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 19 #include <elf.h> 20 #include <limits.h> 21 #include <sys/utsname.h> 22 23 #ifndef KSYM_NAME_LEN 24 #define KSYM_NAME_LEN 256 25 #endif 26 27 static int dso__load_kernel_sym(struct dso *dso, struct map *map, 28 symbol_filter_t filter); 29 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, 30 symbol_filter_t filter); 31 static int vmlinux_path__nr_entries; 32 static char **vmlinux_path; 33 34 struct symbol_conf symbol_conf = { 35 .exclude_other = true, 36 .use_modules = true, 37 .try_vmlinux_path = true, 38 .annotate_src = true, 39 .symfs = "", 40 }; 41 42 static enum dso_binary_type binary_type_symtab[] = { 43 DSO_BINARY_TYPE__KALLSYMS, 44 DSO_BINARY_TYPE__GUEST_KALLSYMS, 45 DSO_BINARY_TYPE__JAVA_JIT, 46 DSO_BINARY_TYPE__DEBUGLINK, 47 DSO_BINARY_TYPE__BUILD_ID_CACHE, 48 DSO_BINARY_TYPE__FEDORA_DEBUGINFO, 49 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, 50 DSO_BINARY_TYPE__BUILDID_DEBUGINFO, 51 DSO_BINARY_TYPE__SYSTEM_PATH_DSO, 52 DSO_BINARY_TYPE__GUEST_KMODULE, 53 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, 54 DSO_BINARY_TYPE__NOT_FOUND, 55 }; 56 57 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) 58 59 bool symbol_type__is_a(char symbol_type, enum map_type map_type) 60 { 61 symbol_type = toupper(symbol_type); 62 63 switch (map_type) { 64 case MAP__FUNCTION: 65 return symbol_type == 'T' || symbol_type == 'W'; 66 case MAP__VARIABLE: 67 return symbol_type == 'D'; 68 default: 69 return false; 70 } 71 } 72 73 static int prefix_underscores_count(const char *str) 74 { 75 const char *tail = str; 76 77 while (*tail == '_') 78 tail++; 79 80 return tail - str; 81 } 82 83 #define SYMBOL_A 0 84 #define SYMBOL_B 1 85 86 static int choose_best_symbol(struct symbol *syma, struct symbol *symb) 87 { 88 s64 a; 89 s64 b; 90 91 /* Prefer a symbol with non zero length */ 92 a = syma->end - syma->start; 93 b = symb->end - symb->start; 94 if ((b == 0) && (a > 0)) 95 return SYMBOL_A; 96 else if ((a == 0) && (b > 0)) 97 return SYMBOL_B; 98 99 /* Prefer a non weak symbol over a weak one */ 100 a = syma->binding == STB_WEAK; 101 b = symb->binding == STB_WEAK; 102 if (b && !a) 103 return SYMBOL_A; 104 if (a && !b) 105 return SYMBOL_B; 106 107 /* Prefer a global symbol over a non global one */ 108 a = syma->binding == STB_GLOBAL; 109 b = symb->binding == STB_GLOBAL; 110 if (a && !b) 111 return SYMBOL_A; 112 if (b && !a) 113 return SYMBOL_B; 114 115 /* Prefer a symbol with less underscores */ 116 a = prefix_underscores_count(syma->name); 117 b = prefix_underscores_count(symb->name); 118 if (b > a) 119 return SYMBOL_A; 120 else if (a > b) 121 return SYMBOL_B; 122 123 /* If all else fails, choose the symbol with the longest name */ 124 if (strlen(syma->name) >= strlen(symb->name)) 125 return SYMBOL_A; 126 else 127 return SYMBOL_B; 128 } 129 130 void symbols__fixup_duplicate(struct rb_root *symbols) 131 { 132 struct rb_node *nd; 133 struct symbol *curr, *next; 134 135 nd = rb_first(symbols); 136 137 while (nd) { 138 curr = rb_entry(nd, struct symbol, rb_node); 139 again: 140 nd = rb_next(&curr->rb_node); 141 next = rb_entry(nd, struct symbol, rb_node); 142 143 if (!nd) 144 break; 145 146 if (curr->start != next->start) 147 continue; 148 149 if (choose_best_symbol(curr, next) == SYMBOL_A) { 150 rb_erase(&next->rb_node, symbols); 151 goto again; 152 } else { 153 nd = rb_next(&curr->rb_node); 154 rb_erase(&curr->rb_node, symbols); 155 } 156 } 157 } 158 159 void symbols__fixup_end(struct rb_root *symbols) 160 { 161 struct rb_node *nd, *prevnd = rb_first(symbols); 162 struct symbol *curr, *prev; 163 164 if (prevnd == NULL) 165 return; 166 167 curr = rb_entry(prevnd, struct symbol, rb_node); 168 169 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 170 prev = curr; 171 curr = rb_entry(nd, struct symbol, rb_node); 172 173 if (prev->end == prev->start && prev->end != curr->start) 174 prev->end = curr->start - 1; 175 } 176 177 /* Last entry */ 178 if (curr->end == curr->start) 179 curr->end = roundup(curr->start, 4096); 180 } 181 182 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) 183 { 184 struct map *prev, *curr; 185 struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]); 186 187 if (prevnd == NULL) 188 return; 189 190 curr = rb_entry(prevnd, struct map, rb_node); 191 192 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 193 prev = curr; 194 curr = rb_entry(nd, struct map, rb_node); 195 prev->end = curr->start - 1; 196 } 197 198 /* 199 * We still haven't the actual symbols, so guess the 200 * last map final address. 201 */ 202 curr->end = ~0ULL; 203 } 204 205 static void map_groups__fixup_end(struct map_groups *mg) 206 { 207 int i; 208 for (i = 0; i < MAP__NR_TYPES; ++i) 209 __map_groups__fixup_end(mg, i); 210 } 211 212 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name) 213 { 214 size_t namelen = strlen(name) + 1; 215 struct symbol *sym = calloc(1, (symbol_conf.priv_size + 216 sizeof(*sym) + namelen)); 217 if (sym == NULL) 218 return NULL; 219 220 if (symbol_conf.priv_size) 221 sym = ((void *)sym) + symbol_conf.priv_size; 222 223 sym->start = start; 224 sym->end = len ? start + len - 1 : start; 225 sym->binding = binding; 226 sym->namelen = namelen - 1; 227 228 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", 229 __func__, name, start, sym->end); 230 memcpy(sym->name, name, namelen); 231 232 return sym; 233 } 234 235 void symbol__delete(struct symbol *sym) 236 { 237 free(((void *)sym) - symbol_conf.priv_size); 238 } 239 240 size_t symbol__fprintf(struct symbol *sym, FILE *fp) 241 { 242 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n", 243 sym->start, sym->end, 244 sym->binding == STB_GLOBAL ? 'g' : 245 sym->binding == STB_LOCAL ? 'l' : 'w', 246 sym->name); 247 } 248 249 size_t symbol__fprintf_symname_offs(const struct symbol *sym, 250 const struct addr_location *al, FILE *fp) 251 { 252 unsigned long offset; 253 size_t length; 254 255 if (sym && sym->name) { 256 length = fprintf(fp, "%s", sym->name); 257 if (al) { 258 offset = al->addr - sym->start; 259 length += fprintf(fp, "+0x%lx", offset); 260 } 261 return length; 262 } else 263 return fprintf(fp, "[unknown]"); 264 } 265 266 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp) 267 { 268 return symbol__fprintf_symname_offs(sym, NULL, fp); 269 } 270 271 void symbols__delete(struct rb_root *symbols) 272 { 273 struct symbol *pos; 274 struct rb_node *next = rb_first(symbols); 275 276 while (next) { 277 pos = rb_entry(next, struct symbol, rb_node); 278 next = rb_next(&pos->rb_node); 279 rb_erase(&pos->rb_node, symbols); 280 symbol__delete(pos); 281 } 282 } 283 284 void symbols__insert(struct rb_root *symbols, struct symbol *sym) 285 { 286 struct rb_node **p = &symbols->rb_node; 287 struct rb_node *parent = NULL; 288 const u64 ip = sym->start; 289 struct symbol *s; 290 291 while (*p != NULL) { 292 parent = *p; 293 s = rb_entry(parent, struct symbol, rb_node); 294 if (ip < s->start) 295 p = &(*p)->rb_left; 296 else 297 p = &(*p)->rb_right; 298 } 299 rb_link_node(&sym->rb_node, parent, p); 300 rb_insert_color(&sym->rb_node, symbols); 301 } 302 303 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip) 304 { 305 struct rb_node *n; 306 307 if (symbols == NULL) 308 return NULL; 309 310 n = symbols->rb_node; 311 312 while (n) { 313 struct symbol *s = rb_entry(n, struct symbol, rb_node); 314 315 if (ip < s->start) 316 n = n->rb_left; 317 else if (ip > s->end) 318 n = n->rb_right; 319 else 320 return s; 321 } 322 323 return NULL; 324 } 325 326 struct symbol_name_rb_node { 327 struct rb_node rb_node; 328 struct symbol sym; 329 }; 330 331 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym) 332 { 333 struct rb_node **p = &symbols->rb_node; 334 struct rb_node *parent = NULL; 335 struct symbol_name_rb_node *symn, *s; 336 337 symn = container_of(sym, struct symbol_name_rb_node, sym); 338 339 while (*p != NULL) { 340 parent = *p; 341 s = rb_entry(parent, struct symbol_name_rb_node, rb_node); 342 if (strcmp(sym->name, s->sym.name) < 0) 343 p = &(*p)->rb_left; 344 else 345 p = &(*p)->rb_right; 346 } 347 rb_link_node(&symn->rb_node, parent, p); 348 rb_insert_color(&symn->rb_node, symbols); 349 } 350 351 static void symbols__sort_by_name(struct rb_root *symbols, 352 struct rb_root *source) 353 { 354 struct rb_node *nd; 355 356 for (nd = rb_first(source); nd; nd = rb_next(nd)) { 357 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 358 symbols__insert_by_name(symbols, pos); 359 } 360 } 361 362 static struct symbol *symbols__find_by_name(struct rb_root *symbols, 363 const char *name) 364 { 365 struct rb_node *n; 366 367 if (symbols == NULL) 368 return NULL; 369 370 n = symbols->rb_node; 371 372 while (n) { 373 struct symbol_name_rb_node *s; 374 int cmp; 375 376 s = rb_entry(n, struct symbol_name_rb_node, rb_node); 377 cmp = strcmp(name, s->sym.name); 378 379 if (cmp < 0) 380 n = n->rb_left; 381 else if (cmp > 0) 382 n = n->rb_right; 383 else 384 return &s->sym; 385 } 386 387 return NULL; 388 } 389 390 struct symbol *dso__find_symbol(struct dso *dso, 391 enum map_type type, u64 addr) 392 { 393 return symbols__find(&dso->symbols[type], addr); 394 } 395 396 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type, 397 const char *name) 398 { 399 return symbols__find_by_name(&dso->symbol_names[type], name); 400 } 401 402 void dso__sort_by_name(struct dso *dso, enum map_type type) 403 { 404 dso__set_sorted_by_name(dso, type); 405 return symbols__sort_by_name(&dso->symbol_names[type], 406 &dso->symbols[type]); 407 } 408 409 size_t dso__fprintf_symbols_by_name(struct dso *dso, 410 enum map_type type, FILE *fp) 411 { 412 size_t ret = 0; 413 struct rb_node *nd; 414 struct symbol_name_rb_node *pos; 415 416 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) { 417 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 418 fprintf(fp, "%s\n", pos->sym.name); 419 } 420 421 return ret; 422 } 423 424 int kallsyms__parse(const char *filename, void *arg, 425 int (*process_symbol)(void *arg, const char *name, 426 char type, u64 start)) 427 { 428 char *line = NULL; 429 size_t n; 430 int err = -1; 431 FILE *file = fopen(filename, "r"); 432 433 if (file == NULL) 434 goto out_failure; 435 436 err = 0; 437 438 while (!feof(file)) { 439 u64 start; 440 int line_len, len; 441 char symbol_type; 442 char *symbol_name; 443 444 line_len = getline(&line, &n, file); 445 if (line_len < 0 || !line) 446 break; 447 448 line[--line_len] = '\0'; /* \n */ 449 450 len = hex2u64(line, &start); 451 452 len++; 453 if (len + 2 >= line_len) 454 continue; 455 456 symbol_type = line[len]; 457 len += 2; 458 symbol_name = line + len; 459 len = line_len - len; 460 461 if (len >= KSYM_NAME_LEN) { 462 err = -1; 463 break; 464 } 465 466 err = process_symbol(arg, symbol_name, 467 symbol_type, start); 468 if (err) 469 break; 470 } 471 472 free(line); 473 fclose(file); 474 return err; 475 476 out_failure: 477 return -1; 478 } 479 480 struct process_kallsyms_args { 481 struct map *map; 482 struct dso *dso; 483 }; 484 485 static u8 kallsyms2elf_type(char type) 486 { 487 if (type == 'W') 488 return STB_WEAK; 489 490 return isupper(type) ? STB_GLOBAL : STB_LOCAL; 491 } 492 493 static int map__process_kallsym_symbol(void *arg, const char *name, 494 char type, u64 start) 495 { 496 struct symbol *sym; 497 struct process_kallsyms_args *a = arg; 498 struct rb_root *root = &a->dso->symbols[a->map->type]; 499 500 if (!symbol_type__is_a(type, a->map->type)) 501 return 0; 502 503 /* 504 * module symbols are not sorted so we add all 505 * symbols, setting length to 0, and rely on 506 * symbols__fixup_end() to fix it up. 507 */ 508 sym = symbol__new(start, 0, kallsyms2elf_type(type), name); 509 if (sym == NULL) 510 return -ENOMEM; 511 /* 512 * We will pass the symbols to the filter later, in 513 * map__split_kallsyms, when we have split the maps per module 514 */ 515 symbols__insert(root, sym); 516 517 return 0; 518 } 519 520 /* 521 * Loads the function entries in /proc/kallsyms into kernel_map->dso, 522 * so that we can in the next step set the symbol ->end address and then 523 * call kernel_maps__split_kallsyms. 524 */ 525 static int dso__load_all_kallsyms(struct dso *dso, const char *filename, 526 struct map *map) 527 { 528 struct process_kallsyms_args args = { .map = map, .dso = dso, }; 529 return kallsyms__parse(filename, &args, map__process_kallsym_symbol); 530 } 531 532 /* 533 * Split the symbols into maps, making sure there are no overlaps, i.e. the 534 * kernel range is broken in several maps, named [kernel].N, as we don't have 535 * the original ELF section names vmlinux have. 536 */ 537 static int dso__split_kallsyms(struct dso *dso, struct map *map, 538 symbol_filter_t filter) 539 { 540 struct map_groups *kmaps = map__kmap(map)->kmaps; 541 struct machine *machine = kmaps->machine; 542 struct map *curr_map = map; 543 struct symbol *pos; 544 int count = 0, moved = 0; 545 struct rb_root *root = &dso->symbols[map->type]; 546 struct rb_node *next = rb_first(root); 547 int kernel_range = 0; 548 549 while (next) { 550 char *module; 551 552 pos = rb_entry(next, struct symbol, rb_node); 553 next = rb_next(&pos->rb_node); 554 555 module = strchr(pos->name, '\t'); 556 if (module) { 557 if (!symbol_conf.use_modules) 558 goto discard_symbol; 559 560 *module++ = '\0'; 561 562 if (strcmp(curr_map->dso->short_name, module)) { 563 if (curr_map != map && 564 dso->kernel == DSO_TYPE_GUEST_KERNEL && 565 machine__is_default_guest(machine)) { 566 /* 567 * We assume all symbols of a module are 568 * continuous in * kallsyms, so curr_map 569 * points to a module and all its 570 * symbols are in its kmap. Mark it as 571 * loaded. 572 */ 573 dso__set_loaded(curr_map->dso, 574 curr_map->type); 575 } 576 577 curr_map = map_groups__find_by_name(kmaps, 578 map->type, module); 579 if (curr_map == NULL) { 580 pr_debug("%s/proc/{kallsyms,modules} " 581 "inconsistency while looking " 582 "for \"%s\" module!\n", 583 machine->root_dir, module); 584 curr_map = map; 585 goto discard_symbol; 586 } 587 588 if (curr_map->dso->loaded && 589 !machine__is_default_guest(machine)) 590 goto discard_symbol; 591 } 592 /* 593 * So that we look just like we get from .ko files, 594 * i.e. not prelinked, relative to map->start. 595 */ 596 pos->start = curr_map->map_ip(curr_map, pos->start); 597 pos->end = curr_map->map_ip(curr_map, pos->end); 598 } else if (curr_map != map) { 599 char dso_name[PATH_MAX]; 600 struct dso *ndso; 601 602 if (count == 0) { 603 curr_map = map; 604 goto filter_symbol; 605 } 606 607 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 608 snprintf(dso_name, sizeof(dso_name), 609 "[guest.kernel].%d", 610 kernel_range++); 611 else 612 snprintf(dso_name, sizeof(dso_name), 613 "[kernel].%d", 614 kernel_range++); 615 616 ndso = dso__new(dso_name); 617 if (ndso == NULL) 618 return -1; 619 620 ndso->kernel = dso->kernel; 621 622 curr_map = map__new2(pos->start, ndso, map->type); 623 if (curr_map == NULL) { 624 dso__delete(ndso); 625 return -1; 626 } 627 628 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; 629 map_groups__insert(kmaps, curr_map); 630 ++kernel_range; 631 } 632 filter_symbol: 633 if (filter && filter(curr_map, pos)) { 634 discard_symbol: rb_erase(&pos->rb_node, root); 635 symbol__delete(pos); 636 } else { 637 if (curr_map != map) { 638 rb_erase(&pos->rb_node, root); 639 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); 640 ++moved; 641 } else 642 ++count; 643 } 644 } 645 646 if (curr_map != map && 647 dso->kernel == DSO_TYPE_GUEST_KERNEL && 648 machine__is_default_guest(kmaps->machine)) { 649 dso__set_loaded(curr_map->dso, curr_map->type); 650 } 651 652 return count + moved; 653 } 654 655 static bool symbol__restricted_filename(const char *filename, 656 const char *restricted_filename) 657 { 658 bool restricted = false; 659 660 if (symbol_conf.kptr_restrict) { 661 char *r = realpath(filename, NULL); 662 663 if (r != NULL) { 664 restricted = strcmp(r, restricted_filename) == 0; 665 free(r); 666 return restricted; 667 } 668 } 669 670 return restricted; 671 } 672 673 int dso__load_kallsyms(struct dso *dso, const char *filename, 674 struct map *map, symbol_filter_t filter) 675 { 676 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 677 return -1; 678 679 if (dso__load_all_kallsyms(dso, filename, map) < 0) 680 return -1; 681 682 symbols__fixup_duplicate(&dso->symbols[map->type]); 683 symbols__fixup_end(&dso->symbols[map->type]); 684 685 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 686 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 687 else 688 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; 689 690 return dso__split_kallsyms(dso, map, filter); 691 } 692 693 static int dso__load_perf_map(struct dso *dso, struct map *map, 694 symbol_filter_t filter) 695 { 696 char *line = NULL; 697 size_t n; 698 FILE *file; 699 int nr_syms = 0; 700 701 file = fopen(dso->long_name, "r"); 702 if (file == NULL) 703 goto out_failure; 704 705 while (!feof(file)) { 706 u64 start, size; 707 struct symbol *sym; 708 int line_len, len; 709 710 line_len = getline(&line, &n, file); 711 if (line_len < 0) 712 break; 713 714 if (!line) 715 goto out_failure; 716 717 line[--line_len] = '\0'; /* \n */ 718 719 len = hex2u64(line, &start); 720 721 len++; 722 if (len + 2 >= line_len) 723 continue; 724 725 len += hex2u64(line + len, &size); 726 727 len++; 728 if (len + 2 >= line_len) 729 continue; 730 731 sym = symbol__new(start, size, STB_GLOBAL, line + len); 732 733 if (sym == NULL) 734 goto out_delete_line; 735 736 if (filter && filter(map, sym)) 737 symbol__delete(sym); 738 else { 739 symbols__insert(&dso->symbols[map->type], sym); 740 nr_syms++; 741 } 742 } 743 744 free(line); 745 fclose(file); 746 747 return nr_syms; 748 749 out_delete_line: 750 free(line); 751 out_failure: 752 return -1; 753 } 754 755 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) 756 { 757 char *name; 758 int ret = -1; 759 u_int i; 760 struct machine *machine; 761 char *root_dir = (char *) ""; 762 int ss_pos = 0; 763 struct symsrc ss_[2]; 764 struct symsrc *syms_ss = NULL, *runtime_ss = NULL; 765 766 dso__set_loaded(dso, map->type); 767 768 if (dso->kernel == DSO_TYPE_KERNEL) 769 return dso__load_kernel_sym(dso, map, filter); 770 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 771 return dso__load_guest_kernel_sym(dso, map, filter); 772 773 if (map->groups && map->groups->machine) 774 machine = map->groups->machine; 775 else 776 machine = NULL; 777 778 name = malloc(PATH_MAX); 779 if (!name) 780 return -1; 781 782 dso->adjust_symbols = 0; 783 784 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) { 785 struct stat st; 786 787 if (lstat(dso->name, &st) < 0) 788 return -1; 789 790 if (st.st_uid && (st.st_uid != geteuid())) { 791 pr_warning("File %s not owned by current user or root, " 792 "ignoring it.\n", dso->name); 793 return -1; 794 } 795 796 ret = dso__load_perf_map(dso, map, filter); 797 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : 798 DSO_BINARY_TYPE__NOT_FOUND; 799 return ret; 800 } 801 802 if (machine) 803 root_dir = machine->root_dir; 804 805 /* Iterate over candidate debug images. 806 * Keep track of "interesting" ones (those which have a symtab, dynsym, 807 * and/or opd section) for processing. 808 */ 809 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { 810 struct symsrc *ss = &ss_[ss_pos]; 811 bool next_slot = false; 812 813 enum dso_binary_type symtab_type = binary_type_symtab[i]; 814 815 if (dso__binary_type_file(dso, symtab_type, 816 root_dir, name, PATH_MAX)) 817 continue; 818 819 /* Name is now the name of the next image to try */ 820 if (symsrc__init(ss, dso, name, symtab_type) < 0) 821 continue; 822 823 if (!syms_ss && symsrc__has_symtab(ss)) { 824 syms_ss = ss; 825 next_slot = true; 826 } 827 828 if (!runtime_ss && symsrc__possibly_runtime(ss)) { 829 runtime_ss = ss; 830 next_slot = true; 831 } 832 833 if (next_slot) { 834 ss_pos++; 835 836 if (syms_ss && runtime_ss) 837 break; 838 } 839 840 } 841 842 if (!runtime_ss && !syms_ss) 843 goto out_free; 844 845 if (runtime_ss && !syms_ss) { 846 syms_ss = runtime_ss; 847 } 848 849 /* We'll have to hope for the best */ 850 if (!runtime_ss && syms_ss) 851 runtime_ss = syms_ss; 852 853 if (syms_ss) 854 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, 0); 855 else 856 ret = -1; 857 858 if (ret > 0) { 859 int nr_plt; 860 861 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter); 862 if (nr_plt > 0) 863 ret += nr_plt; 864 } 865 866 for (; ss_pos > 0; ss_pos--) 867 symsrc__destroy(&ss_[ss_pos - 1]); 868 out_free: 869 free(name); 870 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) 871 return 0; 872 return ret; 873 } 874 875 struct map *map_groups__find_by_name(struct map_groups *mg, 876 enum map_type type, const char *name) 877 { 878 struct rb_node *nd; 879 880 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) { 881 struct map *map = rb_entry(nd, struct map, rb_node); 882 883 if (map->dso && strcmp(map->dso->short_name, name) == 0) 884 return map; 885 } 886 887 return NULL; 888 } 889 890 static int map_groups__set_modules_path_dir(struct map_groups *mg, 891 const char *dir_name) 892 { 893 struct dirent *dent; 894 DIR *dir = opendir(dir_name); 895 int ret = 0; 896 897 if (!dir) { 898 pr_debug("%s: cannot open %s dir\n", __func__, dir_name); 899 return -1; 900 } 901 902 while ((dent = readdir(dir)) != NULL) { 903 char path[PATH_MAX]; 904 struct stat st; 905 906 /*sshfs might return bad dent->d_type, so we have to stat*/ 907 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name); 908 if (stat(path, &st)) 909 continue; 910 911 if (S_ISDIR(st.st_mode)) { 912 if (!strcmp(dent->d_name, ".") || 913 !strcmp(dent->d_name, "..")) 914 continue; 915 916 ret = map_groups__set_modules_path_dir(mg, path); 917 if (ret < 0) 918 goto out; 919 } else { 920 char *dot = strrchr(dent->d_name, '.'), 921 dso_name[PATH_MAX]; 922 struct map *map; 923 char *long_name; 924 925 if (dot == NULL || strcmp(dot, ".ko")) 926 continue; 927 snprintf(dso_name, sizeof(dso_name), "[%.*s]", 928 (int)(dot - dent->d_name), dent->d_name); 929 930 strxfrchar(dso_name, '-', '_'); 931 map = map_groups__find_by_name(mg, MAP__FUNCTION, 932 dso_name); 933 if (map == NULL) 934 continue; 935 936 long_name = strdup(path); 937 if (long_name == NULL) { 938 ret = -1; 939 goto out; 940 } 941 dso__set_long_name(map->dso, long_name); 942 map->dso->lname_alloc = 1; 943 dso__kernel_module_get_build_id(map->dso, ""); 944 } 945 } 946 947 out: 948 closedir(dir); 949 return ret; 950 } 951 952 static char *get_kernel_version(const char *root_dir) 953 { 954 char version[PATH_MAX]; 955 FILE *file; 956 char *name, *tmp; 957 const char *prefix = "Linux version "; 958 959 sprintf(version, "%s/proc/version", root_dir); 960 file = fopen(version, "r"); 961 if (!file) 962 return NULL; 963 964 version[0] = '\0'; 965 tmp = fgets(version, sizeof(version), file); 966 fclose(file); 967 968 name = strstr(version, prefix); 969 if (!name) 970 return NULL; 971 name += strlen(prefix); 972 tmp = strchr(name, ' '); 973 if (tmp) 974 *tmp = '\0'; 975 976 return strdup(name); 977 } 978 979 static int machine__set_modules_path(struct machine *machine) 980 { 981 char *version; 982 char modules_path[PATH_MAX]; 983 984 version = get_kernel_version(machine->root_dir); 985 if (!version) 986 return -1; 987 988 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel", 989 machine->root_dir, version); 990 free(version); 991 992 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path); 993 } 994 995 struct map *machine__new_module(struct machine *machine, u64 start, 996 const char *filename) 997 { 998 struct map *map; 999 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename); 1000 1001 if (dso == NULL) 1002 return NULL; 1003 1004 map = map__new2(start, dso, MAP__FUNCTION); 1005 if (map == NULL) 1006 return NULL; 1007 1008 if (machine__is_host(machine)) 1009 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE; 1010 else 1011 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE; 1012 map_groups__insert(&machine->kmaps, map); 1013 return map; 1014 } 1015 1016 static int machine__create_modules(struct machine *machine) 1017 { 1018 char *line = NULL; 1019 size_t n; 1020 FILE *file; 1021 struct map *map; 1022 const char *modules; 1023 char path[PATH_MAX]; 1024 1025 if (machine__is_default_guest(machine)) 1026 modules = symbol_conf.default_guest_modules; 1027 else { 1028 sprintf(path, "%s/proc/modules", machine->root_dir); 1029 modules = path; 1030 } 1031 1032 if (symbol__restricted_filename(path, "/proc/modules")) 1033 return -1; 1034 1035 file = fopen(modules, "r"); 1036 if (file == NULL) 1037 return -1; 1038 1039 while (!feof(file)) { 1040 char name[PATH_MAX]; 1041 u64 start; 1042 char *sep; 1043 int line_len; 1044 1045 line_len = getline(&line, &n, file); 1046 if (line_len < 0) 1047 break; 1048 1049 if (!line) 1050 goto out_failure; 1051 1052 line[--line_len] = '\0'; /* \n */ 1053 1054 sep = strrchr(line, 'x'); 1055 if (sep == NULL) 1056 continue; 1057 1058 hex2u64(sep + 1, &start); 1059 1060 sep = strchr(line, ' '); 1061 if (sep == NULL) 1062 continue; 1063 1064 *sep = '\0'; 1065 1066 snprintf(name, sizeof(name), "[%s]", line); 1067 map = machine__new_module(machine, start, name); 1068 if (map == NULL) 1069 goto out_delete_line; 1070 dso__kernel_module_get_build_id(map->dso, machine->root_dir); 1071 } 1072 1073 free(line); 1074 fclose(file); 1075 1076 return machine__set_modules_path(machine); 1077 1078 out_delete_line: 1079 free(line); 1080 out_failure: 1081 return -1; 1082 } 1083 1084 int dso__load_vmlinux(struct dso *dso, struct map *map, 1085 const char *vmlinux, symbol_filter_t filter) 1086 { 1087 int err = -1; 1088 struct symsrc ss; 1089 char symfs_vmlinux[PATH_MAX]; 1090 enum dso_binary_type symtab_type; 1091 1092 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s", 1093 symbol_conf.symfs, vmlinux); 1094 1095 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1096 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1097 else 1098 symtab_type = DSO_BINARY_TYPE__VMLINUX; 1099 1100 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) 1101 return -1; 1102 1103 err = dso__load_sym(dso, map, &ss, &ss, filter, 0); 1104 symsrc__destroy(&ss); 1105 1106 if (err > 0) { 1107 dso__set_long_name(dso, (char *)vmlinux); 1108 dso__set_loaded(dso, map->type); 1109 pr_debug("Using %s for symbols\n", symfs_vmlinux); 1110 } 1111 1112 return err; 1113 } 1114 1115 int dso__load_vmlinux_path(struct dso *dso, struct map *map, 1116 symbol_filter_t filter) 1117 { 1118 int i, err = 0; 1119 char *filename; 1120 1121 pr_debug("Looking at the vmlinux_path (%d entries long)\n", 1122 vmlinux_path__nr_entries + 1); 1123 1124 filename = dso__build_id_filename(dso, NULL, 0); 1125 if (filename != NULL) { 1126 err = dso__load_vmlinux(dso, map, filename, filter); 1127 if (err > 0) 1128 goto out; 1129 free(filename); 1130 } 1131 1132 for (i = 0; i < vmlinux_path__nr_entries; ++i) { 1133 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter); 1134 if (err > 0) { 1135 dso__set_long_name(dso, strdup(vmlinux_path[i])); 1136 break; 1137 } 1138 } 1139 out: 1140 return err; 1141 } 1142 1143 static int dso__load_kernel_sym(struct dso *dso, struct map *map, 1144 symbol_filter_t filter) 1145 { 1146 int err; 1147 const char *kallsyms_filename = NULL; 1148 char *kallsyms_allocated_filename = NULL; 1149 /* 1150 * Step 1: if the user specified a kallsyms or vmlinux filename, use 1151 * it and only it, reporting errors to the user if it cannot be used. 1152 * 1153 * For instance, try to analyse an ARM perf.data file _without_ a 1154 * build-id, or if the user specifies the wrong path to the right 1155 * vmlinux file, obviously we can't fallback to another vmlinux (a 1156 * x86_86 one, on the machine where analysis is being performed, say), 1157 * or worse, /proc/kallsyms. 1158 * 1159 * If the specified file _has_ a build-id and there is a build-id 1160 * section in the perf.data file, we will still do the expected 1161 * validation in dso__load_vmlinux and will bail out if they don't 1162 * match. 1163 */ 1164 if (symbol_conf.kallsyms_name != NULL) { 1165 kallsyms_filename = symbol_conf.kallsyms_name; 1166 goto do_kallsyms; 1167 } 1168 1169 if (symbol_conf.vmlinux_name != NULL) { 1170 err = dso__load_vmlinux(dso, map, 1171 symbol_conf.vmlinux_name, filter); 1172 if (err > 0) { 1173 dso__set_long_name(dso, 1174 strdup(symbol_conf.vmlinux_name)); 1175 goto out_fixup; 1176 } 1177 return err; 1178 } 1179 1180 if (vmlinux_path != NULL) { 1181 err = dso__load_vmlinux_path(dso, map, filter); 1182 if (err > 0) 1183 goto out_fixup; 1184 } 1185 1186 /* do not try local files if a symfs was given */ 1187 if (symbol_conf.symfs[0] != 0) 1188 return -1; 1189 1190 /* 1191 * Say the kernel DSO was created when processing the build-id header table, 1192 * we have a build-id, so check if it is the same as the running kernel, 1193 * using it if it is. 1194 */ 1195 if (dso->has_build_id) { 1196 u8 kallsyms_build_id[BUILD_ID_SIZE]; 1197 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 1198 1199 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id, 1200 sizeof(kallsyms_build_id)) == 0) { 1201 if (dso__build_id_equal(dso, kallsyms_build_id)) { 1202 kallsyms_filename = "/proc/kallsyms"; 1203 goto do_kallsyms; 1204 } 1205 } 1206 /* 1207 * Now look if we have it on the build-id cache in 1208 * $HOME/.debug/[kernel.kallsyms]. 1209 */ 1210 build_id__sprintf(dso->build_id, sizeof(dso->build_id), 1211 sbuild_id); 1212 1213 if (asprintf(&kallsyms_allocated_filename, 1214 "%s/.debug/[kernel.kallsyms]/%s", 1215 getenv("HOME"), sbuild_id) == -1) { 1216 pr_err("Not enough memory for kallsyms file lookup\n"); 1217 return -1; 1218 } 1219 1220 kallsyms_filename = kallsyms_allocated_filename; 1221 1222 if (access(kallsyms_filename, F_OK)) { 1223 pr_err("No kallsyms or vmlinux with build-id %s " 1224 "was found\n", sbuild_id); 1225 free(kallsyms_allocated_filename); 1226 return -1; 1227 } 1228 } else { 1229 /* 1230 * Last resort, if we don't have a build-id and couldn't find 1231 * any vmlinux file, try the running kernel kallsyms table. 1232 */ 1233 kallsyms_filename = "/proc/kallsyms"; 1234 } 1235 1236 do_kallsyms: 1237 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1238 if (err > 0) 1239 pr_debug("Using %s for symbols\n", kallsyms_filename); 1240 free(kallsyms_allocated_filename); 1241 1242 if (err > 0) { 1243 dso__set_long_name(dso, strdup("[kernel.kallsyms]")); 1244 out_fixup: 1245 map__fixup_start(map); 1246 map__fixup_end(map); 1247 } 1248 1249 return err; 1250 } 1251 1252 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, 1253 symbol_filter_t filter) 1254 { 1255 int err; 1256 const char *kallsyms_filename = NULL; 1257 struct machine *machine; 1258 char path[PATH_MAX]; 1259 1260 if (!map->groups) { 1261 pr_debug("Guest kernel map hasn't the point to groups\n"); 1262 return -1; 1263 } 1264 machine = map->groups->machine; 1265 1266 if (machine__is_default_guest(machine)) { 1267 /* 1268 * if the user specified a vmlinux filename, use it and only 1269 * it, reporting errors to the user if it cannot be used. 1270 * Or use file guest_kallsyms inputted by user on commandline 1271 */ 1272 if (symbol_conf.default_guest_vmlinux_name != NULL) { 1273 err = dso__load_vmlinux(dso, map, 1274 symbol_conf.default_guest_vmlinux_name, filter); 1275 goto out_try_fixup; 1276 } 1277 1278 kallsyms_filename = symbol_conf.default_guest_kallsyms; 1279 if (!kallsyms_filename) 1280 return -1; 1281 } else { 1282 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 1283 kallsyms_filename = path; 1284 } 1285 1286 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); 1287 if (err > 0) 1288 pr_debug("Using %s for symbols\n", kallsyms_filename); 1289 1290 out_try_fixup: 1291 if (err > 0) { 1292 if (kallsyms_filename != NULL) { 1293 machine__mmap_name(machine, path, sizeof(path)); 1294 dso__set_long_name(dso, strdup(path)); 1295 } 1296 map__fixup_start(map); 1297 map__fixup_end(map); 1298 } 1299 1300 return err; 1301 } 1302 1303 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp) 1304 { 1305 struct rb_node *nd; 1306 size_t ret = 0; 1307 1308 for (nd = rb_first(machines); nd; nd = rb_next(nd)) { 1309 struct machine *pos = rb_entry(nd, struct machine, rb_node); 1310 ret += __dsos__fprintf(&pos->kernel_dsos, fp); 1311 ret += __dsos__fprintf(&pos->user_dsos, fp); 1312 } 1313 1314 return ret; 1315 } 1316 1317 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp, 1318 bool with_hits) 1319 { 1320 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) + 1321 __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits); 1322 } 1323 1324 size_t machines__fprintf_dsos_buildid(struct rb_root *machines, 1325 FILE *fp, bool with_hits) 1326 { 1327 struct rb_node *nd; 1328 size_t ret = 0; 1329 1330 for (nd = rb_first(machines); nd; nd = rb_next(nd)) { 1331 struct machine *pos = rb_entry(nd, struct machine, rb_node); 1332 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits); 1333 } 1334 return ret; 1335 } 1336 1337 static struct dso *machine__get_kernel(struct machine *machine) 1338 { 1339 const char *vmlinux_name = NULL; 1340 struct dso *kernel; 1341 1342 if (machine__is_host(machine)) { 1343 vmlinux_name = symbol_conf.vmlinux_name; 1344 if (!vmlinux_name) 1345 vmlinux_name = "[kernel.kallsyms]"; 1346 1347 kernel = dso__kernel_findnew(machine, vmlinux_name, 1348 "[kernel]", 1349 DSO_TYPE_KERNEL); 1350 } else { 1351 char bf[PATH_MAX]; 1352 1353 if (machine__is_default_guest(machine)) 1354 vmlinux_name = symbol_conf.default_guest_vmlinux_name; 1355 if (!vmlinux_name) 1356 vmlinux_name = machine__mmap_name(machine, bf, 1357 sizeof(bf)); 1358 1359 kernel = dso__kernel_findnew(machine, vmlinux_name, 1360 "[guest.kernel]", 1361 DSO_TYPE_GUEST_KERNEL); 1362 } 1363 1364 if (kernel != NULL && (!kernel->has_build_id)) 1365 dso__read_running_kernel_build_id(kernel, machine); 1366 1367 return kernel; 1368 } 1369 1370 struct process_args { 1371 u64 start; 1372 }; 1373 1374 static int symbol__in_kernel(void *arg, const char *name, 1375 char type __maybe_unused, u64 start) 1376 { 1377 struct process_args *args = arg; 1378 1379 if (strchr(name, '[')) 1380 return 0; 1381 1382 args->start = start; 1383 return 1; 1384 } 1385 1386 /* Figure out the start address of kernel map from /proc/kallsyms */ 1387 static u64 machine__get_kernel_start_addr(struct machine *machine) 1388 { 1389 const char *filename; 1390 char path[PATH_MAX]; 1391 struct process_args args; 1392 1393 if (machine__is_host(machine)) { 1394 filename = "/proc/kallsyms"; 1395 } else { 1396 if (machine__is_default_guest(machine)) 1397 filename = (char *)symbol_conf.default_guest_kallsyms; 1398 else { 1399 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 1400 filename = path; 1401 } 1402 } 1403 1404 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 1405 return 0; 1406 1407 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0) 1408 return 0; 1409 1410 return args.start; 1411 } 1412 1413 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel) 1414 { 1415 enum map_type type; 1416 u64 start = machine__get_kernel_start_addr(machine); 1417 1418 for (type = 0; type < MAP__NR_TYPES; ++type) { 1419 struct kmap *kmap; 1420 1421 machine->vmlinux_maps[type] = map__new2(start, kernel, type); 1422 if (machine->vmlinux_maps[type] == NULL) 1423 return -1; 1424 1425 machine->vmlinux_maps[type]->map_ip = 1426 machine->vmlinux_maps[type]->unmap_ip = 1427 identity__map_ip; 1428 kmap = map__kmap(machine->vmlinux_maps[type]); 1429 kmap->kmaps = &machine->kmaps; 1430 map_groups__insert(&machine->kmaps, 1431 machine->vmlinux_maps[type]); 1432 } 1433 1434 return 0; 1435 } 1436 1437 void machine__destroy_kernel_maps(struct machine *machine) 1438 { 1439 enum map_type type; 1440 1441 for (type = 0; type < MAP__NR_TYPES; ++type) { 1442 struct kmap *kmap; 1443 1444 if (machine->vmlinux_maps[type] == NULL) 1445 continue; 1446 1447 kmap = map__kmap(machine->vmlinux_maps[type]); 1448 map_groups__remove(&machine->kmaps, 1449 machine->vmlinux_maps[type]); 1450 if (kmap->ref_reloc_sym) { 1451 /* 1452 * ref_reloc_sym is shared among all maps, so free just 1453 * on one of them. 1454 */ 1455 if (type == MAP__FUNCTION) { 1456 free((char *)kmap->ref_reloc_sym->name); 1457 kmap->ref_reloc_sym->name = NULL; 1458 free(kmap->ref_reloc_sym); 1459 } 1460 kmap->ref_reloc_sym = NULL; 1461 } 1462 1463 map__delete(machine->vmlinux_maps[type]); 1464 machine->vmlinux_maps[type] = NULL; 1465 } 1466 } 1467 1468 int machine__create_kernel_maps(struct machine *machine) 1469 { 1470 struct dso *kernel = machine__get_kernel(machine); 1471 1472 if (kernel == NULL || 1473 __machine__create_kernel_maps(machine, kernel) < 0) 1474 return -1; 1475 1476 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) { 1477 if (machine__is_host(machine)) 1478 pr_debug("Problems creating module maps, " 1479 "continuing anyway...\n"); 1480 else 1481 pr_debug("Problems creating module maps for guest %d, " 1482 "continuing anyway...\n", machine->pid); 1483 } 1484 1485 /* 1486 * Now that we have all the maps created, just set the ->end of them: 1487 */ 1488 map_groups__fixup_end(&machine->kmaps); 1489 return 0; 1490 } 1491 1492 static void vmlinux_path__exit(void) 1493 { 1494 while (--vmlinux_path__nr_entries >= 0) { 1495 free(vmlinux_path[vmlinux_path__nr_entries]); 1496 vmlinux_path[vmlinux_path__nr_entries] = NULL; 1497 } 1498 1499 free(vmlinux_path); 1500 vmlinux_path = NULL; 1501 } 1502 1503 static int vmlinux_path__init(void) 1504 { 1505 struct utsname uts; 1506 char bf[PATH_MAX]; 1507 1508 vmlinux_path = malloc(sizeof(char *) * 5); 1509 if (vmlinux_path == NULL) 1510 return -1; 1511 1512 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux"); 1513 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1514 goto out_fail; 1515 ++vmlinux_path__nr_entries; 1516 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux"); 1517 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1518 goto out_fail; 1519 ++vmlinux_path__nr_entries; 1520 1521 /* only try running kernel version if no symfs was given */ 1522 if (symbol_conf.symfs[0] != 0) 1523 return 0; 1524 1525 if (uname(&uts) < 0) 1526 return -1; 1527 1528 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release); 1529 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1530 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1531 goto out_fail; 1532 ++vmlinux_path__nr_entries; 1533 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release); 1534 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1535 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1536 goto out_fail; 1537 ++vmlinux_path__nr_entries; 1538 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux", 1539 uts.release); 1540 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); 1541 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 1542 goto out_fail; 1543 ++vmlinux_path__nr_entries; 1544 1545 return 0; 1546 1547 out_fail: 1548 vmlinux_path__exit(); 1549 return -1; 1550 } 1551 1552 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp) 1553 { 1554 int i; 1555 size_t printed = 0; 1556 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso; 1557 1558 if (kdso->has_build_id) { 1559 char filename[PATH_MAX]; 1560 if (dso__build_id_filename(kdso, filename, sizeof(filename))) 1561 printed += fprintf(fp, "[0] %s\n", filename); 1562 } 1563 1564 for (i = 0; i < vmlinux_path__nr_entries; ++i) 1565 printed += fprintf(fp, "[%d] %s\n", 1566 i + kdso->has_build_id, vmlinux_path[i]); 1567 1568 return printed; 1569 } 1570 1571 static int setup_list(struct strlist **list, const char *list_str, 1572 const char *list_name) 1573 { 1574 if (list_str == NULL) 1575 return 0; 1576 1577 *list = strlist__new(true, list_str); 1578 if (!*list) { 1579 pr_err("problems parsing %s list\n", list_name); 1580 return -1; 1581 } 1582 return 0; 1583 } 1584 1585 static bool symbol__read_kptr_restrict(void) 1586 { 1587 bool value = false; 1588 1589 if (geteuid() != 0) { 1590 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); 1591 if (fp != NULL) { 1592 char line[8]; 1593 1594 if (fgets(line, sizeof(line), fp) != NULL) 1595 value = atoi(line) != 0; 1596 1597 fclose(fp); 1598 } 1599 } 1600 1601 return value; 1602 } 1603 1604 int symbol__init(void) 1605 { 1606 const char *symfs; 1607 1608 if (symbol_conf.initialized) 1609 return 0; 1610 1611 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); 1612 1613 symbol__elf_init(); 1614 1615 if (symbol_conf.sort_by_name) 1616 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - 1617 sizeof(struct symbol)); 1618 1619 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0) 1620 return -1; 1621 1622 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { 1623 pr_err("'.' is the only non valid --field-separator argument\n"); 1624 return -1; 1625 } 1626 1627 if (setup_list(&symbol_conf.dso_list, 1628 symbol_conf.dso_list_str, "dso") < 0) 1629 return -1; 1630 1631 if (setup_list(&symbol_conf.comm_list, 1632 symbol_conf.comm_list_str, "comm") < 0) 1633 goto out_free_dso_list; 1634 1635 if (setup_list(&symbol_conf.sym_list, 1636 symbol_conf.sym_list_str, "symbol") < 0) 1637 goto out_free_comm_list; 1638 1639 /* 1640 * A path to symbols of "/" is identical to "" 1641 * reset here for simplicity. 1642 */ 1643 symfs = realpath(symbol_conf.symfs, NULL); 1644 if (symfs == NULL) 1645 symfs = symbol_conf.symfs; 1646 if (strcmp(symfs, "/") == 0) 1647 symbol_conf.symfs = ""; 1648 if (symfs != symbol_conf.symfs) 1649 free((void *)symfs); 1650 1651 symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); 1652 1653 symbol_conf.initialized = true; 1654 return 0; 1655 1656 out_free_comm_list: 1657 strlist__delete(symbol_conf.comm_list); 1658 out_free_dso_list: 1659 strlist__delete(symbol_conf.dso_list); 1660 return -1; 1661 } 1662 1663 void symbol__exit(void) 1664 { 1665 if (!symbol_conf.initialized) 1666 return; 1667 strlist__delete(symbol_conf.sym_list); 1668 strlist__delete(symbol_conf.dso_list); 1669 strlist__delete(symbol_conf.comm_list); 1670 vmlinux_path__exit(); 1671 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; 1672 symbol_conf.initialized = false; 1673 } 1674 1675 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid) 1676 { 1677 struct machine *machine = machines__findnew(machines, pid); 1678 1679 if (machine == NULL) 1680 return -1; 1681 1682 return machine__create_kernel_maps(machine); 1683 } 1684 1685 int machines__create_guest_kernel_maps(struct rb_root *machines) 1686 { 1687 int ret = 0; 1688 struct dirent **namelist = NULL; 1689 int i, items = 0; 1690 char path[PATH_MAX]; 1691 pid_t pid; 1692 char *endp; 1693 1694 if (symbol_conf.default_guest_vmlinux_name || 1695 symbol_conf.default_guest_modules || 1696 symbol_conf.default_guest_kallsyms) { 1697 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID); 1698 } 1699 1700 if (symbol_conf.guestmount) { 1701 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL); 1702 if (items <= 0) 1703 return -ENOENT; 1704 for (i = 0; i < items; i++) { 1705 if (!isdigit(namelist[i]->d_name[0])) { 1706 /* Filter out . and .. */ 1707 continue; 1708 } 1709 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10); 1710 if ((*endp != '\0') || 1711 (endp == namelist[i]->d_name) || 1712 (errno == ERANGE)) { 1713 pr_debug("invalid directory (%s). Skipping.\n", 1714 namelist[i]->d_name); 1715 continue; 1716 } 1717 sprintf(path, "%s/%s/proc/kallsyms", 1718 symbol_conf.guestmount, 1719 namelist[i]->d_name); 1720 ret = access(path, R_OK); 1721 if (ret) { 1722 pr_debug("Can't access file %s\n", path); 1723 goto failure; 1724 } 1725 machines__create_kernel_maps(machines, pid); 1726 } 1727 failure: 1728 free(namelist); 1729 } 1730 1731 return ret; 1732 } 1733 1734 void machines__destroy_guest_kernel_maps(struct rb_root *machines) 1735 { 1736 struct rb_node *next = rb_first(machines); 1737 1738 while (next) { 1739 struct machine *pos = rb_entry(next, struct machine, rb_node); 1740 1741 next = rb_next(&pos->rb_node); 1742 rb_erase(&pos->rb_node, machines); 1743 machine__delete(pos); 1744 } 1745 } 1746 1747 int machine__load_kallsyms(struct machine *machine, const char *filename, 1748 enum map_type type, symbol_filter_t filter) 1749 { 1750 struct map *map = machine->vmlinux_maps[type]; 1751 int ret = dso__load_kallsyms(map->dso, filename, map, filter); 1752 1753 if (ret > 0) { 1754 dso__set_loaded(map->dso, type); 1755 /* 1756 * Since /proc/kallsyms will have multiple sessions for the 1757 * kernel, with modules between them, fixup the end of all 1758 * sections. 1759 */ 1760 __map_groups__fixup_end(&machine->kmaps, type); 1761 } 1762 1763 return ret; 1764 } 1765 1766 int machine__load_vmlinux_path(struct machine *machine, enum map_type type, 1767 symbol_filter_t filter) 1768 { 1769 struct map *map = machine->vmlinux_maps[type]; 1770 int ret = dso__load_vmlinux_path(map->dso, map, filter); 1771 1772 if (ret > 0) { 1773 dso__set_loaded(map->dso, type); 1774 map__reloc_vmlinux(map); 1775 } 1776 1777 return ret; 1778 } 1779