Line data Source code
1 : /* Internal definitions for libdwfl.
2 : Copyright (C) 2005-2015, 2018 Red Hat, Inc.
3 : This file is part of elfutils.
4 :
5 : This file is free software; you can redistribute it and/or modify
6 : it under the terms of either
7 :
8 : * the GNU Lesser General Public License as published by the Free
9 : Software Foundation; either version 3 of the License, or (at
10 : your option) any later version
11 :
12 : or
13 :
14 : * the GNU General Public License as published by the Free
15 : Software Foundation; either version 2 of the License, or (at
16 : your option) any later version
17 :
18 : or both in parallel, as here.
19 :
20 : elfutils is distributed in the hope that it will be useful, but
21 : WITHOUT ANY WARRANTY; without even the implied warranty of
22 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 : General Public License for more details.
24 :
25 : You should have received copies of the GNU General Public License and
26 : the GNU Lesser General Public License along with this program. If
27 : not, see <http://www.gnu.org/licenses/>. */
28 :
29 : #ifndef _LIBDWFLP_H
30 : #define _LIBDWFLP_H 1
31 :
32 : #include <libdwfl.h>
33 : #include <libebl.h>
34 : #include <assert.h>
35 : #include <dirent.h>
36 : #include <errno.h>
37 : #include <stdbool.h>
38 : #include <stdlib.h>
39 : #include <string.h>
40 :
41 : #include "../libdw/libdwP.h" /* We need its INTDECLs. */
42 : #include "../libdwelf/libdwelfP.h"
43 :
44 : typedef struct Dwfl_Process Dwfl_Process;
45 :
46 : /* gettext helper macros. */
47 : #define _(Str) dgettext ("elfutils", Str)
48 :
49 : #define DWFL_ERRORS \
50 : DWFL_ERROR (NOERROR, N_("no error")) \
51 : DWFL_ERROR (UNKNOWN_ERROR, N_("unknown error")) \
52 : DWFL_ERROR (NOMEM, N_("out of memory")) \
53 : DWFL_ERROR (ERRNO, N_("See errno")) \
54 : DWFL_ERROR (LIBELF, N_("See elf_errno")) \
55 : DWFL_ERROR (LIBDW, N_("See dwarf_errno")) \
56 : DWFL_ERROR (LIBEBL, N_("See ebl_errno (XXX missing)")) \
57 : DWFL_ERROR (ZLIB, N_("gzip decompression failed")) \
58 : DWFL_ERROR (BZLIB, N_("bzip2 decompression failed")) \
59 : DWFL_ERROR (LZMA, N_("LZMA decompression failed")) \
60 : DWFL_ERROR (UNKNOWN_MACHINE, N_("no support library found for machine")) \
61 : DWFL_ERROR (NOREL, N_("Callbacks missing for ET_REL file")) \
62 : DWFL_ERROR (BADRELTYPE, N_("Unsupported relocation type")) \
63 : DWFL_ERROR (BADRELOFF, N_("r_offset is bogus")) \
64 : DWFL_ERROR (BADSTROFF, N_("offset out of range")) \
65 : DWFL_ERROR (RELUNDEF, N_("relocation refers to undefined symbol")) \
66 : DWFL_ERROR (CB, N_("Callback returned failure")) \
67 : DWFL_ERROR (NO_DWARF, N_("No DWARF information found")) \
68 : DWFL_ERROR (NO_SYMTAB, N_("No symbol table found")) \
69 : DWFL_ERROR (NO_PHDR, N_("No ELF program headers")) \
70 : DWFL_ERROR (OVERLAP, N_("address range overlaps an existing module")) \
71 : DWFL_ERROR (ADDR_OUTOFRANGE, N_("address out of range")) \
72 : DWFL_ERROR (NO_MATCH, N_("no matching address range")) \
73 : DWFL_ERROR (TRUNCATED, N_("image truncated")) \
74 : DWFL_ERROR (ALREADY_ELF, N_("ELF file opened")) \
75 : DWFL_ERROR (BADELF, N_("not a valid ELF file")) \
76 : DWFL_ERROR (WEIRD_TYPE, N_("cannot handle DWARF type description")) \
77 : DWFL_ERROR (WRONG_ID_ELF, N_("ELF file does not match build ID")) \
78 : DWFL_ERROR (BAD_PRELINK, N_("corrupt .gnu.prelink_undo section data")) \
79 : DWFL_ERROR (LIBEBL_BAD, N_("Internal error due to ebl")) \
80 : DWFL_ERROR (CORE_MISSING, N_("Missing data in core file")) \
81 : DWFL_ERROR (INVALID_REGISTER, N_("Invalid register")) \
82 : DWFL_ERROR (PROCESS_MEMORY_READ, N_("Error reading process memory")) \
83 : DWFL_ERROR (PROCESS_NO_ARCH, N_("Couldn't find architecture of any ELF")) \
84 : DWFL_ERROR (PARSE_PROC, N_("Error parsing /proc filesystem")) \
85 : DWFL_ERROR (INVALID_DWARF, N_("Invalid DWARF")) \
86 : DWFL_ERROR (UNSUPPORTED_DWARF, N_("Unsupported DWARF")) \
87 : DWFL_ERROR (NEXT_THREAD_FAIL, N_("Unable to find more threads")) \
88 : DWFL_ERROR (ATTACH_STATE_CONFLICT, N_("Dwfl already has attached state")) \
89 : DWFL_ERROR (NO_ATTACH_STATE, N_("Dwfl has no attached state")) \
90 : DWFL_ERROR (NO_UNWIND, N_("Unwinding not supported for this architecture")) \
91 : DWFL_ERROR (INVALID_ARGUMENT, N_("Invalid argument")) \
92 : DWFL_ERROR (NO_CORE_FILE, N_("Not an ET_CORE ELF file"))
93 :
94 : #define DWFL_ERROR(name, text) DWFL_E_##name,
95 : typedef enum { DWFL_ERRORS DWFL_E_NUM } Dwfl_Error;
96 : #undef DWFL_ERROR
97 :
98 : #define OTHER_ERROR(name) ((unsigned int) DWFL_E_##name << 16)
99 : #define DWFL_E(name, errno) (OTHER_ERROR (name) | (errno))
100 :
101 : extern int __libdwfl_canon_error (Dwfl_Error) internal_function;
102 : extern void __libdwfl_seterrno (Dwfl_Error) internal_function;
103 :
104 : /* Resources we might keep for the user about the core file that the
105 : Dwfl might have been created from. Can currently only be set
106 : through std-argp. */
107 : struct Dwfl_User_Core
108 : {
109 : char *executable_for_core; /* --executable if --core was specified. */
110 : Elf *core; /* non-NULL if we need to free it. */
111 : int fd; /* close if >= 0. */
112 : };
113 :
114 : struct Dwfl
115 : {
116 : const Dwfl_Callbacks *callbacks;
117 :
118 : Dwfl_Module *modulelist; /* List in order used by full traversals. */
119 :
120 : Dwfl_Process *process;
121 : Dwfl_Error attacherr; /* Previous error attaching process. */
122 :
123 : GElf_Addr offline_next_address;
124 :
125 : GElf_Addr segment_align; /* Smallest granularity of segments. */
126 :
127 : /* Binary search table in three parallel malloc'd arrays. */
128 : size_t lookup_elts; /* Elements in use. */
129 : size_t lookup_alloc; /* Elements allococated. */
130 : GElf_Addr *lookup_addr; /* Start address of segment. */
131 : Dwfl_Module **lookup_module; /* Module associated with segment, or null. */
132 : int *lookup_segndx; /* User segment index, or -1. */
133 :
134 : /* Cache from last dwfl_report_segment call. */
135 : const void *lookup_tail_ident;
136 : GElf_Off lookup_tail_vaddr;
137 : GElf_Off lookup_tail_offset;
138 : int lookup_tail_ndx;
139 :
140 : struct Dwfl_User_Core *user_core;
141 : };
142 :
143 : #define OFFLINE_REDZONE 0x10000
144 :
145 : struct dwfl_file
146 : {
147 : char *name;
148 : int fd;
149 : bool valid; /* The build ID note has been matched. */
150 : bool relocated; /* Partial relocation of all sections done. */
151 :
152 : Elf *elf;
153 :
154 : /* This is the lowest p_vaddr in this ELF file, aligned to p_align.
155 : For a file without phdrs, this is zero. */
156 : GElf_Addr vaddr;
157 :
158 : /* This is an address chosen for synchronization between the main file
159 : and the debug file. See dwfl_module_getdwarf.c for how it's chosen. */
160 : GElf_Addr address_sync;
161 : };
162 :
163 : struct Dwfl_Module
164 : {
165 : Dwfl *dwfl;
166 : struct Dwfl_Module *next; /* Link on Dwfl.modulelist. */
167 :
168 : void *userdata;
169 :
170 : char *name; /* Iterator name for this module. */
171 : GElf_Addr low_addr, high_addr;
172 :
173 : struct dwfl_file main, debug, aux_sym;
174 : GElf_Addr main_bias;
175 : Ebl *ebl;
176 : GElf_Half e_type; /* GElf_Ehdr.e_type cache. */
177 : Dwfl_Error elferr; /* Previous failure to open main file. */
178 :
179 : struct dwfl_relocation *reloc_info; /* Relocatable sections. */
180 :
181 : struct dwfl_file *symfile; /* Either main or debug. */
182 : Elf_Data *symdata; /* Data in the ELF symbol table section. */
183 : Elf_Data *aux_symdata; /* Data in the auxiliary ELF symbol table. */
184 : size_t syments; /* sh_size / sh_entsize of that section. */
185 : size_t aux_syments; /* sh_size / sh_entsize of aux_sym section. */
186 : int first_global; /* Index of first global symbol of table. */
187 : int aux_first_global; /* Index of first global of aux_sym table. */
188 : Elf_Data *symstrdata; /* Data for its string table. */
189 : Elf_Data *aux_symstrdata; /* Data for aux_sym string table. */
190 : Elf_Data *symxndxdata; /* Data in the extended section index table. */
191 : Elf_Data *aux_symxndxdata; /* Data in the extended auxiliary table. */
192 :
193 : char *elfdir; /* The dir where we found the main Elf. */
194 :
195 : Dwarf *dw; /* libdw handle for its debugging info. */
196 : Dwarf *alt; /* Dwarf used for dwarf_setalt, or NULL. */
197 : int alt_fd; /* descriptor, only valid when alt != NULL. */
198 : Elf *alt_elf; /* Elf for alt Dwarf. */
199 :
200 : Dwfl_Error symerr; /* Previous failure to load symbols. */
201 : Dwfl_Error dwerr; /* Previous failure to load DWARF. */
202 :
203 : /* Known CU's in this module. */
204 : struct dwfl_cu *first_cu, **cu;
205 :
206 : void *lazy_cu_root; /* Table indexed by Dwarf_Off of CU. */
207 :
208 : struct dwfl_arange *aranges; /* Mapping of addresses in module to CUs. */
209 :
210 : void *build_id_bits; /* malloc'd copy of build ID bits. */
211 : GElf_Addr build_id_vaddr; /* Address where they reside, 0 if unknown. */
212 : int build_id_len; /* -1 for prior failure, 0 if unset. */
213 :
214 : unsigned int ncu;
215 : unsigned int lazycu; /* Possible users, deleted when none left. */
216 : unsigned int naranges;
217 :
218 : Dwarf_CFI *dwarf_cfi; /* Cached DWARF CFI for this module. */
219 : Dwarf_CFI *eh_cfi; /* Cached EH CFI for this module. */
220 :
221 : int segment; /* Index of first segment table entry. */
222 : bool gc; /* Mark/sweep flag. */
223 : bool is_executable; /* Use Dwfl::executable_for_core? */
224 : };
225 :
226 : /* This holds information common for all the threads/tasks/TIDs of one process
227 : for backtraces. */
228 :
229 : struct Dwfl_Process
230 : {
231 : struct Dwfl *dwfl;
232 : pid_t pid;
233 : const Dwfl_Thread_Callbacks *callbacks;
234 : void *callbacks_arg;
235 : struct ebl *ebl;
236 : bool ebl_close:1;
237 : };
238 :
239 : /* See its typedef in libdwfl.h. */
240 :
241 : struct Dwfl_Thread
242 : {
243 : Dwfl_Process *process;
244 : pid_t tid;
245 : /* The current frame being unwound. Initially it is the bottom frame.
246 : Later the processed frames get freed and this pointer is updated. */
247 : Dwfl_Frame *unwound;
248 : void *callbacks_arg;
249 : };
250 :
251 : /* See its typedef in libdwfl.h. */
252 :
253 : struct Dwfl_Frame
254 : {
255 : Dwfl_Thread *thread;
256 : /* Previous (outer) frame. */
257 : Dwfl_Frame *unwound;
258 : bool signal_frame : 1;
259 : bool initial_frame : 1;
260 : enum
261 : {
262 : /* This structure is still being initialized or there was an error
263 : initializing it. */
264 : DWFL_FRAME_STATE_ERROR,
265 : /* PC field is valid. */
266 : DWFL_FRAME_STATE_PC_SET,
267 : /* PC field is undefined, this means the next (inner) frame was the
268 : outermost frame. */
269 : DWFL_FRAME_STATE_PC_UNDEFINED
270 : } pc_state;
271 : /* Either initialized from appropriate REGS element or on some archs
272 : initialized separately as the return address has no DWARF register. */
273 : Dwarf_Addr pc;
274 : /* (1 << X) bitmask where 0 <= X < ebl_frame_nregs. */
275 : uint64_t regs_set[3];
276 : /* REGS array size is ebl_frame_nregs.
277 : REGS_SET tells which of the REGS are valid. */
278 : Dwarf_Addr regs[];
279 : };
280 :
281 : /* Fetch value from Dwfl_Frame->regs indexed by DWARF REGNO.
282 : No error code is set if the function returns FALSE. */
283 : bool __libdwfl_frame_reg_get (Dwfl_Frame *state, unsigned regno,
284 : Dwarf_Addr *val)
285 : internal_function;
286 :
287 : /* Store value to Dwfl_Frame->regs indexed by DWARF REGNO.
288 : No error code is set if the function returns FALSE. */
289 : bool __libdwfl_frame_reg_set (Dwfl_Frame *state, unsigned regno,
290 : Dwarf_Addr val)
291 : internal_function;
292 :
293 : /* Information cached about each CU in Dwfl_Module.dw. */
294 : struct dwfl_cu
295 : {
296 : /* This caches libdw information about the CU. It's also the
297 : address passed back to users, so we take advantage of the
298 : fact that it's placed first to cast back. */
299 : Dwarf_Die die;
300 :
301 : Dwfl_Module *mod; /* Pointer back to containing module. */
302 :
303 : struct dwfl_cu *next; /* CU immediately following in the file. */
304 :
305 : struct Dwfl_Lines *lines;
306 : };
307 :
308 : struct Dwfl_Lines
309 : {
310 : struct dwfl_cu *cu;
311 :
312 : /* This is what the opaque Dwfl_Line * pointers we pass to users are.
313 : We need to recover pointers to our struct dwfl_cu and a record in
314 : libdw's Dwarf_Line table. To minimize the memory used in addition
315 : to libdw's Dwarf_Lines buffer, we just point to our own index in
316 : this table, and have one pointer back to the CU. The indices here
317 : match those in libdw's Dwarf_CU.lines->info table. */
318 : struct Dwfl_Line
319 : {
320 : unsigned int idx; /* My index in the dwfl_cu.lines table. */
321 : } idx[0];
322 : };
323 :
324 : static inline struct dwfl_cu *
325 : dwfl_linecu_inline (const Dwfl_Line *line)
326 : {
327 378520 : const struct Dwfl_Lines *lines = ((const void *) line
328 377880 : - offsetof (struct Dwfl_Lines,
329 : idx[line->idx]));
330 377880 : return lines->cu;
331 : }
332 : #define dwfl_linecu dwfl_linecu_inline
333 :
334 : static inline GElf_Addr
335 : dwfl_adjusted_address (Dwfl_Module *mod, GElf_Addr addr)
336 : {
337 662730228 : return addr + mod->main_bias;
338 : }
339 :
340 : static inline GElf_Addr
341 : dwfl_deadjust_address (Dwfl_Module *mod, GElf_Addr addr)
342 : {
343 26167 : return addr - mod->main_bias;
344 : }
345 :
346 : static inline Dwarf_Addr
347 : dwfl_adjusted_dwarf_addr (Dwfl_Module *mod, Dwarf_Addr addr)
348 : {
349 520922 : return dwfl_adjusted_address (mod, (addr
350 260461 : - mod->debug.address_sync
351 260461 : + mod->main.address_sync));
352 : }
353 :
354 : static inline Dwarf_Addr
355 : dwfl_deadjust_dwarf_addr (Dwfl_Module *mod, Dwarf_Addr addr)
356 : {
357 690 : return (dwfl_deadjust_address (mod, addr)
358 345 : - mod->main.address_sync
359 345 : + mod->debug.address_sync);
360 : }
361 :
362 : static inline Dwarf_Addr
363 : dwfl_adjusted_aux_sym_addr (Dwfl_Module *mod, Dwarf_Addr addr)
364 : {
365 4326 : return dwfl_adjusted_address (mod, (addr
366 2163 : - mod->aux_sym.address_sync
367 2163 : + mod->main.address_sync));
368 : }
369 :
370 : static inline Dwarf_Addr
371 : dwfl_deadjust_aux_sym_addr (Dwfl_Module *mod, Dwarf_Addr addr)
372 : {
373 0 : return (dwfl_deadjust_address (mod, addr)
374 0 : - mod->main.address_sync
375 0 : + mod->aux_sym.address_sync);
376 : }
377 :
378 : static inline GElf_Addr
379 : dwfl_adjusted_st_value (Dwfl_Module *mod, Elf *symelf, GElf_Addr addr)
380 : {
381 654842701 : if (symelf == mod->main.elf)
382 1309621062 : return dwfl_adjusted_address (mod, addr);
383 57798 : if (symelf == mod->debug.elf)
384 55635 : return dwfl_adjusted_dwarf_addr (mod, addr);
385 2163 : return dwfl_adjusted_aux_sym_addr (mod, addr);
386 : }
387 :
388 : static inline GElf_Addr
389 : dwfl_deadjust_st_value (Dwfl_Module *mod, Elf *symelf, GElf_Addr addr)
390 : {
391 0 : if (symelf == mod->main.elf)
392 51644 : return dwfl_deadjust_address (mod, addr);
393 0 : if (symelf == mod->debug.elf)
394 0 : return dwfl_deadjust_dwarf_addr (mod, addr);
395 0 : return dwfl_deadjust_aux_sym_addr (mod, addr);
396 : }
397 :
398 : /* This describes a contiguous address range that lies in a single CU.
399 : We condense runs of Dwarf_Arange entries for the same CU into this. */
400 : struct dwfl_arange
401 : {
402 : struct dwfl_cu *cu;
403 : size_t arange; /* Index in Dwarf_Aranges. */
404 : };
405 :
406 : #define __LIBDWFL_REMOTE_MEM_CACHE_SIZE 4096
407 : /* Structure for caching remote memory reads as used by __libdwfl_pid_arg. */
408 : struct __libdwfl_remote_mem_cache
409 : {
410 : Dwarf_Addr addr; /* Remote address. */
411 : Dwarf_Off len; /* Zero if cleared, otherwise likely 4K. */
412 : unsigned char buf[__LIBDWFL_REMOTE_MEM_CACHE_SIZE]; /* The actual cache. */
413 : };
414 :
415 : /* Structure used for keeping track of ptrace attaching a thread.
416 : Shared by linux-pid-attach and linux-proc-maps. If it has been setup
417 : then get the instance through __libdwfl_get_pid_arg. */
418 : struct __libdwfl_pid_arg
419 : {
420 : /* /proc/PID/task/. */
421 : DIR *dir;
422 : /* Elf for /proc/PID/exe. Set to NULL if it couldn't be opened. */
423 : Elf *elf;
424 : /* Remote memory cache, NULL if there is no memory cached.
425 : Should be cleared on detachment (because that makes the thread
426 : runnable and the cache invalid). */
427 : struct __libdwfl_remote_mem_cache *mem_cache;
428 : /* fd for /proc/PID/exe. Set to -1 if it couldn't be opened. */
429 : int elf_fd;
430 : /* It is 0 if not used. */
431 : pid_t tid_attached;
432 : /* Valid only if TID_ATTACHED is not zero. */
433 : bool tid_was_stopped;
434 : /* True if threads are ptrace stopped by caller. */
435 : bool assume_ptrace_stopped;
436 : };
437 :
438 : /* If DWfl is not NULL and a Dwfl_Process has been setup that has
439 : Dwfl_Thread_Callbacks set to pid_thread_callbacks, then return the
440 : callbacks_arg, which will be a struct __libdwfl_pid_arg. Otherwise
441 : returns NULL. */
442 : extern struct __libdwfl_pid_arg *__libdwfl_get_pid_arg (Dwfl *dwfl)
443 : internal_function;
444 :
445 : /* Makes sure the given tid is attached. On success returns true and
446 : sets tid_was_stopped. */
447 : extern bool __libdwfl_ptrace_attach (pid_t tid, bool *tid_was_stoppedp)
448 : internal_function;
449 :
450 : /* Detaches a tid that was attached through
451 : __libdwfl_ptrace_attach. Must be given the tid_was_stopped as set
452 : by __libdwfl_ptrace_attach. */
453 : extern void __libdwfl_ptrace_detach (pid_t tid, bool tid_was_stopped)
454 : internal_function;
455 :
456 :
457 : /* Internal wrapper for old dwfl_module_getsym and new dwfl_module_getsym_info.
458 : adjust_st_value set to true returns adjusted SYM st_value, set to false
459 : it will not adjust SYM at all, but does match against resolved *ADDR. */
460 : extern const char *__libdwfl_getsym (Dwfl_Module *mod, int ndx, GElf_Sym *sym,
461 : GElf_Addr *addr, GElf_Word *shndxp,
462 : Elf **elfp, Dwarf_Addr *biasp,
463 : bool *resolved, bool adjust_st_value)
464 : internal_function;
465 :
466 : extern void __libdwfl_module_free (Dwfl_Module *mod) internal_function;
467 :
468 : /* Find the main ELF file, update MOD->elferr and/or MOD->main.elf. */
469 : extern void __libdwfl_getelf (Dwfl_Module *mod) internal_function;
470 :
471 : /* Process relocations in debugging sections in an ET_REL file.
472 : FILE must be opened with ELF_C_READ_MMAP_PRIVATE or ELF_C_READ,
473 : to make it possible to relocate the data in place (or ELF_C_RDWR or
474 : ELF_C_RDWR_MMAP if you intend to modify the Elf file on disk). After
475 : this, dwarf_begin_elf on FILE will read the relocated data.
476 :
477 : When DEBUG is false, apply partial relocation to all sections. */
478 : extern Dwfl_Error __libdwfl_relocate (Dwfl_Module *mod, Elf *file, bool debug)
479 : internal_function;
480 :
481 : /* Find the section index in mod->main.elf that contains the given
482 : *ADDR. Adjusts *ADDR to be section relative on success, returns
483 : SHN_UNDEF on failure. */
484 : extern size_t __libdwfl_find_section_ndx (Dwfl_Module *mod, Dwarf_Addr *addr)
485 : internal_function;
486 :
487 : /* Process (simple) relocations in arbitrary section TSCN of an ET_REL file.
488 : RELOCSCN is SHT_REL or SHT_RELA and TSCN is its sh_info target section. */
489 : extern Dwfl_Error __libdwfl_relocate_section (Dwfl_Module *mod, Elf *relocated,
490 : Elf_Scn *relocscn, Elf_Scn *tscn,
491 : bool partial)
492 : internal_function;
493 :
494 : /* Adjust *VALUE from section-relative to absolute.
495 : MOD->dwfl->callbacks->section_address is called to determine the actual
496 : address of a loaded section. */
497 : extern Dwfl_Error __libdwfl_relocate_value (Dwfl_Module *mod, Elf *elf,
498 : size_t *shstrndx_cache,
499 : Elf32_Word shndx,
500 : GElf_Addr *value)
501 : internal_function;
502 :
503 : /* Ensure that MOD->ebl is set up. */
504 : extern Dwfl_Error __libdwfl_module_getebl (Dwfl_Module *mod) internal_function;
505 :
506 : /* Install a new Dwarf_CFI in *SLOT (MOD->eh_cfi or MOD->dwarf_cfi). */
507 : extern Dwarf_CFI *__libdwfl_set_cfi (Dwfl_Module *mod, Dwarf_CFI **slot,
508 : Dwarf_CFI *cfi)
509 : internal_function;
510 :
511 : /* Iterate through all the CU's in the module. Start by passing a null
512 : LASTCU, and then pass the last *CU returned. Success return with null
513 : *CU no more CUs. */
514 : extern Dwfl_Error __libdwfl_nextcu (Dwfl_Module *mod, struct dwfl_cu *lastcu,
515 : struct dwfl_cu **cu) internal_function;
516 :
517 : /* Find the CU by address. */
518 : extern Dwfl_Error __libdwfl_addrcu (Dwfl_Module *mod, Dwarf_Addr addr,
519 : struct dwfl_cu **cu) internal_function;
520 :
521 : /* Ensure that CU->lines (and CU->cu->lines) is set up. */
522 : extern Dwfl_Error __libdwfl_cu_getsrclines (struct dwfl_cu *cu)
523 : internal_function;
524 :
525 : /* Look in ELF for an NT_GNU_BUILD_ID note. Store it to BUILD_ID_BITS,
526 : its vaddr in ELF to BUILD_ID_VADDR (it is unrelocated, even if MOD is not
527 : NULL) and store length to BUILD_ID_LEN. Returns -1 for errors, 1 if it was
528 : stored and 0 if no note is found. MOD may be NULL, MOD must be non-NULL
529 : only if ELF is ET_REL. */
530 : extern int __libdwfl_find_elf_build_id (Dwfl_Module *mod, Elf *elf,
531 : const void **build_id_bits,
532 : GElf_Addr *build_id_elfaddr,
533 : int *build_id_len)
534 : internal_function;
535 :
536 : /* Look in ELF for an NT_GNU_BUILD_ID note. If SET is true, store it
537 : in MOD and return its length. If SET is false, instead compare it
538 : to that stored in MOD and return 2 if they match, 1 if they do not.
539 : Returns -1 for errors, 0 if no note is found. */
540 : extern int __libdwfl_find_build_id (Dwfl_Module *mod, bool set, Elf *elf)
541 : internal_function;
542 :
543 : /* Open a main or debuginfo file by its build ID, returns the fd. */
544 : extern int __libdwfl_open_mod_by_build_id (Dwfl_Module *mod, bool debug,
545 : char **file_name) internal_function;
546 :
547 : /* Same, but takes an explicit build_id, can also be used for alt debug. */
548 : extern int __libdwfl_open_by_build_id (Dwfl_Module *mod, bool debug,
549 : char **file_name, const size_t id_len,
550 : const uint8_t *id) internal_function;
551 :
552 : extern uint32_t __libdwfl_crc32 (uint32_t crc, unsigned char *buf, size_t len)
553 : attribute_hidden;
554 : extern int __libdwfl_crc32_file (int fd, uint32_t *resp) attribute_hidden;
555 :
556 :
557 : /* Given ELF and some parameters return TRUE if the *P return value parameters
558 : have been successfully filled in. Any of the *P parameters can be NULL. */
559 : extern bool __libdwfl_elf_address_range (Elf *elf, GElf_Addr base,
560 : bool add_p_vaddr, bool sanity,
561 : GElf_Addr *vaddrp,
562 : GElf_Addr *address_syncp,
563 : GElf_Addr *startp, GElf_Addr *endp,
564 : GElf_Addr *biasp, GElf_Half *e_typep)
565 : internal_function;
566 :
567 : /* Meat of dwfl_report_elf, given elf_begin just called.
568 : Consumes ELF on success, not on failure. */
569 : extern Dwfl_Module *__libdwfl_report_elf (Dwfl *dwfl, const char *name,
570 : const char *file_name, int fd,
571 : Elf *elf, GElf_Addr base,
572 : bool add_p_vaddr, bool sanity)
573 : internal_function;
574 :
575 : /* Meat of dwfl_report_offline. */
576 : extern Dwfl_Module *__libdwfl_report_offline (Dwfl *dwfl, const char *name,
577 : const char *file_name,
578 : int fd, bool closefd,
579 : int (*predicate) (const char *,
580 : const char *))
581 : internal_function;
582 :
583 : /* Free PROCESS. Unlink and free also any structures it references. */
584 : extern void __libdwfl_process_free (Dwfl_Process *process)
585 : internal_function;
586 :
587 : /* Update STATE->unwound for the unwound frame.
588 : On error STATE->unwound == NULL
589 : or STATE->unwound->pc_state == DWFL_FRAME_STATE_ERROR;
590 : in such case dwfl_errno () is set.
591 : If STATE->unwound->pc_state == DWFL_FRAME_STATE_PC_UNDEFINED
592 : then STATE was the last valid frame. */
593 : extern void __libdwfl_frame_unwind (Dwfl_Frame *state)
594 : internal_function;
595 :
596 : /* Align segment START downwards or END upwards addresses according to DWFL. */
597 : extern GElf_Addr __libdwfl_segment_start (Dwfl *dwfl, GElf_Addr start)
598 : internal_function;
599 : extern GElf_Addr __libdwfl_segment_end (Dwfl *dwfl, GElf_Addr end)
600 : internal_function;
601 :
602 : /* Decompression wrappers: decompress whole file into memory. */
603 : extern Dwfl_Error __libdw_gunzip (int fd, off_t start_offset,
604 : void *mapped, size_t mapped_size,
605 : void **whole, size_t *whole_size)
606 : internal_function;
607 : extern Dwfl_Error __libdw_bunzip2 (int fd, off_t start_offset,
608 : void *mapped, size_t mapped_size,
609 : void **whole, size_t *whole_size)
610 : internal_function;
611 : extern Dwfl_Error __libdw_unlzma (int fd, off_t start_offset,
612 : void *mapped, size_t mapped_size,
613 : void **whole, size_t *whole_size)
614 : internal_function;
615 :
616 : /* Skip the image header before a file image: updates *START_OFFSET. */
617 : extern Dwfl_Error __libdw_image_header (int fd, off_t *start_offset,
618 : void *mapped, size_t mapped_size)
619 : internal_function;
620 :
621 : /* Open Elf handle on *FDP. This handles decompression and checks
622 : elf_kind. Succeed only for ELF_K_ELF, or also ELF_K_AR if ARCHIVE_OK.
623 : Returns DWFL_E_NOERROR and sets *ELFP on success, resets *FDP to -1 if
624 : it's no longer used. Resets *FDP on failure too iff CLOSE_ON_FAIL. */
625 : extern Dwfl_Error __libdw_open_file (int *fdp, Elf **elfp,
626 : bool close_on_fail, bool archive_ok)
627 : internal_function;
628 :
629 : /* Same as __libdw_open_file, but never closes the given file
630 : descriptor and ELF_K_AR is always an acceptable type. */
631 : extern Dwfl_Error __libdw_open_elf (int fd, Elf **elfp) internal_function;
632 :
633 : /* Fetch PT_DYNAMIC P_VADDR from ELF and store it to *VADDRP. Return success.
634 : *VADDRP is not modified if the function fails. */
635 : extern bool __libdwfl_dynamic_vaddr_get (Elf *elf, GElf_Addr *vaddrp)
636 : internal_function;
637 :
638 : /* These are working nicely for --core, but are not ready to be
639 : exported interfaces quite yet. */
640 :
641 : /* Type of callback function ...
642 : */
643 : typedef bool Dwfl_Memory_Callback (Dwfl *dwfl, int segndx,
644 : void **buffer, size_t *buffer_available,
645 : GElf_Addr vaddr, size_t minread, void *arg);
646 :
647 : /* Type of callback function ...
648 : */
649 : typedef bool Dwfl_Module_Callback (Dwfl_Module *mod, void **userdata,
650 : const char *name, Dwarf_Addr base,
651 : void **buffer, size_t *buffer_available,
652 : GElf_Off cost, GElf_Off worthwhile,
653 : GElf_Off whole, GElf_Off contiguous,
654 : void *arg, Elf **elfp);
655 :
656 : /* One shared library (or executable) info from DT_DEBUG link map. */
657 : struct r_debug_info_module
658 : {
659 : struct r_debug_info_module *next;
660 : /* FD is -1 iff ELF is NULL. */
661 : int fd;
662 : Elf *elf;
663 : GElf_Addr l_ld;
664 : /* START and END are both zero if not valid. */
665 : GElf_Addr start, end;
666 : bool disk_file_has_build_id;
667 : char name[0];
668 : };
669 :
670 : /* Information gathered from DT_DEBUG by dwfl_link_map_report hinted to
671 : dwfl_segment_report_module. */
672 : struct r_debug_info
673 : {
674 : struct r_debug_info_module *module;
675 : };
676 :
677 : /* ...
678 : */
679 : extern int dwfl_segment_report_module (Dwfl *dwfl, int ndx, const char *name,
680 : Dwfl_Memory_Callback *memory_callback,
681 : void *memory_callback_arg,
682 : Dwfl_Module_Callback *read_eagerly,
683 : void *read_eagerly_arg,
684 : const void *note_file,
685 : size_t note_file_size,
686 : const struct r_debug_info *r_debug_info);
687 :
688 : /* Report a module for entry in the dynamic linker's struct link_map list.
689 : For each link_map entry, if an existing module resides at its address,
690 : this just modifies that module's name and suggested file name. If
691 : no such module exists, this calls dwfl_report_elf on the l_name string.
692 :
693 : If AUXV is not null, it points to AUXV_SIZE bytes of auxiliary vector
694 : data as contained in an NT_AUXV note or read from a /proc/pid/auxv
695 : file. When this is available, it guides the search. If AUXV is null
696 : or the memory it points to is not accessible, then this search can
697 : only find where to begin if the correct executable file was
698 : previously reported and preloaded as with dwfl_report_elf.
699 :
700 : Fill in R_DEBUG_INFO if it is not NULL. It should be cleared by the
701 : caller, this function does not touch fields it does not need to modify.
702 : If R_DEBUG_INFO is not NULL then no modules get added to DWFL, caller
703 : has to add them from filled in R_DEBUG_INFO.
704 :
705 : Returns the number of modules found, or -1 for errors. */
706 : extern int dwfl_link_map_report (Dwfl *dwfl, const void *auxv, size_t auxv_size,
707 : Dwfl_Memory_Callback *memory_callback,
708 : void *memory_callback_arg,
709 : struct r_debug_info *r_debug_info);
710 :
711 :
712 : /* Avoid PLT entries. */
713 : INTDECL (dwfl_begin)
714 : INTDECL (dwfl_errmsg)
715 : INTDECL (dwfl_errno)
716 : INTDECL (dwfl_addrmodule)
717 : INTDECL (dwfl_addrsegment)
718 : INTDECL (dwfl_addrdwarf)
719 : INTDECL (dwfl_addrdie)
720 : INTDECL (dwfl_core_file_attach)
721 : INTDECL (dwfl_core_file_report)
722 : INTDECL (dwfl_getmodules)
723 : INTDECL (dwfl_module_addrdie)
724 : INTDECL (dwfl_module_address_section)
725 : INTDECL (dwfl_module_addrinfo)
726 : INTDECL (dwfl_module_addrsym)
727 : INTDECL (dwfl_module_build_id)
728 : INTDECL (dwfl_module_getdwarf)
729 : INTDECL (dwfl_module_getelf)
730 : INTDECL (dwfl_module_getsym)
731 : INTDECL (dwfl_module_getsym_info)
732 : INTDECL (dwfl_module_getsymtab)
733 : INTDECL (dwfl_module_getsymtab_first_global)
734 : INTDECL (dwfl_module_getsrc)
735 : INTDECL (dwfl_module_report_build_id)
736 : INTDECL (dwfl_report_elf)
737 : INTDECL (dwfl_report_begin)
738 : INTDECL (dwfl_report_begin_add)
739 : INTDECL (dwfl_report_module)
740 : INTDECL (dwfl_report_segment)
741 : INTDECL (dwfl_report_offline)
742 : INTDECL (dwfl_report_end)
743 : INTDECL (dwfl_build_id_find_elf)
744 : INTDECL (dwfl_build_id_find_debuginfo)
745 : INTDECL (dwfl_standard_find_debuginfo)
746 : INTDECL (dwfl_link_map_report)
747 : INTDECL (dwfl_linux_kernel_find_elf)
748 : INTDECL (dwfl_linux_kernel_module_section_address)
749 : INTDECL (dwfl_linux_proc_attach)
750 : INTDECL (dwfl_linux_proc_report)
751 : INTDECL (dwfl_linux_proc_maps_report)
752 : INTDECL (dwfl_linux_proc_find_elf)
753 : INTDECL (dwfl_linux_kernel_report_kernel)
754 : INTDECL (dwfl_linux_kernel_report_modules)
755 : INTDECL (dwfl_linux_kernel_report_offline)
756 : INTDECL (dwfl_offline_section_address)
757 : INTDECL (dwfl_module_relocate_address)
758 : INTDECL (dwfl_module_dwarf_cfi)
759 : INTDECL (dwfl_module_eh_cfi)
760 : INTDECL (dwfl_attach_state)
761 : INTDECL (dwfl_pid)
762 : INTDECL (dwfl_thread_dwfl)
763 : INTDECL (dwfl_thread_tid)
764 : INTDECL (dwfl_frame_thread)
765 : INTDECL (dwfl_thread_state_registers)
766 : INTDECL (dwfl_thread_state_register_pc)
767 : INTDECL (dwfl_getthread_frames)
768 : INTDECL (dwfl_getthreads)
769 : INTDECL (dwfl_thread_getframes)
770 : INTDECL (dwfl_frame_pc)
771 :
772 : /* Leading arguments standard to callbacks passed a Dwfl_Module. */
773 : #define MODCB_ARGS(mod) (mod), &(mod)->userdata, (mod)->name, (mod)->low_addr
774 : #define CBFAIL (errno ? DWFL_E (ERRNO, errno) : DWFL_E_CB);
775 :
776 :
777 : /* The default used by dwfl_standard_find_debuginfo. */
778 : #define DEFAULT_DEBUGINFO_PATH ":.debug:/usr/lib/debug"
779 :
780 :
781 : #endif /* libdwflP.h */
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