1 #include <dirent.h> 2 #include <errno.h> 3 #include <stdlib.h> 4 #include <stdio.h> 5 #include <string.h> 6 #include <sys/types.h> 7 #include <sys/stat.h> 8 #include <sys/param.h> 9 #include <fcntl.h> 10 #include <unistd.h> 11 #include <inttypes.h> 12 #include "build-id.h" 13 #include "util.h" 14 #include "debug.h" 15 #include "machine.h" 16 #include "symbol.h" 17 #include "strlist.h" 18 #include "intlist.h" 19 #include "header.h" 20 21 #include <elf.h> 22 #include <limits.h> 23 #include <symbol/kallsyms.h> 24 #include <sys/utsname.h> 25 26 static int dso__load_kernel_sym(struct dso *dso, struct map *map, 27 symbol_filter_t filter); 28 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, 29 symbol_filter_t filter); 30 int vmlinux_path__nr_entries; 31 char **vmlinux_path; 32 33 struct symbol_conf symbol_conf = { 34 .use_modules = true, 35 .try_vmlinux_path = true, 36 .annotate_src = true, 37 .demangle = true, 38 .demangle_kernel = false, 39 .cumulate_callchain = true, 40 .show_hist_headers = true, 41 .symfs = "", 42 .event_group = true, 43 }; 44 45 static enum dso_binary_type binary_type_symtab[] = { 46 DSO_BINARY_TYPE__KALLSYMS, 47 DSO_BINARY_TYPE__GUEST_KALLSYMS, 48 DSO_BINARY_TYPE__JAVA_JIT, 49 DSO_BINARY_TYPE__DEBUGLINK, 50 DSO_BINARY_TYPE__BUILD_ID_CACHE, 51 DSO_BINARY_TYPE__FEDORA_DEBUGINFO, 52 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, 53 DSO_BINARY_TYPE__BUILDID_DEBUGINFO, 54 DSO_BINARY_TYPE__SYSTEM_PATH_DSO, 55 DSO_BINARY_TYPE__GUEST_KMODULE, 56 DSO_BINARY_TYPE__GUEST_KMODULE_COMP, 57 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, 58 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP, 59 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, 60 DSO_BINARY_TYPE__NOT_FOUND, 61 }; 62 63 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) 64 65 bool symbol_type__is_a(char symbol_type, enum map_type map_type) 66 { 67 symbol_type = toupper(symbol_type); 68 69 switch (map_type) { 70 case MAP__FUNCTION: 71 return symbol_type == 'T' || symbol_type == 'W'; 72 case MAP__VARIABLE: 73 return symbol_type == 'D'; 74 default: 75 return false; 76 } 77 } 78 79 static int prefix_underscores_count(const char *str) 80 { 81 const char *tail = str; 82 83 while (*tail == '_') 84 tail++; 85 86 return tail - str; 87 } 88 89 int __weak arch__choose_best_symbol(struct symbol *syma, 90 struct symbol *symb __maybe_unused) 91 { 92 /* Avoid "SyS" kernel syscall aliases */ 93 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3)) 94 return SYMBOL_B; 95 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10)) 96 return SYMBOL_B; 97 98 return SYMBOL_A; 99 } 100 101 static int choose_best_symbol(struct symbol *syma, struct symbol *symb) 102 { 103 s64 a; 104 s64 b; 105 size_t na, nb; 106 107 /* Prefer a symbol with non zero length */ 108 a = syma->end - syma->start; 109 b = symb->end - symb->start; 110 if ((b == 0) && (a > 0)) 111 return SYMBOL_A; 112 else if ((a == 0) && (b > 0)) 113 return SYMBOL_B; 114 115 /* Prefer a non weak symbol over a weak one */ 116 a = syma->binding == STB_WEAK; 117 b = symb->binding == STB_WEAK; 118 if (b && !a) 119 return SYMBOL_A; 120 if (a && !b) 121 return SYMBOL_B; 122 123 /* Prefer a global symbol over a non global one */ 124 a = syma->binding == STB_GLOBAL; 125 b = symb->binding == STB_GLOBAL; 126 if (a && !b) 127 return SYMBOL_A; 128 if (b && !a) 129 return SYMBOL_B; 130 131 /* Prefer a symbol with less underscores */ 132 a = prefix_underscores_count(syma->name); 133 b = prefix_underscores_count(symb->name); 134 if (b > a) 135 return SYMBOL_A; 136 else if (a > b) 137 return SYMBOL_B; 138 139 /* Choose the symbol with the longest name */ 140 na = strlen(syma->name); 141 nb = strlen(symb->name); 142 if (na > nb) 143 return SYMBOL_A; 144 else if (na < nb) 145 return SYMBOL_B; 146 147 return arch__choose_best_symbol(syma, symb); 148 } 149 150 void symbols__fixup_duplicate(struct rb_root *symbols) 151 { 152 struct rb_node *nd; 153 struct symbol *curr, *next; 154 155 nd = rb_first(symbols); 156 157 while (nd) { 158 curr = rb_entry(nd, struct symbol, rb_node); 159 again: 160 nd = rb_next(&curr->rb_node); 161 next = rb_entry(nd, struct symbol, rb_node); 162 163 if (!nd) 164 break; 165 166 if (curr->start != next->start) 167 continue; 168 169 if (choose_best_symbol(curr, next) == SYMBOL_A) { 170 rb_erase(&next->rb_node, symbols); 171 symbol__delete(next); 172 goto again; 173 } else { 174 nd = rb_next(&curr->rb_node); 175 rb_erase(&curr->rb_node, symbols); 176 symbol__delete(curr); 177 } 178 } 179 } 180 181 void symbols__fixup_end(struct rb_root *symbols) 182 { 183 struct rb_node *nd, *prevnd = rb_first(symbols); 184 struct symbol *curr, *prev; 185 186 if (prevnd == NULL) 187 return; 188 189 curr = rb_entry(prevnd, struct symbol, rb_node); 190 191 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 192 prev = curr; 193 curr = rb_entry(nd, struct symbol, rb_node); 194 195 if (prev->end == prev->start && prev->end != curr->start) 196 prev->end = curr->start; 197 } 198 199 /* Last entry */ 200 if (curr->end == curr->start) 201 curr->end = roundup(curr->start, 4096); 202 } 203 204 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) 205 { 206 struct maps *maps = &mg->maps[type]; 207 struct map *next, *curr; 208 209 pthread_rwlock_wrlock(&maps->lock); 210 211 curr = maps__first(maps); 212 if (curr == NULL) 213 goto out_unlock; 214 215 for (next = map__next(curr); next; next = map__next(curr)) { 216 curr->end = next->start; 217 curr = next; 218 } 219 220 /* 221 * We still haven't the actual symbols, so guess the 222 * last map final address. 223 */ 224 curr->end = ~0ULL; 225 226 out_unlock: 227 pthread_rwlock_unlock(&maps->lock); 228 } 229 230 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name) 231 { 232 size_t namelen = strlen(name) + 1; 233 struct symbol *sym = calloc(1, (symbol_conf.priv_size + 234 sizeof(*sym) + namelen)); 235 if (sym == NULL) 236 return NULL; 237 238 if (symbol_conf.priv_size) 239 sym = ((void *)sym) + symbol_conf.priv_size; 240 241 sym->start = start; 242 sym->end = len ? start + len : start; 243 sym->binding = binding; 244 sym->namelen = namelen - 1; 245 246 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", 247 __func__, name, start, sym->end); 248 memcpy(sym->name, name, namelen); 249 250 return sym; 251 } 252 253 void symbol__delete(struct symbol *sym) 254 { 255 free(((void *)sym) - symbol_conf.priv_size); 256 } 257 258 void symbols__delete(struct rb_root *symbols) 259 { 260 struct symbol *pos; 261 struct rb_node *next = rb_first(symbols); 262 263 while (next) { 264 pos = rb_entry(next, struct symbol, rb_node); 265 next = rb_next(&pos->rb_node); 266 rb_erase(&pos->rb_node, symbols); 267 symbol__delete(pos); 268 } 269 } 270 271 void symbols__insert(struct rb_root *symbols, struct symbol *sym) 272 { 273 struct rb_node **p = &symbols->rb_node; 274 struct rb_node *parent = NULL; 275 const u64 ip = sym->start; 276 struct symbol *s; 277 278 while (*p != NULL) { 279 parent = *p; 280 s = rb_entry(parent, struct symbol, rb_node); 281 if (ip < s->start) 282 p = &(*p)->rb_left; 283 else 284 p = &(*p)->rb_right; 285 } 286 rb_link_node(&sym->rb_node, parent, p); 287 rb_insert_color(&sym->rb_node, symbols); 288 } 289 290 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip) 291 { 292 struct rb_node *n; 293 294 if (symbols == NULL) 295 return NULL; 296 297 n = symbols->rb_node; 298 299 while (n) { 300 struct symbol *s = rb_entry(n, struct symbol, rb_node); 301 302 if (ip < s->start) 303 n = n->rb_left; 304 else if (ip > s->end || (ip == s->end && ip != s->start)) 305 n = n->rb_right; 306 else 307 return s; 308 } 309 310 return NULL; 311 } 312 313 static struct symbol *symbols__first(struct rb_root *symbols) 314 { 315 struct rb_node *n = rb_first(symbols); 316 317 if (n) 318 return rb_entry(n, struct symbol, rb_node); 319 320 return NULL; 321 } 322 323 static struct symbol *symbols__next(struct symbol *sym) 324 { 325 struct rb_node *n = rb_next(&sym->rb_node); 326 327 if (n) 328 return rb_entry(n, struct symbol, rb_node); 329 330 return NULL; 331 } 332 333 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym) 334 { 335 struct rb_node **p = &symbols->rb_node; 336 struct rb_node *parent = NULL; 337 struct symbol_name_rb_node *symn, *s; 338 339 symn = container_of(sym, struct symbol_name_rb_node, sym); 340 341 while (*p != NULL) { 342 parent = *p; 343 s = rb_entry(parent, struct symbol_name_rb_node, rb_node); 344 if (strcmp(sym->name, s->sym.name) < 0) 345 p = &(*p)->rb_left; 346 else 347 p = &(*p)->rb_right; 348 } 349 rb_link_node(&symn->rb_node, parent, p); 350 rb_insert_color(&symn->rb_node, symbols); 351 } 352 353 static void symbols__sort_by_name(struct rb_root *symbols, 354 struct rb_root *source) 355 { 356 struct rb_node *nd; 357 358 for (nd = rb_first(source); nd; nd = rb_next(nd)) { 359 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 360 symbols__insert_by_name(symbols, pos); 361 } 362 } 363 364 static struct symbol *symbols__find_by_name(struct rb_root *symbols, 365 const char *name) 366 { 367 struct rb_node *n; 368 struct symbol_name_rb_node *s = NULL; 369 370 if (symbols == NULL) 371 return NULL; 372 373 n = symbols->rb_node; 374 375 while (n) { 376 int cmp; 377 378 s = rb_entry(n, struct symbol_name_rb_node, rb_node); 379 cmp = arch__compare_symbol_names(name, s->sym.name); 380 381 if (cmp < 0) 382 n = n->rb_left; 383 else if (cmp > 0) 384 n = n->rb_right; 385 else 386 break; 387 } 388 389 if (n == NULL) 390 return NULL; 391 392 /* return first symbol that has same name (if any) */ 393 for (n = rb_prev(n); n; n = rb_prev(n)) { 394 struct symbol_name_rb_node *tmp; 395 396 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node); 397 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name)) 398 break; 399 400 s = tmp; 401 } 402 403 return &s->sym; 404 } 405 406 void dso__reset_find_symbol_cache(struct dso *dso) 407 { 408 enum map_type type; 409 410 for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) { 411 dso->last_find_result[type].addr = 0; 412 dso->last_find_result[type].symbol = NULL; 413 } 414 } 415 416 void dso__insert_symbol(struct dso *dso, enum map_type type, struct symbol *sym) 417 { 418 symbols__insert(&dso->symbols[type], sym); 419 420 /* update the symbol cache if necessary */ 421 if (dso->last_find_result[type].addr >= sym->start && 422 (dso->last_find_result[type].addr < sym->end || 423 sym->start == sym->end)) { 424 dso->last_find_result[type].symbol = sym; 425 } 426 } 427 428 struct symbol *dso__find_symbol(struct dso *dso, 429 enum map_type type, u64 addr) 430 { 431 if (dso->last_find_result[type].addr != addr) { 432 dso->last_find_result[type].addr = addr; 433 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr); 434 } 435 436 return dso->last_find_result[type].symbol; 437 } 438 439 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type) 440 { 441 return symbols__first(&dso->symbols[type]); 442 } 443 444 struct symbol *dso__next_symbol(struct symbol *sym) 445 { 446 return symbols__next(sym); 447 } 448 449 struct symbol *symbol__next_by_name(struct symbol *sym) 450 { 451 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym); 452 struct rb_node *n = rb_next(&s->rb_node); 453 454 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL; 455 } 456 457 /* 458 * Teturns first symbol that matched with @name. 459 */ 460 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type, 461 const char *name) 462 { 463 return symbols__find_by_name(&dso->symbol_names[type], name); 464 } 465 466 void dso__sort_by_name(struct dso *dso, enum map_type type) 467 { 468 dso__set_sorted_by_name(dso, type); 469 return symbols__sort_by_name(&dso->symbol_names[type], 470 &dso->symbols[type]); 471 } 472 473 int modules__parse(const char *filename, void *arg, 474 int (*process_module)(void *arg, const char *name, 475 u64 start)) 476 { 477 char *line = NULL; 478 size_t n; 479 FILE *file; 480 int err = 0; 481 482 file = fopen(filename, "r"); 483 if (file == NULL) 484 return -1; 485 486 while (1) { 487 char name[PATH_MAX]; 488 u64 start; 489 char *sep; 490 ssize_t line_len; 491 492 line_len = getline(&line, &n, file); 493 if (line_len < 0) { 494 if (feof(file)) 495 break; 496 err = -1; 497 goto out; 498 } 499 500 if (!line) { 501 err = -1; 502 goto out; 503 } 504 505 line[--line_len] = '\0'; /* \n */ 506 507 sep = strrchr(line, 'x'); 508 if (sep == NULL) 509 continue; 510 511 hex2u64(sep + 1, &start); 512 513 sep = strchr(line, ' '); 514 if (sep == NULL) 515 continue; 516 517 *sep = '\0'; 518 519 scnprintf(name, sizeof(name), "[%s]", line); 520 521 err = process_module(arg, name, start); 522 if (err) 523 break; 524 } 525 out: 526 free(line); 527 fclose(file); 528 return err; 529 } 530 531 struct process_kallsyms_args { 532 struct map *map; 533 struct dso *dso; 534 }; 535 536 /* 537 * These are symbols in the kernel image, so make sure that 538 * sym is from a kernel DSO. 539 */ 540 bool symbol__is_idle(struct symbol *sym) 541 { 542 const char * const idle_symbols[] = { 543 "cpu_idle", 544 "cpu_startup_entry", 545 "intel_idle", 546 "default_idle", 547 "native_safe_halt", 548 "enter_idle", 549 "exit_idle", 550 "mwait_idle", 551 "mwait_idle_with_hints", 552 "poll_idle", 553 "ppc64_runlatch_off", 554 "pseries_dedicated_idle_sleep", 555 NULL 556 }; 557 558 int i; 559 560 if (!sym) 561 return false; 562 563 for (i = 0; idle_symbols[i]; i++) { 564 if (!strcmp(idle_symbols[i], sym->name)) 565 return true; 566 } 567 568 return false; 569 } 570 571 static int map__process_kallsym_symbol(void *arg, const char *name, 572 char type, u64 start) 573 { 574 struct symbol *sym; 575 struct process_kallsyms_args *a = arg; 576 struct rb_root *root = &a->dso->symbols[a->map->type]; 577 578 if (!symbol_type__is_a(type, a->map->type)) 579 return 0; 580 581 /* 582 * module symbols are not sorted so we add all 583 * symbols, setting length to 0, and rely on 584 * symbols__fixup_end() to fix it up. 585 */ 586 sym = symbol__new(start, 0, kallsyms2elf_binding(type), name); 587 if (sym == NULL) 588 return -ENOMEM; 589 /* 590 * We will pass the symbols to the filter later, in 591 * map__split_kallsyms, when we have split the maps per module 592 */ 593 symbols__insert(root, sym); 594 595 return 0; 596 } 597 598 /* 599 * Loads the function entries in /proc/kallsyms into kernel_map->dso, 600 * so that we can in the next step set the symbol ->end address and then 601 * call kernel_maps__split_kallsyms. 602 */ 603 static int dso__load_all_kallsyms(struct dso *dso, const char *filename, 604 struct map *map) 605 { 606 struct process_kallsyms_args args = { .map = map, .dso = dso, }; 607 return kallsyms__parse(filename, &args, map__process_kallsym_symbol); 608 } 609 610 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map, 611 symbol_filter_t filter) 612 { 613 struct map_groups *kmaps = map__kmaps(map); 614 struct map *curr_map; 615 struct symbol *pos; 616 int count = 0; 617 struct rb_root old_root = dso->symbols[map->type]; 618 struct rb_root *root = &dso->symbols[map->type]; 619 struct rb_node *next = rb_first(root); 620 621 if (!kmaps) 622 return -1; 623 624 *root = RB_ROOT; 625 626 while (next) { 627 char *module; 628 629 pos = rb_entry(next, struct symbol, rb_node); 630 next = rb_next(&pos->rb_node); 631 632 rb_erase_init(&pos->rb_node, &old_root); 633 634 module = strchr(pos->name, '\t'); 635 if (module) 636 *module = '\0'; 637 638 curr_map = map_groups__find(kmaps, map->type, pos->start); 639 640 if (!curr_map || (filter && filter(curr_map, pos))) { 641 symbol__delete(pos); 642 continue; 643 } 644 645 pos->start -= curr_map->start - curr_map->pgoff; 646 if (pos->end) 647 pos->end -= curr_map->start - curr_map->pgoff; 648 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); 649 ++count; 650 } 651 652 /* Symbols have been adjusted */ 653 dso->adjust_symbols = 1; 654 655 return count; 656 } 657 658 /* 659 * Split the symbols into maps, making sure there are no overlaps, i.e. the 660 * kernel range is broken in several maps, named [kernel].N, as we don't have 661 * the original ELF section names vmlinux have. 662 */ 663 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta, 664 symbol_filter_t filter) 665 { 666 struct map_groups *kmaps = map__kmaps(map); 667 struct machine *machine; 668 struct map *curr_map = map; 669 struct symbol *pos; 670 int count = 0, moved = 0; 671 struct rb_root *root = &dso->symbols[map->type]; 672 struct rb_node *next = rb_first(root); 673 int kernel_range = 0; 674 675 if (!kmaps) 676 return -1; 677 678 machine = kmaps->machine; 679 680 while (next) { 681 char *module; 682 683 pos = rb_entry(next, struct symbol, rb_node); 684 next = rb_next(&pos->rb_node); 685 686 module = strchr(pos->name, '\t'); 687 if (module) { 688 if (!symbol_conf.use_modules) 689 goto discard_symbol; 690 691 *module++ = '\0'; 692 693 if (strcmp(curr_map->dso->short_name, module)) { 694 if (curr_map != map && 695 dso->kernel == DSO_TYPE_GUEST_KERNEL && 696 machine__is_default_guest(machine)) { 697 /* 698 * We assume all symbols of a module are 699 * continuous in * kallsyms, so curr_map 700 * points to a module and all its 701 * symbols are in its kmap. Mark it as 702 * loaded. 703 */ 704 dso__set_loaded(curr_map->dso, 705 curr_map->type); 706 } 707 708 curr_map = map_groups__find_by_name(kmaps, 709 map->type, module); 710 if (curr_map == NULL) { 711 pr_debug("%s/proc/{kallsyms,modules} " 712 "inconsistency while looking " 713 "for \"%s\" module!\n", 714 machine->root_dir, module); 715 curr_map = map; 716 goto discard_symbol; 717 } 718 719 if (curr_map->dso->loaded && 720 !machine__is_default_guest(machine)) 721 goto discard_symbol; 722 } 723 /* 724 * So that we look just like we get from .ko files, 725 * i.e. not prelinked, relative to map->start. 726 */ 727 pos->start = curr_map->map_ip(curr_map, pos->start); 728 pos->end = curr_map->map_ip(curr_map, pos->end); 729 } else if (curr_map != map) { 730 char dso_name[PATH_MAX]; 731 struct dso *ndso; 732 733 if (delta) { 734 /* Kernel was relocated at boot time */ 735 pos->start -= delta; 736 pos->end -= delta; 737 } 738 739 if (count == 0) { 740 curr_map = map; 741 goto filter_symbol; 742 } 743 744 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 745 snprintf(dso_name, sizeof(dso_name), 746 "[guest.kernel].%d", 747 kernel_range++); 748 else 749 snprintf(dso_name, sizeof(dso_name), 750 "[kernel].%d", 751 kernel_range++); 752 753 ndso = dso__new(dso_name); 754 if (ndso == NULL) 755 return -1; 756 757 ndso->kernel = dso->kernel; 758 759 curr_map = map__new2(pos->start, ndso, map->type); 760 if (curr_map == NULL) { 761 dso__put(ndso); 762 return -1; 763 } 764 765 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; 766 map_groups__insert(kmaps, curr_map); 767 ++kernel_range; 768 } else if (delta) { 769 /* Kernel was relocated at boot time */ 770 pos->start -= delta; 771 pos->end -= delta; 772 } 773 filter_symbol: 774 if (filter && filter(curr_map, pos)) { 775 discard_symbol: rb_erase(&pos->rb_node, root); 776 symbol__delete(pos); 777 } else { 778 if (curr_map != map) { 779 rb_erase(&pos->rb_node, root); 780 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); 781 ++moved; 782 } else 783 ++count; 784 } 785 } 786 787 if (curr_map != map && 788 dso->kernel == DSO_TYPE_GUEST_KERNEL && 789 machine__is_default_guest(kmaps->machine)) { 790 dso__set_loaded(curr_map->dso, curr_map->type); 791 } 792 793 return count + moved; 794 } 795 796 bool symbol__restricted_filename(const char *filename, 797 const char *restricted_filename) 798 { 799 bool restricted = false; 800 801 if (symbol_conf.kptr_restrict) { 802 char *r = realpath(filename, NULL); 803 804 if (r != NULL) { 805 restricted = strcmp(r, restricted_filename) == 0; 806 free(r); 807 return restricted; 808 } 809 } 810 811 return restricted; 812 } 813 814 struct module_info { 815 struct rb_node rb_node; 816 char *name; 817 u64 start; 818 }; 819 820 static void add_module(struct module_info *mi, struct rb_root *modules) 821 { 822 struct rb_node **p = &modules->rb_node; 823 struct rb_node *parent = NULL; 824 struct module_info *m; 825 826 while (*p != NULL) { 827 parent = *p; 828 m = rb_entry(parent, struct module_info, rb_node); 829 if (strcmp(mi->name, m->name) < 0) 830 p = &(*p)->rb_left; 831 else 832 p = &(*p)->rb_right; 833 } 834 rb_link_node(&mi->rb_node, parent, p); 835 rb_insert_color(&mi->rb_node, modules); 836 } 837 838 static void delete_modules(struct rb_root *modules) 839 { 840 struct module_info *mi; 841 struct rb_node *next = rb_first(modules); 842 843 while (next) { 844 mi = rb_entry(next, struct module_info, rb_node); 845 next = rb_next(&mi->rb_node); 846 rb_erase(&mi->rb_node, modules); 847 zfree(&mi->name); 848 free(mi); 849 } 850 } 851 852 static struct module_info *find_module(const char *name, 853 struct rb_root *modules) 854 { 855 struct rb_node *n = modules->rb_node; 856 857 while (n) { 858 struct module_info *m; 859 int cmp; 860 861 m = rb_entry(n, struct module_info, rb_node); 862 cmp = strcmp(name, m->name); 863 if (cmp < 0) 864 n = n->rb_left; 865 else if (cmp > 0) 866 n = n->rb_right; 867 else 868 return m; 869 } 870 871 return NULL; 872 } 873 874 static int __read_proc_modules(void *arg, const char *name, u64 start) 875 { 876 struct rb_root *modules = arg; 877 struct module_info *mi; 878 879 mi = zalloc(sizeof(struct module_info)); 880 if (!mi) 881 return -ENOMEM; 882 883 mi->name = strdup(name); 884 mi->start = start; 885 886 if (!mi->name) { 887 free(mi); 888 return -ENOMEM; 889 } 890 891 add_module(mi, modules); 892 893 return 0; 894 } 895 896 static int read_proc_modules(const char *filename, struct rb_root *modules) 897 { 898 if (symbol__restricted_filename(filename, "/proc/modules")) 899 return -1; 900 901 if (modules__parse(filename, modules, __read_proc_modules)) { 902 delete_modules(modules); 903 return -1; 904 } 905 906 return 0; 907 } 908 909 int compare_proc_modules(const char *from, const char *to) 910 { 911 struct rb_root from_modules = RB_ROOT; 912 struct rb_root to_modules = RB_ROOT; 913 struct rb_node *from_node, *to_node; 914 struct module_info *from_m, *to_m; 915 int ret = -1; 916 917 if (read_proc_modules(from, &from_modules)) 918 return -1; 919 920 if (read_proc_modules(to, &to_modules)) 921 goto out_delete_from; 922 923 from_node = rb_first(&from_modules); 924 to_node = rb_first(&to_modules); 925 while (from_node) { 926 if (!to_node) 927 break; 928 929 from_m = rb_entry(from_node, struct module_info, rb_node); 930 to_m = rb_entry(to_node, struct module_info, rb_node); 931 932 if (from_m->start != to_m->start || 933 strcmp(from_m->name, to_m->name)) 934 break; 935 936 from_node = rb_next(from_node); 937 to_node = rb_next(to_node); 938 } 939 940 if (!from_node && !to_node) 941 ret = 0; 942 943 delete_modules(&to_modules); 944 out_delete_from: 945 delete_modules(&from_modules); 946 947 return ret; 948 } 949 950 static int do_validate_kcore_modules(const char *filename, struct map *map, 951 struct map_groups *kmaps) 952 { 953 struct rb_root modules = RB_ROOT; 954 struct map *old_map; 955 int err; 956 957 err = read_proc_modules(filename, &modules); 958 if (err) 959 return err; 960 961 old_map = map_groups__first(kmaps, map->type); 962 while (old_map) { 963 struct map *next = map_groups__next(old_map); 964 struct module_info *mi; 965 966 if (old_map == map || old_map->start == map->start) { 967 /* The kernel map */ 968 old_map = next; 969 continue; 970 } 971 972 /* Module must be in memory at the same address */ 973 mi = find_module(old_map->dso->short_name, &modules); 974 if (!mi || mi->start != old_map->start) { 975 err = -EINVAL; 976 goto out; 977 } 978 979 old_map = next; 980 } 981 out: 982 delete_modules(&modules); 983 return err; 984 } 985 986 /* 987 * If kallsyms is referenced by name then we look for filename in the same 988 * directory. 989 */ 990 static bool filename_from_kallsyms_filename(char *filename, 991 const char *base_name, 992 const char *kallsyms_filename) 993 { 994 char *name; 995 996 strcpy(filename, kallsyms_filename); 997 name = strrchr(filename, '/'); 998 if (!name) 999 return false; 1000 1001 name += 1; 1002 1003 if (!strcmp(name, "kallsyms")) { 1004 strcpy(name, base_name); 1005 return true; 1006 } 1007 1008 return false; 1009 } 1010 1011 static int validate_kcore_modules(const char *kallsyms_filename, 1012 struct map *map) 1013 { 1014 struct map_groups *kmaps = map__kmaps(map); 1015 char modules_filename[PATH_MAX]; 1016 1017 if (!kmaps) 1018 return -EINVAL; 1019 1020 if (!filename_from_kallsyms_filename(modules_filename, "modules", 1021 kallsyms_filename)) 1022 return -EINVAL; 1023 1024 if (do_validate_kcore_modules(modules_filename, map, kmaps)) 1025 return -EINVAL; 1026 1027 return 0; 1028 } 1029 1030 static int validate_kcore_addresses(const char *kallsyms_filename, 1031 struct map *map) 1032 { 1033 struct kmap *kmap = map__kmap(map); 1034 1035 if (!kmap) 1036 return -EINVAL; 1037 1038 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) { 1039 u64 start; 1040 1041 start = kallsyms__get_function_start(kallsyms_filename, 1042 kmap->ref_reloc_sym->name); 1043 if (start != kmap->ref_reloc_sym->addr) 1044 return -EINVAL; 1045 } 1046 1047 return validate_kcore_modules(kallsyms_filename, map); 1048 } 1049 1050 struct kcore_mapfn_data { 1051 struct dso *dso; 1052 enum map_type type; 1053 struct list_head maps; 1054 }; 1055 1056 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) 1057 { 1058 struct kcore_mapfn_data *md = data; 1059 struct map *map; 1060 1061 map = map__new2(start, md->dso, md->type); 1062 if (map == NULL) 1063 return -ENOMEM; 1064 1065 map->end = map->start + len; 1066 map->pgoff = pgoff; 1067 1068 list_add(&map->node, &md->maps); 1069 1070 return 0; 1071 } 1072 1073 static int dso__load_kcore(struct dso *dso, struct map *map, 1074 const char *kallsyms_filename) 1075 { 1076 struct map_groups *kmaps = map__kmaps(map); 1077 struct machine *machine; 1078 struct kcore_mapfn_data md; 1079 struct map *old_map, *new_map, *replacement_map = NULL; 1080 bool is_64_bit; 1081 int err, fd; 1082 char kcore_filename[PATH_MAX]; 1083 struct symbol *sym; 1084 1085 if (!kmaps) 1086 return -EINVAL; 1087 1088 machine = kmaps->machine; 1089 1090 /* This function requires that the map is the kernel map */ 1091 if (map != machine->vmlinux_maps[map->type]) 1092 return -EINVAL; 1093 1094 if (!filename_from_kallsyms_filename(kcore_filename, "kcore", 1095 kallsyms_filename)) 1096 return -EINVAL; 1097 1098 /* Modules and kernel must be present at their original addresses */ 1099 if (validate_kcore_addresses(kallsyms_filename, map)) 1100 return -EINVAL; 1101 1102 md.dso = dso; 1103 md.type = map->type; 1104 INIT_LIST_HEAD(&md.maps); 1105 1106 fd = open(kcore_filename, O_RDONLY); 1107 if (fd < 0) { 1108 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n", 1109 kcore_filename); 1110 return -EINVAL; 1111 } 1112 1113 /* Read new maps into temporary lists */ 1114 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md, 1115 &is_64_bit); 1116 if (err) 1117 goto out_err; 1118 dso->is_64_bit = is_64_bit; 1119 1120 if (list_empty(&md.maps)) { 1121 err = -EINVAL; 1122 goto out_err; 1123 } 1124 1125 /* Remove old maps */ 1126 old_map = map_groups__first(kmaps, map->type); 1127 while (old_map) { 1128 struct map *next = map_groups__next(old_map); 1129 1130 if (old_map != map) 1131 map_groups__remove(kmaps, old_map); 1132 old_map = next; 1133 } 1134 1135 /* Find the kernel map using the first symbol */ 1136 sym = dso__first_symbol(dso, map->type); 1137 list_for_each_entry(new_map, &md.maps, node) { 1138 if (sym && sym->start >= new_map->start && 1139 sym->start < new_map->end) { 1140 replacement_map = new_map; 1141 break; 1142 } 1143 } 1144 1145 if (!replacement_map) 1146 replacement_map = list_entry(md.maps.next, struct map, node); 1147 1148 /* Add new maps */ 1149 while (!list_empty(&md.maps)) { 1150 new_map = list_entry(md.maps.next, struct map, node); 1151 list_del_init(&new_map->node); 1152 if (new_map == replacement_map) { 1153 map->start = new_map->start; 1154 map->end = new_map->end; 1155 map->pgoff = new_map->pgoff; 1156 map->map_ip = new_map->map_ip; 1157 map->unmap_ip = new_map->unmap_ip; 1158 /* Ensure maps are correctly ordered */ 1159 map__get(map); 1160 map_groups__remove(kmaps, map); 1161 map_groups__insert(kmaps, map); 1162 map__put(map); 1163 } else { 1164 map_groups__insert(kmaps, new_map); 1165 } 1166 1167 map__put(new_map); 1168 } 1169 1170 /* 1171 * Set the data type and long name so that kcore can be read via 1172 * dso__data_read_addr(). 1173 */ 1174 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1175 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE; 1176 else 1177 dso->binary_type = DSO_BINARY_TYPE__KCORE; 1178 dso__set_long_name(dso, strdup(kcore_filename), true); 1179 1180 close(fd); 1181 1182 if (map->type == MAP__FUNCTION) 1183 pr_debug("Using %s for kernel object code\n", kcore_filename); 1184 else 1185 pr_debug("Using %s for kernel data\n", kcore_filename); 1186 1187 return 0; 1188 1189 out_err: 1190 while (!list_empty(&md.maps)) { 1191 map = list_entry(md.maps.next, struct map, node); 1192 list_del_init(&map->node); 1193 map__put(map); 1194 } 1195 close(fd); 1196 return -EINVAL; 1197 } 1198 1199 /* 1200 * If the kernel is relocated at boot time, kallsyms won't match. Compute the 1201 * delta based on the relocation reference symbol. 1202 */ 1203 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta) 1204 { 1205 struct kmap *kmap = map__kmap(map); 1206 u64 addr; 1207 1208 if (!kmap) 1209 return -1; 1210 1211 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) 1212 return 0; 1213 1214 addr = kallsyms__get_function_start(filename, 1215 kmap->ref_reloc_sym->name); 1216 if (!addr) 1217 return -1; 1218 1219 *delta = addr - kmap->ref_reloc_sym->addr; 1220 return 0; 1221 } 1222 1223 int __dso__load_kallsyms(struct dso *dso, const char *filename, 1224 struct map *map, bool no_kcore, symbol_filter_t filter) 1225 { 1226 u64 delta = 0; 1227 1228 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 1229 return -1; 1230 1231 if (dso__load_all_kallsyms(dso, filename, map) < 0) 1232 return -1; 1233 1234 if (kallsyms__delta(map, filename, &delta)) 1235 return -1; 1236 1237 symbols__fixup_duplicate(&dso->symbols[map->type]); 1238 symbols__fixup_end(&dso->symbols[map->type]); 1239 1240 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1241 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1242 else 1243 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; 1244 1245 if (!no_kcore && !dso__load_kcore(dso, map, filename)) 1246 return dso__split_kallsyms_for_kcore(dso, map, filter); 1247 else 1248 return dso__split_kallsyms(dso, map, delta, filter); 1249 } 1250 1251 int dso__load_kallsyms(struct dso *dso, const char *filename, 1252 struct map *map, symbol_filter_t filter) 1253 { 1254 return __dso__load_kallsyms(dso, filename, map, false, filter); 1255 } 1256 1257 static int dso__load_perf_map(struct dso *dso, struct map *map, 1258 symbol_filter_t filter) 1259 { 1260 char *line = NULL; 1261 size_t n; 1262 FILE *file; 1263 int nr_syms = 0; 1264 1265 file = fopen(dso->long_name, "r"); 1266 if (file == NULL) 1267 goto out_failure; 1268 1269 while (!feof(file)) { 1270 u64 start, size; 1271 struct symbol *sym; 1272 int line_len, len; 1273 1274 line_len = getline(&line, &n, file); 1275 if (line_len < 0) 1276 break; 1277 1278 if (!line) 1279 goto out_failure; 1280 1281 line[--line_len] = '\0'; /* \n */ 1282 1283 len = hex2u64(line, &start); 1284 1285 len++; 1286 if (len + 2 >= line_len) 1287 continue; 1288 1289 len += hex2u64(line + len, &size); 1290 1291 len++; 1292 if (len + 2 >= line_len) 1293 continue; 1294 1295 sym = symbol__new(start, size, STB_GLOBAL, line + len); 1296 1297 if (sym == NULL) 1298 goto out_delete_line; 1299 1300 if (filter && filter(map, sym)) 1301 symbol__delete(sym); 1302 else { 1303 symbols__insert(&dso->symbols[map->type], sym); 1304 nr_syms++; 1305 } 1306 } 1307 1308 free(line); 1309 fclose(file); 1310 1311 return nr_syms; 1312 1313 out_delete_line: 1314 free(line); 1315 out_failure: 1316 return -1; 1317 } 1318 1319 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, 1320 enum dso_binary_type type) 1321 { 1322 switch (type) { 1323 case DSO_BINARY_TYPE__JAVA_JIT: 1324 case DSO_BINARY_TYPE__DEBUGLINK: 1325 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO: 1326 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO: 1327 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO: 1328 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO: 1329 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: 1330 return !kmod && dso->kernel == DSO_TYPE_USER; 1331 1332 case DSO_BINARY_TYPE__KALLSYMS: 1333 case DSO_BINARY_TYPE__VMLINUX: 1334 case DSO_BINARY_TYPE__KCORE: 1335 return dso->kernel == DSO_TYPE_KERNEL; 1336 1337 case DSO_BINARY_TYPE__GUEST_KALLSYMS: 1338 case DSO_BINARY_TYPE__GUEST_VMLINUX: 1339 case DSO_BINARY_TYPE__GUEST_KCORE: 1340 return dso->kernel == DSO_TYPE_GUEST_KERNEL; 1341 1342 case DSO_BINARY_TYPE__GUEST_KMODULE: 1343 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP: 1344 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE: 1345 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP: 1346 /* 1347 * kernel modules know their symtab type - it's set when 1348 * creating a module dso in machine__findnew_module_map(). 1349 */ 1350 return kmod && dso->symtab_type == type; 1351 1352 case DSO_BINARY_TYPE__BUILD_ID_CACHE: 1353 return true; 1354 1355 case DSO_BINARY_TYPE__NOT_FOUND: 1356 default: 1357 return false; 1358 } 1359 } 1360 1361 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) 1362 { 1363 char *name; 1364 int ret = -1; 1365 u_int i; 1366 struct machine *machine; 1367 char *root_dir = (char *) ""; 1368 int ss_pos = 0; 1369 struct symsrc ss_[2]; 1370 struct symsrc *syms_ss = NULL, *runtime_ss = NULL; 1371 bool kmod; 1372 unsigned char build_id[BUILD_ID_SIZE]; 1373 1374 pthread_mutex_lock(&dso->lock); 1375 1376 /* check again under the dso->lock */ 1377 if (dso__loaded(dso, map->type)) { 1378 ret = 1; 1379 goto out; 1380 } 1381 1382 if (dso->kernel) { 1383 if (dso->kernel == DSO_TYPE_KERNEL) 1384 ret = dso__load_kernel_sym(dso, map, filter); 1385 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1386 ret = dso__load_guest_kernel_sym(dso, map, filter); 1387 1388 goto out; 1389 } 1390 1391 if (map->groups && map->groups->machine) 1392 machine = map->groups->machine; 1393 else 1394 machine = NULL; 1395 1396 dso->adjust_symbols = 0; 1397 1398 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) { 1399 struct stat st; 1400 1401 if (lstat(dso->name, &st) < 0) 1402 goto out; 1403 1404 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) { 1405 pr_warning("File %s not owned by current user or root, " 1406 "ignoring it (use -f to override).\n", dso->name); 1407 goto out; 1408 } 1409 1410 ret = dso__load_perf_map(dso, map, filter); 1411 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : 1412 DSO_BINARY_TYPE__NOT_FOUND; 1413 goto out; 1414 } 1415 1416 if (machine) 1417 root_dir = machine->root_dir; 1418 1419 name = malloc(PATH_MAX); 1420 if (!name) 1421 goto out; 1422 1423 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || 1424 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP || 1425 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || 1426 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; 1427 1428 1429 /* 1430 * Read the build id if possible. This is required for 1431 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work 1432 */ 1433 if (is_regular_file(name) && 1434 filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0) 1435 dso__set_build_id(dso, build_id); 1436 1437 /* 1438 * Iterate over candidate debug images. 1439 * Keep track of "interesting" ones (those which have a symtab, dynsym, 1440 * and/or opd section) for processing. 1441 */ 1442 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { 1443 struct symsrc *ss = &ss_[ss_pos]; 1444 bool next_slot = false; 1445 1446 enum dso_binary_type symtab_type = binary_type_symtab[i]; 1447 1448 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type)) 1449 continue; 1450 1451 if (dso__read_binary_type_filename(dso, symtab_type, 1452 root_dir, name, PATH_MAX)) 1453 continue; 1454 1455 if (!is_regular_file(name)) 1456 continue; 1457 1458 /* Name is now the name of the next image to try */ 1459 if (symsrc__init(ss, dso, name, symtab_type) < 0) 1460 continue; 1461 1462 if (!syms_ss && symsrc__has_symtab(ss)) { 1463 syms_ss = ss; 1464 next_slot = true; 1465 if (!dso->symsrc_filename) 1466 dso->symsrc_filename = strdup(name); 1467 } 1468 1469 if (!runtime_ss && symsrc__possibly_runtime(ss)) { 1470 runtime_ss = ss; 1471 next_slot = true; 1472 } 1473 1474 if (next_slot) { 1475 ss_pos++; 1476 1477 if (syms_ss && runtime_ss) 1478 break; 1479 } else { 1480 symsrc__destroy(ss); 1481 } 1482 1483 } 1484 1485 if (!runtime_ss && !syms_ss) 1486 goto out_free; 1487 1488 if (runtime_ss && !syms_ss) { 1489 syms_ss = runtime_ss; 1490 } 1491 1492 /* We'll have to hope for the best */ 1493 if (!runtime_ss && syms_ss) 1494 runtime_ss = syms_ss; 1495 1496 if (syms_ss && syms_ss->type == DSO_BINARY_TYPE__BUILD_ID_CACHE) 1497 if (dso__build_id_is_kmod(dso, name, PATH_MAX)) 1498 kmod = true; 1499 1500 if (syms_ss) 1501 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod); 1502 else 1503 ret = -1; 1504 1505 if (ret > 0) { 1506 int nr_plt; 1507 1508 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter); 1509 if (nr_plt > 0) 1510 ret += nr_plt; 1511 } 1512 1513 for (; ss_pos > 0; ss_pos--) 1514 symsrc__destroy(&ss_[ss_pos - 1]); 1515 out_free: 1516 free(name); 1517 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) 1518 ret = 0; 1519 out: 1520 dso__set_loaded(dso, map->type); 1521 pthread_mutex_unlock(&dso->lock); 1522 1523 return ret; 1524 } 1525 1526 struct map *map_groups__find_by_name(struct map_groups *mg, 1527 enum map_type type, const char *name) 1528 { 1529 struct maps *maps = &mg->maps[type]; 1530 struct map *map; 1531 1532 pthread_rwlock_rdlock(&maps->lock); 1533 1534 for (map = maps__first(maps); map; map = map__next(map)) { 1535 if (map->dso && strcmp(map->dso->short_name, name) == 0) 1536 goto out_unlock; 1537 } 1538 1539 map = NULL; 1540 1541 out_unlock: 1542 pthread_rwlock_unlock(&maps->lock); 1543 return map; 1544 } 1545 1546 int dso__load_vmlinux(struct dso *dso, struct map *map, 1547 const char *vmlinux, bool vmlinux_allocated, 1548 symbol_filter_t filter) 1549 { 1550 int err = -1; 1551 struct symsrc ss; 1552 char symfs_vmlinux[PATH_MAX]; 1553 enum dso_binary_type symtab_type; 1554 1555 if (vmlinux[0] == '/') 1556 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux); 1557 else 1558 symbol__join_symfs(symfs_vmlinux, vmlinux); 1559 1560 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1561 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1562 else 1563 symtab_type = DSO_BINARY_TYPE__VMLINUX; 1564 1565 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) 1566 return -1; 1567 1568 err = dso__load_sym(dso, map, &ss, &ss, filter, 0); 1569 symsrc__destroy(&ss); 1570 1571 if (err > 0) { 1572 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1573 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1574 else 1575 dso->binary_type = DSO_BINARY_TYPE__VMLINUX; 1576 dso__set_long_name(dso, vmlinux, vmlinux_allocated); 1577 dso__set_loaded(dso, map->type); 1578 pr_debug("Using %s for symbols\n", symfs_vmlinux); 1579 } 1580 1581 return err; 1582 } 1583 1584 int dso__load_vmlinux_path(struct dso *dso, struct map *map, 1585 symbol_filter_t filter) 1586 { 1587 int i, err = 0; 1588 char *filename = NULL; 1589 1590 pr_debug("Looking at the vmlinux_path (%d entries long)\n", 1591 vmlinux_path__nr_entries + 1); 1592 1593 for (i = 0; i < vmlinux_path__nr_entries; ++i) { 1594 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter); 1595 if (err > 0) 1596 goto out; 1597 } 1598 1599 if (!symbol_conf.ignore_vmlinux_buildid) 1600 filename = dso__build_id_filename(dso, NULL, 0); 1601 if (filename != NULL) { 1602 err = dso__load_vmlinux(dso, map, filename, true, filter); 1603 if (err > 0) 1604 goto out; 1605 free(filename); 1606 } 1607 out: 1608 return err; 1609 } 1610 1611 static bool visible_dir_filter(const char *name, struct dirent *d) 1612 { 1613 if (d->d_type != DT_DIR) 1614 return false; 1615 return lsdir_no_dot_filter(name, d); 1616 } 1617 1618 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) 1619 { 1620 char kallsyms_filename[PATH_MAX]; 1621 int ret = -1; 1622 struct strlist *dirs; 1623 struct str_node *nd; 1624 1625 dirs = lsdir(dir, visible_dir_filter); 1626 if (!dirs) 1627 return -1; 1628 1629 strlist__for_each(nd, dirs) { 1630 scnprintf(kallsyms_filename, sizeof(kallsyms_filename), 1631 "%s/%s/kallsyms", dir, nd->s); 1632 if (!validate_kcore_addresses(kallsyms_filename, map)) { 1633 strlcpy(dir, kallsyms_filename, dir_sz); 1634 ret = 0; 1635 break; 1636 } 1637 } 1638 1639 strlist__delete(dirs); 1640 1641 return ret; 1642 } 1643 1644 static char *dso__find_kallsyms(struct dso *dso, struct map *map) 1645 { 1646 u8 host_build_id[BUILD_ID_SIZE]; 1647 char sbuild_id[SBUILD_ID_SIZE]; 1648 bool is_host = false; 1649 char path[PATH_MAX]; 1650 1651 if (!dso->has_build_id) { 1652 /* 1653 * Last resort, if we don't have a build-id and couldn't find 1654 * any vmlinux file, try the running kernel kallsyms table. 1655 */ 1656 goto proc_kallsyms; 1657 } 1658 1659 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id, 1660 sizeof(host_build_id)) == 0) 1661 is_host = dso__build_id_equal(dso, host_build_id); 1662 1663 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); 1664 1665 scnprintf(path, sizeof(path), "%s/%s/%s", buildid_dir, 1666 DSO__NAME_KCORE, sbuild_id); 1667 1668 /* Use /proc/kallsyms if possible */ 1669 if (is_host) { 1670 DIR *d; 1671 int fd; 1672 1673 /* If no cached kcore go with /proc/kallsyms */ 1674 d = opendir(path); 1675 if (!d) 1676 goto proc_kallsyms; 1677 closedir(d); 1678 1679 /* 1680 * Do not check the build-id cache, until we know we cannot use 1681 * /proc/kcore. 1682 */ 1683 fd = open("/proc/kcore", O_RDONLY); 1684 if (fd != -1) { 1685 close(fd); 1686 /* If module maps match go with /proc/kallsyms */ 1687 if (!validate_kcore_addresses("/proc/kallsyms", map)) 1688 goto proc_kallsyms; 1689 } 1690 1691 /* Find kallsyms in build-id cache with kcore */ 1692 if (!find_matching_kcore(map, path, sizeof(path))) 1693 return strdup(path); 1694 1695 goto proc_kallsyms; 1696 } 1697 1698 /* Find kallsyms in build-id cache with kcore */ 1699 if (!find_matching_kcore(map, path, sizeof(path))) 1700 return strdup(path); 1701 1702 scnprintf(path, sizeof(path), "%s/%s/%s", 1703 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); 1704 1705 if (access(path, F_OK)) { 1706 pr_err("No kallsyms or vmlinux with build-id %s was found\n", 1707 sbuild_id); 1708 return NULL; 1709 } 1710 1711 return strdup(path); 1712 1713 proc_kallsyms: 1714 return strdup("/proc/kallsyms"); 1715 } 1716 1717 static int dso__load_kernel_sym(struct dso *dso, struct map *map, 1718 symbol_filter_t filter) 1719 { 1720 int err; 1721 const char *kallsyms_filename = NULL; 1722 char *kallsyms_allocated_filename = NULL; 1723 /* 1724 * Step 1: if the user specified a kallsyms or vmlinux filename, use 1725 * it and only it, reporting errors to the user if it cannot be used. 1726 * 1727 * For instance, try to analyse an ARM perf.data file _without_ a 1728 * build-id, or if the user specifies the wrong path to the right 1729 * vmlinux file, obviously we can't fallback to another vmlinux (a 1730 * x86_86 one, on the machine where analysis is being performed, say), 1731 * or worse, /proc/kallsyms. 1732 * 1733 * If the specified file _has_ a build-id and there is a build-id 1734 * section in the perf.data file, we will still do the expected 1735 * validation in dso__load_vmlinux and will bail out if they don't 1736 * match. 1737 */ 1738 if (symbol_conf.kallsyms_name != NULL) { 1739 kallsyms_filename = symbol_conf.kallsyms_name; 1740 goto do_kallsyms; 1741 } 1742 1743 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) { 1744 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, 1745 false, filter); 1746 } 1747 1748 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { 1749 err = dso__load_vmlinux_path(dso, map, filter); 1750 if (err > 0) 1751 return err; 1752 } 1753 1754 /* do not try local files if a symfs was given */ 1755 if (symbol_conf.symfs[0] != 0) 1756 return -1; 1757 1758 kallsyms_allocated_filename = dso__find_kallsyms(dso, map); 1759 if (!kallsyms_allocated_filename) 1760 return -1; 1761 1762 kallsyms_filename = kallsyms_allocated_filename; 1763 1764 do_kallsyms: 1765 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1766 if (err > 0) 1767 pr_debug("Using %s for symbols\n", kallsyms_filename); 1768 free(kallsyms_allocated_filename); 1769 1770 if (err > 0 && !dso__is_kcore(dso)) { 1771 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS; 1772 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false); 1773 map__fixup_start(map); 1774 map__fixup_end(map); 1775 } 1776 1777 return err; 1778 } 1779 1780 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, 1781 symbol_filter_t filter) 1782 { 1783 int err; 1784 const char *kallsyms_filename = NULL; 1785 struct machine *machine; 1786 char path[PATH_MAX]; 1787 1788 if (!map->groups) { 1789 pr_debug("Guest kernel map hasn't the point to groups\n"); 1790 return -1; 1791 } 1792 machine = map->groups->machine; 1793 1794 if (machine__is_default_guest(machine)) { 1795 /* 1796 * if the user specified a vmlinux filename, use it and only 1797 * it, reporting errors to the user if it cannot be used. 1798 * Or use file guest_kallsyms inputted by user on commandline 1799 */ 1800 if (symbol_conf.default_guest_vmlinux_name != NULL) { 1801 err = dso__load_vmlinux(dso, map, 1802 symbol_conf.default_guest_vmlinux_name, 1803 false, filter); 1804 return err; 1805 } 1806 1807 kallsyms_filename = symbol_conf.default_guest_kallsyms; 1808 if (!kallsyms_filename) 1809 return -1; 1810 } else { 1811 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 1812 kallsyms_filename = path; 1813 } 1814 1815 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1816 if (err > 0) 1817 pr_debug("Using %s for symbols\n", kallsyms_filename); 1818 if (err > 0 && !dso__is_kcore(dso)) { 1819 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1820 machine__mmap_name(machine, path, sizeof(path)); 1821 dso__set_long_name(dso, strdup(path), true); 1822 map__fixup_start(map); 1823 map__fixup_end(map); 1824 } 1825 1826 return err; 1827 } 1828 1829 static void vmlinux_path__exit(void) 1830 { 1831 while (--vmlinux_path__nr_entries >= 0) 1832 zfree(&vmlinux_path[vmlinux_path__nr_entries]); 1833 vmlinux_path__nr_entries = 0; 1834 1835 zfree(&vmlinux_path); 1836 } 1837 1838 static const char * const vmlinux_paths[] = { 1839 "vmlinux", 1840 "/boot/vmlinux" 1841 }; 1842 1843 static const char * const vmlinux_paths_upd[] = { 1844 "/boot/vmlinux-%s", 1845 "/usr/lib/debug/boot/vmlinux-%s", 1846 "/lib/modules/%s/build/vmlinux", 1847 "/usr/lib/debug/lib/modules/%s/vmlinux", 1848 "/usr/lib/debug/boot/vmlinux-%s.debug" 1849 }; 1850 1851 static int vmlinux_path__add(const char *new_entry) 1852 { 1853 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry); 1854 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1855 return -1; 1856 ++vmlinux_path__nr_entries; 1857 1858 return 0; 1859 } 1860 1861 static int vmlinux_path__init(struct perf_env *env) 1862 { 1863 struct utsname uts; 1864 char bf[PATH_MAX]; 1865 char *kernel_version; 1866 unsigned int i; 1867 1868 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) + 1869 ARRAY_SIZE(vmlinux_paths_upd))); 1870 if (vmlinux_path == NULL) 1871 return -1; 1872 1873 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++) 1874 if (vmlinux_path__add(vmlinux_paths[i]) < 0) 1875 goto out_fail; 1876 1877 /* only try kernel version if no symfs was given */ 1878 if (symbol_conf.symfs[0] != 0) 1879 return 0; 1880 1881 if (env) { 1882 kernel_version = env->os_release; 1883 } else { 1884 if (uname(&uts) < 0) 1885 goto out_fail; 1886 1887 kernel_version = uts.release; 1888 } 1889 1890 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) { 1891 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version); 1892 if (vmlinux_path__add(bf) < 0) 1893 goto out_fail; 1894 } 1895 1896 return 0; 1897 1898 out_fail: 1899 vmlinux_path__exit(); 1900 return -1; 1901 } 1902 1903 int setup_list(struct strlist **list, const char *list_str, 1904 const char *list_name) 1905 { 1906 if (list_str == NULL) 1907 return 0; 1908 1909 *list = strlist__new(list_str, NULL); 1910 if (!*list) { 1911 pr_err("problems parsing %s list\n", list_name); 1912 return -1; 1913 } 1914 1915 symbol_conf.has_filter = true; 1916 return 0; 1917 } 1918 1919 int setup_intlist(struct intlist **list, const char *list_str, 1920 const char *list_name) 1921 { 1922 if (list_str == NULL) 1923 return 0; 1924 1925 *list = intlist__new(list_str); 1926 if (!*list) { 1927 pr_err("problems parsing %s list\n", list_name); 1928 return -1; 1929 } 1930 return 0; 1931 } 1932 1933 static bool symbol__read_kptr_restrict(void) 1934 { 1935 bool value = false; 1936 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); 1937 1938 if (fp != NULL) { 1939 char line[8]; 1940 1941 if (fgets(line, sizeof(line), fp) != NULL) 1942 value = (geteuid() != 0) ? 1943 (atoi(line) != 0) : 1944 (atoi(line) == 2); 1945 1946 fclose(fp); 1947 } 1948 1949 return value; 1950 } 1951 1952 int symbol__init(struct perf_env *env) 1953 { 1954 const char *symfs; 1955 1956 if (symbol_conf.initialized) 1957 return 0; 1958 1959 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); 1960 1961 symbol__elf_init(); 1962 1963 if (symbol_conf.sort_by_name) 1964 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - 1965 sizeof(struct symbol)); 1966 1967 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0) 1968 return -1; 1969 1970 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { 1971 pr_err("'.' is the only non valid --field-separator argument\n"); 1972 return -1; 1973 } 1974 1975 if (setup_list(&symbol_conf.dso_list, 1976 symbol_conf.dso_list_str, "dso") < 0) 1977 return -1; 1978 1979 if (setup_list(&symbol_conf.comm_list, 1980 symbol_conf.comm_list_str, "comm") < 0) 1981 goto out_free_dso_list; 1982 1983 if (setup_intlist(&symbol_conf.pid_list, 1984 symbol_conf.pid_list_str, "pid") < 0) 1985 goto out_free_comm_list; 1986 1987 if (setup_intlist(&symbol_conf.tid_list, 1988 symbol_conf.tid_list_str, "tid") < 0) 1989 goto out_free_pid_list; 1990 1991 if (setup_list(&symbol_conf.sym_list, 1992 symbol_conf.sym_list_str, "symbol") < 0) 1993 goto out_free_tid_list; 1994 1995 /* 1996 * A path to symbols of "/" is identical to "" 1997 * reset here for simplicity. 1998 */ 1999 symfs = realpath(symbol_conf.symfs, NULL); 2000 if (symfs == NULL) 2001 symfs = symbol_conf.symfs; 2002 if (strcmp(symfs, "/") == 0) 2003 symbol_conf.symfs = ""; 2004 if (symfs != symbol_conf.symfs) 2005 free((void *)symfs); 2006 2007 symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); 2008 2009 symbol_conf.initialized = true; 2010 return 0; 2011 2012 out_free_tid_list: 2013 intlist__delete(symbol_conf.tid_list); 2014 out_free_pid_list: 2015 intlist__delete(symbol_conf.pid_list); 2016 out_free_comm_list: 2017 strlist__delete(symbol_conf.comm_list); 2018 out_free_dso_list: 2019 strlist__delete(symbol_conf.dso_list); 2020 return -1; 2021 } 2022 2023 void symbol__exit(void) 2024 { 2025 if (!symbol_conf.initialized) 2026 return; 2027 strlist__delete(symbol_conf.sym_list); 2028 strlist__delete(symbol_conf.dso_list); 2029 strlist__delete(symbol_conf.comm_list); 2030 intlist__delete(symbol_conf.tid_list); 2031 intlist__delete(symbol_conf.pid_list); 2032 vmlinux_path__exit(); 2033 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; 2034 symbol_conf.initialized = false; 2035 } 2036 2037 int symbol__config_symfs(const struct option *opt __maybe_unused, 2038 const char *dir, int unset __maybe_unused) 2039 { 2040 char *bf = NULL; 2041 int ret; 2042 2043 symbol_conf.symfs = strdup(dir); 2044 if (symbol_conf.symfs == NULL) 2045 return -ENOMEM; 2046 2047 /* skip the locally configured cache if a symfs is given, and 2048 * config buildid dir to symfs/.debug 2049 */ 2050 ret = asprintf(&bf, "%s/%s", dir, ".debug"); 2051 if (ret < 0) 2052 return -ENOMEM; 2053 2054 set_buildid_dir(bf); 2055 2056 free(bf); 2057 return 0; 2058 } 2059