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