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                 "arch_cpu_idle",
 639                 "cpu_idle",
 640                 "cpu_startup_entry",
 641                 "intel_idle",
 642                 "default_idle",
 643                 "native_safe_halt",
 644                 "enter_idle",
 645                 "exit_idle",
 646                 "mwait_idle",
 647                 "mwait_idle_with_hints",
 648                 "poll_idle",
 649                 "ppc64_runlatch_off",
 650                 "pseries_dedicated_idle_sleep",
 651                 NULL
 652         };
 653         int i;
 654
 655         for (i = 0; idle_symbols[i]; i++) {
 656                 if (!strcmp(idle_symbols[i], name))
 657                         return true;
 658         }
 659
 660         return false;
 661 }
 662
 663 static int map__process_kallsym_symbol(void *arg, const char *name,
 664                                        char type, u64 start)
 665 {
 666         struct symbol *sym;
 667         struct dso *dso = arg;
 668         struct rb_root_cached *root = &dso->symbols;
 669
 670         if (!symbol_type__filter(type))
 671                 return 0;
 672
 673         /*
 674          * module symbols are not sorted so we add all
 675          * symbols, setting length to 0, and rely on
 676          * symbols__fixup_end() to fix it up.
 677          */
 678         sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 679         if (sym == NULL)
 680                 return -ENOMEM;
 681         /*
 682          * We will pass the symbols to the filter later, in
 683          * map__split_kallsyms, when we have split the maps per module
 684          */
 685         __symbols__insert(root, sym, !strchr(name, '['));
 686
 687         return 0;
 688 }
 689
 690 /*
 691  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 692  * so that we can in the next step set the symbol ->end address and then
 693  * call kernel_maps__split_kallsyms.
 694  */
 695 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 696 {
 697         return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 698 }
 699
 700 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
 701 {
 702         struct map *curr_map;
 703         struct symbol *pos;
 704         int count = 0;
 705         struct rb_root_cached old_root = dso->symbols;
 706         struct rb_root_cached *root = &dso->symbols;
 707         struct rb_node *next = rb_first_cached(root);
 708
 709         if (!kmaps)
 710                 return -1;
 711
 712         *root = RB_ROOT_CACHED;
 713
 714         while (next) {
 715                 char *module;
 716
 717                 pos = rb_entry(next, struct symbol, rb_node);
 718                 next = rb_next(&pos->rb_node);
 719
 720                 rb_erase_cached(&pos->rb_node, &old_root);
 721                 RB_CLEAR_NODE(&pos->rb_node);
 722                 module = strchr(pos->name, '\t');
 723                 if (module)
 724                         *module = '\0';
 725
 726                 curr_map = maps__find(kmaps, pos->start);
 727
 728                 if (!curr_map) {
 729                         symbol__delete(pos);
 730                         continue;
 731                 }
 732
 733                 pos->start -= curr_map->start - curr_map->pgoff;
 734                 if (pos->end > curr_map->end)
 735                         pos->end = curr_map->end;
 736                 if (pos->end)
 737                         pos->end -= curr_map->start - curr_map->pgoff;
 738                 symbols__insert(&curr_map->dso->symbols, pos);
 739                 ++count;
 740         }
 741
 742         /* Symbols have been adjusted */
 743         dso->adjust_symbols = 1;
 744
 745         return count;
 746 }
 747
 748 /*
 749  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 750  * kernel range is broken in several maps, named [kernel].N, as we don't have
 751  * the original ELF section names vmlinux have.
 752  */
 753 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 754                                 struct map *initial_map)
 755 {
 756         struct machine *machine;
 757         struct map *curr_map = initial_map;
 758         struct symbol *pos;
 759         int count = 0, moved = 0;
 760         struct rb_root_cached *root = &dso->symbols;
 761         struct rb_node *next = rb_first_cached(root);
 762         int kernel_range = 0;
 763         bool x86_64;
 764
 765         if (!kmaps)
 766                 return -1;
 767
 768         machine = kmaps->machine;
 769
 770         x86_64 = machine__is(machine, "x86_64");
 771
 772         while (next) {
 773                 char *module;
 774
 775                 pos = rb_entry(next, struct symbol, rb_node);
 776                 next = rb_next(&pos->rb_node);
 777
 778                 module = strchr(pos->name, '\t');
 779                 if (module) {
 780                         if (!symbol_conf.use_modules)
 781                                 goto discard_symbol;
 782
 783                         *module++ = '\0';
 784
 785                         if (strcmp(curr_map->dso->short_name, module)) {
 786                                 if (curr_map != initial_map &&
 787                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 788                                     machine__is_default_guest(machine)) {
 789                                         /*
 790                                          * We assume all symbols of a module are
 791                                          * continuous in * kallsyms, so curr_map
 792                                          * points to a module and all its
 793                                          * symbols are in its kmap. Mark it as
 794                                          * loaded.
 795                                          */
 796                                         dso__set_loaded(curr_map->dso);
 797                                 }
 798
 799                                 curr_map = maps__find_by_name(kmaps, module);
 800                                 if (curr_map == NULL) {
 801                                         pr_debug("%s/proc/{kallsyms,modules} "
 802                                                  "inconsistency while looking "
 803                                                  "for \"%s\" module!\n",
 804                                                  machine->root_dir, module);
 805                                         curr_map = initial_map;
 806                                         goto discard_symbol;
 807                                 }
 808
 809                                 if (curr_map->dso->loaded &&
 810                                     !machine__is_default_guest(machine))
 811                                         goto discard_symbol;
 812                         }
 813                         /*
 814                          * So that we look just like we get from .ko files,
 815                          * i.e. not prelinked, relative to initial_map->start.
 816                          */
 817                         pos->start = curr_map->map_ip(curr_map, pos->start);
 818                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 819                 } else if (x86_64 && is_entry_trampoline(pos->name)) {
 820                         /*
 821                          * These symbols are not needed anymore since the
 822                          * trampoline maps refer to the text section and it's
 823                          * symbols instead. Avoid having to deal with
 824                          * relocations, and the assumption that the first symbol
 825                          * is the start of kernel text, by simply removing the
 826                          * symbols at this point.
 827                          */
 828                         goto discard_symbol;
 829                 } else if (curr_map != initial_map) {
 830                         char dso_name[PATH_MAX];
 831                         struct dso *ndso;
 832
 833                         if (delta) {
 834                                 /* Kernel was relocated at boot time */
 835                                 pos->start -= delta;
 836                                 pos->end -= delta;
 837                         }
 838
 839                         if (count == 0) {
 840                                 curr_map = initial_map;
 841                                 goto add_symbol;
 842                         }
 843
 844                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 845                                 snprintf(dso_name, sizeof(dso_name),
 846                                         "[guest.kernel].%d",
 847                                         kernel_range++);
 848                         else
 849                                 snprintf(dso_name, sizeof(dso_name),
 850                                         "[kernel].%d",
 851                                         kernel_range++);
 852
 853                         ndso = dso__new(dso_name);
 854                         if (ndso == NULL)
 855                                 return -1;
 856
 857                         ndso->kernel = dso->kernel;
 858
 859                         curr_map = map__new2(pos->start, ndso);
 860                         if (curr_map == NULL) {
 861                                 dso__put(ndso);
 862                                 return -1;
 863                         }
 864
 865                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 866                         maps__insert(kmaps, curr_map);
 867                         ++kernel_range;
 868                 } else if (delta) {
 869                         /* Kernel was relocated at boot time */
 870                         pos->start -= delta;
 871                         pos->end -= delta;
 872                 }
 873 add_symbol:
 874                 if (curr_map != initial_map) {
 875                         rb_erase_cached(&pos->rb_node, root);
 876                         symbols__insert(&curr_map->dso->symbols, pos);
 877                         ++moved;
 878                 } else
 879                         ++count;
 880
 881                 continue;
 882 discard_symbol:
 883                 rb_erase_cached(&pos->rb_node, root);
 884                 symbol__delete(pos);
 885         }
 886
 887         if (curr_map != initial_map &&
 888             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 889             machine__is_default_guest(kmaps->machine)) {
 890                 dso__set_loaded(curr_map->dso);
 891         }
 892
 893         return count + moved;
 894 }
 895
 896 bool symbol__restricted_filename(const char *filename,
 897                                  const char *restricted_filename)
 898 {
 899         bool restricted = false;
 900
 901         if (symbol_conf.kptr_restrict) {
 902                 char *r = realpath(filename, NULL);
 903
 904                 if (r != NULL) {
 905                         restricted = strcmp(r, restricted_filename) == 0;
 906                         free(r);
 907                         return restricted;
 908                 }
 909         }
 910
 911         return restricted;
 912 }
 913
 914 struct module_info {
 915         struct rb_node rb_node;
 916         char *name;
 917         u64 start;
 918 };
 919
 920 static void add_module(struct module_info *mi, struct rb_root *modules)
 921 {
 922         struct rb_node **p = &modules->rb_node;
 923         struct rb_node *parent = NULL;
 924         struct module_info *m;
 925
 926         while (*p != NULL) {
 927                 parent = *p;
 928                 m = rb_entry(parent, struct module_info, rb_node);
 929                 if (strcmp(mi->name, m->name) < 0)
 930                         p = &(*p)->rb_left;
 931                 else
 932                         p = &(*p)->rb_right;
 933         }
 934         rb_link_node(&mi->rb_node, parent, p);
 935         rb_insert_color(&mi->rb_node, modules);
 936 }
 937
 938 static void delete_modules(struct rb_root *modules)
 939 {
 940         struct module_info *mi;
 941         struct rb_node *next = rb_first(modules);
 942
 943         while (next) {
 944                 mi = rb_entry(next, struct module_info, rb_node);
 945                 next = rb_next(&mi->rb_node);
 946                 rb_erase(&mi->rb_node, modules);
 947                 zfree(&mi->name);
 948                 free(mi);
 949         }
 950 }
 951
 952 static struct module_info *find_module(const char *name,
 953                                        struct rb_root *modules)
 954 {
 955         struct rb_node *n = modules->rb_node;
 956
 957         while (n) {
 958                 struct module_info *m;
 959                 int cmp;
 960
 961                 m = rb_entry(n, struct module_info, rb_node);
 962                 cmp = strcmp(name, m->name);
 963                 if (cmp < 0)
 964                         n = n->rb_left;
 965                 else if (cmp > 0)
 966                         n = n->rb_right;
 967                 else
 968                         return m;
 969         }
 970
 971         return NULL;
 972 }
 973
 974 static int __read_proc_modules(void *arg, const char *name, u64 start,
 975                                u64 size __maybe_unused)
 976 {
 977         struct rb_root *modules = arg;
 978         struct module_info *mi;
 979
 980         mi = zalloc(sizeof(struct module_info));
 981         if (!mi)
 982                 return -ENOMEM;
 983
 984         mi->name = strdup(name);
 985         mi->start = start;
 986
 987         if (!mi->name) {
 988                 free(mi);
 989                 return -ENOMEM;
 990         }
 991
 992         add_module(mi, modules);
 993
 994         return 0;
 995 }
 996
 997 static int read_proc_modules(const char *filename, struct rb_root *modules)
 998 {
 999         if (symbol__restricted_filename(filename, "/proc/modules"))
1000                 return -1;
1001
1002         if (modules__parse(filename, modules, __read_proc_modules)) {
1003                 delete_modules(modules);
1004                 return -1;
1005         }
1006
1007         return 0;
1008 }
1009
1010 int compare_proc_modules(const char *from, const char *to)
1011 {
1012         struct rb_root from_modules = RB_ROOT;
1013         struct rb_root to_modules = RB_ROOT;
1014         struct rb_node *from_node, *to_node;
1015         struct module_info *from_m, *to_m;
1016         int ret = -1;
1017
1018         if (read_proc_modules(from, &from_modules))
1019                 return -1;
1020
1021         if (read_proc_modules(to, &to_modules))
1022                 goto out_delete_from;
1023
1024         from_node = rb_first(&from_modules);
1025         to_node = rb_first(&to_modules);
1026         while (from_node) {
1027                 if (!to_node)
1028                         break;
1029
1030                 from_m = rb_entry(from_node, struct module_info, rb_node);
1031                 to_m = rb_entry(to_node, struct module_info, rb_node);
1032
1033                 if (from_m->start != to_m->start ||
1034                     strcmp(from_m->name, to_m->name))
1035                         break;
1036
1037                 from_node = rb_next(from_node);
1038                 to_node = rb_next(to_node);
1039         }
1040
1041         if (!from_node && !to_node)
1042                 ret = 0;
1043
1044         delete_modules(&to_modules);
1045 out_delete_from:
1046         delete_modules(&from_modules);
1047
1048         return ret;
1049 }
1050
1051 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1052 {
1053         struct rb_root modules = RB_ROOT;
1054         struct map *old_map;
1055         int err;
1056
1057         err = read_proc_modules(filename, &modules);
1058         if (err)
1059                 return err;
1060
1061         maps__for_each_entry(kmaps, old_map) {
1062                 struct module_info *mi;
1063
1064                 if (!__map__is_kmodule(old_map)) {
1065                         continue;
1066                 }
1067
1068                 /* Module must be in memory at the same address */
1069                 mi = find_module(old_map->dso->short_name, &modules);
1070                 if (!mi || mi->start != old_map->start) {
1071                         err = -EINVAL;
1072                         goto out;
1073                 }
1074         }
1075 out:
1076         delete_modules(&modules);
1077         return err;
1078 }
1079
1080 /*
1081  * If kallsyms is referenced by name then we look for filename in the same
1082  * directory.
1083  */
1084 static bool filename_from_kallsyms_filename(char *filename,
1085                                             const char *base_name,
1086                                             const char *kallsyms_filename)
1087 {
1088         char *name;
1089
1090         strcpy(filename, kallsyms_filename);
1091         name = strrchr(filename, '/');
1092         if (!name)
1093                 return false;
1094
1095         name += 1;
1096
1097         if (!strcmp(name, "kallsyms")) {
1098                 strcpy(name, base_name);
1099                 return true;
1100         }
1101
1102         return false;
1103 }
1104
1105 static int validate_kcore_modules(const char *kallsyms_filename,
1106                                   struct map *map)
1107 {
1108         struct maps *kmaps = map__kmaps(map);
1109         char modules_filename[PATH_MAX];
1110
1111         if (!kmaps)
1112                 return -EINVAL;
1113
1114         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1115                                              kallsyms_filename))
1116                 return -EINVAL;
1117
1118         if (do_validate_kcore_modules(modules_filename, kmaps))
1119                 return -EINVAL;
1120
1121         return 0;
1122 }
1123
1124 static int validate_kcore_addresses(const char *kallsyms_filename,
1125                                     struct map *map)
1126 {
1127         struct kmap *kmap = map__kmap(map);
1128
1129         if (!kmap)
1130                 return -EINVAL;
1131
1132         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1133                 u64 start;
1134
1135                 if (kallsyms__get_function_start(kallsyms_filename,
1136                                                  kmap->ref_reloc_sym->name, &start))
1137                         return -ENOENT;
1138                 if (start != kmap->ref_reloc_sym->addr)
1139                         return -EINVAL;
1140         }
1141
1142         return validate_kcore_modules(kallsyms_filename, map);
1143 }
1144
1145 struct kcore_mapfn_data {
1146         struct dso *dso;
1147         struct list_head maps;
1148 };
1149
1150 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1151 {
1152         struct kcore_mapfn_data *md = data;
1153         struct map *map;
1154
1155         map = map__new2(start, md->dso);
1156         if (map == NULL)
1157                 return -ENOMEM;
1158
1159         map->end = map->start + len;
1160         map->pgoff = pgoff;
1161
1162         list_add(&map->node, &md->maps);
1163
1164         return 0;
1165 }
1166
1167 /*
1168  * Merges map into maps by splitting the new map within the existing map
1169  * regions.
1170  */
1171 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1172 {
1173         struct map *old_map;
1174         LIST_HEAD(merged);
1175
1176         maps__for_each_entry(kmaps, old_map) {
1177                 /* no overload with this one */
1178                 if (new_map->end < old_map->start ||
1179                     new_map->start >= old_map->end)
1180                         continue;
1181
1182                 if (new_map->start < old_map->start) {
1183                         /*
1184                          * |new......
1185                          *       |old....
1186                          */
1187                         if (new_map->end < old_map->end) {
1188                                 /*
1189                                  * |new......|     -> |new..|
1190                                  *       |old....| ->       |old....|
1191                                  */
1192                                 new_map->end = old_map->start;
1193                         } else {
1194                                 /*
1195                                  * |new.............| -> |new..|       |new..|
1196                                  *       |old....|    ->       |old....|
1197                                  */
1198                                 struct map *m = map__clone(new_map);
1199
1200                                 if (!m)
1201                                         return -ENOMEM;
1202
1203                                 m->end = old_map->start;
1204                                 list_add_tail(&m->node, &merged);
1205                                 new_map->start = old_map->end;
1206                         }
1207                 } else {
1208                         /*
1209                          *      |new......
1210                          * |old....
1211                          */
1212                         if (new_map->end < old_map->end) {
1213                                 /*
1214                                  *      |new..|   -> x
1215                                  * |old.........| -> |old.........|
1216                                  */
1217                                 map__put(new_map);
1218                                 new_map = NULL;
1219                                 break;
1220                         } else {
1221                                 /*
1222                                  *      |new......| ->         |new...|
1223                                  * |old....|        -> |old....|
1224                                  */
1225                                 new_map->start = old_map->end;
1226                         }
1227                 }
1228         }
1229
1230         while (!list_empty(&merged)) {
1231                 old_map = list_entry(merged.next, struct map, node);
1232                 list_del_init(&old_map->node);
1233                 maps__insert(kmaps, old_map);
1234                 map__put(old_map);
1235         }
1236
1237         if (new_map) {
1238                 maps__insert(kmaps, new_map);
1239                 map__put(new_map);
1240         }
1241         return 0;
1242 }
1243
1244 static int dso__load_kcore(struct dso *dso, struct map *map,
1245                            const char *kallsyms_filename)
1246 {
1247         struct maps *kmaps = map__kmaps(map);
1248         struct kcore_mapfn_data md;
1249         struct map *old_map, *new_map, *replacement_map = NULL, *next;
1250         struct machine *machine;
1251         bool is_64_bit;
1252         int err, fd;
1253         char kcore_filename[PATH_MAX];
1254         u64 stext;
1255
1256         if (!kmaps)
1257                 return -EINVAL;
1258
1259         machine = kmaps->machine;
1260
1261         /* This function requires that the map is the kernel map */
1262         if (!__map__is_kernel(map))
1263                 return -EINVAL;
1264
1265         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1266                                              kallsyms_filename))
1267                 return -EINVAL;
1268
1269         /* Modules and kernel must be present at their original addresses */
1270         if (validate_kcore_addresses(kallsyms_filename, map))
1271                 return -EINVAL;
1272
1273         md.dso = dso;
1274         INIT_LIST_HEAD(&md.maps);
1275
1276         fd = open(kcore_filename, O_RDONLY);
1277         if (fd < 0) {
1278                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1279                          kcore_filename);
1280                 return -EINVAL;
1281         }
1282
1283         /* Read new maps into temporary lists */
1284         err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1285                               &is_64_bit);
1286         if (err)
1287                 goto out_err;
1288         dso->is_64_bit = is_64_bit;
1289
1290         if (list_empty(&md.maps)) {
1291                 err = -EINVAL;
1292                 goto out_err;
1293         }
1294
1295         /* Remove old maps */
1296         maps__for_each_entry_safe(kmaps, old_map, next) {
1297                 /*
1298                  * We need to preserve eBPF maps even if they are
1299                  * covered by kcore, because we need to access
1300                  * eBPF dso for source data.
1301                  */
1302                 if (old_map != map && !__map__is_bpf_prog(old_map))
1303                         maps__remove(kmaps, old_map);
1304         }
1305         machine->trampolines_mapped = false;
1306
1307         /* Find the kernel map using the '_stext' symbol */
1308         if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1309                 list_for_each_entry(new_map, &md.maps, node) {
1310                         if (stext >= new_map->start && stext < new_map->end) {
1311                                 replacement_map = new_map;
1312                                 break;
1313                         }
1314                 }
1315         }
1316
1317         if (!replacement_map)
1318                 replacement_map = list_entry(md.maps.next, struct map, node);
1319
1320         /* Add new maps */
1321         while (!list_empty(&md.maps)) {
1322                 new_map = list_entry(md.maps.next, struct map, node);
1323                 list_del_init(&new_map->node);
1324                 if (new_map == replacement_map) {
1325                         map->start      = new_map->start;
1326                         map->end        = new_map->end;
1327                         map->pgoff      = new_map->pgoff;
1328                         map->map_ip     = new_map->map_ip;
1329                         map->unmap_ip   = new_map->unmap_ip;
1330                         /* Ensure maps are correctly ordered */
1331                         map__get(map);
1332                         maps__remove(kmaps, map);
1333                         maps__insert(kmaps, map);
1334                         map__put(map);
1335                         map__put(new_map);
1336                 } else {
1337                         /*
1338                          * Merge kcore map into existing maps,
1339                          * and ensure that current maps (eBPF)
1340                          * stay intact.
1341                          */
1342                         if (maps__merge_in(kmaps, new_map))
1343                                 goto out_err;
1344                 }
1345         }
1346
1347         if (machine__is(machine, "x86_64")) {
1348                 u64 addr;
1349
1350                 /*
1351                  * If one of the corresponding symbols is there, assume the
1352                  * entry trampoline maps are too.
1353                  */
1354                 if (!kallsyms__get_function_start(kallsyms_filename,
1355                                                   ENTRY_TRAMPOLINE_NAME,
1356                                                   &addr))
1357                         machine->trampolines_mapped = true;
1358         }
1359
1360         /*
1361          * Set the data type and long name so that kcore can be read via
1362          * dso__data_read_addr().
1363          */
1364         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1365                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1366         else
1367                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1368         dso__set_long_name(dso, strdup(kcore_filename), true);
1369
1370         close(fd);
1371
1372         if (map->prot & PROT_EXEC)
1373                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1374         else
1375                 pr_debug("Using %s for kernel data\n", kcore_filename);
1376
1377         return 0;
1378
1379 out_err:
1380         while (!list_empty(&md.maps)) {
1381                 map = list_entry(md.maps.next, struct map, node);
1382                 list_del_init(&map->node);
1383                 map__put(map);
1384         }
1385         close(fd);
1386         return -EINVAL;
1387 }
1388
1389 /*
1390  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1391  * delta based on the relocation reference symbol.
1392  */
1393 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1394 {
1395         u64 addr;
1396
1397         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1398                 return 0;
1399
1400         if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1401                 return -1;
1402
1403         *delta = addr - kmap->ref_reloc_sym->addr;
1404         return 0;
1405 }
1406
1407 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1408                          struct map *map, bool no_kcore)
1409 {
1410         struct kmap *kmap = map__kmap(map);
1411         u64 delta = 0;
1412
1413         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1414                 return -1;
1415
1416         if (!kmap || !kmap->kmaps)
1417                 return -1;
1418
1419         if (dso__load_all_kallsyms(dso, filename) < 0)
1420                 return -1;
1421
1422         if (kallsyms__delta(kmap, filename, &delta))
1423                 return -1;
1424
1425         symbols__fixup_end(&dso->symbols);
1426         symbols__fixup_duplicate(&dso->symbols);
1427
1428         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1429                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1430         else
1431                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1432
1433         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1434                 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1435         else
1436                 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1437 }
1438
1439 int dso__load_kallsyms(struct dso *dso, const char *filename,
1440                        struct map *map)
1441 {
1442         return __dso__load_kallsyms(dso, filename, map, false);
1443 }
1444
1445 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1446 {
1447         char *line = NULL;
1448         size_t n;
1449         FILE *file;
1450         int nr_syms = 0;
1451
1452         file = fopen(map_path, "r");
1453         if (file == NULL)
1454                 goto out_failure;
1455
1456         while (!feof(file)) {
1457                 u64 start, size;
1458                 struct symbol *sym;
1459                 int line_len, len;
1460
1461                 line_len = getline(&line, &n, file);
1462                 if (line_len < 0)
1463                         break;
1464
1465                 if (!line)
1466                         goto out_failure;
1467
1468                 line[--line_len] = '\0'; /* \n */
1469
1470                 len = hex2u64(line, &start);
1471
1472                 len++;
1473                 if (len + 2 >= line_len)
1474                         continue;
1475
1476                 len += hex2u64(line + len, &size);
1477
1478                 len++;
1479                 if (len + 2 >= line_len)
1480                         continue;
1481
1482                 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1483
1484                 if (sym == NULL)
1485                         goto out_delete_line;
1486
1487                 symbols__insert(&dso->symbols, sym);
1488                 nr_syms++;
1489         }
1490
1491         free(line);
1492         fclose(file);
1493
1494         return nr_syms;
1495
1496 out_delete_line:
1497         free(line);
1498 out_failure:
1499         return -1;
1500 }
1501
1502 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1503                                            enum dso_binary_type type)
1504 {
1505         switch (type) {
1506         case DSO_BINARY_TYPE__JAVA_JIT:
1507         case DSO_BINARY_TYPE__DEBUGLINK:
1508         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1509         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1510         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1511         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1512         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1513                 return !kmod && dso->kernel == DSO_TYPE_USER;
1514
1515         case DSO_BINARY_TYPE__KALLSYMS:
1516         case DSO_BINARY_TYPE__VMLINUX:
1517         case DSO_BINARY_TYPE__KCORE:
1518                 return dso->kernel == DSO_TYPE_KERNEL;
1519
1520         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1521         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1522         case DSO_BINARY_TYPE__GUEST_KCORE:
1523                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1524
1525         case DSO_BINARY_TYPE__GUEST_KMODULE:
1526         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1527         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1528         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1529                 /*
1530                  * kernel modules know their symtab type - it's set when
1531                  * creating a module dso in machine__addnew_module_map().
1532                  */
1533                 return kmod && dso->symtab_type == type;
1534
1535         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1536         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1537                 return true;
1538
1539         case DSO_BINARY_TYPE__BPF_PROG_INFO:
1540         case DSO_BINARY_TYPE__NOT_FOUND:
1541         default:
1542                 return false;
1543         }
1544 }
1545
1546 /* Checks for the existence of the perf-<pid>.map file in two different
1547  * locations.  First, if the process is a separate mount namespace, check in
1548  * that namespace using the pid of the innermost pid namespace.  If's not in a
1549  * namespace, or the file can't be found there, try in the mount namespace of
1550  * the tracing process using our view of its pid.
1551  */
1552 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1553                               struct nsinfo **nsip)
1554 {
1555         struct nscookie nsc;
1556         struct nsinfo *nsi;
1557         struct nsinfo *nnsi;
1558         int rc = -1;
1559
1560         nsi = *nsip;
1561
1562         if (nsi->need_setns) {
1563                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1564                 nsinfo__mountns_enter(nsi, &nsc);
1565                 rc = access(filebuf, R_OK);
1566                 nsinfo__mountns_exit(&nsc);
1567                 if (rc == 0)
1568                         return rc;
1569         }
1570
1571         nnsi = nsinfo__copy(nsi);
1572         if (nnsi) {
1573                 nsinfo__put(nsi);
1574
1575                 nnsi->need_setns = false;
1576                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1577                 *nsip = nnsi;
1578                 rc = 0;
1579         }
1580
1581         return rc;
1582 }
1583
1584 int dso__load(struct dso *dso, struct map *map)
1585 {
1586         char *name;
1587         int ret = -1;
1588         u_int i;
1589         struct machine *machine = NULL;
1590         char *root_dir = (char *) "";
1591         int ss_pos = 0;
1592         struct symsrc ss_[2];
1593         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1594         bool kmod;
1595         bool perfmap;
1596         unsigned char build_id[BUILD_ID_SIZE];
1597         struct nscookie nsc;
1598         char newmapname[PATH_MAX];
1599         const char *map_path = dso->long_name;
1600
1601         perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1602         if (perfmap) {
1603                 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1604                     sizeof(newmapname), &dso->nsinfo) == 0)) {
1605                         map_path = newmapname;
1606                 }
1607         }
1608
1609         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1610         pthread_mutex_lock(&dso->lock);
1611
1612         /* check again under the dso->lock */
1613         if (dso__loaded(dso)) {
1614                 ret = 1;
1615                 goto out;
1616         }
1617
1618         if (dso->kernel) {
1619                 if (dso->kernel == DSO_TYPE_KERNEL)
1620                         ret = dso__load_kernel_sym(dso, map);
1621                 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1622                         ret = dso__load_guest_kernel_sym(dso, map);
1623
1624                 machine = map__kmaps(map)->machine;
1625                 if (machine__is(machine, "x86_64"))
1626                         machine__map_x86_64_entry_trampolines(machine, dso);
1627                 goto out;
1628         }
1629
1630         dso->adjust_symbols = 0;
1631
1632         if (perfmap) {
1633                 ret = dso__load_perf_map(map_path, dso);
1634                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1635                                              DSO_BINARY_TYPE__NOT_FOUND;
1636                 goto out;
1637         }
1638
1639         if (machine)
1640                 root_dir = machine->root_dir;
1641
1642         name = malloc(PATH_MAX);
1643         if (!name)
1644                 goto out;
1645
1646         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1647                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1648                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1649                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1650
1651
1652         /*
1653          * Read the build id if possible. This is required for
1654          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1655          */
1656         if (!dso->has_build_id &&
1657             is_regular_file(dso->long_name)) {
1658             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1659             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1660                 dso__set_build_id(dso, build_id);
1661         }
1662
1663         /*
1664          * Iterate over candidate debug images.
1665          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1666          * and/or opd section) for processing.
1667          */
1668         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1669                 struct symsrc *ss = &ss_[ss_pos];
1670                 bool next_slot = false;
1671                 bool is_reg;
1672                 bool nsexit;
1673                 int sirc = -1;
1674
1675                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1676
1677                 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1678                     symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1679
1680                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1681                         continue;
1682
1683                 if (dso__read_binary_type_filename(dso, symtab_type,
1684                                                    root_dir, name, PATH_MAX))
1685                         continue;
1686
1687                 if (nsexit)
1688                         nsinfo__mountns_exit(&nsc);
1689
1690                 is_reg = is_regular_file(name);
1691                 if (is_reg)
1692                         sirc = symsrc__init(ss, dso, name, symtab_type);
1693
1694                 if (nsexit)
1695                         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1696
1697                 if (!is_reg || sirc < 0)
1698                         continue;
1699
1700                 if (!syms_ss && symsrc__has_symtab(ss)) {
1701                         syms_ss = ss;
1702                         next_slot = true;
1703                         if (!dso->symsrc_filename)
1704                                 dso->symsrc_filename = strdup(name);
1705                 }
1706
1707                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1708                         runtime_ss = ss;
1709                         next_slot = true;
1710                 }
1711
1712                 if (next_slot) {
1713                         ss_pos++;
1714
1715                         if (syms_ss && runtime_ss)
1716                                 break;
1717                 } else {
1718                         symsrc__destroy(ss);
1719                 }
1720
1721         }
1722
1723         if (!runtime_ss && !syms_ss)
1724                 goto out_free;
1725
1726         if (runtime_ss && !syms_ss) {
1727                 syms_ss = runtime_ss;
1728         }
1729
1730         /* We'll have to hope for the best */
1731         if (!runtime_ss && syms_ss)
1732                 runtime_ss = syms_ss;
1733
1734         if (syms_ss)
1735                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1736         else
1737                 ret = -1;
1738
1739         if (ret > 0) {
1740                 int nr_plt;
1741
1742                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1743                 if (nr_plt > 0)
1744                         ret += nr_plt;
1745         }
1746
1747         for (; ss_pos > 0; ss_pos--)
1748                 symsrc__destroy(&ss_[ss_pos - 1]);
1749 out_free:
1750         free(name);
1751         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1752                 ret = 0;
1753 out:
1754         dso__set_loaded(dso);
1755         pthread_mutex_unlock(&dso->lock);
1756         nsinfo__mountns_exit(&nsc);
1757
1758         return ret;
1759 }
1760
1761 static int map__strcmp(const void *a, const void *b)
1762 {
1763         const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1764         return strcmp(ma->dso->short_name, mb->dso->short_name);
1765 }
1766
1767 static int map__strcmp_name(const void *name, const void *b)
1768 {
1769         const struct map *map = *(const struct map **)b;
1770         return strcmp(name, map->dso->short_name);
1771 }
1772
1773 void __maps__sort_by_name(struct maps *maps)
1774 {
1775         qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1776 }
1777
1778 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1779 {
1780         struct map *map;
1781         struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1782         int i = 0;
1783
1784         if (maps_by_name == NULL)
1785                 return -1;
1786
1787         maps->maps_by_name = maps_by_name;
1788         maps->nr_maps_allocated = maps->nr_maps;
1789
1790         maps__for_each_entry(maps, map)
1791                 maps_by_name[i++] = map;
1792
1793         __maps__sort_by_name(maps);
1794         return 0;
1795 }
1796
1797 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1798 {
1799         struct map **mapp;
1800
1801         if (maps->maps_by_name == NULL &&
1802             map__groups__sort_by_name_from_rbtree(maps))
1803                 return NULL;
1804
1805         mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1806         if (mapp)
1807                 return *mapp;
1808         return NULL;
1809 }
1810
1811 struct map *maps__find_by_name(struct maps *maps, const char *name)
1812 {
1813         struct map *map;
1814
1815         down_read(&maps->lock);
1816
1817         if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1818                 map = maps->last_search_by_name;
1819                 goto out_unlock;
1820         }
1821         /*
1822          * If we have maps->maps_by_name, then the name isn't in the rbtree,
1823          * as maps->maps_by_name mirrors the rbtree when lookups by name are
1824          * made.
1825          */
1826         map = __maps__find_by_name(maps, name);
1827         if (map || maps->maps_by_name != NULL)
1828                 goto out_unlock;
1829
1830         /* Fallback to traversing the rbtree... */
1831         maps__for_each_entry(maps, map)
1832                 if (strcmp(map->dso->short_name, name) == 0) {
1833                         maps->last_search_by_name = map;
1834                         goto out_unlock;
1835                 }
1836
1837         map = NULL;
1838
1839 out_unlock:
1840         up_read(&maps->lock);
1841         return map;
1842 }
1843
1844 int dso__load_vmlinux(struct dso *dso, struct map *map,
1845                       const char *vmlinux, bool vmlinux_allocated)
1846 {
1847         int err = -1;
1848         struct symsrc ss;
1849         char symfs_vmlinux[PATH_MAX];
1850         enum dso_binary_type symtab_type;
1851
1852         if (vmlinux[0] == '/')
1853                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1854         else
1855                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1856
1857         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1858                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1859         else
1860                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1861
1862         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1863                 return -1;
1864
1865         err = dso__load_sym(dso, map, &ss, &ss, 0);
1866         symsrc__destroy(&ss);
1867
1868         if (err > 0) {
1869                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1870                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1871                 else
1872                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1873                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1874                 dso__set_loaded(dso);
1875                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1876         }
1877
1878         return err;
1879 }
1880
1881 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1882 {
1883         int i, err = 0;
1884         char *filename = NULL;
1885
1886         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1887                  vmlinux_path__nr_entries + 1);
1888
1889         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1890                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1891                 if (err > 0)
1892                         goto out;
1893         }
1894
1895         if (!symbol_conf.ignore_vmlinux_buildid)
1896                 filename = dso__build_id_filename(dso, NULL, 0, false);
1897         if (filename != NULL) {
1898                 err = dso__load_vmlinux(dso, map, filename, true);
1899                 if (err > 0)
1900                         goto out;
1901                 free(filename);
1902         }
1903 out:
1904         return err;
1905 }
1906
1907 static bool visible_dir_filter(const char *name, struct dirent *d)
1908 {
1909         if (d->d_type != DT_DIR)
1910                 return false;
1911         return lsdir_no_dot_filter(name, d);
1912 }
1913
1914 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1915 {
1916         char kallsyms_filename[PATH_MAX];
1917         int ret = -1;
1918         struct strlist *dirs;
1919         struct str_node *nd;
1920
1921         dirs = lsdir(dir, visible_dir_filter);
1922         if (!dirs)
1923                 return -1;
1924
1925         strlist__for_each_entry(nd, dirs) {
1926                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1927                           "%s/%s/kallsyms", dir, nd->s);
1928                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1929                         strlcpy(dir, kallsyms_filename, dir_sz);
1930                         ret = 0;
1931                         break;
1932                 }
1933         }
1934
1935         strlist__delete(dirs);
1936
1937         return ret;
1938 }
1939
1940 /*
1941  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1942  * since access(R_OK) only checks with real UID/GID but open() use effective
1943  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1944  */
1945 static bool filename__readable(const char *file)
1946 {
1947         int fd = open(file, O_RDONLY);
1948         if (fd < 0)
1949                 return false;
1950         close(fd);
1951         return true;
1952 }
1953
1954 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1955 {
1956         u8 host_build_id[BUILD_ID_SIZE];
1957         char sbuild_id[SBUILD_ID_SIZE];
1958         bool is_host = false;
1959         char path[PATH_MAX];
1960
1961         if (!dso->has_build_id) {
1962                 /*
1963                  * Last resort, if we don't have a build-id and couldn't find
1964                  * any vmlinux file, try the running kernel kallsyms table.
1965                  */
1966                 goto proc_kallsyms;
1967         }
1968
1969         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1970                                  sizeof(host_build_id)) == 0)
1971                 is_host = dso__build_id_equal(dso, host_build_id);
1972
1973         /* Try a fast path for /proc/kallsyms if possible */
1974         if (is_host) {
1975                 /*
1976                  * Do not check the build-id cache, unless we know we cannot use
1977                  * /proc/kcore or module maps don't match to /proc/kallsyms.
1978                  * To check readability of /proc/kcore, do not use access(R_OK)
1979                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1980                  * can't check it.
1981                  */
1982                 if (filename__readable("/proc/kcore") &&
1983                     !validate_kcore_addresses("/proc/kallsyms", map))
1984                         goto proc_kallsyms;
1985         }
1986
1987         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1988
1989         /* Find kallsyms in build-id cache with kcore */
1990         scnprintf(path, sizeof(path), "%s/%s/%s",
1991                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
1992
1993         if (!find_matching_kcore(map, path, sizeof(path)))
1994                 return strdup(path);
1995
1996         /* Use current /proc/kallsyms if possible */
1997         if (is_host) {
1998 proc_kallsyms:
1999                 return strdup("/proc/kallsyms");
2000         }
2001
2002         /* Finally, find a cache of kallsyms */
2003         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2004                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2005                        sbuild_id);
2006                 return NULL;
2007         }
2008
2009         return strdup(path);
2010 }
2011
2012 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2013 {
2014         int err;
2015         const char *kallsyms_filename = NULL;
2016         char *kallsyms_allocated_filename = NULL;
2017         /*
2018          * Step 1: if the user specified a kallsyms or vmlinux filename, use
2019          * it and only it, reporting errors to the user if it cannot be used.
2020          *
2021          * For instance, try to analyse an ARM perf.data file _without_ a
2022          * build-id, or if the user specifies the wrong path to the right
2023          * vmlinux file, obviously we can't fallback to another vmlinux (a
2024          * x86_86 one, on the machine where analysis is being performed, say),
2025          * or worse, /proc/kallsyms.
2026          *
2027          * If the specified file _has_ a build-id and there is a build-id
2028          * section in the perf.data file, we will still do the expected
2029          * validation in dso__load_vmlinux and will bail out if they don't
2030          * match.
2031          */
2032         if (symbol_conf.kallsyms_name != NULL) {
2033                 kallsyms_filename = symbol_conf.kallsyms_name;
2034                 goto do_kallsyms;
2035         }
2036
2037         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2038                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2039         }
2040
2041         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2042                 err = dso__load_vmlinux_path(dso, map);
2043                 if (err > 0)
2044                         return err;
2045         }
2046
2047         /* do not try local files if a symfs was given */
2048         if (symbol_conf.symfs[0] != 0)
2049                 return -1;
2050
2051         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2052         if (!kallsyms_allocated_filename)
2053                 return -1;
2054
2055         kallsyms_filename = kallsyms_allocated_filename;
2056
2057 do_kallsyms:
2058         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2059         if (err > 0)
2060                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2061         free(kallsyms_allocated_filename);
2062
2063         if (err > 0 && !dso__is_kcore(dso)) {
2064                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2065                 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2066                 map__fixup_start(map);
2067                 map__fixup_end(map);
2068         }
2069
2070         return err;
2071 }
2072
2073 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2074 {
2075         int err;
2076         const char *kallsyms_filename = NULL;
2077         struct machine *machine = map__kmaps(map)->machine;
2078         char path[PATH_MAX];
2079
2080         if (machine__is_default_guest(machine)) {
2081                 /*
2082                  * if the user specified a vmlinux filename, use it and only
2083                  * it, reporting errors to the user if it cannot be used.
2084                  * Or use file guest_kallsyms inputted by user on commandline
2085                  */
2086                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2087                         err = dso__load_vmlinux(dso, map,
2088                                                 symbol_conf.default_guest_vmlinux_name,
2089                                                 false);
2090                         return err;
2091                 }
2092
2093                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2094                 if (!kallsyms_filename)
2095                         return -1;
2096         } else {
2097                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2098                 kallsyms_filename = path;
2099         }
2100
2101         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2102         if (err > 0)
2103                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2104         if (err > 0 && !dso__is_kcore(dso)) {
2105                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2106                 dso__set_long_name(dso, machine->mmap_name, false);
2107                 map__fixup_start(map);
2108                 map__fixup_end(map);
2109         }
2110
2111         return err;
2112 }
2113
2114 static void vmlinux_path__exit(void)
2115 {
2116         while (--vmlinux_path__nr_entries >= 0)
2117                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2118         vmlinux_path__nr_entries = 0;
2119
2120         zfree(&vmlinux_path);
2121 }
2122
2123 static const char * const vmlinux_paths[] = {
2124         "vmlinux",
2125         "/boot/vmlinux"
2126 };
2127
2128 static const char * const vmlinux_paths_upd[] = {
2129         "/boot/vmlinux-%s",
2130         "/usr/lib/debug/boot/vmlinux-%s",
2131         "/lib/modules/%s/build/vmlinux",
2132         "/usr/lib/debug/lib/modules/%s/vmlinux",
2133         "/usr/lib/debug/boot/vmlinux-%s.debug"
2134 };
2135
2136 static int vmlinux_path__add(const char *new_entry)
2137 {
2138         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2139         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2140                 return -1;
2141         ++vmlinux_path__nr_entries;
2142
2143         return 0;
2144 }
2145
2146 static int vmlinux_path__init(struct perf_env *env)
2147 {
2148         struct utsname uts;
2149         char bf[PATH_MAX];
2150         char *kernel_version;
2151         unsigned int i;
2152
2153         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2154                               ARRAY_SIZE(vmlinux_paths_upd)));
2155         if (vmlinux_path == NULL)
2156                 return -1;
2157
2158         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2159                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2160                         goto out_fail;
2161
2162         /* only try kernel version if no symfs was given */
2163         if (symbol_conf.symfs[0] != 0)
2164                 return 0;
2165
2166         if (env) {
2167                 kernel_version = env->os_release;
2168         } else {
2169                 if (uname(&uts) < 0)
2170                         goto out_fail;
2171
2172                 kernel_version = uts.release;
2173         }
2174
2175         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2176                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2177                 if (vmlinux_path__add(bf) < 0)
2178                         goto out_fail;
2179         }
2180
2181         return 0;
2182
2183 out_fail:
2184         vmlinux_path__exit();
2185         return -1;
2186 }
2187
2188 int setup_list(struct strlist **list, const char *list_str,
2189                       const char *list_name)
2190 {
2191         if (list_str == NULL)
2192                 return 0;
2193
2194         *list = strlist__new(list_str, NULL);
2195         if (!*list) {
2196                 pr_err("problems parsing %s list\n", list_name);
2197                 return -1;
2198         }
2199
2200         symbol_conf.has_filter = true;
2201         return 0;
2202 }
2203
2204 int setup_intlist(struct intlist **list, const char *list_str,
2205                   const char *list_name)
2206 {
2207         if (list_str == NULL)
2208                 return 0;
2209
2210         *list = intlist__new(list_str);
2211         if (!*list) {
2212                 pr_err("problems parsing %s list\n", list_name);
2213                 return -1;
2214         }
2215         return 0;
2216 }
2217
2218 static bool symbol__read_kptr_restrict(void)
2219 {
2220         bool value = false;
2221         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2222
2223         if (fp != NULL) {
2224                 char line[8];
2225
2226                 if (fgets(line, sizeof(line), fp) != NULL)
2227                         value = perf_cap__capable(CAP_SYSLOG) ?
2228                                         (atoi(line) >= 2) :
2229                                         (atoi(line) != 0);
2230
2231                 fclose(fp);
2232         }
2233
2234         /* Per kernel/kallsyms.c:
2235          * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2236          */
2237         if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2238                 value = true;
2239
2240         return value;
2241 }
2242
2243 int symbol__annotation_init(void)
2244 {
2245         if (symbol_conf.init_annotation)
2246                 return 0;
2247
2248         if (symbol_conf.initialized) {
2249                 pr_err("Annotation needs to be init before symbol__init()\n");
2250                 return -1;
2251         }
2252
2253         symbol_conf.priv_size += sizeof(struct annotation);
2254         symbol_conf.init_annotation = true;
2255         return 0;
2256 }
2257
2258 int symbol__init(struct perf_env *env)
2259 {
2260         const char *symfs;
2261
2262         if (symbol_conf.initialized)
2263                 return 0;
2264
2265         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2266
2267         symbol__elf_init();
2268
2269         if (symbol_conf.sort_by_name)
2270                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2271                                           sizeof(struct symbol));
2272
2273         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2274                 return -1;
2275
2276         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2277                 pr_err("'.' is the only non valid --field-separator argument\n");
2278                 return -1;
2279         }
2280
2281         if (setup_list(&symbol_conf.dso_list,
2282                        symbol_conf.dso_list_str, "dso") < 0)
2283                 return -1;
2284
2285         if (setup_list(&symbol_conf.comm_list,
2286                        symbol_conf.comm_list_str, "comm") < 0)
2287                 goto out_free_dso_list;
2288
2289         if (setup_intlist(&symbol_conf.pid_list,
2290                        symbol_conf.pid_list_str, "pid") < 0)
2291                 goto out_free_comm_list;
2292
2293         if (setup_intlist(&symbol_conf.tid_list,
2294                        symbol_conf.tid_list_str, "tid") < 0)
2295                 goto out_free_pid_list;
2296
2297         if (setup_list(&symbol_conf.sym_list,
2298                        symbol_conf.sym_list_str, "symbol") < 0)
2299                 goto out_free_tid_list;
2300
2301         if (setup_list(&symbol_conf.bt_stop_list,
2302                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2303                 goto out_free_sym_list;
2304
2305         /*
2306          * A path to symbols of "/" is identical to ""
2307          * reset here for simplicity.
2308          */
2309         symfs = realpath(symbol_conf.symfs, NULL);
2310         if (symfs == NULL)
2311                 symfs = symbol_conf.symfs;
2312         if (strcmp(symfs, "/") == 0)
2313                 symbol_conf.symfs = "";
2314         if (symfs != symbol_conf.symfs)
2315                 free((void *)symfs);
2316
2317         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2318
2319         symbol_conf.initialized = true;
2320         return 0;
2321
2322 out_free_sym_list:
2323         strlist__delete(symbol_conf.sym_list);
2324 out_free_tid_list:
2325         intlist__delete(symbol_conf.tid_list);
2326 out_free_pid_list:
2327         intlist__delete(symbol_conf.pid_list);
2328 out_free_comm_list:
2329         strlist__delete(symbol_conf.comm_list);
2330 out_free_dso_list:
2331         strlist__delete(symbol_conf.dso_list);
2332         return -1;
2333 }
2334
2335 void symbol__exit(void)
2336 {
2337         if (!symbol_conf.initialized)
2338                 return;
2339         strlist__delete(symbol_conf.bt_stop_list);
2340         strlist__delete(symbol_conf.sym_list);
2341         strlist__delete(symbol_conf.dso_list);
2342         strlist__delete(symbol_conf.comm_list);
2343         intlist__delete(symbol_conf.tid_list);
2344         intlist__delete(symbol_conf.pid_list);
2345         vmlinux_path__exit();
2346         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2347         symbol_conf.bt_stop_list = NULL;
2348         symbol_conf.initialized = false;
2349 }
2350
2351 int symbol__config_symfs(const struct option *opt __maybe_unused,
2352                          const char *dir, int unset __maybe_unused)
2353 {
2354         char *bf = NULL;
2355         int ret;
2356
2357         symbol_conf.symfs = strdup(dir);
2358         if (symbol_conf.symfs == NULL)
2359                 return -ENOMEM;
2360
2361         /* skip the locally configured cache if a symfs is given, and
2362          * config buildid dir to symfs/.debug
2363          */
2364         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2365         if (ret < 0)
2366                 return -ENOMEM;
2367
2368         set_buildid_dir(bf);
2369
2370         free(bf);
2371         return 0;
2372 }
2373
2374 struct mem_info *mem_info__get(struct mem_info *mi)
2375 {
2376         if (mi)
2377                 refcount_inc(&mi->refcnt);
2378         return mi;
2379 }
2380
2381 void mem_info__put(struct mem_info *mi)
2382 {
2383         if (mi && refcount_dec_and_test(&mi->refcnt))
2384                 free(mi);
2385 }
2386
2387 struct mem_info *mem_info__new(void)
2388 {
2389         struct mem_info *mi = zalloc(sizeof(*mi));
2390
2391         if (mi)
2392                 refcount_set(&mi->refcnt, 1);
2393         return mi;
2394 }