tools/perf/util/symbol.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <dirent.h>
   3 #include <errno.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <linux/capability.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mman.h>
  10 #include <linux/string.h>
  11 #include <linux/time64.h>
  12 #include <sys/types.h>
  13 #include <sys/stat.h>
  14 #include <sys/param.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <inttypes.h>
  18 #include "annotate.h"
  19 #include "build-id.h"
  20 #include "cap.h"
  21 #include "dso.h"
  22 #include "util.h" // lsdir()
  23 #include "debug.h"
  24 #include "event.h"
  25 #include "machine.h"
  26 #include "map.h"
  27 #include "symbol.h"
  28 #include "map_symbol.h"
  29 #include "mem-events.h"
  30 #include "symsrc.h"
  31 #include "strlist.h"
  32 #include "intlist.h"
  33 #include "namespaces.h"
  34 #include "header.h"
  35 #include "path.h"
  36 #include <linux/ctype.h>
  37 #include <linux/zalloc.h>
  38
  39 #include <elf.h>
  40 #include <limits.h>
  41 #include <symbol/kallsyms.h>
  42 #include <sys/utsname.h>
  43
  44 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
  45 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
  46 static bool symbol__is_idle(const char *name);
  47
  48 int vmlinux_path__nr_entries;
  49 char **vmlinux_path;
  50
  51 struct symbol_conf symbol_conf = {
  52         .nanosecs               = false,
  53         .use_modules            = true,
  54         .try_vmlinux_path       = true,
  55         .demangle               = true,
  56         .demangle_kernel        = false,
  57         .cumulate_callchain     = true,
  58         .time_quantum           = 100 * NSEC_PER_MSEC, /* 100ms */
  59         .show_hist_headers      = true,
  60         .symfs                  = "",
  61         .event_group            = true,
  62         .inline_name            = true,
  63         .res_sample             = 0,
  64 };
  65
  66 static enum dso_binary_type binary_type_symtab[] = {
  67         DSO_BINARY_TYPE__KALLSYMS,
  68         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  69         DSO_BINARY_TYPE__JAVA_JIT,
  70         DSO_BINARY_TYPE__DEBUGLINK,
  71         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  72         DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
  73         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  74         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  75         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  76         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  77         DSO_BINARY_TYPE__GUEST_KMODULE,
  78         DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  79         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  80         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  81         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  82         DSO_BINARY_TYPE__NOT_FOUND,
  83 };
  84
  85 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  86
  87 static bool symbol_type__filter(char symbol_type)
  88 {
  89         symbol_type = toupper(symbol_type);
  90         return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
  91 }
  92
  93 static int prefix_underscores_count(const char *str)
  94 {
  95         const char *tail = str;
  96
  97         while (*tail == '_')
  98                 tail++;
  99
 100         return tail - str;
 101 }
 102
 103 void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
 104 {
 105         p->end = c->start;
 106 }
 107
 108 const char * __weak arch__normalize_symbol_name(const char *name)
 109 {
 110         return name;
 111 }
 112
 113 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
 114 {
 115         return strcmp(namea, nameb);
 116 }
 117
 118 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
 119                                         unsigned int n)
 120 {
 121         return strncmp(namea, nameb, n);
 122 }
 123
 124 int __weak arch__choose_best_symbol(struct symbol *syma,
 125                                     struct symbol *symb __maybe_unused)
 126 {
 127         /* Avoid "SyS" kernel syscall aliases */
 128         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
 129                 return SYMBOL_B;
 130         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 131                 return SYMBOL_B;
 132
 133         return SYMBOL_A;
 134 }
 135
 136 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 137 {
 138         s64 a;
 139         s64 b;
 140         size_t na, nb;
 141
 142         /* Prefer a symbol with non zero length */
 143         a = syma->end - syma->start;
 144         b = symb->end - symb->start;
 145         if ((b == 0) && (a > 0))
 146                 return SYMBOL_A;
 147         else if ((a == 0) && (b > 0))
 148                 return SYMBOL_B;
 149
 150         /* Prefer a non weak symbol over a weak one */
 151         a = syma->binding == STB_WEAK;
 152         b = symb->binding == STB_WEAK;
 153         if (b && !a)
 154                 return SYMBOL_A;
 155         if (a && !b)
 156                 return SYMBOL_B;
 157
 158         /* Prefer a global symbol over a non global one */
 159         a = syma->binding == STB_GLOBAL;
 160         b = symb->binding == STB_GLOBAL;
 161         if (a && !b)
 162                 return SYMBOL_A;
 163         if (b && !a)
 164                 return SYMBOL_B;
 165
 166         /* Prefer a symbol with less underscores */
 167         a = prefix_underscores_count(syma->name);
 168         b = prefix_underscores_count(symb->name);
 169         if (b > a)
 170                 return SYMBOL_A;
 171         else if (a > b)
 172                 return SYMBOL_B;
 173
 174         /* Choose the symbol with the longest name */
 175         na = strlen(syma->name);
 176         nb = strlen(symb->name);
 177         if (na > nb)
 178                 return SYMBOL_A;
 179         else if (na < nb)
 180                 return SYMBOL_B;
 181
 182         return arch__choose_best_symbol(syma, symb);
 183 }
 184
 185 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
 186 {
 187         struct rb_node *nd;
 188         struct symbol *curr, *next;
 189
 190         if (symbol_conf.allow_aliases)
 191                 return;
 192
 193         nd = rb_first_cached(symbols);
 194
 195         while (nd) {
 196                 curr = rb_entry(nd, struct symbol, rb_node);
 197 again:
 198                 nd = rb_next(&curr->rb_node);
 199                 next = rb_entry(nd, struct symbol, rb_node);
 200
 201                 if (!nd)
 202                         break;
 203
 204                 if (curr->start != next->start)
 205                         continue;
 206
 207                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 208                         rb_erase_cached(&next->rb_node, symbols);
 209                         symbol__delete(next);
 210                         goto again;
 211                 } else {
 212                         nd = rb_next(&curr->rb_node);
 213                         rb_erase_cached(&curr->rb_node, symbols);
 214                         symbol__delete(curr);
 215                 }
 216         }
 217 }
 218
 219 void symbols__fixup_end(struct rb_root_cached *symbols)
 220 {
 221         struct rb_node *nd, *prevnd = rb_first_cached(symbols);
 222         struct symbol *curr, *prev;
 223
 224         if (prevnd == NULL)
 225                 return;
 226
 227         curr = rb_entry(prevnd, struct symbol, rb_node);
 228
 229         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 230                 prev = curr;
 231                 curr = rb_entry(nd, struct symbol, rb_node);
 232
 233                 if (prev->end == prev->start && prev->end != curr->start)
 234                         arch__symbols__fixup_end(prev, curr);
 235         }
 236
 237         /* Last entry */
 238         if (curr->end == curr->start)
 239                 curr->end = roundup(curr->start, 4096) + 4096;
 240 }
 241
 242 void maps__fixup_end(struct maps *maps)
 243 {
 244         struct map *prev = NULL, *curr;
 245
 246         down_write(&maps->lock);
 247
 248         maps__for_each_entry(maps, curr) {
 249                 if (prev != NULL && !prev->end)
 250                         prev->end = curr->start;
 251
 252                 prev = curr;
 253         }
 254
 255         /*
 256          * We still haven't the actual symbols, so guess the
 257          * last map final address.
 258          */
 259         if (curr && !curr->end)
 260                 curr->end = ~0ULL;
 261
 262         up_write(&maps->lock);
 263 }
 264
 265 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
 266 {
 267         size_t namelen = strlen(name) + 1;
 268         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 269                                         sizeof(*sym) + namelen));
 270         if (sym == NULL)
 271                 return NULL;
 272
 273         if (symbol_conf.priv_size) {
 274                 if (symbol_conf.init_annotation) {
 275                         struct annotation *notes = (void *)sym;
 276                         pthread_mutex_init(&notes->lock, NULL);
 277                 }
 278                 sym = ((void *)sym) + symbol_conf.priv_size;
 279         }
 280
 281         sym->start   = start;
 282         sym->end     = len ? start + len : start;
 283         sym->type    = type;
 284         sym->binding = binding;
 285         sym->namelen = namelen - 1;
 286
 287         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 288                   __func__, name, start, sym->end);
 289         memcpy(sym->name, name, namelen);
 290
 291         return sym;
 292 }
 293
 294 void symbol__delete(struct symbol *sym)
 295 {
 296         free(((void *)sym) - symbol_conf.priv_size);
 297 }
 298
 299 void symbols__delete(struct rb_root_cached *symbols)
 300 {
 301         struct symbol *pos;
 302         struct rb_node *next = rb_first_cached(symbols);
 303
 304         while (next) {
 305                 pos = rb_entry(next, struct symbol, rb_node);
 306                 next = rb_next(&pos->rb_node);
 307                 rb_erase_cached(&pos->rb_node, symbols);
 308                 symbol__delete(pos);
 309         }
 310 }
 311
 312 void __symbols__insert(struct rb_root_cached *symbols,
 313                        struct symbol *sym, bool kernel)
 314 {
 315         struct rb_node **p = &symbols->rb_root.rb_node;
 316         struct rb_node *parent = NULL;
 317         const u64 ip = sym->start;
 318         struct symbol *s;
 319         bool leftmost = true;
 320
 321         if (kernel) {
 322                 const char *name = sym->name;
 323                 /*
 324                  * ppc64 uses function descriptors and appends a '.' to the
 325                  * start of every instruction address. Remove it.
 326                  */
 327                 if (name[0] == '.')
 328                         name++;
 329                 sym->idle = symbol__is_idle(name);
 330         }
 331
 332         while (*p != NULL) {
 333                 parent = *p;
 334                 s = rb_entry(parent, struct symbol, rb_node);
 335                 if (ip < s->start)
 336                         p = &(*p)->rb_left;
 337                 else {
 338                         p = &(*p)->rb_right;
 339                         leftmost = false;
 340                 }
 341         }
 342         rb_link_node(&sym->rb_node, parent, p);
 343         rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
 344 }
 345
 346 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
 347 {
 348         __symbols__insert(symbols, sym, false);
 349 }
 350
 351 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
 352 {
 353         struct rb_node *n;
 354
 355         if (symbols == NULL)
 356                 return NULL;
 357
 358         n = symbols->rb_root.rb_node;
 359
 360         while (n) {
 361                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 362
 363                 if (ip < s->start)
 364                         n = n->rb_left;
 365                 else if (ip > s->end || (ip == s->end && ip != s->start))
 366                         n = n->rb_right;
 367                 else
 368                         return s;
 369         }
 370
 371         return NULL;
 372 }
 373
 374 static struct symbol *symbols__first(struct rb_root_cached *symbols)
 375 {
 376         struct rb_node *n = rb_first_cached(symbols);
 377
 378         if (n)
 379                 return rb_entry(n, struct symbol, rb_node);
 380
 381         return NULL;
 382 }
 383
 384 static struct symbol *symbols__last(struct rb_root_cached *symbols)
 385 {
 386         struct rb_node *n = rb_last(&symbols->rb_root);
 387
 388         if (n)
 389                 return rb_entry(n, struct symbol, rb_node);
 390
 391         return NULL;
 392 }
 393
 394 static struct symbol *symbols__next(struct symbol *sym)
 395 {
 396         struct rb_node *n = rb_next(&sym->rb_node);
 397
 398         if (n)
 399                 return rb_entry(n, struct symbol, rb_node);
 400
 401         return NULL;
 402 }
 403
 404 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
 405 {
 406         struct rb_node **p = &symbols->rb_root.rb_node;
 407         struct rb_node *parent = NULL;
 408         struct symbol_name_rb_node *symn, *s;
 409         bool leftmost = true;
 410
 411         symn = container_of(sym, struct symbol_name_rb_node, sym);
 412
 413         while (*p != NULL) {
 414                 parent = *p;
 415                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 416                 if (strcmp(sym->name, s->sym.name) < 0)
 417                         p = &(*p)->rb_left;
 418                 else {
 419                         p = &(*p)->rb_right;
 420                         leftmost = false;
 421                 }
 422         }
 423         rb_link_node(&symn->rb_node, parent, p);
 424         rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
 425 }
 426
 427 static void symbols__sort_by_name(struct rb_root_cached *symbols,
 428                                   struct rb_root_cached *source)
 429 {
 430         struct rb_node *nd;
 431
 432         for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
 433                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 434                 symbols__insert_by_name(symbols, pos);
 435         }
 436 }
 437
 438 int symbol__match_symbol_name(const char *name, const char *str,
 439                               enum symbol_tag_include includes)
 440 {
 441         const char *versioning;
 442
 443         if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
 444             (versioning = strstr(name, "@@"))) {
 445                 int len = strlen(str);
 446
 447                 if (len < versioning - name)
 448                         len = versioning - name;
 449
 450                 return arch__compare_symbol_names_n(name, str, len);
 451         } else
 452                 return arch__compare_symbol_names(name, str);
 453 }
 454
 455 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
 456                                             const char *name,
 457                                             enum symbol_tag_include includes)
 458 {
 459         struct rb_node *n;
 460         struct symbol_name_rb_node *s = NULL;
 461
 462         if (symbols == NULL)
 463                 return NULL;
 464
 465         n = symbols->rb_root.rb_node;
 466
 467         while (n) {
 468                 int cmp;
 469
 470                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 471                 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
 472
 473                 if (cmp > 0)
 474                         n = n->rb_left;
 475                 else if (cmp < 0)
 476                         n = n->rb_right;
 477                 else
 478                         break;
 479         }
 480
 481         if (n == NULL)
 482                 return NULL;
 483
 484         if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
 485                 /* return first symbol that has same name (if any) */
 486                 for (n = rb_prev(n); n; n = rb_prev(n)) {
 487                         struct symbol_name_rb_node *tmp;
 488
 489                         tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 490                         if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
 491                                 break;
 492
 493                         s = tmp;
 494                 }
 495
 496         return &s->sym;
 497 }
 498
 499 void dso__reset_find_symbol_cache(struct dso *dso)
 500 {
 501         dso->last_find_result.addr   = 0;
 502         dso->last_find_result.symbol = NULL;
 503 }
 504
 505 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
 506 {
 507         __symbols__insert(&dso->symbols, sym, dso->kernel);
 508
 509         /* update the symbol cache if necessary */
 510         if (dso->last_find_result.addr >= sym->start &&
 511             (dso->last_find_result.addr < sym->end ||
 512             sym->start == sym->end)) {
 513                 dso->last_find_result.symbol = sym;
 514         }
 515 }
 516
 517 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
 518 {
 519         if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
 520                 dso->last_find_result.addr   = addr;
 521                 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
 522         }
 523
 524         return dso->last_find_result.symbol;
 525 }
 526
 527 struct symbol *dso__first_symbol(struct dso *dso)
 528 {
 529         return symbols__first(&dso->symbols);
 530 }
 531
 532 struct symbol *dso__last_symbol(struct dso *dso)
 533 {
 534         return symbols__last(&dso->symbols);
 535 }
 536
 537 struct symbol *dso__next_symbol(struct symbol *sym)
 538 {
 539         return symbols__next(sym);
 540 }
 541
 542 struct symbol *symbol__next_by_name(struct symbol *sym)
 543 {
 544         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 545         struct rb_node *n = rb_next(&s->rb_node);
 546
 547         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 548 }
 549
 550  /*
 551   * Returns first symbol that matched with @name.
 552   */
 553 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
 554 {
 555         struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
 556                                                  SYMBOL_TAG_INCLUDE__NONE);
 557         if (!s)
 558                 s = symbols__find_by_name(&dso->symbol_names, name,
 559                                           SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
 560         return s;
 561 }
 562
 563 void dso__sort_by_name(struct dso *dso)
 564 {
 565         dso__set_sorted_by_name(dso);
 566         return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
 567 }
 568
 569 int modules__parse(const char *filename, void *arg,
 570                    int (*process_module)(void *arg, const char *name,
 571                                          u64 start, u64 size))
 572 {
 573         char *line = NULL;
 574         size_t n;
 575         FILE *file;
 576         int err = 0;
 577
 578         file = fopen(filename, "r");
 579         if (file == NULL)
 580                 return -1;
 581
 582         while (1) {
 583                 char name[PATH_MAX];
 584                 u64 start, size;
 585                 char *sep, *endptr;
 586                 ssize_t line_len;
 587
 588                 line_len = getline(&line, &n, file);
 589                 if (line_len < 0) {
 590                         if (feof(file))
 591                                 break;
 592                         err = -1;
 593                         goto out;
 594                 }
 595
 596                 if (!line) {
 597                         err = -1;
 598                         goto out;
 599                 }
 600
 601                 line[--line_len] = '\0'; /* \n */
 602
 603                 sep = strrchr(line, 'x');
 604                 if (sep == NULL)
 605                         continue;
 606
 607                 hex2u64(sep + 1, &start);
 608
 609                 sep = strchr(line, ' ');
 610                 if (sep == NULL)
 611                         continue;
 612
 613                 *sep = '\0';
 614
 615                 scnprintf(name, sizeof(name), "[%s]", line);
 616
 617                 size = strtoul(sep + 1, &endptr, 0);
 618                 if (*endptr != ' ' && *endptr != '\t')
 619                         continue;
 620
 621                 err = process_module(arg, name, start, size);
 622                 if (err)
 623                         break;
 624         }
 625 out:
 626         free(line);
 627         fclose(file);
 628         return err;
 629 }
 630
 631 /*
 632  * These are symbols in the kernel image, so make sure that
 633  * sym is from a kernel DSO.
 634  */
 635 static bool symbol__is_idle(const char *name)
 636 {
 637         const char * const idle_symbols[] = {
 638                 "acpi_idle_do_entry",
 639                 "acpi_processor_ffh_cstate_enter",
 640                 "arch_cpu_idle",
 641                 "cpu_idle",
 642                 "cpu_startup_entry",
 643                 "idle_cpu",
 644                 "intel_idle",
 645                 "default_idle",
 646                 "native_safe_halt",
 647                 "enter_idle",
 648                 "exit_idle",
 649                 "mwait_idle",
 650                 "mwait_idle_with_hints",
 651                 "poll_idle",
 652                 "ppc64_runlatch_off",
 653                 "pseries_dedicated_idle_sleep",
 654                 NULL
 655         };
 656         int i;
 657         static struct strlist *idle_symbols_list;
 658
 659         if (idle_symbols_list)
 660                 return strlist__has_entry(idle_symbols_list, name);
 661
 662         idle_symbols_list = strlist__new(NULL, NULL);
 663
 664         for (i = 0; idle_symbols[i]; i++)
 665                 strlist__add(idle_symbols_list, idle_symbols[i]);
 666
 667         return strlist__has_entry(idle_symbols_list, name);
 668 }
 669
 670 static int map__process_kallsym_symbol(void *arg, const char *name,
 671                                        char type, u64 start)
 672 {
 673         struct symbol *sym;
 674         struct dso *dso = arg;
 675         struct rb_root_cached *root = &dso->symbols;
 676
 677         if (!symbol_type__filter(type))
 678                 return 0;
 679
 680         /*
 681          * module symbols are not sorted so we add all
 682          * symbols, setting length to 0, and rely on
 683          * symbols__fixup_end() to fix it up.
 684          */
 685         sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 686         if (sym == NULL)
 687                 return -ENOMEM;
 688         /*
 689          * We will pass the symbols to the filter later, in
 690          * map__split_kallsyms, when we have split the maps per module
 691          */
 692         __symbols__insert(root, sym, !strchr(name, '['));
 693
 694         return 0;
 695 }
 696
 697 /*
 698  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 699  * so that we can in the next step set the symbol ->end address and then
 700  * call kernel_maps__split_kallsyms.
 701  */
 702 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 703 {
 704         return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 705 }
 706
 707 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
 708 {
 709         struct map *curr_map;
 710         struct symbol *pos;
 711         int count = 0;
 712         struct rb_root_cached old_root = dso->symbols;
 713         struct rb_root_cached *root = &dso->symbols;
 714         struct rb_node *next = rb_first_cached(root);
 715
 716         if (!kmaps)
 717                 return -1;
 718
 719         *root = RB_ROOT_CACHED;
 720
 721         while (next) {
 722                 char *module;
 723
 724                 pos = rb_entry(next, struct symbol, rb_node);
 725                 next = rb_next(&pos->rb_node);
 726
 727                 rb_erase_cached(&pos->rb_node, &old_root);
 728                 RB_CLEAR_NODE(&pos->rb_node);
 729                 module = strchr(pos->name, '\t');
 730                 if (module)
 731                         *module = '\0';
 732
 733                 curr_map = maps__find(kmaps, pos->start);
 734
 735                 if (!curr_map) {
 736                         symbol__delete(pos);
 737                         continue;
 738                 }
 739
 740                 pos->start -= curr_map->start - curr_map->pgoff;
 741                 if (pos->end > curr_map->end)
 742                         pos->end = curr_map->end;
 743                 if (pos->end)
 744                         pos->end -= curr_map->start - curr_map->pgoff;
 745                 symbols__insert(&curr_map->dso->symbols, pos);
 746                 ++count;
 747         }
 748
 749         /* Symbols have been adjusted */
 750         dso->adjust_symbols = 1;
 751
 752         return count;
 753 }
 754
 755 /*
 756  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 757  * kernel range is broken in several maps, named [kernel].N, as we don't have
 758  * the original ELF section names vmlinux have.
 759  */
 760 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 761                                 struct map *initial_map)
 762 {
 763         struct machine *machine;
 764         struct map *curr_map = initial_map;
 765         struct symbol *pos;
 766         int count = 0, moved = 0;
 767         struct rb_root_cached *root = &dso->symbols;
 768         struct rb_node *next = rb_first_cached(root);
 769         int kernel_range = 0;
 770         bool x86_64;
 771
 772         if (!kmaps)
 773                 return -1;
 774
 775         machine = kmaps->machine;
 776
 777         x86_64 = machine__is(machine, "x86_64");
 778
 779         while (next) {
 780                 char *module;
 781
 782                 pos = rb_entry(next, struct symbol, rb_node);
 783                 next = rb_next(&pos->rb_node);
 784
 785                 module = strchr(pos->name, '\t');
 786                 if (module) {
 787                         if (!symbol_conf.use_modules)
 788                                 goto discard_symbol;
 789
 790                         *module++ = '\0';
 791
 792                         if (strcmp(curr_map->dso->short_name, module)) {
 793                                 if (curr_map != initial_map &&
 794                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 795                                     machine__is_default_guest(machine)) {
 796                                         /*
 797                                          * We assume all symbols of a module are
 798                                          * continuous in * kallsyms, so curr_map
 799                                          * points to a module and all its
 800                                          * symbols are in its kmap. Mark it as
 801                                          * loaded.
 802                                          */
 803                                         dso__set_loaded(curr_map->dso);
 804                                 }
 805
 806                                 curr_map = maps__find_by_name(kmaps, module);
 807                                 if (curr_map == NULL) {
 808                                         pr_debug("%s/proc/{kallsyms,modules} "
 809                                                  "inconsistency while looking "
 810                                                  "for \"%s\" module!\n",
 811                                                  machine->root_dir, module);
 812                                         curr_map = initial_map;
 813                                         goto discard_symbol;
 814                                 }
 815
 816                                 if (curr_map->dso->loaded &&
 817                                     !machine__is_default_guest(machine))
 818                                         goto discard_symbol;
 819                         }
 820                         /*
 821                          * So that we look just like we get from .ko files,
 822                          * i.e. not prelinked, relative to initial_map->start.
 823                          */
 824                         pos->start = curr_map->map_ip(curr_map, pos->start);
 825                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 826                 } else if (x86_64 && is_entry_trampoline(pos->name)) {
 827                         /*
 828                          * These symbols are not needed anymore since the
 829                          * trampoline maps refer to the text section and it's
 830                          * symbols instead. Avoid having to deal with
 831                          * relocations, and the assumption that the first symbol
 832                          * is the start of kernel text, by simply removing the
 833                          * symbols at this point.
 834                          */
 835                         goto discard_symbol;
 836                 } else if (curr_map != initial_map) {
 837                         char dso_name[PATH_MAX];
 838                         struct dso *ndso;
 839
 840                         if (delta) {
 841                                 /* Kernel was relocated at boot time */
 842                                 pos->start -= delta;
 843                                 pos->end -= delta;
 844                         }
 845
 846                         if (count == 0) {
 847                                 curr_map = initial_map;
 848                                 goto add_symbol;
 849                         }
 850
 851                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 852                                 snprintf(dso_name, sizeof(dso_name),
 853                                         "[guest.kernel].%d",
 854                                         kernel_range++);
 855                         else
 856                                 snprintf(dso_name, sizeof(dso_name),
 857                                         "[kernel].%d",
 858                                         kernel_range++);
 859
 860                         ndso = dso__new(dso_name);
 861                         if (ndso == NULL)
 862                                 return -1;
 863
 864                         ndso->kernel = dso->kernel;
 865
 866                         curr_map = map__new2(pos->start, ndso);
 867                         if (curr_map == NULL) {
 868                                 dso__put(ndso);
 869                                 return -1;
 870                         }
 871
 872                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 873                         maps__insert(kmaps, curr_map);
 874                         ++kernel_range;
 875                 } else if (delta) {
 876                         /* Kernel was relocated at boot time */
 877                         pos->start -= delta;
 878                         pos->end -= delta;
 879                 }
 880 add_symbol:
 881                 if (curr_map != initial_map) {
 882                         rb_erase_cached(&pos->rb_node, root);
 883                         symbols__insert(&curr_map->dso->symbols, pos);
 884                         ++moved;
 885                 } else
 886                         ++count;
 887
 888                 continue;
 889 discard_symbol:
 890                 rb_erase_cached(&pos->rb_node, root);
 891                 symbol__delete(pos);
 892         }
 893
 894         if (curr_map != initial_map &&
 895             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 896             machine__is_default_guest(kmaps->machine)) {
 897                 dso__set_loaded(curr_map->dso);
 898         }
 899
 900         return count + moved;
 901 }
 902
 903 bool symbol__restricted_filename(const char *filename,
 904                                  const char *restricted_filename)
 905 {
 906         bool restricted = false;
 907
 908         if (symbol_conf.kptr_restrict) {
 909                 char *r = realpath(filename, NULL);
 910
 911                 if (r != NULL) {
 912                         restricted = strcmp(r, restricted_filename) == 0;
 913                         free(r);
 914                         return restricted;
 915                 }
 916         }
 917
 918         return restricted;
 919 }
 920
 921 struct module_info {
 922         struct rb_node rb_node;
 923         char *name;
 924         u64 start;
 925 };
 926
 927 static void add_module(struct module_info *mi, struct rb_root *modules)
 928 {
 929         struct rb_node **p = &modules->rb_node;
 930         struct rb_node *parent = NULL;
 931         struct module_info *m;
 932
 933         while (*p != NULL) {
 934                 parent = *p;
 935                 m = rb_entry(parent, struct module_info, rb_node);
 936                 if (strcmp(mi->name, m->name) < 0)
 937                         p = &(*p)->rb_left;
 938                 else
 939                         p = &(*p)->rb_right;
 940         }
 941         rb_link_node(&mi->rb_node, parent, p);
 942         rb_insert_color(&mi->rb_node, modules);
 943 }
 944
 945 static void delete_modules(struct rb_root *modules)
 946 {
 947         struct module_info *mi;
 948         struct rb_node *next = rb_first(modules);
 949
 950         while (next) {
 951                 mi = rb_entry(next, struct module_info, rb_node);
 952                 next = rb_next(&mi->rb_node);
 953                 rb_erase(&mi->rb_node, modules);
 954                 zfree(&mi->name);
 955                 free(mi);
 956         }
 957 }
 958
 959 static struct module_info *find_module(const char *name,
 960                                        struct rb_root *modules)
 961 {
 962         struct rb_node *n = modules->rb_node;
 963
 964         while (n) {
 965                 struct module_info *m;
 966                 int cmp;
 967
 968                 m = rb_entry(n, struct module_info, rb_node);
 969                 cmp = strcmp(name, m->name);
 970                 if (cmp < 0)
 971                         n = n->rb_left;
 972                 else if (cmp > 0)
 973                         n = n->rb_right;
 974                 else
 975                         return m;
 976         }
 977
 978         return NULL;
 979 }
 980
 981 static int __read_proc_modules(void *arg, const char *name, u64 start,
 982                                u64 size __maybe_unused)
 983 {
 984         struct rb_root *modules = arg;
 985         struct module_info *mi;
 986
 987         mi = zalloc(sizeof(struct module_info));
 988         if (!mi)
 989                 return -ENOMEM;
 990
 991         mi->name = strdup(name);
 992         mi->start = start;
 993
 994         if (!mi->name) {
 995                 free(mi);
 996                 return -ENOMEM;
 997         }
 998
 999         add_module(mi, modules);
1000
1001         return 0;
1002 }
1003
1004 static int read_proc_modules(const char *filename, struct rb_root *modules)
1005 {
1006         if (symbol__restricted_filename(filename, "/proc/modules"))
1007                 return -1;
1008
1009         if (modules__parse(filename, modules, __read_proc_modules)) {
1010                 delete_modules(modules);
1011                 return -1;
1012         }
1013
1014         return 0;
1015 }
1016
1017 int compare_proc_modules(const char *from, const char *to)
1018 {
1019         struct rb_root from_modules = RB_ROOT;
1020         struct rb_root to_modules = RB_ROOT;
1021         struct rb_node *from_node, *to_node;
1022         struct module_info *from_m, *to_m;
1023         int ret = -1;
1024
1025         if (read_proc_modules(from, &from_modules))
1026                 return -1;
1027
1028         if (read_proc_modules(to, &to_modules))
1029                 goto out_delete_from;
1030
1031         from_node = rb_first(&from_modules);
1032         to_node = rb_first(&to_modules);
1033         while (from_node) {
1034                 if (!to_node)
1035                         break;
1036
1037                 from_m = rb_entry(from_node, struct module_info, rb_node);
1038                 to_m = rb_entry(to_node, struct module_info, rb_node);
1039
1040                 if (from_m->start != to_m->start ||
1041                     strcmp(from_m->name, to_m->name))
1042                         break;
1043
1044                 from_node = rb_next(from_node);
1045                 to_node = rb_next(to_node);
1046         }
1047
1048         if (!from_node && !to_node)
1049                 ret = 0;
1050
1051         delete_modules(&to_modules);
1052 out_delete_from:
1053         delete_modules(&from_modules);
1054
1055         return ret;
1056 }
1057
1058 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1059 {
1060         struct rb_root modules = RB_ROOT;
1061         struct map *old_map;
1062         int err;
1063
1064         err = read_proc_modules(filename, &modules);
1065         if (err)
1066                 return err;
1067
1068         maps__for_each_entry(kmaps, old_map) {
1069                 struct module_info *mi;
1070
1071                 if (!__map__is_kmodule(old_map)) {
1072                         continue;
1073                 }
1074
1075                 /* Module must be in memory at the same address */
1076                 mi = find_module(old_map->dso->short_name, &modules);
1077                 if (!mi || mi->start != old_map->start) {
1078                         err = -EINVAL;
1079                         goto out;
1080                 }
1081         }
1082 out:
1083         delete_modules(&modules);
1084         return err;
1085 }
1086
1087 /*
1088  * If kallsyms is referenced by name then we look for filename in the same
1089  * directory.
1090  */
1091 static bool filename_from_kallsyms_filename(char *filename,
1092                                             const char *base_name,
1093                                             const char *kallsyms_filename)
1094 {
1095         char *name;
1096
1097         strcpy(filename, kallsyms_filename);
1098         name = strrchr(filename, '/');
1099         if (!name)
1100                 return false;
1101
1102         name += 1;
1103
1104         if (!strcmp(name, "kallsyms")) {
1105                 strcpy(name, base_name);
1106                 return true;
1107         }
1108
1109         return false;
1110 }
1111
1112 static int validate_kcore_modules(const char *kallsyms_filename,
1113                                   struct map *map)
1114 {
1115         struct maps *kmaps = map__kmaps(map);
1116         char modules_filename[PATH_MAX];
1117
1118         if (!kmaps)
1119                 return -EINVAL;
1120
1121         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1122                                              kallsyms_filename))
1123                 return -EINVAL;
1124
1125         if (do_validate_kcore_modules(modules_filename, kmaps))
1126                 return -EINVAL;
1127
1128         return 0;
1129 }
1130
1131 static int validate_kcore_addresses(const char *kallsyms_filename,
1132                                     struct map *map)
1133 {
1134         struct kmap *kmap = map__kmap(map);
1135
1136         if (!kmap)
1137                 return -EINVAL;
1138
1139         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1140                 u64 start;
1141
1142                 if (kallsyms__get_function_start(kallsyms_filename,
1143                                                  kmap->ref_reloc_sym->name, &start))
1144                         return -ENOENT;
1145                 if (start != kmap->ref_reloc_sym->addr)
1146                         return -EINVAL;
1147         }
1148
1149         return validate_kcore_modules(kallsyms_filename, map);
1150 }
1151
1152 struct kcore_mapfn_data {
1153         struct dso *dso;
1154         struct list_head maps;
1155 };
1156
1157 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1158 {
1159         struct kcore_mapfn_data *md = data;
1160         struct map *map;
1161
1162         map = map__new2(start, md->dso);
1163         if (map == NULL)
1164                 return -ENOMEM;
1165
1166         map->end = map->start + len;
1167         map->pgoff = pgoff;
1168
1169         list_add(&map->node, &md->maps);
1170
1171         return 0;
1172 }
1173
1174 /*
1175  * Merges map into maps by splitting the new map within the existing map
1176  * regions.
1177  */
1178 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1179 {
1180         struct map *old_map;
1181         LIST_HEAD(merged);
1182
1183         maps__for_each_entry(kmaps, old_map) {
1184                 /* no overload with this one */
1185                 if (new_map->end < old_map->start ||
1186                     new_map->start >= old_map->end)
1187                         continue;
1188
1189                 if (new_map->start < old_map->start) {
1190                         /*
1191                          * |new......
1192                          *       |old....
1193                          */
1194                         if (new_map->end < old_map->end) {
1195                                 /*
1196                                  * |new......|     -> |new..|
1197                                  *       |old....| ->       |old....|
1198                                  */
1199                                 new_map->end = old_map->start;
1200                         } else {
1201                                 /*
1202                                  * |new.............| -> |new..|       |new..|
1203                                  *       |old....|    ->       |old....|
1204                                  */
1205                                 struct map *m = map__clone(new_map);
1206
1207                                 if (!m)
1208                                         return -ENOMEM;
1209
1210                                 m->end = old_map->start;
1211                                 list_add_tail(&m->node, &merged);
1212                                 new_map->start = old_map->end;
1213                         }
1214                 } else {
1215                         /*
1216                          *      |new......
1217                          * |old....
1218                          */
1219                         if (new_map->end < old_map->end) {
1220                                 /*
1221                                  *      |new..|   -> x
1222                                  * |old.........| -> |old.........|
1223                                  */
1224                                 map__put(new_map);
1225                                 new_map = NULL;
1226                                 break;
1227                         } else {
1228                                 /*
1229                                  *      |new......| ->         |new...|
1230                                  * |old....|        -> |old....|
1231                                  */
1232                                 new_map->start = old_map->end;
1233                         }
1234                 }
1235         }
1236
1237         while (!list_empty(&merged)) {
1238                 old_map = list_entry(merged.next, struct map, node);
1239                 list_del_init(&old_map->node);
1240                 maps__insert(kmaps, old_map);
1241                 map__put(old_map);
1242         }
1243
1244         if (new_map) {
1245                 maps__insert(kmaps, new_map);
1246                 map__put(new_map);
1247         }
1248         return 0;
1249 }
1250
1251 static int dso__load_kcore(struct dso *dso, struct map *map,
1252                            const char *kallsyms_filename)
1253 {
1254         struct maps *kmaps = map__kmaps(map);
1255         struct kcore_mapfn_data md;
1256         struct map *old_map, *new_map, *replacement_map = NULL, *next;
1257         struct machine *machine;
1258         bool is_64_bit;
1259         int err, fd;
1260         char kcore_filename[PATH_MAX];
1261         u64 stext;
1262
1263         if (!kmaps)
1264                 return -EINVAL;
1265
1266         machine = kmaps->machine;
1267
1268         /* This function requires that the map is the kernel map */
1269         if (!__map__is_kernel(map))
1270                 return -EINVAL;
1271
1272         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1273                                              kallsyms_filename))
1274                 return -EINVAL;
1275
1276         /* Modules and kernel must be present at their original addresses */
1277         if (validate_kcore_addresses(kallsyms_filename, map))
1278                 return -EINVAL;
1279
1280         md.dso = dso;
1281         INIT_LIST_HEAD(&md.maps);
1282
1283         fd = open(kcore_filename, O_RDONLY);
1284         if (fd < 0) {
1285                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1286                          kcore_filename);
1287                 return -EINVAL;
1288         }
1289
1290         /* Read new maps into temporary lists */
1291         err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1292                               &is_64_bit);
1293         if (err)
1294                 goto out_err;
1295         dso->is_64_bit = is_64_bit;
1296
1297         if (list_empty(&md.maps)) {
1298                 err = -EINVAL;
1299                 goto out_err;
1300         }
1301
1302         /* Remove old maps */
1303         maps__for_each_entry_safe(kmaps, old_map, next) {
1304                 /*
1305                  * We need to preserve eBPF maps even if they are
1306                  * covered by kcore, because we need to access
1307                  * eBPF dso for source data.
1308                  */
1309                 if (old_map != map && !__map__is_bpf_prog(old_map))
1310                         maps__remove(kmaps, old_map);
1311         }
1312         machine->trampolines_mapped = false;
1313
1314         /* Find the kernel map using the '_stext' symbol */
1315         if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1316                 list_for_each_entry(new_map, &md.maps, node) {
1317                         if (stext >= new_map->start && stext < new_map->end) {
1318                                 replacement_map = new_map;
1319                                 break;
1320                         }
1321                 }
1322         }
1323
1324         if (!replacement_map)
1325                 replacement_map = list_entry(md.maps.next, struct map, node);
1326
1327         /* Add new maps */
1328         while (!list_empty(&md.maps)) {
1329                 new_map = list_entry(md.maps.next, struct map, node);
1330                 list_del_init(&new_map->node);
1331                 if (new_map == replacement_map) {
1332                         map->start      = new_map->start;
1333                         map->end        = new_map->end;
1334                         map->pgoff      = new_map->pgoff;
1335                         map->map_ip     = new_map->map_ip;
1336                         map->unmap_ip   = new_map->unmap_ip;
1337                         /* Ensure maps are correctly ordered */
1338                         map__get(map);
1339                         maps__remove(kmaps, map);
1340                         maps__insert(kmaps, map);
1341                         map__put(map);
1342                         map__put(new_map);
1343                 } else {
1344                         /*
1345                          * Merge kcore map into existing maps,
1346                          * and ensure that current maps (eBPF)
1347                          * stay intact.
1348                          */
1349                         if (maps__merge_in(kmaps, new_map))
1350                                 goto out_err;
1351                 }
1352         }
1353
1354         if (machine__is(machine, "x86_64")) {
1355                 u64 addr;
1356
1357                 /*
1358                  * If one of the corresponding symbols is there, assume the
1359                  * entry trampoline maps are too.
1360                  */
1361                 if (!kallsyms__get_function_start(kallsyms_filename,
1362                                                   ENTRY_TRAMPOLINE_NAME,
1363                                                   &addr))
1364                         machine->trampolines_mapped = true;
1365         }
1366
1367         /*
1368          * Set the data type and long name so that kcore can be read via
1369          * dso__data_read_addr().
1370          */
1371         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1372                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1373         else
1374                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1375         dso__set_long_name(dso, strdup(kcore_filename), true);
1376
1377         close(fd);
1378
1379         if (map->prot & PROT_EXEC)
1380                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1381         else
1382                 pr_debug("Using %s for kernel data\n", kcore_filename);
1383
1384         return 0;
1385
1386 out_err:
1387         while (!list_empty(&md.maps)) {
1388                 map = list_entry(md.maps.next, struct map, node);
1389                 list_del_init(&map->node);
1390                 map__put(map);
1391         }
1392         close(fd);
1393         return -EINVAL;
1394 }
1395
1396 /*
1397  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1398  * delta based on the relocation reference symbol.
1399  */
1400 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1401 {
1402         u64 addr;
1403
1404         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1405                 return 0;
1406
1407         if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1408                 return -1;
1409
1410         *delta = addr - kmap->ref_reloc_sym->addr;
1411         return 0;
1412 }
1413
1414 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1415                          struct map *map, bool no_kcore)
1416 {
1417         struct kmap *kmap = map__kmap(map);
1418         u64 delta = 0;
1419
1420         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1421                 return -1;
1422
1423         if (!kmap || !kmap->kmaps)
1424                 return -1;
1425
1426         if (dso__load_all_kallsyms(dso, filename) < 0)
1427                 return -1;
1428
1429         if (kallsyms__delta(kmap, filename, &delta))
1430                 return -1;
1431
1432         symbols__fixup_end(&dso->symbols);
1433         symbols__fixup_duplicate(&dso->symbols);
1434
1435         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1436                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1437         else
1438                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1439
1440         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1441                 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1442         else
1443                 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1444 }
1445
1446 int dso__load_kallsyms(struct dso *dso, const char *filename,
1447                        struct map *map)
1448 {
1449         return __dso__load_kallsyms(dso, filename, map, false);
1450 }
1451
1452 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1453 {
1454         char *line = NULL;
1455         size_t n;
1456         FILE *file;
1457         int nr_syms = 0;
1458
1459         file = fopen(map_path, "r");
1460         if (file == NULL)
1461                 goto out_failure;
1462
1463         while (!feof(file)) {
1464                 u64 start, size;
1465                 struct symbol *sym;
1466                 int line_len, len;
1467
1468                 line_len = getline(&line, &n, file);
1469                 if (line_len < 0)
1470                         break;
1471
1472                 if (!line)
1473                         goto out_failure;
1474
1475                 line[--line_len] = '\0'; /* \n */
1476
1477                 len = hex2u64(line, &start);
1478
1479                 len++;
1480                 if (len + 2 >= line_len)
1481                         continue;
1482
1483                 len += hex2u64(line + len, &size);
1484
1485                 len++;
1486                 if (len + 2 >= line_len)
1487                         continue;
1488
1489                 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1490
1491                 if (sym == NULL)
1492                         goto out_delete_line;
1493
1494                 symbols__insert(&dso->symbols, sym);
1495                 nr_syms++;
1496         }
1497
1498         free(line);
1499         fclose(file);
1500
1501         return nr_syms;
1502
1503 out_delete_line:
1504         free(line);
1505 out_failure:
1506         return -1;
1507 }
1508
1509 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1510                                            enum dso_binary_type type)
1511 {
1512         switch (type) {
1513         case DSO_BINARY_TYPE__JAVA_JIT:
1514         case DSO_BINARY_TYPE__DEBUGLINK:
1515         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1516         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1517         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1518         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1519         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1520                 return !kmod && dso->kernel == DSO_TYPE_USER;
1521
1522         case DSO_BINARY_TYPE__KALLSYMS:
1523         case DSO_BINARY_TYPE__VMLINUX:
1524         case DSO_BINARY_TYPE__KCORE:
1525                 return dso->kernel == DSO_TYPE_KERNEL;
1526
1527         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1528         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1529         case DSO_BINARY_TYPE__GUEST_KCORE:
1530                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1531
1532         case DSO_BINARY_TYPE__GUEST_KMODULE:
1533         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1534         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1535         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1536                 /*
1537                  * kernel modules know their symtab type - it's set when
1538                  * creating a module dso in machine__addnew_module_map().
1539                  */
1540                 return kmod && dso->symtab_type == type;
1541
1542         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1543         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1544                 return true;
1545
1546         case DSO_BINARY_TYPE__BPF_PROG_INFO:
1547         case DSO_BINARY_TYPE__NOT_FOUND:
1548         default:
1549                 return false;
1550         }
1551 }
1552
1553 /* Checks for the existence of the perf-<pid>.map file in two different
1554  * locations.  First, if the process is a separate mount namespace, check in
1555  * that namespace using the pid of the innermost pid namespace.  If's not in a
1556  * namespace, or the file can't be found there, try in the mount namespace of
1557  * the tracing process using our view of its pid.
1558  */
1559 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1560                               struct nsinfo **nsip)
1561 {
1562         struct nscookie nsc;
1563         struct nsinfo *nsi;
1564         struct nsinfo *nnsi;
1565         int rc = -1;
1566
1567         nsi = *nsip;
1568
1569         if (nsi->need_setns) {
1570                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1571                 nsinfo__mountns_enter(nsi, &nsc);
1572                 rc = access(filebuf, R_OK);
1573                 nsinfo__mountns_exit(&nsc);
1574                 if (rc == 0)
1575                         return rc;
1576         }
1577
1578         nnsi = nsinfo__copy(nsi);
1579         if (nnsi) {
1580                 nsinfo__put(nsi);
1581
1582                 nnsi->need_setns = false;
1583                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1584                 *nsip = nnsi;
1585                 rc = 0;
1586         }
1587
1588         return rc;
1589 }
1590
1591 int dso__load(struct dso *dso, struct map *map)
1592 {
1593         char *name;
1594         int ret = -1;
1595         u_int i;
1596         struct machine *machine = NULL;
1597         char *root_dir = (char *) "";
1598         int ss_pos = 0;
1599         struct symsrc ss_[2];
1600         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1601         bool kmod;
1602         bool perfmap;
1603         unsigned char build_id[BUILD_ID_SIZE];
1604         struct nscookie nsc;
1605         char newmapname[PATH_MAX];
1606         const char *map_path = dso->long_name;
1607
1608         perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1609         if (perfmap) {
1610                 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1611                     sizeof(newmapname), &dso->nsinfo) == 0)) {
1612                         map_path = newmapname;
1613                 }
1614         }
1615
1616         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1617         pthread_mutex_lock(&dso->lock);
1618
1619         /* check again under the dso->lock */
1620         if (dso__loaded(dso)) {
1621                 ret = 1;
1622                 goto out;
1623         }
1624
1625         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1626                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1627                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1628                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1629
1630         if (dso->kernel && !kmod) {
1631                 if (dso->kernel == DSO_TYPE_KERNEL)
1632                         ret = dso__load_kernel_sym(dso, map);
1633                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1634                         ret = dso__load_guest_kernel_sym(dso, map);
1635
1636                 machine = map__kmaps(map)->machine;
1637                 if (machine__is(machine, "x86_64"))
1638                         machine__map_x86_64_entry_trampolines(machine, dso);
1639                 goto out;
1640         }
1641
1642         dso->adjust_symbols = 0;
1643
1644         if (perfmap) {
1645                 ret = dso__load_perf_map(map_path, dso);
1646                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1647                                              DSO_BINARY_TYPE__NOT_FOUND;
1648                 goto out;
1649         }
1650
1651         if (machine)
1652                 root_dir = machine->root_dir;
1653
1654         name = malloc(PATH_MAX);
1655         if (!name)
1656                 goto out;
1657
1658         /*
1659          * Read the build id if possible. This is required for
1660          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1661          */
1662         if (!dso->has_build_id &&
1663             is_regular_file(dso->long_name)) {
1664             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1665             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1666                 dso__set_build_id(dso, build_id);
1667         }
1668
1669         /*
1670          * Iterate over candidate debug images.
1671          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1672          * and/or opd section) for processing.
1673          */
1674         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1675                 struct symsrc *ss = &ss_[ss_pos];
1676                 bool next_slot = false;
1677                 bool is_reg;
1678                 bool nsexit;
1679                 int sirc = -1;
1680
1681                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1682
1683                 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1684                     symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1685
1686                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1687                         continue;
1688
1689                 if (dso__read_binary_type_filename(dso, symtab_type,
1690                                                    root_dir, name, PATH_MAX))
1691                         continue;
1692
1693                 if (nsexit)
1694                         nsinfo__mountns_exit(&nsc);
1695
1696                 is_reg = is_regular_file(name);
1697                 if (is_reg)
1698                         sirc = symsrc__init(ss, dso, name, symtab_type);
1699
1700                 if (nsexit)
1701                         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1702
1703                 if (!is_reg || sirc < 0)
1704                         continue;
1705
1706                 if (!syms_ss && symsrc__has_symtab(ss)) {
1707                         syms_ss = ss;
1708                         next_slot = true;
1709                         if (!dso->symsrc_filename)
1710                                 dso->symsrc_filename = strdup(name);
1711                 }
1712
1713                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1714                         runtime_ss = ss;
1715                         next_slot = true;
1716                 }
1717
1718                 if (next_slot) {
1719                         ss_pos++;
1720
1721                         if (syms_ss && runtime_ss)
1722                                 break;
1723                 } else {
1724                         symsrc__destroy(ss);
1725                 }
1726
1727         }
1728
1729         if (!runtime_ss && !syms_ss)
1730                 goto out_free;
1731
1732         if (runtime_ss && !syms_ss) {
1733                 syms_ss = runtime_ss;
1734         }
1735
1736         /* We'll have to hope for the best */
1737         if (!runtime_ss && syms_ss)
1738                 runtime_ss = syms_ss;
1739
1740         if (syms_ss)
1741                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1742         else
1743                 ret = -1;
1744
1745         if (ret > 0) {
1746                 int nr_plt;
1747
1748                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1749                 if (nr_plt > 0)
1750                         ret += nr_plt;
1751         }
1752
1753         for (; ss_pos > 0; ss_pos--)
1754                 symsrc__destroy(&ss_[ss_pos - 1]);
1755 out_free:
1756         free(name);
1757         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1758                 ret = 0;
1759 out:
1760         dso__set_loaded(dso);
1761         pthread_mutex_unlock(&dso->lock);
1762         nsinfo__mountns_exit(&nsc);
1763
1764         return ret;
1765 }
1766
1767 static int map__strcmp(const void *a, const void *b)
1768 {
1769         const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1770         return strcmp(ma->dso->short_name, mb->dso->short_name);
1771 }
1772
1773 static int map__strcmp_name(const void *name, const void *b)
1774 {
1775         const struct map *map = *(const struct map **)b;
1776         return strcmp(name, map->dso->short_name);
1777 }
1778
1779 void __maps__sort_by_name(struct maps *maps)
1780 {
1781         qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1782 }
1783
1784 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1785 {
1786         struct map *map;
1787         struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1788         int i = 0;
1789
1790         if (maps_by_name == NULL)
1791                 return -1;
1792
1793         maps->maps_by_name = maps_by_name;
1794         maps->nr_maps_allocated = maps->nr_maps;
1795
1796         maps__for_each_entry(maps, map)
1797                 maps_by_name[i++] = map;
1798
1799         __maps__sort_by_name(maps);
1800         return 0;
1801 }
1802
1803 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1804 {
1805         struct map **mapp;
1806
1807         if (maps->maps_by_name == NULL &&
1808             map__groups__sort_by_name_from_rbtree(maps))
1809                 return NULL;
1810
1811         mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1812         if (mapp)
1813                 return *mapp;
1814         return NULL;
1815 }
1816
1817 struct map *maps__find_by_name(struct maps *maps, const char *name)
1818 {
1819         struct map *map;
1820
1821         down_read(&maps->lock);
1822
1823         if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1824                 map = maps->last_search_by_name;
1825                 goto out_unlock;
1826         }
1827         /*
1828          * If we have maps->maps_by_name, then the name isn't in the rbtree,
1829          * as maps->maps_by_name mirrors the rbtree when lookups by name are
1830          * made.
1831          */
1832         map = __maps__find_by_name(maps, name);
1833         if (map || maps->maps_by_name != NULL)
1834                 goto out_unlock;
1835
1836         /* Fallback to traversing the rbtree... */
1837         maps__for_each_entry(maps, map)
1838                 if (strcmp(map->dso->short_name, name) == 0) {
1839                         maps->last_search_by_name = map;
1840                         goto out_unlock;
1841                 }
1842
1843         map = NULL;
1844
1845 out_unlock:
1846         up_read(&maps->lock);
1847         return map;
1848 }
1849
1850 int dso__load_vmlinux(struct dso *dso, struct map *map,
1851                       const char *vmlinux, bool vmlinux_allocated)
1852 {
1853         int err = -1;
1854         struct symsrc ss;
1855         char symfs_vmlinux[PATH_MAX];
1856         enum dso_binary_type symtab_type;
1857
1858         if (vmlinux[0] == '/')
1859                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1860         else
1861                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1862
1863         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1864                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1865         else
1866                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1867
1868         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1869                 return -1;
1870
1871         err = dso__load_sym(dso, map, &ss, &ss, 0);
1872         symsrc__destroy(&ss);
1873
1874         if (err > 0) {
1875                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1876                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1877                 else
1878                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1879                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1880                 dso__set_loaded(dso);
1881                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1882         }
1883
1884         return err;
1885 }
1886
1887 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1888 {
1889         int i, err = 0;
1890         char *filename = NULL;
1891
1892         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1893                  vmlinux_path__nr_entries + 1);
1894
1895         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1896                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1897                 if (err > 0)
1898                         goto out;
1899         }
1900
1901         if (!symbol_conf.ignore_vmlinux_buildid)
1902                 filename = dso__build_id_filename(dso, NULL, 0, false);
1903         if (filename != NULL) {
1904                 err = dso__load_vmlinux(dso, map, filename, true);
1905                 if (err > 0)
1906                         goto out;
1907                 free(filename);
1908         }
1909 out:
1910         return err;
1911 }
1912
1913 static bool visible_dir_filter(const char *name, struct dirent *d)
1914 {
1915         if (d->d_type != DT_DIR)
1916                 return false;
1917         return lsdir_no_dot_filter(name, d);
1918 }
1919
1920 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1921 {
1922         char kallsyms_filename[PATH_MAX];
1923         int ret = -1;
1924         struct strlist *dirs;
1925         struct str_node *nd;
1926
1927         dirs = lsdir(dir, visible_dir_filter);
1928         if (!dirs)
1929                 return -1;
1930
1931         strlist__for_each_entry(nd, dirs) {
1932                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1933                           "%s/%s/kallsyms", dir, nd->s);
1934                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1935                         strlcpy(dir, kallsyms_filename, dir_sz);
1936                         ret = 0;
1937                         break;
1938                 }
1939         }
1940
1941         strlist__delete(dirs);
1942
1943         return ret;
1944 }
1945
1946 /*
1947  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1948  * since access(R_OK) only checks with real UID/GID but open() use effective
1949  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1950  */
1951 static bool filename__readable(const char *file)
1952 {
1953         int fd = open(file, O_RDONLY);
1954         if (fd < 0)
1955                 return false;
1956         close(fd);
1957         return true;
1958 }
1959
1960 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1961 {
1962         u8 host_build_id[BUILD_ID_SIZE];
1963         char sbuild_id[SBUILD_ID_SIZE];
1964         bool is_host = false;
1965         char path[PATH_MAX];
1966
1967         if (!dso->has_build_id) {
1968                 /*
1969                  * Last resort, if we don't have a build-id and couldn't find
1970                  * any vmlinux file, try the running kernel kallsyms table.
1971                  */
1972                 goto proc_kallsyms;
1973         }
1974
1975         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1976                                  sizeof(host_build_id)) == 0)
1977                 is_host = dso__build_id_equal(dso, host_build_id);
1978
1979         /* Try a fast path for /proc/kallsyms if possible */
1980         if (is_host) {
1981                 /*
1982                  * Do not check the build-id cache, unless we know we cannot use
1983                  * /proc/kcore or module maps don't match to /proc/kallsyms.
1984                  * To check readability of /proc/kcore, do not use access(R_OK)
1985                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1986                  * can't check it.
1987                  */
1988                 if (filename__readable("/proc/kcore") &&
1989                     !validate_kcore_addresses("/proc/kallsyms", map))
1990                         goto proc_kallsyms;
1991         }
1992
1993         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1994
1995         /* Find kallsyms in build-id cache with kcore */
1996         scnprintf(path, sizeof(path), "%s/%s/%s",
1997                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
1998
1999         if (!find_matching_kcore(map, path, sizeof(path)))
2000                 return strdup(path);
2001
2002         /* Use current /proc/kallsyms if possible */
2003         if (is_host) {
2004 proc_kallsyms:
2005                 return strdup("/proc/kallsyms");
2006         }
2007
2008         /* Finally, find a cache of kallsyms */
2009         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2010                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2011                        sbuild_id);
2012                 return NULL;
2013         }
2014
2015         return strdup(path);
2016 }
2017
2018 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2019 {
2020         int err;
2021         const char *kallsyms_filename = NULL;
2022         char *kallsyms_allocated_filename = NULL;
2023         /*
2024          * Step 1: if the user specified a kallsyms or vmlinux filename, use
2025          * it and only it, reporting errors to the user if it cannot be used.
2026          *
2027          * For instance, try to analyse an ARM perf.data file _without_ a
2028          * build-id, or if the user specifies the wrong path to the right
2029          * vmlinux file, obviously we can't fallback to another vmlinux (a
2030          * x86_86 one, on the machine where analysis is being performed, say),
2031          * or worse, /proc/kallsyms.
2032          *
2033          * If the specified file _has_ a build-id and there is a build-id
2034          * section in the perf.data file, we will still do the expected
2035          * validation in dso__load_vmlinux and will bail out if they don't
2036          * match.
2037          */
2038         if (symbol_conf.kallsyms_name != NULL) {
2039                 kallsyms_filename = symbol_conf.kallsyms_name;
2040                 goto do_kallsyms;
2041         }
2042
2043         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2044                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2045         }
2046
2047         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2048                 err = dso__load_vmlinux_path(dso, map);
2049                 if (err > 0)
2050                         return err;
2051         }
2052
2053         /* do not try local files if a symfs was given */
2054         if (symbol_conf.symfs[0] != 0)
2055                 return -1;
2056
2057         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2058         if (!kallsyms_allocated_filename)
2059                 return -1;
2060
2061         kallsyms_filename = kallsyms_allocated_filename;
2062
2063 do_kallsyms:
2064         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2065         if (err > 0)
2066                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2067         free(kallsyms_allocated_filename);
2068
2069         if (err > 0 && !dso__is_kcore(dso)) {
2070                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2071                 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2072                 map__fixup_start(map);
2073                 map__fixup_end(map);
2074         }
2075
2076         return err;
2077 }
2078
2079 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2080 {
2081         int err;
2082         const char *kallsyms_filename = NULL;
2083         struct machine *machine = map__kmaps(map)->machine;
2084         char path[PATH_MAX];
2085
2086         if (machine__is_default_guest(machine)) {
2087                 /*
2088                  * if the user specified a vmlinux filename, use it and only
2089                  * it, reporting errors to the user if it cannot be used.
2090                  * Or use file guest_kallsyms inputted by user on commandline
2091                  */
2092                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2093                         err = dso__load_vmlinux(dso, map,
2094                                                 symbol_conf.default_guest_vmlinux_name,
2095                                                 false);
2096                         return err;
2097                 }
2098
2099                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2100                 if (!kallsyms_filename)
2101                         return -1;
2102         } else {
2103                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2104                 kallsyms_filename = path;
2105         }
2106
2107         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2108         if (err > 0)
2109                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2110         if (err > 0 && !dso__is_kcore(dso)) {
2111                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2112                 dso__set_long_name(dso, machine->mmap_name, false);
2113                 map__fixup_start(map);
2114                 map__fixup_end(map);
2115         }
2116
2117         return err;
2118 }
2119
2120 static void vmlinux_path__exit(void)
2121 {
2122         while (--vmlinux_path__nr_entries >= 0)
2123                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2124         vmlinux_path__nr_entries = 0;
2125
2126         zfree(&vmlinux_path);
2127 }
2128
2129 static const char * const vmlinux_paths[] = {
2130         "vmlinux",
2131         "/boot/vmlinux"
2132 };
2133
2134 static const char * const vmlinux_paths_upd[] = {
2135         "/boot/vmlinux-%s",
2136         "/usr/lib/debug/boot/vmlinux-%s",
2137         "/lib/modules/%s/build/vmlinux",
2138         "/usr/lib/debug/lib/modules/%s/vmlinux",
2139         "/usr/lib/debug/boot/vmlinux-%s.debug"
2140 };
2141
2142 static int vmlinux_path__add(const char *new_entry)
2143 {
2144         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2145         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2146                 return -1;
2147         ++vmlinux_path__nr_entries;
2148
2149         return 0;
2150 }
2151
2152 static int vmlinux_path__init(struct perf_env *env)
2153 {
2154         struct utsname uts;
2155         char bf[PATH_MAX];
2156         char *kernel_version;
2157         unsigned int i;
2158
2159         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2160                               ARRAY_SIZE(vmlinux_paths_upd)));
2161         if (vmlinux_path == NULL)
2162                 return -1;
2163
2164         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2165                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2166                         goto out_fail;
2167
2168         /* only try kernel version if no symfs was given */
2169         if (symbol_conf.symfs[0] != 0)
2170                 return 0;
2171
2172         if (env) {
2173                 kernel_version = env->os_release;
2174         } else {
2175                 if (uname(&uts) < 0)
2176                         goto out_fail;
2177
2178                 kernel_version = uts.release;
2179         }
2180
2181         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2182                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2183                 if (vmlinux_path__add(bf) < 0)
2184                         goto out_fail;
2185         }
2186
2187         return 0;
2188
2189 out_fail:
2190         vmlinux_path__exit();
2191         return -1;
2192 }
2193
2194 int setup_list(struct strlist **list, const char *list_str,
2195                       const char *list_name)
2196 {
2197         if (list_str == NULL)
2198                 return 0;
2199
2200         *list = strlist__new(list_str, NULL);
2201         if (!*list) {
2202                 pr_err("problems parsing %s list\n", list_name);
2203                 return -1;
2204         }
2205
2206         symbol_conf.has_filter = true;
2207         return 0;
2208 }
2209
2210 int setup_intlist(struct intlist **list, const char *list_str,
2211                   const char *list_name)
2212 {
2213         if (list_str == NULL)
2214                 return 0;
2215
2216         *list = intlist__new(list_str);
2217         if (!*list) {
2218                 pr_err("problems parsing %s list\n", list_name);
2219                 return -1;
2220         }
2221         return 0;
2222 }
2223
2224 static bool symbol__read_kptr_restrict(void)
2225 {
2226         bool value = false;
2227         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2228
2229         if (fp != NULL) {
2230                 char line[8];
2231
2232                 if (fgets(line, sizeof(line), fp) != NULL)
2233                         value = perf_cap__capable(CAP_SYSLOG) ?
2234                                         (atoi(line) >= 2) :
2235                                         (atoi(line) != 0);
2236
2237                 fclose(fp);
2238         }
2239
2240         /* Per kernel/kallsyms.c:
2241          * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2242          */
2243         if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2244                 value = true;
2245
2246         return value;
2247 }
2248
2249 int symbol__annotation_init(void)
2250 {
2251         if (symbol_conf.init_annotation)
2252                 return 0;
2253
2254         if (symbol_conf.initialized) {
2255                 pr_err("Annotation needs to be init before symbol__init()\n");
2256                 return -1;
2257         }
2258
2259         symbol_conf.priv_size += sizeof(struct annotation);
2260         symbol_conf.init_annotation = true;
2261         return 0;
2262 }
2263
2264 int symbol__init(struct perf_env *env)
2265 {
2266         const char *symfs;
2267
2268         if (symbol_conf.initialized)
2269                 return 0;
2270
2271         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2272
2273         symbol__elf_init();
2274
2275         if (symbol_conf.sort_by_name)
2276                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2277                                           sizeof(struct symbol));
2278
2279         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2280                 return -1;
2281
2282         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2283                 pr_err("'.' is the only non valid --field-separator argument\n");
2284                 return -1;
2285         }
2286
2287         if (setup_list(&symbol_conf.dso_list,
2288                        symbol_conf.dso_list_str, "dso") < 0)
2289                 return -1;
2290
2291         if (setup_list(&symbol_conf.comm_list,
2292                        symbol_conf.comm_list_str, "comm") < 0)
2293                 goto out_free_dso_list;
2294
2295         if (setup_intlist(&symbol_conf.pid_list,
2296                        symbol_conf.pid_list_str, "pid") < 0)
2297                 goto out_free_comm_list;
2298
2299         if (setup_intlist(&symbol_conf.tid_list,
2300                        symbol_conf.tid_list_str, "tid") < 0)
2301                 goto out_free_pid_list;
2302
2303         if (setup_list(&symbol_conf.sym_list,
2304                        symbol_conf.sym_list_str, "symbol") < 0)
2305                 goto out_free_tid_list;
2306
2307         if (setup_list(&symbol_conf.bt_stop_list,
2308                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2309                 goto out_free_sym_list;
2310
2311         /*
2312          * A path to symbols of "/" is identical to ""
2313          * reset here for simplicity.
2314          */
2315         symfs = realpath(symbol_conf.symfs, NULL);
2316         if (symfs == NULL)
2317                 symfs = symbol_conf.symfs;
2318         if (strcmp(symfs, "/") == 0)
2319                 symbol_conf.symfs = "";
2320         if (symfs != symbol_conf.symfs)
2321                 free((void *)symfs);
2322
2323         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2324
2325         symbol_conf.initialized = true;
2326         return 0;
2327
2328 out_free_sym_list:
2329         strlist__delete(symbol_conf.sym_list);
2330 out_free_tid_list:
2331         intlist__delete(symbol_conf.tid_list);
2332 out_free_pid_list:
2333         intlist__delete(symbol_conf.pid_list);
2334 out_free_comm_list:
2335         strlist__delete(symbol_conf.comm_list);
2336 out_free_dso_list:
2337         strlist__delete(symbol_conf.dso_list);
2338         return -1;
2339 }
2340
2341 void symbol__exit(void)
2342 {
2343         if (!symbol_conf.initialized)
2344                 return;
2345         strlist__delete(symbol_conf.bt_stop_list);
2346         strlist__delete(symbol_conf.sym_list);
2347         strlist__delete(symbol_conf.dso_list);
2348         strlist__delete(symbol_conf.comm_list);
2349         intlist__delete(symbol_conf.tid_list);
2350         intlist__delete(symbol_conf.pid_list);
2351         vmlinux_path__exit();
2352         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2353         symbol_conf.bt_stop_list = NULL;
2354         symbol_conf.initialized = false;
2355 }
2356
2357 int symbol__config_symfs(const struct option *opt __maybe_unused,
2358                          const char *dir, int unset __maybe_unused)
2359 {
2360         char *bf = NULL;
2361         int ret;
2362
2363         symbol_conf.symfs = strdup(dir);
2364         if (symbol_conf.symfs == NULL)
2365                 return -ENOMEM;
2366
2367         /* skip the locally configured cache if a symfs is given, and
2368          * config buildid dir to symfs/.debug
2369          */
2370         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2371         if (ret < 0)
2372                 return -ENOMEM;
2373
2374         set_buildid_dir(bf);
2375
2376         free(bf);
2377         return 0;
2378 }
2379
2380 struct mem_info *mem_info__get(struct mem_info *mi)
2381 {
2382         if (mi)
2383                 refcount_inc(&mi->refcnt);
2384         return mi;
2385 }
2386
2387 void mem_info__put(struct mem_info *mi)
2388 {
2389         if (mi && refcount_dec_and_test(&mi->refcnt))
2390                 free(mi);
2391 }
2392
2393 struct mem_info *mem_info__new(void)
2394 {
2395         struct mem_info *mi = zalloc(sizeof(*mi));
2396
2397         if (mi)
2398                 refcount_set(&mi->refcnt, 1);
2399         return mi;
2400 }