(); ++i) | |
1200 | clog << "::'" << scopes[i] << "'"; | |
41c262f3 | 1201 | |
7d6d0afc JS |
1202 | clog << ", func '" << function << "'"; |
1203 | ||
1204 | if (spec_type != function_alone) | |
1205 | clog << ", file '" << file << "'"; | |
1206 | ||
1207 | if (spec_type == function_file_and_line) | |
1208 | { | |
1209 | clog << ", line "; | |
4a81c0d9 | 1210 | switch (lineno_type) |
7d6d0afc JS |
1211 | { |
1212 | case ABSOLUTE: | |
4a81c0d9 | 1213 | clog << linenos[0]; |
7d6d0afc JS |
1214 | break; |
1215 | ||
1216 | case RELATIVE: | |
4a81c0d9 | 1217 | clog << "+" << linenos[0]; |
7d6d0afc JS |
1218 | break; |
1219 | ||
f01d4ffb BC |
1220 | case ENUMERATED: |
1221 | { | |
10e6fe03 | 1222 | vector<int>::const_iterator linenos_it; |
f01d4ffb BC |
1223 | for (linenos_it = linenos.begin(); linenos_it != linenos.end(); ++linenos_it) |
1224 | { | |
1225 | vector<int>::const_iterator range_it(linenos_it); | |
1226 | while ((range_it+1) != linenos.end() && *range_it + 1 == *(range_it+1)) | |
1227 | ++range_it; | |
1228 | if (linenos_it == range_it) | |
1229 | clog << *linenos_it; | |
1230 | else | |
1231 | clog << *linenos_it << "-" << *range_it; | |
1232 | if (range_it + 1 != linenos.end()) | |
1233 | clog << ","; | |
1234 | linenos_it = range_it; | |
1235 | } | |
1236 | } | |
7d6d0afc JS |
1237 | break; |
1238 | ||
1239 | case WILDCARD: | |
1240 | clog << "*"; | |
1241 | break; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | clog << endl; | |
bd2b1e68 GH |
1246 | } |
1247 | ||
7d6d0afc JS |
1248 | return; |
1249 | ||
1250 | bad: | |
dc09353a | 1251 | throw SEMANTIC_ERROR(_F("malformed specification '%s'", spec.c_str()), |
7d6d0afc | 1252 | base_probe->tok); |
bd2b1e68 GH |
1253 | } |
1254 | ||
05fb3e0c WF |
1255 | string path_remove_sysroot(const systemtap_session& sess, const string& path) |
1256 | { | |
1257 | size_t pos; | |
1258 | string retval = path; | |
1259 | if (!sess.sysroot.empty() && | |
1260 | (pos = retval.find(sess.sysroot)) != string::npos) | |
1261 | retval.replace(pos, sess.sysroot.length(), "/"); | |
1262 | return retval; | |
1263 | } | |
bd2b1e68 | 1264 | |
36f9dd1d | 1265 | void |
1ffb8bd1 | 1266 | dwarf_query::add_probe_point(const string& dw_funcname, |
b20febf3 | 1267 | const char* filename, |
36f9dd1d | 1268 | int line, |
b20febf3 | 1269 | Dwarf_Die* scope_die, |
36f9dd1d FCE |
1270 | Dwarf_Addr addr) |
1271 | { | |
b20febf3 | 1272 | string reloc_section; // base section for relocation purposes |
27646582 | 1273 | Dwarf_Addr reloc_addr; // relocated |
b20febf3 | 1274 | const string& module = dw.module_name; // "kernel" or other |
1ffb8bd1 | 1275 | string funcname = dw_funcname; |
36f9dd1d | 1276 | |
37ebca01 FCE |
1277 | assert (! has_absolute); // already handled in dwarf_builder::build() |
1278 | ||
f4faaf86 | 1279 | reloc_addr = dw.relocate_address(addr, reloc_section); |
2930abc7 | 1280 | |
1ffb8bd1 | 1281 | // If we originally used the linkage name, then let's call it that way |
1ffb8bd1 | 1282 | const char* linkage_name; |
91bb9081 | 1283 | if (!null_die(scope_die) && startswith (this->function, "_Z") |
f450a7e3 | 1284 | && (linkage_name = dwarf_linkage_name (scope_die))) |
1ffb8bd1 JS |
1285 | funcname = linkage_name; |
1286 | ||
7f9f3386 FCE |
1287 | if (sess.verbose > 1) |
1288 | { | |
b530b5b3 | 1289 | clog << _("probe ") << funcname << "@" << filename << ":" << line; |
b20febf3 | 1290 | if (string(module) == TOK_KERNEL) |
b530b5b3 | 1291 | clog << _(" kernel"); |
91af0778 | 1292 | else if (has_module) |
b530b5b3 | 1293 | clog << _(" module=") << module; |
91af0778 | 1294 | else if (has_process) |
b530b5b3 | 1295 | clog << _(" process=") << module; |
b20febf3 | 1296 | if (reloc_section != "") clog << " reloc=" << reloc_section; |
b20febf3 | 1297 | clog << " pc=0x" << hex << addr << dec; |
7f9f3386 | 1298 | } |
4baf0e53 | 1299 | |
2f18e69b JL |
1300 | dwflpp::blacklisted_type blacklisted = dw.blacklisted_p (funcname, filename, |
1301 | line, module, addr, | |
1302 | has_return); | |
b20febf3 FCE |
1303 | if (sess.verbose > 1) |
1304 | clog << endl; | |
7f9f3386 | 1305 | |
84048984 FCE |
1306 | if (module == TOK_KERNEL) |
1307 | { | |
1308 | // PR 4224: adapt to relocatable kernel by subtracting the _stext address here. | |
1309 | reloc_addr = addr - sess.sym_stext; | |
37ebca01 | 1310 | reloc_section = "_stext"; // a message to runtime's _stp_module_relocate |
84048984 FCE |
1311 | } |
1312 | ||
2f18e69b | 1313 | if (!blacklisted) |
b20febf3 | 1314 | { |
1a0dbc5a | 1315 | sess.unwindsym_modules.insert (module); |
6d0f3f0c FCE |
1316 | |
1317 | if (has_process) | |
1318 | { | |
05fb3e0c | 1319 | string module_tgt = path_remove_sysroot(sess, module); |
6d0f3f0c | 1320 | results.push_back (new uprobe_derived_probe(funcname, filename, line, |
05fb3e0c | 1321 | module_tgt, reloc_section, addr, reloc_addr, |
6d0f3f0c FCE |
1322 | *this, scope_die)); |
1323 | } | |
1324 | else | |
1325 | { | |
1326 | assert (has_kernel || has_module); | |
1327 | results.push_back (new dwarf_derived_probe(funcname, filename, line, | |
06aca46a | 1328 | module, reloc_section, addr, reloc_addr, |
6d0f3f0c FCE |
1329 | *this, scope_die)); |
1330 | } | |
b20febf3 | 1331 | } |
2f18e69b JL |
1332 | else |
1333 | { | |
1334 | switch (blacklisted) | |
1335 | { | |
1336 | case dwflpp::blacklisted_section: | |
1337 | sess.print_warning(_F("function %s is in blacklisted section", | |
1338 | funcname.c_str()), base_probe->tok); | |
1339 | break; | |
1340 | case dwflpp::blacklisted_kprobes: | |
1341 | sess.print_warning(_F("kprobes function %s is blacklisted", | |
1342 | funcname.c_str()), base_probe->tok); | |
1343 | break; | |
1344 | case dwflpp::blacklisted_function_return: | |
1345 | sess.print_warning(_F("function %s return probe is blacklisted", | |
1346 | funcname.c_str()), base_probe->tok); | |
1347 | break; | |
1348 | case dwflpp::blacklisted_file: | |
1349 | sess.print_warning(_F("function %s is in blacklisted file", | |
1350 | funcname.c_str()), base_probe->tok); | |
1351 | break; | |
1352 | case dwflpp::blacklisted_function: | |
1353 | default: | |
1354 | sess.print_warning(_F("function %s is blacklisted", | |
1355 | funcname.c_str()), base_probe->tok); | |
1356 | break; | |
1357 | } | |
1358 | } | |
2930abc7 FCE |
1359 | } |
1360 | ||
613c8675 JL |
1361 | void |
1362 | dwarf_query::mount_well_formed_probe_point() | |
1363 | { | |
1364 | string module = dw.module_name; | |
1365 | if (has_process) | |
1366 | module = path_remove_sysroot(sess, module); | |
1367 | ||
1368 | vector<probe_point::component*> comps; | |
1369 | vector<probe_point::component*>::iterator it; | |
1370 | for (it = base_loc->components.begin(); | |
1371 | it != base_loc->components.end(); ++it) | |
1372 | { | |
1373 | if ((*it)->functor == TOK_PROCESS || (*it)->functor == TOK_MODULE) | |
1374 | comps.push_back(new probe_point::component((*it)->functor, | |
1375 | new literal_string(has_library ? path : module))); | |
1376 | else | |
1377 | comps.push_back(*it); | |
1378 | } | |
1379 | ||
1380 | probe_point *pp = new probe_point(*base_loc); | |
1381 | pp->well_formed = true; | |
1382 | pp->components = comps; | |
1383 | ||
1384 | previous_bases.push(make_pair(base_loc, base_probe)); | |
1385 | ||
1386 | base_loc = pp; | |
1387 | base_probe = new probe(base_probe, pp); | |
1388 | } | |
1389 | ||
1390 | void | |
1391 | dwarf_query::unmount_well_formed_probe_point() | |
1392 | { | |
1393 | assert(!previous_bases.empty()); | |
1394 | ||
1395 | base_loc = previous_bases.top().first; | |
1396 | base_probe = previous_bases.top().second; | |
1397 | ||
1398 | previous_bases.pop(); | |
1399 | } | |
1400 | ||
71dfce11 JL |
1401 | void |
1402 | dwarf_query::replace_probe_point_component_arg(const string& functor, | |
1403 | const string& new_functor, | |
1404 | int64_t new_arg, | |
1405 | bool hex) | |
1406 | { | |
1407 | // only allow these operations if we're editing the well-formed loc | |
1408 | assert(!previous_bases.empty()); | |
1409 | ||
1410 | vector<probe_point::component*>::iterator it; | |
1411 | for (it = base_loc->components.begin(); | |
1412 | it != base_loc->components.end(); ++it) | |
1413 | if ((*it)->functor == functor) | |
1414 | *it = new probe_point::component(new_functor, | |
1415 | new literal_number(new_arg, hex)); | |
1416 | } | |
1417 | ||
1418 | void | |
1419 | dwarf_query::replace_probe_point_component_arg(const string& functor, | |
1420 | int64_t new_arg, | |
1421 | bool hex) | |
1422 | { | |
1423 | replace_probe_point_component_arg(functor, functor, new_arg, hex); | |
1424 | } | |
1425 | ||
1426 | void | |
1427 | dwarf_query::replace_probe_point_component_arg(const string& functor, | |
1428 | const string& new_functor, | |
1429 | const string& new_arg) | |
1430 | { | |
1431 | // only allow these operations if we're editing the well-formed loc | |
1432 | assert(!previous_bases.empty()); | |
1433 | ||
1434 | vector<probe_point::component*>::iterator it; | |
1435 | for (it = base_loc->components.begin(); | |
1436 | it != base_loc->components.end(); ++it) | |
1437 | if ((*it)->functor == functor) | |
1438 | *it = new probe_point::component(new_functor, | |
1439 | new literal_string(new_arg)); | |
1440 | } | |
1441 | ||
1442 | void | |
1443 | dwarf_query::replace_probe_point_component_arg(const string& functor, | |
1444 | const string& new_arg) | |
1445 | { | |
1446 | replace_probe_point_component_arg(functor, functor, new_arg); | |
1447 | } | |
1448 | ||
1449 | void | |
1450 | dwarf_query::remove_probe_point_component(const string& functor) | |
1451 | { | |
1452 | // only allow these operations if we're editing the well-formed loc | |
1453 | assert(!previous_bases.empty()); | |
1454 | ||
1455 | vector<probe_point::component*> new_comps; | |
1456 | vector<probe_point::component*>::iterator it; | |
1457 | for (it = base_loc->components.begin(); | |
1458 | it != base_loc->components.end(); ++it) | |
1459 | if ((*it)->functor != functor) | |
1460 | new_comps.push_back(*it); | |
1461 | ||
1462 | base_loc->components = new_comps; | |
1463 | } | |
1464 | ||
5f0a03a6 JK |
1465 | enum dbinfo_reqt |
1466 | dwarf_query::assess_dbinfo_reqt() | |
1467 | { | |
1468 | if (has_absolute) | |
1469 | { | |
1470 | // kernel.statement(NUM).absolute | |
1471 | return dbr_none; | |
1472 | } | |
c31add50 | 1473 | if (has_inline || has_label || has_callee || has_callees_num) |
5f0a03a6 JK |
1474 | { |
1475 | // kernel.function("f").inline or module("m").function("f").inline | |
1476 | return dbr_need_dwarf; | |
1477 | } | |
1478 | if (has_function_str && spec_type == function_alone) | |
1479 | { | |
1480 | // kernel.function("f") or module("m").function("f") | |
1481 | return dbr_need_symtab; | |
1482 | } | |
1483 | if (has_statement_num) | |
1484 | { | |
1485 | // kernel.statement(NUM) or module("m").statement(NUM) | |
1486 | // Technically, all we need is the module offset (or _stext, for | |
1487 | // the kernel). But for that we need either the ELF file or (for | |
1488 | // _stext) the symbol table. In either case, the symbol table | |
1489 | // is available, and that allows us to map the NUM (address) | |
1490 | // to a function, which is goodness. | |
1491 | return dbr_need_symtab; | |
1492 | } | |
1493 | if (has_function_num) | |
1494 | { | |
1495 | // kernel.function(NUM) or module("m").function(NUM) | |
1496 | // Need the symbol table so we can back up from NUM to the | |
1497 | // start of the function. | |
1498 | return dbr_need_symtab; | |
1499 | } | |
1500 | // Symbol table tells us nothing about source files or line numbers. | |
1501 | return dbr_need_dwarf; | |
1502 | } | |
2930abc7 | 1503 | |
e772a6e7 JL |
1504 | string |
1505 | dwarf_query::final_function_name(const string& final_func, | |
79954c0f | 1506 | const char* final_file, |
e772a6e7 JL |
1507 | int final_line) |
1508 | { | |
1509 | string final_name = final_func; | |
79954c0f | 1510 | if (final_file && *final_file != '\0') |
e772a6e7 | 1511 | { |
79954c0f | 1512 | final_name += ("@" + string(final_file)); |
e772a6e7 JL |
1513 | if (final_line > 0) |
1514 | final_name += (":" + lex_cast(final_line)); | |
1515 | } | |
1516 | return final_name; | |
1517 | } | |
2930abc7 | 1518 | |
959ccfed JL |
1519 | base_func_info_map_t |
1520 | dwarf_query::filtered_all(void) | |
1521 | { | |
1522 | vector<base_func_info> r; | |
1523 | func_info_map_t::const_iterator f; | |
1524 | for (f = filtered_functions.begin(); | |
1525 | f != filtered_functions.end(); ++f) | |
1526 | r.push_back(*f); | |
1527 | inline_instance_map_t::const_iterator i; | |
1528 | for (i = filtered_inlines.begin(); | |
1529 | i != filtered_inlines.end(); ++i) | |
1530 | r.push_back(*i); | |
1531 | return r; | |
1532 | } | |
1533 | ||
b8da0ad1 FCE |
1534 | // The critical determining factor when interpreting a pattern |
1535 | // string is, perhaps surprisingly: "presence of a lineno". The | |
1536 | // presence of a lineno changes the search strategy completely. | |
1537 | // | |
1538 | // Compare the two cases: | |
1539 | // | |
1540 | // 1. {statement,function}(foo@file.c:lineno) | |
1541 | // - find the files matching file.c | |
1542 | // - in each file, find the functions matching foo | |
1543 | // - query the file for line records matching lineno | |
1544 | // - iterate over the line records, | |
1545 | // - and iterate over the functions, | |
1546 | // - if(haspc(function.DIE, line.addr)) | |
1547 | // - if looking for statements: probe(lineno.addr) | |
1548 | // - if looking for functions: probe(function.{entrypc,return,etc.}) | |
1549 | // | |
1550 | // 2. {statement,function}(foo@file.c) | |
1551 | // - find the files matching file.c | |
1552 | // - in each file, find the functions matching foo | |
1553 | // - probe(function.{entrypc,return,etc.}) | |
1554 | // | |
1555 | // Thus the first decision we make is based on the presence of a | |
1556 | // lineno, and we enter entirely different sets of callbacks | |
1557 | // depending on that decision. | |
1558 | // | |
1559 | // Note that the first case is a generalization fo the second, in that | |
1560 | // we could theoretically search through line records for matching | |
1561 | // file names (a "table scan" in rdbms lingo). Luckily, file names | |
1562 | // are already cached elsewhere, so we can do an "index scan" as an | |
1563 | // optimization. | |
7e1279ea | 1564 | |
bd2b1e68 | 1565 | static void |
4cd232e4 | 1566 | query_statement (string const & func, |
20e4a32c | 1567 | char const * file, |
4cd232e4 | 1568 | int line, |
bcc12710 | 1569 | Dwarf_Die *scope_die, |
20e4a32c | 1570 | Dwarf_Addr stmt_addr, |
4cd232e4 | 1571 | dwarf_query * q) |
bd2b1e68 | 1572 | { |
39bcd429 FCE |
1573 | try |
1574 | { | |
cee35f73 | 1575 | q->add_probe_point(func, file ? file : "", |
a9b2f3a5 | 1576 | line, scope_die, stmt_addr); |
39bcd429 FCE |
1577 | } |
1578 | catch (const semantic_error& e) | |
1579 | { | |
1580 | q->sess.print_error (e); | |
1581 | } | |
bd2b1e68 GH |
1582 | } |
1583 | ||
6b517475 JS |
1584 | static void |
1585 | query_addr(Dwarf_Addr addr, dwarf_query *q) | |
1586 | { | |
7a71819c JL |
1587 | assert(q->has_function_num || q->has_statement_num); |
1588 | ||
6b517475 JS |
1589 | dwflpp &dw = q->dw; |
1590 | ||
08d1d520 MW |
1591 | if (q->sess.verbose > 2) |
1592 | clog << "query_addr 0x" << hex << addr << dec << endl; | |
6b517475 JS |
1593 | |
1594 | // First pick which CU contains this address | |
1595 | Dwarf_Die* cudie = dw.query_cu_containing_address(addr); | |
1596 | if (!cudie) // address could be wildly out of range | |
1597 | return; | |
1598 | dw.focus_on_cu(cudie); | |
1599 | ||
1600 | // Now compensate for the dw bias | |
1601 | addr -= dw.module_bias; | |
1602 | ||
1603 | // Per PR5787, we look up the scope die even for | |
1604 | // statement_num's, for blacklist sensitivity and $var | |
1605 | // resolution purposes. | |
1606 | ||
1607 | // Find the scopes containing this address | |
1608 | vector<Dwarf_Die> scopes = dw.getscopes(addr); | |
1609 | if (scopes.empty()) | |
1610 | return; | |
1611 | ||
1612 | // Look for the innermost containing function | |
1613 | Dwarf_Die *fnscope = NULL; | |
1614 | for (size_t i = 0; i < scopes.size(); ++i) | |
1615 | { | |
1616 | int tag = dwarf_tag(&scopes[i]); | |
1617 | if ((tag == DW_TAG_subprogram && !q->has_inline) || | |
1618 | (tag == DW_TAG_inlined_subroutine && | |
4bda987e | 1619 | !q->has_call && !q->has_return && !q->has_exported)) |
6b517475 JS |
1620 | { |
1621 | fnscope = &scopes[i]; | |
1622 | break; | |
1623 | } | |
1624 | } | |
1625 | if (!fnscope) | |
1626 | return; | |
1627 | dw.focus_on_function(fnscope); | |
1628 | ||
1629 | Dwarf_Die *scope = q->has_function_num ? fnscope : &scopes[0]; | |
1630 | ||
1631 | const char *file = dwarf_decl_file(fnscope); | |
1632 | int line; | |
1633 | dwarf_decl_line(fnscope, &line); | |
1634 | ||
1635 | // Function probes should reset the addr to the function entry | |
1636 | // and possibly perform prologue searching | |
1637 | if (q->has_function_num) | |
1638 | { | |
1bbf3f90 JS |
1639 | if (!dw.die_entrypc(fnscope, &addr)) |
1640 | return; | |
6b517475 | 1641 | if (dwarf_tag(fnscope) == DW_TAG_subprogram && |
b5b9879f JL |
1642 | (q->sess.prologue_searching || |
1643 | (q->has_process && !q->dw.has_valid_locs()))) // PR 6871 && PR 6941 | |
6b517475 JS |
1644 | { |
1645 | func_info func; | |
1646 | func.die = *fnscope; | |
1647 | func.name = dw.function_name; | |
1648 | func.decl_file = file; | |
1649 | func.decl_line = line; | |
1650 | func.entrypc = addr; | |
1651 | ||
1652 | func_info_map_t funcs(1, func); | |
1653 | dw.resolve_prologue_endings (funcs); | |
5a617dc6 JL |
1654 | q->prologue_end = funcs[0].prologue_end; |
1655 | ||
1656 | // PR13200: if it's a .return probe, we need to emit a *retprobe based | |
1657 | // on the entrypc so here we only use prologue_end for non .return | |
1658 | // probes (note however that .return probes still take advantage of | |
1659 | // prologue_end: PR14436) | |
1660 | if (!q->has_return) | |
1661 | addr = funcs[0].prologue_end; | |
6b517475 JS |
1662 | } |
1663 | } | |
1664 | else | |
1665 | { | |
de797211 JL |
1666 | Dwarf_Line *address_line = dwarf_getsrc_die(cudie, addr); |
1667 | Dwarf_Addr address_line_addr = addr; | |
6b517475 JS |
1668 | if (address_line) |
1669 | { | |
bf5974d6 JL |
1670 | file = DWARF_LINESRC(address_line); |
1671 | line = DWARF_LINENO(address_line); | |
1672 | address_line_addr = DWARF_LINEADDR(address_line); | |
6b517475 JS |
1673 | } |
1674 | ||
1675 | // Verify that a raw address matches the beginning of a | |
1676 | // statement. This is a somewhat lame check that the address | |
1677 | // is at the start of an assembly instruction. Mark probes are in the | |
1678 | // middle of a macro and thus not strictly at a statement beginning. | |
1679 | // Guru mode may override this check. | |
de797211 | 1680 | if (!q->has_mark && (!address_line || address_line_addr != addr)) |
6b517475 JS |
1681 | { |
1682 | stringstream msg; | |
2a97f50b | 1683 | msg << _F("address %#" PRIx64 " does not match the beginning of a statement", |
b530b5b3 | 1684 | addr); |
6b517475 | 1685 | if (address_line) |
de797211 | 1686 | msg << _F(" (try %#" PRIx64 ")", address_line_addr); |
6b517475 | 1687 | else |
b530b5b3 LB |
1688 | msg << _F(" (no line info found for '%s', in module '%s')", |
1689 | dw.cu_name().c_str(), dw.module_name.c_str()); | |
6b517475 | 1690 | if (! q->sess.guru_mode) |
dc09353a | 1691 | throw SEMANTIC_ERROR(msg.str()); |
2713ea24 | 1692 | else |
6b517475 JS |
1693 | q->sess.print_warning(msg.str()); |
1694 | } | |
1695 | } | |
1696 | ||
7a71819c JL |
1697 | // We're ready to build a probe, but before, we need to create the final, |
1698 | // well-formed version of this location with all the components filled in | |
1699 | q->mount_well_formed_probe_point(); | |
1700 | q->replace_probe_point_component_arg(TOK_FUNCTION, addr, true /* hex */ ); | |
1701 | q->replace_probe_point_component_arg(TOK_STATEMENT, addr, true /* hex */ ); | |
1702 | ||
6b517475 JS |
1703 | // Build a probe at this point |
1704 | query_statement(dw.function_name, file, line, scope, addr, q); | |
7a71819c JL |
1705 | |
1706 | q->unmount_well_formed_probe_point(); | |
6b517475 JS |
1707 | } |
1708 | ||
f4faaf86 JS |
1709 | static void |
1710 | query_plt_statement(dwarf_query *q) | |
1711 | { | |
1712 | assert (q->has_plt && q->has_statement_num); | |
1713 | ||
1714 | Dwarf_Addr addr = q->statement_num_val; | |
1715 | if (q->sess.verbose > 2) | |
1716 | clog << "query_plt_statement 0x" << hex << addr << dec << endl; | |
1717 | ||
1718 | // First adjust the raw address to dwfl's elf bias. | |
1719 | Dwarf_Addr elf_bias; | |
1720 | Elf *elf = dwfl_module_getelf (q->dw.module, &elf_bias); | |
1721 | assert(elf); | |
1722 | addr += elf_bias; | |
1723 | ||
1724 | // Now compensate for the dw bias | |
1725 | q->dw.get_module_dwarf(false, false); | |
1726 | addr -= q->dw.module_bias; | |
1727 | ||
93b44c2a JL |
1728 | // Create the final well-formed probe point |
1729 | q->mount_well_formed_probe_point(); | |
1730 | q->replace_probe_point_component_arg(TOK_STATEMENT, q->statement_num_val, true /* hex */ ); | |
1731 | ||
1732 | // We remove the .plt part here, since if the user provided a .plt probe, then | |
1733 | // the higher-level probe point is already well-formed. On the other hand, if | |
1734 | // the user provides a .plt(PATTERN).statement(0xABCD), the PATTERN is | |
1735 | // irrelevant (we won't iterate over plts) so just take it out. | |
1736 | q->remove_probe_point_component(TOK_PLT); | |
1737 | ||
f4faaf86 JS |
1738 | // Build a probe at this point |
1739 | query_statement(q->plt_val, NULL, -1, NULL, addr, q); | |
93b44c2a JL |
1740 | |
1741 | q->unmount_well_formed_probe_point(); | |
f4faaf86 JS |
1742 | } |
1743 | ||
8096dd7d | 1744 | static void |
600d39f1 | 1745 | query_label (const base_func_info& func, |
8096dd7d JS |
1746 | char const * label, |
1747 | char const * file, | |
1748 | int line, | |
1749 | Dwarf_Die *scope_die, | |
1750 | Dwarf_Addr stmt_addr, | |
1751 | dwarf_query * q) | |
1752 | { | |
6b517475 JS |
1753 | assert (q->has_statement_str || q->has_function_str); |
1754 | ||
8096dd7d JS |
1755 | // weed out functions whose decl_file isn't one of |
1756 | // the source files that we actually care about | |
6b517475 | 1757 | if (q->spec_type != function_alone && |
8096dd7d JS |
1758 | q->filtered_srcfiles.count(file) == 0) |
1759 | return; | |
1760 | ||
cdabbe86 | 1761 | // Create the final well-formed probe |
600d39f1 | 1762 | string canon_func = q->final_function_name(func.name, file, line); |
9891c543 | 1763 | |
cdabbe86 JL |
1764 | q->mount_well_formed_probe_point(); |
1765 | q->replace_probe_point_component_arg(TOK_FUNCTION, canon_func); | |
1766 | q->replace_probe_point_component_arg(TOK_LABEL, label); | |
8096dd7d | 1767 | |
600d39f1 | 1768 | query_statement(func.name, file, line, scope_die, stmt_addr, q); |
9891c543 | 1769 | |
cdabbe86 | 1770 | q->unmount_well_formed_probe_point(); |
8096dd7d JS |
1771 | } |
1772 | ||
67959c62 | 1773 | static void |
e772a6e7 JL |
1774 | query_callee (base_func_info& callee, |
1775 | base_func_info& caller, | |
67959c62 JL |
1776 | stack<Dwarf_Addr> *callers, |
1777 | dwarf_query * q) | |
1778 | { | |
1779 | assert (q->has_function_str); | |
e772a6e7 JL |
1780 | assert (q->has_callee || q->has_callees_num); |
1781 | ||
1782 | // OK, we found a callee for a targeted caller. To help users see the | |
04a89a2a | 1783 | // derivation, we add the well-formed form .function(caller).callee(callee). |
e772a6e7 | 1784 | |
e772a6e7 JL |
1785 | string canon_caller = q->final_function_name(caller.name, caller.decl_file, |
1786 | caller.decl_line); | |
1787 | string canon_callee = q->final_function_name(callee.name, callee.decl_file, | |
1788 | callee.decl_line); | |
1789 | ||
04a89a2a JL |
1790 | q->mount_well_formed_probe_point(); |
1791 | q->replace_probe_point_component_arg(TOK_FUNCTION, canon_caller); | |
1792 | q->replace_probe_point_component_arg(TOK_CALLEES, TOK_CALLEE, canon_callee); | |
1793 | q->replace_probe_point_component_arg(TOK_CALLEE, canon_callee); | |
e772a6e7 JL |
1794 | |
1795 | // Pass on the callers we'll need to add checks for | |
04a89a2a | 1796 | q->callers = callers; |
e772a6e7 JL |
1797 | |
1798 | query_statement(callee.name, callee.decl_file, callee.decl_line, | |
04a89a2a JL |
1799 | &callee.die, callee.entrypc, q); |
1800 | ||
1801 | q->unmount_well_formed_probe_point(); | |
67959c62 JL |
1802 | } |
1803 | ||
7e1279ea | 1804 | static void |
3e961ba6 | 1805 | query_inline_instance_info (inline_instance_info & ii, |
7e1279ea FCE |
1806 | dwarf_query * q) |
1807 | { | |
b6581717 | 1808 | try |
7e1279ea | 1809 | { |
8f14e444 | 1810 | assert (! q->has_return); // checked by caller already |
8debd4e7 JL |
1811 | assert (q->has_function_str || q->has_statement_str); |
1812 | ||
8f14e444 | 1813 | if (q->sess.verbose>2) |
b530b5b3 LB |
1814 | clog << _F("querying entrypc %#" PRIx64 " of instance of inline '%s'\n", |
1815 | ii.entrypc, ii.name.c_str()); | |
8debd4e7 JL |
1816 | |
1817 | string canon_func = q->final_function_name(ii.name, ii.decl_file, | |
1818 | ii.decl_line); | |
1819 | ||
1820 | q->mount_well_formed_probe_point(); | |
1821 | q->replace_probe_point_component_arg(TOK_FUNCTION, canon_func); | |
1822 | q->replace_probe_point_component_arg(TOK_STATEMENT, canon_func); | |
1823 | ||
8f14e444 FCE |
1824 | query_statement (ii.name, ii.decl_file, ii.decl_line, |
1825 | &ii.die, ii.entrypc, q); | |
8debd4e7 JL |
1826 | |
1827 | q->unmount_well_formed_probe_point(); | |
7e1279ea | 1828 | } |
b6581717 | 1829 | catch (semantic_error &e) |
7e1279ea | 1830 | { |
b6581717 | 1831 | q->sess.print_error (e); |
7e1279ea FCE |
1832 | } |
1833 | } | |
1834 | ||
1835 | static void | |
1836 | query_func_info (Dwarf_Addr entrypc, | |
bcc12710 | 1837 | func_info & fi, |
7e1279ea FCE |
1838 | dwarf_query * q) |
1839 | { | |
e5745975 JL |
1840 | assert(q->has_function_str || q->has_statement_str); |
1841 | ||
b6581717 | 1842 | try |
7e1279ea | 1843 | { |
e5745975 JL |
1844 | string canon_func = q->final_function_name(fi.name, fi.decl_file, |
1845 | fi.decl_line); | |
1846 | ||
1847 | q->mount_well_formed_probe_point(); | |
1848 | q->replace_probe_point_component_arg(TOK_FUNCTION, canon_func); | |
1849 | q->replace_probe_point_component_arg(TOK_STATEMENT, canon_func); | |
1850 | ||
5a617dc6 JL |
1851 | // If it's a .return probe, we need to emit a *retprobe based on the |
1852 | // entrypc (PR13200). Note however that if prologue_end is valid, | |
1853 | // dwarf_derived_probe will still take advantage of it by creating a new | |
1854 | // probe there if necessary to pick up target vars (PR14436). | |
1855 | if (fi.prologue_end == 0 || q->has_return) | |
1856 | { | |
170ccf10 | 1857 | q->prologue_end = fi.prologue_end; |
5a617dc6 JL |
1858 | query_statement (fi.name, fi.decl_file, fi.decl_line, |
1859 | &fi.die, entrypc, q); | |
1860 | } | |
b6581717 | 1861 | else |
5a617dc6 | 1862 | { |
5a617dc6 JL |
1863 | query_statement (fi.name, fi.decl_file, fi.decl_line, |
1864 | &fi.die, fi.prologue_end, q); | |
1865 | } | |
e5745975 JL |
1866 | |
1867 | q->unmount_well_formed_probe_point(); | |
7e1279ea | 1868 | } |
b6581717 | 1869 | catch (semantic_error &e) |
7e1279ea | 1870 | { |
b6581717 | 1871 | q->sess.print_error (e); |
7e1279ea FCE |
1872 | } |
1873 | } | |
1874 | ||
7e1279ea | 1875 | static void |
de797211 | 1876 | query_srcfile_line (Dwarf_Addr addr, int lineno, dwarf_query * q) |
7e1279ea | 1877 | { |
8fb810d7 JL |
1878 | assert (q->has_statement_str || q->has_function_str); |
1879 | assert (q->spec_type == function_file_and_line); | |
1880 | ||
959ccfed JL |
1881 | base_func_info_map_t bfis = q->filtered_all(); |
1882 | base_func_info_map_t::iterator i; | |
1883 | for (i = bfis.begin(); i != bfis.end(); ++i) | |
897820ca | 1884 | { |
3e961ba6 | 1885 | if (q->dw.die_has_pc (i->die, addr)) |
959ccfed JL |
1886 | { |
1887 | if (q->sess.verbose>3) | |
1888 | clog << _("filtered DIE lands on srcfile\n"); | |
1889 | Dwarf_Die scope; | |
1890 | q->dw.inner_die_containing_pc(i->die, addr, scope); | |
e5bc2e52 JL |
1891 | |
1892 | string canon_func = q->final_function_name(i->name, i->decl_file, | |
1893 | lineno /* NB: not i->decl_line */ ); | |
1894 | ||
1895 | q->mount_well_formed_probe_point(); | |
1896 | q->replace_probe_point_component_arg(TOK_FUNCTION, canon_func); | |
1897 | q->replace_probe_point_component_arg(TOK_STATEMENT, canon_func); | |
1898 | ||
959ccfed JL |
1899 | query_statement (i->name, i->decl_file, |
1900 | lineno, // NB: not q->line ! | |
1901 | &scope, addr, q); | |
e5bc2e52 JL |
1902 | |
1903 | q->unmount_well_formed_probe_point(); | |
959ccfed | 1904 | } |
20e4a32c | 1905 | } |
7e1279ea FCE |
1906 | } |
1907 | ||
7fdd3e2c JS |
1908 | bool |
1909 | inline_instance_info::operator<(const inline_instance_info& other) const | |
1910 | { | |
1911 | if (entrypc != other.entrypc) | |
1912 | return entrypc < other.entrypc; | |
1913 | ||
1914 | if (decl_line != other.decl_line) | |
1915 | return decl_line < other.decl_line; | |
1916 | ||
1917 | int cmp = name.compare(other.name); | |
c60517ca FCE |
1918 | |
1919 | if (!cmp) | |
1920 | { | |
1921 | assert (decl_file); | |
1922 | assert (other.decl_file); | |
1923 | cmp = strcmp(decl_file, other.decl_file); | |
1924 | } | |
1925 | ||
7fdd3e2c JS |
1926 | return cmp < 0; |
1927 | } | |
1928 | ||
1929 | ||
4fa7b22b | 1930 | static int |
3956fccb | 1931 | query_dwarf_inline_instance (Dwarf_Die * die, dwarf_query * q) |
4fa7b22b | 1932 | { |
6b517475 | 1933 | assert (q->has_statement_str || q->has_function_str); |
4bda987e | 1934 | assert (!q->has_call && !q->has_return && !q->has_exported); |
bd2b1e68 | 1935 | |
39bcd429 | 1936 | try |
7a053d3b | 1937 | { |
b0ee93c4 | 1938 | if (q->sess.verbose>2) |
b530b5b3 | 1939 | clog << _F("selected inline instance of %s\n", q->dw.function_name.c_str()); |
7e1279ea | 1940 | |
6b517475 JS |
1941 | Dwarf_Addr entrypc; |
1942 | if (q->dw.die_entrypc (die, &entrypc)) | |
1943 | { | |
1944 | inline_instance_info inl; | |
1945 | inl.die = *die; | |
1946 | inl.name = q->dw.function_name; | |
1947 | inl.entrypc = entrypc; | |
1948 | q->dw.function_file (&inl.decl_file); | |
1949 | q->dw.function_line (&inl.decl_line); | |
1950 | ||
1951 | // make sure that this inline hasn't already | |
1952 | // been matched from a different CU | |
1953 | if (q->inline_dupes.insert(inl).second) | |
1954 | q->filtered_inlines.push_back(inl); | |
1955 | } | |
7e1279ea FCE |
1956 | return DWARF_CB_OK; |
1957 | } | |
1958 | catch (const semantic_error& e) | |
1959 | { | |
1960 | q->sess.print_error (e); | |
1961 | return DWARF_CB_ABORT; | |
1962 | } | |
1963 | } | |
bb788f9f | 1964 | |
7e1279ea | 1965 | static int |
7d007451 | 1966 | query_dwarf_func (Dwarf_Die * func, dwarf_query * q) |
7e1279ea | 1967 | { |
6b517475 | 1968 | assert (q->has_statement_str || q->has_function_str); |
bb788f9f | 1969 | |
bd25380d JS |
1970 | // weed out functions whose decl_file isn't one of |
1971 | // the source files that we actually care about | |
6b517475 | 1972 | if (q->spec_type != function_alone && |
bd25380d | 1973 | q->filtered_srcfiles.count(dwarf_decl_file(func)?:"") == 0) |
8096dd7d | 1974 | return DWARF_CB_OK; |
bd25380d | 1975 | |
7e1279ea FCE |
1976 | try |
1977 | { | |
7e1279ea FCE |
1978 | q->dw.focus_on_function (func); |
1979 | ||
7d6d0afc JS |
1980 | if (!q->dw.function_scope_matches(q->scopes)) |
1981 | return DWARF_CB_OK; | |
1982 | ||
857bdfd1 JS |
1983 | // make sure that this function address hasn't |
1984 | // already been matched under an aliased name | |
1985 | Dwarf_Addr addr; | |
1986 | if (!q->dw.func_is_inline() && | |
1987 | dwarf_entrypc(func, &addr) == 0 && | |
1988 | !q->alias_dupes.insert(addr).second) | |
1989 | return DWARF_CB_OK; | |
1990 | ||
4bda987e | 1991 | if (q->dw.func_is_inline () && (! q->has_call) && (! q->has_return) && (! q->has_exported)) |
7e1279ea | 1992 | { |
4bda987e | 1993 | if (q->sess.verbose>3) |
b530b5b3 | 1994 | clog << _F("checking instances of inline %s\n", q->dw.function_name.c_str()); |
4bda987e | 1995 | q->dw.iterate_over_inline_instances (query_dwarf_inline_instance, q); |
7e1279ea | 1996 | } |
8f14e444 FCE |
1997 | else if (q->dw.func_is_inline () && (q->has_return)) // PR 11553 |
1998 | { | |
1999 | q->inlined_non_returnable.insert (q->dw.function_name); | |
2000 | } | |
396afcee | 2001 | else if (!q->dw.func_is_inline () && (! q->has_inline)) |
20e4a32c | 2002 | { |
4bda987e SC |
2003 | if (q->has_exported && !q->dw.func_is_exported ()) |
2004 | return DWARF_CB_OK; | |
6b517475 | 2005 | if (q->sess.verbose>2) |
b530b5b3 | 2006 | clog << _F("selected function %s\n", q->dw.function_name.c_str()); |
6b517475 JS |
2007 | |
2008 | func_info func; | |
2009 | q->dw.function_die (&func.die); | |
2010 | func.name = q->dw.function_name; | |
2011 | q->dw.function_file (&func.decl_file); | |
2012 | q->dw.function_line (&func.decl_line); | |
2013 | ||
2014 | Dwarf_Addr entrypc; | |
2015 | if (q->dw.function_entrypc (&entrypc)) | |
2016 | { | |
2017 | func.entrypc = entrypc; | |
2018 | q->filtered_functions.push_back (func); | |
2019 | } | |
2020 | /* else this function is fully inlined, just ignore it */ | |
7e1279ea | 2021 | } |
39bcd429 | 2022 | return DWARF_CB_OK; |
bd2b1e68 | 2023 | } |
39bcd429 | 2024 | catch (const semantic_error& e) |
bd2b1e68 | 2025 | { |
39bcd429 FCE |
2026 | q->sess.print_error (e); |
2027 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2028 | } |
bd2b1e68 GH |
2029 | } |
2030 | ||
2031 | static int | |
5c378838 | 2032 | query_cu (Dwarf_Die * cudie, dwarf_query * q) |
bd2b1e68 | 2033 | { |
6b517475 JS |
2034 | assert (q->has_statement_str || q->has_function_str); |
2035 | ||
85007c04 | 2036 | if (pending_interrupts) return DWARF_CB_ABORT; |
7a053d3b | 2037 | |
39bcd429 | 2038 | try |
bd2b1e68 | 2039 | { |
7e1279ea | 2040 | q->dw.focus_on_cu (cudie); |
b5d77020 | 2041 | |
b0ee93c4 | 2042 | if (false && q->sess.verbose>2) |
b530b5b3 LB |
2043 | clog << _F("focused on CU '%s', in module '%s'\n", |
2044 | q->dw.cu_name().c_str(), q->dw.module_name.c_str()); | |
d9b516ca | 2045 | |
6b517475 JS |
2046 | q->filtered_srcfiles.clear(); |
2047 | q->filtered_functions.clear(); | |
2048 | q->filtered_inlines.clear(); | |
2049 | ||
2050 | // In this path, we find "abstract functions", record | |
2051 | // information about them, and then (depending on lineno | |
2052 | // matching) possibly emit one or more of the function's | |
2053 | // associated addresses. Unfortunately the control of this | |
2054 | // cannot easily be turned inside out. | |
2055 | ||
2056 | if (q->spec_type != function_alone) | |
39bcd429 | 2057 | { |
6b517475 JS |
2058 | // If we have a pattern string with a filename, we need |
2059 | // to elaborate the srcfile mask in question first. | |
2060 | q->dw.collect_srcfiles_matching (q->file, q->filtered_srcfiles); | |
2061 | ||
2062 | // If we have a file pattern and *no* srcfile matches, there's | |
2063 | // no need to look further into this CU, so skip. | |
2064 | if (q->filtered_srcfiles.empty()) | |
2065 | return DWARF_CB_OK; | |
2066 | } | |
e4c58386 | 2067 | |
6b517475 JS |
2068 | // Pick up [entrypc, name, DIE] tuples for all the functions |
2069 | // matching the query, and fill in the prologue endings of them | |
2070 | // all in a single pass. | |
5898b6e1 | 2071 | int rc = q->dw.iterate_over_functions (query_dwarf_func, q, q->function); |
6b517475 JS |
2072 | if (rc != DWARF_CB_OK) |
2073 | q->query_done = true; | |
2074 | ||
277a2b96 JL |
2075 | if (!q->filtered_functions.empty() && |
2076 | !q->has_statement_str && // PR 2608 | |
2077 | (q->sess.prologue_searching || | |
2078 | (q->has_process && !q->dw.has_valid_locs()))) // PR 6871 && PR 6941 | |
2079 | q->dw.resolve_prologue_endings (q->filtered_functions); | |
6b517475 | 2080 | |
600d39f1 | 2081 | if (q->has_label) |
6b517475 | 2082 | { |
600d39f1 JL |
2083 | enum lineno_t lineno_type = WILDCARD; |
2084 | if (q->spec_type == function_file_and_line) | |
2085 | lineno_type = q->lineno_type; | |
959ccfed JL |
2086 | base_func_info_map_t bfis = q->filtered_all(); |
2087 | base_func_info_map_t::iterator i; | |
2088 | for (i = bfis.begin(); i != bfis.end(); ++i) | |
600d39f1 JL |
2089 | q->dw.iterate_over_labels (&i->die, q->label_val, *i, q->linenos, |
2090 | lineno_type, q, query_label); | |
39bcd429 | 2091 | } |
67959c62 JL |
2092 | else if (q->has_callee || q->has_callees_num) |
2093 | { | |
2094 | // .callee(str) --> str, .callees[(N)] --> "*" | |
2095 | string callee_val = q->has_callee ? q->callee_val : "*"; | |
2096 | long callees_num_val = q->has_callees_num ? q->callees_num_val : 1; | |
2097 | ||
2098 | // NB: We filter functions that do not match the file here rather than | |
2099 | // in query_callee because we only want the filtering to apply to the | |
2100 | // first level, not to callees that are recursed into if | |
2101 | // callees_num_val > 1. | |
959ccfed JL |
2102 | base_func_info_map_t bfis = q->filtered_all(); |
2103 | base_func_info_map_t::iterator i; | |
2104 | for (i = bfis.begin(); i != bfis.end(); ++i) | |
67959c62 JL |
2105 | { |
2106 | if (q->spec_type != function_alone && | |
2107 | q->filtered_srcfiles.count(i->decl_file) == 0) | |
2108 | continue; | |
2109 | q->dw.iterate_over_callees (&i->die, callee_val, | |
2110 | callees_num_val, | |
e772a6e7 | 2111 | q, query_callee, *i); |
67959c62 JL |
2112 | } |
2113 | } | |
600d39f1 JL |
2114 | else if (q->spec_type == function_file_and_line) |
2115 | { | |
2116 | // .statement(...:NN) often gets mixed up with .function(...:NN) | |
2117 | if (q->has_function_str) | |
2118 | q->sess.print_warning (_("For probing a particular line, use a " | |
2119 | ".statement() probe, not .function()"), | |
2120 | q->base_probe->tok); | |
2121 | ||
2122 | base_func_info_map_t bfis = q->filtered_all(); | |
2123 | ||
2124 | set<string>::const_iterator srcfile; | |
2125 | for (srcfile = q->filtered_srcfiles.begin(); | |
2126 | srcfile != q->filtered_srcfiles.end(); ++srcfile) | |
2127 | q->dw.iterate_over_srcfile_lines(srcfile->c_str(), q->linenos, | |
2128 | q->lineno_type, bfis, | |
2129 | query_srcfile_line, q); | |
2130 | } | |
6b517475 JS |
2131 | else |
2132 | { | |
2133 | // Otherwise, simply probe all resolved functions. | |
2134 | for (func_info_map_t::iterator i = q->filtered_functions.begin(); | |
2135 | i != q->filtered_functions.end(); ++i) | |
2136 | query_func_info (i->entrypc, *i, q); | |
2137 | ||
2138 | // And all inline instances (if we're not excluding inlines with ".call") | |
2139 | if (! q->has_call) | |
2140 | for (inline_instance_map_t::iterator i | |
2141 | = q->filtered_inlines.begin(); i != q->filtered_inlines.end(); ++i) | |
2142 | query_inline_instance_info (*i, q); | |
e772a6e7 | 2143 | } |
39bcd429 | 2144 | return DWARF_CB_OK; |
bd2b1e68 | 2145 | } |
39bcd429 | 2146 | catch (const semantic_error& e) |
bd2b1e68 | 2147 | { |
39bcd429 FCE |
2148 | q->sess.print_error (e); |
2149 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2150 | } |
bd2b1e68 GH |
2151 | } |
2152 | ||
0ce64fb8 | 2153 | |
4df79aaf JS |
2154 | void |
2155 | dwarf_query::query_module_functions () | |
2156 | { | |
2157 | try | |
2158 | { | |
2159 | filtered_srcfiles.clear(); | |
2160 | filtered_functions.clear(); | |
2161 | filtered_inlines.clear(); | |
2162 | ||
2163 | // Collect all module functions so we know which CUs are interesting | |
2164 | int rc = dw.iterate_single_function(query_dwarf_func, this, function); | |
2165 | if (rc != DWARF_CB_OK) | |
2166 | { | |
2167 | query_done = true; | |
2168 | return; | |
2169 | } | |
2170 | ||
2171 | set<void*> used_cus; // by cu->addr | |
2172 | vector<Dwarf_Die> cus; | |
2173 | Dwarf_Die cu_mem; | |
2174 | ||
959ccfed JL |
2175 | base_func_info_map_t bfis = filtered_all(); |
2176 | base_func_info_map_t::iterator i; | |
2177 | for (i = bfis.begin(); i != bfis.end(); ++i) | |
4df79aaf JS |
2178 | if (dwarf_diecu(&i->die, &cu_mem, NULL, NULL) && |
2179 | used_cus.insert(cu_mem.addr).second) | |
2180 | cus.push_back(cu_mem); | |
2181 | ||
2182 | // Reset the dupes since we didn't actually collect them the first time | |
2183 | alias_dupes.clear(); | |
2184 | inline_dupes.clear(); | |
2185 | ||
2186 | // Run the query again on the individual CUs | |
91bb9081 LB |
2187 | for (vector<Dwarf_Die>::iterator i = cus.begin(); i != cus.end(); ++i){ |
2188 | rc = query_cu(&*i, this); | |
2189 | if (rc != DWARF_CB_OK) | |
2190 | { | |
2191 | query_done = true; | |
2192 | return; | |
2193 | } | |
2194 | } | |
4df79aaf JS |
2195 | } |
2196 | catch (const semantic_error& e) | |
2197 | { | |
2198 | sess.print_error (e); | |
2199 | } | |
2200 | } | |
2201 | ||
2202 | ||
5f0a03a6 JK |
2203 | static void |
2204 | validate_module_elf (Dwfl_Module *mod, const char *name, base_query *q) | |
2205 | { | |
2206 | // Validate the machine code in this elf file against the | |
2207 | // session machine. This is important, in case the wrong kind | |
2208 | // of debuginfo is being automagically processed by elfutils. | |
2209 | // While we can tell i686 apart from x86-64, unfortunately | |
2210 | // we can't help confusing i586 vs i686 (both EM_386). | |
2211 | ||
2212 | Dwarf_Addr bias; | |
2213 | // We prefer dwfl_module_getdwarf to dwfl_module_getelf here, | |
2214 | // because dwfl_module_getelf can force costly section relocations | |
2215 | // we don't really need, while either will do for this purpose. | |
2216 | Elf* elf = (dwarf_getelf (dwfl_module_getdwarf (mod, &bias)) | |
2217 | ?: dwfl_module_getelf (mod, &bias)); | |
2218 | ||
2219 | GElf_Ehdr ehdr_mem; | |
2220 | GElf_Ehdr* em = gelf_getehdr (elf, &ehdr_mem); | |
e1c3b13a | 2221 | if (em == 0) { DWFL_ASSERT ("dwfl_getehdr", dwfl_errno()); } |
d8f31d0a | 2222 | assert(em); |
5f0a03a6 JK |
2223 | int elf_machine = em->e_machine; |
2224 | const char* debug_filename = ""; | |
2225 | const char* main_filename = ""; | |
2226 | (void) dwfl_module_info (mod, NULL, NULL, | |
2227 | NULL, NULL, NULL, | |
2228 | & main_filename, | |
2229 | & debug_filename); | |
2230 | const string& sess_machine = q->sess.architecture; | |
756c9462 FCE |
2231 | |
2232 | string expect_machine; // to match sess.machine (i.e., kernel machine) | |
2233 | string expect_machine2; | |
5f0a03a6 | 2234 | |
d27e6fd5 | 2235 | // NB: See also the 'uname -m' squashing done in main.cxx. |
5f0a03a6 JK |
2236 | switch (elf_machine) |
2237 | { | |
756c9462 FCE |
2238 | // x86 and ppc are bi-architecture; a 64-bit kernel |
2239 | // can normally run either 32-bit or 64-bit *userspace*. | |
2240 | case EM_386: | |
2241 | expect_machine = "i?86"; | |
2242 | if (! q->has_process) break; // 32-bit kernel/module | |
2243 | /* FALLSTHROUGH */ | |
2244 | case EM_X86_64: | |
2245 | expect_machine2 = "x86_64"; | |
2246 | break; | |
2247 | case EM_PPC: | |
756c9462 | 2248 | case EM_PPC64: |
5a1c472e | 2249 | expect_machine = "powerpc"; |
756c9462 | 2250 | break; |
3fe7d888 | 2251 | case EM_S390: expect_machine = "s390"; break; |
5f0a03a6 | 2252 | case EM_IA_64: expect_machine = "ia64"; break; |
d27e6fd5 | 2253 | case EM_ARM: expect_machine = "arm*"; break; |
86aae990 | 2254 | case EM_AARCH64: expect_machine = "arm64"; break; |
5f0a03a6 JK |
2255 | // XXX: fill in some more of these |
2256 | default: expect_machine = "?"; break; | |
2257 | } | |
2258 | ||
2259 | if (! debug_filename) debug_filename = main_filename; | |
2260 | if (! debug_filename) debug_filename = name; | |
2261 | ||
756c9462 FCE |
2262 | if (fnmatch (expect_machine.c_str(), sess_machine.c_str(), 0) != 0 && |
2263 | fnmatch (expect_machine2.c_str(), sess_machine.c_str(), 0) != 0) | |
5f0a03a6 JK |
2264 | { |
2265 | stringstream msg; | |
b530b5b3 LB |
2266 | msg << _F("ELF machine %s|%s (code %d) mismatch with target %s in '%s'", |
2267 | expect_machine.c_str(), expect_machine2.c_str(), elf_machine, | |
2268 | sess_machine.c_str(), debug_filename); | |
dc09353a | 2269 | throw SEMANTIC_ERROR(msg.str ()); |
5f0a03a6 JK |
2270 | } |
2271 | ||
b57082de | 2272 | if (q->sess.verbose>1) |
b78a0fbb | 2273 | clog << _F("focused on module '%s' = [%#" PRIx64 "-%#" PRIx64 ", bias %#" PRIx64 |
b530b5b3 LB |
2274 | " file %s ELF machine %s|%s (code %d)\n", |
2275 | q->dw.module_name.c_str(), q->dw.module_start, q->dw.module_end, | |
2276 | q->dw.module_bias, debug_filename, expect_machine.c_str(), | |
2277 | expect_machine2.c_str(), elf_machine); | |
5f0a03a6 | 2278 | } |
1d3a40b6 | 2279 | |
91af0778 FCE |
2280 | |
2281 | ||
2282 | static Dwarf_Addr | |
2283 | lookup_symbol_address (Dwfl_Module *m, const char* wanted) | |
2284 | { | |
2285 | int syments = dwfl_module_getsymtab(m); | |
2286 | assert(syments); | |
2287 | for (int i = 1; i < syments; ++i) | |
2288 | { | |
2289 | GElf_Sym sym; | |
2290 | const char *name = dwfl_module_getsym(m, i, &sym, NULL); | |
2291 | if (name != NULL && strcmp(name, wanted) == 0) | |
2292 | return sym.st_value; | |
2293 | } | |
2294 | ||
2295 | return 0; | |
2296 | } | |
2297 | ||
2298 | ||
2299 | ||
bd2b1e68 | 2300 | static int |
b8da0ad1 | 2301 | query_module (Dwfl_Module *mod, |
91af0778 | 2302 | void **, |
b8da0ad1 | 2303 | const char *name, |
6f4c1275 | 2304 | Dwarf_Addr addr, |
06de3a04 | 2305 | base_query *q) |
bd2b1e68 | 2306 | { |
39bcd429 | 2307 | try |
e38d6504 | 2308 | { |
91af0778 FCE |
2309 | module_info* mi = q->sess.module_cache->cache[name]; |
2310 | if (mi == 0) | |
2311 | { | |
2312 | mi = q->sess.module_cache->cache[name] = new module_info(name); | |
2313 | ||
6f4c1275 FCE |
2314 | mi->mod = mod; |
2315 | mi->addr = addr; | |
91af0778 | 2316 | |
6f4c1275 FCE |
2317 | const char* debug_filename = ""; |
2318 | const char* main_filename = ""; | |
2319 | (void) dwfl_module_info (mod, NULL, NULL, | |
2320 | NULL, NULL, NULL, | |
2321 | & main_filename, | |
2322 | & debug_filename); | |
2323 | ||
ab3ed72d | 2324 | if (debug_filename || main_filename) |
91af0778 | 2325 | { |
6f4c1275 FCE |
2326 | mi->elf_path = debug_filename ?: main_filename; |
2327 | } | |
2328 | else if (name == TOK_KERNEL) | |
2329 | { | |
2330 | mi->dwarf_status = info_absent; | |
91af0778 | 2331 | } |
91af0778 FCE |
2332 | } |
2333 | // OK, enough of that module_info caching business. | |
2334 | ||
5f0a03a6 | 2335 | q->dw.focus_on_module(mod, mi); |
d9b516ca | 2336 | |
39bcd429 FCE |
2337 | // If we have enough information in the pattern to skip a module and |
2338 | // the module does not match that information, return early. | |
b8da0ad1 | 2339 | if (!q->dw.module_name_matches(q->module_val)) |
85007c04 | 2340 | return pending_interrupts ? DWARF_CB_ABORT : DWARF_CB_OK; |
0cbbf9d1 FCE |
2341 | |
2342 | // Don't allow module("*kernel*") type expressions to match the | |
2343 | // elfutils module "kernel", which we refer to in the probe | |
2344 | // point syntax exclusively as "kernel.*". | |
2345 | if (q->dw.module_name == TOK_KERNEL && ! q->has_kernel) | |
85007c04 | 2346 | return pending_interrupts ? DWARF_CB_ABORT : DWARF_CB_OK; |
b5d77020 | 2347 | |
5f0a03a6 JK |
2348 | if (mod) |
2349 | validate_module_elf(mod, name, q); | |
2350 | else | |
91af0778 FCE |
2351 | assert(q->has_kernel); // and no vmlinux to examine |
2352 | ||
2353 | if (q->sess.verbose>2) | |
b530b5b3 | 2354 | cerr << _F("focused on module '%s'\n", q->dw.module_name.c_str()); |
91af0778 FCE |
2355 | |
2356 | ||
2357 | // Collect a few kernel addresses. XXX: these belong better | |
2358 | // to the sess.module_info["kernel"] struct. | |
2359 | if (q->dw.module_name == TOK_KERNEL) | |
c931ec8a | 2360 | { |
91af0778 FCE |
2361 | if (! q->sess.sym_kprobes_text_start) |
2362 | q->sess.sym_kprobes_text_start = lookup_symbol_address (mod, "__kprobes_text_start"); | |
2363 | if (! q->sess.sym_kprobes_text_end) | |
2364 | q->sess.sym_kprobes_text_end = lookup_symbol_address (mod, "__kprobes_text_end"); | |
2365 | if (! q->sess.sym_stext) | |
2366 | q->sess.sym_stext = lookup_symbol_address (mod, "_stext"); | |
c931ec8a FCE |
2367 | } |
2368 | ||
dbe9d133 JL |
2369 | // If there is a .library component, then q->path will hold the path to |
2370 | // the executable if the library was fully resolved. If not (e.g. not | |
2371 | // absolute, or globby), resort to iterate_over_libraries(). | |
2372 | if (q->has_library && q->path.empty()) | |
84c84ac4 | 2373 | q->dw.iterate_over_libraries (&q->query_library_callback, q); |
576eaefe SC |
2374 | // .plt is translated to .plt.statement(N). We only want to iterate for the |
2375 | // .plt case | |
2376 | else if (q->has_plt && ! q->has_statement) | |
070764c0 JL |
2377 | { |
2378 | q->dw.iterate_over_plt (q, &q->query_plt_callback); | |
2379 | q->visited_modules.insert(name); | |
2380 | } | |
84c84ac4 | 2381 | else |
070764c0 JL |
2382 | { |
2383 | // search the module for matches of the probe point. | |
2384 | q->handle_query_module(); | |
2385 | q->visited_modules.insert(name); | |
2386 | } | |
bb788f9f | 2387 | |
b8da0ad1 | 2388 | // If we know that there will be no more matches, abort early. |
85007c04 | 2389 | if (q->dw.module_name_final_match(q->module_val) || pending_interrupts) |
b8da0ad1 FCE |
2390 | return DWARF_CB_ABORT; |
2391 | else | |
2392 | return DWARF_CB_OK; | |
7a053d3b | 2393 | } |
39bcd429 | 2394 | catch (const semantic_error& e) |
bd2b1e68 | 2395 | { |
39bcd429 FCE |
2396 | q->sess.print_error (e); |
2397 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2398 | } |
bd2b1e68 GH |
2399 | } |
2400 | ||
35d4ab18 | 2401 | |
84c84ac4 | 2402 | void |
bbbc7241 | 2403 | base_query::query_library_callback (base_query *me, const char *data) |
84c84ac4 | 2404 | { |
5d5bd369 | 2405 | me->query_library (data); |
84c84ac4 SC |
2406 | } |
2407 | ||
2408 | ||
614f0fcf JL |
2409 | probe* |
2410 | build_library_probe(dwflpp& dw, | |
2411 | const string& library, | |
2412 | probe *base_probe, | |
2413 | probe_point *base_loc) | |
2414 | { | |
2415 | probe_point* specific_loc = new probe_point(*base_loc); | |
614f0fcf JL |
2416 | specific_loc->from_glob = true; |
2417 | vector<probe_point::component*> derived_comps; | |
2418 | ||
2419 | // Create new probe point for the matching library. This is what will be | |
2420 | // shown in listing mode. Also replace the process(str) with the real | |
2421 | // absolute path rather than keeping what the user typed in. | |
2422 | vector<probe_point::component*>::iterator it; | |
2423 | for (it = specific_loc->components.begin(); | |
2424 | it != specific_loc->components.end(); ++it) | |
2425 | if ((*it)->functor == TOK_PROCESS) | |
2426 | derived_comps.push_back(new probe_point::component(TOK_PROCESS, | |
2427 | new literal_string(path_remove_sysroot(dw.sess, dw.module_name)))); | |
2428 | else if ((*it)->functor == TOK_LIBRARY) | |
2429 | derived_comps.push_back(new probe_point::component(TOK_LIBRARY, | |
2430 | new literal_string(path_remove_sysroot(dw.sess, library)))); | |
2431 | else | |
2432 | derived_comps.push_back(*it); | |
2433 | probe_point* derived_loc = new probe_point(*specific_loc); | |
2434 | derived_loc->components = derived_comps; | |
2435 | return new probe (new probe (base_probe, specific_loc), derived_loc); | |
2436 | } | |
2437 | ||
2438 | bool | |
51d6bda3 SC |
2439 | query_one_library (const char *library, dwflpp & dw, |
2440 | const string user_lib, probe * base_probe, probe_point *base_loc, | |
2441 | vector<derived_probe *> & results) | |
84c84ac4 | 2442 | { |
47e226ed | 2443 | if (dw.function_name_matches_pattern(library, "*" + user_lib)) |
84c84ac4 | 2444 | { |
05fb3e0c WF |
2445 | string library_path = find_executable (library, "", dw.sess.sysenv, |
2446 | "LD_LIBRARY_PATH"); | |
168e2ef5 JL |
2447 | probe *new_base = build_library_probe(dw, library_path, |
2448 | base_probe, base_loc); | |
2449 | ||
2450 | // We pass true for the optional parameter of derive_probes() here to | |
2451 | // indicate that we don't mind if the probe doesn't resolve. This is | |
2452 | // because users expect wildcarded probe points to only apply to a subset | |
2453 | // of matching libraries, in the sense of "any", rather than "all", just | |
2454 | // like module("*") and process("*"). See also dwarf_builder::build(). | |
2455 | derive_probes(dw.sess, new_base, results, true /* optional */ ); | |
2456 | ||
51d6bda3 | 2457 | if (dw.sess.verbose > 2) |
2cbcfa9c | 2458 | clog << _("module=") << library_path << endl; |
614f0fcf | 2459 | return true; |
84c84ac4 | 2460 | } |
614f0fcf | 2461 | return false; |
84c84ac4 SC |
2462 | } |
2463 | ||
2464 | ||
51d6bda3 SC |
2465 | void |
2466 | dwarf_query::query_library (const char *library) | |
2467 | { | |
614f0fcf JL |
2468 | visited_libraries.insert(library); |
2469 | if (query_one_library (library, dw, user_lib, base_probe, base_loc, results)) | |
2470 | resolved_library = true; | |
51d6bda3 SC |
2471 | } |
2472 | ||
576eaefe SC |
2473 | struct plt_expanding_visitor: public var_expanding_visitor |
2474 | { | |
2475 | plt_expanding_visitor(const string & entry): | |
2476 | entry (entry) | |
2477 | { | |
2478 | } | |
2479 | const string & entry; | |
2480 | ||
2481 | void visit_target_symbol (target_symbol* e); | |
2482 | }; | |
2483 | ||
2484 | ||
2485 | void | |
45cdb40e | 2486 | base_query::query_plt_callback (base_query *me, const char *entry, size_t address) |
576eaefe | 2487 | { |
576eaefe SC |
2488 | if (me->dw.function_name_matches_pattern (entry, me->plt_val)) |
2489 | me->query_plt (entry, address); | |
7f4964f1 | 2490 | me->dw.mod_info->plt_funcs.insert(entry); |
576eaefe SC |
2491 | } |
2492 | ||
2493 | ||
2494 | void | |
2495 | query_one_plt (const char *entry, long addr, dwflpp & dw, | |
2496 | probe * base_probe, probe_point *base_loc, | |
93b44c2a | 2497 | vector<derived_probe *> & results, base_query *q) |
576eaefe | 2498 | { |
93b44c2a JL |
2499 | string module = dw.module_name; |
2500 | if (q->has_process) | |
2501 | module = path_remove_sysroot(dw.sess, module); | |
2502 | ||
576eaefe | 2503 | probe_point* specific_loc = new probe_point(*base_loc); |
93b44c2a JL |
2504 | specific_loc->well_formed = true; |
2505 | ||
576eaefe SC |
2506 | vector<probe_point::component*> derived_comps; |
2507 | ||
2508 | if (dw.sess.verbose > 2) | |
2509 | clog << _F("plt entry=%s\n", entry); | |
2510 | ||
576eaefe SC |
2511 | vector<probe_point::component*>::iterator it; |
2512 | for (it = specific_loc->components.begin(); | |
2513 | it != specific_loc->components.end(); ++it) | |
93b44c2a JL |
2514 | if ((*it)->functor == TOK_PROCESS) |
2515 | { | |
2516 | // Replace with fully resolved path | |
2517 | *it = new probe_point::component(TOK_PROCESS, | |
2518 | new literal_string(q->has_library ? q->path : module)); | |
2519 | derived_comps.push_back(*it); | |
2520 | } | |
2521 | else if ((*it)->functor == TOK_PLT) | |
3d372d6b | 2522 | { |
93b44c2a | 2523 | // Replace possibly globby component |
8159bf55 FCE |
2524 | *it = new probe_point::component(TOK_PLT, |
2525 | new literal_string(entry)); | |
3d372d6b SC |
2526 | derived_comps.push_back(*it); |
2527 | derived_comps.push_back(new probe_point::component(TOK_STATEMENT, | |
ac7c8669 | 2528 | new literal_number(addr, true))); |
3d372d6b | 2529 | } |
576eaefe SC |
2530 | else |
2531 | derived_comps.push_back(*it); | |
2532 | probe_point* derived_loc = new probe_point(*specific_loc); | |
2533 | derived_loc->components = derived_comps; | |
02c34e38 FCE |
2534 | probe *new_base = new probe (new probe (base_probe, specific_loc), |
2535 | derived_loc); | |
576eaefe SC |
2536 | string e = string(entry); |
2537 | plt_expanding_visitor pltv (e); | |
2538 | pltv.replace (new_base->body); | |
2539 | derive_probes(dw.sess, new_base, results); | |
2540 | } | |
2541 | ||
2542 | ||
2543 | void | |
2544 | dwarf_query::query_plt (const char *entry, size_t address) | |
2545 | { | |
93b44c2a | 2546 | query_one_plt (entry, address, dw, base_probe, base_loc, results, this); |
576eaefe | 2547 | } |
51d6bda3 | 2548 | |
435f53a7 FCE |
2549 | // This would more naturally fit into elaborate.cxx:semantic_pass_symbols, |
2550 | // but the needed declaration for module_cache is not available there. | |
2551 | // Nor for that matter in session.cxx. Only in this CU is that field ever | |
2552 | // set (in query_module() above), so we clean it up here too. | |
2553 | static void | |
2554 | delete_session_module_cache (systemtap_session& s) | |
2555 | { | |
2556 | if (s.module_cache) { | |
2557 | if (s.verbose > 3) | |
b530b5b3 | 2558 | clog << _("deleting module_cache") << endl; |
435f53a7 FCE |
2559 | delete s.module_cache; |
2560 | s.module_cache = 0; | |
2561 | } | |
2562 | } | |
2563 | ||
2564 | ||
de688825 | 2565 | struct dwarf_var_expanding_visitor: public var_expanding_visitor |
35d4ab18 | 2566 | { |
77de5e9e | 2567 | dwarf_query & q; |
bcc12710 | 2568 | Dwarf_Die *scope_die; |
77de5e9e | 2569 | Dwarf_Addr addr; |
8c819921 | 2570 | block *add_block; |
2260f4e3 | 2571 | block *add_call_probe; // synthesized from .return probes with saved $vars |
1630966a JS |
2572 | // NB: tids are not always collected in add_block & add_call_probe, because |
2573 | // gen_kretprobe_saved_return doesn't need them. Thus we need these extra | |
2574 | // *_tid bools for gen_mapped_saved_return to tell what's there. | |
8cc799a5 | 2575 | bool add_block_tid, add_call_probe_tid; |
af234c40 JS |
2576 | unsigned saved_longs, saved_strings; // data saved within kretprobes |
2577 | map<std::string, expression *> return_ts_map; | |
729455a7 | 2578 | vector<Dwarf_Die> scopes; |
3689db05 | 2579 | // probe counter name -> pointer of associated probe |
698de6cc | 2580 | std::set<derived_probe*> perf_counter_refs; |
b95e2b79 | 2581 | bool visited; |
77de5e9e | 2582 | |
de688825 | 2583 | dwarf_var_expanding_visitor(dwarf_query & q, Dwarf_Die *sd, Dwarf_Addr a): |
af234c40 | 2584 | q(q), scope_die(sd), addr(a), add_block(NULL), add_call_probe(NULL), |
8cc799a5 | 2585 | add_block_tid(false), add_call_probe_tid(false), |
af234c40 | 2586 | saved_longs(0), saved_strings(0), visited(false) {} |
277c21bc | 2587 | expression* gen_mapped_saved_return(expression* e, const string& name); |
140be17a | 2588 | expression* gen_kretprobe_saved_return(expression* e); |
a7999c82 JS |
2589 | void visit_target_symbol_saved_return (target_symbol* e); |
2590 | void visit_target_symbol_context (target_symbol* e); | |
d7f3e0c5 | 2591 | void visit_target_symbol (target_symbol* e); |
bd1fcbad | 2592 | void visit_atvar_op (atvar_op* e); |
c24447be | 2593 | void visit_cast_op (cast_op* e); |
8cc799a5 | 2594 | void visit_entry_op (entry_op* e); |
3689db05 | 2595 | void visit_perf_op (perf_op* e); |
729455a7 JS |
2596 | private: |
2597 | vector<Dwarf_Die>& getscopes(target_symbol *e); | |
77de5e9e GH |
2598 | }; |
2599 | ||
2600 | ||
de688825 | 2601 | unsigned var_expanding_visitor::tick = 0; |
77de5e9e | 2602 | |
a50de939 | 2603 | |
74fe61bc | 2604 | var_expanding_visitor::var_expanding_visitor (): op() |
a50de939 DS |
2605 | { |
2606 | // FIXME: for the time being, by default we only support plain '$foo | |
2607 | // = bar', not '+=' or any other op= variant. This is fixable, but a | |
2608 | // bit ugly. | |
2609 | // | |
2610 | // If derived classes desire to add additional operator support, add | |
2611 | // new operators to this list in the derived class constructor. | |
2612 | valid_ops.insert ("="); | |
2613 | } | |
2614 | ||
2615 | ||
87214add JS |
2616 | bool |
2617 | var_expanding_visitor::rewrite_lvalue(const token* tok, const std::string& eop, | |
2618 | expression*& lvalue, expression*& rvalue) | |
77de5e9e | 2619 | { |
e57b735a GH |
2620 | // Our job would normally be to require() the left and right sides |
2621 | // into a new assignment. What we're doing is slightly trickier: | |
2622 | // we're pushing a functioncall** onto a stack, and if our left | |
2623 | // child sets the functioncall* for that value, we're going to | |
2624 | // assume our left child was a target symbol -- transformed into a | |
2625 | // set_target_foo(value) call, and it wants to take our right child | |
2626 | // as the argument "value". | |
2627 | // | |
2628 | // This is why some people claim that languages with | |
2629 | // constructor-decomposing case expressions have a leg up on | |
2630 | // visitors. | |
2631 | ||
2632 | functioncall *fcall = NULL; | |
d9b516ca | 2633 | |
a50de939 | 2634 | // Let visit_target_symbol know what operator it should handle. |
87214add JS |
2635 | const string* old_op = op; |
2636 | op = &eop; | |
a50de939 | 2637 | |
e57b735a | 2638 | target_symbol_setter_functioncalls.push (&fcall); |
87214add | 2639 | replace (lvalue); |
e57b735a | 2640 | target_symbol_setter_functioncalls.pop (); |
87214add JS |
2641 | replace (rvalue); |
2642 | ||
2643 | op = old_op; | |
e57b735a GH |
2644 | |
2645 | if (fcall != NULL) | |
77de5e9e | 2646 | { |
e57b735a GH |
2647 | // Our left child is informing us that it was a target variable |
2648 | // and it has been replaced with a set_target_foo() function | |
2649 | // call; we are going to provide that function call -- with the | |
2650 | // right child spliced in as sole argument -- in place of | |
de688825 | 2651 | // ourselves, in the var expansion we're in the middle of making. |
e57b735a | 2652 | |
87214add | 2653 | if (valid_ops.find (eop) == valid_ops.end ()) |
a50de939 DS |
2654 | { |
2655 | // Build up a list of supported operators. | |
2656 | string ops; | |
2657 | std::set<string>::iterator i; | |
b530b5b3 | 2658 | int valid_ops_size = 0; |
a50de939 | 2659 | for (i = valid_ops.begin(); i != valid_ops.end(); i++) |
b530b5b3 | 2660 | { |
a50de939 | 2661 | ops += " " + *i + ","; |
b530b5b3 LB |
2662 | valid_ops_size++; |
2663 | } | |
a50de939 DS |
2664 | ops.resize(ops.size() - 1); // chop off the last ',' |
2665 | ||
2666 | // Throw the error. | |
dc09353a | 2667 | throw SEMANTIC_ERROR (_NF("Only the following assign operator is implemented on target variables: %s", |
1e41115c | 2668 | "Only the following assign operators are implemented on target variables: %s", |
52c2652f | 2669 | valid_ops_size, ops.c_str()), tok); |
b530b5b3 | 2670 | |
a50de939 | 2671 | } |
e57b735a | 2672 | |
87214add JS |
2673 | assert (lvalue == fcall); |
2674 | if (rvalue) | |
2675 | fcall->args.push_back (rvalue); | |
4ed05b15 | 2676 | provide (fcall); |
87214add | 2677 | return true; |
77de5e9e | 2678 | } |
e57b735a | 2679 | else |
87214add JS |
2680 | return false; |
2681 | } | |
2682 | ||
2683 | ||
2684 | void | |
2685 | var_expanding_visitor::visit_assignment (assignment* e) | |
2686 | { | |
2687 | if (!rewrite_lvalue (e->tok, e->op, e->left, e->right)) | |
2688 | provide (e); | |
2689 | } | |
2690 | ||
2691 | ||
2692 | void | |
2693 | var_expanding_visitor::visit_pre_crement (pre_crement* e) | |
2694 | { | |
2695 | expression *dummy = NULL; | |
2696 | if (!rewrite_lvalue (e->tok, e->op, e->operand, dummy)) | |
2697 | provide (e); | |
2698 | } | |
2699 | ||
2700 | ||
2701 | void | |
2702 | var_expanding_visitor::visit_post_crement (post_crement* e) | |
2703 | { | |
2704 | expression *dummy = NULL; | |
2705 | if (!rewrite_lvalue (e->tok, e->op, e->operand, dummy)) | |
2706 | provide (e); | |
2707 | } | |
2708 | ||
2709 | ||
2710 | void | |
2711 | var_expanding_visitor::visit_delete_statement (delete_statement* s) | |
2712 | { | |
2713 | string fakeop = "delete"; | |
2714 | expression *dummy = NULL; | |
2715 | if (!rewrite_lvalue (s->tok, fakeop, s->value, dummy)) | |
2716 | provide (s); | |
e57b735a | 2717 | } |
d9b516ca | 2718 | |
d7f3e0c5 | 2719 | |
30263a73 FCE |
2720 | void |
2721 | var_expanding_visitor::visit_defined_op (defined_op* e) | |
2722 | { | |
2723 | bool resolved = true; | |
2724 | ||
2725 | defined_ops.push (e); | |
2726 | try { | |
2727 | // NB: provide<>/require<> are NOT typesafe. So even though a defined_op is | |
2728 | // defined with a target_symbol* operand, a subsidiary call may attempt to | |
2729 | // rewrite it to a general expression* instead, and require<> happily | |
2730 | // casts to/from void*, causing possible memory corruption. We use | |
2731 | // expression* here, being the general case of rewritten $variable. | |
2732 | expression *foo1 = e->operand; | |
2733 | foo1 = require (foo1); | |
2734 | ||
c69a87e0 | 2735 | // NB: Formerly, we had some curious cases to consider here, depending on what |
30263a73 | 2736 | // various visit_target_symbol() implementations do for successful or |
c69a87e0 FCE |
2737 | // erroneous resolutions. Some would signal a visit_target_symbol failure |
2738 | // with an exception, with a set flag within the target_symbol, or nothing | |
2739 | // at all. | |
30263a73 | 2740 | // |
c69a87e0 FCE |
2741 | // Now, failures always have to be signalled with a |
2742 | // saved_conversion_error being chained to the target_symbol. | |
2743 | // Successes have to result in an attempted rewrite of the | |
850bfddd | 2744 | // target_symbol (via provide()). |
780f11ff | 2745 | // |
c69a87e0 FCE |
2746 | // Edna Mode: "no capes". fche: "no exceptions". |
2747 | ||
30263a73 FCE |
2748 | // dwarf stuff: success: rewrites to a function; failure: retains target_symbol, sets saved_conversion_error |
2749 | // | |
2750 | // sdt-kprobes sdt.h: success: string or functioncall; failure: semantic_error | |
2751 | // | |
2752 | // sdt-uprobes: success: string or no op; failure: no op; expect derived/synthetic | |
2753 | // dwarf probe to take care of it. | |
2754 | // But this is rather unhelpful. So we rig the sdt_var_expanding_visitor | |
2755 | // to pass through @defined() to the synthetic dwarf probe. | |
780f11ff | 2756 | // |
30263a73 FCE |
2757 | // utrace: success: rewrites to function; failure: semantic_error |
2758 | // | |
850bfddd | 2759 | // procfs: success: rewrites to function; failure: semantic_error |
30263a73 FCE |
2760 | |
2761 | target_symbol* foo2 = dynamic_cast<target_symbol*> (foo1); | |
c69a87e0 | 2762 | if (foo2 && foo2->saved_conversion_error) // failing |
30263a73 | 2763 | resolved = false; |
a45664f4 | 2764 | else if (foo2) // unresolved but not marked failing |
b7aedf26 | 2765 | { |
780f11ff JS |
2766 | // There are some visitors that won't touch certain target_symbols, |
2767 | // e.g. dwarf_var_expanding_visitor won't resolve @cast. We should | |
2768 | // leave it for now so some other visitor can have a chance. | |
b7aedf26 JS |
2769 | e->operand = foo2; |
2770 | provide (e); | |
2771 | return; | |
2772 | } | |
30263a73 FCE |
2773 | else // resolved, rewritten to some other expression type |
2774 | resolved = true; | |
780f11ff | 2775 | } catch (const semantic_error& e) { |
c69a87e0 | 2776 | assert (0); // should not happen |
30263a73 FCE |
2777 | } |
2778 | defined_ops.pop (); | |
2779 | ||
2780 | literal_number* ln = new literal_number (resolved ? 1 : 0); | |
2781 | ln->tok = e->tok; | |
2782 | provide (ln); | |
2783 | } | |
2784 | ||
2785 | ||
5f36109e JS |
2786 | struct dwarf_pretty_print |
2787 | { | |
2788 | dwarf_pretty_print (dwflpp& dw, vector<Dwarf_Die>& scopes, Dwarf_Addr pc, | |
2789 | const string& local, bool userspace_p, | |
2790 | const target_symbol& e): | |
d19a9a82 JS |
2791 | dw(dw), local(local), scopes(scopes), pc(pc), pointer(NULL), |
2792 | userspace_p(userspace_p), deref_p(true) | |
5f36109e JS |
2793 | { |
2794 | init_ts (e); | |
2795 | dw.type_die_for_local (scopes, pc, local, ts, &base_type); | |
2796 | } | |
2797 | ||
2798 | dwarf_pretty_print (dwflpp& dw, Dwarf_Die *scope_die, Dwarf_Addr pc, | |
2799 | bool userspace_p, const target_symbol& e): | |
d19a9a82 JS |
2800 | dw(dw), scopes(1, *scope_die), pc(pc), pointer(NULL), |
2801 | userspace_p(userspace_p), deref_p(true) | |
5f36109e JS |
2802 | { |
2803 | init_ts (e); | |
2804 | dw.type_die_for_return (&scopes[0], pc, ts, &base_type); | |
2805 | } | |
2806 | ||
2807 | dwarf_pretty_print (dwflpp& dw, Dwarf_Die *type_die, expression* pointer, | |
d19a9a82 | 2808 | bool deref_p, bool userspace_p, const target_symbol& e): |
5f36109e | 2809 | dw(dw), pc(0), pointer(pointer), pointer_type(*type_die), |
d19a9a82 | 2810 | userspace_p(userspace_p), deref_p(deref_p) |
5f36109e JS |
2811 | { |
2812 | init_ts (e); | |
2813 | dw.type_die_for_pointer (type_die, ts, &base_type); | |
2814 | } | |
2815 | ||
2816 | functioncall* expand (); | |
ce83ff57 | 2817 | ~dwarf_pretty_print () { delete ts; } |
5f36109e JS |
2818 | |
2819 | private: | |
2820 | dwflpp& dw; | |
2821 | target_symbol* ts; | |
7d11d8c9 | 2822 | bool print_full; |
5f36109e JS |
2823 | Dwarf_Die base_type; |
2824 | ||
2825 | string local; | |
2826 | vector<Dwarf_Die> scopes; | |
2827 | Dwarf_Addr pc; | |
2828 | ||
2829 | expression* pointer; | |
2830 | Dwarf_Die pointer_type; | |
2831 | ||
d19a9a82 | 2832 | const bool userspace_p, deref_p; |
5f36109e JS |
2833 | |
2834 | void recurse (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2835 | print_format* pf, bool top=false); |
600551ca JS |
2836 | void recurse_bitfield (Dwarf_Die* type, target_symbol* e, |
2837 | print_format* pf); | |
5f36109e | 2838 | void recurse_base (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2839 | print_format* pf); |
5f36109e | 2840 | void recurse_array (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2841 | print_format* pf, bool top); |
5f36109e | 2842 | void recurse_pointer (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2843 | print_format* pf, bool top); |
5f36109e | 2844 | void recurse_struct (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2845 | print_format* pf, bool top); |
5f36109e | 2846 | void recurse_struct_members (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2847 | print_format* pf, int& count); |
bbee5bb8 | 2848 | bool print_chars (Dwarf_Die* type, target_symbol* e, print_format* pf); |
5f36109e JS |
2849 | |
2850 | void init_ts (const target_symbol& e); | |
2851 | expression* deref (target_symbol* e); | |
c55ea10d | 2852 | bool push_deref (print_format* pf, const string& fmt, target_symbol* e); |
5f36109e JS |
2853 | }; |
2854 | ||
2855 | ||
2856 | void | |
2857 | dwarf_pretty_print::init_ts (const target_symbol& e) | |
2858 | { | |
2859 | // Work with a new target_symbol so we can modify arguments | |
2860 | ts = new target_symbol (e); | |
2861 | ||
2862 | if (ts->addressof) | |
dc09353a | 2863 | throw SEMANTIC_ERROR(_("cannot take address of pretty-printed variable"), ts->tok); |
5f36109e JS |
2864 | |
2865 | if (ts->components.empty() || | |
2866 | ts->components.back().type != target_symbol::comp_pretty_print) | |
dc09353a | 2867 | throw SEMANTIC_ERROR(_("invalid target_symbol for pretty-print"), ts->tok); |
7d11d8c9 | 2868 | print_full = ts->components.back().member.length() > 1; |
5f36109e JS |
2869 | ts->components.pop_back(); |
2870 | } | |
2871 | ||
2872 | ||
2873 | functioncall* | |
2874 | dwarf_pretty_print::expand () | |
2875 | { | |
2876 | static unsigned tick = 0; | |
2877 | ||
2878 | // function pretty_print_X([pointer], [arg1, arg2, ...]) { | |
7d11d8c9 JS |
2879 | // try { |
2880 | // return sprintf("{.foo=...}", (ts)->foo, ...) | |
2881 | // } catch { | |
2882 | // return "ERROR" | |
2883 | // } | |
5f36109e JS |
2884 | // } |
2885 | ||
2886 | // Create the function decl and call. | |
2887 | ||
2888 | functiondecl *fdecl = new functiondecl; | |
2889 | fdecl->tok = ts->tok; | |
2890 | fdecl->synthetic = true; | |
2891 | fdecl->name = "_dwarf_pretty_print_" + lex_cast(tick++); | |
2892 | fdecl->type = pe_string; | |
2893 | ||
2894 | functioncall* fcall = new functioncall; | |
2895 | fcall->tok = ts->tok; | |
2896 | fcall->function = fdecl->name; | |
140be17a | 2897 | fcall->type = pe_string; |
5f36109e JS |
2898 | |
2899 | // If there's a <pointer>, replace it with a new var and make that | |
2900 | // the first function argument. | |
2901 | if (pointer) | |
2902 | { | |
2903 | vardecl *v = new vardecl; | |
2904 | v->type = pe_long; | |
2905 | v->name = "pointer"; | |
2906 | v->tok = ts->tok; | |
2907 | fdecl->formal_args.push_back (v); | |
2908 | fcall->args.push_back (pointer); | |
2909 | ||
2910 | symbol* sym = new symbol; | |
2911 | sym->tok = ts->tok; | |
2912 | sym->name = v->name; | |
5f36109e JS |
2913 | pointer = sym; |
2914 | } | |
2915 | ||
2916 | // For each expression argument, replace it with a function argument. | |
2917 | for (unsigned i = 0; i < ts->components.size(); ++i) | |
2918 | if (ts->components[i].type == target_symbol::comp_expression_array_index) | |
2919 | { | |
2920 | vardecl *v = new vardecl; | |
2921 | v->type = pe_long; | |
2922 | v->name = "index" + lex_cast(i); | |
2923 | v->tok = ts->tok; | |
2924 | fdecl->formal_args.push_back (v); | |
2925 | fcall->args.push_back (ts->components[i].expr_index); | |
2926 | ||
2927 | symbol* sym = new symbol; | |
2928 | sym->tok = ts->tok; | |
2929 | sym->name = v->name; | |
5f36109e JS |
2930 | ts->components[i].expr_index = sym; |
2931 | } | |
2932 | ||
2933 | // Create the return sprintf. | |
1c922ad7 | 2934 | print_format* pf = print_format::create(ts->tok, "sprintf"); |
5f36109e JS |
2935 | return_statement* rs = new return_statement; |
2936 | rs->tok = ts->tok; | |
2937 | rs->value = pf; | |
5f36109e JS |
2938 | |
2939 | // Recurse into the actual values. | |
7d11d8c9 | 2940 | recurse (&base_type, ts, pf, true); |
5f36109e JS |
2941 | pf->components = print_format::string_to_components(pf->raw_components); |
2942 | ||
7d11d8c9 JS |
2943 | // Create the try-catch net |
2944 | try_block* tb = new try_block; | |
2945 | tb->tok = ts->tok; | |
2946 | tb->try_block = rs; | |
2947 | tb->catch_error_var = 0; | |
2948 | return_statement* rs2 = new return_statement; | |
2949 | rs2->tok = ts->tok; | |
2950 | rs2->value = new literal_string ("ERROR"); | |
2951 | rs2->value->tok = ts->tok; | |
2952 | tb->catch_block = rs2; | |
2953 | fdecl->body = tb; | |
2954 | ||
f8809d54 | 2955 | fdecl->join (dw.sess); |
5f36109e JS |
2956 | return fcall; |
2957 | } | |
2958 | ||
2959 | ||
2960 | void | |
2961 | dwarf_pretty_print::recurse (Dwarf_Die* start_type, target_symbol* e, | |
7d11d8c9 | 2962 | print_format* pf, bool top) |
5f36109e JS |
2963 | { |
2964 | Dwarf_Die type; | |
2965 | dw.resolve_unqualified_inner_typedie (start_type, &type, e); | |
2966 | ||
2967 | switch (dwarf_tag(&type)) | |
2968 | { | |
2969 | default: | |
2970 | // XXX need a warning? | |
2971 | // throw semantic_error ("unsupported type (tag " + lex_cast(dwarf_tag(&type)) | |
2972 | // + ") for " + dwarf_type_name(&type), e->tok); | |
2973 | pf->raw_components.append("?"); | |
2974 | break; | |
2975 | ||
2976 | case DW_TAG_enumeration_type: | |
2977 | case DW_TAG_base_type: | |
7d11d8c9 | 2978 | recurse_base (&type, e, pf); |
5f36109e JS |
2979 | break; |
2980 | ||
2981 | case DW_TAG_array_type: | |
7d11d8c9 | 2982 | recurse_array (&type, e, pf, top); |
5f36109e JS |
2983 | break; |
2984 | ||
2985 | case DW_TAG_pointer_type: | |
2986 | case DW_TAG_reference_type: | |
2987 | case DW_TAG_rvalue_reference_type: | |
7d11d8c9 | 2988 | recurse_pointer (&type, e, pf, top); |
5f36109e JS |
2989 | break; |
2990 | ||
2991 | case DW_TAG_subroutine_type: | |
c55ea10d | 2992 | push_deref (pf, "<function>:%p", e); |
5f36109e JS |
2993 | break; |
2994 | ||
2995 | case DW_TAG_union_type: | |
5f36109e JS |
2996 | case DW_TAG_structure_type: |
2997 | case DW_TAG_class_type: | |
7d11d8c9 | 2998 | recurse_struct (&type, e, pf, top); |
5f36109e JS |
2999 | break; |
3000 | } | |
3001 | } | |
3002 | ||
3003 | ||
600551ca JS |
3004 | // Bit fields are handled as a special-case combination of recurse() and |
3005 | // recurse_base(), only called from recurse_struct_members(). The main | |
3006 | // difference is that the value is always printed numerically, even if the | |
3007 | // underlying type is a char. | |
3008 | void | |
3009 | dwarf_pretty_print::recurse_bitfield (Dwarf_Die* start_type, target_symbol* e, | |
3010 | print_format* pf) | |
3011 | { | |
3012 | Dwarf_Die type; | |
3013 | dw.resolve_unqualified_inner_typedie (start_type, &type, e); | |
3014 | ||
3015 | int tag = dwarf_tag(&type); | |
3016 | if (tag != DW_TAG_base_type && tag != DW_TAG_enumeration_type) | |
3017 | { | |
3018 | // XXX need a warning? | |
3019 | // throw semantic_error ("unsupported bitfield type (tag " + lex_cast(tag) | |
3020 | // + ") for " + dwarf_type_name(&type), e->tok); | |
3021 | pf->raw_components.append("?"); | |
3022 | return; | |
3023 | } | |
3024 | ||
3025 | Dwarf_Attribute attr; | |
3026 | Dwarf_Word encoding = (Dwarf_Word) -1; | |
3027 | dwarf_formudata (dwarf_attr_integrate (&type, DW_AT_encoding, &attr), | |
3028 | &encoding); | |
3029 | switch (encoding) | |
3030 | { | |
3031 | case DW_ATE_float: | |
3032 | case DW_ATE_complex_float: | |
3033 | // XXX need a warning? | |
3034 | // throw semantic_error ("unsupported bitfield type (encoding " + lex_cast(encoding) | |
3035 | // + ") for " + dwarf_type_name(&type), e->tok); | |
3036 | pf->raw_components.append("?"); | |
3037 | break; | |
3038 | ||
3039 | case DW_ATE_unsigned: | |
3040 | case DW_ATE_unsigned_char: | |
3041 | push_deref (pf, "%u", e); | |
3042 | break; | |
3043 | ||
3044 | case DW_ATE_signed: | |
3045 | case DW_ATE_signed_char: | |
3046 | default: | |
3047 | push_deref (pf, "%i", e); | |
3048 | break; | |
3049 | } | |
3050 | } | |
3051 | ||
3052 | ||
5f36109e JS |
3053 | void |
3054 | dwarf_pretty_print::recurse_base (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 3055 | print_format* pf) |
5f36109e JS |
3056 | { |
3057 | Dwarf_Attribute attr; | |
3058 | Dwarf_Word encoding = (Dwarf_Word) -1; | |
3059 | dwarf_formudata (dwarf_attr_integrate (type, DW_AT_encoding, &attr), | |
3060 | &encoding); | |
5f36109e JS |
3061 | switch (encoding) |
3062 | { | |
3063 | case DW_ATE_float: | |
3064 | case DW_ATE_complex_float: | |
3065 | // XXX need a warning? | |
3066 | // throw semantic_error ("unsupported type (encoding " + lex_cast(encoding) | |
3067 | // + ") for " + dwarf_type_name(type), e->tok); | |
3068 | pf->raw_components.append("?"); | |
5f36109e JS |
3069 | break; |
3070 | ||
6561d8d1 | 3071 | case DW_ATE_UTF: // XXX need to add unicode to _stp_vsprint_char |
5f36109e JS |
3072 | case DW_ATE_signed_char: |
3073 | case DW_ATE_unsigned_char: | |
941101c1 JS |
3074 | // Use escapes to make sure that non-printable characters |
3075 | // don't interrupt our stream (especially '\0' values). | |
3076 | push_deref (pf, "'%#c'", e); | |
5f36109e JS |
3077 | break; |
3078 | ||
3079 | case DW_ATE_unsigned: | |
c55ea10d | 3080 | push_deref (pf, "%u", e); |
5f36109e JS |
3081 | break; |
3082 | ||
600551ca | 3083 | case DW_ATE_signed: |
5f36109e | 3084 | default: |
c55ea10d | 3085 | push_deref (pf, "%i", e); |
5f36109e JS |
3086 | break; |
3087 | } | |
5f36109e JS |
3088 | } |
3089 | ||
3090 | ||
3091 | void | |
3092 | dwarf_pretty_print::recurse_array (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 3093 | print_format* pf, bool top) |
5f36109e | 3094 | { |
7d11d8c9 JS |
3095 | if (!top && !print_full) |
3096 | { | |
3097 | pf->raw_components.append("[...]"); | |
3098 | return; | |
3099 | } | |
3100 | ||
5f36109e JS |
3101 | Dwarf_Die childtype; |
3102 | dwarf_attr_die (type, DW_AT_type, &childtype); | |
bbee5bb8 JS |
3103 | |
3104 | if (print_chars (&childtype, e, pf)) | |
3105 | return; | |
3106 | ||
5f36109e JS |
3107 | pf->raw_components.append("["); |
3108 | ||
3109 | // We print the array up to the first 5 elements. | |
3110 | // XXX how can we determine the array size? | |
3111 | // ... for now, just print the first element | |
64cddf39 | 3112 | // NB: limit to 32 args; see PR10750 and c_unparser::visit_print_format. |
5f36109e | 3113 | unsigned i, size = 1; |
64cddf39 | 3114 | for (i=0; i < size && i < 5 && pf->args.size() < 32; ++i) |
5f36109e JS |
3115 | { |
3116 | if (i > 0) | |
3117 | pf->raw_components.append(", "); | |
3118 | target_symbol* e2 = new target_symbol(*e); | |
3119 | e2->components.push_back (target_symbol::component(e->tok, i)); | |
7d11d8c9 | 3120 | recurse (&childtype, e2, pf); |
5f36109e JS |
3121 | } |
3122 | if (i < size || 1/*XXX until real size is known */) | |
3123 | pf->raw_components.append(", ..."); | |
3124 | pf->raw_components.append("]"); | |
3125 | } | |
3126 | ||
3127 | ||
3128 | void | |
3129 | dwarf_pretty_print::recurse_pointer (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 3130 | print_format* pf, bool top) |
5f36109e | 3131 | { |
7d11d8c9 | 3132 | // We chase to top-level pointers, but leave the rest alone |
d19a9a82 | 3133 | bool void_p = true; |
7d11d8c9 | 3134 | Dwarf_Die pointee; |
bbee5bb8 | 3135 | if (dwarf_attr_die (type, DW_AT_type, &pointee)) |
d19a9a82 JS |
3136 | { |
3137 | try | |
3138 | { | |
3139 | dw.resolve_unqualified_inner_typedie (&pointee, &pointee, e); | |
3140 | void_p = false; | |
3141 | } | |
3142 | catch (const semantic_error&) {} | |
3143 | } | |
3144 | ||
3145 | if (!void_p) | |
5f36109e | 3146 | { |
bbee5bb8 JS |
3147 | if (print_chars (&pointee, e, pf)) |
3148 | return; | |
3149 | ||
3150 | if (top) | |
3151 | { | |
3152 | recurse (&pointee, e, pf, top); | |
3153 | return; | |
3154 | } | |
5f36109e | 3155 | } |
bbee5bb8 | 3156 | |
c55ea10d | 3157 | push_deref (pf, "%p", e); |
5f36109e JS |
3158 | } |
3159 | ||
3160 | ||
3161 | void | |
3162 | dwarf_pretty_print::recurse_struct (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 3163 | print_format* pf, bool top) |
5f36109e | 3164 | { |
bdec0e18 JS |
3165 | if (dwarf_hasattr(type, DW_AT_declaration)) |
3166 | { | |
a44a7cb5 | 3167 | Dwarf_Die *resolved = dw.declaration_resolve(type); |
bdec0e18 JS |
3168 | if (!resolved) |
3169 | { | |
3170 | // could be an error, but for now just stub it | |
3171 | // throw semantic_error ("unresolved " + dwarf_type_name(type), e->tok); | |
3172 | pf->raw_components.append("{...}"); | |
3173 | return; | |
3174 | } | |
3175 | type = resolved; | |
3176 | } | |
3177 | ||
5f36109e JS |
3178 | int count = 0; |
3179 | pf->raw_components.append("{"); | |
7d11d8c9 JS |
3180 | if (top || print_full) |
3181 | recurse_struct_members (type, e, pf, count); | |
3182 | else | |
3183 | pf->raw_components.append("..."); | |
5f36109e JS |
3184 | pf->raw_components.append("}"); |
3185 | } | |
3186 | ||
3187 | ||
3188 | void | |
3189 | dwarf_pretty_print::recurse_struct_members (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 3190 | print_format* pf, int& count) |
5f36109e | 3191 | { |
a80f28d8 JS |
3192 | /* With inheritance, a subclass may mask member names of parent classes, so |
3193 | * our search among the inheritance tree must be breadth-first rather than | |
3194 | * depth-first (recursive). The type die is still our starting point. When | |
3195 | * we encounter a masked name, just skip it. */ | |
3196 | set<string> dupes; | |
3197 | deque<Dwarf_Die> inheritees(1, *type); | |
3198 | for (; !inheritees.empty(); inheritees.pop_front()) | |
3199 | { | |
dee830d9 | 3200 | Dwarf_Die child, childtype, import; |
a80f28d8 JS |
3201 | if (dwarf_child (&inheritees.front(), &child) == 0) |
3202 | do | |
3203 | { | |
3204 | target_symbol* e2 = e; | |
5f36109e | 3205 | |
a80f28d8 JS |
3206 | // skip static members |
3207 | if (dwarf_hasattr(&child, DW_AT_declaration)) | |
3208 | continue; | |
5f36109e | 3209 | |
a80f28d8 | 3210 | int tag = dwarf_tag (&child); |
5f36109e | 3211 | |
dee830d9 MW |
3212 | /* Pretend imported units contain members by recursing into |
3213 | struct_member printing with the same count. */ | |
3214 | if (tag == DW_TAG_imported_unit | |
3215 | && dwarf_attr_die (&child, DW_AT_import, &import)) | |
3216 | recurse_struct_members (&import, e2, pf, count); | |
3217 | ||
a80f28d8 JS |
3218 | if (tag != DW_TAG_member && tag != DW_TAG_inheritance) |
3219 | continue; | |
5f36109e | 3220 | |
a80f28d8 | 3221 | dwarf_attr_die (&child, DW_AT_type, &childtype); |
5f36109e | 3222 | |
a80f28d8 JS |
3223 | if (tag == DW_TAG_inheritance) |
3224 | { | |
3225 | inheritees.push_back(childtype); | |
3226 | continue; | |
3227 | } | |
5f36109e | 3228 | |
a80f28d8 JS |
3229 | int childtag = dwarf_tag (&childtype); |
3230 | const char *member = dwarf_diename (&child); | |
3a147004 | 3231 | |
a80f28d8 JS |
3232 | // "_vptr.foo" members are C++ virtual function tables, |
3233 | // which (generally?) aren't interesting for users. | |
3234 | if (member && startswith(member, "_vptr.")) | |
3235 | continue; | |
3a147004 | 3236 | |
a80f28d8 JS |
3237 | // skip inheritance-masked duplicates |
3238 | if (member && !dupes.insert(member).second) | |
3239 | continue; | |
64cddf39 | 3240 | |
a80f28d8 JS |
3241 | if (++count > 1) |
3242 | pf->raw_components.append(", "); | |
64cddf39 | 3243 | |
a80f28d8 JS |
3244 | // NB: limit to 32 args; see PR10750 and c_unparser::visit_print_format. |
3245 | if (pf->args.size() >= 32) | |
3246 | { | |
3247 | pf->raw_components.append("..."); | |
3248 | break; | |
3249 | } | |
3250 | ||
3251 | if (member) | |
3252 | { | |
3253 | pf->raw_components.append("."); | |
3254 | pf->raw_components.append(member); | |
5f36109e | 3255 | |
a80f28d8 JS |
3256 | e2 = new target_symbol(*e); |
3257 | e2->components.push_back (target_symbol::component(e->tok, member)); | |
3258 | } | |
3259 | else if (childtag == DW_TAG_union_type) | |
3260 | pf->raw_components.append("<union>"); | |
3261 | else if (childtag == DW_TAG_structure_type) | |
3262 | pf->raw_components.append("<class>"); | |
3263 | else if (childtag == DW_TAG_class_type) | |
3264 | pf->raw_components.append("<struct>"); | |
3265 | pf->raw_components.append("="); | |
600551ca JS |
3266 | |
3267 | if (dwarf_hasattr_integrate (&child, DW_AT_bit_offset)) | |
3268 | recurse_bitfield (&childtype, e2, pf); | |
3269 | else | |
3270 | recurse (&childtype, e2, pf); | |
5f36109e | 3271 | } |
a80f28d8 JS |
3272 | while (dwarf_siblingof (&child, &child) == 0); |
3273 | } | |
5f36109e JS |
3274 | } |
3275 | ||
3276 | ||
bbee5bb8 JS |
3277 | bool |
3278 | dwarf_pretty_print::print_chars (Dwarf_Die* start_type, target_symbol* e, | |
3279 | print_format* pf) | |
3280 | { | |
3281 | Dwarf_Die type; | |
3282 | dw.resolve_unqualified_inner_typedie (start_type, &type, e); | |
6561d8d1 JS |
3283 | |
3284 | Dwarf_Attribute attr; | |
3285 | Dwarf_Word encoding = (Dwarf_Word) -1; | |
3286 | dwarf_formudata (dwarf_attr_integrate (&type, DW_AT_encoding, &attr), | |
3287 | &encoding); | |
3288 | switch (encoding) | |
bbee5bb8 | 3289 | { |
6561d8d1 JS |
3290 | case DW_ATE_UTF: |
3291 | case DW_ATE_signed_char: | |
3292 | case DW_ATE_unsigned_char: | |
3293 | break; | |
3294 | default: | |
3295 | return false; | |
3296 | } | |
3297 | ||
3298 | string function = userspace_p ? "user_string2" : "kernel_string2"; | |
3299 | Dwarf_Word size = (Dwarf_Word) -1; | |
3300 | dwarf_formudata (dwarf_attr_integrate (&type, DW_AT_byte_size, &attr), &size); | |
3301 | switch (size) | |
3302 | { | |
3303 | case 1: | |
3304 | break; | |
3305 | case 2: | |
3306 | function += "_utf16"; | |
3307 | break; | |
3308 | case 4: | |
3309 | function += "_utf32"; | |
3310 | break; | |
3311 | default: | |
3312 | return false; | |
3313 | } | |
3314 | ||
3315 | if (push_deref (pf, "\"%s\"", e)) | |
3316 | { | |
3317 | // steal the last arg for a string access | |
3318 | assert (!pf->args.empty()); | |
3319 | functioncall* fcall = new functioncall; | |
3320 | fcall->tok = e->tok; | |
3321 | fcall->function = function; | |
3322 | fcall->args.push_back (pf->args.back()); | |
3323 | expression *err_msg = new literal_string ("<unknown>"); | |
3324 | err_msg->tok = e->tok; | |
3325 | fcall->args.push_back (err_msg); | |
3326 | pf->args.back() = fcall; | |
bbee5bb8 | 3327 | } |
6561d8d1 | 3328 | return true; |
bbee5bb8 JS |
3329 | } |
3330 | ||
a5ce5211 MW |
3331 | // PR10601: adapt to kernel-vs-userspace loc2c-runtime |
3332 | static const string EMBEDDED_FETCH_DEREF_KERNEL = string("\n") | |
f1e8e7e0 MW |
3333 | + "#define fetch_register k_fetch_register\n" |
3334 | + "#define store_register k_store_register\n" | |
3335 | + "#define deref kderef\n" | |
3336 | + "#define store_deref store_kderef\n"; | |
a5ce5211 MW |
3337 | |
3338 | static const string EMBEDDED_FETCH_DEREF_USER = string("\n") | |
f1e8e7e0 MW |
3339 | + "#define fetch_register u_fetch_register\n" |
3340 | + "#define store_register u_store_register\n" | |
3341 | + "#define deref uderef\n" | |
3342 | + "#define store_deref store_uderef\n"; | |
a5ce5211 MW |
3343 | |
3344 | #define EMBEDDED_FETCH_DEREF(U) \ | |
f1e8e7e0 | 3345 | (U ? EMBEDDED_FETCH_DEREF_USER : EMBEDDED_FETCH_DEREF_KERNEL) |
a5ce5211 MW |
3346 | |
3347 | static const string EMBEDDED_FETCH_DEREF_DONE = string("\n") | |
f1e8e7e0 MW |
3348 | + "#undef fetch_register\n" |
3349 | + "#undef store_register\n" | |
3350 | + "#undef deref\n" | |
3351 | + "#undef store_deref\n"; | |
bbee5bb8 | 3352 | |
1c0be8c7 JS |
3353 | static functioncall* |
3354 | synthetic_embedded_deref_call(systemtap_session& session, | |
3355 | const string& function_name, | |
3356 | const string& function_code, | |
3357 | exp_type function_type, | |
3358 | bool userspace_p, | |
3359 | bool lvalue_p, | |
3360 | target_symbol* e, | |
3361 | expression* pointer=NULL) | |
3362 | { | |
3363 | // Synthesize a functiondecl for the given embedded code string. | |
5f36109e JS |
3364 | functiondecl *fdecl = new functiondecl; |
3365 | fdecl->synthetic = true; | |
3366 | fdecl->tok = e->tok; | |
1c0be8c7 JS |
3367 | fdecl->name = function_name; |
3368 | fdecl->type = function_type; | |
3369 | ||
5f36109e JS |
3370 | embeddedcode *ec = new embeddedcode; |
3371 | ec->tok = e->tok; | |
1c0be8c7 JS |
3372 | ec->code += "/* unprivileged */"; |
3373 | if (! lvalue_p) | |
3374 | ec->code += "/* pure */"; | |
3375 | ec->code += EMBEDDED_FETCH_DEREF(userspace_p); | |
3376 | ec->code += function_code; | |
3377 | ec->code += EMBEDDED_FETCH_DEREF_DONE; | |
5f36109e JS |
3378 | fdecl->body = ec; |
3379 | ||
3380 | // Synthesize a functioncall. | |
3381 | functioncall* fcall = new functioncall; | |
3382 | fcall->tok = e->tok; | |
3383 | fcall->function = fdecl->name; | |
1c0be8c7 | 3384 | fcall->type = fdecl->type; |
5f36109e | 3385 | |
1c0be8c7 JS |
3386 | // If this code snippet uses a precomputed pointer, |
3387 | // pass that as the first argument. | |
5f36109e JS |
3388 | if (pointer) |
3389 | { | |
5f36109e JS |
3390 | vardecl *v = new vardecl; |
3391 | v->type = pe_long; | |
3392 | v->name = "pointer"; | |
3393 | v->tok = e->tok; | |
3394 | fdecl->formal_args.push_back(v); | |
3395 | fcall->args.push_back(pointer); | |
3396 | } | |
5f36109e | 3397 | |
1c0be8c7 | 3398 | // Any non-literal indexes need to be passed as arguments too. |
5f36109e JS |
3399 | for (unsigned i = 0; i < e->components.size(); ++i) |
3400 | if (e->components[i].type == target_symbol::comp_expression_array_index) | |
3401 | { | |
3402 | vardecl *v = new vardecl; | |
3403 | v->type = pe_long; | |
3404 | v->name = "index" + lex_cast(i); | |
3405 | v->tok = e->tok; | |
3406 | fdecl->formal_args.push_back(v); | |
3407 | fcall->args.push_back(e->components[i].expr_index); | |
3408 | } | |
3409 | ||
1c0be8c7 JS |
3410 | // If this code snippet is assigning to an lvalue, |
3411 | // add a final argument for the rvalue. | |
3412 | if (lvalue_p) | |
3413 | { | |
3414 | // Modify the fdecl so it carries a single pe_long formal | |
3415 | // argument called "value". | |
5f36109e | 3416 | |
1c0be8c7 JS |
3417 | // FIXME: For the time being we only support setting target |
3418 | // variables which have base types; these are 'pe_long' in | |
3419 | // stap's type vocabulary. Strings and pointers might be | |
3420 | // reasonable, some day, but not today. | |
5f36109e | 3421 | |
1c0be8c7 JS |
3422 | vardecl *v = new vardecl; |
3423 | v->type = pe_long; | |
3424 | v->name = "value"; | |
3425 | v->tok = e->tok; | |
3426 | fdecl->formal_args.push_back(v); | |
3427 | // NB: We don't know the value for fcall argument yet. | |
3428 | // (see target_symbol_setter_functioncalls) | |
3429 | } | |
3430 | ||
3431 | // Add the synthesized decl to the session, and return the call. | |
3432 | fdecl->join (session); | |
5f36109e JS |
3433 | return fcall; |
3434 | } | |
3435 | ||
1c0be8c7 JS |
3436 | expression* |
3437 | dwarf_pretty_print::deref (target_symbol* e) | |
3438 | { | |
3439 | static unsigned tick = 0; | |
3440 | ||
3441 | if (!deref_p) | |
3442 | { | |
3443 | assert (pointer && e->components.empty()); | |
3444 | return pointer; | |
3445 | } | |
3446 | ||
3447 | bool lvalue_p = false; | |
3448 | string name = "_dwarf_pretty_print_deref_" + lex_cast(tick++); | |
3449 | ||
3450 | string code; | |
3451 | exp_type type = pe_long; | |
3452 | if (pointer) | |
3453 | code = dw.literal_stmt_for_pointer (&pointer_type, e, false, type); | |
3454 | else if (!local.empty()) | |
3455 | code = dw.literal_stmt_for_local (scopes, pc, local, e, false, type); | |
3456 | else | |
3457 | code = dw.literal_stmt_for_return (&scopes[0], pc, e, false, type); | |
3458 | ||
3459 | return synthetic_embedded_deref_call(dw.sess, name, code, type, | |
3460 | userspace_p, lvalue_p, e, pointer); | |
3461 | } | |
3462 | ||
5f36109e | 3463 | |
c55ea10d JS |
3464 | bool |
3465 | dwarf_pretty_print::push_deref (print_format* pf, const string& fmt, | |
3466 | target_symbol* e) | |
3467 | { | |
3468 | expression* e2 = NULL; | |
3469 | try | |
3470 | { | |
3471 | e2 = deref (e); | |
3472 | } | |
3473 | catch (const semantic_error&) | |
3474 | { | |
3475 | pf->raw_components.append ("?"); | |
3476 | return false; | |
3477 | } | |
3478 | pf->raw_components.append (fmt); | |
3479 | pf->args.push_back (e2); | |
3480 | return true; | |
3481 | } | |
3482 | ||
3483 | ||
e57b735a | 3484 | void |
a7999c82 | 3485 | dwarf_var_expanding_visitor::visit_target_symbol_saved_return (target_symbol* e) |
e57b735a | 3486 | { |
a7999c82 JS |
3487 | // Get the full name of the target symbol. |
3488 | stringstream ts_name_stream; | |
3489 | e->print(ts_name_stream); | |
3490 | string ts_name = ts_name_stream.str(); | |
3491 | ||
3492 | // Check and make sure we haven't already seen this target | |
3493 | // variable in this return probe. If we have, just return our | |
3494 | // last replacement. | |
af234c40 | 3495 | map<string, expression *>::iterator i = return_ts_map.find(ts_name); |
a7999c82 | 3496 | if (i != return_ts_map.end()) |
85ecf79a | 3497 | { |
a7999c82 JS |
3498 | provide (i->second); |
3499 | return; | |
3500 | } | |
85ecf79a | 3501 | |
70208613 JS |
3502 | // Attempt the expansion directly first, so if there's a problem with the |
3503 | // variable we won't have a bogus entry probe lying around. Like in | |
3504 | // saveargs(), we pretend for a moment that we're not in a .return. | |
3505 | bool saved_has_return = q.has_return; | |
3506 | q.has_return = false; | |
3507 | expression *repl = e; | |
3508 | replace (repl); | |
3509 | q.has_return = saved_has_return; | |
3510 | target_symbol* n = dynamic_cast<target_symbol*>(repl); | |
3511 | if (n && n->saved_conversion_error) | |
3512 | { | |
3513 | provide (repl); | |
3514 | return; | |
3515 | } | |
3516 | ||
af234c40 JS |
3517 | expression *exp; |
3518 | if (!q.has_process && | |
3519 | strverscmp(q.sess.kernel_base_release.c_str(), "2.6.25") >= 0) | |
140be17a | 3520 | exp = gen_kretprobe_saved_return(repl); |
af234c40 | 3521 | else |
cc9001af | 3522 | exp = gen_mapped_saved_return(repl, e->sym_name()); |
af234c40 JS |
3523 | |
3524 | // Provide the variable to our parent so it can be used as a | |
3525 | // substitute for the target symbol. | |
3526 | provide (exp); | |
3527 | ||
3528 | // Remember this replacement since we might be able to reuse | |
3529 | // it later if the same return probe references this target | |
3530 | // symbol again. | |
3531 | return_ts_map[ts_name] = exp; | |
3532 | } | |
3533 | ||
4a2970a3 | 3534 | static expression* |
23dc94f6 DS |
3535 | gen_mapped_saved_return(systemtap_session &sess, expression* e, |
3536 | const string& name, | |
3537 | block *& add_block, bool& add_block_tid, | |
3538 | block *& add_call_probe, bool& add_call_probe_tid) | |
af234c40 | 3539 | { |
23dc94f6 DS |
3540 | static unsigned tick = 0; |
3541 | ||
a7999c82 JS |
3542 | // We've got to do several things here to handle target |
3543 | // variables in return probes. | |
85ecf79a | 3544 | |
a7999c82 JS |
3545 | // (1) Synthesize two global arrays. One is the cache of the |
3546 | // target variable and the other contains a thread specific | |
3547 | // nesting level counter. The arrays will look like | |
3548 | // this: | |
3549 | // | |
23dc94f6 DS |
3550 | // _entry_tvar_{name}_{num} |
3551 | // _entry_tvar_{name}_{num}_ctr | |
a7999c82 | 3552 | |
23dc94f6 | 3553 | string aname = (string("_entry_tvar_") |
cc9001af | 3554 | + name |
aca66a36 | 3555 | + "_" + lex_cast(tick++)); |
a7999c82 JS |
3556 | vardecl* vd = new vardecl; |
3557 | vd->name = aname; | |
3558 | vd->tok = e->tok; | |
23dc94f6 | 3559 | sess.globals.push_back (vd); |
a7999c82 JS |
3560 | |
3561 | string ctrname = aname + "_ctr"; | |
3562 | vd = new vardecl; | |
3563 | vd->name = ctrname; | |
3564 | vd->tok = e->tok; | |
23dc94f6 | 3565 | sess.globals.push_back (vd); |
a7999c82 JS |
3566 | |
3567 | // (2) Create a new code block we're going to insert at the | |
3568 | // beginning of this probe to get the cached value into a | |
3569 | // temporary variable. We'll replace the target variable | |
3570 | // reference with the temporary variable reference. The code | |
3571 | // will look like this: | |
3572 | // | |
23dc94f6 DS |
3573 | // _entry_tvar_tid = tid() |
3574 | // _entry_tvar_{name}_{num}_tmp | |
3575 | // = _entry_tvar_{name}_{num}[_entry_tvar_tid, | |
3576 | // _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]] | |
3577 | // delete _entry_tvar_{name}_{num}[_entry_tvar_tid, | |
3578 | // _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]--] | |
3579 | // if (! _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]) | |
3580 | // delete _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid] | |
a7999c82 JS |
3581 | |
3582 | // (2a) Synthesize the tid temporary expression, which will look | |
3583 | // like this: | |
3584 | // | |
23dc94f6 | 3585 | // _entry_tvar_tid = tid() |
a7999c82 | 3586 | symbol* tidsym = new symbol; |
23dc94f6 | 3587 | tidsym->name = string("_entry_tvar_tid"); |
a7999c82 | 3588 | tidsym->tok = e->tok; |
85ecf79a | 3589 | |
a7999c82 JS |
3590 | if (add_block == NULL) |
3591 | { | |
3592 | add_block = new block; | |
3593 | add_block->tok = e->tok; | |
8cc799a5 | 3594 | } |
8c819921 | 3595 | |
8cc799a5 JS |
3596 | if (!add_block_tid) |
3597 | { | |
a7999c82 JS |
3598 | // Synthesize a functioncall to grab the thread id. |
3599 | functioncall* fc = new functioncall; | |
3600 | fc->tok = e->tok; | |
3601 | fc->function = string("tid"); | |
8c819921 | 3602 | |
23dc94f6 | 3603 | // Assign the tid to '_entry_tvar_tid'. |
8c819921 DS |
3604 | assignment* a = new assignment; |
3605 | a->tok = e->tok; | |
3606 | a->op = "="; | |
a7999c82 JS |
3607 | a->left = tidsym; |
3608 | a->right = fc; | |
8c819921 DS |
3609 | |
3610 | expr_statement* es = new expr_statement; | |
3611 | es->tok = e->tok; | |
3612 | es->value = a; | |
8c819921 | 3613 | add_block->statements.push_back (es); |
8cc799a5 | 3614 | add_block_tid = true; |
a7999c82 | 3615 | } |
8c819921 | 3616 | |
a7999c82 JS |
3617 | // (2b) Synthesize an array reference and assign it to a |
3618 | // temporary variable (that we'll use as replacement for the | |
3619 | // target variable reference). It will look like this: | |
3620 | // | |
23dc94f6 DS |
3621 | // _entry_tvar_{name}_{num}_tmp |
3622 | // = _entry_tvar_{name}_{num}[_entry_tvar_tid, | |
3623 | // _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]] | |
a7999c82 JS |
3624 | |
3625 | arrayindex* ai_tvar_base = new arrayindex; | |
3626 | ai_tvar_base->tok = e->tok; | |
3627 | ||
3628 | symbol* sym = new symbol; | |
3629 | sym->name = aname; | |
3630 | sym->tok = e->tok; | |
3631 | ai_tvar_base->base = sym; | |
3632 | ||
3633 | ai_tvar_base->indexes.push_back(tidsym); | |
3634 | ||
3635 | // We need to create a copy of the array index in its current | |
3636 | // state so we can have 2 variants of it (the original and one | |
3637 | // that post-decrements the second index). | |
3638 | arrayindex* ai_tvar = new arrayindex; | |
3639 | arrayindex* ai_tvar_postdec = new arrayindex; | |
3640 | *ai_tvar = *ai_tvar_base; | |
3641 | *ai_tvar_postdec = *ai_tvar_base; | |
3642 | ||
3643 | // Synthesize the | |
23dc94f6 | 3644 | // "_entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]" used as the |
a7999c82 JS |
3645 | // second index into the array. |
3646 | arrayindex* ai_ctr = new arrayindex; | |
3647 | ai_ctr->tok = e->tok; | |
3648 | ||
3649 | sym = new symbol; | |
3650 | sym->name = ctrname; | |
3651 | sym->tok = e->tok; | |
3652 | ai_ctr->base = sym; | |
3653 | ai_ctr->indexes.push_back(tidsym); | |
3654 | ai_tvar->indexes.push_back(ai_ctr); | |
3655 | ||
3656 | symbol* tmpsym = new symbol; | |
3657 | tmpsym->name = aname + "_tmp"; | |
3658 | tmpsym->tok = e->tok; | |
3659 | ||
3660 | assignment* a = new assignment; | |
3661 | a->tok = e->tok; | |
3662 | a->op = "="; | |
3663 | a->left = tmpsym; | |
3664 | a->right = ai_tvar; | |
3665 | ||
3666 | expr_statement* es = new expr_statement; | |
3667 | es->tok = e->tok; | |
3668 | es->value = a; | |
3669 | ||
3670 | add_block->statements.push_back (es); | |
3671 | ||
3672 | // (2c) Add a post-decrement to the second array index and | |
3673 | // delete the array value. It will look like this: | |
3674 | // | |
23dc94f6 DS |
3675 | // delete _entry_tvar_{name}_{num}[_entry_tvar_tid, |
3676 | // _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]--] | |
a7999c82 JS |
3677 | |
3678 | post_crement* pc = new post_crement; | |
3679 | pc->tok = e->tok; | |
3680 | pc->op = "--"; | |
3681 | pc->operand = ai_ctr; | |
3682 | ai_tvar_postdec->indexes.push_back(pc); | |
3683 | ||
3684 | delete_statement* ds = new delete_statement; | |
3685 | ds->tok = e->tok; | |
3686 | ds->value = ai_tvar_postdec; | |
3687 | ||
3688 | add_block->statements.push_back (ds); | |
3689 | ||
3690 | // (2d) Delete the counter value if it is 0. It will look like | |
3691 | // this: | |
23dc94f6 DS |
3692 | // if (! _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]) |
3693 | // delete _entry_tvar_{name}_{num}_ctr[_entry_tvar_tid] | |
a7999c82 JS |
3694 | |
3695 | ds = new delete_statement; | |
3696 | ds->tok = e->tok; | |
3697 | ds->value = ai_ctr; | |
3698 | ||
3699 | unary_expression *ue = new unary_expression; | |
3700 | ue->tok = e->tok; | |
3701 | ue->op = "!"; | |
3702 | ue->operand = ai_ctr; | |
3703 | ||
3704 | if_statement *ifs = new if_statement; | |
3705 | ifs->tok = e->tok; | |
3706 | ifs->condition = ue; | |
3707 | ifs->thenblock = ds; | |
3708 | ifs->elseblock = NULL; | |
3709 | ||
3710 | add_block->statements.push_back (ifs); | |
3711 | ||
3712 | // (3) We need an entry probe that saves the value for us in the | |
3713 | // global array we created. Create the entry probe, which will | |
3714 | // look like this: | |
3715 | // | |
2260f4e3 | 3716 | // probe kernel.function("{function}").call { |
23dc94f6 DS |
3717 | // _entry_tvar_tid = tid() |
3718 | // _entry_tvar_{name}_{num}[_entry_tvar_tid, | |
3719 | // ++_entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]] | |
a7999c82 JS |
3720 | // = ${param} |
3721 | // } | |
3722 | ||
2260f4e3 | 3723 | if (add_call_probe == NULL) |
a7999c82 | 3724 | { |
2260f4e3 FCE |
3725 | add_call_probe = new block; |
3726 | add_call_probe->tok = e->tok; | |
8cc799a5 | 3727 | } |
4baf0e53 | 3728 | |
8cc799a5 JS |
3729 | if (!add_call_probe_tid) |
3730 | { | |
a7999c82 JS |
3731 | // Synthesize a functioncall to grab the thread id. |
3732 | functioncall* fc = new functioncall; | |
3733 | fc->tok = e->tok; | |
3734 | fc->function = string("tid"); | |
4baf0e53 | 3735 | |
23dc94f6 | 3736 | // Assign the tid to '_entry_tvar_tid'. |
a7999c82 | 3737 | assignment* a = new assignment; |
8fc05e57 DS |
3738 | a->tok = e->tok; |
3739 | a->op = "="; | |
a7999c82 JS |
3740 | a->left = tidsym; |
3741 | a->right = fc; | |
8fc05e57 | 3742 | |
a7999c82 | 3743 | expr_statement* es = new expr_statement; |
8fc05e57 DS |
3744 | es->tok = e->tok; |
3745 | es->value = a; | |
2260f4e3 | 3746 | add_call_probe = new block(add_call_probe, es); |
8cc799a5 | 3747 | add_call_probe_tid = true; |
85ecf79a | 3748 | } |
cf2a1f85 | 3749 | |
a7999c82 | 3750 | // Save the value, like this: |
23dc94f6 DS |
3751 | // _entry_tvar_{name}_{num}[_entry_tvar_tid, |
3752 | // ++_entry_tvar_{name}_{num}_ctr[_entry_tvar_tid]] | |
a7999c82 JS |
3753 | // = ${param} |
3754 | arrayindex* ai_tvar_preinc = new arrayindex; | |
3755 | *ai_tvar_preinc = *ai_tvar_base; | |
3756 | ||
3757 | pre_crement* preinc = new pre_crement; | |
3758 | preinc->tok = e->tok; | |
3759 | preinc->op = "++"; | |
3760 | preinc->operand = ai_ctr; | |
3761 | ai_tvar_preinc->indexes.push_back(preinc); | |
3762 | ||
3763 | a = new assignment; | |
3764 | a->tok = e->tok; | |
3765 | a->op = "="; | |
3766 | a->left = ai_tvar_preinc; | |
3767 | a->right = e; | |
3768 | ||
3769 | es = new expr_statement; | |
3770 | es->tok = e->tok; | |
3771 | es->value = a; | |
3772 | ||
2260f4e3 | 3773 | add_call_probe = new block(add_call_probe, es); |
a7999c82 | 3774 | |
23dc94f6 | 3775 | // (4) Provide the '_entry_tvar_{name}_{num}_tmp' variable to |
a7999c82 JS |
3776 | // our parent so it can be used as a substitute for the target |
3777 | // symbol. | |
3f803f9e | 3778 | delete ai_tvar_base; |
af234c40 JS |
3779 | return tmpsym; |
3780 | } | |
a7999c82 | 3781 | |
af234c40 | 3782 | |
23dc94f6 DS |
3783 | expression* |
3784 | dwarf_var_expanding_visitor::gen_mapped_saved_return(expression* e, | |
3785 | const string& name) | |
3786 | { | |
3787 | return ::gen_mapped_saved_return(q.sess, e, name, add_block, | |
3788 | add_block_tid, add_call_probe, | |
3789 | add_call_probe_tid); | |
3790 | } | |
3791 | ||
3792 | ||
af234c40 | 3793 | expression* |
140be17a | 3794 | dwarf_var_expanding_visitor::gen_kretprobe_saved_return(expression* e) |
af234c40 JS |
3795 | { |
3796 | // The code for this is simple. | |
3797 | // | |
3798 | // .call: | |
3799 | // _set_kretprobe_long(index, $value) | |
3800 | // | |
3801 | // .return: | |
3802 | // _get_kretprobe_long(index) | |
3803 | // | |
3804 | // (or s/long/string/ for things like $$parms) | |
3805 | ||
3806 | unsigned index; | |
3807 | string setfn, getfn; | |
3808 | ||
140be17a JS |
3809 | // We need the caller to predetermine the type of the expression! |
3810 | switch (e->type) | |
af234c40 | 3811 | { |
140be17a | 3812 | case pe_string: |
af234c40 JS |
3813 | index = saved_strings++; |
3814 | setfn = "_set_kretprobe_string"; | |
3815 | getfn = "_get_kretprobe_string"; | |
140be17a JS |
3816 | break; |
3817 | case pe_long: | |
af234c40 JS |
3818 | index = saved_longs++; |
3819 | setfn = "_set_kretprobe_long"; | |
3820 | getfn = "_get_kretprobe_long"; | |
140be17a JS |
3821 | break; |
3822 | default: | |
dc09353a | 3823 | throw SEMANTIC_ERROR(_("unknown type to save in kretprobe"), e->tok); |
af234c40 JS |
3824 | } |
3825 | ||
3826 | // Create the entry code | |
3827 | // _set_kretprobe_{long|string}(index, $value) | |
3828 | ||
3829 | if (add_call_probe == NULL) | |
3830 | { | |
3831 | add_call_probe = new block; | |
3832 | add_call_probe->tok = e->tok; | |
3833 | } | |
3834 | ||
3835 | functioncall* set_fc = new functioncall; | |
3836 | set_fc->tok = e->tok; | |
3837 | set_fc->function = setfn; | |
3838 | set_fc->args.push_back(new literal_number(index)); | |
3839 | set_fc->args.back()->tok = e->tok; | |
3840 | set_fc->args.push_back(e); | |
3841 | ||
3842 | expr_statement* set_es = new expr_statement; | |
3843 | set_es->tok = e->tok; | |
3844 | set_es->value = set_fc; | |
3845 | ||
3846 | add_call_probe->statements.push_back(set_es); | |
3847 | ||
3848 | // Create the return code | |
3849 | // _get_kretprobe_{long|string}(index) | |
3850 | ||
3851 | functioncall* get_fc = new functioncall; | |
3852 | get_fc->tok = e->tok; | |
3853 | get_fc->function = getfn; | |
3854 | get_fc->args.push_back(new literal_number(index)); | |
3855 | get_fc->args.back()->tok = e->tok; | |
3856 | ||
3857 | return get_fc; | |
a7999c82 | 3858 | } |
a43ba433 | 3859 | |
2cb3fe26 | 3860 | |
a7999c82 JS |
3861 | void |
3862 | dwarf_var_expanding_visitor::visit_target_symbol_context (target_symbol* e) | |
3863 | { | |
b78a0fbb | 3864 | if (null_die(scope_die)) { |
04c8e51b JL |
3865 | literal_string *empty = new literal_string(""); |
3866 | empty->tok = e->tok; | |
3867 | provide(empty); | |
a7999c82 | 3868 | return; |
b78a0fbb | 3869 | } |
2cb3fe26 | 3870 | |
5f36109e JS |
3871 | target_symbol *tsym = new target_symbol(*e); |
3872 | ||
fde50242 JS |
3873 | bool pretty = (!e->components.empty() && |
3874 | e->components[0].type == target_symbol::comp_pretty_print); | |
3875 | string format = pretty ? "=%s" : "=%#x"; | |
a43ba433 | 3876 | |
a7999c82 JS |
3877 | // Convert $$parms to sprintf of a list of parms and active local vars |
3878 | // which we recursively evaluate | |
a43ba433 | 3879 | |
1c922ad7 | 3880 | print_format* pf = print_format::create(e->tok, "sprintf"); |
a7999c82 | 3881 | |
277c21bc | 3882 | if (q.has_return && (e->name == "$$return")) |
a7999c82 | 3883 | { |
277c21bc | 3884 | tsym->name = "$return"; |
a7999c82 JS |
3885 | |
3886 | // Ignore any variable that isn't accessible. | |
3887 | tsym->saved_conversion_error = 0; | |
3888 | expression *texp = tsym; | |
8b095b45 | 3889 | replace (texp); // NB: throws nothing ... |
a7999c82 | 3890 | if (tsym->saved_conversion_error) // ... but this is how we know it happened. |
a43ba433 | 3891 | { |
2cb3fe26 | 3892 | |
a43ba433 FCE |
3893 | } |
3894 | else | |
3895 | { | |
a7999c82 | 3896 | pf->raw_components += "return"; |
5f36109e | 3897 | pf->raw_components += format; |
a7999c82 JS |
3898 | pf->args.push_back(texp); |
3899 | } | |
3900 | } | |
3901 | else | |
3902 | { | |
3903 | // non-.return probe: support $$parms, $$vars, $$locals | |
345bbb3d | 3904 | bool first = true; |
a7999c82 | 3905 | Dwarf_Die result; |
d48bc7eb JS |
3906 | vector<Dwarf_Die> scopes = q.dw.getscopes(scope_die); |
3907 | for (unsigned i = 0; i < scopes.size(); ++i) | |
3908 | { | |
3909 | if (dwarf_tag(&scopes[i]) == DW_TAG_compile_unit) | |
3910 | break; // we don't want file-level variables | |
3911 | if (dwarf_child (&scopes[i], &result) == 0) | |
3912 | do | |
00cf3709 | 3913 | { |
d48bc7eb JS |
3914 | switch (dwarf_tag (&result)) |
3915 | { | |
3916 | case DW_TAG_variable: | |
3917 | if (e->name == "$$parms") | |
3918 | continue; | |
3919 | break; | |
3920 | case DW_TAG_formal_parameter: | |
3921 | if (e->name == "$$locals") | |
3922 | continue; | |
3923 | break; | |
3924 | ||
3925 | default: | |
3926 | continue; | |
3927 | } | |
41c262f3 | 3928 | |
d48bc7eb JS |
3929 | const char *diename = dwarf_diename (&result); |
3930 | if (! diename) continue; | |
f76427a2 | 3931 | |
d48bc7eb JS |
3932 | if (! first) |
3933 | pf->raw_components += " "; | |
3934 | pf->raw_components += diename; | |
fde50242 JS |
3935 | first = false; |
3936 | ||
3937 | // Write a placeholder for ugly aggregates | |
3938 | Dwarf_Die type; | |
3939 | if (!pretty && dwarf_attr_die(&result, DW_AT_type, &type)) | |
3940 | { | |
3941 | q.dw.resolve_unqualified_inner_typedie(&type, &type, e); | |
3942 | switch (dwarf_tag(&type)) | |
3943 | { | |
3944 | case DW_TAG_union_type: | |
3945 | case DW_TAG_structure_type: | |
3946 | case DW_TAG_class_type: | |
3947 | pf->raw_components += "={...}"; | |
3948 | continue; | |
3949 | ||
3950 | case DW_TAG_array_type: | |
3951 | pf->raw_components += "=[...]"; | |
3952 | continue; | |
3953 | } | |
3954 | } | |
345bbb3d | 3955 | |
d48bc7eb JS |
3956 | tsym->name = "$"; |
3957 | tsym->name += diename; | |
41c262f3 | 3958 | |
d48bc7eb JS |
3959 | // Ignore any variable that isn't accessible. |
3960 | tsym->saved_conversion_error = 0; | |
3961 | expression *texp = tsym; | |
3962 | replace (texp); // NB: throws nothing ... | |
3963 | if (tsym->saved_conversion_error) // ... but this is how we know it happened. | |
a43ba433 | 3964 | { |
d48bc7eb JS |
3965 | if (q.sess.verbose>2) |
3966 | { | |
e26c2f83 | 3967 | for (const semantic_error *c = tsym->saved_conversion_error; |
d48bc7eb | 3968 | c != 0; |
c081af73 | 3969 | c = c->get_chain()) { |
4c5d9906 | 3970 | clog << _("variable location problem [man error::dwarf]: ") << c->what() << endl; |
d48bc7eb JS |
3971 | } |
3972 | } | |
3973 | ||
3974 | pf->raw_components += "=?"; | |
a43ba433 | 3975 | } |
d48bc7eb JS |
3976 | else |
3977 | { | |
3978 | pf->raw_components += format; | |
3979 | pf->args.push_back(texp); | |
3980 | } | |
a7999c82 | 3981 | } |
d48bc7eb JS |
3982 | while (dwarf_siblingof (&result, &result) == 0); |
3983 | } | |
a7999c82 | 3984 | } |
2cb3fe26 | 3985 | |
a7999c82 | 3986 | pf->components = print_format::string_to_components(pf->raw_components); |
140be17a | 3987 | pf->type = pe_string; |
a7999c82 JS |
3988 | provide (pf); |
3989 | } | |
3990 | ||
2cb3fe26 | 3991 | |
bd1fcbad YZ |
3992 | void |
3993 | dwarf_var_expanding_visitor::visit_atvar_op (atvar_op *e) | |
3994 | { | |
3995 | // Fill in our current module context if needed | |
3996 | if (e->module.empty()) | |
3997 | e->module = q.dw.module_name; | |
3998 | ||
3999 | if (e->module == q.dw.module_name && e->cu_name.empty()) | |
4000 | { | |
4001 | // process like any other local | |
4002 | // e->sym_name() will do the right thing | |
4003 | visit_target_symbol(e); | |
4004 | return; | |
4005 | } | |
4006 | ||
4007 | var_expanding_visitor::visit_atvar_op(e); | |
4008 | } | |
4009 | ||
4010 | ||
a7999c82 JS |
4011 | void |
4012 | dwarf_var_expanding_visitor::visit_target_symbol (target_symbol *e) | |
4013 | { | |
bd1fcbad | 4014 | assert(e->name.size() > 0 && (e->name[0] == '$' || e->name == "@var")); |
a7999c82 | 4015 | visited = true; |
30263a73 FCE |
4016 | bool defined_being_checked = (defined_ops.size() > 0 && (defined_ops.top()->operand == e)); |
4017 | // In this mode, we avoid hiding errors or generating extra code such as for .return saved $vars | |
a7999c82 | 4018 | |
70208613 | 4019 | try |
a7999c82 | 4020 | { |
c69a87e0 FCE |
4021 | bool lvalue = is_active_lvalue(e); |
4022 | if (lvalue && !q.sess.guru_mode) | |
dc09353a | 4023 | throw SEMANTIC_ERROR(_("write to target variable not permitted; need stap -g"), e->tok); |
2cb3fe26 | 4024 | |
100a540e | 4025 | // XXX: process $context vars should be writable |
70208613 | 4026 | |
c69a87e0 FCE |
4027 | // See if we need to generate a new probe to save/access function |
4028 | // parameters from a return probe. PR 1382. | |
4029 | if (q.has_return | |
4030 | && !defined_being_checked | |
277c21bc JS |
4031 | && e->name != "$return" // not the special return-value variable handled below |
4032 | && e->name != "$$return") // nor the other special variable handled below | |
c69a87e0 FCE |
4033 | { |
4034 | if (lvalue) | |
dc09353a | 4035 | throw SEMANTIC_ERROR(_("write to target variable not permitted in .return probes"), e->tok); |
c69a87e0 FCE |
4036 | visit_target_symbol_saved_return(e); |
4037 | return; | |
4038 | } | |
e57b735a | 4039 | |
277c21bc JS |
4040 | if (e->name == "$$vars" || e->name == "$$parms" || e->name == "$$locals" |
4041 | || (q.has_return && (e->name == "$$return"))) | |
c69a87e0 FCE |
4042 | { |
4043 | if (lvalue) | |
dc09353a | 4044 | throw SEMANTIC_ERROR(_("cannot write to context variable"), e->tok); |
70208613 | 4045 | |
c69a87e0 | 4046 | if (e->addressof) |
dc09353a | 4047 | throw SEMANTIC_ERROR(_("cannot take address of context variable"), e->tok); |
70208613 | 4048 | |
5f36109e JS |
4049 | e->assert_no_components("dwarf", true); |
4050 | ||
c69a87e0 FCE |
4051 | visit_target_symbol_context(e); |
4052 | return; | |
4053 | } | |
70208613 | 4054 | |
04c8e51b JL |
4055 | // Everything else (pretty-printed vars, and context vars) require a |
4056 | // scope_die in which to search for them. If we don't have that, just | |
4057 | // leave it unresolved; we'll produce an error later on. | |
4058 | if (null_die(scope_die)) | |
4059 | { | |
4060 | provide(e); | |
4061 | return; | |
4062 | } | |
4063 | ||
5f36109e JS |
4064 | if (!e->components.empty() && |
4065 | e->components.back().type == target_symbol::comp_pretty_print) | |
4066 | { | |
4067 | if (lvalue) | |
dc09353a | 4068 | throw SEMANTIC_ERROR(_("cannot write to pretty-printed variable"), e->tok); |
5f36109e | 4069 | |
277c21bc | 4070 | if (q.has_return && (e->name == "$return")) |
5f36109e JS |
4071 | { |
4072 | dwarf_pretty_print dpp (q.dw, scope_die, addr, | |
4073 | q.has_process, *e); | |
4074 | dpp.expand()->visit(this); | |
4075 | } | |
4076 | else | |
4077 | { | |
4078 | dwarf_pretty_print dpp (q.dw, getscopes(e), addr, | |
cc9001af | 4079 | e->sym_name(), |
5f36109e JS |
4080 | q.has_process, *e); |
4081 | dpp.expand()->visit(this); | |
4082 | } | |
4083 | return; | |
4084 | } | |
4085 | ||
1c0be8c7 | 4086 | bool userspace_p = q.has_process; |
c69a87e0 | 4087 | string fname = (string(lvalue ? "_dwarf_tvar_set" : "_dwarf_tvar_get") |
cc9001af | 4088 | + "_" + e->sym_name() |
c69a87e0 | 4089 | + "_" + lex_cast(tick++)); |
70208613 | 4090 | |
70208613 | 4091 | |
1c0be8c7 JS |
4092 | exp_type type = pe_long; |
4093 | string code; | |
277c21bc | 4094 | if (q.has_return && (e->name == "$return")) |
1c0be8c7 | 4095 | code = q.dw.literal_stmt_for_return (scope_die, addr, e, lvalue, type); |
e19fda4e | 4096 | else |
1c0be8c7 JS |
4097 | code = q.dw.literal_stmt_for_local (getscopes(e), addr, e->sym_name(), |
4098 | e, lvalue, type); | |
70208613 | 4099 | |
1c0be8c7 JS |
4100 | functioncall* n = synthetic_embedded_deref_call(q.sess, fname, code, type, |
4101 | userspace_p, lvalue, e); | |
70208613 | 4102 | |
c69a87e0 FCE |
4103 | if (lvalue) |
4104 | { | |
4105 | // Provide the functioncall to our parent, so that it can be | |
4106 | // used to substitute for the assignment node immediately above | |
4107 | // us. | |
4108 | assert(!target_symbol_setter_functioncalls.empty()); | |
4109 | *(target_symbol_setter_functioncalls.top()) = n; | |
4110 | } | |
70208613 | 4111 | |
1c0be8c7 JS |
4112 | // Revisit the functioncall so arguments can be expanded. |
4113 | n->visit (this); | |
66d284f4 FCE |
4114 | } |
4115 | catch (const semantic_error& er) | |
4116 | { | |
9fab2262 JS |
4117 | // We suppress this error message, and pass the unresolved |
4118 | // target_symbol to the next pass. We hope that this value ends | |
4119 | // up not being referenced after all, so it can be optimized out | |
4120 | // quietly. | |
1af1e62d | 4121 | e->chain (er); |
9fab2262 | 4122 | provide (e); |
66d284f4 | 4123 | } |
77de5e9e GH |
4124 | } |
4125 | ||
4126 | ||
c24447be JS |
4127 | void |
4128 | dwarf_var_expanding_visitor::visit_cast_op (cast_op *e) | |
4129 | { | |
4130 | // Fill in our current module context if needed | |
4131 | if (e->module.empty()) | |
4132 | e->module = q.dw.module_name; | |
4133 | ||
4134 | var_expanding_visitor::visit_cast_op(e); | |
4135 | } | |
4136 | ||
4137 | ||
8cc799a5 JS |
4138 | void |
4139 | dwarf_var_expanding_visitor::visit_entry_op (entry_op *e) | |
4140 | { | |
4141 | expression *repl = e; | |
4142 | if (q.has_return) | |
4143 | { | |
4144 | // expand the operand as if it weren't a return probe | |
4145 | q.has_return = false; | |
4146 | replace (e->operand); | |
4147 | q.has_return = true; | |
4148 | ||
4149 | // XXX it would be nice to use gen_kretprobe_saved_return when available, | |
4150 | // but it requires knowing the types already, which is problematic for | |
4151 | // arbitrary expressons. | |
cc9001af | 4152 | repl = gen_mapped_saved_return (e->operand, "entry"); |
8cc799a5 JS |
4153 | } |
4154 | provide (repl); | |
4155 | } | |
4156 | ||
3689db05 SC |
4157 | void |
4158 | dwarf_var_expanding_visitor::visit_perf_op (perf_op *e) | |
4159 | { | |
ace7c23f | 4160 | string e_lit_val = e->operand->value; |
b78a0fbb | 4161 | |
3689db05 | 4162 | add_block = new block; |
9eaaceaa | 4163 | add_block->tok = e->tok; |
3689db05 SC |
4164 | |
4165 | systemtap_session &s = this->q.sess; | |
4166 | map<string, pair<string,derived_probe*> >::iterator it; | |
4167 | // Find the associated perf.counter probe | |
4168 | for (it=s.perf_counters.begin(); | |
4169 | it != s.perf_counters.end(); | |
4170 | it++) | |
4171 | if ((*it).first == e_lit_val) | |
4172 | { | |
4173 | // if perf .function("name") omitted, then set it to this process name | |
4174 | if ((*it).second.first.length() == 0) | |
4175 | ((*it).second).first = this->q.user_path; | |
4176 | if (((*it).second).first == this->q.user_path) | |
4177 | break; | |
4178 | } | |
4179 | ||
4180 | if (it != s.perf_counters.end()) | |
4181 | { | |
698de6cc | 4182 | perf_counter_refs.insert((*it).second.second); |
3689db05 SC |
4183 | // __perf_read_N is assigned in the probe prologue |
4184 | symbol* sym = new symbol; | |
4653caf1 | 4185 | sym->tok = e->tok; |
3689db05 SC |
4186 | sym->name = "__perf_read_" + (*it).first; |
4187 | provide (sym); | |
4188 | } | |
4189 | else | |
dc09353a | 4190 | throw SEMANTIC_ERROR(_F("perf counter '%s' not defined", e_lit_val.c_str())); |
3689db05 SC |
4191 | } |
4192 | ||
8cc799a5 | 4193 | |
729455a7 JS |
4194 | vector<Dwarf_Die>& |
4195 | dwarf_var_expanding_visitor::getscopes(target_symbol *e) | |
4196 | { | |
4197 | if (scopes.empty()) | |
4198 | { | |
04c8e51b | 4199 | if(!null_die(scope_die)) |
f25a9197 | 4200 | scopes = q.dw.getscopes(scope_die); |
729455a7 | 4201 | if (scopes.empty()) |
b530b5b3 LB |
4202 | //throw semantic_error (_F("unable to find any scopes containing %d", addr), e->tok); |
4203 | // ((scope_die == NULL) ? "" : (string (" in ") + (dwarf_diename(scope_die) ?: "<unknown>") + "(" + (dwarf_diename(q.dw.cu) ?: "<unknown>") ")" )) | |
dc09353a | 4204 | throw SEMANTIC_ERROR ("unable to find any scopes containing " |
729455a7 | 4205 | + lex_cast_hex(addr) |
04c8e51b | 4206 | + (null_die(scope_die) ? "" |
729455a7 JS |
4207 | : (string (" in ") |
4208 | + (dwarf_diename(scope_die) ?: "<unknown>") | |
4209 | + "(" + (dwarf_diename(q.dw.cu) ?: "<unknown>") | |
4210 | + ")")) | |
4211 | + " while searching for local '" | |
cc9001af | 4212 | + e->sym_name() + "'", |
729455a7 JS |
4213 | e->tok); |
4214 | } | |
4215 | return scopes; | |
4216 | } | |
4217 | ||
4218 | ||
5f36109e JS |
4219 | struct dwarf_cast_expanding_visitor: public var_expanding_visitor |
4220 | { | |
4221 | systemtap_session& s; | |
4222 | dwarf_builder& db; | |
4223 | ||
4224 | dwarf_cast_expanding_visitor(systemtap_session& s, dwarf_builder& db): | |
4225 | s(s), db(db) {} | |
4226 | void visit_cast_op (cast_op* e); | |
4227 | void filter_special_modules(string& module); | |
4228 | }; | |
4229 | ||
4230 | ||
c4ce66a1 JS |
4231 | struct dwarf_cast_query : public base_query |
4232 | { | |
946e1a48 | 4233 | cast_op& e; |
c4ce66a1 | 4234 | const bool lvalue; |
5f36109e JS |
4235 | const bool userspace_p; |
4236 | functioncall*& result; | |
c4ce66a1 | 4237 | |
5f36109e JS |
4238 | dwarf_cast_query(dwflpp& dw, const string& module, cast_op& e, bool lvalue, |
4239 | const bool userspace_p, functioncall*& result): | |
abb41d92 | 4240 | base_query(dw, module), e(e), lvalue(lvalue), |
5f36109e | 4241 | userspace_p(userspace_p), result(result) {} |
c4ce66a1 JS |
4242 | |
4243 | void handle_query_module(); | |
822a6a3d | 4244 | void query_library (const char *) {} |
576eaefe | 4245 | void query_plt (const char *entry, size_t addr) {} |
c4ce66a1 JS |
4246 | }; |
4247 | ||
4248 | ||
c4ce66a1 JS |
4249 | void |
4250 | dwarf_cast_query::handle_query_module() | |
4251 | { | |
5f36109e JS |
4252 | static unsigned tick = 0; |
4253 | ||
4254 | if (result) | |
c4ce66a1 JS |
4255 | return; |
4256 | ||
ea1e477a | 4257 | // look for the type in any CU |
a44a7cb5 JS |
4258 | Dwarf_Die* type_die = NULL; |
4259 | if (startswith(e.type_name, "class ")) | |
4260 | { | |
4261 | // normalize to match dwflpp::global_alias_caching_callback | |
4262 | string struct_name = "struct " + e.type_name.substr(6); | |
4263 | type_die = dw.declaration_resolve_other_cus(struct_name); | |
4264 | } | |
4265 | else | |
4266 | type_die = dw.declaration_resolve_other_cus(e.type_name); | |
4267 | ||
4268 | // NB: We now index the types as "struct name"/"union name"/etc. instead of | |
4269 | // just "name". But since we didn't require users to be explicit before, and | |
4270 | // actually sort of discouraged it, we must be flexible now. So if a lookup | |
4271 | // fails with a bare name, try augmenting it. | |
4272 | if (!type_die && | |
4273 | !startswith(e.type_name, "class ") && | |
4274 | !startswith(e.type_name, "struct ") && | |
4275 | !startswith(e.type_name, "union ") && | |
4276 | !startswith(e.type_name, "enum ")) | |
4277 | { | |
4278 | type_die = dw.declaration_resolve_other_cus("struct " + e.type_name); | |
4279 | if (!type_die) | |
4280 | type_die = dw.declaration_resolve_other_cus("union " + e.type_name); | |
4281 | if (!type_die) | |
4282 | type_die = dw.declaration_resolve_other_cus("enum " + e.type_name); | |
4283 | } | |
4284 | ||
ea1e477a JS |
4285 | if (!type_die) |
4286 | return; | |
c4ce66a1 | 4287 | |
5f36109e JS |
4288 | string code; |
4289 | exp_type type = pe_long; | |
4290 | ||
ea1e477a | 4291 | try |
c4ce66a1 | 4292 | { |
ea1e477a JS |
4293 | Dwarf_Die cu_mem; |
4294 | dw.focus_on_cu(dwarf_diecu(type_die, &cu_mem, NULL, NULL)); | |
5f36109e JS |
4295 | |
4296 | if (!e.components.empty() && | |
4297 | e.components.back().type == target_symbol::comp_pretty_print) | |
4298 | { | |
4299 | if (lvalue) | |
dc09353a | 4300 | throw SEMANTIC_ERROR(_("cannot write to pretty-printed variable"), e.tok); |
5f36109e | 4301 | |
d19a9a82 | 4302 | dwarf_pretty_print dpp(dw, type_die, e.operand, true, userspace_p, e); |
5f36109e JS |
4303 | result = dpp.expand(); |
4304 | return; | |
4305 | } | |
4306 | ||
4307 | code = dw.literal_stmt_for_pointer (type_die, &e, lvalue, type); | |
ea1e477a JS |
4308 | } |
4309 | catch (const semantic_error& er) | |
4310 | { | |
4311 | // NB: we can have multiple errors, since a @cast | |
1af1e62d JS |
4312 | // may be attempted using several different modules: |
4313 | // @cast(ptr, "type", "module1:module2:...") | |
4314 | e.chain (er); | |
c4ce66a1 | 4315 | } |
c4ce66a1 | 4316 | |
5f36109e JS |
4317 | if (code.empty()) |
4318 | return; | |
c4ce66a1 | 4319 | |
5f36109e | 4320 | string fname = (string(lvalue ? "_dwarf_cast_set" : "_dwarf_cast_get") |
cc9001af | 4321 | + "_" + e.sym_name() |
5f36109e | 4322 | + "_" + lex_cast(tick++)); |
c4ce66a1 | 4323 | |
1c0be8c7 JS |
4324 | result = synthetic_embedded_deref_call(dw.sess, fname, code, type, |
4325 | userspace_p, lvalue, &e, e.operand); | |
5f36109e | 4326 | } |
c4ce66a1 JS |
4327 | |
4328 | ||
fb0274bc JS |
4329 | void dwarf_cast_expanding_visitor::filter_special_modules(string& module) |
4330 | { | |
d90053e7 | 4331 | // look for "<path/to/header>" or "kernel<path/to/header>" |
fb0274bc | 4332 | // for those cases, build a module including that header |
d90053e7 | 4333 | if (module[module.size() - 1] == '>' && |
60d98537 | 4334 | (module[0] == '<' || startswith(module, "kernel<"))) |
fb0274bc JS |
4335 | { |
4336 | string cached_module; | |
4337 | if (s.use_cache) | |
4338 | { | |
4339 | // see if the cached module exists | |
a2639cb7 | 4340 | cached_module = find_typequery_hash(s, module); |
d105f664 | 4341 | if (!cached_module.empty() && !s.poison_cache) |
fb0274bc JS |
4342 | { |
4343 | int fd = open(cached_module.c_str(), O_RDONLY); | |
4344 | if (fd != -1) | |
4345 | { | |
4346 | if (s.verbose > 2) | |
b530b5b3 LB |
4347 | //TRANSLATORS: Here we're using a cached module. |
4348 | clog << _("Pass 2: using cached ") << cached_module << endl; | |
fb0274bc JS |
4349 | module = cached_module; |
4350 | close(fd); | |
4351 | return; | |
4352 | } | |
4353 | } | |
4354 | } | |
4355 | ||
4356 | // no cached module, time to make it | |
d90053e7 | 4357 | if (make_typequery(s, module) == 0) |
fb0274bc | 4358 | { |
e16dc041 | 4359 | // try to save typequery in the cache |
fb0274bc | 4360 | if (s.use_cache) |
e16dc041 | 4361 | copy_file(module, cached_module, s.verbose > 2); |
fb0274bc JS |
4362 | } |
4363 | } | |
4364 | } | |
4365 | ||
4366 | ||
c4ce66a1 JS |
4367 | void dwarf_cast_expanding_visitor::visit_cast_op (cast_op* e) |
4368 | { | |
4369 | bool lvalue = is_active_lvalue(e); | |
4370 | if (lvalue && !s.guru_mode) | |
dc09353a | 4371 | throw SEMANTIC_ERROR(_("write to @cast context variable not permitted; need stap -g"), e->tok); |
c4ce66a1 JS |
4372 | |
4373 | if (e->module.empty()) | |
4374 | e->module = "kernel"; // "*" may also be reasonable to search all kernel modules | |
4375 | ||
5f36109e | 4376 | functioncall* result = NULL; |
8b31197b JS |
4377 | |
4378 | // split the module string by ':' for alternatives | |
4379 | vector<string> modules; | |
4380 | tokenize(e->module, modules, ":"); | |
b5a0dd41 | 4381 | bool userspace_p=false; // PR10601 |
5f36109e | 4382 | for (unsigned i = 0; !result && i < modules.size(); ++i) |
c4ce66a1 | 4383 | { |
8b31197b | 4384 | string& module = modules[i]; |
fb0274bc | 4385 | filter_special_modules(module); |
abb41d92 | 4386 | |
c4ce66a1 JS |
4387 | // NB: This uses '/' to distinguish between kernel modules and userspace, |
4388 | // which means that userspace modules won't get any PATH searching. | |
4389 | dwflpp* dw; | |
707bf35e JS |
4390 | try |
4391 | { | |
b5a0dd41 FCE |
4392 | userspace_p=is_user_module (module); |
4393 | if (! userspace_p) | |
707bf35e JS |
4394 | { |
4395 | // kernel or kernel module target | |
ae2552da | 4396 | dw = db.get_kern_dw(s, module); |
707bf35e JS |
4397 | } |
4398 | else | |
4399 | { | |
05fb3e0c | 4400 | module = find_executable (module, "", s.sysenv); // canonicalize it |
707bf35e JS |
4401 | dw = db.get_user_dw(s, module); |
4402 | } | |
4403 | } | |
4404 | catch (const semantic_error& er) | |
4405 | { | |
4406 | /* ignore and go to the next module */ | |
4407 | continue; | |
4408 | } | |
c4ce66a1 | 4409 | |
5f36109e | 4410 | dwarf_cast_query q (*dw, module, *e, lvalue, userspace_p, result); |
06de3a04 | 4411 | dw->iterate_over_modules<base_query>(&query_module, &q); |
c4ce66a1 | 4412 | } |
abb41d92 | 4413 | |
5f36109e | 4414 | if (!result) |
c4ce66a1 | 4415 | { |
946e1a48 JS |
4416 | // We pass the unresolved cast_op to the next pass, and hope |
4417 | // that this value ends up not being referenced after all, so | |
4418 | // it can be optimized out quietly. | |
c4ce66a1 JS |
4419 | provide (e); |
4420 | return; | |
4421 | } | |
4422 | ||
c4ce66a1 JS |
4423 | if (lvalue) |
4424 | { | |
4425 | // Provide the functioncall to our parent, so that it can be | |
4426 | // used to substitute for the assignment node immediately above | |
4427 | // us. | |
4428 | assert(!target_symbol_setter_functioncalls.empty()); | |
5f36109e | 4429 | *(target_symbol_setter_functioncalls.top()) = result; |
c4ce66a1 JS |
4430 | } |
4431 | ||
5f36109e | 4432 | result->visit (this); |
77de5e9e GH |
4433 | } |
4434 | ||
4435 | ||
bd1fcbad YZ |
4436 | struct dwarf_atvar_expanding_visitor: public var_expanding_visitor |
4437 | { | |
4438 | systemtap_session& s; | |
4439 | dwarf_builder& db; | |
4440 | ||
4441 | dwarf_atvar_expanding_visitor(systemtap_session& s, dwarf_builder& db): | |
4442 | s(s), db(db) {} | |
4443 | void visit_atvar_op (atvar_op* e); | |
4444 | }; | |
4445 | ||
4446 | ||
4447 | struct dwarf_atvar_query: public base_query | |
4448 | { | |
4449 | atvar_op& e; | |
4450 | const bool userspace_p, lvalue; | |
4451 | functioncall*& result; | |
4452 | unsigned& tick; | |
4453 | const string cu_name_pattern; | |
4454 | ||
4455 | dwarf_atvar_query(dwflpp& dw, const string& module, atvar_op& e, | |
4456 | const bool userspace_p, const bool lvalue, | |
4457 | functioncall*& result, | |
4458 | unsigned& tick): | |
4459 | base_query(dw, module), e(e), | |
4460 | userspace_p(userspace_p), lvalue(lvalue), result(result), | |
4461 | tick(tick), cu_name_pattern(string("*/") + e.cu_name) {} | |
4462 | ||
4463 | void handle_query_module (); | |
4464 | void query_library (const char *) {} | |
4465 | void query_plt (const char *entry, size_t addr) {} | |
5c378838 | 4466 | static int atvar_query_cu (Dwarf_Die *cudie, dwarf_atvar_query *q); |
bd1fcbad YZ |
4467 | }; |
4468 | ||
4469 | ||
4470 | int | |
5c378838 | 4471 | dwarf_atvar_query::atvar_query_cu (Dwarf_Die * cudie, dwarf_atvar_query *q) |
bd1fcbad | 4472 | { |
bd1fcbad YZ |
4473 | if (! q->e.cu_name.empty()) |
4474 | { | |
c60517ca | 4475 | const char *die_name = dwarf_diename(cudie) ?: ""; |
bd1fcbad YZ |
4476 | if (strcmp(die_name, q->e.cu_name.c_str()) != 0 // Perfect match |
4477 | && fnmatch(q->cu_name_pattern.c_str(), die_name, 0) != 0) | |
4478 | { | |
4479 | return DWARF_CB_OK; | |
4480 | } | |
4481 | } | |
4482 | ||
4483 | try | |
4484 | { | |
4485 | vector<Dwarf_Die> scopes(1, *cudie); | |
4486 | ||
4487 | q->dw.focus_on_cu (cudie); | |
4488 | ||
4489 | if (! q->e.components.empty() && | |
4490 | q->e.components.back().type == target_symbol::comp_pretty_print) | |
4491 | { | |
4492 | dwarf_pretty_print dpp (q->dw, scopes, 0, q->e.sym_name(), | |
4493 | q->userspace_p, q->e); | |
4494 | q->result = dpp.expand(); | |
4495 | return DWARF_CB_ABORT; | |
4496 | } | |
4497 | ||
4498 | exp_type type = pe_long; | |
4499 | string code = q->dw.literal_stmt_for_local (scopes, 0, q->e.sym_name(), | |
4500 | &q->e, q->lvalue, type); | |
4501 | ||
4502 | if (code.empty()) | |
4503 | return DWARF_CB_OK; | |
4504 | ||
4505 | string fname = (string(q->lvalue ? "_dwarf_tvar_set" | |
4506 | : "_dwarf_tvar_get") | |
4507 | + "_" + q->e.sym_name() | |
4508 | + "_" + lex_cast(q->tick++)); | |
4509 | ||
4510 | q->result = synthetic_embedded_deref_call (q->sess, fname, code, type, | |
4511 | q->userspace_p, q->lvalue, | |
4512 | &q->e); | |
4513 | } | |
4514 | catch (const semantic_error& er) | |
4515 | { | |
4516 | // Here we suppress the error because we often just have too many | |
4517 | // when scanning all the CUs. | |
4518 | return DWARF_CB_OK; | |
4519 | } | |
4520 | ||
4521 | if (q->result) { | |
4522 | return DWARF_CB_ABORT; | |
4523 | } | |
4524 | ||
4525 | return DWARF_CB_OK; | |
4526 | } | |
4527 | ||
4528 | ||
4529 | void | |
4530 | dwarf_atvar_query::handle_query_module () | |
4531 | { | |
4532 | ||
4533 | dw.iterate_over_cus(atvar_query_cu, this, false); | |
4534 | } | |
4535 | ||
4536 | ||
4537 | void | |
4538 | dwarf_atvar_expanding_visitor::visit_atvar_op (atvar_op* e) | |
4539 | { | |
4540 | const bool lvalue = is_active_lvalue(e); | |
4541 | if (lvalue && !s.guru_mode) | |
dc09353a | 4542 | throw SEMANTIC_ERROR(_("write to @var variable not permitted; " |
bd1fcbad YZ |
4543 | "need stap -g"), e->tok); |
4544 | ||
4545 | if (e->module.empty()) | |
4546 | e->module = "kernel"; | |
4547 | ||
4548 | functioncall* result = NULL; | |
4549 | ||
4550 | // split the module string by ':' for alternatives | |
4551 | vector<string> modules; | |
4552 | tokenize(e->module, modules, ":"); | |
4553 | bool userspace_p = false; | |
4554 | for (unsigned i = 0; !result && i < modules.size(); ++i) | |
4555 | { | |
4556 | string& module = modules[i]; | |
4557 | ||
4558 | dwflpp* dw; | |
4559 | try | |
4560 | { | |
4561 | userspace_p = is_user_module(module); | |
4562 | if (!userspace_p) | |
4563 | { | |
4564 | // kernel or kernel module target | |
4565 | dw = db.get_kern_dw(s, module); | |
4566 | } | |
4567 | else | |
4568 | { | |
4569 | module = find_executable(module, "", s.sysenv); | |
4570 | dw = db.get_user_dw(s, module); | |
4571 | } | |
4572 | } | |
4573 | catch (const semantic_error& er) | |
4574 | { | |
4575 | /* ignore and go to the next module */ | |
4576 | continue; | |
4577 | } | |
4578 | ||
4579 | dwarf_atvar_query q (*dw, module, *e, userspace_p, lvalue, result, tick); | |
06de3a04 | 4580 | dw->iterate_over_modules<base_query>(&query_module, &q); |
bd1fcbad YZ |
4581 | |
4582 | if (result) | |
4583 | { | |
4584 | s.unwindsym_modules.insert(module); | |
bd1fcbad YZ |
4585 | |
4586 | if (lvalue) | |
4587 | { | |
4588 | // Provide the functioncall to our parent, so that it can be | |
4589 | // used to substitute for the assignment node immediately above | |
4590 | // us. | |
4591 | assert(!target_symbol_setter_functioncalls.empty()); | |
4592 | *(target_symbol_setter_functioncalls.top()) = result; | |
4593 | } | |
4594 | ||
4595 | result->visit(this); | |
4596 | return; | |
4597 | } | |
4598 | ||
4599 | /* Unable to find the variable in the current module, so we chain | |
4600 | * an error in atvar_op */ | |
dc09353a | 4601 | semantic_error er(ERR_SRC, _F("unable to find global '%s' in %s%s%s", |
bd1fcbad YZ |
4602 | e->sym_name().c_str(), module.c_str(), |
4603 | e->cu_name.empty() ? "" : _(", in "), | |
4604 | e->cu_name.c_str())); | |
4605 | e->chain (er); | |
4606 | } | |
4607 | ||
4608 | provide(e); | |
4609 | } | |
4610 | ||
4611 | ||
b8da0ad1 FCE |
4612 | void |
4613 | dwarf_derived_probe::printsig (ostream& o) const | |
4614 | { | |
4615 | // Instead of just printing the plain locations, we add a PC value | |
4616 | // as a comment as a way of telling e.g. apart multiple inlined | |
4617 | // function instances. This is distinct from the verbose/clog | |
4618 | // output, since this part goes into the cache hash calculations. | |
4619 | sole_location()->print (o); | |
6d0f3f0c | 4620 | o << " /* pc=" << section << "+0x" << hex << addr << dec << " */"; |
b8da0ad1 FCE |
4621 | printsig_nested (o); |
4622 | } | |
4623 | ||
4624 | ||
4625 | ||
dc38c0ae | 4626 | void |
b20febf3 FCE |
4627 | dwarf_derived_probe::join_group (systemtap_session& s) |
4628 | { | |
af234c40 JS |
4629 | // skip probes which are paired entry-handlers |
4630 | if (!has_return && (saved_longs || saved_strings)) | |
4631 | return; | |
4632 | ||
b20febf3 FCE |
4633 | if (! s.dwarf_derived_probes) |
4634 | s.dwarf_derived_probes = new dwarf_derived_probe_group (); | |
4635 | s.dwarf_derived_probes->enroll (this); | |
4636 | } | |
4637 | ||
4638 | ||
2b69faaf JS |
4639 | static bool |
4640 | kernel_supports_inode_uprobes(systemtap_session& s) | |
4641 | { | |
4642 | // The arch-supports is new to the builtin inode-uprobes, so it makes a | |
4643 | // reasonable indicator of the new API. Else we'll need an autoconf... | |
64e807c2 | 4644 | // see also buildrun.cxx:kernel_built_uprobs() |
2b69faaf JS |
4645 | return (s.kernel_config["CONFIG_ARCH_SUPPORTS_UPROBES"] == "y" |
4646 | && s.kernel_config["CONFIG_UPROBES"] == "y"); | |
4647 | } | |
4648 | ||
4649 | ||
3667d615 JS |
4650 | static bool |
4651 | kernel_supports_inode_uretprobes(systemtap_session& s) | |
4652 | { | |
766013af JS |
4653 | // We need inode-uprobes first, then look for a sign of uretprobes. The only |
4654 | // non-static function at present is arch_uretprobe_hijack_return_addr. | |
3667d615 | 4655 | return kernel_supports_inode_uprobes(s) && |
af9e147f | 4656 | (s.kernel_functions.count("arch_uretprobe_hijack_return_addr") > 0); |
3667d615 JS |
4657 | } |
4658 | ||
4659 | ||
5261f7ab DS |
4660 | void |
4661 | check_process_probe_kernel_support(systemtap_session& s) | |
4662 | { | |
4663 | // If we've got utrace, we're good to go. | |
4664 | if (s.kernel_config["CONFIG_UTRACE"] == "y") | |
4665 | return; | |
4666 | ||
8c021542 DS |
4667 | // We don't have utrace. For process probes that aren't |
4668 | // uprobes-based, we just need the task_finder. The task_finder | |
b266d318 DS |
4669 | // needs CONFIG_TRACEPOINTS and specific tracepoints. There is a |
4670 | // specific autoconf test for its needs. | |
8c021542 DS |
4671 | // |
4672 | // We'll just require CONFIG_TRACEPOINTS here as a quick-and-dirty | |
4673 | // approximation. | |
4674 | if (! s.need_uprobes && s.kernel_config["CONFIG_TRACEPOINTS"] == "y") | |
4675 | return; | |
4676 | ||
d3e959b0 DS |
4677 | // For uprobes-based process probes, we need the task_finder plus |
4678 | // the builtin inode-uprobes. | |
8c021542 DS |
4679 | if (s.need_uprobes |
4680 | && s.kernel_config["CONFIG_TRACEPOINTS"] == "y" | |
d3e959b0 | 4681 | && kernel_supports_inode_uprobes(s)) |
8c021542 DS |
4682 | return; |
4683 | ||
dc09353a | 4684 | throw SEMANTIC_ERROR (_("process probes not available without kernel CONFIG_UTRACE or CONFIG_TRACEPOINTS/CONFIG_ARCH_SUPPORTS_UPROBES/CONFIG_UPROBES")); |
5261f7ab DS |
4685 | } |
4686 | ||
4687 | ||
b20febf3 FCE |
4688 | dwarf_derived_probe::dwarf_derived_probe(const string& funcname, |
4689 | const string& filename, | |
4690 | int line, | |
91af0778 | 4691 | // module & section specify a relocation |
b20febf3 FCE |
4692 | // base for <addr>, unless section=="" |
4693 | // (equivalently module=="kernel") | |
4694 | const string& module, | |
4695 | const string& section, | |
4696 | // NB: dwfl_addr is the virtualized | |
4697 | // address for this symbol. | |
4698 | Dwarf_Addr dwfl_addr, | |
4699 | // addr is the section-offset for | |
4700 | // actual relocation. | |
4701 | Dwarf_Addr addr, | |
4702 | dwarf_query& q, | |
37ebca01 | 4703 | Dwarf_Die* scope_die /* may be null */) |
4c5d1300 | 4704 | : derived_probe (q.base_probe, q.base_loc, true /* .components soon rewritten */ ), |
b20febf3 | 4705 | module (module), section (section), addr (addr), |
63b4fd14 | 4706 | path (q.path), |
27dc09b1 | 4707 | has_process (q.has_process), |
c9bad430 DS |
4708 | has_return (q.has_return), |
4709 | has_maxactive (q.has_maxactive), | |
c57ea854 | 4710 | has_library (q.has_library), |
6b66b9f7 | 4711 | maxactive_val (q.maxactive_val), |
b642c901 SC |
4712 | user_path (q.user_path), |
4713 | user_lib (q.user_lib), | |
af234c40 | 4714 | access_vars(false), |
c57ea854 | 4715 | saved_longs(0), saved_strings(0), |
af234c40 | 4716 | entry_handler(0) |
bd2b1e68 | 4717 | { |
b642c901 SC |
4718 | if (user_lib.size() != 0) |
4719 | has_library = true; | |
4720 | ||
6b66b9f7 JS |
4721 | if (q.has_process) |
4722 | { | |
4723 | // We may receive probes on two types of ELF objects: ET_EXEC or ET_DYN. | |
4724 | // ET_EXEC ones need no further relocation on the addr(==dwfl_addr), whereas | |
4725 | // ET_DYN ones do (addr += run-time mmap base address). We tell these apart | |
4726 | // by the incoming section value (".absolute" vs. ".dynamic"). | |
4727 | // XXX Assert invariants here too? | |
2b69faaf JS |
4728 | |
4729 | // inode-uprobes needs an offset rather than an absolute VM address. | |
4441e344 | 4730 | // ditto for userspace runtimes (dyninst) |
ac3af990 | 4731 | if ((kernel_supports_inode_uprobes(q.dw.sess) || q.dw.sess.runtime_usermode_p()) && |
2b69faaf JS |
4732 | section == ".absolute" && addr == dwfl_addr && |
4733 | addr >= q.dw.module_start && addr < q.dw.module_end) | |
4734 | this->addr = addr - q.dw.module_start; | |
6b66b9f7 JS |
4735 | } |
4736 | else | |
4737 | { | |
4738 | // Assert kernel relocation invariants | |
4739 | if (section == "" && dwfl_addr != addr) // addr should be absolute | |
dc09353a | 4740 | throw SEMANTIC_ERROR (_("missing relocation basis"), tok); |
6b66b9f7 | 4741 | if (section != "" && dwfl_addr == addr) // addr should be an offset |
dc09353a | 4742 | throw SEMANTIC_ERROR (_("inconsistent relocation address"), tok); |
6b66b9f7 | 4743 | } |
2930abc7 | 4744 | |
21beacc9 FCE |
4745 | // XXX: hack for strange g++/gcc's |
4746 | #ifndef USHRT_MAX | |
4747 | #define USHRT_MAX 32767 | |
4748 | #endif | |
4749 | ||
606fd9c8 | 4750 | // Range limit maxactive() value |
6b66b9f7 | 4751 | if (has_maxactive && (maxactive_val < 0 || maxactive_val > USHRT_MAX)) |
dc09353a | 4752 | throw SEMANTIC_ERROR (_F("maxactive value out of range [0,%s]", |
b530b5b3 | 4753 | lex_cast(USHRT_MAX).c_str()), q.base_loc->components.front()->tok); |
606fd9c8 | 4754 | |
a7696882 JL |
4755 | // Expand target variables in the probe body. Even if the scope_die is |
4756 | // invalid, we still want to expand things such as $$vars/$$parms/etc... | |
4757 | // (PR15999, PR16473). Access to specific context vars e.g. $argc will not be | |
4758 | // expanded and will produce an error during the typeresolution_info pass. | |
8fc05e57 | 4759 | { |
6b66b9f7 | 4760 | // XXX: user-space deref's for q.has_process! |
5a617dc6 JL |
4761 | |
4762 | // PR14436: if we're expanding target variables in the probe body of a | |
4763 | // .return probe, we need to make the expansion at the postprologue addr | |
4764 | // instead (if any), which is then also the spot where the entry handler | |
4765 | // probe is placed. (Note that at this point, a nonzero prologue_end | |
4766 | // implies that it should be used, i.e. code is unoptimized). | |
4767 | Dwarf_Addr handler_dwfl_addr = dwfl_addr; | |
4768 | if (q.prologue_end != 0 && q.has_return) | |
4769 | { | |
4770 | handler_dwfl_addr = q.prologue_end; | |
4771 | if (q.sess.verbose > 2) | |
4772 | clog << _F("expanding .return vars at prologue_end (0x%s) " | |
4773 | "rather than entrypc (0x%s)\n", | |
4774 | lex_cast_hex(handler_dwfl_addr).c_str(), | |
4775 | lex_cast_hex(dwfl_addr).c_str()); | |
4776 | } | |
4777 | dwarf_var_expanding_visitor v (q, scope_die, handler_dwfl_addr); | |
8b095b45 | 4778 | v.replace (this->body); |
3689db05 SC |
4779 | |
4780 | // Propagate perf.counters so we can emit later | |
4781 | this->perf_counter_refs = v.perf_counter_refs; | |
4782 | // Emit local var used to save the perf counter read value | |
698de6cc | 4783 | std::set<derived_probe*>::iterator pcii; |
3689db05 SC |
4784 | for (pcii = v.perf_counter_refs.begin(); |
4785 | pcii != v.perf_counter_refs.end(); pcii++) | |
4786 | { | |
4787 | map<string, pair<string,derived_probe*> >::iterator it; | |
4788 | // Find the associated perf counter probe | |
4789 | for (it=q.sess.perf_counters.begin() ; | |
4790 | it != q.sess.perf_counters.end(); | |
4791 | it++) | |
4792 | if ((*it).second.second == (*pcii)) | |
4793 | break; | |
4794 | vardecl* vd = new vardecl; | |
4795 | vd->name = "__perf_read_" + (*it).first; | |
4796 | vd->tok = this->tok; | |
4797 | vd->set_arity(0, this->tok); | |
4798 | vd->type = pe_long; | |
4799 | vd->synthetic = true; | |
4800 | this->locals.push_back (vd); | |
4801 | } | |
4802 | ||
4803 | ||
6b66b9f7 JS |
4804 | if (!q.has_process) |
4805 | access_vars = v.visited; | |
37ebca01 FCE |
4806 | |
4807 | // If during target-variable-expanding the probe, we added a new block | |
4808 | // of code, add it to the start of the probe. | |
4809 | if (v.add_block) | |
ba6f838d | 4810 | this->body = new block(v.add_block, this->body); |
2260f4e3 FCE |
4811 | |
4812 | // If when target-variable-expanding the probe, we need to synthesize a | |
4813 | // sibling function-entry probe. We don't go through the whole probe derivation | |
4814 | // business (PR10642) that could lead to wildcard/alias resolution, or for that | |
4815 | // dwarf-induced duplication. | |
4816 | if (v.add_call_probe) | |
37ebca01 | 4817 | { |
2260f4e3 FCE |
4818 | assert (q.has_return && !q.has_call); |
4819 | ||
4820 | // We temporarily replace q.base_probe. | |
4821 | statement* old_body = q.base_probe->body; | |
4822 | q.base_probe->body = v.add_call_probe; | |
4823 | q.has_return = false; | |
4824 | q.has_call = true; | |
af234c40 | 4825 | |
da23eceb | 4826 | if (q.has_process) |
5a617dc6 JL |
4827 | { |
4828 | // Place handler probe at the same addr as where the vars were | |
4829 | // expanded (which may not be the same addr as the one for the | |
4830 | // main retprobe, PR14436). | |
4831 | Dwarf_Addr handler_addr = addr; | |
4832 | if (handler_dwfl_addr != dwfl_addr) | |
4833 | // adjust section offset by prologue_end-entrypc | |
4834 | handler_addr += handler_dwfl_addr - dwfl_addr; | |
4835 | entry_handler = new uprobe_derived_probe (funcname, filename, | |
4836 | line, module, section, | |
4837 | handler_dwfl_addr, | |
4838 | handler_addr, q, | |
4839 | scope_die); | |
4840 | } | |
da23eceb | 4841 | else |
af234c40 JS |
4842 | entry_handler = new dwarf_derived_probe (funcname, filename, line, |
4843 | module, section, dwfl_addr, | |
4844 | addr, q, scope_die); | |
4845 | ||
4846 | saved_longs = entry_handler->saved_longs = v.saved_longs; | |
4847 | saved_strings = entry_handler->saved_strings = v.saved_strings; | |
4848 | ||
4849 | q.results.push_back (entry_handler); | |
2260f4e3 FCE |
4850 | |
4851 | q.has_return = true; | |
4852 | q.has_call = false; | |
4853 | q.base_probe->body = old_body; | |
37ebca01 | 4854 | } |
a7696882 JL |
4855 | // Save the local variables for listing mode. If the scope_die is null, |
4856 | // local vars aren't accessible, so no need to invoke saveargs (PR10820). | |
bba368c5 JL |
4857 | if (!null_die(scope_die) && |
4858 | q.sess.dump_mode == systemtap_session::dump_matched_probes_vars) | |
4859 | saveargs(q, scope_die, dwfl_addr); | |
8fc05e57 | 4860 | } |
0a98fd42 | 4861 | |
5d23847d | 4862 | // Reset the sole element of the "locations" vector as a |
b20febf3 FCE |
4863 | // "reverse-engineered" form of the incoming (q.base_loc) probe |
4864 | // point. This allows a user to see what function / file / line | |
4865 | // number any particular match of the wildcards. | |
919debfc JL |
4866 | |
4867 | vector<probe_point::component*> comps; | |
4868 | if (q.has_kernel) | |
4869 | comps.push_back (new probe_point::component(TOK_KERNEL)); | |
4870 | else if(q.has_module) | |
4871 | comps.push_back (new probe_point::component(TOK_MODULE, new literal_string(module))); | |
4872 | else if(q.has_process) | |
4873 | comps.push_back (new probe_point::component(TOK_PROCESS, new literal_string(module))); | |
4874 | else | |
4875 | assert (0); | |
4876 | ||
4877 | string fn_or_stmt; | |
4878 | if (q.has_function_str || q.has_function_num) | |
e772a6e7 | 4879 | fn_or_stmt = TOK_FUNCTION; |
919debfc | 4880 | else |
e772a6e7 | 4881 | fn_or_stmt = TOK_STATEMENT; |
919debfc JL |
4882 | |
4883 | if (q.has_function_str || q.has_statement_str) | |
4884 | { | |
79954c0f | 4885 | string retro_name = q.final_function_name(funcname, filename.c_str(), line); |
919debfc JL |
4886 | comps.push_back |
4887 | (new probe_point::component | |
4888 | (fn_or_stmt, new literal_string (retro_name))); | |
4889 | } | |
4890 | else if (q.has_function_num || q.has_statement_num) | |
4891 | { | |
4892 | Dwarf_Addr retro_addr; | |
4893 | if (q.has_function_num) | |
4894 | retro_addr = q.function_num_val; | |
4895 | else | |
4896 | retro_addr = q.statement_num_val; | |
4897 | comps.push_back (new probe_point::component | |
4898 | (fn_or_stmt, | |
4899 | new literal_number(retro_addr, true))); | |
4900 | ||
4901 | if (q.has_absolute) | |
4902 | comps.push_back (new probe_point::component (TOK_ABSOLUTE)); | |
4903 | } | |
4904 | ||
4905 | if (q.has_call) | |
4906 | comps.push_back (new probe_point::component(TOK_CALL)); | |
4907 | if (q.has_exported) | |
4908 | comps.push_back (new probe_point::component(TOK_EXPORTED)); | |
4909 | if (q.has_inline) | |
4910 | comps.push_back (new probe_point::component(TOK_INLINE)); | |
4911 | if (has_return) | |
4912 | comps.push_back (new probe_point::component(TOK_RETURN)); | |
4913 | if (has_maxactive) | |
4914 | comps.push_back (new probe_point::component | |
4915 | (TOK_MAXACTIVE, new literal_number(maxactive_val))); | |
4916 | ||
4917 | // Overwrite it. | |
4918 | this->sole_location()->components = comps; | |
e2941743 JL |
4919 | |
4920 | // if it's a .callee[s[(N)]] call, add checks to the probe body so that the | |
4921 | // user body is only 'triggered' when called from q.callers[N-1], which | |
4922 | // itself is called from q.callers[N-2], etc... I.E. | |
4923 | // callees(N) --> N elements in q.callers --> N checks against [u]stack(0..N-1) | |
4924 | if ((q.has_callee || q.has_callees_num) && q.callers && !q.callers->empty()) | |
4925 | { | |
4926 | if (q.sess.verbose > 2) | |
7761da8b | 4927 | clog << _F("adding caller checks for callee %s\n", funcname.c_str()); |
e2941743 JL |
4928 | |
4929 | // Copy the stack and empty it out | |
4930 | stack<Dwarf_Addr> callers(*q.callers); | |
4931 | for (unsigned level = 1; !callers.empty(); level++, | |
4932 | callers.pop()) | |
4933 | { | |
4934 | Dwarf_Addr caller = callers.top(); | |
4935 | ||
4936 | // We first need to make the caller addr relocatable | |
4937 | string caller_section; | |
4938 | Dwarf_Addr caller_reloc; | |
4939 | if (module == TOK_KERNEL) | |
4940 | { // allow for relocatable kernel (see also add_probe_point()) | |
4941 | caller_reloc = caller - q.sess.sym_stext; | |
4942 | caller_section = "_stext"; | |
4943 | } | |
4944 | else | |
4945 | caller_reloc = q.dw.relocate_address(caller, | |
4946 | caller_section); | |
4947 | ||
4948 | if (q.sess.verbose > 2) | |
7761da8b JL |
4949 | clog << _F("adding caller check [u]stack(%d) == reloc(0x%s)\n", |
4950 | level, lex_cast_hex(caller_reloc).c_str()); | |
e2941743 JL |
4951 | |
4952 | // We want to add a statement like this: | |
6211aed9 | 4953 | // if (!_caller_match(user, mod, sec, addr)) next; |
e2941743 JL |
4954 | // Something similar is done in semantic_pass_conditions() |
4955 | ||
4956 | functioncall* check = new functioncall(); | |
4957 | check->tok = this->tok; | |
6211aed9 | 4958 | check->function = "_caller_match"; |
e2941743 JL |
4959 | check->args.push_back(new literal_number(q.has_process)); |
4960 | check->args[0]->tok = this->tok; | |
4961 | check->args.push_back(new literal_number(level)); | |
4962 | check->args[1]->tok = this->tok; | |
4963 | check->args.push_back(new literal_string(module)); | |
4964 | check->args[2]->tok = this->tok; | |
4965 | check->args.push_back(new literal_string(caller_section)); | |
4966 | check->args[3]->tok = this->tok; | |
4967 | check->args.push_back(new literal_number(caller_reloc, true /* hex */)); | |
4968 | check->args[4]->tok = this->tok; | |
4969 | ||
4970 | unary_expression* notexp = new unary_expression(); | |
4971 | notexp->tok = this->tok; | |
4972 | notexp->op = "!"; | |
4973 | notexp->operand = check; | |
4974 | ||
4975 | if_statement* ifs = new if_statement(); | |
4976 | ifs->tok = this->tok; | |
4977 | ifs->thenblock = new next_statement(); | |
4978 | ifs->thenblock->tok = this->tok; | |
4979 | ifs->elseblock = NULL; | |
4980 | ifs->condition = notexp; | |
4981 | ||
4982 | this->body = new block(ifs, this->body); | |
4983 | } | |
4984 | } | |
2930abc7 FCE |
4985 | } |
4986 | ||
bd2b1e68 | 4987 | |
0a98fd42 | 4988 | void |
8c67c337 JS |
4989 | dwarf_derived_probe::saveargs(dwarf_query& q, Dwarf_Die* scope_die, |
4990 | Dwarf_Addr dwfl_addr) | |
0a98fd42 | 4991 | { |
9aa8ffce | 4992 | if (null_die(scope_die)) |
0a98fd42 | 4993 | return; |
0a98fd42 | 4994 | |
8c67c337 | 4995 | bool verbose = q.sess.verbose > 2; |
0a98fd42 | 4996 | |
8c67c337 | 4997 | if (verbose) |
b530b5b3 | 4998 | clog << _F("saveargs: examining '%s' (dieoffset: %#" PRIx64 ")\n", (dwarf_diename(scope_die)?: "unknown"), dwarf_dieoffset(scope_die)); |
0a98fd42 | 4999 | |
8c67c337 JS |
5000 | if (has_return) |
5001 | { | |
5002 | /* Only save the return value if it has a type. */ | |
5003 | string type_name; | |
5004 | Dwarf_Die type_die; | |
5005 | if (dwarf_attr_die (scope_die, DW_AT_type, &type_die) && | |
5006 | dwarf_type_name(&type_die, type_name)) | |
5007 | args.push_back("$return:"+type_name); | |
5008 | ||
5009 | else if (verbose) | |
b530b5b3 LB |
5010 | clog << _F("saveargs: failed to retrieve type name for return value (dieoffset: %s)\n", |
5011 | lex_cast_hex(dwarf_dieoffset(scope_die)).c_str()); | |
8c67c337 | 5012 | } |
d87623a1 | 5013 | |
0a98fd42 | 5014 | Dwarf_Die arg; |
4ef35696 JS |
5015 | vector<Dwarf_Die> scopes = q.dw.getscopes(scope_die); |
5016 | for (unsigned i = 0; i < scopes.size(); ++i) | |
5017 | { | |
5018 | if (dwarf_tag(&scopes[i]) == DW_TAG_compile_unit) | |
5019 | break; // we don't want file-level variables | |
5020 | if (dwarf_child (&scopes[i], &arg) == 0) | |
5021 | do | |
0a98fd42 | 5022 | { |
4ef35696 JS |
5023 | switch (dwarf_tag (&arg)) |
5024 | { | |
5025 | case DW_TAG_variable: | |
5026 | case DW_TAG_formal_parameter: | |
5027 | break; | |
0a98fd42 | 5028 | |
4ef35696 JS |
5029 | default: |
5030 | continue; | |
5031 | } | |
0a98fd42 | 5032 | |
4ef35696 JS |
5033 | /* Ignore this local if it has no name. */ |
5034 | const char *arg_name = dwarf_diename (&arg); | |
5035 | if (!arg_name) | |
8c67c337 JS |
5036 | { |
5037 | if (verbose) | |
b530b5b3 LB |
5038 | clog << _F("saveargs: failed to retrieve name for local (dieoffset: %s)\n", |
5039 | lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
8c67c337 JS |
5040 | continue; |
5041 | } | |
4ef35696 JS |
5042 | |
5043 | if (verbose) | |
b530b5b3 LB |
5044 | clog << _F("saveargs: finding location for local '%s' (dieoffset: %s)\n", |
5045 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
4ef35696 JS |
5046 | |
5047 | /* Ignore this local if it has no location (or not at this PC). */ | |
5048 | /* NB: It still may not be directly accessible, e.g. if it is an | |
5049 | * aggregate type, implicit_pointer, etc., but the user can later | |
5050 | * figure out how to access the interesting parts. */ | |
45b02a36 FCE |
5051 | |
5052 | /* XXX: Perhaps saveargs() / listings-mode should work by synthesizing | |
5053 | * several synthetic | |
5054 | * probe foo { $var } | |
5055 | * probes, testing them for overall resolvability. | |
5056 | */ | |
5057 | ||
4ef35696 JS |
5058 | Dwarf_Attribute attr_mem; |
5059 | if (!dwarf_attr_integrate (&arg, DW_AT_const_value, &attr_mem)) | |
5060 | { | |
5061 | Dwarf_Op *expr; | |
5062 | size_t len; | |
5063 | if (!dwarf_attr_integrate (&arg, DW_AT_location, &attr_mem)) | |
5064 | { | |
5065 | if (verbose) | |
b530b5b3 LB |
5066 | clog << _F("saveargs: failed to resolve the location for local '%s' (dieoffset: %s)\n", |
5067 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
4ef35696 JS |
5068 | continue; |
5069 | } | |
5070 | else if (!(dwarf_getlocation_addr(&attr_mem, dwfl_addr, &expr, | |
5071 | &len, 1) == 1 && len > 0)) | |
5072 | { | |
45b02a36 FCE |
5073 | Dwarf_Addr dwfl_addr2 = q.dw.pr15123_retry_addr (dwfl_addr, & arg); |
5074 | if (!dwfl_addr2 || (!(dwarf_getlocation_addr(&attr_mem, dwfl_addr2, &expr, | |
5075 | &len, 1) == 1 && len > 0))) { | |
5076 | if (verbose) | |
5077 | clog << _F("saveargs: local '%s' (dieoffset: %s) is not available at this address (%s)\n", | |
5078 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str(), lex_cast_hex(dwfl_addr).c_str()); | |
5079 | continue; | |
5080 | } | |
4ef35696 JS |
5081 | } |
5082 | } | |
5083 | ||
5084 | /* Ignore this local if it has no type. */ | |
5085 | string type_name; | |
5086 | Dwarf_Die type_die; | |
5087 | if (!dwarf_attr_die (&arg, DW_AT_type, &type_die) || | |
5088 | !dwarf_type_name(&type_die, type_name)) | |
8c67c337 JS |
5089 | { |
5090 | if (verbose) | |
b530b5b3 LB |
5091 | clog << _F("saveargs: failed to retrieve type name for local '%s' (dieoffset: %s)\n", |
5092 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
8c67c337 JS |
5093 | continue; |
5094 | } | |
8c67c337 | 5095 | |
4ef35696 JS |
5096 | /* This local looks good -- save it! */ |
5097 | args.push_back("$"+string(arg_name)+":"+type_name); | |
8c67c337 | 5098 | } |
4ef35696 JS |
5099 | while (dwarf_siblingof (&arg, &arg) == 0); |
5100 | } | |
0a98fd42 JS |
5101 | } |
5102 | ||
5103 | ||
5104 | void | |
d0bfd2ac | 5105 | dwarf_derived_probe::getargs(std::list<std::string> &arg_set) const |
0a98fd42 | 5106 | { |
d0bfd2ac | 5107 | arg_set.insert(arg_set.end(), args.begin(), args.end()); |
0a98fd42 JS |
5108 | } |
5109 | ||
5110 | ||
27dc09b1 | 5111 | void |
42e38653 | 5112 | dwarf_derived_probe::emit_privilege_assertion (translator_output* o) |
27dc09b1 DB |
5113 | { |
5114 | if (has_process) | |
5115 | { | |
5116 | // These probes are allowed for unprivileged users, but only in the | |
5117 | // context of processes which they own. | |
5118 | emit_process_owner_assertion (o); | |
5119 | return; | |
5120 | } | |
5121 | ||
5122 | // Other probes must contain the default assertion which aborts | |
5123 | // if executed by an unprivileged user. | |
42e38653 | 5124 | derived_probe::emit_privilege_assertion (o); |
27dc09b1 DB |
5125 | } |
5126 | ||
5127 | ||
5128 | void | |
5129 | dwarf_derived_probe::print_dupe_stamp(ostream& o) | |
5130 | { | |
5131 | if (has_process) | |
5132 | { | |
5133 | // These probes are allowed for unprivileged users, but only in the | |
5134 | // context of processes which they own. | |
5135 | print_dupe_stamp_unprivileged_process_owner (o); | |
5136 | return; | |
5137 | } | |
5138 | ||
5139 | // Other probes must contain the default dupe stamp | |
5140 | derived_probe::print_dupe_stamp (o); | |
5141 | } | |
5142 | ||
64211010 | 5143 | |
7a053d3b | 5144 | void |
20c6c071 | 5145 | dwarf_derived_probe::register_statement_variants(match_node * root, |
27dc09b1 | 5146 | dwarf_builder * dw, |
42e38653 | 5147 | privilege_t privilege) |
bd2b1e68 | 5148 | { |
27dc09b1 | 5149 | root |
42e38653 | 5150 | ->bind_privilege(privilege) |
27dc09b1 | 5151 | ->bind(dw); |
54efe513 GH |
5152 | } |
5153 | ||
7a053d3b | 5154 | void |
fd6602a0 | 5155 | dwarf_derived_probe::register_function_variants(match_node * root, |
27dc09b1 | 5156 | dwarf_builder * dw, |
42e38653 | 5157 | privilege_t privilege) |
2865d17a | 5158 | { |
27dc09b1 | 5159 | root |
42e38653 | 5160 | ->bind_privilege(privilege) |
27dc09b1 | 5161 | ->bind(dw); |
27dc09b1 | 5162 | root->bind(TOK_CALL) |
42e38653 | 5163 | ->bind_privilege(privilege) |
27dc09b1 | 5164 | ->bind(dw); |
4bda987e SC |
5165 | root->bind(TOK_EXPORTED) |
5166 | ->bind_privilege(privilege) | |
5167 | ->bind(dw); | |
27dc09b1 | 5168 | root->bind(TOK_RETURN) |
42e38653 | 5169 | ->bind_privilege(privilege) |
27dc09b1 | 5170 | ->bind(dw); |
1e035395 | 5171 | |
f6be7c06 DB |
5172 | // For process probes / uprobes, .maxactive() is unused. |
5173 | if (! pr_contains (privilege, pr_stapusr)) | |
1e035395 FCE |
5174 | { |
5175 | root->bind(TOK_RETURN) | |
1e035395 FCE |
5176 | ->bind_num(TOK_MAXACTIVE)->bind(dw); |
5177 | } | |
bd2b1e68 GH |
5178 | } |
5179 | ||
7a053d3b | 5180 | void |
27dc09b1 | 5181 | dwarf_derived_probe::register_function_and_statement_variants( |
440d9b00 | 5182 | systemtap_session& s, |
27dc09b1 DB |
5183 | match_node * root, |
5184 | dwarf_builder * dw, | |
42e38653 | 5185 | privilege_t privilege |
27dc09b1 | 5186 | ) |
bd2b1e68 GH |
5187 | { |
5188 | // Here we match 4 forms: | |
5189 | // | |
5190 | // .function("foo") | |
5191 | // .function(0xdeadbeef) | |
5192 | // .statement("foo") | |
5193 | // .statement(0xdeadbeef) | |
5194 | ||
440d9b00 | 5195 | match_node *fv_root = root->bind_str(TOK_FUNCTION); |
42e38653 | 5196 | register_function_variants(fv_root, dw, privilege); |
7f02ca94 | 5197 | // ROOT.function("STRING") always gets the .inline and .label variants. |
440d9b00 | 5198 | fv_root->bind(TOK_INLINE) |
42e38653 | 5199 | ->bind_privilege(privilege) |
440d9b00 | 5200 | ->bind(dw); |
7f02ca94 JS |
5201 | fv_root->bind_str(TOK_LABEL) |
5202 | ->bind_privilege(privilege) | |
440d9b00 | 5203 | ->bind(dw); |
c31add50 JL |
5204 | fv_root->bind_str(TOK_CALLEE) |
5205 | ->bind_privilege(privilege) | |
5206 | ->bind(dw); | |
5207 | fv_root->bind(TOK_CALLEES) | |
5208 | ->bind_privilege(privilege) | |
5209 | ->bind(dw); | |
5210 | fv_root->bind_num(TOK_CALLEES) | |
5211 | ->bind_privilege(privilege) | |
5212 | ->bind(dw); | |
440d9b00 DB |
5213 | |
5214 | fv_root = root->bind_num(TOK_FUNCTION); | |
42e38653 | 5215 | register_function_variants(fv_root, dw, privilege); |
440d9b00 DB |
5216 | // ROOT.function(NUMBER).inline is deprecated in release 1.7 and removed thereafter. |
5217 | if (strverscmp(s.compatible.c_str(), "1.7") <= 0) | |
5218 | { | |
5219 | fv_root->bind(TOK_INLINE) | |
42e38653 | 5220 | ->bind_privilege(privilege) |
440d9b00 DB |
5221 | ->bind(dw); |
5222 | } | |
5223 | ||
42e38653 DB |
5224 | register_statement_variants(root->bind_str(TOK_STATEMENT), dw, privilege); |
5225 | register_statement_variants(root->bind_num(TOK_STATEMENT), dw, privilege); | |
bd2b1e68 GH |
5226 | } |
5227 | ||
b1615c74 JS |
5228 | void |
5229 | dwarf_derived_probe::register_sdt_variants(systemtap_session& s, | |
5230 | match_node * root, | |
5231 | dwarf_builder * dw) | |
5232 | { | |
5233 | root->bind_str(TOK_MARK) | |
f66bb29a | 5234 | ->bind_privilege(pr_all) |
b1615c74 JS |
5235 | ->bind(dw); |
5236 | root->bind_str(TOK_PROVIDER)->bind_str(TOK_MARK) | |
f66bb29a | 5237 | ->bind_privilege(pr_all) |
b1615c74 JS |
5238 | ->bind(dw); |
5239 | } | |
5240 | ||
5241 | void | |
5242 | dwarf_derived_probe::register_plt_variants(systemtap_session& s, | |
5243 | match_node * root, | |
5244 | dwarf_builder * dw) | |
5245 | { | |
5246 | root->bind(TOK_PLT) | |
f66bb29a | 5247 | ->bind_privilege(pr_all) |
b1615c74 JS |
5248 | ->bind(dw); |
5249 | root->bind_str(TOK_PLT) | |
f66bb29a | 5250 | ->bind_privilege(pr_all) |
b1615c74 JS |
5251 | ->bind(dw); |
5252 | root->bind(TOK_PLT)->bind_num(TOK_STATEMENT) | |
f66bb29a | 5253 | ->bind_privilege(pr_all) |
b1615c74 JS |
5254 | ->bind(dw); |
5255 | root->bind_str(TOK_PLT)->bind_num(TOK_STATEMENT) | |
f66bb29a | 5256 | ->bind_privilege(pr_all) |
b1615c74 | 5257 | ->bind(dw); |
bd2b1e68 GH |
5258 | } |
5259 | ||
5260 | void | |
c4ce66a1 | 5261 | dwarf_derived_probe::register_patterns(systemtap_session& s) |
bd2b1e68 | 5262 | { |
c4ce66a1 | 5263 | match_node* root = s.pattern_root; |
bd2b1e68 GH |
5264 | dwarf_builder *dw = new dwarf_builder(); |
5265 | ||
c4ce66a1 JS |
5266 | update_visitor *filter = new dwarf_cast_expanding_visitor(s, *dw); |
5267 | s.code_filters.push_back(filter); | |
5268 | ||
bd1fcbad YZ |
5269 | filter = new dwarf_atvar_expanding_visitor(s, *dw); |
5270 | s.code_filters.push_back(filter); | |
5271 | ||
73f52eb4 DB |
5272 | register_function_and_statement_variants(s, root->bind(TOK_KERNEL), dw, pr_privileged); |
5273 | register_function_and_statement_variants(s, root->bind_str(TOK_MODULE), dw, pr_privileged); | |
27dc09b1 DB |
5274 | root->bind(TOK_KERNEL)->bind_num(TOK_STATEMENT)->bind(TOK_ABSOLUTE) |
5275 | ->bind(dw); | |
2cab6244 | 5276 | |
7f02ca94 JS |
5277 | match_node* uprobes[] = { |
5278 | root->bind(TOK_PROCESS), | |
5279 | root->bind_str(TOK_PROCESS), | |
5c6f9e92 | 5280 | root->bind_num(TOK_PROCESS), |
7f02ca94 JS |
5281 | root->bind(TOK_PROCESS)->bind_str(TOK_LIBRARY), |
5282 | root->bind_str(TOK_PROCESS)->bind_str(TOK_LIBRARY), | |
5283 | }; | |
5284 | for (size_t i = 0; i < sizeof(uprobes) / sizeof(*uprobes); ++i) | |
5285 | { | |
f66bb29a | 5286 | register_function_and_statement_variants(s, uprobes[i], dw, pr_all); |
7f02ca94 JS |
5287 | register_sdt_variants(s, uprobes[i], dw); |
5288 | register_plt_variants(s, uprobes[i], dw); | |
5289 | } | |
bd2b1e68 GH |
5290 | } |
5291 | ||
9020300d | 5292 | void |
3689db05 SC |
5293 | dwarf_derived_probe::emit_probe_local_init(systemtap_session& s, translator_output * o) |
5294 | { | |
698de6cc | 5295 | std::set<derived_probe*>::iterator pcii; |
3689db05 SC |
5296 | for (pcii = perf_counter_refs.begin(); |
5297 | pcii != perf_counter_refs.end(); | |
5298 | pcii++) | |
5299 | { | |
5300 | map<string, pair<string,derived_probe*> >::iterator it; | |
5301 | // Find the associated perf.counter probe | |
5302 | unsigned i = 0; | |
5303 | for (it=s.perf_counters.begin() ; | |
5304 | it != s.perf_counters.end(); | |
5305 | it++, i++) | |
5306 | if ((*it).second.second == (*pcii)) | |
5307 | break; | |
5308 | // place the perf counter read so it precedes stp_lock_probe | |
5309 | o->newline() << "l->l___perf_read_" + (*it).first | |
5310 | + " = (((int64_t) (_stp_perf_read(smp_processor_id()," | |
5311 | + lex_cast(i) + "))));"; | |
5312 | } | |
b78a0fbb | 5313 | |
b95e2b79 MH |
5314 | if (access_vars) |
5315 | { | |
5316 | // if accessing $variables, emit bsp cache setup for speeding up | |
d4670309 | 5317 | o->newline() << "#if defined __ia64__"; |
d9aed31e | 5318 | o->newline() << "bspcache(c->unwaddr, c->kregs);"; |
d4670309 | 5319 | o->newline() << "#endif"; |
b95e2b79 | 5320 | } |
9020300d | 5321 | } |
2930abc7 | 5322 | |
b20febf3 | 5323 | // ------------------------------------------------------------------------ |
46b84a80 DS |
5324 | |
5325 | void | |
b20febf3 | 5326 | dwarf_derived_probe_group::enroll (dwarf_derived_probe* p) |
46b84a80 | 5327 | { |
b20febf3 | 5328 | probes_by_module.insert (make_pair (p->module, p)); |
b8da0ad1 FCE |
5329 | |
5330 | // XXX: probes put at the same address should all share a | |
5331 | // single kprobe/kretprobe, and have their handlers executed | |
5332 | // sequentially. | |
b55bc428 FCE |
5333 | } |
5334 | ||
7a053d3b | 5335 | void |
775d51e5 | 5336 | dwarf_derived_probe_group::emit_module_decls (systemtap_session& s) |
ec4373ff | 5337 | { |
b20febf3 | 5338 | if (probes_by_module.empty()) return; |
2930abc7 | 5339 | |
775d51e5 DS |
5340 | s.op->newline() << "/* ---- dwarf probes ---- */"; |
5341 | ||
5342 | // Warn of misconfigured kernels | |
f41595cc FCE |
5343 | s.op->newline() << "#if ! defined(CONFIG_KPROBES)"; |
5344 | s.op->newline() << "#error \"Need CONFIG_KPROBES!\""; | |
5345 | s.op->newline() << "#endif"; | |
775d51e5 | 5346 | s.op->newline(); |
f41595cc | 5347 | |
f07c3b68 | 5348 | s.op->newline() << "#ifndef KRETACTIVE"; |
1ee6b5fc | 5349 | s.op->newline() << "#define KRETACTIVE (max(15,6*(int)num_possible_cpus()))"; |
f07c3b68 FCE |
5350 | s.op->newline() << "#endif"; |
5351 | ||
14cf7e42 | 5352 | // Forward decls |
2ba1736a | 5353 | s.op->newline() << "#include \"linux/kprobes-common.h\""; |
14cf7e42 | 5354 | |
b20febf3 FCE |
5355 | // Forward declare the master entry functions |
5356 | s.op->newline() << "static int enter_kprobe_probe (struct kprobe *inst,"; | |
5357 | s.op->line() << " struct pt_regs *regs);"; | |
5358 | s.op->newline() << "static int enter_kretprobe_probe (struct kretprobe_instance *inst,"; | |
5359 | s.op->line() << " struct pt_regs *regs);"; | |
5360 | ||
42cb22bd MH |
5361 | // Emit an array of kprobe/kretprobe pointers |
5362 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
5363 | s.op->newline() << "static void * stap_unreg_kprobes[" << probes_by_module.size() << "];"; | |
5364 | s.op->newline() << "#endif"; | |
5365 | ||
b20febf3 | 5366 | // Emit the actual probe list. |
606fd9c8 FCE |
5367 | |
5368 | // NB: we used to plop a union { struct kprobe; struct kretprobe } into | |
5369 | // struct stap_dwarf_probe, but it being initialized data makes it add | |
5370 | // hundreds of bytes of padding per stap_dwarf_probe. (PR5673) | |
14cf7e42 | 5371 | s.op->newline() << "static struct stap_dwarf_kprobe stap_dwarf_kprobes[" << probes_by_module.size() << "];"; |
606fd9c8 FCE |
5372 | // NB: bss! |
5373 | ||
4c2732a1 | 5374 | s.op->newline() << "static struct stap_dwarf_probe {"; |
b0986e7a DS |
5375 | s.op->newline(1) << "const unsigned return_p:1;"; |
5376 | s.op->newline() << "const unsigned maxactive_p:1;"; | |
b350f56b | 5377 | s.op->newline() << "const unsigned optional_p:1;"; |
b20febf3 | 5378 | s.op->newline() << "unsigned registered_p:1;"; |
b0986e7a | 5379 | s.op->newline() << "const unsigned short maxactive_val;"; |
606fd9c8 | 5380 | |
af234c40 JS |
5381 | // data saved in the kretprobe_instance packet |
5382 | s.op->newline() << "const unsigned short saved_longs;"; | |
5383 | s.op->newline() << "const unsigned short saved_strings;"; | |
5384 | ||
faea5e16 | 5385 | // Let's find some stats for the embedded strings. Maybe they |
606fd9c8 FCE |
5386 | // are small and uniform enough to justify putting char[MAX]'s into |
5387 | // the array instead of relocated char*'s. | |
faea5e16 JS |
5388 | size_t module_name_max = 0, section_name_max = 0; |
5389 | size_t module_name_tot = 0, section_name_tot = 0; | |
606fd9c8 FCE |
5390 | size_t all_name_cnt = probes_by_module.size(); // for average |
5391 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) | |
5392 | { | |
5393 | dwarf_derived_probe* p = it->second; | |
5394 | #define DOIT(var,expr) do { \ | |
5395 | size_t var##_size = (expr) + 1; \ | |
5396 | var##_max = max (var##_max, var##_size); \ | |
5397 | var##_tot += var##_size; } while (0) | |
5398 | DOIT(module_name, p->module.size()); | |
5399 | DOIT(section_name, p->section.size()); | |
606fd9c8 FCE |
5400 | #undef DOIT |
5401 | } | |
5402 | ||
5403 | // Decide whether it's worthwhile to use char[] or char* by comparing | |
5404 | // the amount of average waste (max - avg) to the relocation data size | |
5405 | // (3 native long words). | |
5406 | #define CALCIT(var) \ | |
5407 | if ((var##_name_max-(var##_name_tot/all_name_cnt)) < (3 * sizeof(void*))) \ | |
5408 | { \ | |
5409 | s.op->newline() << "const char " << #var << "[" << var##_name_max << "];"; \ | |
5410 | if (s.verbose > 2) clog << "stap_dwarf_probe " << #var \ | |
5411 | << "[" << var##_name_max << "]" << endl; \ | |
5412 | } \ | |
5413 | else \ | |
5414 | { \ | |
b0986e7a | 5415 | s.op->newline() << "const char * const " << #var << ";"; \ |
606fd9c8 FCE |
5416 | if (s.verbose > 2) clog << "stap_dwarf_probe *" << #var << endl; \ |
5417 | } | |
5418 | ||
5419 | CALCIT(module); | |
5420 | CALCIT(section); | |
e6fe60e7 | 5421 | #undef CALCIT |
606fd9c8 | 5422 | |
b0986e7a | 5423 | s.op->newline() << "const unsigned long address;"; |
7c3e97f4 JS |
5424 | s.op->newline() << "const struct stap_probe * const probe;"; |
5425 | s.op->newline() << "const struct stap_probe * const entry_probe;"; | |
b20febf3 FCE |
5426 | s.op->newline(-1) << "} stap_dwarf_probes[] = {"; |
5427 | s.op->indent(1); | |
5428 | ||
5429 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) | |
2930abc7 | 5430 | { |
b20febf3 FCE |
5431 | dwarf_derived_probe* p = it->second; |
5432 | s.op->newline() << "{"; | |
5433 | if (p->has_return) | |
5434 | s.op->line() << " .return_p=1,"; | |
c9bad430 | 5435 | if (p->has_maxactive) |
606fd9c8 FCE |
5436 | { |
5437 | s.op->line() << " .maxactive_p=1,"; | |
5438 | assert (p->maxactive_val >= 0 && p->maxactive_val <= USHRT_MAX); | |
5439 | s.op->line() << " .maxactive_val=" << p->maxactive_val << ","; | |
5440 | } | |
af234c40 JS |
5441 | if (p->saved_longs || p->saved_strings) |
5442 | { | |
5443 | if (p->saved_longs) | |
5444 | s.op->line() << " .saved_longs=" << p->saved_longs << ","; | |
5445 | if (p->saved_strings) | |
5446 | s.op->line() << " .saved_strings=" << p->saved_strings << ","; | |
5447 | if (p->entry_handler) | |
c87ae2c1 | 5448 | s.op->line() << " .entry_probe=" << common_probe_init (p->entry_handler) << ","; |
af234c40 | 5449 | } |
b350f56b JS |
5450 | if (p->locations[0]->optional) |
5451 | s.op->line() << " .optional_p=1,"; | |
dc38c256 | 5452 | s.op->line() << " .address=(unsigned long)0x" << hex << p->addr << dec << "ULL,"; |
84048984 FCE |
5453 | s.op->line() << " .module=\"" << p->module << "\","; |
5454 | s.op->line() << " .section=\"" << p->section << "\","; | |
faea5e16 | 5455 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
b20febf3 | 5456 | s.op->line() << " },"; |
2930abc7 | 5457 | } |
2930abc7 | 5458 | |
b20febf3 FCE |
5459 | s.op->newline(-1) << "};"; |
5460 | ||
5461 | // Emit the kprobes callback function | |
5462 | s.op->newline(); | |
5463 | s.op->newline() << "static int enter_kprobe_probe (struct kprobe *inst,"; | |
5464 | s.op->line() << " struct pt_regs *regs) {"; | |
606fd9c8 FCE |
5465 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS |
5466 | s.op->newline(1) << "int kprobe_idx = ((uintptr_t)inst-(uintptr_t)stap_dwarf_kprobes)/sizeof(struct stap_dwarf_kprobe);"; | |
5467 | // Check that the index is plausible | |
5468 | s.op->newline() << "struct stap_dwarf_probe *sdp = &stap_dwarf_probes["; | |
5469 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
5470 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
5471 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
5472 | s.op->line() << "];"; | |
71db462b | 5473 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sdp->probe", |
cda141c2 | 5474 | "stp_probe_type_kprobe"); |
d9aed31e | 5475 | s.op->newline() << "c->kregs = regs;"; |
6415ddde MW |
5476 | |
5477 | // Make it look like the IP is set as it wouldn't have been replaced | |
5478 | // by a breakpoint instruction when calling real probe handler. Reset | |
5479 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
5480 | s.op->newline() << "{"; | |
5481 | s.op->indent(1); | |
d9aed31e | 5482 | s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
259d54c0 | 5483 | s.op->newline() << "SET_REG_IP(regs, (unsigned long) inst->addr);"; |
26e63673 | 5484 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
259d54c0 | 5485 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
5486 | s.op->newline(-1) << "}"; |
5487 | ||
f887a8c9 | 5488 | common_probe_entryfn_epilogue (s, true); |
b20febf3 FCE |
5489 | s.op->newline() << "return 0;"; |
5490 | s.op->newline(-1) << "}"; | |
5491 | ||
5492 | // Same for kretprobes | |
5493 | s.op->newline(); | |
af234c40 JS |
5494 | s.op->newline() << "static int enter_kretprobe_common (struct kretprobe_instance *inst,"; |
5495 | s.op->line() << " struct pt_regs *regs, int entry) {"; | |
b20febf3 | 5496 | s.op->newline(1) << "struct kretprobe *krp = inst->rp;"; |
606fd9c8 FCE |
5497 | |
5498 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS | |
a36378d7 | 5499 | s.op->newline() << "int kprobe_idx = ((uintptr_t)krp-(uintptr_t)stap_dwarf_kprobes)/sizeof(struct stap_dwarf_kprobe);"; |
606fd9c8 FCE |
5500 | // Check that the index is plausible |
5501 | s.op->newline() << "struct stap_dwarf_probe *sdp = &stap_dwarf_probes["; | |
5502 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
5503 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
5504 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
5505 | s.op->line() << "];"; | |
5506 | ||
7c3e97f4 | 5507 | s.op->newline() << "const struct stap_probe *sp = entry ? sdp->entry_probe : sdp->probe;"; |
c87ae2c1 JS |
5508 | s.op->newline() << "if (sp) {"; |
5509 | s.op->indent(1); | |
71db462b | 5510 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sp", |
cda141c2 | 5511 | "stp_probe_type_kretprobe"); |
d9aed31e | 5512 | s.op->newline() << "c->kregs = regs;"; |
af234c40 JS |
5513 | |
5514 | // for assisting runtime's backtrace logic and accessing kretprobe data packets | |
6dceb5c9 MW |
5515 | s.op->newline() << "c->ips.krp.pi = inst;"; |
5516 | s.op->newline() << "c->ips.krp.pi_longs = sdp->saved_longs;"; | |
6415ddde MW |
5517 | |
5518 | // Make it look like the IP is set as it wouldn't have been replaced | |
5519 | // by a breakpoint instruction when calling real probe handler. Reset | |
5520 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
5521 | s.op->newline() << "{"; | |
d9aed31e | 5522 | s.op->newline(1) << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
c87ae2c1 JS |
5523 | s.op->newline() << "if (entry)"; |
5524 | s.op->newline(1) << "SET_REG_IP(regs, (unsigned long) inst->rp->kp.addr);"; | |
5525 | s.op->newline(-1) << "else"; | |
5526 | s.op->newline(1) << "SET_REG_IP(regs, (unsigned long)inst->ret_addr);"; | |
5527 | s.op->newline(-1) << "(sp->ph) (c);"; | |
259d54c0 | 5528 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
5529 | s.op->newline(-1) << "}"; |
5530 | ||
f887a8c9 | 5531 | common_probe_entryfn_epilogue (s, true); |
c87ae2c1 | 5532 | s.op->newline(-1) << "}"; |
b20febf3 FCE |
5533 | s.op->newline() << "return 0;"; |
5534 | s.op->newline(-1) << "}"; | |
af234c40 JS |
5535 | |
5536 | s.op->newline(); | |
5537 | s.op->newline() << "static int enter_kretprobe_probe (struct kretprobe_instance *inst,"; | |
5538 | s.op->line() << " struct pt_regs *regs) {"; | |
5539 | s.op->newline(1) << "return enter_kretprobe_common(inst, regs, 0);"; | |
5540 | s.op->newline(-1) << "}"; | |
5541 | ||
5542 | s.op->newline(); | |
5543 | s.op->newline() << "static int enter_kretprobe_entry_probe (struct kretprobe_instance *inst,"; | |
5544 | s.op->line() << " struct pt_regs *regs) {"; | |
5545 | s.op->newline(1) << "return enter_kretprobe_common(inst, regs, 1);"; | |
5546 | s.op->newline(-1) << "}"; | |
b642c901 | 5547 | |
14cf7e42 | 5548 | s.op->newline(); |
20c6c071 | 5549 | } |
ec4373ff | 5550 | |
20c6c071 | 5551 | |
dc38c0ae | 5552 | void |
b20febf3 FCE |
5553 | dwarf_derived_probe_group::emit_module_init (systemtap_session& s) |
5554 | { | |
5555 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5556 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
a36378d7 | 5557 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; |
a049e342 | 5558 | s.op->newline() << "unsigned long relocated_addr = _stp_kmodule_relocate (sdp->module, sdp->section, sdp->address);"; |
b20febf3 | 5559 | s.op->newline() << "if (relocated_addr == 0) continue;"; // quietly; assume module is absent |
26e63673 | 5560 | s.op->newline() << "probe_point = sdp->probe->pp;"; // for error messages |
b20febf3 | 5561 | s.op->newline() << "if (sdp->return_p) {"; |
606fd9c8 | 5562 | s.op->newline(1) << "kp->u.krp.kp.addr = (void *) relocated_addr;"; |
c9bad430 | 5563 | s.op->newline() << "if (sdp->maxactive_p) {"; |
606fd9c8 | 5564 | s.op->newline(1) << "kp->u.krp.maxactive = sdp->maxactive_val;"; |
c9bad430 | 5565 | s.op->newline(-1) << "} else {"; |
f07c3b68 | 5566 | s.op->newline(1) << "kp->u.krp.maxactive = KRETACTIVE;"; |
c9bad430 | 5567 | s.op->newline(-1) << "}"; |
606fd9c8 | 5568 | s.op->newline() << "kp->u.krp.handler = &enter_kretprobe_probe;"; |
af234c40 | 5569 | s.op->newline() << "#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)"; |
c87ae2c1 | 5570 | s.op->newline() << "if (sdp->entry_probe) {"; |
af234c40 JS |
5571 | s.op->newline(1) << "kp->u.krp.entry_handler = &enter_kretprobe_entry_probe;"; |
5572 | s.op->newline() << "kp->u.krp.data_size = sdp->saved_longs * sizeof(int64_t) + "; | |
5573 | s.op->newline() << " sdp->saved_strings * MAXSTRINGLEN;"; | |
5574 | s.op->newline(-1) << "}"; | |
5575 | s.op->newline() << "#endif"; | |
e4cb375f MH |
5576 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 |
5577 | s.op->newline() << "#ifdef __ia64__"; | |
5578 | s.op->newline() << "kp->dummy.addr = kp->u.krp.kp.addr;"; | |
5579 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
5580 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
5581 | s.op->newline() << "if (rc == 0) {"; | |
5582 | s.op->newline(1) << "rc = register_kretprobe (& kp->u.krp);"; | |
5583 | s.op->newline() << "if (rc != 0)"; | |
5584 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
5585 | s.op->newline(-2) << "}"; | |
5586 | s.op->newline() << "#else"; | |
606fd9c8 | 5587 | s.op->newline() << "rc = register_kretprobe (& kp->u.krp);"; |
e4cb375f | 5588 | s.op->newline() << "#endif"; |
b20febf3 | 5589 | s.op->newline(-1) << "} else {"; |
e4cb375f | 5590 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 |
606fd9c8 FCE |
5591 | s.op->newline(1) << "kp->u.kp.addr = (void *) relocated_addr;"; |
5592 | s.op->newline() << "kp->u.kp.pre_handler = &enter_kprobe_probe;"; | |
e4cb375f MH |
5593 | s.op->newline() << "#ifdef __ia64__"; |
5594 | s.op->newline() << "kp->dummy.addr = kp->u.kp.addr;"; | |
5595 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
5596 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
5597 | s.op->newline() << "if (rc == 0) {"; | |
5598 | s.op->newline(1) << "rc = register_kprobe (& kp->u.kp);"; | |
5599 | s.op->newline() << "if (rc != 0)"; | |
5600 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
5601 | s.op->newline(-2) << "}"; | |
5602 | s.op->newline() << "#else"; | |
606fd9c8 | 5603 | s.op->newline() << "rc = register_kprobe (& kp->u.kp);"; |
e4cb375f | 5604 | s.op->newline() << "#endif"; |
b20febf3 | 5605 | s.op->newline(-1) << "}"; |
9063462a FCE |
5606 | s.op->newline() << "if (rc) {"; // PR6749: tolerate a failed register_*probe. |
5607 | s.op->newline(1) << "sdp->registered_p = 0;"; | |
b350f56b | 5608 | s.op->newline() << "if (!sdp->optional_p)"; |
50b6acf7 | 5609 | s.op->newline(1) << "_stp_warn (\"probe %s (address 0x%lx) registration error (rc %d)\", probe_point, (unsigned long) relocated_addr, rc);"; |
b350f56b | 5610 | s.op->newline(-1) << "rc = 0;"; // continue with other probes |
9063462a FCE |
5611 | // XXX: shall we increment numskipped? |
5612 | s.op->newline(-1) << "}"; | |
5613 | ||
5614 | #if 0 /* pre PR 6749; XXX consider making an option */ | |
c48cb0cc | 5615 | s.op->newline(1) << "for (j=i-1; j>=0; j--) {"; // partial rollback |
b20febf3 | 5616 | s.op->newline(1) << "struct stap_dwarf_probe *sdp2 = & stap_dwarf_probes[j];"; |
606fd9c8 FCE |
5617 | s.op->newline() << "struct stap_dwarf_kprobe *kp2 = & stap_dwarf_kprobes[j];"; |
5618 | s.op->newline() << "if (sdp2->return_p) unregister_kretprobe (&kp2->u.krp);"; | |
5619 | s.op->newline() << "else unregister_kprobe (&kp2->u.kp);"; | |
e4cb375f MH |
5620 | s.op->newline() << "#ifdef __ia64__"; |
5621 | s.op->newline() << "unregister_kprobe (&kp2->dummy);"; | |
5622 | s.op->newline() << "#endif"; | |
c48cb0cc FCE |
5623 | // NB: we don't have to clear sdp2->registered_p, since the module_exit code is |
5624 | // not run for this early-abort case. | |
5625 | s.op->newline(-1) << "}"; | |
5626 | s.op->newline() << "break;"; // don't attempt to register any more probes | |
b20febf3 | 5627 | s.op->newline(-1) << "}"; |
9063462a FCE |
5628 | #endif |
5629 | ||
b20febf3 FCE |
5630 | s.op->newline() << "else sdp->registered_p = 1;"; |
5631 | s.op->newline(-1) << "}"; // for loop | |
dc38c0ae DS |
5632 | } |
5633 | ||
5634 | ||
b4be7cbc FCE |
5635 | void |
5636 | dwarf_derived_probe_group::emit_module_refresh (systemtap_session& s) | |
5637 | { | |
5638 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5639 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5640 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5641 | s.op->newline() << "unsigned long relocated_addr = _stp_kmodule_relocate (sdp->module, sdp->section, sdp->address);"; | |
5642 | s.op->newline() << "int rc;"; | |
5643 | ||
5644 | // new module arrived? | |
5645 | s.op->newline() << "if (sdp->registered_p == 0 && relocated_addr != 0) {"; | |
5646 | s.op->newline(1) << "if (sdp->return_p) {"; | |
5647 | s.op->newline(1) << "kp->u.krp.kp.addr = (void *) relocated_addr;"; | |
5648 | s.op->newline() << "if (sdp->maxactive_p) {"; | |
5649 | s.op->newline(1) << "kp->u.krp.maxactive = sdp->maxactive_val;"; | |
5650 | s.op->newline(-1) << "} else {"; | |
5651 | s.op->newline(1) << "kp->u.krp.maxactive = KRETACTIVE;"; | |
5652 | s.op->newline(-1) << "}"; | |
5653 | s.op->newline() << "kp->u.krp.handler = &enter_kretprobe_probe;"; | |
5654 | s.op->newline() << "#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)"; | |
5655 | s.op->newline() << "if (sdp->entry_probe) {"; | |
5656 | s.op->newline(1) << "kp->u.krp.entry_handler = &enter_kretprobe_entry_probe;"; | |
5657 | s.op->newline() << "kp->u.krp.data_size = sdp->saved_longs * sizeof(int64_t) + "; | |
5658 | s.op->newline() << " sdp->saved_strings * MAXSTRINGLEN;"; | |
5659 | s.op->newline(-1) << "}"; | |
5660 | s.op->newline() << "#endif"; | |
5661 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 | |
5662 | s.op->newline() << "#ifdef __ia64__"; | |
5663 | s.op->newline() << "kp->dummy.addr = kp->u.krp.kp.addr;"; | |
5664 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
5665 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
5666 | s.op->newline() << "if (rc == 0) {"; | |
5667 | s.op->newline(1) << "rc = register_kretprobe (& kp->u.krp);"; | |
5668 | s.op->newline() << "if (rc != 0)"; | |
5669 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
5670 | s.op->newline(-2) << "}"; | |
5671 | s.op->newline() << "#else"; | |
5672 | s.op->newline() << "rc = register_kretprobe (& kp->u.krp);"; | |
5673 | s.op->newline() << "#endif"; | |
5674 | s.op->newline(-1) << "} else {"; | |
5675 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 | |
5676 | s.op->newline(1) << "kp->u.kp.addr = (void *) relocated_addr;"; | |
5677 | s.op->newline() << "kp->u.kp.pre_handler = &enter_kprobe_probe;"; | |
5678 | s.op->newline() << "#ifdef __ia64__"; | |
5679 | s.op->newline() << "kp->dummy.addr = kp->u.kp.addr;"; | |
5680 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
5681 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
5682 | s.op->newline() << "if (rc == 0) {"; | |
5683 | s.op->newline(1) << "rc = register_kprobe (& kp->u.kp);"; | |
5684 | s.op->newline() << "if (rc != 0)"; | |
5685 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
5686 | s.op->newline(-2) << "}"; | |
5687 | s.op->newline() << "#else"; | |
5688 | s.op->newline() << "rc = register_kprobe (& kp->u.kp);"; | |
5689 | s.op->newline() << "#endif"; | |
5690 | s.op->newline(-1) << "}"; | |
5691 | s.op->newline() << "if (rc == 0) sdp->registered_p = 1;"; | |
5692 | ||
5693 | // old module disappeared? | |
5694 | s.op->newline(-1) << "} else if (sdp->registered_p == 1 && relocated_addr == 0) {"; | |
5695 | s.op->newline(1) << "if (sdp->return_p) {"; | |
5696 | s.op->newline(1) << "unregister_kretprobe (&kp->u.krp);"; | |
065d5567 | 5697 | s.op->newline() << "atomic_add (kp->u.krp.nmissed, skipped_count());"; |
b4be7cbc FCE |
5698 | s.op->newline() << "#ifdef STP_TIMING"; |
5699 | s.op->newline() << "if (kp->u.krp.nmissed)"; | |
5700 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/1 on '%s': %d\\n\", sdp->probe->pp, kp->u.krp.nmissed);"; | |
5701 | s.op->newline(-1) << "#endif"; | |
065d5567 | 5702 | s.op->newline() << "atomic_add (kp->u.krp.kp.nmissed, skipped_count());"; |
b4be7cbc FCE |
5703 | s.op->newline() << "#ifdef STP_TIMING"; |
5704 | s.op->newline() << "if (kp->u.krp.kp.nmissed)"; | |
5705 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/2 on '%s': %lu\\n\", sdp->probe->pp, kp->u.krp.kp.nmissed);"; | |
5706 | s.op->newline(-1) << "#endif"; | |
5707 | s.op->newline(-1) << "} else {"; | |
5708 | s.op->newline(1) << "unregister_kprobe (&kp->u.kp);"; | |
065d5567 | 5709 | s.op->newline() << "atomic_add (kp->u.kp.nmissed, skipped_count());"; |
b4be7cbc FCE |
5710 | s.op->newline() << "#ifdef STP_TIMING"; |
5711 | s.op->newline() << "if (kp->u.kp.nmissed)"; | |
5712 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kprobe on '%s': %lu\\n\", sdp->probe->pp, kp->u.kp.nmissed);"; | |
5713 | s.op->newline(-1) << "#endif"; | |
5714 | s.op->newline(-1) << "}"; | |
5715 | s.op->newline() << "#if defined(__ia64__)"; | |
5716 | s.op->newline() << "unregister_kprobe (&kp->dummy);"; | |
5717 | s.op->newline() << "#endif"; | |
5718 | s.op->newline() << "sdp->registered_p = 0;"; | |
5719 | s.op->newline(-1) << "}"; | |
5720 | ||
5721 | s.op->newline(-1) << "}"; // for loop | |
5722 | } | |
5723 | ||
5724 | ||
5725 | ||
5726 | ||
46b84a80 | 5727 | void |
b20febf3 | 5728 | dwarf_derived_probe_group::emit_module_exit (systemtap_session& s) |
46b84a80 | 5729 | { |
42cb22bd MH |
5730 | //Unregister kprobes by batch interfaces. |
5731 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
5732 | s.op->newline() << "j = 0;"; | |
5733 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5734 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5735 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5736 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
5737 | s.op->newline() << "if (!sdp->return_p)"; | |
5738 | s.op->newline(1) << "stap_unreg_kprobes[j++] = &kp->u.kp;"; | |
5739 | s.op->newline(-2) << "}"; | |
5740 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes, j);"; | |
5741 | s.op->newline() << "j = 0;"; | |
5742 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5743 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5744 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5745 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
5746 | s.op->newline() << "if (sdp->return_p)"; | |
5747 | s.op->newline(1) << "stap_unreg_kprobes[j++] = &kp->u.krp;"; | |
5748 | s.op->newline(-2) << "}"; | |
5749 | s.op->newline() << "unregister_kretprobes((struct kretprobe **)stap_unreg_kprobes, j);"; | |
e4cb375f MH |
5750 | s.op->newline() << "#ifdef __ia64__"; |
5751 | s.op->newline() << "j = 0;"; | |
5752 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5753 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5754 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5755 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
5756 | s.op->newline() << "stap_unreg_kprobes[j++] = &kp->dummy;"; | |
5757 | s.op->newline(-1) << "}"; | |
5758 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes, j);"; | |
5759 | s.op->newline() << "#endif"; | |
42cb22bd MH |
5760 | s.op->newline() << "#endif"; |
5761 | ||
b20febf3 FCE |
5762 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
5763 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
a36378d7 | 5764 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; |
b20febf3 FCE |
5765 | s.op->newline() << "if (! sdp->registered_p) continue;"; |
5766 | s.op->newline() << "if (sdp->return_p) {"; | |
42cb22bd | 5767 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; |
606fd9c8 | 5768 | s.op->newline(1) << "unregister_kretprobe (&kp->u.krp);"; |
42cb22bd | 5769 | s.op->newline() << "#endif"; |
065d5567 | 5770 | s.op->newline() << "atomic_add (kp->u.krp.nmissed, skipped_count());"; |
73209876 FCE |
5771 | s.op->newline() << "#ifdef STP_TIMING"; |
5772 | s.op->newline() << "if (kp->u.krp.nmissed)"; | |
26e63673 | 5773 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/1 on '%s': %d\\n\", sdp->probe->pp, kp->u.krp.nmissed);"; |
73209876 | 5774 | s.op->newline(-1) << "#endif"; |
065d5567 | 5775 | s.op->newline() << "atomic_add (kp->u.krp.kp.nmissed, skipped_count());"; |
73209876 FCE |
5776 | s.op->newline() << "#ifdef STP_TIMING"; |
5777 | s.op->newline() << "if (kp->u.krp.kp.nmissed)"; | |
26e63673 | 5778 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/2 on '%s': %lu\\n\", sdp->probe->pp, kp->u.krp.kp.nmissed);"; |
73209876 | 5779 | s.op->newline(-1) << "#endif"; |
557fb7a8 | 5780 | s.op->newline(-1) << "} else {"; |
42cb22bd | 5781 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; |
606fd9c8 | 5782 | s.op->newline(1) << "unregister_kprobe (&kp->u.kp);"; |
42cb22bd | 5783 | s.op->newline() << "#endif"; |
065d5567 | 5784 | s.op->newline() << "atomic_add (kp->u.kp.nmissed, skipped_count());"; |
73209876 FCE |
5785 | s.op->newline() << "#ifdef STP_TIMING"; |
5786 | s.op->newline() << "if (kp->u.kp.nmissed)"; | |
26e63673 | 5787 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kprobe on '%s': %lu\\n\", sdp->probe->pp, kp->u.kp.nmissed);"; |
73209876 | 5788 | s.op->newline(-1) << "#endif"; |
b20febf3 | 5789 | s.op->newline(-1) << "}"; |
e4cb375f MH |
5790 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES) && defined(__ia64__)"; |
5791 | s.op->newline() << "unregister_kprobe (&kp->dummy);"; | |
5792 | s.op->newline() << "#endif"; | |
b20febf3 FCE |
5793 | s.op->newline() << "sdp->registered_p = 0;"; |
5794 | s.op->newline(-1) << "}"; | |
46b84a80 DS |
5795 | } |
5796 | ||
272c9036 WF |
5797 | static void sdt_v3_tokenize(const string& str, vector<string>& tokens) |
5798 | { | |
5799 | string::size_type pos; | |
5800 | string::size_type lastPos = str.find_first_not_of(" ", 0); | |
5801 | string::size_type nextAt = str.find("@", lastPos); | |
e9a90eee JS |
5802 | |
5803 | if (nextAt == string::npos) | |
5804 | { | |
5805 | // PR13934: Assembly probes are not forced to use the N@OP form. | |
5806 | // In this case, N is inferred to be the native word size. Since we | |
5807 | // don't have a nice delimiter, just split it on spaces. SDT-asm authors | |
5808 | // then must not put any spaces in arguments, to avoid ambiguity. | |
5809 | tokenize(str, tokens, " "); | |
5810 | return; | |
5811 | } | |
5812 | ||
272c9036 WF |
5813 | while (lastPos != string::npos) |
5814 | { | |
5815 | pos = nextAt + 1; | |
5816 | nextAt = str.find("@", pos); | |
5817 | if (nextAt == string::npos) | |
5818 | pos = string::npos; | |
5819 | else | |
5820 | pos = str.rfind(" ", nextAt); | |
5821 | ||
5822 | tokens.push_back(str.substr(lastPos, pos - lastPos)); | |
5823 | lastPos = str.find_first_not_of(" ", pos); | |
5824 | } | |
5825 | } | |
8aabf152 | 5826 | |
8aabf152 | 5827 | |
aff5d390 | 5828 | struct sdt_uprobe_var_expanding_visitor: public var_expanding_visitor |
7a05f484 | 5829 | { |
ae1418f0 | 5830 | enum regwidths {QI, QIh, HI, SI, DI}; |
f83336a5 | 5831 | sdt_uprobe_var_expanding_visitor(systemtap_session& s, |
b8688ee6 | 5832 | dwflpp& dw, |
f83336a5 FCE |
5833 | int elf_machine, |
5834 | const string & process_name, | |
a794dbeb | 5835 | const string & provider_name, |
aff5d390 | 5836 | const string & probe_name, |
71e5e13d | 5837 | stap_sdt_probe_type probe_type, |
aff5d390 | 5838 | const string & arg_string, |
8aabf152 | 5839 | int ac): |
b8688ee6 JL |
5840 | session (s), dw (dw), elf_machine (elf_machine), |
5841 | process_name (process_name), provider_name (provider_name), | |
5842 | probe_name (probe_name), probe_type (probe_type), arg_count ((unsigned) ac) | |
a8ec7719 | 5843 | { |
a57b7534 JL |
5844 | // sanity check that we're not somehow here for a kernel probe |
5845 | assert(is_user_module(process_name)); | |
5846 | ||
2e6d617a | 5847 | build_dwarf_registers(); |
f83336a5 | 5848 | |
ebbd2b45 | 5849 | need_debug_info = false; |
88e39987 | 5850 | if (probe_type == uprobe3_type) |
272c9036 WF |
5851 | { |
5852 | sdt_v3_tokenize(arg_string, arg_tokens); | |
5853 | assert(arg_count <= 12); | |
5854 | } | |
88e39987 | 5855 | else |
272c9036 WF |
5856 | { |
5857 | tokenize(arg_string, arg_tokens, " "); | |
5858 | assert(arg_count <= 10); | |
5859 | } | |
a8ec7719 | 5860 | } |
8aabf152 | 5861 | |
f83336a5 | 5862 | systemtap_session& session; |
b8688ee6 | 5863 | dwflpp& dw; |
332ba7e7 | 5864 | int elf_machine; |
aff5d390 | 5865 | const string & process_name; |
a794dbeb | 5866 | const string & provider_name; |
aff5d390 | 5867 | const string & probe_name; |
71e5e13d | 5868 | stap_sdt_probe_type probe_type; |
8aabf152 | 5869 | unsigned arg_count; |
aff5d390 | 5870 | vector<string> arg_tokens; |
2e6d617a | 5871 | |
46a94997 | 5872 | map<string, pair<unsigned,int> > dwarf_regs; |
2e6d617a JL |
5873 | string regnames; |
5874 | string percent_regnames; | |
5875 | ||
ebbd2b45 | 5876 | bool need_debug_info; |
aff5d390 | 5877 | |
2e6d617a | 5878 | void build_dwarf_registers(); |
aff5d390 | 5879 | void visit_target_symbol (target_symbol* e); |
03c45fcb | 5880 | unsigned get_target_symbol_argno_and_validate (target_symbol* e); |
ac074daf | 5881 | long parse_out_arg_precision(string& asmarg); |
0fbf6fb8 JL |
5882 | expression* try_parse_arg_literal (target_symbol *e, |
5883 | const string& asmarg, | |
5884 | long precision); | |
95b78bc9 JL |
5885 | expression* try_parse_arg_register (target_symbol *e, |
5886 | const string& asmarg, | |
5887 | long precision); | |
8da56b62 JL |
5888 | expression* try_parse_arg_offset_register (target_symbol *e, |
5889 | const string& asmarg, | |
5890 | long precision); | |
10fcca15 JL |
5891 | expression* try_parse_arg_effective_addr (target_symbol *e, |
5892 | const string& asmarg, | |
5893 | long precision); | |
451c0c25 JL |
5894 | expression* try_parse_arg_varname (target_symbol *e, |
5895 | const string& asmarg, | |
5896 | long precision); | |
6ef331c8 SC |
5897 | void visit_target_symbol_arg (target_symbol* e); |
5898 | void visit_target_symbol_context (target_symbol* e); | |
bd1fcbad | 5899 | void visit_atvar_op (atvar_op* e); |
40a0c64e | 5900 | void visit_cast_op (cast_op* e); |
aff5d390 SC |
5901 | }; |
5902 | ||
2e6d617a JL |
5903 | void |
5904 | sdt_uprobe_var_expanding_visitor::build_dwarf_registers () | |
5905 | { | |
5906 | /* Register name mapping table depends on the elf machine of this particular | |
5907 | probe target process/file, not upon the host. So we can't just | |
5908 | #ifdef _i686_ etc. */ | |
5909 | ||
5910 | #define DRI(name,num,width) dwarf_regs[name]=make_pair(num,width) | |
5911 | if (elf_machine == EM_X86_64) { | |
5912 | DRI ("%rax", 0, DI); DRI ("%eax", 0, SI); DRI ("%ax", 0, HI); | |
5913 | DRI ("%al", 0, QI); DRI ("%ah", 0, QIh); | |
5914 | DRI ("%rdx", 1, DI); DRI ("%edx", 1, SI); DRI ("%dx", 1, HI); | |
5915 | DRI ("%dl", 1, QI); DRI ("%dh", 1, QIh); | |
5916 | DRI ("%rcx", 2, DI); DRI ("%ecx", 2, SI); DRI ("%cx", 2, HI); | |
5917 | DRI ("%cl", 2, QI); DRI ("%ch", 2, QIh); | |
5918 | DRI ("%rbx", 3, DI); DRI ("%ebx", 3, SI); DRI ("%bx", 3, HI); | |
5919 | DRI ("%bl", 3, QI); DRI ("%bh", 3, QIh); | |
5920 | DRI ("%rsi", 4, DI); DRI ("%esi", 4, SI); DRI ("%si", 4, HI); | |
5921 | DRI ("%sil", 4, QI); | |
5922 | DRI ("%rdi", 5, DI); DRI ("%edi", 5, SI); DRI ("%di", 5, HI); | |
5923 | DRI ("%dil", 5, QI); | |
5924 | DRI ("%rbp", 6, DI); DRI ("%ebp", 6, SI); DRI ("%bp", 6, HI); | |
5925 | DRI ("%bpl", 6, QI); | |
5926 | DRI ("%rsp", 7, DI); DRI ("%esp", 7, SI); DRI ("%sp", 7, HI); | |
5927 | DRI ("%spl", 7, QI); | |
5928 | DRI ("%r8", 8, DI); DRI ("%r8d", 8, SI); DRI ("%r8w", 8, HI); | |
5929 | DRI ("%r8b", 8, QI); | |
5930 | DRI ("%r9", 9, DI); DRI ("%r9d", 9, SI); DRI ("%r9w", 9, HI); | |
5931 | DRI ("%r9b", 9, QI); | |
5932 | DRI ("%r10", 10, DI); DRI ("%r10d", 10, SI); DRI ("%r10w", 10, HI); | |
5933 | DRI ("%r10b", 10, QI); | |
5934 | DRI ("%r11", 11, DI); DRI ("%r11d", 11, SI); DRI ("%r11w", 11, HI); | |
5935 | DRI ("%r11b", 11, QI); | |
5936 | DRI ("%r12", 12, DI); DRI ("%r12d", 12, SI); DRI ("%r12w", 12, HI); | |
5937 | DRI ("%r12b", 12, QI); | |
5938 | DRI ("%r13", 13, DI); DRI ("%r13d", 13, SI); DRI ("%r13w", 13, HI); | |
5939 | DRI ("%r13b", 13, QI); | |
5940 | DRI ("%r14", 14, DI); DRI ("%r14d", 14, SI); DRI ("%r14w", 14, HI); | |
5941 | DRI ("%r14b", 14, QI); | |
5942 | DRI ("%r15", 15, DI); DRI ("%r15d", 15, SI); DRI ("%r15w", 15, HI); | |
5943 | DRI ("%r15b", 15, QI); | |
5944 | DRI ("%rip", 16, DI); DRI ("%eip", 16, SI); DRI ("%ip", 16, HI); | |
5945 | } else if (elf_machine == EM_386) { | |
5946 | DRI ("%eax", 0, SI); DRI ("%ax", 0, HI); DRI ("%al", 0, QI); | |
5947 | DRI ("%ah", 0, QIh); | |
5948 | DRI ("%ecx", 1, SI); DRI ("%cx", 1, HI); DRI ("%cl", 1, QI); | |
5949 | DRI ("%ch", 1, QIh); | |
5950 | DRI ("%edx", 2, SI); DRI ("%dx", 2, HI); DRI ("%dl", 2, QI); | |
5951 | DRI ("%dh", 2, QIh); | |
5952 | DRI ("%ebx", 3, SI); DRI ("%bx", 3, HI); DRI ("%bl", 3, QI); | |
5953 | DRI ("%bh", 3, QIh); | |
5954 | DRI ("%esp", 4, SI); DRI ("%sp", 4, HI); | |
5955 | DRI ("%ebp", 5, SI); DRI ("%bp", 5, HI); | |
5956 | DRI ("%esi", 6, SI); DRI ("%si", 6, HI); DRI ("%sil", 6, QI); | |
5957 | DRI ("%edi", 7, SI); DRI ("%di", 7, HI); DRI ("%dil", 7, QI); | |
5958 | } else if (elf_machine == EM_PPC || elf_machine == EM_PPC64) { | |
5959 | DRI ("%r0", 0, DI); | |
5960 | DRI ("%r1", 1, DI); | |
5961 | DRI ("%r2", 2, DI); | |
5962 | DRI ("%r3", 3, DI); | |
5963 | DRI ("%r4", 4, DI); | |
5964 | DRI ("%r5", 5, DI); | |
5965 | DRI ("%r6", 6, DI); | |
5966 | DRI ("%r7", 7, DI); | |
5967 | DRI ("%r8", 8, DI); | |
5968 | DRI ("%r9", 9, DI); | |
5969 | DRI ("%r10", 10, DI); | |
5970 | DRI ("%r11", 11, DI); | |
5971 | DRI ("%r12", 12, DI); | |
5972 | DRI ("%r13", 13, DI); | |
5973 | DRI ("%r14", 14, DI); | |
5974 | DRI ("%r15", 15, DI); | |
5975 | DRI ("%r16", 16, DI); | |
5976 | DRI ("%r17", 17, DI); | |
5977 | DRI ("%r18", 18, DI); | |
5978 | DRI ("%r19", 19, DI); | |
5979 | DRI ("%r20", 20, DI); | |
5980 | DRI ("%r21", 21, DI); | |
5981 | DRI ("%r22", 22, DI); | |
5982 | DRI ("%r23", 23, DI); | |
5983 | DRI ("%r24", 24, DI); | |
5984 | DRI ("%r25", 25, DI); | |
5985 | DRI ("%r26", 26, DI); | |
5986 | DRI ("%r27", 27, DI); | |
5987 | DRI ("%r28", 28, DI); | |
5988 | DRI ("%r29", 29, DI); | |
5989 | DRI ("%r30", 30, DI); | |
5990 | DRI ("%r31", 31, DI); | |
5991 | // PR11821: unadorned register "names" without -mregnames | |
5992 | DRI ("0", 0, DI); | |
5993 | DRI ("1", 1, DI); | |
5994 | DRI ("2", 2, DI); | |
5995 | DRI ("3", 3, DI); | |
5996 | DRI ("4", 4, DI); | |
5997 | DRI ("5", 5, DI); | |
5998 | DRI ("6", 6, DI); | |
5999 | DRI ("7", 7, DI); | |
6000 | DRI ("8", 8, DI); | |
6001 | DRI ("9", 9, DI); | |
6002 | DRI ("10", 10, DI); | |
6003 | DRI ("11", 11, DI); | |
6004 | DRI ("12", 12, DI); | |
6005 | DRI ("13", 13, DI); | |
6006 | DRI ("14", 14, DI); | |
6007 | DRI ("15", 15, DI); | |
6008 | DRI ("16", 16, DI); | |
6009 | DRI ("17", 17, DI); | |
6010 | DRI ("18", 18, DI); | |
6011 | DRI ("19", 19, DI); | |
6012 | DRI ("20", 20, DI); | |
6013 | DRI ("21", 21, DI); | |
6014 | DRI ("22", 22, DI); | |
6015 | DRI ("23", 23, DI); | |
6016 | DRI ("24", 24, DI); | |
6017 | DRI ("25", 25, DI); | |
6018 | DRI ("26", 26, DI); | |
6019 | DRI ("27", 27, DI); | |
6020 | DRI ("28", 28, DI); | |
6021 | DRI ("29", 29, DI); | |
6022 | DRI ("30", 30, DI); | |
6023 | DRI ("31", 31, DI); | |
6024 | } else if (elf_machine == EM_S390) { | |
6025 | DRI ("%r0", 0, DI); | |
6026 | DRI ("%r1", 1, DI); | |
6027 | DRI ("%r2", 2, DI); | |
6028 | DRI ("%r3", 3, DI); | |
6029 | DRI ("%r4", 4, DI); | |
6030 | DRI ("%r5", 5, DI); | |
6031 | DRI ("%r6", 6, DI); | |
6032 | DRI ("%r7", 7, DI); | |
6033 | DRI ("%r8", 8, DI); | |
6034 | DRI ("%r9", 9, DI); | |
6035 | DRI ("%r10", 10, DI); | |
6036 | DRI ("%r11", 11, DI); | |
6037 | DRI ("%r12", 12, DI); | |
6038 | DRI ("%r13", 13, DI); | |
6039 | DRI ("%r14", 14, DI); | |
6040 | DRI ("%r15", 15, DI); | |
6041 | } else if (elf_machine == EM_ARM) { | |
6042 | DRI ("r0", 0, SI); | |
6043 | DRI ("r1", 1, SI); | |
6044 | DRI ("r2", 2, SI); | |
6045 | DRI ("r3", 3, SI); | |
6046 | DRI ("r4", 4, SI); | |
6047 | DRI ("r5", 5, SI); | |
6048 | DRI ("r6", 6, SI); | |
6049 | DRI ("r7", 7, SI); | |
6050 | DRI ("r8", 8, SI); | |
6051 | DRI ("r9", 9, SI); | |
6052 | DRI ("r10", 10, SI); DRI ("sl", 10, SI); | |
6053 | DRI ("fp", 11, SI); | |
6054 | DRI ("ip", 12, SI); | |
6055 | DRI ("sp", 13, SI); | |
6056 | DRI ("lr", 14, SI); | |
6057 | DRI ("pc", 15, SI); | |
6058 | } else if (elf_machine == EM_AARCH64) { | |
6059 | DRI ("x0", 0, DI); DRI ("w0", 0, SI); | |
6060 | DRI ("x1", 1, DI); DRI ("w1", 1, SI); | |
6061 | DRI ("x2", 2, DI); DRI ("w2", 2, SI); | |
6062 | DRI ("x3", 3, DI); DRI ("w3", 3, SI); | |
6063 | DRI ("x4", 4, DI); DRI ("w4", 4, SI); | |
6064 | DRI ("x5", 5, DI); DRI ("w5", 5, SI); | |
6065 | DRI ("x6", 6, DI); DRI ("w6", 6, SI); | |
6066 | DRI ("x7", 7, DI); DRI ("w7", 7, SI); | |
6067 | DRI ("x8", 8, DI); DRI ("w8", 8, SI); | |
6068 | DRI ("x9", 9, DI); DRI ("w9", 9, SI); | |
6069 | DRI ("x10", 10, DI); DRI ("w10", 10, SI); | |
6070 | DRI ("x11", 11, DI); DRI ("w11", 11, SI); | |
6071 | DRI ("x12", 12, DI); DRI ("w12", 12, SI); | |
6072 | DRI ("x13", 13, DI); DRI ("w13", 13, SI); | |
6073 | DRI ("x14", 14, DI); DRI ("w14", 14, SI); | |
6074 | DRI ("x15", 15, DI); DRI ("w15", 15, SI); | |
6075 | DRI ("x16", 16, DI); DRI ("w16", 16, SI); | |
6076 | DRI ("x17", 17, DI); DRI ("w17", 17, SI); | |
6077 | DRI ("x18", 18, DI); DRI ("w18", 18, SI); | |
6078 | DRI ("x19", 19, DI); DRI ("w19", 19, SI); | |
6079 | DRI ("x20", 20, DI); DRI ("w20", 20, SI); | |
6080 | DRI ("x21", 21, DI); DRI ("w21", 21, SI); | |
6081 | DRI ("x22", 22, DI); DRI ("w22", 22, SI); | |
6082 | DRI ("x23", 23, DI); DRI ("w23", 23, SI); | |
6083 | DRI ("x24", 24, DI); DRI ("w24", 24, SI); | |
6084 | DRI ("x25", 25, DI); DRI ("w25", 25, SI); | |
6085 | DRI ("x26", 26, DI); DRI ("w26", 26, SI); | |
6086 | DRI ("x27", 27, DI); DRI ("w27", 27, SI); | |
6087 | DRI ("x28", 28, DI); DRI ("w28", 28, SI); | |
6088 | DRI ("x29", 29, DI); DRI ("w29", 29, SI); | |
6089 | DRI ("x30", 30, DI); DRI ("w30", 30, SI); | |
6090 | DRI ("sp", 31, DI); | |
6091 | } else if (arg_count) { | |
6092 | /* permit this case; just fall back to dwarf */ | |
6093 | } | |
6094 | #undef DRI | |
6095 | ||
6096 | // Build regex pieces out of the known dwarf_regs. We keep two separate | |
6097 | // lists: ones with the % prefix (and thus unambigiuous even despite PR11821), | |
6098 | // and ones with no prefix (and thus only usable in unambiguous contexts). | |
6099 | map<string,pair<unsigned,int> >::const_iterator ri; | |
6100 | for (ri = dwarf_regs.begin(); ri != dwarf_regs.end(); ri++) | |
6101 | { | |
6102 | string regname = ri->first; | |
6103 | assert (regname != ""); | |
6104 | regnames += string("|")+regname; | |
6105 | if (regname[0]=='%') | |
6106 | percent_regnames += string("|")+regname; | |
6107 | } | |
6108 | ||
6109 | // clip off leading | | |
6110 | if (regnames != "") | |
6111 | regnames = regnames.substr(1); | |
6112 | if (percent_regnames != "") | |
6113 | percent_regnames = percent_regnames.substr(1); | |
6114 | } | |
7a05f484 SC |
6115 | |
6116 | void | |
6ef331c8 | 6117 | sdt_uprobe_var_expanding_visitor::visit_target_symbol_context (target_symbol* e) |
7a05f484 | 6118 | { |
6ef331c8 | 6119 | if (e->addressof) |
dc09353a | 6120 | throw SEMANTIC_ERROR(_("cannot take address of context variable"), e->tok); |
6ef331c8 SC |
6121 | |
6122 | if (e->name == "$$name") | |
7a05f484 | 6123 | { |
6ef331c8 SC |
6124 | literal_string *myname = new literal_string (probe_name); |
6125 | myname->tok = e->tok; | |
6126 | provide(myname); | |
6127 | return; | |
6128 | } | |
7a05f484 | 6129 | |
6ef331c8 SC |
6130 | else if (e->name == "$$provider") |
6131 | { | |
6132 | literal_string *myname = new literal_string (provider_name); | |
6133 | myname->tok = e->tok; | |
6134 | provide(myname); | |
6135 | return; | |
6136 | } | |
a794dbeb | 6137 | |
6ef331c8 SC |
6138 | else if (e->name == "$$vars" || e->name == "$$parms") |
6139 | { | |
6140 | e->assert_no_components("sdt", true); | |
6ef331c8 SC |
6141 | |
6142 | // Convert $$vars to sprintf of a list of vars which we recursively evaluate | |
63ea4244 | 6143 | |
1c922ad7 | 6144 | print_format* pf = print_format::create(e->tok, "sprintf"); |
6ef331c8 SC |
6145 | |
6146 | for (unsigned i = 1; i <= arg_count; ++i) | |
6147 | { | |
6148 | if (i > 1) | |
6149 | pf->raw_components += " "; | |
6150 | target_symbol *tsym = new target_symbol; | |
6151 | tsym->tok = e->tok; | |
6152 | tsym->name = "$arg" + lex_cast(i); | |
6153 | pf->raw_components += tsym->name; | |
6154 | tsym->components = e->components; | |
6155 | ||
8c2f50c0 | 6156 | expression *texp = require<expression> (tsym); |
6ef331c8 SC |
6157 | if (!e->components.empty() && |
6158 | e->components[0].type == target_symbol::comp_pretty_print) | |
6159 | pf->raw_components += "=%s"; | |
6160 | else | |
6161 | pf->raw_components += "=%#x"; | |
6162 | pf->args.push_back(texp); | |
6163 | } | |
6164 | ||
6165 | pf->components = print_format::string_to_components(pf->raw_components); | |
6166 | provide (pf); | |
6167 | } | |
6168 | else | |
6169 | assert(0); // shouldn't get here | |
6170 | } | |
6171 | ||
03c45fcb JL |
6172 | unsigned |
6173 | sdt_uprobe_var_expanding_visitor::get_target_symbol_argno_and_validate (target_symbol *e) | |
6174 | { | |
6175 | // parsing | |
6176 | unsigned argno = 0; | |
6177 | if (startswith(e->name, "$arg")) | |
6178 | { | |
6179 | try | |
6180 | { | |
6181 | argno = lex_cast<unsigned>(e->name.substr(4)); | |
6182 | } | |
6183 | catch (const runtime_error& f) | |
6184 | { | |
6185 | // non-integral $arg suffix: e.g. $argKKKSDF | |
6186 | argno = 0; | |
6187 | } | |
6188 | } | |
6189 | ||
6190 | // validation | |
6191 | if (arg_count == 0 || // a sdt.h variant without .probe-stored arg_count | |
6192 | argno < 1 || argno > arg_count) // a $argN with out-of-range N | |
6193 | { | |
6194 | // NB: Either | |
6195 | // 1) uprobe1_type $argN or $FOO (we don't know the arg_count) | |
6196 | // 2) uprobe2_type $FOO (no probe args) | |
6197 | // both of which get resolved later. | |
6198 | // Throw it now, and it might be resolved by DWARF later. | |
6199 | need_debug_info = true; | |
6200 | throw SEMANTIC_ERROR(_("target-symbol requires debuginfo"), e->tok); | |
6201 | } | |
6202 | assert (arg_tokens.size() >= argno); | |
6203 | return argno; | |
6204 | } | |
6ef331c8 | 6205 | |
ac074daf JL |
6206 | long |
6207 | sdt_uprobe_var_expanding_visitor::parse_out_arg_precision(string& asmarg) | |
6208 | { | |
6209 | long precision; | |
6210 | if (asmarg.find('@') != string::npos) | |
6211 | { | |
6212 | precision = lex_cast<int>(asmarg.substr(0, asmarg.find('@'))); | |
6213 | asmarg = asmarg.substr(asmarg.find('@')+1); | |
6214 | } | |
6215 | else | |
6216 | { | |
6217 | // V1/V2 do not have precision field so default to signed long | |
6218 | // V3 asm does not have precision field so default to unsigned long | |
6219 | if (probe_type == uprobe3_type) | |
6220 | precision = sizeof(long); // this is an asm probe | |
6221 | else | |
6222 | precision = -sizeof(long); | |
6223 | } | |
6224 | return precision; | |
6225 | } | |
6226 | ||
0fbf6fb8 JL |
6227 | expression* |
6228 | sdt_uprobe_var_expanding_visitor::try_parse_arg_literal (target_symbol *e, | |
6229 | const string& asmarg, | |
6230 | long precision) | |
6231 | { | |
6232 | expression *argexpr = NULL; | |
6233 | ||
6234 | // Here, we test for a numeric literal. | |
6235 | // Only accept (signed) decimals throughout. XXX | |
6236 | ||
6237 | // PR11821. NB: on powerpc, literals are not prefixed with $, | |
6238 | // so this regex does not match. But that's OK, since without | |
6239 | // -mregnames, we can't tell them apart from register numbers | |
6240 | // anyway. With -mregnames, we could, if gcc somehow | |
6241 | // communicated to us the presence of that option, but alas it | |
6242 | // doesn't. http://gcc.gnu.org/PR44995. | |
6243 | vector<string> matches; | |
6244 | if (!regexp_match (asmarg, "^[i\\$#][-]?[0-9][0-9]*$", matches)) | |
6245 | { | |
6246 | string sn = matches[0].substr(1); | |
6247 | int64_t n; | |
6248 | ||
6249 | // We have to pay attention to the size & sign, as gcc sometimes | |
6250 | // propagates constants that don't quite match, like a negative | |
6251 | // value to fill an unsigned type. | |
6252 | // NB: let it throw if something happens | |
6253 | switch (precision) | |
6254 | { | |
6255 | case -1: n = lex_cast< int8_t>(sn); break; | |
6256 | case 1: n = lex_cast< uint8_t>(sn); break; | |
6257 | case -2: n = lex_cast< int16_t>(sn); break; | |
6258 | case 2: n = lex_cast<uint16_t>(sn); break; | |
6259 | case -4: n = lex_cast< int32_t>(sn); break; | |
6260 | case 4: n = lex_cast<uint32_t>(sn); break; | |
6261 | default: | |
6262 | case -8: n = lex_cast< int64_t>(sn); break; | |
6263 | case 8: n = lex_cast<uint64_t>(sn); break; | |
6264 | } | |
6265 | ||
6266 | literal_number* ln = new literal_number(n); | |
6267 | ln->tok = e->tok; | |
6268 | argexpr = ln; | |
6269 | } | |
6270 | ||
6271 | return argexpr; | |
6272 | } | |
6273 | ||
95b78bc9 JL |
6274 | expression* |
6275 | sdt_uprobe_var_expanding_visitor::try_parse_arg_register (target_symbol *e, | |
6276 | const string& asmarg, | |
6277 | long precision) | |
6278 | { | |
6279 | expression *argexpr = NULL; | |
6280 | ||
6281 | // test for REGISTER | |
6282 | // NB: Because PR11821, we must use percent_regnames here. | |
6283 | string regexp; | |
6284 | if (elf_machine == EM_PPC || elf_machine == EM_PPC64 || elf_machine == EM_ARM) | |
6285 | regexp = "^(" + regnames + ")$"; | |
6286 | else | |
6287 | regexp = "^(" + percent_regnames + ")$"; | |
6288 | ||
6289 | vector<string> matches; | |
6290 | if (!regexp_match(asmarg, regexp, matches)) | |
6291 | { | |
6292 | string regname = matches[1]; | |
6293 | map<string,pair<unsigned,int> >::iterator ri = dwarf_regs.find (regname); | |
6294 | if (ri != dwarf_regs.end()) // known register | |
6295 | { | |
6296 | embedded_expr *get_arg1 = new embedded_expr; | |
6297 | string width_adjust; | |
6298 | switch (ri->second.second) | |
6299 | { | |
6300 | case QI: width_adjust = ") & 0xff)"; break; | |
6301 | case QIh: width_adjust = ">>8) & 0xff)"; break; | |
6302 | case HI: | |
6303 | // preserve 16 bit register signness | |
6304 | width_adjust = ") & 0xffff)"; | |
6305 | if (precision < 0) | |
6306 | width_adjust += " << 48 >> 48"; | |
6307 | break; | |
6308 | case SI: | |
6309 | // preserve 32 bit register signness | |
6310 | width_adjust = ") & 0xffffffff)"; | |
6311 | if (precision < 0) | |
6312 | width_adjust += " << 32 >> 32"; | |
6313 | break; | |
6314 | default: width_adjust = "))"; | |
6315 | } | |
6316 | string type = ""; | |
6317 | if (probe_type == uprobe3_type) | |
6318 | type = (precision < 0 | |
6319 | ? "(int" : "(uint") + lex_cast(abs(precision) * 8) + "_t)"; | |
6320 | type = type + "(("; | |
6321 | get_arg1->tok = e->tok; | |
6322 | get_arg1->code = string("/* unprivileged */ /* pure */") | |
6323 | + string(" ((int64_t)") + type | |
a57b7534 | 6324 | + string("u_fetch_register(") |
95b78bc9 JL |
6325 | + lex_cast(dwarf_regs[regname].first) + string("))") |
6326 | + width_adjust; | |
6327 | argexpr = get_arg1; | |
6328 | } | |
6329 | } | |
6330 | return argexpr; | |
6331 | } | |
6332 | ||
b15f98b2 JL |
6333 | static string |
6334 | precision_to_function(long precision) | |
6335 | { | |
6336 | switch (precision) | |
6337 | { | |
6338 | case 1: case -1: | |
6339 | return "user_int8"; | |
6340 | case 2: | |
6341 | return "user_uint16"; | |
6342 | case -2: | |
6343 | return "user_int16"; | |
6344 | case 4: | |
6345 | return "user_uint32"; | |
6346 | case -4: | |
6347 | return "user_int32"; | |
6348 | case 8: case -8: | |
6349 | return "user_int64"; | |
6350 | default: | |
6351 | return "user_long"; | |
6352 | } | |
6353 | } | |
6354 | ||
8da56b62 JL |
6355 | expression* |
6356 | sdt_uprobe_var_expanding_visitor::try_parse_arg_offset_register (target_symbol *e, | |
6357 | const string& asmarg, | |
6358 | long precision) | |
6359 | { | |
6360 | expression *argexpr = NULL; | |
6361 | ||
6362 | // test for OFFSET(REGISTER) where OFFSET is +-N+-N+-N | |
6363 | // NB: Despite PR11821, we can use regnames here, since the parentheses | |
6364 | // make things unambiguous. (Note: gdb/stap-probe.c also parses this) | |
6365 | // On ARM test for [REGISTER, OFFSET] | |
6366 | ||
6367 | string regexp; | |
6368 | int reg, offset1; | |
6369 | if (elf_machine == EM_ARM) | |
6370 | { | |
6371 | regexp = "^\\[(" + regnames + ")(, #([+-]?[0-9]+)([+-][0-9]*)?([+-][0-9]*)?)?\\]$"; | |
6372 | reg = 1; | |
6373 | offset1 = 3; | |
6374 | } | |
6375 | else | |
6376 | { | |
6377 | regexp = "^([+-]?[0-9]*)([+-][0-9]*)?([+-][0-9]*)?[(](" + regnames + ")[)]$"; | |
6378 | reg = 4; | |
6379 | offset1 = 1; | |
6380 | } | |
6381 | ||
6382 | vector<string> matches; | |
6383 | if (!regexp_match(asmarg, regexp, matches)) | |
6384 | { | |
6385 | string regname; | |
6386 | int64_t disp = 0; | |
6387 | if (matches[reg].length()) | |
6388 | regname = matches[reg]; | |
6389 | if (dwarf_regs.find (regname) == dwarf_regs.end()) | |
6390 | throw SEMANTIC_ERROR(_F("unrecognized register '%s'", regname.c_str())); | |
6391 | ||
6392 | for (int i=offset1; i <= (offset1 + 2); i++) | |
6393 | if (matches[i].length()) | |
6394 | // should decode positive/negative hex/decimal | |
6395 | // NB: let it throw if something happens | |
6396 | disp += lex_cast<int64_t>(matches[i]); | |
6397 | ||
6398 | // synthesize user_long(%{fetch_register(R)%} + D) | |
6399 | embedded_expr *get_arg1 = new embedded_expr; | |
6400 | get_arg1->tok = e->tok; | |
6401 | get_arg1->code = string("/* unprivileged */ /* pure */") | |
a57b7534 | 6402 | + string("u_fetch_register(") |
8da56b62 JL |
6403 | + lex_cast(dwarf_regs[regname].first) + string(")"); |
6404 | // XXX: may we ever need to cast that to a narrower type? | |
6405 | ||
6406 | literal_number* inc = new literal_number(disp); | |
6407 | inc->tok = e->tok; | |
6408 | ||
6409 | binary_expression *be = new binary_expression; | |
6410 | be->tok = e->tok; | |
6411 | be->left = get_arg1; | |
6412 | be->op = "+"; | |
6413 | be->right = inc; | |
6414 | ||
6415 | functioncall *fc = new functioncall; | |
b15f98b2 | 6416 | fc->function = precision_to_function(precision); |
8da56b62 JL |
6417 | fc->tok = e->tok; |
6418 | fc->args.push_back(be); | |
6419 | ||
6420 | argexpr = fc; | |
6421 | } | |
6422 | ||
6423 | return argexpr; | |
6424 | } | |
6425 | ||
10fcca15 JL |
6426 | expression* |
6427 | sdt_uprobe_var_expanding_visitor::try_parse_arg_effective_addr (target_symbol *e, | |
6428 | const string& asmarg, | |
6429 | long precision) | |
6430 | { | |
6431 | expression *argexpr = NULL; | |
6432 | ||
6433 | // test for OFFSET(BASE_REGISTER,INDEX_REGISTER[,SCALE]) where OFFSET is +-N+-N+-N | |
6434 | // NB: Despite PR11821, we can use regnames here, since the parentheses | |
6435 | // make things unambiguous. (Note: gdb/stap-probe.c also parses this) | |
6436 | string regexp = "^([+-]?[0-9]*)([+-][0-9]*)?([+-][0-9]*)?[(](" + regnames + "),(" + | |
6437 | regnames + ")(,[1248])?[)]$"; | |
6438 | vector<string> matches; | |
6439 | if (!regexp_match(asmarg, regexp, matches)) | |
6440 | { | |
6441 | string baseregname; | |
6442 | string indexregname; | |
6443 | int64_t disp = 0; | |
6444 | short scale = 1; | |
6445 | ||
6446 | if (matches[6].length()) | |
6447 | // NB: let it throw if we can't cast | |
6448 | scale = lex_cast<short>(matches[6].substr(1)); // NB: skip the comma! | |
6449 | ||
6450 | if (matches[4].length()) | |
6451 | baseregname = matches[4]; | |
6452 | if (dwarf_regs.find (baseregname) == dwarf_regs.end()) | |
6453 | throw SEMANTIC_ERROR(_F("unrecognized base register '%s'", baseregname.c_str())); | |
6454 | ||
6455 | if (matches[5].length()) | |
6456 | indexregname = matches[5]; | |
6457 | if (dwarf_regs.find (indexregname) == dwarf_regs.end()) | |
6458 | throw SEMANTIC_ERROR(_F("unrecognized index register '%s'", indexregname.c_str())); | |
6459 | ||
6460 | for (int i = 1; i <= 3; i++) // up to three OFFSET terms | |
6461 | if (matches[i].length()) | |
6462 | // should decode positive/negative hex/decimal | |
6463 | // NB: let it throw if something happens | |
6464 | disp += lex_cast<int64_t>(matches[i]); | |
6465 | ||
6466 | // synthesize user_long(%{fetch_register(R1)+fetch_register(R2)*N%} + D) | |
6467 | ||
6468 | embedded_expr *get_arg1 = new embedded_expr; | |
a57b7534 | 6469 | string regfn = "u_fetch_register"; |
10fcca15 JL |
6470 | |
6471 | get_arg1->tok = e->tok; | |
6472 | get_arg1->code = string("/* unprivileged */ /* pure */") | |
6473 | + regfn + string("(")+lex_cast(dwarf_regs[baseregname].first)+string(")") | |
6474 | + string("+(") | |
6475 | + regfn + string("(")+lex_cast(dwarf_regs[indexregname].first)+string(")") | |
6476 | + string("*") | |
6477 | + lex_cast(scale) | |
6478 | + string(")"); | |
6479 | ||
6480 | // NB: could plop this +DISPLACEMENT bit into the embedded-c expression too | |
6481 | literal_number* inc = new literal_number(disp); | |
6482 | inc->tok = e->tok; | |
6483 | ||
6484 | binary_expression *be = new binary_expression; | |
6485 | be->tok = e->tok; | |
6486 | be->left = get_arg1; | |
6487 | be->op = "+"; | |
6488 | be->right = inc; | |
6489 | ||
6490 | functioncall *fc = new functioncall; | |
b15f98b2 | 6491 | fc->function = precision_to_function(precision); |
10fcca15 JL |
6492 | fc->tok = e->tok; |
6493 | fc->args.push_back(be); | |
6494 | ||
6495 | argexpr = fc; | |
6496 | } | |
6497 | ||
6498 | return argexpr; | |
6499 | } | |
6500 | ||
451c0c25 JL |
6501 | expression* |
6502 | sdt_uprobe_var_expanding_visitor::try_parse_arg_varname (target_symbol *e, | |
6503 | const string& asmarg, | |
6504 | long precision) | |
6ef331c8 | 6505 | { |
b8688ee6 | 6506 | static unsigned tick = 0; |
451c0c25 JL |
6507 | expression *argexpr = NULL; |
6508 | ||
6509 | // test for [OFF+]VARNAME[+OFF][(REGISTER)], where VARNAME is a variable | |
6510 | // name. NB: Despite PR11821, we can use regnames here, since the parentheses | |
6511 | // make things unambiguous. | |
6512 | string regex = "^(([0-9]+)[+])?([a-zA-Z_][a-zA-Z0-9_]*)([+][0-9]+)?([(](" | |
6513 | + regnames + ")[)])?$"; | |
6514 | vector<string> matches; | |
6515 | if (!regexp_match(asmarg, regex, matches)) | |
6516 | { | |
6517 | assert(matches.size() >= 4); | |
6518 | string varname = matches[3]; | |
6519 | ||
6520 | // OFF can be before VARNAME (put in matches[2]) or after (put in | |
6521 | // matches[4]) (or both?). Seems like in most cases it comes after, | |
6522 | // unless the code was compiled with -fPIC. | |
6523 | int64_t offset = 0; | |
6524 | if (!matches[2].empty()) | |
6525 | offset += lex_cast<int64_t>(matches[2]); | |
6526 | if (matches.size() >= 5 && !matches[4].empty()) | |
6527 | offset += lex_cast<int64_t>(matches[4]); | |
6528 | ||
6529 | string regname; | |
6530 | if (matches.size() >= 7) | |
6531 | regname = matches[6]; | |
6532 | ||
6533 | // If it's just VARNAME, then proceed. If it's VARNAME(REGISTER), then | |
6534 | // only proceed if it's RIP-relative addressing on x86_64. | |
6535 | if (regname.empty() || (regname == "%rip" && elf_machine == EM_X86_64)) | |
6536 | { | |
6537 | dw.mod_info->get_symtab(); | |
6538 | if (dw.mod_info->symtab_status != info_present) | |
6539 | throw SEMANTIC_ERROR(_("can't retrieve symbol table")); | |
6540 | ||
6541 | assert(dw.mod_info->sym_table); | |
6542 | map<string, Dwarf_Addr>& globals = dw.mod_info->sym_table->globals; | |
6543 | map<string, Dwarf_Addr>& locals = dw.mod_info->sym_table->locals; | |
6544 | Dwarf_Addr addr = 0; | |
6545 | ||
6546 | // check symtab locals then globals | |
6547 | if (locals.count(varname)) | |
6548 | addr = locals[varname]; | |
6549 | if (globals.count(varname)) | |
6550 | addr = globals[varname]; | |
6551 | ||
6552 | if (addr) | |
6553 | { | |
6554 | // add whatever offset is in the operand | |
6555 | addr += offset; | |
6556 | ||
6557 | // adjust for dw bias because relocate_address() expects a | |
6558 | // libdw address and this addr is from the symtab | |
6559 | dw.get_module_dwarf(false, false); | |
6560 | addr -= dw.module_bias; | |
6561 | ||
6562 | string reloc_section; | |
6563 | Dwarf_Addr reloc_addr = dw.relocate_address(addr, reloc_section); | |
6564 | ||
6565 | // OK, we have an address for the variable. Let's create a | |
6566 | // function that will just relocate it at runtime, and then | |
6567 | // call user_[u]int*() on the address it returns. | |
6568 | ||
6569 | functioncall *user_int_call = new functioncall; | |
b15f98b2 | 6570 | user_int_call->function = precision_to_function(precision); |
451c0c25 JL |
6571 | user_int_call->tok = e->tok; |
6572 | ||
6573 | functiondecl *get_addr_decl = new functiondecl; | |
6574 | get_addr_decl->tok = e->tok; | |
6575 | get_addr_decl->synthetic = true; | |
6576 | get_addr_decl->name = "_sdt_arg_get_addr_" + lex_cast(tick++); | |
6577 | get_addr_decl->type = pe_long; | |
6578 | ||
6bc53f02 | 6579 | // build _stp_umodule_relocate(module, addr, current) |
451c0c25 JL |
6580 | stringstream ss; |
6581 | ss << " /* unprivileged */ /* pure */ /* pragma:vma */" << endl; | |
a57b7534 JL |
6582 | ss << "STAP_RETURN(_stp_umodule_relocate("; |
6583 | ss << "\"" << path_remove_sysroot(session, process_name) << "\", "; | |
6584 | ss << "0x" << hex << reloc_addr << dec << ", "; | |
6585 | ss << "current"; | |
6586 | ss << "));" << endl; | |
451c0c25 JL |
6587 | |
6588 | embeddedcode *ec = new embeddedcode; | |
6589 | ec->tok = e->tok; | |
6590 | ec->code = ss.str(); | |
6591 | get_addr_decl->body = ec; | |
6592 | get_addr_decl->join(session); | |
6593 | ||
6594 | functioncall *get_addr_call = new functioncall; | |
6595 | get_addr_call->tok = e->tok; | |
6596 | get_addr_call->function = get_addr_decl->name; | |
6597 | user_int_call->args.push_back(get_addr_call); | |
b8688ee6 | 6598 | |
451c0c25 JL |
6599 | argexpr = user_int_call; |
6600 | } | |
6601 | } | |
6602 | } | |
6603 | ||
6604 | return argexpr; | |
6605 | } | |
6606 | ||
6607 | void | |
6608 | sdt_uprobe_var_expanding_visitor::visit_target_symbol_arg (target_symbol *e) | |
6609 | { | |
6ef331c8 SC |
6610 | try |
6611 | { | |
03c45fcb | 6612 | unsigned argno = get_target_symbol_argno_and_validate(e); // the N in $argN |
8aabf152 | 6613 | string asmarg = arg_tokens[argno-1]; // $arg1 => arg_tokens[0] |
c57ea854 | 6614 | |
8aabf152 FCE |
6615 | // Now we try to parse this thing, which is an assembler operand |
6616 | // expression. If we can't, we warn, back down to need_debug_info | |
b874bd52 | 6617 | // and hope for the best. Here is the syntax for a few architectures. |
9859b766 | 6618 | // Note that the power iN syntax is only for V3 sdt.h; gcc emits the i. |
8095a157 | 6619 | // |
b6aaaf21 JL |
6620 | // literal reg reg reg+ base+index*size+ VAR VAR+off RIP-relative |
6621 | // indirect offset offset VAR+off | |
6622 | // x86 $N %rR (%rR) N(%rR) O(%bR,%iR,S) var var+off var+off(%rip) | |
6623 | // x86_64 $N %rR (%rR) N(%rR) O(%bR,%iR,S) var var+off var+off(%rip) | |
6624 | // power iN R (R) N(R) | |
6625 | // ia64 N rR [r16] | |
6626 | // s390 N %rR 0(rR) N(r15) | |
6627 | // arm #N rR [rR] [rR, #N] | |
b874bd52 | 6628 | |
8aabf152 FCE |
6629 | expression* argexpr = 0; // filled in in case of successful parse |
6630 | ||
ac074daf JL |
6631 | // Parse (and remove from asmarg) the leading length |
6632 | long precision = parse_out_arg_precision(asmarg); | |
40fe32e0 | 6633 | |
0fbf6fb8 | 6634 | try |
8aabf152 | 6635 | { |
0fbf6fb8 JL |
6636 | if ((argexpr = try_parse_arg_literal(e, asmarg, precision)) != NULL) |
6637 | goto matched; | |
2e6d617a JL |
6638 | |
6639 | // all other matches require registers | |
6640 | if (regnames == "") | |
6641 | throw SEMANTIC_ERROR("no registers to use for parsing"); | |
95b78bc9 JL |
6642 | |
6643 | if ((argexpr = try_parse_arg_register(e, asmarg, precision)) != NULL) | |
6644 | goto matched; | |
8da56b62 JL |
6645 | if ((argexpr = try_parse_arg_offset_register(e, asmarg, precision)) != NULL) |
6646 | goto matched; | |
10fcca15 JL |
6647 | if ((argexpr = try_parse_arg_effective_addr(e, asmarg, precision)) != NULL) |
6648 | goto matched; | |
451c0c25 JL |
6649 | if ((argexpr = try_parse_arg_varname(e, asmarg, precision)) != NULL) |
6650 | goto matched; | |
0fbf6fb8 JL |
6651 | } |
6652 | catch (const semantic_error& err) | |
6653 | { | |
6654 | e->chain(err); | |
b8688ee6 | 6655 | } |
8aabf152 | 6656 | |
8aabf152 FCE |
6657 | // The asmarg operand was not recognized. Back down to dwarf. |
6658 | if (! session.suppress_warnings) | |
84fef8ee FCE |
6659 | { |
6660 | if (probe_type == UPROBE3_TYPE) | |
451c0c25 JL |
6661 | session.print_warning (_F("Can't parse SDT_V3 operand '%s' " |
6662 | "[man error::sdt]", asmarg.c_str()), | |
6663 | e->tok); | |
84fef8ee | 6664 | else // must be *PROBE2; others don't get asm operands |
451c0c25 JL |
6665 | session.print_warning (_F("Downgrading SDT_V2 probe argument to " |
6666 | "dwarf, can't parse '%s' [man error::sdt]", | |
6667 | asmarg.c_str()), | |
6668 | e->tok); | |
84fef8ee | 6669 | } |
451c0c25 | 6670 | |
8aabf152 | 6671 | need_debug_info = true; |
451c0c25 JL |
6672 | throw SEMANTIC_ERROR(_("SDT asm not understood, requires debuginfo " |
6673 | "[man error::sdt]"), e->tok); | |
6674 | ||
6675 | /* NOTREACHED */ | |
366af4e7 | 6676 | |
8aabf152 FCE |
6677 | matched: |
6678 | assert (argexpr != 0); | |
366af4e7 RM |
6679 | |
6680 | if (session.verbose > 2) | |
1e41115c | 6681 | //TRANSLATORS: We're mapping the operand to a new expression*. |
b530b5b3 | 6682 | clog << _F("mapped asm operand %s to ", asmarg.c_str()) << *argexpr << endl; |
366af4e7 | 6683 | |
aff5d390 | 6684 | if (e->components.empty()) // We have a scalar |
8aabf152 FCE |
6685 | { |
6686 | if (e->addressof) | |
dc09353a | 6687 | throw SEMANTIC_ERROR(_("cannot take address of sdt variable"), e->tok); |
8aabf152 | 6688 | provide (argexpr); |
8aabf152 FCE |
6689 | } |
6690 | else // $var->foo | |
6691 | { | |
6692 | cast_op *cast = new cast_op; | |
6693 | cast->name = "@cast"; | |
6694 | cast->tok = e->tok; | |
6695 | cast->operand = argexpr; | |
6696 | cast->components = e->components; | |
6697 | cast->type_name = probe_name + "_arg" + lex_cast(argno); | |
6698 | cast->module = process_name; | |
6699 | cast->visit(this); | |
8aabf152 | 6700 | } |
aff5d390 SC |
6701 | } |
6702 | catch (const semantic_error &er) | |
6703 | { | |
6704 | e->chain (er); | |
6705 | provide (e); | |
6706 | } | |
6707 | } | |
6708 | ||
6709 | ||
6ef331c8 SC |
6710 | void |
6711 | sdt_uprobe_var_expanding_visitor::visit_target_symbol (target_symbol* e) | |
6712 | { | |
6713 | try | |
6714 | { | |
49131a6d | 6715 | assert(e->name.size() > 0 |
bd1fcbad | 6716 | && (e->name[0] == '$' || e->name == "@var")); |
6ef331c8 SC |
6717 | |
6718 | if (e->name == "$$name" || e->name == "$$provider" || e->name == "$$parms" || e->name == "$$vars") | |
6719 | visit_target_symbol_context (e); | |
6720 | else | |
6721 | visit_target_symbol_arg (e); | |
6722 | } | |
6723 | catch (const semantic_error &er) | |
6724 | { | |
6725 | e->chain (er); | |
6726 | provide (e); | |
6727 | } | |
6728 | } | |
6729 | ||
6730 | ||
bd1fcbad YZ |
6731 | void |
6732 | sdt_uprobe_var_expanding_visitor::visit_atvar_op (atvar_op* e) | |
6733 | { | |
6734 | need_debug_info = true; | |
6735 | ||
6736 | // Fill in our current module context if needed | |
6737 | if (e->module.empty()) | |
6738 | e->module = process_name; | |
6739 | ||
6740 | var_expanding_visitor::visit_atvar_op(e); | |
6741 | } | |
6742 | ||
6743 | ||
40a0c64e JS |
6744 | void |
6745 | sdt_uprobe_var_expanding_visitor::visit_cast_op (cast_op* e) | |
6746 | { | |
6747 | // Fill in our current module context if needed | |
6748 | if (e->module.empty()) | |
6749 | e->module = process_name; | |
6750 | ||
6751 | var_expanding_visitor::visit_cast_op(e); | |
6752 | } | |
6753 | ||
6754 | ||
576eaefe SC |
6755 | void |
6756 | plt_expanding_visitor::visit_target_symbol (target_symbol *e) | |
6757 | { | |
6758 | try | |
6759 | { | |
6760 | if (e->name == "$$name") | |
6761 | { | |
6762 | literal_string *myname = new literal_string (entry); | |
6763 | myname->tok = e->tok; | |
6764 | provide(myname); | |
6765 | return; | |
6766 | } | |
3d69c03f JS |
6767 | |
6768 | // variable not found -> throw a semantic error | |
6769 | // (only to be caught right away, but this may be more complex later...) | |
6770 | string alternatives = "$$name"; | |
dc09353a | 6771 | throw SEMANTIC_ERROR(_F("unable to find plt variable '%s' (alternatives: %s)", |
3d69c03f | 6772 | e->name.c_str(), alternatives.c_str()), e->tok); |
576eaefe SC |
6773 | } |
6774 | catch (const semantic_error &er) | |
6775 | { | |
6776 | e->chain (er); | |
6777 | provide (e); | |
6778 | } | |
6779 | } | |
6780 | ||
6781 | ||
edce5b67 JS |
6782 | struct sdt_query : public base_query |
6783 | { | |
6784 | sdt_query(probe * base_probe, probe_point * base_loc, | |
6785 | dwflpp & dw, literal_map_t const & params, | |
51d6bda3 | 6786 | vector<derived_probe *> & results, const string user_lib); |
edce5b67 | 6787 | |
51d6bda3 | 6788 | void query_library (const char *data); |
614f0fcf JL |
6789 | set<string> visited_libraries; |
6790 | bool resolved_library; | |
6791 | ||
576eaefe | 6792 | void query_plt (const char *entry, size_t addr) {} |
edce5b67 JS |
6793 | void handle_query_module(); |
6794 | ||
6795 | private: | |
15284963 | 6796 | stap_sdt_probe_type probe_type; |
d61ea602 | 6797 | enum { probe_section=0, note_section=1, unknown_section=-1 } probe_loc; |
edce5b67 JS |
6798 | probe * base_probe; |
6799 | probe_point * base_loc; | |
6846cfc8 | 6800 | literal_map_t const & params; |
edce5b67 | 6801 | vector<derived_probe *> & results; |
a794dbeb FCE |
6802 | string pp_mark; |
6803 | string pp_provider; | |
51d6bda3 | 6804 | string user_lib; |
edce5b67 JS |
6805 | |
6806 | set<string> probes_handled; | |
6807 | ||
6808 | Elf_Data *pdata; | |
6809 | size_t probe_scn_offset; | |
6810 | size_t probe_scn_addr; | |
aff5d390 | 6811 | uint64_t arg_count; |
40fe32e0 | 6812 | GElf_Addr base; |
c57ea854 | 6813 | GElf_Addr pc; |
aff5d390 | 6814 | string arg_string; |
edce5b67 | 6815 | string probe_name; |
a794dbeb | 6816 | string provider_name; |
909ab234 | 6817 | GElf_Addr semaphore_load_offset; |
79a0ca08 | 6818 | Dwarf_Addr semaphore; |
edce5b67 JS |
6819 | |
6820 | bool init_probe_scn(); | |
6b51ee12 | 6821 | bool get_next_probe(); |
c57ea854 SC |
6822 | void iterate_over_probe_entries(); |
6823 | void handle_probe_entry(); | |
edce5b67 | 6824 | |
488d3c1b | 6825 | static void setup_note_probe_entry_callback (sdt_query *me, |
dbd24034 JL |
6826 | const string& scn_name, |
6827 | const string& note_name, | |
488d3c1b JL |
6828 | int type, |
6829 | const char *data, | |
6830 | size_t len); | |
dbd24034 JL |
6831 | void setup_note_probe_entry (const string& scn_name, |
6832 | const string& note_name, int type, | |
6833 | const char *data, size_t len); | |
40fe32e0 | 6834 | |
edce5b67 | 6835 | void convert_probe(probe *base); |
4ddb6dd0 | 6836 | void record_semaphore(vector<derived_probe *> & results, unsigned start); |
c72aa911 | 6837 | probe* convert_location(); |
40fe32e0 | 6838 | bool have_uprobe() {return probe_type == uprobe1_type || probe_type == uprobe2_type || probe_type == uprobe3_type;} |
c57ea854 SC |
6839 | bool have_debuginfo_uprobe(bool need_debug_info) |
6840 | {return probe_type == uprobe1_type | |
40fe32e0 | 6841 | || ((probe_type == uprobe2_type || probe_type == uprobe3_type) |
c57ea854 | 6842 | && need_debug_info);} |
40fe32e0 | 6843 | bool have_debuginfoless_uprobe() {return probe_type == uprobe2_type || probe_type == uprobe3_type;} |
edce5b67 JS |
6844 | }; |
6845 | ||
6846 | ||
6847 | sdt_query::sdt_query(probe * base_probe, probe_point * base_loc, | |
6848 | dwflpp & dw, literal_map_t const & params, | |
51d6bda3 | 6849 | vector<derived_probe *> & results, const string user_lib): |
614f0fcf JL |
6850 | base_query(dw, params), resolved_library(false), |
6851 | probe_type(unknown_probe_type), probe_loc(unknown_section), | |
6852 | base_probe(base_probe), base_loc(base_loc), params(params), results(results), | |
6853 | user_lib(user_lib), probe_scn_offset(0), probe_scn_addr(0), arg_count(0), | |
6854 | base(0), pc(0), semaphore_load_offset(0), semaphore(0) | |
edce5b67 | 6855 | { |
a794dbeb FCE |
6856 | assert(get_string_param(params, TOK_MARK, pp_mark)); |
6857 | get_string_param(params, TOK_PROVIDER, pp_provider); // pp_provider == "" -> unspecified | |
6858 | ||
ef428667 FCE |
6859 | // PR10245: permit usage of dtrace-y "-" separator in marker name; |
6860 | // map it to double-underscores. | |
6861 | size_t pos = 0; | |
6862 | while (1) // there may be more than one | |
6863 | { | |
a794dbeb | 6864 | size_t i = pp_mark.find("-", pos); |
ef428667 | 6865 | if (i == string::npos) break; |
a794dbeb | 6866 | pp_mark.replace (i, 1, "__"); |
ef428667 FCE |
6867 | pos = i+1; // resume searching after the inserted __ |
6868 | } | |
a794dbeb FCE |
6869 | |
6870 | // XXX: same for pp_provider? | |
edce5b67 JS |
6871 | } |
6872 | ||
6873 | ||
6874 | void | |
c57ea854 | 6875 | sdt_query::handle_probe_entry() |
edce5b67 | 6876 | { |
c57ea854 SC |
6877 | if (! have_uprobe() |
6878 | && !probes_handled.insert(probe_name).second) | |
edce5b67 JS |
6879 | return; |
6880 | ||
6881 | if (sess.verbose > 3) | |
c57ea854 | 6882 | { |
b78a0fbb | 6883 | //TRANSLATORS: Describing what probe type (kprobe or uprobe) the probe |
b530b5b3 LB |
6884 | //TRANSLATORS: is matched to. |
6885 | clog << _F("matched probe_name %s probe type ", probe_name.c_str()); | |
c57ea854 SC |
6886 | switch (probe_type) |
6887 | { | |
6888 | case uprobe1_type: | |
6889 | clog << "uprobe1 at 0x" << hex << pc << dec << endl; | |
6890 | break; | |
6891 | case uprobe2_type: | |
6892 | clog << "uprobe2 at 0x" << hex << pc << dec << endl; | |
6893 | break; | |
40fe32e0 SC |
6894 | case uprobe3_type: |
6895 | clog << "uprobe3 at 0x" << hex << pc << dec << endl; | |
6896 | break; | |
d61ea602 JS |
6897 | default: |
6898 | clog << "unknown!" << endl; | |
6899 | break; | |
c57ea854 SC |
6900 | } |
6901 | } | |
edce5b67 | 6902 | |
c57ea854 SC |
6903 | // Extend the derivation chain |
6904 | probe *new_base = convert_location(); | |
6905 | probe_point *new_location = new_base->locations[0]; | |
6906 | ||
c57ea854 SC |
6907 | bool need_debug_info = false; |
6908 | ||
7d395255 JS |
6909 | // We could get the Elf* from either dwarf_getelf(dwfl_module_getdwarf(...)) |
6910 | // or dwfl_module_getelf(...). We only need it for the machine type, which | |
6911 | // should be the same. The bias is used for relocating debuginfoless probes, | |
6912 | // though, so that must come from the possibly-prelinked ELF file, not DWARF. | |
c57ea854 | 6913 | Dwarf_Addr bias; |
7d395255 | 6914 | Elf* elf = dwfl_module_getelf (dw.mod_info->mod, &bias); |
c57ea854 | 6915 | |
1cc41cd6 DS |
6916 | /* Figure out the architecture of this particular ELF file. The |
6917 | dwarfless register-name mappings depend on it. */ | |
6918 | GElf_Ehdr ehdr_mem; | |
6919 | GElf_Ehdr* em = gelf_getehdr (elf, &ehdr_mem); | |
e1c3b13a | 6920 | if (em == 0) { DWFL_ASSERT ("dwfl_getehdr", dwfl_errno()); } |
d8f31d0a | 6921 | assert(em); |
1cc41cd6 | 6922 | int elf_machine = em->e_machine; |
b8688ee6 JL |
6923 | sdt_uprobe_var_expanding_visitor svv (sess, dw, elf_machine, module_val, |
6924 | provider_name, probe_name, probe_type, | |
6925 | arg_string, arg_count); | |
1cc41cd6 DS |
6926 | svv.replace (new_base->body); |
6927 | need_debug_info = svv.need_debug_info; | |
c57ea854 | 6928 | |
1cc41cd6 DS |
6929 | // XXX: why not derive_probes() in the uprobes case too? |
6930 | literal_map_t params; | |
6931 | for (unsigned i = 0; i < new_location->components.size(); ++i) | |
6932 | { | |
6933 | probe_point::component *c = new_location->components[i]; | |
6934 | params[c->functor] = c->arg; | |
6935 | } | |
c57ea854 | 6936 | |
73d53dd2 | 6937 | unsigned prior_results_size = results.size(); |
1cc41cd6 DS |
6938 | dwarf_query q(new_base, new_location, dw, params, results, "", ""); |
6939 | q.has_mark = true; // enables mid-statement probing | |
30263a73 | 6940 | |
73d53dd2 JS |
6941 | // V1 probes always need dwarf info |
6942 | // V2+ probes need dwarf info in case of a variable reference | |
1cc41cd6 | 6943 | if (have_debuginfo_uprobe(need_debug_info)) |
06de3a04 | 6944 | dw.iterate_over_modules<base_query>(&query_module, &q); |
73d53dd2 JS |
6945 | |
6946 | // For V2+ probes, if variable references weren't used or failed (PR14369), | |
6947 | // then try with the more direct approach. Unresolved $vars might still | |
6948 | // cause their own error, but this gives them a chance to be optimized out. | |
6949 | if (have_debuginfoless_uprobe() && results.size() == prior_results_size) | |
1cc41cd6 DS |
6950 | { |
6951 | string section; | |
6952 | Dwarf_Addr reloc_addr = q.statement_num_val + bias; | |
6953 | if (dwfl_module_relocations (q.dw.mod_info->mod) > 0) | |
6954 | { | |
6955 | dwfl_module_relocate_address (q.dw.mod_info->mod, &reloc_addr); | |
6956 | section = ".dynamic"; | |
6957 | } | |
6958 | else | |
6959 | section = ".absolute"; | |
edce5b67 | 6960 | |
1cc41cd6 DS |
6961 | uprobe_derived_probe* p = |
6962 | new uprobe_derived_probe ("", "", 0, | |
6963 | path_remove_sysroot(sess,q.module_val), | |
6964 | section, | |
6965 | q.statement_num_val, reloc_addr, q, 0); | |
6966 | p->saveargs (arg_count); | |
6967 | results.push_back (p); | |
c57ea854 | 6968 | } |
487bf4e2 | 6969 | sess.unwindsym_modules.insert (dw.module_name); |
73d53dd2 | 6970 | record_semaphore(results, prior_results_size); |
c57ea854 | 6971 | } |
edce5b67 | 6972 | |
4ddb6dd0 | 6973 | |
c57ea854 SC |
6974 | void |
6975 | sdt_query::handle_query_module() | |
6976 | { | |
6977 | if (!init_probe_scn()) | |
6978 | return; | |
edce5b67 | 6979 | |
c57ea854 SC |
6980 | if (sess.verbose > 3) |
6981 | clog << "TOK_MARK: " << pp_mark << " TOK_PROVIDER: " << pp_provider << endl; | |
edce5b67 | 6982 | |
40fe32e0 SC |
6983 | if (probe_loc == note_section) |
6984 | { | |
6985 | GElf_Shdr shdr_mem; | |
6986 | GElf_Shdr *shdr = dw.get_section (".stapsdt.base", &shdr_mem); | |
6987 | ||
909ab234 JS |
6988 | // The 'base' lets us adjust the hardcoded addresses in notes for prelink |
6989 | // effects. The 'semaphore_load_offset' accounts for the difference in | |
6990 | // load addresses between text and data, so the semaphore can be | |
6991 | // converted to a file offset if needed. | |
40fe32e0 | 6992 | if (shdr) |
909ab234 JS |
6993 | { |
6994 | base = shdr->sh_addr; | |
6995 | GElf_Addr base_offset = shdr->sh_offset; | |
6996 | shdr = dw.get_section (".probes", &shdr_mem); | |
6997 | if (shdr) | |
6998 | semaphore_load_offset = | |
6999 | (shdr->sh_addr - shdr->sh_offset) - (base - base_offset); | |
7000 | } | |
40fe32e0 | 7001 | else |
909ab234 JS |
7002 | base = semaphore_load_offset = 0; |
7003 | ||
488d3c1b | 7004 | dw.iterate_over_notes (this, &sdt_query::setup_note_probe_entry_callback); |
40fe32e0 | 7005 | } |
d61ea602 | 7006 | else if (probe_loc == probe_section) |
40fe32e0 | 7007 | iterate_over_probe_entries (); |
edce5b67 JS |
7008 | } |
7009 | ||
7010 | ||
7011 | bool | |
7012 | sdt_query::init_probe_scn() | |
7013 | { | |
448a86b7 | 7014 | Elf* elf; |
edce5b67 | 7015 | GElf_Shdr shdr_mem; |
40fe32e0 SC |
7016 | |
7017 | GElf_Shdr *shdr = dw.get_section (".note.stapsdt", &shdr_mem); | |
7018 | if (shdr) | |
7019 | { | |
7020 | probe_loc = note_section; | |
7021 | return true; | |
7022 | } | |
edce5b67 | 7023 | |
448a86b7 | 7024 | shdr = dw.get_section (".probes", &shdr_mem, &elf); |
fea74777 | 7025 | if (shdr) |
edce5b67 | 7026 | { |
fea74777 SC |
7027 | pdata = elf_getdata_rawchunk (elf, shdr->sh_offset, shdr->sh_size, ELF_T_BYTE); |
7028 | probe_scn_offset = 0; | |
7029 | probe_scn_addr = shdr->sh_addr; | |
7030 | assert (pdata != NULL); | |
7031 | if (sess.verbose > 4) | |
ce0f6648 LB |
7032 | clog << "got .probes elf scn_addr@0x" << probe_scn_addr << ", size: " |
7033 | << pdata->d_size << endl; | |
40fe32e0 | 7034 | probe_loc = probe_section; |
fea74777 | 7035 | return true; |
edce5b67 | 7036 | } |
fea74777 | 7037 | else |
edce5b67 | 7038 | return false; |
edce5b67 JS |
7039 | } |
7040 | ||
40fe32e0 | 7041 | void |
dbd24034 JL |
7042 | sdt_query::setup_note_probe_entry_callback (sdt_query *me, |
7043 | const string& scn_name, | |
7044 | const string& note_name, int type, | |
7045 | const char *data, size_t len) | |
40fe32e0 | 7046 | { |
dbd24034 | 7047 | me->setup_note_probe_entry (scn_name, note_name, type, data, len); |
40fe32e0 SC |
7048 | } |
7049 | ||
7050 | ||
7051 | void | |
dbd24034 JL |
7052 | sdt_query::setup_note_probe_entry (const string& scn_name, |
7053 | const string& note_name, int type, | |
7054 | const char *data, size_t len) | |
40fe32e0 | 7055 | { |
dbd24034 JL |
7056 | if (scn_name.compare(".note.stapsdt")) |
7057 | return; | |
7058 | #define _SDT_NOTE_NAME "stapsdt" | |
7059 | if (note_name.compare(_SDT_NOTE_NAME)) | |
7060 | return; | |
40fe32e0 SC |
7061 | #define _SDT_NOTE_TYPE 3 |
7062 | if (type != _SDT_NOTE_TYPE) | |
7063 | return; | |
7064 | ||
dbd24034 | 7065 | // we found a probe entry |
40fe32e0 SC |
7066 | union |
7067 | { | |
7068 | Elf64_Addr a64[3]; | |
7069 | Elf32_Addr a32[3]; | |
7070 | } buf; | |
7071 | Dwarf_Addr bias; | |
7072 | Elf* elf = (dwfl_module_getelf (dw.mod_info->mod, &bias)); | |
7073 | Elf_Data dst = | |
7074 | { | |
7075 | &buf, ELF_T_ADDR, EV_CURRENT, | |
7076 | gelf_fsize (elf, ELF_T_ADDR, 3, EV_CURRENT), 0, 0 | |
7077 | }; | |
7078 | assert (dst.d_size <= sizeof buf); | |
7079 | ||
7080 | if (len < dst.d_size + 3) | |
7081 | return; | |
7082 | ||
7083 | Elf_Data src = | |
7084 | { | |
7085 | (void *) data, ELF_T_ADDR, EV_CURRENT, | |
7086 | dst.d_size, 0, 0 | |
7087 | }; | |
7088 | ||
7089 | if (gelf_xlatetom (elf, &dst, &src, | |
7090 | elf_getident (elf, NULL)[EI_DATA]) == NULL) | |
7091 | printf ("gelf_xlatetom: %s", elf_errmsg (-1)); | |
7092 | ||
7093 | probe_type = uprobe3_type; | |
7094 | const char * provider = data + dst.d_size; | |
3f803f9e | 7095 | |
40fe32e0 | 7096 | const char *name = (const char*)memchr (provider, '\0', data + len - provider); |
3f803f9e CM |
7097 | if(name++ == NULL) |
7098 | return; | |
7099 | ||
7100 | const char *args = (const char*)memchr (name, '\0', data + len - name); | |
7101 | if (args++ == NULL || memchr (args, '\0', data + len - name) != data + len - 1) | |
7102 | return; | |
7103 | ||
7104 | provider_name = provider; | |
7105 | probe_name = name; | |
7106 | arg_string = args; | |
40fe32e0 | 7107 | |
e90006d7 JL |
7108 | dw.mod_info->marks.insert(make_pair(provider, name)); |
7109 | ||
40fe32e0 SC |
7110 | // Did we find a matching probe? |
7111 | if (! (dw.function_name_matches_pattern (probe_name, pp_mark) | |
7112 | && ((pp_provider == "") | |
7113 | || dw.function_name_matches_pattern (provider_name, pp_provider)))) | |
7114 | return; | |
7115 | ||
e9a90eee JS |
7116 | // PR13934: Assembly probes are not forced to use the N@OP form. |
7117 | // If we have '@' then great, else count based on space-delimiters. | |
7118 | arg_count = count(arg_string.begin(), arg_string.end(), '@'); | |
7119 | if (!arg_count && !arg_string.empty()) | |
7120 | arg_count = 1 + count(arg_string.begin(), arg_string.end(), ' '); | |
7121 | ||
40fe32e0 SC |
7122 | GElf_Addr base_ref; |
7123 | if (gelf_getclass (elf) == ELFCLASS32) | |
7124 | { | |
7125 | pc = buf.a32[0]; | |
7126 | base_ref = buf.a32[1]; | |
7127 | semaphore = buf.a32[2]; | |
7128 | } | |
7129 | else | |
7130 | { | |
7131 | pc = buf.a64[0]; | |
7132 | base_ref = buf.a64[1]; | |
7133 | semaphore = buf.a64[2]; | |
7134 | } | |
7135 | ||
7136 | semaphore += base - base_ref; | |
7137 | pc += base - base_ref; | |
7138 | ||
7d395255 JS |
7139 | // The semaphore also needs the ELF bias added now, so |
7140 | // record_semaphore can properly relocate it later. | |
7141 | semaphore += bias; | |
7142 | ||
40fe32e0 | 7143 | if (sess.verbose > 4) |
b530b5b3 | 7144 | clog << _F(" saw .note.stapsdt %s%s ", probe_name.c_str(), (provider_name != "" ? _(" (provider ")+provider_name+") " : "").c_str()) << "@0x" << hex << pc << dec << endl; |
40fe32e0 SC |
7145 | |
7146 | handle_probe_entry(); | |
7147 | } | |
7148 | ||
7149 | ||
c57ea854 SC |
7150 | void |
7151 | sdt_query::iterate_over_probe_entries() | |
edce5b67 | 7152 | { |
c57ea854 | 7153 | // probes are in the .probe section |
edce5b67 JS |
7154 | while (probe_scn_offset < pdata->d_size) |
7155 | { | |
aff5d390 SC |
7156 | stap_sdt_probe_entry_v1 *pbe_v1 = (stap_sdt_probe_entry_v1 *) ((char*)pdata->d_buf + probe_scn_offset); |
7157 | stap_sdt_probe_entry_v2 *pbe_v2 = (stap_sdt_probe_entry_v2 *) ((char*)pdata->d_buf + probe_scn_offset); | |
15284963 | 7158 | probe_type = (stap_sdt_probe_type)(pbe_v1->type_a); |
1cc41cd6 | 7159 | if (! have_uprobe()) |
edce5b67 JS |
7160 | { |
7161 | // Unless this is a mangled .probes section, this happens | |
7162 | // because the name of the probe comes first, followed by | |
7163 | // the sentinel. | |
7164 | if (sess.verbose > 5) | |
b530b5b3 | 7165 | clog << _F("got unknown probe_type : 0x%x", probe_type) << endl; |
edce5b67 JS |
7166 | probe_scn_offset += sizeof(__uint32_t); |
7167 | continue; | |
7168 | } | |
aff5d390 SC |
7169 | if ((long)pbe_v1 % sizeof(__uint64_t)) // we have stap_sdt_probe_entry_v1.type_b |
7170 | { | |
7171 | pbe_v1 = (stap_sdt_probe_entry_v1*)((char*)pbe_v1 - sizeof(__uint32_t)); | |
1cc41cd6 | 7172 | if (pbe_v1->type_b != uprobe1_type) |
aff5d390 SC |
7173 | continue; |
7174 | } | |
7175 | ||
1cc41cd6 | 7176 | if (probe_type == uprobe1_type) |
aff5d390 | 7177 | { |
79a0ca08 | 7178 | if (pbe_v1->name == 0) // No name possibly means we have a .so with a relocation |
c57ea854 | 7179 | return; |
79a0ca08 | 7180 | semaphore = 0; |
aff5d390 | 7181 | probe_name = (char*)((char*)pdata->d_buf + pbe_v1->name - (char*)probe_scn_addr); |
a794dbeb | 7182 | provider_name = ""; // unknown |
1cc41cd6 DS |
7183 | pc = pbe_v1->arg; |
7184 | arg_count = 0; | |
aff5d390 SC |
7185 | probe_scn_offset += sizeof (stap_sdt_probe_entry_v1); |
7186 | } | |
08b5a50c | 7187 | else if (probe_type == uprobe2_type) |
aff5d390 | 7188 | { |
79a0ca08 | 7189 | if (pbe_v2->name == 0) // No name possibly means we have a .so with a relocation |
c57ea854 | 7190 | return; |
79a0ca08 | 7191 | semaphore = pbe_v2->semaphore; |
aff5d390 | 7192 | probe_name = (char*)((char*)pdata->d_buf + pbe_v2->name - (char*)probe_scn_addr); |
a794dbeb | 7193 | provider_name = (char*)((char*)pdata->d_buf + pbe_v2->provider - (char*)probe_scn_addr); |
aff5d390 SC |
7194 | arg_count = pbe_v2->arg_count; |
7195 | pc = pbe_v2->pc; | |
7196 | if (pbe_v2->arg_string) | |
7197 | arg_string = (char*)((char*)pdata->d_buf + pbe_v2->arg_string - (char*)probe_scn_addr); | |
79a0ca08 SC |
7198 | // skip over pbe_v2, probe_name text and provider text |
7199 | probe_scn_offset = ((long)(pbe_v2->name) - (long)(probe_scn_addr)) + probe_name.length(); | |
7200 | probe_scn_offset += sizeof (__uint32_t) - probe_scn_offset % sizeof (__uint32_t); | |
aff5d390 | 7201 | } |
edce5b67 | 7202 | if (sess.verbose > 4) |
b530b5b3 | 7203 | clog << _("saw .probes ") << probe_name << (provider_name != "" ? _(" (provider ")+provider_name+") " : "") |
aff5d390 | 7204 | << "@0x" << hex << pc << dec << endl; |
edce5b67 | 7205 | |
e90006d7 JL |
7206 | dw.mod_info->marks.insert(make_pair(provider_name, probe_name)); |
7207 | ||
a794dbeb FCE |
7208 | if (dw.function_name_matches_pattern (probe_name, pp_mark) |
7209 | && ((pp_provider == "") || dw.function_name_matches_pattern (provider_name, pp_provider))) | |
c57ea854 | 7210 | handle_probe_entry (); |
edce5b67 | 7211 | } |
edce5b67 JS |
7212 | } |
7213 | ||
7214 | ||
6846cfc8 | 7215 | void |
4ddb6dd0 | 7216 | sdt_query::record_semaphore (vector<derived_probe *> & results, unsigned start) |
6846cfc8 | 7217 | { |
a794dbeb FCE |
7218 | for (unsigned i=0; i<2; i++) { |
7219 | // prefer with-provider symbol; look without provider prefix for backward compatibility only | |
7220 | string semaphore = (i==0 ? (provider_name+"_") : "") + probe_name + "_semaphore"; | |
7221 | // XXX: multiple addresses? | |
7222 | if (sess.verbose > 2) | |
b530b5b3 | 7223 | clog << _F("looking for semaphore symbol %s ", semaphore.c_str()); |
a794dbeb | 7224 | |
79a0ca08 SC |
7225 | Dwarf_Addr addr; |
7226 | if (this->semaphore) | |
7227 | addr = this->semaphore; | |
7228 | else | |
7229 | addr = lookup_symbol_address(dw.module, semaphore.c_str()); | |
a794dbeb FCE |
7230 | if (addr) |
7231 | { | |
7d395255 | 7232 | if (dwfl_module_relocations (dw.module) > 0) |
a794dbeb FCE |
7233 | dwfl_module_relocate_address (dw.module, &addr); |
7234 | // XXX: relocation basis? | |
909ab234 JS |
7235 | |
7236 | // Dyninst needs the *file*-based offset for semaphores, | |
7237 | // so subtract the difference in load addresses between .text and .probes | |
7238 | if (dw.sess.runtime_usermode_p()) | |
7239 | addr -= semaphore_load_offset; | |
7240 | ||
a794dbeb FCE |
7241 | for (unsigned i = start; i < results.size(); ++i) |
7242 | results[i]->sdt_semaphore_addr = addr; | |
7243 | if (sess.verbose > 2) | |
b530b5b3 | 7244 | clog << _(", found at 0x") << hex << addr << dec << endl; |
a794dbeb FCE |
7245 | return; |
7246 | } | |
7247 | else | |
7248 | if (sess.verbose > 2) | |
b530b5b3 | 7249 | clog << _(", not found") << endl; |
a794dbeb | 7250 | } |
6846cfc8 SC |
7251 | } |
7252 | ||
7253 | ||
edce5b67 JS |
7254 | void |
7255 | sdt_query::convert_probe (probe *base) | |
7256 | { | |
7257 | block *b = new block; | |
7258 | b->tok = base->body->tok; | |
7259 | ||
edce5b67 JS |
7260 | // Generate: if (arg1 != mark("label")) next; |
7261 | functioncall *fc = new functioncall; | |
bbafcb1e | 7262 | fc->function = "ulong_arg"; |
edce5b67 | 7263 | fc->tok = b->tok; |
bbafcb1e | 7264 | literal_number* num = new literal_number(1); |
edce5b67 JS |
7265 | num->tok = b->tok; |
7266 | fc->args.push_back(num); | |
7267 | ||
7268 | functioncall *fcus = new functioncall; | |
7269 | fcus->function = "user_string"; | |
7270 | fcus->type = pe_string; | |
7271 | fcus->tok = b->tok; | |
7272 | fcus->args.push_back(fc); | |
7273 | ||
7274 | if_statement *is = new if_statement; | |
7275 | is->thenblock = new next_statement; | |
7276 | is->elseblock = NULL; | |
7277 | is->tok = b->tok; | |
63ea4244 | 7278 | is->thenblock->tok = b->tok; |
edce5b67 JS |
7279 | comparison *be = new comparison; |
7280 | be->op = "!="; | |
7281 | be->tok = b->tok; | |
7282 | be->left = fcus; | |
7283 | be->right = new literal_string(probe_name); | |
63ea4244 | 7284 | be->right->tok = b->tok; |
edce5b67 JS |
7285 | is->condition = be; |
7286 | b->statements.push_back(is); | |
7287 | ||
7288 | // Now replace the body | |
7289 | b->statements.push_back(base->body); | |
7290 | base->body = b; | |
7291 | } | |
7292 | ||
7293 | ||
c72aa911 JS |
7294 | probe* |
7295 | sdt_query::convert_location () | |
edce5b67 | 7296 | { |
684b8718 JL |
7297 | string module = dw.module_name; |
7298 | if (has_process) | |
7299 | module = path_remove_sysroot(sess, module); | |
7300 | ||
c72aa911 | 7301 | probe_point* specific_loc = new probe_point(*base_loc); |
684b8718 JL |
7302 | specific_loc->well_formed = true; |
7303 | ||
662539d9 | 7304 | vector<probe_point::component*> derived_comps; |
edce5b67 | 7305 | |
662539d9 JS |
7306 | vector<probe_point::component*>::iterator it; |
7307 | for (it = specific_loc->components.begin(); | |
7308 | it != specific_loc->components.end(); ++it) | |
7309 | if ((*it)->functor == TOK_PROCESS) | |
7310 | { | |
684b8718 JL |
7311 | // replace the possibly incomplete path to process |
7312 | *it = new probe_point::component(TOK_PROCESS, | |
7313 | new literal_string(has_library ? path : module)); | |
7314 | ||
1cc41cd6 DS |
7315 | // copy the process name |
7316 | derived_comps.push_back(*it); | |
662539d9 JS |
7317 | } |
7318 | else if ((*it)->functor == TOK_LIBRARY) | |
7319 | { | |
1cc41cd6 DS |
7320 | // copy the library name for process probes |
7321 | derived_comps.push_back(*it); | |
662539d9 JS |
7322 | } |
7323 | else if ((*it)->functor == TOK_PROVIDER) | |
7324 | { | |
7325 | // replace the possibly wildcarded arg with the specific provider name | |
7326 | *it = new probe_point::component(TOK_PROVIDER, | |
7327 | new literal_string(provider_name)); | |
7328 | } | |
7329 | else if ((*it)->functor == TOK_MARK) | |
c72aa911 JS |
7330 | { |
7331 | // replace the possibly wildcarded arg with the specific marker name | |
662539d9 JS |
7332 | *it = new probe_point::component(TOK_MARK, |
7333 | new literal_string(probe_name)); | |
a794dbeb | 7334 | |
aff5d390 SC |
7335 | if (sess.verbose > 3) |
7336 | switch (probe_type) | |
7337 | { | |
7338 | case uprobe1_type: | |
b530b5b3 | 7339 | clog << _("probe_type == uprobe1, use statement addr: 0x") |
aff5d390 SC |
7340 | << hex << pc << dec << endl; |
7341 | break; | |
7342 | case uprobe2_type: | |
b530b5b3 | 7343 | clog << _("probe_type == uprobe2, use statement addr: 0x") |
aff5d390 SC |
7344 | << hex << pc << dec << endl; |
7345 | break; | |
40fe32e0 | 7346 | case uprobe3_type: |
b530b5b3 | 7347 | clog << _("probe_type == uprobe3, use statement addr: 0x") |
40fe32e0 SC |
7348 | << hex << pc << dec << endl; |
7349 | break; | |
aff5d390 | 7350 | default: |
b530b5b3 LB |
7351 | clog << _F("probe_type == use_uprobe_no_dwarf, use label name: _stapprobe1_%s", |
7352 | pp_mark.c_str()) << endl; | |
aff5d390 SC |
7353 | } |
7354 | ||
c72aa911 JS |
7355 | switch (probe_type) |
7356 | { | |
aff5d390 SC |
7357 | case uprobe1_type: |
7358 | case uprobe2_type: | |
40fe32e0 | 7359 | case uprobe3_type: |
c72aa911 | 7360 | // process("executable").statement(probe_arg) |
662539d9 JS |
7361 | derived_comps.push_back |
7362 | (new probe_point::component(TOK_STATEMENT, | |
7363 | new literal_number(pc, true))); | |
c72aa911 JS |
7364 | break; |
7365 | ||
a794dbeb | 7366 | default: // deprecated |
c72aa911 | 7367 | // process("executable").function("*").label("_stapprobe1_MARK_NAME") |
662539d9 JS |
7368 | derived_comps.push_back |
7369 | (new probe_point::component(TOK_FUNCTION, | |
7370 | new literal_string("*"))); | |
7371 | derived_comps.push_back | |
c72aa911 | 7372 | (new probe_point::component(TOK_LABEL, |
a794dbeb | 7373 | new literal_string("_stapprobe1_" + pp_mark))); |
c72aa911 JS |
7374 | break; |
7375 | } | |
7376 | } | |
edce5b67 | 7377 | |
662539d9 JS |
7378 | probe_point* derived_loc = new probe_point(*specific_loc); |
7379 | derived_loc->components = derived_comps; | |
8159bf55 | 7380 | return new probe (new probe (base_probe, specific_loc), derived_loc); |
edce5b67 JS |
7381 | } |
7382 | ||
7383 | ||
51d6bda3 SC |
7384 | void |
7385 | sdt_query::query_library (const char *library) | |
7386 | { | |
614f0fcf JL |
7387 | visited_libraries.insert(library); |
7388 | if (query_one_library (library, dw, user_lib, base_probe, base_loc, results)) | |
7389 | resolved_library = true; | |
51d6bda3 SC |
7390 | } |
7391 | ||
e90006d7 JL |
7392 | string |
7393 | suggest_marks(systemtap_session& sess, | |
7394 | const set<string>& modules, | |
7395 | const string& mark, | |
7396 | const string& provider) | |
7397 | { | |
7398 | if (mark.empty() || modules.empty() || sess.module_cache == NULL) | |
7399 | return ""; | |
7400 | ||
7401 | set<string> marks; | |
7402 | const map<string, module_info*> &cache = sess.module_cache->cache; | |
7403 | bool dash_suggestions = (mark.find("-") != string::npos); | |
7404 | ||
7405 | for (set<string>::iterator itmod = modules.begin(); | |
7406 | itmod != modules.end(); ++itmod) | |
7407 | { | |
7408 | map<string, module_info*>::const_iterator itcache; | |
7409 | if ((itcache = cache.find(*itmod)) != cache.end()) | |
7410 | { | |
7411 | set<pair<string,string> >::const_iterator itmarks; | |
7412 | for (itmarks = itcache->second->marks.begin(); | |
7413 | itmarks != itcache->second->marks.end(); ++itmarks) | |
7414 | { | |
7415 | if (provider.empty() | |
7416 | // simulating dw.function_name_matches_pattern() | |
7417 | || (fnmatch(provider.c_str(), itmarks->first.c_str(), 0) == 0)) | |
7418 | { | |
7419 | string marksug = itmarks->second; | |
7420 | if (dash_suggestions) | |
7421 | { | |
7422 | size_t pos = 0; | |
7423 | while (1) // there may be more than one | |
7424 | { | |
7425 | size_t i = marksug.find("__", pos); | |
7426 | if (i == string::npos) break; | |
7427 | marksug.replace (i, 2, "-"); | |
7428 | pos = i+1; // resume searching after the inserted - | |
7429 | } | |
7430 | } | |
7431 | marks.insert(marksug); | |
7432 | } | |
7433 | } | |
7434 | } | |
7435 | } | |
7436 | ||
7437 | if (sess.verbose > 2) | |
7438 | { | |
7439 | clog << "suggesting " << marks.size() << " marks " | |
7440 | << "from modules:" << endl; | |
7441 | for (set<string>::iterator itmod = modules.begin(); | |
7442 | itmod != modules.end(); ++itmod) | |
7443 | clog << *itmod << endl; | |
7444 | } | |
7445 | ||
7446 | if (marks.empty()) | |
7447 | return ""; | |
7448 | ||
7449 | return levenshtein_suggest(mark, marks, 5); // print top 5 marks only | |
7450 | } | |
7451 | ||
40a70f52 JL |
7452 | string |
7453 | suggest_plt_functions(systemtap_session& sess, | |
7454 | const set<string>& modules, | |
7455 | const string& func) | |
7456 | { | |
7457 | if (func.empty() || modules.empty() || sess.module_cache == NULL) | |
7458 | return ""; | |
7459 | ||
7460 | set<string> funcs; | |
7461 | const map<string, module_info*> &cache = sess.module_cache->cache; | |
7462 | ||
7463 | for (set<string>::iterator itmod = modules.begin(); | |
7464 | itmod != modules.end(); ++itmod) | |
7465 | { | |
7466 | map<string, module_info*>::const_iterator itcache; | |
7467 | if ((itcache = cache.find(*itmod)) != cache.end()) | |
7468 | funcs.insert(itcache->second->plt_funcs.begin(), | |
7469 | itcache->second->plt_funcs.end()); | |
7470 | } | |
7471 | ||
7472 | if (sess.verbose > 2) | |
d82dd71f JL |
7473 | { |
7474 | clog << "suggesting " << funcs.size() << " plt functions " | |
7475 | << "from modules:" << endl; | |
7476 | for (set<string>::iterator itmod = modules.begin(); | |
7477 | itmod != modules.end(); ++itmod) | |
7478 | clog << *itmod << endl; | |
7479 | } | |
40a70f52 JL |
7480 | |
7481 | if (funcs.empty()) | |
7482 | return ""; | |
7483 | ||
7484 | return levenshtein_suggest(func, funcs, 5); // print top 5 funcs only | |
7485 | } | |
51d6bda3 | 7486 | |
0508c45f JL |
7487 | string |
7488 | suggest_dwarf_functions(systemtap_session& sess, | |
7489 | const set<string>& modules, | |
7490 | string func) | |
44ffe90c JL |
7491 | { |
7492 | // Trim any @ component | |
7493 | size_t pos = func.find('@'); | |
7494 | if (pos != string::npos) | |
7495 | func.erase(pos); | |
7496 | ||
0508c45f | 7497 | if (func.empty() || modules.empty() || sess.module_cache == NULL) |
44ffe90c JL |
7498 | return ""; |
7499 | ||
7500 | // We must first aggregate all the functions from the cache | |
7501 | set<string> funcs; | |
7502 | const map<string, module_info*> &cache = sess.module_cache->cache; | |
7503 | ||
0508c45f JL |
7504 | for (set<string>::iterator itmod = modules.begin(); |
7505 | itmod != modules.end(); ++itmod) | |
44ffe90c | 7506 | { |
6e6d9a3b JL |
7507 | module_info *module; |
7508 | ||
7509 | // retrieve module_info from cache | |
44ffe90c JL |
7510 | map<string, module_info*>::const_iterator itcache; |
7511 | if ((itcache = cache.find(*itmod)) != cache.end()) | |
6e6d9a3b JL |
7512 | module = itcache->second; |
7513 | else // module not found | |
7514 | continue; | |
7515 | ||
7516 | // add inlines | |
7517 | funcs.insert(module->inlined_funcs.begin(), | |
7518 | module->inlined_funcs.end()); | |
7519 | ||
7520 | // add all function symbols in cache | |
7521 | if (module->symtab_status != info_present || module->sym_table == NULL) | |
7522 | continue; | |
7523 | map<string, func_info*>& modfuncs = module->sym_table->map_by_name; | |
7524 | for (map<string, func_info*>::const_iterator itfuncs = modfuncs.begin(); | |
7525 | itfuncs != modfuncs.end(); ++itfuncs) | |
7526 | funcs.insert(itfuncs->first); | |
44ffe90c JL |
7527 | } |
7528 | ||
7529 | if (sess.verbose > 2) | |
d82dd71f JL |
7530 | { |
7531 | clog << "suggesting " << funcs.size() << " dwarf functions " | |
7532 | << "from modules:" << endl; | |
7533 | for (set<string>::iterator itmod = modules.begin(); | |
7534 | itmod != modules.end(); ++itmod) | |
7535 | clog << *itmod << endl; | |
7536 | } | |
44ffe90c JL |
7537 | |
7538 | if (funcs.empty()) | |
7539 | return ""; | |
7540 | ||
593f09eb | 7541 | return levenshtein_suggest(func, funcs, 5); // print top 5 funcs only |
44ffe90c JL |
7542 | } |
7543 | ||
20c6c071 | 7544 | void |
5227f1ea | 7545 | dwarf_builder::build(systemtap_session & sess, |
7a053d3b | 7546 | probe * base, |
20c6c071 | 7547 | probe_point * location, |
86bf665e | 7548 | literal_map_t const & parameters, |
20c6c071 GH |
7549 | vector<derived_probe *> & finished_results) |
7550 | { | |
b20febf3 FCE |
7551 | // NB: the kernel/user dwlfpp objects are long-lived. |
7552 | // XXX: but they should be per-session, as this builder object | |
7553 | // may be reused if we try to cross-instrument multiple targets. | |
84048984 | 7554 | |
7a24d422 | 7555 | dwflpp* dw = 0; |
6d5d594e | 7556 | literal_map_t filled_parameters = parameters; |
7a24d422 | 7557 | |
7a24d422 | 7558 | string module_name; |
5c6f9e92 | 7559 | int64_t proc_pid; |
ae2552da FCE |
7560 | if (has_null_param (parameters, TOK_KERNEL)) |
7561 | { | |
7562 | dw = get_kern_dw(sess, "kernel"); | |
7563 | } | |
7564 | else if (get_param (parameters, TOK_MODULE, module_name)) | |
b8da0ad1 | 7565 | { |
c523a015 LB |
7566 | size_t dash_pos = 0; |
7567 | while((dash_pos=module_name.find('-'))!=string::npos) | |
7568 | module_name.replace(int(dash_pos),1,"_"); | |
7569 | filled_parameters[TOK_MODULE] = new literal_string(module_name); | |
37001baa FCE |
7570 | // NB: glob patterns get expanded later, during the offline |
7571 | // elfutils module listing. | |
ae2552da | 7572 | dw = get_kern_dw(sess, module_name); |
b8da0ad1 | 7573 | } |
5c6f9e92 | 7574 | else if (has_param(filled_parameters, TOK_PROCESS)) |
84c84ac4 | 7575 | { |
0ce4c32f FCE |
7576 | // NB: module_name is not yet set! |
7577 | ||
6d5d594e LB |
7578 | if(has_null_param(filled_parameters, TOK_PROCESS)) |
7579 | { | |
fc18e6c4 JL |
7580 | string file; |
7581 | try | |
7582 | { | |
7583 | file = sess.cmd_file(); | |
7584 | } | |
7585 | catch (const semantic_error& e) | |
7586 | { | |
6d9c4e46 | 7587 | if(sess.target_pid) |
1b6d5734 | 7588 | throw SEMANTIC_ERROR(_("invalid -x pid for unspecified process" |
6d9c4e46 AJ |
7589 | " probe [man stapprobes]"), NULL, NULL, &e); |
7590 | else | |
7591 | throw SEMANTIC_ERROR(_("invalid -c command for unspecified process" | |
fc18e6c4 JL |
7592 | " probe [man stapprobes]"), NULL, NULL, &e); |
7593 | } | |
48cd804a | 7594 | if(file.empty()) |
fc18e6c4 | 7595 | throw SEMANTIC_ERROR(_("unspecified process probe is invalid without" |
6d9c4e46 | 7596 | " a -c COMMAND or -x PID [man stapprobes]")); |
48cd804a | 7597 | module_name = sess.sysroot + file; |
6d5d594e | 7598 | filled_parameters[TOK_PROCESS] = new literal_string(module_name);// this needs to be used in place of the blank map |
0ce4c32f | 7599 | // in the case of TOK_MARK we need to modify locations as well // XXX why? |
6d5d594e | 7600 | if(location->components[0]->functor==TOK_PROCESS && |
0ce4c32f | 7601 | location->components[0]->arg == 0) |
6d5d594e | 7602 | location->components[0]->arg = new literal_string(module_name); |
5c6f9e92 AJ |
7603 | } |
7604 | ||
0ce4c32f FCE |
7605 | // NB: must specifically handle the classical ("string") form here, to make sure |
7606 | // we get the module_name out. | |
7607 | else if (get_param (parameters, TOK_PROCESS, module_name)) | |
7608 | { | |
7609 | module_name = sess.sysroot + module_name; | |
7610 | filled_parameters[TOK_PROCESS] = new literal_string(module_name); | |
7611 | } | |
7612 | ||
5c6f9e92 AJ |
7613 | else if (get_param (parameters, TOK_PROCESS, proc_pid)) |
7614 | { | |
6c484277 AJ |
7615 | // check that the pid given corresponds to a running process |
7616 | if (proc_pid < 1 || kill(proc_pid, 0) == -1) | |
7617 | switch (errno) // ignore EINVAL: invalid signal | |
7618 | { | |
7619 | case ESRCH: | |
7620 | throw SEMANTIC_ERROR(_("pid given does not correspond to a running process")); | |
7621 | case EPERM: | |
7622 | throw SEMANTIC_ERROR(_("invalid permissions for signalling given pid")); | |
7623 | default: | |
7624 | throw SEMANTIC_ERROR(_("invalid pid")); | |
7625 | } | |
7626 | ||
5c6f9e92 AJ |
7627 | string pid_path = string("/proc/") + lex_cast(proc_pid) + "/exe"; |
7628 | module_name = sess.sysroot + pid_path; | |
37635b45 | 7629 | |
0ce4c32f | 7630 | // in the case of TOK_MARK we need to modify locations as well // XXX why? |
5c6f9e92 | 7631 | if(location->components[0]->functor==TOK_PROCESS && |
0ce4c32f | 7632 | location->components[0]->arg == 0) |
5c6f9e92 | 7633 | location->components[0]->arg = new literal_string(module_name); |
0ce4c32f FCE |
7634 | // XXX: the above probably interferes with passing proc_pid to the new |
7635 | // uprobe_derived_probe p->pid, so the task-finder can associate this | |
7636 | // probe with only the given PID. | |
b78a0fbb | 7637 | } |
5750ecc6 | 7638 | |
37001baa FCE |
7639 | // PR6456 process("/bin/*") glob handling |
7640 | if (contains_glob_chars (module_name)) | |
7641 | { | |
7642 | // Expand glob via rewriting the probe-point process("....") | |
7643 | // parameter, asserted to be the first one. | |
7644 | ||
7645 | assert (location->components.size() > 0); | |
7646 | assert (location->components[0]->functor == TOK_PROCESS); | |
7647 | assert (location->components[0]->arg); | |
7648 | literal_string* lit = dynamic_cast<literal_string*>(location->components[0]->arg); | |
7649 | assert (lit); | |
7650 | ||
7651 | // Evaluate glob here, and call derive_probes recursively with each match. | |
7652 | glob_t the_blob; | |
88f8e2c0 | 7653 | set<string> dupes; |
37001baa | 7654 | int rc = glob (module_name.c_str(), 0, NULL, & the_blob); |
b530b5b3 | 7655 | if (rc) |
dc09353a | 7656 | throw SEMANTIC_ERROR (_F("glob %s error (%s)", module_name.c_str(), lex_cast(rc).c_str() )); |
44ffe90c | 7657 | unsigned results_pre = finished_results.size(); |
37001baa FCE |
7658 | for (unsigned i = 0; i < the_blob.gl_pathc; ++i) |
7659 | { | |
e19ebcf7 | 7660 | assert_no_interrupts(); |
37001baa FCE |
7661 | |
7662 | const char* globbed = the_blob.gl_pathv[i]; | |
7663 | struct stat st; | |
7664 | ||
7665 | if (access (globbed, X_OK) == 0 | |
7666 | && stat (globbed, &st) == 0 | |
7667 | && S_ISREG (st.st_mode)) // see find_executable() | |
7668 | { | |
7977a734 FCE |
7669 | // Need to call canonicalize here, in order to path-expand |
7670 | // patterns like process("stap*"). Otherwise it may go through | |
7671 | // to the next round of expansion as ("stap"), leading to a $PATH | |
7672 | // search that's not consistent with the glob search already done. | |
5bca76a8 JS |
7673 | string canononicalized = resolve_path (globbed); |
7674 | globbed = canononicalized.c_str(); | |
7977a734 | 7675 | |
88f8e2c0 JS |
7676 | // The canonical names can result in duplication, for example |
7677 | // having followed symlinks that are common with shared | |
7678 | // libraries. Filter those out. | |
7679 | if (!dupes.insert(canononicalized).second) | |
7680 | continue; | |
7681 | ||
37001baa FCE |
7682 | // synthesize a new probe_point, with the glob-expanded string |
7683 | probe_point *pp = new probe_point (*location); | |
ef0943df JL |
7684 | pp->from_glob = true; |
7685 | ||
5750ecc6 FCE |
7686 | // PR13338: quote results to prevent recursion |
7687 | string eglobbed = escape_glob_chars (globbed); | |
7688 | ||
7689 | if (sess.verbose > 1) | |
7690 | clog << _F("Expanded process(\"%s\") to process(\"%s\")", | |
7691 | module_name.c_str(), eglobbed.c_str()) << endl; | |
05fb3e0c | 7692 | string eglobbed_tgt = path_remove_sysroot(sess, eglobbed); |
5750ecc6 | 7693 | |
37001baa | 7694 | probe_point::component* ppc = new probe_point::component (TOK_PROCESS, |
05fb3e0c | 7695 | new literal_string (eglobbed_tgt)); |
37001baa FCE |
7696 | ppc->tok = location->components[0]->tok; // overwrite [0] slot, pattern matched above |
7697 | pp->components[0] = ppc; | |
7698 | ||
d885563b | 7699 | probe* new_probe = new probe (base, pp); |
7977a734 FCE |
7700 | |
7701 | // We override "optional = true" here, as if the | |
7702 | // wildcarded probe point was given a "?" suffix. | |
7703 | ||
7704 | // This is because wildcard probes will be expected | |
7705 | // by users to apply only to some subset of the | |
7706 | // matching binaries, in the sense of "any", rather | |
7707 | // than "all", sort of similarly how | |
7708 | // module("*").function("...") patterns work. | |
7709 | ||
7710 | derive_probes (sess, new_probe, finished_results, | |
7711 | true /* NB: not location->optional */ ); | |
37001baa FCE |
7712 | } |
7713 | } | |
7714 | ||
7715 | globfree (& the_blob); | |
44ffe90c JL |
7716 | |
7717 | unsigned results_post = finished_results.size(); | |
7718 | ||
e90006d7 | 7719 | // Did we fail to find a function/plt/mark by name? Let's suggest |
44ffe90c JL |
7720 | // something! |
7721 | string func; | |
7722 | if (results_pre == results_post | |
7723 | && get_param(filled_parameters, TOK_FUNCTION, func) | |
7724 | && !func.empty()) | |
7725 | { | |
0508c45f | 7726 | string sugs = suggest_dwarf_functions(sess, modules_seen, func); |
44ffe90c JL |
7727 | modules_seen.clear(); |
7728 | if (!sugs.empty()) | |
dc09353a | 7729 | throw SEMANTIC_ERROR (_NF("no match (similar function: %s)", |
44ffe90c JL |
7730 | "no match (similar functions: %s)", |
7731 | sugs.find(',') == string::npos, | |
7732 | sugs.c_str())); | |
7733 | } | |
40a70f52 JL |
7734 | else if (results_pre == results_post |
7735 | && get_param(filled_parameters, TOK_PLT, func) | |
7736 | && !func.empty()) | |
7737 | { | |
7738 | string sugs = suggest_plt_functions(sess, modules_seen, func); | |
7739 | modules_seen.clear(); | |
7740 | if (!sugs.empty()) | |
7741 | throw SEMANTIC_ERROR (_NF("no match (similar function: %s)", | |
7742 | "no match (similar functions: %s)", | |
7743 | sugs.find(',') == string::npos, | |
7744 | sugs.c_str())); | |
7745 | } | |
e90006d7 JL |
7746 | else if (results_pre == results_post |
7747 | && get_param(filled_parameters, TOK_MARK, func) | |
7748 | && !func.empty()) | |
7749 | { | |
7750 | string provider; | |
7751 | get_param(filled_parameters, TOK_PROVIDER, provider); | |
7752 | ||
7753 | string sugs = suggest_marks(sess, modules_seen, func, provider); | |
7754 | modules_seen.clear(); | |
7755 | if (!sugs.empty()) | |
7756 | throw SEMANTIC_ERROR (_NF("no match (similar mark: %s)", | |
7757 | "no match (similar marks: %s)", | |
7758 | sugs.find(',') == string::npos, | |
7759 | sugs.c_str())); | |
7760 | } | |
44ffe90c | 7761 | |
37001baa FCE |
7762 | return; // avoid falling through |
7763 | } | |
7764 | ||
5750ecc6 FCE |
7765 | // PR13338: unquote glob results |
7766 | module_name = unescape_glob_chars (module_name); | |
05fb3e0c | 7767 | user_path = find_executable (module_name, "", sess.sysenv); // canonicalize it |
5fa0d811 JL |
7768 | if (!is_fully_resolved(user_path, "", sess.sysenv)) |
7769 | throw SEMANTIC_ERROR(_F("cannot find executable '%s'", | |
7770 | user_path.c_str())); | |
d1bcbe71 RH |
7771 | |
7772 | // if the executable starts with "#!", we look for the interpreter of the script | |
7773 | { | |
7774 | ifstream script_file (user_path.c_str () ); | |
7775 | ||
7776 | if (script_file.good ()) | |
7777 | { | |
7778 | string line; | |
7779 | ||
7780 | getline (script_file, line); | |
7781 | ||
7782 | if (line.compare (0, 2, "#!") == 0) | |
7783 | { | |
7784 | string path_head = line.substr(2); | |
7785 | ||
7786 | // remove white spaces at the beginning of the string | |
7787 | size_t p2 = path_head.find_first_not_of(" \t"); | |
7788 | ||
7789 | if (p2 != string::npos) | |
7790 | { | |
7791 | string path = path_head.substr(p2); | |
7792 | ||
7793 | // remove white spaces at the end of the string | |
7794 | p2 = path.find_last_not_of(" \t\n"); | |
7795 | if (string::npos != p2) | |
7796 | path.erase(p2+1); | |
7797 | ||
8e13c1a1 RH |
7798 | // handle "#!/usr/bin/env" redirect |
7799 | size_t offset = 0; | |
7800 | if (path.compare(0, sizeof("/bin/env")-1, "/bin/env") == 0) | |
7801 | { | |
7802 | offset = sizeof("/bin/env")-1; | |
7803 | } | |
7804 | else if (path.compare(0, sizeof("/usr/bin/env")-1, "/usr/bin/env") == 0) | |
7805 | { | |
7806 | offset = sizeof("/usr/bin/env")-1; | |
7807 | } | |
7808 | ||
7809 | if (offset != 0) | |
7810 | { | |
7811 | size_t p3 = path.find_first_not_of(" \t", offset); | |
7812 | ||
7813 | if (p3 != string::npos) | |
7814 | { | |
7815 | string env_path = path.substr(p3); | |
05fb3e0c WF |
7816 | user_path = find_executable (env_path, sess.sysroot, |
7817 | sess.sysenv); | |
8e13c1a1 RH |
7818 | } |
7819 | } | |
7820 | else | |
7821 | { | |
05fb3e0c | 7822 | user_path = find_executable (path, sess.sysroot, sess.sysenv); |
8e13c1a1 | 7823 | } |
d1bcbe71 RH |
7824 | |
7825 | struct stat st; | |
7826 | ||
7827 | if (access (user_path.c_str(), X_OK) == 0 | |
7828 | && stat (user_path.c_str(), &st) == 0 | |
7829 | && S_ISREG (st.st_mode)) // see find_executable() | |
7830 | { | |
7831 | if (sess.verbose > 1) | |
b530b5b3 LB |
7832 | clog << _F("Expanded process(\"%s\") to process(\"%s\")", |
7833 | module_name.c_str(), user_path.c_str()) << endl; | |
d1bcbe71 RH |
7834 | |
7835 | assert (location->components.size() > 0); | |
7836 | assert (location->components[0]->functor == TOK_PROCESS); | |
7837 | assert (location->components[0]->arg); | |
7838 | literal_string* lit = dynamic_cast<literal_string*>(location->components[0]->arg); | |
7839 | assert (lit); | |
7840 | ||
7841 | // synthesize a new probe_point, with the expanded string | |
7842 | probe_point *pp = new probe_point (*location); | |
05fb3e0c | 7843 | string user_path_tgt = path_remove_sysroot(sess, user_path); |
d1bcbe71 | 7844 | probe_point::component* ppc = new probe_point::component (TOK_PROCESS, |
05fb3e0c | 7845 | new literal_string (user_path_tgt.c_str())); |
d1bcbe71 RH |
7846 | ppc->tok = location->components[0]->tok; // overwrite [0] slot, pattern matched above |
7847 | pp->components[0] = ppc; | |
7848 | ||
d885563b | 7849 | probe* new_probe = new probe (base, pp); |
d1bcbe71 RH |
7850 | |
7851 | derive_probes (sess, new_probe, finished_results); | |
7852 | ||
7853 | script_file.close(); | |
7854 | return; | |
7855 | } | |
7856 | } | |
7857 | } | |
7858 | } | |
7859 | script_file.close(); | |
7860 | } | |
7861 | ||
dbe9d133 JL |
7862 | // If this is a library probe, then target the library module instead. We |
7863 | // do this only if the library path is already fully resolved (such as | |
7864 | // what query_one_library() would have done for us). Otherwise, we resort | |
7865 | // to iterate_over_libraries. | |
7866 | if (get_param (parameters, TOK_LIBRARY, user_lib) && !user_lib.empty() | |
7867 | && is_fully_resolved(user_lib, sess.sysroot, sess.sysenv, "LD_LIBRARY_PATH")) | |
7868 | module_name = user_lib; | |
63b4fd14 | 7869 | else |
dbe9d133 | 7870 | module_name = user_path; // canonicalize it |
d0a7f5a9 | 7871 | |
3667d615 | 7872 | // uretprobes aren't available everywhere |
536f1261 | 7873 | if (has_null_param(parameters, TOK_RETURN) && !sess.runtime_usermode_p()) |
2b69faaf | 7874 | { |
3667d615 JS |
7875 | if (kernel_supports_inode_uprobes(sess) && |
7876 | !kernel_supports_inode_uretprobes(sess)) | |
dc09353a | 7877 | throw SEMANTIC_ERROR |
3ffeaf3c | 7878 | (_("process return probes not available [man error::inode-uprobes]")); |
2b69faaf | 7879 | } |
3667d615 | 7880 | |
f4000852 MW |
7881 | // There is a similar check in pass 4 (buildrun), but it is |
7882 | // needed here too to make sure alternatives for optional | |
7883 | // (? or !) process probes are disposed and/or alternatives | |
7884 | // are selected. | |
3667d615 JS |
7885 | if (!sess.runtime_usermode_p()) |
7886 | check_process_probe_kernel_support(sess); | |
e34d5d13 | 7887 | |
7a24d422 FCE |
7888 | // user-space target; we use one dwflpp instance per module name |
7889 | // (= program or shared library) | |
707bf35e | 7890 | dw = get_user_dw(sess, module_name); |
c8959a29 | 7891 | } |
20c6c071 | 7892 | |
1acfc030 JS |
7893 | assert(dw); |
7894 | ||
e90006d7 JL |
7895 | unsigned results_pre = finished_results.size(); |
7896 | ||
5896cd05 | 7897 | if (sess.verbose > 3) |
b530b5b3 | 7898 | clog << _F("dwarf_builder::build for %s", module_name.c_str()) << endl; |
5896cd05 | 7899 | |
a794dbeb FCE |
7900 | string dummy_mark_name; // NB: PR10245: dummy value, need not substitute - => __ |
7901 | if (get_param(parameters, TOK_MARK, dummy_mark_name)) | |
f28a8c28 | 7902 | { |
51d6bda3 | 7903 | sdt_query sdtq(base, location, *dw, filled_parameters, finished_results, user_lib); |
06de3a04 | 7904 | dw->iterate_over_modules<base_query>(&query_module, &sdtq); |
e90006d7 JL |
7905 | |
7906 | // We need to update modules_seen with the modules we've visited | |
7907 | modules_seen.insert(sdtq.visited_modules.begin(), | |
7908 | sdtq.visited_modules.end()); | |
7909 | ||
614f0fcf JL |
7910 | string lib; |
7911 | if (results_pre == finished_results.size() && !sdtq.resolved_library | |
7912 | && get_param(filled_parameters, TOK_LIBRARY, lib) | |
7913 | && !lib.empty() && !sdtq.visited_libraries.empty()) | |
7914 | { | |
7915 | // The library didn't fit any DT_NEEDED libraries. As a last effort, | |
7916 | // let's try to look for the library directly. | |
7917 | string resolved_lib = find_executable(lib, sess.sysroot, sess.sysenv, | |
7918 | "LD_LIBRARY_PATH"); | |
7919 | if (resolved_lib.find('/') != string::npos) | |
7920 | { | |
7921 | probe *new_base = build_library_probe(*dw, resolved_lib, | |
7922 | base, location); | |
7923 | derive_probes(sess, new_base, finished_results); | |
7924 | sess.print_warning(_F("'%s' is not a needed library of '%s'. " | |
7925 | "Specify the full path to squelch this warning.", | |
7926 | resolved_lib.c_str(), dw->module_name.c_str())); | |
7927 | return; | |
7928 | } | |
f23e4abe JL |
7929 | |
7930 | // Otherwise, let's suggest from the DT_NEEDED libraries | |
7931 | string sugs = levenshtein_suggest(lib, sdtq.visited_libraries, 5); | |
7932 | if (!sugs.empty()) | |
7933 | throw SEMANTIC_ERROR (_NF("no match (similar library: %s)", | |
7934 | "no match (similar libraries: %s)", | |
7935 | sugs.find(',') == string::npos, | |
7936 | sugs.c_str())); | |
614f0fcf JL |
7937 | } |
7938 | ||
e90006d7 JL |
7939 | // Did we fail to find a mark? |
7940 | if (results_pre == finished_results.size() && !location->from_glob) | |
7941 | { | |
7942 | string provider; | |
7943 | get_param(filled_parameters, TOK_PROVIDER, provider); | |
7944 | ||
7945 | string sugs = suggest_marks(sess, modules_seen, dummy_mark_name, provider); | |
7946 | modules_seen.clear(); | |
7947 | if (!sugs.empty()) | |
7948 | throw SEMANTIC_ERROR (_NF("no match (similar mark: %s)", | |
7949 | "no match (similar marks: %s)", | |
7950 | sugs.find(',') == string::npos, | |
7951 | sugs.c_str())); | |
7952 | } | |
7953 | ||
edce5b67 | 7954 | return; |
7a05f484 | 7955 | } |
20c6c071 | 7956 | |
6d5d594e | 7957 | dwarf_query q(base, location, *dw, filled_parameters, finished_results, user_path, user_lib); |
7a24d422 FCE |
7958 | |
7959 | // XXX: kernel.statement.absolute is a special case that requires no | |
7960 | // dwfl processing. This code should be in a separate builder. | |
7a24d422 | 7961 | if (q.has_kernel && q.has_absolute) |
37ebca01 | 7962 | { |
4baf0e53 | 7963 | // assert guru mode for absolute probes |
37ebca01 FCE |
7964 | if (! q.base_probe->privileged) |
7965 | { | |
dc09353a | 7966 | throw SEMANTIC_ERROR (_("absolute statement probe in unprivileged script; need stap -g"), |
edce5b67 | 7967 | q.base_probe->tok); |
37ebca01 FCE |
7968 | } |
7969 | ||
7970 | // For kernel.statement(NUM).absolute probe points, we bypass | |
7971 | // all the debuginfo stuff: We just wire up a | |
7972 | // dwarf_derived_probe right here and now. | |
4baf0e53 | 7973 | dwarf_derived_probe* p = |
b8da0ad1 FCE |
7974 | new dwarf_derived_probe ("", "", 0, "kernel", "", |
7975 | q.statement_num_val, q.statement_num_val, | |
7976 | q, 0); | |
37ebca01 | 7977 | finished_results.push_back (p); |
1a0dbc5a | 7978 | sess.unwindsym_modules.insert ("kernel"); |
37ebca01 FCE |
7979 | return; |
7980 | } | |
7981 | ||
06de3a04 | 7982 | dw->iterate_over_modules<base_query>(&query_module, &q); |
8f14e444 | 7983 | |
44ffe90c JL |
7984 | // We need to update modules_seen with the modules we've visited |
7985 | modules_seen.insert(q.visited_modules.begin(), | |
7986 | q.visited_modules.end()); | |
8f14e444 FCE |
7987 | |
7988 | // PR11553 special processing: .return probes requested, but | |
7989 | // some inlined function instances matched. | |
7990 | unsigned i_n_r = q.inlined_non_returnable.size(); | |
7991 | unsigned results_post = finished_results.size(); | |
7992 | if (i_n_r > 0) | |
7993 | { | |
7994 | if ((results_pre == results_post) && (! sess.suppress_warnings)) // no matches; issue warning | |
7995 | { | |
7996 | string quicklist; | |
7997 | for (set<string>::iterator it = q.inlined_non_returnable.begin(); | |
7998 | it != q.inlined_non_returnable.end(); | |
7999 | it++) | |
8000 | { | |
8001 | quicklist += " " + (*it); | |
8002 | if (quicklist.size() > 80) // heuristic, don't make an overlong report line | |
8003 | { | |
8004 | quicklist += " ..."; | |
8005 | break; | |
8006 | } | |
8007 | } | |
c57ea854 | 8008 | |
52c2652f | 8009 | sess.print_warning (_NF("cannot probe .return of %u inlined function %s", |
b530b5b3 | 8010 | "cannot probe .return of %u inlined functions %s", |
52c2652f | 8011 | quicklist.size(), i_n_r, quicklist.c_str())); |
8f14e444 FCE |
8012 | // There will be also a "no matches" semantic error generated. |
8013 | } | |
8014 | if (sess.verbose > 1) | |
52c2652f NMA |
8015 | clog << _NF("skipped .return probe of %u inlined function", |
8016 | "skipped .return probe of %u inlined functions", i_n_r, i_n_r) << endl; | |
8f14e444 FCE |
8017 | if ((sess.verbose > 3) || (sess.verbose > 2 && results_pre == results_post)) // issue details with high verbosity |
8018 | { | |
8019 | for (set<string>::iterator it = q.inlined_non_returnable.begin(); | |
8020 | it != q.inlined_non_returnable.end(); | |
8021 | it++) | |
8022 | clog << (*it) << " "; | |
8023 | clog << endl; | |
8024 | } | |
8025 | } // i_n_r > 0 | |
44ffe90c | 8026 | |
614f0fcf JL |
8027 | string lib; |
8028 | if (results_pre == results_post && !q.resolved_library | |
8029 | && get_param(filled_parameters, TOK_LIBRARY, lib) | |
8030 | && !lib.empty() && !q.visited_libraries.empty()) | |
8031 | { | |
8032 | // The library didn't fit any DT_NEEDED libraries. As a last effort, | |
8033 | // let's try to look for the library directly. | |
8034 | string resolved_lib = find_executable(lib, sess.sysroot, sess.sysenv, | |
8035 | "LD_LIBRARY_PATH"); | |
8036 | if (resolved_lib.find('/') != string::npos) | |
8037 | { | |
8038 | probe *new_base = build_library_probe(*dw, resolved_lib, | |
8039 | base, location); | |
8040 | derive_probes(sess, new_base, finished_results); | |
8041 | sess.print_warning(_F("'%s' is not a needed library of '%s'. " | |
8042 | "Specify the full path to squelch this warning.", | |
8043 | resolved_lib.c_str(), dw->module_name.c_str())); | |
8044 | return; | |
8045 | } | |
f23e4abe JL |
8046 | |
8047 | // Otherwise, let's suggest from the DT_NEEDED libraries | |
8048 | string sugs = levenshtein_suggest(lib, q.visited_libraries, 5); | |
8049 | if (!sugs.empty()) | |
8050 | throw SEMANTIC_ERROR (_NF("no match (similar library: %s)", | |
8051 | "no match (similar libraries: %s)", | |
8052 | sugs.find(',') == string::npos, | |
8053 | sugs.c_str())); | |
614f0fcf JL |
8054 | } |
8055 | ||
e90006d7 | 8056 | // If we just failed to resolve a function/plt by name, we can suggest |
ef0943df JL |
8057 | // something. We only suggest things for probe points that were not |
8058 | // synthesized from a glob, i.e. only for 'real' probes. This is also | |
8059 | // required because modules_seen needs to accumulate across recursive | |
8060 | // calls for process(glob)[.library(glob)] probes. | |
44ffe90c | 8061 | string func; |
ef0943df | 8062 | if (results_pre == results_post && !location->from_glob |
44ffe90c JL |
8063 | && get_param(filled_parameters, TOK_FUNCTION, func) |
8064 | && !func.empty()) | |
8065 | { | |
0508c45f | 8066 | string sugs = suggest_dwarf_functions(sess, modules_seen, func); |
44ffe90c JL |
8067 | modules_seen.clear(); |
8068 | if (!sugs.empty()) | |
dc09353a | 8069 | throw SEMANTIC_ERROR (_NF("no match (similar function: %s)", |
44ffe90c JL |
8070 | "no match (similar functions: %s)", |
8071 | sugs.find(',') == string::npos, | |
8072 | sugs.c_str())); | |
8073 | } | |
ef0943df | 8074 | else if (results_pre == results_post && !location->from_glob |
40a70f52 JL |
8075 | && get_param(filled_parameters, TOK_PLT, func) |
8076 | && !func.empty()) | |
8077 | { | |
8078 | string sugs = suggest_plt_functions(sess, modules_seen, func); | |
8079 | modules_seen.clear(); | |
8080 | if (!sugs.empty()) | |
8081 | throw SEMANTIC_ERROR (_NF("no match (similar function: %s)", | |
8082 | "no match (similar functions: %s)", | |
8083 | sugs.find(',') == string::npos, | |
8084 | sugs.c_str())); | |
8085 | } | |
44ffe90c JL |
8086 | else if (results_pre != results_post) |
8087 | // Something was derived so we won't need to suggest something | |
8088 | modules_seen.clear(); | |
5f0a03a6 JK |
8089 | } |
8090 | ||
8091 | symbol_table::~symbol_table() | |
8092 | { | |
c9efa5c9 | 8093 | delete_map(map_by_addr); |
5f0a03a6 JK |
8094 | } |
8095 | ||
8096 | void | |
2867a2a1 | 8097 | symbol_table::add_symbol(const char *name, bool weak, bool descriptor, |
44ffe90c | 8098 | Dwarf_Addr addr, Dwarf_Addr* /*high_addr*/) |
5f0a03a6 | 8099 | { |
ab91b232 JK |
8100 | #ifdef __powerpc__ |
8101 | // Map ".sys_foo" to "sys_foo". | |
8102 | if (name[0] == '.') | |
8103 | name++; | |
8104 | #endif | |
5f0a03a6 JK |
8105 | func_info *fi = new func_info(); |
8106 | fi->addr = addr; | |
8107 | fi->name = name; | |
ab91b232 | 8108 | fi->weak = weak; |
2867a2a1 | 8109 | fi->descriptor = descriptor; |
5f0a03a6 JK |
8110 | map_by_name[fi->name] = fi; |
8111 | // TODO: Use a multimap in case there are multiple static | |
8112 | // functions with the same name? | |
1c6b77e5 | 8113 | map_by_addr.insert(make_pair(addr, fi)); |
5f0a03a6 JK |
8114 | } |
8115 | ||
46f7b6be | 8116 | void |
f98c6346 | 8117 | symbol_table::prepare_section_rejection(Dwfl_Module *mod __attribute__ ((unused))) |
46f7b6be JK |
8118 | { |
8119 | #ifdef __powerpc__ | |
8120 | /* | |
8121 | * The .opd section contains function descriptors that can look | |
8122 | * just like function entry points. For example, there's a function | |
8123 | * descriptor called "do_exit" that links to the entry point ".do_exit". | |
8124 | * Reject all symbols in .opd. | |
8125 | */ | |
8126 | opd_section = SHN_UNDEF; | |
8127 | Dwarf_Addr bias; | |
8128 | Elf* elf = (dwarf_getelf (dwfl_module_getdwarf (mod, &bias)) | |
8129 | ?: dwfl_module_getelf (mod, &bias)); | |
8130 | Elf_Scn* scn = 0; | |
8131 | size_t shstrndx; | |
8132 | ||
8133 | if (!elf) | |
8134 | return; | |
fcc30d6d | 8135 | if (elf_getshdrstrndx (elf, &shstrndx) != 0) |
46f7b6be JK |
8136 | return; |
8137 | while ((scn = elf_nextscn(elf, scn)) != NULL) | |
8138 | { | |
8139 | GElf_Shdr shdr_mem; | |
8140 | GElf_Shdr *shdr = gelf_getshdr(scn, &shdr_mem); | |
8141 | if (!shdr) | |
8142 | continue; | |
8143 | const char *name = elf_strptr(elf, shstrndx, shdr->sh_name); | |
8144 | if (!strcmp(name, ".opd")) | |
8145 | { | |
8146 | opd_section = elf_ndxscn(scn); | |
8147 | return; | |
8148 | } | |
8149 | } | |
8150 | #endif | |
8151 | } | |
8152 | ||
8153 | bool | |
8154 | symbol_table::reject_section(GElf_Word section) | |
8155 | { | |
8156 | if (section == SHN_UNDEF) | |
8157 | return true; | |
8158 | #ifdef __powerpc__ | |
8159 | if (section == opd_section) | |
8160 | return true; | |
8161 | #endif | |
8162 | return false; | |
8163 | } | |
8164 | ||
5f0a03a6 JK |
8165 | enum info_status |
8166 | symbol_table::get_from_elf() | |
8167 | { | |
8168 | Dwarf_Addr high_addr = 0; | |
8169 | Dwfl_Module *mod = mod_info->mod; | |
8170 | int syments = dwfl_module_getsymtab(mod); | |
8171 | assert(syments); | |
46f7b6be | 8172 | prepare_section_rejection(mod); |
5f0a03a6 JK |
8173 | for (int i = 1; i < syments; ++i) |
8174 | { | |
8175 | GElf_Sym sym; | |
ab91b232 | 8176 | GElf_Word section; |
cba67d8f MW |
8177 | const char *name; |
8178 | GElf_Addr addr; | |
8179 | bool reject; | |
8180 | ||
8181 | /* Note that dwfl_module_getsym does adjust the sym.st_value but doesn't | |
8182 | try to resolve it to a function address. dwfl_module_getsym_info leaves | |
8183 | the st_value in tact (no adjustment applied) and returns the fully | |
8184 | resolved address separately. In that case we can simply reject the | |
8185 | symbol if it is SHN_UNDEF and don't need to call reject_section which | |
8186 | does extra checks to see whether the address fall in an architecture | |
8187 | specific descriptor table (which will never be the case when using the | |
8188 | new dwfl_module_getsym_info). dwfl_module_getsym will only provide us | |
8189 | with the (adjusted) st_value of the symbol, which might point into a | |
8190 | function descriptor table. So in that case we still have to call | |
8191 | reject_section. */ | |
8192 | #if _ELFUTILS_PREREQ (0, 158) | |
8193 | name = dwfl_module_getsym_info (mod, i, &sym, &addr, §ion, | |
8194 | NULL, NULL); | |
8195 | reject = section == SHN_UNDEF; | |
8196 | #else | |
8197 | name = dwfl_module_getsym (mod, i, &sym, §ion); | |
b23098cd | 8198 | addr = sym.st_value; |
cba67d8f MW |
8199 | reject = reject_section(section); |
8200 | #endif | |
8201 | ||
2867a2a1 | 8202 | if (name && GELF_ST_TYPE(sym.st_info) == STT_FUNC) |
ab91b232 | 8203 | add_symbol(name, (GELF_ST_BIND(sym.st_info) == STB_WEAK), |
cba67d8f | 8204 | reject, addr, &high_addr); |
2a4acb09 JL |
8205 | if (name && GELF_ST_TYPE(sym.st_info) == STT_OBJECT |
8206 | && GELF_ST_BIND(sym.st_info) == STB_GLOBAL) | |
8207 | globals[name] = addr; | |
8208 | if (name && GELF_ST_TYPE(sym.st_info) == STT_OBJECT | |
8209 | && GELF_ST_BIND(sym.st_info) == STB_LOCAL) | |
8210 | locals[name] = addr; | |
5f0a03a6 JK |
8211 | } |
8212 | return info_present; | |
8213 | } | |
8214 | ||
5f0a03a6 JK |
8215 | func_info * |
8216 | symbol_table::get_func_containing_address(Dwarf_Addr addr) | |
8217 | { | |
1c6b77e5 JS |
8218 | iterator_t iter = map_by_addr.upper_bound(addr); |
8219 | if (iter == map_by_addr.begin()) | |
5f0a03a6 | 8220 | return NULL; |
2e67a43b | 8221 | else |
1c6b77e5 | 8222 | return (--iter)->second; |
5f0a03a6 JK |
8223 | } |
8224 | ||
3d372d6b SC |
8225 | func_info * |
8226 | symbol_table::get_first_func() | |
8227 | { | |
8228 | iterator_t iter = map_by_addr.begin(); | |
8229 | return (iter)->second; | |
8230 | } | |
8231 | ||
5f0a03a6 JK |
8232 | func_info * |
8233 | symbol_table::lookup_symbol(const string& name) | |
8234 | { | |
8235 | map<string, func_info*>::iterator i = map_by_name.find(name); | |
8236 | if (i == map_by_name.end()) | |
8237 | return NULL; | |
8238 | return i->second; | |
8239 | } | |
8240 | ||
8241 | Dwarf_Addr | |
8242 | symbol_table::lookup_symbol_address(const string& name) | |
8243 | { | |
8244 | func_info *fi = lookup_symbol(name); | |
8245 | if (fi) | |
8246 | return fi->addr; | |
8247 | return 0; | |
8248 | } | |
8249 | ||
ab91b232 JK |
8250 | // This is the kernel symbol table. The kernel macro cond_syscall creates |
8251 | // a weak symbol for each system call and maps it to sys_ni_syscall. | |
8252 | // For system calls not implemented elsewhere, this weak symbol shows up | |
8253 | // in the kernel symbol table. Following the precedent of dwarfful stap, | |
8254 | // we refuse to consider such symbols. Here we delete them from our | |
8255 | // symbol table. | |
8256 | // TODO: Consider generalizing this and/or making it part of blacklist | |
8257 | // processing. | |
8258 | void | |
8259 | symbol_table::purge_syscall_stubs() | |
8260 | { | |
8261 | Dwarf_Addr stub_addr = lookup_symbol_address("sys_ni_syscall"); | |
8262 | if (stub_addr == 0) | |
8263 | return; | |
1c6b77e5 | 8264 | range_t purge_range = map_by_addr.equal_range(stub_addr); |
2e67a43b TM |
8265 | for (iterator_t iter = purge_range.first; |
8266 | iter != purge_range.second; | |
1c6b77e5 | 8267 | ) |
ab91b232 | 8268 | { |
1c6b77e5 | 8269 | func_info *fi = iter->second; |
2e67a43b | 8270 | if (fi->weak && fi->name != "sys_ni_syscall") |
ab91b232 | 8271 | { |
2e67a43b | 8272 | map_by_name.erase(fi->name); |
1c6b77e5 | 8273 | map_by_addr.erase(iter++); |
2e67a43b | 8274 | delete fi; |
2e67a43b | 8275 | } |
1c6b77e5 JS |
8276 | else |
8277 | iter++; | |
ab91b232 JK |
8278 | } |
8279 | } | |
8280 | ||
5f0a03a6 | 8281 | void |
5f52fafe | 8282 | module_info::get_symtab() |
5f0a03a6 | 8283 | { |
1c6b77e5 JS |
8284 | if (symtab_status != info_unknown) |
8285 | return; | |
8286 | ||
5f0a03a6 JK |
8287 | sym_table = new symbol_table(this); |
8288 | if (!elf_path.empty()) | |
8289 | { | |
5f0a03a6 JK |
8290 | symtab_status = sym_table->get_from_elf(); |
8291 | } | |
8292 | else | |
8293 | { | |
8294 | assert(name == TOK_KERNEL); | |
ab3ed72d DS |
8295 | symtab_status = info_absent; |
8296 | cerr << _("Error: Cannot find vmlinux.") << endl;; | |
5f0a03a6 JK |
8297 | } |
8298 | if (symtab_status == info_absent) | |
8299 | { | |
8300 | delete sym_table; | |
8301 | sym_table = NULL; | |
8302 | return; | |
8303 | } | |
8304 | ||
ab91b232 JK |
8305 | if (name == TOK_KERNEL) |
8306 | sym_table->purge_syscall_stubs(); | |
5f0a03a6 JK |
8307 | } |
8308 | ||
1c6b77e5 JS |
8309 | // update_symtab reconciles data between the elf symbol table and the dwarf |
8310 | // function enumeration. It updates the symbol table entries with the dwarf | |
8311 | // die that describes the function, which also signals to query_module_symtab | |
8312 | // that a statement probe isn't needed. In return, it also adds aliases to the | |
8313 | // function table for names that share the same addr/die. | |
8314 | void | |
8315 | module_info::update_symtab(cu_function_cache_t *funcs) | |
8316 | { | |
8317 | if (!sym_table) | |
8318 | return; | |
8319 | ||
8320 | cu_function_cache_t new_funcs; | |
8321 | ||
8322 | for (cu_function_cache_t::iterator func = funcs->begin(); | |
8323 | func != funcs->end(); func++) | |
8324 | { | |
8325 | // optimization: inlines will never be in the symbol table | |
8326 | if (dwarf_func_inline(&func->second) != 0) | |
6e6d9a3b JL |
8327 | { |
8328 | inlined_funcs.insert(func->first); | |
8329 | continue; | |
8330 | } | |
1c6b77e5 | 8331 | |
1ffb8bd1 JS |
8332 | // XXX We may want to make additional efforts to match mangled elf names |
8333 | // to dwarf too. MIPS_linkage_name can help, but that's sometimes | |
8334 | // missing, so we may also need to try matching by address. See also the | |
8335 | // notes about _Z in dwflpp::iterate_over_functions(). | |
8336 | ||
1c6b77e5 JS |
8337 | func_info *fi = sym_table->lookup_symbol(func->first); |
8338 | if (!fi) | |
8339 | continue; | |
8340 | ||
8341 | // iterate over all functions at the same address | |
8342 | symbol_table::range_t er = sym_table->map_by_addr.equal_range(fi->addr); | |
8343 | for (symbol_table::iterator_t it = er.first; it != er.second; ++it) | |
8344 | { | |
8345 | // update this function with the dwarf die | |
8346 | it->second->die = func->second; | |
8347 | ||
8348 | // if this function is a new alias, then | |
8349 | // save it to merge into the function cache | |
8350 | if (it->second != fi) | |
b7478964 | 8351 | new_funcs.insert(make_pair(it->second->name, it->second->die)); |
1c6b77e5 JS |
8352 | } |
8353 | } | |
8354 | ||
8355 | // add all discovered aliases back into the function cache | |
8356 | // NB: this won't replace any names that dwarf may have already found | |
8357 | funcs->insert(new_funcs.begin(), new_funcs.end()); | |
8358 | } | |
8359 | ||
5f0a03a6 JK |
8360 | module_info::~module_info() |
8361 | { | |
8362 | if (sym_table) | |
8363 | delete sym_table; | |
b55bc428 FCE |
8364 | } |
8365 | ||
935447c8 | 8366 | // ------------------------------------------------------------------------ |
888af770 | 8367 | // user-space probes |
935447c8 DS |
8368 | // ------------------------------------------------------------------------ |
8369 | ||
935447c8 | 8370 | |
888af770 | 8371 | struct uprobe_derived_probe_group: public generic_dpg<uprobe_derived_probe> |
935447c8 | 8372 | { |
89ba3085 FCE |
8373 | private: |
8374 | string make_pbm_key (uprobe_derived_probe* p) { | |
cfcab6c7 | 8375 | return p->path + "|" + p->module + "|" + p->section + "|" + lex_cast(p->pid); |
89ba3085 FCE |
8376 | } |
8377 | ||
cfcab6c7 JS |
8378 | void emit_module_maxuprobes (systemtap_session& s); |
8379 | ||
2b69faaf JS |
8380 | // Using our own utrace-based uprobes |
8381 | void emit_module_utrace_decls (systemtap_session& s); | |
8382 | void emit_module_utrace_init (systemtap_session& s); | |
8383 | void emit_module_utrace_exit (systemtap_session& s); | |
8384 | ||
8385 | // Using the upstream inode-based uprobes | |
8386 | void emit_module_inode_decls (systemtap_session& s); | |
8387 | void emit_module_inode_init (systemtap_session& s); | |
8388 | void emit_module_inode_exit (systemtap_session& s); | |
8389 | ||
3a894f7e JS |
8390 | // Using the dyninst backend (via stapdyn) |
8391 | void emit_module_dyninst_decls (systemtap_session& s); | |
8392 | void emit_module_dyninst_init (systemtap_session& s); | |
8393 | void emit_module_dyninst_exit (systemtap_session& s); | |
8394 | ||
935447c8 | 8395 | public: |
888af770 | 8396 | void emit_module_decls (systemtap_session& s); |
935447c8 DS |
8397 | void emit_module_init (systemtap_session& s); |
8398 | void emit_module_exit (systemtap_session& s); | |
8399 | }; | |
8400 | ||
8401 | ||
888af770 FCE |
8402 | void |
8403 | uprobe_derived_probe::join_group (systemtap_session& s) | |
8404 | { | |
8405 | if (! s.uprobe_derived_probes) | |
8406 | s.uprobe_derived_probes = new uprobe_derived_probe_group (); | |
8407 | s.uprobe_derived_probes->enroll (this); | |
f31a77f5 DS |
8408 | if (s.runtime_usermode_p()) |
8409 | enable_dynprobes(s); | |
8410 | else | |
4441e344 | 8411 | enable_task_finder(s); |
a96d1db0 | 8412 | |
8a03658e | 8413 | // Ask buildrun.cxx to build extra module if needed, and |
d3e959b0 DS |
8414 | // signal staprun to load that module. If we're using the builtin |
8415 | // inode-uprobes, we still need to know that it is required. | |
8a03658e | 8416 | s.need_uprobes = true; |
a96d1db0 DN |
8417 | } |
8418 | ||
888af770 | 8419 | |
c0f84e7b SC |
8420 | void |
8421 | uprobe_derived_probe::getargs(std::list<std::string> &arg_set) const | |
8422 | { | |
8423 | dwarf_derived_probe::getargs(arg_set); | |
8424 | arg_set.insert(arg_set.end(), args.begin(), args.end()); | |
8425 | } | |
8426 | ||
8427 | ||
8428 | void | |
8429 | uprobe_derived_probe::saveargs(int nargs) | |
8430 | { | |
8431 | for (int i = 1; i <= nargs; i++) | |
8432 | args.push_back("$arg" + lex_cast (i) + ":long"); | |
8433 | } | |
8434 | ||
8435 | ||
2865d17a | 8436 | void |
42e38653 | 8437 | uprobe_derived_probe::emit_privilege_assertion (translator_output* o) |
2865d17a DB |
8438 | { |
8439 | // These probes are allowed for unprivileged users, but only in the | |
8440 | // context of processes which they own. | |
8441 | emit_process_owner_assertion (o); | |
8442 | } | |
8443 | ||
8444 | ||
888af770 | 8445 | struct uprobe_builder: public derived_probe_builder |
a96d1db0 | 8446 | { |
888af770 | 8447 | uprobe_builder() {} |
2b69faaf | 8448 | virtual void build(systemtap_session & sess, |
a96d1db0 DN |
8449 | probe * base, |
8450 | probe_point * location, | |
86bf665e | 8451 | literal_map_t const & parameters, |
a96d1db0 DN |
8452 | vector<derived_probe *> & finished_results) |
8453 | { | |
888af770 | 8454 | int64_t process, address; |
a96d1db0 | 8455 | |
2b69faaf | 8456 | if (kernel_supports_inode_uprobes(sess)) |
dc09353a | 8457 | throw SEMANTIC_ERROR (_("absolute process probes not available [man error::inode-uprobes]")); |
2b69faaf | 8458 | |
888af770 | 8459 | bool b1 = get_param (parameters, TOK_PROCESS, process); |
ced347a9 | 8460 | (void) b1; |
888af770 | 8461 | bool b2 = get_param (parameters, TOK_STATEMENT, address); |
ced347a9 | 8462 | (void) b2; |
888af770 FCE |
8463 | bool rr = has_null_param (parameters, TOK_RETURN); |
8464 | assert (b1 && b2); // by pattern_root construction | |
a96d1db0 | 8465 | |
0973d815 | 8466 | finished_results.push_back(new uprobe_derived_probe(base, location, process, address, rr)); |
a96d1db0 DN |
8467 | } |
8468 | }; | |
8469 | ||
8470 | ||
8471 | void | |
cfcab6c7 | 8472 | uprobe_derived_probe_group::emit_module_maxuprobes (systemtap_session& s) |
a96d1db0 | 8473 | { |
43241c44 FCE |
8474 | // We'll probably need at least this many: |
8475 | unsigned minuprobes = probes.size(); | |
8476 | // .. but we don't want so many that .bss is inflated (PR10507): | |
8477 | unsigned uprobesize = 64; | |
8478 | unsigned maxuprobesmem = 10*1024*1024; // 10 MB | |
8479 | unsigned maxuprobes = maxuprobesmem / uprobesize; | |
8480 | ||
aaf7ffe8 FCE |
8481 | // Let's choose a value on the geometric middle. This should end up |
8482 | // between minuprobes and maxuprobes. It's OK if this number turns | |
8483 | // out to be < minuprobes or > maxuprobes. At worst, we get a | |
8484 | // run-time error of one kind (too few: missed uprobe registrations) | |
8485 | // or another (too many: vmalloc errors at module load time). | |
8486 | unsigned default_maxuprobes = (unsigned)sqrt((double)minuprobes * (double)maxuprobes); | |
43241c44 | 8487 | |
6d0f3f0c | 8488 | s.op->newline() << "#ifndef MAXUPROBES"; |
43241c44 | 8489 | s.op->newline() << "#define MAXUPROBES " << default_maxuprobes; |
6d0f3f0c | 8490 | s.op->newline() << "#endif"; |
cfcab6c7 JS |
8491 | } |
8492 | ||
8493 | ||
8494 | void | |
8495 | uprobe_derived_probe_group::emit_module_utrace_decls (systemtap_session& s) | |
8496 | { | |
8497 | if (probes.empty()) return; | |
8498 | s.op->newline() << "/* ---- utrace uprobes ---- */"; | |
8499 | // If uprobes isn't in the kernel, pull it in from the runtime. | |
8500 | ||
8501 | s.op->newline() << "#if defined(CONFIG_UPROBES) || defined(CONFIG_UPROBES_MODULE)"; | |
8502 | s.op->newline() << "#include <linux/uprobes.h>"; | |
8503 | s.op->newline() << "#else"; | |
2ba1736a | 8504 | s.op->newline() << "#include \"linux/uprobes/uprobes.h\""; |
cfcab6c7 JS |
8505 | s.op->newline() << "#endif"; |
8506 | s.op->newline() << "#ifndef UPROBES_API_VERSION"; | |
8507 | s.op->newline() << "#define UPROBES_API_VERSION 1"; | |
8508 | s.op->newline() << "#endif"; | |
8509 | ||
8510 | emit_module_maxuprobes (s); | |
a96d1db0 | 8511 | |
cc52276b | 8512 | // Forward decls |
2ba1736a | 8513 | s.op->newline() << "#include \"linux/uprobes-common.h\""; |
cc52276b | 8514 | |
5e112f92 FCE |
8515 | // In .bss, the shared pool of uprobe/uretprobe structs. These are |
8516 | // too big to embed in the initialized .data stap_uprobe_spec array. | |
cc52276b WC |
8517 | // XXX: consider a slab cache or somesuch for stap_uprobes |
8518 | s.op->newline() << "static struct stap_uprobe stap_uprobes [MAXUPROBES];"; | |
6b378b7c | 8519 | s.op->newline() << "static DEFINE_MUTEX(stap_uprobes_lock);"; // protects against concurrent registration/unregistration |
a96d1db0 | 8520 | |
89ba3085 FCE |
8521 | s.op->assert_0_indent(); |
8522 | ||
89ba3085 FCE |
8523 | // Assign task-finder numbers as we build up the stap_uprobe_tf table. |
8524 | // This means we process probes[] in two passes. | |
8525 | map <string,unsigned> module_index; | |
8526 | unsigned module_index_ctr = 0; | |
8527 | ||
cc52276b WC |
8528 | // not const since embedded task_finder_target struct changes |
8529 | s.op->newline() << "static struct stap_uprobe_tf stap_uprobe_finders[] = {"; | |
89ba3085 FCE |
8530 | s.op->indent(1); |
8531 | for (unsigned i=0; i<probes.size(); i++) | |
8532 | { | |
8533 | uprobe_derived_probe *p = probes[i]; | |
8534 | string pbmkey = make_pbm_key (p); | |
8535 | if (module_index.find (pbmkey) == module_index.end()) | |
8536 | { | |
8537 | module_index[pbmkey] = module_index_ctr++; | |
8538 | ||
8539 | s.op->newline() << "{"; | |
8540 | // NB: it's essential that make_pbm_key() use all of and | |
8541 | // only the same fields as we're about to emit. | |
8542 | s.op->line() << " .finder={"; | |
1af100fc | 8543 | s.op->line() << " .purpose=\"uprobes\","; |
89ba3085 | 8544 | if (p->pid != 0) |
68910c97 JK |
8545 | s.op->line() << " .pid=" << p->pid << ","; |
8546 | ||
8547 | if (p->section == "") // .statement(addr).absolute | |
8548 | s.op->line() << " .callback=&stap_uprobe_process_found,"; | |
89ba3085 FCE |
8549 | else if (p->section == ".absolute") // proxy for ET_EXEC -> exec()'d program |
8550 | { | |
8551 | s.op->line() << " .procname=" << lex_cast_qstring(p->module) << ","; | |
8552 | s.op->line() << " .callback=&stap_uprobe_process_found,"; | |
8553 | } | |
68910c97 | 8554 | else if (p->section != ".absolute") // ET_DYN |
89ba3085 | 8555 | { |
4ad95bbc SC |
8556 | if (p->has_library) |
8557 | s.op->line() << " .procname=\"" << p->path << "\", "; | |
89ba3085 FCE |
8558 | s.op->line() << " .mmap_callback=&stap_uprobe_mmap_found, "; |
8559 | s.op->line() << " .munmap_callback=&stap_uprobe_munmap_found, "; | |
19d91f6c | 8560 | s.op->line() << " .callback=&stap_uprobe_process_munmap,"; |
89ba3085 | 8561 | } |
89ba3085 | 8562 | s.op->line() << " },"; |
68910c97 JK |
8563 | if (p->module != "") |
8564 | s.op->line() << " .pathname=" << lex_cast_qstring(p->module) << ", "; | |
89ba3085 FCE |
8565 | s.op->line() << " },"; |
8566 | } | |
c57ea854 | 8567 | else |
822a6a3d | 8568 | { } // skip it in this pass, already have a suitable stap_uprobe_tf slot for it. |
89ba3085 FCE |
8569 | } |
8570 | s.op->newline(-1) << "};"; | |
8571 | ||
8572 | s.op->assert_0_indent(); | |
8573 | ||
3689db05 SC |
8574 | unsigned pci; |
8575 | for (pci=0; pci<probes.size(); pci++) | |
8576 | { | |
8577 | // List of perf counters used by each probe | |
8578 | // This list is an index into struct stap_perf_probe, | |
8579 | uprobe_derived_probe *p = probes[pci]; | |
698de6cc | 8580 | std::set<derived_probe*>::iterator pcii; |
3689db05 SC |
8581 | s.op->newline() << "long perf_counters_" + lex_cast(pci) + "[] = {"; |
8582 | for (pcii = p->perf_counter_refs.begin(); | |
8583 | pcii != p->perf_counter_refs.end(); pcii++) | |
8584 | { | |
8585 | map<string, pair<string,derived_probe*> >::iterator it; | |
8586 | unsigned i = 0; | |
8587 | // Find the associated perf.counter probe | |
8588 | for (it=s.perf_counters.begin() ; | |
8589 | it != s.perf_counters.end(); it++, i++) | |
8590 | if ((*it).second.second == (*pcii)) | |
8591 | break; | |
8592 | s.op->line() << lex_cast(i) << ", "; | |
8593 | } | |
8594 | s.op->newline() << "};"; | |
8595 | } | |
8596 | ||
cc52276b WC |
8597 | // NB: read-only structure |
8598 | s.op->newline() << "static const struct stap_uprobe_spec stap_uprobe_specs [] = {"; | |
a96d1db0 | 8599 | s.op->indent(1); |
888af770 FCE |
8600 | for (unsigned i =0; i<probes.size(); i++) |
8601 | { | |
8602 | uprobe_derived_probe* p = probes[i]; | |
8603 | s.op->newline() << "{"; | |
89ba3085 FCE |
8604 | string key = make_pbm_key (p); |
8605 | unsigned value = module_index[key]; | |
759e1d76 FCE |
8606 | if (value != 0) |
8607 | s.op->line() << " .tfi=" << value << ","; | |
6b66b9f7 | 8608 | s.op->line() << " .address=(unsigned long)0x" << hex << p->addr << dec << "ULL,"; |
faea5e16 | 8609 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
4ddb6dd0 | 8610 | |
038c38c6 | 8611 | if (p->sdt_semaphore_addr != 0) |
63b4fd14 | 8612 | s.op->line() << " .sdt_sem_offset=(unsigned long)0x" |
038c38c6 | 8613 | << hex << p->sdt_semaphore_addr << dec << "ULL,"; |
4ddb6dd0 | 8614 | |
0d049a1d | 8615 | // XXX: don't bother emit if array is empty |
3689db05 SC |
8616 | s.op->line() << " .perf_counters_dim=ARRAY_SIZE(perf_counters_" << lex_cast(i) << "),"; |
8617 | // List of perf counters used by a probe from above | |
0d049a1d | 8618 | s.op->line() << " .perf_counters=perf_counters_" + lex_cast(i) + ","; |
3689db05 | 8619 | |
4ddb6dd0 JS |
8620 | if (p->has_return) |
8621 | s.op->line() << " .return_p=1,"; | |
888af770 FCE |
8622 | s.op->line() << " },"; |
8623 | } | |
8624 | s.op->newline(-1) << "};"; | |
a96d1db0 | 8625 | |
89ba3085 FCE |
8626 | s.op->assert_0_indent(); |
8627 | ||
48e685da | 8628 | s.op->newline() << "static void enter_uprobe_probe (struct uprobe *inst, struct pt_regs *regs) {"; |
888af770 | 8629 | s.op->newline(1) << "struct stap_uprobe *sup = container_of(inst, struct stap_uprobe, up);"; |
89ba3085 | 8630 | s.op->newline() << "const struct stap_uprobe_spec *sups = &stap_uprobe_specs [sup->spec_index];"; |
71db462b | 8631 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sups->probe", |
cda141c2 | 8632 | "stp_probe_type_uprobe"); |
0e090c74 | 8633 | s.op->newline() << "if (sup->spec_index < 0 || " |
6e895029 DS |
8634 | << "sup->spec_index >= " << probes.size() << ") {"; |
8635 | s.op->newline(1) << "_stp_error (\"bad spec_index %d (max " << probes.size() | |
0e090c74 | 8636 | << "): %s\", sup->spec_index, c->probe_point);"; |
6e895029 DS |
8637 | s.op->newline() << "goto probe_epilogue;"; |
8638 | s.op->newline(-1) << "}"; | |
d9aed31e | 8639 | s.op->newline() << "c->uregs = regs;"; |
e04b5d74 | 8640 | s.op->newline() << "c->user_mode_p = 1;"; |
6415ddde MW |
8641 | |
8642 | // Make it look like the IP is set as it would in the actual user | |
8643 | // task when calling real probe handler. Reset IP regs on return, so | |
8644 | // we don't confuse uprobes. PR10458 | |
8645 | s.op->newline() << "{"; | |
8646 | s.op->indent(1); | |
d9aed31e | 8647 | s.op->newline() << "unsigned long uprobes_ip = REG_IP(c->uregs);"; |
259d54c0 | 8648 | s.op->newline() << "SET_REG_IP(regs, inst->vaddr);"; |
26e63673 | 8649 | s.op->newline() << "(*sups->probe->ph) (c);"; |
259d54c0 | 8650 | s.op->newline() << "SET_REG_IP(regs, uprobes_ip);"; |
6415ddde MW |
8651 | s.op->newline(-1) << "}"; |
8652 | ||
f887a8c9 | 8653 | common_probe_entryfn_epilogue (s, true); |
888af770 | 8654 | s.op->newline(-1) << "}"; |
a96d1db0 | 8655 | |
48e685da | 8656 | s.op->newline() << "static void enter_uretprobe_probe (struct uretprobe_instance *inst, struct pt_regs *regs) {"; |
888af770 | 8657 | s.op->newline(1) << "struct stap_uprobe *sup = container_of(inst->rp, struct stap_uprobe, urp);"; |
89ba3085 | 8658 | s.op->newline() << "const struct stap_uprobe_spec *sups = &stap_uprobe_specs [sup->spec_index];"; |
71db462b | 8659 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sups->probe", |
cda141c2 | 8660 | "stp_probe_type_uretprobe"); |
6dceb5c9 | 8661 | s.op->newline() << "c->ips.ri = inst;"; |
0e090c74 | 8662 | s.op->newline() << "if (sup->spec_index < 0 || " |
0d5561a5 DS |
8663 | << "sup->spec_index >= " << probes.size() << ") {"; |
8664 | s.op->newline(1) << "_stp_error (\"bad spec_index %d (max " << probes.size() | |
0e090c74 | 8665 | << "): %s\", sup->spec_index, c->probe_point);"; |
0d5561a5 DS |
8666 | s.op->newline() << "goto probe_epilogue;"; |
8667 | s.op->newline(-1) << "}"; | |
8668 | ||
d9aed31e | 8669 | s.op->newline() << "c->uregs = regs;"; |
e04b5d74 | 8670 | s.op->newline() << "c->user_mode_p = 1;"; |
6415ddde MW |
8671 | |
8672 | // Make it look like the IP is set as it would in the actual user | |
8673 | // task when calling real probe handler. Reset IP regs on return, so | |
8674 | // we don't confuse uprobes. PR10458 | |
8675 | s.op->newline() << "{"; | |
8676 | s.op->indent(1); | |
d9aed31e | 8677 | s.op->newline() << "unsigned long uprobes_ip = REG_IP(c->uregs);"; |
5e562a69 | 8678 | s.op->newline() << "SET_REG_IP(regs, inst->ret_addr);"; |
26e63673 | 8679 | s.op->newline() << "(*sups->probe->ph) (c);"; |
259d54c0 | 8680 | s.op->newline() << "SET_REG_IP(regs, uprobes_ip);"; |
6415ddde MW |
8681 | s.op->newline(-1) << "}"; |
8682 | ||
f887a8c9 | 8683 | common_probe_entryfn_epilogue (s, true); |
a96d1db0 DN |
8684 | s.op->newline(-1) << "}"; |
8685 | ||
89ba3085 | 8686 | s.op->newline(); |
2ba1736a | 8687 | s.op->newline() << "#include \"linux/uprobes-common.c\""; |
6d0f3f0c | 8688 | s.op->newline(); |
888af770 | 8689 | } |
935447c8 DS |
8690 | |
8691 | ||
888af770 | 8692 | void |
2b69faaf | 8693 | uprobe_derived_probe_group::emit_module_utrace_init (systemtap_session& s) |
935447c8 | 8694 | { |
888af770 | 8695 | if (probes.empty()) return; |
935447c8 | 8696 | |
2b69faaf | 8697 | s.op->newline() << "/* ---- utrace uprobes ---- */"; |
935447c8 | 8698 | |
01b05e2e | 8699 | s.op->newline() << "for (j=0; j<MAXUPROBES; j++) {"; |
5e112f92 FCE |
8700 | s.op->newline(1) << "struct stap_uprobe *sup = & stap_uprobes[j];"; |
8701 | s.op->newline() << "sup->spec_index = -1;"; // free slot | |
80b4ad8b FCE |
8702 | // NB: we assume the rest of the struct (specificaly, sup->up) is |
8703 | // initialized to zero. This is so that we can use | |
8704 | // sup->up->kdata = NULL for "really free!" PR 6829. | |
5e112f92 FCE |
8705 | s.op->newline(-1) << "}"; |
8706 | s.op->newline() << "mutex_init (& stap_uprobes_lock);"; | |
935447c8 | 8707 | |
89ba3085 FCE |
8708 | // Set up the task_finders |
8709 | s.op->newline() << "for (i=0; i<sizeof(stap_uprobe_finders)/sizeof(stap_uprobe_finders[0]); i++) {"; | |
8710 | s.op->newline(1) << "struct stap_uprobe_tf *stf = & stap_uprobe_finders[i];"; | |
c57ea854 | 8711 | s.op->newline() << "probe_point = stf->pathname;"; // for error messages; XXX: would prefer pp() or something better |
89ba3085 | 8712 | s.op->newline() << "rc = stap_register_task_finder_target (& stf->finder);"; |
935447c8 | 8713 | |
5e112f92 FCE |
8714 | // NB: if (rc), there is no need (XXX: nor any way) to clean up any |
8715 | // finders already registered, since mere registration does not | |
8716 | // cause any utrace or memory allocation actions. That happens only | |
8717 | // later, once the task finder engine starts running. So, for a | |
8718 | // partial initialization requiring unwind, we need do nothing. | |
8719 | s.op->newline() << "if (rc) break;"; | |
a7a68293 | 8720 | |
888af770 FCE |
8721 | s.op->newline(-1) << "}"; |
8722 | } | |
d0ea46ce | 8723 | |
d0a7f5a9 | 8724 | |
888af770 | 8725 | void |
2b69faaf | 8726 | uprobe_derived_probe_group::emit_module_utrace_exit (systemtap_session& s) |
888af770 FCE |
8727 | { |
8728 | if (probes.empty()) return; | |
2b69faaf | 8729 | s.op->newline() << "/* ---- utrace uprobes ---- */"; |
e56e51c9 | 8730 | |
6d0f3f0c FCE |
8731 | // NB: there is no stap_unregister_task_finder_target call; |
8732 | // important stuff like utrace cleanups are done by | |
d41d451c FCE |
8733 | // __stp_task_finder_cleanup() via stap_stop_task_finder(). |
8734 | // | |
8735 | // This function blocks until all callbacks are completed, so there | |
8736 | // is supposed to be no possibility of any registration-related code starting | |
8737 | // to run in parallel with our shutdown here. So we don't need to protect the | |
8738 | // stap_uprobes[] array with the mutex. | |
d0a7f5a9 | 8739 | |
01b05e2e | 8740 | s.op->newline() << "for (j=0; j<MAXUPROBES; j++) {"; |
5e112f92 | 8741 | s.op->newline(1) << "struct stap_uprobe *sup = & stap_uprobes[j];"; |
89ba3085 | 8742 | s.op->newline() << "const struct stap_uprobe_spec *sups = &stap_uprobe_specs [sup->spec_index];"; |
6d0f3f0c | 8743 | s.op->newline() << "if (sup->spec_index < 0) continue;"; // free slot |
3568f1dd | 8744 | |
8faa1fc5 | 8745 | // PR10655: decrement that ENABLED semaphore |
c116c31b | 8746 | s.op->newline() << "if (sup->sdt_sem_address) {"; |
8faa1fc5 FCE |
8747 | s.op->newline(1) << "unsigned short sdt_semaphore;"; // NB: fixed size |
8748 | s.op->newline() << "pid_t pid = (sups->return_p ? sup->urp.u.pid : sup->up.pid);"; | |
8749 | s.op->newline() << "struct task_struct *tsk;"; | |
8750 | s.op->newline() << "rcu_read_lock();"; | |
6846cfc8 | 8751 | |
86229a55 DS |
8752 | // Do a pid->task_struct* lookup. For 2.6.24+, this code assumes |
8753 | // that the pid is always in the global namespace, not in any | |
8754 | // private namespace. | |
8faa1fc5 | 8755 | s.op->newline() << "#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)"; |
86229a55 DS |
8756 | // We'd like to call find_task_by_pid_ns() here, but it isn't |
8757 | // exported. So, we call what it calls... | |
8758 | s.op->newline() << " tsk = pid_task(find_pid_ns(pid, &init_pid_ns), PIDTYPE_PID);"; | |
8faa1fc5 FCE |
8759 | s.op->newline() << "#else"; |
8760 | s.op->newline() << " tsk = find_task_by_pid (pid);"; | |
8761 | s.op->newline() << "#endif /* 2.6.24 */"; | |
8faa1fc5 FCE |
8762 | |
8763 | s.op->newline() << "if (tsk) {"; // just in case the thing exited while we weren't watching | |
3c5b8e2b | 8764 | s.op->newline(1) << "if (__access_process_vm_noflush(tsk, sup->sdt_sem_address, &sdt_semaphore, sizeof(sdt_semaphore), 0)) {"; |
63b4fd14 | 8765 | s.op->newline(1) << "sdt_semaphore --;"; |
903b9fcd | 8766 | s.op->newline() << "#ifdef DEBUG_UPROBES"; |
c116c31b | 8767 | s.op->newline() << "_stp_dbug (__FUNCTION__,__LINE__, \"-semaphore %#x @ %#lx\\n\", sdt_semaphore, sup->sdt_sem_address);"; |
903b9fcd | 8768 | s.op->newline() << "#endif"; |
3c5b8e2b | 8769 | s.op->newline() << "__access_process_vm_noflush(tsk, sup->sdt_sem_address, &sdt_semaphore, sizeof(sdt_semaphore), 1);"; |
93c84191 | 8770 | s.op->newline(-1) << "}"; |
8faa1fc5 FCE |
8771 | // XXX: need to analyze possibility of race condition |
8772 | s.op->newline(-1) << "}"; | |
8773 | s.op->newline() << "rcu_read_unlock();"; | |
8774 | s.op->newline(-1) << "}"; | |
6846cfc8 | 8775 | |
3568f1dd FCE |
8776 | s.op->newline() << "if (sups->return_p) {"; |
8777 | s.op->newline(1) << "#ifdef DEBUG_UPROBES"; | |
89ba3085 | 8778 | s.op->newline() << "_stp_dbug (__FUNCTION__,__LINE__, \"-uretprobe spec %d index %d pid %d addr %p\\n\", sup->spec_index, j, sup->up.pid, (void*) sup->up.vaddr);"; |
3568f1dd | 8779 | s.op->newline() << "#endif"; |
80b4ad8b FCE |
8780 | // NB: PR6829 does not change that we still need to unregister at |
8781 | // *this* time -- when the script as a whole exits. | |
3568f1dd FCE |
8782 | s.op->newline() << "unregister_uretprobe (& sup->urp);"; |
8783 | s.op->newline(-1) << "} else {"; | |
8784 | s.op->newline(1) << "#ifdef DEBUG_UPROBES"; | |
8faa1fc5 | 8785 | s.op->newline() << "_stp_dbug (__FUNCTION__,__LINE__, \"-uprobe spec %d index %d pid %d addr %p\\n\", sup->spec_index, j, sup->up.pid, (void*) sup->up.vaddr);"; |
3568f1dd FCE |
8786 | s.op->newline() << "#endif"; |
8787 | s.op->newline() << "unregister_uprobe (& sup->up);"; | |
8788 | s.op->newline(-1) << "}"; | |
935447c8 | 8789 | |
6d0f3f0c | 8790 | s.op->newline() << "sup->spec_index = -1;"; |
935447c8 | 8791 | |
3568f1dd FCE |
8792 | // XXX: uprobe missed counts? |
8793 | ||
6d0f3f0c | 8794 | s.op->newline(-1) << "}"; |
935447c8 | 8795 | |
5e112f92 | 8796 | s.op->newline() << "mutex_destroy (& stap_uprobes_lock);"; |
935447c8 DS |
8797 | } |
8798 | ||
2b69faaf JS |
8799 | |
8800 | void | |
8801 | uprobe_derived_probe_group::emit_module_inode_decls (systemtap_session& s) | |
8802 | { | |
8803 | if (probes.empty()) return; | |
8804 | s.op->newline() << "/* ---- inode uprobes ---- */"; | |
cfcab6c7 | 8805 | emit_module_maxuprobes (s); |
2ba1736a | 8806 | s.op->newline() << "#include \"linux/uprobes-inode.c\""; |
2b69faaf JS |
8807 | |
8808 | // Write the probe handler. | |
79af55c3 JS |
8809 | s.op->newline() << "static int stapiu_probe_handler " |
8810 | << "(struct stapiu_consumer *sup, struct pt_regs *regs) {"; | |
8811 | s.op->newline(1); | |
2dbbd473 JS |
8812 | |
8813 | // Since we're sharing the entry function, we have to dynamically choose the probe_type | |
8814 | string probe_type = "(sup->return_p ? stp_probe_type_uretprobe : stp_probe_type_uprobe)"; | |
71db462b | 8815 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sup->probe", |
2dbbd473 JS |
8816 | probe_type); |
8817 | ||
3bff6634 | 8818 | s.op->newline() << "c->uregs = regs;"; |
e04b5d74 | 8819 | s.op->newline() << "c->user_mode_p = 1;"; |
497cfcb2 | 8820 | // NB: IP is already set by stapiu_probe_prehandler in uprobes-inode.c |
2b69faaf | 8821 | s.op->newline() << "(*sup->probe->ph) (c);"; |
39e63bae | 8822 | |
f887a8c9 | 8823 | common_probe_entryfn_epilogue (s, true); |
2b69faaf JS |
8824 | s.op->newline() << "return 0;"; |
8825 | s.op->newline(-1) << "}"; | |
8826 | s.op->assert_0_indent(); | |
8827 | ||
8828 | // Index of all the modules for which we need inodes. | |
8829 | map<string, unsigned> module_index; | |
8830 | unsigned module_index_ctr = 0; | |
8831 | ||
8832 | // Discover and declare targets for each unique path. | |
cfcab6c7 | 8833 | s.op->newline() << "static struct stapiu_target " |
2b69faaf JS |
8834 | << "stap_inode_uprobe_targets[] = {"; |
8835 | s.op->indent(1); | |
8836 | for (unsigned i=0; i<probes.size(); i++) | |
8837 | { | |
8838 | uprobe_derived_probe *p = probes[i]; | |
cfcab6c7 JS |
8839 | const string key = make_pbm_key(p); |
8840 | if (module_index.find (key) == module_index.end()) | |
2b69faaf | 8841 | { |
cfcab6c7 JS |
8842 | module_index[key] = module_index_ctr++; |
8843 | s.op->newline() << "{"; | |
8844 | s.op->line() << " .finder={"; | |
b78a0fbb | 8845 | s.op->line() << " .purpose=\"inode-uprobes\","; |
cfcab6c7 JS |
8846 | if (p->pid != 0) |
8847 | s.op->line() << " .pid=" << p->pid << ","; | |
8848 | ||
8849 | if (p->section == "") // .statement(addr).absolute XXX? | |
8850 | s.op->line() << " .callback=&stapiu_process_found,"; | |
8851 | else if (p->section == ".absolute") // proxy for ET_EXEC -> exec()'d program | |
8852 | { | |
8853 | s.op->line() << " .procname=" << lex_cast_qstring(p->module) << ","; | |
8854 | s.op->line() << " .callback=&stapiu_process_found,"; | |
8855 | } | |
8856 | else if (p->section != ".absolute") // ET_DYN | |
8857 | { | |
8858 | if (p->has_library) | |
8859 | s.op->line() << " .procname=\"" << p->path << "\", "; | |
8860 | s.op->line() << " .mmap_callback=&stapiu_mmap_found, "; | |
8861 | s.op->line() << " .munmap_callback=&stapiu_munmap_found, "; | |
8862 | s.op->line() << " .callback=&stapiu_process_munmap,"; | |
8863 | } | |
8864 | s.op->line() << " },"; | |
8865 | s.op->line() << " .filename=" << lex_cast_qstring(p->module) << ","; | |
8866 | s.op->line() << " },"; | |
2b69faaf JS |
8867 | } |
8868 | } | |
8869 | s.op->newline(-1) << "};"; | |
8870 | s.op->assert_0_indent(); | |
8871 | ||
8872 | // Declare the actual probes. | |
3689db05 SC |
8873 | unsigned pci; |
8874 | for (pci=0; pci<probes.size(); pci++) | |
8875 | { | |
8876 | // List of perf counters used by each probe | |
8877 | // This list is an index into struct stap_perf_probe, | |
8878 | uprobe_derived_probe *p = probes[pci]; | |
698de6cc | 8879 | std::set<derived_probe*>::iterator pcii; |
3689db05 SC |
8880 | s.op->newline() << "long perf_counters_" + lex_cast(pci) + "[] = {"; |
8881 | for (pcii = p->perf_counter_refs.begin(); | |
8882 | pcii != p->perf_counter_refs.end(); pcii++) | |
8883 | { | |
8884 | map<string, pair<string,derived_probe*> >::iterator it; | |
8885 | unsigned i = 0; | |
8886 | // Find the associated perf.counter probe | |
4fa83377 SC |
8887 | for (it=s.perf_counters.begin() ; |
8888 | it != s.perf_counters.end(); it++, i++) | |
3689db05 SC |
8889 | if ((*it).second.second == (*pcii)) |
8890 | break; | |
8891 | s.op->line() << lex_cast(i) << ", "; | |
8892 | } | |
8893 | s.op->newline() << "};"; | |
8894 | } | |
8895 | ||
cfcab6c7 | 8896 | s.op->newline() << "static struct stapiu_consumer " |
2b69faaf JS |
8897 | << "stap_inode_uprobe_consumers[] = {"; |
8898 | s.op->indent(1); | |
8899 | for (unsigned i=0; i<probes.size(); i++) | |
8900 | { | |
8901 | uprobe_derived_probe *p = probes[i]; | |
cfcab6c7 JS |
8902 | unsigned index = module_index[make_pbm_key(p)]; |
8903 | s.op->newline() << "{"; | |
79af55c3 JS |
8904 | if (p->has_return) |
8905 | s.op->line() << " .return_p=1,"; | |
cfcab6c7 JS |
8906 | s.op->line() << " .target=&stap_inode_uprobe_targets[" << index << "],"; |
8907 | s.op->line() << " .offset=(loff_t)0x" << hex << p->addr << dec << "ULL,"; | |
8908 | if (p->sdt_semaphore_addr) | |
8909 | s.op->line() << " .sdt_sem_offset=(loff_t)0x" | |
8910 | << hex << p->sdt_semaphore_addr << dec << "ULL,"; | |
0d049a1d | 8911 | // XXX: don't bother emit if array is empty |
3689db05 SC |
8912 | s.op->line() << " .perf_counters_dim=ARRAY_SIZE(perf_counters_" << lex_cast(i) << "),"; |
8913 | // List of perf counters used by a probe from above | |
0d049a1d | 8914 | s.op->line() << " .perf_counters=perf_counters_" + lex_cast(i) + ","; |
cfcab6c7 JS |
8915 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
8916 | s.op->line() << " },"; | |
2b69faaf JS |
8917 | } |
8918 | s.op->newline(-1) << "};"; | |
8919 | s.op->assert_0_indent(); | |
8920 | } | |
8921 | ||
8922 | ||
8923 | void | |
8924 | uprobe_derived_probe_group::emit_module_inode_init (systemtap_session& s) | |
8925 | { | |
8926 | if (probes.empty()) return; | |
8927 | s.op->newline() << "/* ---- inode uprobes ---- */"; | |
b0f614a0 DS |
8928 | // Let stapiu_init() handle reporting errors by setting probe_point |
8929 | // to NULL. | |
8930 | s.op->newline() << "probe_point = NULL;"; | |
cfcab6c7 | 8931 | s.op->newline() << "rc = stapiu_init (" |
2b69faaf JS |
8932 | << "stap_inode_uprobe_targets, " |
8933 | << "ARRAY_SIZE(stap_inode_uprobe_targets), " | |
8934 | << "stap_inode_uprobe_consumers, " | |
8935 | << "ARRAY_SIZE(stap_inode_uprobe_consumers));"; | |
8936 | } | |
8937 | ||
8938 | ||
8939 | void | |
8940 | uprobe_derived_probe_group::emit_module_inode_exit (systemtap_session& s) | |
8941 | { | |
8942 | if (probes.empty()) return; | |
8943 | s.op->newline() << "/* ---- inode uprobes ---- */"; | |
cfcab6c7 | 8944 | s.op->newline() << "stapiu_exit (" |
2b69faaf JS |
8945 | << "stap_inode_uprobe_targets, " |
8946 | << "ARRAY_SIZE(stap_inode_uprobe_targets), " | |
8947 | << "stap_inode_uprobe_consumers, " | |
8948 | << "ARRAY_SIZE(stap_inode_uprobe_consumers));"; | |
8949 | } | |
8950 | ||
8951 | ||
3a894f7e JS |
8952 | void |
8953 | uprobe_derived_probe_group::emit_module_dyninst_decls (systemtap_session& s) | |
8954 | { | |
8955 | if (probes.empty()) return; | |
8956 | s.op->newline() << "/* ---- dyninst uprobes ---- */"; | |
8957 | emit_module_maxuprobes (s); | |
e00f3fb7 | 8958 | s.op->newline() << "#include \"dyninst/uprobes.h\""; |
3a894f7e | 8959 | |
f31a77f5 DS |
8960 | // Let the dynprobe_derived_probe_group handle outputting targets |
8961 | // and probes. This allows us to merge different types of probes. | |
8962 | s.op->newline() << "static struct stapdu_probe stapdu_probes[];"; | |
8963 | for (unsigned i = 0; i < probes.size(); i++) | |
3a894f7e JS |
8964 | { |
8965 | uprobe_derived_probe *p = probes[i]; | |
e00f3fb7 | 8966 | |
f31a77f5 DS |
8967 | dynprobe_add_uprobe(s, p->module, p->addr, p->sdt_semaphore_addr, |
8968 | (p->has_return ? "STAPDYN_PROBE_FLAG_RETURN" : "0"), | |
8969 | common_probe_init(p)); | |
3a894f7e | 8970 | } |
874d38bf JS |
8971 | // loc2c-generated code assumes pt_regs are available, so use this to make |
8972 | // sure we always have *something* for it to dereference... | |
f31a77f5 | 8973 | s.op->newline() << "static struct pt_regs stapdu_dummy_uregs;"; |
e00f3fb7 | 8974 | |
3a894f7e JS |
8975 | // Write the probe handler. |
8976 | // NB: not static, so dyninst can find it | |
8977 | s.op->newline() << "int enter_dyninst_uprobe " | |
8978 | << "(uint64_t index, struct pt_regs *regs) {"; | |
e00f3fb7 | 8979 | s.op->newline(1) << "struct stapdu_probe *sup = &stapdu_probes[index];"; |
92b97104 JS |
8980 | |
8981 | // Since we're sharing the entry function, we have to dynamically choose the probe_type | |
8982 | string probe_type = "((sup->flags & STAPDYN_PROBE_FLAG_RETURN) ?" | |
8983 | " stp_probe_type_uretprobe : stp_probe_type_uprobe)"; | |
71db462b | 8984 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sup->probe", |
92b97104 JS |
8985 | probe_type); |
8986 | ||
874d38bf | 8987 | s.op->newline() << "c->uregs = regs ?: &stapdu_dummy_uregs;"; |
e04b5d74 | 8988 | s.op->newline() << "c->user_mode_p = 1;"; |
3a894f7e JS |
8989 | // XXX: once we have regs, check how dyninst sets the IP |
8990 | // XXX: the way that dyninst rewrites stuff is probably going to be | |
8991 | // ... very confusing to our backtracer (at least if we stay in process) | |
8992 | s.op->newline() << "(*sup->probe->ph) (c);"; | |
f887a8c9 | 8993 | common_probe_entryfn_epilogue (s, true); |
3a894f7e JS |
8994 | s.op->newline() << "return 0;"; |
8995 | s.op->newline(-1) << "}"; | |
3debb935 | 8996 | s.op->newline() << "#include \"dyninst/uprobes-regs.c\""; |
3a894f7e JS |
8997 | s.op->assert_0_indent(); |
8998 | } | |
8999 | ||
9000 | ||
9001 | void | |
9002 | uprobe_derived_probe_group::emit_module_dyninst_init (systemtap_session& s) | |
9003 | { | |
9004 | if (probes.empty()) return; | |
9005 | ||
9006 | /* stapdyn handles the dirty work via dyninst */ | |
9007 | s.op->newline() << "/* ---- dyninst uprobes ---- */"; | |
9008 | s.op->newline() << "/* this section left intentionally blank */"; | |
9009 | } | |
9010 | ||
9011 | ||
9012 | void | |
9013 | uprobe_derived_probe_group::emit_module_dyninst_exit (systemtap_session& s) | |
9014 | { | |
9015 | if (probes.empty()) return; | |
9016 | ||
9017 | /* stapdyn handles the dirty work via dyninst */ | |
9018 | s.op->newline() << "/* ---- dyninst uprobes ---- */"; | |
9019 | s.op->newline() << "/* this section left intentionally blank */"; | |
9020 | } | |
9021 | ||
9022 | ||
2b69faaf JS |
9023 | void |
9024 | uprobe_derived_probe_group::emit_module_decls (systemtap_session& s) | |
9025 | { | |
ac3af990 | 9026 | if (s.runtime_usermode_p()) |
4441e344 JS |
9027 | emit_module_dyninst_decls (s); |
9028 | else if (kernel_supports_inode_uprobes (s)) | |
2b69faaf JS |
9029 | emit_module_inode_decls (s); |
9030 | else | |
9031 | emit_module_utrace_decls (s); | |
9032 | } | |
9033 | ||
9034 | ||
9035 | void | |
9036 | uprobe_derived_probe_group::emit_module_init (systemtap_session& s) | |
9037 | { | |
ac3af990 | 9038 | if (s.runtime_usermode_p()) |
4441e344 JS |
9039 | emit_module_dyninst_init (s); |
9040 | else if (kernel_supports_inode_uprobes (s)) | |
2b69faaf JS |
9041 | emit_module_inode_init (s); |
9042 | else | |
9043 | emit_module_utrace_init (s); | |
9044 | } | |
9045 | ||
9046 | ||
9047 | void | |
9048 | uprobe_derived_probe_group::emit_module_exit (systemtap_session& s) | |
9049 | { | |
ac3af990 | 9050 | if (s.runtime_usermode_p()) |
4441e344 JS |
9051 | emit_module_dyninst_exit (s); |
9052 | else if (kernel_supports_inode_uprobes (s)) | |
2b69faaf JS |
9053 | emit_module_inode_exit (s); |
9054 | else | |
9055 | emit_module_utrace_exit (s); | |
9056 | } | |
9057 | ||
9058 | ||
e6fe60e7 AM |
9059 | // ------------------------------------------------------------------------ |
9060 | // Kprobe derived probes | |
9061 | // ------------------------------------------------------------------------ | |
9062 | ||
4627ed58 | 9063 | static const string TOK_KPROBE("kprobe"); |
935447c8 | 9064 | |
bae55db9 | 9065 | struct kprobe_derived_probe: public derived_probe |
d0ea46ce | 9066 | { |
23dc94f6 DS |
9067 | kprobe_derived_probe (systemtap_session& sess, |
9068 | vector<derived_probe *> & results, | |
9069 | probe *base, | |
bae55db9 JS |
9070 | probe_point *location, |
9071 | const string& name, | |
9072 | int64_t stmt_addr, | |
e6afb07b | 9073 | bool has_call, |
bae55db9 JS |
9074 | bool has_return, |
9075 | bool has_statement, | |
9076 | bool has_maxactive, | |
b642c901 SC |
9077 | bool has_path, |
9078 | bool has_library, | |
9079 | long maxactive_val, | |
9080 | const string& path, | |
9081 | const string& library | |
bae55db9 JS |
9082 | ); |
9083 | string symbol_name; | |
9084 | Dwarf_Addr addr; | |
e6afb07b | 9085 | bool has_call; |
bae55db9 JS |
9086 | bool has_return; |
9087 | bool has_statement; | |
9088 | bool has_maxactive; | |
b642c901 SC |
9089 | bool has_path; |
9090 | bool has_library; | |
bae55db9 | 9091 | long maxactive_val; |
b642c901 SC |
9092 | string path; |
9093 | string library; | |
bae55db9 JS |
9094 | bool access_var; |
9095 | void printsig (std::ostream &o) const; | |
9096 | void join_group (systemtap_session& s); | |
9097 | }; | |
d0ea46ce | 9098 | |
bae55db9 JS |
9099 | struct kprobe_derived_probe_group: public derived_probe_group |
9100 | { | |
9101 | private: | |
9102 | multimap<string,kprobe_derived_probe*> probes_by_module; | |
9103 | typedef multimap<string,kprobe_derived_probe*>::iterator p_b_m_iterator; | |
d0ea46ce | 9104 | |
bae55db9 JS |
9105 | public: |
9106 | void enroll (kprobe_derived_probe* probe); | |
9107 | void emit_module_decls (systemtap_session& s); | |
9108 | void emit_module_init (systemtap_session& s); | |
9109 | void emit_module_exit (systemtap_session& s); | |
9110 | }; | |
d0ea46ce | 9111 | |
23dc94f6 DS |
9112 | struct kprobe_var_expanding_visitor: public var_expanding_visitor |
9113 | { | |
9114 | systemtap_session& sess; | |
9115 | block *add_block; | |
9116 | block *add_call_probe; // synthesized from .return probes with saved $vars | |
9117 | bool add_block_tid, add_call_probe_tid; | |
bd5b25e1 | 9118 | bool has_return; |
23dc94f6 | 9119 | |
bd5b25e1 | 9120 | kprobe_var_expanding_visitor(systemtap_session& sess, bool has_return): |
23dc94f6 | 9121 | sess(sess), add_block(NULL), add_call_probe(NULL), |
bd5b25e1 JS |
9122 | add_block_tid(false), add_call_probe_tid(false), |
9123 | has_return(has_return) {} | |
23dc94f6 DS |
9124 | |
9125 | void visit_entry_op (entry_op* e); | |
9126 | }; | |
9127 | ||
9128 | ||
9129 | kprobe_derived_probe::kprobe_derived_probe (systemtap_session& sess, | |
9130 | vector<derived_probe *> & results, | |
9131 | probe *base, | |
e6fe60e7 | 9132 | probe_point *location, |
b6371390 | 9133 | const string& name, |
e6fe60e7 | 9134 | int64_t stmt_addr, |
e6afb07b | 9135 | bool has_call, |
b6371390 JS |
9136 | bool has_return, |
9137 | bool has_statement, | |
9138 | bool has_maxactive, | |
b642c901 SC |
9139 | bool has_path, |
9140 | bool has_library, | |
9141 | long maxactive_val, | |
9142 | const string& path, | |
9143 | const string& library | |
b6371390 | 9144 | ): |
4c5d1300 | 9145 | derived_probe (base, location, true /* .components soon rewritten */ ), |
e6afb07b | 9146 | symbol_name (name), addr (stmt_addr), has_call (has_call), |
b6371390 | 9147 | has_return (has_return), has_statement (has_statement), |
b642c901 SC |
9148 | has_maxactive (has_maxactive), has_path (has_path), |
9149 | has_library (has_library), | |
9150 | maxactive_val (maxactive_val), | |
9151 | path (path), library (library) | |
e6fe60e7 AM |
9152 | { |
9153 | this->tok = base->tok; | |
9154 | this->access_var = false; | |
d0ea46ce | 9155 | |
e6fe60e7 AM |
9156 | #ifndef USHRT_MAX |
9157 | #define USHRT_MAX 32767 | |
9158 | #endif | |
d0ea46ce | 9159 | |
46856d8d JS |
9160 | // Expansion of $target variables in the probe body produces an error during |
9161 | // translate phase, since we're not using debuginfo | |
d0ea46ce | 9162 | |
e6fe60e7 | 9163 | vector<probe_point::component*> comps; |
46856d8d | 9164 | comps.push_back (new probe_point::component(TOK_KPROBE)); |
e6fe60e7 | 9165 | |
46856d8d JS |
9166 | if (has_statement) |
9167 | { | |
9ea68eb9 JS |
9168 | comps.push_back (new probe_point::component(TOK_STATEMENT, |
9169 | new literal_number(addr, true))); | |
46856d8d JS |
9170 | comps.push_back (new probe_point::component(TOK_ABSOLUTE)); |
9171 | } | |
9172 | else | |
9173 | { | |
9174 | size_t pos = name.find(':'); | |
9175 | if (pos != string::npos) | |
d0ea46ce | 9176 | { |
46856d8d JS |
9177 | string module = name.substr(0, pos); |
9178 | string function = name.substr(pos + 1); | |
9179 | comps.push_back (new probe_point::component(TOK_MODULE, new literal_string(module))); | |
9180 | comps.push_back (new probe_point::component(TOK_FUNCTION, new literal_string(function))); | |
9181 | } | |
9182 | else | |
9183 | comps.push_back (new probe_point::component(TOK_FUNCTION, new literal_string(name))); | |
46856d8d | 9184 | } |
d0ea46ce | 9185 | |
e6afb07b JL |
9186 | if (has_call) |
9187 | comps.push_back (new probe_point::component(TOK_CALL)); | |
b6371390 JS |
9188 | if (has_return) |
9189 | comps.push_back (new probe_point::component(TOK_RETURN)); | |
9190 | if (has_maxactive) | |
9191 | comps.push_back (new probe_point::component(TOK_MAXACTIVE, new literal_number(maxactive_val))); | |
d0ea46ce | 9192 | |
bd5b25e1 | 9193 | kprobe_var_expanding_visitor v (sess, has_return); |
23dc94f6 DS |
9194 | v.replace (this->body); |
9195 | ||
9196 | // If during target-variable-expanding the probe, we added a new block | |
9197 | // of code, add it to the start of the probe. | |
9198 | if (v.add_block) | |
9199 | this->body = new block(v.add_block, this->body); | |
9200 | ||
9201 | // If when target-variable-expanding the probe, we need to | |
9202 | // synthesize a sibling function-entry probe. We don't go through | |
9203 | // the whole probe derivation business (PR10642) that could lead to | |
9204 | // wildcard/alias resolution, or for that dwarf-induced duplication. | |
9205 | if (v.add_call_probe) | |
9206 | { | |
9207 | assert (has_return); | |
9208 | ||
9209 | // We temporarily replace base. | |
9210 | statement* old_body = base->body; | |
9211 | base->body = v.add_call_probe; | |
9212 | ||
9213 | derived_probe *entry_handler | |
9214 | = new kprobe_derived_probe (sess, results, base, location, name, 0, | |
e6afb07b JL |
9215 | true /* has_call */, false /* has_return */, |
9216 | has_statement, has_maxactive, has_path, | |
9217 | has_library, maxactive_val, path, library); | |
23dc94f6 DS |
9218 | results.push_back (entry_handler); |
9219 | ||
9220 | base->body = old_body; | |
9221 | } | |
9222 | ||
e6fe60e7 AM |
9223 | this->sole_location()->components = comps; |
9224 | } | |
d0ea46ce | 9225 | |
e6fe60e7 AM |
9226 | void kprobe_derived_probe::printsig (ostream& o) const |
9227 | { | |
9228 | sole_location()->print (o); | |
9229 | o << " /* " << " name = " << symbol_name << "*/"; | |
9230 | printsig_nested (o); | |
9231 | } | |
d0ea46ce | 9232 | |
e6fe60e7 AM |
9233 | void kprobe_derived_probe::join_group (systemtap_session& s) |
9234 | { | |
d0ea46ce | 9235 | |
e6fe60e7 AM |
9236 | if (! s.kprobe_derived_probes) |
9237 | s.kprobe_derived_probes = new kprobe_derived_probe_group (); | |
9238 | s.kprobe_derived_probes->enroll (this); | |
d0ea46ce | 9239 | |
e6fe60e7 | 9240 | } |
d0ea46ce | 9241 | |
e6fe60e7 AM |
9242 | void kprobe_derived_probe_group::enroll (kprobe_derived_probe* p) |
9243 | { | |
9244 | probes_by_module.insert (make_pair (p->symbol_name, p)); | |
9245 | // probes of same symbol should share single kprobe/kretprobe | |
9246 | } | |
d0ea46ce | 9247 | |
e6fe60e7 AM |
9248 | void |
9249 | kprobe_derived_probe_group::emit_module_decls (systemtap_session& s) | |
9250 | { | |
9251 | if (probes_by_module.empty()) return; | |
d0ea46ce | 9252 | |
e6fe60e7 | 9253 | s.op->newline() << "/* ---- kprobe-based probes ---- */"; |
d0ea46ce | 9254 | |
e6fe60e7 AM |
9255 | // Warn of misconfigured kernels |
9256 | s.op->newline() << "#if ! defined(CONFIG_KPROBES)"; | |
9257 | s.op->newline() << "#error \"Need CONFIG_KPROBES!\""; | |
9258 | s.op->newline() << "#endif"; | |
9259 | s.op->newline(); | |
d0ea46ce | 9260 | |
f07c3b68 | 9261 | s.op->newline() << "#ifndef KRETACTIVE"; |
1ee6b5fc | 9262 | s.op->newline() << "#define KRETACTIVE (max(15,6*(int)num_possible_cpus()))"; |
f07c3b68 FCE |
9263 | s.op->newline() << "#endif"; |
9264 | ||
e6fe60e7 | 9265 | // Forward declare the master entry functions |
88747011 | 9266 | s.op->newline() << "static int enter_kprobe2_probe (struct kprobe *inst,"; |
e6fe60e7 | 9267 | s.op->line() << " struct pt_regs *regs);"; |
88747011 | 9268 | s.op->newline() << "static int enter_kretprobe2_probe (struct kretprobe_instance *inst,"; |
e6fe60e7 | 9269 | s.op->line() << " struct pt_regs *regs);"; |
d0ea46ce | 9270 | |
e6fe60e7 AM |
9271 | // Emit an array of kprobe/kretprobe pointers |
9272 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
c9116e99 | 9273 | s.op->newline() << "static void * stap_unreg_kprobes2[" << probes_by_module.size() << "];"; |
e6fe60e7 | 9274 | s.op->newline() << "#endif"; |
d0ea46ce | 9275 | |
e6fe60e7 | 9276 | // Emit the actual probe list. |
d0ea46ce | 9277 | |
e6fe60e7 AM |
9278 | s.op->newline() << "static struct stap_dwarfless_kprobe {"; |
9279 | s.op->newline(1) << "union { struct kprobe kp; struct kretprobe krp; } u;"; | |
9280 | s.op->newline() << "#ifdef __ia64__"; | |
9281 | s.op->newline() << "struct kprobe dummy;"; | |
9282 | s.op->newline() << "#endif"; | |
9283 | s.op->newline(-1) << "} stap_dwarfless_kprobes[" << probes_by_module.size() << "];"; | |
9284 | // NB: bss! | |
d0ea46ce | 9285 | |
e6fe60e7 AM |
9286 | s.op->newline() << "static struct stap_dwarfless_probe {"; |
9287 | s.op->newline(1) << "const unsigned return_p:1;"; | |
9288 | s.op->newline() << "const unsigned maxactive_p:1;"; | |
b350f56b | 9289 | s.op->newline() << "const unsigned optional_p:1;"; |
e6fe60e7 AM |
9290 | s.op->newline() << "unsigned registered_p:1;"; |
9291 | s.op->newline() << "const unsigned short maxactive_val;"; | |
935447c8 | 9292 | |
e6fe60e7 AM |
9293 | // Function Names are mostly small and uniform enough to justify putting |
9294 | // char[MAX]'s into the array instead of relocated char*'s. | |
935447c8 | 9295 | |
faea5e16 JS |
9296 | size_t symbol_string_name_max = 0; |
9297 | size_t symbol_string_name_tot = 0; | |
e6fe60e7 | 9298 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) |
6270adc1 | 9299 | { |
e6fe60e7 AM |
9300 | kprobe_derived_probe* p = it->second; |
9301 | #define DOIT(var,expr) do { \ | |
9302 | size_t var##_size = (expr) + 1; \ | |
9303 | var##_max = max (var##_max, var##_size); \ | |
9304 | var##_tot += var##_size; } while (0) | |
e6fe60e7 AM |
9305 | DOIT(symbol_string_name, p->symbol_name.size()); |
9306 | #undef DOIT | |
6270adc1 MH |
9307 | } |
9308 | ||
e6fe60e7 AM |
9309 | #define CALCIT(var) \ |
9310 | s.op->newline() << "const char " << #var << "[" << var##_name_max << "] ;"; | |
935447c8 | 9311 | |
e6fe60e7 AM |
9312 | CALCIT(symbol_string); |
9313 | #undef CALCIT | |
6270adc1 | 9314 | |
bd659351 | 9315 | s.op->newline() << "unsigned long address;"; |
7c3e97f4 | 9316 | s.op->newline() << "const struct stap_probe * const probe;"; |
e6fe60e7 AM |
9317 | s.op->newline(-1) << "} stap_dwarfless_probes[] = {"; |
9318 | s.op->indent(1); | |
6270adc1 | 9319 | |
e6fe60e7 AM |
9320 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) |
9321 | { | |
9322 | kprobe_derived_probe* p = it->second; | |
9323 | s.op->newline() << "{"; | |
9324 | if (p->has_return) | |
9325 | s.op->line() << " .return_p=1,"; | |
6270adc1 | 9326 | |
e6fe60e7 AM |
9327 | if (p->has_maxactive) |
9328 | { | |
9329 | s.op->line() << " .maxactive_p=1,"; | |
9330 | assert (p->maxactive_val >= 0 && p->maxactive_val <= USHRT_MAX); | |
9331 | s.op->line() << " .maxactive_val=" << p->maxactive_val << ","; | |
9332 | } | |
6270adc1 | 9333 | |
b350f56b JS |
9334 | if (p->locations[0]->optional) |
9335 | s.op->line() << " .optional_p=1,"; | |
9336 | ||
e6fe60e7 | 9337 | if (p->has_statement) |
c8d9d15e | 9338 | s.op->line() << " .address=(unsigned long)0x" << hex << p->addr << dec << "ULL,"; |
e6fe60e7 | 9339 | else |
c8d9d15e | 9340 | s.op->line() << " .symbol_string=\"" << p->symbol_name << "\","; |
5d67b47c | 9341 | |
faea5e16 | 9342 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
e6fe60e7 | 9343 | s.op->line() << " },"; |
935447c8 DS |
9344 | } |
9345 | ||
e6fe60e7 | 9346 | s.op->newline(-1) << "};"; |
5d67b47c | 9347 | |
e6fe60e7 AM |
9348 | // Emit the kprobes callback function |
9349 | s.op->newline(); | |
88747011 | 9350 | s.op->newline() << "static int enter_kprobe2_probe (struct kprobe *inst,"; |
e6fe60e7 AM |
9351 | s.op->line() << " struct pt_regs *regs) {"; |
9352 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS | |
9353 | s.op->newline(1) << "int kprobe_idx = ((uintptr_t)inst-(uintptr_t)stap_dwarfless_kprobes)/sizeof(struct stap_dwarfless_kprobe);"; | |
9354 | // Check that the index is plausible | |
9355 | s.op->newline() << "struct stap_dwarfless_probe *sdp = &stap_dwarfless_probes["; | |
9356 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
9357 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
9358 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
9359 | s.op->line() << "];"; | |
71db462b | 9360 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sdp->probe", |
cda141c2 | 9361 | "stp_probe_type_kprobe"); |
d9aed31e | 9362 | s.op->newline() << "c->kregs = regs;"; |
6415ddde MW |
9363 | |
9364 | // Make it look like the IP is set as it wouldn't have been replaced | |
9365 | // by a breakpoint instruction when calling real probe handler. Reset | |
9366 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
9367 | s.op->newline() << "{"; | |
9368 | s.op->indent(1); | |
d9aed31e | 9369 | s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
259d54c0 | 9370 | s.op->newline() << "SET_REG_IP(regs, (unsigned long) inst->addr);"; |
26e63673 | 9371 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
259d54c0 | 9372 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
9373 | s.op->newline(-1) << "}"; |
9374 | ||
f887a8c9 | 9375 | common_probe_entryfn_epilogue (s, true); |
e6fe60e7 AM |
9376 | s.op->newline() << "return 0;"; |
9377 | s.op->newline(-1) << "}"; | |
935447c8 | 9378 | |
e6fe60e7 AM |
9379 | // Same for kretprobes |
9380 | s.op->newline(); | |
88747011 | 9381 | s.op->newline() << "static int enter_kretprobe2_probe (struct kretprobe_instance *inst,"; |
e6fe60e7 AM |
9382 | s.op->line() << " struct pt_regs *regs) {"; |
9383 | s.op->newline(1) << "struct kretprobe *krp = inst->rp;"; | |
935447c8 | 9384 | |
e6fe60e7 AM |
9385 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS |
9386 | s.op->newline() << "int kprobe_idx = ((uintptr_t)krp-(uintptr_t)stap_dwarfless_kprobes)/sizeof(struct stap_dwarfless_kprobe);"; | |
9387 | // Check that the index is plausible | |
9388 | s.op->newline() << "struct stap_dwarfless_probe *sdp = &stap_dwarfless_probes["; | |
9389 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
9390 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
9391 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
9392 | s.op->line() << "];"; | |
935447c8 | 9393 | |
71db462b | 9394 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sdp->probe", |
cda141c2 | 9395 | "stp_probe_type_kretprobe"); |
d9aed31e | 9396 | s.op->newline() << "c->kregs = regs;"; |
6dceb5c9 | 9397 | s.op->newline() << "c->ips.krp.pi = inst;"; // for assisting runtime's backtrace logic |
6415ddde MW |
9398 | |
9399 | // Make it look like the IP is set as it wouldn't have been replaced | |
9400 | // by a breakpoint instruction when calling real probe handler. Reset | |
9401 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
9402 | s.op->newline() << "{"; | |
9403 | s.op->indent(1); | |
d9aed31e | 9404 | s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
259d54c0 | 9405 | s.op->newline() << "SET_REG_IP(regs, (unsigned long) inst->rp->kp.addr);"; |
26e63673 | 9406 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
259d54c0 | 9407 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
9408 | s.op->newline(-1) << "}"; |
9409 | ||
f887a8c9 | 9410 | common_probe_entryfn_epilogue (s, true); |
e6fe60e7 AM |
9411 | s.op->newline() << "return 0;"; |
9412 | s.op->newline(-1) << "}"; | |
bd659351 | 9413 | |
03a4ec63 | 9414 | s.op->newline() << "#ifdef STAPCONF_KALLSYMS_ON_EACH_SYMBOL"; |
bd659351 MW |
9415 | s.op->newline() << "static int kprobe_resolve(void *data, const char *name,"; |
9416 | s.op->newline() << " struct module *owner,"; | |
9417 | s.op->newline() << " unsigned long val) {"; | |
9418 | s.op->newline(1) << "int i;"; | |
fc1d2aa2 MW |
9419 | s.op->newline() << "int *p = (int *) data;"; |
9420 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() | |
9421 | << " && *p > 0; i++) {"; | |
bd659351 | 9422 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; |
8c272819 YW |
9423 | s.op->newline() << "if (! sdp->address) {"; |
9424 | s.op->indent(1); | |
9425 | s.op->newline() << "const char *colon;"; | |
9426 | s.op->newline() << "if (owner && (colon = strchr(sdp->symbol_string, ':'))) {"; | |
9427 | s.op->indent(1); | |
9428 | s.op->newline() << "if ((strlen(owner->name) == (colon - sdp->symbol_string))"; | |
9429 | s.op->newline() << " && (strncmp(sdp->symbol_string, owner->name, colon - sdp->symbol_string) == 0)"; | |
9430 | s.op->newline() << " && (strcmp(colon + 1, name) == 0)) {"; | |
9431 | s.op->newline(1) << "sdp->address = val;"; | |
9432 | s.op->newline() << "(*p)--;"; | |
9433 | s.op->newline(-1) << "}"; | |
9434 | s.op->newline(-1) << "}"; | |
9435 | s.op->newline() << "else {"; | |
fc1d2aa2 | 9436 | s.op->newline(1) << "if (strcmp(sdp->symbol_string, name) == 0) {"; |
bd659351 | 9437 | s.op->newline(1) << "sdp->address = val;"; |
fc1d2aa2 MW |
9438 | s.op->newline() << "(*p)--;"; |
9439 | s.op->newline(-1) << "}"; | |
8c272819 YW |
9440 | s.op->newline(-1) << "}"; |
9441 | s.op->newline(-1) << "}"; | |
9442 | s.op->newline(-1) << "}"; | |
fc1d2aa2 | 9443 | s.op->newline() << "return (p > 0) ? 0 : -1;"; |
bd659351 | 9444 | s.op->newline(-1) << "}"; |
03a4ec63 | 9445 | s.op->newline() << "#endif"; |
935447c8 DS |
9446 | } |
9447 | ||
e6fe60e7 | 9448 | |
6270adc1 | 9449 | void |
e6fe60e7 | 9450 | kprobe_derived_probe_group::emit_module_init (systemtap_session& s) |
6270adc1 | 9451 | { |
03a4ec63 | 9452 | s.op->newline() << "#ifdef STAPCONF_KALLSYMS_ON_EACH_SYMBOL"; |
fc1d2aa2 MW |
9453 | s.op->newline() << "{"; |
9454 | s.op->newline(1) << "int p = 0;"; | |
9455 | s.op->newline() << "for (i = 0; i < " << probes_by_module.size() << "; i++) {"; | |
9456 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
9457 | s.op->newline() << "if (! sdp->address)"; | |
9458 | s.op->newline(1) << "p++;"; | |
9459 | s.op->newline(-2) << "}"; | |
9460 | s.op->newline() << "kallsyms_on_each_symbol(kprobe_resolve, &p);"; | |
9461 | s.op->newline(-1) << "}"; | |
03a4ec63 | 9462 | s.op->newline() << "#endif"; |
bd659351 | 9463 | |
e6fe60e7 | 9464 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
c8d9d15e | 9465 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; |
e6fe60e7 | 9466 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; |
c8d9d15e | 9467 | s.op->newline() << "void *addr = (void *) sdp->address;"; |
03a4ec63 MW |
9468 | s.op->newline() << "const char *symbol_name = addr ? NULL : sdp->symbol_string;"; |
9469 | ||
9470 | s.op->newline() << "#ifdef STAPCONF_KALLSYMS_ON_EACH_SYMBOL"; | |
bd659351 MW |
9471 | s.op->newline() << "if (! addr) {"; |
9472 | s.op->newline(1) << "sdp->registered_p = 0;"; | |
9319b767 MW |
9473 | s.op->newline() << "if (!sdp->optional_p)"; |
9474 | s.op->newline(1) << "_stp_warn (\"probe %s registration error (symbol not found)\", probe_point);"; | |
9475 | s.op->newline(-1) << "continue;"; | |
bd659351 | 9476 | s.op->newline(-1) << "}"; |
03a4ec63 MW |
9477 | s.op->newline() << "#endif"; |
9478 | ||
26e63673 | 9479 | s.op->newline() << "probe_point = sdp->probe->pp;"; // for error messages |
e6fe60e7 | 9480 | s.op->newline() << "if (sdp->return_p) {"; |
c8d9d15e | 9481 | s.op->newline(1) << "kp->u.krp.kp.addr = addr;"; |
766cee5f | 9482 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
03a4ec63 | 9483 | s.op->newline() << "kp->u.krp.kp.symbol_name = (char *) symbol_name;"; |
766cee5f | 9484 | s.op->newline() << "#endif"; |
e6fe60e7 AM |
9485 | s.op->newline() << "if (sdp->maxactive_p) {"; |
9486 | s.op->newline(1) << "kp->u.krp.maxactive = sdp->maxactive_val;"; | |
9487 | s.op->newline(-1) << "} else {"; | |
f07c3b68 | 9488 | s.op->newline(1) << "kp->u.krp.maxactive = KRETACTIVE;"; |
e6fe60e7 | 9489 | s.op->newline(-1) << "}"; |
88747011 | 9490 | s.op->newline() << "kp->u.krp.handler = &enter_kretprobe2_probe;"; |
e6fe60e7 AM |
9491 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 |
9492 | s.op->newline() << "#ifdef __ia64__"; | |
e6fe60e7 | 9493 | s.op->newline() << "kp->dummy.addr = kp->u.krp.kp.addr;"; |
766cee5f | 9494 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
c8d9d15e | 9495 | s.op->newline() << "kp->dummy.symbol_name = kp->u.krp.kp.symbol_name;"; |
766cee5f | 9496 | s.op->newline() << "#endif"; |
c8d9d15e | 9497 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; |
e6fe60e7 AM |
9498 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; |
9499 | s.op->newline() << "if (rc == 0) {"; | |
9500 | s.op->newline(1) << "rc = register_kretprobe (& kp->u.krp);"; | |
9501 | s.op->newline() << "if (rc != 0)"; | |
9502 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
9503 | s.op->newline(-2) << "}"; | |
9504 | s.op->newline() << "#else"; | |
9505 | s.op->newline() << "rc = register_kretprobe (& kp->u.krp);"; | |
9506 | s.op->newline() << "#endif"; | |
9507 | s.op->newline(-1) << "} else {"; | |
9508 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 | |
c8d9d15e | 9509 | s.op->newline(1) << "kp->u.kp.addr = addr;"; |
766cee5f | 9510 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
03a4ec63 | 9511 | s.op->newline() << "kp->u.kp.symbol_name = (char *) symbol_name;"; |
766cee5f | 9512 | s.op->newline() << "#endif"; |
88747011 | 9513 | s.op->newline() << "kp->u.kp.pre_handler = &enter_kprobe2_probe;"; |
e6fe60e7 | 9514 | s.op->newline() << "#ifdef __ia64__"; |
e6fe60e7 | 9515 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; |
c8d9d15e | 9516 | s.op->newline() << "kp->dummy.addr = kp->u.kp.addr;"; |
766cee5f | 9517 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
c8d9d15e | 9518 | s.op->newline() << "kp->dummy.symbol_name = kp->u.kp.symbol_name;"; |
766cee5f | 9519 | s.op->newline() << "#endif"; |
e6fe60e7 AM |
9520 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; |
9521 | s.op->newline() << "if (rc == 0) {"; | |
9522 | s.op->newline(1) << "rc = register_kprobe (& kp->u.kp);"; | |
9523 | s.op->newline() << "if (rc != 0)"; | |
9524 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
9525 | s.op->newline(-2) << "}"; | |
9526 | s.op->newline() << "#else"; | |
9527 | s.op->newline() << "rc = register_kprobe (& kp->u.kp);"; | |
9528 | s.op->newline() << "#endif"; | |
9529 | s.op->newline(-1) << "}"; | |
9530 | s.op->newline() << "if (rc) {"; // PR6749: tolerate a failed register_*probe. | |
9531 | s.op->newline(1) << "sdp->registered_p = 0;"; | |
b350f56b | 9532 | s.op->newline() << "if (!sdp->optional_p)"; |
50b6acf7 | 9533 | s.op->newline(1) << "_stp_warn (\"probe %s (address 0x%lx) registration error (rc %d)\", probe_point, (unsigned long) addr, rc);"; |
b350f56b | 9534 | s.op->newline(-1) << "rc = 0;"; // continue with other probes |
e6fe60e7 AM |
9535 | // XXX: shall we increment numskipped? |
9536 | s.op->newline(-1) << "}"; | |
6270adc1 | 9537 | |
e6fe60e7 AM |
9538 | s.op->newline() << "else sdp->registered_p = 1;"; |
9539 | s.op->newline(-1) << "}"; // for loop | |
6270adc1 MH |
9540 | } |
9541 | ||
b4be7cbc | 9542 | |
e6fe60e7 AM |
9543 | void |
9544 | kprobe_derived_probe_group::emit_module_exit (systemtap_session& s) | |
935447c8 | 9545 | { |
e6fe60e7 AM |
9546 | //Unregister kprobes by batch interfaces. |
9547 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
9548 | s.op->newline() << "j = 0;"; | |
9549 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
9550 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
9551 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
9552 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
9553 | s.op->newline() << "if (!sdp->return_p)"; | |
c9116e99 | 9554 | s.op->newline(1) << "stap_unreg_kprobes2[j++] = &kp->u.kp;"; |
e6fe60e7 | 9555 | s.op->newline(-2) << "}"; |
c9116e99 | 9556 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes2, j);"; |
e6fe60e7 AM |
9557 | s.op->newline() << "j = 0;"; |
9558 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
9559 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
9560 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
9561 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
9562 | s.op->newline() << "if (sdp->return_p)"; | |
c9116e99 | 9563 | s.op->newline(1) << "stap_unreg_kprobes2[j++] = &kp->u.krp;"; |
e6fe60e7 | 9564 | s.op->newline(-2) << "}"; |
c9116e99 | 9565 | s.op->newline() << "unregister_kretprobes((struct kretprobe **)stap_unreg_kprobes2, j);"; |
e6fe60e7 AM |
9566 | s.op->newline() << "#ifdef __ia64__"; |
9567 | s.op->newline() << "j = 0;"; | |
9568 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
9569 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
9570 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
9571 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
c9116e99 | 9572 | s.op->newline() << "stap_unreg_kprobes2[j++] = &kp->dummy;"; |
e6fe60e7 | 9573 | s.op->newline(-1) << "}"; |
c9116e99 | 9574 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes2, j);"; |
e6fe60e7 AM |
9575 | s.op->newline() << "#endif"; |
9576 | s.op->newline() << "#endif"; | |
3e3bd7b6 | 9577 | |
e6fe60e7 AM |
9578 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
9579 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
9580 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
9581 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
9582 | s.op->newline() << "if (sdp->return_p) {"; | |
9583 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; | |
9584 | s.op->newline(1) << "unregister_kretprobe (&kp->u.krp);"; | |
9585 | s.op->newline() << "#endif"; | |
065d5567 | 9586 | s.op->newline() << "atomic_add (kp->u.krp.nmissed, skipped_count());"; |
e6fe60e7 AM |
9587 | s.op->newline() << "#ifdef STP_TIMING"; |
9588 | s.op->newline() << "if (kp->u.krp.nmissed)"; | |
26e63673 | 9589 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/1 on '%s': %d\\n\", sdp->probe->pp, kp->u.krp.nmissed);"; |
e6fe60e7 | 9590 | s.op->newline(-1) << "#endif"; |
065d5567 | 9591 | s.op->newline() << "atomic_add (kp->u.krp.kp.nmissed, skipped_count());"; |
e6fe60e7 AM |
9592 | s.op->newline() << "#ifdef STP_TIMING"; |
9593 | s.op->newline() << "if (kp->u.krp.kp.nmissed)"; | |
26e63673 | 9594 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/2 on '%s': %lu\\n\", sdp->probe->pp, kp->u.krp.kp.nmissed);"; |
e6fe60e7 AM |
9595 | s.op->newline(-1) << "#endif"; |
9596 | s.op->newline(-1) << "} else {"; | |
9597 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; | |
9598 | s.op->newline(1) << "unregister_kprobe (&kp->u.kp);"; | |
9599 | s.op->newline() << "#endif"; | |
065d5567 | 9600 | s.op->newline() << "atomic_add (kp->u.kp.nmissed, skipped_count());"; |
e6fe60e7 AM |
9601 | s.op->newline() << "#ifdef STP_TIMING"; |
9602 | s.op->newline() << "if (kp->u.kp.nmissed)"; | |
26e63673 | 9603 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kprobe on '%s': %lu\\n\", sdp->probe->pp, kp->u.kp.nmissed);"; |
e6fe60e7 AM |
9604 | s.op->newline(-1) << "#endif"; |
9605 | s.op->newline(-1) << "}"; | |
9606 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES) && defined(__ia64__)"; | |
9607 | s.op->newline() << "unregister_kprobe (&kp->dummy);"; | |
9608 | s.op->newline() << "#endif"; | |
9609 | s.op->newline() << "sdp->registered_p = 0;"; | |
9610 | s.op->newline(-1) << "}"; | |
f8a968bc JS |
9611 | } |
9612 | ||
e6fe60e7 | 9613 | struct kprobe_builder: public derived_probe_builder |
3c1b3d06 | 9614 | { |
9fdf787d | 9615 | public: |
2a639817 | 9616 | kprobe_builder() {} |
9fdf787d | 9617 | |
2a639817 | 9618 | void build_no_more (systemtap_session &s) {} |
9fdf787d | 9619 | |
e6fe60e7 AM |
9620 | virtual void build(systemtap_session & sess, |
9621 | probe * base, | |
9622 | probe_point * location, | |
9623 | literal_map_t const & parameters, | |
9624 | vector<derived_probe *> & finished_results); | |
9625 | }; | |
3c1b3d06 FCE |
9626 | |
9627 | ||
79189b84 | 9628 | void |
05fb3e0c | 9629 | kprobe_builder::build(systemtap_session & sess, |
e6fe60e7 AM |
9630 | probe * base, |
9631 | probe_point * location, | |
9632 | literal_map_t const & parameters, | |
9633 | vector<derived_probe *> & finished_results) | |
79189b84 | 9634 | { |
e6fe60e7 | 9635 | string function_string_val, module_string_val; |
05fb3e0c | 9636 | string path, library, path_tgt, library_tgt; |
b6371390 JS |
9637 | int64_t statement_num_val = 0, maxactive_val = 0; |
9638 | bool has_function_str, has_module_str, has_statement_num; | |
e6afb07b | 9639 | bool has_absolute, has_call, has_return, has_maxactive; |
b642c901 | 9640 | bool has_path, has_library; |
79189b84 | 9641 | |
b6371390 JS |
9642 | has_function_str = get_param(parameters, TOK_FUNCTION, function_string_val); |
9643 | has_module_str = get_param(parameters, TOK_MODULE, module_string_val); | |
e6afb07b | 9644 | has_call = has_null_param (parameters, TOK_CALL); |
b6371390 JS |
9645 | has_return = has_null_param (parameters, TOK_RETURN); |
9646 | has_maxactive = get_param(parameters, TOK_MAXACTIVE, maxactive_val); | |
9647 | has_statement_num = get_param(parameters, TOK_STATEMENT, statement_num_val); | |
9648 | has_absolute = has_null_param (parameters, TOK_ABSOLUTE); | |
b642c901 SC |
9649 | has_path = get_param (parameters, TOK_PROCESS, path); |
9650 | has_library = get_param (parameters, TOK_LIBRARY, library); | |
9651 | ||
9652 | if (has_path) | |
05fb3e0c WF |
9653 | { |
9654 | path = find_executable (path, sess.sysroot, sess.sysenv); | |
9655 | path_tgt = path_remove_sysroot(sess, path); | |
9656 | } | |
b642c901 | 9657 | if (has_library) |
05fb3e0c WF |
9658 | { |
9659 | library = find_executable (library, sess.sysroot, sess.sysenv, | |
9660 | "LD_LIBRARY_PATH"); | |
9661 | library_tgt = path_remove_sysroot(sess, library); | |
9662 | } | |
c57ea854 | 9663 | |
b6371390 | 9664 | if (has_function_str) |
6fb70fb7 | 9665 | { |
2a639817 | 9666 | if (has_module_str) |
9fdf787d DS |
9667 | { |
9668 | function_string_val = module_string_val + ":" + function_string_val; | |
9669 | derived_probe *dp | |
23dc94f6 DS |
9670 | = new kprobe_derived_probe (sess, finished_results, base, |
9671 | location, function_string_val, | |
e6afb07b JL |
9672 | 0, has_call, has_return, |
9673 | has_statement_num, has_maxactive, | |
9674 | has_path, has_library, maxactive_val, | |
9675 | path_tgt, library_tgt); | |
9fdf787d DS |
9676 | finished_results.push_back (dp); |
9677 | } | |
9678 | else | |
9679 | { | |
2a639817 JS |
9680 | vector<string> matches; |
9681 | ||
9682 | // Simple names can be found directly | |
9683 | if (function_string_val.find_first_of("*?[") == string::npos) | |
9684 | { | |
9685 | if (sess.kernel_functions.count(function_string_val)) | |
9686 | matches.push_back(function_string_val); | |
9687 | } | |
9688 | else // Search function name list for matching names | |
9689 | { | |
9690 | for (set<string>::const_iterator it = sess.kernel_functions.begin(); | |
9691 | it != sess.kernel_functions.end(); it++) | |
9692 | // fnmatch returns zero for matching. | |
9693 | if (fnmatch(function_string_val.c_str(), it->c_str(), 0) == 0) | |
9694 | matches.push_back(*it); | |
9695 | } | |
86758d5f | 9696 | |
2a639817 JS |
9697 | for (vector<string>::const_iterator it = matches.begin(); |
9698 | it != matches.end(); it++) | |
9fdf787d | 9699 | { |
2a639817 JS |
9700 | derived_probe *dp |
9701 | = new kprobe_derived_probe (sess, finished_results, base, | |
e6afb07b JL |
9702 | location, *it, 0, has_call, |
9703 | has_return, has_statement_num, | |
2a639817 JS |
9704 | has_maxactive, has_path, |
9705 | has_library, maxactive_val, | |
9706 | path_tgt, library_tgt); | |
9707 | finished_results.push_back (dp); | |
9fdf787d DS |
9708 | } |
9709 | } | |
6fb70fb7 | 9710 | } |
e6fe60e7 | 9711 | else |
b6371390 JS |
9712 | { |
9713 | // assert guru mode for absolute probes | |
9714 | if ( has_statement_num && has_absolute && !base->privileged ) | |
dc09353a | 9715 | throw SEMANTIC_ERROR (_("absolute statement probe in unprivileged script; need stap -g"), base->tok); |
b6371390 | 9716 | |
23dc94f6 DS |
9717 | finished_results.push_back (new kprobe_derived_probe (sess, |
9718 | finished_results, | |
9719 | base, | |
b6371390 JS |
9720 | location, "", |
9721 | statement_num_val, | |
e6afb07b | 9722 | has_call, |
b6371390 JS |
9723 | has_return, |
9724 | has_statement_num, | |
9725 | has_maxactive, | |
b642c901 SC |
9726 | has_path, |
9727 | has_library, | |
9728 | maxactive_val, | |
05fb3e0c WF |
9729 | path_tgt, |
9730 | library_tgt)); | |
96b030fe | 9731 | } |
79189b84 JS |
9732 | } |
9733 | ||
23dc94f6 DS |
9734 | |
9735 | void | |
9736 | kprobe_var_expanding_visitor::visit_entry_op (entry_op *e) | |
9737 | { | |
9738 | expression *repl = e; | |
9739 | ||
bd5b25e1 JS |
9740 | if (has_return) |
9741 | { | |
9742 | // expand the operand as if it weren't a return probe | |
9743 | has_return = false; | |
9744 | replace (e->operand); | |
9745 | has_return = true; | |
23dc94f6 | 9746 | |
bd5b25e1 JS |
9747 | // XXX it would be nice to use gen_kretprobe_saved_return when |
9748 | // available, but it requires knowing the types already, which is | |
9749 | // problematic for arbitrary expressons. | |
9750 | repl = gen_mapped_saved_return (sess, e->operand, "entry", | |
9751 | add_block, add_block_tid, | |
9752 | add_call_probe, add_call_probe_tid); | |
9753 | } | |
23dc94f6 DS |
9754 | provide (repl); |
9755 | } | |
9756 | ||
9757 | ||
dd225250 PS |
9758 | // ------------------------------------------------------------------------ |
9759 | // Hardware breakpoint based probes. | |
9760 | // ------------------------------------------------------------------------ | |
9761 | ||
9762 | static const string TOK_HWBKPT("data"); | |
9763 | static const string TOK_HWBKPT_WRITE("write"); | |
9764 | static const string TOK_HWBKPT_RW("rw"); | |
9765 | static const string TOK_LENGTH("length"); | |
9766 | ||
9767 | #define HWBKPT_READ 0 | |
9768 | #define HWBKPT_WRITE 1 | |
9769 | #define HWBKPT_RW 2 | |
9770 | struct hwbkpt_derived_probe: public derived_probe | |
9771 | { | |
9772 | hwbkpt_derived_probe (probe *base, | |
9773 | probe_point *location, | |
9774 | uint64_t addr, | |
9775 | string symname, | |
9776 | unsigned int len, | |
9777 | bool has_only_read_access, | |
9778 | bool has_only_write_access, | |
9779 | bool has_rw_access | |
9780 | ); | |
9781 | Dwarf_Addr hwbkpt_addr; | |
9782 | string symbol_name; | |
9783 | unsigned int hwbkpt_access,hwbkpt_len; | |
9784 | ||
9785 | void printsig (std::ostream &o) const; | |
9786 | void join_group (systemtap_session& s); | |
9787 | }; | |
9788 | ||
9789 | struct hwbkpt_derived_probe_group: public derived_probe_group | |
9790 | { | |
dd225250 | 9791 | private: |
dac77b80 | 9792 | vector<hwbkpt_derived_probe*> hwbkpt_probes; |
dd225250 PS |
9793 | |
9794 | public: | |
9795 | void enroll (hwbkpt_derived_probe* probe, systemtap_session& s); | |
9796 | void emit_module_decls (systemtap_session& s); | |
9797 | void emit_module_init (systemtap_session& s); | |
9798 | void emit_module_exit (systemtap_session& s); | |
9799 | }; | |
9800 | ||
9801 | hwbkpt_derived_probe::hwbkpt_derived_probe (probe *base, | |
9ea68eb9 JS |
9802 | probe_point *location, |
9803 | uint64_t addr, | |
9804 | string symname, | |
9805 | unsigned int len, | |
9806 | bool has_only_read_access, | |
9807 | bool has_only_write_access, | |
822a6a3d | 9808 | bool): |
4c5d1300 | 9809 | derived_probe (base, location, true /* .components soon rewritten */ ), |
dd225250 PS |
9810 | hwbkpt_addr (addr), |
9811 | symbol_name (symname), | |
9812 | hwbkpt_len (len) | |
9813 | { | |
9814 | this->tok = base->tok; | |
9815 | ||
9816 | vector<probe_point::component*> comps; | |
9817 | comps.push_back (new probe_point::component(TOK_KERNEL)); | |
9818 | ||
9819 | if (hwbkpt_addr) | |
9ea68eb9 JS |
9820 | comps.push_back (new probe_point::component (TOK_HWBKPT, |
9821 | new literal_number(hwbkpt_addr, true))); | |
9822 | else if (symbol_name.size()) | |
9823 | comps.push_back (new probe_point::component (TOK_HWBKPT, new literal_string(symbol_name))); | |
dd225250 PS |
9824 | |
9825 | comps.push_back (new probe_point::component (TOK_LENGTH, new literal_number(hwbkpt_len))); | |
9826 | ||
9827 | if (has_only_read_access) | |
9ea68eb9 | 9828 | this->hwbkpt_access = HWBKPT_READ ; |
dd225250 PS |
9829 | //TODO add code for comps.push_back for read, since this flag is not for x86 |
9830 | ||
9831 | else | |
9ea68eb9 JS |
9832 | { |
9833 | if (has_only_write_access) | |
9834 | { | |
9835 | this->hwbkpt_access = HWBKPT_WRITE ; | |
9836 | comps.push_back (new probe_point::component(TOK_HWBKPT_WRITE)); | |
9837 | } | |
9838 | else | |
9839 | { | |
9840 | this->hwbkpt_access = HWBKPT_RW ; | |
9841 | comps.push_back (new probe_point::component(TOK_HWBKPT_RW)); | |
9842 | } | |
9843 | } | |
dd225250 PS |
9844 | |
9845 | this->sole_location()->components = comps; | |
9846 | } | |
9847 | ||
9848 | void hwbkpt_derived_probe::printsig (ostream& o) const | |
9849 | { | |
9850 | sole_location()->print (o); | |
9851 | printsig_nested (o); | |
9852 | } | |
9853 | ||
9854 | void hwbkpt_derived_probe::join_group (systemtap_session& s) | |
9855 | { | |
dac77b80 FCE |
9856 | if (! s.hwbkpt_derived_probes) |
9857 | s.hwbkpt_derived_probes = new hwbkpt_derived_probe_group (); | |
dd225250 PS |
9858 | s.hwbkpt_derived_probes->enroll (this, s); |
9859 | } | |
9860 | ||
9861 | void hwbkpt_derived_probe_group::enroll (hwbkpt_derived_probe* p, systemtap_session& s) | |
9862 | { | |
dac77b80 FCE |
9863 | hwbkpt_probes.push_back (p); |
9864 | ||
9865 | unsigned max_hwbkpt_probes_by_arch = 0; | |
9866 | if (s.architecture == "i386" || s.architecture == "x86_64") | |
9867 | max_hwbkpt_probes_by_arch = 4; | |
9868 | else if (s.architecture == "s390") | |
9869 | max_hwbkpt_probes_by_arch = 1; | |
9870 | ||
c57ea854 | 9871 | if (hwbkpt_probes.size() >= max_hwbkpt_probes_by_arch) |
2713ea24 | 9872 | s.print_warning (_F("Too many hardware breakpoint probes requested for %s (%zu vs. %u)", |
b530b5b3 | 9873 | s.architecture.c_str(), hwbkpt_probes.size(), max_hwbkpt_probes_by_arch)); |
dd225250 PS |
9874 | } |
9875 | ||
9876 | void | |
9877 | hwbkpt_derived_probe_group::emit_module_decls (systemtap_session& s) | |
9878 | { | |
dac77b80 | 9879 | if (hwbkpt_probes.empty()) return; |
dd225250 PS |
9880 | |
9881 | s.op->newline() << "/* ---- hwbkpt-based probes ---- */"; | |
9882 | ||
9883 | s.op->newline() << "#include <linux/perf_event.h>"; | |
9884 | s.op->newline() << "#include <linux/hw_breakpoint.h>"; | |
9885 | s.op->newline(); | |
9886 | ||
9887 | // Forward declare the master entry functions | |
23063de1 | 9888 | s.op->newline() << "#ifdef STAPCONF_PERF_HANDLER_NMI"; |
dd225250 PS |
9889 | s.op->newline() << "static int enter_hwbkpt_probe (struct perf_event *bp,"; |
9890 | s.op->line() << " int nmi,"; | |
9891 | s.op->line() << " struct perf_sample_data *data,"; | |
9892 | s.op->line() << " struct pt_regs *regs);"; | |
23063de1 FCE |
9893 | s.op->newline() << "#else"; |
9894 | s.op->newline() << "static int enter_hwbkpt_probe (struct perf_event *bp,"; | |
9895 | s.op->line() << " struct perf_sample_data *data,"; | |
9896 | s.op->line() << " struct pt_regs *regs);"; | |
9897 | s.op->newline() << "#endif"; | |
79189b84 | 9898 | |
dd225250 PS |
9899 | // Emit the actual probe list. |
9900 | ||
9901 | s.op->newline() << "static struct perf_event_attr "; | |
dac77b80 | 9902 | s.op->newline() << "stap_hwbkpt_probe_array[" << hwbkpt_probes.size() << "];"; |
dd225250 PS |
9903 | |
9904 | s.op->newline() << "static struct perf_event **"; | |
dac77b80 | 9905 | s.op->newline() << "stap_hwbkpt_ret_array[" << hwbkpt_probes.size() << "];"; |
dd225250 PS |
9906 | s.op->newline() << "static struct stap_hwbkpt_probe {"; |
9907 | s.op->newline() << "int registered_p:1;"; | |
43650b10 | 9908 | // registered_p = 0 signifies a probe that is unregistered (or failed) |
dd225250 PS |
9909 | // registered_p = 1 signifies a probe that got registered successfully |
9910 | ||
faea5e16 | 9911 | // Symbol Names are mostly small and uniform enough |
dd225250 | 9912 | // to justify putting const char*. |
dac77b80 | 9913 | s.op->newline() << "const char * const symbol;"; |
dd225250 PS |
9914 | |
9915 | s.op->newline() << "const unsigned long address;"; | |
9916 | s.op->newline() << "uint8_t atype;"; | |
bb0a4e12 | 9917 | s.op->newline() << "unsigned int len;"; |
7c3e97f4 | 9918 | s.op->newline() << "const struct stap_probe * const probe;"; |
dd225250 PS |
9919 | s.op->newline() << "} stap_hwbkpt_probes[] = {"; |
9920 | s.op->indent(1); | |
9921 | ||
dac77b80 | 9922 | for (unsigned int it = 0; it < hwbkpt_probes.size(); it++) |
dd225250 | 9923 | { |
dac77b80 | 9924 | hwbkpt_derived_probe* p = hwbkpt_probes.at(it); |
dd225250 | 9925 | s.op->newline() << "{"; |
dd225250 PS |
9926 | if (p->symbol_name.size()) |
9927 | s.op->line() << " .address=(unsigned long)0x0" << "ULL,"; | |
9928 | else | |
9929 | s.op->line() << " .address=(unsigned long)0x" << hex << p->hwbkpt_addr << dec << "ULL,"; | |
9930 | switch(p->hwbkpt_access){ | |
9931 | case HWBKPT_READ: | |
9932 | s.op->line() << " .atype=HW_BREAKPOINT_R ,"; | |
bb0a4e12 | 9933 | break; |
dd225250 PS |
9934 | case HWBKPT_WRITE: |
9935 | s.op->line() << " .atype=HW_BREAKPOINT_W ,"; | |
bb0a4e12 | 9936 | break; |
dd225250 PS |
9937 | case HWBKPT_RW: |
9938 | s.op->line() << " .atype=HW_BREAKPOINT_R|HW_BREAKPOINT_W ,"; | |
bb0a4e12 | 9939 | break; |
dd225250 PS |
9940 | }; |
9941 | s.op->line() << " .len=" << p->hwbkpt_len << ","; | |
faea5e16 | 9942 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
dd225250 | 9943 | s.op->line() << " .symbol=\"" << p->symbol_name << "\","; |
dd225250 PS |
9944 | s.op->line() << " },"; |
9945 | } | |
dac77b80 | 9946 | s.op->newline(-1) << "};"; |
dd225250 PS |
9947 | |
9948 | // Emit the hwbkpt callback function | |
9949 | s.op->newline() ; | |
23063de1 | 9950 | s.op->newline() << "#ifdef STAPCONF_PERF_HANDLER_NMI"; |
dd225250 PS |
9951 | s.op->newline() << "static int enter_hwbkpt_probe (struct perf_event *bp,"; |
9952 | s.op->line() << " int nmi,"; | |
9953 | s.op->line() << " struct perf_sample_data *data,"; | |
9954 | s.op->line() << " struct pt_regs *regs) {"; | |
23063de1 FCE |
9955 | s.op->newline() << "#else"; |
9956 | s.op->newline() << "static int enter_hwbkpt_probe (struct perf_event *bp,"; | |
9957 | s.op->line() << " struct perf_sample_data *data,"; | |
9958 | s.op->line() << " struct pt_regs *regs) {"; | |
9959 | s.op->newline() << "#endif"; | |
dac77b80 FCE |
9960 | s.op->newline(1) << "unsigned int i;"; |
9961 | s.op->newline() << "if (bp->attr.type != PERF_TYPE_BREAKPOINT) return -1;"; | |
9962 | s.op->newline() << "for (i=0; i<" << hwbkpt_probes.size() << "; i++) {"; | |
9963 | s.op->newline(1) << "struct perf_event_attr *hp = & stap_hwbkpt_probe_array[i];"; | |
9964 | // XXX: why not match stap_hwbkpt_ret_array[i] against bp instead? | |
9965 | s.op->newline() << "if (bp->attr.bp_addr==hp->bp_addr && bp->attr.bp_type==hp->bp_type && bp->attr.bp_len==hp->bp_len) {"; | |
9966 | s.op->newline(1) << "struct stap_hwbkpt_probe *sdp = &stap_hwbkpt_probes[i];"; | |
71db462b | 9967 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "sdp->probe", |
cda141c2 | 9968 | "stp_probe_type_hwbkpt"); |
d9aed31e | 9969 | s.op->newline() << "if (user_mode(regs)) {"; |
e04b5d74 | 9970 | s.op->newline(1)<< "c->user_mode_p = 1;"; |
d9aed31e MW |
9971 | s.op->newline() << "c->uregs = regs;"; |
9972 | s.op->newline(-1) << "} else {"; | |
9973 | s.op->newline(1) << "c->kregs = regs;"; | |
9974 | s.op->newline(-1) << "}"; | |
26e63673 | 9975 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
f887a8c9 | 9976 | common_probe_entryfn_epilogue (s, true); |
dac77b80 | 9977 | s.op->newline(-1) << "}"; |
dd225250 PS |
9978 | s.op->newline(-1) << "}"; |
9979 | s.op->newline() << "return 0;"; | |
dac77b80 | 9980 | s.op->newline(-1) << "}"; |
dd225250 PS |
9981 | } |
9982 | ||
9983 | void | |
9984 | hwbkpt_derived_probe_group::emit_module_init (systemtap_session& s) | |
9985 | { | |
dac77b80 | 9986 | s.op->newline() << "for (i=0; i<" << hwbkpt_probes.size() << "; i++) {"; |
dd225250 PS |
9987 | s.op->newline(1) << "struct stap_hwbkpt_probe *sdp = & stap_hwbkpt_probes[i];"; |
9988 | s.op->newline() << "struct perf_event_attr *hp = & stap_hwbkpt_probe_array[i];"; | |
9989 | s.op->newline() << "void *addr = (void *) sdp->address;"; | |
9990 | s.op->newline() << "const char *hwbkpt_symbol_name = addr ? NULL : sdp->symbol;"; | |
dac77b80 FCE |
9991 | s.op->newline() << "hw_breakpoint_init(hp);"; |
9992 | s.op->newline() << "if (addr)"; | |
9993 | s.op->newline(1) << "hp->bp_addr = (unsigned long) addr;"; | |
9994 | s.op->newline(-1) << "else { "; | |
9995 | s.op->newline(1) << "hp->bp_addr = kallsyms_lookup_name(hwbkpt_symbol_name);"; | |
9996 | s.op->newline() << "if (!hp->bp_addr) { "; | |
26e63673 | 9997 | s.op->newline(1) << "_stp_warn(\"Probe %s registration skipped: invalid symbol %s \",sdp->probe->pp,hwbkpt_symbol_name);"; |
dac77b80 FCE |
9998 | s.op->newline() << "continue;"; |
9999 | s.op->newline(-1) << "}"; | |
10000 | s.op->newline(-1) << "}"; | |
10001 | s.op->newline() << "hp->bp_type = sdp->atype;"; | |
10002 | ||
10003 | // On x86 & x86-64, hp->bp_len is not just a number but a macro/enum (!?!). | |
c57ea854 | 10004 | if (s.architecture == "i386" || s.architecture == "x86_64" ) |
dac77b80 FCE |
10005 | { |
10006 | s.op->newline() << "switch(sdp->len) {"; | |
10007 | s.op->newline() << "case 1:"; | |
10008 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_1;"; | |
10009 | s.op->newline() << "break;"; | |
10010 | s.op->newline(-1) << "case 2:"; | |
10011 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_2;"; | |
10012 | s.op->newline() << "break;"; | |
10013 | s.op->newline(-1) << "case 3:"; | |
10014 | s.op->newline() << "case 4:"; | |
10015 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_4;"; | |
10016 | s.op->newline() << "break;"; | |
10017 | s.op->newline(-1) << "case 5:"; | |
10018 | s.op->newline() << "case 6:"; | |
10019 | s.op->newline() << "case 7:"; | |
10020 | s.op->newline() << "case 8:"; | |
10021 | s.op->newline() << "default:"; // XXX: could instead reject | |
10022 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_8;"; | |
10023 | s.op->newline() << "break;"; | |
10024 | s.op->newline(-1) << "}"; | |
10025 | } | |
10026 | else // other architectures presumed straightforward | |
10027 | s.op->newline() << "hp->bp_len = sdp->len;"; | |
10028 | ||
26e63673 | 10029 | s.op->newline() << "probe_point = sdp->probe->pp;"; // for error messages |
b273669e MW |
10030 | s.op->newline() << "#ifdef STAPCONF_HW_BREAKPOINT_CONTEXT"; |
10031 | s.op->newline() << "stap_hwbkpt_ret_array[i] = register_wide_hw_breakpoint(hp, (void *)&enter_hwbkpt_probe, NULL);"; | |
10032 | s.op->newline() << "#else"; | |
dac77b80 | 10033 | s.op->newline() << "stap_hwbkpt_ret_array[i] = register_wide_hw_breakpoint(hp, (void *)&enter_hwbkpt_probe);"; |
b273669e | 10034 | s.op->newline() << "#endif"; |
43650b10 | 10035 | s.op->newline() << "rc = 0;"; |
dac77b80 | 10036 | s.op->newline() << "if (IS_ERR(stap_hwbkpt_ret_array[i])) {"; |
43650b10 WC |
10037 | s.op->newline(1) << "rc = PTR_ERR(stap_hwbkpt_ret_array[i]);"; |
10038 | s.op->newline() << "stap_hwbkpt_ret_array[i] = 0;"; | |
10039 | s.op->newline(-1) << "}"; | |
217ef1f4 WC |
10040 | s.op->newline() << "if (rc) {"; |
10041 | s.op->newline(1) << "_stp_warn(\"Hwbkpt probe %s: registration error %d, addr %p, name %s\", probe_point, rc, addr, hwbkpt_symbol_name);"; | |
43650b10 | 10042 | s.op->newline() << "sdp->registered_p = 0;"; |
dac77b80 | 10043 | s.op->newline(-1) << "}"; |
dd225250 | 10044 | s.op->newline() << " else sdp->registered_p = 1;"; |
dd225250 PS |
10045 | s.op->newline(-1) << "}"; // for loop |
10046 | } | |
10047 | ||
10048 | void | |
10049 | hwbkpt_derived_probe_group::emit_module_exit (systemtap_session& s) | |
10050 | { | |
10051 | //Unregister hwbkpt probes. | |
dac77b80 | 10052 | s.op->newline() << "for (i=0; i<" << hwbkpt_probes.size() << "; i++) {"; |
dd225250 | 10053 | s.op->newline(1) << "struct stap_hwbkpt_probe *sdp = & stap_hwbkpt_probes[i];"; |
dac77b80 FCE |
10054 | s.op->newline() << "if (sdp->registered_p == 0) continue;"; |
10055 | s.op->newline() << "unregister_wide_hw_breakpoint(stap_hwbkpt_ret_array[i]);"; | |
dd225250 PS |
10056 | s.op->newline() << "sdp->registered_p = 0;"; |
10057 | s.op->newline(-1) << "}"; | |
10058 | } | |
10059 | ||
10060 | struct hwbkpt_builder: public derived_probe_builder | |
10061 | { | |
10062 | hwbkpt_builder() {} | |
10063 | virtual void build(systemtap_session & sess, | |
10064 | probe * base, | |
10065 | probe_point * location, | |
10066 | literal_map_t const & parameters, | |
10067 | vector<derived_probe *> & finished_results); | |
10068 | }; | |
10069 | ||
10070 | void | |
10071 | hwbkpt_builder::build(systemtap_session & sess, | |
10072 | probe * base, | |
10073 | probe_point * location, | |
10074 | literal_map_t const & parameters, | |
10075 | vector<derived_probe *> & finished_results) | |
10076 | { | |
10077 | string symbol_str_val; | |
10078 | int64_t hwbkpt_address, len; | |
10079 | bool has_addr, has_symbol_str, has_write, has_rw, has_len; | |
10080 | ||
b47f3a55 | 10081 | if (! (sess.kernel_config["CONFIG_PERF_EVENTS"] == string("y"))) |
dc09353a | 10082 | throw SEMANTIC_ERROR (_("CONFIG_PERF_EVENTS not available on this kernel"), |
b47f3a55 FCE |
10083 | location->components[0]->tok); |
10084 | if (! (sess.kernel_config["CONFIG_HAVE_HW_BREAKPOINT"] == string("y"))) | |
dc09353a | 10085 | throw SEMANTIC_ERROR (_("CONFIG_HAVE_HW_BREAKPOINT not available on this kernel"), |
b47f3a55 FCE |
10086 | location->components[0]->tok); |
10087 | ||
dd225250 PS |
10088 | has_addr = get_param (parameters, TOK_HWBKPT, hwbkpt_address); |
10089 | has_symbol_str = get_param (parameters, TOK_HWBKPT, symbol_str_val); | |
10090 | has_len = get_param (parameters, TOK_LENGTH, len); | |
10091 | has_write = (parameters.find(TOK_HWBKPT_WRITE) != parameters.end()); | |
10092 | has_rw = (parameters.find(TOK_HWBKPT_RW) != parameters.end()); | |
10093 | ||
b31695eb JL |
10094 | // Make an intermediate pp that is well-formed. It's pretty much the same as |
10095 | // the user-provided one, except that the addr literal is well-typed. | |
10096 | probe_point* well_formed_loc = new probe_point(*location); | |
10097 | well_formed_loc->well_formed = true; | |
10098 | ||
10099 | vector<probe_point::component*> well_formed_comps; | |
10100 | vector<probe_point::component*>::iterator it; | |
10101 | for (it = location->components.begin(); | |
10102 | it != location->components.end(); ++it) | |
10103 | if ((*it)->functor == TOK_HWBKPT && has_addr) | |
10104 | well_formed_comps.push_back(new probe_point::component(TOK_HWBKPT, | |
10105 | new literal_number(hwbkpt_address, true /* hex */ ))); | |
10106 | else | |
10107 | well_formed_comps.push_back(*it); | |
10108 | well_formed_loc->components = well_formed_comps; | |
10109 | probe *new_base = new probe (base, well_formed_loc); | |
10110 | ||
dd225250 PS |
10111 | if (!has_len) |
10112 | len = 1; | |
10113 | ||
10114 | if (has_addr) | |
b31695eb | 10115 | finished_results.push_back (new hwbkpt_derived_probe (new_base, |
dd225250 PS |
10116 | location, |
10117 | hwbkpt_address, | |
10118 | "",len,0, | |
10119 | has_write, | |
10120 | has_rw)); | |
5d8a0aea | 10121 | else if (has_symbol_str) |
b31695eb | 10122 | finished_results.push_back (new hwbkpt_derived_probe (new_base, |
dd225250 PS |
10123 | location, |
10124 | 0, | |
10125 | symbol_str_val,len,0, | |
10126 | has_write, | |
10127 | has_rw)); | |
5d8a0aea FCE |
10128 | else |
10129 | assert (0); | |
dd225250 | 10130 | } |
342d3f96 | 10131 | |
0a6f5a3f JS |
10132 | // ------------------------------------------------------------------------ |
10133 | // statically inserted kernel-tracepoint derived probes | |
10134 | // ------------------------------------------------------------------------ | |
10135 | ||
6fb70fb7 | 10136 | struct tracepoint_arg |
79189b84 | 10137 | { |
ad370dcc | 10138 | string name, c_type, typecast; |
dcaa1a65 | 10139 | bool usable, used, isptr; |
f8a968bc | 10140 | Dwarf_Die type_die; |
dcaa1a65 | 10141 | tracepoint_arg(): usable(false), used(false), isptr(false) {} |
6fb70fb7 | 10142 | }; |
79189b84 | 10143 | |
0a6f5a3f JS |
10144 | struct tracepoint_derived_probe: public derived_probe |
10145 | { | |
79189b84 JS |
10146 | tracepoint_derived_probe (systemtap_session& s, |
10147 | dwflpp& dw, Dwarf_Die& func_die, | |
10148 | const string& tracepoint_name, | |
10149 | probe* base_probe, probe_point* location); | |
bc9a523d | 10150 | |
79189b84 | 10151 | systemtap_session& sess; |
6fb70fb7 JS |
10152 | string tracepoint_name, header; |
10153 | vector <struct tracepoint_arg> args; | |
bc9a523d | 10154 | |
6fb70fb7 | 10155 | void build_args(dwflpp& dw, Dwarf_Die& func_die); |
d0bfd2ac | 10156 | void getargs (std::list<std::string> &arg_set) const; |
79189b84 | 10157 | void join_group (systemtap_session& s); |
3e3bd7b6 | 10158 | void print_dupe_stamp(ostream& o); |
0a6f5a3f | 10159 | }; |
79189b84 JS |
10160 | |
10161 | ||
0a6f5a3f | 10162 | struct tracepoint_derived_probe_group: public generic_dpg<tracepoint_derived_probe> |
79189b84 | 10163 | { |
79189b84 JS |
10164 | void emit_module_decls (systemtap_session& s); |
10165 | void emit_module_init (systemtap_session& s); | |
10166 | void emit_module_exit (systemtap_session& s); | |
0a6f5a3f | 10167 | }; |
79189b84 | 10168 | |
bc9a523d | 10169 | |
f8a968bc JS |
10170 | struct tracepoint_var_expanding_visitor: public var_expanding_visitor |
10171 | { | |
10172 | tracepoint_var_expanding_visitor(dwflpp& dw, const string& probe_name, | |
10173 | vector <struct tracepoint_arg>& args): | |
10174 | dw (dw), probe_name (probe_name), args (args) {} | |
10175 | dwflpp& dw; | |
10176 | const string& probe_name; | |
10177 | vector <struct tracepoint_arg>& args; | |
bc9a523d | 10178 | |
f8a968bc JS |
10179 | void visit_target_symbol (target_symbol* e); |
10180 | void visit_target_symbol_arg (target_symbol* e); | |
10181 | void visit_target_symbol_context (target_symbol* e); | |
10182 | }; | |
79189b84 JS |
10183 | |
10184 | ||
f8a968bc JS |
10185 | void |
10186 | tracepoint_var_expanding_visitor::visit_target_symbol_arg (target_symbol* e) | |
75ead1f7 | 10187 | { |
cc9001af | 10188 | string argname = e->sym_name(); |
75ead1f7 | 10189 | |
f8a968bc JS |
10190 | // search for a tracepoint parameter matching this name |
10191 | tracepoint_arg *arg = NULL; | |
10192 | for (unsigned i = 0; i < args.size(); ++i) | |
dcaa1a65 | 10193 | if (args[i].usable && args[i].name == argname) |
f8a968bc JS |
10194 | { |
10195 | arg = &args[i]; | |
10196 | arg->used = true; | |
10197 | break; | |
10198 | } | |
75ead1f7 | 10199 | |
f8a968bc JS |
10200 | if (arg == NULL) |
10201 | { | |
1d0499c2 | 10202 | set<string> vars; |
f8a968bc | 10203 | for (unsigned i = 0; i < args.size(); ++i) |
1d0499c2 JL |
10204 | vars.insert("$" + args[i].name); |
10205 | vars.insert("$$name"); | |
10206 | vars.insert("$$parms"); | |
10207 | vars.insert("$$vars"); | |
10208 | string sugs = levenshtein_suggest(e->name, vars); // no need to limit, there's not that many | |
75ead1f7 | 10209 | |
f8a968bc JS |
10210 | // We hope that this value ends up not being referenced after all, so it |
10211 | // can be optimized out quietly. | |
1d0499c2 JL |
10212 | throw SEMANTIC_ERROR(_F("unable to find tracepoint variable '%s'%s", |
10213 | e->name.c_str(), sugs.empty() ? "" : | |
10214 | (_(" (alternatives: ") + sugs + ")").c_str()), e->tok); | |
10215 | // NB: we use 'alternatives' because we list all | |
f8a968bc JS |
10216 | // NB: we can have multiple errors, since a target variable |
10217 | // may be expanded in several different contexts: | |
10218 | // trace ("*") { $foo->bar } | |
f8a968bc | 10219 | } |
75ead1f7 | 10220 | |
f8a968bc | 10221 | // make sure we're not dereferencing base types |
dc5a09fc | 10222 | if (!arg->isptr) |
d19a9a82 | 10223 | e->assert_no_components("tracepoint", true); |
75ead1f7 | 10224 | |
f8a968bc JS |
10225 | // we can only write to dereferenced fields, and only if guru mode is on |
10226 | bool lvalue = is_active_lvalue(e); | |
10227 | if (lvalue && (!dw.sess.guru_mode || e->components.empty())) | |
dc09353a | 10228 | throw SEMANTIC_ERROR(_F("write to tracepoint variable '%s' not permitted; need stap -g", e->name.c_str()), e->tok); |
c69a87e0 | 10229 | |
ad370dcc JS |
10230 | // XXX: if a struct/union arg is passed by value, then writing to its fields |
10231 | // is also meaningless until you dereference past a pointer member. It's | |
10232 | // harder to detect and prevent that though... | |
75ead1f7 | 10233 | |
f8a968bc JS |
10234 | if (e->components.empty()) |
10235 | { | |
03c75a4a | 10236 | if (e->addressof) |
dc09353a | 10237 | throw SEMANTIC_ERROR(_("cannot take address of tracepoint variable"), e->tok); |
a45664f4 | 10238 | |
3e3bd7b6 | 10239 | // Just grab the value from the probe locals |
a45664f4 JS |
10240 | symbol* sym = new symbol; |
10241 | sym->tok = e->tok; | |
10242 | sym->name = "__tracepoint_arg_" + arg->name; | |
10243 | provide (sym); | |
f8a968bc JS |
10244 | } |
10245 | else | |
10246 | { | |
5f36109e JS |
10247 | // make a copy of the original as a bare target symbol for the tracepoint |
10248 | // value, which will be passed into the dwarf dereferencing code | |
10249 | target_symbol* e2 = deep_copy_visitor::deep_copy(e); | |
10250 | e2->components.clear(); | |
10251 | ||
10252 | if (e->components.back().type == target_symbol::comp_pretty_print) | |
10253 | { | |
10254 | if (lvalue) | |
dc09353a | 10255 | throw SEMANTIC_ERROR(_("cannot write to pretty-printed variable"), e->tok); |
5f36109e | 10256 | |
d19a9a82 | 10257 | dwarf_pretty_print dpp(dw, &arg->type_die, e2, arg->isptr, false, *e); |
5f36109e JS |
10258 | dpp.expand()->visit (this); |
10259 | return; | |
10260 | } | |
10261 | ||
1c0be8c7 | 10262 | bool userspace_p = false; |
f8a968bc | 10263 | string fname = (string(lvalue ? "_tracepoint_tvar_set" : "_tracepoint_tvar_get") |
cc9001af | 10264 | + "_" + e->sym_name() |
aca66a36 | 10265 | + "_" + lex_cast(tick++)); |
75ead1f7 | 10266 | |
1c0be8c7 JS |
10267 | exp_type type = pe_long; |
10268 | string code = dw.literal_stmt_for_pointer (&arg->type_die, e, lvalue, type); | |
6fda2dff | 10269 | |
1c0be8c7 JS |
10270 | functioncall* n = synthetic_embedded_deref_call(dw.sess, fname, code, type, |
10271 | userspace_p, lvalue, e, e2); | |
75ead1f7 | 10272 | |
f8a968bc JS |
10273 | if (lvalue) |
10274 | { | |
10275 | // Provide the functioncall to our parent, so that it can be | |
10276 | // used to substitute for the assignment node immediately above | |
10277 | // us. | |
10278 | assert(!target_symbol_setter_functioncalls.empty()); | |
10279 | *(target_symbol_setter_functioncalls.top()) = n; | |
10280 | } | |
75ead1f7 | 10281 | |
1c0be8c7 JS |
10282 | // Revisit the functioncall so arguments can be expanded. |
10283 | n->visit (this); | |
f8a968bc | 10284 | } |
75ead1f7 JS |
10285 | } |
10286 | ||
10287 | ||
f8a968bc JS |
10288 | void |
10289 | tracepoint_var_expanding_visitor::visit_target_symbol_context (target_symbol* e) | |
0a6f5a3f | 10290 | { |
03c75a4a | 10291 | if (e->addressof) |
dc09353a | 10292 | throw SEMANTIC_ERROR(_("cannot take address of context variable"), e->tok); |
03c75a4a | 10293 | |
f8a968bc | 10294 | if (is_active_lvalue (e)) |
dc09353a | 10295 | throw SEMANTIC_ERROR(_F("write to tracepoint '%s' not permitted", e->name.c_str()), e->tok); |
0a6f5a3f | 10296 | |
277c21bc | 10297 | if (e->name == "$$name") |
f8a968bc | 10298 | { |
5f36109e JS |
10299 | e->assert_no_components("tracepoint"); |
10300 | ||
bfdaad1e DS |
10301 | // Synthesize an embedded expression. |
10302 | embedded_expr *expr = new embedded_expr; | |
10303 | expr->tok = e->tok; | |
10304 | expr->code = string("/* string */ /* pure */ ") | |
6dceb5c9 | 10305 | + string("c->ips.tracepoint_name ? c->ips.tracepoint_name : \"\""); |
bfdaad1e | 10306 | provide (expr); |
f8a968bc | 10307 | } |
277c21bc | 10308 | else if (e->name == "$$vars" || e->name == "$$parms") |
f8a968bc | 10309 | { |
5f36109e JS |
10310 | e->assert_no_components("tracepoint", true); |
10311 | ||
1c922ad7 | 10312 | print_format* pf = print_format::create(e->tok, "sprintf"); |
0a6f5a3f | 10313 | |
f8a968bc | 10314 | for (unsigned i = 0; i < args.size(); ++i) |
b278033a | 10315 | { |
dcaa1a65 JS |
10316 | if (!args[i].usable) |
10317 | continue; | |
f8a968bc JS |
10318 | if (i > 0) |
10319 | pf->raw_components += " "; | |
10320 | pf->raw_components += args[i].name; | |
3e3bd7b6 | 10321 | target_symbol *tsym = new target_symbol; |
f8a968bc | 10322 | tsym->tok = e->tok; |
277c21bc | 10323 | tsym->name = "$" + args[i].name; |
5f36109e | 10324 | tsym->components = e->components; |
b278033a | 10325 | |
f8a968bc JS |
10326 | // every variable should always be accessible! |
10327 | tsym->saved_conversion_error = 0; | |
8c2f50c0 | 10328 | expression *texp = require<expression> (tsym); // NB: throws nothing ... |
14a97852 JS |
10329 | if (tsym->saved_conversion_error) // ... but this is how we know it happened. |
10330 | { | |
10331 | if (dw.sess.verbose>2) | |
e26c2f83 | 10332 | for (const semantic_error *c = tsym->saved_conversion_error; |
c081af73 | 10333 | c != 0; c = c->get_chain()) |
4c5d9906 | 10334 | clog << _("variable location problem [man error::dwarf]: ") << c->what() << endl; |
14a97852 JS |
10335 | pf->raw_components += "=?"; |
10336 | continue; | |
10337 | } | |
b278033a | 10338 | |
5f36109e JS |
10339 | if (!e->components.empty() && |
10340 | e->components[0].type == target_symbol::comp_pretty_print) | |
10341 | pf->raw_components += "=%s"; | |
10342 | else | |
10343 | pf->raw_components += args[i].isptr ? "=%p" : "=%#x"; | |
f8a968bc JS |
10344 | pf->args.push_back(texp); |
10345 | } | |
0a6f5a3f | 10346 | |
f8a968bc JS |
10347 | pf->components = print_format::string_to_components(pf->raw_components); |
10348 | provide (pf); | |
b278033a | 10349 | } |
f8a968bc JS |
10350 | else |
10351 | assert(0); // shouldn't get here | |
0a6f5a3f JS |
10352 | } |
10353 | ||
0a6f5a3f | 10354 | void |
f8a968bc | 10355 | tracepoint_var_expanding_visitor::visit_target_symbol (target_symbol* e) |
0a6f5a3f | 10356 | { |
aff5d390 | 10357 | try |
c69a87e0 | 10358 | { |
bd1fcbad | 10359 | assert(e->name.size() > 0 && e->name[0] == '$'); |
aff5d390 | 10360 | |
277c21bc | 10361 | if (e->name == "$$name" || e->name == "$$parms" || e->name == "$$vars") |
c69a87e0 | 10362 | visit_target_symbol_context (e); |
bd1fcbad | 10363 | |
c69a87e0 FCE |
10364 | else |
10365 | visit_target_symbol_arg (e); | |
10366 | } | |
10367 | catch (const semantic_error &er) | |
10368 | { | |
1af1e62d | 10369 | e->chain (er); |
c69a87e0 FCE |
10370 | provide (e); |
10371 | } | |
0a6f5a3f JS |
10372 | } |
10373 | ||
10374 | ||
79189b84 JS |
10375 | tracepoint_derived_probe::tracepoint_derived_probe (systemtap_session& s, |
10376 | dwflpp& dw, Dwarf_Die& func_die, | |
10377 | const string& tracepoint_name, | |
10378 | probe* base, probe_point* loc): | |
4c5d1300 | 10379 | derived_probe (base, loc, true /* .components soon rewritten */), |
79189b84 | 10380 | sess (s), tracepoint_name (tracepoint_name) |
56894e91 | 10381 | { |
79189b84 JS |
10382 | // create synthetic probe point name; preserve condition |
10383 | vector<probe_point::component*> comps; | |
10384 | comps.push_back (new probe_point::component (TOK_KERNEL)); | |
10385 | comps.push_back (new probe_point::component (TOK_TRACE, new literal_string (tracepoint_name))); | |
10386 | this->sole_location()->components = comps; | |
10387 | ||
6fb70fb7 JS |
10388 | // fill out the available arguments in this tracepoint |
10389 | build_args(dw, func_die); | |
56894e91 | 10390 | |
6fb70fb7 JS |
10391 | // determine which header defined this tracepoint |
10392 | string decl_file = dwarf_decl_file(&func_die); | |
b78a0fbb | 10393 | header = decl_file; |
d4393459 FCE |
10394 | |
10395 | #if 0 /* This convention is not enforced. */ | |
6fb70fb7 JS |
10396 | size_t header_pos = decl_file.rfind("trace/"); |
10397 | if (header_pos == string::npos) | |
dc09353a | 10398 | throw SEMANTIC_ERROR ("cannot parse header location for tracepoint '" |
6fb70fb7 JS |
10399 | + tracepoint_name + "' in '" |
10400 | + decl_file + "'"); | |
10401 | header = decl_file.substr(header_pos); | |
d4393459 | 10402 | #endif |
56894e91 | 10403 | |
6fb70fb7 JS |
10404 | // tracepoints from FOO_event_types.h should really be included from FOO.h |
10405 | // XXX can dwarf tell us the include hierarchy? it would be better to | |
10406 | // ... walk up to see which one was directly included by tracequery.c | |
3c1b3d06 | 10407 | // XXX: see also PR9993. |
d4393459 | 10408 | size_t header_pos = header.find("_event_types"); |
6fb70fb7 JS |
10409 | if (header_pos != string::npos) |
10410 | header.erase(header_pos, 12); | |
56894e91 | 10411 | |
f8a968bc JS |
10412 | // Now expand the local variables in the probe body |
10413 | tracepoint_var_expanding_visitor v (dw, name, args); | |
8b095b45 | 10414 | v.replace (this->body); |
a45664f4 JS |
10415 | for (unsigned i = 0; i < args.size(); i++) |
10416 | if (args[i].used) | |
10417 | { | |
10418 | vardecl* v = new vardecl; | |
10419 | v->name = "__tracepoint_arg_" + args[i].name; | |
10420 | v->tok = this->tok; | |
58701b78 | 10421 | v->set_arity(0, this->tok); |
a45664f4 | 10422 | v->type = pe_long; |
69aa668e | 10423 | v->synthetic = true; |
a45664f4 JS |
10424 | this->locals.push_back (v); |
10425 | } | |
56894e91 | 10426 | |
79189b84 | 10427 | if (sess.verbose > 2) |
ce0f6648 | 10428 | clog << "tracepoint-based " << name << " tracepoint='" << tracepoint_name << "'" << endl; |
79189b84 | 10429 | } |
dc38c0ae | 10430 | |
56894e91 | 10431 | |
f8a968bc | 10432 | static bool |
dcaa1a65 | 10433 | resolve_tracepoint_arg_type(tracepoint_arg& arg) |
46b84a80 | 10434 | { |
d19a9a82 | 10435 | Dwarf_Die type; |
dcaa1a65 | 10436 | switch (dwarf_tag(&arg.type_die)) |
b20febf3 | 10437 | { |
f8a968bc JS |
10438 | case DW_TAG_typedef: |
10439 | case DW_TAG_const_type: | |
10440 | case DW_TAG_volatile_type: | |
c69af88f | 10441 | case DW_TAG_restrict_type: |
f8a968bc | 10442 | // iterate on the referent type |
3d1ad340 | 10443 | return (dwarf_attr_die(&arg.type_die, DW_AT_type, &arg.type_die) |
dcaa1a65 | 10444 | && resolve_tracepoint_arg_type(arg)); |
f8a968bc | 10445 | case DW_TAG_base_type: |
a52d2ac0 | 10446 | case DW_TAG_enumeration_type: |
f8a968bc | 10447 | // base types will simply be treated as script longs |
dcaa1a65 | 10448 | arg.isptr = false; |
f8a968bc JS |
10449 | return true; |
10450 | case DW_TAG_pointer_type: | |
dcaa1a65 JS |
10451 | // pointers can be treated as script longs, |
10452 | // and if we know their type, they can also be dereferenced | |
d19a9a82 JS |
10453 | type = arg.type_die; |
10454 | while (dwarf_attr_die(&arg.type_die, DW_AT_type, &arg.type_die)) | |
10455 | { | |
10456 | // It still might be a non-type, e.g. const void, | |
10457 | // so we need to strip away all qualifiers. | |
10458 | int tag = dwarf_tag(&arg.type_die); | |
10459 | if (tag != DW_TAG_typedef && | |
10460 | tag != DW_TAG_const_type && | |
c69af88f MW |
10461 | tag != DW_TAG_volatile_type && |
10462 | tag != DW_TAG_restrict_type) | |
d19a9a82 JS |
10463 | { |
10464 | arg.isptr = true; | |
10465 | break; | |
10466 | } | |
10467 | } | |
10468 | if (!arg.isptr) | |
10469 | arg.type_die = type; | |
ad370dcc JS |
10470 | arg.typecast = "(intptr_t)"; |
10471 | return true; | |
10472 | case DW_TAG_structure_type: | |
10473 | case DW_TAG_union_type: | |
10474 | // for structs/unions which are passed by value, we turn it into | |
10475 | // a pointer that can be dereferenced. | |
10476 | arg.isptr = true; | |
10477 | arg.typecast = "(intptr_t)&"; | |
dcaa1a65 | 10478 | return true; |
f8a968bc JS |
10479 | default: |
10480 | // should we consider other types too? | |
10481 | return false; | |
b20febf3 | 10482 | } |
56894e91 JS |
10483 | } |
10484 | ||
10485 | ||
10486 | void | |
822a6a3d | 10487 | tracepoint_derived_probe::build_args(dwflpp&, Dwarf_Die& func_die) |
56894e91 | 10488 | { |
6fb70fb7 JS |
10489 | Dwarf_Die arg; |
10490 | if (dwarf_child(&func_die, &arg) == 0) | |
10491 | do | |
10492 | if (dwarf_tag(&arg) == DW_TAG_formal_parameter) | |
10493 | { | |
10494 | // build a tracepoint_arg for this parameter | |
10495 | tracepoint_arg tparg; | |
c60517ca | 10496 | tparg.name = dwarf_diename(&arg) ?: ""; |
56894e91 | 10497 | |
6fb70fb7 | 10498 | // read the type of this parameter |
3d1ad340 | 10499 | if (!dwarf_attr_die (&arg, DW_AT_type, &tparg.type_die) |
f1c8f8a5 | 10500 | || !dwarf_type_name(&tparg.type_die, tparg.c_type)) |
dc09353a | 10501 | throw SEMANTIC_ERROR (_F("cannot get type of parameter '%s' of tracepoint '%s'", |
ce0f6648 | 10502 | tparg.name.c_str(), tracepoint_name.c_str())); |
a68f81a2 | 10503 | |
dcaa1a65 | 10504 | tparg.usable = resolve_tracepoint_arg_type(tparg); |
6fb70fb7 JS |
10505 | args.push_back(tparg); |
10506 | if (sess.verbose > 4) | |
a52d2ac0 JS |
10507 | clog << _F("found parameter for tracepoint '%s': type:'%s' name:'%s' %s", |
10508 | tracepoint_name.c_str(), tparg.c_type.c_str(), tparg.name.c_str(), | |
10509 | tparg.usable ? "ok" : "unavailable") << endl; | |
6fb70fb7 JS |
10510 | } |
10511 | while (dwarf_siblingof(&arg, &arg) == 0); | |
56894e91 JS |
10512 | } |
10513 | ||
dc38c0ae | 10514 | void |
d0bfd2ac | 10515 | tracepoint_derived_probe::getargs(std::list<std::string> &arg_set) const |
dc38c0ae | 10516 | { |
dcaa1a65 JS |
10517 | for (unsigned i = 0; i < args.size(); ++i) |
10518 | if (args[i].usable) | |
d0bfd2ac | 10519 | arg_set.push_back("$"+args[i].name+":"+args[i].c_type); |
dc38c0ae DS |
10520 | } |
10521 | ||
79189b84 JS |
10522 | void |
10523 | tracepoint_derived_probe::join_group (systemtap_session& s) | |
197a4d62 | 10524 | { |
79189b84 JS |
10525 | if (! s.tracepoint_derived_probes) |
10526 | s.tracepoint_derived_probes = new tracepoint_derived_probe_group (); | |
10527 | s.tracepoint_derived_probes->enroll (this); | |
10528 | } | |
e38d6504 | 10529 | |
56894e91 | 10530 | |
197a4d62 | 10531 | void |
3e3bd7b6 | 10532 | tracepoint_derived_probe::print_dupe_stamp(ostream& o) |
56894e91 | 10533 | { |
3e3bd7b6 JS |
10534 | for (unsigned i = 0; i < args.size(); i++) |
10535 | if (args[i].used) | |
10536 | o << "__tracepoint_arg_" << args[i].name << endl; | |
197a4d62 | 10537 | } |
56894e91 | 10538 | |
3e3bd7b6 | 10539 | |
c9ccb642 | 10540 | static vector<string> tracepoint_extra_decls (systemtap_session& s, const string& header) |
47dd066d | 10541 | { |
3c1b3d06 FCE |
10542 | vector<string> they_live; |
10543 | // PR 9993 | |
10544 | // XXX: may need this to be configurable | |
d4393459 | 10545 | they_live.push_back ("#include <linux/skbuff.h>"); |
9e0cd21a FCE |
10546 | |
10547 | // PR11649: conditional extra header | |
10548 | // for kvm tracepoints in 2.6.33ish | |
10549 | if (s.kernel_config["CONFIG_KVM"] != string("")) { | |
d4393459 FCE |
10550 | they_live.push_back ("#include <linux/kvm_host.h>"); |
10551 | } | |
10552 | ||
50b72692 | 10553 | if (header.find("xfs") != string::npos && s.kernel_config["CONFIG_XFS_FS"] != string("")) { |
d4393459 | 10554 | they_live.push_back ("#define XFS_BIG_BLKNOS 1"); |
88637c31 FCE |
10555 | if (s.kernel_source_tree != "") |
10556 | they_live.push_back ("#include \"fs/xfs/xfs_types.h\""); // in kernel-source tree | |
d4393459 FCE |
10557 | they_live.push_back ("struct xfs_mount;"); |
10558 | they_live.push_back ("struct xfs_inode;"); | |
10559 | they_live.push_back ("struct xfs_buf;"); | |
10560 | they_live.push_back ("struct xfs_bmbt_irec;"); | |
c2cf1b87 | 10561 | they_live.push_back ("struct xfs_trans;"); |
9e0cd21a | 10562 | } |
d4393459 | 10563 | |
50b72692 | 10564 | if (header.find("nfs") != string::npos && s.kernel_config["CONFIG_NFSD"] != string("")) { |
d4393459 FCE |
10565 | they_live.push_back ("struct rpc_task;"); |
10566 | } | |
b64d65e2 FCE |
10567 | // RHEL6.3 |
10568 | if (header.find("rpc") != string::npos && s.kernel_config["CONFIG_NFSD"] != string("")) { | |
10569 | they_live.push_back ("struct rpc_clnt;"); | |
10570 | they_live.push_back ("struct rpc_wait_queue;"); | |
10571 | } | |
d4393459 FCE |
10572 | |
10573 | they_live.push_back ("#include <asm/cputime.h>"); | |
10574 | ||
c2cf1b87 FCE |
10575 | // linux 3.0 |
10576 | they_live.push_back ("struct cpu_workqueue_struct;"); | |
10577 | ||
50b72692 | 10578 | if (header.find("ext4") != string::npos && s.kernel_config["CONFIG_EXT4_FS"] != string("")) |
c2cf1b87 FCE |
10579 | if (s.kernel_source_tree != "") |
10580 | they_live.push_back ("#include \"fs/ext4/ext4.h\""); // in kernel-source tree | |
10581 | ||
d97d428e | 10582 | if (header.find("ext3") != string::npos) |
50b72692 HP |
10583 | they_live.push_back ("struct ext3_reserve_window_node;"); |
10584 | ||
d97d428e FCE |
10585 | if (header.find("workqueue") != string::npos) |
10586 | { | |
10587 | they_live.push_back ("struct pool_workqueue;"); | |
10588 | they_live.push_back ("struct work_struct;"); | |
10589 | } | |
10590 | ||
10591 | if (header.find("asoc") != string::npos) | |
10592 | they_live.push_back ("struct snd_soc_dapm_path;"); | |
10593 | ||
10594 | if (header.find("9p") != string::npos) | |
10595 | { | |
10596 | they_live.push_back ("struct p9_client;"); | |
10597 | they_live.push_back ("struct p9_fcall;"); | |
10598 | } | |
10599 | ||
10600 | if (header.find("bcache") != string::npos) | |
10601 | { | |
10602 | they_live.push_back ("struct bkey;"); | |
10603 | they_live.push_back ("struct btree;"); | |
10604 | they_live.push_back ("struct cache_set;"); | |
10605 | they_live.push_back ("struct cache;"); | |
10606 | } | |
10607 | ||
10608 | if (header.find("f2fs") != string::npos) | |
10609 | { | |
10610 | // cannot get fs/f2fs/f2fs.h #included | |
10611 | they_live.push_back ("typedef u32 block_t;"); | |
10612 | they_live.push_back ("typedef u32 nid_t;"); | |
10613 | } | |
10614 | ||
10615 | if (header.find("radeon") != string::npos) | |
10616 | they_live.push_back ("struct radeon_bo;"); | |
10617 | ||
10618 | // argh, 3.11, i915_trace.h -> i915_drv.h -> i915_reg.h without -I | |
10619 | // also brcms_trace_events.h -> ... -> "types.h" | |
10620 | // XXX: need a way to add a temporary -I flag | |
10621 | ||
10622 | if (header.find("/ath/") != string::npos) | |
10623 | they_live.push_back ("struct ath5k_hw;"); | |
10624 | ||
10625 | ||
3c1b3d06 FCE |
10626 | return they_live; |
10627 | } | |
47dd066d WC |
10628 | |
10629 | ||
10630 | void | |
79189b84 | 10631 | tracepoint_derived_probe_group::emit_module_decls (systemtap_session& s) |
47dd066d | 10632 | { |
79189b84 JS |
10633 | if (probes.empty()) |
10634 | return; | |
47dd066d | 10635 | |
96b030fe | 10636 | s.op->newline() << "/* ---- tracepoint probes ---- */"; |
3ef9830a | 10637 | s.op->newline() << "#include <linux/stp_tracepoint.h>" << endl; |
96b030fe | 10638 | s.op->newline(); |
79189b84 | 10639 | |
47dd066d | 10640 | |
a4b9c3b3 FCE |
10641 | // We create a MODULE_aux_N.c file for each tracepoint header, to allow them |
10642 | // to be separately compiled. That's because kernel tracepoint headers sometimes | |
10643 | // conflict. PR13155. | |
10644 | ||
10645 | map<string,translator_output*> per_header_aux; | |
10646 | // GC NB: the translator_output* structs are owned/retained by the systemtap_session. | |
47dd066d | 10647 | |
6fb70fb7 JS |
10648 | for (unsigned i = 0; i < probes.size(); ++i) |
10649 | { | |
10650 | tracepoint_derived_probe *p = probes[i]; | |
75ae2ec9 | 10651 | string header = p->header; |
5f73a260 | 10652 | |
a4b9c3b3 FCE |
10653 | // We cache the auxiliary output files on a per-header basis. We don't |
10654 | // need one aux file per tracepoint, only one per tracepoint-header. | |
10655 | translator_output *tpop = per_header_aux[header]; | |
10656 | if (tpop == 0) | |
10657 | { | |
10658 | tpop = s.op_create_auxiliary(); | |
10659 | per_header_aux[header] = tpop; | |
10660 | ||
10661 | // PR9993: Add extra headers to work around undeclared types in individual | |
10662 | // include/trace/foo.h files | |
10663 | const vector<string>& extra_decls = tracepoint_extra_decls (s, header); | |
10664 | for (unsigned z=0; z<extra_decls.size(); z++) | |
10665 | tpop->newline() << extra_decls[z] << "\n"; | |
720c435f | 10666 | |
a4b9c3b3 FCE |
10667 | // strip include/ substring, the same way as done in get_tracequery_module() |
10668 | size_t root_pos = header.rfind("include/"); | |
10669 | header = ((root_pos != string::npos) ? header.substr(root_pos + 8) : header); | |
bfffa443 | 10670 | |
3ef9830a | 10671 | tpop->newline() << "#include <linux/stp_tracepoint.h>" << endl; |
a4b9c3b3 | 10672 | tpop->newline() << "#include <" << header << ">"; |
a4b9c3b3 FCE |
10673 | } |
10674 | ||
720c435f JS |
10675 | // collect the args that are actually in use |
10676 | vector<const tracepoint_arg*> used_args; | |
6fb70fb7 | 10677 | for (unsigned j = 0; j < p->args.size(); ++j) |
720c435f JS |
10678 | if (p->args[j].used) |
10679 | used_args.push_back(&p->args[j]); | |
10680 | ||
3ef9830a JS |
10681 | // forward-declare the generated-side tracepoint callback, and define the |
10682 | // generated-side tracepoint callback in the main translator-output | |
10683 | string enter_real_fn = "enter_real_tracepoint_probe_" + lex_cast(i); | |
720c435f | 10684 | if (used_args.empty()) |
6fb70fb7 | 10685 | { |
3ef9830a JS |
10686 | tpop->newline() << "STP_TRACE_ENTER_REAL_NOARGS(" << enter_real_fn << ");"; |
10687 | s.op->newline() << "STP_TRACE_ENTER_REAL_NOARGS(" << enter_real_fn << ")"; | |
6fb70fb7 | 10688 | } |
3ef9830a | 10689 | else |
a4b9c3b3 | 10690 | { |
3ef9830a JS |
10691 | tpop->newline() << "STP_TRACE_ENTER_REAL(" << enter_real_fn; |
10692 | s.op->newline() << "STP_TRACE_ENTER_REAL(" << enter_real_fn; | |
10693 | s.op->indent(2); | |
10694 | for (unsigned j = 0; j < used_args.size(); ++j) | |
10695 | { | |
10696 | tpop->line() << ", int64_t"; | |
10697 | s.op->newline() << ", int64_t __tracepoint_arg_" << used_args[j]->name; | |
10698 | } | |
10699 | tpop->line() << ");"; | |
10700 | s.op->newline() << ")"; | |
10701 | s.op->indent(-2); | |
6fb70fb7 | 10702 | } |
3ef9830a | 10703 | s.op->newline() << "{"; |
7c3e97f4 | 10704 | s.op->newline(1) << "const struct stap_probe * const probe = " |
faea5e16 | 10705 | << common_probe_init (p) << ";"; |
71db462b | 10706 | common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "probe", |
cda141c2 | 10707 | "stp_probe_type_tracepoint"); |
6dceb5c9 | 10708 | s.op->newline() << "c->ips.tracepoint_name = " |
c12d974f FCE |
10709 | << lex_cast_qstring (p->tracepoint_name) |
10710 | << ";"; | |
720c435f JS |
10711 | for (unsigned j = 0; j < used_args.size(); ++j) |
10712 | { | |
10713 | s.op->newline() << "c->probe_locals." << p->name | |
0386bbcf | 10714 | << "." + s.up->c_localname("__tracepoint_arg_" + used_args[j]->name) |
720c435f JS |
10715 | << " = __tracepoint_arg_" << used_args[j]->name << ";"; |
10716 | } | |
26e63673 | 10717 | s.op->newline() << "(*probe->ph) (c);"; |
f887a8c9 | 10718 | common_probe_entryfn_epilogue (s, true); |
6fb70fb7 | 10719 | s.op->newline(-1) << "}"; |
47dd066d | 10720 | |
a4b9c3b3 | 10721 | // define the real tracepoint callback function |
3ef9830a JS |
10722 | string enter_fn = "enter_tracepoint_probe_" + lex_cast(i); |
10723 | if (p->args.empty()) | |
10724 | tpop->newline() << "static STP_TRACE_ENTER_NOARGS(" << enter_fn << ")"; | |
10725 | else | |
a4b9c3b3 | 10726 | { |
3ef9830a JS |
10727 | tpop->newline() << "static STP_TRACE_ENTER(" << enter_fn; |
10728 | s.op->indent(2); | |
10729 | for (unsigned j = 0; j < p->args.size(); ++j) | |
10730 | { | |
10731 | tpop->newline() << ", " << p->args[j].c_type | |
10732 | << " __tracepoint_arg_" << p->args[j].name; | |
10733 | } | |
10734 | tpop->newline() << ")"; | |
10735 | s.op->indent(-2); | |
a4b9c3b3 | 10736 | } |
3ef9830a JS |
10737 | tpop->newline() << "{"; |
10738 | tpop->newline(1) << enter_real_fn << "("; | |
720c435f JS |
10739 | tpop->indent(2); |
10740 | for (unsigned j = 0; j < used_args.size(); ++j) | |
10741 | { | |
10742 | if (j > 0) | |
10743 | tpop->line() << ", "; | |
10744 | tpop->newline() << "(int64_t)" << used_args[j]->typecast | |
10745 | << "__tracepoint_arg_" << used_args[j]->name; | |
10746 | } | |
10747 | tpop->newline() << ");"; | |
10748 | tpop->newline(-3) << "}"; | |
a4b9c3b3 FCE |
10749 | |
10750 | ||
96b030fe | 10751 | // emit normalized registration functions |
720c435f | 10752 | tpop->newline() << "int register_tracepoint_probe_" << i << "(void) {"; |
3ef9830a JS |
10753 | tpop->newline(1) << "return STP_TRACE_REGISTER(" << p->tracepoint_name |
10754 | << ", " << enter_fn << ");"; | |
a4b9c3b3 | 10755 | tpop->newline(-1) << "}"; |
47dd066d | 10756 | |
86758d5f JS |
10757 | // NB: we're not prepared to deal with unreg failures. However, failures |
10758 | // can only occur if the tracepoint doesn't exist (yet?), or if we | |
10759 | // weren't even registered. The former should be OKed by the initial | |
10760 | // registration call, and the latter is safe to ignore. | |
720c435f | 10761 | tpop->newline() << "void unregister_tracepoint_probe_" << i << "(void) {"; |
3ef9830a JS |
10762 | tpop->newline(1) << "(void) STP_TRACE_UNREGISTER(" << p->tracepoint_name |
10763 | << ", " << enter_fn << ");"; | |
a4b9c3b3 FCE |
10764 | tpop->newline(-1) << "}"; |
10765 | tpop->newline(); | |
5f73a260 | 10766 | |
720c435f JS |
10767 | // declare normalized registration functions |
10768 | s.op->newline() << "int register_tracepoint_probe_" << i << "(void);"; | |
10769 | s.op->newline() << "void unregister_tracepoint_probe_" << i << "(void);"; | |
5f73a260 | 10770 | |
a4b9c3b3 | 10771 | tpop->assert_0_indent(); |
af304783 DS |
10772 | } |
10773 | ||
96b030fe JS |
10774 | // emit an array of registration functions for easy init/shutdown |
10775 | s.op->newline() << "static struct stap_tracepoint_probe {"; | |
10776 | s.op->newline(1) << "int (*reg)(void);"; | |
86758d5f | 10777 | s.op->newline(0) << "void (*unreg)(void);"; |
96b030fe JS |
10778 | s.op->newline(-1) << "} stap_tracepoint_probes[] = {"; |
10779 | s.op->indent(1); | |
10780 | for (unsigned i = 0; i < probes.size(); ++i) | |
10781 | { | |
10782 | s.op->newline () << "{"; | |
10783 | s.op->line() << " .reg=®ister_tracepoint_probe_" << i << ","; | |
10784 | s.op->line() << " .unreg=&unregister_tracepoint_probe_" << i; | |
10785 | s.op->line() << " },"; | |
10786 | } | |
10787 | s.op->newline(-1) << "};"; | |
10788 | s.op->newline(); | |
47dd066d WC |
10789 | } |
10790 | ||
10791 | ||
79189b84 JS |
10792 | void |
10793 | tracepoint_derived_probe_group::emit_module_init (systemtap_session &s) | |
47dd066d | 10794 | { |
79189b84 JS |
10795 | if (probes.size () == 0) |
10796 | return; | |
47dd066d | 10797 | |
79189b84 | 10798 | s.op->newline() << "/* init tracepoint probes */"; |
96b030fe JS |
10799 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++) {"; |
10800 | s.op->newline(1) << "rc = stap_tracepoint_probes[i].reg();"; | |
10801 | s.op->newline() << "if (rc) {"; | |
10802 | s.op->newline(1) << "for (j=i-1; j>=0; j--)"; // partial rollback | |
10803 | s.op->newline(1) << "stap_tracepoint_probes[j].unreg();"; | |
10804 | s.op->newline(-1) << "break;"; // don't attempt to register any more probes | |
10805 | s.op->newline(-1) << "}"; | |
10806 | s.op->newline(-1) << "}"; | |
47dd066d | 10807 | |
bc9a523d FCE |
10808 | // This would be technically proper (on those autoconf-detectable |
10809 | // kernels that include this function in tracepoint.h), however we | |
10810 | // already make several calls to synchronze_sched() during our | |
10811 | // shutdown processes. | |
47dd066d | 10812 | |
bc9a523d FCE |
10813 | // s.op->newline() << "if (rc)"; |
10814 | // s.op->newline(1) << "tracepoint_synchronize_unregister();"; | |
10815 | // s.op->indent(-1); | |
79189b84 | 10816 | } |
47dd066d WC |
10817 | |
10818 | ||
79189b84 JS |
10819 | void |
10820 | tracepoint_derived_probe_group::emit_module_exit (systemtap_session& s) | |
47dd066d | 10821 | { |
79189b84 JS |
10822 | if (probes.empty()) |
10823 | return; | |
47dd066d | 10824 | |
96b030fe JS |
10825 | s.op->newline() << "/* deregister tracepoint probes */"; |
10826 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++)"; | |
10827 | s.op->newline(1) << "stap_tracepoint_probes[i].unreg();"; | |
10828 | s.op->indent(-1); | |
47dd066d | 10829 | |
bc9a523d | 10830 | // Not necessary: see above. |
47dd066d | 10831 | |
bc9a523d | 10832 | // s.op->newline() << "tracepoint_synchronize_unregister();"; |
79189b84 | 10833 | } |
b20febf3 | 10834 | |
47dd066d | 10835 | |
75ead1f7 | 10836 | struct tracepoint_query : public base_query |
47dd066d | 10837 | { |
75ead1f7 JS |
10838 | tracepoint_query(dwflpp & dw, const string & tracepoint, |
10839 | probe * base_probe, probe_point * base_loc, | |
10840 | vector<derived_probe *> & results): | |
10841 | base_query(dw, "*"), tracepoint(tracepoint), | |
10842 | base_probe(base_probe), base_loc(base_loc), | |
10843 | results(results) {} | |
47dd066d | 10844 | |
75ead1f7 | 10845 | const string& tracepoint; |
47dd066d | 10846 | |
75ead1f7 JS |
10847 | probe * base_probe; |
10848 | probe_point * base_loc; | |
10849 | vector<derived_probe *> & results; | |
f982c59b | 10850 | set<string> probed_names; |
47dd066d | 10851 | |
75ead1f7 JS |
10852 | void handle_query_module(); |
10853 | int handle_query_cu(Dwarf_Die * cudie); | |
10854 | int handle_query_func(Dwarf_Die * func); | |
822a6a3d | 10855 | void query_library (const char *) {} |
576eaefe | 10856 | void query_plt (const char *entry, size_t addr) {} |
b20febf3 | 10857 | |
5c378838 | 10858 | static int tracepoint_query_cu (Dwarf_Die * cudie, tracepoint_query * q); |
7d007451 | 10859 | static int tracepoint_query_func (Dwarf_Die * func, tracepoint_query * q); |
75ead1f7 | 10860 | }; |
47dd066d WC |
10861 | |
10862 | ||
10863 | void | |
75ead1f7 | 10864 | tracepoint_query::handle_query_module() |
47dd066d | 10865 | { |
75ead1f7 | 10866 | // look for the tracepoints in each CU |
337b7c44 | 10867 | dw.iterate_over_cus(tracepoint_query_cu, this, false); |
47dd066d WC |
10868 | } |
10869 | ||
10870 | ||
75ead1f7 JS |
10871 | int |
10872 | tracepoint_query::handle_query_cu(Dwarf_Die * cudie) | |
47dd066d | 10873 | { |
75ead1f7 | 10874 | dw.focus_on_cu (cudie); |
5f52fafe | 10875 | dw.mod_info->get_symtab(); |
47dd066d | 10876 | |
75ead1f7 JS |
10877 | // look at each function to see if it's a tracepoint |
10878 | string function = "stapprobe_" + tracepoint; | |
10879 | return dw.iterate_over_functions (tracepoint_query_func, this, function); | |
47dd066d WC |
10880 | } |
10881 | ||
10882 | ||
75ead1f7 JS |
10883 | int |
10884 | tracepoint_query::handle_query_func(Dwarf_Die * func) | |
47dd066d | 10885 | { |
75ead1f7 | 10886 | dw.focus_on_function (func); |
47dd066d | 10887 | |
60d98537 | 10888 | assert(startswith(dw.function_name, "stapprobe_")); |
75ead1f7 | 10889 | string tracepoint_instance = dw.function_name.substr(10); |
f982c59b JS |
10890 | |
10891 | // check for duplicates -- sometimes tracepoint headers may be indirectly | |
10892 | // included in more than one of our tracequery modules. | |
10893 | if (!probed_names.insert(tracepoint_instance).second) | |
10894 | return DWARF_CB_OK; | |
10895 | ||
79189b84 JS |
10896 | derived_probe *dp = new tracepoint_derived_probe (dw.sess, dw, *func, |
10897 | tracepoint_instance, | |
10898 | base_probe, base_loc); | |
10899 | results.push_back (dp); | |
75ead1f7 | 10900 | return DWARF_CB_OK; |
47dd066d WC |
10901 | } |
10902 | ||
10903 | ||
75ead1f7 | 10904 | int |
5c378838 | 10905 | tracepoint_query::tracepoint_query_cu (Dwarf_Die * cudie, tracepoint_query * q) |
47dd066d | 10906 | { |
85007c04 | 10907 | if (pending_interrupts) return DWARF_CB_ABORT; |
75ead1f7 | 10908 | return q->handle_query_cu(cudie); |
47dd066d WC |
10909 | } |
10910 | ||
10911 | ||
75ead1f7 | 10912 | int |
7d007451 | 10913 | tracepoint_query::tracepoint_query_func (Dwarf_Die * func, tracepoint_query * q) |
47dd066d | 10914 | { |
85007c04 | 10915 | if (pending_interrupts) return DWARF_CB_ABORT; |
75ead1f7 | 10916 | return q->handle_query_func(func); |
47dd066d WC |
10917 | } |
10918 | ||
10919 | ||
0a6f5a3f | 10920 | struct tracepoint_builder: public derived_probe_builder |
47dd066d | 10921 | { |
0a6f5a3f JS |
10922 | private: |
10923 | dwflpp *dw; | |
10924 | bool init_dw(systemtap_session& s); | |
c9ccb642 FCE |
10925 | void get_tracequery_modules(systemtap_session& s, |
10926 | const vector<string>& headers, | |
10927 | vector<string>& modules); | |
47dd066d | 10928 | |
0a6f5a3f | 10929 | public: |
47dd066d | 10930 | |
0a6f5a3f JS |
10931 | tracepoint_builder(): dw(0) {} |
10932 | ~tracepoint_builder() { delete dw; } | |
47dd066d | 10933 | |
0a6f5a3f JS |
10934 | void build_no_more (systemtap_session& s) |
10935 | { | |
10936 | if (dw && s.verbose > 3) | |
b530b5b3 | 10937 | clog << _("tracepoint_builder releasing dwflpp") << endl; |
0a6f5a3f JS |
10938 | delete dw; |
10939 | dw = NULL; | |
435f53a7 FCE |
10940 | |
10941 | delete_session_module_cache (s); | |
0a6f5a3f | 10942 | } |
47dd066d | 10943 | |
0a6f5a3f JS |
10944 | void build(systemtap_session& s, |
10945 | probe *base, probe_point *location, | |
10946 | literal_map_t const& parameters, | |
10947 | vector<derived_probe*>& finished_results); | |
10948 | }; | |
47dd066d | 10949 | |
47dd066d | 10950 | |
c9ccb642 | 10951 | |
2a0e62a8 | 10952 | // Create (or cache) one or more tracequery .o modules, based upon the |
c9ccb642 FCE |
10953 | // tracepoint-related header files given. Return the generated or cached |
10954 | // modules[]. | |
10955 | ||
10956 | void | |
10957 | tracepoint_builder::get_tracequery_modules(systemtap_session& s, | |
10958 | const vector<string>& headers, | |
10959 | vector<string>& modules) | |
0a6f5a3f | 10960 | { |
c95eddf7 | 10961 | if (s.verbose > 2) |
55e50c24 | 10962 | { |
ce0f6648 | 10963 | clog << _F("Pass 2: getting a tracepoint query for %zu headers: ", headers.size()) << endl; |
55e50c24 JS |
10964 | for (size_t i = 0; i < headers.size(); ++i) |
10965 | clog << " " << headers[i] << endl; | |
10966 | } | |
c95eddf7 | 10967 | |
2a0e62a8 JS |
10968 | map<string,string> headers_cache_obj; // header name -> cache/.../tracequery_hash.o file name |
10969 | // Map the headers to cache .o names. Note that this has side-effects of | |
c9ccb642 FCE |
10970 | // creating the $SYSTEMTAP_DIR/.cache/XX/... directory and the hash-log file, |
10971 | // so we prefer not to repeat this. | |
10972 | vector<string> uncached_headers; | |
10973 | for (size_t i=0; i<headers.size(); i++) | |
2a0e62a8 | 10974 | headers_cache_obj[headers[i]] = find_tracequery_hash(s, headers[i]); |
c9ccb642 FCE |
10975 | |
10976 | // They may be in the cache already. | |
10977 | if (s.use_cache && !s.poison_cache) | |
10978 | for (size_t i=0; i<headers.size(); i++) | |
10979 | { | |
10980 | // see if the cached module exists | |
2a0e62a8 | 10981 | const string& tracequery_path = headers_cache_obj[headers[i]]; |
c9ccb642 FCE |
10982 | if (!tracequery_path.empty() && file_exists(tracequery_path)) |
10983 | { | |
10984 | if (s.verbose > 2) | |
10985 | clog << _F("Pass 2: using cached %s", tracequery_path.c_str()) << endl; | |
47dd066d | 10986 | |
c252fca2 JS |
10987 | // an empty file is a cached failure |
10988 | if (get_file_size(tracequery_path) > 0) | |
10989 | modules.push_back (tracequery_path); | |
c9ccb642 FCE |
10990 | } |
10991 | else | |
10992 | uncached_headers.push_back(headers[i]); | |
10993 | } | |
10994 | else | |
10995 | uncached_headers = headers; | |
f982c59b | 10996 | |
c9ccb642 FCE |
10997 | // If we have nothing left to search for, quit |
10998 | if (uncached_headers.empty()) return; | |
55e50c24 | 10999 | |
c9ccb642 | 11000 | map<string,string> headers_tracequery_src; // header -> C-source code mapping |
55e50c24 | 11001 | |
c9ccb642 FCE |
11002 | // We could query several subsets of headers[] to make this go |
11003 | // faster, but let's KISS and do one at a time. | |
11004 | for (size_t i=0; i<uncached_headers.size(); i++) | |
55e50c24 | 11005 | { |
c9ccb642 FCE |
11006 | const string& header = uncached_headers[i]; |
11007 | ||
11008 | // create a tracequery source file | |
11009 | ostringstream osrc; | |
11010 | ||
11011 | // PR9993: Add extra headers to work around undeclared types in individual | |
11012 | // include/trace/foo.h files | |
11013 | vector<string> short_decls = tracepoint_extra_decls(s, header); | |
11014 | ||
11015 | // add each requested tracepoint header | |
75ae2ec9 | 11016 | size_t root_pos = header.rfind("include/"); |
832f100d | 11017 | short_decls.push_back(string("#include <") + |
75ae2ec9 | 11018 | ((root_pos != string::npos) ? header.substr(root_pos + 8) : header) + |
d4393459 | 11019 | string(">")); |
f982c59b | 11020 | |
c9ccb642 FCE |
11021 | osrc << "#ifdef CONFIG_TRACEPOINTS" << endl; |
11022 | osrc << "#include <linux/tracepoint.h>" << endl; | |
832f100d JS |
11023 | |
11024 | // the kernel has changed this naming a few times, previously TPPROTO, | |
11025 | // TP_PROTO, TPARGS, TP_ARGS, etc. so let's just dupe the latest. | |
11026 | osrc << "#ifndef PARAMS" << endl; | |
11027 | osrc << "#define PARAMS(args...) args" << endl; | |
11028 | osrc << "#endif" << endl; | |
11029 | ||
c9ccb642 FCE |
11030 | // override DECLARE_TRACE to synthesize probe functions for us |
11031 | osrc << "#undef DECLARE_TRACE" << endl; | |
11032 | osrc << "#define DECLARE_TRACE(name, proto, args) \\" << endl; | |
11033 | osrc << " void stapprobe_##name(proto) {}" << endl; | |
832f100d | 11034 | |
c9ccb642 FCE |
11035 | // 2.6.35 added the NOARGS variant, but it's the same for us |
11036 | osrc << "#undef DECLARE_TRACE_NOARGS" << endl; | |
11037 | osrc << "#define DECLARE_TRACE_NOARGS(name) \\" << endl; | |
11038 | osrc << " DECLARE_TRACE(name, void, )" << endl; | |
832f100d JS |
11039 | |
11040 | // 2.6.38 added the CONDITION variant, which can also just redirect | |
11041 | osrc << "#undef DECLARE_TRACE_CONDITION" << endl; | |
11042 | osrc << "#define DECLARE_TRACE_CONDITION(name, proto, args, cond) \\" << endl; | |
11043 | osrc << " DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))" << endl; | |
11044 | ||
c9ccb642 FCE |
11045 | // older tracepoints used DEFINE_TRACE, so redirect that too |
11046 | osrc << "#undef DEFINE_TRACE" << endl; | |
11047 | osrc << "#define DEFINE_TRACE(name, proto, args) \\" << endl; | |
832f100d JS |
11048 | osrc << " DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))" << endl; |
11049 | ||
c9ccb642 FCE |
11050 | // add the specified decls/#includes |
11051 | for (unsigned z=0; z<short_decls.size(); z++) | |
11052 | osrc << "#undef TRACE_INCLUDE_FILE\n" | |
11053 | << "#undef TRACE_INCLUDE_PATH\n" | |
11054 | << short_decls[z] << "\n"; | |
11055 | ||
11056 | // finish up the module source | |
11057 | osrc << "#endif /* CONFIG_TRACEPOINTS */" << endl; | |
47dd066d | 11058 | |
c9ccb642 FCE |
11059 | // save the source file away |
11060 | headers_tracequery_src[header] = osrc.str(); | |
55e50c24 | 11061 | } |
f982c59b | 11062 | |
c9ccb642 | 11063 | // now build them all together |
2a0e62a8 | 11064 | map<string,string> tracequery_objs = make_tracequeries(s, headers_tracequery_src); |
47dd066d | 11065 | |
c9ccb642 | 11066 | // now plop them into the cache |
b278033a | 11067 | if (s.use_cache) |
c9ccb642 FCE |
11068 | for (size_t i=0; i<uncached_headers.size(); i++) |
11069 | { | |
11070 | const string& header = uncached_headers[i]; | |
2a0e62a8 JS |
11071 | const string& tracequery_obj = tracequery_objs[header]; |
11072 | const string& tracequery_path = headers_cache_obj[header]; | |
11073 | if (tracequery_obj !="" && file_exists(tracequery_obj)) | |
c9ccb642 | 11074 | { |
2a0e62a8 | 11075 | copy_file(tracequery_obj, tracequery_path, s.verbose > 2); |
c9ccb642 FCE |
11076 | modules.push_back (tracequery_path); |
11077 | } | |
c252fca2 JS |
11078 | else |
11079 | // cache an empty file for failures | |
11080 | copy_file("/dev/null", tracequery_path, s.verbose > 2); | |
c9ccb642 | 11081 | } |
f982c59b JS |
11082 | } |
11083 | ||
11084 | ||
d4393459 | 11085 | |
f982c59b JS |
11086 | bool |
11087 | tracepoint_builder::init_dw(systemtap_session& s) | |
11088 | { | |
11089 | if (dw != NULL) | |
11090 | return true; | |
11091 | ||
11092 | vector<string> tracequery_modules; | |
55e50c24 | 11093 | vector<string> system_headers; |
f982c59b JS |
11094 | |
11095 | glob_t trace_glob; | |
d4393459 FCE |
11096 | |
11097 | // find kernel_source_tree | |
11098 | if (s.kernel_source_tree == "") | |
f982c59b | 11099 | { |
d4393459 | 11100 | unsigned found; |
ccf2c922 | 11101 | Dwfl *dwfl = setup_dwfl_kernel ("kernel", &found, s); |
d4393459 FCE |
11102 | if (found) |
11103 | { | |
11104 | Dwarf_Die *cudie = 0; | |
11105 | Dwarf_Addr bias; | |
11106 | while ((cudie = dwfl_nextcu (dwfl, cudie, &bias)) != NULL) | |
11107 | { | |
e19ebcf7 | 11108 | assert_no_interrupts(); |
d4393459 FCE |
11109 | Dwarf_Attribute attr; |
11110 | const char* name = dwarf_formstring (dwarf_attr (cudie, DW_AT_comp_dir, &attr)); | |
36d65b45 | 11111 | if (name) |
d4393459 | 11112 | { |
36d65b45 JS |
11113 | // check that the path actually exists locally before we try to use it |
11114 | if (file_exists(name)) | |
11115 | { | |
11116 | if (s.verbose > 2) | |
11117 | clog << _F("Located kernel source tree (DW_AT_comp_dir) at '%s'", name) << endl; | |
11118 | s.kernel_source_tree = name; | |
11119 | } | |
11120 | else | |
11121 | { | |
11122 | if (s.verbose > 2) | |
11123 | clog << _F("Ignoring inaccessible kernel source tree (DW_AT_comp_dir) at '%s'", name) << endl; | |
11124 | } | |
61f1a63b | 11125 | |
d4393459 FCE |
11126 | break; // skip others; modern Kbuild uses same comp_dir for them all |
11127 | } | |
11128 | } | |
11129 | } | |
44392d73 | 11130 | dwfl_end (dwfl); |
d4393459 FCE |
11131 | } |
11132 | ||
11133 | // prefixes | |
11134 | vector<string> glob_prefixes; | |
11135 | glob_prefixes.push_back (s.kernel_build_tree); | |
11136 | if (s.kernel_source_tree != "") | |
11137 | glob_prefixes.push_back (s.kernel_source_tree); | |
11138 | ||
11139 | // suffixes | |
11140 | vector<string> glob_suffixes; | |
11141 | glob_suffixes.push_back("include/trace/events/*.h"); | |
11142 | glob_suffixes.push_back("include/trace/*.h"); | |
d97d428e | 11143 | glob_suffixes.push_back("include/ras/*_event.h"); |
d4393459 | 11144 | glob_suffixes.push_back("arch/x86/kvm/*trace.h"); |
d97d428e FCE |
11145 | glob_suffixes.push_back("arch/x86/kernel/*trace.h"); |
11146 | glob_suffixes.push_back("arch/*/include/asm/trace*.h"); | |
11147 | glob_suffixes.push_back("arch/*/include/asm/trace/*.h"); | |
f89ff3e2 | 11148 | glob_suffixes.push_back("fs/xfs/linux-*/xfs_tr*.h"); |
d97d428e FCE |
11149 | glob_suffixes.push_back("fs/*/*trace*.h"); |
11150 | glob_suffixes.push_back("net/*/*trace*.h"); | |
11151 | glob_suffixes.push_back("sound/pci/hda/*_trace.h"); | |
11152 | glob_suffixes.push_back("drivers/gpu/drm/*_trace.h"); | |
11153 | glob_suffixes.push_back("drivers/gpu/drm/*/*_trace.h"); | |
11154 | glob_suffixes.push_back("drivers/net/wireless/*/*/*trace*.h"); | |
11155 | glob_suffixes.push_back("drivers/usb/host/*trace*.h"); | |
11156 | ||
11157 | // see also tracepoint_extra_decls above | |
d4393459 FCE |
11158 | |
11159 | // compute cartesian product | |
11160 | vector<string> globs; | |
11161 | for (unsigned i=0; i<glob_prefixes.size(); i++) | |
11162 | for (unsigned j=0; j<glob_suffixes.size(); j++) | |
11163 | globs.push_back (glob_prefixes[i]+string("/")+glob_suffixes[j]); | |
11164 | ||
8aa43b8d | 11165 | set<string> duped_headers; |
d4393459 FCE |
11166 | for (unsigned z = 0; z < globs.size(); z++) |
11167 | { | |
11168 | string glob_str = globs[z]; | |
11169 | if (s.verbose > 3) | |
b530b5b3 | 11170 | clog << _("Checking tracepoint glob ") << glob_str << endl; |
d4393459 | 11171 | |
067cc66f CM |
11172 | int r = glob(glob_str.c_str(), 0, NULL, &trace_glob); |
11173 | if (r == GLOB_NOSPACE || r == GLOB_ABORTED) | |
11174 | throw runtime_error("Error globbing tracepoint"); | |
11175 | ||
f982c59b JS |
11176 | for (unsigned i = 0; i < trace_glob.gl_pathc; ++i) |
11177 | { | |
11178 | string header(trace_glob.gl_pathv[i]); | |
11179 | ||
11180 | // filter out a few known "internal-only" headers | |
60d98537 JS |
11181 | if (endswith(header, "/define_trace.h") || |
11182 | endswith(header, "/ftrace.h") || | |
11183 | endswith(header, "/trace_events.h") || | |
11184 | endswith(header, "_event_types.h")) | |
f982c59b JS |
11185 | continue; |
11186 | ||
b1966849 FCE |
11187 | // With headers now plopped under arch/FOO/include/asm/*, |
11188 | // the following logic miss some tracepoints. | |
11189 | #if 0 | |
8aa43b8d JS |
11190 | // skip identical headers from the build and source trees. |
11191 | size_t root_pos = header.rfind("include/"); | |
11192 | if (root_pos != string::npos && | |
11193 | !duped_headers.insert(header.substr(root_pos + 8)).second) | |
11194 | continue; | |
b1966849 | 11195 | #endif |
8aa43b8d | 11196 | |
55e50c24 | 11197 | system_headers.push_back(header); |
f982c59b JS |
11198 | } |
11199 | globfree(&trace_glob); | |
11200 | } | |
11201 | ||
c9ccb642 FCE |
11202 | // Build tracequery modules |
11203 | get_tracequery_modules(s, system_headers, tracequery_modules); | |
55e50c24 | 11204 | |
f982c59b JS |
11205 | // TODO: consider other sources of tracepoint headers too, like from |
11206 | // a command-line parameter or some environment or .systemtaprc | |
47dd066d | 11207 | |
59c11f91 | 11208 | dw = new dwflpp(s, tracequery_modules, true); |
0a6f5a3f JS |
11209 | return true; |
11210 | } | |
47dd066d | 11211 | |
0a6f5a3f JS |
11212 | void |
11213 | tracepoint_builder::build(systemtap_session& s, | |
11214 | probe *base, probe_point *location, | |
11215 | literal_map_t const& parameters, | |
11216 | vector<derived_probe*>& finished_results) | |
11217 | { | |
11218 | if (!init_dw(s)) | |
11219 | return; | |
47dd066d | 11220 | |
75ead1f7 JS |
11221 | string tracepoint; |
11222 | assert(get_param (parameters, TOK_TRACE, tracepoint)); | |
47dd066d | 11223 | |
75ead1f7 | 11224 | tracepoint_query q(*dw, tracepoint, base, location, finished_results); |
d906ab9d | 11225 | unsigned results_pre = finished_results.size(); |
06de3a04 | 11226 | dw->iterate_over_modules<base_query>(&query_module, &q); |
d906ab9d JL |
11227 | unsigned results_post = finished_results.size(); |
11228 | ||
11229 | // Did we fail to find a match? Let's suggest something! | |
11230 | if (results_pre == results_post) | |
11231 | { | |
11232 | size_t pos; | |
11233 | string sugs = suggest_dwarf_functions(s, q.visited_modules, tracepoint); | |
11234 | while ((pos = sugs.find("stapprobe_")) != string::npos) | |
11235 | sugs.erase(pos, string("stapprobe_").size()); | |
11236 | if (!sugs.empty()) | |
ece93f53 JL |
11237 | throw SEMANTIC_ERROR (_NF("no match (similar tracepoint: %s)", |
11238 | "no match (similar tracepoints: %s)", | |
d906ab9d JL |
11239 | sugs.find(',') == string::npos, |
11240 | sugs.c_str())); | |
11241 | } | |
47dd066d | 11242 | } |
47dd066d | 11243 | |
e6fe60e7 | 11244 | |
b55bc428 | 11245 | // ------------------------------------------------------------------------ |
bd2b1e68 | 11246 | // Standard tapset registry. |
b55bc428 FCE |
11247 | // ------------------------------------------------------------------------ |
11248 | ||
7a053d3b | 11249 | void |
f8220a7b | 11250 | register_standard_tapsets(systemtap_session & s) |
b55bc428 | 11251 | { |
47e0478e | 11252 | register_tapset_been(s); |
93646f4d | 11253 | register_tapset_itrace(s); |
dd0e4fa7 | 11254 | register_tapset_mark(s); |
7a212aa8 | 11255 | register_tapset_procfs(s); |
912e8c59 | 11256 | register_tapset_timers(s); |
8d9609f5 | 11257 | register_tapset_netfilter(s); |
b84779a5 | 11258 | register_tapset_utrace(s); |
b98a8d73 | 11259 | |
7a24d422 | 11260 | // dwarf-based kprobe/uprobe parts |
c4ce66a1 | 11261 | dwarf_derived_probe::register_patterns(s); |
30a279be | 11262 | |
888af770 FCE |
11263 | // XXX: user-space starter set |
11264 | s.pattern_root->bind_num(TOK_PROCESS) | |
11265 | ->bind_num(TOK_STATEMENT)->bind(TOK_ABSOLUTE) | |
f66bb29a | 11266 | ->bind_privilege(pr_all) |
888af770 FCE |
11267 | ->bind(new uprobe_builder ()); |
11268 | s.pattern_root->bind_num(TOK_PROCESS) | |
11269 | ->bind_num(TOK_STATEMENT)->bind(TOK_ABSOLUTE)->bind(TOK_RETURN) | |
f66bb29a | 11270 | ->bind_privilege(pr_all) |
888af770 FCE |
11271 | ->bind(new uprobe_builder ()); |
11272 | ||
0a6f5a3f JS |
11273 | // kernel tracepoint probes |
11274 | s.pattern_root->bind(TOK_KERNEL)->bind_str(TOK_TRACE) | |
11275 | ->bind(new tracepoint_builder()); | |
11276 | ||
e6fe60e7 AM |
11277 | // Kprobe based probe |
11278 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION) | |
11279 | ->bind(new kprobe_builder()); | |
3c57fe1f JS |
11280 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION)->bind(TOK_CALL) |
11281 | ->bind(new kprobe_builder()); | |
e6fe60e7 AM |
11282 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) |
11283 | ->bind_str(TOK_FUNCTION)->bind(new kprobe_builder()); | |
3c57fe1f JS |
11284 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) |
11285 | ->bind_str(TOK_FUNCTION)->bind(TOK_CALL)->bind(new kprobe_builder()); | |
e6fe60e7 AM |
11286 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION)->bind(TOK_RETURN) |
11287 | ->bind(new kprobe_builder()); | |
b6371390 JS |
11288 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION)->bind(TOK_RETURN) |
11289 | ->bind_num(TOK_MAXACTIVE)->bind(new kprobe_builder()); | |
e6fe60e7 AM |
11290 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) |
11291 | ->bind_str(TOK_FUNCTION)->bind(TOK_RETURN)->bind(new kprobe_builder()); | |
b6371390 JS |
11292 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) |
11293 | ->bind_str(TOK_FUNCTION)->bind(TOK_RETURN) | |
11294 | ->bind_num(TOK_MAXACTIVE)->bind(new kprobe_builder()); | |
e6fe60e7 AM |
11295 | s.pattern_root->bind(TOK_KPROBE)->bind_num(TOK_STATEMENT) |
11296 | ->bind(TOK_ABSOLUTE)->bind(new kprobe_builder()); | |
dd225250 PS |
11297 | |
11298 | //Hwbkpt based probe | |
b47f3a55 FCE |
11299 | // NB: we formerly registered the probe point types only if the kernel configuration |
11300 | // allowed it. However, we get better error messages if we allow probes to resolve. | |
11301 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
11302 | ->bind(TOK_HWBKPT_WRITE)->bind(new hwbkpt_builder()); | |
11303 | s.pattern_root->bind(TOK_KERNEL)->bind_str(TOK_HWBKPT) | |
11304 | ->bind(TOK_HWBKPT_WRITE)->bind(new hwbkpt_builder()); | |
11305 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
11306 | ->bind(TOK_HWBKPT_RW)->bind(new hwbkpt_builder()); | |
11307 | s.pattern_root->bind(TOK_KERNEL)->bind_str(TOK_HWBKPT) | |
11308 | ->bind(TOK_HWBKPT_RW)->bind(new hwbkpt_builder()); | |
11309 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
11310 | ->bind_num(TOK_LENGTH)->bind(TOK_HWBKPT_WRITE)->bind(new hwbkpt_builder()); | |
11311 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
11312 | ->bind_num(TOK_LENGTH)->bind(TOK_HWBKPT_RW)->bind(new hwbkpt_builder()); | |
11313 | // length supported with address only, not symbol names | |
83ea76b1 WC |
11314 | |
11315 | //perf event based probe | |
4763f713 | 11316 | register_tapset_perf(s); |
a29858ef | 11317 | register_tapset_java(s); |
b55bc428 | 11318 | } |
dc38c0ae DS |
11319 | |
11320 | ||
b20febf3 FCE |
11321 | vector<derived_probe_group*> |
11322 | all_session_groups(systemtap_session& s) | |
dc38c0ae | 11323 | { |
b20febf3 | 11324 | vector<derived_probe_group*> g; |
912e8c59 JS |
11325 | |
11326 | #define DOONE(x) \ | |
11327 | if (s. x##_derived_probes) \ | |
11328 | g.push_back ((derived_probe_group*)(s. x##_derived_probes)) | |
ab655cf8 DS |
11329 | |
11330 | // Note that order *is* important here. We want to make sure we | |
11331 | // register (actually run) begin probes before any other probe type | |
11332 | // is run. Similarly, when unregistering probes, we want to | |
11333 | // unregister (actually run) end probes after every other probe type | |
11334 | // has be unregistered. To do the latter, | |
11335 | // c_unparser::emit_module_exit() will run this list backwards. | |
b20febf3 FCE |
11336 | DOONE(be); |
11337 | DOONE(dwarf); | |
888af770 | 11338 | DOONE(uprobe); |
b20febf3 FCE |
11339 | DOONE(timer); |
11340 | DOONE(profile); | |
11341 | DOONE(mark); | |
0a6f5a3f | 11342 | DOONE(tracepoint); |
e6fe60e7 | 11343 | DOONE(kprobe); |
dd225250 | 11344 | DOONE(hwbkpt); |
83ea76b1 | 11345 | DOONE(perf); |
b20febf3 | 11346 | DOONE(hrtimer); |
ce82316f | 11347 | DOONE(procfs); |
8d9609f5 | 11348 | DOONE(netfilter); |
935447c8 DS |
11349 | |
11350 | // Another "order is important" item. We want to make sure we | |
11351 | // "register" the dummy task_finder probe group after all probe | |
11352 | // groups that use the task_finder. | |
11353 | DOONE(utrace); | |
a96d1db0 | 11354 | DOONE(itrace); |
f31a77f5 | 11355 | DOONE(dynprobe); |
e7d4410d | 11356 | DOONE(java); |
935447c8 | 11357 | DOONE(task_finder); |
b20febf3 FCE |
11358 | #undef DOONE |
11359 | return g; | |
46b84a80 | 11360 | } |
73267b89 JS |
11361 | |
11362 | /* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */ |