1 // SPDX-License-Identifier: GPL-2.0 2 #include <dirent.h> 3 #include <errno.h> 4 #include <stdlib.h> 5 #include <stdio.h> 6 #include <string.h> 7 #include <linux/kernel.h> 8 #include <linux/mman.h> 9 #include <linux/time64.h> 10 #include <sys/types.h> 11 #include <sys/stat.h> 12 #include <sys/param.h> 13 #include <fcntl.h> 14 #include <unistd.h> 15 #include <inttypes.h> 16 #include "annotate.h" 17 #include "build-id.h" 18 #include "util.h" 19 #include "debug.h" 20 #include "machine.h" 21 #include "map.h" 22 #include "symbol.h" 23 #include "strlist.h" 24 #include "intlist.h" 25 #include "namespaces.h" 26 #include "header.h" 27 #include "path.h" 28 #include <linux/ctype.h> 29 #include <linux/zalloc.h> 30 31 #include <elf.h> 32 #include <limits.h> 33 #include <symbol/kallsyms.h> 34 #include <sys/utsname.h> 35 36 static int dso__load_kernel_sym(struct dso *dso, struct map *map); 37 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map); 38 static bool symbol__is_idle(const char *name); 39 40 int vmlinux_path__nr_entries; 41 char **vmlinux_path; 42 43 struct symbol_conf symbol_conf = { 44 .nanosecs = false, 45 .use_modules = true, 46 .try_vmlinux_path = true, 47 .demangle = true, 48 .demangle_kernel = false, 49 .cumulate_callchain = true, 50 .time_quantum = 100 * NSEC_PER_MSEC, /* 100ms */ 51 .show_hist_headers = true, 52 .symfs = "", 53 .event_group = true, 54 .inline_name = true, 55 .res_sample = 0, 56 }; 57 58 static enum dso_binary_type binary_type_symtab[] = { 59 DSO_BINARY_TYPE__KALLSYMS, 60 DSO_BINARY_TYPE__GUEST_KALLSYMS, 61 DSO_BINARY_TYPE__JAVA_JIT, 62 DSO_BINARY_TYPE__DEBUGLINK, 63 DSO_BINARY_TYPE__BUILD_ID_CACHE, 64 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO, 65 DSO_BINARY_TYPE__FEDORA_DEBUGINFO, 66 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, 67 DSO_BINARY_TYPE__BUILDID_DEBUGINFO, 68 DSO_BINARY_TYPE__SYSTEM_PATH_DSO, 69 DSO_BINARY_TYPE__GUEST_KMODULE, 70 DSO_BINARY_TYPE__GUEST_KMODULE_COMP, 71 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, 72 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP, 73 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, 74 DSO_BINARY_TYPE__NOT_FOUND, 75 }; 76 77 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) 78 79 static bool symbol_type__filter(char symbol_type) 80 { 81 symbol_type = toupper(symbol_type); 82 return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B'; 83 } 84 85 static int prefix_underscores_count(const char *str) 86 { 87 const char *tail = str; 88 89 while (*tail == '_') 90 tail++; 91 92 return tail - str; 93 } 94 95 const char * __weak arch__normalize_symbol_name(const char *name) 96 { 97 return name; 98 } 99 100 int __weak arch__compare_symbol_names(const char *namea, const char *nameb) 101 { 102 return strcmp(namea, nameb); 103 } 104 105 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb, 106 unsigned int n) 107 { 108 return strncmp(namea, nameb, n); 109 } 110 111 int __weak arch__choose_best_symbol(struct symbol *syma, 112 struct symbol *symb __maybe_unused) 113 { 114 /* Avoid "SyS" kernel syscall aliases */ 115 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3)) 116 return SYMBOL_B; 117 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10)) 118 return SYMBOL_B; 119 120 return SYMBOL_A; 121 } 122 123 static int choose_best_symbol(struct symbol *syma, struct symbol *symb) 124 { 125 s64 a; 126 s64 b; 127 size_t na, nb; 128 129 /* Prefer a symbol with non zero length */ 130 a = syma->end - syma->start; 131 b = symb->end - symb->start; 132 if ((b == 0) && (a > 0)) 133 return SYMBOL_A; 134 else if ((a == 0) && (b > 0)) 135 return SYMBOL_B; 136 137 /* Prefer a non weak symbol over a weak one */ 138 a = syma->binding == STB_WEAK; 139 b = symb->binding == STB_WEAK; 140 if (b && !a) 141 return SYMBOL_A; 142 if (a && !b) 143 return SYMBOL_B; 144 145 /* Prefer a global symbol over a non global one */ 146 a = syma->binding == STB_GLOBAL; 147 b = symb->binding == STB_GLOBAL; 148 if (a && !b) 149 return SYMBOL_A; 150 if (b && !a) 151 return SYMBOL_B; 152 153 /* Prefer a symbol with less underscores */ 154 a = prefix_underscores_count(syma->name); 155 b = prefix_underscores_count(symb->name); 156 if (b > a) 157 return SYMBOL_A; 158 else if (a > b) 159 return SYMBOL_B; 160 161 /* Choose the symbol with the longest name */ 162 na = strlen(syma->name); 163 nb = strlen(symb->name); 164 if (na > nb) 165 return SYMBOL_A; 166 else if (na < nb) 167 return SYMBOL_B; 168 169 return arch__choose_best_symbol(syma, symb); 170 } 171 172 void symbols__fixup_duplicate(struct rb_root_cached *symbols) 173 { 174 struct rb_node *nd; 175 struct symbol *curr, *next; 176 177 if (symbol_conf.allow_aliases) 178 return; 179 180 nd = rb_first_cached(symbols); 181 182 while (nd) { 183 curr = rb_entry(nd, struct symbol, rb_node); 184 again: 185 nd = rb_next(&curr->rb_node); 186 next = rb_entry(nd, struct symbol, rb_node); 187 188 if (!nd) 189 break; 190 191 if (curr->start != next->start) 192 continue; 193 194 if (choose_best_symbol(curr, next) == SYMBOL_A) { 195 rb_erase_cached(&next->rb_node, symbols); 196 symbol__delete(next); 197 goto again; 198 } else { 199 nd = rb_next(&curr->rb_node); 200 rb_erase_cached(&curr->rb_node, symbols); 201 symbol__delete(curr); 202 } 203 } 204 } 205 206 void symbols__fixup_end(struct rb_root_cached *symbols) 207 { 208 struct rb_node *nd, *prevnd = rb_first_cached(symbols); 209 struct symbol *curr, *prev; 210 211 if (prevnd == NULL) 212 return; 213 214 curr = rb_entry(prevnd, struct symbol, rb_node); 215 216 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 217 prev = curr; 218 curr = rb_entry(nd, struct symbol, rb_node); 219 220 if (prev->end == prev->start && prev->end != curr->start) 221 prev->end = curr->start; 222 } 223 224 /* Last entry */ 225 if (curr->end == curr->start) 226 curr->end = roundup(curr->start, 4096) + 4096; 227 } 228 229 void map_groups__fixup_end(struct map_groups *mg) 230 { 231 struct maps *maps = &mg->maps; 232 struct map *next, *curr; 233 234 down_write(&maps->lock); 235 236 curr = maps__first(maps); 237 if (curr == NULL) 238 goto out_unlock; 239 240 for (next = map__next(curr); next; next = map__next(curr)) { 241 if (!curr->end) 242 curr->end = next->start; 243 curr = next; 244 } 245 246 /* 247 * We still haven't the actual symbols, so guess the 248 * last map final address. 249 */ 250 if (!curr->end) 251 curr->end = ~0ULL; 252 253 out_unlock: 254 up_write(&maps->lock); 255 } 256 257 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name) 258 { 259 size_t namelen = strlen(name) + 1; 260 struct symbol *sym = calloc(1, (symbol_conf.priv_size + 261 sizeof(*sym) + namelen)); 262 if (sym == NULL) 263 return NULL; 264 265 if (symbol_conf.priv_size) { 266 if (symbol_conf.init_annotation) { 267 struct annotation *notes = (void *)sym; 268 pthread_mutex_init(¬es->lock, NULL); 269 } 270 sym = ((void *)sym) + symbol_conf.priv_size; 271 } 272 273 sym->start = start; 274 sym->end = len ? start + len : start; 275 sym->type = type; 276 sym->binding = binding; 277 sym->namelen = namelen - 1; 278 279 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", 280 __func__, name, start, sym->end); 281 memcpy(sym->name, name, namelen); 282 283 return sym; 284 } 285 286 void symbol__delete(struct symbol *sym) 287 { 288 free(((void *)sym) - symbol_conf.priv_size); 289 } 290 291 void symbols__delete(struct rb_root_cached *symbols) 292 { 293 struct symbol *pos; 294 struct rb_node *next = rb_first_cached(symbols); 295 296 while (next) { 297 pos = rb_entry(next, struct symbol, rb_node); 298 next = rb_next(&pos->rb_node); 299 rb_erase_cached(&pos->rb_node, symbols); 300 symbol__delete(pos); 301 } 302 } 303 304 void __symbols__insert(struct rb_root_cached *symbols, 305 struct symbol *sym, bool kernel) 306 { 307 struct rb_node **p = &symbols->rb_root.rb_node; 308 struct rb_node *parent = NULL; 309 const u64 ip = sym->start; 310 struct symbol *s; 311 bool leftmost = true; 312 313 if (kernel) { 314 const char *name = sym->name; 315 /* 316 * ppc64 uses function descriptors and appends a '.' to the 317 * start of every instruction address. Remove it. 318 */ 319 if (name[0] == '.') 320 name++; 321 sym->idle = symbol__is_idle(name); 322 } 323 324 while (*p != NULL) { 325 parent = *p; 326 s = rb_entry(parent, struct symbol, rb_node); 327 if (ip < s->start) 328 p = &(*p)->rb_left; 329 else { 330 p = &(*p)->rb_right; 331 leftmost = false; 332 } 333 } 334 rb_link_node(&sym->rb_node, parent, p); 335 rb_insert_color_cached(&sym->rb_node, symbols, leftmost); 336 } 337 338 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym) 339 { 340 __symbols__insert(symbols, sym, false); 341 } 342 343 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip) 344 { 345 struct rb_node *n; 346 347 if (symbols == NULL) 348 return NULL; 349 350 n = symbols->rb_root.rb_node; 351 352 while (n) { 353 struct symbol *s = rb_entry(n, struct symbol, rb_node); 354 355 if (ip < s->start) 356 n = n->rb_left; 357 else if (ip > s->end || (ip == s->end && ip != s->start)) 358 n = n->rb_right; 359 else 360 return s; 361 } 362 363 return NULL; 364 } 365 366 static struct symbol *symbols__first(struct rb_root_cached *symbols) 367 { 368 struct rb_node *n = rb_first_cached(symbols); 369 370 if (n) 371 return rb_entry(n, struct symbol, rb_node); 372 373 return NULL; 374 } 375 376 static struct symbol *symbols__last(struct rb_root_cached *symbols) 377 { 378 struct rb_node *n = rb_last(&symbols->rb_root); 379 380 if (n) 381 return rb_entry(n, struct symbol, rb_node); 382 383 return NULL; 384 } 385 386 static struct symbol *symbols__next(struct symbol *sym) 387 { 388 struct rb_node *n = rb_next(&sym->rb_node); 389 390 if (n) 391 return rb_entry(n, struct symbol, rb_node); 392 393 return NULL; 394 } 395 396 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym) 397 { 398 struct rb_node **p = &symbols->rb_root.rb_node; 399 struct rb_node *parent = NULL; 400 struct symbol_name_rb_node *symn, *s; 401 bool leftmost = true; 402 403 symn = container_of(sym, struct symbol_name_rb_node, sym); 404 405 while (*p != NULL) { 406 parent = *p; 407 s = rb_entry(parent, struct symbol_name_rb_node, rb_node); 408 if (strcmp(sym->name, s->sym.name) < 0) 409 p = &(*p)->rb_left; 410 else { 411 p = &(*p)->rb_right; 412 leftmost = false; 413 } 414 } 415 rb_link_node(&symn->rb_node, parent, p); 416 rb_insert_color_cached(&symn->rb_node, symbols, leftmost); 417 } 418 419 static void symbols__sort_by_name(struct rb_root_cached *symbols, 420 struct rb_root_cached *source) 421 { 422 struct rb_node *nd; 423 424 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) { 425 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 426 symbols__insert_by_name(symbols, pos); 427 } 428 } 429 430 int symbol__match_symbol_name(const char *name, const char *str, 431 enum symbol_tag_include includes) 432 { 433 const char *versioning; 434 435 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY && 436 (versioning = strstr(name, "@@"))) { 437 int len = strlen(str); 438 439 if (len < versioning - name) 440 len = versioning - name; 441 442 return arch__compare_symbol_names_n(name, str, len); 443 } else 444 return arch__compare_symbol_names(name, str); 445 } 446 447 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols, 448 const char *name, 449 enum symbol_tag_include includes) 450 { 451 struct rb_node *n; 452 struct symbol_name_rb_node *s = NULL; 453 454 if (symbols == NULL) 455 return NULL; 456 457 n = symbols->rb_root.rb_node; 458 459 while (n) { 460 int cmp; 461 462 s = rb_entry(n, struct symbol_name_rb_node, rb_node); 463 cmp = symbol__match_symbol_name(s->sym.name, name, includes); 464 465 if (cmp > 0) 466 n = n->rb_left; 467 else if (cmp < 0) 468 n = n->rb_right; 469 else 470 break; 471 } 472 473 if (n == NULL) 474 return NULL; 475 476 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY) 477 /* return first symbol that has same name (if any) */ 478 for (n = rb_prev(n); n; n = rb_prev(n)) { 479 struct symbol_name_rb_node *tmp; 480 481 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node); 482 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name)) 483 break; 484 485 s = tmp; 486 } 487 488 return &s->sym; 489 } 490 491 void dso__reset_find_symbol_cache(struct dso *dso) 492 { 493 dso->last_find_result.addr = 0; 494 dso->last_find_result.symbol = NULL; 495 } 496 497 void dso__insert_symbol(struct dso *dso, struct symbol *sym) 498 { 499 __symbols__insert(&dso->symbols, sym, dso->kernel); 500 501 /* update the symbol cache if necessary */ 502 if (dso->last_find_result.addr >= sym->start && 503 (dso->last_find_result.addr < sym->end || 504 sym->start == sym->end)) { 505 dso->last_find_result.symbol = sym; 506 } 507 } 508 509 struct symbol *dso__find_symbol(struct dso *dso, u64 addr) 510 { 511 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) { 512 dso->last_find_result.addr = addr; 513 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr); 514 } 515 516 return dso->last_find_result.symbol; 517 } 518 519 struct symbol *dso__first_symbol(struct dso *dso) 520 { 521 return symbols__first(&dso->symbols); 522 } 523 524 struct symbol *dso__last_symbol(struct dso *dso) 525 { 526 return symbols__last(&dso->symbols); 527 } 528 529 struct symbol *dso__next_symbol(struct symbol *sym) 530 { 531 return symbols__next(sym); 532 } 533 534 struct symbol *symbol__next_by_name(struct symbol *sym) 535 { 536 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym); 537 struct rb_node *n = rb_next(&s->rb_node); 538 539 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL; 540 } 541 542 /* 543 * Returns first symbol that matched with @name. 544 */ 545 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name) 546 { 547 struct symbol *s = symbols__find_by_name(&dso->symbol_names, name, 548 SYMBOL_TAG_INCLUDE__NONE); 549 if (!s) 550 s = symbols__find_by_name(&dso->symbol_names, name, 551 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY); 552 return s; 553 } 554 555 void dso__sort_by_name(struct dso *dso) 556 { 557 dso__set_sorted_by_name(dso); 558 return symbols__sort_by_name(&dso->symbol_names, &dso->symbols); 559 } 560 561 int modules__parse(const char *filename, void *arg, 562 int (*process_module)(void *arg, const char *name, 563 u64 start, u64 size)) 564 { 565 char *line = NULL; 566 size_t n; 567 FILE *file; 568 int err = 0; 569 570 file = fopen(filename, "r"); 571 if (file == NULL) 572 return -1; 573 574 while (1) { 575 char name[PATH_MAX]; 576 u64 start, size; 577 char *sep, *endptr; 578 ssize_t line_len; 579 580 line_len = getline(&line, &n, file); 581 if (line_len < 0) { 582 if (feof(file)) 583 break; 584 err = -1; 585 goto out; 586 } 587 588 if (!line) { 589 err = -1; 590 goto out; 591 } 592 593 line[--line_len] = '\0'; /* \n */ 594 595 sep = strrchr(line, 'x'); 596 if (sep == NULL) 597 continue; 598 599 hex2u64(sep + 1, &start); 600 601 sep = strchr(line, ' '); 602 if (sep == NULL) 603 continue; 604 605 *sep = '\0'; 606 607 scnprintf(name, sizeof(name), "[%s]", line); 608 609 size = strtoul(sep + 1, &endptr, 0); 610 if (*endptr != ' ' && *endptr != '\t') 611 continue; 612 613 err = process_module(arg, name, start, size); 614 if (err) 615 break; 616 } 617 out: 618 free(line); 619 fclose(file); 620 return err; 621 } 622 623 /* 624 * These are symbols in the kernel image, so make sure that 625 * sym is from a kernel DSO. 626 */ 627 static bool symbol__is_idle(const char *name) 628 { 629 const char * const idle_symbols[] = { 630 "arch_cpu_idle", 631 "cpu_idle", 632 "cpu_startup_entry", 633 "intel_idle", 634 "default_idle", 635 "native_safe_halt", 636 "enter_idle", 637 "exit_idle", 638 "mwait_idle", 639 "mwait_idle_with_hints", 640 "poll_idle", 641 "ppc64_runlatch_off", 642 "pseries_dedicated_idle_sleep", 643 NULL 644 }; 645 int i; 646 647 for (i = 0; idle_symbols[i]; i++) { 648 if (!strcmp(idle_symbols[i], name)) 649 return true; 650 } 651 652 return false; 653 } 654 655 static int map__process_kallsym_symbol(void *arg, const char *name, 656 char type, u64 start) 657 { 658 struct symbol *sym; 659 struct dso *dso = arg; 660 struct rb_root_cached *root = &dso->symbols; 661 662 if (!symbol_type__filter(type)) 663 return 0; 664 665 /* 666 * module symbols are not sorted so we add all 667 * symbols, setting length to 0, and rely on 668 * symbols__fixup_end() to fix it up. 669 */ 670 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name); 671 if (sym == NULL) 672 return -ENOMEM; 673 /* 674 * We will pass the symbols to the filter later, in 675 * map__split_kallsyms, when we have split the maps per module 676 */ 677 __symbols__insert(root, sym, !strchr(name, '[')); 678 679 return 0; 680 } 681 682 /* 683 * Loads the function entries in /proc/kallsyms into kernel_map->dso, 684 * so that we can in the next step set the symbol ->end address and then 685 * call kernel_maps__split_kallsyms. 686 */ 687 static int dso__load_all_kallsyms(struct dso *dso, const char *filename) 688 { 689 return kallsyms__parse(filename, dso, map__process_kallsym_symbol); 690 } 691 692 static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso) 693 { 694 struct map *curr_map; 695 struct symbol *pos; 696 int count = 0; 697 struct rb_root_cached old_root = dso->symbols; 698 struct rb_root_cached *root = &dso->symbols; 699 struct rb_node *next = rb_first_cached(root); 700 701 if (!kmaps) 702 return -1; 703 704 *root = RB_ROOT_CACHED; 705 706 while (next) { 707 char *module; 708 709 pos = rb_entry(next, struct symbol, rb_node); 710 next = rb_next(&pos->rb_node); 711 712 rb_erase_cached(&pos->rb_node, &old_root); 713 RB_CLEAR_NODE(&pos->rb_node); 714 module = strchr(pos->name, '\t'); 715 if (module) 716 *module = '\0'; 717 718 curr_map = map_groups__find(kmaps, pos->start); 719 720 if (!curr_map) { 721 symbol__delete(pos); 722 continue; 723 } 724 725 pos->start -= curr_map->start - curr_map->pgoff; 726 if (pos->end > curr_map->end) 727 pos->end = curr_map->end; 728 if (pos->end) 729 pos->end -= curr_map->start - curr_map->pgoff; 730 symbols__insert(&curr_map->dso->symbols, pos); 731 ++count; 732 } 733 734 /* Symbols have been adjusted */ 735 dso->adjust_symbols = 1; 736 737 return count; 738 } 739 740 /* 741 * Split the symbols into maps, making sure there are no overlaps, i.e. the 742 * kernel range is broken in several maps, named [kernel].N, as we don't have 743 * the original ELF section names vmlinux have. 744 */ 745 static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta, 746 struct map *initial_map) 747 { 748 struct machine *machine; 749 struct map *curr_map = initial_map; 750 struct symbol *pos; 751 int count = 0, moved = 0; 752 struct rb_root_cached *root = &dso->symbols; 753 struct rb_node *next = rb_first_cached(root); 754 int kernel_range = 0; 755 bool x86_64; 756 757 if (!kmaps) 758 return -1; 759 760 machine = kmaps->machine; 761 762 x86_64 = machine__is(machine, "x86_64"); 763 764 while (next) { 765 char *module; 766 767 pos = rb_entry(next, struct symbol, rb_node); 768 next = rb_next(&pos->rb_node); 769 770 module = strchr(pos->name, '\t'); 771 if (module) { 772 if (!symbol_conf.use_modules) 773 goto discard_symbol; 774 775 *module++ = '\0'; 776 777 if (strcmp(curr_map->dso->short_name, module)) { 778 if (curr_map != initial_map && 779 dso->kernel == DSO_TYPE_GUEST_KERNEL && 780 machine__is_default_guest(machine)) { 781 /* 782 * We assume all symbols of a module are 783 * continuous in * kallsyms, so curr_map 784 * points to a module and all its 785 * symbols are in its kmap. Mark it as 786 * loaded. 787 */ 788 dso__set_loaded(curr_map->dso); 789 } 790 791 curr_map = map_groups__find_by_name(kmaps, module); 792 if (curr_map == NULL) { 793 pr_debug("%s/proc/{kallsyms,modules} " 794 "inconsistency while looking " 795 "for \"%s\" module!\n", 796 machine->root_dir, module); 797 curr_map = initial_map; 798 goto discard_symbol; 799 } 800 801 if (curr_map->dso->loaded && 802 !machine__is_default_guest(machine)) 803 goto discard_symbol; 804 } 805 /* 806 * So that we look just like we get from .ko files, 807 * i.e. not prelinked, relative to initial_map->start. 808 */ 809 pos->start = curr_map->map_ip(curr_map, pos->start); 810 pos->end = curr_map->map_ip(curr_map, pos->end); 811 } else if (x86_64 && is_entry_trampoline(pos->name)) { 812 /* 813 * These symbols are not needed anymore since the 814 * trampoline maps refer to the text section and it's 815 * symbols instead. Avoid having to deal with 816 * relocations, and the assumption that the first symbol 817 * is the start of kernel text, by simply removing the 818 * symbols at this point. 819 */ 820 goto discard_symbol; 821 } else if (curr_map != initial_map) { 822 char dso_name[PATH_MAX]; 823 struct dso *ndso; 824 825 if (delta) { 826 /* Kernel was relocated at boot time */ 827 pos->start -= delta; 828 pos->end -= delta; 829 } 830 831 if (count == 0) { 832 curr_map = initial_map; 833 goto add_symbol; 834 } 835 836 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 837 snprintf(dso_name, sizeof(dso_name), 838 "[guest.kernel].%d", 839 kernel_range++); 840 else 841 snprintf(dso_name, sizeof(dso_name), 842 "[kernel].%d", 843 kernel_range++); 844 845 ndso = dso__new(dso_name); 846 if (ndso == NULL) 847 return -1; 848 849 ndso->kernel = dso->kernel; 850 851 curr_map = map__new2(pos->start, ndso); 852 if (curr_map == NULL) { 853 dso__put(ndso); 854 return -1; 855 } 856 857 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; 858 map_groups__insert(kmaps, curr_map); 859 ++kernel_range; 860 } else if (delta) { 861 /* Kernel was relocated at boot time */ 862 pos->start -= delta; 863 pos->end -= delta; 864 } 865 add_symbol: 866 if (curr_map != initial_map) { 867 rb_erase_cached(&pos->rb_node, root); 868 symbols__insert(&curr_map->dso->symbols, pos); 869 ++moved; 870 } else 871 ++count; 872 873 continue; 874 discard_symbol: 875 rb_erase_cached(&pos->rb_node, root); 876 symbol__delete(pos); 877 } 878 879 if (curr_map != initial_map && 880 dso->kernel == DSO_TYPE_GUEST_KERNEL && 881 machine__is_default_guest(kmaps->machine)) { 882 dso__set_loaded(curr_map->dso); 883 } 884 885 return count + moved; 886 } 887 888 bool symbol__restricted_filename(const char *filename, 889 const char *restricted_filename) 890 { 891 bool restricted = false; 892 893 if (symbol_conf.kptr_restrict) { 894 char *r = realpath(filename, NULL); 895 896 if (r != NULL) { 897 restricted = strcmp(r, restricted_filename) == 0; 898 free(r); 899 return restricted; 900 } 901 } 902 903 return restricted; 904 } 905 906 struct module_info { 907 struct rb_node rb_node; 908 char *name; 909 u64 start; 910 }; 911 912 static void add_module(struct module_info *mi, struct rb_root *modules) 913 { 914 struct rb_node **p = &modules->rb_node; 915 struct rb_node *parent = NULL; 916 struct module_info *m; 917 918 while (*p != NULL) { 919 parent = *p; 920 m = rb_entry(parent, struct module_info, rb_node); 921 if (strcmp(mi->name, m->name) < 0) 922 p = &(*p)->rb_left; 923 else 924 p = &(*p)->rb_right; 925 } 926 rb_link_node(&mi->rb_node, parent, p); 927 rb_insert_color(&mi->rb_node, modules); 928 } 929 930 static void delete_modules(struct rb_root *modules) 931 { 932 struct module_info *mi; 933 struct rb_node *next = rb_first(modules); 934 935 while (next) { 936 mi = rb_entry(next, struct module_info, rb_node); 937 next = rb_next(&mi->rb_node); 938 rb_erase(&mi->rb_node, modules); 939 zfree(&mi->name); 940 free(mi); 941 } 942 } 943 944 static struct module_info *find_module(const char *name, 945 struct rb_root *modules) 946 { 947 struct rb_node *n = modules->rb_node; 948 949 while (n) { 950 struct module_info *m; 951 int cmp; 952 953 m = rb_entry(n, struct module_info, rb_node); 954 cmp = strcmp(name, m->name); 955 if (cmp < 0) 956 n = n->rb_left; 957 else if (cmp > 0) 958 n = n->rb_right; 959 else 960 return m; 961 } 962 963 return NULL; 964 } 965 966 static int __read_proc_modules(void *arg, const char *name, u64 start, 967 u64 size __maybe_unused) 968 { 969 struct rb_root *modules = arg; 970 struct module_info *mi; 971 972 mi = zalloc(sizeof(struct module_info)); 973 if (!mi) 974 return -ENOMEM; 975 976 mi->name = strdup(name); 977 mi->start = start; 978 979 if (!mi->name) { 980 free(mi); 981 return -ENOMEM; 982 } 983 984 add_module(mi, modules); 985 986 return 0; 987 } 988 989 static int read_proc_modules(const char *filename, struct rb_root *modules) 990 { 991 if (symbol__restricted_filename(filename, "/proc/modules")) 992 return -1; 993 994 if (modules__parse(filename, modules, __read_proc_modules)) { 995 delete_modules(modules); 996 return -1; 997 } 998 999 return 0; 1000 } 1001 1002 int compare_proc_modules(const char *from, const char *to) 1003 { 1004 struct rb_root from_modules = RB_ROOT; 1005 struct rb_root to_modules = RB_ROOT; 1006 struct rb_node *from_node, *to_node; 1007 struct module_info *from_m, *to_m; 1008 int ret = -1; 1009 1010 if (read_proc_modules(from, &from_modules)) 1011 return -1; 1012 1013 if (read_proc_modules(to, &to_modules)) 1014 goto out_delete_from; 1015 1016 from_node = rb_first(&from_modules); 1017 to_node = rb_first(&to_modules); 1018 while (from_node) { 1019 if (!to_node) 1020 break; 1021 1022 from_m = rb_entry(from_node, struct module_info, rb_node); 1023 to_m = rb_entry(to_node, struct module_info, rb_node); 1024 1025 if (from_m->start != to_m->start || 1026 strcmp(from_m->name, to_m->name)) 1027 break; 1028 1029 from_node = rb_next(from_node); 1030 to_node = rb_next(to_node); 1031 } 1032 1033 if (!from_node && !to_node) 1034 ret = 0; 1035 1036 delete_modules(&to_modules); 1037 out_delete_from: 1038 delete_modules(&from_modules); 1039 1040 return ret; 1041 } 1042 1043 struct map *map_groups__first(struct map_groups *mg) 1044 { 1045 return maps__first(&mg->maps); 1046 } 1047 1048 static int do_validate_kcore_modules(const char *filename, 1049 struct map_groups *kmaps) 1050 { 1051 struct rb_root modules = RB_ROOT; 1052 struct map *old_map; 1053 int err; 1054 1055 err = read_proc_modules(filename, &modules); 1056 if (err) 1057 return err; 1058 1059 old_map = map_groups__first(kmaps); 1060 while (old_map) { 1061 struct map *next = map_groups__next(old_map); 1062 struct module_info *mi; 1063 1064 if (!__map__is_kmodule(old_map)) { 1065 old_map = next; 1066 continue; 1067 } 1068 1069 /* Module must be in memory at the same address */ 1070 mi = find_module(old_map->dso->short_name, &modules); 1071 if (!mi || mi->start != old_map->start) { 1072 err = -EINVAL; 1073 goto out; 1074 } 1075 1076 old_map = next; 1077 } 1078 out: 1079 delete_modules(&modules); 1080 return err; 1081 } 1082 1083 /* 1084 * If kallsyms is referenced by name then we look for filename in the same 1085 * directory. 1086 */ 1087 static bool filename_from_kallsyms_filename(char *filename, 1088 const char *base_name, 1089 const char *kallsyms_filename) 1090 { 1091 char *name; 1092 1093 strcpy(filename, kallsyms_filename); 1094 name = strrchr(filename, '/'); 1095 if (!name) 1096 return false; 1097 1098 name += 1; 1099 1100 if (!strcmp(name, "kallsyms")) { 1101 strcpy(name, base_name); 1102 return true; 1103 } 1104 1105 return false; 1106 } 1107 1108 static int validate_kcore_modules(const char *kallsyms_filename, 1109 struct map *map) 1110 { 1111 struct map_groups *kmaps = map__kmaps(map); 1112 char modules_filename[PATH_MAX]; 1113 1114 if (!kmaps) 1115 return -EINVAL; 1116 1117 if (!filename_from_kallsyms_filename(modules_filename, "modules", 1118 kallsyms_filename)) 1119 return -EINVAL; 1120 1121 if (do_validate_kcore_modules(modules_filename, kmaps)) 1122 return -EINVAL; 1123 1124 return 0; 1125 } 1126 1127 static int validate_kcore_addresses(const char *kallsyms_filename, 1128 struct map *map) 1129 { 1130 struct kmap *kmap = map__kmap(map); 1131 1132 if (!kmap) 1133 return -EINVAL; 1134 1135 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) { 1136 u64 start; 1137 1138 if (kallsyms__get_function_start(kallsyms_filename, 1139 kmap->ref_reloc_sym->name, &start)) 1140 return -ENOENT; 1141 if (start != kmap->ref_reloc_sym->addr) 1142 return -EINVAL; 1143 } 1144 1145 return validate_kcore_modules(kallsyms_filename, map); 1146 } 1147 1148 struct kcore_mapfn_data { 1149 struct dso *dso; 1150 struct list_head maps; 1151 }; 1152 1153 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) 1154 { 1155 struct kcore_mapfn_data *md = data; 1156 struct map *map; 1157 1158 map = map__new2(start, md->dso); 1159 if (map == NULL) 1160 return -ENOMEM; 1161 1162 map->end = map->start + len; 1163 map->pgoff = pgoff; 1164 1165 list_add(&map->node, &md->maps); 1166 1167 return 0; 1168 } 1169 1170 /* 1171 * Merges map into map_groups by splitting the new map 1172 * within the existing map regions. 1173 */ 1174 int map_groups__merge_in(struct map_groups *kmaps, struct map *new_map) 1175 { 1176 struct map *old_map; 1177 LIST_HEAD(merged); 1178 1179 for (old_map = map_groups__first(kmaps); old_map; 1180 old_map = map_groups__next(old_map)) { 1181 1182 /* no overload with this one */ 1183 if (new_map->end < old_map->start || 1184 new_map->start >= old_map->end) 1185 continue; 1186 1187 if (new_map->start < old_map->start) { 1188 /* 1189 * |new...... 1190 * |old.... 1191 */ 1192 if (new_map->end < old_map->end) { 1193 /* 1194 * |new......| -> |new..| 1195 * |old....| -> |old....| 1196 */ 1197 new_map->end = old_map->start; 1198 } else { 1199 /* 1200 * |new.............| -> |new..| |new..| 1201 * |old....| -> |old....| 1202 */ 1203 struct map *m = map__clone(new_map); 1204 1205 if (!m) 1206 return -ENOMEM; 1207 1208 m->end = old_map->start; 1209 list_add_tail(&m->node, &merged); 1210 new_map->start = old_map->end; 1211 } 1212 } else { 1213 /* 1214 * |new...... 1215 * |old.... 1216 */ 1217 if (new_map->end < old_map->end) { 1218 /* 1219 * |new..| -> x 1220 * |old.........| -> |old.........| 1221 */ 1222 map__put(new_map); 1223 new_map = NULL; 1224 break; 1225 } else { 1226 /* 1227 * |new......| -> |new...| 1228 * |old....| -> |old....| 1229 */ 1230 new_map->start = old_map->end; 1231 } 1232 } 1233 } 1234 1235 while (!list_empty(&merged)) { 1236 old_map = list_entry(merged.next, struct map, node); 1237 list_del_init(&old_map->node); 1238 map_groups__insert(kmaps, old_map); 1239 map__put(old_map); 1240 } 1241 1242 if (new_map) { 1243 map_groups__insert(kmaps, new_map); 1244 map__put(new_map); 1245 } 1246 return 0; 1247 } 1248 1249 static int dso__load_kcore(struct dso *dso, struct map *map, 1250 const char *kallsyms_filename) 1251 { 1252 struct map_groups *kmaps = map__kmaps(map); 1253 struct kcore_mapfn_data md; 1254 struct map *old_map, *new_map, *replacement_map = NULL; 1255 struct machine *machine; 1256 bool is_64_bit; 1257 int err, fd; 1258 char kcore_filename[PATH_MAX]; 1259 u64 stext; 1260 1261 if (!kmaps) 1262 return -EINVAL; 1263 1264 machine = kmaps->machine; 1265 1266 /* This function requires that the map is the kernel map */ 1267 if (!__map__is_kernel(map)) 1268 return -EINVAL; 1269 1270 if (!filename_from_kallsyms_filename(kcore_filename, "kcore", 1271 kallsyms_filename)) 1272 return -EINVAL; 1273 1274 /* Modules and kernel must be present at their original addresses */ 1275 if (validate_kcore_addresses(kallsyms_filename, map)) 1276 return -EINVAL; 1277 1278 md.dso = dso; 1279 INIT_LIST_HEAD(&md.maps); 1280 1281 fd = open(kcore_filename, O_RDONLY); 1282 if (fd < 0) { 1283 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n", 1284 kcore_filename); 1285 return -EINVAL; 1286 } 1287 1288 /* Read new maps into temporary lists */ 1289 err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md, 1290 &is_64_bit); 1291 if (err) 1292 goto out_err; 1293 dso->is_64_bit = is_64_bit; 1294 1295 if (list_empty(&md.maps)) { 1296 err = -EINVAL; 1297 goto out_err; 1298 } 1299 1300 /* Remove old maps */ 1301 old_map = map_groups__first(kmaps); 1302 while (old_map) { 1303 struct map *next = map_groups__next(old_map); 1304 1305 /* 1306 * We need to preserve eBPF maps even if they are 1307 * covered by kcore, because we need to access 1308 * eBPF dso for source data. 1309 */ 1310 if (old_map != map && !__map__is_bpf_prog(old_map)) 1311 map_groups__remove(kmaps, old_map); 1312 old_map = next; 1313 } 1314 machine->trampolines_mapped = false; 1315 1316 /* Find the kernel map using the '_stext' symbol */ 1317 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) { 1318 list_for_each_entry(new_map, &md.maps, node) { 1319 if (stext >= new_map->start && stext < new_map->end) { 1320 replacement_map = new_map; 1321 break; 1322 } 1323 } 1324 } 1325 1326 if (!replacement_map) 1327 replacement_map = list_entry(md.maps.next, struct map, node); 1328 1329 /* Add new maps */ 1330 while (!list_empty(&md.maps)) { 1331 new_map = list_entry(md.maps.next, struct map, node); 1332 list_del_init(&new_map->node); 1333 if (new_map == replacement_map) { 1334 map->start = new_map->start; 1335 map->end = new_map->end; 1336 map->pgoff = new_map->pgoff; 1337 map->map_ip = new_map->map_ip; 1338 map->unmap_ip = new_map->unmap_ip; 1339 /* Ensure maps are correctly ordered */ 1340 map__get(map); 1341 map_groups__remove(kmaps, map); 1342 map_groups__insert(kmaps, map); 1343 map__put(map); 1344 map__put(new_map); 1345 } else { 1346 /* 1347 * Merge kcore map into existing maps, 1348 * and ensure that current maps (eBPF) 1349 * stay intact. 1350 */ 1351 if (map_groups__merge_in(kmaps, new_map)) 1352 goto out_err; 1353 } 1354 } 1355 1356 if (machine__is(machine, "x86_64")) { 1357 u64 addr; 1358 1359 /* 1360 * If one of the corresponding symbols is there, assume the 1361 * entry trampoline maps are too. 1362 */ 1363 if (!kallsyms__get_function_start(kallsyms_filename, 1364 ENTRY_TRAMPOLINE_NAME, 1365 &addr)) 1366 machine->trampolines_mapped = true; 1367 } 1368 1369 /* 1370 * Set the data type and long name so that kcore can be read via 1371 * dso__data_read_addr(). 1372 */ 1373 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1374 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE; 1375 else 1376 dso->binary_type = DSO_BINARY_TYPE__KCORE; 1377 dso__set_long_name(dso, strdup(kcore_filename), true); 1378 1379 close(fd); 1380 1381 if (map->prot & PROT_EXEC) 1382 pr_debug("Using %s for kernel object code\n", kcore_filename); 1383 else 1384 pr_debug("Using %s for kernel data\n", kcore_filename); 1385 1386 return 0; 1387 1388 out_err: 1389 while (!list_empty(&md.maps)) { 1390 map = list_entry(md.maps.next, struct map, node); 1391 list_del_init(&map->node); 1392 map__put(map); 1393 } 1394 close(fd); 1395 return -EINVAL; 1396 } 1397 1398 /* 1399 * If the kernel is relocated at boot time, kallsyms won't match. Compute the 1400 * delta based on the relocation reference symbol. 1401 */ 1402 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta) 1403 { 1404 u64 addr; 1405 1406 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) 1407 return 0; 1408 1409 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr)) 1410 return -1; 1411 1412 *delta = addr - kmap->ref_reloc_sym->addr; 1413 return 0; 1414 } 1415 1416 int __dso__load_kallsyms(struct dso *dso, const char *filename, 1417 struct map *map, bool no_kcore) 1418 { 1419 struct kmap *kmap = map__kmap(map); 1420 u64 delta = 0; 1421 1422 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 1423 return -1; 1424 1425 if (!kmap || !kmap->kmaps) 1426 return -1; 1427 1428 if (dso__load_all_kallsyms(dso, filename) < 0) 1429 return -1; 1430 1431 if (kallsyms__delta(kmap, filename, &delta)) 1432 return -1; 1433 1434 symbols__fixup_end(&dso->symbols); 1435 symbols__fixup_duplicate(&dso->symbols); 1436 1437 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1438 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1439 else 1440 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; 1441 1442 if (!no_kcore && !dso__load_kcore(dso, map, filename)) 1443 return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso); 1444 else 1445 return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map); 1446 } 1447 1448 int dso__load_kallsyms(struct dso *dso, const char *filename, 1449 struct map *map) 1450 { 1451 return __dso__load_kallsyms(dso, filename, map, false); 1452 } 1453 1454 static int dso__load_perf_map(const char *map_path, struct dso *dso) 1455 { 1456 char *line = NULL; 1457 size_t n; 1458 FILE *file; 1459 int nr_syms = 0; 1460 1461 file = fopen(map_path, "r"); 1462 if (file == NULL) 1463 goto out_failure; 1464 1465 while (!feof(file)) { 1466 u64 start, size; 1467 struct symbol *sym; 1468 int line_len, len; 1469 1470 line_len = getline(&line, &n, file); 1471 if (line_len < 0) 1472 break; 1473 1474 if (!line) 1475 goto out_failure; 1476 1477 line[--line_len] = '\0'; /* \n */ 1478 1479 len = hex2u64(line, &start); 1480 1481 len++; 1482 if (len + 2 >= line_len) 1483 continue; 1484 1485 len += hex2u64(line + len, &size); 1486 1487 len++; 1488 if (len + 2 >= line_len) 1489 continue; 1490 1491 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len); 1492 1493 if (sym == NULL) 1494 goto out_delete_line; 1495 1496 symbols__insert(&dso->symbols, sym); 1497 nr_syms++; 1498 } 1499 1500 free(line); 1501 fclose(file); 1502 1503 return nr_syms; 1504 1505 out_delete_line: 1506 free(line); 1507 out_failure: 1508 return -1; 1509 } 1510 1511 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, 1512 enum dso_binary_type type) 1513 { 1514 switch (type) { 1515 case DSO_BINARY_TYPE__JAVA_JIT: 1516 case DSO_BINARY_TYPE__DEBUGLINK: 1517 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO: 1518 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO: 1519 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO: 1520 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO: 1521 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: 1522 return !kmod && dso->kernel == DSO_TYPE_USER; 1523 1524 case DSO_BINARY_TYPE__KALLSYMS: 1525 case DSO_BINARY_TYPE__VMLINUX: 1526 case DSO_BINARY_TYPE__KCORE: 1527 return dso->kernel == DSO_TYPE_KERNEL; 1528 1529 case DSO_BINARY_TYPE__GUEST_KALLSYMS: 1530 case DSO_BINARY_TYPE__GUEST_VMLINUX: 1531 case DSO_BINARY_TYPE__GUEST_KCORE: 1532 return dso->kernel == DSO_TYPE_GUEST_KERNEL; 1533 1534 case DSO_BINARY_TYPE__GUEST_KMODULE: 1535 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP: 1536 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE: 1537 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP: 1538 /* 1539 * kernel modules know their symtab type - it's set when 1540 * creating a module dso in machine__findnew_module_map(). 1541 */ 1542 return kmod && dso->symtab_type == type; 1543 1544 case DSO_BINARY_TYPE__BUILD_ID_CACHE: 1545 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO: 1546 return true; 1547 1548 case DSO_BINARY_TYPE__BPF_PROG_INFO: 1549 case DSO_BINARY_TYPE__NOT_FOUND: 1550 default: 1551 return false; 1552 } 1553 } 1554 1555 /* Checks for the existence of the perf-<pid>.map file in two different 1556 * locations. First, if the process is a separate mount namespace, check in 1557 * that namespace using the pid of the innermost pid namespace. If's not in a 1558 * namespace, or the file can't be found there, try in the mount namespace of 1559 * the tracing process using our view of its pid. 1560 */ 1561 static int dso__find_perf_map(char *filebuf, size_t bufsz, 1562 struct nsinfo **nsip) 1563 { 1564 struct nscookie nsc; 1565 struct nsinfo *nsi; 1566 struct nsinfo *nnsi; 1567 int rc = -1; 1568 1569 nsi = *nsip; 1570 1571 if (nsi->need_setns) { 1572 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid); 1573 nsinfo__mountns_enter(nsi, &nsc); 1574 rc = access(filebuf, R_OK); 1575 nsinfo__mountns_exit(&nsc); 1576 if (rc == 0) 1577 return rc; 1578 } 1579 1580 nnsi = nsinfo__copy(nsi); 1581 if (nnsi) { 1582 nsinfo__put(nsi); 1583 1584 nnsi->need_setns = false; 1585 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid); 1586 *nsip = nnsi; 1587 rc = 0; 1588 } 1589 1590 return rc; 1591 } 1592 1593 int dso__load(struct dso *dso, struct map *map) 1594 { 1595 char *name; 1596 int ret = -1; 1597 u_int i; 1598 struct machine *machine; 1599 char *root_dir = (char *) ""; 1600 int ss_pos = 0; 1601 struct symsrc ss_[2]; 1602 struct symsrc *syms_ss = NULL, *runtime_ss = NULL; 1603 bool kmod; 1604 bool perfmap; 1605 unsigned char build_id[BUILD_ID_SIZE]; 1606 struct nscookie nsc; 1607 char newmapname[PATH_MAX]; 1608 const char *map_path = dso->long_name; 1609 1610 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0; 1611 if (perfmap) { 1612 if (dso->nsinfo && (dso__find_perf_map(newmapname, 1613 sizeof(newmapname), &dso->nsinfo) == 0)) { 1614 map_path = newmapname; 1615 } 1616 } 1617 1618 nsinfo__mountns_enter(dso->nsinfo, &nsc); 1619 pthread_mutex_lock(&dso->lock); 1620 1621 /* check again under the dso->lock */ 1622 if (dso__loaded(dso)) { 1623 ret = 1; 1624 goto out; 1625 } 1626 1627 if (map->groups && map->groups->machine) 1628 machine = map->groups->machine; 1629 else 1630 machine = NULL; 1631 1632 if (dso->kernel) { 1633 if (dso->kernel == DSO_TYPE_KERNEL) 1634 ret = dso__load_kernel_sym(dso, map); 1635 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1636 ret = dso__load_guest_kernel_sym(dso, map); 1637 1638 if (machine__is(machine, "x86_64")) 1639 machine__map_x86_64_entry_trampolines(machine, dso); 1640 goto out; 1641 } 1642 1643 dso->adjust_symbols = 0; 1644 1645 if (perfmap) { 1646 ret = dso__load_perf_map(map_path, dso); 1647 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : 1648 DSO_BINARY_TYPE__NOT_FOUND; 1649 goto out; 1650 } 1651 1652 if (machine) 1653 root_dir = machine->root_dir; 1654 1655 name = malloc(PATH_MAX); 1656 if (!name) 1657 goto out; 1658 1659 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || 1660 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP || 1661 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || 1662 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; 1663 1664 1665 /* 1666 * Read the build id if possible. This is required for 1667 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work 1668 */ 1669 if (!dso->has_build_id && 1670 is_regular_file(dso->long_name)) { 1671 __symbol__join_symfs(name, PATH_MAX, dso->long_name); 1672 if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0) 1673 dso__set_build_id(dso, build_id); 1674 } 1675 1676 /* 1677 * Iterate over candidate debug images. 1678 * Keep track of "interesting" ones (those which have a symtab, dynsym, 1679 * and/or opd section) for processing. 1680 */ 1681 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { 1682 struct symsrc *ss = &ss_[ss_pos]; 1683 bool next_slot = false; 1684 bool is_reg; 1685 bool nsexit; 1686 int sirc = -1; 1687 1688 enum dso_binary_type symtab_type = binary_type_symtab[i]; 1689 1690 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE || 1691 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO); 1692 1693 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type)) 1694 continue; 1695 1696 if (dso__read_binary_type_filename(dso, symtab_type, 1697 root_dir, name, PATH_MAX)) 1698 continue; 1699 1700 if (nsexit) 1701 nsinfo__mountns_exit(&nsc); 1702 1703 is_reg = is_regular_file(name); 1704 if (is_reg) 1705 sirc = symsrc__init(ss, dso, name, symtab_type); 1706 1707 if (nsexit) 1708 nsinfo__mountns_enter(dso->nsinfo, &nsc); 1709 1710 if (!is_reg || sirc < 0) 1711 continue; 1712 1713 if (!syms_ss && symsrc__has_symtab(ss)) { 1714 syms_ss = ss; 1715 next_slot = true; 1716 if (!dso->symsrc_filename) 1717 dso->symsrc_filename = strdup(name); 1718 } 1719 1720 if (!runtime_ss && symsrc__possibly_runtime(ss)) { 1721 runtime_ss = ss; 1722 next_slot = true; 1723 } 1724 1725 if (next_slot) { 1726 ss_pos++; 1727 1728 if (syms_ss && runtime_ss) 1729 break; 1730 } else { 1731 symsrc__destroy(ss); 1732 } 1733 1734 } 1735 1736 if (!runtime_ss && !syms_ss) 1737 goto out_free; 1738 1739 if (runtime_ss && !syms_ss) { 1740 syms_ss = runtime_ss; 1741 } 1742 1743 /* We'll have to hope for the best */ 1744 if (!runtime_ss && syms_ss) 1745 runtime_ss = syms_ss; 1746 1747 if (syms_ss) 1748 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod); 1749 else 1750 ret = -1; 1751 1752 if (ret > 0) { 1753 int nr_plt; 1754 1755 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss); 1756 if (nr_plt > 0) 1757 ret += nr_plt; 1758 } 1759 1760 for (; ss_pos > 0; ss_pos--) 1761 symsrc__destroy(&ss_[ss_pos - 1]); 1762 out_free: 1763 free(name); 1764 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) 1765 ret = 0; 1766 out: 1767 dso__set_loaded(dso); 1768 pthread_mutex_unlock(&dso->lock); 1769 nsinfo__mountns_exit(&nsc); 1770 1771 return ret; 1772 } 1773 1774 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name) 1775 { 1776 struct maps *maps = &mg->maps; 1777 struct map *map; 1778 struct rb_node *node; 1779 1780 down_read(&maps->lock); 1781 1782 for (node = maps->names.rb_node; node; ) { 1783 int rc; 1784 1785 map = rb_entry(node, struct map, rb_node_name); 1786 1787 rc = strcmp(map->dso->short_name, name); 1788 if (rc < 0) 1789 node = node->rb_left; 1790 else if (rc > 0) 1791 node = node->rb_right; 1792 else 1793 1794 goto out_unlock; 1795 } 1796 1797 map = NULL; 1798 1799 out_unlock: 1800 up_read(&maps->lock); 1801 return map; 1802 } 1803 1804 int dso__load_vmlinux(struct dso *dso, struct map *map, 1805 const char *vmlinux, bool vmlinux_allocated) 1806 { 1807 int err = -1; 1808 struct symsrc ss; 1809 char symfs_vmlinux[PATH_MAX]; 1810 enum dso_binary_type symtab_type; 1811 1812 if (vmlinux[0] == '/') 1813 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux); 1814 else 1815 symbol__join_symfs(symfs_vmlinux, vmlinux); 1816 1817 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1818 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1819 else 1820 symtab_type = DSO_BINARY_TYPE__VMLINUX; 1821 1822 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) 1823 return -1; 1824 1825 err = dso__load_sym(dso, map, &ss, &ss, 0); 1826 symsrc__destroy(&ss); 1827 1828 if (err > 0) { 1829 if (dso->kernel == DSO_TYPE_GUEST_KERNEL) 1830 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1831 else 1832 dso->binary_type = DSO_BINARY_TYPE__VMLINUX; 1833 dso__set_long_name(dso, vmlinux, vmlinux_allocated); 1834 dso__set_loaded(dso); 1835 pr_debug("Using %s for symbols\n", symfs_vmlinux); 1836 } 1837 1838 return err; 1839 } 1840 1841 int dso__load_vmlinux_path(struct dso *dso, struct map *map) 1842 { 1843 int i, err = 0; 1844 char *filename = NULL; 1845 1846 pr_debug("Looking at the vmlinux_path (%d entries long)\n", 1847 vmlinux_path__nr_entries + 1); 1848 1849 for (i = 0; i < vmlinux_path__nr_entries; ++i) { 1850 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false); 1851 if (err > 0) 1852 goto out; 1853 } 1854 1855 if (!symbol_conf.ignore_vmlinux_buildid) 1856 filename = dso__build_id_filename(dso, NULL, 0, false); 1857 if (filename != NULL) { 1858 err = dso__load_vmlinux(dso, map, filename, true); 1859 if (err > 0) 1860 goto out; 1861 free(filename); 1862 } 1863 out: 1864 return err; 1865 } 1866 1867 static bool visible_dir_filter(const char *name, struct dirent *d) 1868 { 1869 if (d->d_type != DT_DIR) 1870 return false; 1871 return lsdir_no_dot_filter(name, d); 1872 } 1873 1874 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) 1875 { 1876 char kallsyms_filename[PATH_MAX]; 1877 int ret = -1; 1878 struct strlist *dirs; 1879 struct str_node *nd; 1880 1881 dirs = lsdir(dir, visible_dir_filter); 1882 if (!dirs) 1883 return -1; 1884 1885 strlist__for_each_entry(nd, dirs) { 1886 scnprintf(kallsyms_filename, sizeof(kallsyms_filename), 1887 "%s/%s/kallsyms", dir, nd->s); 1888 if (!validate_kcore_addresses(kallsyms_filename, map)) { 1889 strlcpy(dir, kallsyms_filename, dir_sz); 1890 ret = 0; 1891 break; 1892 } 1893 } 1894 1895 strlist__delete(dirs); 1896 1897 return ret; 1898 } 1899 1900 /* 1901 * Use open(O_RDONLY) to check readability directly instead of access(R_OK) 1902 * since access(R_OK) only checks with real UID/GID but open() use effective 1903 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO). 1904 */ 1905 static bool filename__readable(const char *file) 1906 { 1907 int fd = open(file, O_RDONLY); 1908 if (fd < 0) 1909 return false; 1910 close(fd); 1911 return true; 1912 } 1913 1914 static char *dso__find_kallsyms(struct dso *dso, struct map *map) 1915 { 1916 u8 host_build_id[BUILD_ID_SIZE]; 1917 char sbuild_id[SBUILD_ID_SIZE]; 1918 bool is_host = false; 1919 char path[PATH_MAX]; 1920 1921 if (!dso->has_build_id) { 1922 /* 1923 * Last resort, if we don't have a build-id and couldn't find 1924 * any vmlinux file, try the running kernel kallsyms table. 1925 */ 1926 goto proc_kallsyms; 1927 } 1928 1929 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id, 1930 sizeof(host_build_id)) == 0) 1931 is_host = dso__build_id_equal(dso, host_build_id); 1932 1933 /* Try a fast path for /proc/kallsyms if possible */ 1934 if (is_host) { 1935 /* 1936 * Do not check the build-id cache, unless we know we cannot use 1937 * /proc/kcore or module maps don't match to /proc/kallsyms. 1938 * To check readability of /proc/kcore, do not use access(R_OK) 1939 * since /proc/kcore requires CAP_SYS_RAWIO to read and access 1940 * can't check it. 1941 */ 1942 if (filename__readable("/proc/kcore") && 1943 !validate_kcore_addresses("/proc/kallsyms", map)) 1944 goto proc_kallsyms; 1945 } 1946 1947 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); 1948 1949 /* Find kallsyms in build-id cache with kcore */ 1950 scnprintf(path, sizeof(path), "%s/%s/%s", 1951 buildid_dir, DSO__NAME_KCORE, sbuild_id); 1952 1953 if (!find_matching_kcore(map, path, sizeof(path))) 1954 return strdup(path); 1955 1956 /* Use current /proc/kallsyms if possible */ 1957 if (is_host) { 1958 proc_kallsyms: 1959 return strdup("/proc/kallsyms"); 1960 } 1961 1962 /* Finally, find a cache of kallsyms */ 1963 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) { 1964 pr_err("No kallsyms or vmlinux with build-id %s was found\n", 1965 sbuild_id); 1966 return NULL; 1967 } 1968 1969 return strdup(path); 1970 } 1971 1972 static int dso__load_kernel_sym(struct dso *dso, struct map *map) 1973 { 1974 int err; 1975 const char *kallsyms_filename = NULL; 1976 char *kallsyms_allocated_filename = NULL; 1977 /* 1978 * Step 1: if the user specified a kallsyms or vmlinux filename, use 1979 * it and only it, reporting errors to the user if it cannot be used. 1980 * 1981 * For instance, try to analyse an ARM perf.data file _without_ a 1982 * build-id, or if the user specifies the wrong path to the right 1983 * vmlinux file, obviously we can't fallback to another vmlinux (a 1984 * x86_86 one, on the machine where analysis is being performed, say), 1985 * or worse, /proc/kallsyms. 1986 * 1987 * If the specified file _has_ a build-id and there is a build-id 1988 * section in the perf.data file, we will still do the expected 1989 * validation in dso__load_vmlinux and will bail out if they don't 1990 * match. 1991 */ 1992 if (symbol_conf.kallsyms_name != NULL) { 1993 kallsyms_filename = symbol_conf.kallsyms_name; 1994 goto do_kallsyms; 1995 } 1996 1997 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) { 1998 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false); 1999 } 2000 2001 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { 2002 err = dso__load_vmlinux_path(dso, map); 2003 if (err > 0) 2004 return err; 2005 } 2006 2007 /* do not try local files if a symfs was given */ 2008 if (symbol_conf.symfs[0] != 0) 2009 return -1; 2010 2011 kallsyms_allocated_filename = dso__find_kallsyms(dso, map); 2012 if (!kallsyms_allocated_filename) 2013 return -1; 2014 2015 kallsyms_filename = kallsyms_allocated_filename; 2016 2017 do_kallsyms: 2018 err = dso__load_kallsyms(dso, kallsyms_filename, map); 2019 if (err > 0) 2020 pr_debug("Using %s for symbols\n", kallsyms_filename); 2021 free(kallsyms_allocated_filename); 2022 2023 if (err > 0 && !dso__is_kcore(dso)) { 2024 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS; 2025 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false); 2026 map__fixup_start(map); 2027 map__fixup_end(map); 2028 } 2029 2030 return err; 2031 } 2032 2033 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map) 2034 { 2035 int err; 2036 const char *kallsyms_filename = NULL; 2037 struct machine *machine; 2038 char path[PATH_MAX]; 2039 2040 if (!map->groups) { 2041 pr_debug("Guest kernel map hasn't the point to groups\n"); 2042 return -1; 2043 } 2044 machine = map->groups->machine; 2045 2046 if (machine__is_default_guest(machine)) { 2047 /* 2048 * if the user specified a vmlinux filename, use it and only 2049 * it, reporting errors to the user if it cannot be used. 2050 * Or use file guest_kallsyms inputted by user on commandline 2051 */ 2052 if (symbol_conf.default_guest_vmlinux_name != NULL) { 2053 err = dso__load_vmlinux(dso, map, 2054 symbol_conf.default_guest_vmlinux_name, 2055 false); 2056 return err; 2057 } 2058 2059 kallsyms_filename = symbol_conf.default_guest_kallsyms; 2060 if (!kallsyms_filename) 2061 return -1; 2062 } else { 2063 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 2064 kallsyms_filename = path; 2065 } 2066 2067 err = dso__load_kallsyms(dso, kallsyms_filename, map); 2068 if (err > 0) 2069 pr_debug("Using %s for symbols\n", kallsyms_filename); 2070 if (err > 0 && !dso__is_kcore(dso)) { 2071 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 2072 dso__set_long_name(dso, machine->mmap_name, false); 2073 map__fixup_start(map); 2074 map__fixup_end(map); 2075 } 2076 2077 return err; 2078 } 2079 2080 static void vmlinux_path__exit(void) 2081 { 2082 while (--vmlinux_path__nr_entries >= 0) 2083 zfree(&vmlinux_path[vmlinux_path__nr_entries]); 2084 vmlinux_path__nr_entries = 0; 2085 2086 zfree(&vmlinux_path); 2087 } 2088 2089 static const char * const vmlinux_paths[] = { 2090 "vmlinux", 2091 "/boot/vmlinux" 2092 }; 2093 2094 static const char * const vmlinux_paths_upd[] = { 2095 "/boot/vmlinux-%s", 2096 "/usr/lib/debug/boot/vmlinux-%s", 2097 "/lib/modules/%s/build/vmlinux", 2098 "/usr/lib/debug/lib/modules/%s/vmlinux", 2099 "/usr/lib/debug/boot/vmlinux-%s.debug" 2100 }; 2101 2102 static int vmlinux_path__add(const char *new_entry) 2103 { 2104 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry); 2105 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 2106 return -1; 2107 ++vmlinux_path__nr_entries; 2108 2109 return 0; 2110 } 2111 2112 static int vmlinux_path__init(struct perf_env *env) 2113 { 2114 struct utsname uts; 2115 char bf[PATH_MAX]; 2116 char *kernel_version; 2117 unsigned int i; 2118 2119 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) + 2120 ARRAY_SIZE(vmlinux_paths_upd))); 2121 if (vmlinux_path == NULL) 2122 return -1; 2123 2124 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++) 2125 if (vmlinux_path__add(vmlinux_paths[i]) < 0) 2126 goto out_fail; 2127 2128 /* only try kernel version if no symfs was given */ 2129 if (symbol_conf.symfs[0] != 0) 2130 return 0; 2131 2132 if (env) { 2133 kernel_version = env->os_release; 2134 } else { 2135 if (uname(&uts) < 0) 2136 goto out_fail; 2137 2138 kernel_version = uts.release; 2139 } 2140 2141 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) { 2142 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version); 2143 if (vmlinux_path__add(bf) < 0) 2144 goto out_fail; 2145 } 2146 2147 return 0; 2148 2149 out_fail: 2150 vmlinux_path__exit(); 2151 return -1; 2152 } 2153 2154 int setup_list(struct strlist **list, const char *list_str, 2155 const char *list_name) 2156 { 2157 if (list_str == NULL) 2158 return 0; 2159 2160 *list = strlist__new(list_str, NULL); 2161 if (!*list) { 2162 pr_err("problems parsing %s list\n", list_name); 2163 return -1; 2164 } 2165 2166 symbol_conf.has_filter = true; 2167 return 0; 2168 } 2169 2170 int setup_intlist(struct intlist **list, const char *list_str, 2171 const char *list_name) 2172 { 2173 if (list_str == NULL) 2174 return 0; 2175 2176 *list = intlist__new(list_str); 2177 if (!*list) { 2178 pr_err("problems parsing %s list\n", list_name); 2179 return -1; 2180 } 2181 return 0; 2182 } 2183 2184 static bool symbol__read_kptr_restrict(void) 2185 { 2186 bool value = false; 2187 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); 2188 2189 if (fp != NULL) { 2190 char line[8]; 2191 2192 if (fgets(line, sizeof(line), fp) != NULL) 2193 value = ((geteuid() != 0) || (getuid() != 0)) ? 2194 (atoi(line) != 0) : 2195 (atoi(line) == 2); 2196 2197 fclose(fp); 2198 } 2199 2200 return value; 2201 } 2202 2203 int symbol__annotation_init(void) 2204 { 2205 if (symbol_conf.init_annotation) 2206 return 0; 2207 2208 if (symbol_conf.initialized) { 2209 pr_err("Annotation needs to be init before symbol__init()\n"); 2210 return -1; 2211 } 2212 2213 symbol_conf.priv_size += sizeof(struct annotation); 2214 symbol_conf.init_annotation = true; 2215 return 0; 2216 } 2217 2218 int symbol__init(struct perf_env *env) 2219 { 2220 const char *symfs; 2221 2222 if (symbol_conf.initialized) 2223 return 0; 2224 2225 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); 2226 2227 symbol__elf_init(); 2228 2229 if (symbol_conf.sort_by_name) 2230 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - 2231 sizeof(struct symbol)); 2232 2233 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0) 2234 return -1; 2235 2236 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { 2237 pr_err("'.' is the only non valid --field-separator argument\n"); 2238 return -1; 2239 } 2240 2241 if (setup_list(&symbol_conf.dso_list, 2242 symbol_conf.dso_list_str, "dso") < 0) 2243 return -1; 2244 2245 if (setup_list(&symbol_conf.comm_list, 2246 symbol_conf.comm_list_str, "comm") < 0) 2247 goto out_free_dso_list; 2248 2249 if (setup_intlist(&symbol_conf.pid_list, 2250 symbol_conf.pid_list_str, "pid") < 0) 2251 goto out_free_comm_list; 2252 2253 if (setup_intlist(&symbol_conf.tid_list, 2254 symbol_conf.tid_list_str, "tid") < 0) 2255 goto out_free_pid_list; 2256 2257 if (setup_list(&symbol_conf.sym_list, 2258 symbol_conf.sym_list_str, "symbol") < 0) 2259 goto out_free_tid_list; 2260 2261 if (setup_list(&symbol_conf.bt_stop_list, 2262 symbol_conf.bt_stop_list_str, "symbol") < 0) 2263 goto out_free_sym_list; 2264 2265 /* 2266 * A path to symbols of "/" is identical to "" 2267 * reset here for simplicity. 2268 */ 2269 symfs = realpath(symbol_conf.symfs, NULL); 2270 if (symfs == NULL) 2271 symfs = symbol_conf.symfs; 2272 if (strcmp(symfs, "/") == 0) 2273 symbol_conf.symfs = ""; 2274 if (symfs != symbol_conf.symfs) 2275 free((void *)symfs); 2276 2277 symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); 2278 2279 symbol_conf.initialized = true; 2280 return 0; 2281 2282 out_free_sym_list: 2283 strlist__delete(symbol_conf.sym_list); 2284 out_free_tid_list: 2285 intlist__delete(symbol_conf.tid_list); 2286 out_free_pid_list: 2287 intlist__delete(symbol_conf.pid_list); 2288 out_free_comm_list: 2289 strlist__delete(symbol_conf.comm_list); 2290 out_free_dso_list: 2291 strlist__delete(symbol_conf.dso_list); 2292 return -1; 2293 } 2294 2295 void symbol__exit(void) 2296 { 2297 if (!symbol_conf.initialized) 2298 return; 2299 strlist__delete(symbol_conf.bt_stop_list); 2300 strlist__delete(symbol_conf.sym_list); 2301 strlist__delete(symbol_conf.dso_list); 2302 strlist__delete(symbol_conf.comm_list); 2303 intlist__delete(symbol_conf.tid_list); 2304 intlist__delete(symbol_conf.pid_list); 2305 vmlinux_path__exit(); 2306 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; 2307 symbol_conf.bt_stop_list = NULL; 2308 symbol_conf.initialized = false; 2309 } 2310 2311 int symbol__config_symfs(const struct option *opt __maybe_unused, 2312 const char *dir, int unset __maybe_unused) 2313 { 2314 char *bf = NULL; 2315 int ret; 2316 2317 symbol_conf.symfs = strdup(dir); 2318 if (symbol_conf.symfs == NULL) 2319 return -ENOMEM; 2320 2321 /* skip the locally configured cache if a symfs is given, and 2322 * config buildid dir to symfs/.debug 2323 */ 2324 ret = asprintf(&bf, "%s/%s", dir, ".debug"); 2325 if (ret < 0) 2326 return -ENOMEM; 2327 2328 set_buildid_dir(bf); 2329 2330 free(bf); 2331 return 0; 2332 } 2333 2334 struct mem_info *mem_info__get(struct mem_info *mi) 2335 { 2336 if (mi) 2337 refcount_inc(&mi->refcnt); 2338 return mi; 2339 } 2340 2341 void mem_info__put(struct mem_info *mi) 2342 { 2343 if (mi && refcount_dec_and_test(&mi->refcnt)) 2344 free(mi); 2345 } 2346 2347 struct mem_info *mem_info__new(void) 2348 { 2349 struct mem_info *mi = zalloc(sizeof(*mi)); 2350 2351 if (mi) 2352 refcount_set(&mi->refcnt, 1); 2353 return mi; 2354 } 2355 2356 struct block_info *block_info__get(struct block_info *bi) 2357 { 2358 if (bi) 2359 refcount_inc(&bi->refcnt); 2360 return bi; 2361 } 2362 2363 void block_info__put(struct block_info *bi) 2364 { 2365 if (bi && refcount_dec_and_test(&bi->refcnt)) 2366 free(bi); 2367 } 2368 2369 struct block_info *block_info__new(void) 2370 { 2371 struct block_info *bi = zalloc(sizeof(*bi)); 2372 2373 if (bi) 2374 refcount_set(&bi->refcnt, 1); 2375 return bi; 2376 } 2377