tools/perf/util/symbol.c

   1 #include "util.h"
   2 #include "../perf.h"
   3 #include "string.h"
   4 #include "symbol.h"
   5
   6 #include "debug.h"
   7
   8 #include <libelf.h>
   9 #include <gelf.h>
  10 #include <elf.h>
  11
  12 const char *sym_hist_filter;
  13
  14 enum dso_origin {
  15         DSO__ORIG_KERNEL = 0,
  16         DSO__ORIG_JAVA_JIT,
  17         DSO__ORIG_FEDORA,
  18         DSO__ORIG_UBUNTU,
  19         DSO__ORIG_BUILDID,
  20         DSO__ORIG_DSO,
  21         DSO__ORIG_NOT_FOUND,
  22 };
  23
  24 static struct symbol *symbol__new(u64 start, u64 len,
  25                                   const char *name, unsigned int priv_size,
  26                                   u64 obj_start, int v)
  27 {
  28         size_t namelen = strlen(name) + 1;
  29         struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
  30
  31         if (!self)
  32                 return NULL;
  33
  34         if (v >= 2)
  35                 printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
  36                         (u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
  37
  38         self->obj_start= obj_start;
  39         self->hist = NULL;
  40         self->hist_sum = 0;
  41
  42         if (sym_hist_filter && !strcmp(name, sym_hist_filter))
  43                 self->hist = calloc(sizeof(u64), len);
  44
  45         if (priv_size) {
  46                 memset(self, 0, priv_size);
  47                 self = ((void *)self) + priv_size;
  48         }
  49         self->start = start;
  50         self->end   = len ? start + len - 1 : start;
  51         memcpy(self->name, name, namelen);
  52
  53         return self;
  54 }
  55
  56 static void symbol__delete(struct symbol *self, unsigned int priv_size)
  57 {
  58         free(((void *)self) - priv_size);
  59 }
  60
  61 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
  62 {
  63         if (!self->module)
  64                 return fprintf(fp, " %llx-%llx %s\n",
  65                        self->start, self->end, self->name);
  66         else
  67                 return fprintf(fp, " %llx-%llx %s \t[%s]\n",
  68                        self->start, self->end, self->name, self->module->name);
  69 }
  70
  71 struct dso *dso__new(const char *name, unsigned int sym_priv_size)
  72 {
  73         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
  74
  75         if (self != NULL) {
  76                 strcpy(self->name, name);
  77                 self->syms = RB_ROOT;
  78                 self->sym_priv_size = sym_priv_size;
  79                 self->find_symbol = dso__find_symbol;
  80                 self->slen_calculated = 0;
  81                 self->origin = DSO__ORIG_NOT_FOUND;
  82         }
  83
  84         return self;
  85 }
  86
  87 static void dso__delete_symbols(struct dso *self)
  88 {
  89         struct symbol *pos;
  90         struct rb_node *next = rb_first(&self->syms);
  91
  92         while (next) {
  93                 pos = rb_entry(next, struct symbol, rb_node);
  94                 next = rb_next(&pos->rb_node);
  95                 rb_erase(&pos->rb_node, &self->syms);
  96                 symbol__delete(pos, self->sym_priv_size);
  97         }
  98 }
  99
 100 void dso__delete(struct dso *self)
 101 {
 102         dso__delete_symbols(self);
 103         free(self);
 104 }
 105
 106 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
 107 {
 108         struct rb_node **p = &self->syms.rb_node;
 109         struct rb_node *parent = NULL;
 110         const u64 ip = sym->start;
 111         struct symbol *s;
 112
 113         while (*p != NULL) {
 114                 parent = *p;
 115                 s = rb_entry(parent, struct symbol, rb_node);
 116                 if (ip < s->start)
 117                         p = &(*p)->rb_left;
 118                 else
 119                         p = &(*p)->rb_right;
 120         }
 121         rb_link_node(&sym->rb_node, parent, p);
 122         rb_insert_color(&sym->rb_node, &self->syms);
 123 }
 124
 125 struct symbol *dso__find_symbol(struct dso *self, u64 ip)
 126 {
 127         struct rb_node *n;
 128
 129         if (self == NULL)
 130                 return NULL;
 131
 132         n = self->syms.rb_node;
 133
 134         while (n) {
 135                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 136
 137                 if (ip < s->start)
 138                         n = n->rb_left;
 139                 else if (ip > s->end)
 140                         n = n->rb_right;
 141                 else
 142                         return s;
 143         }
 144
 145         return NULL;
 146 }
 147
 148 size_t dso__fprintf(struct dso *self, FILE *fp)
 149 {
 150         size_t ret = fprintf(fp, "dso: %s\n", self->name);
 151
 152         struct rb_node *nd;
 153         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
 154                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 155                 ret += symbol__fprintf(pos, fp);
 156         }
 157
 158         return ret;
 159 }
 160
 161 static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
 162 {
 163         struct rb_node *nd, *prevnd;
 164         char *line = NULL;
 165         size_t n;
 166         FILE *file = fopen("/proc/kallsyms", "r");
 167         int count = 0;
 168
 169         if (file == NULL)
 170                 goto out_failure;
 171
 172         while (!feof(file)) {
 173                 u64 start;
 174                 struct symbol *sym;
 175                 int line_len, len;
 176                 char symbol_type;
 177
 178                 line_len = getline(&line, &n, file);
 179                 if (line_len < 0)
 180                         break;
 181
 182                 if (!line)
 183                         goto out_failure;
 184
 185                 line[--line_len] = '\0'; /* \n */
 186
 187                 len = hex2u64(line, &start);
 188
 189                 len++;
 190                 if (len + 2 >= line_len)
 191                         continue;
 192
 193                 symbol_type = toupper(line[len]);
 194                 /*
 195                  * We're interested only in code ('T'ext)
 196                  */
 197                 if (symbol_type != 'T' && symbol_type != 'W')
 198                         continue;
 199                 /*
 200                  * Well fix up the end later, when we have all sorted.
 201                  */
 202                 sym = symbol__new(start, 0xdead, line + len + 2,
 203                                   self->sym_priv_size, 0, v);
 204
 205                 if (sym == NULL)
 206                         goto out_delete_line;
 207
 208                 if (filter && filter(self, sym))
 209                         symbol__delete(sym, self->sym_priv_size);
 210                 else {
 211                         dso__insert_symbol(self, sym);
 212                         count++;
 213                 }
 214         }
 215
 216         /*
 217          * Now that we have all sorted out, just set the ->end of all
 218          * symbols
 219          */
 220         prevnd = rb_first(&self->syms);
 221
 222         if (prevnd == NULL)
 223                 goto out_delete_line;
 224
 225         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 226                 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
 227                               *curr = rb_entry(nd, struct symbol, rb_node);
 228
 229                 prev->end = curr->start - 1;
 230                 prevnd = nd;
 231         }
 232
 233         free(line);
 234         fclose(file);
 235
 236         return count;
 237
 238 out_delete_line:
 239         free(line);
 240 out_failure:
 241         return -1;
 242 }
 243
 244 static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int v)
 245 {
 246         char *line = NULL;
 247         size_t n;
 248         FILE *file;
 249         int nr_syms = 0;
 250
 251         file = fopen(self->name, "r");
 252         if (file == NULL)
 253                 goto out_failure;
 254
 255         while (!feof(file)) {
 256                 u64 start, size;
 257                 struct symbol *sym;
 258                 int line_len, len;
 259
 260                 line_len = getline(&line, &n, file);
 261                 if (line_len < 0)
 262                         break;
 263
 264                 if (!line)
 265                         goto out_failure;
 266
 267                 line[--line_len] = '\0'; /* \n */
 268
 269                 len = hex2u64(line, &start);
 270
 271                 len++;
 272                 if (len + 2 >= line_len)
 273                         continue;
 274
 275                 len += hex2u64(line + len, &size);
 276
 277                 len++;
 278                 if (len + 2 >= line_len)
 279                         continue;
 280
 281                 sym = symbol__new(start, size, line + len,
 282                                   self->sym_priv_size, start, v);
 283
 284                 if (sym == NULL)
 285                         goto out_delete_line;
 286
 287                 if (filter && filter(self, sym))
 288                         symbol__delete(sym, self->sym_priv_size);
 289                 else {
 290                         dso__insert_symbol(self, sym);
 291                         nr_syms++;
 292                 }
 293         }
 294
 295         free(line);
 296         fclose(file);
 297
 298         return nr_syms;
 299
 300 out_delete_line:
 301         free(line);
 302 out_failure:
 303         return -1;
 304 }
 305
 306 /**
 307  * elf_symtab__for_each_symbol - iterate thru all the symbols
 308  *
 309  * @self: struct elf_symtab instance to iterate
 310  * @idx: uint32_t idx
 311  * @sym: GElf_Sym iterator
 312  */
 313 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 314         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 315              idx < nr_syms; \
 316              idx++, gelf_getsym(syms, idx, &sym))
 317
 318 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 319 {
 320         return GELF_ST_TYPE(sym->st_info);
 321 }
 322
 323 static inline int elf_sym__is_function(const GElf_Sym *sym)
 324 {
 325         return elf_sym__type(sym) == STT_FUNC &&
 326                sym->st_name != 0 &&
 327                sym->st_shndx != SHN_UNDEF &&
 328                sym->st_size != 0;
 329 }
 330
 331 static inline int elf_sym__is_label(const GElf_Sym *sym)
 332 {
 333         return elf_sym__type(sym) == STT_NOTYPE &&
 334                 sym->st_name != 0 &&
 335                 sym->st_shndx != SHN_UNDEF &&
 336                 sym->st_shndx != SHN_ABS;
 337 }
 338
 339 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 340                                         const Elf_Data *secstrs)
 341 {
 342         return secstrs->d_buf + shdr->sh_name;
 343 }
 344
 345 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 346                                         const Elf_Data *secstrs)
 347 {
 348         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 349 }
 350
 351 static inline const char *elf_sym__name(const GElf_Sym *sym,
 352                                         const Elf_Data *symstrs)
 353 {
 354         return symstrs->d_buf + sym->st_name;
 355 }
 356
 357 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 358                                     GElf_Shdr *shp, const char *name,
 359                                     size_t *idx)
 360 {
 361         Elf_Scn *sec = NULL;
 362         size_t cnt = 1;
 363
 364         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 365                 char *str;
 366
 367                 gelf_getshdr(sec, shp);
 368                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 369                 if (!strcmp(name, str)) {
 370                         if (idx)
 371                                 *idx = cnt;
 372                         break;
 373                 }
 374                 ++cnt;
 375         }
 376
 377         return sec;
 378 }
 379
 380 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 381         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 382              idx < nr_entries; \
 383              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 384
 385 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 386         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 387              idx < nr_entries; \
 388              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 389
 390 /*
 391  * We need to check if we have a .dynsym, so that we can handle the
 392  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 393  * .dynsym or .symtab).
 394  * And always look at the original dso, not at debuginfo packages, that
 395  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 396  */
 397 static int dso__synthesize_plt_symbols(struct  dso *self, int v)
 398 {
 399         uint32_t nr_rel_entries, idx;
 400         GElf_Sym sym;
 401         u64 plt_offset;
 402         GElf_Shdr shdr_plt;
 403         struct symbol *f;
 404         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 405         Elf_Data *reldata, *syms, *symstrs;
 406         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 407         size_t dynsym_idx;
 408         GElf_Ehdr ehdr;
 409         char sympltname[1024];
 410         Elf *elf;
 411         int nr = 0, symidx, fd, err = 0;
 412
 413         fd = open(self->name, O_RDONLY);
 414         if (fd < 0)
 415                 goto out;
 416
 417         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 418         if (elf == NULL)
 419                 goto out_close;
 420
 421         if (gelf_getehdr(elf, &ehdr) == NULL)
 422                 goto out_elf_end;
 423
 424         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 425                                          ".dynsym", &dynsym_idx);
 426         if (scn_dynsym == NULL)
 427                 goto out_elf_end;
 428
 429         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 430                                           ".rela.plt", NULL);
 431         if (scn_plt_rel == NULL) {
 432                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 433                                                   ".rel.plt", NULL);
 434                 if (scn_plt_rel == NULL)
 435                         goto out_elf_end;
 436         }
 437
 438         err = -1;
 439
 440         if (shdr_rel_plt.sh_link != dynsym_idx)
 441                 goto out_elf_end;
 442
 443         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 444                 goto out_elf_end;
 445
 446         /*
 447          * Fetch the relocation section to find the idxes to the GOT
 448          * and the symbols in the .dynsym they refer to.
 449          */
 450         reldata = elf_getdata(scn_plt_rel, NULL);
 451         if (reldata == NULL)
 452                 goto out_elf_end;
 453
 454         syms = elf_getdata(scn_dynsym, NULL);
 455         if (syms == NULL)
 456                 goto out_elf_end;
 457
 458         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 459         if (scn_symstrs == NULL)
 460                 goto out_elf_end;
 461
 462         symstrs = elf_getdata(scn_symstrs, NULL);
 463         if (symstrs == NULL)
 464                 goto out_elf_end;
 465
 466         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 467         plt_offset = shdr_plt.sh_offset;
 468
 469         if (shdr_rel_plt.sh_type == SHT_RELA) {
 470                 GElf_Rela pos_mem, *pos;
 471
 472                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 473                                            nr_rel_entries) {
 474                         symidx = GELF_R_SYM(pos->r_info);
 475                         plt_offset += shdr_plt.sh_entsize;
 476                         gelf_getsym(syms, symidx, &sym);
 477                         snprintf(sympltname, sizeof(sympltname),
 478                                  "%s@plt", elf_sym__name(&sym, symstrs));
 479
 480                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 481                                         sympltname, self->sym_priv_size, 0, v);
 482                         if (!f)
 483                                 goto out_elf_end;
 484
 485                         dso__insert_symbol(self, f);
 486                         ++nr;
 487                 }
 488         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 489                 GElf_Rel pos_mem, *pos;
 490                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 491                                           nr_rel_entries) {
 492                         symidx = GELF_R_SYM(pos->r_info);
 493                         plt_offset += shdr_plt.sh_entsize;
 494                         gelf_getsym(syms, symidx, &sym);
 495                         snprintf(sympltname, sizeof(sympltname),
 496                                  "%s@plt", elf_sym__name(&sym, symstrs));
 497
 498                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 499                                         sympltname, self->sym_priv_size, 0, v);
 500                         if (!f)
 501                                 goto out_elf_end;
 502
 503                         dso__insert_symbol(self, f);
 504                         ++nr;
 505                 }
 506         }
 507
 508         err = 0;
 509 out_elf_end:
 510         elf_end(elf);
 511 out_close:
 512         close(fd);
 513
 514         if (err == 0)
 515                 return nr;
 516 out:
 517         fprintf(stderr, "%s: problems reading %s PLT info.\n",
 518                 __func__, self->name);
 519         return 0;
 520 }
 521
 522 static int dso__load_sym(struct dso *self, int fd, const char *name,
 523                          symbol_filter_t filter, int v, struct module *mod)
 524 {
 525         Elf_Data *symstrs, *secstrs;
 526         uint32_t nr_syms;
 527         int err = -1;
 528         uint32_t idx;
 529         GElf_Ehdr ehdr;
 530         GElf_Shdr shdr;
 531         Elf_Data *syms;
 532         GElf_Sym sym;
 533         Elf_Scn *sec, *sec_strndx;
 534         Elf *elf;
 535         int nr = 0, kernel = !strcmp("[kernel]", self->name);
 536
 537         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 538         if (elf == NULL) {
 539                 if (v)
 540                         fprintf(stderr, "%s: cannot read %s ELF file.\n",
 541                                 __func__, name);
 542                 goto out_close;
 543         }
 544
 545         if (gelf_getehdr(elf, &ehdr) == NULL) {
 546                 if (v)
 547                         fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 548                 goto out_elf_end;
 549         }
 550
 551         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 552         if (sec == NULL) {
 553                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 554                 if (sec == NULL)
 555                         goto out_elf_end;
 556         }
 557
 558         syms = elf_getdata(sec, NULL);
 559         if (syms == NULL)
 560                 goto out_elf_end;
 561
 562         sec = elf_getscn(elf, shdr.sh_link);
 563         if (sec == NULL)
 564                 goto out_elf_end;
 565
 566         symstrs = elf_getdata(sec, NULL);
 567         if (symstrs == NULL)
 568                 goto out_elf_end;
 569
 570         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 571         if (sec_strndx == NULL)
 572                 goto out_elf_end;
 573
 574         secstrs = elf_getdata(sec_strndx, NULL);
 575         if (secstrs == NULL)
 576                 goto out_elf_end;
 577
 578         nr_syms = shdr.sh_size / shdr.sh_entsize;
 579
 580         memset(&sym, 0, sizeof(sym));
 581         if (!kernel) {
 582                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 583                                 elf_section_by_name(elf, &ehdr, &shdr,
 584                                                      ".gnu.prelink_undo",
 585                                                      NULL) != NULL);
 586         } else self->adjust_symbols = 0;
 587
 588         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 589                 struct symbol *f;
 590                 const char *elf_name;
 591                 char *demangled;
 592                 u64 obj_start;
 593                 struct section *section = NULL;
 594                 int is_label = elf_sym__is_label(&sym);
 595                 const char *section_name;
 596
 597                 if (!is_label && !elf_sym__is_function(&sym))
 598                         continue;
 599
 600                 sec = elf_getscn(elf, sym.st_shndx);
 601                 if (!sec)
 602                         goto out_elf_end;
 603
 604                 gelf_getshdr(sec, &shdr);
 605
 606                 if (is_label && !elf_sec__is_text(&shdr, secstrs))
 607                         continue;
 608
 609                 section_name = elf_sec__name(&shdr, secstrs);
 610                 obj_start = sym.st_value;
 611
 612                 if (self->adjust_symbols) {
 613                         if (v >= 2)
 614                                 printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
 615                                         (u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
 616
 617                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 618                 }
 619
 620                 if (mod) {
 621                         section = mod->sections->find_section(mod->sections, section_name);
 622                         if (section)
 623                                 sym.st_value += section->vma;
 624                         else {
 625                                 fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
 626                                         mod->name, section_name);
 627                                 goto out_elf_end;
 628                         }
 629                 }
 630                 /*
 631                  * We need to figure out if the object was created from C++ sources
 632                  * DWARF DW_compile_unit has this, but we don't always have access
 633                  * to it...
 634                  */
 635                 elf_name = elf_sym__name(&sym, symstrs);
 636                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
 637                 if (demangled != NULL)
 638                         elf_name = demangled;
 639
 640                 f = symbol__new(sym.st_value, sym.st_size, elf_name,
 641                                 self->sym_priv_size, obj_start, v);
 642                 free(demangled);
 643                 if (!f)
 644                         goto out_elf_end;
 645
 646                 if (filter && filter(self, f))
 647                         symbol__delete(f, self->sym_priv_size);
 648                 else {
 649                         f->module = mod;
 650                         dso__insert_symbol(self, f);
 651                         nr++;
 652                 }
 653         }
 654
 655         err = nr;
 656 out_elf_end:
 657         elf_end(elf);
 658 out_close:
 659         return err;
 660 }
 661
 662 #define BUILD_ID_SIZE 128
 663
 664 static char *dso__read_build_id(struct dso *self, int v)
 665 {
 666         int i;
 667         GElf_Ehdr ehdr;
 668         GElf_Shdr shdr;
 669         Elf_Data *build_id_data;
 670         Elf_Scn *sec;
 671         char *build_id = NULL, *bid;
 672         unsigned char *raw;
 673         Elf *elf;
 674         int fd = open(self->name, O_RDONLY);
 675
 676         if (fd < 0)
 677                 goto out;
 678
 679         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 680         if (elf == NULL) {
 681                 if (v)
 682                         fprintf(stderr, "%s: cannot read %s ELF file.\n",
 683                                 __func__, self->name);
 684                 goto out_close;
 685         }
 686
 687         if (gelf_getehdr(elf, &ehdr) == NULL) {
 688                 if (v)
 689                         fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 690                 goto out_elf_end;
 691         }
 692
 693         sec = elf_section_by_name(elf, &ehdr, &shdr, ".note.gnu.build-id", NULL);
 694         if (sec == NULL)
 695                 goto out_elf_end;
 696
 697         build_id_data = elf_getdata(sec, NULL);
 698         if (build_id_data == NULL)
 699                 goto out_elf_end;
 700         build_id = malloc(BUILD_ID_SIZE);
 701         if (build_id == NULL)
 702                 goto out_elf_end;
 703         raw = build_id_data->d_buf + 16;
 704         bid = build_id;
 705
 706         for (i = 0; i < 20; ++i) {
 707                 sprintf(bid, "%02x", *raw);
 708                 ++raw;
 709                 bid += 2;
 710         }
 711         if (v >= 2)
 712                 printf("%s(%s): %s\n", __func__, self->name, build_id);
 713 out_elf_end:
 714         elf_end(elf);
 715 out_close:
 716         close(fd);
 717 out:
 718         return build_id;
 719 }
 720
 721 char dso__symtab_origin(const struct dso *self)
 722 {
 723         static const char origin[] = {
 724                 [DSO__ORIG_KERNEL] =   'k',
 725                 [DSO__ORIG_JAVA_JIT] = 'j',
 726                 [DSO__ORIG_FEDORA] =   'f',
 727                 [DSO__ORIG_UBUNTU] =   'u',
 728                 [DSO__ORIG_BUILDID] =  'b',
 729                 [DSO__ORIG_DSO] =      'd',
 730         };
 731
 732         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
 733                 return '!';
 734         return origin[self->origin];
 735 }
 736
 737 int dso__load(struct dso *self, symbol_filter_t filter, int v)
 738 {
 739         int size = PATH_MAX;
 740         char *name = malloc(size), *build_id = NULL;
 741         int ret = -1;
 742         int fd;
 743
 744         if (!name)
 745                 return -1;
 746
 747         self->adjust_symbols = 0;
 748
 749         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
 750                 ret = dso__load_perf_map(self, filter, v);
 751                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
 752                                          DSO__ORIG_NOT_FOUND;
 753                 return ret;
 754         }
 755
 756         self->origin = DSO__ORIG_FEDORA - 1;
 757
 758 more:
 759         do {
 760                 self->origin++;
 761                 switch (self->origin) {
 762                 case DSO__ORIG_FEDORA:
 763                         snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
 764                         break;
 765                 case DSO__ORIG_UBUNTU:
 766                         snprintf(name, size, "/usr/lib/debug%s", self->name);
 767                         break;
 768                 case DSO__ORIG_BUILDID:
 769                         build_id = dso__read_build_id(self, v);
 770                         if (build_id != NULL) {
 771                                 snprintf(name, size,
 772                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
 773                                         build_id, build_id + 2);
 774                                 free(build_id);
 775                                 break;
 776                         }
 777                         self->origin++;
 778                         /* Fall thru */
 779                 case DSO__ORIG_DSO:
 780                         snprintf(name, size, "%s", self->name);
 781                         break;
 782
 783                 default:
 784                         goto out;
 785                 }
 786
 787                 fd = open(name, O_RDONLY);
 788         } while (fd < 0);
 789
 790         ret = dso__load_sym(self, fd, name, filter, v, NULL);
 791         close(fd);
 792
 793         /*
 794          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
 795          */
 796         if (!ret)
 797                 goto more;
 798
 799         if (ret > 0) {
 800                 int nr_plt = dso__synthesize_plt_symbols(self, v);
 801                 if (nr_plt > 0)
 802                         ret += nr_plt;
 803         }
 804 out:
 805         free(name);
 806         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
 807                 return 0;
 808         return ret;
 809 }
 810
 811 static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
 812                              symbol_filter_t filter, int v)
 813 {
 814         struct module *mod = mod_dso__find_module(mods, name);
 815         int err = 0, fd;
 816
 817         if (mod == NULL || !mod->active)
 818                 return err;
 819
 820         fd = open(mod->path, O_RDONLY);
 821
 822         if (fd < 0)
 823                 return err;
 824
 825         err = dso__load_sym(self, fd, name, filter, v, mod);
 826         close(fd);
 827
 828         return err;
 829 }
 830
 831 int dso__load_modules(struct dso *self, symbol_filter_t filter, int v)
 832 {
 833         struct mod_dso *mods = mod_dso__new_dso("modules");
 834         struct module *pos;
 835         struct rb_node *next;
 836         int err;
 837
 838         err = mod_dso__load_modules(mods);
 839
 840         if (err <= 0)
 841                 return err;
 842
 843         /*
 844          * Iterate over modules, and load active symbols.
 845          */
 846         next = rb_first(&mods->mods);
 847         while (next) {
 848                 pos = rb_entry(next, struct module, rb_node);
 849                 err = dso__load_module(self, mods, pos->name, filter, v);
 850
 851                 if (err < 0)
 852                         break;
 853
 854                 next = rb_next(&pos->rb_node);
 855         }
 856
 857         if (err < 0) {
 858                 mod_dso__delete_modules(mods);
 859                 mod_dso__delete_self(mods);
 860         }
 861
 862         return err;
 863 }
 864
 865 static inline void dso__fill_symbol_holes(struct dso *self)
 866 {
 867         struct symbol *prev = NULL;
 868         struct rb_node *nd;
 869
 870         for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
 871                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 872
 873                 if (prev) {
 874                         u64 hole = 0;
 875                         int alias = pos->start == prev->start;
 876
 877                         if (!alias)
 878                                 hole = prev->start - pos->end - 1;
 879
 880                         if (hole || alias) {
 881                                 if (alias)
 882                                         pos->end = prev->end;
 883                                 else if (hole)
 884                                         pos->end = prev->start - 1;
 885                         }
 886                 }
 887                 prev = pos;
 888         }
 889 }
 890
 891 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
 892                              symbol_filter_t filter, int v)
 893 {
 894         int err, fd = open(vmlinux, O_RDONLY);
 895
 896         if (fd < 0)
 897                 return -1;
 898
 899         err = dso__load_sym(self, fd, vmlinux, filter, v, NULL);
 900
 901         if (err > 0)
 902                 dso__fill_symbol_holes(self);
 903
 904         close(fd);
 905
 906         return err;
 907 }
 908
 909 int dso__load_kernel(struct dso *self, const char *vmlinux,
 910                      symbol_filter_t filter, int v, int use_modules)
 911 {
 912         int err = -1;
 913
 914         if (vmlinux) {
 915                 err = dso__load_vmlinux(self, vmlinux, filter, v);
 916                 if (err > 0 && use_modules)
 917                         err = dso__load_modules(self, filter, v);
 918         }
 919
 920         if (err <= 0)
 921                 err = dso__load_kallsyms(self, filter, v);
 922
 923         if (err > 0)
 924                 self->origin = DSO__ORIG_KERNEL;
 925
 926         return err;
 927 }
 928
 929 LIST_HEAD(dsos);
 930 struct dso      *kernel_dso;
 931 struct dso      *vdso;
 932 struct dso      *hypervisor_dso;
 933
 934 const char      *vmlinux_name = "vmlinux";
 935 int             modules;
 936
 937 static void dsos__add(struct dso *dso)
 938 {
 939         list_add_tail(&dso->node, &dsos);
 940 }
 941
 942 static struct dso *dsos__find(const char *name)
 943 {
 944         struct dso *pos;
 945
 946         list_for_each_entry(pos, &dsos, node)
 947                 if (strcmp(pos->name, name) == 0)
 948                         return pos;
 949         return NULL;
 950 }
 951
 952 struct dso *dsos__findnew(const char *name)
 953 {
 954         struct dso *dso = dsos__find(name);
 955         int nr;
 956
 957         if (dso)
 958                 return dso;
 959
 960         dso = dso__new(name, 0);
 961         if (!dso)
 962                 goto out_delete_dso;
 963
 964         nr = dso__load(dso, NULL, verbose);
 965         if (nr < 0) {
 966                 eprintf("Failed to open: %s\n", name);
 967                 goto out_delete_dso;
 968         }
 969         if (!nr)
 970                 eprintf("No symbols found in: %s, maybe install a debug package?\n", name);
 971
 972         dsos__add(dso);
 973
 974         return dso;
 975
 976 out_delete_dso:
 977         dso__delete(dso);
 978         return NULL;
 979 }
 980
 981 void dsos__fprintf(FILE *fp)
 982 {
 983         struct dso *pos;
 984
 985         list_for_each_entry(pos, &dsos, node)
 986                 dso__fprintf(pos, fp);
 987 }
 988
 989 static struct symbol *vdso__find_symbol(struct dso *dso, u64 ip)
 990 {
 991         return dso__find_symbol(dso, ip);
 992 }
 993
 994 int load_kernel(void)
 995 {
 996         int err;
 997
 998         kernel_dso = dso__new("[kernel]", 0);
 999         if (!kernel_dso)
1000                 return -1;
1001
1002         err = dso__load_kernel(kernel_dso, vmlinux_name, NULL, verbose, modules);
1003         if (err <= 0) {
1004                 dso__delete(kernel_dso);
1005                 kernel_dso = NULL;
1006         } else
1007                 dsos__add(kernel_dso);
1008
1009         vdso = dso__new("[vdso]", 0);
1010         if (!vdso)
1011                 return -1;
1012
1013         vdso->find_symbol = vdso__find_symbol;
1014
1015         dsos__add(vdso);
1016
1017         hypervisor_dso = dso__new("[hypervisor]", 0);
1018         if (!hypervisor_dso)
1019                 return -1;
1020         dsos__add(hypervisor_dso);
1021
1022         return err;
1023 }
1024
1025
1026 void symbol__init(void)
1027 {
1028         elf_version(EV_CURRENT);
1029 }