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                 "psw_idle",
 670                 "psw_idle_exit",
 671                 NULL
 672         };
 673         int i;
 674         static struct strlist *idle_symbols_list;
 675
 676         if (idle_symbols_list)
 677                 return strlist__has_entry(idle_symbols_list, name);
 678
 679         idle_symbols_list = strlist__new(NULL, NULL);
 680
 681         for (i = 0; idle_symbols[i]; i++)
 682                 strlist__add(idle_symbols_list, idle_symbols[i]);
 683
 684         return strlist__has_entry(idle_symbols_list, name);
 685 }
 686
 687 static int map__process_kallsym_symbol(void *arg, const char *name,
 688                                        char type, u64 start)
 689 {
 690         struct symbol *sym;
 691         struct dso *dso = arg;
 692         struct rb_root_cached *root = &dso->symbols;
 693
 694         if (!symbol_type__filter(type))
 695                 return 0;
 696
 697         /*
 698          * module symbols are not sorted so we add all
 699          * symbols, setting length to 0, and rely on
 700          * symbols__fixup_end() to fix it up.
 701          */
 702         sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 703         if (sym == NULL)
 704                 return -ENOMEM;
 705         /*
 706          * We will pass the symbols to the filter later, in
 707          * map__split_kallsyms, when we have split the maps per module
 708          */
 709         __symbols__insert(root, sym, !strchr(name, '['));
 710
 711         return 0;
 712 }
 713
 714 /*
 715  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 716  * so that we can in the next step set the symbol ->end address and then
 717  * call kernel_maps__split_kallsyms.
 718  */
 719 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 720 {
 721         return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 722 }
 723
 724 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
 725 {
 726         struct map *curr_map;
 727         struct symbol *pos;
 728         int count = 0;
 729         struct rb_root_cached old_root = dso->symbols;
 730         struct rb_root_cached *root = &dso->symbols;
 731         struct rb_node *next = rb_first_cached(root);
 732
 733         if (!kmaps)
 734                 return -1;
 735
 736         *root = RB_ROOT_CACHED;
 737
 738         while (next) {
 739                 char *module;
 740
 741                 pos = rb_entry(next, struct symbol, rb_node);
 742                 next = rb_next(&pos->rb_node);
 743
 744                 rb_erase_cached(&pos->rb_node, &old_root);
 745                 RB_CLEAR_NODE(&pos->rb_node);
 746                 module = strchr(pos->name, '\t');
 747                 if (module)
 748                         *module = '\0';
 749
 750                 curr_map = maps__find(kmaps, pos->start);
 751
 752                 if (!curr_map) {
 753                         symbol__delete(pos);
 754                         continue;
 755                 }
 756
 757                 pos->start -= curr_map->start - curr_map->pgoff;
 758                 if (pos->end > curr_map->end)
 759                         pos->end = curr_map->end;
 760                 if (pos->end)
 761                         pos->end -= curr_map->start - curr_map->pgoff;
 762                 symbols__insert(&curr_map->dso->symbols, pos);
 763                 ++count;
 764         }
 765
 766         /* Symbols have been adjusted */
 767         dso->adjust_symbols = 1;
 768
 769         return count;
 770 }
 771
 772 /*
 773  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 774  * kernel range is broken in several maps, named [kernel].N, as we don't have
 775  * the original ELF section names vmlinux have.
 776  */
 777 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 778                                 struct map *initial_map)
 779 {
 780         struct machine *machine;
 781         struct map *curr_map = initial_map;
 782         struct symbol *pos;
 783         int count = 0, moved = 0;
 784         struct rb_root_cached *root = &dso->symbols;
 785         struct rb_node *next = rb_first_cached(root);
 786         int kernel_range = 0;
 787         bool x86_64;
 788
 789         if (!kmaps)
 790                 return -1;
 791
 792         machine = kmaps->machine;
 793
 794         x86_64 = machine__is(machine, "x86_64");
 795
 796         while (next) {
 797                 char *module;
 798
 799                 pos = rb_entry(next, struct symbol, rb_node);
 800                 next = rb_next(&pos->rb_node);
 801
 802                 module = strchr(pos->name, '\t');
 803                 if (module) {
 804                         if (!symbol_conf.use_modules)
 805                                 goto discard_symbol;
 806
 807                         *module++ = '\0';
 808
 809                         if (strcmp(curr_map->dso->short_name, module)) {
 810                                 if (curr_map != initial_map &&
 811                                     dso->kernel == DSO_SPACE__KERNEL_GUEST &&
 812                                     machine__is_default_guest(machine)) {
 813                                         /*
 814                                          * We assume all symbols of a module are
 815                                          * continuous in * kallsyms, so curr_map
 816                                          * points to a module and all its
 817                                          * symbols are in its kmap. Mark it as
 818                                          * loaded.
 819                                          */
 820                                         dso__set_loaded(curr_map->dso);
 821                                 }
 822
 823                                 curr_map = maps__find_by_name(kmaps, module);
 824                                 if (curr_map == NULL) {
 825                                         pr_debug("%s/proc/{kallsyms,modules} "
 826                                                  "inconsistency while looking "
 827                                                  "for \"%s\" module!\n",
 828                                                  machine->root_dir, module);
 829                                         curr_map = initial_map;
 830                                         goto discard_symbol;
 831                                 }
 832
 833                                 if (curr_map->dso->loaded &&
 834                                     !machine__is_default_guest(machine))
 835                                         goto discard_symbol;
 836                         }
 837                         /*
 838                          * So that we look just like we get from .ko files,
 839                          * i.e. not prelinked, relative to initial_map->start.
 840                          */
 841                         pos->start = curr_map->map_ip(curr_map, pos->start);
 842                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 843                 } else if (x86_64 && is_entry_trampoline(pos->name)) {
 844                         /*
 845                          * These symbols are not needed anymore since the
 846                          * trampoline maps refer to the text section and it's
 847                          * symbols instead. Avoid having to deal with
 848                          * relocations, and the assumption that the first symbol
 849                          * is the start of kernel text, by simply removing the
 850                          * symbols at this point.
 851                          */
 852                         goto discard_symbol;
 853                 } else if (curr_map != initial_map) {
 854                         char dso_name[PATH_MAX];
 855                         struct dso *ndso;
 856
 857                         if (delta) {
 858                                 /* Kernel was relocated at boot time */
 859                                 pos->start -= delta;
 860                                 pos->end -= delta;
 861                         }
 862
 863                         if (count == 0) {
 864                                 curr_map = initial_map;
 865                                 goto add_symbol;
 866                         }
 867
 868                         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
 869                                 snprintf(dso_name, sizeof(dso_name),
 870                                         "[guest.kernel].%d",
 871                                         kernel_range++);
 872                         else
 873                                 snprintf(dso_name, sizeof(dso_name),
 874                                         "[kernel].%d",
 875                                         kernel_range++);
 876
 877                         ndso = dso__new(dso_name);
 878                         if (ndso == NULL)
 879                                 return -1;
 880
 881                         ndso->kernel = dso->kernel;
 882
 883                         curr_map = map__new2(pos->start, ndso);
 884                         if (curr_map == NULL) {
 885                                 dso__put(ndso);
 886                                 return -1;
 887                         }
 888
 889                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 890                         maps__insert(kmaps, curr_map);
 891                         ++kernel_range;
 892                 } else if (delta) {
 893                         /* Kernel was relocated at boot time */
 894                         pos->start -= delta;
 895                         pos->end -= delta;
 896                 }
 897 add_symbol:
 898                 if (curr_map != initial_map) {
 899                         rb_erase_cached(&pos->rb_node, root);
 900                         symbols__insert(&curr_map->dso->symbols, pos);
 901                         ++moved;
 902                 } else
 903                         ++count;
 904
 905                 continue;
 906 discard_symbol:
 907                 rb_erase_cached(&pos->rb_node, root);
 908                 symbol__delete(pos);
 909         }
 910
 911         if (curr_map != initial_map &&
 912             dso->kernel == DSO_SPACE__KERNEL_GUEST &&
 913             machine__is_default_guest(kmaps->machine)) {
 914                 dso__set_loaded(curr_map->dso);
 915         }
 916
 917         return count + moved;
 918 }
 919
 920 bool symbol__restricted_filename(const char *filename,
 921                                  const char *restricted_filename)
 922 {
 923         bool restricted = false;
 924
 925         if (symbol_conf.kptr_restrict) {
 926                 char *r = realpath(filename, NULL);
 927
 928                 if (r != NULL) {
 929                         restricted = strcmp(r, restricted_filename) == 0;
 930                         free(r);
 931                         return restricted;
 932                 }
 933         }
 934
 935         return restricted;
 936 }
 937
 938 struct module_info {
 939         struct rb_node rb_node;
 940         char *name;
 941         u64 start;
 942 };
 943
 944 static void add_module(struct module_info *mi, struct rb_root *modules)
 945 {
 946         struct rb_node **p = &modules->rb_node;
 947         struct rb_node *parent = NULL;
 948         struct module_info *m;
 949
 950         while (*p != NULL) {
 951                 parent = *p;
 952                 m = rb_entry(parent, struct module_info, rb_node);
 953                 if (strcmp(mi->name, m->name) < 0)
 954                         p = &(*p)->rb_left;
 955                 else
 956                         p = &(*p)->rb_right;
 957         }
 958         rb_link_node(&mi->rb_node, parent, p);
 959         rb_insert_color(&mi->rb_node, modules);
 960 }
 961
 962 static void delete_modules(struct rb_root *modules)
 963 {
 964         struct module_info *mi;
 965         struct rb_node *next = rb_first(modules);
 966
 967         while (next) {
 968                 mi = rb_entry(next, struct module_info, rb_node);
 969                 next = rb_next(&mi->rb_node);
 970                 rb_erase(&mi->rb_node, modules);
 971                 zfree(&mi->name);
 972                 free(mi);
 973         }
 974 }
 975
 976 static struct module_info *find_module(const char *name,
 977                                        struct rb_root *modules)
 978 {
 979         struct rb_node *n = modules->rb_node;
 980
 981         while (n) {
 982                 struct module_info *m;
 983                 int cmp;
 984
 985                 m = rb_entry(n, struct module_info, rb_node);
 986                 cmp = strcmp(name, m->name);
 987                 if (cmp < 0)
 988                         n = n->rb_left;
 989                 else if (cmp > 0)
 990                         n = n->rb_right;
 991                 else
 992                         return m;
 993         }
 994
 995         return NULL;
 996 }
 997
 998 static int __read_proc_modules(void *arg, const char *name, u64 start,
 999                                u64 size __maybe_unused)
1000 {
1001         struct rb_root *modules = arg;
1002         struct module_info *mi;
1003
1004         mi = zalloc(sizeof(struct module_info));
1005         if (!mi)
1006                 return -ENOMEM;
1007
1008         mi->name = strdup(name);
1009         mi->start = start;
1010
1011         if (!mi->name) {
1012                 free(mi);
1013                 return -ENOMEM;
1014         }
1015
1016         add_module(mi, modules);
1017
1018         return 0;
1019 }
1020
1021 static int read_proc_modules(const char *filename, struct rb_root *modules)
1022 {
1023         if (symbol__restricted_filename(filename, "/proc/modules"))
1024                 return -1;
1025
1026         if (modules__parse(filename, modules, __read_proc_modules)) {
1027                 delete_modules(modules);
1028                 return -1;
1029         }
1030
1031         return 0;
1032 }
1033
1034 int compare_proc_modules(const char *from, const char *to)
1035 {
1036         struct rb_root from_modules = RB_ROOT;
1037         struct rb_root to_modules = RB_ROOT;
1038         struct rb_node *from_node, *to_node;
1039         struct module_info *from_m, *to_m;
1040         int ret = -1;
1041
1042         if (read_proc_modules(from, &from_modules))
1043                 return -1;
1044
1045         if (read_proc_modules(to, &to_modules))
1046                 goto out_delete_from;
1047
1048         from_node = rb_first(&from_modules);
1049         to_node = rb_first(&to_modules);
1050         while (from_node) {
1051                 if (!to_node)
1052                         break;
1053
1054                 from_m = rb_entry(from_node, struct module_info, rb_node);
1055                 to_m = rb_entry(to_node, struct module_info, rb_node);
1056
1057                 if (from_m->start != to_m->start ||
1058                     strcmp(from_m->name, to_m->name))
1059                         break;
1060
1061                 from_node = rb_next(from_node);
1062                 to_node = rb_next(to_node);
1063         }
1064
1065         if (!from_node && !to_node)
1066                 ret = 0;
1067
1068         delete_modules(&to_modules);
1069 out_delete_from:
1070         delete_modules(&from_modules);
1071
1072         return ret;
1073 }
1074
1075 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1076 {
1077         struct rb_root modules = RB_ROOT;
1078         struct map *old_map;
1079         int err;
1080
1081         err = read_proc_modules(filename, &modules);
1082         if (err)
1083                 return err;
1084
1085         maps__for_each_entry(kmaps, old_map) {
1086                 struct module_info *mi;
1087
1088                 if (!__map__is_kmodule(old_map)) {
1089                         continue;
1090                 }
1091
1092                 /* Module must be in memory at the same address */
1093                 mi = find_module(old_map->dso->short_name, &modules);
1094                 if (!mi || mi->start != old_map->start) {
1095                         err = -EINVAL;
1096                         goto out;
1097                 }
1098         }
1099 out:
1100         delete_modules(&modules);
1101         return err;
1102 }
1103
1104 /*
1105  * If kallsyms is referenced by name then we look for filename in the same
1106  * directory.
1107  */
1108 static bool filename_from_kallsyms_filename(char *filename,
1109                                             const char *base_name,
1110                                             const char *kallsyms_filename)
1111 {
1112         char *name;
1113
1114         strcpy(filename, kallsyms_filename);
1115         name = strrchr(filename, '/');
1116         if (!name)
1117                 return false;
1118
1119         name += 1;
1120
1121         if (!strcmp(name, "kallsyms")) {
1122                 strcpy(name, base_name);
1123                 return true;
1124         }
1125
1126         return false;
1127 }
1128
1129 static int validate_kcore_modules(const char *kallsyms_filename,
1130                                   struct map *map)
1131 {
1132         struct maps *kmaps = map__kmaps(map);
1133         char modules_filename[PATH_MAX];
1134
1135         if (!kmaps)
1136                 return -EINVAL;
1137
1138         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1139                                              kallsyms_filename))
1140                 return -EINVAL;
1141
1142         if (do_validate_kcore_modules(modules_filename, kmaps))
1143                 return -EINVAL;
1144
1145         return 0;
1146 }
1147
1148 static int validate_kcore_addresses(const char *kallsyms_filename,
1149                                     struct map *map)
1150 {
1151         struct kmap *kmap = map__kmap(map);
1152
1153         if (!kmap)
1154                 return -EINVAL;
1155
1156         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1157                 u64 start;
1158
1159                 if (kallsyms__get_function_start(kallsyms_filename,
1160                                                  kmap->ref_reloc_sym->name, &start))
1161                         return -ENOENT;
1162                 if (start != kmap->ref_reloc_sym->addr)
1163                         return -EINVAL;
1164         }
1165
1166         return validate_kcore_modules(kallsyms_filename, map);
1167 }
1168
1169 struct kcore_mapfn_data {
1170         struct dso *dso;
1171         struct list_head maps;
1172 };
1173
1174 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1175 {
1176         struct kcore_mapfn_data *md = data;
1177         struct map *map;
1178
1179         map = map__new2(start, md->dso);
1180         if (map == NULL)
1181                 return -ENOMEM;
1182
1183         map->end = map->start + len;
1184         map->pgoff = pgoff;
1185
1186         list_add(&map->node, &md->maps);
1187
1188         return 0;
1189 }
1190
1191 /*
1192  * Merges map into maps by splitting the new map within the existing map
1193  * regions.
1194  */
1195 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1196 {
1197         struct map *old_map;
1198         LIST_HEAD(merged);
1199
1200         maps__for_each_entry(kmaps, old_map) {
1201                 /* no overload with this one */
1202                 if (new_map->end < old_map->start ||
1203                     new_map->start >= old_map->end)
1204                         continue;
1205
1206                 if (new_map->start < old_map->start) {
1207                         /*
1208                          * |new......
1209                          *       |old....
1210                          */
1211                         if (new_map->end < old_map->end) {
1212                                 /*
1213                                  * |new......|     -> |new..|
1214                                  *       |old....| ->       |old....|
1215                                  */
1216                                 new_map->end = old_map->start;
1217                         } else {
1218                                 /*
1219                                  * |new.............| -> |new..|       |new..|
1220                                  *       |old....|    ->       |old....|
1221                                  */
1222                                 struct map *m = map__clone(new_map);
1223
1224                                 if (!m)
1225                                         return -ENOMEM;
1226
1227                                 m->end = old_map->start;
1228                                 list_add_tail(&m->node, &merged);
1229                                 new_map->pgoff += old_map->end - new_map->start;
1230                                 new_map->start = old_map->end;
1231                         }
1232                 } else {
1233                         /*
1234                          *      |new......
1235                          * |old....
1236                          */
1237                         if (new_map->end < old_map->end) {
1238                                 /*
1239                                  *      |new..|   -> x
1240                                  * |old.........| -> |old.........|
1241                                  */
1242                                 map__put(new_map);
1243                                 new_map = NULL;
1244                                 break;
1245                         } else {
1246                                 /*
1247                                  *      |new......| ->         |new...|
1248                                  * |old....|        -> |old....|
1249                                  */
1250                                 new_map->pgoff += old_map->end - new_map->start;
1251                                 new_map->start = old_map->end;
1252                         }
1253                 }
1254         }
1255
1256         while (!list_empty(&merged)) {
1257                 old_map = list_entry(merged.next, struct map, node);
1258                 list_del_init(&old_map->node);
1259                 maps__insert(kmaps, old_map);
1260                 map__put(old_map);
1261         }
1262
1263         if (new_map) {
1264                 maps__insert(kmaps, new_map);
1265                 map__put(new_map);
1266         }
1267         return 0;
1268 }
1269
1270 static int dso__load_kcore(struct dso *dso, struct map *map,
1271                            const char *kallsyms_filename)
1272 {
1273         struct maps *kmaps = map__kmaps(map);
1274         struct kcore_mapfn_data md;
1275         struct map *old_map, *new_map, *replacement_map = NULL, *next;
1276         struct machine *machine;
1277         bool is_64_bit;
1278         int err, fd;
1279         char kcore_filename[PATH_MAX];
1280         u64 stext;
1281
1282         if (!kmaps)
1283                 return -EINVAL;
1284
1285         machine = kmaps->machine;
1286
1287         /* This function requires that the map is the kernel map */
1288         if (!__map__is_kernel(map))
1289                 return -EINVAL;
1290
1291         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1292                                              kallsyms_filename))
1293                 return -EINVAL;
1294
1295         /* Modules and kernel must be present at their original addresses */
1296         if (validate_kcore_addresses(kallsyms_filename, map))
1297                 return -EINVAL;
1298
1299         md.dso = dso;
1300         INIT_LIST_HEAD(&md.maps);
1301
1302         fd = open(kcore_filename, O_RDONLY);
1303         if (fd < 0) {
1304                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1305                          kcore_filename);
1306                 return -EINVAL;
1307         }
1308
1309         /* Read new maps into temporary lists */
1310         err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1311                               &is_64_bit);
1312         if (err)
1313                 goto out_err;
1314         dso->is_64_bit = is_64_bit;
1315
1316         if (list_empty(&md.maps)) {
1317                 err = -EINVAL;
1318                 goto out_err;
1319         }
1320
1321         /* Remove old maps */
1322         maps__for_each_entry_safe(kmaps, old_map, next) {
1323                 /*
1324                  * We need to preserve eBPF maps even if they are
1325                  * covered by kcore, because we need to access
1326                  * eBPF dso for source data.
1327                  */
1328                 if (old_map != map && !__map__is_bpf_prog(old_map))
1329                         maps__remove(kmaps, old_map);
1330         }
1331         machine->trampolines_mapped = false;
1332
1333         /* Find the kernel map using the '_stext' symbol */
1334         if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1335                 list_for_each_entry(new_map, &md.maps, node) {
1336                         if (stext >= new_map->start && stext < new_map->end) {
1337                                 replacement_map = new_map;
1338                                 break;
1339                         }
1340                 }
1341         }
1342
1343         if (!replacement_map)
1344                 replacement_map = list_entry(md.maps.next, struct map, node);
1345
1346         /* Add new maps */
1347         while (!list_empty(&md.maps)) {
1348                 new_map = list_entry(md.maps.next, struct map, node);
1349                 list_del_init(&new_map->node);
1350                 if (new_map == replacement_map) {
1351                         map->start      = new_map->start;
1352                         map->end        = new_map->end;
1353                         map->pgoff      = new_map->pgoff;
1354                         map->map_ip     = new_map->map_ip;
1355                         map->unmap_ip   = new_map->unmap_ip;
1356                         /* Ensure maps are correctly ordered */
1357                         map__get(map);
1358                         maps__remove(kmaps, map);
1359                         maps__insert(kmaps, map);
1360                         map__put(map);
1361                         map__put(new_map);
1362                 } else {
1363                         /*
1364                          * Merge kcore map into existing maps,
1365                          * and ensure that current maps (eBPF)
1366                          * stay intact.
1367                          */
1368                         if (maps__merge_in(kmaps, new_map))
1369                                 goto out_err;
1370                 }
1371         }
1372
1373         if (machine__is(machine, "x86_64")) {
1374                 u64 addr;
1375
1376                 /*
1377                  * If one of the corresponding symbols is there, assume the
1378                  * entry trampoline maps are too.
1379                  */
1380                 if (!kallsyms__get_function_start(kallsyms_filename,
1381                                                   ENTRY_TRAMPOLINE_NAME,
1382                                                   &addr))
1383                         machine->trampolines_mapped = true;
1384         }
1385
1386         /*
1387          * Set the data type and long name so that kcore can be read via
1388          * dso__data_read_addr().
1389          */
1390         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1391                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1392         else
1393                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1394         dso__set_long_name(dso, strdup(kcore_filename), true);
1395
1396         close(fd);
1397
1398         if (map->prot & PROT_EXEC)
1399                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1400         else
1401                 pr_debug("Using %s for kernel data\n", kcore_filename);
1402
1403         return 0;
1404
1405 out_err:
1406         while (!list_empty(&md.maps)) {
1407                 map = list_entry(md.maps.next, struct map, node);
1408                 list_del_init(&map->node);
1409                 map__put(map);
1410         }
1411         close(fd);
1412         return -EINVAL;
1413 }
1414
1415 /*
1416  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1417  * delta based on the relocation reference symbol.
1418  */
1419 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1420 {
1421         u64 addr;
1422
1423         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1424                 return 0;
1425
1426         if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1427                 return -1;
1428
1429         *delta = addr - kmap->ref_reloc_sym->addr;
1430         return 0;
1431 }
1432
1433 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1434                          struct map *map, bool no_kcore)
1435 {
1436         struct kmap *kmap = map__kmap(map);
1437         u64 delta = 0;
1438
1439         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1440                 return -1;
1441
1442         if (!kmap || !kmap->kmaps)
1443                 return -1;
1444
1445         if (dso__load_all_kallsyms(dso, filename) < 0)
1446                 return -1;
1447
1448         if (kallsyms__delta(kmap, filename, &delta))
1449                 return -1;
1450
1451         symbols__fixup_end(&dso->symbols);
1452         symbols__fixup_duplicate(&dso->symbols);
1453
1454         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1455                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1456         else
1457                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1458
1459         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1460                 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1461         else
1462                 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1463 }
1464
1465 int dso__load_kallsyms(struct dso *dso, const char *filename,
1466                        struct map *map)
1467 {
1468         return __dso__load_kallsyms(dso, filename, map, false);
1469 }
1470
1471 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1472 {
1473         char *line = NULL;
1474         size_t n;
1475         FILE *file;
1476         int nr_syms = 0;
1477
1478         file = fopen(map_path, "r");
1479         if (file == NULL)
1480                 goto out_failure;
1481
1482         while (!feof(file)) {
1483                 u64 start, size;
1484                 struct symbol *sym;
1485                 int line_len, len;
1486
1487                 line_len = getline(&line, &n, file);
1488                 if (line_len < 0)
1489                         break;
1490
1491                 if (!line)
1492                         goto out_failure;
1493
1494                 line[--line_len] = '\0'; /* \n */
1495
1496                 len = hex2u64(line, &start);
1497
1498                 len++;
1499                 if (len + 2 >= line_len)
1500                         continue;
1501
1502                 len += hex2u64(line + len, &size);
1503
1504                 len++;
1505                 if (len + 2 >= line_len)
1506                         continue;
1507
1508                 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1509
1510                 if (sym == NULL)
1511                         goto out_delete_line;
1512
1513                 symbols__insert(&dso->symbols, sym);
1514                 nr_syms++;
1515         }
1516
1517         free(line);
1518         fclose(file);
1519
1520         return nr_syms;
1521
1522 out_delete_line:
1523         free(line);
1524 out_failure:
1525         return -1;
1526 }
1527
1528 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1529                                            enum dso_binary_type type)
1530 {
1531         switch (type) {
1532         case DSO_BINARY_TYPE__JAVA_JIT:
1533         case DSO_BINARY_TYPE__DEBUGLINK:
1534         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1535         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1536         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1537         case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1538         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1539         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1540                 return !kmod && dso->kernel == DSO_SPACE__USER;
1541
1542         case DSO_BINARY_TYPE__KALLSYMS:
1543         case DSO_BINARY_TYPE__VMLINUX:
1544         case DSO_BINARY_TYPE__KCORE:
1545                 return dso->kernel == DSO_SPACE__KERNEL;
1546
1547         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1548         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1549         case DSO_BINARY_TYPE__GUEST_KCORE:
1550                 return dso->kernel == DSO_SPACE__KERNEL_GUEST;
1551
1552         case DSO_BINARY_TYPE__GUEST_KMODULE:
1553         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1554         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1555         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1556                 /*
1557                  * kernel modules know their symtab type - it's set when
1558                  * creating a module dso in machine__addnew_module_map().
1559                  */
1560                 return kmod && dso->symtab_type == type;
1561
1562         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1563         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1564                 return true;
1565
1566         case DSO_BINARY_TYPE__BPF_PROG_INFO:
1567         case DSO_BINARY_TYPE__BPF_IMAGE:
1568         case DSO_BINARY_TYPE__OOL:
1569         case DSO_BINARY_TYPE__NOT_FOUND:
1570         default:
1571                 return false;
1572         }
1573 }
1574
1575 /* Checks for the existence of the perf-<pid>.map file in two different
1576  * locations.  First, if the process is a separate mount namespace, check in
1577  * that namespace using the pid of the innermost pid namespace.  If's not in a
1578  * namespace, or the file can't be found there, try in the mount namespace of
1579  * the tracing process using our view of its pid.
1580  */
1581 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1582                               struct nsinfo **nsip)
1583 {
1584         struct nscookie nsc;
1585         struct nsinfo *nsi;
1586         struct nsinfo *nnsi;
1587         int rc = -1;
1588
1589         nsi = *nsip;
1590
1591         if (nsi->need_setns) {
1592                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1593                 nsinfo__mountns_enter(nsi, &nsc);
1594                 rc = access(filebuf, R_OK);
1595                 nsinfo__mountns_exit(&nsc);
1596                 if (rc == 0)
1597                         return rc;
1598         }
1599
1600         nnsi = nsinfo__copy(nsi);
1601         if (nnsi) {
1602                 nsinfo__put(nsi);
1603
1604                 nnsi->need_setns = false;
1605                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1606                 *nsip = nnsi;
1607                 rc = 0;
1608         }
1609
1610         return rc;
1611 }
1612
1613 int dso__load(struct dso *dso, struct map *map)
1614 {
1615         char *name;
1616         int ret = -1;
1617         u_int i;
1618         struct machine *machine = NULL;
1619         char *root_dir = (char *) "";
1620         int ss_pos = 0;
1621         struct symsrc ss_[2];
1622         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1623         bool kmod;
1624         bool perfmap;
1625         unsigned char build_id[BUILD_ID_SIZE];
1626         struct nscookie nsc;
1627         char newmapname[PATH_MAX];
1628         const char *map_path = dso->long_name;
1629
1630         perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1631         if (perfmap) {
1632                 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1633                     sizeof(newmapname), &dso->nsinfo) == 0)) {
1634                         map_path = newmapname;
1635                 }
1636         }
1637
1638         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1639         pthread_mutex_lock(&dso->lock);
1640
1641         /* check again under the dso->lock */
1642         if (dso__loaded(dso)) {
1643                 ret = 1;
1644                 goto out;
1645         }
1646
1647         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1648                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1649                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1650                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1651
1652         if (dso->kernel && !kmod) {
1653                 if (dso->kernel == DSO_SPACE__KERNEL)
1654                         ret = dso__load_kernel_sym(dso, map);
1655                 else if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1656                         ret = dso__load_guest_kernel_sym(dso, map);
1657
1658                 machine = map__kmaps(map)->machine;
1659                 if (machine__is(machine, "x86_64"))
1660                         machine__map_x86_64_entry_trampolines(machine, dso);
1661                 goto out;
1662         }
1663
1664         dso->adjust_symbols = 0;
1665
1666         if (perfmap) {
1667                 ret = dso__load_perf_map(map_path, dso);
1668                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1669                                              DSO_BINARY_TYPE__NOT_FOUND;
1670                 goto out;
1671         }
1672
1673         if (machine)
1674                 root_dir = machine->root_dir;
1675
1676         name = malloc(PATH_MAX);
1677         if (!name)
1678                 goto out;
1679
1680         /*
1681          * Read the build id if possible. This is required for
1682          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1683          */
1684         if (!dso->has_build_id &&
1685             is_regular_file(dso->long_name)) {
1686             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1687             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1688                 dso__set_build_id(dso, build_id);
1689         }
1690
1691         /*
1692          * Iterate over candidate debug images.
1693          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1694          * and/or opd section) for processing.
1695          */
1696         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1697                 struct symsrc *ss = &ss_[ss_pos];
1698                 bool next_slot = false;
1699                 bool is_reg;
1700                 bool nsexit;
1701                 int sirc = -1;
1702
1703                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1704
1705                 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1706                     symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1707
1708                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1709                         continue;
1710
1711                 if (dso__read_binary_type_filename(dso, symtab_type,
1712                                                    root_dir, name, PATH_MAX))
1713                         continue;
1714
1715                 if (nsexit)
1716                         nsinfo__mountns_exit(&nsc);
1717
1718                 is_reg = is_regular_file(name);
1719                 if (is_reg)
1720                         sirc = symsrc__init(ss, dso, name, symtab_type);
1721
1722                 if (nsexit)
1723                         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1724
1725                 if (!is_reg || sirc < 0)
1726                         continue;
1727
1728                 if (!syms_ss && symsrc__has_symtab(ss)) {
1729                         syms_ss = ss;
1730                         next_slot = true;
1731                         if (!dso->symsrc_filename)
1732                                 dso->symsrc_filename = strdup(name);
1733                 }
1734
1735                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1736                         runtime_ss = ss;
1737                         next_slot = true;
1738                 }
1739
1740                 if (next_slot) {
1741                         ss_pos++;
1742
1743                         if (syms_ss && runtime_ss)
1744                                 break;
1745                 } else {
1746                         symsrc__destroy(ss);
1747                 }
1748
1749         }
1750
1751         if (!runtime_ss && !syms_ss)
1752                 goto out_free;
1753
1754         if (runtime_ss && !syms_ss) {
1755                 syms_ss = runtime_ss;
1756         }
1757
1758         /* We'll have to hope for the best */
1759         if (!runtime_ss && syms_ss)
1760                 runtime_ss = syms_ss;
1761
1762         if (syms_ss)
1763                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1764         else
1765                 ret = -1;
1766
1767         if (ret > 0) {
1768                 int nr_plt;
1769
1770                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1771                 if (nr_plt > 0)
1772                         ret += nr_plt;
1773         }
1774
1775         for (; ss_pos > 0; ss_pos--)
1776                 symsrc__destroy(&ss_[ss_pos - 1]);
1777 out_free:
1778         free(name);
1779         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1780                 ret = 0;
1781 out:
1782         dso__set_loaded(dso);
1783         pthread_mutex_unlock(&dso->lock);
1784         nsinfo__mountns_exit(&nsc);
1785
1786         return ret;
1787 }
1788
1789 static int map__strcmp(const void *a, const void *b)
1790 {
1791         const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1792         return strcmp(ma->dso->short_name, mb->dso->short_name);
1793 }
1794
1795 static int map__strcmp_name(const void *name, const void *b)
1796 {
1797         const struct map *map = *(const struct map **)b;
1798         return strcmp(name, map->dso->short_name);
1799 }
1800
1801 void __maps__sort_by_name(struct maps *maps)
1802 {
1803         qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1804 }
1805
1806 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1807 {
1808         struct map *map;
1809         struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1810         int i = 0;
1811
1812         if (maps_by_name == NULL)
1813                 return -1;
1814
1815         maps->maps_by_name = maps_by_name;
1816         maps->nr_maps_allocated = maps->nr_maps;
1817
1818         maps__for_each_entry(maps, map)
1819                 maps_by_name[i++] = map;
1820
1821         __maps__sort_by_name(maps);
1822         return 0;
1823 }
1824
1825 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1826 {
1827         struct map **mapp;
1828
1829         if (maps->maps_by_name == NULL &&
1830             map__groups__sort_by_name_from_rbtree(maps))
1831                 return NULL;
1832
1833         mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1834         if (mapp)
1835                 return *mapp;
1836         return NULL;
1837 }
1838
1839 struct map *maps__find_by_name(struct maps *maps, const char *name)
1840 {
1841         struct map *map;
1842
1843         down_read(&maps->lock);
1844
1845         if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1846                 map = maps->last_search_by_name;
1847                 goto out_unlock;
1848         }
1849         /*
1850          * If we have maps->maps_by_name, then the name isn't in the rbtree,
1851          * as maps->maps_by_name mirrors the rbtree when lookups by name are
1852          * made.
1853          */
1854         map = __maps__find_by_name(maps, name);
1855         if (map || maps->maps_by_name != NULL)
1856                 goto out_unlock;
1857
1858         /* Fallback to traversing the rbtree... */
1859         maps__for_each_entry(maps, map)
1860                 if (strcmp(map->dso->short_name, name) == 0) {
1861                         maps->last_search_by_name = map;
1862                         goto out_unlock;
1863                 }
1864
1865         map = NULL;
1866
1867 out_unlock:
1868         up_read(&maps->lock);
1869         return map;
1870 }
1871
1872 int dso__load_vmlinux(struct dso *dso, struct map *map,
1873                       const char *vmlinux, bool vmlinux_allocated)
1874 {
1875         int err = -1;
1876         struct symsrc ss;
1877         char symfs_vmlinux[PATH_MAX];
1878         enum dso_binary_type symtab_type;
1879
1880         if (vmlinux[0] == '/')
1881                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1882         else
1883                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1884
1885         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1886                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1887         else
1888                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1889
1890         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1891                 return -1;
1892
1893         err = dso__load_sym(dso, map, &ss, &ss, 0);
1894         symsrc__destroy(&ss);
1895
1896         if (err > 0) {
1897                 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1898                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1899                 else
1900                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1901                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1902                 dso__set_loaded(dso);
1903                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1904         }
1905
1906         return err;
1907 }
1908
1909 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1910 {
1911         int i, err = 0;
1912         char *filename = NULL;
1913
1914         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1915                  vmlinux_path__nr_entries + 1);
1916
1917         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1918                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1919                 if (err > 0)
1920                         goto out;
1921         }
1922
1923         if (!symbol_conf.ignore_vmlinux_buildid)
1924                 filename = dso__build_id_filename(dso, NULL, 0, false);
1925         if (filename != NULL) {
1926                 err = dso__load_vmlinux(dso, map, filename, true);
1927                 if (err > 0)
1928                         goto out;
1929                 free(filename);
1930         }
1931 out:
1932         return err;
1933 }
1934
1935 static bool visible_dir_filter(const char *name, struct dirent *d)
1936 {
1937         if (d->d_type != DT_DIR)
1938                 return false;
1939         return lsdir_no_dot_filter(name, d);
1940 }
1941
1942 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1943 {
1944         char kallsyms_filename[PATH_MAX];
1945         int ret = -1;
1946         struct strlist *dirs;
1947         struct str_node *nd;
1948
1949         dirs = lsdir(dir, visible_dir_filter);
1950         if (!dirs)
1951                 return -1;
1952
1953         strlist__for_each_entry(nd, dirs) {
1954                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1955                           "%s/%s/kallsyms", dir, nd->s);
1956                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1957                         strlcpy(dir, kallsyms_filename, dir_sz);
1958                         ret = 0;
1959                         break;
1960                 }
1961         }
1962
1963         strlist__delete(dirs);
1964
1965         return ret;
1966 }
1967
1968 /*
1969  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1970  * since access(R_OK) only checks with real UID/GID but open() use effective
1971  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1972  */
1973 static bool filename__readable(const char *file)
1974 {
1975         int fd = open(file, O_RDONLY);
1976         if (fd < 0)
1977                 return false;
1978         close(fd);
1979         return true;
1980 }
1981
1982 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1983 {
1984         u8 host_build_id[BUILD_ID_SIZE];
1985         char sbuild_id[SBUILD_ID_SIZE];
1986         bool is_host = false;
1987         char path[PATH_MAX];
1988
1989         if (!dso->has_build_id) {
1990                 /*
1991                  * Last resort, if we don't have a build-id and couldn't find
1992                  * any vmlinux file, try the running kernel kallsyms table.
1993                  */
1994                 goto proc_kallsyms;
1995         }
1996
1997         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1998                                  sizeof(host_build_id)) == 0)
1999                 is_host = dso__build_id_equal(dso, host_build_id);
2000
2001         /* Try a fast path for /proc/kallsyms if possible */
2002         if (is_host) {
2003                 /*
2004                  * Do not check the build-id cache, unless we know we cannot use
2005                  * /proc/kcore or module maps don't match to /proc/kallsyms.
2006                  * To check readability of /proc/kcore, do not use access(R_OK)
2007                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
2008                  * can't check it.
2009                  */
2010                 if (filename__readable("/proc/kcore") &&
2011                     !validate_kcore_addresses("/proc/kallsyms", map))
2012                         goto proc_kallsyms;
2013         }
2014
2015         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
2016
2017         /* Find kallsyms in build-id cache with kcore */
2018         scnprintf(path, sizeof(path), "%s/%s/%s",
2019                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
2020
2021         if (!find_matching_kcore(map, path, sizeof(path)))
2022                 return strdup(path);
2023
2024         /* Use current /proc/kallsyms if possible */
2025         if (is_host) {
2026 proc_kallsyms:
2027                 return strdup("/proc/kallsyms");
2028         }
2029
2030         /* Finally, find a cache of kallsyms */
2031         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2032                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2033                        sbuild_id);
2034                 return NULL;
2035         }
2036
2037         return strdup(path);
2038 }
2039
2040 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2041 {
2042         int err;
2043         const char *kallsyms_filename = NULL;
2044         char *kallsyms_allocated_filename = NULL;
2045         /*
2046          * Step 1: if the user specified a kallsyms or vmlinux filename, use
2047          * it and only it, reporting errors to the user if it cannot be used.
2048          *
2049          * For instance, try to analyse an ARM perf.data file _without_ a
2050          * build-id, or if the user specifies the wrong path to the right
2051          * vmlinux file, obviously we can't fallback to another vmlinux (a
2052          * x86_86 one, on the machine where analysis is being performed, say),
2053          * or worse, /proc/kallsyms.
2054          *
2055          * If the specified file _has_ a build-id and there is a build-id
2056          * section in the perf.data file, we will still do the expected
2057          * validation in dso__load_vmlinux and will bail out if they don't
2058          * match.
2059          */
2060         if (symbol_conf.kallsyms_name != NULL) {
2061                 kallsyms_filename = symbol_conf.kallsyms_name;
2062                 goto do_kallsyms;
2063         }
2064
2065         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2066                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2067         }
2068
2069         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2070                 err = dso__load_vmlinux_path(dso, map);
2071                 if (err > 0)
2072                         return err;
2073         }
2074
2075         /* do not try local files if a symfs was given */
2076         if (symbol_conf.symfs[0] != 0)
2077                 return -1;
2078
2079         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2080         if (!kallsyms_allocated_filename)
2081                 return -1;
2082
2083         kallsyms_filename = kallsyms_allocated_filename;
2084
2085 do_kallsyms:
2086         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2087         if (err > 0)
2088                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2089         free(kallsyms_allocated_filename);
2090
2091         if (err > 0 && !dso__is_kcore(dso)) {
2092                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2093                 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2094                 map__fixup_start(map);
2095                 map__fixup_end(map);
2096         }
2097
2098         return err;
2099 }
2100
2101 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2102 {
2103         int err;
2104         const char *kallsyms_filename = NULL;
2105         struct machine *machine = map__kmaps(map)->machine;
2106         char path[PATH_MAX];
2107
2108         if (machine__is_default_guest(machine)) {
2109                 /*
2110                  * if the user specified a vmlinux filename, use it and only
2111                  * it, reporting errors to the user if it cannot be used.
2112                  * Or use file guest_kallsyms inputted by user on commandline
2113                  */
2114                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2115                         err = dso__load_vmlinux(dso, map,
2116                                                 symbol_conf.default_guest_vmlinux_name,
2117                                                 false);
2118                         return err;
2119                 }
2120
2121                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2122                 if (!kallsyms_filename)
2123                         return -1;
2124         } else {
2125                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2126                 kallsyms_filename = path;
2127         }
2128
2129         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2130         if (err > 0)
2131                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2132         if (err > 0 && !dso__is_kcore(dso)) {
2133                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2134                 dso__set_long_name(dso, machine->mmap_name, false);
2135                 map__fixup_start(map);
2136                 map__fixup_end(map);
2137         }
2138
2139         return err;
2140 }
2141
2142 static void vmlinux_path__exit(void)
2143 {
2144         while (--vmlinux_path__nr_entries >= 0)
2145                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2146         vmlinux_path__nr_entries = 0;
2147
2148         zfree(&vmlinux_path);
2149 }
2150
2151 static const char * const vmlinux_paths[] = {
2152         "vmlinux",
2153         "/boot/vmlinux"
2154 };
2155
2156 static const char * const vmlinux_paths_upd[] = {
2157         "/boot/vmlinux-%s",
2158         "/usr/lib/debug/boot/vmlinux-%s",
2159         "/lib/modules/%s/build/vmlinux",
2160         "/usr/lib/debug/lib/modules/%s/vmlinux",
2161         "/usr/lib/debug/boot/vmlinux-%s.debug"
2162 };
2163
2164 static int vmlinux_path__add(const char *new_entry)
2165 {
2166         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2167         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2168                 return -1;
2169         ++vmlinux_path__nr_entries;
2170
2171         return 0;
2172 }
2173
2174 static int vmlinux_path__init(struct perf_env *env)
2175 {
2176         struct utsname uts;
2177         char bf[PATH_MAX];
2178         char *kernel_version;
2179         unsigned int i;
2180
2181         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2182                               ARRAY_SIZE(vmlinux_paths_upd)));
2183         if (vmlinux_path == NULL)
2184                 return -1;
2185
2186         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2187                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2188                         goto out_fail;
2189
2190         /* only try kernel version if no symfs was given */
2191         if (symbol_conf.symfs[0] != 0)
2192                 return 0;
2193
2194         if (env) {
2195                 kernel_version = env->os_release;
2196         } else {
2197                 if (uname(&uts) < 0)
2198                         goto out_fail;
2199
2200                 kernel_version = uts.release;
2201         }
2202
2203         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2204                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2205                 if (vmlinux_path__add(bf) < 0)
2206                         goto out_fail;
2207         }
2208
2209         return 0;
2210
2211 out_fail:
2212         vmlinux_path__exit();
2213         return -1;
2214 }
2215
2216 int setup_list(struct strlist **list, const char *list_str,
2217                       const char *list_name)
2218 {
2219         if (list_str == NULL)
2220                 return 0;
2221
2222         *list = strlist__new(list_str, NULL);
2223         if (!*list) {
2224                 pr_err("problems parsing %s list\n", list_name);
2225                 return -1;
2226         }
2227
2228         symbol_conf.has_filter = true;
2229         return 0;
2230 }
2231
2232 int setup_intlist(struct intlist **list, const char *list_str,
2233                   const char *list_name)
2234 {
2235         if (list_str == NULL)
2236                 return 0;
2237
2238         *list = intlist__new(list_str);
2239         if (!*list) {
2240                 pr_err("problems parsing %s list\n", list_name);
2241                 return -1;
2242         }
2243         return 0;
2244 }
2245
2246 static bool symbol__read_kptr_restrict(void)
2247 {
2248         bool value = false;
2249         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2250
2251         if (fp != NULL) {
2252                 char line[8];
2253
2254                 if (fgets(line, sizeof(line), fp) != NULL)
2255                         value = perf_cap__capable(CAP_SYSLOG) ?
2256                                         (atoi(line) >= 2) :
2257                                         (atoi(line) != 0);
2258
2259                 fclose(fp);
2260         }
2261
2262         /* Per kernel/kallsyms.c:
2263          * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2264          */
2265         if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2266                 value = true;
2267
2268         return value;
2269 }
2270
2271 int symbol__annotation_init(void)
2272 {
2273         if (symbol_conf.init_annotation)
2274                 return 0;
2275
2276         if (symbol_conf.initialized) {
2277                 pr_err("Annotation needs to be init before symbol__init()\n");
2278                 return -1;
2279         }
2280
2281         symbol_conf.priv_size += sizeof(struct annotation);
2282         symbol_conf.init_annotation = true;
2283         return 0;
2284 }
2285
2286 int symbol__init(struct perf_env *env)
2287 {
2288         const char *symfs;
2289
2290         if (symbol_conf.initialized)
2291                 return 0;
2292
2293         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2294
2295         symbol__elf_init();
2296
2297         if (symbol_conf.sort_by_name)
2298                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2299                                           sizeof(struct symbol));
2300
2301         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2302                 return -1;
2303
2304         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2305                 pr_err("'.' is the only non valid --field-separator argument\n");
2306                 return -1;
2307         }
2308
2309         if (setup_list(&symbol_conf.dso_list,
2310                        symbol_conf.dso_list_str, "dso") < 0)
2311                 return -1;
2312
2313         if (setup_list(&symbol_conf.comm_list,
2314                        symbol_conf.comm_list_str, "comm") < 0)
2315                 goto out_free_dso_list;
2316
2317         if (setup_intlist(&symbol_conf.pid_list,
2318                        symbol_conf.pid_list_str, "pid") < 0)
2319                 goto out_free_comm_list;
2320
2321         if (setup_intlist(&symbol_conf.tid_list,
2322                        symbol_conf.tid_list_str, "tid") < 0)
2323                 goto out_free_pid_list;
2324
2325         if (setup_list(&symbol_conf.sym_list,
2326                        symbol_conf.sym_list_str, "symbol") < 0)
2327                 goto out_free_tid_list;
2328
2329         if (setup_list(&symbol_conf.bt_stop_list,
2330                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2331                 goto out_free_sym_list;
2332
2333         /*
2334          * A path to symbols of "/" is identical to ""
2335          * reset here for simplicity.
2336          */
2337         symfs = realpath(symbol_conf.symfs, NULL);
2338         if (symfs == NULL)
2339                 symfs = symbol_conf.symfs;
2340         if (strcmp(symfs, "/") == 0)
2341                 symbol_conf.symfs = "";
2342         if (symfs != symbol_conf.symfs)
2343                 free((void *)symfs);
2344
2345         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2346
2347         symbol_conf.initialized = true;
2348         return 0;
2349
2350 out_free_sym_list:
2351         strlist__delete(symbol_conf.sym_list);
2352 out_free_tid_list:
2353         intlist__delete(symbol_conf.tid_list);
2354 out_free_pid_list:
2355         intlist__delete(symbol_conf.pid_list);
2356 out_free_comm_list:
2357         strlist__delete(symbol_conf.comm_list);
2358 out_free_dso_list:
2359         strlist__delete(symbol_conf.dso_list);
2360         return -1;
2361 }
2362
2363 void symbol__exit(void)
2364 {
2365         if (!symbol_conf.initialized)
2366                 return;
2367         strlist__delete(symbol_conf.bt_stop_list);
2368         strlist__delete(symbol_conf.sym_list);
2369         strlist__delete(symbol_conf.dso_list);
2370         strlist__delete(symbol_conf.comm_list);
2371         intlist__delete(symbol_conf.tid_list);
2372         intlist__delete(symbol_conf.pid_list);
2373         vmlinux_path__exit();
2374         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2375         symbol_conf.bt_stop_list = NULL;
2376         symbol_conf.initialized = false;
2377 }
2378
2379 int symbol__config_symfs(const struct option *opt __maybe_unused,
2380                          const char *dir, int unset __maybe_unused)
2381 {
2382         char *bf = NULL;
2383         int ret;
2384
2385         symbol_conf.symfs = strdup(dir);
2386         if (symbol_conf.symfs == NULL)
2387                 return -ENOMEM;
2388
2389         /* skip the locally configured cache if a symfs is given, and
2390          * config buildid dir to symfs/.debug
2391          */
2392         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2393         if (ret < 0)
2394                 return -ENOMEM;
2395
2396         set_buildid_dir(bf);
2397
2398         free(bf);
2399         return 0;
2400 }
2401
2402 struct mem_info *mem_info__get(struct mem_info *mi)
2403 {
2404         if (mi)
2405                 refcount_inc(&mi->refcnt);
2406         return mi;
2407 }
2408
2409 void mem_info__put(struct mem_info *mi)
2410 {
2411         if (mi && refcount_dec_and_test(&mi->refcnt))
2412                 free(mi);
2413 }
2414
2415 struct mem_info *mem_info__new(void)
2416 {
2417         struct mem_info *mi = zalloc(sizeof(*mi));
2418
2419         if (mi)
2420                 refcount_set(&mi->refcnt, 1);
2421         return mi;
2422 }