tools/perf/util/symbol.c

   1 #include <dirent.h>
   2 #include <errno.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <sys/param.h>
   9 #include <fcntl.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12 #include "build-id.h"
  13 #include "util.h"
  14 #include "debug.h"
  15 #include "machine.h"
  16 #include "symbol.h"
  17 #include "strlist.h"
  18 #include "intlist.h"
  19 #include "header.h"
  20
  21 #include <elf.h>
  22 #include <limits.h>
  23 #include <symbol/kallsyms.h>
  24 #include <sys/utsname.h>
  25
  26 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
  27                                 symbol_filter_t filter);
  28 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
  29                         symbol_filter_t filter);
  30 int vmlinux_path__nr_entries;
  31 char **vmlinux_path;
  32
  33 struct symbol_conf symbol_conf = {
  34         .use_modules            = true,
  35         .try_vmlinux_path       = true,
  36         .annotate_src           = true,
  37         .demangle               = true,
  38         .demangle_kernel        = false,
  39         .cumulate_callchain     = true,
  40         .show_hist_headers      = true,
  41         .symfs                  = "",
  42 };
  43
  44 static enum dso_binary_type binary_type_symtab[] = {
  45         DSO_BINARY_TYPE__KALLSYMS,
  46         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  47         DSO_BINARY_TYPE__JAVA_JIT,
  48         DSO_BINARY_TYPE__DEBUGLINK,
  49         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  50         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  51         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  52         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  53         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  54         DSO_BINARY_TYPE__GUEST_KMODULE,
  55         DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  56         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  57         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  58         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  59         DSO_BINARY_TYPE__NOT_FOUND,
  60 };
  61
  62 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  63
  64 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  65 {
  66         symbol_type = toupper(symbol_type);
  67
  68         switch (map_type) {
  69         case MAP__FUNCTION:
  70                 return symbol_type == 'T' || symbol_type == 'W';
  71         case MAP__VARIABLE:
  72                 return symbol_type == 'D';
  73         default:
  74                 return false;
  75         }
  76 }
  77
  78 static int prefix_underscores_count(const char *str)
  79 {
  80         const char *tail = str;
  81
  82         while (*tail == '_')
  83                 tail++;
  84
  85         return tail - str;
  86 }
  87
  88 int __weak arch__choose_best_symbol(struct symbol *syma,
  89                                     struct symbol *symb __maybe_unused)
  90 {
  91         /* Avoid "SyS" kernel syscall aliases */
  92         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
  93                 return SYMBOL_B;
  94         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
  95                 return SYMBOL_B;
  96
  97         return SYMBOL_A;
  98 }
  99
 100 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 101 {
 102         s64 a;
 103         s64 b;
 104         size_t na, nb;
 105
 106         /* Prefer a symbol with non zero length */
 107         a = syma->end - syma->start;
 108         b = symb->end - symb->start;
 109         if ((b == 0) && (a > 0))
 110                 return SYMBOL_A;
 111         else if ((a == 0) && (b > 0))
 112                 return SYMBOL_B;
 113
 114         /* Prefer a non weak symbol over a weak one */
 115         a = syma->binding == STB_WEAK;
 116         b = symb->binding == STB_WEAK;
 117         if (b && !a)
 118                 return SYMBOL_A;
 119         if (a && !b)
 120                 return SYMBOL_B;
 121
 122         /* Prefer a global symbol over a non global one */
 123         a = syma->binding == STB_GLOBAL;
 124         b = symb->binding == STB_GLOBAL;
 125         if (a && !b)
 126                 return SYMBOL_A;
 127         if (b && !a)
 128                 return SYMBOL_B;
 129
 130         /* Prefer a symbol with less underscores */
 131         a = prefix_underscores_count(syma->name);
 132         b = prefix_underscores_count(symb->name);
 133         if (b > a)
 134                 return SYMBOL_A;
 135         else if (a > b)
 136                 return SYMBOL_B;
 137
 138         /* Choose the symbol with the longest name */
 139         na = strlen(syma->name);
 140         nb = strlen(symb->name);
 141         if (na > nb)
 142                 return SYMBOL_A;
 143         else if (na < nb)
 144                 return SYMBOL_B;
 145
 146         return arch__choose_best_symbol(syma, symb);
 147 }
 148
 149 void symbols__fixup_duplicate(struct rb_root *symbols)
 150 {
 151         struct rb_node *nd;
 152         struct symbol *curr, *next;
 153
 154         nd = rb_first(symbols);
 155
 156         while (nd) {
 157                 curr = rb_entry(nd, struct symbol, rb_node);
 158 again:
 159                 nd = rb_next(&curr->rb_node);
 160                 next = rb_entry(nd, struct symbol, rb_node);
 161
 162                 if (!nd)
 163                         break;
 164
 165                 if (curr->start != next->start)
 166                         continue;
 167
 168                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 169                         rb_erase(&next->rb_node, symbols);
 170                         symbol__delete(next);
 171                         goto again;
 172                 } else {
 173                         nd = rb_next(&curr->rb_node);
 174                         rb_erase(&curr->rb_node, symbols);
 175                         symbol__delete(curr);
 176                 }
 177         }
 178 }
 179
 180 void symbols__fixup_end(struct rb_root *symbols)
 181 {
 182         struct rb_node *nd, *prevnd = rb_first(symbols);
 183         struct symbol *curr, *prev;
 184
 185         if (prevnd == NULL)
 186                 return;
 187
 188         curr = rb_entry(prevnd, struct symbol, rb_node);
 189
 190         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 191                 prev = curr;
 192                 curr = rb_entry(nd, struct symbol, rb_node);
 193
 194                 if (prev->end == prev->start && prev->end != curr->start)
 195                         prev->end = curr->start;
 196         }
 197
 198         /* Last entry */
 199         if (curr->end == curr->start)
 200                 curr->end = roundup(curr->start, 4096);
 201 }
 202
 203 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 204 {
 205         struct maps *maps = &mg->maps[type];
 206         struct map *next, *curr;
 207
 208         pthread_rwlock_wrlock(&maps->lock);
 209
 210         curr = maps__first(maps);
 211         if (curr == NULL)
 212                 goto out_unlock;
 213
 214         for (next = map__next(curr); next; next = map__next(curr)) {
 215                 curr->end = next->start;
 216                 curr = next;
 217         }
 218
 219         /*
 220          * We still haven't the actual symbols, so guess the
 221          * last map final address.
 222          */
 223         curr->end = ~0ULL;
 224
 225 out_unlock:
 226         pthread_rwlock_unlock(&maps->lock);
 227 }
 228
 229 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 230 {
 231         size_t namelen = strlen(name) + 1;
 232         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 233                                         sizeof(*sym) + namelen));
 234         if (sym == NULL)
 235                 return NULL;
 236
 237         if (symbol_conf.priv_size)
 238                 sym = ((void *)sym) + symbol_conf.priv_size;
 239
 240         sym->start   = start;
 241         sym->end     = len ? start + len : start;
 242         sym->binding = binding;
 243         sym->namelen = namelen - 1;
 244
 245         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 246                   __func__, name, start, sym->end);
 247         memcpy(sym->name, name, namelen);
 248
 249         return sym;
 250 }
 251
 252 void symbol__delete(struct symbol *sym)
 253 {
 254         free(((void *)sym) - symbol_conf.priv_size);
 255 }
 256
 257 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
 258 {
 259         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
 260                        sym->start, sym->end,
 261                        sym->binding == STB_GLOBAL ? 'g' :
 262                        sym->binding == STB_LOCAL  ? 'l' : 'w',
 263                        sym->name);
 264 }
 265
 266 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 267                                     const struct addr_location *al, FILE *fp)
 268 {
 269         unsigned long offset;
 270         size_t length;
 271
 272         if (sym && sym->name) {
 273                 length = fprintf(fp, "%s", sym->name);
 274                 if (al) {
 275                         if (al->addr < sym->end)
 276                                 offset = al->addr - sym->start;
 277                         else
 278                                 offset = al->addr - al->map->start - sym->start;
 279                         length += fprintf(fp, "+0x%lx", offset);
 280                 }
 281                 return length;
 282         } else
 283                 return fprintf(fp, "[unknown]");
 284 }
 285
 286 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
 287 {
 288         return symbol__fprintf_symname_offs(sym, NULL, fp);
 289 }
 290
 291 void symbols__delete(struct rb_root *symbols)
 292 {
 293         struct symbol *pos;
 294         struct rb_node *next = rb_first(symbols);
 295
 296         while (next) {
 297                 pos = rb_entry(next, struct symbol, rb_node);
 298                 next = rb_next(&pos->rb_node);
 299                 rb_erase(&pos->rb_node, symbols);
 300                 symbol__delete(pos);
 301         }
 302 }
 303
 304 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 305 {
 306         struct rb_node **p = &symbols->rb_node;
 307         struct rb_node *parent = NULL;
 308         const u64 ip = sym->start;
 309         struct symbol *s;
 310
 311         while (*p != NULL) {
 312                 parent = *p;
 313                 s = rb_entry(parent, struct symbol, rb_node);
 314                 if (ip < s->start)
 315                         p = &(*p)->rb_left;
 316                 else
 317                         p = &(*p)->rb_right;
 318         }
 319         rb_link_node(&sym->rb_node, parent, p);
 320         rb_insert_color(&sym->rb_node, symbols);
 321 }
 322
 323 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
 324 {
 325         struct rb_node *n;
 326
 327         if (symbols == NULL)
 328                 return NULL;
 329
 330         n = symbols->rb_node;
 331
 332         while (n) {
 333                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 334
 335                 if (ip < s->start)
 336                         n = n->rb_left;
 337                 else if (ip >= s->end)
 338                         n = n->rb_right;
 339                 else
 340                         return s;
 341         }
 342
 343         return NULL;
 344 }
 345
 346 static struct symbol *symbols__first(struct rb_root *symbols)
 347 {
 348         struct rb_node *n = rb_first(symbols);
 349
 350         if (n)
 351                 return rb_entry(n, struct symbol, rb_node);
 352
 353         return NULL;
 354 }
 355
 356 static struct symbol *symbols__next(struct symbol *sym)
 357 {
 358         struct rb_node *n = rb_next(&sym->rb_node);
 359
 360         if (n)
 361                 return rb_entry(n, struct symbol, rb_node);
 362
 363         return NULL;
 364 }
 365
 366 struct symbol_name_rb_node {
 367         struct rb_node  rb_node;
 368         struct symbol   sym;
 369 };
 370
 371 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
 372 {
 373         struct rb_node **p = &symbols->rb_node;
 374         struct rb_node *parent = NULL;
 375         struct symbol_name_rb_node *symn, *s;
 376
 377         symn = container_of(sym, struct symbol_name_rb_node, sym);
 378
 379         while (*p != NULL) {
 380                 parent = *p;
 381                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 382                 if (strcmp(sym->name, s->sym.name) < 0)
 383                         p = &(*p)->rb_left;
 384                 else
 385                         p = &(*p)->rb_right;
 386         }
 387         rb_link_node(&symn->rb_node, parent, p);
 388         rb_insert_color(&symn->rb_node, symbols);
 389 }
 390
 391 static void symbols__sort_by_name(struct rb_root *symbols,
 392                                   struct rb_root *source)
 393 {
 394         struct rb_node *nd;
 395
 396         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 397                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 398                 symbols__insert_by_name(symbols, pos);
 399         }
 400 }
 401
 402 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
 403                                             const char *name)
 404 {
 405         struct rb_node *n;
 406         struct symbol_name_rb_node *s = NULL;
 407
 408         if (symbols == NULL)
 409                 return NULL;
 410
 411         n = symbols->rb_node;
 412
 413         while (n) {
 414                 int cmp;
 415
 416                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 417                 cmp = arch__compare_symbol_names(name, s->sym.name);
 418
 419                 if (cmp < 0)
 420                         n = n->rb_left;
 421                 else if (cmp > 0)
 422                         n = n->rb_right;
 423                 else
 424                         break;
 425         }
 426
 427         if (n == NULL)
 428                 return NULL;
 429
 430         /* return first symbol that has same name (if any) */
 431         for (n = rb_prev(n); n; n = rb_prev(n)) {
 432                 struct symbol_name_rb_node *tmp;
 433
 434                 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 435                 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
 436                         break;
 437
 438                 s = tmp;
 439         }
 440
 441         return &s->sym;
 442 }
 443
 444 void dso__reset_find_symbol_cache(struct dso *dso)
 445 {
 446         enum map_type type;
 447
 448         for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) {
 449                 dso->last_find_result[type].addr   = 0;
 450                 dso->last_find_result[type].symbol = NULL;
 451         }
 452 }
 453
 454 struct symbol *dso__find_symbol(struct dso *dso,
 455                                 enum map_type type, u64 addr)
 456 {
 457         if (dso->last_find_result[type].addr != addr) {
 458                 dso->last_find_result[type].addr   = addr;
 459                 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr);
 460         }
 461
 462         return dso->last_find_result[type].symbol;
 463 }
 464
 465 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 466 {
 467         return symbols__first(&dso->symbols[type]);
 468 }
 469
 470 struct symbol *dso__next_symbol(struct symbol *sym)
 471 {
 472         return symbols__next(sym);
 473 }
 474
 475 struct symbol *symbol__next_by_name(struct symbol *sym)
 476 {
 477         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 478         struct rb_node *n = rb_next(&s->rb_node);
 479
 480         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 481 }
 482
 483  /*
 484   * Teturns first symbol that matched with @name.
 485   */
 486 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 487                                         const char *name)
 488 {
 489         return symbols__find_by_name(&dso->symbol_names[type], name);
 490 }
 491
 492 void dso__sort_by_name(struct dso *dso, enum map_type type)
 493 {
 494         dso__set_sorted_by_name(dso, type);
 495         return symbols__sort_by_name(&dso->symbol_names[type],
 496                                      &dso->symbols[type]);
 497 }
 498
 499 size_t dso__fprintf_symbols_by_name(struct dso *dso,
 500                                     enum map_type type, FILE *fp)
 501 {
 502         size_t ret = 0;
 503         struct rb_node *nd;
 504         struct symbol_name_rb_node *pos;
 505
 506         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
 507                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 508                 fprintf(fp, "%s\n", pos->sym.name);
 509         }
 510
 511         return ret;
 512 }
 513
 514 int modules__parse(const char *filename, void *arg,
 515                    int (*process_module)(void *arg, const char *name,
 516                                          u64 start))
 517 {
 518         char *line = NULL;
 519         size_t n;
 520         FILE *file;
 521         int err = 0;
 522
 523         file = fopen(filename, "r");
 524         if (file == NULL)
 525                 return -1;
 526
 527         while (1) {
 528                 char name[PATH_MAX];
 529                 u64 start;
 530                 char *sep;
 531                 ssize_t line_len;
 532
 533                 line_len = getline(&line, &n, file);
 534                 if (line_len < 0) {
 535                         if (feof(file))
 536                                 break;
 537                         err = -1;
 538                         goto out;
 539                 }
 540
 541                 if (!line) {
 542                         err = -1;
 543                         goto out;
 544                 }
 545
 546                 line[--line_len] = '\0'; /* \n */
 547
 548                 sep = strrchr(line, 'x');
 549                 if (sep == NULL)
 550                         continue;
 551
 552                 hex2u64(sep + 1, &start);
 553
 554                 sep = strchr(line, ' ');
 555                 if (sep == NULL)
 556                         continue;
 557
 558                 *sep = '\0';
 559
 560                 scnprintf(name, sizeof(name), "[%s]", line);
 561
 562                 err = process_module(arg, name, start);
 563                 if (err)
 564                         break;
 565         }
 566 out:
 567         free(line);
 568         fclose(file);
 569         return err;
 570 }
 571
 572 struct process_kallsyms_args {
 573         struct map *map;
 574         struct dso *dso;
 575 };
 576
 577 /*
 578  * These are symbols in the kernel image, so make sure that
 579  * sym is from a kernel DSO.
 580  */
 581 bool symbol__is_idle(struct symbol *sym)
 582 {
 583         const char * const idle_symbols[] = {
 584                 "cpu_idle",
 585                 "cpu_startup_entry",
 586                 "intel_idle",
 587                 "default_idle",
 588                 "native_safe_halt",
 589                 "enter_idle",
 590                 "exit_idle",
 591                 "mwait_idle",
 592                 "mwait_idle_with_hints",
 593                 "poll_idle",
 594                 "ppc64_runlatch_off",
 595                 "pseries_dedicated_idle_sleep",
 596                 NULL
 597         };
 598
 599         int i;
 600
 601         if (!sym)
 602                 return false;
 603
 604         for (i = 0; idle_symbols[i]; i++) {
 605                 if (!strcmp(idle_symbols[i], sym->name))
 606                         return true;
 607         }
 608
 609         return false;
 610 }
 611
 612 static int map__process_kallsym_symbol(void *arg, const char *name,
 613                                        char type, u64 start)
 614 {
 615         struct symbol *sym;
 616         struct process_kallsyms_args *a = arg;
 617         struct rb_root *root = &a->dso->symbols[a->map->type];
 618
 619         if (!symbol_type__is_a(type, a->map->type))
 620                 return 0;
 621
 622         /*
 623          * module symbols are not sorted so we add all
 624          * symbols, setting length to 0, and rely on
 625          * symbols__fixup_end() to fix it up.
 626          */
 627         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
 628         if (sym == NULL)
 629                 return -ENOMEM;
 630         /*
 631          * We will pass the symbols to the filter later, in
 632          * map__split_kallsyms, when we have split the maps per module
 633          */
 634         symbols__insert(root, sym);
 635
 636         return 0;
 637 }
 638
 639 /*
 640  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 641  * so that we can in the next step set the symbol ->end address and then
 642  * call kernel_maps__split_kallsyms.
 643  */
 644 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 645                                   struct map *map)
 646 {
 647         struct process_kallsyms_args args = { .map = map, .dso = dso, };
 648         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 649 }
 650
 651 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
 652                                          symbol_filter_t filter)
 653 {
 654         struct map_groups *kmaps = map__kmaps(map);
 655         struct map *curr_map;
 656         struct symbol *pos;
 657         int count = 0, moved = 0;
 658         struct rb_root *root = &dso->symbols[map->type];
 659         struct rb_node *next = rb_first(root);
 660
 661         if (!kmaps)
 662                 return -1;
 663
 664         while (next) {
 665                 char *module;
 666
 667                 pos = rb_entry(next, struct symbol, rb_node);
 668                 next = rb_next(&pos->rb_node);
 669
 670                 module = strchr(pos->name, '\t');
 671                 if (module)
 672                         *module = '\0';
 673
 674                 curr_map = map_groups__find(kmaps, map->type, pos->start);
 675
 676                 if (!curr_map || (filter && filter(curr_map, pos))) {
 677                         rb_erase_init(&pos->rb_node, root);
 678                         symbol__delete(pos);
 679                 } else {
 680                         pos->start -= curr_map->start - curr_map->pgoff;
 681                         if (pos->end)
 682                                 pos->end -= curr_map->start - curr_map->pgoff;
 683                         if (curr_map != map) {
 684                                 rb_erase_init(&pos->rb_node, root);
 685                                 symbols__insert(
 686                                         &curr_map->dso->symbols[curr_map->type],
 687                                         pos);
 688                                 ++moved;
 689                         } else {
 690                                 ++count;
 691                         }
 692                 }
 693         }
 694
 695         /* Symbols have been adjusted */
 696         dso->adjust_symbols = 1;
 697
 698         return count + moved;
 699 }
 700
 701 /*
 702  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 703  * kernel range is broken in several maps, named [kernel].N, as we don't have
 704  * the original ELF section names vmlinux have.
 705  */
 706 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
 707                                symbol_filter_t filter)
 708 {
 709         struct map_groups *kmaps = map__kmaps(map);
 710         struct machine *machine;
 711         struct map *curr_map = map;
 712         struct symbol *pos;
 713         int count = 0, moved = 0;
 714         struct rb_root *root = &dso->symbols[map->type];
 715         struct rb_node *next = rb_first(root);
 716         int kernel_range = 0;
 717
 718         if (!kmaps)
 719                 return -1;
 720
 721         machine = kmaps->machine;
 722
 723         while (next) {
 724                 char *module;
 725
 726                 pos = rb_entry(next, struct symbol, rb_node);
 727                 next = rb_next(&pos->rb_node);
 728
 729                 module = strchr(pos->name, '\t');
 730                 if (module) {
 731                         if (!symbol_conf.use_modules)
 732                                 goto discard_symbol;
 733
 734                         *module++ = '\0';
 735
 736                         if (strcmp(curr_map->dso->short_name, module)) {
 737                                 if (curr_map != map &&
 738                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 739                                     machine__is_default_guest(machine)) {
 740                                         /*
 741                                          * We assume all symbols of a module are
 742                                          * continuous in * kallsyms, so curr_map
 743                                          * points to a module and all its
 744                                          * symbols are in its kmap. Mark it as
 745                                          * loaded.
 746                                          */
 747                                         dso__set_loaded(curr_map->dso,
 748                                                         curr_map->type);
 749                                 }
 750
 751                                 curr_map = map_groups__find_by_name(kmaps,
 752                                                         map->type, module);
 753                                 if (curr_map == NULL) {
 754                                         pr_debug("%s/proc/{kallsyms,modules} "
 755                                                  "inconsistency while looking "
 756                                                  "for \"%s\" module!\n",
 757                                                  machine->root_dir, module);
 758                                         curr_map = map;
 759                                         goto discard_symbol;
 760                                 }
 761
 762                                 if (curr_map->dso->loaded &&
 763                                     !machine__is_default_guest(machine))
 764                                         goto discard_symbol;
 765                         }
 766                         /*
 767                          * So that we look just like we get from .ko files,
 768                          * i.e. not prelinked, relative to map->start.
 769                          */
 770                         pos->start = curr_map->map_ip(curr_map, pos->start);
 771                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 772                 } else if (curr_map != map) {
 773                         char dso_name[PATH_MAX];
 774                         struct dso *ndso;
 775
 776                         if (delta) {
 777                                 /* Kernel was relocated at boot time */
 778                                 pos->start -= delta;
 779                                 pos->end -= delta;
 780                         }
 781
 782                         if (count == 0) {
 783                                 curr_map = map;
 784                                 goto filter_symbol;
 785                         }
 786
 787                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 788                                 snprintf(dso_name, sizeof(dso_name),
 789                                         "[guest.kernel].%d",
 790                                         kernel_range++);
 791                         else
 792                                 snprintf(dso_name, sizeof(dso_name),
 793                                         "[kernel].%d",
 794                                         kernel_range++);
 795
 796                         ndso = dso__new(dso_name);
 797                         if (ndso == NULL)
 798                                 return -1;
 799
 800                         ndso->kernel = dso->kernel;
 801
 802                         curr_map = map__new2(pos->start, ndso, map->type);
 803                         if (curr_map == NULL) {
 804                                 dso__put(ndso);
 805                                 return -1;
 806                         }
 807
 808                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 809                         map_groups__insert(kmaps, curr_map);
 810                         ++kernel_range;
 811                 } else if (delta) {
 812                         /* Kernel was relocated at boot time */
 813                         pos->start -= delta;
 814                         pos->end -= delta;
 815                 }
 816 filter_symbol:
 817                 if (filter && filter(curr_map, pos)) {
 818 discard_symbol:         rb_erase(&pos->rb_node, root);
 819                         symbol__delete(pos);
 820                 } else {
 821                         if (curr_map != map) {
 822                                 rb_erase(&pos->rb_node, root);
 823                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 824                                 ++moved;
 825                         } else
 826                                 ++count;
 827                 }
 828         }
 829
 830         if (curr_map != map &&
 831             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 832             machine__is_default_guest(kmaps->machine)) {
 833                 dso__set_loaded(curr_map->dso, curr_map->type);
 834         }
 835
 836         return count + moved;
 837 }
 838
 839 bool symbol__restricted_filename(const char *filename,
 840                                  const char *restricted_filename)
 841 {
 842         bool restricted = false;
 843
 844         if (symbol_conf.kptr_restrict) {
 845                 char *r = realpath(filename, NULL);
 846
 847                 if (r != NULL) {
 848                         restricted = strcmp(r, restricted_filename) == 0;
 849                         free(r);
 850                         return restricted;
 851                 }
 852         }
 853
 854         return restricted;
 855 }
 856
 857 struct module_info {
 858         struct rb_node rb_node;
 859         char *name;
 860         u64 start;
 861 };
 862
 863 static void add_module(struct module_info *mi, struct rb_root *modules)
 864 {
 865         struct rb_node **p = &modules->rb_node;
 866         struct rb_node *parent = NULL;
 867         struct module_info *m;
 868
 869         while (*p != NULL) {
 870                 parent = *p;
 871                 m = rb_entry(parent, struct module_info, rb_node);
 872                 if (strcmp(mi->name, m->name) < 0)
 873                         p = &(*p)->rb_left;
 874                 else
 875                         p = &(*p)->rb_right;
 876         }
 877         rb_link_node(&mi->rb_node, parent, p);
 878         rb_insert_color(&mi->rb_node, modules);
 879 }
 880
 881 static void delete_modules(struct rb_root *modules)
 882 {
 883         struct module_info *mi;
 884         struct rb_node *next = rb_first(modules);
 885
 886         while (next) {
 887                 mi = rb_entry(next, struct module_info, rb_node);
 888                 next = rb_next(&mi->rb_node);
 889                 rb_erase(&mi->rb_node, modules);
 890                 zfree(&mi->name);
 891                 free(mi);
 892         }
 893 }
 894
 895 static struct module_info *find_module(const char *name,
 896                                        struct rb_root *modules)
 897 {
 898         struct rb_node *n = modules->rb_node;
 899
 900         while (n) {
 901                 struct module_info *m;
 902                 int cmp;
 903
 904                 m = rb_entry(n, struct module_info, rb_node);
 905                 cmp = strcmp(name, m->name);
 906                 if (cmp < 0)
 907                         n = n->rb_left;
 908                 else if (cmp > 0)
 909                         n = n->rb_right;
 910                 else
 911                         return m;
 912         }
 913
 914         return NULL;
 915 }
 916
 917 static int __read_proc_modules(void *arg, const char *name, u64 start)
 918 {
 919         struct rb_root *modules = arg;
 920         struct module_info *mi;
 921
 922         mi = zalloc(sizeof(struct module_info));
 923         if (!mi)
 924                 return -ENOMEM;
 925
 926         mi->name = strdup(name);
 927         mi->start = start;
 928
 929         if (!mi->name) {
 930                 free(mi);
 931                 return -ENOMEM;
 932         }
 933
 934         add_module(mi, modules);
 935
 936         return 0;
 937 }
 938
 939 static int read_proc_modules(const char *filename, struct rb_root *modules)
 940 {
 941         if (symbol__restricted_filename(filename, "/proc/modules"))
 942                 return -1;
 943
 944         if (modules__parse(filename, modules, __read_proc_modules)) {
 945                 delete_modules(modules);
 946                 return -1;
 947         }
 948
 949         return 0;
 950 }
 951
 952 int compare_proc_modules(const char *from, const char *to)
 953 {
 954         struct rb_root from_modules = RB_ROOT;
 955         struct rb_root to_modules = RB_ROOT;
 956         struct rb_node *from_node, *to_node;
 957         struct module_info *from_m, *to_m;
 958         int ret = -1;
 959
 960         if (read_proc_modules(from, &from_modules))
 961                 return -1;
 962
 963         if (read_proc_modules(to, &to_modules))
 964                 goto out_delete_from;
 965
 966         from_node = rb_first(&from_modules);
 967         to_node = rb_first(&to_modules);
 968         while (from_node) {
 969                 if (!to_node)
 970                         break;
 971
 972                 from_m = rb_entry(from_node, struct module_info, rb_node);
 973                 to_m = rb_entry(to_node, struct module_info, rb_node);
 974
 975                 if (from_m->start != to_m->start ||
 976                     strcmp(from_m->name, to_m->name))
 977                         break;
 978
 979                 from_node = rb_next(from_node);
 980                 to_node = rb_next(to_node);
 981         }
 982
 983         if (!from_node && !to_node)
 984                 ret = 0;
 985
 986         delete_modules(&to_modules);
 987 out_delete_from:
 988         delete_modules(&from_modules);
 989
 990         return ret;
 991 }
 992
 993 static int do_validate_kcore_modules(const char *filename, struct map *map,
 994                                   struct map_groups *kmaps)
 995 {
 996         struct rb_root modules = RB_ROOT;
 997         struct map *old_map;
 998         int err;
 999
1000         err = read_proc_modules(filename, &modules);
1001         if (err)
1002                 return err;
1003
1004         old_map = map_groups__first(kmaps, map->type);
1005         while (old_map) {
1006                 struct map *next = map_groups__next(old_map);
1007                 struct module_info *mi;
1008
1009                 if (old_map == map || old_map->start == map->start) {
1010                         /* The kernel map */
1011                         old_map = next;
1012                         continue;
1013                 }
1014
1015                 /* Module must be in memory at the same address */
1016                 mi = find_module(old_map->dso->short_name, &modules);
1017                 if (!mi || mi->start != old_map->start) {
1018                         err = -EINVAL;
1019                         goto out;
1020                 }
1021
1022                 old_map = next;
1023         }
1024 out:
1025         delete_modules(&modules);
1026         return err;
1027 }
1028
1029 /*
1030  * If kallsyms is referenced by name then we look for filename in the same
1031  * directory.
1032  */
1033 static bool filename_from_kallsyms_filename(char *filename,
1034                                             const char *base_name,
1035                                             const char *kallsyms_filename)
1036 {
1037         char *name;
1038
1039         strcpy(filename, kallsyms_filename);
1040         name = strrchr(filename, '/');
1041         if (!name)
1042                 return false;
1043
1044         name += 1;
1045
1046         if (!strcmp(name, "kallsyms")) {
1047                 strcpy(name, base_name);
1048                 return true;
1049         }
1050
1051         return false;
1052 }
1053
1054 static int validate_kcore_modules(const char *kallsyms_filename,
1055                                   struct map *map)
1056 {
1057         struct map_groups *kmaps = map__kmaps(map);
1058         char modules_filename[PATH_MAX];
1059
1060         if (!kmaps)
1061                 return -EINVAL;
1062
1063         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1064                                              kallsyms_filename))
1065                 return -EINVAL;
1066
1067         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1068                 return -EINVAL;
1069
1070         return 0;
1071 }
1072
1073 static int validate_kcore_addresses(const char *kallsyms_filename,
1074                                     struct map *map)
1075 {
1076         struct kmap *kmap = map__kmap(map);
1077
1078         if (!kmap)
1079                 return -EINVAL;
1080
1081         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1082                 u64 start;
1083
1084                 start = kallsyms__get_function_start(kallsyms_filename,
1085                                                      kmap->ref_reloc_sym->name);
1086                 if (start != kmap->ref_reloc_sym->addr)
1087                         return -EINVAL;
1088         }
1089
1090         return validate_kcore_modules(kallsyms_filename, map);
1091 }
1092
1093 struct kcore_mapfn_data {
1094         struct dso *dso;
1095         enum map_type type;
1096         struct list_head maps;
1097 };
1098
1099 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1100 {
1101         struct kcore_mapfn_data *md = data;
1102         struct map *map;
1103
1104         map = map__new2(start, md->dso, md->type);
1105         if (map == NULL)
1106                 return -ENOMEM;
1107
1108         map->end = map->start + len;
1109         map->pgoff = pgoff;
1110
1111         list_add(&map->node, &md->maps);
1112
1113         return 0;
1114 }
1115
1116 static int dso__load_kcore(struct dso *dso, struct map *map,
1117                            const char *kallsyms_filename)
1118 {
1119         struct map_groups *kmaps = map__kmaps(map);
1120         struct machine *machine;
1121         struct kcore_mapfn_data md;
1122         struct map *old_map, *new_map, *replacement_map = NULL;
1123         bool is_64_bit;
1124         int err, fd;
1125         char kcore_filename[PATH_MAX];
1126         struct symbol *sym;
1127
1128         if (!kmaps)
1129                 return -EINVAL;
1130
1131         machine = kmaps->machine;
1132
1133         /* This function requires that the map is the kernel map */
1134         if (map != machine->vmlinux_maps[map->type])
1135                 return -EINVAL;
1136
1137         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1138                                              kallsyms_filename))
1139                 return -EINVAL;
1140
1141         /* Modules and kernel must be present at their original addresses */
1142         if (validate_kcore_addresses(kallsyms_filename, map))
1143                 return -EINVAL;
1144
1145         md.dso = dso;
1146         md.type = map->type;
1147         INIT_LIST_HEAD(&md.maps);
1148
1149         fd = open(kcore_filename, O_RDONLY);
1150         if (fd < 0) {
1151                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1152                          kcore_filename);
1153                 return -EINVAL;
1154         }
1155
1156         /* Read new maps into temporary lists */
1157         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1158                               &is_64_bit);
1159         if (err)
1160                 goto out_err;
1161         dso->is_64_bit = is_64_bit;
1162
1163         if (list_empty(&md.maps)) {
1164                 err = -EINVAL;
1165                 goto out_err;
1166         }
1167
1168         /* Remove old maps */
1169         old_map = map_groups__first(kmaps, map->type);
1170         while (old_map) {
1171                 struct map *next = map_groups__next(old_map);
1172
1173                 if (old_map != map)
1174                         map_groups__remove(kmaps, old_map);
1175                 old_map = next;
1176         }
1177
1178         /* Find the kernel map using the first symbol */
1179         sym = dso__first_symbol(dso, map->type);
1180         list_for_each_entry(new_map, &md.maps, node) {
1181                 if (sym && sym->start >= new_map->start &&
1182                     sym->start < new_map->end) {
1183                         replacement_map = new_map;
1184                         break;
1185                 }
1186         }
1187
1188         if (!replacement_map)
1189                 replacement_map = list_entry(md.maps.next, struct map, node);
1190
1191         /* Add new maps */
1192         while (!list_empty(&md.maps)) {
1193                 new_map = list_entry(md.maps.next, struct map, node);
1194                 list_del_init(&new_map->node);
1195                 if (new_map == replacement_map) {
1196                         map->start      = new_map->start;
1197                         map->end        = new_map->end;
1198                         map->pgoff      = new_map->pgoff;
1199                         map->map_ip     = new_map->map_ip;
1200                         map->unmap_ip   = new_map->unmap_ip;
1201                         /* Ensure maps are correctly ordered */
1202                         map__get(map);
1203                         map_groups__remove(kmaps, map);
1204                         map_groups__insert(kmaps, map);
1205                         map__put(map);
1206                 } else {
1207                         map_groups__insert(kmaps, new_map);
1208                 }
1209
1210                 map__put(new_map);
1211         }
1212
1213         /*
1214          * Set the data type and long name so that kcore can be read via
1215          * dso__data_read_addr().
1216          */
1217         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1218                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1219         else
1220                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1221         dso__set_long_name(dso, strdup(kcore_filename), true);
1222
1223         close(fd);
1224
1225         if (map->type == MAP__FUNCTION)
1226                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1227         else
1228                 pr_debug("Using %s for kernel data\n", kcore_filename);
1229
1230         return 0;
1231
1232 out_err:
1233         while (!list_empty(&md.maps)) {
1234                 map = list_entry(md.maps.next, struct map, node);
1235                 list_del_init(&map->node);
1236                 map__put(map);
1237         }
1238         close(fd);
1239         return -EINVAL;
1240 }
1241
1242 /*
1243  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1244  * delta based on the relocation reference symbol.
1245  */
1246 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1247 {
1248         struct kmap *kmap = map__kmap(map);
1249         u64 addr;
1250
1251         if (!kmap)
1252                 return -1;
1253
1254         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1255                 return 0;
1256
1257         addr = kallsyms__get_function_start(filename,
1258                                             kmap->ref_reloc_sym->name);
1259         if (!addr)
1260                 return -1;
1261
1262         *delta = addr - kmap->ref_reloc_sym->addr;
1263         return 0;
1264 }
1265
1266 int dso__load_kallsyms(struct dso *dso, const char *filename,
1267                        struct map *map, symbol_filter_t filter)
1268 {
1269         u64 delta = 0;
1270
1271         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1272                 return -1;
1273
1274         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1275                 return -1;
1276
1277         if (kallsyms__delta(map, filename, &delta))
1278                 return -1;
1279
1280         symbols__fixup_duplicate(&dso->symbols[map->type]);
1281         symbols__fixup_end(&dso->symbols[map->type]);
1282
1283         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1284                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1285         else
1286                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1287
1288         if (!dso__load_kcore(dso, map, filename))
1289                 return dso__split_kallsyms_for_kcore(dso, map, filter);
1290         else
1291                 return dso__split_kallsyms(dso, map, delta, filter);
1292 }
1293
1294 static int dso__load_perf_map(struct dso *dso, struct map *map,
1295                               symbol_filter_t filter)
1296 {
1297         char *line = NULL;
1298         size_t n;
1299         FILE *file;
1300         int nr_syms = 0;
1301
1302         file = fopen(dso->long_name, "r");
1303         if (file == NULL)
1304                 goto out_failure;
1305
1306         while (!feof(file)) {
1307                 u64 start, size;
1308                 struct symbol *sym;
1309                 int line_len, len;
1310
1311                 line_len = getline(&line, &n, file);
1312                 if (line_len < 0)
1313                         break;
1314
1315                 if (!line)
1316                         goto out_failure;
1317
1318                 line[--line_len] = '\0'; /* \n */
1319
1320                 len = hex2u64(line, &start);
1321
1322                 len++;
1323                 if (len + 2 >= line_len)
1324                         continue;
1325
1326                 len += hex2u64(line + len, &size);
1327
1328                 len++;
1329                 if (len + 2 >= line_len)
1330                         continue;
1331
1332                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1333
1334                 if (sym == NULL)
1335                         goto out_delete_line;
1336
1337                 if (filter && filter(map, sym))
1338                         symbol__delete(sym);
1339                 else {
1340                         symbols__insert(&dso->symbols[map->type], sym);
1341                         nr_syms++;
1342                 }
1343         }
1344
1345         free(line);
1346         fclose(file);
1347
1348         return nr_syms;
1349
1350 out_delete_line:
1351         free(line);
1352 out_failure:
1353         return -1;
1354 }
1355
1356 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1357                                            enum dso_binary_type type)
1358 {
1359         switch (type) {
1360         case DSO_BINARY_TYPE__JAVA_JIT:
1361         case DSO_BINARY_TYPE__DEBUGLINK:
1362         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1363         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1364         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1365         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1366         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1367                 return !kmod && dso->kernel == DSO_TYPE_USER;
1368
1369         case DSO_BINARY_TYPE__KALLSYMS:
1370         case DSO_BINARY_TYPE__VMLINUX:
1371         case DSO_BINARY_TYPE__KCORE:
1372                 return dso->kernel == DSO_TYPE_KERNEL;
1373
1374         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1375         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1376         case DSO_BINARY_TYPE__GUEST_KCORE:
1377                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1378
1379         case DSO_BINARY_TYPE__GUEST_KMODULE:
1380         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1381         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1382         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1383                 /*
1384                  * kernel modules know their symtab type - it's set when
1385                  * creating a module dso in machine__findnew_module_map().
1386                  */
1387                 return kmod && dso->symtab_type == type;
1388
1389         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1390                 return true;
1391
1392         case DSO_BINARY_TYPE__NOT_FOUND:
1393         default:
1394                 return false;
1395         }
1396 }
1397
1398 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1399 {
1400         char *name;
1401         int ret = -1;
1402         u_int i;
1403         struct machine *machine;
1404         char *root_dir = (char *) "";
1405         int ss_pos = 0;
1406         struct symsrc ss_[2];
1407         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1408         bool kmod;
1409
1410         pthread_mutex_lock(&dso->lock);
1411
1412         /* check again under the dso->lock */
1413         if (dso__loaded(dso, map->type)) {
1414                 ret = 1;
1415                 goto out;
1416         }
1417
1418         if (dso->kernel) {
1419                 if (dso->kernel == DSO_TYPE_KERNEL)
1420                         ret = dso__load_kernel_sym(dso, map, filter);
1421                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1422                         ret = dso__load_guest_kernel_sym(dso, map, filter);
1423
1424                 goto out;
1425         }
1426
1427         if (map->groups && map->groups->machine)
1428                 machine = map->groups->machine;
1429         else
1430                 machine = NULL;
1431
1432         dso->adjust_symbols = 0;
1433
1434         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1435                 struct stat st;
1436
1437                 if (lstat(dso->name, &st) < 0)
1438                         goto out;
1439
1440                 if (st.st_uid && (st.st_uid != geteuid())) {
1441                         pr_warning("File %s not owned by current user or root, "
1442                                 "ignoring it.\n", dso->name);
1443                         goto out;
1444                 }
1445
1446                 ret = dso__load_perf_map(dso, map, filter);
1447                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1448                                              DSO_BINARY_TYPE__NOT_FOUND;
1449                 goto out;
1450         }
1451
1452         if (machine)
1453                 root_dir = machine->root_dir;
1454
1455         name = malloc(PATH_MAX);
1456         if (!name)
1457                 goto out;
1458
1459         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1460                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1461                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1462                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1463
1464         /*
1465          * Iterate over candidate debug images.
1466          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1467          * and/or opd section) for processing.
1468          */
1469         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1470                 struct symsrc *ss = &ss_[ss_pos];
1471                 bool next_slot = false;
1472
1473                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1474
1475                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1476                         continue;
1477
1478                 if (dso__read_binary_type_filename(dso, symtab_type,
1479                                                    root_dir, name, PATH_MAX))
1480                         continue;
1481
1482                 /* Name is now the name of the next image to try */
1483                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1484                         continue;
1485
1486                 if (!syms_ss && symsrc__has_symtab(ss)) {
1487                         syms_ss = ss;
1488                         next_slot = true;
1489                         if (!dso->symsrc_filename)
1490                                 dso->symsrc_filename = strdup(name);
1491                 }
1492
1493                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1494                         runtime_ss = ss;
1495                         next_slot = true;
1496                 }
1497
1498                 if (next_slot) {
1499                         ss_pos++;
1500
1501                         if (syms_ss && runtime_ss)
1502                                 break;
1503                 } else {
1504                         symsrc__destroy(ss);
1505                 }
1506
1507         }
1508
1509         if (!runtime_ss && !syms_ss)
1510                 goto out_free;
1511
1512         if (runtime_ss && !syms_ss) {
1513                 syms_ss = runtime_ss;
1514         }
1515
1516         /* We'll have to hope for the best */
1517         if (!runtime_ss && syms_ss)
1518                 runtime_ss = syms_ss;
1519
1520         if (syms_ss)
1521                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1522         else
1523                 ret = -1;
1524
1525         if (ret > 0) {
1526                 int nr_plt;
1527
1528                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1529                 if (nr_plt > 0)
1530                         ret += nr_plt;
1531         }
1532
1533         for (; ss_pos > 0; ss_pos--)
1534                 symsrc__destroy(&ss_[ss_pos - 1]);
1535 out_free:
1536         free(name);
1537         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1538                 ret = 0;
1539 out:
1540         dso__set_loaded(dso, map->type);
1541         pthread_mutex_unlock(&dso->lock);
1542
1543         return ret;
1544 }
1545
1546 struct map *map_groups__find_by_name(struct map_groups *mg,
1547                                      enum map_type type, const char *name)
1548 {
1549         struct maps *maps = &mg->maps[type];
1550         struct map *map;
1551
1552         pthread_rwlock_rdlock(&maps->lock);
1553
1554         for (map = maps__first(maps); map; map = map__next(map)) {
1555                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1556                         goto out_unlock;
1557         }
1558
1559         map = NULL;
1560
1561 out_unlock:
1562         pthread_rwlock_unlock(&maps->lock);
1563         return map;
1564 }
1565
1566 int dso__load_vmlinux(struct dso *dso, struct map *map,
1567                       const char *vmlinux, bool vmlinux_allocated,
1568                       symbol_filter_t filter)
1569 {
1570         int err = -1;
1571         struct symsrc ss;
1572         char symfs_vmlinux[PATH_MAX];
1573         enum dso_binary_type symtab_type;
1574
1575         if (vmlinux[0] == '/')
1576                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1577         else
1578                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1579
1580         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1581                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1582         else
1583                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1584
1585         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1586                 return -1;
1587
1588         err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1589         symsrc__destroy(&ss);
1590
1591         if (err > 0) {
1592                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1593                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1594                 else
1595                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1596                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1597                 dso__set_loaded(dso, map->type);
1598                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1599         }
1600
1601         return err;
1602 }
1603
1604 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1605                            symbol_filter_t filter)
1606 {
1607         int i, err = 0;
1608         char *filename = NULL;
1609
1610         if (!symbol_conf.ignore_vmlinux_buildid)
1611                 filename = dso__build_id_filename(dso, NULL, 0);
1612         if (filename != NULL) {
1613                 err = dso__load_vmlinux(dso, map, filename, true, filter);
1614                 if (err > 0)
1615                         goto out;
1616                 free(filename);
1617         }
1618
1619         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1620                  vmlinux_path__nr_entries + 1);
1621
1622         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1623                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1624                 if (err > 0)
1625                         break;
1626         }
1627 out:
1628         return err;
1629 }
1630
1631 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1632 {
1633         char kallsyms_filename[PATH_MAX];
1634         struct dirent *dent;
1635         int ret = -1;
1636         DIR *d;
1637
1638         d = opendir(dir);
1639         if (!d)
1640                 return -1;
1641
1642         while (1) {
1643                 dent = readdir(d);
1644                 if (!dent)
1645                         break;
1646                 if (dent->d_type != DT_DIR)
1647                         continue;
1648                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1649                           "%s/%s/kallsyms", dir, dent->d_name);
1650                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1651                         strlcpy(dir, kallsyms_filename, dir_sz);
1652                         ret = 0;
1653                         break;
1654                 }
1655         }
1656
1657         closedir(d);
1658
1659         return ret;
1660 }
1661
1662 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1663 {
1664         u8 host_build_id[BUILD_ID_SIZE];
1665         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1666         bool is_host = false;
1667         char path[PATH_MAX];
1668
1669         if (!dso->has_build_id) {
1670                 /*
1671                  * Last resort, if we don't have a build-id and couldn't find
1672                  * any vmlinux file, try the running kernel kallsyms table.
1673                  */
1674                 goto proc_kallsyms;
1675         }
1676
1677         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1678                                  sizeof(host_build_id)) == 0)
1679                 is_host = dso__build_id_equal(dso, host_build_id);
1680
1681         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1682
1683         scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1684                   sbuild_id);
1685
1686         /* Use /proc/kallsyms if possible */
1687         if (is_host) {
1688                 DIR *d;
1689                 int fd;
1690
1691                 /* If no cached kcore go with /proc/kallsyms */
1692                 d = opendir(path);
1693                 if (!d)
1694                         goto proc_kallsyms;
1695                 closedir(d);
1696
1697                 /*
1698                  * Do not check the build-id cache, until we know we cannot use
1699                  * /proc/kcore.
1700                  */
1701                 fd = open("/proc/kcore", O_RDONLY);
1702                 if (fd != -1) {
1703                         close(fd);
1704                         /* If module maps match go with /proc/kallsyms */
1705                         if (!validate_kcore_addresses("/proc/kallsyms", map))
1706                                 goto proc_kallsyms;
1707                 }
1708
1709                 /* Find kallsyms in build-id cache with kcore */
1710                 if (!find_matching_kcore(map, path, sizeof(path)))
1711                         return strdup(path);
1712
1713                 goto proc_kallsyms;
1714         }
1715
1716         /* Find kallsyms in build-id cache with kcore */
1717         if (!find_matching_kcore(map, path, sizeof(path)))
1718                 return strdup(path);
1719
1720         scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1721                   buildid_dir, sbuild_id);
1722
1723         if (access(path, F_OK)) {
1724                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1725                        sbuild_id);
1726                 return NULL;
1727         }
1728
1729         return strdup(path);
1730
1731 proc_kallsyms:
1732         return strdup("/proc/kallsyms");
1733 }
1734
1735 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1736                                 symbol_filter_t filter)
1737 {
1738         int err;
1739         const char *kallsyms_filename = NULL;
1740         char *kallsyms_allocated_filename = NULL;
1741         /*
1742          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1743          * it and only it, reporting errors to the user if it cannot be used.
1744          *
1745          * For instance, try to analyse an ARM perf.data file _without_ a
1746          * build-id, or if the user specifies the wrong path to the right
1747          * vmlinux file, obviously we can't fallback to another vmlinux (a
1748          * x86_86 one, on the machine where analysis is being performed, say),
1749          * or worse, /proc/kallsyms.
1750          *
1751          * If the specified file _has_ a build-id and there is a build-id
1752          * section in the perf.data file, we will still do the expected
1753          * validation in dso__load_vmlinux and will bail out if they don't
1754          * match.
1755          */
1756         if (symbol_conf.kallsyms_name != NULL) {
1757                 kallsyms_filename = symbol_conf.kallsyms_name;
1758                 goto do_kallsyms;
1759         }
1760
1761         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1762                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1763                                          false, filter);
1764         }
1765
1766         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1767                 err = dso__load_vmlinux_path(dso, map, filter);
1768                 if (err > 0)
1769                         return err;
1770         }
1771
1772         /* do not try local files if a symfs was given */
1773         if (symbol_conf.symfs[0] != 0)
1774                 return -1;
1775
1776         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1777         if (!kallsyms_allocated_filename)
1778                 return -1;
1779
1780         kallsyms_filename = kallsyms_allocated_filename;
1781
1782 do_kallsyms:
1783         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1784         if (err > 0)
1785                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1786         free(kallsyms_allocated_filename);
1787
1788         if (err > 0 && !dso__is_kcore(dso)) {
1789                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1790                 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1791                 map__fixup_start(map);
1792                 map__fixup_end(map);
1793         }
1794
1795         return err;
1796 }
1797
1798 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1799                                       symbol_filter_t filter)
1800 {
1801         int err;
1802         const char *kallsyms_filename = NULL;
1803         struct machine *machine;
1804         char path[PATH_MAX];
1805
1806         if (!map->groups) {
1807                 pr_debug("Guest kernel map hasn't the point to groups\n");
1808                 return -1;
1809         }
1810         machine = map->groups->machine;
1811
1812         if (machine__is_default_guest(machine)) {
1813                 /*
1814                  * if the user specified a vmlinux filename, use it and only
1815                  * it, reporting errors to the user if it cannot be used.
1816                  * Or use file guest_kallsyms inputted by user on commandline
1817                  */
1818                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1819                         err = dso__load_vmlinux(dso, map,
1820                                                 symbol_conf.default_guest_vmlinux_name,
1821                                                 false, filter);
1822                         return err;
1823                 }
1824
1825                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1826                 if (!kallsyms_filename)
1827                         return -1;
1828         } else {
1829                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1830                 kallsyms_filename = path;
1831         }
1832
1833         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1834         if (err > 0)
1835                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1836         if (err > 0 && !dso__is_kcore(dso)) {
1837                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1838                 machine__mmap_name(machine, path, sizeof(path));
1839                 dso__set_long_name(dso, strdup(path), true);
1840                 map__fixup_start(map);
1841                 map__fixup_end(map);
1842         }
1843
1844         return err;
1845 }
1846
1847 static void vmlinux_path__exit(void)
1848 {
1849         while (--vmlinux_path__nr_entries >= 0)
1850                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1851         vmlinux_path__nr_entries = 0;
1852
1853         zfree(&vmlinux_path);
1854 }
1855
1856 static int vmlinux_path__init(struct perf_env *env)
1857 {
1858         struct utsname uts;
1859         char bf[PATH_MAX];
1860         char *kernel_version;
1861
1862         vmlinux_path = malloc(sizeof(char *) * 6);
1863         if (vmlinux_path == NULL)
1864                 return -1;
1865
1866         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1867         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1868                 goto out_fail;
1869         ++vmlinux_path__nr_entries;
1870         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1871         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1872                 goto out_fail;
1873         ++vmlinux_path__nr_entries;
1874
1875         /* only try kernel version if no symfs was given */
1876         if (symbol_conf.symfs[0] != 0)
1877                 return 0;
1878
1879         if (env) {
1880                 kernel_version = env->os_release;
1881         } else {
1882                 if (uname(&uts) < 0)
1883                         goto out_fail;
1884
1885                 kernel_version = uts.release;
1886         }
1887
1888         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1889         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1890         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1891                 goto out_fail;
1892         ++vmlinux_path__nr_entries;
1893         snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
1894                  kernel_version);
1895         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1896         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1897                 goto out_fail;
1898         ++vmlinux_path__nr_entries;
1899         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1900         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1901         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1902                 goto out_fail;
1903         ++vmlinux_path__nr_entries;
1904         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1905                  kernel_version);
1906         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1907         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1908                 goto out_fail;
1909         ++vmlinux_path__nr_entries;
1910
1911         return 0;
1912
1913 out_fail:
1914         vmlinux_path__exit();
1915         return -1;
1916 }
1917
1918 int setup_list(struct strlist **list, const char *list_str,
1919                       const char *list_name)
1920 {
1921         if (list_str == NULL)
1922                 return 0;
1923
1924         *list = strlist__new(list_str, NULL);
1925         if (!*list) {
1926                 pr_err("problems parsing %s list\n", list_name);
1927                 return -1;
1928         }
1929
1930         symbol_conf.has_filter = true;
1931         return 0;
1932 }
1933
1934 int setup_intlist(struct intlist **list, const char *list_str,
1935                   const char *list_name)
1936 {
1937         if (list_str == NULL)
1938                 return 0;
1939
1940         *list = intlist__new(list_str);
1941         if (!*list) {
1942                 pr_err("problems parsing %s list\n", list_name);
1943                 return -1;
1944         }
1945         return 0;
1946 }
1947
1948 static bool symbol__read_kptr_restrict(void)
1949 {
1950         bool value = false;
1951
1952         if (geteuid() != 0) {
1953                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1954                 if (fp != NULL) {
1955                         char line[8];
1956
1957                         if (fgets(line, sizeof(line), fp) != NULL)
1958                                 value = atoi(line) != 0;
1959
1960                         fclose(fp);
1961                 }
1962         }
1963
1964         return value;
1965 }
1966
1967 int symbol__init(struct perf_env *env)
1968 {
1969         const char *symfs;
1970
1971         if (symbol_conf.initialized)
1972                 return 0;
1973
1974         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1975
1976         symbol__elf_init();
1977
1978         if (symbol_conf.sort_by_name)
1979                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1980                                           sizeof(struct symbol));
1981
1982         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1983                 return -1;
1984
1985         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1986                 pr_err("'.' is the only non valid --field-separator argument\n");
1987                 return -1;
1988         }
1989
1990         if (setup_list(&symbol_conf.dso_list,
1991                        symbol_conf.dso_list_str, "dso") < 0)
1992                 return -1;
1993
1994         if (setup_list(&symbol_conf.comm_list,
1995                        symbol_conf.comm_list_str, "comm") < 0)
1996                 goto out_free_dso_list;
1997
1998         if (setup_intlist(&symbol_conf.pid_list,
1999                        symbol_conf.pid_list_str, "pid") < 0)
2000                 goto out_free_comm_list;
2001
2002         if (setup_intlist(&symbol_conf.tid_list,
2003                        symbol_conf.tid_list_str, "tid") < 0)
2004                 goto out_free_pid_list;
2005
2006         if (setup_list(&symbol_conf.sym_list,
2007                        symbol_conf.sym_list_str, "symbol") < 0)
2008                 goto out_free_tid_list;
2009
2010         /*
2011          * A path to symbols of "/" is identical to ""
2012          * reset here for simplicity.
2013          */
2014         symfs = realpath(symbol_conf.symfs, NULL);
2015         if (symfs == NULL)
2016                 symfs = symbol_conf.symfs;
2017         if (strcmp(symfs, "/") == 0)
2018                 symbol_conf.symfs = "";
2019         if (symfs != symbol_conf.symfs)
2020                 free((void *)symfs);
2021
2022         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2023
2024         symbol_conf.initialized = true;
2025         return 0;
2026
2027 out_free_tid_list:
2028         intlist__delete(symbol_conf.tid_list);
2029 out_free_pid_list:
2030         intlist__delete(symbol_conf.pid_list);
2031 out_free_comm_list:
2032         strlist__delete(symbol_conf.comm_list);
2033 out_free_dso_list:
2034         strlist__delete(symbol_conf.dso_list);
2035         return -1;
2036 }
2037
2038 void symbol__exit(void)
2039 {
2040         if (!symbol_conf.initialized)
2041                 return;
2042         strlist__delete(symbol_conf.sym_list);
2043         strlist__delete(symbol_conf.dso_list);
2044         strlist__delete(symbol_conf.comm_list);
2045         intlist__delete(symbol_conf.tid_list);
2046         intlist__delete(symbol_conf.pid_list);
2047         vmlinux_path__exit();
2048         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2049         symbol_conf.initialized = false;
2050 }