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 #ifndef NT_GNU_BUILD_ID
  16 #define NT_GNU_BUILD_ID 3
  17 #endif
  18
  19 enum dso_origin {
  20         DSO__ORIG_KERNEL = 0,
  21         DSO__ORIG_JAVA_JIT,
  22         DSO__ORIG_FEDORA,
  23         DSO__ORIG_UBUNTU,
  24         DSO__ORIG_BUILDID,
  25         DSO__ORIG_DSO,
  26         DSO__ORIG_KMODULE,
  27         DSO__ORIG_NOT_FOUND,
  28 };
  29
  30 static void dsos__add(struct dso *dso);
  31 static struct dso *dsos__find(const char *name);
  32 static struct map *map__new2(u64 start, struct dso *dso);
  33 static void kernel_maps__insert(struct map *map);
  34 static int dso__load_kernel_sym(struct dso *self, struct map *map,
  35                                 symbol_filter_t filter);
  36 unsigned int symbol__priv_size;
  37
  38 static struct rb_root kernel_maps;
  39
  40 static void dso__fixup_sym_end(struct dso *self)
  41 {
  42         struct rb_node *nd, *prevnd = rb_first(&self->syms);
  43         struct symbol *curr, *prev;
  44
  45         if (prevnd == NULL)
  46                 return;
  47
  48         curr = rb_entry(prevnd, struct symbol, rb_node);
  49
  50         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  51                 prev = curr;
  52                 curr = rb_entry(nd, struct symbol, rb_node);
  53
  54                 if (prev->end == prev->start)
  55                         prev->end = curr->start - 1;
  56         }
  57
  58         /* Last entry */
  59         if (curr->end == curr->start)
  60                 curr->end = roundup(curr->start, 4096);
  61 }
  62
  63 static void kernel_maps__fixup_end(void)
  64 {
  65         struct map *prev, *curr;
  66         struct rb_node *nd, *prevnd = rb_first(&kernel_maps);
  67
  68         if (prevnd == NULL)
  69                 return;
  70
  71         curr = rb_entry(prevnd, struct map, rb_node);
  72
  73         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  74                 prev = curr;
  75                 curr = rb_entry(nd, struct map, rb_node);
  76                 prev->end = curr->start - 1;
  77         }
  78
  79         /*
  80          * We still haven't the actual symbols, so guess the
  81          * last map final address.
  82          */
  83         curr->end = ~0UL;
  84 }
  85
  86 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
  87 {
  88         size_t namelen = strlen(name) + 1;
  89         struct symbol *self = calloc(1, (symbol__priv_size +
  90                                          sizeof(*self) + namelen));
  91         if (!self)
  92                 return NULL;
  93
  94         if (symbol__priv_size) {
  95                 memset(self, 0, symbol__priv_size);
  96                 self = ((void *)self) + symbol__priv_size;
  97         }
  98         self->start = start;
  99         self->end   = len ? start + len - 1 : start;
 100
 101         pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
 102
 103         memcpy(self->name, name, namelen);
 104
 105         return self;
 106 }
 107
 108 static void symbol__delete(struct symbol *self)
 109 {
 110         free(((void *)self) - symbol__priv_size);
 111 }
 112
 113 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 114 {
 115         return fprintf(fp, " %llx-%llx %s\n",
 116                        self->start, self->end, self->name);
 117 }
 118
 119 static void dso__set_long_name(struct dso *self, char *name)
 120 {
 121         if (name == NULL)
 122                 return;
 123         self->long_name = name;
 124         self->long_name_len = strlen(name);
 125 }
 126
 127 static void dso__set_basename(struct dso *self)
 128 {
 129         self->short_name = basename(self->long_name);
 130 }
 131
 132 struct dso *dso__new(const char *name)
 133 {
 134         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 135
 136         if (self != NULL) {
 137                 strcpy(self->name, name);
 138                 dso__set_long_name(self, self->name);
 139                 self->short_name = self->name;
 140                 self->syms = RB_ROOT;
 141                 self->find_symbol = dso__find_symbol;
 142                 self->slen_calculated = 0;
 143                 self->origin = DSO__ORIG_NOT_FOUND;
 144                 self->loaded = 0;
 145                 self->has_build_id = 0;
 146         }
 147
 148         return self;
 149 }
 150
 151 static void dso__delete_symbols(struct dso *self)
 152 {
 153         struct symbol *pos;
 154         struct rb_node *next = rb_first(&self->syms);
 155
 156         while (next) {
 157                 pos = rb_entry(next, struct symbol, rb_node);
 158                 next = rb_next(&pos->rb_node);
 159                 rb_erase(&pos->rb_node, &self->syms);
 160                 symbol__delete(pos);
 161         }
 162 }
 163
 164 void dso__delete(struct dso *self)
 165 {
 166         dso__delete_symbols(self);
 167         if (self->long_name != self->name)
 168                 free(self->long_name);
 169         free(self);
 170 }
 171
 172 void dso__set_build_id(struct dso *self, void *build_id)
 173 {
 174         memcpy(self->build_id, build_id, sizeof(self->build_id));
 175         self->has_build_id = 1;
 176 }
 177
 178 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
 179 {
 180         struct rb_node **p = &self->syms.rb_node;
 181         struct rb_node *parent = NULL;
 182         const u64 ip = sym->start;
 183         struct symbol *s;
 184
 185         while (*p != NULL) {
 186                 parent = *p;
 187                 s = rb_entry(parent, struct symbol, rb_node);
 188                 if (ip < s->start)
 189                         p = &(*p)->rb_left;
 190                 else
 191                         p = &(*p)->rb_right;
 192         }
 193         rb_link_node(&sym->rb_node, parent, p);
 194         rb_insert_color(&sym->rb_node, &self->syms);
 195 }
 196
 197 struct symbol *dso__find_symbol(struct dso *self, u64 ip)
 198 {
 199         struct rb_node *n;
 200
 201         if (self == NULL)
 202                 return NULL;
 203
 204         n = self->syms.rb_node;
 205
 206         while (n) {
 207                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 208
 209                 if (ip < s->start)
 210                         n = n->rb_left;
 211                 else if (ip > s->end)
 212                         n = n->rb_right;
 213                 else
 214                         return s;
 215         }
 216
 217         return NULL;
 218 }
 219
 220 int build_id__sprintf(u8 *self, int len, char *bf)
 221 {
 222         char *bid = bf;
 223         u8 *raw = self;
 224         int i;
 225
 226         for (i = 0; i < len; ++i) {
 227                 sprintf(bid, "%02x", *raw);
 228                 ++raw;
 229                 bid += 2;
 230         }
 231
 232         return raw - self;
 233 }
 234
 235 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 236 {
 237         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 238
 239         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 240         return fprintf(fp, "%s", sbuild_id);
 241 }
 242
 243 size_t dso__fprintf(struct dso *self, FILE *fp)
 244 {
 245         struct rb_node *nd;
 246         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 247
 248         ret += dso__fprintf_buildid(self, fp);
 249         ret += fprintf(fp, ")\n");
 250
 251         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
 252                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 253                 ret += symbol__fprintf(pos, fp);
 254         }
 255
 256         return ret;
 257 }
 258
 259 /*
 260  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 261  * so that we can in the next step set the symbol ->end address and then
 262  * call kernel_maps__split_kallsyms.
 263  */
 264 static int kernel_maps__load_all_kallsyms(void)
 265 {
 266         char *line = NULL;
 267         size_t n;
 268         FILE *file = fopen("/proc/kallsyms", "r");
 269
 270         if (file == NULL)
 271                 goto out_failure;
 272
 273         while (!feof(file)) {
 274                 u64 start;
 275                 struct symbol *sym;
 276                 int line_len, len;
 277                 char symbol_type;
 278                 char *symbol_name;
 279
 280                 line_len = getline(&line, &n, file);
 281                 if (line_len < 0)
 282                         break;
 283
 284                 if (!line)
 285                         goto out_failure;
 286
 287                 line[--line_len] = '\0'; /* \n */
 288
 289                 len = hex2u64(line, &start);
 290
 291                 len++;
 292                 if (len + 2 >= line_len)
 293                         continue;
 294
 295                 symbol_type = toupper(line[len]);
 296                 /*
 297                  * We're interested only in code ('T'ext)
 298                  */
 299                 if (symbol_type != 'T' && symbol_type != 'W')
 300                         continue;
 301
 302                 symbol_name = line + len + 2;
 303                 /*
 304                  * Will fix up the end later, when we have all symbols sorted.
 305                  */
 306                 sym = symbol__new(start, 0, symbol_name);
 307
 308                 if (sym == NULL)
 309                         goto out_delete_line;
 310
 311                 /*
 312                  * We will pass the symbols to the filter later, in
 313                  * kernel_maps__split_kallsyms, when we have split the
 314                  * maps per module
 315                  */
 316                 dso__insert_symbol(kernel_map->dso, sym);
 317         }
 318
 319         free(line);
 320         fclose(file);
 321
 322         return 0;
 323
 324 out_delete_line:
 325         free(line);
 326 out_failure:
 327         return -1;
 328 }
 329
 330 /*
 331  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 332  * kernel range is broken in several maps, named [kernel].N, as we don't have
 333  * the original ELF section names vmlinux have.
 334  */
 335 static int kernel_maps__split_kallsyms(symbol_filter_t filter)
 336 {
 337         struct map *map = kernel_map;
 338         struct symbol *pos;
 339         int count = 0;
 340         struct rb_node *next = rb_first(&kernel_map->dso->syms);
 341         int kernel_range = 0;
 342
 343         while (next) {
 344                 char *module;
 345
 346                 pos = rb_entry(next, struct symbol, rb_node);
 347                 next = rb_next(&pos->rb_node);
 348
 349                 module = strchr(pos->name, '\t');
 350                 if (module) {
 351                         *module++ = '\0';
 352
 353                         if (strcmp(map->dso->name, module)) {
 354                                 map = kernel_maps__find_by_dso_name(module);
 355                                 if (!map) {
 356                                         pr_err("/proc/{kallsyms,modules} "
 357                                                "inconsistency!\n");
 358                                         return -1;
 359                                 }
 360                         }
 361                         /*
 362                          * So that we look just like we get from .ko files,
 363                          * i.e. not prelinked, relative to map->start.
 364                          */
 365                         pos->start = map->map_ip(map, pos->start);
 366                         pos->end   = map->map_ip(map, pos->end);
 367                 } else if (map != kernel_map) {
 368                         char dso_name[PATH_MAX];
 369                         struct dso *dso;
 370
 371                         snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
 372                                  kernel_range++);
 373
 374                         dso = dso__new(dso_name);
 375                         if (dso == NULL)
 376                                 return -1;
 377
 378                         map = map__new2(pos->start, dso);
 379                         if (map == NULL) {
 380                                 dso__delete(dso);
 381                                 return -1;
 382                         }
 383
 384                         map->map_ip = map->unmap_ip = identity__map_ip;
 385                         kernel_maps__insert(map);
 386                         ++kernel_range;
 387                 }
 388
 389                 if (filter && filter(map, pos)) {
 390                         rb_erase(&pos->rb_node, &kernel_map->dso->syms);
 391                         symbol__delete(pos);
 392                 } else {
 393                         if (map != kernel_map) {
 394                                 rb_erase(&pos->rb_node, &kernel_map->dso->syms);
 395                                 dso__insert_symbol(map->dso, pos);
 396                         }
 397                         count++;
 398                 }
 399         }
 400
 401         return count;
 402 }
 403
 404
 405 static int kernel_maps__load_kallsyms(symbol_filter_t filter)
 406 {
 407         if (kernel_maps__load_all_kallsyms())
 408                 return -1;
 409
 410         dso__fixup_sym_end(kernel_map->dso);
 411         kernel_map->dso->origin = DSO__ORIG_KERNEL;
 412
 413         return kernel_maps__split_kallsyms(filter);
 414 }
 415
 416 size_t kernel_maps__fprintf(FILE *fp)
 417 {
 418         size_t printed = fprintf(fp, "Kernel maps:\n");
 419         struct rb_node *nd;
 420
 421         for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) {
 422                 struct map *pos = rb_entry(nd, struct map, rb_node);
 423
 424                 printed += fprintf(fp, "Map:");
 425                 printed += map__fprintf(pos, fp);
 426                 if (verbose > 1) {
 427                         printed += dso__fprintf(pos->dso, fp);
 428                         printed += fprintf(fp, "--\n");
 429                 }
 430         }
 431
 432         return printed + fprintf(fp, "END kernel maps\n");
 433 }
 434
 435 static int dso__load_perf_map(struct dso *self, struct map *map,
 436                               symbol_filter_t filter)
 437 {
 438         char *line = NULL;
 439         size_t n;
 440         FILE *file;
 441         int nr_syms = 0;
 442
 443         file = fopen(self->long_name, "r");
 444         if (file == NULL)
 445                 goto out_failure;
 446
 447         while (!feof(file)) {
 448                 u64 start, size;
 449                 struct symbol *sym;
 450                 int line_len, len;
 451
 452                 line_len = getline(&line, &n, file);
 453                 if (line_len < 0)
 454                         break;
 455
 456                 if (!line)
 457                         goto out_failure;
 458
 459                 line[--line_len] = '\0'; /* \n */
 460
 461                 len = hex2u64(line, &start);
 462
 463                 len++;
 464                 if (len + 2 >= line_len)
 465                         continue;
 466
 467                 len += hex2u64(line + len, &size);
 468
 469                 len++;
 470                 if (len + 2 >= line_len)
 471                         continue;
 472
 473                 sym = symbol__new(start, size, line + len);
 474
 475                 if (sym == NULL)
 476                         goto out_delete_line;
 477
 478                 if (filter && filter(map, sym))
 479                         symbol__delete(sym);
 480                 else {
 481                         dso__insert_symbol(self, sym);
 482                         nr_syms++;
 483                 }
 484         }
 485
 486         free(line);
 487         fclose(file);
 488
 489         return nr_syms;
 490
 491 out_delete_line:
 492         free(line);
 493 out_failure:
 494         return -1;
 495 }
 496
 497 /**
 498  * elf_symtab__for_each_symbol - iterate thru all the symbols
 499  *
 500  * @self: struct elf_symtab instance to iterate
 501  * @idx: uint32_t idx
 502  * @sym: GElf_Sym iterator
 503  */
 504 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 505         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 506              idx < nr_syms; \
 507              idx++, gelf_getsym(syms, idx, &sym))
 508
 509 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 510 {
 511         return GELF_ST_TYPE(sym->st_info);
 512 }
 513
 514 static inline int elf_sym__is_function(const GElf_Sym *sym)
 515 {
 516         return elf_sym__type(sym) == STT_FUNC &&
 517                sym->st_name != 0 &&
 518                sym->st_shndx != SHN_UNDEF;
 519 }
 520
 521 static inline int elf_sym__is_label(const GElf_Sym *sym)
 522 {
 523         return elf_sym__type(sym) == STT_NOTYPE &&
 524                 sym->st_name != 0 &&
 525                 sym->st_shndx != SHN_UNDEF &&
 526                 sym->st_shndx != SHN_ABS;
 527 }
 528
 529 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 530                                         const Elf_Data *secstrs)
 531 {
 532         return secstrs->d_buf + shdr->sh_name;
 533 }
 534
 535 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 536                                         const Elf_Data *secstrs)
 537 {
 538         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 539 }
 540
 541 static inline const char *elf_sym__name(const GElf_Sym *sym,
 542                                         const Elf_Data *symstrs)
 543 {
 544         return symstrs->d_buf + sym->st_name;
 545 }
 546
 547 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 548                                     GElf_Shdr *shp, const char *name,
 549                                     size_t *idx)
 550 {
 551         Elf_Scn *sec = NULL;
 552         size_t cnt = 1;
 553
 554         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 555                 char *str;
 556
 557                 gelf_getshdr(sec, shp);
 558                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 559                 if (!strcmp(name, str)) {
 560                         if (idx)
 561                                 *idx = cnt;
 562                         break;
 563                 }
 564                 ++cnt;
 565         }
 566
 567         return sec;
 568 }
 569
 570 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 571         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 572              idx < nr_entries; \
 573              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 574
 575 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 576         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 577              idx < nr_entries; \
 578              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 579
 580 /*
 581  * We need to check if we have a .dynsym, so that we can handle the
 582  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 583  * .dynsym or .symtab).
 584  * And always look at the original dso, not at debuginfo packages, that
 585  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 586  */
 587 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 588                                        symbol_filter_t filter)
 589 {
 590         uint32_t nr_rel_entries, idx;
 591         GElf_Sym sym;
 592         u64 plt_offset;
 593         GElf_Shdr shdr_plt;
 594         struct symbol *f;
 595         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 596         Elf_Data *reldata, *syms, *symstrs;
 597         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 598         size_t dynsym_idx;
 599         GElf_Ehdr ehdr;
 600         char sympltname[1024];
 601         Elf *elf;
 602         int nr = 0, symidx, fd, err = 0;
 603
 604         fd = open(self->long_name, O_RDONLY);
 605         if (fd < 0)
 606                 goto out;
 607
 608         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 609         if (elf == NULL)
 610                 goto out_close;
 611
 612         if (gelf_getehdr(elf, &ehdr) == NULL)
 613                 goto out_elf_end;
 614
 615         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 616                                          ".dynsym", &dynsym_idx);
 617         if (scn_dynsym == NULL)
 618                 goto out_elf_end;
 619
 620         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 621                                           ".rela.plt", NULL);
 622         if (scn_plt_rel == NULL) {
 623                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 624                                                   ".rel.plt", NULL);
 625                 if (scn_plt_rel == NULL)
 626                         goto out_elf_end;
 627         }
 628
 629         err = -1;
 630
 631         if (shdr_rel_plt.sh_link != dynsym_idx)
 632                 goto out_elf_end;
 633
 634         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 635                 goto out_elf_end;
 636
 637         /*
 638          * Fetch the relocation section to find the idxes to the GOT
 639          * and the symbols in the .dynsym they refer to.
 640          */
 641         reldata = elf_getdata(scn_plt_rel, NULL);
 642         if (reldata == NULL)
 643                 goto out_elf_end;
 644
 645         syms = elf_getdata(scn_dynsym, NULL);
 646         if (syms == NULL)
 647                 goto out_elf_end;
 648
 649         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 650         if (scn_symstrs == NULL)
 651                 goto out_elf_end;
 652
 653         symstrs = elf_getdata(scn_symstrs, NULL);
 654         if (symstrs == NULL)
 655                 goto out_elf_end;
 656
 657         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 658         plt_offset = shdr_plt.sh_offset;
 659
 660         if (shdr_rel_plt.sh_type == SHT_RELA) {
 661                 GElf_Rela pos_mem, *pos;
 662
 663                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 664                                            nr_rel_entries) {
 665                         symidx = GELF_R_SYM(pos->r_info);
 666                         plt_offset += shdr_plt.sh_entsize;
 667                         gelf_getsym(syms, symidx, &sym);
 668                         snprintf(sympltname, sizeof(sympltname),
 669                                  "%s@plt", elf_sym__name(&sym, symstrs));
 670
 671                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 672                                         sympltname);
 673                         if (!f)
 674                                 goto out_elf_end;
 675
 676                         if (filter && filter(map, f))
 677                                 symbol__delete(f);
 678                         else {
 679                                 dso__insert_symbol(self, f);
 680                                 ++nr;
 681                         }
 682                 }
 683         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 684                 GElf_Rel pos_mem, *pos;
 685                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 686                                           nr_rel_entries) {
 687                         symidx = GELF_R_SYM(pos->r_info);
 688                         plt_offset += shdr_plt.sh_entsize;
 689                         gelf_getsym(syms, symidx, &sym);
 690                         snprintf(sympltname, sizeof(sympltname),
 691                                  "%s@plt", elf_sym__name(&sym, symstrs));
 692
 693                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 694                                         sympltname);
 695                         if (!f)
 696                                 goto out_elf_end;
 697
 698                         if (filter && filter(map, f))
 699                                 symbol__delete(f);
 700                         else {
 701                                 dso__insert_symbol(self, f);
 702                                 ++nr;
 703                         }
 704                 }
 705         }
 706
 707         err = 0;
 708 out_elf_end:
 709         elf_end(elf);
 710 out_close:
 711         close(fd);
 712
 713         if (err == 0)
 714                 return nr;
 715 out:
 716         pr_warning("%s: problems reading %s PLT info.\n",
 717                    __func__, self->long_name);
 718         return 0;
 719 }
 720
 721 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
 722                          int fd, symbol_filter_t filter, int kernel,
 723                          int kmodule)
 724 {
 725         struct map *curr_map = map;
 726         struct dso *curr_dso = self;
 727         size_t dso_name_len = strlen(self->short_name);
 728         Elf_Data *symstrs, *secstrs;
 729         uint32_t nr_syms;
 730         int err = -1;
 731         uint32_t idx;
 732         GElf_Ehdr ehdr;
 733         GElf_Shdr shdr;
 734         Elf_Data *syms;
 735         GElf_Sym sym;
 736         Elf_Scn *sec, *sec_strndx;
 737         Elf *elf;
 738         int nr = 0;
 739
 740         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 741         if (elf == NULL) {
 742                 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
 743                 goto out_close;
 744         }
 745
 746         if (gelf_getehdr(elf, &ehdr) == NULL) {
 747                 pr_err("%s: cannot get elf header.\n", __func__);
 748                 goto out_elf_end;
 749         }
 750
 751         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 752         if (sec == NULL) {
 753                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 754                 if (sec == NULL)
 755                         goto out_elf_end;
 756         }
 757
 758         syms = elf_getdata(sec, NULL);
 759         if (syms == NULL)
 760                 goto out_elf_end;
 761
 762         sec = elf_getscn(elf, shdr.sh_link);
 763         if (sec == NULL)
 764                 goto out_elf_end;
 765
 766         symstrs = elf_getdata(sec, NULL);
 767         if (symstrs == NULL)
 768                 goto out_elf_end;
 769
 770         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 771         if (sec_strndx == NULL)
 772                 goto out_elf_end;
 773
 774         secstrs = elf_getdata(sec_strndx, NULL);
 775         if (secstrs == NULL)
 776                 goto out_elf_end;
 777
 778         nr_syms = shdr.sh_size / shdr.sh_entsize;
 779
 780         memset(&sym, 0, sizeof(sym));
 781         if (!kernel) {
 782                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 783                                 elf_section_by_name(elf, &ehdr, &shdr,
 784                                                      ".gnu.prelink_undo",
 785                                                      NULL) != NULL);
 786         } else self->adjust_symbols = 0;
 787
 788         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 789                 struct symbol *f;
 790                 const char *elf_name;
 791                 char *demangled = NULL;
 792                 int is_label = elf_sym__is_label(&sym);
 793                 const char *section_name;
 794
 795                 if (!is_label && !elf_sym__is_function(&sym))
 796                         continue;
 797
 798                 sec = elf_getscn(elf, sym.st_shndx);
 799                 if (!sec)
 800                         goto out_elf_end;
 801
 802                 gelf_getshdr(sec, &shdr);
 803
 804                 if (is_label && !elf_sec__is_text(&shdr, secstrs))
 805                         continue;
 806
 807                 elf_name = elf_sym__name(&sym, symstrs);
 808                 section_name = elf_sec__name(&shdr, secstrs);
 809
 810                 if (kernel || kmodule) {
 811                         char dso_name[PATH_MAX];
 812
 813                         if (strcmp(section_name,
 814                                    curr_dso->short_name + dso_name_len) == 0)
 815                                 goto new_symbol;
 816
 817                         if (strcmp(section_name, ".text") == 0) {
 818                                 curr_map = map;
 819                                 curr_dso = self;
 820                                 goto new_symbol;
 821                         }
 822
 823                         snprintf(dso_name, sizeof(dso_name),
 824                                  "%s%s", self->short_name, section_name);
 825
 826                         curr_map = kernel_maps__find_by_dso_name(dso_name);
 827                         if (curr_map == NULL) {
 828                                 u64 start = sym.st_value;
 829
 830                                 if (kmodule)
 831                                         start += map->start + shdr.sh_offset;
 832
 833                                 curr_dso = dso__new(dso_name);
 834                                 if (curr_dso == NULL)
 835                                         goto out_elf_end;
 836                                 curr_map = map__new2(start, curr_dso);
 837                                 if (curr_map == NULL) {
 838                                         dso__delete(curr_dso);
 839                                         goto out_elf_end;
 840                                 }
 841                                 curr_map->map_ip = identity__map_ip;
 842                                 curr_map->unmap_ip = identity__map_ip;
 843                                 curr_dso->origin = DSO__ORIG_KERNEL;
 844                                 kernel_maps__insert(curr_map);
 845                                 dsos__add(curr_dso);
 846                         } else
 847                                 curr_dso = curr_map->dso;
 848
 849                         goto new_symbol;
 850                 }
 851
 852                 if (curr_dso->adjust_symbols) {
 853                         pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
 854                                   "%Lx sh_offset: %Lx\n", (u64)sym.st_value,
 855                                   (u64)shdr.sh_addr, (u64)shdr.sh_offset);
 856                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 857                 }
 858                 /*
 859                  * We need to figure out if the object was created from C++ sources
 860                  * DWARF DW_compile_unit has this, but we don't always have access
 861                  * to it...
 862                  */
 863                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
 864                 if (demangled != NULL)
 865                         elf_name = demangled;
 866 new_symbol:
 867                 f = symbol__new(sym.st_value, sym.st_size, elf_name);
 868                 free(demangled);
 869                 if (!f)
 870                         goto out_elf_end;
 871
 872                 if (filter && filter(curr_map, f))
 873                         symbol__delete(f);
 874                 else {
 875                         dso__insert_symbol(curr_dso, f);
 876                         nr++;
 877                 }
 878         }
 879
 880         /*
 881          * For misannotated, zeroed, ASM function sizes.
 882          */
 883         if (nr > 0)
 884                 dso__fixup_sym_end(self);
 885         err = nr;
 886 out_elf_end:
 887         elf_end(elf);
 888 out_close:
 889         return err;
 890 }
 891
 892 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
 893 {
 894         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
 895 }
 896
 897 bool dsos__read_build_ids(void)
 898 {
 899         bool have_build_id = false;
 900         struct dso *pos;
 901
 902         list_for_each_entry(pos, &dsos, node)
 903                 if (filename__read_build_id(pos->long_name, pos->build_id,
 904                                             sizeof(pos->build_id)) > 0) {
 905                         have_build_id     = true;
 906                         pos->has_build_id = true;
 907                 }
 908
 909         return have_build_id;
 910 }
 911
 912 /*
 913  * Align offset to 4 bytes as needed for note name and descriptor data.
 914  */
 915 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
 916
 917 int filename__read_build_id(const char *filename, void *bf, size_t size)
 918 {
 919         int fd, err = -1;
 920         GElf_Ehdr ehdr;
 921         GElf_Shdr shdr;
 922         Elf_Data *data;
 923         Elf_Scn *sec;
 924         Elf_Kind ek;
 925         void *ptr;
 926         Elf *elf;
 927
 928         if (size < BUILD_ID_SIZE)
 929                 goto out;
 930
 931         fd = open(filename, O_RDONLY);
 932         if (fd < 0)
 933                 goto out;
 934
 935         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 936         if (elf == NULL) {
 937                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
 938                 goto out_close;
 939         }
 940
 941         ek = elf_kind(elf);
 942         if (ek != ELF_K_ELF)
 943                 goto out_elf_end;
 944
 945         if (gelf_getehdr(elf, &ehdr) == NULL) {
 946                 pr_err("%s: cannot get elf header.\n", __func__);
 947                 goto out_elf_end;
 948         }
 949
 950         sec = elf_section_by_name(elf, &ehdr, &shdr,
 951                                   ".note.gnu.build-id", NULL);
 952         if (sec == NULL) {
 953                 sec = elf_section_by_name(elf, &ehdr, &shdr,
 954                                           ".notes", NULL);
 955                 if (sec == NULL)
 956                         goto out_elf_end;
 957         }
 958
 959         data = elf_getdata(sec, NULL);
 960         if (data == NULL)
 961                 goto out_elf_end;
 962
 963         ptr = data->d_buf;
 964         while (ptr < (data->d_buf + data->d_size)) {
 965                 GElf_Nhdr *nhdr = ptr;
 966                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
 967                     descsz = NOTE_ALIGN(nhdr->n_descsz);
 968                 const char *name;
 969
 970                 ptr += sizeof(*nhdr);
 971                 name = ptr;
 972                 ptr += namesz;
 973                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
 974                     nhdr->n_namesz == sizeof("GNU")) {
 975                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
 976                                 memcpy(bf, ptr, BUILD_ID_SIZE);
 977                                 err = BUILD_ID_SIZE;
 978                                 break;
 979                         }
 980                 }
 981                 ptr += descsz;
 982         }
 983 out_elf_end:
 984         elf_end(elf);
 985 out_close:
 986         close(fd);
 987 out:
 988         return err;
 989 }
 990
 991 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
 992 {
 993         int fd, err = -1;
 994
 995         if (size < BUILD_ID_SIZE)
 996                 goto out;
 997
 998         fd = open(filename, O_RDONLY);
 999         if (fd < 0)
1000                 goto out;
1001
1002         while (1) {
1003                 char bf[BUFSIZ];
1004                 GElf_Nhdr nhdr;
1005                 int namesz, descsz;
1006
1007                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1008                         break;
1009
1010                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1011                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1012                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1013                     nhdr.n_namesz == sizeof("GNU")) {
1014                         if (read(fd, bf, namesz) != namesz)
1015                                 break;
1016                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1017                                 if (read(fd, build_id,
1018                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1019                                         err = 0;
1020                                         break;
1021                                 }
1022                         } else if (read(fd, bf, descsz) != descsz)
1023                                 break;
1024                 } else {
1025                         int n = namesz + descsz;
1026                         if (read(fd, bf, n) != n)
1027                                 break;
1028                 }
1029         }
1030         close(fd);
1031 out:
1032         return err;
1033 }
1034
1035 char dso__symtab_origin(const struct dso *self)
1036 {
1037         static const char origin[] = {
1038                 [DSO__ORIG_KERNEL] =   'k',
1039                 [DSO__ORIG_JAVA_JIT] = 'j',
1040                 [DSO__ORIG_FEDORA] =   'f',
1041                 [DSO__ORIG_UBUNTU] =   'u',
1042                 [DSO__ORIG_BUILDID] =  'b',
1043                 [DSO__ORIG_DSO] =      'd',
1044                 [DSO__ORIG_KMODULE] =  'K',
1045         };
1046
1047         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1048                 return '!';
1049         return origin[self->origin];
1050 }
1051
1052 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1053 {
1054         int size = PATH_MAX;
1055         char *name;
1056         u8 build_id[BUILD_ID_SIZE];
1057         int ret = -1;
1058         int fd;
1059
1060         self->loaded = 1;
1061
1062         if (self->kernel)
1063                 return dso__load_kernel_sym(self, map, filter);
1064
1065         name = malloc(size);
1066         if (!name)
1067                 return -1;
1068
1069         self->adjust_symbols = 0;
1070
1071         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1072                 ret = dso__load_perf_map(self, map, filter);
1073                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1074                                          DSO__ORIG_NOT_FOUND;
1075                 return ret;
1076         }
1077
1078         self->origin = DSO__ORIG_FEDORA - 1;
1079
1080 more:
1081         do {
1082                 self->origin++;
1083                 switch (self->origin) {
1084                 case DSO__ORIG_FEDORA:
1085                         snprintf(name, size, "/usr/lib/debug%s.debug",
1086                                  self->long_name);
1087                         break;
1088                 case DSO__ORIG_UBUNTU:
1089                         snprintf(name, size, "/usr/lib/debug%s",
1090                                  self->long_name);
1091                         break;
1092                 case DSO__ORIG_BUILDID:
1093                         if (filename__read_build_id(self->long_name, build_id,
1094                                                     sizeof(build_id))) {
1095                                 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1096
1097                                 build_id__sprintf(build_id, sizeof(build_id),
1098                                                   build_id_hex);
1099                                 snprintf(name, size,
1100                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
1101                                         build_id_hex, build_id_hex + 2);
1102                                 if (self->has_build_id)
1103                                         goto compare_build_id;
1104                                 break;
1105                         }
1106                         self->origin++;
1107                         /* Fall thru */
1108                 case DSO__ORIG_DSO:
1109                         snprintf(name, size, "%s", self->long_name);
1110                         break;
1111
1112                 default:
1113                         goto out;
1114                 }
1115
1116                 if (self->has_build_id) {
1117                         if (filename__read_build_id(name, build_id,
1118                                                     sizeof(build_id)) < 0)
1119                                 goto more;
1120 compare_build_id:
1121                         if (!dso__build_id_equal(self, build_id))
1122                                 goto more;
1123                 }
1124
1125                 fd = open(name, O_RDONLY);
1126         } while (fd < 0);
1127
1128         ret = dso__load_sym(self, map, name, fd, filter, 0, 0);
1129         close(fd);
1130
1131         /*
1132          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1133          */
1134         if (!ret)
1135                 goto more;
1136
1137         if (ret > 0) {
1138                 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1139                 if (nr_plt > 0)
1140                         ret += nr_plt;
1141         }
1142 out:
1143         free(name);
1144         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1145                 return 0;
1146         return ret;
1147 }
1148
1149 struct map *kernel_map;
1150
1151 static void kernel_maps__insert(struct map *map)
1152 {
1153         maps__insert(&kernel_maps, map);
1154 }
1155
1156 struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp,
1157                                         symbol_filter_t filter)
1158 {
1159         struct map *map = maps__find(&kernel_maps, ip);
1160
1161         if (mapp)
1162                 *mapp = map;
1163
1164         if (map) {
1165                 ip = map->map_ip(map, ip);
1166                 return map__find_symbol(map, ip, filter);
1167         }
1168
1169         return NULL;
1170 }
1171
1172 struct map *kernel_maps__find_by_dso_name(const char *name)
1173 {
1174         struct rb_node *nd;
1175
1176         for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) {
1177                 struct map *map = rb_entry(nd, struct map, rb_node);
1178
1179                 if (map->dso && strcmp(map->dso->name, name) == 0)
1180                         return map;
1181         }
1182
1183         return NULL;
1184 }
1185
1186 static int dsos__set_modules_path_dir(char *dirname)
1187 {
1188         struct dirent *dent;
1189         DIR *dir = opendir(dirname);
1190
1191         if (!dir) {
1192                 pr_err("%s: cannot open %s dir\n", __func__, dirname);
1193                 return -1;
1194         }
1195
1196         while ((dent = readdir(dir)) != NULL) {
1197                 char path[PATH_MAX];
1198
1199                 if (dent->d_type == DT_DIR) {
1200                         if (!strcmp(dent->d_name, ".") ||
1201                             !strcmp(dent->d_name, ".."))
1202                                 continue;
1203
1204                         snprintf(path, sizeof(path), "%s/%s",
1205                                  dirname, dent->d_name);
1206                         if (dsos__set_modules_path_dir(path) < 0)
1207                                 goto failure;
1208                 } else {
1209                         char *dot = strrchr(dent->d_name, '.'),
1210                              dso_name[PATH_MAX];
1211                         struct map *map;
1212                         char *long_name;
1213
1214                         if (dot == NULL || strcmp(dot, ".ko"))
1215                                 continue;
1216                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1217                                  (int)(dot - dent->d_name), dent->d_name);
1218
1219                         strxfrchar(dso_name, '-', '_');
1220                         map = kernel_maps__find_by_dso_name(dso_name);
1221                         if (map == NULL)
1222                                 continue;
1223
1224                         snprintf(path, sizeof(path), "%s/%s",
1225                                  dirname, dent->d_name);
1226
1227                         long_name = strdup(path);
1228                         if (long_name == NULL)
1229                                 goto failure;
1230                         dso__set_long_name(map->dso, long_name);
1231                 }
1232         }
1233
1234         return 0;
1235 failure:
1236         closedir(dir);
1237         return -1;
1238 }
1239
1240 static int dsos__set_modules_path(void)
1241 {
1242         struct utsname uts;
1243         char modules_path[PATH_MAX];
1244
1245         if (uname(&uts) < 0)
1246                 return -1;
1247
1248         snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1249                  uts.release);
1250
1251         return dsos__set_modules_path_dir(modules_path);
1252 }
1253
1254 /*
1255  * Constructor variant for modules (where we know from /proc/modules where
1256  * they are loaded) and for vmlinux, where only after we load all the
1257  * symbols we'll know where it starts and ends.
1258  */
1259 static struct map *map__new2(u64 start, struct dso *dso)
1260 {
1261         struct map *self = malloc(sizeof(*self));
1262
1263         if (self != NULL) {
1264                 /*
1265                  * ->end will be filled after we load all the symbols
1266                  */
1267                 map__init(self, start, 0, 0, dso);
1268         }
1269
1270         return self;
1271 }
1272
1273 static int kernel_maps__create_module_maps(void)
1274 {
1275         char *line = NULL;
1276         size_t n;
1277         FILE *file = fopen("/proc/modules", "r");
1278         struct map *map;
1279
1280         if (file == NULL)
1281                 return -1;
1282
1283         while (!feof(file)) {
1284                 char name[PATH_MAX];
1285                 u64 start;
1286                 struct dso *dso;
1287                 char *sep;
1288                 int line_len;
1289
1290                 line_len = getline(&line, &n, file);
1291                 if (line_len < 0)
1292                         break;
1293
1294                 if (!line)
1295                         goto out_failure;
1296
1297                 line[--line_len] = '\0'; /* \n */
1298
1299                 sep = strrchr(line, 'x');
1300                 if (sep == NULL)
1301                         continue;
1302
1303                 hex2u64(sep + 1, &start);
1304
1305                 sep = strchr(line, ' ');
1306                 if (sep == NULL)
1307                         continue;
1308
1309                 *sep = '\0';
1310
1311                 snprintf(name, sizeof(name), "[%s]", line);
1312                 dso = dso__new(name);
1313
1314                 if (dso == NULL)
1315                         goto out_delete_line;
1316
1317                 map = map__new2(start, dso);
1318                 if (map == NULL) {
1319                         dso__delete(dso);
1320                         goto out_delete_line;
1321                 }
1322
1323                 snprintf(name, sizeof(name),
1324                          "/sys/module/%s/notes/.note.gnu.build-id", line);
1325                 if (sysfs__read_build_id(name, dso->build_id,
1326                                          sizeof(dso->build_id)) == 0)
1327                         dso->has_build_id = true;
1328
1329                 dso->origin = DSO__ORIG_KMODULE;
1330                 kernel_maps__insert(map);
1331                 dsos__add(dso);
1332         }
1333
1334         free(line);
1335         fclose(file);
1336
1337         return dsos__set_modules_path();
1338
1339 out_delete_line:
1340         free(line);
1341 out_failure:
1342         return -1;
1343 }
1344
1345 static int dso__load_vmlinux(struct dso *self, struct map *map,
1346                              const char *vmlinux, symbol_filter_t filter)
1347 {
1348         int err = -1, fd;
1349
1350         if (self->has_build_id) {
1351                 u8 build_id[BUILD_ID_SIZE];
1352
1353                 if (filename__read_build_id(vmlinux, build_id,
1354                                             sizeof(build_id)) < 0) {
1355                         pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1356                         return -1;
1357                 }
1358                 if (!dso__build_id_equal(self, build_id)) {
1359                         char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1360                              vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1361
1362                         build_id__sprintf(self->build_id,
1363                                           sizeof(self->build_id),
1364                                           expected_build_id);
1365                         build_id__sprintf(build_id, sizeof(build_id),
1366                                           vmlinux_build_id);
1367                         pr_debug("build_id in %s is %s while expected is %s, "
1368                                  "ignoring it\n", vmlinux, vmlinux_build_id,
1369                                  expected_build_id);
1370                         return -1;
1371                 }
1372         }
1373
1374         fd = open(vmlinux, O_RDONLY);
1375         if (fd < 0)
1376                 return -1;
1377
1378         self->loaded = 1;
1379         err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0);
1380
1381         close(fd);
1382
1383         return err;
1384 }
1385
1386 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1387                                 symbol_filter_t filter)
1388 {
1389         int err = dso__load_vmlinux(self, map, self->name, filter);
1390
1391         if (err <= 0) {
1392                 err = kernel_maps__load_kallsyms(filter);
1393                 if (err > 0)
1394                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1395         }
1396
1397         if (err > 0) {
1398                 map__fixup_start(map);
1399                 map__fixup_end(map);
1400         }
1401
1402         return err;
1403 }
1404
1405 LIST_HEAD(dsos);
1406 struct dso      *vdso;
1407
1408 const char      *vmlinux_name = "vmlinux";
1409
1410 static void dsos__add(struct dso *dso)
1411 {
1412         list_add_tail(&dso->node, &dsos);
1413 }
1414
1415 static struct dso *dsos__find(const char *name)
1416 {
1417         struct dso *pos;
1418
1419         list_for_each_entry(pos, &dsos, node)
1420                 if (strcmp(pos->name, name) == 0)
1421                         return pos;
1422         return NULL;
1423 }
1424
1425 struct dso *dsos__findnew(const char *name)
1426 {
1427         struct dso *dso = dsos__find(name);
1428
1429         if (!dso) {
1430                 dso = dso__new(name);
1431                 if (dso != NULL) {
1432                         dsos__add(dso);
1433                         dso__set_basename(dso);
1434                 }
1435         }
1436
1437         return dso;
1438 }
1439
1440 void dsos__fprintf(FILE *fp)
1441 {
1442         struct dso *pos;
1443
1444         list_for_each_entry(pos, &dsos, node)
1445                 dso__fprintf(pos, fp);
1446 }
1447
1448 size_t dsos__fprintf_buildid(FILE *fp)
1449 {
1450         struct dso *pos;
1451         size_t ret = 0;
1452
1453         list_for_each_entry(pos, &dsos, node) {
1454                 ret += dso__fprintf_buildid(pos, fp);
1455                 ret += fprintf(fp, " %s\n", pos->long_name);
1456         }
1457         return ret;
1458 }
1459
1460 static int kernel_maps__create_kernel_map(void)
1461 {
1462         struct dso *kernel = dso__new(vmlinux_name);
1463
1464         if (kernel == NULL)
1465                 return -1;
1466
1467         kernel_map = map__new2(0, kernel);
1468         if (kernel_map == NULL)
1469                 goto out_delete_kernel_dso;
1470
1471         kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
1472
1473         kernel->short_name = "[kernel]";
1474         kernel->kernel = 1;
1475         vdso = dso__new("[vdso]");
1476         if (vdso == NULL)
1477                 goto out_delete_kernel_map;
1478
1479         if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
1480                                  sizeof(kernel->build_id)) == 0)
1481                 kernel->has_build_id = true;
1482
1483         kernel_maps__insert(kernel_map);
1484         dsos__add(kernel);
1485         dsos__add(vdso);
1486
1487         return 0;
1488
1489 out_delete_kernel_map:
1490         map__delete(kernel_map);
1491         kernel_map = NULL;
1492 out_delete_kernel_dso:
1493         dso__delete(kernel);
1494         return -1;
1495 }
1496
1497 int kernel_maps__init(bool use_modules)
1498 {
1499         if (kernel_maps__create_kernel_map() < 0)
1500                 return -1;
1501
1502         if (use_modules && kernel_maps__create_module_maps() < 0)
1503                 pr_warning("Failed to load list of modules in use, "
1504                            "continuing...\n");
1505         /*
1506          * Now that we have all the maps created, just set the ->end of them:
1507          */
1508         kernel_maps__fixup_end();
1509         return 0;
1510 }
1511
1512 void symbol__init(unsigned int priv_size)
1513 {
1514         elf_version(EV_CURRENT);
1515         symbol__priv_size = priv_size;
1516 }