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 <linux/kernel.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <sys/param.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <inttypes.h>
  13 #include "annotate.h"
  14 #include "build-id.h"
  15 #include "util.h"
  16 #include "debug.h"
  17 #include "machine.h"
  18 #include "symbol.h"
  19 #include "strlist.h"
  20 #include "intlist.h"
  21 #include "header.h"
  22 #include "path.h"
  23 #include "sane_ctype.h"
  24
  25 #include <elf.h>
  26 #include <limits.h>
  27 #include <symbol/kallsyms.h>
  28 #include <sys/utsname.h>
  29
  30 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
  31 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
  32 static bool symbol__is_idle(const char *name);
  33
  34 int vmlinux_path__nr_entries;
  35 char **vmlinux_path;
  36
  37 struct symbol_conf symbol_conf = {
  38         .use_modules            = true,
  39         .try_vmlinux_path       = true,
  40         .annotate_src           = true,
  41         .demangle               = true,
  42         .demangle_kernel        = false,
  43         .cumulate_callchain     = true,
  44         .show_hist_headers      = true,
  45         .symfs                  = "",
  46         .event_group            = true,
  47 };
  48
  49 static enum dso_binary_type binary_type_symtab[] = {
  50         DSO_BINARY_TYPE__KALLSYMS,
  51         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  52         DSO_BINARY_TYPE__JAVA_JIT,
  53         DSO_BINARY_TYPE__DEBUGLINK,
  54         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  55         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  56         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  57         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  58         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  59         DSO_BINARY_TYPE__GUEST_KMODULE,
  60         DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  61         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  62         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  63         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  64         DSO_BINARY_TYPE__NOT_FOUND,
  65 };
  66
  67 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  68
  69 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  70 {
  71         symbol_type = toupper(symbol_type);
  72
  73         switch (map_type) {
  74         case MAP__FUNCTION:
  75                 return symbol_type == 'T' || symbol_type == 'W';
  76         case MAP__VARIABLE:
  77                 return symbol_type == 'D';
  78         default:
  79                 return false;
  80         }
  81 }
  82
  83 static int prefix_underscores_count(const char *str)
  84 {
  85         const char *tail = str;
  86
  87         while (*tail == '_')
  88                 tail++;
  89
  90         return tail - str;
  91 }
  92
  93 int __weak arch__choose_best_symbol(struct symbol *syma,
  94                                     struct symbol *symb __maybe_unused)
  95 {
  96         /* Avoid "SyS" kernel syscall aliases */
  97         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
  98                 return SYMBOL_B;
  99         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 100                 return SYMBOL_B;
 101
 102         return SYMBOL_A;
 103 }
 104
 105 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 106 {
 107         s64 a;
 108         s64 b;
 109         size_t na, nb;
 110
 111         /* Prefer a symbol with non zero length */
 112         a = syma->end - syma->start;
 113         b = symb->end - symb->start;
 114         if ((b == 0) && (a > 0))
 115                 return SYMBOL_A;
 116         else if ((a == 0) && (b > 0))
 117                 return SYMBOL_B;
 118
 119         /* Prefer a non weak symbol over a weak one */
 120         a = syma->binding == STB_WEAK;
 121         b = symb->binding == STB_WEAK;
 122         if (b && !a)
 123                 return SYMBOL_A;
 124         if (a && !b)
 125                 return SYMBOL_B;
 126
 127         /* Prefer a global symbol over a non global one */
 128         a = syma->binding == STB_GLOBAL;
 129         b = symb->binding == STB_GLOBAL;
 130         if (a && !b)
 131                 return SYMBOL_A;
 132         if (b && !a)
 133                 return SYMBOL_B;
 134
 135         /* Prefer a symbol with less underscores */
 136         a = prefix_underscores_count(syma->name);
 137         b = prefix_underscores_count(symb->name);
 138         if (b > a)
 139                 return SYMBOL_A;
 140         else if (a > b)
 141                 return SYMBOL_B;
 142
 143         /* Choose the symbol with the longest name */
 144         na = strlen(syma->name);
 145         nb = strlen(symb->name);
 146         if (na > nb)
 147                 return SYMBOL_A;
 148         else if (na < nb)
 149                 return SYMBOL_B;
 150
 151         return arch__choose_best_symbol(syma, symb);
 152 }
 153
 154 void symbols__fixup_duplicate(struct rb_root *symbols)
 155 {
 156         struct rb_node *nd;
 157         struct symbol *curr, *next;
 158
 159         if (symbol_conf.allow_aliases)
 160                 return;
 161
 162         nd = rb_first(symbols);
 163
 164         while (nd) {
 165                 curr = rb_entry(nd, struct symbol, rb_node);
 166 again:
 167                 nd = rb_next(&curr->rb_node);
 168                 next = rb_entry(nd, struct symbol, rb_node);
 169
 170                 if (!nd)
 171                         break;
 172
 173                 if (curr->start != next->start)
 174                         continue;
 175
 176                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 177                         rb_erase(&next->rb_node, symbols);
 178                         symbol__delete(next);
 179                         goto again;
 180                 } else {
 181                         nd = rb_next(&curr->rb_node);
 182                         rb_erase(&curr->rb_node, symbols);
 183                         symbol__delete(curr);
 184                 }
 185         }
 186 }
 187
 188 void symbols__fixup_end(struct rb_root *symbols)
 189 {
 190         struct rb_node *nd, *prevnd = rb_first(symbols);
 191         struct symbol *curr, *prev;
 192
 193         if (prevnd == NULL)
 194                 return;
 195
 196         curr = rb_entry(prevnd, struct symbol, rb_node);
 197
 198         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 199                 prev = curr;
 200                 curr = rb_entry(nd, struct symbol, rb_node);
 201
 202                 if (prev->end == prev->start && prev->end != curr->start)
 203                         prev->end = curr->start;
 204         }
 205
 206         /* Last entry */
 207         if (curr->end == curr->start)
 208                 curr->end = roundup(curr->start, 4096) + 4096;
 209 }
 210
 211 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 212 {
 213         struct maps *maps = &mg->maps[type];
 214         struct map *next, *curr;
 215
 216         pthread_rwlock_wrlock(&maps->lock);
 217
 218         curr = maps__first(maps);
 219         if (curr == NULL)
 220                 goto out_unlock;
 221
 222         for (next = map__next(curr); next; next = map__next(curr)) {
 223                 curr->end = next->start;
 224                 curr = next;
 225         }
 226
 227         /*
 228          * We still haven't the actual symbols, so guess the
 229          * last map final address.
 230          */
 231         curr->end = ~0ULL;
 232
 233 out_unlock:
 234         pthread_rwlock_unlock(&maps->lock);
 235 }
 236
 237 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 238 {
 239         size_t namelen = strlen(name) + 1;
 240         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 241                                         sizeof(*sym) + namelen));
 242         if (sym == NULL)
 243                 return NULL;
 244
 245         if (symbol_conf.priv_size) {
 246                 if (symbol_conf.init_annotation) {
 247                         struct annotation *notes = (void *)sym;
 248                         pthread_mutex_init(&notes->lock, NULL);
 249                 }
 250                 sym = ((void *)sym) + symbol_conf.priv_size;
 251         }
 252
 253         sym->start   = start;
 254         sym->end     = len ? start + len : start;
 255         sym->binding = binding;
 256         sym->namelen = namelen - 1;
 257
 258         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 259                   __func__, name, start, sym->end);
 260         memcpy(sym->name, name, namelen);
 261
 262         return sym;
 263 }
 264
 265 void symbol__delete(struct symbol *sym)
 266 {
 267         free(((void *)sym) - symbol_conf.priv_size);
 268 }
 269
 270 void symbols__delete(struct rb_root *symbols)
 271 {
 272         struct symbol *pos;
 273         struct rb_node *next = rb_first(symbols);
 274
 275         while (next) {
 276                 pos = rb_entry(next, struct symbol, rb_node);
 277                 next = rb_next(&pos->rb_node);
 278                 rb_erase(&pos->rb_node, symbols);
 279                 symbol__delete(pos);
 280         }
 281 }
 282
 283 void __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel)
 284 {
 285         struct rb_node **p = &symbols->rb_node;
 286         struct rb_node *parent = NULL;
 287         const u64 ip = sym->start;
 288         struct symbol *s;
 289
 290         if (kernel) {
 291                 const char *name = sym->name;
 292                 /*
 293                  * ppc64 uses function descriptors and appends a '.' to the
 294                  * start of every instruction address. Remove it.
 295                  */
 296                 if (name[0] == '.')
 297                         name++;
 298                 sym->idle = symbol__is_idle(name);
 299         }
 300
 301         while (*p != NULL) {
 302                 parent = *p;
 303                 s = rb_entry(parent, struct symbol, rb_node);
 304                 if (ip < s->start)
 305                         p = &(*p)->rb_left;
 306                 else
 307                         p = &(*p)->rb_right;
 308         }
 309         rb_link_node(&sym->rb_node, parent, p);
 310         rb_insert_color(&sym->rb_node, symbols);
 311 }
 312
 313 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 314 {
 315         __symbols__insert(symbols, sym, false);
 316 }
 317
 318 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
 319 {
 320         struct rb_node *n;
 321
 322         if (symbols == NULL)
 323                 return NULL;
 324
 325         n = symbols->rb_node;
 326
 327         while (n) {
 328                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 329
 330                 if (ip < s->start)
 331                         n = n->rb_left;
 332                 else if (ip > s->end || (ip == s->end && ip != s->start))
 333                         n = n->rb_right;
 334                 else
 335                         return s;
 336         }
 337
 338         return NULL;
 339 }
 340
 341 static struct symbol *symbols__first(struct rb_root *symbols)
 342 {
 343         struct rb_node *n = rb_first(symbols);
 344
 345         if (n)
 346                 return rb_entry(n, struct symbol, rb_node);
 347
 348         return NULL;
 349 }
 350
 351 static struct symbol *symbols__last(struct rb_root *symbols)
 352 {
 353         struct rb_node *n = rb_last(symbols);
 354
 355         if (n)
 356                 return rb_entry(n, struct symbol, rb_node);
 357
 358         return NULL;
 359 }
 360
 361 static struct symbol *symbols__next(struct symbol *sym)
 362 {
 363         struct rb_node *n = rb_next(&sym->rb_node);
 364
 365         if (n)
 366                 return rb_entry(n, struct symbol, rb_node);
 367
 368         return NULL;
 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 void dso__insert_symbol(struct dso *dso, enum map_type type, struct symbol *sym)
 455 {
 456         __symbols__insert(&dso->symbols[type], sym, dso->kernel);
 457
 458         /* update the symbol cache if necessary */
 459         if (dso->last_find_result[type].addr >= sym->start &&
 460             (dso->last_find_result[type].addr < sym->end ||
 461             sym->start == sym->end)) {
 462                 dso->last_find_result[type].symbol = sym;
 463         }
 464 }
 465
 466 struct symbol *dso__find_symbol(struct dso *dso,
 467                                 enum map_type type, u64 addr)
 468 {
 469         if (dso->last_find_result[type].addr != addr) {
 470                 dso->last_find_result[type].addr   = addr;
 471                 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr);
 472         }
 473
 474         return dso->last_find_result[type].symbol;
 475 }
 476
 477 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 478 {
 479         return symbols__first(&dso->symbols[type]);
 480 }
 481
 482 struct symbol *dso__last_symbol(struct dso *dso, enum map_type type)
 483 {
 484         return symbols__last(&dso->symbols[type]);
 485 }
 486
 487 struct symbol *dso__next_symbol(struct symbol *sym)
 488 {
 489         return symbols__next(sym);
 490 }
 491
 492 struct symbol *symbol__next_by_name(struct symbol *sym)
 493 {
 494         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 495         struct rb_node *n = rb_next(&s->rb_node);
 496
 497         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 498 }
 499
 500  /*
 501   * Teturns first symbol that matched with @name.
 502   */
 503 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 504                                         const char *name)
 505 {
 506         return symbols__find_by_name(&dso->symbol_names[type], name);
 507 }
 508
 509 void dso__sort_by_name(struct dso *dso, enum map_type type)
 510 {
 511         dso__set_sorted_by_name(dso, type);
 512         return symbols__sort_by_name(&dso->symbol_names[type],
 513                                      &dso->symbols[type]);
 514 }
 515
 516 int modules__parse(const char *filename, void *arg,
 517                    int (*process_module)(void *arg, const char *name,
 518                                          u64 start))
 519 {
 520         char *line = NULL;
 521         size_t n;
 522         FILE *file;
 523         int err = 0;
 524
 525         file = fopen(filename, "r");
 526         if (file == NULL)
 527                 return -1;
 528
 529         while (1) {
 530                 char name[PATH_MAX];
 531                 u64 start;
 532                 char *sep;
 533                 ssize_t line_len;
 534
 535                 line_len = getline(&line, &n, file);
 536                 if (line_len < 0) {
 537                         if (feof(file))
 538                                 break;
 539                         err = -1;
 540                         goto out;
 541                 }
 542
 543                 if (!line) {
 544                         err = -1;
 545                         goto out;
 546                 }
 547
 548                 line[--line_len] = '\0'; /* \n */
 549
 550                 sep = strrchr(line, 'x');
 551                 if (sep == NULL)
 552                         continue;
 553
 554                 hex2u64(sep + 1, &start);
 555
 556                 sep = strchr(line, ' ');
 557                 if (sep == NULL)
 558                         continue;
 559
 560                 *sep = '\0';
 561
 562                 scnprintf(name, sizeof(name), "[%s]", line);
 563
 564                 err = process_module(arg, name, start);
 565                 if (err)
 566                         break;
 567         }
 568 out:
 569         free(line);
 570         fclose(file);
 571         return err;
 572 }
 573
 574 struct process_kallsyms_args {
 575         struct map *map;
 576         struct dso *dso;
 577 };
 578
 579 /*
 580  * These are symbols in the kernel image, so make sure that
 581  * sym is from a kernel DSO.
 582  */
 583 static bool symbol__is_idle(const char *name)
 584 {
 585         const char * const idle_symbols[] = {
 586                 "cpu_idle",
 587                 "cpu_startup_entry",
 588                 "intel_idle",
 589                 "default_idle",
 590                 "native_safe_halt",
 591                 "enter_idle",
 592                 "exit_idle",
 593                 "mwait_idle",
 594                 "mwait_idle_with_hints",
 595                 "poll_idle",
 596                 "ppc64_runlatch_off",
 597                 "pseries_dedicated_idle_sleep",
 598                 NULL
 599         };
 600         int i;
 601
 602         for (i = 0; idle_symbols[i]; i++) {
 603                 if (!strcmp(idle_symbols[i], name))
 604                         return true;
 605         }
 606
 607         return false;
 608 }
 609
 610 static int map__process_kallsym_symbol(void *arg, const char *name,
 611                                        char type, u64 start)
 612 {
 613         struct symbol *sym;
 614         struct process_kallsyms_args *a = arg;
 615         struct rb_root *root = &a->dso->symbols[a->map->type];
 616
 617         if (!symbol_type__is_a(type, a->map->type))
 618                 return 0;
 619
 620         /*
 621          * module symbols are not sorted so we add all
 622          * symbols, setting length to 0, and rely on
 623          * symbols__fixup_end() to fix it up.
 624          */
 625         sym = symbol__new(start, 0, kallsyms2elf_binding(type), name);
 626         if (sym == NULL)
 627                 return -ENOMEM;
 628         /*
 629          * We will pass the symbols to the filter later, in
 630          * map__split_kallsyms, when we have split the maps per module
 631          */
 632         __symbols__insert(root, sym, !strchr(name, '['));
 633
 634         return 0;
 635 }
 636
 637 /*
 638  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 639  * so that we can in the next step set the symbol ->end address and then
 640  * call kernel_maps__split_kallsyms.
 641  */
 642 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 643                                   struct map *map)
 644 {
 645         struct process_kallsyms_args args = { .map = map, .dso = dso, };
 646         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 647 }
 648
 649 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map)
 650 {
 651         struct map_groups *kmaps = map__kmaps(map);
 652         struct map *curr_map;
 653         struct symbol *pos;
 654         int count = 0;
 655         struct rb_root old_root = dso->symbols[map->type];
 656         struct rb_root *root = &dso->symbols[map->type];
 657         struct rb_node *next = rb_first(root);
 658
 659         if (!kmaps)
 660                 return -1;
 661
 662         *root = RB_ROOT;
 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                 rb_erase_init(&pos->rb_node, &old_root);
 671
 672                 module = strchr(pos->name, '\t');
 673                 if (module)
 674                         *module = '\0';
 675
 676                 curr_map = map_groups__find(kmaps, map->type, pos->start);
 677
 678                 if (!curr_map) {
 679                         symbol__delete(pos);
 680                         continue;
 681                 }
 682
 683                 pos->start -= curr_map->start - curr_map->pgoff;
 684                 if (pos->end)
 685                         pos->end -= curr_map->start - curr_map->pgoff;
 686                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 687                 ++count;
 688         }
 689
 690         /* Symbols have been adjusted */
 691         dso->adjust_symbols = 1;
 692
 693         return count;
 694 }
 695
 696 /*
 697  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 698  * kernel range is broken in several maps, named [kernel].N, as we don't have
 699  * the original ELF section names vmlinux have.
 700  */
 701 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta)
 702 {
 703         struct map_groups *kmaps = map__kmaps(map);
 704         struct machine *machine;
 705         struct map *curr_map = map;
 706         struct symbol *pos;
 707         int count = 0, moved = 0;
 708         struct rb_root *root = &dso->symbols[map->type];
 709         struct rb_node *next = rb_first(root);
 710         int kernel_range = 0;
 711
 712         if (!kmaps)
 713                 return -1;
 714
 715         machine = kmaps->machine;
 716
 717         while (next) {
 718                 char *module;
 719
 720                 pos = rb_entry(next, struct symbol, rb_node);
 721                 next = rb_next(&pos->rb_node);
 722
 723                 module = strchr(pos->name, '\t');
 724                 if (module) {
 725                         if (!symbol_conf.use_modules)
 726                                 goto discard_symbol;
 727
 728                         *module++ = '\0';
 729
 730                         if (strcmp(curr_map->dso->short_name, module)) {
 731                                 if (curr_map != map &&
 732                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 733                                     machine__is_default_guest(machine)) {
 734                                         /*
 735                                          * We assume all symbols of a module are
 736                                          * continuous in * kallsyms, so curr_map
 737                                          * points to a module and all its
 738                                          * symbols are in its kmap. Mark it as
 739                                          * loaded.
 740                                          */
 741                                         dso__set_loaded(curr_map->dso,
 742                                                         curr_map->type);
 743                                 }
 744
 745                                 curr_map = map_groups__find_by_name(kmaps,
 746                                                         map->type, module);
 747                                 if (curr_map == NULL) {
 748                                         pr_debug("%s/proc/{kallsyms,modules} "
 749                                                  "inconsistency while looking "
 750                                                  "for \"%s\" module!\n",
 751                                                  machine->root_dir, module);
 752                                         curr_map = map;
 753                                         goto discard_symbol;
 754                                 }
 755
 756                                 if (curr_map->dso->loaded &&
 757                                     !machine__is_default_guest(machine))
 758                                         goto discard_symbol;
 759                         }
 760                         /*
 761                          * So that we look just like we get from .ko files,
 762                          * i.e. not prelinked, relative to map->start.
 763                          */
 764                         pos->start = curr_map->map_ip(curr_map, pos->start);
 765                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 766                 } else if (curr_map != map) {
 767                         char dso_name[PATH_MAX];
 768                         struct dso *ndso;
 769
 770                         if (delta) {
 771                                 /* Kernel was relocated at boot time */
 772                                 pos->start -= delta;
 773                                 pos->end -= delta;
 774                         }
 775
 776                         if (count == 0) {
 777                                 curr_map = map;
 778                                 goto add_symbol;
 779                         }
 780
 781                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 782                                 snprintf(dso_name, sizeof(dso_name),
 783                                         "[guest.kernel].%d",
 784                                         kernel_range++);
 785                         else
 786                                 snprintf(dso_name, sizeof(dso_name),
 787                                         "[kernel].%d",
 788                                         kernel_range++);
 789
 790                         ndso = dso__new(dso_name);
 791                         if (ndso == NULL)
 792                                 return -1;
 793
 794                         ndso->kernel = dso->kernel;
 795
 796                         curr_map = map__new2(pos->start, ndso, map->type);
 797                         if (curr_map == NULL) {
 798                                 dso__put(ndso);
 799                                 return -1;
 800                         }
 801
 802                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 803                         map_groups__insert(kmaps, curr_map);
 804                         ++kernel_range;
 805                 } else if (delta) {
 806                         /* Kernel was relocated at boot time */
 807                         pos->start -= delta;
 808                         pos->end -= delta;
 809                 }
 810 add_symbol:
 811                 if (curr_map != map) {
 812                         rb_erase(&pos->rb_node, root);
 813                         symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 814                         ++moved;
 815                 } else
 816                         ++count;
 817
 818                 continue;
 819 discard_symbol:
 820                 rb_erase(&pos->rb_node, root);
 821                 symbol__delete(pos);
 822         }
 823
 824         if (curr_map != map &&
 825             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 826             machine__is_default_guest(kmaps->machine)) {
 827                 dso__set_loaded(curr_map->dso, curr_map->type);
 828         }
 829
 830         return count + moved;
 831 }
 832
 833 bool symbol__restricted_filename(const char *filename,
 834                                  const char *restricted_filename)
 835 {
 836         bool restricted = false;
 837
 838         if (symbol_conf.kptr_restrict) {
 839                 char *r = realpath(filename, NULL);
 840
 841                 if (r != NULL) {
 842                         restricted = strcmp(r, restricted_filename) == 0;
 843                         free(r);
 844                         return restricted;
 845                 }
 846         }
 847
 848         return restricted;
 849 }
 850
 851 struct module_info {
 852         struct rb_node rb_node;
 853         char *name;
 854         u64 start;
 855 };
 856
 857 static void add_module(struct module_info *mi, struct rb_root *modules)
 858 {
 859         struct rb_node **p = &modules->rb_node;
 860         struct rb_node *parent = NULL;
 861         struct module_info *m;
 862
 863         while (*p != NULL) {
 864                 parent = *p;
 865                 m = rb_entry(parent, struct module_info, rb_node);
 866                 if (strcmp(mi->name, m->name) < 0)
 867                         p = &(*p)->rb_left;
 868                 else
 869                         p = &(*p)->rb_right;
 870         }
 871         rb_link_node(&mi->rb_node, parent, p);
 872         rb_insert_color(&mi->rb_node, modules);
 873 }
 874
 875 static void delete_modules(struct rb_root *modules)
 876 {
 877         struct module_info *mi;
 878         struct rb_node *next = rb_first(modules);
 879
 880         while (next) {
 881                 mi = rb_entry(next, struct module_info, rb_node);
 882                 next = rb_next(&mi->rb_node);
 883                 rb_erase(&mi->rb_node, modules);
 884                 zfree(&mi->name);
 885                 free(mi);
 886         }
 887 }
 888
 889 static struct module_info *find_module(const char *name,
 890                                        struct rb_root *modules)
 891 {
 892         struct rb_node *n = modules->rb_node;
 893
 894         while (n) {
 895                 struct module_info *m;
 896                 int cmp;
 897
 898                 m = rb_entry(n, struct module_info, rb_node);
 899                 cmp = strcmp(name, m->name);
 900                 if (cmp < 0)
 901                         n = n->rb_left;
 902                 else if (cmp > 0)
 903                         n = n->rb_right;
 904                 else
 905                         return m;
 906         }
 907
 908         return NULL;
 909 }
 910
 911 static int __read_proc_modules(void *arg, const char *name, u64 start)
 912 {
 913         struct rb_root *modules = arg;
 914         struct module_info *mi;
 915
 916         mi = zalloc(sizeof(struct module_info));
 917         if (!mi)
 918                 return -ENOMEM;
 919
 920         mi->name = strdup(name);
 921         mi->start = start;
 922
 923         if (!mi->name) {
 924                 free(mi);
 925                 return -ENOMEM;
 926         }
 927
 928         add_module(mi, modules);
 929
 930         return 0;
 931 }
 932
 933 static int read_proc_modules(const char *filename, struct rb_root *modules)
 934 {
 935         if (symbol__restricted_filename(filename, "/proc/modules"))
 936                 return -1;
 937
 938         if (modules__parse(filename, modules, __read_proc_modules)) {
 939                 delete_modules(modules);
 940                 return -1;
 941         }
 942
 943         return 0;
 944 }
 945
 946 int compare_proc_modules(const char *from, const char *to)
 947 {
 948         struct rb_root from_modules = RB_ROOT;
 949         struct rb_root to_modules = RB_ROOT;
 950         struct rb_node *from_node, *to_node;
 951         struct module_info *from_m, *to_m;
 952         int ret = -1;
 953
 954         if (read_proc_modules(from, &from_modules))
 955                 return -1;
 956
 957         if (read_proc_modules(to, &to_modules))
 958                 goto out_delete_from;
 959
 960         from_node = rb_first(&from_modules);
 961         to_node = rb_first(&to_modules);
 962         while (from_node) {
 963                 if (!to_node)
 964                         break;
 965
 966                 from_m = rb_entry(from_node, struct module_info, rb_node);
 967                 to_m = rb_entry(to_node, struct module_info, rb_node);
 968
 969                 if (from_m->start != to_m->start ||
 970                     strcmp(from_m->name, to_m->name))
 971                         break;
 972
 973                 from_node = rb_next(from_node);
 974                 to_node = rb_next(to_node);
 975         }
 976
 977         if (!from_node && !to_node)
 978                 ret = 0;
 979
 980         delete_modules(&to_modules);
 981 out_delete_from:
 982         delete_modules(&from_modules);
 983
 984         return ret;
 985 }
 986
 987 static int do_validate_kcore_modules(const char *filename, struct map *map,
 988                                   struct map_groups *kmaps)
 989 {
 990         struct rb_root modules = RB_ROOT;
 991         struct map *old_map;
 992         int err;
 993
 994         err = read_proc_modules(filename, &modules);
 995         if (err)
 996                 return err;
 997
 998         old_map = map_groups__first(kmaps, map->type);
 999         while (old_map) {
1000                 struct map *next = map_groups__next(old_map);
1001                 struct module_info *mi;
1002
1003                 if (old_map == map || old_map->start == map->start) {
1004                         /* The kernel map */
1005                         old_map = next;
1006                         continue;
1007                 }
1008
1009                 /* Module must be in memory at the same address */
1010                 mi = find_module(old_map->dso->short_name, &modules);
1011                 if (!mi || mi->start != old_map->start) {
1012                         err = -EINVAL;
1013                         goto out;
1014                 }
1015
1016                 old_map = next;
1017         }
1018 out:
1019         delete_modules(&modules);
1020         return err;
1021 }
1022
1023 /*
1024  * If kallsyms is referenced by name then we look for filename in the same
1025  * directory.
1026  */
1027 static bool filename_from_kallsyms_filename(char *filename,
1028                                             const char *base_name,
1029                                             const char *kallsyms_filename)
1030 {
1031         char *name;
1032
1033         strcpy(filename, kallsyms_filename);
1034         name = strrchr(filename, '/');
1035         if (!name)
1036                 return false;
1037
1038         name += 1;
1039
1040         if (!strcmp(name, "kallsyms")) {
1041                 strcpy(name, base_name);
1042                 return true;
1043         }
1044
1045         return false;
1046 }
1047
1048 static int validate_kcore_modules(const char *kallsyms_filename,
1049                                   struct map *map)
1050 {
1051         struct map_groups *kmaps = map__kmaps(map);
1052         char modules_filename[PATH_MAX];
1053
1054         if (!kmaps)
1055                 return -EINVAL;
1056
1057         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1058                                              kallsyms_filename))
1059                 return -EINVAL;
1060
1061         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1062                 return -EINVAL;
1063
1064         return 0;
1065 }
1066
1067 static int validate_kcore_addresses(const char *kallsyms_filename,
1068                                     struct map *map)
1069 {
1070         struct kmap *kmap = map__kmap(map);
1071
1072         if (!kmap)
1073                 return -EINVAL;
1074
1075         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1076                 u64 start;
1077
1078                 start = kallsyms__get_function_start(kallsyms_filename,
1079                                                      kmap->ref_reloc_sym->name);
1080                 if (start != kmap->ref_reloc_sym->addr)
1081                         return -EINVAL;
1082         }
1083
1084         return validate_kcore_modules(kallsyms_filename, map);
1085 }
1086
1087 struct kcore_mapfn_data {
1088         struct dso *dso;
1089         enum map_type type;
1090         struct list_head maps;
1091 };
1092
1093 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1094 {
1095         struct kcore_mapfn_data *md = data;
1096         struct map *map;
1097
1098         map = map__new2(start, md->dso, md->type);
1099         if (map == NULL)
1100                 return -ENOMEM;
1101
1102         map->end = map->start + len;
1103         map->pgoff = pgoff;
1104
1105         list_add(&map->node, &md->maps);
1106
1107         return 0;
1108 }
1109
1110 static int dso__load_kcore(struct dso *dso, struct map *map,
1111                            const char *kallsyms_filename)
1112 {
1113         struct map_groups *kmaps = map__kmaps(map);
1114         struct machine *machine;
1115         struct kcore_mapfn_data md;
1116         struct map *old_map, *new_map, *replacement_map = NULL;
1117         bool is_64_bit;
1118         int err, fd;
1119         char kcore_filename[PATH_MAX];
1120         struct symbol *sym;
1121
1122         if (!kmaps)
1123                 return -EINVAL;
1124
1125         machine = kmaps->machine;
1126
1127         /* This function requires that the map is the kernel map */
1128         if (map != machine->vmlinux_maps[map->type])
1129                 return -EINVAL;
1130
1131         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1132                                              kallsyms_filename))
1133                 return -EINVAL;
1134
1135         /* Modules and kernel must be present at their original addresses */
1136         if (validate_kcore_addresses(kallsyms_filename, map))
1137                 return -EINVAL;
1138
1139         md.dso = dso;
1140         md.type = map->type;
1141         INIT_LIST_HEAD(&md.maps);
1142
1143         fd = open(kcore_filename, O_RDONLY);
1144         if (fd < 0) {
1145                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1146                          kcore_filename);
1147                 return -EINVAL;
1148         }
1149
1150         /* Read new maps into temporary lists */
1151         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1152                               &is_64_bit);
1153         if (err)
1154                 goto out_err;
1155         dso->is_64_bit = is_64_bit;
1156
1157         if (list_empty(&md.maps)) {
1158                 err = -EINVAL;
1159                 goto out_err;
1160         }
1161
1162         /* Remove old maps */
1163         old_map = map_groups__first(kmaps, map->type);
1164         while (old_map) {
1165                 struct map *next = map_groups__next(old_map);
1166
1167                 if (old_map != map)
1168                         map_groups__remove(kmaps, old_map);
1169                 old_map = next;
1170         }
1171
1172         /* Find the kernel map using the first symbol */
1173         sym = dso__first_symbol(dso, map->type);
1174         list_for_each_entry(new_map, &md.maps, node) {
1175                 if (sym && sym->start >= new_map->start &&
1176                     sym->start < new_map->end) {
1177                         replacement_map = new_map;
1178                         break;
1179                 }
1180         }
1181
1182         if (!replacement_map)
1183                 replacement_map = list_entry(md.maps.next, struct map, node);
1184
1185         /* Add new maps */
1186         while (!list_empty(&md.maps)) {
1187                 new_map = list_entry(md.maps.next, struct map, node);
1188                 list_del_init(&new_map->node);
1189                 if (new_map == replacement_map) {
1190                         map->start      = new_map->start;
1191                         map->end        = new_map->end;
1192                         map->pgoff      = new_map->pgoff;
1193                         map->map_ip     = new_map->map_ip;
1194                         map->unmap_ip   = new_map->unmap_ip;
1195                         /* Ensure maps are correctly ordered */
1196                         map__get(map);
1197                         map_groups__remove(kmaps, map);
1198                         map_groups__insert(kmaps, map);
1199                         map__put(map);
1200                 } else {
1201                         map_groups__insert(kmaps, new_map);
1202                 }
1203
1204                 map__put(new_map);
1205         }
1206
1207         /*
1208          * Set the data type and long name so that kcore can be read via
1209          * dso__data_read_addr().
1210          */
1211         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1212                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1213         else
1214                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1215         dso__set_long_name(dso, strdup(kcore_filename), true);
1216
1217         close(fd);
1218
1219         if (map->type == MAP__FUNCTION)
1220                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1221         else
1222                 pr_debug("Using %s for kernel data\n", kcore_filename);
1223
1224         return 0;
1225
1226 out_err:
1227         while (!list_empty(&md.maps)) {
1228                 map = list_entry(md.maps.next, struct map, node);
1229                 list_del_init(&map->node);
1230                 map__put(map);
1231         }
1232         close(fd);
1233         return -EINVAL;
1234 }
1235
1236 /*
1237  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1238  * delta based on the relocation reference symbol.
1239  */
1240 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1241 {
1242         struct kmap *kmap = map__kmap(map);
1243         u64 addr;
1244
1245         if (!kmap)
1246                 return -1;
1247
1248         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1249                 return 0;
1250
1251         addr = kallsyms__get_function_start(filename,
1252                                             kmap->ref_reloc_sym->name);
1253         if (!addr)
1254                 return -1;
1255
1256         *delta = addr - kmap->ref_reloc_sym->addr;
1257         return 0;
1258 }
1259
1260 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1261                          struct map *map, bool no_kcore)
1262 {
1263         u64 delta = 0;
1264
1265         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1266                 return -1;
1267
1268         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1269                 return -1;
1270
1271         if (kallsyms__delta(map, filename, &delta))
1272                 return -1;
1273
1274         symbols__fixup_end(&dso->symbols[map->type]);
1275         symbols__fixup_duplicate(&dso->symbols[map->type]);
1276
1277         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1278                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1279         else
1280                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1281
1282         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1283                 return dso__split_kallsyms_for_kcore(dso, map);
1284         else
1285                 return dso__split_kallsyms(dso, map, delta);
1286 }
1287
1288 int dso__load_kallsyms(struct dso *dso, const char *filename,
1289                        struct map *map)
1290 {
1291         return __dso__load_kallsyms(dso, filename, map, false);
1292 }
1293
1294 static int dso__load_perf_map(struct dso *dso, struct map *map)
1295 {
1296         char *line = NULL;
1297         size_t n;
1298         FILE *file;
1299         int nr_syms = 0;
1300
1301         file = fopen(dso->long_name, "r");
1302         if (file == NULL)
1303                 goto out_failure;
1304
1305         while (!feof(file)) {
1306                 u64 start, size;
1307                 struct symbol *sym;
1308                 int line_len, len;
1309
1310                 line_len = getline(&line, &n, file);
1311                 if (line_len < 0)
1312                         break;
1313
1314                 if (!line)
1315                         goto out_failure;
1316
1317                 line[--line_len] = '\0'; /* \n */
1318
1319                 len = hex2u64(line, &start);
1320
1321                 len++;
1322                 if (len + 2 >= line_len)
1323                         continue;
1324
1325                 len += hex2u64(line + len, &size);
1326
1327                 len++;
1328                 if (len + 2 >= line_len)
1329                         continue;
1330
1331                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1332
1333                 if (sym == NULL)
1334                         goto out_delete_line;
1335
1336                 symbols__insert(&dso->symbols[map->type], sym);
1337                 nr_syms++;
1338         }
1339
1340         free(line);
1341         fclose(file);
1342
1343         return nr_syms;
1344
1345 out_delete_line:
1346         free(line);
1347 out_failure:
1348         return -1;
1349 }
1350
1351 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1352                                            enum dso_binary_type type)
1353 {
1354         switch (type) {
1355         case DSO_BINARY_TYPE__JAVA_JIT:
1356         case DSO_BINARY_TYPE__DEBUGLINK:
1357         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1358         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1359         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1360         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1361         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1362                 return !kmod && dso->kernel == DSO_TYPE_USER;
1363
1364         case DSO_BINARY_TYPE__KALLSYMS:
1365         case DSO_BINARY_TYPE__VMLINUX:
1366         case DSO_BINARY_TYPE__KCORE:
1367                 return dso->kernel == DSO_TYPE_KERNEL;
1368
1369         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1370         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1371         case DSO_BINARY_TYPE__GUEST_KCORE:
1372                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1373
1374         case DSO_BINARY_TYPE__GUEST_KMODULE:
1375         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1376         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1377         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1378                 /*
1379                  * kernel modules know their symtab type - it's set when
1380                  * creating a module dso in machine__findnew_module_map().
1381                  */
1382                 return kmod && dso->symtab_type == type;
1383
1384         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1385                 return true;
1386
1387         case DSO_BINARY_TYPE__NOT_FOUND:
1388         default:
1389                 return false;
1390         }
1391 }
1392
1393 int dso__load(struct dso *dso, struct map *map)
1394 {
1395         char *name;
1396         int ret = -1;
1397         u_int i;
1398         struct machine *machine;
1399         char *root_dir = (char *) "";
1400         int ss_pos = 0;
1401         struct symsrc ss_[2];
1402         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1403         bool kmod;
1404         unsigned char build_id[BUILD_ID_SIZE];
1405
1406         pthread_mutex_lock(&dso->lock);
1407
1408         /* check again under the dso->lock */
1409         if (dso__loaded(dso, map->type)) {
1410                 ret = 1;
1411                 goto out;
1412         }
1413
1414         if (dso->kernel) {
1415                 if (dso->kernel == DSO_TYPE_KERNEL)
1416                         ret = dso__load_kernel_sym(dso, map);
1417                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1418                         ret = dso__load_guest_kernel_sym(dso, map);
1419
1420                 goto out;
1421         }
1422
1423         if (map->groups && map->groups->machine)
1424                 machine = map->groups->machine;
1425         else
1426                 machine = NULL;
1427
1428         dso->adjust_symbols = 0;
1429
1430         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1431                 struct stat st;
1432
1433                 if (lstat(dso->name, &st) < 0)
1434                         goto out;
1435
1436                 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
1437                         pr_warning("File %s not owned by current user or root, "
1438                                    "ignoring it (use -f to override).\n", dso->name);
1439                         goto out;
1440                 }
1441
1442                 ret = dso__load_perf_map(dso, map);
1443                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1444                                              DSO_BINARY_TYPE__NOT_FOUND;
1445                 goto out;
1446         }
1447
1448         if (machine)
1449                 root_dir = machine->root_dir;
1450
1451         name = malloc(PATH_MAX);
1452         if (!name)
1453                 goto out;
1454
1455         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1456                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1457                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1458                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1459
1460
1461         /*
1462          * Read the build id if possible. This is required for
1463          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1464          */
1465         if (!dso->has_build_id &&
1466             is_regular_file(dso->long_name)) {
1467             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1468             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1469                 dso__set_build_id(dso, build_id);
1470         }
1471
1472         /*
1473          * Iterate over candidate debug images.
1474          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1475          * and/or opd section) for processing.
1476          */
1477         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1478                 struct symsrc *ss = &ss_[ss_pos];
1479                 bool next_slot = false;
1480
1481                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1482
1483                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1484                         continue;
1485
1486                 if (dso__read_binary_type_filename(dso, symtab_type,
1487                                                    root_dir, name, PATH_MAX))
1488                         continue;
1489
1490                 if (!is_regular_file(name))
1491                         continue;
1492
1493                 /* Name is now the name of the next image to try */
1494                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1495                         continue;
1496
1497                 if (!syms_ss && symsrc__has_symtab(ss)) {
1498                         syms_ss = ss;
1499                         next_slot = true;
1500                         if (!dso->symsrc_filename)
1501                                 dso->symsrc_filename = strdup(name);
1502                 }
1503
1504                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1505                         runtime_ss = ss;
1506                         next_slot = true;
1507                 }
1508
1509                 if (next_slot) {
1510                         ss_pos++;
1511
1512                         if (syms_ss && runtime_ss)
1513                                 break;
1514                 } else {
1515                         symsrc__destroy(ss);
1516                 }
1517
1518         }
1519
1520         if (!runtime_ss && !syms_ss)
1521                 goto out_free;
1522
1523         if (runtime_ss && !syms_ss) {
1524                 syms_ss = runtime_ss;
1525         }
1526
1527         /* We'll have to hope for the best */
1528         if (!runtime_ss && syms_ss)
1529                 runtime_ss = syms_ss;
1530
1531         if (syms_ss && syms_ss->type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
1532                 if (dso__build_id_is_kmod(dso, name, PATH_MAX))
1533                         kmod = true;
1534
1535         if (syms_ss)
1536                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1537         else
1538                 ret = -1;
1539
1540         if (ret > 0) {
1541                 int nr_plt;
1542
1543                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map);
1544                 if (nr_plt > 0)
1545                         ret += nr_plt;
1546         }
1547
1548         for (; ss_pos > 0; ss_pos--)
1549                 symsrc__destroy(&ss_[ss_pos - 1]);
1550 out_free:
1551         free(name);
1552         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1553                 ret = 0;
1554 out:
1555         dso__set_loaded(dso, map->type);
1556         pthread_mutex_unlock(&dso->lock);
1557
1558         return ret;
1559 }
1560
1561 struct map *map_groups__find_by_name(struct map_groups *mg,
1562                                      enum map_type type, const char *name)
1563 {
1564         struct maps *maps = &mg->maps[type];
1565         struct map *map;
1566
1567         pthread_rwlock_rdlock(&maps->lock);
1568
1569         for (map = maps__first(maps); map; map = map__next(map)) {
1570                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1571                         goto out_unlock;
1572         }
1573
1574         map = NULL;
1575
1576 out_unlock:
1577         pthread_rwlock_unlock(&maps->lock);
1578         return map;
1579 }
1580
1581 int dso__load_vmlinux(struct dso *dso, struct map *map,
1582                       const char *vmlinux, bool vmlinux_allocated)
1583 {
1584         int err = -1;
1585         struct symsrc ss;
1586         char symfs_vmlinux[PATH_MAX];
1587         enum dso_binary_type symtab_type;
1588
1589         if (vmlinux[0] == '/')
1590                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1591         else
1592                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1593
1594         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1595                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1596         else
1597                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1598
1599         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1600                 return -1;
1601
1602         err = dso__load_sym(dso, map, &ss, &ss, 0);
1603         symsrc__destroy(&ss);
1604
1605         if (err > 0) {
1606                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1607                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1608                 else
1609                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1610                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1611                 dso__set_loaded(dso, map->type);
1612                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1613         }
1614
1615         return err;
1616 }
1617
1618 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1619 {
1620         int i, err = 0;
1621         char *filename = NULL;
1622
1623         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1624                  vmlinux_path__nr_entries + 1);
1625
1626         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1627                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1628                 if (err > 0)
1629                         goto out;
1630         }
1631
1632         if (!symbol_conf.ignore_vmlinux_buildid)
1633                 filename = dso__build_id_filename(dso, NULL, 0);
1634         if (filename != NULL) {
1635                 err = dso__load_vmlinux(dso, map, filename, true);
1636                 if (err > 0)
1637                         goto out;
1638                 free(filename);
1639         }
1640 out:
1641         return err;
1642 }
1643
1644 static bool visible_dir_filter(const char *name, struct dirent *d)
1645 {
1646         if (d->d_type != DT_DIR)
1647                 return false;
1648         return lsdir_no_dot_filter(name, d);
1649 }
1650
1651 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1652 {
1653         char kallsyms_filename[PATH_MAX];
1654         int ret = -1;
1655         struct strlist *dirs;
1656         struct str_node *nd;
1657
1658         dirs = lsdir(dir, visible_dir_filter);
1659         if (!dirs)
1660                 return -1;
1661
1662         strlist__for_each_entry(nd, dirs) {
1663                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1664                           "%s/%s/kallsyms", dir, nd->s);
1665                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1666                         strlcpy(dir, kallsyms_filename, dir_sz);
1667                         ret = 0;
1668                         break;
1669                 }
1670         }
1671
1672         strlist__delete(dirs);
1673
1674         return ret;
1675 }
1676
1677 /*
1678  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1679  * since access(R_OK) only checks with real UID/GID but open() use effective
1680  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1681  */
1682 static bool filename__readable(const char *file)
1683 {
1684         int fd = open(file, O_RDONLY);
1685         if (fd < 0)
1686                 return false;
1687         close(fd);
1688         return true;
1689 }
1690
1691 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1692 {
1693         u8 host_build_id[BUILD_ID_SIZE];
1694         char sbuild_id[SBUILD_ID_SIZE];
1695         bool is_host = false;
1696         char path[PATH_MAX];
1697
1698         if (!dso->has_build_id) {
1699                 /*
1700                  * Last resort, if we don't have a build-id and couldn't find
1701                  * any vmlinux file, try the running kernel kallsyms table.
1702                  */
1703                 goto proc_kallsyms;
1704         }
1705
1706         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1707                                  sizeof(host_build_id)) == 0)
1708                 is_host = dso__build_id_equal(dso, host_build_id);
1709
1710         /* Try a fast path for /proc/kallsyms if possible */
1711         if (is_host) {
1712                 /*
1713                  * Do not check the build-id cache, unless we know we cannot use
1714                  * /proc/kcore or module maps don't match to /proc/kallsyms.
1715                  * To check readability of /proc/kcore, do not use access(R_OK)
1716                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1717                  * can't check it.
1718                  */
1719                 if (filename__readable("/proc/kcore") &&
1720                     !validate_kcore_addresses("/proc/kallsyms", map))
1721                         goto proc_kallsyms;
1722         }
1723
1724         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1725
1726         /* Find kallsyms in build-id cache with kcore */
1727         scnprintf(path, sizeof(path), "%s/%s/%s",
1728                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
1729
1730         if (!find_matching_kcore(map, path, sizeof(path)))
1731                 return strdup(path);
1732
1733         /* Use current /proc/kallsyms if possible */
1734         if (is_host) {
1735 proc_kallsyms:
1736                 return strdup("/proc/kallsyms");
1737         }
1738
1739         /* Finally, find a cache of kallsyms */
1740         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1741                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1742                        sbuild_id);
1743                 return NULL;
1744         }
1745
1746         return strdup(path);
1747 }
1748
1749 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1750 {
1751         int err;
1752         const char *kallsyms_filename = NULL;
1753         char *kallsyms_allocated_filename = NULL;
1754         /*
1755          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1756          * it and only it, reporting errors to the user if it cannot be used.
1757          *
1758          * For instance, try to analyse an ARM perf.data file _without_ a
1759          * build-id, or if the user specifies the wrong path to the right
1760          * vmlinux file, obviously we can't fallback to another vmlinux (a
1761          * x86_86 one, on the machine where analysis is being performed, say),
1762          * or worse, /proc/kallsyms.
1763          *
1764          * If the specified file _has_ a build-id and there is a build-id
1765          * section in the perf.data file, we will still do the expected
1766          * validation in dso__load_vmlinux and will bail out if they don't
1767          * match.
1768          */
1769         if (symbol_conf.kallsyms_name != NULL) {
1770                 kallsyms_filename = symbol_conf.kallsyms_name;
1771                 goto do_kallsyms;
1772         }
1773
1774         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1775                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
1776         }
1777
1778         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1779                 err = dso__load_vmlinux_path(dso, map);
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);
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, DSO__NAME_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 {
1812         int err;
1813         const char *kallsyms_filename = NULL;
1814         struct machine *machine;
1815         char path[PATH_MAX];
1816
1817         if (!map->groups) {
1818                 pr_debug("Guest kernel map hasn't the point to groups\n");
1819                 return -1;
1820         }
1821         machine = map->groups->machine;
1822
1823         if (machine__is_default_guest(machine)) {
1824                 /*
1825                  * if the user specified a vmlinux filename, use it and only
1826                  * it, reporting errors to the user if it cannot be used.
1827                  * Or use file guest_kallsyms inputted by user on commandline
1828                  */
1829                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1830                         err = dso__load_vmlinux(dso, map,
1831                                                 symbol_conf.default_guest_vmlinux_name,
1832                                                 false);
1833                         return err;
1834                 }
1835
1836                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1837                 if (!kallsyms_filename)
1838                         return -1;
1839         } else {
1840                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1841                 kallsyms_filename = path;
1842         }
1843
1844         err = dso__load_kallsyms(dso, kallsyms_filename, map);
1845         if (err > 0)
1846                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1847         if (err > 0 && !dso__is_kcore(dso)) {
1848                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1849                 machine__mmap_name(machine, path, sizeof(path));
1850                 dso__set_long_name(dso, strdup(path), true);
1851                 map__fixup_start(map);
1852                 map__fixup_end(map);
1853         }
1854
1855         return err;
1856 }
1857
1858 static void vmlinux_path__exit(void)
1859 {
1860         while (--vmlinux_path__nr_entries >= 0)
1861                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1862         vmlinux_path__nr_entries = 0;
1863
1864         zfree(&vmlinux_path);
1865 }
1866
1867 static const char * const vmlinux_paths[] = {
1868         "vmlinux",
1869         "/boot/vmlinux"
1870 };
1871
1872 static const char * const vmlinux_paths_upd[] = {
1873         "/boot/vmlinux-%s",
1874         "/usr/lib/debug/boot/vmlinux-%s",
1875         "/lib/modules/%s/build/vmlinux",
1876         "/usr/lib/debug/lib/modules/%s/vmlinux",
1877         "/usr/lib/debug/boot/vmlinux-%s.debug"
1878 };
1879
1880 static int vmlinux_path__add(const char *new_entry)
1881 {
1882         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
1883         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1884                 return -1;
1885         ++vmlinux_path__nr_entries;
1886
1887         return 0;
1888 }
1889
1890 static int vmlinux_path__init(struct perf_env *env)
1891 {
1892         struct utsname uts;
1893         char bf[PATH_MAX];
1894         char *kernel_version;
1895         unsigned int i;
1896
1897         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
1898                               ARRAY_SIZE(vmlinux_paths_upd)));
1899         if (vmlinux_path == NULL)
1900                 return -1;
1901
1902         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
1903                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
1904                         goto out_fail;
1905
1906         /* only try kernel version if no symfs was given */
1907         if (symbol_conf.symfs[0] != 0)
1908                 return 0;
1909
1910         if (env) {
1911                 kernel_version = env->os_release;
1912         } else {
1913                 if (uname(&uts) < 0)
1914                         goto out_fail;
1915
1916                 kernel_version = uts.release;
1917         }
1918
1919         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
1920                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
1921                 if (vmlinux_path__add(bf) < 0)
1922                         goto out_fail;
1923         }
1924
1925         return 0;
1926
1927 out_fail:
1928         vmlinux_path__exit();
1929         return -1;
1930 }
1931
1932 int setup_list(struct strlist **list, const char *list_str,
1933                       const char *list_name)
1934 {
1935         if (list_str == NULL)
1936                 return 0;
1937
1938         *list = strlist__new(list_str, NULL);
1939         if (!*list) {
1940                 pr_err("problems parsing %s list\n", list_name);
1941                 return -1;
1942         }
1943
1944         symbol_conf.has_filter = true;
1945         return 0;
1946 }
1947
1948 int setup_intlist(struct intlist **list, const char *list_str,
1949                   const char *list_name)
1950 {
1951         if (list_str == NULL)
1952                 return 0;
1953
1954         *list = intlist__new(list_str);
1955         if (!*list) {
1956                 pr_err("problems parsing %s list\n", list_name);
1957                 return -1;
1958         }
1959         return 0;
1960 }
1961
1962 static bool symbol__read_kptr_restrict(void)
1963 {
1964         bool value = false;
1965         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1966
1967         if (fp != NULL) {
1968                 char line[8];
1969
1970                 if (fgets(line, sizeof(line), fp) != NULL)
1971                         value = ((geteuid() != 0) || (getuid() != 0)) ?
1972                                         (atoi(line) != 0) :
1973                                         (atoi(line) == 2);
1974
1975                 fclose(fp);
1976         }
1977
1978         return value;
1979 }
1980
1981 int symbol__annotation_init(void)
1982 {
1983         if (symbol_conf.initialized) {
1984                 pr_err("Annotation needs to be init before symbol__init()\n");
1985                 return -1;
1986         }
1987
1988         if (symbol_conf.init_annotation) {
1989                 pr_warning("Annotation being initialized multiple times\n");
1990                 return 0;
1991         }
1992
1993         symbol_conf.priv_size += sizeof(struct annotation);
1994         symbol_conf.init_annotation = true;
1995         return 0;
1996 }
1997
1998 int symbol__init(struct perf_env *env)
1999 {
2000         const char *symfs;
2001
2002         if (symbol_conf.initialized)
2003                 return 0;
2004
2005         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2006
2007         symbol__elf_init();
2008
2009         if (symbol_conf.sort_by_name)
2010                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2011                                           sizeof(struct symbol));
2012
2013         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2014                 return -1;
2015
2016         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2017                 pr_err("'.' is the only non valid --field-separator argument\n");
2018                 return -1;
2019         }
2020
2021         if (setup_list(&symbol_conf.dso_list,
2022                        symbol_conf.dso_list_str, "dso") < 0)
2023                 return -1;
2024
2025         if (setup_list(&symbol_conf.comm_list,
2026                        symbol_conf.comm_list_str, "comm") < 0)
2027                 goto out_free_dso_list;
2028
2029         if (setup_intlist(&symbol_conf.pid_list,
2030                        symbol_conf.pid_list_str, "pid") < 0)
2031                 goto out_free_comm_list;
2032
2033         if (setup_intlist(&symbol_conf.tid_list,
2034                        symbol_conf.tid_list_str, "tid") < 0)
2035                 goto out_free_pid_list;
2036
2037         if (setup_list(&symbol_conf.sym_list,
2038                        symbol_conf.sym_list_str, "symbol") < 0)
2039                 goto out_free_tid_list;
2040
2041         if (setup_list(&symbol_conf.bt_stop_list,
2042                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2043                 goto out_free_sym_list;
2044
2045         /*
2046          * A path to symbols of "/" is identical to ""
2047          * reset here for simplicity.
2048          */
2049         symfs = realpath(symbol_conf.symfs, NULL);
2050         if (symfs == NULL)
2051                 symfs = symbol_conf.symfs;
2052         if (strcmp(symfs, "/") == 0)
2053                 symbol_conf.symfs = "";
2054         if (symfs != symbol_conf.symfs)
2055                 free((void *)symfs);
2056
2057         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2058
2059         symbol_conf.initialized = true;
2060         return 0;
2061
2062 out_free_sym_list:
2063         strlist__delete(symbol_conf.sym_list);
2064 out_free_tid_list:
2065         intlist__delete(symbol_conf.tid_list);
2066 out_free_pid_list:
2067         intlist__delete(symbol_conf.pid_list);
2068 out_free_comm_list:
2069         strlist__delete(symbol_conf.comm_list);
2070 out_free_dso_list:
2071         strlist__delete(symbol_conf.dso_list);
2072         return -1;
2073 }
2074
2075 void symbol__exit(void)
2076 {
2077         if (!symbol_conf.initialized)
2078                 return;
2079         strlist__delete(symbol_conf.bt_stop_list);
2080         strlist__delete(symbol_conf.sym_list);
2081         strlist__delete(symbol_conf.dso_list);
2082         strlist__delete(symbol_conf.comm_list);
2083         intlist__delete(symbol_conf.tid_list);
2084         intlist__delete(symbol_conf.pid_list);
2085         vmlinux_path__exit();
2086         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2087         symbol_conf.bt_stop_list = NULL;
2088         symbol_conf.initialized = false;
2089 }
2090
2091 int symbol__config_symfs(const struct option *opt __maybe_unused,
2092                          const char *dir, int unset __maybe_unused)
2093 {
2094         char *bf = NULL;
2095         int ret;
2096
2097         symbol_conf.symfs = strdup(dir);
2098         if (symbol_conf.symfs == NULL)
2099                 return -ENOMEM;
2100
2101         /* skip the locally configured cache if a symfs is given, and
2102          * config buildid dir to symfs/.debug
2103          */
2104         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2105         if (ret < 0)
2106                 return -ENOMEM;
2107
2108         set_buildid_dir(bf);
2109
2110         free(bf);
2111         return 0;
2112 }