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Commit | Line | Data |
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56e12059 | 1 | // tapset resolution |
e3bbc038 | 2 | // Copyright (C) 2005-2012 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" |
56e12059 | 16 | #include "translate.h" |
dc38c0ae | 17 | #include "session.h" |
72dbc915 | 18 | #include "util.h" |
0a6f5a3f | 19 | #include "buildrun.h" |
86bf665e | 20 | #include "dwarf_wrappers.h" |
2e67a43b | 21 | #include "auto_free.h" |
b278033a | 22 | #include "hash.h" |
440f755a | 23 | #include "dwflpp.h" |
5f8ca04f | 24 | #include "setupdwfl.h" |
6b51ee12 | 25 | #include <gelf.h> |
22d737e8 | 26 | |
4d0d9e8a | 27 | #include "sdt_types.h" |
bd2b1e68 | 28 | |
3b579393 FCE |
29 | #include <cstdlib> |
30 | #include <algorithm> | |
bd2b1e68 | 31 | #include <deque> |
56e12059 | 32 | #include <iostream> |
d1bcbe71 | 33 | #include <fstream> |
bd2b1e68 | 34 | #include <map> |
ec4373ff | 35 | #include <set> |
56e12059 | 36 | #include <sstream> |
bd2b1e68 | 37 | #include <stdexcept> |
b55bc428 | 38 | #include <vector> |
e36387d7 | 39 | #include <cstdarg> |
29e64872 | 40 | #include <cassert> |
1969b5bc | 41 | #include <iomanip> |
f781f849 | 42 | #include <cerrno> |
bd2b1e68 GH |
43 | |
44 | extern "C" { | |
df8fadee | 45 | #include <fcntl.h> |
bd2b1e68 | 46 | #include <elfutils/libdwfl.h> |
7a053d3b | 47 | #include <elfutils/libdw.h> |
77de5e9e GH |
48 | #include <dwarf.h> |
49 | #include <elf.h> | |
50 | #include <obstack.h> | |
b20febf3 | 51 | #include <glob.h> |
30a279be | 52 | #include <fnmatch.h> |
5f0a03a6 | 53 | #include <stdio.h> |
349dc70e | 54 | #include <sys/types.h> |
37001baa | 55 | #include <sys/stat.h> |
aaf7ffe8 | 56 | #include <math.h> |
aff5d390 | 57 | #include <regex.h> |
37001baa | 58 | #include <unistd.h> |
6d5d594e | 59 | #include <wordexp.h> |
4b1ad75e RM |
60 | |
61 | #define __STDC_FORMAT_MACROS | |
62 | #include <inttypes.h> | |
bd2b1e68 | 63 | } |
77de5e9e | 64 | |
56e12059 FCE |
65 | |
66 | using namespace std; | |
2171f774 | 67 | using namespace __gnu_cxx; |
56e12059 | 68 | |
47dd066d | 69 | |
b20febf3 FCE |
70 | |
71 | // ------------------------------------------------------------------------ | |
faea5e16 JS |
72 | |
73 | string | |
74 | common_probe_init (derived_probe* p) | |
75 | { | |
26e63673 JS |
76 | assert(p->session_index != (unsigned)-1); |
77 | return "(&stap_probes[" + lex_cast(p->session_index) + "])"; | |
faea5e16 JS |
78 | } |
79 | ||
80 | ||
b20febf3 | 81 | void |
a58d79d0 | 82 | common_probe_entryfn_prologue (translator_output* o, string statestr, |
6eefe942 MW |
83 | string probe, string probe_type, |
84 | bool overload_processing) | |
b20febf3 | 85 | { |
653e6a9a JS |
86 | o->newline() << "#ifdef STP_ALIBI"; |
87 | o->newline() << "atomic_inc(&(" << probe << "->alibi));"; | |
88 | o->newline() << "#else"; | |
89 | ||
72d18b98 | 90 | o->newline() << "struct context* __restrict__ c;"; |
e0a17418 JS |
91 | o->newline() << "#if !INTERRUPTIBLE"; |
92 | o->newline() << "unsigned long flags;"; | |
93 | o->newline() << "#endif"; | |
b20febf3 | 94 | |
a58d79d0 DS |
95 | if (overload_processing) |
96 | o->newline() << "#if defined(STP_TIMING) || defined(STP_OVERLOAD)"; | |
97 | else | |
98 | o->newline() << "#ifdef STP_TIMING"; | |
99 | o->newline() << "cycles_t cycles_atstart = get_cycles ();"; | |
b20febf3 | 100 | o->newline() << "#endif"; |
b20febf3 | 101 | |
994aac0e | 102 | o->newline() << "#ifdef STP_TIMING"; |
26e63673 | 103 | o->newline() << "Stat stat = " << probe << "->timing;"; |
994aac0e JS |
104 | o->newline() << "#endif"; |
105 | ||
e0a17418 JS |
106 | o->newline() << "#if INTERRUPTIBLE"; |
107 | o->newline() << "preempt_disable ();"; | |
108 | o->newline() << "#else"; | |
109 | o->newline() << "local_irq_save (flags);"; | |
110 | o->newline() << "#endif"; | |
b20febf3 | 111 | |
c931ec8a | 112 | // Check for enough free enough stack space |
d05a1d00 | 113 | o->newline() << "if (unlikely ((((unsigned long) (& c)) & (THREAD_SIZE-1))"; // free space |
a63401b1 | 114 | o->newline(1) << "< (MINSTACKSPACE + sizeof (struct thread_info)))) {"; // needed space |
d05a1d00 FCE |
115 | // XXX: may need porting to platforms where task_struct is not at bottom of kernel stack |
116 | // NB: see also CONFIG_DEBUG_STACKOVERFLOW | |
b3c3ca7c FCE |
117 | o->newline() << "atomic_inc (& skipped_count);"; |
118 | o->newline() << "#ifdef STP_TIMING"; | |
119 | o->newline() << "atomic_inc (& skipped_count_lowstack);"; | |
120 | o->newline() << "#endif"; | |
c931ec8a FCE |
121 | o->newline() << "goto probe_epilogue;"; |
122 | o->newline(-1) << "}"; | |
123 | ||
b20febf3 FCE |
124 | o->newline() << "if (atomic_read (&session_state) != " << statestr << ")"; |
125 | o->newline(1) << "goto probe_epilogue;"; | |
126 | o->indent(-1); | |
9a604fac | 127 | |
4a0ae64c | 128 | o->newline() << "c = contexts[smp_processor_id()];"; |
b3c3ca7c | 129 | o->newline() << "if (atomic_inc_return (& c->busy) != 1) {"; |
9c736061 FCE |
130 | o->newline(1) << "#if !INTERRUPTIBLE"; |
131 | o->newline() << "atomic_inc (& skipped_count);"; | |
132 | o->newline() << "#endif"; | |
b3c3ca7c FCE |
133 | o->newline() << "#ifdef STP_TIMING"; |
134 | o->newline() << "atomic_inc (& skipped_count_reentrant);"; | |
c12d974f FCE |
135 | o->newline() << "#ifdef DEBUG_REENTRANCY"; |
136 | o->newline() << "_stp_warn (\"Skipped %s due to %s residency on cpu %u\\n\", " | |
26e63673 | 137 | << probe << "->pp, c->probe_point ?: \"?\", smp_processor_id());"; |
c12d974f FCE |
138 | // NB: There is a conceivable race condition here with reading |
139 | // c->probe_point, knowing that this other probe is sort of running. | |
140 | // However, in reality, it's interrupted. Plus even if it were able | |
141 | // to somehow start again, and stop before we read c->probe_point, | |
142 | // at least we have that ?: "?" bit in there to avoid a NULL deref. | |
143 | o->newline() << "#endif"; | |
b3c3ca7c | 144 | o->newline() << "#endif"; |
9a604fac | 145 | o->newline() << "atomic_dec (& c->busy);"; |
b20febf3 | 146 | o->newline() << "goto probe_epilogue;"; |
9a604fac FCE |
147 | o->newline(-1) << "}"; |
148 | o->newline(); | |
1e00cfb1 | 149 | o->newline() << "c->last_stmt = 0;"; |
9a604fac | 150 | o->newline() << "c->last_error = 0;"; |
a7ed0d3e | 151 | o->newline() << "c->nesting = -1;"; // NB: PR10516 packs locals[] tighter |
d9aed31e MW |
152 | o->newline() << "c->uregs = 0;"; |
153 | o->newline() << "c->kregs = 0;"; | |
d4670309 | 154 | o->newline() << "#if defined __ia64__"; |
b916df9c | 155 | o->newline() << "c->unwaddr = 0;"; |
d4670309 | 156 | o->newline() << "#endif"; |
26e63673 | 157 | o->newline() << "c->probe_point = " << probe << "->pp;"; |
d48df0cf | 158 | o->newline() << "#ifdef STP_NEED_PROBE_NAME"; |
26e63673 | 159 | o->newline() << "c->probe_name = " << probe << "->pn;"; |
2d767770 | 160 | o->newline() << "#endif"; |
6eefe942 | 161 | o->newline() << "c->probe_type = " << probe_type << ";"; |
6dceb5c9 MW |
162 | // reset Individual Probe State union |
163 | o->newline() << "memset(&c->ips, 0, sizeof(c->ips));"; | |
92c25572 | 164 | o->newline() << "c->probe_flags = 0;"; |
309d67d8 | 165 | o->newline() << "#ifdef STAP_NEED_REGPARM"; // i386 or x86_64 register.stp |
9addf322 | 166 | o->newline() << "c->regparm = 0;"; |
309d67d8 | 167 | o->newline() << "#endif"; |
e0a17418 JS |
168 | |
169 | o->newline() << "#if INTERRUPTIBLE"; | |
170 | o->newline() << "c->actionremaining = MAXACTION_INTERRUPTIBLE;"; | |
171 | o->newline() << "#else"; | |
172 | o->newline() << "c->actionremaining = MAXACTION;"; | |
173 | o->newline() << "#endif"; | |
9915575b FCE |
174 | // NB: The following would actually be incorrect. |
175 | // That's because cycles_sum/cycles_base values are supposed to survive | |
176 | // between consecutive probes. Periodically (STP_OVERLOAD_INTERVAL | |
177 | // cycles), the values will be reset. | |
178 | /* | |
f0e6dc63 FCE |
179 | o->newline() << "#ifdef STP_OVERLOAD"; |
180 | o->newline() << "c->cycles_sum = 0;"; | |
181 | o->newline() << "c->cycles_base = 0;"; | |
41c262f3 | 182 | o->newline() << "#endif"; |
9915575b | 183 | */ |
b20febf3 | 184 | } |
9a604fac | 185 | |
a44a0785 | 186 | |
b20febf3 | 187 | void |
a58d79d0 | 188 | common_probe_entryfn_epilogue (translator_output* o, |
7baf48e9 FCE |
189 | bool overload_processing, |
190 | bool suppress_handler_errors) | |
b20febf3 | 191 | { |
a58d79d0 DS |
192 | if (overload_processing) |
193 | o->newline() << "#if defined(STP_TIMING) || defined(STP_OVERLOAD)"; | |
194 | else | |
195 | o->newline() << "#ifdef STP_TIMING"; | |
dbb68664 | 196 | o->newline() << "{"; |
a58d79d0 DS |
197 | o->newline(1) << "cycles_t cycles_atend = get_cycles ();"; |
198 | // NB: we truncate cycles counts to 32 bits. Perhaps it should be | |
199 | // fewer, if the hardware counter rolls over really quickly. We | |
200 | // handle 32-bit wraparound here. | |
201 | o->newline() << "int32_t cycles_elapsed = ((int32_t)cycles_atend > (int32_t)cycles_atstart)"; | |
202 | o->newline(1) << "? ((int32_t)cycles_atend - (int32_t)cycles_atstart)"; | |
203 | o->newline() << ": (~(int32_t)0) - (int32_t)cycles_atstart + (int32_t)cycles_atend + 1;"; | |
204 | o->indent(-1); | |
dbb68664 | 205 | |
a58d79d0 | 206 | o->newline() << "#ifdef STP_TIMING"; |
994aac0e | 207 | o->newline() << "if (likely (stat)) _stp_stat_add(stat, cycles_elapsed);"; |
a58d79d0 DS |
208 | o->newline() << "#endif"; |
209 | ||
210 | if (overload_processing) | |
211 | { | |
212 | o->newline() << "#ifdef STP_OVERLOAD"; | |
213 | o->newline() << "{"; | |
214 | // If the cycle count has wrapped (cycles_atend > cycles_base), | |
215 | // let's go ahead and pretend the interval has been reached. | |
216 | // This should reset cycles_base and cycles_sum. | |
217 | o->newline(1) << "cycles_t interval = (cycles_atend > c->cycles_base)"; | |
218 | o->newline(1) << "? (cycles_atend - c->cycles_base)"; | |
219 | o->newline() << ": (STP_OVERLOAD_INTERVAL + 1);"; | |
220 | o->newline(-1) << "c->cycles_sum += cycles_elapsed;"; | |
221 | ||
222 | // If we've spent more than STP_OVERLOAD_THRESHOLD cycles in a | |
223 | // probe during the last STP_OVERLOAD_INTERVAL cycles, the probe | |
224 | // has overloaded the system and we need to quit. | |
7baf48e9 FCE |
225 | // NB: this is not suppressible via --suppress-runtime-errors, |
226 | // because this is a system safety metric that we cannot trust | |
227 | // unprivileged users to override. | |
a58d79d0 DS |
228 | o->newline() << "if (interval > STP_OVERLOAD_INTERVAL) {"; |
229 | o->newline(1) << "if (c->cycles_sum > STP_OVERLOAD_THRESHOLD) {"; | |
230 | o->newline(1) << "_stp_error (\"probe overhead exceeded threshold\");"; | |
231 | o->newline() << "atomic_set (&session_state, STAP_SESSION_ERROR);"; | |
551e9f14 | 232 | o->newline() << "atomic_inc (&error_count);"; |
a58d79d0 | 233 | o->newline(-1) << "}"; |
e57b735a | 234 | |
a58d79d0 DS |
235 | o->newline() << "c->cycles_base = cycles_atend;"; |
236 | o->newline() << "c->cycles_sum = 0;"; | |
237 | o->newline(-1) << "}"; | |
238 | o->newline(-1) << "}"; | |
239 | o->newline() << "#endif"; | |
240 | } | |
e57b735a | 241 | |
440f755a JS |
242 | o->newline(-1) << "}"; |
243 | o->newline() << "#endif"; | |
e57b735a | 244 | |
440f755a | 245 | o->newline() << "c->probe_point = 0;"; // vacated |
dc575eac | 246 | o->newline() << "#ifdef STP_NEED_PROBE_NAME"; |
d48df0cf | 247 | o->newline() << "c->probe_name = 0;"; |
dc575eac | 248 | o->newline() << "#endif"; |
6eefe942 | 249 | o->newline() << "c->probe_type = 0;"; |
7baf48e9 FCE |
250 | |
251 | ||
440f755a | 252 | o->newline() << "if (unlikely (c->last_error && c->last_error[0])) {"; |
7baf48e9 FCE |
253 | o->indent(1); |
254 | if (suppress_handler_errors) // PR 13306 | |
255 | { | |
256 | o->newline() << "atomic_inc (& error_count);"; | |
257 | } | |
258 | else | |
259 | { | |
260 | o->newline() << "if (c->last_stmt != NULL)"; | |
261 | o->newline(1) << "_stp_softerror (\"%s near %s\", c->last_error, c->last_stmt);"; | |
262 | o->newline(-1) << "else"; | |
263 | o->newline(1) << "_stp_softerror (\"%s\", c->last_error);"; | |
264 | o->indent(-1); | |
265 | o->newline() << "atomic_inc (& error_count);"; | |
266 | o->newline() << "if (atomic_read (& error_count) > MAXERRORS) {"; | |
267 | o->newline(1) << "atomic_set (& session_state, STAP_SESSION_ERROR);"; | |
268 | o->newline() << "_stp_exit ();"; | |
269 | o->newline(-1) << "}"; | |
270 | } | |
271 | ||
440f755a | 272 | o->newline(-1) << "}"; |
7baf48e9 FCE |
273 | |
274 | ||
440f755a | 275 | o->newline() << "atomic_dec (&c->busy);"; |
e57b735a | 276 | |
440f755a JS |
277 | o->newline(-1) << "probe_epilogue:"; // context is free |
278 | o->indent(1); | |
e57b735a | 279 | |
7baf48e9 FCE |
280 | if (! suppress_handler_errors) // PR 13306 |
281 | { | |
282 | // Check for excessive skip counts. | |
283 | o->newline() << "if (unlikely (atomic_read (& skipped_count) > MAXSKIPPED)) {"; | |
284 | o->newline(1) << "if (unlikely (pseudo_atomic_cmpxchg(& session_state, STAP_SESSION_RUNNING, STAP_SESSION_ERROR) == STAP_SESSION_RUNNING))"; | |
285 | o->newline() << "_stp_error (\"Skipped too many probes, check MAXSKIPPED or try again with stap -t for more details.\");"; | |
286 | o->newline(-1) << "}"; | |
287 | } | |
e57b735a | 288 | |
440f755a JS |
289 | o->newline() << "#if INTERRUPTIBLE"; |
290 | o->newline() << "preempt_enable_no_resched ();"; | |
291 | o->newline() << "#else"; | |
292 | o->newline() << "local_irq_restore (flags);"; | |
293 | o->newline() << "#endif"; | |
653e6a9a JS |
294 | |
295 | o->newline() << "#endif // STP_ALIBI"; | |
440f755a | 296 | } |
e57b735a | 297 | |
e57b735a | 298 | |
440f755a | 299 | // ------------------------------------------------------------------------ |
e57b735a | 300 | |
440f755a JS |
301 | // ------------------------------------------------------------------------ |
302 | // Dwarf derived probes. "We apologize for the inconvience." | |
303 | // ------------------------------------------------------------------------ | |
e57b735a | 304 | |
4627ed58 JS |
305 | static const string TOK_KERNEL("kernel"); |
306 | static const string TOK_MODULE("module"); | |
307 | static const string TOK_FUNCTION("function"); | |
308 | static const string TOK_INLINE("inline"); | |
309 | static const string TOK_CALL("call"); | |
4bda987e | 310 | static const string TOK_EXPORTED("exported"); |
4627ed58 JS |
311 | static const string TOK_RETURN("return"); |
312 | static const string TOK_MAXACTIVE("maxactive"); | |
313 | static const string TOK_STATEMENT("statement"); | |
314 | static const string TOK_ABSOLUTE("absolute"); | |
315 | static const string TOK_PROCESS("process"); | |
a794dbeb | 316 | static const string TOK_PROVIDER("provider"); |
4627ed58 JS |
317 | static const string TOK_MARK("mark"); |
318 | static const string TOK_TRACE("trace"); | |
319 | static const string TOK_LABEL("label"); | |
63b4fd14 | 320 | static const string TOK_LIBRARY("library"); |
576eaefe | 321 | static const string TOK_PLT("plt"); |
e57b735a | 322 | |
1adf8ef1 | 323 | static int query_cu (Dwarf_Die * cudie, void * arg); |
6b517475 | 324 | static void query_addr(Dwarf_Addr addr, dwarf_query *q); |
e57b735a | 325 | |
440f755a JS |
326 | // Can we handle this query with just symbol-table info? |
327 | enum dbinfo_reqt | |
328 | { | |
329 | dbr_unknown, | |
330 | dbr_none, // kernel.statement(NUM).absolute | |
331 | dbr_need_symtab, // can get by with symbol table if there's no dwarf | |
332 | dbr_need_dwarf | |
333 | }; | |
e57b735a | 334 | |
20e4a32c | 335 | |
440f755a JS |
336 | struct base_query; // forward decls |
337 | struct dwarf_query; | |
338 | struct dwflpp; | |
339 | struct symbol_table; | |
20e4a32c | 340 | |
a781f401 | 341 | |
440f755a JS |
342 | struct |
343 | symbol_table | |
344 | { | |
345 | module_info *mod_info; // associated module | |
346 | map<string, func_info*> map_by_name; | |
1c6b77e5 JS |
347 | multimap<Dwarf_Addr, func_info*> map_by_addr; |
348 | typedef multimap<Dwarf_Addr, func_info*>::iterator iterator_t; | |
440f755a JS |
349 | typedef pair<iterator_t, iterator_t> range_t; |
350 | #ifdef __powerpc__ | |
351 | GElf_Word opd_section; | |
352 | #endif | |
2867a2a1 JS |
353 | void add_symbol(const char *name, bool weak, bool descriptor, |
354 | Dwarf_Addr addr, Dwarf_Addr *high_addr); | |
440f755a | 355 | enum info_status read_symbols(FILE *f, const string& path); |
83ca3872 | 356 | enum info_status read_from_elf_file(const string& path, |
2713ea24 | 357 | systemtap_session &sess); |
83ca3872 | 358 | enum info_status read_from_text_file(const string& path, |
2713ea24 | 359 | systemtap_session &sess); |
440f755a JS |
360 | enum info_status get_from_elf(); |
361 | void prepare_section_rejection(Dwfl_Module *mod); | |
362 | bool reject_section(GElf_Word section); | |
440f755a JS |
363 | void purge_syscall_stubs(); |
364 | func_info *lookup_symbol(const string& name); | |
365 | Dwarf_Addr lookup_symbol_address(const string& name); | |
366 | func_info *get_func_containing_address(Dwarf_Addr addr); | |
3d372d6b | 367 | func_info *get_first_func(); |
7a053d3b | 368 | |
440f755a JS |
369 | symbol_table(module_info *mi) : mod_info(mi) {} |
370 | ~symbol_table(); | |
371 | }; | |
77de5e9e | 372 | |
440f755a JS |
373 | static bool null_die(Dwarf_Die *die) |
374 | { | |
822a6a3d | 375 | static Dwarf_Die null; |
440f755a JS |
376 | return (!die || !memcmp(die, &null, sizeof(null))); |
377 | } | |
c4ce66a1 JS |
378 | |
379 | ||
7a053d3b | 380 | enum |
bd2b1e68 | 381 | function_spec_type |
7a053d3b | 382 | { |
bd2b1e68 GH |
383 | function_alone, |
384 | function_and_file, | |
7a053d3b | 385 | function_file_and_line |
bd2b1e68 GH |
386 | }; |
387 | ||
ec4373ff | 388 | |
bd2b1e68 | 389 | struct dwarf_builder; |
f10534c6 | 390 | struct dwarf_var_expanding_visitor; |
77de5e9e | 391 | |
2930abc7 | 392 | |
b20febf3 FCE |
393 | // XXX: This class is a candidate for subclassing to separate |
394 | // the relocation vs non-relocation variants. Likewise for | |
395 | // kprobe vs kretprobe variants. | |
396 | ||
397 | struct dwarf_derived_probe: public derived_probe | |
b55bc428 | 398 | { |
b20febf3 FCE |
399 | dwarf_derived_probe (const string& function, |
400 | const string& filename, | |
401 | int line, | |
402 | const string& module, | |
403 | const string& section, | |
404 | Dwarf_Addr dwfl_addr, | |
2930abc7 | 405 | Dwarf_Addr addr, |
b20febf3 FCE |
406 | dwarf_query & q, |
407 | Dwarf_Die* scope_die); | |
20e4a32c | 408 | |
b20febf3 FCE |
409 | string module; |
410 | string section; | |
411 | Dwarf_Addr addr; | |
63b4fd14 | 412 | string path; |
27dc09b1 | 413 | bool has_process; |
2930abc7 | 414 | bool has_return; |
c9bad430 | 415 | bool has_maxactive; |
63b4fd14 | 416 | bool has_library; |
c9bad430 | 417 | long maxactive_val; |
4ad95bbc | 418 | // dwarf_derived_probe_group::emit_module_decls uses this to emit sdt kprobe definition |
b642c901 SC |
419 | string user_path; |
420 | string user_lib; | |
b95e2b79 | 421 | bool access_vars; |
2930abc7 | 422 | |
af234c40 JS |
423 | unsigned saved_longs, saved_strings; |
424 | dwarf_derived_probe* entry_handler; | |
425 | ||
b8da0ad1 | 426 | void printsig (std::ostream &o) const; |
6b66b9f7 | 427 | virtual void join_group (systemtap_session& s); |
9020300d | 428 | void emit_probe_local_init(translator_output * o); |
d0bfd2ac | 429 | void getargs(std::list<std::string> &arg_set) const; |
0a98fd42 | 430 | |
42e38653 | 431 | void emit_privilege_assertion (translator_output*); |
27dc09b1 DB |
432 | void print_dupe_stamp(ostream& o); |
433 | ||
bd2b1e68 | 434 | // Pattern registration helpers. |
7a053d3b | 435 | static void register_statement_variants(match_node * root, |
27dc09b1 | 436 | dwarf_builder * dw, |
42e38653 | 437 | privilege_t privilege); |
fd6602a0 | 438 | static void register_function_variants(match_node * root, |
27dc09b1 | 439 | dwarf_builder * dw, |
42e38653 | 440 | privilege_t privilege); |
440d9b00 DB |
441 | static void register_function_and_statement_variants(systemtap_session& s, |
442 | match_node * root, | |
27dc09b1 | 443 | dwarf_builder * dw, |
42e38653 | 444 | privilege_t privilege); |
b1615c74 JS |
445 | static void register_sdt_variants(systemtap_session& s, |
446 | match_node * root, | |
447 | dwarf_builder * dw); | |
448 | static void register_plt_variants(systemtap_session& s, | |
449 | match_node * root, | |
450 | dwarf_builder * dw); | |
c4ce66a1 | 451 | static void register_patterns(systemtap_session& s); |
6b66b9f7 JS |
452 | |
453 | protected: | |
454 | dwarf_derived_probe(probe *base, | |
455 | probe_point *location, | |
456 | Dwarf_Addr addr, | |
457 | bool has_return): | |
74fe61bc LB |
458 | derived_probe(base, location), addr(addr), has_process(0), |
459 | has_return(has_return), has_maxactive(0), has_library(0), | |
460 | maxactive_val(0), access_vars(false), saved_longs(0), | |
461 | saved_strings(0), entry_handler(0) | |
6b66b9f7 JS |
462 | {} |
463 | ||
464 | private: | |
d0bfd2ac | 465 | list<string> args; |
8c67c337 | 466 | void saveargs(dwarf_query& q, Dwarf_Die* scope_die, Dwarf_Addr dwfl_addr); |
20c6c071 GH |
467 | }; |
468 | ||
dc38c0ae | 469 | |
6b66b9f7 | 470 | struct uprobe_derived_probe: public dwarf_derived_probe |
6d0f3f0c | 471 | { |
6d0f3f0c | 472 | int pid; // 0 => unrestricted |
0973d815 | 473 | |
6d0f3f0c FCE |
474 | uprobe_derived_probe (const string& function, |
475 | const string& filename, | |
476 | int line, | |
477 | const string& module, | |
6d0f3f0c FCE |
478 | const string& section, |
479 | Dwarf_Addr dwfl_addr, | |
480 | Dwarf_Addr addr, | |
481 | dwarf_query & q, | |
6b66b9f7 JS |
482 | Dwarf_Die* scope_die): |
483 | dwarf_derived_probe(function, filename, line, module, section, | |
484 | dwfl_addr, addr, q, scope_die), pid(0) | |
485 | {} | |
6d0f3f0c | 486 | |
0973d815 FCE |
487 | // alternate constructor for process(PID).statement(ADDR).absolute |
488 | uprobe_derived_probe (probe *base, | |
489 | probe_point *location, | |
490 | int pid, | |
491 | Dwarf_Addr addr, | |
6b66b9f7 JS |
492 | bool has_return): |
493 | dwarf_derived_probe(base, location, addr, has_return), pid(pid) | |
494 | {} | |
9ace370f | 495 | |
6d0f3f0c | 496 | void join_group (systemtap_session& s); |
2865d17a | 497 | |
42e38653 | 498 | void emit_privilege_assertion (translator_output*); |
8f6d8c2b | 499 | void print_dupe_stamp(ostream& o) { print_dupe_stamp_unprivileged_process_owner (o); } |
c0f84e7b SC |
500 | void getargs(std::list<std::string> &arg_set) const; |
501 | void saveargs(int nargs); | |
502 | private: | |
503 | list<string> args; | |
6d0f3f0c FCE |
504 | }; |
505 | ||
dc38c0ae DS |
506 | struct dwarf_derived_probe_group: public derived_probe_group |
507 | { | |
508 | private: | |
62f52bb0 | 509 | bool has_semaphores; |
b20febf3 FCE |
510 | multimap<string,dwarf_derived_probe*> probes_by_module; |
511 | typedef multimap<string,dwarf_derived_probe*>::iterator p_b_m_iterator; | |
dc38c0ae DS |
512 | |
513 | public: | |
62f52bb0 | 514 | dwarf_derived_probe_group(): has_semaphores(false) {} |
b20febf3 FCE |
515 | void enroll (dwarf_derived_probe* probe); |
516 | void emit_module_decls (systemtap_session& s); | |
517 | void emit_module_init (systemtap_session& s); | |
b4be7cbc | 518 | void emit_module_refresh (systemtap_session& s); |
b20febf3 | 519 | void emit_module_exit (systemtap_session& s); |
dc38c0ae DS |
520 | }; |
521 | ||
522 | ||
20c6c071 | 523 | // Helper struct to thread through the dwfl callbacks. |
2c384610 | 524 | struct base_query |
20c6c071 | 525 | { |
c4ce66a1 JS |
526 | base_query(dwflpp & dw, literal_map_t const & params); |
527 | base_query(dwflpp & dw, const string & module_val); | |
2c384610 | 528 | virtual ~base_query() {} |
bd2b1e68 | 529 | |
5227f1ea | 530 | systemtap_session & sess; |
2c384610 | 531 | dwflpp & dw; |
5227f1ea | 532 | |
bd2b1e68 | 533 | // Parameter extractors. |
86bf665e | 534 | static bool has_null_param(literal_map_t const & params, |
888af770 | 535 | string const & k); |
86bf665e | 536 | static bool get_string_param(literal_map_t const & params, |
bd2b1e68 | 537 | string const & k, string & v); |
86bf665e | 538 | static bool get_number_param(literal_map_t const & params, |
bd2b1e68 | 539 | string const & k, long & v); |
86bf665e | 540 | static bool get_number_param(literal_map_t const & params, |
c239d28c | 541 | string const & k, Dwarf_Addr & v); |
f301a9ff | 542 | static void query_library_callback (void *object, const char *data); |
576eaefe | 543 | static void query_plt_callback (void *object, const char *link, size_t addr); |
f301a9ff | 544 | virtual void query_library (const char *data) = 0; |
576eaefe | 545 | virtual void query_plt (const char *link, size_t addr) = 0; |
84c84ac4 | 546 | |
b55bc428 | 547 | |
2c384610 DS |
548 | // Extracted parameters. |
549 | bool has_kernel; | |
91af0778 FCE |
550 | bool has_module; |
551 | bool has_process; | |
63b4fd14 | 552 | bool has_library; |
576eaefe SC |
553 | bool has_plt; |
554 | bool has_statement; | |
2c384610 | 555 | string module_val; // has_kernel => module_val = "kernel" |
63b4fd14 | 556 | string path; // executable path if module is a .so |
576eaefe | 557 | string plt_val; // has_plt => plt wildcard |
2c384610 DS |
558 | |
559 | virtual void handle_query_module() = 0; | |
560 | }; | |
561 | ||
562 | ||
c4ce66a1 | 563 | base_query::base_query(dwflpp & dw, literal_map_t const & params): |
576eaefe | 564 | sess(dw.sess), dw(dw), has_library(false), has_plt(false), has_statement(false) |
2c384610 | 565 | { |
91af0778 | 566 | has_kernel = has_null_param (params, TOK_KERNEL); |
2c384610 DS |
567 | if (has_kernel) |
568 | module_val = "kernel"; | |
91af0778 FCE |
569 | |
570 | has_module = get_string_param (params, TOK_MODULE, module_val); | |
571 | if (has_module) | |
572 | has_process = false; | |
4baf0e53 | 573 | else |
d0a7f5a9 | 574 | { |
63b4fd14 | 575 | string library_name; |
576eaefe | 576 | long statement_num_val; |
d0a7f5a9 | 577 | has_process = get_string_param(params, TOK_PROCESS, module_val); |
63b4fd14 | 578 | has_library = get_string_param (params, TOK_LIBRARY, library_name); |
576eaefe SC |
579 | if ((has_plt = has_null_param (params, TOK_PLT))) |
580 | plt_val = "*"; | |
581 | else has_plt = get_string_param (params, TOK_PLT, plt_val); | |
18418d34 SC |
582 | if (has_plt) |
583 | sess.consult_symtab = true; | |
576eaefe SC |
584 | has_statement = get_number_param(params, TOK_STATEMENT, statement_num_val); |
585 | ||
84c84ac4 | 586 | if (has_process) |
05fb3e0c | 587 | module_val = find_executable (module_val, sess.sysroot, sess.sysenv); |
84c84ac4 SC |
588 | if (has_library) |
589 | { | |
590 | if (! contains_glob_chars (library_name)) | |
591 | { | |
05fb3e0c WF |
592 | path = path_remove_sysroot(sess, module_val); |
593 | module_val = find_executable (library_name, sess.sysroot, | |
594 | sess.sysenv, "LD_LIBRARY_PATH"); | |
47e226ed SC |
595 | if (module_val.find('/') == string::npos) |
596 | { | |
597 | // We didn't find library_name so use iterate_over_libraries | |
598 | module_val = path; | |
599 | path = library_name; | |
600 | } | |
84c84ac4 SC |
601 | } |
602 | else | |
603 | path = library_name; | |
604 | } | |
d0a7f5a9 | 605 | } |
91af0778 FCE |
606 | |
607 | assert (has_kernel || has_process || has_module); | |
2c384610 DS |
608 | } |
609 | ||
c4ce66a1 | 610 | base_query::base_query(dwflpp & dw, const string & module_val) |
576eaefe SC |
611 | : sess(dw.sess), dw(dw), has_library(false), has_plt(false), has_statement(false), |
612 | module_val(module_val) | |
c4ce66a1 JS |
613 | { |
614 | // NB: This uses '/' to distinguish between kernel modules and userspace, | |
615 | // which means that userspace modules won't get any PATH searching. | |
616 | if (module_val.find('/') == string::npos) | |
617 | { | |
618 | has_kernel = (module_val == TOK_KERNEL); | |
619 | has_module = !has_kernel; | |
620 | has_process = false; | |
621 | } | |
622 | else | |
623 | { | |
624 | has_kernel = has_module = false; | |
625 | has_process = true; | |
626 | } | |
627 | } | |
628 | ||
2c384610 | 629 | bool |
86bf665e | 630 | base_query::has_null_param(literal_map_t const & params, |
2c384610 DS |
631 | string const & k) |
632 | { | |
888af770 | 633 | return derived_probe_builder::has_null_param(params, k); |
2c384610 DS |
634 | } |
635 | ||
636 | ||
637 | bool | |
86bf665e | 638 | base_query::get_string_param(literal_map_t const & params, |
2c384610 DS |
639 | string const & k, string & v) |
640 | { | |
641 | return derived_probe_builder::get_param (params, k, v); | |
642 | } | |
643 | ||
644 | ||
645 | bool | |
86bf665e | 646 | base_query::get_number_param(literal_map_t const & params, |
2c384610 DS |
647 | string const & k, long & v) |
648 | { | |
649 | int64_t value; | |
650 | bool present = derived_probe_builder::get_param (params, k, value); | |
651 | v = (long) value; | |
652 | return present; | |
653 | } | |
654 | ||
655 | ||
656 | bool | |
86bf665e | 657 | base_query::get_number_param(literal_map_t const & params, |
2c384610 DS |
658 | string const & k, Dwarf_Addr & v) |
659 | { | |
660 | int64_t value; | |
661 | bool present = derived_probe_builder::get_param (params, k, value); | |
662 | v = (Dwarf_Addr) value; | |
663 | return present; | |
664 | } | |
665 | ||
2c384610 DS |
666 | struct dwarf_query : public base_query |
667 | { | |
e1278bd4 | 668 | dwarf_query(probe * base_probe, |
2c384610 DS |
669 | probe_point * base_loc, |
670 | dwflpp & dw, | |
86bf665e | 671 | literal_map_t const & params, |
b642c901 SC |
672 | vector<derived_probe *> & results, |
673 | const string user_path, | |
674 | const string user_lib); | |
2c384610 | 675 | |
c4ce66a1 | 676 | vector<derived_probe *> & results; |
8f14e444 | 677 | set<string> inlined_non_returnable; // function names |
c4ce66a1 JS |
678 | probe * base_probe; |
679 | probe_point * base_loc; | |
b642c901 SC |
680 | string user_path; |
681 | string user_lib; | |
c4ce66a1 | 682 | |
2c384610 | 683 | virtual void handle_query_module(); |
5f0a03a6 JK |
684 | void query_module_dwarf(); |
685 | void query_module_symtab(); | |
5d5bd369 | 686 | void query_library (const char *data); |
576eaefe | 687 | void query_plt (const char *entry, size_t addr); |
2c384610 | 688 | |
2930abc7 FCE |
689 | void add_probe_point(string const & funcname, |
690 | char const * filename, | |
691 | int line, | |
692 | Dwarf_Die *scope_die, | |
693 | Dwarf_Addr addr); | |
36f9dd1d | 694 | |
857bdfd1 JS |
695 | // Track addresses we've already seen in a given module |
696 | set<Dwarf_Addr> alias_dupes; | |
697 | ||
7fdd3e2c JS |
698 | // Track inlines we've already seen as well |
699 | // NB: this can't be compared just by entrypc, as inlines can overlap | |
700 | set<inline_instance_info> inline_dupes; | |
701 | ||
2930abc7 | 702 | // Extracted parameters. |
7a053d3b | 703 | string function_val; |
20c6c071 GH |
704 | |
705 | bool has_function_str; | |
706 | bool has_statement_str; | |
707 | bool has_function_num; | |
708 | bool has_statement_num; | |
7a053d3b RM |
709 | string statement_str_val; |
710 | string function_str_val; | |
c239d28c GH |
711 | Dwarf_Addr statement_num_val; |
712 | Dwarf_Addr function_num_val; | |
20c6c071 | 713 | |
b8da0ad1 | 714 | bool has_call; |
4bda987e | 715 | bool has_exported; |
b8da0ad1 | 716 | bool has_inline; |
20c6c071 GH |
717 | bool has_return; |
718 | ||
c9bad430 DS |
719 | bool has_maxactive; |
720 | long maxactive_val; | |
721 | ||
20c6c071 GH |
722 | bool has_label; |
723 | string label_val; | |
724 | ||
725 | bool has_relative; | |
726 | long relative_val; | |
727 | ||
37ebca01 FCE |
728 | bool has_absolute; |
729 | ||
467bea43 SC |
730 | bool has_mark; |
731 | ||
5f0a03a6 JK |
732 | enum dbinfo_reqt dbinfo_reqt; |
733 | enum dbinfo_reqt assess_dbinfo_reqt(); | |
734 | ||
7d6d0afc | 735 | void parse_function_spec(const string & spec); |
20c6c071 | 736 | function_spec_type spec_type; |
7d6d0afc | 737 | vector<string> scopes; |
20c6c071 GH |
738 | string function; |
739 | string file; | |
0c8b7d37 | 740 | line_t line_type; |
879eb9e9 | 741 | int line[2]; |
5f0a03a6 | 742 | bool query_done; // Found exact match |
20c6c071 | 743 | |
bd25380d | 744 | set<string> filtered_srcfiles; |
7e1279ea FCE |
745 | |
746 | // Map official entrypc -> func_info object | |
86bf665e TM |
747 | inline_instance_map_t filtered_inlines; |
748 | func_info_map_t filtered_functions; | |
7e1279ea FCE |
749 | bool choose_next_line; |
750 | Dwarf_Addr entrypc_for_next_line; | |
4df79aaf JS |
751 | |
752 | void query_module_functions (); | |
b55bc428 FCE |
753 | }; |
754 | ||
98afd80e | 755 | |
435f53a7 FCE |
756 | static void delete_session_module_cache (systemtap_session& s); // forward decl |
757 | ||
758 | ||
98afd80e | 759 | struct dwarf_builder: public derived_probe_builder |
b55bc428 | 760 | { |
665e1256 | 761 | map <string,dwflpp*> kern_dw; /* NB: key string could be a wildcard */ |
7a24d422 | 762 | map <string,dwflpp*> user_dw; |
b642c901 SC |
763 | string user_path; |
764 | string user_lib; | |
ae2552da | 765 | dwarf_builder() {} |
aa30ccd3 | 766 | |
ae2552da | 767 | dwflpp *get_kern_dw(systemtap_session& sess, const string& module) |
707bf35e | 768 | { |
ea14cf67 FCE |
769 | if (kern_dw[module] == 0) |
770 | kern_dw[module] = new dwflpp(sess, module, true); // might throw | |
ae2552da | 771 | return kern_dw[module]; |
707bf35e JS |
772 | } |
773 | ||
774 | dwflpp *get_user_dw(systemtap_session& sess, const string& module) | |
775 | { | |
ea14cf67 FCE |
776 | if (user_dw[module] == 0) |
777 | user_dw[module] = new dwflpp(sess, module, false); // might throw | |
707bf35e JS |
778 | return user_dw[module]; |
779 | } | |
7a24d422 FCE |
780 | |
781 | /* NB: not virtual, so can be called from dtor too: */ | |
822a6a3d | 782 | void dwarf_build_no_more (bool) |
aa30ccd3 | 783 | { |
435f53a7 FCE |
784 | delete_map(kern_dw); |
785 | delete_map(user_dw); | |
7a24d422 FCE |
786 | } |
787 | ||
788 | void build_no_more (systemtap_session &s) | |
789 | { | |
790 | dwarf_build_no_more (s.verbose > 3); | |
435f53a7 | 791 | delete_session_module_cache (s); |
aa30ccd3 FCE |
792 | } |
793 | ||
e38d6504 RM |
794 | ~dwarf_builder() |
795 | { | |
7a24d422 | 796 | dwarf_build_no_more (false); |
c8959a29 | 797 | } |
aa30ccd3 | 798 | |
5227f1ea | 799 | virtual void build(systemtap_session & sess, |
7a053d3b | 800 | probe * base, |
20c6c071 | 801 | probe_point * location, |
86bf665e | 802 | literal_map_t const & parameters, |
20c6c071 | 803 | vector<derived_probe *> & finished_results); |
b55bc428 FCE |
804 | }; |
805 | ||
5111fc3e | 806 | |
e1278bd4 | 807 | dwarf_query::dwarf_query(probe * base_probe, |
20c6c071 GH |
808 | probe_point * base_loc, |
809 | dwflpp & dw, | |
86bf665e | 810 | literal_map_t const & params, |
b642c901 SC |
811 | vector<derived_probe *> & results, |
812 | const string user_path, | |
813 | const string user_lib) | |
c4ce66a1 | 814 | : base_query(dw, params), results(results), |
b642c901 | 815 | base_probe(base_probe), base_loc(base_loc), |
74fe61bc LB |
816 | user_path(user_path), user_lib(user_lib), has_relative(false), |
817 | relative_val(0), choose_next_line(false), entrypc_for_next_line(0) | |
bd2b1e68 GH |
818 | { |
819 | // Reduce the query to more reasonable semantic values (booleans, | |
820 | // extracted strings, numbers, etc). | |
bd2b1e68 GH |
821 | has_function_str = get_string_param(params, TOK_FUNCTION, function_str_val); |
822 | has_function_num = get_number_param(params, TOK_FUNCTION, function_num_val); | |
823 | ||
824 | has_statement_str = get_string_param(params, TOK_STATEMENT, statement_str_val); | |
825 | has_statement_num = get_number_param(params, TOK_STATEMENT, statement_num_val); | |
826 | ||
0f336e95 SC |
827 | has_label = get_string_param(params, TOK_LABEL, label_val); |
828 | ||
b8da0ad1 | 829 | has_call = has_null_param(params, TOK_CALL); |
4bda987e | 830 | has_exported = has_null_param(params, TOK_EXPORTED); |
b8da0ad1 | 831 | has_inline = has_null_param(params, TOK_INLINE); |
bd2b1e68 | 832 | has_return = has_null_param(params, TOK_RETURN); |
c9bad430 | 833 | has_maxactive = get_number_param(params, TOK_MAXACTIVE, maxactive_val); |
37ebca01 | 834 | has_absolute = has_null_param(params, TOK_ABSOLUTE); |
467bea43 | 835 | has_mark = false; |
37ebca01 | 836 | |
bd2b1e68 | 837 | if (has_function_str) |
7d6d0afc | 838 | parse_function_spec(function_str_val); |
bd2b1e68 | 839 | else if (has_statement_str) |
7d6d0afc | 840 | parse_function_spec(statement_str_val); |
0daad364 | 841 | |
5f0a03a6 JK |
842 | dbinfo_reqt = assess_dbinfo_reqt(); |
843 | query_done = false; | |
0daad364 JS |
844 | } |
845 | ||
846 | ||
440f755a JS |
847 | func_info_map_t * |
848 | get_filtered_functions(dwarf_query *q) | |
849 | { | |
850 | return &q->filtered_functions; | |
851 | } | |
852 | ||
853 | ||
854 | inline_instance_map_t * | |
855 | get_filtered_inlines(dwarf_query *q) | |
856 | { | |
857 | return &q->filtered_inlines; | |
858 | } | |
859 | ||
860 | ||
2c384610 | 861 | void |
5f0a03a6 | 862 | dwarf_query::query_module_dwarf() |
2c384610 DS |
863 | { |
864 | if (has_function_num || has_statement_num) | |
865 | { | |
866 | // If we have module("foo").function(0xbeef) or | |
867 | // module("foo").statement(0xbeef), the address is relative | |
868 | // to the start of the module, so we seek the function | |
869 | // number plus the module's bias. | |
6b517475 JS |
870 | Dwarf_Addr addr = has_function_num ? |
871 | function_num_val : statement_num_val; | |
08d1d520 MW |
872 | |
873 | // These are raw addresses, we need to know what the elf_bias | |
874 | // is to feed it to libdwfl based functions. | |
875 | Dwarf_Addr elf_bias; | |
876 | Elf *elf = dwfl_module_getelf (dw.module, &elf_bias); | |
877 | assert(elf); | |
878 | addr += elf_bias; | |
6b517475 | 879 | query_addr(addr, this); |
2c384610 DS |
880 | } |
881 | else | |
882 | { | |
883 | // Otherwise if we have a function("foo") or statement("foo") | |
884 | // specifier, we have to scan over all the CUs looking for | |
885 | // the function(s) in question | |
886 | assert(has_function_str || has_statement_str); | |
4df79aaf JS |
887 | |
888 | // For simple cases, no wildcard and no source:line, we can do a very | |
889 | // quick function lookup in a module-wide cache. | |
1ffb8bd1 JS |
890 | if (spec_type == function_alone && |
891 | !dw.name_has_wildcard(function) && | |
892 | !startswith(function, "_Z")) | |
4df79aaf JS |
893 | query_module_functions(); |
894 | else | |
337b7c44 | 895 | dw.iterate_over_cus(&query_cu, this, false); |
2c384610 DS |
896 | } |
897 | } | |
898 | ||
5f0a03a6 JK |
899 | static void query_func_info (Dwarf_Addr entrypc, func_info & fi, |
900 | dwarf_query * q); | |
901 | ||
902 | void | |
903 | dwarf_query::query_module_symtab() | |
904 | { | |
905 | // Get the symbol table if it's necessary, sufficient, and not already got. | |
906 | if (dbinfo_reqt == dbr_need_dwarf) | |
907 | return; | |
908 | ||
909 | module_info *mi = dw.mod_info; | |
910 | if (dbinfo_reqt == dbr_need_symtab) | |
911 | { | |
912 | if (mi->symtab_status == info_unknown) | |
913 | mi->get_symtab(this); | |
914 | if (mi->symtab_status == info_absent) | |
915 | return; | |
916 | } | |
917 | ||
918 | func_info *fi = NULL; | |
919 | symbol_table *sym_table = mi->sym_table; | |
920 | ||
921 | if (has_function_str) | |
922 | { | |
923 | // Per dwarf_query::assess_dbinfo_reqt()... | |
924 | assert(spec_type == function_alone); | |
925 | if (dw.name_has_wildcard(function_str_val)) | |
926 | { | |
927 | // Until we augment the blacklist sufficently... | |
928 | if (function_str_val.find_first_not_of("*?") == string::npos) | |
929 | { | |
930 | // e.g., kernel.function("*") | |
b530b5b3 LB |
931 | cerr << _F("Error: Pattern '%s' matches every single " |
932 | "instruction address in the symbol table,\n" | |
933 | "some of which aren't even functions.\n", function_str_val.c_str()) << endl; | |
5f0a03a6 JK |
934 | return; |
935 | } | |
2e67a43b | 936 | symbol_table::iterator_t iter; |
1c6b77e5 JS |
937 | for (iter = sym_table->map_by_addr.begin(); |
938 | iter != sym_table->map_by_addr.end(); | |
2e67a43b | 939 | ++iter) |
5f0a03a6 | 940 | { |
1c6b77e5 | 941 | fi = iter->second; |
5f0a03a6 JK |
942 | if (!null_die(&fi->die)) |
943 | continue; // already handled in query_module_dwarf() | |
944 | if (dw.function_name_matches_pattern(fi->name, function_str_val)) | |
945 | query_func_info(fi->addr, *fi, this); | |
946 | } | |
947 | } | |
948 | else | |
949 | { | |
950 | fi = sym_table->lookup_symbol(function_str_val); | |
2867a2a1 | 951 | if (fi && !fi->descriptor && null_die(&fi->die)) |
5f0a03a6 JK |
952 | query_func_info(fi->addr, *fi, this); |
953 | } | |
954 | } | |
955 | else | |
956 | { | |
957 | assert(has_function_num || has_statement_num); | |
958 | // Find the "function" in which the indicated address resides. | |
959 | Dwarf_Addr addr = | |
960 | (has_function_num ? function_num_val : statement_num_val); | |
576eaefe | 961 | if (has_plt) |
3d372d6b SC |
962 | { |
963 | // Use the raw address from the .plt | |
964 | fi = sym_table->get_first_func(); | |
965 | fi->addr = addr; | |
966 | } | |
967 | else | |
968 | fi = sym_table->get_func_containing_address(addr); | |
969 | ||
5f0a03a6 JK |
970 | if (!fi) |
971 | { | |
2713ea24 CM |
972 | sess.print_warning(_F("address %#" PRIx64 " out of range for module %s", |
973 | addr, dw.module_name.c_str())); | |
974 | return; | |
5f0a03a6 JK |
975 | } |
976 | if (!null_die(&fi->die)) | |
977 | { | |
978 | // addr looks like it's in the compilation unit containing | |
979 | // the indicated function, but query_module_dwarf() didn't | |
980 | // match addr to any compilation unit, so addr must be | |
981 | // above that cu's address range. | |
2713ea24 CM |
982 | sess.print_warning(_F("address %#" PRIx64 " maps to no known compilation unit in module %s", |
983 | addr, dw.module_name.c_str())); | |
5f0a03a6 JK |
984 | return; |
985 | } | |
986 | query_func_info(fi->addr, *fi, this); | |
987 | } | |
988 | } | |
989 | ||
990 | void | |
991 | dwarf_query::handle_query_module() | |
992 | { | |
1c6b77e5 JS |
993 | bool report = dbinfo_reqt == dbr_need_dwarf || !sess.consult_symtab; |
994 | dw.get_module_dwarf(false, report); | |
995 | ||
996 | // prebuild the symbol table to resolve aliases | |
997 | dw.mod_info->get_symtab(this); | |
998 | ||
857bdfd1 JS |
999 | // reset the dupe-checking for each new module |
1000 | alias_dupes.clear(); | |
7fdd3e2c | 1001 | inline_dupes.clear(); |
857bdfd1 | 1002 | |
5f0a03a6 JK |
1003 | if (dw.mod_info->dwarf_status == info_present) |
1004 | query_module_dwarf(); | |
1c6b77e5 | 1005 | |
5f0a03a6 JK |
1006 | // Consult the symbol table if we haven't found all we're looking for. |
1007 | // asm functions can show up in the symbol table but not in dwarf. | |
1008 | if (sess.consult_symtab && !query_done) | |
1009 | query_module_symtab(); | |
1010 | } | |
1011 | ||
2c384610 | 1012 | |
7d6d0afc JS |
1013 | void |
1014 | dwarf_query::parse_function_spec(const string & spec) | |
bd2b1e68 | 1015 | { |
1d12a9b2 JS |
1016 | line_type = ABSOLUTE; |
1017 | line[0] = line[1] = 0; | |
1018 | ||
91699a70 | 1019 | size_t src_pos, line_pos, dash_pos, scope_pos; |
bd2b1e68 | 1020 | |
7d6d0afc | 1021 | // look for named scopes |
91699a70 JS |
1022 | scope_pos = spec.rfind("::"); |
1023 | if (scope_pos != string::npos) | |
bd2b1e68 | 1024 | { |
91699a70 JS |
1025 | tokenize_cxx(spec.substr(0, scope_pos), scopes); |
1026 | scope_pos += 2; | |
bd2b1e68 | 1027 | } |
91699a70 JS |
1028 | else |
1029 | scope_pos = 0; | |
bd2b1e68 | 1030 | |
7d6d0afc JS |
1031 | // look for a source separator |
1032 | src_pos = spec.find('@', scope_pos); | |
1033 | if (src_pos == string::npos) | |
bd2b1e68 | 1034 | { |
7d6d0afc JS |
1035 | function = spec.substr(scope_pos); |
1036 | spec_type = function_alone; | |
bd2b1e68 | 1037 | } |
7d6d0afc | 1038 | else |
879eb9e9 | 1039 | { |
7d6d0afc | 1040 | function = spec.substr(scope_pos, src_pos - scope_pos); |
7a053d3b | 1041 | |
7d6d0afc JS |
1042 | // look for a line-number separator |
1043 | line_pos = spec.find_first_of(":+", src_pos); | |
1044 | if (line_pos == string::npos) | |
1045 | { | |
1046 | file = spec.substr(src_pos + 1); | |
1047 | spec_type = function_and_file; | |
1048 | } | |
1049 | else | |
1050 | { | |
1051 | file = spec.substr(src_pos + 1, line_pos - src_pos - 1); | |
1052 | ||
1053 | // classify the line spec | |
1054 | spec_type = function_file_and_line; | |
1055 | if (spec[line_pos] == '+') | |
1056 | line_type = RELATIVE; | |
1057 | else if (spec[line_pos + 1] == '*' && | |
1058 | spec.length() == line_pos + 2) | |
1059 | line_type = WILDCARD; | |
1060 | else | |
1061 | line_type = ABSOLUTE; | |
1062 | ||
1063 | if (line_type != WILDCARD) | |
1064 | try | |
1065 | { | |
1066 | // try to parse either N or N-M | |
1067 | dash_pos = spec.find('-', line_pos + 1); | |
1068 | if (dash_pos == string::npos) | |
1069 | line[0] = line[1] = lex_cast<int>(spec.substr(line_pos + 1)); | |
1070 | else | |
1071 | { | |
1072 | line_type = RANGE; | |
1073 | line[0] = lex_cast<int>(spec.substr(line_pos + 1, | |
1074 | dash_pos - line_pos - 1)); | |
1075 | line[1] = lex_cast<int>(spec.substr(dash_pos + 1)); | |
1076 | } | |
1077 | } | |
1078 | catch (runtime_error & exn) | |
1079 | { | |
1080 | goto bad; | |
1081 | } | |
1082 | } | |
bd2b1e68 GH |
1083 | } |
1084 | ||
7d6d0afc JS |
1085 | if (function.empty() || |
1086 | (spec_type != function_alone && file.empty())) | |
bd2b1e68 GH |
1087 | goto bad; |
1088 | ||
7d6d0afc | 1089 | if (sess.verbose > 2) |
bd2b1e68 | 1090 | { |
b530b5b3 LB |
1091 | //clog << "parsed '" << spec << "'"; |
1092 | clog << _F("parse '%s'", spec.c_str()); | |
41c262f3 | 1093 | |
7d6d0afc JS |
1094 | if (!scopes.empty()) |
1095 | clog << ", scope '" << scopes[0] << "'"; | |
1096 | for (unsigned i = 1; i < scopes.size(); ++i) | |
1097 | clog << "::'" << scopes[i] << "'"; | |
41c262f3 | 1098 | |
7d6d0afc JS |
1099 | clog << ", func '" << function << "'"; |
1100 | ||
1101 | if (spec_type != function_alone) | |
1102 | clog << ", file '" << file << "'"; | |
1103 | ||
1104 | if (spec_type == function_file_and_line) | |
1105 | { | |
1106 | clog << ", line "; | |
1107 | switch (line_type) | |
1108 | { | |
1109 | case ABSOLUTE: | |
1110 | clog << line[0]; | |
1111 | break; | |
1112 | ||
1113 | case RELATIVE: | |
1114 | clog << "+" << line[0]; | |
1115 | break; | |
1116 | ||
1117 | case RANGE: | |
1118 | clog << line[0] << " - " << line[1]; | |
1119 | break; | |
1120 | ||
1121 | case WILDCARD: | |
1122 | clog << "*"; | |
1123 | break; | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | clog << endl; | |
bd2b1e68 GH |
1128 | } |
1129 | ||
7d6d0afc JS |
1130 | return; |
1131 | ||
1132 | bad: | |
b530b5b3 | 1133 | throw semantic_error(_F("malformed specification '%s'", spec.c_str()), |
7d6d0afc | 1134 | base_probe->tok); |
bd2b1e68 GH |
1135 | } |
1136 | ||
05fb3e0c WF |
1137 | string path_remove_sysroot(const systemtap_session& sess, const string& path) |
1138 | { | |
1139 | size_t pos; | |
1140 | string retval = path; | |
1141 | if (!sess.sysroot.empty() && | |
1142 | (pos = retval.find(sess.sysroot)) != string::npos) | |
1143 | retval.replace(pos, sess.sysroot.length(), "/"); | |
1144 | return retval; | |
1145 | } | |
bd2b1e68 | 1146 | |
36f9dd1d | 1147 | void |
1ffb8bd1 | 1148 | dwarf_query::add_probe_point(const string& dw_funcname, |
b20febf3 | 1149 | const char* filename, |
36f9dd1d | 1150 | int line, |
b20febf3 | 1151 | Dwarf_Die* scope_die, |
36f9dd1d FCE |
1152 | Dwarf_Addr addr) |
1153 | { | |
b20febf3 | 1154 | string reloc_section; // base section for relocation purposes |
27646582 | 1155 | Dwarf_Addr reloc_addr; // relocated |
b20febf3 | 1156 | const string& module = dw.module_name; // "kernel" or other |
1ffb8bd1 | 1157 | string funcname = dw_funcname; |
36f9dd1d | 1158 | |
37ebca01 FCE |
1159 | assert (! has_absolute); // already handled in dwarf_builder::build() |
1160 | ||
576eaefe SC |
1161 | if (!has_plt) |
1162 | reloc_addr = dw.relocate_address(addr, reloc_section); | |
1163 | else | |
1164 | { | |
3d372d6b | 1165 | // Set the reloc_section but use the plt entry for reloc_addr |
576eaefe SC |
1166 | dw.relocate_address(addr, reloc_section); |
1167 | reloc_addr = addr; | |
1168 | } | |
2930abc7 | 1169 | |
1ffb8bd1 | 1170 | // If we originally used the linkage name, then let's call it that way |
1ffb8bd1 JS |
1171 | const char* linkage_name; |
1172 | if (scope_die && startswith (this->function, "_Z") | |
f450a7e3 | 1173 | && (linkage_name = dwarf_linkage_name (scope_die))) |
1ffb8bd1 JS |
1174 | funcname = linkage_name; |
1175 | ||
7f9f3386 FCE |
1176 | if (sess.verbose > 1) |
1177 | { | |
b530b5b3 | 1178 | clog << _("probe ") << funcname << "@" << filename << ":" << line; |
b20febf3 | 1179 | if (string(module) == TOK_KERNEL) |
b530b5b3 | 1180 | clog << _(" kernel"); |
91af0778 | 1181 | else if (has_module) |
b530b5b3 | 1182 | clog << _(" module=") << module; |
91af0778 | 1183 | else if (has_process) |
b530b5b3 | 1184 | clog << _(" process=") << module; |
b20febf3 | 1185 | if (reloc_section != "") clog << " reloc=" << reloc_section; |
b20febf3 | 1186 | clog << " pc=0x" << hex << addr << dec; |
7f9f3386 | 1187 | } |
4baf0e53 | 1188 | |
27646582 | 1189 | bool bad = dw.blacklisted_p (funcname, filename, line, module, |
789448a3 | 1190 | addr, has_return); |
b20febf3 FCE |
1191 | if (sess.verbose > 1) |
1192 | clog << endl; | |
7f9f3386 | 1193 | |
84048984 FCE |
1194 | if (module == TOK_KERNEL) |
1195 | { | |
1196 | // PR 4224: adapt to relocatable kernel by subtracting the _stext address here. | |
1197 | reloc_addr = addr - sess.sym_stext; | |
37ebca01 | 1198 | reloc_section = "_stext"; // a message to runtime's _stp_module_relocate |
84048984 FCE |
1199 | } |
1200 | ||
b20febf3 FCE |
1201 | if (! bad) |
1202 | { | |
1a0dbc5a | 1203 | sess.unwindsym_modules.insert (module); |
6d0f3f0c FCE |
1204 | |
1205 | if (has_process) | |
1206 | { | |
05fb3e0c | 1207 | string module_tgt = path_remove_sysroot(sess, module); |
6d0f3f0c | 1208 | results.push_back (new uprobe_derived_probe(funcname, filename, line, |
05fb3e0c | 1209 | module_tgt, reloc_section, addr, reloc_addr, |
6d0f3f0c FCE |
1210 | *this, scope_die)); |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | assert (has_kernel || has_module); | |
1215 | results.push_back (new dwarf_derived_probe(funcname, filename, line, | |
06aca46a | 1216 | module, reloc_section, addr, reloc_addr, |
6d0f3f0c FCE |
1217 | *this, scope_die)); |
1218 | } | |
b20febf3 | 1219 | } |
2930abc7 FCE |
1220 | } |
1221 | ||
5f0a03a6 JK |
1222 | enum dbinfo_reqt |
1223 | dwarf_query::assess_dbinfo_reqt() | |
1224 | { | |
1225 | if (has_absolute) | |
1226 | { | |
1227 | // kernel.statement(NUM).absolute | |
1228 | return dbr_none; | |
1229 | } | |
1230 | if (has_inline) | |
1231 | { | |
1232 | // kernel.function("f").inline or module("m").function("f").inline | |
1233 | return dbr_need_dwarf; | |
1234 | } | |
1235 | if (has_function_str && spec_type == function_alone) | |
1236 | { | |
1237 | // kernel.function("f") or module("m").function("f") | |
1238 | return dbr_need_symtab; | |
1239 | } | |
1240 | if (has_statement_num) | |
1241 | { | |
1242 | // kernel.statement(NUM) or module("m").statement(NUM) | |
1243 | // Technically, all we need is the module offset (or _stext, for | |
1244 | // the kernel). But for that we need either the ELF file or (for | |
1245 | // _stext) the symbol table. In either case, the symbol table | |
1246 | // is available, and that allows us to map the NUM (address) | |
1247 | // to a function, which is goodness. | |
1248 | return dbr_need_symtab; | |
1249 | } | |
1250 | if (has_function_num) | |
1251 | { | |
1252 | // kernel.function(NUM) or module("m").function(NUM) | |
1253 | // Need the symbol table so we can back up from NUM to the | |
1254 | // start of the function. | |
1255 | return dbr_need_symtab; | |
1256 | } | |
1257 | // Symbol table tells us nothing about source files or line numbers. | |
1258 | return dbr_need_dwarf; | |
1259 | } | |
2930abc7 FCE |
1260 | |
1261 | ||
b8da0ad1 FCE |
1262 | // The critical determining factor when interpreting a pattern |
1263 | // string is, perhaps surprisingly: "presence of a lineno". The | |
1264 | // presence of a lineno changes the search strategy completely. | |
1265 | // | |
1266 | // Compare the two cases: | |
1267 | // | |
1268 | // 1. {statement,function}(foo@file.c:lineno) | |
1269 | // - find the files matching file.c | |
1270 | // - in each file, find the functions matching foo | |
1271 | // - query the file for line records matching lineno | |
1272 | // - iterate over the line records, | |
1273 | // - and iterate over the functions, | |
1274 | // - if(haspc(function.DIE, line.addr)) | |
1275 | // - if looking for statements: probe(lineno.addr) | |
1276 | // - if looking for functions: probe(function.{entrypc,return,etc.}) | |
1277 | // | |
1278 | // 2. {statement,function}(foo@file.c) | |
1279 | // - find the files matching file.c | |
1280 | // - in each file, find the functions matching foo | |
1281 | // - probe(function.{entrypc,return,etc.}) | |
1282 | // | |
1283 | // Thus the first decision we make is based on the presence of a | |
1284 | // lineno, and we enter entirely different sets of callbacks | |
1285 | // depending on that decision. | |
1286 | // | |
1287 | // Note that the first case is a generalization fo the second, in that | |
1288 | // we could theoretically search through line records for matching | |
1289 | // file names (a "table scan" in rdbms lingo). Luckily, file names | |
1290 | // are already cached elsewhere, so we can do an "index scan" as an | |
1291 | // optimization. | |
7e1279ea | 1292 | |
bd2b1e68 | 1293 | static void |
4cd232e4 | 1294 | query_statement (string const & func, |
20e4a32c | 1295 | char const * file, |
4cd232e4 | 1296 | int line, |
bcc12710 | 1297 | Dwarf_Die *scope_die, |
20e4a32c | 1298 | Dwarf_Addr stmt_addr, |
4cd232e4 | 1299 | dwarf_query * q) |
bd2b1e68 | 1300 | { |
39bcd429 FCE |
1301 | try |
1302 | { | |
cee35f73 | 1303 | q->add_probe_point(func, file ? file : "", |
a9b2f3a5 | 1304 | line, scope_die, stmt_addr); |
39bcd429 FCE |
1305 | } |
1306 | catch (const semantic_error& e) | |
1307 | { | |
1308 | q->sess.print_error (e); | |
1309 | } | |
bd2b1e68 GH |
1310 | } |
1311 | ||
6b517475 JS |
1312 | static void |
1313 | query_addr(Dwarf_Addr addr, dwarf_query *q) | |
1314 | { | |
1315 | dwflpp &dw = q->dw; | |
1316 | ||
08d1d520 MW |
1317 | if (q->sess.verbose > 2) |
1318 | clog << "query_addr 0x" << hex << addr << dec << endl; | |
6b517475 JS |
1319 | |
1320 | // First pick which CU contains this address | |
1321 | Dwarf_Die* cudie = dw.query_cu_containing_address(addr); | |
1322 | if (!cudie) // address could be wildly out of range | |
1323 | return; | |
1324 | dw.focus_on_cu(cudie); | |
1325 | ||
1326 | // Now compensate for the dw bias | |
1327 | addr -= dw.module_bias; | |
1328 | ||
1329 | // Per PR5787, we look up the scope die even for | |
1330 | // statement_num's, for blacklist sensitivity and $var | |
1331 | // resolution purposes. | |
1332 | ||
1333 | // Find the scopes containing this address | |
1334 | vector<Dwarf_Die> scopes = dw.getscopes(addr); | |
1335 | if (scopes.empty()) | |
1336 | return; | |
1337 | ||
1338 | // Look for the innermost containing function | |
1339 | Dwarf_Die *fnscope = NULL; | |
1340 | for (size_t i = 0; i < scopes.size(); ++i) | |
1341 | { | |
1342 | int tag = dwarf_tag(&scopes[i]); | |
1343 | if ((tag == DW_TAG_subprogram && !q->has_inline) || | |
1344 | (tag == DW_TAG_inlined_subroutine && | |
4bda987e | 1345 | !q->has_call && !q->has_return && !q->has_exported)) |
6b517475 JS |
1346 | { |
1347 | fnscope = &scopes[i]; | |
1348 | break; | |
1349 | } | |
1350 | } | |
1351 | if (!fnscope) | |
1352 | return; | |
1353 | dw.focus_on_function(fnscope); | |
1354 | ||
1355 | Dwarf_Die *scope = q->has_function_num ? fnscope : &scopes[0]; | |
1356 | ||
1357 | const char *file = dwarf_decl_file(fnscope); | |
1358 | int line; | |
1359 | dwarf_decl_line(fnscope, &line); | |
1360 | ||
1361 | // Function probes should reset the addr to the function entry | |
1362 | // and possibly perform prologue searching | |
1363 | if (q->has_function_num) | |
1364 | { | |
1365 | dw.die_entrypc(fnscope, &addr); | |
1366 | if (dwarf_tag(fnscope) == DW_TAG_subprogram && | |
1367 | (q->sess.prologue_searching || q->has_process)) // PR 6871 | |
1368 | { | |
1369 | func_info func; | |
1370 | func.die = *fnscope; | |
1371 | func.name = dw.function_name; | |
1372 | func.decl_file = file; | |
1373 | func.decl_line = line; | |
1374 | func.entrypc = addr; | |
1375 | ||
1376 | func_info_map_t funcs(1, func); | |
1377 | dw.resolve_prologue_endings (funcs); | |
464379bb FCE |
1378 | if (q->has_return) // PR13200 |
1379 | { | |
1380 | if (q->sess.verbose > 2) | |
1381 | clog << "ignoring prologue for .return probes" << endl; | |
1382 | } | |
1383 | else | |
1384 | { | |
1385 | if (funcs[0].prologue_end) | |
1386 | addr = funcs[0].prologue_end; | |
1387 | } | |
6b517475 JS |
1388 | } |
1389 | } | |
1390 | else | |
1391 | { | |
1392 | dwarf_line_t address_line(dwarf_getsrc_die(cudie, addr)); | |
1393 | if (address_line) | |
1394 | { | |
1395 | file = address_line.linesrc(); | |
1396 | line = address_line.lineno(); | |
1397 | } | |
1398 | ||
1399 | // Verify that a raw address matches the beginning of a | |
1400 | // statement. This is a somewhat lame check that the address | |
1401 | // is at the start of an assembly instruction. Mark probes are in the | |
1402 | // middle of a macro and thus not strictly at a statement beginning. | |
1403 | // Guru mode may override this check. | |
1404 | if (!q->has_mark && (!address_line || address_line.addr() != addr)) | |
1405 | { | |
1406 | stringstream msg; | |
2a97f50b | 1407 | msg << _F("address %#" PRIx64 " does not match the beginning of a statement", |
b530b5b3 | 1408 | addr); |
6b517475 | 1409 | if (address_line) |
2a97f50b | 1410 | msg << _F(" (try %#" PRIx64 ")", address_line.addr()); |
6b517475 | 1411 | else |
b530b5b3 LB |
1412 | msg << _F(" (no line info found for '%s', in module '%s')", |
1413 | dw.cu_name().c_str(), dw.module_name.c_str()); | |
6b517475 JS |
1414 | if (! q->sess.guru_mode) |
1415 | throw semantic_error(msg.str()); | |
2713ea24 | 1416 | else |
6b517475 JS |
1417 | q->sess.print_warning(msg.str()); |
1418 | } | |
1419 | } | |
1420 | ||
1421 | // Build a probe at this point | |
1422 | query_statement(dw.function_name, file, line, scope, addr, q); | |
1423 | } | |
1424 | ||
8096dd7d JS |
1425 | static void |
1426 | query_label (string const & func, | |
1427 | char const * label, | |
1428 | char const * file, | |
1429 | int line, | |
1430 | Dwarf_Die *scope_die, | |
1431 | Dwarf_Addr stmt_addr, | |
1432 | dwarf_query * q) | |
1433 | { | |
6b517475 JS |
1434 | assert (q->has_statement_str || q->has_function_str); |
1435 | ||
8096dd7d JS |
1436 | size_t i = q->results.size(); |
1437 | ||
1438 | // weed out functions whose decl_file isn't one of | |
1439 | // the source files that we actually care about | |
6b517475 | 1440 | if (q->spec_type != function_alone && |
8096dd7d JS |
1441 | q->filtered_srcfiles.count(file) == 0) |
1442 | return; | |
1443 | ||
1444 | query_statement(func, file, line, scope_die, stmt_addr, q); | |
1445 | ||
c72aa911 JS |
1446 | // after the fact, insert the label back into the derivation chain |
1447 | probe_point::component* ppc = | |
1448 | new probe_point::component(TOK_LABEL, new literal_string (label)); | |
1449 | for (; i < q->results.size(); ++i) | |
1450 | { | |
1451 | derived_probe* p = q->results[i]; | |
1452 | probe_point* pp = new probe_point(*p->locations[0]); | |
1453 | pp->components.push_back (ppc); | |
1454 | p->base = p->base->create_alias(p->locations[0], pp); | |
1455 | } | |
8096dd7d JS |
1456 | } |
1457 | ||
7e1279ea | 1458 | static void |
3e961ba6 | 1459 | query_inline_instance_info (inline_instance_info & ii, |
7e1279ea FCE |
1460 | dwarf_query * q) |
1461 | { | |
b6581717 | 1462 | try |
7e1279ea | 1463 | { |
8f14e444 FCE |
1464 | assert (! q->has_return); // checked by caller already |
1465 | if (q->sess.verbose>2) | |
b530b5b3 LB |
1466 | clog << _F("querying entrypc %#" PRIx64 " of instance of inline '%s'\n", |
1467 | ii.entrypc, ii.name.c_str()); | |
8f14e444 FCE |
1468 | query_statement (ii.name, ii.decl_file, ii.decl_line, |
1469 | &ii.die, ii.entrypc, q); | |
7e1279ea | 1470 | } |
b6581717 | 1471 | catch (semantic_error &e) |
7e1279ea | 1472 | { |
b6581717 | 1473 | q->sess.print_error (e); |
7e1279ea FCE |
1474 | } |
1475 | } | |
1476 | ||
1477 | static void | |
1478 | query_func_info (Dwarf_Addr entrypc, | |
bcc12710 | 1479 | func_info & fi, |
7e1279ea FCE |
1480 | dwarf_query * q) |
1481 | { | |
b6581717 | 1482 | try |
7e1279ea | 1483 | { |
b6581717 GH |
1484 | if (q->has_return) |
1485 | { | |
1486 | // NB. dwarf_derived_probe::emit_registrations will emit a | |
1487 | // kretprobe based on the entrypc in this case. | |
464379bb FCE |
1488 | if (fi.prologue_end != 0 && q->has_return) // PR13200 |
1489 | { | |
1490 | if (q->sess.verbose > 2) | |
1491 | clog << "ignoring prologue for .return probes" << endl; | |
1492 | } | |
20e4a32c | 1493 | query_statement (fi.name, fi.decl_file, fi.decl_line, |
b6581717 GH |
1494 | &fi.die, entrypc, q); |
1495 | } | |
1496 | else | |
1497 | { | |
35dc8b04 | 1498 | if (fi.prologue_end != 0) |
44f75386 | 1499 | { |
44f75386 FCE |
1500 | query_statement (fi.name, fi.decl_file, fi.decl_line, |
1501 | &fi.die, fi.prologue_end, q); | |
1502 | } | |
1503 | else | |
1504 | { | |
1505 | query_statement (fi.name, fi.decl_file, fi.decl_line, | |
1506 | &fi.die, entrypc, q); | |
1507 | } | |
b6581717 | 1508 | } |
7e1279ea | 1509 | } |
b6581717 | 1510 | catch (semantic_error &e) |
7e1279ea | 1511 | { |
b6581717 | 1512 | q->sess.print_error (e); |
7e1279ea FCE |
1513 | } |
1514 | } | |
1515 | ||
1516 | ||
bd4b874d SC |
1517 | static void |
1518 | query_srcfile_label (const dwarf_line_t& line, void * arg) | |
1519 | { | |
1520 | dwarf_query * q = static_cast<dwarf_query *>(arg); | |
1521 | ||
1522 | Dwarf_Addr addr = line.addr(); | |
1523 | ||
1524 | for (func_info_map_t::iterator i = q->filtered_functions.begin(); | |
1525 | i != q->filtered_functions.end(); ++i) | |
1526 | if (q->dw.die_has_pc (i->die, addr)) | |
f09d0d1e JS |
1527 | q->dw.iterate_over_labels (&i->die, q->label_val, i->name, |
1528 | q, query_label); | |
1529 | ||
1530 | for (inline_instance_map_t::iterator i = q->filtered_inlines.begin(); | |
1531 | i != q->filtered_inlines.end(); ++i) | |
1532 | if (q->dw.die_has_pc (i->die, addr)) | |
1533 | q->dw.iterate_over_labels (&i->die, q->label_val, i->name, | |
1534 | q, query_label); | |
bd4b874d SC |
1535 | } |
1536 | ||
7e1279ea | 1537 | static void |
86bf665e | 1538 | query_srcfile_line (const dwarf_line_t& line, void * arg) |
7e1279ea FCE |
1539 | { |
1540 | dwarf_query * q = static_cast<dwarf_query *>(arg); | |
1541 | ||
86bf665e | 1542 | Dwarf_Addr addr = line.addr(); |
4cd232e4 | 1543 | |
86bf665e | 1544 | int lineno = line.lineno(); |
847bf07f | 1545 | |
86bf665e | 1546 | for (func_info_map_t::iterator i = q->filtered_functions.begin(); |
7e1279ea FCE |
1547 | i != q->filtered_functions.end(); ++i) |
1548 | { | |
3e961ba6 | 1549 | if (q->dw.die_has_pc (i->die, addr)) |
7e1279ea | 1550 | { |
b0ee93c4 | 1551 | if (q->sess.verbose>3) |
b530b5b3 | 1552 | clog << _("function DIE lands on srcfile\n"); |
4cd232e4 | 1553 | if (q->has_statement_str) |
f5958c8f JS |
1554 | { |
1555 | Dwarf_Die scope; | |
1556 | q->dw.inner_die_containing_pc(i->die, addr, scope); | |
1557 | query_statement (i->name, i->decl_file, | |
1558 | lineno, // NB: not q->line ! | |
1559 | &scope, addr, q); | |
1560 | } | |
4cd232e4 | 1561 | else |
3e961ba6 | 1562 | query_func_info (i->entrypc, *i, q); |
7e1279ea | 1563 | } |
20e4a32c RM |
1564 | } |
1565 | ||
86bf665e | 1566 | for (inline_instance_map_t::iterator i |
897820ca GH |
1567 | = q->filtered_inlines.begin(); |
1568 | i != q->filtered_inlines.end(); ++i) | |
1569 | { | |
3e961ba6 | 1570 | if (q->dw.die_has_pc (i->die, addr)) |
7e1279ea | 1571 | { |
b0ee93c4 | 1572 | if (q->sess.verbose>3) |
b530b5b3 | 1573 | clog << _("inline instance DIE lands on srcfile\n"); |
897820ca | 1574 | if (q->has_statement_str) |
f5958c8f JS |
1575 | { |
1576 | Dwarf_Die scope; | |
1577 | q->dw.inner_die_containing_pc(i->die, addr, scope); | |
1578 | query_statement (i->name, i->decl_file, | |
1579 | q->line[0], &scope, addr, q); | |
1580 | } | |
897820ca | 1581 | else |
3e961ba6 | 1582 | query_inline_instance_info (*i, q); |
897820ca | 1583 | } |
20e4a32c | 1584 | } |
7e1279ea FCE |
1585 | } |
1586 | ||
1587 | ||
7fdd3e2c JS |
1588 | bool |
1589 | inline_instance_info::operator<(const inline_instance_info& other) const | |
1590 | { | |
1591 | if (entrypc != other.entrypc) | |
1592 | return entrypc < other.entrypc; | |
1593 | ||
1594 | if (decl_line != other.decl_line) | |
1595 | return decl_line < other.decl_line; | |
1596 | ||
1597 | int cmp = name.compare(other.name); | |
1598 | if (!cmp) | |
1599 | cmp = strcmp(decl_file, other.decl_file); | |
1600 | return cmp < 0; | |
1601 | } | |
1602 | ||
1603 | ||
4fa7b22b | 1604 | static int |
7e1279ea | 1605 | query_dwarf_inline_instance (Dwarf_Die * die, void * arg) |
4fa7b22b GH |
1606 | { |
1607 | dwarf_query * q = static_cast<dwarf_query *>(arg); | |
6b517475 | 1608 | assert (q->has_statement_str || q->has_function_str); |
4bda987e | 1609 | assert (!q->has_call && !q->has_return && !q->has_exported); |
bd2b1e68 | 1610 | |
39bcd429 | 1611 | try |
7a053d3b | 1612 | { |
b0ee93c4 | 1613 | if (q->sess.verbose>2) |
b530b5b3 | 1614 | clog << _F("selected inline instance of %s\n", q->dw.function_name.c_str()); |
7e1279ea | 1615 | |
6b517475 JS |
1616 | Dwarf_Addr entrypc; |
1617 | if (q->dw.die_entrypc (die, &entrypc)) | |
1618 | { | |
1619 | inline_instance_info inl; | |
1620 | inl.die = *die; | |
1621 | inl.name = q->dw.function_name; | |
1622 | inl.entrypc = entrypc; | |
1623 | q->dw.function_file (&inl.decl_file); | |
1624 | q->dw.function_line (&inl.decl_line); | |
1625 | ||
1626 | // make sure that this inline hasn't already | |
1627 | // been matched from a different CU | |
1628 | if (q->inline_dupes.insert(inl).second) | |
1629 | q->filtered_inlines.push_back(inl); | |
1630 | } | |
7e1279ea FCE |
1631 | return DWARF_CB_OK; |
1632 | } | |
1633 | catch (const semantic_error& e) | |
1634 | { | |
1635 | q->sess.print_error (e); | |
1636 | return DWARF_CB_ABORT; | |
1637 | } | |
1638 | } | |
bb788f9f | 1639 | |
7e1279ea | 1640 | static int |
2da9cedb | 1641 | query_dwarf_func (Dwarf_Die * func, base_query * bq) |
7e1279ea | 1642 | { |
2da9cedb | 1643 | dwarf_query * q = static_cast<dwarf_query *>(bq); |
6b517475 | 1644 | assert (q->has_statement_str || q->has_function_str); |
bb788f9f | 1645 | |
bd25380d JS |
1646 | // weed out functions whose decl_file isn't one of |
1647 | // the source files that we actually care about | |
6b517475 | 1648 | if (q->spec_type != function_alone && |
bd25380d | 1649 | q->filtered_srcfiles.count(dwarf_decl_file(func)?:"") == 0) |
8096dd7d | 1650 | return DWARF_CB_OK; |
bd25380d | 1651 | |
7e1279ea FCE |
1652 | try |
1653 | { | |
7e1279ea FCE |
1654 | q->dw.focus_on_function (func); |
1655 | ||
7d6d0afc JS |
1656 | if (!q->dw.function_scope_matches(q->scopes)) |
1657 | return DWARF_CB_OK; | |
1658 | ||
857bdfd1 JS |
1659 | // make sure that this function address hasn't |
1660 | // already been matched under an aliased name | |
1661 | Dwarf_Addr addr; | |
1662 | if (!q->dw.func_is_inline() && | |
1663 | dwarf_entrypc(func, &addr) == 0 && | |
1664 | !q->alias_dupes.insert(addr).second) | |
1665 | return DWARF_CB_OK; | |
1666 | ||
4bda987e | 1667 | if (q->dw.func_is_inline () && (! q->has_call) && (! q->has_return) && (! q->has_exported)) |
7e1279ea | 1668 | { |
4bda987e | 1669 | if (q->sess.verbose>3) |
b530b5b3 | 1670 | clog << _F("checking instances of inline %s\n", q->dw.function_name.c_str()); |
4bda987e | 1671 | q->dw.iterate_over_inline_instances (query_dwarf_inline_instance, q); |
7e1279ea | 1672 | } |
8f14e444 FCE |
1673 | else if (q->dw.func_is_inline () && (q->has_return)) // PR 11553 |
1674 | { | |
1675 | q->inlined_non_returnable.insert (q->dw.function_name); | |
1676 | } | |
396afcee | 1677 | else if (!q->dw.func_is_inline () && (! q->has_inline)) |
20e4a32c | 1678 | { |
4bda987e SC |
1679 | if (q->has_exported && !q->dw.func_is_exported ()) |
1680 | return DWARF_CB_OK; | |
6b517475 | 1681 | if (q->sess.verbose>2) |
b530b5b3 | 1682 | clog << _F("selected function %s\n", q->dw.function_name.c_str()); |
6b517475 JS |
1683 | |
1684 | func_info func; | |
1685 | q->dw.function_die (&func.die); | |
1686 | func.name = q->dw.function_name; | |
1687 | q->dw.function_file (&func.decl_file); | |
1688 | q->dw.function_line (&func.decl_line); | |
1689 | ||
1690 | Dwarf_Addr entrypc; | |
1691 | if (q->dw.function_entrypc (&entrypc)) | |
1692 | { | |
1693 | func.entrypc = entrypc; | |
1694 | q->filtered_functions.push_back (func); | |
1695 | } | |
1696 | /* else this function is fully inlined, just ignore it */ | |
7e1279ea | 1697 | } |
39bcd429 | 1698 | return DWARF_CB_OK; |
bd2b1e68 | 1699 | } |
39bcd429 | 1700 | catch (const semantic_error& e) |
bd2b1e68 | 1701 | { |
39bcd429 FCE |
1702 | q->sess.print_error (e); |
1703 | return DWARF_CB_ABORT; | |
bd2b1e68 | 1704 | } |
bd2b1e68 GH |
1705 | } |
1706 | ||
1707 | static int | |
1708 | query_cu (Dwarf_Die * cudie, void * arg) | |
1709 | { | |
20c6c071 | 1710 | dwarf_query * q = static_cast<dwarf_query *>(arg); |
6b517475 JS |
1711 | assert (q->has_statement_str || q->has_function_str); |
1712 | ||
85007c04 | 1713 | if (pending_interrupts) return DWARF_CB_ABORT; |
7a053d3b | 1714 | |
39bcd429 | 1715 | try |
bd2b1e68 | 1716 | { |
7e1279ea | 1717 | q->dw.focus_on_cu (cudie); |
b5d77020 | 1718 | |
b0ee93c4 | 1719 | if (false && q->sess.verbose>2) |
b530b5b3 LB |
1720 | clog << _F("focused on CU '%s', in module '%s'\n", |
1721 | q->dw.cu_name().c_str(), q->dw.module_name.c_str()); | |
d9b516ca | 1722 | |
6b517475 JS |
1723 | q->filtered_srcfiles.clear(); |
1724 | q->filtered_functions.clear(); | |
1725 | q->filtered_inlines.clear(); | |
1726 | ||
1727 | // In this path, we find "abstract functions", record | |
1728 | // information about them, and then (depending on lineno | |
1729 | // matching) possibly emit one or more of the function's | |
1730 | // associated addresses. Unfortunately the control of this | |
1731 | // cannot easily be turned inside out. | |
1732 | ||
1733 | if (q->spec_type != function_alone) | |
39bcd429 | 1734 | { |
6b517475 JS |
1735 | // If we have a pattern string with a filename, we need |
1736 | // to elaborate the srcfile mask in question first. | |
1737 | q->dw.collect_srcfiles_matching (q->file, q->filtered_srcfiles); | |
1738 | ||
1739 | // If we have a file pattern and *no* srcfile matches, there's | |
1740 | // no need to look further into this CU, so skip. | |
1741 | if (q->filtered_srcfiles.empty()) | |
1742 | return DWARF_CB_OK; | |
1743 | } | |
e4c58386 | 1744 | |
6b517475 JS |
1745 | // Pick up [entrypc, name, DIE] tuples for all the functions |
1746 | // matching the query, and fill in the prologue endings of them | |
1747 | // all in a single pass. | |
5898b6e1 | 1748 | int rc = q->dw.iterate_over_functions (query_dwarf_func, q, q->function); |
6b517475 JS |
1749 | if (rc != DWARF_CB_OK) |
1750 | q->query_done = true; | |
1751 | ||
1752 | if ((q->sess.prologue_searching || q->has_process) // PR 6871 | |
1753 | && !q->has_statement_str) // PR 2608 | |
1754 | if (! q->filtered_functions.empty()) | |
1755 | q->dw.resolve_prologue_endings (q->filtered_functions); | |
464379bb FCE |
1756 | // NB: we could skip the resolve_prologue_endings() call here for has_return case (PR13200), |
1757 | // but don't have to. We can resolve the prologue, just not actually use it in query_addr(). | |
6b517475 JS |
1758 | |
1759 | if (q->spec_type == function_file_and_line) | |
1760 | { | |
58b070fb | 1761 | // .statement(...:NN) often gets mixed up with .function(...:NN) |
2713ea24 | 1762 | if (q->has_function_str) |
b530b5b3 LB |
1763 | q->sess.print_warning (_("For probing a particular line, use a " |
1764 | ".statement() probe, not .function()"), | |
af2e341f | 1765 | q->base_probe->tok); |
58b070fb | 1766 | |
6b517475 JS |
1767 | // If we have a pattern string with target *line*, we |
1768 | // have to look at lines in all the matched srcfiles. | |
1769 | void (* callback) (const dwarf_line_t&, void*) = | |
1770 | q->has_label ? query_srcfile_label : query_srcfile_line; | |
1771 | for (set<string>::const_iterator i = q->filtered_srcfiles.begin(); | |
1772 | i != q->filtered_srcfiles.end(); ++i) | |
1773 | q->dw.iterate_over_srcfile_lines (i->c_str(), q->line, q->has_statement_str, | |
1774 | q->line_type, callback, q->function, q); | |
1775 | } | |
1776 | else if (q->has_label) | |
1777 | { | |
1778 | for (func_info_map_t::iterator i = q->filtered_functions.begin(); | |
1779 | i != q->filtered_functions.end(); ++i) | |
1780 | q->dw.iterate_over_labels (&i->die, q->label_val, i->name, | |
1781 | q, query_label); | |
1782 | ||
1783 | for (inline_instance_map_t::iterator i = q->filtered_inlines.begin(); | |
1784 | i != q->filtered_inlines.end(); ++i) | |
1785 | q->dw.iterate_over_labels (&i->die, q->label_val, i->name, | |
1786 | q, query_label); | |
39bcd429 | 1787 | } |
6b517475 JS |
1788 | else |
1789 | { | |
1790 | // Otherwise, simply probe all resolved functions. | |
1791 | for (func_info_map_t::iterator i = q->filtered_functions.begin(); | |
1792 | i != q->filtered_functions.end(); ++i) | |
1793 | query_func_info (i->entrypc, *i, q); | |
1794 | ||
1795 | // And all inline instances (if we're not excluding inlines with ".call") | |
1796 | if (! q->has_call) | |
1797 | for (inline_instance_map_t::iterator i | |
1798 | = q->filtered_inlines.begin(); i != q->filtered_inlines.end(); ++i) | |
1799 | query_inline_instance_info (*i, q); | |
1800 | } | |
39bcd429 | 1801 | return DWARF_CB_OK; |
bd2b1e68 | 1802 | } |
39bcd429 | 1803 | catch (const semantic_error& e) |
bd2b1e68 | 1804 | { |
39bcd429 FCE |
1805 | q->sess.print_error (e); |
1806 | return DWARF_CB_ABORT; | |
bd2b1e68 | 1807 | } |
bd2b1e68 GH |
1808 | } |
1809 | ||
0ce64fb8 | 1810 | |
4df79aaf JS |
1811 | void |
1812 | dwarf_query::query_module_functions () | |
1813 | { | |
1814 | try | |
1815 | { | |
1816 | filtered_srcfiles.clear(); | |
1817 | filtered_functions.clear(); | |
1818 | filtered_inlines.clear(); | |
1819 | ||
1820 | // Collect all module functions so we know which CUs are interesting | |
1821 | int rc = dw.iterate_single_function(query_dwarf_func, this, function); | |
1822 | if (rc != DWARF_CB_OK) | |
1823 | { | |
1824 | query_done = true; | |
1825 | return; | |
1826 | } | |
1827 | ||
1828 | set<void*> used_cus; // by cu->addr | |
1829 | vector<Dwarf_Die> cus; | |
1830 | Dwarf_Die cu_mem; | |
1831 | ||
1832 | for (func_info_map_t::iterator i = filtered_functions.begin(); | |
1833 | i != filtered_functions.end(); ++i) | |
1834 | if (dwarf_diecu(&i->die, &cu_mem, NULL, NULL) && | |
1835 | used_cus.insert(cu_mem.addr).second) | |
1836 | cus.push_back(cu_mem); | |
1837 | ||
1838 | for (inline_instance_map_t::iterator i = filtered_inlines.begin(); | |
1839 | i != filtered_inlines.end(); ++i) | |
1840 | if (dwarf_diecu(&i->die, &cu_mem, NULL, NULL) && | |
1841 | used_cus.insert(cu_mem.addr).second) | |
1842 | cus.push_back(cu_mem); | |
1843 | ||
1844 | // Reset the dupes since we didn't actually collect them the first time | |
1845 | alias_dupes.clear(); | |
1846 | inline_dupes.clear(); | |
1847 | ||
1848 | // Run the query again on the individual CUs | |
1849 | for (vector<Dwarf_Die>::iterator i = cus.begin(); i != cus.end(); ++i) | |
1850 | query_cu(&*i, this); | |
1851 | } | |
1852 | catch (const semantic_error& e) | |
1853 | { | |
1854 | sess.print_error (e); | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | ||
5f0a03a6 JK |
1859 | static void |
1860 | validate_module_elf (Dwfl_Module *mod, const char *name, base_query *q) | |
1861 | { | |
1862 | // Validate the machine code in this elf file against the | |
1863 | // session machine. This is important, in case the wrong kind | |
1864 | // of debuginfo is being automagically processed by elfutils. | |
1865 | // While we can tell i686 apart from x86-64, unfortunately | |
1866 | // we can't help confusing i586 vs i686 (both EM_386). | |
1867 | ||
1868 | Dwarf_Addr bias; | |
1869 | // We prefer dwfl_module_getdwarf to dwfl_module_getelf here, | |
1870 | // because dwfl_module_getelf can force costly section relocations | |
1871 | // we don't really need, while either will do for this purpose. | |
1872 | Elf* elf = (dwarf_getelf (dwfl_module_getdwarf (mod, &bias)) | |
1873 | ?: dwfl_module_getelf (mod, &bias)); | |
1874 | ||
1875 | GElf_Ehdr ehdr_mem; | |
1876 | GElf_Ehdr* em = gelf_getehdr (elf, &ehdr_mem); | |
86bf665e | 1877 | if (em == 0) { dwfl_assert ("dwfl_getehdr", dwfl_errno()); } |
5f0a03a6 JK |
1878 | int elf_machine = em->e_machine; |
1879 | const char* debug_filename = ""; | |
1880 | const char* main_filename = ""; | |
1881 | (void) dwfl_module_info (mod, NULL, NULL, | |
1882 | NULL, NULL, NULL, | |
1883 | & main_filename, | |
1884 | & debug_filename); | |
1885 | const string& sess_machine = q->sess.architecture; | |
756c9462 FCE |
1886 | |
1887 | string expect_machine; // to match sess.machine (i.e., kernel machine) | |
1888 | string expect_machine2; | |
5f0a03a6 | 1889 | |
d27e6fd5 | 1890 | // NB: See also the 'uname -m' squashing done in main.cxx. |
5f0a03a6 JK |
1891 | switch (elf_machine) |
1892 | { | |
756c9462 FCE |
1893 | // x86 and ppc are bi-architecture; a 64-bit kernel |
1894 | // can normally run either 32-bit or 64-bit *userspace*. | |
1895 | case EM_386: | |
1896 | expect_machine = "i?86"; | |
1897 | if (! q->has_process) break; // 32-bit kernel/module | |
1898 | /* FALLSTHROUGH */ | |
1899 | case EM_X86_64: | |
1900 | expect_machine2 = "x86_64"; | |
1901 | break; | |
1902 | case EM_PPC: | |
756c9462 | 1903 | case EM_PPC64: |
5a1c472e | 1904 | expect_machine = "powerpc"; |
756c9462 | 1905 | break; |
3fe7d888 | 1906 | case EM_S390: expect_machine = "s390"; break; |
5f0a03a6 | 1907 | case EM_IA_64: expect_machine = "ia64"; break; |
d27e6fd5 | 1908 | case EM_ARM: expect_machine = "arm*"; break; |
5f0a03a6 JK |
1909 | // XXX: fill in some more of these |
1910 | default: expect_machine = "?"; break; | |
1911 | } | |
1912 | ||
1913 | if (! debug_filename) debug_filename = main_filename; | |
1914 | if (! debug_filename) debug_filename = name; | |
1915 | ||
756c9462 FCE |
1916 | if (fnmatch (expect_machine.c_str(), sess_machine.c_str(), 0) != 0 && |
1917 | fnmatch (expect_machine2.c_str(), sess_machine.c_str(), 0) != 0) | |
5f0a03a6 JK |
1918 | { |
1919 | stringstream msg; | |
b530b5b3 LB |
1920 | msg << _F("ELF machine %s|%s (code %d) mismatch with target %s in '%s'", |
1921 | expect_machine.c_str(), expect_machine2.c_str(), elf_machine, | |
1922 | sess_machine.c_str(), debug_filename); | |
5f0a03a6 JK |
1923 | throw semantic_error(msg.str ()); |
1924 | } | |
1925 | ||
1926 | if (q->sess.verbose>2) | |
2a97f50b | 1927 | clog << _F("focused on module '%s' = [%#" PRIx64 "-%#" PRIx64 ", bias %#" PRIx64 |
b530b5b3 LB |
1928 | " file %s ELF machine %s|%s (code %d)\n", |
1929 | q->dw.module_name.c_str(), q->dw.module_start, q->dw.module_end, | |
1930 | q->dw.module_bias, debug_filename, expect_machine.c_str(), | |
1931 | expect_machine2.c_str(), elf_machine); | |
5f0a03a6 | 1932 | } |
1d3a40b6 | 1933 | |
91af0778 FCE |
1934 | |
1935 | ||
1936 | static Dwarf_Addr | |
1937 | lookup_symbol_address (Dwfl_Module *m, const char* wanted) | |
1938 | { | |
1939 | int syments = dwfl_module_getsymtab(m); | |
1940 | assert(syments); | |
1941 | for (int i = 1; i < syments; ++i) | |
1942 | { | |
1943 | GElf_Sym sym; | |
1944 | const char *name = dwfl_module_getsym(m, i, &sym, NULL); | |
1945 | if (name != NULL && strcmp(name, wanted) == 0) | |
1946 | return sym.st_value; | |
1947 | } | |
1948 | ||
1949 | return 0; | |
1950 | } | |
1951 | ||
1952 | ||
1953 | ||
bd2b1e68 | 1954 | static int |
b8da0ad1 | 1955 | query_module (Dwfl_Module *mod, |
91af0778 | 1956 | void **, |
b8da0ad1 | 1957 | const char *name, |
6f4c1275 | 1958 | Dwarf_Addr addr, |
b8da0ad1 | 1959 | void *arg) |
bd2b1e68 | 1960 | { |
91af0778 | 1961 | base_query *q = static_cast<base_query *>(arg); |
bd2b1e68 | 1962 | |
39bcd429 | 1963 | try |
e38d6504 | 1964 | { |
91af0778 FCE |
1965 | module_info* mi = q->sess.module_cache->cache[name]; |
1966 | if (mi == 0) | |
1967 | { | |
1968 | mi = q->sess.module_cache->cache[name] = new module_info(name); | |
1969 | ||
6f4c1275 FCE |
1970 | mi->mod = mod; |
1971 | mi->addr = addr; | |
91af0778 | 1972 | |
6f4c1275 FCE |
1973 | const char* debug_filename = ""; |
1974 | const char* main_filename = ""; | |
1975 | (void) dwfl_module_info (mod, NULL, NULL, | |
1976 | NULL, NULL, NULL, | |
1977 | & main_filename, | |
1978 | & debug_filename); | |
1979 | ||
1980 | if (q->sess.ignore_vmlinux && name == TOK_KERNEL) | |
91af0778 FCE |
1981 | { |
1982 | // report_kernel() in elfutils found vmlinux, but pretend it didn't. | |
1983 | // Given a non-null path, returning 1 means keep reporting modules. | |
1984 | mi->dwarf_status = info_absent; | |
1985 | } | |
6f4c1275 | 1986 | else if (debug_filename || main_filename) |
91af0778 | 1987 | { |
6f4c1275 FCE |
1988 | mi->elf_path = debug_filename ?: main_filename; |
1989 | } | |
1990 | else if (name == TOK_KERNEL) | |
1991 | { | |
1992 | mi->dwarf_status = info_absent; | |
91af0778 | 1993 | } |
91af0778 FCE |
1994 | } |
1995 | // OK, enough of that module_info caching business. | |
1996 | ||
5f0a03a6 | 1997 | q->dw.focus_on_module(mod, mi); |
d9b516ca | 1998 | |
39bcd429 FCE |
1999 | // If we have enough information in the pattern to skip a module and |
2000 | // the module does not match that information, return early. | |
b8da0ad1 | 2001 | if (!q->dw.module_name_matches(q->module_val)) |
85007c04 | 2002 | return pending_interrupts ? DWARF_CB_ABORT : DWARF_CB_OK; |
0cbbf9d1 FCE |
2003 | |
2004 | // Don't allow module("*kernel*") type expressions to match the | |
2005 | // elfutils module "kernel", which we refer to in the probe | |
2006 | // point syntax exclusively as "kernel.*". | |
2007 | if (q->dw.module_name == TOK_KERNEL && ! q->has_kernel) | |
85007c04 | 2008 | return pending_interrupts ? DWARF_CB_ABORT : DWARF_CB_OK; |
b5d77020 | 2009 | |
5f0a03a6 JK |
2010 | if (mod) |
2011 | validate_module_elf(mod, name, q); | |
2012 | else | |
91af0778 FCE |
2013 | assert(q->has_kernel); // and no vmlinux to examine |
2014 | ||
2015 | if (q->sess.verbose>2) | |
b530b5b3 | 2016 | cerr << _F("focused on module '%s'\n", q->dw.module_name.c_str()); |
91af0778 FCE |
2017 | |
2018 | ||
2019 | // Collect a few kernel addresses. XXX: these belong better | |
2020 | // to the sess.module_info["kernel"] struct. | |
2021 | if (q->dw.module_name == TOK_KERNEL) | |
c931ec8a | 2022 | { |
91af0778 FCE |
2023 | if (! q->sess.sym_kprobes_text_start) |
2024 | q->sess.sym_kprobes_text_start = lookup_symbol_address (mod, "__kprobes_text_start"); | |
2025 | if (! q->sess.sym_kprobes_text_end) | |
2026 | q->sess.sym_kprobes_text_end = lookup_symbol_address (mod, "__kprobes_text_end"); | |
2027 | if (! q->sess.sym_stext) | |
2028 | q->sess.sym_stext = lookup_symbol_address (mod, "_stext"); | |
c931ec8a FCE |
2029 | } |
2030 | ||
47e226ed SC |
2031 | // We either have a wildcard or an unresolved library |
2032 | if (q->has_library && (contains_glob_chars (q->path) | |
2033 | || q->path.find('/') == string::npos)) | |
84c84ac4 SC |
2034 | // handle .library(GLOB) |
2035 | q->dw.iterate_over_libraries (&q->query_library_callback, q); | |
576eaefe SC |
2036 | // .plt is translated to .plt.statement(N). We only want to iterate for the |
2037 | // .plt case | |
2038 | else if (q->has_plt && ! q->has_statement) | |
2039 | q->dw.iterate_over_plt (q, &q->query_plt_callback); | |
84c84ac4 SC |
2040 | else |
2041 | // search the module for matches of the probe point. | |
2042 | q->handle_query_module(); | |
bb788f9f | 2043 | |
b8da0ad1 | 2044 | // If we know that there will be no more matches, abort early. |
85007c04 | 2045 | if (q->dw.module_name_final_match(q->module_val) || pending_interrupts) |
b8da0ad1 FCE |
2046 | return DWARF_CB_ABORT; |
2047 | else | |
2048 | return DWARF_CB_OK; | |
7a053d3b | 2049 | } |
39bcd429 | 2050 | catch (const semantic_error& e) |
bd2b1e68 | 2051 | { |
39bcd429 FCE |
2052 | q->sess.print_error (e); |
2053 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2054 | } |
bd2b1e68 GH |
2055 | } |
2056 | ||
35d4ab18 | 2057 | |
84c84ac4 | 2058 | void |
5d5bd369 | 2059 | base_query::query_library_callback (void *q, const char *data) |
84c84ac4 SC |
2060 | { |
2061 | base_query *me = (base_query*)q; | |
5d5bd369 | 2062 | me->query_library (data); |
84c84ac4 SC |
2063 | } |
2064 | ||
2065 | ||
2066 | void | |
51d6bda3 SC |
2067 | query_one_library (const char *library, dwflpp & dw, |
2068 | const string user_lib, probe * base_probe, probe_point *base_loc, | |
2069 | vector<derived_probe *> & results) | |
84c84ac4 | 2070 | { |
47e226ed | 2071 | if (dw.function_name_matches_pattern(library, "*" + user_lib)) |
84c84ac4 | 2072 | { |
05fb3e0c WF |
2073 | string library_path = find_executable (library, "", dw.sess.sysenv, |
2074 | "LD_LIBRARY_PATH"); | |
84c84ac4 SC |
2075 | probe_point* specific_loc = new probe_point(*base_loc); |
2076 | specific_loc->optional = true; | |
2077 | vector<probe_point::component*> derived_comps; | |
2078 | ||
2079 | vector<probe_point::component*>::iterator it; | |
2080 | for (it = specific_loc->components.begin(); | |
2081 | it != specific_loc->components.end(); ++it) | |
2082 | if ((*it)->functor == TOK_LIBRARY) | |
2083 | derived_comps.push_back(new probe_point::component(TOK_LIBRARY, | |
2084 | new literal_string(library_path))); | |
2085 | else | |
2086 | derived_comps.push_back(*it); | |
2087 | probe_point* derived_loc = new probe_point(*specific_loc); | |
2088 | derived_loc->components = derived_comps; | |
2089 | probe *new_base = base_probe->create_alias(derived_loc, specific_loc); | |
51d6bda3 SC |
2090 | derive_probes(dw.sess, new_base, results); |
2091 | if (dw.sess.verbose > 2) | |
84c84ac4 SC |
2092 | clog << _("module=") << library_path; |
2093 | } | |
2094 | } | |
2095 | ||
2096 | ||
51d6bda3 SC |
2097 | void |
2098 | dwarf_query::query_library (const char *library) | |
2099 | { | |
2100 | query_one_library (library, dw, user_lib, base_probe, base_loc, results); | |
2101 | } | |
2102 | ||
576eaefe SC |
2103 | struct plt_expanding_visitor: public var_expanding_visitor |
2104 | { | |
2105 | plt_expanding_visitor(const string & entry): | |
2106 | entry (entry) | |
2107 | { | |
2108 | } | |
2109 | const string & entry; | |
2110 | ||
2111 | void visit_target_symbol (target_symbol* e); | |
2112 | }; | |
2113 | ||
2114 | ||
2115 | void | |
2116 | base_query::query_plt_callback (void *q, const char *entry, size_t address) | |
2117 | { | |
2118 | base_query *me = (base_query*)q; | |
2119 | if (me->dw.function_name_matches_pattern (entry, me->plt_val)) | |
2120 | me->query_plt (entry, address); | |
2121 | } | |
2122 | ||
2123 | ||
2124 | void | |
2125 | query_one_plt (const char *entry, long addr, dwflpp & dw, | |
2126 | probe * base_probe, probe_point *base_loc, | |
2127 | vector<derived_probe *> & results) | |
2128 | { | |
2129 | probe_point* specific_loc = new probe_point(*base_loc); | |
2130 | specific_loc->optional = true; | |
2131 | vector<probe_point::component*> derived_comps; | |
2132 | ||
2133 | if (dw.sess.verbose > 2) | |
2134 | clog << _F("plt entry=%s\n", entry); | |
2135 | ||
2136 | // query_module_symtab requires .plt to recognize that it can set the probe at | |
2137 | // a plt entry so we convert process.plt to process.plt.statement | |
2138 | vector<probe_point::component*>::iterator it; | |
2139 | for (it = specific_loc->components.begin(); | |
2140 | it != specific_loc->components.end(); ++it) | |
2141 | if ((*it)->functor == TOK_PLT) | |
3d372d6b SC |
2142 | { |
2143 | derived_comps.push_back(*it); | |
2144 | derived_comps.push_back(new probe_point::component(TOK_STATEMENT, | |
2145 | new literal_number(addr))); | |
2146 | } | |
576eaefe SC |
2147 | else |
2148 | derived_comps.push_back(*it); | |
2149 | probe_point* derived_loc = new probe_point(*specific_loc); | |
2150 | derived_loc->components = derived_comps; | |
2151 | probe *new_base = base_probe->create_alias(derived_loc, specific_loc); | |
2152 | string e = string(entry); | |
2153 | plt_expanding_visitor pltv (e); | |
2154 | pltv.replace (new_base->body); | |
2155 | derive_probes(dw.sess, new_base, results); | |
2156 | } | |
2157 | ||
2158 | ||
2159 | void | |
2160 | dwarf_query::query_plt (const char *entry, size_t address) | |
2161 | { | |
2162 | query_one_plt (entry, address, dw, base_probe, base_loc, results); | |
2163 | } | |
51d6bda3 | 2164 | |
435f53a7 FCE |
2165 | // This would more naturally fit into elaborate.cxx:semantic_pass_symbols, |
2166 | // but the needed declaration for module_cache is not available there. | |
2167 | // Nor for that matter in session.cxx. Only in this CU is that field ever | |
2168 | // set (in query_module() above), so we clean it up here too. | |
2169 | static void | |
2170 | delete_session_module_cache (systemtap_session& s) | |
2171 | { | |
2172 | if (s.module_cache) { | |
2173 | if (s.verbose > 3) | |
b530b5b3 | 2174 | clog << _("deleting module_cache") << endl; |
435f53a7 FCE |
2175 | delete s.module_cache; |
2176 | s.module_cache = 0; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | ||
de688825 | 2181 | struct dwarf_var_expanding_visitor: public var_expanding_visitor |
35d4ab18 | 2182 | { |
77de5e9e | 2183 | dwarf_query & q; |
bcc12710 | 2184 | Dwarf_Die *scope_die; |
77de5e9e | 2185 | Dwarf_Addr addr; |
8c819921 | 2186 | block *add_block; |
2260f4e3 | 2187 | block *add_call_probe; // synthesized from .return probes with saved $vars |
8cc799a5 | 2188 | bool add_block_tid, add_call_probe_tid; |
af234c40 JS |
2189 | unsigned saved_longs, saved_strings; // data saved within kretprobes |
2190 | map<std::string, expression *> return_ts_map; | |
729455a7 | 2191 | vector<Dwarf_Die> scopes; |
b95e2b79 | 2192 | bool visited; |
77de5e9e | 2193 | |
de688825 | 2194 | dwarf_var_expanding_visitor(dwarf_query & q, Dwarf_Die *sd, Dwarf_Addr a): |
af234c40 | 2195 | q(q), scope_die(sd), addr(a), add_block(NULL), add_call_probe(NULL), |
8cc799a5 | 2196 | add_block_tid(false), add_call_probe_tid(false), |
af234c40 | 2197 | saved_longs(0), saved_strings(0), visited(false) {} |
277c21bc | 2198 | expression* gen_mapped_saved_return(expression* e, const string& name); |
140be17a | 2199 | expression* gen_kretprobe_saved_return(expression* e); |
a7999c82 JS |
2200 | void visit_target_symbol_saved_return (target_symbol* e); |
2201 | void visit_target_symbol_context (target_symbol* e); | |
d7f3e0c5 | 2202 | void visit_target_symbol (target_symbol* e); |
c24447be | 2203 | void visit_cast_op (cast_op* e); |
8cc799a5 | 2204 | void visit_entry_op (entry_op* e); |
729455a7 | 2205 | private: |
bfa7e523 | 2206 | vector<Dwarf_Die>& getcuscope(target_symbol *e); |
729455a7 | 2207 | vector<Dwarf_Die>& getscopes(target_symbol *e); |
77de5e9e GH |
2208 | }; |
2209 | ||
2210 | ||
de688825 | 2211 | unsigned var_expanding_visitor::tick = 0; |
77de5e9e | 2212 | |
a50de939 | 2213 | |
74fe61bc | 2214 | var_expanding_visitor::var_expanding_visitor (): op() |
a50de939 DS |
2215 | { |
2216 | // FIXME: for the time being, by default we only support plain '$foo | |
2217 | // = bar', not '+=' or any other op= variant. This is fixable, but a | |
2218 | // bit ugly. | |
2219 | // | |
2220 | // If derived classes desire to add additional operator support, add | |
2221 | // new operators to this list in the derived class constructor. | |
2222 | valid_ops.insert ("="); | |
2223 | } | |
2224 | ||
2225 | ||
87214add JS |
2226 | bool |
2227 | var_expanding_visitor::rewrite_lvalue(const token* tok, const std::string& eop, | |
2228 | expression*& lvalue, expression*& rvalue) | |
77de5e9e | 2229 | { |
e57b735a GH |
2230 | // Our job would normally be to require() the left and right sides |
2231 | // into a new assignment. What we're doing is slightly trickier: | |
2232 | // we're pushing a functioncall** onto a stack, and if our left | |
2233 | // child sets the functioncall* for that value, we're going to | |
2234 | // assume our left child was a target symbol -- transformed into a | |
2235 | // set_target_foo(value) call, and it wants to take our right child | |
2236 | // as the argument "value". | |
2237 | // | |
2238 | // This is why some people claim that languages with | |
2239 | // constructor-decomposing case expressions have a leg up on | |
2240 | // visitors. | |
2241 | ||
2242 | functioncall *fcall = NULL; | |
d9b516ca | 2243 | |
a50de939 | 2244 | // Let visit_target_symbol know what operator it should handle. |
87214add JS |
2245 | const string* old_op = op; |
2246 | op = &eop; | |
a50de939 | 2247 | |
e57b735a | 2248 | target_symbol_setter_functioncalls.push (&fcall); |
87214add | 2249 | replace (lvalue); |
e57b735a | 2250 | target_symbol_setter_functioncalls.pop (); |
87214add JS |
2251 | replace (rvalue); |
2252 | ||
2253 | op = old_op; | |
e57b735a GH |
2254 | |
2255 | if (fcall != NULL) | |
77de5e9e | 2256 | { |
e57b735a GH |
2257 | // Our left child is informing us that it was a target variable |
2258 | // and it has been replaced with a set_target_foo() function | |
2259 | // call; we are going to provide that function call -- with the | |
2260 | // right child spliced in as sole argument -- in place of | |
de688825 | 2261 | // ourselves, in the var expansion we're in the middle of making. |
e57b735a | 2262 | |
87214add | 2263 | if (valid_ops.find (eop) == valid_ops.end ()) |
a50de939 DS |
2264 | { |
2265 | // Build up a list of supported operators. | |
2266 | string ops; | |
2267 | std::set<string>::iterator i; | |
b530b5b3 | 2268 | int valid_ops_size = 0; |
a50de939 | 2269 | for (i = valid_ops.begin(); i != valid_ops.end(); i++) |
b530b5b3 | 2270 | { |
a50de939 | 2271 | ops += " " + *i + ","; |
b530b5b3 LB |
2272 | valid_ops_size++; |
2273 | } | |
a50de939 DS |
2274 | ops.resize(ops.size() - 1); // chop off the last ',' |
2275 | ||
2276 | // Throw the error. | |
1e41115c LB |
2277 | throw semantic_error (_F(ngettext("Only the following assign operator is implemented on target variables: %s", |
2278 | "Only the following assign operators are implemented on target variables: %s", | |
b530b5b3 LB |
2279 | valid_ops_size), ops.c_str()), tok); |
2280 | ||
a50de939 | 2281 | } |
e57b735a | 2282 | |
87214add JS |
2283 | assert (lvalue == fcall); |
2284 | if (rvalue) | |
2285 | fcall->args.push_back (rvalue); | |
4ed05b15 | 2286 | provide (fcall); |
87214add | 2287 | return true; |
77de5e9e | 2288 | } |
e57b735a | 2289 | else |
87214add JS |
2290 | return false; |
2291 | } | |
2292 | ||
2293 | ||
2294 | void | |
2295 | var_expanding_visitor::visit_assignment (assignment* e) | |
2296 | { | |
2297 | if (!rewrite_lvalue (e->tok, e->op, e->left, e->right)) | |
2298 | provide (e); | |
2299 | } | |
2300 | ||
2301 | ||
2302 | void | |
2303 | var_expanding_visitor::visit_pre_crement (pre_crement* e) | |
2304 | { | |
2305 | expression *dummy = NULL; | |
2306 | if (!rewrite_lvalue (e->tok, e->op, e->operand, dummy)) | |
2307 | provide (e); | |
2308 | } | |
2309 | ||
2310 | ||
2311 | void | |
2312 | var_expanding_visitor::visit_post_crement (post_crement* e) | |
2313 | { | |
2314 | expression *dummy = NULL; | |
2315 | if (!rewrite_lvalue (e->tok, e->op, e->operand, dummy)) | |
2316 | provide (e); | |
2317 | } | |
2318 | ||
2319 | ||
2320 | void | |
2321 | var_expanding_visitor::visit_delete_statement (delete_statement* s) | |
2322 | { | |
2323 | string fakeop = "delete"; | |
2324 | expression *dummy = NULL; | |
2325 | if (!rewrite_lvalue (s->tok, fakeop, s->value, dummy)) | |
2326 | provide (s); | |
e57b735a | 2327 | } |
d9b516ca | 2328 | |
d7f3e0c5 | 2329 | |
30263a73 FCE |
2330 | void |
2331 | var_expanding_visitor::visit_defined_op (defined_op* e) | |
2332 | { | |
2333 | bool resolved = true; | |
2334 | ||
2335 | defined_ops.push (e); | |
2336 | try { | |
2337 | // NB: provide<>/require<> are NOT typesafe. So even though a defined_op is | |
2338 | // defined with a target_symbol* operand, a subsidiary call may attempt to | |
2339 | // rewrite it to a general expression* instead, and require<> happily | |
2340 | // casts to/from void*, causing possible memory corruption. We use | |
2341 | // expression* here, being the general case of rewritten $variable. | |
2342 | expression *foo1 = e->operand; | |
2343 | foo1 = require (foo1); | |
2344 | ||
c69a87e0 | 2345 | // NB: Formerly, we had some curious cases to consider here, depending on what |
30263a73 | 2346 | // various visit_target_symbol() implementations do for successful or |
c69a87e0 FCE |
2347 | // erroneous resolutions. Some would signal a visit_target_symbol failure |
2348 | // with an exception, with a set flag within the target_symbol, or nothing | |
2349 | // at all. | |
30263a73 | 2350 | // |
c69a87e0 FCE |
2351 | // Now, failures always have to be signalled with a |
2352 | // saved_conversion_error being chained to the target_symbol. | |
2353 | // Successes have to result in an attempted rewrite of the | |
850bfddd | 2354 | // target_symbol (via provide()). |
780f11ff | 2355 | // |
c69a87e0 FCE |
2356 | // Edna Mode: "no capes". fche: "no exceptions". |
2357 | ||
30263a73 FCE |
2358 | // dwarf stuff: success: rewrites to a function; failure: retains target_symbol, sets saved_conversion_error |
2359 | // | |
2360 | // sdt-kprobes sdt.h: success: string or functioncall; failure: semantic_error | |
2361 | // | |
2362 | // sdt-uprobes: success: string or no op; failure: no op; expect derived/synthetic | |
2363 | // dwarf probe to take care of it. | |
2364 | // But this is rather unhelpful. So we rig the sdt_var_expanding_visitor | |
2365 | // to pass through @defined() to the synthetic dwarf probe. | |
780f11ff | 2366 | // |
30263a73 FCE |
2367 | // utrace: success: rewrites to function; failure: semantic_error |
2368 | // | |
850bfddd | 2369 | // procfs: success: rewrites to function; failure: semantic_error |
30263a73 FCE |
2370 | |
2371 | target_symbol* foo2 = dynamic_cast<target_symbol*> (foo1); | |
c69a87e0 | 2372 | if (foo2 && foo2->saved_conversion_error) // failing |
30263a73 | 2373 | resolved = false; |
a45664f4 | 2374 | else if (foo2) // unresolved but not marked failing |
b7aedf26 | 2375 | { |
780f11ff JS |
2376 | // There are some visitors that won't touch certain target_symbols, |
2377 | // e.g. dwarf_var_expanding_visitor won't resolve @cast. We should | |
2378 | // leave it for now so some other visitor can have a chance. | |
b7aedf26 JS |
2379 | e->operand = foo2; |
2380 | provide (e); | |
2381 | return; | |
2382 | } | |
30263a73 FCE |
2383 | else // resolved, rewritten to some other expression type |
2384 | resolved = true; | |
780f11ff | 2385 | } catch (const semantic_error& e) { |
c69a87e0 | 2386 | assert (0); // should not happen |
30263a73 FCE |
2387 | } |
2388 | defined_ops.pop (); | |
2389 | ||
2390 | literal_number* ln = new literal_number (resolved ? 1 : 0); | |
2391 | ln->tok = e->tok; | |
2392 | provide (ln); | |
2393 | } | |
2394 | ||
2395 | ||
5f36109e JS |
2396 | struct dwarf_pretty_print |
2397 | { | |
2398 | dwarf_pretty_print (dwflpp& dw, vector<Dwarf_Die>& scopes, Dwarf_Addr pc, | |
2399 | const string& local, bool userspace_p, | |
2400 | const target_symbol& e): | |
d19a9a82 JS |
2401 | dw(dw), local(local), scopes(scopes), pc(pc), pointer(NULL), |
2402 | userspace_p(userspace_p), deref_p(true) | |
5f36109e JS |
2403 | { |
2404 | init_ts (e); | |
2405 | dw.type_die_for_local (scopes, pc, local, ts, &base_type); | |
2406 | } | |
2407 | ||
2408 | dwarf_pretty_print (dwflpp& dw, Dwarf_Die *scope_die, Dwarf_Addr pc, | |
2409 | bool userspace_p, const target_symbol& e): | |
d19a9a82 JS |
2410 | dw(dw), scopes(1, *scope_die), pc(pc), pointer(NULL), |
2411 | userspace_p(userspace_p), deref_p(true) | |
5f36109e JS |
2412 | { |
2413 | init_ts (e); | |
2414 | dw.type_die_for_return (&scopes[0], pc, ts, &base_type); | |
2415 | } | |
2416 | ||
2417 | dwarf_pretty_print (dwflpp& dw, Dwarf_Die *type_die, expression* pointer, | |
d19a9a82 | 2418 | bool deref_p, bool userspace_p, const target_symbol& e): |
5f36109e | 2419 | dw(dw), pc(0), pointer(pointer), pointer_type(*type_die), |
d19a9a82 | 2420 | userspace_p(userspace_p), deref_p(deref_p) |
5f36109e JS |
2421 | { |
2422 | init_ts (e); | |
2423 | dw.type_die_for_pointer (type_die, ts, &base_type); | |
2424 | } | |
2425 | ||
2426 | functioncall* expand (); | |
ce83ff57 | 2427 | ~dwarf_pretty_print () { delete ts; } |
5f36109e JS |
2428 | |
2429 | private: | |
2430 | dwflpp& dw; | |
2431 | target_symbol* ts; | |
7d11d8c9 | 2432 | bool print_full; |
5f36109e JS |
2433 | Dwarf_Die base_type; |
2434 | ||
2435 | string local; | |
2436 | vector<Dwarf_Die> scopes; | |
2437 | Dwarf_Addr pc; | |
2438 | ||
2439 | expression* pointer; | |
2440 | Dwarf_Die pointer_type; | |
2441 | ||
d19a9a82 | 2442 | const bool userspace_p, deref_p; |
5f36109e JS |
2443 | |
2444 | void recurse (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2445 | print_format* pf, bool top=false); |
5f36109e | 2446 | void recurse_base (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2447 | print_format* pf); |
5f36109e | 2448 | void recurse_array (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2449 | print_format* pf, bool top); |
5f36109e | 2450 | void recurse_pointer (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2451 | print_format* pf, bool top); |
5f36109e | 2452 | void recurse_struct (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2453 | print_format* pf, bool top); |
5f36109e | 2454 | void recurse_struct_members (Dwarf_Die* type, target_symbol* e, |
7d11d8c9 | 2455 | print_format* pf, int& count); |
bbee5bb8 | 2456 | bool print_chars (Dwarf_Die* type, target_symbol* e, print_format* pf); |
5f36109e JS |
2457 | |
2458 | void init_ts (const target_symbol& e); | |
2459 | expression* deref (target_symbol* e); | |
c55ea10d | 2460 | bool push_deref (print_format* pf, const string& fmt, target_symbol* e); |
5f36109e JS |
2461 | }; |
2462 | ||
2463 | ||
2464 | void | |
2465 | dwarf_pretty_print::init_ts (const target_symbol& e) | |
2466 | { | |
2467 | // Work with a new target_symbol so we can modify arguments | |
2468 | ts = new target_symbol (e); | |
2469 | ||
2470 | if (ts->addressof) | |
b530b5b3 | 2471 | throw semantic_error(_("cannot take address of pretty-printed variable"), ts->tok); |
5f36109e JS |
2472 | |
2473 | if (ts->components.empty() || | |
2474 | ts->components.back().type != target_symbol::comp_pretty_print) | |
b530b5b3 | 2475 | throw semantic_error(_("invalid target_symbol for pretty-print"), ts->tok); |
7d11d8c9 | 2476 | print_full = ts->components.back().member.length() > 1; |
5f36109e JS |
2477 | ts->components.pop_back(); |
2478 | } | |
2479 | ||
2480 | ||
2481 | functioncall* | |
2482 | dwarf_pretty_print::expand () | |
2483 | { | |
2484 | static unsigned tick = 0; | |
2485 | ||
2486 | // function pretty_print_X([pointer], [arg1, arg2, ...]) { | |
7d11d8c9 JS |
2487 | // try { |
2488 | // return sprintf("{.foo=...}", (ts)->foo, ...) | |
2489 | // } catch { | |
2490 | // return "ERROR" | |
2491 | // } | |
5f36109e JS |
2492 | // } |
2493 | ||
2494 | // Create the function decl and call. | |
2495 | ||
2496 | functiondecl *fdecl = new functiondecl; | |
2497 | fdecl->tok = ts->tok; | |
2498 | fdecl->synthetic = true; | |
2499 | fdecl->name = "_dwarf_pretty_print_" + lex_cast(tick++); | |
2500 | fdecl->type = pe_string; | |
2501 | ||
2502 | functioncall* fcall = new functioncall; | |
2503 | fcall->tok = ts->tok; | |
2504 | fcall->function = fdecl->name; | |
140be17a | 2505 | fcall->type = pe_string; |
5f36109e JS |
2506 | |
2507 | // If there's a <pointer>, replace it with a new var and make that | |
2508 | // the first function argument. | |
2509 | if (pointer) | |
2510 | { | |
2511 | vardecl *v = new vardecl; | |
2512 | v->type = pe_long; | |
2513 | v->name = "pointer"; | |
2514 | v->tok = ts->tok; | |
2515 | fdecl->formal_args.push_back (v); | |
2516 | fcall->args.push_back (pointer); | |
2517 | ||
2518 | symbol* sym = new symbol; | |
2519 | sym->tok = ts->tok; | |
2520 | sym->name = v->name; | |
5f36109e JS |
2521 | pointer = sym; |
2522 | } | |
2523 | ||
2524 | // For each expression argument, replace it with a function argument. | |
2525 | for (unsigned i = 0; i < ts->components.size(); ++i) | |
2526 | if (ts->components[i].type == target_symbol::comp_expression_array_index) | |
2527 | { | |
2528 | vardecl *v = new vardecl; | |
2529 | v->type = pe_long; | |
2530 | v->name = "index" + lex_cast(i); | |
2531 | v->tok = ts->tok; | |
2532 | fdecl->formal_args.push_back (v); | |
2533 | fcall->args.push_back (ts->components[i].expr_index); | |
2534 | ||
2535 | symbol* sym = new symbol; | |
2536 | sym->tok = ts->tok; | |
2537 | sym->name = v->name; | |
5f36109e JS |
2538 | ts->components[i].expr_index = sym; |
2539 | } | |
2540 | ||
2541 | // Create the return sprintf. | |
2542 | token* pf_tok = new token(*ts->tok); | |
2543 | pf_tok->content = "sprintf"; | |
2544 | print_format* pf = print_format::create(pf_tok); | |
2545 | return_statement* rs = new return_statement; | |
2546 | rs->tok = ts->tok; | |
2547 | rs->value = pf; | |
5f36109e JS |
2548 | |
2549 | // Recurse into the actual values. | |
7d11d8c9 | 2550 | recurse (&base_type, ts, pf, true); |
5f36109e JS |
2551 | pf->components = print_format::string_to_components(pf->raw_components); |
2552 | ||
7d11d8c9 JS |
2553 | // Create the try-catch net |
2554 | try_block* tb = new try_block; | |
2555 | tb->tok = ts->tok; | |
2556 | tb->try_block = rs; | |
2557 | tb->catch_error_var = 0; | |
2558 | return_statement* rs2 = new return_statement; | |
2559 | rs2->tok = ts->tok; | |
2560 | rs2->value = new literal_string ("ERROR"); | |
2561 | rs2->value->tok = ts->tok; | |
2562 | tb->catch_block = rs2; | |
2563 | fdecl->body = tb; | |
2564 | ||
f8809d54 | 2565 | fdecl->join (dw.sess); |
5f36109e JS |
2566 | return fcall; |
2567 | } | |
2568 | ||
2569 | ||
2570 | void | |
2571 | dwarf_pretty_print::recurse (Dwarf_Die* start_type, target_symbol* e, | |
7d11d8c9 | 2572 | print_format* pf, bool top) |
5f36109e JS |
2573 | { |
2574 | Dwarf_Die type; | |
2575 | dw.resolve_unqualified_inner_typedie (start_type, &type, e); | |
2576 | ||
2577 | switch (dwarf_tag(&type)) | |
2578 | { | |
2579 | default: | |
2580 | // XXX need a warning? | |
2581 | // throw semantic_error ("unsupported type (tag " + lex_cast(dwarf_tag(&type)) | |
2582 | // + ") for " + dwarf_type_name(&type), e->tok); | |
2583 | pf->raw_components.append("?"); | |
2584 | break; | |
2585 | ||
2586 | case DW_TAG_enumeration_type: | |
2587 | case DW_TAG_base_type: | |
7d11d8c9 | 2588 | recurse_base (&type, e, pf); |
5f36109e JS |
2589 | break; |
2590 | ||
2591 | case DW_TAG_array_type: | |
7d11d8c9 | 2592 | recurse_array (&type, e, pf, top); |
5f36109e JS |
2593 | break; |
2594 | ||
2595 | case DW_TAG_pointer_type: | |
2596 | case DW_TAG_reference_type: | |
2597 | case DW_TAG_rvalue_reference_type: | |
7d11d8c9 | 2598 | recurse_pointer (&type, e, pf, top); |
5f36109e JS |
2599 | break; |
2600 | ||
2601 | case DW_TAG_subroutine_type: | |
c55ea10d | 2602 | push_deref (pf, "<function>:%p", e); |
5f36109e JS |
2603 | break; |
2604 | ||
2605 | case DW_TAG_union_type: | |
5f36109e JS |
2606 | case DW_TAG_structure_type: |
2607 | case DW_TAG_class_type: | |
7d11d8c9 | 2608 | recurse_struct (&type, e, pf, top); |
5f36109e JS |
2609 | break; |
2610 | } | |
2611 | } | |
2612 | ||
2613 | ||
2614 | void | |
2615 | dwarf_pretty_print::recurse_base (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2616 | print_format* pf) |
5f36109e JS |
2617 | { |
2618 | Dwarf_Attribute attr; | |
2619 | Dwarf_Word encoding = (Dwarf_Word) -1; | |
2620 | dwarf_formudata (dwarf_attr_integrate (type, DW_AT_encoding, &attr), | |
2621 | &encoding); | |
5f36109e JS |
2622 | switch (encoding) |
2623 | { | |
2624 | case DW_ATE_float: | |
2625 | case DW_ATE_complex_float: | |
2626 | // XXX need a warning? | |
2627 | // throw semantic_error ("unsupported type (encoding " + lex_cast(encoding) | |
2628 | // + ") for " + dwarf_type_name(type), e->tok); | |
2629 | pf->raw_components.append("?"); | |
5f36109e JS |
2630 | break; |
2631 | ||
2632 | case DW_ATE_signed_char: | |
2633 | case DW_ATE_unsigned_char: | |
c55ea10d | 2634 | push_deref (pf, "'%c'", e); |
5f36109e JS |
2635 | break; |
2636 | ||
2637 | case DW_ATE_unsigned: | |
c55ea10d | 2638 | push_deref (pf, "%u", e); |
5f36109e JS |
2639 | break; |
2640 | ||
2641 | default: | |
c55ea10d | 2642 | push_deref (pf, "%i", e); |
5f36109e JS |
2643 | break; |
2644 | } | |
5f36109e JS |
2645 | } |
2646 | ||
2647 | ||
2648 | void | |
2649 | dwarf_pretty_print::recurse_array (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2650 | print_format* pf, bool top) |
5f36109e | 2651 | { |
7d11d8c9 JS |
2652 | if (!top && !print_full) |
2653 | { | |
2654 | pf->raw_components.append("[...]"); | |
2655 | return; | |
2656 | } | |
2657 | ||
5f36109e JS |
2658 | Dwarf_Die childtype; |
2659 | dwarf_attr_die (type, DW_AT_type, &childtype); | |
bbee5bb8 JS |
2660 | |
2661 | if (print_chars (&childtype, e, pf)) | |
2662 | return; | |
2663 | ||
5f36109e JS |
2664 | pf->raw_components.append("["); |
2665 | ||
2666 | // We print the array up to the first 5 elements. | |
2667 | // XXX how can we determine the array size? | |
2668 | // ... for now, just print the first element | |
64cddf39 | 2669 | // NB: limit to 32 args; see PR10750 and c_unparser::visit_print_format. |
5f36109e | 2670 | unsigned i, size = 1; |
64cddf39 | 2671 | for (i=0; i < size && i < 5 && pf->args.size() < 32; ++i) |
5f36109e JS |
2672 | { |
2673 | if (i > 0) | |
2674 | pf->raw_components.append(", "); | |
2675 | target_symbol* e2 = new target_symbol(*e); | |
2676 | e2->components.push_back (target_symbol::component(e->tok, i)); | |
7d11d8c9 | 2677 | recurse (&childtype, e2, pf); |
5f36109e JS |
2678 | } |
2679 | if (i < size || 1/*XXX until real size is known */) | |
2680 | pf->raw_components.append(", ..."); | |
2681 | pf->raw_components.append("]"); | |
2682 | } | |
2683 | ||
2684 | ||
2685 | void | |
2686 | dwarf_pretty_print::recurse_pointer (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2687 | print_format* pf, bool top) |
5f36109e | 2688 | { |
7d11d8c9 | 2689 | // We chase to top-level pointers, but leave the rest alone |
d19a9a82 | 2690 | bool void_p = true; |
7d11d8c9 | 2691 | Dwarf_Die pointee; |
bbee5bb8 | 2692 | if (dwarf_attr_die (type, DW_AT_type, &pointee)) |
d19a9a82 JS |
2693 | { |
2694 | try | |
2695 | { | |
2696 | dw.resolve_unqualified_inner_typedie (&pointee, &pointee, e); | |
2697 | void_p = false; | |
2698 | } | |
2699 | catch (const semantic_error&) {} | |
2700 | } | |
2701 | ||
2702 | if (!void_p) | |
5f36109e | 2703 | { |
bbee5bb8 JS |
2704 | if (print_chars (&pointee, e, pf)) |
2705 | return; | |
2706 | ||
2707 | if (top) | |
2708 | { | |
2709 | recurse (&pointee, e, pf, top); | |
2710 | return; | |
2711 | } | |
5f36109e | 2712 | } |
bbee5bb8 | 2713 | |
c55ea10d | 2714 | push_deref (pf, "%p", e); |
5f36109e JS |
2715 | } |
2716 | ||
2717 | ||
2718 | void | |
2719 | dwarf_pretty_print::recurse_struct (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2720 | print_format* pf, bool top) |
5f36109e | 2721 | { |
bdec0e18 JS |
2722 | if (dwarf_hasattr(type, DW_AT_declaration)) |
2723 | { | |
a44a7cb5 | 2724 | Dwarf_Die *resolved = dw.declaration_resolve(type); |
bdec0e18 JS |
2725 | if (!resolved) |
2726 | { | |
2727 | // could be an error, but for now just stub it | |
2728 | // throw semantic_error ("unresolved " + dwarf_type_name(type), e->tok); | |
2729 | pf->raw_components.append("{...}"); | |
2730 | return; | |
2731 | } | |
2732 | type = resolved; | |
2733 | } | |
2734 | ||
5f36109e JS |
2735 | int count = 0; |
2736 | pf->raw_components.append("{"); | |
7d11d8c9 JS |
2737 | if (top || print_full) |
2738 | recurse_struct_members (type, e, pf, count); | |
2739 | else | |
2740 | pf->raw_components.append("..."); | |
5f36109e JS |
2741 | pf->raw_components.append("}"); |
2742 | } | |
2743 | ||
2744 | ||
2745 | void | |
2746 | dwarf_pretty_print::recurse_struct_members (Dwarf_Die* type, target_symbol* e, | |
7d11d8c9 | 2747 | print_format* pf, int& count) |
5f36109e | 2748 | { |
a80f28d8 JS |
2749 | /* With inheritance, a subclass may mask member names of parent classes, so |
2750 | * our search among the inheritance tree must be breadth-first rather than | |
2751 | * depth-first (recursive). The type die is still our starting point. When | |
2752 | * we encounter a masked name, just skip it. */ | |
2753 | set<string> dupes; | |
2754 | deque<Dwarf_Die> inheritees(1, *type); | |
2755 | for (; !inheritees.empty(); inheritees.pop_front()) | |
2756 | { | |
2757 | Dwarf_Die child, childtype; | |
2758 | if (dwarf_child (&inheritees.front(), &child) == 0) | |
2759 | do | |
2760 | { | |
2761 | target_symbol* e2 = e; | |
5f36109e | 2762 | |
a80f28d8 JS |
2763 | // skip static members |
2764 | if (dwarf_hasattr(&child, DW_AT_declaration)) | |
2765 | continue; | |
5f36109e | 2766 | |
a80f28d8 | 2767 | int tag = dwarf_tag (&child); |
5f36109e | 2768 | |
a80f28d8 JS |
2769 | if (tag != DW_TAG_member && tag != DW_TAG_inheritance) |
2770 | continue; | |
5f36109e | 2771 | |
a80f28d8 | 2772 | dwarf_attr_die (&child, DW_AT_type, &childtype); |
5f36109e | 2773 | |
a80f28d8 JS |
2774 | if (tag == DW_TAG_inheritance) |
2775 | { | |
2776 | inheritees.push_back(childtype); | |
2777 | continue; | |
2778 | } | |
5f36109e | 2779 | |
a80f28d8 JS |
2780 | int childtag = dwarf_tag (&childtype); |
2781 | const char *member = dwarf_diename (&child); | |
3a147004 | 2782 | |
a80f28d8 JS |
2783 | // "_vptr.foo" members are C++ virtual function tables, |
2784 | // which (generally?) aren't interesting for users. | |
2785 | if (member && startswith(member, "_vptr.")) | |
2786 | continue; | |
3a147004 | 2787 | |
a80f28d8 JS |
2788 | // skip inheritance-masked duplicates |
2789 | if (member && !dupes.insert(member).second) | |
2790 | continue; | |
64cddf39 | 2791 | |
a80f28d8 JS |
2792 | if (++count > 1) |
2793 | pf->raw_components.append(", "); | |
64cddf39 | 2794 | |
a80f28d8 JS |
2795 | // NB: limit to 32 args; see PR10750 and c_unparser::visit_print_format. |
2796 | if (pf->args.size() >= 32) | |
2797 | { | |
2798 | pf->raw_components.append("..."); | |
2799 | break; | |
2800 | } | |
2801 | ||
2802 | if (member) | |
2803 | { | |
2804 | pf->raw_components.append("."); | |
2805 | pf->raw_components.append(member); | |
5f36109e | 2806 | |
a80f28d8 JS |
2807 | e2 = new target_symbol(*e); |
2808 | e2->components.push_back (target_symbol::component(e->tok, member)); | |
2809 | } | |
2810 | else if (childtag == DW_TAG_union_type) | |
2811 | pf->raw_components.append("<union>"); | |
2812 | else if (childtag == DW_TAG_structure_type) | |
2813 | pf->raw_components.append("<class>"); | |
2814 | else if (childtag == DW_TAG_class_type) | |
2815 | pf->raw_components.append("<struct>"); | |
2816 | pf->raw_components.append("="); | |
2817 | recurse (&childtype, e2, pf); | |
5f36109e | 2818 | } |
a80f28d8 JS |
2819 | while (dwarf_siblingof (&child, &child) == 0); |
2820 | } | |
5f36109e JS |
2821 | } |
2822 | ||
2823 | ||
bbee5bb8 JS |
2824 | bool |
2825 | dwarf_pretty_print::print_chars (Dwarf_Die* start_type, target_symbol* e, | |
2826 | print_format* pf) | |
2827 | { | |
2828 | Dwarf_Die type; | |
2829 | dw.resolve_unqualified_inner_typedie (start_type, &type, e); | |
2830 | const char *name = dwarf_diename (&type); | |
2831 | if (name && (name == string("char") || name == string("unsigned char"))) | |
2832 | { | |
c55ea10d JS |
2833 | if (push_deref (pf, "\"%s\"", e)) |
2834 | { | |
2835 | // steal the last arg for a string access | |
2836 | assert (!pf->args.empty()); | |
2837 | functioncall* fcall = new functioncall; | |
2838 | fcall->tok = e->tok; | |
2839 | fcall->function = userspace_p ? "user_string2" : "kernel_string2"; | |
2840 | fcall->args.push_back (pf->args.back()); | |
2841 | expression *err_msg = new literal_string ("<unknown>"); | |
2842 | err_msg->tok = e->tok; | |
2843 | fcall->args.push_back (err_msg); | |
2844 | pf->args.back() = fcall; | |
2845 | } | |
bbee5bb8 JS |
2846 | return true; |
2847 | } | |
2848 | return false; | |
2849 | } | |
2850 | ||
a5ce5211 MW |
2851 | // PR10601: adapt to kernel-vs-userspace loc2c-runtime |
2852 | static const string EMBEDDED_FETCH_DEREF_KERNEL = string("\n") | |
f1e8e7e0 MW |
2853 | + "#define fetch_register k_fetch_register\n" |
2854 | + "#define store_register k_store_register\n" | |
2855 | + "#define deref kderef\n" | |
2856 | + "#define store_deref store_kderef\n"; | |
a5ce5211 MW |
2857 | |
2858 | static const string EMBEDDED_FETCH_DEREF_USER = string("\n") | |
f1e8e7e0 MW |
2859 | + "#define fetch_register u_fetch_register\n" |
2860 | + "#define store_register u_store_register\n" | |
2861 | + "#define deref uderef\n" | |
2862 | + "#define store_deref store_uderef\n"; | |
a5ce5211 MW |
2863 | |
2864 | #define EMBEDDED_FETCH_DEREF(U) \ | |
f1e8e7e0 | 2865 | (U ? EMBEDDED_FETCH_DEREF_USER : EMBEDDED_FETCH_DEREF_KERNEL) |
a5ce5211 MW |
2866 | |
2867 | static const string EMBEDDED_FETCH_DEREF_DONE = string("\n") | |
f1e8e7e0 MW |
2868 | + "#undef fetch_register\n" |
2869 | + "#undef store_register\n" | |
2870 | + "#undef deref\n" | |
2871 | + "#undef store_deref\n"; | |
bbee5bb8 | 2872 | |
5f36109e JS |
2873 | expression* |
2874 | dwarf_pretty_print::deref (target_symbol* e) | |
2875 | { | |
2876 | static unsigned tick = 0; | |
2877 | ||
d19a9a82 JS |
2878 | if (!deref_p) |
2879 | { | |
2880 | assert (pointer && e->components.empty()); | |
2881 | return pointer; | |
2882 | } | |
2883 | ||
5f36109e JS |
2884 | // Synthesize a function to dereference the dwarf fields, |
2885 | // with a pointer parameter that is the base tracepoint variable | |
2886 | functiondecl *fdecl = new functiondecl; | |
2887 | fdecl->synthetic = true; | |
2888 | fdecl->tok = e->tok; | |
2889 | embeddedcode *ec = new embeddedcode; | |
2890 | ec->tok = e->tok; | |
2891 | ||
2892 | fdecl->name = "_dwarf_pretty_print_deref_" + lex_cast(tick++); | |
2893 | fdecl->body = ec; | |
2894 | ||
2895 | // Synthesize a functioncall. | |
2896 | functioncall* fcall = new functioncall; | |
2897 | fcall->tok = e->tok; | |
2898 | fcall->function = fdecl->name; | |
5f36109e | 2899 | |
a5ce5211 | 2900 | ec->code += EMBEDDED_FETCH_DEREF(userspace_p); |
5f36109e JS |
2901 | |
2902 | if (pointer) | |
2903 | { | |
2904 | ec->code += dw.literal_stmt_for_pointer (&pointer_type, e, | |
2905 | false, fdecl->type); | |
2906 | ||
2907 | vardecl *v = new vardecl; | |
2908 | v->type = pe_long; | |
2909 | v->name = "pointer"; | |
2910 | v->tok = e->tok; | |
2911 | fdecl->formal_args.push_back(v); | |
2912 | fcall->args.push_back(pointer); | |
2913 | } | |
2914 | else if (!local.empty()) | |
2915 | ec->code += dw.literal_stmt_for_local (scopes, pc, local, e, | |
2916 | false, fdecl->type); | |
2917 | else | |
2918 | ec->code += dw.literal_stmt_for_return (&scopes[0], pc, e, | |
2919 | false, fdecl->type); | |
2920 | ||
2921 | // Any non-literal indexes need to be passed in too. | |
2922 | for (unsigned i = 0; i < e->components.size(); ++i) | |
2923 | if (e->components[i].type == target_symbol::comp_expression_array_index) | |
2924 | { | |
2925 | vardecl *v = new vardecl; | |
2926 | v->type = pe_long; | |
2927 | v->name = "index" + lex_cast(i); | |
2928 | v->tok = e->tok; | |
2929 | fdecl->formal_args.push_back(v); | |
2930 | fcall->args.push_back(e->components[i].expr_index); | |
2931 | } | |
2932 | ||
2933 | ec->code += "/* pure */"; | |
2934 | ec->code += "/* unprivileged */"; | |
2935 | ||
a5ce5211 | 2936 | ec->code += EMBEDDED_FETCH_DEREF_DONE; |
5f36109e | 2937 | |
f8809d54 | 2938 | fdecl->join (dw.sess); |
5f36109e JS |
2939 | return fcall; |
2940 | } | |
2941 | ||
2942 | ||
c55ea10d JS |
2943 | bool |
2944 | dwarf_pretty_print::push_deref (print_format* pf, const string& fmt, | |
2945 | target_symbol* e) | |
2946 | { | |
2947 | expression* e2 = NULL; | |
2948 | try | |
2949 | { | |
2950 | e2 = deref (e); | |
2951 | } | |
2952 | catch (const semantic_error&) | |
2953 | { | |
2954 | pf->raw_components.append ("?"); | |
2955 | return false; | |
2956 | } | |
2957 | pf->raw_components.append (fmt); | |
2958 | pf->args.push_back (e2); | |
2959 | return true; | |
2960 | } | |
2961 | ||
2962 | ||
e57b735a | 2963 | void |
a7999c82 | 2964 | dwarf_var_expanding_visitor::visit_target_symbol_saved_return (target_symbol* e) |
e57b735a | 2965 | { |
a7999c82 JS |
2966 | // Get the full name of the target symbol. |
2967 | stringstream ts_name_stream; | |
2968 | e->print(ts_name_stream); | |
2969 | string ts_name = ts_name_stream.str(); | |
2970 | ||
2971 | // Check and make sure we haven't already seen this target | |
2972 | // variable in this return probe. If we have, just return our | |
2973 | // last replacement. | |
af234c40 | 2974 | map<string, expression *>::iterator i = return_ts_map.find(ts_name); |
a7999c82 | 2975 | if (i != return_ts_map.end()) |
85ecf79a | 2976 | { |
a7999c82 JS |
2977 | provide (i->second); |
2978 | return; | |
2979 | } | |
85ecf79a | 2980 | |
70208613 JS |
2981 | // Attempt the expansion directly first, so if there's a problem with the |
2982 | // variable we won't have a bogus entry probe lying around. Like in | |
2983 | // saveargs(), we pretend for a moment that we're not in a .return. | |
2984 | bool saved_has_return = q.has_return; | |
2985 | q.has_return = false; | |
2986 | expression *repl = e; | |
2987 | replace (repl); | |
2988 | q.has_return = saved_has_return; | |
2989 | target_symbol* n = dynamic_cast<target_symbol*>(repl); | |
2990 | if (n && n->saved_conversion_error) | |
2991 | { | |
2992 | provide (repl); | |
2993 | return; | |
2994 | } | |
2995 | ||
af234c40 JS |
2996 | expression *exp; |
2997 | if (!q.has_process && | |
2998 | strverscmp(q.sess.kernel_base_release.c_str(), "2.6.25") >= 0) | |
140be17a | 2999 | exp = gen_kretprobe_saved_return(repl); |
af234c40 | 3000 | else |
cc9001af | 3001 | exp = gen_mapped_saved_return(repl, e->sym_name()); |
af234c40 JS |
3002 | |
3003 | // Provide the variable to our parent so it can be used as a | |
3004 | // substitute for the target symbol. | |
3005 | provide (exp); | |
3006 | ||
3007 | // Remember this replacement since we might be able to reuse | |
3008 | // it later if the same return probe references this target | |
3009 | // symbol again. | |
3010 | return_ts_map[ts_name] = exp; | |
3011 | } | |
3012 | ||
3013 | expression* | |
70208613 | 3014 | dwarf_var_expanding_visitor::gen_mapped_saved_return(expression* e, |
277c21bc | 3015 | const string& name) |
af234c40 | 3016 | { |
a7999c82 JS |
3017 | // We've got to do several things here to handle target |
3018 | // variables in return probes. | |
85ecf79a | 3019 | |
a7999c82 JS |
3020 | // (1) Synthesize two global arrays. One is the cache of the |
3021 | // target variable and the other contains a thread specific | |
3022 | // nesting level counter. The arrays will look like | |
3023 | // this: | |
3024 | // | |
3025 | // _dwarf_tvar_{name}_{num} | |
3026 | // _dwarf_tvar_{name}_{num}_ctr | |
3027 | ||
3028 | string aname = (string("_dwarf_tvar_") | |
cc9001af | 3029 | + name |
aca66a36 | 3030 | + "_" + lex_cast(tick++)); |
a7999c82 JS |
3031 | vardecl* vd = new vardecl; |
3032 | vd->name = aname; | |
3033 | vd->tok = e->tok; | |
3034 | q.sess.globals.push_back (vd); | |
3035 | ||
3036 | string ctrname = aname + "_ctr"; | |
3037 | vd = new vardecl; | |
3038 | vd->name = ctrname; | |
3039 | vd->tok = e->tok; | |
3040 | q.sess.globals.push_back (vd); | |
3041 | ||
3042 | // (2) Create a new code block we're going to insert at the | |
3043 | // beginning of this probe to get the cached value into a | |
3044 | // temporary variable. We'll replace the target variable | |
3045 | // reference with the temporary variable reference. The code | |
3046 | // will look like this: | |
3047 | // | |
3048 | // _dwarf_tvar_tid = tid() | |
3049 | // _dwarf_tvar_{name}_{num}_tmp | |
3050 | // = _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3051 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3052 | // delete _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3053 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]--] | |
3054 | // if (! _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]) | |
3055 | // delete _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid] | |
3056 | ||
3057 | // (2a) Synthesize the tid temporary expression, which will look | |
3058 | // like this: | |
3059 | // | |
3060 | // _dwarf_tvar_tid = tid() | |
3061 | symbol* tidsym = new symbol; | |
3062 | tidsym->name = string("_dwarf_tvar_tid"); | |
3063 | tidsym->tok = e->tok; | |
85ecf79a | 3064 | |
a7999c82 JS |
3065 | if (add_block == NULL) |
3066 | { | |
3067 | add_block = new block; | |
3068 | add_block->tok = e->tok; | |
8cc799a5 | 3069 | } |
8c819921 | 3070 | |
8cc799a5 JS |
3071 | if (!add_block_tid) |
3072 | { | |
a7999c82 JS |
3073 | // Synthesize a functioncall to grab the thread id. |
3074 | functioncall* fc = new functioncall; | |
3075 | fc->tok = e->tok; | |
3076 | fc->function = string("tid"); | |
8c819921 | 3077 | |
a7999c82 | 3078 | // Assign the tid to '_dwarf_tvar_tid'. |
8c819921 DS |
3079 | assignment* a = new assignment; |
3080 | a->tok = e->tok; | |
3081 | a->op = "="; | |
a7999c82 JS |
3082 | a->left = tidsym; |
3083 | a->right = fc; | |
8c819921 DS |
3084 | |
3085 | expr_statement* es = new expr_statement; | |
3086 | es->tok = e->tok; | |
3087 | es->value = a; | |
8c819921 | 3088 | add_block->statements.push_back (es); |
8cc799a5 | 3089 | add_block_tid = true; |
a7999c82 | 3090 | } |
8c819921 | 3091 | |
a7999c82 JS |
3092 | // (2b) Synthesize an array reference and assign it to a |
3093 | // temporary variable (that we'll use as replacement for the | |
3094 | // target variable reference). It will look like this: | |
3095 | // | |
3096 | // _dwarf_tvar_{name}_{num}_tmp | |
3097 | // = _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3098 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3099 | ||
3100 | arrayindex* ai_tvar_base = new arrayindex; | |
3101 | ai_tvar_base->tok = e->tok; | |
3102 | ||
3103 | symbol* sym = new symbol; | |
3104 | sym->name = aname; | |
3105 | sym->tok = e->tok; | |
3106 | ai_tvar_base->base = sym; | |
3107 | ||
3108 | ai_tvar_base->indexes.push_back(tidsym); | |
3109 | ||
3110 | // We need to create a copy of the array index in its current | |
3111 | // state so we can have 2 variants of it (the original and one | |
3112 | // that post-decrements the second index). | |
3113 | arrayindex* ai_tvar = new arrayindex; | |
3114 | arrayindex* ai_tvar_postdec = new arrayindex; | |
3115 | *ai_tvar = *ai_tvar_base; | |
3116 | *ai_tvar_postdec = *ai_tvar_base; | |
3117 | ||
3118 | // Synthesize the | |
3119 | // "_dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]" used as the | |
3120 | // second index into the array. | |
3121 | arrayindex* ai_ctr = new arrayindex; | |
3122 | ai_ctr->tok = e->tok; | |
3123 | ||
3124 | sym = new symbol; | |
3125 | sym->name = ctrname; | |
3126 | sym->tok = e->tok; | |
3127 | ai_ctr->base = sym; | |
3128 | ai_ctr->indexes.push_back(tidsym); | |
3129 | ai_tvar->indexes.push_back(ai_ctr); | |
3130 | ||
3131 | symbol* tmpsym = new symbol; | |
3132 | tmpsym->name = aname + "_tmp"; | |
3133 | tmpsym->tok = e->tok; | |
3134 | ||
3135 | assignment* a = new assignment; | |
3136 | a->tok = e->tok; | |
3137 | a->op = "="; | |
3138 | a->left = tmpsym; | |
3139 | a->right = ai_tvar; | |
3140 | ||
3141 | expr_statement* es = new expr_statement; | |
3142 | es->tok = e->tok; | |
3143 | es->value = a; | |
3144 | ||
3145 | add_block->statements.push_back (es); | |
3146 | ||
3147 | // (2c) Add a post-decrement to the second array index and | |
3148 | // delete the array value. It will look like this: | |
3149 | // | |
3150 | // delete _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3151 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]--] | |
3152 | ||
3153 | post_crement* pc = new post_crement; | |
3154 | pc->tok = e->tok; | |
3155 | pc->op = "--"; | |
3156 | pc->operand = ai_ctr; | |
3157 | ai_tvar_postdec->indexes.push_back(pc); | |
3158 | ||
3159 | delete_statement* ds = new delete_statement; | |
3160 | ds->tok = e->tok; | |
3161 | ds->value = ai_tvar_postdec; | |
3162 | ||
3163 | add_block->statements.push_back (ds); | |
3164 | ||
3165 | // (2d) Delete the counter value if it is 0. It will look like | |
3166 | // this: | |
3167 | // if (! _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]) | |
3168 | // delete _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid] | |
3169 | ||
3170 | ds = new delete_statement; | |
3171 | ds->tok = e->tok; | |
3172 | ds->value = ai_ctr; | |
3173 | ||
3174 | unary_expression *ue = new unary_expression; | |
3175 | ue->tok = e->tok; | |
3176 | ue->op = "!"; | |
3177 | ue->operand = ai_ctr; | |
3178 | ||
3179 | if_statement *ifs = new if_statement; | |
3180 | ifs->tok = e->tok; | |
3181 | ifs->condition = ue; | |
3182 | ifs->thenblock = ds; | |
3183 | ifs->elseblock = NULL; | |
3184 | ||
3185 | add_block->statements.push_back (ifs); | |
3186 | ||
3187 | // (3) We need an entry probe that saves the value for us in the | |
3188 | // global array we created. Create the entry probe, which will | |
3189 | // look like this: | |
3190 | // | |
2260f4e3 | 3191 | // probe kernel.function("{function}").call { |
a7999c82 JS |
3192 | // _dwarf_tvar_tid = tid() |
3193 | // _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3194 | // ++_dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3195 | // = ${param} | |
3196 | // } | |
3197 | ||
2260f4e3 | 3198 | if (add_call_probe == NULL) |
a7999c82 | 3199 | { |
2260f4e3 FCE |
3200 | add_call_probe = new block; |
3201 | add_call_probe->tok = e->tok; | |
8cc799a5 | 3202 | } |
4baf0e53 | 3203 | |
8cc799a5 JS |
3204 | if (!add_call_probe_tid) |
3205 | { | |
a7999c82 JS |
3206 | // Synthesize a functioncall to grab the thread id. |
3207 | functioncall* fc = new functioncall; | |
3208 | fc->tok = e->tok; | |
3209 | fc->function = string("tid"); | |
4baf0e53 | 3210 | |
a7999c82 JS |
3211 | // Assign the tid to '_dwarf_tvar_tid'. |
3212 | assignment* a = new assignment; | |
8fc05e57 DS |
3213 | a->tok = e->tok; |
3214 | a->op = "="; | |
a7999c82 JS |
3215 | a->left = tidsym; |
3216 | a->right = fc; | |
8fc05e57 | 3217 | |
a7999c82 | 3218 | expr_statement* es = new expr_statement; |
8fc05e57 DS |
3219 | es->tok = e->tok; |
3220 | es->value = a; | |
2260f4e3 | 3221 | add_call_probe = new block(add_call_probe, es); |
8cc799a5 | 3222 | add_call_probe_tid = true; |
85ecf79a | 3223 | } |
cf2a1f85 | 3224 | |
a7999c82 JS |
3225 | // Save the value, like this: |
3226 | // _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3227 | // ++_dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3228 | // = ${param} | |
3229 | arrayindex* ai_tvar_preinc = new arrayindex; | |
3230 | *ai_tvar_preinc = *ai_tvar_base; | |
3231 | ||
3232 | pre_crement* preinc = new pre_crement; | |
3233 | preinc->tok = e->tok; | |
3234 | preinc->op = "++"; | |
3235 | preinc->operand = ai_ctr; | |
3236 | ai_tvar_preinc->indexes.push_back(preinc); | |
3237 | ||
3238 | a = new assignment; | |
3239 | a->tok = e->tok; | |
3240 | a->op = "="; | |
3241 | a->left = ai_tvar_preinc; | |
3242 | a->right = e; | |
3243 | ||
3244 | es = new expr_statement; | |
3245 | es->tok = e->tok; | |
3246 | es->value = a; | |
3247 | ||
2260f4e3 | 3248 | add_call_probe = new block(add_call_probe, es); |
a7999c82 JS |
3249 | |
3250 | // (4) Provide the '_dwarf_tvar_{name}_{num}_tmp' variable to | |
3251 | // our parent so it can be used as a substitute for the target | |
3252 | // symbol. | |
af234c40 JS |
3253 | return tmpsym; |
3254 | } | |
a7999c82 | 3255 | |
af234c40 JS |
3256 | |
3257 | expression* | |
140be17a | 3258 | dwarf_var_expanding_visitor::gen_kretprobe_saved_return(expression* e) |
af234c40 JS |
3259 | { |
3260 | // The code for this is simple. | |
3261 | // | |
3262 | // .call: | |
3263 | // _set_kretprobe_long(index, $value) | |
3264 | // | |
3265 | // .return: | |
3266 | // _get_kretprobe_long(index) | |
3267 | // | |
3268 | // (or s/long/string/ for things like $$parms) | |
3269 | ||
3270 | unsigned index; | |
3271 | string setfn, getfn; | |
3272 | ||
140be17a JS |
3273 | // We need the caller to predetermine the type of the expression! |
3274 | switch (e->type) | |
af234c40 | 3275 | { |
140be17a | 3276 | case pe_string: |
af234c40 JS |
3277 | index = saved_strings++; |
3278 | setfn = "_set_kretprobe_string"; | |
3279 | getfn = "_get_kretprobe_string"; | |
140be17a JS |
3280 | break; |
3281 | case pe_long: | |
af234c40 JS |
3282 | index = saved_longs++; |
3283 | setfn = "_set_kretprobe_long"; | |
3284 | getfn = "_get_kretprobe_long"; | |
140be17a JS |
3285 | break; |
3286 | default: | |
b530b5b3 | 3287 | throw semantic_error(_("unknown type to save in kretprobe"), e->tok); |
af234c40 JS |
3288 | } |
3289 | ||
3290 | // Create the entry code | |
3291 | // _set_kretprobe_{long|string}(index, $value) | |
3292 | ||
3293 | if (add_call_probe == NULL) | |
3294 | { | |
3295 | add_call_probe = new block; | |
3296 | add_call_probe->tok = e->tok; | |
3297 | } | |
3298 | ||
3299 | functioncall* set_fc = new functioncall; | |
3300 | set_fc->tok = e->tok; | |
3301 | set_fc->function = setfn; | |
3302 | set_fc->args.push_back(new literal_number(index)); | |
3303 | set_fc->args.back()->tok = e->tok; | |
3304 | set_fc->args.push_back(e); | |
3305 | ||
3306 | expr_statement* set_es = new expr_statement; | |
3307 | set_es->tok = e->tok; | |
3308 | set_es->value = set_fc; | |
3309 | ||
3310 | add_call_probe->statements.push_back(set_es); | |
3311 | ||
3312 | // Create the return code | |
3313 | // _get_kretprobe_{long|string}(index) | |
3314 | ||
3315 | functioncall* get_fc = new functioncall; | |
3316 | get_fc->tok = e->tok; | |
3317 | get_fc->function = getfn; | |
3318 | get_fc->args.push_back(new literal_number(index)); | |
3319 | get_fc->args.back()->tok = e->tok; | |
3320 | ||
3321 | return get_fc; | |
a7999c82 | 3322 | } |
a43ba433 | 3323 | |
2cb3fe26 | 3324 | |
a7999c82 JS |
3325 | void |
3326 | dwarf_var_expanding_visitor::visit_target_symbol_context (target_symbol* e) | |
3327 | { | |
9aa8ffce | 3328 | if (null_die(scope_die)) |
a7999c82 | 3329 | return; |
2cb3fe26 | 3330 | |
5f36109e JS |
3331 | target_symbol *tsym = new target_symbol(*e); |
3332 | ||
fde50242 JS |
3333 | bool pretty = (!e->components.empty() && |
3334 | e->components[0].type == target_symbol::comp_pretty_print); | |
3335 | string format = pretty ? "=%s" : "=%#x"; | |
a43ba433 | 3336 | |
a7999c82 JS |
3337 | // Convert $$parms to sprintf of a list of parms and active local vars |
3338 | // which we recursively evaluate | |
a43ba433 | 3339 | |
a7999c82 JS |
3340 | // NB: we synthesize a new token here rather than reusing |
3341 | // e->tok, because print_format::print likes to use | |
3342 | // its tok->content. | |
5f36109e | 3343 | token* pf_tok = new token(*e->tok); |
a7999c82 | 3344 | pf_tok->type = tok_identifier; |
b393f6f2 | 3345 | pf_tok->content = "sprintf"; |
2cb3fe26 | 3346 | |
d5e178c1 | 3347 | print_format* pf = print_format::create(pf_tok); |
a7999c82 | 3348 | |
277c21bc | 3349 | if (q.has_return && (e->name == "$$return")) |
a7999c82 | 3350 | { |
277c21bc | 3351 | tsym->name = "$return"; |
a7999c82 JS |
3352 | |
3353 | // Ignore any variable that isn't accessible. | |
3354 | tsym->saved_conversion_error = 0; | |
3355 | expression *texp = tsym; | |
8b095b45 | 3356 | replace (texp); // NB: throws nothing ... |
a7999c82 | 3357 | if (tsym->saved_conversion_error) // ... but this is how we know it happened. |
a43ba433 | 3358 | { |
2cb3fe26 | 3359 | |
a43ba433 FCE |
3360 | } |
3361 | else | |
3362 | { | |
a7999c82 | 3363 | pf->raw_components += "return"; |
5f36109e | 3364 | pf->raw_components += format; |
a7999c82 JS |
3365 | pf->args.push_back(texp); |
3366 | } | |
3367 | } | |
3368 | else | |
3369 | { | |
3370 | // non-.return probe: support $$parms, $$vars, $$locals | |
345bbb3d | 3371 | bool first = true; |
a7999c82 | 3372 | Dwarf_Die result; |
d48bc7eb JS |
3373 | vector<Dwarf_Die> scopes = q.dw.getscopes(scope_die); |
3374 | for (unsigned i = 0; i < scopes.size(); ++i) | |
3375 | { | |
3376 | if (dwarf_tag(&scopes[i]) == DW_TAG_compile_unit) | |
3377 | break; // we don't want file-level variables | |
3378 | if (dwarf_child (&scopes[i], &result) == 0) | |
3379 | do | |
00cf3709 | 3380 | { |
d48bc7eb JS |
3381 | switch (dwarf_tag (&result)) |
3382 | { | |
3383 | case DW_TAG_variable: | |
3384 | if (e->name == "$$parms") | |
3385 | continue; | |
3386 | break; | |
3387 | case DW_TAG_formal_parameter: | |
3388 | if (e->name == "$$locals") | |
3389 | continue; | |
3390 | break; | |
3391 | ||
3392 | default: | |
3393 | continue; | |
3394 | } | |
41c262f3 | 3395 | |
d48bc7eb JS |
3396 | const char *diename = dwarf_diename (&result); |
3397 | if (! diename) continue; | |
f76427a2 | 3398 | |
d48bc7eb JS |
3399 | if (! first) |
3400 | pf->raw_components += " "; | |
3401 | pf->raw_components += diename; | |
fde50242 JS |
3402 | first = false; |
3403 | ||
3404 | // Write a placeholder for ugly aggregates | |
3405 | Dwarf_Die type; | |
3406 | if (!pretty && dwarf_attr_die(&result, DW_AT_type, &type)) | |
3407 | { | |
3408 | q.dw.resolve_unqualified_inner_typedie(&type, &type, e); | |
3409 | switch (dwarf_tag(&type)) | |
3410 | { | |
3411 | case DW_TAG_union_type: | |
3412 | case DW_TAG_structure_type: | |
3413 | case DW_TAG_class_type: | |
3414 | pf->raw_components += "={...}"; | |
3415 | continue; | |
3416 | ||
3417 | case DW_TAG_array_type: | |
3418 | pf->raw_components += "=[...]"; | |
3419 | continue; | |
3420 | } | |
3421 | } | |
345bbb3d | 3422 | |
d48bc7eb JS |
3423 | tsym->name = "$"; |
3424 | tsym->name += diename; | |
41c262f3 | 3425 | |
d48bc7eb JS |
3426 | // Ignore any variable that isn't accessible. |
3427 | tsym->saved_conversion_error = 0; | |
3428 | expression *texp = tsym; | |
3429 | replace (texp); // NB: throws nothing ... | |
3430 | if (tsym->saved_conversion_error) // ... but this is how we know it happened. | |
a43ba433 | 3431 | { |
d48bc7eb JS |
3432 | if (q.sess.verbose>2) |
3433 | { | |
e26c2f83 | 3434 | for (const semantic_error *c = tsym->saved_conversion_error; |
d48bc7eb JS |
3435 | c != 0; |
3436 | c = c->chain) { | |
b530b5b3 | 3437 | clog << _("variable location problem: ") << c->what() << endl; |
d48bc7eb JS |
3438 | } |
3439 | } | |
3440 | ||
3441 | pf->raw_components += "=?"; | |
a43ba433 | 3442 | } |
d48bc7eb JS |
3443 | else |
3444 | { | |
3445 | pf->raw_components += format; | |
3446 | pf->args.push_back(texp); | |
3447 | } | |
a7999c82 | 3448 | } |
d48bc7eb JS |
3449 | while (dwarf_siblingof (&result, &result) == 0); |
3450 | } | |
a7999c82 | 3451 | } |
2cb3fe26 | 3452 | |
a7999c82 | 3453 | pf->components = print_format::string_to_components(pf->raw_components); |
140be17a | 3454 | pf->type = pe_string; |
a7999c82 JS |
3455 | provide (pf); |
3456 | } | |
3457 | ||
2cb3fe26 | 3458 | |
a7999c82 JS |
3459 | void |
3460 | dwarf_var_expanding_visitor::visit_target_symbol (target_symbol *e) | |
3461 | { | |
cc9001af MW |
3462 | assert(e->name.size() > 0 |
3463 | && ((e->name[0] == '$' && e->target_name == "") | |
3464 | || (e->name == "@var" && e->target_name != ""))); | |
a7999c82 | 3465 | visited = true; |
30263a73 FCE |
3466 | bool defined_being_checked = (defined_ops.size() > 0 && (defined_ops.top()->operand == e)); |
3467 | // In this mode, we avoid hiding errors or generating extra code such as for .return saved $vars | |
a7999c82 | 3468 | |
70208613 | 3469 | try |
a7999c82 | 3470 | { |
c69a87e0 FCE |
3471 | bool lvalue = is_active_lvalue(e); |
3472 | if (lvalue && !q.sess.guru_mode) | |
b3741c9d | 3473 | throw semantic_error(_("write to target variable not permitted; need stap -g"), e->tok); |
2cb3fe26 | 3474 | |
100a540e | 3475 | // XXX: process $context vars should be writable |
70208613 | 3476 | |
c69a87e0 FCE |
3477 | // See if we need to generate a new probe to save/access function |
3478 | // parameters from a return probe. PR 1382. | |
3479 | if (q.has_return | |
3480 | && !defined_being_checked | |
277c21bc JS |
3481 | && e->name != "$return" // not the special return-value variable handled below |
3482 | && e->name != "$$return") // nor the other special variable handled below | |
c69a87e0 FCE |
3483 | { |
3484 | if (lvalue) | |
b530b5b3 | 3485 | throw semantic_error(_("write to target variable not permitted in .return probes"), e->tok); |
c69a87e0 FCE |
3486 | visit_target_symbol_saved_return(e); |
3487 | return; | |
3488 | } | |
e57b735a | 3489 | |
277c21bc JS |
3490 | if (e->name == "$$vars" || e->name == "$$parms" || e->name == "$$locals" |
3491 | || (q.has_return && (e->name == "$$return"))) | |
c69a87e0 FCE |
3492 | { |
3493 | if (lvalue) | |
b530b5b3 | 3494 | throw semantic_error(_("cannot write to context variable"), e->tok); |
70208613 | 3495 | |
c69a87e0 | 3496 | if (e->addressof) |
b530b5b3 | 3497 | throw semantic_error(_("cannot take address of context variable"), e->tok); |
70208613 | 3498 | |
5f36109e JS |
3499 | e->assert_no_components("dwarf", true); |
3500 | ||
c69a87e0 FCE |
3501 | visit_target_symbol_context(e); |
3502 | return; | |
3503 | } | |
70208613 | 3504 | |
5f36109e JS |
3505 | if (!e->components.empty() && |
3506 | e->components.back().type == target_symbol::comp_pretty_print) | |
3507 | { | |
3508 | if (lvalue) | |
b530b5b3 | 3509 | throw semantic_error(_("cannot write to pretty-printed variable"), e->tok); |
5f36109e | 3510 | |
277c21bc | 3511 | if (q.has_return && (e->name == "$return")) |
5f36109e JS |
3512 | { |
3513 | dwarf_pretty_print dpp (q.dw, scope_die, addr, | |
3514 | q.has_process, *e); | |
3515 | dpp.expand()->visit(this); | |
3516 | } | |
3517 | else | |
3518 | { | |
3519 | dwarf_pretty_print dpp (q.dw, getscopes(e), addr, | |
cc9001af | 3520 | e->sym_name(), |
5f36109e JS |
3521 | q.has_process, *e); |
3522 | dpp.expand()->visit(this); | |
3523 | } | |
3524 | return; | |
3525 | } | |
3526 | ||
c69a87e0 FCE |
3527 | // Synthesize a function. |
3528 | functiondecl *fdecl = new functiondecl; | |
59de45f1 | 3529 | fdecl->synthetic = true; |
c69a87e0 FCE |
3530 | fdecl->tok = e->tok; |
3531 | embeddedcode *ec = new embeddedcode; | |
3532 | ec->tok = e->tok; | |
70208613 | 3533 | |
c69a87e0 | 3534 | string fname = (string(lvalue ? "_dwarf_tvar_set" : "_dwarf_tvar_get") |
cc9001af | 3535 | + "_" + e->sym_name() |
c69a87e0 | 3536 | + "_" + lex_cast(tick++)); |
70208613 | 3537 | |
a5ce5211 | 3538 | ec->code += EMBEDDED_FETCH_DEREF(q.has_process); |
70208613 | 3539 | |
277c21bc | 3540 | if (q.has_return && (e->name == "$return")) |
e19fda4e | 3541 | { |
b5a0dd41 | 3542 | ec->code += q.dw.literal_stmt_for_return (scope_die, |
e19fda4e | 3543 | addr, |
b4c34c26 | 3544 | e, |
e19fda4e DS |
3545 | lvalue, |
3546 | fdecl->type); | |
3547 | } | |
3548 | else | |
3549 | { | |
b5a0dd41 | 3550 | ec->code += q.dw.literal_stmt_for_local (getscopes(e), |
e19fda4e | 3551 | addr, |
cc9001af | 3552 | e->sym_name(), |
b4c34c26 | 3553 | e, |
e19fda4e DS |
3554 | lvalue, |
3555 | fdecl->type); | |
3556 | } | |
3557 | ||
1b07c728 FCE |
3558 | if (! lvalue) |
3559 | ec->code += "/* pure */"; | |
64211010 DB |
3560 | |
3561 | ec->code += "/* unprivileged */"; | |
a5ce5211 | 3562 | ec->code += EMBEDDED_FETCH_DEREF_DONE; |
c69a87e0 FCE |
3563 | |
3564 | fdecl->name = fname; | |
3565 | fdecl->body = ec; | |
70208613 | 3566 | |
c69a87e0 FCE |
3567 | // Any non-literal indexes need to be passed in too. |
3568 | for (unsigned i = 0; i < e->components.size(); ++i) | |
3569 | if (e->components[i].type == target_symbol::comp_expression_array_index) | |
3570 | { | |
3571 | vardecl *v = new vardecl; | |
3572 | v->type = pe_long; | |
3573 | v->name = "index" + lex_cast(i); | |
3574 | v->tok = e->tok; | |
3575 | fdecl->formal_args.push_back(v); | |
3576 | } | |
70208613 | 3577 | |
c69a87e0 FCE |
3578 | if (lvalue) |
3579 | { | |
3580 | // Modify the fdecl so it carries a single pe_long formal | |
3581 | // argument called "value". | |
70208613 | 3582 | |
c69a87e0 FCE |
3583 | // FIXME: For the time being we only support setting target |
3584 | // variables which have base types; these are 'pe_long' in | |
3585 | // stap's type vocabulary. Strings and pointers might be | |
3586 | // reasonable, some day, but not today. | |
70208613 | 3587 | |
c69a87e0 FCE |
3588 | vardecl *v = new vardecl; |
3589 | v->type = pe_long; | |
3590 | v->name = "value"; | |
3591 | v->tok = e->tok; | |
3592 | fdecl->formal_args.push_back(v); | |
3593 | } | |
f8809d54 | 3594 | fdecl->join (q.sess); |
70208613 | 3595 | |
c69a87e0 FCE |
3596 | // Synthesize a functioncall. |
3597 | functioncall* n = new functioncall; | |
3598 | n->tok = e->tok; | |
3599 | n->function = fname; | |
140be17a | 3600 | n->type = fdecl->type; |
70208613 | 3601 | |
c69a87e0 FCE |
3602 | // Any non-literal indexes need to be passed in too. |
3603 | for (unsigned i = 0; i < e->components.size(); ++i) | |
3604 | if (e->components[i].type == target_symbol::comp_expression_array_index) | |
3605 | n->args.push_back(require(e->components[i].expr_index)); | |
70208613 | 3606 | |
c69a87e0 FCE |
3607 | if (lvalue) |
3608 | { | |
3609 | // Provide the functioncall to our parent, so that it can be | |
3610 | // used to substitute for the assignment node immediately above | |
3611 | // us. | |
3612 | assert(!target_symbol_setter_functioncalls.empty()); | |
3613 | *(target_symbol_setter_functioncalls.top()) = n; | |
3614 | } | |
70208613 | 3615 | |
c69a87e0 | 3616 | provide (n); |
66d284f4 FCE |
3617 | } |
3618 | catch (const semantic_error& er) | |
3619 | { | |
9fab2262 JS |
3620 | // We suppress this error message, and pass the unresolved |
3621 | // target_symbol to the next pass. We hope that this value ends | |
3622 | // up not being referenced after all, so it can be optimized out | |
3623 | // quietly. | |
1af1e62d | 3624 | e->chain (er); |
9fab2262 | 3625 | provide (e); |
66d284f4 | 3626 | } |
77de5e9e GH |
3627 | } |
3628 | ||
3629 | ||
c24447be JS |
3630 | void |
3631 | dwarf_var_expanding_visitor::visit_cast_op (cast_op *e) | |
3632 | { | |
3633 | // Fill in our current module context if needed | |
3634 | if (e->module.empty()) | |
3635 | e->module = q.dw.module_name; | |
3636 | ||
3637 | var_expanding_visitor::visit_cast_op(e); | |
3638 | } | |
3639 | ||
3640 | ||
8cc799a5 JS |
3641 | void |
3642 | dwarf_var_expanding_visitor::visit_entry_op (entry_op *e) | |
3643 | { | |
3644 | expression *repl = e; | |
3645 | if (q.has_return) | |
3646 | { | |
3647 | // expand the operand as if it weren't a return probe | |
3648 | q.has_return = false; | |
3649 | replace (e->operand); | |
3650 | q.has_return = true; | |
3651 | ||
3652 | // XXX it would be nice to use gen_kretprobe_saved_return when available, | |
3653 | // but it requires knowing the types already, which is problematic for | |
3654 | // arbitrary expressons. | |
cc9001af | 3655 | repl = gen_mapped_saved_return (e->operand, "entry"); |
8cc799a5 JS |
3656 | } |
3657 | provide (repl); | |
3658 | } | |
3659 | ||
bfa7e523 MW |
3660 | vector<Dwarf_Die>& |
3661 | dwarf_var_expanding_visitor::getcuscope(target_symbol *e) | |
3662 | { | |
54e9f062 MW |
3663 | Dwarf_Off cu_off = 0; |
3664 | const char *cu_name = NULL; | |
bfa7e523 MW |
3665 | |
3666 | string prefixed_srcfile = string("*/") + e->cu_name; | |
3667 | ||
3668 | Dwarf_Off off = 0; | |
3669 | size_t cuhl; | |
3670 | Dwarf_Off noff; | |
3671 | Dwarf_Off module_bias; | |
3672 | Dwarf *dw = dwfl_module_getdwarf(q.dw.module, &module_bias); | |
54e9f062 | 3673 | while (dwarf_nextcu (dw, off, &noff, &cuhl, NULL, NULL, NULL) == 0) |
bfa7e523 MW |
3674 | { |
3675 | Dwarf_Die die_mem; | |
3676 | Dwarf_Die *die; | |
3677 | die = dwarf_offdie (dw, off + cuhl, &die_mem); | |
54e9f062 MW |
3678 | const char *die_name = dwarf_diename (die); |
3679 | ||
3680 | if (strcmp (die_name, e->cu_name.c_str()) == 0) // Perfect match. | |
3681 | { | |
3682 | cu_name = die_name; | |
3683 | cu_off = off + cuhl; | |
3684 | break; | |
3685 | } | |
3686 | ||
3687 | if (fnmatch(prefixed_srcfile.c_str(), die_name, 0) == 0) | |
3688 | if (cu_name == NULL || strlen (die_name) < strlen (cu_name)) | |
3689 | { | |
3690 | cu_name = die_name; | |
3691 | cu_off = off + cuhl; | |
3692 | } | |
bfa7e523 MW |
3693 | off = noff; |
3694 | } | |
3695 | ||
54e9f062 | 3696 | if (cu_name == NULL) |
bfa7e523 MW |
3697 | throw semantic_error ("unable to find CU '" + e->cu_name + "'" |
3698 | + " while searching for '" + e->target_name + "'", | |
3699 | e->tok); | |
3700 | ||
3701 | vector<Dwarf_Die> *cu_scope = new vector<Dwarf_Die>; | |
54e9f062 MW |
3702 | Dwarf_Die cu_die; |
3703 | dwarf_offdie (dw, cu_off, &cu_die); | |
3704 | cu_scope->push_back(cu_die); | |
bfa7e523 MW |
3705 | return *cu_scope; |
3706 | } | |
8cc799a5 | 3707 | |
729455a7 JS |
3708 | vector<Dwarf_Die>& |
3709 | dwarf_var_expanding_visitor::getscopes(target_symbol *e) | |
3710 | { | |
bfa7e523 MW |
3711 | // "static globals" can only be found in the top-level CU. |
3712 | if (e->name == "@var" && e->cu_name != "") | |
3713 | return this->getcuscope(e); | |
3714 | ||
729455a7 JS |
3715 | if (scopes.empty()) |
3716 | { | |
f5958c8f | 3717 | scopes = q.dw.getscopes(scope_die); |
729455a7 | 3718 | if (scopes.empty()) |
b530b5b3 LB |
3719 | //throw semantic_error (_F("unable to find any scopes containing %d", addr), e->tok); |
3720 | // ((scope_die == NULL) ? "" : (string (" in ") + (dwarf_diename(scope_die) ?: "<unknown>") + "(" + (dwarf_diename(q.dw.cu) ?: "<unknown>") ")" )) | |
729455a7 JS |
3721 | throw semantic_error ("unable to find any scopes containing " |
3722 | + lex_cast_hex(addr) | |
3723 | + ((scope_die == NULL) ? "" | |
3724 | : (string (" in ") | |
3725 | + (dwarf_diename(scope_die) ?: "<unknown>") | |
3726 | + "(" + (dwarf_diename(q.dw.cu) ?: "<unknown>") | |
3727 | + ")")) | |
3728 | + " while searching for local '" | |
cc9001af | 3729 | + e->sym_name() + "'", |
729455a7 JS |
3730 | e->tok); |
3731 | } | |
3732 | return scopes; | |
3733 | } | |
3734 | ||
3735 | ||
5f36109e JS |
3736 | struct dwarf_cast_expanding_visitor: public var_expanding_visitor |
3737 | { | |
3738 | systemtap_session& s; | |
3739 | dwarf_builder& db; | |
3740 | ||
3741 | dwarf_cast_expanding_visitor(systemtap_session& s, dwarf_builder& db): | |
3742 | s(s), db(db) {} | |
3743 | void visit_cast_op (cast_op* e); | |
3744 | void filter_special_modules(string& module); | |
3745 | }; | |
3746 | ||
3747 | ||
c4ce66a1 JS |
3748 | struct dwarf_cast_query : public base_query |
3749 | { | |
946e1a48 | 3750 | cast_op& e; |
c4ce66a1 | 3751 | const bool lvalue; |
5f36109e JS |
3752 | const bool userspace_p; |
3753 | functioncall*& result; | |
c4ce66a1 | 3754 | |
5f36109e JS |
3755 | dwarf_cast_query(dwflpp& dw, const string& module, cast_op& e, bool lvalue, |
3756 | const bool userspace_p, functioncall*& result): | |
abb41d92 | 3757 | base_query(dw, module), e(e), lvalue(lvalue), |
5f36109e | 3758 | userspace_p(userspace_p), result(result) {} |
c4ce66a1 JS |
3759 | |
3760 | void handle_query_module(); | |
822a6a3d | 3761 | void query_library (const char *) {} |
576eaefe | 3762 | void query_plt (const char *entry, size_t addr) {} |
c4ce66a1 JS |
3763 | }; |
3764 | ||
3765 | ||
c4ce66a1 JS |
3766 | void |
3767 | dwarf_cast_query::handle_query_module() | |
3768 | { | |
5f36109e JS |
3769 | static unsigned tick = 0; |
3770 | ||
3771 | if (result) | |
c4ce66a1 JS |
3772 | return; |
3773 | ||
ea1e477a | 3774 | // look for the type in any CU |
a44a7cb5 JS |
3775 | Dwarf_Die* type_die = NULL; |
3776 | if (startswith(e.type_name, "class ")) | |
3777 | { | |
3778 | // normalize to match dwflpp::global_alias_caching_callback | |
3779 | string struct_name = "struct " + e.type_name.substr(6); | |
3780 | type_die = dw.declaration_resolve_other_cus(struct_name); | |
3781 | } | |
3782 | else | |
3783 | type_die = dw.declaration_resolve_other_cus(e.type_name); | |
3784 | ||
3785 | // NB: We now index the types as "struct name"/"union name"/etc. instead of | |
3786 | // just "name". But since we didn't require users to be explicit before, and | |
3787 | // actually sort of discouraged it, we must be flexible now. So if a lookup | |
3788 | // fails with a bare name, try augmenting it. | |
3789 | if (!type_die && | |
3790 | !startswith(e.type_name, "class ") && | |
3791 | !startswith(e.type_name, "struct ") && | |
3792 | !startswith(e.type_name, "union ") && | |
3793 | !startswith(e.type_name, "enum ")) | |
3794 | { | |
3795 | type_die = dw.declaration_resolve_other_cus("struct " + e.type_name); | |
3796 | if (!type_die) | |
3797 | type_die = dw.declaration_resolve_other_cus("union " + e.type_name); | |
3798 | if (!type_die) | |
3799 | type_die = dw.declaration_resolve_other_cus("enum " + e.type_name); | |
3800 | } | |
3801 | ||
ea1e477a JS |
3802 | if (!type_die) |
3803 | return; | |
c4ce66a1 | 3804 | |
5f36109e JS |
3805 | string code; |
3806 | exp_type type = pe_long; | |
3807 | ||
ea1e477a | 3808 | try |
c4ce66a1 | 3809 | { |
ea1e477a JS |
3810 | Dwarf_Die cu_mem; |
3811 | dw.focus_on_cu(dwarf_diecu(type_die, &cu_mem, NULL, NULL)); | |
5f36109e JS |
3812 | |
3813 | if (!e.components.empty() && | |
3814 | e.components.back().type == target_symbol::comp_pretty_print) | |
3815 | { | |
3816 | if (lvalue) | |
b530b5b3 | 3817 | throw semantic_error(_("cannot write to pretty-printed variable"), e.tok); |
5f36109e | 3818 | |
d19a9a82 | 3819 | dwarf_pretty_print dpp(dw, type_die, e.operand, true, userspace_p, e); |
5f36109e JS |
3820 | result = dpp.expand(); |
3821 | return; | |
3822 | } | |
3823 | ||
3824 | code = dw.literal_stmt_for_pointer (type_die, &e, lvalue, type); | |
ea1e477a JS |
3825 | } |
3826 | catch (const semantic_error& er) | |
3827 | { | |
3828 | // NB: we can have multiple errors, since a @cast | |
1af1e62d JS |
3829 | // may be attempted using several different modules: |
3830 | // @cast(ptr, "type", "module1:module2:...") | |
3831 | e.chain (er); | |
c4ce66a1 | 3832 | } |
c4ce66a1 | 3833 | |
5f36109e JS |
3834 | if (code.empty()) |
3835 | return; | |
c4ce66a1 | 3836 | |
5f36109e | 3837 | string fname = (string(lvalue ? "_dwarf_cast_set" : "_dwarf_cast_get") |
cc9001af | 3838 | + "_" + e.sym_name() |
5f36109e | 3839 | + "_" + lex_cast(tick++)); |
c4ce66a1 | 3840 | |
5f36109e JS |
3841 | // Synthesize a function. |
3842 | functiondecl *fdecl = new functiondecl; | |
3843 | fdecl->synthetic = true; | |
3844 | fdecl->tok = e.tok; | |
3845 | fdecl->type = type; | |
3846 | fdecl->name = fname; | |
3847 | ||
3848 | embeddedcode *ec = new embeddedcode; | |
3849 | ec->tok = e.tok; | |
3850 | fdecl->body = ec; | |
3851 | ||
a5ce5211 | 3852 | ec->code += EMBEDDED_FETCH_DEREF(userspace_p); |
5f36109e JS |
3853 | ec->code += code; |
3854 | ||
3855 | // Give the fdecl an argument for the pointer we're trying to cast | |
3856 | vardecl *v1 = new vardecl; | |
3857 | v1->type = pe_long; | |
3858 | v1->name = "pointer"; | |
3859 | v1->tok = e.tok; | |
3860 | fdecl->formal_args.push_back(v1); | |
3861 | ||
3862 | // Any non-literal indexes need to be passed in too. | |
3863 | for (unsigned i = 0; i < e.components.size(); ++i) | |
3864 | if (e.components[i].type == target_symbol::comp_expression_array_index) | |
3865 | { | |
3866 | vardecl *v = new vardecl; | |
3867 | v->type = pe_long; | |
3868 | v->name = "index" + lex_cast(i); | |
3869 | v->tok = e.tok; | |
3870 | fdecl->formal_args.push_back(v); | |
3871 | } | |
3872 | ||
3873 | if (lvalue) | |
3874 | { | |
3875 | // Modify the fdecl so it carries a second pe_long formal | |
3876 | // argument called "value". | |
3877 | ||
3878 | // FIXME: For the time being we only support setting target | |
3879 | // variables which have base types; these are 'pe_long' in | |
3880 | // stap's type vocabulary. Strings and pointers might be | |
3881 | // reasonable, some day, but not today. | |
3882 | ||
3883 | vardecl *v2 = new vardecl; | |
3884 | v2->type = pe_long; | |
3885 | v2->name = "value"; | |
3886 | v2->tok = e.tok; | |
3887 | fdecl->formal_args.push_back(v2); | |
3888 | } | |
3889 | else | |
3890 | ec->code += "/* pure */"; | |
3891 | ||
3892 | ec->code += "/* unprivileged */"; | |
a5ce5211 | 3893 | ec->code += EMBEDDED_FETCH_DEREF_DONE; |
5f36109e | 3894 | |
f8809d54 | 3895 | fdecl->join (dw.sess); |
5f36109e JS |
3896 | |
3897 | // Synthesize a functioncall. | |
3898 | functioncall* n = new functioncall; | |
3899 | n->tok = e.tok; | |
3900 | n->function = fname; | |
5f36109e JS |
3901 | n->args.push_back(e.operand); |
3902 | ||
3903 | // Any non-literal indexes need to be passed in too. | |
3904 | for (unsigned i = 0; i < e.components.size(); ++i) | |
3905 | if (e.components[i].type == target_symbol::comp_expression_array_index) | |
3906 | n->args.push_back(e.components[i].expr_index); | |
3907 | ||
3908 | result = n; | |
3909 | } | |
c4ce66a1 JS |
3910 | |
3911 | ||
fb0274bc JS |
3912 | void dwarf_cast_expanding_visitor::filter_special_modules(string& module) |
3913 | { | |
d90053e7 | 3914 | // look for "<path/to/header>" or "kernel<path/to/header>" |
fb0274bc | 3915 | // for those cases, build a module including that header |
d90053e7 | 3916 | if (module[module.size() - 1] == '>' && |
60d98537 | 3917 | (module[0] == '<' || startswith(module, "kernel<"))) |
fb0274bc JS |
3918 | { |
3919 | string cached_module; | |
3920 | if (s.use_cache) | |
3921 | { | |
3922 | // see if the cached module exists | |
a2639cb7 | 3923 | cached_module = find_typequery_hash(s, module); |
d105f664 | 3924 | if (!cached_module.empty() && !s.poison_cache) |
fb0274bc JS |
3925 | { |
3926 | int fd = open(cached_module.c_str(), O_RDONLY); | |
3927 | if (fd != -1) | |
3928 | { | |
3929 | if (s.verbose > 2) | |
b530b5b3 LB |
3930 | //TRANSLATORS: Here we're using a cached module. |
3931 | clog << _("Pass 2: using cached ") << cached_module << endl; | |
fb0274bc JS |
3932 | module = cached_module; |
3933 | close(fd); | |
3934 | return; | |
3935 | } | |
3936 | } | |
3937 | } | |
3938 | ||
3939 | // no cached module, time to make it | |
d90053e7 | 3940 | if (make_typequery(s, module) == 0) |
fb0274bc | 3941 | { |
e16dc041 | 3942 | // try to save typequery in the cache |
fb0274bc | 3943 | if (s.use_cache) |
e16dc041 | 3944 | copy_file(module, cached_module, s.verbose > 2); |
fb0274bc JS |
3945 | } |
3946 | } | |
3947 | } | |
3948 | ||
3949 | ||
c4ce66a1 JS |
3950 | void dwarf_cast_expanding_visitor::visit_cast_op (cast_op* e) |
3951 | { | |
3952 | bool lvalue = is_active_lvalue(e); | |
3953 | if (lvalue && !s.guru_mode) | |
b3741c9d | 3954 | throw semantic_error(_("write to @cast context variable not permitted; need stap -g"), e->tok); |
c4ce66a1 JS |
3955 | |
3956 | if (e->module.empty()) | |
3957 | e->module = "kernel"; // "*" may also be reasonable to search all kernel modules | |
3958 | ||
5f36109e | 3959 | functioncall* result = NULL; |
8b31197b JS |
3960 | |
3961 | // split the module string by ':' for alternatives | |
3962 | vector<string> modules; | |
3963 | tokenize(e->module, modules, ":"); | |
b5a0dd41 | 3964 | bool userspace_p=false; // PR10601 |
5f36109e | 3965 | for (unsigned i = 0; !result && i < modules.size(); ++i) |
c4ce66a1 | 3966 | { |
8b31197b | 3967 | string& module = modules[i]; |
fb0274bc | 3968 | filter_special_modules(module); |
abb41d92 | 3969 | |
c4ce66a1 JS |
3970 | // NB: This uses '/' to distinguish between kernel modules and userspace, |
3971 | // which means that userspace modules won't get any PATH searching. | |
3972 | dwflpp* dw; | |
707bf35e JS |
3973 | try |
3974 | { | |
b5a0dd41 FCE |
3975 | userspace_p=is_user_module (module); |
3976 | if (! userspace_p) | |
707bf35e JS |
3977 | { |
3978 | // kernel or kernel module target | |
ae2552da | 3979 | dw = db.get_kern_dw(s, module); |
707bf35e JS |
3980 | } |
3981 | else | |
3982 | { | |
05fb3e0c | 3983 | module = find_executable (module, "", s.sysenv); // canonicalize it |
707bf35e JS |
3984 | dw = db.get_user_dw(s, module); |
3985 | } | |
3986 | } | |
3987 | catch (const semantic_error& er) | |
3988 | { | |
3989 | /* ignore and go to the next module */ | |
3990 | continue; | |
3991 | } | |
c4ce66a1 | 3992 | |
5f36109e | 3993 | dwarf_cast_query q (*dw, module, *e, lvalue, userspace_p, result); |
51178501 | 3994 | dw->iterate_over_modules(&query_module, &q); |
c4ce66a1 | 3995 | } |
abb41d92 | 3996 | |
5f36109e | 3997 | if (!result) |
c4ce66a1 | 3998 | { |
946e1a48 JS |
3999 | // We pass the unresolved cast_op to the next pass, and hope |
4000 | // that this value ends up not being referenced after all, so | |
4001 | // it can be optimized out quietly. | |
c4ce66a1 JS |
4002 | provide (e); |
4003 | return; | |
4004 | } | |
4005 | ||
c4ce66a1 JS |
4006 | if (lvalue) |
4007 | { | |
4008 | // Provide the functioncall to our parent, so that it can be | |
4009 | // used to substitute for the assignment node immediately above | |
4010 | // us. | |
4011 | assert(!target_symbol_setter_functioncalls.empty()); | |
5f36109e | 4012 | *(target_symbol_setter_functioncalls.top()) = result; |
c4ce66a1 JS |
4013 | } |
4014 | ||
5f36109e | 4015 | result->visit (this); |
77de5e9e GH |
4016 | } |
4017 | ||
4018 | ||
b8da0ad1 FCE |
4019 | void |
4020 | dwarf_derived_probe::printsig (ostream& o) const | |
4021 | { | |
4022 | // Instead of just printing the plain locations, we add a PC value | |
4023 | // as a comment as a way of telling e.g. apart multiple inlined | |
4024 | // function instances. This is distinct from the verbose/clog | |
4025 | // output, since this part goes into the cache hash calculations. | |
4026 | sole_location()->print (o); | |
6d0f3f0c | 4027 | o << " /* pc=" << section << "+0x" << hex << addr << dec << " */"; |
b8da0ad1 FCE |
4028 | printsig_nested (o); |
4029 | } | |
4030 | ||
4031 | ||
4032 | ||
dc38c0ae | 4033 | void |
b20febf3 FCE |
4034 | dwarf_derived_probe::join_group (systemtap_session& s) |
4035 | { | |
af234c40 JS |
4036 | // skip probes which are paired entry-handlers |
4037 | if (!has_return && (saved_longs || saved_strings)) | |
4038 | return; | |
4039 | ||
b20febf3 FCE |
4040 | if (! s.dwarf_derived_probes) |
4041 | s.dwarf_derived_probes = new dwarf_derived_probe_group (); | |
4042 | s.dwarf_derived_probes->enroll (this); | |
b642c901 | 4043 | |
62f52bb0 JS |
4044 | if (sdt_semaphore_addr != 0) |
4045 | enable_task_finder(s); | |
b20febf3 FCE |
4046 | } |
4047 | ||
4048 | ||
2b69faaf JS |
4049 | static bool |
4050 | kernel_supports_inode_uprobes(systemtap_session& s) | |
4051 | { | |
4052 | // The arch-supports is new to the builtin inode-uprobes, so it makes a | |
4053 | // reasonable indicator of the new API. Else we'll need an autoconf... | |
64e807c2 | 4054 | // see also buildrun.cxx:kernel_built_uprobs() |
2b69faaf JS |
4055 | return (s.kernel_config["CONFIG_ARCH_SUPPORTS_UPROBES"] == "y" |
4056 | && s.kernel_config["CONFIG_UPROBES"] == "y"); | |
4057 | } | |
4058 | ||
4059 | ||
5261f7ab DS |
4060 | void |
4061 | check_process_probe_kernel_support(systemtap_session& s) | |
4062 | { | |
4063 | // If we've got utrace, we're good to go. | |
4064 | if (s.kernel_config["CONFIG_UTRACE"] == "y") | |
4065 | return; | |
4066 | ||
8c021542 DS |
4067 | // We don't have utrace. For process probes that aren't |
4068 | // uprobes-based, we just need the task_finder. The task_finder | |
4069 | // needs CONFIG_TRACEPOINTS and specific tracepoints (and perhaps | |
4070 | // some CONFIG_FTRACE support). There are specific autoconf tests | |
4071 | // for its needs. | |
4072 | // | |
4073 | // We'll just require CONFIG_TRACEPOINTS here as a quick-and-dirty | |
4074 | // approximation. | |
4075 | if (! s.need_uprobes && s.kernel_config["CONFIG_TRACEPOINTS"] == "y") | |
4076 | return; | |
4077 | ||
d3e959b0 DS |
4078 | // For uprobes-based process probes, we need the task_finder plus |
4079 | // the builtin inode-uprobes. | |
8c021542 DS |
4080 | if (s.need_uprobes |
4081 | && s.kernel_config["CONFIG_TRACEPOINTS"] == "y" | |
d3e959b0 | 4082 | && kernel_supports_inode_uprobes(s)) |
8c021542 DS |
4083 | return; |
4084 | ||
4085 | throw semantic_error (_("process probes not available without kernel CONFIG_UTRACE or CONFIG_TRACEPOINTS/CONFIG_ARCH_SUPPORTS_UPROBES/CONFIG_UPROBES")); | |
5261f7ab DS |
4086 | } |
4087 | ||
4088 | ||
b20febf3 FCE |
4089 | dwarf_derived_probe::dwarf_derived_probe(const string& funcname, |
4090 | const string& filename, | |
4091 | int line, | |
91af0778 | 4092 | // module & section specify a relocation |
b20febf3 FCE |
4093 | // base for <addr>, unless section=="" |
4094 | // (equivalently module=="kernel") | |
4095 | const string& module, | |
4096 | const string& section, | |
4097 | // NB: dwfl_addr is the virtualized | |
4098 | // address for this symbol. | |
4099 | Dwarf_Addr dwfl_addr, | |
4100 | // addr is the section-offset for | |
4101 | // actual relocation. | |
4102 | Dwarf_Addr addr, | |
4103 | dwarf_query& q, | |
37ebca01 | 4104 | Dwarf_Die* scope_die /* may be null */) |
4c5d1300 | 4105 | : derived_probe (q.base_probe, q.base_loc, true /* .components soon rewritten */ ), |
b20febf3 | 4106 | module (module), section (section), addr (addr), |
63b4fd14 | 4107 | path (q.path), |
27dc09b1 | 4108 | has_process (q.has_process), |
c9bad430 DS |
4109 | has_return (q.has_return), |
4110 | has_maxactive (q.has_maxactive), | |
c57ea854 | 4111 | has_library (q.has_library), |
6b66b9f7 | 4112 | maxactive_val (q.maxactive_val), |
b642c901 SC |
4113 | user_path (q.user_path), |
4114 | user_lib (q.user_lib), | |
af234c40 | 4115 | access_vars(false), |
c57ea854 | 4116 | saved_longs(0), saved_strings(0), |
af234c40 | 4117 | entry_handler(0) |
bd2b1e68 | 4118 | { |
b642c901 SC |
4119 | if (user_lib.size() != 0) |
4120 | has_library = true; | |
4121 | ||
6b66b9f7 JS |
4122 | if (q.has_process) |
4123 | { | |
4124 | // We may receive probes on two types of ELF objects: ET_EXEC or ET_DYN. | |
4125 | // ET_EXEC ones need no further relocation on the addr(==dwfl_addr), whereas | |
4126 | // ET_DYN ones do (addr += run-time mmap base address). We tell these apart | |
4127 | // by the incoming section value (".absolute" vs. ".dynamic"). | |
4128 | // XXX Assert invariants here too? | |
2b69faaf JS |
4129 | |
4130 | // inode-uprobes needs an offset rather than an absolute VM address. | |
4131 | if (kernel_supports_inode_uprobes(q.dw.sess) && | |
4132 | section == ".absolute" && addr == dwfl_addr && | |
4133 | addr >= q.dw.module_start && addr < q.dw.module_end) | |
4134 | this->addr = addr - q.dw.module_start; | |
6b66b9f7 JS |
4135 | } |
4136 | else | |
4137 | { | |
4138 | // Assert kernel relocation invariants | |
4139 | if (section == "" && dwfl_addr != addr) // addr should be absolute | |
ce0f6648 | 4140 | throw semantic_error (_("missing relocation basis"), tok); |
6b66b9f7 | 4141 | if (section != "" && dwfl_addr == addr) // addr should be an offset |
b530b5b3 | 4142 | throw semantic_error (_("inconsistent relocation address"), tok); |
6b66b9f7 | 4143 | } |
2930abc7 | 4144 | |
21beacc9 FCE |
4145 | // XXX: hack for strange g++/gcc's |
4146 | #ifndef USHRT_MAX | |
4147 | #define USHRT_MAX 32767 | |
4148 | #endif | |
4149 | ||
606fd9c8 | 4150 | // Range limit maxactive() value |
6b66b9f7 | 4151 | if (has_maxactive && (maxactive_val < 0 || maxactive_val > USHRT_MAX)) |
b530b5b3 LB |
4152 | throw semantic_error (_F("maxactive value out of range [0,%s]", |
4153 | lex_cast(USHRT_MAX).c_str()), q.base_loc->components.front()->tok); | |
606fd9c8 | 4154 | |
de688825 | 4155 | // Expand target variables in the probe body |
5f0a03a6 | 4156 | if (!null_die(scope_die)) |
8fc05e57 | 4157 | { |
6b66b9f7 | 4158 | // XXX: user-space deref's for q.has_process! |
de688825 | 4159 | dwarf_var_expanding_visitor v (q, scope_die, dwfl_addr); |
8b095b45 | 4160 | v.replace (this->body); |
6b66b9f7 JS |
4161 | if (!q.has_process) |
4162 | access_vars = v.visited; | |
37ebca01 FCE |
4163 | |
4164 | // If during target-variable-expanding the probe, we added a new block | |
4165 | // of code, add it to the start of the probe. | |
4166 | if (v.add_block) | |
ba6f838d | 4167 | this->body = new block(v.add_block, this->body); |
2260f4e3 FCE |
4168 | |
4169 | // If when target-variable-expanding the probe, we need to synthesize a | |
4170 | // sibling function-entry probe. We don't go through the whole probe derivation | |
4171 | // business (PR10642) that could lead to wildcard/alias resolution, or for that | |
4172 | // dwarf-induced duplication. | |
4173 | if (v.add_call_probe) | |
37ebca01 | 4174 | { |
2260f4e3 FCE |
4175 | assert (q.has_return && !q.has_call); |
4176 | ||
4177 | // We temporarily replace q.base_probe. | |
4178 | statement* old_body = q.base_probe->body; | |
4179 | q.base_probe->body = v.add_call_probe; | |
4180 | q.has_return = false; | |
4181 | q.has_call = true; | |
af234c40 | 4182 | |
da23eceb | 4183 | if (q.has_process) |
af234c40 JS |
4184 | entry_handler = new uprobe_derived_probe (funcname, filename, line, |
4185 | module, section, dwfl_addr, | |
4186 | addr, q, scope_die); | |
da23eceb | 4187 | else |
af234c40 JS |
4188 | entry_handler = new dwarf_derived_probe (funcname, filename, line, |
4189 | module, section, dwfl_addr, | |
4190 | addr, q, scope_die); | |
4191 | ||
4192 | saved_longs = entry_handler->saved_longs = v.saved_longs; | |
4193 | saved_strings = entry_handler->saved_strings = v.saved_strings; | |
4194 | ||
4195 | q.results.push_back (entry_handler); | |
2260f4e3 FCE |
4196 | |
4197 | q.has_return = true; | |
4198 | q.has_call = false; | |
4199 | q.base_probe->body = old_body; | |
37ebca01 | 4200 | } |
f10534c6 WH |
4201 | // Save the local variables for listing mode |
4202 | if (q.sess.listing_mode_vars) | |
8c67c337 | 4203 | saveargs(q, scope_die, dwfl_addr); |
8fc05e57 | 4204 | } |
37ebca01 | 4205 | // else - null scope_die - $target variables will produce an error during translate phase |
8fc05e57 | 4206 | |
f10534c6 | 4207 | // PR10820: null scope die, local variables aren't accessible, not necessary to invoke saveargs |
0a98fd42 | 4208 | |
5d23847d | 4209 | // Reset the sole element of the "locations" vector as a |
b20febf3 FCE |
4210 | // "reverse-engineered" form of the incoming (q.base_loc) probe |
4211 | // point. This allows a user to see what function / file / line | |
4212 | // number any particular match of the wildcards. | |
2930abc7 | 4213 | |
a229fcd7 | 4214 | vector<probe_point::component*> comps; |
91af0778 FCE |
4215 | if (q.has_kernel) |
4216 | comps.push_back (new probe_point::component(TOK_KERNEL)); | |
4217 | else if(q.has_module) | |
4218 | comps.push_back (new probe_point::component(TOK_MODULE, new literal_string(module))); | |
4219 | else if(q.has_process) | |
4220 | comps.push_back (new probe_point::component(TOK_PROCESS, new literal_string(module))); | |
4221 | else | |
4222 | assert (0); | |
b5d77020 | 4223 | |
db520b00 FCE |
4224 | string fn_or_stmt; |
4225 | if (q.has_function_str || q.has_function_num) | |
4226 | fn_or_stmt = "function"; | |
4227 | else | |
4228 | fn_or_stmt = "statement"; | |
a229fcd7 | 4229 | |
b8da0ad1 | 4230 | if (q.has_function_str || q.has_statement_str) |
db520b00 | 4231 | { |
4cd232e4 | 4232 | string retro_name = funcname; |
b20febf3 | 4233 | if (filename != "") |
cee35f73 | 4234 | { |
fb84c077 | 4235 | retro_name += ("@" + string (filename)); |
cee35f73 | 4236 | if (line > 0) |
aca66a36 | 4237 | retro_name += (":" + lex_cast (line)); |
cee35f73 | 4238 | } |
db520b00 FCE |
4239 | comps.push_back |
4240 | (new probe_point::component | |
4241 | (fn_or_stmt, new literal_string (retro_name))); | |
4242 | } | |
b8da0ad1 | 4243 | else if (q.has_function_num || q.has_statement_num) |
db520b00 FCE |
4244 | { |
4245 | Dwarf_Addr retro_addr; | |
4246 | if (q.has_function_num) | |
4247 | retro_addr = q.function_num_val; | |
4248 | else | |
4249 | retro_addr = q.statement_num_val; | |
db520b00 FCE |
4250 | comps.push_back (new probe_point::component |
4251 | (fn_or_stmt, | |
9ea68eb9 | 4252 | new literal_number(retro_addr, true))); |
37ebca01 FCE |
4253 | |
4254 | if (q.has_absolute) | |
4255 | comps.push_back (new probe_point::component (TOK_ABSOLUTE)); | |
a229fcd7 GH |
4256 | } |
4257 | ||
b8da0ad1 FCE |
4258 | if (q.has_call) |
4259 | comps.push_back (new probe_point::component(TOK_CALL)); | |
4bda987e SC |
4260 | if (q.has_exported) |
4261 | comps.push_back (new probe_point::component(TOK_EXPORTED)); | |
b8da0ad1 FCE |
4262 | if (q.has_inline) |
4263 | comps.push_back (new probe_point::component(TOK_INLINE)); | |
db520b00 | 4264 | if (has_return) |
b8da0ad1 FCE |
4265 | comps.push_back (new probe_point::component(TOK_RETURN)); |
4266 | if (has_maxactive) | |
4267 | comps.push_back (new probe_point::component | |
4268 | (TOK_MAXACTIVE, new literal_number(maxactive_val))); | |
d9b516ca | 4269 | |
5d23847d FCE |
4270 | // Overwrite it. |
4271 | this->sole_location()->components = comps; | |
2930abc7 FCE |
4272 | } |
4273 | ||
bd2b1e68 | 4274 | |
0a98fd42 | 4275 | void |
8c67c337 JS |
4276 | dwarf_derived_probe::saveargs(dwarf_query& q, Dwarf_Die* scope_die, |
4277 | Dwarf_Addr dwfl_addr) | |
0a98fd42 | 4278 | { |
9aa8ffce | 4279 | if (null_die(scope_die)) |
0a98fd42 | 4280 | return; |
0a98fd42 | 4281 | |
8c67c337 | 4282 | bool verbose = q.sess.verbose > 2; |
0a98fd42 | 4283 | |
8c67c337 | 4284 | if (verbose) |
b530b5b3 | 4285 | clog << _F("saveargs: examining '%s' (dieoffset: %#" PRIx64 ")\n", (dwarf_diename(scope_die)?: "unknown"), dwarf_dieoffset(scope_die)); |
0a98fd42 | 4286 | |
8c67c337 JS |
4287 | if (has_return) |
4288 | { | |
4289 | /* Only save the return value if it has a type. */ | |
4290 | string type_name; | |
4291 | Dwarf_Die type_die; | |
4292 | if (dwarf_attr_die (scope_die, DW_AT_type, &type_die) && | |
4293 | dwarf_type_name(&type_die, type_name)) | |
4294 | args.push_back("$return:"+type_name); | |
4295 | ||
4296 | else if (verbose) | |
b530b5b3 LB |
4297 | clog << _F("saveargs: failed to retrieve type name for return value (dieoffset: %s)\n", |
4298 | lex_cast_hex(dwarf_dieoffset(scope_die)).c_str()); | |
8c67c337 | 4299 | } |
d87623a1 | 4300 | |
0a98fd42 | 4301 | Dwarf_Die arg; |
4ef35696 JS |
4302 | vector<Dwarf_Die> scopes = q.dw.getscopes(scope_die); |
4303 | for (unsigned i = 0; i < scopes.size(); ++i) | |
4304 | { | |
4305 | if (dwarf_tag(&scopes[i]) == DW_TAG_compile_unit) | |
4306 | break; // we don't want file-level variables | |
4307 | if (dwarf_child (&scopes[i], &arg) == 0) | |
4308 | do | |
0a98fd42 | 4309 | { |
4ef35696 JS |
4310 | switch (dwarf_tag (&arg)) |
4311 | { | |
4312 | case DW_TAG_variable: | |
4313 | case DW_TAG_formal_parameter: | |
4314 | break; | |
0a98fd42 | 4315 | |
4ef35696 JS |
4316 | default: |
4317 | continue; | |
4318 | } | |
0a98fd42 | 4319 | |
4ef35696 JS |
4320 | /* Ignore this local if it has no name. */ |
4321 | const char *arg_name = dwarf_diename (&arg); | |
4322 | if (!arg_name) | |
8c67c337 JS |
4323 | { |
4324 | if (verbose) | |
b530b5b3 LB |
4325 | clog << _F("saveargs: failed to retrieve name for local (dieoffset: %s)\n", |
4326 | lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
8c67c337 JS |
4327 | continue; |
4328 | } | |
4ef35696 JS |
4329 | |
4330 | if (verbose) | |
b530b5b3 LB |
4331 | clog << _F("saveargs: finding location for local '%s' (dieoffset: %s)\n", |
4332 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
4ef35696 JS |
4333 | |
4334 | /* Ignore this local if it has no location (or not at this PC). */ | |
4335 | /* NB: It still may not be directly accessible, e.g. if it is an | |
4336 | * aggregate type, implicit_pointer, etc., but the user can later | |
4337 | * figure out how to access the interesting parts. */ | |
4338 | Dwarf_Attribute attr_mem; | |
4339 | if (!dwarf_attr_integrate (&arg, DW_AT_const_value, &attr_mem)) | |
4340 | { | |
4341 | Dwarf_Op *expr; | |
4342 | size_t len; | |
4343 | if (!dwarf_attr_integrate (&arg, DW_AT_location, &attr_mem)) | |
4344 | { | |
4345 | if (verbose) | |
b530b5b3 LB |
4346 | clog << _F("saveargs: failed to resolve the location for local '%s' (dieoffset: %s)\n", |
4347 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
4ef35696 JS |
4348 | continue; |
4349 | } | |
4350 | else if (!(dwarf_getlocation_addr(&attr_mem, dwfl_addr, &expr, | |
4351 | &len, 1) == 1 && len > 0)) | |
4352 | { | |
4353 | if (verbose) | |
b530b5b3 LB |
4354 | clog << _F("saveargs: local '%s' (dieoffset: %s) is not available at this address (%s)\n", |
4355 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str(), lex_cast_hex(dwfl_addr).c_str()); | |
4ef35696 JS |
4356 | continue; |
4357 | } | |
4358 | } | |
4359 | ||
4360 | /* Ignore this local if it has no type. */ | |
4361 | string type_name; | |
4362 | Dwarf_Die type_die; | |
4363 | if (!dwarf_attr_die (&arg, DW_AT_type, &type_die) || | |
4364 | !dwarf_type_name(&type_die, type_name)) | |
8c67c337 JS |
4365 | { |
4366 | if (verbose) | |
b530b5b3 LB |
4367 | clog << _F("saveargs: failed to retrieve type name for local '%s' (dieoffset: %s)\n", |
4368 | arg_name, lex_cast_hex(dwarf_dieoffset(&arg)).c_str()); | |
8c67c337 JS |
4369 | continue; |
4370 | } | |
8c67c337 | 4371 | |
4ef35696 JS |
4372 | /* This local looks good -- save it! */ |
4373 | args.push_back("$"+string(arg_name)+":"+type_name); | |
8c67c337 | 4374 | } |
4ef35696 JS |
4375 | while (dwarf_siblingof (&arg, &arg) == 0); |
4376 | } | |
0a98fd42 JS |
4377 | } |
4378 | ||
4379 | ||
4380 | void | |
d0bfd2ac | 4381 | dwarf_derived_probe::getargs(std::list<std::string> &arg_set) const |
0a98fd42 | 4382 | { |
d0bfd2ac | 4383 | arg_set.insert(arg_set.end(), args.begin(), args.end()); |
0a98fd42 JS |
4384 | } |
4385 | ||
4386 | ||
27dc09b1 | 4387 | void |
42e38653 | 4388 | dwarf_derived_probe::emit_privilege_assertion (translator_output* o) |
27dc09b1 DB |
4389 | { |
4390 | if (has_process) | |
4391 | { | |
4392 | // These probes are allowed for unprivileged users, but only in the | |
4393 | // context of processes which they own. | |
4394 | emit_process_owner_assertion (o); | |
4395 | return; | |
4396 | } | |
4397 | ||
4398 | // Other probes must contain the default assertion which aborts | |
4399 | // if executed by an unprivileged user. | |
42e38653 | 4400 | derived_probe::emit_privilege_assertion (o); |
27dc09b1 DB |
4401 | } |
4402 | ||
4403 | ||
4404 | void | |
4405 | dwarf_derived_probe::print_dupe_stamp(ostream& o) | |
4406 | { | |
4407 | if (has_process) | |
4408 | { | |
4409 | // These probes are allowed for unprivileged users, but only in the | |
4410 | // context of processes which they own. | |
4411 | print_dupe_stamp_unprivileged_process_owner (o); | |
4412 | return; | |
4413 | } | |
4414 | ||
4415 | // Other probes must contain the default dupe stamp | |
4416 | derived_probe::print_dupe_stamp (o); | |
4417 | } | |
4418 | ||
64211010 | 4419 | |
7a053d3b | 4420 | void |
20c6c071 | 4421 | dwarf_derived_probe::register_statement_variants(match_node * root, |
27dc09b1 | 4422 | dwarf_builder * dw, |
42e38653 | 4423 | privilege_t privilege) |
bd2b1e68 | 4424 | { |
27dc09b1 | 4425 | root |
42e38653 | 4426 | ->bind_privilege(privilege) |
27dc09b1 | 4427 | ->bind(dw); |
54efe513 GH |
4428 | } |
4429 | ||
7a053d3b | 4430 | void |
fd6602a0 | 4431 | dwarf_derived_probe::register_function_variants(match_node * root, |
27dc09b1 | 4432 | dwarf_builder * dw, |
42e38653 | 4433 | privilege_t privilege) |
2865d17a | 4434 | { |
27dc09b1 | 4435 | root |
42e38653 | 4436 | ->bind_privilege(privilege) |
27dc09b1 | 4437 | ->bind(dw); |
27dc09b1 | 4438 | root->bind(TOK_CALL) |
42e38653 | 4439 | ->bind_privilege(privilege) |
27dc09b1 | 4440 | ->bind(dw); |
4bda987e SC |
4441 | root->bind(TOK_EXPORTED) |
4442 | ->bind_privilege(privilege) | |
4443 | ->bind(dw); | |
27dc09b1 | 4444 | root->bind(TOK_RETURN) |
42e38653 | 4445 | ->bind_privilege(privilege) |
27dc09b1 | 4446 | ->bind(dw); |
1e035395 | 4447 | |
f6be7c06 DB |
4448 | // For process probes / uprobes, .maxactive() is unused. |
4449 | if (! pr_contains (privilege, pr_stapusr)) | |
1e035395 FCE |
4450 | { |
4451 | root->bind(TOK_RETURN) | |
1e035395 FCE |
4452 | ->bind_num(TOK_MAXACTIVE)->bind(dw); |
4453 | } | |
bd2b1e68 GH |
4454 | } |
4455 | ||
7a053d3b | 4456 | void |
27dc09b1 | 4457 | dwarf_derived_probe::register_function_and_statement_variants( |
440d9b00 | 4458 | systemtap_session& s, |
27dc09b1 DB |
4459 | match_node * root, |
4460 | dwarf_builder * dw, | |
42e38653 | 4461 | privilege_t privilege |
27dc09b1 | 4462 | ) |
bd2b1e68 GH |
4463 | { |
4464 | // Here we match 4 forms: | |
4465 | // | |
4466 | // .function("foo") | |
4467 | // .function(0xdeadbeef) | |
4468 | // .statement("foo") | |
4469 | // .statement(0xdeadbeef) | |
4470 | ||
440d9b00 | 4471 | match_node *fv_root = root->bind_str(TOK_FUNCTION); |
42e38653 | 4472 | register_function_variants(fv_root, dw, privilege); |
7f02ca94 | 4473 | // ROOT.function("STRING") always gets the .inline and .label variants. |
440d9b00 | 4474 | fv_root->bind(TOK_INLINE) |
42e38653 | 4475 | ->bind_privilege(privilege) |
440d9b00 | 4476 | ->bind(dw); |
7f02ca94 JS |
4477 | fv_root->bind_str(TOK_LABEL) |
4478 | ->bind_privilege(privilege) | |
440d9b00 DB |
4479 | ->bind(dw); |
4480 | ||
4481 | fv_root = root->bind_num(TOK_FUNCTION); | |
42e38653 | 4482 | register_function_variants(fv_root, dw, privilege); |
440d9b00 DB |
4483 | // ROOT.function(NUMBER).inline is deprecated in release 1.7 and removed thereafter. |
4484 | if (strverscmp(s.compatible.c_str(), "1.7") <= 0) | |
4485 | { | |
4486 | fv_root->bind(TOK_INLINE) | |
42e38653 | 4487 | ->bind_privilege(privilege) |
440d9b00 DB |
4488 | ->bind(dw); |
4489 | } | |
4490 | ||
42e38653 DB |
4491 | register_statement_variants(root->bind_str(TOK_STATEMENT), dw, privilege); |
4492 | register_statement_variants(root->bind_num(TOK_STATEMENT), dw, privilege); | |
bd2b1e68 GH |
4493 | } |
4494 | ||
b1615c74 JS |
4495 | void |
4496 | dwarf_derived_probe::register_sdt_variants(systemtap_session& s, | |
4497 | match_node * root, | |
4498 | dwarf_builder * dw) | |
4499 | { | |
4500 | root->bind_str(TOK_MARK) | |
f66bb29a | 4501 | ->bind_privilege(pr_all) |
b1615c74 JS |
4502 | ->bind(dw); |
4503 | root->bind_str(TOK_PROVIDER)->bind_str(TOK_MARK) | |
f66bb29a | 4504 | ->bind_privilege(pr_all) |
b1615c74 JS |
4505 | ->bind(dw); |
4506 | } | |
4507 | ||
4508 | void | |
4509 | dwarf_derived_probe::register_plt_variants(systemtap_session& s, | |
4510 | match_node * root, | |
4511 | dwarf_builder * dw) | |
4512 | { | |
4513 | root->bind(TOK_PLT) | |
f66bb29a | 4514 | ->bind_privilege(pr_all) |
b1615c74 JS |
4515 | ->bind(dw); |
4516 | root->bind_str(TOK_PLT) | |
f66bb29a | 4517 | ->bind_privilege(pr_all) |
b1615c74 JS |
4518 | ->bind(dw); |
4519 | root->bind(TOK_PLT)->bind_num(TOK_STATEMENT) | |
f66bb29a | 4520 | ->bind_privilege(pr_all) |
b1615c74 JS |
4521 | ->bind(dw); |
4522 | root->bind_str(TOK_PLT)->bind_num(TOK_STATEMENT) | |
f66bb29a | 4523 | ->bind_privilege(pr_all) |
b1615c74 | 4524 | ->bind(dw); |
bd2b1e68 GH |
4525 | } |
4526 | ||
4527 | void | |
c4ce66a1 | 4528 | dwarf_derived_probe::register_patterns(systemtap_session& s) |
bd2b1e68 | 4529 | { |
c4ce66a1 | 4530 | match_node* root = s.pattern_root; |
bd2b1e68 GH |
4531 | dwarf_builder *dw = new dwarf_builder(); |
4532 | ||
c4ce66a1 JS |
4533 | update_visitor *filter = new dwarf_cast_expanding_visitor(s, *dw); |
4534 | s.code_filters.push_back(filter); | |
4535 | ||
73f52eb4 DB |
4536 | register_function_and_statement_variants(s, root->bind(TOK_KERNEL), dw, pr_privileged); |
4537 | register_function_and_statement_variants(s, root->bind_str(TOK_MODULE), dw, pr_privileged); | |
27dc09b1 DB |
4538 | root->bind(TOK_KERNEL)->bind_num(TOK_STATEMENT)->bind(TOK_ABSOLUTE) |
4539 | ->bind(dw); | |
2cab6244 | 4540 | |
7f02ca94 JS |
4541 | match_node* uprobes[] = { |
4542 | root->bind(TOK_PROCESS), | |
4543 | root->bind_str(TOK_PROCESS), | |
4544 | root->bind(TOK_PROCESS)->bind_str(TOK_LIBRARY), | |
4545 | root->bind_str(TOK_PROCESS)->bind_str(TOK_LIBRARY), | |
4546 | }; | |
4547 | for (size_t i = 0; i < sizeof(uprobes) / sizeof(*uprobes); ++i) | |
4548 | { | |
f66bb29a | 4549 | register_function_and_statement_variants(s, uprobes[i], dw, pr_all); |
7f02ca94 JS |
4550 | register_sdt_variants(s, uprobes[i], dw); |
4551 | register_plt_variants(s, uprobes[i], dw); | |
4552 | } | |
bd2b1e68 GH |
4553 | } |
4554 | ||
9020300d FCE |
4555 | void |
4556 | dwarf_derived_probe::emit_probe_local_init(translator_output * o) | |
4557 | { | |
b95e2b79 MH |
4558 | if (access_vars) |
4559 | { | |
4560 | // if accessing $variables, emit bsp cache setup for speeding up | |
d4670309 | 4561 | o->newline() << "#if defined __ia64__"; |
d9aed31e | 4562 | o->newline() << "bspcache(c->unwaddr, c->kregs);"; |
d4670309 | 4563 | o->newline() << "#endif"; |
b95e2b79 | 4564 | } |
9020300d | 4565 | } |
2930abc7 | 4566 | |
b20febf3 | 4567 | // ------------------------------------------------------------------------ |
46b84a80 DS |
4568 | |
4569 | void | |
b20febf3 | 4570 | dwarf_derived_probe_group::enroll (dwarf_derived_probe* p) |
46b84a80 | 4571 | { |
62f52bb0 JS |
4572 | if (p->sdt_semaphore_addr != 0) |
4573 | has_semaphores = true; | |
b20febf3 | 4574 | probes_by_module.insert (make_pair (p->module, p)); |
b8da0ad1 FCE |
4575 | |
4576 | // XXX: probes put at the same address should all share a | |
4577 | // single kprobe/kretprobe, and have their handlers executed | |
4578 | // sequentially. | |
b55bc428 FCE |
4579 | } |
4580 | ||
7a053d3b | 4581 | void |
775d51e5 | 4582 | dwarf_derived_probe_group::emit_module_decls (systemtap_session& s) |
ec4373ff | 4583 | { |
b20febf3 | 4584 | if (probes_by_module.empty()) return; |
2930abc7 | 4585 | |
775d51e5 DS |
4586 | s.op->newline() << "/* ---- dwarf probes ---- */"; |
4587 | ||
4588 | // Warn of misconfigured kernels | |
f41595cc FCE |
4589 | s.op->newline() << "#if ! defined(CONFIG_KPROBES)"; |
4590 | s.op->newline() << "#error \"Need CONFIG_KPROBES!\""; | |
4591 | s.op->newline() << "#endif"; | |
775d51e5 | 4592 | s.op->newline(); |
f41595cc | 4593 | |
f07c3b68 | 4594 | s.op->newline() << "#ifndef KRETACTIVE"; |
1ee6b5fc | 4595 | s.op->newline() << "#define KRETACTIVE (max(15,6*(int)num_possible_cpus()))"; |
f07c3b68 FCE |
4596 | s.op->newline() << "#endif"; |
4597 | ||
14cf7e42 SC |
4598 | // Forward decls |
4599 | s.op->newline() << "#include \"kprobes-common.h\""; | |
4600 | ||
b20febf3 FCE |
4601 | // Forward declare the master entry functions |
4602 | s.op->newline() << "static int enter_kprobe_probe (struct kprobe *inst,"; | |
4603 | s.op->line() << " struct pt_regs *regs);"; | |
4604 | s.op->newline() << "static int enter_kretprobe_probe (struct kretprobe_instance *inst,"; | |
4605 | s.op->line() << " struct pt_regs *regs);"; | |
4606 | ||
42cb22bd MH |
4607 | // Emit an array of kprobe/kretprobe pointers |
4608 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
4609 | s.op->newline() << "static void * stap_unreg_kprobes[" << probes_by_module.size() << "];"; | |
4610 | s.op->newline() << "#endif"; | |
4611 | ||
b20febf3 | 4612 | // Emit the actual probe list. |
606fd9c8 FCE |
4613 | |
4614 | // NB: we used to plop a union { struct kprobe; struct kretprobe } into | |
4615 | // struct stap_dwarf_probe, but it being initialized data makes it add | |
4616 | // hundreds of bytes of padding per stap_dwarf_probe. (PR5673) | |
14cf7e42 | 4617 | s.op->newline() << "static struct stap_dwarf_kprobe stap_dwarf_kprobes[" << probes_by_module.size() << "];"; |
606fd9c8 FCE |
4618 | // NB: bss! |
4619 | ||
4c2732a1 | 4620 | s.op->newline() << "static struct stap_dwarf_probe {"; |
b0986e7a DS |
4621 | s.op->newline(1) << "const unsigned return_p:1;"; |
4622 | s.op->newline() << "const unsigned maxactive_p:1;"; | |
b350f56b | 4623 | s.op->newline() << "const unsigned optional_p:1;"; |
b20febf3 | 4624 | s.op->newline() << "unsigned registered_p:1;"; |
b0986e7a | 4625 | s.op->newline() << "const unsigned short maxactive_val;"; |
606fd9c8 | 4626 | |
af234c40 JS |
4627 | // data saved in the kretprobe_instance packet |
4628 | s.op->newline() << "const unsigned short saved_longs;"; | |
4629 | s.op->newline() << "const unsigned short saved_strings;"; | |
4630 | ||
faea5e16 | 4631 | // Let's find some stats for the embedded strings. Maybe they |
606fd9c8 FCE |
4632 | // are small and uniform enough to justify putting char[MAX]'s into |
4633 | // the array instead of relocated char*'s. | |
faea5e16 JS |
4634 | size_t module_name_max = 0, section_name_max = 0; |
4635 | size_t module_name_tot = 0, section_name_tot = 0; | |
606fd9c8 FCE |
4636 | size_t all_name_cnt = probes_by_module.size(); // for average |
4637 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) | |
4638 | { | |
4639 | dwarf_derived_probe* p = it->second; | |
4640 | #define DOIT(var,expr) do { \ | |
4641 | size_t var##_size = (expr) + 1; \ | |
4642 | var##_max = max (var##_max, var##_size); \ | |
4643 | var##_tot += var##_size; } while (0) | |
4644 | DOIT(module_name, p->module.size()); | |
4645 | DOIT(section_name, p->section.size()); | |
606fd9c8 FCE |
4646 | #undef DOIT |
4647 | } | |
4648 | ||
4649 | // Decide whether it's worthwhile to use char[] or char* by comparing | |
4650 | // the amount of average waste (max - avg) to the relocation data size | |
4651 | // (3 native long words). | |
4652 | #define CALCIT(var) \ | |
4653 | if ((var##_name_max-(var##_name_tot/all_name_cnt)) < (3 * sizeof(void*))) \ | |
4654 | { \ | |
4655 | s.op->newline() << "const char " << #var << "[" << var##_name_max << "];"; \ | |
4656 | if (s.verbose > 2) clog << "stap_dwarf_probe " << #var \ | |
4657 | << "[" << var##_name_max << "]" << endl; \ | |
4658 | } \ | |
4659 | else \ | |
4660 | { \ | |
b0986e7a | 4661 | s.op->newline() << "const char * const " << #var << ";"; \ |
606fd9c8 FCE |
4662 | if (s.verbose > 2) clog << "stap_dwarf_probe *" << #var << endl; \ |
4663 | } | |
4664 | ||
4665 | CALCIT(module); | |
4666 | CALCIT(section); | |
e6fe60e7 | 4667 | #undef CALCIT |
606fd9c8 | 4668 | |
b0986e7a | 4669 | s.op->newline() << "const unsigned long address;"; |
26e63673 | 4670 | s.op->newline() << "struct stap_probe * const probe;"; |
c87ae2c1 | 4671 | s.op->newline() << "struct stap_probe * const entry_probe;"; |
62f52bb0 JS |
4672 | if (has_semaphores) |
4673 | { | |
4674 | s.op->newline() << "const unsigned long sdt_sem_offset;"; | |
4675 | s.op->newline() << "unsigned long sdt_sem_address;"; | |
4676 | s.op->newline() << "struct task_struct *tsk;"; | |
4677 | s.op->newline() << "const char *pathname;"; | |
4678 | s.op->newline() << "struct stap_task_finder_target finder;"; | |
4679 | } | |
b20febf3 FCE |
4680 | s.op->newline(-1) << "} stap_dwarf_probes[] = {"; |
4681 | s.op->indent(1); | |
4682 | ||
4683 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) | |
2930abc7 | 4684 | { |
b20febf3 FCE |
4685 | dwarf_derived_probe* p = it->second; |
4686 | s.op->newline() << "{"; | |
4687 | if (p->has_return) | |
4688 | s.op->line() << " .return_p=1,"; | |
c9bad430 | 4689 | if (p->has_maxactive) |
606fd9c8 FCE |
4690 | { |
4691 | s.op->line() << " .maxactive_p=1,"; | |
4692 | assert (p->maxactive_val >= 0 && p->maxactive_val <= USHRT_MAX); | |
4693 | s.op->line() << " .maxactive_val=" << p->maxactive_val << ","; | |
4694 | } | |
af234c40 JS |
4695 | if (p->saved_longs || p->saved_strings) |
4696 | { | |
4697 | if (p->saved_longs) | |
4698 | s.op->line() << " .saved_longs=" << p->saved_longs << ","; | |
4699 | if (p->saved_strings) | |
4700 | s.op->line() << " .saved_strings=" << p->saved_strings << ","; | |
4701 | if (p->entry_handler) | |
c87ae2c1 | 4702 | s.op->line() << " .entry_probe=" << common_probe_init (p->entry_handler) << ","; |
af234c40 | 4703 | } |
b350f56b JS |
4704 | if (p->locations[0]->optional) |
4705 | s.op->line() << " .optional_p=1,"; | |
dc38c256 | 4706 | s.op->line() << " .address=(unsigned long)0x" << hex << p->addr << dec << "ULL,"; |
84048984 FCE |
4707 | s.op->line() << " .module=\"" << p->module << "\","; |
4708 | s.op->line() << " .section=\"" << p->section << "\","; | |
faea5e16 | 4709 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
b642c901 SC |
4710 | if (p->sdt_semaphore_addr != 0) |
4711 | { | |
4712 | s.op->line() << " .sdt_sem_offset=(unsigned long)0x" << hex << p->sdt_semaphore_addr << dec << "ULL,"; | |
4713 | s.op->line() << " .sdt_sem_address=0,"; | |
4714 | if (p->has_library) | |
4715 | { | |
4716 | s.op->line() << " .finder={"; | |
4717 | s.op->line() << " .pid=0,"; | |
4718 | s.op->line() << " .procname=\"" << p->user_path << "\","; | |
4719 | s.op->line() << " .mmap_callback=&stap_kprobe_mmap_found,"; | |
4720 | s.op->line() << " },"; | |
4721 | s.op->line() << " .pathname=\"" << p->user_lib << "\","; | |
4722 | } | |
4723 | else | |
4724 | { | |
4725 | s.op->line() << " .finder={"; | |
4726 | s.op->line() << " .pid=0,"; | |
4727 | s.op->line() << " .procname=\"" << p->user_path << "\","; | |
4728 | s.op->line() << " .callback=&stap_kprobe_process_found,"; | |
4729 | s.op->line() << " },"; | |
4730 | s.op->line() << " .pathname=\"" << p->user_path << "\","; | |
4731 | } | |
4732 | ||
4733 | } | |
b642c901 | 4734 | |
b20febf3 | 4735 | s.op->line() << " },"; |
2930abc7 | 4736 | } |
2930abc7 | 4737 | |
b20febf3 FCE |
4738 | s.op->newline(-1) << "};"; |
4739 | ||
4740 | // Emit the kprobes callback function | |
4741 | s.op->newline(); | |
4742 | s.op->newline() << "static int enter_kprobe_probe (struct kprobe *inst,"; | |
4743 | s.op->line() << " struct pt_regs *regs) {"; | |
606fd9c8 FCE |
4744 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS |
4745 | s.op->newline(1) << "int kprobe_idx = ((uintptr_t)inst-(uintptr_t)stap_dwarf_kprobes)/sizeof(struct stap_dwarf_kprobe);"; | |
4746 | // Check that the index is plausible | |
4747 | s.op->newline() << "struct stap_dwarf_probe *sdp = &stap_dwarf_probes["; | |
4748 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
4749 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
4750 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
4751 | s.op->line() << "];"; | |
6eefe942 MW |
4752 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->probe", |
4753 | "_STP_PROBE_HANDLER_KPROBE"); | |
d9aed31e | 4754 | s.op->newline() << "c->kregs = regs;"; |
6415ddde MW |
4755 | |
4756 | // Make it look like the IP is set as it wouldn't have been replaced | |
4757 | // by a breakpoint instruction when calling real probe handler. Reset | |
4758 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
4759 | s.op->newline() << "{"; | |
4760 | s.op->indent(1); | |
d9aed31e | 4761 | s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
259d54c0 | 4762 | s.op->newline() << "SET_REG_IP(regs, (unsigned long) inst->addr);"; |
26e63673 | 4763 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
259d54c0 | 4764 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
4765 | s.op->newline(-1) << "}"; |
4766 | ||
7baf48e9 | 4767 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
b20febf3 FCE |
4768 | s.op->newline() << "return 0;"; |
4769 | s.op->newline(-1) << "}"; | |
4770 | ||
4771 | // Same for kretprobes | |
4772 | s.op->newline(); | |
af234c40 JS |
4773 | s.op->newline() << "static int enter_kretprobe_common (struct kretprobe_instance *inst,"; |
4774 | s.op->line() << " struct pt_regs *regs, int entry) {"; | |
b20febf3 | 4775 | s.op->newline(1) << "struct kretprobe *krp = inst->rp;"; |
606fd9c8 FCE |
4776 | |
4777 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS | |
a36378d7 | 4778 | s.op->newline() << "int kprobe_idx = ((uintptr_t)krp-(uintptr_t)stap_dwarf_kprobes)/sizeof(struct stap_dwarf_kprobe);"; |
606fd9c8 FCE |
4779 | // Check that the index is plausible |
4780 | s.op->newline() << "struct stap_dwarf_probe *sdp = &stap_dwarf_probes["; | |
4781 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
4782 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
4783 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
4784 | s.op->line() << "];"; | |
4785 | ||
c87ae2c1 JS |
4786 | s.op->newline() << "struct stap_probe *sp = entry ? sdp->entry_probe : sdp->probe;"; |
4787 | s.op->newline() << "if (sp) {"; | |
4788 | s.op->indent(1); | |
6eefe942 MW |
4789 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sp", |
4790 | "_STP_PROBE_HANDLER_KRETPROBE"); | |
d9aed31e | 4791 | s.op->newline() << "c->kregs = regs;"; |
af234c40 JS |
4792 | |
4793 | // for assisting runtime's backtrace logic and accessing kretprobe data packets | |
6dceb5c9 MW |
4794 | s.op->newline() << "c->ips.krp.pi = inst;"; |
4795 | s.op->newline() << "c->ips.krp.pi_longs = sdp->saved_longs;"; | |
6415ddde MW |
4796 | |
4797 | // Make it look like the IP is set as it wouldn't have been replaced | |
4798 | // by a breakpoint instruction when calling real probe handler. Reset | |
4799 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
4800 | s.op->newline() << "{"; | |
d9aed31e | 4801 | s.op->newline(1) << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
c87ae2c1 JS |
4802 | s.op->newline() << "if (entry)"; |
4803 | s.op->newline(1) << "SET_REG_IP(regs, (unsigned long) inst->rp->kp.addr);"; | |
4804 | s.op->newline(-1) << "else"; | |
4805 | s.op->newline(1) << "SET_REG_IP(regs, (unsigned long)inst->ret_addr);"; | |
4806 | s.op->newline(-1) << "(sp->ph) (c);"; | |
259d54c0 | 4807 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
4808 | s.op->newline(-1) << "}"; |
4809 | ||
7baf48e9 | 4810 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
c87ae2c1 | 4811 | s.op->newline(-1) << "}"; |
b20febf3 FCE |
4812 | s.op->newline() << "return 0;"; |
4813 | s.op->newline(-1) << "}"; | |
af234c40 JS |
4814 | |
4815 | s.op->newline(); | |
4816 | s.op->newline() << "static int enter_kretprobe_probe (struct kretprobe_instance *inst,"; | |
4817 | s.op->line() << " struct pt_regs *regs) {"; | |
4818 | s.op->newline(1) << "return enter_kretprobe_common(inst, regs, 0);"; | |
4819 | s.op->newline(-1) << "}"; | |
4820 | ||
4821 | s.op->newline(); | |
4822 | s.op->newline() << "static int enter_kretprobe_entry_probe (struct kretprobe_instance *inst,"; | |
4823 | s.op->line() << " struct pt_regs *regs) {"; | |
4824 | s.op->newline(1) << "return enter_kretprobe_common(inst, regs, 1);"; | |
4825 | s.op->newline(-1) << "}"; | |
b642c901 | 4826 | |
14cf7e42 | 4827 | s.op->newline(); |
62f52bb0 JS |
4828 | if (has_semaphores) |
4829 | s.op->newline() << "#define KPROBES_TASK_FINDER 1"; | |
14cf7e42 SC |
4830 | s.op->newline() << "#include \"kprobes-common.c\""; |
4831 | s.op->newline(); | |
20c6c071 | 4832 | } |
ec4373ff | 4833 | |
20c6c071 | 4834 | |
dc38c0ae | 4835 | void |
b20febf3 FCE |
4836 | dwarf_derived_probe_group::emit_module_init (systemtap_session& s) |
4837 | { | |
62f52bb0 | 4838 | if (has_semaphores) // Ignore if there are no semaphores |
b642c901 SC |
4839 | { |
4840 | s.op->newline() << "for (i=0; i<ARRAY_SIZE(stap_dwarf_probes); i++) {"; | |
4841 | s.op->newline(1) << "int rc;"; | |
4842 | s.op->newline() << "struct stap_dwarf_probe *p = &stap_dwarf_probes[i];"; | |
26e63673 | 4843 | s.op->newline() << "probe_point = p->probe->pp;"; // for error messages |
b642c901 SC |
4844 | s.op->newline() << "if (p->sdt_sem_offset) {"; |
4845 | s.op->newline(1) << "rc = stap_register_task_finder_target(&p->finder);"; | |
4846 | s.op->newline(-1) << "}"; | |
4847 | s.op->newline() << "if (rc) break;"; | |
4848 | s.op->newline(-1) << "}"; | |
4849 | } | |
4850 | ||
b20febf3 FCE |
4851 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
4852 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
a36378d7 | 4853 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; |
a049e342 | 4854 | s.op->newline() << "unsigned long relocated_addr = _stp_kmodule_relocate (sdp->module, sdp->section, sdp->address);"; |
b20febf3 | 4855 | s.op->newline() << "if (relocated_addr == 0) continue;"; // quietly; assume module is absent |
26e63673 | 4856 | s.op->newline() << "probe_point = sdp->probe->pp;"; // for error messages |
b20febf3 | 4857 | s.op->newline() << "if (sdp->return_p) {"; |
606fd9c8 | 4858 | s.op->newline(1) << "kp->u.krp.kp.addr = (void *) relocated_addr;"; |
c9bad430 | 4859 | s.op->newline() << "if (sdp->maxactive_p) {"; |
606fd9c8 | 4860 | s.op->newline(1) << "kp->u.krp.maxactive = sdp->maxactive_val;"; |
c9bad430 | 4861 | s.op->newline(-1) << "} else {"; |
f07c3b68 | 4862 | s.op->newline(1) << "kp->u.krp.maxactive = KRETACTIVE;"; |
c9bad430 | 4863 | s.op->newline(-1) << "}"; |
606fd9c8 | 4864 | s.op->newline() << "kp->u.krp.handler = &enter_kretprobe_probe;"; |
af234c40 | 4865 | s.op->newline() << "#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)"; |
c87ae2c1 | 4866 | s.op->newline() << "if (sdp->entry_probe) {"; |
af234c40 JS |
4867 | s.op->newline(1) << "kp->u.krp.entry_handler = &enter_kretprobe_entry_probe;"; |
4868 | s.op->newline() << "kp->u.krp.data_size = sdp->saved_longs * sizeof(int64_t) + "; | |
4869 | s.op->newline() << " sdp->saved_strings * MAXSTRINGLEN;"; | |
4870 | s.op->newline(-1) << "}"; | |
4871 | s.op->newline() << "#endif"; | |
e4cb375f MH |
4872 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 |
4873 | s.op->newline() << "#ifdef __ia64__"; | |
4874 | s.op->newline() << "kp->dummy.addr = kp->u.krp.kp.addr;"; | |
4875 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
4876 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
4877 | s.op->newline() << "if (rc == 0) {"; | |
4878 | s.op->newline(1) << "rc = register_kretprobe (& kp->u.krp);"; | |
4879 | s.op->newline() << "if (rc != 0)"; | |
4880 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
4881 | s.op->newline(-2) << "}"; | |
4882 | s.op->newline() << "#else"; | |
606fd9c8 | 4883 | s.op->newline() << "rc = register_kretprobe (& kp->u.krp);"; |
e4cb375f | 4884 | s.op->newline() << "#endif"; |
b20febf3 | 4885 | s.op->newline(-1) << "} else {"; |
e4cb375f | 4886 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 |
606fd9c8 FCE |
4887 | s.op->newline(1) << "kp->u.kp.addr = (void *) relocated_addr;"; |
4888 | s.op->newline() << "kp->u.kp.pre_handler = &enter_kprobe_probe;"; | |
e4cb375f MH |
4889 | s.op->newline() << "#ifdef __ia64__"; |
4890 | s.op->newline() << "kp->dummy.addr = kp->u.kp.addr;"; | |
4891 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
4892 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
4893 | s.op->newline() << "if (rc == 0) {"; | |
4894 | s.op->newline(1) << "rc = register_kprobe (& kp->u.kp);"; | |
4895 | s.op->newline() << "if (rc != 0)"; | |
4896 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
4897 | s.op->newline(-2) << "}"; | |
4898 | s.op->newline() << "#else"; | |
606fd9c8 | 4899 | s.op->newline() << "rc = register_kprobe (& kp->u.kp);"; |
e4cb375f | 4900 | s.op->newline() << "#endif"; |
b20febf3 | 4901 | s.op->newline(-1) << "}"; |
9063462a FCE |
4902 | s.op->newline() << "if (rc) {"; // PR6749: tolerate a failed register_*probe. |
4903 | s.op->newline(1) << "sdp->registered_p = 0;"; | |
b350f56b | 4904 | s.op->newline() << "if (!sdp->optional_p)"; |
50b6acf7 | 4905 | s.op->newline(1) << "_stp_warn (\"probe %s (address 0x%lx) registration error (rc %d)\", probe_point, (unsigned long) relocated_addr, rc);"; |
b350f56b | 4906 | s.op->newline(-1) << "rc = 0;"; // continue with other probes |
9063462a FCE |
4907 | // XXX: shall we increment numskipped? |
4908 | s.op->newline(-1) << "}"; | |
4909 | ||
4910 | #if 0 /* pre PR 6749; XXX consider making an option */ | |
c48cb0cc | 4911 | s.op->newline(1) << "for (j=i-1; j>=0; j--) {"; // partial rollback |
b20febf3 | 4912 | s.op->newline(1) << "struct stap_dwarf_probe *sdp2 = & stap_dwarf_probes[j];"; |
606fd9c8 FCE |
4913 | s.op->newline() << "struct stap_dwarf_kprobe *kp2 = & stap_dwarf_kprobes[j];"; |
4914 | s.op->newline() << "if (sdp2->return_p) unregister_kretprobe (&kp2->u.krp);"; | |
4915 | s.op->newline() << "else unregister_kprobe (&kp2->u.kp);"; | |
e4cb375f MH |
4916 | s.op->newline() << "#ifdef __ia64__"; |
4917 | s.op->newline() << "unregister_kprobe (&kp2->dummy);"; | |
4918 | s.op->newline() << "#endif"; | |
c48cb0cc FCE |
4919 | // NB: we don't have to clear sdp2->registered_p, since the module_exit code is |
4920 | // not run for this early-abort case. | |
4921 | s.op->newline(-1) << "}"; | |
4922 | s.op->newline() << "break;"; // don't attempt to register any more probes | |
b20febf3 | 4923 | s.op->newline(-1) << "}"; |
9063462a FCE |
4924 | #endif |
4925 | ||
b20febf3 FCE |
4926 | s.op->newline() << "else sdp->registered_p = 1;"; |
4927 | s.op->newline(-1) << "}"; // for loop | |
dc38c0ae DS |
4928 | } |
4929 | ||
4930 | ||
b4be7cbc FCE |
4931 | void |
4932 | dwarf_derived_probe_group::emit_module_refresh (systemtap_session& s) | |
4933 | { | |
4934 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
4935 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
4936 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
4937 | s.op->newline() << "unsigned long relocated_addr = _stp_kmodule_relocate (sdp->module, sdp->section, sdp->address);"; | |
4938 | s.op->newline() << "int rc;"; | |
4939 | ||
4940 | // new module arrived? | |
4941 | s.op->newline() << "if (sdp->registered_p == 0 && relocated_addr != 0) {"; | |
4942 | s.op->newline(1) << "if (sdp->return_p) {"; | |
4943 | s.op->newline(1) << "kp->u.krp.kp.addr = (void *) relocated_addr;"; | |
4944 | s.op->newline() << "if (sdp->maxactive_p) {"; | |
4945 | s.op->newline(1) << "kp->u.krp.maxactive = sdp->maxactive_val;"; | |
4946 | s.op->newline(-1) << "} else {"; | |
4947 | s.op->newline(1) << "kp->u.krp.maxactive = KRETACTIVE;"; | |
4948 | s.op->newline(-1) << "}"; | |
4949 | s.op->newline() << "kp->u.krp.handler = &enter_kretprobe_probe;"; | |
4950 | s.op->newline() << "#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)"; | |
4951 | s.op->newline() << "if (sdp->entry_probe) {"; | |
4952 | s.op->newline(1) << "kp->u.krp.entry_handler = &enter_kretprobe_entry_probe;"; | |
4953 | s.op->newline() << "kp->u.krp.data_size = sdp->saved_longs * sizeof(int64_t) + "; | |
4954 | s.op->newline() << " sdp->saved_strings * MAXSTRINGLEN;"; | |
4955 | s.op->newline(-1) << "}"; | |
4956 | s.op->newline() << "#endif"; | |
4957 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 | |
4958 | s.op->newline() << "#ifdef __ia64__"; | |
4959 | s.op->newline() << "kp->dummy.addr = kp->u.krp.kp.addr;"; | |
4960 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
4961 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
4962 | s.op->newline() << "if (rc == 0) {"; | |
4963 | s.op->newline(1) << "rc = register_kretprobe (& kp->u.krp);"; | |
4964 | s.op->newline() << "if (rc != 0)"; | |
4965 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
4966 | s.op->newline(-2) << "}"; | |
4967 | s.op->newline() << "#else"; | |
4968 | s.op->newline() << "rc = register_kretprobe (& kp->u.krp);"; | |
4969 | s.op->newline() << "#endif"; | |
4970 | s.op->newline(-1) << "} else {"; | |
4971 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 | |
4972 | s.op->newline(1) << "kp->u.kp.addr = (void *) relocated_addr;"; | |
4973 | s.op->newline() << "kp->u.kp.pre_handler = &enter_kprobe_probe;"; | |
4974 | s.op->newline() << "#ifdef __ia64__"; | |
4975 | s.op->newline() << "kp->dummy.addr = kp->u.kp.addr;"; | |
4976 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; | |
4977 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; | |
4978 | s.op->newline() << "if (rc == 0) {"; | |
4979 | s.op->newline(1) << "rc = register_kprobe (& kp->u.kp);"; | |
4980 | s.op->newline() << "if (rc != 0)"; | |
4981 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
4982 | s.op->newline(-2) << "}"; | |
4983 | s.op->newline() << "#else"; | |
4984 | s.op->newline() << "rc = register_kprobe (& kp->u.kp);"; | |
4985 | s.op->newline() << "#endif"; | |
4986 | s.op->newline(-1) << "}"; | |
4987 | s.op->newline() << "if (rc == 0) sdp->registered_p = 1;"; | |
4988 | ||
4989 | // old module disappeared? | |
4990 | s.op->newline(-1) << "} else if (sdp->registered_p == 1 && relocated_addr == 0) {"; | |
4991 | s.op->newline(1) << "if (sdp->return_p) {"; | |
4992 | s.op->newline(1) << "unregister_kretprobe (&kp->u.krp);"; | |
4993 | s.op->newline() << "atomic_add (kp->u.krp.nmissed, & skipped_count);"; | |
4994 | s.op->newline() << "#ifdef STP_TIMING"; | |
4995 | s.op->newline() << "if (kp->u.krp.nmissed)"; | |
4996 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/1 on '%s': %d\\n\", sdp->probe->pp, kp->u.krp.nmissed);"; | |
4997 | s.op->newline(-1) << "#endif"; | |
4998 | s.op->newline() << "atomic_add (kp->u.krp.kp.nmissed, & skipped_count);"; | |
4999 | s.op->newline() << "#ifdef STP_TIMING"; | |
5000 | s.op->newline() << "if (kp->u.krp.kp.nmissed)"; | |
5001 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/2 on '%s': %lu\\n\", sdp->probe->pp, kp->u.krp.kp.nmissed);"; | |
5002 | s.op->newline(-1) << "#endif"; | |
5003 | s.op->newline(-1) << "} else {"; | |
5004 | s.op->newline(1) << "unregister_kprobe (&kp->u.kp);"; | |
5005 | s.op->newline() << "atomic_add (kp->u.kp.nmissed, & skipped_count);"; | |
5006 | s.op->newline() << "#ifdef STP_TIMING"; | |
5007 | s.op->newline() << "if (kp->u.kp.nmissed)"; | |
5008 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kprobe on '%s': %lu\\n\", sdp->probe->pp, kp->u.kp.nmissed);"; | |
5009 | s.op->newline(-1) << "#endif"; | |
5010 | s.op->newline(-1) << "}"; | |
5011 | s.op->newline() << "#if defined(__ia64__)"; | |
5012 | s.op->newline() << "unregister_kprobe (&kp->dummy);"; | |
5013 | s.op->newline() << "#endif"; | |
5014 | s.op->newline() << "sdp->registered_p = 0;"; | |
5015 | s.op->newline(-1) << "}"; | |
5016 | ||
5017 | s.op->newline(-1) << "}"; // for loop | |
5018 | } | |
5019 | ||
5020 | ||
5021 | ||
5022 | ||
46b84a80 | 5023 | void |
b20febf3 | 5024 | dwarf_derived_probe_group::emit_module_exit (systemtap_session& s) |
46b84a80 | 5025 | { |
62f52bb0 JS |
5026 | if (has_semaphores) |
5027 | { | |
5028 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5029 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5030 | s.op->newline() << "unsigned short sdt_semaphore = 0;"; // NB: fixed size | |
5031 | s.op->newline() << "if (sdp->sdt_sem_address && __access_process_vm_noflush (sdp->tsk, sdp->sdt_sem_address, &sdt_semaphore, sizeof (sdt_semaphore), 0)) {"; | |
5032 | s.op->newline(1) << "sdt_semaphore --;"; | |
5033 | s.op->newline() << "__access_process_vm_noflush (sdp->tsk, sdp->sdt_sem_address, &sdt_semaphore, sizeof (sdt_semaphore), 1);"; | |
5034 | s.op->newline(-1) << "}"; | |
5035 | s.op->newline(-1) << "}"; | |
5036 | } | |
b642c901 | 5037 | |
42cb22bd MH |
5038 | //Unregister kprobes by batch interfaces. |
5039 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
5040 | s.op->newline() << "j = 0;"; | |
5041 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5042 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5043 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5044 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
5045 | s.op->newline() << "if (!sdp->return_p)"; | |
5046 | s.op->newline(1) << "stap_unreg_kprobes[j++] = &kp->u.kp;"; | |
5047 | s.op->newline(-2) << "}"; | |
5048 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes, j);"; | |
5049 | s.op->newline() << "j = 0;"; | |
5050 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5051 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5052 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5053 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
5054 | s.op->newline() << "if (sdp->return_p)"; | |
5055 | s.op->newline(1) << "stap_unreg_kprobes[j++] = &kp->u.krp;"; | |
5056 | s.op->newline(-2) << "}"; | |
5057 | s.op->newline() << "unregister_kretprobes((struct kretprobe **)stap_unreg_kprobes, j);"; | |
e4cb375f MH |
5058 | s.op->newline() << "#ifdef __ia64__"; |
5059 | s.op->newline() << "j = 0;"; | |
5060 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
5061 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
5062 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; | |
5063 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
5064 | s.op->newline() << "stap_unreg_kprobes[j++] = &kp->dummy;"; | |
5065 | s.op->newline(-1) << "}"; | |
5066 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes, j);"; | |
5067 | s.op->newline() << "#endif"; | |
42cb22bd MH |
5068 | s.op->newline() << "#endif"; |
5069 | ||
b20febf3 FCE |
5070 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
5071 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
a36378d7 | 5072 | s.op->newline() << "struct stap_dwarf_kprobe *kp = & stap_dwarf_kprobes[i];"; |
b20febf3 FCE |
5073 | s.op->newline() << "if (! sdp->registered_p) continue;"; |
5074 | s.op->newline() << "if (sdp->return_p) {"; | |
42cb22bd | 5075 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; |
606fd9c8 | 5076 | s.op->newline(1) << "unregister_kretprobe (&kp->u.krp);"; |
42cb22bd | 5077 | s.op->newline() << "#endif"; |
606fd9c8 | 5078 | s.op->newline() << "atomic_add (kp->u.krp.nmissed, & skipped_count);"; |
73209876 FCE |
5079 | s.op->newline() << "#ifdef STP_TIMING"; |
5080 | s.op->newline() << "if (kp->u.krp.nmissed)"; | |
26e63673 | 5081 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/1 on '%s': %d\\n\", sdp->probe->pp, kp->u.krp.nmissed);"; |
73209876 | 5082 | s.op->newline(-1) << "#endif"; |
606fd9c8 | 5083 | s.op->newline() << "atomic_add (kp->u.krp.kp.nmissed, & skipped_count);"; |
73209876 FCE |
5084 | s.op->newline() << "#ifdef STP_TIMING"; |
5085 | s.op->newline() << "if (kp->u.krp.kp.nmissed)"; | |
26e63673 | 5086 | 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 | 5087 | s.op->newline(-1) << "#endif"; |
557fb7a8 | 5088 | s.op->newline(-1) << "} else {"; |
42cb22bd | 5089 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; |
606fd9c8 | 5090 | s.op->newline(1) << "unregister_kprobe (&kp->u.kp);"; |
42cb22bd | 5091 | s.op->newline() << "#endif"; |
606fd9c8 | 5092 | s.op->newline() << "atomic_add (kp->u.kp.nmissed, & skipped_count);"; |
73209876 FCE |
5093 | s.op->newline() << "#ifdef STP_TIMING"; |
5094 | s.op->newline() << "if (kp->u.kp.nmissed)"; | |
26e63673 | 5095 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kprobe on '%s': %lu\\n\", sdp->probe->pp, kp->u.kp.nmissed);"; |
73209876 | 5096 | s.op->newline(-1) << "#endif"; |
b20febf3 | 5097 | s.op->newline(-1) << "}"; |
e4cb375f MH |
5098 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES) && defined(__ia64__)"; |
5099 | s.op->newline() << "unregister_kprobe (&kp->dummy);"; | |
5100 | s.op->newline() << "#endif"; | |
b20febf3 FCE |
5101 | s.op->newline() << "sdp->registered_p = 0;"; |
5102 | s.op->newline(-1) << "}"; | |
46b84a80 DS |
5103 | } |
5104 | ||
272c9036 WF |
5105 | static void sdt_v3_tokenize(const string& str, vector<string>& tokens) |
5106 | { | |
5107 | string::size_type pos; | |
5108 | string::size_type lastPos = str.find_first_not_of(" ", 0); | |
5109 | string::size_type nextAt = str.find("@", lastPos); | |
5110 | while (lastPos != string::npos) | |
5111 | { | |
5112 | pos = nextAt + 1; | |
5113 | nextAt = str.find("@", pos); | |
5114 | if (nextAt == string::npos) | |
5115 | pos = string::npos; | |
5116 | else | |
5117 | pos = str.rfind(" ", nextAt); | |
5118 | ||
5119 | tokens.push_back(str.substr(lastPos, pos - lastPos)); | |
5120 | lastPos = str.find_first_not_of(" ", pos); | |
5121 | } | |
5122 | } | |
8aabf152 FCE |
5123 | |
5124 | struct sdt_kprobe_var_expanding_visitor: public var_expanding_visitor | |
5125 | { | |
5126 | sdt_kprobe_var_expanding_visitor(const string & process_name, | |
5127 | const string & provider_name, | |
5128 | const string & probe_name, | |
5129 | const string & arg_string, | |
5130 | int arg_count): | |
5131 | process_name (process_name), provider_name (provider_name), probe_name (probe_name), | |
5132 | arg_count (arg_count) | |
5133 | { | |
5134 | tokenize(arg_string, arg_tokens, " "); | |
822a6a3d | 5135 | assert(arg_count <= 10); |
8aabf152 FCE |
5136 | } |
5137 | const string & process_name; | |
5138 | const string & provider_name; | |
5139 | const string & probe_name; | |
5140 | int arg_count; | |
5141 | vector<string> arg_tokens; | |
5142 | ||
5143 | void visit_target_symbol (target_symbol* e); | |
40a0c64e | 5144 | void visit_cast_op (cast_op* e); |
8aabf152 FCE |
5145 | }; |
5146 | ||
5147 | ||
aff5d390 | 5148 | struct sdt_uprobe_var_expanding_visitor: public var_expanding_visitor |
7a05f484 | 5149 | { |
ae1418f0 | 5150 | enum regwidths {QI, QIh, HI, SI, DI}; |
f83336a5 FCE |
5151 | sdt_uprobe_var_expanding_visitor(systemtap_session& s, |
5152 | int elf_machine, | |
5153 | const string & process_name, | |
a794dbeb | 5154 | const string & provider_name, |
aff5d390 | 5155 | const string & probe_name, |
71e5e13d | 5156 | stap_sdt_probe_type probe_type, |
aff5d390 | 5157 | const string & arg_string, |
8aabf152 | 5158 | int ac): |
332ba7e7 | 5159 | session (s), elf_machine (elf_machine), process_name (process_name), |
71e5e13d SC |
5160 | provider_name (provider_name), probe_name (probe_name), |
5161 | probe_type (probe_type), arg_count ((unsigned) ac) | |
a8ec7719 | 5162 | { |
f83336a5 FCE |
5163 | /* Register name mapping table depends on the elf machine of this particular |
5164 | probe target process/file, not upon the host. So we can't just | |
5165 | #ifdef _i686_ etc. */ | |
ae1418f0 FCE |
5166 | |
5167 | #define DRI(name,num,width) dwarf_regs[name]=make_pair(num,width) | |
f83336a5 | 5168 | if (elf_machine == EM_X86_64) { |
46a94997 SC |
5169 | DRI ("%rax", 0, DI); DRI ("%eax", 0, SI); DRI ("%ax", 0, HI); |
5170 | DRI ("%al", 0, QI); DRI ("%ah", 0, QIh); | |
5171 | DRI ("%rdx", 1, DI); DRI ("%edx", 1, SI); DRI ("%dx", 1, HI); | |
5172 | DRI ("%dl", 1, QI); DRI ("%dh", 1, QIh); | |
5173 | DRI ("%rcx", 2, DI); DRI ("%ecx", 2, SI); DRI ("%cx", 2, HI); | |
5174 | DRI ("%cl", 2, QI); DRI ("%ch", 2, QIh); | |
5175 | DRI ("%rbx", 3, DI); DRI ("%ebx", 3, SI); DRI ("%bx", 3, HI); | |
5176 | DRI ("%bl", 3, QI); DRI ("%bh", 3, QIh); | |
5177 | DRI ("%rsi", 4, DI); DRI ("%esi", 4, SI); DRI ("%si", 4, HI); | |
5178 | DRI ("%sil", 4, QI); | |
5179 | DRI ("%rdi", 5, DI); DRI ("%edi", 5, SI); DRI ("%di", 5, HI); | |
5180 | DRI ("%dil", 5, QI); | |
5181 | DRI ("%rbp", 6, DI); DRI ("%ebp", 6, SI); DRI ("%bp", 6, HI); | |
5182 | DRI ("%rsp", 7, DI); DRI ("%esp", 7, SI); DRI ("%sp", 7, HI); | |
5183 | DRI ("%r8", 8, DI); DRI ("%r8d", 8, SI); DRI ("%r8w", 8, HI); | |
5184 | DRI ("%r8b", 8, QI); | |
5185 | DRI ("%r9", 9, DI); DRI ("%r9d", 9, SI); DRI ("%r9w", 9, HI); | |
5186 | DRI ("%r9b", 9, QI); | |
5187 | DRI ("%r10", 10, DI); DRI ("%r10d", 10, SI); DRI ("%r10w", 10, HI); | |
5188 | DRI ("%r10b", 10, QI); | |
5189 | DRI ("%r11", 11, DI); DRI ("%r11d", 11, SI); DRI ("%r11w", 11, HI); | |
5190 | DRI ("%r11b", 11, QI); | |
5191 | DRI ("%r12", 12, DI); DRI ("%r12d", 12, SI); DRI ("%r12w", 12, HI); | |
5192 | DRI ("%r12b", 12, QI); | |
5193 | DRI ("%r13", 13, DI); DRI ("%r13d", 13, SI); DRI ("%r13w", 13, HI); | |
5194 | DRI ("%r13b", 13, QI); | |
5195 | DRI ("%r14", 14, DI); DRI ("%r14d", 14, SI); DRI ("%r14w", 14, HI); | |
5196 | DRI ("%r14b", 14, QI); | |
5197 | DRI ("%r15", 15, DI); DRI ("%r15d", 15, SI); DRI ("%r15w", 15, HI); | |
5198 | DRI ("%r15b", 15, QI); | |
f83336a5 | 5199 | } else if (elf_machine == EM_386) { |
46a94997 SC |
5200 | DRI ("%eax", 0, SI); DRI ("%ax", 0, HI); DRI ("%al", 0, QI); |
5201 | DRI ("%ah", 0, QIh); | |
5202 | DRI ("%ecx", 1, SI); DRI ("%cx", 1, HI); DRI ("%cl", 1, QI); | |
5203 | DRI ("%ch", 1, QIh); | |
5204 | DRI ("%edx", 2, SI); DRI ("%dx", 2, HI); DRI ("%dl", 2, QI); | |
5205 | DRI ("%dh", 2, QIh); | |
5206 | DRI ("%ebx", 3, SI); DRI ("%bx", 3, HI); DRI ("%bl", 3, QI); | |
5207 | DRI ("%bh", 3, QIh); | |
5208 | DRI ("%esp", 4, SI); DRI ("%sp", 4, HI); | |
5209 | DRI ("%ebp", 5, SI); DRI ("%bp", 5, HI); | |
5210 | DRI ("%esi", 6, SI); DRI ("%si", 6, HI); DRI ("%sil", 6, QI); | |
5211 | DRI ("%edi", 7, SI); DRI ("%di", 7, HI); DRI ("%dil", 7, QI); | |
0491c523 | 5212 | } else if (elf_machine == EM_PPC || elf_machine == EM_PPC64) { |
46a94997 SC |
5213 | DRI ("%r0", 0, DI); |
5214 | DRI ("%r1", 1, DI); | |
5215 | DRI ("%r2", 2, DI); | |
5216 | DRI ("%r3", 3, DI); | |
5217 | DRI ("%r4", 4, DI); | |
5218 | DRI ("%r5", 5, DI); | |
5219 | DRI ("%r6", 6, DI); | |
5220 | DRI ("%r7", 7, DI); | |
5221 | DRI ("%r8", 8, DI); | |
5222 | DRI ("%r9", 9, DI); | |
5223 | DRI ("%r10", 10, DI); | |
5224 | DRI ("%r11", 11, DI); | |
5225 | DRI ("%r12", 12, DI); | |
5226 | DRI ("%r13", 13, DI); | |
5227 | DRI ("%r14", 14, DI); | |
5228 | DRI ("%r15", 15, DI); | |
5229 | DRI ("%r16", 16, DI); | |
5230 | DRI ("%r17", 17, DI); | |
5231 | DRI ("%r18", 18, DI); | |
5232 | DRI ("%r19", 19, DI); | |
5233 | DRI ("%r20", 20, DI); | |
5234 | DRI ("%r21", 21, DI); | |
5235 | DRI ("%r22", 22, DI); | |
5236 | DRI ("%r23", 23, DI); | |
5237 | DRI ("%r24", 24, DI); | |
5238 | DRI ("%r25", 25, DI); | |
5239 | DRI ("%r26", 26, DI); | |
5240 | DRI ("%r27", 27, DI); | |
5241 | DRI ("%r28", 28, DI); | |
5242 | DRI ("%r29", 29, DI); | |
5243 | DRI ("%r30", 30, DI); | |
5244 | DRI ("%r31", 31, DI); | |
8aabf152 | 5245 | // PR11821: unadorned register "names" without -mregnames |
46a94997 SC |
5246 | DRI ("0", 0, DI); |
5247 | DRI ("1", 1, DI); | |
5248 | DRI ("2", 2, DI); | |
5249 | DRI ("3", 3, DI); | |
5250 | DRI ("4", 4, DI); | |
5251 | DRI ("5", 5, DI); | |
5252 | DRI ("6", 6, DI); | |
5253 | DRI ("7", 7, DI); | |
5254 | DRI ("8", 8, DI); | |
5255 | DRI ("9", 9, DI); | |
5256 | DRI ("10", 10, DI); | |
5257 | DRI ("11", 11, DI); | |
5258 | DRI ("12", 12, DI); | |
5259 | DRI ("13", 13, DI); | |
5260 | DRI ("14", 14, DI); | |
5261 | DRI ("15", 15, DI); | |
5262 | DRI ("16", 16, DI); | |
5263 | DRI ("17", 17, DI); | |
5264 | DRI ("18", 18, DI); | |
5265 | DRI ("19", 19, DI); | |
5266 | DRI ("20", 20, DI); | |
5267 | DRI ("21", 21, DI); | |
5268 | DRI ("22", 22, DI); | |
5269 | DRI ("23", 23, DI); | |
5270 | DRI ("24", 24, DI); | |
5271 | DRI ("25", 25, DI); | |
5272 | DRI ("26", 26, DI); | |
5273 | DRI ("27", 27, DI); | |
5274 | DRI ("28", 28, DI); | |
5275 | DRI ("29", 29, DI); | |
5276 | DRI ("30", 30, DI); | |
5277 | DRI ("31", 31, DI); | |
14900130 | 5278 | } else if (elf_machine == EM_S390) { |
46a94997 SC |
5279 | DRI ("%r0", 0, DI); |
5280 | DRI ("%r1", 1, DI); | |
5281 | DRI ("%r2", 2, DI); | |
5282 | DRI ("%r3", 3, DI); | |
5283 | DRI ("%r4", 4, DI); | |
5284 | DRI ("%r5", 5, DI); | |
5285 | DRI ("%r6", 6, DI); | |
5286 | DRI ("%r7", 7, DI); | |
5287 | DRI ("%r8", 8, DI); | |
5288 | DRI ("%r9", 9, DI); | |
5289 | DRI ("%r10", 10, DI); | |
5290 | DRI ("%r11", 11, DI); | |
5291 | DRI ("%r12", 12, DI); | |
5292 | DRI ("%r13", 13, DI); | |
5293 | DRI ("%r14", 14, DI); | |
5294 | DRI ("%r15", 15, DI); | |
272c9036 WF |
5295 | } else if (elf_machine == EM_ARM) { |
5296 | DRI ("r0", 0, SI); | |
5297 | DRI ("r1", 1, SI); | |
5298 | DRI ("r2", 2, SI); | |
5299 | DRI ("r3", 3, SI); | |
5300 | DRI ("r4", 4, SI); | |
5301 | DRI ("r5", 5, SI); | |
5302 | DRI ("r6", 6, SI); | |
5303 | DRI ("r7", 7, SI); | |
5304 | DRI ("r8", 8, SI); | |
5305 | DRI ("r9", 9, SI); | |
5306 | DRI ("sl", 10, SI); | |
5307 | DRI ("fp", 11, SI); | |
5308 | DRI ("ip", 12, SI); | |
5309 | DRI ("sp", 13, SI); | |
5310 | DRI ("lr", 14, SI); | |
5311 | DRI ("pc", 15, SI); | |
14900130 | 5312 | } else if (arg_count) { |
8aabf152 | 5313 | /* permit this case; just fall back to dwarf */ |
f83336a5 | 5314 | } |
ae1418f0 | 5315 | #undef DRI |
f83336a5 | 5316 | |
ebbd2b45 | 5317 | need_debug_info = false; |
88e39987 | 5318 | if (probe_type == uprobe3_type) |
272c9036 WF |
5319 | { |
5320 | sdt_v3_tokenize(arg_string, arg_tokens); | |
5321 | assert(arg_count <= 12); | |
5322 | } | |
88e39987 | 5323 | else |
272c9036 WF |
5324 | { |
5325 | tokenize(arg_string, arg_tokens, " "); | |
5326 | assert(arg_count <= 10); | |
5327 | } | |
a8ec7719 | 5328 | } |
8aabf152 | 5329 | |
f83336a5 | 5330 | systemtap_session& session; |
332ba7e7 | 5331 | int elf_machine; |
aff5d390 | 5332 | const string & process_name; |
a794dbeb | 5333 | const string & provider_name; |
aff5d390 | 5334 | const string & probe_name; |
71e5e13d | 5335 | stap_sdt_probe_type probe_type; |
8aabf152 | 5336 | unsigned arg_count; |
aff5d390 | 5337 | vector<string> arg_tokens; |
46a94997 | 5338 | map<string, pair<unsigned,int> > dwarf_regs; |
ebbd2b45 | 5339 | bool need_debug_info; |
aff5d390 SC |
5340 | |
5341 | void visit_target_symbol (target_symbol* e); | |
6ef331c8 SC |
5342 | void visit_target_symbol_arg (target_symbol* e); |
5343 | void visit_target_symbol_context (target_symbol* e); | |
40a0c64e | 5344 | void visit_cast_op (cast_op* e); |
aff5d390 SC |
5345 | }; |
5346 | ||
7a05f484 SC |
5347 | |
5348 | void | |
6ef331c8 | 5349 | sdt_uprobe_var_expanding_visitor::visit_target_symbol_context (target_symbol* e) |
7a05f484 | 5350 | { |
6ef331c8 | 5351 | if (e->addressof) |
b530b5b3 | 5352 | throw semantic_error(_("cannot take address of context variable"), e->tok); |
6ef331c8 SC |
5353 | |
5354 | if (e->name == "$$name") | |
7a05f484 | 5355 | { |
6ef331c8 SC |
5356 | literal_string *myname = new literal_string (probe_name); |
5357 | myname->tok = e->tok; | |
5358 | provide(myname); | |
5359 | return; | |
5360 | } | |
7a05f484 | 5361 | |
6ef331c8 SC |
5362 | else if (e->name == "$$provider") |
5363 | { | |
5364 | literal_string *myname = new literal_string (provider_name); | |
5365 | myname->tok = e->tok; | |
5366 | provide(myname); | |
5367 | return; | |
5368 | } | |
a794dbeb | 5369 | |
6ef331c8 SC |
5370 | else if (e->name == "$$vars" || e->name == "$$parms") |
5371 | { | |
5372 | e->assert_no_components("sdt", true); | |
6ef331c8 SC |
5373 | |
5374 | // Convert $$vars to sprintf of a list of vars which we recursively evaluate | |
5375 | // NB: we synthesize a new token here rather than reusing | |
5376 | // e->tok, because print_format::print likes to use | |
5377 | // its tok->content. | |
5378 | token* pf_tok = new token(*e->tok); | |
5379 | pf_tok->content = "sprintf"; | |
63ea4244 | 5380 | |
6ef331c8 SC |
5381 | print_format* pf = print_format::create(pf_tok); |
5382 | ||
5383 | for (unsigned i = 1; i <= arg_count; ++i) | |
5384 | { | |
5385 | if (i > 1) | |
5386 | pf->raw_components += " "; | |
5387 | target_symbol *tsym = new target_symbol; | |
5388 | tsym->tok = e->tok; | |
5389 | tsym->name = "$arg" + lex_cast(i); | |
5390 | pf->raw_components += tsym->name; | |
5391 | tsym->components = e->components; | |
5392 | ||
5393 | expression *texp = require (tsym); | |
5394 | if (!e->components.empty() && | |
5395 | e->components[0].type == target_symbol::comp_pretty_print) | |
5396 | pf->raw_components += "=%s"; | |
5397 | else | |
5398 | pf->raw_components += "=%#x"; | |
5399 | pf->args.push_back(texp); | |
5400 | } | |
5401 | ||
5402 | pf->components = print_format::string_to_components(pf->raw_components); | |
5403 | provide (pf); | |
5404 | } | |
5405 | else | |
5406 | assert(0); // shouldn't get here | |
5407 | } | |
5408 | ||
5409 | ||
5410 | void | |
5411 | sdt_uprobe_var_expanding_visitor::visit_target_symbol_arg (target_symbol *e) | |
5412 | { | |
5413 | try | |
5414 | { | |
8aabf152 | 5415 | unsigned argno = 0; // the N in $argN |
c69a87e0 | 5416 | try |
aff5d390 | 5417 | { |
5ecaa5a7 | 5418 | if (startswith(e->name, "$arg")) |
8aabf152 | 5419 | argno = lex_cast<unsigned>(e->name.substr(4)); |
aff5d390 | 5420 | } |
c69a87e0 | 5421 | catch (const runtime_error& f) // non-integral $arg suffix: e.g. $argKKKSDF |
aff5d390 | 5422 | { |
8aabf152 | 5423 | argno = 0; |
aff5d390 | 5424 | } |
5ecaa5a7 | 5425 | |
8aabf152 FCE |
5426 | if (arg_count == 0 || // a sdt.h variant without .probe-stored arg_count |
5427 | argno < 1 || argno > arg_count) // a $argN with out-of-range N | |
aff5d390 | 5428 | { |
8aabf152 FCE |
5429 | // NB: Either |
5430 | // 1) uprobe1_type $argN or $FOO (we don't know the arg_count) | |
5431 | // 2) uprobe2_type $FOO (no probe args) | |
5432 | // both of which get resolved later. | |
5433 | need_debug_info = true; | |
5434 | provide(e); | |
5435 | return; | |
aff5d390 | 5436 | } |
277c21bc | 5437 | |
8aabf152 FCE |
5438 | assert (arg_tokens.size() >= argno); |
5439 | string asmarg = arg_tokens[argno-1]; // $arg1 => arg_tokens[0] | |
c57ea854 | 5440 | |
8aabf152 FCE |
5441 | // Now we try to parse this thing, which is an assembler operand |
5442 | // expression. If we can't, we warn, back down to need_debug_info | |
b874bd52 | 5443 | // and hope for the best. Here is the syntax for a few architectures. |
9859b766 | 5444 | // Note that the power iN syntax is only for V3 sdt.h; gcc emits the i. |
8095a157 FCE |
5445 | // |
5446 | // literal reg reg reg + base+index*size+offset | |
b874bd52 | 5447 | // indirect offset |
8095a157 | 5448 | // x86 $N %rR (%rR) N(%rR) O(%bR,%iR,S) |
b874bd52 SC |
5449 | // power iN R (R) N(R) |
5450 | // ia64 N rR [r16] | |
5451 | // s390 N %rR 0(rR) N(r15) | |
5452 | // arm #N rR [rR] [rR, #N] | |
5453 | ||
8aabf152 FCE |
5454 | expression* argexpr = 0; // filled in in case of successful parse |
5455 | ||
5456 | string percent_regnames; | |
5457 | string regnames; | |
5458 | vector<string> matches; | |
71e5e13d | 5459 | long precision; |
8aabf152 FCE |
5460 | int rc; |
5461 | ||
40fe32e0 SC |
5462 | // Parse the leading length |
5463 | ||
5464 | if (asmarg.find('@') != string::npos) | |
5465 | { | |
5466 | precision = lex_cast<int>(asmarg.substr(0, asmarg.find('@'))); | |
5467 | asmarg = asmarg.substr(asmarg.find('@')+1); | |
5468 | } | |
71e5e13d SC |
5469 | else |
5470 | { | |
5471 | // V1/V2 do not have precision field so default to signed long | |
5472 | // V3 asm does not have precision field so default to unsigned long | |
5473 | if (probe_type == uprobe3_type) | |
5474 | precision = sizeof(long); // this is an asm probe | |
5475 | else | |
5476 | precision = -sizeof(long); | |
5477 | } | |
40fe32e0 | 5478 | |
8aabf152 FCE |
5479 | // test for a numeric literal. |
5480 | // Only accept (signed) decimals throughout. XXX | |
5481 | ||
5482 | // PR11821. NB: on powerpc, literals are not prefixed with $, | |
5483 | // so this regex does not match. But that's OK, since without | |
5484 | // -mregnames, we can't tell them apart from register numbers | |
5485 | // anyway. With -mregnames, we could, if gcc somehow | |
5486 | // communicated to us the presence of that option, but alas it | |
5487 | // doesn't. http://gcc.gnu.org/PR44995. | |
272c9036 | 5488 | rc = regexp_match (asmarg, "^[i\\$#][-]?[0-9][0-9]*$", matches); |
8aabf152 FCE |
5489 | if (! rc) |
5490 | { | |
75a371ce JS |
5491 | string sn = matches[0].substr(1); |
5492 | int64_t n; | |
5493 | try | |
5494 | { | |
5495 | // We have to pay attention to the size & sign, as gcc sometimes | |
5496 | // propagates constants that don't quite match, like a negative | |
5497 | // value to fill an unsigned type. | |
5498 | switch (precision) | |
5499 | { | |
5500 | case -1: n = lex_cast< int8_t>(sn); break; | |
5501 | case 1: n = lex_cast< uint8_t>(sn); break; | |
5502 | case -2: n = lex_cast< int16_t>(sn); break; | |
5503 | case 2: n = lex_cast<uint16_t>(sn); break; | |
5504 | case -4: n = lex_cast< int32_t>(sn); break; | |
5505 | case 4: n = lex_cast<uint32_t>(sn); break; | |
5506 | default: | |
5507 | case -8: n = lex_cast< int64_t>(sn); break; | |
5508 | case 8: n = lex_cast<uint64_t>(sn); break; | |
5509 | } | |
5510 | } | |
5511 | catch (std::runtime_error&) | |
5512 | { | |
5513 | goto not_matched; | |
5514 | } | |
5515 | literal_number* ln = new literal_number(n); | |
8aabf152 FCE |
5516 | ln->tok = e->tok; |
5517 | argexpr = ln; | |
5518 | goto matched; | |
5519 | } | |
5520 | ||
14900130 SC |
5521 | if (dwarf_regs.empty()) |
5522 | goto not_matched; | |
d5b83cee | 5523 | |
8aabf152 FCE |
5524 | // Build regex pieces out of the known dwarf_regs. We keep two separate |
5525 | // lists: ones with the % prefix (and thus unambigiuous even despite PR11821), | |
5526 | // and ones with no prefix (and thus only usable in unambiguous contexts). | |
46a94997 | 5527 | for (map<string,pair<unsigned,int> >::iterator ri = dwarf_regs.begin(); ri != dwarf_regs.end(); ri++) |
8aabf152 FCE |
5528 | { |
5529 | string regname = ri->first; | |
5530 | assert (regname != ""); | |
5531 | regnames += string("|")+regname; | |
5532 | if (regname[0]=='%') | |
5533 | percent_regnames += string("|")+regname; | |
5534 | } | |
5535 | // clip off leading | | |
5536 | regnames = regnames.substr(1); | |
272c9036 WF |
5537 | if (percent_regnames != "") |
5538 | percent_regnames = percent_regnames.substr(1); | |
8aabf152 FCE |
5539 | |
5540 | // test for REGISTER | |
5541 | // NB: Because PR11821, we must use percent_regnames here. | |
272c9036 | 5542 | if (elf_machine == EM_PPC || elf_machine == EM_PPC64 || elf_machine == EM_ARM) |
9109f487 SC |
5543 | rc = regexp_match (asmarg, string("^(")+regnames+string(")$"), matches); |
5544 | else | |
332ba7e7 | 5545 | rc = regexp_match (asmarg, string("^(")+percent_regnames+string(")$"), matches); |
8aabf152 FCE |
5546 | if (! rc) |
5547 | { | |
5548 | string regname = matches[1]; | |
46a94997 SC |
5549 | map<string,pair<unsigned,int> >::iterator ri = dwarf_regs.find (regname); |
5550 | if (ri != dwarf_regs.end()) // known register | |
8aabf152 FCE |
5551 | { |
5552 | embedded_expr *get_arg1 = new embedded_expr; | |
19c22e1f | 5553 | string width_adjust; |
46a94997 | 5554 | switch (ri->second.second) |
19c22e1f | 5555 | { |
892ec39a SC |
5556 | case QI: width_adjust = ") & 0xff)"; break; |
5557 | case QIh: width_adjust = ">>8) & 0xff)"; break; | |
46a94997 | 5558 | case HI: |
71e5e13d | 5559 | // preserve 16 bit register signness |
892ec39a SC |
5560 | width_adjust = ") & 0xffff)"; |
5561 | if (precision < 0) | |
55b377f4 | 5562 | width_adjust += " << 48 >> 48"; |
ac8a78aa SC |
5563 | break; |
5564 | case SI: | |
5565 | // preserve 32 bit register signness | |
892ec39a SC |
5566 | width_adjust = ") & 0xffffffff)"; |
5567 | if (precision < 0) | |
55b377f4 | 5568 | width_adjust += " << 32 >> 32"; |
19c22e1f | 5569 | break; |
892ec39a | 5570 | default: width_adjust = "))"; |
19c22e1f | 5571 | } |
55b377f4 SC |
5572 | string type = ""; |
5573 | if (probe_type == uprobe3_type) | |
5574 | type = (precision < 0 | |
5575 | ? "(int" : "(uint") + lex_cast(abs(precision) * 8) + "_t)"; | |
5576 | type = type + "(("; | |
8aabf152 FCE |
5577 | get_arg1->tok = e->tok; |
5578 | get_arg1->code = string("/* unprivileged */ /* pure */") | |
892ec39a | 5579 | + string(" ((int64_t)") + type |
8aabf152 FCE |
5580 | + (is_user_module (process_name) |
5581 | ? string("u_fetch_register(") | |
5582 | : string("k_fetch_register(")) | |
46a94997 | 5583 | + lex_cast(dwarf_regs[regname].first) + string("))") |
19c22e1f | 5584 | + width_adjust; |
8aabf152 FCE |
5585 | argexpr = get_arg1; |
5586 | goto matched; | |
5587 | } | |
5588 | // invalid register name, fall through | |
5589 | } | |
40fe32e0 | 5590 | |
272c9036 | 5591 | int reg, offset1; |
e5b7b83f | 5592 | // test for OFFSET(REGISTER) where OFFSET is +-N+-N+-N |
40fe32e0 | 5593 | // NB: Despite PR11821, we can use regnames here, since the parentheses |
e5b7b83f | 5594 | // make things unambiguous. (Note: gdb/stap-probe.c also parses this) |
272c9036 WF |
5595 | // On ARM test for [REGISTER, OFFSET] |
5596 | if (elf_machine == EM_ARM) | |
5597 | { | |
5598 | rc = regexp_match (asmarg, string("^\\[(")+regnames+string("), #([+-]?[0-9]+)([+-][0-9]*)?([+-][0-9]*)?\\]$"), matches); | |
5599 | reg = 1; | |
5600 | offset1 = 2; | |
5601 | } | |
5602 | else | |
5603 | { | |
5604 | rc = regexp_match (asmarg, string("^([+-]?[0-9]*)([+-][0-9]*)?([+-][0-9]*)?[(](")+regnames+string(")[)]$"), matches); | |
5605 | reg = 4; | |
5606 | offset1 = 1; | |
5607 | } | |
8aabf152 FCE |
5608 | if (! rc) |
5609 | { | |
e5b7b83f | 5610 | string regname; |
8aabf152 | 5611 | int64_t disp = 0; |
272c9036 WF |
5612 | if (matches[reg].length()) |
5613 | regname = matches[reg]; | |
8095a157 FCE |
5614 | if (dwarf_regs.find (regname) == dwarf_regs.end()) |
5615 | goto not_matched; | |
5616 | ||
272c9036 | 5617 | for (int i=offset1; i <= (offset1 + 2); i++) |
e5b7b83f SC |
5618 | if (matches[i].length()) |
5619 | try | |
5620 | { | |
5621 | disp += lex_cast<int64_t>(matches[i]); // should decode positive/negative hex/decimal | |
5622 | } | |
8aabf152 FCE |
5623 | catch (const runtime_error& f) // unparseable offset |
5624 | { | |
5625 | goto not_matched; // can't just 'break' out of | |
5626 | // this case or use a sentinel | |
5627 | // value, unfortunately | |
5628 | } | |
5629 | ||
8aabf152 | 5630 | // synthesize user_long(%{fetch_register(R)%} + D) |
8aabf152 FCE |
5631 | embedded_expr *get_arg1 = new embedded_expr; |
5632 | get_arg1->tok = e->tok; | |
5633 | get_arg1->code = string("/* unprivileged */ /* pure */") | |
5634 | + (is_user_module (process_name) | |
5635 | ? string("u_fetch_register(") | |
5636 | : string("k_fetch_register(")) | |
46a94997 | 5637 | + lex_cast(dwarf_regs[regname].first) + string(")"); |
8aabf152 | 5638 | // XXX: may we ever need to cast that to a narrower type? |
40fe32e0 | 5639 | |
8aabf152 FCE |
5640 | literal_number* inc = new literal_number(disp); |
5641 | inc->tok = e->tok; | |
40fe32e0 | 5642 | |
8aabf152 FCE |
5643 | binary_expression *be = new binary_expression; |
5644 | be->tok = e->tok; | |
5645 | be->left = get_arg1; | |
5646 | be->op = "+"; | |
5647 | be->right = inc; | |
40fe32e0 | 5648 | |
8aabf152 | 5649 | functioncall *fc = new functioncall; |
40fe32e0 SC |
5650 | switch (precision) |
5651 | { | |
7f6ce9ab SC |
5652 | case 1: case -1: |
5653 | fc->function = "user_int8"; break; | |
5654 | case 2: | |
5655 | fc->function = "user_uint16"; break; | |
5656 | case -2: | |
5657 | fc->function = "user_int16"; break; | |
5658 | case 4: | |
5659 | fc->function = "user_uint32"; break; | |
5660 | case -4: | |
5661 | fc->function = "user_int32"; break; | |
5662 | case 8: case -8: | |
5663 | fc->function = "user_int64"; break; | |
40fe32e0 SC |
5664 | default: fc->function = "user_long"; |
5665 | } | |
8aabf152 FCE |
5666 | fc->tok = e->tok; |
5667 | fc->args.push_back(be); | |
366af4e7 | 5668 | |
8aabf152 FCE |
5669 | argexpr = fc; |
5670 | goto matched; | |
5671 | } | |
8095a157 FCE |
5672 | |
5673 | // test for OFFSET(BASE_REGISTER,INDEX_REGISTER[,SCALE]) where OFFSET is +-N+-N+-N | |
5674 | // NB: Despite PR11821, we can use regnames here, since the parentheses | |
5675 | // make things unambiguous. (Note: gdb/stap-probe.c also parses this) | |
0f7b51d6 | 5676 | rc = regexp_match (asmarg, string("^([+-]?[0-9]*)([+-][0-9]*)?([+-][0-9]*)?[(](")+regnames+string("),(")+regnames+string(")(,[1248])?[)]$"), matches); |
8095a157 FCE |
5677 | if (! rc) |
5678 | { | |
5679 | string baseregname; | |
5680 | string indexregname; | |
5681 | int64_t disp = 0; | |
5682 | short scale = 1; | |
5683 | ||
5684 | if (matches[6].length()) | |
5685 | try | |
5686 | { | |
5687 | scale = lex_cast<short>(matches[6].substr(1)); // NB: skip the comma! | |
5688 | // We could verify that scale is one of 1,2,4,8, | |
5689 | // but it doesn't really matter. An erroneous | |
5690 | // address merely results in run-time errors. | |
8aabf152 | 5691 | } |
8095a157 FCE |
5692 | catch (const runtime_error &f) // unparseable scale |
5693 | { | |
5694 | goto not_matched; | |
5695 | } | |
5696 | ||
5697 | if (matches[4].length()) | |
5698 | baseregname = matches[4]; | |
5699 | if (dwarf_regs.find (baseregname) == dwarf_regs.end()) | |
5700 | goto not_matched; | |
5701 | ||
5702 | if (matches[5].length()) | |
5703 | indexregname = matches[5]; | |
5704 | if (dwarf_regs.find (indexregname) == dwarf_regs.end()) | |
5705 | goto not_matched; | |
5706 | ||
f7719b3d | 5707 | for (int i = 1; i <= 3; i++) // up to three OFFSET terms |
8095a157 FCE |
5708 | if (matches[i].length()) |
5709 | try | |
5710 | { | |
5711 | disp += lex_cast<int64_t>(matches[i]); // should decode positive/negative hex/decimal | |
5712 | } | |
5713 | catch (const runtime_error& f) // unparseable offset | |
5714 | { | |
5715 | goto not_matched; // can't just 'break' out of | |
5716 | // this case or use a sentinel | |
5717 | // value, unfortunately | |
5718 | } | |
5719 | ||
5720 | // synthesize user_long(%{fetch_register(R1)+fetch_register(R2)*N%} + D) | |
5721 | ||
5722 | embedded_expr *get_arg1 = new embedded_expr; | |
5723 | string regfn = is_user_module (process_name) | |
5724 | ? string("u_fetch_register") | |
5725 | : string("k_fetch_register"); // NB: in practice sdt.h probes are for userspace only | |
5726 | ||
5727 | get_arg1->tok = e->tok; | |
5728 | get_arg1->code = string("/* unprivileged */ /* pure */") | |
5729 | + regfn + string("(")+lex_cast(dwarf_regs[baseregname].first)+string(")") | |
5730 | + string("+(") | |
5731 | + regfn + string("(")+lex_cast(dwarf_regs[indexregname].first)+string(")") | |
5732 | + string("*") | |
5733 | + lex_cast(scale) | |
5734 | + string(")"); | |
5735 | ||
5736 | // NB: could plop this +DISPLACEMENT bit into the embedded-c expression too | |
5737 | literal_number* inc = new literal_number(disp); | |
5738 | inc->tok = e->tok; | |
5739 | ||
5740 | binary_expression *be = new binary_expression; | |
5741 | be->tok = e->tok; | |
5742 | be->left = get_arg1; | |
5743 | be->op = "+"; | |
5744 | be->right = inc; | |
5745 | ||
5746 | functioncall *fc = new functioncall; | |
5747 | switch (precision) | |
5748 | { | |
5749 | case 1: case -1: | |
5750 | fc->function = "user_int8"; break; | |
5751 | case 2: | |
5752 | fc->function = "user_uint16"; break; | |
5753 | case -2: | |
5754 | fc->function = "user_int16"; break; | |
5755 | case 4: | |
5756 | fc->function = "user_uint32"; break; | |
5757 | case -4: | |
5758 | fc->function = "user_int32"; break; | |
5759 | case 8: case -8: | |
5760 | fc->function = "user_int64"; break; | |
5761 | default: fc->function = "user_long"; | |
5762 | } | |
5763 | fc->tok = e->tok; | |
5764 | fc->args.push_back(be); | |
5765 | ||
5766 | argexpr = fc; | |
5767 | goto matched; | |
8aabf152 FCE |
5768 | } |
5769 | ||
8aabf152 FCE |
5770 | |
5771 | not_matched: | |
5772 | // The asmarg operand was not recognized. Back down to dwarf. | |
5773 | if (! session.suppress_warnings) | |
84fef8ee FCE |
5774 | { |
5775 | if (probe_type == UPROBE3_TYPE) | |
5776 | session.print_warning (_F("Can't parse SDT_V3 operand '%s'", asmarg.c_str()), e->tok); | |
5777 | else // must be *PROBE2; others don't get asm operands | |
5778 | session.print_warning (_F("Downgrading SDT_V2 probe argument to dwarf, can't parse '%s'", | |
5779 | asmarg.c_str()), e->tok); | |
5780 | } | |
8aabf152 FCE |
5781 | assert (argexpr == 0); |
5782 | need_debug_info = true; | |
5783 | provide (e); | |
5784 | return; | |
366af4e7 | 5785 | |
8aabf152 FCE |
5786 | matched: |
5787 | assert (argexpr != 0); | |
366af4e7 RM |
5788 | |
5789 | if (session.verbose > 2) | |
1e41115c | 5790 | //TRANSLATORS: We're mapping the operand to a new expression*. |
b530b5b3 | 5791 | clog << _F("mapped asm operand %s to ", asmarg.c_str()) << *argexpr << endl; |
366af4e7 | 5792 | |
aff5d390 | 5793 | if (e->components.empty()) // We have a scalar |
8aabf152 FCE |
5794 | { |
5795 | if (e->addressof) | |
b530b5b3 | 5796 | throw semantic_error(_("cannot take address of sdt variable"), e->tok); |
8aabf152 FCE |
5797 | provide (argexpr); |
5798 | return; | |
5799 | } | |
5800 | else // $var->foo | |
5801 | { | |
5802 | cast_op *cast = new cast_op; | |
5803 | cast->name = "@cast"; | |
5804 | cast->tok = e->tok; | |
5805 | cast->operand = argexpr; | |
5806 | cast->components = e->components; | |
5807 | cast->type_name = probe_name + "_arg" + lex_cast(argno); | |
5808 | cast->module = process_name; | |
5809 | cast->visit(this); | |
5810 | return; | |
5811 | } | |
366af4e7 | 5812 | |
8aabf152 | 5813 | /* NOTREACHED */ |
aff5d390 SC |
5814 | } |
5815 | catch (const semantic_error &er) | |
5816 | { | |
5817 | e->chain (er); | |
5818 | provide (e); | |
5819 | } | |
5820 | } | |
5821 | ||
5822 | ||
6ef331c8 SC |
5823 | void |
5824 | sdt_uprobe_var_expanding_visitor::visit_target_symbol (target_symbol* e) | |
5825 | { | |
5826 | try | |
5827 | { | |
49131a6d MW |
5828 | assert(e->name.size() > 0 |
5829 | && ((e->name[0] == '$' && e->target_name == "") | |
5830 | || (e->name == "@var" && e->target_name != ""))); | |
6ef331c8 SC |
5831 | |
5832 | if (e->name == "$$name" || e->name == "$$provider" || e->name == "$$parms" || e->name == "$$vars") | |
5833 | visit_target_symbol_context (e); | |
5834 | else | |
5835 | visit_target_symbol_arg (e); | |
5836 | } | |
5837 | catch (const semantic_error &er) | |
5838 | { | |
5839 | e->chain (er); | |
5840 | provide (e); | |
5841 | } | |
5842 | } | |
5843 | ||
5844 | ||
40a0c64e JS |
5845 | void |
5846 | sdt_uprobe_var_expanding_visitor::visit_cast_op (cast_op* e) | |
5847 | { | |
5848 | // Fill in our current module context if needed | |
5849 | if (e->module.empty()) | |
5850 | e->module = process_name; | |
5851 | ||
5852 | var_expanding_visitor::visit_cast_op(e); | |
5853 | } | |
5854 | ||
5855 | ||
aff5d390 SC |
5856 | void |
5857 | sdt_kprobe_var_expanding_visitor::visit_target_symbol (target_symbol *e) | |
5858 | { | |
5859 | try | |
5860 | { | |
277c21bc | 5861 | if (e->name == "$$name") |
aff5d390 SC |
5862 | { |
5863 | if (e->addressof) | |
b530b5b3 | 5864 | throw semantic_error(_("cannot take address of sdt context variable"), e->tok); |
aff5d390 SC |
5865 | |
5866 | literal_string *myname = new literal_string (probe_name); | |
5867 | myname->tok = e->tok; | |
5868 | provide(myname); | |
5869 | return; | |
5870 | } | |
277c21bc | 5871 | if (e->name == "$$provider") |
a794dbeb FCE |
5872 | { |
5873 | if (e->addressof) | |
b530b5b3 | 5874 | throw semantic_error(_("cannot take address of sdt context variable"), e->tok); |
a794dbeb FCE |
5875 | |
5876 | literal_string *myname = new literal_string (provider_name); | |
5877 | myname->tok = e->tok; | |
5878 | provide(myname); | |
5879 | return; | |
5880 | } | |
aff5d390 | 5881 | |
5ecaa5a7 | 5882 | int argno = -1; |
aff5d390 SC |
5883 | try |
5884 | { | |
5ecaa5a7 JS |
5885 | if (startswith(e->name, "$arg")) |
5886 | argno = lex_cast<int>(e->name.substr(4)); | |
aff5d390 SC |
5887 | } |
5888 | catch (const runtime_error& f) // non-integral $arg suffix: e.g. $argKKKSDF | |
5889 | { | |
aff5d390 | 5890 | } |
5ecaa5a7 | 5891 | if (argno < 0) |
b530b5b3 | 5892 | throw semantic_error(_("invalid variable, must be of the form $argN"), e->tok); |
aff5d390 | 5893 | if (argno < 1 || argno > arg_count) |
b530b5b3 | 5894 | throw semantic_error(_("invalid argument number"), e->tok); |
5ecaa5a7 | 5895 | |
c69a87e0 FCE |
5896 | bool lvalue = is_active_lvalue(e); |
5897 | functioncall *fc = new functioncall; | |
63ea4244 | 5898 | |
c69a87e0 FCE |
5899 | // First two args are hidden: 1. pointer to probe name 2. task id |
5900 | if (arg_count < 2) | |
aff5d390 | 5901 | { |
71e5e13d | 5902 | fc->function = "long_arg"; |
aff5d390 SC |
5903 | fc->type = pe_long; |
5904 | fc->tok = e->tok; | |
5905 | // skip the hidden args | |
5906 | literal_number* num = new literal_number(argno + 2); | |
5907 | num->tok = e->tok; | |
5908 | fc->args.push_back(num); | |
5909 | } | |
5910 | else | |
5911 | { | |
5912 | // args are passed in arg3 as members of a struct | |
5913 | fc->function = "user_long"; | |
5914 | fc->tok = e->tok; | |
5915 | binary_expression *be = new binary_expression; | |
5916 | be->tok = e->tok; | |
5917 | functioncall *get_arg1 = new functioncall; | |
5918 | get_arg1->function = "pointer_arg"; | |
5919 | get_arg1->tok = e->tok; | |
5920 | // arg3 is the pointer to a struct of arguments | |
c57ea854 | 5921 | literal_number* num = new literal_number(3); |
aff5d390 SC |
5922 | num->tok = e->tok; |
5923 | get_arg1->args.push_back(num); | |
5924 | ||
5925 | be->left = get_arg1; | |
5926 | be->op = "+"; | |
5927 | // offset in struct to the desired arg | |
5928 | literal_number* inc = new literal_number((argno - 1) * 8); | |
5929 | inc->tok = e->tok; | |
5930 | be->right = inc; | |
5931 | fc->args.push_back(be); | |
5932 | } | |
c69a87e0 | 5933 | if (lvalue) |
aff5d390 | 5934 | *(target_symbol_setter_functioncalls.top()) = fc; |
63ea4244 | 5935 | |
aff5d390 SC |
5936 | if (e->components.empty()) // We have a scalar |
5937 | { | |
5938 | if (e->addressof) | |
b530b5b3 | 5939 | throw semantic_error(_("cannot take address of sdt variable"), e->tok); |
63ea4244 | 5940 | |
aff5d390 SC |
5941 | provide(fc); |
5942 | return; | |
5943 | } | |
c69a87e0 | 5944 | cast_op *cast = new cast_op; |
277c21bc | 5945 | cast->name = "@cast"; |
c69a87e0 FCE |
5946 | cast->tok = e->tok; |
5947 | cast->operand = fc; | |
5948 | cast->components = e->components; | |
7f6b80bd | 5949 | cast->type_name = probe_name + "_arg" + lex_cast(argno); |
c69a87e0 | 5950 | cast->module = process_name; |
63ea4244 | 5951 | |
c69a87e0 | 5952 | cast->visit(this); |
7a05f484 | 5953 | } |
c69a87e0 | 5954 | catch (const semantic_error &er) |
ad002306 | 5955 | { |
1af1e62d | 5956 | e->chain (er); |
c69a87e0 | 5957 | provide (e); |
ad002306 | 5958 | } |
7a05f484 | 5959 | } |
46b84a80 | 5960 | |
277c21bc | 5961 | |
40a0c64e JS |
5962 | void |
5963 | sdt_kprobe_var_expanding_visitor::visit_cast_op (cast_op* e) | |
5964 | { | |
5965 | // Fill in our current module context if needed | |
5966 | if (e->module.empty()) | |
5967 | e->module = process_name; | |
5968 | ||
5969 | var_expanding_visitor::visit_cast_op(e); | |
5970 | } | |
5971 | ||
5972 | ||
576eaefe SC |
5973 | void |
5974 | plt_expanding_visitor::visit_target_symbol (target_symbol *e) | |
5975 | { | |
5976 | try | |
5977 | { | |
5978 | if (e->name == "$$name") | |
5979 | { | |
5980 | literal_string *myname = new literal_string (entry); | |
5981 | myname->tok = e->tok; | |
5982 | provide(myname); | |
5983 | return; | |
5984 | } | |
3d69c03f JS |
5985 | |
5986 | // variable not found -> throw a semantic error | |
5987 | // (only to be caught right away, but this may be more complex later...) | |
5988 | string alternatives = "$$name"; | |
5989 | throw semantic_error(_F("unable to find plt variable '%s' (alternatives: %s)", | |
5990 | e->name.c_str(), alternatives.c_str()), e->tok); | |
576eaefe SC |
5991 | } |
5992 | catch (const semantic_error &er) | |
5993 | { | |
5994 | e->chain (er); | |
5995 | provide (e); | |
5996 | } | |
5997 | } | |
5998 | ||
5999 | ||
edce5b67 JS |
6000 | struct sdt_query : public base_query |
6001 | { | |
6002 | sdt_query(probe * base_probe, probe_point * base_loc, | |
6003 | dwflpp & dw, literal_map_t const & params, | |
51d6bda3 | 6004 | vector<derived_probe *> & results, const string user_lib); |
edce5b67 | 6005 | |
51d6bda3 | 6006 | void query_library (const char *data); |
576eaefe | 6007 | void query_plt (const char *entry, size_t addr) {} |
edce5b67 JS |
6008 | void handle_query_module(); |
6009 | ||
6010 | private: | |
15284963 | 6011 | stap_sdt_probe_type probe_type; |
d61ea602 | 6012 | enum { probe_section=0, note_section=1, unknown_section=-1 } probe_loc; |
edce5b67 JS |
6013 | probe * base_probe; |
6014 | probe_point * base_loc; | |
6846cfc8 | 6015 | literal_map_t const & params; |
edce5b67 | 6016 | vector<derived_probe *> & results; |
a794dbeb FCE |
6017 | string pp_mark; |
6018 | string pp_provider; | |
51d6bda3 | 6019 | string user_lib; |
edce5b67 JS |
6020 | |
6021 | set<string> probes_handled; | |
6022 | ||
6023 | Elf_Data *pdata; | |
6024 | size_t probe_scn_offset; | |
6025 | size_t probe_scn_addr; | |
aff5d390 | 6026 | uint64_t arg_count; |
40fe32e0 | 6027 | GElf_Addr base; |
c57ea854 | 6028 | GElf_Addr pc; |
aff5d390 | 6029 | string arg_string; |
edce5b67 | 6030 | string probe_name; |
a794dbeb | 6031 | string provider_name; |
79a0ca08 | 6032 | Dwarf_Addr semaphore; |
edce5b67 JS |
6033 | |
6034 | bool init_probe_scn(); | |
6b51ee12 | 6035 | bool get_next_probe(); |
c57ea854 SC |
6036 | void iterate_over_probe_entries(); |
6037 | void handle_probe_entry(); | |
edce5b67 | 6038 | |
40fe32e0 SC |
6039 | static void setup_note_probe_entry_callback (void *object, int type, const char *data, size_t len); |
6040 | void setup_note_probe_entry (int type, const char *data, size_t len); | |
6041 | ||
edce5b67 | 6042 | void convert_probe(probe *base); |
4ddb6dd0 | 6043 | void record_semaphore(vector<derived_probe *> & results, unsigned start); |
c72aa911 | 6044 | probe* convert_location(); |
40fe32e0 | 6045 | bool have_uprobe() {return probe_type == uprobe1_type || probe_type == uprobe2_type || probe_type == uprobe3_type;} |
aff5d390 | 6046 | bool have_kprobe() {return probe_type == kprobe1_type || probe_type == kprobe2_type;} |
c57ea854 SC |
6047 | bool have_debuginfo_uprobe(bool need_debug_info) |
6048 | {return probe_type == uprobe1_type | |
40fe32e0 | 6049 | || ((probe_type == uprobe2_type || probe_type == uprobe3_type) |
c57ea854 | 6050 | && need_debug_info);} |
40fe32e0 | 6051 | bool have_debuginfoless_uprobe() {return probe_type == uprobe2_type || probe_type == uprobe3_type;} |
edce5b67 JS |
6052 | }; |
6053 | ||
6054 | ||
6055 | sdt_query::sdt_query(probe * base_probe, probe_point * base_loc, | |
6056 | dwflpp & dw, literal_map_t const & params, | |
51d6bda3 | 6057 | vector<derived_probe *> & results, const string user_lib): |
d61ea602 JS |
6058 | base_query(dw, params), probe_type(unknown_probe_type), |
6059 | probe_loc(unknown_section), base_probe(base_probe), | |
74fe61bc LB |
6060 | base_loc(base_loc), params(params), results(results), user_lib(user_lib), |
6061 | probe_scn_offset(0), probe_scn_addr(0), arg_count(0), base(0), pc(0), | |
6062 | semaphore(0) | |
edce5b67 | 6063 | { |
a794dbeb FCE |
6064 | assert(get_string_param(params, TOK_MARK, pp_mark)); |
6065 | get_string_param(params, TOK_PROVIDER, pp_provider); // pp_provider == "" -> unspecified | |
6066 | ||
ef428667 FCE |
6067 | // PR10245: permit usage of dtrace-y "-" separator in marker name; |
6068 | // map it to double-underscores. | |
6069 | size_t pos = 0; | |
6070 | while (1) // there may be more than one | |
6071 | { | |
a794dbeb | 6072 | size_t i = pp_mark.find("-", pos); |
ef428667 | 6073 | if (i == string::npos) break; |
a794dbeb | 6074 | pp_mark.replace (i, 1, "__"); |
ef428667 FCE |
6075 | pos = i+1; // resume searching after the inserted __ |
6076 | } | |
a794dbeb FCE |
6077 | |
6078 | // XXX: same for pp_provider? | |
edce5b67 JS |
6079 | } |
6080 | ||
6081 | ||
6082 | void | |
c57ea854 | 6083 | sdt_query::handle_probe_entry() |
edce5b67 | 6084 | { |
c57ea854 SC |
6085 | if (! have_uprobe() |
6086 | && !probes_handled.insert(probe_name).second) | |
edce5b67 JS |
6087 | return; |
6088 | ||
6089 | if (sess.verbose > 3) | |
c57ea854 | 6090 | { |
b530b5b3 LB |
6091 | //TRANSLATORS: Describing what probe type (kprobe or uprobe) the probe |
6092 | //TRANSLATORS: is matched to. | |
6093 | clog << _F("matched probe_name %s probe type ", probe_name.c_str()); | |
c57ea854 SC |
6094 | switch (probe_type) |
6095 | { | |
6096 | case uprobe1_type: | |
6097 | clog << "uprobe1 at 0x" << hex << pc << dec << endl; | |
6098 | break; | |
6099 | case uprobe2_type: | |
6100 | clog << "uprobe2 at 0x" << hex << pc << dec << endl; | |
6101 | break; | |
40fe32e0 SC |
6102 | case uprobe3_type: |
6103 | clog << "uprobe3 at 0x" << hex << pc << dec << endl; | |
6104 | break; | |
c57ea854 SC |
6105 | case kprobe1_type: |
6106 | clog << "kprobe1" << endl; | |
6107 | break; | |
6108 | case kprobe2_type: | |
6109 | clog << "kprobe2" << endl; | |
6110 | break; | |
d61ea602 JS |
6111 | default: |
6112 | clog << "unknown!" << endl; | |
6113 | break; | |
c57ea854 SC |
6114 | } |
6115 | } | |
edce5b67 | 6116 | |
c57ea854 SC |
6117 | // Extend the derivation chain |
6118 | probe *new_base = convert_location(); | |
6119 | probe_point *new_location = new_base->locations[0]; | |
6120 | ||
c57ea854 SC |
6121 | bool need_debug_info = false; |
6122 | ||
7d395255 JS |
6123 | // We could get the Elf* from either dwarf_getelf(dwfl_module_getdwarf(...)) |
6124 | // or dwfl_module_getelf(...). We only need it for the machine type, which | |
6125 | // should be the same. The bias is used for relocating debuginfoless probes, | |
6126 | // though, so that must come from the possibly-prelinked ELF file, not DWARF. | |
c57ea854 | 6127 | Dwarf_Addr bias; |
7d395255 | 6128 | Elf* elf = dwfl_module_getelf (dw.mod_info->mod, &bias); |
c57ea854 SC |
6129 | |
6130 | if (have_kprobe()) | |
edce5b67 | 6131 | { |
c57ea854 | 6132 | convert_probe(new_base); |
c57ea854 SC |
6133 | // Expand the local variables in the probe body |
6134 | sdt_kprobe_var_expanding_visitor svv (module_val, | |
6135 | provider_name, | |
6136 | probe_name, | |
6137 | arg_string, | |
6138 | arg_count); | |
6139 | svv.replace (new_base->body); | |
6140 | } | |
6141 | else | |
6142 | { | |
6143 | /* Figure out the architecture of this particular ELF file. | |
6144 | The dwarfless register-name mappings depend on it. */ | |
6145 | GElf_Ehdr ehdr_mem; | |
6146 | GElf_Ehdr* em = gelf_getehdr (elf, &ehdr_mem); | |
6147 | if (em == 0) { dwfl_assert ("dwfl_getehdr", dwfl_errno()); } | |
6148 | int elf_machine = em->e_machine; | |
6149 | sdt_uprobe_var_expanding_visitor svv (sess, elf_machine, | |
6150 | module_val, | |
6151 | provider_name, | |
6152 | probe_name, | |
71e5e13d | 6153 | probe_type, |
c57ea854 SC |
6154 | arg_string, |
6155 | arg_count); | |
6156 | svv.replace (new_base->body); | |
6157 | need_debug_info = svv.need_debug_info; | |
6158 | } | |
6159 | ||
6160 | unsigned i = results.size(); | |
edce5b67 | 6161 | |
c57ea854 SC |
6162 | if (have_kprobe()) |
6163 | derive_probes(sess, new_base, results); | |
6164 | ||
6165 | else | |
6166 | { | |
6167 | // XXX: why not derive_probes() in the uprobes case too? | |
6168 | literal_map_t params; | |
6169 | for (unsigned i = 0; i < new_location->components.size(); ++i) | |
39a3e397 | 6170 | { |
c57ea854 SC |
6171 | probe_point::component *c = new_location->components[i]; |
6172 | params[c->functor] = c->arg; | |
39a3e397 | 6173 | } |
30263a73 | 6174 | |
c57ea854 SC |
6175 | dwarf_query q(new_base, new_location, dw, params, results, "", ""); |
6176 | q.has_mark = true; // enables mid-statement probing | |
edce5b67 | 6177 | |
c57ea854 SC |
6178 | // V2 probes need dwarf info in case of a variable reference |
6179 | if (have_debuginfo_uprobe(need_debug_info)) | |
6180 | dw.iterate_over_modules(&query_module, &q); | |
6181 | else if (have_debuginfoless_uprobe()) | |
aff5d390 | 6182 | { |
c57ea854 SC |
6183 | string section; |
6184 | Dwarf_Addr reloc_addr = q.statement_num_val + bias; | |
6185 | if (dwfl_module_relocations (q.dw.mod_info->mod) > 0) | |
6186 | { | |
6187 | dwfl_module_relocate_address (q.dw.mod_info->mod, &reloc_addr); | |
6188 | section = ".dynamic"; | |
6189 | } | |
6190 | else | |
6191 | section = ".absolute"; | |
6192 | ||
6193 | uprobe_derived_probe* p = | |
6194 | new uprobe_derived_probe ("", "", 0, q.module_val, section, | |
6195 | q.statement_num_val, reloc_addr, q, 0); | |
6196 | p->saveargs (arg_count); | |
6197 | results.push_back (p); | |
aff5d390 | 6198 | } |
c57ea854 | 6199 | } |
487bf4e2 | 6200 | sess.unwindsym_modules.insert (dw.module_name); |
c57ea854 SC |
6201 | record_semaphore(results, i); |
6202 | } | |
edce5b67 | 6203 | |
4ddb6dd0 | 6204 | |
c57ea854 SC |
6205 | void |
6206 | sdt_query::handle_query_module() | |
6207 | { | |
6208 | if (!init_probe_scn()) | |
6209 | return; | |
edce5b67 | 6210 | |
c57ea854 SC |
6211 | if (sess.verbose > 3) |
6212 | clog << "TOK_MARK: " << pp_mark << " TOK_PROVIDER: " << pp_provider << endl; | |
edce5b67 | 6213 | |
40fe32e0 SC |
6214 | if (probe_loc == note_section) |
6215 | { | |
6216 | GElf_Shdr shdr_mem; | |
6217 | GElf_Shdr *shdr = dw.get_section (".stapsdt.base", &shdr_mem); | |
6218 | ||
6219 | if (shdr) | |
6220 | base = shdr->sh_addr; | |
6221 | else | |
6222 | base = 0; | |
6223 | dw.iterate_over_notes ((void*) this, &sdt_query::setup_note_probe_entry_callback); | |
6224 | } | |
d61ea602 | 6225 | else if (probe_loc == probe_section) |
40fe32e0 | 6226 | iterate_over_probe_entries (); |
edce5b67 JS |
6227 | } |
6228 | ||
6229 | ||
6230 | bool | |
6231 | sdt_query::init_probe_scn() | |
6232 | { | |
448a86b7 | 6233 | Elf* elf; |
edce5b67 | 6234 | GElf_Shdr shdr_mem; |
40fe32e0 SC |
6235 | |
6236 | GElf_Shdr *shdr = dw.get_section (".note.stapsdt", &shdr_mem); | |
6237 | if (shdr) | |
6238 | { | |
6239 | probe_loc = note_section; | |
6240 | return true; | |
6241 | } | |
edce5b67 | 6242 | |
448a86b7 | 6243 | shdr = dw.get_section (".probes", &shdr_mem, &elf); |
fea74777 | 6244 | if (shdr) |
edce5b67 | 6245 | { |
fea74777 SC |
6246 | pdata = elf_getdata_rawchunk (elf, shdr->sh_offset, shdr->sh_size, ELF_T_BYTE); |
6247 | probe_scn_offset = 0; | |
6248 | probe_scn_addr = shdr->sh_addr; | |
6249 | assert (pdata != NULL); | |
6250 | if (sess.verbose > 4) | |
ce0f6648 LB |
6251 | clog << "got .probes elf scn_addr@0x" << probe_scn_addr << ", size: " |
6252 | << pdata->d_size << endl; | |
40fe32e0 | 6253 | probe_loc = probe_section; |
fea74777 | 6254 | return true; |
edce5b67 | 6255 | } |
fea74777 | 6256 | else |
edce5b67 | 6257 | return false; |
edce5b67 JS |
6258 | } |
6259 | ||
40fe32e0 SC |
6260 | void |
6261 | sdt_query::setup_note_probe_entry_callback (void *object, int type, const char *data, size_t len) | |
6262 | { | |
6263 | sdt_query *me = (sdt_query*)object; | |
6264 | me->setup_note_probe_entry (type, data, len); | |
6265 | } | |
6266 | ||
6267 | ||
6268 | void | |
6269 | sdt_query::setup_note_probe_entry (int type, const char *data, size_t len) | |
6270 | { | |
6271 | // if (nhdr.n_namesz == sizeof _SDT_NOTE_NAME | |
6272 | // && !memcmp (data->d_buf + name_off, | |
6273 | // _SDT_NOTE_NAME, sizeof _SDT_NOTE_NAME)) | |
6274 | ||
6275 | // probes are in the .note.stapsdt section | |
6276 | #define _SDT_NOTE_TYPE 3 | |
6277 | if (type != _SDT_NOTE_TYPE) | |
6278 | return; | |
6279 | ||
6280 | union | |
6281 | { | |
6282 | Elf64_Addr a64[3]; | |
6283 | Elf32_Addr a32[3]; | |
6284 | } buf; | |
6285 | Dwarf_Addr bias; | |
6286 | Elf* elf = (dwfl_module_getelf (dw.mod_info->mod, &bias)); | |
6287 | Elf_Data dst = | |
6288 | { | |
6289 | &buf, ELF_T_ADDR, EV_CURRENT, | |
6290 | gelf_fsize (elf, ELF_T_ADDR, 3, EV_CURRENT), 0, 0 | |
6291 | }; | |
6292 | assert (dst.d_size <= sizeof buf); | |
6293 | ||
6294 | if (len < dst.d_size + 3) | |
6295 | return; | |
6296 | ||
6297 | Elf_Data src = | |
6298 | { | |
6299 | (void *) data, ELF_T_ADDR, EV_CURRENT, | |
6300 | dst.d_size, 0, 0 | |
6301 | }; | |
6302 | ||
6303 | if (gelf_xlatetom (elf, &dst, &src, | |
6304 | elf_getident (elf, NULL)[EI_DATA]) == NULL) | |
6305 | printf ("gelf_xlatetom: %s", elf_errmsg (-1)); | |
6306 | ||
6307 | probe_type = uprobe3_type; | |
6308 | const char * provider = data + dst.d_size; | |
6309 | provider_name = provider; | |
6310 | const char *name = (const char*)memchr (provider, '\0', data + len - provider); | |
6311 | probe_name = ++name; | |
6312 | ||
6313 | // Did we find a matching probe? | |
6314 | if (! (dw.function_name_matches_pattern (probe_name, pp_mark) | |
6315 | && ((pp_provider == "") | |
6316 | || dw.function_name_matches_pattern (provider_name, pp_provider)))) | |
6317 | return; | |
6318 | ||
6319 | const char *args = (const char*)memchr (name, '\0', data + len - name); | |
6320 | if (args++ == NULL || | |
6321 | memchr (args, '\0', data + len - name) != data + len - 1) | |
6322 | if (name == NULL) | |
6323 | return; | |
6324 | arg_string = args; | |
6325 | ||
6326 | arg_count = 0; | |
6327 | for (unsigned i = 0; i < arg_string.length(); i++) | |
272c9036 | 6328 | if (arg_string[i] == '@') |
40fe32e0 | 6329 | arg_count += 1; |
40fe32e0 SC |
6330 | |
6331 | GElf_Addr base_ref; | |
6332 | if (gelf_getclass (elf) == ELFCLASS32) | |
6333 | { | |
6334 | pc = buf.a32[0]; | |
6335 | base_ref = buf.a32[1]; | |
6336 | semaphore = buf.a32[2]; | |
6337 | } | |
6338 | else | |
6339 | { | |
6340 | pc = buf.a64[0]; | |
6341 | base_ref = buf.a64[1]; | |
6342 | semaphore = buf.a64[2]; | |
6343 | } | |
6344 | ||
6345 | semaphore += base - base_ref; | |
6346 | pc += base - base_ref; | |
6347 | ||
7d395255 JS |
6348 | // The semaphore also needs the ELF bias added now, so |
6349 | // record_semaphore can properly relocate it later. | |
6350 | semaphore += bias; | |
6351 | ||
40fe32e0 | 6352 | if (sess.verbose > 4) |
b530b5b3 | 6353 | 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 |
6354 | |
6355 | handle_probe_entry(); | |
6356 | } | |
6357 | ||
6358 | ||
c57ea854 SC |
6359 | void |
6360 | sdt_query::iterate_over_probe_entries() | |
edce5b67 | 6361 | { |
c57ea854 | 6362 | // probes are in the .probe section |
edce5b67 JS |
6363 | while (probe_scn_offset < pdata->d_size) |
6364 | { | |
aff5d390 SC |
6365 | stap_sdt_probe_entry_v1 *pbe_v1 = (stap_sdt_probe_entry_v1 *) ((char*)pdata->d_buf + probe_scn_offset); |
6366 | stap_sdt_probe_entry_v2 *pbe_v2 = (stap_sdt_probe_entry_v2 *) ((char*)pdata->d_buf + probe_scn_offset); | |
15284963 | 6367 | probe_type = (stap_sdt_probe_type)(pbe_v1->type_a); |
aff5d390 | 6368 | if (! have_uprobe() && ! have_kprobe()) |
edce5b67 JS |
6369 | { |
6370 | // Unless this is a mangled .probes section, this happens | |
6371 | // because the name of the probe comes first, followed by | |
6372 | // the sentinel. | |
6373 | if (sess.verbose > 5) | |
b530b5b3 | 6374 | clog << _F("got unknown probe_type : 0x%x", probe_type) << endl; |
edce5b67 JS |
6375 | probe_scn_offset += sizeof(__uint32_t); |
6376 | continue; | |
6377 | } | |
aff5d390 SC |
6378 | if ((long)pbe_v1 % sizeof(__uint64_t)) // we have stap_sdt_probe_entry_v1.type_b |
6379 | { | |
6380 | pbe_v1 = (stap_sdt_probe_entry_v1*)((char*)pbe_v1 - sizeof(__uint32_t)); | |
6381 | if (pbe_v1->type_b != uprobe1_type && pbe_v1->type_b != kprobe1_type) | |
6382 | continue; | |
6383 | } | |
6384 | ||
6385 | if (probe_type == uprobe1_type || probe_type == kprobe1_type) | |
6386 | { | |
79a0ca08 | 6387 | if (pbe_v1->name == 0) // No name possibly means we have a .so with a relocation |
c57ea854 | 6388 | return; |
79a0ca08 | 6389 | semaphore = 0; |
aff5d390 | 6390 | probe_name = (char*)((char*)pdata->d_buf + pbe_v1->name - (char*)probe_scn_addr); |
a794dbeb | 6391 | provider_name = ""; // unknown |
aff5d390 SC |
6392 | if (probe_type == uprobe1_type) |
6393 | { | |
6394 | pc = pbe_v1->arg; | |
6395 | arg_count = 0; | |
6396 | } | |
6397 | else if (probe_type == kprobe1_type) | |
6398 | arg_count = pbe_v1->arg; | |
6399 | probe_scn_offset += sizeof (stap_sdt_probe_entry_v1); | |
6400 | } | |
6401 | else if (probe_type == uprobe2_type || probe_type == kprobe2_type) | |
6402 | { | |
79a0ca08 | 6403 | if (pbe_v2->name == 0) // No name possibly means we have a .so with a relocation |
c57ea854 | 6404 | return; |
79a0ca08 | 6405 | semaphore = pbe_v2->semaphore; |
aff5d390 | 6406 | probe_name = (char*)((char*)pdata->d_buf + pbe_v2->name - (char*)probe_scn_addr); |
a794dbeb | 6407 | provider_name = (char*)((char*)pdata->d_buf + pbe_v2->provider - (char*)probe_scn_addr); |
aff5d390 SC |
6408 | arg_count = pbe_v2->arg_count; |
6409 | pc = pbe_v2->pc; | |
6410 | if (pbe_v2->arg_string) | |
6411 | arg_string = (char*)((char*)pdata->d_buf + pbe_v2->arg_string - (char*)probe_scn_addr); | |
79a0ca08 SC |
6412 | // skip over pbe_v2, probe_name text and provider text |
6413 | probe_scn_offset = ((long)(pbe_v2->name) - (long)(probe_scn_addr)) + probe_name.length(); | |
6414 | probe_scn_offset += sizeof (__uint32_t) - probe_scn_offset % sizeof (__uint32_t); | |
aff5d390 | 6415 | } |
edce5b67 | 6416 | if (sess.verbose > 4) |
b530b5b3 | 6417 | clog << _("saw .probes ") << probe_name << (provider_name != "" ? _(" (provider ")+provider_name+") " : "") |
aff5d390 | 6418 | << "@0x" << hex << pc << dec << endl; |
edce5b67 | 6419 | |
a794dbeb FCE |
6420 | if (dw.function_name_matches_pattern (probe_name, pp_mark) |
6421 | && ((pp_provider == "") || dw.function_name_matches_pattern (provider_name, pp_provider))) | |
c57ea854 | 6422 | handle_probe_entry (); |
edce5b67 | 6423 | } |
edce5b67 JS |
6424 | } |
6425 | ||
6426 | ||
6846cfc8 | 6427 | void |
4ddb6dd0 | 6428 | sdt_query::record_semaphore (vector<derived_probe *> & results, unsigned start) |
6846cfc8 | 6429 | { |
a794dbeb FCE |
6430 | for (unsigned i=0; i<2; i++) { |
6431 | // prefer with-provider symbol; look without provider prefix for backward compatibility only | |
6432 | string semaphore = (i==0 ? (provider_name+"_") : "") + probe_name + "_semaphore"; | |
6433 | // XXX: multiple addresses? | |
6434 | if (sess.verbose > 2) | |
b530b5b3 | 6435 | clog << _F("looking for semaphore symbol %s ", semaphore.c_str()); |
a794dbeb | 6436 | |
79a0ca08 SC |
6437 | Dwarf_Addr addr; |
6438 | if (this->semaphore) | |
6439 | addr = this->semaphore; | |
6440 | else | |
6441 | addr = lookup_symbol_address(dw.module, semaphore.c_str()); | |
a794dbeb FCE |
6442 | if (addr) |
6443 | { | |
7d395255 | 6444 | if (dwfl_module_relocations (dw.module) > 0) |
a794dbeb FCE |
6445 | dwfl_module_relocate_address (dw.module, &addr); |
6446 | // XXX: relocation basis? | |
6447 | for (unsigned i = start; i < results.size(); ++i) | |
6448 | results[i]->sdt_semaphore_addr = addr; | |
6449 | if (sess.verbose > 2) | |
b530b5b3 | 6450 | clog << _(", found at 0x") << hex << addr << dec << endl; |
a794dbeb FCE |
6451 | return; |
6452 | } | |
6453 | else | |
6454 | if (sess.verbose > 2) | |
b530b5b3 | 6455 | clog << _(", not found") << endl; |
a794dbeb | 6456 | } |
6846cfc8 SC |
6457 | } |
6458 | ||
6459 | ||
edce5b67 JS |
6460 | void |
6461 | sdt_query::convert_probe (probe *base) | |
6462 | { | |
6463 | block *b = new block; | |
6464 | b->tok = base->body->tok; | |
6465 | ||
6466 | // XXX: Does this also need to happen for i386 under x86_64 stap? | |
ebbd2b45 | 6467 | if (sess.architecture == "i386" && have_kprobe()) |
edce5b67 JS |
6468 | { |
6469 | functioncall *rp = new functioncall; | |
edce5b67 JS |
6470 | rp->function = "regparm"; |
6471 | rp->tok = b->tok; | |
6472 | literal_number* littid = new literal_number(0); | |
6473 | littid->tok = b->tok; | |
6474 | rp->args.push_back(littid); | |
6475 | expr_statement* es = new expr_statement; | |
6476 | es->tok = b->tok; | |
6477 | es->value = rp; | |
6478 | b->statements.push_back(es); | |
6479 | } | |
edce5b67 | 6480 | |
aff5d390 | 6481 | if (have_kprobe()) |
edce5b67 | 6482 | { |
aff5d390 | 6483 | // Generate: if (arg2 != kprobe2_type) next; |
edce5b67 JS |
6484 | if_statement *istid = new if_statement; |
6485 | istid->thenblock = new next_statement; | |
6486 | istid->elseblock = NULL; | |
6487 | istid->tok = b->tok; | |
63ea4244 | 6488 | istid->thenblock->tok = b->tok; |
edce5b67 JS |
6489 | comparison *betid = new comparison; |
6490 | betid->op = "!="; | |
6491 | betid->tok = b->tok; | |
6492 | ||
6493 | functioncall *arg2 = new functioncall; | |
6494 | arg2->function = "ulong_arg"; | |
6495 | arg2->tok = b->tok; | |
6496 | literal_number* num = new literal_number(2); | |
6497 | num->tok = b->tok; | |
6498 | arg2->args.push_back(num); | |
6499 | ||
6500 | betid->left = arg2; | |
aff5d390 | 6501 | literal_number* littid = new literal_number(probe_type); |
edce5b67 JS |
6502 | littid->tok = b->tok; |
6503 | betid->right = littid; | |
6504 | istid->condition = betid; | |
6505 | b->statements.push_back(istid); | |
6506 | } | |
6507 | ||
6508 | // Generate: if (arg1 != mark("label")) next; | |
6509 | functioncall *fc = new functioncall; | |
bbafcb1e | 6510 | fc->function = "ulong_arg"; |
edce5b67 | 6511 | fc->tok = b->tok; |
bbafcb1e | 6512 | literal_number* num = new literal_number(1); |
edce5b67 JS |
6513 | num->tok = b->tok; |
6514 | fc->args.push_back(num); | |
6515 | ||
6516 | functioncall *fcus = new functioncall; | |
6517 | fcus->function = "user_string"; | |
6518 | fcus->type = pe_string; | |
6519 | fcus->tok = b->tok; | |
6520 | fcus->args.push_back(fc); | |
6521 | ||
6522 | if_statement *is = new if_statement; | |
6523 | is->thenblock = new next_statement; | |
6524 | is->elseblock = NULL; | |
6525 | is->tok = b->tok; | |
63ea4244 | 6526 | is->thenblock->tok = b->tok; |
edce5b67 JS |
6527 | comparison *be = new comparison; |
6528 | be->op = "!="; | |
6529 | be->tok = b->tok; | |
6530 | be->left = fcus; | |
6531 | be->right = new literal_string(probe_name); | |
63ea4244 | 6532 | be->right->tok = b->tok; |
edce5b67 JS |
6533 | is->condition = be; |
6534 | b->statements.push_back(is); | |
6535 | ||
6536 | // Now replace the body | |
6537 | b->statements.push_back(base->body); | |
6538 | base->body = b; | |
6539 | } | |
6540 | ||
6541 | ||
c72aa911 JS |
6542 | probe* |
6543 | sdt_query::convert_location () | |
edce5b67 | 6544 | { |
c72aa911 | 6545 | probe_point* specific_loc = new probe_point(*base_loc); |
662539d9 | 6546 | vector<probe_point::component*> derived_comps; |
edce5b67 | 6547 | |
662539d9 JS |
6548 | vector<probe_point::component*>::iterator it; |
6549 | for (it = specific_loc->components.begin(); | |
6550 | it != specific_loc->components.end(); ++it) | |
6551 | if ((*it)->functor == TOK_PROCESS) | |
6552 | { | |
6553 | if (have_kprobe()) | |
6554 | // start the kernel probe_point | |
6555 | derived_comps.push_back(new probe_point::component(TOK_KERNEL)); | |
6556 | else | |
6557 | // copy the process name | |
6558 | derived_comps.push_back(*it); | |
6559 | } | |
6560 | else if ((*it)->functor == TOK_LIBRARY) | |
6561 | { | |
6562 | if (!have_kprobe()) | |
6563 | // copy the library name for process probes | |
6564 | derived_comps.push_back(*it); | |
6565 | } | |
6566 | else if ((*it)->functor == TOK_PROVIDER) | |
6567 | { | |
6568 | // replace the possibly wildcarded arg with the specific provider name | |
6569 | *it = new probe_point::component(TOK_PROVIDER, | |
6570 | new literal_string(provider_name)); | |
6571 | } | |
6572 | else if ((*it)->functor == TOK_MARK) | |
c72aa911 JS |
6573 | { |
6574 | // replace the possibly wildcarded arg with the specific marker name | |
662539d9 JS |
6575 | *it = new probe_point::component(TOK_MARK, |
6576 | new literal_string(probe_name)); | |
a794dbeb | 6577 | |
aff5d390 SC |
6578 | if (sess.verbose > 3) |
6579 | switch (probe_type) | |
6580 | { | |
6581 | case uprobe1_type: | |
b530b5b3 | 6582 | clog << _("probe_type == uprobe1, use statement addr: 0x") |
aff5d390 SC |
6583 | << hex << pc << dec << endl; |
6584 | break; | |
6585 | case uprobe2_type: | |
b530b5b3 | 6586 | clog << _("probe_type == uprobe2, use statement addr: 0x") |
aff5d390 SC |
6587 | << hex << pc << dec << endl; |
6588 | break; | |
40fe32e0 | 6589 | case uprobe3_type: |
b530b5b3 | 6590 | clog << _("probe_type == uprobe3, use statement addr: 0x") |
40fe32e0 SC |
6591 | << hex << pc << dec << endl; |
6592 | break; | |
6593 | case kprobe1_type: | |
6594 | clog << "probe_type == kprobe1" << endl; | |
6595 | break; | |
6596 | case kprobe2_type: | |
6597 | clog << "probe_type == kprobe2" << endl; | |
6598 | break; | |
aff5d390 | 6599 | default: |
b530b5b3 LB |
6600 | clog << _F("probe_type == use_uprobe_no_dwarf, use label name: _stapprobe1_%s", |
6601 | pp_mark.c_str()) << endl; | |
aff5d390 SC |
6602 | } |
6603 | ||
c72aa911 JS |
6604 | switch (probe_type) |
6605 | { | |
aff5d390 SC |
6606 | case uprobe1_type: |
6607 | case uprobe2_type: | |
40fe32e0 | 6608 | case uprobe3_type: |
c72aa911 | 6609 | // process("executable").statement(probe_arg) |
662539d9 JS |
6610 | derived_comps.push_back |
6611 | (new probe_point::component(TOK_STATEMENT, | |
6612 | new literal_number(pc, true))); | |
c72aa911 JS |
6613 | break; |
6614 | ||
aff5d390 SC |
6615 | case kprobe1_type: |
6616 | case kprobe2_type: | |
b642c901 | 6617 | // kernel.function("*getegid*") |
662539d9 JS |
6618 | derived_comps.push_back |
6619 | (new probe_point::component(TOK_FUNCTION, | |
6620 | new literal_string("*getegid*"))); | |
b642c901 | 6621 | break; |
c72aa911 | 6622 | |
a794dbeb | 6623 | default: // deprecated |
c72aa911 | 6624 | // process("executable").function("*").label("_stapprobe1_MARK_NAME") |
662539d9 JS |
6625 | derived_comps.push_back |
6626 | (new probe_point::component(TOK_FUNCTION, | |
6627 | new literal_string("*"))); | |
6628 | derived_comps.push_back | |
c72aa911 | 6629 | (new probe_point::component(TOK_LABEL, |
a794dbeb | 6630 | new literal_string("_stapprobe1_" + pp_mark))); |
c72aa911 JS |
6631 | break; |
6632 | } | |
6633 | } | |
edce5b67 | 6634 | |
662539d9 JS |
6635 | probe_point* derived_loc = new probe_point(*specific_loc); |
6636 | derived_loc->components = derived_comps; | |
c72aa911 | 6637 | return base_probe->create_alias(derived_loc, specific_loc); |
edce5b67 JS |
6638 | } |
6639 | ||
6640 | ||
51d6bda3 SC |
6641 | void |
6642 | sdt_query::query_library (const char *library) | |
6643 | { | |
6644 | query_one_library (library, dw, user_lib, base_probe, base_loc, results); | |
6645 | } | |
6646 | ||
6647 | ||
20c6c071 | 6648 | void |
5227f1ea | 6649 | dwarf_builder::build(systemtap_session & sess, |
7a053d3b | 6650 | probe * base, |
20c6c071 | 6651 | probe_point * location, |
86bf665e | 6652 | literal_map_t const & parameters, |
20c6c071 GH |
6653 | vector<derived_probe *> & finished_results) |
6654 | { | |
b20febf3 FCE |
6655 | // NB: the kernel/user dwlfpp objects are long-lived. |
6656 | // XXX: but they should be per-session, as this builder object | |
6657 | // may be reused if we try to cross-instrument multiple targets. | |
84048984 | 6658 | |
7a24d422 | 6659 | dwflpp* dw = 0; |
6d5d594e | 6660 | literal_map_t filled_parameters = parameters; |
7a24d422 | 6661 | |
7a24d422 | 6662 | string module_name; |
ae2552da FCE |
6663 | if (has_null_param (parameters, TOK_KERNEL)) |
6664 | { | |
6665 | dw = get_kern_dw(sess, "kernel"); | |
6666 | } | |
6667 | else if (get_param (parameters, TOK_MODULE, module_name)) | |
b8da0ad1 | 6668 | { |
c523a015 LB |
6669 | size_t dash_pos = 0; |
6670 | while((dash_pos=module_name.find('-'))!=string::npos) | |
6671 | module_name.replace(int(dash_pos),1,"_"); | |
6672 | filled_parameters[TOK_MODULE] = new literal_string(module_name); | |
37001baa FCE |
6673 | // NB: glob patterns get expanded later, during the offline |
6674 | // elfutils module listing. | |
ae2552da | 6675 | dw = get_kern_dw(sess, module_name); |
b8da0ad1 | 6676 | } |
6d5d594e | 6677 | else if (get_param (parameters, TOK_PROCESS, module_name) || has_null_param(parameters, TOK_PROCESS)) |
84c84ac4 | 6678 | { |
05fb3e0c | 6679 | module_name = sess.sysroot + module_name; |
6d5d594e LB |
6680 | if(has_null_param(filled_parameters, TOK_PROCESS)) |
6681 | { | |
6682 | wordexp_t words; | |
6683 | int rc = wordexp(sess.cmd.c_str(), &words, WRDE_NOCMD|WRDE_UNDEF); | |
6684 | if(rc || words.we_wordc <= 0) | |
6685 | throw semantic_error(_("unspecified process probe is invalid without a -c COMMAND")); | |
05fb3e0c | 6686 | module_name = sess.sysroot + words.we_wordv[0]; |
6d5d594e LB |
6687 | filled_parameters[TOK_PROCESS] = new literal_string(module_name);// this needs to be used in place of the blank map |
6688 | // in the case of TOK_MARK we need to modify locations as well | |
6689 | if(location->components[0]->functor==TOK_PROCESS && | |
6690 | location->components[0]->arg == 0) | |
6691 | location->components[0]->arg = new literal_string(module_name); | |
6692 | wordfree (& words); | |
6693 | } | |
5750ecc6 | 6694 | |
37001baa FCE |
6695 | // PR6456 process("/bin/*") glob handling |
6696 | if (contains_glob_chars (module_name)) | |
6697 | { | |
6698 | // Expand glob via rewriting the probe-point process("....") | |
6699 | // parameter, asserted to be the first one. | |
6700 | ||
6701 | assert (location->components.size() > 0); | |
6702 | assert (location->components[0]->functor == TOK_PROCESS); | |
6703 | assert (location->components[0]->arg); | |
6704 | literal_string* lit = dynamic_cast<literal_string*>(location->components[0]->arg); | |
6705 | assert (lit); | |
6706 | ||
6707 | // Evaluate glob here, and call derive_probes recursively with each match. | |
6708 | glob_t the_blob; | |
6709 | int rc = glob (module_name.c_str(), 0, NULL, & the_blob); | |
b530b5b3 LB |
6710 | if (rc) |
6711 | throw semantic_error (_F("glob %s error (%s)", module_name.c_str(), lex_cast(rc).c_str() )); | |
37001baa FCE |
6712 | for (unsigned i = 0; i < the_blob.gl_pathc; ++i) |
6713 | { | |
6714 | if (pending_interrupts) return; | |
6715 | ||
6716 | const char* globbed = the_blob.gl_pathv[i]; | |
6717 | struct stat st; | |
6718 | ||
6719 | if (access (globbed, X_OK) == 0 | |
6720 | && stat (globbed, &st) == 0 | |
6721 | && S_ISREG (st.st_mode)) // see find_executable() | |
6722 | { | |
7977a734 FCE |
6723 | // Need to call canonicalize here, in order to path-expand |
6724 | // patterns like process("stap*"). Otherwise it may go through | |
6725 | // to the next round of expansion as ("stap"), leading to a $PATH | |
6726 | // search that's not consistent with the glob search already done. | |
6727 | ||
6728 | char *cf = canonicalize_file_name (globbed); | |
6729 | if (cf) globbed = cf; | |
6730 | ||
37001baa FCE |
6731 | // synthesize a new probe_point, with the glob-expanded string |
6732 | probe_point *pp = new probe_point (*location); | |
5750ecc6 FCE |
6733 | // PR13338: quote results to prevent recursion |
6734 | string eglobbed = escape_glob_chars (globbed); | |
6735 | ||
6736 | if (sess.verbose > 1) | |
6737 | clog << _F("Expanded process(\"%s\") to process(\"%s\")", | |
6738 | module_name.c_str(), eglobbed.c_str()) << endl; | |
05fb3e0c | 6739 | string eglobbed_tgt = path_remove_sysroot(sess, eglobbed); |
5750ecc6 | 6740 | |
37001baa | 6741 | probe_point::component* ppc = new probe_point::component (TOK_PROCESS, |
05fb3e0c | 6742 | new literal_string (eglobbed_tgt)); |
37001baa FCE |
6743 | ppc->tok = location->components[0]->tok; // overwrite [0] slot, pattern matched above |
6744 | pp->components[0] = ppc; | |
6745 | ||
7977a734 FCE |
6746 | probe* new_probe = new probe (*base, pp); |
6747 | ||
6748 | // We override "optional = true" here, as if the | |
6749 | // wildcarded probe point was given a "?" suffix. | |
6750 | ||
6751 | // This is because wildcard probes will be expected | |
6752 | // by users to apply only to some subset of the | |
6753 | // matching binaries, in the sense of "any", rather | |
6754 | // than "all", sort of similarly how | |
6755 | // module("*").function("...") patterns work. | |
6756 | ||
6757 | derive_probes (sess, new_probe, finished_results, | |
6758 | true /* NB: not location->optional */ ); | |
37001baa FCE |
6759 | } |
6760 | } | |
6761 | ||
6762 | globfree (& the_blob); | |
6763 | return; // avoid falling through | |
6764 | } | |
6765 | ||
5750ecc6 FCE |
6766 | // PR13338: unquote glob results |
6767 | module_name = unescape_glob_chars (module_name); | |
05fb3e0c | 6768 | user_path = find_executable (module_name, "", sess.sysenv); // canonicalize it |
d1bcbe71 RH |
6769 | |
6770 | // if the executable starts with "#!", we look for the interpreter of the script | |
6771 | { | |
6772 | ifstream script_file (user_path.c_str () ); | |
6773 | ||
6774 | if (script_file.good ()) | |
6775 | { | |
6776 | string line; | |
6777 | ||
6778 | getline (script_file, line); | |
6779 | ||
6780 | if (line.compare (0, 2, "#!") == 0) | |
6781 | { | |
6782 | string path_head = line.substr(2); | |
6783 | ||
6784 | // remove white spaces at the beginning of the string | |
6785 | size_t p2 = path_head.find_first_not_of(" \t"); | |
6786 | ||
6787 | if (p2 != string::npos) | |
6788 | { | |
6789 | string path = path_head.substr(p2); | |
6790 | ||
6791 | // remove white spaces at the end of the string | |
6792 | p2 = path.find_last_not_of(" \t\n"); | |
6793 | if (string::npos != p2) | |
6794 | path.erase(p2+1); | |
6795 | ||
8e13c1a1 RH |
6796 | // handle "#!/usr/bin/env" redirect |
6797 | size_t offset = 0; | |
6798 | if (path.compare(0, sizeof("/bin/env")-1, "/bin/env") == 0) | |
6799 | { | |
6800 | offset = sizeof("/bin/env")-1; | |
6801 | } | |
6802 | else if (path.compare(0, sizeof("/usr/bin/env")-1, "/usr/bin/env") == 0) | |
6803 | { | |
6804 | offset = sizeof("/usr/bin/env")-1; | |
6805 | } | |
6806 | ||
6807 | if (offset != 0) | |
6808 | { | |
6809 | size_t p3 = path.find_first_not_of(" \t", offset); | |
6810 | ||
6811 | if (p3 != string::npos) | |
6812 | { | |
6813 | string env_path = path.substr(p3); | |
05fb3e0c WF |
6814 | user_path = find_executable (env_path, sess.sysroot, |
6815 | sess.sysenv); | |
8e13c1a1 RH |
6816 | } |
6817 | } | |
6818 | else | |
6819 | { | |
05fb3e0c | 6820 | user_path = find_executable (path, sess.sysroot, sess.sysenv); |
8e13c1a1 | 6821 | } |
d1bcbe71 RH |
6822 | |
6823 | struct stat st; | |
6824 | ||
6825 | if (access (user_path.c_str(), X_OK) == 0 | |
6826 | && stat (user_path.c_str(), &st) == 0 | |
6827 | && S_ISREG (st.st_mode)) // see find_executable() | |
6828 | { | |
6829 | if (sess.verbose > 1) | |
b530b5b3 LB |
6830 | clog << _F("Expanded process(\"%s\") to process(\"%s\")", |
6831 | module_name.c_str(), user_path.c_str()) << endl; | |
d1bcbe71 RH |
6832 | |
6833 | assert (location->components.size() > 0); | |
6834 | assert (location->components[0]->functor == TOK_PROCESS); | |
6835 | assert (location->components[0]->arg); | |
6836 | literal_string* lit = dynamic_cast<literal_string*>(location->components[0]->arg); | |
6837 | assert (lit); | |
6838 | ||
6839 | // synthesize a new probe_point, with the expanded string | |
6840 | probe_point *pp = new probe_point (*location); | |
05fb3e0c | 6841 | string user_path_tgt = path_remove_sysroot(sess, user_path); |
d1bcbe71 | 6842 | probe_point::component* ppc = new probe_point::component (TOK_PROCESS, |
05fb3e0c | 6843 | new literal_string (user_path_tgt.c_str())); |
d1bcbe71 RH |
6844 | ppc->tok = location->components[0]->tok; // overwrite [0] slot, pattern matched above |
6845 | pp->components[0] = ppc; | |
6846 | ||
6847 | probe* new_probe = new probe (*base, pp); | |
6848 | ||
6849 | derive_probes (sess, new_probe, finished_results); | |
6850 | ||
6851 | script_file.close(); | |
6852 | return; | |
6853 | } | |
6854 | } | |
6855 | } | |
6856 | } | |
6857 | script_file.close(); | |
6858 | } | |
6859 | ||
47e226ed | 6860 | if (get_param (parameters, TOK_LIBRARY, user_lib) |
378d78b5 | 6861 | && user_lib.length() && ! contains_glob_chars (user_lib)) |
47e226ed SC |
6862 | { |
6863 | module_name = find_executable (user_lib, sess.sysroot, sess.sysenv, | |
6864 | "LD_LIBRARY_PATH"); | |
6865 | if (module_name.find('/') == string::npos) | |
6866 | // We didn't find user_lib so use iterate_over_libraries | |
6867 | module_name = user_path; | |
6868 | } | |
63b4fd14 | 6869 | else |
b642c901 | 6870 | module_name = user_path; // canonicalize it |
d0a7f5a9 | 6871 | |
2b69faaf JS |
6872 | if (kernel_supports_inode_uprobes(sess)) |
6873 | { | |
64e807c2 | 6874 | // XXX: autoconf this? |
2b69faaf JS |
6875 | if (has_null_param(parameters, TOK_RETURN)) |
6876 | throw semantic_error | |
6877 | (_("process return probes not available with inode-based uprobes")); | |
6878 | } | |
f4000852 MW |
6879 | // There is a similar check in pass 4 (buildrun), but it is |
6880 | // needed here too to make sure alternatives for optional | |
6881 | // (? or !) process probes are disposed and/or alternatives | |
6882 | // are selected. | |
5261f7ab | 6883 | check_process_probe_kernel_support(sess); |
e34d5d13 | 6884 | |
7a24d422 FCE |
6885 | // user-space target; we use one dwflpp instance per module name |
6886 | // (= program or shared library) | |
707bf35e | 6887 | dw = get_user_dw(sess, module_name); |
c8959a29 | 6888 | } |
20c6c071 | 6889 | |
5896cd05 | 6890 | if (sess.verbose > 3) |
b530b5b3 | 6891 | clog << _F("dwarf_builder::build for %s", module_name.c_str()) << endl; |
5896cd05 | 6892 | |
a794dbeb FCE |
6893 | string dummy_mark_name; // NB: PR10245: dummy value, need not substitute - => __ |
6894 | if (get_param(parameters, TOK_MARK, dummy_mark_name)) | |
f28a8c28 | 6895 | { |
51d6bda3 | 6896 | sdt_query sdtq(base, location, *dw, filled_parameters, finished_results, user_lib); |
edce5b67 JS |
6897 | dw->iterate_over_modules(&query_module, &sdtq); |
6898 | return; | |
7a05f484 | 6899 | } |
20c6c071 | 6900 | |
8f14e444 | 6901 | unsigned results_pre = finished_results.size(); |
6d5d594e | 6902 | dwarf_query q(base, location, *dw, filled_parameters, finished_results, user_path, user_lib); |
7a24d422 FCE |
6903 | |
6904 | // XXX: kernel.statement.absolute is a special case that requires no | |
6905 | // dwfl processing. This code should be in a separate builder. | |
7a24d422 | 6906 | if (q.has_kernel && q.has_absolute) |
37ebca01 | 6907 | { |
4baf0e53 | 6908 | // assert guru mode for absolute probes |
37ebca01 FCE |
6909 | if (! q.base_probe->privileged) |
6910 | { | |
e3bbc038 | 6911 | throw semantic_error (_("absolute statement probe in unprivileged script; need stap -g"), |
edce5b67 | 6912 | q.base_probe->tok); |
37ebca01 FCE |
6913 | } |
6914 | ||
6915 | // For kernel.statement(NUM).absolute probe points, we bypass | |
6916 | // all the debuginfo stuff: We just wire up a | |
6917 | // dwarf_derived_probe right here and now. | |
4baf0e53 | 6918 | dwarf_derived_probe* p = |
b8da0ad1 FCE |
6919 | new dwarf_derived_probe ("", "", 0, "kernel", "", |
6920 | q.statement_num_val, q.statement_num_val, | |
6921 | q, 0); | |
37ebca01 | 6922 | finished_results.push_back (p); |
1a0dbc5a | 6923 | sess.unwindsym_modules.insert ("kernel"); |
37ebca01 FCE |
6924 | return; |
6925 | } | |
6926 | ||
51178501 | 6927 | dw->iterate_over_modules(&query_module, &q); |
8f14e444 FCE |
6928 | |
6929 | ||
6930 | // PR11553 special processing: .return probes requested, but | |
6931 | // some inlined function instances matched. | |
6932 | unsigned i_n_r = q.inlined_non_returnable.size(); | |
6933 | unsigned results_post = finished_results.size(); | |
6934 | if (i_n_r > 0) | |
6935 | { | |
6936 | if ((results_pre == results_post) && (! sess.suppress_warnings)) // no matches; issue warning | |
6937 | { | |
6938 | string quicklist; | |
6939 | for (set<string>::iterator it = q.inlined_non_returnable.begin(); | |
6940 | it != q.inlined_non_returnable.end(); | |
6941 | it++) | |
6942 | { | |
6943 | quicklist += " " + (*it); | |
6944 | if (quicklist.size() > 80) // heuristic, don't make an overlong report line | |
6945 | { | |
6946 | quicklist += " ..."; | |
6947 | break; | |
6948 | } | |
6949 | } | |
c57ea854 | 6950 | |
b530b5b3 LB |
6951 | sess.print_warning (_F(ngettext("cannot probe .return of %u inlined function %s", |
6952 | "cannot probe .return of %u inlined functions %s", | |
6953 | quicklist.size()), i_n_r, quicklist.c_str())); | |
8f14e444 FCE |
6954 | // There will be also a "no matches" semantic error generated. |
6955 | } | |
6956 | if (sess.verbose > 1) | |
b530b5b3 LB |
6957 | clog << _F(ngettext("skipped .return probe of %u inlined function", |
6958 | "skipped .return probe of %u inlined functions", i_n_r), i_n_r) << endl; | |
8f14e444 FCE |
6959 | if ((sess.verbose > 3) || (sess.verbose > 2 && results_pre == results_post)) // issue details with high verbosity |
6960 | { | |
6961 | for (set<string>::iterator it = q.inlined_non_returnable.begin(); | |
6962 | it != q.inlined_non_returnable.end(); | |
6963 | it++) | |
6964 | clog << (*it) << " "; | |
6965 | clog << endl; | |
6966 | } | |
6967 | } // i_n_r > 0 | |
5f0a03a6 JK |
6968 | } |
6969 | ||
6970 | symbol_table::~symbol_table() | |
6971 | { | |
c9efa5c9 | 6972 | delete_map(map_by_addr); |
5f0a03a6 JK |
6973 | } |
6974 | ||
6975 | void | |
2867a2a1 | 6976 | symbol_table::add_symbol(const char *name, bool weak, bool descriptor, |
822a6a3d | 6977 | Dwarf_Addr addr, Dwarf_Addr */*high_addr*/) |
5f0a03a6 | 6978 | { |
ab91b232 JK |
6979 | #ifdef __powerpc__ |
6980 | // Map ".sys_foo" to "sys_foo". | |
6981 | if (name[0] == '.') | |
6982 | name++; | |
6983 | #endif | |
5f0a03a6 JK |
6984 | func_info *fi = new func_info(); |
6985 | fi->addr = addr; | |
6986 | fi->name = name; | |
ab91b232 | 6987 | fi->weak = weak; |
2867a2a1 | 6988 | fi->descriptor = descriptor; |
5f0a03a6 JK |
6989 | map_by_name[fi->name] = fi; |
6990 | // TODO: Use a multimap in case there are multiple static | |
6991 | // functions with the same name? | |
1c6b77e5 | 6992 | map_by_addr.insert(make_pair(addr, fi)); |
5f0a03a6 JK |
6993 | } |
6994 | ||
6995 | enum info_status | |
6996 | symbol_table::read_symbols(FILE *f, const string& path) | |
6997 | { | |
6998 | // Based on do_kernel_symbols() in runtime/staprun/symbols.c | |
6999 | int ret; | |
2e67a43b TM |
7000 | char *name = 0; |
7001 | char *mod = 0; | |
5f0a03a6 JK |
7002 | char type; |
7003 | unsigned long long addr; | |
7004 | Dwarf_Addr high_addr = 0; | |
7005 | int line = 0; | |
7006 | ||
7007 | // %as (non-POSIX) mallocs space for the string and stores its address. | |
7008 | while ((ret = fscanf(f, "%llx %c %as [%as", &addr, &type, &name, &mod)) > 0) | |
7009 | { | |
2e67a43b TM |
7010 | auto_free free_name(name); |
7011 | auto_free free_mod(mod); | |
5f0a03a6 JK |
7012 | line++; |
7013 | if (ret < 3) | |
7014 | { | |
3d372d6b | 7015 | cerr << _F("Symbol table error: Line %d of symbol list from %s is not in correct format: address type name [module]\n", |
b530b5b3 | 7016 | line, path.c_str()); |
5f0a03a6 JK |
7017 | // Caller should delete symbol_table object. |
7018 | return info_absent; | |
7019 | } | |
2e67a43b | 7020 | else if (ret > 3) |
5f0a03a6 JK |
7021 | { |
7022 | // Modules are loaded above the kernel, so if we're getting | |
7023 | // modules, we're done. | |
2e67a43b | 7024 | break; |
5f0a03a6 | 7025 | } |
ab91b232 | 7026 | if (type == 'T' || type == 't' || type == 'W') |
2867a2a1 | 7027 | add_symbol(name, (type == 'W'), false, (Dwarf_Addr) addr, &high_addr); |
5f0a03a6 JK |
7028 | } |
7029 | ||
1c6b77e5 | 7030 | if (map_by_addr.size() < 1) |
5f0a03a6 | 7031 | { |
3d372d6b | 7032 | cerr << _F("Symbol table error: %s contains no function symbols.\n", |
b530b5b3 | 7033 | path.c_str()) << endl; |
5f0a03a6 JK |
7034 | return info_absent; |
7035 | } | |
7036 | return info_present; | |
7037 | } | |
7038 | ||
7039 | // NB: This currently unused. We use get_from_elf() instead because | |
7040 | // that gives us raw addresses -- which we need for modules -- whereas | |
7041 | // nm provides the address relative to the beginning of the section. | |
7042 | enum info_status | |
83ca3872 | 7043 | symbol_table::read_from_elf_file(const string &path, |
2713ea24 | 7044 | systemtap_session &sess) |
5f0a03a6 | 7045 | { |
58502ae4 JS |
7046 | vector<string> cmd; |
7047 | cmd.push_back("/usr/bin/nm"); | |
7048 | cmd.push_back("-n"); | |
7049 | cmd.push_back("--defined-only"); | |
7050 | cmd.push_back("path"); | |
7051 | ||
5f0a03a6 | 7052 | FILE *f; |
58502ae4 JS |
7053 | int child_fd; |
7054 | pid_t child = stap_spawn_piped(sess.verbose, cmd, NULL, &child_fd); | |
7055 | if (child <= 0 || !(f = fdopen(child_fd, "r"))) | |
5f0a03a6 | 7056 | { |
58502ae4 | 7057 | // nm failures are detected by stap_waitpid |
3d372d6b | 7058 | cerr << _F("Internal error reading symbol table from %s -- %s\n", |
b530b5b3 | 7059 | path.c_str(), strerror(errno)); |
5f0a03a6 JK |
7060 | return info_absent; |
7061 | } | |
7062 | enum info_status status = read_symbols(f, path); | |
58502ae4 | 7063 | if (fclose(f) || stap_waitpid(sess.verbose, child)) |
5f0a03a6 | 7064 | { |
2713ea24 CM |
7065 | if (status == info_present) |
7066 | sess.print_warning("nm cannot read symbol table from " + path); | |
5f0a03a6 JK |
7067 | return info_absent; |
7068 | } | |
7069 | return status; | |
7070 | } | |
7071 | ||
7072 | enum info_status | |
83ca3872 | 7073 | symbol_table::read_from_text_file(const string& path, |
2713ea24 | 7074 | systemtap_session &sess) |
5f0a03a6 JK |
7075 | { |
7076 | FILE *f = fopen(path.c_str(), "r"); | |
7077 | if (!f) | |
7078 | { | |
2713ea24 | 7079 | sess.print_warning("cannot read symbol table from " + path + " -- " + strerror(errno)); |
5f0a03a6 JK |
7080 | return info_absent; |
7081 | } | |
7082 | enum info_status status = read_symbols(f, path); | |
7083 | (void) fclose(f); | |
7084 | return status; | |
7085 | } | |
7086 | ||
46f7b6be | 7087 | void |
f98c6346 | 7088 | symbol_table::prepare_section_rejection(Dwfl_Module *mod __attribute__ ((unused))) |
46f7b6be JK |
7089 | { |
7090 | #ifdef __powerpc__ | |
7091 | /* | |
7092 | * The .opd section contains function descriptors that can look | |
7093 | * just like function entry points. For example, there's a function | |
7094 | * descriptor called "do_exit" that links to the entry point ".do_exit". | |
7095 | * Reject all symbols in .opd. | |
7096 | */ | |
7097 | opd_section = SHN_UNDEF; | |
7098 | Dwarf_Addr bias; | |
7099 | Elf* elf = (dwarf_getelf (dwfl_module_getdwarf (mod, &bias)) | |
7100 | ?: dwfl_module_getelf (mod, &bias)); | |
7101 | Elf_Scn* scn = 0; | |
7102 | size_t shstrndx; | |
7103 | ||
7104 | if (!elf) | |
7105 | return; | |
fcc30d6d | 7106 | if (elf_getshdrstrndx (elf, &shstrndx) != 0) |
46f7b6be JK |
7107 | return; |
7108 | while ((scn = elf_nextscn(elf, scn)) != NULL) | |
7109 | { | |
7110 | GElf_Shdr shdr_mem; | |
7111 | GElf_Shdr *shdr = gelf_getshdr(scn, &shdr_mem); | |
7112 | if (!shdr) | |
7113 | continue; | |
7114 | const char *name = elf_strptr(elf, shstrndx, shdr->sh_name); | |
7115 | if (!strcmp(name, ".opd")) | |
7116 | { | |
7117 | opd_section = elf_ndxscn(scn); | |
7118 | return; | |
7119 | } | |
7120 | } | |
7121 | #endif | |
7122 | } | |
7123 | ||
7124 | bool | |
7125 | symbol_table::reject_section(GElf_Word section) | |
7126 | { | |
7127 | if (section == SHN_UNDEF) | |
7128 | return true; | |
7129 | #ifdef __powerpc__ | |
7130 | if (section == opd_section) | |
7131 | return true; | |
7132 | #endif | |
7133 | return false; | |
7134 | } | |
7135 | ||
5f0a03a6 JK |
7136 | enum info_status |
7137 | symbol_table::get_from_elf() | |
7138 | { | |
7139 | Dwarf_Addr high_addr = 0; | |
7140 | Dwfl_Module *mod = mod_info->mod; | |
7141 | int syments = dwfl_module_getsymtab(mod); | |
7142 | assert(syments); | |
46f7b6be | 7143 | prepare_section_rejection(mod); |
5f0a03a6 JK |
7144 | for (int i = 1; i < syments; ++i) |
7145 | { | |
7146 | GElf_Sym sym; | |
ab91b232 JK |
7147 | GElf_Word section; |
7148 | const char *name = dwfl_module_getsym(mod, i, &sym, §ion); | |
2867a2a1 | 7149 | if (name && GELF_ST_TYPE(sym.st_info) == STT_FUNC) |
ab91b232 | 7150 | add_symbol(name, (GELF_ST_BIND(sym.st_info) == STB_WEAK), |
2867a2a1 | 7151 | reject_section(section), sym.st_value, &high_addr); |
5f0a03a6 JK |
7152 | } |
7153 | return info_present; | |
7154 | } | |
7155 | ||
5f0a03a6 JK |
7156 | func_info * |
7157 | symbol_table::get_func_containing_address(Dwarf_Addr addr) | |
7158 | { | |
1c6b77e5 JS |
7159 | iterator_t iter = map_by_addr.upper_bound(addr); |
7160 | if (iter == map_by_addr.begin()) | |
5f0a03a6 | 7161 | return NULL; |
2e67a43b | 7162 | else |
1c6b77e5 | 7163 | return (--iter)->second; |
5f0a03a6 JK |
7164 | } |
7165 | ||
3d372d6b SC |
7166 | func_info * |
7167 | symbol_table::get_first_func() | |
7168 | { | |
7169 | iterator_t iter = map_by_addr.begin(); | |
7170 | return (iter)->second; | |
7171 | } | |
7172 | ||
5f0a03a6 JK |
7173 | func_info * |
7174 | symbol_table::lookup_symbol(const string& name) | |
7175 | { | |
7176 | map<string, func_info*>::iterator i = map_by_name.find(name); | |
7177 | if (i == map_by_name.end()) | |
7178 | return NULL; | |
7179 | return i->second; | |
7180 | } | |
7181 | ||
7182 | Dwarf_Addr | |
7183 | symbol_table::lookup_symbol_address(const string& name) | |
7184 | { | |
7185 | func_info *fi = lookup_symbol(name); | |
7186 | if (fi) | |
7187 | return fi->addr; | |
7188 | return 0; | |
7189 | } | |
7190 | ||
ab91b232 JK |
7191 | // This is the kernel symbol table. The kernel macro cond_syscall creates |
7192 | // a weak symbol for each system call and maps it to sys_ni_syscall. | |
7193 | // For system calls not implemented elsewhere, this weak symbol shows up | |
7194 | // in the kernel symbol table. Following the precedent of dwarfful stap, | |
7195 | // we refuse to consider such symbols. Here we delete them from our | |
7196 | // symbol table. | |
7197 | // TODO: Consider generalizing this and/or making it part of blacklist | |
7198 | // processing. | |
7199 | void | |
7200 | symbol_table::purge_syscall_stubs() | |
7201 | { | |
7202 | Dwarf_Addr stub_addr = lookup_symbol_address("sys_ni_syscall"); | |
7203 | if (stub_addr == 0) | |
7204 | return; | |
1c6b77e5 | 7205 | range_t purge_range = map_by_addr.equal_range(stub_addr); |
2e67a43b TM |
7206 | for (iterator_t iter = purge_range.first; |
7207 | iter != purge_range.second; | |
1c6b77e5 | 7208 | ) |
ab91b232 | 7209 | { |
1c6b77e5 | 7210 | func_info *fi = iter->second; |
2e67a43b | 7211 | if (fi->weak && fi->name != "sys_ni_syscall") |
ab91b232 | 7212 | { |
2e67a43b | 7213 | map_by_name.erase(fi->name); |
1c6b77e5 | 7214 | map_by_addr.erase(iter++); |
2e67a43b | 7215 | delete fi; |
2e67a43b | 7216 | } |
1c6b77e5 JS |
7217 | else |
7218 | iter++; | |
ab91b232 JK |
7219 | } |
7220 | } | |
7221 | ||
5f0a03a6 JK |
7222 | void |
7223 | module_info::get_symtab(dwarf_query *q) | |
7224 | { | |
7225 | systemtap_session &sess = q->sess; | |
7226 | ||
1c6b77e5 JS |
7227 | if (symtab_status != info_unknown) |
7228 | return; | |
7229 | ||
5f0a03a6 JK |
7230 | sym_table = new symbol_table(this); |
7231 | if (!elf_path.empty()) | |
7232 | { | |
2713ea24 CM |
7233 | if (name == TOK_KERNEL && !sess.kernel_symtab_path.empty()) |
7234 | sess.print_warning("reading symbol table from " + elf_path + " -- ignoring " + sess.kernel_symtab_path.c_str()); | |
5f0a03a6 JK |
7235 | symtab_status = sym_table->get_from_elf(); |
7236 | } | |
7237 | else | |
7238 | { | |
7239 | assert(name == TOK_KERNEL); | |
7240 | if (sess.kernel_symtab_path.empty()) | |
7241 | { | |
7242 | symtab_status = info_absent; | |
3d372d6b | 7243 | cerr << _("Error: Cannot find vmlinux.\n" |
b530b5b3 | 7244 | " Consider using --kmap instead of --kelf.") |
5f0a03a6 JK |
7245 | << endl;; |
7246 | } | |
7247 | else | |
7248 | { | |
7249 | symtab_status = | |
83ca3872 | 7250 | sym_table->read_from_text_file(sess.kernel_symtab_path, sess); |
5f0a03a6 JK |
7251 | if (symtab_status == info_present) |
7252 | { | |
7253 | sess.sym_kprobes_text_start = | |
7254 | sym_table->lookup_symbol_address("__kprobes_text_start"); | |
7255 | sess.sym_kprobes_text_end = | |
7256 | sym_table->lookup_symbol_address("__kprobes_text_end"); | |
7257 | sess.sym_stext = sym_table->lookup_symbol_address("_stext"); | |
5f0a03a6 JK |
7258 | } |
7259 | } | |
7260 | } | |
7261 | if (symtab_status == info_absent) | |
7262 | { | |
7263 | delete sym_table; | |
7264 | sym_table = NULL; | |
7265 | return; | |
7266 | } | |
7267 | ||
ab91b232 JK |
7268 | if (name == TOK_KERNEL) |
7269 | sym_table->purge_syscall_stubs(); | |
5f0a03a6 JK |
7270 | } |
7271 | ||
1c6b77e5 JS |
7272 | // update_symtab reconciles data between the elf symbol table and the dwarf |
7273 | // function enumeration. It updates the symbol table entries with the dwarf | |
7274 | // die that describes the function, which also signals to query_module_symtab | |
7275 | // that a statement probe isn't needed. In return, it also adds aliases to the | |
7276 | // function table for names that share the same addr/die. | |
7277 | void | |
7278 | module_info::update_symtab(cu_function_cache_t *funcs) | |
7279 | { | |
7280 | if (!sym_table) | |
7281 | return; | |
7282 | ||
7283 | cu_function_cache_t new_funcs; | |
7284 | ||
7285 | for (cu_function_cache_t::iterator func = funcs->begin(); | |
7286 | func != funcs->end(); func++) | |
7287 | { | |
7288 | // optimization: inlines will never be in the symbol table | |
7289 | if (dwarf_func_inline(&func->second) != 0) | |
7290 | continue; | |
7291 | ||
1ffb8bd1 JS |
7292 | // XXX We may want to make additional efforts to match mangled elf names |
7293 | // to dwarf too. MIPS_linkage_name can help, but that's sometimes | |
7294 | // missing, so we may also need to try matching by address. See also the | |
7295 | // notes about _Z in dwflpp::iterate_over_functions(). | |
7296 | ||
1c6b77e5 JS |
7297 | func_info *fi = sym_table->lookup_symbol(func->first); |
7298 | if (!fi) | |
7299 | continue; | |
7300 | ||
7301 | // iterate over all functions at the same address | |
7302 | symbol_table::range_t er = sym_table->map_by_addr.equal_range(fi->addr); | |
7303 | for (symbol_table::iterator_t it = er.first; it != er.second; ++it) | |
7304 | { | |
7305 | // update this function with the dwarf die | |
7306 | it->second->die = func->second; | |
7307 | ||
7308 | // if this function is a new alias, then | |
7309 | // save it to merge into the function cache | |
7310 | if (it->second != fi) | |
b7478964 | 7311 | new_funcs.insert(make_pair(it->second->name, it->second->die)); |
1c6b77e5 JS |
7312 | } |
7313 | } | |
7314 | ||
7315 | // add all discovered aliases back into the function cache | |
7316 | // NB: this won't replace any names that dwarf may have already found | |
7317 | funcs->insert(new_funcs.begin(), new_funcs.end()); | |
7318 | } | |
7319 | ||
5f0a03a6 JK |
7320 | module_info::~module_info() |
7321 | { | |
7322 | if (sym_table) | |
7323 | delete sym_table; | |
b55bc428 FCE |
7324 | } |
7325 | ||
935447c8 | 7326 | // ------------------------------------------------------------------------ |
888af770 | 7327 | // user-space probes |
935447c8 DS |
7328 | // ------------------------------------------------------------------------ |
7329 | ||
935447c8 | 7330 | |
888af770 | 7331 | struct uprobe_derived_probe_group: public generic_dpg<uprobe_derived_probe> |
935447c8 | 7332 | { |
89ba3085 FCE |
7333 | private: |
7334 | string make_pbm_key (uprobe_derived_probe* p) { | |
cfcab6c7 | 7335 | return p->path + "|" + p->module + "|" + p->section + "|" + lex_cast(p->pid); |
89ba3085 FCE |
7336 | } |
7337 | ||
cfcab6c7 JS |
7338 | void emit_module_maxuprobes (systemtap_session& s); |
7339 | ||
2b69faaf JS |
7340 | // Using our own utrace-based uprobes |
7341 | void emit_module_utrace_decls (systemtap_session& s); | |
7342 | void emit_module_utrace_init (systemtap_session& s); | |
7343 | void emit_module_utrace_exit (systemtap_session& s); | |
7344 | ||
7345 | // Using the upstream inode-based uprobes | |
7346 | void emit_module_inode_decls (systemtap_session& s); | |
7347 | void emit_module_inode_init (systemtap_session& s); | |
7348 | void emit_module_inode_exit (systemtap_session& s); | |
7349 | ||
935447c8 | 7350 | public: |
888af770 | 7351 | void emit_module_decls (systemtap_session& s); |
935447c8 DS |
7352 | void emit_module_init (systemtap_session& s); |
7353 | void emit_module_exit (systemtap_session& s); | |
7354 | }; | |
7355 | ||
7356 | ||
888af770 FCE |
7357 | void |
7358 | uprobe_derived_probe::join_group (systemtap_session& s) | |
7359 | { | |
7360 | if (! s.uprobe_derived_probes) | |
7361 | s.uprobe_derived_probes = new uprobe_derived_probe_group (); | |
7362 | s.uprobe_derived_probes->enroll (this); | |
93646f4d | 7363 | enable_task_finder(s); |
a96d1db0 | 7364 | |
8a03658e | 7365 | // Ask buildrun.cxx to build extra module if needed, and |
d3e959b0 DS |
7366 | // signal staprun to load that module. If we're using the builtin |
7367 | // inode-uprobes, we still need to know that it is required. | |
8a03658e | 7368 | s.need_uprobes = true; |
a96d1db0 DN |
7369 | } |
7370 | ||
888af770 | 7371 | |
c0f84e7b SC |
7372 | void |
7373 | uprobe_derived_probe::getargs(std::list<std::string> &arg_set) const | |
7374 | { | |
7375 | dwarf_derived_probe::getargs(arg_set); | |
7376 | arg_set.insert(arg_set.end(), args.begin(), args.end()); | |
7377 | } | |
7378 | ||
7379 | ||
7380 | void | |
7381 | uprobe_derived_probe::saveargs(int nargs) | |
7382 | { | |
7383 | for (int i = 1; i <= nargs; i++) | |
7384 | args.push_back("$arg" + lex_cast (i) + ":long"); | |
7385 | } | |
7386 | ||
7387 | ||
2865d17a | 7388 | void |
42e38653 | 7389 | uprobe_derived_probe::emit_privilege_assertion (translator_output* o) |
2865d17a DB |
7390 | { |
7391 | // These probes are allowed for unprivileged users, but only in the | |
7392 | // context of processes which they own. | |
7393 | emit_process_owner_assertion (o); | |
7394 | } | |
7395 | ||
7396 | ||
888af770 | 7397 | struct uprobe_builder: public derived_probe_builder |
a96d1db0 | 7398 | { |
888af770 | 7399 | uprobe_builder() {} |
2b69faaf | 7400 | virtual void build(systemtap_session & sess, |
a96d1db0 DN |
7401 | probe * base, |
7402 | probe_point * location, | |
86bf665e | 7403 | literal_map_t const & parameters, |
a96d1db0 DN |
7404 | vector<derived_probe *> & finished_results) |
7405 | { | |
888af770 | 7406 | int64_t process, address; |
a96d1db0 | 7407 | |
2b69faaf JS |
7408 | if (kernel_supports_inode_uprobes(sess)) |
7409 | throw semantic_error (_("absolute process probes not available with inode-based uprobes")); | |
7410 | ||
888af770 | 7411 | bool b1 = get_param (parameters, TOK_PROCESS, process); |
ced347a9 | 7412 | (void) b1; |
888af770 | 7413 | bool b2 = get_param (parameters, TOK_STATEMENT, address); |
ced347a9 | 7414 | (void) b2; |
888af770 FCE |
7415 | bool rr = has_null_param (parameters, TOK_RETURN); |
7416 | assert (b1 && b2); // by pattern_root construction | |
a96d1db0 | 7417 | |
0973d815 | 7418 | finished_results.push_back(new uprobe_derived_probe(base, location, process, address, rr)); |
a96d1db0 DN |
7419 | } |
7420 | }; | |
7421 | ||
7422 | ||
7423 | void | |
cfcab6c7 | 7424 | uprobe_derived_probe_group::emit_module_maxuprobes (systemtap_session& s) |
a96d1db0 | 7425 | { |
43241c44 FCE |
7426 | // We'll probably need at least this many: |
7427 | unsigned minuprobes = probes.size(); | |
7428 | // .. but we don't want so many that .bss is inflated (PR10507): | |
7429 | unsigned uprobesize = 64; | |
7430 | unsigned maxuprobesmem = 10*1024*1024; // 10 MB | |
7431 | unsigned maxuprobes = maxuprobesmem / uprobesize; | |
7432 | ||
aaf7ffe8 FCE |
7433 | // Let's choose a value on the geometric middle. This should end up |
7434 | // between minuprobes and maxuprobes. It's OK if this number turns | |
7435 | // out to be < minuprobes or > maxuprobes. At worst, we get a | |
7436 | // run-time error of one kind (too few: missed uprobe registrations) | |
7437 | // or another (too many: vmalloc errors at module load time). | |
7438 | unsigned default_maxuprobes = (unsigned)sqrt((double)minuprobes * (double)maxuprobes); | |
43241c44 | 7439 | |
6d0f3f0c | 7440 | s.op->newline() << "#ifndef MAXUPROBES"; |
43241c44 | 7441 | s.op->newline() << "#define MAXUPROBES " << default_maxuprobes; |
6d0f3f0c | 7442 | s.op->newline() << "#endif"; |
cfcab6c7 JS |
7443 | } |
7444 | ||
7445 | ||
7446 | void | |
7447 | uprobe_derived_probe_group::emit_module_utrace_decls (systemtap_session& s) | |
7448 | { | |
7449 | if (probes.empty()) return; | |
7450 | s.op->newline() << "/* ---- utrace uprobes ---- */"; | |
7451 | // If uprobes isn't in the kernel, pull it in from the runtime. | |
7452 | ||
7453 | s.op->newline() << "#if defined(CONFIG_UPROBES) || defined(CONFIG_UPROBES_MODULE)"; | |
7454 | s.op->newline() << "#include <linux/uprobes.h>"; | |
7455 | s.op->newline() << "#else"; | |
7456 | s.op->newline() << "#include \"uprobes/uprobes.h\""; | |
7457 | s.op->newline() << "#endif"; | |
7458 | s.op->newline() << "#ifndef UPROBES_API_VERSION"; | |
7459 | s.op->newline() << "#define UPROBES_API_VERSION 1"; | |
7460 | s.op->newline() << "#endif"; | |
7461 | ||
7462 | emit_module_maxuprobes (s); | |
a96d1db0 | 7463 | |
cc52276b WC |
7464 | // Forward decls |
7465 | s.op->newline() << "#include \"uprobes-common.h\""; | |
7466 | ||
5e112f92 FCE |
7467 | // In .bss, the shared pool of uprobe/uretprobe structs. These are |
7468 | // too big to embed in the initialized .data stap_uprobe_spec array. | |
cc52276b WC |
7469 | // XXX: consider a slab cache or somesuch for stap_uprobes |
7470 | s.op->newline() << "static struct stap_uprobe stap_uprobes [MAXUPROBES];"; | |
5e112f92 | 7471 | s.op->newline() << "DEFINE_MUTEX(stap_uprobes_lock);"; // protects against concurrent registration/unregistration |
a96d1db0 | 7472 | |
89ba3085 FCE |
7473 | s.op->assert_0_indent(); |
7474 | ||
89ba3085 FCE |
7475 | // Assign task-finder numbers as we build up the stap_uprobe_tf table. |
7476 | // This means we process probes[] in two passes. | |
7477 | map <string,unsigned> module_index; | |
7478 | unsigned module_index_ctr = 0; | |
7479 | ||
cc52276b WC |
7480 | // not const since embedded task_finder_target struct changes |
7481 | s.op->newline() << "static struct stap_uprobe_tf stap_uprobe_finders[] = {"; | |
89ba3085 FCE |
7482 | s.op->indent(1); |
7483 | for (unsigned i=0; i<probes.size(); i++) | |
7484 | { | |
7485 | uprobe_derived_probe *p = probes[i]; | |
7486 | string pbmkey = make_pbm_key (p); | |
7487 | if (module_index.find (pbmkey) == module_index.end()) | |
7488 | { | |
7489 | module_index[pbmkey] = module_index_ctr++; | |
7490 | ||
7491 | s.op->newline() << "{"; | |
7492 | // NB: it's essential that make_pbm_key() use all of and | |
7493 | // only the same fields as we're about to emit. | |
7494 | s.op->line() << " .finder={"; | |
7495 | if (p->pid != 0) | |
68910c97 JK |
7496 | s.op->line() << " .pid=" << p->pid << ","; |
7497 | ||
7498 | if (p->section == "") // .statement(addr).absolute | |
7499 | s.op->line() << " .callback=&stap_uprobe_process_found,"; | |
89ba3085 FCE |
7500 | else if (p->section == ".absolute") // proxy for ET_EXEC -> exec()'d program |
7501 | { | |
7502 | s.op->line() << " .procname=" << lex_cast_qstring(p->module) << ","; | |
7503 | s.op->line() << " .callback=&stap_uprobe_process_found,"; | |
7504 | } | |
68910c97 | 7505 | else if (p->section != ".absolute") // ET_DYN |
89ba3085 | 7506 | { |
4ad95bbc SC |
7507 | if (p->has_library) |
7508 | s.op->line() << " .procname=\"" << p->path << "\", "; | |
89ba3085 FCE |
7509 | s.op->line() << " .mmap_callback=&stap_uprobe_mmap_found, "; |
7510 | s.op->line() << " .munmap_callback=&stap_uprobe_munmap_found, "; | |
19d91f6c | 7511 | s.op->line() << " .callback=&stap_uprobe_process_munmap,"; |
89ba3085 | 7512 | } |
89ba3085 | 7513 | s.op->line() << " },"; |
68910c97 JK |
7514 | if (p->module != "") |
7515 | s.op->line() << " .pathname=" << lex_cast_qstring(p->module) << ", "; | |
89ba3085 FCE |
7516 | s.op->line() << " },"; |
7517 | } | |
c57ea854 | 7518 | else |
822a6a3d | 7519 | { } // skip it in this pass, already have a suitable stap_uprobe_tf slot for it. |
89ba3085 FCE |
7520 | } |
7521 | s.op->newline(-1) << "};"; | |
7522 | ||
7523 | s.op->assert_0_indent(); | |
7524 | ||
cc52276b WC |
7525 | // NB: read-only structure |
7526 | s.op->newline() << "static const struct stap_uprobe_spec stap_uprobe_specs [] = {"; | |
a96d1db0 | 7527 | s.op->indent(1); |
888af770 FCE |
7528 | for (unsigned i =0; i<probes.size(); i++) |
7529 | { | |
7530 | uprobe_derived_probe* p = probes[i]; | |
7531 | s.op->newline() << "{"; | |
89ba3085 FCE |
7532 | string key = make_pbm_key (p); |
7533 | unsigned value = module_index[key]; | |
759e1d76 FCE |
7534 | if (value != 0) |
7535 | s.op->line() << " .tfi=" << value << ","; | |
6b66b9f7 | 7536 | s.op->line() << " .address=(unsigned long)0x" << hex << p->addr << dec << "ULL,"; |
faea5e16 | 7537 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
4ddb6dd0 | 7538 | |
038c38c6 | 7539 | if (p->sdt_semaphore_addr != 0) |
63b4fd14 | 7540 | s.op->line() << " .sdt_sem_offset=(unsigned long)0x" |
038c38c6 | 7541 | << hex << p->sdt_semaphore_addr << dec << "ULL,"; |
4ddb6dd0 JS |
7542 | |
7543 | if (p->has_return) | |
7544 | s.op->line() << " .return_p=1,"; | |
888af770 FCE |
7545 | s.op->line() << " },"; |
7546 | } | |
7547 | s.op->newline(-1) << "};"; | |
a96d1db0 | 7548 | |
89ba3085 FCE |
7549 | s.op->assert_0_indent(); |
7550 | ||
48e685da | 7551 | s.op->newline() << "static void enter_uprobe_probe (struct uprobe *inst, struct pt_regs *regs) {"; |
888af770 | 7552 | s.op->newline(1) << "struct stap_uprobe *sup = container_of(inst, struct stap_uprobe, up);"; |
89ba3085 | 7553 | s.op->newline() << "const struct stap_uprobe_spec *sups = &stap_uprobe_specs [sup->spec_index];"; |
6eefe942 MW |
7554 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sups->probe", |
7555 | "_STP_PROBE_HANDLER_UPROBE"); | |
0e090c74 | 7556 | s.op->newline() << "if (sup->spec_index < 0 || " |
6e895029 DS |
7557 | << "sup->spec_index >= " << probes.size() << ") {"; |
7558 | s.op->newline(1) << "_stp_error (\"bad spec_index %d (max " << probes.size() | |
0e090c74 | 7559 | << "): %s\", sup->spec_index, c->probe_point);"; |
6e895029 DS |
7560 | s.op->newline() << "atomic_dec (&c->busy);"; |
7561 | s.op->newline() << "goto probe_epilogue;"; | |
7562 | s.op->newline(-1) << "}"; | |
d9aed31e | 7563 | s.op->newline() << "c->uregs = regs;"; |
92c25572 | 7564 | s.op->newline() << "c->probe_flags |= _STP_PROBE_STATE_USER_MODE;"; |
6415ddde MW |
7565 | |
7566 | // Make it look like the IP is set as it would in the actual user | |
7567 | // task when calling real probe handler. Reset IP regs on return, so | |
7568 | // we don't confuse uprobes. PR10458 | |
7569 | s.op->newline() << "{"; | |
7570 | s.op->indent(1); | |
d9aed31e | 7571 | s.op->newline() << "unsigned long uprobes_ip = REG_IP(c->uregs);"; |
259d54c0 | 7572 | s.op->newline() << "SET_REG_IP(regs, inst->vaddr);"; |
26e63673 | 7573 | s.op->newline() << "(*sups->probe->ph) (c);"; |
259d54c0 | 7574 | s.op->newline() << "SET_REG_IP(regs, uprobes_ip);"; |
6415ddde MW |
7575 | s.op->newline(-1) << "}"; |
7576 | ||
7baf48e9 | 7577 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
888af770 | 7578 | s.op->newline(-1) << "}"; |
a96d1db0 | 7579 | |
48e685da | 7580 | s.op->newline() << "static void enter_uretprobe_probe (struct uretprobe_instance *inst, struct pt_regs *regs) {"; |
888af770 | 7581 | s.op->newline(1) << "struct stap_uprobe *sup = container_of(inst->rp, struct stap_uprobe, urp);"; |
89ba3085 | 7582 | s.op->newline() << "const struct stap_uprobe_spec *sups = &stap_uprobe_specs [sup->spec_index];"; |
6eefe942 MW |
7583 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sups->probe", |
7584 | "_STP_PROBE_HANDLER_URETPROBE"); | |
6dceb5c9 | 7585 | s.op->newline() << "c->ips.ri = inst;"; |
0e090c74 | 7586 | s.op->newline() << "if (sup->spec_index < 0 || " |
0d5561a5 DS |
7587 | << "sup->spec_index >= " << probes.size() << ") {"; |
7588 | s.op->newline(1) << "_stp_error (\"bad spec_index %d (max " << probes.size() | |
0e090c74 | 7589 | << "): %s\", sup->spec_index, c->probe_point);"; |
0d5561a5 DS |
7590 | s.op->newline() << "atomic_dec (&c->busy);"; |
7591 | s.op->newline() << "goto probe_epilogue;"; | |
7592 | s.op->newline(-1) << "}"; | |
7593 | ||
d9aed31e | 7594 | s.op->newline() << "c->uregs = regs;"; |
92c25572 | 7595 | s.op->newline() << "c->probe_flags |= _STP_PROBE_STATE_USER_MODE;"; |
6415ddde MW |
7596 | |
7597 | // Make it look like the IP is set as it would in the actual user | |
7598 | // task when calling real probe handler. Reset IP regs on return, so | |
7599 | // we don't confuse uprobes. PR10458 | |
7600 | s.op->newline() << "{"; | |
7601 | s.op->indent(1); | |
d9aed31e | 7602 | s.op->newline() << "unsigned long uprobes_ip = REG_IP(c->uregs);"; |
5e562a69 | 7603 | s.op->newline() << "SET_REG_IP(regs, inst->ret_addr);"; |
26e63673 | 7604 | s.op->newline() << "(*sups->probe->ph) (c);"; |
259d54c0 | 7605 | s.op->newline() << "SET_REG_IP(regs, uprobes_ip);"; |
6415ddde MW |
7606 | s.op->newline(-1) << "}"; |
7607 | ||
7baf48e9 | 7608 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
a96d1db0 DN |
7609 | s.op->newline(-1) << "}"; |
7610 | ||
89ba3085 | 7611 | s.op->newline(); |
cc52276b | 7612 | s.op->newline() << "#include \"uprobes-common.c\""; |
6d0f3f0c | 7613 | s.op->newline(); |
888af770 | 7614 | } |
935447c8 DS |
7615 | |
7616 | ||
888af770 | 7617 | void |
2b69faaf | 7618 | uprobe_derived_probe_group::emit_module_utrace_init (systemtap_session& s) |
935447c8 | 7619 | { |
888af770 | 7620 | if (probes.empty()) return; |
935447c8 | 7621 | |
2b69faaf | 7622 | s.op->newline() << "/* ---- utrace uprobes ---- */"; |
935447c8 | 7623 | |
01b05e2e | 7624 | s.op->newline() << "for (j=0; j<MAXUPROBES; j++) {"; |
5e112f92 FCE |
7625 | s.op->newline(1) << "struct stap_uprobe *sup = & stap_uprobes[j];"; |
7626 | s.op->newline() << "sup->spec_index = -1;"; // free slot | |
80b4ad8b FCE |
7627 | // NB: we assume the rest of the struct (specificaly, sup->up) is |
7628 | // initialized to zero. This is so that we can use | |
7629 | // sup->up->kdata = NULL for "really free!" PR 6829. | |
5e112f92 FCE |
7630 | s.op->newline(-1) << "}"; |
7631 | s.op->newline() << "mutex_init (& stap_uprobes_lock);"; | |
935447c8 | 7632 | |
89ba3085 FCE |
7633 | // Set up the task_finders |
7634 | s.op->newline() << "for (i=0; i<sizeof(stap_uprobe_finders)/sizeof(stap_uprobe_finders[0]); i++) {"; | |
7635 | s.op->newline(1) << "struct stap_uprobe_tf *stf = & stap_uprobe_finders[i];"; | |
c57ea854 | 7636 | s.op->newline() << "probe_point = stf->pathname;"; // for error messages; XXX: would prefer pp() or something better |
89ba3085 | 7637 | s.op->newline() << "rc = stap_register_task_finder_target (& stf->finder);"; |
935447c8 | 7638 | |
5e112f92 FCE |
7639 | // NB: if (rc), there is no need (XXX: nor any way) to clean up any |
7640 | // finders already registered, since mere registration does not | |
7641 | // cause any utrace or memory allocation actions. That happens only | |
7642 | // later, once the task finder engine starts running. So, for a | |
7643 | // partial initialization requiring unwind, we need do nothing. | |
7644 | s.op->newline() << "if (rc) break;"; | |
a7a68293 | 7645 | |
888af770 FCE |
7646 | s.op->newline(-1) << "}"; |
7647 | } | |
d0ea46ce | 7648 | |
d0a7f5a9 | 7649 | |
888af770 | 7650 | void |
2b69faaf | 7651 | uprobe_derived_probe_group::emit_module_utrace_exit (systemtap_session& s) |
888af770 FCE |
7652 | { |
7653 | if (probes.empty()) return; | |
2b69faaf | 7654 | s.op->newline() << "/* ---- utrace uprobes ---- */"; |
e56e51c9 | 7655 | |
6d0f3f0c FCE |
7656 | // NB: there is no stap_unregister_task_finder_target call; |
7657 | // important stuff like utrace cleanups are done by | |
d41d451c FCE |
7658 | // __stp_task_finder_cleanup() via stap_stop_task_finder(). |
7659 | // | |
7660 | // This function blocks until all callbacks are completed, so there | |
7661 | // is supposed to be no possibility of any registration-related code starting | |
7662 | // to run in parallel with our shutdown here. So we don't need to protect the | |
7663 | // stap_uprobes[] array with the mutex. | |
d0a7f5a9 | 7664 | |
01b05e2e | 7665 | s.op->newline() << "for (j=0; j<MAXUPROBES; j++) {"; |
5e112f92 | 7666 | s.op->newline(1) << "struct stap_uprobe *sup = & stap_uprobes[j];"; |
89ba3085 | 7667 | s.op->newline() << "const struct stap_uprobe_spec *sups = &stap_uprobe_specs [sup->spec_index];"; |
6d0f3f0c | 7668 | s.op->newline() << "if (sup->spec_index < 0) continue;"; // free slot |
3568f1dd | 7669 | |
8faa1fc5 | 7670 | // PR10655: decrement that ENABLED semaphore |
c116c31b | 7671 | s.op->newline() << "if (sup->sdt_sem_address) {"; |
8faa1fc5 FCE |
7672 | s.op->newline(1) << "unsigned short sdt_semaphore;"; // NB: fixed size |
7673 | s.op->newline() << "pid_t pid = (sups->return_p ? sup->urp.u.pid : sup->up.pid);"; | |
7674 | s.op->newline() << "struct task_struct *tsk;"; | |
7675 | s.op->newline() << "rcu_read_lock();"; | |
6846cfc8 | 7676 | |
86229a55 DS |
7677 | // Do a pid->task_struct* lookup. For 2.6.24+, this code assumes |
7678 | // that the pid is always in the global namespace, not in any | |
7679 | // private namespace. | |
8faa1fc5 | 7680 | s.op->newline() << "#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)"; |
86229a55 DS |
7681 | // We'd like to call find_task_by_pid_ns() here, but it isn't |
7682 | // exported. So, we call what it calls... | |
7683 | s.op->newline() << " tsk = pid_task(find_pid_ns(pid, &init_pid_ns), PIDTYPE_PID);"; | |
8faa1fc5 FCE |
7684 | s.op->newline() << "#else"; |
7685 | s.op->newline() << " tsk = find_task_by_pid (pid);"; | |
7686 | s.op->newline() << "#endif /* 2.6.24 */"; | |
8faa1fc5 FCE |
7687 | |
7688 | s.op->newline() << "if (tsk) {"; // just in case the thing exited while we weren't watching | |
3c5b8e2b | 7689 | s.op->newline(1) << "if (__access_process_vm_noflush(tsk, sup->sdt_sem_address, &sdt_semaphore, sizeof(sdt_semaphore), 0)) {"; |
63b4fd14 | 7690 | s.op->newline(1) << "sdt_semaphore --;"; |
903b9fcd | 7691 | s.op->newline() << "#ifdef DEBUG_UPROBES"; |
c116c31b | 7692 | s.op->newline() << "_stp_dbug (__FUNCTION__,__LINE__, \"-semaphore %#x @ %#lx\\n\", sdt_semaphore, sup->sdt_sem_address);"; |
903b9fcd | 7693 | s.op->newline() << "#endif"; |
3c5b8e2b | 7694 | s.op->newline() << "__access_process_vm_noflush(tsk, sup->sdt_sem_address, &sdt_semaphore, sizeof(sdt_semaphore), 1);"; |
93c84191 | 7695 | s.op->newline(-1) << "}"; |
8faa1fc5 FCE |
7696 | // XXX: need to analyze possibility of race condition |
7697 | s.op->newline(-1) << "}"; | |
7698 | s.op->newline() << "rcu_read_unlock();"; | |
7699 | s.op->newline(-1) << "}"; | |
6846cfc8 | 7700 | |
3568f1dd FCE |
7701 | s.op->newline() << "if (sups->return_p) {"; |
7702 | s.op->newline(1) << "#ifdef DEBUG_UPROBES"; | |
89ba3085 | 7703 | 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 | 7704 | s.op->newline() << "#endif"; |
80b4ad8b FCE |
7705 | // NB: PR6829 does not change that we still need to unregister at |
7706 | // *this* time -- when the script as a whole exits. | |
3568f1dd FCE |
7707 | s.op->newline() << "unregister_uretprobe (& sup->urp);"; |
7708 | s.op->newline(-1) << "} else {"; | |
7709 | s.op->newline(1) << "#ifdef DEBUG_UPROBES"; | |
8faa1fc5 | 7710 | 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 |
7711 | s.op->newline() << "#endif"; |
7712 | s.op->newline() << "unregister_uprobe (& sup->up);"; | |
7713 | s.op->newline(-1) << "}"; | |
935447c8 | 7714 | |
6d0f3f0c | 7715 | s.op->newline() << "sup->spec_index = -1;"; |
935447c8 | 7716 | |
3568f1dd FCE |
7717 | // XXX: uprobe missed counts? |
7718 | ||
6d0f3f0c | 7719 | s.op->newline(-1) << "}"; |
935447c8 | 7720 | |
5e112f92 | 7721 | s.op->newline() << "mutex_destroy (& stap_uprobes_lock);"; |
935447c8 DS |
7722 | } |
7723 | ||
2b69faaf JS |
7724 | |
7725 | void | |
7726 | uprobe_derived_probe_group::emit_module_inode_decls (systemtap_session& s) | |
7727 | { | |
7728 | if (probes.empty()) return; | |
7729 | s.op->newline() << "/* ---- inode uprobes ---- */"; | |
cfcab6c7 | 7730 | emit_module_maxuprobes (s); |
2b69faaf JS |
7731 | s.op->newline() << "#include \"uprobes-inode.c\""; |
7732 | ||
7733 | // Write the probe handler. | |
7734 | s.op->newline() << "static int enter_inode_uprobe " | |
7735 | << "(struct uprobe_consumer *inst, struct pt_regs *regs) {"; | |
cfcab6c7 JS |
7736 | s.op->newline(1) << "struct stapiu_consumer *sup = " |
7737 | << "container_of(inst, struct stapiu_consumer, consumer);"; | |
fe5acded JS |
7738 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sup->probe", |
7739 | "_STP_PROBE_HANDLER_UPROBE"); | |
3bff6634 JS |
7740 | s.op->newline() << "c->uregs = regs;"; |
7741 | s.op->newline() << "c->probe_flags |= _STP_PROBE_STATE_USER_MODE;"; | |
2b69faaf JS |
7742 | // XXX: Can't set SET_REG_IP; we don't actually know the relocated address. |
7743 | // ... In some error cases, uprobes itself calls uprobes_get_bkpt_addr(). | |
7744 | s.op->newline() << "(*sup->probe->ph) (c);"; | |
7ee95b6b | 7745 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
2b69faaf JS |
7746 | s.op->newline() << "return 0;"; |
7747 | s.op->newline(-1) << "}"; | |
7748 | s.op->assert_0_indent(); | |
7749 | ||
7750 | // Index of all the modules for which we need inodes. | |
7751 | map<string, unsigned> module_index; | |
7752 | unsigned module_index_ctr = 0; | |
7753 | ||
7754 | // Discover and declare targets for each unique path. | |
cfcab6c7 | 7755 | s.op->newline() << "static struct stapiu_target " |
2b69faaf JS |
7756 | << "stap_inode_uprobe_targets[] = {"; |
7757 | s.op->indent(1); | |
7758 | for (unsigned i=0; i<probes.size(); i++) | |
7759 | { | |
7760 | uprobe_derived_probe *p = probes[i]; | |
cfcab6c7 JS |
7761 | const string key = make_pbm_key(p); |
7762 | if (module_index.find (key) == module_index.end()) | |
2b69faaf | 7763 | { |
cfcab6c7 JS |
7764 | module_index[key] = module_index_ctr++; |
7765 | s.op->newline() << "{"; | |
7766 | s.op->line() << " .finder={"; | |
7767 | if (p->pid != 0) | |
7768 | s.op->line() << " .pid=" << p->pid << ","; | |
7769 | ||
7770 | if (p->section == "") // .statement(addr).absolute XXX? | |
7771 | s.op->line() << " .callback=&stapiu_process_found,"; | |
7772 | else if (p->section == ".absolute") // proxy for ET_EXEC -> exec()'d program | |
7773 | { | |
7774 | s.op->line() << " .procname=" << lex_cast_qstring(p->module) << ","; | |
7775 | s.op->line() << " .callback=&stapiu_process_found,"; | |
7776 | } | |
7777 | else if (p->section != ".absolute") // ET_DYN | |
7778 | { | |
7779 | if (p->has_library) | |
7780 | s.op->line() << " .procname=\"" << p->path << "\", "; | |
7781 | s.op->line() << " .mmap_callback=&stapiu_mmap_found, "; | |
7782 | s.op->line() << " .munmap_callback=&stapiu_munmap_found, "; | |
7783 | s.op->line() << " .callback=&stapiu_process_munmap,"; | |
7784 | } | |
7785 | s.op->line() << " },"; | |
7786 | s.op->line() << " .filename=" << lex_cast_qstring(p->module) << ","; | |
7787 | s.op->line() << " },"; | |
2b69faaf JS |
7788 | } |
7789 | } | |
7790 | s.op->newline(-1) << "};"; | |
7791 | s.op->assert_0_indent(); | |
7792 | ||
7793 | // Declare the actual probes. | |
cfcab6c7 | 7794 | s.op->newline() << "static struct stapiu_consumer " |
2b69faaf JS |
7795 | << "stap_inode_uprobe_consumers[] = {"; |
7796 | s.op->indent(1); | |
7797 | for (unsigned i=0; i<probes.size(); i++) | |
7798 | { | |
7799 | uprobe_derived_probe *p = probes[i]; | |
cfcab6c7 JS |
7800 | unsigned index = module_index[make_pbm_key(p)]; |
7801 | s.op->newline() << "{"; | |
7802 | s.op->line() << " .consumer={ .handler=enter_inode_uprobe },"; | |
7803 | s.op->line() << " .target=&stap_inode_uprobe_targets[" << index << "],"; | |
7804 | s.op->line() << " .offset=(loff_t)0x" << hex << p->addr << dec << "ULL,"; | |
7805 | if (p->sdt_semaphore_addr) | |
7806 | s.op->line() << " .sdt_sem_offset=(loff_t)0x" | |
7807 | << hex << p->sdt_semaphore_addr << dec << "ULL,"; | |
7808 | s.op->line() << " .probe=" << common_probe_init (p) << ","; | |
7809 | s.op->line() << " },"; | |
2b69faaf JS |
7810 | } |
7811 | s.op->newline(-1) << "};"; | |
7812 | s.op->assert_0_indent(); | |
7813 | } | |
7814 | ||
7815 | ||
7816 | void | |
7817 | uprobe_derived_probe_group::emit_module_inode_init (systemtap_session& s) | |
7818 | { | |
7819 | if (probes.empty()) return; | |
7820 | s.op->newline() << "/* ---- inode uprobes ---- */"; | |
cfcab6c7 | 7821 | s.op->newline() << "rc = stapiu_init (" |
2b69faaf JS |
7822 | << "stap_inode_uprobe_targets, " |
7823 | << "ARRAY_SIZE(stap_inode_uprobe_targets), " | |
7824 | << "stap_inode_uprobe_consumers, " | |
7825 | << "ARRAY_SIZE(stap_inode_uprobe_consumers));"; | |
7826 | } | |
7827 | ||
7828 | ||
7829 | void | |
7830 | uprobe_derived_probe_group::emit_module_inode_exit (systemtap_session& s) | |
7831 | { | |
7832 | if (probes.empty()) return; | |
7833 | s.op->newline() << "/* ---- inode uprobes ---- */"; | |
cfcab6c7 | 7834 | s.op->newline() << "stapiu_exit (" |
2b69faaf JS |
7835 | << "stap_inode_uprobe_targets, " |
7836 | << "ARRAY_SIZE(stap_inode_uprobe_targets), " | |
7837 | << "stap_inode_uprobe_consumers, " | |
7838 | << "ARRAY_SIZE(stap_inode_uprobe_consumers));"; | |
7839 | } | |
7840 | ||
7841 | ||
7842 | void | |
7843 | uprobe_derived_probe_group::emit_module_decls (systemtap_session& s) | |
7844 | { | |
7845 | if (kernel_supports_inode_uprobes (s)) | |
7846 | emit_module_inode_decls (s); | |
7847 | else | |
7848 | emit_module_utrace_decls (s); | |
7849 | } | |
7850 | ||
7851 | ||
7852 | void | |
7853 | uprobe_derived_probe_group::emit_module_init (systemtap_session& s) | |
7854 | { | |
7855 | if (kernel_supports_inode_uprobes (s)) | |
7856 | emit_module_inode_init (s); | |
7857 | else | |
7858 | emit_module_utrace_init (s); | |
7859 | } | |
7860 | ||
7861 | ||
7862 | void | |
7863 | uprobe_derived_probe_group::emit_module_exit (systemtap_session& s) | |
7864 | { | |
7865 | if (kernel_supports_inode_uprobes (s)) | |
7866 | emit_module_inode_exit (s); | |
7867 | else | |
7868 | emit_module_utrace_exit (s); | |
7869 | } | |
7870 | ||
7871 | ||
e6fe60e7 AM |
7872 | // ------------------------------------------------------------------------ |
7873 | // Kprobe derived probes | |
7874 | // ------------------------------------------------------------------------ | |
7875 | ||
4627ed58 | 7876 | static const string TOK_KPROBE("kprobe"); |
935447c8 | 7877 | |
bae55db9 | 7878 | struct kprobe_derived_probe: public derived_probe |
d0ea46ce | 7879 | { |
bae55db9 JS |
7880 | kprobe_derived_probe (probe *base, |
7881 | probe_point *location, | |
7882 | const string& name, | |
7883 | int64_t stmt_addr, | |
7884 | bool has_return, | |
7885 | bool has_statement, | |
7886 | bool has_maxactive, | |
b642c901 SC |
7887 | bool has_path, |
7888 | bool has_library, | |
7889 | long maxactive_val, | |
7890 | const string& path, | |
7891 | const string& library | |
bae55db9 JS |
7892 | ); |
7893 | string symbol_name; | |
7894 | Dwarf_Addr addr; | |
7895 | bool has_return; | |
7896 | bool has_statement; | |
7897 | bool has_maxactive; | |
b642c901 SC |
7898 | bool has_path; |
7899 | bool has_library; | |
bae55db9 | 7900 | long maxactive_val; |
b642c901 SC |
7901 | string path; |
7902 | string library; | |
bae55db9 JS |
7903 | bool access_var; |
7904 | void printsig (std::ostream &o) const; | |
7905 | void join_group (systemtap_session& s); | |
7906 | }; | |
d0ea46ce | 7907 | |
bae55db9 JS |
7908 | struct kprobe_derived_probe_group: public derived_probe_group |
7909 | { | |
7910 | private: | |
7911 | multimap<string,kprobe_derived_probe*> probes_by_module; | |
7912 | typedef multimap<string,kprobe_derived_probe*>::iterator p_b_m_iterator; | |
d0ea46ce | 7913 | |
bae55db9 JS |
7914 | public: |
7915 | void enroll (kprobe_derived_probe* probe); | |
7916 | void emit_module_decls (systemtap_session& s); | |
7917 | void emit_module_init (systemtap_session& s); | |
7918 | void emit_module_exit (systemtap_session& s); | |
7919 | }; | |
d0ea46ce | 7920 | |
e6fe60e7 AM |
7921 | kprobe_derived_probe::kprobe_derived_probe (probe *base, |
7922 | probe_point *location, | |
b6371390 | 7923 | const string& name, |
e6fe60e7 | 7924 | int64_t stmt_addr, |
b6371390 JS |
7925 | bool has_return, |
7926 | bool has_statement, | |
7927 | bool has_maxactive, | |
b642c901 SC |
7928 | bool has_path, |
7929 | bool has_library, | |
7930 | long maxactive_val, | |
7931 | const string& path, | |
7932 | const string& library | |
b6371390 | 7933 | ): |
4c5d1300 | 7934 | derived_probe (base, location, true /* .components soon rewritten */ ), |
e6fe60e7 | 7935 | symbol_name (name), addr (stmt_addr), |
b6371390 | 7936 | has_return (has_return), has_statement (has_statement), |
b642c901 SC |
7937 | has_maxactive (has_maxactive), has_path (has_path), |
7938 | has_library (has_library), | |
7939 | maxactive_val (maxactive_val), | |
7940 | path (path), library (library) | |
e6fe60e7 AM |
7941 | { |
7942 | this->tok = base->tok; | |
7943 | this->access_var = false; | |
d0ea46ce | 7944 | |
e6fe60e7 AM |
7945 | #ifndef USHRT_MAX |
7946 | #define USHRT_MAX 32767 | |
7947 | #endif | |
d0ea46ce | 7948 | |
46856d8d JS |
7949 | // Expansion of $target variables in the probe body produces an error during |
7950 | // translate phase, since we're not using debuginfo | |
d0ea46ce | 7951 | |
e6fe60e7 | 7952 | vector<probe_point::component*> comps; |
46856d8d | 7953 | comps.push_back (new probe_point::component(TOK_KPROBE)); |
e6fe60e7 | 7954 | |
46856d8d JS |
7955 | if (has_statement) |
7956 | { | |
9ea68eb9 JS |
7957 | comps.push_back (new probe_point::component(TOK_STATEMENT, |
7958 | new literal_number(addr, true))); | |
46856d8d JS |
7959 | comps.push_back (new probe_point::component(TOK_ABSOLUTE)); |
7960 | } | |
7961 | else | |
7962 | { | |
7963 | size_t pos = name.find(':'); | |
7964 | if (pos != string::npos) | |
d0ea46ce | 7965 | { |
46856d8d JS |
7966 | string module = name.substr(0, pos); |
7967 | string function = name.substr(pos + 1); | |
7968 | comps.push_back (new probe_point::component(TOK_MODULE, new literal_string(module))); | |
7969 | comps.push_back (new probe_point::component(TOK_FUNCTION, new literal_string(function))); | |
7970 | } | |
7971 | else | |
7972 | comps.push_back (new probe_point::component(TOK_FUNCTION, new literal_string(name))); | |
46856d8d | 7973 | } |
d0ea46ce | 7974 | |
b6371390 JS |
7975 | if (has_return) |
7976 | comps.push_back (new probe_point::component(TOK_RETURN)); | |
7977 | if (has_maxactive) | |
7978 | comps.push_back (new probe_point::component(TOK_MAXACTIVE, new literal_number(maxactive_val))); | |
d0ea46ce | 7979 | |
e6fe60e7 AM |
7980 | this->sole_location()->components = comps; |
7981 | } | |
d0ea46ce | 7982 | |
e6fe60e7 AM |
7983 | void kprobe_derived_probe::printsig (ostream& o) const |
7984 | { | |
7985 | sole_location()->print (o); | |
7986 | o << " /* " << " name = " << symbol_name << "*/"; | |
7987 | printsig_nested (o); | |
7988 | } | |
d0ea46ce | 7989 | |
e6fe60e7 AM |
7990 | void kprobe_derived_probe::join_group (systemtap_session& s) |
7991 | { | |
d0ea46ce | 7992 | |
e6fe60e7 AM |
7993 | if (! s.kprobe_derived_probes) |
7994 | s.kprobe_derived_probes = new kprobe_derived_probe_group (); | |
7995 | s.kprobe_derived_probes->enroll (this); | |
d0ea46ce | 7996 | |
e6fe60e7 | 7997 | } |
d0ea46ce | 7998 | |
e6fe60e7 AM |
7999 | void kprobe_derived_probe_group::enroll (kprobe_derived_probe* p) |
8000 | { | |
8001 | probes_by_module.insert (make_pair (p->symbol_name, p)); | |
8002 | // probes of same symbol should share single kprobe/kretprobe | |
8003 | } | |
d0ea46ce | 8004 | |
e6fe60e7 AM |
8005 | void |
8006 | kprobe_derived_probe_group::emit_module_decls (systemtap_session& s) | |
8007 | { | |
8008 | if (probes_by_module.empty()) return; | |
d0ea46ce | 8009 | |
e6fe60e7 | 8010 | s.op->newline() << "/* ---- kprobe-based probes ---- */"; |
d0ea46ce | 8011 | |
e6fe60e7 AM |
8012 | // Warn of misconfigured kernels |
8013 | s.op->newline() << "#if ! defined(CONFIG_KPROBES)"; | |
8014 | s.op->newline() << "#error \"Need CONFIG_KPROBES!\""; | |
8015 | s.op->newline() << "#endif"; | |
8016 | s.op->newline(); | |
d0ea46ce | 8017 | |
f07c3b68 | 8018 | s.op->newline() << "#ifndef KRETACTIVE"; |
1ee6b5fc | 8019 | s.op->newline() << "#define KRETACTIVE (max(15,6*(int)num_possible_cpus()))"; |
f07c3b68 FCE |
8020 | s.op->newline() << "#endif"; |
8021 | ||
e6fe60e7 | 8022 | // Forward declare the master entry functions |
88747011 | 8023 | s.op->newline() << "static int enter_kprobe2_probe (struct kprobe *inst,"; |
e6fe60e7 | 8024 | s.op->line() << " struct pt_regs *regs);"; |
88747011 | 8025 | s.op->newline() << "static int enter_kretprobe2_probe (struct kretprobe_instance *inst,"; |
e6fe60e7 | 8026 | s.op->line() << " struct pt_regs *regs);"; |
d0ea46ce | 8027 | |
e6fe60e7 AM |
8028 | // Emit an array of kprobe/kretprobe pointers |
8029 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
c9116e99 | 8030 | s.op->newline() << "static void * stap_unreg_kprobes2[" << probes_by_module.size() << "];"; |
e6fe60e7 | 8031 | s.op->newline() << "#endif"; |
d0ea46ce | 8032 | |
e6fe60e7 | 8033 | // Emit the actual probe list. |
d0ea46ce | 8034 | |
e6fe60e7 AM |
8035 | s.op->newline() << "static struct stap_dwarfless_kprobe {"; |
8036 | s.op->newline(1) << "union { struct kprobe kp; struct kretprobe krp; } u;"; | |
8037 | s.op->newline() << "#ifdef __ia64__"; | |
8038 | s.op->newline() << "struct kprobe dummy;"; | |
8039 | s.op->newline() << "#endif"; | |
8040 | s.op->newline(-1) << "} stap_dwarfless_kprobes[" << probes_by_module.size() << "];"; | |
8041 | // NB: bss! | |
d0ea46ce | 8042 | |
e6fe60e7 AM |
8043 | s.op->newline() << "static struct stap_dwarfless_probe {"; |
8044 | s.op->newline(1) << "const unsigned return_p:1;"; | |
8045 | s.op->newline() << "const unsigned maxactive_p:1;"; | |
b350f56b | 8046 | s.op->newline() << "const unsigned optional_p:1;"; |
e6fe60e7 AM |
8047 | s.op->newline() << "unsigned registered_p:1;"; |
8048 | s.op->newline() << "const unsigned short maxactive_val;"; | |
935447c8 | 8049 | |
e6fe60e7 AM |
8050 | // Function Names are mostly small and uniform enough to justify putting |
8051 | // char[MAX]'s into the array instead of relocated char*'s. | |
935447c8 | 8052 | |
faea5e16 JS |
8053 | size_t symbol_string_name_max = 0; |
8054 | size_t symbol_string_name_tot = 0; | |
e6fe60e7 | 8055 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) |
6270adc1 | 8056 | { |
e6fe60e7 AM |
8057 | kprobe_derived_probe* p = it->second; |
8058 | #define DOIT(var,expr) do { \ | |
8059 | size_t var##_size = (expr) + 1; \ | |
8060 | var##_max = max (var##_max, var##_size); \ | |
8061 | var##_tot += var##_size; } while (0) | |
e6fe60e7 AM |
8062 | DOIT(symbol_string_name, p->symbol_name.size()); |
8063 | #undef DOIT | |
6270adc1 MH |
8064 | } |
8065 | ||
e6fe60e7 AM |
8066 | #define CALCIT(var) \ |
8067 | s.op->newline() << "const char " << #var << "[" << var##_name_max << "] ;"; | |
935447c8 | 8068 | |
e6fe60e7 AM |
8069 | CALCIT(symbol_string); |
8070 | #undef CALCIT | |
6270adc1 | 8071 | |
bd659351 | 8072 | s.op->newline() << "unsigned long address;"; |
26e63673 | 8073 | s.op->newline() << "struct stap_probe * const probe;"; |
e6fe60e7 AM |
8074 | s.op->newline(-1) << "} stap_dwarfless_probes[] = {"; |
8075 | s.op->indent(1); | |
6270adc1 | 8076 | |
e6fe60e7 AM |
8077 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) |
8078 | { | |
8079 | kprobe_derived_probe* p = it->second; | |
8080 | s.op->newline() << "{"; | |
8081 | if (p->has_return) | |
8082 | s.op->line() << " .return_p=1,"; | |
6270adc1 | 8083 | |
e6fe60e7 AM |
8084 | if (p->has_maxactive) |
8085 | { | |
8086 | s.op->line() << " .maxactive_p=1,"; | |
8087 | assert (p->maxactive_val >= 0 && p->maxactive_val <= USHRT_MAX); | |
8088 | s.op->line() << " .maxactive_val=" << p->maxactive_val << ","; | |
8089 | } | |
6270adc1 | 8090 | |
b350f56b JS |
8091 | if (p->locations[0]->optional) |
8092 | s.op->line() << " .optional_p=1,"; | |
8093 | ||
e6fe60e7 | 8094 | if (p->has_statement) |
c8d9d15e | 8095 | s.op->line() << " .address=(unsigned long)0x" << hex << p->addr << dec << "ULL,"; |
e6fe60e7 | 8096 | else |
c8d9d15e | 8097 | s.op->line() << " .symbol_string=\"" << p->symbol_name << "\","; |
5d67b47c | 8098 | |
faea5e16 | 8099 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
e6fe60e7 | 8100 | s.op->line() << " },"; |
935447c8 DS |
8101 | } |
8102 | ||
e6fe60e7 | 8103 | s.op->newline(-1) << "};"; |
5d67b47c | 8104 | |
e6fe60e7 AM |
8105 | // Emit the kprobes callback function |
8106 | s.op->newline(); | |
88747011 | 8107 | s.op->newline() << "static int enter_kprobe2_probe (struct kprobe *inst,"; |
e6fe60e7 AM |
8108 | s.op->line() << " struct pt_regs *regs) {"; |
8109 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS | |
8110 | s.op->newline(1) << "int kprobe_idx = ((uintptr_t)inst-(uintptr_t)stap_dwarfless_kprobes)/sizeof(struct stap_dwarfless_kprobe);"; | |
8111 | // Check that the index is plausible | |
8112 | s.op->newline() << "struct stap_dwarfless_probe *sdp = &stap_dwarfless_probes["; | |
8113 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
8114 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
8115 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
8116 | s.op->line() << "];"; | |
6eefe942 MW |
8117 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->probe", |
8118 | "_STP_PROBE_HANDLER_KPROBE"); | |
d9aed31e | 8119 | s.op->newline() << "c->kregs = regs;"; |
6415ddde MW |
8120 | |
8121 | // Make it look like the IP is set as it wouldn't have been replaced | |
8122 | // by a breakpoint instruction when calling real probe handler. Reset | |
8123 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
8124 | s.op->newline() << "{"; | |
8125 | s.op->indent(1); | |
d9aed31e | 8126 | s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
259d54c0 | 8127 | s.op->newline() << "SET_REG_IP(regs, (unsigned long) inst->addr);"; |
26e63673 | 8128 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
259d54c0 | 8129 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
8130 | s.op->newline(-1) << "}"; |
8131 | ||
7baf48e9 | 8132 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
e6fe60e7 AM |
8133 | s.op->newline() << "return 0;"; |
8134 | s.op->newline(-1) << "}"; | |
935447c8 | 8135 | |
e6fe60e7 AM |
8136 | // Same for kretprobes |
8137 | s.op->newline(); | |
88747011 | 8138 | s.op->newline() << "static int enter_kretprobe2_probe (struct kretprobe_instance *inst,"; |
e6fe60e7 AM |
8139 | s.op->line() << " struct pt_regs *regs) {"; |
8140 | s.op->newline(1) << "struct kretprobe *krp = inst->rp;"; | |
935447c8 | 8141 | |
e6fe60e7 AM |
8142 | // NB: as of PR5673, the kprobe|kretprobe union struct is in BSS |
8143 | s.op->newline() << "int kprobe_idx = ((uintptr_t)krp-(uintptr_t)stap_dwarfless_kprobes)/sizeof(struct stap_dwarfless_kprobe);"; | |
8144 | // Check that the index is plausible | |
8145 | s.op->newline() << "struct stap_dwarfless_probe *sdp = &stap_dwarfless_probes["; | |
8146 | s.op->line() << "((kprobe_idx >= 0 && kprobe_idx < " << probes_by_module.size() << ")?"; | |
8147 | s.op->line() << "kprobe_idx:0)"; // NB: at least we avoid memory corruption | |
8148 | // XXX: it would be nice to give a more verbose error though; BUG_ON later? | |
8149 | s.op->line() << "];"; | |
935447c8 | 8150 | |
6eefe942 MW |
8151 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->probe", |
8152 | "_STP_PROBE_HANDLER_KRETPROBE"); | |
d9aed31e | 8153 | s.op->newline() << "c->kregs = regs;"; |
6dceb5c9 | 8154 | s.op->newline() << "c->ips.krp.pi = inst;"; // for assisting runtime's backtrace logic |
6415ddde MW |
8155 | |
8156 | // Make it look like the IP is set as it wouldn't have been replaced | |
8157 | // by a breakpoint instruction when calling real probe handler. Reset | |
8158 | // IP regs on return, so we don't confuse kprobes. PR10458 | |
8159 | s.op->newline() << "{"; | |
8160 | s.op->indent(1); | |
d9aed31e | 8161 | s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->kregs);"; |
259d54c0 | 8162 | s.op->newline() << "SET_REG_IP(regs, (unsigned long) inst->rp->kp.addr);"; |
26e63673 | 8163 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
259d54c0 | 8164 | s.op->newline() << "SET_REG_IP(regs, kprobes_ip);"; |
6415ddde MW |
8165 | s.op->newline(-1) << "}"; |
8166 | ||
7baf48e9 | 8167 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
e6fe60e7 AM |
8168 | s.op->newline() << "return 0;"; |
8169 | s.op->newline(-1) << "}"; | |
bd659351 | 8170 | |
03a4ec63 | 8171 | s.op->newline() << "#ifdef STAPCONF_KALLSYMS_ON_EACH_SYMBOL"; |
bd659351 MW |
8172 | s.op->newline() << "static int kprobe_resolve(void *data, const char *name,"; |
8173 | s.op->newline() << " struct module *owner,"; | |
8174 | s.op->newline() << " unsigned long val) {"; | |
8175 | s.op->newline(1) << "int i;"; | |
fc1d2aa2 MW |
8176 | s.op->newline() << "int *p = (int *) data;"; |
8177 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() | |
8178 | << " && *p > 0; i++) {"; | |
bd659351 MW |
8179 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; |
8180 | s.op->newline() << "if (! sdp->address)"; | |
fc1d2aa2 | 8181 | s.op->newline(1) << "if (strcmp(sdp->symbol_string, name) == 0) {"; |
bd659351 | 8182 | s.op->newline(1) << "sdp->address = val;"; |
fc1d2aa2 MW |
8183 | s.op->newline() << "(*p)--;"; |
8184 | s.op->newline(-1) << "}"; | |
8185 | s.op->newline(-2) << "}"; | |
8186 | s.op->newline() << "return (p > 0) ? 0 : -1;"; | |
bd659351 | 8187 | s.op->newline(-1) << "}"; |
03a4ec63 | 8188 | s.op->newline() << "#endif"; |
935447c8 DS |
8189 | } |
8190 | ||
e6fe60e7 | 8191 | |
6270adc1 | 8192 | void |
e6fe60e7 | 8193 | kprobe_derived_probe_group::emit_module_init (systemtap_session& s) |
6270adc1 | 8194 | { |
03a4ec63 | 8195 | s.op->newline() << "#ifdef STAPCONF_KALLSYMS_ON_EACH_SYMBOL"; |
fc1d2aa2 MW |
8196 | s.op->newline() << "{"; |
8197 | s.op->newline(1) << "int p = 0;"; | |
8198 | s.op->newline() << "for (i = 0; i < " << probes_by_module.size() << "; i++) {"; | |
8199 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
8200 | s.op->newline() << "if (! sdp->address)"; | |
8201 | s.op->newline(1) << "p++;"; | |
8202 | s.op->newline(-2) << "}"; | |
8203 | s.op->newline() << "kallsyms_on_each_symbol(kprobe_resolve, &p);"; | |
8204 | s.op->newline(-1) << "}"; | |
03a4ec63 | 8205 | s.op->newline() << "#endif"; |
bd659351 | 8206 | |
e6fe60e7 | 8207 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
c8d9d15e | 8208 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; |
e6fe60e7 | 8209 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; |
c8d9d15e | 8210 | s.op->newline() << "void *addr = (void *) sdp->address;"; |
03a4ec63 MW |
8211 | s.op->newline() << "const char *symbol_name = addr ? NULL : sdp->symbol_string;"; |
8212 | ||
8213 | s.op->newline() << "#ifdef STAPCONF_KALLSYMS_ON_EACH_SYMBOL"; | |
bd659351 MW |
8214 | s.op->newline() << "if (! addr) {"; |
8215 | s.op->newline(1) << "sdp->registered_p = 0;"; | |
9319b767 MW |
8216 | s.op->newline() << "if (!sdp->optional_p)"; |
8217 | s.op->newline(1) << "_stp_warn (\"probe %s registration error (symbol not found)\", probe_point);"; | |
8218 | s.op->newline(-1) << "continue;"; | |
bd659351 | 8219 | s.op->newline(-1) << "}"; |
03a4ec63 MW |
8220 | s.op->newline() << "#endif"; |
8221 | ||
26e63673 | 8222 | s.op->newline() << "probe_point = sdp->probe->pp;"; // for error messages |
e6fe60e7 | 8223 | s.op->newline() << "if (sdp->return_p) {"; |
c8d9d15e | 8224 | s.op->newline(1) << "kp->u.krp.kp.addr = addr;"; |
766cee5f | 8225 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
03a4ec63 | 8226 | s.op->newline() << "kp->u.krp.kp.symbol_name = (char *) symbol_name;"; |
766cee5f | 8227 | s.op->newline() << "#endif"; |
e6fe60e7 AM |
8228 | s.op->newline() << "if (sdp->maxactive_p) {"; |
8229 | s.op->newline(1) << "kp->u.krp.maxactive = sdp->maxactive_val;"; | |
8230 | s.op->newline(-1) << "} else {"; | |
f07c3b68 | 8231 | s.op->newline(1) << "kp->u.krp.maxactive = KRETACTIVE;"; |
e6fe60e7 | 8232 | s.op->newline(-1) << "}"; |
88747011 | 8233 | s.op->newline() << "kp->u.krp.handler = &enter_kretprobe2_probe;"; |
e6fe60e7 AM |
8234 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 |
8235 | s.op->newline() << "#ifdef __ia64__"; | |
e6fe60e7 | 8236 | s.op->newline() << "kp->dummy.addr = kp->u.krp.kp.addr;"; |
766cee5f | 8237 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
c8d9d15e | 8238 | s.op->newline() << "kp->dummy.symbol_name = kp->u.krp.kp.symbol_name;"; |
766cee5f | 8239 | s.op->newline() << "#endif"; |
c8d9d15e | 8240 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; |
e6fe60e7 AM |
8241 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; |
8242 | s.op->newline() << "if (rc == 0) {"; | |
8243 | s.op->newline(1) << "rc = register_kretprobe (& kp->u.krp);"; | |
8244 | s.op->newline() << "if (rc != 0)"; | |
8245 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
8246 | s.op->newline(-2) << "}"; | |
8247 | s.op->newline() << "#else"; | |
8248 | s.op->newline() << "rc = register_kretprobe (& kp->u.krp);"; | |
8249 | s.op->newline() << "#endif"; | |
8250 | s.op->newline(-1) << "} else {"; | |
8251 | // to ensure safeness of bspcache, always use aggr_kprobe on ia64 | |
c8d9d15e | 8252 | s.op->newline(1) << "kp->u.kp.addr = addr;"; |
766cee5f | 8253 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
03a4ec63 | 8254 | s.op->newline() << "kp->u.kp.symbol_name = (char *) symbol_name;"; |
766cee5f | 8255 | s.op->newline() << "#endif"; |
88747011 | 8256 | s.op->newline() << "kp->u.kp.pre_handler = &enter_kprobe2_probe;"; |
e6fe60e7 | 8257 | s.op->newline() << "#ifdef __ia64__"; |
e6fe60e7 | 8258 | s.op->newline() << "kp->dummy.pre_handler = NULL;"; |
c8d9d15e | 8259 | s.op->newline() << "kp->dummy.addr = kp->u.kp.addr;"; |
766cee5f | 8260 | s.op->newline() << "#ifdef STAPCONF_KPROBE_SYMBOL_NAME"; |
c8d9d15e | 8261 | s.op->newline() << "kp->dummy.symbol_name = kp->u.kp.symbol_name;"; |
766cee5f | 8262 | s.op->newline() << "#endif"; |
e6fe60e7 AM |
8263 | s.op->newline() << "rc = register_kprobe (& kp->dummy);"; |
8264 | s.op->newline() << "if (rc == 0) {"; | |
8265 | s.op->newline(1) << "rc = register_kprobe (& kp->u.kp);"; | |
8266 | s.op->newline() << "if (rc != 0)"; | |
8267 | s.op->newline(1) << "unregister_kprobe (& kp->dummy);"; | |
8268 | s.op->newline(-2) << "}"; | |
8269 | s.op->newline() << "#else"; | |
8270 | s.op->newline() << "rc = register_kprobe (& kp->u.kp);"; | |
8271 | s.op->newline() << "#endif"; | |
8272 | s.op->newline(-1) << "}"; | |
8273 | s.op->newline() << "if (rc) {"; // PR6749: tolerate a failed register_*probe. | |
8274 | s.op->newline(1) << "sdp->registered_p = 0;"; | |
b350f56b | 8275 | s.op->newline() << "if (!sdp->optional_p)"; |
50b6acf7 | 8276 | s.op->newline(1) << "_stp_warn (\"probe %s (address 0x%lx) registration error (rc %d)\", probe_point, (unsigned long) addr, rc);"; |
b350f56b | 8277 | s.op->newline(-1) << "rc = 0;"; // continue with other probes |
e6fe60e7 AM |
8278 | // XXX: shall we increment numskipped? |
8279 | s.op->newline(-1) << "}"; | |
6270adc1 | 8280 | |
e6fe60e7 AM |
8281 | s.op->newline() << "else sdp->registered_p = 1;"; |
8282 | s.op->newline(-1) << "}"; // for loop | |
6270adc1 MH |
8283 | } |
8284 | ||
b4be7cbc | 8285 | |
e6fe60e7 AM |
8286 | void |
8287 | kprobe_derived_probe_group::emit_module_exit (systemtap_session& s) | |
935447c8 | 8288 | { |
e6fe60e7 AM |
8289 | //Unregister kprobes by batch interfaces. |
8290 | s.op->newline() << "#if defined(STAPCONF_UNREGISTER_KPROBES)"; | |
8291 | s.op->newline() << "j = 0;"; | |
8292 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
8293 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
8294 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
8295 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
8296 | s.op->newline() << "if (!sdp->return_p)"; | |
c9116e99 | 8297 | s.op->newline(1) << "stap_unreg_kprobes2[j++] = &kp->u.kp;"; |
e6fe60e7 | 8298 | s.op->newline(-2) << "}"; |
c9116e99 | 8299 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes2, j);"; |
e6fe60e7 AM |
8300 | s.op->newline() << "j = 0;"; |
8301 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
8302 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
8303 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
8304 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
8305 | s.op->newline() << "if (sdp->return_p)"; | |
c9116e99 | 8306 | s.op->newline(1) << "stap_unreg_kprobes2[j++] = &kp->u.krp;"; |
e6fe60e7 | 8307 | s.op->newline(-2) << "}"; |
c9116e99 | 8308 | s.op->newline() << "unregister_kretprobes((struct kretprobe **)stap_unreg_kprobes2, j);"; |
e6fe60e7 AM |
8309 | s.op->newline() << "#ifdef __ia64__"; |
8310 | s.op->newline() << "j = 0;"; | |
8311 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
8312 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
8313 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
8314 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
c9116e99 | 8315 | s.op->newline() << "stap_unreg_kprobes2[j++] = &kp->dummy;"; |
e6fe60e7 | 8316 | s.op->newline(-1) << "}"; |
c9116e99 | 8317 | s.op->newline() << "unregister_kprobes((struct kprobe **)stap_unreg_kprobes2, j);"; |
e6fe60e7 AM |
8318 | s.op->newline() << "#endif"; |
8319 | s.op->newline() << "#endif"; | |
3e3bd7b6 | 8320 | |
e6fe60e7 AM |
8321 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
8322 | s.op->newline(1) << "struct stap_dwarfless_probe *sdp = & stap_dwarfless_probes[i];"; | |
8323 | s.op->newline() << "struct stap_dwarfless_kprobe *kp = & stap_dwarfless_kprobes[i];"; | |
8324 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
8325 | s.op->newline() << "if (sdp->return_p) {"; | |
8326 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; | |
8327 | s.op->newline(1) << "unregister_kretprobe (&kp->u.krp);"; | |
8328 | s.op->newline() << "#endif"; | |
8329 | s.op->newline() << "atomic_add (kp->u.krp.nmissed, & skipped_count);"; | |
8330 | s.op->newline() << "#ifdef STP_TIMING"; | |
8331 | s.op->newline() << "if (kp->u.krp.nmissed)"; | |
26e63673 | 8332 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kretprobe/1 on '%s': %d\\n\", sdp->probe->pp, kp->u.krp.nmissed);"; |
e6fe60e7 AM |
8333 | s.op->newline(-1) << "#endif"; |
8334 | s.op->newline() << "atomic_add (kp->u.krp.kp.nmissed, & skipped_count);"; | |
8335 | s.op->newline() << "#ifdef STP_TIMING"; | |
8336 | s.op->newline() << "if (kp->u.krp.kp.nmissed)"; | |
26e63673 | 8337 | 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 |
8338 | s.op->newline(-1) << "#endif"; |
8339 | s.op->newline(-1) << "} else {"; | |
8340 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES)"; | |
8341 | s.op->newline(1) << "unregister_kprobe (&kp->u.kp);"; | |
8342 | s.op->newline() << "#endif"; | |
8343 | s.op->newline() << "atomic_add (kp->u.kp.nmissed, & skipped_count);"; | |
8344 | s.op->newline() << "#ifdef STP_TIMING"; | |
8345 | s.op->newline() << "if (kp->u.kp.nmissed)"; | |
26e63673 | 8346 | s.op->newline(1) << "_stp_warn (\"Skipped due to missed kprobe on '%s': %lu\\n\", sdp->probe->pp, kp->u.kp.nmissed);"; |
e6fe60e7 AM |
8347 | s.op->newline(-1) << "#endif"; |
8348 | s.op->newline(-1) << "}"; | |
8349 | s.op->newline() << "#if !defined(STAPCONF_UNREGISTER_KPROBES) && defined(__ia64__)"; | |
8350 | s.op->newline() << "unregister_kprobe (&kp->dummy);"; | |
8351 | s.op->newline() << "#endif"; | |
8352 | s.op->newline() << "sdp->registered_p = 0;"; | |
8353 | s.op->newline(-1) << "}"; | |
f8a968bc JS |
8354 | } |
8355 | ||
e6fe60e7 | 8356 | struct kprobe_builder: public derived_probe_builder |
3c1b3d06 | 8357 | { |
e6fe60e7 AM |
8358 | kprobe_builder() {} |
8359 | virtual void build(systemtap_session & sess, | |
8360 | probe * base, | |
8361 | probe_point * location, | |
8362 | literal_map_t const & parameters, | |
8363 | vector<derived_probe *> & finished_results); | |
8364 | }; | |
3c1b3d06 FCE |
8365 | |
8366 | ||
79189b84 | 8367 | void |
05fb3e0c | 8368 | kprobe_builder::build(systemtap_session & sess, |
e6fe60e7 AM |
8369 | probe * base, |
8370 | probe_point * location, | |
8371 | literal_map_t const & parameters, | |
8372 | vector<derived_probe *> & finished_results) | |
79189b84 | 8373 | { |
e6fe60e7 | 8374 | string function_string_val, module_string_val; |
05fb3e0c | 8375 | string path, library, path_tgt, library_tgt; |
b6371390 JS |
8376 | int64_t statement_num_val = 0, maxactive_val = 0; |
8377 | bool has_function_str, has_module_str, has_statement_num; | |
8378 | bool has_absolute, has_return, has_maxactive; | |
b642c901 | 8379 | bool has_path, has_library; |
79189b84 | 8380 | |
b6371390 JS |
8381 | has_function_str = get_param(parameters, TOK_FUNCTION, function_string_val); |
8382 | has_module_str = get_param(parameters, TOK_MODULE, module_string_val); | |
8383 | has_return = has_null_param (parameters, TOK_RETURN); | |
8384 | has_maxactive = get_param(parameters, TOK_MAXACTIVE, maxactive_val); | |
8385 | has_statement_num = get_param(parameters, TOK_STATEMENT, statement_num_val); | |
8386 | has_absolute = has_null_param (parameters, TOK_ABSOLUTE); | |
b642c901 SC |
8387 | has_path = get_param (parameters, TOK_PROCESS, path); |
8388 | has_library = get_param (parameters, TOK_LIBRARY, library); | |
8389 | ||
8390 | if (has_path) | |
05fb3e0c WF |
8391 | { |
8392 | path = find_executable (path, sess.sysroot, sess.sysenv); | |
8393 | path_tgt = path_remove_sysroot(sess, path); | |
8394 | } | |
b642c901 | 8395 | if (has_library) |
05fb3e0c WF |
8396 | { |
8397 | library = find_executable (library, sess.sysroot, sess.sysenv, | |
8398 | "LD_LIBRARY_PATH"); | |
8399 | library_tgt = path_remove_sysroot(sess, library); | |
8400 | } | |
c57ea854 | 8401 | |
b6371390 | 8402 | if (has_function_str) |
6fb70fb7 | 8403 | { |
b6371390 JS |
8404 | if (has_module_str) |
8405 | function_string_val = module_string_val + ":" + function_string_val; | |
86758d5f | 8406 | |
b6371390 JS |
8407 | finished_results.push_back (new kprobe_derived_probe (base, |
8408 | location, function_string_val, | |
8409 | 0, has_return, | |
8410 | has_statement_num, | |
8411 | has_maxactive, | |
b642c901 SC |
8412 | has_path, |
8413 | has_library, | |
8414 | maxactive_val, | |
05fb3e0c WF |
8415 | path_tgt, |
8416 | library_tgt)); | |
6fb70fb7 | 8417 | } |
e6fe60e7 | 8418 | else |
b6371390 JS |
8419 | { |
8420 | // assert guru mode for absolute probes | |
8421 | if ( has_statement_num && has_absolute && !base->privileged ) | |
e3bbc038 | 8422 | throw semantic_error (_("absolute statement probe in unprivileged script; need stap -g"), base->tok); |
b6371390 JS |
8423 | |
8424 | finished_results.push_back (new kprobe_derived_probe (base, | |
8425 | location, "", | |
8426 | statement_num_val, | |
8427 | has_return, | |
8428 | has_statement_num, | |
8429 | has_maxactive, | |
b642c901 SC |
8430 | has_path, |
8431 | has_library, | |
8432 | maxactive_val, | |
05fb3e0c WF |
8433 | path_tgt, |
8434 | library_tgt)); | |
96b030fe | 8435 | } |
79189b84 JS |
8436 | } |
8437 | ||
dd225250 PS |
8438 | // ------------------------------------------------------------------------ |
8439 | // Hardware breakpoint based probes. | |
8440 | // ------------------------------------------------------------------------ | |
8441 | ||
8442 | static const string TOK_HWBKPT("data"); | |
8443 | static const string TOK_HWBKPT_WRITE("write"); | |
8444 | static const string TOK_HWBKPT_RW("rw"); | |
8445 | static const string TOK_LENGTH("length"); | |
8446 | ||
8447 | #define HWBKPT_READ 0 | |
8448 | #define HWBKPT_WRITE 1 | |
8449 | #define HWBKPT_RW 2 | |
8450 | struct hwbkpt_derived_probe: public derived_probe | |
8451 | { | |
8452 | hwbkpt_derived_probe (probe *base, | |
8453 | probe_point *location, | |
8454 | uint64_t addr, | |
8455 | string symname, | |
8456 | unsigned int len, | |
8457 | bool has_only_read_access, | |
8458 | bool has_only_write_access, | |
8459 | bool has_rw_access | |
8460 | ); | |
8461 | Dwarf_Addr hwbkpt_addr; | |
8462 | string symbol_name; | |
8463 | unsigned int hwbkpt_access,hwbkpt_len; | |
8464 | ||
8465 | void printsig (std::ostream &o) const; | |
8466 | void join_group (systemtap_session& s); | |
8467 | }; | |
8468 | ||
8469 | struct hwbkpt_derived_probe_group: public derived_probe_group | |
8470 | { | |
dd225250 | 8471 | private: |
dac77b80 | 8472 | vector<hwbkpt_derived_probe*> hwbkpt_probes; |
dd225250 PS |
8473 | |
8474 | public: | |
8475 | void enroll (hwbkpt_derived_probe* probe, systemtap_session& s); | |
8476 | void emit_module_decls (systemtap_session& s); | |
8477 | void emit_module_init (systemtap_session& s); | |
8478 | void emit_module_exit (systemtap_session& s); | |
8479 | }; | |
8480 | ||
8481 | hwbkpt_derived_probe::hwbkpt_derived_probe (probe *base, | |
9ea68eb9 JS |
8482 | probe_point *location, |
8483 | uint64_t addr, | |
8484 | string symname, | |
8485 | unsigned int len, | |
8486 | bool has_only_read_access, | |
8487 | bool has_only_write_access, | |
822a6a3d | 8488 | bool): |
4c5d1300 | 8489 | derived_probe (base, location, true /* .components soon rewritten */ ), |
dd225250 PS |
8490 | hwbkpt_addr (addr), |
8491 | symbol_name (symname), | |
8492 | hwbkpt_len (len) | |
8493 | { | |
8494 | this->tok = base->tok; | |
8495 | ||
8496 | vector<probe_point::component*> comps; | |
8497 | comps.push_back (new probe_point::component(TOK_KERNEL)); | |
8498 | ||
8499 | if (hwbkpt_addr) | |
9ea68eb9 JS |
8500 | comps.push_back (new probe_point::component (TOK_HWBKPT, |
8501 | new literal_number(hwbkpt_addr, true))); | |
8502 | else if (symbol_name.size()) | |
8503 | comps.push_back (new probe_point::component (TOK_HWBKPT, new literal_string(symbol_name))); | |
dd225250 PS |
8504 | |
8505 | comps.push_back (new probe_point::component (TOK_LENGTH, new literal_number(hwbkpt_len))); | |
8506 | ||
8507 | if (has_only_read_access) | |
9ea68eb9 | 8508 | this->hwbkpt_access = HWBKPT_READ ; |
dd225250 PS |
8509 | //TODO add code for comps.push_back for read, since this flag is not for x86 |
8510 | ||
8511 | else | |
9ea68eb9 JS |
8512 | { |
8513 | if (has_only_write_access) | |
8514 | { | |
8515 | this->hwbkpt_access = HWBKPT_WRITE ; | |
8516 | comps.push_back (new probe_point::component(TOK_HWBKPT_WRITE)); | |
8517 | } | |
8518 | else | |
8519 | { | |
8520 | this->hwbkpt_access = HWBKPT_RW ; | |
8521 | comps.push_back (new probe_point::component(TOK_HWBKPT_RW)); | |
8522 | } | |
8523 | } | |
dd225250 PS |
8524 | |
8525 | this->sole_location()->components = comps; | |
8526 | } | |
8527 | ||
8528 | void hwbkpt_derived_probe::printsig (ostream& o) const | |
8529 | { | |
8530 | sole_location()->print (o); | |
8531 | printsig_nested (o); | |
8532 | } | |
8533 | ||
8534 | void hwbkpt_derived_probe::join_group (systemtap_session& s) | |
8535 | { | |
dac77b80 FCE |
8536 | if (! s.hwbkpt_derived_probes) |
8537 | s.hwbkpt_derived_probes = new hwbkpt_derived_probe_group (); | |
dd225250 PS |
8538 | s.hwbkpt_derived_probes->enroll (this, s); |
8539 | } | |
8540 | ||
8541 | void hwbkpt_derived_probe_group::enroll (hwbkpt_derived_probe* p, systemtap_session& s) | |
8542 | { | |
dac77b80 FCE |
8543 | hwbkpt_probes.push_back (p); |
8544 | ||
8545 | unsigned max_hwbkpt_probes_by_arch = 0; | |
8546 | if (s.architecture == "i386" || s.architecture == "x86_64") | |
8547 | max_hwbkpt_probes_by_arch = 4; | |
8548 | else if (s.architecture == "s390") | |
8549 | max_hwbkpt_probes_by_arch = 1; | |
8550 | ||
c57ea854 | 8551 | if (hwbkpt_probes.size() >= max_hwbkpt_probes_by_arch) |
2713ea24 | 8552 | s.print_warning (_F("Too many hardware breakpoint probes requested for %s (%zu vs. %u)", |
b530b5b3 | 8553 | s.architecture.c_str(), hwbkpt_probes.size(), max_hwbkpt_probes_by_arch)); |
dd225250 PS |
8554 | } |
8555 | ||
8556 | void | |
8557 | hwbkpt_derived_probe_group::emit_module_decls (systemtap_session& s) | |
8558 | { | |
dac77b80 | 8559 | if (hwbkpt_probes.empty()) return; |
dd225250 PS |
8560 | |
8561 | s.op->newline() << "/* ---- hwbkpt-based probes ---- */"; | |
8562 | ||
8563 | s.op->newline() << "#include <linux/perf_event.h>"; | |
8564 | s.op->newline() << "#include <linux/hw_breakpoint.h>"; | |
8565 | s.op->newline(); | |
8566 | ||
8567 | // Forward declare the master entry functions | |
8568 | s.op->newline() << "static int enter_hwbkpt_probe (struct perf_event *bp,"; | |
8569 | s.op->line() << " int nmi,"; | |
8570 | s.op->line() << " struct perf_sample_data *data,"; | |
8571 | s.op->line() << " struct pt_regs *regs);"; | |
79189b84 | 8572 | |
dd225250 PS |
8573 | // Emit the actual probe list. |
8574 | ||
8575 | s.op->newline() << "static struct perf_event_attr "; | |
dac77b80 | 8576 | s.op->newline() << "stap_hwbkpt_probe_array[" << hwbkpt_probes.size() << "];"; |
dd225250 PS |
8577 | |
8578 | s.op->newline() << "static struct perf_event **"; | |
dac77b80 | 8579 | s.op->newline() << "stap_hwbkpt_ret_array[" << hwbkpt_probes.size() << "];"; |
dd225250 PS |
8580 | s.op->newline() << "static struct stap_hwbkpt_probe {"; |
8581 | s.op->newline() << "int registered_p:1;"; | |
43650b10 | 8582 | // registered_p = 0 signifies a probe that is unregistered (or failed) |
dd225250 PS |
8583 | // registered_p = 1 signifies a probe that got registered successfully |
8584 | ||
faea5e16 | 8585 | // Symbol Names are mostly small and uniform enough |
dd225250 | 8586 | // to justify putting const char*. |
dac77b80 | 8587 | s.op->newline() << "const char * const symbol;"; |
dd225250 PS |
8588 | |
8589 | s.op->newline() << "const unsigned long address;"; | |
8590 | s.op->newline() << "uint8_t atype;"; | |
bb0a4e12 | 8591 | s.op->newline() << "unsigned int len;"; |
26e63673 | 8592 | s.op->newline() << "struct stap_probe * const probe;"; |
dd225250 PS |
8593 | s.op->newline() << "} stap_hwbkpt_probes[] = {"; |
8594 | s.op->indent(1); | |
8595 | ||
dac77b80 | 8596 | for (unsigned int it = 0; it < hwbkpt_probes.size(); it++) |
dd225250 | 8597 | { |
dac77b80 | 8598 | hwbkpt_derived_probe* p = hwbkpt_probes.at(it); |
dd225250 | 8599 | s.op->newline() << "{"; |
dd225250 PS |
8600 | if (p->symbol_name.size()) |
8601 | s.op->line() << " .address=(unsigned long)0x0" << "ULL,"; | |
8602 | else | |
8603 | s.op->line() << " .address=(unsigned long)0x" << hex << p->hwbkpt_addr << dec << "ULL,"; | |
8604 | switch(p->hwbkpt_access){ | |
8605 | case HWBKPT_READ: | |
8606 | s.op->line() << " .atype=HW_BREAKPOINT_R ,"; | |
bb0a4e12 | 8607 | break; |
dd225250 PS |
8608 | case HWBKPT_WRITE: |
8609 | s.op->line() << " .atype=HW_BREAKPOINT_W ,"; | |
bb0a4e12 | 8610 | break; |
dd225250 PS |
8611 | case HWBKPT_RW: |
8612 | s.op->line() << " .atype=HW_BREAKPOINT_R|HW_BREAKPOINT_W ,"; | |
bb0a4e12 | 8613 | break; |
dd225250 PS |
8614 | }; |
8615 | s.op->line() << " .len=" << p->hwbkpt_len << ","; | |
faea5e16 | 8616 | s.op->line() << " .probe=" << common_probe_init (p) << ","; |
dd225250 | 8617 | s.op->line() << " .symbol=\"" << p->symbol_name << "\","; |
dd225250 PS |
8618 | s.op->line() << " },"; |
8619 | } | |
dac77b80 | 8620 | s.op->newline(-1) << "};"; |
dd225250 PS |
8621 | |
8622 | // Emit the hwbkpt callback function | |
8623 | s.op->newline() ; | |
8624 | s.op->newline() << "static int enter_hwbkpt_probe (struct perf_event *bp,"; | |
8625 | s.op->line() << " int nmi,"; | |
8626 | s.op->line() << " struct perf_sample_data *data,"; | |
8627 | s.op->line() << " struct pt_regs *regs) {"; | |
dac77b80 FCE |
8628 | s.op->newline(1) << "unsigned int i;"; |
8629 | s.op->newline() << "if (bp->attr.type != PERF_TYPE_BREAKPOINT) return -1;"; | |
8630 | s.op->newline() << "for (i=0; i<" << hwbkpt_probes.size() << "; i++) {"; | |
8631 | s.op->newline(1) << "struct perf_event_attr *hp = & stap_hwbkpt_probe_array[i];"; | |
8632 | // XXX: why not match stap_hwbkpt_ret_array[i] against bp instead? | |
8633 | 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) {"; | |
8634 | s.op->newline(1) << "struct stap_hwbkpt_probe *sdp = &stap_hwbkpt_probes[i];"; | |
6eefe942 MW |
8635 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->probe", |
8636 | "_STP_PROBE_HANDLER_HWBKPT"); | |
d9aed31e MW |
8637 | s.op->newline() << "if (user_mode(regs)) {"; |
8638 | s.op->newline(1)<< "c->probe_flags |= _STP_PROBE_STATE_USER_MODE;"; | |
8639 | s.op->newline() << "c->uregs = regs;"; | |
8640 | s.op->newline(-1) << "} else {"; | |
8641 | s.op->newline(1) << "c->kregs = regs;"; | |
8642 | s.op->newline(-1) << "}"; | |
26e63673 | 8643 | s.op->newline() << "(*sdp->probe->ph) (c);"; |
7baf48e9 | 8644 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
dac77b80 | 8645 | s.op->newline(-1) << "}"; |
dd225250 PS |
8646 | s.op->newline(-1) << "}"; |
8647 | s.op->newline() << "return 0;"; | |
dac77b80 | 8648 | s.op->newline(-1) << "}"; |
dd225250 PS |
8649 | } |
8650 | ||
8651 | void | |
8652 | hwbkpt_derived_probe_group::emit_module_init (systemtap_session& s) | |
8653 | { | |
dac77b80 | 8654 | s.op->newline() << "for (i=0; i<" << hwbkpt_probes.size() << "; i++) {"; |
dd225250 PS |
8655 | s.op->newline(1) << "struct stap_hwbkpt_probe *sdp = & stap_hwbkpt_probes[i];"; |
8656 | s.op->newline() << "struct perf_event_attr *hp = & stap_hwbkpt_probe_array[i];"; | |
8657 | s.op->newline() << "void *addr = (void *) sdp->address;"; | |
8658 | s.op->newline() << "const char *hwbkpt_symbol_name = addr ? NULL : sdp->symbol;"; | |
dac77b80 FCE |
8659 | s.op->newline() << "hw_breakpoint_init(hp);"; |
8660 | s.op->newline() << "if (addr)"; | |
8661 | s.op->newline(1) << "hp->bp_addr = (unsigned long) addr;"; | |
8662 | s.op->newline(-1) << "else { "; | |
8663 | s.op->newline(1) << "hp->bp_addr = kallsyms_lookup_name(hwbkpt_symbol_name);"; | |
8664 | s.op->newline() << "if (!hp->bp_addr) { "; | |
26e63673 | 8665 | s.op->newline(1) << "_stp_warn(\"Probe %s registration skipped: invalid symbol %s \",sdp->probe->pp,hwbkpt_symbol_name);"; |
dac77b80 FCE |
8666 | s.op->newline() << "continue;"; |
8667 | s.op->newline(-1) << "}"; | |
8668 | s.op->newline(-1) << "}"; | |
8669 | s.op->newline() << "hp->bp_type = sdp->atype;"; | |
8670 | ||
8671 | // On x86 & x86-64, hp->bp_len is not just a number but a macro/enum (!?!). | |
c57ea854 | 8672 | if (s.architecture == "i386" || s.architecture == "x86_64" ) |
dac77b80 FCE |
8673 | { |
8674 | s.op->newline() << "switch(sdp->len) {"; | |
8675 | s.op->newline() << "case 1:"; | |
8676 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_1;"; | |
8677 | s.op->newline() << "break;"; | |
8678 | s.op->newline(-1) << "case 2:"; | |
8679 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_2;"; | |
8680 | s.op->newline() << "break;"; | |
8681 | s.op->newline(-1) << "case 3:"; | |
8682 | s.op->newline() << "case 4:"; | |
8683 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_4;"; | |
8684 | s.op->newline() << "break;"; | |
8685 | s.op->newline(-1) << "case 5:"; | |
8686 | s.op->newline() << "case 6:"; | |
8687 | s.op->newline() << "case 7:"; | |
8688 | s.op->newline() << "case 8:"; | |
8689 | s.op->newline() << "default:"; // XXX: could instead reject | |
8690 | s.op->newline(1) << "hp->bp_len = HW_BREAKPOINT_LEN_8;"; | |
8691 | s.op->newline() << "break;"; | |
8692 | s.op->newline(-1) << "}"; | |
8693 | } | |
8694 | else // other architectures presumed straightforward | |
8695 | s.op->newline() << "hp->bp_len = sdp->len;"; | |
8696 | ||
26e63673 | 8697 | s.op->newline() << "probe_point = sdp->probe->pp;"; // for error messages |
b273669e MW |
8698 | s.op->newline() << "#ifdef STAPCONF_HW_BREAKPOINT_CONTEXT"; |
8699 | s.op->newline() << "stap_hwbkpt_ret_array[i] = register_wide_hw_breakpoint(hp, (void *)&enter_hwbkpt_probe, NULL);"; | |
8700 | s.op->newline() << "#else"; | |
dac77b80 | 8701 | s.op->newline() << "stap_hwbkpt_ret_array[i] = register_wide_hw_breakpoint(hp, (void *)&enter_hwbkpt_probe);"; |
b273669e | 8702 | s.op->newline() << "#endif"; |
43650b10 | 8703 | s.op->newline() << "rc = 0;"; |
dac77b80 | 8704 | s.op->newline() << "if (IS_ERR(stap_hwbkpt_ret_array[i])) {"; |
43650b10 WC |
8705 | s.op->newline(1) << "rc = PTR_ERR(stap_hwbkpt_ret_array[i]);"; |
8706 | s.op->newline() << "stap_hwbkpt_ret_array[i] = 0;"; | |
8707 | s.op->newline(-1) << "}"; | |
217ef1f4 WC |
8708 | s.op->newline() << "if (rc) {"; |
8709 | s.op->newline(1) << "_stp_warn(\"Hwbkpt probe %s: registration error %d, addr %p, name %s\", probe_point, rc, addr, hwbkpt_symbol_name);"; | |
43650b10 | 8710 | s.op->newline() << "sdp->registered_p = 0;"; |
dac77b80 | 8711 | s.op->newline(-1) << "}"; |
dd225250 | 8712 | s.op->newline() << " else sdp->registered_p = 1;"; |
dd225250 PS |
8713 | s.op->newline(-1) << "}"; // for loop |
8714 | } | |
8715 | ||
8716 | void | |
8717 | hwbkpt_derived_probe_group::emit_module_exit (systemtap_session& s) | |
8718 | { | |
8719 | //Unregister hwbkpt probes. | |
dac77b80 | 8720 | s.op->newline() << "for (i=0; i<" << hwbkpt_probes.size() << "; i++) {"; |
dd225250 | 8721 | s.op->newline(1) << "struct stap_hwbkpt_probe *sdp = & stap_hwbkpt_probes[i];"; |
dac77b80 FCE |
8722 | s.op->newline() << "if (sdp->registered_p == 0) continue;"; |
8723 | s.op->newline() << "unregister_wide_hw_breakpoint(stap_hwbkpt_ret_array[i]);"; | |
dd225250 PS |
8724 | s.op->newline() << "sdp->registered_p = 0;"; |
8725 | s.op->newline(-1) << "}"; | |
8726 | } | |
8727 | ||
8728 | struct hwbkpt_builder: public derived_probe_builder | |
8729 | { | |
8730 | hwbkpt_builder() {} | |
8731 | virtual void build(systemtap_session & sess, | |
8732 | probe * base, | |
8733 | probe_point * location, | |
8734 | literal_map_t const & parameters, | |
8735 | vector<derived_probe *> & finished_results); | |
8736 | }; | |
8737 | ||
8738 | void | |
8739 | hwbkpt_builder::build(systemtap_session & sess, | |
8740 | probe * base, | |
8741 | probe_point * location, | |
8742 | literal_map_t const & parameters, | |
8743 | vector<derived_probe *> & finished_results) | |
8744 | { | |
8745 | string symbol_str_val; | |
8746 | int64_t hwbkpt_address, len; | |
8747 | bool has_addr, has_symbol_str, has_write, has_rw, has_len; | |
8748 | ||
b47f3a55 | 8749 | if (! (sess.kernel_config["CONFIG_PERF_EVENTS"] == string("y"))) |
b530b5b3 | 8750 | throw semantic_error (_("CONFIG_PERF_EVENTS not available on this kernel"), |
b47f3a55 FCE |
8751 | location->components[0]->tok); |
8752 | if (! (sess.kernel_config["CONFIG_HAVE_HW_BREAKPOINT"] == string("y"))) | |
b530b5b3 | 8753 | throw semantic_error (_("CONFIG_HAVE_HW_BREAKPOINT not available on this kernel"), |
b47f3a55 FCE |
8754 | location->components[0]->tok); |
8755 | ||
dd225250 PS |
8756 | has_addr = get_param (parameters, TOK_HWBKPT, hwbkpt_address); |
8757 | has_symbol_str = get_param (parameters, TOK_HWBKPT, symbol_str_val); | |
8758 | has_len = get_param (parameters, TOK_LENGTH, len); | |
8759 | has_write = (parameters.find(TOK_HWBKPT_WRITE) != parameters.end()); | |
8760 | has_rw = (parameters.find(TOK_HWBKPT_RW) != parameters.end()); | |
8761 | ||
8762 | if (!has_len) | |
8763 | len = 1; | |
8764 | ||
8765 | if (has_addr) | |
8766 | finished_results.push_back (new hwbkpt_derived_probe (base, | |
8767 | location, | |
8768 | hwbkpt_address, | |
8769 | "",len,0, | |
8770 | has_write, | |
8771 | has_rw)); | |
5d8a0aea | 8772 | else if (has_symbol_str) |
dd225250 PS |
8773 | finished_results.push_back (new hwbkpt_derived_probe (base, |
8774 | location, | |
8775 | 0, | |
8776 | symbol_str_val,len,0, | |
8777 | has_write, | |
8778 | has_rw)); | |
5d8a0aea FCE |
8779 | else |
8780 | assert (0); | |
dd225250 | 8781 | } |
342d3f96 | 8782 | |
0a6f5a3f JS |
8783 | // ------------------------------------------------------------------------ |
8784 | // statically inserted kernel-tracepoint derived probes | |
8785 | // ------------------------------------------------------------------------ | |
8786 | ||
6fb70fb7 | 8787 | struct tracepoint_arg |
79189b84 | 8788 | { |
ad370dcc | 8789 | string name, c_type, typecast; |
dcaa1a65 | 8790 | bool usable, used, isptr; |
f8a968bc | 8791 | Dwarf_Die type_die; |
dcaa1a65 | 8792 | tracepoint_arg(): usable(false), used(false), isptr(false) {} |
6fb70fb7 | 8793 | }; |
79189b84 | 8794 | |
0a6f5a3f JS |
8795 | struct tracepoint_derived_probe: public derived_probe |
8796 | { | |
79189b84 JS |
8797 | tracepoint_derived_probe (systemtap_session& s, |
8798 | dwflpp& dw, Dwarf_Die& func_die, | |
8799 | const string& tracepoint_name, | |
8800 | probe* base_probe, probe_point* location); | |
bc9a523d | 8801 | |
79189b84 | 8802 | systemtap_session& sess; |
6fb70fb7 JS |
8803 | string tracepoint_name, header; |
8804 | vector <struct tracepoint_arg> args; | |
bc9a523d | 8805 | |
6fb70fb7 | 8806 | void build_args(dwflpp& dw, Dwarf_Die& func_die); |
d0bfd2ac | 8807 | void getargs (std::list<std::string> &arg_set) const; |
79189b84 | 8808 | void join_group (systemtap_session& s); |
3e3bd7b6 | 8809 | void print_dupe_stamp(ostream& o); |
0a6f5a3f | 8810 | }; |
79189b84 JS |
8811 | |
8812 | ||
0a6f5a3f | 8813 | struct tracepoint_derived_probe_group: public generic_dpg<tracepoint_derived_probe> |
79189b84 | 8814 | { |
79189b84 JS |
8815 | void emit_module_decls (systemtap_session& s); |
8816 | void emit_module_init (systemtap_session& s); | |
8817 | void emit_module_exit (systemtap_session& s); | |
0a6f5a3f | 8818 | }; |
79189b84 | 8819 | |
bc9a523d | 8820 | |
f8a968bc JS |
8821 | struct tracepoint_var_expanding_visitor: public var_expanding_visitor |
8822 | { | |
8823 | tracepoint_var_expanding_visitor(dwflpp& dw, const string& probe_name, | |
8824 | vector <struct tracepoint_arg>& args): | |
8825 | dw (dw), probe_name (probe_name), args (args) {} | |
8826 | dwflpp& dw; | |
8827 | const string& probe_name; | |
8828 | vector <struct tracepoint_arg>& args; | |
bc9a523d | 8829 | |
f8a968bc JS |
8830 | void visit_target_symbol (target_symbol* e); |
8831 | void visit_target_symbol_arg (target_symbol* e); | |
8832 | void visit_target_symbol_context (target_symbol* e); | |
8833 | }; | |
79189b84 JS |
8834 | |
8835 | ||
f8a968bc JS |
8836 | void |
8837 | tracepoint_var_expanding_visitor::visit_target_symbol_arg (target_symbol* e) | |
75ead1f7 | 8838 | { |
cc9001af | 8839 | string argname = e->sym_name(); |
75ead1f7 | 8840 | |
f8a968bc JS |
8841 | // search for a tracepoint parameter matching this name |
8842 | tracepoint_arg *arg = NULL; | |
8843 | for (unsigned i = 0; i < args.size(); ++i) | |
dcaa1a65 | 8844 | if (args[i].usable && args[i].name == argname) |
f8a968bc JS |
8845 | { |
8846 | arg = &args[i]; | |
8847 | arg->used = true; | |
8848 | break; | |
8849 | } | |
75ead1f7 | 8850 | |
f8a968bc JS |
8851 | if (arg == NULL) |
8852 | { | |
8853 | stringstream alternatives; | |
8854 | for (unsigned i = 0; i < args.size(); ++i) | |
8855 | alternatives << " $" << args[i].name; | |
046e7190 | 8856 | alternatives << " $$name $$parms $$vars"; |
75ead1f7 | 8857 | |
f8a968bc JS |
8858 | // We hope that this value ends up not being referenced after all, so it |
8859 | // can be optimized out quietly. | |
b530b5b3 LB |
8860 | throw semantic_error(_F("unable to find tracepoint variable '%s' (alternatives: %s)", |
8861 | e->name.c_str(), alternatives.str().c_str()), e->tok); | |
f8a968bc JS |
8862 | // NB: we can have multiple errors, since a target variable |
8863 | // may be expanded in several different contexts: | |
8864 | // trace ("*") { $foo->bar } | |
f8a968bc | 8865 | } |
75ead1f7 | 8866 | |
f8a968bc | 8867 | // make sure we're not dereferencing base types |
dc5a09fc | 8868 | if (!arg->isptr) |
d19a9a82 | 8869 | e->assert_no_components("tracepoint", true); |
75ead1f7 | 8870 | |
f8a968bc JS |
8871 | // we can only write to dereferenced fields, and only if guru mode is on |
8872 | bool lvalue = is_active_lvalue(e); | |
8873 | if (lvalue && (!dw.sess.guru_mode || e->components.empty())) | |
b3741c9d | 8874 | throw semantic_error(_F("write to tracepoint variable '%s' not permitted; need stap -g", e->name.c_str()), e->tok); |
c69a87e0 | 8875 | |
ad370dcc JS |
8876 | // XXX: if a struct/union arg is passed by value, then writing to its fields |
8877 | // is also meaningless until you dereference past a pointer member. It's | |
8878 | // harder to detect and prevent that though... | |
75ead1f7 | 8879 | |
f8a968bc JS |
8880 | if (e->components.empty()) |
8881 | { | |
03c75a4a | 8882 | if (e->addressof) |
b530b5b3 | 8883 | throw semantic_error(_("cannot take address of tracepoint variable"), e->tok); |
a45664f4 | 8884 | |
3e3bd7b6 | 8885 | // Just grab the value from the probe locals |
a45664f4 JS |
8886 | symbol* sym = new symbol; |
8887 | sym->tok = e->tok; | |
8888 | sym->name = "__tracepoint_arg_" + arg->name; | |
8889 | provide (sym); | |
f8a968bc JS |
8890 | } |
8891 | else | |
8892 | { | |
5f36109e JS |
8893 | // make a copy of the original as a bare target symbol for the tracepoint |
8894 | // value, which will be passed into the dwarf dereferencing code | |
8895 | target_symbol* e2 = deep_copy_visitor::deep_copy(e); | |
8896 | e2->components.clear(); | |
8897 | ||
8898 | if (e->components.back().type == target_symbol::comp_pretty_print) | |
8899 | { | |
8900 | if (lvalue) | |
b530b5b3 | 8901 | throw semantic_error(_("cannot write to pretty-printed variable"), e->tok); |
5f36109e | 8902 | |
d19a9a82 | 8903 | dwarf_pretty_print dpp(dw, &arg->type_die, e2, arg->isptr, false, *e); |
5f36109e JS |
8904 | dpp.expand()->visit (this); |
8905 | return; | |
8906 | } | |
8907 | ||
f8a968bc JS |
8908 | // Synthesize a function to dereference the dwarf fields, |
8909 | // with a pointer parameter that is the base tracepoint variable | |
8910 | functiondecl *fdecl = new functiondecl; | |
59de45f1 | 8911 | fdecl->synthetic = true; |
f8a968bc JS |
8912 | fdecl->tok = e->tok; |
8913 | embeddedcode *ec = new embeddedcode; | |
8914 | ec->tok = e->tok; | |
75ead1f7 | 8915 | |
f8a968bc | 8916 | string fname = (string(lvalue ? "_tracepoint_tvar_set" : "_tracepoint_tvar_get") |
cc9001af | 8917 | + "_" + e->sym_name() |
aca66a36 | 8918 | + "_" + lex_cast(tick++)); |
75ead1f7 | 8919 | |
f8a968bc JS |
8920 | fdecl->name = fname; |
8921 | fdecl->body = ec; | |
75ead1f7 | 8922 | |
a5ce5211 | 8923 | ec->code += EMBEDDED_FETCH_DEREF(false); |
c69a87e0 | 8924 | ec->code += dw.literal_stmt_for_pointer (&arg->type_die, e, |
f8a968bc | 8925 | lvalue, fdecl->type); |
75ead1f7 | 8926 | |
f8a968bc JS |
8927 | // Give the fdecl an argument for the raw tracepoint value |
8928 | vardecl *v1 = new vardecl; | |
8929 | v1->type = pe_long; | |
8930 | v1->name = "pointer"; | |
8931 | v1->tok = e->tok; | |
8932 | fdecl->formal_args.push_back(v1); | |
75ead1f7 | 8933 | |
6fda2dff JS |
8934 | // Any non-literal indexes need to be passed in too. |
8935 | for (unsigned i = 0; i < e->components.size(); ++i) | |
8936 | if (e->components[i].type == target_symbol::comp_expression_array_index) | |
8937 | { | |
8938 | vardecl *v = new vardecl; | |
8939 | v->type = pe_long; | |
aca66a36 | 8940 | v->name = "index" + lex_cast(i); |
6fda2dff JS |
8941 | v->tok = e->tok; |
8942 | fdecl->formal_args.push_back(v); | |
8943 | } | |
8944 | ||
f8a968bc JS |
8945 | if (lvalue) |
8946 | { | |
8947 | // Modify the fdecl so it carries a pe_long formal | |
8948 | // argument called "value". | |
75ead1f7 | 8949 | |
f8a968bc JS |
8950 | // FIXME: For the time being we only support setting target |
8951 | // variables which have base types; these are 'pe_long' in | |
8952 | // stap's type vocabulary. Strings and pointers might be | |
8953 | // reasonable, some day, but not today. | |
8954 | ||
8955 | vardecl *v2 = new vardecl; | |
8956 | v2->type = pe_long; | |
8957 | v2->name = "value"; | |
8958 | v2->tok = e->tok; | |
8959 | fdecl->formal_args.push_back(v2); | |
8960 | } | |
8961 | else | |
8962 | ec->code += "/* pure */"; | |
8963 | ||
64211010 | 8964 | ec->code += "/* unprivileged */"; |
a5ce5211 | 8965 | ec->code += EMBEDDED_FETCH_DEREF_DONE; |
aff5d390 | 8966 | |
f8809d54 | 8967 | fdecl->join (dw.sess); |
75ead1f7 | 8968 | |
f8a968bc JS |
8969 | // Synthesize a functioncall. |
8970 | functioncall* n = new functioncall; | |
8971 | n->tok = e->tok; | |
8972 | n->function = fname; | |
6fda2dff JS |
8973 | n->args.push_back(require(e2)); |
8974 | ||
8975 | // Any non-literal indexes need to be passed in too. | |
8976 | for (unsigned i = 0; i < e->components.size(); ++i) | |
8977 | if (e->components[i].type == target_symbol::comp_expression_array_index) | |
8978 | n->args.push_back(require(e->components[i].expr_index)); | |
75ead1f7 | 8979 | |
f8a968bc JS |
8980 | if (lvalue) |
8981 | { | |
8982 | // Provide the functioncall to our parent, so that it can be | |
8983 | // used to substitute for the assignment node immediately above | |
8984 | // us. | |
8985 | assert(!target_symbol_setter_functioncalls.empty()); | |
8986 | *(target_symbol_setter_functioncalls.top()) = n; | |
8987 | } | |
75ead1f7 | 8988 | |
f8a968bc JS |
8989 | provide (n); |
8990 | } | |
75ead1f7 JS |
8991 | } |
8992 | ||
8993 | ||
f8a968bc JS |
8994 | void |
8995 | tracepoint_var_expanding_visitor::visit_target_symbol_context (target_symbol* e) | |
0a6f5a3f | 8996 | { |
03c75a4a | 8997 | if (e->addressof) |
b530b5b3 | 8998 | throw semantic_error(_("cannot take address of context variable"), e->tok); |
03c75a4a | 8999 | |
f8a968bc | 9000 | if (is_active_lvalue (e)) |
b530b5b3 | 9001 | throw semantic_error(_F("write to tracepoint '%s' not permitted", e->name.c_str()), e->tok); |
0a6f5a3f | 9002 | |
277c21bc | 9003 | if (e->name == "$$name") |
f8a968bc | 9004 | { |
5f36109e JS |
9005 | e->assert_no_components("tracepoint"); |
9006 | ||
bfdaad1e DS |
9007 | // Synthesize an embedded expression. |
9008 | embedded_expr *expr = new embedded_expr; | |
9009 | expr->tok = e->tok; | |
9010 | expr->code = string("/* string */ /* pure */ ") | |
6dceb5c9 | 9011 | + string("c->ips.tracepoint_name ? c->ips.tracepoint_name : \"\""); |
bfdaad1e | 9012 | provide (expr); |
f8a968bc | 9013 | } |
277c21bc | 9014 | else if (e->name == "$$vars" || e->name == "$$parms") |
f8a968bc | 9015 | { |
5f36109e JS |
9016 | e->assert_no_components("tracepoint", true); |
9017 | ||
f8a968bc JS |
9018 | token* pf_tok = new token(*e->tok); |
9019 | pf_tok->content = "sprintf"; | |
0a6f5a3f | 9020 | |
d5e178c1 | 9021 | print_format* pf = print_format::create(pf_tok); |
0a6f5a3f | 9022 | |
f8a968bc | 9023 | for (unsigned i = 0; i < args.size(); ++i) |
b278033a | 9024 | { |
dcaa1a65 JS |
9025 | if (!args[i].usable) |
9026 | continue; | |
f8a968bc JS |
9027 | if (i > 0) |
9028 | pf->raw_components += " "; | |
9029 | pf->raw_components += args[i].name; | |
3e3bd7b6 | 9030 | target_symbol *tsym = new target_symbol; |
f8a968bc | 9031 | tsym->tok = e->tok; |
277c21bc | 9032 | tsym->name = "$" + args[i].name; |
5f36109e | 9033 | tsym->components = e->components; |
b278033a | 9034 | |
f8a968bc JS |
9035 | // every variable should always be accessible! |
9036 | tsym->saved_conversion_error = 0; | |
9037 | expression *texp = require (tsym); // NB: throws nothing ... | |
14a97852 JS |
9038 | if (tsym->saved_conversion_error) // ... but this is how we know it happened. |
9039 | { | |
9040 | if (dw.sess.verbose>2) | |
e26c2f83 | 9041 | for (const semantic_error *c = tsym->saved_conversion_error; |
14a97852 | 9042 | c != 0; c = c->chain) |
b530b5b3 | 9043 | clog << _("variable location problem: ") << c->what() << endl; |
14a97852 JS |
9044 | pf->raw_components += "=?"; |
9045 | continue; | |
9046 | } | |
b278033a | 9047 | |
5f36109e JS |
9048 | if (!e->components.empty() && |
9049 | e->components[0].type == target_symbol::comp_pretty_print) | |
9050 | pf->raw_components += "=%s"; | |
9051 | else | |
9052 | pf->raw_components += args[i].isptr ? "=%p" : "=%#x"; | |
f8a968bc JS |
9053 | pf->args.push_back(texp); |
9054 | } | |
0a6f5a3f | 9055 | |
f8a968bc JS |
9056 | pf->components = print_format::string_to_components(pf->raw_components); |
9057 | provide (pf); | |
b278033a | 9058 | } |
f8a968bc JS |
9059 | else |
9060 | assert(0); // shouldn't get here | |
0a6f5a3f JS |
9061 | } |
9062 | ||
0a6f5a3f | 9063 | void |
f8a968bc | 9064 | tracepoint_var_expanding_visitor::visit_target_symbol (target_symbol* e) |
0a6f5a3f | 9065 | { |
aff5d390 | 9066 | try |
c69a87e0 | 9067 | { |
8fa5f271 MW |
9068 | assert(e->name.size() > 0 |
9069 | && ((e->name[0] == '$' && e->target_name == "") | |
9070 | || (e->name == "@var" && e->target_name != ""))); | |
aff5d390 | 9071 | |
277c21bc | 9072 | if (e->name == "$$name" || e->name == "$$parms" || e->name == "$$vars") |
c69a87e0 | 9073 | visit_target_symbol_context (e); |
8fa5f271 MW |
9074 | else if (e->name == "@var") |
9075 | throw semantic_error(_("cannot use @var DWARF variables in tracepoints"), e->tok); | |
c69a87e0 FCE |
9076 | else |
9077 | visit_target_symbol_arg (e); | |
9078 | } | |
9079 | catch (const semantic_error &er) | |
9080 | { | |
1af1e62d | 9081 | e->chain (er); |
c69a87e0 FCE |
9082 | provide (e); |
9083 | } | |
0a6f5a3f JS |
9084 | } |
9085 | ||
9086 | ||
9087 | ||
79189b84 JS |
9088 | tracepoint_derived_probe::tracepoint_derived_probe (systemtap_session& s, |
9089 | dwflpp& dw, Dwarf_Die& func_die, | |
9090 | const string& tracepoint_name, | |
9091 | probe* base, probe_point* loc): | |
4c5d1300 | 9092 | derived_probe (base, loc, true /* .components soon rewritten */), |
79189b84 | 9093 | sess (s), tracepoint_name (tracepoint_name) |
56894e91 | 9094 | { |
79189b84 JS |
9095 | // create synthetic probe point name; preserve condition |
9096 | vector<probe_point::component*> comps; | |
9097 | comps.push_back (new probe_point::component (TOK_KERNEL)); | |
9098 | comps.push_back (new probe_point::component (TOK_TRACE, new literal_string (tracepoint_name))); | |
9099 | this->sole_location()->components = comps; | |
9100 | ||
6fb70fb7 JS |
9101 | // fill out the available arguments in this tracepoint |
9102 | build_args(dw, func_die); | |
56894e91 | 9103 | |
6fb70fb7 JS |
9104 | // determine which header defined this tracepoint |
9105 | string decl_file = dwarf_decl_file(&func_die); | |
d4393459 FCE |
9106 | header = decl_file; |
9107 | ||
9108 | #if 0 /* This convention is not enforced. */ | |
6fb70fb7 JS |
9109 | size_t header_pos = decl_file.rfind("trace/"); |
9110 | if (header_pos == string::npos) | |
9111 | throw semantic_error ("cannot parse header location for tracepoint '" | |
9112 | + tracepoint_name + "' in '" | |
9113 | + decl_file + "'"); | |
9114 | header = decl_file.substr(header_pos); | |
d4393459 | 9115 | #endif |
56894e91 | 9116 | |
6fb70fb7 JS |
9117 | // tracepoints from FOO_event_types.h should really be included from FOO.h |
9118 | // XXX can dwarf tell us the include hierarchy? it would be better to | |
9119 | // ... walk up to see which one was directly included by tracequery.c | |
3c1b3d06 | 9120 | // XXX: see also PR9993. |
d4393459 | 9121 | size_t header_pos = header.find("_event_types"); |
6fb70fb7 JS |
9122 | if (header_pos != string::npos) |
9123 | header.erase(header_pos, 12); | |
56894e91 | 9124 | |
f8a968bc JS |
9125 | // Now expand the local variables in the probe body |
9126 | tracepoint_var_expanding_visitor v (dw, name, args); | |
8b095b45 | 9127 | v.replace (this->body); |
a45664f4 JS |
9128 | for (unsigned i = 0; i < args.size(); i++) |
9129 | if (args[i].used) | |
9130 | { | |
9131 | vardecl* v = new vardecl; | |
9132 | v->name = "__tracepoint_arg_" + args[i].name; | |
9133 | v->tok = this->tok; | |
58701b78 | 9134 | v->set_arity(0, this->tok); |
a45664f4 JS |
9135 | v->type = pe_long; |
9136 | v->skip_init = true; | |
9137 | this->locals.push_back (v); | |
9138 | } | |
56894e91 | 9139 | |
79189b84 | 9140 | if (sess.verbose > 2) |
ce0f6648 | 9141 | clog << "tracepoint-based " << name << " tracepoint='" << tracepoint_name << "'" << endl; |
79189b84 | 9142 | } |
dc38c0ae | 9143 | |
56894e91 | 9144 | |
f8a968bc | 9145 | static bool |
dcaa1a65 | 9146 | resolve_tracepoint_arg_type(tracepoint_arg& arg) |
46b84a80 | 9147 | { |
d19a9a82 | 9148 | Dwarf_Die type; |
dcaa1a65 | 9149 | switch (dwarf_tag(&arg.type_die)) |
b20febf3 | 9150 | { |
f8a968bc JS |
9151 | case DW_TAG_typedef: |
9152 | case DW_TAG_const_type: | |
9153 | case DW_TAG_volatile_type: | |
9154 | // iterate on the referent type | |
3d1ad340 | 9155 | return (dwarf_attr_die(&arg.type_die, DW_AT_type, &arg.type_die) |
dcaa1a65 | 9156 | && resolve_tracepoint_arg_type(arg)); |
f8a968bc | 9157 | case DW_TAG_base_type: |
a52d2ac0 | 9158 | case DW_TAG_enumeration_type: |
f8a968bc | 9159 | // base types will simply be treated as script longs |
dcaa1a65 | 9160 | arg.isptr = false; |
f8a968bc JS |
9161 | return true; |
9162 | case DW_TAG_pointer_type: | |
dcaa1a65 JS |
9163 | // pointers can be treated as script longs, |
9164 | // and if we know their type, they can also be dereferenced | |
d19a9a82 JS |
9165 | type = arg.type_die; |
9166 | while (dwarf_attr_die(&arg.type_die, DW_AT_type, &arg.type_die)) | |
9167 | { | |
9168 | // It still might be a non-type, e.g. const void, | |
9169 | // so we need to strip away all qualifiers. | |
9170 | int tag = dwarf_tag(&arg.type_die); | |
9171 | if (tag != DW_TAG_typedef && | |
9172 | tag != DW_TAG_const_type && | |
9173 | tag != DW_TAG_volatile_type) | |
9174 | { | |
9175 | arg.isptr = true; | |
9176 | break; | |
9177 | } | |
9178 | } | |
9179 | if (!arg.isptr) | |
9180 | arg.type_die = type; | |
ad370dcc JS |
9181 | arg.typecast = "(intptr_t)"; |
9182 | return true; | |
9183 | case DW_TAG_structure_type: | |
9184 | case DW_TAG_union_type: | |
9185 | // for structs/unions which are passed by value, we turn it into | |
9186 | // a pointer that can be dereferenced. | |
9187 | arg.isptr = true; | |
9188 | arg.typecast = "(intptr_t)&"; | |
dcaa1a65 | 9189 | return true; |
f8a968bc JS |
9190 | default: |
9191 | // should we consider other types too? | |
9192 | return false; | |
b20febf3 | 9193 | } |
56894e91 JS |
9194 | } |
9195 | ||
9196 | ||
9197 | void | |
822a6a3d | 9198 | tracepoint_derived_probe::build_args(dwflpp&, Dwarf_Die& func_die) |
56894e91 | 9199 | { |
6fb70fb7 JS |
9200 | Dwarf_Die arg; |
9201 | if (dwarf_child(&func_die, &arg) == 0) | |
9202 | do | |
9203 | if (dwarf_tag(&arg) == DW_TAG_formal_parameter) | |
9204 | { | |
9205 | // build a tracepoint_arg for this parameter | |
9206 | tracepoint_arg tparg; | |
23d106b9 | 9207 | tparg.name = dwarf_diename(&arg); |
56894e91 | 9208 | |
6fb70fb7 | 9209 | // read the type of this parameter |
3d1ad340 | 9210 | if (!dwarf_attr_die (&arg, DW_AT_type, &tparg.type_die) |
f1c8f8a5 | 9211 | || !dwarf_type_name(&tparg.type_die, tparg.c_type)) |
ce0f6648 LB |
9212 | throw semantic_error (_F("cannot get type of parameter '%s' of tracepoint '%s'", |
9213 | tparg.name.c_str(), tracepoint_name.c_str())); | |
a68f81a2 | 9214 | |
dcaa1a65 | 9215 | tparg.usable = resolve_tracepoint_arg_type(tparg); |
6fb70fb7 JS |
9216 | args.push_back(tparg); |
9217 | if (sess.verbose > 4) | |
a52d2ac0 JS |
9218 | clog << _F("found parameter for tracepoint '%s': type:'%s' name:'%s' %s", |
9219 | tracepoint_name.c_str(), tparg.c_type.c_str(), tparg.name.c_str(), | |
9220 | tparg.usable ? "ok" : "unavailable") << endl; | |
6fb70fb7 JS |
9221 | } |
9222 | while (dwarf_siblingof(&arg, &arg) == 0); | |
56894e91 JS |
9223 | } |
9224 | ||
dc38c0ae | 9225 | void |
d0bfd2ac | 9226 | tracepoint_derived_probe::getargs(std::list<std::string> &arg_set) const |
dc38c0ae | 9227 | { |
dcaa1a65 JS |
9228 | for (unsigned i = 0; i < args.size(); ++i) |
9229 | if (args[i].usable) | |
d0bfd2ac | 9230 | arg_set.push_back("$"+args[i].name+":"+args[i].c_type); |
dc38c0ae DS |
9231 | } |
9232 | ||
79189b84 JS |
9233 | void |
9234 | tracepoint_derived_probe::join_group (systemtap_session& s) | |
197a4d62 | 9235 | { |
79189b84 JS |
9236 | if (! s.tracepoint_derived_probes) |
9237 | s.tracepoint_derived_probes = new tracepoint_derived_probe_group (); | |
9238 | s.tracepoint_derived_probes->enroll (this); | |
9239 | } | |
e38d6504 | 9240 | |
56894e91 | 9241 | |
197a4d62 | 9242 | void |
3e3bd7b6 | 9243 | tracepoint_derived_probe::print_dupe_stamp(ostream& o) |
56894e91 | 9244 | { |
3e3bd7b6 JS |
9245 | for (unsigned i = 0; i < args.size(); i++) |
9246 | if (args[i].used) | |
9247 | o << "__tracepoint_arg_" << args[i].name << endl; | |
197a4d62 | 9248 | } |
56894e91 | 9249 | |
3e3bd7b6 | 9250 | |
c9ccb642 | 9251 | static vector<string> tracepoint_extra_decls (systemtap_session& s, const string& header) |
47dd066d | 9252 | { |
3c1b3d06 FCE |
9253 | vector<string> they_live; |
9254 | // PR 9993 | |
9255 | // XXX: may need this to be configurable | |
d4393459 | 9256 | they_live.push_back ("#include <linux/skbuff.h>"); |
9e0cd21a FCE |
9257 | |
9258 | // PR11649: conditional extra header | |
9259 | // for kvm tracepoints in 2.6.33ish | |
9260 | if (s.kernel_config["CONFIG_KVM"] != string("")) { | |
d4393459 FCE |
9261 | they_live.push_back ("#include <linux/kvm_host.h>"); |
9262 | } | |
9263 | ||
50b72692 | 9264 | if (header.find("xfs") != string::npos && s.kernel_config["CONFIG_XFS_FS"] != string("")) { |
d4393459 | 9265 | they_live.push_back ("#define XFS_BIG_BLKNOS 1"); |
88637c31 FCE |
9266 | if (s.kernel_source_tree != "") |
9267 | they_live.push_back ("#include \"fs/xfs/xfs_types.h\""); // in kernel-source tree | |
d4393459 FCE |
9268 | they_live.push_back ("struct xfs_mount;"); |
9269 | they_live.push_back ("struct xfs_inode;"); | |
9270 | they_live.push_back ("struct xfs_buf;"); | |
9271 | they_live.push_back ("struct xfs_bmbt_irec;"); | |
c2cf1b87 | 9272 | they_live.push_back ("struct xfs_trans;"); |
9e0cd21a | 9273 | } |
d4393459 | 9274 | |
50b72692 | 9275 | if (header.find("nfs") != string::npos && s.kernel_config["CONFIG_NFSD"] != string("")) { |
d4393459 FCE |
9276 | they_live.push_back ("struct rpc_task;"); |
9277 | } | |
9278 | ||
9279 | they_live.push_back ("#include <asm/cputime.h>"); | |
9280 | ||
c2cf1b87 FCE |
9281 | // linux 3.0 |
9282 | they_live.push_back ("struct cpu_workqueue_struct;"); | |
9283 | ||
50b72692 | 9284 | if (header.find("ext4") != string::npos && s.kernel_config["CONFIG_EXT4_FS"] != string("")) |
c2cf1b87 FCE |
9285 | if (s.kernel_source_tree != "") |
9286 | they_live.push_back ("#include \"fs/ext4/ext4.h\""); // in kernel-source tree | |
9287 | ||
50b72692 HP |
9288 | if (header.find("ext3") != string::npos && s.kernel_config["CONFIG_EXT3_FS"] != string("")) |
9289 | they_live.push_back ("struct ext3_reserve_window_node;"); | |
9290 | ||
3c1b3d06 FCE |
9291 | return they_live; |
9292 | } | |
47dd066d WC |
9293 | |
9294 | ||
9295 | void | |
79189b84 | 9296 | tracepoint_derived_probe_group::emit_module_decls (systemtap_session& s) |
47dd066d | 9297 | { |
79189b84 JS |
9298 | if (probes.empty()) |
9299 | return; | |
47dd066d | 9300 | |
96b030fe JS |
9301 | s.op->newline() << "/* ---- tracepoint probes ---- */"; |
9302 | s.op->newline(); | |
79189b84 | 9303 | |
47dd066d | 9304 | |
a4b9c3b3 FCE |
9305 | // We create a MODULE_aux_N.c file for each tracepoint header, to allow them |
9306 | // to be separately compiled. That's because kernel tracepoint headers sometimes | |
9307 | // conflict. PR13155. | |
9308 | ||
9309 | map<string,translator_output*> per_header_aux; | |
9310 | // GC NB: the translator_output* structs are owned/retained by the systemtap_session. | |
47dd066d | 9311 | |
6fb70fb7 JS |
9312 | for (unsigned i = 0; i < probes.size(); ++i) |
9313 | { | |
9314 | tracepoint_derived_probe *p = probes[i]; | |
75ae2ec9 | 9315 | string header = p->header; |
5f73a260 | 9316 | |
a4b9c3b3 FCE |
9317 | // We cache the auxiliary output files on a per-header basis. We don't |
9318 | // need one aux file per tracepoint, only one per tracepoint-header. | |
9319 | translator_output *tpop = per_header_aux[header]; | |
9320 | if (tpop == 0) | |
9321 | { | |
9322 | tpop = s.op_create_auxiliary(); | |
9323 | per_header_aux[header] = tpop; | |
9324 | ||
9325 | // PR9993: Add extra headers to work around undeclared types in individual | |
9326 | // include/trace/foo.h files | |
9327 | const vector<string>& extra_decls = tracepoint_extra_decls (s, header); | |
9328 | for (unsigned z=0; z<extra_decls.size(); z++) | |
9329 | tpop->newline() << extra_decls[z] << "\n"; | |
720c435f | 9330 | |
a4b9c3b3 FCE |
9331 | // strip include/ substring, the same way as done in get_tracequery_module() |
9332 | size_t root_pos = header.rfind("include/"); | |
9333 | header = ((root_pos != string::npos) ? header.substr(root_pos + 8) : header); | |
bfffa443 FCE |
9334 | |
9335 | tpop->newline() << "#include <linux/tracepoint.h>" << endl; | |
a4b9c3b3 | 9336 | tpop->newline() << "#include <" << header << ">"; |
720c435f | 9337 | |
a4b9c3b3 FCE |
9338 | // Starting in 2.6.35, at the same time NOARGS was added, the callback |
9339 | // always has a void* as the first parameter. PR11599 | |
9340 | tpop->newline() << "#ifdef DECLARE_TRACE_NOARGS"; | |
9341 | tpop->newline() << "#define STAP_TP_DATA , NULL"; | |
9342 | tpop->newline() << "#define STAP_TP_PROTO void *cb_data" | |
9343 | << " __attribute__ ((unused))"; | |
9344 | if (!p->args.empty()) | |
9345 | tpop->line() << ","; | |
9346 | tpop->newline() << "#else"; | |
9347 | tpop->newline() << "#define STAP_TP_DATA"; | |
9348 | tpop->newline() << "#define STAP_TP_PROTO"; | |
9349 | if (p->args.empty()) | |
9350 | tpop->line() << " void"; | |
9351 | tpop->newline() << "#endif"; | |
720c435f JS |
9352 | |
9353 | tpop->newline() << "#define intptr_t long"; | |
a4b9c3b3 FCE |
9354 | } |
9355 | ||
720c435f JS |
9356 | // collect the args that are actually in use |
9357 | vector<const tracepoint_arg*> used_args; | |
6fb70fb7 | 9358 | for (unsigned j = 0; j < p->args.size(); ++j) |
720c435f JS |
9359 | if (p->args[j].used) |
9360 | used_args.push_back(&p->args[j]); | |
9361 | ||
a4b9c3b3 FCE |
9362 | // forward-declare the generated-side tracepoint callback |
9363 | tpop->newline() << "void enter_real_tracepoint_probe_" << i << "("; | |
720c435f JS |
9364 | tpop->indent(2); |
9365 | if (used_args.empty()) | |
9366 | tpop->line() << "void"; | |
9367 | for (unsigned j = 0; j < used_args.size(); ++j) | |
6fb70fb7 JS |
9368 | { |
9369 | if (j > 0) | |
a4b9c3b3 FCE |
9370 | tpop->line() << ", "; |
9371 | tpop->line() << "int64_t"; | |
6fb70fb7 | 9372 | } |
720c435f JS |
9373 | tpop->line() << ");"; |
9374 | tpop->indent(-2); | |
5f73a260 | 9375 | |
a4b9c3b3 FCE |
9376 | // define the generated-side tracepoint callback - in the main translator-output |
9377 | s.op->newline() << "void enter_real_tracepoint_probe_" << i << "("; | |
720c435f JS |
9378 | s.op->indent(2); |
9379 | if (used_args.empty()) | |
9380 | s.op->newline() << "void"; | |
9381 | for (unsigned j = 0; j < used_args.size(); ++j) | |
a4b9c3b3 | 9382 | { |
a4b9c3b3 FCE |
9383 | if (j > 0) |
9384 | s.op->line() << ", "; | |
720c435f | 9385 | s.op->newline() << "int64_t __tracepoint_arg_" << used_args[j]->name; |
6fb70fb7 | 9386 | } |
5f73a260 JS |
9387 | s.op->newline() << ")"; |
9388 | s.op->newline(-2) << "{"; | |
26e63673 | 9389 | s.op->newline(1) << "struct stap_probe * const probe = " |
faea5e16 | 9390 | << common_probe_init (p) << ";"; |
6eefe942 MW |
9391 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "probe", |
9392 | "_STP_PROBE_HANDLER_TRACEPOINT"); | |
6dceb5c9 | 9393 | s.op->newline() << "c->ips.tracepoint_name = " |
c12d974f FCE |
9394 | << lex_cast_qstring (p->tracepoint_name) |
9395 | << ";"; | |
720c435f JS |
9396 | for (unsigned j = 0; j < used_args.size(); ++j) |
9397 | { | |
9398 | s.op->newline() << "c->probe_locals." << p->name | |
9399 | << ".__tracepoint_arg_" << used_args[j]->name | |
9400 | << " = __tracepoint_arg_" << used_args[j]->name << ";"; | |
9401 | } | |
26e63673 | 9402 | s.op->newline() << "(*probe->ph) (c);"; |
7baf48e9 | 9403 | common_probe_entryfn_epilogue (s.op, true, s.suppress_handler_errors); |
6fb70fb7 | 9404 | s.op->newline(-1) << "}"; |
47dd066d | 9405 | |
a4b9c3b3 | 9406 | // define the real tracepoint callback function |
720c435f | 9407 | tpop->newline() << "static void enter_tracepoint_probe_" << i << "("; |
a4b9c3b3 FCE |
9408 | tpop->newline(2) << "STAP_TP_PROTO"; |
9409 | for (unsigned j = 0; j < p->args.size(); ++j) | |
9410 | { | |
9411 | if (j > 0) | |
9412 | tpop->line() << ", "; | |
9413 | tpop->newline() << p->args[j].c_type << " __tracepoint_arg_" << p->args[j].name; | |
9414 | } | |
9415 | tpop->newline() << ")"; | |
9416 | tpop->newline(-2) << "{"; | |
720c435f JS |
9417 | tpop->newline(1) << "enter_real_tracepoint_probe_" << i << "("; |
9418 | tpop->indent(2); | |
9419 | for (unsigned j = 0; j < used_args.size(); ++j) | |
9420 | { | |
9421 | if (j > 0) | |
9422 | tpop->line() << ", "; | |
9423 | tpop->newline() << "(int64_t)" << used_args[j]->typecast | |
9424 | << "__tracepoint_arg_" << used_args[j]->name; | |
9425 | } | |
9426 | tpop->newline() << ");"; | |
9427 | tpop->newline(-3) << "}"; | |
a4b9c3b3 FCE |
9428 | |
9429 | ||
96b030fe | 9430 | // emit normalized registration functions |
720c435f | 9431 | tpop->newline() << "int register_tracepoint_probe_" << i << "(void) {"; |
a4b9c3b3 | 9432 | tpop->newline(1) << "return register_trace_" << p->tracepoint_name |
5f73a260 | 9433 | << "(enter_tracepoint_probe_" << i << " STAP_TP_DATA);"; |
a4b9c3b3 | 9434 | tpop->newline(-1) << "}"; |
47dd066d | 9435 | |
86758d5f JS |
9436 | // NB: we're not prepared to deal with unreg failures. However, failures |
9437 | // can only occur if the tracepoint doesn't exist (yet?), or if we | |
9438 | // weren't even registered. The former should be OKed by the initial | |
9439 | // registration call, and the latter is safe to ignore. | |
720c435f | 9440 | tpop->newline() << "void unregister_tracepoint_probe_" << i << "(void) {"; |
a4b9c3b3 | 9441 | tpop->newline(1) << "(void) unregister_trace_" << p->tracepoint_name |
5f73a260 | 9442 | << "(enter_tracepoint_probe_" << i << " STAP_TP_DATA);"; |
a4b9c3b3 FCE |
9443 | tpop->newline(-1) << "}"; |
9444 | tpop->newline(); | |
5f73a260 | 9445 | |
720c435f JS |
9446 | // declare normalized registration functions |
9447 | s.op->newline() << "int register_tracepoint_probe_" << i << "(void);"; | |
9448 | s.op->newline() << "void unregister_tracepoint_probe_" << i << "(void);"; | |
5f73a260 | 9449 | |
a4b9c3b3 | 9450 | tpop->assert_0_indent(); |
af304783 DS |
9451 | } |
9452 | ||
96b030fe JS |
9453 | // emit an array of registration functions for easy init/shutdown |
9454 | s.op->newline() << "static struct stap_tracepoint_probe {"; | |
9455 | s.op->newline(1) << "int (*reg)(void);"; | |
86758d5f | 9456 | s.op->newline(0) << "void (*unreg)(void);"; |
96b030fe JS |
9457 | s.op->newline(-1) << "} stap_tracepoint_probes[] = {"; |
9458 | s.op->indent(1); | |
9459 | for (unsigned i = 0; i < probes.size(); ++i) | |
9460 | { | |
9461 | s.op->newline () << "{"; | |
9462 | s.op->line() << " .reg=®ister_tracepoint_probe_" << i << ","; | |
9463 | s.op->line() << " .unreg=&unregister_tracepoint_probe_" << i; | |
9464 | s.op->line() << " },"; | |
9465 | } | |
9466 | s.op->newline(-1) << "};"; | |
9467 | s.op->newline(); | |
47dd066d WC |
9468 | } |
9469 | ||
9470 | ||
79189b84 JS |
9471 | void |
9472 | tracepoint_derived_probe_group::emit_module_init (systemtap_session &s) | |
47dd066d | 9473 | { |
79189b84 JS |
9474 | if (probes.size () == 0) |
9475 | return; | |
47dd066d | 9476 | |
79189b84 | 9477 | s.op->newline() << "/* init tracepoint probes */"; |
96b030fe JS |
9478 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++) {"; |
9479 | s.op->newline(1) << "rc = stap_tracepoint_probes[i].reg();"; | |
9480 | s.op->newline() << "if (rc) {"; | |
9481 | s.op->newline(1) << "for (j=i-1; j>=0; j--)"; // partial rollback | |
9482 | s.op->newline(1) << "stap_tracepoint_probes[j].unreg();"; | |
9483 | s.op->newline(-1) << "break;"; // don't attempt to register any more probes | |
9484 | s.op->newline(-1) << "}"; | |
9485 | s.op->newline(-1) << "}"; | |
47dd066d | 9486 | |
bc9a523d FCE |
9487 | // This would be technically proper (on those autoconf-detectable |
9488 | // kernels that include this function in tracepoint.h), however we | |
9489 | // already make several calls to synchronze_sched() during our | |
9490 | // shutdown processes. | |
47dd066d | 9491 | |
bc9a523d FCE |
9492 | // s.op->newline() << "if (rc)"; |
9493 | // s.op->newline(1) << "tracepoint_synchronize_unregister();"; | |
9494 | // s.op->indent(-1); | |
79189b84 | 9495 | } |
47dd066d WC |
9496 | |
9497 | ||
79189b84 JS |
9498 | void |
9499 | tracepoint_derived_probe_group::emit_module_exit (systemtap_session& s) | |
47dd066d | 9500 | { |
79189b84 JS |
9501 | if (probes.empty()) |
9502 | return; | |
47dd066d | 9503 | |
96b030fe JS |
9504 | s.op->newline() << "/* deregister tracepoint probes */"; |
9505 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++)"; | |
9506 | s.op->newline(1) << "stap_tracepoint_probes[i].unreg();"; | |
9507 | s.op->indent(-1); | |
47dd066d | 9508 | |
bc9a523d | 9509 | // Not necessary: see above. |
47dd066d | 9510 | |
bc9a523d | 9511 | // s.op->newline() << "tracepoint_synchronize_unregister();"; |
79189b84 | 9512 | } |
b20febf3 | 9513 | |
47dd066d | 9514 | |
75ead1f7 | 9515 | struct tracepoint_query : public base_query |
47dd066d | 9516 | { |
75ead1f7 JS |
9517 | tracepoint_query(dwflpp & dw, const string & tracepoint, |
9518 | probe * base_probe, probe_point * base_loc, | |
9519 | vector<derived_probe *> & results): | |
9520 | base_query(dw, "*"), tracepoint(tracepoint), | |
9521 | base_probe(base_probe), base_loc(base_loc), | |
9522 | results(results) {} | |
47dd066d | 9523 | |
75ead1f7 | 9524 | const string& tracepoint; |
47dd066d | 9525 | |
75ead1f7 JS |
9526 | probe * base_probe; |
9527 | probe_point * base_loc; | |
9528 | vector<derived_probe *> & results; | |
f982c59b | 9529 | set<string> probed_names; |
47dd066d | 9530 | |
75ead1f7 JS |
9531 | void handle_query_module(); |
9532 | int handle_query_cu(Dwarf_Die * cudie); | |
9533 | int handle_query_func(Dwarf_Die * func); | |
822a6a3d | 9534 | void query_library (const char *) {} |
576eaefe | 9535 | void query_plt (const char *entry, size_t addr) {} |
b20febf3 | 9536 | |
75ead1f7 JS |
9537 | static int tracepoint_query_cu (Dwarf_Die * cudie, void * arg); |
9538 | static int tracepoint_query_func (Dwarf_Die * func, base_query * query); | |
9539 | }; | |
47dd066d WC |
9540 | |
9541 | ||
9542 | void | |
75ead1f7 | 9543 | tracepoint_query::handle_query_module() |
47dd066d | 9544 | { |
75ead1f7 | 9545 | // look for the tracepoints in each CU |
337b7c44 | 9546 | dw.iterate_over_cus(tracepoint_query_cu, this, false); |
47dd066d WC |
9547 | } |
9548 | ||
9549 | ||
75ead1f7 JS |
9550 | int |
9551 | tracepoint_query::handle_query_cu(Dwarf_Die * cudie) | |
47dd066d | 9552 | { |
75ead1f7 | 9553 | dw.focus_on_cu (cudie); |
47dd066d | 9554 | |
75ead1f7 JS |
9555 | // look at each function to see if it's a tracepoint |
9556 | string function = "stapprobe_" + tracepoint; | |
9557 | return dw.iterate_over_functions (tracepoint_query_func, this, function); | |
47dd066d WC |
9558 | } |
9559 | ||
9560 | ||
75ead1f7 JS |
9561 | int |
9562 | tracepoint_query::handle_query_func(Dwarf_Die * func) | |
47dd066d | 9563 | { |
75ead1f7 | 9564 | dw.focus_on_function (func); |
47dd066d | 9565 | |
60d98537 | 9566 | assert(startswith(dw.function_name, "stapprobe_")); |
75ead1f7 | 9567 | string tracepoint_instance = dw.function_name.substr(10); |
f982c59b JS |
9568 | |
9569 | // check for duplicates -- sometimes tracepoint headers may be indirectly | |
9570 | // included in more than one of our tracequery modules. | |
9571 | if (!probed_names.insert(tracepoint_instance).second) | |
9572 | return DWARF_CB_OK; | |
9573 | ||
79189b84 JS |
9574 | derived_probe *dp = new tracepoint_derived_probe (dw.sess, dw, *func, |
9575 | tracepoint_instance, | |
9576 | base_probe, base_loc); | |
9577 | results.push_back (dp); | |
75ead1f7 | 9578 | return DWARF_CB_OK; |
47dd066d WC |
9579 | } |
9580 | ||
9581 | ||
75ead1f7 JS |
9582 | int |
9583 | tracepoint_query::tracepoint_query_cu (Dwarf_Die * cudie, void * arg) | |
47dd066d | 9584 | { |
75ead1f7 | 9585 | tracepoint_query * q = static_cast<tracepoint_query *>(arg); |
85007c04 | 9586 | if (pending_interrupts) return DWARF_CB_ABORT; |
75ead1f7 | 9587 | return q->handle_query_cu(cudie); |
47dd066d WC |
9588 | } |
9589 | ||
9590 | ||
75ead1f7 JS |
9591 | int |
9592 | tracepoint_query::tracepoint_query_func (Dwarf_Die * func, base_query * query) | |
47dd066d | 9593 | { |
75ead1f7 | 9594 | tracepoint_query * q = static_cast<tracepoint_query *>(query); |
85007c04 | 9595 | if (pending_interrupts) return DWARF_CB_ABORT; |
75ead1f7 | 9596 | return q->handle_query_func(func); |
47dd066d WC |
9597 | } |
9598 | ||
9599 | ||
0a6f5a3f | 9600 | struct tracepoint_builder: public derived_probe_builder |
47dd066d | 9601 | { |
0a6f5a3f JS |
9602 | private: |
9603 | dwflpp *dw; | |
9604 | bool init_dw(systemtap_session& s); | |
c9ccb642 FCE |
9605 | void get_tracequery_modules(systemtap_session& s, |
9606 | const vector<string>& headers, | |
9607 | vector<string>& modules); | |
47dd066d | 9608 | |
0a6f5a3f | 9609 | public: |
47dd066d | 9610 | |
0a6f5a3f JS |
9611 | tracepoint_builder(): dw(0) {} |
9612 | ~tracepoint_builder() { delete dw; } | |
47dd066d | 9613 | |
0a6f5a3f JS |
9614 | void build_no_more (systemtap_session& s) |
9615 | { | |
9616 | if (dw && s.verbose > 3) | |
b530b5b3 | 9617 | clog << _("tracepoint_builder releasing dwflpp") << endl; |
0a6f5a3f JS |
9618 | delete dw; |
9619 | dw = NULL; | |
435f53a7 FCE |
9620 | |
9621 | delete_session_module_cache (s); | |
0a6f5a3f | 9622 | } |
47dd066d | 9623 | |
0a6f5a3f JS |
9624 | void build(systemtap_session& s, |
9625 | probe *base, probe_point *location, | |
9626 | literal_map_t const& parameters, | |
9627 | vector<derived_probe*>& finished_results); | |
9628 | }; | |
47dd066d | 9629 | |
47dd066d | 9630 | |
c9ccb642 | 9631 | |
2a0e62a8 | 9632 | // Create (or cache) one or more tracequery .o modules, based upon the |
c9ccb642 FCE |
9633 | // tracepoint-related header files given. Return the generated or cached |
9634 | // modules[]. | |
9635 | ||
9636 | void | |
9637 | tracepoint_builder::get_tracequery_modules(systemtap_session& s, | |
9638 | const vector<string>& headers, | |
9639 | vector<string>& modules) | |
0a6f5a3f | 9640 | { |
c95eddf7 | 9641 | if (s.verbose > 2) |
55e50c24 | 9642 | { |
ce0f6648 | 9643 | clog << _F("Pass 2: getting a tracepoint query for %zu headers: ", headers.size()) << endl; |
55e50c24 JS |
9644 | for (size_t i = 0; i < headers.size(); ++i) |
9645 | clog << " " << headers[i] << endl; | |
9646 | } | |
c95eddf7 | 9647 | |
2a0e62a8 JS |
9648 | map<string,string> headers_cache_obj; // header name -> cache/.../tracequery_hash.o file name |
9649 | // Map the headers to cache .o names. Note that this has side-effects of | |
c9ccb642 FCE |
9650 | // creating the $SYSTEMTAP_DIR/.cache/XX/... directory and the hash-log file, |
9651 | // so we prefer not to repeat this. | |
9652 | vector<string> uncached_headers; | |
9653 | for (size_t i=0; i<headers.size(); i++) | |
2a0e62a8 | 9654 | headers_cache_obj[headers[i]] = find_tracequery_hash(s, headers[i]); |
c9ccb642 FCE |
9655 | |
9656 | // They may be in the cache already. | |
9657 | if (s.use_cache && !s.poison_cache) | |
9658 | for (size_t i=0; i<headers.size(); i++) | |
9659 | { | |
9660 | // see if the cached module exists | |
2a0e62a8 | 9661 | const string& tracequery_path = headers_cache_obj[headers[i]]; |
c9ccb642 FCE |
9662 | if (!tracequery_path.empty() && file_exists(tracequery_path)) |
9663 | { | |
9664 | if (s.verbose > 2) | |
9665 | clog << _F("Pass 2: using cached %s", tracequery_path.c_str()) << endl; | |
47dd066d | 9666 | |
c252fca2 JS |
9667 | // an empty file is a cached failure |
9668 | if (get_file_size(tracequery_path) > 0) | |
9669 | modules.push_back (tracequery_path); | |
c9ccb642 FCE |
9670 | } |
9671 | else | |
9672 | uncached_headers.push_back(headers[i]); | |
9673 | } | |
9674 | else | |
9675 | uncached_headers = headers; | |
f982c59b | 9676 | |
c9ccb642 FCE |
9677 | // If we have nothing left to search for, quit |
9678 | if (uncached_headers.empty()) return; | |
55e50c24 | 9679 | |
c9ccb642 | 9680 | map<string,string> headers_tracequery_src; // header -> C-source code mapping |
55e50c24 | 9681 | |
c9ccb642 FCE |
9682 | // We could query several subsets of headers[] to make this go |
9683 | // faster, but let's KISS and do one at a time. | |
9684 | for (size_t i=0; i<uncached_headers.size(); i++) | |
55e50c24 | 9685 | { |
c9ccb642 FCE |
9686 | const string& header = uncached_headers[i]; |
9687 | ||
9688 | // create a tracequery source file | |
9689 | ostringstream osrc; | |
9690 | ||
9691 | // PR9993: Add extra headers to work around undeclared types in individual | |
9692 | // include/trace/foo.h files | |
9693 | vector<string> short_decls = tracepoint_extra_decls(s, header); | |
9694 | ||
9695 | // add each requested tracepoint header | |
75ae2ec9 | 9696 | size_t root_pos = header.rfind("include/"); |
832f100d | 9697 | short_decls.push_back(string("#include <") + |
75ae2ec9 | 9698 | ((root_pos != string::npos) ? header.substr(root_pos + 8) : header) + |
d4393459 | 9699 | string(">")); |
f982c59b | 9700 | |
c9ccb642 FCE |
9701 | osrc << "#ifdef CONFIG_TRACEPOINTS" << endl; |
9702 | osrc << "#include <linux/tracepoint.h>" << endl; | |
832f100d JS |
9703 | |
9704 | // the kernel has changed this naming a few times, previously TPPROTO, | |
9705 | // TP_PROTO, TPARGS, TP_ARGS, etc. so let's just dupe the latest. | |
9706 | osrc << "#ifndef PARAMS" << endl; | |
9707 | osrc << "#define PARAMS(args...) args" << endl; | |
9708 | osrc << "#endif" << endl; | |
9709 | ||
c9ccb642 FCE |
9710 | // override DECLARE_TRACE to synthesize probe functions for us |
9711 | osrc << "#undef DECLARE_TRACE" << endl; | |
9712 | osrc << "#define DECLARE_TRACE(name, proto, args) \\" << endl; | |
9713 | osrc << " void stapprobe_##name(proto) {}" << endl; | |
832f100d | 9714 | |
c9ccb642 FCE |
9715 | // 2.6.35 added the NOARGS variant, but it's the same for us |
9716 | osrc << "#undef DECLARE_TRACE_NOARGS" << endl; | |
9717 | osrc << "#define DECLARE_TRACE_NOARGS(name) \\" << endl; | |
9718 | osrc << " DECLARE_TRACE(name, void, )" << endl; | |
832f100d JS |
9719 | |
9720 | // 2.6.38 added the CONDITION variant, which can also just redirect | |
9721 | osrc << "#undef DECLARE_TRACE_CONDITION" << endl; | |
9722 | osrc << "#define DECLARE_TRACE_CONDITION(name, proto, args, cond) \\" << endl; | |
9723 | osrc << " DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))" << endl; | |
9724 | ||
c9ccb642 FCE |
9725 | // older tracepoints used DEFINE_TRACE, so redirect that too |
9726 | osrc << "#undef DEFINE_TRACE" << endl; | |
9727 | osrc << "#define DEFINE_TRACE(name, proto, args) \\" << endl; | |
832f100d JS |
9728 | osrc << " DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))" << endl; |
9729 | ||
c9ccb642 FCE |
9730 | // add the specified decls/#includes |
9731 | for (unsigned z=0; z<short_decls.size(); z++) | |
9732 | osrc << "#undef TRACE_INCLUDE_FILE\n" | |
9733 | << "#undef TRACE_INCLUDE_PATH\n" | |
9734 | << short_decls[z] << "\n"; | |
9735 | ||
9736 | // finish up the module source | |
9737 | osrc << "#endif /* CONFIG_TRACEPOINTS */" << endl; | |
47dd066d | 9738 | |
c9ccb642 FCE |
9739 | // save the source file away |
9740 | headers_tracequery_src[header] = osrc.str(); | |
55e50c24 | 9741 | } |
f982c59b | 9742 | |
c9ccb642 | 9743 | // now build them all together |
2a0e62a8 | 9744 | map<string,string> tracequery_objs = make_tracequeries(s, headers_tracequery_src); |
47dd066d | 9745 | |
c9ccb642 | 9746 | // now plop them into the cache |
b278033a | 9747 | if (s.use_cache) |
c9ccb642 FCE |
9748 | for (size_t i=0; i<uncached_headers.size(); i++) |
9749 | { | |
9750 | const string& header = uncached_headers[i]; | |
2a0e62a8 JS |
9751 | const string& tracequery_obj = tracequery_objs[header]; |
9752 | const string& tracequery_path = headers_cache_obj[header]; | |
9753 | if (tracequery_obj !="" && file_exists(tracequery_obj)) | |
c9ccb642 | 9754 | { |
2a0e62a8 | 9755 | copy_file(tracequery_obj, tracequery_path, s.verbose > 2); |
c9ccb642 FCE |
9756 | modules.push_back (tracequery_path); |
9757 | } | |
c252fca2 JS |
9758 | else |
9759 | // cache an empty file for failures | |
9760 | copy_file("/dev/null", tracequery_path, s.verbose > 2); | |
c9ccb642 | 9761 | } |
f982c59b JS |
9762 | } |
9763 | ||
9764 | ||
d4393459 | 9765 | |
f982c59b JS |
9766 | bool |
9767 | tracepoint_builder::init_dw(systemtap_session& s) | |
9768 | { | |
9769 | if (dw != NULL) | |
9770 | return true; | |
9771 | ||
9772 | vector<string> tracequery_modules; | |
55e50c24 | 9773 | vector<string> system_headers; |
f982c59b JS |
9774 | |
9775 | glob_t trace_glob; | |
d4393459 FCE |
9776 | |
9777 | // find kernel_source_tree | |
9778 | if (s.kernel_source_tree == "") | |
f982c59b | 9779 | { |
d4393459 FCE |
9780 | unsigned found; |
9781 | DwflPtr dwfl_ptr = setup_dwfl_kernel ("kernel", &found, s); | |
9782 | Dwfl *dwfl = dwfl_ptr.get()->dwfl; | |
9783 | if (found) | |
9784 | { | |
9785 | Dwarf_Die *cudie = 0; | |
9786 | Dwarf_Addr bias; | |
9787 | while ((cudie = dwfl_nextcu (dwfl, cudie, &bias)) != NULL) | |
9788 | { | |
9789 | if (pending_interrupts) break; | |
9790 | Dwarf_Attribute attr; | |
9791 | const char* name = dwarf_formstring (dwarf_attr (cudie, DW_AT_comp_dir, &attr)); | |
9792 | if (name) | |
9793 | { | |
61f1a63b | 9794 | if (s.verbose > 2) |
b530b5b3 | 9795 | clog << _F("Located kernel source tree (DW_AT_comp_dir) at '%s'", name) << endl; |
61f1a63b | 9796 | |
d4393459 FCE |
9797 | s.kernel_source_tree = name; |
9798 | break; // skip others; modern Kbuild uses same comp_dir for them all | |
9799 | } | |
9800 | } | |
9801 | } | |
9802 | } | |
9803 | ||
9804 | // prefixes | |
9805 | vector<string> glob_prefixes; | |
9806 | glob_prefixes.push_back (s.kernel_build_tree); | |
9807 | if (s.kernel_source_tree != "") | |
9808 | glob_prefixes.push_back (s.kernel_source_tree); | |
9809 | ||
9810 | // suffixes | |
9811 | vector<string> glob_suffixes; | |
9812 | glob_suffixes.push_back("include/trace/events/*.h"); | |
9813 | glob_suffixes.push_back("include/trace/*.h"); | |
9814 | glob_suffixes.push_back("arch/x86/kvm/*trace.h"); | |
f89ff3e2 | 9815 | glob_suffixes.push_back("fs/xfs/linux-*/xfs_tr*.h"); |
d4393459 FCE |
9816 | |
9817 | // compute cartesian product | |
9818 | vector<string> globs; | |
9819 | for (unsigned i=0; i<glob_prefixes.size(); i++) | |
9820 | for (unsigned j=0; j<glob_suffixes.size(); j++) | |
9821 | globs.push_back (glob_prefixes[i]+string("/")+glob_suffixes[j]); | |
9822 | ||
8aa43b8d | 9823 | set<string> duped_headers; |
d4393459 FCE |
9824 | for (unsigned z = 0; z < globs.size(); z++) |
9825 | { | |
9826 | string glob_str = globs[z]; | |
9827 | if (s.verbose > 3) | |
b530b5b3 | 9828 | clog << _("Checking tracepoint glob ") << glob_str << endl; |
d4393459 | 9829 | |
f982c59b JS |
9830 | glob(glob_str.c_str(), 0, NULL, &trace_glob); |
9831 | for (unsigned i = 0; i < trace_glob.gl_pathc; ++i) | |
9832 | { | |
9833 | string header(trace_glob.gl_pathv[i]); | |
9834 | ||
9835 | // filter out a few known "internal-only" headers | |
60d98537 JS |
9836 | if (endswith(header, "/define_trace.h") || |
9837 | endswith(header, "/ftrace.h") || | |
9838 | endswith(header, "/trace_events.h") || | |
9839 | endswith(header, "_event_types.h")) | |
f982c59b JS |
9840 | continue; |
9841 | ||
8aa43b8d JS |
9842 | // skip identical headers from the build and source trees. |
9843 | size_t root_pos = header.rfind("include/"); | |
9844 | if (root_pos != string::npos && | |
9845 | !duped_headers.insert(header.substr(root_pos + 8)).second) | |
9846 | continue; | |
9847 | ||
55e50c24 | 9848 | system_headers.push_back(header); |
f982c59b JS |
9849 | } |
9850 | globfree(&trace_glob); | |
9851 | } | |
9852 | ||
c9ccb642 FCE |
9853 | // Build tracequery modules |
9854 | get_tracequery_modules(s, system_headers, tracequery_modules); | |
55e50c24 | 9855 | |
f982c59b JS |
9856 | // TODO: consider other sources of tracepoint headers too, like from |
9857 | // a command-line parameter or some environment or .systemtaprc | |
47dd066d | 9858 | |
59c11f91 | 9859 | dw = new dwflpp(s, tracequery_modules, true); |
0a6f5a3f JS |
9860 | return true; |
9861 | } | |
47dd066d | 9862 | |
0a6f5a3f JS |
9863 | void |
9864 | tracepoint_builder::build(systemtap_session& s, | |
9865 | probe *base, probe_point *location, | |
9866 | literal_map_t const& parameters, | |
9867 | vector<derived_probe*>& finished_results) | |
9868 | { | |
9869 | if (!init_dw(s)) | |
9870 | return; | |
47dd066d | 9871 | |
75ead1f7 JS |
9872 | string tracepoint; |
9873 | assert(get_param (parameters, TOK_TRACE, tracepoint)); | |
47dd066d | 9874 | |
75ead1f7 | 9875 | tracepoint_query q(*dw, tracepoint, base, location, finished_results); |
51178501 | 9876 | dw->iterate_over_modules(&query_module, &q); |
47dd066d | 9877 | } |
47dd066d | 9878 | |
e6fe60e7 | 9879 | |
b55bc428 | 9880 | // ------------------------------------------------------------------------ |
bd2b1e68 | 9881 | // Standard tapset registry. |
b55bc428 FCE |
9882 | // ------------------------------------------------------------------------ |
9883 | ||
7a053d3b | 9884 | void |
f8220a7b | 9885 | register_standard_tapsets(systemtap_session & s) |
b55bc428 | 9886 | { |
47e0478e | 9887 | register_tapset_been(s); |
93646f4d | 9888 | register_tapset_itrace(s); |
dd0e4fa7 | 9889 | register_tapset_mark(s); |
7a212aa8 | 9890 | register_tapset_procfs(s); |
912e8c59 | 9891 | register_tapset_timers(s); |
b84779a5 | 9892 | register_tapset_utrace(s); |
b98a8d73 | 9893 | |
7a24d422 | 9894 | // dwarf-based kprobe/uprobe parts |
c4ce66a1 | 9895 | dwarf_derived_probe::register_patterns(s); |
30a279be | 9896 | |
888af770 FCE |
9897 | // XXX: user-space starter set |
9898 | s.pattern_root->bind_num(TOK_PROCESS) | |
9899 | ->bind_num(TOK_STATEMENT)->bind(TOK_ABSOLUTE) | |
f66bb29a | 9900 | ->bind_privilege(pr_all) |
888af770 FCE |
9901 | ->bind(new uprobe_builder ()); |
9902 | s.pattern_root->bind_num(TOK_PROCESS) | |
9903 | ->bind_num(TOK_STATEMENT)->bind(TOK_ABSOLUTE)->bind(TOK_RETURN) | |
f66bb29a | 9904 | ->bind_privilege(pr_all) |
888af770 FCE |
9905 | ->bind(new uprobe_builder ()); |
9906 | ||
0a6f5a3f JS |
9907 | // kernel tracepoint probes |
9908 | s.pattern_root->bind(TOK_KERNEL)->bind_str(TOK_TRACE) | |
9909 | ->bind(new tracepoint_builder()); | |
9910 | ||
e6fe60e7 AM |
9911 | // Kprobe based probe |
9912 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION) | |
9913 | ->bind(new kprobe_builder()); | |
9914 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) | |
9915 | ->bind_str(TOK_FUNCTION)->bind(new kprobe_builder()); | |
9916 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION)->bind(TOK_RETURN) | |
9917 | ->bind(new kprobe_builder()); | |
b6371390 JS |
9918 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_FUNCTION)->bind(TOK_RETURN) |
9919 | ->bind_num(TOK_MAXACTIVE)->bind(new kprobe_builder()); | |
e6fe60e7 AM |
9920 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) |
9921 | ->bind_str(TOK_FUNCTION)->bind(TOK_RETURN)->bind(new kprobe_builder()); | |
b6371390 JS |
9922 | s.pattern_root->bind(TOK_KPROBE)->bind_str(TOK_MODULE) |
9923 | ->bind_str(TOK_FUNCTION)->bind(TOK_RETURN) | |
9924 | ->bind_num(TOK_MAXACTIVE)->bind(new kprobe_builder()); | |
e6fe60e7 AM |
9925 | s.pattern_root->bind(TOK_KPROBE)->bind_num(TOK_STATEMENT) |
9926 | ->bind(TOK_ABSOLUTE)->bind(new kprobe_builder()); | |
dd225250 PS |
9927 | |
9928 | //Hwbkpt based probe | |
b47f3a55 FCE |
9929 | // NB: we formerly registered the probe point types only if the kernel configuration |
9930 | // allowed it. However, we get better error messages if we allow probes to resolve. | |
9931 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
9932 | ->bind(TOK_HWBKPT_WRITE)->bind(new hwbkpt_builder()); | |
9933 | s.pattern_root->bind(TOK_KERNEL)->bind_str(TOK_HWBKPT) | |
9934 | ->bind(TOK_HWBKPT_WRITE)->bind(new hwbkpt_builder()); | |
9935 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
9936 | ->bind(TOK_HWBKPT_RW)->bind(new hwbkpt_builder()); | |
9937 | s.pattern_root->bind(TOK_KERNEL)->bind_str(TOK_HWBKPT) | |
9938 | ->bind(TOK_HWBKPT_RW)->bind(new hwbkpt_builder()); | |
9939 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
9940 | ->bind_num(TOK_LENGTH)->bind(TOK_HWBKPT_WRITE)->bind(new hwbkpt_builder()); | |
9941 | s.pattern_root->bind(TOK_KERNEL)->bind_num(TOK_HWBKPT) | |
9942 | ->bind_num(TOK_LENGTH)->bind(TOK_HWBKPT_RW)->bind(new hwbkpt_builder()); | |
9943 | // length supported with address only, not symbol names | |
83ea76b1 WC |
9944 | |
9945 | //perf event based probe | |
4763f713 | 9946 | register_tapset_perf(s); |
b55bc428 | 9947 | } |
dc38c0ae DS |
9948 | |
9949 | ||
b20febf3 FCE |
9950 | vector<derived_probe_group*> |
9951 | all_session_groups(systemtap_session& s) | |
dc38c0ae | 9952 | { |
b20febf3 | 9953 | vector<derived_probe_group*> g; |
912e8c59 JS |
9954 | |
9955 | #define DOONE(x) \ | |
9956 | if (s. x##_derived_probes) \ | |
9957 | g.push_back ((derived_probe_group*)(s. x##_derived_probes)) | |
ab655cf8 DS |
9958 | |
9959 | // Note that order *is* important here. We want to make sure we | |
9960 | // register (actually run) begin probes before any other probe type | |
9961 | // is run. Similarly, when unregistering probes, we want to | |
9962 | // unregister (actually run) end probes after every other probe type | |
9963 | // has be unregistered. To do the latter, | |
9964 | // c_unparser::emit_module_exit() will run this list backwards. | |
b20febf3 FCE |
9965 | DOONE(be); |
9966 | DOONE(dwarf); | |
888af770 | 9967 | DOONE(uprobe); |
b20febf3 FCE |
9968 | DOONE(timer); |
9969 | DOONE(profile); | |
9970 | DOONE(mark); | |
0a6f5a3f | 9971 | DOONE(tracepoint); |
e6fe60e7 | 9972 | DOONE(kprobe); |
dd225250 | 9973 | DOONE(hwbkpt); |
83ea76b1 | 9974 | DOONE(perf); |
b20febf3 | 9975 | DOONE(hrtimer); |
ce82316f | 9976 | DOONE(procfs); |
935447c8 DS |
9977 | |
9978 | // Another "order is important" item. We want to make sure we | |
9979 | // "register" the dummy task_finder probe group after all probe | |
9980 | // groups that use the task_finder. | |
9981 | DOONE(utrace); | |
a96d1db0 | 9982 | DOONE(itrace); |
935447c8 | 9983 | DOONE(task_finder); |
b20febf3 FCE |
9984 | #undef DOONE |
9985 | return g; | |
46b84a80 | 9986 | } |
73267b89 JS |
9987 | |
9988 | /* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */ |