Commit | Line | Data |
---|---|---|
b5a8598f | 1 | /* |
dae52e76 | 2 | * bin-info.c |
b5a8598f AB |
3 | * |
4 | * Babeltrace - Executable and Shared Object Debug Info Reader | |
5 | * | |
6 | * Copyright 2015 Antoine Busque <abusque@efficios.com> | |
7 | * | |
8 | * Author: Antoine Busque <abusque@efficios.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
26 | * SOFTWARE. | |
27 | */ | |
28 | ||
29 | #include <fcntl.h> | |
30 | #include <math.h> | |
31 | #include <libgen.h> | |
32 | #include <stdio.h> | |
33 | #include <inttypes.h> | |
34 | #include <stdlib.h> | |
35 | #include <string.h> | |
36 | #include <unistd.h> | |
37 | #include <dwarf.h> | |
38 | #include <glib.h> | |
39 | #include <babeltrace/dwarf.h> | |
dae52e76 | 40 | #include <babeltrace/bin-info.h> |
b5a8598f AB |
41 | #include <babeltrace/crc32.h> |
42 | #include <babeltrace/babeltrace-internal.h> | |
beef86dc | 43 | #include <babeltrace/utils.h> |
b5a8598f AB |
44 | |
45 | /* | |
46 | * An address printed in hex is at most 20 bytes (16 for 64-bits + | |
47 | * leading 0x + optional leading '+' if addr is an offset + null | |
48 | * character). | |
49 | */ | |
50 | #define ADDR_STR_LEN 20 | |
51 | ||
52 | BT_HIDDEN | |
dae52e76 | 53 | int bin_info_init(void) |
b5a8598f AB |
54 | { |
55 | int ret = 0; | |
56 | ||
57 | if (elf_version(EV_CURRENT) == EV_NONE) { | |
1036949d AB |
58 | printf_debug("ELF library initialization failed: %s\n", |
59 | elf_errmsg(-1)); | |
b5a8598f AB |
60 | ret = -1; |
61 | } | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | BT_HIDDEN | |
dae52e76 | 67 | struct bin_info *bin_info_create(const char *path, uint64_t low_addr, |
1a4a1345 | 68 | uint64_t memsz, bool is_pic) |
b5a8598f | 69 | { |
dae52e76 | 70 | struct bin_info *bin = NULL; |
b5a8598f AB |
71 | |
72 | if (!path) { | |
73 | goto error; | |
74 | } | |
75 | ||
dae52e76 AB |
76 | bin = g_new0(struct bin_info, 1); |
77 | if (!bin) { | |
b5a8598f AB |
78 | goto error; |
79 | } | |
80 | ||
b7b61ced | 81 | if (opt_debug_info_target_prefix) { |
dae52e76 | 82 | bin->elf_path = g_build_path("/", opt_debug_info_target_prefix, |
b7b61ced AB |
83 | path, NULL); |
84 | } else { | |
dae52e76 | 85 | bin->elf_path = strdup(path); |
b7b61ced AB |
86 | } |
87 | ||
dae52e76 | 88 | if (!bin->elf_path) { |
b5a8598f AB |
89 | goto error; |
90 | } | |
91 | ||
dae52e76 AB |
92 | bin->is_pic = is_pic; |
93 | bin->memsz = memsz; | |
94 | bin->low_addr = low_addr; | |
95 | bin->high_addr = bin->low_addr + bin->memsz; | |
b5a8598f | 96 | |
dae52e76 | 97 | return bin; |
b5a8598f AB |
98 | |
99 | error: | |
dae52e76 | 100 | bin_info_destroy(bin); |
b5a8598f AB |
101 | return NULL; |
102 | } | |
103 | ||
104 | BT_HIDDEN | |
dae52e76 | 105 | void bin_info_destroy(struct bin_info *bin) |
b5a8598f | 106 | { |
dae52e76 | 107 | if (!bin) { |
b5a8598f AB |
108 | return; |
109 | } | |
110 | ||
dae52e76 | 111 | dwarf_end(bin->dwarf_info); |
b5a8598f | 112 | |
dae52e76 AB |
113 | free(bin->elf_path); |
114 | free(bin->dwarf_path); | |
115 | free(bin->build_id); | |
116 | free(bin->dbg_link_filename); | |
b5a8598f | 117 | |
dae52e76 | 118 | elf_end(bin->elf_file); |
b5a8598f | 119 | |
dae52e76 AB |
120 | close(bin->elf_fd); |
121 | close(bin->dwarf_fd); | |
b5a8598f | 122 | |
dae52e76 | 123 | g_free(bin); |
b5a8598f AB |
124 | } |
125 | ||
b8652b58 | 126 | |
b5a8598f | 127 | BT_HIDDEN |
dae52e76 | 128 | int bin_info_set_build_id(struct bin_info *bin, uint8_t *build_id, |
b5a8598f AB |
129 | size_t build_id_len) |
130 | { | |
dae52e76 | 131 | if (!bin || !build_id) { |
b5a8598f AB |
132 | goto error; |
133 | } | |
134 | ||
dae52e76 AB |
135 | bin->build_id = malloc(build_id_len); |
136 | if (!bin->build_id) { | |
b5a8598f AB |
137 | goto error; |
138 | } | |
139 | ||
dae52e76 AB |
140 | memcpy(bin->build_id, build_id, build_id_len); |
141 | bin->build_id_len = build_id_len; | |
b5a8598f AB |
142 | |
143 | /* | |
144 | * Reset the is_elf_only flag in case it had been set | |
145 | * previously, because we might find separate debug info using | |
146 | * the new build id information. | |
147 | */ | |
dae52e76 | 148 | bin->is_elf_only = false; |
b5a8598f AB |
149 | |
150 | return 0; | |
151 | ||
152 | error: | |
153 | ||
154 | return -1; | |
155 | } | |
156 | ||
157 | BT_HIDDEN | |
dae52e76 | 158 | int bin_info_set_debug_link(struct bin_info *bin, char *filename, uint32_t crc) |
b5a8598f | 159 | { |
dae52e76 | 160 | if (!bin || !filename) { |
b5a8598f AB |
161 | goto error; |
162 | } | |
163 | ||
dae52e76 AB |
164 | bin->dbg_link_filename = strdup(filename); |
165 | if (!bin->dbg_link_filename) { | |
b5a8598f AB |
166 | goto error; |
167 | } | |
168 | ||
dae52e76 | 169 | bin->dbg_link_crc = crc; |
b5a8598f AB |
170 | |
171 | /* | |
172 | * Reset the is_elf_only flag in case it had been set | |
173 | * previously, because we might find separate debug info using | |
174 | * the new build id information. | |
175 | */ | |
dae52e76 | 176 | bin->is_elf_only = false; |
b5a8598f AB |
177 | |
178 | return 0; | |
179 | ||
180 | error: | |
181 | ||
182 | return -1; | |
183 | } | |
184 | ||
185 | /** | |
186 | * Tries to read DWARF info from the location given by path, and | |
dae52e76 | 187 | * attach it to the given bin_info instance if it exists. |
b5a8598f | 188 | * |
dae52e76 | 189 | * @param bin bin_info instance for which to set DWARF info |
b5a8598f AB |
190 | * @param path Presumed location of the DWARF info |
191 | * @returns 0 on success, -1 on failure | |
192 | */ | |
193 | static | |
dae52e76 | 194 | int bin_info_set_dwarf_info_from_path(struct bin_info *bin, char *path) |
b5a8598f AB |
195 | { |
196 | int fd = -1, ret = 0; | |
197 | struct bt_dwarf_cu *cu = NULL; | |
198 | Dwarf *dwarf_info = NULL; | |
199 | ||
dae52e76 | 200 | if (!bin || !path) { |
b5a8598f AB |
201 | goto error; |
202 | } | |
203 | ||
204 | fd = open(path, O_RDONLY); | |
205 | if (fd < 0) { | |
206 | goto error; | |
207 | } | |
208 | ||
209 | dwarf_info = dwarf_begin(fd, DWARF_C_READ); | |
210 | if (!dwarf_info) { | |
211 | goto error; | |
212 | } | |
213 | ||
214 | /* | |
dae52e76 AB |
215 | * Check if the dwarf info has any CU. If not, the |
216 | * executable's object file contains no DWARF info. | |
b5a8598f AB |
217 | */ |
218 | cu = bt_dwarf_cu_create(dwarf_info); | |
219 | if (!cu) { | |
220 | goto error; | |
221 | } | |
222 | ||
223 | ret = bt_dwarf_cu_next(cu); | |
224 | if (ret) { | |
225 | goto error; | |
226 | } | |
227 | ||
dae52e76 AB |
228 | bin->dwarf_fd = fd; |
229 | bin->dwarf_path = strdup(path); | |
230 | if (!bin->dwarf_path) { | |
b5a8598f AB |
231 | goto error; |
232 | } | |
dae52e76 | 233 | bin->dwarf_info = dwarf_info; |
b5a8598f AB |
234 | free(cu); |
235 | ||
236 | return 0; | |
237 | ||
238 | error: | |
239 | close(fd); | |
240 | dwarf_end(dwarf_info); | |
241 | g_free(dwarf_info); | |
242 | free(cu); | |
243 | ||
244 | return -1; | |
245 | } | |
246 | ||
247 | /** | |
dae52e76 | 248 | * Try to set the dwarf_info for a given bin_info instance via the |
b5a8598f AB |
249 | * build ID method. |
250 | * | |
dae52e76 | 251 | * @param bin bin_info instance for which to retrieve the |
b5a8598f AB |
252 | * DWARF info via build ID |
253 | * @returns 0 on success (i.e. dwarf_info set), -1 on failure | |
254 | */ | |
255 | static | |
dae52e76 | 256 | int bin_info_set_dwarf_info_build_id(struct bin_info *bin) |
b5a8598f | 257 | { |
1b3f6ee3 | 258 | int i = 0, ret = 0; |
b5a8598f AB |
259 | char *path = NULL, *build_id_file = NULL; |
260 | const char *dbg_dir = NULL; | |
1b3f6ee3 | 261 | size_t build_id_file_len; |
b5a8598f | 262 | |
dae52e76 | 263 | if (!bin || !bin->build_id) { |
b5a8598f AB |
264 | goto error; |
265 | } | |
266 | ||
3be1e3c9 | 267 | dbg_dir = opt_debug_info_dir ? : DEFAULT_DEBUG_DIR; |
b5a8598f | 268 | |
1b3f6ee3 AB |
269 | /* 2 characters per byte printed in hex, +1 for '/' and +1 for |
270 | * '\0' */ | |
dae52e76 | 271 | build_id_file_len = (2 * bin->build_id_len) + 1 + |
1b3f6ee3 | 272 | strlen(BUILD_ID_SUFFIX) + 1; |
b5a8598f AB |
273 | build_id_file = malloc(build_id_file_len); |
274 | if (!build_id_file) { | |
275 | goto error; | |
276 | } | |
277 | ||
dae52e76 AB |
278 | snprintf(build_id_file, 4, "%02x/", bin->build_id[0]); |
279 | for (i = 1; i < bin->build_id_len; ++i) { | |
b5a8598f AB |
280 | int path_idx = 3 + 2 * (i - 1); |
281 | ||
dae52e76 | 282 | snprintf(&build_id_file[path_idx], 3, "%02x", bin->build_id[i]); |
b5a8598f | 283 | } |
1b3f6ee3 | 284 | strcat(build_id_file, BUILD_ID_SUFFIX); |
b5a8598f | 285 | |
1b3f6ee3 | 286 | path = g_build_path("/", dbg_dir, BUILD_ID_SUBDIR, build_id_file, NULL); |
b5a8598f AB |
287 | if (!path) { |
288 | goto error; | |
289 | } | |
290 | ||
dae52e76 | 291 | ret = bin_info_set_dwarf_info_from_path(bin, path); |
b5a8598f AB |
292 | if (ret) { |
293 | goto error; | |
294 | } | |
295 | ||
296 | goto end; | |
297 | ||
298 | error: | |
299 | ret = -1; | |
300 | end: | |
301 | free(build_id_file); | |
302 | free(path); | |
303 | ||
304 | return ret; | |
305 | } | |
306 | ||
307 | /** | |
308 | * Tests whether the file located at path exists and has the expected | |
309 | * checksum. | |
310 | * | |
311 | * This predicate is used when looking up separate debug info via the | |
312 | * GNU debuglink method. The expected crc can be found .gnu_debuglink | |
313 | * section in the original ELF file, along with the filename for the | |
314 | * file containing the debug info. | |
315 | * | |
316 | * @param path Full path at which to look for the debug file | |
317 | * @param crc Expected checksum for the debug file | |
318 | * @returns 1 if the file exists and has the correct checksum, | |
319 | * 0 otherwise | |
320 | */ | |
321 | static | |
322 | int is_valid_debug_file(char *path, uint32_t crc) | |
323 | { | |
324 | int ret = 0, fd = -1; | |
325 | uint32_t _crc = 0; | |
326 | ||
327 | if (!path) { | |
328 | goto end; | |
329 | } | |
330 | ||
331 | fd = open(path, O_RDONLY); | |
332 | if (fd < 0) { | |
333 | goto end; | |
334 | } | |
335 | ||
336 | ret = crc32(fd, &_crc); | |
337 | if (ret) { | |
338 | ret = 0; | |
339 | goto end; | |
340 | } | |
341 | ||
342 | ret = (crc == _crc); | |
343 | ||
344 | end: | |
345 | close(fd); | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /** | |
dae52e76 | 350 | * Try to set the dwarf_info for a given bin_info instance via the |
b5a8598f AB |
351 | * build ID method. |
352 | * | |
dae52e76 | 353 | * @param bin bin_info instance for which to retrieve the |
b5a8598f AB |
354 | * DWARF info via debug link |
355 | * @returns 0 on success (i.e. dwarf_info set), -1 on failure | |
356 | */ | |
357 | static | |
dae52e76 | 358 | int bin_info_set_dwarf_info_debug_link(struct bin_info *bin) |
b5a8598f AB |
359 | { |
360 | int ret = 0; | |
361 | const char *dbg_dir = NULL; | |
dae52e76 | 362 | char *dir_name = NULL, *bin_dir = NULL, *path = NULL; |
b5a8598f AB |
363 | size_t max_path_len = 0; |
364 | ||
dae52e76 | 365 | if (!bin || !bin->dbg_link_filename) { |
b5a8598f AB |
366 | goto error; |
367 | } | |
368 | ||
3be1e3c9 | 369 | dbg_dir = opt_debug_info_dir ? : DEFAULT_DEBUG_DIR; |
b5a8598f | 370 | |
dae52e76 | 371 | dir_name = dirname(bin->elf_path); |
b5a8598f AB |
372 | if (!dir_name) { |
373 | goto error; | |
374 | } | |
375 | ||
dae52e76 AB |
376 | /* bin_dir is just dir_name with a trailing slash */ |
377 | bin_dir = malloc(strlen(dir_name) + 2); | |
378 | if (!bin_dir) { | |
b5a8598f AB |
379 | goto error; |
380 | } | |
381 | ||
dae52e76 AB |
382 | strcpy(bin_dir, dir_name); |
383 | strcat(bin_dir, "/"); | |
b5a8598f | 384 | |
dae52e76 AB |
385 | max_path_len = strlen(dbg_dir) + strlen(bin_dir) + |
386 | strlen(DEBUG_SUBDIR) + strlen(bin->dbg_link_filename) | |
b5a8598f AB |
387 | + 1; |
388 | path = malloc(max_path_len); | |
389 | if (!path) { | |
390 | goto error; | |
391 | } | |
392 | ||
dae52e76 AB |
393 | /* First look in the executable's dir */ |
394 | strcpy(path, bin_dir); | |
395 | strcat(path, bin->dbg_link_filename); | |
b5a8598f | 396 | |
dae52e76 | 397 | if (is_valid_debug_file(path, bin->dbg_link_crc)) { |
b5a8598f AB |
398 | goto found; |
399 | } | |
400 | ||
401 | /* If not found, look in .debug subdir */ | |
dae52e76 | 402 | strcpy(path, bin_dir); |
b5a8598f | 403 | strcat(path, DEBUG_SUBDIR); |
dae52e76 | 404 | strcat(path, bin->dbg_link_filename); |
b5a8598f | 405 | |
dae52e76 | 406 | if (is_valid_debug_file(path, bin->dbg_link_crc)) { |
b5a8598f AB |
407 | goto found; |
408 | } | |
409 | ||
410 | /* Lastly, look under the global debug directory */ | |
411 | strcpy(path, dbg_dir); | |
dae52e76 AB |
412 | strcat(path, bin_dir); |
413 | strcat(path, bin->dbg_link_filename); | |
b5a8598f | 414 | |
dae52e76 | 415 | if (is_valid_debug_file(path, bin->dbg_link_crc)) { |
b5a8598f AB |
416 | goto found; |
417 | } | |
418 | ||
419 | error: | |
420 | ret = -1; | |
421 | end: | |
422 | free(path); | |
dae52e76 | 423 | free(bin_dir); |
b5a8598f AB |
424 | |
425 | return ret; | |
426 | ||
427 | found: | |
dae52e76 | 428 | ret = bin_info_set_dwarf_info_from_path(bin, path); |
b5a8598f AB |
429 | if (ret) { |
430 | goto error; | |
431 | } | |
432 | ||
433 | goto end; | |
434 | } | |
435 | ||
436 | /** | |
437 | * Initialize the DWARF info for a given executable. | |
438 | * | |
dae52e76 | 439 | * @param bin bin_info instance |
b5a8598f AB |
440 | * @returns 0 on success, -1 on failure |
441 | */ | |
442 | static | |
dae52e76 | 443 | int bin_info_set_dwarf_info(struct bin_info *bin) |
b5a8598f AB |
444 | { |
445 | int ret = 0; | |
446 | ||
dae52e76 | 447 | if (!bin) { |
b5a8598f AB |
448 | goto error; |
449 | } | |
450 | ||
451 | /* First try to set the DWARF info from the ELF file */ | |
dae52e76 | 452 | ret = bin_info_set_dwarf_info_from_path(bin, bin->elf_path); |
b5a8598f AB |
453 | if (!ret) { |
454 | goto end; | |
455 | } | |
456 | ||
457 | /* | |
458 | * If that fails, try to find separate debug info via build ID | |
459 | * and debug link. | |
460 | */ | |
dae52e76 | 461 | ret = bin_info_set_dwarf_info_build_id(bin); |
b5a8598f AB |
462 | if (!ret) { |
463 | goto end; | |
464 | } | |
465 | ||
dae52e76 | 466 | ret = bin_info_set_dwarf_info_debug_link(bin); |
b5a8598f AB |
467 | if (!ret) { |
468 | goto end; | |
469 | } | |
470 | ||
471 | error: | |
472 | ret = -1; | |
473 | end: | |
474 | return ret; | |
475 | } | |
476 | ||
b8652b58 AB |
477 | /** |
478 | * Initialize the ELF file for a given executable. | |
479 | * | |
dae52e76 | 480 | * @param bin bin_info instance |
b8652b58 AB |
481 | * @returns 0 on success, -1 on failure |
482 | */ | |
483 | static | |
dae52e76 | 484 | int bin_info_set_elf_file(struct bin_info *bin) |
b8652b58 AB |
485 | { |
486 | int elf_fd; | |
e362dc93 | 487 | Elf *elf_file = NULL; |
b8652b58 | 488 | |
dae52e76 | 489 | if (!bin) { |
b8652b58 AB |
490 | goto error; |
491 | } | |
492 | ||
dae52e76 | 493 | elf_fd = open(bin->elf_path, O_RDONLY); |
b8652b58 | 494 | if (elf_fd < 0) { |
dae52e76 | 495 | printf_verbose("Failed to open %s\n", bin->elf_path); |
b8652b58 AB |
496 | goto error; |
497 | } | |
498 | ||
499 | elf_file = elf_begin(elf_fd, ELF_C_READ, NULL); | |
500 | if (!elf_file) { | |
1036949d | 501 | printf_debug("elf_begin failed: %s\n", elf_errmsg(-1)); |
b8652b58 AB |
502 | goto error; |
503 | } | |
504 | ||
505 | if (elf_kind(elf_file) != ELF_K_ELF) { | |
1036949d | 506 | printf_verbose("Error: %s is not an ELF object\n", |
dae52e76 | 507 | bin->elf_path); |
b8652b58 AB |
508 | goto error; |
509 | } | |
510 | ||
dae52e76 AB |
511 | bin->elf_fd = elf_fd; |
512 | bin->elf_file = elf_file; | |
b8652b58 AB |
513 | return 0; |
514 | ||
515 | error: | |
516 | close(elf_fd); | |
517 | elf_end(elf_file); | |
518 | return -1; | |
519 | } | |
520 | ||
521 | ||
b5a8598f AB |
522 | BT_HIDDEN |
523 | void source_location_destroy(struct source_location *src_loc) | |
524 | { | |
525 | if (!src_loc) { | |
526 | return; | |
527 | } | |
528 | ||
529 | free(src_loc->filename); | |
530 | g_free(src_loc); | |
531 | } | |
1c47ec6c AB |
532 | /** |
533 | * Append a string representation of an address offset to an existing | |
534 | * string. | |
535 | * | |
536 | * On success, the out parameter `result` will contain the base string | |
537 | * followed by the offset string of the form "+0x1234". On failure, | |
538 | * `result` remains unchanged. | |
539 | * | |
540 | * @param base_str The string to which to append an offset string | |
541 | * @param low_addr The lower virtual memory address, the base from | |
542 | * which the offset is computed | |
543 | * @param high_addr The higher virtual memory address | |
544 | * @param result Out parameter, the base string followed by the | |
545 | * offset string | |
546 | * @returns 0 on success, -1 on failure | |
547 | */ | |
548 | static | |
dae52e76 | 549 | int bin_info_append_offset_str(const char *base_str, uint64_t low_addr, |
1c47ec6c AB |
550 | uint64_t high_addr, char **result) |
551 | { | |
552 | int ret; | |
553 | uint64_t offset; | |
554 | char *_result = NULL; | |
555 | char offset_str[ADDR_STR_LEN]; | |
556 | ||
557 | if (!base_str || !result) { | |
558 | goto error; | |
559 | } | |
560 | ||
561 | offset = high_addr - low_addr; | |
562 | ||
563 | _result = malloc(strlen(base_str) + ADDR_STR_LEN); | |
564 | if (!_result) { | |
565 | goto error; | |
566 | } | |
567 | ||
568 | ret = snprintf(offset_str, ADDR_STR_LEN, "+%#0" PRIx64, offset); | |
569 | if (ret < 0) { | |
570 | goto error; | |
571 | } | |
572 | strcpy(_result, base_str); | |
573 | strcat(_result, offset_str); | |
574 | *result = _result; | |
575 | ||
576 | return 0; | |
577 | ||
578 | error: | |
579 | free(_result); | |
580 | return -1; | |
581 | } | |
b5a8598f AB |
582 | |
583 | /** | |
584 | * Try to find the symbol closest to an address within a given ELF | |
585 | * section. | |
586 | * | |
587 | * Only function symbols are taken into account. The symbol's address | |
588 | * must precede `addr`. A symbol with a closer address might exist | |
589 | * after `addr` but is irrelevant because it cannot encompass `addr`. | |
590 | * | |
591 | * On success, if found, the out parameters `sym` and `shdr` are | |
592 | * set. On failure or if none are found, they remain unchanged. | |
593 | * | |
594 | * @param scn ELF section in which to look for the address | |
595 | * @param addr Virtual memory address for which to find the | |
596 | * nearest function symbol | |
597 | * @param sym Out parameter, the nearest function symbol | |
598 | * @param shdr Out parameter, the section header for scn | |
599 | * @returns 0 on success, -1 on failure | |
600 | */ | |
601 | static | |
dae52e76 | 602 | int bin_info_get_nearest_symbol_from_section(Elf_Scn *scn, uint64_t addr, |
b5a8598f AB |
603 | GElf_Sym **sym, GElf_Shdr **shdr) |
604 | { | |
605 | int i; | |
606 | size_t symbol_count; | |
607 | Elf_Data *data = NULL; | |
608 | GElf_Shdr *_shdr = NULL; | |
609 | GElf_Sym *nearest_sym = NULL; | |
610 | ||
611 | if (!scn || !sym || !shdr) { | |
612 | goto error; | |
613 | } | |
614 | ||
615 | _shdr = g_new0(GElf_Shdr, 1); | |
616 | if (!_shdr) { | |
617 | goto error; | |
618 | } | |
619 | ||
620 | _shdr = gelf_getshdr(scn, _shdr); | |
621 | if (!_shdr) { | |
622 | goto error; | |
623 | } | |
624 | ||
625 | if (_shdr->sh_type != SHT_SYMTAB) { | |
626 | /* | |
627 | * We are only interested in symbol table (symtab) | |
628 | * sections, skip this one. | |
629 | */ | |
630 | goto end; | |
631 | } | |
632 | ||
633 | data = elf_getdata(scn, NULL); | |
634 | if (!data) { | |
635 | goto error; | |
636 | } | |
637 | ||
638 | symbol_count = _shdr->sh_size / _shdr->sh_entsize; | |
639 | ||
640 | for (i = 0; i < symbol_count; ++i) { | |
641 | GElf_Sym *cur_sym = NULL; | |
642 | ||
643 | cur_sym = g_new0(GElf_Sym, 1); | |
644 | if (!cur_sym) { | |
645 | goto error; | |
646 | } | |
647 | cur_sym = gelf_getsym(data, i, cur_sym); | |
648 | if (!cur_sym) { | |
649 | goto error; | |
650 | } | |
651 | if (GELF_ST_TYPE(cur_sym->st_info) != STT_FUNC) { | |
652 | /* We're only interested in the functions. */ | |
653 | g_free(cur_sym); | |
654 | continue; | |
655 | } | |
656 | ||
657 | if (cur_sym->st_value <= addr && | |
658 | (!nearest_sym || | |
659 | cur_sym->st_value > nearest_sym->st_value)) { | |
660 | g_free(nearest_sym); | |
661 | nearest_sym = cur_sym; | |
662 | } else { | |
663 | g_free(cur_sym); | |
664 | } | |
665 | } | |
666 | ||
667 | end: | |
668 | if (nearest_sym) { | |
669 | *sym = nearest_sym; | |
670 | *shdr = _shdr; | |
671 | } else { | |
672 | g_free(_shdr); | |
673 | } | |
674 | ||
675 | return 0; | |
676 | ||
677 | error: | |
678 | g_free(nearest_sym); | |
679 | g_free(_shdr); | |
680 | return -1; | |
681 | } | |
682 | ||
683 | /** | |
684 | * Get the name of the function containing a given address within an | |
685 | * executable using ELF symbols. | |
686 | * | |
687 | * The function name is in fact the name of the nearest ELF symbol, | |
688 | * followed by the offset in bytes between the address and the symbol | |
689 | * (in hex), separated by a '+' character. | |
690 | * | |
691 | * If found, the out parameter `func_name` is set on success. On failure, | |
692 | * it remains unchanged. | |
693 | * | |
dae52e76 | 694 | * @param bin bin_info instance for the executable containing |
b5a8598f AB |
695 | * the address |
696 | * @param addr Virtual memory address for which to find the | |
697 | * function name | |
698 | * @param func_name Out parameter, the function name | |
699 | * @returns 0 on success, -1 on failure | |
700 | */ | |
701 | static | |
dae52e76 | 702 | int bin_info_lookup_elf_function_name(struct bin_info *bin, uint64_t addr, |
b5a8598f AB |
703 | char **func_name) |
704 | { | |
705 | /* | |
706 | * TODO (possible optimisation): if an ELF has no symtab | |
707 | * section, it has been stripped. Therefore, it would be wise | |
708 | * to store a flag indicating the stripped status after the | |
709 | * first iteration to prevent subsequent ones. | |
710 | */ | |
711 | int ret = 0; | |
712 | Elf_Scn *scn = NULL; | |
713 | GElf_Sym *sym = NULL; | |
714 | GElf_Shdr *shdr = NULL; | |
715 | char *sym_name = NULL; | |
b5a8598f | 716 | |
b8652b58 | 717 | /* Set ELF file if it hasn't been accessed yet. */ |
dae52e76 AB |
718 | if (!bin->elf_file) { |
719 | ret = bin_info_set_elf_file(bin); | |
b8652b58 AB |
720 | if (ret) { |
721 | /* Failed to set ELF file. */ | |
722 | goto error; | |
723 | } | |
724 | } | |
725 | ||
dae52e76 | 726 | scn = elf_nextscn(bin->elf_file, scn); |
b5a8598f AB |
727 | if (!scn) { |
728 | goto error; | |
729 | } | |
730 | ||
731 | while (scn && !sym) { | |
dae52e76 | 732 | ret = bin_info_get_nearest_symbol_from_section( |
b5a8598f AB |
733 | scn, addr, &sym, &shdr); |
734 | if (ret) { | |
735 | goto error; | |
736 | } | |
737 | ||
dae52e76 | 738 | scn = elf_nextscn(bin->elf_file, scn); |
b5a8598f AB |
739 | } |
740 | ||
741 | if (sym) { | |
dae52e76 | 742 | sym_name = elf_strptr(bin->elf_file, shdr->sh_link, |
b5a8598f AB |
743 | sym->st_name); |
744 | if (!sym_name) { | |
745 | goto error; | |
746 | } | |
747 | ||
dae52e76 | 748 | ret = bin_info_append_offset_str(sym_name, sym->st_value, addr, |
1c47ec6c AB |
749 | func_name); |
750 | if (ret) { | |
b5a8598f AB |
751 | goto error; |
752 | } | |
b5a8598f AB |
753 | } |
754 | ||
755 | g_free(shdr); | |
756 | g_free(sym); | |
757 | return 0; | |
758 | ||
759 | error: | |
760 | g_free(shdr); | |
761 | g_free(sym); | |
b5a8598f AB |
762 | return -1; |
763 | } | |
764 | ||
765 | /** | |
766 | * Get the name of the function containing a given address within a | |
767 | * given compile unit (CU). | |
768 | * | |
769 | * If found, the out parameter `func_name` is set on success. On | |
770 | * failure, it remains unchanged. | |
771 | * | |
772 | * @param cu bt_dwarf_cu instance which may contain the address | |
773 | * @param addr Virtual memory address for which to find the | |
774 | * function name | |
775 | * @param func_name Out parameter, the function name | |
776 | * @returns 0 on success, -1 on failure | |
777 | */ | |
778 | static | |
dae52e76 | 779 | int bin_info_lookup_cu_function_name(struct bt_dwarf_cu *cu, uint64_t addr, |
b5a8598f AB |
780 | char **func_name) |
781 | { | |
782 | int ret = 0, found = 0; | |
b5a8598f AB |
783 | struct bt_dwarf_die *die = NULL; |
784 | ||
785 | if (!cu || !func_name) { | |
786 | goto error; | |
787 | } | |
788 | ||
789 | die = bt_dwarf_die_create(cu); | |
790 | if (!die) { | |
791 | goto error; | |
792 | } | |
793 | ||
794 | while (bt_dwarf_die_next(die) == 0) { | |
795 | int tag; | |
796 | ||
797 | ret = bt_dwarf_die_get_tag(die, &tag); | |
798 | if (ret) { | |
799 | goto error; | |
800 | } | |
801 | ||
802 | if (tag == DW_TAG_subprogram) { | |
803 | ret = bt_dwarf_die_contains_addr(die, addr, &found); | |
804 | if (ret) { | |
805 | goto error; | |
806 | } | |
807 | ||
808 | if (found) { | |
809 | break; | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | if (found) { | |
1c47ec6c AB |
815 | uint64_t low_addr = 0; |
816 | char *die_name = NULL; | |
817 | ||
d3c33bc6 AB |
818 | ret = bt_dwarf_die_get_name(die, &die_name); |
819 | if (ret) { | |
820 | goto error; | |
821 | } | |
822 | ||
823 | ret = dwarf_lowpc(die->dwarf_die, &low_addr); | |
b5a8598f AB |
824 | if (ret) { |
825 | goto error; | |
826 | } | |
827 | ||
dae52e76 | 828 | ret = bin_info_append_offset_str(die_name, low_addr, addr, |
1c47ec6c AB |
829 | func_name); |
830 | if (ret) { | |
d3c33bc6 AB |
831 | goto error; |
832 | } | |
b5a8598f AB |
833 | } |
834 | ||
835 | bt_dwarf_die_destroy(die); | |
836 | return 0; | |
837 | ||
838 | error: | |
839 | bt_dwarf_die_destroy(die); | |
840 | return -1; | |
841 | } | |
842 | ||
843 | /** | |
844 | * Get the name of the function containing a given address within an | |
845 | * executable using DWARF debug info. | |
846 | * | |
847 | * If found, the out parameter `func_name` is set on success. On | |
848 | * failure, it remains unchanged. | |
849 | * | |
dae52e76 | 850 | * @param bin bin_info instance for the executable containing |
b5a8598f AB |
851 | * the address |
852 | * @param addr Virtual memory address for which to find the | |
853 | * function name | |
854 | * @param func_name Out parameter, the function name | |
855 | * @returns 0 on success, -1 on failure | |
856 | */ | |
857 | static | |
dae52e76 | 858 | int bin_info_lookup_dwarf_function_name(struct bin_info *bin, uint64_t addr, |
b5a8598f AB |
859 | char **func_name) |
860 | { | |
861 | int ret = 0; | |
862 | char *_func_name = NULL; | |
863 | struct bt_dwarf_cu *cu = NULL; | |
864 | ||
dae52e76 | 865 | if (!bin || !func_name) { |
b5a8598f AB |
866 | goto error; |
867 | } | |
868 | ||
dae52e76 | 869 | cu = bt_dwarf_cu_create(bin->dwarf_info); |
b5a8598f AB |
870 | if (!cu) { |
871 | goto error; | |
872 | } | |
873 | ||
874 | while (bt_dwarf_cu_next(cu) == 0) { | |
dae52e76 | 875 | ret = bin_info_lookup_cu_function_name(cu, addr, &_func_name); |
b5a8598f AB |
876 | if (ret) { |
877 | goto error; | |
878 | } | |
879 | ||
880 | if (_func_name) { | |
881 | break; | |
882 | } | |
883 | } | |
884 | ||
885 | if (_func_name) { | |
886 | *func_name = _func_name; | |
887 | } | |
888 | ||
889 | bt_dwarf_cu_destroy(cu); | |
890 | return 0; | |
891 | ||
892 | error: | |
893 | bt_dwarf_cu_destroy(cu); | |
894 | return -1; | |
895 | } | |
896 | ||
897 | BT_HIDDEN | |
dae52e76 | 898 | int bin_info_lookup_function_name(struct bin_info *bin, uint64_t addr, |
b5a8598f AB |
899 | char **func_name) |
900 | { | |
901 | int ret = 0; | |
902 | char *_func_name = NULL; | |
903 | ||
dae52e76 | 904 | if (!bin || !func_name) { |
b5a8598f AB |
905 | goto error; |
906 | } | |
907 | ||
908 | /* Set DWARF info if it hasn't been accessed yet. */ | |
dae52e76 AB |
909 | if (!bin->dwarf_info && !bin->is_elf_only) { |
910 | ret = bin_info_set_dwarf_info(bin); | |
b5a8598f AB |
911 | if (ret) { |
912 | /* Failed to set DWARF info, fallback to ELF. */ | |
dae52e76 | 913 | bin->is_elf_only = true; |
b5a8598f AB |
914 | } |
915 | } | |
916 | ||
dae52e76 | 917 | if (!bin_info_has_address(bin, addr)) { |
b5a8598f AB |
918 | goto error; |
919 | } | |
920 | ||
921 | /* | |
922 | * Addresses in ELF and DWARF are relative to base address for | |
923 | * PIC, so make the address argument relative too if needed. | |
924 | */ | |
dae52e76 AB |
925 | if (bin->is_pic) { |
926 | addr -= bin->low_addr; | |
dc419b6c AB |
927 | } |
928 | ||
dae52e76 AB |
929 | if (bin->is_elf_only) { |
930 | ret = bin_info_lookup_elf_function_name(bin, addr, &_func_name); | |
b5a8598f | 931 | } else { |
dae52e76 | 932 | ret = bin_info_lookup_dwarf_function_name(bin, addr, &_func_name); |
b5a8598f AB |
933 | } |
934 | ||
dc419b6c | 935 | if (ret || !_func_name) { |
b5a8598f AB |
936 | goto error; |
937 | } | |
938 | ||
dc419b6c AB |
939 | *func_name = _func_name; |
940 | return 0; | |
beef86dc | 941 | |
dc419b6c AB |
942 | error: |
943 | return -1; | |
944 | } | |
945 | ||
946 | BT_HIDDEN | |
dae52e76 | 947 | int bin_info_get_bin_loc(struct bin_info *bin, uint64_t addr, char **bin_loc) |
dc419b6c AB |
948 | { |
949 | int ret = 0; | |
950 | char *_bin_loc = NULL; | |
951 | ||
dae52e76 | 952 | if (!bin || !bin_loc) { |
dc419b6c | 953 | goto error; |
b5a8598f AB |
954 | } |
955 | ||
dae52e76 AB |
956 | if (bin->is_pic) { |
957 | addr -= bin->low_addr; | |
dc419b6c AB |
958 | ret = asprintf(&_bin_loc, "+%#0" PRIx64, addr); |
959 | } else { | |
960 | ret = asprintf(&_bin_loc, "@%#0" PRIx64, addr); | |
961 | } | |
962 | ||
963 | if (ret == -1 || !_bin_loc) { | |
964 | goto error; | |
965 | } | |
966 | ||
967 | *bin_loc = _bin_loc; | |
b5a8598f AB |
968 | return 0; |
969 | ||
970 | error: | |
971 | return -1; | |
972 | } | |
973 | ||
974 | /** | |
975 | * Predicate used to determine whether the children of a given DIE | |
976 | * contain a specific address. | |
977 | * | |
978 | * More specifically, the parameter `die` is expected to be a | |
979 | * subprogram (function) DIE, and this predicate tells whether any | |
980 | * subroutines are inlined within this function and would contain | |
981 | * `addr`. | |
982 | * | |
983 | * Do note that this function advances the position of `die`. If the | |
984 | * address is found within one of its children, `die` will be pointing | |
985 | * to that child upon returning from the function, allowing to extract | |
986 | * the information deemed necessary. | |
987 | * | |
988 | * @param die The parent DIE in whose children the address will be | |
989 | * looked for | |
990 | * @param addr The address for which to look for in the DIEs | |
991 | * @returns Returns 1 if the address was found, 0 if not | |
992 | */ | |
993 | static | |
dae52e76 | 994 | int bin_info_child_die_has_address(struct bt_dwarf_die *die, uint64_t addr) |
b5a8598f AB |
995 | { |
996 | int ret = 0, contains = 0; | |
997 | ||
998 | if (!die) { | |
999 | goto error; | |
1000 | } | |
1001 | ||
1002 | ret = bt_dwarf_die_child(die); | |
1003 | if (ret) { | |
1004 | goto error; | |
1005 | } | |
1006 | ||
1007 | do { | |
1008 | int tag; | |
1009 | ||
1010 | ret = bt_dwarf_die_get_tag(die, &tag); | |
1011 | if (ret) { | |
1012 | goto error; | |
1013 | } | |
1014 | ||
1015 | if (tag == DW_TAG_inlined_subroutine) { | |
1016 | ret = bt_dwarf_die_contains_addr(die, addr, &contains); | |
1017 | if (ret) { | |
1018 | goto error; | |
1019 | } | |
1020 | ||
1021 | if (contains) { | |
1022 | ret = 1; | |
1023 | goto end; | |
1024 | } | |
1025 | } | |
1026 | } while (bt_dwarf_die_next(die) == 0); | |
1027 | ||
1028 | end: | |
1029 | return ret; | |
1030 | ||
1031 | error: | |
1032 | ret = 0; | |
1033 | goto end; | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * Lookup the source location for a given address within a CU, making | |
1038 | * the assumption that it is contained within an inline routine in a | |
1039 | * function. | |
1040 | * | |
1041 | * @param cu bt_dwarf_cu instance in which to look for the address | |
1042 | * @param addr The address for which to look for | |
1043 | * @param src_loc Out parameter, the source location (filename and | |
1044 | * line number) for the address | |
1045 | * @returns 0 on success, -1 on failure | |
1046 | */ | |
1047 | static | |
dae52e76 | 1048 | int bin_info_lookup_cu_src_loc_inl(struct bt_dwarf_cu *cu, uint64_t addr, |
b5a8598f AB |
1049 | struct source_location **src_loc) |
1050 | { | |
1051 | int ret = 0, found = 0; | |
1052 | struct bt_dwarf_die *die = NULL; | |
1053 | struct source_location *_src_loc = NULL; | |
1054 | ||
1055 | if (!cu || !src_loc) { | |
1056 | goto error; | |
1057 | } | |
1058 | ||
1059 | die = bt_dwarf_die_create(cu); | |
1060 | if (!die) { | |
1061 | goto error; | |
1062 | } | |
1063 | ||
1064 | while (bt_dwarf_die_next(die) == 0) { | |
1065 | int tag; | |
1066 | ||
1067 | ret = bt_dwarf_die_get_tag(die, &tag); | |
1068 | if (ret) { | |
1069 | goto error; | |
1070 | } | |
1071 | ||
1072 | if (tag == DW_TAG_subprogram) { | |
1073 | int contains = 0; | |
1074 | ||
1075 | ret = bt_dwarf_die_contains_addr(die, addr, &contains); | |
1076 | if (ret) { | |
1077 | goto error; | |
1078 | } | |
1079 | ||
1080 | if (contains) { | |
1081 | /* | |
1082 | * Try to find an inlined subroutine | |
1083 | * child of this DIE containing addr. | |
1084 | */ | |
dae52e76 | 1085 | found = bin_info_child_die_has_address( |
b5a8598f AB |
1086 | die, addr); |
1087 | goto end; | |
1088 | } | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | end: | |
1093 | if (found) { | |
1094 | char *filename = NULL; | |
1095 | uint64_t line_no; | |
1096 | ||
1097 | _src_loc = g_new0(struct source_location, 1); | |
1098 | if (!_src_loc) { | |
1099 | goto error; | |
1100 | } | |
1101 | ||
1102 | ret = bt_dwarf_die_get_call_file(die, &filename); | |
1103 | if (ret) { | |
1104 | goto error; | |
1105 | } | |
1106 | ret = bt_dwarf_die_get_call_line(die, &line_no); | |
1107 | if (ret) { | |
1108 | free(filename); | |
1109 | goto error; | |
1110 | } | |
1111 | ||
1112 | _src_loc->filename = filename; | |
1113 | _src_loc->line_no = line_no; | |
1114 | *src_loc = _src_loc; | |
1115 | } | |
1116 | ||
1117 | bt_dwarf_die_destroy(die); | |
1118 | return 0; | |
1119 | ||
1120 | error: | |
1121 | source_location_destroy(_src_loc); | |
1122 | bt_dwarf_die_destroy(die); | |
1123 | return -1; | |
1124 | } | |
1125 | ||
1126 | /** | |
1127 | * Lookup the source location for a given address within a CU, | |
1128 | * assuming that it is contained within an inlined function. | |
1129 | * | |
1130 | * A source location can be found regardless of inlining status for | |
1131 | * this method, but in the case of an inlined function, the returned | |
1132 | * source location will point not to the callsite but rather to the | |
1133 | * definition site of the inline function. | |
1134 | * | |
1135 | * @param cu bt_dwarf_cu instance in which to look for the address | |
1136 | * @param addr The address for which to look for | |
1137 | * @param src_loc Out parameter, the source location (filename and | |
1138 | * line number) for the address | |
1139 | * @returns 0 on success, -1 on failure | |
1140 | */ | |
1141 | static | |
dae52e76 | 1142 | int bin_info_lookup_cu_src_loc_no_inl(struct bt_dwarf_cu *cu, uint64_t addr, |
b5a8598f AB |
1143 | struct source_location **src_loc) |
1144 | { | |
1145 | struct source_location *_src_loc = NULL; | |
1146 | struct bt_dwarf_die *die = NULL; | |
1147 | const char *filename = NULL; | |
1148 | Dwarf_Line *line = NULL; | |
1149 | Dwarf_Addr line_addr; | |
1150 | int ret, line_no; | |
1151 | ||
1152 | if (!cu || !src_loc) { | |
1153 | goto error; | |
1154 | } | |
1155 | ||
1156 | die = bt_dwarf_die_create(cu); | |
1157 | if (!die) { | |
1158 | goto error; | |
1159 | } | |
1160 | ||
1161 | line = dwarf_getsrc_die(die->dwarf_die, addr); | |
1162 | if (!line) { | |
1163 | goto error; | |
1164 | } | |
1165 | ||
1166 | ret = dwarf_lineaddr(line, &line_addr); | |
1167 | if (ret) { | |
1168 | goto error; | |
1169 | } | |
1170 | ||
1171 | filename = dwarf_linesrc(line, NULL, NULL); | |
1172 | if (!filename) { | |
1173 | goto error; | |
1174 | } | |
1175 | ||
1176 | if (addr == line_addr) { | |
1177 | _src_loc = g_new0(struct source_location, 1); | |
1178 | if (!_src_loc) { | |
1179 | goto error; | |
1180 | } | |
1181 | ||
1182 | ret = dwarf_lineno(line, &line_no); | |
1183 | if (ret) { | |
1184 | goto error; | |
1185 | } | |
1186 | ||
1187 | _src_loc->line_no = line_no; | |
1188 | _src_loc->filename = strdup(filename); | |
1189 | } | |
1190 | ||
1191 | bt_dwarf_die_destroy(die); | |
1192 | ||
1193 | if (_src_loc) { | |
1194 | *src_loc = _src_loc; | |
1195 | } | |
1196 | ||
1197 | return 0; | |
1198 | ||
1199 | error: | |
1200 | source_location_destroy(_src_loc); | |
1201 | bt_dwarf_die_destroy(die); | |
1202 | return -1; | |
1203 | } | |
1204 | ||
1205 | /** | |
1206 | * Get the source location (file name and line number) for a given | |
1207 | * address within a compile unit (CU). | |
1208 | * | |
1209 | * On success, the out parameter `src_loc` is set if found. On | |
1210 | * failure, it remains unchanged. | |
1211 | * | |
dae52e76 | 1212 | * @param cu bt_dwarf_cu instance for the compile unit which |
b5a8598f AB |
1213 | * may contain the address |
1214 | * @param addr Virtual memory address for which to find the | |
1215 | * source location | |
1216 | * @param src_loc Out parameter, the source location | |
1217 | * @returns 0 on success, -1 on failure | |
1218 | */ | |
1219 | static | |
dae52e76 | 1220 | int bin_info_lookup_cu_src_loc(struct bt_dwarf_cu *cu, uint64_t addr, |
b5a8598f AB |
1221 | struct source_location **src_loc) |
1222 | { | |
1223 | int ret = 0; | |
1224 | struct source_location *_src_loc = NULL; | |
1225 | ||
1226 | if (!cu || !src_loc) { | |
1227 | goto error; | |
1228 | } | |
1229 | ||
dae52e76 | 1230 | ret = bin_info_lookup_cu_src_loc_inl(cu, addr, &_src_loc); |
b5a8598f AB |
1231 | if (ret) { |
1232 | goto error; | |
1233 | } | |
1234 | ||
1235 | if (_src_loc) { | |
1236 | goto end; | |
1237 | } | |
1238 | ||
dae52e76 | 1239 | ret = bin_info_lookup_cu_src_loc_no_inl(cu, addr, &_src_loc); |
b5a8598f AB |
1240 | if (ret) { |
1241 | goto error; | |
1242 | } | |
1243 | ||
1244 | if (_src_loc) { | |
1245 | goto end; | |
1246 | } | |
1247 | ||
1248 | end: | |
1249 | if (_src_loc) { | |
1250 | *src_loc = _src_loc; | |
1251 | } | |
1252 | ||
1253 | return 0; | |
1254 | ||
1255 | error: | |
1256 | source_location_destroy(_src_loc); | |
1257 | return -1; | |
1258 | } | |
1259 | ||
1260 | BT_HIDDEN | |
dae52e76 | 1261 | int bin_info_lookup_source_location(struct bin_info *bin, uint64_t addr, |
b5a8598f AB |
1262 | struct source_location **src_loc) |
1263 | { | |
1264 | struct bt_dwarf_cu *cu = NULL; | |
1265 | struct source_location *_src_loc = NULL; | |
1266 | ||
dae52e76 | 1267 | if (!bin || !src_loc) { |
b5a8598f AB |
1268 | goto error; |
1269 | } | |
1270 | ||
1271 | /* Set DWARF info if it hasn't been accessed yet. */ | |
dae52e76 AB |
1272 | if (!bin->dwarf_info && !bin->is_elf_only) { |
1273 | if (bin_info_set_dwarf_info(bin)) { | |
b5a8598f | 1274 | /* Failed to set DWARF info. */ |
dae52e76 | 1275 | bin->is_elf_only = true; |
b5a8598f AB |
1276 | } |
1277 | } | |
1278 | ||
dae52e76 | 1279 | if (bin->is_elf_only) { |
b5a8598f AB |
1280 | /* We cannot lookup source location without DWARF info. */ |
1281 | goto error; | |
1282 | } | |
1283 | ||
dae52e76 | 1284 | if (!bin_info_has_address(bin, addr)) { |
b5a8598f AB |
1285 | goto error; |
1286 | } | |
1287 | ||
1288 | /* | |
1289 | * Addresses in ELF and DWARF are relative to base address for | |
1290 | * PIC, so make the address argument relative too if needed. | |
1291 | */ | |
dae52e76 AB |
1292 | if (bin->is_pic) { |
1293 | addr -= bin->low_addr; | |
b5a8598f AB |
1294 | } |
1295 | ||
dae52e76 | 1296 | cu = bt_dwarf_cu_create(bin->dwarf_info); |
b5a8598f AB |
1297 | if (!cu) { |
1298 | goto error; | |
1299 | } | |
1300 | ||
1301 | while (bt_dwarf_cu_next(cu) == 0) { | |
1302 | int ret; | |
1303 | ||
dae52e76 | 1304 | ret = bin_info_lookup_cu_src_loc(cu, addr, &_src_loc); |
b5a8598f AB |
1305 | if (ret) { |
1306 | goto error; | |
1307 | } | |
1308 | ||
1309 | if (_src_loc) { | |
1310 | break; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | bt_dwarf_cu_destroy(cu); | |
1315 | if (_src_loc) { | |
1316 | *src_loc = _src_loc; | |
1317 | } | |
1318 | ||
1319 | return 0; | |
1320 | ||
1321 | error: | |
1322 | source_location_destroy(_src_loc); | |
1323 | bt_dwarf_cu_destroy(cu); | |
1324 | return -1; | |
1325 | } |