SAFE public projects git trees. - safe/jmp/linux-2.6/blob - tools/perf/util/symbol.c

   1 #include "util.h"
   2 #include "../perf.h"
   3 #include "string.h"
   4 #include "symbol.h"
   5 #include "thread.h"
   6
   7 #include "debug.h"
   8
   9 #include <libelf.h>
  10 #include <gelf.h>
  11 #include <elf.h>
  12 #include <limits.h>
  13 #include <sys/utsname.h>
  14
  15 enum dso_origin {
  16         DSO__ORIG_KERNEL = 0,
  17         DSO__ORIG_JAVA_JIT,
  18         DSO__ORIG_FEDORA,
  19         DSO__ORIG_UBUNTU,
  20         DSO__ORIG_BUILDID,
  21         DSO__ORIG_DSO,
  22         DSO__ORIG_KMODULE,
  23         DSO__ORIG_NOT_FOUND,
  24 };
  25
  26 static void dsos__add(struct dso *dso);
  27 static struct dso *dsos__find(const char *name);
  28 static struct map *map__new2(u64 start, struct dso *dso);
  29 static void kernel_maps__insert(struct map *map);
  30 unsigned int symbol__priv_size;
  31
  32 static struct rb_root kernel_maps;
  33
  34 static void dso__fixup_sym_end(struct dso *self)
  35 {
  36         struct rb_node *nd, *prevnd = rb_first(&self->syms);
  37         struct symbol *curr, *prev;
  38
  39         if (prevnd == NULL)
  40                 return;
  41
  42         curr = rb_entry(prevnd, struct symbol, rb_node);
  43
  44         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  45                 prev = curr;
  46                 curr = rb_entry(nd, struct symbol, rb_node);
  47
  48                 if (prev->end == prev->start)
  49                         prev->end = curr->start - 1;
  50         }
  51
  52         /* Last entry */
  53         if (curr->end == curr->start)
  54                 curr->end = roundup(curr->start, 4096);
  55 }
  56
  57 static void kernel_maps__fixup_end(void)
  58 {
  59         struct map *prev, *curr;
  60         struct rb_node *nd, *prevnd = rb_first(&kernel_maps);
  61
  62         if (prevnd == NULL)
  63                 return;
  64
  65         curr = rb_entry(prevnd, struct map, rb_node);
  66
  67         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  68                 prev = curr;
  69                 curr = rb_entry(nd, struct map, rb_node);
  70                 prev->end = curr->start - 1;
  71         }
  72
  73         nd = rb_last(&curr->dso->syms);
  74         if (nd) {
  75                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
  76                 curr->end = sym->end;
  77         }
  78 }
  79
  80 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
  81 {
  82         size_t namelen = strlen(name) + 1;
  83         struct symbol *self = calloc(1, (symbol__priv_size +
  84                                          sizeof(*self) + namelen));
  85         if (!self)
  86                 return NULL;
  87
  88         if (symbol__priv_size) {
  89                 memset(self, 0, symbol__priv_size);
  90                 self = ((void *)self) + symbol__priv_size;
  91         }
  92         self->start = start;
  93         self->end   = len ? start + len - 1 : start;
  94
  95         pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
  96
  97         memcpy(self->name, name, namelen);
  98
  99         return self;
 100 }
 101
 102 static void symbol__delete(struct symbol *self)
 103 {
 104         free(((void *)self) - symbol__priv_size);
 105 }
 106
 107 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 108 {
 109         return fprintf(fp, " %llx-%llx %s\n",
 110                        self->start, self->end, self->name);
 111 }
 112
 113 static void dso__set_long_name(struct dso *self, char *name)
 114 {
 115         self->long_name = name;
 116         self->long_name_len = strlen(name);
 117 }
 118
 119 static void dso__set_basename(struct dso *self)
 120 {
 121         self->short_name = basename(self->long_name);
 122 }
 123
 124 struct dso *dso__new(const char *name)
 125 {
 126         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 127
 128         if (self != NULL) {
 129                 strcpy(self->name, name);
 130                 dso__set_long_name(self, self->name);
 131                 self->short_name = self->name;
 132                 self->syms = RB_ROOT;
 133                 self->find_symbol = dso__find_symbol;
 134                 self->slen_calculated = 0;
 135                 self->origin = DSO__ORIG_NOT_FOUND;
 136                 self->loaded = 0;
 137                 self->has_build_id = 0;
 138         }
 139
 140         return self;
 141 }
 142
 143 static void dso__delete_symbols(struct dso *self)
 144 {
 145         struct symbol *pos;
 146         struct rb_node *next = rb_first(&self->syms);
 147
 148         while (next) {
 149                 pos = rb_entry(next, struct symbol, rb_node);
 150                 next = rb_next(&pos->rb_node);
 151                 rb_erase(&pos->rb_node, &self->syms);
 152                 symbol__delete(pos);
 153         }
 154 }
 155
 156 void dso__delete(struct dso *self)
 157 {
 158         dso__delete_symbols(self);
 159         if (self->long_name != self->name)
 160                 free(self->long_name);
 161         free(self);
 162 }
 163
 164 void dso__set_build_id(struct dso *self, void *build_id)
 165 {
 166         memcpy(self->build_id, build_id, sizeof(self->build_id));
 167         self->has_build_id = 1;
 168 }
 169
 170 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
 171 {
 172         struct rb_node **p = &self->syms.rb_node;
 173         struct rb_node *parent = NULL;
 174         const u64 ip = sym->start;
 175         struct symbol *s;
 176
 177         while (*p != NULL) {
 178                 parent = *p;
 179                 s = rb_entry(parent, struct symbol, rb_node);
 180                 if (ip < s->start)
 181                         p = &(*p)->rb_left;
 182                 else
 183                         p = &(*p)->rb_right;
 184         }
 185         rb_link_node(&sym->rb_node, parent, p);
 186         rb_insert_color(&sym->rb_node, &self->syms);
 187 }
 188
 189 struct symbol *dso__find_symbol(struct dso *self, u64 ip)
 190 {
 191         struct rb_node *n;
 192
 193         if (self == NULL)
 194                 return NULL;
 195
 196         n = self->syms.rb_node;
 197
 198         while (n) {
 199                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 200
 201                 if (ip < s->start)
 202                         n = n->rb_left;
 203                 else if (ip > s->end)
 204                         n = n->rb_right;
 205                 else
 206                         return s;
 207         }
 208
 209         return NULL;
 210 }
 211
 212 int build_id__sprintf(u8 *self, int len, char *bf)
 213 {
 214         char *bid = bf;
 215         u8 *raw = self;
 216         int i;
 217
 218         for (i = 0; i < len; ++i) {
 219                 sprintf(bid, "%02x", *raw);
 220                 ++raw;
 221                 bid += 2;
 222         }
 223
 224         return raw - self;
 225 }
 226
 227 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 228 {
 229         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 230
 231         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 232         return fprintf(fp, "%s", sbuild_id);
 233 }
 234
 235 size_t dso__fprintf(struct dso *self, FILE *fp)
 236 {
 237         struct rb_node *nd;
 238         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 239
 240         ret += dso__fprintf_buildid(self, fp);
 241         ret += fprintf(fp, ")\n");
 242
 243         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
 244                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 245                 ret += symbol__fprintf(pos, fp);
 246         }
 247
 248         return ret;
 249 }
 250
 251 /*
 252  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 253  * so that we can in the next step set the symbol ->end address and then
 254  * call kernel_maps__split_kallsyms.
 255  */
 256 static int kernel_maps__load_all_kallsyms(void)
 257 {
 258         char *line = NULL;
 259         size_t n;
 260         FILE *file = fopen("/proc/kallsyms", "r");
 261
 262         if (file == NULL)
 263                 goto out_failure;
 264
 265         while (!feof(file)) {
 266                 u64 start;
 267                 struct symbol *sym;
 268                 int line_len, len;
 269                 char symbol_type;
 270                 char *symbol_name;
 271
 272                 line_len = getline(&line, &n, file);
 273                 if (line_len < 0)
 274                         break;
 275
 276                 if (!line)
 277                         goto out_failure;
 278
 279                 line[--line_len] = '\0'; /* \n */
 280
 281                 len = hex2u64(line, &start);
 282
 283                 len++;
 284                 if (len + 2 >= line_len)
 285                         continue;
 286
 287                 symbol_type = toupper(line[len]);
 288                 /*
 289                  * We're interested only in code ('T'ext)
 290                  */
 291                 if (symbol_type != 'T' && symbol_type != 'W')
 292                         continue;
 293
 294                 symbol_name = line + len + 2;
 295                 /*
 296                  * Will fix up the end later, when we have all symbols sorted.
 297                  */
 298                 sym = symbol__new(start, 0, symbol_name);
 299
 300                 if (sym == NULL)
 301                         goto out_delete_line;
 302
 303                 /*
 304                  * We will pass the symbols to the filter later, in
 305                  * kernel_maps__split_kallsyms, when we have split the
 306                  * maps per module
 307                  */
 308                 dso__insert_symbol(kernel_map->dso, sym);
 309         }
 310
 311         free(line);
 312         fclose(file);
 313
 314         return 0;
 315
 316 out_delete_line:
 317         free(line);
 318 out_failure:
 319         return -1;
 320 }
 321
 322 /*
 323  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 324  * kernel range is broken in several maps, named [kernel].N, as we don't have
 325  * the original ELF section names vmlinux have.
 326  */
 327 static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
 328 {
 329         struct map *map = kernel_map;
 330         struct symbol *pos;
 331         int count = 0;
 332         struct rb_node *next = rb_first(&kernel_map->dso->syms);
 333         int kernel_range = 0;
 334
 335         while (next) {
 336                 char *module;
 337
 338                 pos = rb_entry(next, struct symbol, rb_node);
 339                 next = rb_next(&pos->rb_node);
 340
 341                 module = strchr(pos->name, '\t');
 342                 if (module) {
 343                         if (!use_modules)
 344                                 goto delete_symbol;
 345
 346                         *module++ = '\0';
 347
 348                         if (strcmp(map->dso->name, module)) {
 349                                 map = kernel_maps__find_by_dso_name(module);
 350                                 if (!map) {
 351                                         pr_err("/proc/{kallsyms,modules} "
 352                                                "inconsistency!\n");
 353                                         return -1;
 354                                 }
 355                         }
 356                         /*
 357                          * So that we look just like we get from .ko files,
 358                          * i.e. not prelinked, relative to map->start.
 359                          */
 360                         pos->start = map->map_ip(map, pos->start);
 361                         pos->end   = map->map_ip(map, pos->end);
 362                 } else if (map != kernel_map) {
 363                         char dso_name[PATH_MAX];
 364                         struct dso *dso;
 365
 366                         snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
 367                                  kernel_range++);
 368
 369                         dso = dso__new(dso_name);
 370                         if (dso == NULL)
 371                                 return -1;
 372
 373                         map = map__new2(pos->start, dso);
 374                         if (map == NULL) {
 375                                 dso__delete(dso);
 376                                 return -1;
 377                         }
 378
 379                         map->map_ip = map->unmap_ip = identity__map_ip;
 380                         kernel_maps__insert(map);
 381                         ++kernel_range;
 382                 }
 383
 384                 if (filter && filter(map, pos)) {
 385 delete_symbol:
 386                         rb_erase(&pos->rb_node, &kernel_map->dso->syms);
 387                         symbol__delete(pos);
 388                 } else {
 389                         if (map != kernel_map) {
 390                                 rb_erase(&pos->rb_node, &kernel_map->dso->syms);
 391                                 dso__insert_symbol(map->dso, pos);
 392                         }
 393                         count++;
 394                 }
 395         }
 396
 397         return count;
 398 }
 399
 400
 401 static int kernel_maps__load_kallsyms(symbol_filter_t filter, int use_modules)
 402 {
 403         if (kernel_maps__load_all_kallsyms())
 404                 return -1;
 405
 406         dso__fixup_sym_end(kernel_map->dso);
 407
 408         return kernel_maps__split_kallsyms(filter, use_modules);
 409 }
 410
 411 static size_t kernel_maps__fprintf(FILE *fp)
 412 {
 413         size_t printed = fprintf(fp, "Kernel maps:\n");
 414         struct rb_node *nd;
 415
 416         for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) {
 417                 struct map *pos = rb_entry(nd, struct map, rb_node);
 418
 419                 printed += fprintf(fp, "Map:");
 420                 printed += map__fprintf(pos, fp);
 421                 if (verbose > 1) {
 422                         printed += dso__fprintf(pos->dso, fp);
 423                         printed += fprintf(fp, "--\n");
 424                 }
 425         }
 426
 427         return printed + fprintf(fp, "END kernel maps\n");
 428 }
 429
 430 static int dso__load_perf_map(struct dso *self, struct map *map,
 431                               symbol_filter_t filter)
 432 {
 433         char *line = NULL;
 434         size_t n;
 435         FILE *file;
 436         int nr_syms = 0;
 437
 438         file = fopen(self->long_name, "r");
 439         if (file == NULL)
 440                 goto out_failure;
 441
 442         while (!feof(file)) {
 443                 u64 start, size;
 444                 struct symbol *sym;
 445                 int line_len, len;
 446
 447                 line_len = getline(&line, &n, file);
 448                 if (line_len < 0)
 449                         break;
 450
 451                 if (!line)
 452                         goto out_failure;
 453
 454                 line[--line_len] = '\0'; /* \n */
 455
 456                 len = hex2u64(line, &start);
 457
 458                 len++;
 459                 if (len + 2 >= line_len)
 460                         continue;
 461
 462                 len += hex2u64(line + len, &size);
 463
 464                 len++;
 465                 if (len + 2 >= line_len)
 466                         continue;
 467
 468                 sym = symbol__new(start, size, line + len);
 469
 470                 if (sym == NULL)
 471                         goto out_delete_line;
 472
 473                 if (filter && filter(map, sym))
 474                         symbol__delete(sym);
 475                 else {
 476                         dso__insert_symbol(self, sym);
 477                         nr_syms++;
 478                 }
 479         }
 480
 481         free(line);
 482         fclose(file);
 483
 484         return nr_syms;
 485
 486 out_delete_line:
 487         free(line);
 488 out_failure:
 489         return -1;
 490 }
 491
 492 /**
 493  * elf_symtab__for_each_symbol - iterate thru all the symbols
 494  *
 495  * @self: struct elf_symtab instance to iterate
 496  * @idx: uint32_t idx
 497  * @sym: GElf_Sym iterator
 498  */
 499 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 500         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 501              idx < nr_syms; \
 502              idx++, gelf_getsym(syms, idx, &sym))
 503
 504 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 505 {
 506         return GELF_ST_TYPE(sym->st_info);
 507 }
 508
 509 static inline int elf_sym__is_function(const GElf_Sym *sym)
 510 {
 511         return elf_sym__type(sym) == STT_FUNC &&
 512                sym->st_name != 0 &&
 513                sym->st_shndx != SHN_UNDEF;
 514 }
 515
 516 static inline int elf_sym__is_label(const GElf_Sym *sym)
 517 {
 518         return elf_sym__type(sym) == STT_NOTYPE &&
 519                 sym->st_name != 0 &&
 520                 sym->st_shndx != SHN_UNDEF &&
 521                 sym->st_shndx != SHN_ABS;
 522 }
 523
 524 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 525                                         const Elf_Data *secstrs)
 526 {
 527         return secstrs->d_buf + shdr->sh_name;
 528 }
 529
 530 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 531                                         const Elf_Data *secstrs)
 532 {
 533         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 534 }
 535
 536 static inline const char *elf_sym__name(const GElf_Sym *sym,
 537                                         const Elf_Data *symstrs)
 538 {
 539         return symstrs->d_buf + sym->st_name;
 540 }
 541
 542 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 543                                     GElf_Shdr *shp, const char *name,
 544                                     size_t *idx)
 545 {
 546         Elf_Scn *sec = NULL;
 547         size_t cnt = 1;
 548
 549         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 550                 char *str;
 551
 552                 gelf_getshdr(sec, shp);
 553                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 554                 if (!strcmp(name, str)) {
 555                         if (idx)
 556                                 *idx = cnt;
 557                         break;
 558                 }
 559                 ++cnt;
 560         }
 561
 562         return sec;
 563 }
 564
 565 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 566         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 567              idx < nr_entries; \
 568              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 569
 570 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 571         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 572              idx < nr_entries; \
 573              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 574
 575 /*
 576  * We need to check if we have a .dynsym, so that we can handle the
 577  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 578  * .dynsym or .symtab).
 579  * And always look at the original dso, not at debuginfo packages, that
 580  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 581  */
 582 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 583                                        symbol_filter_t filter)
 584 {
 585         uint32_t nr_rel_entries, idx;
 586         GElf_Sym sym;
 587         u64 plt_offset;
 588         GElf_Shdr shdr_plt;
 589         struct symbol *f;
 590         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 591         Elf_Data *reldata, *syms, *symstrs;
 592         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 593         size_t dynsym_idx;
 594         GElf_Ehdr ehdr;
 595         char sympltname[1024];
 596         Elf *elf;
 597         int nr = 0, symidx, fd, err = 0;
 598
 599         fd = open(self->long_name, O_RDONLY);
 600         if (fd < 0)
 601                 goto out;
 602
 603         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 604         if (elf == NULL)
 605                 goto out_close;
 606
 607         if (gelf_getehdr(elf, &ehdr) == NULL)
 608                 goto out_elf_end;
 609
 610         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 611                                          ".dynsym", &dynsym_idx);
 612         if (scn_dynsym == NULL)
 613                 goto out_elf_end;
 614
 615         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 616                                           ".rela.plt", NULL);
 617         if (scn_plt_rel == NULL) {
 618                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 619                                                   ".rel.plt", NULL);
 620                 if (scn_plt_rel == NULL)
 621                         goto out_elf_end;
 622         }
 623
 624         err = -1;
 625
 626         if (shdr_rel_plt.sh_link != dynsym_idx)
 627                 goto out_elf_end;
 628
 629         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 630                 goto out_elf_end;
 631
 632         /*
 633          * Fetch the relocation section to find the idxes to the GOT
 634          * and the symbols in the .dynsym they refer to.
 635          */
 636         reldata = elf_getdata(scn_plt_rel, NULL);
 637         if (reldata == NULL)
 638                 goto out_elf_end;
 639
 640         syms = elf_getdata(scn_dynsym, NULL);
 641         if (syms == NULL)
 642                 goto out_elf_end;
 643
 644         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 645         if (scn_symstrs == NULL)
 646                 goto out_elf_end;
 647
 648         symstrs = elf_getdata(scn_symstrs, NULL);
 649         if (symstrs == NULL)
 650                 goto out_elf_end;
 651
 652         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 653         plt_offset = shdr_plt.sh_offset;
 654
 655         if (shdr_rel_plt.sh_type == SHT_RELA) {
 656                 GElf_Rela pos_mem, *pos;
 657
 658                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 659                                            nr_rel_entries) {
 660                         symidx = GELF_R_SYM(pos->r_info);
 661                         plt_offset += shdr_plt.sh_entsize;
 662                         gelf_getsym(syms, symidx, &sym);
 663                         snprintf(sympltname, sizeof(sympltname),
 664                                  "%s@plt", elf_sym__name(&sym, symstrs));
 665
 666                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 667                                         sympltname);
 668                         if (!f)
 669                                 goto out_elf_end;
 670
 671                         if (filter && filter(map, f))
 672                                 symbol__delete(f);
 673                         else {
 674                                 dso__insert_symbol(self, f);
 675                                 ++nr;
 676                         }
 677                 }
 678         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 679                 GElf_Rel pos_mem, *pos;
 680                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 681                                           nr_rel_entries) {
 682                         symidx = GELF_R_SYM(pos->r_info);
 683                         plt_offset += shdr_plt.sh_entsize;
 684                         gelf_getsym(syms, symidx, &sym);
 685                         snprintf(sympltname, sizeof(sympltname),
 686                                  "%s@plt", elf_sym__name(&sym, symstrs));
 687
 688                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 689                                         sympltname);
 690                         if (!f)
 691                                 goto out_elf_end;
 692
 693                         if (filter && filter(map, f))
 694                                 symbol__delete(f);
 695                         else {
 696                                 dso__insert_symbol(self, f);
 697                                 ++nr;
 698                         }
 699                 }
 700         }
 701
 702         err = 0;
 703 out_elf_end:
 704         elf_end(elf);
 705 out_close:
 706         close(fd);
 707
 708         if (err == 0)
 709                 return nr;
 710 out:
 711         pr_warning("%s: problems reading %s PLT info.\n",
 712                    __func__, self->long_name);
 713         return 0;
 714 }
 715
 716 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
 717                          int fd, symbol_filter_t filter, int kernel,
 718                          int kmodule)
 719 {
 720         struct map *curr_map = map;
 721         struct dso *curr_dso = self;
 722         size_t dso_name_len = strlen(self->short_name);
 723         Elf_Data *symstrs, *secstrs;
 724         uint32_t nr_syms;
 725         int err = -1;
 726         uint32_t idx;
 727         GElf_Ehdr ehdr;
 728         GElf_Shdr shdr;
 729         Elf_Data *syms;
 730         GElf_Sym sym;
 731         Elf_Scn *sec, *sec_strndx;
 732         Elf *elf;
 733         int nr = 0;
 734
 735         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 736         if (elf == NULL) {
 737                 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
 738                 goto out_close;
 739         }
 740
 741         if (gelf_getehdr(elf, &ehdr) == NULL) {
 742                 pr_err("%s: cannot get elf header.\n", __func__);
 743                 goto out_elf_end;
 744         }
 745
 746         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 747         if (sec == NULL) {
 748                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 749                 if (sec == NULL)
 750                         goto out_elf_end;
 751         }
 752
 753         syms = elf_getdata(sec, NULL);
 754         if (syms == NULL)
 755                 goto out_elf_end;
 756
 757         sec = elf_getscn(elf, shdr.sh_link);
 758         if (sec == NULL)
 759                 goto out_elf_end;
 760
 761         symstrs = elf_getdata(sec, NULL);
 762         if (symstrs == NULL)
 763                 goto out_elf_end;
 764
 765         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 766         if (sec_strndx == NULL)
 767                 goto out_elf_end;
 768
 769         secstrs = elf_getdata(sec_strndx, NULL);
 770         if (secstrs == NULL)
 771                 goto out_elf_end;
 772
 773         nr_syms = shdr.sh_size / shdr.sh_entsize;
 774
 775         memset(&sym, 0, sizeof(sym));
 776         if (!kernel) {
 777                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 778                                 elf_section_by_name(elf, &ehdr, &shdr,
 779                                                      ".gnu.prelink_undo",
 780                                                      NULL) != NULL);
 781         } else self->adjust_symbols = 0;
 782
 783         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 784                 struct symbol *f;
 785                 const char *elf_name;
 786                 char *demangled = NULL;
 787                 int is_label = elf_sym__is_label(&sym);
 788                 const char *section_name;
 789
 790                 if (!is_label && !elf_sym__is_function(&sym))
 791                         continue;
 792
 793                 sec = elf_getscn(elf, sym.st_shndx);
 794                 if (!sec)
 795                         goto out_elf_end;
 796
 797                 gelf_getshdr(sec, &shdr);
 798
 799                 if (is_label && !elf_sec__is_text(&shdr, secstrs))
 800                         continue;
 801
 802                 elf_name = elf_sym__name(&sym, symstrs);
 803                 section_name = elf_sec__name(&shdr, secstrs);
 804
 805                 if (kernel || kmodule) {
 806                         char dso_name[PATH_MAX];
 807
 808                         if (strcmp(section_name,
 809                                    curr_dso->short_name + dso_name_len) == 0)
 810                                 goto new_symbol;
 811
 812                         if (strcmp(section_name, ".text") == 0) {
 813                                 curr_map = map;
 814                                 curr_dso = self;
 815                                 goto new_symbol;
 816                         }
 817
 818                         snprintf(dso_name, sizeof(dso_name),
 819                                  "%s%s", self->short_name, section_name);
 820
 821                         curr_map = kernel_maps__find_by_dso_name(dso_name);
 822                         if (curr_map == NULL) {
 823                                 u64 start = sym.st_value;
 824
 825                                 if (kmodule)
 826                                         start += map->start + shdr.sh_offset;
 827
 828                                 curr_dso = dso__new(dso_name);
 829                                 if (curr_dso == NULL)
 830                                         goto out_elf_end;
 831                                 curr_map = map__new2(start, curr_dso);
 832                                 if (curr_map == NULL) {
 833                                         dso__delete(curr_dso);
 834                                         goto out_elf_end;
 835                                 }
 836                                 curr_map->map_ip = identity__map_ip;
 837                                 curr_map->unmap_ip = identity__map_ip;
 838                                 curr_dso->origin = DSO__ORIG_KERNEL;
 839                                 kernel_maps__insert(curr_map);
 840                                 dsos__add(curr_dso);
 841                         } else
 842                                 curr_dso = curr_map->dso;
 843
 844                         goto new_symbol;
 845                 }
 846
 847                 if (curr_dso->adjust_symbols) {
 848                         pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
 849                                   "%Lx sh_offset: %Lx\n", (u64)sym.st_value,
 850                                   (u64)shdr.sh_addr, (u64)shdr.sh_offset);
 851                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 852                 }
 853                 /*
 854                  * We need to figure out if the object was created from C++ sources
 855                  * DWARF DW_compile_unit has this, but we don't always have access
 856                  * to it...
 857                  */
 858                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
 859                 if (demangled != NULL)
 860                         elf_name = demangled;
 861 new_symbol:
 862                 f = symbol__new(sym.st_value, sym.st_size, elf_name);
 863                 free(demangled);
 864                 if (!f)
 865                         goto out_elf_end;
 866
 867                 if (filter && filter(curr_map, f))
 868                         symbol__delete(f);
 869                 else {
 870                         dso__insert_symbol(curr_dso, f);
 871                         nr++;
 872                 }
 873         }
 874
 875         /*
 876          * For misannotated, zeroed, ASM function sizes.
 877          */
 878         if (nr > 0)
 879                 dso__fixup_sym_end(self);
 880         err = nr;
 881 out_elf_end:
 882         elf_end(elf);
 883 out_close:
 884         return err;
 885 }
 886
 887 bool dsos__read_build_ids(void)
 888 {
 889         bool have_build_id = false;
 890         struct dso *pos;
 891
 892         list_for_each_entry(pos, &dsos, node)
 893                 if (filename__read_build_id(pos->long_name, pos->build_id,
 894                                             sizeof(pos->build_id)) > 0) {
 895                         have_build_id     = true;
 896                         pos->has_build_id = true;
 897                 }
 898
 899         return have_build_id;
 900 }
 901
 902 int filename__read_build_id(const char *filename, void *bf, size_t size)
 903 {
 904         int fd, err = -1;
 905         GElf_Ehdr ehdr;
 906         GElf_Shdr shdr;
 907         Elf_Data *build_id_data;
 908         Elf_Scn *sec;
 909         Elf *elf;
 910
 911         if (size < BUILD_ID_SIZE)
 912                 goto out;
 913
 914         fd = open(filename, O_RDONLY);
 915         if (fd < 0)
 916                 goto out;
 917
 918         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 919         if (elf == NULL) {
 920                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
 921                 goto out_close;
 922         }
 923
 924         if (gelf_getehdr(elf, &ehdr) == NULL) {
 925                 pr_err("%s: cannot get elf header.\n", __func__);
 926                 goto out_elf_end;
 927         }
 928
 929         sec = elf_section_by_name(elf, &ehdr, &shdr,
 930                                   ".note.gnu.build-id", NULL);
 931         if (sec == NULL)
 932                 goto out_elf_end;
 933
 934         build_id_data = elf_getdata(sec, NULL);
 935         if (build_id_data == NULL)
 936                 goto out_elf_end;
 937         memcpy(bf, build_id_data->d_buf + 16, BUILD_ID_SIZE);
 938         err = BUILD_ID_SIZE;
 939 out_elf_end:
 940         elf_end(elf);
 941 out_close:
 942         close(fd);
 943 out:
 944         return err;
 945 }
 946
 947 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
 948 {
 949         int fd, err = -1;
 950
 951         if (size < BUILD_ID_SIZE)
 952                 goto out;
 953
 954         fd = open(filename, O_RDONLY);
 955         if (fd < 0)
 956                 goto out;
 957
 958         while (1) {
 959                 char bf[BUFSIZ];
 960                 GElf_Nhdr nhdr;
 961                 int namesz, descsz;
 962
 963                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
 964                         break;
 965
 966                 namesz = (nhdr.n_namesz + 3) & -4U;
 967                 descsz = (nhdr.n_descsz + 3) & -4U;
 968                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
 969                     nhdr.n_namesz == sizeof("GNU")) {
 970                         if (read(fd, bf, namesz) != namesz)
 971                                 break;
 972                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
 973                                 if (read(fd, build_id,
 974                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
 975                                         err = 0;
 976                                         break;
 977                                 }
 978                         } else if (read(fd, bf, descsz) != descsz)
 979                                 break;
 980                 } else {
 981                         int n = namesz + descsz;
 982                         if (read(fd, bf, n) != n)
 983                                 break;
 984                 }
 985         }
 986         close(fd);
 987 out:
 988         return err;
 989 }
 990
 991 char dso__symtab_origin(const struct dso *self)
 992 {
 993         static const char origin[] = {
 994                 [DSO__ORIG_KERNEL] =   'k',
 995                 [DSO__ORIG_JAVA_JIT] = 'j',
 996                 [DSO__ORIG_FEDORA] =   'f',
 997                 [DSO__ORIG_UBUNTU] =   'u',
 998                 [DSO__ORIG_BUILDID] =  'b',
 999                 [DSO__ORIG_DSO] =      'd',
1000                 [DSO__ORIG_KMODULE] =  'K',
1001         };
1002
1003         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1004                 return '!';
1005         return origin[self->origin];
1006 }
1007
1008 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1009 {
1010         int size = PATH_MAX;
1011         char *name = malloc(size);
1012         u8 build_id[BUILD_ID_SIZE];
1013         int ret = -1;
1014         int fd;
1015
1016         self->loaded = 1;
1017
1018         if (!name)
1019                 return -1;
1020
1021         self->adjust_symbols = 0;
1022
1023         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1024                 ret = dso__load_perf_map(self, map, filter);
1025                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1026                                          DSO__ORIG_NOT_FOUND;
1027                 return ret;
1028         }
1029
1030         self->origin = DSO__ORIG_FEDORA - 1;
1031
1032 more:
1033         do {
1034                 self->origin++;
1035                 switch (self->origin) {
1036                 case DSO__ORIG_FEDORA:
1037                         snprintf(name, size, "/usr/lib/debug%s.debug",
1038                                  self->long_name);
1039                         break;
1040                 case DSO__ORIG_UBUNTU:
1041                         snprintf(name, size, "/usr/lib/debug%s",
1042                                  self->long_name);
1043                         break;
1044                 case DSO__ORIG_BUILDID:
1045                         if (filename__read_build_id(self->long_name, build_id,
1046                                                     sizeof(build_id))) {
1047                                 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1048
1049                                 build_id__sprintf(build_id, sizeof(build_id),
1050                                                   build_id_hex);
1051                                 snprintf(name, size,
1052                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
1053                                         build_id_hex, build_id_hex + 2);
1054                                 if (self->has_build_id)
1055                                         goto compare_build_id;
1056                                 break;
1057                         }
1058                         self->origin++;
1059                         /* Fall thru */
1060                 case DSO__ORIG_DSO:
1061                         snprintf(name, size, "%s", self->long_name);
1062                         break;
1063
1064                 default:
1065                         goto out;
1066                 }
1067
1068                 if (self->has_build_id) {
1069                         if (filename__read_build_id(name, build_id,
1070                                                     sizeof(build_id)) < 0)
1071                                 goto more;
1072 compare_build_id:
1073                         if (memcmp(build_id, self->build_id,
1074                                    sizeof(self->build_id)) != 0)
1075                                 goto more;
1076                 }
1077
1078                 fd = open(name, O_RDONLY);
1079         } while (fd < 0);
1080
1081         ret = dso__load_sym(self, map, name, fd, filter, 0, 0);
1082         close(fd);
1083
1084         /*
1085          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1086          */
1087         if (!ret)
1088                 goto more;
1089
1090         if (ret > 0) {
1091                 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1092                 if (nr_plt > 0)
1093                         ret += nr_plt;
1094         }
1095 out:
1096         free(name);
1097         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1098                 return 0;
1099         return ret;
1100 }
1101
1102 struct map *kernel_map;
1103
1104 static void kernel_maps__insert(struct map *map)
1105 {
1106         maps__insert(&kernel_maps, map);
1107 }
1108
1109 struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp)
1110 {
1111         struct map *map = maps__find(&kernel_maps, ip);
1112
1113         if (mapp)
1114                 *mapp = map;
1115
1116         if (map) {
1117                 ip = map->map_ip(map, ip);
1118                 return map->dso->find_symbol(map->dso, ip);
1119         }
1120
1121         return NULL;
1122 }
1123
1124 struct map *kernel_maps__find_by_dso_name(const char *name)
1125 {
1126         struct rb_node *nd;
1127
1128         for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) {
1129                 struct map *map = rb_entry(nd, struct map, rb_node);
1130
1131                 if (map->dso && strcmp(map->dso->name, name) == 0)
1132                         return map;
1133         }
1134
1135         return NULL;
1136 }
1137
1138 static int dso__load_module_sym(struct dso *self, struct map *map,
1139                                 symbol_filter_t filter)
1140 {
1141         int err = 0, fd = open(self->long_name, O_RDONLY);
1142
1143         self->loaded = 1;
1144
1145         if (fd < 0) {
1146                 pr_err("%s: cannot open %s\n", __func__, self->long_name);
1147                 return err;
1148         }
1149
1150         err = dso__load_sym(self, map, self->long_name, fd, filter, 0, 1);
1151         close(fd);
1152
1153         return err;
1154 }
1155
1156 static int dsos__load_modules_sym_dir(char *dirname, symbol_filter_t filter)
1157 {
1158         struct dirent *dent;
1159         int nr_symbols = 0, err;
1160         DIR *dir = opendir(dirname);
1161
1162         if (!dir) {
1163                 pr_err("%s: cannot open %s dir\n", __func__, dirname);
1164                 return -1;
1165         }
1166
1167         while ((dent = readdir(dir)) != NULL) {
1168                 char path[PATH_MAX];
1169
1170                 if (dent->d_type == DT_DIR) {
1171                         if (!strcmp(dent->d_name, ".") ||
1172                             !strcmp(dent->d_name, ".."))
1173                                 continue;
1174
1175                         snprintf(path, sizeof(path), "%s/%s",
1176                                  dirname, dent->d_name);
1177                         err = dsos__load_modules_sym_dir(path, filter);
1178                         if (err < 0)
1179                                 goto failure;
1180                 } else {
1181                         char *dot = strrchr(dent->d_name, '.'),
1182                              dso_name[PATH_MAX];
1183                         struct map *map;
1184                         struct rb_node *last;
1185                         char *long_name;
1186
1187                         if (dot == NULL || strcmp(dot, ".ko"))
1188                                 continue;
1189                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1190                                  (int)(dot - dent->d_name), dent->d_name);
1191
1192                         strxfrchar(dso_name, '-', '_');
1193                         map = kernel_maps__find_by_dso_name(dso_name);
1194                         if (map == NULL)
1195                                 continue;
1196
1197                         snprintf(path, sizeof(path), "%s/%s",
1198                                  dirname, dent->d_name);
1199
1200                         long_name = strdup(path);
1201                         if (long_name == NULL)
1202                                 goto failure;
1203                         dso__set_long_name(map->dso, long_name);
1204                         dso__set_basename(map->dso);
1205
1206                         err = dso__load_module_sym(map->dso, map, filter);
1207                         if (err < 0)
1208                                 goto failure;
1209                         last = rb_last(&map->dso->syms);
1210                         if (last) {
1211                                 struct symbol *sym;
1212                                 /*
1213                                  * We do this here as well, even having the
1214                                  * symbol size found in the symtab because
1215                                  * misannotated ASM symbols may have the size
1216                                  * set to zero.
1217                                  */
1218                                 dso__fixup_sym_end(map->dso);
1219
1220                                 sym = rb_entry(last, struct symbol, rb_node);
1221                                 map->end = map->start + sym->end;
1222                         }
1223                 }
1224                 nr_symbols += err;
1225         }
1226
1227         return nr_symbols;
1228 failure:
1229         closedir(dir);
1230         return -1;
1231 }
1232
1233 int dsos__load_modules_sym(symbol_filter_t filter)
1234 {
1235         struct utsname uts;
1236         char modules_path[PATH_MAX];
1237
1238         if (uname(&uts) < 0)
1239                 return -1;
1240
1241         snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1242                  uts.release);
1243
1244         return dsos__load_modules_sym_dir(modules_path, filter);
1245 }
1246
1247 /*
1248  * Constructor variant for modules (where we know from /proc/modules where
1249  * they are loaded) and for vmlinux, where only after we load all the
1250  * symbols we'll know where it starts and ends.
1251  */
1252 static struct map *map__new2(u64 start, struct dso *dso)
1253 {
1254         struct map *self = malloc(sizeof(*self));
1255
1256         if (self != NULL) {
1257                 /*
1258                  * ->end will be filled after we load all the symbols
1259                  */
1260                 map__init(self, start, 0, 0, dso);
1261         }
1262
1263         return self;
1264 }
1265
1266 int dsos__load_modules(void)
1267 {
1268         char *line = NULL;
1269         size_t n;
1270         FILE *file = fopen("/proc/modules", "r");
1271         struct map *map;
1272
1273         if (file == NULL)
1274                 return -1;
1275
1276         while (!feof(file)) {
1277                 char name[PATH_MAX];
1278                 u64 start;
1279                 struct dso *dso;
1280                 char *sep;
1281                 int line_len;
1282
1283                 line_len = getline(&line, &n, file);
1284                 if (line_len < 0)
1285                         break;
1286
1287                 if (!line)
1288                         goto out_failure;
1289
1290                 line[--line_len] = '\0'; /* \n */
1291
1292                 sep = strrchr(line, 'x');
1293                 if (sep == NULL)
1294                         continue;
1295
1296                 hex2u64(sep + 1, &start);
1297
1298                 sep = strchr(line, ' ');
1299                 if (sep == NULL)
1300                         continue;
1301
1302                 *sep = '\0';
1303
1304                 snprintf(name, sizeof(name), "[%s]", line);
1305                 dso = dso__new(name);
1306
1307                 if (dso == NULL)
1308                         goto out_delete_line;
1309
1310                 map = map__new2(start, dso);
1311                 if (map == NULL) {
1312                         dso__delete(dso);
1313                         goto out_delete_line;
1314                 }
1315
1316                 snprintf(name, sizeof(name),
1317                          "/sys/module/%s/notes/.note.gnu.build-id", line);
1318                 if (sysfs__read_build_id(name, dso->build_id,
1319                                          sizeof(dso->build_id)) == 0)
1320                         dso->has_build_id = true;
1321
1322                 dso->origin = DSO__ORIG_KMODULE;
1323                 kernel_maps__insert(map);
1324                 dsos__add(dso);
1325         }
1326
1327         free(line);
1328         fclose(file);
1329
1330         return 0;
1331
1332 out_delete_line:
1333         free(line);
1334 out_failure:
1335         return -1;
1336 }
1337
1338 static int dso__load_vmlinux(struct dso *self, struct map *map,
1339                              const char *vmlinux, symbol_filter_t filter)
1340 {
1341         int err, fd = open(vmlinux, O_RDONLY);
1342
1343         self->loaded = 1;
1344
1345         if (fd < 0)
1346                 return -1;
1347
1348         err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0);
1349
1350         close(fd);
1351
1352         return err;
1353 }
1354
1355 int dso__load_kernel_sym(struct dso *self, symbol_filter_t filter,
1356                          int use_modules)
1357 {
1358         int err;
1359
1360         kernel_map = map__new2(0, self);
1361         if (kernel_map == NULL)
1362                 return -1;
1363
1364         kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
1365
1366         err = dso__load_vmlinux(self, kernel_map, self->name, filter);
1367         if (err <= 0)
1368                 err = kernel_maps__load_kallsyms(filter, use_modules);
1369
1370         if (err > 0) {
1371                 struct rb_node *node = rb_first(&self->syms);
1372                 struct symbol *sym = rb_entry(node, struct symbol, rb_node);
1373
1374                 kernel_map->start = sym->start;
1375                 node = rb_last(&self->syms);
1376                 sym = rb_entry(node, struct symbol, rb_node);
1377                 kernel_map->end = sym->end;
1378
1379                 self->origin = DSO__ORIG_KERNEL;
1380                 kernel_maps__insert(kernel_map);
1381                 /*
1382                  * Now that we have all sorted out, just set the ->end of all
1383                  * maps:
1384                  */
1385                 kernel_maps__fixup_end();
1386
1387                 if (verbose)
1388                         kernel_maps__fprintf(stderr);
1389         }
1390
1391         return err;
1392 }
1393
1394 LIST_HEAD(dsos);
1395 struct dso      *vdso;
1396
1397 const char      *vmlinux_name = "vmlinux";
1398
1399 static void dsos__add(struct dso *dso)
1400 {
1401         list_add_tail(&dso->node, &dsos);
1402 }
1403
1404 static struct dso *dsos__find(const char *name)
1405 {
1406         struct dso *pos;
1407
1408         list_for_each_entry(pos, &dsos, node)
1409                 if (strcmp(pos->name, name) == 0)
1410                         return pos;
1411         return NULL;
1412 }
1413
1414 struct dso *dsos__findnew(const char *name)
1415 {
1416         struct dso *dso = dsos__find(name);
1417
1418         if (!dso) {
1419                 dso = dso__new(name);
1420                 if (dso != NULL) {
1421                         dsos__add(dso);
1422                         dso__set_basename(dso);
1423                 }
1424         }
1425
1426         return dso;
1427 }
1428
1429 void dsos__fprintf(FILE *fp)
1430 {
1431         struct dso *pos;
1432
1433         list_for_each_entry(pos, &dsos, node)
1434                 dso__fprintf(pos, fp);
1435 }
1436
1437 size_t dsos__fprintf_buildid(FILE *fp)
1438 {
1439         struct dso *pos;
1440         size_t ret = 0;
1441
1442         list_for_each_entry(pos, &dsos, node) {
1443                 ret += dso__fprintf_buildid(pos, fp);
1444                 ret += fprintf(fp, " %s\n", pos->long_name);
1445         }
1446         return ret;
1447 }
1448
1449 struct dso *dsos__load_kernel(void)
1450 {
1451         struct dso *kernel = dso__new(vmlinux_name);
1452
1453         if (kernel == NULL)
1454                 return NULL;
1455
1456         kernel->short_name = "[kernel]";
1457         vdso = dso__new("[vdso]");
1458         if (!vdso)
1459                 return NULL;
1460
1461         if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
1462                                  sizeof(kernel->build_id)) == 0)
1463                 kernel->has_build_id = true;
1464
1465         dsos__add(kernel);
1466         dsos__add(vdso);
1467
1468         return kernel;
1469 }
1470
1471 int load_kernel(symbol_filter_t filter, bool use_modules)
1472 {
1473         struct dso *kernel = dsos__load_kernel();
1474
1475         if (kernel == NULL)
1476                 return -1;
1477
1478         if (use_modules) {
1479                 if (dsos__load_modules() < 0)
1480                         pr_warning("Failed to load list of modules in use, "
1481                                    "continuing...\n");
1482                 else if (dsos__load_modules_sym(filter) < 0)
1483                         pr_warning("Failed to read module symbols, "
1484                                    "continuing...\n");
1485         }
1486
1487         if (dso__load_kernel_sym(kernel, filter, use_modules) < 0)
1488                 pr_warning("Failed to read kernel symbols, continuing...\n");
1489
1490         return 0;
1491 }
1492
1493 void symbol__init(unsigned int priv_size)
1494 {
1495         elf_version(EV_CURRENT);
1496         symbol__priv_size = priv_size;
1497 }