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
1529         if (!dir) {
1530                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1531                 return -1;
1532         }
1533
1534         while ((dent = readdir(dir)) != NULL) {
1535                 char path[PATH_MAX];
1536                 struct stat st;
1537
1538                 /*sshfs might return bad dent->d_type, so we have to stat*/
1539                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1540                 if (stat(path, &st))
1541                         continue;
1542
1543                 if (S_ISDIR(st.st_mode)) {
1544                         if (!strcmp(dent->d_name, ".") ||
1545                             !strcmp(dent->d_name, ".."))
1546                                 continue;
1547
1548                         snprintf(path, sizeof(path), "%s/%s",
1549                                  dir_name, dent->d_name);
1550                         if (map_groups__set_modules_path_dir(self, path) < 0)
1551                                 goto failure;
1552                 } else {
1553                         char *dot = strrchr(dent->d_name, '.'),
1554                              dso_name[PATH_MAX];
1555                         struct map *map;
1556                         char *long_name;
1557
1558                         if (dot == NULL || strcmp(dot, ".ko"))
1559                                 continue;
1560                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1561                                  (int)(dot - dent->d_name), dent->d_name);
1562
1563                         strxfrchar(dso_name, '-', '_');
1564                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1565                         if (map == NULL)
1566                                 continue;
1567
1568                         snprintf(path, sizeof(path), "%s/%s",
1569                                  dir_name, dent->d_name);
1570
1571                         long_name = strdup(path);
1572                         if (long_name == NULL)
1573                                 goto failure;
1574                         dso__set_long_name(map->dso, long_name);
1575                         map->dso->lname_alloc = 1;
1576                         dso__kernel_module_get_build_id(map->dso, "");
1577                 }
1578         }
1579
1580         return 0;
1581 failure:
1582         closedir(dir);
1583         return -1;
1584 }
1585
1586 static char *get_kernel_version(const char *root_dir)
1587 {
1588         char version[PATH_MAX];
1589         FILE *file;
1590         char *name, *tmp;
1591         const char *prefix = "Linux version ";
1592
1593         sprintf(version, "%s/proc/version", root_dir);
1594         file = fopen(version, "r");
1595         if (!file)
1596                 return NULL;
1597
1598         version[0] = '\0';
1599         tmp = fgets(version, sizeof(version), file);
1600         fclose(file);
1601
1602         name = strstr(version, prefix);
1603         if (!name)
1604                 return NULL;
1605         name += strlen(prefix);
1606         tmp = strchr(name, ' ');
1607         if (tmp)
1608                 *tmp = '\0';
1609
1610         return strdup(name);
1611 }
1612
1613 static int machine__set_modules_path(struct machine *self)
1614 {
1615         char *version;
1616         char modules_path[PATH_MAX];
1617
1618         version = get_kernel_version(self->root_dir);
1619         if (!version)
1620                 return -1;
1621
1622         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1623                  self->root_dir, version);
1624         free(version);
1625
1626         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1627 }
1628
1629 /*
1630  * Constructor variant for modules (where we know from /proc/modules where
1631  * they are loaded) and for vmlinux, where only after we load all the
1632  * symbols we'll know where it starts and ends.
1633  */
1634 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1635 {
1636         struct map *self = calloc(1, (sizeof(*self) +
1637                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1638         if (self != NULL) {
1639                 /*
1640                  * ->end will be filled after we load all the symbols
1641                  */
1642                 map__init(self, type, start, 0, 0, dso);
1643         }
1644
1645         return self;
1646 }
1647
1648 struct map *machine__new_module(struct machine *self, u64 start,
1649                                 const char *filename)
1650 {
1651         struct map *map;
1652         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1653
1654         if (dso == NULL)
1655                 return NULL;
1656
1657         map = map__new2(start, dso, MAP__FUNCTION);
1658         if (map == NULL)
1659                 return NULL;
1660
1661         if (machine__is_host(self))
1662                 dso->origin = DSO__ORIG_KMODULE;
1663         else
1664                 dso->origin = DSO__ORIG_GUEST_KMODULE;
1665         map_groups__insert(&self->kmaps, map);
1666         return map;
1667 }
1668
1669 static int machine__create_modules(struct machine *self)
1670 {
1671         char *line = NULL;
1672         size_t n;
1673         FILE *file;
1674         struct map *map;
1675         const char *modules;
1676         char path[PATH_MAX];
1677
1678         if (machine__is_default_guest(self))
1679                 modules = symbol_conf.default_guest_modules;
1680         else {
1681                 sprintf(path, "%s/proc/modules", self->root_dir);
1682                 modules = path;
1683         }
1684
1685         file = fopen(modules, "r");
1686         if (file == NULL)
1687                 return -1;
1688
1689         while (!feof(file)) {
1690                 char name[PATH_MAX];
1691                 u64 start;
1692                 char *sep;
1693                 int line_len;
1694
1695                 line_len = getline(&line, &n, file);
1696                 if (line_len < 0)
1697                         break;
1698
1699                 if (!line)
1700                         goto out_failure;
1701
1702                 line[--line_len] = '\0'; /* \n */
1703
1704                 sep = strrchr(line, 'x');
1705                 if (sep == NULL)
1706                         continue;
1707
1708                 hex2u64(sep + 1, &start);
1709
1710                 sep = strchr(line, ' ');
1711                 if (sep == NULL)
1712                         continue;
1713
1714                 *sep = '\0';
1715
1716                 snprintf(name, sizeof(name), "[%s]", line);
1717                 map = machine__new_module(self, start, name);
1718                 if (map == NULL)
1719                         goto out_delete_line;
1720                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1721         }
1722
1723         free(line);
1724         fclose(file);
1725
1726         return machine__set_modules_path(self);
1727
1728 out_delete_line:
1729         free(line);
1730 out_failure:
1731         return -1;
1732 }
1733
1734 static int dso__load_vmlinux(struct dso *self, struct map *map,
1735                              const char *vmlinux, symbol_filter_t filter)
1736 {
1737         int err = -1, fd;
1738
1739         fd = open(vmlinux, O_RDONLY);
1740         if (fd < 0)
1741                 return -1;
1742
1743         dso__set_loaded(self, map->type);
1744         err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
1745         close(fd);
1746
1747         if (err > 0)
1748                 pr_debug("Using %s for symbols\n", vmlinux);
1749
1750         return err;
1751 }
1752
1753 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1754                            symbol_filter_t filter)
1755 {
1756         int i, err = 0;
1757         char *filename;
1758
1759         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1760                  vmlinux_path__nr_entries + 1);
1761
1762         filename = dso__build_id_filename(self, NULL, 0);
1763         if (filename != NULL) {
1764                 err = dso__load_vmlinux(self, map, filename, filter);
1765                 if (err > 0) {
1766                         dso__set_long_name(self, filename);
1767                         goto out;
1768                 }
1769                 free(filename);
1770         }
1771
1772         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1773                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1774                 if (err > 0) {
1775                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1776                         break;
1777                 }
1778         }
1779 out:
1780         return err;
1781 }
1782
1783 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1784                                 symbol_filter_t filter)
1785 {
1786         int err;
1787         const char *kallsyms_filename = NULL;
1788         char *kallsyms_allocated_filename = NULL;
1789         /*
1790          * Step 1: if the user specified a vmlinux filename, use it and only
1791          * it, reporting errors to the user if it cannot be used.
1792          *
1793          * For instance, try to analyse an ARM perf.data file _without_ a
1794          * build-id, or if the user specifies the wrong path to the right
1795          * vmlinux file, obviously we can't fallback to another vmlinux (a
1796          * x86_86 one, on the machine where analysis is being performed, say),
1797          * or worse, /proc/kallsyms.
1798          *
1799          * If the specified file _has_ a build-id and there is a build-id
1800          * section in the perf.data file, we will still do the expected
1801          * validation in dso__load_vmlinux and will bail out if they don't
1802          * match.
1803          */
1804         if (symbol_conf.vmlinux_name != NULL) {
1805                 err = dso__load_vmlinux(self, map,
1806                                         symbol_conf.vmlinux_name, filter);
1807                 if (err > 0) {
1808                         dso__set_long_name(self,
1809                                            strdup(symbol_conf.vmlinux_name));
1810                         goto out_fixup;
1811                 }
1812                 return err;
1813         }
1814
1815         if (vmlinux_path != NULL) {
1816                 err = dso__load_vmlinux_path(self, map, filter);
1817                 if (err > 0)
1818                         goto out_fixup;
1819         }
1820
1821         /*
1822          * Say the kernel DSO was created when processing the build-id header table,
1823          * we have a build-id, so check if it is the same as the running kernel,
1824          * using it if it is.
1825          */
1826         if (self->has_build_id) {
1827                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1828                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1829
1830                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1831                                          sizeof(kallsyms_build_id)) == 0) {
1832                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1833                                 kallsyms_filename = "/proc/kallsyms";
1834                                 goto do_kallsyms;
1835                         }
1836                 }
1837                 /*
1838                  * Now look if we have it on the build-id cache in
1839                  * $HOME/.debug/[kernel.kallsyms].
1840                  */
1841                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1842                                   sbuild_id);
1843
1844                 if (asprintf(&kallsyms_allocated_filename,
1845                              "%s/.debug/[kernel.kallsyms]/%s",
1846                              getenv("HOME"), sbuild_id) == -1) {
1847                         pr_err("Not enough memory for kallsyms file lookup\n");
1848                         return -1;
1849                 }
1850
1851                 kallsyms_filename = kallsyms_allocated_filename;
1852
1853                 if (access(kallsyms_filename, F_OK)) {
1854                         pr_err("No kallsyms or vmlinux with build-id %s "
1855                                "was found\n", sbuild_id);
1856                         free(kallsyms_allocated_filename);
1857                         return -1;
1858                 }
1859         } else {
1860                 /*
1861                  * Last resort, if we don't have a build-id and couldn't find
1862                  * any vmlinux file, try the running kernel kallsyms table.
1863                  */
1864                 kallsyms_filename = "/proc/kallsyms";
1865         }
1866
1867 do_kallsyms:
1868         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1869         if (err > 0)
1870                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1871         free(kallsyms_allocated_filename);
1872
1873         if (err > 0) {
1874 out_fixup:
1875                 if (kallsyms_filename != NULL)
1876                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1877                 map__fixup_start(map);
1878                 map__fixup_end(map);
1879         }
1880
1881         return err;
1882 }
1883
1884 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1885                                 symbol_filter_t filter)
1886 {
1887         int err;
1888         const char *kallsyms_filename = NULL;
1889         struct machine *machine;
1890         char path[PATH_MAX];
1891
1892         if (!map->groups) {
1893                 pr_debug("Guest kernel map hasn't the point to groups\n");
1894                 return -1;
1895         }
1896         machine = map->groups->machine;
1897
1898         if (machine__is_default_guest(machine)) {
1899                 /*
1900                  * if the user specified a vmlinux filename, use it and only
1901                  * it, reporting errors to the user if it cannot be used.
1902                  * Or use file guest_kallsyms inputted by user on commandline
1903                  */
1904                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1905                         err = dso__load_vmlinux(self, map,
1906                                 symbol_conf.default_guest_vmlinux_name, filter);
1907                         goto out_try_fixup;
1908                 }
1909
1910                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1911                 if (!kallsyms_filename)
1912                         return -1;
1913         } else {
1914                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1915                 kallsyms_filename = path;
1916         }
1917
1918         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1919         if (err > 0)
1920                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1921
1922 out_try_fixup:
1923         if (err > 0) {
1924                 if (kallsyms_filename != NULL) {
1925                         machine__mmap_name(machine, path, sizeof(path));
1926                         dso__set_long_name(self, strdup(path));
1927                 }
1928                 map__fixup_start(map);
1929                 map__fixup_end(map);
1930         }
1931
1932         return err;
1933 }
1934
1935 static void dsos__add(struct list_head *head, struct dso *dso)
1936 {
1937         list_add_tail(&dso->node, head);
1938 }
1939
1940 static struct dso *dsos__find(struct list_head *head, const char *name)
1941 {
1942         struct dso *pos;
1943
1944         list_for_each_entry(pos, head, node)
1945                 if (strcmp(pos->long_name, name) == 0)
1946                         return pos;
1947         return NULL;
1948 }
1949
1950 struct dso *__dsos__findnew(struct list_head *head, const char *name)
1951 {
1952         struct dso *dso = dsos__find(head, name);
1953
1954         if (!dso) {
1955                 dso = dso__new(name);
1956                 if (dso != NULL) {
1957                         dsos__add(head, dso);
1958                         dso__set_basename(dso);
1959                 }
1960         }
1961
1962         return dso;
1963 }
1964
1965 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
1966 {
1967         struct dso *pos;
1968         size_t ret = 0;
1969
1970         list_for_each_entry(pos, head, node) {
1971                 int i;
1972                 for (i = 0; i < MAP__NR_TYPES; ++i)
1973                         ret += dso__fprintf(pos, i, fp);
1974         }
1975
1976         return ret;
1977 }
1978
1979 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
1980 {
1981         struct rb_node *nd;
1982         size_t ret = 0;
1983
1984         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
1985                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1986                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
1987                 ret += __dsos__fprintf(&pos->user_dsos, fp);
1988         }
1989
1990         return ret;
1991 }
1992
1993 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
1994                                       bool with_hits)
1995 {
1996         struct dso *pos;
1997         size_t ret = 0;
1998
1999         list_for_each_entry(pos, head, node) {
2000                 if (with_hits && !pos->hit)
2001                         continue;
2002                 ret += dso__fprintf_buildid(pos, fp);
2003                 ret += fprintf(fp, " %s\n", pos->long_name);
2004         }
2005         return ret;
2006 }
2007
2008 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2009 {
2010         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2011                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2012 }
2013
2014 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2015 {
2016         struct rb_node *nd;
2017         size_t ret = 0;
2018
2019         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2020                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2021                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2022         }
2023         return ret;
2024 }
2025
2026 struct dso *dso__new_kernel(const char *name)
2027 {
2028         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2029
2030         if (self != NULL) {
2031                 dso__set_short_name(self, "[kernel]");
2032                 self->kernel = DSO_TYPE_KERNEL;
2033         }
2034
2035         return self;
2036 }
2037
2038 static struct dso *dso__new_guest_kernel(struct machine *machine,
2039                                         const char *name)
2040 {
2041         char bf[PATH_MAX];
2042         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2043
2044         if (self != NULL) {
2045                 dso__set_short_name(self, "[guest.kernel]");
2046                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2047         }
2048
2049         return self;
2050 }
2051
2052 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2053 {
2054         char path[PATH_MAX];
2055
2056         if (machine__is_default_guest(machine))
2057                 return;
2058         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2059         if (sysfs__read_build_id(path, self->build_id,
2060                                  sizeof(self->build_id)) == 0)
2061                 self->has_build_id = true;
2062 }
2063
2064 static struct dso *machine__create_kernel(struct machine *self)
2065 {
2066         const char *vmlinux_name = NULL;
2067         struct dso *kernel;
2068
2069         if (machine__is_host(self)) {
2070                 vmlinux_name = symbol_conf.vmlinux_name;
2071                 kernel = dso__new_kernel(vmlinux_name);
2072         } else {
2073                 if (machine__is_default_guest(self))
2074                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2075                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2076         }
2077
2078         if (kernel != NULL) {
2079                 dso__read_running_kernel_build_id(kernel, self);
2080                 dsos__add(&self->kernel_dsos, kernel);
2081         }
2082         return kernel;
2083 }
2084
2085 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2086 {
2087         enum map_type type;
2088
2089         for (type = 0; type < MAP__NR_TYPES; ++type) {
2090                 struct kmap *kmap;
2091
2092                 self->vmlinux_maps[type] = map__new2(0, kernel, type);
2093                 if (self->vmlinux_maps[type] == NULL)
2094                         return -1;
2095
2096                 self->vmlinux_maps[type]->map_ip =
2097                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2098
2099                 kmap = map__kmap(self->vmlinux_maps[type]);
2100                 kmap->kmaps = &self->kmaps;
2101                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2102         }
2103
2104         return 0;
2105 }
2106
2107 int machine__create_kernel_maps(struct machine *self)
2108 {
2109         struct dso *kernel = machine__create_kernel(self);
2110
2111         if (kernel == NULL ||
2112             __machine__create_kernel_maps(self, kernel) < 0)
2113                 return -1;
2114
2115         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2116                 pr_debug("Problems creating module maps, continuing anyway...\n");
2117         /*
2118          * Now that we have all the maps created, just set the ->end of them:
2119          */
2120         map_groups__fixup_end(&self->kmaps);
2121         return 0;
2122 }
2123
2124 static void vmlinux_path__exit(void)
2125 {
2126         while (--vmlinux_path__nr_entries >= 0) {
2127                 free(vmlinux_path[vmlinux_path__nr_entries]);
2128                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2129         }
2130
2131         free(vmlinux_path);
2132         vmlinux_path = NULL;
2133 }
2134
2135 static int vmlinux_path__init(void)
2136 {
2137         struct utsname uts;
2138         char bf[PATH_MAX];
2139
2140         if (uname(&uts) < 0)
2141                 return -1;
2142
2143         vmlinux_path = malloc(sizeof(char *) * 5);
2144         if (vmlinux_path == NULL)
2145                 return -1;
2146
2147         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2148         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2149                 goto out_fail;
2150         ++vmlinux_path__nr_entries;
2151         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2152         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2153                 goto out_fail;
2154         ++vmlinux_path__nr_entries;
2155         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2156         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2157         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2158                 goto out_fail;
2159         ++vmlinux_path__nr_entries;
2160         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2161         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2162         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2163                 goto out_fail;
2164         ++vmlinux_path__nr_entries;
2165         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2166                  uts.release);
2167         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2168         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2169                 goto out_fail;
2170         ++vmlinux_path__nr_entries;
2171
2172         return 0;
2173
2174 out_fail:
2175         vmlinux_path__exit();
2176         return -1;
2177 }
2178
2179 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2180 {
2181         int i;
2182         size_t printed = 0;
2183         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2184
2185         if (kdso->has_build_id) {
2186                 char filename[PATH_MAX];
2187                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2188                         printed += fprintf(fp, "[0] %s\n", filename);
2189         }
2190
2191         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2192                 printed += fprintf(fp, "[%d] %s\n",
2193                                    i + kdso->has_build_id, vmlinux_path[i]);
2194
2195         return printed;
2196 }
2197
2198 static int setup_list(struct strlist **list, const char *list_str,
2199                       const char *list_name)
2200 {
2201         if (list_str == NULL)
2202                 return 0;
2203
2204         *list = strlist__new(true, list_str);
2205         if (!*list) {
2206                 pr_err("problems parsing %s list\n", list_name);
2207                 return -1;
2208         }
2209         return 0;
2210 }
2211
2212 int symbol__init(void)
2213 {
2214         elf_version(EV_CURRENT);
2215         if (symbol_conf.sort_by_name)
2216                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2217                                           sizeof(struct symbol));
2218
2219         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2220                 return -1;
2221
2222         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2223                 pr_err("'.' is the only non valid --field-separator argument\n");
2224                 return -1;
2225         }
2226
2227         if (setup_list(&symbol_conf.dso_list,
2228                        symbol_conf.dso_list_str, "dso") < 0)
2229                 return -1;
2230
2231         if (setup_list(&symbol_conf.comm_list,
2232                        symbol_conf.comm_list_str, "comm") < 0)
2233                 goto out_free_dso_list;
2234
2235         if (setup_list(&symbol_conf.sym_list,
2236                        symbol_conf.sym_list_str, "symbol") < 0)
2237                 goto out_free_comm_list;
2238
2239         return 0;
2240
2241 out_free_dso_list:
2242         strlist__delete(symbol_conf.dso_list);
2243 out_free_comm_list:
2244         strlist__delete(symbol_conf.comm_list);
2245         return -1;
2246 }
2247
2248 void symbol__exit(void)
2249 {
2250         strlist__delete(symbol_conf.sym_list);
2251         strlist__delete(symbol_conf.dso_list);
2252         strlist__delete(symbol_conf.comm_list);
2253         vmlinux_path__exit();
2254         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2255 }
2256
2257 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2258 {
2259         struct machine *machine = machines__findnew(self, pid);
2260
2261         if (machine == NULL)
2262                 return -1;
2263
2264         return machine__create_kernel_maps(machine);
2265 }
2266
2267 static int hex(char ch)
2268 {
2269         if ((ch >= '0') && (ch <= '9'))
2270                 return ch - '0';
2271         if ((ch >= 'a') && (ch <= 'f'))
2272                 return ch - 'a' + 10;
2273         if ((ch >= 'A') && (ch <= 'F'))
2274                 return ch - 'A' + 10;
2275         return -1;
2276 }
2277
2278 /*
2279  * While we find nice hex chars, build a long_val.
2280  * Return number of chars processed.
2281  */
2282 int hex2u64(const char *ptr, u64 *long_val)
2283 {
2284         const char *p = ptr;
2285         *long_val = 0;
2286
2287         while (*p) {
2288                 const int hex_val = hex(*p);
2289
2290                 if (hex_val < 0)
2291                         break;
2292
2293                 *long_val = (*long_val << 4) | hex_val;
2294                 p++;
2295         }
2296
2297         return p - ptr;
2298 }
2299
2300 char *strxfrchar(char *s, char from, char to)
2301 {
2302         char *p = s;
2303
2304         while ((p = strchr(p, from)) != NULL)
2305                 *p++ = to;
2306
2307         return s;
2308 }
2309
2310 int machines__create_guest_kernel_maps(struct rb_root *self)
2311 {
2312         int ret = 0;
2313         struct dirent **namelist = NULL;
2314         int i, items = 0;
2315         char path[PATH_MAX];
2316         pid_t pid;
2317
2318         if (symbol_conf.default_guest_vmlinux_name ||
2319             symbol_conf.default_guest_modules ||
2320             symbol_conf.default_guest_kallsyms) {
2321                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2322         }
2323
2324         if (symbol_conf.guestmount) {
2325                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2326                 if (items <= 0)
2327                         return -ENOENT;
2328                 for (i = 0; i < items; i++) {
2329                         if (!isdigit(namelist[i]->d_name[0])) {
2330                                 /* Filter out . and .. */
2331                                 continue;
2332                         }
2333                         pid = atoi(namelist[i]->d_name);
2334                         sprintf(path, "%s/%s/proc/kallsyms",
2335                                 symbol_conf.guestmount,
2336                                 namelist[i]->d_name);
2337                         ret = access(path, R_OK);
2338                         if (ret) {
2339                                 pr_debug("Can't access file %s\n", path);
2340                                 goto failure;
2341                         }
2342                         machines__create_kernel_maps(self, pid);
2343                 }
2344 failure:
2345                 free(namelist);
2346         }
2347
2348         return ret;
2349 }
2350
2351 int machine__load_kallsyms(struct machine *self, const char *filename,
2352                            enum map_type type, symbol_filter_t filter)
2353 {
2354         struct map *map = self->vmlinux_maps[type];
2355         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2356
2357         if (ret > 0) {
2358                 dso__set_loaded(map->dso, type);
2359                 /*
2360                  * Since /proc/kallsyms will have multiple sessions for the
2361                  * kernel, with modules between them, fixup the end of all
2362                  * sections.
2363                  */
2364                 __map_groups__fixup_end(&self->kmaps, type);
2365         }
2366
2367         return ret;
2368 }
2369
2370 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2371                                symbol_filter_t filter)
2372 {
2373         struct map *map = self->vmlinux_maps[type];
2374         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2375
2376         if (ret > 0) {
2377                 dso__set_loaded(map->dso, type);
2378                 map__reloc_vmlinux(map);
2379         }
2380
2381         return ret;
2382 }