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