tools/perf/util/symbol.c

   1 #define _GNU_SOURCE
   2 #include <ctype.h>
   3 #include <dirent.h>
   4 #include <errno.h>
   5 #include <libgen.h>
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11 #include <sys/param.h>
  12 #include <fcntl.h>
  13 #include <unistd.h>
  14 #include <inttypes.h>
  15 #include "build-id.h"
  16 #include "debug.h"
  17 #include "symbol.h"
  18 #include "strlist.h"
  19
  20 #include <libelf.h>
  21 #include <gelf.h>
  22 #include <elf.h>
  23 #include <limits.h>
  24 #include <sys/utsname.h>
  25
  26 #ifndef KSYM_NAME_LEN
  27 #define KSYM_NAME_LEN 128
  28 #endif
  29
  30 #ifndef NT_GNU_BUILD_ID
  31 #define NT_GNU_BUILD_ID 3
  32 #endif
  33
  34 static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
  35 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
  36 static void dsos__add(struct list_head *head, struct dso *dso);
  37 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
  38 static int dso__load_kernel_sym(struct dso *self, struct map *map,
  39                                 symbol_filter_t filter);
  40 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
  41                         symbol_filter_t filter);
  42 static int vmlinux_path__nr_entries;
  43 static char **vmlinux_path;
  44
  45 struct symbol_conf symbol_conf = {
  46         .exclude_other    = true,
  47         .use_modules      = true,
  48         .try_vmlinux_path = true,
  49         .symfs            = "",
  50 };
  51
  52 int dso__name_len(const struct dso *self)
  53 {
  54         if (verbose)
  55                 return self->long_name_len;
  56
  57         return self->short_name_len;
  58 }
  59
  60 bool dso__loaded(const struct dso *self, enum map_type type)
  61 {
  62         return self->loaded & (1 << type);
  63 }
  64
  65 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
  66 {
  67         return self->sorted_by_name & (1 << type);
  68 }
  69
  70 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
  71 {
  72         self->sorted_by_name |= (1 << type);
  73 }
  74
  75 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  76 {
  77         switch (map_type) {
  78         case MAP__FUNCTION:
  79                 return symbol_type == 'T' || symbol_type == 'W';
  80         case MAP__VARIABLE:
  81                 return symbol_type == 'D' || symbol_type == 'd';
  82         default:
  83                 return false;
  84         }
  85 }
  86
  87 static void symbols__fixup_end(struct rb_root *self)
  88 {
  89         struct rb_node *nd, *prevnd = rb_first(self);
  90         struct symbol *curr, *prev;
  91
  92         if (prevnd == NULL)
  93                 return;
  94
  95         curr = rb_entry(prevnd, struct symbol, rb_node);
  96
  97         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  98                 prev = curr;
  99                 curr = rb_entry(nd, struct symbol, rb_node);
 100
 101                 if (prev->end == prev->start && prev->end != curr->start)
 102                         prev->end = curr->start - 1;
 103         }
 104
 105         /* Last entry */
 106         if (curr->end == curr->start)
 107                 curr->end = roundup(curr->start, 4096);
 108 }
 109
 110 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
 111 {
 112         struct map *prev, *curr;
 113         struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
 114
 115         if (prevnd == NULL)
 116                 return;
 117
 118         curr = rb_entry(prevnd, struct map, rb_node);
 119
 120         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 121                 prev = curr;
 122                 curr = rb_entry(nd, struct map, rb_node);
 123                 prev->end = curr->start - 1;
 124         }
 125
 126         /*
 127          * We still haven't the actual symbols, so guess the
 128          * last map final address.
 129          */
 130         curr->end = ~0ULL;
 131 }
 132
 133 static void map_groups__fixup_end(struct map_groups *self)
 134 {
 135         int i;
 136         for (i = 0; i < MAP__NR_TYPES; ++i)
 137                 __map_groups__fixup_end(self, i);
 138 }
 139
 140 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
 141                                   const char *name)
 142 {
 143         size_t namelen = strlen(name) + 1;
 144         struct symbol *self = calloc(1, (symbol_conf.priv_size +
 145                                          sizeof(*self) + namelen));
 146         if (self == NULL)
 147                 return NULL;
 148
 149         if (symbol_conf.priv_size)
 150                 self = ((void *)self) + symbol_conf.priv_size;
 151
 152         self->start   = start;
 153         self->end     = len ? start + len - 1 : start;
 154         self->binding = binding;
 155         self->namelen = namelen - 1;
 156
 157         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", __func__, name, start, self->end);
 158
 159         memcpy(self->name, name, namelen);
 160
 161         return self;
 162 }
 163
 164 void symbol__delete(struct symbol *self)
 165 {
 166         free(((void *)self) - symbol_conf.priv_size);
 167 }
 168
 169 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 170 {
 171         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
 172                        self->start, self->end,
 173                        self->binding == STB_GLOBAL ? 'g' :
 174                        self->binding == STB_LOCAL  ? 'l' : 'w',
 175                        self->name);
 176 }
 177
 178 void dso__set_long_name(struct dso *self, char *name)
 179 {
 180         if (name == NULL)
 181                 return;
 182         self->long_name = name;
 183         self->long_name_len = strlen(name);
 184 }
 185
 186 static void dso__set_short_name(struct dso *self, const char *name)
 187 {
 188         if (name == NULL)
 189                 return;
 190         self->short_name = name;
 191         self->short_name_len = strlen(name);
 192 }
 193
 194 static void dso__set_basename(struct dso *self)
 195 {
 196         dso__set_short_name(self, basename(self->long_name));
 197 }
 198
 199 struct dso *dso__new(const char *name)
 200 {
 201         struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
 202
 203         if (self != NULL) {
 204                 int i;
 205                 strcpy(self->name, name);
 206                 dso__set_long_name(self, self->name);
 207                 dso__set_short_name(self, self->name);
 208                 for (i = 0; i < MAP__NR_TYPES; ++i)
 209                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
 210                 self->slen_calculated = 0;
 211                 self->origin = DSO__ORIG_NOT_FOUND;
 212                 self->loaded = 0;
 213                 self->sorted_by_name = 0;
 214                 self->has_build_id = 0;
 215                 self->kernel = DSO_TYPE_USER;
 216                 INIT_LIST_HEAD(&self->node);
 217         }
 218
 219         return self;
 220 }
 221
 222 static void symbols__delete(struct rb_root *self)
 223 {
 224         struct symbol *pos;
 225         struct rb_node *next = rb_first(self);
 226
 227         while (next) {
 228                 pos = rb_entry(next, struct symbol, rb_node);
 229                 next = rb_next(&pos->rb_node);
 230                 rb_erase(&pos->rb_node, self);
 231                 symbol__delete(pos);
 232         }
 233 }
 234
 235 void dso__delete(struct dso *self)
 236 {
 237         int i;
 238         for (i = 0; i < MAP__NR_TYPES; ++i)
 239                 symbols__delete(&self->symbols[i]);
 240         if (self->sname_alloc)
 241                 free((char *)self->short_name);
 242         if (self->lname_alloc)
 243                 free(self->long_name);
 244         free(self);
 245 }
 246
 247 void dso__set_build_id(struct dso *self, void *build_id)
 248 {
 249         memcpy(self->build_id, build_id, sizeof(self->build_id));
 250         self->has_build_id = 1;
 251 }
 252
 253 static void symbols__insert(struct rb_root *self, struct symbol *sym)
 254 {
 255         struct rb_node **p = &self->rb_node;
 256         struct rb_node *parent = NULL;
 257         const u64 ip = sym->start;
 258         struct symbol *s;
 259
 260         while (*p != NULL) {
 261                 parent = *p;
 262                 s = rb_entry(parent, struct symbol, rb_node);
 263                 if (ip < s->start)
 264                         p = &(*p)->rb_left;
 265                 else
 266                         p = &(*p)->rb_right;
 267         }
 268         rb_link_node(&sym->rb_node, parent, p);
 269         rb_insert_color(&sym->rb_node, self);
 270 }
 271
 272 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
 273 {
 274         struct rb_node *n;
 275
 276         if (self == NULL)
 277                 return NULL;
 278
 279         n = self->rb_node;
 280
 281         while (n) {
 282                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 283
 284                 if (ip < s->start)
 285                         n = n->rb_left;
 286                 else if (ip > s->end)
 287                         n = n->rb_right;
 288                 else
 289                         return s;
 290         }
 291
 292         return NULL;
 293 }
 294
 295 struct symbol_name_rb_node {
 296         struct rb_node  rb_node;
 297         struct symbol   sym;
 298 };
 299
 300 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
 301 {
 302         struct rb_node **p = &self->rb_node;
 303         struct rb_node *parent = NULL;
 304         struct symbol_name_rb_node *symn, *s;
 305
 306         symn = container_of(sym, struct symbol_name_rb_node, sym);
 307
 308         while (*p != NULL) {
 309                 parent = *p;
 310                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 311                 if (strcmp(sym->name, s->sym.name) < 0)
 312                         p = &(*p)->rb_left;
 313                 else
 314                         p = &(*p)->rb_right;
 315         }
 316         rb_link_node(&symn->rb_node, parent, p);
 317         rb_insert_color(&symn->rb_node, self);
 318 }
 319
 320 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
 321 {
 322         struct rb_node *nd;
 323
 324         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 325                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 326                 symbols__insert_by_name(self, pos);
 327         }
 328 }
 329
 330 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
 331 {
 332         struct rb_node *n;
 333
 334         if (self == NULL)
 335                 return NULL;
 336
 337         n = self->rb_node;
 338
 339         while (n) {
 340                 struct symbol_name_rb_node *s;
 341                 int cmp;
 342
 343                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 344                 cmp = strcmp(name, s->sym.name);
 345
 346                 if (cmp < 0)
 347                         n = n->rb_left;
 348                 else if (cmp > 0)
 349                         n = n->rb_right;
 350                 else
 351                         return &s->sym;
 352         }
 353
 354         return NULL;
 355 }
 356
 357 struct symbol *dso__find_symbol(struct dso *self,
 358                                 enum map_type type, u64 addr)
 359 {
 360         return symbols__find(&self->symbols[type], addr);
 361 }
 362
 363 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 364                                         const char *name)
 365 {
 366         return symbols__find_by_name(&self->symbol_names[type], name);
 367 }
 368
 369 void dso__sort_by_name(struct dso *self, enum map_type type)
 370 {
 371         dso__set_sorted_by_name(self, type);
 372         return symbols__sort_by_name(&self->symbol_names[type],
 373                                      &self->symbols[type]);
 374 }
 375
 376 int build_id__sprintf(const u8 *self, int len, char *bf)
 377 {
 378         char *bid = bf;
 379         const u8 *raw = self;
 380         int i;
 381
 382         for (i = 0; i < len; ++i) {
 383                 sprintf(bid, "%02x", *raw);
 384                 ++raw;
 385                 bid += 2;
 386         }
 387
 388         return raw - self;
 389 }
 390
 391 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 392 {
 393         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 394
 395         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 396         return fprintf(fp, "%s", sbuild_id);
 397 }
 398
 399 size_t dso__fprintf_symbols_by_name(struct dso *self, enum map_type type, FILE *fp)
 400 {
 401         size_t ret = 0;
 402         struct rb_node *nd;
 403         struct symbol_name_rb_node *pos;
 404
 405         for (nd = rb_first(&self->symbol_names[type]); nd; nd = rb_next(nd)) {
 406                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 407                 fprintf(fp, "%s\n", pos->sym.name);
 408         }
 409
 410         return ret;
 411 }
 412
 413 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
 414 {
 415         struct rb_node *nd;
 416         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 417
 418         if (self->short_name != self->long_name)
 419                 ret += fprintf(fp, "%s, ", self->long_name);
 420         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
 421                        self->loaded ? "" : "NOT ");
 422         ret += dso__fprintf_buildid(self, fp);
 423         ret += fprintf(fp, ")\n");
 424         for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
 425                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 426                 ret += symbol__fprintf(pos, fp);
 427         }
 428
 429         return ret;
 430 }
 431
 432 int kallsyms__parse(const char *filename, void *arg,
 433                     int (*process_symbol)(void *arg, const char *name,
 434                                           char type, u64 start, u64 end))
 435 {
 436         char *line = NULL;
 437         size_t n;
 438         int err = -1;
 439         u64 prev_start = 0;
 440         char prev_symbol_type = 0;
 441         char *prev_symbol_name;
 442         FILE *file = fopen(filename, "r");
 443
 444         if (file == NULL)
 445                 goto out_failure;
 446
 447         prev_symbol_name = malloc(KSYM_NAME_LEN);
 448         if (prev_symbol_name == NULL)
 449                 goto out_close;
 450
 451         err = 0;
 452
 453         while (!feof(file)) {
 454                 u64 start;
 455                 int line_len, len;
 456                 char symbol_type;
 457                 char *symbol_name;
 458
 459                 line_len = getline(&line, &n, file);
 460                 if (line_len < 0 || !line)
 461                         break;
 462
 463                 line[--line_len] = '\0'; /* \n */
 464
 465                 len = hex2u64(line, &start);
 466
 467                 len++;
 468                 if (len + 2 >= line_len)
 469                         continue;
 470
 471                 symbol_type = toupper(line[len]);
 472                 len += 2;
 473                 symbol_name = line + len;
 474                 len = line_len - len;
 475
 476                 if (len >= KSYM_NAME_LEN) {
 477                         err = -1;
 478                         break;
 479                 }
 480
 481                 if (prev_symbol_type) {
 482                         u64 end = start;
 483                         if (end != prev_start)
 484                                 --end;
 485                         err = process_symbol(arg, prev_symbol_name,
 486                                              prev_symbol_type, prev_start, end);
 487                         if (err)
 488                                 break;
 489                 }
 490
 491                 memcpy(prev_symbol_name, symbol_name, len + 1);
 492                 prev_symbol_type = symbol_type;
 493                 prev_start = start;
 494         }
 495
 496         free(prev_symbol_name);
 497         free(line);
 498 out_close:
 499         fclose(file);
 500         return err;
 501
 502 out_failure:
 503         return -1;
 504 }
 505
 506 struct process_kallsyms_args {
 507         struct map *map;
 508         struct dso *dso;
 509 };
 510
 511 static u8 kallsyms2elf_type(char type)
 512 {
 513         if (type == 'W')
 514                 return STB_WEAK;
 515
 516         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
 517 }
 518
 519 static int map__process_kallsym_symbol(void *arg, const char *name,
 520                                        char type, u64 start, u64 end)
 521 {
 522         struct symbol *sym;
 523         struct process_kallsyms_args *a = arg;
 524         struct rb_root *root = &a->dso->symbols[a->map->type];
 525
 526         if (!symbol_type__is_a(type, a->map->type))
 527                 return 0;
 528
 529         sym = symbol__new(start, end - start + 1,
 530                           kallsyms2elf_type(type), name);
 531         if (sym == NULL)
 532                 return -ENOMEM;
 533         /*
 534          * We will pass the symbols to the filter later, in
 535          * map__split_kallsyms, when we have split the maps per module
 536          */
 537         symbols__insert(root, sym);
 538
 539         return 0;
 540 }
 541
 542 /*
 543  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 544  * so that we can in the next step set the symbol ->end address and then
 545  * call kernel_maps__split_kallsyms.
 546  */
 547 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
 548                                   struct map *map)
 549 {
 550         struct process_kallsyms_args args = { .map = map, .dso = self, };
 551         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 552 }
 553
 554 /*
 555  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 556  * kernel range is broken in several maps, named [kernel].N, as we don't have
 557  * the original ELF section names vmlinux have.
 558  */
 559 static int dso__split_kallsyms(struct dso *self, struct map *map,
 560                                symbol_filter_t filter)
 561 {
 562         struct map_groups *kmaps = map__kmap(map)->kmaps;
 563         struct machine *machine = kmaps->machine;
 564         struct map *curr_map = map;
 565         struct symbol *pos;
 566         int count = 0, moved = 0;
 567         struct rb_root *root = &self->symbols[map->type];
 568         struct rb_node *next = rb_first(root);
 569         int kernel_range = 0;
 570
 571         while (next) {
 572                 char *module;
 573
 574                 pos = rb_entry(next, struct symbol, rb_node);
 575                 next = rb_next(&pos->rb_node);
 576
 577                 module = strchr(pos->name, '\t');
 578                 if (module) {
 579                         if (!symbol_conf.use_modules)
 580                                 goto discard_symbol;
 581
 582                         *module++ = '\0';
 583
 584                         if (strcmp(curr_map->dso->short_name, module)) {
 585                                 if (curr_map != map &&
 586                                     self->kernel == DSO_TYPE_GUEST_KERNEL &&
 587                                     machine__is_default_guest(machine)) {
 588                                         /*
 589                                          * We assume all symbols of a module are
 590                                          * continuous in * kallsyms, so curr_map
 591                                          * points to a module and all its
 592                                          * symbols are in its kmap. Mark it as
 593                                          * loaded.
 594                                          */
 595                                         dso__set_loaded(curr_map->dso,
 596                                                         curr_map->type);
 597                                 }
 598
 599                                 curr_map = map_groups__find_by_name(kmaps,
 600                                                         map->type, module);
 601                                 if (curr_map == NULL) {
 602                                         pr_debug("%s/proc/{kallsyms,modules} "
 603                                                  "inconsistency while looking "
 604                                                  "for \"%s\" module!\n",
 605                                                  machine->root_dir, module);
 606                                         curr_map = map;
 607                                         goto discard_symbol;
 608                                 }
 609
 610                                 if (curr_map->dso->loaded &&
 611                                     !machine__is_default_guest(machine))
 612                                         goto discard_symbol;
 613                         }
 614                         /*
 615                          * So that we look just like we get from .ko files,
 616                          * i.e. not prelinked, relative to map->start.
 617                          */
 618                         pos->start = curr_map->map_ip(curr_map, pos->start);
 619                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 620                 } else if (curr_map != map) {
 621                         char dso_name[PATH_MAX];
 622                         struct dso *dso;
 623
 624                         if (count == 0) {
 625                                 curr_map = map;
 626                                 goto filter_symbol;
 627                         }
 628
 629                         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 630                                 snprintf(dso_name, sizeof(dso_name),
 631                                         "[guest.kernel].%d",
 632                                         kernel_range++);
 633                         else
 634                                 snprintf(dso_name, sizeof(dso_name),
 635                                         "[kernel].%d",
 636                                         kernel_range++);
 637
 638                         dso = dso__new(dso_name);
 639                         if (dso == NULL)
 640                                 return -1;
 641
 642                         dso->kernel = self->kernel;
 643
 644                         curr_map = map__new2(pos->start, dso, map->type);
 645                         if (curr_map == NULL) {
 646                                 dso__delete(dso);
 647                                 return -1;
 648                         }
 649
 650                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 651                         map_groups__insert(kmaps, curr_map);
 652                         ++kernel_range;
 653                 }
 654 filter_symbol:
 655                 if (filter && filter(curr_map, pos)) {
 656 discard_symbol:         rb_erase(&pos->rb_node, root);
 657                         symbol__delete(pos);
 658                 } else {
 659                         if (curr_map != map) {
 660                                 rb_erase(&pos->rb_node, root);
 661                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 662                                 ++moved;
 663                         } else
 664                                 ++count;
 665                 }
 666         }
 667
 668         if (curr_map != map &&
 669             self->kernel == DSO_TYPE_GUEST_KERNEL &&
 670             machine__is_default_guest(kmaps->machine)) {
 671                 dso__set_loaded(curr_map->dso, curr_map->type);
 672         }
 673
 674         return count + moved;
 675 }
 676
 677 int dso__load_kallsyms(struct dso *self, const char *filename,
 678                        struct map *map, symbol_filter_t filter)
 679 {
 680         if (dso__load_all_kallsyms(self, filename, map) < 0)
 681                 return -1;
 682
 683         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 684                 self->origin = DSO__ORIG_GUEST_KERNEL;
 685         else
 686                 self->origin = DSO__ORIG_KERNEL;
 687
 688         return dso__split_kallsyms(self, map, filter);
 689 }
 690
 691 static int dso__load_perf_map(struct dso *self, struct map *map,
 692                               symbol_filter_t filter)
 693 {
 694         char *line = NULL;
 695         size_t n;
 696         FILE *file;
 697         int nr_syms = 0;
 698
 699         file = fopen(self->long_name, "r");
 700         if (file == NULL)
 701                 goto out_failure;
 702
 703         while (!feof(file)) {
 704                 u64 start, size;
 705                 struct symbol *sym;
 706                 int line_len, len;
 707
 708                 line_len = getline(&line, &n, file);
 709                 if (line_len < 0)
 710                         break;
 711
 712                 if (!line)
 713                         goto out_failure;
 714
 715                 line[--line_len] = '\0'; /* \n */
 716
 717                 len = hex2u64(line, &start);
 718
 719                 len++;
 720                 if (len + 2 >= line_len)
 721                         continue;
 722
 723                 len += hex2u64(line + len, &size);
 724
 725                 len++;
 726                 if (len + 2 >= line_len)
 727                         continue;
 728
 729                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
 730
 731                 if (sym == NULL)
 732                         goto out_delete_line;
 733
 734                 if (filter && filter(map, sym))
 735                         symbol__delete(sym);
 736                 else {
 737                         symbols__insert(&self->symbols[map->type], sym);
 738                         nr_syms++;
 739                 }
 740         }
 741
 742         free(line);
 743         fclose(file);
 744
 745         return nr_syms;
 746
 747 out_delete_line:
 748         free(line);
 749 out_failure:
 750         return -1;
 751 }
 752
 753 /**
 754  * elf_symtab__for_each_symbol - iterate thru all the symbols
 755  *
 756  * @self: struct elf_symtab instance to iterate
 757  * @idx: uint32_t idx
 758  * @sym: GElf_Sym iterator
 759  */
 760 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 761         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 762              idx < nr_syms; \
 763              idx++, gelf_getsym(syms, idx, &sym))
 764
 765 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 766 {
 767         return GELF_ST_TYPE(sym->st_info);
 768 }
 769
 770 static inline int elf_sym__is_function(const GElf_Sym *sym)
 771 {
 772         return elf_sym__type(sym) == STT_FUNC &&
 773                sym->st_name != 0 &&
 774                sym->st_shndx != SHN_UNDEF;
 775 }
 776
 777 static inline bool elf_sym__is_object(const GElf_Sym *sym)
 778 {
 779         return elf_sym__type(sym) == STT_OBJECT &&
 780                 sym->st_name != 0 &&
 781                 sym->st_shndx != SHN_UNDEF;
 782 }
 783
 784 static inline int elf_sym__is_label(const GElf_Sym *sym)
 785 {
 786         return elf_sym__type(sym) == STT_NOTYPE &&
 787                 sym->st_name != 0 &&
 788                 sym->st_shndx != SHN_UNDEF &&
 789                 sym->st_shndx != SHN_ABS;
 790 }
 791
 792 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 793                                         const Elf_Data *secstrs)
 794 {
 795         return secstrs->d_buf + shdr->sh_name;
 796 }
 797
 798 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 799                                         const Elf_Data *secstrs)
 800 {
 801         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 802 }
 803
 804 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
 805                                     const Elf_Data *secstrs)
 806 {
 807         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
 808 }
 809
 810 static inline const char *elf_sym__name(const GElf_Sym *sym,
 811                                         const Elf_Data *symstrs)
 812 {
 813         return symstrs->d_buf + sym->st_name;
 814 }
 815
 816 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 817                                     GElf_Shdr *shp, const char *name,
 818                                     size_t *idx)
 819 {
 820         Elf_Scn *sec = NULL;
 821         size_t cnt = 1;
 822
 823         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 824                 char *str;
 825
 826                 gelf_getshdr(sec, shp);
 827                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 828                 if (!strcmp(name, str)) {
 829                         if (idx)
 830                                 *idx = cnt;
 831                         break;
 832                 }
 833                 ++cnt;
 834         }
 835
 836         return sec;
 837 }
 838
 839 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 840         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 841              idx < nr_entries; \
 842              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 843
 844 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 845         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 846              idx < nr_entries; \
 847              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 848
 849 /*
 850  * We need to check if we have a .dynsym, so that we can handle the
 851  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 852  * .dynsym or .symtab).
 853  * And always look at the original dso, not at debuginfo packages, that
 854  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 855  */
 856 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 857                                        symbol_filter_t filter)
 858 {
 859         uint32_t nr_rel_entries, idx;
 860         GElf_Sym sym;
 861         u64 plt_offset;
 862         GElf_Shdr shdr_plt;
 863         struct symbol *f;
 864         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 865         Elf_Data *reldata, *syms, *symstrs;
 866         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 867         size_t dynsym_idx;
 868         GElf_Ehdr ehdr;
 869         char sympltname[1024];
 870         Elf *elf;
 871         int nr = 0, symidx, fd, err = 0;
 872         char name[PATH_MAX];
 873
 874         snprintf(name, sizeof(name), "%s%s",
 875                  symbol_conf.symfs, self->long_name);
 876         fd = open(name, O_RDONLY);
 877         if (fd < 0)
 878                 goto out;
 879
 880         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 881         if (elf == NULL)
 882                 goto out_close;
 883
 884         if (gelf_getehdr(elf, &ehdr) == NULL)
 885                 goto out_elf_end;
 886
 887         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 888                                          ".dynsym", &dynsym_idx);
 889         if (scn_dynsym == NULL)
 890                 goto out_elf_end;
 891
 892         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 893                                           ".rela.plt", NULL);
 894         if (scn_plt_rel == NULL) {
 895                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 896                                                   ".rel.plt", NULL);
 897                 if (scn_plt_rel == NULL)
 898                         goto out_elf_end;
 899         }
 900
 901         err = -1;
 902
 903         if (shdr_rel_plt.sh_link != dynsym_idx)
 904                 goto out_elf_end;
 905
 906         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 907                 goto out_elf_end;
 908
 909         /*
 910          * Fetch the relocation section to find the idxes to the GOT
 911          * and the symbols in the .dynsym they refer to.
 912          */
 913         reldata = elf_getdata(scn_plt_rel, NULL);
 914         if (reldata == NULL)
 915                 goto out_elf_end;
 916
 917         syms = elf_getdata(scn_dynsym, NULL);
 918         if (syms == NULL)
 919                 goto out_elf_end;
 920
 921         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 922         if (scn_symstrs == NULL)
 923                 goto out_elf_end;
 924
 925         symstrs = elf_getdata(scn_symstrs, NULL);
 926         if (symstrs == NULL)
 927                 goto out_elf_end;
 928
 929         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 930         plt_offset = shdr_plt.sh_offset;
 931
 932         if (shdr_rel_plt.sh_type == SHT_RELA) {
 933                 GElf_Rela pos_mem, *pos;
 934
 935                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 936                                            nr_rel_entries) {
 937                         symidx = GELF_R_SYM(pos->r_info);
 938                         plt_offset += shdr_plt.sh_entsize;
 939                         gelf_getsym(syms, symidx, &sym);
 940                         snprintf(sympltname, sizeof(sympltname),
 941                                  "%s@plt", elf_sym__name(&sym, symstrs));
 942
 943                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 944                                         STB_GLOBAL, sympltname);
 945                         if (!f)
 946                                 goto out_elf_end;
 947
 948                         if (filter && filter(map, f))
 949                                 symbol__delete(f);
 950                         else {
 951                                 symbols__insert(&self->symbols[map->type], f);
 952                                 ++nr;
 953                         }
 954                 }
 955         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 956                 GElf_Rel pos_mem, *pos;
 957                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 958                                           nr_rel_entries) {
 959                         symidx = GELF_R_SYM(pos->r_info);
 960                         plt_offset += shdr_plt.sh_entsize;
 961                         gelf_getsym(syms, symidx, &sym);
 962                         snprintf(sympltname, sizeof(sympltname),
 963                                  "%s@plt", elf_sym__name(&sym, symstrs));
 964
 965                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 966                                         STB_GLOBAL, sympltname);
 967                         if (!f)
 968                                 goto out_elf_end;
 969
 970                         if (filter && filter(map, f))
 971                                 symbol__delete(f);
 972                         else {
 973                                 symbols__insert(&self->symbols[map->type], f);
 974                                 ++nr;
 975                         }
 976                 }
 977         }
 978
 979         err = 0;
 980 out_elf_end:
 981         elf_end(elf);
 982 out_close:
 983         close(fd);
 984
 985         if (err == 0)
 986                 return nr;
 987 out:
 988         pr_debug("%s: problems reading %s PLT info.\n",
 989                  __func__, self->long_name);
 990         return 0;
 991 }
 992
 993 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
 994 {
 995         switch (type) {
 996         case MAP__FUNCTION:
 997                 return elf_sym__is_function(self);
 998         case MAP__VARIABLE:
 999                 return elf_sym__is_object(self);
1000         default:
1001                 return false;
1002         }
1003 }
1004
1005 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
1006 {
1007         switch (type) {
1008         case MAP__FUNCTION:
1009                 return elf_sec__is_text(self, secstrs);
1010         case MAP__VARIABLE:
1011                 return elf_sec__is_data(self, secstrs);
1012         default:
1013                 return false;
1014         }
1015 }
1016
1017 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1018 {
1019         Elf_Scn *sec = NULL;
1020         GElf_Shdr shdr;
1021         size_t cnt = 1;
1022
1023         while ((sec = elf_nextscn(elf, sec)) != NULL) {
1024                 gelf_getshdr(sec, &shdr);
1025
1026                 if ((addr >= shdr.sh_addr) &&
1027                     (addr < (shdr.sh_addr + shdr.sh_size)))
1028                         return cnt;
1029
1030                 ++cnt;
1031         }
1032
1033         return -1;
1034 }
1035
1036 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
1037                          int fd, symbol_filter_t filter, int kmodule,
1038                          int want_symtab)
1039 {
1040         struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
1041         struct map *curr_map = map;
1042         struct dso *curr_dso = self;
1043         Elf_Data *symstrs, *secstrs;
1044         uint32_t nr_syms;
1045         int err = -1;
1046         uint32_t idx;
1047         GElf_Ehdr ehdr;
1048         GElf_Shdr shdr, opdshdr;
1049         Elf_Data *syms, *opddata = NULL;
1050         GElf_Sym sym;
1051         Elf_Scn *sec, *sec_strndx, *opdsec;
1052         Elf *elf;
1053         int nr = 0;
1054         size_t opdidx = 0;
1055
1056         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1057         if (elf == NULL) {
1058                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1059                 goto out_close;
1060         }
1061
1062         if (gelf_getehdr(elf, &ehdr) == NULL) {
1063                 pr_debug("%s: cannot get elf header.\n", __func__);
1064                 goto out_elf_end;
1065         }
1066
1067         /* Always reject images with a mismatched build-id: */
1068         if (self->has_build_id) {
1069                 u8 build_id[BUILD_ID_SIZE];
1070
1071                 if (elf_read_build_id(elf, build_id,
1072                                       BUILD_ID_SIZE) != BUILD_ID_SIZE)
1073                         goto out_elf_end;
1074
1075                 if (!dso__build_id_equal(self, build_id))
1076                         goto out_elf_end;
1077         }
1078
1079         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1080         if (sec == NULL) {
1081                 if (want_symtab)
1082                         goto out_elf_end;
1083
1084                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1085                 if (sec == NULL)
1086                         goto out_elf_end;
1087         }
1088
1089         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1090         if (opdsec)
1091                 opddata = elf_rawdata(opdsec, NULL);
1092
1093         syms = elf_getdata(sec, NULL);
1094         if (syms == NULL)
1095                 goto out_elf_end;
1096
1097         sec = elf_getscn(elf, shdr.sh_link);
1098         if (sec == NULL)
1099                 goto out_elf_end;
1100
1101         symstrs = elf_getdata(sec, NULL);
1102         if (symstrs == NULL)
1103                 goto out_elf_end;
1104
1105         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1106         if (sec_strndx == NULL)
1107                 goto out_elf_end;
1108
1109         secstrs = elf_getdata(sec_strndx, NULL);
1110         if (secstrs == NULL)
1111                 goto out_elf_end;
1112
1113         nr_syms = shdr.sh_size / shdr.sh_entsize;
1114
1115         memset(&sym, 0, sizeof(sym));
1116         if (self->kernel == DSO_TYPE_USER) {
1117                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1118                                 elf_section_by_name(elf, &ehdr, &shdr,
1119                                                      ".gnu.prelink_undo",
1120                                                      NULL) != NULL);
1121         } else self->adjust_symbols = 0;
1122
1123         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1124                 struct symbol *f;
1125                 const char *elf_name = elf_sym__name(&sym, symstrs);
1126                 char *demangled = NULL;
1127                 int is_label = elf_sym__is_label(&sym);
1128                 const char *section_name;
1129
1130                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1131                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1132                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1133
1134                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1135                         continue;
1136
1137                 /* Reject ARM ELF "mapping symbols": these aren't unique and
1138                  * don't identify functions, so will confuse the profile
1139                  * output: */
1140                 if (ehdr.e_machine == EM_ARM) {
1141                         if (!strcmp(elf_name, "$a") ||
1142                             !strcmp(elf_name, "$d") ||
1143                             !strcmp(elf_name, "$t"))
1144                                 continue;
1145                 }
1146
1147                 if (opdsec && sym.st_shndx == opdidx) {
1148                         u32 offset = sym.st_value - opdshdr.sh_addr;
1149                         u64 *opd = opddata->d_buf + offset;
1150                         sym.st_value = *opd;
1151                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1152                 }
1153
1154                 sec = elf_getscn(elf, sym.st_shndx);
1155                 if (!sec)
1156                         goto out_elf_end;
1157
1158                 gelf_getshdr(sec, &shdr);
1159
1160                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1161                         continue;
1162
1163                 section_name = elf_sec__name(&shdr, secstrs);
1164
1165                 /* On ARM, symbols for thumb functions have 1 added to
1166                  * the symbol address as a flag - remove it */
1167                 if ((ehdr.e_machine == EM_ARM) &&
1168                     (map->type == MAP__FUNCTION) &&
1169                     (sym.st_value & 1))
1170                         --sym.st_value;
1171
1172                 if (self->kernel != DSO_TYPE_USER || kmodule) {
1173                         char dso_name[PATH_MAX];
1174
1175                         if (strcmp(section_name,
1176                                    (curr_dso->short_name +
1177                                     self->short_name_len)) == 0)
1178                                 goto new_symbol;
1179
1180                         if (strcmp(section_name, ".text") == 0) {
1181                                 curr_map = map;
1182                                 curr_dso = self;
1183                                 goto new_symbol;
1184                         }
1185
1186                         snprintf(dso_name, sizeof(dso_name),
1187                                  "%s%s", self->short_name, section_name);
1188
1189                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1190                         if (curr_map == NULL) {
1191                                 u64 start = sym.st_value;
1192
1193                                 if (kmodule)
1194                                         start += map->start + shdr.sh_offset;
1195
1196                                 curr_dso = dso__new(dso_name);
1197                                 if (curr_dso == NULL)
1198                                         goto out_elf_end;
1199                                 curr_dso->kernel = self->kernel;
1200                                 curr_map = map__new2(start, curr_dso,
1201                                                      map->type);
1202                                 if (curr_map == NULL) {
1203                                         dso__delete(curr_dso);
1204                                         goto out_elf_end;
1205                                 }
1206                                 curr_map->map_ip = identity__map_ip;
1207                                 curr_map->unmap_ip = identity__map_ip;
1208                                 curr_dso->origin = self->origin;
1209                                 map_groups__insert(kmap->kmaps, curr_map);
1210                                 dsos__add(&self->node, curr_dso);
1211                                 dso__set_loaded(curr_dso, map->type);
1212                         } else
1213                                 curr_dso = curr_map->dso;
1214
1215                         goto new_symbol;
1216                 }
1217
1218                 if (curr_dso->adjust_symbols) {
1219                         pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1220                                   "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1221                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1222                                   (u64)shdr.sh_offset);
1223                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1224                 }
1225                 /*
1226                  * We need to figure out if the object was created from C++ sources
1227                  * DWARF DW_compile_unit has this, but we don't always have access
1228                  * to it...
1229                  */
1230                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1231                 if (demangled != NULL)
1232                         elf_name = demangled;
1233 new_symbol:
1234                 f = symbol__new(sym.st_value, sym.st_size,
1235                                 GELF_ST_BIND(sym.st_info), elf_name);
1236                 free(demangled);
1237                 if (!f)
1238                         goto out_elf_end;
1239
1240                 if (filter && filter(curr_map, f))
1241                         symbol__delete(f);
1242                 else {
1243                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1244                         nr++;
1245                 }
1246         }
1247
1248         /*
1249          * For misannotated, zeroed, ASM function sizes.
1250          */
1251         if (nr > 0) {
1252                 symbols__fixup_end(&self->symbols[map->type]);
1253                 if (kmap) {
1254                         /*
1255                          * We need to fixup this here too because we create new
1256                          * maps here, for things like vsyscall sections.
1257                          */
1258                         __map_groups__fixup_end(kmap->kmaps, map->type);
1259                 }
1260         }
1261         err = nr;
1262 out_elf_end:
1263         elf_end(elf);
1264 out_close:
1265         return err;
1266 }
1267
1268 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1269 {
1270         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1271 }
1272
1273 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1274 {
1275         bool have_build_id = false;
1276         struct dso *pos;
1277
1278         list_for_each_entry(pos, head, node) {
1279                 if (with_hits && !pos->hit)
1280                         continue;
1281                 if (pos->has_build_id) {
1282                         have_build_id = true;
1283                         continue;
1284                 }
1285                 if (filename__read_build_id(pos->long_name, pos->build_id,
1286                                             sizeof(pos->build_id)) > 0) {
1287                         have_build_id     = true;
1288                         pos->has_build_id = true;
1289                 }
1290         }
1291
1292         return have_build_id;
1293 }
1294
1295 /*
1296  * Align offset to 4 bytes as needed for note name and descriptor data.
1297  */
1298 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1299
1300 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1301 {
1302         int err = -1;
1303         GElf_Ehdr ehdr;
1304         GElf_Shdr shdr;
1305         Elf_Data *data;
1306         Elf_Scn *sec;
1307         Elf_Kind ek;
1308         void *ptr;
1309
1310         if (size < BUILD_ID_SIZE)
1311                 goto out;
1312
1313         ek = elf_kind(elf);
1314         if (ek != ELF_K_ELF)
1315                 goto out;
1316
1317         if (gelf_getehdr(elf, &ehdr) == NULL) {
1318                 pr_err("%s: cannot get elf header.\n", __func__);
1319                 goto out;
1320         }
1321
1322         sec = elf_section_by_name(elf, &ehdr, &shdr,
1323                                   ".note.gnu.build-id", NULL);
1324         if (sec == NULL) {
1325                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1326                                           ".notes", NULL);
1327                 if (sec == NULL)
1328                         goto out;
1329         }
1330
1331         data = elf_getdata(sec, NULL);
1332         if (data == NULL)
1333                 goto out;
1334
1335         ptr = data->d_buf;
1336         while (ptr < (data->d_buf + data->d_size)) {
1337                 GElf_Nhdr *nhdr = ptr;
1338                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1339                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1340                 const char *name;
1341
1342                 ptr += sizeof(*nhdr);
1343                 name = ptr;
1344                 ptr += namesz;
1345                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1346                     nhdr->n_namesz == sizeof("GNU")) {
1347                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1348                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1349                                 err = BUILD_ID_SIZE;
1350                                 break;
1351                         }
1352                 }
1353                 ptr += descsz;
1354         }
1355
1356 out:
1357         return err;
1358 }
1359
1360 int filename__read_build_id(const char *filename, void *bf, size_t size)
1361 {
1362         int fd, err = -1;
1363         Elf *elf;
1364
1365         if (size < BUILD_ID_SIZE)
1366                 goto out;
1367
1368         fd = open(filename, O_RDONLY);
1369         if (fd < 0)
1370                 goto out;
1371
1372         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1373         if (elf == NULL) {
1374                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1375                 goto out_close;
1376         }
1377
1378         err = elf_read_build_id(elf, bf, size);
1379
1380         elf_end(elf);
1381 out_close:
1382         close(fd);
1383 out:
1384         return err;
1385 }
1386
1387 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1388 {
1389         int fd, err = -1;
1390
1391         if (size < BUILD_ID_SIZE)
1392                 goto out;
1393
1394         fd = open(filename, O_RDONLY);
1395         if (fd < 0)
1396                 goto out;
1397
1398         while (1) {
1399                 char bf[BUFSIZ];
1400                 GElf_Nhdr nhdr;
1401                 int namesz, descsz;
1402
1403                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1404                         break;
1405
1406                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1407                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1408                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1409                     nhdr.n_namesz == sizeof("GNU")) {
1410                         if (read(fd, bf, namesz) != namesz)
1411                                 break;
1412                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1413                                 if (read(fd, build_id,
1414                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1415                                         err = 0;
1416                                         break;
1417                                 }
1418                         } else if (read(fd, bf, descsz) != descsz)
1419                                 break;
1420                 } else {
1421                         int n = namesz + descsz;
1422                         if (read(fd, bf, n) != n)
1423                                 break;
1424                 }
1425         }
1426         close(fd);
1427 out:
1428         return err;
1429 }
1430
1431 char dso__symtab_origin(const struct dso *self)
1432 {
1433         static const char origin[] = {
1434                 [DSO__ORIG_KERNEL] =   'k',
1435                 [DSO__ORIG_JAVA_JIT] = 'j',
1436                 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1437                 [DSO__ORIG_FEDORA] =   'f',
1438                 [DSO__ORIG_UBUNTU] =   'u',
1439                 [DSO__ORIG_BUILDID] =  'b',
1440                 [DSO__ORIG_DSO] =      'd',
1441                 [DSO__ORIG_KMODULE] =  'K',
1442                 [DSO__ORIG_GUEST_KERNEL] =  'g',
1443                 [DSO__ORIG_GUEST_KMODULE] =  'G',
1444         };
1445
1446         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1447                 return '!';
1448         return origin[self->origin];
1449 }
1450
1451 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1452 {
1453         int size = PATH_MAX;
1454         char *name;
1455         int ret = -1;
1456         int fd;
1457         struct machine *machine;
1458         const char *root_dir;
1459         int want_symtab;
1460
1461         dso__set_loaded(self, map->type);
1462
1463         if (self->kernel == DSO_TYPE_KERNEL)
1464                 return dso__load_kernel_sym(self, map, filter);
1465         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1466                 return dso__load_guest_kernel_sym(self, map, filter);
1467
1468         if (map->groups && map->groups->machine)
1469                 machine = map->groups->machine;
1470         else
1471                 machine = NULL;
1472
1473         name = malloc(size);
1474         if (!name)
1475                 return -1;
1476
1477         self->adjust_symbols = 0;
1478
1479         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1480                 ret = dso__load_perf_map(self, map, filter);
1481                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1482                                          DSO__ORIG_NOT_FOUND;
1483                 return ret;
1484         }
1485
1486         /* Iterate over candidate debug images.
1487          * On the first pass, only load images if they have a full symtab.
1488          * Failing that, do a second pass where we accept .dynsym also
1489          */
1490         for (self->origin = DSO__ORIG_BUILD_ID_CACHE, want_symtab = 1;
1491              self->origin != DSO__ORIG_NOT_FOUND;
1492              self->origin++) {
1493                 switch (self->origin) {
1494                 case DSO__ORIG_BUILD_ID_CACHE:
1495                         /* skip the locally configured cache if a symfs is given */
1496                         if (symbol_conf.symfs[0] ||
1497                             (dso__build_id_filename(self, name, size) == NULL)) {
1498                                 continue;
1499                         }
1500                         break;
1501                 case DSO__ORIG_FEDORA:
1502                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1503                                  symbol_conf.symfs, self->long_name);
1504                         break;
1505                 case DSO__ORIG_UBUNTU:
1506                         snprintf(name, size, "%s/usr/lib/debug%s",
1507                                  symbol_conf.symfs, self->long_name);
1508                         break;
1509                 case DSO__ORIG_BUILDID: {
1510                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1511
1512                         if (!self->has_build_id)
1513                                 continue;
1514
1515                         build_id__sprintf(self->build_id,
1516                                           sizeof(self->build_id),
1517                                           build_id_hex);
1518                         snprintf(name, size,
1519                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1520                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1521                         }
1522                         break;
1523                 case DSO__ORIG_DSO:
1524                         snprintf(name, size, "%s%s",
1525                              symbol_conf.symfs, self->long_name);
1526                         break;
1527                 case DSO__ORIG_GUEST_KMODULE:
1528                         if (map->groups && map->groups->machine)
1529                                 root_dir = map->groups->machine->root_dir;
1530                         else
1531                                 root_dir = "";
1532                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1533                                  root_dir, self->long_name);
1534                         break;
1535
1536                 case DSO__ORIG_KMODULE:
1537                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1538                                  self->long_name);
1539                         break;
1540
1541                 default:
1542                         /*
1543                          * If we wanted a full symtab but no image had one,
1544                          * relax our requirements and repeat the search.
1545                          */
1546                         if (want_symtab) {
1547                                 want_symtab = 0;
1548                                 self->origin = DSO__ORIG_BUILD_ID_CACHE;
1549                         } else
1550                                 continue;
1551                 }
1552
1553                 /* Name is now the name of the next image to try */
1554                 fd = open(name, O_RDONLY);
1555                 if (fd < 0)
1556                         continue;
1557
1558                 ret = dso__load_sym(self, map, name, fd, filter, 0,
1559                                     want_symtab);
1560                 close(fd);
1561
1562                 /*
1563                  * Some people seem to have debuginfo files _WITHOUT_ debug
1564                  * info!?!?
1565                  */
1566                 if (!ret)
1567                         continue;
1568
1569                 if (ret > 0) {
1570                         int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1571                         if (nr_plt > 0)
1572                                 ret += nr_plt;
1573                         break;
1574                 }
1575         }
1576
1577         free(name);
1578         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1579                 return 0;
1580         return ret;
1581 }
1582
1583 struct map *map_groups__find_by_name(struct map_groups *self,
1584                                      enum map_type type, const char *name)
1585 {
1586         struct rb_node *nd;
1587
1588         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1589                 struct map *map = rb_entry(nd, struct map, rb_node);
1590
1591                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1592                         return map;
1593         }
1594
1595         return NULL;
1596 }
1597
1598 static int dso__kernel_module_get_build_id(struct dso *self,
1599                                 const char *root_dir)
1600 {
1601         char filename[PATH_MAX];
1602         /*
1603          * kernel module short names are of the form "[module]" and
1604          * we need just "module" here.
1605          */
1606         const char *name = self->short_name + 1;
1607
1608         snprintf(filename, sizeof(filename),
1609                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1610                  root_dir, (int)strlen(name) - 1, name);
1611
1612         if (sysfs__read_build_id(filename, self->build_id,
1613                                  sizeof(self->build_id)) == 0)
1614                 self->has_build_id = true;
1615
1616         return 0;
1617 }
1618
1619 static int map_groups__set_modules_path_dir(struct map_groups *self,
1620                                 const char *dir_name)
1621 {
1622         struct dirent *dent;
1623         DIR *dir = opendir(dir_name);
1624         int ret = 0;
1625
1626         if (!dir) {
1627                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1628                 return -1;
1629         }
1630
1631         while ((dent = readdir(dir)) != NULL) {
1632                 char path[PATH_MAX];
1633                 struct stat st;
1634
1635                 /*sshfs might return bad dent->d_type, so we have to stat*/
1636                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1637                 if (stat(path, &st))
1638                         continue;
1639
1640                 if (S_ISDIR(st.st_mode)) {
1641                         if (!strcmp(dent->d_name, ".") ||
1642                             !strcmp(dent->d_name, ".."))
1643                                 continue;
1644
1645                         snprintf(path, sizeof(path), "%s/%s",
1646                                  dir_name, dent->d_name);
1647                         ret = map_groups__set_modules_path_dir(self, path);
1648                         if (ret < 0)
1649                                 goto out;
1650                 } else {
1651                         char *dot = strrchr(dent->d_name, '.'),
1652                              dso_name[PATH_MAX];
1653                         struct map *map;
1654                         char *long_name;
1655
1656                         if (dot == NULL || strcmp(dot, ".ko"))
1657                                 continue;
1658                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1659                                  (int)(dot - dent->d_name), dent->d_name);
1660
1661                         strxfrchar(dso_name, '-', '_');
1662                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1663                         if (map == NULL)
1664                                 continue;
1665
1666                         snprintf(path, sizeof(path), "%s/%s",
1667                                  dir_name, dent->d_name);
1668
1669                         long_name = strdup(path);
1670                         if (long_name == NULL) {
1671                                 ret = -1;
1672                                 goto out;
1673                         }
1674                         dso__set_long_name(map->dso, long_name);
1675                         map->dso->lname_alloc = 1;
1676                         dso__kernel_module_get_build_id(map->dso, "");
1677                 }
1678         }
1679
1680 out:
1681         closedir(dir);
1682         return ret;
1683 }
1684
1685 static char *get_kernel_version(const char *root_dir)
1686 {
1687         char version[PATH_MAX];
1688         FILE *file;
1689         char *name, *tmp;
1690         const char *prefix = "Linux version ";
1691
1692         sprintf(version, "%s/proc/version", root_dir);
1693         file = fopen(version, "r");
1694         if (!file)
1695                 return NULL;
1696
1697         version[0] = '\0';
1698         tmp = fgets(version, sizeof(version), file);
1699         fclose(file);
1700
1701         name = strstr(version, prefix);
1702         if (!name)
1703                 return NULL;
1704         name += strlen(prefix);
1705         tmp = strchr(name, ' ');
1706         if (tmp)
1707                 *tmp = '\0';
1708
1709         return strdup(name);
1710 }
1711
1712 static int machine__set_modules_path(struct machine *self)
1713 {
1714         char *version;
1715         char modules_path[PATH_MAX];
1716
1717         version = get_kernel_version(self->root_dir);
1718         if (!version)
1719                 return -1;
1720
1721         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1722                  self->root_dir, version);
1723         free(version);
1724
1725         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1726 }
1727
1728 /*
1729  * Constructor variant for modules (where we know from /proc/modules where
1730  * they are loaded) and for vmlinux, where only after we load all the
1731  * symbols we'll know where it starts and ends.
1732  */
1733 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1734 {
1735         struct map *self = calloc(1, (sizeof(*self) +
1736                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1737         if (self != NULL) {
1738                 /*
1739                  * ->end will be filled after we load all the symbols
1740                  */
1741                 map__init(self, type, start, 0, 0, dso);
1742         }
1743
1744         return self;
1745 }
1746
1747 struct map *machine__new_module(struct machine *self, u64 start,
1748                                 const char *filename)
1749 {
1750         struct map *map;
1751         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1752
1753         if (dso == NULL)
1754                 return NULL;
1755
1756         map = map__new2(start, dso, MAP__FUNCTION);
1757         if (map == NULL)
1758                 return NULL;
1759
1760         if (machine__is_host(self))
1761                 dso->origin = DSO__ORIG_KMODULE;
1762         else
1763                 dso->origin = DSO__ORIG_GUEST_KMODULE;
1764         map_groups__insert(&self->kmaps, map);
1765         return map;
1766 }
1767
1768 static int machine__create_modules(struct machine *self)
1769 {
1770         char *line = NULL;
1771         size_t n;
1772         FILE *file;
1773         struct map *map;
1774         const char *modules;
1775         char path[PATH_MAX];
1776
1777         if (machine__is_default_guest(self))
1778                 modules = symbol_conf.default_guest_modules;
1779         else {
1780                 sprintf(path, "%s/proc/modules", self->root_dir);
1781                 modules = path;
1782         }
1783
1784         file = fopen(modules, "r");
1785         if (file == NULL)
1786                 return -1;
1787
1788         while (!feof(file)) {
1789                 char name[PATH_MAX];
1790                 u64 start;
1791                 char *sep;
1792                 int line_len;
1793
1794                 line_len = getline(&line, &n, file);
1795                 if (line_len < 0)
1796                         break;
1797
1798                 if (!line)
1799                         goto out_failure;
1800
1801                 line[--line_len] = '\0'; /* \n */
1802
1803                 sep = strrchr(line, 'x');
1804                 if (sep == NULL)
1805                         continue;
1806
1807                 hex2u64(sep + 1, &start);
1808
1809                 sep = strchr(line, ' ');
1810                 if (sep == NULL)
1811                         continue;
1812
1813                 *sep = '\0';
1814
1815                 snprintf(name, sizeof(name), "[%s]", line);
1816                 map = machine__new_module(self, start, name);
1817                 if (map == NULL)
1818                         goto out_delete_line;
1819                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1820         }
1821
1822         free(line);
1823         fclose(file);
1824
1825         return machine__set_modules_path(self);
1826
1827 out_delete_line:
1828         free(line);
1829 out_failure:
1830         return -1;
1831 }
1832
1833 int dso__load_vmlinux(struct dso *self, struct map *map,
1834                       const char *vmlinux, symbol_filter_t filter)
1835 {
1836         int err = -1, fd;
1837         char symfs_vmlinux[PATH_MAX];
1838
1839         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
1840                  symbol_conf.symfs, vmlinux);
1841         fd = open(symfs_vmlinux, O_RDONLY);
1842         if (fd < 0)
1843                 return -1;
1844
1845         dso__set_loaded(self, map->type);
1846         err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
1847         close(fd);
1848
1849         if (err > 0)
1850                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1851
1852         return err;
1853 }
1854
1855 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1856                            symbol_filter_t filter)
1857 {
1858         int i, err = 0;
1859         char *filename;
1860
1861         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1862                  vmlinux_path__nr_entries + 1);
1863
1864         filename = dso__build_id_filename(self, NULL, 0);
1865         if (filename != NULL) {
1866                 err = dso__load_vmlinux(self, map, filename, filter);
1867                 if (err > 0) {
1868                         dso__set_long_name(self, filename);
1869                         goto out;
1870                 }
1871                 free(filename);
1872         }
1873
1874         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1875                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1876                 if (err > 0) {
1877                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1878                         break;
1879                 }
1880         }
1881 out:
1882         return err;
1883 }
1884
1885 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1886                                 symbol_filter_t filter)
1887 {
1888         int err;
1889         const char *kallsyms_filename = NULL;
1890         char *kallsyms_allocated_filename = NULL;
1891         /*
1892          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1893          * it and only it, reporting errors to the user if it cannot be used.
1894          *
1895          * For instance, try to analyse an ARM perf.data file _without_ a
1896          * build-id, or if the user specifies the wrong path to the right
1897          * vmlinux file, obviously we can't fallback to another vmlinux (a
1898          * x86_86 one, on the machine where analysis is being performed, say),
1899          * or worse, /proc/kallsyms.
1900          *
1901          * If the specified file _has_ a build-id and there is a build-id
1902          * section in the perf.data file, we will still do the expected
1903          * validation in dso__load_vmlinux and will bail out if they don't
1904          * match.
1905          */
1906         if (symbol_conf.kallsyms_name != NULL) {
1907                 kallsyms_filename = symbol_conf.kallsyms_name;
1908                 goto do_kallsyms;
1909         }
1910
1911         if (symbol_conf.vmlinux_name != NULL) {
1912                 err = dso__load_vmlinux(self, map,
1913                                         symbol_conf.vmlinux_name, filter);
1914                 if (err > 0) {
1915                         dso__set_long_name(self,
1916                                            strdup(symbol_conf.vmlinux_name));
1917                         goto out_fixup;
1918                 }
1919                 return err;
1920         }
1921
1922         if (vmlinux_path != NULL) {
1923                 err = dso__load_vmlinux_path(self, map, filter);
1924                 if (err > 0)
1925                         goto out_fixup;
1926         }
1927
1928         /* do not try local files if a symfs was given */
1929         if (symbol_conf.symfs[0] != 0)
1930                 return -1;
1931
1932         /*
1933          * Say the kernel DSO was created when processing the build-id header table,
1934          * we have a build-id, so check if it is the same as the running kernel,
1935          * using it if it is.
1936          */
1937         if (self->has_build_id) {
1938                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1939                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1940
1941                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1942                                          sizeof(kallsyms_build_id)) == 0) {
1943                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1944                                 kallsyms_filename = "/proc/kallsyms";
1945                                 goto do_kallsyms;
1946                         }
1947                 }
1948                 /*
1949                  * Now look if we have it on the build-id cache in
1950                  * $HOME/.debug/[kernel.kallsyms].
1951                  */
1952                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1953                                   sbuild_id);
1954
1955                 if (asprintf(&kallsyms_allocated_filename,
1956                              "%s/.debug/[kernel.kallsyms]/%s",
1957                              getenv("HOME"), sbuild_id) == -1) {
1958                         pr_err("Not enough memory for kallsyms file lookup\n");
1959                         return -1;
1960                 }
1961
1962                 kallsyms_filename = kallsyms_allocated_filename;
1963
1964                 if (access(kallsyms_filename, F_OK)) {
1965                         pr_err("No kallsyms or vmlinux with build-id %s "
1966                                "was found\n", sbuild_id);
1967                         free(kallsyms_allocated_filename);
1968                         return -1;
1969                 }
1970         } else {
1971                 /*
1972                  * Last resort, if we don't have a build-id and couldn't find
1973                  * any vmlinux file, try the running kernel kallsyms table.
1974                  */
1975                 kallsyms_filename = "/proc/kallsyms";
1976         }
1977
1978 do_kallsyms:
1979         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1980         if (err > 0)
1981                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1982         free(kallsyms_allocated_filename);
1983
1984         if (err > 0) {
1985 out_fixup:
1986                 if (kallsyms_filename != NULL)
1987                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1988                 map__fixup_start(map);
1989                 map__fixup_end(map);
1990         }
1991
1992         return err;
1993 }
1994
1995 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1996                                 symbol_filter_t filter)
1997 {
1998         int err;
1999         const char *kallsyms_filename = NULL;
2000         struct machine *machine;
2001         char path[PATH_MAX];
2002
2003         if (!map->groups) {
2004                 pr_debug("Guest kernel map hasn't the point to groups\n");
2005                 return -1;
2006         }
2007         machine = map->groups->machine;
2008
2009         if (machine__is_default_guest(machine)) {
2010                 /*
2011                  * if the user specified a vmlinux filename, use it and only
2012                  * it, reporting errors to the user if it cannot be used.
2013                  * Or use file guest_kallsyms inputted by user on commandline
2014                  */
2015                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2016                         err = dso__load_vmlinux(self, map,
2017                                 symbol_conf.default_guest_vmlinux_name, filter);
2018                         goto out_try_fixup;
2019                 }
2020
2021                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2022                 if (!kallsyms_filename)
2023                         return -1;
2024         } else {
2025                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2026                 kallsyms_filename = path;
2027         }
2028
2029         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
2030         if (err > 0)
2031                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2032
2033 out_try_fixup:
2034         if (err > 0) {
2035                 if (kallsyms_filename != NULL) {
2036                         machine__mmap_name(machine, path, sizeof(path));
2037                         dso__set_long_name(self, strdup(path));
2038                 }
2039                 map__fixup_start(map);
2040                 map__fixup_end(map);
2041         }
2042
2043         return err;
2044 }
2045
2046 static void dsos__add(struct list_head *head, struct dso *dso)
2047 {
2048         list_add_tail(&dso->node, head);
2049 }
2050
2051 static struct dso *dsos__find(struct list_head *head, const char *name)
2052 {
2053         struct dso *pos;
2054
2055         list_for_each_entry(pos, head, node)
2056                 if (strcmp(pos->long_name, name) == 0)
2057                         return pos;
2058         return NULL;
2059 }
2060
2061 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2062 {
2063         struct dso *dso = dsos__find(head, name);
2064
2065         if (!dso) {
2066                 dso = dso__new(name);
2067                 if (dso != NULL) {
2068                         dsos__add(head, dso);
2069                         dso__set_basename(dso);
2070                 }
2071         }
2072
2073         return dso;
2074 }
2075
2076 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2077 {
2078         struct dso *pos;
2079         size_t ret = 0;
2080
2081         list_for_each_entry(pos, head, node) {
2082                 int i;
2083                 for (i = 0; i < MAP__NR_TYPES; ++i)
2084                         ret += dso__fprintf(pos, i, fp);
2085         }
2086
2087         return ret;
2088 }
2089
2090 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2091 {
2092         struct rb_node *nd;
2093         size_t ret = 0;
2094
2095         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2096                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2097                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2098                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2099         }
2100
2101         return ret;
2102 }
2103
2104 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2105                                       bool with_hits)
2106 {
2107         struct dso *pos;
2108         size_t ret = 0;
2109
2110         list_for_each_entry(pos, head, node) {
2111                 if (with_hits && !pos->hit)
2112                         continue;
2113                 ret += dso__fprintf_buildid(pos, fp);
2114                 ret += fprintf(fp, " %s\n", pos->long_name);
2115         }
2116         return ret;
2117 }
2118
2119 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2120 {
2121         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2122                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2123 }
2124
2125 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2126 {
2127         struct rb_node *nd;
2128         size_t ret = 0;
2129
2130         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2131                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2132                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2133         }
2134         return ret;
2135 }
2136
2137 struct dso *dso__new_kernel(const char *name)
2138 {
2139         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2140
2141         if (self != NULL) {
2142                 dso__set_short_name(self, "[kernel]");
2143                 self->kernel = DSO_TYPE_KERNEL;
2144         }
2145
2146         return self;
2147 }
2148
2149 static struct dso *dso__new_guest_kernel(struct machine *machine,
2150                                         const char *name)
2151 {
2152         char bf[PATH_MAX];
2153         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2154
2155         if (self != NULL) {
2156                 dso__set_short_name(self, "[guest.kernel]");
2157                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2158         }
2159
2160         return self;
2161 }
2162
2163 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2164 {
2165         char path[PATH_MAX];
2166
2167         if (machine__is_default_guest(machine))
2168                 return;
2169         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2170         if (sysfs__read_build_id(path, self->build_id,
2171                                  sizeof(self->build_id)) == 0)
2172                 self->has_build_id = true;
2173 }
2174
2175 static struct dso *machine__create_kernel(struct machine *self)
2176 {
2177         const char *vmlinux_name = NULL;
2178         struct dso *kernel;
2179
2180         if (machine__is_host(self)) {
2181                 vmlinux_name = symbol_conf.vmlinux_name;
2182                 kernel = dso__new_kernel(vmlinux_name);
2183         } else {
2184                 if (machine__is_default_guest(self))
2185                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2186                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2187         }
2188
2189         if (kernel != NULL) {
2190                 dso__read_running_kernel_build_id(kernel, self);
2191                 dsos__add(&self->kernel_dsos, kernel);
2192         }
2193         return kernel;
2194 }
2195
2196 struct process_args {
2197         u64 start;
2198 };
2199
2200 static int symbol__in_kernel(void *arg, const char *name,
2201                              char type __used, u64 start, u64 end __used)
2202 {
2203         struct process_args *args = arg;
2204
2205         if (strchr(name, '['))
2206                 return 0;
2207
2208         args->start = start;
2209         return 1;
2210 }
2211
2212 /* Figure out the start address of kernel map from /proc/kallsyms */
2213 static u64 machine__get_kernel_start_addr(struct machine *machine)
2214 {
2215         const char *filename;
2216         char path[PATH_MAX];
2217         struct process_args args;
2218
2219         if (machine__is_host(machine)) {
2220                 filename = "/proc/kallsyms";
2221         } else {
2222                 if (machine__is_default_guest(machine))
2223                         filename = (char *)symbol_conf.default_guest_kallsyms;
2224                 else {
2225                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2226                         filename = path;
2227                 }
2228         }
2229
2230         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2231                 return 0;
2232
2233         return args.start;
2234 }
2235
2236 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2237 {
2238         enum map_type type;
2239         u64 start = machine__get_kernel_start_addr(self);
2240
2241         for (type = 0; type < MAP__NR_TYPES; ++type) {
2242                 struct kmap *kmap;
2243
2244                 self->vmlinux_maps[type] = map__new2(start, kernel, type);
2245                 if (self->vmlinux_maps[type] == NULL)
2246                         return -1;
2247
2248                 self->vmlinux_maps[type]->map_ip =
2249                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2250
2251                 kmap = map__kmap(self->vmlinux_maps[type]);
2252                 kmap->kmaps = &self->kmaps;
2253                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2254         }
2255
2256         return 0;
2257 }
2258
2259 void machine__destroy_kernel_maps(struct machine *self)
2260 {
2261         enum map_type type;
2262
2263         for (type = 0; type < MAP__NR_TYPES; ++type) {
2264                 struct kmap *kmap;
2265
2266                 if (self->vmlinux_maps[type] == NULL)
2267                         continue;
2268
2269                 kmap = map__kmap(self->vmlinux_maps[type]);
2270                 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2271                 if (kmap->ref_reloc_sym) {
2272                         /*
2273                          * ref_reloc_sym is shared among all maps, so free just
2274                          * on one of them.
2275                          */
2276                         if (type == MAP__FUNCTION) {
2277                                 free((char *)kmap->ref_reloc_sym->name);
2278                                 kmap->ref_reloc_sym->name = NULL;
2279                                 free(kmap->ref_reloc_sym);
2280                         }
2281                         kmap->ref_reloc_sym = NULL;
2282                 }
2283
2284                 map__delete(self->vmlinux_maps[type]);
2285                 self->vmlinux_maps[type] = NULL;
2286         }
2287 }
2288
2289 int machine__create_kernel_maps(struct machine *self)
2290 {
2291         struct dso *kernel = machine__create_kernel(self);
2292
2293         if (kernel == NULL ||
2294             __machine__create_kernel_maps(self, kernel) < 0)
2295                 return -1;
2296
2297         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2298                 pr_debug("Problems creating module maps, continuing anyway...\n");
2299         /*
2300          * Now that we have all the maps created, just set the ->end of them:
2301          */
2302         map_groups__fixup_end(&self->kmaps);
2303         return 0;
2304 }
2305
2306 static void vmlinux_path__exit(void)
2307 {
2308         while (--vmlinux_path__nr_entries >= 0) {
2309                 free(vmlinux_path[vmlinux_path__nr_entries]);
2310                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2311         }
2312
2313         free(vmlinux_path);
2314         vmlinux_path = NULL;
2315 }
2316
2317 static int vmlinux_path__init(void)
2318 {
2319         struct utsname uts;
2320         char bf[PATH_MAX];
2321
2322         vmlinux_path = malloc(sizeof(char *) * 5);
2323         if (vmlinux_path == NULL)
2324                 return -1;
2325
2326         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2327         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2328                 goto out_fail;
2329         ++vmlinux_path__nr_entries;
2330         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2331         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2332                 goto out_fail;
2333         ++vmlinux_path__nr_entries;
2334
2335         /* only try running kernel version if no symfs was given */
2336         if (symbol_conf.symfs[0] != 0)
2337                 return 0;
2338
2339         if (uname(&uts) < 0)
2340                 return -1;
2341
2342         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2343         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2344         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2345                 goto out_fail;
2346         ++vmlinux_path__nr_entries;
2347         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2348         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2349         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2350                 goto out_fail;
2351         ++vmlinux_path__nr_entries;
2352         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2353                  uts.release);
2354         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2355         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2356                 goto out_fail;
2357         ++vmlinux_path__nr_entries;
2358
2359         return 0;
2360
2361 out_fail:
2362         vmlinux_path__exit();
2363         return -1;
2364 }
2365
2366 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2367 {
2368         int i;
2369         size_t printed = 0;
2370         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2371
2372         if (kdso->has_build_id) {
2373                 char filename[PATH_MAX];
2374                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2375                         printed += fprintf(fp, "[0] %s\n", filename);
2376         }
2377
2378         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2379                 printed += fprintf(fp, "[%d] %s\n",
2380                                    i + kdso->has_build_id, vmlinux_path[i]);
2381
2382         return printed;
2383 }
2384
2385 static int setup_list(struct strlist **list, const char *list_str,
2386                       const char *list_name)
2387 {
2388         if (list_str == NULL)
2389                 return 0;
2390
2391         *list = strlist__new(true, list_str);
2392         if (!*list) {
2393                 pr_err("problems parsing %s list\n", list_name);
2394                 return -1;
2395         }
2396         return 0;
2397 }
2398
2399 int symbol__init(void)
2400 {
2401         const char *symfs;
2402
2403         if (symbol_conf.initialized)
2404                 return 0;
2405
2406         elf_version(EV_CURRENT);
2407         if (symbol_conf.sort_by_name)
2408                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2409                                           sizeof(struct symbol));
2410
2411         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2412                 return -1;
2413
2414         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2415                 pr_err("'.' is the only non valid --field-separator argument\n");
2416                 return -1;
2417         }
2418
2419         if (setup_list(&symbol_conf.dso_list,
2420                        symbol_conf.dso_list_str, "dso") < 0)
2421                 return -1;
2422
2423         if (setup_list(&symbol_conf.comm_list,
2424                        symbol_conf.comm_list_str, "comm") < 0)
2425                 goto out_free_dso_list;
2426
2427         if (setup_list(&symbol_conf.sym_list,
2428                        symbol_conf.sym_list_str, "symbol") < 0)
2429                 goto out_free_comm_list;
2430
2431         /*
2432          * A path to symbols of "/" is identical to ""
2433          * reset here for simplicity.
2434          */
2435         symfs = realpath(symbol_conf.symfs, NULL);
2436         if (symfs == NULL)
2437                 symfs = symbol_conf.symfs;
2438         if (strcmp(symfs, "/") == 0)
2439                 symbol_conf.symfs = "";
2440         if (symfs != symbol_conf.symfs)
2441                 free((void *)symfs);
2442
2443         symbol_conf.initialized = true;
2444         return 0;
2445
2446 out_free_dso_list:
2447         strlist__delete(symbol_conf.dso_list);
2448 out_free_comm_list:
2449         strlist__delete(symbol_conf.comm_list);
2450         return -1;
2451 }
2452
2453 void symbol__exit(void)
2454 {
2455         if (!symbol_conf.initialized)
2456                 return;
2457         strlist__delete(symbol_conf.sym_list);
2458         strlist__delete(symbol_conf.dso_list);
2459         strlist__delete(symbol_conf.comm_list);
2460         vmlinux_path__exit();
2461         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2462         symbol_conf.initialized = false;
2463 }
2464
2465 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2466 {
2467         struct machine *machine = machines__findnew(self, pid);
2468
2469         if (machine == NULL)
2470                 return -1;
2471
2472         return machine__create_kernel_maps(machine);
2473 }
2474
2475 static int hex(char ch)
2476 {
2477         if ((ch >= '0') && (ch <= '9'))
2478                 return ch - '0';
2479         if ((ch >= 'a') && (ch <= 'f'))
2480                 return ch - 'a' + 10;
2481         if ((ch >= 'A') && (ch <= 'F'))
2482                 return ch - 'A' + 10;
2483         return -1;
2484 }
2485
2486 /*
2487  * While we find nice hex chars, build a long_val.
2488  * Return number of chars processed.
2489  */
2490 int hex2u64(const char *ptr, u64 *long_val)
2491 {
2492         const char *p = ptr;
2493         *long_val = 0;
2494
2495         while (*p) {
2496                 const int hex_val = hex(*p);
2497
2498                 if (hex_val < 0)
2499                         break;
2500
2501                 *long_val = (*long_val << 4) | hex_val;
2502                 p++;
2503         }
2504
2505         return p - ptr;
2506 }
2507
2508 char *strxfrchar(char *s, char from, char to)
2509 {
2510         char *p = s;
2511
2512         while ((p = strchr(p, from)) != NULL)
2513                 *p++ = to;
2514
2515         return s;
2516 }
2517
2518 int machines__create_guest_kernel_maps(struct rb_root *self)
2519 {
2520         int ret = 0;
2521         struct dirent **namelist = NULL;
2522         int i, items = 0;
2523         char path[PATH_MAX];
2524         pid_t pid;
2525
2526         if (symbol_conf.default_guest_vmlinux_name ||
2527             symbol_conf.default_guest_modules ||
2528             symbol_conf.default_guest_kallsyms) {
2529                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2530         }
2531
2532         if (symbol_conf.guestmount) {
2533                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2534                 if (items <= 0)
2535                         return -ENOENT;
2536                 for (i = 0; i < items; i++) {
2537                         if (!isdigit(namelist[i]->d_name[0])) {
2538                                 /* Filter out . and .. */
2539                                 continue;
2540                         }
2541                         pid = atoi(namelist[i]->d_name);
2542                         sprintf(path, "%s/%s/proc/kallsyms",
2543                                 symbol_conf.guestmount,
2544                                 namelist[i]->d_name);
2545                         ret = access(path, R_OK);
2546                         if (ret) {
2547                                 pr_debug("Can't access file %s\n", path);
2548                                 goto failure;
2549                         }
2550                         machines__create_kernel_maps(self, pid);
2551                 }
2552 failure:
2553                 free(namelist);
2554         }
2555
2556         return ret;
2557 }
2558
2559 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2560 {
2561         struct rb_node *next = rb_first(self);
2562
2563         while (next) {
2564                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2565
2566                 next = rb_next(&pos->rb_node);
2567                 rb_erase(&pos->rb_node, self);
2568                 machine__delete(pos);
2569         }
2570 }
2571
2572 int machine__load_kallsyms(struct machine *self, const char *filename,
2573                            enum map_type type, symbol_filter_t filter)
2574 {
2575         struct map *map = self->vmlinux_maps[type];
2576         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2577
2578         if (ret > 0) {
2579                 dso__set_loaded(map->dso, type);
2580                 /*
2581                  * Since /proc/kallsyms will have multiple sessions for the
2582                  * kernel, with modules between them, fixup the end of all
2583                  * sections.
2584                  */
2585                 __map_groups__fixup_end(&self->kmaps, type);
2586         }
2587
2588         return ret;
2589 }
2590
2591 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2592                                symbol_filter_t filter)
2593 {
2594         struct map *map = self->vmlinux_maps[type];
2595         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2596
2597         if (ret > 0) {
2598                 dso__set_loaded(map->dso, type);
2599                 map__reloc_vmlinux(map);
2600         }
2601
2602         return ret;
2603 }