tools/perf/util/symbol.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <dirent.h>
   3 #include <errno.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <linux/capability.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mman.h>
  10 #include <linux/string.h>
  11 #include <linux/time64.h>
  12 #include <sys/types.h>
  13 #include <sys/stat.h>
  14 #include <sys/param.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <inttypes.h>
  18 #include "annotate.h"
  19 #include "build-id.h"
  20 #include "cap.h"
  21 #include "dso.h"
  22 #include "util.h" // lsdir()
  23 #include "debug.h"
  24 #include "event.h"
  25 #include "machine.h"
  26 #include "map.h"
  27 #include "symbol.h"
  28 #include "map_symbol.h"
  29 #include "mem-events.h"
  30 #include "symsrc.h"
  31 #include "strlist.h"
  32 #include "intlist.h"
  33 #include "namespaces.h"
  34 #include "header.h"
  35 #include "path.h"
  36 #include <linux/ctype.h>
  37 #include <linux/zalloc.h>
  38
  39 #include <elf.h>
  40 #include <limits.h>
  41 #include <symbol/kallsyms.h>
  42 #include <sys/utsname.h>
  43
  44 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
  45 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
  46 static bool symbol__is_idle(const char *name);
  47
  48 int vmlinux_path__nr_entries;
  49 char **vmlinux_path;
  50
  51 struct symbol_conf symbol_conf = {
  52         .nanosecs               = false,
  53         .use_modules            = true,
  54         .try_vmlinux_path       = true,
  55         .demangle               = true,
  56         .demangle_kernel        = false,
  57         .cumulate_callchain     = true,
  58         .time_quantum           = 100 * NSEC_PER_MSEC, /* 100ms */
  59         .show_hist_headers      = true,
  60         .symfs                  = "",
  61         .event_group            = true,
  62         .inline_name            = true,
  63         .res_sample             = 0,
  64 };
  65
  66 static enum dso_binary_type binary_type_symtab[] = {
  67         DSO_BINARY_TYPE__KALLSYMS,
  68         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  69         DSO_BINARY_TYPE__JAVA_JIT,
  70         DSO_BINARY_TYPE__DEBUGLINK,
  71         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  72         DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
  73         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  74         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  75         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  76         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  77         DSO_BINARY_TYPE__GUEST_KMODULE,
  78         DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  79         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  80         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  81         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  82         DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
  83         DSO_BINARY_TYPE__NOT_FOUND,
  84 };
  85
  86 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  87
  88 static bool symbol_type__filter(char symbol_type)
  89 {
  90         symbol_type = toupper(symbol_type);
  91         return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
  92 }
  93
  94 static int prefix_underscores_count(const char *str)
  95 {
  96         const char *tail = str;
  97
  98         while (*tail == '_')
  99                 tail++;
 100
 101         return tail - str;
 102 }
 103
 104 void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
 105 {
 106         p->end = c->start;
 107 }
 108
 109 const char * __weak arch__normalize_symbol_name(const char *name)
 110 {
 111         return name;
 112 }
 113
 114 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
 115 {
 116         return strcmp(namea, nameb);
 117 }
 118
 119 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
 120                                         unsigned int n)
 121 {
 122         return strncmp(namea, nameb, n);
 123 }
 124
 125 int __weak arch__choose_best_symbol(struct symbol *syma,
 126                                     struct symbol *symb __maybe_unused)
 127 {
 128         /* Avoid "SyS" kernel syscall aliases */
 129         if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
 130                 return SYMBOL_B;
 131         if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 132                 return SYMBOL_B;
 133
 134         return SYMBOL_A;
 135 }
 136
 137 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 138 {
 139         s64 a;
 140         s64 b;
 141         size_t na, nb;
 142
 143         /* Prefer a symbol with non zero length */
 144         a = syma->end - syma->start;
 145         b = symb->end - symb->start;
 146         if ((b == 0) && (a > 0))
 147                 return SYMBOL_A;
 148         else if ((a == 0) && (b > 0))
 149                 return SYMBOL_B;
 150
 151         /* Prefer a non weak symbol over a weak one */
 152         a = syma->binding == STB_WEAK;
 153         b = symb->binding == STB_WEAK;
 154         if (b && !a)
 155                 return SYMBOL_A;
 156         if (a && !b)
 157                 return SYMBOL_B;
 158
 159         /* Prefer a global symbol over a non global one */
 160         a = syma->binding == STB_GLOBAL;
 161         b = symb->binding == STB_GLOBAL;
 162         if (a && !b)
 163                 return SYMBOL_A;
 164         if (b && !a)
 165                 return SYMBOL_B;
 166
 167         /* Prefer a symbol with less underscores */
 168         a = prefix_underscores_count(syma->name);
 169         b = prefix_underscores_count(symb->name);
 170         if (b > a)
 171                 return SYMBOL_A;
 172         else if (a > b)
 173                 return SYMBOL_B;
 174
 175         /* Choose the symbol with the longest name */
 176         na = strlen(syma->name);
 177         nb = strlen(symb->name);
 178         if (na > nb)
 179                 return SYMBOL_A;
 180         else if (na < nb)
 181                 return SYMBOL_B;
 182
 183         return arch__choose_best_symbol(syma, symb);
 184 }
 185
 186 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
 187 {
 188         struct rb_node *nd;
 189         struct symbol *curr, *next;
 190
 191         if (symbol_conf.allow_aliases)
 192                 return;
 193
 194         nd = rb_first_cached(symbols);
 195
 196         while (nd) {
 197                 curr = rb_entry(nd, struct symbol, rb_node);
 198 again:
 199                 nd = rb_next(&curr->rb_node);
 200                 next = rb_entry(nd, struct symbol, rb_node);
 201
 202                 if (!nd)
 203                         break;
 204
 205                 if (curr->start != next->start)
 206                         continue;
 207
 208                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 209                         rb_erase_cached(&next->rb_node, symbols);
 210                         symbol__delete(next);
 211                         goto again;
 212                 } else {
 213                         nd = rb_next(&curr->rb_node);
 214                         rb_erase_cached(&curr->rb_node, symbols);
 215                         symbol__delete(curr);
 216                 }
 217         }
 218 }
 219
 220 void symbols__fixup_end(struct rb_root_cached *symbols)
 221 {
 222         struct rb_node *nd, *prevnd = rb_first_cached(symbols);
 223         struct symbol *curr, *prev;
 224
 225         if (prevnd == NULL)
 226                 return;
 227
 228         curr = rb_entry(prevnd, struct symbol, rb_node);
 229
 230         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 231                 prev = curr;
 232                 curr = rb_entry(nd, struct symbol, rb_node);
 233
 234                 if (prev->end == prev->start && prev->end != curr->start)
 235                         arch__symbols__fixup_end(prev, curr);
 236         }
 237
 238         /* Last entry */
 239         if (curr->end == curr->start)
 240                 curr->end = roundup(curr->start, 4096) + 4096;
 241 }
 242
 243 void maps__fixup_end(struct maps *maps)
 244 {
 245         struct map *prev = NULL, *curr;
 246
 247         down_write(&maps->lock);
 248
 249         maps__for_each_entry(maps, curr) {
 250                 if (prev != NULL && !prev->end)
 251                         prev->end = curr->start;
 252
 253                 prev = curr;
 254         }
 255
 256         /*
 257          * We still haven't the actual symbols, so guess the
 258          * last map final address.
 259          */
 260         if (curr && !curr->end)
 261                 curr->end = ~0ULL;
 262
 263         up_write(&maps->lock);
 264 }
 265
 266 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
 267 {
 268         size_t namelen = strlen(name) + 1;
 269         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 270                                         sizeof(*sym) + namelen));
 271         if (sym == NULL)
 272                 return NULL;
 273
 274         if (symbol_conf.priv_size) {
 275                 if (symbol_conf.init_annotation) {
 276                         struct annotation *notes = (void *)sym;
 277                         pthread_mutex_init(&notes->lock, NULL);
 278                 }
 279                 sym = ((void *)sym) + symbol_conf.priv_size;
 280         }
 281
 282         sym->start   = start;
 283         sym->end     = len ? start + len : start;
 284         sym->type    = type;
 285         sym->binding = binding;
 286         sym->namelen = namelen - 1;
 287
 288         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 289                   __func__, name, start, sym->end);
 290         memcpy(sym->name, name, namelen);
 291
 292         return sym;
 293 }
 294
 295 void symbol__delete(struct symbol *sym)
 296 {
 297         free(((void *)sym) - symbol_conf.priv_size);
 298 }
 299
 300 void symbols__delete(struct rb_root_cached *symbols)
 301 {
 302         struct symbol *pos;
 303         struct rb_node *next = rb_first_cached(symbols);
 304
 305         while (next) {
 306                 pos = rb_entry(next, struct symbol, rb_node);
 307                 next = rb_next(&pos->rb_node);
 308                 rb_erase_cached(&pos->rb_node, symbols);
 309                 symbol__delete(pos);
 310         }
 311 }
 312
 313 void __symbols__insert(struct rb_root_cached *symbols,
 314                        struct symbol *sym, bool kernel)
 315 {
 316         struct rb_node **p = &symbols->rb_root.rb_node;
 317         struct rb_node *parent = NULL;
 318         const u64 ip = sym->start;
 319         struct symbol *s;
 320         bool leftmost = true;
 321
 322         if (kernel) {
 323                 const char *name = sym->name;
 324                 /*
 325                  * ppc64 uses function descriptors and appends a '.' to the
 326                  * start of every instruction address. Remove it.
 327                  */
 328                 if (name[0] == '.')
 329                         name++;
 330                 sym->idle = symbol__is_idle(name);
 331         }
 332
 333         while (*p != NULL) {
 334                 parent = *p;
 335                 s = rb_entry(parent, struct symbol, rb_node);
 336                 if (ip < s->start)
 337                         p = &(*p)->rb_left;
 338                 else {
 339                         p = &(*p)->rb_right;
 340                         leftmost = false;
 341                 }
 342         }
 343         rb_link_node(&sym->rb_node, parent, p);
 344         rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
 345 }
 346
 347 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
 348 {
 349         __symbols__insert(symbols, sym, false);
 350 }
 351
 352 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
 353 {
 354         struct rb_node *n;
 355
 356         if (symbols == NULL)
 357                 return NULL;
 358
 359         n = symbols->rb_root.rb_node;
 360
 361         while (n) {
 362                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 363
 364                 if (ip < s->start)
 365                         n = n->rb_left;
 366                 else if (ip > s->end || (ip == s->end && ip != s->start))
 367                         n = n->rb_right;
 368                 else
 369                         return s;
 370         }
 371
 372         return NULL;
 373 }
 374
 375 static struct symbol *symbols__first(struct rb_root_cached *symbols)
 376 {
 377         struct rb_node *n = rb_first_cached(symbols);
 378
 379         if (n)
 380                 return rb_entry(n, struct symbol, rb_node);
 381
 382         return NULL;
 383 }
 384
 385 static struct symbol *symbols__last(struct rb_root_cached *symbols)
 386 {
 387         struct rb_node *n = rb_last(&symbols->rb_root);
 388
 389         if (n)
 390                 return rb_entry(n, struct symbol, rb_node);
 391
 392         return NULL;
 393 }
 394
 395 static struct symbol *symbols__next(struct symbol *sym)
 396 {
 397         struct rb_node *n = rb_next(&sym->rb_node);
 398
 399         if (n)
 400                 return rb_entry(n, struct symbol, rb_node);
 401
 402         return NULL;
 403 }
 404
 405 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
 406 {
 407         struct rb_node **p = &symbols->rb_root.rb_node;
 408         struct rb_node *parent = NULL;
 409         struct symbol_name_rb_node *symn, *s;
 410         bool leftmost = true;
 411
 412         symn = container_of(sym, struct symbol_name_rb_node, sym);
 413
 414         while (*p != NULL) {
 415                 parent = *p;
 416                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 417                 if (strcmp(sym->name, s->sym.name) < 0)
 418                         p = &(*p)->rb_left;
 419                 else {
 420                         p = &(*p)->rb_right;
 421                         leftmost = false;
 422                 }
 423         }
 424         rb_link_node(&symn->rb_node, parent, p);
 425         rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
 426 }
 427
 428 static void symbols__sort_by_name(struct rb_root_cached *symbols,
 429                                   struct rb_root_cached *source)
 430 {
 431         struct rb_node *nd;
 432
 433         for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
 434                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 435                 symbols__insert_by_name(symbols, pos);
 436         }
 437 }
 438
 439 int symbol__match_symbol_name(const char *name, const char *str,
 440                               enum symbol_tag_include includes)
 441 {
 442         const char *versioning;
 443
 444         if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
 445             (versioning = strstr(name, "@@"))) {
 446                 int len = strlen(str);
 447
 448                 if (len < versioning - name)
 449                         len = versioning - name;
 450
 451                 return arch__compare_symbol_names_n(name, str, len);
 452         } else
 453                 return arch__compare_symbol_names(name, str);
 454 }
 455
 456 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
 457                                             const char *name,
 458                                             enum symbol_tag_include includes)
 459 {
 460         struct rb_node *n;
 461         struct symbol_name_rb_node *s = NULL;
 462
 463         if (symbols == NULL)
 464                 return NULL;
 465
 466         n = symbols->rb_root.rb_node;
 467
 468         while (n) {
 469                 int cmp;
 470
 471                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 472                 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
 473
 474                 if (cmp > 0)
 475                         n = n->rb_left;
 476                 else if (cmp < 0)
 477                         n = n->rb_right;
 478                 else
 479                         break;
 480         }
 481
 482         if (n == NULL)
 483                 return NULL;
 484
 485         if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
 486                 /* return first symbol that has same name (if any) */
 487                 for (n = rb_prev(n); n; n = rb_prev(n)) {
 488                         struct symbol_name_rb_node *tmp;
 489
 490                         tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 491                         if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
 492                                 break;
 493
 494                         s = tmp;
 495                 }
 496
 497         return &s->sym;
 498 }
 499
 500 void dso__reset_find_symbol_cache(struct dso *dso)
 501 {
 502         dso->last_find_result.addr   = 0;
 503         dso->last_find_result.symbol = NULL;
 504 }
 505
 506 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
 507 {
 508         __symbols__insert(&dso->symbols, sym, dso->kernel);
 509
 510         /* update the symbol cache if necessary */
 511         if (dso->last_find_result.addr >= sym->start &&
 512             (dso->last_find_result.addr < sym->end ||
 513             sym->start == sym->end)) {
 514                 dso->last_find_result.symbol = sym;
 515         }
 516 }
 517
 518 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
 519 {
 520         if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
 521                 dso->last_find_result.addr   = addr;
 522                 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
 523         }
 524
 525         return dso->last_find_result.symbol;
 526 }
 527
 528 struct symbol *dso__first_symbol(struct dso *dso)
 529 {
 530         return symbols__first(&dso->symbols);
 531 }
 532
 533 struct symbol *dso__last_symbol(struct dso *dso)
 534 {
 535         return symbols__last(&dso->symbols);
 536 }
 537
 538 struct symbol *dso__next_symbol(struct symbol *sym)
 539 {
 540         return symbols__next(sym);
 541 }
 542
 543 struct symbol *symbol__next_by_name(struct symbol *sym)
 544 {
 545         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 546         struct rb_node *n = rb_next(&s->rb_node);
 547
 548         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 549 }
 550
 551  /*
 552   * Returns first symbol that matched with @name.
 553   */
 554 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
 555 {
 556         struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
 557                                                  SYMBOL_TAG_INCLUDE__NONE);
 558         if (!s)
 559                 s = symbols__find_by_name(&dso->symbol_names, name,
 560                                           SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
 561         return s;
 562 }
 563
 564 void dso__sort_by_name(struct dso *dso)
 565 {
 566         dso__set_sorted_by_name(dso);
 567         return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
 568 }
 569
 570 /*
 571  * While we find nice hex chars, build a long_val.
 572  * Return number of chars processed.
 573  */
 574 static int hex2u64(const char *ptr, u64 *long_val)
 575 {
 576         char *p;
 577
 578         *long_val = strtoull(ptr, &p, 16);
 579
 580         return p - ptr;
 581 }
 582
 583
 584 int modules__parse(const char *filename, void *arg,
 585                    int (*process_module)(void *arg, const char *name,
 586                                          u64 start, u64 size))
 587 {
 588         char *line = NULL;
 589         size_t n;
 590         FILE *file;
 591         int err = 0;
 592
 593         file = fopen(filename, "r");
 594         if (file == NULL)
 595                 return -1;
 596
 597         while (1) {
 598                 char name[PATH_MAX];
 599                 u64 start, size;
 600                 char *sep, *endptr;
 601                 ssize_t line_len;
 602
 603                 line_len = getline(&line, &n, file);
 604                 if (line_len < 0) {
 605                         if (feof(file))
 606                                 break;
 607                         err = -1;
 608                         goto out;
 609                 }
 610
 611                 if (!line) {
 612                         err = -1;
 613                         goto out;
 614                 }
 615
 616                 line[--line_len] = '\0'; /* \n */
 617
 618                 sep = strrchr(line, 'x');
 619                 if (sep == NULL)
 620                         continue;
 621
 622                 hex2u64(sep + 1, &start);
 623
 624                 sep = strchr(line, ' ');
 625                 if (sep == NULL)
 626                         continue;
 627
 628                 *sep = '\0';
 629
 630                 scnprintf(name, sizeof(name), "[%s]", line);
 631
 632                 size = strtoul(sep + 1, &endptr, 0);
 633                 if (*endptr != ' ' && *endptr != '\t')
 634                         continue;
 635
 636                 err = process_module(arg, name, start, size);
 637                 if (err)
 638                         break;
 639         }
 640 out:
 641         free(line);
 642         fclose(file);
 643         return err;
 644 }
 645
 646 /*
 647  * These are symbols in the kernel image, so make sure that
 648  * sym is from a kernel DSO.
 649  */
 650 static bool symbol__is_idle(const char *name)
 651 {
 652         const char * const idle_symbols[] = {
 653                 "acpi_idle_do_entry",
 654                 "acpi_processor_ffh_cstate_enter",
 655                 "arch_cpu_idle",
 656                 "cpu_idle",
 657                 "cpu_startup_entry",
 658                 "idle_cpu",
 659                 "intel_idle",
 660                 "default_idle",
 661                 "native_safe_halt",
 662                 "enter_idle",
 663                 "exit_idle",
 664                 "mwait_idle",
 665                 "mwait_idle_with_hints",
 666                 "mwait_idle_with_hints.constprop.0",
 667                 "poll_idle",
 668                 "ppc64_runlatch_off",
 669                 "pseries_dedicated_idle_sleep",
 670                 "psw_idle",
 671                 "psw_idle_exit",
 672                 NULL
 673         };
 674         int i;
 675         static struct strlist *idle_symbols_list;
 676
 677         if (idle_symbols_list)
 678                 return strlist__has_entry(idle_symbols_list, name);
 679
 680         idle_symbols_list = strlist__new(NULL, NULL);
 681
 682         for (i = 0; idle_symbols[i]; i++)
 683                 strlist__add(idle_symbols_list, idle_symbols[i]);
 684
 685         return strlist__has_entry(idle_symbols_list, name);
 686 }
 687
 688 static int map__process_kallsym_symbol(void *arg, const char *name,
 689                                        char type, u64 start)
 690 {
 691         struct symbol *sym;
 692         struct dso *dso = arg;
 693         struct rb_root_cached *root = &dso->symbols;
 694
 695         if (!symbol_type__filter(type))
 696                 return 0;
 697
 698         /*
 699          * module symbols are not sorted so we add all
 700          * symbols, setting length to 0, and rely on
 701          * symbols__fixup_end() to fix it up.
 702          */
 703         sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 704         if (sym == NULL)
 705                 return -ENOMEM;
 706         /*
 707          * We will pass the symbols to the filter later, in
 708          * map__split_kallsyms, when we have split the maps per module
 709          */
 710         __symbols__insert(root, sym, !strchr(name, '['));
 711
 712         return 0;
 713 }
 714
 715 /*
 716  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 717  * so that we can in the next step set the symbol ->end address and then
 718  * call kernel_maps__split_kallsyms.
 719  */
 720 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 721 {
 722         return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 723 }
 724
 725 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
 726 {
 727         struct map *curr_map;
 728         struct symbol *pos;
 729         int count = 0;
 730         struct rb_root_cached old_root = dso->symbols;
 731         struct rb_root_cached *root = &dso->symbols;
 732         struct rb_node *next = rb_first_cached(root);
 733
 734         if (!kmaps)
 735                 return -1;
 736
 737         *root = RB_ROOT_CACHED;
 738
 739         while (next) {
 740                 char *module;
 741
 742                 pos = rb_entry(next, struct symbol, rb_node);
 743                 next = rb_next(&pos->rb_node);
 744
 745                 rb_erase_cached(&pos->rb_node, &old_root);
 746                 RB_CLEAR_NODE(&pos->rb_node);
 747                 module = strchr(pos->name, '\t');
 748                 if (module)
 749                         *module = '\0';
 750
 751                 curr_map = maps__find(kmaps, pos->start);
 752
 753                 if (!curr_map) {
 754                         symbol__delete(pos);
 755                         continue;
 756                 }
 757
 758                 pos->start -= curr_map->start - curr_map->pgoff;
 759                 if (pos->end > curr_map->end)
 760                         pos->end = curr_map->end;
 761                 if (pos->end)
 762                         pos->end -= curr_map->start - curr_map->pgoff;
 763                 symbols__insert(&curr_map->dso->symbols, pos);
 764                 ++count;
 765         }
 766
 767         /* Symbols have been adjusted */
 768         dso->adjust_symbols = 1;
 769
 770         return count;
 771 }
 772
 773 /*
 774  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 775  * kernel range is broken in several maps, named [kernel].N, as we don't have
 776  * the original ELF section names vmlinux have.
 777  */
 778 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 779                                 struct map *initial_map)
 780 {
 781         struct machine *machine;
 782         struct map *curr_map = initial_map;
 783         struct symbol *pos;
 784         int count = 0, moved = 0;
 785         struct rb_root_cached *root = &dso->symbols;
 786         struct rb_node *next = rb_first_cached(root);
 787         int kernel_range = 0;
 788         bool x86_64;
 789
 790         if (!kmaps)
 791                 return -1;
 792
 793         machine = kmaps->machine;
 794
 795         x86_64 = machine__is(machine, "x86_64");
 796
 797         while (next) {
 798                 char *module;
 799
 800                 pos = rb_entry(next, struct symbol, rb_node);
 801                 next = rb_next(&pos->rb_node);
 802
 803                 module = strchr(pos->name, '\t');
 804                 if (module) {
 805                         if (!symbol_conf.use_modules)
 806                                 goto discard_symbol;
 807
 808                         *module++ = '\0';
 809
 810                         if (strcmp(curr_map->dso->short_name, module)) {
 811                                 if (curr_map != initial_map &&
 812                                     dso->kernel == DSO_SPACE__KERNEL_GUEST &&
 813                                     machine__is_default_guest(machine)) {
 814                                         /*
 815                                          * We assume all symbols of a module are
 816                                          * continuous in * kallsyms, so curr_map
 817                                          * points to a module and all its
 818                                          * symbols are in its kmap. Mark it as
 819                                          * loaded.
 820                                          */
 821                                         dso__set_loaded(curr_map->dso);
 822                                 }
 823
 824                                 curr_map = maps__find_by_name(kmaps, module);
 825                                 if (curr_map == NULL) {
 826                                         pr_debug("%s/proc/{kallsyms,modules} "
 827                                                  "inconsistency while looking "
 828                                                  "for \"%s\" module!\n",
 829                                                  machine->root_dir, module);
 830                                         curr_map = initial_map;
 831                                         goto discard_symbol;
 832                                 }
 833
 834                                 if (curr_map->dso->loaded &&
 835                                     !machine__is_default_guest(machine))
 836                                         goto discard_symbol;
 837                         }
 838                         /*
 839                          * So that we look just like we get from .ko files,
 840                          * i.e. not prelinked, relative to initial_map->start.
 841                          */
 842                         pos->start = curr_map->map_ip(curr_map, pos->start);
 843                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 844                 } else if (x86_64 && is_entry_trampoline(pos->name)) {
 845                         /*
 846                          * These symbols are not needed anymore since the
 847                          * trampoline maps refer to the text section and it's
 848                          * symbols instead. Avoid having to deal with
 849                          * relocations, and the assumption that the first symbol
 850                          * is the start of kernel text, by simply removing the
 851                          * symbols at this point.
 852                          */
 853                         goto discard_symbol;
 854                 } else if (curr_map != initial_map) {
 855                         char dso_name[PATH_MAX];
 856                         struct dso *ndso;
 857
 858                         if (delta) {
 859                                 /* Kernel was relocated at boot time */
 860                                 pos->start -= delta;
 861                                 pos->end -= delta;
 862                         }
 863
 864                         if (count == 0) {
 865                                 curr_map = initial_map;
 866                                 goto add_symbol;
 867                         }
 868
 869                         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
 870                                 snprintf(dso_name, sizeof(dso_name),
 871                                         "[guest.kernel].%d",
 872                                         kernel_range++);
 873                         else
 874                                 snprintf(dso_name, sizeof(dso_name),
 875                                         "[kernel].%d",
 876                                         kernel_range++);
 877
 878                         ndso = dso__new(dso_name);
 879                         if (ndso == NULL)
 880                                 return -1;
 881
 882                         ndso->kernel = dso->kernel;
 883
 884                         curr_map = map__new2(pos->start, ndso);
 885                         if (curr_map == NULL) {
 886                                 dso__put(ndso);
 887                                 return -1;
 888                         }
 889
 890                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 891                         maps__insert(kmaps, curr_map);
 892                         ++kernel_range;
 893                 } else if (delta) {
 894                         /* Kernel was relocated at boot time */
 895                         pos->start -= delta;
 896                         pos->end -= delta;
 897                 }
 898 add_symbol:
 899                 if (curr_map != initial_map) {
 900                         rb_erase_cached(&pos->rb_node, root);
 901                         symbols__insert(&curr_map->dso->symbols, pos);
 902                         ++moved;
 903                 } else
 904                         ++count;
 905
 906                 continue;
 907 discard_symbol:
 908                 rb_erase_cached(&pos->rb_node, root);
 909                 symbol__delete(pos);
 910         }
 911
 912         if (curr_map != initial_map &&
 913             dso->kernel == DSO_SPACE__KERNEL_GUEST &&
 914             machine__is_default_guest(kmaps->machine)) {
 915                 dso__set_loaded(curr_map->dso);
 916         }
 917
 918         return count + moved;
 919 }
 920
 921 bool symbol__restricted_filename(const char *filename,
 922                                  const char *restricted_filename)
 923 {
 924         bool restricted = false;
 925
 926         if (symbol_conf.kptr_restrict) {
 927                 char *r = realpath(filename, NULL);
 928
 929                 if (r != NULL) {
 930                         restricted = strcmp(r, restricted_filename) == 0;
 931                         free(r);
 932                         return restricted;
 933                 }
 934         }
 935
 936         return restricted;
 937 }
 938
 939 struct module_info {
 940         struct rb_node rb_node;
 941         char *name;
 942         u64 start;
 943 };
 944
 945 static void add_module(struct module_info *mi, struct rb_root *modules)
 946 {
 947         struct rb_node **p = &modules->rb_node;
 948         struct rb_node *parent = NULL;
 949         struct module_info *m;
 950
 951         while (*p != NULL) {
 952                 parent = *p;
 953                 m = rb_entry(parent, struct module_info, rb_node);
 954                 if (strcmp(mi->name, m->name) < 0)
 955                         p = &(*p)->rb_left;
 956                 else
 957                         p = &(*p)->rb_right;
 958         }
 959         rb_link_node(&mi->rb_node, parent, p);
 960         rb_insert_color(&mi->rb_node, modules);
 961 }
 962
 963 static void delete_modules(struct rb_root *modules)
 964 {
 965         struct module_info *mi;
 966         struct rb_node *next = rb_first(modules);
 967
 968         while (next) {
 969                 mi = rb_entry(next, struct module_info, rb_node);
 970                 next = rb_next(&mi->rb_node);
 971                 rb_erase(&mi->rb_node, modules);
 972                 zfree(&mi->name);
 973                 free(mi);
 974         }
 975 }
 976
 977 static struct module_info *find_module(const char *name,
 978                                        struct rb_root *modules)
 979 {
 980         struct rb_node *n = modules->rb_node;
 981
 982         while (n) {
 983                 struct module_info *m;
 984                 int cmp;
 985
 986                 m = rb_entry(n, struct module_info, rb_node);
 987                 cmp = strcmp(name, m->name);
 988                 if (cmp < 0)
 989                         n = n->rb_left;
 990                 else if (cmp > 0)
 991                         n = n->rb_right;
 992                 else
 993                         return m;
 994         }
 995
 996         return NULL;
 997 }
 998
 999 static int __read_proc_modules(void *arg, const char *name, u64 start,
1000                                u64 size __maybe_unused)
1001 {
1002         struct rb_root *modules = arg;
1003         struct module_info *mi;
1004
1005         mi = zalloc(sizeof(struct module_info));
1006         if (!mi)
1007                 return -ENOMEM;
1008
1009         mi->name = strdup(name);
1010         mi->start = start;
1011
1012         if (!mi->name) {
1013                 free(mi);
1014                 return -ENOMEM;
1015         }
1016
1017         add_module(mi, modules);
1018
1019         return 0;
1020 }
1021
1022 static int read_proc_modules(const char *filename, struct rb_root *modules)
1023 {
1024         if (symbol__restricted_filename(filename, "/proc/modules"))
1025                 return -1;
1026
1027         if (modules__parse(filename, modules, __read_proc_modules)) {
1028                 delete_modules(modules);
1029                 return -1;
1030         }
1031
1032         return 0;
1033 }
1034
1035 int compare_proc_modules(const char *from, const char *to)
1036 {
1037         struct rb_root from_modules = RB_ROOT;
1038         struct rb_root to_modules = RB_ROOT;
1039         struct rb_node *from_node, *to_node;
1040         struct module_info *from_m, *to_m;
1041         int ret = -1;
1042
1043         if (read_proc_modules(from, &from_modules))
1044                 return -1;
1045
1046         if (read_proc_modules(to, &to_modules))
1047                 goto out_delete_from;
1048
1049         from_node = rb_first(&from_modules);
1050         to_node = rb_first(&to_modules);
1051         while (from_node) {
1052                 if (!to_node)
1053                         break;
1054
1055                 from_m = rb_entry(from_node, struct module_info, rb_node);
1056                 to_m = rb_entry(to_node, struct module_info, rb_node);
1057
1058                 if (from_m->start != to_m->start ||
1059                     strcmp(from_m->name, to_m->name))
1060                         break;
1061
1062                 from_node = rb_next(from_node);
1063                 to_node = rb_next(to_node);
1064         }
1065
1066         if (!from_node && !to_node)
1067                 ret = 0;
1068
1069         delete_modules(&to_modules);
1070 out_delete_from:
1071         delete_modules(&from_modules);
1072
1073         return ret;
1074 }
1075
1076 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1077 {
1078         struct rb_root modules = RB_ROOT;
1079         struct map *old_map;
1080         int err;
1081
1082         err = read_proc_modules(filename, &modules);
1083         if (err)
1084                 return err;
1085
1086         maps__for_each_entry(kmaps, old_map) {
1087                 struct module_info *mi;
1088
1089                 if (!__map__is_kmodule(old_map)) {
1090                         continue;
1091                 }
1092
1093                 /* Module must be in memory at the same address */
1094                 mi = find_module(old_map->dso->short_name, &modules);
1095                 if (!mi || mi->start != old_map->start) {
1096                         err = -EINVAL;
1097                         goto out;
1098                 }
1099         }
1100 out:
1101         delete_modules(&modules);
1102         return err;
1103 }
1104
1105 /*
1106  * If kallsyms is referenced by name then we look for filename in the same
1107  * directory.
1108  */
1109 static bool filename_from_kallsyms_filename(char *filename,
1110                                             const char *base_name,
1111                                             const char *kallsyms_filename)
1112 {
1113         char *name;
1114
1115         strcpy(filename, kallsyms_filename);
1116         name = strrchr(filename, '/');
1117         if (!name)
1118                 return false;
1119
1120         name += 1;
1121
1122         if (!strcmp(name, "kallsyms")) {
1123                 strcpy(name, base_name);
1124                 return true;
1125         }
1126
1127         return false;
1128 }
1129
1130 static int validate_kcore_modules(const char *kallsyms_filename,
1131                                   struct map *map)
1132 {
1133         struct maps *kmaps = map__kmaps(map);
1134         char modules_filename[PATH_MAX];
1135
1136         if (!kmaps)
1137                 return -EINVAL;
1138
1139         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1140                                              kallsyms_filename))
1141                 return -EINVAL;
1142
1143         if (do_validate_kcore_modules(modules_filename, kmaps))
1144                 return -EINVAL;
1145
1146         return 0;
1147 }
1148
1149 static int validate_kcore_addresses(const char *kallsyms_filename,
1150                                     struct map *map)
1151 {
1152         struct kmap *kmap = map__kmap(map);
1153
1154         if (!kmap)
1155                 return -EINVAL;
1156
1157         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1158                 u64 start;
1159
1160                 if (kallsyms__get_function_start(kallsyms_filename,
1161                                                  kmap->ref_reloc_sym->name, &start))
1162                         return -ENOENT;
1163                 if (start != kmap->ref_reloc_sym->addr)
1164                         return -EINVAL;
1165         }
1166
1167         return validate_kcore_modules(kallsyms_filename, map);
1168 }
1169
1170 struct kcore_mapfn_data {
1171         struct dso *dso;
1172         struct list_head maps;
1173 };
1174
1175 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1176 {
1177         struct kcore_mapfn_data *md = data;
1178         struct map *map;
1179
1180         map = map__new2(start, md->dso);
1181         if (map == NULL)
1182                 return -ENOMEM;
1183
1184         map->end = map->start + len;
1185         map->pgoff = pgoff;
1186
1187         list_add(&map->node, &md->maps);
1188
1189         return 0;
1190 }
1191
1192 /*
1193  * Merges map into maps by splitting the new map within the existing map
1194  * regions.
1195  */
1196 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1197 {
1198         struct map *old_map;
1199         LIST_HEAD(merged);
1200
1201         maps__for_each_entry(kmaps, old_map) {
1202                 /* no overload with this one */
1203                 if (new_map->end < old_map->start ||
1204                     new_map->start >= old_map->end)
1205                         continue;
1206
1207                 if (new_map->start < old_map->start) {
1208                         /*
1209                          * |new......
1210                          *       |old....
1211                          */
1212                         if (new_map->end < old_map->end) {
1213                                 /*
1214                                  * |new......|     -> |new..|
1215                                  *       |old....| ->       |old....|
1216                                  */
1217                                 new_map->end = old_map->start;
1218                         } else {
1219                                 /*
1220                                  * |new.............| -> |new..|       |new..|
1221                                  *       |old....|    ->       |old....|
1222                                  */
1223                                 struct map *m = map__clone(new_map);
1224
1225                                 if (!m)
1226                                         return -ENOMEM;
1227
1228                                 m->end = old_map->start;
1229                                 list_add_tail(&m->node, &merged);
1230                                 new_map->pgoff += old_map->end - new_map->start;
1231                                 new_map->start = old_map->end;
1232                         }
1233                 } else {
1234                         /*
1235                          *      |new......
1236                          * |old....
1237                          */
1238                         if (new_map->end < old_map->end) {
1239                                 /*
1240                                  *      |new..|   -> x
1241                                  * |old.........| -> |old.........|
1242                                  */
1243                                 map__put(new_map);
1244                                 new_map = NULL;
1245                                 break;
1246                         } else {
1247                                 /*
1248                                  *      |new......| ->         |new...|
1249                                  * |old....|        -> |old....|
1250                                  */
1251                                 new_map->pgoff += old_map->end - new_map->start;
1252                                 new_map->start = old_map->end;
1253                         }
1254                 }
1255         }
1256
1257         while (!list_empty(&merged)) {
1258                 old_map = list_entry(merged.next, struct map, node);
1259                 list_del_init(&old_map->node);
1260                 maps__insert(kmaps, old_map);
1261                 map__put(old_map);
1262         }
1263
1264         if (new_map) {
1265                 maps__insert(kmaps, new_map);
1266                 map__put(new_map);
1267         }
1268         return 0;
1269 }
1270
1271 static int dso__load_kcore(struct dso *dso, struct map *map,
1272                            const char *kallsyms_filename)
1273 {
1274         struct maps *kmaps = map__kmaps(map);
1275         struct kcore_mapfn_data md;
1276         struct map *old_map, *new_map, *replacement_map = NULL, *next;
1277         struct machine *machine;
1278         bool is_64_bit;
1279         int err, fd;
1280         char kcore_filename[PATH_MAX];
1281         u64 stext;
1282
1283         if (!kmaps)
1284                 return -EINVAL;
1285
1286         machine = kmaps->machine;
1287
1288         /* This function requires that the map is the kernel map */
1289         if (!__map__is_kernel(map))
1290                 return -EINVAL;
1291
1292         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1293                                              kallsyms_filename))
1294                 return -EINVAL;
1295
1296         /* Modules and kernel must be present at their original addresses */
1297         if (validate_kcore_addresses(kallsyms_filename, map))
1298                 return -EINVAL;
1299
1300         md.dso = dso;
1301         INIT_LIST_HEAD(&md.maps);
1302
1303         fd = open(kcore_filename, O_RDONLY);
1304         if (fd < 0) {
1305                 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1306                          kcore_filename);
1307                 return -EINVAL;
1308         }
1309
1310         /* Read new maps into temporary lists */
1311         err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1312                               &is_64_bit);
1313         if (err)
1314                 goto out_err;
1315         dso->is_64_bit = is_64_bit;
1316
1317         if (list_empty(&md.maps)) {
1318                 err = -EINVAL;
1319                 goto out_err;
1320         }
1321
1322         /* Remove old maps */
1323         maps__for_each_entry_safe(kmaps, old_map, next) {
1324                 /*
1325                  * We need to preserve eBPF maps even if they are
1326                  * covered by kcore, because we need to access
1327                  * eBPF dso for source data.
1328                  */
1329                 if (old_map != map && !__map__is_bpf_prog(old_map))
1330                         maps__remove(kmaps, old_map);
1331         }
1332         machine->trampolines_mapped = false;
1333
1334         /* Find the kernel map using the '_stext' symbol */
1335         if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1336                 list_for_each_entry(new_map, &md.maps, node) {
1337                         if (stext >= new_map->start && stext < new_map->end) {
1338                                 replacement_map = new_map;
1339                                 break;
1340                         }
1341                 }
1342         }
1343
1344         if (!replacement_map)
1345                 replacement_map = list_entry(md.maps.next, struct map, node);
1346
1347         /* Add new maps */
1348         while (!list_empty(&md.maps)) {
1349                 new_map = list_entry(md.maps.next, struct map, node);
1350                 list_del_init(&new_map->node);
1351                 if (new_map == replacement_map) {
1352                         map->start      = new_map->start;
1353                         map->end        = new_map->end;
1354                         map->pgoff      = new_map->pgoff;
1355                         map->map_ip     = new_map->map_ip;
1356                         map->unmap_ip   = new_map->unmap_ip;
1357                         /* Ensure maps are correctly ordered */
1358                         map__get(map);
1359                         maps__remove(kmaps, map);
1360                         maps__insert(kmaps, map);
1361                         map__put(map);
1362                         map__put(new_map);
1363                 } else {
1364                         /*
1365                          * Merge kcore map into existing maps,
1366                          * and ensure that current maps (eBPF)
1367                          * stay intact.
1368                          */
1369                         if (maps__merge_in(kmaps, new_map))
1370                                 goto out_err;
1371                 }
1372         }
1373
1374         if (machine__is(machine, "x86_64")) {
1375                 u64 addr;
1376
1377                 /*
1378                  * If one of the corresponding symbols is there, assume the
1379                  * entry trampoline maps are too.
1380                  */
1381                 if (!kallsyms__get_function_start(kallsyms_filename,
1382                                                   ENTRY_TRAMPOLINE_NAME,
1383                                                   &addr))
1384                         machine->trampolines_mapped = true;
1385         }
1386
1387         /*
1388          * Set the data type and long name so that kcore can be read via
1389          * dso__data_read_addr().
1390          */
1391         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1392                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1393         else
1394                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1395         dso__set_long_name(dso, strdup(kcore_filename), true);
1396
1397         close(fd);
1398
1399         if (map->prot & PROT_EXEC)
1400                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1401         else
1402                 pr_debug("Using %s for kernel data\n", kcore_filename);
1403
1404         return 0;
1405
1406 out_err:
1407         while (!list_empty(&md.maps)) {
1408                 map = list_entry(md.maps.next, struct map, node);
1409                 list_del_init(&map->node);
1410                 map__put(map);
1411         }
1412         close(fd);
1413         return -EINVAL;
1414 }
1415
1416 /*
1417  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1418  * delta based on the relocation reference symbol.
1419  */
1420 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1421 {
1422         u64 addr;
1423
1424         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1425                 return 0;
1426
1427         if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1428                 return -1;
1429
1430         *delta = addr - kmap->ref_reloc_sym->addr;
1431         return 0;
1432 }
1433
1434 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1435                          struct map *map, bool no_kcore)
1436 {
1437         struct kmap *kmap = map__kmap(map);
1438         u64 delta = 0;
1439
1440         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1441                 return -1;
1442
1443         if (!kmap || !kmap->kmaps)
1444                 return -1;
1445
1446         if (dso__load_all_kallsyms(dso, filename) < 0)
1447                 return -1;
1448
1449         if (kallsyms__delta(kmap, filename, &delta))
1450                 return -1;
1451
1452         symbols__fixup_end(&dso->symbols);
1453         symbols__fixup_duplicate(&dso->symbols);
1454
1455         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1456                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1457         else
1458                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1459
1460         if (!no_kcore && !dso__load_kcore(dso, map, filename))
1461                 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1462         else
1463                 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1464 }
1465
1466 int dso__load_kallsyms(struct dso *dso, const char *filename,
1467                        struct map *map)
1468 {
1469         return __dso__load_kallsyms(dso, filename, map, false);
1470 }
1471
1472 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1473 {
1474         char *line = NULL;
1475         size_t n;
1476         FILE *file;
1477         int nr_syms = 0;
1478
1479         file = fopen(map_path, "r");
1480         if (file == NULL)
1481                 goto out_failure;
1482
1483         while (!feof(file)) {
1484                 u64 start, size;
1485                 struct symbol *sym;
1486                 int line_len, len;
1487
1488                 line_len = getline(&line, &n, file);
1489                 if (line_len < 0)
1490                         break;
1491
1492                 if (!line)
1493                         goto out_failure;
1494
1495                 line[--line_len] = '\0'; /* \n */
1496
1497                 len = hex2u64(line, &start);
1498
1499                 len++;
1500                 if (len + 2 >= line_len)
1501                         continue;
1502
1503                 len += hex2u64(line + len, &size);
1504
1505                 len++;
1506                 if (len + 2 >= line_len)
1507                         continue;
1508
1509                 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1510
1511                 if (sym == NULL)
1512                         goto out_delete_line;
1513
1514                 symbols__insert(&dso->symbols, sym);
1515                 nr_syms++;
1516         }
1517
1518         free(line);
1519         fclose(file);
1520
1521         return nr_syms;
1522
1523 out_delete_line:
1524         free(line);
1525 out_failure:
1526         return -1;
1527 }
1528
1529 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1530                                            enum dso_binary_type type)
1531 {
1532         switch (type) {
1533         case DSO_BINARY_TYPE__JAVA_JIT:
1534         case DSO_BINARY_TYPE__DEBUGLINK:
1535         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1536         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1537         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1538         case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1539         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1540         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1541                 return !kmod && dso->kernel == DSO_SPACE__USER;
1542
1543         case DSO_BINARY_TYPE__KALLSYMS:
1544         case DSO_BINARY_TYPE__VMLINUX:
1545         case DSO_BINARY_TYPE__KCORE:
1546                 return dso->kernel == DSO_SPACE__KERNEL;
1547
1548         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1549         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1550         case DSO_BINARY_TYPE__GUEST_KCORE:
1551                 return dso->kernel == DSO_SPACE__KERNEL_GUEST;
1552
1553         case DSO_BINARY_TYPE__GUEST_KMODULE:
1554         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1555         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1556         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1557                 /*
1558                  * kernel modules know their symtab type - it's set when
1559                  * creating a module dso in machine__addnew_module_map().
1560                  */
1561                 return kmod && dso->symtab_type == type;
1562
1563         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1564         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1565                 return true;
1566
1567         case DSO_BINARY_TYPE__BPF_PROG_INFO:
1568         case DSO_BINARY_TYPE__BPF_IMAGE:
1569         case DSO_BINARY_TYPE__OOL:
1570         case DSO_BINARY_TYPE__NOT_FOUND:
1571         default:
1572                 return false;
1573         }
1574 }
1575
1576 /* Checks for the existence of the perf-<pid>.map file in two different
1577  * locations.  First, if the process is a separate mount namespace, check in
1578  * that namespace using the pid of the innermost pid namespace.  If's not in a
1579  * namespace, or the file can't be found there, try in the mount namespace of
1580  * the tracing process using our view of its pid.
1581  */
1582 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1583                               struct nsinfo **nsip)
1584 {
1585         struct nscookie nsc;
1586         struct nsinfo *nsi;
1587         struct nsinfo *nnsi;
1588         int rc = -1;
1589
1590         nsi = *nsip;
1591
1592         if (nsi->need_setns) {
1593                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1594                 nsinfo__mountns_enter(nsi, &nsc);
1595                 rc = access(filebuf, R_OK);
1596                 nsinfo__mountns_exit(&nsc);
1597                 if (rc == 0)
1598                         return rc;
1599         }
1600
1601         nnsi = nsinfo__copy(nsi);
1602         if (nnsi) {
1603                 nsinfo__put(nsi);
1604
1605                 nnsi->need_setns = false;
1606                 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1607                 *nsip = nnsi;
1608                 rc = 0;
1609         }
1610
1611         return rc;
1612 }
1613
1614 int dso__load(struct dso *dso, struct map *map)
1615 {
1616         char *name;
1617         int ret = -1;
1618         u_int i;
1619         struct machine *machine = NULL;
1620         char *root_dir = (char *) "";
1621         int ss_pos = 0;
1622         struct symsrc ss_[2];
1623         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1624         bool kmod;
1625         bool perfmap;
1626         unsigned char build_id[BUILD_ID_SIZE];
1627         struct nscookie nsc;
1628         char newmapname[PATH_MAX];
1629         const char *map_path = dso->long_name;
1630
1631         perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1632         if (perfmap) {
1633                 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1634                     sizeof(newmapname), &dso->nsinfo) == 0)) {
1635                         map_path = newmapname;
1636                 }
1637         }
1638
1639         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1640         pthread_mutex_lock(&dso->lock);
1641
1642         /* check again under the dso->lock */
1643         if (dso__loaded(dso)) {
1644                 ret = 1;
1645                 goto out;
1646         }
1647
1648         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1649                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1650                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1651                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1652
1653         if (dso->kernel && !kmod) {
1654                 if (dso->kernel == DSO_SPACE__KERNEL)
1655                         ret = dso__load_kernel_sym(dso, map);
1656                 else if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1657                         ret = dso__load_guest_kernel_sym(dso, map);
1658
1659                 machine = map__kmaps(map)->machine;
1660                 if (machine__is(machine, "x86_64"))
1661                         machine__map_x86_64_entry_trampolines(machine, dso);
1662                 goto out;
1663         }
1664
1665         dso->adjust_symbols = 0;
1666
1667         if (perfmap) {
1668                 ret = dso__load_perf_map(map_path, dso);
1669                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1670                                              DSO_BINARY_TYPE__NOT_FOUND;
1671                 goto out;
1672         }
1673
1674         if (machine)
1675                 root_dir = machine->root_dir;
1676
1677         name = malloc(PATH_MAX);
1678         if (!name)
1679                 goto out;
1680
1681         /*
1682          * Read the build id if possible. This is required for
1683          * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1684          */
1685         if (!dso->has_build_id &&
1686             is_regular_file(dso->long_name)) {
1687             __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1688             if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1689                 dso__set_build_id(dso, build_id);
1690         }
1691
1692         /*
1693          * Iterate over candidate debug images.
1694          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1695          * and/or opd section) for processing.
1696          */
1697         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1698                 struct symsrc *ss = &ss_[ss_pos];
1699                 bool next_slot = false;
1700                 bool is_reg;
1701                 bool nsexit;
1702                 int sirc = -1;
1703
1704                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1705
1706                 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1707                     symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1708
1709                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1710                         continue;
1711
1712                 if (dso__read_binary_type_filename(dso, symtab_type,
1713                                                    root_dir, name, PATH_MAX))
1714                         continue;
1715
1716                 if (nsexit)
1717                         nsinfo__mountns_exit(&nsc);
1718
1719                 is_reg = is_regular_file(name);
1720                 if (is_reg)
1721                         sirc = symsrc__init(ss, dso, name, symtab_type);
1722
1723                 if (nsexit)
1724                         nsinfo__mountns_enter(dso->nsinfo, &nsc);
1725
1726                 if (!is_reg || sirc < 0)
1727                         continue;
1728
1729                 if (!syms_ss && symsrc__has_symtab(ss)) {
1730                         syms_ss = ss;
1731                         next_slot = true;
1732                         if (!dso->symsrc_filename)
1733                                 dso->symsrc_filename = strdup(name);
1734                 }
1735
1736                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1737                         runtime_ss = ss;
1738                         next_slot = true;
1739                 }
1740
1741                 if (next_slot) {
1742                         ss_pos++;
1743
1744                         if (syms_ss && runtime_ss)
1745                                 break;
1746                 } else {
1747                         symsrc__destroy(ss);
1748                 }
1749
1750         }
1751
1752         if (!runtime_ss && !syms_ss)
1753                 goto out_free;
1754
1755         if (runtime_ss && !syms_ss) {
1756                 syms_ss = runtime_ss;
1757         }
1758
1759         /* We'll have to hope for the best */
1760         if (!runtime_ss && syms_ss)
1761                 runtime_ss = syms_ss;
1762
1763         if (syms_ss)
1764                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1765         else
1766                 ret = -1;
1767
1768         if (ret > 0) {
1769                 int nr_plt;
1770
1771                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1772                 if (nr_plt > 0)
1773                         ret += nr_plt;
1774         }
1775
1776         for (; ss_pos > 0; ss_pos--)
1777                 symsrc__destroy(&ss_[ss_pos - 1]);
1778 out_free:
1779         free(name);
1780         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1781                 ret = 0;
1782 out:
1783         dso__set_loaded(dso);
1784         pthread_mutex_unlock(&dso->lock);
1785         nsinfo__mountns_exit(&nsc);
1786
1787         return ret;
1788 }
1789
1790 static int map__strcmp(const void *a, const void *b)
1791 {
1792         const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1793         return strcmp(ma->dso->short_name, mb->dso->short_name);
1794 }
1795
1796 static int map__strcmp_name(const void *name, const void *b)
1797 {
1798         const struct map *map = *(const struct map **)b;
1799         return strcmp(name, map->dso->short_name);
1800 }
1801
1802 void __maps__sort_by_name(struct maps *maps)
1803 {
1804         qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1805 }
1806
1807 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1808 {
1809         struct map *map;
1810         struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1811         int i = 0;
1812
1813         if (maps_by_name == NULL)
1814                 return -1;
1815
1816         maps->maps_by_name = maps_by_name;
1817         maps->nr_maps_allocated = maps->nr_maps;
1818
1819         maps__for_each_entry(maps, map)
1820                 maps_by_name[i++] = map;
1821
1822         __maps__sort_by_name(maps);
1823         return 0;
1824 }
1825
1826 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1827 {
1828         struct map **mapp;
1829
1830         if (maps->maps_by_name == NULL &&
1831             map__groups__sort_by_name_from_rbtree(maps))
1832                 return NULL;
1833
1834         mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1835         if (mapp)
1836                 return *mapp;
1837         return NULL;
1838 }
1839
1840 struct map *maps__find_by_name(struct maps *maps, const char *name)
1841 {
1842         struct map *map;
1843
1844         down_read(&maps->lock);
1845
1846         if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1847                 map = maps->last_search_by_name;
1848                 goto out_unlock;
1849         }
1850         /*
1851          * If we have maps->maps_by_name, then the name isn't in the rbtree,
1852          * as maps->maps_by_name mirrors the rbtree when lookups by name are
1853          * made.
1854          */
1855         map = __maps__find_by_name(maps, name);
1856         if (map || maps->maps_by_name != NULL)
1857                 goto out_unlock;
1858
1859         /* Fallback to traversing the rbtree... */
1860         maps__for_each_entry(maps, map)
1861                 if (strcmp(map->dso->short_name, name) == 0) {
1862                         maps->last_search_by_name = map;
1863                         goto out_unlock;
1864                 }
1865
1866         map = NULL;
1867
1868 out_unlock:
1869         up_read(&maps->lock);
1870         return map;
1871 }
1872
1873 int dso__load_vmlinux(struct dso *dso, struct map *map,
1874                       const char *vmlinux, bool vmlinux_allocated)
1875 {
1876         int err = -1;
1877         struct symsrc ss;
1878         char symfs_vmlinux[PATH_MAX];
1879         enum dso_binary_type symtab_type;
1880
1881         if (vmlinux[0] == '/')
1882                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1883         else
1884                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1885
1886         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1887                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1888         else
1889                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1890
1891         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1892                 return -1;
1893
1894         err = dso__load_sym(dso, map, &ss, &ss, 0);
1895         symsrc__destroy(&ss);
1896
1897         if (err > 0) {
1898                 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1899                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1900                 else
1901                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1902                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1903                 dso__set_loaded(dso);
1904                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1905         }
1906
1907         return err;
1908 }
1909
1910 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1911 {
1912         int i, err = 0;
1913         char *filename = NULL;
1914
1915         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1916                  vmlinux_path__nr_entries + 1);
1917
1918         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1919                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1920                 if (err > 0)
1921                         goto out;
1922         }
1923
1924         if (!symbol_conf.ignore_vmlinux_buildid)
1925                 filename = dso__build_id_filename(dso, NULL, 0, false);
1926         if (filename != NULL) {
1927                 err = dso__load_vmlinux(dso, map, filename, true);
1928                 if (err > 0)
1929                         goto out;
1930                 free(filename);
1931         }
1932 out:
1933         return err;
1934 }
1935
1936 static bool visible_dir_filter(const char *name, struct dirent *d)
1937 {
1938         if (d->d_type != DT_DIR)
1939                 return false;
1940         return lsdir_no_dot_filter(name, d);
1941 }
1942
1943 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1944 {
1945         char kallsyms_filename[PATH_MAX];
1946         int ret = -1;
1947         struct strlist *dirs;
1948         struct str_node *nd;
1949
1950         dirs = lsdir(dir, visible_dir_filter);
1951         if (!dirs)
1952                 return -1;
1953
1954         strlist__for_each_entry(nd, dirs) {
1955                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1956                           "%s/%s/kallsyms", dir, nd->s);
1957                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1958                         strlcpy(dir, kallsyms_filename, dir_sz);
1959                         ret = 0;
1960                         break;
1961                 }
1962         }
1963
1964         strlist__delete(dirs);
1965
1966         return ret;
1967 }
1968
1969 /*
1970  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1971  * since access(R_OK) only checks with real UID/GID but open() use effective
1972  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1973  */
1974 static bool filename__readable(const char *file)
1975 {
1976         int fd = open(file, O_RDONLY);
1977         if (fd < 0)
1978                 return false;
1979         close(fd);
1980         return true;
1981 }
1982
1983 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1984 {
1985         u8 host_build_id[BUILD_ID_SIZE];
1986         char sbuild_id[SBUILD_ID_SIZE];
1987         bool is_host = false;
1988         char path[PATH_MAX];
1989
1990         if (!dso->has_build_id) {
1991                 /*
1992                  * Last resort, if we don't have a build-id and couldn't find
1993                  * any vmlinux file, try the running kernel kallsyms table.
1994                  */
1995                 goto proc_kallsyms;
1996         }
1997
1998         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1999                                  sizeof(host_build_id)) == 0)
2000                 is_host = dso__build_id_equal(dso, host_build_id);
2001
2002         /* Try a fast path for /proc/kallsyms if possible */
2003         if (is_host) {
2004                 /*
2005                  * Do not check the build-id cache, unless we know we cannot use
2006                  * /proc/kcore or module maps don't match to /proc/kallsyms.
2007                  * To check readability of /proc/kcore, do not use access(R_OK)
2008                  * since /proc/kcore requires CAP_SYS_RAWIO to read and access
2009                  * can't check it.
2010                  */
2011                 if (filename__readable("/proc/kcore") &&
2012                     !validate_kcore_addresses("/proc/kallsyms", map))
2013                         goto proc_kallsyms;
2014         }
2015
2016         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
2017
2018         /* Find kallsyms in build-id cache with kcore */
2019         scnprintf(path, sizeof(path), "%s/%s/%s",
2020                   buildid_dir, DSO__NAME_KCORE, sbuild_id);
2021
2022         if (!find_matching_kcore(map, path, sizeof(path)))
2023                 return strdup(path);
2024
2025         /* Use current /proc/kallsyms if possible */
2026         if (is_host) {
2027 proc_kallsyms:
2028                 return strdup("/proc/kallsyms");
2029         }
2030
2031         /* Finally, find a cache of kallsyms */
2032         if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2033                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2034                        sbuild_id);
2035                 return NULL;
2036         }
2037
2038         return strdup(path);
2039 }
2040
2041 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2042 {
2043         int err;
2044         const char *kallsyms_filename = NULL;
2045         char *kallsyms_allocated_filename = NULL;
2046         /*
2047          * Step 1: if the user specified a kallsyms or vmlinux filename, use
2048          * it and only it, reporting errors to the user if it cannot be used.
2049          *
2050          * For instance, try to analyse an ARM perf.data file _without_ a
2051          * build-id, or if the user specifies the wrong path to the right
2052          * vmlinux file, obviously we can't fallback to another vmlinux (a
2053          * x86_86 one, on the machine where analysis is being performed, say),
2054          * or worse, /proc/kallsyms.
2055          *
2056          * If the specified file _has_ a build-id and there is a build-id
2057          * section in the perf.data file, we will still do the expected
2058          * validation in dso__load_vmlinux and will bail out if they don't
2059          * match.
2060          */
2061         if (symbol_conf.kallsyms_name != NULL) {
2062                 kallsyms_filename = symbol_conf.kallsyms_name;
2063                 goto do_kallsyms;
2064         }
2065
2066         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2067                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2068         }
2069
2070         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2071                 err = dso__load_vmlinux_path(dso, map);
2072                 if (err > 0)
2073                         return err;
2074         }
2075
2076         /* do not try local files if a symfs was given */
2077         if (symbol_conf.symfs[0] != 0)
2078                 return -1;
2079
2080         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2081         if (!kallsyms_allocated_filename)
2082                 return -1;
2083
2084         kallsyms_filename = kallsyms_allocated_filename;
2085
2086 do_kallsyms:
2087         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2088         if (err > 0)
2089                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2090         free(kallsyms_allocated_filename);
2091
2092         if (err > 0 && !dso__is_kcore(dso)) {
2093                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2094                 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2095                 map__fixup_start(map);
2096                 map__fixup_end(map);
2097         }
2098
2099         return err;
2100 }
2101
2102 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2103 {
2104         int err;
2105         const char *kallsyms_filename = NULL;
2106         struct machine *machine = map__kmaps(map)->machine;
2107         char path[PATH_MAX];
2108
2109         if (machine__is_default_guest(machine)) {
2110                 /*
2111                  * if the user specified a vmlinux filename, use it and only
2112                  * it, reporting errors to the user if it cannot be used.
2113                  * Or use file guest_kallsyms inputted by user on commandline
2114                  */
2115                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2116                         err = dso__load_vmlinux(dso, map,
2117                                                 symbol_conf.default_guest_vmlinux_name,
2118                                                 false);
2119                         return err;
2120                 }
2121
2122                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2123                 if (!kallsyms_filename)
2124                         return -1;
2125         } else {
2126                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2127                 kallsyms_filename = path;
2128         }
2129
2130         err = dso__load_kallsyms(dso, kallsyms_filename, map);
2131         if (err > 0)
2132                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2133         if (err > 0 && !dso__is_kcore(dso)) {
2134                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2135                 dso__set_long_name(dso, machine->mmap_name, false);
2136                 map__fixup_start(map);
2137                 map__fixup_end(map);
2138         }
2139
2140         return err;
2141 }
2142
2143 static void vmlinux_path__exit(void)
2144 {
2145         while (--vmlinux_path__nr_entries >= 0)
2146                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2147         vmlinux_path__nr_entries = 0;
2148
2149         zfree(&vmlinux_path);
2150 }
2151
2152 static const char * const vmlinux_paths[] = {
2153         "vmlinux",
2154         "/boot/vmlinux"
2155 };
2156
2157 static const char * const vmlinux_paths_upd[] = {
2158         "/boot/vmlinux-%s",
2159         "/usr/lib/debug/boot/vmlinux-%s",
2160         "/lib/modules/%s/build/vmlinux",
2161         "/usr/lib/debug/lib/modules/%s/vmlinux",
2162         "/usr/lib/debug/boot/vmlinux-%s.debug"
2163 };
2164
2165 static int vmlinux_path__add(const char *new_entry)
2166 {
2167         vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2168         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2169                 return -1;
2170         ++vmlinux_path__nr_entries;
2171
2172         return 0;
2173 }
2174
2175 static int vmlinux_path__init(struct perf_env *env)
2176 {
2177         struct utsname uts;
2178         char bf[PATH_MAX];
2179         char *kernel_version;
2180         unsigned int i;
2181
2182         vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2183                               ARRAY_SIZE(vmlinux_paths_upd)));
2184         if (vmlinux_path == NULL)
2185                 return -1;
2186
2187         for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2188                 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2189                         goto out_fail;
2190
2191         /* only try kernel version if no symfs was given */
2192         if (symbol_conf.symfs[0] != 0)
2193                 return 0;
2194
2195         if (env) {
2196                 kernel_version = env->os_release;
2197         } else {
2198                 if (uname(&uts) < 0)
2199                         goto out_fail;
2200
2201                 kernel_version = uts.release;
2202         }
2203
2204         for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2205                 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2206                 if (vmlinux_path__add(bf) < 0)
2207                         goto out_fail;
2208         }
2209
2210         return 0;
2211
2212 out_fail:
2213         vmlinux_path__exit();
2214         return -1;
2215 }
2216
2217 int setup_list(struct strlist **list, const char *list_str,
2218                       const char *list_name)
2219 {
2220         if (list_str == NULL)
2221                 return 0;
2222
2223         *list = strlist__new(list_str, NULL);
2224         if (!*list) {
2225                 pr_err("problems parsing %s list\n", list_name);
2226                 return -1;
2227         }
2228
2229         symbol_conf.has_filter = true;
2230         return 0;
2231 }
2232
2233 int setup_intlist(struct intlist **list, const char *list_str,
2234                   const char *list_name)
2235 {
2236         if (list_str == NULL)
2237                 return 0;
2238
2239         *list = intlist__new(list_str);
2240         if (!*list) {
2241                 pr_err("problems parsing %s list\n", list_name);
2242                 return -1;
2243         }
2244         return 0;
2245 }
2246
2247 static bool symbol__read_kptr_restrict(void)
2248 {
2249         bool value = false;
2250         FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2251
2252         if (fp != NULL) {
2253                 char line[8];
2254
2255                 if (fgets(line, sizeof(line), fp) != NULL)
2256                         value = perf_cap__capable(CAP_SYSLOG) ?
2257                                         (atoi(line) >= 2) :
2258                                         (atoi(line) != 0);
2259
2260                 fclose(fp);
2261         }
2262
2263         /* Per kernel/kallsyms.c:
2264          * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2265          */
2266         if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2267                 value = true;
2268
2269         return value;
2270 }
2271
2272 int symbol__annotation_init(void)
2273 {
2274         if (symbol_conf.init_annotation)
2275                 return 0;
2276
2277         if (symbol_conf.initialized) {
2278                 pr_err("Annotation needs to be init before symbol__init()\n");
2279                 return -1;
2280         }
2281
2282         symbol_conf.priv_size += sizeof(struct annotation);
2283         symbol_conf.init_annotation = true;
2284         return 0;
2285 }
2286
2287 int symbol__init(struct perf_env *env)
2288 {
2289         const char *symfs;
2290
2291         if (symbol_conf.initialized)
2292                 return 0;
2293
2294         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2295
2296         symbol__elf_init();
2297
2298         if (symbol_conf.sort_by_name)
2299                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2300                                           sizeof(struct symbol));
2301
2302         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2303                 return -1;
2304
2305         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2306                 pr_err("'.' is the only non valid --field-separator argument\n");
2307                 return -1;
2308         }
2309
2310         if (setup_list(&symbol_conf.dso_list,
2311                        symbol_conf.dso_list_str, "dso") < 0)
2312                 return -1;
2313
2314         if (setup_list(&symbol_conf.comm_list,
2315                        symbol_conf.comm_list_str, "comm") < 0)
2316                 goto out_free_dso_list;
2317
2318         if (setup_intlist(&symbol_conf.pid_list,
2319                        symbol_conf.pid_list_str, "pid") < 0)
2320                 goto out_free_comm_list;
2321
2322         if (setup_intlist(&symbol_conf.tid_list,
2323                        symbol_conf.tid_list_str, "tid") < 0)
2324                 goto out_free_pid_list;
2325
2326         if (setup_list(&symbol_conf.sym_list,
2327                        symbol_conf.sym_list_str, "symbol") < 0)
2328                 goto out_free_tid_list;
2329
2330         if (setup_list(&symbol_conf.bt_stop_list,
2331                        symbol_conf.bt_stop_list_str, "symbol") < 0)
2332                 goto out_free_sym_list;
2333
2334         /*
2335          * A path to symbols of "/" is identical to ""
2336          * reset here for simplicity.
2337          */
2338         symfs = realpath(symbol_conf.symfs, NULL);
2339         if (symfs == NULL)
2340                 symfs = symbol_conf.symfs;
2341         if (strcmp(symfs, "/") == 0)
2342                 symbol_conf.symfs = "";
2343         if (symfs != symbol_conf.symfs)
2344                 free((void *)symfs);
2345
2346         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2347
2348         symbol_conf.initialized = true;
2349         return 0;
2350
2351 out_free_sym_list:
2352         strlist__delete(symbol_conf.sym_list);
2353 out_free_tid_list:
2354         intlist__delete(symbol_conf.tid_list);
2355 out_free_pid_list:
2356         intlist__delete(symbol_conf.pid_list);
2357 out_free_comm_list:
2358         strlist__delete(symbol_conf.comm_list);
2359 out_free_dso_list:
2360         strlist__delete(symbol_conf.dso_list);
2361         return -1;
2362 }
2363
2364 void symbol__exit(void)
2365 {
2366         if (!symbol_conf.initialized)
2367                 return;
2368         strlist__delete(symbol_conf.bt_stop_list);
2369         strlist__delete(symbol_conf.sym_list);
2370         strlist__delete(symbol_conf.dso_list);
2371         strlist__delete(symbol_conf.comm_list);
2372         intlist__delete(symbol_conf.tid_list);
2373         intlist__delete(symbol_conf.pid_list);
2374         vmlinux_path__exit();
2375         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2376         symbol_conf.bt_stop_list = NULL;
2377         symbol_conf.initialized = false;
2378 }
2379
2380 int symbol__config_symfs(const struct option *opt __maybe_unused,
2381                          const char *dir, int unset __maybe_unused)
2382 {
2383         char *bf = NULL;
2384         int ret;
2385
2386         symbol_conf.symfs = strdup(dir);
2387         if (symbol_conf.symfs == NULL)
2388                 return -ENOMEM;
2389
2390         /* skip the locally configured cache if a symfs is given, and
2391          * config buildid dir to symfs/.debug
2392          */
2393         ret = asprintf(&bf, "%s/%s", dir, ".debug");
2394         if (ret < 0)
2395                 return -ENOMEM;
2396
2397         set_buildid_dir(bf);
2398
2399         free(bf);
2400         return 0;
2401 }
2402
2403 struct mem_info *mem_info__get(struct mem_info *mi)
2404 {
2405         if (mi)
2406                 refcount_inc(&mi->refcnt);
2407         return mi;
2408 }
2409
2410 void mem_info__put(struct mem_info *mi)
2411 {
2412         if (mi && refcount_dec_and_test(&mi->refcnt))
2413                 free(mi);
2414 }
2415
2416 struct mem_info *mem_info__new(void)
2417 {
2418         struct mem_info *mi = zalloc(sizeof(*mi));
2419
2420         if (mi)
2421                 refcount_set(&mi->refcnt, 1);
2422         return mi;
2423 }