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