1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2016-2017 Mark Johnston <markj@FreeBSD.org> 5 * Copyright (c) 2010 The FreeBSD Foundation 6 * Copyright (c) 2008 John Birrell (jb@freebsd.org) 7 * All rights reserved. 8 * 9 * Portions of this software were developed by Rui Paulo under sponsorship 10 * from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/types.h> 38 #ifndef NO_CTF 39 #include <sys/ctf.h> 40 #include <sys/ctf_api.h> 41 #endif 42 #include <sys/user.h> 43 44 #include <assert.h> 45 #include <err.h> 46 #include <fcntl.h> 47 #include <libgen.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 #ifndef NO_CTF 53 #include <libctf.h> 54 #endif 55 #include <libutil.h> 56 57 #include <zlib.h> 58 #include "_libproc.h" 59 60 #define PATH_DEBUG_DIR "/usr/lib/debug" 61 62 #ifdef NO_CTF 63 typedef struct ctf_file ctf_file_t; 64 #endif 65 66 #ifndef NO_CXA_DEMANGLE 67 extern char *__cxa_demangle(const char *, char *, size_t *, int *); 68 #endif /* NO_CXA_DEMANGLE */ 69 70 static int 71 crc32_file(int fd, uint32_t *crc) 72 { 73 char buf[MAXPHYS]; 74 ssize_t nr; 75 76 *crc = crc32(0L, Z_NULL, 0); 77 while ((nr = read(fd, buf, sizeof(buf))) > 0) { 78 *crc = crc32(*crc, (char *)buf, nr); 79 } 80 return (!!nr); 81 } 82 83 static void 84 demangle(const char *symbol, char *buf, size_t len) 85 { 86 #ifndef NO_CXA_DEMANGLE 87 char *dembuf; 88 89 if (symbol[0] == '_' && symbol[1] == 'Z' && symbol[2]) { 90 dembuf = __cxa_demangle(symbol, NULL, NULL, NULL); 91 if (!dembuf) 92 goto fail; 93 strlcpy(buf, dembuf, len); 94 free(dembuf); 95 return; 96 } 97 fail: 98 #endif /* NO_CXA_DEMANGLE */ 99 strlcpy(buf, symbol, len); 100 } 101 102 struct symsort_thunk { 103 Elf *e; 104 struct symtab *symtab; 105 }; 106 107 static int 108 symvalcmp(const void *a1, const void *a2, void *_thunk) 109 { 110 GElf_Sym sym1, sym2; 111 struct symsort_thunk *thunk; 112 const char *s1, *s2; 113 u_int i1, i2; 114 int bind1, bind2; 115 116 i1 = *(const u_int *)a1; 117 i2 = *(const u_int *)a2; 118 thunk = _thunk; 119 120 (void)gelf_getsym(thunk->symtab->data, i1, &sym1); 121 (void)gelf_getsym(thunk->symtab->data, i2, &sym2); 122 123 if (sym1.st_value != sym2.st_value) 124 return (sym1.st_value < sym2.st_value ? -1 : 1); 125 126 /* Prefer non-local symbols. */ 127 bind1 = GELF_ST_BIND(sym1.st_info); 128 bind2 = GELF_ST_BIND(sym2.st_info); 129 if (bind1 != bind2) { 130 if (bind1 == STB_LOCAL && bind2 != STB_LOCAL) 131 return (-1); 132 if (bind1 != STB_LOCAL && bind2 == STB_LOCAL) 133 return (1); 134 } 135 136 s1 = elf_strptr(thunk->e, thunk->symtab->stridx, sym1.st_name); 137 s2 = elf_strptr(thunk->e, thunk->symtab->stridx, sym2.st_name); 138 if (s1 != NULL && s2 != NULL) { 139 /* Prefer symbols without a leading '$'. */ 140 if (*s1 == '$') 141 return (-1); 142 if (*s2 == '$') 143 return (1); 144 145 /* Prefer symbols with fewer leading underscores. */ 146 for (; *s1 == '_' && *s2 == '_'; s1++, s2++) 147 ; 148 if (*s1 == '_') 149 return (-1); 150 if (*s2 == '_') 151 return (1); 152 } 153 154 return (0); 155 } 156 157 static int 158 load_symtab(Elf *e, struct symtab *symtab, u_long sh_type) 159 { 160 GElf_Ehdr ehdr; 161 GElf_Shdr shdr; 162 struct symsort_thunk thunk; 163 Elf_Scn *scn; 164 u_int nsyms; 165 166 if (gelf_getehdr(e, &ehdr) == NULL) 167 return (-1); 168 169 scn = NULL; 170 while ((scn = elf_nextscn(e, scn)) != NULL) { 171 (void)gelf_getshdr(scn, &shdr); 172 if (shdr.sh_type == sh_type) 173 break; 174 } 175 if (scn == NULL) 176 return (-1); 177 178 nsyms = shdr.sh_size / shdr.sh_entsize; 179 if (nsyms > (1 << 20)) 180 return (-1); 181 182 if ((symtab->data = elf_getdata(scn, NULL)) == NULL) 183 return (-1); 184 185 symtab->index = calloc(nsyms, sizeof(u_int)); 186 if (symtab->index == NULL) 187 return (-1); 188 for (u_int i = 0; i < nsyms; i++) 189 symtab->index[i] = i; 190 symtab->nsyms = nsyms; 191 symtab->stridx = shdr.sh_link; 192 193 thunk.e = e; 194 thunk.symtab = symtab; 195 qsort_r(symtab->index, nsyms, sizeof(u_int), symvalcmp, &thunk); 196 197 return (0); 198 } 199 200 static void 201 load_symtabs(struct file_info *file) 202 { 203 204 file->symtab.nsyms = file->dynsymtab.nsyms = 0; 205 (void)load_symtab(file->elf, &file->symtab, SHT_SYMTAB); 206 (void)load_symtab(file->elf, &file->dynsymtab, SHT_DYNSYM); 207 } 208 209 static int 210 open_debug_file(char *path, const char *debugfile, uint32_t crc) 211 { 212 size_t n; 213 uint32_t compcrc; 214 int fd; 215 216 fd = -1; 217 if ((n = strlcat(path, "/", PATH_MAX)) >= PATH_MAX) 218 return (fd); 219 if (strlcat(path, debugfile, PATH_MAX) >= PATH_MAX) 220 goto out; 221 if ((fd = open(path, O_RDONLY | O_CLOEXEC)) < 0) 222 goto out; 223 if (crc32_file(fd, &compcrc) != 0 || crc != compcrc) { 224 DPRINTFX("ERROR: CRC32 mismatch for %s", path); 225 (void)close(fd); 226 fd = -1; 227 } 228 out: 229 path[n] = '\0'; 230 return (fd); 231 } 232 233 /* 234 * Obtain an ELF descriptor for the specified mapped object. If a GNU debuglink 235 * section is present, a descriptor for the corresponding debug file is 236 * returned. 237 */ 238 static int 239 open_object(struct map_info *mapping) 240 { 241 char path[PATH_MAX]; 242 GElf_Shdr shdr; 243 Elf *e, *e2; 244 Elf_Data *data; 245 Elf_Scn *scn; 246 struct file_info *file; 247 prmap_t *map; 248 const char *debugfile, *scnname; 249 size_t ndx; 250 uint32_t crc; 251 int fd, fd2; 252 253 if (mapping->map.pr_mapname[0] == '\0') 254 return (-1); /* anonymous object */ 255 if (mapping->file->elf != NULL) 256 return (0); /* already loaded */ 257 258 file = mapping->file; 259 map = &mapping->map; 260 if ((fd = open(map->pr_mapname, O_RDONLY | O_CLOEXEC)) < 0) { 261 DPRINTF("ERROR: open %s failed", map->pr_mapname); 262 return (-1); 263 } 264 if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL) { 265 DPRINTFX("ERROR: elf_begin() failed: %s", elf_errmsg(-1)); 266 goto err; 267 } 268 if (gelf_getehdr(e, &file->ehdr) != &file->ehdr) { 269 DPRINTFX("ERROR: elf_getehdr() failed: %s", elf_errmsg(-1)); 270 goto err; 271 } 272 273 scn = NULL; 274 while ((scn = elf_nextscn(e, scn)) != NULL) { 275 if (gelf_getshdr(scn, &shdr) != &shdr) { 276 DPRINTFX("ERROR: gelf_getshdr failed: %s", 277 elf_errmsg(-1)); 278 goto err; 279 } 280 if (shdr.sh_type != SHT_PROGBITS) 281 continue; 282 if (elf_getshdrstrndx(e, &ndx) != 0) { 283 DPRINTFX("ERROR: elf_getshdrstrndx failed: %s", 284 elf_errmsg(-1)); 285 goto err; 286 } 287 if ((scnname = elf_strptr(e, ndx, shdr.sh_name)) == NULL) 288 continue; 289 290 if (strcmp(scnname, ".gnu_debuglink") == 0) 291 break; 292 } 293 if (scn == NULL) 294 goto internal; 295 296 if ((data = elf_getdata(scn, NULL)) == NULL) { 297 DPRINTFX("ERROR: elf_getdata failed: %s", elf_errmsg(-1)); 298 goto err; 299 } 300 301 /* 302 * The data contains a null-terminated file name followed by a 4-byte 303 * CRC. 304 */ 305 if (data->d_size < sizeof(crc) + 1) { 306 DPRINTFX("ERROR: debuglink section is too small (%zd bytes)", 307 (ssize_t)data->d_size); 308 goto internal; 309 } 310 if (strnlen(data->d_buf, data->d_size) >= data->d_size - sizeof(crc)) { 311 DPRINTFX("ERROR: no null-terminator in gnu_debuglink section"); 312 goto internal; 313 } 314 315 debugfile = data->d_buf; 316 memcpy(&crc, (char *)data->d_buf + data->d_size - sizeof(crc), 317 sizeof(crc)); 318 319 /* 320 * Search for the debug file using the algorithm described in the gdb 321 * documentation: 322 * - look in the directory containing the object, 323 * - look in the subdirectory ".debug" of the directory containing the 324 * object, 325 * - look in the global debug directories (currently /usr/lib/debug). 326 */ 327 (void)strlcpy(path, map->pr_mapname, sizeof(path)); 328 (void)dirname(path); 329 330 if ((fd2 = open_debug_file(path, debugfile, crc)) >= 0) 331 goto external; 332 333 if (strlcat(path, "/.debug", sizeof(path)) < sizeof(path) && 334 (fd2 = open_debug_file(path, debugfile, crc)) >= 0) 335 goto external; 336 337 (void)snprintf(path, sizeof(path), PATH_DEBUG_DIR); 338 if (strlcat(path, map->pr_mapname, sizeof(path)) < sizeof(path)) { 339 (void)dirname(path); 340 if ((fd2 = open_debug_file(path, debugfile, crc)) >= 0) 341 goto external; 342 } 343 344 internal: 345 /* We didn't find a debug file, just return the object's descriptor. */ 346 file->elf = e; 347 file->fd = fd; 348 load_symtabs(file); 349 return (0); 350 351 external: 352 if ((e2 = elf_begin(fd2, ELF_C_READ, NULL)) == NULL) { 353 DPRINTFX("ERROR: elf_begin failed: %s", elf_errmsg(-1)); 354 (void)close(fd2); 355 goto err; 356 } 357 (void)elf_end(e); 358 (void)close(fd); 359 file->elf = e2; 360 file->fd = fd2; 361 load_symtabs(file); 362 return (0); 363 364 err: 365 if (e != NULL) 366 (void)elf_end(e); 367 (void)close(fd); 368 return (-1); 369 } 370 371 char * 372 proc_objname(struct proc_handle *p, uintptr_t addr, char *objname, 373 size_t objnamesz) 374 { 375 prmap_t *map; 376 size_t i; 377 378 if (p->nmappings == 0) 379 if (proc_rdagent(p) == NULL) 380 return (NULL); 381 for (i = 0; i < p->nmappings; i++) { 382 map = &p->mappings[i].map; 383 if (addr >= map->pr_vaddr && 384 addr < map->pr_vaddr + map->pr_size) { 385 strlcpy(objname, map->pr_mapname, objnamesz); 386 return (objname); 387 } 388 } 389 return (NULL); 390 } 391 392 int 393 proc_iter_objs(struct proc_handle *p, proc_map_f *func, void *cd) 394 { 395 char last[MAXPATHLEN], path[MAXPATHLEN], *base; 396 prmap_t *map; 397 size_t i; 398 int error; 399 400 if (p->nmappings == 0) 401 if (proc_rdagent(p) == NULL) 402 return (-1); 403 404 error = 0; 405 memset(last, 0, sizeof(last)); 406 for (i = 0; i < p->nmappings; i++) { 407 map = &p->mappings[i].map; 408 strlcpy(path, map->pr_mapname, sizeof(path)); 409 base = basename(path); 410 /* 411 * We shouldn't call the callback twice with the same object. 412 * To do that we are assuming the fact that if there are 413 * repeated object names (i.e. different mappings for the 414 * same object) they occur next to each other. 415 */ 416 if (strcmp(base, last) == 0) 417 continue; 418 if ((error = (*func)(cd, map, base)) != 0) 419 break; 420 strlcpy(last, path, sizeof(last)); 421 } 422 return (error); 423 } 424 425 static struct map_info * 426 _proc_addr2map(struct proc_handle *p, uintptr_t addr) 427 { 428 struct map_info *mapping; 429 size_t i; 430 431 if (p->nmappings == 0) 432 if (proc_rdagent(p) == NULL) 433 return (NULL); 434 for (i = 0; i < p->nmappings; i++) { 435 mapping = &p->mappings[i]; 436 if (addr >= mapping->map.pr_vaddr && 437 addr < mapping->map.pr_vaddr + mapping->map.pr_size) 438 return (mapping); 439 } 440 return (NULL); 441 } 442 443 prmap_t * 444 proc_addr2map(struct proc_handle *p, uintptr_t addr) 445 { 446 447 return (&_proc_addr2map(p, addr)->map); 448 } 449 450 /* 451 * Look up the symbol at addr using a binary search, returning a copy of the 452 * symbol and its name. 453 */ 454 static int 455 lookup_symbol_by_addr(Elf *e, struct symtab *symtab, uintptr_t addr, 456 const char **namep, GElf_Sym *symp) 457 { 458 GElf_Sym sym; 459 Elf_Data *data; 460 const char *s; 461 u_int i, min, max, mid; 462 463 if (symtab->nsyms == 0) 464 return (ENOENT); 465 466 data = symtab->data; 467 min = 0; 468 max = symtab->nsyms - 1; 469 470 while (min <= max) { 471 mid = (max + min) / 2; 472 (void)gelf_getsym(data, symtab->index[mid], &sym); 473 if (addr >= sym.st_value && addr < sym.st_value + sym.st_size) 474 break; 475 476 if (addr < sym.st_value) 477 max = mid - 1; 478 else 479 min = mid + 1; 480 } 481 if (min > max) 482 return (ENOENT); 483 484 /* 485 * Advance until we find the matching symbol with largest index. 486 */ 487 for (i = mid; i < symtab->nsyms; i++) { 488 (void)gelf_getsym(data, symtab->index[i], &sym); 489 if (addr < sym.st_value || addr >= sym.st_value + sym.st_size) 490 break; 491 } 492 (void)gelf_getsym(data, symtab->index[i - 1], symp); 493 s = elf_strptr(e, symtab->stridx, symp->st_name); 494 if (s != NULL && namep != NULL) 495 *namep = s; 496 return (0); 497 } 498 499 int 500 proc_addr2sym(struct proc_handle *p, uintptr_t addr, char *name, 501 size_t namesz, GElf_Sym *symcopy) 502 { 503 struct file_info *file; 504 struct map_info *mapping; 505 const char *s; 506 uintptr_t off; 507 int error; 508 509 if ((mapping = _proc_addr2map(p, addr)) == NULL) { 510 DPRINTFX("ERROR: proc_addr2map failed to resolve 0x%jx", (uintmax_t)addr); 511 return (-1); 512 } 513 if (open_object(mapping) != 0) { 514 DPRINTFX("ERROR: failed to open object %s", 515 mapping->map.pr_mapname); 516 return (-1); 517 } 518 519 file = mapping->file; 520 off = file->ehdr.e_type == ET_DYN ? 521 mapping->map.pr_vaddr - mapping->map.pr_offset : 0; 522 if (addr < off) 523 return (ENOENT); 524 addr -= off; 525 526 error = lookup_symbol_by_addr(file->elf, &file->dynsymtab, addr, &s, 527 symcopy); 528 if (error == ENOENT) 529 error = lookup_symbol_by_addr(file->elf, &file->symtab, addr, 530 &s, symcopy); 531 if (error == 0) { 532 symcopy->st_value += off; 533 demangle(s, name, namesz); 534 } 535 return (error); 536 } 537 538 static struct map_info * 539 _proc_name2map(struct proc_handle *p, const char *name) 540 { 541 char path[MAXPATHLEN], *base; 542 struct map_info *mapping; 543 size_t i, len; 544 545 if ((len = strlen(name)) == 0) 546 return (NULL); 547 if (p->nmappings == 0) 548 if (proc_rdagent(p) == NULL) 549 return (NULL); 550 for (i = 0; i < p->nmappings; i++) { 551 mapping = &p->mappings[i]; 552 (void)strlcpy(path, mapping->map.pr_mapname, sizeof(path)); 553 base = basename(path); 554 if (strcmp(base, name) == 0) 555 return (mapping); 556 } 557 /* If we didn't find a match, try matching prefixes of the basename. */ 558 for (i = 0; i < p->nmappings; i++) { 559 mapping = &p->mappings[i]; 560 strlcpy(path, mapping->map.pr_mapname, sizeof(path)); 561 base = basename(path); 562 if (strncmp(base, name, len) == 0) 563 return (mapping); 564 } 565 if (strcmp(name, "a.out") == 0) 566 return (_proc_addr2map(p, 567 p->mappings[p->exec_map].map.pr_vaddr)); 568 return (NULL); 569 } 570 571 prmap_t * 572 proc_name2map(struct proc_handle *p, const char *name) 573 { 574 575 return (&_proc_name2map(p, name)->map); 576 } 577 578 /* 579 * Look up the symbol with the given name and return a copy of it. 580 */ 581 static int 582 lookup_symbol_by_name(Elf *elf, struct symtab *symtab, const char *symbol, 583 GElf_Sym *symcopy, prsyminfo_t *si) 584 { 585 GElf_Sym sym; 586 Elf_Data *data; 587 char *s; 588 int i; 589 590 if (symtab->nsyms == 0) 591 return (ENOENT); 592 data = symtab->data; 593 for (i = 0; gelf_getsym(data, i, &sym) != NULL; i++) { 594 s = elf_strptr(elf, symtab->stridx, sym.st_name); 595 if (s != NULL && strcmp(s, symbol) == 0) { 596 memcpy(symcopy, &sym, sizeof(*symcopy)); 597 if (si != NULL) 598 si->prs_id = i; 599 return (0); 600 } 601 } 602 return (ENOENT); 603 } 604 605 int 606 proc_name2sym(struct proc_handle *p, const char *object, const char *symbol, 607 GElf_Sym *symcopy, prsyminfo_t *si) 608 { 609 struct file_info *file; 610 struct map_info *mapping; 611 uintptr_t off; 612 int error; 613 614 if ((mapping = _proc_name2map(p, object)) == NULL) { 615 DPRINTFX("ERROR: proc_name2map failed to resolve %s", object); 616 return (-1); 617 } 618 if (open_object(mapping) != 0) { 619 DPRINTFX("ERROR: failed to open object %s", 620 mapping->map.pr_mapname); 621 return (-1); 622 } 623 624 file = mapping->file; 625 off = file->ehdr.e_type == ET_DYN ? 626 mapping->map.pr_vaddr - mapping->map.pr_offset : 0; 627 628 error = lookup_symbol_by_name(file->elf, &file->dynsymtab, symbol, 629 symcopy, si); 630 if (error == ENOENT) 631 error = lookup_symbol_by_name(file->elf, &file->symtab, symbol, 632 symcopy, si); 633 if (error == 0) 634 symcopy->st_value += off; 635 return (error); 636 } 637 638 ctf_file_t * 639 proc_name2ctf(struct proc_handle *p, const char *name) 640 { 641 #ifndef NO_CTF 642 ctf_file_t *ctf; 643 prmap_t *map; 644 int error; 645 646 if ((map = proc_name2map(p, name)) == NULL) 647 return (NULL); 648 649 ctf = ctf_open(map->pr_mapname, &error); 650 return (ctf); 651 #else 652 (void)p; 653 (void)name; 654 return (NULL); 655 #endif 656 } 657 658 int 659 proc_iter_symbyaddr(struct proc_handle *p, const char *object, int which, 660 int mask, proc_sym_f *func, void *cd) 661 { 662 GElf_Sym sym; 663 struct file_info *file; 664 struct map_info *mapping; 665 struct symtab *symtab; 666 const char *s; 667 int error, i; 668 669 if ((mapping = _proc_name2map(p, object)) == NULL) { 670 DPRINTFX("ERROR: proc_name2map failed to resolve %s", object); 671 return (-1); 672 } 673 if (open_object(mapping) != 0) { 674 DPRINTFX("ERROR: failed to open object %s", 675 mapping->map.pr_mapname); 676 return (-1); 677 } 678 679 file = mapping->file; 680 symtab = which == PR_SYMTAB ? &file->symtab : &file->dynsymtab; 681 if (symtab->nsyms == 0) 682 return (-1); 683 684 error = 0; 685 for (i = 0; gelf_getsym(symtab->data, i, &sym) != NULL; i++) { 686 if (GELF_ST_BIND(sym.st_info) == STB_LOCAL && 687 (mask & BIND_LOCAL) == 0) 688 continue; 689 if (GELF_ST_BIND(sym.st_info) == STB_GLOBAL && 690 (mask & BIND_GLOBAL) == 0) 691 continue; 692 if (GELF_ST_BIND(sym.st_info) == STB_WEAK && 693 (mask & BIND_WEAK) == 0) 694 continue; 695 if (GELF_ST_TYPE(sym.st_info) == STT_NOTYPE && 696 (mask & TYPE_NOTYPE) == 0) 697 continue; 698 if (GELF_ST_TYPE(sym.st_info) == STT_OBJECT && 699 (mask & TYPE_OBJECT) == 0) 700 continue; 701 if (GELF_ST_TYPE(sym.st_info) == STT_FUNC && 702 (mask & TYPE_FUNC) == 0) 703 continue; 704 if (GELF_ST_TYPE(sym.st_info) == STT_SECTION && 705 (mask & TYPE_SECTION) == 0) 706 continue; 707 if (GELF_ST_TYPE(sym.st_info) == STT_FILE && 708 (mask & TYPE_FILE) == 0) 709 continue; 710 s = elf_strptr(file->elf, symtab->stridx, sym.st_name); 711 if (file->ehdr.e_type == ET_DYN) 712 sym.st_value += mapping->map.pr_vaddr; 713 if ((error = (*func)(cd, &sym, s)) != 0) 714 break; 715 } 716 return (error); 717 } 718