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