tools/perf/util/symbol.c

   1 #include <dirent.h>
   2 #include <errno.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <sys/param.h>
   9 #include <fcntl.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12 #include "build-id.h"
  13 #include "util.h"
  14 #include "debug.h"
  15 #include "machine.h"
  16 #include "symbol.h"
  17 #include "strlist.h"
  18 #include "header.h"
  19
  20 #include <elf.h>
  21 #include <limits.h>
  22 #include <symbol/kallsyms.h>
  23 #include <sys/utsname.h>
  24
  25 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
  26                                 symbol_filter_t filter);
  27 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
  28                         symbol_filter_t filter);
  29 int vmlinux_path__nr_entries;
  30 char **vmlinux_path;
  31
  32 struct symbol_conf symbol_conf = {
  33         .use_modules            = true,
  34         .try_vmlinux_path       = true,
  35         .annotate_src           = true,
  36         .demangle               = true,
  37         .demangle_kernel        = false,
  38         .cumulate_callchain     = true,
  39         .show_hist_headers      = true,
  40         .symfs                  = "",
  41 };
  42
  43 static enum dso_binary_type binary_type_symtab[] = {
  44         DSO_BINARY_TYPE__KALLSYMS,
  45         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  46         DSO_BINARY_TYPE__JAVA_JIT,
  47         DSO_BINARY_TYPE__DEBUGLINK,
  48         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  49         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  50         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  51         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  52         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  53         DSO_BINARY_TYPE__GUEST_KMODULE,
  54         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  55         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  56         DSO_BINARY_TYPE__NOT_FOUND,
  57 };
  58
  59 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  60
  61 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  62 {
  63         symbol_type = toupper(symbol_type);
  64
  65         switch (map_type) {
  66         case MAP__FUNCTION:
  67                 return symbol_type == 'T' || symbol_type == 'W';
  68         case MAP__VARIABLE:
  69                 return symbol_type == 'D';
  70         default:
  71                 return false;
  72         }
  73 }
  74
  75 static int prefix_underscores_count(const char *str)
  76 {
  77         const char *tail = str;
  78
  79         while (*tail == '_')
  80                 tail++;
  81
  82         return tail - str;
  83 }
  84
  85 #define SYMBOL_A 0
  86 #define SYMBOL_B 1
  87
  88 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
  89 {
  90         s64 a;
  91         s64 b;
  92         size_t na, nb;
  93
  94         /* Prefer a symbol with non zero length */
  95         a = syma->end - syma->start;
  96         b = symb->end - symb->start;
  97         if ((b == 0) && (a > 0))
  98                 return SYMBOL_A;
  99         else if ((a == 0) && (b > 0))
 100                 return SYMBOL_B;
 101
 102         /* Prefer a non weak symbol over a weak one */
 103         a = syma->binding == STB_WEAK;
 104         b = symb->binding == STB_WEAK;
 105         if (b && !a)
 106                 return SYMBOL_A;
 107         if (a && !b)
 108                 return SYMBOL_B;
 109
 110         /* Prefer a global symbol over a non global one */
 111         a = syma->binding == STB_GLOBAL;
 112         b = symb->binding == STB_GLOBAL;
 113         if (a && !b)
 114                 return SYMBOL_A;
 115         if (b && !a)
 116                 return SYMBOL_B;
 117
 118         /* Prefer a symbol with less underscores */
 119         a = prefix_underscores_count(syma->name);
 120         b = prefix_underscores_count(symb->name);
 121         if (b > a)
 122                 return SYMBOL_A;
 123         else if (a > b)
 124                 return SYMBOL_B;
 125
 126         /* Choose the symbol with the longest name */
 127         na = strlen(syma->name);
 128         nb = strlen(symb->name);
 129         if (na > nb)
 130                 return SYMBOL_A;
 131         else if (na < nb)
 132                 return SYMBOL_B;
 133
 134         /* Avoid "SyS" kernel syscall aliases */
 135         if (na >= 3 && !strncmp(syma->name, "SyS", 3))
 136                 return SYMBOL_B;
 137         if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 138                 return SYMBOL_B;
 139
 140         return SYMBOL_A;
 141 }
 142
 143 void symbols__fixup_duplicate(struct rb_root *symbols)
 144 {
 145         struct rb_node *nd;
 146         struct symbol *curr, *next;
 147
 148         nd = rb_first(symbols);
 149
 150         while (nd) {
 151                 curr = rb_entry(nd, struct symbol, rb_node);
 152 again:
 153                 nd = rb_next(&curr->rb_node);
 154                 next = rb_entry(nd, struct symbol, rb_node);
 155
 156                 if (!nd)
 157                         break;
 158
 159                 if (curr->start != next->start)
 160                         continue;
 161
 162                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 163                         rb_erase(&next->rb_node, symbols);
 164                         symbol__delete(next);
 165                         goto again;
 166                 } else {
 167                         nd = rb_next(&curr->rb_node);
 168                         rb_erase(&curr->rb_node, symbols);
 169                         symbol__delete(curr);
 170                 }
 171         }
 172 }
 173
 174 void symbols__fixup_end(struct rb_root *symbols)
 175 {
 176         struct rb_node *nd, *prevnd = rb_first(symbols);
 177         struct symbol *curr, *prev;
 178
 179         if (prevnd == NULL)
 180                 return;
 181
 182         curr = rb_entry(prevnd, struct symbol, rb_node);
 183
 184         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 185                 prev = curr;
 186                 curr = rb_entry(nd, struct symbol, rb_node);
 187
 188                 if (prev->end == prev->start && prev->end != curr->start)
 189                         prev->end = curr->start - 1;
 190         }
 191
 192         /* Last entry */
 193         if (curr->end == curr->start)
 194                 curr->end = roundup(curr->start, 4096);
 195 }
 196
 197 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 198 {
 199         struct map *prev, *curr;
 200         struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
 201
 202         if (prevnd == NULL)
 203                 return;
 204
 205         curr = rb_entry(prevnd, struct map, rb_node);
 206
 207         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 208                 prev = curr;
 209                 curr = rb_entry(nd, struct map, rb_node);
 210                 prev->end = curr->start - 1;
 211         }
 212
 213         /*
 214          * We still haven't the actual symbols, so guess the
 215          * last map final address.
 216          */
 217         curr->end = ~0ULL;
 218 }
 219
 220 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 221 {
 222         size_t namelen = strlen(name) + 1;
 223         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 224                                         sizeof(*sym) + namelen));
 225         if (sym == NULL)
 226                 return NULL;
 227
 228         if (symbol_conf.priv_size)
 229                 sym = ((void *)sym) + symbol_conf.priv_size;
 230
 231         sym->start   = start;
 232         sym->end     = len ? start + len - 1 : start;
 233         sym->binding = binding;
 234         sym->namelen = namelen - 1;
 235
 236         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 237                   __func__, name, start, sym->end);
 238         memcpy(sym->name, name, namelen);
 239
 240         return sym;
 241 }
 242
 243 void symbol__delete(struct symbol *sym)
 244 {
 245         free(((void *)sym) - symbol_conf.priv_size);
 246 }
 247
 248 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
 249 {
 250         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
 251                        sym->start, sym->end,
 252                        sym->binding == STB_GLOBAL ? 'g' :
 253                        sym->binding == STB_LOCAL  ? 'l' : 'w',
 254                        sym->name);
 255 }
 256
 257 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 258                                     const struct addr_location *al, FILE *fp)
 259 {
 260         unsigned long offset;
 261         size_t length;
 262
 263         if (sym && sym->name) {
 264                 length = fprintf(fp, "%s", sym->name);
 265                 if (al) {
 266                         if (al->addr < sym->end)
 267                                 offset = al->addr - sym->start;
 268                         else
 269                                 offset = al->addr - al->map->start - sym->start;
 270                         length += fprintf(fp, "+0x%lx", offset);
 271                 }
 272                 return length;
 273         } else
 274                 return fprintf(fp, "[unknown]");
 275 }
 276
 277 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
 278 {
 279         return symbol__fprintf_symname_offs(sym, NULL, fp);
 280 }
 281
 282 void symbols__delete(struct rb_root *symbols)
 283 {
 284         struct symbol *pos;
 285         struct rb_node *next = rb_first(symbols);
 286
 287         while (next) {
 288                 pos = rb_entry(next, struct symbol, rb_node);
 289                 next = rb_next(&pos->rb_node);
 290                 rb_erase(&pos->rb_node, symbols);
 291                 symbol__delete(pos);
 292         }
 293 }
 294
 295 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 296 {
 297         struct rb_node **p = &symbols->rb_node;
 298         struct rb_node *parent = NULL;
 299         const u64 ip = sym->start;
 300         struct symbol *s;
 301
 302         while (*p != NULL) {
 303                 parent = *p;
 304                 s = rb_entry(parent, struct symbol, rb_node);
 305                 if (ip < s->start)
 306                         p = &(*p)->rb_left;
 307                 else
 308                         p = &(*p)->rb_right;
 309         }
 310         rb_link_node(&sym->rb_node, parent, p);
 311         rb_insert_color(&sym->rb_node, symbols);
 312 }
 313
 314 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
 315 {
 316         struct rb_node *n;
 317
 318         if (symbols == NULL)
 319                 return NULL;
 320
 321         n = symbols->rb_node;
 322
 323         while (n) {
 324                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 325
 326                 if (ip < s->start)
 327                         n = n->rb_left;
 328                 else if (ip > s->end)
 329                         n = n->rb_right;
 330                 else
 331                         return s;
 332         }
 333
 334         return NULL;
 335 }
 336
 337 static struct symbol *symbols__first(struct rb_root *symbols)
 338 {
 339         struct rb_node *n = rb_first(symbols);
 340
 341         if (n)
 342                 return rb_entry(n, struct symbol, rb_node);
 343
 344         return NULL;
 345 }
 346
 347 static struct symbol *symbols__next(struct symbol *sym)
 348 {
 349         struct rb_node *n = rb_next(&sym->rb_node);
 350
 351         if (n)
 352                 return rb_entry(n, struct symbol, rb_node);
 353
 354         return NULL;
 355 }
 356
 357 struct symbol_name_rb_node {
 358         struct rb_node  rb_node;
 359         struct symbol   sym;
 360 };
 361
 362 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
 363 {
 364         struct rb_node **p = &symbols->rb_node;
 365         struct rb_node *parent = NULL;
 366         struct symbol_name_rb_node *symn, *s;
 367
 368         symn = container_of(sym, struct symbol_name_rb_node, sym);
 369
 370         while (*p != NULL) {
 371                 parent = *p;
 372                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 373                 if (strcmp(sym->name, s->sym.name) < 0)
 374                         p = &(*p)->rb_left;
 375                 else
 376                         p = &(*p)->rb_right;
 377         }
 378         rb_link_node(&symn->rb_node, parent, p);
 379         rb_insert_color(&symn->rb_node, symbols);
 380 }
 381
 382 static void symbols__sort_by_name(struct rb_root *symbols,
 383                                   struct rb_root *source)
 384 {
 385         struct rb_node *nd;
 386
 387         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 388                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 389                 symbols__insert_by_name(symbols, pos);
 390         }
 391 }
 392
 393 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
 394                                             const char *name)
 395 {
 396         struct rb_node *n;
 397
 398         if (symbols == NULL)
 399                 return NULL;
 400
 401         n = symbols->rb_node;
 402
 403         while (n) {
 404                 struct symbol_name_rb_node *s;
 405                 int cmp;
 406
 407                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 408                 cmp = strcmp(name, s->sym.name);
 409
 410                 if (cmp < 0)
 411                         n = n->rb_left;
 412                 else if (cmp > 0)
 413                         n = n->rb_right;
 414                 else
 415                         return &s->sym;
 416         }
 417
 418         return NULL;
 419 }
 420
 421 struct symbol *dso__find_symbol(struct dso *dso,
 422                                 enum map_type type, u64 addr)
 423 {
 424         return symbols__find(&dso->symbols[type], addr);
 425 }
 426
 427 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 428 {
 429         return symbols__first(&dso->symbols[type]);
 430 }
 431
 432 struct symbol *dso__next_symbol(struct symbol *sym)
 433 {
 434         return symbols__next(sym);
 435 }
 436
 437 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 438                                         const char *name)
 439 {
 440         return symbols__find_by_name(&dso->symbol_names[type], name);
 441 }
 442
 443 void dso__sort_by_name(struct dso *dso, enum map_type type)
 444 {
 445         dso__set_sorted_by_name(dso, type);
 446         return symbols__sort_by_name(&dso->symbol_names[type],
 447                                      &dso->symbols[type]);
 448 }
 449
 450 size_t dso__fprintf_symbols_by_name(struct dso *dso,
 451                                     enum map_type type, FILE *fp)
 452 {
 453         size_t ret = 0;
 454         struct rb_node *nd;
 455         struct symbol_name_rb_node *pos;
 456
 457         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
 458                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 459                 fprintf(fp, "%s\n", pos->sym.name);
 460         }
 461
 462         return ret;
 463 }
 464
 465 int modules__parse(const char *filename, void *arg,
 466                    int (*process_module)(void *arg, const char *name,
 467                                          u64 start))
 468 {
 469         char *line = NULL;
 470         size_t n;
 471         FILE *file;
 472         int err = 0;
 473
 474         file = fopen(filename, "r");
 475         if (file == NULL)
 476                 return -1;
 477
 478         while (1) {
 479                 char name[PATH_MAX];
 480                 u64 start;
 481                 char *sep;
 482                 ssize_t line_len;
 483
 484                 line_len = getline(&line, &n, file);
 485                 if (line_len < 0) {
 486                         if (feof(file))
 487                                 break;
 488                         err = -1;
 489                         goto out;
 490                 }
 491
 492                 if (!line) {
 493                         err = -1;
 494                         goto out;
 495                 }
 496
 497                 line[--line_len] = '\0'; /* \n */
 498
 499                 sep = strrchr(line, 'x');
 500                 if (sep == NULL)
 501                         continue;
 502
 503                 hex2u64(sep + 1, &start);
 504
 505                 sep = strchr(line, ' ');
 506                 if (sep == NULL)
 507                         continue;
 508
 509                 *sep = '\0';
 510
 511                 scnprintf(name, sizeof(name), "[%s]", line);
 512
 513                 err = process_module(arg, name, start);
 514                 if (err)
 515                         break;
 516         }
 517 out:
 518         free(line);
 519         fclose(file);
 520         return err;
 521 }
 522
 523 struct process_kallsyms_args {
 524         struct map *map;
 525         struct dso *dso;
 526 };
 527
 528 /*
 529  * These are symbols in the kernel image, so make sure that
 530  * sym is from a kernel DSO.
 531  */
 532 bool symbol__is_idle(struct symbol *sym)
 533 {
 534         const char * const idle_symbols[] = {
 535                 "cpu_idle",
 536                 "cpu_startup_entry",
 537                 "intel_idle",
 538                 "default_idle",
 539                 "native_safe_halt",
 540                 "enter_idle",
 541                 "exit_idle",
 542                 "mwait_idle",
 543                 "mwait_idle_with_hints",
 544                 "poll_idle",
 545                 "ppc64_runlatch_off",
 546                 "pseries_dedicated_idle_sleep",
 547                 NULL
 548         };
 549
 550         int i;
 551
 552         if (!sym)
 553                 return false;
 554
 555         for (i = 0; idle_symbols[i]; i++) {
 556                 if (!strcmp(idle_symbols[i], sym->name))
 557                         return true;
 558         }
 559
 560         return false;
 561 }
 562
 563 static int map__process_kallsym_symbol(void *arg, const char *name,
 564                                        char type, u64 start)
 565 {
 566         struct symbol *sym;
 567         struct process_kallsyms_args *a = arg;
 568         struct rb_root *root = &a->dso->symbols[a->map->type];
 569
 570         if (!symbol_type__is_a(type, a->map->type))
 571                 return 0;
 572
 573         /*
 574          * module symbols are not sorted so we add all
 575          * symbols, setting length to 0, and rely on
 576          * symbols__fixup_end() to fix it up.
 577          */
 578         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
 579         if (sym == NULL)
 580                 return -ENOMEM;
 581         /*
 582          * We will pass the symbols to the filter later, in
 583          * map__split_kallsyms, when we have split the maps per module
 584          */
 585         symbols__insert(root, sym);
 586
 587         return 0;
 588 }
 589
 590 /*
 591  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 592  * so that we can in the next step set the symbol ->end address and then
 593  * call kernel_maps__split_kallsyms.
 594  */
 595 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 596                                   struct map *map)
 597 {
 598         struct process_kallsyms_args args = { .map = map, .dso = dso, };
 599         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 600 }
 601
 602 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
 603                                          symbol_filter_t filter)
 604 {
 605         struct map_groups *kmaps = map__kmap(map)->kmaps;
 606         struct map *curr_map;
 607         struct symbol *pos;
 608         int count = 0, moved = 0;
 609         struct rb_root *root = &dso->symbols[map->type];
 610         struct rb_node *next = rb_first(root);
 611
 612         while (next) {
 613                 char *module;
 614
 615                 pos = rb_entry(next, struct symbol, rb_node);
 616                 next = rb_next(&pos->rb_node);
 617
 618                 module = strchr(pos->name, '\t');
 619                 if (module)
 620                         *module = '\0';
 621
 622                 curr_map = map_groups__find(kmaps, map->type, pos->start);
 623
 624                 if (!curr_map || (filter && filter(curr_map, pos))) {
 625                         rb_erase(&pos->rb_node, root);
 626                         symbol__delete(pos);
 627                 } else {
 628                         pos->start -= curr_map->start - curr_map->pgoff;
 629                         if (pos->end)
 630                                 pos->end -= curr_map->start - curr_map->pgoff;
 631                         if (curr_map != map) {
 632                                 rb_erase(&pos->rb_node, root);
 633                                 symbols__insert(
 634                                         &curr_map->dso->symbols[curr_map->type],
 635                                         pos);
 636                                 ++moved;
 637                         } else {
 638                                 ++count;
 639                         }
 640                 }
 641         }
 642
 643         /* Symbols have been adjusted */
 644         dso->adjust_symbols = 1;
 645
 646         return count + moved;
 647 }
 648
 649 /*
 650  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 651  * kernel range is broken in several maps, named [kernel].N, as we don't have
 652  * the original ELF section names vmlinux have.
 653  */
 654 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
 655                                symbol_filter_t filter)
 656 {
 657         struct map_groups *kmaps = map__kmap(map)->kmaps;
 658         struct machine *machine = kmaps->machine;
 659         struct map *curr_map = map;
 660         struct symbol *pos;
 661         int count = 0, moved = 0;
 662         struct rb_root *root = &dso->symbols[map->type];
 663         struct rb_node *next = rb_first(root);
 664         int kernel_range = 0;
 665
 666         while (next) {
 667                 char *module;
 668
 669                 pos = rb_entry(next, struct symbol, rb_node);
 670                 next = rb_next(&pos->rb_node);
 671
 672                 module = strchr(pos->name, '\t');
 673                 if (module) {
 674                         if (!symbol_conf.use_modules)
 675                                 goto discard_symbol;
 676
 677                         *module++ = '\0';
 678
 679                         if (strcmp(curr_map->dso->short_name, module)) {
 680                                 if (curr_map != map &&
 681                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 682                                     machine__is_default_guest(machine)) {
 683                                         /*
 684                                          * We assume all symbols of a module are
 685                                          * continuous in * kallsyms, so curr_map
 686                                          * points to a module and all its
 687                                          * symbols are in its kmap. Mark it as
 688                                          * loaded.
 689                                          */
 690                                         dso__set_loaded(curr_map->dso,
 691                                                         curr_map->type);
 692                                 }
 693
 694                                 curr_map = map_groups__find_by_name(kmaps,
 695                                                         map->type, module);
 696                                 if (curr_map == NULL) {
 697                                         pr_debug("%s/proc/{kallsyms,modules} "
 698                                                  "inconsistency while looking "
 699                                                  "for \"%s\" module!\n",
 700                                                  machine->root_dir, module);
 701                                         curr_map = map;
 702                                         goto discard_symbol;
 703                                 }
 704
 705                                 if (curr_map->dso->loaded &&
 706                                     !machine__is_default_guest(machine))
 707                                         goto discard_symbol;
 708                         }
 709                         /*
 710                          * So that we look just like we get from .ko files,
 711                          * i.e. not prelinked, relative to map->start.
 712                          */
 713                         pos->start = curr_map->map_ip(curr_map, pos->start);
 714                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 715                 } else if (curr_map != map) {
 716                         char dso_name[PATH_MAX];
 717                         struct dso *ndso;
 718
 719                         if (delta) {
 720                                 /* Kernel was relocated at boot time */
 721                                 pos->start -= delta;
 722                                 pos->end -= delta;
 723                         }
 724
 725                         if (count == 0) {
 726                                 curr_map = map;
 727                                 goto filter_symbol;
 728                         }
 729
 730                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 731                                 snprintf(dso_name, sizeof(dso_name),
 732                                         "[guest.kernel].%d",
 733                                         kernel_range++);
 734                         else
 735                                 snprintf(dso_name, sizeof(dso_name),
 736                                         "[kernel].%d",
 737                                         kernel_range++);
 738
 739                         ndso = dso__new(dso_name);
 740                         if (ndso == NULL)
 741                                 return -1;
 742
 743                         ndso->kernel = dso->kernel;
 744
 745                         curr_map = map__new2(pos->start, ndso, map->type);
 746                         if (curr_map == NULL) {
 747                                 dso__delete(ndso);
 748                                 return -1;
 749                         }
 750
 751                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 752                         map_groups__insert(kmaps, curr_map);
 753                         ++kernel_range;
 754                 } else if (delta) {
 755                         /* Kernel was relocated at boot time */
 756                         pos->start -= delta;
 757                         pos->end -= delta;
 758                 }
 759 filter_symbol:
 760                 if (filter && filter(curr_map, pos)) {
 761 discard_symbol:         rb_erase(&pos->rb_node, root);
 762                         symbol__delete(pos);
 763                 } else {
 764                         if (curr_map != map) {
 765                                 rb_erase(&pos->rb_node, root);
 766                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 767                                 ++moved;
 768                         } else
 769                                 ++count;
 770                 }
 771         }
 772
 773         if (curr_map != map &&
 774             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 775             machine__is_default_guest(kmaps->machine)) {
 776                 dso__set_loaded(curr_map->dso, curr_map->type);
 777         }
 778
 779         return count + moved;
 780 }
 781
 782 bool symbol__restricted_filename(const char *filename,
 783                                  const char *restricted_filename)
 784 {
 785         bool restricted = false;
 786
 787         if (symbol_conf.kptr_restrict) {
 788                 char *r = realpath(filename, NULL);
 789
 790                 if (r != NULL) {
 791                         restricted = strcmp(r, restricted_filename) == 0;
 792                         free(r);
 793                         return restricted;
 794                 }
 795         }
 796
 797         return restricted;
 798 }
 799
 800 struct module_info {
 801         struct rb_node rb_node;
 802         char *name;
 803         u64 start;
 804 };
 805
 806 static void add_module(struct module_info *mi, struct rb_root *modules)
 807 {
 808         struct rb_node **p = &modules->rb_node;
 809         struct rb_node *parent = NULL;
 810         struct module_info *m;
 811
 812         while (*p != NULL) {
 813                 parent = *p;
 814                 m = rb_entry(parent, struct module_info, rb_node);
 815                 if (strcmp(mi->name, m->name) < 0)
 816                         p = &(*p)->rb_left;
 817                 else
 818                         p = &(*p)->rb_right;
 819         }
 820         rb_link_node(&mi->rb_node, parent, p);
 821         rb_insert_color(&mi->rb_node, modules);
 822 }
 823
 824 static void delete_modules(struct rb_root *modules)
 825 {
 826         struct module_info *mi;
 827         struct rb_node *next = rb_first(modules);
 828
 829         while (next) {
 830                 mi = rb_entry(next, struct module_info, rb_node);
 831                 next = rb_next(&mi->rb_node);
 832                 rb_erase(&mi->rb_node, modules);
 833                 zfree(&mi->name);
 834                 free(mi);
 835         }
 836 }
 837
 838 static struct module_info *find_module(const char *name,
 839                                        struct rb_root *modules)
 840 {
 841         struct rb_node *n = modules->rb_node;
 842
 843         while (n) {
 844                 struct module_info *m;
 845                 int cmp;
 846
 847                 m = rb_entry(n, struct module_info, rb_node);
 848                 cmp = strcmp(name, m->name);
 849                 if (cmp < 0)
 850                         n = n->rb_left;
 851                 else if (cmp > 0)
 852                         n = n->rb_right;
 853                 else
 854                         return m;
 855         }
 856
 857         return NULL;
 858 }
 859
 860 static int __read_proc_modules(void *arg, const char *name, u64 start)
 861 {
 862         struct rb_root *modules = arg;
 863         struct module_info *mi;
 864
 865         mi = zalloc(sizeof(struct module_info));
 866         if (!mi)
 867                 return -ENOMEM;
 868
 869         mi->name = strdup(name);
 870         mi->start = start;
 871
 872         if (!mi->name) {
 873                 free(mi);
 874                 return -ENOMEM;
 875         }
 876
 877         add_module(mi, modules);
 878
 879         return 0;
 880 }
 881
 882 static int read_proc_modules(const char *filename, struct rb_root *modules)
 883 {
 884         if (symbol__restricted_filename(filename, "/proc/modules"))
 885                 return -1;
 886
 887         if (modules__parse(filename, modules, __read_proc_modules)) {
 888                 delete_modules(modules);
 889                 return -1;
 890         }
 891
 892         return 0;
 893 }
 894
 895 int compare_proc_modules(const char *from, const char *to)
 896 {
 897         struct rb_root from_modules = RB_ROOT;
 898         struct rb_root to_modules = RB_ROOT;
 899         struct rb_node *from_node, *to_node;
 900         struct module_info *from_m, *to_m;
 901         int ret = -1;
 902
 903         if (read_proc_modules(from, &from_modules))
 904                 return -1;
 905
 906         if (read_proc_modules(to, &to_modules))
 907                 goto out_delete_from;
 908
 909         from_node = rb_first(&from_modules);
 910         to_node = rb_first(&to_modules);
 911         while (from_node) {
 912                 if (!to_node)
 913                         break;
 914
 915                 from_m = rb_entry(from_node, struct module_info, rb_node);
 916                 to_m = rb_entry(to_node, struct module_info, rb_node);
 917
 918                 if (from_m->start != to_m->start ||
 919                     strcmp(from_m->name, to_m->name))
 920                         break;
 921
 922                 from_node = rb_next(from_node);
 923                 to_node = rb_next(to_node);
 924         }
 925
 926         if (!from_node && !to_node)
 927                 ret = 0;
 928
 929         delete_modules(&to_modules);
 930 out_delete_from:
 931         delete_modules(&from_modules);
 932
 933         return ret;
 934 }
 935
 936 static int do_validate_kcore_modules(const char *filename, struct map *map,
 937                                   struct map_groups *kmaps)
 938 {
 939         struct rb_root modules = RB_ROOT;
 940         struct map *old_map;
 941         int err;
 942
 943         err = read_proc_modules(filename, &modules);
 944         if (err)
 945                 return err;
 946
 947         old_map = map_groups__first(kmaps, map->type);
 948         while (old_map) {
 949                 struct map *next = map_groups__next(old_map);
 950                 struct module_info *mi;
 951
 952                 if (old_map == map || old_map->start == map->start) {
 953                         /* The kernel map */
 954                         old_map = next;
 955                         continue;
 956                 }
 957
 958                 /* Module must be in memory at the same address */
 959                 mi = find_module(old_map->dso->short_name, &modules);
 960                 if (!mi || mi->start != old_map->start) {
 961                         err = -EINVAL;
 962                         goto out;
 963                 }
 964
 965                 old_map = next;
 966         }
 967 out:
 968         delete_modules(&modules);
 969         return err;
 970 }
 971
 972 /*
 973  * If kallsyms is referenced by name then we look for filename in the same
 974  * directory.
 975  */
 976 static bool filename_from_kallsyms_filename(char *filename,
 977                                             const char *base_name,
 978                                             const char *kallsyms_filename)
 979 {
 980         char *name;
 981
 982         strcpy(filename, kallsyms_filename);
 983         name = strrchr(filename, '/');
 984         if (!name)
 985                 return false;
 986
 987         name += 1;
 988
 989         if (!strcmp(name, "kallsyms")) {
 990                 strcpy(name, base_name);
 991                 return true;
 992         }
 993
 994         return false;
 995 }
 996
 997 static int validate_kcore_modules(const char *kallsyms_filename,
 998                                   struct map *map)
 999 {
1000         struct map_groups *kmaps = map__kmap(map)->kmaps;
1001         char modules_filename[PATH_MAX];
1002
1003         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1004                                              kallsyms_filename))
1005                 return -EINVAL;
1006
1007         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1008                 return -EINVAL;
1009
1010         return 0;
1011 }
1012
1013 static int validate_kcore_addresses(const char *kallsyms_filename,
1014                                     struct map *map)
1015 {
1016         struct kmap *kmap = map__kmap(map);
1017
1018         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1019                 u64 start;
1020
1021                 start = kallsyms__get_function_start(kallsyms_filename,
1022                                                      kmap->ref_reloc_sym->name);
1023                 if (start != kmap->ref_reloc_sym->addr)
1024                         return -EINVAL;
1025         }
1026
1027         return validate_kcore_modules(kallsyms_filename, map);
1028 }
1029
1030 struct kcore_mapfn_data {
1031         struct dso *dso;
1032         enum map_type type;
1033         struct list_head maps;
1034 };
1035
1036 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1037 {
1038         struct kcore_mapfn_data *md = data;
1039         struct map *map;
1040
1041         map = map__new2(start, md->dso, md->type);
1042         if (map == NULL)
1043                 return -ENOMEM;
1044
1045         map->end = map->start + len;
1046         map->pgoff = pgoff;
1047
1048         list_add(&map->node, &md->maps);
1049
1050         return 0;
1051 }
1052
1053 static int dso__load_kcore(struct dso *dso, struct map *map,
1054                            const char *kallsyms_filename)
1055 {
1056         struct map_groups *kmaps = map__kmap(map)->kmaps;
1057         struct machine *machine = kmaps->machine;
1058         struct kcore_mapfn_data md;
1059         struct map *old_map, *new_map, *replacement_map = NULL;
1060         bool is_64_bit;
1061         int err, fd;
1062         char kcore_filename[PATH_MAX];
1063         struct symbol *sym;
1064
1065         /* This function requires that the map is the kernel map */
1066         if (map != machine->vmlinux_maps[map->type])
1067                 return -EINVAL;
1068
1069         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1070                                              kallsyms_filename))
1071                 return -EINVAL;
1072
1073         /* Modules and kernel must be present at their original addresses */
1074         if (validate_kcore_addresses(kallsyms_filename, map))
1075                 return -EINVAL;
1076
1077         md.dso = dso;
1078         md.type = map->type;
1079         INIT_LIST_HEAD(&md.maps);
1080
1081         fd = open(kcore_filename, O_RDONLY);
1082         if (fd < 0)
1083                 return -EINVAL;
1084
1085         /* Read new maps into temporary lists */
1086         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1087                               &is_64_bit);
1088         if (err)
1089                 goto out_err;
1090         dso->is_64_bit = is_64_bit;
1091
1092         if (list_empty(&md.maps)) {
1093                 err = -EINVAL;
1094                 goto out_err;
1095         }
1096
1097         /* Remove old maps */
1098         old_map = map_groups__first(kmaps, map->type);
1099         while (old_map) {
1100                 struct map *next = map_groups__next(old_map);
1101
1102                 if (old_map != map)
1103                         map_groups__remove(kmaps, old_map);
1104                 old_map = next;
1105         }
1106
1107         /* Find the kernel map using the first symbol */
1108         sym = dso__first_symbol(dso, map->type);
1109         list_for_each_entry(new_map, &md.maps, node) {
1110                 if (sym && sym->start >= new_map->start &&
1111                     sym->start < new_map->end) {
1112                         replacement_map = new_map;
1113                         break;
1114                 }
1115         }
1116
1117         if (!replacement_map)
1118                 replacement_map = list_entry(md.maps.next, struct map, node);
1119
1120         /* Add new maps */
1121         while (!list_empty(&md.maps)) {
1122                 new_map = list_entry(md.maps.next, struct map, node);
1123                 list_del(&new_map->node);
1124                 if (new_map == replacement_map) {
1125                         map->start      = new_map->start;
1126                         map->end        = new_map->end;
1127                         map->pgoff      = new_map->pgoff;
1128                         map->map_ip     = new_map->map_ip;
1129                         map->unmap_ip   = new_map->unmap_ip;
1130                         map__delete(new_map);
1131                         /* Ensure maps are correctly ordered */
1132                         map_groups__remove(kmaps, map);
1133                         map_groups__insert(kmaps, map);
1134                 } else {
1135                         map_groups__insert(kmaps, new_map);
1136                 }
1137         }
1138
1139         /*
1140          * Set the data type and long name so that kcore can be read via
1141          * dso__data_read_addr().
1142          */
1143         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1144                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1145         else
1146                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1147         dso__set_long_name(dso, strdup(kcore_filename), true);
1148
1149         close(fd);
1150
1151         if (map->type == MAP__FUNCTION)
1152                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1153         else
1154                 pr_debug("Using %s for kernel data\n", kcore_filename);
1155
1156         return 0;
1157
1158 out_err:
1159         while (!list_empty(&md.maps)) {
1160                 map = list_entry(md.maps.next, struct map, node);
1161                 list_del(&map->node);
1162                 map__delete(map);
1163         }
1164         close(fd);
1165         return -EINVAL;
1166 }
1167
1168 /*
1169  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1170  * delta based on the relocation reference symbol.
1171  */
1172 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1173 {
1174         struct kmap *kmap = map__kmap(map);
1175         u64 addr;
1176
1177         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1178                 return 0;
1179
1180         addr = kallsyms__get_function_start(filename,
1181                                             kmap->ref_reloc_sym->name);
1182         if (!addr)
1183                 return -1;
1184
1185         *delta = addr - kmap->ref_reloc_sym->addr;
1186         return 0;
1187 }
1188
1189 int dso__load_kallsyms(struct dso *dso, const char *filename,
1190                        struct map *map, symbol_filter_t filter)
1191 {
1192         u64 delta = 0;
1193
1194         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1195                 return -1;
1196
1197         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1198                 return -1;
1199
1200         if (kallsyms__delta(map, filename, &delta))
1201                 return -1;
1202
1203         symbols__fixup_duplicate(&dso->symbols[map->type]);
1204         symbols__fixup_end(&dso->symbols[map->type]);
1205
1206         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1207                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1208         else
1209                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1210
1211         if (!dso__load_kcore(dso, map, filename))
1212                 return dso__split_kallsyms_for_kcore(dso, map, filter);
1213         else
1214                 return dso__split_kallsyms(dso, map, delta, filter);
1215 }
1216
1217 static int dso__load_perf_map(struct dso *dso, struct map *map,
1218                               symbol_filter_t filter)
1219 {
1220         char *line = NULL;
1221         size_t n;
1222         FILE *file;
1223         int nr_syms = 0;
1224
1225         file = fopen(dso->long_name, "r");
1226         if (file == NULL)
1227                 goto out_failure;
1228
1229         while (!feof(file)) {
1230                 u64 start, size;
1231                 struct symbol *sym;
1232                 int line_len, len;
1233
1234                 line_len = getline(&line, &n, file);
1235                 if (line_len < 0)
1236                         break;
1237
1238                 if (!line)
1239                         goto out_failure;
1240
1241                 line[--line_len] = '\0'; /* \n */
1242
1243                 len = hex2u64(line, &start);
1244
1245                 len++;
1246                 if (len + 2 >= line_len)
1247                         continue;
1248
1249                 len += hex2u64(line + len, &size);
1250
1251                 len++;
1252                 if (len + 2 >= line_len)
1253                         continue;
1254
1255                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1256
1257                 if (sym == NULL)
1258                         goto out_delete_line;
1259
1260                 if (filter && filter(map, sym))
1261                         symbol__delete(sym);
1262                 else {
1263                         symbols__insert(&dso->symbols[map->type], sym);
1264                         nr_syms++;
1265                 }
1266         }
1267
1268         free(line);
1269         fclose(file);
1270
1271         return nr_syms;
1272
1273 out_delete_line:
1274         free(line);
1275 out_failure:
1276         return -1;
1277 }
1278
1279 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1280                                            enum dso_binary_type type)
1281 {
1282         switch (type) {
1283         case DSO_BINARY_TYPE__JAVA_JIT:
1284         case DSO_BINARY_TYPE__DEBUGLINK:
1285         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1286         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1287         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1288         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1289         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1290                 return !kmod && dso->kernel == DSO_TYPE_USER;
1291
1292         case DSO_BINARY_TYPE__KALLSYMS:
1293         case DSO_BINARY_TYPE__VMLINUX:
1294         case DSO_BINARY_TYPE__KCORE:
1295                 return dso->kernel == DSO_TYPE_KERNEL;
1296
1297         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1298         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1299         case DSO_BINARY_TYPE__GUEST_KCORE:
1300                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1301
1302         case DSO_BINARY_TYPE__GUEST_KMODULE:
1303         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1304                 /*
1305                  * kernel modules know their symtab type - it's set when
1306                  * creating a module dso in machine__new_module().
1307                  */
1308                 return kmod && dso->symtab_type == type;
1309
1310         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1311                 return true;
1312
1313         case DSO_BINARY_TYPE__NOT_FOUND:
1314         default:
1315                 return false;
1316         }
1317 }
1318
1319 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1320 {
1321         char *name;
1322         int ret = -1;
1323         u_int i;
1324         struct machine *machine;
1325         char *root_dir = (char *) "";
1326         int ss_pos = 0;
1327         struct symsrc ss_[2];
1328         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1329         bool kmod;
1330
1331         dso__set_loaded(dso, map->type);
1332
1333         if (dso->kernel == DSO_TYPE_KERNEL)
1334                 return dso__load_kernel_sym(dso, map, filter);
1335         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1336                 return dso__load_guest_kernel_sym(dso, map, filter);
1337
1338         if (map->groups && map->groups->machine)
1339                 machine = map->groups->machine;
1340         else
1341                 machine = NULL;
1342
1343         dso->adjust_symbols = 0;
1344
1345         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1346                 struct stat st;
1347
1348                 if (lstat(dso->name, &st) < 0)
1349                         return -1;
1350
1351                 if (st.st_uid && (st.st_uid != geteuid())) {
1352                         pr_warning("File %s not owned by current user or root, "
1353                                 "ignoring it.\n", dso->name);
1354                         return -1;
1355                 }
1356
1357                 ret = dso__load_perf_map(dso, map, filter);
1358                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1359                                              DSO_BINARY_TYPE__NOT_FOUND;
1360                 return ret;
1361         }
1362
1363         if (machine)
1364                 root_dir = machine->root_dir;
1365
1366         name = malloc(PATH_MAX);
1367         if (!name)
1368                 return -1;
1369
1370         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1371                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1372
1373         /*
1374          * Iterate over candidate debug images.
1375          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1376          * and/or opd section) for processing.
1377          */
1378         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1379                 struct symsrc *ss = &ss_[ss_pos];
1380                 bool next_slot = false;
1381
1382                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1383
1384                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1385                         continue;
1386
1387                 if (dso__read_binary_type_filename(dso, symtab_type,
1388                                                    root_dir, name, PATH_MAX))
1389                         continue;
1390
1391                 /* Name is now the name of the next image to try */
1392                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1393                         continue;
1394
1395                 if (!syms_ss && symsrc__has_symtab(ss)) {
1396                         syms_ss = ss;
1397                         next_slot = true;
1398                         if (!dso->symsrc_filename)
1399                                 dso->symsrc_filename = strdup(name);
1400                 }
1401
1402                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1403                         runtime_ss = ss;
1404                         next_slot = true;
1405                 }
1406
1407                 if (next_slot) {
1408                         ss_pos++;
1409
1410                         if (syms_ss && runtime_ss)
1411                                 break;
1412                 } else {
1413                         symsrc__destroy(ss);
1414                 }
1415
1416         }
1417
1418         if (!runtime_ss && !syms_ss)
1419                 goto out_free;
1420
1421         if (runtime_ss && !syms_ss) {
1422                 syms_ss = runtime_ss;
1423         }
1424
1425         /* We'll have to hope for the best */
1426         if (!runtime_ss && syms_ss)
1427                 runtime_ss = syms_ss;
1428
1429         if (syms_ss)
1430                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1431         else
1432                 ret = -1;
1433
1434         if (ret > 0) {
1435                 int nr_plt;
1436
1437                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1438                 if (nr_plt > 0)
1439                         ret += nr_plt;
1440         }
1441
1442         for (; ss_pos > 0; ss_pos--)
1443                 symsrc__destroy(&ss_[ss_pos - 1]);
1444 out_free:
1445         free(name);
1446         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1447                 return 0;
1448         return ret;
1449 }
1450
1451 struct map *map_groups__find_by_name(struct map_groups *mg,
1452                                      enum map_type type, const char *name)
1453 {
1454         struct rb_node *nd;
1455
1456         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1457                 struct map *map = rb_entry(nd, struct map, rb_node);
1458
1459                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1460                         return map;
1461         }
1462
1463         return NULL;
1464 }
1465
1466 int dso__load_vmlinux(struct dso *dso, struct map *map,
1467                       const char *vmlinux, bool vmlinux_allocated,
1468                       symbol_filter_t filter)
1469 {
1470         int err = -1;
1471         struct symsrc ss;
1472         char symfs_vmlinux[PATH_MAX];
1473         enum dso_binary_type symtab_type;
1474
1475         if (vmlinux[0] == '/')
1476                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1477         else
1478                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1479
1480         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1481                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1482         else
1483                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1484
1485         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1486                 return -1;
1487
1488         err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1489         symsrc__destroy(&ss);
1490
1491         if (err > 0) {
1492                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1493                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1494                 else
1495                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1496                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1497                 dso__set_loaded(dso, map->type);
1498                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1499         }
1500
1501         return err;
1502 }
1503
1504 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1505                            symbol_filter_t filter)
1506 {
1507         int i, err = 0;
1508         char *filename;
1509
1510         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1511                  vmlinux_path__nr_entries + 1);
1512
1513         filename = dso__build_id_filename(dso, NULL, 0);
1514         if (filename != NULL) {
1515                 err = dso__load_vmlinux(dso, map, filename, true, filter);
1516                 if (err > 0)
1517                         goto out;
1518                 free(filename);
1519         }
1520
1521         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1522                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1523                 if (err > 0)
1524                         break;
1525         }
1526 out:
1527         return err;
1528 }
1529
1530 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1531 {
1532         char kallsyms_filename[PATH_MAX];
1533         struct dirent *dent;
1534         int ret = -1;
1535         DIR *d;
1536
1537         d = opendir(dir);
1538         if (!d)
1539                 return -1;
1540
1541         while (1) {
1542                 dent = readdir(d);
1543                 if (!dent)
1544                         break;
1545                 if (dent->d_type != DT_DIR)
1546                         continue;
1547                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1548                           "%s/%s/kallsyms", dir, dent->d_name);
1549                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1550                         strlcpy(dir, kallsyms_filename, dir_sz);
1551                         ret = 0;
1552                         break;
1553                 }
1554         }
1555
1556         closedir(d);
1557
1558         return ret;
1559 }
1560
1561 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1562 {
1563         u8 host_build_id[BUILD_ID_SIZE];
1564         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1565         bool is_host = false;
1566         char path[PATH_MAX];
1567
1568         if (!dso->has_build_id) {
1569                 /*
1570                  * Last resort, if we don't have a build-id and couldn't find
1571                  * any vmlinux file, try the running kernel kallsyms table.
1572                  */
1573                 goto proc_kallsyms;
1574         }
1575
1576         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1577                                  sizeof(host_build_id)) == 0)
1578                 is_host = dso__build_id_equal(dso, host_build_id);
1579
1580         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1581
1582         scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1583                   sbuild_id);
1584
1585         /* Use /proc/kallsyms if possible */
1586         if (is_host) {
1587                 DIR *d;
1588                 int fd;
1589
1590                 /* If no cached kcore go with /proc/kallsyms */
1591                 d = opendir(path);
1592                 if (!d)
1593                         goto proc_kallsyms;
1594                 closedir(d);
1595
1596                 /*
1597                  * Do not check the build-id cache, until we know we cannot use
1598                  * /proc/kcore.
1599                  */
1600                 fd = open("/proc/kcore", O_RDONLY);
1601                 if (fd != -1) {
1602                         close(fd);
1603                         /* If module maps match go with /proc/kallsyms */
1604                         if (!validate_kcore_addresses("/proc/kallsyms", map))
1605                                 goto proc_kallsyms;
1606                 }
1607
1608                 /* Find kallsyms in build-id cache with kcore */
1609                 if (!find_matching_kcore(map, path, sizeof(path)))
1610                         return strdup(path);
1611
1612                 goto proc_kallsyms;
1613         }
1614
1615         /* Find kallsyms in build-id cache with kcore */
1616         if (!find_matching_kcore(map, path, sizeof(path)))
1617                 return strdup(path);
1618
1619         scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1620                   buildid_dir, sbuild_id);
1621
1622         if (access(path, F_OK)) {
1623                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1624                        sbuild_id);
1625                 return NULL;
1626         }
1627
1628         return strdup(path);
1629
1630 proc_kallsyms:
1631         return strdup("/proc/kallsyms");
1632 }
1633
1634 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1635                                 symbol_filter_t filter)
1636 {
1637         int err;
1638         const char *kallsyms_filename = NULL;
1639         char *kallsyms_allocated_filename = NULL;
1640         /*
1641          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1642          * it and only it, reporting errors to the user if it cannot be used.
1643          *
1644          * For instance, try to analyse an ARM perf.data file _without_ a
1645          * build-id, or if the user specifies the wrong path to the right
1646          * vmlinux file, obviously we can't fallback to another vmlinux (a
1647          * x86_86 one, on the machine where analysis is being performed, say),
1648          * or worse, /proc/kallsyms.
1649          *
1650          * If the specified file _has_ a build-id and there is a build-id
1651          * section in the perf.data file, we will still do the expected
1652          * validation in dso__load_vmlinux and will bail out if they don't
1653          * match.
1654          */
1655         if (symbol_conf.kallsyms_name != NULL) {
1656                 kallsyms_filename = symbol_conf.kallsyms_name;
1657                 goto do_kallsyms;
1658         }
1659
1660         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1661                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1662                                          false, filter);
1663         }
1664
1665         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1666                 err = dso__load_vmlinux_path(dso, map, filter);
1667                 if (err > 0)
1668                         return err;
1669         }
1670
1671         /* do not try local files if a symfs was given */
1672         if (symbol_conf.symfs[0] != 0)
1673                 return -1;
1674
1675         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1676         if (!kallsyms_allocated_filename)
1677                 return -1;
1678
1679         kallsyms_filename = kallsyms_allocated_filename;
1680
1681 do_kallsyms:
1682         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1683         if (err > 0)
1684                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1685         free(kallsyms_allocated_filename);
1686
1687         if (err > 0 && !dso__is_kcore(dso)) {
1688                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1689                 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1690                 map__fixup_start(map);
1691                 map__fixup_end(map);
1692         }
1693
1694         return err;
1695 }
1696
1697 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1698                                       symbol_filter_t filter)
1699 {
1700         int err;
1701         const char *kallsyms_filename = NULL;
1702         struct machine *machine;
1703         char path[PATH_MAX];
1704
1705         if (!map->groups) {
1706                 pr_debug("Guest kernel map hasn't the point to groups\n");
1707                 return -1;
1708         }
1709         machine = map->groups->machine;
1710
1711         if (machine__is_default_guest(machine)) {
1712                 /*
1713                  * if the user specified a vmlinux filename, use it and only
1714                  * it, reporting errors to the user if it cannot be used.
1715                  * Or use file guest_kallsyms inputted by user on commandline
1716                  */
1717                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1718                         err = dso__load_vmlinux(dso, map,
1719                                                 symbol_conf.default_guest_vmlinux_name,
1720                                                 false, filter);
1721                         return err;
1722                 }
1723
1724                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1725                 if (!kallsyms_filename)
1726                         return -1;
1727         } else {
1728                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1729                 kallsyms_filename = path;
1730         }
1731
1732         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1733         if (err > 0)
1734                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1735         if (err > 0 && !dso__is_kcore(dso)) {
1736                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1737                 machine__mmap_name(machine, path, sizeof(path));
1738                 dso__set_long_name(dso, strdup(path), true);
1739                 map__fixup_start(map);
1740                 map__fixup_end(map);
1741         }
1742
1743         return err;
1744 }
1745
1746 static void vmlinux_path__exit(void)
1747 {
1748         while (--vmlinux_path__nr_entries >= 0)
1749                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1750
1751         zfree(&vmlinux_path);
1752 }
1753
1754 static int vmlinux_path__init(struct perf_session_env *env)
1755 {
1756         struct utsname uts;
1757         char bf[PATH_MAX];
1758         char *kernel_version;
1759
1760         vmlinux_path = malloc(sizeof(char *) * 6);
1761         if (vmlinux_path == NULL)
1762                 return -1;
1763
1764         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1765         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1766                 goto out_fail;
1767         ++vmlinux_path__nr_entries;
1768         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1769         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1770                 goto out_fail;
1771         ++vmlinux_path__nr_entries;
1772
1773         /* only try kernel version if no symfs was given */
1774         if (symbol_conf.symfs[0] != 0)
1775                 return 0;
1776
1777         if (env) {
1778                 kernel_version = env->os_release;
1779         } else {
1780                 if (uname(&uts) < 0)
1781                         goto out_fail;
1782
1783                 kernel_version = uts.release;
1784         }
1785
1786         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1787         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1788         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1789                 goto out_fail;
1790         ++vmlinux_path__nr_entries;
1791         snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
1792                  kernel_version);
1793         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1794         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1795                 goto out_fail;
1796         ++vmlinux_path__nr_entries;
1797         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1798         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1799         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1800                 goto out_fail;
1801         ++vmlinux_path__nr_entries;
1802         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1803                  kernel_version);
1804         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1805         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1806                 goto out_fail;
1807         ++vmlinux_path__nr_entries;
1808
1809         return 0;
1810
1811 out_fail:
1812         vmlinux_path__exit();
1813         return -1;
1814 }
1815
1816 int setup_list(struct strlist **list, const char *list_str,
1817                       const char *list_name)
1818 {
1819         if (list_str == NULL)
1820                 return 0;
1821
1822         *list = strlist__new(true, list_str);
1823         if (!*list) {
1824                 pr_err("problems parsing %s list\n", list_name);
1825                 return -1;
1826         }
1827         return 0;
1828 }
1829
1830 static bool symbol__read_kptr_restrict(void)
1831 {
1832         bool value = false;
1833
1834         if (geteuid() != 0) {
1835                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1836                 if (fp != NULL) {
1837                         char line[8];
1838
1839                         if (fgets(line, sizeof(line), fp) != NULL)
1840                                 value = atoi(line) != 0;
1841
1842                         fclose(fp);
1843                 }
1844         }
1845
1846         return value;
1847 }
1848
1849 int symbol__init(struct perf_session_env *env)
1850 {
1851         const char *symfs;
1852
1853         if (symbol_conf.initialized)
1854                 return 0;
1855
1856         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1857
1858         symbol__elf_init();
1859
1860         if (symbol_conf.sort_by_name)
1861                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1862                                           sizeof(struct symbol));
1863
1864         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1865                 return -1;
1866
1867         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1868                 pr_err("'.' is the only non valid --field-separator argument\n");
1869                 return -1;
1870         }
1871
1872         if (setup_list(&symbol_conf.dso_list,
1873                        symbol_conf.dso_list_str, "dso") < 0)
1874                 return -1;
1875
1876         if (setup_list(&symbol_conf.comm_list,
1877                        symbol_conf.comm_list_str, "comm") < 0)
1878                 goto out_free_dso_list;
1879
1880         if (setup_list(&symbol_conf.sym_list,
1881                        symbol_conf.sym_list_str, "symbol") < 0)
1882                 goto out_free_comm_list;
1883
1884         /*
1885          * A path to symbols of "/" is identical to ""
1886          * reset here for simplicity.
1887          */
1888         symfs = realpath(symbol_conf.symfs, NULL);
1889         if (symfs == NULL)
1890                 symfs = symbol_conf.symfs;
1891         if (strcmp(symfs, "/") == 0)
1892                 symbol_conf.symfs = "";
1893         if (symfs != symbol_conf.symfs)
1894                 free((void *)symfs);
1895
1896         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1897
1898         symbol_conf.initialized = true;
1899         return 0;
1900
1901 out_free_comm_list:
1902         strlist__delete(symbol_conf.comm_list);
1903 out_free_dso_list:
1904         strlist__delete(symbol_conf.dso_list);
1905         return -1;
1906 }
1907
1908 void symbol__exit(void)
1909 {
1910         if (!symbol_conf.initialized)
1911                 return;
1912         strlist__delete(symbol_conf.sym_list);
1913         strlist__delete(symbol_conf.dso_list);
1914         strlist__delete(symbol_conf.comm_list);
1915         vmlinux_path__exit();
1916         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1917         symbol_conf.initialized = false;
1918 }