tools/perf/util/symbol.c

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