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__MIXEDUP_UBUNTU_DEBUGINFO,
  60         DSO_BINARY_TYPE__NOT_FOUND,
  61 };
  62
  63 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  64
  65 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  66 {
  67         symbol_type = toupper(symbol_type);
  68
  69         switch (map_type) {
  70         case MAP__FUNCTION:
  71                 return symbol_type == 'T' || symbol_type == 'W';
  72         case MAP__VARIABLE:
  73                 return symbol_type == 'D';
  74         default:
  75                 return false;
  76         }
  77 }
  78
  79 static int prefix_underscores_count(const char *str)
  80 {
  81         const char *tail = str;
  82
  83         while (*tail == '_')
  84                 tail++;
  85
  86         return tail - str;
  87 }
  88
  89 int __weak arch__choose_best_symbol(struct symbol *syma,
  90                                     struct symbol *symb __maybe_unused)
  91 {
  92         /* Avoid "SyS" kernel syscall aliases */
  93         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
  94                 return SYMBOL_B;
  95         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
  96                 return SYMBOL_B;
  97
  98         return SYMBOL_A;
  99 }
 100
 101 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 102 {
 103         s64 a;
 104         s64 b;
 105         size_t na, nb;
 106
 107         /* Prefer a symbol with non zero length */
 108         a = syma->end - syma->start;
 109         b = symb->end - symb->start;
 110         if ((b == 0) && (a > 0))
 111                 return SYMBOL_A;
 112         else if ((a == 0) && (b > 0))
 113                 return SYMBOL_B;
 114
 115         /* Prefer a non weak symbol over a weak one */
 116         a = syma->binding == STB_WEAK;
 117         b = symb->binding == STB_WEAK;
 118         if (b && !a)
 119                 return SYMBOL_A;
 120         if (a && !b)
 121                 return SYMBOL_B;
 122
 123         /* Prefer a global symbol over a non global one */
 124         a = syma->binding == STB_GLOBAL;
 125         b = symb->binding == STB_GLOBAL;
 126         if (a && !b)
 127                 return SYMBOL_A;
 128         if (b && !a)
 129                 return SYMBOL_B;
 130
 131         /* Prefer a symbol with less underscores */
 132         a = prefix_underscores_count(syma->name);
 133         b = prefix_underscores_count(symb->name);
 134         if (b > a)
 135                 return SYMBOL_A;
 136         else if (a > b)
 137                 return SYMBOL_B;
 138
 139         /* Choose the symbol with the longest name */
 140         na = strlen(syma->name);
 141         nb = strlen(symb->name);
 142         if (na > nb)
 143                 return SYMBOL_A;
 144         else if (na < nb)
 145                 return SYMBOL_B;
 146
 147         return arch__choose_best_symbol(syma, symb);
 148 }
 149
 150 void symbols__fixup_duplicate(struct rb_root *symbols)
 151 {
 152         struct rb_node *nd;
 153         struct symbol *curr, *next;
 154
 155         if (symbol_conf.allow_aliases)
 156                 return;
 157
 158         nd = rb_first(symbols);
 159
 160         while (nd) {
 161                 curr = rb_entry(nd, struct symbol, rb_node);
 162 again:
 163                 nd = rb_next(&curr->rb_node);
 164                 next = rb_entry(nd, struct symbol, rb_node);
 165
 166                 if (!nd)
 167                         break;
 168
 169                 if (curr->start != next->start)
 170                         continue;
 171
 172                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 173                         rb_erase(&next->rb_node, symbols);
 174                         symbol__delete(next);
 175                         goto again;
 176                 } else {
 177                         nd = rb_next(&curr->rb_node);
 178                         rb_erase(&curr->rb_node, symbols);
 179                         symbol__delete(curr);
 180                 }
 181         }
 182 }
 183
 184 void symbols__fixup_end(struct rb_root *symbols)
 185 {
 186         struct rb_node *nd, *prevnd = rb_first(symbols);
 187         struct symbol *curr, *prev;
 188
 189         if (prevnd == NULL)
 190                 return;
 191
 192         curr = rb_entry(prevnd, struct symbol, rb_node);
 193
 194         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 195                 prev = curr;
 196                 curr = rb_entry(nd, struct symbol, rb_node);
 197
 198                 if (prev->end == prev->start && prev->end != curr->start)
 199                         prev->end = curr->start;
 200         }
 201
 202         /* Last entry */
 203         if (curr->end == curr->start)
 204                 curr->end = roundup(curr->start, 4096) + 4096;
 205 }
 206
 207 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 208 {
 209         struct maps *maps = &mg->maps[type];
 210         struct map *next, *curr;
 211
 212         pthread_rwlock_wrlock(&maps->lock);
 213
 214         curr = maps__first(maps);
 215         if (curr == NULL)
 216                 goto out_unlock;
 217
 218         for (next = map__next(curr); next; next = map__next(curr)) {
 219                 curr->end = next->start;
 220                 curr = next;
 221         }
 222
 223         /*
 224          * We still haven't the actual symbols, so guess the
 225          * last map final address.
 226          */
 227         curr->end = ~0ULL;
 228
 229 out_unlock:
 230         pthread_rwlock_unlock(&maps->lock);
 231 }
 232
 233 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 234 {
 235         size_t namelen = strlen(name) + 1;
 236         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 237                                         sizeof(*sym) + namelen));
 238         if (sym == NULL)
 239                 return NULL;
 240
 241         if (symbol_conf.priv_size)
 242                 sym = ((void *)sym) + symbol_conf.priv_size;
 243
 244         sym->start   = start;
 245         sym->end     = len ? start + len : start;
 246         sym->binding = binding;
 247         sym->namelen = namelen - 1;
 248
 249         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 250                   __func__, name, start, sym->end);
 251         memcpy(sym->name, name, namelen);
 252
 253         return sym;
 254 }
 255
 256 void symbol__delete(struct symbol *sym)
 257 {
 258         free(((void *)sym) - symbol_conf.priv_size);
 259 }
 260
 261 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
 262 {
 263         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
 264                        sym->start, sym->end,
 265                        sym->binding == STB_GLOBAL ? 'g' :
 266                        sym->binding == STB_LOCAL  ? 'l' : 'w',
 267                        sym->name);
 268 }
 269
 270 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 271                                     const struct addr_location *al, FILE *fp)
 272 {
 273         unsigned long offset;
 274         size_t length;
 275
 276         if (sym && sym->name) {
 277                 length = fprintf(fp, "%s", sym->name);
 278                 if (al) {
 279                         if (al->addr < sym->end)
 280                                 offset = al->addr - sym->start;
 281                         else
 282                                 offset = al->addr - al->map->start - sym->start;
 283                         length += fprintf(fp, "+0x%lx", offset);
 284                 }
 285                 return length;
 286         } else
 287                 return fprintf(fp, "[unknown]");
 288 }
 289
 290 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
 291 {
 292         return symbol__fprintf_symname_offs(sym, NULL, fp);
 293 }
 294
 295 void symbols__delete(struct rb_root *symbols)
 296 {
 297         struct symbol *pos;
 298         struct rb_node *next = rb_first(symbols);
 299
 300         while (next) {
 301                 pos = rb_entry(next, struct symbol, rb_node);
 302                 next = rb_next(&pos->rb_node);
 303                 rb_erase(&pos->rb_node, symbols);
 304                 symbol__delete(pos);
 305         }
 306 }
 307
 308 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 309 {
 310         struct rb_node **p = &symbols->rb_node;
 311         struct rb_node *parent = NULL;
 312         const u64 ip = sym->start;
 313         struct symbol *s;
 314
 315         while (*p != NULL) {
 316                 parent = *p;
 317                 s = rb_entry(parent, struct symbol, rb_node);
 318                 if (ip < s->start)
 319                         p = &(*p)->rb_left;
 320                 else
 321                         p = &(*p)->rb_right;
 322         }
 323         rb_link_node(&sym->rb_node, parent, p);
 324         rb_insert_color(&sym->rb_node, symbols);
 325 }
 326
 327 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
 328 {
 329         struct rb_node *n;
 330
 331         if (symbols == NULL)
 332                 return NULL;
 333
 334         n = symbols->rb_node;
 335
 336         while (n) {
 337                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 338
 339                 if (ip < s->start)
 340                         n = n->rb_left;
 341                 else if (ip >= s->end)
 342                         n = n->rb_right;
 343                 else
 344                         return s;
 345         }
 346
 347         return NULL;
 348 }
 349
 350 static struct symbol *symbols__first(struct rb_root *symbols)
 351 {
 352         struct rb_node *n = rb_first(symbols);
 353
 354         if (n)
 355                 return rb_entry(n, struct symbol, rb_node);
 356
 357         return NULL;
 358 }
 359
 360 static struct symbol *symbols__next(struct symbol *sym)
 361 {
 362         struct rb_node *n = rb_next(&sym->rb_node);
 363
 364         if (n)
 365                 return rb_entry(n, struct symbol, rb_node);
 366
 367         return NULL;
 368 }
 369
 370 struct symbol_name_rb_node {
 371         struct rb_node  rb_node;
 372         struct symbol   sym;
 373 };
 374
 375 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
 376 {
 377         struct rb_node **p = &symbols->rb_node;
 378         struct rb_node *parent = NULL;
 379         struct symbol_name_rb_node *symn, *s;
 380
 381         symn = container_of(sym, struct symbol_name_rb_node, sym);
 382
 383         while (*p != NULL) {
 384                 parent = *p;
 385                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 386                 if (strcmp(sym->name, s->sym.name) < 0)
 387                         p = &(*p)->rb_left;
 388                 else
 389                         p = &(*p)->rb_right;
 390         }
 391         rb_link_node(&symn->rb_node, parent, p);
 392         rb_insert_color(&symn->rb_node, symbols);
 393 }
 394
 395 static void symbols__sort_by_name(struct rb_root *symbols,
 396                                   struct rb_root *source)
 397 {
 398         struct rb_node *nd;
 399
 400         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 401                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 402                 symbols__insert_by_name(symbols, pos);
 403         }
 404 }
 405
 406 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
 407                                             const char *name)
 408 {
 409         struct rb_node *n;
 410         struct symbol_name_rb_node *s = NULL;
 411
 412         if (symbols == NULL)
 413                 return NULL;
 414
 415         n = symbols->rb_node;
 416
 417         while (n) {
 418                 int cmp;
 419
 420                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 421                 cmp = arch__compare_symbol_names(name, s->sym.name);
 422
 423                 if (cmp < 0)
 424                         n = n->rb_left;
 425                 else if (cmp > 0)
 426                         n = n->rb_right;
 427                 else
 428                         break;
 429         }
 430
 431         if (n == NULL)
 432                 return NULL;
 433
 434         /* return first symbol that has same name (if any) */
 435         for (n = rb_prev(n); n; n = rb_prev(n)) {
 436                 struct symbol_name_rb_node *tmp;
 437
 438                 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 439                 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
 440                         break;
 441
 442                 s = tmp;
 443         }
 444
 445         return &s->sym;
 446 }
 447
 448 void dso__reset_find_symbol_cache(struct dso *dso)
 449 {
 450         enum map_type type;
 451
 452         for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) {
 453                 dso->last_find_result[type].addr   = 0;
 454                 dso->last_find_result[type].symbol = NULL;
 455         }
 456 }
 457
 458 struct symbol *dso__find_symbol(struct dso *dso,
 459                                 enum map_type type, u64 addr)
 460 {
 461         if (dso->last_find_result[type].addr != addr) {
 462                 dso->last_find_result[type].addr   = addr;
 463                 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr);
 464         }
 465
 466         return dso->last_find_result[type].symbol;
 467 }
 468
 469 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 470 {
 471         return symbols__first(&dso->symbols[type]);
 472 }
 473
 474 struct symbol *dso__next_symbol(struct symbol *sym)
 475 {
 476         return symbols__next(sym);
 477 }
 478
 479 struct symbol *symbol__next_by_name(struct symbol *sym)
 480 {
 481         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 482         struct rb_node *n = rb_next(&s->rb_node);
 483
 484         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 485 }
 486
 487  /*
 488   * Teturns first symbol that matched with @name.
 489   */
 490 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 491                                         const char *name)
 492 {
 493         return symbols__find_by_name(&dso->symbol_names[type], name);
 494 }
 495
 496 void dso__sort_by_name(struct dso *dso, enum map_type type)
 497 {
 498         dso__set_sorted_by_name(dso, type);
 499         return symbols__sort_by_name(&dso->symbol_names[type],
 500                                      &dso->symbols[type]);
 501 }
 502
 503 size_t dso__fprintf_symbols_by_name(struct dso *dso,
 504                                     enum map_type type, FILE *fp)
 505 {
 506         size_t ret = 0;
 507         struct rb_node *nd;
 508         struct symbol_name_rb_node *pos;
 509
 510         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
 511                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 512                 fprintf(fp, "%s\n", pos->sym.name);
 513         }
 514
 515         return ret;
 516 }
 517
 518 int modules__parse(const char *filename, void *arg,
 519                    int (*process_module)(void *arg, const char *name,
 520                                          u64 start))
 521 {
 522         char *line = NULL;
 523         size_t n;
 524         FILE *file;
 525         int err = 0;
 526
 527         file = fopen(filename, "r");
 528         if (file == NULL)
 529                 return -1;
 530
 531         while (1) {
 532                 char name[PATH_MAX];
 533                 u64 start;
 534                 char *sep;
 535                 ssize_t line_len;
 536
 537                 line_len = getline(&line, &n, file);
 538                 if (line_len < 0) {
 539                         if (feof(file))
 540                                 break;
 541                         err = -1;
 542                         goto out;
 543                 }
 544
 545                 if (!line) {
 546                         err = -1;
 547                         goto out;
 548                 }
 549
 550                 line[--line_len] = '\0'; /* \n */
 551
 552                 sep = strrchr(line, 'x');
 553                 if (sep == NULL)
 554                         continue;
 555
 556                 hex2u64(sep + 1, &start);
 557
 558                 sep = strchr(line, ' ');
 559                 if (sep == NULL)
 560                         continue;
 561
 562                 *sep = '\0';
 563
 564                 scnprintf(name, sizeof(name), "[%s]", line);
 565
 566                 err = process_module(arg, name, start);
 567                 if (err)
 568                         break;
 569         }
 570 out:
 571         free(line);
 572         fclose(file);
 573         return err;
 574 }
 575
 576 struct process_kallsyms_args {
 577         struct map *map;
 578         struct dso *dso;
 579 };
 580
 581 /*
 582  * These are symbols in the kernel image, so make sure that
 583  * sym is from a kernel DSO.
 584  */
 585 bool symbol__is_idle(struct symbol *sym)
 586 {
 587         const char * const idle_symbols[] = {
 588                 "cpu_idle",
 589                 "cpu_startup_entry",
 590                 "intel_idle",
 591                 "default_idle",
 592                 "native_safe_halt",
 593                 "enter_idle",
 594                 "exit_idle",
 595                 "mwait_idle",
 596                 "mwait_idle_with_hints",
 597                 "poll_idle",
 598                 "ppc64_runlatch_off",
 599                 "pseries_dedicated_idle_sleep",
 600                 NULL
 601         };
 602
 603         int i;
 604
 605         if (!sym)
 606                 return false;
 607
 608         for (i = 0; idle_symbols[i]; i++) {
 609                 if (!strcmp(idle_symbols[i], sym->name))
 610                         return true;
 611         }
 612
 613         return false;
 614 }
 615
 616 static int map__process_kallsym_symbol(void *arg, const char *name,
 617                                        char type, u64 start)
 618 {
 619         struct symbol *sym;
 620         struct process_kallsyms_args *a = arg;
 621         struct rb_root *root = &a->dso->symbols[a->map->type];
 622
 623         if (!symbol_type__is_a(type, a->map->type))
 624                 return 0;
 625
 626         /*
 627          * module symbols are not sorted so we add all
 628          * symbols, setting length to 0, and rely on
 629          * symbols__fixup_end() to fix it up.
 630          */
 631         sym = symbol__new(start, 0, kallsyms2elf_binding(type), name);
 632         if (sym == NULL)
 633                 return -ENOMEM;
 634         /*
 635          * We will pass the symbols to the filter later, in
 636          * map__split_kallsyms, when we have split the maps per module
 637          */
 638         symbols__insert(root, sym);
 639
 640         return 0;
 641 }
 642
 643 /*
 644  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 645  * so that we can in the next step set the symbol ->end address and then
 646  * call kernel_maps__split_kallsyms.
 647  */
 648 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 649                                   struct map *map)
 650 {
 651         struct process_kallsyms_args args = { .map = map, .dso = dso, };
 652         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 653 }
 654
 655 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
 656                                          symbol_filter_t filter)
 657 {
 658         struct map_groups *kmaps = map__kmaps(map);
 659         struct map *curr_map;
 660         struct symbol *pos;
 661         int count = 0;
 662         struct rb_root old_root = dso->symbols[map->type];
 663         struct rb_root *root = &dso->symbols[map->type];
 664         struct rb_node *next = rb_first(root);
 665
 666         if (!kmaps)
 667                 return -1;
 668
 669         *root = RB_ROOT;
 670
 671         while (next) {
 672                 char *module;
 673
 674                 pos = rb_entry(next, struct symbol, rb_node);
 675                 next = rb_next(&pos->rb_node);
 676
 677                 rb_erase_init(&pos->rb_node, &old_root);
 678
 679                 module = strchr(pos->name, '\t');
 680                 if (module)
 681                         *module = '\0';
 682
 683                 curr_map = map_groups__find(kmaps, map->type, pos->start);
 684
 685                 if (!curr_map || (filter && filter(curr_map, pos))) {
 686                         symbol__delete(pos);
 687                         continue;
 688                 }
 689
 690                 pos->start -= curr_map->start - curr_map->pgoff;
 691                 if (pos->end)
 692                         pos->end -= curr_map->start - curr_map->pgoff;
 693                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 694                 ++count;
 695         }
 696
 697         /* Symbols have been adjusted */
 698         dso->adjust_symbols = 1;
 699
 700         return count;
 701 }
 702
 703 /*
 704  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 705  * kernel range is broken in several maps, named [kernel].N, as we don't have
 706  * the original ELF section names vmlinux have.
 707  */
 708 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
 709                                symbol_filter_t filter)
 710 {
 711         struct map_groups *kmaps = map__kmaps(map);
 712         struct machine *machine;
 713         struct map *curr_map = map;
 714         struct symbol *pos;
 715         int count = 0, moved = 0;
 716         struct rb_root *root = &dso->symbols[map->type];
 717         struct rb_node *next = rb_first(root);
 718         int kernel_range = 0;
 719
 720         if (!kmaps)
 721                 return -1;
 722
 723         machine = kmaps->machine;
 724
 725         while (next) {
 726                 char *module;
 727
 728                 pos = rb_entry(next, struct symbol, rb_node);
 729                 next = rb_next(&pos->rb_node);
 730
 731                 module = strchr(pos->name, '\t');
 732                 if (module) {
 733                         if (!symbol_conf.use_modules)
 734                                 goto discard_symbol;
 735
 736                         *module++ = '\0';
 737
 738                         if (strcmp(curr_map->dso->short_name, module)) {
 739                                 if (curr_map != map &&
 740                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 741                                     machine__is_default_guest(machine)) {
 742                                         /*
 743                                          * We assume all symbols of a module are
 744                                          * continuous in * kallsyms, so curr_map
 745                                          * points to a module and all its
 746                                          * symbols are in its kmap. Mark it as
 747                                          * loaded.
 748                                          */
 749                                         dso__set_loaded(curr_map->dso,
 750                                                         curr_map->type);
 751                                 }
 752
 753                                 curr_map = map_groups__find_by_name(kmaps,
 754                                                         map->type, module);
 755                                 if (curr_map == NULL) {
 756                                         pr_debug("%s/proc/{kallsyms,modules} "
 757                                                  "inconsistency while looking "
 758                                                  "for \"%s\" module!\n",
 759                                                  machine->root_dir, module);
 760                                         curr_map = map;
 761                                         goto discard_symbol;
 762                                 }
 763
 764                                 if (curr_map->dso->loaded &&
 765                                     !machine__is_default_guest(machine))
 766                                         goto discard_symbol;
 767                         }
 768                         /*
 769                          * So that we look just like we get from .ko files,
 770                          * i.e. not prelinked, relative to map->start.
 771                          */
 772                         pos->start = curr_map->map_ip(curr_map, pos->start);
 773                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 774                 } else if (curr_map != map) {
 775                         char dso_name[PATH_MAX];
 776                         struct dso *ndso;
 777
 778                         if (delta) {
 779                                 /* Kernel was relocated at boot time */
 780                                 pos->start -= delta;
 781                                 pos->end -= delta;
 782                         }
 783
 784                         if (count == 0) {
 785                                 curr_map = map;
 786                                 goto filter_symbol;
 787                         }
 788
 789                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 790                                 snprintf(dso_name, sizeof(dso_name),
 791                                         "[guest.kernel].%d",
 792                                         kernel_range++);
 793                         else
 794                                 snprintf(dso_name, sizeof(dso_name),
 795                                         "[kernel].%d",
 796                                         kernel_range++);
 797
 798                         ndso = dso__new(dso_name);
 799                         if (ndso == NULL)
 800                                 return -1;
 801
 802                         ndso->kernel = dso->kernel;
 803
 804                         curr_map = map__new2(pos->start, ndso, map->type);
 805                         if (curr_map == NULL) {
 806                                 dso__put(ndso);
 807                                 return -1;
 808                         }
 809
 810                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 811                         map_groups__insert(kmaps, curr_map);
 812                         ++kernel_range;
 813                 } else if (delta) {
 814                         /* Kernel was relocated at boot time */
 815                         pos->start -= delta;
 816                         pos->end -= delta;
 817                 }
 818 filter_symbol:
 819                 if (filter && filter(curr_map, pos)) {
 820 discard_symbol:         rb_erase(&pos->rb_node, root);
 821                         symbol__delete(pos);
 822                 } else {
 823                         if (curr_map != map) {
 824                                 rb_erase(&pos->rb_node, root);
 825                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 826                                 ++moved;
 827                         } else
 828                                 ++count;
 829                 }
 830         }
 831
 832         if (curr_map != map &&
 833             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 834             machine__is_default_guest(kmaps->machine)) {
 835                 dso__set_loaded(curr_map->dso, curr_map->type);
 836         }
 837
 838         return count + moved;
 839 }
 840
 841 bool symbol__restricted_filename(const char *filename,
 842                                  const char *restricted_filename)
 843 {
 844         bool restricted = false;
 845
 846         if (symbol_conf.kptr_restrict) {
 847                 char *r = realpath(filename, NULL);
 848
 849                 if (r != NULL) {
 850                         restricted = strcmp(r, restricted_filename) == 0;
 851                         free(r);
 852                         return restricted;
 853                 }
 854         }
 855
 856         return restricted;
 857 }
 858
 859 struct module_info {
 860         struct rb_node rb_node;
 861         char *name;
 862         u64 start;
 863 };
 864
 865 static void add_module(struct module_info *mi, struct rb_root *modules)
 866 {
 867         struct rb_node **p = &modules->rb_node;
 868         struct rb_node *parent = NULL;
 869         struct module_info *m;
 870
 871         while (*p != NULL) {
 872                 parent = *p;
 873                 m = rb_entry(parent, struct module_info, rb_node);
 874                 if (strcmp(mi->name, m->name) < 0)
 875                         p = &(*p)->rb_left;
 876                 else
 877                         p = &(*p)->rb_right;
 878         }
 879         rb_link_node(&mi->rb_node, parent, p);
 880         rb_insert_color(&mi->rb_node, modules);
 881 }
 882
 883 static void delete_modules(struct rb_root *modules)
 884 {
 885         struct module_info *mi;
 886         struct rb_node *next = rb_first(modules);
 887
 888         while (next) {
 889                 mi = rb_entry(next, struct module_info, rb_node);
 890                 next = rb_next(&mi->rb_node);
 891                 rb_erase(&mi->rb_node, modules);
 892                 zfree(&mi->name);
 893                 free(mi);
 894         }
 895 }
 896
 897 static struct module_info *find_module(const char *name,
 898                                        struct rb_root *modules)
 899 {
 900         struct rb_node *n = modules->rb_node;
 901
 902         while (n) {
 903                 struct module_info *m;
 904                 int cmp;
 905
 906                 m = rb_entry(n, struct module_info, rb_node);
 907                 cmp = strcmp(name, m->name);
 908                 if (cmp < 0)
 909                         n = n->rb_left;
 910                 else if (cmp > 0)
 911                         n = n->rb_right;
 912                 else
 913                         return m;
 914         }
 915
 916         return NULL;
 917 }
 918
 919 static int __read_proc_modules(void *arg, const char *name, u64 start)
 920 {
 921         struct rb_root *modules = arg;
 922         struct module_info *mi;
 923
 924         mi = zalloc(sizeof(struct module_info));
 925         if (!mi)
 926                 return -ENOMEM;
 927
 928         mi->name = strdup(name);
 929         mi->start = start;
 930
 931         if (!mi->name) {
 932                 free(mi);
 933                 return -ENOMEM;
 934         }
 935
 936         add_module(mi, modules);
 937
 938         return 0;
 939 }
 940
 941 static int read_proc_modules(const char *filename, struct rb_root *modules)
 942 {
 943         if (symbol__restricted_filename(filename, "/proc/modules"))
 944                 return -1;
 945
 946         if (modules__parse(filename, modules, __read_proc_modules)) {
 947                 delete_modules(modules);
 948                 return -1;
 949         }
 950
 951         return 0;
 952 }
 953
 954 int compare_proc_modules(const char *from, const char *to)
 955 {
 956         struct rb_root from_modules = RB_ROOT;
 957         struct rb_root to_modules = RB_ROOT;
 958         struct rb_node *from_node, *to_node;
 959         struct module_info *from_m, *to_m;
 960         int ret = -1;
 961
 962         if (read_proc_modules(from, &from_modules))
 963                 return -1;
 964
 965         if (read_proc_modules(to, &to_modules))
 966                 goto out_delete_from;
 967
 968         from_node = rb_first(&from_modules);
 969         to_node = rb_first(&to_modules);
 970         while (from_node) {
 971                 if (!to_node)
 972                         break;
 973
 974                 from_m = rb_entry(from_node, struct module_info, rb_node);
 975                 to_m = rb_entry(to_node, struct module_info, rb_node);
 976
 977                 if (from_m->start != to_m->start ||
 978                     strcmp(from_m->name, to_m->name))
 979                         break;
 980
 981                 from_node = rb_next(from_node);
 982                 to_node = rb_next(to_node);
 983         }
 984
 985         if (!from_node && !to_node)
 986                 ret = 0;
 987
 988         delete_modules(&to_modules);
 989 out_delete_from:
 990         delete_modules(&from_modules);
 991
 992         return ret;
 993 }
 994
 995 static int do_validate_kcore_modules(const char *filename, struct map *map,
 996                                   struct map_groups *kmaps)
 997 {
 998         struct rb_root modules = RB_ROOT;
 999         struct map *old_map;
1000         int err;
1001
1002         err = read_proc_modules(filename, &modules);
1003         if (err)
1004                 return err;
1005
1006         old_map = map_groups__first(kmaps, map->type);
1007         while (old_map) {
1008                 struct map *next = map_groups__next(old_map);
1009                 struct module_info *mi;
1010
1011                 if (old_map == map || old_map->start == map->start) {
1012                         /* The kernel map */
1013                         old_map = next;
1014                         continue;
1015                 }
1016
1017                 /* Module must be in memory at the same address */
1018                 mi = find_module(old_map->dso->short_name, &modules);
1019                 if (!mi || mi->start != old_map->start) {
1020                         err = -EINVAL;
1021                         goto out;
1022                 }
1023
1024                 old_map = next;
1025         }
1026 out:
1027         delete_modules(&modules);
1028         return err;
1029 }
1030
1031 /*
1032  * If kallsyms is referenced by name then we look for filename in the same
1033  * directory.
1034  */
1035 static bool filename_from_kallsyms_filename(char *filename,
1036                                             const char *base_name,
1037                                             const char *kallsyms_filename)
1038 {
1039         char *name;
1040
1041         strcpy(filename, kallsyms_filename);
1042         name = strrchr(filename, '/');
1043         if (!name)
1044                 return false;
1045
1046         name += 1;
1047
1048         if (!strcmp(name, "kallsyms")) {
1049                 strcpy(name, base_name);
1050                 return true;
1051         }
1052
1053         return false;
1054 }
1055
1056 static int validate_kcore_modules(const char *kallsyms_filename,
1057                                   struct map *map)
1058 {
1059         struct map_groups *kmaps = map__kmaps(map);
1060         char modules_filename[PATH_MAX];
1061
1062         if (!kmaps)
1063                 return -EINVAL;
1064
1065         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1066                                              kallsyms_filename))
1067                 return -EINVAL;
1068
1069         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1070                 return -EINVAL;
1071
1072         return 0;
1073 }
1074
1075 static int validate_kcore_addresses(const char *kallsyms_filename,
1076                                     struct map *map)
1077 {
1078         struct kmap *kmap = map__kmap(map);
1079
1080         if (!kmap)
1081                 return -EINVAL;
1082
1083         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1084                 u64 start;
1085
1086                 start = kallsyms__get_function_start(kallsyms_filename,
1087                                                      kmap->ref_reloc_sym->name);
1088                 if (start != kmap->ref_reloc_sym->addr)
1089                         return -EINVAL;
1090         }
1091
1092         return validate_kcore_modules(kallsyms_filename, map);
1093 }
1094
1095 struct kcore_mapfn_data {
1096         struct dso *dso;
1097         enum map_type type;
1098         struct list_head maps;
1099 };
1100
1101 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1102 {
1103         struct kcore_mapfn_data *md = data;
1104         struct map *map;
1105
1106         map = map__new2(start, md->dso, md->type);
1107         if (map == NULL)
1108                 return -ENOMEM;
1109
1110         map->end = map->start + len;
1111         map->pgoff = pgoff;
1112
1113         list_add(&map->node, &md->maps);
1114
1115         return 0;
1116 }
1117
1118 static int dso__load_kcore(struct dso *dso, struct map *map,
1119                            const char *kallsyms_filename)
1120 {
1121         struct map_groups *kmaps = map__kmaps(map);
1122         struct machine *machine;
1123         struct kcore_mapfn_data md;
1124         struct map *old_map, *new_map, *replacement_map = NULL;
1125         bool is_64_bit;
1126         int err, fd;
1127         char kcore_filename[PATH_MAX];
1128         struct symbol *sym;
1129
1130         if (!kmaps)
1131                 return -EINVAL;
1132
1133         machine = kmaps->machine;
1134
1135         /* This function requires that the map is the kernel map */
1136         if (map != machine->vmlinux_maps[map->type])
1137                 return -EINVAL;
1138
1139         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1140                                              kallsyms_filename))
1141                 return -EINVAL;
1142
1143         /* Modules and kernel must be present at their original addresses */
1144         if (validate_kcore_addresses(kallsyms_filename, map))
1145                 return -EINVAL;
1146
1147         md.dso = dso;
1148         md.type = map->type;
1149         INIT_LIST_HEAD(&md.maps);
1150
1151         fd = open(kcore_filename, O_RDONLY);
1152         if (fd < 0) {
1153                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1154                          kcore_filename);
1155                 return -EINVAL;
1156         }
1157
1158         /* Read new maps into temporary lists */
1159         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1160                               &is_64_bit);
1161         if (err)
1162                 goto out_err;
1163         dso->is_64_bit = is_64_bit;
1164
1165         if (list_empty(&md.maps)) {
1166                 err = -EINVAL;
1167                 goto out_err;
1168         }
1169
1170         /* Remove old maps */
1171         old_map = map_groups__first(kmaps, map->type);
1172         while (old_map) {
1173                 struct map *next = map_groups__next(old_map);
1174
1175                 if (old_map != map)
1176                         map_groups__remove(kmaps, old_map);
1177                 old_map = next;
1178         }
1179
1180         /* Find the kernel map using the first symbol */
1181         sym = dso__first_symbol(dso, map->type);
1182         list_for_each_entry(new_map, &md.maps, node) {
1183                 if (sym && sym->start >= new_map->start &&
1184                     sym->start < new_map->end) {
1185                         replacement_map = new_map;
1186                         break;
1187                 }
1188         }
1189
1190         if (!replacement_map)
1191                 replacement_map = list_entry(md.maps.next, struct map, node);
1192
1193         /* Add new maps */
1194         while (!list_empty(&md.maps)) {
1195                 new_map = list_entry(md.maps.next, struct map, node);
1196                 list_del_init(&new_map->node);
1197                 if (new_map == replacement_map) {
1198                         map->start      = new_map->start;
1199                         map->end        = new_map->end;
1200                         map->pgoff      = new_map->pgoff;
1201                         map->map_ip     = new_map->map_ip;
1202                         map->unmap_ip   = new_map->unmap_ip;
1203                         /* Ensure maps are correctly ordered */
1204                         map__get(map);
1205                         map_groups__remove(kmaps, map);
1206                         map_groups__insert(kmaps, map);
1207                         map__put(map);
1208                 } else {
1209                         map_groups__insert(kmaps, new_map);
1210                 }
1211
1212                 map__put(new_map);
1213         }
1214
1215         /*
1216          * Set the data type and long name so that kcore can be read via
1217          * dso__data_read_addr().
1218          */
1219         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1220                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1221         else
1222                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1223         dso__set_long_name(dso, strdup(kcore_filename), true);
1224
1225         close(fd);
1226
1227         if (map->type == MAP__FUNCTION)
1228                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1229         else
1230                 pr_debug("Using %s for kernel data\n", kcore_filename);
1231
1232         return 0;
1233
1234 out_err:
1235         while (!list_empty(&md.maps)) {
1236                 map = list_entry(md.maps.next, struct map, node);
1237                 list_del_init(&map->node);
1238                 map__put(map);
1239         }
1240         close(fd);
1241         return -EINVAL;
1242 }
1243
1244 /*
1245  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1246  * delta based on the relocation reference symbol.
1247  */
1248 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1249 {
1250         struct kmap *kmap = map__kmap(map);
1251         u64 addr;
1252
1253         if (!kmap)
1254                 return -1;
1255
1256         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1257                 return 0;
1258
1259         addr = kallsyms__get_function_start(filename,
1260                                             kmap->ref_reloc_sym->name);
1261         if (!addr)
1262                 return -1;
1263
1264         *delta = addr - kmap->ref_reloc_sym->addr;
1265         return 0;
1266 }
1267
1268 int dso__load_kallsyms(struct dso *dso, const char *filename,
1269                        struct map *map, symbol_filter_t filter)
1270 {
1271         u64 delta = 0;
1272
1273         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1274                 return -1;
1275
1276         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1277                 return -1;
1278
1279         if (kallsyms__delta(map, filename, &delta))
1280                 return -1;
1281
1282         symbols__fixup_end(&dso->symbols[map->type]);
1283         symbols__fixup_duplicate(&dso->symbols[map->type]);
1284
1285         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1286                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1287         else
1288                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1289
1290         if (!dso__load_kcore(dso, map, filename))
1291                 return dso__split_kallsyms_for_kcore(dso, map, filter);
1292         else
1293                 return dso__split_kallsyms(dso, map, delta, filter);
1294 }
1295
1296 static int dso__load_perf_map(struct dso *dso, struct map *map,
1297                               symbol_filter_t filter)
1298 {
1299         char *line = NULL;
1300         size_t n;
1301         FILE *file;
1302         int nr_syms = 0;
1303
1304         file = fopen(dso->long_name, "r");
1305         if (file == NULL)
1306                 goto out_failure;
1307
1308         while (!feof(file)) {
1309                 u64 start, size;
1310                 struct symbol *sym;
1311                 int line_len, len;
1312
1313                 line_len = getline(&line, &n, file);
1314                 if (line_len < 0)
1315                         break;
1316
1317                 if (!line)
1318                         goto out_failure;
1319
1320                 line[--line_len] = '\0'; /* \n */
1321
1322                 len = hex2u64(line, &start);
1323
1324                 len++;
1325                 if (len + 2 >= line_len)
1326                         continue;
1327
1328                 len += hex2u64(line + len, &size);
1329
1330                 len++;
1331                 if (len + 2 >= line_len)
1332                         continue;
1333
1334                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1335
1336                 if (sym == NULL)
1337                         goto out_delete_line;
1338
1339                 if (filter && filter(map, sym))
1340                         symbol__delete(sym);
1341                 else {
1342                         symbols__insert(&dso->symbols[map->type], sym);
1343                         nr_syms++;
1344                 }
1345         }
1346
1347         free(line);
1348         fclose(file);
1349
1350         return nr_syms;
1351
1352 out_delete_line:
1353         free(line);
1354 out_failure:
1355         return -1;
1356 }
1357
1358 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1359                                            enum dso_binary_type type)
1360 {
1361         switch (type) {
1362         case DSO_BINARY_TYPE__JAVA_JIT:
1363         case DSO_BINARY_TYPE__DEBUGLINK:
1364         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1365         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1366         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1367         case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1368         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1369         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1370                 return !kmod && dso->kernel == DSO_TYPE_USER;
1371
1372         case DSO_BINARY_TYPE__KALLSYMS:
1373         case DSO_BINARY_TYPE__VMLINUX:
1374         case DSO_BINARY_TYPE__KCORE:
1375                 return dso->kernel == DSO_TYPE_KERNEL;
1376
1377         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1378         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1379         case DSO_BINARY_TYPE__GUEST_KCORE:
1380                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1381
1382         case DSO_BINARY_TYPE__GUEST_KMODULE:
1383         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1384         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1385         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1386                 /*
1387                  * kernel modules know their symtab type - it's set when
1388                  * creating a module dso in machine__findnew_module_map().
1389                  */
1390                 return kmod && dso->symtab_type == type;
1391
1392         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1393                 return true;
1394
1395         case DSO_BINARY_TYPE__NOT_FOUND:
1396         default:
1397                 return false;
1398         }
1399 }
1400
1401 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1402 {
1403         char *name;
1404         int ret = -1;
1405         u_int i;
1406         struct machine *machine;
1407         char *root_dir = (char *) "";
1408         int ss_pos = 0;
1409         struct symsrc ss_[2];
1410         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1411         bool kmod;
1412         unsigned char build_id[BUILD_ID_SIZE];
1413
1414         pthread_mutex_lock(&dso->lock);
1415
1416         /* check again under the dso->lock */
1417         if (dso__loaded(dso, map->type)) {
1418                 ret = 1;
1419                 goto out;
1420         }
1421
1422         if (dso->kernel) {
1423                 if (dso->kernel == DSO_TYPE_KERNEL)
1424                         ret = dso__load_kernel_sym(dso, map, filter);
1425                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1426                         ret = dso__load_guest_kernel_sym(dso, map, filter);
1427
1428                 goto out;
1429         }
1430
1431         if (map->groups && map->groups->machine)
1432                 machine = map->groups->machine;
1433         else
1434                 machine = NULL;
1435
1436         dso->adjust_symbols = 0;
1437
1438         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1439                 struct stat st;
1440
1441                 if (lstat(dso->name, &st) < 0)
1442                         goto out;
1443
1444                 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
1445                         pr_warning("File %s not owned by current user or root, "
1446                                    "ignoring it (use -f to override).\n", dso->name);
1447                         goto out;
1448                 }
1449
1450                 ret = dso__load_perf_map(dso, map, filter);
1451                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1452                                              DSO_BINARY_TYPE__NOT_FOUND;
1453                 goto out;
1454         }
1455
1456         if (machine)
1457                 root_dir = machine->root_dir;
1458
1459         name = malloc(PATH_MAX);
1460         if (!name)
1461                 goto out;
1462
1463         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1464                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1465                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1466                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1467
1468
1469         /*
1470          * Read the build id if possible. This is required for
1471          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1472          */
1473         if (filename__read_build_id(dso->name, build_id, BUILD_ID_SIZE) > 0)
1474                 dso__set_build_id(dso, build_id);
1475
1476         /*
1477          * Iterate over candidate debug images.
1478          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1479          * and/or opd section) for processing.
1480          */
1481         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1482                 struct symsrc *ss = &ss_[ss_pos];
1483                 bool next_slot = false;
1484
1485                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1486
1487                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1488                         continue;
1489
1490                 if (dso__read_binary_type_filename(dso, symtab_type,
1491                                                    root_dir, name, PATH_MAX))
1492                         continue;
1493
1494                 /* Name is now the name of the next image to try */
1495                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1496                         continue;
1497
1498                 if (!syms_ss && symsrc__has_symtab(ss)) {
1499                         syms_ss = ss;
1500                         next_slot = true;
1501                         if (!dso->symsrc_filename)
1502                                 dso->symsrc_filename = strdup(name);
1503                 }
1504
1505                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1506                         runtime_ss = ss;
1507                         next_slot = true;
1508                 }
1509
1510                 if (next_slot) {
1511                         ss_pos++;
1512
1513                         if (syms_ss && runtime_ss)
1514                                 break;
1515                 } else {
1516                         symsrc__destroy(ss);
1517                 }
1518
1519         }
1520
1521         if (!runtime_ss && !syms_ss)
1522                 goto out_free;
1523
1524         if (runtime_ss && !syms_ss) {
1525                 syms_ss = runtime_ss;
1526         }
1527
1528         /* We'll have to hope for the best */
1529         if (!runtime_ss && syms_ss)
1530                 runtime_ss = syms_ss;
1531
1532         if (syms_ss)
1533                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1534         else
1535                 ret = -1;
1536
1537         if (ret > 0) {
1538                 int nr_plt;
1539
1540                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1541                 if (nr_plt > 0)
1542                         ret += nr_plt;
1543         }
1544
1545         for (; ss_pos > 0; ss_pos--)
1546                 symsrc__destroy(&ss_[ss_pos - 1]);
1547 out_free:
1548         free(name);
1549         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1550                 ret = 0;
1551 out:
1552         dso__set_loaded(dso, map->type);
1553         pthread_mutex_unlock(&dso->lock);
1554
1555         return ret;
1556 }
1557
1558 struct map *map_groups__find_by_name(struct map_groups *mg,
1559                                      enum map_type type, const char *name)
1560 {
1561         struct maps *maps = &mg->maps[type];
1562         struct map *map;
1563
1564         pthread_rwlock_rdlock(&maps->lock);
1565
1566         for (map = maps__first(maps); map; map = map__next(map)) {
1567                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1568                         goto out_unlock;
1569         }
1570
1571         map = NULL;
1572
1573 out_unlock:
1574         pthread_rwlock_unlock(&maps->lock);
1575         return map;
1576 }
1577
1578 int dso__load_vmlinux(struct dso *dso, struct map *map,
1579                       const char *vmlinux, bool vmlinux_allocated,
1580                       symbol_filter_t filter)
1581 {
1582         int err = -1;
1583         struct symsrc ss;
1584         char symfs_vmlinux[PATH_MAX];
1585         enum dso_binary_type symtab_type;
1586
1587         if (vmlinux[0] == '/')
1588                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1589         else
1590                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1591
1592         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1593                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1594         else
1595                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1596
1597         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1598                 return -1;
1599
1600         err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1601         symsrc__destroy(&ss);
1602
1603         if (err > 0) {
1604                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1605                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1606                 else
1607                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1608                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1609                 dso__set_loaded(dso, map->type);
1610                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1611         }
1612
1613         return err;
1614 }
1615
1616 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1617                            symbol_filter_t filter)
1618 {
1619         int i, err = 0;
1620         char *filename = NULL;
1621
1622         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1623                  vmlinux_path__nr_entries + 1);
1624
1625         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1626                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1627                 if (err > 0)
1628                         goto out;
1629         }
1630
1631         if (!symbol_conf.ignore_vmlinux_buildid)
1632                 filename = dso__build_id_filename(dso, NULL, 0);
1633         if (filename != NULL) {
1634                 err = dso__load_vmlinux(dso, map, filename, true, filter);
1635                 if (err > 0)
1636                         goto out;
1637                 free(filename);
1638         }
1639 out:
1640         return err;
1641 }
1642
1643 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1644 {
1645         char kallsyms_filename[PATH_MAX];
1646         struct dirent *dent;
1647         int ret = -1;
1648         DIR *d;
1649
1650         d = opendir(dir);
1651         if (!d)
1652                 return -1;
1653
1654         while (1) {
1655                 dent = readdir(d);
1656                 if (!dent)
1657                         break;
1658                 if (dent->d_type != DT_DIR)
1659                         continue;
1660                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1661                           "%s/%s/kallsyms", dir, dent->d_name);
1662                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1663                         strlcpy(dir, kallsyms_filename, dir_sz);
1664                         ret = 0;
1665                         break;
1666                 }
1667         }
1668
1669         closedir(d);
1670
1671         return ret;
1672 }
1673
1674 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1675 {
1676         u8 host_build_id[BUILD_ID_SIZE];
1677         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1678         bool is_host = false;
1679         char path[PATH_MAX];
1680
1681         if (!dso->has_build_id) {
1682                 /*
1683                  * Last resort, if we don't have a build-id and couldn't find
1684                  * any vmlinux file, try the running kernel kallsyms table.
1685                  */
1686                 goto proc_kallsyms;
1687         }
1688
1689         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1690                                  sizeof(host_build_id)) == 0)
1691                 is_host = dso__build_id_equal(dso, host_build_id);
1692
1693         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1694
1695         scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1696                   sbuild_id);
1697
1698         /* Use /proc/kallsyms if possible */
1699         if (is_host) {
1700                 DIR *d;
1701                 int fd;
1702
1703                 /* If no cached kcore go with /proc/kallsyms */
1704                 d = opendir(path);
1705                 if (!d)
1706                         goto proc_kallsyms;
1707                 closedir(d);
1708
1709                 /*
1710                  * Do not check the build-id cache, until we know we cannot use
1711                  * /proc/kcore.
1712                  */
1713                 fd = open("/proc/kcore", O_RDONLY);
1714                 if (fd != -1) {
1715                         close(fd);
1716                         /* If module maps match go with /proc/kallsyms */
1717                         if (!validate_kcore_addresses("/proc/kallsyms", map))
1718                                 goto proc_kallsyms;
1719                 }
1720
1721                 /* Find kallsyms in build-id cache with kcore */
1722                 if (!find_matching_kcore(map, path, sizeof(path)))
1723                         return strdup(path);
1724
1725                 goto proc_kallsyms;
1726         }
1727
1728         /* Find kallsyms in build-id cache with kcore */
1729         if (!find_matching_kcore(map, path, sizeof(path)))
1730                 return strdup(path);
1731
1732         scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1733                   buildid_dir, sbuild_id);
1734
1735         if (access(path, F_OK)) {
1736                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1737                        sbuild_id);
1738                 return NULL;
1739         }
1740
1741         return strdup(path);
1742
1743 proc_kallsyms:
1744         return strdup("/proc/kallsyms");
1745 }
1746
1747 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1748                                 symbol_filter_t filter)
1749 {
1750         int err;
1751         const char *kallsyms_filename = NULL;
1752         char *kallsyms_allocated_filename = NULL;
1753         /*
1754          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1755          * it and only it, reporting errors to the user if it cannot be used.
1756          *
1757          * For instance, try to analyse an ARM perf.data file _without_ a
1758          * build-id, or if the user specifies the wrong path to the right
1759          * vmlinux file, obviously we can't fallback to another vmlinux (a
1760          * x86_86 one, on the machine where analysis is being performed, say),
1761          * or worse, /proc/kallsyms.
1762          *
1763          * If the specified file _has_ a build-id and there is a build-id
1764          * section in the perf.data file, we will still do the expected
1765          * validation in dso__load_vmlinux and will bail out if they don't
1766          * match.
1767          */
1768         if (symbol_conf.kallsyms_name != NULL) {
1769                 kallsyms_filename = symbol_conf.kallsyms_name;
1770                 goto do_kallsyms;
1771         }
1772
1773         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1774                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1775                                          false, filter);
1776         }
1777
1778         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1779                 err = dso__load_vmlinux_path(dso, map, filter);
1780                 if (err > 0)
1781                         return err;
1782         }
1783
1784         /* do not try local files if a symfs was given */
1785         if (symbol_conf.symfs[0] != 0)
1786                 return -1;
1787
1788         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1789         if (!kallsyms_allocated_filename)
1790                 return -1;
1791
1792         kallsyms_filename = kallsyms_allocated_filename;
1793
1794 do_kallsyms:
1795         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1796         if (err > 0)
1797                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1798         free(kallsyms_allocated_filename);
1799
1800         if (err > 0 && !dso__is_kcore(dso)) {
1801                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1802                 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1803                 map__fixup_start(map);
1804                 map__fixup_end(map);
1805         }
1806
1807         return err;
1808 }
1809
1810 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1811                                       symbol_filter_t filter)
1812 {
1813         int err;
1814         const char *kallsyms_filename = NULL;
1815         struct machine *machine;
1816         char path[PATH_MAX];
1817
1818         if (!map->groups) {
1819                 pr_debug("Guest kernel map hasn't the point to groups\n");
1820                 return -1;
1821         }
1822         machine = map->groups->machine;
1823
1824         if (machine__is_default_guest(machine)) {
1825                 /*
1826                  * if the user specified a vmlinux filename, use it and only
1827                  * it, reporting errors to the user if it cannot be used.
1828                  * Or use file guest_kallsyms inputted by user on commandline
1829                  */
1830                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1831                         err = dso__load_vmlinux(dso, map,
1832                                                 symbol_conf.default_guest_vmlinux_name,
1833                                                 false, filter);
1834                         return err;
1835                 }
1836
1837                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1838                 if (!kallsyms_filename)
1839                         return -1;
1840         } else {
1841                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1842                 kallsyms_filename = path;
1843         }
1844
1845         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1846         if (err > 0)
1847                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1848         if (err > 0 && !dso__is_kcore(dso)) {
1849                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1850                 machine__mmap_name(machine, path, sizeof(path));
1851                 dso__set_long_name(dso, strdup(path), true);
1852                 map__fixup_start(map);
1853                 map__fixup_end(map);
1854         }
1855
1856         return err;
1857 }
1858
1859 static void vmlinux_path__exit(void)
1860 {
1861         while (--vmlinux_path__nr_entries >= 0)
1862                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1863         vmlinux_path__nr_entries = 0;
1864
1865         zfree(&vmlinux_path);
1866 }
1867
1868 static int vmlinux_path__init(struct perf_env *env)
1869 {
1870         struct utsname uts;
1871         char bf[PATH_MAX];
1872         char *kernel_version;
1873
1874         vmlinux_path = malloc(sizeof(char *) * 6);
1875         if (vmlinux_path == NULL)
1876                 return -1;
1877
1878         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1879         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1880                 goto out_fail;
1881         ++vmlinux_path__nr_entries;
1882         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1883         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1884                 goto out_fail;
1885         ++vmlinux_path__nr_entries;
1886
1887         /* only try kernel version if no symfs was given */
1888         if (symbol_conf.symfs[0] != 0)
1889                 return 0;
1890
1891         if (env) {
1892                 kernel_version = env->os_release;
1893         } else {
1894                 if (uname(&uts) < 0)
1895                         goto out_fail;
1896
1897                 kernel_version = uts.release;
1898         }
1899
1900         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1901         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1902         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1903                 goto out_fail;
1904         ++vmlinux_path__nr_entries;
1905         snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
1906                  kernel_version);
1907         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1908         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1909                 goto out_fail;
1910         ++vmlinux_path__nr_entries;
1911         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1912         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1913         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1914                 goto out_fail;
1915         ++vmlinux_path__nr_entries;
1916         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1917                  kernel_version);
1918         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1919         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1920                 goto out_fail;
1921         ++vmlinux_path__nr_entries;
1922
1923         return 0;
1924
1925 out_fail:
1926         vmlinux_path__exit();
1927         return -1;
1928 }
1929
1930 int setup_list(struct strlist **list, const char *list_str,
1931                       const char *list_name)
1932 {
1933         if (list_str == NULL)
1934                 return 0;
1935
1936         *list = strlist__new(list_str, NULL);
1937         if (!*list) {
1938                 pr_err("problems parsing %s list\n", list_name);
1939                 return -1;
1940         }
1941
1942         symbol_conf.has_filter = true;
1943         return 0;
1944 }
1945
1946 int setup_intlist(struct intlist **list, const char *list_str,
1947                   const char *list_name)
1948 {
1949         if (list_str == NULL)
1950                 return 0;
1951
1952         *list = intlist__new(list_str);
1953         if (!*list) {
1954                 pr_err("problems parsing %s list\n", list_name);
1955                 return -1;
1956         }
1957         return 0;
1958 }
1959
1960 static bool symbol__read_kptr_restrict(void)
1961 {
1962         bool value = false;
1963
1964         if (geteuid() != 0) {
1965                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1966                 if (fp != NULL) {
1967                         char line[8];
1968
1969                         if (fgets(line, sizeof(line), fp) != NULL)
1970                                 value = atoi(line) != 0;
1971
1972                         fclose(fp);
1973                 }
1974         }
1975
1976         return value;
1977 }
1978
1979 int symbol__init(struct perf_env *env)
1980 {
1981         const char *symfs;
1982
1983         if (symbol_conf.initialized)
1984                 return 0;
1985
1986         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1987
1988         symbol__elf_init();
1989
1990         if (symbol_conf.sort_by_name)
1991                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1992                                           sizeof(struct symbol));
1993
1994         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1995                 return -1;
1996
1997         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1998                 pr_err("'.' is the only non valid --field-separator argument\n");
1999                 return -1;
2000         }
2001
2002         if (setup_list(&symbol_conf.dso_list,
2003                        symbol_conf.dso_list_str, "dso") < 0)
2004                 return -1;
2005
2006         if (setup_list(&symbol_conf.comm_list,
2007                        symbol_conf.comm_list_str, "comm") < 0)
2008                 goto out_free_dso_list;
2009
2010         if (setup_intlist(&symbol_conf.pid_list,
2011                        symbol_conf.pid_list_str, "pid") < 0)
2012                 goto out_free_comm_list;
2013
2014         if (setup_intlist(&symbol_conf.tid_list,
2015                        symbol_conf.tid_list_str, "tid") < 0)
2016                 goto out_free_pid_list;
2017
2018         if (setup_list(&symbol_conf.sym_list,
2019                        symbol_conf.sym_list_str, "symbol") < 0)
2020                 goto out_free_tid_list;
2021
2022         /*
2023          * A path to symbols of "/" is identical to ""
2024          * reset here for simplicity.
2025          */
2026         symfs = realpath(symbol_conf.symfs, NULL);
2027         if (symfs == NULL)
2028                 symfs = symbol_conf.symfs;
2029         if (strcmp(symfs, "/") == 0)
2030                 symbol_conf.symfs = "";
2031         if (symfs != symbol_conf.symfs)
2032                 free((void *)symfs);
2033
2034         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2035
2036         symbol_conf.initialized = true;
2037         return 0;
2038
2039 out_free_tid_list:
2040         intlist__delete(symbol_conf.tid_list);
2041 out_free_pid_list:
2042         intlist__delete(symbol_conf.pid_list);
2043 out_free_comm_list:
2044         strlist__delete(symbol_conf.comm_list);
2045 out_free_dso_list:
2046         strlist__delete(symbol_conf.dso_list);
2047         return -1;
2048 }
2049
2050 void symbol__exit(void)
2051 {
2052         if (!symbol_conf.initialized)
2053                 return;
2054         strlist__delete(symbol_conf.sym_list);
2055         strlist__delete(symbol_conf.dso_list);
2056         strlist__delete(symbol_conf.comm_list);
2057         intlist__delete(symbol_conf.tid_list);
2058         intlist__delete(symbol_conf.pid_list);
2059         vmlinux_path__exit();
2060         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2061         symbol_conf.initialized = false;
2062 }