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