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 size_t symbol__fprintf(struct symbol *sym, FILE *fp) 259 { 260 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n", 261 sym->start, sym->end, 262 sym->binding == STB_GLOBAL ? 'g' : 263 sym->binding == STB_LOCAL ? 'l' : 'w', 264 sym->name); 265 } 266 267 size_t symbol__fprintf_symname_offs(const struct symbol *sym, 268 const struct addr_location *al, FILE *fp) 269 { 270 unsigned long offset; 271 size_t length; 272 273 if (sym && sym->name) { 274 length = fprintf(fp, "%s", sym->name); 275 if (al) { 276 if (al->addr < sym->end) 277 offset = al->addr - sym->start; 278 else 279 offset = al->addr - al->map->start - sym->start; 280 length += fprintf(fp, "+0x%lx", offset); 281 } 282 return length; 283 } else 284 return fprintf(fp, "[unknown]"); 285 } 286 287 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp) 288 { 289 return symbol__fprintf_symname_offs(sym, NULL, fp); 290 } 291 292 void symbols__delete(struct rb_root *symbols) 293 { 294 struct symbol *pos; 295 struct rb_node *next = rb_first(symbols); 296 297 while (next) { 298 pos = rb_entry(next, struct symbol, rb_node); 299 next = rb_next(&pos->rb_node); 300 rb_erase(&pos->rb_node, symbols); 301 symbol__delete(pos); 302 } 303 } 304 305 void symbols__insert(struct rb_root *symbols, struct symbol *sym) 306 { 307 struct rb_node **p = &symbols->rb_node; 308 struct rb_node *parent = NULL; 309 const u64 ip = sym->start; 310 struct symbol *s; 311 312 while (*p != NULL) { 313 parent = *p; 314 s = rb_entry(parent, struct symbol, rb_node); 315 if (ip < s->start) 316 p = &(*p)->rb_left; 317 else 318 p = &(*p)->rb_right; 319 } 320 rb_link_node(&sym->rb_node, parent, p); 321 rb_insert_color(&sym->rb_node, symbols); 322 } 323 324 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip) 325 { 326 struct rb_node *n; 327 328 if (symbols == NULL) 329 return NULL; 330 331 n = symbols->rb_node; 332 333 while (n) { 334 struct symbol *s = rb_entry(n, struct symbol, rb_node); 335 336 if (ip < s->start) 337 n = n->rb_left; 338 else if (ip >= s->end) 339 n = n->rb_right; 340 else 341 return s; 342 } 343 344 return NULL; 345 } 346 347 static struct symbol *symbols__first(struct rb_root *symbols) 348 { 349 struct rb_node *n = rb_first(symbols); 350 351 if (n) 352 return rb_entry(n, struct symbol, rb_node); 353 354 return NULL; 355 } 356 357 static struct symbol *symbols__next(struct symbol *sym) 358 { 359 struct rb_node *n = rb_next(&sym->rb_node); 360 361 if (n) 362 return rb_entry(n, struct symbol, rb_node); 363 364 return NULL; 365 } 366 367 struct symbol_name_rb_node { 368 struct rb_node rb_node; 369 struct symbol sym; 370 }; 371 372 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym) 373 { 374 struct rb_node **p = &symbols->rb_node; 375 struct rb_node *parent = NULL; 376 struct symbol_name_rb_node *symn, *s; 377 378 symn = container_of(sym, struct symbol_name_rb_node, sym); 379 380 while (*p != NULL) { 381 parent = *p; 382 s = rb_entry(parent, struct symbol_name_rb_node, rb_node); 383 if (strcmp(sym->name, s->sym.name) < 0) 384 p = &(*p)->rb_left; 385 else 386 p = &(*p)->rb_right; 387 } 388 rb_link_node(&symn->rb_node, parent, p); 389 rb_insert_color(&symn->rb_node, symbols); 390 } 391 392 static void symbols__sort_by_name(struct rb_root *symbols, 393 struct rb_root *source) 394 { 395 struct rb_node *nd; 396 397 for (nd = rb_first(source); nd; nd = rb_next(nd)) { 398 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 399 symbols__insert_by_name(symbols, pos); 400 } 401 } 402 403 static struct symbol *symbols__find_by_name(struct rb_root *symbols, 404 const char *name) 405 { 406 struct rb_node *n; 407 struct symbol_name_rb_node *s = NULL; 408 409 if (symbols == NULL) 410 return NULL; 411 412 n = symbols->rb_node; 413 414 while (n) { 415 int cmp; 416 417 s = rb_entry(n, struct symbol_name_rb_node, rb_node); 418 cmp = arch__compare_symbol_names(name, s->sym.name); 419 420 if (cmp < 0) 421 n = n->rb_left; 422 else if (cmp > 0) 423 n = n->rb_right; 424 else 425 break; 426 } 427 428 if (n == NULL) 429 return NULL; 430 431 /* return first symbol that has same name (if any) */ 432 for (n = rb_prev(n); n; n = rb_prev(n)) { 433 struct symbol_name_rb_node *tmp; 434 435 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node); 436 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name)) 437 break; 438 439 s = tmp; 440 } 441 442 return &s->sym; 443 } 444 445 void dso__reset_find_symbol_cache(struct dso *dso) 446 { 447 enum map_type type; 448 449 for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) { 450 dso->last_find_result[type].addr = 0; 451 dso->last_find_result[type].symbol = NULL; 452 } 453 } 454 455 struct symbol *dso__find_symbol(struct dso *dso, 456 enum map_type type, u64 addr) 457 { 458 if (dso->last_find_result[type].addr != addr) { 459 dso->last_find_result[type].addr = addr; 460 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr); 461 } 462 463 return dso->last_find_result[type].symbol; 464 } 465 466 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type) 467 { 468 return symbols__first(&dso->symbols[type]); 469 } 470 471 struct symbol *dso__next_symbol(struct symbol *sym) 472 { 473 return symbols__next(sym); 474 } 475 476 struct symbol *symbol__next_by_name(struct symbol *sym) 477 { 478 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym); 479 struct rb_node *n = rb_next(&s->rb_node); 480 481 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL; 482 } 483 484 /* 485 * Teturns first symbol that matched with @name. 486 */ 487 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type, 488 const char *name) 489 { 490 return symbols__find_by_name(&dso->symbol_names[type], name); 491 } 492 493 void dso__sort_by_name(struct dso *dso, enum map_type type) 494 { 495 dso__set_sorted_by_name(dso, type); 496 return symbols__sort_by_name(&dso->symbol_names[type], 497 &dso->symbols[type]); 498 } 499 500 size_t dso__fprintf_symbols_by_name(struct dso *dso, 501 enum map_type type, FILE *fp) 502 { 503 size_t ret = 0; 504 struct rb_node *nd; 505 struct symbol_name_rb_node *pos; 506 507 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) { 508 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 509 fprintf(fp, "%s\n", pos->sym.name); 510 } 511 512 return ret; 513 } 514 515 int modules__parse(const char *filename, void *arg, 516 int (*process_module)(void *arg, const char *name, 517 u64 start)) 518 { 519 char *line = NULL; 520 size_t n; 521 FILE *file; 522 int err = 0; 523 524 file = fopen(filename, "r"); 525 if (file == NULL) 526 return -1; 527 528 while (1) { 529 char name[PATH_MAX]; 530 u64 start; 531 char *sep; 532 ssize_t line_len; 533 534 line_len = getline(&line, &n, file); 535 if (line_len < 0) { 536 if (feof(file)) 537 break; 538 err = -1; 539 goto out; 540 } 541 542 if (!line) { 543 err = -1; 544 goto out; 545 } 546 547 line[--line_len] = '\0'; /* \n */ 548 549 sep = strrchr(line, 'x'); 550 if (sep == NULL) 551 continue; 552 553 hex2u64(sep + 1, &start); 554 555 sep = strchr(line, ' '); 556 if (sep == NULL) 557 continue; 558 559 *sep = '\0'; 560 561 scnprintf(name, sizeof(name), "[%s]", line); 562 563 err = process_module(arg, name, start); 564 if (err) 565 break; 566 } 567 out: 568 free(line); 569 fclose(file); 570 return err; 571 } 572 573 struct process_kallsyms_args { 574 struct map *map; 575 struct dso *dso; 576 }; 577 578 /* 579 * These are symbols in the kernel image, so make sure that 580 * sym is from a kernel DSO. 581 */ 582 bool symbol__is_idle(struct symbol *sym) 583 { 584 const char * const idle_symbols[] = { 585 "cpu_idle", 586 "cpu_startup_entry", 587 "intel_idle", 588 "default_idle", 589 "native_safe_halt", 590 "enter_idle", 591 "exit_idle", 592 "mwait_idle", 593 "mwait_idle_with_hints", 594 "poll_idle", 595 "ppc64_runlatch_off", 596 "pseries_dedicated_idle_sleep", 597 NULL 598 }; 599 600 int i; 601 602 if (!sym) 603 return false; 604 605 for (i = 0; idle_symbols[i]; i++) { 606 if (!strcmp(idle_symbols[i], sym->name)) 607 return true; 608 } 609 610 return false; 611 } 612 613 static int map__process_kallsym_symbol(void *arg, const char *name, 614 char type, u64 start) 615 { 616 struct symbol *sym; 617 struct process_kallsyms_args *a = arg; 618 struct rb_root *root = &a->dso->symbols[a->map->type]; 619 620 if (!symbol_type__is_a(type, a->map->type)) 621 return 0; 622 623 /* 624 * module symbols are not sorted so we add all 625 * symbols, setting length to 0, and rely on 626 * symbols__fixup_end() to fix it up. 627 */ 628 sym = symbol__new(start, 0, kallsyms2elf_binding(type), name); 629 if (sym == NULL) 630 return -ENOMEM; 631 /* 632 * We will pass the symbols to the filter later, in 633 * map__split_kallsyms, when we have split the maps per module 634 */ 635 symbols__insert(root, sym); 636 637 return 0; 638 } 639 640 /* 641 * Loads the function entries in /proc/kallsyms into kernel_map->dso, 642 * so that we can in the next step set the symbol ->end address and then 643 * call kernel_maps__split_kallsyms. 644 */ 645 static int dso__load_all_kallsyms(struct dso *dso, const char *filename, 646 struct map *map) 647 { 648 struct process_kallsyms_args args = { .map = map, .dso = dso, }; 649 return kallsyms__parse(filename, &args, map__process_kallsym_symbol); 650 } 651 652 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map, 653 symbol_filter_t filter) 654 { 655 struct map_groups *kmaps = map__kmaps(map); 656 struct map *curr_map; 657 struct symbol *pos; 658 int count = 0; 659 struct rb_root old_root = dso->symbols[map->type]; 660 struct rb_root *root = &dso->symbols[map->type]; 661 struct rb_node *next = rb_first(root); 662 663 if (!kmaps) 664 return -1; 665 666 *root = RB_ROOT; 667 668 while (next) { 669 char *module; 670 671 pos = rb_entry(next, struct symbol, rb_node); 672 next = rb_next(&pos->rb_node); 673 674 rb_erase_init(&pos->rb_node, &old_root); 675 676 module = strchr(pos->name, '\t'); 677 if (module) 678 *module = '\0'; 679 680 curr_map = map_groups__find(kmaps, map->type, pos->start); 681 682 if (!curr_map || (filter && filter(curr_map, pos))) { 683 symbol__delete(pos); 684 continue; 685 } 686 687 pos->start -= curr_map->start - curr_map->pgoff; 688 if (pos->end) 689 pos->end -= curr_map->start - curr_map->pgoff; 690 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); 691 ++count; 692 } 693 694 /* Symbols have been adjusted */ 695 dso->adjust_symbols = 1; 696 697 return count; 698 } 699 700 /* 701 * Split the symbols into maps, making sure there are no overlaps, i.e. the 702 * kernel range is broken in several maps, named [kernel].N, as we don't have 703 * the original ELF section names vmlinux have. 704 */ 705 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta, 706 symbol_filter_t filter) 707 { 708 struct map_groups *kmaps = map__kmaps(map); 709 struct machine *machine; 710 struct map *curr_map = map; 711 struct symbol *pos; 712 int count = 0, moved = 0; 713 struct rb_root *root = &dso->symbols[map->type]; 714 struct rb_node *next = rb_first(root); 715 int kernel_range = 0; 716 717 if (!kmaps) 718 return -1; 719 720 machine = kmaps->machine; 721 722 while (next) { 723 char *module; 724 725 pos = rb_entry(next, struct symbol, rb_node); 726 next = rb_next(&pos->rb_node); 727 728 module = strchr(pos->name, '\t'); 729 if (module) { 730 if (!symbol_conf.use_modules) 731 goto discard_symbol; 732 733 *module++ = '\0'; 734 735 if (strcmp(curr_map->dso->short_name, module)) { 736 if (curr_map != map && 737 dso->kernel == DSO_TYPE_GUEST_KERNEL && 738 machine__is_default_guest(machine)) { 739 /* 740 * We assume all symbols of a module are 741 * continuous in * kallsyms, so curr_map 742 * points to a module and all its 743 * symbols are in its kmap. Mark it as 744 * loaded. 745 */ 746 dso__set_loaded(curr_map->dso, 747 curr_map->type); 748 } 749 750 curr_map = map_groups__find_by_name(kmaps, 751 map->type, module); 752 if (curr_map == NULL) { 753 pr_debug("%s/proc/{kallsyms,modules} " 754 "inconsistency while looking " 755 "for \"%s\" module!\n", 756 machine->root_dir, module); 757 curr_map = map; 758 goto discard_symbol; 759 } 760 761 if (curr_map->dso->loaded && 762 !machine__is_default_guest(machine)) 763 goto discard_symbol; 764 } 765 /* 766 * So that we look just like we get from .ko files, 767 * i.e. not prelinked, relative to map->start. 768 */ 769 pos->start = curr_map->map_ip(curr_map, pos->start); 770 pos->end = curr_map->map_ip(curr_map, pos->end); 771 } else if (curr_map != map) { 772 char dso_name[PATH_MAX]; 773 struct dso *ndso; 774 775 if (delta) { 776 /* Kernel was relocated at boot time */ 777 pos->start -= delta; 778 pos->end -= delta; 779 } 780 781 if (count == 0) { 782 curr_map = map; 783 goto filter_symbol; 784 } 785 786 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 787 snprintf(dso_name, sizeof(dso_name), 788 "[guest.kernel].%d", 789 kernel_range++); 790 else 791 snprintf(dso_name, sizeof(dso_name), 792 "[kernel].%d", 793 kernel_range++); 794 795 ndso = dso__new(dso_name); 796 if (ndso == NULL) 797 return -1; 798 799 ndso->kernel = dso->kernel; 800 801 curr_map = map__new2(pos->start, ndso, map->type); 802 if (curr_map == NULL) { 803 dso__put(ndso); 804 return -1; 805 } 806 807 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; 808 map_groups__insert(kmaps, curr_map); 809 ++kernel_range; 810 } else if (delta) { 811 /* Kernel was relocated at boot time */ 812 pos->start -= delta; 813 pos->end -= delta; 814 } 815 filter_symbol: 816 if (filter && filter(curr_map, pos)) { 817 discard_symbol: rb_erase(&pos->rb_node, root); 818 symbol__delete(pos); 819 } else { 820 if (curr_map != map) { 821 rb_erase(&pos->rb_node, root); 822 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); 823 ++moved; 824 } else 825 ++count; 826 } 827 } 828 829 if (curr_map != map && 830 dso->kernel == DSO_TYPE_GUEST_KERNEL && 831 machine__is_default_guest(kmaps->machine)) { 832 dso__set_loaded(curr_map->dso, curr_map->type); 833 } 834 835 return count + moved; 836 } 837 838 bool symbol__restricted_filename(const char *filename, 839 const char *restricted_filename) 840 { 841 bool restricted = false; 842 843 if (symbol_conf.kptr_restrict) { 844 char *r = realpath(filename, NULL); 845 846 if (r != NULL) { 847 restricted = strcmp(r, restricted_filename) == 0; 848 free(r); 849 return restricted; 850 } 851 } 852 853 return restricted; 854 } 855 856 struct module_info { 857 struct rb_node rb_node; 858 char *name; 859 u64 start; 860 }; 861 862 static void add_module(struct module_info *mi, struct rb_root *modules) 863 { 864 struct rb_node **p = &modules->rb_node; 865 struct rb_node *parent = NULL; 866 struct module_info *m; 867 868 while (*p != NULL) { 869 parent = *p; 870 m = rb_entry(parent, struct module_info, rb_node); 871 if (strcmp(mi->name, m->name) < 0) 872 p = &(*p)->rb_left; 873 else 874 p = &(*p)->rb_right; 875 } 876 rb_link_node(&mi->rb_node, parent, p); 877 rb_insert_color(&mi->rb_node, modules); 878 } 879 880 static void delete_modules(struct rb_root *modules) 881 { 882 struct module_info *mi; 883 struct rb_node *next = rb_first(modules); 884 885 while (next) { 886 mi = rb_entry(next, struct module_info, rb_node); 887 next = rb_next(&mi->rb_node); 888 rb_erase(&mi->rb_node, modules); 889 zfree(&mi->name); 890 free(mi); 891 } 892 } 893 894 static struct module_info *find_module(const char *name, 895 struct rb_root *modules) 896 { 897 struct rb_node *n = modules->rb_node; 898 899 while (n) { 900 struct module_info *m; 901 int cmp; 902 903 m = rb_entry(n, struct module_info, rb_node); 904 cmp = strcmp(name, m->name); 905 if (cmp < 0) 906 n = n->rb_left; 907 else if (cmp > 0) 908 n = n->rb_right; 909 else 910 return m; 911 } 912 913 return NULL; 914 } 915 916 static int __read_proc_modules(void *arg, const char *name, u64 start) 917 { 918 struct rb_root *modules = arg; 919 struct module_info *mi; 920 921 mi = zalloc(sizeof(struct module_info)); 922 if (!mi) 923 return -ENOMEM; 924 925 mi->name = strdup(name); 926 mi->start = start; 927 928 if (!mi->name) { 929 free(mi); 930 return -ENOMEM; 931 } 932 933 add_module(mi, modules); 934 935 return 0; 936 } 937 938 static int read_proc_modules(const char *filename, struct rb_root *modules) 939 { 940 if (symbol__restricted_filename(filename, "/proc/modules")) 941 return -1; 942 943 if (modules__parse(filename, modules, __read_proc_modules)) { 944 delete_modules(modules); 945 return -1; 946 } 947 948 return 0; 949 } 950 951 int compare_proc_modules(const char *from, const char *to) 952 { 953 struct rb_root from_modules = RB_ROOT; 954 struct rb_root to_modules = RB_ROOT; 955 struct rb_node *from_node, *to_node; 956 struct module_info *from_m, *to_m; 957 int ret = -1; 958 959 if (read_proc_modules(from, &from_modules)) 960 return -1; 961 962 if (read_proc_modules(to, &to_modules)) 963 goto out_delete_from; 964 965 from_node = rb_first(&from_modules); 966 to_node = rb_first(&to_modules); 967 while (from_node) { 968 if (!to_node) 969 break; 970 971 from_m = rb_entry(from_node, struct module_info, rb_node); 972 to_m = rb_entry(to_node, struct module_info, rb_node); 973 974 if (from_m->start != to_m->start || 975 strcmp(from_m->name, to_m->name)) 976 break; 977 978 from_node = rb_next(from_node); 979 to_node = rb_next(to_node); 980 } 981 982 if (!from_node && !to_node) 983 ret = 0; 984 985 delete_modules(&to_modules); 986 out_delete_from: 987 delete_modules(&from_modules); 988 989 return ret; 990 } 991 992 static int do_validate_kcore_modules(const char *filename, struct map *map, 993 struct map_groups *kmaps) 994 { 995 struct rb_root modules = RB_ROOT; 996 struct map *old_map; 997 int err; 998 999 err = read_proc_modules(filename, &modules); 1000 if (err) 1001 return err; 1002 1003 old_map = map_groups__first(kmaps, map->type); 1004 while (old_map) { 1005 struct map *next = map_groups__next(old_map); 1006 struct module_info *mi; 1007 1008 if (old_map == map || old_map->start == map->start) { 1009 /* The kernel map */ 1010 old_map = next; 1011 continue; 1012 } 1013 1014 /* Module must be in memory at the same address */ 1015 mi = find_module(old_map->dso->short_name, &modules); 1016 if (!mi || mi->start != old_map->start) { 1017 err = -EINVAL; 1018 goto out; 1019 } 1020 1021 old_map = next; 1022 } 1023 out: 1024 delete_modules(&modules); 1025 return err; 1026 } 1027 1028 /* 1029 * If kallsyms is referenced by name then we look for filename in the same 1030 * directory. 1031 */ 1032 static bool filename_from_kallsyms_filename(char *filename, 1033 const char *base_name, 1034 const char *kallsyms_filename) 1035 { 1036 char *name; 1037 1038 strcpy(filename, kallsyms_filename); 1039 name = strrchr(filename, '/'); 1040 if (!name) 1041 return false; 1042 1043 name += 1; 1044 1045 if (!strcmp(name, "kallsyms")) { 1046 strcpy(name, base_name); 1047 return true; 1048 } 1049 1050 return false; 1051 } 1052 1053 static int validate_kcore_modules(const char *kallsyms_filename, 1054 struct map *map) 1055 { 1056 struct map_groups *kmaps = map__kmaps(map); 1057 char modules_filename[PATH_MAX]; 1058 1059 if (!kmaps) 1060 return -EINVAL; 1061 1062 if (!filename_from_kallsyms_filename(modules_filename, "modules", 1063 kallsyms_filename)) 1064 return -EINVAL; 1065 1066 if (do_validate_kcore_modules(modules_filename, map, kmaps)) 1067 return -EINVAL; 1068 1069 return 0; 1070 } 1071 1072 static int validate_kcore_addresses(const char *kallsyms_filename, 1073 struct map *map) 1074 { 1075 struct kmap *kmap = map__kmap(map); 1076 1077 if (!kmap) 1078 return -EINVAL; 1079 1080 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) { 1081 u64 start; 1082 1083 start = kallsyms__get_function_start(kallsyms_filename, 1084 kmap->ref_reloc_sym->name); 1085 if (start != kmap->ref_reloc_sym->addr) 1086 return -EINVAL; 1087 } 1088 1089 return validate_kcore_modules(kallsyms_filename, map); 1090 } 1091 1092 struct kcore_mapfn_data { 1093 struct dso *dso; 1094 enum map_type type; 1095 struct list_head maps; 1096 }; 1097 1098 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) 1099 { 1100 struct kcore_mapfn_data *md = data; 1101 struct map *map; 1102 1103 map = map__new2(start, md->dso, md->type); 1104 if (map == NULL) 1105 return -ENOMEM; 1106 1107 map->end = map->start + len; 1108 map->pgoff = pgoff; 1109 1110 list_add(&map->node, &md->maps); 1111 1112 return 0; 1113 } 1114 1115 static int dso__load_kcore(struct dso *dso, struct map *map, 1116 const char *kallsyms_filename) 1117 { 1118 struct map_groups *kmaps = map__kmaps(map); 1119 struct machine *machine; 1120 struct kcore_mapfn_data md; 1121 struct map *old_map, *new_map, *replacement_map = NULL; 1122 bool is_64_bit; 1123 int err, fd; 1124 char kcore_filename[PATH_MAX]; 1125 struct symbol *sym; 1126 1127 if (!kmaps) 1128 return -EINVAL; 1129 1130 machine = kmaps->machine; 1131 1132 /* This function requires that the map is the kernel map */ 1133 if (map != machine->vmlinux_maps[map->type]) 1134 return -EINVAL; 1135 1136 if (!filename_from_kallsyms_filename(kcore_filename, "kcore", 1137 kallsyms_filename)) 1138 return -EINVAL; 1139 1140 /* Modules and kernel must be present at their original addresses */ 1141 if (validate_kcore_addresses(kallsyms_filename, map)) 1142 return -EINVAL; 1143 1144 md.dso = dso; 1145 md.type = map->type; 1146 INIT_LIST_HEAD(&md.maps); 1147 1148 fd = open(kcore_filename, O_RDONLY); 1149 if (fd < 0) { 1150 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n", 1151 kcore_filename); 1152 return -EINVAL; 1153 } 1154 1155 /* Read new maps into temporary lists */ 1156 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md, 1157 &is_64_bit); 1158 if (err) 1159 goto out_err; 1160 dso->is_64_bit = is_64_bit; 1161 1162 if (list_empty(&md.maps)) { 1163 err = -EINVAL; 1164 goto out_err; 1165 } 1166 1167 /* Remove old maps */ 1168 old_map = map_groups__first(kmaps, map->type); 1169 while (old_map) { 1170 struct map *next = map_groups__next(old_map); 1171 1172 if (old_map != map) 1173 map_groups__remove(kmaps, old_map); 1174 old_map = next; 1175 } 1176 1177 /* Find the kernel map using the first symbol */ 1178 sym = dso__first_symbol(dso, map->type); 1179 list_for_each_entry(new_map, &md.maps, node) { 1180 if (sym && sym->start >= new_map->start && 1181 sym->start < new_map->end) { 1182 replacement_map = new_map; 1183 break; 1184 } 1185 } 1186 1187 if (!replacement_map) 1188 replacement_map = list_entry(md.maps.next, struct map, node); 1189 1190 /* Add new maps */ 1191 while (!list_empty(&md.maps)) { 1192 new_map = list_entry(md.maps.next, struct map, node); 1193 list_del_init(&new_map->node); 1194 if (new_map == replacement_map) { 1195 map->start = new_map->start; 1196 map->end = new_map->end; 1197 map->pgoff = new_map->pgoff; 1198 map->map_ip = new_map->map_ip; 1199 map->unmap_ip = new_map->unmap_ip; 1200 /* Ensure maps are correctly ordered */ 1201 map__get(map); 1202 map_groups__remove(kmaps, map); 1203 map_groups__insert(kmaps, map); 1204 map__put(map); 1205 } else { 1206 map_groups__insert(kmaps, new_map); 1207 } 1208 1209 map__put(new_map); 1210 } 1211 1212 /* 1213 * Set the data type and long name so that kcore can be read via 1214 * dso__data_read_addr(). 1215 */ 1216 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1217 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE; 1218 else 1219 dso->binary_type = DSO_BINARY_TYPE__KCORE; 1220 dso__set_long_name(dso, strdup(kcore_filename), true); 1221 1222 close(fd); 1223 1224 if (map->type == MAP__FUNCTION) 1225 pr_debug("Using %s for kernel object code\n", kcore_filename); 1226 else 1227 pr_debug("Using %s for kernel data\n", kcore_filename); 1228 1229 return 0; 1230 1231 out_err: 1232 while (!list_empty(&md.maps)) { 1233 map = list_entry(md.maps.next, struct map, node); 1234 list_del_init(&map->node); 1235 map__put(map); 1236 } 1237 close(fd); 1238 return -EINVAL; 1239 } 1240 1241 /* 1242 * If the kernel is relocated at boot time, kallsyms won't match. Compute the 1243 * delta based on the relocation reference symbol. 1244 */ 1245 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta) 1246 { 1247 struct kmap *kmap = map__kmap(map); 1248 u64 addr; 1249 1250 if (!kmap) 1251 return -1; 1252 1253 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) 1254 return 0; 1255 1256 addr = kallsyms__get_function_start(filename, 1257 kmap->ref_reloc_sym->name); 1258 if (!addr) 1259 return -1; 1260 1261 *delta = addr - kmap->ref_reloc_sym->addr; 1262 return 0; 1263 } 1264 1265 int dso__load_kallsyms(struct dso *dso, const char *filename, 1266 struct map *map, symbol_filter_t filter) 1267 { 1268 u64 delta = 0; 1269 1270 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 1271 return -1; 1272 1273 if (dso__load_all_kallsyms(dso, filename, map) < 0) 1274 return -1; 1275 1276 if (kallsyms__delta(map, filename, &delta)) 1277 return -1; 1278 1279 symbols__fixup_duplicate(&dso->symbols[map->type]); 1280 symbols__fixup_end(&dso->symbols[map->type]); 1281 1282 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1283 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1284 else 1285 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; 1286 1287 if (!dso__load_kcore(dso, map, filename)) 1288 return dso__split_kallsyms_for_kcore(dso, map, filter); 1289 else 1290 return dso__split_kallsyms(dso, map, delta, filter); 1291 } 1292 1293 static int dso__load_perf_map(struct dso *dso, struct map *map, 1294 symbol_filter_t filter) 1295 { 1296 char *line = NULL; 1297 size_t n; 1298 FILE *file; 1299 int nr_syms = 0; 1300 1301 file = fopen(dso->long_name, "r"); 1302 if (file == NULL) 1303 goto out_failure; 1304 1305 while (!feof(file)) { 1306 u64 start, size; 1307 struct symbol *sym; 1308 int line_len, len; 1309 1310 line_len = getline(&line, &n, file); 1311 if (line_len < 0) 1312 break; 1313 1314 if (!line) 1315 goto out_failure; 1316 1317 line[--line_len] = '\0'; /* \n */ 1318 1319 len = hex2u64(line, &start); 1320 1321 len++; 1322 if (len + 2 >= line_len) 1323 continue; 1324 1325 len += hex2u64(line + len, &size); 1326 1327 len++; 1328 if (len + 2 >= line_len) 1329 continue; 1330 1331 sym = symbol__new(start, size, STB_GLOBAL, line + len); 1332 1333 if (sym == NULL) 1334 goto out_delete_line; 1335 1336 if (filter && filter(map, sym)) 1337 symbol__delete(sym); 1338 else { 1339 symbols__insert(&dso->symbols[map->type], sym); 1340 nr_syms++; 1341 } 1342 } 1343 1344 free(line); 1345 fclose(file); 1346 1347 return nr_syms; 1348 1349 out_delete_line: 1350 free(line); 1351 out_failure: 1352 return -1; 1353 } 1354 1355 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, 1356 enum dso_binary_type type) 1357 { 1358 switch (type) { 1359 case DSO_BINARY_TYPE__JAVA_JIT: 1360 case DSO_BINARY_TYPE__DEBUGLINK: 1361 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO: 1362 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO: 1363 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO: 1364 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO: 1365 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: 1366 return !kmod && dso->kernel == DSO_TYPE_USER; 1367 1368 case DSO_BINARY_TYPE__KALLSYMS: 1369 case DSO_BINARY_TYPE__VMLINUX: 1370 case DSO_BINARY_TYPE__KCORE: 1371 return dso->kernel == DSO_TYPE_KERNEL; 1372 1373 case DSO_BINARY_TYPE__GUEST_KALLSYMS: 1374 case DSO_BINARY_TYPE__GUEST_VMLINUX: 1375 case DSO_BINARY_TYPE__GUEST_KCORE: 1376 return dso->kernel == DSO_TYPE_GUEST_KERNEL; 1377 1378 case DSO_BINARY_TYPE__GUEST_KMODULE: 1379 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP: 1380 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE: 1381 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP: 1382 /* 1383 * kernel modules know their symtab type - it's set when 1384 * creating a module dso in machine__findnew_module_map(). 1385 */ 1386 return kmod && dso->symtab_type == type; 1387 1388 case DSO_BINARY_TYPE__BUILD_ID_CACHE: 1389 return true; 1390 1391 case DSO_BINARY_TYPE__NOT_FOUND: 1392 default: 1393 return false; 1394 } 1395 } 1396 1397 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) 1398 { 1399 char *name; 1400 int ret = -1; 1401 u_int i; 1402 struct machine *machine; 1403 char *root_dir = (char *) ""; 1404 int ss_pos = 0; 1405 struct symsrc ss_[2]; 1406 struct symsrc *syms_ss = NULL, *runtime_ss = NULL; 1407 bool kmod; 1408 unsigned char build_id[BUILD_ID_SIZE]; 1409 1410 pthread_mutex_lock(&dso->lock); 1411 1412 /* check again under the dso->lock */ 1413 if (dso__loaded(dso, map->type)) { 1414 ret = 1; 1415 goto out; 1416 } 1417 1418 if (dso->kernel) { 1419 if (dso->kernel == DSO_TYPE_KERNEL) 1420 ret = dso__load_kernel_sym(dso, map, filter); 1421 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1422 ret = dso__load_guest_kernel_sym(dso, map, filter); 1423 1424 goto out; 1425 } 1426 1427 if (map->groups && map->groups->machine) 1428 machine = map->groups->machine; 1429 else 1430 machine = NULL; 1431 1432 dso->adjust_symbols = 0; 1433 1434 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) { 1435 struct stat st; 1436 1437 if (lstat(dso->name, &st) < 0) 1438 goto out; 1439 1440 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) { 1441 pr_warning("File %s not owned by current user or root, " 1442 "ignoring it (use -f to override).\n", dso->name); 1443 goto out; 1444 } 1445 1446 ret = dso__load_perf_map(dso, map, filter); 1447 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : 1448 DSO_BINARY_TYPE__NOT_FOUND; 1449 goto out; 1450 } 1451 1452 if (machine) 1453 root_dir = machine->root_dir; 1454 1455 name = malloc(PATH_MAX); 1456 if (!name) 1457 goto out; 1458 1459 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || 1460 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP || 1461 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || 1462 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; 1463 1464 1465 /* 1466 * Read the build id if possible. This is required for 1467 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work 1468 */ 1469 if (is_regular_file(name) && 1470 filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0) 1471 dso__set_build_id(dso, build_id); 1472 1473 /* 1474 * Iterate over candidate debug images. 1475 * Keep track of "interesting" ones (those which have a symtab, dynsym, 1476 * and/or opd section) for processing. 1477 */ 1478 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { 1479 struct symsrc *ss = &ss_[ss_pos]; 1480 bool next_slot = false; 1481 1482 enum dso_binary_type symtab_type = binary_type_symtab[i]; 1483 1484 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type)) 1485 continue; 1486 1487 if (dso__read_binary_type_filename(dso, symtab_type, 1488 root_dir, name, PATH_MAX)) 1489 continue; 1490 1491 if (!is_regular_file(name)) 1492 continue; 1493 1494 /* Name is now the name of the next image to try */ 1495 if (symsrc__init(ss, dso, name, symtab_type) < 0) 1496 continue; 1497 1498 if (!syms_ss && symsrc__has_symtab(ss)) { 1499 syms_ss = ss; 1500 next_slot = true; 1501 if (!dso->symsrc_filename) 1502 dso->symsrc_filename = strdup(name); 1503 } 1504 1505 if (!runtime_ss && symsrc__possibly_runtime(ss)) { 1506 runtime_ss = ss; 1507 next_slot = true; 1508 } 1509 1510 if (next_slot) { 1511 ss_pos++; 1512 1513 if (syms_ss && runtime_ss) 1514 break; 1515 } else { 1516 symsrc__destroy(ss); 1517 } 1518 1519 } 1520 1521 if (!runtime_ss && !syms_ss) 1522 goto out_free; 1523 1524 if (runtime_ss && !syms_ss) { 1525 syms_ss = runtime_ss; 1526 } 1527 1528 /* We'll have to hope for the best */ 1529 if (!runtime_ss && syms_ss) 1530 runtime_ss = syms_ss; 1531 1532 if (syms_ss && syms_ss->type == DSO_BINARY_TYPE__BUILD_ID_CACHE) 1533 if (dso__build_id_is_kmod(dso, name, PATH_MAX)) 1534 kmod = true; 1535 1536 if (syms_ss) 1537 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod); 1538 else 1539 ret = -1; 1540 1541 if (ret > 0) { 1542 int nr_plt; 1543 1544 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter); 1545 if (nr_plt > 0) 1546 ret += nr_plt; 1547 } 1548 1549 for (; ss_pos > 0; ss_pos--) 1550 symsrc__destroy(&ss_[ss_pos - 1]); 1551 out_free: 1552 free(name); 1553 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) 1554 ret = 0; 1555 out: 1556 dso__set_loaded(dso, map->type); 1557 pthread_mutex_unlock(&dso->lock); 1558 1559 return ret; 1560 } 1561 1562 struct map *map_groups__find_by_name(struct map_groups *mg, 1563 enum map_type type, const char *name) 1564 { 1565 struct maps *maps = &mg->maps[type]; 1566 struct map *map; 1567 1568 pthread_rwlock_rdlock(&maps->lock); 1569 1570 for (map = maps__first(maps); map; map = map__next(map)) { 1571 if (map->dso && strcmp(map->dso->short_name, name) == 0) 1572 goto out_unlock; 1573 } 1574 1575 map = NULL; 1576 1577 out_unlock: 1578 pthread_rwlock_unlock(&maps->lock); 1579 return map; 1580 } 1581 1582 int dso__load_vmlinux(struct dso *dso, struct map *map, 1583 const char *vmlinux, bool vmlinux_allocated, 1584 symbol_filter_t filter) 1585 { 1586 int err = -1; 1587 struct symsrc ss; 1588 char symfs_vmlinux[PATH_MAX]; 1589 enum dso_binary_type symtab_type; 1590 1591 if (vmlinux[0] == '/') 1592 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux); 1593 else 1594 symbol__join_symfs(symfs_vmlinux, vmlinux); 1595 1596 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1597 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1598 else 1599 symtab_type = DSO_BINARY_TYPE__VMLINUX; 1600 1601 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) 1602 return -1; 1603 1604 err = dso__load_sym(dso, map, &ss, &ss, filter, 0); 1605 symsrc__destroy(&ss); 1606 1607 if (err > 0) { 1608 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1609 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1610 else 1611 dso->binary_type = DSO_BINARY_TYPE__VMLINUX; 1612 dso__set_long_name(dso, vmlinux, vmlinux_allocated); 1613 dso__set_loaded(dso, map->type); 1614 pr_debug("Using %s for symbols\n", symfs_vmlinux); 1615 } 1616 1617 return err; 1618 } 1619 1620 int dso__load_vmlinux_path(struct dso *dso, struct map *map, 1621 symbol_filter_t filter) 1622 { 1623 int i, err = 0; 1624 char *filename = NULL; 1625 1626 pr_debug("Looking at the vmlinux_path (%d entries long)\n", 1627 vmlinux_path__nr_entries + 1); 1628 1629 for (i = 0; i < vmlinux_path__nr_entries; ++i) { 1630 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter); 1631 if (err > 0) 1632 goto out; 1633 } 1634 1635 if (!symbol_conf.ignore_vmlinux_buildid) 1636 filename = dso__build_id_filename(dso, NULL, 0); 1637 if (filename != NULL) { 1638 err = dso__load_vmlinux(dso, map, filename, true, filter); 1639 if (err > 0) 1640 goto out; 1641 free(filename); 1642 } 1643 out: 1644 return err; 1645 } 1646 1647 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) 1648 { 1649 char kallsyms_filename[PATH_MAX]; 1650 struct dirent *dent; 1651 int ret = -1; 1652 DIR *d; 1653 1654 d = opendir(dir); 1655 if (!d) 1656 return -1; 1657 1658 while (1) { 1659 dent = readdir(d); 1660 if (!dent) 1661 break; 1662 if (dent->d_type != DT_DIR) 1663 continue; 1664 scnprintf(kallsyms_filename, sizeof(kallsyms_filename), 1665 "%s/%s/kallsyms", dir, dent->d_name); 1666 if (!validate_kcore_addresses(kallsyms_filename, map)) { 1667 strlcpy(dir, kallsyms_filename, dir_sz); 1668 ret = 0; 1669 break; 1670 } 1671 } 1672 1673 closedir(d); 1674 1675 return ret; 1676 } 1677 1678 static char *dso__find_kallsyms(struct dso *dso, struct map *map) 1679 { 1680 u8 host_build_id[BUILD_ID_SIZE]; 1681 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 1682 bool is_host = false; 1683 char path[PATH_MAX]; 1684 1685 if (!dso->has_build_id) { 1686 /* 1687 * Last resort, if we don't have a build-id and couldn't find 1688 * any vmlinux file, try the running kernel kallsyms table. 1689 */ 1690 goto proc_kallsyms; 1691 } 1692 1693 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id, 1694 sizeof(host_build_id)) == 0) 1695 is_host = dso__build_id_equal(dso, host_build_id); 1696 1697 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); 1698 1699 scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir, 1700 sbuild_id); 1701 1702 /* Use /proc/kallsyms if possible */ 1703 if (is_host) { 1704 DIR *d; 1705 int fd; 1706 1707 /* If no cached kcore go with /proc/kallsyms */ 1708 d = opendir(path); 1709 if (!d) 1710 goto proc_kallsyms; 1711 closedir(d); 1712 1713 /* 1714 * Do not check the build-id cache, until we know we cannot use 1715 * /proc/kcore. 1716 */ 1717 fd = open("/proc/kcore", O_RDONLY); 1718 if (fd != -1) { 1719 close(fd); 1720 /* If module maps match go with /proc/kallsyms */ 1721 if (!validate_kcore_addresses("/proc/kallsyms", map)) 1722 goto proc_kallsyms; 1723 } 1724 1725 /* Find kallsyms in build-id cache with kcore */ 1726 if (!find_matching_kcore(map, path, sizeof(path))) 1727 return strdup(path); 1728 1729 goto proc_kallsyms; 1730 } 1731 1732 /* Find kallsyms in build-id cache with kcore */ 1733 if (!find_matching_kcore(map, path, sizeof(path))) 1734 return strdup(path); 1735 1736 scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s", 1737 buildid_dir, sbuild_id); 1738 1739 if (access(path, F_OK)) { 1740 pr_err("No kallsyms or vmlinux with build-id %s was found\n", 1741 sbuild_id); 1742 return NULL; 1743 } 1744 1745 return strdup(path); 1746 1747 proc_kallsyms: 1748 return strdup("/proc/kallsyms"); 1749 } 1750 1751 static int dso__load_kernel_sym(struct dso *dso, struct map *map, 1752 symbol_filter_t filter) 1753 { 1754 int err; 1755 const char *kallsyms_filename = NULL; 1756 char *kallsyms_allocated_filename = NULL; 1757 /* 1758 * Step 1: if the user specified a kallsyms or vmlinux filename, use 1759 * it and only it, reporting errors to the user if it cannot be used. 1760 * 1761 * For instance, try to analyse an ARM perf.data file _without_ a 1762 * build-id, or if the user specifies the wrong path to the right 1763 * vmlinux file, obviously we can't fallback to another vmlinux (a 1764 * x86_86 one, on the machine where analysis is being performed, say), 1765 * or worse, /proc/kallsyms. 1766 * 1767 * If the specified file _has_ a build-id and there is a build-id 1768 * section in the perf.data file, we will still do the expected 1769 * validation in dso__load_vmlinux and will bail out if they don't 1770 * match. 1771 */ 1772 if (symbol_conf.kallsyms_name != NULL) { 1773 kallsyms_filename = symbol_conf.kallsyms_name; 1774 goto do_kallsyms; 1775 } 1776 1777 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) { 1778 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, 1779 false, filter); 1780 } 1781 1782 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { 1783 err = dso__load_vmlinux_path(dso, map, filter); 1784 if (err > 0) 1785 return err; 1786 } 1787 1788 /* do not try local files if a symfs was given */ 1789 if (symbol_conf.symfs[0] != 0) 1790 return -1; 1791 1792 kallsyms_allocated_filename = dso__find_kallsyms(dso, map); 1793 if (!kallsyms_allocated_filename) 1794 return -1; 1795 1796 kallsyms_filename = kallsyms_allocated_filename; 1797 1798 do_kallsyms: 1799 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1800 if (err > 0) 1801 pr_debug("Using %s for symbols\n", kallsyms_filename); 1802 free(kallsyms_allocated_filename); 1803 1804 if (err > 0 && !dso__is_kcore(dso)) { 1805 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS; 1806 dso__set_long_name(dso, "[kernel.kallsyms]", false); 1807 map__fixup_start(map); 1808 map__fixup_end(map); 1809 } 1810 1811 return err; 1812 } 1813 1814 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, 1815 symbol_filter_t filter) 1816 { 1817 int err; 1818 const char *kallsyms_filename = NULL; 1819 struct machine *machine; 1820 char path[PATH_MAX]; 1821 1822 if (!map->groups) { 1823 pr_debug("Guest kernel map hasn't the point to groups\n"); 1824 return -1; 1825 } 1826 machine = map->groups->machine; 1827 1828 if (machine__is_default_guest(machine)) { 1829 /* 1830 * if the user specified a vmlinux filename, use it and only 1831 * it, reporting errors to the user if it cannot be used. 1832 * Or use file guest_kallsyms inputted by user on commandline 1833 */ 1834 if (symbol_conf.default_guest_vmlinux_name != NULL) { 1835 err = dso__load_vmlinux(dso, map, 1836 symbol_conf.default_guest_vmlinux_name, 1837 false, filter); 1838 return err; 1839 } 1840 1841 kallsyms_filename = symbol_conf.default_guest_kallsyms; 1842 if (!kallsyms_filename) 1843 return -1; 1844 } else { 1845 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 1846 kallsyms_filename = path; 1847 } 1848 1849 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1850 if (err > 0) 1851 pr_debug("Using %s for symbols\n", kallsyms_filename); 1852 if (err > 0 && !dso__is_kcore(dso)) { 1853 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1854 machine__mmap_name(machine, path, sizeof(path)); 1855 dso__set_long_name(dso, strdup(path), true); 1856 map__fixup_start(map); 1857 map__fixup_end(map); 1858 } 1859 1860 return err; 1861 } 1862 1863 static void vmlinux_path__exit(void) 1864 { 1865 while (--vmlinux_path__nr_entries >= 0) 1866 zfree(&vmlinux_path[vmlinux_path__nr_entries]); 1867 vmlinux_path__nr_entries = 0; 1868 1869 zfree(&vmlinux_path); 1870 } 1871 1872 static const char * const vmlinux_paths[] = { 1873 "vmlinux", 1874 "/boot/vmlinux" 1875 }; 1876 1877 static const char * const vmlinux_paths_upd[] = { 1878 "/boot/vmlinux-%s", 1879 "/usr/lib/debug/boot/vmlinux-%s", 1880 "/lib/modules/%s/build/vmlinux", 1881 "/usr/lib/debug/lib/modules/%s/vmlinux", 1882 "/usr/lib/debug/boot/vmlinux-%s.debug" 1883 }; 1884 1885 static int vmlinux_path__add(const char *new_entry) 1886 { 1887 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry); 1888 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1889 return -1; 1890 ++vmlinux_path__nr_entries; 1891 1892 return 0; 1893 } 1894 1895 static int vmlinux_path__init(struct perf_env *env) 1896 { 1897 struct utsname uts; 1898 char bf[PATH_MAX]; 1899 char *kernel_version; 1900 unsigned int i; 1901 1902 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) + 1903 ARRAY_SIZE(vmlinux_paths_upd))); 1904 if (vmlinux_path == NULL) 1905 return -1; 1906 1907 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++) 1908 if (vmlinux_path__add(vmlinux_paths[i]) < 0) 1909 goto out_fail; 1910 1911 /* only try kernel version if no symfs was given */ 1912 if (symbol_conf.symfs[0] != 0) 1913 return 0; 1914 1915 if (env) { 1916 kernel_version = env->os_release; 1917 } else { 1918 if (uname(&uts) < 0) 1919 goto out_fail; 1920 1921 kernel_version = uts.release; 1922 } 1923 1924 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) { 1925 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version); 1926 if (vmlinux_path__add(bf) < 0) 1927 goto out_fail; 1928 } 1929 1930 return 0; 1931 1932 out_fail: 1933 vmlinux_path__exit(); 1934 return -1; 1935 } 1936 1937 int setup_list(struct strlist **list, const char *list_str, 1938 const char *list_name) 1939 { 1940 if (list_str == NULL) 1941 return 0; 1942 1943 *list = strlist__new(list_str, NULL); 1944 if (!*list) { 1945 pr_err("problems parsing %s list\n", list_name); 1946 return -1; 1947 } 1948 1949 symbol_conf.has_filter = true; 1950 return 0; 1951 } 1952 1953 int setup_intlist(struct intlist **list, const char *list_str, 1954 const char *list_name) 1955 { 1956 if (list_str == NULL) 1957 return 0; 1958 1959 *list = intlist__new(list_str); 1960 if (!*list) { 1961 pr_err("problems parsing %s list\n", list_name); 1962 return -1; 1963 } 1964 return 0; 1965 } 1966 1967 static bool symbol__read_kptr_restrict(void) 1968 { 1969 bool value = false; 1970 1971 if (geteuid() != 0) { 1972 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); 1973 if (fp != NULL) { 1974 char line[8]; 1975 1976 if (fgets(line, sizeof(line), fp) != NULL) 1977 value = atoi(line) != 0; 1978 1979 fclose(fp); 1980 } 1981 } 1982 1983 return value; 1984 } 1985 1986 int symbol__init(struct perf_env *env) 1987 { 1988 const char *symfs; 1989 1990 if (symbol_conf.initialized) 1991 return 0; 1992 1993 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); 1994 1995 symbol__elf_init(); 1996 1997 if (symbol_conf.sort_by_name) 1998 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - 1999 sizeof(struct symbol)); 2000 2001 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0) 2002 return -1; 2003 2004 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { 2005 pr_err("'.' is the only non valid --field-separator argument\n"); 2006 return -1; 2007 } 2008 2009 if (setup_list(&symbol_conf.dso_list, 2010 symbol_conf.dso_list_str, "dso") < 0) 2011 return -1; 2012 2013 if (setup_list(&symbol_conf.comm_list, 2014 symbol_conf.comm_list_str, "comm") < 0) 2015 goto out_free_dso_list; 2016 2017 if (setup_intlist(&symbol_conf.pid_list, 2018 symbol_conf.pid_list_str, "pid") < 0) 2019 goto out_free_comm_list; 2020 2021 if (setup_intlist(&symbol_conf.tid_list, 2022 symbol_conf.tid_list_str, "tid") < 0) 2023 goto out_free_pid_list; 2024 2025 if (setup_list(&symbol_conf.sym_list, 2026 symbol_conf.sym_list_str, "symbol") < 0) 2027 goto out_free_tid_list; 2028 2029 /* 2030 * A path to symbols of "/" is identical to "" 2031 * reset here for simplicity. 2032 */ 2033 symfs = realpath(symbol_conf.symfs, NULL); 2034 if (symfs == NULL) 2035 symfs = symbol_conf.symfs; 2036 if (strcmp(symfs, "/") == 0) 2037 symbol_conf.symfs = ""; 2038 if (symfs != symbol_conf.symfs) 2039 free((void *)symfs); 2040 2041 symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); 2042 2043 symbol_conf.initialized = true; 2044 return 0; 2045 2046 out_free_tid_list: 2047 intlist__delete(symbol_conf.tid_list); 2048 out_free_pid_list: 2049 intlist__delete(symbol_conf.pid_list); 2050 out_free_comm_list: 2051 strlist__delete(symbol_conf.comm_list); 2052 out_free_dso_list: 2053 strlist__delete(symbol_conf.dso_list); 2054 return -1; 2055 } 2056 2057 void symbol__exit(void) 2058 { 2059 if (!symbol_conf.initialized) 2060 return; 2061 strlist__delete(symbol_conf.sym_list); 2062 strlist__delete(symbol_conf.dso_list); 2063 strlist__delete(symbol_conf.comm_list); 2064 intlist__delete(symbol_conf.tid_list); 2065 intlist__delete(symbol_conf.pid_list); 2066 vmlinux_path__exit(); 2067 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; 2068 symbol_conf.initialized = false; 2069 } 2070