SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 "symbol.h"
  15 #include "strlist.h"
  16
  17 #include <libelf.h>
  18 #include <gelf.h>
  19 #include <elf.h>
  20 #include <limits.h>
  21 #include <sys/utsname.h>
  22
  23 #ifndef NT_GNU_BUILD_ID
  24 #define NT_GNU_BUILD_ID 3
  25 #endif
  26
  27 static void dsos__add(struct list_head *head, struct dso *dso);
  28 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
  29 static int dso__load_kernel_sym(struct dso *self, struct map *map,
  30                                 symbol_filter_t filter);
  31 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
  32                         symbol_filter_t filter);
  33 static int vmlinux_path__nr_entries;
  34 static char **vmlinux_path;
  35
  36 struct symbol_conf symbol_conf = {
  37         .exclude_other    = true,
  38         .use_modules      = true,
  39         .try_vmlinux_path = true,
  40 };
  41
  42 bool dso__loaded(const struct dso *self, enum map_type type)
  43 {
  44         return self->loaded & (1 << type);
  45 }
  46
  47 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
  48 {
  49         return self->sorted_by_name & (1 << type);
  50 }
  51
  52 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
  53 {
  54         self->sorted_by_name |= (1 << type);
  55 }
  56
  57 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  58 {
  59         switch (map_type) {
  60         case MAP__FUNCTION:
  61                 return symbol_type == 'T' || symbol_type == 'W';
  62         case MAP__VARIABLE:
  63                 return symbol_type == 'D' || symbol_type == 'd';
  64         default:
  65                 return false;
  66         }
  67 }
  68
  69 static void symbols__fixup_end(struct rb_root *self)
  70 {
  71         struct rb_node *nd, *prevnd = rb_first(self);
  72         struct symbol *curr, *prev;
  73
  74         if (prevnd == NULL)
  75                 return;
  76
  77         curr = rb_entry(prevnd, struct symbol, rb_node);
  78
  79         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
  80                 prev = curr;
  81                 curr = rb_entry(nd, struct symbol, rb_node);
  82
  83                 if (prev->end == prev->start)
  84                         prev->end = curr->start - 1;
  85         }
  86
  87         /* Last entry */
  88         if (curr->end == curr->start)
  89                 curr->end = roundup(curr->start, 4096);
  90 }
  91
  92 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
  93 {
  94         struct map *prev, *curr;
  95         struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
  96
  97         if (prevnd == NULL)
  98                 return;
  99
 100         curr = rb_entry(prevnd, struct map, rb_node);
 101
 102         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 103                 prev = curr;
 104                 curr = rb_entry(nd, struct map, rb_node);
 105                 prev->end = curr->start - 1;
 106         }
 107
 108         /*
 109          * We still haven't the actual symbols, so guess the
 110          * last map final address.
 111          */
 112         curr->end = ~0UL;
 113 }
 114
 115 static void map_groups__fixup_end(struct map_groups *self)
 116 {
 117         int i;
 118         for (i = 0; i < MAP__NR_TYPES; ++i)
 119                 __map_groups__fixup_end(self, i);
 120 }
 121
 122 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
 123 {
 124         size_t namelen = strlen(name) + 1;
 125         struct symbol *self = calloc(1, (symbol_conf.priv_size +
 126                                          sizeof(*self) + namelen));
 127         if (self == NULL)
 128                 return NULL;
 129
 130         if (symbol_conf.priv_size)
 131                 self = ((void *)self) + symbol_conf.priv_size;
 132
 133         self->start = start;
 134         self->end   = len ? start + len - 1 : start;
 135
 136         pr_debug4("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
 137
 138         memcpy(self->name, name, namelen);
 139
 140         return self;
 141 }
 142
 143 void symbol__delete(struct symbol *self)
 144 {
 145         free(((void *)self) - symbol_conf.priv_size);
 146 }
 147
 148 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 149 {
 150         return fprintf(fp, " %llx-%llx %s\n",
 151                        self->start, self->end, self->name);
 152 }
 153
 154 void dso__set_long_name(struct dso *self, char *name)
 155 {
 156         if (name == NULL)
 157                 return;
 158         self->long_name = name;
 159         self->long_name_len = strlen(name);
 160 }
 161
 162 static void dso__set_short_name(struct dso *self, const char *name)
 163 {
 164         if (name == NULL)
 165                 return;
 166         self->short_name = name;
 167         self->short_name_len = strlen(name);
 168 }
 169
 170 static void dso__set_basename(struct dso *self)
 171 {
 172         dso__set_short_name(self, basename(self->long_name));
 173 }
 174
 175 struct dso *dso__new(const char *name)
 176 {
 177         struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
 178
 179         if (self != NULL) {
 180                 int i;
 181                 strcpy(self->name, name);
 182                 dso__set_long_name(self, self->name);
 183                 dso__set_short_name(self, self->name);
 184                 for (i = 0; i < MAP__NR_TYPES; ++i)
 185                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
 186                 self->slen_calculated = 0;
 187                 self->origin = DSO__ORIG_NOT_FOUND;
 188                 self->loaded = 0;
 189                 self->sorted_by_name = 0;
 190                 self->has_build_id = 0;
 191                 self->kernel = DSO_TYPE_USER;
 192                 INIT_LIST_HEAD(&self->node);
 193         }
 194
 195         return self;
 196 }
 197
 198 static void symbols__delete(struct rb_root *self)
 199 {
 200         struct symbol *pos;
 201         struct rb_node *next = rb_first(self);
 202
 203         while (next) {
 204                 pos = rb_entry(next, struct symbol, rb_node);
 205                 next = rb_next(&pos->rb_node);
 206                 rb_erase(&pos->rb_node, self);
 207                 symbol__delete(pos);
 208         }
 209 }
 210
 211 void dso__delete(struct dso *self)
 212 {
 213         int i;
 214         for (i = 0; i < MAP__NR_TYPES; ++i)
 215                 symbols__delete(&self->symbols[i]);
 216         if (self->long_name != self->name)
 217                 free(self->long_name);
 218         free(self);
 219 }
 220
 221 void dso__set_build_id(struct dso *self, void *build_id)
 222 {
 223         memcpy(self->build_id, build_id, sizeof(self->build_id));
 224         self->has_build_id = 1;
 225 }
 226
 227 static void symbols__insert(struct rb_root *self, struct symbol *sym)
 228 {
 229         struct rb_node **p = &self->rb_node;
 230         struct rb_node *parent = NULL;
 231         const u64 ip = sym->start;
 232         struct symbol *s;
 233
 234         while (*p != NULL) {
 235                 parent = *p;
 236                 s = rb_entry(parent, struct symbol, rb_node);
 237                 if (ip < s->start)
 238                         p = &(*p)->rb_left;
 239                 else
 240                         p = &(*p)->rb_right;
 241         }
 242         rb_link_node(&sym->rb_node, parent, p);
 243         rb_insert_color(&sym->rb_node, self);
 244 }
 245
 246 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
 247 {
 248         struct rb_node *n;
 249
 250         if (self == NULL)
 251                 return NULL;
 252
 253         n = self->rb_node;
 254
 255         while (n) {
 256                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 257
 258                 if (ip < s->start)
 259                         n = n->rb_left;
 260                 else if (ip > s->end)
 261                         n = n->rb_right;
 262                 else
 263                         return s;
 264         }
 265
 266         return NULL;
 267 }
 268
 269 struct symbol_name_rb_node {
 270         struct rb_node  rb_node;
 271         struct symbol   sym;
 272 };
 273
 274 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
 275 {
 276         struct rb_node **p = &self->rb_node;
 277         struct rb_node *parent = NULL;
 278         struct symbol_name_rb_node *symn = ((void *)sym) - sizeof(*parent), *s;
 279
 280         while (*p != NULL) {
 281                 parent = *p;
 282                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 283                 if (strcmp(sym->name, s->sym.name) < 0)
 284                         p = &(*p)->rb_left;
 285                 else
 286                         p = &(*p)->rb_right;
 287         }
 288         rb_link_node(&symn->rb_node, parent, p);
 289         rb_insert_color(&symn->rb_node, self);
 290 }
 291
 292 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
 293 {
 294         struct rb_node *nd;
 295
 296         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 297                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 298                 symbols__insert_by_name(self, pos);
 299         }
 300 }
 301
 302 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
 303 {
 304         struct rb_node *n;
 305
 306         if (self == NULL)
 307                 return NULL;
 308
 309         n = self->rb_node;
 310
 311         while (n) {
 312                 struct symbol_name_rb_node *s;
 313                 int cmp;
 314
 315                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 316                 cmp = strcmp(name, s->sym.name);
 317
 318                 if (cmp < 0)
 319                         n = n->rb_left;
 320                 else if (cmp > 0)
 321                         n = n->rb_right;
 322                 else
 323                         return &s->sym;
 324         }
 325
 326         return NULL;
 327 }
 328
 329 struct symbol *dso__find_symbol(struct dso *self,
 330                                 enum map_type type, u64 addr)
 331 {
 332         return symbols__find(&self->symbols[type], addr);
 333 }
 334
 335 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 336                                         const char *name)
 337 {
 338         return symbols__find_by_name(&self->symbol_names[type], name);
 339 }
 340
 341 void dso__sort_by_name(struct dso *self, enum map_type type)
 342 {
 343         dso__set_sorted_by_name(self, type);
 344         return symbols__sort_by_name(&self->symbol_names[type],
 345                                      &self->symbols[type]);
 346 }
 347
 348 int build_id__sprintf(const u8 *self, int len, char *bf)
 349 {
 350         char *bid = bf;
 351         const u8 *raw = self;
 352         int i;
 353
 354         for (i = 0; i < len; ++i) {
 355                 sprintf(bid, "%02x", *raw);
 356                 ++raw;
 357                 bid += 2;
 358         }
 359
 360         return raw - self;
 361 }
 362
 363 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
 364 {
 365         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 366
 367         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
 368         return fprintf(fp, "%s", sbuild_id);
 369 }
 370
 371 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
 372 {
 373         struct rb_node *nd;
 374         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
 375
 376         if (self->short_name != self->long_name)
 377                 ret += fprintf(fp, "%s, ", self->long_name);
 378         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
 379                        self->loaded ? "" : "NOT ");
 380         ret += dso__fprintf_buildid(self, fp);
 381         ret += fprintf(fp, ")\n");
 382         for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
 383                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 384                 ret += symbol__fprintf(pos, fp);
 385         }
 386
 387         return ret;
 388 }
 389
 390 int kallsyms__parse(const char *filename, void *arg,
 391                     int (*process_symbol)(void *arg, const char *name,
 392                                                      char type, u64 start))
 393 {
 394         char *line = NULL;
 395         size_t n;
 396         int err = 0;
 397         FILE *file = fopen(filename, "r");
 398
 399         if (file == NULL)
 400                 goto out_failure;
 401
 402         while (!feof(file)) {
 403                 u64 start;
 404                 int line_len, len;
 405                 char symbol_type;
 406                 char *symbol_name;
 407
 408                 line_len = getline(&line, &n, file);
 409                 if (line_len < 0 || !line)
 410                         break;
 411
 412                 line[--line_len] = '\0'; /* \n */
 413
 414                 len = hex2u64(line, &start);
 415
 416                 len++;
 417                 if (len + 2 >= line_len)
 418                         continue;
 419
 420                 symbol_type = toupper(line[len]);
 421                 symbol_name = line + len + 2;
 422
 423                 err = process_symbol(arg, symbol_name, symbol_type, start);
 424                 if (err)
 425                         break;
 426         }
 427
 428         free(line);
 429         fclose(file);
 430         return err;
 431
 432 out_failure:
 433         return -1;
 434 }
 435
 436 struct process_kallsyms_args {
 437         struct map *map;
 438         struct dso *dso;
 439 };
 440
 441 static int map__process_kallsym_symbol(void *arg, const char *name,
 442                                        char type, u64 start)
 443 {
 444         struct symbol *sym;
 445         struct process_kallsyms_args *a = arg;
 446         struct rb_root *root = &a->dso->symbols[a->map->type];
 447
 448         if (!symbol_type__is_a(type, a->map->type))
 449                 return 0;
 450
 451         /*
 452          * Will fix up the end later, when we have all symbols sorted.
 453          */
 454         sym = symbol__new(start, 0, name);
 455
 456         if (sym == NULL)
 457                 return -ENOMEM;
 458         /*
 459          * We will pass the symbols to the filter later, in
 460          * map__split_kallsyms, when we have split the maps per module
 461          */
 462         symbols__insert(root, sym);
 463
 464         return 0;
 465 }
 466
 467 /*
 468  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 469  * so that we can in the next step set the symbol ->end address and then
 470  * call kernel_maps__split_kallsyms.
 471  */
 472 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
 473                                   struct map *map)
 474 {
 475         struct process_kallsyms_args args = { .map = map, .dso = self, };
 476         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 477 }
 478
 479 /*
 480  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 481  * kernel range is broken in several maps, named [kernel].N, as we don't have
 482  * the original ELF section names vmlinux have.
 483  */
 484 static int dso__split_kallsyms(struct dso *self, struct map *map,
 485                                symbol_filter_t filter)
 486 {
 487         struct map_groups *kmaps = map__kmap(map)->kmaps;
 488         struct machine *machine = kmaps->machine;
 489         struct map *curr_map = map;
 490         struct symbol *pos;
 491         int count = 0;
 492         struct rb_root *root = &self->symbols[map->type];
 493         struct rb_node *next = rb_first(root);
 494         int kernel_range = 0;
 495
 496         while (next) {
 497                 char *module;
 498
 499                 pos = rb_entry(next, struct symbol, rb_node);
 500                 next = rb_next(&pos->rb_node);
 501
 502                 module = strchr(pos->name, '\t');
 503                 if (module) {
 504                         if (!symbol_conf.use_modules)
 505                                 goto discard_symbol;
 506
 507                         *module++ = '\0';
 508
 509                         if (strcmp(curr_map->dso->short_name, module)) {
 510                                 if (curr_map != map &&
 511                                     self->kernel == DSO_TYPE_GUEST_KERNEL &&
 512                                     machine__is_default_guest(machine)) {
 513                                         /*
 514                                          * We assume all symbols of a module are
 515                                          * continuous in * kallsyms, so curr_map
 516                                          * points to a module and all its
 517                                          * symbols are in its kmap. Mark it as
 518                                          * loaded.
 519                                          */
 520                                         dso__set_loaded(curr_map->dso,
 521                                                         curr_map->type);
 522                                 }
 523
 524                                 curr_map = map_groups__find_by_name(kmaps,
 525                                                         map->type, module);
 526                                 if (curr_map == NULL) {
 527                                         pr_err("%s/proc/{kallsyms,modules} "
 528                                                  "inconsistency while looking "
 529                                                  "for \"%s\" module!\n",
 530                                                  machine->root_dir, module);
 531                                         curr_map = map;
 532                                         goto discard_symbol;
 533                                 }
 534
 535                                 if (curr_map->dso->loaded &&
 536                                     !machine__is_default_guest(machine))
 537                                         goto discard_symbol;
 538                         }
 539                         /*
 540                          * So that we look just like we get from .ko files,
 541                          * i.e. not prelinked, relative to map->start.
 542                          */
 543                         pos->start = curr_map->map_ip(curr_map, pos->start);
 544                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 545                 } else if (curr_map != map) {
 546                         char dso_name[PATH_MAX];
 547                         struct dso *dso;
 548
 549                         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 550                                 snprintf(dso_name, sizeof(dso_name),
 551                                         "[guest.kernel].%d",
 552                                         kernel_range++);
 553                         else
 554                                 snprintf(dso_name, sizeof(dso_name),
 555                                         "[kernel].%d",
 556                                         kernel_range++);
 557
 558                         dso = dso__new(dso_name);
 559                         if (dso == NULL)
 560                                 return -1;
 561
 562                         dso->kernel = self->kernel;
 563
 564                         curr_map = map__new2(pos->start, dso, map->type);
 565                         if (curr_map == NULL) {
 566                                 dso__delete(dso);
 567                                 return -1;
 568                         }
 569
 570                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 571                         map_groups__insert(kmaps, curr_map);
 572                         ++kernel_range;
 573                 }
 574
 575                 if (filter && filter(curr_map, pos)) {
 576 discard_symbol:         rb_erase(&pos->rb_node, root);
 577                         symbol__delete(pos);
 578                 } else {
 579                         if (curr_map != map) {
 580                                 rb_erase(&pos->rb_node, root);
 581                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 582                         }
 583                         count++;
 584                 }
 585         }
 586
 587         if (curr_map != map &&
 588             self->kernel == DSO_TYPE_GUEST_KERNEL &&
 589             machine__is_default_guest(kmaps->machine)) {
 590                 dso__set_loaded(curr_map->dso, curr_map->type);
 591         }
 592
 593         return count;
 594 }
 595
 596 int dso__load_kallsyms(struct dso *self, const char *filename,
 597                        struct map *map, symbol_filter_t filter)
 598 {
 599         if (dso__load_all_kallsyms(self, filename, map) < 0)
 600                 return -1;
 601
 602         symbols__fixup_end(&self->symbols[map->type]);
 603         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 604                 self->origin = DSO__ORIG_GUEST_KERNEL;
 605         else
 606                 self->origin = DSO__ORIG_KERNEL;
 607
 608         return dso__split_kallsyms(self, map, filter);
 609 }
 610
 611 static int dso__load_perf_map(struct dso *self, struct map *map,
 612                               symbol_filter_t filter)
 613 {
 614         char *line = NULL;
 615         size_t n;
 616         FILE *file;
 617         int nr_syms = 0;
 618
 619         file = fopen(self->long_name, "r");
 620         if (file == NULL)
 621                 goto out_failure;
 622
 623         while (!feof(file)) {
 624                 u64 start, size;
 625                 struct symbol *sym;
 626                 int line_len, len;
 627
 628                 line_len = getline(&line, &n, file);
 629                 if (line_len < 0)
 630                         break;
 631
 632                 if (!line)
 633                         goto out_failure;
 634
 635                 line[--line_len] = '\0'; /* \n */
 636
 637                 len = hex2u64(line, &start);
 638
 639                 len++;
 640                 if (len + 2 >= line_len)
 641                         continue;
 642
 643                 len += hex2u64(line + len, &size);
 644
 645                 len++;
 646                 if (len + 2 >= line_len)
 647                         continue;
 648
 649                 sym = symbol__new(start, size, line + len);
 650
 651                 if (sym == NULL)
 652                         goto out_delete_line;
 653
 654                 if (filter && filter(map, sym))
 655                         symbol__delete(sym);
 656                 else {
 657                         symbols__insert(&self->symbols[map->type], sym);
 658                         nr_syms++;
 659                 }
 660         }
 661
 662         free(line);
 663         fclose(file);
 664
 665         return nr_syms;
 666
 667 out_delete_line:
 668         free(line);
 669 out_failure:
 670         return -1;
 671 }
 672
 673 /**
 674  * elf_symtab__for_each_symbol - iterate thru all the symbols
 675  *
 676  * @self: struct elf_symtab instance to iterate
 677  * @idx: uint32_t idx
 678  * @sym: GElf_Sym iterator
 679  */
 680 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
 681         for (idx = 0, gelf_getsym(syms, idx, &sym);\
 682              idx < nr_syms; \
 683              idx++, gelf_getsym(syms, idx, &sym))
 684
 685 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 686 {
 687         return GELF_ST_TYPE(sym->st_info);
 688 }
 689
 690 static inline int elf_sym__is_function(const GElf_Sym *sym)
 691 {
 692         return elf_sym__type(sym) == STT_FUNC &&
 693                sym->st_name != 0 &&
 694                sym->st_shndx != SHN_UNDEF;
 695 }
 696
 697 static inline bool elf_sym__is_object(const GElf_Sym *sym)
 698 {
 699         return elf_sym__type(sym) == STT_OBJECT &&
 700                 sym->st_name != 0 &&
 701                 sym->st_shndx != SHN_UNDEF;
 702 }
 703
 704 static inline int elf_sym__is_label(const GElf_Sym *sym)
 705 {
 706         return elf_sym__type(sym) == STT_NOTYPE &&
 707                 sym->st_name != 0 &&
 708                 sym->st_shndx != SHN_UNDEF &&
 709                 sym->st_shndx != SHN_ABS;
 710 }
 711
 712 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
 713                                         const Elf_Data *secstrs)
 714 {
 715         return secstrs->d_buf + shdr->sh_name;
 716 }
 717
 718 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
 719                                         const Elf_Data *secstrs)
 720 {
 721         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
 722 }
 723
 724 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
 725                                     const Elf_Data *secstrs)
 726 {
 727         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
 728 }
 729
 730 static inline const char *elf_sym__name(const GElf_Sym *sym,
 731                                         const Elf_Data *symstrs)
 732 {
 733         return symstrs->d_buf + sym->st_name;
 734 }
 735
 736 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 737                                     GElf_Shdr *shp, const char *name,
 738                                     size_t *idx)
 739 {
 740         Elf_Scn *sec = NULL;
 741         size_t cnt = 1;
 742
 743         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 744                 char *str;
 745
 746                 gelf_getshdr(sec, shp);
 747                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 748                 if (!strcmp(name, str)) {
 749                         if (idx)
 750                                 *idx = cnt;
 751                         break;
 752                 }
 753                 ++cnt;
 754         }
 755
 756         return sec;
 757 }
 758
 759 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 760         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 761              idx < nr_entries; \
 762              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
 763
 764 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
 765         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
 766              idx < nr_entries; \
 767              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 768
 769 /*
 770  * We need to check if we have a .dynsym, so that we can handle the
 771  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
 772  * .dynsym or .symtab).
 773  * And always look at the original dso, not at debuginfo packages, that
 774  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
 775  */
 776 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
 777                                        symbol_filter_t filter)
 778 {
 779         uint32_t nr_rel_entries, idx;
 780         GElf_Sym sym;
 781         u64 plt_offset;
 782         GElf_Shdr shdr_plt;
 783         struct symbol *f;
 784         GElf_Shdr shdr_rel_plt, shdr_dynsym;
 785         Elf_Data *reldata, *syms, *symstrs;
 786         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
 787         size_t dynsym_idx;
 788         GElf_Ehdr ehdr;
 789         char sympltname[1024];
 790         Elf *elf;
 791         int nr = 0, symidx, fd, err = 0;
 792
 793         fd = open(self->long_name, O_RDONLY);
 794         if (fd < 0)
 795                 goto out;
 796
 797         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 798         if (elf == NULL)
 799                 goto out_close;
 800
 801         if (gelf_getehdr(elf, &ehdr) == NULL)
 802                 goto out_elf_end;
 803
 804         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
 805                                          ".dynsym", &dynsym_idx);
 806         if (scn_dynsym == NULL)
 807                 goto out_elf_end;
 808
 809         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 810                                           ".rela.plt", NULL);
 811         if (scn_plt_rel == NULL) {
 812                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
 813                                                   ".rel.plt", NULL);
 814                 if (scn_plt_rel == NULL)
 815                         goto out_elf_end;
 816         }
 817
 818         err = -1;
 819
 820         if (shdr_rel_plt.sh_link != dynsym_idx)
 821                 goto out_elf_end;
 822
 823         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
 824                 goto out_elf_end;
 825
 826         /*
 827          * Fetch the relocation section to find the idxes to the GOT
 828          * and the symbols in the .dynsym they refer to.
 829          */
 830         reldata = elf_getdata(scn_plt_rel, NULL);
 831         if (reldata == NULL)
 832                 goto out_elf_end;
 833
 834         syms = elf_getdata(scn_dynsym, NULL);
 835         if (syms == NULL)
 836                 goto out_elf_end;
 837
 838         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
 839         if (scn_symstrs == NULL)
 840                 goto out_elf_end;
 841
 842         symstrs = elf_getdata(scn_symstrs, NULL);
 843         if (symstrs == NULL)
 844                 goto out_elf_end;
 845
 846         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 847         plt_offset = shdr_plt.sh_offset;
 848
 849         if (shdr_rel_plt.sh_type == SHT_RELA) {
 850                 GElf_Rela pos_mem, *pos;
 851
 852                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
 853                                            nr_rel_entries) {
 854                         symidx = GELF_R_SYM(pos->r_info);
 855                         plt_offset += shdr_plt.sh_entsize;
 856                         gelf_getsym(syms, symidx, &sym);
 857                         snprintf(sympltname, sizeof(sympltname),
 858                                  "%s@plt", elf_sym__name(&sym, symstrs));
 859
 860                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 861                                         sympltname);
 862                         if (!f)
 863                                 goto out_elf_end;
 864
 865                         if (filter && filter(map, f))
 866                                 symbol__delete(f);
 867                         else {
 868                                 symbols__insert(&self->symbols[map->type], f);
 869                                 ++nr;
 870                         }
 871                 }
 872         } else if (shdr_rel_plt.sh_type == SHT_REL) {
 873                 GElf_Rel pos_mem, *pos;
 874                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
 875                                           nr_rel_entries) {
 876                         symidx = GELF_R_SYM(pos->r_info);
 877                         plt_offset += shdr_plt.sh_entsize;
 878                         gelf_getsym(syms, symidx, &sym);
 879                         snprintf(sympltname, sizeof(sympltname),
 880                                  "%s@plt", elf_sym__name(&sym, symstrs));
 881
 882                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
 883                                         sympltname);
 884                         if (!f)
 885                                 goto out_elf_end;
 886
 887                         if (filter && filter(map, f))
 888                                 symbol__delete(f);
 889                         else {
 890                                 symbols__insert(&self->symbols[map->type], f);
 891                                 ++nr;
 892                         }
 893                 }
 894         }
 895
 896         err = 0;
 897 out_elf_end:
 898         elf_end(elf);
 899 out_close:
 900         close(fd);
 901
 902         if (err == 0)
 903                 return nr;
 904 out:
 905         pr_debug("%s: problems reading %s PLT info.\n",
 906                  __func__, self->long_name);
 907         return 0;
 908 }
 909
 910 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
 911 {
 912         switch (type) {
 913         case MAP__FUNCTION:
 914                 return elf_sym__is_function(self);
 915         case MAP__VARIABLE:
 916                 return elf_sym__is_object(self);
 917         default:
 918                 return false;
 919         }
 920 }
 921
 922 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
 923 {
 924         switch (type) {
 925         case MAP__FUNCTION:
 926                 return elf_sec__is_text(self, secstrs);
 927         case MAP__VARIABLE:
 928                 return elf_sec__is_data(self, secstrs);
 929         default:
 930                 return false;
 931         }
 932 }
 933
 934 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
 935                          int fd, symbol_filter_t filter, int kmodule)
 936 {
 937         struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
 938         struct map *curr_map = map;
 939         struct dso *curr_dso = self;
 940         Elf_Data *symstrs, *secstrs;
 941         uint32_t nr_syms;
 942         int err = -1;
 943         uint32_t idx;
 944         GElf_Ehdr ehdr;
 945         GElf_Shdr shdr;
 946         Elf_Data *syms;
 947         GElf_Sym sym;
 948         Elf_Scn *sec, *sec_strndx;
 949         Elf *elf;
 950         int nr = 0;
 951
 952         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 953         if (elf == NULL) {
 954                 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
 955                 goto out_close;
 956         }
 957
 958         if (gelf_getehdr(elf, &ehdr) == NULL) {
 959                 pr_err("%s: cannot get elf header.\n", __func__);
 960                 goto out_elf_end;
 961         }
 962
 963         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 964         if (sec == NULL) {
 965                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 966                 if (sec == NULL)
 967                         goto out_elf_end;
 968         }
 969
 970         syms = elf_getdata(sec, NULL);
 971         if (syms == NULL)
 972                 goto out_elf_end;
 973
 974         sec = elf_getscn(elf, shdr.sh_link);
 975         if (sec == NULL)
 976                 goto out_elf_end;
 977
 978         symstrs = elf_getdata(sec, NULL);
 979         if (symstrs == NULL)
 980                 goto out_elf_end;
 981
 982         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
 983         if (sec_strndx == NULL)
 984                 goto out_elf_end;
 985
 986         secstrs = elf_getdata(sec_strndx, NULL);
 987         if (secstrs == NULL)
 988                 goto out_elf_end;
 989
 990         nr_syms = shdr.sh_size / shdr.sh_entsize;
 991
 992         memset(&sym, 0, sizeof(sym));
 993         if (self->kernel == DSO_TYPE_USER) {
 994                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
 995                                 elf_section_by_name(elf, &ehdr, &shdr,
 996                                                      ".gnu.prelink_undo",
 997                                                      NULL) != NULL);
 998         } else self->adjust_symbols = 0;
 999
1000         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1001                 struct symbol *f;
1002                 const char *elf_name = elf_sym__name(&sym, symstrs);
1003                 char *demangled = NULL;
1004                 int is_label = elf_sym__is_label(&sym);
1005                 const char *section_name;
1006
1007                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1008                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1009                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1010
1011                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1012                         continue;
1013
1014                 sec = elf_getscn(elf, sym.st_shndx);
1015                 if (!sec)
1016                         goto out_elf_end;
1017
1018                 gelf_getshdr(sec, &shdr);
1019
1020                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1021                         continue;
1022
1023                 section_name = elf_sec__name(&shdr, secstrs);
1024
1025                 if (self->kernel != DSO_TYPE_USER || kmodule) {
1026                         char dso_name[PATH_MAX];
1027
1028                         if (strcmp(section_name,
1029                                    (curr_dso->short_name +
1030                                     self->short_name_len)) == 0)
1031                                 goto new_symbol;
1032
1033                         if (strcmp(section_name, ".text") == 0) {
1034                                 curr_map = map;
1035                                 curr_dso = self;
1036                                 goto new_symbol;
1037                         }
1038
1039                         snprintf(dso_name, sizeof(dso_name),
1040                                  "%s%s", self->short_name, section_name);
1041
1042                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1043                         if (curr_map == NULL) {
1044                                 u64 start = sym.st_value;
1045
1046                                 if (kmodule)
1047                                         start += map->start + shdr.sh_offset;
1048
1049                                 curr_dso = dso__new(dso_name);
1050                                 if (curr_dso == NULL)
1051                                         goto out_elf_end;
1052                                 curr_dso->kernel = self->kernel;
1053                                 curr_map = map__new2(start, curr_dso,
1054                                                      map->type);
1055                                 if (curr_map == NULL) {
1056                                         dso__delete(curr_dso);
1057                                         goto out_elf_end;
1058                                 }
1059                                 curr_map->map_ip = identity__map_ip;
1060                                 curr_map->unmap_ip = identity__map_ip;
1061                                 curr_dso->origin = self->origin;
1062                                 map_groups__insert(kmap->kmaps, curr_map);
1063                                 dsos__add(&self->node, curr_dso);
1064                                 dso__set_loaded(curr_dso, map->type);
1065                         } else
1066                                 curr_dso = curr_map->dso;
1067
1068                         goto new_symbol;
1069                 }
1070
1071                 if (curr_dso->adjust_symbols) {
1072                         pr_debug4("%s: adjusting symbol: st_value: %#Lx "
1073                                   "sh_addr: %#Lx sh_offset: %#Lx\n", __func__,
1074                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1075                                   (u64)shdr.sh_offset);
1076                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1077                 }
1078                 /*
1079                  * We need to figure out if the object was created from C++ sources
1080                  * DWARF DW_compile_unit has this, but we don't always have access
1081                  * to it...
1082                  */
1083                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1084                 if (demangled != NULL)
1085                         elf_name = demangled;
1086 new_symbol:
1087                 f = symbol__new(sym.st_value, sym.st_size, elf_name);
1088                 free(demangled);
1089                 if (!f)
1090                         goto out_elf_end;
1091
1092                 if (filter && filter(curr_map, f))
1093                         symbol__delete(f);
1094                 else {
1095                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1096                         nr++;
1097                 }
1098         }
1099
1100         /*
1101          * For misannotated, zeroed, ASM function sizes.
1102          */
1103         if (nr > 0) {
1104                 symbols__fixup_end(&self->symbols[map->type]);
1105                 if (kmap) {
1106                         /*
1107                          * We need to fixup this here too because we create new
1108                          * maps here, for things like vsyscall sections.
1109                          */
1110                         __map_groups__fixup_end(kmap->kmaps, map->type);
1111                 }
1112         }
1113         err = nr;
1114 out_elf_end:
1115         elf_end(elf);
1116 out_close:
1117         return err;
1118 }
1119
1120 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1121 {
1122         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1123 }
1124
1125 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1126 {
1127         bool have_build_id = false;
1128         struct dso *pos;
1129
1130         list_for_each_entry(pos, head, node) {
1131                 if (with_hits && !pos->hit)
1132                         continue;
1133                 if (filename__read_build_id(pos->long_name, pos->build_id,
1134                                             sizeof(pos->build_id)) > 0) {
1135                         have_build_id     = true;
1136                         pos->has_build_id = true;
1137                 }
1138         }
1139
1140         return have_build_id;
1141 }
1142
1143 /*
1144  * Align offset to 4 bytes as needed for note name and descriptor data.
1145  */
1146 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1147
1148 int filename__read_build_id(const char *filename, void *bf, size_t size)
1149 {
1150         int fd, err = -1;
1151         GElf_Ehdr ehdr;
1152         GElf_Shdr shdr;
1153         Elf_Data *data;
1154         Elf_Scn *sec;
1155         Elf_Kind ek;
1156         void *ptr;
1157         Elf *elf;
1158
1159         if (size < BUILD_ID_SIZE)
1160                 goto out;
1161
1162         fd = open(filename, O_RDONLY);
1163         if (fd < 0)
1164                 goto out;
1165
1166         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1167         if (elf == NULL) {
1168                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1169                 goto out_close;
1170         }
1171
1172         ek = elf_kind(elf);
1173         if (ek != ELF_K_ELF)
1174                 goto out_elf_end;
1175
1176         if (gelf_getehdr(elf, &ehdr) == NULL) {
1177                 pr_err("%s: cannot get elf header.\n", __func__);
1178                 goto out_elf_end;
1179         }
1180
1181         sec = elf_section_by_name(elf, &ehdr, &shdr,
1182                                   ".note.gnu.build-id", NULL);
1183         if (sec == NULL) {
1184                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1185                                           ".notes", NULL);
1186                 if (sec == NULL)
1187                         goto out_elf_end;
1188         }
1189
1190         data = elf_getdata(sec, NULL);
1191         if (data == NULL)
1192                 goto out_elf_end;
1193
1194         ptr = data->d_buf;
1195         while (ptr < (data->d_buf + data->d_size)) {
1196                 GElf_Nhdr *nhdr = ptr;
1197                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1198                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1199                 const char *name;
1200
1201                 ptr += sizeof(*nhdr);
1202                 name = ptr;
1203                 ptr += namesz;
1204                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1205                     nhdr->n_namesz == sizeof("GNU")) {
1206                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1207                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1208                                 err = BUILD_ID_SIZE;
1209                                 break;
1210                         }
1211                 }
1212                 ptr += descsz;
1213         }
1214 out_elf_end:
1215         elf_end(elf);
1216 out_close:
1217         close(fd);
1218 out:
1219         return err;
1220 }
1221
1222 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1223 {
1224         int fd, err = -1;
1225
1226         if (size < BUILD_ID_SIZE)
1227                 goto out;
1228
1229         fd = open(filename, O_RDONLY);
1230         if (fd < 0)
1231                 goto out;
1232
1233         while (1) {
1234                 char bf[BUFSIZ];
1235                 GElf_Nhdr nhdr;
1236                 int namesz, descsz;
1237
1238                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1239                         break;
1240
1241                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1242                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1243                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1244                     nhdr.n_namesz == sizeof("GNU")) {
1245                         if (read(fd, bf, namesz) != namesz)
1246                                 break;
1247                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1248                                 if (read(fd, build_id,
1249                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1250                                         err = 0;
1251                                         break;
1252                                 }
1253                         } else if (read(fd, bf, descsz) != descsz)
1254                                 break;
1255                 } else {
1256                         int n = namesz + descsz;
1257                         if (read(fd, bf, n) != n)
1258                                 break;
1259                 }
1260         }
1261         close(fd);
1262 out:
1263         return err;
1264 }
1265
1266 char dso__symtab_origin(const struct dso *self)
1267 {
1268         static const char origin[] = {
1269                 [DSO__ORIG_KERNEL] =   'k',
1270                 [DSO__ORIG_JAVA_JIT] = 'j',
1271                 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1272                 [DSO__ORIG_FEDORA] =   'f',
1273                 [DSO__ORIG_UBUNTU] =   'u',
1274                 [DSO__ORIG_BUILDID] =  'b',
1275                 [DSO__ORIG_DSO] =      'd',
1276                 [DSO__ORIG_KMODULE] =  'K',
1277                 [DSO__ORIG_GUEST_KERNEL] =  'g',
1278                 [DSO__ORIG_GUEST_KMODULE] =  'G',
1279         };
1280
1281         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1282                 return '!';
1283         return origin[self->origin];
1284 }
1285
1286 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1287 {
1288         int size = PATH_MAX;
1289         char *name;
1290         u8 build_id[BUILD_ID_SIZE];
1291         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1292         int ret = -1;
1293         int fd;
1294         struct machine *machine;
1295         const char *root_dir;
1296
1297         dso__set_loaded(self, map->type);
1298
1299         if (self->kernel == DSO_TYPE_KERNEL)
1300                 return dso__load_kernel_sym(self, map, filter);
1301         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1302                 return dso__load_guest_kernel_sym(self, map, filter);
1303
1304         if (map->groups && map->groups->machine)
1305                 machine = map->groups->machine;
1306         else
1307                 machine = NULL;
1308
1309         name = malloc(size);
1310         if (!name)
1311                 return -1;
1312
1313         self->adjust_symbols = 0;
1314
1315         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1316                 ret = dso__load_perf_map(self, map, filter);
1317                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1318                                          DSO__ORIG_NOT_FOUND;
1319                 return ret;
1320         }
1321
1322         self->origin = DSO__ORIG_BUILD_ID_CACHE;
1323
1324         if (self->has_build_id) {
1325                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1326                                   build_id_hex);
1327                 snprintf(name, size, "%s/%s/.build-id/%.2s/%s",
1328                          getenv("HOME"), DEBUG_CACHE_DIR,
1329                          build_id_hex, build_id_hex + 2);
1330                 goto open_file;
1331         }
1332 more:
1333         do {
1334                 self->origin++;
1335                 switch (self->origin) {
1336                 case DSO__ORIG_FEDORA:
1337                         snprintf(name, size, "/usr/lib/debug%s.debug",
1338                                  self->long_name);
1339                         break;
1340                 case DSO__ORIG_UBUNTU:
1341                         snprintf(name, size, "/usr/lib/debug%s",
1342                                  self->long_name);
1343                         break;
1344                 case DSO__ORIG_BUILDID:
1345                         if (filename__read_build_id(self->long_name, build_id,
1346                                                     sizeof(build_id))) {
1347                                 build_id__sprintf(build_id, sizeof(build_id),
1348                                                   build_id_hex);
1349                                 snprintf(name, size,
1350                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
1351                                         build_id_hex, build_id_hex + 2);
1352                                 if (self->has_build_id)
1353                                         goto compare_build_id;
1354                                 break;
1355                         }
1356                         self->origin++;
1357                         /* Fall thru */
1358                 case DSO__ORIG_DSO:
1359                         snprintf(name, size, "%s", self->long_name);
1360                         break;
1361                 case DSO__ORIG_GUEST_KMODULE:
1362                         if (map->groups && map->groups->machine)
1363                                 root_dir = map->groups->machine->root_dir;
1364                         else
1365                                 root_dir = "";
1366                         snprintf(name, size, "%s%s", root_dir, self->long_name);
1367                         break;
1368
1369                 default:
1370                         goto out;
1371                 }
1372
1373                 if (self->has_build_id) {
1374                         if (filename__read_build_id(name, build_id,
1375                                                     sizeof(build_id)) < 0)
1376                                 goto more;
1377 compare_build_id:
1378                         if (!dso__build_id_equal(self, build_id))
1379                                 goto more;
1380                 }
1381 open_file:
1382                 fd = open(name, O_RDONLY);
1383         } while (fd < 0);
1384
1385         ret = dso__load_sym(self, map, name, fd, filter, 0);
1386         close(fd);
1387
1388         /*
1389          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1390          */
1391         if (!ret)
1392                 goto more;
1393
1394         if (ret > 0) {
1395                 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1396                 if (nr_plt > 0)
1397                         ret += nr_plt;
1398         }
1399 out:
1400         free(name);
1401         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1402                 return 0;
1403         return ret;
1404 }
1405
1406 struct map *map_groups__find_by_name(struct map_groups *self,
1407                                      enum map_type type, const char *name)
1408 {
1409         struct rb_node *nd;
1410
1411         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1412                 struct map *map = rb_entry(nd, struct map, rb_node);
1413
1414                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1415                         return map;
1416         }
1417
1418         return NULL;
1419 }
1420
1421 static int dso__kernel_module_get_build_id(struct dso *self,
1422                                 const char *root_dir)
1423 {
1424         char filename[PATH_MAX];
1425         /*
1426          * kernel module short names are of the form "[module]" and
1427          * we need just "module" here.
1428          */
1429         const char *name = self->short_name + 1;
1430
1431         snprintf(filename, sizeof(filename),
1432                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1433                  root_dir, (int)strlen(name) - 1, name);
1434
1435         if (sysfs__read_build_id(filename, self->build_id,
1436                                  sizeof(self->build_id)) == 0)
1437                 self->has_build_id = true;
1438
1439         return 0;
1440 }
1441
1442 static int map_groups__set_modules_path_dir(struct map_groups *self,
1443                                 const char *dir_name)
1444 {
1445         struct dirent *dent;
1446         DIR *dir = opendir(dir_name);
1447
1448         if (!dir) {
1449                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1450                 return -1;
1451         }
1452
1453         while ((dent = readdir(dir)) != NULL) {
1454                 char path[PATH_MAX];
1455                 struct stat st;
1456
1457                 /*sshfs might return bad dent->d_type, so we have to stat*/
1458                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1459                 if (stat(path, &st))
1460                         continue;
1461
1462                 if (S_ISDIR(st.st_mode)) {
1463                         if (!strcmp(dent->d_name, ".") ||
1464                             !strcmp(dent->d_name, ".."))
1465                                 continue;
1466
1467                         snprintf(path, sizeof(path), "%s/%s",
1468                                  dir_name, dent->d_name);
1469                         if (map_groups__set_modules_path_dir(self, path) < 0)
1470                                 goto failure;
1471                 } else {
1472                         char *dot = strrchr(dent->d_name, '.'),
1473                              dso_name[PATH_MAX];
1474                         struct map *map;
1475                         char *long_name;
1476
1477                         if (dot == NULL || strcmp(dot, ".ko"))
1478                                 continue;
1479                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1480                                  (int)(dot - dent->d_name), dent->d_name);
1481
1482                         strxfrchar(dso_name, '-', '_');
1483                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1484                         if (map == NULL)
1485                                 continue;
1486
1487                         snprintf(path, sizeof(path), "%s/%s",
1488                                  dir_name, dent->d_name);
1489
1490                         long_name = strdup(path);
1491                         if (long_name == NULL)
1492                                 goto failure;
1493                         dso__set_long_name(map->dso, long_name);
1494                         dso__kernel_module_get_build_id(map->dso, "");
1495                 }
1496         }
1497
1498         return 0;
1499 failure:
1500         closedir(dir);
1501         return -1;
1502 }
1503
1504 static char *get_kernel_version(const char *root_dir)
1505 {
1506         char version[PATH_MAX];
1507         FILE *file;
1508         char *name, *tmp;
1509         const char *prefix = "Linux version ";
1510
1511         sprintf(version, "%s/proc/version", root_dir);
1512         file = fopen(version, "r");
1513         if (!file)
1514                 return NULL;
1515
1516         version[0] = '\0';
1517         tmp = fgets(version, sizeof(version), file);
1518         fclose(file);
1519
1520         name = strstr(version, prefix);
1521         if (!name)
1522                 return NULL;
1523         name += strlen(prefix);
1524         tmp = strchr(name, ' ');
1525         if (tmp)
1526                 *tmp = '\0';
1527
1528         return strdup(name);
1529 }
1530
1531 static int machine__set_modules_path(struct machine *self)
1532 {
1533         char *version;
1534         char modules_path[PATH_MAX];
1535
1536         version = get_kernel_version(self->root_dir);
1537         if (!version)
1538                 return -1;
1539
1540         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1541                  self->root_dir, version);
1542         free(version);
1543
1544         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1545 }
1546
1547 /*
1548  * Constructor variant for modules (where we know from /proc/modules where
1549  * they are loaded) and for vmlinux, where only after we load all the
1550  * symbols we'll know where it starts and ends.
1551  */
1552 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1553 {
1554         struct map *self = calloc(1, (sizeof(*self) +
1555                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1556         if (self != NULL) {
1557                 /*
1558                  * ->end will be filled after we load all the symbols
1559                  */
1560                 map__init(self, type, start, 0, 0, dso);
1561         }
1562
1563         return self;
1564 }
1565
1566 struct map *machine__new_module(struct machine *self, u64 start,
1567                                 const char *filename)
1568 {
1569         struct map *map;
1570         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1571
1572         if (dso == NULL)
1573                 return NULL;
1574
1575         map = map__new2(start, dso, MAP__FUNCTION);
1576         if (map == NULL)
1577                 return NULL;
1578
1579         if (machine__is_host(self))
1580                 dso->origin = DSO__ORIG_KMODULE;
1581         else
1582                 dso->origin = DSO__ORIG_GUEST_KMODULE;
1583         map_groups__insert(&self->kmaps, map);
1584         return map;
1585 }
1586
1587 static int machine__create_modules(struct machine *self)
1588 {
1589         char *line = NULL;
1590         size_t n;
1591         FILE *file;
1592         struct map *map;
1593         const char *modules;
1594         char path[PATH_MAX];
1595
1596         if (machine__is_default_guest(self))
1597                 modules = symbol_conf.default_guest_modules;
1598         else {
1599                 sprintf(path, "%s/proc/modules", self->root_dir);
1600                 modules = path;
1601         }
1602
1603         file = fopen(modules, "r");
1604         if (file == NULL)
1605                 return -1;
1606
1607         while (!feof(file)) {
1608                 char name[PATH_MAX];
1609                 u64 start;
1610                 char *sep;
1611                 int line_len;
1612
1613                 line_len = getline(&line, &n, file);
1614                 if (line_len < 0)
1615                         break;
1616
1617                 if (!line)
1618                         goto out_failure;
1619
1620                 line[--line_len] = '\0'; /* \n */
1621
1622                 sep = strrchr(line, 'x');
1623                 if (sep == NULL)
1624                         continue;
1625
1626                 hex2u64(sep + 1, &start);
1627
1628                 sep = strchr(line, ' ');
1629                 if (sep == NULL)
1630                         continue;
1631
1632                 *sep = '\0';
1633
1634                 snprintf(name, sizeof(name), "[%s]", line);
1635                 map = machine__new_module(self, start, name);
1636                 if (map == NULL)
1637                         goto out_delete_line;
1638                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1639         }
1640
1641         free(line);
1642         fclose(file);
1643
1644         return machine__set_modules_path(self);
1645
1646 out_delete_line:
1647         free(line);
1648 out_failure:
1649         return -1;
1650 }
1651
1652 static int dso__load_vmlinux(struct dso *self, struct map *map,
1653                              const char *vmlinux, symbol_filter_t filter)
1654 {
1655         int err = -1, fd;
1656
1657         if (self->has_build_id) {
1658                 u8 build_id[BUILD_ID_SIZE];
1659
1660                 if (filename__read_build_id(vmlinux, build_id,
1661                                             sizeof(build_id)) < 0) {
1662                         pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1663                         return -1;
1664                 }
1665                 if (!dso__build_id_equal(self, build_id)) {
1666                         char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1667                              vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1668
1669                         build_id__sprintf(self->build_id,
1670                                           sizeof(self->build_id),
1671                                           expected_build_id);
1672                         build_id__sprintf(build_id, sizeof(build_id),
1673                                           vmlinux_build_id);
1674                         pr_debug("build_id in %s is %s while expected is %s, "
1675                                  "ignoring it\n", vmlinux, vmlinux_build_id,
1676                                  expected_build_id);
1677                         return -1;
1678                 }
1679         }
1680
1681         fd = open(vmlinux, O_RDONLY);
1682         if (fd < 0)
1683                 return -1;
1684
1685         dso__set_loaded(self, map->type);
1686         err = dso__load_sym(self, map, vmlinux, fd, filter, 0);
1687         close(fd);
1688
1689         if (err > 0)
1690                 pr_debug("Using %s for symbols\n", vmlinux);
1691
1692         return err;
1693 }
1694
1695 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1696                            symbol_filter_t filter)
1697 {
1698         int i, err = 0;
1699
1700         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1701                  vmlinux_path__nr_entries);
1702
1703         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1704                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1705                 if (err > 0) {
1706                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1707                         break;
1708                 }
1709         }
1710
1711         return err;
1712 }
1713
1714 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1715                                 symbol_filter_t filter)
1716 {
1717         int err;
1718         const char *kallsyms_filename = NULL;
1719         char *kallsyms_allocated_filename = NULL;
1720         /*
1721          * Step 1: if the user specified a vmlinux filename, use it and only
1722          * it, reporting errors to the user if it cannot be used.
1723          *
1724          * For instance, try to analyse an ARM perf.data file _without_ a
1725          * build-id, or if the user specifies the wrong path to the right
1726          * vmlinux file, obviously we can't fallback to another vmlinux (a
1727          * x86_86 one, on the machine where analysis is being performed, say),
1728          * or worse, /proc/kallsyms.
1729          *
1730          * If the specified file _has_ a build-id and there is a build-id
1731          * section in the perf.data file, we will still do the expected
1732          * validation in dso__load_vmlinux and will bail out if they don't
1733          * match.
1734          */
1735         if (symbol_conf.vmlinux_name != NULL) {
1736                 err = dso__load_vmlinux(self, map,
1737                                         symbol_conf.vmlinux_name, filter);
1738                 goto out_try_fixup;
1739         }
1740
1741         if (vmlinux_path != NULL) {
1742                 err = dso__load_vmlinux_path(self, map, filter);
1743                 if (err > 0)
1744                         goto out_fixup;
1745         }
1746
1747         /*
1748          * Say the kernel DSO was created when processing the build-id header table,
1749          * we have a build-id, so check if it is the same as the running kernel,
1750          * using it if it is.
1751          */
1752         if (self->has_build_id) {
1753                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1754                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1755
1756                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1757                                          sizeof(kallsyms_build_id)) == 0) {
1758                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1759                                 kallsyms_filename = "/proc/kallsyms";
1760                                 goto do_kallsyms;
1761                         }
1762                 }
1763                 /*
1764                  * Now look if we have it on the build-id cache in
1765                  * $HOME/.debug/[kernel.kallsyms].
1766                  */
1767                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1768                                   sbuild_id);
1769
1770                 if (asprintf(&kallsyms_allocated_filename,
1771                              "%s/.debug/[kernel.kallsyms]/%s",
1772                              getenv("HOME"), sbuild_id) == -1) {
1773                         pr_err("Not enough memory for kallsyms file lookup\n");
1774                         return -1;
1775                 }
1776
1777                 kallsyms_filename = kallsyms_allocated_filename;
1778
1779                 if (access(kallsyms_filename, F_OK)) {
1780                         pr_err("No kallsyms or vmlinux with build-id %s "
1781                                "was found\n", sbuild_id);
1782                         free(kallsyms_allocated_filename);
1783                         return -1;
1784                 }
1785         } else {
1786                 /*
1787                  * Last resort, if we don't have a build-id and couldn't find
1788                  * any vmlinux file, try the running kernel kallsyms table.
1789                  */
1790                 kallsyms_filename = "/proc/kallsyms";
1791         }
1792
1793 do_kallsyms:
1794         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1795         if (err > 0)
1796                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1797         free(kallsyms_allocated_filename);
1798
1799 out_try_fixup:
1800         if (err > 0) {
1801 out_fixup:
1802                 if (kallsyms_filename != NULL)
1803                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1804                 map__fixup_start(map);
1805                 map__fixup_end(map);
1806         }
1807
1808         return err;
1809 }
1810
1811 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1812                                 symbol_filter_t filter)
1813 {
1814         int err;
1815         const char *kallsyms_filename = NULL;
1816         struct machine *machine;
1817         char path[PATH_MAX];
1818
1819         if (!map->groups) {
1820                 pr_debug("Guest kernel map hasn't the point to groups\n");
1821                 return -1;
1822         }
1823         machine = map->groups->machine;
1824
1825         if (machine__is_default_guest(machine)) {
1826                 /*
1827                  * if the user specified a vmlinux filename, use it and only
1828                  * it, reporting errors to the user if it cannot be used.
1829                  * Or use file guest_kallsyms inputted by user on commandline
1830                  */
1831                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1832                         err = dso__load_vmlinux(self, map,
1833                                 symbol_conf.default_guest_vmlinux_name, filter);
1834                         goto out_try_fixup;
1835                 }
1836
1837                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1838                 if (!kallsyms_filename)
1839                         return -1;
1840         } else {
1841                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1842                 kallsyms_filename = path;
1843         }
1844
1845         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1846         if (err > 0)
1847                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1848
1849 out_try_fixup:
1850         if (err > 0) {
1851                 if (kallsyms_filename != NULL) {
1852                         machine__mmap_name(machine, path, sizeof(path));
1853                         dso__set_long_name(self, strdup(path));
1854                 }
1855                 map__fixup_start(map);
1856                 map__fixup_end(map);
1857         }
1858
1859         return err;
1860 }
1861
1862 static void dsos__add(struct list_head *head, struct dso *dso)
1863 {
1864         list_add_tail(&dso->node, head);
1865 }
1866
1867 static struct dso *dsos__find(struct list_head *head, const char *name)
1868 {
1869         struct dso *pos;
1870
1871         list_for_each_entry(pos, head, node)
1872                 if (strcmp(pos->long_name, name) == 0)
1873                         return pos;
1874         return NULL;
1875 }
1876
1877 struct dso *__dsos__findnew(struct list_head *head, const char *name)
1878 {
1879         struct dso *dso = dsos__find(head, name);
1880
1881         if (!dso) {
1882                 dso = dso__new(name);
1883                 if (dso != NULL) {
1884                         dsos__add(head, dso);
1885                         dso__set_basename(dso);
1886                 }
1887         }
1888
1889         return dso;
1890 }
1891
1892 static void __dsos__fprintf(struct list_head *head, FILE *fp)
1893 {
1894         struct dso *pos;
1895
1896         list_for_each_entry(pos, head, node) {
1897                 int i;
1898                 for (i = 0; i < MAP__NR_TYPES; ++i)
1899                         dso__fprintf(pos, i, fp);
1900         }
1901 }
1902
1903 void dsos__fprintf(struct rb_root *machines, FILE *fp)
1904 {
1905         struct rb_node *nd;
1906
1907         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
1908                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1909                 __dsos__fprintf(&pos->kernel_dsos, fp);
1910                 __dsos__fprintf(&pos->user_dsos, fp);
1911         }
1912 }
1913
1914 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
1915                                       bool with_hits)
1916 {
1917         struct dso *pos;
1918         size_t ret = 0;
1919
1920         list_for_each_entry(pos, head, node) {
1921                 if (with_hits && !pos->hit)
1922                         continue;
1923                 ret += dso__fprintf_buildid(pos, fp);
1924                 ret += fprintf(fp, " %s\n", pos->long_name);
1925         }
1926         return ret;
1927 }
1928
1929 size_t dsos__fprintf_buildid(struct rb_root *machines, FILE *fp, bool with_hits)
1930 {
1931         struct rb_node *nd;
1932         size_t ret = 0;
1933
1934         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
1935                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1936                 ret += __dsos__fprintf_buildid(&pos->kernel_dsos, fp, with_hits);
1937                 ret += __dsos__fprintf_buildid(&pos->user_dsos, fp, with_hits);
1938         }
1939         return ret;
1940 }
1941
1942 struct dso *dso__new_kernel(const char *name)
1943 {
1944         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
1945
1946         if (self != NULL) {
1947                 dso__set_short_name(self, "[kernel]");
1948                 self->kernel = DSO_TYPE_KERNEL;
1949         }
1950
1951         return self;
1952 }
1953
1954 static struct dso *dso__new_guest_kernel(struct machine *machine,
1955                                         const char *name)
1956 {
1957         char bf[PATH_MAX];
1958         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
1959
1960         if (self != NULL) {
1961                 dso__set_short_name(self, "[guest.kernel]");
1962                 self->kernel = DSO_TYPE_GUEST_KERNEL;
1963         }
1964
1965         return self;
1966 }
1967
1968 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
1969 {
1970         char path[PATH_MAX];
1971
1972         if (machine__is_default_guest(machine))
1973                 return;
1974         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
1975         if (sysfs__read_build_id(path, self->build_id,
1976                                  sizeof(self->build_id)) == 0)
1977                 self->has_build_id = true;
1978 }
1979
1980 static struct dso *dsos__create_kernel(struct machine *machine)
1981 {
1982         const char *vmlinux_name = NULL;
1983         struct dso *kernel;
1984
1985         if (machine__is_host(machine)) {
1986                 vmlinux_name = symbol_conf.vmlinux_name;
1987                 kernel = dso__new_kernel(vmlinux_name);
1988         } else {
1989                 if (machine__is_default_guest(machine))
1990                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
1991                 kernel = dso__new_guest_kernel(machine, vmlinux_name);
1992         }
1993
1994         if (kernel != NULL) {
1995                 dso__read_running_kernel_build_id(kernel, machine);
1996                 dsos__add(&machine->kernel_dsos, kernel);
1997         }
1998         return kernel;
1999 }
2000
2001 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2002 {
2003         enum map_type type;
2004
2005         for (type = 0; type < MAP__NR_TYPES; ++type) {
2006                 struct kmap *kmap;
2007
2008                 self->vmlinux_maps[type] = map__new2(0, kernel, type);
2009                 if (self->vmlinux_maps[type] == NULL)
2010                         return -1;
2011
2012                 self->vmlinux_maps[type]->map_ip =
2013                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2014
2015                 kmap = map__kmap(self->vmlinux_maps[type]);
2016                 kmap->kmaps = &self->kmaps;
2017                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2018         }
2019
2020         return 0;
2021 }
2022
2023 static void vmlinux_path__exit(void)
2024 {
2025         while (--vmlinux_path__nr_entries >= 0) {
2026                 free(vmlinux_path[vmlinux_path__nr_entries]);
2027                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2028         }
2029
2030         free(vmlinux_path);
2031         vmlinux_path = NULL;
2032 }
2033
2034 static int vmlinux_path__init(void)
2035 {
2036         struct utsname uts;
2037         char bf[PATH_MAX];
2038
2039         if (uname(&uts) < 0)
2040                 return -1;
2041
2042         vmlinux_path = malloc(sizeof(char *) * 5);
2043         if (vmlinux_path == NULL)
2044                 return -1;
2045
2046         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2047         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2048                 goto out_fail;
2049         ++vmlinux_path__nr_entries;
2050         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2051         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2052                 goto out_fail;
2053         ++vmlinux_path__nr_entries;
2054         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2055         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2056         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2057                 goto out_fail;
2058         ++vmlinux_path__nr_entries;
2059         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2060         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2061         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2062                 goto out_fail;
2063         ++vmlinux_path__nr_entries;
2064         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2065                  uts.release);
2066         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2067         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2068                 goto out_fail;
2069         ++vmlinux_path__nr_entries;
2070
2071         return 0;
2072
2073 out_fail:
2074         vmlinux_path__exit();
2075         return -1;
2076 }
2077
2078 size_t vmlinux_path__fprintf(FILE *fp)
2079 {
2080         int i;
2081         size_t printed = 0;
2082
2083         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2084                 printed += fprintf(fp, "[%d] %s\n", i, vmlinux_path[i]);
2085
2086         return printed;
2087 }
2088
2089 static int setup_list(struct strlist **list, const char *list_str,
2090                       const char *list_name)
2091 {
2092         if (list_str == NULL)
2093                 return 0;
2094
2095         *list = strlist__new(true, list_str);
2096         if (!*list) {
2097                 pr_err("problems parsing %s list\n", list_name);
2098                 return -1;
2099         }
2100         return 0;
2101 }
2102
2103 int symbol__init(void)
2104 {
2105         elf_version(EV_CURRENT);
2106         if (symbol_conf.sort_by_name)
2107                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2108                                           sizeof(struct symbol));
2109
2110         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2111                 return -1;
2112
2113         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2114                 pr_err("'.' is the only non valid --field-separator argument\n");
2115                 return -1;
2116         }
2117
2118         if (setup_list(&symbol_conf.dso_list,
2119                        symbol_conf.dso_list_str, "dso") < 0)
2120                 return -1;
2121
2122         if (setup_list(&symbol_conf.comm_list,
2123                        symbol_conf.comm_list_str, "comm") < 0)
2124                 goto out_free_dso_list;
2125
2126         if (setup_list(&symbol_conf.sym_list,
2127                        symbol_conf.sym_list_str, "symbol") < 0)
2128                 goto out_free_comm_list;
2129
2130         return 0;
2131
2132 out_free_dso_list:
2133         strlist__delete(symbol_conf.dso_list);
2134 out_free_comm_list:
2135         strlist__delete(symbol_conf.comm_list);
2136         return -1;
2137 }
2138
2139 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2140 {
2141         struct dso *kernel;
2142         struct machine *machine = machines__findnew(self, pid);
2143
2144         if (machine == NULL)
2145                 return -1;
2146         kernel = dsos__create_kernel(machine);
2147         if (kernel == NULL)
2148                 return -1;
2149
2150         if (__machine__create_kernel_maps(machine, kernel) < 0)
2151                 return -1;
2152
2153         if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2154                 pr_debug("Problems creating module maps, continuing anyway...\n");
2155         /*
2156          * Now that we have all the maps created, just set the ->end of them:
2157          */
2158         map_groups__fixup_end(&machine->kmaps);
2159         return 0;
2160 }
2161
2162 static int hex(char ch)
2163 {
2164         if ((ch >= '0') && (ch <= '9'))
2165                 return ch - '0';
2166         if ((ch >= 'a') && (ch <= 'f'))
2167                 return ch - 'a' + 10;
2168         if ((ch >= 'A') && (ch <= 'F'))
2169                 return ch - 'A' + 10;
2170         return -1;
2171 }
2172
2173 /*
2174  * While we find nice hex chars, build a long_val.
2175  * Return number of chars processed.
2176  */
2177 int hex2u64(const char *ptr, u64 *long_val)
2178 {
2179         const char *p = ptr;
2180         *long_val = 0;
2181
2182         while (*p) {
2183                 const int hex_val = hex(*p);
2184
2185                 if (hex_val < 0)
2186                         break;
2187
2188                 *long_val = (*long_val << 4) | hex_val;
2189                 p++;
2190         }
2191
2192         return p - ptr;
2193 }
2194
2195 char *strxfrchar(char *s, char from, char to)
2196 {
2197         char *p = s;
2198
2199         while ((p = strchr(p, from)) != NULL)
2200                 *p++ = to;
2201
2202         return s;
2203 }
2204
2205 int machines__create_guest_kernel_maps(struct rb_root *self)
2206 {
2207         int ret = 0;
2208         struct dirent **namelist = NULL;
2209         int i, items = 0;
2210         char path[PATH_MAX];
2211         pid_t pid;
2212
2213         if (symbol_conf.default_guest_vmlinux_name ||
2214             symbol_conf.default_guest_modules ||
2215             symbol_conf.default_guest_kallsyms) {
2216                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2217         }
2218
2219         if (symbol_conf.guestmount) {
2220                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2221                 if (items <= 0)
2222                         return -ENOENT;
2223                 for (i = 0; i < items; i++) {
2224                         if (!isdigit(namelist[i]->d_name[0])) {
2225                                 /* Filter out . and .. */
2226                                 continue;
2227                         }
2228                         pid = atoi(namelist[i]->d_name);
2229                         sprintf(path, "%s/%s/proc/kallsyms",
2230                                 symbol_conf.guestmount,
2231                                 namelist[i]->d_name);
2232                         ret = access(path, R_OK);
2233                         if (ret) {
2234                                 pr_debug("Can't access file %s\n", path);
2235                                 goto failure;
2236                         }
2237                         machines__create_kernel_maps(self, pid);
2238                 }
2239 failure:
2240                 free(namelist);
2241         }
2242
2243         return ret;
2244 }