SAFE public projects git trees. - safe/jmp/linux-2.6/blob - tools/perf/util/symbol.c

   1 #include "util.h"
   2 #include "../perf.h"
   3 #include "string.h"
   4 #include "symbol.h"
   5 #include "thread.h"
   6
   7 #include "debug.h"
   8
   9 #include <asm/bug.h>
  10 #include <libelf.h>
  11 #include <gelf.h>
  12 #include <elf.h>
  13 #include <limits.h>
  14 #include <sys/utsname.h>
  15
  16 #ifndef NT_GNU_BUILD_ID
  17 #define NT_GNU_BUILD_ID 3
  18 #endif
  19
  20 enum dso_origin {
  21         DSO__ORIG_KERNEL = 0,
  22         DSO__ORIG_JAVA_JIT,
  23         DSO__ORIG_FEDORA,
  24         DSO__ORIG_UBUNTU,
  25         DSO__ORIG_BUILDID,
  26         DSO__ORIG_DSO,
  27         DSO__ORIG_KMODULE,
  28         DSO__ORIG_NOT_FOUND,
  29 };
  30
  31 static void dsos__add(struct list_head *head, struct dso *dso);
  32 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
  33 static void kernel_maps__insert(struct map *map);
  34 static int dso__load_kernel_sym(struct dso *self, struct map *map,
  35                                 symbol_filter_t filter);
  36 unsigned int symbol__priv_size;
  37 static int vmlinux_path__nr_entries;
  38 static char **vmlinux_path;
  39 static struct map *kernel_map__functions;
  40
  41 static struct symbol_conf symbol_conf__defaults = {
  42         .use_modules      = true,
  43         .try_vmlinux_path = true,
  44 };
  45
  46 static struct rb_root kernel_maps__functions;
  47
  48 bool dso__loaded(const struct dso *self, enum map_type type)
  49 {
  50         return self->loaded & (1 << type);
  51 }
  52
  53 static void dso__set_loaded(struct dso *self, enum map_type type)
  54 {
  55         self->loaded |= (1 << type);
  56 }
  57
  58 static void symbols__fixup_end(struct rb_root *self)
  59 {
  60         struct rb_node *nd, *prevnd = rb_first(self);
  61         struct symbol *curr, *prev;
  62
  63         if (prevnd == NULL)
  64                 return;
  65
  66         curr = rb_entry(prevnd, struct symbol, rb_node);
  67
  68         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  69                 prev = curr;
  70                 curr = rb_entry(nd, struct symbol, rb_node);
  71
  72                 if (prev->end == prev->start)
  73                         prev->end = curr->start - 1;
  74         }
  75
  76         /* Last entry */
  77         if (curr->end == curr->start)
  78                 curr->end = roundup(curr->start, 4096);
  79 }
  80
  81 static void kernel_maps__fixup_end(void)
  82 {
  83         struct map *prev, *curr;
  84         struct rb_node *nd, *prevnd = rb_first(&kernel_maps__functions);
  85
  86         if (prevnd == NULL)
  87                 return;
  88
  89         curr = rb_entry(prevnd, struct map, rb_node);
  90
  91         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  92                 prev = curr;
  93                 curr = rb_entry(nd, struct map, rb_node);
  94                 prev->end = curr->start - 1;
  95         }
  96
  97         /*
  98          * We still haven't the actual symbols, so guess the
  99          * last map final address.
 100          */
 101         curr->end = ~0UL;
 102 }
 103
 104 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
 105 {
 106         size_t namelen = strlen(name) + 1;
 107         struct symbol *self = zalloc(symbol__priv_size +
 108                                      sizeof(*self) + namelen);
 109         if (self == NULL)
 110                 return NULL;
 111
 112         if (symbol__priv_size)
 113                 self = ((void *)self) + symbol__priv_size;
 114
 115         self->start = start;
 116         self->end   = len ? start + len - 1 : start;
 117
 118         pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
 119
 120         memcpy(self->name, name, namelen);
 121
 122         return self;
 123 }
 124
 125 static void symbol__delete(struct symbol *self)
 126 {
 127         free(((void *)self) - symbol__priv_size);
 128 }
 129
 130 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 131 {
 132         return fprintf(fp, " %llx-%llx %s\n",
 133                        self->start, self->end, self->name);
 134 }
 135
 136 static void dso__set_long_name(struct dso *self, char *name)
 137 {
 138         if (name == NULL)
 139                 return;
 140         self->long_name = name;
 141         self->long_name_len = strlen(name);
 142 }
 143
 144 static void dso__set_basename(struct dso *self)
 145 {
 146         self->short_name = basename(self->long_name);
 147 }
 148
 149 struct dso *dso__new(const char *name)
 150 {
 151         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 152
 153         if (self != NULL) {
 154                 strcpy(self->name, name);
 155                 dso__set_long_name(self, self->name);
 156                 self->short_name = self->name;
 157                 self->functions = RB_ROOT;
 158                 self->find_function = dso__find_function;
 159                 self->slen_calculated = 0;
 160                 self->origin = DSO__ORIG_NOT_FOUND;
 161                 self->loaded = 0;
 162                 self->has_build_id = 0;
 163         }
 164
 165         return self;
 166 }
 167
 168 static void symbols__delete(struct rb_root *self)
 169 {
 170         struct symbol *pos;
 171         struct rb_node *next = rb_first(self);
 172
 173         while (next) {
 174                 pos = rb_entry(next, struct symbol, rb_node);
 175                 next = rb_next(&pos->rb_node);
 176                 rb_erase(&pos->rb_node, self);
 177                 symbol__delete(pos);
 178         }
 179 }
 180
 181 void dso__delete(struct dso *self)
 182 {
 183         symbols__delete(&self->functions);
 184         if (self->long_name != self->name)
 185                 free(self->long_name);
 186         free(self);
 187 }
 188
 189 void dso__set_build_id(struct dso *self, void *build_id)
 190 {
 191         memcpy(self->build_id, build_id, sizeof(self->build_id));
 192         self->has_build_id = 1;
 193 }
 194
 195 static void symbols__insert(struct rb_root *self, struct symbol *sym)
 196 {
 197         struct rb_node **p = &self->rb_node;
 198         struct rb_node *parent = NULL;
 199         const u64 ip = sym->start;
 200         struct symbol *s;
 201
 202         while (*p != NULL) {
 203                 parent = *p;
 204                 s = rb_entry(parent, struct symbol, rb_node);
 205                 if (ip < s->start)
 206                         p = &(*p)->rb_left;
 207                 else
 208                         p = &(*p)->rb_right;
 209         }
 210         rb_link_node(&sym->rb_node, parent, p);
 211         rb_insert_color(&sym->rb_node, self);
 212 }
 213
 214 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
 215 {
 216         struct rb_node *n;
 217
 218         if (self == NULL)
 219                 return NULL;
 220
 221         n = self->rb_node;
 222
 223         while (n) {
 224                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 225
 226                 if (ip < s->start)
 227                         n = n->rb_left;
 228                 else if (ip > s->end)
 229                         n = n->rb_right;
 230                 else
 231                         return s;
 232         }
 233
 234         return NULL;
 235 }
 236
 237 struct symbol *dso__find_function(struct dso *self, u64 ip)
 238 {
 239         return symbols__find(&self->functions, ip);
 240 }
 241
 242 int build_id__sprintf(u8 *self, int len, char *bf)
 243 {
 244         char *bid = bf;
 245         u8 *raw = self;
 246         int i;
 247
 248         for (i = 0; i < len; ++i) {
 249                 sprintf(bid, "%02x", *raw);
 250                 ++raw;
 251                 bid += 2;
 252         }
 253
 254         return raw - self;
 255 }
 256
 257 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 258 {
 259         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 260
 261         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 262         return fprintf(fp, "%s", sbuild_id);
 263 }
 264
 265 size_t dso__fprintf(struct dso *self, FILE *fp)
 266 {
 267         struct rb_node *nd;
 268         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 269
 270         ret += dso__fprintf_buildid(self, fp);
 271         ret += fprintf(fp, ")\nFunctions:\n");
 272
 273         for (nd = rb_first(&self->functions); nd; nd = rb_next(nd)) {
 274                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 275                 ret += symbol__fprintf(pos, fp);
 276         }
 277
 278         return ret;
 279 }
 280
 281 /*
 282  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 283  * so that we can in the next step set the symbol ->end address and then
 284  * call kernel_maps__split_kallsyms.
 285  */
 286 static int kernel_maps__load_all_kallsyms(void)
 287 {
 288         char *line = NULL;
 289         size_t n;
 290         FILE *file = fopen("/proc/kallsyms", "r");
 291
 292         if (file == NULL)
 293                 goto out_failure;
 294
 295         while (!feof(file)) {
 296                 u64 start;
 297                 struct symbol *sym;
 298                 int line_len, len;
 299                 char symbol_type;
 300                 char *symbol_name;
 301
 302                 line_len = getline(&line, &n, file);
 303                 if (line_len < 0)
 304                         break;
 305
 306                 if (!line)
 307                         goto out_failure;
 308
 309                 line[--line_len] = '\0'; /* \n */
 310
 311                 len = hex2u64(line, &start);
 312
 313                 len++;
 314                 if (len + 2 >= line_len)
 315                         continue;
 316
 317                 symbol_type = toupper(line[len]);
 318                 /*
 319                  * We're interested only in code ('T'ext)
 320                  */
 321                 if (symbol_type != 'T' && symbol_type != 'W')
 322                         continue;
 323
 324                 symbol_name = line + len + 2;
 325                 /*
 326                  * Will fix up the end later, when we have all symbols sorted.
 327                  */
 328                 sym = symbol__new(start, 0, symbol_name);
 329
 330                 if (sym == NULL)
 331                         goto out_delete_line;
 332
 333                 /*
 334                  * We will pass the symbols to the filter later, in
 335                  * kernel_maps__split_kallsyms, when we have split the
 336                  * maps per module
 337                  */
 338                 symbols__insert(&kernel_map__functions->dso->functions, sym);
 339         }
 340
 341         free(line);
 342         fclose(file);
 343
 344         return 0;
 345
 346 out_delete_line:
 347         free(line);
 348 out_failure:
 349         return -1;
 350 }
 351
 352 /*
 353  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 354  * kernel range is broken in several maps, named [kernel].N, as we don't have
 355  * the original ELF section names vmlinux have.
 356  */
 357 static int kernel_maps__split_kallsyms(symbol_filter_t filter)
 358 {
 359         struct map *map = kernel_map__functions;
 360         struct symbol *pos;
 361         int count = 0;
 362         struct rb_node *next = rb_first(&kernel_map__functions->dso->functions);
 363         int kernel_range = 0;
 364
 365         while (next) {
 366                 char *module;
 367
 368                 pos = rb_entry(next, struct symbol, rb_node);
 369                 next = rb_next(&pos->rb_node);
 370
 371                 module = strchr(pos->name, '\t');
 372                 if (module) {
 373                         *module++ = '\0';
 374
 375                         if (strcmp(map->dso->name, module)) {
 376                                 map = kernel_maps__find_by_dso_name(module);
 377                                 if (!map) {
 378                                         pr_err("/proc/{kallsyms,modules} "
 379                                                "inconsistency!\n");
 380                                         return -1;
 381                                 }
 382                         }
 383                         /*
 384                          * So that we look just like we get from .ko files,
 385                          * i.e. not prelinked, relative to map->start.
 386                          */
 387                         pos->start = map->map_ip(map, pos->start);
 388                         pos->end   = map->map_ip(map, pos->end);
 389                 } else if (map != kernel_map__functions) {
 390                         char dso_name[PATH_MAX];
 391                         struct dso *dso;
 392
 393                         snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
 394                                  kernel_range++);
 395
 396                         dso = dso__new(dso_name);
 397                         if (dso == NULL)
 398                                 return -1;
 399
 400                         map = map__new2(pos->start, dso, MAP__FUNCTION);
 401                         if (map == NULL) {
 402                                 dso__delete(dso);
 403                                 return -1;
 404                         }
 405
 406                         map->map_ip = map->unmap_ip = identity__map_ip;
 407                         kernel_maps__insert(map);
 408                         ++kernel_range;
 409                 }
 410
 411                 if (filter && filter(map, pos)) {
 412                         rb_erase(&pos->rb_node, &kernel_map__functions->dso->functions);
 413                         symbol__delete(pos);
 414                 } else {
 415                         if (map != kernel_map__functions) {
 416                                 rb_erase(&pos->rb_node,
 417                                          &kernel_map__functions->dso->functions);
 418                                 symbols__insert(&map->dso->functions, pos);
 419                         }
 420                         count++;
 421                 }
 422         }
 423
 424         return count;
 425 }
 426
 427
 428 static int kernel_maps__load_kallsyms(symbol_filter_t filter)
 429 {
 430         if (kernel_maps__load_all_kallsyms())
 431                 return -1;
 432
 433         symbols__fixup_end(&kernel_map__functions->dso->functions);
 434         kernel_map__functions->dso->origin = DSO__ORIG_KERNEL;
 435
 436         return kernel_maps__split_kallsyms(filter);
 437 }
 438
 439 size_t kernel_maps__fprintf(FILE *fp)
 440 {
 441         size_t printed = fprintf(fp, "Kernel maps:\n");
 442         struct rb_node *nd;
 443
 444         for (nd = rb_first(&kernel_maps__functions); nd; nd = rb_next(nd)) {
 445                 struct map *pos = rb_entry(nd, struct map, rb_node);
 446
 447                 printed += fprintf(fp, "Map:");
 448                 printed += map__fprintf(pos, fp);
 449                 if (verbose > 1) {
 450                         printed += dso__fprintf(pos->dso, fp);
 451                         printed += fprintf(fp, "--\n");
 452                 }
 453         }
 454
 455         return printed + fprintf(fp, "END kernel maps\n");
 456 }
 457
 458 static int dso__load_perf_map(struct dso *self, struct map *map,
 459                               symbol_filter_t filter)
 460 {
 461         char *line = NULL;
 462         size_t n;
 463         FILE *file;
 464         int nr_syms = 0;
 465
 466         file = fopen(self->long_name, "r");
 467         if (file == NULL)
 468                 goto out_failure;
 469
 470         while (!feof(file)) {
 471                 u64 start, size;
 472                 struct symbol *sym;
 473                 int line_len, len;
 474
 475                 line_len = getline(&line, &n, file);
 476                 if (line_len < 0)
 477                         break;
 478
 479                 if (!line)
 480                         goto out_failure;
 481
 482                 line[--line_len] = '\0'; /* \n */
 483
 484                 len = hex2u64(line, &start);
 485
 486                 len++;
 487                 if (len + 2 >= line_len)
 488                         continue;
 489
 490                 len += hex2u64(line + len, &size);
 491
 492                 len++;
 493                 if (len + 2 >= line_len)
 494                         continue;
 495
 496                 sym = symbol__new(start, size, line + len);
 497
 498                 if (sym == NULL)
 499                         goto out_delete_line;
 500
 501                 if (filter && filter(map, sym))
 502                         symbol__delete(sym);
 503                 else {
 504                         symbols__insert(&self->functions, sym);
 505                         nr_syms++;
 506                 }
 507         }
 508
 509         free(line);
 510         fclose(file);
 511
 512         return nr_syms;
 513
 514 out_delete_line:
 515         free(line);
 516 out_failure:
 517         return -1;
 518 }
 519
 520 /**
 521  * elf_symtab__for_each_symbol - iterate thru all the symbols
 522  *
 523  * @self: struct elf_symtab instance to iterate
 524  * @idx: uint32_t idx
 525  * @sym: GElf_Sym iterator
 526  */
 527 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 528         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 529              idx < nr_syms; \
 530              idx++, gelf_getsym(syms, idx, &sym))
 531
 532 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 533 {
 534         return GELF_ST_TYPE(sym->st_info);
 535 }
 536
 537 static inline int elf_sym__is_function(const GElf_Sym *sym)
 538 {
 539         return elf_sym__type(sym) == STT_FUNC &&
 540                sym->st_name != 0 &&
 541                sym->st_shndx != SHN_UNDEF;
 542 }
 543
 544 static inline int elf_sym__is_label(const GElf_Sym *sym)
 545 {
 546         return elf_sym__type(sym) == STT_NOTYPE &&
 547                 sym->st_name != 0 &&
 548                 sym->st_shndx != SHN_UNDEF &&
 549                 sym->st_shndx != SHN_ABS;
 550 }
 551
 552 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 553                                         const Elf_Data *secstrs)
 554 {
 555         return secstrs->d_buf + shdr->sh_name;
 556 }
 557
 558 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 559                                         const Elf_Data *secstrs)
 560 {
 561         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 562 }
 563
 564 static inline const char *elf_sym__name(const GElf_Sym *sym,
 565                                         const Elf_Data *symstrs)
 566 {
 567         return symstrs->d_buf + sym->st_name;
 568 }
 569
 570 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 571                                     GElf_Shdr *shp, const char *name,
 572                                     size_t *idx)
 573 {
 574         Elf_Scn *sec = NULL;
 575         size_t cnt = 1;
 576
 577         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 578                 char *str;
 579
 580                 gelf_getshdr(sec, shp);
 581                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 582                 if (!strcmp(name, str)) {
 583                         if (idx)
 584                                 *idx = cnt;
 585                         break;
 586                 }
 587                 ++cnt;
 588         }
 589
 590         return sec;
 591 }
 592
 593 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 594         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 595              idx < nr_entries; \
 596              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 597
 598 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 599         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 600              idx < nr_entries; \
 601              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 602
 603 /*
 604  * We need to check if we have a .dynsym, so that we can handle the
 605  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 606  * .dynsym or .symtab).
 607  * And always look at the original dso, not at debuginfo packages, that
 608  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 609  */
 610 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 611                                        symbol_filter_t filter)
 612 {
 613         uint32_t nr_rel_entries, idx;
 614         GElf_Sym sym;
 615         u64 plt_offset;
 616         GElf_Shdr shdr_plt;
 617         struct symbol *f;
 618         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 619         Elf_Data *reldata, *syms, *symstrs;
 620         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 621         size_t dynsym_idx;
 622         GElf_Ehdr ehdr;
 623         char sympltname[1024];
 624         Elf *elf;
 625         int nr = 0, symidx, fd, err = 0;
 626
 627         fd = open(self->long_name, O_RDONLY);
 628         if (fd < 0)
 629                 goto out;
 630
 631         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 632         if (elf == NULL)
 633                 goto out_close;
 634
 635         if (gelf_getehdr(elf, &ehdr) == NULL)
 636                 goto out_elf_end;
 637
 638         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 639                                          ".dynsym", &dynsym_idx);
 640         if (scn_dynsym == NULL)
 641                 goto out_elf_end;
 642
 643         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 644                                           ".rela.plt", NULL);
 645         if (scn_plt_rel == NULL) {
 646                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 647                                                   ".rel.plt", NULL);
 648                 if (scn_plt_rel == NULL)
 649                         goto out_elf_end;
 650         }
 651
 652         err = -1;
 653
 654         if (shdr_rel_plt.sh_link != dynsym_idx)
 655                 goto out_elf_end;
 656
 657         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 658                 goto out_elf_end;
 659
 660         /*
 661          * Fetch the relocation section to find the idxes to the GOT
 662          * and the symbols in the .dynsym they refer to.
 663          */
 664         reldata = elf_getdata(scn_plt_rel, NULL);
 665         if (reldata == NULL)
 666                 goto out_elf_end;
 667
 668         syms = elf_getdata(scn_dynsym, NULL);
 669         if (syms == NULL)
 670                 goto out_elf_end;
 671
 672         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 673         if (scn_symstrs == NULL)
 674                 goto out_elf_end;
 675
 676         symstrs = elf_getdata(scn_symstrs, NULL);
 677         if (symstrs == NULL)
 678                 goto out_elf_end;
 679
 680         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 681         plt_offset = shdr_plt.sh_offset;
 682
 683         if (shdr_rel_plt.sh_type == SHT_RELA) {
 684                 GElf_Rela pos_mem, *pos;
 685
 686                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 687                                            nr_rel_entries) {
 688                         symidx = GELF_R_SYM(pos->r_info);
 689                         plt_offset += shdr_plt.sh_entsize;
 690                         gelf_getsym(syms, symidx, &sym);
 691                         snprintf(sympltname, sizeof(sympltname),
 692                                  "%s@plt", elf_sym__name(&sym, symstrs));
 693
 694                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 695                                         sympltname);
 696                         if (!f)
 697                                 goto out_elf_end;
 698
 699                         if (filter && filter(map, f))
 700                                 symbol__delete(f);
 701                         else {
 702                                 symbols__insert(&self->functions, f);
 703                                 ++nr;
 704                         }
 705                 }
 706         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 707                 GElf_Rel pos_mem, *pos;
 708                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 709                                           nr_rel_entries) {
 710                         symidx = GELF_R_SYM(pos->r_info);
 711                         plt_offset += shdr_plt.sh_entsize;
 712                         gelf_getsym(syms, symidx, &sym);
 713                         snprintf(sympltname, sizeof(sympltname),
 714                                  "%s@plt", elf_sym__name(&sym, symstrs));
 715
 716                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 717                                         sympltname);
 718                         if (!f)
 719                                 goto out_elf_end;
 720
 721                         if (filter && filter(map, f))
 722                                 symbol__delete(f);
 723                         else {
 724                                 symbols__insert(&self->functions, f);
 725                                 ++nr;
 726                         }
 727                 }
 728         }
 729
 730         err = 0;
 731 out_elf_end:
 732         elf_end(elf);
 733 out_close:
 734         close(fd);
 735
 736         if (err == 0)
 737                 return nr;
 738 out:
 739         pr_warning("%s: problems reading %s PLT info.\n",
 740                    __func__, self->long_name);
 741         return 0;
 742 }
 743
 744 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
 745                          int fd, symbol_filter_t filter, int kernel,
 746                          int kmodule)
 747 {
 748         struct map *curr_map = map;
 749         struct dso *curr_dso = self;
 750         size_t dso_name_len = strlen(self->short_name);
 751         Elf_Data *symstrs, *secstrs;
 752         uint32_t nr_syms;
 753         int err = -1;
 754         uint32_t idx;
 755         GElf_Ehdr ehdr;
 756         GElf_Shdr shdr;
 757         Elf_Data *syms;
 758         GElf_Sym sym;
 759         Elf_Scn *sec, *sec_strndx;
 760         Elf *elf;
 761         int nr = 0;
 762
 763         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 764         if (elf == NULL) {
 765                 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
 766                 goto out_close;
 767         }
 768
 769         if (gelf_getehdr(elf, &ehdr) == NULL) {
 770                 pr_err("%s: cannot get elf header.\n", __func__);
 771                 goto out_elf_end;
 772         }
 773
 774         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 775         if (sec == NULL) {
 776                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 777                 if (sec == NULL)
 778                         goto out_elf_end;
 779         }
 780
 781         syms = elf_getdata(sec, NULL);
 782         if (syms == NULL)
 783                 goto out_elf_end;
 784
 785         sec = elf_getscn(elf, shdr.sh_link);
 786         if (sec == NULL)
 787                 goto out_elf_end;
 788
 789         symstrs = elf_getdata(sec, NULL);
 790         if (symstrs == NULL)
 791                 goto out_elf_end;
 792
 793         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 794         if (sec_strndx == NULL)
 795                 goto out_elf_end;
 796
 797         secstrs = elf_getdata(sec_strndx, NULL);
 798         if (secstrs == NULL)
 799                 goto out_elf_end;
 800
 801         nr_syms = shdr.sh_size / shdr.sh_entsize;
 802
 803         memset(&sym, 0, sizeof(sym));
 804         if (!kernel) {
 805                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 806                                 elf_section_by_name(elf, &ehdr, &shdr,
 807                                                      ".gnu.prelink_undo",
 808                                                      NULL) != NULL);
 809         } else self->adjust_symbols = 0;
 810
 811         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 812                 struct symbol *f;
 813                 const char *elf_name;
 814                 char *demangled = NULL;
 815                 int is_label = elf_sym__is_label(&sym);
 816                 const char *section_name;
 817
 818                 if (!is_label && !elf_sym__is_function(&sym))
 819                         continue;
 820
 821                 sec = elf_getscn(elf, sym.st_shndx);
 822                 if (!sec)
 823                         goto out_elf_end;
 824
 825                 gelf_getshdr(sec, &shdr);
 826
 827                 if (is_label && !elf_sec__is_text(&shdr, secstrs))
 828                         continue;
 829
 830                 elf_name = elf_sym__name(&sym, symstrs);
 831                 section_name = elf_sec__name(&shdr, secstrs);
 832
 833                 if (kernel || kmodule) {
 834                         char dso_name[PATH_MAX];
 835
 836                         if (strcmp(section_name,
 837                                    curr_dso->short_name + dso_name_len) == 0)
 838                                 goto new_symbol;
 839
 840                         if (strcmp(section_name, ".text") == 0) {
 841                                 curr_map = map;
 842                                 curr_dso = self;
 843                                 goto new_symbol;
 844                         }
 845
 846                         snprintf(dso_name, sizeof(dso_name),
 847                                  "%s%s", self->short_name, section_name);
 848
 849                         curr_map = kernel_maps__find_by_dso_name(dso_name);
 850                         if (curr_map == NULL) {
 851                                 u64 start = sym.st_value;
 852
 853                                 if (kmodule)
 854                                         start += map->start + shdr.sh_offset;
 855
 856                                 curr_dso = dso__new(dso_name);
 857                                 if (curr_dso == NULL)
 858                                         goto out_elf_end;
 859                                 curr_map = map__new2(start, curr_dso,
 860                                                      MAP__FUNCTION);
 861                                 if (curr_map == NULL) {
 862                                         dso__delete(curr_dso);
 863                                         goto out_elf_end;
 864                                 }
 865                                 curr_map->map_ip = identity__map_ip;
 866                                 curr_map->unmap_ip = identity__map_ip;
 867                                 curr_dso->origin = DSO__ORIG_KERNEL;
 868                                 kernel_maps__insert(curr_map);
 869                                 dsos__add(&dsos__kernel, curr_dso);
 870                         } else
 871                                 curr_dso = curr_map->dso;
 872
 873                         goto new_symbol;
 874                 }
 875
 876                 if (curr_dso->adjust_symbols) {
 877                         pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
 878                                   "%Lx sh_offset: %Lx\n", (u64)sym.st_value,
 879                                   (u64)shdr.sh_addr, (u64)shdr.sh_offset);
 880                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 881                 }
 882                 /*
 883                  * We need to figure out if the object was created from C++ sources
 884                  * DWARF DW_compile_unit has this, but we don't always have access
 885                  * to it...
 886                  */
 887                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
 888                 if (demangled != NULL)
 889                         elf_name = demangled;
 890 new_symbol:
 891                 f = symbol__new(sym.st_value, sym.st_size, elf_name);
 892                 free(demangled);
 893                 if (!f)
 894                         goto out_elf_end;
 895
 896                 if (filter && filter(curr_map, f))
 897                         symbol__delete(f);
 898                 else {
 899                         symbols__insert(&curr_dso->functions, f);
 900                         nr++;
 901                 }
 902         }
 903
 904         /*
 905          * For misannotated, zeroed, ASM function sizes.
 906          */
 907         if (nr > 0)
 908                 symbols__fixup_end(&self->functions);
 909         err = nr;
 910 out_elf_end:
 911         elf_end(elf);
 912 out_close:
 913         return err;
 914 }
 915
 916 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
 917 {
 918         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
 919 }
 920
 921 static bool __dsos__read_build_ids(struct list_head *head)
 922 {
 923         bool have_build_id = false;
 924         struct dso *pos;
 925
 926         list_for_each_entry(pos, head, node)
 927                 if (filename__read_build_id(pos->long_name, pos->build_id,
 928                                             sizeof(pos->build_id)) > 0) {
 929                         have_build_id     = true;
 930                         pos->has_build_id = true;
 931                 }
 932
 933         return have_build_id;
 934 }
 935
 936 bool dsos__read_build_ids(void)
 937 {
 938         return __dsos__read_build_ids(&dsos__kernel) ||
 939                __dsos__read_build_ids(&dsos__user);
 940 }
 941
 942 /*
 943  * Align offset to 4 bytes as needed for note name and descriptor data.
 944  */
 945 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
 946
 947 int filename__read_build_id(const char *filename, void *bf, size_t size)
 948 {
 949         int fd, err = -1;
 950         GElf_Ehdr ehdr;
 951         GElf_Shdr shdr;
 952         Elf_Data *data;
 953         Elf_Scn *sec;
 954         Elf_Kind ek;
 955         void *ptr;
 956         Elf *elf;
 957
 958         if (size < BUILD_ID_SIZE)
 959                 goto out;
 960
 961         fd = open(filename, O_RDONLY);
 962         if (fd < 0)
 963                 goto out;
 964
 965         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 966         if (elf == NULL) {
 967                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
 968                 goto out_close;
 969         }
 970
 971         ek = elf_kind(elf);
 972         if (ek != ELF_K_ELF)
 973                 goto out_elf_end;
 974
 975         if (gelf_getehdr(elf, &ehdr) == NULL) {
 976                 pr_err("%s: cannot get elf header.\n", __func__);
 977                 goto out_elf_end;
 978         }
 979
 980         sec = elf_section_by_name(elf, &ehdr, &shdr,
 981                                   ".note.gnu.build-id", NULL);
 982         if (sec == NULL) {
 983                 sec = elf_section_by_name(elf, &ehdr, &shdr,
 984                                           ".notes", NULL);
 985                 if (sec == NULL)
 986                         goto out_elf_end;
 987         }
 988
 989         data = elf_getdata(sec, NULL);
 990         if (data == NULL)
 991                 goto out_elf_end;
 992
 993         ptr = data->d_buf;
 994         while (ptr < (data->d_buf + data->d_size)) {
 995                 GElf_Nhdr *nhdr = ptr;
 996                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
 997                     descsz = NOTE_ALIGN(nhdr->n_descsz);
 998                 const char *name;
 999
1000                 ptr += sizeof(*nhdr);
1001                 name = ptr;
1002                 ptr += namesz;
1003                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1004                     nhdr->n_namesz == sizeof("GNU")) {
1005                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1006                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1007                                 err = BUILD_ID_SIZE;
1008                                 break;
1009                         }
1010                 }
1011                 ptr += descsz;
1012         }
1013 out_elf_end:
1014         elf_end(elf);
1015 out_close:
1016         close(fd);
1017 out:
1018         return err;
1019 }
1020
1021 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1022 {
1023         int fd, err = -1;
1024
1025         if (size < BUILD_ID_SIZE)
1026                 goto out;
1027
1028         fd = open(filename, O_RDONLY);
1029         if (fd < 0)
1030                 goto out;
1031
1032         while (1) {
1033                 char bf[BUFSIZ];
1034                 GElf_Nhdr nhdr;
1035                 int namesz, descsz;
1036
1037                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1038                         break;
1039
1040                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1041                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1042                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1043                     nhdr.n_namesz == sizeof("GNU")) {
1044                         if (read(fd, bf, namesz) != namesz)
1045                                 break;
1046                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1047                                 if (read(fd, build_id,
1048                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1049                                         err = 0;
1050                                         break;
1051                                 }
1052                         } else if (read(fd, bf, descsz) != descsz)
1053                                 break;
1054                 } else {
1055                         int n = namesz + descsz;
1056                         if (read(fd, bf, n) != n)
1057                                 break;
1058                 }
1059         }
1060         close(fd);
1061 out:
1062         return err;
1063 }
1064
1065 char dso__symtab_origin(const struct dso *self)
1066 {
1067         static const char origin[] = {
1068                 [DSO__ORIG_KERNEL] =   'k',
1069                 [DSO__ORIG_JAVA_JIT] = 'j',
1070                 [DSO__ORIG_FEDORA] =   'f',
1071                 [DSO__ORIG_UBUNTU] =   'u',
1072                 [DSO__ORIG_BUILDID] =  'b',
1073                 [DSO__ORIG_DSO] =      'd',
1074                 [DSO__ORIG_KMODULE] =  'K',
1075         };
1076
1077         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1078                 return '!';
1079         return origin[self->origin];
1080 }
1081
1082 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1083 {
1084         int size = PATH_MAX;
1085         char *name;
1086         u8 build_id[BUILD_ID_SIZE];
1087         int ret = -1;
1088         int fd;
1089
1090         dso__set_loaded(self, map->type);
1091
1092         if (self->kernel)
1093                 return dso__load_kernel_sym(self, map, filter);
1094
1095         name = malloc(size);
1096         if (!name)
1097                 return -1;
1098
1099         self->adjust_symbols = 0;
1100
1101         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1102                 ret = dso__load_perf_map(self, map, filter);
1103                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1104                                          DSO__ORIG_NOT_FOUND;
1105                 return ret;
1106         }
1107
1108         self->origin = DSO__ORIG_FEDORA - 1;
1109
1110 more:
1111         do {
1112                 self->origin++;
1113                 switch (self->origin) {
1114                 case DSO__ORIG_FEDORA:
1115                         snprintf(name, size, "/usr/lib/debug%s.debug",
1116                                  self->long_name);
1117                         break;
1118                 case DSO__ORIG_UBUNTU:
1119                         snprintf(name, size, "/usr/lib/debug%s",
1120                                  self->long_name);
1121                         break;
1122                 case DSO__ORIG_BUILDID:
1123                         if (filename__read_build_id(self->long_name, build_id,
1124                                                     sizeof(build_id))) {
1125                                 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1126
1127                                 build_id__sprintf(build_id, sizeof(build_id),
1128                                                   build_id_hex);
1129                                 snprintf(name, size,
1130                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
1131                                         build_id_hex, build_id_hex + 2);
1132                                 if (self->has_build_id)
1133                                         goto compare_build_id;
1134                                 break;
1135                         }
1136                         self->origin++;
1137                         /* Fall thru */
1138                 case DSO__ORIG_DSO:
1139                         snprintf(name, size, "%s", self->long_name);
1140                         break;
1141
1142                 default:
1143                         goto out;
1144                 }
1145
1146                 if (self->has_build_id) {
1147                         if (filename__read_build_id(name, build_id,
1148                                                     sizeof(build_id)) < 0)
1149                                 goto more;
1150 compare_build_id:
1151                         if (!dso__build_id_equal(self, build_id))
1152                                 goto more;
1153                 }
1154
1155                 fd = open(name, O_RDONLY);
1156         } while (fd < 0);
1157
1158         ret = dso__load_sym(self, map, name, fd, filter, 0, 0);
1159         close(fd);
1160
1161         /*
1162          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1163          */
1164         if (!ret)
1165                 goto more;
1166
1167         if (ret > 0) {
1168                 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1169                 if (nr_plt > 0)
1170                         ret += nr_plt;
1171         }
1172 out:
1173         free(name);
1174         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1175                 return 0;
1176         return ret;
1177 }
1178
1179 static void kernel_maps__insert(struct map *map)
1180 {
1181         maps__insert(&kernel_maps__functions, map);
1182 }
1183
1184 struct symbol *kernel_maps__find_function(u64 ip, struct map **mapp,
1185                                           symbol_filter_t filter)
1186 {
1187         struct map *map = maps__find(&kernel_maps__functions, ip);
1188
1189         if (mapp)
1190                 *mapp = map;
1191
1192         if (map) {
1193                 ip = map->map_ip(map, ip);
1194                 return map__find_function(map, ip, filter);
1195         } else
1196                 WARN_ONCE(RB_EMPTY_ROOT(&kernel_maps__functions),
1197                           "Empty kernel_maps, was symbol__init() called?\n");
1198
1199         return NULL;
1200 }
1201
1202 struct map *kernel_maps__find_by_dso_name(const char *name)
1203 {
1204         struct rb_node *nd;
1205
1206         for (nd = rb_first(&kernel_maps__functions); nd; nd = rb_next(nd)) {
1207                 struct map *map = rb_entry(nd, struct map, rb_node);
1208
1209                 if (map->dso && strcmp(map->dso->name, name) == 0)
1210                         return map;
1211         }
1212
1213         return NULL;
1214 }
1215
1216 static int dsos__set_modules_path_dir(char *dirname)
1217 {
1218         struct dirent *dent;
1219         DIR *dir = opendir(dirname);
1220
1221         if (!dir) {
1222                 pr_debug("%s: cannot open %s dir\n", __func__, dirname);
1223                 return -1;
1224         }
1225
1226         while ((dent = readdir(dir)) != NULL) {
1227                 char path[PATH_MAX];
1228
1229                 if (dent->d_type == DT_DIR) {
1230                         if (!strcmp(dent->d_name, ".") ||
1231                             !strcmp(dent->d_name, ".."))
1232                                 continue;
1233
1234                         snprintf(path, sizeof(path), "%s/%s",
1235                                  dirname, dent->d_name);
1236                         if (dsos__set_modules_path_dir(path) < 0)
1237                                 goto failure;
1238                 } else {
1239                         char *dot = strrchr(dent->d_name, '.'),
1240                              dso_name[PATH_MAX];
1241                         struct map *map;
1242                         char *long_name;
1243
1244                         if (dot == NULL || strcmp(dot, ".ko"))
1245                                 continue;
1246                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1247                                  (int)(dot - dent->d_name), dent->d_name);
1248
1249                         strxfrchar(dso_name, '-', '_');
1250                         map = kernel_maps__find_by_dso_name(dso_name);
1251                         if (map == NULL)
1252                                 continue;
1253
1254                         snprintf(path, sizeof(path), "%s/%s",
1255                                  dirname, dent->d_name);
1256
1257                         long_name = strdup(path);
1258                         if (long_name == NULL)
1259                                 goto failure;
1260                         dso__set_long_name(map->dso, long_name);
1261                 }
1262         }
1263
1264         return 0;
1265 failure:
1266         closedir(dir);
1267         return -1;
1268 }
1269
1270 static int dsos__set_modules_path(void)
1271 {
1272         struct utsname uts;
1273         char modules_path[PATH_MAX];
1274
1275         if (uname(&uts) < 0)
1276                 return -1;
1277
1278         snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1279                  uts.release);
1280
1281         return dsos__set_modules_path_dir(modules_path);
1282 }
1283
1284 /*
1285  * Constructor variant for modules (where we know from /proc/modules where
1286  * they are loaded) and for vmlinux, where only after we load all the
1287  * symbols we'll know where it starts and ends.
1288  */
1289 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1290 {
1291         struct map *self = malloc(sizeof(*self));
1292
1293         if (self != NULL) {
1294                 /*
1295                  * ->end will be filled after we load all the symbols
1296                  */
1297                 map__init(self, type, start, 0, 0, dso);
1298         }
1299
1300         return self;
1301 }
1302
1303 static int kernel_maps__create_module_maps(void)
1304 {
1305         char *line = NULL;
1306         size_t n;
1307         FILE *file = fopen("/proc/modules", "r");
1308         struct map *map;
1309
1310         if (file == NULL)
1311                 return -1;
1312
1313         while (!feof(file)) {
1314                 char name[PATH_MAX];
1315                 u64 start;
1316                 struct dso *dso;
1317                 char *sep;
1318                 int line_len;
1319
1320                 line_len = getline(&line, &n, file);
1321                 if (line_len < 0)
1322                         break;
1323
1324                 if (!line)
1325                         goto out_failure;
1326
1327                 line[--line_len] = '\0'; /* \n */
1328
1329                 sep = strrchr(line, 'x');
1330                 if (sep == NULL)
1331                         continue;
1332
1333                 hex2u64(sep + 1, &start);
1334
1335                 sep = strchr(line, ' ');
1336                 if (sep == NULL)
1337                         continue;
1338
1339                 *sep = '\0';
1340
1341                 snprintf(name, sizeof(name), "[%s]", line);
1342                 dso = dso__new(name);
1343
1344                 if (dso == NULL)
1345                         goto out_delete_line;
1346
1347                 map = map__new2(start, dso, MAP__FUNCTION);
1348                 if (map == NULL) {
1349                         dso__delete(dso);
1350                         goto out_delete_line;
1351                 }
1352
1353                 snprintf(name, sizeof(name),
1354                          "/sys/module/%s/notes/.note.gnu.build-id", line);
1355                 if (sysfs__read_build_id(name, dso->build_id,
1356                                          sizeof(dso->build_id)) == 0)
1357                         dso->has_build_id = true;
1358
1359                 dso->origin = DSO__ORIG_KMODULE;
1360                 kernel_maps__insert(map);
1361                 dsos__add(&dsos__kernel, dso);
1362         }
1363
1364         free(line);
1365         fclose(file);
1366
1367         return dsos__set_modules_path();
1368
1369 out_delete_line:
1370         free(line);
1371 out_failure:
1372         return -1;
1373 }
1374
1375 static int dso__load_vmlinux(struct dso *self, struct map *map,
1376                              const char *vmlinux, symbol_filter_t filter)
1377 {
1378         int err = -1, fd;
1379
1380         if (self->has_build_id) {
1381                 u8 build_id[BUILD_ID_SIZE];
1382
1383                 if (filename__read_build_id(vmlinux, build_id,
1384                                             sizeof(build_id)) < 0) {
1385                         pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1386                         return -1;
1387                 }
1388                 if (!dso__build_id_equal(self, build_id)) {
1389                         char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1390                              vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1391
1392                         build_id__sprintf(self->build_id,
1393                                           sizeof(self->build_id),
1394                                           expected_build_id);
1395                         build_id__sprintf(build_id, sizeof(build_id),
1396                                           vmlinux_build_id);
1397                         pr_debug("build_id in %s is %s while expected is %s, "
1398                                  "ignoring it\n", vmlinux, vmlinux_build_id,
1399                                  expected_build_id);
1400                         return -1;
1401                 }
1402         }
1403
1404         fd = open(vmlinux, O_RDONLY);
1405         if (fd < 0)
1406                 return -1;
1407
1408         dso__set_loaded(self, map->type);
1409         err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0);
1410
1411         close(fd);
1412
1413         return err;
1414 }
1415
1416 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1417                                 symbol_filter_t filter)
1418 {
1419         int err;
1420         bool is_kallsyms;
1421
1422         if (vmlinux_path != NULL) {
1423                 int i;
1424                 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1425                          vmlinux_path__nr_entries);
1426                 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1427                         err = dso__load_vmlinux(self, map, vmlinux_path[i],
1428                                                 filter);
1429                         if (err > 0) {
1430                                 pr_debug("Using %s for symbols\n",
1431                                          vmlinux_path[i]);
1432                                 dso__set_long_name(self,
1433                                                    strdup(vmlinux_path[i]));
1434                                 goto out_fixup;
1435                         }
1436                 }
1437         }
1438
1439         is_kallsyms = self->long_name[0] == '[';
1440         if (is_kallsyms)
1441                 goto do_kallsyms;
1442
1443         err = dso__load_vmlinux(self, map, self->long_name, filter);
1444         if (err <= 0) {
1445                 pr_info("The file %s cannot be used, "
1446                         "trying to use /proc/kallsyms...", self->long_name);
1447                 sleep(2);
1448 do_kallsyms:
1449                 err = kernel_maps__load_kallsyms(filter);
1450                 if (err > 0 && !is_kallsyms)
1451                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1452         }
1453
1454         if (err > 0) {
1455 out_fixup:
1456                 map__fixup_start(map, &map->dso->functions);
1457                 map__fixup_end(map, &map->dso->functions);
1458         }
1459
1460         return err;
1461 }
1462
1463 LIST_HEAD(dsos__user);
1464 LIST_HEAD(dsos__kernel);
1465 struct dso *vdso;
1466
1467 static void dsos__add(struct list_head *head, struct dso *dso)
1468 {
1469         list_add_tail(&dso->node, head);
1470 }
1471
1472 static struct dso *dsos__find(struct list_head *head, const char *name)
1473 {
1474         struct dso *pos;
1475
1476         list_for_each_entry(pos, head, node)
1477                 if (strcmp(pos->name, name) == 0)
1478                         return pos;
1479         return NULL;
1480 }
1481
1482 struct dso *dsos__findnew(const char *name)
1483 {
1484         struct dso *dso = dsos__find(&dsos__user, name);
1485
1486         if (!dso) {
1487                 dso = dso__new(name);
1488                 if (dso != NULL) {
1489                         dsos__add(&dsos__user, dso);
1490                         dso__set_basename(dso);
1491                 }
1492         }
1493
1494         return dso;
1495 }
1496
1497 static void __dsos__fprintf(struct list_head *head, FILE *fp)
1498 {
1499         struct dso *pos;
1500
1501         list_for_each_entry(pos, head, node)
1502                 dso__fprintf(pos, fp);
1503 }
1504
1505 void dsos__fprintf(FILE *fp)
1506 {
1507         __dsos__fprintf(&dsos__kernel, fp);
1508         __dsos__fprintf(&dsos__user, fp);
1509 }
1510
1511 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp)
1512 {
1513         struct dso *pos;
1514         size_t ret = 0;
1515
1516         list_for_each_entry(pos, head, node) {
1517                 ret += dso__fprintf_buildid(pos, fp);
1518                 ret += fprintf(fp, " %s\n", pos->long_name);
1519         }
1520         return ret;
1521 }
1522
1523 size_t dsos__fprintf_buildid(FILE *fp)
1524 {
1525         return (__dsos__fprintf_buildid(&dsos__kernel, fp) +
1526                 __dsos__fprintf_buildid(&dsos__user, fp));
1527 }
1528
1529 static int kernel_maps__create_kernel_map(const struct symbol_conf *conf)
1530 {
1531         struct dso *kernel = dso__new(conf->vmlinux_name ?: "[kernel.kallsyms]");
1532
1533         if (kernel == NULL)
1534                 return -1;
1535
1536         kernel_map__functions = map__new2(0, kernel, MAP__FUNCTION);
1537         if (kernel_map__functions == NULL)
1538                 goto out_delete_kernel_dso;
1539
1540         kernel_map__functions->map_ip    = kernel_map__functions->unmap_ip = identity__map_ip;
1541         kernel->short_name       = "[kernel]";
1542         kernel->kernel           = 1;
1543
1544         vdso = dso__new("[vdso]");
1545         if (vdso == NULL)
1546                 goto out_delete_kernel_map;
1547         dso__set_loaded(vdso, MAP__FUNCTION);
1548
1549         if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
1550                                  sizeof(kernel->build_id)) == 0)
1551                 kernel->has_build_id = true;
1552
1553         kernel_maps__insert(kernel_map__functions);
1554         dsos__add(&dsos__kernel, kernel);
1555         dsos__add(&dsos__user, vdso);
1556
1557         return 0;
1558
1559 out_delete_kernel_map:
1560         map__delete(kernel_map__functions);
1561         kernel_map__functions = NULL;
1562 out_delete_kernel_dso:
1563         dso__delete(kernel);
1564         return -1;
1565 }
1566
1567 static void vmlinux_path__exit(void)
1568 {
1569         while (--vmlinux_path__nr_entries >= 0) {
1570                 free(vmlinux_path[vmlinux_path__nr_entries]);
1571                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1572         }
1573
1574         free(vmlinux_path);
1575         vmlinux_path = NULL;
1576 }
1577
1578 static int vmlinux_path__init(void)
1579 {
1580         struct utsname uts;
1581         char bf[PATH_MAX];
1582
1583         if (uname(&uts) < 0)
1584                 return -1;
1585
1586         vmlinux_path = malloc(sizeof(char *) * 5);
1587         if (vmlinux_path == NULL)
1588                 return -1;
1589
1590         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1591         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1592                 goto out_fail;
1593         ++vmlinux_path__nr_entries;
1594         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1595         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1596                 goto out_fail;
1597         ++vmlinux_path__nr_entries;
1598         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1599         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1600         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1601                 goto out_fail;
1602         ++vmlinux_path__nr_entries;
1603         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1604         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1605         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1606                 goto out_fail;
1607         ++vmlinux_path__nr_entries;
1608         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1609                  uts.release);
1610         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1611         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1612                 goto out_fail;
1613         ++vmlinux_path__nr_entries;
1614
1615         return 0;
1616
1617 out_fail:
1618         vmlinux_path__exit();
1619         return -1;
1620 }
1621
1622 static int kernel_maps__init(const struct symbol_conf *conf)
1623 {
1624         const struct symbol_conf *pconf = conf ?: &symbol_conf__defaults;
1625
1626         symbol__priv_size = pconf->priv_size;
1627
1628         if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
1629                 return -1;
1630
1631         if (kernel_maps__create_kernel_map(pconf) < 0) {
1632                 vmlinux_path__exit();
1633                 return -1;
1634         }
1635
1636         if (pconf->use_modules && kernel_maps__create_module_maps() < 0)
1637                 pr_debug("Failed to load list of modules in use, "
1638                          "continuing...\n");
1639         /*
1640          * Now that we have all the maps created, just set the ->end of them:
1641          */
1642         kernel_maps__fixup_end();
1643         return 0;
1644 }
1645
1646 int symbol__init(struct symbol_conf *conf)
1647 {
1648         elf_version(EV_CURRENT);
1649         return kernel_maps__init(conf);
1650 }