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__MIXEDUP_UBUNTU_DEBUGINFO,
  83         DSO_BINARY_TYPE__NOT_FOUND,
  84 };
  85
  86 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  87
  88 static bool symbol_type__filter(char symbol_type)
  89 {
  90         symbol_type = toupper(symbol_type);
  91         return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
  92 }
  93
  94 static int prefix_underscores_count(const char *str)
  95 {
  96         const char *tail = str;
  97
  98         while (*tail == '_')
  99                 tail++;
 100
 101         return tail - str;
 102 }
 103
 104 void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
 105 {
 106         p->end = c->start;
 107 }
 108
 109 const char * __weak arch__normalize_symbol_name(const char *name)
 110 {
 111         return name;
 112 }
 113
 114 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
 115 {
 116         return strcmp(namea, nameb);
 117 }
 118
 119 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
 120                                         unsigned int n)
 121 {
 122         return strncmp(namea, nameb, n);
 123 }
 124
 125 int __weak arch__choose_best_symbol(struct symbol *syma,
 126                                     struct symbol *symb __maybe_unused)
 127 {
 128         /* Avoid "SyS" kernel syscall aliases */
 129         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
 130                 return SYMBOL_B;
 131         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 132                 return SYMBOL_B;
 133
 134         return SYMBOL_A;
 135 }
 136
 137 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 138 {
 139         s64 a;
 140         s64 b;
 141         size_t na, nb;
 142
 143         /* Prefer a symbol with non zero length */
 144         a = syma->end - syma->start;
 145         b = symb->end - symb->start;
 146         if ((b == 0) && (a > 0))
 147                 return SYMBOL_A;
 148         else if ((a == 0) && (b > 0))
 149                 return SYMBOL_B;
 150
 151         /* Prefer a non weak symbol over a weak one */
 152         a = syma->binding == STB_WEAK;
 153         b = symb->binding == STB_WEAK;
 154         if (b && !a)
 155                 return SYMBOL_A;
 156         if (a && !b)
 157                 return SYMBOL_B;
 158
 159         /* Prefer a global symbol over a non global one */
 160         a = syma->binding == STB_GLOBAL;
 161         b = symb->binding == STB_GLOBAL;
 162         if (a && !b)
 163                 return SYMBOL_A;
 164         if (b && !a)
 165                 return SYMBOL_B;
 166
 167         /* Prefer a symbol with less underscores */
 168         a = prefix_underscores_count(syma->name);
 169         b = prefix_underscores_count(symb->name);
 170         if (b > a)
 171                 return SYMBOL_A;
 172         else if (a > b)
 173                 return SYMBOL_B;
 174
 175         /* Choose the symbol with the longest name */
 176         na = strlen(syma->name);
 177         nb = strlen(symb->name);
 178         if (na > nb)
 179                 return SYMBOL_A;
 180         else if (na < nb)
 181                 return SYMBOL_B;
 182
 183         return arch__choose_best_symbol(syma, symb);
 184 }
 185
 186 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
 187 {
 188         struct rb_node *nd;
 189         struct symbol *curr, *next;
 190
 191         if (symbol_conf.allow_aliases)
 192                 return;
 193
 194         nd = rb_first_cached(symbols);
 195
 196         while (nd) {
 197                 curr = rb_entry(nd, struct symbol, rb_node);
 198 again:
 199                 nd = rb_next(&curr->rb_node);
 200                 next = rb_entry(nd, struct symbol, rb_node);
 201
 202                 if (!nd)
 203                         break;
 204
 205                 if (curr->start != next->start)
 206                         continue;
 207
 208                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 209                         rb_erase_cached(&next->rb_node, symbols);
 210                         symbol__delete(next);
 211                         goto again;
 212                 } else {
 213                         nd = rb_next(&curr->rb_node);
 214                         rb_erase_cached(&curr->rb_node, symbols);
 215                         symbol__delete(curr);
 216                 }
 217         }
 218 }
 219
 220 void symbols__fixup_end(struct rb_root_cached *symbols)
 221 {
 222         struct rb_node *nd, *prevnd = rb_first_cached(symbols);
 223         struct symbol *curr, *prev;
 224
 225         if (prevnd == NULL)
 226                 return;
 227
 228         curr = rb_entry(prevnd, struct symbol, rb_node);
 229
 230         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 231                 prev = curr;
 232                 curr = rb_entry(nd, struct symbol, rb_node);
 233
 234                 if (prev->end == prev->start && prev->end != curr->start)
 235                         arch__symbols__fixup_end(prev, curr);
 236         }
 237
 238         /* Last entry */
 239         if (curr->end == curr->start)
 240                 curr->end = roundup(curr->start, 4096) + 4096;
 241 }
 242
 243 void maps__fixup_end(struct maps *maps)
 244 {
 245         struct map *prev = NULL, *curr;
 246
 247         down_write(&maps->lock);
 248
 249         maps__for_each_entry(maps, curr) {
 250                 if (prev != NULL && !prev->end)
 251                         prev->end = curr->start;
 252
 253                 prev = curr;
 254         }
 255
 256         /*
 257          * We still haven't the actual symbols, so guess the
 258          * last map final address.
 259          */
 260         if (curr && !curr->end)
 261                 curr->end = ~0ULL;
 262
 263         up_write(&maps->lock);
 264 }
 265
 266 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
 267 {
 268         size_t namelen = strlen(name) + 1;
 269         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 270                                         sizeof(*sym) + namelen));
 271         if (sym == NULL)
 272                 return NULL;
 273
 274         if (symbol_conf.priv_size) {
 275                 if (symbol_conf.init_annotation) {
 276                         struct annotation *notes = (void *)sym;
 277                         pthread_mutex_init(&notes->lock, NULL);
 278                 }
 279                 sym = ((void *)sym) + symbol_conf.priv_size;
 280         }
 281
 282         sym->start   = start;
 283         sym->end     = len ? start + len : start;
 284         sym->type    = type;
 285         sym->binding = binding;
 286         sym->namelen = namelen - 1;
 287
 288         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 289                   __func__, name, start, sym->end);
 290         memcpy(sym->name, name, namelen);
 291
 292         return sym;
 293 }
 294
 295 void symbol__delete(struct symbol *sym)
 296 {
 297         free(((void *)sym) - symbol_conf.priv_size);
 298 }
 299
 300 void symbols__delete(struct rb_root_cached *symbols)
 301 {
 302         struct symbol *pos;
 303         struct rb_node *next = rb_first_cached(symbols);
 304
 305         while (next) {
 306                 pos = rb_entry(next, struct symbol, rb_node);
 307                 next = rb_next(&pos->rb_node);
 308                 rb_erase_cached(&pos->rb_node, symbols);
 309                 symbol__delete(pos);
 310         }
 311 }
 312
 313 void __symbols__insert(struct rb_root_cached *symbols,
 314                        struct symbol *sym, bool kernel)
 315 {
 316         struct rb_node **p = &symbols->rb_root.rb_node;
 317         struct rb_node *parent = NULL;
 318         const u64 ip = sym->start;
 319         struct symbol *s;
 320         bool leftmost = true;
 321
 322         if (kernel) {
 323                 const char *name = sym->name;
 324                 /*
 325                  * ppc64 uses function descriptors and appends a '.' to the
 326                  * start of every instruction address. Remove it.
 327                  */
 328                 if (name[0] == '.')
 329                         name++;
 330                 sym->idle = symbol__is_idle(name);
 331         }
 332
 333         while (*p != NULL) {
 334                 parent = *p;
 335                 s = rb_entry(parent, struct symbol, rb_node);
 336                 if (ip < s->start)
 337                         p = &(*p)->rb_left;
 338                 else {
 339                         p = &(*p)->rb_right;
 340                         leftmost = false;
 341                 }
 342         }
 343         rb_link_node(&sym->rb_node, parent, p);
 344         rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
 345 }
 346
 347 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
 348 {
 349         __symbols__insert(symbols, sym, false);
 350 }
 351
 352 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
 353 {
 354         struct rb_node *n;
 355
 356         if (symbols == NULL)
 357                 return NULL;
 358
 359         n = symbols->rb_root.rb_node;
 360
 361         while (n) {
 362                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 363
 364                 if (ip < s->start)
 365                         n = n->rb_left;
 366                 else if (ip > s->end || (ip == s->end && ip != s->start))
 367                         n = n->rb_right;
 368                 else
 369                         return s;
 370         }
 371
 372         return NULL;
 373 }
 374
 375 static struct symbol *symbols__first(struct rb_root_cached *symbols)
 376 {
 377         struct rb_node *n = rb_first_cached(symbols);
 378
 379         if (n)
 380                 return rb_entry(n, struct symbol, rb_node);
 381
 382         return NULL;
 383 }
 384
 385 static struct symbol *symbols__last(struct rb_root_cached *symbols)
 386 {
 387         struct rb_node *n = rb_last(&symbols->rb_root);
 388
 389         if (n)
 390                 return rb_entry(n, struct symbol, rb_node);
 391
 392         return NULL;
 393 }
 394
 395 static struct symbol *symbols__next(struct symbol *sym)
 396 {
 397         struct rb_node *n = rb_next(&sym->rb_node);
 398
 399         if (n)
 400                 return rb_entry(n, struct symbol, rb_node);
 401
 402         return NULL;
 403 }
 404
 405 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
 406 {
 407         struct rb_node **p = &symbols->rb_root.rb_node;
 408         struct rb_node *parent = NULL;
 409         struct symbol_name_rb_node *symn, *s;
 410         bool leftmost = true;
 411
 412         symn = container_of(sym, struct symbol_name_rb_node, sym);
 413
 414         while (*p != NULL) {
 415                 parent = *p;
 416                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 417                 if (strcmp(sym->name, s->sym.name) < 0)
 418                         p = &(*p)->rb_left;
 419                 else {
 420                         p = &(*p)->rb_right;
 421                         leftmost = false;
 422                 }
 423         }
 424         rb_link_node(&symn->rb_node, parent, p);
 425         rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
 426 }
 427
 428 static void symbols__sort_by_name(struct rb_root_cached *symbols,
 429                                   struct rb_root_cached *source)
 430 {
 431         struct rb_node *nd;
 432
 433         for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
 434                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 435                 symbols__insert_by_name(symbols, pos);
 436         }
 437 }
 438
 439 int symbol__match_symbol_name(const char *name, const char *str,
 440                               enum symbol_tag_include includes)
 441 {
 442         const char *versioning;
 443
 444         if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
 445             (versioning = strstr(name, "@@"))) {
 446                 int len = strlen(str);
 447
 448                 if (len < versioning - name)
 449                         len = versioning - name;
 450
 451                 return arch__compare_symbol_names_n(name, str, len);
 452         } else
 453                 return arch__compare_symbol_names(name, str);
 454 }
 455
 456 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
 457                                             const char *name,
 458                                             enum symbol_tag_include includes)
 459 {
 460         struct rb_node *n;
 461         struct symbol_name_rb_node *s = NULL;
 462
 463         if (symbols == NULL)
 464                 return NULL;
 465
 466         n = symbols->rb_root.rb_node;
 467
 468         while (n) {
 469                 int cmp;
 470
 471                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 472                 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
 473
 474                 if (cmp > 0)
 475                         n = n->rb_left;
 476                 else if (cmp < 0)
 477                         n = n->rb_right;
 478                 else
 479                         break;
 480         }
 481
 482         if (n == NULL)
 483                 return NULL;
 484
 485         if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
 486                 /* return first symbol that has same name (if any) */
 487                 for (n = rb_prev(n); n; n = rb_prev(n)) {
 488                         struct symbol_name_rb_node *tmp;
 489
 490                         tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 491                         if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
 492                                 break;
 493
 494                         s = tmp;
 495                 }
 496
 497         return &s->sym;
 498 }
 499
 500 void dso__reset_find_symbol_cache(struct dso *dso)
 501 {
 502         dso->last_find_result.addr   = 0;
 503         dso->last_find_result.symbol = NULL;
 504 }
 505
 506 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
 507 {
 508         __symbols__insert(&dso->symbols, sym, dso->kernel);
 509
 510         /* update the symbol cache if necessary */
 511         if (dso->last_find_result.addr >= sym->start &&
 512             (dso->last_find_result.addr < sym->end ||
 513             sym->start == sym->end)) {
 514                 dso->last_find_result.symbol = sym;
 515         }
 516 }
 517
 518 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
 519 {
 520         if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
 521                 dso->last_find_result.addr   = addr;
 522                 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
 523         }
 524
 525         return dso->last_find_result.symbol;
 526 }
 527
 528 struct symbol *dso__first_symbol(struct dso *dso)
 529 {
 530         return symbols__first(&dso->symbols);
 531 }
 532
 533 struct symbol *dso__last_symbol(struct dso *dso)
 534 {
 535         return symbols__last(&dso->symbols);
 536 }
 537
 538 struct symbol *dso__next_symbol(struct symbol *sym)
 539 {
 540         return symbols__next(sym);
 541 }
 542
 543 struct symbol *symbol__next_by_name(struct symbol *sym)
 544 {
 545         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 546         struct rb_node *n = rb_next(&s->rb_node);
 547
 548         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 549 }
 550
 551  /*
 552   * Returns first symbol that matched with @name.
 553   */
 554 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
 555 {
 556         struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
 557                                                  SYMBOL_TAG_INCLUDE__NONE);
 558         if (!s)
 559                 s = symbols__find_by_name(&dso->symbol_names, name,
 560                                           SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
 561         return s;
 562 }
 563
 564 void dso__sort_by_name(struct dso *dso)
 565 {
 566         dso__set_sorted_by_name(dso);
 567         return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
 568 }
 569
 570 /*
 571  * While we find nice hex chars, build a long_val.
 572  * Return number of chars processed.
 573  */
 574 static int hex2u64(const char *ptr, u64 *long_val)
 575 {
 576         char *p;
 577
 578         *long_val = strtoull(ptr, &p, 16);
 579
 580         return p - ptr;
 581 }
 582
 583
 584 int modules__parse(const char *filename, void *arg,
 585                    int (*process_module)(void *arg, const char *name,
 586                                          u64 start, u64 size))
 587 {
 588         char *line = NULL;
 589         size_t n;
 590         FILE *file;
 591         int err = 0;
 592
 593         file = fopen(filename, "r");
 594         if (file == NULL)
 595                 return -1;
 596
 597         while (1) {
 598                 char name[PATH_MAX];
 599                 u64 start, size;
 600                 char *sep, *endptr;
 601                 ssize_t line_len;
 602
 603                 line_len = getline(&line, &n, file);
 604                 if (line_len < 0) {
 605                         if (feof(file))
 606                                 break;
 607                         err = -1;
 608                         goto out;
 609                 }
 610
 611                 if (!line) {
 612                         err = -1;
 613                         goto out;
 614                 }
 615
 616                 line[--line_len] = '\0'; /* \n */
 617
 618                 sep = strrchr(line, 'x');
 619                 if (sep == NULL)
 620                         continue;
 621
 622                 hex2u64(sep + 1, &start);
 623
 624                 sep = strchr(line, ' ');
 625                 if (sep == NULL)
 626                         continue;
 627
 628                 *sep = '\0';
 629
 630                 scnprintf(name, sizeof(name), "[%s]", line);
 631
 632                 size = strtoul(sep + 1, &endptr, 0);
 633                 if (*endptr != ' ' && *endptr != '\t')
 634                         continue;
 635
 636                 err = process_module(arg, name, start, size);
 637                 if (err)
 638                         break;
 639         }
 640 out:
 641         free(line);
 642         fclose(file);
 643         return err;
 644 }
 645
 646 /*
 647  * These are symbols in the kernel image, so make sure that
 648  * sym is from a kernel DSO.
 649  */
 650 static bool symbol__is_idle(const char *name)
 651 {
 652         const char * const idle_symbols[] = {
 653                 "acpi_idle_do_entry",
 654                 "acpi_processor_ffh_cstate_enter",
 655                 "arch_cpu_idle",
 656                 "cpu_idle",
 657                 "cpu_startup_entry",
 658                 "idle_cpu",
 659                 "intel_idle",
 660                 "default_idle",
 661                 "native_safe_halt",
 662                 "enter_idle",
 663                 "exit_idle",
 664                 "mwait_idle",
 665                 "mwait_idle_with_hints",
 666                 "poll_idle",
 667                 "ppc64_runlatch_off",
 668                 "pseries_dedicated_idle_sleep",
 669                 NULL
 670         };
 671         int i;
 672         static struct strlist *idle_symbols_list;
 673
 674         if (idle_symbols_list)
 675                 return strlist__has_entry(idle_symbols_list, name);
 676
 677         idle_symbols_list = strlist__new(NULL, NULL);
 678
 679         for (i = 0; idle_symbols[i]; i++)
 680                 strlist__add(idle_symbols_list, idle_symbols[i]);
 681
 682         return strlist__has_entry(idle_symbols_list, name);
 683 }
 684
 685 static int map__process_kallsym_symbol(void *arg, const char *name,
 686                                        char type, u64 start)
 687 {
 688         struct symbol *sym;
 689         struct dso *dso = arg;
 690         struct rb_root_cached *root = &dso->symbols;
 691
 692         if (!symbol_type__filter(type))
 693                 return 0;
 694
 695         /*
 696          * module symbols are not sorted so we add all
 697          * symbols, setting length to 0, and rely on
 698          * symbols__fixup_end() to fix it up.
 699          */
 700         sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 701         if (sym == NULL)
 702                 return -ENOMEM;
 703         /*
 704          * We will pass the symbols to the filter later, in
 705          * map__split_kallsyms, when we have split the maps per module
 706          */
 707         __symbols__insert(root, sym, !strchr(name, '['));
 708
 709         return 0;
 710 }
 711
 712 /*
 713  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 714  * so that we can in the next step set the symbol ->end address and then
 715  * call kernel_maps__split_kallsyms.
 716  */
 717 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 718 {
 719         return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 720 }
 721
 722 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
 723 {
 724         struct map *curr_map;
 725         struct symbol *pos;
 726         int count = 0;
 727         struct rb_root_cached old_root = dso->symbols;
 728         struct rb_root_cached *root = &dso->symbols;
 729         struct rb_node *next = rb_first_cached(root);
 730
 731         if (!kmaps)
 732                 return -1;
 733
 734         *root = RB_ROOT_CACHED;
 735
 736         while (next) {
 737                 char *module;
 738
 739                 pos = rb_entry(next, struct symbol, rb_node);
 740                 next = rb_next(&pos->rb_node);
 741
 742                 rb_erase_cached(&pos->rb_node, &old_root);
 743                 RB_CLEAR_NODE(&pos->rb_node);
 744                 module = strchr(pos->name, '\t');
 745                 if (module)
 746                         *module = '\0';
 747
 748                 curr_map = maps__find(kmaps, pos->start);
 749
 750                 if (!curr_map) {
 751                         symbol__delete(pos);
 752                         continue;
 753                 }
 754
 755                 pos->start -= curr_map->start - curr_map->pgoff;
 756                 if (pos->end > curr_map->end)
 757                         pos->end = curr_map->end;
 758                 if (pos->end)
 759                         pos->end -= curr_map->start - curr_map->pgoff;
 760                 symbols__insert(&curr_map->dso->symbols, pos);
 761                 ++count;
 762         }
 763
 764         /* Symbols have been adjusted */
 765         dso->adjust_symbols = 1;
 766
 767         return count;
 768 }
 769
 770 /*
 771  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 772  * kernel range is broken in several maps, named [kernel].N, as we don't have
 773  * the original ELF section names vmlinux have.
 774  */
 775 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 776                                 struct map *initial_map)
 777 {
 778         struct machine *machine;
 779         struct map *curr_map = initial_map;
 780         struct symbol *pos;
 781         int count = 0, moved = 0;
 782         struct rb_root_cached *root = &dso->symbols;
 783         struct rb_node *next = rb_first_cached(root);
 784         int kernel_range = 0;
 785         bool x86_64;
 786
 787         if (!kmaps)
 788                 return -1;
 789
 790         machine = kmaps->machine;
 791
 792         x86_64 = machine__is(machine, "x86_64");
 793
 794         while (next) {
 795                 char *module;
 796
 797                 pos = rb_entry(next, struct symbol, rb_node);
 798                 next = rb_next(&pos->rb_node);
 799
 800                 module = strchr(pos->name, '\t');
 801                 if (module) {
 802                         if (!symbol_conf.use_modules)
 803                                 goto discard_symbol;
 804
 805                         *module++ = '\0';
 806
 807                         if (strcmp(curr_map->dso->short_name, module)) {
 808                                 if (curr_map != initial_map &&
 809                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 810                                     machine__is_default_guest(machine)) {
 811                                         /*
 812                                          * We assume all symbols of a module are
 813                                          * continuous in * kallsyms, so curr_map
 814                                          * points to a module and all its
 815                                          * symbols are in its kmap. Mark it as
 816                                          * loaded.
 817                                          */
 818                                         dso__set_loaded(curr_map->dso);
 819                                 }
 820
 821                                 curr_map = maps__find_by_name(kmaps, module);
 822                                 if (curr_map == NULL) {
 823                                         pr_debug("%s/proc/{kallsyms,modules} "
 824                                                  "inconsistency while looking "
 825                                                  "for \"%s\" module!\n",
 826                                                  machine->root_dir, module);
 827                                         curr_map = initial_map;
 828                                         goto discard_symbol;
 829                                 }
 830
 831                                 if (curr_map->dso->loaded &&
 832                                     !machine__is_default_guest(machine))
 833                                         goto discard_symbol;
 834                         }
 835                         /*
 836                          * So that we look just like we get from .ko files,
 837                          * i.e. not prelinked, relative to initial_map->start.
 838                          */
 839                         pos->start = curr_map->map_ip(curr_map, pos->start);
 840                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 841                 } else if (x86_64 && is_entry_trampoline(pos->name)) {
 842                         /*
 843                          * These symbols are not needed anymore since the
 844                          * trampoline maps refer to the text section and it's
 845                          * symbols instead. Avoid having to deal with
 846                          * relocations, and the assumption that the first symbol
 847                          * is the start of kernel text, by simply removing the
 848                          * symbols at this point.
 849                          */
 850                         goto discard_symbol;
 851                 } else if (curr_map != initial_map) {
 852                         char dso_name[PATH_MAX];
 853                         struct dso *ndso;
 854
 855                         if (delta) {
 856                                 /* Kernel was relocated at boot time */
 857                                 pos->start -= delta;
 858                                 pos->end -= delta;
 859                         }
 860
 861                         if (count == 0) {
 862                                 curr_map = initial_map;
 863                                 goto add_symbol;
 864                         }
 865
 866                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 867                                 snprintf(dso_name, sizeof(dso_name),
 868                                         "[guest.kernel].%d",
 869                                         kernel_range++);
 870                         else
 871                                 snprintf(dso_name, sizeof(dso_name),
 872                                         "[kernel].%d",
 873                                         kernel_range++);
 874
 875                         ndso = dso__new(dso_name);
 876                         if (ndso == NULL)
 877                                 return -1;
 878
 879                         ndso->kernel = dso->kernel;
 880
 881                         curr_map = map__new2(pos->start, ndso);
 882                         if (curr_map == NULL) {
 883                                 dso__put(ndso);
 884                                 return -1;
 885                         }
 886
 887                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 888                         maps__insert(kmaps, curr_map);
 889                         ++kernel_range;
 890                 } else if (delta) {
 891                         /* Kernel was relocated at boot time */
 892                         pos->start -= delta;
 893                         pos->end -= delta;
 894                 }
 895 add_symbol:
 896                 if (curr_map != initial_map) {
 897                         rb_erase_cached(&pos->rb_node, root);
 898                         symbols__insert(&curr_map->dso->symbols, pos);
 899                         ++moved;
 900                 } else
 901                         ++count;
 902
 903                 continue;
 904 discard_symbol:
 905                 rb_erase_cached(&pos->rb_node, root);
 906                 symbol__delete(pos);
 907         }
 908
 909         if (curr_map != initial_map &&
 910             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 911             machine__is_default_guest(kmaps->machine)) {
 912                 dso__set_loaded(curr_map->dso);
 913         }
 914
 915         return count + moved;
 916 }
 917
 918 bool symbol__restricted_filename(const char *filename,
 919                                  const char *restricted_filename)
 920 {
 921         bool restricted = false;
 922
 923         if (symbol_conf.kptr_restrict) {
 924                 char *r = realpath(filename, NULL);
 925
 926                 if (r != NULL) {
 927                         restricted = strcmp(r, restricted_filename) == 0;
 928                         free(r);
 929                         return restricted;
 930                 }
 931         }
 932
 933         return restricted;
 934 }
 935
 936 struct module_info {
 937         struct rb_node rb_node;
 938         char *name;
 939         u64 start;
 940 };
 941
 942 static void add_module(struct module_info *mi, struct rb_root *modules)
 943 {
 944         struct rb_node **p = &modules->rb_node;
 945         struct rb_node *parent = NULL;
 946         struct module_info *m;
 947
 948         while (*p != NULL) {
 949                 parent = *p;
 950                 m = rb_entry(parent, struct module_info, rb_node);
 951                 if (strcmp(mi->name, m->name) < 0)
 952                         p = &(*p)->rb_left;
 953                 else
 954                         p = &(*p)->rb_right;
 955         }
 956         rb_link_node(&mi->rb_node, parent, p);
 957         rb_insert_color(&mi->rb_node, modules);
 958 }
 959
 960 static void delete_modules(struct rb_root *modules)
 961 {
 962         struct module_info *mi;
 963         struct rb_node *next = rb_first(modules);
 964
 965         while (next) {
 966                 mi = rb_entry(next, struct module_info, rb_node);
 967                 next = rb_next(&mi->rb_node);
 968                 rb_erase(&mi->rb_node, modules);
 969                 zfree(&mi->name);
 970                 free(mi);
 971         }
 972 }
 973
 974 static struct module_info *find_module(const char *name,
 975                                        struct rb_root *modules)
 976 {
 977         struct rb_node *n = modules->rb_node;
 978
 979         while (n) {
 980                 struct module_info *m;
 981                 int cmp;
 982
 983                 m = rb_entry(n, struct module_info, rb_node);
 984                 cmp = strcmp(name, m->name);
 985                 if (cmp < 0)
 986                         n = n->rb_left;
 987                 else if (cmp > 0)
 988                         n = n->rb_right;
 989                 else
 990                         return m;
 991         }
 992
 993         return NULL;
 994 }
 995
 996 static int __read_proc_modules(void *arg, const char *name, u64 start,
 997                                u64 size __maybe_unused)
 998 {
 999         struct rb_root *modules = arg;
1000         struct module_info *mi;
1001
1002         mi = zalloc(sizeof(struct module_info));
1003         if (!mi)
1004                 return -ENOMEM;
1005
1006         mi->name = strdup(name);
1007         mi->start = start;
1008
1009         if (!mi->name) {
1010                 free(mi);
1011                 return -ENOMEM;
1012         }
1013
1014         add_module(mi, modules);
1015
1016         return 0;
1017 }
1018
1019 static int read_proc_modules(const char *filename, struct rb_root *modules)
1020 {
1021         if (symbol__restricted_filename(filename, "/proc/modules"))
1022                 return -1;
1023
1024         if (modules__parse(filename, modules, __read_proc_modules)) {
1025                 delete_modules(modules);
1026                 return -1;
1027         }
1028
1029         return 0;
1030 }
1031
1032 int compare_proc_modules(const char *from, const char *to)
1033 {
1034         struct rb_root from_modules = RB_ROOT;
1035         struct rb_root to_modules = RB_ROOT;
1036         struct rb_node *from_node, *to_node;
1037         struct module_info *from_m, *to_m;
1038         int ret = -1;
1039
1040         if (read_proc_modules(from, &from_modules))
1041                 return -1;
1042
1043         if (read_proc_modules(to, &to_modules))
1044                 goto out_delete_from;
1045
1046         from_node = rb_first(&from_modules);
1047         to_node = rb_first(&to_modules);
1048         while (from_node) {
1049                 if (!to_node)
1050                         break;
1051
1052                 from_m = rb_entry(from_node, struct module_info, rb_node);
1053                 to_m = rb_entry(to_node, struct module_info, rb_node);
1054
1055                 if (from_m->start != to_m->start ||
1056                     strcmp(from_m->name, to_m->name))
1057                         break;
1058
1059                 from_node = rb_next(from_node);
1060                 to_node = rb_next(to_node);
1061         }
1062
1063         if (!from_node && !to_node)
1064                 ret = 0;
1065
1066         delete_modules(&to_modules);
1067 out_delete_from:
1068         delete_modules(&from_modules);
1069
1070         return ret;
1071 }
1072
1073 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1074 {
1075         struct rb_root modules = RB_ROOT;
1076         struct map *old_map;
1077         int err;
1078
1079         err = read_proc_modules(filename, &modules);
1080         if (err)
1081                 return err;
1082
1083         maps__for_each_entry(kmaps, old_map) {
1084                 struct module_info *mi;
1085
1086                 if (!__map__is_kmodule(old_map)) {
1087                         continue;
1088                 }
1089
1090                 /* Module must be in memory at the same address */
1091                 mi = find_module(old_map->dso->short_name, &modules);
1092                 if (!mi || mi->start != old_map->start) {
1093                         err = -EINVAL;
1094                         goto out;
1095                 }
1096         }
1097 out:
1098         delete_modules(&modules);
1099         return err;
1100 }
1101
1102 /*
1103  * If kallsyms is referenced by name then we look for filename in the same
1104  * directory.
1105  */
1106 static bool filename_from_kallsyms_filename(char *filename,
1107                                             const char *base_name,
1108                                             const char *kallsyms_filename)
1109 {
1110         char *name;
1111
1112         strcpy(filename, kallsyms_filename);
1113         name = strrchr(filename, '/');
1114         if (!name)
1115                 return false;
1116
1117         name += 1;
1118
1119         if (!strcmp(name, "kallsyms")) {
1120                 strcpy(name, base_name);
1121                 return true;
1122         }
1123
1124         return false;
1125 }
1126
1127 static int validate_kcore_modules(const char *kallsyms_filename,
1128                                   struct map *map)
1129 {
1130         struct maps *kmaps = map__kmaps(map);
1131         char modules_filename[PATH_MAX];
1132
1133         if (!kmaps)
1134                 return -EINVAL;
1135
1136         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1137                                              kallsyms_filename))
1138                 return -EINVAL;
1139
1140         if (do_validate_kcore_modules(modules_filename, kmaps))
1141                 return -EINVAL;
1142
1143         return 0;
1144 }
1145
1146 static int validate_kcore_addresses(const char *kallsyms_filename,
1147                                     struct map *map)
1148 {
1149         struct kmap *kmap = map__kmap(map);
1150
1151         if (!kmap)
1152                 return -EINVAL;
1153
1154         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1155                 u64 start;
1156
1157                 if (kallsyms__get_function_start(kallsyms_filename,
1158                                                  kmap->ref_reloc_sym->name, &start))
1159                         return -ENOENT;
1160                 if (start != kmap->ref_reloc_sym->addr)
1161                         return -EINVAL;
1162         }
1163
1164         return validate_kcore_modules(kallsyms_filename, map);
1165 }
1166
1167 struct kcore_mapfn_data {
1168         struct dso *dso;
1169         struct list_head maps;
1170 };
1171
1172 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1173 {
1174         struct kcore_mapfn_data *md = data;
1175         struct map *map;
1176
1177         map = map__new2(start, md->dso);
1178         if (map == NULL)
1179                 return -ENOMEM;
1180
1181         map->end = map->start + len;
1182         map->pgoff = pgoff;
1183
1184         list_add(&map->node, &md->maps);
1185
1186         return 0;
1187 }
1188
1189 /*
1190  * Merges map into maps by splitting the new map within the existing map
1191  * regions.
1192  */
1193 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1194 {
1195         struct map *old_map;
1196         LIST_HEAD(merged);
1197
1198         maps__for_each_entry(kmaps, old_map) {
1199                 /* no overload with this one */
1200                 if (new_map->end < old_map->start ||
1201                     new_map->start >= old_map->end)
1202                         continue;
1203
1204                 if (new_map->start < old_map->start) {
1205                         /*
1206                          * |new......
1207                          *       |old....
1208                          */
1209                         if (new_map->end < old_map->end) {
1210                                 /*
1211                                  * |new......|     -> |new..|
1212                                  *       |old....| ->       |old....|
1213                                  */
1214                                 new_map->end = old_map->start;
1215                         } else {
1216                                 /*
1217                                  * |new.............| -> |new..|       |new..|
1218                                  *       |old....|    ->       |old....|
1219                                  */
1220                                 struct map *m = map__clone(new_map);
1221
1222                                 if (!m)
1223                                         return -ENOMEM;
1224
1225                                 m->end = old_map->start;
1226                                 list_add_tail(&m->node, &merged);
1227                                 new_map->pgoff += old_map->end - new_map->start;
1228                                 new_map->start = old_map->end;
1229                         }
1230                 } else {
1231                         /*
1232                          *      |new......
1233                          * |old....
1234                          */
1235                         if (new_map->end < old_map->end) {
1236                                 /*
1237                                  *      |new..|   -> x
1238                                  * |old.........| -> |old.........|
1239                                  */
1240                                 map__put(new_map);
1241                                 new_map = NULL;
1242                                 break;
1243                         } else {
1244                                 /*
1245                                  *      |new......| ->         |new...|
1246                                  * |old....|        -> |old....|
1247                                  */
1248                                 new_map->pgoff += old_map->end - new_map->start;
1249                                 new_map->start = old_map->end;
1250                         }
1251                 }
1252         }
1253
1254         while (!list_empty(&merged)) {
1255                 old_map = list_entry(merged.next, struct map, node);
1256                 list_del_init(&old_map->node);
1257                 maps__insert(kmaps, old_map);
1258                 map__put(old_map);
1259         }
1260
1261         if (new_map) {
1262                 maps__insert(kmaps, new_map);
1263                 map__put(new_map);
1264         }
1265         return 0;
1266 }
1267
1268 static int dso__load_kcore(struct dso *dso, struct map *map,
1269                            const char *kallsyms_filename)
1270 {
1271         struct maps *kmaps = map__kmaps(map);
1272         struct kcore_mapfn_data md;
1273         struct map *old_map, *new_map, *replacement_map = NULL, *next;
1274         struct machine *machine;
1275         bool is_64_bit;
1276         int err, fd;
1277         char kcore_filename[PATH_MAX];
1278         u64 stext;
1279
1280         if (!kmaps)
1281                 return -EINVAL;
1282
1283         machine = kmaps->machine;
1284
1285         /* This function requires that the map is the kernel map */
1286         if (!__map__is_kernel(map))
1287                 return -EINVAL;
1288
1289         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1290                                              kallsyms_filename))
1291                 return -EINVAL;
1292
1293         /* Modules and kernel must be present at their original addresses */
1294         if (validate_kcore_addresses(kallsyms_filename, map))
1295                 return -EINVAL;
1296
1297         md.dso = dso;
1298         INIT_LIST_HEAD(&md.maps);
1299
1300         fd = open(kcore_filename, O_RDONLY);
1301         if (fd < 0) {
1302                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1303                          kcore_filename);
1304                 return -EINVAL;
1305         }
1306
1307         /* Read new maps into temporary lists */
1308         err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1309                               &is_64_bit);
1310         if (err)
1311                 goto out_err;
1312         dso->is_64_bit = is_64_bit;
1313
1314         if (list_empty(&md.maps)) {
1315                 err = -EINVAL;
1316                 goto out_err;
1317         }
1318
1319         /* Remove old maps */
1320         maps__for_each_entry_safe(kmaps, old_map, next) {
1321                 /*
1322                  * We need to preserve eBPF maps even if they are
1323                  * covered by kcore, because we need to access
1324                  * eBPF dso for source data.
1325                  */
1326                 if (old_map != map && !__map__is_bpf_prog(old_map))
1327                         maps__remove(kmaps, old_map);
1328         }
1329         machine->trampolines_mapped = false;
1330
1331         /* Find the kernel map using the '_stext' symbol */
1332         if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1333                 list_for_each_entry(new_map, &md.maps, node) {
1334                         if (stext >= new_map->start && stext < new_map->end) {
1335                                 replacement_map = new_map;
1336                                 break;
1337                         }
1338                 }
1339         }
1340
1341         if (!replacement_map)
1342                 replacement_map = list_entry(md.maps.next, struct map, node);
1343
1344         /* Add new maps */
1345         while (!list_empty(&md.maps)) {
1346                 new_map = list_entry(md.maps.next, struct map, node);
1347                 list_del_init(&new_map->node);
1348                 if (new_map == replacement_map) {
1349                         map->start      = new_map->start;
1350                         map->end        = new_map->end;
1351                         map->pgoff      = new_map->pgoff;
1352                         map->map_ip     = new_map->map_ip;
1353                         map->unmap_ip   = new_map->unmap_ip;
1354                         /* Ensure maps are correctly ordered */
1355                         map__get(map);
1356                         maps__remove(kmaps, map);
1357                         maps__insert(kmaps, map);
1358                         map__put(map);
1359                         map__put(new_map);
1360                 } else {
1361                         /*
1362                          * Merge kcore map into existing maps,
1363                          * and ensure that current maps (eBPF)
1364                          * stay intact.
1365                          */
1366                         if (maps__merge_in(kmaps, new_map))
1367                                 goto out_err;
1368                 }
1369         }
1370
1371         if (machine__is(machine, "x86_64")) {
1372                 u64 addr;
1373
1374                 /*
1375                  * If one of the corresponding symbols is there, assume the
1376                  * entry trampoline maps are too.
1377                  */
1378                 if (!kallsyms__get_function_start(kallsyms_filename,
1379                                                   ENTRY_TRAMPOLINE_NAME,
1380                                                   &addr))
1381                         machine->trampolines_mapped = true;
1382         }
1383
1384         /*
1385          * Set the data type and long name so that kcore can be read via
1386          * dso__data_read_addr().
1387          */
1388         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1389                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1390         else
1391                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1392         dso__set_long_name(dso, strdup(kcore_filename), true);
1393
1394         close(fd);
1395
1396         if (map->prot & PROT_EXEC)
1397                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1398         else
1399                 pr_debug("Using %s for kernel data\n", kcore_filename);
1400
1401         return 0;
1402
1403 out_err:
1404         while (!list_empty(&md.maps)) {
1405                 map = list_entry(md.maps.next, struct map, node);
1406                 list_del_init(&map->node);
1407                 map__put(map);
1408         }
1409         close(fd);
1410         return -EINVAL;
1411 }
1412
1413 /*
1414  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1415  * delta based on the relocation reference symbol.
1416  */
1417 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1418 {
1419         u64 addr;
1420
1421         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1422                 return 0;
1423
1424         if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1425                 return -1;
1426
1427         *delta = addr - kmap->ref_reloc_sym->addr;
1428         return 0;
1429 }
1430
1431 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1432                          struct map *map, bool no_kcore)
1433 {
1434         struct kmap *kmap = map__kmap(map);
1435         u64 delta = 0;
1436
1437         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1438                 return -1;
1439
1440         if (!kmap || !kmap->kmaps)
1441                 return -1;
1442
1443         if (dso__load_all_kallsyms(dso, filename) < 0)
1444                 return -1;
1445
1446         if (kallsyms__delta(kmap, filename, &delta))
1447                 return -1;
1448
1449         symbols__fixup_end(&dso->symbols);
1450         symbols__fixup_duplicate(&dso->symbols);
1451
1452         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1453                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1454         else
1455                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1456
1457         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1458                 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1459         else
1460                 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1461 }
1462
1463 int dso__load_kallsyms(struct dso *dso, const char *filename,
1464                        struct map *map)
1465 {
1466         return __dso__load_kallsyms(dso, filename, map, false);
1467 }
1468
1469 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1470 {
1471         char *line = NULL;
1472         size_t n;
1473         FILE *file;
1474         int nr_syms = 0;
1475
1476         file = fopen(map_path, "r");
1477         if (file == NULL)
1478                 goto out_failure;
1479
1480         while (!feof(file)) {
1481                 u64 start, size;
1482                 struct symbol *sym;
1483                 int line_len, len;
1484
1485                 line_len = getline(&line, &n, file);
1486                 if (line_len < 0)
1487                         break;
1488
1489                 if (!line)
1490                         goto out_failure;
1491
1492                 line[--line_len] = '\0'; /* \n */
1493
1494                 len = hex2u64(line, &start);
1495
1496                 len++;
1497                 if (len + 2 >= line_len)
1498                         continue;
1499
1500                 len += hex2u64(line + len, &size);
1501
1502                 len++;
1503                 if (len + 2 >= line_len)
1504                         continue;
1505
1506                 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1507
1508                 if (sym == NULL)
1509                         goto out_delete_line;
1510
1511                 symbols__insert(&dso->symbols, sym);
1512                 nr_syms++;
1513         }
1514
1515         free(line);
1516         fclose(file);
1517
1518         return nr_syms;
1519
1520 out_delete_line:
1521         free(line);
1522 out_failure:
1523         return -1;
1524 }
1525
1526 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1527                                            enum dso_binary_type type)
1528 {
1529         switch (type) {
1530         case DSO_BINARY_TYPE__JAVA_JIT:
1531         case DSO_BINARY_TYPE__DEBUGLINK:
1532         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1533         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1534         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1535         case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1536         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1537         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1538                 return !kmod && dso->kernel == DSO_TYPE_USER;
1539
1540         case DSO_BINARY_TYPE__KALLSYMS:
1541         case DSO_BINARY_TYPE__VMLINUX:
1542         case DSO_BINARY_TYPE__KCORE:
1543                 return dso->kernel == DSO_TYPE_KERNEL;
1544
1545         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1546         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1547         case DSO_BINARY_TYPE__GUEST_KCORE:
1548                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1549
1550         case DSO_BINARY_TYPE__GUEST_KMODULE:
1551         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1552         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1553         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1554                 /*
1555                  * kernel modules know their symtab type - it's set when
1556                  * creating a module dso in machine__addnew_module_map().
1557                  */
1558                 return kmod && dso->symtab_type == type;
1559
1560         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1561         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1562                 return true;
1563
1564         case DSO_BINARY_TYPE__BPF_PROG_INFO:
1565         case DSO_BINARY_TYPE__BPF_IMAGE:
1566         case DSO_BINARY_TYPE__NOT_FOUND:
1567         default:
1568                 return false;
1569         }
1570 }
1571
1572 /* Checks for the existence of the perf-<pid>.map file in two different
1573  * locations.  First, if the process is a separate mount namespace, check in
1574  * that namespace using the pid of the innermost pid namespace.  If's not in a
1575  * namespace, or the file can't be found there, try in the mount namespace of
1576  * the tracing process using our view of its pid.
1577  */
1578 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1579                               struct nsinfo **nsip)
1580 {
1581         struct nscookie nsc;
1582         struct nsinfo *nsi;
1583         struct nsinfo *nnsi;
1584         int rc = -1;
1585
1586         nsi = *nsip;
1587
1588         if (nsi->need_setns) {
1589                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1590                 nsinfo__mountns_enter(nsi, &nsc);
1591                 rc = access(filebuf, R_OK);
1592                 nsinfo__mountns_exit(&nsc);
1593                 if (rc == 0)
1594                         return rc;
1595         }
1596
1597         nnsi = nsinfo__copy(nsi);
1598         if (nnsi) {
1599                 nsinfo__put(nsi);
1600
1601                 nnsi->need_setns = false;
1602                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1603                 *nsip = nnsi;
1604                 rc = 0;
1605         }
1606
1607         return rc;
1608 }
1609
1610 int dso__load(struct dso *dso, struct map *map)
1611 {
1612         char *name;
1613         int ret = -1;
1614         u_int i;
1615         struct machine *machine = NULL;
1616         char *root_dir = (char *) "";
1617         int ss_pos = 0;
1618         struct symsrc ss_[2];
1619         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1620         bool kmod;
1621         bool perfmap;
1622         unsigned char build_id[BUILD_ID_SIZE];
1623         struct nscookie nsc;
1624         char newmapname[PATH_MAX];
1625         const char *map_path = dso->long_name;
1626
1627         perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1628         if (perfmap) {
1629                 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1630                     sizeof(newmapname), &dso->nsinfo) == 0)) {
1631                         map_path = newmapname;
1632                 }
1633         }
1634
1635         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1636         pthread_mutex_lock(&dso->lock);
1637
1638         /* check again under the dso->lock */
1639         if (dso__loaded(dso)) {
1640                 ret = 1;
1641                 goto out;
1642         }
1643
1644         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1645                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1646                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1647                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1648
1649         if (dso->kernel && !kmod) {
1650                 if (dso->kernel == DSO_TYPE_KERNEL)
1651                         ret = dso__load_kernel_sym(dso, map);
1652                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1653                         ret = dso__load_guest_kernel_sym(dso, map);
1654
1655                 machine = map__kmaps(map)->machine;
1656                 if (machine__is(machine, "x86_64"))
1657                         machine__map_x86_64_entry_trampolines(machine, dso);
1658                 goto out;
1659         }
1660
1661         dso->adjust_symbols = 0;
1662
1663         if (perfmap) {
1664                 ret = dso__load_perf_map(map_path, dso);
1665                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1666                                              DSO_BINARY_TYPE__NOT_FOUND;
1667                 goto out;
1668         }
1669
1670         if (machine)
1671                 root_dir = machine->root_dir;
1672
1673         name = malloc(PATH_MAX);
1674         if (!name)
1675                 goto out;
1676
1677         /*
1678          * Read the build id if possible. This is required for
1679          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1680          */
1681         if (!dso->has_build_id &&
1682             is_regular_file(dso->long_name)) {
1683             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1684             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1685                 dso__set_build_id(dso, build_id);
1686         }
1687
1688         /*
1689          * Iterate over candidate debug images.
1690          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1691          * and/or opd section) for processing.
1692          */
1693         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1694                 struct symsrc *ss = &ss_[ss_pos];
1695                 bool next_slot = false;
1696                 bool is_reg;
1697                 bool nsexit;
1698                 int sirc = -1;
1699
1700                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1701
1702                 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1703                     symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1704
1705                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1706                         continue;
1707
1708                 if (dso__read_binary_type_filename(dso, symtab_type,
1709                                                    root_dir, name, PATH_MAX))
1710                         continue;
1711
1712                 if (nsexit)
1713                         nsinfo__mountns_exit(&nsc);
1714
1715                 is_reg = is_regular_file(name);
1716                 if (is_reg)
1717                         sirc = symsrc__init(ss, dso, name, symtab_type);
1718
1719                 if (nsexit)
1720                         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1721
1722                 if (!is_reg || sirc < 0)
1723                         continue;
1724
1725                 if (!syms_ss && symsrc__has_symtab(ss)) {
1726                         syms_ss = ss;
1727                         next_slot = true;
1728                         if (!dso->symsrc_filename)
1729                                 dso->symsrc_filename = strdup(name);
1730                 }
1731
1732                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1733                         runtime_ss = ss;
1734                         next_slot = true;
1735                 }
1736
1737                 if (next_slot) {
1738                         ss_pos++;
1739
1740                         if (syms_ss && runtime_ss)
1741                                 break;
1742                 } else {
1743                         symsrc__destroy(ss);
1744                 }
1745
1746         }
1747
1748         if (!runtime_ss && !syms_ss)
1749                 goto out_free;
1750
1751         if (runtime_ss && !syms_ss) {
1752                 syms_ss = runtime_ss;
1753         }
1754
1755         /* We'll have to hope for the best */
1756         if (!runtime_ss && syms_ss)
1757                 runtime_ss = syms_ss;
1758
1759         if (syms_ss)
1760                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1761         else
1762                 ret = -1;
1763
1764         if (ret > 0) {
1765                 int nr_plt;
1766
1767                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1768                 if (nr_plt > 0)
1769                         ret += nr_plt;
1770         }
1771
1772         for (; ss_pos > 0; ss_pos--)
1773                 symsrc__destroy(&ss_[ss_pos - 1]);
1774 out_free:
1775         free(name);
1776         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1777                 ret = 0;
1778 out:
1779         dso__set_loaded(dso);
1780         pthread_mutex_unlock(&dso->lock);
1781         nsinfo__mountns_exit(&nsc);
1782
1783         return ret;
1784 }
1785
1786 static int map__strcmp(const void *a, const void *b)
1787 {
1788         const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1789         return strcmp(ma->dso->short_name, mb->dso->short_name);
1790 }
1791
1792 static int map__strcmp_name(const void *name, const void *b)
1793 {
1794         const struct map *map = *(const struct map **)b;
1795         return strcmp(name, map->dso->short_name);
1796 }
1797
1798 void __maps__sort_by_name(struct maps *maps)
1799 {
1800         qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1801 }
1802
1803 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1804 {
1805         struct map *map;
1806         struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1807         int i = 0;
1808
1809         if (maps_by_name == NULL)
1810                 return -1;
1811
1812         maps->maps_by_name = maps_by_name;
1813         maps->nr_maps_allocated = maps->nr_maps;
1814
1815         maps__for_each_entry(maps, map)
1816                 maps_by_name[i++] = map;
1817
1818         __maps__sort_by_name(maps);
1819         return 0;
1820 }
1821
1822 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1823 {
1824         struct map **mapp;
1825
1826         if (maps->maps_by_name == NULL &&
1827             map__groups__sort_by_name_from_rbtree(maps))
1828                 return NULL;
1829
1830         mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1831         if (mapp)
1832                 return *mapp;
1833         return NULL;
1834 }
1835
1836 struct map *maps__find_by_name(struct maps *maps, const char *name)
1837 {
1838         struct map *map;
1839
1840         down_read(&maps->lock);
1841
1842         if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1843                 map = maps->last_search_by_name;
1844                 goto out_unlock;
1845         }
1846         /*
1847          * If we have maps->maps_by_name, then the name isn't in the rbtree,
1848          * as maps->maps_by_name mirrors the rbtree when lookups by name are
1849          * made.
1850          */
1851         map = __maps__find_by_name(maps, name);
1852         if (map || maps->maps_by_name != NULL)
1853                 goto out_unlock;
1854
1855         /* Fallback to traversing the rbtree... */
1856         maps__for_each_entry(maps, map)
1857                 if (strcmp(map->dso->short_name, name) == 0) {
1858                         maps->last_search_by_name = map;
1859                         goto out_unlock;
1860                 }
1861
1862         map = NULL;
1863
1864 out_unlock:
1865         up_read(&maps->lock);
1866         return map;
1867 }
1868
1869 int dso__load_vmlinux(struct dso *dso, struct map *map,
1870                       const char *vmlinux, bool vmlinux_allocated)
1871 {
1872         int err = -1;
1873         struct symsrc ss;
1874         char symfs_vmlinux[PATH_MAX];
1875         enum dso_binary_type symtab_type;
1876
1877         if (vmlinux[0] == '/')
1878                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1879         else
1880                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1881
1882         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1883                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1884         else
1885                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1886
1887         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1888                 return -1;
1889
1890         err = dso__load_sym(dso, map, &ss, &ss, 0);
1891         symsrc__destroy(&ss);
1892
1893         if (err > 0) {
1894                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1895                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1896                 else
1897                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1898                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1899                 dso__set_loaded(dso);
1900                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1901         }
1902
1903         return err;
1904 }
1905
1906 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1907 {
1908         int i, err = 0;
1909         char *filename = NULL;
1910
1911         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1912                  vmlinux_path__nr_entries + 1);
1913
1914         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1915                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1916                 if (err > 0)
1917                         goto out;
1918         }
1919
1920         if (!symbol_conf.ignore_vmlinux_buildid)
1921                 filename = dso__build_id_filename(dso, NULL, 0, false);
1922         if (filename != NULL) {
1923                 err = dso__load_vmlinux(dso, map, filename, true);
1924                 if (err > 0)
1925                         goto out;
1926                 free(filename);
1927         }
1928 out:
1929         return err;
1930 }
1931
1932 static bool visible_dir_filter(const char *name, struct dirent *d)
1933 {
1934         if (d->d_type != DT_DIR)
1935                 return false;
1936         return lsdir_no_dot_filter(name, d);
1937 }
1938
1939 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1940 {
1941         char kallsyms_filename[PATH_MAX];
1942         int ret = -1;
1943         struct strlist *dirs;
1944         struct str_node *nd;
1945
1946         dirs = lsdir(dir, visible_dir_filter);
1947         if (!dirs)
1948                 return -1;
1949
1950         strlist__for_each_entry(nd, dirs) {
1951                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1952                           "%s/%s/kallsyms", dir, nd->s);
1953                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1954                         strlcpy(dir, kallsyms_filename, dir_sz);
1955                         ret = 0;
1956                         break;
1957                 }
1958         }
1959
1960         strlist__delete(dirs);
1961
1962         return ret;
1963 }
1964
1965 /*
1966  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1967  * since access(R_OK) only checks with real UID/GID but open() use effective
1968  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1969  */
1970 static bool filename__readable(const char *file)
1971 {
1972         int fd = open(file, O_RDONLY);
1973         if (fd < 0)
1974                 return false;
1975         close(fd);
1976         return true;
1977 }
1978
1979 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1980 {
1981         u8 host_build_id[BUILD_ID_SIZE];
1982         char sbuild_id[SBUILD_ID_SIZE];
1983         bool is_host = false;
1984         char path[PATH_MAX];
1985
1986         if (!dso->has_build_id) {
1987                 /*
1988                  * Last resort, if we don't have a build-id and couldn't find
1989                  * any vmlinux file, try the running kernel kallsyms table.
1990                  */
1991                 goto proc_kallsyms;
1992         }
1993
1994         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1995                                  sizeof(host_build_id)) == 0)
1996                 is_host = dso__build_id_equal(dso, host_build_id);
1997
1998         /* Try a fast path for /proc/kallsyms if possible */
1999         if (is_host) {
2000                 /*
2001                  * Do not check the build-id cache, unless we know we cannot use
2002                  * /proc/kcore or module maps don't match to /proc/kallsyms.
2003                  * To check readability of /proc/kcore, do not use access(R_OK)
2004                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
2005                  * can't check it.
2006                  */
2007                 if (filename__readable("/proc/kcore") &&
2008                     !validate_kcore_addresses("/proc/kallsyms", map))
2009                         goto proc_kallsyms;
2010         }
2011
2012         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
2013
2014         /* Find kallsyms in build-id cache with kcore */
2015         scnprintf(path, sizeof(path), "%s/%s/%s",
2016                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
2017
2018         if (!find_matching_kcore(map, path, sizeof(path)))
2019                 return strdup(path);
2020
2021         /* Use current /proc/kallsyms if possible */
2022         if (is_host) {
2023 proc_kallsyms:
2024                 return strdup("/proc/kallsyms");
2025         }
2026
2027         /* Finally, find a cache of kallsyms */
2028         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2029                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2030                        sbuild_id);
2031                 return NULL;
2032         }
2033
2034         return strdup(path);
2035 }
2036
2037 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2038 {
2039         int err;
2040         const char *kallsyms_filename = NULL;
2041         char *kallsyms_allocated_filename = NULL;
2042         /*
2043          * Step 1: if the user specified a kallsyms or vmlinux filename, use
2044          * it and only it, reporting errors to the user if it cannot be used.
2045          *
2046          * For instance, try to analyse an ARM perf.data file _without_ a
2047          * build-id, or if the user specifies the wrong path to the right
2048          * vmlinux file, obviously we can't fallback to another vmlinux (a
2049          * x86_86 one, on the machine where analysis is being performed, say),
2050          * or worse, /proc/kallsyms.
2051          *
2052          * If the specified file _has_ a build-id and there is a build-id
2053          * section in the perf.data file, we will still do the expected
2054          * validation in dso__load_vmlinux and will bail out if they don't
2055          * match.
2056          */
2057         if (symbol_conf.kallsyms_name != NULL) {
2058                 kallsyms_filename = symbol_conf.kallsyms_name;
2059                 goto do_kallsyms;
2060         }
2061
2062         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2063                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2064         }
2065
2066         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2067                 err = dso__load_vmlinux_path(dso, map);
2068                 if (err > 0)
2069                         return err;
2070         }
2071
2072         /* do not try local files if a symfs was given */
2073         if (symbol_conf.symfs[0] != 0)
2074                 return -1;
2075
2076         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2077         if (!kallsyms_allocated_filename)
2078                 return -1;
2079
2080         kallsyms_filename = kallsyms_allocated_filename;
2081
2082 do_kallsyms:
2083         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2084         if (err > 0)
2085                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2086         free(kallsyms_allocated_filename);
2087
2088         if (err > 0 && !dso__is_kcore(dso)) {
2089                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2090                 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2091                 map__fixup_start(map);
2092                 map__fixup_end(map);
2093         }
2094
2095         return err;
2096 }
2097
2098 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2099 {
2100         int err;
2101         const char *kallsyms_filename = NULL;
2102         struct machine *machine = map__kmaps(map)->machine;
2103         char path[PATH_MAX];
2104
2105         if (machine__is_default_guest(machine)) {
2106                 /*
2107                  * if the user specified a vmlinux filename, use it and only
2108                  * it, reporting errors to the user if it cannot be used.
2109                  * Or use file guest_kallsyms inputted by user on commandline
2110                  */
2111                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2112                         err = dso__load_vmlinux(dso, map,
2113                                                 symbol_conf.default_guest_vmlinux_name,
2114                                                 false);
2115                         return err;
2116                 }
2117
2118                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2119                 if (!kallsyms_filename)
2120                         return -1;
2121         } else {
2122                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2123                 kallsyms_filename = path;
2124         }
2125
2126         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2127         if (err > 0)
2128                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2129         if (err > 0 && !dso__is_kcore(dso)) {
2130                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2131                 dso__set_long_name(dso, machine->mmap_name, false);
2132                 map__fixup_start(map);
2133                 map__fixup_end(map);
2134         }
2135
2136         return err;
2137 }
2138
2139 static void vmlinux_path__exit(void)
2140 {
2141         while (--vmlinux_path__nr_entries >= 0)
2142                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2143         vmlinux_path__nr_entries = 0;
2144
2145         zfree(&vmlinux_path);
2146 }
2147
2148 static const char * const vmlinux_paths[] = {
2149         "vmlinux",
2150         "/boot/vmlinux"
2151 };
2152
2153 static const char * const vmlinux_paths_upd[] = {
2154         "/boot/vmlinux-%s",
2155         "/usr/lib/debug/boot/vmlinux-%s",
2156         "/lib/modules/%s/build/vmlinux",
2157         "/usr/lib/debug/lib/modules/%s/vmlinux",
2158         "/usr/lib/debug/boot/vmlinux-%s.debug"
2159 };
2160
2161 static int vmlinux_path__add(const char *new_entry)
2162 {
2163         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2164         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2165                 return -1;
2166         ++vmlinux_path__nr_entries;
2167
2168         return 0;
2169 }
2170
2171 static int vmlinux_path__init(struct perf_env *env)
2172 {
2173         struct utsname uts;
2174         char bf[PATH_MAX];
2175         char *kernel_version;
2176         unsigned int i;
2177
2178         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2179                               ARRAY_SIZE(vmlinux_paths_upd)));
2180         if (vmlinux_path == NULL)
2181                 return -1;
2182
2183         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2184                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2185                         goto out_fail;
2186
2187         /* only try kernel version if no symfs was given */
2188         if (symbol_conf.symfs[0] != 0)
2189                 return 0;
2190
2191         if (env) {
2192                 kernel_version = env->os_release;
2193         } else {
2194                 if (uname(&uts) < 0)
2195                         goto out_fail;
2196
2197                 kernel_version = uts.release;
2198         }
2199
2200         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2201                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2202                 if (vmlinux_path__add(bf) < 0)
2203                         goto out_fail;
2204         }
2205
2206         return 0;
2207
2208 out_fail:
2209         vmlinux_path__exit();
2210         return -1;
2211 }
2212
2213 int setup_list(struct strlist **list, const char *list_str,
2214                       const char *list_name)
2215 {
2216         if (list_str == NULL)
2217                 return 0;
2218
2219         *list = strlist__new(list_str, NULL);
2220         if (!*list) {
2221                 pr_err("problems parsing %s list\n", list_name);
2222                 return -1;
2223         }
2224
2225         symbol_conf.has_filter = true;
2226         return 0;
2227 }
2228
2229 int setup_intlist(struct intlist **list, const char *list_str,
2230                   const char *list_name)
2231 {
2232         if (list_str == NULL)
2233                 return 0;
2234
2235         *list = intlist__new(list_str);
2236         if (!*list) {
2237                 pr_err("problems parsing %s list\n", list_name);
2238                 return -1;
2239         }
2240         return 0;
2241 }
2242
2243 static bool symbol__read_kptr_restrict(void)
2244 {
2245         bool value = false;
2246         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2247
2248         if (fp != NULL) {
2249                 char line[8];
2250
2251                 if (fgets(line, sizeof(line), fp) != NULL)
2252                         value = perf_cap__capable(CAP_SYSLOG) ?
2253                                         (atoi(line) >= 2) :
2254                                         (atoi(line) != 0);
2255
2256                 fclose(fp);
2257         }
2258
2259         /* Per kernel/kallsyms.c:
2260          * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2261          */
2262         if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2263                 value = true;
2264
2265         return value;
2266 }
2267
2268 int symbol__annotation_init(void)
2269 {
2270         if (symbol_conf.init_annotation)
2271                 return 0;
2272
2273         if (symbol_conf.initialized) {
2274                 pr_err("Annotation needs to be init before symbol__init()\n");
2275                 return -1;
2276         }
2277
2278         symbol_conf.priv_size += sizeof(struct annotation);
2279         symbol_conf.init_annotation = true;
2280         return 0;
2281 }
2282
2283 int symbol__init(struct perf_env *env)
2284 {
2285         const char *symfs;
2286
2287         if (symbol_conf.initialized)
2288                 return 0;
2289
2290         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2291
2292         symbol__elf_init();
2293
2294         if (symbol_conf.sort_by_name)
2295                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2296                                           sizeof(struct symbol));
2297
2298         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2299                 return -1;
2300
2301         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2302                 pr_err("'.' is the only non valid --field-separator argument\n");
2303                 return -1;
2304         }
2305
2306         if (setup_list(&symbol_conf.dso_list,
2307                        symbol_conf.dso_list_str, "dso") < 0)
2308                 return -1;
2309
2310         if (setup_list(&symbol_conf.comm_list,
2311                        symbol_conf.comm_list_str, "comm") < 0)
2312                 goto out_free_dso_list;
2313
2314         if (setup_intlist(&symbol_conf.pid_list,
2315                        symbol_conf.pid_list_str, "pid") < 0)
2316                 goto out_free_comm_list;
2317
2318         if (setup_intlist(&symbol_conf.tid_list,
2319                        symbol_conf.tid_list_str, "tid") < 0)
2320                 goto out_free_pid_list;
2321
2322         if (setup_list(&symbol_conf.sym_list,
2323                        symbol_conf.sym_list_str, "symbol") < 0)
2324                 goto out_free_tid_list;
2325
2326         if (setup_list(&symbol_conf.bt_stop_list,
2327                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2328                 goto out_free_sym_list;
2329
2330         /*
2331          * A path to symbols of "/" is identical to ""
2332          * reset here for simplicity.
2333          */
2334         symfs = realpath(symbol_conf.symfs, NULL);
2335         if (symfs == NULL)
2336                 symfs = symbol_conf.symfs;
2337         if (strcmp(symfs, "/") == 0)
2338                 symbol_conf.symfs = "";
2339         if (symfs != symbol_conf.symfs)
2340                 free((void *)symfs);
2341
2342         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2343
2344         symbol_conf.initialized = true;
2345         return 0;
2346
2347 out_free_sym_list:
2348         strlist__delete(symbol_conf.sym_list);
2349 out_free_tid_list:
2350         intlist__delete(symbol_conf.tid_list);
2351 out_free_pid_list:
2352         intlist__delete(symbol_conf.pid_list);
2353 out_free_comm_list:
2354         strlist__delete(symbol_conf.comm_list);
2355 out_free_dso_list:
2356         strlist__delete(symbol_conf.dso_list);
2357         return -1;
2358 }
2359
2360 void symbol__exit(void)
2361 {
2362         if (!symbol_conf.initialized)
2363                 return;
2364         strlist__delete(symbol_conf.bt_stop_list);
2365         strlist__delete(symbol_conf.sym_list);
2366         strlist__delete(symbol_conf.dso_list);
2367         strlist__delete(symbol_conf.comm_list);
2368         intlist__delete(symbol_conf.tid_list);
2369         intlist__delete(symbol_conf.pid_list);
2370         vmlinux_path__exit();
2371         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2372         symbol_conf.bt_stop_list = NULL;
2373         symbol_conf.initialized = false;
2374 }
2375
2376 int symbol__config_symfs(const struct option *opt __maybe_unused,
2377                          const char *dir, int unset __maybe_unused)
2378 {
2379         char *bf = NULL;
2380         int ret;
2381
2382         symbol_conf.symfs = strdup(dir);
2383         if (symbol_conf.symfs == NULL)
2384                 return -ENOMEM;
2385
2386         /* skip the locally configured cache if a symfs is given, and
2387          * config buildid dir to symfs/.debug
2388          */
2389         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2390         if (ret < 0)
2391                 return -ENOMEM;
2392
2393         set_buildid_dir(bf);
2394
2395         free(bf);
2396         return 0;
2397 }
2398
2399 struct mem_info *mem_info__get(struct mem_info *mi)
2400 {
2401         if (mi)
2402                 refcount_inc(&mi->refcnt);
2403         return mi;
2404 }
2405
2406 void mem_info__put(struct mem_info *mi)
2407 {
2408         if (mi && refcount_dec_and_test(&mi->refcnt))
2409                 free(mi);
2410 }
2411
2412 struct mem_info *mem_info__new(void)
2413 {
2414         struct mem_info *mi = zalloc(sizeof(*mi));
2415
2416         if (mi)
2417                 refcount_set(&mi->refcnt, 1);
2418         return mi;
2419 }