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 KSYM_NAME_LEN
  26 #define KSYM_NAME_LEN 128
  27 #endif
  28
  29 #ifndef NT_GNU_BUILD_ID
  30 #define NT_GNU_BUILD_ID 3
  31 #endif
  32
  33 static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
  34 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
  35 static void dsos__add(struct list_head *head, struct dso *dso);
  36 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
  37 static int dso__load_kernel_sym(struct dso *self, struct map *map,
  38                                 symbol_filter_t filter);
  39 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
  40                         symbol_filter_t filter);
  41 static int vmlinux_path__nr_entries;
  42 static char **vmlinux_path;
  43
  44 struct symbol_conf symbol_conf = {
  45         .exclude_other    = true,
  46         .use_modules      = true,
  47         .try_vmlinux_path = true,
  48         .symfs            = "",
  49 };
  50
  51 int dso__name_len(const struct dso *self)
  52 {
  53         if (verbose)
  54                 return self->long_name_len;
  55
  56         return self->short_name_len;
  57 }
  58
  59 bool dso__loaded(const struct dso *self, enum map_type type)
  60 {
  61         return self->loaded & (1 << type);
  62 }
  63
  64 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
  65 {
  66         return self->sorted_by_name & (1 << type);
  67 }
  68
  69 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
  70 {
  71         self->sorted_by_name |= (1 << type);
  72 }
  73
  74 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  75 {
  76         switch (map_type) {
  77         case MAP__FUNCTION:
  78                 return symbol_type == 'T' || symbol_type == 'W';
  79         case MAP__VARIABLE:
  80                 return symbol_type == 'D' || symbol_type == 'd';
  81         default:
  82                 return false;
  83         }
  84 }
  85
  86 static void symbols__fixup_end(struct rb_root *self)
  87 {
  88         struct rb_node *nd, *prevnd = rb_first(self);
  89         struct symbol *curr, *prev;
  90
  91         if (prevnd == NULL)
  92                 return;
  93
  94         curr = rb_entry(prevnd, struct symbol, rb_node);
  95
  96         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  97                 prev = curr;
  98                 curr = rb_entry(nd, struct symbol, rb_node);
  99
 100                 if (prev->end == prev->start && prev->end != curr->start)
 101                         prev->end = curr->start - 1;
 102         }
 103
 104         /* Last entry */
 105         if (curr->end == curr->start)
 106                 curr->end = roundup(curr->start, 4096);
 107 }
 108
 109 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
 110 {
 111         struct map *prev, *curr;
 112         struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
 113
 114         if (prevnd == NULL)
 115                 return;
 116
 117         curr = rb_entry(prevnd, struct map, rb_node);
 118
 119         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 120                 prev = curr;
 121                 curr = rb_entry(nd, struct map, rb_node);
 122                 prev->end = curr->start - 1;
 123         }
 124
 125         /*
 126          * We still haven't the actual symbols, so guess the
 127          * last map final address.
 128          */
 129         curr->end = ~0ULL;
 130 }
 131
 132 static void map_groups__fixup_end(struct map_groups *self)
 133 {
 134         int i;
 135         for (i = 0; i < MAP__NR_TYPES; ++i)
 136                 __map_groups__fixup_end(self, i);
 137 }
 138
 139 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
 140                                   const char *name)
 141 {
 142         size_t namelen = strlen(name) + 1;
 143         struct symbol *self = calloc(1, (symbol_conf.priv_size +
 144                                          sizeof(*self) + namelen));
 145         if (self == NULL)
 146                 return NULL;
 147
 148         if (symbol_conf.priv_size)
 149                 self = ((void *)self) + symbol_conf.priv_size;
 150
 151         self->start   = start;
 152         self->end     = len ? start + len - 1 : start;
 153         self->binding = binding;
 154         self->namelen = namelen - 1;
 155
 156         pr_debug4("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
 157
 158         memcpy(self->name, name, namelen);
 159
 160         return self;
 161 }
 162
 163 void symbol__delete(struct symbol *self)
 164 {
 165         free(((void *)self) - symbol_conf.priv_size);
 166 }
 167
 168 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 169 {
 170         return fprintf(fp, " %llx-%llx %c %s\n",
 171                        self->start, self->end,
 172                        self->binding == STB_GLOBAL ? 'g' :
 173                        self->binding == STB_LOCAL  ? 'l' : 'w',
 174                        self->name);
 175 }
 176
 177 void dso__set_long_name(struct dso *self, char *name)
 178 {
 179         if (name == NULL)
 180                 return;
 181         self->long_name = name;
 182         self->long_name_len = strlen(name);
 183 }
 184
 185 static void dso__set_short_name(struct dso *self, const char *name)
 186 {
 187         if (name == NULL)
 188                 return;
 189         self->short_name = name;
 190         self->short_name_len = strlen(name);
 191 }
 192
 193 static void dso__set_basename(struct dso *self)
 194 {
 195         dso__set_short_name(self, basename(self->long_name));
 196 }
 197
 198 struct dso *dso__new(const char *name)
 199 {
 200         struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
 201
 202         if (self != NULL) {
 203                 int i;
 204                 strcpy(self->name, name);
 205                 dso__set_long_name(self, self->name);
 206                 dso__set_short_name(self, self->name);
 207                 for (i = 0; i < MAP__NR_TYPES; ++i)
 208                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
 209                 self->slen_calculated = 0;
 210                 self->origin = DSO__ORIG_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->origin = DSO__ORIG_GUEST_KERNEL;
 684         else
 685                 self->origin = DSO__ORIG_KERNEL;
 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                 if (self->kernel != DSO_TYPE_USER || kmodule) {
1165                         char dso_name[PATH_MAX];
1166
1167                         if (strcmp(section_name,
1168                                    (curr_dso->short_name +
1169                                     self->short_name_len)) == 0)
1170                                 goto new_symbol;
1171
1172                         if (strcmp(section_name, ".text") == 0) {
1173                                 curr_map = map;
1174                                 curr_dso = self;
1175                                 goto new_symbol;
1176                         }
1177
1178                         snprintf(dso_name, sizeof(dso_name),
1179                                  "%s%s", self->short_name, section_name);
1180
1181                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1182                         if (curr_map == NULL) {
1183                                 u64 start = sym.st_value;
1184
1185                                 if (kmodule)
1186                                         start += map->start + shdr.sh_offset;
1187
1188                                 curr_dso = dso__new(dso_name);
1189                                 if (curr_dso == NULL)
1190                                         goto out_elf_end;
1191                                 curr_dso->kernel = self->kernel;
1192                                 curr_map = map__new2(start, curr_dso,
1193                                                      map->type);
1194                                 if (curr_map == NULL) {
1195                                         dso__delete(curr_dso);
1196                                         goto out_elf_end;
1197                                 }
1198                                 curr_map->map_ip = identity__map_ip;
1199                                 curr_map->unmap_ip = identity__map_ip;
1200                                 curr_dso->origin = self->origin;
1201                                 map_groups__insert(kmap->kmaps, curr_map);
1202                                 dsos__add(&self->node, curr_dso);
1203                                 dso__set_loaded(curr_dso, map->type);
1204                         } else
1205                                 curr_dso = curr_map->dso;
1206
1207                         goto new_symbol;
1208                 }
1209
1210                 if (curr_dso->adjust_symbols) {
1211                         pr_debug4("%s: adjusting symbol: st_value: %#Lx "
1212                                   "sh_addr: %#Lx sh_offset: %#Lx\n", __func__,
1213                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1214                                   (u64)shdr.sh_offset);
1215                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1216                 }
1217                 /*
1218                  * We need to figure out if the object was created from C++ sources
1219                  * DWARF DW_compile_unit has this, but we don't always have access
1220                  * to it...
1221                  */
1222                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1223                 if (demangled != NULL)
1224                         elf_name = demangled;
1225 new_symbol:
1226                 f = symbol__new(sym.st_value, sym.st_size,
1227                                 GELF_ST_BIND(sym.st_info), elf_name);
1228                 free(demangled);
1229                 if (!f)
1230                         goto out_elf_end;
1231
1232                 if (filter && filter(curr_map, f))
1233                         symbol__delete(f);
1234                 else {
1235                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1236                         nr++;
1237                 }
1238         }
1239
1240         /*
1241          * For misannotated, zeroed, ASM function sizes.
1242          */
1243         if (nr > 0) {
1244                 symbols__fixup_end(&self->symbols[map->type]);
1245                 if (kmap) {
1246                         /*
1247                          * We need to fixup this here too because we create new
1248                          * maps here, for things like vsyscall sections.
1249                          */
1250                         __map_groups__fixup_end(kmap->kmaps, map->type);
1251                 }
1252         }
1253         err = nr;
1254 out_elf_end:
1255         elf_end(elf);
1256 out_close:
1257         return err;
1258 }
1259
1260 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1261 {
1262         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1263 }
1264
1265 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1266 {
1267         bool have_build_id = false;
1268         struct dso *pos;
1269
1270         list_for_each_entry(pos, head, node) {
1271                 if (with_hits && !pos->hit)
1272                         continue;
1273                 if (pos->has_build_id) {
1274                         have_build_id = true;
1275                         continue;
1276                 }
1277                 if (filename__read_build_id(pos->long_name, pos->build_id,
1278                                             sizeof(pos->build_id)) > 0) {
1279                         have_build_id     = true;
1280                         pos->has_build_id = true;
1281                 }
1282         }
1283
1284         return have_build_id;
1285 }
1286
1287 /*
1288  * Align offset to 4 bytes as needed for note name and descriptor data.
1289  */
1290 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1291
1292 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1293 {
1294         int err = -1;
1295         GElf_Ehdr ehdr;
1296         GElf_Shdr shdr;
1297         Elf_Data *data;
1298         Elf_Scn *sec;
1299         Elf_Kind ek;
1300         void *ptr;
1301
1302         if (size < BUILD_ID_SIZE)
1303                 goto out;
1304
1305         ek = elf_kind(elf);
1306         if (ek != ELF_K_ELF)
1307                 goto out;
1308
1309         if (gelf_getehdr(elf, &ehdr) == NULL) {
1310                 pr_err("%s: cannot get elf header.\n", __func__);
1311                 goto out;
1312         }
1313
1314         sec = elf_section_by_name(elf, &ehdr, &shdr,
1315                                   ".note.gnu.build-id", NULL);
1316         if (sec == NULL) {
1317                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1318                                           ".notes", NULL);
1319                 if (sec == NULL)
1320                         goto out;
1321         }
1322
1323         data = elf_getdata(sec, NULL);
1324         if (data == NULL)
1325                 goto out;
1326
1327         ptr = data->d_buf;
1328         while (ptr < (data->d_buf + data->d_size)) {
1329                 GElf_Nhdr *nhdr = ptr;
1330                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1331                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1332                 const char *name;
1333
1334                 ptr += sizeof(*nhdr);
1335                 name = ptr;
1336                 ptr += namesz;
1337                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1338                     nhdr->n_namesz == sizeof("GNU")) {
1339                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1340                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1341                                 err = BUILD_ID_SIZE;
1342                                 break;
1343                         }
1344                 }
1345                 ptr += descsz;
1346         }
1347
1348 out:
1349         return err;
1350 }
1351
1352 int filename__read_build_id(const char *filename, void *bf, size_t size)
1353 {
1354         int fd, err = -1;
1355         Elf *elf;
1356
1357         if (size < BUILD_ID_SIZE)
1358                 goto out;
1359
1360         fd = open(filename, O_RDONLY);
1361         if (fd < 0)
1362                 goto out;
1363
1364         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1365         if (elf == NULL) {
1366                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1367                 goto out_close;
1368         }
1369
1370         err = elf_read_build_id(elf, bf, size);
1371
1372         elf_end(elf);
1373 out_close:
1374         close(fd);
1375 out:
1376         return err;
1377 }
1378
1379 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1380 {
1381         int fd, err = -1;
1382
1383         if (size < BUILD_ID_SIZE)
1384                 goto out;
1385
1386         fd = open(filename, O_RDONLY);
1387         if (fd < 0)
1388                 goto out;
1389
1390         while (1) {
1391                 char bf[BUFSIZ];
1392                 GElf_Nhdr nhdr;
1393                 int namesz, descsz;
1394
1395                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1396                         break;
1397
1398                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1399                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1400                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1401                     nhdr.n_namesz == sizeof("GNU")) {
1402                         if (read(fd, bf, namesz) != namesz)
1403                                 break;
1404                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1405                                 if (read(fd, build_id,
1406                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1407                                         err = 0;
1408                                         break;
1409                                 }
1410                         } else if (read(fd, bf, descsz) != descsz)
1411                                 break;
1412                 } else {
1413                         int n = namesz + descsz;
1414                         if (read(fd, bf, n) != n)
1415                                 break;
1416                 }
1417         }
1418         close(fd);
1419 out:
1420         return err;
1421 }
1422
1423 char dso__symtab_origin(const struct dso *self)
1424 {
1425         static const char origin[] = {
1426                 [DSO__ORIG_KERNEL] =   'k',
1427                 [DSO__ORIG_JAVA_JIT] = 'j',
1428                 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1429                 [DSO__ORIG_FEDORA] =   'f',
1430                 [DSO__ORIG_UBUNTU] =   'u',
1431                 [DSO__ORIG_BUILDID] =  'b',
1432                 [DSO__ORIG_DSO] =      'd',
1433                 [DSO__ORIG_KMODULE] =  'K',
1434                 [DSO__ORIG_GUEST_KERNEL] =  'g',
1435                 [DSO__ORIG_GUEST_KMODULE] =  'G',
1436         };
1437
1438         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1439                 return '!';
1440         return origin[self->origin];
1441 }
1442
1443 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1444 {
1445         int size = PATH_MAX;
1446         char *name;
1447         int ret = -1;
1448         int fd;
1449         struct machine *machine;
1450         const char *root_dir;
1451         int want_symtab;
1452
1453         dso__set_loaded(self, map->type);
1454
1455         if (self->kernel == DSO_TYPE_KERNEL)
1456                 return dso__load_kernel_sym(self, map, filter);
1457         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1458                 return dso__load_guest_kernel_sym(self, map, filter);
1459
1460         if (map->groups && map->groups->machine)
1461                 machine = map->groups->machine;
1462         else
1463                 machine = NULL;
1464
1465         name = malloc(size);
1466         if (!name)
1467                 return -1;
1468
1469         self->adjust_symbols = 0;
1470
1471         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1472                 ret = dso__load_perf_map(self, map, filter);
1473                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1474                                          DSO__ORIG_NOT_FOUND;
1475                 return ret;
1476         }
1477
1478         /* Iterate over candidate debug images.
1479          * On the first pass, only load images if they have a full symtab.
1480          * Failing that, do a second pass where we accept .dynsym also
1481          */
1482         for (self->origin = DSO__ORIG_BUILD_ID_CACHE, want_symtab = 1;
1483              self->origin != DSO__ORIG_NOT_FOUND;
1484              self->origin++) {
1485                 switch (self->origin) {
1486                 case DSO__ORIG_BUILD_ID_CACHE:
1487                         /* skip the locally configured cache if a symfs is given */
1488                         if (symbol_conf.symfs[0] ||
1489                             (dso__build_id_filename(self, name, size) == NULL)) {
1490                                 continue;
1491                         }
1492                         break;
1493                 case DSO__ORIG_FEDORA:
1494                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1495                                  symbol_conf.symfs, self->long_name);
1496                         break;
1497                 case DSO__ORIG_UBUNTU:
1498                         snprintf(name, size, "%s/usr/lib/debug%s",
1499                                  symbol_conf.symfs, self->long_name);
1500                         break;
1501                 case DSO__ORIG_BUILDID: {
1502                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1503
1504                         if (!self->has_build_id)
1505                                 continue;
1506
1507                         build_id__sprintf(self->build_id,
1508                                           sizeof(self->build_id),
1509                                           build_id_hex);
1510                         snprintf(name, size,
1511                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1512                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1513                         }
1514                         break;
1515                 case DSO__ORIG_DSO:
1516                         snprintf(name, size, "%s%s",
1517                              symbol_conf.symfs, self->long_name);
1518                         break;
1519                 case DSO__ORIG_GUEST_KMODULE:
1520                         if (map->groups && map->groups->machine)
1521                                 root_dir = map->groups->machine->root_dir;
1522                         else
1523                                 root_dir = "";
1524                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1525                                  root_dir, self->long_name);
1526                         break;
1527
1528                 case DSO__ORIG_KMODULE:
1529                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1530                                  self->long_name);
1531                         break;
1532
1533                 default:
1534                         /*
1535                          * If we wanted a full symtab but no image had one,
1536                          * relax our requirements and repeat the search.
1537                          */
1538                         if (want_symtab) {
1539                                 want_symtab = 0;
1540                                 self->origin = DSO__ORIG_BUILD_ID_CACHE;
1541                         } else
1542                                 continue;
1543                 }
1544
1545                 /* Name is now the name of the next image to try */
1546                 fd = open(name, O_RDONLY);
1547                 if (fd < 0)
1548                         continue;
1549
1550                 ret = dso__load_sym(self, map, name, fd, filter, 0,
1551                                     want_symtab);
1552                 close(fd);
1553
1554                 /*
1555                  * Some people seem to have debuginfo files _WITHOUT_ debug
1556                  * info!?!?
1557                  */
1558                 if (!ret)
1559                         continue;
1560
1561                 if (ret > 0) {
1562                         int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1563                         if (nr_plt > 0)
1564                                 ret += nr_plt;
1565                         break;
1566                 }
1567         }
1568
1569         free(name);
1570         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1571                 return 0;
1572         return ret;
1573 }
1574
1575 struct map *map_groups__find_by_name(struct map_groups *self,
1576                                      enum map_type type, const char *name)
1577 {
1578         struct rb_node *nd;
1579
1580         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1581                 struct map *map = rb_entry(nd, struct map, rb_node);
1582
1583                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1584                         return map;
1585         }
1586
1587         return NULL;
1588 }
1589
1590 static int dso__kernel_module_get_build_id(struct dso *self,
1591                                 const char *root_dir)
1592 {
1593         char filename[PATH_MAX];
1594         /*
1595          * kernel module short names are of the form "[module]" and
1596          * we need just "module" here.
1597          */
1598         const char *name = self->short_name + 1;
1599
1600         snprintf(filename, sizeof(filename),
1601                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1602                  root_dir, (int)strlen(name) - 1, name);
1603
1604         if (sysfs__read_build_id(filename, self->build_id,
1605                                  sizeof(self->build_id)) == 0)
1606                 self->has_build_id = true;
1607
1608         return 0;
1609 }
1610
1611 static int map_groups__set_modules_path_dir(struct map_groups *self,
1612                                 const char *dir_name)
1613 {
1614         struct dirent *dent;
1615         DIR *dir = opendir(dir_name);
1616         int ret = 0;
1617
1618         if (!dir) {
1619                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1620                 return -1;
1621         }
1622
1623         while ((dent = readdir(dir)) != NULL) {
1624                 char path[PATH_MAX];
1625                 struct stat st;
1626
1627                 /*sshfs might return bad dent->d_type, so we have to stat*/
1628                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1629                 if (stat(path, &st))
1630                         continue;
1631
1632                 if (S_ISDIR(st.st_mode)) {
1633                         if (!strcmp(dent->d_name, ".") ||
1634                             !strcmp(dent->d_name, ".."))
1635                                 continue;
1636
1637                         snprintf(path, sizeof(path), "%s/%s",
1638                                  dir_name, dent->d_name);
1639                         ret = map_groups__set_modules_path_dir(self, path);
1640                         if (ret < 0)
1641                                 goto out;
1642                 } else {
1643                         char *dot = strrchr(dent->d_name, '.'),
1644                              dso_name[PATH_MAX];
1645                         struct map *map;
1646                         char *long_name;
1647
1648                         if (dot == NULL || strcmp(dot, ".ko"))
1649                                 continue;
1650                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1651                                  (int)(dot - dent->d_name), dent->d_name);
1652
1653                         strxfrchar(dso_name, '-', '_');
1654                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1655                         if (map == NULL)
1656                                 continue;
1657
1658                         snprintf(path, sizeof(path), "%s/%s",
1659                                  dir_name, dent->d_name);
1660
1661                         long_name = strdup(path);
1662                         if (long_name == NULL) {
1663                                 ret = -1;
1664                                 goto out;
1665                         }
1666                         dso__set_long_name(map->dso, long_name);
1667                         map->dso->lname_alloc = 1;
1668                         dso__kernel_module_get_build_id(map->dso, "");
1669                 }
1670         }
1671
1672 out:
1673         closedir(dir);
1674         return ret;
1675 }
1676
1677 static char *get_kernel_version(const char *root_dir)
1678 {
1679         char version[PATH_MAX];
1680         FILE *file;
1681         char *name, *tmp;
1682         const char *prefix = "Linux version ";
1683
1684         sprintf(version, "%s/proc/version", root_dir);
1685         file = fopen(version, "r");
1686         if (!file)
1687                 return NULL;
1688
1689         version[0] = '\0';
1690         tmp = fgets(version, sizeof(version), file);
1691         fclose(file);
1692
1693         name = strstr(version, prefix);
1694         if (!name)
1695                 return NULL;
1696         name += strlen(prefix);
1697         tmp = strchr(name, ' ');
1698         if (tmp)
1699                 *tmp = '\0';
1700
1701         return strdup(name);
1702 }
1703
1704 static int machine__set_modules_path(struct machine *self)
1705 {
1706         char *version;
1707         char modules_path[PATH_MAX];
1708
1709         version = get_kernel_version(self->root_dir);
1710         if (!version)
1711                 return -1;
1712
1713         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1714                  self->root_dir, version);
1715         free(version);
1716
1717         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1718 }
1719
1720 /*
1721  * Constructor variant for modules (where we know from /proc/modules where
1722  * they are loaded) and for vmlinux, where only after we load all the
1723  * symbols we'll know where it starts and ends.
1724  */
1725 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1726 {
1727         struct map *self = calloc(1, (sizeof(*self) +
1728                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1729         if (self != NULL) {
1730                 /*
1731                  * ->end will be filled after we load all the symbols
1732                  */
1733                 map__init(self, type, start, 0, 0, dso);
1734         }
1735
1736         return self;
1737 }
1738
1739 struct map *machine__new_module(struct machine *self, u64 start,
1740                                 const char *filename)
1741 {
1742         struct map *map;
1743         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1744
1745         if (dso == NULL)
1746                 return NULL;
1747
1748         map = map__new2(start, dso, MAP__FUNCTION);
1749         if (map == NULL)
1750                 return NULL;
1751
1752         if (machine__is_host(self))
1753                 dso->origin = DSO__ORIG_KMODULE;
1754         else
1755                 dso->origin = DSO__ORIG_GUEST_KMODULE;
1756         map_groups__insert(&self->kmaps, map);
1757         return map;
1758 }
1759
1760 static int machine__create_modules(struct machine *self)
1761 {
1762         char *line = NULL;
1763         size_t n;
1764         FILE *file;
1765         struct map *map;
1766         const char *modules;
1767         char path[PATH_MAX];
1768
1769         if (machine__is_default_guest(self))
1770                 modules = symbol_conf.default_guest_modules;
1771         else {
1772                 sprintf(path, "%s/proc/modules", self->root_dir);
1773                 modules = path;
1774         }
1775
1776         file = fopen(modules, "r");
1777         if (file == NULL)
1778                 return -1;
1779
1780         while (!feof(file)) {
1781                 char name[PATH_MAX];
1782                 u64 start;
1783                 char *sep;
1784                 int line_len;
1785
1786                 line_len = getline(&line, &n, file);
1787                 if (line_len < 0)
1788                         break;
1789
1790                 if (!line)
1791                         goto out_failure;
1792
1793                 line[--line_len] = '\0'; /* \n */
1794
1795                 sep = strrchr(line, 'x');
1796                 if (sep == NULL)
1797                         continue;
1798
1799                 hex2u64(sep + 1, &start);
1800
1801                 sep = strchr(line, ' ');
1802                 if (sep == NULL)
1803                         continue;
1804
1805                 *sep = '\0';
1806
1807                 snprintf(name, sizeof(name), "[%s]", line);
1808                 map = machine__new_module(self, start, name);
1809                 if (map == NULL)
1810                         goto out_delete_line;
1811                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1812         }
1813
1814         free(line);
1815         fclose(file);
1816
1817         return machine__set_modules_path(self);
1818
1819 out_delete_line:
1820         free(line);
1821 out_failure:
1822         return -1;
1823 }
1824
1825 int dso__load_vmlinux(struct dso *self, struct map *map,
1826                       const char *vmlinux, symbol_filter_t filter)
1827 {
1828         int err = -1, fd;
1829         char symfs_vmlinux[PATH_MAX];
1830
1831         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
1832                  symbol_conf.symfs, vmlinux);
1833         fd = open(symfs_vmlinux, O_RDONLY);
1834         if (fd < 0)
1835                 return -1;
1836
1837         dso__set_loaded(self, map->type);
1838         err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
1839         close(fd);
1840
1841         if (err > 0)
1842                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1843
1844         return err;
1845 }
1846
1847 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1848                            symbol_filter_t filter)
1849 {
1850         int i, err = 0;
1851         char *filename;
1852
1853         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1854                  vmlinux_path__nr_entries + 1);
1855
1856         filename = dso__build_id_filename(self, NULL, 0);
1857         if (filename != NULL) {
1858                 err = dso__load_vmlinux(self, map, filename, filter);
1859                 if (err > 0) {
1860                         dso__set_long_name(self, filename);
1861                         goto out;
1862                 }
1863                 free(filename);
1864         }
1865
1866         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1867                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1868                 if (err > 0) {
1869                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1870                         break;
1871                 }
1872         }
1873 out:
1874         return err;
1875 }
1876
1877 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1878                                 symbol_filter_t filter)
1879 {
1880         int err;
1881         const char *kallsyms_filename = NULL;
1882         char *kallsyms_allocated_filename = NULL;
1883         /*
1884          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1885          * it and only it, reporting errors to the user if it cannot be used.
1886          *
1887          * For instance, try to analyse an ARM perf.data file _without_ a
1888          * build-id, or if the user specifies the wrong path to the right
1889          * vmlinux file, obviously we can't fallback to another vmlinux (a
1890          * x86_86 one, on the machine where analysis is being performed, say),
1891          * or worse, /proc/kallsyms.
1892          *
1893          * If the specified file _has_ a build-id and there is a build-id
1894          * section in the perf.data file, we will still do the expected
1895          * validation in dso__load_vmlinux and will bail out if they don't
1896          * match.
1897          */
1898         if (symbol_conf.kallsyms_name != NULL) {
1899                 kallsyms_filename = symbol_conf.kallsyms_name;
1900                 goto do_kallsyms;
1901         }
1902
1903         if (symbol_conf.vmlinux_name != NULL) {
1904                 err = dso__load_vmlinux(self, map,
1905                                         symbol_conf.vmlinux_name, filter);
1906                 if (err > 0) {
1907                         dso__set_long_name(self,
1908                                            strdup(symbol_conf.vmlinux_name));
1909                         goto out_fixup;
1910                 }
1911                 return err;
1912         }
1913
1914         if (vmlinux_path != NULL) {
1915                 err = dso__load_vmlinux_path(self, map, filter);
1916                 if (err > 0)
1917                         goto out_fixup;
1918         }
1919
1920         /* do not try local files if a symfs was given */
1921         if (symbol_conf.symfs[0] != 0)
1922                 return -1;
1923
1924         /*
1925          * Say the kernel DSO was created when processing the build-id header table,
1926          * we have a build-id, so check if it is the same as the running kernel,
1927          * using it if it is.
1928          */
1929         if (self->has_build_id) {
1930                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1931                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1932
1933                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1934                                          sizeof(kallsyms_build_id)) == 0) {
1935                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1936                                 kallsyms_filename = "/proc/kallsyms";
1937                                 goto do_kallsyms;
1938                         }
1939                 }
1940                 /*
1941                  * Now look if we have it on the build-id cache in
1942                  * $HOME/.debug/[kernel.kallsyms].
1943                  */
1944                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1945                                   sbuild_id);
1946
1947                 if (asprintf(&kallsyms_allocated_filename,
1948                              "%s/.debug/[kernel.kallsyms]/%s",
1949                              getenv("HOME"), sbuild_id) == -1) {
1950                         pr_err("Not enough memory for kallsyms file lookup\n");
1951                         return -1;
1952                 }
1953
1954                 kallsyms_filename = kallsyms_allocated_filename;
1955
1956                 if (access(kallsyms_filename, F_OK)) {
1957                         pr_err("No kallsyms or vmlinux with build-id %s "
1958                                "was found\n", sbuild_id);
1959                         free(kallsyms_allocated_filename);
1960                         return -1;
1961                 }
1962         } else {
1963                 /*
1964                  * Last resort, if we don't have a build-id and couldn't find
1965                  * any vmlinux file, try the running kernel kallsyms table.
1966                  */
1967                 kallsyms_filename = "/proc/kallsyms";
1968         }
1969
1970 do_kallsyms:
1971         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1972         if (err > 0)
1973                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1974         free(kallsyms_allocated_filename);
1975
1976         if (err > 0) {
1977 out_fixup:
1978                 if (kallsyms_filename != NULL)
1979                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1980                 map__fixup_start(map);
1981                 map__fixup_end(map);
1982         }
1983
1984         return err;
1985 }
1986
1987 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1988                                 symbol_filter_t filter)
1989 {
1990         int err;
1991         const char *kallsyms_filename = NULL;
1992         struct machine *machine;
1993         char path[PATH_MAX];
1994
1995         if (!map->groups) {
1996                 pr_debug("Guest kernel map hasn't the point to groups\n");
1997                 return -1;
1998         }
1999         machine = map->groups->machine;
2000
2001         if (machine__is_default_guest(machine)) {
2002                 /*
2003                  * if the user specified a vmlinux filename, use it and only
2004                  * it, reporting errors to the user if it cannot be used.
2005                  * Or use file guest_kallsyms inputted by user on commandline
2006                  */
2007                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2008                         err = dso__load_vmlinux(self, map,
2009                                 symbol_conf.default_guest_vmlinux_name, filter);
2010                         goto out_try_fixup;
2011                 }
2012
2013                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2014                 if (!kallsyms_filename)
2015                         return -1;
2016         } else {
2017                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2018                 kallsyms_filename = path;
2019         }
2020
2021         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
2022         if (err > 0)
2023                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2024
2025 out_try_fixup:
2026         if (err > 0) {
2027                 if (kallsyms_filename != NULL) {
2028                         machine__mmap_name(machine, path, sizeof(path));
2029                         dso__set_long_name(self, strdup(path));
2030                 }
2031                 map__fixup_start(map);
2032                 map__fixup_end(map);
2033         }
2034
2035         return err;
2036 }
2037
2038 static void dsos__add(struct list_head *head, struct dso *dso)
2039 {
2040         list_add_tail(&dso->node, head);
2041 }
2042
2043 static struct dso *dsos__find(struct list_head *head, const char *name)
2044 {
2045         struct dso *pos;
2046
2047         list_for_each_entry(pos, head, node)
2048                 if (strcmp(pos->long_name, name) == 0)
2049                         return pos;
2050         return NULL;
2051 }
2052
2053 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2054 {
2055         struct dso *dso = dsos__find(head, name);
2056
2057         if (!dso) {
2058                 dso = dso__new(name);
2059                 if (dso != NULL) {
2060                         dsos__add(head, dso);
2061                         dso__set_basename(dso);
2062                 }
2063         }
2064
2065         return dso;
2066 }
2067
2068 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2069 {
2070         struct dso *pos;
2071         size_t ret = 0;
2072
2073         list_for_each_entry(pos, head, node) {
2074                 int i;
2075                 for (i = 0; i < MAP__NR_TYPES; ++i)
2076                         ret += dso__fprintf(pos, i, fp);
2077         }
2078
2079         return ret;
2080 }
2081
2082 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2083 {
2084         struct rb_node *nd;
2085         size_t ret = 0;
2086
2087         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2088                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2089                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2090                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2091         }
2092
2093         return ret;
2094 }
2095
2096 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2097                                       bool with_hits)
2098 {
2099         struct dso *pos;
2100         size_t ret = 0;
2101
2102         list_for_each_entry(pos, head, node) {
2103                 if (with_hits && !pos->hit)
2104                         continue;
2105                 ret += dso__fprintf_buildid(pos, fp);
2106                 ret += fprintf(fp, " %s\n", pos->long_name);
2107         }
2108         return ret;
2109 }
2110
2111 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2112 {
2113         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2114                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2115 }
2116
2117 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2118 {
2119         struct rb_node *nd;
2120         size_t ret = 0;
2121
2122         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2123                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2124                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2125         }
2126         return ret;
2127 }
2128
2129 struct dso *dso__new_kernel(const char *name)
2130 {
2131         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2132
2133         if (self != NULL) {
2134                 dso__set_short_name(self, "[kernel]");
2135                 self->kernel = DSO_TYPE_KERNEL;
2136         }
2137
2138         return self;
2139 }
2140
2141 static struct dso *dso__new_guest_kernel(struct machine *machine,
2142                                         const char *name)
2143 {
2144         char bf[PATH_MAX];
2145         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2146
2147         if (self != NULL) {
2148                 dso__set_short_name(self, "[guest.kernel]");
2149                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2150         }
2151
2152         return self;
2153 }
2154
2155 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2156 {
2157         char path[PATH_MAX];
2158
2159         if (machine__is_default_guest(machine))
2160                 return;
2161         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2162         if (sysfs__read_build_id(path, self->build_id,
2163                                  sizeof(self->build_id)) == 0)
2164                 self->has_build_id = true;
2165 }
2166
2167 static struct dso *machine__create_kernel(struct machine *self)
2168 {
2169         const char *vmlinux_name = NULL;
2170         struct dso *kernel;
2171
2172         if (machine__is_host(self)) {
2173                 vmlinux_name = symbol_conf.vmlinux_name;
2174                 kernel = dso__new_kernel(vmlinux_name);
2175         } else {
2176                 if (machine__is_default_guest(self))
2177                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2178                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2179         }
2180
2181         if (kernel != NULL) {
2182                 dso__read_running_kernel_build_id(kernel, self);
2183                 dsos__add(&self->kernel_dsos, kernel);
2184         }
2185         return kernel;
2186 }
2187
2188 struct process_args {
2189         u64 start;
2190 };
2191
2192 static int symbol__in_kernel(void *arg, const char *name,
2193                              char type __used, u64 start, u64 end __used)
2194 {
2195         struct process_args *args = arg;
2196
2197         if (strchr(name, '['))
2198                 return 0;
2199
2200         args->start = start;
2201         return 1;
2202 }
2203
2204 /* Figure out the start address of kernel map from /proc/kallsyms */
2205 static u64 machine__get_kernel_start_addr(struct machine *machine)
2206 {
2207         const char *filename;
2208         char path[PATH_MAX];
2209         struct process_args args;
2210
2211         if (machine__is_host(machine)) {
2212                 filename = "/proc/kallsyms";
2213         } else {
2214                 if (machine__is_default_guest(machine))
2215                         filename = (char *)symbol_conf.default_guest_kallsyms;
2216                 else {
2217                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2218                         filename = path;
2219                 }
2220         }
2221
2222         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2223                 return 0;
2224
2225         return args.start;
2226 }
2227
2228 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2229 {
2230         enum map_type type;
2231         u64 start = machine__get_kernel_start_addr(self);
2232
2233         for (type = 0; type < MAP__NR_TYPES; ++type) {
2234                 struct kmap *kmap;
2235
2236                 self->vmlinux_maps[type] = map__new2(start, kernel, type);
2237                 if (self->vmlinux_maps[type] == NULL)
2238                         return -1;
2239
2240                 self->vmlinux_maps[type]->map_ip =
2241                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2242
2243                 kmap = map__kmap(self->vmlinux_maps[type]);
2244                 kmap->kmaps = &self->kmaps;
2245                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2246         }
2247
2248         return 0;
2249 }
2250
2251 void machine__destroy_kernel_maps(struct machine *self)
2252 {
2253         enum map_type type;
2254
2255         for (type = 0; type < MAP__NR_TYPES; ++type) {
2256                 struct kmap *kmap;
2257
2258                 if (self->vmlinux_maps[type] == NULL)
2259                         continue;
2260
2261                 kmap = map__kmap(self->vmlinux_maps[type]);
2262                 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2263                 if (kmap->ref_reloc_sym) {
2264                         /*
2265                          * ref_reloc_sym is shared among all maps, so free just
2266                          * on one of them.
2267                          */
2268                         if (type == MAP__FUNCTION) {
2269                                 free((char *)kmap->ref_reloc_sym->name);
2270                                 kmap->ref_reloc_sym->name = NULL;
2271                                 free(kmap->ref_reloc_sym);
2272                         }
2273                         kmap->ref_reloc_sym = NULL;
2274                 }
2275
2276                 map__delete(self->vmlinux_maps[type]);
2277                 self->vmlinux_maps[type] = NULL;
2278         }
2279 }
2280
2281 int machine__create_kernel_maps(struct machine *self)
2282 {
2283         struct dso *kernel = machine__create_kernel(self);
2284
2285         if (kernel == NULL ||
2286             __machine__create_kernel_maps(self, kernel) < 0)
2287                 return -1;
2288
2289         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2290                 pr_debug("Problems creating module maps, continuing anyway...\n");
2291         /*
2292          * Now that we have all the maps created, just set the ->end of them:
2293          */
2294         map_groups__fixup_end(&self->kmaps);
2295         return 0;
2296 }
2297
2298 static void vmlinux_path__exit(void)
2299 {
2300         while (--vmlinux_path__nr_entries >= 0) {
2301                 free(vmlinux_path[vmlinux_path__nr_entries]);
2302                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2303         }
2304
2305         free(vmlinux_path);
2306         vmlinux_path = NULL;
2307 }
2308
2309 static int vmlinux_path__init(void)
2310 {
2311         struct utsname uts;
2312         char bf[PATH_MAX];
2313
2314         vmlinux_path = malloc(sizeof(char *) * 5);
2315         if (vmlinux_path == NULL)
2316                 return -1;
2317
2318         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2319         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2320                 goto out_fail;
2321         ++vmlinux_path__nr_entries;
2322         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2323         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2324                 goto out_fail;
2325         ++vmlinux_path__nr_entries;
2326
2327         /* only try running kernel version if no symfs was given */
2328         if (symbol_conf.symfs[0] != 0)
2329                 return 0;
2330
2331         if (uname(&uts) < 0)
2332                 return -1;
2333
2334         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2335         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2336         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2337                 goto out_fail;
2338         ++vmlinux_path__nr_entries;
2339         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2340         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2341         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2342                 goto out_fail;
2343         ++vmlinux_path__nr_entries;
2344         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2345                  uts.release);
2346         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2347         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2348                 goto out_fail;
2349         ++vmlinux_path__nr_entries;
2350
2351         return 0;
2352
2353 out_fail:
2354         vmlinux_path__exit();
2355         return -1;
2356 }
2357
2358 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2359 {
2360         int i;
2361         size_t printed = 0;
2362         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2363
2364         if (kdso->has_build_id) {
2365                 char filename[PATH_MAX];
2366                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2367                         printed += fprintf(fp, "[0] %s\n", filename);
2368         }
2369
2370         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2371                 printed += fprintf(fp, "[%d] %s\n",
2372                                    i + kdso->has_build_id, vmlinux_path[i]);
2373
2374         return printed;
2375 }
2376
2377 static int setup_list(struct strlist **list, const char *list_str,
2378                       const char *list_name)
2379 {
2380         if (list_str == NULL)
2381                 return 0;
2382
2383         *list = strlist__new(true, list_str);
2384         if (!*list) {
2385                 pr_err("problems parsing %s list\n", list_name);
2386                 return -1;
2387         }
2388         return 0;
2389 }
2390
2391 int symbol__init(void)
2392 {
2393         const char *symfs;
2394
2395         if (symbol_conf.initialized)
2396                 return 0;
2397
2398         elf_version(EV_CURRENT);
2399         if (symbol_conf.sort_by_name)
2400                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2401                                           sizeof(struct symbol));
2402
2403         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2404                 return -1;
2405
2406         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2407                 pr_err("'.' is the only non valid --field-separator argument\n");
2408                 return -1;
2409         }
2410
2411         if (setup_list(&symbol_conf.dso_list,
2412                        symbol_conf.dso_list_str, "dso") < 0)
2413                 return -1;
2414
2415         if (setup_list(&symbol_conf.comm_list,
2416                        symbol_conf.comm_list_str, "comm") < 0)
2417                 goto out_free_dso_list;
2418
2419         if (setup_list(&symbol_conf.sym_list,
2420                        symbol_conf.sym_list_str, "symbol") < 0)
2421                 goto out_free_comm_list;
2422
2423         /*
2424          * A path to symbols of "/" is identical to ""
2425          * reset here for simplicity.
2426          */
2427         symfs = realpath(symbol_conf.symfs, NULL);
2428         if (symfs == NULL)
2429                 symfs = symbol_conf.symfs;
2430         if (strcmp(symfs, "/") == 0)
2431                 symbol_conf.symfs = "";
2432         if (symfs != symbol_conf.symfs)
2433                 free((void *)symfs);
2434
2435         symbol_conf.initialized = true;
2436         return 0;
2437
2438 out_free_dso_list:
2439         strlist__delete(symbol_conf.dso_list);
2440 out_free_comm_list:
2441         strlist__delete(symbol_conf.comm_list);
2442         return -1;
2443 }
2444
2445 void symbol__exit(void)
2446 {
2447         if (!symbol_conf.initialized)
2448                 return;
2449         strlist__delete(symbol_conf.sym_list);
2450         strlist__delete(symbol_conf.dso_list);
2451         strlist__delete(symbol_conf.comm_list);
2452         vmlinux_path__exit();
2453         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2454         symbol_conf.initialized = false;
2455 }
2456
2457 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2458 {
2459         struct machine *machine = machines__findnew(self, pid);
2460
2461         if (machine == NULL)
2462                 return -1;
2463
2464         return machine__create_kernel_maps(machine);
2465 }
2466
2467 static int hex(char ch)
2468 {
2469         if ((ch >= '0') && (ch <= '9'))
2470                 return ch - '0';
2471         if ((ch >= 'a') && (ch <= 'f'))
2472                 return ch - 'a' + 10;
2473         if ((ch >= 'A') && (ch <= 'F'))
2474                 return ch - 'A' + 10;
2475         return -1;
2476 }
2477
2478 /*
2479  * While we find nice hex chars, build a long_val.
2480  * Return number of chars processed.
2481  */
2482 int hex2u64(const char *ptr, u64 *long_val)
2483 {
2484         const char *p = ptr;
2485         *long_val = 0;
2486
2487         while (*p) {
2488                 const int hex_val = hex(*p);
2489
2490                 if (hex_val < 0)
2491                         break;
2492
2493                 *long_val = (*long_val << 4) | hex_val;
2494                 p++;
2495         }
2496
2497         return p - ptr;
2498 }
2499
2500 char *strxfrchar(char *s, char from, char to)
2501 {
2502         char *p = s;
2503
2504         while ((p = strchr(p, from)) != NULL)
2505                 *p++ = to;
2506
2507         return s;
2508 }
2509
2510 int machines__create_guest_kernel_maps(struct rb_root *self)
2511 {
2512         int ret = 0;
2513         struct dirent **namelist = NULL;
2514         int i, items = 0;
2515         char path[PATH_MAX];
2516         pid_t pid;
2517
2518         if (symbol_conf.default_guest_vmlinux_name ||
2519             symbol_conf.default_guest_modules ||
2520             symbol_conf.default_guest_kallsyms) {
2521                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2522         }
2523
2524         if (symbol_conf.guestmount) {
2525                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2526                 if (items <= 0)
2527                         return -ENOENT;
2528                 for (i = 0; i < items; i++) {
2529                         if (!isdigit(namelist[i]->d_name[0])) {
2530                                 /* Filter out . and .. */
2531                                 continue;
2532                         }
2533                         pid = atoi(namelist[i]->d_name);
2534                         sprintf(path, "%s/%s/proc/kallsyms",
2535                                 symbol_conf.guestmount,
2536                                 namelist[i]->d_name);
2537                         ret = access(path, R_OK);
2538                         if (ret) {
2539                                 pr_debug("Can't access file %s\n", path);
2540                                 goto failure;
2541                         }
2542                         machines__create_kernel_maps(self, pid);
2543                 }
2544 failure:
2545                 free(namelist);
2546         }
2547
2548         return ret;
2549 }
2550
2551 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2552 {
2553         struct rb_node *next = rb_first(self);
2554
2555         while (next) {
2556                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2557
2558                 next = rb_next(&pos->rb_node);
2559                 rb_erase(&pos->rb_node, self);
2560                 machine__delete(pos);
2561         }
2562 }
2563
2564 int machine__load_kallsyms(struct machine *self, const char *filename,
2565                            enum map_type type, symbol_filter_t filter)
2566 {
2567         struct map *map = self->vmlinux_maps[type];
2568         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2569
2570         if (ret > 0) {
2571                 dso__set_loaded(map->dso, type);
2572                 /*
2573                  * Since /proc/kallsyms will have multiple sessions for the
2574                  * kernel, with modules between them, fixup the end of all
2575                  * sections.
2576                  */
2577                 __map_groups__fixup_end(&self->kmaps, type);
2578         }
2579
2580         return ret;
2581 }
2582
2583 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2584                                symbol_filter_t filter)
2585 {
2586         struct map *map = self->vmlinux_maps[type];
2587         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2588
2589         if (ret > 0) {
2590                 dso__set_loaded(map->dso, type);
2591                 map__reloc_vmlinux(map);
2592         }
2593
2594         return ret;
2595 }