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