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 }; 43 44 static enum dso_binary_type binary_type_symtab[] = { 45 DSO_BINARY_TYPE__KALLSYMS, 46 DSO_BINARY_TYPE__GUEST_KALLSYMS, 47 DSO_BINARY_TYPE__JAVA_JIT, 48 DSO_BINARY_TYPE__DEBUGLINK, 49 DSO_BINARY_TYPE__BUILD_ID_CACHE, 50 DSO_BINARY_TYPE__FEDORA_DEBUGINFO, 51 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, 52 DSO_BINARY_TYPE__BUILDID_DEBUGINFO, 53 DSO_BINARY_TYPE__SYSTEM_PATH_DSO, 54 DSO_BINARY_TYPE__GUEST_KMODULE, 55 DSO_BINARY_TYPE__GUEST_KMODULE_COMP, 56 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, 57 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP, 58 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, 59 DSO_BINARY_TYPE__NOT_FOUND, 60 }; 61 62 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) 63 64 bool symbol_type__is_a(char symbol_type, enum map_type map_type) 65 { 66 symbol_type = toupper(symbol_type); 67 68 switch (map_type) { 69 case MAP__FUNCTION: 70 return symbol_type == 'T' || symbol_type == 'W'; 71 case MAP__VARIABLE: 72 return symbol_type == 'D'; 73 default: 74 return false; 75 } 76 } 77 78 static int prefix_underscores_count(const char *str) 79 { 80 const char *tail = str; 81 82 while (*tail == '_') 83 tail++; 84 85 return tail - str; 86 } 87 88 int __weak arch__choose_best_symbol(struct symbol *syma, 89 struct symbol *symb __maybe_unused) 90 { 91 /* Avoid "SyS" kernel syscall aliases */ 92 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3)) 93 return SYMBOL_B; 94 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10)) 95 return SYMBOL_B; 96 97 return SYMBOL_A; 98 } 99 100 static int choose_best_symbol(struct symbol *syma, struct symbol *symb) 101 { 102 s64 a; 103 s64 b; 104 size_t na, nb; 105 106 /* Prefer a symbol with non zero length */ 107 a = syma->end - syma->start; 108 b = symb->end - symb->start; 109 if ((b == 0) && (a > 0)) 110 return SYMBOL_A; 111 else if ((a == 0) && (b > 0)) 112 return SYMBOL_B; 113 114 /* Prefer a non weak symbol over a weak one */ 115 a = syma->binding == STB_WEAK; 116 b = symb->binding == STB_WEAK; 117 if (b && !a) 118 return SYMBOL_A; 119 if (a && !b) 120 return SYMBOL_B; 121 122 /* Prefer a global symbol over a non global one */ 123 a = syma->binding == STB_GLOBAL; 124 b = symb->binding == STB_GLOBAL; 125 if (a && !b) 126 return SYMBOL_A; 127 if (b && !a) 128 return SYMBOL_B; 129 130 /* Prefer a symbol with less underscores */ 131 a = prefix_underscores_count(syma->name); 132 b = prefix_underscores_count(symb->name); 133 if (b > a) 134 return SYMBOL_A; 135 else if (a > b) 136 return SYMBOL_B; 137 138 /* Choose the symbol with the longest name */ 139 na = strlen(syma->name); 140 nb = strlen(symb->name); 141 if (na > nb) 142 return SYMBOL_A; 143 else if (na < nb) 144 return SYMBOL_B; 145 146 return arch__choose_best_symbol(syma, symb); 147 } 148 149 void symbols__fixup_duplicate(struct rb_root *symbols) 150 { 151 struct rb_node *nd; 152 struct symbol *curr, *next; 153 154 nd = rb_first(symbols); 155 156 while (nd) { 157 curr = rb_entry(nd, struct symbol, rb_node); 158 again: 159 nd = rb_next(&curr->rb_node); 160 next = rb_entry(nd, struct symbol, rb_node); 161 162 if (!nd) 163 break; 164 165 if (curr->start != next->start) 166 continue; 167 168 if (choose_best_symbol(curr, next) == SYMBOL_A) { 169 rb_erase(&next->rb_node, symbols); 170 symbol__delete(next); 171 goto again; 172 } else { 173 nd = rb_next(&curr->rb_node); 174 rb_erase(&curr->rb_node, symbols); 175 symbol__delete(curr); 176 } 177 } 178 } 179 180 void symbols__fixup_end(struct rb_root *symbols) 181 { 182 struct rb_node *nd, *prevnd = rb_first(symbols); 183 struct symbol *curr, *prev; 184 185 if (prevnd == NULL) 186 return; 187 188 curr = rb_entry(prevnd, struct symbol, rb_node); 189 190 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 191 prev = curr; 192 curr = rb_entry(nd, struct symbol, rb_node); 193 194 if (prev->end == prev->start && prev->end != curr->start) 195 prev->end = curr->start; 196 } 197 198 /* Last entry */ 199 if (curr->end == curr->start) 200 curr->end = roundup(curr->start, 4096); 201 } 202 203 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) 204 { 205 struct maps *maps = &mg->maps[type]; 206 struct map *next, *curr; 207 208 pthread_rwlock_wrlock(&maps->lock); 209 210 curr = maps__first(maps); 211 if (curr == NULL) 212 goto out_unlock; 213 214 for (next = map__next(curr); next; next = map__next(curr)) { 215 curr->end = next->start; 216 curr = next; 217 } 218 219 /* 220 * We still haven't the actual symbols, so guess the 221 * last map final address. 222 */ 223 curr->end = ~0ULL; 224 225 out_unlock: 226 pthread_rwlock_unlock(&maps->lock); 227 } 228 229 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name) 230 { 231 size_t namelen = strlen(name) + 1; 232 struct symbol *sym = calloc(1, (symbol_conf.priv_size + 233 sizeof(*sym) + namelen)); 234 if (sym == NULL) 235 return NULL; 236 237 if (symbol_conf.priv_size) 238 sym = ((void *)sym) + symbol_conf.priv_size; 239 240 sym->start = start; 241 sym->end = len ? start + len : start; 242 sym->binding = binding; 243 sym->namelen = namelen - 1; 244 245 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", 246 __func__, name, start, sym->end); 247 memcpy(sym->name, name, namelen); 248 249 return sym; 250 } 251 252 void symbol__delete(struct symbol *sym) 253 { 254 free(((void *)sym) - symbol_conf.priv_size); 255 } 256 257 size_t symbol__fprintf(struct symbol *sym, FILE *fp) 258 { 259 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n", 260 sym->start, sym->end, 261 sym->binding == STB_GLOBAL ? 'g' : 262 sym->binding == STB_LOCAL ? 'l' : 'w', 263 sym->name); 264 } 265 266 size_t symbol__fprintf_symname_offs(const struct symbol *sym, 267 const struct addr_location *al, FILE *fp) 268 { 269 unsigned long offset; 270 size_t length; 271 272 if (sym && sym->name) { 273 length = fprintf(fp, "%s", sym->name); 274 if (al) { 275 if (al->addr < sym->end) 276 offset = al->addr - sym->start; 277 else 278 offset = al->addr - al->map->start - sym->start; 279 length += fprintf(fp, "+0x%lx", offset); 280 } 281 return length; 282 } else 283 return fprintf(fp, "[unknown]"); 284 } 285 286 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp) 287 { 288 return symbol__fprintf_symname_offs(sym, NULL, fp); 289 } 290 291 void symbols__delete(struct rb_root *symbols) 292 { 293 struct symbol *pos; 294 struct rb_node *next = rb_first(symbols); 295 296 while (next) { 297 pos = rb_entry(next, struct symbol, rb_node); 298 next = rb_next(&pos->rb_node); 299 rb_erase(&pos->rb_node, symbols); 300 symbol__delete(pos); 301 } 302 } 303 304 void symbols__insert(struct rb_root *symbols, struct symbol *sym) 305 { 306 struct rb_node **p = &symbols->rb_node; 307 struct rb_node *parent = NULL; 308 const u64 ip = sym->start; 309 struct symbol *s; 310 311 while (*p != NULL) { 312 parent = *p; 313 s = rb_entry(parent, struct symbol, rb_node); 314 if (ip < s->start) 315 p = &(*p)->rb_left; 316 else 317 p = &(*p)->rb_right; 318 } 319 rb_link_node(&sym->rb_node, parent, p); 320 rb_insert_color(&sym->rb_node, symbols); 321 } 322 323 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip) 324 { 325 struct rb_node *n; 326 327 if (symbols == NULL) 328 return NULL; 329 330 n = symbols->rb_node; 331 332 while (n) { 333 struct symbol *s = rb_entry(n, struct symbol, rb_node); 334 335 if (ip < s->start) 336 n = n->rb_left; 337 else if (ip >= s->end) 338 n = n->rb_right; 339 else 340 return s; 341 } 342 343 return NULL; 344 } 345 346 static struct symbol *symbols__first(struct rb_root *symbols) 347 { 348 struct rb_node *n = rb_first(symbols); 349 350 if (n) 351 return rb_entry(n, struct symbol, rb_node); 352 353 return NULL; 354 } 355 356 static struct symbol *symbols__next(struct symbol *sym) 357 { 358 struct rb_node *n = rb_next(&sym->rb_node); 359 360 if (n) 361 return rb_entry(n, struct symbol, rb_node); 362 363 return NULL; 364 } 365 366 struct symbol_name_rb_node { 367 struct rb_node rb_node; 368 struct symbol sym; 369 }; 370 371 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym) 372 { 373 struct rb_node **p = &symbols->rb_node; 374 struct rb_node *parent = NULL; 375 struct symbol_name_rb_node *symn, *s; 376 377 symn = container_of(sym, struct symbol_name_rb_node, sym); 378 379 while (*p != NULL) { 380 parent = *p; 381 s = rb_entry(parent, struct symbol_name_rb_node, rb_node); 382 if (strcmp(sym->name, s->sym.name) < 0) 383 p = &(*p)->rb_left; 384 else 385 p = &(*p)->rb_right; 386 } 387 rb_link_node(&symn->rb_node, parent, p); 388 rb_insert_color(&symn->rb_node, symbols); 389 } 390 391 static void symbols__sort_by_name(struct rb_root *symbols, 392 struct rb_root *source) 393 { 394 struct rb_node *nd; 395 396 for (nd = rb_first(source); nd; nd = rb_next(nd)) { 397 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 398 symbols__insert_by_name(symbols, pos); 399 } 400 } 401 402 static struct symbol *symbols__find_by_name(struct rb_root *symbols, 403 const char *name) 404 { 405 struct rb_node *n; 406 struct symbol_name_rb_node *s = NULL; 407 408 if (symbols == NULL) 409 return NULL; 410 411 n = symbols->rb_node; 412 413 while (n) { 414 int cmp; 415 416 s = rb_entry(n, struct symbol_name_rb_node, rb_node); 417 cmp = arch__compare_symbol_names(name, s->sym.name); 418 419 if (cmp < 0) 420 n = n->rb_left; 421 else if (cmp > 0) 422 n = n->rb_right; 423 else 424 break; 425 } 426 427 if (n == NULL) 428 return NULL; 429 430 /* return first symbol that has same name (if any) */ 431 for (n = rb_prev(n); n; n = rb_prev(n)) { 432 struct symbol_name_rb_node *tmp; 433 434 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node); 435 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name)) 436 break; 437 438 s = tmp; 439 } 440 441 return &s->sym; 442 } 443 444 struct symbol *dso__find_symbol(struct dso *dso, 445 enum map_type type, u64 addr) 446 { 447 if (dso->last_find_result[type].addr != addr) { 448 dso->last_find_result[type].addr = addr; 449 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr); 450 } 451 452 return dso->last_find_result[type].symbol; 453 } 454 455 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type) 456 { 457 return symbols__first(&dso->symbols[type]); 458 } 459 460 struct symbol *dso__next_symbol(struct symbol *sym) 461 { 462 return symbols__next(sym); 463 } 464 465 struct symbol *symbol__next_by_name(struct symbol *sym) 466 { 467 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym); 468 struct rb_node *n = rb_next(&s->rb_node); 469 470 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL; 471 } 472 473 /* 474 * Teturns first symbol that matched with @name. 475 */ 476 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type, 477 const char *name) 478 { 479 return symbols__find_by_name(&dso->symbol_names[type], name); 480 } 481 482 void dso__sort_by_name(struct dso *dso, enum map_type type) 483 { 484 dso__set_sorted_by_name(dso, type); 485 return symbols__sort_by_name(&dso->symbol_names[type], 486 &dso->symbols[type]); 487 } 488 489 size_t dso__fprintf_symbols_by_name(struct dso *dso, 490 enum map_type type, FILE *fp) 491 { 492 size_t ret = 0; 493 struct rb_node *nd; 494 struct symbol_name_rb_node *pos; 495 496 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) { 497 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 498 fprintf(fp, "%s\n", pos->sym.name); 499 } 500 501 return ret; 502 } 503 504 int modules__parse(const char *filename, void *arg, 505 int (*process_module)(void *arg, const char *name, 506 u64 start)) 507 { 508 char *line = NULL; 509 size_t n; 510 FILE *file; 511 int err = 0; 512 513 file = fopen(filename, "r"); 514 if (file == NULL) 515 return -1; 516 517 while (1) { 518 char name[PATH_MAX]; 519 u64 start; 520 char *sep; 521 ssize_t line_len; 522 523 line_len = getline(&line, &n, file); 524 if (line_len < 0) { 525 if (feof(file)) 526 break; 527 err = -1; 528 goto out; 529 } 530 531 if (!line) { 532 err = -1; 533 goto out; 534 } 535 536 line[--line_len] = '\0'; /* \n */ 537 538 sep = strrchr(line, 'x'); 539 if (sep == NULL) 540 continue; 541 542 hex2u64(sep + 1, &start); 543 544 sep = strchr(line, ' '); 545 if (sep == NULL) 546 continue; 547 548 *sep = '\0'; 549 550 scnprintf(name, sizeof(name), "[%s]", line); 551 552 err = process_module(arg, name, start); 553 if (err) 554 break; 555 } 556 out: 557 free(line); 558 fclose(file); 559 return err; 560 } 561 562 struct process_kallsyms_args { 563 struct map *map; 564 struct dso *dso; 565 }; 566 567 /* 568 * These are symbols in the kernel image, so make sure that 569 * sym is from a kernel DSO. 570 */ 571 bool symbol__is_idle(struct symbol *sym) 572 { 573 const char * const idle_symbols[] = { 574 "cpu_idle", 575 "cpu_startup_entry", 576 "intel_idle", 577 "default_idle", 578 "native_safe_halt", 579 "enter_idle", 580 "exit_idle", 581 "mwait_idle", 582 "mwait_idle_with_hints", 583 "poll_idle", 584 "ppc64_runlatch_off", 585 "pseries_dedicated_idle_sleep", 586 NULL 587 }; 588 589 int i; 590 591 if (!sym) 592 return false; 593 594 for (i = 0; idle_symbols[i]; i++) { 595 if (!strcmp(idle_symbols[i], sym->name)) 596 return true; 597 } 598 599 return false; 600 } 601 602 static int map__process_kallsym_symbol(void *arg, const char *name, 603 char type, u64 start) 604 { 605 struct symbol *sym; 606 struct process_kallsyms_args *a = arg; 607 struct rb_root *root = &a->dso->symbols[a->map->type]; 608 609 if (!symbol_type__is_a(type, a->map->type)) 610 return 0; 611 612 /* 613 * module symbols are not sorted so we add all 614 * symbols, setting length to 0, and rely on 615 * symbols__fixup_end() to fix it up. 616 */ 617 sym = symbol__new(start, 0, kallsyms2elf_type(type), name); 618 if (sym == NULL) 619 return -ENOMEM; 620 /* 621 * We will pass the symbols to the filter later, in 622 * map__split_kallsyms, when we have split the maps per module 623 */ 624 symbols__insert(root, sym); 625 626 return 0; 627 } 628 629 /* 630 * Loads the function entries in /proc/kallsyms into kernel_map->dso, 631 * so that we can in the next step set the symbol ->end address and then 632 * call kernel_maps__split_kallsyms. 633 */ 634 static int dso__load_all_kallsyms(struct dso *dso, const char *filename, 635 struct map *map) 636 { 637 struct process_kallsyms_args args = { .map = map, .dso = dso, }; 638 return kallsyms__parse(filename, &args, map__process_kallsym_symbol); 639 } 640 641 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map, 642 symbol_filter_t filter) 643 { 644 struct map_groups *kmaps = map__kmaps(map); 645 struct map *curr_map; 646 struct symbol *pos; 647 int count = 0, moved = 0; 648 struct rb_root *root = &dso->symbols[map->type]; 649 struct rb_node *next = rb_first(root); 650 651 if (!kmaps) 652 return -1; 653 654 while (next) { 655 char *module; 656 657 pos = rb_entry(next, struct symbol, rb_node); 658 next = rb_next(&pos->rb_node); 659 660 module = strchr(pos->name, '\t'); 661 if (module) 662 *module = '\0'; 663 664 curr_map = map_groups__find(kmaps, map->type, pos->start); 665 666 if (!curr_map || (filter && filter(curr_map, pos))) { 667 rb_erase_init(&pos->rb_node, root); 668 symbol__delete(pos); 669 } else { 670 pos->start -= curr_map->start - curr_map->pgoff; 671 if (pos->end) 672 pos->end -= curr_map->start - curr_map->pgoff; 673 if (curr_map != map) { 674 rb_erase_init(&pos->rb_node, root); 675 symbols__insert( 676 &curr_map->dso->symbols[curr_map->type], 677 pos); 678 ++moved; 679 } else { 680 ++count; 681 } 682 } 683 } 684 685 /* Symbols have been adjusted */ 686 dso->adjust_symbols = 1; 687 688 return count + moved; 689 } 690 691 /* 692 * Split the symbols into maps, making sure there are no overlaps, i.e. the 693 * kernel range is broken in several maps, named [kernel].N, as we don't have 694 * the original ELF section names vmlinux have. 695 */ 696 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta, 697 symbol_filter_t filter) 698 { 699 struct map_groups *kmaps = map__kmaps(map); 700 struct machine *machine; 701 struct map *curr_map = map; 702 struct symbol *pos; 703 int count = 0, moved = 0; 704 struct rb_root *root = &dso->symbols[map->type]; 705 struct rb_node *next = rb_first(root); 706 int kernel_range = 0; 707 708 if (!kmaps) 709 return -1; 710 711 machine = kmaps->machine; 712 713 while (next) { 714 char *module; 715 716 pos = rb_entry(next, struct symbol, rb_node); 717 next = rb_next(&pos->rb_node); 718 719 module = strchr(pos->name, '\t'); 720 if (module) { 721 if (!symbol_conf.use_modules) 722 goto discard_symbol; 723 724 *module++ = '\0'; 725 726 if (strcmp(curr_map->dso->short_name, module)) { 727 if (curr_map != map && 728 dso->kernel == DSO_TYPE_GUEST_KERNEL && 729 machine__is_default_guest(machine)) { 730 /* 731 * We assume all symbols of a module are 732 * continuous in * kallsyms, so curr_map 733 * points to a module and all its 734 * symbols are in its kmap. Mark it as 735 * loaded. 736 */ 737 dso__set_loaded(curr_map->dso, 738 curr_map->type); 739 } 740 741 curr_map = map_groups__find_by_name(kmaps, 742 map->type, module); 743 if (curr_map == NULL) { 744 pr_debug("%s/proc/{kallsyms,modules} " 745 "inconsistency while looking " 746 "for \"%s\" module!\n", 747 machine->root_dir, module); 748 curr_map = map; 749 goto discard_symbol; 750 } 751 752 if (curr_map->dso->loaded && 753 !machine__is_default_guest(machine)) 754 goto discard_symbol; 755 } 756 /* 757 * So that we look just like we get from .ko files, 758 * i.e. not prelinked, relative to map->start. 759 */ 760 pos->start = curr_map->map_ip(curr_map, pos->start); 761 pos->end = curr_map->map_ip(curr_map, pos->end); 762 } else if (curr_map != map) { 763 char dso_name[PATH_MAX]; 764 struct dso *ndso; 765 766 if (delta) { 767 /* Kernel was relocated at boot time */ 768 pos->start -= delta; 769 pos->end -= delta; 770 } 771 772 if (count == 0) { 773 curr_map = map; 774 goto filter_symbol; 775 } 776 777 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 778 snprintf(dso_name, sizeof(dso_name), 779 "[guest.kernel].%d", 780 kernel_range++); 781 else 782 snprintf(dso_name, sizeof(dso_name), 783 "[kernel].%d", 784 kernel_range++); 785 786 ndso = dso__new(dso_name); 787 if (ndso == NULL) 788 return -1; 789 790 ndso->kernel = dso->kernel; 791 792 curr_map = map__new2(pos->start, ndso, map->type); 793 if (curr_map == NULL) { 794 dso__put(ndso); 795 return -1; 796 } 797 798 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; 799 map_groups__insert(kmaps, curr_map); 800 ++kernel_range; 801 } else if (delta) { 802 /* Kernel was relocated at boot time */ 803 pos->start -= delta; 804 pos->end -= delta; 805 } 806 filter_symbol: 807 if (filter && filter(curr_map, pos)) { 808 discard_symbol: rb_erase(&pos->rb_node, root); 809 symbol__delete(pos); 810 } else { 811 if (curr_map != map) { 812 rb_erase(&pos->rb_node, root); 813 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); 814 ++moved; 815 } else 816 ++count; 817 } 818 } 819 820 if (curr_map != map && 821 dso->kernel == DSO_TYPE_GUEST_KERNEL && 822 machine__is_default_guest(kmaps->machine)) { 823 dso__set_loaded(curr_map->dso, curr_map->type); 824 } 825 826 return count + moved; 827 } 828 829 bool symbol__restricted_filename(const char *filename, 830 const char *restricted_filename) 831 { 832 bool restricted = false; 833 834 if (symbol_conf.kptr_restrict) { 835 char *r = realpath(filename, NULL); 836 837 if (r != NULL) { 838 restricted = strcmp(r, restricted_filename) == 0; 839 free(r); 840 return restricted; 841 } 842 } 843 844 return restricted; 845 } 846 847 struct module_info { 848 struct rb_node rb_node; 849 char *name; 850 u64 start; 851 }; 852 853 static void add_module(struct module_info *mi, struct rb_root *modules) 854 { 855 struct rb_node **p = &modules->rb_node; 856 struct rb_node *parent = NULL; 857 struct module_info *m; 858 859 while (*p != NULL) { 860 parent = *p; 861 m = rb_entry(parent, struct module_info, rb_node); 862 if (strcmp(mi->name, m->name) < 0) 863 p = &(*p)->rb_left; 864 else 865 p = &(*p)->rb_right; 866 } 867 rb_link_node(&mi->rb_node, parent, p); 868 rb_insert_color(&mi->rb_node, modules); 869 } 870 871 static void delete_modules(struct rb_root *modules) 872 { 873 struct module_info *mi; 874 struct rb_node *next = rb_first(modules); 875 876 while (next) { 877 mi = rb_entry(next, struct module_info, rb_node); 878 next = rb_next(&mi->rb_node); 879 rb_erase(&mi->rb_node, modules); 880 zfree(&mi->name); 881 free(mi); 882 } 883 } 884 885 static struct module_info *find_module(const char *name, 886 struct rb_root *modules) 887 { 888 struct rb_node *n = modules->rb_node; 889 890 while (n) { 891 struct module_info *m; 892 int cmp; 893 894 m = rb_entry(n, struct module_info, rb_node); 895 cmp = strcmp(name, m->name); 896 if (cmp < 0) 897 n = n->rb_left; 898 else if (cmp > 0) 899 n = n->rb_right; 900 else 901 return m; 902 } 903 904 return NULL; 905 } 906 907 static int __read_proc_modules(void *arg, const char *name, u64 start) 908 { 909 struct rb_root *modules = arg; 910 struct module_info *mi; 911 912 mi = zalloc(sizeof(struct module_info)); 913 if (!mi) 914 return -ENOMEM; 915 916 mi->name = strdup(name); 917 mi->start = start; 918 919 if (!mi->name) { 920 free(mi); 921 return -ENOMEM; 922 } 923 924 add_module(mi, modules); 925 926 return 0; 927 } 928 929 static int read_proc_modules(const char *filename, struct rb_root *modules) 930 { 931 if (symbol__restricted_filename(filename, "/proc/modules")) 932 return -1; 933 934 if (modules__parse(filename, modules, __read_proc_modules)) { 935 delete_modules(modules); 936 return -1; 937 } 938 939 return 0; 940 } 941 942 int compare_proc_modules(const char *from, const char *to) 943 { 944 struct rb_root from_modules = RB_ROOT; 945 struct rb_root to_modules = RB_ROOT; 946 struct rb_node *from_node, *to_node; 947 struct module_info *from_m, *to_m; 948 int ret = -1; 949 950 if (read_proc_modules(from, &from_modules)) 951 return -1; 952 953 if (read_proc_modules(to, &to_modules)) 954 goto out_delete_from; 955 956 from_node = rb_first(&from_modules); 957 to_node = rb_first(&to_modules); 958 while (from_node) { 959 if (!to_node) 960 break; 961 962 from_m = rb_entry(from_node, struct module_info, rb_node); 963 to_m = rb_entry(to_node, struct module_info, rb_node); 964 965 if (from_m->start != to_m->start || 966 strcmp(from_m->name, to_m->name)) 967 break; 968 969 from_node = rb_next(from_node); 970 to_node = rb_next(to_node); 971 } 972 973 if (!from_node && !to_node) 974 ret = 0; 975 976 delete_modules(&to_modules); 977 out_delete_from: 978 delete_modules(&from_modules); 979 980 return ret; 981 } 982 983 static int do_validate_kcore_modules(const char *filename, struct map *map, 984 struct map_groups *kmaps) 985 { 986 struct rb_root modules = RB_ROOT; 987 struct map *old_map; 988 int err; 989 990 err = read_proc_modules(filename, &modules); 991 if (err) 992 return err; 993 994 old_map = map_groups__first(kmaps, map->type); 995 while (old_map) { 996 struct map *next = map_groups__next(old_map); 997 struct module_info *mi; 998 999 if (old_map == map || old_map->start == map->start) { 1000 /* The kernel map */ 1001 old_map = next; 1002 continue; 1003 } 1004 1005 /* Module must be in memory at the same address */ 1006 mi = find_module(old_map->dso->short_name, &modules); 1007 if (!mi || mi->start != old_map->start) { 1008 err = -EINVAL; 1009 goto out; 1010 } 1011 1012 old_map = next; 1013 } 1014 out: 1015 delete_modules(&modules); 1016 return err; 1017 } 1018 1019 /* 1020 * If kallsyms is referenced by name then we look for filename in the same 1021 * directory. 1022 */ 1023 static bool filename_from_kallsyms_filename(char *filename, 1024 const char *base_name, 1025 const char *kallsyms_filename) 1026 { 1027 char *name; 1028 1029 strcpy(filename, kallsyms_filename); 1030 name = strrchr(filename, '/'); 1031 if (!name) 1032 return false; 1033 1034 name += 1; 1035 1036 if (!strcmp(name, "kallsyms")) { 1037 strcpy(name, base_name); 1038 return true; 1039 } 1040 1041 return false; 1042 } 1043 1044 static int validate_kcore_modules(const char *kallsyms_filename, 1045 struct map *map) 1046 { 1047 struct map_groups *kmaps = map__kmaps(map); 1048 char modules_filename[PATH_MAX]; 1049 1050 if (!kmaps) 1051 return -EINVAL; 1052 1053 if (!filename_from_kallsyms_filename(modules_filename, "modules", 1054 kallsyms_filename)) 1055 return -EINVAL; 1056 1057 if (do_validate_kcore_modules(modules_filename, map, kmaps)) 1058 return -EINVAL; 1059 1060 return 0; 1061 } 1062 1063 static int validate_kcore_addresses(const char *kallsyms_filename, 1064 struct map *map) 1065 { 1066 struct kmap *kmap = map__kmap(map); 1067 1068 if (!kmap) 1069 return -EINVAL; 1070 1071 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) { 1072 u64 start; 1073 1074 start = kallsyms__get_function_start(kallsyms_filename, 1075 kmap->ref_reloc_sym->name); 1076 if (start != kmap->ref_reloc_sym->addr) 1077 return -EINVAL; 1078 } 1079 1080 return validate_kcore_modules(kallsyms_filename, map); 1081 } 1082 1083 struct kcore_mapfn_data { 1084 struct dso *dso; 1085 enum map_type type; 1086 struct list_head maps; 1087 }; 1088 1089 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) 1090 { 1091 struct kcore_mapfn_data *md = data; 1092 struct map *map; 1093 1094 map = map__new2(start, md->dso, md->type); 1095 if (map == NULL) 1096 return -ENOMEM; 1097 1098 map->end = map->start + len; 1099 map->pgoff = pgoff; 1100 1101 list_add(&map->node, &md->maps); 1102 1103 return 0; 1104 } 1105 1106 static int dso__load_kcore(struct dso *dso, struct map *map, 1107 const char *kallsyms_filename) 1108 { 1109 struct map_groups *kmaps = map__kmaps(map); 1110 struct machine *machine; 1111 struct kcore_mapfn_data md; 1112 struct map *old_map, *new_map, *replacement_map = NULL; 1113 bool is_64_bit; 1114 int err, fd; 1115 char kcore_filename[PATH_MAX]; 1116 struct symbol *sym; 1117 1118 if (!kmaps) 1119 return -EINVAL; 1120 1121 machine = kmaps->machine; 1122 1123 /* This function requires that the map is the kernel map */ 1124 if (map != machine->vmlinux_maps[map->type]) 1125 return -EINVAL; 1126 1127 if (!filename_from_kallsyms_filename(kcore_filename, "kcore", 1128 kallsyms_filename)) 1129 return -EINVAL; 1130 1131 /* Modules and kernel must be present at their original addresses */ 1132 if (validate_kcore_addresses(kallsyms_filename, map)) 1133 return -EINVAL; 1134 1135 md.dso = dso; 1136 md.type = map->type; 1137 INIT_LIST_HEAD(&md.maps); 1138 1139 fd = open(kcore_filename, O_RDONLY); 1140 if (fd < 0) { 1141 pr_err("%s requires CAP_SYS_RAWIO capability to access.\n", 1142 kcore_filename); 1143 return -EINVAL; 1144 } 1145 1146 /* Read new maps into temporary lists */ 1147 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md, 1148 &is_64_bit); 1149 if (err) 1150 goto out_err; 1151 dso->is_64_bit = is_64_bit; 1152 1153 if (list_empty(&md.maps)) { 1154 err = -EINVAL; 1155 goto out_err; 1156 } 1157 1158 /* Remove old maps */ 1159 old_map = map_groups__first(kmaps, map->type); 1160 while (old_map) { 1161 struct map *next = map_groups__next(old_map); 1162 1163 if (old_map != map) 1164 map_groups__remove(kmaps, old_map); 1165 old_map = next; 1166 } 1167 1168 /* Find the kernel map using the first symbol */ 1169 sym = dso__first_symbol(dso, map->type); 1170 list_for_each_entry(new_map, &md.maps, node) { 1171 if (sym && sym->start >= new_map->start && 1172 sym->start < new_map->end) { 1173 replacement_map = new_map; 1174 break; 1175 } 1176 } 1177 1178 if (!replacement_map) 1179 replacement_map = list_entry(md.maps.next, struct map, node); 1180 1181 /* Add new maps */ 1182 while (!list_empty(&md.maps)) { 1183 new_map = list_entry(md.maps.next, struct map, node); 1184 list_del_init(&new_map->node); 1185 if (new_map == replacement_map) { 1186 map->start = new_map->start; 1187 map->end = new_map->end; 1188 map->pgoff = new_map->pgoff; 1189 map->map_ip = new_map->map_ip; 1190 map->unmap_ip = new_map->unmap_ip; 1191 /* Ensure maps are correctly ordered */ 1192 map__get(map); 1193 map_groups__remove(kmaps, map); 1194 map_groups__insert(kmaps, map); 1195 map__put(map); 1196 } else { 1197 map_groups__insert(kmaps, new_map); 1198 } 1199 1200 map__put(new_map); 1201 } 1202 1203 /* 1204 * Set the data type and long name so that kcore can be read via 1205 * dso__data_read_addr(). 1206 */ 1207 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1208 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE; 1209 else 1210 dso->binary_type = DSO_BINARY_TYPE__KCORE; 1211 dso__set_long_name(dso, strdup(kcore_filename), true); 1212 1213 close(fd); 1214 1215 if (map->type == MAP__FUNCTION) 1216 pr_debug("Using %s for kernel object code\n", kcore_filename); 1217 else 1218 pr_debug("Using %s for kernel data\n", kcore_filename); 1219 1220 return 0; 1221 1222 out_err: 1223 while (!list_empty(&md.maps)) { 1224 map = list_entry(md.maps.next, struct map, node); 1225 list_del_init(&map->node); 1226 map__put(map); 1227 } 1228 close(fd); 1229 return -EINVAL; 1230 } 1231 1232 /* 1233 * If the kernel is relocated at boot time, kallsyms won't match. Compute the 1234 * delta based on the relocation reference symbol. 1235 */ 1236 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta) 1237 { 1238 struct kmap *kmap = map__kmap(map); 1239 u64 addr; 1240 1241 if (!kmap) 1242 return -1; 1243 1244 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) 1245 return 0; 1246 1247 addr = kallsyms__get_function_start(filename, 1248 kmap->ref_reloc_sym->name); 1249 if (!addr) 1250 return -1; 1251 1252 *delta = addr - kmap->ref_reloc_sym->addr; 1253 return 0; 1254 } 1255 1256 int dso__load_kallsyms(struct dso *dso, const char *filename, 1257 struct map *map, symbol_filter_t filter) 1258 { 1259 u64 delta = 0; 1260 1261 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 1262 return -1; 1263 1264 if (dso__load_all_kallsyms(dso, filename, map) < 0) 1265 return -1; 1266 1267 if (kallsyms__delta(map, filename, &delta)) 1268 return -1; 1269 1270 symbols__fixup_duplicate(&dso->symbols[map->type]); 1271 symbols__fixup_end(&dso->symbols[map->type]); 1272 1273 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1274 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1275 else 1276 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; 1277 1278 if (!dso__load_kcore(dso, map, filename)) 1279 return dso__split_kallsyms_for_kcore(dso, map, filter); 1280 else 1281 return dso__split_kallsyms(dso, map, delta, filter); 1282 } 1283 1284 static int dso__load_perf_map(struct dso *dso, struct map *map, 1285 symbol_filter_t filter) 1286 { 1287 char *line = NULL; 1288 size_t n; 1289 FILE *file; 1290 int nr_syms = 0; 1291 1292 file = fopen(dso->long_name, "r"); 1293 if (file == NULL) 1294 goto out_failure; 1295 1296 while (!feof(file)) { 1297 u64 start, size; 1298 struct symbol *sym; 1299 int line_len, len; 1300 1301 line_len = getline(&line, &n, file); 1302 if (line_len < 0) 1303 break; 1304 1305 if (!line) 1306 goto out_failure; 1307 1308 line[--line_len] = '\0'; /* \n */ 1309 1310 len = hex2u64(line, &start); 1311 1312 len++; 1313 if (len + 2 >= line_len) 1314 continue; 1315 1316 len += hex2u64(line + len, &size); 1317 1318 len++; 1319 if (len + 2 >= line_len) 1320 continue; 1321 1322 sym = symbol__new(start, size, STB_GLOBAL, line + len); 1323 1324 if (sym == NULL) 1325 goto out_delete_line; 1326 1327 if (filter && filter(map, sym)) 1328 symbol__delete(sym); 1329 else { 1330 symbols__insert(&dso->symbols[map->type], sym); 1331 nr_syms++; 1332 } 1333 } 1334 1335 free(line); 1336 fclose(file); 1337 1338 return nr_syms; 1339 1340 out_delete_line: 1341 free(line); 1342 out_failure: 1343 return -1; 1344 } 1345 1346 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, 1347 enum dso_binary_type type) 1348 { 1349 switch (type) { 1350 case DSO_BINARY_TYPE__JAVA_JIT: 1351 case DSO_BINARY_TYPE__DEBUGLINK: 1352 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO: 1353 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO: 1354 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO: 1355 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO: 1356 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: 1357 return !kmod && dso->kernel == DSO_TYPE_USER; 1358 1359 case DSO_BINARY_TYPE__KALLSYMS: 1360 case DSO_BINARY_TYPE__VMLINUX: 1361 case DSO_BINARY_TYPE__KCORE: 1362 return dso->kernel == DSO_TYPE_KERNEL; 1363 1364 case DSO_BINARY_TYPE__GUEST_KALLSYMS: 1365 case DSO_BINARY_TYPE__GUEST_VMLINUX: 1366 case DSO_BINARY_TYPE__GUEST_KCORE: 1367 return dso->kernel == DSO_TYPE_GUEST_KERNEL; 1368 1369 case DSO_BINARY_TYPE__GUEST_KMODULE: 1370 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP: 1371 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE: 1372 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP: 1373 /* 1374 * kernel modules know their symtab type - it's set when 1375 * creating a module dso in machine__findnew_module_map(). 1376 */ 1377 return kmod && dso->symtab_type == type; 1378 1379 case DSO_BINARY_TYPE__BUILD_ID_CACHE: 1380 return true; 1381 1382 case DSO_BINARY_TYPE__NOT_FOUND: 1383 default: 1384 return false; 1385 } 1386 } 1387 1388 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) 1389 { 1390 char *name; 1391 int ret = -1; 1392 u_int i; 1393 struct machine *machine; 1394 char *root_dir = (char *) ""; 1395 int ss_pos = 0; 1396 struct symsrc ss_[2]; 1397 struct symsrc *syms_ss = NULL, *runtime_ss = NULL; 1398 bool kmod; 1399 1400 pthread_mutex_lock(&dso->lock); 1401 1402 /* check again under the dso->lock */ 1403 if (dso__loaded(dso, map->type)) { 1404 ret = 1; 1405 goto out; 1406 } 1407 1408 if (dso->kernel) { 1409 if (dso->kernel == DSO_TYPE_KERNEL) 1410 ret = dso__load_kernel_sym(dso, map, filter); 1411 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1412 ret = dso__load_guest_kernel_sym(dso, map, filter); 1413 1414 goto out; 1415 } 1416 1417 if (map->groups && map->groups->machine) 1418 machine = map->groups->machine; 1419 else 1420 machine = NULL; 1421 1422 dso->adjust_symbols = 0; 1423 1424 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) { 1425 struct stat st; 1426 1427 if (lstat(dso->name, &st) < 0) 1428 goto out; 1429 1430 if (st.st_uid && (st.st_uid != geteuid())) { 1431 pr_warning("File %s not owned by current user or root, " 1432 "ignoring it.\n", dso->name); 1433 goto out; 1434 } 1435 1436 ret = dso__load_perf_map(dso, map, filter); 1437 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : 1438 DSO_BINARY_TYPE__NOT_FOUND; 1439 goto out; 1440 } 1441 1442 if (machine) 1443 root_dir = machine->root_dir; 1444 1445 name = malloc(PATH_MAX); 1446 if (!name) 1447 goto out; 1448 1449 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || 1450 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP || 1451 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || 1452 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; 1453 1454 /* 1455 * Iterate over candidate debug images. 1456 * Keep track of "interesting" ones (those which have a symtab, dynsym, 1457 * and/or opd section) for processing. 1458 */ 1459 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { 1460 struct symsrc *ss = &ss_[ss_pos]; 1461 bool next_slot = false; 1462 1463 enum dso_binary_type symtab_type = binary_type_symtab[i]; 1464 1465 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type)) 1466 continue; 1467 1468 if (dso__read_binary_type_filename(dso, symtab_type, 1469 root_dir, name, PATH_MAX)) 1470 continue; 1471 1472 /* Name is now the name of the next image to try */ 1473 if (symsrc__init(ss, dso, name, symtab_type) < 0) 1474 continue; 1475 1476 if (!syms_ss && symsrc__has_symtab(ss)) { 1477 syms_ss = ss; 1478 next_slot = true; 1479 if (!dso->symsrc_filename) 1480 dso->symsrc_filename = strdup(name); 1481 } 1482 1483 if (!runtime_ss && symsrc__possibly_runtime(ss)) { 1484 runtime_ss = ss; 1485 next_slot = true; 1486 } 1487 1488 if (next_slot) { 1489 ss_pos++; 1490 1491 if (syms_ss && runtime_ss) 1492 break; 1493 } else { 1494 symsrc__destroy(ss); 1495 } 1496 1497 } 1498 1499 if (!runtime_ss && !syms_ss) 1500 goto out_free; 1501 1502 if (runtime_ss && !syms_ss) { 1503 syms_ss = runtime_ss; 1504 } 1505 1506 /* We'll have to hope for the best */ 1507 if (!runtime_ss && syms_ss) 1508 runtime_ss = syms_ss; 1509 1510 if (syms_ss) 1511 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod); 1512 else 1513 ret = -1; 1514 1515 if (ret > 0) { 1516 int nr_plt; 1517 1518 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter); 1519 if (nr_plt > 0) 1520 ret += nr_plt; 1521 } 1522 1523 for (; ss_pos > 0; ss_pos--) 1524 symsrc__destroy(&ss_[ss_pos - 1]); 1525 out_free: 1526 free(name); 1527 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) 1528 ret = 0; 1529 out: 1530 dso__set_loaded(dso, map->type); 1531 pthread_mutex_unlock(&dso->lock); 1532 1533 return ret; 1534 } 1535 1536 struct map *map_groups__find_by_name(struct map_groups *mg, 1537 enum map_type type, const char *name) 1538 { 1539 struct maps *maps = &mg->maps[type]; 1540 struct map *map; 1541 1542 pthread_rwlock_rdlock(&maps->lock); 1543 1544 for (map = maps__first(maps); map; map = map__next(map)) { 1545 if (map->dso && strcmp(map->dso->short_name, name) == 0) 1546 goto out_unlock; 1547 } 1548 1549 map = NULL; 1550 1551 out_unlock: 1552 pthread_rwlock_unlock(&maps->lock); 1553 return map; 1554 } 1555 1556 int dso__load_vmlinux(struct dso *dso, struct map *map, 1557 const char *vmlinux, bool vmlinux_allocated, 1558 symbol_filter_t filter) 1559 { 1560 int err = -1; 1561 struct symsrc ss; 1562 char symfs_vmlinux[PATH_MAX]; 1563 enum dso_binary_type symtab_type; 1564 1565 if (vmlinux[0] == '/') 1566 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux); 1567 else 1568 symbol__join_symfs(symfs_vmlinux, vmlinux); 1569 1570 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1571 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1572 else 1573 symtab_type = DSO_BINARY_TYPE__VMLINUX; 1574 1575 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) 1576 return -1; 1577 1578 err = dso__load_sym(dso, map, &ss, &ss, filter, 0); 1579 symsrc__destroy(&ss); 1580 1581 if (err > 0) { 1582 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1583 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1584 else 1585 dso->binary_type = DSO_BINARY_TYPE__VMLINUX; 1586 dso__set_long_name(dso, vmlinux, vmlinux_allocated); 1587 dso__set_loaded(dso, map->type); 1588 pr_debug("Using %s for symbols\n", symfs_vmlinux); 1589 } 1590 1591 return err; 1592 } 1593 1594 int dso__load_vmlinux_path(struct dso *dso, struct map *map, 1595 symbol_filter_t filter) 1596 { 1597 int i, err = 0; 1598 char *filename = NULL; 1599 1600 if (!symbol_conf.ignore_vmlinux_buildid) 1601 filename = dso__build_id_filename(dso, NULL, 0); 1602 if (filename != NULL) { 1603 err = dso__load_vmlinux(dso, map, filename, true, filter); 1604 if (err > 0) 1605 goto out; 1606 free(filename); 1607 } 1608 1609 pr_debug("Looking at the vmlinux_path (%d entries long)\n", 1610 vmlinux_path__nr_entries + 1); 1611 1612 for (i = 0; i < vmlinux_path__nr_entries; ++i) { 1613 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter); 1614 if (err > 0) 1615 break; 1616 } 1617 out: 1618 return err; 1619 } 1620 1621 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) 1622 { 1623 char kallsyms_filename[PATH_MAX]; 1624 struct dirent *dent; 1625 int ret = -1; 1626 DIR *d; 1627 1628 d = opendir(dir); 1629 if (!d) 1630 return -1; 1631 1632 while (1) { 1633 dent = readdir(d); 1634 if (!dent) 1635 break; 1636 if (dent->d_type != DT_DIR) 1637 continue; 1638 scnprintf(kallsyms_filename, sizeof(kallsyms_filename), 1639 "%s/%s/kallsyms", dir, dent->d_name); 1640 if (!validate_kcore_addresses(kallsyms_filename, map)) { 1641 strlcpy(dir, kallsyms_filename, dir_sz); 1642 ret = 0; 1643 break; 1644 } 1645 } 1646 1647 closedir(d); 1648 1649 return ret; 1650 } 1651 1652 static char *dso__find_kallsyms(struct dso *dso, struct map *map) 1653 { 1654 u8 host_build_id[BUILD_ID_SIZE]; 1655 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 1656 bool is_host = false; 1657 char path[PATH_MAX]; 1658 1659 if (!dso->has_build_id) { 1660 /* 1661 * Last resort, if we don't have a build-id and couldn't find 1662 * any vmlinux file, try the running kernel kallsyms table. 1663 */ 1664 goto proc_kallsyms; 1665 } 1666 1667 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id, 1668 sizeof(host_build_id)) == 0) 1669 is_host = dso__build_id_equal(dso, host_build_id); 1670 1671 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); 1672 1673 scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir, 1674 sbuild_id); 1675 1676 /* Use /proc/kallsyms if possible */ 1677 if (is_host) { 1678 DIR *d; 1679 int fd; 1680 1681 /* If no cached kcore go with /proc/kallsyms */ 1682 d = opendir(path); 1683 if (!d) 1684 goto proc_kallsyms; 1685 closedir(d); 1686 1687 /* 1688 * Do not check the build-id cache, until we know we cannot use 1689 * /proc/kcore. 1690 */ 1691 fd = open("/proc/kcore", O_RDONLY); 1692 if (fd != -1) { 1693 close(fd); 1694 /* If module maps match go with /proc/kallsyms */ 1695 if (!validate_kcore_addresses("/proc/kallsyms", map)) 1696 goto proc_kallsyms; 1697 } 1698 1699 /* Find kallsyms in build-id cache with kcore */ 1700 if (!find_matching_kcore(map, path, sizeof(path))) 1701 return strdup(path); 1702 1703 goto proc_kallsyms; 1704 } 1705 1706 /* Find kallsyms in build-id cache with kcore */ 1707 if (!find_matching_kcore(map, path, sizeof(path))) 1708 return strdup(path); 1709 1710 scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s", 1711 buildid_dir, sbuild_id); 1712 1713 if (access(path, F_OK)) { 1714 pr_err("No kallsyms or vmlinux with build-id %s was found\n", 1715 sbuild_id); 1716 return NULL; 1717 } 1718 1719 return strdup(path); 1720 1721 proc_kallsyms: 1722 return strdup("/proc/kallsyms"); 1723 } 1724 1725 static int dso__load_kernel_sym(struct dso *dso, struct map *map, 1726 symbol_filter_t filter) 1727 { 1728 int err; 1729 const char *kallsyms_filename = NULL; 1730 char *kallsyms_allocated_filename = NULL; 1731 /* 1732 * Step 1: if the user specified a kallsyms or vmlinux filename, use 1733 * it and only it, reporting errors to the user if it cannot be used. 1734 * 1735 * For instance, try to analyse an ARM perf.data file _without_ a 1736 * build-id, or if the user specifies the wrong path to the right 1737 * vmlinux file, obviously we can't fallback to another vmlinux (a 1738 * x86_86 one, on the machine where analysis is being performed, say), 1739 * or worse, /proc/kallsyms. 1740 * 1741 * If the specified file _has_ a build-id and there is a build-id 1742 * section in the perf.data file, we will still do the expected 1743 * validation in dso__load_vmlinux and will bail out if they don't 1744 * match. 1745 */ 1746 if (symbol_conf.kallsyms_name != NULL) { 1747 kallsyms_filename = symbol_conf.kallsyms_name; 1748 goto do_kallsyms; 1749 } 1750 1751 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) { 1752 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, 1753 false, filter); 1754 } 1755 1756 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { 1757 err = dso__load_vmlinux_path(dso, map, filter); 1758 if (err > 0) 1759 return err; 1760 } 1761 1762 /* do not try local files if a symfs was given */ 1763 if (symbol_conf.symfs[0] != 0) 1764 return -1; 1765 1766 kallsyms_allocated_filename = dso__find_kallsyms(dso, map); 1767 if (!kallsyms_allocated_filename) 1768 return -1; 1769 1770 kallsyms_filename = kallsyms_allocated_filename; 1771 1772 do_kallsyms: 1773 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1774 if (err > 0) 1775 pr_debug("Using %s for symbols\n", kallsyms_filename); 1776 free(kallsyms_allocated_filename); 1777 1778 if (err > 0 && !dso__is_kcore(dso)) { 1779 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS; 1780 dso__set_long_name(dso, "[kernel.kallsyms]", false); 1781 map__fixup_start(map); 1782 map__fixup_end(map); 1783 } 1784 1785 return err; 1786 } 1787 1788 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, 1789 symbol_filter_t filter) 1790 { 1791 int err; 1792 const char *kallsyms_filename = NULL; 1793 struct machine *machine; 1794 char path[PATH_MAX]; 1795 1796 if (!map->groups) { 1797 pr_debug("Guest kernel map hasn't the point to groups\n"); 1798 return -1; 1799 } 1800 machine = map->groups->machine; 1801 1802 if (machine__is_default_guest(machine)) { 1803 /* 1804 * if the user specified a vmlinux filename, use it and only 1805 * it, reporting errors to the user if it cannot be used. 1806 * Or use file guest_kallsyms inputted by user on commandline 1807 */ 1808 if (symbol_conf.default_guest_vmlinux_name != NULL) { 1809 err = dso__load_vmlinux(dso, map, 1810 symbol_conf.default_guest_vmlinux_name, 1811 false, filter); 1812 return err; 1813 } 1814 1815 kallsyms_filename = symbol_conf.default_guest_kallsyms; 1816 if (!kallsyms_filename) 1817 return -1; 1818 } else { 1819 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 1820 kallsyms_filename = path; 1821 } 1822 1823 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1824 if (err > 0) 1825 pr_debug("Using %s for symbols\n", kallsyms_filename); 1826 if (err > 0 && !dso__is_kcore(dso)) { 1827 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1828 machine__mmap_name(machine, path, sizeof(path)); 1829 dso__set_long_name(dso, strdup(path), true); 1830 map__fixup_start(map); 1831 map__fixup_end(map); 1832 } 1833 1834 return err; 1835 } 1836 1837 static void vmlinux_path__exit(void) 1838 { 1839 while (--vmlinux_path__nr_entries >= 0) 1840 zfree(&vmlinux_path[vmlinux_path__nr_entries]); 1841 vmlinux_path__nr_entries = 0; 1842 1843 zfree(&vmlinux_path); 1844 } 1845 1846 static int vmlinux_path__init(struct perf_session_env *env) 1847 { 1848 struct utsname uts; 1849 char bf[PATH_MAX]; 1850 char *kernel_version; 1851 1852 vmlinux_path = malloc(sizeof(char *) * 6); 1853 if (vmlinux_path == NULL) 1854 return -1; 1855 1856 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux"); 1857 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1858 goto out_fail; 1859 ++vmlinux_path__nr_entries; 1860 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux"); 1861 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1862 goto out_fail; 1863 ++vmlinux_path__nr_entries; 1864 1865 /* only try kernel version if no symfs was given */ 1866 if (symbol_conf.symfs[0] != 0) 1867 return 0; 1868 1869 if (env) { 1870 kernel_version = env->os_release; 1871 } else { 1872 if (uname(&uts) < 0) 1873 goto out_fail; 1874 1875 kernel_version = uts.release; 1876 } 1877 1878 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version); 1879 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1880 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1881 goto out_fail; 1882 ++vmlinux_path__nr_entries; 1883 snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s", 1884 kernel_version); 1885 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1886 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1887 goto out_fail; 1888 ++vmlinux_path__nr_entries; 1889 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version); 1890 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1891 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1892 goto out_fail; 1893 ++vmlinux_path__nr_entries; 1894 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux", 1895 kernel_version); 1896 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1897 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1898 goto out_fail; 1899 ++vmlinux_path__nr_entries; 1900 1901 return 0; 1902 1903 out_fail: 1904 vmlinux_path__exit(); 1905 return -1; 1906 } 1907 1908 int setup_list(struct strlist **list, const char *list_str, 1909 const char *list_name) 1910 { 1911 if (list_str == NULL) 1912 return 0; 1913 1914 *list = strlist__new(list_str, NULL); 1915 if (!*list) { 1916 pr_err("problems parsing %s list\n", list_name); 1917 return -1; 1918 } 1919 1920 symbol_conf.has_filter = true; 1921 return 0; 1922 } 1923 1924 int setup_intlist(struct intlist **list, const char *list_str, 1925 const char *list_name) 1926 { 1927 if (list_str == NULL) 1928 return 0; 1929 1930 *list = intlist__new(list_str); 1931 if (!*list) { 1932 pr_err("problems parsing %s list\n", list_name); 1933 return -1; 1934 } 1935 return 0; 1936 } 1937 1938 static bool symbol__read_kptr_restrict(void) 1939 { 1940 bool value = false; 1941 1942 if (geteuid() != 0) { 1943 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); 1944 if (fp != NULL) { 1945 char line[8]; 1946 1947 if (fgets(line, sizeof(line), fp) != NULL) 1948 value = atoi(line) != 0; 1949 1950 fclose(fp); 1951 } 1952 } 1953 1954 return value; 1955 } 1956 1957 int symbol__init(struct perf_session_env *env) 1958 { 1959 const char *symfs; 1960 1961 if (symbol_conf.initialized) 1962 return 0; 1963 1964 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); 1965 1966 symbol__elf_init(); 1967 1968 if (symbol_conf.sort_by_name) 1969 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - 1970 sizeof(struct symbol)); 1971 1972 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0) 1973 return -1; 1974 1975 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { 1976 pr_err("'.' is the only non valid --field-separator argument\n"); 1977 return -1; 1978 } 1979 1980 if (setup_list(&symbol_conf.dso_list, 1981 symbol_conf.dso_list_str, "dso") < 0) 1982 return -1; 1983 1984 if (setup_list(&symbol_conf.comm_list, 1985 symbol_conf.comm_list_str, "comm") < 0) 1986 goto out_free_dso_list; 1987 1988 if (setup_intlist(&symbol_conf.pid_list, 1989 symbol_conf.pid_list_str, "pid") < 0) 1990 goto out_free_comm_list; 1991 1992 if (setup_intlist(&symbol_conf.tid_list, 1993 symbol_conf.tid_list_str, "tid") < 0) 1994 goto out_free_pid_list; 1995 1996 if (setup_list(&symbol_conf.sym_list, 1997 symbol_conf.sym_list_str, "symbol") < 0) 1998 goto out_free_tid_list; 1999 2000 /* 2001 * A path to symbols of "/" is identical to "" 2002 * reset here for simplicity. 2003 */ 2004 symfs = realpath(symbol_conf.symfs, NULL); 2005 if (symfs == NULL) 2006 symfs = symbol_conf.symfs; 2007 if (strcmp(symfs, "/") == 0) 2008 symbol_conf.symfs = ""; 2009 if (symfs != symbol_conf.symfs) 2010 free((void *)symfs); 2011 2012 symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); 2013 2014 symbol_conf.initialized = true; 2015 return 0; 2016 2017 out_free_tid_list: 2018 intlist__delete(symbol_conf.tid_list); 2019 out_free_pid_list: 2020 intlist__delete(symbol_conf.pid_list); 2021 out_free_comm_list: 2022 strlist__delete(symbol_conf.comm_list); 2023 out_free_dso_list: 2024 strlist__delete(symbol_conf.dso_list); 2025 return -1; 2026 } 2027 2028 void symbol__exit(void) 2029 { 2030 if (!symbol_conf.initialized) 2031 return; 2032 strlist__delete(symbol_conf.sym_list); 2033 strlist__delete(symbol_conf.dso_list); 2034 strlist__delete(symbol_conf.comm_list); 2035 intlist__delete(symbol_conf.tid_list); 2036 intlist__delete(symbol_conf.pid_list); 2037 vmlinux_path__exit(); 2038 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; 2039 symbol_conf.initialized = false; 2040 } 2041