Pileus Git - ~andy/linux/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 struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr);
  34 static int dso__load_kernel_sym(struct dso *self, struct map *map,
  35                                 struct map_groups *mg, symbol_filter_t filter);
  36 unsigned int symbol__priv_size;
  37 static int vmlinux_path__nr_entries;
  38 static char **vmlinux_path;
  39
  40 static struct symbol_conf symbol_conf__defaults = {
  41         .use_modules      = true,
  42         .try_vmlinux_path = true,
  43 };
  44
  45 static struct map_groups kmaps_mem;
  46 struct map_groups *kmaps = &kmaps_mem;
  47
  48 bool dso__loaded(const struct dso *self, enum map_type type)
  49 {
  50         return self->loaded & (1 << type);
  51 }
  52
  53 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
  54 {
  55         return self->sorted_by_name & (1 << type);
  56 }
  57
  58 static void dso__set_loaded(struct dso *self, enum map_type type)
  59 {
  60         self->loaded |= (1 << type);
  61 }
  62
  63 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
  64 {
  65         self->sorted_by_name |= (1 << type);
  66 }
  67
  68 static bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  69 {
  70         switch (map_type) {
  71         case MAP__FUNCTION:
  72                 return symbol_type == 'T' || symbol_type == 'W';
  73         case MAP__VARIABLE:
  74                 return symbol_type == 'D' || symbol_type == 'd';
  75         default:
  76                 return false;
  77         }
  78 }
  79
  80 static void symbols__fixup_end(struct rb_root *self)
  81 {
  82         struct rb_node *nd, *prevnd = rb_first(self);
  83         struct symbol *curr, *prev;
  84
  85         if (prevnd == NULL)
  86                 return;
  87
  88         curr = rb_entry(prevnd, struct symbol, rb_node);
  89
  90         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  91                 prev = curr;
  92                 curr = rb_entry(nd, struct symbol, rb_node);
  93
  94                 if (prev->end == prev->start)
  95                         prev->end = curr->start - 1;
  96         }
  97
  98         /* Last entry */
  99         if (curr->end == curr->start)
 100                 curr->end = roundup(curr->start, 4096);
 101 }
 102
 103 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
 104 {
 105         struct map *prev, *curr;
 106         struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
 107
 108         if (prevnd == NULL)
 109                 return;
 110
 111         curr = rb_entry(prevnd, struct map, rb_node);
 112
 113         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 114                 prev = curr;
 115                 curr = rb_entry(nd, struct map, rb_node);
 116                 prev->end = curr->start - 1;
 117         }
 118
 119         /*
 120          * We still haven't the actual symbols, so guess the
 121          * last map final address.
 122          */
 123         curr->end = ~0UL;
 124 }
 125
 126 static void map_groups__fixup_end(struct map_groups *self)
 127 {
 128         int i;
 129         for (i = 0; i < MAP__NR_TYPES; ++i)
 130                 __map_groups__fixup_end(self, i);
 131 }
 132
 133 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
 134 {
 135         size_t namelen = strlen(name) + 1;
 136         struct symbol *self = zalloc(symbol__priv_size +
 137                                      sizeof(*self) + namelen);
 138         if (self == NULL)
 139                 return NULL;
 140
 141         if (symbol__priv_size)
 142                 self = ((void *)self) + symbol__priv_size;
 143
 144         self->start = start;
 145         self->end   = len ? start + len - 1 : start;
 146
 147         pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
 148
 149         memcpy(self->name, name, namelen);
 150
 151         return self;
 152 }
 153
 154 static void symbol__delete(struct symbol *self)
 155 {
 156         free(((void *)self) - symbol__priv_size);
 157 }
 158
 159 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 160 {
 161         return fprintf(fp, " %llx-%llx %s\n",
 162                        self->start, self->end, self->name);
 163 }
 164
 165 static void dso__set_long_name(struct dso *self, char *name)
 166 {
 167         if (name == NULL)
 168                 return;
 169         self->long_name = name;
 170         self->long_name_len = strlen(name);
 171 }
 172
 173 static void dso__set_basename(struct dso *self)
 174 {
 175         self->short_name = basename(self->long_name);
 176 }
 177
 178 struct dso *dso__new(const char *name)
 179 {
 180         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 181
 182         if (self != NULL) {
 183                 int i;
 184                 strcpy(self->name, name);
 185                 dso__set_long_name(self, self->name);
 186                 self->short_name = self->name;
 187                 for (i = 0; i < MAP__NR_TYPES; ++i)
 188                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
 189                 self->find_symbol = dso__find_symbol;
 190                 self->slen_calculated = 0;
 191                 self->origin = DSO__ORIG_NOT_FOUND;
 192                 self->loaded = 0;
 193                 self->sorted_by_name = 0;
 194                 self->has_build_id = 0;
 195         }
 196
 197         return self;
 198 }
 199
 200 static void symbols__delete(struct rb_root *self)
 201 {
 202         struct symbol *pos;
 203         struct rb_node *next = rb_first(self);
 204
 205         while (next) {
 206                 pos = rb_entry(next, struct symbol, rb_node);
 207                 next = rb_next(&pos->rb_node);
 208                 rb_erase(&pos->rb_node, self);
 209                 symbol__delete(pos);
 210         }
 211 }
 212
 213 void dso__delete(struct dso *self)
 214 {
 215         int i;
 216         for (i = 0; i < MAP__NR_TYPES; ++i)
 217                 symbols__delete(&self->symbols[i]);
 218         if (self->long_name != self->name)
 219                 free(self->long_name);
 220         free(self);
 221 }
 222
 223 void dso__set_build_id(struct dso *self, void *build_id)
 224 {
 225         memcpy(self->build_id, build_id, sizeof(self->build_id));
 226         self->has_build_id = 1;
 227 }
 228
 229 static void symbols__insert(struct rb_root *self, struct symbol *sym)
 230 {
 231         struct rb_node **p = &self->rb_node;
 232         struct rb_node *parent = NULL;
 233         const u64 ip = sym->start;
 234         struct symbol *s;
 235
 236         while (*p != NULL) {
 237                 parent = *p;
 238                 s = rb_entry(parent, struct symbol, rb_node);
 239                 if (ip < s->start)
 240                         p = &(*p)->rb_left;
 241                 else
 242                         p = &(*p)->rb_right;
 243         }
 244         rb_link_node(&sym->rb_node, parent, p);
 245         rb_insert_color(&sym->rb_node, self);
 246 }
 247
 248 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
 249 {
 250         struct rb_node *n;
 251
 252         if (self == NULL)
 253                 return NULL;
 254
 255         n = self->rb_node;
 256
 257         while (n) {
 258                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 259
 260                 if (ip < s->start)
 261                         n = n->rb_left;
 262                 else if (ip > s->end)
 263                         n = n->rb_right;
 264                 else
 265                         return s;
 266         }
 267
 268         return NULL;
 269 }
 270
 271 struct symbol_name_rb_node {
 272         struct rb_node  rb_node;
 273         struct symbol   sym;
 274 };
 275
 276 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
 277 {
 278         struct rb_node **p = &self->rb_node;
 279         struct rb_node *parent = NULL;
 280         struct symbol_name_rb_node *symn = ((void *)sym) - sizeof(*parent), *s;
 281
 282         while (*p != NULL) {
 283                 parent = *p;
 284                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 285                 if (strcmp(sym->name, s->sym.name) < 0)
 286                         p = &(*p)->rb_left;
 287                 else
 288                         p = &(*p)->rb_right;
 289         }
 290         rb_link_node(&symn->rb_node, parent, p);
 291         rb_insert_color(&symn->rb_node, self);
 292 }
 293
 294 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
 295 {
 296         struct rb_node *nd;
 297
 298         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 299                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 300                 symbols__insert_by_name(self, pos);
 301         }
 302 }
 303
 304 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
 305 {
 306         struct rb_node *n;
 307
 308         if (self == NULL)
 309                 return NULL;
 310
 311         n = self->rb_node;
 312
 313         while (n) {
 314                 struct symbol_name_rb_node *s;
 315                 int cmp;
 316
 317                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 318                 cmp = strcmp(name, s->sym.name);
 319
 320                 if (cmp < 0)
 321                         n = n->rb_left;
 322                 else if (cmp > 0)
 323                         n = n->rb_right;
 324                 else
 325                         return &s->sym;
 326         }
 327
 328         return NULL;
 329 }
 330
 331 struct symbol *dso__find_symbol(struct dso *self,
 332                                 enum map_type type, u64 addr)
 333 {
 334         return symbols__find(&self->symbols[type], addr);
 335 }
 336
 337 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 338                                         const char *name)
 339 {
 340         return symbols__find_by_name(&self->symbol_names[type], name);
 341 }
 342
 343 void dso__sort_by_name(struct dso *self, enum map_type type)
 344 {
 345         dso__set_sorted_by_name(self, type);
 346         return symbols__sort_by_name(&self->symbol_names[type],
 347                                      &self->symbols[type]);
 348 }
 349
 350 int build_id__sprintf(u8 *self, int len, char *bf)
 351 {
 352         char *bid = bf;
 353         u8 *raw = self;
 354         int i;
 355
 356         for (i = 0; i < len; ++i) {
 357                 sprintf(bid, "%02x", *raw);
 358                 ++raw;
 359                 bid += 2;
 360         }
 361
 362         return raw - self;
 363 }
 364
 365 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 366 {
 367         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 368
 369         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 370         return fprintf(fp, "%s", sbuild_id);
 371 }
 372
 373 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
 374 {
 375         struct rb_node *nd;
 376         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 377
 378         ret += dso__fprintf_buildid(self, fp);
 379         ret += fprintf(fp, ")\n");
 380         for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
 381                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 382                 ret += symbol__fprintf(pos, fp);
 383         }
 384
 385         return ret;
 386 }
 387
 388 /*
 389  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 390  * so that we can in the next step set the symbol ->end address and then
 391  * call kernel_maps__split_kallsyms.
 392  */
 393 static int dso__load_all_kallsyms(struct dso *self, struct map *map)
 394 {
 395         char *line = NULL;
 396         size_t n;
 397         struct rb_root *root = &self->symbols[map->type];
 398         FILE *file = fopen("/proc/kallsyms", "r");
 399
 400         if (file == NULL)
 401                 goto out_failure;
 402
 403         while (!feof(file)) {
 404                 u64 start;
 405                 struct symbol *sym;
 406                 int line_len, len;
 407                 char symbol_type;
 408                 char *symbol_name;
 409
 410                 line_len = getline(&line, &n, file);
 411                 if (line_len < 0)
 412                         break;
 413
 414                 if (!line)
 415                         goto out_failure;
 416
 417                 line[--line_len] = '\0'; /* \n */
 418
 419                 len = hex2u64(line, &start);
 420
 421                 len++;
 422                 if (len + 2 >= line_len)
 423                         continue;
 424
 425                 symbol_type = toupper(line[len]);
 426                 if (!symbol_type__is_a(symbol_type, map->type))
 427                         continue;
 428
 429                 symbol_name = line + len + 2;
 430                 /*
 431                  * Will fix up the end later, when we have all symbols sorted.
 432                  */
 433                 sym = symbol__new(start, 0, symbol_name);
 434
 435                 if (sym == NULL)
 436                         goto out_delete_line;
 437                 /*
 438                  * We will pass the symbols to the filter later, in
 439                  * map__split_kallsyms, when we have split the maps per module
 440                  */
 441                 symbols__insert(root, sym);
 442         }
 443
 444         free(line);
 445         fclose(file);
 446
 447         return 0;
 448
 449 out_delete_line:
 450         free(line);
 451 out_failure:
 452         return -1;
 453 }
 454
 455 /*
 456  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 457  * kernel range is broken in several maps, named [kernel].N, as we don't have
 458  * the original ELF section names vmlinux have.
 459  */
 460 static int dso__split_kallsyms(struct dso *self, struct map *map,
 461                                struct map_groups *mg, symbol_filter_t filter)
 462 {
 463         struct map *curr_map = map;
 464         struct symbol *pos;
 465         int count = 0;
 466         struct rb_root *root = &self->symbols[map->type];
 467         struct rb_node *next = rb_first(root);
 468         int kernel_range = 0;
 469
 470         while (next) {
 471                 char *module;
 472
 473                 pos = rb_entry(next, struct symbol, rb_node);
 474                 next = rb_next(&pos->rb_node);
 475
 476                 module = strchr(pos->name, '\t');
 477                 if (module) {
 478                         if (!mg->use_modules)
 479                                 goto discard_symbol;
 480
 481                         *module++ = '\0';
 482
 483                         if (strcmp(self->name, module)) {
 484                                 curr_map = map_groups__find_by_name(mg, map->type, module);
 485                                 if (curr_map == NULL) {
 486                                         pr_debug("/proc/{kallsyms,modules} "
 487                                                  "inconsistency!\n");
 488                                         return -1;
 489                                 }
 490                         }
 491                         /*
 492                          * So that we look just like we get from .ko files,
 493                          * i.e. not prelinked, relative to map->start.
 494                          */
 495                         pos->start = curr_map->map_ip(curr_map, pos->start);
 496                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 497                 } else if (curr_map != map) {
 498                         char dso_name[PATH_MAX];
 499                         struct dso *dso;
 500
 501                         snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
 502                                  kernel_range++);
 503
 504                         dso = dso__new(dso_name);
 505                         if (dso == NULL)
 506                                 return -1;
 507
 508                         curr_map = map__new2(pos->start, dso, map->type);
 509                         if (map == NULL) {
 510                                 dso__delete(dso);
 511                                 return -1;
 512                         }
 513
 514                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 515                         map_groups__insert(mg, curr_map);
 516                         ++kernel_range;
 517                 }
 518
 519                 if (filter && filter(curr_map, pos)) {
 520 discard_symbol:         rb_erase(&pos->rb_node, root);
 521                         symbol__delete(pos);
 522                 } else {
 523                         if (curr_map != map) {
 524                                 rb_erase(&pos->rb_node, root);
 525                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 526                         }
 527                         count++;
 528                 }
 529         }
 530
 531         return count;
 532 }
 533
 534
 535 static int dso__load_kallsyms(struct dso *self, struct map *map,
 536                               struct map_groups *mg, symbol_filter_t filter)
 537 {
 538         if (dso__load_all_kallsyms(self, map) < 0)
 539                 return -1;
 540
 541         symbols__fixup_end(&self->symbols[map->type]);
 542         self->origin = DSO__ORIG_KERNEL;
 543
 544         return dso__split_kallsyms(self, map, mg, filter);
 545 }
 546
 547 size_t kernel_maps__fprintf(FILE *fp)
 548 {
 549         size_t printed = fprintf(fp, "Kernel maps:\n");
 550         printed += map_groups__fprintf_maps(kmaps, fp);
 551         return printed + fprintf(fp, "END kernel maps\n");
 552 }
 553
 554 static int dso__load_perf_map(struct dso *self, struct map *map,
 555                               symbol_filter_t filter)
 556 {
 557         char *line = NULL;
 558         size_t n;
 559         FILE *file;
 560         int nr_syms = 0;
 561
 562         file = fopen(self->long_name, "r");
 563         if (file == NULL)
 564                 goto out_failure;
 565
 566         while (!feof(file)) {
 567                 u64 start, size;
 568                 struct symbol *sym;
 569                 int line_len, len;
 570
 571                 line_len = getline(&line, &n, file);
 572                 if (line_len < 0)
 573                         break;
 574
 575                 if (!line)
 576                         goto out_failure;
 577
 578                 line[--line_len] = '\0'; /* \n */
 579
 580                 len = hex2u64(line, &start);
 581
 582                 len++;
 583                 if (len + 2 >= line_len)
 584                         continue;
 585
 586                 len += hex2u64(line + len, &size);
 587
 588                 len++;
 589                 if (len + 2 >= line_len)
 590                         continue;
 591
 592                 sym = symbol__new(start, size, line + len);
 593
 594                 if (sym == NULL)
 595                         goto out_delete_line;
 596
 597                 if (filter && filter(map, sym))
 598                         symbol__delete(sym);
 599                 else {
 600                         symbols__insert(&self->symbols[map->type], sym);
 601                         nr_syms++;
 602                 }
 603         }
 604
 605         free(line);
 606         fclose(file);
 607
 608         return nr_syms;
 609
 610 out_delete_line:
 611         free(line);
 612 out_failure:
 613         return -1;
 614 }
 615
 616 /**
 617  * elf_symtab__for_each_symbol - iterate thru all the symbols
 618  *
 619  * @self: struct elf_symtab instance to iterate
 620  * @idx: uint32_t idx
 621  * @sym: GElf_Sym iterator
 622  */
 623 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 624         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 625              idx < nr_syms; \
 626              idx++, gelf_getsym(syms, idx, &sym))
 627
 628 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 629 {
 630         return GELF_ST_TYPE(sym->st_info);
 631 }
 632
 633 static inline int elf_sym__is_function(const GElf_Sym *sym)
 634 {
 635         return elf_sym__type(sym) == STT_FUNC &&
 636                sym->st_name != 0 &&
 637                sym->st_shndx != SHN_UNDEF;
 638 }
 639
 640 static inline bool elf_sym__is_object(const GElf_Sym *sym)
 641 {
 642         return elf_sym__type(sym) == STT_OBJECT &&
 643                 sym->st_name != 0 &&
 644                 sym->st_shndx != SHN_UNDEF;
 645 }
 646
 647 static inline int elf_sym__is_label(const GElf_Sym *sym)
 648 {
 649         return elf_sym__type(sym) == STT_NOTYPE &&
 650                 sym->st_name != 0 &&
 651                 sym->st_shndx != SHN_UNDEF &&
 652                 sym->st_shndx != SHN_ABS;
 653 }
 654
 655 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 656                                         const Elf_Data *secstrs)
 657 {
 658         return secstrs->d_buf + shdr->sh_name;
 659 }
 660
 661 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 662                                         const Elf_Data *secstrs)
 663 {
 664         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 665 }
 666
 667 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
 668                                     const Elf_Data *secstrs)
 669 {
 670         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
 671 }
 672
 673 static inline const char *elf_sym__name(const GElf_Sym *sym,
 674                                         const Elf_Data *symstrs)
 675 {
 676         return symstrs->d_buf + sym->st_name;
 677 }
 678
 679 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 680                                     GElf_Shdr *shp, const char *name,
 681                                     size_t *idx)
 682 {
 683         Elf_Scn *sec = NULL;
 684         size_t cnt = 1;
 685
 686         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 687                 char *str;
 688
 689                 gelf_getshdr(sec, shp);
 690                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 691                 if (!strcmp(name, str)) {
 692                         if (idx)
 693                                 *idx = cnt;
 694                         break;
 695                 }
 696                 ++cnt;
 697         }
 698
 699         return sec;
 700 }
 701
 702 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 703         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 704              idx < nr_entries; \
 705              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 706
 707 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 708         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 709              idx < nr_entries; \
 710              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 711
 712 /*
 713  * We need to check if we have a .dynsym, so that we can handle the
 714  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 715  * .dynsym or .symtab).
 716  * And always look at the original dso, not at debuginfo packages, that
 717  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 718  */
 719 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 720                                        symbol_filter_t filter)
 721 {
 722         uint32_t nr_rel_entries, idx;
 723         GElf_Sym sym;
 724         u64 plt_offset;
 725         GElf_Shdr shdr_plt;
 726         struct symbol *f;
 727         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 728         Elf_Data *reldata, *syms, *symstrs;
 729         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 730         size_t dynsym_idx;
 731         GElf_Ehdr ehdr;
 732         char sympltname[1024];
 733         Elf *elf;
 734         int nr = 0, symidx, fd, err = 0;
 735
 736         fd = open(self->long_name, O_RDONLY);
 737         if (fd < 0)
 738                 goto out;
 739
 740         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 741         if (elf == NULL)
 742                 goto out_close;
 743
 744         if (gelf_getehdr(elf, &ehdr) == NULL)
 745                 goto out_elf_end;
 746
 747         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 748                                          ".dynsym", &dynsym_idx);
 749         if (scn_dynsym == NULL)
 750                 goto out_elf_end;
 751
 752         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 753                                           ".rela.plt", NULL);
 754         if (scn_plt_rel == NULL) {
 755                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 756                                                   ".rel.plt", NULL);
 757                 if (scn_plt_rel == NULL)
 758                         goto out_elf_end;
 759         }
 760
 761         err = -1;
 762
 763         if (shdr_rel_plt.sh_link != dynsym_idx)
 764                 goto out_elf_end;
 765
 766         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 767                 goto out_elf_end;
 768
 769         /*
 770          * Fetch the relocation section to find the idxes to the GOT
 771          * and the symbols in the .dynsym they refer to.
 772          */
 773         reldata = elf_getdata(scn_plt_rel, NULL);
 774         if (reldata == NULL)
 775                 goto out_elf_end;
 776
 777         syms = elf_getdata(scn_dynsym, NULL);
 778         if (syms == NULL)
 779                 goto out_elf_end;
 780
 781         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 782         if (scn_symstrs == NULL)
 783                 goto out_elf_end;
 784
 785         symstrs = elf_getdata(scn_symstrs, NULL);
 786         if (symstrs == NULL)
 787                 goto out_elf_end;
 788
 789         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 790         plt_offset = shdr_plt.sh_offset;
 791
 792         if (shdr_rel_plt.sh_type == SHT_RELA) {
 793                 GElf_Rela pos_mem, *pos;
 794
 795                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 796                                            nr_rel_entries) {
 797                         symidx = GELF_R_SYM(pos->r_info);
 798                         plt_offset += shdr_plt.sh_entsize;
 799                         gelf_getsym(syms, symidx, &sym);
 800                         snprintf(sympltname, sizeof(sympltname),
 801                                  "%s@plt", elf_sym__name(&sym, symstrs));
 802
 803                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 804                                         sympltname);
 805                         if (!f)
 806                                 goto out_elf_end;
 807
 808                         if (filter && filter(map, f))
 809                                 symbol__delete(f);
 810                         else {
 811                                 symbols__insert(&self->symbols[map->type], f);
 812                                 ++nr;
 813                         }
 814                 }
 815         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 816                 GElf_Rel pos_mem, *pos;
 817                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 818                                           nr_rel_entries) {
 819                         symidx = GELF_R_SYM(pos->r_info);
 820                         plt_offset += shdr_plt.sh_entsize;
 821                         gelf_getsym(syms, symidx, &sym);
 822                         snprintf(sympltname, sizeof(sympltname),
 823                                  "%s@plt", elf_sym__name(&sym, symstrs));
 824
 825                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 826                                         sympltname);
 827                         if (!f)
 828                                 goto out_elf_end;
 829
 830                         if (filter && filter(map, f))
 831                                 symbol__delete(f);
 832                         else {
 833                                 symbols__insert(&self->symbols[map->type], f);
 834                                 ++nr;
 835                         }
 836                 }
 837         }
 838
 839         err = 0;
 840 out_elf_end:
 841         elf_end(elf);
 842 out_close:
 843         close(fd);
 844
 845         if (err == 0)
 846                 return nr;
 847 out:
 848         pr_warning("%s: problems reading %s PLT info.\n",
 849                    __func__, self->long_name);
 850         return 0;
 851 }
 852
 853 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
 854 {
 855         switch (type) {
 856         case MAP__FUNCTION:
 857                 return elf_sym__is_function(self);
 858         case MAP__VARIABLE:
 859                 return elf_sym__is_object(self);
 860         default:
 861                 return false;
 862         }
 863 }
 864
 865 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
 866 {
 867         switch (type) {
 868         case MAP__FUNCTION:
 869                 return elf_sec__is_text(self, secstrs);
 870         case MAP__VARIABLE:
 871                 return elf_sec__is_data(self, secstrs);
 872         default:
 873                 return false;
 874         }
 875 }
 876
 877 static int dso__load_sym(struct dso *self, struct map *map,
 878                          struct map_groups *mg, const char *name, int fd,
 879                          symbol_filter_t filter, int kernel, int kmodule)
 880 {
 881         struct map *curr_map = map;
 882         struct dso *curr_dso = self;
 883         size_t dso_name_len = strlen(self->short_name);
 884         Elf_Data *symstrs, *secstrs;
 885         uint32_t nr_syms;
 886         int err = -1;
 887         uint32_t idx;
 888         GElf_Ehdr ehdr;
 889         GElf_Shdr shdr;
 890         Elf_Data *syms;
 891         GElf_Sym sym;
 892         Elf_Scn *sec, *sec_strndx;
 893         Elf *elf;
 894         int nr = 0;
 895
 896         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 897         if (elf == NULL) {
 898                 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
 899                 goto out_close;
 900         }
 901
 902         if (gelf_getehdr(elf, &ehdr) == NULL) {
 903                 pr_err("%s: cannot get elf header.\n", __func__);
 904                 goto out_elf_end;
 905         }
 906
 907         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 908         if (sec == NULL) {
 909                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 910                 if (sec == NULL)
 911                         goto out_elf_end;
 912         }
 913
 914         syms = elf_getdata(sec, NULL);
 915         if (syms == NULL)
 916                 goto out_elf_end;
 917
 918         sec = elf_getscn(elf, shdr.sh_link);
 919         if (sec == NULL)
 920                 goto out_elf_end;
 921
 922         symstrs = elf_getdata(sec, NULL);
 923         if (symstrs == NULL)
 924                 goto out_elf_end;
 925
 926         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 927         if (sec_strndx == NULL)
 928                 goto out_elf_end;
 929
 930         secstrs = elf_getdata(sec_strndx, NULL);
 931         if (secstrs == NULL)
 932                 goto out_elf_end;
 933
 934         nr_syms = shdr.sh_size / shdr.sh_entsize;
 935
 936         memset(&sym, 0, sizeof(sym));
 937         if (!kernel) {
 938                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 939                                 elf_section_by_name(elf, &ehdr, &shdr,
 940                                                      ".gnu.prelink_undo",
 941                                                      NULL) != NULL);
 942         } else self->adjust_symbols = 0;
 943
 944         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 945                 struct symbol *f;
 946                 const char *elf_name;
 947                 char *demangled = NULL;
 948                 int is_label = elf_sym__is_label(&sym);
 949                 const char *section_name;
 950
 951                 if (!is_label && !elf_sym__is_a(&sym, map->type))
 952                         continue;
 953
 954                 sec = elf_getscn(elf, sym.st_shndx);
 955                 if (!sec)
 956                         goto out_elf_end;
 957
 958                 gelf_getshdr(sec, &shdr);
 959
 960                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
 961                         continue;
 962
 963                 elf_name = elf_sym__name(&sym, symstrs);
 964                 section_name = elf_sec__name(&shdr, secstrs);
 965
 966                 if (kernel || kmodule) {
 967                         char dso_name[PATH_MAX];
 968
 969                         if (strcmp(section_name,
 970                                    curr_dso->short_name + dso_name_len) == 0)
 971                                 goto new_symbol;
 972
 973                         if (strcmp(section_name, ".text") == 0) {
 974                                 curr_map = map;
 975                                 curr_dso = self;
 976                                 goto new_symbol;
 977                         }
 978
 979                         snprintf(dso_name, sizeof(dso_name),
 980                                  "%s%s", self->short_name, section_name);
 981
 982                         curr_map = map_groups__find_by_name(mg, map->type, dso_name);
 983                         if (curr_map == NULL) {
 984                                 u64 start = sym.st_value;
 985
 986                                 if (kmodule)
 987                                         start += map->start + shdr.sh_offset;
 988
 989                                 curr_dso = dso__new(dso_name);
 990                                 if (curr_dso == NULL)
 991                                         goto out_elf_end;
 992                                 curr_map = map__new2(start, curr_dso,
 993                                                      MAP__FUNCTION);
 994                                 if (curr_map == NULL) {
 995                                         dso__delete(curr_dso);
 996                                         goto out_elf_end;
 997                                 }
 998                                 curr_map->map_ip = identity__map_ip;
 999                                 curr_map->unmap_ip = identity__map_ip;
1000                                 curr_dso->origin = DSO__ORIG_KERNEL;
1001                                 map_groups__insert(kmaps, curr_map);
1002                                 dsos__add(&dsos__kernel, curr_dso);
1003                         } else
1004                                 curr_dso = curr_map->dso;
1005
1006                         goto new_symbol;
1007                 }
1008
1009                 if (curr_dso->adjust_symbols) {
1010                         pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
1011                                   "%Lx sh_offset: %Lx\n", (u64)sym.st_value,
1012                                   (u64)shdr.sh_addr, (u64)shdr.sh_offset);
1013                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1014                 }
1015                 /*
1016                  * We need to figure out if the object was created from C++ sources
1017                  * DWARF DW_compile_unit has this, but we don't always have access
1018                  * to it...
1019                  */
1020                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1021                 if (demangled != NULL)
1022                         elf_name = demangled;
1023 new_symbol:
1024                 f = symbol__new(sym.st_value, sym.st_size, elf_name);
1025                 free(demangled);
1026                 if (!f)
1027                         goto out_elf_end;
1028
1029                 if (filter && filter(curr_map, f))
1030                         symbol__delete(f);
1031                 else {
1032                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1033                         nr++;
1034                 }
1035         }
1036
1037         /*
1038          * For misannotated, zeroed, ASM function sizes.
1039          */
1040         if (nr > 0)
1041                 symbols__fixup_end(&self->symbols[map->type]);
1042         err = nr;
1043 out_elf_end:
1044         elf_end(elf);
1045 out_close:
1046         return err;
1047 }
1048
1049 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1050 {
1051         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1052 }
1053
1054 static bool __dsos__read_build_ids(struct list_head *head)
1055 {
1056         bool have_build_id = false;
1057         struct dso *pos;
1058
1059         list_for_each_entry(pos, head, node)
1060                 if (filename__read_build_id(pos->long_name, pos->build_id,
1061                                             sizeof(pos->build_id)) > 0) {
1062                         have_build_id     = true;
1063                         pos->has_build_id = true;
1064                 }
1065
1066         return have_build_id;
1067 }
1068
1069 bool dsos__read_build_ids(void)
1070 {
1071         bool kbuildids = __dsos__read_build_ids(&dsos__kernel),
1072              ubuildids = __dsos__read_build_ids(&dsos__user);
1073         return kbuildids || ubuildids;
1074 }
1075
1076 /*
1077  * Align offset to 4 bytes as needed for note name and descriptor data.
1078  */
1079 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1080
1081 int filename__read_build_id(const char *filename, void *bf, size_t size)
1082 {
1083         int fd, err = -1;
1084         GElf_Ehdr ehdr;
1085         GElf_Shdr shdr;
1086         Elf_Data *data;
1087         Elf_Scn *sec;
1088         Elf_Kind ek;
1089         void *ptr;
1090         Elf *elf;
1091
1092         if (size < BUILD_ID_SIZE)
1093                 goto out;
1094
1095         fd = open(filename, O_RDONLY);
1096         if (fd < 0)
1097                 goto out;
1098
1099         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1100         if (elf == NULL) {
1101                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1102                 goto out_close;
1103         }
1104
1105         ek = elf_kind(elf);
1106         if (ek != ELF_K_ELF)
1107                 goto out_elf_end;
1108
1109         if (gelf_getehdr(elf, &ehdr) == NULL) {
1110                 pr_err("%s: cannot get elf header.\n", __func__);
1111                 goto out_elf_end;
1112         }
1113
1114         sec = elf_section_by_name(elf, &ehdr, &shdr,
1115                                   ".note.gnu.build-id", NULL);
1116         if (sec == NULL) {
1117                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1118                                           ".notes", NULL);
1119                 if (sec == NULL)
1120                         goto out_elf_end;
1121         }
1122
1123         data = elf_getdata(sec, NULL);
1124         if (data == NULL)
1125                 goto out_elf_end;
1126
1127         ptr = data->d_buf;
1128         while (ptr < (data->d_buf + data->d_size)) {
1129                 GElf_Nhdr *nhdr = ptr;
1130                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1131                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1132                 const char *name;
1133
1134                 ptr += sizeof(*nhdr);
1135                 name = ptr;
1136                 ptr += namesz;
1137                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1138                     nhdr->n_namesz == sizeof("GNU")) {
1139                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1140                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1141                                 err = BUILD_ID_SIZE;
1142                                 break;
1143                         }
1144                 }
1145                 ptr += descsz;
1146         }
1147 out_elf_end:
1148         elf_end(elf);
1149 out_close:
1150         close(fd);
1151 out:
1152         return err;
1153 }
1154
1155 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1156 {
1157         int fd, err = -1;
1158
1159         if (size < BUILD_ID_SIZE)
1160                 goto out;
1161
1162         fd = open(filename, O_RDONLY);
1163         if (fd < 0)
1164                 goto out;
1165
1166         while (1) {
1167                 char bf[BUFSIZ];
1168                 GElf_Nhdr nhdr;
1169                 int namesz, descsz;
1170
1171                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1172                         break;
1173
1174                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1175                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1176                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1177                     nhdr.n_namesz == sizeof("GNU")) {
1178                         if (read(fd, bf, namesz) != namesz)
1179                                 break;
1180                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1181                                 if (read(fd, build_id,
1182                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1183                                         err = 0;
1184                                         break;
1185                                 }
1186                         } else if (read(fd, bf, descsz) != descsz)
1187                                 break;
1188                 } else {
1189                         int n = namesz + descsz;
1190                         if (read(fd, bf, n) != n)
1191                                 break;
1192                 }
1193         }
1194         close(fd);
1195 out:
1196         return err;
1197 }
1198
1199 char dso__symtab_origin(const struct dso *self)
1200 {
1201         static const char origin[] = {
1202                 [DSO__ORIG_KERNEL] =   'k',
1203                 [DSO__ORIG_JAVA_JIT] = 'j',
1204                 [DSO__ORIG_FEDORA] =   'f',
1205                 [DSO__ORIG_UBUNTU] =   'u',
1206                 [DSO__ORIG_BUILDID] =  'b',
1207                 [DSO__ORIG_DSO] =      'd',
1208                 [DSO__ORIG_KMODULE] =  'K',
1209         };
1210
1211         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1212                 return '!';
1213         return origin[self->origin];
1214 }
1215
1216 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1217 {
1218         int size = PATH_MAX;
1219         char *name;
1220         u8 build_id[BUILD_ID_SIZE];
1221         int ret = -1;
1222         int fd;
1223
1224         dso__set_loaded(self, map->type);
1225
1226         if (self->kernel)
1227                 return dso__load_kernel_sym(self, map, kmaps, filter);
1228
1229         name = malloc(size);
1230         if (!name)
1231                 return -1;
1232
1233         self->adjust_symbols = 0;
1234
1235         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1236                 ret = dso__load_perf_map(self, map, filter);
1237                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1238                                          DSO__ORIG_NOT_FOUND;
1239                 return ret;
1240         }
1241
1242         self->origin = DSO__ORIG_FEDORA - 1;
1243
1244 more:
1245         do {
1246                 self->origin++;
1247                 switch (self->origin) {
1248                 case DSO__ORIG_FEDORA:
1249                         snprintf(name, size, "/usr/lib/debug%s.debug",
1250                                  self->long_name);
1251                         break;
1252                 case DSO__ORIG_UBUNTU:
1253                         snprintf(name, size, "/usr/lib/debug%s",
1254                                  self->long_name);
1255                         break;
1256                 case DSO__ORIG_BUILDID:
1257                         if (filename__read_build_id(self->long_name, build_id,
1258                                                     sizeof(build_id))) {
1259                                 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1260
1261                                 build_id__sprintf(build_id, sizeof(build_id),
1262                                                   build_id_hex);
1263                                 snprintf(name, size,
1264                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
1265                                         build_id_hex, build_id_hex + 2);
1266                                 if (self->has_build_id)
1267                                         goto compare_build_id;
1268                                 break;
1269                         }
1270                         self->origin++;
1271                         /* Fall thru */
1272                 case DSO__ORIG_DSO:
1273                         snprintf(name, size, "%s", self->long_name);
1274                         break;
1275
1276                 default:
1277                         goto out;
1278                 }
1279
1280                 if (self->has_build_id) {
1281                         if (filename__read_build_id(name, build_id,
1282                                                     sizeof(build_id)) < 0)
1283                                 goto more;
1284 compare_build_id:
1285                         if (!dso__build_id_equal(self, build_id))
1286                                 goto more;
1287                 }
1288
1289                 fd = open(name, O_RDONLY);
1290         } while (fd < 0);
1291
1292         ret = dso__load_sym(self, map, NULL, name, fd, filter, 0, 0);
1293         close(fd);
1294
1295         /*
1296          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1297          */
1298         if (!ret)
1299                 goto more;
1300
1301         if (ret > 0) {
1302                 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1303                 if (nr_plt > 0)
1304                         ret += nr_plt;
1305         }
1306 out:
1307         free(name);
1308         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1309                 return 0;
1310         return ret;
1311 }
1312
1313 struct map *map_groups__find_by_name(struct map_groups *self,
1314                                      enum map_type type, const char *name)
1315 {
1316         struct rb_node *nd;
1317
1318         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1319                 struct map *map = rb_entry(nd, struct map, rb_node);
1320
1321                 if (map->dso && strcmp(map->dso->name, name) == 0)
1322                         return map;
1323         }
1324
1325         return NULL;
1326 }
1327
1328 static int dsos__set_modules_path_dir(char *dirname)
1329 {
1330         struct dirent *dent;
1331         DIR *dir = opendir(dirname);
1332
1333         if (!dir) {
1334                 pr_debug("%s: cannot open %s dir\n", __func__, dirname);
1335                 return -1;
1336         }
1337
1338         while ((dent = readdir(dir)) != NULL) {
1339                 char path[PATH_MAX];
1340
1341                 if (dent->d_type == DT_DIR) {
1342                         if (!strcmp(dent->d_name, ".") ||
1343                             !strcmp(dent->d_name, ".."))
1344                                 continue;
1345
1346                         snprintf(path, sizeof(path), "%s/%s",
1347                                  dirname, dent->d_name);
1348                         if (dsos__set_modules_path_dir(path) < 0)
1349                                 goto failure;
1350                 } else {
1351                         char *dot = strrchr(dent->d_name, '.'),
1352                              dso_name[PATH_MAX];
1353                         struct map *map;
1354                         char *long_name;
1355
1356                         if (dot == NULL || strcmp(dot, ".ko"))
1357                                 continue;
1358                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1359                                  (int)(dot - dent->d_name), dent->d_name);
1360
1361                         strxfrchar(dso_name, '-', '_');
1362                         map = map_groups__find_by_name(kmaps, MAP__FUNCTION, dso_name);
1363                         if (map == NULL)
1364                                 continue;
1365
1366                         snprintf(path, sizeof(path), "%s/%s",
1367                                  dirname, dent->d_name);
1368
1369                         long_name = strdup(path);
1370                         if (long_name == NULL)
1371                                 goto failure;
1372                         dso__set_long_name(map->dso, long_name);
1373                 }
1374         }
1375
1376         return 0;
1377 failure:
1378         closedir(dir);
1379         return -1;
1380 }
1381
1382 static int dsos__set_modules_path(void)
1383 {
1384         struct utsname uts;
1385         char modules_path[PATH_MAX];
1386
1387         if (uname(&uts) < 0)
1388                 return -1;
1389
1390         snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1391                  uts.release);
1392
1393         return dsos__set_modules_path_dir(modules_path);
1394 }
1395
1396 /*
1397  * Constructor variant for modules (where we know from /proc/modules where
1398  * they are loaded) and for vmlinux, where only after we load all the
1399  * symbols we'll know where it starts and ends.
1400  */
1401 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1402 {
1403         struct map *self = malloc(sizeof(*self));
1404
1405         if (self != NULL) {
1406                 /*
1407                  * ->end will be filled after we load all the symbols
1408                  */
1409                 map__init(self, type, start, 0, 0, dso);
1410         }
1411
1412         return self;
1413 }
1414
1415 static int map_groups__create_module_maps(struct map_groups *self)
1416 {
1417         char *line = NULL;
1418         size_t n;
1419         FILE *file = fopen("/proc/modules", "r");
1420         struct map *map;
1421
1422         if (file == NULL)
1423                 return -1;
1424
1425         while (!feof(file)) {
1426                 char name[PATH_MAX];
1427                 u64 start;
1428                 struct dso *dso;
1429                 char *sep;
1430                 int line_len;
1431
1432                 line_len = getline(&line, &n, file);
1433                 if (line_len < 0)
1434                         break;
1435
1436                 if (!line)
1437                         goto out_failure;
1438
1439                 line[--line_len] = '\0'; /* \n */
1440
1441                 sep = strrchr(line, 'x');
1442                 if (sep == NULL)
1443                         continue;
1444
1445                 hex2u64(sep + 1, &start);
1446
1447                 sep = strchr(line, ' ');
1448                 if (sep == NULL)
1449                         continue;
1450
1451                 *sep = '\0';
1452
1453                 snprintf(name, sizeof(name), "[%s]", line);
1454                 dso = dso__new(name);
1455
1456                 if (dso == NULL)
1457                         goto out_delete_line;
1458
1459                 map = map__new2(start, dso, MAP__FUNCTION);
1460                 if (map == NULL) {
1461                         dso__delete(dso);
1462                         goto out_delete_line;
1463                 }
1464
1465                 snprintf(name, sizeof(name),
1466                          "/sys/module/%s/notes/.note.gnu.build-id", line);
1467                 if (sysfs__read_build_id(name, dso->build_id,
1468                                          sizeof(dso->build_id)) == 0)
1469                         dso->has_build_id = true;
1470
1471                 dso->origin = DSO__ORIG_KMODULE;
1472                 map_groups__insert(self, map);
1473                 dsos__add(&dsos__kernel, dso);
1474         }
1475
1476         free(line);
1477         fclose(file);
1478
1479         return dsos__set_modules_path();
1480
1481 out_delete_line:
1482         free(line);
1483 out_failure:
1484         return -1;
1485 }
1486
1487 static int dso__load_vmlinux(struct dso *self, struct map *map,
1488                              struct map_groups *mg,
1489                              const char *vmlinux, symbol_filter_t filter)
1490 {
1491         int err = -1, fd;
1492
1493         if (self->has_build_id) {
1494                 u8 build_id[BUILD_ID_SIZE];
1495
1496                 if (filename__read_build_id(vmlinux, build_id,
1497                                             sizeof(build_id)) < 0) {
1498                         pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1499                         return -1;
1500                 }
1501                 if (!dso__build_id_equal(self, build_id)) {
1502                         char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1503                              vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1504
1505                         build_id__sprintf(self->build_id,
1506                                           sizeof(self->build_id),
1507                                           expected_build_id);
1508                         build_id__sprintf(build_id, sizeof(build_id),
1509                                           vmlinux_build_id);
1510                         pr_debug("build_id in %s is %s while expected is %s, "
1511                                  "ignoring it\n", vmlinux, vmlinux_build_id,
1512                                  expected_build_id);
1513                         return -1;
1514                 }
1515         }
1516
1517         fd = open(vmlinux, O_RDONLY);
1518         if (fd < 0)
1519                 return -1;
1520
1521         dso__set_loaded(self, map->type);
1522         err = dso__load_sym(self, map, mg, self->long_name, fd, filter, 1, 0);
1523         close(fd);
1524
1525         return err;
1526 }
1527
1528 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1529                                 struct map_groups *mg, symbol_filter_t filter)
1530 {
1531         int err;
1532         bool is_kallsyms;
1533
1534         if (vmlinux_path != NULL) {
1535                 int i;
1536                 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1537                          vmlinux_path__nr_entries);
1538                 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1539                         err = dso__load_vmlinux(self, map, mg,
1540                                                 vmlinux_path[i], filter);
1541                         if (err > 0) {
1542                                 pr_debug("Using %s for symbols\n",
1543                                          vmlinux_path[i]);
1544                                 dso__set_long_name(self,
1545                                                    strdup(vmlinux_path[i]));
1546                                 goto out_fixup;
1547                         }
1548                 }
1549         }
1550
1551         is_kallsyms = self->long_name[0] == '[';
1552         if (is_kallsyms)
1553                 goto do_kallsyms;
1554
1555         err = dso__load_vmlinux(self, map, mg, self->long_name, filter);
1556         if (err <= 0) {
1557                 pr_info("The file %s cannot be used, "
1558                         "trying to use /proc/kallsyms...", self->long_name);
1559 do_kallsyms:
1560                 err = dso__load_kallsyms(self, map, mg, filter);
1561                 if (err > 0 && !is_kallsyms)
1562                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1563         }
1564
1565         if (err > 0) {
1566 out_fixup:
1567                 map__fixup_start(map);
1568                 map__fixup_end(map);
1569         }
1570
1571         return err;
1572 }
1573
1574 LIST_HEAD(dsos__user);
1575 LIST_HEAD(dsos__kernel);
1576 struct dso *vdso;
1577
1578 static void dsos__add(struct list_head *head, struct dso *dso)
1579 {
1580         list_add_tail(&dso->node, head);
1581 }
1582
1583 static struct dso *dsos__find(struct list_head *head, const char *name)
1584 {
1585         struct dso *pos;
1586
1587         list_for_each_entry(pos, head, node)
1588                 if (strcmp(pos->name, name) == 0)
1589                         return pos;
1590         return NULL;
1591 }
1592
1593 struct dso *dsos__findnew(const char *name)
1594 {
1595         struct dso *dso = dsos__find(&dsos__user, name);
1596
1597         if (!dso) {
1598                 dso = dso__new(name);
1599                 if (dso != NULL) {
1600                         dsos__add(&dsos__user, dso);
1601                         dso__set_basename(dso);
1602                 }
1603         }
1604
1605         return dso;
1606 }
1607
1608 static void __dsos__fprintf(struct list_head *head, FILE *fp)
1609 {
1610         struct dso *pos;
1611
1612         list_for_each_entry(pos, head, node) {
1613                 int i;
1614                 for (i = 0; i < MAP__NR_TYPES; ++i)
1615                         dso__fprintf(pos, i, fp);
1616         }
1617 }
1618
1619 void dsos__fprintf(FILE *fp)
1620 {
1621         __dsos__fprintf(&dsos__kernel, fp);
1622         __dsos__fprintf(&dsos__user, fp);
1623 }
1624
1625 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp)
1626 {
1627         struct dso *pos;
1628         size_t ret = 0;
1629
1630         list_for_each_entry(pos, head, node) {
1631                 ret += dso__fprintf_buildid(pos, fp);
1632                 ret += fprintf(fp, " %s\n", pos->long_name);
1633         }
1634         return ret;
1635 }
1636
1637 size_t dsos__fprintf_buildid(FILE *fp)
1638 {
1639         return (__dsos__fprintf_buildid(&dsos__kernel, fp) +
1640                 __dsos__fprintf_buildid(&dsos__user, fp));
1641 }
1642
1643 static struct dso *dsos__create_kernel( const char *vmlinux)
1644 {
1645         struct dso *kernel = dso__new(vmlinux ?: "[kernel.kallsyms]");
1646
1647         if (kernel == NULL)
1648                 return NULL;
1649
1650         kernel->short_name = "[kernel]";
1651         kernel->kernel     = 1;
1652
1653         vdso = dso__new("[vdso]");
1654         if (vdso == NULL)
1655                 goto out_delete_kernel_dso;
1656         dso__set_loaded(vdso, MAP__FUNCTION);
1657
1658         if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
1659                                  sizeof(kernel->build_id)) == 0)
1660                 kernel->has_build_id = true;
1661
1662         dsos__add(&dsos__kernel, kernel);
1663         dsos__add(&dsos__user, vdso);
1664
1665         return kernel;
1666
1667 out_delete_kernel_dso:
1668         dso__delete(kernel);
1669         return NULL;
1670 }
1671
1672 static int map_groups__create_kernel_maps(struct map_groups *self, const char *vmlinux)
1673 {
1674         struct map *functions, *variables;
1675         struct dso *kernel = dsos__create_kernel(vmlinux);
1676
1677         if (kernel == NULL)
1678                 return -1;
1679
1680         functions = map__new2(0, kernel, MAP__FUNCTION);
1681         if (functions == NULL)
1682                 return -1;
1683
1684         variables = map__new2(0, kernel, MAP__VARIABLE);
1685         if (variables == NULL) {
1686                 map__delete(functions);
1687                 return -1;
1688         }
1689
1690         functions->map_ip = functions->unmap_ip =
1691                 variables->map_ip = variables->unmap_ip = identity__map_ip;
1692         map_groups__insert(self, functions);
1693         map_groups__insert(self, variables);
1694
1695         return 0;
1696 }
1697
1698 static void vmlinux_path__exit(void)
1699 {
1700         while (--vmlinux_path__nr_entries >= 0) {
1701                 free(vmlinux_path[vmlinux_path__nr_entries]);
1702                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1703         }
1704
1705         free(vmlinux_path);
1706         vmlinux_path = NULL;
1707 }
1708
1709 static int vmlinux_path__init(void)
1710 {
1711         struct utsname uts;
1712         char bf[PATH_MAX];
1713
1714         if (uname(&uts) < 0)
1715                 return -1;
1716
1717         vmlinux_path = malloc(sizeof(char *) * 5);
1718         if (vmlinux_path == NULL)
1719                 return -1;
1720
1721         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1722         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1723                 goto out_fail;
1724         ++vmlinux_path__nr_entries;
1725         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1726         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1727                 goto out_fail;
1728         ++vmlinux_path__nr_entries;
1729         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1730         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1731         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1732                 goto out_fail;
1733         ++vmlinux_path__nr_entries;
1734         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1735         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1736         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1737                 goto out_fail;
1738         ++vmlinux_path__nr_entries;
1739         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1740                  uts.release);
1741         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1742         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1743                 goto out_fail;
1744         ++vmlinux_path__nr_entries;
1745
1746         return 0;
1747
1748 out_fail:
1749         vmlinux_path__exit();
1750         return -1;
1751 }
1752
1753 int symbol__init(struct symbol_conf *conf)
1754 {
1755         const struct symbol_conf *pconf = conf ?: &symbol_conf__defaults;
1756
1757         elf_version(EV_CURRENT);
1758         symbol__priv_size = pconf->priv_size;
1759         if (pconf->sort_by_name)
1760                 symbol__priv_size += (sizeof(struct symbol_name_rb_node) -
1761                                       sizeof(struct symbol));
1762         map_groups__init(kmaps);
1763
1764         if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
1765                 return -1;
1766
1767         if (map_groups__create_kernel_maps(kmaps, pconf->vmlinux_name) < 0) {
1768                 vmlinux_path__exit();
1769                 return -1;
1770         }
1771
1772         kmaps->use_modules = pconf->use_modules;
1773         if (pconf->use_modules && map_groups__create_module_maps(kmaps) < 0)
1774                 pr_debug("Failed to load list of modules in use, "
1775                          "continuing...\n");
1776         /*
1777          * Now that we have all the maps created, just set the ->end of them:
1778          */
1779         map_groups__fixup_end(kmaps);
1780         return 0;
1781 }