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->symtab_type = SYMTAB__NOT_FOUND;
 211                 self->loaded = 0;
 212                 self->sorted_by_name = 0;
 213                 self->has_build_id = 0;
 214                 self->kernel = DSO_TYPE_USER;
 215                 INIT_LIST_HEAD(&self->node);
 216         }
 217
 218         return self;
 219 }
 220
 221 static void symbols__delete(struct rb_root *self)
 222 {
 223         struct symbol *pos;
 224         struct rb_node *next = rb_first(self);
 225
 226         while (next) {
 227                 pos = rb_entry(next, struct symbol, rb_node);
 228                 next = rb_next(&pos->rb_node);
 229                 rb_erase(&pos->rb_node, self);
 230                 symbol__delete(pos);
 231         }
 232 }
 233
 234 void dso__delete(struct dso *self)
 235 {
 236         int i;
 237         for (i = 0; i < MAP__NR_TYPES; ++i)
 238                 symbols__delete(&self->symbols[i]);
 239         if (self->sname_alloc)
 240                 free((char *)self->short_name);
 241         if (self->lname_alloc)
 242                 free(self->long_name);
 243         free(self);
 244 }
 245
 246 void dso__set_build_id(struct dso *self, void *build_id)
 247 {
 248         memcpy(self->build_id, build_id, sizeof(self->build_id));
 249         self->has_build_id = 1;
 250 }
 251
 252 static void symbols__insert(struct rb_root *self, struct symbol *sym)
 253 {
 254         struct rb_node **p = &self->rb_node;
 255         struct rb_node *parent = NULL;
 256         const u64 ip = sym->start;
 257         struct symbol *s;
 258
 259         while (*p != NULL) {
 260                 parent = *p;
 261                 s = rb_entry(parent, struct symbol, rb_node);
 262                 if (ip < s->start)
 263                         p = &(*p)->rb_left;
 264                 else
 265                         p = &(*p)->rb_right;
 266         }
 267         rb_link_node(&sym->rb_node, parent, p);
 268         rb_insert_color(&sym->rb_node, self);
 269 }
 270
 271 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
 272 {
 273         struct rb_node *n;
 274
 275         if (self == NULL)
 276                 return NULL;
 277
 278         n = self->rb_node;
 279
 280         while (n) {
 281                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 282
 283                 if (ip < s->start)
 284                         n = n->rb_left;
 285                 else if (ip > s->end)
 286                         n = n->rb_right;
 287                 else
 288                         return s;
 289         }
 290
 291         return NULL;
 292 }
 293
 294 struct symbol_name_rb_node {
 295         struct rb_node  rb_node;
 296         struct symbol   sym;
 297 };
 298
 299 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
 300 {
 301         struct rb_node **p = &self->rb_node;
 302         struct rb_node *parent = NULL;
 303         struct symbol_name_rb_node *symn, *s;
 304
 305         symn = container_of(sym, struct symbol_name_rb_node, sym);
 306
 307         while (*p != NULL) {
 308                 parent = *p;
 309                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 310                 if (strcmp(sym->name, s->sym.name) < 0)
 311                         p = &(*p)->rb_left;
 312                 else
 313                         p = &(*p)->rb_right;
 314         }
 315         rb_link_node(&symn->rb_node, parent, p);
 316         rb_insert_color(&symn->rb_node, self);
 317 }
 318
 319 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
 320 {
 321         struct rb_node *nd;
 322
 323         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 324                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 325                 symbols__insert_by_name(self, pos);
 326         }
 327 }
 328
 329 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
 330 {
 331         struct rb_node *n;
 332
 333         if (self == NULL)
 334                 return NULL;
 335
 336         n = self->rb_node;
 337
 338         while (n) {
 339                 struct symbol_name_rb_node *s;
 340                 int cmp;
 341
 342                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 343                 cmp = strcmp(name, s->sym.name);
 344
 345                 if (cmp < 0)
 346                         n = n->rb_left;
 347                 else if (cmp > 0)
 348                         n = n->rb_right;
 349                 else
 350                         return &s->sym;
 351         }
 352
 353         return NULL;
 354 }
 355
 356 struct symbol *dso__find_symbol(struct dso *self,
 357                                 enum map_type type, u64 addr)
 358 {
 359         return symbols__find(&self->symbols[type], addr);
 360 }
 361
 362 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 363                                         const char *name)
 364 {
 365         return symbols__find_by_name(&self->symbol_names[type], name);
 366 }
 367
 368 void dso__sort_by_name(struct dso *self, enum map_type type)
 369 {
 370         dso__set_sorted_by_name(self, type);
 371         return symbols__sort_by_name(&self->symbol_names[type],
 372                                      &self->symbols[type]);
 373 }
 374
 375 int build_id__sprintf(const u8 *self, int len, char *bf)
 376 {
 377         char *bid = bf;
 378         const u8 *raw = self;
 379         int i;
 380
 381         for (i = 0; i < len; ++i) {
 382                 sprintf(bid, "%02x", *raw);
 383                 ++raw;
 384                 bid += 2;
 385         }
 386
 387         return raw - self;
 388 }
 389
 390 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 391 {
 392         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 393
 394         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 395         return fprintf(fp, "%s", sbuild_id);
 396 }
 397
 398 size_t dso__fprintf_symbols_by_name(struct dso *self, enum map_type type, FILE *fp)
 399 {
 400         size_t ret = 0;
 401         struct rb_node *nd;
 402         struct symbol_name_rb_node *pos;
 403
 404         for (nd = rb_first(&self->symbol_names[type]); nd; nd = rb_next(nd)) {
 405                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 406                 fprintf(fp, "%s\n", pos->sym.name);
 407         }
 408
 409         return ret;
 410 }
 411
 412 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
 413 {
 414         struct rb_node *nd;
 415         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 416
 417         if (self->short_name != self->long_name)
 418                 ret += fprintf(fp, "%s, ", self->long_name);
 419         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
 420                        self->loaded ? "" : "NOT ");
 421         ret += dso__fprintf_buildid(self, fp);
 422         ret += fprintf(fp, ")\n");
 423         for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
 424                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 425                 ret += symbol__fprintf(pos, fp);
 426         }
 427
 428         return ret;
 429 }
 430
 431 int kallsyms__parse(const char *filename, void *arg,
 432                     int (*process_symbol)(void *arg, const char *name,
 433                                           char type, u64 start, u64 end))
 434 {
 435         char *line = NULL;
 436         size_t n;
 437         int err = -1;
 438         u64 prev_start = 0;
 439         char prev_symbol_type = 0;
 440         char *prev_symbol_name;
 441         FILE *file = fopen(filename, "r");
 442
 443         if (file == NULL)
 444                 goto out_failure;
 445
 446         prev_symbol_name = malloc(KSYM_NAME_LEN);
 447         if (prev_symbol_name == NULL)
 448                 goto out_close;
 449
 450         err = 0;
 451
 452         while (!feof(file)) {
 453                 u64 start;
 454                 int line_len, len;
 455                 char symbol_type;
 456                 char *symbol_name;
 457
 458                 line_len = getline(&line, &n, file);
 459                 if (line_len < 0 || !line)
 460                         break;
 461
 462                 line[--line_len] = '\0'; /* \n */
 463
 464                 len = hex2u64(line, &start);
 465
 466                 len++;
 467                 if (len + 2 >= line_len)
 468                         continue;
 469
 470                 symbol_type = toupper(line[len]);
 471                 len += 2;
 472                 symbol_name = line + len;
 473                 len = line_len - len;
 474
 475                 if (len >= KSYM_NAME_LEN) {
 476                         err = -1;
 477                         break;
 478                 }
 479
 480                 if (prev_symbol_type) {
 481                         u64 end = start;
 482                         if (end != prev_start)
 483                                 --end;
 484                         err = process_symbol(arg, prev_symbol_name,
 485                                              prev_symbol_type, prev_start, end);
 486                         if (err)
 487                                 break;
 488                 }
 489
 490                 memcpy(prev_symbol_name, symbol_name, len + 1);
 491                 prev_symbol_type = symbol_type;
 492                 prev_start = start;
 493         }
 494
 495         free(prev_symbol_name);
 496         free(line);
 497 out_close:
 498         fclose(file);
 499         return err;
 500
 501 out_failure:
 502         return -1;
 503 }
 504
 505 struct process_kallsyms_args {
 506         struct map *map;
 507         struct dso *dso;
 508 };
 509
 510 static u8 kallsyms2elf_type(char type)
 511 {
 512         if (type == 'W')
 513                 return STB_WEAK;
 514
 515         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
 516 }
 517
 518 static int map__process_kallsym_symbol(void *arg, const char *name,
 519                                        char type, u64 start, u64 end)
 520 {
 521         struct symbol *sym;
 522         struct process_kallsyms_args *a = arg;
 523         struct rb_root *root = &a->dso->symbols[a->map->type];
 524
 525         if (!symbol_type__is_a(type, a->map->type))
 526                 return 0;
 527
 528         sym = symbol__new(start, end - start + 1,
 529                           kallsyms2elf_type(type), name);
 530         if (sym == NULL)
 531                 return -ENOMEM;
 532         /*
 533          * We will pass the symbols to the filter later, in
 534          * map__split_kallsyms, when we have split the maps per module
 535          */
 536         symbols__insert(root, sym);
 537
 538         return 0;
 539 }
 540
 541 /*
 542  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 543  * so that we can in the next step set the symbol ->end address and then
 544  * call kernel_maps__split_kallsyms.
 545  */
 546 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
 547                                   struct map *map)
 548 {
 549         struct process_kallsyms_args args = { .map = map, .dso = self, };
 550         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 551 }
 552
 553 /*
 554  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 555  * kernel range is broken in several maps, named [kernel].N, as we don't have
 556  * the original ELF section names vmlinux have.
 557  */
 558 static int dso__split_kallsyms(struct dso *self, struct map *map,
 559                                symbol_filter_t filter)
 560 {
 561         struct map_groups *kmaps = map__kmap(map)->kmaps;
 562         struct machine *machine = kmaps->machine;
 563         struct map *curr_map = map;
 564         struct symbol *pos;
 565         int count = 0, moved = 0;
 566         struct rb_root *root = &self->symbols[map->type];
 567         struct rb_node *next = rb_first(root);
 568         int kernel_range = 0;
 569
 570         while (next) {
 571                 char *module;
 572
 573                 pos = rb_entry(next, struct symbol, rb_node);
 574                 next = rb_next(&pos->rb_node);
 575
 576                 module = strchr(pos->name, '\t');
 577                 if (module) {
 578                         if (!symbol_conf.use_modules)
 579                                 goto discard_symbol;
 580
 581                         *module++ = '\0';
 582
 583                         if (strcmp(curr_map->dso->short_name, module)) {
 584                                 if (curr_map != map &&
 585                                     self->kernel == DSO_TYPE_GUEST_KERNEL &&
 586                                     machine__is_default_guest(machine)) {
 587                                         /*
 588                                          * We assume all symbols of a module are
 589                                          * continuous in * kallsyms, so curr_map
 590                                          * points to a module and all its
 591                                          * symbols are in its kmap. Mark it as
 592                                          * loaded.
 593                                          */
 594                                         dso__set_loaded(curr_map->dso,
 595                                                         curr_map->type);
 596                                 }
 597
 598                                 curr_map = map_groups__find_by_name(kmaps,
 599                                                         map->type, module);
 600                                 if (curr_map == NULL) {
 601                                         pr_debug("%s/proc/{kallsyms,modules} "
 602                                                  "inconsistency while looking "
 603                                                  "for \"%s\" module!\n",
 604                                                  machine->root_dir, module);
 605                                         curr_map = map;
 606                                         goto discard_symbol;
 607                                 }
 608
 609                                 if (curr_map->dso->loaded &&
 610                                     !machine__is_default_guest(machine))
 611                                         goto discard_symbol;
 612                         }
 613                         /*
 614                          * So that we look just like we get from .ko files,
 615                          * i.e. not prelinked, relative to map->start.
 616                          */
 617                         pos->start = curr_map->map_ip(curr_map, pos->start);
 618                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 619                 } else if (curr_map != map) {
 620                         char dso_name[PATH_MAX];
 621                         struct dso *dso;
 622
 623                         if (count == 0) {
 624                                 curr_map = map;
 625                                 goto filter_symbol;
 626                         }
 627
 628                         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 629                                 snprintf(dso_name, sizeof(dso_name),
 630                                         "[guest.kernel].%d",
 631                                         kernel_range++);
 632                         else
 633                                 snprintf(dso_name, sizeof(dso_name),
 634                                         "[kernel].%d",
 635                                         kernel_range++);
 636
 637                         dso = dso__new(dso_name);
 638                         if (dso == NULL)
 639                                 return -1;
 640
 641                         dso->kernel = self->kernel;
 642
 643                         curr_map = map__new2(pos->start, dso, map->type);
 644                         if (curr_map == NULL) {
 645                                 dso__delete(dso);
 646                                 return -1;
 647                         }
 648
 649                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 650                         map_groups__insert(kmaps, curr_map);
 651                         ++kernel_range;
 652                 }
 653 filter_symbol:
 654                 if (filter && filter(curr_map, pos)) {
 655 discard_symbol:         rb_erase(&pos->rb_node, root);
 656                         symbol__delete(pos);
 657                 } else {
 658                         if (curr_map != map) {
 659                                 rb_erase(&pos->rb_node, root);
 660                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 661                                 ++moved;
 662                         } else
 663                                 ++count;
 664                 }
 665         }
 666
 667         if (curr_map != map &&
 668             self->kernel == DSO_TYPE_GUEST_KERNEL &&
 669             machine__is_default_guest(kmaps->machine)) {
 670                 dso__set_loaded(curr_map->dso, curr_map->type);
 671         }
 672
 673         return count + moved;
 674 }
 675
 676 int dso__load_kallsyms(struct dso *self, const char *filename,
 677                        struct map *map, symbol_filter_t filter)
 678 {
 679         if (dso__load_all_kallsyms(self, filename, map) < 0)
 680                 return -1;
 681
 682         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 683                 self->symtab_type = SYMTAB__GUEST_KALLSYMS;
 684         else
 685                 self->symtab_type = SYMTAB__KALLSYMS;
 686
 687         return dso__split_kallsyms(self, map, filter);
 688 }
 689
 690 static int dso__load_perf_map(struct dso *self, struct map *map,
 691                               symbol_filter_t filter)
 692 {
 693         char *line = NULL;
 694         size_t n;
 695         FILE *file;
 696         int nr_syms = 0;
 697
 698         file = fopen(self->long_name, "r");
 699         if (file == NULL)
 700                 goto out_failure;
 701
 702         while (!feof(file)) {
 703                 u64 start, size;
 704                 struct symbol *sym;
 705                 int line_len, len;
 706
 707                 line_len = getline(&line, &n, file);
 708                 if (line_len < 0)
 709                         break;
 710
 711                 if (!line)
 712                         goto out_failure;
 713
 714                 line[--line_len] = '\0'; /* \n */
 715
 716                 len = hex2u64(line, &start);
 717
 718                 len++;
 719                 if (len + 2 >= line_len)
 720                         continue;
 721
 722                 len += hex2u64(line + len, &size);
 723
 724                 len++;
 725                 if (len + 2 >= line_len)
 726                         continue;
 727
 728                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
 729
 730                 if (sym == NULL)
 731                         goto out_delete_line;
 732
 733                 if (filter && filter(map, sym))
 734                         symbol__delete(sym);
 735                 else {
 736                         symbols__insert(&self->symbols[map->type], sym);
 737                         nr_syms++;
 738                 }
 739         }
 740
 741         free(line);
 742         fclose(file);
 743
 744         return nr_syms;
 745
 746 out_delete_line:
 747         free(line);
 748 out_failure:
 749         return -1;
 750 }
 751
 752 /**
 753  * elf_symtab__for_each_symbol - iterate thru all the symbols
 754  *
 755  * @self: struct elf_symtab instance to iterate
 756  * @idx: uint32_t idx
 757  * @sym: GElf_Sym iterator
 758  */
 759 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 760         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 761              idx < nr_syms; \
 762              idx++, gelf_getsym(syms, idx, &sym))
 763
 764 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 765 {
 766         return GELF_ST_TYPE(sym->st_info);
 767 }
 768
 769 static inline int elf_sym__is_function(const GElf_Sym *sym)
 770 {
 771         return elf_sym__type(sym) == STT_FUNC &&
 772                sym->st_name != 0 &&
 773                sym->st_shndx != SHN_UNDEF;
 774 }
 775
 776 static inline bool elf_sym__is_object(const GElf_Sym *sym)
 777 {
 778         return elf_sym__type(sym) == STT_OBJECT &&
 779                 sym->st_name != 0 &&
 780                 sym->st_shndx != SHN_UNDEF;
 781 }
 782
 783 static inline int elf_sym__is_label(const GElf_Sym *sym)
 784 {
 785         return elf_sym__type(sym) == STT_NOTYPE &&
 786                 sym->st_name != 0 &&
 787                 sym->st_shndx != SHN_UNDEF &&
 788                 sym->st_shndx != SHN_ABS;
 789 }
 790
 791 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 792                                         const Elf_Data *secstrs)
 793 {
 794         return secstrs->d_buf + shdr->sh_name;
 795 }
 796
 797 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 798                                         const Elf_Data *secstrs)
 799 {
 800         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 801 }
 802
 803 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
 804                                     const Elf_Data *secstrs)
 805 {
 806         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
 807 }
 808
 809 static inline const char *elf_sym__name(const GElf_Sym *sym,
 810                                         const Elf_Data *symstrs)
 811 {
 812         return symstrs->d_buf + sym->st_name;
 813 }
 814
 815 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 816                                     GElf_Shdr *shp, const char *name,
 817                                     size_t *idx)
 818 {
 819         Elf_Scn *sec = NULL;
 820         size_t cnt = 1;
 821
 822         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 823                 char *str;
 824
 825                 gelf_getshdr(sec, shp);
 826                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 827                 if (!strcmp(name, str)) {
 828                         if (idx)
 829                                 *idx = cnt;
 830                         break;
 831                 }
 832                 ++cnt;
 833         }
 834
 835         return sec;
 836 }
 837
 838 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 839         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 840              idx < nr_entries; \
 841              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 842
 843 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 844         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 845              idx < nr_entries; \
 846              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 847
 848 /*
 849  * We need to check if we have a .dynsym, so that we can handle the
 850  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 851  * .dynsym or .symtab).
 852  * And always look at the original dso, not at debuginfo packages, that
 853  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 854  */
 855 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 856                                        symbol_filter_t filter)
 857 {
 858         uint32_t nr_rel_entries, idx;
 859         GElf_Sym sym;
 860         u64 plt_offset;
 861         GElf_Shdr shdr_plt;
 862         struct symbol *f;
 863         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 864         Elf_Data *reldata, *syms, *symstrs;
 865         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 866         size_t dynsym_idx;
 867         GElf_Ehdr ehdr;
 868         char sympltname[1024];
 869         Elf *elf;
 870         int nr = 0, symidx, fd, err = 0;
 871         char name[PATH_MAX];
 872
 873         snprintf(name, sizeof(name), "%s%s",
 874                  symbol_conf.symfs, self->long_name);
 875         fd = open(name, O_RDONLY);
 876         if (fd < 0)
 877                 goto out;
 878
 879         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 880         if (elf == NULL)
 881                 goto out_close;
 882
 883         if (gelf_getehdr(elf, &ehdr) == NULL)
 884                 goto out_elf_end;
 885
 886         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 887                                          ".dynsym", &dynsym_idx);
 888         if (scn_dynsym == NULL)
 889                 goto out_elf_end;
 890
 891         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 892                                           ".rela.plt", NULL);
 893         if (scn_plt_rel == NULL) {
 894                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 895                                                   ".rel.plt", NULL);
 896                 if (scn_plt_rel == NULL)
 897                         goto out_elf_end;
 898         }
 899
 900         err = -1;
 901
 902         if (shdr_rel_plt.sh_link != dynsym_idx)
 903                 goto out_elf_end;
 904
 905         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 906                 goto out_elf_end;
 907
 908         /*
 909          * Fetch the relocation section to find the idxes to the GOT
 910          * and the symbols in the .dynsym they refer to.
 911          */
 912         reldata = elf_getdata(scn_plt_rel, NULL);
 913         if (reldata == NULL)
 914                 goto out_elf_end;
 915
 916         syms = elf_getdata(scn_dynsym, NULL);
 917         if (syms == NULL)
 918                 goto out_elf_end;
 919
 920         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 921         if (scn_symstrs == NULL)
 922                 goto out_elf_end;
 923
 924         symstrs = elf_getdata(scn_symstrs, NULL);
 925         if (symstrs == NULL)
 926                 goto out_elf_end;
 927
 928         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 929         plt_offset = shdr_plt.sh_offset;
 930
 931         if (shdr_rel_plt.sh_type == SHT_RELA) {
 932                 GElf_Rela pos_mem, *pos;
 933
 934                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 935                                            nr_rel_entries) {
 936                         symidx = GELF_R_SYM(pos->r_info);
 937                         plt_offset += shdr_plt.sh_entsize;
 938                         gelf_getsym(syms, symidx, &sym);
 939                         snprintf(sympltname, sizeof(sympltname),
 940                                  "%s@plt", elf_sym__name(&sym, symstrs));
 941
 942                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 943                                         STB_GLOBAL, sympltname);
 944                         if (!f)
 945                                 goto out_elf_end;
 946
 947                         if (filter && filter(map, f))
 948                                 symbol__delete(f);
 949                         else {
 950                                 symbols__insert(&self->symbols[map->type], f);
 951                                 ++nr;
 952                         }
 953                 }
 954         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 955                 GElf_Rel pos_mem, *pos;
 956                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 957                                           nr_rel_entries) {
 958                         symidx = GELF_R_SYM(pos->r_info);
 959                         plt_offset += shdr_plt.sh_entsize;
 960                         gelf_getsym(syms, symidx, &sym);
 961                         snprintf(sympltname, sizeof(sympltname),
 962                                  "%s@plt", elf_sym__name(&sym, symstrs));
 963
 964                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 965                                         STB_GLOBAL, sympltname);
 966                         if (!f)
 967                                 goto out_elf_end;
 968
 969                         if (filter && filter(map, f))
 970                                 symbol__delete(f);
 971                         else {
 972                                 symbols__insert(&self->symbols[map->type], f);
 973                                 ++nr;
 974                         }
 975                 }
 976         }
 977
 978         err = 0;
 979 out_elf_end:
 980         elf_end(elf);
 981 out_close:
 982         close(fd);
 983
 984         if (err == 0)
 985                 return nr;
 986 out:
 987         pr_debug("%s: problems reading %s PLT info.\n",
 988                  __func__, self->long_name);
 989         return 0;
 990 }
 991
 992 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
 993 {
 994         switch (type) {
 995         case MAP__FUNCTION:
 996                 return elf_sym__is_function(self);
 997         case MAP__VARIABLE:
 998                 return elf_sym__is_object(self);
 999         default:
1000                 return false;
1001         }
1002 }
1003
1004 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
1005 {
1006         switch (type) {
1007         case MAP__FUNCTION:
1008                 return elf_sec__is_text(self, secstrs);
1009         case MAP__VARIABLE:
1010                 return elf_sec__is_data(self, secstrs);
1011         default:
1012                 return false;
1013         }
1014 }
1015
1016 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1017 {
1018         Elf_Scn *sec = NULL;
1019         GElf_Shdr shdr;
1020         size_t cnt = 1;
1021
1022         while ((sec = elf_nextscn(elf, sec)) != NULL) {
1023                 gelf_getshdr(sec, &shdr);
1024
1025                 if ((addr >= shdr.sh_addr) &&
1026                     (addr < (shdr.sh_addr + shdr.sh_size)))
1027                         return cnt;
1028
1029                 ++cnt;
1030         }
1031
1032         return -1;
1033 }
1034
1035 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
1036                          int fd, symbol_filter_t filter, int kmodule,
1037                          int want_symtab)
1038 {
1039         struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
1040         struct map *curr_map = map;
1041         struct dso *curr_dso = self;
1042         Elf_Data *symstrs, *secstrs;
1043         uint32_t nr_syms;
1044         int err = -1;
1045         uint32_t idx;
1046         GElf_Ehdr ehdr;
1047         GElf_Shdr shdr, opdshdr;
1048         Elf_Data *syms, *opddata = NULL;
1049         GElf_Sym sym;
1050         Elf_Scn *sec, *sec_strndx, *opdsec;
1051         Elf *elf;
1052         int nr = 0;
1053         size_t opdidx = 0;
1054
1055         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1056         if (elf == NULL) {
1057                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1058                 goto out_close;
1059         }
1060
1061         if (gelf_getehdr(elf, &ehdr) == NULL) {
1062                 pr_debug("%s: cannot get elf header.\n", __func__);
1063                 goto out_elf_end;
1064         }
1065
1066         /* Always reject images with a mismatched build-id: */
1067         if (self->has_build_id) {
1068                 u8 build_id[BUILD_ID_SIZE];
1069
1070                 if (elf_read_build_id(elf, build_id,
1071                                       BUILD_ID_SIZE) != BUILD_ID_SIZE)
1072                         goto out_elf_end;
1073
1074                 if (!dso__build_id_equal(self, build_id))
1075                         goto out_elf_end;
1076         }
1077
1078         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1079         if (sec == NULL) {
1080                 if (want_symtab)
1081                         goto out_elf_end;
1082
1083                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1084                 if (sec == NULL)
1085                         goto out_elf_end;
1086         }
1087
1088         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1089         if (opdsec)
1090                 opddata = elf_rawdata(opdsec, NULL);
1091
1092         syms = elf_getdata(sec, NULL);
1093         if (syms == NULL)
1094                 goto out_elf_end;
1095
1096         sec = elf_getscn(elf, shdr.sh_link);
1097         if (sec == NULL)
1098                 goto out_elf_end;
1099
1100         symstrs = elf_getdata(sec, NULL);
1101         if (symstrs == NULL)
1102                 goto out_elf_end;
1103
1104         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1105         if (sec_strndx == NULL)
1106                 goto out_elf_end;
1107
1108         secstrs = elf_getdata(sec_strndx, NULL);
1109         if (secstrs == NULL)
1110                 goto out_elf_end;
1111
1112         nr_syms = shdr.sh_size / shdr.sh_entsize;
1113
1114         memset(&sym, 0, sizeof(sym));
1115         if (self->kernel == DSO_TYPE_USER) {
1116                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1117                                 elf_section_by_name(elf, &ehdr, &shdr,
1118                                                      ".gnu.prelink_undo",
1119                                                      NULL) != NULL);
1120         } else self->adjust_symbols = 0;
1121
1122         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1123                 struct symbol *f;
1124                 const char *elf_name = elf_sym__name(&sym, symstrs);
1125                 char *demangled = NULL;
1126                 int is_label = elf_sym__is_label(&sym);
1127                 const char *section_name;
1128
1129                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1130                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1131                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1132
1133                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1134                         continue;
1135
1136                 /* Reject ARM ELF "mapping symbols": these aren't unique and
1137                  * don't identify functions, so will confuse the profile
1138                  * output: */
1139                 if (ehdr.e_machine == EM_ARM) {
1140                         if (!strcmp(elf_name, "$a") ||
1141                             !strcmp(elf_name, "$d") ||
1142                             !strcmp(elf_name, "$t"))
1143                                 continue;
1144                 }
1145
1146                 if (opdsec && sym.st_shndx == opdidx) {
1147                         u32 offset = sym.st_value - opdshdr.sh_addr;
1148                         u64 *opd = opddata->d_buf + offset;
1149                         sym.st_value = *opd;
1150                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1151                 }
1152
1153                 sec = elf_getscn(elf, sym.st_shndx);
1154                 if (!sec)
1155                         goto out_elf_end;
1156
1157                 gelf_getshdr(sec, &shdr);
1158
1159                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1160                         continue;
1161
1162                 section_name = elf_sec__name(&shdr, secstrs);
1163
1164                 /* On ARM, symbols for thumb functions have 1 added to
1165                  * the symbol address as a flag - remove it */
1166                 if ((ehdr.e_machine == EM_ARM) &&
1167                     (map->type == MAP__FUNCTION) &&
1168                     (sym.st_value & 1))
1169                         --sym.st_value;
1170
1171                 if (self->kernel != DSO_TYPE_USER || kmodule) {
1172                         char dso_name[PATH_MAX];
1173
1174                         if (strcmp(section_name,
1175                                    (curr_dso->short_name +
1176                                     self->short_name_len)) == 0)
1177                                 goto new_symbol;
1178
1179                         if (strcmp(section_name, ".text") == 0) {
1180                                 curr_map = map;
1181                                 curr_dso = self;
1182                                 goto new_symbol;
1183                         }
1184
1185                         snprintf(dso_name, sizeof(dso_name),
1186                                  "%s%s", self->short_name, section_name);
1187
1188                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1189                         if (curr_map == NULL) {
1190                                 u64 start = sym.st_value;
1191
1192                                 if (kmodule)
1193                                         start += map->start + shdr.sh_offset;
1194
1195                                 curr_dso = dso__new(dso_name);
1196                                 if (curr_dso == NULL)
1197                                         goto out_elf_end;
1198                                 curr_dso->kernel = self->kernel;
1199                                 curr_dso->long_name = self->long_name;
1200                                 curr_dso->long_name_len = self->long_name_len;
1201                                 curr_map = map__new2(start, curr_dso,
1202                                                      map->type);
1203                                 if (curr_map == NULL) {
1204                                         dso__delete(curr_dso);
1205                                         goto out_elf_end;
1206                                 }
1207                                 curr_map->map_ip = identity__map_ip;
1208                                 curr_map->unmap_ip = identity__map_ip;
1209                                 curr_dso->symtab_type = self->symtab_type;
1210                                 map_groups__insert(kmap->kmaps, curr_map);
1211                                 dsos__add(&self->node, curr_dso);
1212                                 dso__set_loaded(curr_dso, map->type);
1213                         } else
1214                                 curr_dso = curr_map->dso;
1215
1216                         goto new_symbol;
1217                 }
1218
1219                 if (curr_dso->adjust_symbols) {
1220                         pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1221                                   "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1222                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1223                                   (u64)shdr.sh_offset);
1224                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1225                 }
1226                 /*
1227                  * We need to figure out if the object was created from C++ sources
1228                  * DWARF DW_compile_unit has this, but we don't always have access
1229                  * to it...
1230                  */
1231                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1232                 if (demangled != NULL)
1233                         elf_name = demangled;
1234 new_symbol:
1235                 f = symbol__new(sym.st_value, sym.st_size,
1236                                 GELF_ST_BIND(sym.st_info), elf_name);
1237                 free(demangled);
1238                 if (!f)
1239                         goto out_elf_end;
1240
1241                 if (filter && filter(curr_map, f))
1242                         symbol__delete(f);
1243                 else {
1244                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1245                         nr++;
1246                 }
1247         }
1248
1249         /*
1250          * For misannotated, zeroed, ASM function sizes.
1251          */
1252         if (nr > 0) {
1253                 symbols__fixup_end(&self->symbols[map->type]);
1254                 if (kmap) {
1255                         /*
1256                          * We need to fixup this here too because we create new
1257                          * maps here, for things like vsyscall sections.
1258                          */
1259                         __map_groups__fixup_end(kmap->kmaps, map->type);
1260                 }
1261         }
1262         err = nr;
1263 out_elf_end:
1264         elf_end(elf);
1265 out_close:
1266         return err;
1267 }
1268
1269 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1270 {
1271         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1272 }
1273
1274 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1275 {
1276         bool have_build_id = false;
1277         struct dso *pos;
1278
1279         list_for_each_entry(pos, head, node) {
1280                 if (with_hits && !pos->hit)
1281                         continue;
1282                 if (pos->has_build_id) {
1283                         have_build_id = true;
1284                         continue;
1285                 }
1286                 if (filename__read_build_id(pos->long_name, pos->build_id,
1287                                             sizeof(pos->build_id)) > 0) {
1288                         have_build_id     = true;
1289                         pos->has_build_id = true;
1290                 }
1291         }
1292
1293         return have_build_id;
1294 }
1295
1296 /*
1297  * Align offset to 4 bytes as needed for note name and descriptor data.
1298  */
1299 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1300
1301 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1302 {
1303         int err = -1;
1304         GElf_Ehdr ehdr;
1305         GElf_Shdr shdr;
1306         Elf_Data *data;
1307         Elf_Scn *sec;
1308         Elf_Kind ek;
1309         void *ptr;
1310
1311         if (size < BUILD_ID_SIZE)
1312                 goto out;
1313
1314         ek = elf_kind(elf);
1315         if (ek != ELF_K_ELF)
1316                 goto out;
1317
1318         if (gelf_getehdr(elf, &ehdr) == NULL) {
1319                 pr_err("%s: cannot get elf header.\n", __func__);
1320                 goto out;
1321         }
1322
1323         sec = elf_section_by_name(elf, &ehdr, &shdr,
1324                                   ".note.gnu.build-id", NULL);
1325         if (sec == NULL) {
1326                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1327                                           ".notes", NULL);
1328                 if (sec == NULL)
1329                         goto out;
1330         }
1331
1332         data = elf_getdata(sec, NULL);
1333         if (data == NULL)
1334                 goto out;
1335
1336         ptr = data->d_buf;
1337         while (ptr < (data->d_buf + data->d_size)) {
1338                 GElf_Nhdr *nhdr = ptr;
1339                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1340                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1341                 const char *name;
1342
1343                 ptr += sizeof(*nhdr);
1344                 name = ptr;
1345                 ptr += namesz;
1346                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1347                     nhdr->n_namesz == sizeof("GNU")) {
1348                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1349                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1350                                 err = BUILD_ID_SIZE;
1351                                 break;
1352                         }
1353                 }
1354                 ptr += descsz;
1355         }
1356
1357 out:
1358         return err;
1359 }
1360
1361 int filename__read_build_id(const char *filename, void *bf, size_t size)
1362 {
1363         int fd, err = -1;
1364         Elf *elf;
1365
1366         if (size < BUILD_ID_SIZE)
1367                 goto out;
1368
1369         fd = open(filename, O_RDONLY);
1370         if (fd < 0)
1371                 goto out;
1372
1373         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1374         if (elf == NULL) {
1375                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1376                 goto out_close;
1377         }
1378
1379         err = elf_read_build_id(elf, bf, size);
1380
1381         elf_end(elf);
1382 out_close:
1383         close(fd);
1384 out:
1385         return err;
1386 }
1387
1388 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1389 {
1390         int fd, err = -1;
1391
1392         if (size < BUILD_ID_SIZE)
1393                 goto out;
1394
1395         fd = open(filename, O_RDONLY);
1396         if (fd < 0)
1397                 goto out;
1398
1399         while (1) {
1400                 char bf[BUFSIZ];
1401                 GElf_Nhdr nhdr;
1402                 int namesz, descsz;
1403
1404                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1405                         break;
1406
1407                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1408                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1409                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1410                     nhdr.n_namesz == sizeof("GNU")) {
1411                         if (read(fd, bf, namesz) != namesz)
1412                                 break;
1413                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1414                                 if (read(fd, build_id,
1415                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1416                                         err = 0;
1417                                         break;
1418                                 }
1419                         } else if (read(fd, bf, descsz) != descsz)
1420                                 break;
1421                 } else {
1422                         int n = namesz + descsz;
1423                         if (read(fd, bf, n) != n)
1424                                 break;
1425                 }
1426         }
1427         close(fd);
1428 out:
1429         return err;
1430 }
1431
1432 char dso__symtab_origin(const struct dso *self)
1433 {
1434         static const char origin[] = {
1435                 [SYMTAB__KALLSYMS]            = 'k',
1436                 [SYMTAB__JAVA_JIT]            = 'j',
1437                 [SYMTAB__BUILD_ID_CACHE]      = 'B',
1438                 [SYMTAB__FEDORA_DEBUGINFO]    = 'f',
1439                 [SYMTAB__UBUNTU_DEBUGINFO]    = 'u',
1440                 [SYMTAB__BUILDID_DEBUGINFO]   = 'b',
1441                 [SYMTAB__SYSTEM_PATH_DSO]     = 'd',
1442                 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1443                 [SYMTAB__GUEST_KALLSYMS]      =  'g',
1444                 [SYMTAB__GUEST_KMODULE]       =  'G',
1445         };
1446
1447         if (self == NULL || self->symtab_type == SYMTAB__NOT_FOUND)
1448                 return '!';
1449         return origin[self->symtab_type];
1450 }
1451
1452 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1453 {
1454         int size = PATH_MAX;
1455         char *name;
1456         int ret = -1;
1457         int fd;
1458         struct machine *machine;
1459         const char *root_dir;
1460         int want_symtab;
1461
1462         dso__set_loaded(self, map->type);
1463
1464         if (self->kernel == DSO_TYPE_KERNEL)
1465                 return dso__load_kernel_sym(self, map, filter);
1466         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1467                 return dso__load_guest_kernel_sym(self, map, filter);
1468
1469         if (map->groups && map->groups->machine)
1470                 machine = map->groups->machine;
1471         else
1472                 machine = NULL;
1473
1474         name = malloc(size);
1475         if (!name)
1476                 return -1;
1477
1478         self->adjust_symbols = 0;
1479
1480         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1481                 ret = dso__load_perf_map(self, map, filter);
1482                 self->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1483                                               SYMTAB__NOT_FOUND;
1484                 return ret;
1485         }
1486
1487         /* Iterate over candidate debug images.
1488          * On the first pass, only load images if they have a full symtab.
1489          * Failing that, do a second pass where we accept .dynsym also
1490          */
1491         want_symtab = 1;
1492 restart:
1493         for (self->symtab_type = SYMTAB__BUILD_ID_CACHE;
1494              self->symtab_type != SYMTAB__NOT_FOUND;
1495              self->symtab_type++) {
1496                 switch (self->symtab_type) {
1497                 case SYMTAB__BUILD_ID_CACHE:
1498                         /* skip the locally configured cache if a symfs is given */
1499                         if (symbol_conf.symfs[0] ||
1500                             (dso__build_id_filename(self, name, size) == NULL)) {
1501                                 continue;
1502                         }
1503                         break;
1504                 case SYMTAB__FEDORA_DEBUGINFO:
1505                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1506                                  symbol_conf.symfs, self->long_name);
1507                         break;
1508                 case SYMTAB__UBUNTU_DEBUGINFO:
1509                         snprintf(name, size, "%s/usr/lib/debug%s",
1510                                  symbol_conf.symfs, self->long_name);
1511                         break;
1512                 case SYMTAB__BUILDID_DEBUGINFO: {
1513                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1514
1515                         if (!self->has_build_id)
1516                                 continue;
1517
1518                         build_id__sprintf(self->build_id,
1519                                           sizeof(self->build_id),
1520                                           build_id_hex);
1521                         snprintf(name, size,
1522                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1523                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1524                         }
1525                         break;
1526                 case SYMTAB__SYSTEM_PATH_DSO:
1527                         snprintf(name, size, "%s%s",
1528                              symbol_conf.symfs, self->long_name);
1529                         break;
1530                 case SYMTAB__GUEST_KMODULE:
1531                         if (map->groups && machine)
1532                                 root_dir = machine->root_dir;
1533                         else
1534                                 root_dir = "";
1535                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1536                                  root_dir, self->long_name);
1537                         break;
1538
1539                 case SYMTAB__SYSTEM_PATH_KMODULE:
1540                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1541                                  self->long_name);
1542                         break;
1543                 default:;
1544                 }
1545
1546                 /* Name is now the name of the next image to try */
1547                 fd = open(name, O_RDONLY);
1548                 if (fd < 0)
1549                         continue;
1550
1551                 ret = dso__load_sym(self, map, name, fd, filter, 0,
1552                                     want_symtab);
1553                 close(fd);
1554
1555                 /*
1556                  * Some people seem to have debuginfo files _WITHOUT_ debug
1557                  * info!?!?
1558                  */
1559                 if (!ret)
1560                         continue;
1561
1562                 if (ret > 0) {
1563                         int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1564                         if (nr_plt > 0)
1565                                 ret += nr_plt;
1566                         break;
1567                 }
1568         }
1569
1570         /*
1571          * If we wanted a full symtab but no image had one,
1572          * relax our requirements and repeat the search.
1573          */
1574         if (ret <= 0 && want_symtab) {
1575                 want_symtab = 0;
1576                 goto restart;
1577         }
1578
1579         free(name);
1580         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1581                 return 0;
1582         return ret;
1583 }
1584
1585 struct map *map_groups__find_by_name(struct map_groups *self,
1586                                      enum map_type type, const char *name)
1587 {
1588         struct rb_node *nd;
1589
1590         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1591                 struct map *map = rb_entry(nd, struct map, rb_node);
1592
1593                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1594                         return map;
1595         }
1596
1597         return NULL;
1598 }
1599
1600 static int dso__kernel_module_get_build_id(struct dso *self,
1601                                 const char *root_dir)
1602 {
1603         char filename[PATH_MAX];
1604         /*
1605          * kernel module short names are of the form "[module]" and
1606          * we need just "module" here.
1607          */
1608         const char *name = self->short_name + 1;
1609
1610         snprintf(filename, sizeof(filename),
1611                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1612                  root_dir, (int)strlen(name) - 1, name);
1613
1614         if (sysfs__read_build_id(filename, self->build_id,
1615                                  sizeof(self->build_id)) == 0)
1616                 self->has_build_id = true;
1617
1618         return 0;
1619 }
1620
1621 static int map_groups__set_modules_path_dir(struct map_groups *self,
1622                                 const char *dir_name)
1623 {
1624         struct dirent *dent;
1625         DIR *dir = opendir(dir_name);
1626         int ret = 0;
1627
1628         if (!dir) {
1629                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1630                 return -1;
1631         }
1632
1633         while ((dent = readdir(dir)) != NULL) {
1634                 char path[PATH_MAX];
1635                 struct stat st;
1636
1637                 /*sshfs might return bad dent->d_type, so we have to stat*/
1638                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1639                 if (stat(path, &st))
1640                         continue;
1641
1642                 if (S_ISDIR(st.st_mode)) {
1643                         if (!strcmp(dent->d_name, ".") ||
1644                             !strcmp(dent->d_name, ".."))
1645                                 continue;
1646
1647                         snprintf(path, sizeof(path), "%s/%s",
1648                                  dir_name, dent->d_name);
1649                         ret = map_groups__set_modules_path_dir(self, path);
1650                         if (ret < 0)
1651                                 goto out;
1652                 } else {
1653                         char *dot = strrchr(dent->d_name, '.'),
1654                              dso_name[PATH_MAX];
1655                         struct map *map;
1656                         char *long_name;
1657
1658                         if (dot == NULL || strcmp(dot, ".ko"))
1659                                 continue;
1660                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1661                                  (int)(dot - dent->d_name), dent->d_name);
1662
1663                         strxfrchar(dso_name, '-', '_');
1664                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1665                         if (map == NULL)
1666                                 continue;
1667
1668                         snprintf(path, sizeof(path), "%s/%s",
1669                                  dir_name, dent->d_name);
1670
1671                         long_name = strdup(path);
1672                         if (long_name == NULL) {
1673                                 ret = -1;
1674                                 goto out;
1675                         }
1676                         dso__set_long_name(map->dso, long_name);
1677                         map->dso->lname_alloc = 1;
1678                         dso__kernel_module_get_build_id(map->dso, "");
1679                 }
1680         }
1681
1682 out:
1683         closedir(dir);
1684         return ret;
1685 }
1686
1687 static char *get_kernel_version(const char *root_dir)
1688 {
1689         char version[PATH_MAX];
1690         FILE *file;
1691         char *name, *tmp;
1692         const char *prefix = "Linux version ";
1693
1694         sprintf(version, "%s/proc/version", root_dir);
1695         file = fopen(version, "r");
1696         if (!file)
1697                 return NULL;
1698
1699         version[0] = '\0';
1700         tmp = fgets(version, sizeof(version), file);
1701         fclose(file);
1702
1703         name = strstr(version, prefix);
1704         if (!name)
1705                 return NULL;
1706         name += strlen(prefix);
1707         tmp = strchr(name, ' ');
1708         if (tmp)
1709                 *tmp = '\0';
1710
1711         return strdup(name);
1712 }
1713
1714 static int machine__set_modules_path(struct machine *self)
1715 {
1716         char *version;
1717         char modules_path[PATH_MAX];
1718
1719         version = get_kernel_version(self->root_dir);
1720         if (!version)
1721                 return -1;
1722
1723         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1724                  self->root_dir, version);
1725         free(version);
1726
1727         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1728 }
1729
1730 /*
1731  * Constructor variant for modules (where we know from /proc/modules where
1732  * they are loaded) and for vmlinux, where only after we load all the
1733  * symbols we'll know where it starts and ends.
1734  */
1735 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1736 {
1737         struct map *self = calloc(1, (sizeof(*self) +
1738                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1739         if (self != NULL) {
1740                 /*
1741                  * ->end will be filled after we load all the symbols
1742                  */
1743                 map__init(self, type, start, 0, 0, dso);
1744         }
1745
1746         return self;
1747 }
1748
1749 struct map *machine__new_module(struct machine *self, u64 start,
1750                                 const char *filename)
1751 {
1752         struct map *map;
1753         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1754
1755         if (dso == NULL)
1756                 return NULL;
1757
1758         map = map__new2(start, dso, MAP__FUNCTION);
1759         if (map == NULL)
1760                 return NULL;
1761
1762         if (machine__is_host(self))
1763                 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1764         else
1765                 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1766         map_groups__insert(&self->kmaps, map);
1767         return map;
1768 }
1769
1770 static int machine__create_modules(struct machine *self)
1771 {
1772         char *line = NULL;
1773         size_t n;
1774         FILE *file;
1775         struct map *map;
1776         const char *modules;
1777         char path[PATH_MAX];
1778
1779         if (machine__is_default_guest(self))
1780                 modules = symbol_conf.default_guest_modules;
1781         else {
1782                 sprintf(path, "%s/proc/modules", self->root_dir);
1783                 modules = path;
1784         }
1785
1786         file = fopen(modules, "r");
1787         if (file == NULL)
1788                 return -1;
1789
1790         while (!feof(file)) {
1791                 char name[PATH_MAX];
1792                 u64 start;
1793                 char *sep;
1794                 int line_len;
1795
1796                 line_len = getline(&line, &n, file);
1797                 if (line_len < 0)
1798                         break;
1799
1800                 if (!line)
1801                         goto out_failure;
1802
1803                 line[--line_len] = '\0'; /* \n */
1804
1805                 sep = strrchr(line, 'x');
1806                 if (sep == NULL)
1807                         continue;
1808
1809                 hex2u64(sep + 1, &start);
1810
1811                 sep = strchr(line, ' ');
1812                 if (sep == NULL)
1813                         continue;
1814
1815                 *sep = '\0';
1816
1817                 snprintf(name, sizeof(name), "[%s]", line);
1818                 map = machine__new_module(self, start, name);
1819                 if (map == NULL)
1820                         goto out_delete_line;
1821                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1822         }
1823
1824         free(line);
1825         fclose(file);
1826
1827         return machine__set_modules_path(self);
1828
1829 out_delete_line:
1830         free(line);
1831 out_failure:
1832         return -1;
1833 }
1834
1835 int dso__load_vmlinux(struct dso *self, struct map *map,
1836                       const char *vmlinux, symbol_filter_t filter)
1837 {
1838         int err = -1, fd;
1839         char symfs_vmlinux[PATH_MAX];
1840
1841         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1842                  symbol_conf.symfs, vmlinux);
1843         fd = open(symfs_vmlinux, O_RDONLY);
1844         if (fd < 0)
1845                 return -1;
1846
1847         dso__set_long_name(self, (char *)vmlinux);
1848         dso__set_loaded(self, map->type);
1849         err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
1850         close(fd);
1851
1852         if (err > 0)
1853                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1854
1855         return err;
1856 }
1857
1858 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1859                            symbol_filter_t filter)
1860 {
1861         int i, err = 0;
1862         char *filename;
1863
1864         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1865                  vmlinux_path__nr_entries + 1);
1866
1867         filename = dso__build_id_filename(self, NULL, 0);
1868         if (filename != NULL) {
1869                 err = dso__load_vmlinux(self, map, filename, filter);
1870                 if (err > 0) {
1871                         dso__set_long_name(self, filename);
1872                         goto out;
1873                 }
1874                 free(filename);
1875         }
1876
1877         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1878                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1879                 if (err > 0) {
1880                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1881                         break;
1882                 }
1883         }
1884 out:
1885         return err;
1886 }
1887
1888 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1889                                 symbol_filter_t filter)
1890 {
1891         int err;
1892         const char *kallsyms_filename = NULL;
1893         char *kallsyms_allocated_filename = NULL;
1894         /*
1895          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1896          * it and only it, reporting errors to the user if it cannot be used.
1897          *
1898          * For instance, try to analyse an ARM perf.data file _without_ a
1899          * build-id, or if the user specifies the wrong path to the right
1900          * vmlinux file, obviously we can't fallback to another vmlinux (a
1901          * x86_86 one, on the machine where analysis is being performed, say),
1902          * or worse, /proc/kallsyms.
1903          *
1904          * If the specified file _has_ a build-id and there is a build-id
1905          * section in the perf.data file, we will still do the expected
1906          * validation in dso__load_vmlinux and will bail out if they don't
1907          * match.
1908          */
1909         if (symbol_conf.kallsyms_name != NULL) {
1910                 kallsyms_filename = symbol_conf.kallsyms_name;
1911                 goto do_kallsyms;
1912         }
1913
1914         if (symbol_conf.vmlinux_name != NULL) {
1915                 err = dso__load_vmlinux(self, map,
1916                                         symbol_conf.vmlinux_name, filter);
1917                 if (err > 0) {
1918                         dso__set_long_name(self,
1919                                            strdup(symbol_conf.vmlinux_name));
1920                         goto out_fixup;
1921                 }
1922                 return err;
1923         }
1924
1925         if (vmlinux_path != NULL) {
1926                 err = dso__load_vmlinux_path(self, map, filter);
1927                 if (err > 0)
1928                         goto out_fixup;
1929         }
1930
1931         /* do not try local files if a symfs was given */
1932         if (symbol_conf.symfs[0] != 0)
1933                 return -1;
1934
1935         /*
1936          * Say the kernel DSO was created when processing the build-id header table,
1937          * we have a build-id, so check if it is the same as the running kernel,
1938          * using it if it is.
1939          */
1940         if (self->has_build_id) {
1941                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1942                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1943
1944                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1945                                          sizeof(kallsyms_build_id)) == 0) {
1946                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1947                                 kallsyms_filename = "/proc/kallsyms";
1948                                 goto do_kallsyms;
1949                         }
1950                 }
1951                 /*
1952                  * Now look if we have it on the build-id cache in
1953                  * $HOME/.debug/[kernel.kallsyms].
1954                  */
1955                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1956                                   sbuild_id);
1957
1958                 if (asprintf(&kallsyms_allocated_filename,
1959                              "%s/.debug/[kernel.kallsyms]/%s",
1960                              getenv("HOME"), sbuild_id) == -1) {
1961                         pr_err("Not enough memory for kallsyms file lookup\n");
1962                         return -1;
1963                 }
1964
1965                 kallsyms_filename = kallsyms_allocated_filename;
1966
1967                 if (access(kallsyms_filename, F_OK)) {
1968                         pr_err("No kallsyms or vmlinux with build-id %s "
1969                                "was found\n", sbuild_id);
1970                         free(kallsyms_allocated_filename);
1971                         return -1;
1972                 }
1973         } else {
1974                 /*
1975                  * Last resort, if we don't have a build-id and couldn't find
1976                  * any vmlinux file, try the running kernel kallsyms table.
1977                  */
1978                 kallsyms_filename = "/proc/kallsyms";
1979         }
1980
1981 do_kallsyms:
1982         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1983         if (err > 0)
1984                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1985         free(kallsyms_allocated_filename);
1986
1987         if (err > 0) {
1988 out_fixup:
1989                 if (kallsyms_filename != NULL)
1990                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1991                 map__fixup_start(map);
1992                 map__fixup_end(map);
1993         }
1994
1995         return err;
1996 }
1997
1998 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1999                                 symbol_filter_t filter)
2000 {
2001         int err;
2002         const char *kallsyms_filename = NULL;
2003         struct machine *machine;
2004         char path[PATH_MAX];
2005
2006         if (!map->groups) {
2007                 pr_debug("Guest kernel map hasn't the point to groups\n");
2008                 return -1;
2009         }
2010         machine = map->groups->machine;
2011
2012         if (machine__is_default_guest(machine)) {
2013                 /*
2014                  * if the user specified a vmlinux filename, use it and only
2015                  * it, reporting errors to the user if it cannot be used.
2016                  * Or use file guest_kallsyms inputted by user on commandline
2017                  */
2018                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2019                         err = dso__load_vmlinux(self, map,
2020                                 symbol_conf.default_guest_vmlinux_name, filter);
2021                         goto out_try_fixup;
2022                 }
2023
2024                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2025                 if (!kallsyms_filename)
2026                         return -1;
2027         } else {
2028                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2029                 kallsyms_filename = path;
2030         }
2031
2032         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
2033         if (err > 0)
2034                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2035
2036 out_try_fixup:
2037         if (err > 0) {
2038                 if (kallsyms_filename != NULL) {
2039                         machine__mmap_name(machine, path, sizeof(path));
2040                         dso__set_long_name(self, strdup(path));
2041                 }
2042                 map__fixup_start(map);
2043                 map__fixup_end(map);
2044         }
2045
2046         return err;
2047 }
2048
2049 static void dsos__add(struct list_head *head, struct dso *dso)
2050 {
2051         list_add_tail(&dso->node, head);
2052 }
2053
2054 static struct dso *dsos__find(struct list_head *head, const char *name)
2055 {
2056         struct dso *pos;
2057
2058         list_for_each_entry(pos, head, node)
2059                 if (strcmp(pos->long_name, name) == 0)
2060                         return pos;
2061         return NULL;
2062 }
2063
2064 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2065 {
2066         struct dso *dso = dsos__find(head, name);
2067
2068         if (!dso) {
2069                 dso = dso__new(name);
2070                 if (dso != NULL) {
2071                         dsos__add(head, dso);
2072                         dso__set_basename(dso);
2073                 }
2074         }
2075
2076         return dso;
2077 }
2078
2079 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2080 {
2081         struct dso *pos;
2082         size_t ret = 0;
2083
2084         list_for_each_entry(pos, head, node) {
2085                 int i;
2086                 for (i = 0; i < MAP__NR_TYPES; ++i)
2087                         ret += dso__fprintf(pos, i, fp);
2088         }
2089
2090         return ret;
2091 }
2092
2093 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2094 {
2095         struct rb_node *nd;
2096         size_t ret = 0;
2097
2098         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2099                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2100                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2101                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2102         }
2103
2104         return ret;
2105 }
2106
2107 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2108                                       bool with_hits)
2109 {
2110         struct dso *pos;
2111         size_t ret = 0;
2112
2113         list_for_each_entry(pos, head, node) {
2114                 if (with_hits && !pos->hit)
2115                         continue;
2116                 ret += dso__fprintf_buildid(pos, fp);
2117                 ret += fprintf(fp, " %s\n", pos->long_name);
2118         }
2119         return ret;
2120 }
2121
2122 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2123 {
2124         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2125                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2126 }
2127
2128 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2129 {
2130         struct rb_node *nd;
2131         size_t ret = 0;
2132
2133         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2134                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2135                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2136         }
2137         return ret;
2138 }
2139
2140 struct dso *dso__new_kernel(const char *name)
2141 {
2142         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2143
2144         if (self != NULL) {
2145                 dso__set_short_name(self, "[kernel]");
2146                 self->kernel = DSO_TYPE_KERNEL;
2147         }
2148
2149         return self;
2150 }
2151
2152 static struct dso *dso__new_guest_kernel(struct machine *machine,
2153                                         const char *name)
2154 {
2155         char bf[PATH_MAX];
2156         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2157
2158         if (self != NULL) {
2159                 dso__set_short_name(self, "[guest.kernel]");
2160                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2161         }
2162
2163         return self;
2164 }
2165
2166 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2167 {
2168         char path[PATH_MAX];
2169
2170         if (machine__is_default_guest(machine))
2171                 return;
2172         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2173         if (sysfs__read_build_id(path, self->build_id,
2174                                  sizeof(self->build_id)) == 0)
2175                 self->has_build_id = true;
2176 }
2177
2178 static struct dso *machine__create_kernel(struct machine *self)
2179 {
2180         const char *vmlinux_name = NULL;
2181         struct dso *kernel;
2182
2183         if (machine__is_host(self)) {
2184                 vmlinux_name = symbol_conf.vmlinux_name;
2185                 kernel = dso__new_kernel(vmlinux_name);
2186         } else {
2187                 if (machine__is_default_guest(self))
2188                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2189                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2190         }
2191
2192         if (kernel != NULL) {
2193                 dso__read_running_kernel_build_id(kernel, self);
2194                 dsos__add(&self->kernel_dsos, kernel);
2195         }
2196         return kernel;
2197 }
2198
2199 struct process_args {
2200         u64 start;
2201 };
2202
2203 static int symbol__in_kernel(void *arg, const char *name,
2204                              char type __used, u64 start, u64 end __used)
2205 {
2206         struct process_args *args = arg;
2207
2208         if (strchr(name, '['))
2209                 return 0;
2210
2211         args->start = start;
2212         return 1;
2213 }
2214
2215 /* Figure out the start address of kernel map from /proc/kallsyms */
2216 static u64 machine__get_kernel_start_addr(struct machine *machine)
2217 {
2218         const char *filename;
2219         char path[PATH_MAX];
2220         struct process_args args;
2221
2222         if (machine__is_host(machine)) {
2223                 filename = "/proc/kallsyms";
2224         } else {
2225                 if (machine__is_default_guest(machine))
2226                         filename = (char *)symbol_conf.default_guest_kallsyms;
2227                 else {
2228                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2229                         filename = path;
2230                 }
2231         }
2232
2233         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2234                 return 0;
2235
2236         return args.start;
2237 }
2238
2239 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2240 {
2241         enum map_type type;
2242         u64 start = machine__get_kernel_start_addr(self);
2243
2244         for (type = 0; type < MAP__NR_TYPES; ++type) {
2245                 struct kmap *kmap;
2246
2247                 self->vmlinux_maps[type] = map__new2(start, kernel, type);
2248                 if (self->vmlinux_maps[type] == NULL)
2249                         return -1;
2250
2251                 self->vmlinux_maps[type]->map_ip =
2252                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2253
2254                 kmap = map__kmap(self->vmlinux_maps[type]);
2255                 kmap->kmaps = &self->kmaps;
2256                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2257         }
2258
2259         return 0;
2260 }
2261
2262 void machine__destroy_kernel_maps(struct machine *self)
2263 {
2264         enum map_type type;
2265
2266         for (type = 0; type < MAP__NR_TYPES; ++type) {
2267                 struct kmap *kmap;
2268
2269                 if (self->vmlinux_maps[type] == NULL)
2270                         continue;
2271
2272                 kmap = map__kmap(self->vmlinux_maps[type]);
2273                 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2274                 if (kmap->ref_reloc_sym) {
2275                         /*
2276                          * ref_reloc_sym is shared among all maps, so free just
2277                          * on one of them.
2278                          */
2279                         if (type == MAP__FUNCTION) {
2280                                 free((char *)kmap->ref_reloc_sym->name);
2281                                 kmap->ref_reloc_sym->name = NULL;
2282                                 free(kmap->ref_reloc_sym);
2283                         }
2284                         kmap->ref_reloc_sym = NULL;
2285                 }
2286
2287                 map__delete(self->vmlinux_maps[type]);
2288                 self->vmlinux_maps[type] = NULL;
2289         }
2290 }
2291
2292 int machine__create_kernel_maps(struct machine *self)
2293 {
2294         struct dso *kernel = machine__create_kernel(self);
2295
2296         if (kernel == NULL ||
2297             __machine__create_kernel_maps(self, kernel) < 0)
2298                 return -1;
2299
2300         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2301                 pr_debug("Problems creating module maps, continuing anyway...\n");
2302         /*
2303          * Now that we have all the maps created, just set the ->end of them:
2304          */
2305         map_groups__fixup_end(&self->kmaps);
2306         return 0;
2307 }
2308
2309 static void vmlinux_path__exit(void)
2310 {
2311         while (--vmlinux_path__nr_entries >= 0) {
2312                 free(vmlinux_path[vmlinux_path__nr_entries]);
2313                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2314         }
2315
2316         free(vmlinux_path);
2317         vmlinux_path = NULL;
2318 }
2319
2320 static int vmlinux_path__init(void)
2321 {
2322         struct utsname uts;
2323         char bf[PATH_MAX];
2324
2325         vmlinux_path = malloc(sizeof(char *) * 5);
2326         if (vmlinux_path == NULL)
2327                 return -1;
2328
2329         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2330         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2331                 goto out_fail;
2332         ++vmlinux_path__nr_entries;
2333         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2334         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2335                 goto out_fail;
2336         ++vmlinux_path__nr_entries;
2337
2338         /* only try running kernel version if no symfs was given */
2339         if (symbol_conf.symfs[0] != 0)
2340                 return 0;
2341
2342         if (uname(&uts) < 0)
2343                 return -1;
2344
2345         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2346         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2347         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2348                 goto out_fail;
2349         ++vmlinux_path__nr_entries;
2350         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2351         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2352         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2353                 goto out_fail;
2354         ++vmlinux_path__nr_entries;
2355         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2356                  uts.release);
2357         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2358         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2359                 goto out_fail;
2360         ++vmlinux_path__nr_entries;
2361
2362         return 0;
2363
2364 out_fail:
2365         vmlinux_path__exit();
2366         return -1;
2367 }
2368
2369 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2370 {
2371         int i;
2372         size_t printed = 0;
2373         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2374
2375         if (kdso->has_build_id) {
2376                 char filename[PATH_MAX];
2377                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2378                         printed += fprintf(fp, "[0] %s\n", filename);
2379         }
2380
2381         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2382                 printed += fprintf(fp, "[%d] %s\n",
2383                                    i + kdso->has_build_id, vmlinux_path[i]);
2384
2385         return printed;
2386 }
2387
2388 static int setup_list(struct strlist **list, const char *list_str,
2389                       const char *list_name)
2390 {
2391         if (list_str == NULL)
2392                 return 0;
2393
2394         *list = strlist__new(true, list_str);
2395         if (!*list) {
2396                 pr_err("problems parsing %s list\n", list_name);
2397                 return -1;
2398         }
2399         return 0;
2400 }
2401
2402 int symbol__init(void)
2403 {
2404         const char *symfs;
2405
2406         if (symbol_conf.initialized)
2407                 return 0;
2408
2409         symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2410
2411         elf_version(EV_CURRENT);
2412         if (symbol_conf.sort_by_name)
2413                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2414                                           sizeof(struct symbol));
2415
2416         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2417                 return -1;
2418
2419         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2420                 pr_err("'.' is the only non valid --field-separator argument\n");
2421                 return -1;
2422         }
2423
2424         if (setup_list(&symbol_conf.dso_list,
2425                        symbol_conf.dso_list_str, "dso") < 0)
2426                 return -1;
2427
2428         if (setup_list(&symbol_conf.comm_list,
2429                        symbol_conf.comm_list_str, "comm") < 0)
2430                 goto out_free_dso_list;
2431
2432         if (setup_list(&symbol_conf.sym_list,
2433                        symbol_conf.sym_list_str, "symbol") < 0)
2434                 goto out_free_comm_list;
2435
2436         /*
2437          * A path to symbols of "/" is identical to ""
2438          * reset here for simplicity.
2439          */
2440         symfs = realpath(symbol_conf.symfs, NULL);
2441         if (symfs == NULL)
2442                 symfs = symbol_conf.symfs;
2443         if (strcmp(symfs, "/") == 0)
2444                 symbol_conf.symfs = "";
2445         if (symfs != symbol_conf.symfs)
2446                 free((void *)symfs);
2447
2448         symbol_conf.initialized = true;
2449         return 0;
2450
2451 out_free_dso_list:
2452         strlist__delete(symbol_conf.dso_list);
2453 out_free_comm_list:
2454         strlist__delete(symbol_conf.comm_list);
2455         return -1;
2456 }
2457
2458 void symbol__exit(void)
2459 {
2460         if (!symbol_conf.initialized)
2461                 return;
2462         strlist__delete(symbol_conf.sym_list);
2463         strlist__delete(symbol_conf.dso_list);
2464         strlist__delete(symbol_conf.comm_list);
2465         vmlinux_path__exit();
2466         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2467         symbol_conf.initialized = false;
2468 }
2469
2470 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2471 {
2472         struct machine *machine = machines__findnew(self, pid);
2473
2474         if (machine == NULL)
2475                 return -1;
2476
2477         return machine__create_kernel_maps(machine);
2478 }
2479
2480 static int hex(char ch)
2481 {
2482         if ((ch >= '0') && (ch <= '9'))
2483                 return ch - '0';
2484         if ((ch >= 'a') && (ch <= 'f'))
2485                 return ch - 'a' + 10;
2486         if ((ch >= 'A') && (ch <= 'F'))
2487                 return ch - 'A' + 10;
2488         return -1;
2489 }
2490
2491 /*
2492  * While we find nice hex chars, build a long_val.
2493  * Return number of chars processed.
2494  */
2495 int hex2u64(const char *ptr, u64 *long_val)
2496 {
2497         const char *p = ptr;
2498         *long_val = 0;
2499
2500         while (*p) {
2501                 const int hex_val = hex(*p);
2502
2503                 if (hex_val < 0)
2504                         break;
2505
2506                 *long_val = (*long_val << 4) | hex_val;
2507                 p++;
2508         }
2509
2510         return p - ptr;
2511 }
2512
2513 char *strxfrchar(char *s, char from, char to)
2514 {
2515         char *p = s;
2516
2517         while ((p = strchr(p, from)) != NULL)
2518                 *p++ = to;
2519
2520         return s;
2521 }
2522
2523 int machines__create_guest_kernel_maps(struct rb_root *self)
2524 {
2525         int ret = 0;
2526         struct dirent **namelist = NULL;
2527         int i, items = 0;
2528         char path[PATH_MAX];
2529         pid_t pid;
2530
2531         if (symbol_conf.default_guest_vmlinux_name ||
2532             symbol_conf.default_guest_modules ||
2533             symbol_conf.default_guest_kallsyms) {
2534                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2535         }
2536
2537         if (symbol_conf.guestmount) {
2538                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2539                 if (items <= 0)
2540                         return -ENOENT;
2541                 for (i = 0; i < items; i++) {
2542                         if (!isdigit(namelist[i]->d_name[0])) {
2543                                 /* Filter out . and .. */
2544                                 continue;
2545                         }
2546                         pid = atoi(namelist[i]->d_name);
2547                         sprintf(path, "%s/%s/proc/kallsyms",
2548                                 symbol_conf.guestmount,
2549                                 namelist[i]->d_name);
2550                         ret = access(path, R_OK);
2551                         if (ret) {
2552                                 pr_debug("Can't access file %s\n", path);
2553                                 goto failure;
2554                         }
2555                         machines__create_kernel_maps(self, pid);
2556                 }
2557 failure:
2558                 free(namelist);
2559         }
2560
2561         return ret;
2562 }
2563
2564 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2565 {
2566         struct rb_node *next = rb_first(self);
2567
2568         while (next) {
2569                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2570
2571                 next = rb_next(&pos->rb_node);
2572                 rb_erase(&pos->rb_node, self);
2573                 machine__delete(pos);
2574         }
2575 }
2576
2577 int machine__load_kallsyms(struct machine *self, const char *filename,
2578                            enum map_type type, symbol_filter_t filter)
2579 {
2580         struct map *map = self->vmlinux_maps[type];
2581         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2582
2583         if (ret > 0) {
2584                 dso__set_loaded(map->dso, type);
2585                 /*
2586                  * Since /proc/kallsyms will have multiple sessions for the
2587                  * kernel, with modules between them, fixup the end of all
2588                  * sections.
2589                  */
2590                 __map_groups__fixup_end(&self->kmaps, type);
2591         }
2592
2593         return ret;
2594 }
2595
2596 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2597                                symbol_filter_t filter)
2598 {
2599         struct map *map = self->vmlinux_maps[type];
2600         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2601
2602         if (ret > 0) {
2603                 dso__set_loaded(map->dso, type);
2604                 map__reloc_vmlinux(map);
2605         }
2606
2607         return ret;
2608 }