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