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_map = map__new2(start, curr_dso,
1200                                                      map->type);
1201                                 if (curr_map == NULL) {
1202                                         dso__delete(curr_dso);
1203                                         goto out_elf_end;
1204                                 }
1205                                 curr_map->map_ip = identity__map_ip;
1206                                 curr_map->unmap_ip = identity__map_ip;
1207                                 curr_dso->symtab_type = self->symtab_type;
1208                                 map_groups__insert(kmap->kmaps, curr_map);
1209                                 dsos__add(&self->node, curr_dso);
1210                                 dso__set_loaded(curr_dso, map->type);
1211                         } else
1212                                 curr_dso = curr_map->dso;
1213
1214                         goto new_symbol;
1215                 }
1216
1217                 if (curr_dso->adjust_symbols) {
1218                         pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1219                                   "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1220                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1221                                   (u64)shdr.sh_offset);
1222                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1223                 }
1224                 /*
1225                  * We need to figure out if the object was created from C++ sources
1226                  * DWARF DW_compile_unit has this, but we don't always have access
1227                  * to it...
1228                  */
1229                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1230                 if (demangled != NULL)
1231                         elf_name = demangled;
1232 new_symbol:
1233                 f = symbol__new(sym.st_value, sym.st_size,
1234                                 GELF_ST_BIND(sym.st_info), elf_name);
1235                 free(demangled);
1236                 if (!f)
1237                         goto out_elf_end;
1238
1239                 if (filter && filter(curr_map, f))
1240                         symbol__delete(f);
1241                 else {
1242                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1243                         nr++;
1244                 }
1245         }
1246
1247         /*
1248          * For misannotated, zeroed, ASM function sizes.
1249          */
1250         if (nr > 0) {
1251                 symbols__fixup_end(&self->symbols[map->type]);
1252                 if (kmap) {
1253                         /*
1254                          * We need to fixup this here too because we create new
1255                          * maps here, for things like vsyscall sections.
1256                          */
1257                         __map_groups__fixup_end(kmap->kmaps, map->type);
1258                 }
1259         }
1260         err = nr;
1261 out_elf_end:
1262         elf_end(elf);
1263 out_close:
1264         return err;
1265 }
1266
1267 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1268 {
1269         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1270 }
1271
1272 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1273 {
1274         bool have_build_id = false;
1275         struct dso *pos;
1276
1277         list_for_each_entry(pos, head, node) {
1278                 if (with_hits && !pos->hit)
1279                         continue;
1280                 if (pos->has_build_id) {
1281                         have_build_id = true;
1282                         continue;
1283                 }
1284                 if (filename__read_build_id(pos->long_name, pos->build_id,
1285                                             sizeof(pos->build_id)) > 0) {
1286                         have_build_id     = true;
1287                         pos->has_build_id = true;
1288                 }
1289         }
1290
1291         return have_build_id;
1292 }
1293
1294 /*
1295  * Align offset to 4 bytes as needed for note name and descriptor data.
1296  */
1297 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1298
1299 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1300 {
1301         int err = -1;
1302         GElf_Ehdr ehdr;
1303         GElf_Shdr shdr;
1304         Elf_Data *data;
1305         Elf_Scn *sec;
1306         Elf_Kind ek;
1307         void *ptr;
1308
1309         if (size < BUILD_ID_SIZE)
1310                 goto out;
1311
1312         ek = elf_kind(elf);
1313         if (ek != ELF_K_ELF)
1314                 goto out;
1315
1316         if (gelf_getehdr(elf, &ehdr) == NULL) {
1317                 pr_err("%s: cannot get elf header.\n", __func__);
1318                 goto out;
1319         }
1320
1321         sec = elf_section_by_name(elf, &ehdr, &shdr,
1322                                   ".note.gnu.build-id", NULL);
1323         if (sec == NULL) {
1324                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1325                                           ".notes", NULL);
1326                 if (sec == NULL)
1327                         goto out;
1328         }
1329
1330         data = elf_getdata(sec, NULL);
1331         if (data == NULL)
1332                 goto out;
1333
1334         ptr = data->d_buf;
1335         while (ptr < (data->d_buf + data->d_size)) {
1336                 GElf_Nhdr *nhdr = ptr;
1337                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1338                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1339                 const char *name;
1340
1341                 ptr += sizeof(*nhdr);
1342                 name = ptr;
1343                 ptr += namesz;
1344                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1345                     nhdr->n_namesz == sizeof("GNU")) {
1346                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1347                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1348                                 err = BUILD_ID_SIZE;
1349                                 break;
1350                         }
1351                 }
1352                 ptr += descsz;
1353         }
1354
1355 out:
1356         return err;
1357 }
1358
1359 int filename__read_build_id(const char *filename, void *bf, size_t size)
1360 {
1361         int fd, err = -1;
1362         Elf *elf;
1363
1364         if (size < BUILD_ID_SIZE)
1365                 goto out;
1366
1367         fd = open(filename, O_RDONLY);
1368         if (fd < 0)
1369                 goto out;
1370
1371         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1372         if (elf == NULL) {
1373                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1374                 goto out_close;
1375         }
1376
1377         err = elf_read_build_id(elf, bf, size);
1378
1379         elf_end(elf);
1380 out_close:
1381         close(fd);
1382 out:
1383         return err;
1384 }
1385
1386 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1387 {
1388         int fd, err = -1;
1389
1390         if (size < BUILD_ID_SIZE)
1391                 goto out;
1392
1393         fd = open(filename, O_RDONLY);
1394         if (fd < 0)
1395                 goto out;
1396
1397         while (1) {
1398                 char bf[BUFSIZ];
1399                 GElf_Nhdr nhdr;
1400                 int namesz, descsz;
1401
1402                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1403                         break;
1404
1405                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1406                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1407                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1408                     nhdr.n_namesz == sizeof("GNU")) {
1409                         if (read(fd, bf, namesz) != namesz)
1410                                 break;
1411                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1412                                 if (read(fd, build_id,
1413                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1414                                         err = 0;
1415                                         break;
1416                                 }
1417                         } else if (read(fd, bf, descsz) != descsz)
1418                                 break;
1419                 } else {
1420                         int n = namesz + descsz;
1421                         if (read(fd, bf, n) != n)
1422                                 break;
1423                 }
1424         }
1425         close(fd);
1426 out:
1427         return err;
1428 }
1429
1430 char dso__symtab_origin(const struct dso *self)
1431 {
1432         static const char origin[] = {
1433                 [SYMTAB__KALLSYMS]            = 'k',
1434                 [SYMTAB__JAVA_JIT]            = 'j',
1435                 [SYMTAB__BUILD_ID_CACHE]      = 'B',
1436                 [SYMTAB__FEDORA_DEBUGINFO]    = 'f',
1437                 [SYMTAB__UBUNTU_DEBUGINFO]    = 'u',
1438                 [SYMTAB__BUILDID_DEBUGINFO]   = 'b',
1439                 [SYMTAB__SYSTEM_PATH_DSO]     = 'd',
1440                 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1441                 [SYMTAB__GUEST_KALLSYMS]      =  'g',
1442                 [SYMTAB__GUEST_KMODULE]       =  'G',
1443         };
1444
1445         if (self == NULL || self->symtab_type == SYMTAB__NOT_FOUND)
1446                 return '!';
1447         return origin[self->symtab_type];
1448 }
1449
1450 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1451 {
1452         int size = PATH_MAX;
1453         char *name;
1454         int ret = -1;
1455         int fd;
1456         struct machine *machine;
1457         const char *root_dir;
1458         int want_symtab;
1459
1460         dso__set_loaded(self, map->type);
1461
1462         if (self->kernel == DSO_TYPE_KERNEL)
1463                 return dso__load_kernel_sym(self, map, filter);
1464         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1465                 return dso__load_guest_kernel_sym(self, map, filter);
1466
1467         if (map->groups && map->groups->machine)
1468                 machine = map->groups->machine;
1469         else
1470                 machine = NULL;
1471
1472         name = malloc(size);
1473         if (!name)
1474                 return -1;
1475
1476         self->adjust_symbols = 0;
1477
1478         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1479                 ret = dso__load_perf_map(self, map, filter);
1480                 self->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1481                                               SYMTAB__NOT_FOUND;
1482                 return ret;
1483         }
1484
1485         /* Iterate over candidate debug images.
1486          * On the first pass, only load images if they have a full symtab.
1487          * Failing that, do a second pass where we accept .dynsym also
1488          */
1489         want_symtab = 1;
1490 restart:
1491         for (self->symtab_type = SYMTAB__BUILD_ID_CACHE;
1492              self->symtab_type != SYMTAB__NOT_FOUND;
1493              self->symtab_type++) {
1494                 switch (self->symtab_type) {
1495                 case SYMTAB__BUILD_ID_CACHE:
1496                         /* skip the locally configured cache if a symfs is given */
1497                         if (symbol_conf.symfs[0] ||
1498                             (dso__build_id_filename(self, name, size) == NULL)) {
1499                                 continue;
1500                         }
1501                         break;
1502                 case SYMTAB__FEDORA_DEBUGINFO:
1503                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1504                                  symbol_conf.symfs, self->long_name);
1505                         break;
1506                 case SYMTAB__UBUNTU_DEBUGINFO:
1507                         snprintf(name, size, "%s/usr/lib/debug%s",
1508                                  symbol_conf.symfs, self->long_name);
1509                         break;
1510                 case SYMTAB__BUILDID_DEBUGINFO: {
1511                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1512
1513                         if (!self->has_build_id)
1514                                 continue;
1515
1516                         build_id__sprintf(self->build_id,
1517                                           sizeof(self->build_id),
1518                                           build_id_hex);
1519                         snprintf(name, size,
1520                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1521                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1522                         }
1523                         break;
1524                 case SYMTAB__SYSTEM_PATH_DSO:
1525                         snprintf(name, size, "%s%s",
1526                              symbol_conf.symfs, self->long_name);
1527                         break;
1528                 case SYMTAB__GUEST_KMODULE:
1529                         if (map->groups && machine)
1530                                 root_dir = machine->root_dir;
1531                         else
1532                                 root_dir = "";
1533                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1534                                  root_dir, self->long_name);
1535                         break;
1536
1537                 case SYMTAB__SYSTEM_PATH_KMODULE:
1538                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1539                                  self->long_name);
1540                         break;
1541                 default:;
1542                 }
1543
1544                 /* Name is now the name of the next image to try */
1545                 fd = open(name, O_RDONLY);
1546                 if (fd < 0)
1547                         continue;
1548
1549                 ret = dso__load_sym(self, map, name, fd, filter, 0,
1550                                     want_symtab);
1551                 close(fd);
1552
1553                 /*
1554                  * Some people seem to have debuginfo files _WITHOUT_ debug
1555                  * info!?!?
1556                  */
1557                 if (!ret)
1558                         continue;
1559
1560                 if (ret > 0) {
1561                         int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1562                         if (nr_plt > 0)
1563                                 ret += nr_plt;
1564                         break;
1565                 }
1566         }
1567
1568         /*
1569          * If we wanted a full symtab but no image had one,
1570          * relax our requirements and repeat the search.
1571          */
1572         if (ret <= 0 && want_symtab) {
1573                 want_symtab = 0;
1574                 goto restart;
1575         }
1576
1577         free(name);
1578         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1579                 return 0;
1580         return ret;
1581 }
1582
1583 struct map *map_groups__find_by_name(struct map_groups *self,
1584                                      enum map_type type, const char *name)
1585 {
1586         struct rb_node *nd;
1587
1588         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1589                 struct map *map = rb_entry(nd, struct map, rb_node);
1590
1591                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1592                         return map;
1593         }
1594
1595         return NULL;
1596 }
1597
1598 static int dso__kernel_module_get_build_id(struct dso *self,
1599                                 const char *root_dir)
1600 {
1601         char filename[PATH_MAX];
1602         /*
1603          * kernel module short names are of the form "[module]" and
1604          * we need just "module" here.
1605          */
1606         const char *name = self->short_name + 1;
1607
1608         snprintf(filename, sizeof(filename),
1609                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1610                  root_dir, (int)strlen(name) - 1, name);
1611
1612         if (sysfs__read_build_id(filename, self->build_id,
1613                                  sizeof(self->build_id)) == 0)
1614                 self->has_build_id = true;
1615
1616         return 0;
1617 }
1618
1619 static int map_groups__set_modules_path_dir(struct map_groups *self,
1620                                 const char *dir_name)
1621 {
1622         struct dirent *dent;
1623         DIR *dir = opendir(dir_name);
1624         int ret = 0;
1625
1626         if (!dir) {
1627                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1628                 return -1;
1629         }
1630
1631         while ((dent = readdir(dir)) != NULL) {
1632                 char path[PATH_MAX];
1633                 struct stat st;
1634
1635                 /*sshfs might return bad dent->d_type, so we have to stat*/
1636                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1637                 if (stat(path, &st))
1638                         continue;
1639
1640                 if (S_ISDIR(st.st_mode)) {
1641                         if (!strcmp(dent->d_name, ".") ||
1642                             !strcmp(dent->d_name, ".."))
1643                                 continue;
1644
1645                         snprintf(path, sizeof(path), "%s/%s",
1646                                  dir_name, dent->d_name);
1647                         ret = map_groups__set_modules_path_dir(self, path);
1648                         if (ret < 0)
1649                                 goto out;
1650                 } else {
1651                         char *dot = strrchr(dent->d_name, '.'),
1652                              dso_name[PATH_MAX];
1653                         struct map *map;
1654                         char *long_name;
1655
1656                         if (dot == NULL || strcmp(dot, ".ko"))
1657                                 continue;
1658                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1659                                  (int)(dot - dent->d_name), dent->d_name);
1660
1661                         strxfrchar(dso_name, '-', '_');
1662                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1663                         if (map == NULL)
1664                                 continue;
1665
1666                         snprintf(path, sizeof(path), "%s/%s",
1667                                  dir_name, dent->d_name);
1668
1669                         long_name = strdup(path);
1670                         if (long_name == NULL) {
1671                                 ret = -1;
1672                                 goto out;
1673                         }
1674                         dso__set_long_name(map->dso, long_name);
1675                         map->dso->lname_alloc = 1;
1676                         dso__kernel_module_get_build_id(map->dso, "");
1677                 }
1678         }
1679
1680 out:
1681         closedir(dir);
1682         return ret;
1683 }
1684
1685 static char *get_kernel_version(const char *root_dir)
1686 {
1687         char version[PATH_MAX];
1688         FILE *file;
1689         char *name, *tmp;
1690         const char *prefix = "Linux version ";
1691
1692         sprintf(version, "%s/proc/version", root_dir);
1693         file = fopen(version, "r");
1694         if (!file)
1695                 return NULL;
1696
1697         version[0] = '\0';
1698         tmp = fgets(version, sizeof(version), file);
1699         fclose(file);
1700
1701         name = strstr(version, prefix);
1702         if (!name)
1703                 return NULL;
1704         name += strlen(prefix);
1705         tmp = strchr(name, ' ');
1706         if (tmp)
1707                 *tmp = '\0';
1708
1709         return strdup(name);
1710 }
1711
1712 static int machine__set_modules_path(struct machine *self)
1713 {
1714         char *version;
1715         char modules_path[PATH_MAX];
1716
1717         version = get_kernel_version(self->root_dir);
1718         if (!version)
1719                 return -1;
1720
1721         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1722                  self->root_dir, version);
1723         free(version);
1724
1725         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1726 }
1727
1728 /*
1729  * Constructor variant for modules (where we know from /proc/modules where
1730  * they are loaded) and for vmlinux, where only after we load all the
1731  * symbols we'll know where it starts and ends.
1732  */
1733 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1734 {
1735         struct map *self = calloc(1, (sizeof(*self) +
1736                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1737         if (self != NULL) {
1738                 /*
1739                  * ->end will be filled after we load all the symbols
1740                  */
1741                 map__init(self, type, start, 0, 0, dso);
1742         }
1743
1744         return self;
1745 }
1746
1747 struct map *machine__new_module(struct machine *self, u64 start,
1748                                 const char *filename)
1749 {
1750         struct map *map;
1751         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1752
1753         if (dso == NULL)
1754                 return NULL;
1755
1756         map = map__new2(start, dso, MAP__FUNCTION);
1757         if (map == NULL)
1758                 return NULL;
1759
1760         if (machine__is_host(self))
1761                 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1762         else
1763                 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1764         map_groups__insert(&self->kmaps, map);
1765         return map;
1766 }
1767
1768 static int machine__create_modules(struct machine *self)
1769 {
1770         char *line = NULL;
1771         size_t n;
1772         FILE *file;
1773         struct map *map;
1774         const char *modules;
1775         char path[PATH_MAX];
1776
1777         if (machine__is_default_guest(self))
1778                 modules = symbol_conf.default_guest_modules;
1779         else {
1780                 sprintf(path, "%s/proc/modules", self->root_dir);
1781                 modules = path;
1782         }
1783
1784         file = fopen(modules, "r");
1785         if (file == NULL)
1786                 return -1;
1787
1788         while (!feof(file)) {
1789                 char name[PATH_MAX];
1790                 u64 start;
1791                 char *sep;
1792                 int line_len;
1793
1794                 line_len = getline(&line, &n, file);
1795                 if (line_len < 0)
1796                         break;
1797
1798                 if (!line)
1799                         goto out_failure;
1800
1801                 line[--line_len] = '\0'; /* \n */
1802
1803                 sep = strrchr(line, 'x');
1804                 if (sep == NULL)
1805                         continue;
1806
1807                 hex2u64(sep + 1, &start);
1808
1809                 sep = strchr(line, ' ');
1810                 if (sep == NULL)
1811                         continue;
1812
1813                 *sep = '\0';
1814
1815                 snprintf(name, sizeof(name), "[%s]", line);
1816                 map = machine__new_module(self, start, name);
1817                 if (map == NULL)
1818                         goto out_delete_line;
1819                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1820         }
1821
1822         free(line);
1823         fclose(file);
1824
1825         return machine__set_modules_path(self);
1826
1827 out_delete_line:
1828         free(line);
1829 out_failure:
1830         return -1;
1831 }
1832
1833 int dso__load_vmlinux(struct dso *self, struct map *map,
1834                       const char *vmlinux, symbol_filter_t filter)
1835 {
1836         int err = -1, fd;
1837         char symfs_vmlinux[PATH_MAX];
1838
1839         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1840                  symbol_conf.symfs, vmlinux);
1841         fd = open(symfs_vmlinux, O_RDONLY);
1842         if (fd < 0)
1843                 return -1;
1844
1845         dso__set_loaded(self, map->type);
1846         err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
1847         close(fd);
1848
1849         if (err > 0)
1850                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1851
1852         return err;
1853 }
1854
1855 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1856                            symbol_filter_t filter)
1857 {
1858         int i, err = 0;
1859         char *filename;
1860
1861         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1862                  vmlinux_path__nr_entries + 1);
1863
1864         filename = dso__build_id_filename(self, NULL, 0);
1865         if (filename != NULL) {
1866                 err = dso__load_vmlinux(self, map, filename, filter);
1867                 if (err > 0) {
1868                         dso__set_long_name(self, filename);
1869                         goto out;
1870                 }
1871                 free(filename);
1872         }
1873
1874         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1875                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1876                 if (err > 0) {
1877                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1878                         break;
1879                 }
1880         }
1881 out:
1882         return err;
1883 }
1884
1885 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1886                                 symbol_filter_t filter)
1887 {
1888         int err;
1889         const char *kallsyms_filename = NULL;
1890         char *kallsyms_allocated_filename = NULL;
1891         /*
1892          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1893          * it and only it, reporting errors to the user if it cannot be used.
1894          *
1895          * For instance, try to analyse an ARM perf.data file _without_ a
1896          * build-id, or if the user specifies the wrong path to the right
1897          * vmlinux file, obviously we can't fallback to another vmlinux (a
1898          * x86_86 one, on the machine where analysis is being performed, say),
1899          * or worse, /proc/kallsyms.
1900          *
1901          * If the specified file _has_ a build-id and there is a build-id
1902          * section in the perf.data file, we will still do the expected
1903          * validation in dso__load_vmlinux and will bail out if they don't
1904          * match.
1905          */
1906         if (symbol_conf.kallsyms_name != NULL) {
1907                 kallsyms_filename = symbol_conf.kallsyms_name;
1908                 goto do_kallsyms;
1909         }
1910
1911         if (symbol_conf.vmlinux_name != NULL) {
1912                 err = dso__load_vmlinux(self, map,
1913                                         symbol_conf.vmlinux_name, filter);
1914                 if (err > 0) {
1915                         dso__set_long_name(self,
1916                                            strdup(symbol_conf.vmlinux_name));
1917                         goto out_fixup;
1918                 }
1919                 return err;
1920         }
1921
1922         if (vmlinux_path != NULL) {
1923                 err = dso__load_vmlinux_path(self, map, filter);
1924                 if (err > 0)
1925                         goto out_fixup;
1926         }
1927
1928         /* do not try local files if a symfs was given */
1929         if (symbol_conf.symfs[0] != 0)
1930                 return -1;
1931
1932         /*
1933          * Say the kernel DSO was created when processing the build-id header table,
1934          * we have a build-id, so check if it is the same as the running kernel,
1935          * using it if it is.
1936          */
1937         if (self->has_build_id) {
1938                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1939                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1940
1941                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1942                                          sizeof(kallsyms_build_id)) == 0) {
1943                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1944                                 kallsyms_filename = "/proc/kallsyms";
1945                                 goto do_kallsyms;
1946                         }
1947                 }
1948                 /*
1949                  * Now look if we have it on the build-id cache in
1950                  * $HOME/.debug/[kernel.kallsyms].
1951                  */
1952                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1953                                   sbuild_id);
1954
1955                 if (asprintf(&kallsyms_allocated_filename,
1956                              "%s/.debug/[kernel.kallsyms]/%s",
1957                              getenv("HOME"), sbuild_id) == -1) {
1958                         pr_err("Not enough memory for kallsyms file lookup\n");
1959                         return -1;
1960                 }
1961
1962                 kallsyms_filename = kallsyms_allocated_filename;
1963
1964                 if (access(kallsyms_filename, F_OK)) {
1965                         pr_err("No kallsyms or vmlinux with build-id %s "
1966                                "was found\n", sbuild_id);
1967                         free(kallsyms_allocated_filename);
1968                         return -1;
1969                 }
1970         } else {
1971                 /*
1972                  * Last resort, if we don't have a build-id and couldn't find
1973                  * any vmlinux file, try the running kernel kallsyms table.
1974                  */
1975                 kallsyms_filename = "/proc/kallsyms";
1976         }
1977
1978 do_kallsyms:
1979         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1980         if (err > 0)
1981                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1982         free(kallsyms_allocated_filename);
1983
1984         if (err > 0) {
1985 out_fixup:
1986                 if (kallsyms_filename != NULL)
1987                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1988                 map__fixup_start(map);
1989                 map__fixup_end(map);
1990         }
1991
1992         return err;
1993 }
1994
1995 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1996                                 symbol_filter_t filter)
1997 {
1998         int err;
1999         const char *kallsyms_filename = NULL;
2000         struct machine *machine;
2001         char path[PATH_MAX];
2002
2003         if (!map->groups) {
2004                 pr_debug("Guest kernel map hasn't the point to groups\n");
2005                 return -1;
2006         }
2007         machine = map->groups->machine;
2008
2009         if (machine__is_default_guest(machine)) {
2010                 /*
2011                  * if the user specified a vmlinux filename, use it and only
2012                  * it, reporting errors to the user if it cannot be used.
2013                  * Or use file guest_kallsyms inputted by user on commandline
2014                  */
2015                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2016                         err = dso__load_vmlinux(self, map,
2017                                 symbol_conf.default_guest_vmlinux_name, filter);
2018                         goto out_try_fixup;
2019                 }
2020
2021                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2022                 if (!kallsyms_filename)
2023                         return -1;
2024         } else {
2025                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2026                 kallsyms_filename = path;
2027         }
2028
2029         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
2030         if (err > 0)
2031                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2032
2033 out_try_fixup:
2034         if (err > 0) {
2035                 if (kallsyms_filename != NULL) {
2036                         machine__mmap_name(machine, path, sizeof(path));
2037                         dso__set_long_name(self, strdup(path));
2038                 }
2039                 map__fixup_start(map);
2040                 map__fixup_end(map);
2041         }
2042
2043         return err;
2044 }
2045
2046 static void dsos__add(struct list_head *head, struct dso *dso)
2047 {
2048         list_add_tail(&dso->node, head);
2049 }
2050
2051 static struct dso *dsos__find(struct list_head *head, const char *name)
2052 {
2053         struct dso *pos;
2054
2055         list_for_each_entry(pos, head, node)
2056                 if (strcmp(pos->long_name, name) == 0)
2057                         return pos;
2058         return NULL;
2059 }
2060
2061 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2062 {
2063         struct dso *dso = dsos__find(head, name);
2064
2065         if (!dso) {
2066                 dso = dso__new(name);
2067                 if (dso != NULL) {
2068                         dsos__add(head, dso);
2069                         dso__set_basename(dso);
2070                 }
2071         }
2072
2073         return dso;
2074 }
2075
2076 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2077 {
2078         struct dso *pos;
2079         size_t ret = 0;
2080
2081         list_for_each_entry(pos, head, node) {
2082                 int i;
2083                 for (i = 0; i < MAP__NR_TYPES; ++i)
2084                         ret += dso__fprintf(pos, i, fp);
2085         }
2086
2087         return ret;
2088 }
2089
2090 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2091 {
2092         struct rb_node *nd;
2093         size_t ret = 0;
2094
2095         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2096                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2097                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2098                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2099         }
2100
2101         return ret;
2102 }
2103
2104 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2105                                       bool with_hits)
2106 {
2107         struct dso *pos;
2108         size_t ret = 0;
2109
2110         list_for_each_entry(pos, head, node) {
2111                 if (with_hits && !pos->hit)
2112                         continue;
2113                 ret += dso__fprintf_buildid(pos, fp);
2114                 ret += fprintf(fp, " %s\n", pos->long_name);
2115         }
2116         return ret;
2117 }
2118
2119 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2120 {
2121         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2122                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2123 }
2124
2125 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2126 {
2127         struct rb_node *nd;
2128         size_t ret = 0;
2129
2130         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2131                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2132                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2133         }
2134         return ret;
2135 }
2136
2137 struct dso *dso__new_kernel(const char *name)
2138 {
2139         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2140
2141         if (self != NULL) {
2142                 dso__set_short_name(self, "[kernel]");
2143                 self->kernel = DSO_TYPE_KERNEL;
2144         }
2145
2146         return self;
2147 }
2148
2149 static struct dso *dso__new_guest_kernel(struct machine *machine,
2150                                         const char *name)
2151 {
2152         char bf[PATH_MAX];
2153         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2154
2155         if (self != NULL) {
2156                 dso__set_short_name(self, "[guest.kernel]");
2157                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2158         }
2159
2160         return self;
2161 }
2162
2163 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2164 {
2165         char path[PATH_MAX];
2166
2167         if (machine__is_default_guest(machine))
2168                 return;
2169         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2170         if (sysfs__read_build_id(path, self->build_id,
2171                                  sizeof(self->build_id)) == 0)
2172                 self->has_build_id = true;
2173 }
2174
2175 static struct dso *machine__create_kernel(struct machine *self)
2176 {
2177         const char *vmlinux_name = NULL;
2178         struct dso *kernel;
2179
2180         if (machine__is_host(self)) {
2181                 vmlinux_name = symbol_conf.vmlinux_name;
2182                 kernel = dso__new_kernel(vmlinux_name);
2183         } else {
2184                 if (machine__is_default_guest(self))
2185                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2186                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2187         }
2188
2189         if (kernel != NULL) {
2190                 dso__read_running_kernel_build_id(kernel, self);
2191                 dsos__add(&self->kernel_dsos, kernel);
2192         }
2193         return kernel;
2194 }
2195
2196 struct process_args {
2197         u64 start;
2198 };
2199
2200 static int symbol__in_kernel(void *arg, const char *name,
2201                              char type __used, u64 start, u64 end __used)
2202 {
2203         struct process_args *args = arg;
2204
2205         if (strchr(name, '['))
2206                 return 0;
2207
2208         args->start = start;
2209         return 1;
2210 }
2211
2212 /* Figure out the start address of kernel map from /proc/kallsyms */
2213 static u64 machine__get_kernel_start_addr(struct machine *machine)
2214 {
2215         const char *filename;
2216         char path[PATH_MAX];
2217         struct process_args args;
2218
2219         if (machine__is_host(machine)) {
2220                 filename = "/proc/kallsyms";
2221         } else {
2222                 if (machine__is_default_guest(machine))
2223                         filename = (char *)symbol_conf.default_guest_kallsyms;
2224                 else {
2225                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2226                         filename = path;
2227                 }
2228         }
2229
2230         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2231                 return 0;
2232
2233         return args.start;
2234 }
2235
2236 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2237 {
2238         enum map_type type;
2239         u64 start = machine__get_kernel_start_addr(self);
2240
2241         for (type = 0; type < MAP__NR_TYPES; ++type) {
2242                 struct kmap *kmap;
2243
2244                 self->vmlinux_maps[type] = map__new2(start, kernel, type);
2245                 if (self->vmlinux_maps[type] == NULL)
2246                         return -1;
2247
2248                 self->vmlinux_maps[type]->map_ip =
2249                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2250
2251                 kmap = map__kmap(self->vmlinux_maps[type]);
2252                 kmap->kmaps = &self->kmaps;
2253                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2254         }
2255
2256         return 0;
2257 }
2258
2259 void machine__destroy_kernel_maps(struct machine *self)
2260 {
2261         enum map_type type;
2262
2263         for (type = 0; type < MAP__NR_TYPES; ++type) {
2264                 struct kmap *kmap;
2265
2266                 if (self->vmlinux_maps[type] == NULL)
2267                         continue;
2268
2269                 kmap = map__kmap(self->vmlinux_maps[type]);
2270                 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2271                 if (kmap->ref_reloc_sym) {
2272                         /*
2273                          * ref_reloc_sym is shared among all maps, so free just
2274                          * on one of them.
2275                          */
2276                         if (type == MAP__FUNCTION) {
2277                                 free((char *)kmap->ref_reloc_sym->name);
2278                                 kmap->ref_reloc_sym->name = NULL;
2279                                 free(kmap->ref_reloc_sym);
2280                         }
2281                         kmap->ref_reloc_sym = NULL;
2282                 }
2283
2284                 map__delete(self->vmlinux_maps[type]);
2285                 self->vmlinux_maps[type] = NULL;
2286         }
2287 }
2288
2289 int machine__create_kernel_maps(struct machine *self)
2290 {
2291         struct dso *kernel = machine__create_kernel(self);
2292
2293         if (kernel == NULL ||
2294             __machine__create_kernel_maps(self, kernel) < 0)
2295                 return -1;
2296
2297         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2298                 pr_debug("Problems creating module maps, continuing anyway...\n");
2299         /*
2300          * Now that we have all the maps created, just set the ->end of them:
2301          */
2302         map_groups__fixup_end(&self->kmaps);
2303         return 0;
2304 }
2305
2306 static void vmlinux_path__exit(void)
2307 {
2308         while (--vmlinux_path__nr_entries >= 0) {
2309                 free(vmlinux_path[vmlinux_path__nr_entries]);
2310                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2311         }
2312
2313         free(vmlinux_path);
2314         vmlinux_path = NULL;
2315 }
2316
2317 static int vmlinux_path__init(void)
2318 {
2319         struct utsname uts;
2320         char bf[PATH_MAX];
2321
2322         vmlinux_path = malloc(sizeof(char *) * 5);
2323         if (vmlinux_path == NULL)
2324                 return -1;
2325
2326         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2327         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2328                 goto out_fail;
2329         ++vmlinux_path__nr_entries;
2330         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2331         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2332                 goto out_fail;
2333         ++vmlinux_path__nr_entries;
2334
2335         /* only try running kernel version if no symfs was given */
2336         if (symbol_conf.symfs[0] != 0)
2337                 return 0;
2338
2339         if (uname(&uts) < 0)
2340                 return -1;
2341
2342         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2343         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2344         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2345                 goto out_fail;
2346         ++vmlinux_path__nr_entries;
2347         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2348         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2349         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2350                 goto out_fail;
2351         ++vmlinux_path__nr_entries;
2352         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2353                  uts.release);
2354         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2355         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2356                 goto out_fail;
2357         ++vmlinux_path__nr_entries;
2358
2359         return 0;
2360
2361 out_fail:
2362         vmlinux_path__exit();
2363         return -1;
2364 }
2365
2366 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2367 {
2368         int i;
2369         size_t printed = 0;
2370         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2371
2372         if (kdso->has_build_id) {
2373                 char filename[PATH_MAX];
2374                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2375                         printed += fprintf(fp, "[0] %s\n", filename);
2376         }
2377
2378         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2379                 printed += fprintf(fp, "[%d] %s\n",
2380                                    i + kdso->has_build_id, vmlinux_path[i]);
2381
2382         return printed;
2383 }
2384
2385 static int setup_list(struct strlist **list, const char *list_str,
2386                       const char *list_name)
2387 {
2388         if (list_str == NULL)
2389                 return 0;
2390
2391         *list = strlist__new(true, list_str);
2392         if (!*list) {
2393                 pr_err("problems parsing %s list\n", list_name);
2394                 return -1;
2395         }
2396         return 0;
2397 }
2398
2399 int symbol__init(void)
2400 {
2401         const char *symfs;
2402
2403         if (symbol_conf.initialized)
2404                 return 0;
2405
2406         elf_version(EV_CURRENT);
2407         if (symbol_conf.sort_by_name)
2408                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2409                                           sizeof(struct symbol));
2410
2411         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2412                 return -1;
2413
2414         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2415                 pr_err("'.' is the only non valid --field-separator argument\n");
2416                 return -1;
2417         }
2418
2419         if (setup_list(&symbol_conf.dso_list,
2420                        symbol_conf.dso_list_str, "dso") < 0)
2421                 return -1;
2422
2423         if (setup_list(&symbol_conf.comm_list,
2424                        symbol_conf.comm_list_str, "comm") < 0)
2425                 goto out_free_dso_list;
2426
2427         if (setup_list(&symbol_conf.sym_list,
2428                        symbol_conf.sym_list_str, "symbol") < 0)
2429                 goto out_free_comm_list;
2430
2431         /*
2432          * A path to symbols of "/" is identical to ""
2433          * reset here for simplicity.
2434          */
2435         symfs = realpath(symbol_conf.symfs, NULL);
2436         if (symfs == NULL)
2437                 symfs = symbol_conf.symfs;
2438         if (strcmp(symfs, "/") == 0)
2439                 symbol_conf.symfs = "";
2440         if (symfs != symbol_conf.symfs)
2441                 free((void *)symfs);
2442
2443         symbol_conf.initialized = true;
2444         return 0;
2445
2446 out_free_dso_list:
2447         strlist__delete(symbol_conf.dso_list);
2448 out_free_comm_list:
2449         strlist__delete(symbol_conf.comm_list);
2450         return -1;
2451 }
2452
2453 void symbol__exit(void)
2454 {
2455         if (!symbol_conf.initialized)
2456                 return;
2457         strlist__delete(symbol_conf.sym_list);
2458         strlist__delete(symbol_conf.dso_list);
2459         strlist__delete(symbol_conf.comm_list);
2460         vmlinux_path__exit();
2461         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2462         symbol_conf.initialized = false;
2463 }
2464
2465 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2466 {
2467         struct machine *machine = machines__findnew(self, pid);
2468
2469         if (machine == NULL)
2470                 return -1;
2471
2472         return machine__create_kernel_maps(machine);
2473 }
2474
2475 static int hex(char ch)
2476 {
2477         if ((ch >= '0') && (ch <= '9'))
2478                 return ch - '0';
2479         if ((ch >= 'a') && (ch <= 'f'))
2480                 return ch - 'a' + 10;
2481         if ((ch >= 'A') && (ch <= 'F'))
2482                 return ch - 'A' + 10;
2483         return -1;
2484 }
2485
2486 /*
2487  * While we find nice hex chars, build a long_val.
2488  * Return number of chars processed.
2489  */
2490 int hex2u64(const char *ptr, u64 *long_val)
2491 {
2492         const char *p = ptr;
2493         *long_val = 0;
2494
2495         while (*p) {
2496                 const int hex_val = hex(*p);
2497
2498                 if (hex_val < 0)
2499                         break;
2500
2501                 *long_val = (*long_val << 4) | hex_val;
2502                 p++;
2503         }
2504
2505         return p - ptr;
2506 }
2507
2508 char *strxfrchar(char *s, char from, char to)
2509 {
2510         char *p = s;
2511
2512         while ((p = strchr(p, from)) != NULL)
2513                 *p++ = to;
2514
2515         return s;
2516 }
2517
2518 int machines__create_guest_kernel_maps(struct rb_root *self)
2519 {
2520         int ret = 0;
2521         struct dirent **namelist = NULL;
2522         int i, items = 0;
2523         char path[PATH_MAX];
2524         pid_t pid;
2525
2526         if (symbol_conf.default_guest_vmlinux_name ||
2527             symbol_conf.default_guest_modules ||
2528             symbol_conf.default_guest_kallsyms) {
2529                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2530         }
2531
2532         if (symbol_conf.guestmount) {
2533                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2534                 if (items <= 0)
2535                         return -ENOENT;
2536                 for (i = 0; i < items; i++) {
2537                         if (!isdigit(namelist[i]->d_name[0])) {
2538                                 /* Filter out . and .. */
2539                                 continue;
2540                         }
2541                         pid = atoi(namelist[i]->d_name);
2542                         sprintf(path, "%s/%s/proc/kallsyms",
2543                                 symbol_conf.guestmount,
2544                                 namelist[i]->d_name);
2545                         ret = access(path, R_OK);
2546                         if (ret) {
2547                                 pr_debug("Can't access file %s\n", path);
2548                                 goto failure;
2549                         }
2550                         machines__create_kernel_maps(self, pid);
2551                 }
2552 failure:
2553                 free(namelist);
2554         }
2555
2556         return ret;
2557 }
2558
2559 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2560 {
2561         struct rb_node *next = rb_first(self);
2562
2563         while (next) {
2564                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2565
2566                 next = rb_next(&pos->rb_node);
2567                 rb_erase(&pos->rb_node, self);
2568                 machine__delete(pos);
2569         }
2570 }
2571
2572 int machine__load_kallsyms(struct machine *self, const char *filename,
2573                            enum map_type type, symbol_filter_t filter)
2574 {
2575         struct map *map = self->vmlinux_maps[type];
2576         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2577
2578         if (ret > 0) {
2579                 dso__set_loaded(map->dso, type);
2580                 /*
2581                  * Since /proc/kallsyms will have multiple sessions for the
2582                  * kernel, with modules between them, fixup the end of all
2583                  * sections.
2584                  */
2585                 __map_groups__fixup_end(&self->kmaps, type);
2586         }
2587
2588         return ret;
2589 }
2590
2591 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2592                                symbol_filter_t filter)
2593 {
2594         struct map *map = self->vmlinux_maps[type];
2595         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2596
2597         if (ret > 0) {
2598                 dso__set_loaded(map->dso, type);
2599                 map__reloc_vmlinux(map);
2600         }
2601
2602         return ret;
2603 }