| 1 | /* |
| 2 | * bin-info.c |
| 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> |
| 40 | #include <babeltrace/bin-info.h> |
| 41 | #include <babeltrace/crc32.h> |
| 42 | #include <babeltrace/babeltrace-internal.h> |
| 43 | #include <babeltrace/utils.h> |
| 44 | #include <errno.h> |
| 45 | |
| 46 | /* |
| 47 | * An address printed in hex is at most 20 bytes (16 for 64-bits + |
| 48 | * leading 0x + optional leading '+' if addr is an offset + null |
| 49 | * character). |
| 50 | */ |
| 51 | #define ADDR_STR_LEN 20 |
| 52 | |
| 53 | BT_HIDDEN |
| 54 | int bin_info_init(void) |
| 55 | { |
| 56 | int ret = 0; |
| 57 | |
| 58 | if (elf_version(EV_CURRENT) == EV_NONE) { |
| 59 | printf_debug("ELF library initialization failed: %s\n", |
| 60 | elf_errmsg(-1)); |
| 61 | ret = -1; |
| 62 | } |
| 63 | |
| 64 | return ret; |
| 65 | } |
| 66 | |
| 67 | BT_HIDDEN |
| 68 | struct bin_info *bin_info_create(const char *path, uint64_t low_addr, |
| 69 | uint64_t memsz, bool is_pic) |
| 70 | { |
| 71 | struct bin_info *bin = NULL; |
| 72 | |
| 73 | if (!path) { |
| 74 | goto error; |
| 75 | } |
| 76 | |
| 77 | bin = g_new0(struct bin_info, 1); |
| 78 | if (!bin) { |
| 79 | goto error; |
| 80 | } |
| 81 | |
| 82 | if (opt_debug_info_target_prefix) { |
| 83 | bin->elf_path = g_build_path("/", opt_debug_info_target_prefix, |
| 84 | path, NULL); |
| 85 | } else { |
| 86 | bin->elf_path = strdup(path); |
| 87 | } |
| 88 | |
| 89 | if (!bin->elf_path) { |
| 90 | goto error; |
| 91 | } |
| 92 | |
| 93 | bin->is_pic = is_pic; |
| 94 | bin->memsz = memsz; |
| 95 | bin->low_addr = low_addr; |
| 96 | bin->high_addr = bin->low_addr + bin->memsz; |
| 97 | |
| 98 | return bin; |
| 99 | |
| 100 | error: |
| 101 | bin_info_destroy(bin); |
| 102 | return NULL; |
| 103 | } |
| 104 | |
| 105 | BT_HIDDEN |
| 106 | void bin_info_destroy(struct bin_info *bin) |
| 107 | { |
| 108 | if (!bin) { |
| 109 | return; |
| 110 | } |
| 111 | |
| 112 | dwarf_end(bin->dwarf_info); |
| 113 | |
| 114 | free(bin->elf_path); |
| 115 | free(bin->dwarf_path); |
| 116 | free(bin->build_id); |
| 117 | free(bin->dbg_link_filename); |
| 118 | |
| 119 | elf_end(bin->elf_file); |
| 120 | |
| 121 | close(bin->elf_fd); |
| 122 | close(bin->dwarf_fd); |
| 123 | |
| 124 | g_free(bin); |
| 125 | } |
| 126 | |
| 127 | |
| 128 | BT_HIDDEN |
| 129 | int bin_info_set_build_id(struct bin_info *bin, uint8_t *build_id, |
| 130 | size_t build_id_len) |
| 131 | { |
| 132 | if (!bin || !build_id) { |
| 133 | goto error; |
| 134 | } |
| 135 | |
| 136 | bin->build_id = malloc(build_id_len); |
| 137 | if (!bin->build_id) { |
| 138 | goto error; |
| 139 | } |
| 140 | |
| 141 | memcpy(bin->build_id, build_id, build_id_len); |
| 142 | bin->build_id_len = build_id_len; |
| 143 | |
| 144 | /* |
| 145 | * Reset the is_elf_only flag in case it had been set |
| 146 | * previously, because we might find separate debug info using |
| 147 | * the new build id information. |
| 148 | */ |
| 149 | bin->is_elf_only = false; |
| 150 | |
| 151 | return 0; |
| 152 | |
| 153 | error: |
| 154 | |
| 155 | return -1; |
| 156 | } |
| 157 | |
| 158 | BT_HIDDEN |
| 159 | int bin_info_set_debug_link(struct bin_info *bin, char *filename, uint32_t crc) |
| 160 | { |
| 161 | if (!bin || !filename) { |
| 162 | goto error; |
| 163 | } |
| 164 | |
| 165 | bin->dbg_link_filename = strdup(filename); |
| 166 | if (!bin->dbg_link_filename) { |
| 167 | goto error; |
| 168 | } |
| 169 | |
| 170 | bin->dbg_link_crc = crc; |
| 171 | |
| 172 | /* |
| 173 | * Reset the is_elf_only flag in case it had been set |
| 174 | * previously, because we might find separate debug info using |
| 175 | * the new build id information. |
| 176 | */ |
| 177 | bin->is_elf_only = false; |
| 178 | |
| 179 | return 0; |
| 180 | |
| 181 | error: |
| 182 | |
| 183 | return -1; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Tries to read DWARF info from the location given by path, and |
| 188 | * attach it to the given bin_info instance if it exists. |
| 189 | * |
| 190 | * @param bin bin_info instance for which to set DWARF info |
| 191 | * @param path Presumed location of the DWARF info |
| 192 | * @returns 0 on success, negative value on failure |
| 193 | */ |
| 194 | static |
| 195 | int bin_info_set_dwarf_info_from_path(struct bin_info *bin, char *path) |
| 196 | { |
| 197 | int fd = -1, ret = 0; |
| 198 | struct bt_dwarf_cu *cu = NULL; |
| 199 | Dwarf *dwarf_info = NULL; |
| 200 | |
| 201 | if (!bin || !path) { |
| 202 | goto error; |
| 203 | } |
| 204 | |
| 205 | fd = open(path, O_RDONLY); |
| 206 | if (fd < 0) { |
| 207 | fd = -errno; |
| 208 | goto error; |
| 209 | } |
| 210 | |
| 211 | dwarf_info = dwarf_begin(fd, DWARF_C_READ); |
| 212 | if (!dwarf_info) { |
| 213 | goto error; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Check if the dwarf info has any CU. If not, the |
| 218 | * executable's object file contains no DWARF info. |
| 219 | */ |
| 220 | cu = bt_dwarf_cu_create(dwarf_info); |
| 221 | if (!cu) { |
| 222 | goto error; |
| 223 | } |
| 224 | |
| 225 | ret = bt_dwarf_cu_next(cu); |
| 226 | if (ret) { |
| 227 | goto error; |
| 228 | } |
| 229 | |
| 230 | bin->dwarf_fd = fd; |
| 231 | bin->dwarf_path = strdup(path); |
| 232 | if (!bin->dwarf_path) { |
| 233 | goto error; |
| 234 | } |
| 235 | bin->dwarf_info = dwarf_info; |
| 236 | free(cu); |
| 237 | |
| 238 | return 0; |
| 239 | |
| 240 | error: |
| 241 | if (fd >= 0) { |
| 242 | close(fd); |
| 243 | fd = -1; |
| 244 | } |
| 245 | dwarf_end(dwarf_info); |
| 246 | g_free(dwarf_info); |
| 247 | free(cu); |
| 248 | |
| 249 | return fd; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Try to set the dwarf_info for a given bin_info instance via the |
| 254 | * build ID method. |
| 255 | * |
| 256 | * @param bin bin_info instance for which to retrieve the |
| 257 | * DWARF info via build ID |
| 258 | * @returns 0 on success (i.e. dwarf_info set), -1 on failure |
| 259 | */ |
| 260 | static |
| 261 | int bin_info_set_dwarf_info_build_id(struct bin_info *bin) |
| 262 | { |
| 263 | int i = 0, ret = 0; |
| 264 | char *path = NULL, *build_id_file = NULL; |
| 265 | const char *dbg_dir = NULL; |
| 266 | size_t build_id_file_len; |
| 267 | |
| 268 | if (!bin || !bin->build_id) { |
| 269 | goto error; |
| 270 | } |
| 271 | |
| 272 | dbg_dir = opt_debug_info_dir ? : DEFAULT_DEBUG_DIR; |
| 273 | |
| 274 | /* 2 characters per byte printed in hex, +1 for '/' and +1 for '\0' */ |
| 275 | build_id_file_len = (2 * bin->build_id_len) + 1 + |
| 276 | strlen(BUILD_ID_SUFFIX) + 1; |
| 277 | build_id_file = malloc(build_id_file_len); |
| 278 | if (!build_id_file) { |
| 279 | goto error; |
| 280 | } |
| 281 | |
| 282 | snprintf(build_id_file, 4, "%02x/", bin->build_id[0]); |
| 283 | for (i = 1; i < bin->build_id_len; ++i) { |
| 284 | int path_idx = 3 + 2 * (i - 1); |
| 285 | |
| 286 | snprintf(&build_id_file[path_idx], 3, "%02x", bin->build_id[i]); |
| 287 | } |
| 288 | strcat(build_id_file, BUILD_ID_SUFFIX); |
| 289 | |
| 290 | path = g_build_path("/", dbg_dir, BUILD_ID_SUBDIR, build_id_file, NULL); |
| 291 | if (!path) { |
| 292 | goto error; |
| 293 | } |
| 294 | |
| 295 | ret = bin_info_set_dwarf_info_from_path(bin, path); |
| 296 | if (ret) { |
| 297 | goto error; |
| 298 | } |
| 299 | |
| 300 | goto end; |
| 301 | |
| 302 | error: |
| 303 | ret = -1; |
| 304 | end: |
| 305 | free(build_id_file); |
| 306 | free(path); |
| 307 | |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | /** |
| 312 | * Tests whether the file located at path exists and has the expected |
| 313 | * checksum. |
| 314 | * |
| 315 | * This predicate is used when looking up separate debug info via the |
| 316 | * GNU debuglink method. The expected crc can be found .gnu_debuglink |
| 317 | * section in the original ELF file, along with the filename for the |
| 318 | * file containing the debug info. |
| 319 | * |
| 320 | * @param path Full path at which to look for the debug file |
| 321 | * @param crc Expected checksum for the debug file |
| 322 | * @returns 1 if the file exists and has the correct checksum, |
| 323 | * 0 otherwise |
| 324 | */ |
| 325 | static |
| 326 | int is_valid_debug_file(char *path, uint32_t crc) |
| 327 | { |
| 328 | int ret = 0, fd = -1; |
| 329 | uint32_t _crc = 0; |
| 330 | |
| 331 | if (!path) { |
| 332 | goto end_noclose; |
| 333 | } |
| 334 | |
| 335 | fd = open(path, O_RDONLY); |
| 336 | if (fd < 0) { |
| 337 | goto end_noclose; |
| 338 | } |
| 339 | |
| 340 | ret = crc32(fd, &_crc); |
| 341 | if (ret) { |
| 342 | ret = 0; |
| 343 | goto end; |
| 344 | } |
| 345 | |
| 346 | ret = (crc == _crc); |
| 347 | |
| 348 | end: |
| 349 | close(fd); |
| 350 | end_noclose: |
| 351 | return ret; |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * Try to set the dwarf_info for a given bin_info instance via the |
| 356 | * build ID method. |
| 357 | * |
| 358 | * @param bin bin_info instance for which to retrieve the |
| 359 | * DWARF info via debug link |
| 360 | * @returns 0 on success (i.e. dwarf_info set), -1 on failure |
| 361 | */ |
| 362 | static |
| 363 | int bin_info_set_dwarf_info_debug_link(struct bin_info *bin) |
| 364 | { |
| 365 | int ret = 0; |
| 366 | const char *dbg_dir = NULL; |
| 367 | char *dir_name = NULL, *bin_dir = NULL, *path = NULL; |
| 368 | size_t max_path_len = 0; |
| 369 | |
| 370 | if (!bin || !bin->dbg_link_filename) { |
| 371 | goto error; |
| 372 | } |
| 373 | |
| 374 | dbg_dir = opt_debug_info_dir ? : DEFAULT_DEBUG_DIR; |
| 375 | |
| 376 | dir_name = dirname(bin->elf_path); |
| 377 | if (!dir_name) { |
| 378 | goto error; |
| 379 | } |
| 380 | |
| 381 | /* bin_dir is just dir_name with a trailing slash */ |
| 382 | bin_dir = malloc(strlen(dir_name) + 2); |
| 383 | if (!bin_dir) { |
| 384 | goto error; |
| 385 | } |
| 386 | |
| 387 | strcpy(bin_dir, dir_name); |
| 388 | strcat(bin_dir, "/"); |
| 389 | |
| 390 | max_path_len = strlen(dbg_dir) + strlen(bin_dir) + |
| 391 | strlen(DEBUG_SUBDIR) + strlen(bin->dbg_link_filename) |
| 392 | + 1; |
| 393 | path = malloc(max_path_len); |
| 394 | if (!path) { |
| 395 | goto error; |
| 396 | } |
| 397 | |
| 398 | /* First look in the executable's dir */ |
| 399 | strcpy(path, bin_dir); |
| 400 | strcat(path, bin->dbg_link_filename); |
| 401 | |
| 402 | if (is_valid_debug_file(path, bin->dbg_link_crc)) { |
| 403 | goto found; |
| 404 | } |
| 405 | |
| 406 | /* If not found, look in .debug subdir */ |
| 407 | strcpy(path, bin_dir); |
| 408 | strcat(path, DEBUG_SUBDIR); |
| 409 | strcat(path, bin->dbg_link_filename); |
| 410 | |
| 411 | if (is_valid_debug_file(path, bin->dbg_link_crc)) { |
| 412 | goto found; |
| 413 | } |
| 414 | |
| 415 | /* Lastly, look under the global debug directory */ |
| 416 | strcpy(path, dbg_dir); |
| 417 | strcat(path, bin_dir); |
| 418 | strcat(path, bin->dbg_link_filename); |
| 419 | |
| 420 | if (is_valid_debug_file(path, bin->dbg_link_crc)) { |
| 421 | goto found; |
| 422 | } |
| 423 | |
| 424 | error: |
| 425 | ret = -1; |
| 426 | end: |
| 427 | free(path); |
| 428 | free(bin_dir); |
| 429 | |
| 430 | return ret; |
| 431 | |
| 432 | found: |
| 433 | ret = bin_info_set_dwarf_info_from_path(bin, path); |
| 434 | if (ret) { |
| 435 | goto error; |
| 436 | } |
| 437 | |
| 438 | goto end; |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * Initialize the DWARF info for a given executable. |
| 443 | * |
| 444 | * @param bin bin_info instance |
| 445 | * @returns 0 on success, negative value on failure |
| 446 | */ |
| 447 | static |
| 448 | int bin_info_set_dwarf_info(struct bin_info *bin) |
| 449 | { |
| 450 | int ret = 0; |
| 451 | |
| 452 | if (!bin) { |
| 453 | ret = -1; |
| 454 | goto end; |
| 455 | } |
| 456 | |
| 457 | /* First try to set the DWARF info from the ELF file */ |
| 458 | ret = bin_info_set_dwarf_info_from_path(bin, bin->elf_path); |
| 459 | if (!ret) { |
| 460 | goto end; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * If that fails, try to find separate debug info via build ID |
| 465 | * and debug link. |
| 466 | */ |
| 467 | ret = bin_info_set_dwarf_info_build_id(bin); |
| 468 | if (!ret) { |
| 469 | goto end; |
| 470 | } |
| 471 | |
| 472 | ret = bin_info_set_dwarf_info_debug_link(bin); |
| 473 | if (!ret) { |
| 474 | goto end; |
| 475 | } |
| 476 | |
| 477 | end: |
| 478 | return ret; |
| 479 | } |
| 480 | |
| 481 | /** |
| 482 | * Initialize the ELF file for a given executable. |
| 483 | * |
| 484 | * @param bin bin_info instance |
| 485 | * @returns 0 on success, negative value on error. |
| 486 | */ |
| 487 | static |
| 488 | int bin_info_set_elf_file(struct bin_info *bin) |
| 489 | { |
| 490 | int elf_fd = -1; |
| 491 | Elf *elf_file = NULL; |
| 492 | |
| 493 | if (!bin) { |
| 494 | goto error; |
| 495 | } |
| 496 | |
| 497 | elf_fd = open(bin->elf_path, O_RDONLY); |
| 498 | if (elf_fd < 0) { |
| 499 | elf_fd = -errno; |
| 500 | printf_verbose("Failed to open %s\n", bin->elf_path); |
| 501 | goto error; |
| 502 | } |
| 503 | |
| 504 | elf_file = elf_begin(elf_fd, ELF_C_READ, NULL); |
| 505 | if (!elf_file) { |
| 506 | printf_debug("elf_begin failed: %s\n", elf_errmsg(-1)); |
| 507 | goto error; |
| 508 | } |
| 509 | |
| 510 | if (elf_kind(elf_file) != ELF_K_ELF) { |
| 511 | printf_verbose("Error: %s is not an ELF object\n", |
| 512 | bin->elf_path); |
| 513 | goto error; |
| 514 | } |
| 515 | |
| 516 | bin->elf_fd = elf_fd; |
| 517 | bin->elf_file = elf_file; |
| 518 | return 0; |
| 519 | |
| 520 | error: |
| 521 | if (elf_fd >= 0) { |
| 522 | close(elf_fd); |
| 523 | elf_fd = -1; |
| 524 | } |
| 525 | elf_end(elf_file); |
| 526 | return elf_fd; |
| 527 | } |
| 528 | |
| 529 | BT_HIDDEN |
| 530 | void source_location_destroy(struct source_location *src_loc) |
| 531 | { |
| 532 | if (!src_loc) { |
| 533 | return; |
| 534 | } |
| 535 | |
| 536 | free(src_loc->filename); |
| 537 | g_free(src_loc); |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * Append a string representation of an address offset to an existing |
| 542 | * string. |
| 543 | * |
| 544 | * On success, the out parameter `result` will contain the base string |
| 545 | * followed by the offset string of the form "+0x1234". On failure, |
| 546 | * `result` remains unchanged. |
| 547 | * |
| 548 | * @param base_str The string to which to append an offset string |
| 549 | * @param low_addr The lower virtual memory address, the base from |
| 550 | * which the offset is computed |
| 551 | * @param high_addr The higher virtual memory address |
| 552 | * @param result Out parameter, the base string followed by the |
| 553 | * offset string |
| 554 | * @returns 0 on success, -1 on failure |
| 555 | */ |
| 556 | static |
| 557 | int bin_info_append_offset_str(const char *base_str, uint64_t low_addr, |
| 558 | uint64_t high_addr, char **result) |
| 559 | { |
| 560 | int ret; |
| 561 | uint64_t offset; |
| 562 | char *_result = NULL; |
| 563 | char offset_str[ADDR_STR_LEN]; |
| 564 | |
| 565 | if (!base_str || !result) { |
| 566 | goto error; |
| 567 | } |
| 568 | |
| 569 | offset = high_addr - low_addr; |
| 570 | |
| 571 | _result = malloc(strlen(base_str) + ADDR_STR_LEN); |
| 572 | if (!_result) { |
| 573 | goto error; |
| 574 | } |
| 575 | |
| 576 | ret = snprintf(offset_str, ADDR_STR_LEN, "+%#0" PRIx64, offset); |
| 577 | if (ret < 0) { |
| 578 | goto error; |
| 579 | } |
| 580 | strcpy(_result, base_str); |
| 581 | strcat(_result, offset_str); |
| 582 | *result = _result; |
| 583 | |
| 584 | return 0; |
| 585 | |
| 586 | error: |
| 587 | free(_result); |
| 588 | return -1; |
| 589 | } |
| 590 | |
| 591 | /** |
| 592 | * Try to find the symbol closest to an address within a given ELF |
| 593 | * section. |
| 594 | * |
| 595 | * Only function symbols are taken into account. The symbol's address |
| 596 | * must precede `addr`. A symbol with a closer address might exist |
| 597 | * after `addr` but is irrelevant because it cannot encompass `addr`. |
| 598 | * |
| 599 | * On success, if found, the out parameters `sym` and `shdr` are |
| 600 | * set. On failure or if none are found, they remain unchanged. |
| 601 | * |
| 602 | * @param scn ELF section in which to look for the address |
| 603 | * @param addr Virtual memory address for which to find the |
| 604 | * nearest function symbol |
| 605 | * @param sym Out parameter, the nearest function symbol |
| 606 | * @param shdr Out parameter, the section header for scn |
| 607 | * @returns 0 on success, -1 on failure |
| 608 | */ |
| 609 | static |
| 610 | int bin_info_get_nearest_symbol_from_section(Elf_Scn *scn, uint64_t addr, |
| 611 | GElf_Sym **sym, GElf_Shdr **shdr) |
| 612 | { |
| 613 | int i; |
| 614 | size_t symbol_count; |
| 615 | Elf_Data *data = NULL; |
| 616 | GElf_Shdr *_shdr = NULL; |
| 617 | GElf_Sym *nearest_sym = NULL; |
| 618 | |
| 619 | if (!scn || !sym || !shdr) { |
| 620 | goto error; |
| 621 | } |
| 622 | |
| 623 | _shdr = g_new0(GElf_Shdr, 1); |
| 624 | if (!_shdr) { |
| 625 | goto error; |
| 626 | } |
| 627 | |
| 628 | _shdr = gelf_getshdr(scn, _shdr); |
| 629 | if (!_shdr) { |
| 630 | goto error; |
| 631 | } |
| 632 | |
| 633 | if (_shdr->sh_type != SHT_SYMTAB) { |
| 634 | /* |
| 635 | * We are only interested in symbol table (symtab) |
| 636 | * sections, skip this one. |
| 637 | */ |
| 638 | goto end; |
| 639 | } |
| 640 | |
| 641 | data = elf_getdata(scn, NULL); |
| 642 | if (!data) { |
| 643 | goto error; |
| 644 | } |
| 645 | |
| 646 | symbol_count = _shdr->sh_size / _shdr->sh_entsize; |
| 647 | |
| 648 | for (i = 0; i < symbol_count; ++i) { |
| 649 | GElf_Sym *cur_sym = NULL; |
| 650 | |
| 651 | cur_sym = g_new0(GElf_Sym, 1); |
| 652 | if (!cur_sym) { |
| 653 | goto error; |
| 654 | } |
| 655 | cur_sym = gelf_getsym(data, i, cur_sym); |
| 656 | if (!cur_sym) { |
| 657 | goto error; |
| 658 | } |
| 659 | if (GELF_ST_TYPE(cur_sym->st_info) != STT_FUNC) { |
| 660 | /* We're only interested in the functions. */ |
| 661 | g_free(cur_sym); |
| 662 | continue; |
| 663 | } |
| 664 | |
| 665 | if (cur_sym->st_value <= addr && |
| 666 | (!nearest_sym || |
| 667 | cur_sym->st_value > nearest_sym->st_value)) { |
| 668 | g_free(nearest_sym); |
| 669 | nearest_sym = cur_sym; |
| 670 | } else { |
| 671 | g_free(cur_sym); |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | end: |
| 676 | if (nearest_sym) { |
| 677 | *sym = nearest_sym; |
| 678 | *shdr = _shdr; |
| 679 | } else { |
| 680 | g_free(_shdr); |
| 681 | } |
| 682 | |
| 683 | return 0; |
| 684 | |
| 685 | error: |
| 686 | g_free(nearest_sym); |
| 687 | g_free(_shdr); |
| 688 | return -1; |
| 689 | } |
| 690 | |
| 691 | /** |
| 692 | * Get the name of the function containing a given address within an |
| 693 | * executable using ELF symbols. |
| 694 | * |
| 695 | * The function name is in fact the name of the nearest ELF symbol, |
| 696 | * followed by the offset in bytes between the address and the symbol |
| 697 | * (in hex), separated by a '+' character. |
| 698 | * |
| 699 | * If found, the out parameter `func_name` is set on success. On failure, |
| 700 | * it remains unchanged. |
| 701 | * |
| 702 | * @param bin bin_info instance for the executable containing |
| 703 | * the address |
| 704 | * @param addr Virtual memory address for which to find the |
| 705 | * function name |
| 706 | * @param func_name Out parameter, the function name |
| 707 | * @returns 0 on success, -1 on failure |
| 708 | */ |
| 709 | static |
| 710 | int bin_info_lookup_elf_function_name(struct bin_info *bin, uint64_t addr, |
| 711 | char **func_name) |
| 712 | { |
| 713 | /* |
| 714 | * TODO (possible optimisation): if an ELF has no symtab |
| 715 | * section, it has been stripped. Therefore, it would be wise |
| 716 | * to store a flag indicating the stripped status after the |
| 717 | * first iteration to prevent subsequent ones. |
| 718 | */ |
| 719 | int ret = 0; |
| 720 | Elf_Scn *scn = NULL; |
| 721 | GElf_Sym *sym = NULL; |
| 722 | GElf_Shdr *shdr = NULL; |
| 723 | char *sym_name = NULL; |
| 724 | |
| 725 | /* Set ELF file if it hasn't been accessed yet. */ |
| 726 | if (!bin->elf_file) { |
| 727 | ret = bin_info_set_elf_file(bin); |
| 728 | if (ret) { |
| 729 | /* Failed to set ELF file. */ |
| 730 | goto error; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | scn = elf_nextscn(bin->elf_file, scn); |
| 735 | if (!scn) { |
| 736 | goto error; |
| 737 | } |
| 738 | |
| 739 | while (scn && !sym) { |
| 740 | ret = bin_info_get_nearest_symbol_from_section( |
| 741 | scn, addr, &sym, &shdr); |
| 742 | if (ret) { |
| 743 | goto error; |
| 744 | } |
| 745 | |
| 746 | scn = elf_nextscn(bin->elf_file, scn); |
| 747 | } |
| 748 | |
| 749 | if (sym) { |
| 750 | sym_name = elf_strptr(bin->elf_file, shdr->sh_link, |
| 751 | sym->st_name); |
| 752 | if (!sym_name) { |
| 753 | goto error; |
| 754 | } |
| 755 | |
| 756 | ret = bin_info_append_offset_str(sym_name, sym->st_value, addr, |
| 757 | func_name); |
| 758 | if (ret) { |
| 759 | goto error; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | g_free(shdr); |
| 764 | g_free(sym); |
| 765 | return 0; |
| 766 | |
| 767 | error: |
| 768 | g_free(shdr); |
| 769 | g_free(sym); |
| 770 | return ret; |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * Get the name of the function containing a given address within a |
| 775 | * given compile unit (CU). |
| 776 | * |
| 777 | * If found, the out parameter `func_name` is set on success. On |
| 778 | * failure, it remains unchanged. |
| 779 | * |
| 780 | * @param cu bt_dwarf_cu instance which may contain the address |
| 781 | * @param addr Virtual memory address for which to find the |
| 782 | * function name |
| 783 | * @param func_name Out parameter, the function name |
| 784 | * @returns 0 on success, -1 on failure |
| 785 | */ |
| 786 | static |
| 787 | int bin_info_lookup_cu_function_name(struct bt_dwarf_cu *cu, uint64_t addr, |
| 788 | char **func_name) |
| 789 | { |
| 790 | int ret = 0; |
| 791 | bool found = false; |
| 792 | struct bt_dwarf_die *die = NULL; |
| 793 | |
| 794 | if (!cu || !func_name) { |
| 795 | goto error; |
| 796 | } |
| 797 | |
| 798 | die = bt_dwarf_die_create(cu); |
| 799 | if (!die) { |
| 800 | goto error; |
| 801 | } |
| 802 | |
| 803 | while (bt_dwarf_die_next(die) == 0) { |
| 804 | int tag; |
| 805 | |
| 806 | ret = bt_dwarf_die_get_tag(die, &tag); |
| 807 | if (ret) { |
| 808 | goto error; |
| 809 | } |
| 810 | |
| 811 | if (tag == DW_TAG_subprogram) { |
| 812 | ret = bt_dwarf_die_contains_addr(die, addr, &found); |
| 813 | if (ret) { |
| 814 | goto error; |
| 815 | } |
| 816 | |
| 817 | if (found) { |
| 818 | break; |
| 819 | } |
| 820 | } |
| 821 | } |
| 822 | |
| 823 | if (found) { |
| 824 | uint64_t low_addr = 0; |
| 825 | char *die_name = NULL; |
| 826 | |
| 827 | ret = bt_dwarf_die_get_name(die, &die_name); |
| 828 | if (ret) { |
| 829 | goto error; |
| 830 | } |
| 831 | |
| 832 | ret = dwarf_lowpc(die->dwarf_die, &low_addr); |
| 833 | if (ret) { |
| 834 | free(die_name); |
| 835 | goto error; |
| 836 | } |
| 837 | |
| 838 | ret = bin_info_append_offset_str(die_name, low_addr, addr, |
| 839 | func_name); |
| 840 | free(die_name); |
| 841 | if (ret) { |
| 842 | goto error; |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | bt_dwarf_die_destroy(die); |
| 847 | return 0; |
| 848 | |
| 849 | error: |
| 850 | bt_dwarf_die_destroy(die); |
| 851 | return -1; |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * Get the name of the function containing a given address within an |
| 856 | * executable using DWARF debug info. |
| 857 | * |
| 858 | * If found, the out parameter `func_name` is set on success. On |
| 859 | * failure, it remains unchanged. |
| 860 | * |
| 861 | * @param bin bin_info instance for the executable containing |
| 862 | * the address |
| 863 | * @param addr Virtual memory address for which to find the |
| 864 | * function name |
| 865 | * @param func_name Out parameter, the function name |
| 866 | * @returns 0 on success, -1 on failure |
| 867 | */ |
| 868 | static |
| 869 | int bin_info_lookup_dwarf_function_name(struct bin_info *bin, uint64_t addr, |
| 870 | char **func_name) |
| 871 | { |
| 872 | int ret = 0; |
| 873 | char *_func_name = NULL; |
| 874 | struct bt_dwarf_cu *cu = NULL; |
| 875 | |
| 876 | if (!bin || !func_name) { |
| 877 | goto error; |
| 878 | } |
| 879 | |
| 880 | cu = bt_dwarf_cu_create(bin->dwarf_info); |
| 881 | if (!cu) { |
| 882 | goto error; |
| 883 | } |
| 884 | |
| 885 | while (bt_dwarf_cu_next(cu) == 0) { |
| 886 | ret = bin_info_lookup_cu_function_name(cu, addr, &_func_name); |
| 887 | if (ret) { |
| 888 | goto error; |
| 889 | } |
| 890 | |
| 891 | if (_func_name) { |
| 892 | break; |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | if (_func_name) { |
| 897 | *func_name = _func_name; |
| 898 | } else { |
| 899 | goto error; |
| 900 | } |
| 901 | |
| 902 | bt_dwarf_cu_destroy(cu); |
| 903 | return 0; |
| 904 | |
| 905 | error: |
| 906 | bt_dwarf_cu_destroy(cu); |
| 907 | return -1; |
| 908 | } |
| 909 | |
| 910 | BT_HIDDEN |
| 911 | int bin_info_lookup_function_name(struct bin_info *bin, uint64_t addr, |
| 912 | char **func_name) |
| 913 | { |
| 914 | int ret = 0; |
| 915 | char *_func_name = NULL; |
| 916 | |
| 917 | if (!bin || !func_name) { |
| 918 | goto error; |
| 919 | } |
| 920 | |
| 921 | /* Set DWARF info if it hasn't been accessed yet. */ |
| 922 | if (!bin->dwarf_info && !bin->is_elf_only) { |
| 923 | ret = bin_info_set_dwarf_info(bin); |
| 924 | if (ret) { |
| 925 | printf_verbose("Failed to set bin dwarf info, falling back to ELF lookup.\n"); |
| 926 | /* Failed to set DWARF info, fallback to ELF. */ |
| 927 | bin->is_elf_only = true; |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | if (!bin_info_has_address(bin, addr)) { |
| 932 | goto error; |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * Addresses in ELF and DWARF are relative to base address for |
| 937 | * PIC, so make the address argument relative too if needed. |
| 938 | */ |
| 939 | if (bin->is_pic) { |
| 940 | addr -= bin->low_addr; |
| 941 | } |
| 942 | |
| 943 | if (bin->is_elf_only) { |
| 944 | ret = bin_info_lookup_elf_function_name(bin, addr, &_func_name); |
| 945 | printf_verbose("Failed to lookup function name (elf), error %i\n", ret); |
| 946 | } else { |
| 947 | ret = bin_info_lookup_dwarf_function_name(bin, addr, &_func_name); |
| 948 | printf_verbose("Failed to lookup function name (dwarf), error %i\n", ret); |
| 949 | } |
| 950 | |
| 951 | *func_name = _func_name; |
| 952 | return 0; |
| 953 | |
| 954 | error: |
| 955 | return -1; |
| 956 | } |
| 957 | |
| 958 | BT_HIDDEN |
| 959 | int bin_info_get_bin_loc(struct bin_info *bin, uint64_t addr, char **bin_loc) |
| 960 | { |
| 961 | int ret = 0; |
| 962 | char *_bin_loc = NULL; |
| 963 | |
| 964 | if (!bin || !bin_loc) { |
| 965 | goto error; |
| 966 | } |
| 967 | |
| 968 | if (bin->is_pic) { |
| 969 | addr -= bin->low_addr; |
| 970 | ret = asprintf(&_bin_loc, "+%#0" PRIx64, addr); |
| 971 | } else { |
| 972 | ret = asprintf(&_bin_loc, "@%#0" PRIx64, addr); |
| 973 | } |
| 974 | |
| 975 | if (ret == -1 || !_bin_loc) { |
| 976 | goto error; |
| 977 | } |
| 978 | |
| 979 | *bin_loc = _bin_loc; |
| 980 | return 0; |
| 981 | |
| 982 | error: |
| 983 | return -1; |
| 984 | } |
| 985 | |
| 986 | /** |
| 987 | * Predicate used to determine whether the children of a given DIE |
| 988 | * contain a specific address. |
| 989 | * |
| 990 | * More specifically, the parameter `die` is expected to be a |
| 991 | * subprogram (function) DIE, and this predicate tells whether any |
| 992 | * subroutines are inlined within this function and would contain |
| 993 | * `addr`. |
| 994 | * |
| 995 | * On success, the out parameter `contains` is set with the boolean |
| 996 | * value indicating whether the DIE's range covers `addr`. On failure, |
| 997 | * it remains unchanged. |
| 998 | * |
| 999 | * Do note that this function advances the position of `die`. If the |
| 1000 | * address is found within one of its children, `die` will be pointing |
| 1001 | * to that child upon returning from the function, allowing to extract |
| 1002 | * the information deemed necessary. |
| 1003 | * |
| 1004 | * @param die The parent DIE in whose children the address will be |
| 1005 | * looked for |
| 1006 | * @param addr The address for which to look for in the DIEs |
| 1007 | * @param contains Out parameter, true if addr is contained, |
| 1008 | * false if not |
| 1009 | * @returns Returns 0 on success, -1 on failure |
| 1010 | */ |
| 1011 | static |
| 1012 | int bin_info_child_die_has_address(struct bt_dwarf_die *die, uint64_t addr, bool *contains) |
| 1013 | { |
| 1014 | int ret = 0; |
| 1015 | bool _contains = false; |
| 1016 | |
| 1017 | if (!die) { |
| 1018 | goto error; |
| 1019 | } |
| 1020 | |
| 1021 | ret = bt_dwarf_die_child(die); |
| 1022 | if (ret) { |
| 1023 | goto error; |
| 1024 | } |
| 1025 | |
| 1026 | do { |
| 1027 | int tag; |
| 1028 | |
| 1029 | ret = bt_dwarf_die_get_tag(die, &tag); |
| 1030 | if (ret) { |
| 1031 | goto error; |
| 1032 | } |
| 1033 | |
| 1034 | if (tag == DW_TAG_inlined_subroutine) { |
| 1035 | ret = bt_dwarf_die_contains_addr(die, addr, &_contains); |
| 1036 | if (ret) { |
| 1037 | goto error; |
| 1038 | } |
| 1039 | |
| 1040 | if (_contains) { |
| 1041 | goto end; |
| 1042 | } |
| 1043 | } |
| 1044 | } while (bt_dwarf_die_next(die) == 0); |
| 1045 | |
| 1046 | end: |
| 1047 | *contains = _contains; |
| 1048 | return 0; |
| 1049 | |
| 1050 | error: |
| 1051 | return -1; |
| 1052 | } |
| 1053 | |
| 1054 | /** |
| 1055 | * Lookup the source location for a given address within a CU, making |
| 1056 | * the assumption that it is contained within an inline routine in a |
| 1057 | * function. |
| 1058 | * |
| 1059 | * @param cu bt_dwarf_cu instance in which to look for the address |
| 1060 | * @param addr The address for which to look for |
| 1061 | * @param src_loc Out parameter, the source location (filename and |
| 1062 | * line number) for the address |
| 1063 | * @returns 0 on success, -1 on failure |
| 1064 | */ |
| 1065 | static |
| 1066 | int bin_info_lookup_cu_src_loc_inl(struct bt_dwarf_cu *cu, uint64_t addr, |
| 1067 | struct source_location **src_loc) |
| 1068 | { |
| 1069 | int ret = 0; |
| 1070 | bool found = false; |
| 1071 | struct bt_dwarf_die *die = NULL; |
| 1072 | struct source_location *_src_loc = NULL; |
| 1073 | |
| 1074 | if (!cu || !src_loc) { |
| 1075 | goto error; |
| 1076 | } |
| 1077 | |
| 1078 | die = bt_dwarf_die_create(cu); |
| 1079 | if (!die) { |
| 1080 | goto error; |
| 1081 | } |
| 1082 | |
| 1083 | while (bt_dwarf_die_next(die) == 0) { |
| 1084 | int tag; |
| 1085 | |
| 1086 | ret = bt_dwarf_die_get_tag(die, &tag); |
| 1087 | if (ret) { |
| 1088 | goto error; |
| 1089 | } |
| 1090 | |
| 1091 | if (tag == DW_TAG_subprogram) { |
| 1092 | bool contains = false; |
| 1093 | |
| 1094 | ret = bt_dwarf_die_contains_addr(die, addr, &contains); |
| 1095 | if (ret) { |
| 1096 | goto error; |
| 1097 | } |
| 1098 | |
| 1099 | if (contains) { |
| 1100 | /* |
| 1101 | * Try to find an inlined subroutine |
| 1102 | * child of this DIE containing addr. |
| 1103 | */ |
| 1104 | ret = bin_info_child_die_has_address(die, addr, |
| 1105 | &found); |
| 1106 | if(ret) { |
| 1107 | goto error; |
| 1108 | } |
| 1109 | |
| 1110 | goto end; |
| 1111 | } |
| 1112 | } |
| 1113 | } |
| 1114 | |
| 1115 | end: |
| 1116 | if (found) { |
| 1117 | char *filename = NULL; |
| 1118 | uint64_t line_no; |
| 1119 | |
| 1120 | _src_loc = g_new0(struct source_location, 1); |
| 1121 | if (!_src_loc) { |
| 1122 | goto error; |
| 1123 | } |
| 1124 | |
| 1125 | ret = bt_dwarf_die_get_call_file(die, &filename); |
| 1126 | if (ret) { |
| 1127 | goto error; |
| 1128 | } |
| 1129 | ret = bt_dwarf_die_get_call_line(die, &line_no); |
| 1130 | if (ret) { |
| 1131 | free(filename); |
| 1132 | goto error; |
| 1133 | } |
| 1134 | |
| 1135 | _src_loc->filename = filename; |
| 1136 | _src_loc->line_no = line_no; |
| 1137 | *src_loc = _src_loc; |
| 1138 | } |
| 1139 | |
| 1140 | bt_dwarf_die_destroy(die); |
| 1141 | return 0; |
| 1142 | |
| 1143 | error: |
| 1144 | source_location_destroy(_src_loc); |
| 1145 | bt_dwarf_die_destroy(die); |
| 1146 | return -1; |
| 1147 | } |
| 1148 | |
| 1149 | /** |
| 1150 | * Lookup the source location for a given address within a CU, |
| 1151 | * assuming that it is contained within an inlined function. |
| 1152 | * |
| 1153 | * A source location can be found regardless of inlining status for |
| 1154 | * this method, but in the case of an inlined function, the returned |
| 1155 | * source location will point not to the callsite but rather to the |
| 1156 | * definition site of the inline function. |
| 1157 | * |
| 1158 | * @param cu bt_dwarf_cu instance in which to look for the address |
| 1159 | * @param addr The address for which to look for |
| 1160 | * @param src_loc Out parameter, the source location (filename and |
| 1161 | * line number) for the address |
| 1162 | * @returns 0 on success, -1 on failure |
| 1163 | */ |
| 1164 | static |
| 1165 | int bin_info_lookup_cu_src_loc_no_inl(struct bt_dwarf_cu *cu, uint64_t addr, |
| 1166 | struct source_location **src_loc) |
| 1167 | { |
| 1168 | struct source_location *_src_loc = NULL; |
| 1169 | struct bt_dwarf_die *die = NULL; |
| 1170 | const char *filename = NULL; |
| 1171 | Dwarf_Line *line = NULL; |
| 1172 | Dwarf_Addr line_addr; |
| 1173 | int ret, line_no; |
| 1174 | |
| 1175 | if (!cu || !src_loc) { |
| 1176 | goto error; |
| 1177 | } |
| 1178 | |
| 1179 | die = bt_dwarf_die_create(cu); |
| 1180 | if (!die) { |
| 1181 | goto error; |
| 1182 | } |
| 1183 | |
| 1184 | line = dwarf_getsrc_die(die->dwarf_die, addr); |
| 1185 | if (!line) { |
| 1186 | goto error; |
| 1187 | } |
| 1188 | |
| 1189 | ret = dwarf_lineaddr(line, &line_addr); |
| 1190 | if (ret) { |
| 1191 | goto error; |
| 1192 | } |
| 1193 | |
| 1194 | filename = dwarf_linesrc(line, NULL, NULL); |
| 1195 | if (!filename) { |
| 1196 | goto error; |
| 1197 | } |
| 1198 | |
| 1199 | if (addr == line_addr) { |
| 1200 | _src_loc = g_new0(struct source_location, 1); |
| 1201 | if (!_src_loc) { |
| 1202 | goto error; |
| 1203 | } |
| 1204 | |
| 1205 | ret = dwarf_lineno(line, &line_no); |
| 1206 | if (ret) { |
| 1207 | goto error; |
| 1208 | } |
| 1209 | |
| 1210 | _src_loc->line_no = line_no; |
| 1211 | _src_loc->filename = strdup(filename); |
| 1212 | } |
| 1213 | |
| 1214 | bt_dwarf_die_destroy(die); |
| 1215 | |
| 1216 | if (_src_loc) { |
| 1217 | *src_loc = _src_loc; |
| 1218 | } |
| 1219 | |
| 1220 | return 0; |
| 1221 | |
| 1222 | error: |
| 1223 | source_location_destroy(_src_loc); |
| 1224 | bt_dwarf_die_destroy(die); |
| 1225 | return -1; |
| 1226 | } |
| 1227 | |
| 1228 | /** |
| 1229 | * Get the source location (file name and line number) for a given |
| 1230 | * address within a compile unit (CU). |
| 1231 | * |
| 1232 | * On success, the out parameter `src_loc` is set if found. On |
| 1233 | * failure, it remains unchanged. |
| 1234 | * |
| 1235 | * @param cu bt_dwarf_cu instance for the compile unit which |
| 1236 | * may contain the address |
| 1237 | * @param addr Virtual memory address for which to find the |
| 1238 | * source location |
| 1239 | * @param src_loc Out parameter, the source location |
| 1240 | * @returns 0 on success, -1 on failure |
| 1241 | */ |
| 1242 | static |
| 1243 | int bin_info_lookup_cu_src_loc(struct bt_dwarf_cu *cu, uint64_t addr, |
| 1244 | struct source_location **src_loc) |
| 1245 | { |
| 1246 | int ret = 0; |
| 1247 | struct source_location *_src_loc = NULL; |
| 1248 | |
| 1249 | if (!cu || !src_loc) { |
| 1250 | goto error; |
| 1251 | } |
| 1252 | |
| 1253 | ret = bin_info_lookup_cu_src_loc_inl(cu, addr, &_src_loc); |
| 1254 | if (ret) { |
| 1255 | goto error; |
| 1256 | } |
| 1257 | |
| 1258 | if (_src_loc) { |
| 1259 | goto end; |
| 1260 | } |
| 1261 | |
| 1262 | ret = bin_info_lookup_cu_src_loc_no_inl(cu, addr, &_src_loc); |
| 1263 | if (ret) { |
| 1264 | goto error; |
| 1265 | } |
| 1266 | |
| 1267 | if (_src_loc) { |
| 1268 | goto end; |
| 1269 | } |
| 1270 | |
| 1271 | end: |
| 1272 | if (_src_loc) { |
| 1273 | *src_loc = _src_loc; |
| 1274 | } |
| 1275 | |
| 1276 | return 0; |
| 1277 | |
| 1278 | error: |
| 1279 | source_location_destroy(_src_loc); |
| 1280 | return -1; |
| 1281 | } |
| 1282 | |
| 1283 | BT_HIDDEN |
| 1284 | int bin_info_lookup_source_location(struct bin_info *bin, uint64_t addr, |
| 1285 | struct source_location **src_loc) |
| 1286 | { |
| 1287 | struct bt_dwarf_cu *cu = NULL; |
| 1288 | struct source_location *_src_loc = NULL; |
| 1289 | |
| 1290 | if (!bin || !src_loc) { |
| 1291 | goto error; |
| 1292 | } |
| 1293 | |
| 1294 | /* Set DWARF info if it hasn't been accessed yet. */ |
| 1295 | if (!bin->dwarf_info && !bin->is_elf_only) { |
| 1296 | if (bin_info_set_dwarf_info(bin)) { |
| 1297 | /* Failed to set DWARF info. */ |
| 1298 | bin->is_elf_only = true; |
| 1299 | } |
| 1300 | } |
| 1301 | |
| 1302 | if (bin->is_elf_only) { |
| 1303 | /* We cannot lookup source location without DWARF info. */ |
| 1304 | goto error; |
| 1305 | } |
| 1306 | |
| 1307 | if (!bin_info_has_address(bin, addr)) { |
| 1308 | goto error; |
| 1309 | } |
| 1310 | |
| 1311 | /* |
| 1312 | * Addresses in ELF and DWARF are relative to base address for |
| 1313 | * PIC, so make the address argument relative too if needed. |
| 1314 | */ |
| 1315 | if (bin->is_pic) { |
| 1316 | addr -= bin->low_addr; |
| 1317 | } |
| 1318 | |
| 1319 | cu = bt_dwarf_cu_create(bin->dwarf_info); |
| 1320 | if (!cu) { |
| 1321 | goto error; |
| 1322 | } |
| 1323 | |
| 1324 | while (bt_dwarf_cu_next(cu) == 0) { |
| 1325 | int ret; |
| 1326 | |
| 1327 | ret = bin_info_lookup_cu_src_loc(cu, addr, &_src_loc); |
| 1328 | if (ret) { |
| 1329 | goto error; |
| 1330 | } |
| 1331 | |
| 1332 | if (_src_loc) { |
| 1333 | break; |
| 1334 | } |
| 1335 | } |
| 1336 | |
| 1337 | bt_dwarf_cu_destroy(cu); |
| 1338 | if (_src_loc) { |
| 1339 | *src_loc = _src_loc; |
| 1340 | } |
| 1341 | |
| 1342 | return 0; |
| 1343 | |
| 1344 | error: |
| 1345 | source_location_destroy(_src_loc); |
| 1346 | bt_dwarf_cu_destroy(cu); |
| 1347 | return -1; |
| 1348 | } |