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