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