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