tools/perf/util/symbol.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <dirent.h>
   3 #include <errno.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <linux/capability.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mman.h>
  10 #include <linux/string.h>
  11 #include <linux/time64.h>
  12 #include <sys/types.h>
  13 #include <sys/stat.h>
  14 #include <sys/param.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <inttypes.h>
  18 #include "annotate.h"
  19 #include "build-id.h"
  20 #include "cap.h"
  21 #include "dso.h"
  22 #include "util.h" // lsdir()
  23 #include "debug.h"
  24 #include "event.h"
  25 #include "machine.h"
  26 #include "map.h"
  27 #include "symbol.h"
  28 #include "map_symbol.h"
  29 #include "mem-events.h"
  30 #include "symsrc.h"
  31 #include "strlist.h"
  32 #include "intlist.h"
  33 #include "namespaces.h"
  34 #include "header.h"
  35 #include "path.h"
  36 #include <linux/ctype.h>
  37 #include <linux/zalloc.h>
  38
  39 #include <elf.h>
  40 #include <limits.h>
  41 #include <symbol/kallsyms.h>
  42 #include <sys/utsname.h>
  43
  44 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
  45 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
  46 static bool symbol__is_idle(const char *name);
  47
  48 int vmlinux_path__nr_entries;
  49 char **vmlinux_path;
  50
  51 struct symbol_conf symbol_conf = {
  52         .nanosecs               = false,
  53         .use_modules            = true,
  54         .try_vmlinux_path       = true,
  55         .demangle               = true,
  56         .demangle_kernel        = false,
  57         .cumulate_callchain     = true,
  58         .time_quantum           = 100 * NSEC_PER_MSEC, /* 100ms */
  59         .show_hist_headers      = true,
  60         .symfs                  = "",
  61         .event_group            = true,
  62         .inline_name            = true,
  63         .res_sample             = 0,
  64 };
  65
  66 static enum dso_binary_type binary_type_symtab[] = {
  67         DSO_BINARY_TYPE__KALLSYMS,
  68         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  69         DSO_BINARY_TYPE__JAVA_JIT,
  70         DSO_BINARY_TYPE__DEBUGLINK,
  71         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  72         DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
  73         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  74         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  75         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  76         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  77         DSO_BINARY_TYPE__GUEST_KMODULE,
  78         DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  79         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  80         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  81         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  82         DSO_BINARY_TYPE__NOT_FOUND,
  83 };
  84
  85 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  86
  87 static bool symbol_type__filter(char symbol_type)
  88 {
  89         symbol_type = toupper(symbol_type);
  90         return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
  91 }
  92
  93 static int prefix_underscores_count(const char *str)
  94 {
  95         const char *tail = str;
  96
  97         while (*tail == '_')
  98                 tail++;
  99
 100         return tail - str;
 101 }
 102
 103 void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
 104 {
 105         p->end = c->start;
 106 }
 107
 108 const char * __weak arch__normalize_symbol_name(const char *name)
 109 {
 110         return name;
 111 }
 112
 113 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
 114 {
 115         return strcmp(namea, nameb);
 116 }
 117
 118 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
 119                                         unsigned int n)
 120 {
 121         return strncmp(namea, nameb, n);
 122 }
 123
 124 int __weak arch__choose_best_symbol(struct symbol *syma,
 125                                     struct symbol *symb __maybe_unused)
 126 {
 127         /* Avoid "SyS" kernel syscall aliases */
 128         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
 129                 return SYMBOL_B;
 130         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 131                 return SYMBOL_B;
 132
 133         return SYMBOL_A;
 134 }
 135
 136 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 137 {
 138         s64 a;
 139         s64 b;
 140         size_t na, nb;
 141
 142         /* Prefer a symbol with non zero length */
 143         a = syma->end - syma->start;
 144         b = symb->end - symb->start;
 145         if ((b == 0) && (a > 0))
 146                 return SYMBOL_A;
 147         else if ((a == 0) && (b > 0))
 148                 return SYMBOL_B;
 149
 150         /* Prefer a non weak symbol over a weak one */
 151         a = syma->binding == STB_WEAK;
 152         b = symb->binding == STB_WEAK;
 153         if (b && !a)
 154                 return SYMBOL_A;
 155         if (a && !b)
 156                 return SYMBOL_B;
 157
 158         /* Prefer a global symbol over a non global one */
 159         a = syma->binding == STB_GLOBAL;
 160         b = symb->binding == STB_GLOBAL;
 161         if (a && !b)
 162                 return SYMBOL_A;
 163         if (b && !a)
 164                 return SYMBOL_B;
 165
 166         /* Prefer a symbol with less underscores */
 167         a = prefix_underscores_count(syma->name);
 168         b = prefix_underscores_count(symb->name);
 169         if (b > a)
 170                 return SYMBOL_A;
 171         else if (a > b)
 172                 return SYMBOL_B;
 173
 174         /* Choose the symbol with the longest name */
 175         na = strlen(syma->name);
 176         nb = strlen(symb->name);
 177         if (na > nb)
 178                 return SYMBOL_A;
 179         else if (na < nb)
 180                 return SYMBOL_B;
 181
 182         return arch__choose_best_symbol(syma, symb);
 183 }
 184
 185 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
 186 {
 187         struct rb_node *nd;
 188         struct symbol *curr, *next;
 189
 190         if (symbol_conf.allow_aliases)
 191                 return;
 192
 193         nd = rb_first_cached(symbols);
 194
 195         while (nd) {
 196                 curr = rb_entry(nd, struct symbol, rb_node);
 197 again:
 198                 nd = rb_next(&curr->rb_node);
 199                 next = rb_entry(nd, struct symbol, rb_node);
 200
 201                 if (!nd)
 202                         break;
 203
 204                 if (curr->start != next->start)
 205                         continue;
 206
 207                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 208                         rb_erase_cached(&next->rb_node, symbols);
 209                         symbol__delete(next);
 210                         goto again;
 211                 } else {
 212                         nd = rb_next(&curr->rb_node);
 213                         rb_erase_cached(&curr->rb_node, symbols);
 214                         symbol__delete(curr);
 215                 }
 216         }
 217 }
 218
 219 void symbols__fixup_end(struct rb_root_cached *symbols)
 220 {
 221         struct rb_node *nd, *prevnd = rb_first_cached(symbols);
 222         struct symbol *curr, *prev;
 223
 224         if (prevnd == NULL)
 225                 return;
 226
 227         curr = rb_entry(prevnd, struct symbol, rb_node);
 228
 229         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 230                 prev = curr;
 231                 curr = rb_entry(nd, struct symbol, rb_node);
 232
 233                 if (prev->end == prev->start && prev->end != curr->start)
 234                         arch__symbols__fixup_end(prev, curr);
 235         }
 236
 237         /* Last entry */
 238         if (curr->end == curr->start)
 239                 curr->end = roundup(curr->start, 4096) + 4096;
 240 }
 241
 242 void map_groups__fixup_end(struct map_groups *mg)
 243 {
 244         struct maps *maps = &mg->maps;
 245         struct map *next, *curr;
 246
 247         down_write(&maps->lock);
 248
 249         curr = maps__first(maps);
 250         if (curr == NULL)
 251                 goto out_unlock;
 252
 253         for (next = map__next(curr); next; next = map__next(curr)) {
 254                 if (!curr->end)
 255                         curr->end = next->start;
 256                 curr = next;
 257         }
 258
 259         /*
 260          * We still haven't the actual symbols, so guess the
 261          * last map final address.
 262          */
 263         if (!curr->end)
 264                 curr->end = ~0ULL;
 265
 266 out_unlock:
 267         up_write(&maps->lock);
 268 }
 269
 270 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
 271 {
 272         size_t namelen = strlen(name) + 1;
 273         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 274                                         sizeof(*sym) + namelen));
 275         if (sym == NULL)
 276                 return NULL;
 277
 278         if (symbol_conf.priv_size) {
 279                 if (symbol_conf.init_annotation) {
 280                         struct annotation *notes = (void *)sym;
 281                         pthread_mutex_init(&notes->lock, NULL);
 282                 }
 283                 sym = ((void *)sym) + symbol_conf.priv_size;
 284         }
 285
 286         sym->start   = start;
 287         sym->end     = len ? start + len : start;
 288         sym->type    = type;
 289         sym->binding = binding;
 290         sym->namelen = namelen - 1;
 291
 292         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 293                   __func__, name, start, sym->end);
 294         memcpy(sym->name, name, namelen);
 295
 296         return sym;
 297 }
 298
 299 void symbol__delete(struct symbol *sym)
 300 {
 301         free(((void *)sym) - symbol_conf.priv_size);
 302 }
 303
 304 void symbols__delete(struct rb_root_cached *symbols)
 305 {
 306         struct symbol *pos;
 307         struct rb_node *next = rb_first_cached(symbols);
 308
 309         while (next) {
 310                 pos = rb_entry(next, struct symbol, rb_node);
 311                 next = rb_next(&pos->rb_node);
 312                 rb_erase_cached(&pos->rb_node, symbols);
 313                 symbol__delete(pos);
 314         }
 315 }
 316
 317 void __symbols__insert(struct rb_root_cached *symbols,
 318                        struct symbol *sym, bool kernel)
 319 {
 320         struct rb_node **p = &symbols->rb_root.rb_node;
 321         struct rb_node *parent = NULL;
 322         const u64 ip = sym->start;
 323         struct symbol *s;
 324         bool leftmost = true;
 325
 326         if (kernel) {
 327                 const char *name = sym->name;
 328                 /*
 329                  * ppc64 uses function descriptors and appends a '.' to the
 330                  * start of every instruction address. Remove it.
 331                  */
 332                 if (name[0] == '.')
 333                         name++;
 334                 sym->idle = symbol__is_idle(name);
 335         }
 336
 337         while (*p != NULL) {
 338                 parent = *p;
 339                 s = rb_entry(parent, struct symbol, rb_node);
 340                 if (ip < s->start)
 341                         p = &(*p)->rb_left;
 342                 else {
 343                         p = &(*p)->rb_right;
 344                         leftmost = false;
 345                 }
 346         }
 347         rb_link_node(&sym->rb_node, parent, p);
 348         rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
 349 }
 350
 351 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
 352 {
 353         __symbols__insert(symbols, sym, false);
 354 }
 355
 356 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
 357 {
 358         struct rb_node *n;
 359
 360         if (symbols == NULL)
 361                 return NULL;
 362
 363         n = symbols->rb_root.rb_node;
 364
 365         while (n) {
 366                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 367
 368                 if (ip < s->start)
 369                         n = n->rb_left;
 370                 else if (ip > s->end || (ip == s->end && ip != s->start))
 371                         n = n->rb_right;
 372                 else
 373                         return s;
 374         }
 375
 376         return NULL;
 377 }
 378
 379 static struct symbol *symbols__first(struct rb_root_cached *symbols)
 380 {
 381         struct rb_node *n = rb_first_cached(symbols);
 382
 383         if (n)
 384                 return rb_entry(n, struct symbol, rb_node);
 385
 386         return NULL;
 387 }
 388
 389 static struct symbol *symbols__last(struct rb_root_cached *symbols)
 390 {
 391         struct rb_node *n = rb_last(&symbols->rb_root);
 392
 393         if (n)
 394                 return rb_entry(n, struct symbol, rb_node);
 395
 396         return NULL;
 397 }
 398
 399 static struct symbol *symbols__next(struct symbol *sym)
 400 {
 401         struct rb_node *n = rb_next(&sym->rb_node);
 402
 403         if (n)
 404                 return rb_entry(n, struct symbol, rb_node);
 405
 406         return NULL;
 407 }
 408
 409 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
 410 {
 411         struct rb_node **p = &symbols->rb_root.rb_node;
 412         struct rb_node *parent = NULL;
 413         struct symbol_name_rb_node *symn, *s;
 414         bool leftmost = true;
 415
 416         symn = container_of(sym, struct symbol_name_rb_node, sym);
 417
 418         while (*p != NULL) {
 419                 parent = *p;
 420                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 421                 if (strcmp(sym->name, s->sym.name) < 0)
 422                         p = &(*p)->rb_left;
 423                 else {
 424                         p = &(*p)->rb_right;
 425                         leftmost = false;
 426                 }
 427         }
 428         rb_link_node(&symn->rb_node, parent, p);
 429         rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
 430 }
 431
 432 static void symbols__sort_by_name(struct rb_root_cached *symbols,
 433                                   struct rb_root_cached *source)
 434 {
 435         struct rb_node *nd;
 436
 437         for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
 438                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 439                 symbols__insert_by_name(symbols, pos);
 440         }
 441 }
 442
 443 int symbol__match_symbol_name(const char *name, const char *str,
 444                               enum symbol_tag_include includes)
 445 {
 446         const char *versioning;
 447
 448         if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
 449             (versioning = strstr(name, "@@"))) {
 450                 int len = strlen(str);
 451
 452                 if (len < versioning - name)
 453                         len = versioning - name;
 454
 455                 return arch__compare_symbol_names_n(name, str, len);
 456         } else
 457                 return arch__compare_symbol_names(name, str);
 458 }
 459
 460 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
 461                                             const char *name,
 462                                             enum symbol_tag_include includes)
 463 {
 464         struct rb_node *n;
 465         struct symbol_name_rb_node *s = NULL;
 466
 467         if (symbols == NULL)
 468                 return NULL;
 469
 470         n = symbols->rb_root.rb_node;
 471
 472         while (n) {
 473                 int cmp;
 474
 475                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 476                 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
 477
 478                 if (cmp > 0)
 479                         n = n->rb_left;
 480                 else if (cmp < 0)
 481                         n = n->rb_right;
 482                 else
 483                         break;
 484         }
 485
 486         if (n == NULL)
 487                 return NULL;
 488
 489         if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
 490                 /* return first symbol that has same name (if any) */
 491                 for (n = rb_prev(n); n; n = rb_prev(n)) {
 492                         struct symbol_name_rb_node *tmp;
 493
 494                         tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 495                         if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
 496                                 break;
 497
 498                         s = tmp;
 499                 }
 500
 501         return &s->sym;
 502 }
 503
 504 void dso__reset_find_symbol_cache(struct dso *dso)
 505 {
 506         dso->last_find_result.addr   = 0;
 507         dso->last_find_result.symbol = NULL;
 508 }
 509
 510 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
 511 {
 512         __symbols__insert(&dso->symbols, sym, dso->kernel);
 513
 514         /* update the symbol cache if necessary */
 515         if (dso->last_find_result.addr >= sym->start &&
 516             (dso->last_find_result.addr < sym->end ||
 517             sym->start == sym->end)) {
 518                 dso->last_find_result.symbol = sym;
 519         }
 520 }
 521
 522 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
 523 {
 524         if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
 525                 dso->last_find_result.addr   = addr;
 526                 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
 527         }
 528
 529         return dso->last_find_result.symbol;
 530 }
 531
 532 struct symbol *dso__first_symbol(struct dso *dso)
 533 {
 534         return symbols__first(&dso->symbols);
 535 }
 536
 537 struct symbol *dso__last_symbol(struct dso *dso)
 538 {
 539         return symbols__last(&dso->symbols);
 540 }
 541
 542 struct symbol *dso__next_symbol(struct symbol *sym)
 543 {
 544         return symbols__next(sym);
 545 }
 546
 547 struct symbol *symbol__next_by_name(struct symbol *sym)
 548 {
 549         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 550         struct rb_node *n = rb_next(&s->rb_node);
 551
 552         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 553 }
 554
 555  /*
 556   * Returns first symbol that matched with @name.
 557   */
 558 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
 559 {
 560         struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
 561                                                  SYMBOL_TAG_INCLUDE__NONE);
 562         if (!s)
 563                 s = symbols__find_by_name(&dso->symbol_names, name,
 564                                           SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
 565         return s;
 566 }
 567
 568 void dso__sort_by_name(struct dso *dso)
 569 {
 570         dso__set_sorted_by_name(dso);
 571         return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
 572 }
 573
 574 int modules__parse(const char *filename, void *arg,
 575                    int (*process_module)(void *arg, const char *name,
 576                                          u64 start, u64 size))
 577 {
 578         char *line = NULL;
 579         size_t n;
 580         FILE *file;
 581         int err = 0;
 582
 583         file = fopen(filename, "r");
 584         if (file == NULL)
 585                 return -1;
 586
 587         while (1) {
 588                 char name[PATH_MAX];
 589                 u64 start, size;
 590                 char *sep, *endptr;
 591                 ssize_t line_len;
 592
 593                 line_len = getline(&line, &n, file);
 594                 if (line_len < 0) {
 595                         if (feof(file))
 596                                 break;
 597                         err = -1;
 598                         goto out;
 599                 }
 600
 601                 if (!line) {
 602                         err = -1;
 603                         goto out;
 604                 }
 605
 606                 line[--line_len] = '\0'; /* \n */
 607
 608                 sep = strrchr(line, 'x');
 609                 if (sep == NULL)
 610                         continue;
 611
 612                 hex2u64(sep + 1, &start);
 613
 614                 sep = strchr(line, ' ');
 615                 if (sep == NULL)
 616                         continue;
 617
 618                 *sep = '\0';
 619
 620                 scnprintf(name, sizeof(name), "[%s]", line);
 621
 622                 size = strtoul(sep + 1, &endptr, 0);
 623                 if (*endptr != ' ' && *endptr != '\t')
 624                         continue;
 625
 626                 err = process_module(arg, name, start, size);
 627                 if (err)
 628                         break;
 629         }
 630 out:
 631         free(line);
 632         fclose(file);
 633         return err;
 634 }
 635
 636 /*
 637  * These are symbols in the kernel image, so make sure that
 638  * sym is from a kernel DSO.
 639  */
 640 static bool symbol__is_idle(const char *name)
 641 {
 642         const char * const idle_symbols[] = {
 643                 "arch_cpu_idle",
 644                 "cpu_idle",
 645                 "cpu_startup_entry",
 646                 "intel_idle",
 647                 "default_idle",
 648                 "native_safe_halt",
 649                 "enter_idle",
 650                 "exit_idle",
 651                 "mwait_idle",
 652                 "mwait_idle_with_hints",
 653                 "poll_idle",
 654                 "ppc64_runlatch_off",
 655                 "pseries_dedicated_idle_sleep",
 656                 NULL
 657         };
 658         int i;
 659
 660         for (i = 0; idle_symbols[i]; i++) {
 661                 if (!strcmp(idle_symbols[i], name))
 662                         return true;
 663         }
 664
 665         return false;
 666 }
 667
 668 static int map__process_kallsym_symbol(void *arg, const char *name,
 669                                        char type, u64 start)
 670 {
 671         struct symbol *sym;
 672         struct dso *dso = arg;
 673         struct rb_root_cached *root = &dso->symbols;
 674
 675         if (!symbol_type__filter(type))
 676                 return 0;
 677
 678         /*
 679          * module symbols are not sorted so we add all
 680          * symbols, setting length to 0, and rely on
 681          * symbols__fixup_end() to fix it up.
 682          */
 683         sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 684         if (sym == NULL)
 685                 return -ENOMEM;
 686         /*
 687          * We will pass the symbols to the filter later, in
 688          * map__split_kallsyms, when we have split the maps per module
 689          */
 690         __symbols__insert(root, sym, !strchr(name, '['));
 691
 692         return 0;
 693 }
 694
 695 /*
 696  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 697  * so that we can in the next step set the symbol ->end address and then
 698  * call kernel_maps__split_kallsyms.
 699  */
 700 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 701 {
 702         return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 703 }
 704
 705 static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
 706 {
 707         struct map *curr_map;
 708         struct symbol *pos;
 709         int count = 0;
 710         struct rb_root_cached old_root = dso->symbols;
 711         struct rb_root_cached *root = &dso->symbols;
 712         struct rb_node *next = rb_first_cached(root);
 713
 714         if (!kmaps)
 715                 return -1;
 716
 717         *root = RB_ROOT_CACHED;
 718
 719         while (next) {
 720                 char *module;
 721
 722                 pos = rb_entry(next, struct symbol, rb_node);
 723                 next = rb_next(&pos->rb_node);
 724
 725                 rb_erase_cached(&pos->rb_node, &old_root);
 726                 RB_CLEAR_NODE(&pos->rb_node);
 727                 module = strchr(pos->name, '\t');
 728                 if (module)
 729                         *module = '\0';
 730
 731                 curr_map = map_groups__find(kmaps, pos->start);
 732
 733                 if (!curr_map) {
 734                         symbol__delete(pos);
 735                         continue;
 736                 }
 737
 738                 pos->start -= curr_map->start - curr_map->pgoff;
 739                 if (pos->end > curr_map->end)
 740                         pos->end = curr_map->end;
 741                 if (pos->end)
 742                         pos->end -= curr_map->start - curr_map->pgoff;
 743                 symbols__insert(&curr_map->dso->symbols, pos);
 744                 ++count;
 745         }
 746
 747         /* Symbols have been adjusted */
 748         dso->adjust_symbols = 1;
 749
 750         return count;
 751 }
 752
 753 /*
 754  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 755  * kernel range is broken in several maps, named [kernel].N, as we don't have
 756  * the original ELF section names vmlinux have.
 757  */
 758 static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
 759                                       struct map *initial_map)
 760 {
 761         struct machine *machine;
 762         struct map *curr_map = initial_map;
 763         struct symbol *pos;
 764         int count = 0, moved = 0;
 765         struct rb_root_cached *root = &dso->symbols;
 766         struct rb_node *next = rb_first_cached(root);
 767         int kernel_range = 0;
 768         bool x86_64;
 769
 770         if (!kmaps)
 771                 return -1;
 772
 773         machine = kmaps->machine;
 774
 775         x86_64 = machine__is(machine, "x86_64");
 776
 777         while (next) {
 778                 char *module;
 779
 780                 pos = rb_entry(next, struct symbol, rb_node);
 781                 next = rb_next(&pos->rb_node);
 782
 783                 module = strchr(pos->name, '\t');
 784                 if (module) {
 785                         if (!symbol_conf.use_modules)
 786                                 goto discard_symbol;
 787
 788                         *module++ = '\0';
 789
 790                         if (strcmp(curr_map->dso->short_name, module)) {
 791                                 if (curr_map != initial_map &&
 792                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 793                                     machine__is_default_guest(machine)) {
 794                                         /*
 795                                          * We assume all symbols of a module are
 796                                          * continuous in * kallsyms, so curr_map
 797                                          * points to a module and all its
 798                                          * symbols are in its kmap. Mark it as
 799                                          * loaded.
 800                                          */
 801                                         dso__set_loaded(curr_map->dso);
 802                                 }
 803
 804                                 curr_map = map_groups__find_by_name(kmaps, module);
 805                                 if (curr_map == NULL) {
 806                                         pr_debug("%s/proc/{kallsyms,modules} "
 807                                                  "inconsistency while looking "
 808                                                  "for \"%s\" module!\n",
 809                                                  machine->root_dir, module);
 810                                         curr_map = initial_map;
 811                                         goto discard_symbol;
 812                                 }
 813
 814                                 if (curr_map->dso->loaded &&
 815                                     !machine__is_default_guest(machine))
 816                                         goto discard_symbol;
 817                         }
 818                         /*
 819                          * So that we look just like we get from .ko files,
 820                          * i.e. not prelinked, relative to initial_map->start.
 821                          */
 822                         pos->start = curr_map->map_ip(curr_map, pos->start);
 823                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 824                 } else if (x86_64 && is_entry_trampoline(pos->name)) {
 825                         /*
 826                          * These symbols are not needed anymore since the
 827                          * trampoline maps refer to the text section and it's
 828                          * symbols instead. Avoid having to deal with
 829                          * relocations, and the assumption that the first symbol
 830                          * is the start of kernel text, by simply removing the
 831                          * symbols at this point.
 832                          */
 833                         goto discard_symbol;
 834                 } else if (curr_map != initial_map) {
 835                         char dso_name[PATH_MAX];
 836                         struct dso *ndso;
 837
 838                         if (delta) {
 839                                 /* Kernel was relocated at boot time */
 840                                 pos->start -= delta;
 841                                 pos->end -= delta;
 842                         }
 843
 844                         if (count == 0) {
 845                                 curr_map = initial_map;
 846                                 goto add_symbol;
 847                         }
 848
 849                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 850                                 snprintf(dso_name, sizeof(dso_name),
 851                                         "[guest.kernel].%d",
 852                                         kernel_range++);
 853                         else
 854                                 snprintf(dso_name, sizeof(dso_name),
 855                                         "[kernel].%d",
 856                                         kernel_range++);
 857
 858                         ndso = dso__new(dso_name);
 859                         if (ndso == NULL)
 860                                 return -1;
 861
 862                         ndso->kernel = dso->kernel;
 863
 864                         curr_map = map__new2(pos->start, ndso);
 865                         if (curr_map == NULL) {
 866                                 dso__put(ndso);
 867                                 return -1;
 868                         }
 869
 870                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 871                         map_groups__insert(kmaps, curr_map);
 872                         ++kernel_range;
 873                 } else if (delta) {
 874                         /* Kernel was relocated at boot time */
 875                         pos->start -= delta;
 876                         pos->end -= delta;
 877                 }
 878 add_symbol:
 879                 if (curr_map != initial_map) {
 880                         rb_erase_cached(&pos->rb_node, root);
 881                         symbols__insert(&curr_map->dso->symbols, pos);
 882                         ++moved;
 883                 } else
 884                         ++count;
 885
 886                 continue;
 887 discard_symbol:
 888                 rb_erase_cached(&pos->rb_node, root);
 889                 symbol__delete(pos);
 890         }
 891
 892         if (curr_map != initial_map &&
 893             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 894             machine__is_default_guest(kmaps->machine)) {
 895                 dso__set_loaded(curr_map->dso);
 896         }
 897
 898         return count + moved;
 899 }
 900
 901 bool symbol__restricted_filename(const char *filename,
 902                                  const char *restricted_filename)
 903 {
 904         bool restricted = false;
 905
 906         if (symbol_conf.kptr_restrict) {
 907                 char *r = realpath(filename, NULL);
 908
 909                 if (r != NULL) {
 910                         restricted = strcmp(r, restricted_filename) == 0;
 911                         free(r);
 912                         return restricted;
 913                 }
 914         }
 915
 916         return restricted;
 917 }
 918
 919 struct module_info {
 920         struct rb_node rb_node;
 921         char *name;
 922         u64 start;
 923 };
 924
 925 static void add_module(struct module_info *mi, struct rb_root *modules)
 926 {
 927         struct rb_node **p = &modules->rb_node;
 928         struct rb_node *parent = NULL;
 929         struct module_info *m;
 930
 931         while (*p != NULL) {
 932                 parent = *p;
 933                 m = rb_entry(parent, struct module_info, rb_node);
 934                 if (strcmp(mi->name, m->name) < 0)
 935                         p = &(*p)->rb_left;
 936                 else
 937                         p = &(*p)->rb_right;
 938         }
 939         rb_link_node(&mi->rb_node, parent, p);
 940         rb_insert_color(&mi->rb_node, modules);
 941 }
 942
 943 static void delete_modules(struct rb_root *modules)
 944 {
 945         struct module_info *mi;
 946         struct rb_node *next = rb_first(modules);
 947
 948         while (next) {
 949                 mi = rb_entry(next, struct module_info, rb_node);
 950                 next = rb_next(&mi->rb_node);
 951                 rb_erase(&mi->rb_node, modules);
 952                 zfree(&mi->name);
 953                 free(mi);
 954         }
 955 }
 956
 957 static struct module_info *find_module(const char *name,
 958                                        struct rb_root *modules)
 959 {
 960         struct rb_node *n = modules->rb_node;
 961
 962         while (n) {
 963                 struct module_info *m;
 964                 int cmp;
 965
 966                 m = rb_entry(n, struct module_info, rb_node);
 967                 cmp = strcmp(name, m->name);
 968                 if (cmp < 0)
 969                         n = n->rb_left;
 970                 else if (cmp > 0)
 971                         n = n->rb_right;
 972                 else
 973                         return m;
 974         }
 975
 976         return NULL;
 977 }
 978
 979 static int __read_proc_modules(void *arg, const char *name, u64 start,
 980                                u64 size __maybe_unused)
 981 {
 982         struct rb_root *modules = arg;
 983         struct module_info *mi;
 984
 985         mi = zalloc(sizeof(struct module_info));
 986         if (!mi)
 987                 return -ENOMEM;
 988
 989         mi->name = strdup(name);
 990         mi->start = start;
 991
 992         if (!mi->name) {
 993                 free(mi);
 994                 return -ENOMEM;
 995         }
 996
 997         add_module(mi, modules);
 998
 999         return 0;
1000 }
1001
1002 static int read_proc_modules(const char *filename, struct rb_root *modules)
1003 {
1004         if (symbol__restricted_filename(filename, "/proc/modules"))
1005                 return -1;
1006
1007         if (modules__parse(filename, modules, __read_proc_modules)) {
1008                 delete_modules(modules);
1009                 return -1;
1010         }
1011
1012         return 0;
1013 }
1014
1015 int compare_proc_modules(const char *from, const char *to)
1016 {
1017         struct rb_root from_modules = RB_ROOT;
1018         struct rb_root to_modules = RB_ROOT;
1019         struct rb_node *from_node, *to_node;
1020         struct module_info *from_m, *to_m;
1021         int ret = -1;
1022
1023         if (read_proc_modules(from, &from_modules))
1024                 return -1;
1025
1026         if (read_proc_modules(to, &to_modules))
1027                 goto out_delete_from;
1028
1029         from_node = rb_first(&from_modules);
1030         to_node = rb_first(&to_modules);
1031         while (from_node) {
1032                 if (!to_node)
1033                         break;
1034
1035                 from_m = rb_entry(from_node, struct module_info, rb_node);
1036                 to_m = rb_entry(to_node, struct module_info, rb_node);
1037
1038                 if (from_m->start != to_m->start ||
1039                     strcmp(from_m->name, to_m->name))
1040                         break;
1041
1042                 from_node = rb_next(from_node);
1043                 to_node = rb_next(to_node);
1044         }
1045
1046         if (!from_node && !to_node)
1047                 ret = 0;
1048
1049         delete_modules(&to_modules);
1050 out_delete_from:
1051         delete_modules(&from_modules);
1052
1053         return ret;
1054 }
1055
1056 struct map *map_groups__first(struct map_groups *mg)
1057 {
1058         return maps__first(&mg->maps);
1059 }
1060
1061 static int do_validate_kcore_modules(const char *filename,
1062                                   struct map_groups *kmaps)
1063 {
1064         struct rb_root modules = RB_ROOT;
1065         struct map *old_map;
1066         int err;
1067
1068         err = read_proc_modules(filename, &modules);
1069         if (err)
1070                 return err;
1071
1072         old_map = map_groups__first(kmaps);
1073         while (old_map) {
1074                 struct map *next = map_groups__next(old_map);
1075                 struct module_info *mi;
1076
1077                 if (!__map__is_kmodule(old_map)) {
1078                         old_map = next;
1079                         continue;
1080                 }
1081
1082                 /* Module must be in memory at the same address */
1083                 mi = find_module(old_map->dso->short_name, &modules);
1084                 if (!mi || mi->start != old_map->start) {
1085                         err = -EINVAL;
1086                         goto out;
1087                 }
1088
1089                 old_map = next;
1090         }
1091 out:
1092         delete_modules(&modules);
1093         return err;
1094 }
1095
1096 /*
1097  * If kallsyms is referenced by name then we look for filename in the same
1098  * directory.
1099  */
1100 static bool filename_from_kallsyms_filename(char *filename,
1101                                             const char *base_name,
1102                                             const char *kallsyms_filename)
1103 {
1104         char *name;
1105
1106         strcpy(filename, kallsyms_filename);
1107         name = strrchr(filename, '/');
1108         if (!name)
1109                 return false;
1110
1111         name += 1;
1112
1113         if (!strcmp(name, "kallsyms")) {
1114                 strcpy(name, base_name);
1115                 return true;
1116         }
1117
1118         return false;
1119 }
1120
1121 static int validate_kcore_modules(const char *kallsyms_filename,
1122                                   struct map *map)
1123 {
1124         struct map_groups *kmaps = map__kmaps(map);
1125         char modules_filename[PATH_MAX];
1126
1127         if (!kmaps)
1128                 return -EINVAL;
1129
1130         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1131                                              kallsyms_filename))
1132                 return -EINVAL;
1133
1134         if (do_validate_kcore_modules(modules_filename, kmaps))
1135                 return -EINVAL;
1136
1137         return 0;
1138 }
1139
1140 static int validate_kcore_addresses(const char *kallsyms_filename,
1141                                     struct map *map)
1142 {
1143         struct kmap *kmap = map__kmap(map);
1144
1145         if (!kmap)
1146                 return -EINVAL;
1147
1148         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1149                 u64 start;
1150
1151                 if (kallsyms__get_function_start(kallsyms_filename,
1152                                                  kmap->ref_reloc_sym->name, &start))
1153                         return -ENOENT;
1154                 if (start != kmap->ref_reloc_sym->addr)
1155                         return -EINVAL;
1156         }
1157
1158         return validate_kcore_modules(kallsyms_filename, map);
1159 }
1160
1161 struct kcore_mapfn_data {
1162         struct dso *dso;
1163         struct list_head maps;
1164 };
1165
1166 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1167 {
1168         struct kcore_mapfn_data *md = data;
1169         struct map *map;
1170
1171         map = map__new2(start, md->dso);
1172         if (map == NULL)
1173                 return -ENOMEM;
1174
1175         map->end = map->start + len;
1176         map->pgoff = pgoff;
1177
1178         list_add(&map->node, &md->maps);
1179
1180         return 0;
1181 }
1182
1183 /*
1184  * Merges map into map_groups by splitting the new map
1185  * within the existing map regions.
1186  */
1187 int map_groups__merge_in(struct map_groups *kmaps, struct map *new_map)
1188 {
1189         struct map *old_map;
1190         LIST_HEAD(merged);
1191
1192         for (old_map = map_groups__first(kmaps); old_map;
1193              old_map = map_groups__next(old_map)) {
1194
1195                 /* no overload with this one */
1196                 if (new_map->end < old_map->start ||
1197                     new_map->start >= old_map->end)
1198                         continue;
1199
1200                 if (new_map->start < old_map->start) {
1201                         /*
1202                          * |new......
1203                          *       |old....
1204                          */
1205                         if (new_map->end < old_map->end) {
1206                                 /*
1207                                  * |new......|     -> |new..|
1208                                  *       |old....| ->       |old....|
1209                                  */
1210                                 new_map->end = old_map->start;
1211                         } else {
1212                                 /*
1213                                  * |new.............| -> |new..|       |new..|
1214                                  *       |old....|    ->       |old....|
1215                                  */
1216                                 struct map *m = map__clone(new_map);
1217
1218                                 if (!m)
1219                                         return -ENOMEM;
1220
1221                                 m->end = old_map->start;
1222                                 list_add_tail(&m->node, &merged);
1223                                 new_map->start = old_map->end;
1224                         }
1225                 } else {
1226                         /*
1227                          *      |new......
1228                          * |old....
1229                          */
1230                         if (new_map->end < old_map->end) {
1231                                 /*
1232                                  *      |new..|   -> x
1233                                  * |old.........| -> |old.........|
1234                                  */
1235                                 map__put(new_map);
1236                                 new_map = NULL;
1237                                 break;
1238                         } else {
1239                                 /*
1240                                  *      |new......| ->         |new...|
1241                                  * |old....|        -> |old....|
1242                                  */
1243                                 new_map->start = old_map->end;
1244                         }
1245                 }
1246         }
1247
1248         while (!list_empty(&merged)) {
1249                 old_map = list_entry(merged.next, struct map, node);
1250                 list_del_init(&old_map->node);
1251                 map_groups__insert(kmaps, old_map);
1252                 map__put(old_map);
1253         }
1254
1255         if (new_map) {
1256                 map_groups__insert(kmaps, new_map);
1257                 map__put(new_map);
1258         }
1259         return 0;
1260 }
1261
1262 static int dso__load_kcore(struct dso *dso, struct map *map,
1263                            const char *kallsyms_filename)
1264 {
1265         struct map_groups *kmaps = map__kmaps(map);
1266         struct kcore_mapfn_data md;
1267         struct map *old_map, *new_map, *replacement_map = NULL;
1268         struct machine *machine;
1269         bool is_64_bit;
1270         int err, fd;
1271         char kcore_filename[PATH_MAX];
1272         u64 stext;
1273
1274         if (!kmaps)
1275                 return -EINVAL;
1276
1277         machine = kmaps->machine;
1278
1279         /* This function requires that the map is the kernel map */
1280         if (!__map__is_kernel(map))
1281                 return -EINVAL;
1282
1283         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1284                                              kallsyms_filename))
1285                 return -EINVAL;
1286
1287         /* Modules and kernel must be present at their original addresses */
1288         if (validate_kcore_addresses(kallsyms_filename, map))
1289                 return -EINVAL;
1290
1291         md.dso = dso;
1292         INIT_LIST_HEAD(&md.maps);
1293
1294         fd = open(kcore_filename, O_RDONLY);
1295         if (fd < 0) {
1296                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1297                          kcore_filename);
1298                 return -EINVAL;
1299         }
1300
1301         /* Read new maps into temporary lists */
1302         err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1303                               &is_64_bit);
1304         if (err)
1305                 goto out_err;
1306         dso->is_64_bit = is_64_bit;
1307
1308         if (list_empty(&md.maps)) {
1309                 err = -EINVAL;
1310                 goto out_err;
1311         }
1312
1313         /* Remove old maps */
1314         old_map = map_groups__first(kmaps);
1315         while (old_map) {
1316                 struct map *next = map_groups__next(old_map);
1317
1318                 /*
1319                  * We need to preserve eBPF maps even if they are
1320                  * covered by kcore, because we need to access
1321                  * eBPF dso for source data.
1322                  */
1323                 if (old_map != map && !__map__is_bpf_prog(old_map))
1324                         map_groups__remove(kmaps, old_map);
1325                 old_map = next;
1326         }
1327         machine->trampolines_mapped = false;
1328
1329         /* Find the kernel map using the '_stext' symbol */
1330         if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1331                 list_for_each_entry(new_map, &md.maps, node) {
1332                         if (stext >= new_map->start && stext < new_map->end) {
1333                                 replacement_map = new_map;
1334                                 break;
1335                         }
1336                 }
1337         }
1338
1339         if (!replacement_map)
1340                 replacement_map = list_entry(md.maps.next, struct map, node);
1341
1342         /* Add new maps */
1343         while (!list_empty(&md.maps)) {
1344                 new_map = list_entry(md.maps.next, struct map, node);
1345                 list_del_init(&new_map->node);
1346                 if (new_map == replacement_map) {
1347                         map->start      = new_map->start;
1348                         map->end        = new_map->end;
1349                         map->pgoff      = new_map->pgoff;
1350                         map->map_ip     = new_map->map_ip;
1351                         map->unmap_ip   = new_map->unmap_ip;
1352                         /* Ensure maps are correctly ordered */
1353                         map__get(map);
1354                         map_groups__remove(kmaps, map);
1355                         map_groups__insert(kmaps, map);
1356                         map__put(map);
1357                         map__put(new_map);
1358                 } else {
1359                         /*
1360                          * Merge kcore map into existing maps,
1361                          * and ensure that current maps (eBPF)
1362                          * stay intact.
1363                          */
1364                         if (map_groups__merge_in(kmaps, new_map))
1365                                 goto out_err;
1366                 }
1367         }
1368
1369         if (machine__is(machine, "x86_64")) {
1370                 u64 addr;
1371
1372                 /*
1373                  * If one of the corresponding symbols is there, assume the
1374                  * entry trampoline maps are too.
1375                  */
1376                 if (!kallsyms__get_function_start(kallsyms_filename,
1377                                                   ENTRY_TRAMPOLINE_NAME,
1378                                                   &addr))
1379                         machine->trampolines_mapped = true;
1380         }
1381
1382         /*
1383          * Set the data type and long name so that kcore can be read via
1384          * dso__data_read_addr().
1385          */
1386         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1387                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1388         else
1389                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1390         dso__set_long_name(dso, strdup(kcore_filename), true);
1391
1392         close(fd);
1393
1394         if (map->prot & PROT_EXEC)
1395                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1396         else
1397                 pr_debug("Using %s for kernel data\n", kcore_filename);
1398
1399         return 0;
1400
1401 out_err:
1402         while (!list_empty(&md.maps)) {
1403                 map = list_entry(md.maps.next, struct map, node);
1404                 list_del_init(&map->node);
1405                 map__put(map);
1406         }
1407         close(fd);
1408         return -EINVAL;
1409 }
1410
1411 /*
1412  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1413  * delta based on the relocation reference symbol.
1414  */
1415 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1416 {
1417         u64 addr;
1418
1419         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1420                 return 0;
1421
1422         if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1423                 return -1;
1424
1425         *delta = addr - kmap->ref_reloc_sym->addr;
1426         return 0;
1427 }
1428
1429 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1430                          struct map *map, bool no_kcore)
1431 {
1432         struct kmap *kmap = map__kmap(map);
1433         u64 delta = 0;
1434
1435         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1436                 return -1;
1437
1438         if (!kmap || !kmap->kmaps)
1439                 return -1;
1440
1441         if (dso__load_all_kallsyms(dso, filename) < 0)
1442                 return -1;
1443
1444         if (kallsyms__delta(kmap, filename, &delta))
1445                 return -1;
1446
1447         symbols__fixup_end(&dso->symbols);
1448         symbols__fixup_duplicate(&dso->symbols);
1449
1450         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1451                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1452         else
1453                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1454
1455         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1456                 return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
1457         else
1458                 return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
1459 }
1460
1461 int dso__load_kallsyms(struct dso *dso, const char *filename,
1462                        struct map *map)
1463 {
1464         return __dso__load_kallsyms(dso, filename, map, false);
1465 }
1466
1467 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1468 {
1469         char *line = NULL;
1470         size_t n;
1471         FILE *file;
1472         int nr_syms = 0;
1473
1474         file = fopen(map_path, "r");
1475         if (file == NULL)
1476                 goto out_failure;
1477
1478         while (!feof(file)) {
1479                 u64 start, size;
1480                 struct symbol *sym;
1481                 int line_len, len;
1482
1483                 line_len = getline(&line, &n, file);
1484                 if (line_len < 0)
1485                         break;
1486
1487                 if (!line)
1488                         goto out_failure;
1489
1490                 line[--line_len] = '\0'; /* \n */
1491
1492                 len = hex2u64(line, &start);
1493
1494                 len++;
1495                 if (len + 2 >= line_len)
1496                         continue;
1497
1498                 len += hex2u64(line + len, &size);
1499
1500                 len++;
1501                 if (len + 2 >= line_len)
1502                         continue;
1503
1504                 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1505
1506                 if (sym == NULL)
1507                         goto out_delete_line;
1508
1509                 symbols__insert(&dso->symbols, sym);
1510                 nr_syms++;
1511         }
1512
1513         free(line);
1514         fclose(file);
1515
1516         return nr_syms;
1517
1518 out_delete_line:
1519         free(line);
1520 out_failure:
1521         return -1;
1522 }
1523
1524 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1525                                            enum dso_binary_type type)
1526 {
1527         switch (type) {
1528         case DSO_BINARY_TYPE__JAVA_JIT:
1529         case DSO_BINARY_TYPE__DEBUGLINK:
1530         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1531         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1532         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1533         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1534         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1535                 return !kmod && dso->kernel == DSO_TYPE_USER;
1536
1537         case DSO_BINARY_TYPE__KALLSYMS:
1538         case DSO_BINARY_TYPE__VMLINUX:
1539         case DSO_BINARY_TYPE__KCORE:
1540                 return dso->kernel == DSO_TYPE_KERNEL;
1541
1542         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1543         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1544         case DSO_BINARY_TYPE__GUEST_KCORE:
1545                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1546
1547         case DSO_BINARY_TYPE__GUEST_KMODULE:
1548         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1549         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1550         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1551                 /*
1552                  * kernel modules know their symtab type - it's set when
1553                  * creating a module dso in machine__findnew_module_map().
1554                  */
1555                 return kmod && dso->symtab_type == type;
1556
1557         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1558         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1559                 return true;
1560
1561         case DSO_BINARY_TYPE__BPF_PROG_INFO:
1562         case DSO_BINARY_TYPE__NOT_FOUND:
1563         default:
1564                 return false;
1565         }
1566 }
1567
1568 /* Checks for the existence of the perf-<pid>.map file in two different
1569  * locations.  First, if the process is a separate mount namespace, check in
1570  * that namespace using the pid of the innermost pid namespace.  If's not in a
1571  * namespace, or the file can't be found there, try in the mount namespace of
1572  * the tracing process using our view of its pid.
1573  */
1574 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1575                               struct nsinfo **nsip)
1576 {
1577         struct nscookie nsc;
1578         struct nsinfo *nsi;
1579         struct nsinfo *nnsi;
1580         int rc = -1;
1581
1582         nsi = *nsip;
1583
1584         if (nsi->need_setns) {
1585                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1586                 nsinfo__mountns_enter(nsi, &nsc);
1587                 rc = access(filebuf, R_OK);
1588                 nsinfo__mountns_exit(&nsc);
1589                 if (rc == 0)
1590                         return rc;
1591         }
1592
1593         nnsi = nsinfo__copy(nsi);
1594         if (nnsi) {
1595                 nsinfo__put(nsi);
1596
1597                 nnsi->need_setns = false;
1598                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1599                 *nsip = nnsi;
1600                 rc = 0;
1601         }
1602
1603         return rc;
1604 }
1605
1606 int dso__load(struct dso *dso, struct map *map)
1607 {
1608         char *name;
1609         int ret = -1;
1610         u_int i;
1611         struct machine *machine;
1612         char *root_dir = (char *) "";
1613         int ss_pos = 0;
1614         struct symsrc ss_[2];
1615         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1616         bool kmod;
1617         bool perfmap;
1618         unsigned char build_id[BUILD_ID_SIZE];
1619         struct nscookie nsc;
1620         char newmapname[PATH_MAX];
1621         const char *map_path = dso->long_name;
1622
1623         perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1624         if (perfmap) {
1625                 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1626                     sizeof(newmapname), &dso->nsinfo) == 0)) {
1627                         map_path = newmapname;
1628                 }
1629         }
1630
1631         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1632         pthread_mutex_lock(&dso->lock);
1633
1634         /* check again under the dso->lock */
1635         if (dso__loaded(dso)) {
1636                 ret = 1;
1637                 goto out;
1638         }
1639
1640         if (map->groups && map->groups->machine)
1641                 machine = map->groups->machine;
1642         else
1643                 machine = NULL;
1644
1645         if (dso->kernel) {
1646                 if (dso->kernel == DSO_TYPE_KERNEL)
1647                         ret = dso__load_kernel_sym(dso, map);
1648                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1649                         ret = dso__load_guest_kernel_sym(dso, map);
1650
1651                 if (machine__is(machine, "x86_64"))
1652                         machine__map_x86_64_entry_trampolines(machine, dso);
1653                 goto out;
1654         }
1655
1656         dso->adjust_symbols = 0;
1657
1658         if (perfmap) {
1659                 ret = dso__load_perf_map(map_path, dso);
1660                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1661                                              DSO_BINARY_TYPE__NOT_FOUND;
1662                 goto out;
1663         }
1664
1665         if (machine)
1666                 root_dir = machine->root_dir;
1667
1668         name = malloc(PATH_MAX);
1669         if (!name)
1670                 goto out;
1671
1672         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1673                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1674                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1675                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1676
1677
1678         /*
1679          * Read the build id if possible. This is required for
1680          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1681          */
1682         if (!dso->has_build_id &&
1683             is_regular_file(dso->long_name)) {
1684             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1685             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1686                 dso__set_build_id(dso, build_id);
1687         }
1688
1689         /*
1690          * Iterate over candidate debug images.
1691          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1692          * and/or opd section) for processing.
1693          */
1694         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1695                 struct symsrc *ss = &ss_[ss_pos];
1696                 bool next_slot = false;
1697                 bool is_reg;
1698                 bool nsexit;
1699                 int sirc = -1;
1700
1701                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1702
1703                 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1704                     symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1705
1706                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1707                         continue;
1708
1709                 if (dso__read_binary_type_filename(dso, symtab_type,
1710                                                    root_dir, name, PATH_MAX))
1711                         continue;
1712
1713                 if (nsexit)
1714                         nsinfo__mountns_exit(&nsc);
1715
1716                 is_reg = is_regular_file(name);
1717                 if (is_reg)
1718                         sirc = symsrc__init(ss, dso, name, symtab_type);
1719
1720                 if (nsexit)
1721                         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1722
1723                 if (!is_reg || sirc < 0)
1724                         continue;
1725
1726                 if (!syms_ss && symsrc__has_symtab(ss)) {
1727                         syms_ss = ss;
1728                         next_slot = true;
1729                         if (!dso->symsrc_filename)
1730                                 dso->symsrc_filename = strdup(name);
1731                 }
1732
1733                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1734                         runtime_ss = ss;
1735                         next_slot = true;
1736                 }
1737
1738                 if (next_slot) {
1739                         ss_pos++;
1740
1741                         if (syms_ss && runtime_ss)
1742                                 break;
1743                 } else {
1744                         symsrc__destroy(ss);
1745                 }
1746
1747         }
1748
1749         if (!runtime_ss && !syms_ss)
1750                 goto out_free;
1751
1752         if (runtime_ss && !syms_ss) {
1753                 syms_ss = runtime_ss;
1754         }
1755
1756         /* We'll have to hope for the best */
1757         if (!runtime_ss && syms_ss)
1758                 runtime_ss = syms_ss;
1759
1760         if (syms_ss)
1761                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1762         else
1763                 ret = -1;
1764
1765         if (ret > 0) {
1766                 int nr_plt;
1767
1768                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1769                 if (nr_plt > 0)
1770                         ret += nr_plt;
1771         }
1772
1773         for (; ss_pos > 0; ss_pos--)
1774                 symsrc__destroy(&ss_[ss_pos - 1]);
1775 out_free:
1776         free(name);
1777         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1778                 ret = 0;
1779 out:
1780         dso__set_loaded(dso);
1781         pthread_mutex_unlock(&dso->lock);
1782         nsinfo__mountns_exit(&nsc);
1783
1784         return ret;
1785 }
1786
1787 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
1788 {
1789         struct maps *maps = &mg->maps;
1790         struct map *map;
1791         struct rb_node *node;
1792
1793         down_read(&maps->lock);
1794
1795         for (node = maps->names.rb_node; node; ) {
1796                 int rc;
1797
1798                 map = rb_entry(node, struct map, rb_node_name);
1799
1800                 rc = strcmp(map->dso->short_name, name);
1801                 if (rc < 0)
1802                         node = node->rb_left;
1803                 else if (rc > 0)
1804                         node = node->rb_right;
1805                 else
1806
1807                         goto out_unlock;
1808         }
1809
1810         map = NULL;
1811
1812 out_unlock:
1813         up_read(&maps->lock);
1814         return map;
1815 }
1816
1817 int dso__load_vmlinux(struct dso *dso, struct map *map,
1818                       const char *vmlinux, bool vmlinux_allocated)
1819 {
1820         int err = -1;
1821         struct symsrc ss;
1822         char symfs_vmlinux[PATH_MAX];
1823         enum dso_binary_type symtab_type;
1824
1825         if (vmlinux[0] == '/')
1826                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1827         else
1828                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1829
1830         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1831                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1832         else
1833                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1834
1835         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1836                 return -1;
1837
1838         err = dso__load_sym(dso, map, &ss, &ss, 0);
1839         symsrc__destroy(&ss);
1840
1841         if (err > 0) {
1842                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1843                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1844                 else
1845                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1846                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1847                 dso__set_loaded(dso);
1848                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1849         }
1850
1851         return err;
1852 }
1853
1854 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1855 {
1856         int i, err = 0;
1857         char *filename = NULL;
1858
1859         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1860                  vmlinux_path__nr_entries + 1);
1861
1862         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1863                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1864                 if (err > 0)
1865                         goto out;
1866         }
1867
1868         if (!symbol_conf.ignore_vmlinux_buildid)
1869                 filename = dso__build_id_filename(dso, NULL, 0, false);
1870         if (filename != NULL) {
1871                 err = dso__load_vmlinux(dso, map, filename, true);
1872                 if (err > 0)
1873                         goto out;
1874                 free(filename);
1875         }
1876 out:
1877         return err;
1878 }
1879
1880 static bool visible_dir_filter(const char *name, struct dirent *d)
1881 {
1882         if (d->d_type != DT_DIR)
1883                 return false;
1884         return lsdir_no_dot_filter(name, d);
1885 }
1886
1887 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1888 {
1889         char kallsyms_filename[PATH_MAX];
1890         int ret = -1;
1891         struct strlist *dirs;
1892         struct str_node *nd;
1893
1894         dirs = lsdir(dir, visible_dir_filter);
1895         if (!dirs)
1896                 return -1;
1897
1898         strlist__for_each_entry(nd, dirs) {
1899                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1900                           "%s/%s/kallsyms", dir, nd->s);
1901                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1902                         strlcpy(dir, kallsyms_filename, dir_sz);
1903                         ret = 0;
1904                         break;
1905                 }
1906         }
1907
1908         strlist__delete(dirs);
1909
1910         return ret;
1911 }
1912
1913 /*
1914  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1915  * since access(R_OK) only checks with real UID/GID but open() use effective
1916  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1917  */
1918 static bool filename__readable(const char *file)
1919 {
1920         int fd = open(file, O_RDONLY);
1921         if (fd < 0)
1922                 return false;
1923         close(fd);
1924         return true;
1925 }
1926
1927 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1928 {
1929         u8 host_build_id[BUILD_ID_SIZE];
1930         char sbuild_id[SBUILD_ID_SIZE];
1931         bool is_host = false;
1932         char path[PATH_MAX];
1933
1934         if (!dso->has_build_id) {
1935                 /*
1936                  * Last resort, if we don't have a build-id and couldn't find
1937                  * any vmlinux file, try the running kernel kallsyms table.
1938                  */
1939                 goto proc_kallsyms;
1940         }
1941
1942         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1943                                  sizeof(host_build_id)) == 0)
1944                 is_host = dso__build_id_equal(dso, host_build_id);
1945
1946         /* Try a fast path for /proc/kallsyms if possible */
1947         if (is_host) {
1948                 /*
1949                  * Do not check the build-id cache, unless we know we cannot use
1950                  * /proc/kcore or module maps don't match to /proc/kallsyms.
1951                  * To check readability of /proc/kcore, do not use access(R_OK)
1952                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1953                  * can't check it.
1954                  */
1955                 if (filename__readable("/proc/kcore") &&
1956                     !validate_kcore_addresses("/proc/kallsyms", map))
1957                         goto proc_kallsyms;
1958         }
1959
1960         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1961
1962         /* Find kallsyms in build-id cache with kcore */
1963         scnprintf(path, sizeof(path), "%s/%s/%s",
1964                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
1965
1966         if (!find_matching_kcore(map, path, sizeof(path)))
1967                 return strdup(path);
1968
1969         /* Use current /proc/kallsyms if possible */
1970         if (is_host) {
1971 proc_kallsyms:
1972                 return strdup("/proc/kallsyms");
1973         }
1974
1975         /* Finally, find a cache of kallsyms */
1976         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1977                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1978                        sbuild_id);
1979                 return NULL;
1980         }
1981
1982         return strdup(path);
1983 }
1984
1985 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1986 {
1987         int err;
1988         const char *kallsyms_filename = NULL;
1989         char *kallsyms_allocated_filename = NULL;
1990         /*
1991          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1992          * it and only it, reporting errors to the user if it cannot be used.
1993          *
1994          * For instance, try to analyse an ARM perf.data file _without_ a
1995          * build-id, or if the user specifies the wrong path to the right
1996          * vmlinux file, obviously we can't fallback to another vmlinux (a
1997          * x86_86 one, on the machine where analysis is being performed, say),
1998          * or worse, /proc/kallsyms.
1999          *
2000          * If the specified file _has_ a build-id and there is a build-id
2001          * section in the perf.data file, we will still do the expected
2002          * validation in dso__load_vmlinux and will bail out if they don't
2003          * match.
2004          */
2005         if (symbol_conf.kallsyms_name != NULL) {
2006                 kallsyms_filename = symbol_conf.kallsyms_name;
2007                 goto do_kallsyms;
2008         }
2009
2010         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2011                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2012         }
2013
2014         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2015                 err = dso__load_vmlinux_path(dso, map);
2016                 if (err > 0)
2017                         return err;
2018         }
2019
2020         /* do not try local files if a symfs was given */
2021         if (symbol_conf.symfs[0] != 0)
2022                 return -1;
2023
2024         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2025         if (!kallsyms_allocated_filename)
2026                 return -1;
2027
2028         kallsyms_filename = kallsyms_allocated_filename;
2029
2030 do_kallsyms:
2031         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2032         if (err > 0)
2033                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2034         free(kallsyms_allocated_filename);
2035
2036         if (err > 0 && !dso__is_kcore(dso)) {
2037                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2038                 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2039                 map__fixup_start(map);
2040                 map__fixup_end(map);
2041         }
2042
2043         return err;
2044 }
2045
2046 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2047 {
2048         int err;
2049         const char *kallsyms_filename = NULL;
2050         struct machine *machine;
2051         char path[PATH_MAX];
2052
2053         if (!map->groups) {
2054                 pr_debug("Guest kernel map hasn't the point to groups\n");
2055                 return -1;
2056         }
2057         machine = map->groups->machine;
2058
2059         if (machine__is_default_guest(machine)) {
2060                 /*
2061                  * if the user specified a vmlinux filename, use it and only
2062                  * it, reporting errors to the user if it cannot be used.
2063                  * Or use file guest_kallsyms inputted by user on commandline
2064                  */
2065                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2066                         err = dso__load_vmlinux(dso, map,
2067                                                 symbol_conf.default_guest_vmlinux_name,
2068                                                 false);
2069                         return err;
2070                 }
2071
2072                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2073                 if (!kallsyms_filename)
2074                         return -1;
2075         } else {
2076                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2077                 kallsyms_filename = path;
2078         }
2079
2080         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2081         if (err > 0)
2082                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2083         if (err > 0 && !dso__is_kcore(dso)) {
2084                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2085                 dso__set_long_name(dso, machine->mmap_name, false);
2086                 map__fixup_start(map);
2087                 map__fixup_end(map);
2088         }
2089
2090         return err;
2091 }
2092
2093 static void vmlinux_path__exit(void)
2094 {
2095         while (--vmlinux_path__nr_entries >= 0)
2096                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2097         vmlinux_path__nr_entries = 0;
2098
2099         zfree(&vmlinux_path);
2100 }
2101
2102 static const char * const vmlinux_paths[] = {
2103         "vmlinux",
2104         "/boot/vmlinux"
2105 };
2106
2107 static const char * const vmlinux_paths_upd[] = {
2108         "/boot/vmlinux-%s",
2109         "/usr/lib/debug/boot/vmlinux-%s",
2110         "/lib/modules/%s/build/vmlinux",
2111         "/usr/lib/debug/lib/modules/%s/vmlinux",
2112         "/usr/lib/debug/boot/vmlinux-%s.debug"
2113 };
2114
2115 static int vmlinux_path__add(const char *new_entry)
2116 {
2117         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2118         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2119                 return -1;
2120         ++vmlinux_path__nr_entries;
2121
2122         return 0;
2123 }
2124
2125 static int vmlinux_path__init(struct perf_env *env)
2126 {
2127         struct utsname uts;
2128         char bf[PATH_MAX];
2129         char *kernel_version;
2130         unsigned int i;
2131
2132         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2133                               ARRAY_SIZE(vmlinux_paths_upd)));
2134         if (vmlinux_path == NULL)
2135                 return -1;
2136
2137         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2138                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2139                         goto out_fail;
2140
2141         /* only try kernel version if no symfs was given */
2142         if (symbol_conf.symfs[0] != 0)
2143                 return 0;
2144
2145         if (env) {
2146                 kernel_version = env->os_release;
2147         } else {
2148                 if (uname(&uts) < 0)
2149                         goto out_fail;
2150
2151                 kernel_version = uts.release;
2152         }
2153
2154         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2155                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2156                 if (vmlinux_path__add(bf) < 0)
2157                         goto out_fail;
2158         }
2159
2160         return 0;
2161
2162 out_fail:
2163         vmlinux_path__exit();
2164         return -1;
2165 }
2166
2167 int setup_list(struct strlist **list, const char *list_str,
2168                       const char *list_name)
2169 {
2170         if (list_str == NULL)
2171                 return 0;
2172
2173         *list = strlist__new(list_str, NULL);
2174         if (!*list) {
2175                 pr_err("problems parsing %s list\n", list_name);
2176                 return -1;
2177         }
2178
2179         symbol_conf.has_filter = true;
2180         return 0;
2181 }
2182
2183 int setup_intlist(struct intlist **list, const char *list_str,
2184                   const char *list_name)
2185 {
2186         if (list_str == NULL)
2187                 return 0;
2188
2189         *list = intlist__new(list_str);
2190         if (!*list) {
2191                 pr_err("problems parsing %s list\n", list_name);
2192                 return -1;
2193         }
2194         return 0;
2195 }
2196
2197 static bool symbol__read_kptr_restrict(void)
2198 {
2199         bool value = false;
2200         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2201
2202         if (fp != NULL) {
2203                 char line[8];
2204
2205                 if (fgets(line, sizeof(line), fp) != NULL)
2206                         value = perf_cap__capable(CAP_SYSLOG) ?
2207                                         (atoi(line) >= 2) :
2208                                         (atoi(line) != 0);
2209
2210                 fclose(fp);
2211         }
2212
2213         /* Per kernel/kallsyms.c:
2214          * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2215          */
2216         if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2217                 value = true;
2218
2219         return value;
2220 }
2221
2222 int symbol__annotation_init(void)
2223 {
2224         if (symbol_conf.init_annotation)
2225                 return 0;
2226
2227         if (symbol_conf.initialized) {
2228                 pr_err("Annotation needs to be init before symbol__init()\n");
2229                 return -1;
2230         }
2231
2232         symbol_conf.priv_size += sizeof(struct annotation);
2233         symbol_conf.init_annotation = true;
2234         return 0;
2235 }
2236
2237 int symbol__init(struct perf_env *env)
2238 {
2239         const char *symfs;
2240
2241         if (symbol_conf.initialized)
2242                 return 0;
2243
2244         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2245
2246         symbol__elf_init();
2247
2248         if (symbol_conf.sort_by_name)
2249                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2250                                           sizeof(struct symbol));
2251
2252         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2253                 return -1;
2254
2255         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2256                 pr_err("'.' is the only non valid --field-separator argument\n");
2257                 return -1;
2258         }
2259
2260         if (setup_list(&symbol_conf.dso_list,
2261                        symbol_conf.dso_list_str, "dso") < 0)
2262                 return -1;
2263
2264         if (setup_list(&symbol_conf.comm_list,
2265                        symbol_conf.comm_list_str, "comm") < 0)
2266                 goto out_free_dso_list;
2267
2268         if (setup_intlist(&symbol_conf.pid_list,
2269                        symbol_conf.pid_list_str, "pid") < 0)
2270                 goto out_free_comm_list;
2271
2272         if (setup_intlist(&symbol_conf.tid_list,
2273                        symbol_conf.tid_list_str, "tid") < 0)
2274                 goto out_free_pid_list;
2275
2276         if (setup_list(&symbol_conf.sym_list,
2277                        symbol_conf.sym_list_str, "symbol") < 0)
2278                 goto out_free_tid_list;
2279
2280         if (setup_list(&symbol_conf.bt_stop_list,
2281                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2282                 goto out_free_sym_list;
2283
2284         /*
2285          * A path to symbols of "/" is identical to ""
2286          * reset here for simplicity.
2287          */
2288         symfs = realpath(symbol_conf.symfs, NULL);
2289         if (symfs == NULL)
2290                 symfs = symbol_conf.symfs;
2291         if (strcmp(symfs, "/") == 0)
2292                 symbol_conf.symfs = "";
2293         if (symfs != symbol_conf.symfs)
2294                 free((void *)symfs);
2295
2296         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2297
2298         symbol_conf.initialized = true;
2299         return 0;
2300
2301 out_free_sym_list:
2302         strlist__delete(symbol_conf.sym_list);
2303 out_free_tid_list:
2304         intlist__delete(symbol_conf.tid_list);
2305 out_free_pid_list:
2306         intlist__delete(symbol_conf.pid_list);
2307 out_free_comm_list:
2308         strlist__delete(symbol_conf.comm_list);
2309 out_free_dso_list:
2310         strlist__delete(symbol_conf.dso_list);
2311         return -1;
2312 }
2313
2314 void symbol__exit(void)
2315 {
2316         if (!symbol_conf.initialized)
2317                 return;
2318         strlist__delete(symbol_conf.bt_stop_list);
2319         strlist__delete(symbol_conf.sym_list);
2320         strlist__delete(symbol_conf.dso_list);
2321         strlist__delete(symbol_conf.comm_list);
2322         intlist__delete(symbol_conf.tid_list);
2323         intlist__delete(symbol_conf.pid_list);
2324         vmlinux_path__exit();
2325         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2326         symbol_conf.bt_stop_list = NULL;
2327         symbol_conf.initialized = false;
2328 }
2329
2330 int symbol__config_symfs(const struct option *opt __maybe_unused,
2331                          const char *dir, int unset __maybe_unused)
2332 {
2333         char *bf = NULL;
2334         int ret;
2335
2336         symbol_conf.symfs = strdup(dir);
2337         if (symbol_conf.symfs == NULL)
2338                 return -ENOMEM;
2339
2340         /* skip the locally configured cache if a symfs is given, and
2341          * config buildid dir to symfs/.debug
2342          */
2343         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2344         if (ret < 0)
2345                 return -ENOMEM;
2346
2347         set_buildid_dir(bf);
2348
2349         free(bf);
2350         return 0;
2351 }
2352
2353 struct mem_info *mem_info__get(struct mem_info *mi)
2354 {
2355         if (mi)
2356                 refcount_inc(&mi->refcnt);
2357         return mi;
2358 }
2359
2360 void mem_info__put(struct mem_info *mi)
2361 {
2362         if (mi && refcount_dec_and_test(&mi->refcnt))
2363                 free(mi);
2364 }
2365
2366 struct mem_info *mem_info__new(void)
2367 {
2368         struct mem_info *mi = zalloc(sizeof(*mi));
2369
2370         if (mi)
2371                 refcount_set(&mi->refcnt, 1);
2372         return mi;
2373 }
2374
2375 struct block_info *block_info__get(struct block_info *bi)
2376 {
2377         if (bi)
2378                 refcount_inc(&bi->refcnt);
2379         return bi;
2380 }
2381
2382 void block_info__put(struct block_info *bi)
2383 {
2384         if (bi && refcount_dec_and_test(&bi->refcnt))
2385                 free(bi);
2386 }
2387
2388 struct block_info *block_info__new(void)
2389 {
2390         struct block_info *bi = zalloc(sizeof(*bi));
2391
2392         if (bi)
2393                 refcount_set(&bi->refcnt, 1);
2394         return bi;
2395 }