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