tools/perf/util/symbol.c

   1 #include "util.h"
   2 #include "../perf.h"
   3 #include "string.h"
   4 #include "symbol.h"
   5
   6 #include <libelf.h>
   7 #include <gelf.h>
   8 #include <elf.h>
   9
  10 const char *sym_hist_filter;
  11
  12 enum dso_origin {
  13         DSO__ORIG_KERNEL = 0,
  14         DSO__ORIG_JAVA_JIT,
  15         DSO__ORIG_FEDORA,
  16         DSO__ORIG_UBUNTU,
  17         DSO__ORIG_BUILDID,
  18         DSO__ORIG_DSO,
  19         DSO__ORIG_NOT_FOUND,
  20 };
  21
  22 static struct symbol *symbol__new(u64 start, u64 len,
  23                                   const char *name, unsigned int priv_size,
  24                                   u64 obj_start, int v)
  25 {
  26         size_t namelen = strlen(name) + 1;
  27         struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
  28
  29         if (!self)
  30                 return NULL;
  31
  32         if (v >= 2)
  33                 printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
  34                         (u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
  35
  36         self->obj_start= obj_start;
  37         self->hist = NULL;
  38         self->hist_sum = 0;
  39
  40         if (sym_hist_filter && !strcmp(name, sym_hist_filter))
  41                 self->hist = calloc(sizeof(u64), len);
  42
  43         if (priv_size) {
  44                 memset(self, 0, priv_size);
  45                 self = ((void *)self) + priv_size;
  46         }
  47         self->start = start;
  48         self->end   = len ? start + len - 1 : start;
  49         memcpy(self->name, name, namelen);
  50
  51         return self;
  52 }
  53
  54 static void symbol__delete(struct symbol *self, unsigned int priv_size)
  55 {
  56         free(((void *)self) - priv_size);
  57 }
  58
  59 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
  60 {
  61         if (!self->module)
  62                 return fprintf(fp, " %llx-%llx %s\n",
  63                        self->start, self->end, self->name);
  64         else
  65                 return fprintf(fp, " %llx-%llx %s \t[%s]\n",
  66                        self->start, self->end, self->name, self->module->name);
  67 }
  68
  69 struct dso *dso__new(const char *name, unsigned int sym_priv_size)
  70 {
  71         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
  72
  73         if (self != NULL) {
  74                 strcpy(self->name, name);
  75                 self->syms = RB_ROOT;
  76                 self->sym_priv_size = sym_priv_size;
  77                 self->find_symbol = dso__find_symbol;
  78                 self->slen_calculated = 0;
  79                 self->origin = DSO__ORIG_NOT_FOUND;
  80         }
  81
  82         return self;
  83 }
  84
  85 static void dso__delete_symbols(struct dso *self)
  86 {
  87         struct symbol *pos;
  88         struct rb_node *next = rb_first(&self->syms);
  89
  90         while (next) {
  91                 pos = rb_entry(next, struct symbol, rb_node);
  92                 next = rb_next(&pos->rb_node);
  93                 rb_erase(&pos->rb_node, &self->syms);
  94                 symbol__delete(pos, self->sym_priv_size);
  95         }
  96 }
  97
  98 void dso__delete(struct dso *self)
  99 {
 100         dso__delete_symbols(self);
 101         free(self);
 102 }
 103
 104 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
 105 {
 106         struct rb_node **p = &self->syms.rb_node;
 107         struct rb_node *parent = NULL;
 108         const u64 ip = sym->start;
 109         struct symbol *s;
 110
 111         while (*p != NULL) {
 112                 parent = *p;
 113                 s = rb_entry(parent, struct symbol, rb_node);
 114                 if (ip < s->start)
 115                         p = &(*p)->rb_left;
 116                 else
 117                         p = &(*p)->rb_right;
 118         }
 119         rb_link_node(&sym->rb_node, parent, p);
 120         rb_insert_color(&sym->rb_node, &self->syms);
 121 }
 122
 123 struct symbol *dso__find_symbol(struct dso *self, u64 ip)
 124 {
 125         struct rb_node *n;
 126
 127         if (self == NULL)
 128                 return NULL;
 129
 130         n = self->syms.rb_node;
 131
 132         while (n) {
 133                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 134
 135                 if (ip < s->start)
 136                         n = n->rb_left;
 137                 else if (ip > s->end)
 138                         n = n->rb_right;
 139                 else
 140                         return s;
 141         }
 142
 143         return NULL;
 144 }
 145
 146 size_t dso__fprintf(struct dso *self, FILE *fp)
 147 {
 148         size_t ret = fprintf(fp, "dso: %s\n", self->name);
 149
 150         struct rb_node *nd;
 151         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
 152                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 153                 ret += symbol__fprintf(pos, fp);
 154         }
 155
 156         return ret;
 157 }
 158
 159 static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
 160 {
 161         struct rb_node *nd, *prevnd;
 162         char *line = NULL;
 163         size_t n;
 164         FILE *file = fopen("/proc/kallsyms", "r");
 165         int count = 0;
 166
 167         if (file == NULL)
 168                 goto out_failure;
 169
 170         while (!feof(file)) {
 171                 u64 start;
 172                 struct symbol *sym;
 173                 int line_len, len;
 174                 char symbol_type;
 175
 176                 line_len = getline(&line, &n, file);
 177                 if (line_len < 0)
 178                         break;
 179
 180                 if (!line)
 181                         goto out_failure;
 182
 183                 line[--line_len] = '\0'; /* \n */
 184
 185                 len = hex2u64(line, &start);
 186
 187                 len++;
 188                 if (len + 2 >= line_len)
 189                         continue;
 190
 191                 symbol_type = toupper(line[len]);
 192                 /*
 193                  * We're interested only in code ('T'ext)
 194                  */
 195                 if (symbol_type != 'T' && symbol_type != 'W')
 196                         continue;
 197                 /*
 198                  * Well fix up the end later, when we have all sorted.
 199                  */
 200                 sym = symbol__new(start, 0xdead, line + len + 2,
 201                                   self->sym_priv_size, 0, v);
 202
 203                 if (sym == NULL)
 204                         goto out_delete_line;
 205
 206                 if (filter && filter(self, sym))
 207                         symbol__delete(sym, self->sym_priv_size);
 208                 else {
 209                         dso__insert_symbol(self, sym);
 210                         count++;
 211                 }
 212         }
 213
 214         /*
 215          * Now that we have all sorted out, just set the ->end of all
 216          * symbols
 217          */
 218         prevnd = rb_first(&self->syms);
 219
 220         if (prevnd == NULL)
 221                 goto out_delete_line;
 222
 223         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 224                 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
 225                               *curr = rb_entry(nd, struct symbol, rb_node);
 226
 227                 prev->end = curr->start - 1;
 228                 prevnd = nd;
 229         }
 230
 231         free(line);
 232         fclose(file);
 233
 234         return count;
 235
 236 out_delete_line:
 237         free(line);
 238 out_failure:
 239         return -1;
 240 }
 241
 242 static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int v)
 243 {
 244         char *line = NULL;
 245         size_t n;
 246         FILE *file;
 247         int nr_syms = 0;
 248
 249         file = fopen(self->name, "r");
 250         if (file == NULL)
 251                 goto out_failure;
 252
 253         while (!feof(file)) {
 254                 u64 start, size;
 255                 struct symbol *sym;
 256                 int line_len, len;
 257
 258                 line_len = getline(&line, &n, file);
 259                 if (line_len < 0)
 260                         break;
 261
 262                 if (!line)
 263                         goto out_failure;
 264
 265                 line[--line_len] = '\0'; /* \n */
 266
 267                 len = hex2u64(line, &start);
 268
 269                 len++;
 270                 if (len + 2 >= line_len)
 271                         continue;
 272
 273                 len += hex2u64(line + len, &size);
 274
 275                 len++;
 276                 if (len + 2 >= line_len)
 277                         continue;
 278
 279                 sym = symbol__new(start, size, line + len,
 280                                   self->sym_priv_size, start, v);
 281
 282                 if (sym == NULL)
 283                         goto out_delete_line;
 284
 285                 if (filter && filter(self, sym))
 286                         symbol__delete(sym, self->sym_priv_size);
 287                 else {
 288                         dso__insert_symbol(self, sym);
 289                         nr_syms++;
 290                 }
 291         }
 292
 293         free(line);
 294         fclose(file);
 295
 296         return nr_syms;
 297
 298 out_delete_line:
 299         free(line);
 300 out_failure:
 301         return -1;
 302 }
 303
 304 /**
 305  * elf_symtab__for_each_symbol - iterate thru all the symbols
 306  *
 307  * @self: struct elf_symtab instance to iterate
 308  * @idx: uint32_t idx
 309  * @sym: GElf_Sym iterator
 310  */
 311 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 312         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 313              idx < nr_syms; \
 314              idx++, gelf_getsym(syms, idx, &sym))
 315
 316 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 317 {
 318         return GELF_ST_TYPE(sym->st_info);
 319 }
 320
 321 static inline int elf_sym__is_function(const GElf_Sym *sym)
 322 {
 323         return elf_sym__type(sym) == STT_FUNC &&
 324                sym->st_name != 0 &&
 325                sym->st_shndx != SHN_UNDEF &&
 326                sym->st_size != 0;
 327 }
 328
 329 static inline int elf_sym__is_label(const GElf_Sym *sym)
 330 {
 331         return elf_sym__type(sym) == STT_NOTYPE &&
 332                 sym->st_name != 0 &&
 333                 sym->st_shndx != SHN_UNDEF &&
 334                 sym->st_shndx != SHN_ABS;
 335 }
 336
 337 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 338                                         const Elf_Data *secstrs)
 339 {
 340         return secstrs->d_buf + shdr->sh_name;
 341 }
 342
 343 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 344                                         const Elf_Data *secstrs)
 345 {
 346         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 347 }
 348
 349 static inline const char *elf_sym__name(const GElf_Sym *sym,
 350                                         const Elf_Data *symstrs)
 351 {
 352         return symstrs->d_buf + sym->st_name;
 353 }
 354
 355 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 356                                     GElf_Shdr *shp, const char *name,
 357                                     size_t *idx)
 358 {
 359         Elf_Scn *sec = NULL;
 360         size_t cnt = 1;
 361
 362         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 363                 char *str;
 364
 365                 gelf_getshdr(sec, shp);
 366                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 367                 if (!strcmp(name, str)) {
 368                         if (idx)
 369                                 *idx = cnt;
 370                         break;
 371                 }
 372                 ++cnt;
 373         }
 374
 375         return sec;
 376 }
 377
 378 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 379         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 380              idx < nr_entries; \
 381              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 382
 383 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 384         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 385              idx < nr_entries; \
 386              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 387
 388 /*
 389  * We need to check if we have a .dynsym, so that we can handle the
 390  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 391  * .dynsym or .symtab).
 392  * And always look at the original dso, not at debuginfo packages, that
 393  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 394  */
 395 static int dso__synthesize_plt_symbols(struct  dso *self, int v)
 396 {
 397         uint32_t nr_rel_entries, idx;
 398         GElf_Sym sym;
 399         u64 plt_offset;
 400         GElf_Shdr shdr_plt;
 401         struct symbol *f;
 402         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 403         Elf_Data *reldata, *syms, *symstrs;
 404         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 405         size_t dynsym_idx;
 406         GElf_Ehdr ehdr;
 407         char sympltname[1024];
 408         Elf *elf;
 409         int nr = 0, symidx, fd, err = 0;
 410
 411         fd = open(self->name, O_RDONLY);
 412         if (fd < 0)
 413                 goto out;
 414
 415         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 416         if (elf == NULL)
 417                 goto out_close;
 418
 419         if (gelf_getehdr(elf, &ehdr) == NULL)
 420                 goto out_elf_end;
 421
 422         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 423                                          ".dynsym", &dynsym_idx);
 424         if (scn_dynsym == NULL)
 425                 goto out_elf_end;
 426
 427         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 428                                           ".rela.plt", NULL);
 429         if (scn_plt_rel == NULL) {
 430                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 431                                                   ".rel.plt", NULL);
 432                 if (scn_plt_rel == NULL)
 433                         goto out_elf_end;
 434         }
 435
 436         err = -1;
 437
 438         if (shdr_rel_plt.sh_link != dynsym_idx)
 439                 goto out_elf_end;
 440
 441         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 442                 goto out_elf_end;
 443
 444         /*
 445          * Fetch the relocation section to find the idxes to the GOT
 446          * and the symbols in the .dynsym they refer to.
 447          */
 448         reldata = elf_getdata(scn_plt_rel, NULL);
 449         if (reldata == NULL)
 450                 goto out_elf_end;
 451
 452         syms = elf_getdata(scn_dynsym, NULL);
 453         if (syms == NULL)
 454                 goto out_elf_end;
 455
 456         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 457         if (scn_symstrs == NULL)
 458                 goto out_elf_end;
 459
 460         symstrs = elf_getdata(scn_symstrs, NULL);
 461         if (symstrs == NULL)
 462                 goto out_elf_end;
 463
 464         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 465         plt_offset = shdr_plt.sh_offset;
 466
 467         if (shdr_rel_plt.sh_type == SHT_RELA) {
 468                 GElf_Rela pos_mem, *pos;
 469
 470                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 471                                            nr_rel_entries) {
 472                         symidx = GELF_R_SYM(pos->r_info);
 473                         plt_offset += shdr_plt.sh_entsize;
 474                         gelf_getsym(syms, symidx, &sym);
 475                         snprintf(sympltname, sizeof(sympltname),
 476                                  "%s@plt", elf_sym__name(&sym, symstrs));
 477
 478                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 479                                         sympltname, self->sym_priv_size, 0, v);
 480                         if (!f)
 481                                 goto out_elf_end;
 482
 483                         dso__insert_symbol(self, f);
 484                         ++nr;
 485                 }
 486         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 487                 GElf_Rel pos_mem, *pos;
 488                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 489                                           nr_rel_entries) {
 490                         symidx = GELF_R_SYM(pos->r_info);
 491                         plt_offset += shdr_plt.sh_entsize;
 492                         gelf_getsym(syms, symidx, &sym);
 493                         snprintf(sympltname, sizeof(sympltname),
 494                                  "%s@plt", elf_sym__name(&sym, symstrs));
 495
 496                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 497                                         sympltname, self->sym_priv_size, 0, v);
 498                         if (!f)
 499                                 goto out_elf_end;
 500
 501                         dso__insert_symbol(self, f);
 502                         ++nr;
 503                 }
 504         }
 505
 506         err = 0;
 507 out_elf_end:
 508         elf_end(elf);
 509 out_close:
 510         close(fd);
 511
 512         if (err == 0)
 513                 return nr;
 514 out:
 515         fprintf(stderr, "%s: problems reading %s PLT info.\n",
 516                 __func__, self->name);
 517         return 0;
 518 }
 519
 520 static int dso__load_sym(struct dso *self, int fd, const char *name,
 521                          symbol_filter_t filter, int v, struct module *mod)
 522 {
 523         Elf_Data *symstrs, *secstrs;
 524         uint32_t nr_syms;
 525         int err = -1;
 526         uint32_t idx;
 527         GElf_Ehdr ehdr;
 528         GElf_Shdr shdr;
 529         Elf_Data *syms;
 530         GElf_Sym sym;
 531         Elf_Scn *sec, *sec_strndx;
 532         Elf *elf;
 533         int nr = 0, kernel = !strcmp("[kernel]", self->name);
 534
 535         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 536         if (elf == NULL) {
 537                 if (v)
 538                         fprintf(stderr, "%s: cannot read %s ELF file.\n",
 539                                 __func__, name);
 540                 goto out_close;
 541         }
 542
 543         if (gelf_getehdr(elf, &ehdr) == NULL) {
 544                 if (v)
 545                         fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 546                 goto out_elf_end;
 547         }
 548
 549         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 550         if (sec == NULL) {
 551                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 552                 if (sec == NULL)
 553                         goto out_elf_end;
 554         }
 555
 556         syms = elf_getdata(sec, NULL);
 557         if (syms == NULL)
 558                 goto out_elf_end;
 559
 560         sec = elf_getscn(elf, shdr.sh_link);
 561         if (sec == NULL)
 562                 goto out_elf_end;
 563
 564         symstrs = elf_getdata(sec, NULL);
 565         if (symstrs == NULL)
 566                 goto out_elf_end;
 567
 568         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 569         if (sec_strndx == NULL)
 570                 goto out_elf_end;
 571
 572         secstrs = elf_getdata(sec_strndx, NULL);
 573         if (secstrs == NULL)
 574                 goto out_elf_end;
 575
 576         nr_syms = shdr.sh_size / shdr.sh_entsize;
 577
 578         memset(&sym, 0, sizeof(sym));
 579         if (!kernel) {
 580                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 581                                 elf_section_by_name(elf, &ehdr, &shdr,
 582                                                      ".gnu.prelink_undo",
 583                                                      NULL) != NULL);
 584         } else self->adjust_symbols = 0;
 585
 586         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 587                 struct symbol *f;
 588                 const char *elf_name;
 589                 char *demangled;
 590                 u64 obj_start;
 591                 struct section *section = NULL;
 592                 int is_label = elf_sym__is_label(&sym);
 593                 const char *section_name;
 594
 595                 if (!is_label && !elf_sym__is_function(&sym))
 596                         continue;
 597
 598                 sec = elf_getscn(elf, sym.st_shndx);
 599                 if (!sec)
 600                         goto out_elf_end;
 601
 602                 gelf_getshdr(sec, &shdr);
 603
 604                 if (is_label && !elf_sec__is_text(&shdr, secstrs))
 605                         continue;
 606
 607                 section_name = elf_sec__name(&shdr, secstrs);
 608                 obj_start = sym.st_value;
 609
 610                 if (self->adjust_symbols) {
 611                         if (v >= 2)
 612                                 printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
 613                                         (u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
 614
 615                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 616                 }
 617
 618                 if (mod) {
 619                         section = mod->sections->find_section(mod->sections, section_name);
 620                         if (section)
 621                                 sym.st_value += section->vma;
 622                         else {
 623                                 fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
 624                                         mod->name, section_name);
 625                                 goto out_elf_end;
 626                         }
 627                 }
 628                 /*
 629                  * We need to figure out if the object was created from C++ sources
 630                  * DWARF DW_compile_unit has this, but we don't always have access
 631                  * to it...
 632                  */
 633                 elf_name = elf_sym__name(&sym, symstrs);
 634                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
 635                 if (demangled != NULL)
 636                         elf_name = demangled;
 637
 638                 f = symbol__new(sym.st_value, sym.st_size, elf_name,
 639                                 self->sym_priv_size, obj_start, v);
 640                 free(demangled);
 641                 if (!f)
 642                         goto out_elf_end;
 643
 644                 if (filter && filter(self, f))
 645                         symbol__delete(f, self->sym_priv_size);
 646                 else {
 647                         f->module = mod;
 648                         dso__insert_symbol(self, f);
 649                         nr++;
 650                 }
 651         }
 652
 653         err = nr;
 654 out_elf_end:
 655         elf_end(elf);
 656 out_close:
 657         return err;
 658 }
 659
 660 #define BUILD_ID_SIZE 128
 661
 662 static char *dso__read_build_id(struct dso *self, int v)
 663 {
 664         int i;
 665         GElf_Ehdr ehdr;
 666         GElf_Shdr shdr;
 667         Elf_Data *build_id_data;
 668         Elf_Scn *sec;
 669         char *build_id = NULL, *bid;
 670         unsigned char *raw;
 671         Elf *elf;
 672         int fd = open(self->name, O_RDONLY);
 673
 674         if (fd < 0)
 675                 goto out;
 676
 677         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 678         if (elf == NULL) {
 679                 if (v)
 680                         fprintf(stderr, "%s: cannot read %s ELF file.\n",
 681                                 __func__, self->name);
 682                 goto out_close;
 683         }
 684
 685         if (gelf_getehdr(elf, &ehdr) == NULL) {
 686                 if (v)
 687                         fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 688                 goto out_elf_end;
 689         }
 690
 691         sec = elf_section_by_name(elf, &ehdr, &shdr, ".note.gnu.build-id", NULL);
 692         if (sec == NULL)
 693                 goto out_elf_end;
 694
 695         build_id_data = elf_getdata(sec, NULL);
 696         if (build_id_data == NULL)
 697                 goto out_elf_end;
 698         build_id = malloc(BUILD_ID_SIZE);
 699         if (build_id == NULL)
 700                 goto out_elf_end;
 701         raw = build_id_data->d_buf + 16;
 702         bid = build_id;
 703
 704         for (i = 0; i < 20; ++i) {
 705                 sprintf(bid, "%02x", *raw);
 706                 ++raw;
 707                 bid += 2;
 708         }
 709         if (v >= 2)
 710                 printf("%s(%s): %s\n", __func__, self->name, build_id);
 711 out_elf_end:
 712         elf_end(elf);
 713 out_close:
 714         close(fd);
 715 out:
 716         return build_id;
 717 }
 718
 719 char dso__symtab_origin(const struct dso *self)
 720 {
 721         static const char origin[] = {
 722                 [DSO__ORIG_KERNEL] =   'k',
 723                 [DSO__ORIG_JAVA_JIT] = 'j',
 724                 [DSO__ORIG_FEDORA] =   'f',
 725                 [DSO__ORIG_UBUNTU] =   'u',
 726                 [DSO__ORIG_BUILDID] =  'b',
 727                 [DSO__ORIG_DSO] =      'd',
 728         };
 729
 730         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
 731                 return '!';
 732         return origin[self->origin];
 733 }
 734
 735 int dso__load(struct dso *self, symbol_filter_t filter, int v)
 736 {
 737         int size = PATH_MAX;
 738         char *name = malloc(size), *build_id = NULL;
 739         int ret = -1;
 740         int fd;
 741
 742         if (!name)
 743                 return -1;
 744
 745         self->adjust_symbols = 0;
 746
 747         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
 748                 ret = dso__load_perf_map(self, filter, v);
 749                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
 750                                          DSO__ORIG_NOT_FOUND;
 751                 return ret;
 752         }
 753
 754         self->origin = DSO__ORIG_FEDORA - 1;
 755
 756 more:
 757         do {
 758                 self->origin++;
 759                 switch (self->origin) {
 760                 case DSO__ORIG_FEDORA:
 761                         snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
 762                         break;
 763                 case DSO__ORIG_UBUNTU:
 764                         snprintf(name, size, "/usr/lib/debug%s", self->name);
 765                         break;
 766                 case DSO__ORIG_BUILDID:
 767                         build_id = dso__read_build_id(self, v);
 768                         if (build_id != NULL) {
 769                                 snprintf(name, size,
 770                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
 771                                         build_id, build_id + 2);
 772                                 free(build_id);
 773                                 break;
 774                         }
 775                         self->origin++;
 776                         /* Fall thru */
 777                 case DSO__ORIG_DSO:
 778                         snprintf(name, size, "%s", self->name);
 779                         break;
 780
 781                 default:
 782                         goto out;
 783                 }
 784
 785                 fd = open(name, O_RDONLY);
 786         } while (fd < 0);
 787
 788         ret = dso__load_sym(self, fd, name, filter, v, NULL);
 789         close(fd);
 790
 791         /*
 792          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
 793          */
 794         if (!ret)
 795                 goto more;
 796
 797         if (ret > 0) {
 798                 int nr_plt = dso__synthesize_plt_symbols(self, v);
 799                 if (nr_plt > 0)
 800                         ret += nr_plt;
 801         }
 802 out:
 803         free(name);
 804         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
 805                 return 0;
 806         return ret;
 807 }
 808
 809 static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
 810                              symbol_filter_t filter, int v)
 811 {
 812         struct module *mod = mod_dso__find_module(mods, name);
 813         int err = 0, fd;
 814
 815         if (mod == NULL || !mod->active)
 816                 return err;
 817
 818         fd = open(mod->path, O_RDONLY);
 819
 820         if (fd < 0)
 821                 return err;
 822
 823         err = dso__load_sym(self, fd, name, filter, v, mod);
 824         close(fd);
 825
 826         return err;
 827 }
 828
 829 int dso__load_modules(struct dso *self, symbol_filter_t filter, int v)
 830 {
 831         struct mod_dso *mods = mod_dso__new_dso("modules");
 832         struct module *pos;
 833         struct rb_node *next;
 834         int err;
 835
 836         err = mod_dso__load_modules(mods);
 837
 838         if (err <= 0)
 839                 return err;
 840
 841         /*
 842          * Iterate over modules, and load active symbols.
 843          */
 844         next = rb_first(&mods->mods);
 845         while (next) {
 846                 pos = rb_entry(next, struct module, rb_node);
 847                 err = dso__load_module(self, mods, pos->name, filter, v);
 848
 849                 if (err < 0)
 850                         break;
 851
 852                 next = rb_next(&pos->rb_node);
 853         }
 854
 855         if (err < 0) {
 856                 mod_dso__delete_modules(mods);
 857                 mod_dso__delete_self(mods);
 858         }
 859
 860         return err;
 861 }
 862
 863 static inline void dso__fill_symbol_holes(struct dso *self)
 864 {
 865         struct symbol *prev = NULL;
 866         struct rb_node *nd;
 867
 868         for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
 869                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 870
 871                 if (prev) {
 872                         u64 hole = 0;
 873                         int alias = pos->start == prev->start;
 874
 875                         if (!alias)
 876                                 hole = prev->start - pos->end - 1;
 877
 878                         if (hole || alias) {
 879                                 if (alias)
 880                                         pos->end = prev->end;
 881                                 else if (hole)
 882                                         pos->end = prev->start - 1;
 883                         }
 884                 }
 885                 prev = pos;
 886         }
 887 }
 888
 889 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
 890                              symbol_filter_t filter, int v)
 891 {
 892         int err, fd = open(vmlinux, O_RDONLY);
 893
 894         if (fd < 0)
 895                 return -1;
 896
 897         err = dso__load_sym(self, fd, vmlinux, filter, v, NULL);
 898
 899         if (err > 0)
 900                 dso__fill_symbol_holes(self);
 901
 902         close(fd);
 903
 904         return err;
 905 }
 906
 907 int dso__load_kernel(struct dso *self, const char *vmlinux,
 908                      symbol_filter_t filter, int v, int use_modules)
 909 {
 910         int err = -1;
 911
 912         if (vmlinux) {
 913                 err = dso__load_vmlinux(self, vmlinux, filter, v);
 914                 if (err > 0 && use_modules)
 915                         err = dso__load_modules(self, filter, v);
 916         }
 917
 918         if (err <= 0)
 919                 err = dso__load_kallsyms(self, filter, v);
 920
 921         if (err > 0)
 922                 self->origin = DSO__ORIG_KERNEL;
 923
 924         return err;
 925 }
 926
 927 LIST_HEAD(dsos);
 928 struct dso      *kernel_dso;
 929 struct dso      *vdso;
 930 struct dso      *hypervisor_dso;
 931
 932 const char      *vmlinux_name = "vmlinux";
 933 int             modules;
 934
 935 static void dsos__add(struct dso *dso)
 936 {
 937         list_add_tail(&dso->node, &dsos);
 938 }
 939
 940 static struct dso *dsos__find(const char *name)
 941 {
 942         struct dso *pos;
 943
 944         list_for_each_entry(pos, &dsos, node)
 945                 if (strcmp(pos->name, name) == 0)
 946                         return pos;
 947         return NULL;
 948 }
 949
 950 struct dso *dsos__findnew(const char *name)
 951 {
 952         struct dso *dso = dsos__find(name);
 953         int nr;
 954
 955         if (dso)
 956                 return dso;
 957
 958         dso = dso__new(name, 0);
 959         if (!dso)
 960                 goto out_delete_dso;
 961
 962         nr = dso__load(dso, NULL, verbose);
 963         if (nr < 0) {
 964                 eprintf("Failed to open: %s\n", name);
 965                 goto out_delete_dso;
 966         }
 967         if (!nr)
 968                 eprintf("No symbols found in: %s, maybe install a debug package?\n", name);
 969
 970         dsos__add(dso);
 971
 972         return dso;
 973
 974 out_delete_dso:
 975         dso__delete(dso);
 976         return NULL;
 977 }
 978
 979 void dsos__fprintf(FILE *fp)
 980 {
 981         struct dso *pos;
 982
 983         list_for_each_entry(pos, &dsos, node)
 984                 dso__fprintf(pos, fp);
 985 }
 986
 987 static struct symbol *vdso__find_symbol(struct dso *dso, u64 ip)
 988 {
 989         return dso__find_symbol(dso, ip);
 990 }
 991
 992 int load_kernel(void)
 993 {
 994         int err;
 995
 996         kernel_dso = dso__new("[kernel]", 0);
 997         if (!kernel_dso)
 998                 return -1;
 999
1000         err = dso__load_kernel(kernel_dso, vmlinux_name, NULL, verbose, modules);
1001         if (err <= 0) {
1002                 dso__delete(kernel_dso);
1003                 kernel_dso = NULL;
1004         } else
1005                 dsos__add(kernel_dso);
1006
1007         vdso = dso__new("[vdso]", 0);
1008         if (!vdso)
1009                 return -1;
1010
1011         vdso->find_symbol = vdso__find_symbol;
1012
1013         dsos__add(vdso);
1014
1015         hypervisor_dso = dso__new("[hypervisor]", 0);
1016         if (!hypervisor_dso)
1017                 return -1;
1018         dsos__add(hypervisor_dso);
1019
1020         return err;
1021 }
1022
1023
1024 void symbol__init(void)
1025 {
1026         elf_version(EV_CURRENT);
1027 }