tools/perf/util/symbol.c

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