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/capability.h> 8 #include <linux/kernel.h> 9 #include <linux/mman.h> 10 #include <linux/string.h> 11 #include <linux/time64.h> 12 #include <sys/types.h> 13 #include <sys/stat.h> 14 #include <sys/param.h> 15 #include <fcntl.h> 16 #include <unistd.h> 17 #include <inttypes.h> 18 #include "annotate.h" 19 #include "build-id.h" 20 #include "cap.h" 21 #include "dso.h" 22 #include "util.h" // lsdir() 23 #include "debug.h" 24 #include "event.h" 25 #include "machine.h" 26 #include "map.h" 27 #include "symbol.h" 28 #include "map_symbol.h" 29 #include "mem-events.h" 30 #include "symsrc.h" 31 #include "strlist.h" 32 #include "intlist.h" 33 #include "namespaces.h" 34 #include "header.h" 35 #include "path.h" 36 #include <linux/ctype.h> 37 #include <linux/zalloc.h> 38 39 #include <elf.h> 40 #include <limits.h> 41 #include <symbol/kallsyms.h> 42 #include <sys/utsname.h> 43 44 static int dso__load_kernel_sym(struct dso *dso, struct map *map); 45 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map); 46 static bool symbol__is_idle(const char *name); 47 48 int vmlinux_path__nr_entries; 49 char **vmlinux_path; 50 51 struct symbol_conf symbol_conf = { 52 .nanosecs = false, 53 .use_modules = true, 54 .try_vmlinux_path = true, 55 .demangle = true, 56 .demangle_kernel = false, 57 .cumulate_callchain = true, 58 .time_quantum = 100 * NSEC_PER_MSEC, /* 100ms */ 59 .show_hist_headers = true, 60 .symfs = "", 61 .event_group = true, 62 .inline_name = true, 63 .res_sample = 0, 64 }; 65 66 static enum dso_binary_type binary_type_symtab[] = { 67 DSO_BINARY_TYPE__KALLSYMS, 68 DSO_BINARY_TYPE__GUEST_KALLSYMS, 69 DSO_BINARY_TYPE__JAVA_JIT, 70 DSO_BINARY_TYPE__DEBUGLINK, 71 DSO_BINARY_TYPE__BUILD_ID_CACHE, 72 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO, 73 DSO_BINARY_TYPE__FEDORA_DEBUGINFO, 74 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, 75 DSO_BINARY_TYPE__BUILDID_DEBUGINFO, 76 DSO_BINARY_TYPE__SYSTEM_PATH_DSO, 77 DSO_BINARY_TYPE__GUEST_KMODULE, 78 DSO_BINARY_TYPE__GUEST_KMODULE_COMP, 79 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, 80 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP, 81 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, 82 DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO, 83 DSO_BINARY_TYPE__NOT_FOUND, 84 }; 85 86 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) 87 88 static bool symbol_type__filter(char symbol_type) 89 { 90 symbol_type = toupper(symbol_type); 91 return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B'; 92 } 93 94 static int prefix_underscores_count(const char *str) 95 { 96 const char *tail = str; 97 98 while (*tail == '_') 99 tail++; 100 101 return tail - str; 102 } 103 104 const char * __weak arch__normalize_symbol_name(const char *name) 105 { 106 return name; 107 } 108 109 int __weak arch__compare_symbol_names(const char *namea, const char *nameb) 110 { 111 return strcmp(namea, nameb); 112 } 113 114 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb, 115 unsigned int n) 116 { 117 return strncmp(namea, nameb, n); 118 } 119 120 int __weak arch__choose_best_symbol(struct symbol *syma, 121 struct symbol *symb __maybe_unused) 122 { 123 /* Avoid "SyS" kernel syscall aliases */ 124 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3)) 125 return SYMBOL_B; 126 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10)) 127 return SYMBOL_B; 128 129 return SYMBOL_A; 130 } 131 132 static int choose_best_symbol(struct symbol *syma, struct symbol *symb) 133 { 134 s64 a; 135 s64 b; 136 size_t na, nb; 137 138 /* Prefer a symbol with non zero length */ 139 a = syma->end - syma->start; 140 b = symb->end - symb->start; 141 if ((b == 0) && (a > 0)) 142 return SYMBOL_A; 143 else if ((a == 0) && (b > 0)) 144 return SYMBOL_B; 145 146 /* Prefer a non weak symbol over a weak one */ 147 a = syma->binding == STB_WEAK; 148 b = symb->binding == STB_WEAK; 149 if (b && !a) 150 return SYMBOL_A; 151 if (a && !b) 152 return SYMBOL_B; 153 154 /* Prefer a global symbol over a non global one */ 155 a = syma->binding == STB_GLOBAL; 156 b = symb->binding == STB_GLOBAL; 157 if (a && !b) 158 return SYMBOL_A; 159 if (b && !a) 160 return SYMBOL_B; 161 162 /* Prefer a symbol with less underscores */ 163 a = prefix_underscores_count(syma->name); 164 b = prefix_underscores_count(symb->name); 165 if (b > a) 166 return SYMBOL_A; 167 else if (a > b) 168 return SYMBOL_B; 169 170 /* Choose the symbol with the longest name */ 171 na = strlen(syma->name); 172 nb = strlen(symb->name); 173 if (na > nb) 174 return SYMBOL_A; 175 else if (na < nb) 176 return SYMBOL_B; 177 178 return arch__choose_best_symbol(syma, symb); 179 } 180 181 void symbols__fixup_duplicate(struct rb_root_cached *symbols) 182 { 183 struct rb_node *nd; 184 struct symbol *curr, *next; 185 186 if (symbol_conf.allow_aliases) 187 return; 188 189 nd = rb_first_cached(symbols); 190 191 while (nd) { 192 curr = rb_entry(nd, struct symbol, rb_node); 193 again: 194 nd = rb_next(&curr->rb_node); 195 if (!nd) 196 break; 197 198 next = rb_entry(nd, struct symbol, rb_node); 199 if (curr->start != next->start) 200 continue; 201 202 if (choose_best_symbol(curr, next) == SYMBOL_A) { 203 if (next->type == STT_GNU_IFUNC) 204 curr->ifunc_alias = true; 205 rb_erase_cached(&next->rb_node, symbols); 206 symbol__delete(next); 207 goto again; 208 } else { 209 if (curr->type == STT_GNU_IFUNC) 210 next->ifunc_alias = true; 211 nd = rb_next(&curr->rb_node); 212 rb_erase_cached(&curr->rb_node, symbols); 213 symbol__delete(curr); 214 } 215 } 216 } 217 218 /* Update zero-sized symbols using the address of the next symbol */ 219 void symbols__fixup_end(struct rb_root_cached *symbols, bool is_kallsyms) 220 { 221 struct rb_node *nd, *prevnd = rb_first_cached(symbols); 222 struct symbol *curr, *prev; 223 224 if (prevnd == NULL) 225 return; 226 227 curr = rb_entry(prevnd, struct symbol, rb_node); 228 229 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { 230 prev = curr; 231 curr = rb_entry(nd, struct symbol, rb_node); 232 233 /* 234 * On some architecture kernel text segment start is located at 235 * some low memory address, while modules are located at high 236 * memory addresses (or vice versa). The gap between end of 237 * kernel text segment and beginning of first module's text 238 * segment is very big. Therefore do not fill this gap and do 239 * not assign it to the kernel dso map (kallsyms). 240 * 241 * In kallsyms, it determines module symbols using '[' character 242 * like in: 243 * ffffffffc1937000 T hdmi_driver_init [snd_hda_codec_hdmi] 244 */ 245 if (prev->end == prev->start) { 246 /* Last kernel/module symbol mapped to end of page */ 247 if (is_kallsyms && (!strchr(prev->name, '[') != 248 !strchr(curr->name, '['))) 249 prev->end = roundup(prev->end + 4096, 4096); 250 else 251 prev->end = curr->start; 252 253 pr_debug4("%s sym:%s end:%#" PRIx64 "\n", 254 __func__, prev->name, prev->end); 255 } 256 } 257 258 /* Last entry */ 259 if (curr->end == curr->start) 260 curr->end = roundup(curr->start, 4096) + 4096; 261 } 262 263 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name) 264 { 265 size_t namelen = strlen(name) + 1; 266 struct symbol *sym = calloc(1, (symbol_conf.priv_size + 267 sizeof(*sym) + namelen)); 268 if (sym == NULL) 269 return NULL; 270 271 if (symbol_conf.priv_size) { 272 if (symbol_conf.init_annotation) { 273 struct annotation *notes = (void *)sym; 274 annotation__init(notes); 275 } 276 sym = ((void *)sym) + symbol_conf.priv_size; 277 } 278 279 sym->start = start; 280 sym->end = len ? start + len : start; 281 sym->type = type; 282 sym->binding = binding; 283 sym->namelen = namelen - 1; 284 285 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", 286 __func__, name, start, sym->end); 287 memcpy(sym->name, name, namelen); 288 289 return sym; 290 } 291 292 void symbol__delete(struct symbol *sym) 293 { 294 if (symbol_conf.priv_size) { 295 if (symbol_conf.init_annotation) { 296 struct annotation *notes = symbol__annotation(sym); 297 298 annotation__exit(notes); 299 } 300 } 301 free(((void *)sym) - symbol_conf.priv_size); 302 } 303 304 void symbols__delete(struct rb_root_cached *symbols) 305 { 306 struct symbol *pos; 307 struct rb_node *next = rb_first_cached(symbols); 308 309 while (next) { 310 pos = rb_entry(next, struct symbol, rb_node); 311 next = rb_next(&pos->rb_node); 312 rb_erase_cached(&pos->rb_node, symbols); 313 symbol__delete(pos); 314 } 315 } 316 317 void __symbols__insert(struct rb_root_cached *symbols, 318 struct symbol *sym, bool kernel) 319 { 320 struct rb_node **p = &symbols->rb_root.rb_node; 321 struct rb_node *parent = NULL; 322 const u64 ip = sym->start; 323 struct symbol *s; 324 bool leftmost = true; 325 326 if (kernel) { 327 const char *name = sym->name; 328 /* 329 * ppc64 uses function descriptors and appends a '.' to the 330 * start of every instruction address. Remove it. 331 */ 332 if (name[0] == '.') 333 name++; 334 sym->idle = symbol__is_idle(name); 335 } 336 337 while (*p != NULL) { 338 parent = *p; 339 s = rb_entry(parent, struct symbol, rb_node); 340 if (ip < s->start) 341 p = &(*p)->rb_left; 342 else { 343 p = &(*p)->rb_right; 344 leftmost = false; 345 } 346 } 347 rb_link_node(&sym->rb_node, parent, p); 348 rb_insert_color_cached(&sym->rb_node, symbols, leftmost); 349 } 350 351 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym) 352 { 353 __symbols__insert(symbols, sym, false); 354 } 355 356 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip) 357 { 358 struct rb_node *n; 359 360 if (symbols == NULL) 361 return NULL; 362 363 n = symbols->rb_root.rb_node; 364 365 while (n) { 366 struct symbol *s = rb_entry(n, struct symbol, rb_node); 367 368 if (ip < s->start) 369 n = n->rb_left; 370 else if (ip > s->end || (ip == s->end && ip != s->start)) 371 n = n->rb_right; 372 else 373 return s; 374 } 375 376 return NULL; 377 } 378 379 static struct symbol *symbols__first(struct rb_root_cached *symbols) 380 { 381 struct rb_node *n = rb_first_cached(symbols); 382 383 if (n) 384 return rb_entry(n, struct symbol, rb_node); 385 386 return NULL; 387 } 388 389 static struct symbol *symbols__last(struct rb_root_cached *symbols) 390 { 391 struct rb_node *n = rb_last(&symbols->rb_root); 392 393 if (n) 394 return rb_entry(n, struct symbol, rb_node); 395 396 return NULL; 397 } 398 399 static struct symbol *symbols__next(struct symbol *sym) 400 { 401 struct rb_node *n = rb_next(&sym->rb_node); 402 403 if (n) 404 return rb_entry(n, struct symbol, rb_node); 405 406 return NULL; 407 } 408 409 static int symbols__sort_name_cmp(const void *vlhs, const void *vrhs) 410 { 411 const struct symbol *lhs = *((const struct symbol **)vlhs); 412 const struct symbol *rhs = *((const struct symbol **)vrhs); 413 414 return strcmp(lhs->name, rhs->name); 415 } 416 417 static struct symbol **symbols__sort_by_name(struct rb_root_cached *source, size_t *len) 418 { 419 struct rb_node *nd; 420 struct symbol **result; 421 size_t i = 0, size = 0; 422 423 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) 424 size++; 425 426 result = malloc(sizeof(*result) * size); 427 if (!result) 428 return NULL; 429 430 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) { 431 struct symbol *pos = rb_entry(nd, struct symbol, rb_node); 432 433 result[i++] = pos; 434 } 435 qsort(result, size, sizeof(*result), symbols__sort_name_cmp); 436 *len = size; 437 return result; 438 } 439 440 int symbol__match_symbol_name(const char *name, const char *str, 441 enum symbol_tag_include includes) 442 { 443 const char *versioning; 444 445 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY && 446 (versioning = strstr(name, "@@"))) { 447 int len = strlen(str); 448 449 if (len < versioning - name) 450 len = versioning - name; 451 452 return arch__compare_symbol_names_n(name, str, len); 453 } else 454 return arch__compare_symbol_names(name, str); 455 } 456 457 static struct symbol *symbols__find_by_name(struct symbol *symbols[], 458 size_t symbols_len, 459 const char *name, 460 enum symbol_tag_include includes, 461 size_t *found_idx) 462 { 463 size_t i, lower = 0, upper = symbols_len; 464 struct symbol *s = NULL; 465 466 if (found_idx) 467 *found_idx = SIZE_MAX; 468 469 if (!symbols_len) 470 return NULL; 471 472 while (lower < upper) { 473 int cmp; 474 475 i = (lower + upper) / 2; 476 cmp = symbol__match_symbol_name(symbols[i]->name, name, includes); 477 478 if (cmp > 0) 479 upper = i; 480 else if (cmp < 0) 481 lower = i + 1; 482 else { 483 if (found_idx) 484 *found_idx = i; 485 s = symbols[i]; 486 break; 487 } 488 } 489 if (s && includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY) { 490 /* return first symbol that has same name (if any) */ 491 for (; i > 0; i--) { 492 struct symbol *tmp = symbols[i - 1]; 493 494 if (!arch__compare_symbol_names(tmp->name, s->name)) { 495 if (found_idx) 496 *found_idx = i - 1; 497 s = tmp; 498 } else 499 break; 500 } 501 } 502 assert(!found_idx || !s || s == symbols[*found_idx]); 503 return s; 504 } 505 506 void dso__reset_find_symbol_cache(struct dso *dso) 507 { 508 dso->last_find_result.addr = 0; 509 dso->last_find_result.symbol = NULL; 510 } 511 512 void dso__insert_symbol(struct dso *dso, struct symbol *sym) 513 { 514 __symbols__insert(&dso->symbols, sym, dso->kernel); 515 516 /* update the symbol cache if necessary */ 517 if (dso->last_find_result.addr >= sym->start && 518 (dso->last_find_result.addr < sym->end || 519 sym->start == sym->end)) { 520 dso->last_find_result.symbol = sym; 521 } 522 } 523 524 void dso__delete_symbol(struct dso *dso, struct symbol *sym) 525 { 526 rb_erase_cached(&sym->rb_node, &dso->symbols); 527 symbol__delete(sym); 528 dso__reset_find_symbol_cache(dso); 529 } 530 531 struct symbol *dso__find_symbol(struct dso *dso, u64 addr) 532 { 533 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) { 534 dso->last_find_result.addr = addr; 535 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr); 536 } 537 538 return dso->last_find_result.symbol; 539 } 540 541 struct symbol *dso__find_symbol_nocache(struct dso *dso, u64 addr) 542 { 543 return symbols__find(&dso->symbols, addr); 544 } 545 546 struct symbol *dso__first_symbol(struct dso *dso) 547 { 548 return symbols__first(&dso->symbols); 549 } 550 551 struct symbol *dso__last_symbol(struct dso *dso) 552 { 553 return symbols__last(&dso->symbols); 554 } 555 556 struct symbol *dso__next_symbol(struct symbol *sym) 557 { 558 return symbols__next(sym); 559 } 560 561 struct symbol *dso__next_symbol_by_name(struct dso *dso, size_t *idx) 562 { 563 if (*idx + 1 >= dso->symbol_names_len) 564 return NULL; 565 566 ++*idx; 567 return dso->symbol_names[*idx]; 568 } 569 570 /* 571 * Returns first symbol that matched with @name. 572 */ 573 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name, size_t *idx) 574 { 575 struct symbol *s = symbols__find_by_name(dso->symbol_names, dso->symbol_names_len, 576 name, SYMBOL_TAG_INCLUDE__NONE, idx); 577 if (!s) 578 s = symbols__find_by_name(dso->symbol_names, dso->symbol_names_len, 579 name, SYMBOL_TAG_INCLUDE__DEFAULT_ONLY, idx); 580 return s; 581 } 582 583 void dso__sort_by_name(struct dso *dso) 584 { 585 mutex_lock(&dso->lock); 586 if (!dso__sorted_by_name(dso)) { 587 size_t len; 588 589 dso->symbol_names = symbols__sort_by_name(&dso->symbols, &len); 590 if (dso->symbol_names) { 591 dso->symbol_names_len = len; 592 dso__set_sorted_by_name(dso); 593 } 594 } 595 mutex_unlock(&dso->lock); 596 } 597 598 /* 599 * While we find nice hex chars, build a long_val. 600 * Return number of chars processed. 601 */ 602 static int hex2u64(const char *ptr, u64 *long_val) 603 { 604 char *p; 605 606 *long_val = strtoull(ptr, &p, 16); 607 608 return p - ptr; 609 } 610 611 612 int modules__parse(const char *filename, void *arg, 613 int (*process_module)(void *arg, const char *name, 614 u64 start, u64 size)) 615 { 616 char *line = NULL; 617 size_t n; 618 FILE *file; 619 int err = 0; 620 621 file = fopen(filename, "r"); 622 if (file == NULL) 623 return -1; 624 625 while (1) { 626 char name[PATH_MAX]; 627 u64 start, size; 628 char *sep, *endptr; 629 ssize_t line_len; 630 631 line_len = getline(&line, &n, file); 632 if (line_len < 0) { 633 if (feof(file)) 634 break; 635 err = -1; 636 goto out; 637 } 638 639 if (!line) { 640 err = -1; 641 goto out; 642 } 643 644 line[--line_len] = '\0'; /* \n */ 645 646 sep = strrchr(line, 'x'); 647 if (sep == NULL) 648 continue; 649 650 hex2u64(sep + 1, &start); 651 652 sep = strchr(line, ' '); 653 if (sep == NULL) 654 continue; 655 656 *sep = '\0'; 657 658 scnprintf(name, sizeof(name), "[%s]", line); 659 660 size = strtoul(sep + 1, &endptr, 0); 661 if (*endptr != ' ' && *endptr != '\t') 662 continue; 663 664 err = process_module(arg, name, start, size); 665 if (err) 666 break; 667 } 668 out: 669 free(line); 670 fclose(file); 671 return err; 672 } 673 674 /* 675 * These are symbols in the kernel image, so make sure that 676 * sym is from a kernel DSO. 677 */ 678 static bool symbol__is_idle(const char *name) 679 { 680 const char * const idle_symbols[] = { 681 "acpi_idle_do_entry", 682 "acpi_processor_ffh_cstate_enter", 683 "arch_cpu_idle", 684 "cpu_idle", 685 "cpu_startup_entry", 686 "idle_cpu", 687 "intel_idle", 688 "intel_idle_ibrs", 689 "default_idle", 690 "native_safe_halt", 691 "enter_idle", 692 "exit_idle", 693 "mwait_idle", 694 "mwait_idle_with_hints", 695 "mwait_idle_with_hints.constprop.0", 696 "poll_idle", 697 "ppc64_runlatch_off", 698 "pseries_dedicated_idle_sleep", 699 "psw_idle", 700 "psw_idle_exit", 701 NULL 702 }; 703 int i; 704 static struct strlist *idle_symbols_list; 705 706 if (idle_symbols_list) 707 return strlist__has_entry(idle_symbols_list, name); 708 709 idle_symbols_list = strlist__new(NULL, NULL); 710 711 for (i = 0; idle_symbols[i]; i++) 712 strlist__add(idle_symbols_list, idle_symbols[i]); 713 714 return strlist__has_entry(idle_symbols_list, name); 715 } 716 717 static int map__process_kallsym_symbol(void *arg, const char *name, 718 char type, u64 start) 719 { 720 struct symbol *sym; 721 struct dso *dso = arg; 722 struct rb_root_cached *root = &dso->symbols; 723 724 if (!symbol_type__filter(type)) 725 return 0; 726 727 /* Ignore local symbols for ARM modules */ 728 if (name[0] == '$') 729 return 0; 730 731 /* 732 * module symbols are not sorted so we add all 733 * symbols, setting length to 0, and rely on 734 * symbols__fixup_end() to fix it up. 735 */ 736 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name); 737 if (sym == NULL) 738 return -ENOMEM; 739 /* 740 * We will pass the symbols to the filter later, in 741 * map__split_kallsyms, when we have split the maps per module 742 */ 743 __symbols__insert(root, sym, !strchr(name, '[')); 744 745 return 0; 746 } 747 748 /* 749 * Loads the function entries in /proc/kallsyms into kernel_map->dso, 750 * so that we can in the next step set the symbol ->end address and then 751 * call kernel_maps__split_kallsyms. 752 */ 753 static int dso__load_all_kallsyms(struct dso *dso, const char *filename) 754 { 755 return kallsyms__parse(filename, dso, map__process_kallsym_symbol); 756 } 757 758 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso) 759 { 760 struct map *curr_map; 761 struct symbol *pos; 762 int count = 0; 763 struct rb_root_cached old_root = dso->symbols; 764 struct rb_root_cached *root = &dso->symbols; 765 struct rb_node *next = rb_first_cached(root); 766 767 if (!kmaps) 768 return -1; 769 770 *root = RB_ROOT_CACHED; 771 772 while (next) { 773 struct dso *curr_map_dso; 774 char *module; 775 776 pos = rb_entry(next, struct symbol, rb_node); 777 next = rb_next(&pos->rb_node); 778 779 rb_erase_cached(&pos->rb_node, &old_root); 780 RB_CLEAR_NODE(&pos->rb_node); 781 module = strchr(pos->name, '\t'); 782 if (module) 783 *module = '\0'; 784 785 curr_map = maps__find(kmaps, pos->start); 786 787 if (!curr_map) { 788 symbol__delete(pos); 789 continue; 790 } 791 curr_map_dso = map__dso(curr_map); 792 pos->start -= map__start(curr_map) - map__pgoff(curr_map); 793 if (pos->end > map__end(curr_map)) 794 pos->end = map__end(curr_map); 795 if (pos->end) 796 pos->end -= map__start(curr_map) - map__pgoff(curr_map); 797 symbols__insert(&curr_map_dso->symbols, pos); 798 ++count; 799 } 800 801 /* Symbols have been adjusted */ 802 dso->adjust_symbols = 1; 803 804 return count; 805 } 806 807 /* 808 * Split the symbols into maps, making sure there are no overlaps, i.e. the 809 * kernel range is broken in several maps, named [kernel].N, as we don't have 810 * the original ELF section names vmlinux have. 811 */ 812 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta, 813 struct map *initial_map) 814 { 815 struct machine *machine; 816 struct map *curr_map = initial_map; 817 struct symbol *pos; 818 int count = 0, moved = 0; 819 struct rb_root_cached *root = &dso->symbols; 820 struct rb_node *next = rb_first_cached(root); 821 int kernel_range = 0; 822 bool x86_64; 823 824 if (!kmaps) 825 return -1; 826 827 machine = maps__machine(kmaps); 828 829 x86_64 = machine__is(machine, "x86_64"); 830 831 while (next) { 832 char *module; 833 834 pos = rb_entry(next, struct symbol, rb_node); 835 next = rb_next(&pos->rb_node); 836 837 module = strchr(pos->name, '\t'); 838 if (module) { 839 struct dso *curr_map_dso; 840 841 if (!symbol_conf.use_modules) 842 goto discard_symbol; 843 844 *module++ = '\0'; 845 curr_map_dso = map__dso(curr_map); 846 if (strcmp(curr_map_dso->short_name, module)) { 847 if (!RC_CHK_EQUAL(curr_map, initial_map) && 848 dso->kernel == DSO_SPACE__KERNEL_GUEST && 849 machine__is_default_guest(machine)) { 850 /* 851 * We assume all symbols of a module are 852 * continuous in * kallsyms, so curr_map 853 * points to a module and all its 854 * symbols are in its kmap. Mark it as 855 * loaded. 856 */ 857 dso__set_loaded(curr_map_dso); 858 } 859 860 curr_map = maps__find_by_name(kmaps, module); 861 if (curr_map == NULL) { 862 pr_debug("%s/proc/{kallsyms,modules} " 863 "inconsistency while looking " 864 "for \"%s\" module!\n", 865 machine->root_dir, module); 866 curr_map = initial_map; 867 goto discard_symbol; 868 } 869 curr_map_dso = map__dso(curr_map); 870 if (curr_map_dso->loaded && 871 !machine__is_default_guest(machine)) 872 goto discard_symbol; 873 } 874 /* 875 * So that we look just like we get from .ko files, 876 * i.e. not prelinked, relative to initial_map->start. 877 */ 878 pos->start = map__map_ip(curr_map, pos->start); 879 pos->end = map__map_ip(curr_map, pos->end); 880 } else if (x86_64 && is_entry_trampoline(pos->name)) { 881 /* 882 * These symbols are not needed anymore since the 883 * trampoline maps refer to the text section and it's 884 * symbols instead. Avoid having to deal with 885 * relocations, and the assumption that the first symbol 886 * is the start of kernel text, by simply removing the 887 * symbols at this point. 888 */ 889 goto discard_symbol; 890 } else if (curr_map != initial_map) { 891 char dso_name[PATH_MAX]; 892 struct dso *ndso; 893 894 if (delta) { 895 /* Kernel was relocated at boot time */ 896 pos->start -= delta; 897 pos->end -= delta; 898 } 899 900 if (count == 0) { 901 curr_map = initial_map; 902 goto add_symbol; 903 } 904 905 if (dso->kernel == DSO_SPACE__KERNEL_GUEST) 906 snprintf(dso_name, sizeof(dso_name), 907 "[guest.kernel].%d", 908 kernel_range++); 909 else 910 snprintf(dso_name, sizeof(dso_name), 911 "[kernel].%d", 912 kernel_range++); 913 914 ndso = dso__new(dso_name); 915 if (ndso == NULL) 916 return -1; 917 918 ndso->kernel = dso->kernel; 919 920 curr_map = map__new2(pos->start, ndso); 921 if (curr_map == NULL) { 922 dso__put(ndso); 923 return -1; 924 } 925 926 map__set_mapping_type(curr_map, MAPPING_TYPE__IDENTITY); 927 if (maps__insert(kmaps, curr_map)) { 928 dso__put(ndso); 929 return -1; 930 } 931 ++kernel_range; 932 } else if (delta) { 933 /* Kernel was relocated at boot time */ 934 pos->start -= delta; 935 pos->end -= delta; 936 } 937 add_symbol: 938 if (curr_map != initial_map) { 939 struct dso *curr_map_dso = map__dso(curr_map); 940 941 rb_erase_cached(&pos->rb_node, root); 942 symbols__insert(&curr_map_dso->symbols, pos); 943 ++moved; 944 } else 945 ++count; 946 947 continue; 948 discard_symbol: 949 rb_erase_cached(&pos->rb_node, root); 950 symbol__delete(pos); 951 } 952 953 if (curr_map != initial_map && 954 dso->kernel == DSO_SPACE__KERNEL_GUEST && 955 machine__is_default_guest(maps__machine(kmaps))) { 956 dso__set_loaded(map__dso(curr_map)); 957 } 958 959 return count + moved; 960 } 961 962 bool symbol__restricted_filename(const char *filename, 963 const char *restricted_filename) 964 { 965 bool restricted = false; 966 967 if (symbol_conf.kptr_restrict) { 968 char *r = realpath(filename, NULL); 969 970 if (r != NULL) { 971 restricted = strcmp(r, restricted_filename) == 0; 972 free(r); 973 return restricted; 974 } 975 } 976 977 return restricted; 978 } 979 980 struct module_info { 981 struct rb_node rb_node; 982 char *name; 983 u64 start; 984 }; 985 986 static void add_module(struct module_info *mi, struct rb_root *modules) 987 { 988 struct rb_node **p = &modules->rb_node; 989 struct rb_node *parent = NULL; 990 struct module_info *m; 991 992 while (*p != NULL) { 993 parent = *p; 994 m = rb_entry(parent, struct module_info, rb_node); 995 if (strcmp(mi->name, m->name) < 0) 996 p = &(*p)->rb_left; 997 else 998 p = &(*p)->rb_right; 999 } 1000 rb_link_node(&mi->rb_node, parent, p); 1001 rb_insert_color(&mi->rb_node, modules); 1002 } 1003 1004 static void delete_modules(struct rb_root *modules) 1005 { 1006 struct module_info *mi; 1007 struct rb_node *next = rb_first(modules); 1008 1009 while (next) { 1010 mi = rb_entry(next, struct module_info, rb_node); 1011 next = rb_next(&mi->rb_node); 1012 rb_erase(&mi->rb_node, modules); 1013 zfree(&mi->name); 1014 free(mi); 1015 } 1016 } 1017 1018 static struct module_info *find_module(const char *name, 1019 struct rb_root *modules) 1020 { 1021 struct rb_node *n = modules->rb_node; 1022 1023 while (n) { 1024 struct module_info *m; 1025 int cmp; 1026 1027 m = rb_entry(n, struct module_info, rb_node); 1028 cmp = strcmp(name, m->name); 1029 if (cmp < 0) 1030 n = n->rb_left; 1031 else if (cmp > 0) 1032 n = n->rb_right; 1033 else 1034 return m; 1035 } 1036 1037 return NULL; 1038 } 1039 1040 static int __read_proc_modules(void *arg, const char *name, u64 start, 1041 u64 size __maybe_unused) 1042 { 1043 struct rb_root *modules = arg; 1044 struct module_info *mi; 1045 1046 mi = zalloc(sizeof(struct module_info)); 1047 if (!mi) 1048 return -ENOMEM; 1049 1050 mi->name = strdup(name); 1051 mi->start = start; 1052 1053 if (!mi->name) { 1054 free(mi); 1055 return -ENOMEM; 1056 } 1057 1058 add_module(mi, modules); 1059 1060 return 0; 1061 } 1062 1063 static int read_proc_modules(const char *filename, struct rb_root *modules) 1064 { 1065 if (symbol__restricted_filename(filename, "/proc/modules")) 1066 return -1; 1067 1068 if (modules__parse(filename, modules, __read_proc_modules)) { 1069 delete_modules(modules); 1070 return -1; 1071 } 1072 1073 return 0; 1074 } 1075 1076 int compare_proc_modules(const char *from, const char *to) 1077 { 1078 struct rb_root from_modules = RB_ROOT; 1079 struct rb_root to_modules = RB_ROOT; 1080 struct rb_node *from_node, *to_node; 1081 struct module_info *from_m, *to_m; 1082 int ret = -1; 1083 1084 if (read_proc_modules(from, &from_modules)) 1085 return -1; 1086 1087 if (read_proc_modules(to, &to_modules)) 1088 goto out_delete_from; 1089 1090 from_node = rb_first(&from_modules); 1091 to_node = rb_first(&to_modules); 1092 while (from_node) { 1093 if (!to_node) 1094 break; 1095 1096 from_m = rb_entry(from_node, struct module_info, rb_node); 1097 to_m = rb_entry(to_node, struct module_info, rb_node); 1098 1099 if (from_m->start != to_m->start || 1100 strcmp(from_m->name, to_m->name)) 1101 break; 1102 1103 from_node = rb_next(from_node); 1104 to_node = rb_next(to_node); 1105 } 1106 1107 if (!from_node && !to_node) 1108 ret = 0; 1109 1110 delete_modules(&to_modules); 1111 out_delete_from: 1112 delete_modules(&from_modules); 1113 1114 return ret; 1115 } 1116 1117 static int do_validate_kcore_modules_cb(struct map *old_map, void *data) 1118 { 1119 struct rb_root *modules = data; 1120 struct module_info *mi; 1121 struct dso *dso; 1122 1123 if (!__map__is_kmodule(old_map)) 1124 return 0; 1125 1126 dso = map__dso(old_map); 1127 /* Module must be in memory at the same address */ 1128 mi = find_module(dso->short_name, modules); 1129 if (!mi || mi->start != map__start(old_map)) 1130 return -EINVAL; 1131 1132 return 0; 1133 } 1134 1135 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps) 1136 { 1137 struct rb_root modules = RB_ROOT; 1138 int err; 1139 1140 err = read_proc_modules(filename, &modules); 1141 if (err) 1142 return err; 1143 1144 err = maps__for_each_map(kmaps, do_validate_kcore_modules_cb, &modules); 1145 1146 delete_modules(&modules); 1147 return err; 1148 } 1149 1150 /* 1151 * If kallsyms is referenced by name then we look for filename in the same 1152 * directory. 1153 */ 1154 static bool filename_from_kallsyms_filename(char *filename, 1155 const char *base_name, 1156 const char *kallsyms_filename) 1157 { 1158 char *name; 1159 1160 strcpy(filename, kallsyms_filename); 1161 name = strrchr(filename, '/'); 1162 if (!name) 1163 return false; 1164 1165 name += 1; 1166 1167 if (!strcmp(name, "kallsyms")) { 1168 strcpy(name, base_name); 1169 return true; 1170 } 1171 1172 return false; 1173 } 1174 1175 static int validate_kcore_modules(const char *kallsyms_filename, 1176 struct map *map) 1177 { 1178 struct maps *kmaps = map__kmaps(map); 1179 char modules_filename[PATH_MAX]; 1180 1181 if (!kmaps) 1182 return -EINVAL; 1183 1184 if (!filename_from_kallsyms_filename(modules_filename, "modules", 1185 kallsyms_filename)) 1186 return -EINVAL; 1187 1188 if (do_validate_kcore_modules(modules_filename, kmaps)) 1189 return -EINVAL; 1190 1191 return 0; 1192 } 1193 1194 static int validate_kcore_addresses(const char *kallsyms_filename, 1195 struct map *map) 1196 { 1197 struct kmap *kmap = map__kmap(map); 1198 1199 if (!kmap) 1200 return -EINVAL; 1201 1202 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) { 1203 u64 start; 1204 1205 if (kallsyms__get_function_start(kallsyms_filename, 1206 kmap->ref_reloc_sym->name, &start)) 1207 return -ENOENT; 1208 if (start != kmap->ref_reloc_sym->addr) 1209 return -EINVAL; 1210 } 1211 1212 return validate_kcore_modules(kallsyms_filename, map); 1213 } 1214 1215 struct kcore_mapfn_data { 1216 struct dso *dso; 1217 struct list_head maps; 1218 }; 1219 1220 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) 1221 { 1222 struct kcore_mapfn_data *md = data; 1223 struct map_list_node *list_node = map_list_node__new(); 1224 1225 if (!list_node) 1226 return -ENOMEM; 1227 1228 list_node->map = map__new2(start, md->dso); 1229 if (!list_node->map) { 1230 free(list_node); 1231 return -ENOMEM; 1232 } 1233 1234 map__set_end(list_node->map, map__start(list_node->map) + len); 1235 map__set_pgoff(list_node->map, pgoff); 1236 1237 list_add(&list_node->node, &md->maps); 1238 1239 return 0; 1240 } 1241 1242 static bool remove_old_maps(struct map *map, void *data) 1243 { 1244 const struct map *map_to_save = data; 1245 1246 /* 1247 * We need to preserve eBPF maps even if they are covered by kcore, 1248 * because we need to access eBPF dso for source data. 1249 */ 1250 return !RC_CHK_EQUAL(map, map_to_save) && !__map__is_bpf_prog(map); 1251 } 1252 1253 static int dso__load_kcore(struct dso *dso, struct map *map, 1254 const char *kallsyms_filename) 1255 { 1256 struct maps *kmaps = map__kmaps(map); 1257 struct kcore_mapfn_data md; 1258 struct map *replacement_map = NULL; 1259 struct machine *machine; 1260 bool is_64_bit; 1261 int err, fd; 1262 char kcore_filename[PATH_MAX]; 1263 u64 stext; 1264 1265 if (!kmaps) 1266 return -EINVAL; 1267 1268 machine = maps__machine(kmaps); 1269 1270 /* This function requires that the map is the kernel map */ 1271 if (!__map__is_kernel(map)) 1272 return -EINVAL; 1273 1274 if (!filename_from_kallsyms_filename(kcore_filename, "kcore", 1275 kallsyms_filename)) 1276 return -EINVAL; 1277 1278 /* Modules and kernel must be present at their original addresses */ 1279 if (validate_kcore_addresses(kallsyms_filename, map)) 1280 return -EINVAL; 1281 1282 md.dso = dso; 1283 INIT_LIST_HEAD(&md.maps); 1284 1285 fd = open(kcore_filename, O_RDONLY); 1286 if (fd < 0) { 1287 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n", 1288 kcore_filename); 1289 return -EINVAL; 1290 } 1291 1292 /* Read new maps into temporary lists */ 1293 err = file__read_maps(fd, map__prot(map) & PROT_EXEC, kcore_mapfn, &md, 1294 &is_64_bit); 1295 if (err) 1296 goto out_err; 1297 dso->is_64_bit = is_64_bit; 1298 1299 if (list_empty(&md.maps)) { 1300 err = -EINVAL; 1301 goto out_err; 1302 } 1303 1304 /* Remove old maps */ 1305 maps__remove_maps(kmaps, remove_old_maps, map); 1306 machine->trampolines_mapped = false; 1307 1308 /* Find the kernel map using the '_stext' symbol */ 1309 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) { 1310 u64 replacement_size = 0; 1311 struct map_list_node *new_node; 1312 1313 list_for_each_entry(new_node, &md.maps, node) { 1314 struct map *new_map = new_node->map; 1315 u64 new_size = map__size(new_map); 1316 1317 if (!(stext >= map__start(new_map) && stext < map__end(new_map))) 1318 continue; 1319 1320 /* 1321 * On some architectures, ARM64 for example, the kernel 1322 * text can get allocated inside of the vmalloc segment. 1323 * Select the smallest matching segment, in case stext 1324 * falls within more than one in the list. 1325 */ 1326 if (!replacement_map || new_size < replacement_size) { 1327 replacement_map = new_map; 1328 replacement_size = new_size; 1329 } 1330 } 1331 } 1332 1333 if (!replacement_map) 1334 replacement_map = list_entry(md.maps.next, struct map_list_node, node)->map; 1335 1336 /* Add new maps */ 1337 while (!list_empty(&md.maps)) { 1338 struct map_list_node *new_node = list_entry(md.maps.next, struct map_list_node, node); 1339 struct map *new_map = new_node->map; 1340 1341 list_del_init(&new_node->node); 1342 1343 if (RC_CHK_EQUAL(new_map, replacement_map)) { 1344 struct map *map_ref; 1345 1346 map__set_start(map, map__start(new_map)); 1347 map__set_end(map, map__end(new_map)); 1348 map__set_pgoff(map, map__pgoff(new_map)); 1349 map__set_mapping_type(map, map__mapping_type(new_map)); 1350 /* Ensure maps are correctly ordered */ 1351 map_ref = map__get(map); 1352 maps__remove(kmaps, map_ref); 1353 err = maps__insert(kmaps, map_ref); 1354 map__put(map_ref); 1355 map__put(new_map); 1356 if (err) 1357 goto out_err; 1358 } else { 1359 /* 1360 * Merge kcore map into existing maps, 1361 * and ensure that current maps (eBPF) 1362 * stay intact. 1363 */ 1364 if (maps__merge_in(kmaps, new_map)) { 1365 err = -EINVAL; 1366 goto out_err; 1367 } 1368 } 1369 free(new_node); 1370 } 1371 1372 if (machine__is(machine, "x86_64")) { 1373 u64 addr; 1374 1375 /* 1376 * If one of the corresponding symbols is there, assume the 1377 * entry trampoline maps are too. 1378 */ 1379 if (!kallsyms__get_function_start(kallsyms_filename, 1380 ENTRY_TRAMPOLINE_NAME, 1381 &addr)) 1382 machine->trampolines_mapped = true; 1383 } 1384 1385 /* 1386 * Set the data type and long name so that kcore can be read via 1387 * dso__data_read_addr(). 1388 */ 1389 if (dso->kernel == DSO_SPACE__KERNEL_GUEST) 1390 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE; 1391 else 1392 dso->binary_type = DSO_BINARY_TYPE__KCORE; 1393 dso__set_long_name(dso, strdup(kcore_filename), true); 1394 1395 close(fd); 1396 1397 if (map__prot(map) & PROT_EXEC) 1398 pr_debug("Using %s for kernel object code\n", kcore_filename); 1399 else 1400 pr_debug("Using %s for kernel data\n", kcore_filename); 1401 1402 return 0; 1403 1404 out_err: 1405 while (!list_empty(&md.maps)) { 1406 struct map_list_node *list_node; 1407 1408 list_node = list_entry(md.maps.next, struct map_list_node, node); 1409 list_del_init(&list_node->node); 1410 map__zput(list_node->map); 1411 free(list_node); 1412 } 1413 close(fd); 1414 return err; 1415 } 1416 1417 /* 1418 * If the kernel is relocated at boot time, kallsyms won't match. Compute the 1419 * delta based on the relocation reference symbol. 1420 */ 1421 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta) 1422 { 1423 u64 addr; 1424 1425 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) 1426 return 0; 1427 1428 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr)) 1429 return -1; 1430 1431 *delta = addr - kmap->ref_reloc_sym->addr; 1432 return 0; 1433 } 1434 1435 int __dso__load_kallsyms(struct dso *dso, const char *filename, 1436 struct map *map, bool no_kcore) 1437 { 1438 struct kmap *kmap = map__kmap(map); 1439 u64 delta = 0; 1440 1441 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 1442 return -1; 1443 1444 if (!kmap || !kmap->kmaps) 1445 return -1; 1446 1447 if (dso__load_all_kallsyms(dso, filename) < 0) 1448 return -1; 1449 1450 if (kallsyms__delta(kmap, filename, &delta)) 1451 return -1; 1452 1453 symbols__fixup_end(&dso->symbols, true); 1454 symbols__fixup_duplicate(&dso->symbols); 1455 1456 if (dso->kernel == DSO_SPACE__KERNEL_GUEST) 1457 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 1458 else 1459 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; 1460 1461 if (!no_kcore && !dso__load_kcore(dso, map, filename)) 1462 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso); 1463 else 1464 return maps__split_kallsyms(kmap->kmaps, dso, delta, map); 1465 } 1466 1467 int dso__load_kallsyms(struct dso *dso, const char *filename, 1468 struct map *map) 1469 { 1470 return __dso__load_kallsyms(dso, filename, map, false); 1471 } 1472 1473 static int dso__load_perf_map(const char *map_path, struct dso *dso) 1474 { 1475 char *line = NULL; 1476 size_t n; 1477 FILE *file; 1478 int nr_syms = 0; 1479 1480 file = fopen(map_path, "r"); 1481 if (file == NULL) 1482 goto out_failure; 1483 1484 while (!feof(file)) { 1485 u64 start, size; 1486 struct symbol *sym; 1487 int line_len, len; 1488 1489 line_len = getline(&line, &n, file); 1490 if (line_len < 0) 1491 break; 1492 1493 if (!line) 1494 goto out_failure; 1495 1496 line[--line_len] = '\0'; /* \n */ 1497 1498 len = hex2u64(line, &start); 1499 1500 len++; 1501 if (len + 2 >= line_len) 1502 continue; 1503 1504 len += hex2u64(line + len, &size); 1505 1506 len++; 1507 if (len + 2 >= line_len) 1508 continue; 1509 1510 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len); 1511 1512 if (sym == NULL) 1513 goto out_delete_line; 1514 1515 symbols__insert(&dso->symbols, sym); 1516 nr_syms++; 1517 } 1518 1519 free(line); 1520 fclose(file); 1521 1522 return nr_syms; 1523 1524 out_delete_line: 1525 free(line); 1526 out_failure: 1527 return -1; 1528 } 1529 1530 #ifdef HAVE_LIBBFD_SUPPORT 1531 #define PACKAGE 'perf' 1532 #include <bfd.h> 1533 1534 static int bfd_symbols__cmpvalue(const void *a, const void *b) 1535 { 1536 const asymbol *as = *(const asymbol **)a, *bs = *(const asymbol **)b; 1537 1538 if (bfd_asymbol_value(as) != bfd_asymbol_value(bs)) 1539 return bfd_asymbol_value(as) - bfd_asymbol_value(bs); 1540 1541 return bfd_asymbol_name(as)[0] - bfd_asymbol_name(bs)[0]; 1542 } 1543 1544 static int bfd2elf_binding(asymbol *symbol) 1545 { 1546 if (symbol->flags & BSF_WEAK) 1547 return STB_WEAK; 1548 if (symbol->flags & BSF_GLOBAL) 1549 return STB_GLOBAL; 1550 if (symbol->flags & BSF_LOCAL) 1551 return STB_LOCAL; 1552 return -1; 1553 } 1554 1555 int dso__load_bfd_symbols(struct dso *dso, const char *debugfile) 1556 { 1557 int err = -1; 1558 long symbols_size, symbols_count, i; 1559 asection *section; 1560 asymbol **symbols, *sym; 1561 struct symbol *symbol; 1562 bfd *abfd; 1563 u64 start, len; 1564 1565 abfd = bfd_openr(debugfile, NULL); 1566 if (!abfd) 1567 return -1; 1568 1569 if (!bfd_check_format(abfd, bfd_object)) { 1570 pr_debug2("%s: cannot read %s bfd file.\n", __func__, 1571 dso->long_name); 1572 goto out_close; 1573 } 1574 1575 if (bfd_get_flavour(abfd) == bfd_target_elf_flavour) 1576 goto out_close; 1577 1578 symbols_size = bfd_get_symtab_upper_bound(abfd); 1579 if (symbols_size == 0) { 1580 bfd_close(abfd); 1581 return 0; 1582 } 1583 1584 if (symbols_size < 0) 1585 goto out_close; 1586 1587 symbols = malloc(symbols_size); 1588 if (!symbols) 1589 goto out_close; 1590 1591 symbols_count = bfd_canonicalize_symtab(abfd, symbols); 1592 if (symbols_count < 0) 1593 goto out_free; 1594 1595 section = bfd_get_section_by_name(abfd, ".text"); 1596 if (section) { 1597 for (i = 0; i < symbols_count; ++i) { 1598 if (!strcmp(bfd_asymbol_name(symbols[i]), "__ImageBase") || 1599 !strcmp(bfd_asymbol_name(symbols[i]), "__image_base__")) 1600 break; 1601 } 1602 if (i < symbols_count) { 1603 /* PE symbols can only have 4 bytes, so use .text high bits */ 1604 dso->text_offset = section->vma - (u32)section->vma; 1605 dso->text_offset += (u32)bfd_asymbol_value(symbols[i]); 1606 dso->text_end = (section->vma - dso->text_offset) + section->size; 1607 } else { 1608 dso->text_offset = section->vma - section->filepos; 1609 dso->text_end = section->filepos + section->size; 1610 } 1611 } 1612 1613 qsort(symbols, symbols_count, sizeof(asymbol *), bfd_symbols__cmpvalue); 1614 1615 #ifdef bfd_get_section 1616 #define bfd_asymbol_section bfd_get_section 1617 #endif 1618 for (i = 0; i < symbols_count; ++i) { 1619 sym = symbols[i]; 1620 section = bfd_asymbol_section(sym); 1621 if (bfd2elf_binding(sym) < 0) 1622 continue; 1623 1624 while (i + 1 < symbols_count && 1625 bfd_asymbol_section(symbols[i + 1]) == section && 1626 bfd2elf_binding(symbols[i + 1]) < 0) 1627 i++; 1628 1629 if (i + 1 < symbols_count && 1630 bfd_asymbol_section(symbols[i + 1]) == section) 1631 len = symbols[i + 1]->value - sym->value; 1632 else 1633 len = section->size - sym->value; 1634 1635 start = bfd_asymbol_value(sym) - dso->text_offset; 1636 symbol = symbol__new(start, len, bfd2elf_binding(sym), STT_FUNC, 1637 bfd_asymbol_name(sym)); 1638 if (!symbol) 1639 goto out_free; 1640 1641 symbols__insert(&dso->symbols, symbol); 1642 } 1643 #ifdef bfd_get_section 1644 #undef bfd_asymbol_section 1645 #endif 1646 1647 symbols__fixup_end(&dso->symbols, false); 1648 symbols__fixup_duplicate(&dso->symbols); 1649 dso->adjust_symbols = 1; 1650 1651 err = 0; 1652 out_free: 1653 free(symbols); 1654 out_close: 1655 bfd_close(abfd); 1656 return err; 1657 } 1658 #endif 1659 1660 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, 1661 enum dso_binary_type type) 1662 { 1663 switch (type) { 1664 case DSO_BINARY_TYPE__JAVA_JIT: 1665 case DSO_BINARY_TYPE__DEBUGLINK: 1666 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO: 1667 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO: 1668 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO: 1669 case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO: 1670 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO: 1671 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: 1672 return !kmod && dso->kernel == DSO_SPACE__USER; 1673 1674 case DSO_BINARY_TYPE__KALLSYMS: 1675 case DSO_BINARY_TYPE__VMLINUX: 1676 case DSO_BINARY_TYPE__KCORE: 1677 return dso->kernel == DSO_SPACE__KERNEL; 1678 1679 case DSO_BINARY_TYPE__GUEST_KALLSYMS: 1680 case DSO_BINARY_TYPE__GUEST_VMLINUX: 1681 case DSO_BINARY_TYPE__GUEST_KCORE: 1682 return dso->kernel == DSO_SPACE__KERNEL_GUEST; 1683 1684 case DSO_BINARY_TYPE__GUEST_KMODULE: 1685 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP: 1686 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE: 1687 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP: 1688 /* 1689 * kernel modules know their symtab type - it's set when 1690 * creating a module dso in machine__addnew_module_map(). 1691 */ 1692 return kmod && dso->symtab_type == type; 1693 1694 case DSO_BINARY_TYPE__BUILD_ID_CACHE: 1695 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO: 1696 return true; 1697 1698 case DSO_BINARY_TYPE__BPF_PROG_INFO: 1699 case DSO_BINARY_TYPE__BPF_IMAGE: 1700 case DSO_BINARY_TYPE__OOL: 1701 case DSO_BINARY_TYPE__NOT_FOUND: 1702 default: 1703 return false; 1704 } 1705 } 1706 1707 /* Checks for the existence of the perf-<pid>.map file in two different 1708 * locations. First, if the process is a separate mount namespace, check in 1709 * that namespace using the pid of the innermost pid namespace. If's not in a 1710 * namespace, or the file can't be found there, try in the mount namespace of 1711 * the tracing process using our view of its pid. 1712 */ 1713 static int dso__find_perf_map(char *filebuf, size_t bufsz, 1714 struct nsinfo **nsip) 1715 { 1716 struct nscookie nsc; 1717 struct nsinfo *nsi; 1718 struct nsinfo *nnsi; 1719 int rc = -1; 1720 1721 nsi = *nsip; 1722 1723 if (nsinfo__need_setns(nsi)) { 1724 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__nstgid(nsi)); 1725 nsinfo__mountns_enter(nsi, &nsc); 1726 rc = access(filebuf, R_OK); 1727 nsinfo__mountns_exit(&nsc); 1728 if (rc == 0) 1729 return rc; 1730 } 1731 1732 nnsi = nsinfo__copy(nsi); 1733 if (nnsi) { 1734 nsinfo__put(nsi); 1735 1736 nsinfo__clear_need_setns(nnsi); 1737 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__tgid(nnsi)); 1738 *nsip = nnsi; 1739 rc = 0; 1740 } 1741 1742 return rc; 1743 } 1744 1745 int dso__load(struct dso *dso, struct map *map) 1746 { 1747 char *name; 1748 int ret = -1; 1749 u_int i; 1750 struct machine *machine = NULL; 1751 char *root_dir = (char *) ""; 1752 int ss_pos = 0; 1753 struct symsrc ss_[2]; 1754 struct symsrc *syms_ss = NULL, *runtime_ss = NULL; 1755 bool kmod; 1756 bool perfmap; 1757 struct build_id bid; 1758 struct nscookie nsc; 1759 char newmapname[PATH_MAX]; 1760 const char *map_path = dso->long_name; 1761 1762 mutex_lock(&dso->lock); 1763 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0; 1764 if (perfmap) { 1765 if (dso->nsinfo && (dso__find_perf_map(newmapname, 1766 sizeof(newmapname), &dso->nsinfo) == 0)) { 1767 map_path = newmapname; 1768 } 1769 } 1770 1771 nsinfo__mountns_enter(dso->nsinfo, &nsc); 1772 1773 /* check again under the dso->lock */ 1774 if (dso__loaded(dso)) { 1775 ret = 1; 1776 goto out; 1777 } 1778 1779 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || 1780 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP || 1781 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || 1782 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; 1783 1784 if (dso->kernel && !kmod) { 1785 if (dso->kernel == DSO_SPACE__KERNEL) 1786 ret = dso__load_kernel_sym(dso, map); 1787 else if (dso->kernel == DSO_SPACE__KERNEL_GUEST) 1788 ret = dso__load_guest_kernel_sym(dso, map); 1789 1790 machine = maps__machine(map__kmaps(map)); 1791 if (machine__is(machine, "x86_64")) 1792 machine__map_x86_64_entry_trampolines(machine, dso); 1793 goto out; 1794 } 1795 1796 dso->adjust_symbols = 0; 1797 1798 if (perfmap) { 1799 ret = dso__load_perf_map(map_path, dso); 1800 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : 1801 DSO_BINARY_TYPE__NOT_FOUND; 1802 goto out; 1803 } 1804 1805 if (machine) 1806 root_dir = machine->root_dir; 1807 1808 name = malloc(PATH_MAX); 1809 if (!name) 1810 goto out; 1811 1812 /* 1813 * Read the build id if possible. This is required for 1814 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work 1815 */ 1816 if (!dso->has_build_id && 1817 is_regular_file(dso->long_name)) { 1818 __symbol__join_symfs(name, PATH_MAX, dso->long_name); 1819 if (filename__read_build_id(name, &bid) > 0) 1820 dso__set_build_id(dso, &bid); 1821 } 1822 1823 /* 1824 * Iterate over candidate debug images. 1825 * Keep track of "interesting" ones (those which have a symtab, dynsym, 1826 * and/or opd section) for processing. 1827 */ 1828 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { 1829 struct symsrc *ss = &ss_[ss_pos]; 1830 bool next_slot = false; 1831 bool is_reg; 1832 bool nsexit; 1833 int bfdrc = -1; 1834 int sirc = -1; 1835 1836 enum dso_binary_type symtab_type = binary_type_symtab[i]; 1837 1838 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE || 1839 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO); 1840 1841 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type)) 1842 continue; 1843 1844 if (dso__read_binary_type_filename(dso, symtab_type, 1845 root_dir, name, PATH_MAX)) 1846 continue; 1847 1848 if (nsexit) 1849 nsinfo__mountns_exit(&nsc); 1850 1851 is_reg = is_regular_file(name); 1852 if (!is_reg && errno == ENOENT && dso->nsinfo) { 1853 char *new_name = dso__filename_with_chroot(dso, name); 1854 if (new_name) { 1855 is_reg = is_regular_file(new_name); 1856 strlcpy(name, new_name, PATH_MAX); 1857 free(new_name); 1858 } 1859 } 1860 1861 #ifdef HAVE_LIBBFD_SUPPORT 1862 if (is_reg) 1863 bfdrc = dso__load_bfd_symbols(dso, name); 1864 #endif 1865 if (is_reg && bfdrc < 0) 1866 sirc = symsrc__init(ss, dso, name, symtab_type); 1867 1868 if (nsexit) 1869 nsinfo__mountns_enter(dso->nsinfo, &nsc); 1870 1871 if (bfdrc == 0) { 1872 ret = 0; 1873 break; 1874 } 1875 1876 if (!is_reg || sirc < 0) 1877 continue; 1878 1879 if (!syms_ss && symsrc__has_symtab(ss)) { 1880 syms_ss = ss; 1881 next_slot = true; 1882 if (!dso->symsrc_filename) 1883 dso->symsrc_filename = strdup(name); 1884 } 1885 1886 if (!runtime_ss && symsrc__possibly_runtime(ss)) { 1887 runtime_ss = ss; 1888 next_slot = true; 1889 } 1890 1891 if (next_slot) { 1892 ss_pos++; 1893 1894 if (syms_ss && runtime_ss) 1895 break; 1896 } else { 1897 symsrc__destroy(ss); 1898 } 1899 1900 } 1901 1902 if (!runtime_ss && !syms_ss) 1903 goto out_free; 1904 1905 if (runtime_ss && !syms_ss) { 1906 syms_ss = runtime_ss; 1907 } 1908 1909 /* We'll have to hope for the best */ 1910 if (!runtime_ss && syms_ss) 1911 runtime_ss = syms_ss; 1912 1913 if (syms_ss) 1914 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod); 1915 else 1916 ret = -1; 1917 1918 if (ret > 0) { 1919 int nr_plt; 1920 1921 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss); 1922 if (nr_plt > 0) 1923 ret += nr_plt; 1924 } 1925 1926 for (; ss_pos > 0; ss_pos--) 1927 symsrc__destroy(&ss_[ss_pos - 1]); 1928 out_free: 1929 free(name); 1930 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) 1931 ret = 0; 1932 out: 1933 dso__set_loaded(dso); 1934 mutex_unlock(&dso->lock); 1935 nsinfo__mountns_exit(&nsc); 1936 1937 return ret; 1938 } 1939 1940 int dso__load_vmlinux(struct dso *dso, struct map *map, 1941 const char *vmlinux, bool vmlinux_allocated) 1942 { 1943 int err = -1; 1944 struct symsrc ss; 1945 char symfs_vmlinux[PATH_MAX]; 1946 enum dso_binary_type symtab_type; 1947 1948 if (vmlinux[0] == '/') 1949 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux); 1950 else 1951 symbol__join_symfs(symfs_vmlinux, vmlinux); 1952 1953 if (dso->kernel == DSO_SPACE__KERNEL_GUEST) 1954 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1955 else 1956 symtab_type = DSO_BINARY_TYPE__VMLINUX; 1957 1958 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) 1959 return -1; 1960 1961 /* 1962 * dso__load_sym() may copy 'dso' which will result in the copies having 1963 * an incorrect long name unless we set it here first. 1964 */ 1965 dso__set_long_name(dso, vmlinux, vmlinux_allocated); 1966 if (dso->kernel == DSO_SPACE__KERNEL_GUEST) 1967 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; 1968 else 1969 dso->binary_type = DSO_BINARY_TYPE__VMLINUX; 1970 1971 err = dso__load_sym(dso, map, &ss, &ss, 0); 1972 symsrc__destroy(&ss); 1973 1974 if (err > 0) { 1975 dso__set_loaded(dso); 1976 pr_debug("Using %s for symbols\n", symfs_vmlinux); 1977 } 1978 1979 return err; 1980 } 1981 1982 int dso__load_vmlinux_path(struct dso *dso, struct map *map) 1983 { 1984 int i, err = 0; 1985 char *filename = NULL; 1986 1987 pr_debug("Looking at the vmlinux_path (%d entries long)\n", 1988 vmlinux_path__nr_entries + 1); 1989 1990 for (i = 0; i < vmlinux_path__nr_entries; ++i) { 1991 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false); 1992 if (err > 0) 1993 goto out; 1994 } 1995 1996 if (!symbol_conf.ignore_vmlinux_buildid) 1997 filename = dso__build_id_filename(dso, NULL, 0, false); 1998 if (filename != NULL) { 1999 err = dso__load_vmlinux(dso, map, filename, true); 2000 if (err > 0) 2001 goto out; 2002 free(filename); 2003 } 2004 out: 2005 return err; 2006 } 2007 2008 static bool visible_dir_filter(const char *name, struct dirent *d) 2009 { 2010 if (d->d_type != DT_DIR) 2011 return false; 2012 return lsdir_no_dot_filter(name, d); 2013 } 2014 2015 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) 2016 { 2017 char kallsyms_filename[PATH_MAX]; 2018 int ret = -1; 2019 struct strlist *dirs; 2020 struct str_node *nd; 2021 2022 dirs = lsdir(dir, visible_dir_filter); 2023 if (!dirs) 2024 return -1; 2025 2026 strlist__for_each_entry(nd, dirs) { 2027 scnprintf(kallsyms_filename, sizeof(kallsyms_filename), 2028 "%s/%s/kallsyms", dir, nd->s); 2029 if (!validate_kcore_addresses(kallsyms_filename, map)) { 2030 strlcpy(dir, kallsyms_filename, dir_sz); 2031 ret = 0; 2032 break; 2033 } 2034 } 2035 2036 strlist__delete(dirs); 2037 2038 return ret; 2039 } 2040 2041 /* 2042 * Use open(O_RDONLY) to check readability directly instead of access(R_OK) 2043 * since access(R_OK) only checks with real UID/GID but open() use effective 2044 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO). 2045 */ 2046 static bool filename__readable(const char *file) 2047 { 2048 int fd = open(file, O_RDONLY); 2049 if (fd < 0) 2050 return false; 2051 close(fd); 2052 return true; 2053 } 2054 2055 static char *dso__find_kallsyms(struct dso *dso, struct map *map) 2056 { 2057 struct build_id bid; 2058 char sbuild_id[SBUILD_ID_SIZE]; 2059 bool is_host = false; 2060 char path[PATH_MAX]; 2061 2062 if (!dso->has_build_id) { 2063 /* 2064 * Last resort, if we don't have a build-id and couldn't find 2065 * any vmlinux file, try the running kernel kallsyms table. 2066 */ 2067 goto proc_kallsyms; 2068 } 2069 2070 if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0) 2071 is_host = dso__build_id_equal(dso, &bid); 2072 2073 /* Try a fast path for /proc/kallsyms if possible */ 2074 if (is_host) { 2075 /* 2076 * Do not check the build-id cache, unless we know we cannot use 2077 * /proc/kcore or module maps don't match to /proc/kallsyms. 2078 * To check readability of /proc/kcore, do not use access(R_OK) 2079 * since /proc/kcore requires CAP_SYS_RAWIO to read and access 2080 * can't check it. 2081 */ 2082 if (filename__readable("/proc/kcore") && 2083 !validate_kcore_addresses("/proc/kallsyms", map)) 2084 goto proc_kallsyms; 2085 } 2086 2087 build_id__sprintf(&dso->bid, sbuild_id); 2088 2089 /* Find kallsyms in build-id cache with kcore */ 2090 scnprintf(path, sizeof(path), "%s/%s/%s", 2091 buildid_dir, DSO__NAME_KCORE, sbuild_id); 2092 2093 if (!find_matching_kcore(map, path, sizeof(path))) 2094 return strdup(path); 2095 2096 /* Use current /proc/kallsyms if possible */ 2097 if (is_host) { 2098 proc_kallsyms: 2099 return strdup("/proc/kallsyms"); 2100 } 2101 2102 /* Finally, find a cache of kallsyms */ 2103 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) { 2104 pr_err("No kallsyms or vmlinux with build-id %s was found\n", 2105 sbuild_id); 2106 return NULL; 2107 } 2108 2109 return strdup(path); 2110 } 2111 2112 static int dso__load_kernel_sym(struct dso *dso, struct map *map) 2113 { 2114 int err; 2115 const char *kallsyms_filename = NULL; 2116 char *kallsyms_allocated_filename = NULL; 2117 char *filename = NULL; 2118 2119 /* 2120 * Step 1: if the user specified a kallsyms or vmlinux filename, use 2121 * it and only it, reporting errors to the user if it cannot be used. 2122 * 2123 * For instance, try to analyse an ARM perf.data file _without_ a 2124 * build-id, or if the user specifies the wrong path to the right 2125 * vmlinux file, obviously we can't fallback to another vmlinux (a 2126 * x86_86 one, on the machine where analysis is being performed, say), 2127 * or worse, /proc/kallsyms. 2128 * 2129 * If the specified file _has_ a build-id and there is a build-id 2130 * section in the perf.data file, we will still do the expected 2131 * validation in dso__load_vmlinux and will bail out if they don't 2132 * match. 2133 */ 2134 if (symbol_conf.kallsyms_name != NULL) { 2135 kallsyms_filename = symbol_conf.kallsyms_name; 2136 goto do_kallsyms; 2137 } 2138 2139 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) { 2140 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false); 2141 } 2142 2143 /* 2144 * Before checking on common vmlinux locations, check if it's 2145 * stored as standard build id binary (not kallsyms) under 2146 * .debug cache. 2147 */ 2148 if (!symbol_conf.ignore_vmlinux_buildid) 2149 filename = __dso__build_id_filename(dso, NULL, 0, false, false); 2150 if (filename != NULL) { 2151 err = dso__load_vmlinux(dso, map, filename, true); 2152 if (err > 0) 2153 return err; 2154 free(filename); 2155 } 2156 2157 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { 2158 err = dso__load_vmlinux_path(dso, map); 2159 if (err > 0) 2160 return err; 2161 } 2162 2163 /* do not try local files if a symfs was given */ 2164 if (symbol_conf.symfs[0] != 0) 2165 return -1; 2166 2167 kallsyms_allocated_filename = dso__find_kallsyms(dso, map); 2168 if (!kallsyms_allocated_filename) 2169 return -1; 2170 2171 kallsyms_filename = kallsyms_allocated_filename; 2172 2173 do_kallsyms: 2174 err = dso__load_kallsyms(dso, kallsyms_filename, map); 2175 if (err > 0) 2176 pr_debug("Using %s for symbols\n", kallsyms_filename); 2177 free(kallsyms_allocated_filename); 2178 2179 if (err > 0 && !dso__is_kcore(dso)) { 2180 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS; 2181 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false); 2182 map__fixup_start(map); 2183 map__fixup_end(map); 2184 } 2185 2186 return err; 2187 } 2188 2189 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map) 2190 { 2191 int err; 2192 const char *kallsyms_filename; 2193 struct machine *machine = maps__machine(map__kmaps(map)); 2194 char path[PATH_MAX]; 2195 2196 if (machine->kallsyms_filename) { 2197 kallsyms_filename = machine->kallsyms_filename; 2198 } else if (machine__is_default_guest(machine)) { 2199 /* 2200 * if the user specified a vmlinux filename, use it and only 2201 * it, reporting errors to the user if it cannot be used. 2202 * Or use file guest_kallsyms inputted by user on commandline 2203 */ 2204 if (symbol_conf.default_guest_vmlinux_name != NULL) { 2205 err = dso__load_vmlinux(dso, map, 2206 symbol_conf.default_guest_vmlinux_name, 2207 false); 2208 return err; 2209 } 2210 2211 kallsyms_filename = symbol_conf.default_guest_kallsyms; 2212 if (!kallsyms_filename) 2213 return -1; 2214 } else { 2215 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 2216 kallsyms_filename = path; 2217 } 2218 2219 err = dso__load_kallsyms(dso, kallsyms_filename, map); 2220 if (err > 0) 2221 pr_debug("Using %s for symbols\n", kallsyms_filename); 2222 if (err > 0 && !dso__is_kcore(dso)) { 2223 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; 2224 dso__set_long_name(dso, machine->mmap_name, false); 2225 map__fixup_start(map); 2226 map__fixup_end(map); 2227 } 2228 2229 return err; 2230 } 2231 2232 static void vmlinux_path__exit(void) 2233 { 2234 while (--vmlinux_path__nr_entries >= 0) 2235 zfree(&vmlinux_path[vmlinux_path__nr_entries]); 2236 vmlinux_path__nr_entries = 0; 2237 2238 zfree(&vmlinux_path); 2239 } 2240 2241 static const char * const vmlinux_paths[] = { 2242 "vmlinux", 2243 "/boot/vmlinux" 2244 }; 2245 2246 static const char * const vmlinux_paths_upd[] = { 2247 "/boot/vmlinux-%s", 2248 "/usr/lib/debug/boot/vmlinux-%s", 2249 "/lib/modules/%s/build/vmlinux", 2250 "/usr/lib/debug/lib/modules/%s/vmlinux", 2251 "/usr/lib/debug/boot/vmlinux-%s.debug" 2252 }; 2253 2254 static int vmlinux_path__add(const char *new_entry) 2255 { 2256 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry); 2257 if (vmlinux_path[vmlinux_path__nr_entries] == NULL) 2258 return -1; 2259 ++vmlinux_path__nr_entries; 2260 2261 return 0; 2262 } 2263 2264 static int vmlinux_path__init(struct perf_env *env) 2265 { 2266 struct utsname uts; 2267 char bf[PATH_MAX]; 2268 char *kernel_version; 2269 unsigned int i; 2270 2271 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) + 2272 ARRAY_SIZE(vmlinux_paths_upd))); 2273 if (vmlinux_path == NULL) 2274 return -1; 2275 2276 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++) 2277 if (vmlinux_path__add(vmlinux_paths[i]) < 0) 2278 goto out_fail; 2279 2280 /* only try kernel version if no symfs was given */ 2281 if (symbol_conf.symfs[0] != 0) 2282 return 0; 2283 2284 if (env) { 2285 kernel_version = env->os_release; 2286 } else { 2287 if (uname(&uts) < 0) 2288 goto out_fail; 2289 2290 kernel_version = uts.release; 2291 } 2292 2293 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) { 2294 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version); 2295 if (vmlinux_path__add(bf) < 0) 2296 goto out_fail; 2297 } 2298 2299 return 0; 2300 2301 out_fail: 2302 vmlinux_path__exit(); 2303 return -1; 2304 } 2305 2306 int setup_list(struct strlist **list, const char *list_str, 2307 const char *list_name) 2308 { 2309 if (list_str == NULL) 2310 return 0; 2311 2312 *list = strlist__new(list_str, NULL); 2313 if (!*list) { 2314 pr_err("problems parsing %s list\n", list_name); 2315 return -1; 2316 } 2317 2318 symbol_conf.has_filter = true; 2319 return 0; 2320 } 2321 2322 int setup_intlist(struct intlist **list, const char *list_str, 2323 const char *list_name) 2324 { 2325 if (list_str == NULL) 2326 return 0; 2327 2328 *list = intlist__new(list_str); 2329 if (!*list) { 2330 pr_err("problems parsing %s list\n", list_name); 2331 return -1; 2332 } 2333 return 0; 2334 } 2335 2336 static int setup_addrlist(struct intlist **addr_list, struct strlist *sym_list) 2337 { 2338 struct str_node *pos, *tmp; 2339 unsigned long val; 2340 char *sep; 2341 const char *end; 2342 int i = 0, err; 2343 2344 *addr_list = intlist__new(NULL); 2345 if (!*addr_list) 2346 return -1; 2347 2348 strlist__for_each_entry_safe(pos, tmp, sym_list) { 2349 errno = 0; 2350 val = strtoul(pos->s, &sep, 16); 2351 if (errno || (sep == pos->s)) 2352 continue; 2353 2354 if (*sep != '\0') { 2355 end = pos->s + strlen(pos->s) - 1; 2356 while (end >= sep && isspace(*end)) 2357 end--; 2358 2359 if (end >= sep) 2360 continue; 2361 } 2362 2363 err = intlist__add(*addr_list, val); 2364 if (err) 2365 break; 2366 2367 strlist__remove(sym_list, pos); 2368 i++; 2369 } 2370 2371 if (i == 0) { 2372 intlist__delete(*addr_list); 2373 *addr_list = NULL; 2374 } 2375 2376 return 0; 2377 } 2378 2379 static bool symbol__read_kptr_restrict(void) 2380 { 2381 bool value = false; 2382 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); 2383 2384 if (fp != NULL) { 2385 char line[8]; 2386 2387 if (fgets(line, sizeof(line), fp) != NULL) 2388 value = perf_cap__capable(CAP_SYSLOG) ? 2389 (atoi(line) >= 2) : 2390 (atoi(line) != 0); 2391 2392 fclose(fp); 2393 } 2394 2395 /* Per kernel/kallsyms.c: 2396 * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG 2397 */ 2398 if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG)) 2399 value = true; 2400 2401 return value; 2402 } 2403 2404 int symbol__annotation_init(void) 2405 { 2406 if (symbol_conf.init_annotation) 2407 return 0; 2408 2409 if (symbol_conf.initialized) { 2410 pr_err("Annotation needs to be init before symbol__init()\n"); 2411 return -1; 2412 } 2413 2414 symbol_conf.priv_size += sizeof(struct annotation); 2415 symbol_conf.init_annotation = true; 2416 return 0; 2417 } 2418 2419 int symbol__init(struct perf_env *env) 2420 { 2421 const char *symfs; 2422 2423 if (symbol_conf.initialized) 2424 return 0; 2425 2426 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); 2427 2428 symbol__elf_init(); 2429 2430 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0) 2431 return -1; 2432 2433 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { 2434 pr_err("'.' is the only non valid --field-separator argument\n"); 2435 return -1; 2436 } 2437 2438 if (setup_list(&symbol_conf.dso_list, 2439 symbol_conf.dso_list_str, "dso") < 0) 2440 return -1; 2441 2442 if (setup_list(&symbol_conf.comm_list, 2443 symbol_conf.comm_list_str, "comm") < 0) 2444 goto out_free_dso_list; 2445 2446 if (setup_intlist(&symbol_conf.pid_list, 2447 symbol_conf.pid_list_str, "pid") < 0) 2448 goto out_free_comm_list; 2449 2450 if (setup_intlist(&symbol_conf.tid_list, 2451 symbol_conf.tid_list_str, "tid") < 0) 2452 goto out_free_pid_list; 2453 2454 if (setup_list(&symbol_conf.sym_list, 2455 symbol_conf.sym_list_str, "symbol") < 0) 2456 goto out_free_tid_list; 2457 2458 if (symbol_conf.sym_list && 2459 setup_addrlist(&symbol_conf.addr_list, symbol_conf.sym_list) < 0) 2460 goto out_free_sym_list; 2461 2462 if (setup_list(&symbol_conf.bt_stop_list, 2463 symbol_conf.bt_stop_list_str, "symbol") < 0) 2464 goto out_free_sym_list; 2465 2466 /* 2467 * A path to symbols of "/" is identical to "" 2468 * reset here for simplicity. 2469 */ 2470 symfs = realpath(symbol_conf.symfs, NULL); 2471 if (symfs == NULL) 2472 symfs = symbol_conf.symfs; 2473 if (strcmp(symfs, "/") == 0) 2474 symbol_conf.symfs = ""; 2475 if (symfs != symbol_conf.symfs) 2476 free((void *)symfs); 2477 2478 symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); 2479 2480 symbol_conf.initialized = true; 2481 return 0; 2482 2483 out_free_sym_list: 2484 strlist__delete(symbol_conf.sym_list); 2485 intlist__delete(symbol_conf.addr_list); 2486 out_free_tid_list: 2487 intlist__delete(symbol_conf.tid_list); 2488 out_free_pid_list: 2489 intlist__delete(symbol_conf.pid_list); 2490 out_free_comm_list: 2491 strlist__delete(symbol_conf.comm_list); 2492 out_free_dso_list: 2493 strlist__delete(symbol_conf.dso_list); 2494 return -1; 2495 } 2496 2497 void symbol__exit(void) 2498 { 2499 if (!symbol_conf.initialized) 2500 return; 2501 strlist__delete(symbol_conf.bt_stop_list); 2502 strlist__delete(symbol_conf.sym_list); 2503 strlist__delete(symbol_conf.dso_list); 2504 strlist__delete(symbol_conf.comm_list); 2505 intlist__delete(symbol_conf.tid_list); 2506 intlist__delete(symbol_conf.pid_list); 2507 intlist__delete(symbol_conf.addr_list); 2508 vmlinux_path__exit(); 2509 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; 2510 symbol_conf.bt_stop_list = NULL; 2511 symbol_conf.initialized = false; 2512 } 2513 2514 int symbol__config_symfs(const struct option *opt __maybe_unused, 2515 const char *dir, int unset __maybe_unused) 2516 { 2517 char *bf = NULL; 2518 int ret; 2519 2520 symbol_conf.symfs = strdup(dir); 2521 if (symbol_conf.symfs == NULL) 2522 return -ENOMEM; 2523 2524 /* skip the locally configured cache if a symfs is given, and 2525 * config buildid dir to symfs/.debug 2526 */ 2527 ret = asprintf(&bf, "%s/%s", dir, ".debug"); 2528 if (ret < 0) 2529 return -ENOMEM; 2530 2531 set_buildid_dir(bf); 2532 2533 free(bf); 2534 return 0; 2535 } 2536 2537 struct mem_info *mem_info__get(struct mem_info *mi) 2538 { 2539 if (mi) 2540 refcount_inc(&mi->refcnt); 2541 return mi; 2542 } 2543 2544 void mem_info__put(struct mem_info *mi) 2545 { 2546 if (mi && refcount_dec_and_test(&mi->refcnt)) { 2547 addr_map_symbol__exit(&mi->iaddr); 2548 addr_map_symbol__exit(&mi->daddr); 2549 free(mi); 2550 } 2551 } 2552 2553 struct mem_info *mem_info__new(void) 2554 { 2555 struct mem_info *mi = zalloc(sizeof(*mi)); 2556 2557 if (mi) 2558 refcount_set(&mi->refcnt, 1); 2559 return mi; 2560 } 2561 2562 /* 2563 * Checks that user supplied symbol kernel files are accessible because 2564 * the default mechanism for accessing elf files fails silently. i.e. if 2565 * debug syms for a build ID aren't found perf carries on normally. When 2566 * they are user supplied we should assume that the user doesn't want to 2567 * silently fail. 2568 */ 2569 int symbol__validate_sym_arguments(void) 2570 { 2571 if (symbol_conf.vmlinux_name && 2572 access(symbol_conf.vmlinux_name, R_OK)) { 2573 pr_err("Invalid file: %s\n", symbol_conf.vmlinux_name); 2574 return -EINVAL; 2575 } 2576 if (symbol_conf.kallsyms_name && 2577 access(symbol_conf.kallsyms_name, R_OK)) { 2578 pr_err("Invalid file: %s\n", symbol_conf.kallsyms_name); 2579 return -EINVAL; 2580 } 2581 return 0; 2582 } 2583