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__GUEST_KMODULE_COMP,
  55         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  56         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  57         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  58         DSO_BINARY_TYPE__NOT_FOUND,
  59 };
  60
  61 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  62
  63 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  64 {
  65         symbol_type = toupper(symbol_type);
  66
  67         switch (map_type) {
  68         case MAP__FUNCTION:
  69                 return symbol_type == 'T' || symbol_type == 'W';
  70         case MAP__VARIABLE:
  71                 return symbol_type == 'D';
  72         default:
  73                 return false;
  74         }
  75 }
  76
  77 static int prefix_underscores_count(const char *str)
  78 {
  79         const char *tail = str;
  80
  81         while (*tail == '_')
  82                 tail++;
  83
  84         return tail - str;
  85 }
  86
  87 #define SYMBOL_A 0
  88 #define SYMBOL_B 1
  89
  90 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
  91 {
  92         s64 a;
  93         s64 b;
  94         size_t na, nb;
  95
  96         /* Prefer a symbol with non zero length */
  97         a = syma->end - syma->start;
  98         b = symb->end - symb->start;
  99         if ((b == 0) && (a > 0))
 100                 return SYMBOL_A;
 101         else if ((a == 0) && (b > 0))
 102                 return SYMBOL_B;
 103
 104         /* Prefer a non weak symbol over a weak one */
 105         a = syma->binding == STB_WEAK;
 106         b = symb->binding == STB_WEAK;
 107         if (b && !a)
 108                 return SYMBOL_A;
 109         if (a && !b)
 110                 return SYMBOL_B;
 111
 112         /* Prefer a global symbol over a non global one */
 113         a = syma->binding == STB_GLOBAL;
 114         b = symb->binding == STB_GLOBAL;
 115         if (a && !b)
 116                 return SYMBOL_A;
 117         if (b && !a)
 118                 return SYMBOL_B;
 119
 120         /* Prefer a symbol with less underscores */
 121         a = prefix_underscores_count(syma->name);
 122         b = prefix_underscores_count(symb->name);
 123         if (b > a)
 124                 return SYMBOL_A;
 125         else if (a > b)
 126                 return SYMBOL_B;
 127
 128         /* Choose the symbol with the longest name */
 129         na = strlen(syma->name);
 130         nb = strlen(symb->name);
 131         if (na > nb)
 132                 return SYMBOL_A;
 133         else if (na < nb)
 134                 return SYMBOL_B;
 135
 136         /* Avoid "SyS" kernel syscall aliases */
 137         if (na >= 3 && !strncmp(syma->name, "SyS", 3))
 138                 return SYMBOL_B;
 139         if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 140                 return SYMBOL_B;
 141
 142         return SYMBOL_A;
 143 }
 144
 145 void symbols__fixup_duplicate(struct rb_root *symbols)
 146 {
 147         struct rb_node *nd;
 148         struct symbol *curr, *next;
 149
 150         nd = rb_first(symbols);
 151
 152         while (nd) {
 153                 curr = rb_entry(nd, struct symbol, rb_node);
 154 again:
 155                 nd = rb_next(&curr->rb_node);
 156                 next = rb_entry(nd, struct symbol, rb_node);
 157
 158                 if (!nd)
 159                         break;
 160
 161                 if (curr->start != next->start)
 162                         continue;
 163
 164                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
 165                         rb_erase(&next->rb_node, symbols);
 166                         symbol__delete(next);
 167                         goto again;
 168                 } else {
 169                         nd = rb_next(&curr->rb_node);
 170                         rb_erase(&curr->rb_node, symbols);
 171                         symbol__delete(curr);
 172                 }
 173         }
 174 }
 175
 176 void symbols__fixup_end(struct rb_root *symbols)
 177 {
 178         struct rb_node *nd, *prevnd = rb_first(symbols);
 179         struct symbol *curr, *prev;
 180
 181         if (prevnd == NULL)
 182                 return;
 183
 184         curr = rb_entry(prevnd, struct symbol, rb_node);
 185
 186         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 187                 prev = curr;
 188                 curr = rb_entry(nd, struct symbol, rb_node);
 189
 190                 if (prev->end == prev->start && prev->end != curr->start)
 191                         prev->end = curr->start;
 192         }
 193
 194         /* Last entry */
 195         if (curr->end == curr->start)
 196                 curr->end = roundup(curr->start, 4096);
 197 }
 198
 199 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 200 {
 201         struct map *prev, *curr;
 202         struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
 203
 204         if (prevnd == NULL)
 205                 return;
 206
 207         curr = rb_entry(prevnd, struct map, rb_node);
 208
 209         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 210                 prev = curr;
 211                 curr = rb_entry(nd, struct map, rb_node);
 212                 prev->end = curr->start;
 213         }
 214
 215         /*
 216          * We still haven't the actual symbols, so guess the
 217          * last map final address.
 218          */
 219         curr->end = ~0ULL;
 220 }
 221
 222 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 223 {
 224         size_t namelen = strlen(name) + 1;
 225         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 226                                         sizeof(*sym) + namelen));
 227         if (sym == NULL)
 228                 return NULL;
 229
 230         if (symbol_conf.priv_size)
 231                 sym = ((void *)sym) + symbol_conf.priv_size;
 232
 233         sym->start   = start;
 234         sym->end     = len ? start + len : start;
 235         sym->binding = binding;
 236         sym->namelen = namelen - 1;
 237
 238         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 239                   __func__, name, start, sym->end);
 240         memcpy(sym->name, name, namelen);
 241
 242         return sym;
 243 }
 244
 245 void symbol__delete(struct symbol *sym)
 246 {
 247         free(((void *)sym) - symbol_conf.priv_size);
 248 }
 249
 250 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
 251 {
 252         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
 253                        sym->start, sym->end,
 254                        sym->binding == STB_GLOBAL ? 'g' :
 255                        sym->binding == STB_LOCAL  ? 'l' : 'w',
 256                        sym->name);
 257 }
 258
 259 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 260                                     const struct addr_location *al, FILE *fp)
 261 {
 262         unsigned long offset;
 263         size_t length;
 264
 265         if (sym && sym->name) {
 266                 length = fprintf(fp, "%s", sym->name);
 267                 if (al) {
 268                         if (al->addr < sym->end)
 269                                 offset = al->addr - sym->start;
 270                         else
 271                                 offset = al->addr - al->map->start - sym->start;
 272                         length += fprintf(fp, "+0x%lx", offset);
 273                 }
 274                 return length;
 275         } else
 276                 return fprintf(fp, "[unknown]");
 277 }
 278
 279 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
 280 {
 281         return symbol__fprintf_symname_offs(sym, NULL, fp);
 282 }
 283
 284 void symbols__delete(struct rb_root *symbols)
 285 {
 286         struct symbol *pos;
 287         struct rb_node *next = rb_first(symbols);
 288
 289         while (next) {
 290                 pos = rb_entry(next, struct symbol, rb_node);
 291                 next = rb_next(&pos->rb_node);
 292                 rb_erase(&pos->rb_node, symbols);
 293                 symbol__delete(pos);
 294         }
 295 }
 296
 297 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 298 {
 299         struct rb_node **p = &symbols->rb_node;
 300         struct rb_node *parent = NULL;
 301         const u64 ip = sym->start;
 302         struct symbol *s;
 303
 304         while (*p != NULL) {
 305                 parent = *p;
 306                 s = rb_entry(parent, struct symbol, rb_node);
 307                 if (ip < s->start)
 308                         p = &(*p)->rb_left;
 309                 else
 310                         p = &(*p)->rb_right;
 311         }
 312         rb_link_node(&sym->rb_node, parent, p);
 313         rb_insert_color(&sym->rb_node, symbols);
 314 }
 315
 316 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
 317 {
 318         struct rb_node *n;
 319
 320         if (symbols == NULL)
 321                 return NULL;
 322
 323         n = symbols->rb_node;
 324
 325         while (n) {
 326                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 327
 328                 if (ip < s->start)
 329                         n = n->rb_left;
 330                 else if (ip >= s->end)
 331                         n = n->rb_right;
 332                 else
 333                         return s;
 334         }
 335
 336         return NULL;
 337 }
 338
 339 static struct symbol *symbols__first(struct rb_root *symbols)
 340 {
 341         struct rb_node *n = rb_first(symbols);
 342
 343         if (n)
 344                 return rb_entry(n, struct symbol, rb_node);
 345
 346         return NULL;
 347 }
 348
 349 static struct symbol *symbols__next(struct symbol *sym)
 350 {
 351         struct rb_node *n = rb_next(&sym->rb_node);
 352
 353         if (n)
 354                 return rb_entry(n, struct symbol, rb_node);
 355
 356         return NULL;
 357 }
 358
 359 struct symbol_name_rb_node {
 360         struct rb_node  rb_node;
 361         struct symbol   sym;
 362 };
 363
 364 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
 365 {
 366         struct rb_node **p = &symbols->rb_node;
 367         struct rb_node *parent = NULL;
 368         struct symbol_name_rb_node *symn, *s;
 369
 370         symn = container_of(sym, struct symbol_name_rb_node, sym);
 371
 372         while (*p != NULL) {
 373                 parent = *p;
 374                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 375                 if (strcmp(sym->name, s->sym.name) < 0)
 376                         p = &(*p)->rb_left;
 377                 else
 378                         p = &(*p)->rb_right;
 379         }
 380         rb_link_node(&symn->rb_node, parent, p);
 381         rb_insert_color(&symn->rb_node, symbols);
 382 }
 383
 384 static void symbols__sort_by_name(struct rb_root *symbols,
 385                                   struct rb_root *source)
 386 {
 387         struct rb_node *nd;
 388
 389         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 390                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 391                 symbols__insert_by_name(symbols, pos);
 392         }
 393 }
 394
 395 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
 396                                             const char *name)
 397 {
 398         struct rb_node *n;
 399
 400         if (symbols == NULL)
 401                 return NULL;
 402
 403         n = symbols->rb_node;
 404
 405         while (n) {
 406                 struct symbol_name_rb_node *s;
 407                 int cmp;
 408
 409                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 410                 cmp = strcmp(name, s->sym.name);
 411
 412                 if (cmp < 0)
 413                         n = n->rb_left;
 414                 else if (cmp > 0)
 415                         n = n->rb_right;
 416                 else
 417                         return &s->sym;
 418         }
 419
 420         return NULL;
 421 }
 422
 423 struct symbol *dso__find_symbol(struct dso *dso,
 424                                 enum map_type type, u64 addr)
 425 {
 426         return symbols__find(&dso->symbols[type], addr);
 427 }
 428
 429 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 430 {
 431         return symbols__first(&dso->symbols[type]);
 432 }
 433
 434 struct symbol *dso__next_symbol(struct symbol *sym)
 435 {
 436         return symbols__next(sym);
 437 }
 438
 439 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 440                                         const char *name)
 441 {
 442         return symbols__find_by_name(&dso->symbol_names[type], name);
 443 }
 444
 445 void dso__sort_by_name(struct dso *dso, enum map_type type)
 446 {
 447         dso__set_sorted_by_name(dso, type);
 448         return symbols__sort_by_name(&dso->symbol_names[type],
 449                                      &dso->symbols[type]);
 450 }
 451
 452 size_t dso__fprintf_symbols_by_name(struct dso *dso,
 453                                     enum map_type type, FILE *fp)
 454 {
 455         size_t ret = 0;
 456         struct rb_node *nd;
 457         struct symbol_name_rb_node *pos;
 458
 459         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
 460                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 461                 fprintf(fp, "%s\n", pos->sym.name);
 462         }
 463
 464         return ret;
 465 }
 466
 467 int modules__parse(const char *filename, void *arg,
 468                    int (*process_module)(void *arg, const char *name,
 469                                          u64 start))
 470 {
 471         char *line = NULL;
 472         size_t n;
 473         FILE *file;
 474         int err = 0;
 475
 476         file = fopen(filename, "r");
 477         if (file == NULL)
 478                 return -1;
 479
 480         while (1) {
 481                 char name[PATH_MAX];
 482                 u64 start;
 483                 char *sep;
 484                 ssize_t line_len;
 485
 486                 line_len = getline(&line, &n, file);
 487                 if (line_len < 0) {
 488                         if (feof(file))
 489                                 break;
 490                         err = -1;
 491                         goto out;
 492                 }
 493
 494                 if (!line) {
 495                         err = -1;
 496                         goto out;
 497                 }
 498
 499                 line[--line_len] = '\0'; /* \n */
 500
 501                 sep = strrchr(line, 'x');
 502                 if (sep == NULL)
 503                         continue;
 504
 505                 hex2u64(sep + 1, &start);
 506
 507                 sep = strchr(line, ' ');
 508                 if (sep == NULL)
 509                         continue;
 510
 511                 *sep = '\0';
 512
 513                 scnprintf(name, sizeof(name), "[%s]", line);
 514
 515                 err = process_module(arg, name, start);
 516                 if (err)
 517                         break;
 518         }
 519 out:
 520         free(line);
 521         fclose(file);
 522         return err;
 523 }
 524
 525 struct process_kallsyms_args {
 526         struct map *map;
 527         struct dso *dso;
 528 };
 529
 530 /*
 531  * These are symbols in the kernel image, so make sure that
 532  * sym is from a kernel DSO.
 533  */
 534 bool symbol__is_idle(struct symbol *sym)
 535 {
 536         const char * const idle_symbols[] = {
 537                 "cpu_idle",
 538                 "cpu_startup_entry",
 539                 "intel_idle",
 540                 "default_idle",
 541                 "native_safe_halt",
 542                 "enter_idle",
 543                 "exit_idle",
 544                 "mwait_idle",
 545                 "mwait_idle_with_hints",
 546                 "poll_idle",
 547                 "ppc64_runlatch_off",
 548                 "pseries_dedicated_idle_sleep",
 549                 NULL
 550         };
 551
 552         int i;
 553
 554         if (!sym)
 555                 return false;
 556
 557         for (i = 0; idle_symbols[i]; i++) {
 558                 if (!strcmp(idle_symbols[i], sym->name))
 559                         return true;
 560         }
 561
 562         return false;
 563 }
 564
 565 static int map__process_kallsym_symbol(void *arg, const char *name,
 566                                        char type, u64 start)
 567 {
 568         struct symbol *sym;
 569         struct process_kallsyms_args *a = arg;
 570         struct rb_root *root = &a->dso->symbols[a->map->type];
 571
 572         if (!symbol_type__is_a(type, a->map->type))
 573                 return 0;
 574
 575         /*
 576          * module symbols are not sorted so we add all
 577          * symbols, setting length to 0, and rely on
 578          * symbols__fixup_end() to fix it up.
 579          */
 580         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
 581         if (sym == NULL)
 582                 return -ENOMEM;
 583         /*
 584          * We will pass the symbols to the filter later, in
 585          * map__split_kallsyms, when we have split the maps per module
 586          */
 587         symbols__insert(root, sym);
 588
 589         return 0;
 590 }
 591
 592 /*
 593  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 594  * so that we can in the next step set the symbol ->end address and then
 595  * call kernel_maps__split_kallsyms.
 596  */
 597 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 598                                   struct map *map)
 599 {
 600         struct process_kallsyms_args args = { .map = map, .dso = dso, };
 601         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 602 }
 603
 604 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
 605                                          symbol_filter_t filter)
 606 {
 607         struct map_groups *kmaps = map__kmap(map)->kmaps;
 608         struct map *curr_map;
 609         struct symbol *pos;
 610         int count = 0, moved = 0;
 611         struct rb_root *root = &dso->symbols[map->type];
 612         struct rb_node *next = rb_first(root);
 613
 614         while (next) {
 615                 char *module;
 616
 617                 pos = rb_entry(next, struct symbol, rb_node);
 618                 next = rb_next(&pos->rb_node);
 619
 620                 module = strchr(pos->name, '\t');
 621                 if (module)
 622                         *module = '\0';
 623
 624                 curr_map = map_groups__find(kmaps, map->type, pos->start);
 625
 626                 if (!curr_map || (filter && filter(curr_map, pos))) {
 627                         rb_erase(&pos->rb_node, root);
 628                         symbol__delete(pos);
 629                 } else {
 630                         pos->start -= curr_map->start - curr_map->pgoff;
 631                         if (pos->end)
 632                                 pos->end -= curr_map->start - curr_map->pgoff;
 633                         if (curr_map != map) {
 634                                 rb_erase(&pos->rb_node, root);
 635                                 symbols__insert(
 636                                         &curr_map->dso->symbols[curr_map->type],
 637                                         pos);
 638                                 ++moved;
 639                         } else {
 640                                 ++count;
 641                         }
 642                 }
 643         }
 644
 645         /* Symbols have been adjusted */
 646         dso->adjust_symbols = 1;
 647
 648         return count + moved;
 649 }
 650
 651 /*
 652  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 653  * kernel range is broken in several maps, named [kernel].N, as we don't have
 654  * the original ELF section names vmlinux have.
 655  */
 656 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
 657                                symbol_filter_t filter)
 658 {
 659         struct map_groups *kmaps = map__kmap(map)->kmaps;
 660         struct machine *machine = kmaps->machine;
 661         struct map *curr_map = map;
 662         struct symbol *pos;
 663         int count = 0, moved = 0;
 664         struct rb_root *root = &dso->symbols[map->type];
 665         struct rb_node *next = rb_first(root);
 666         int kernel_range = 0;
 667
 668         while (next) {
 669                 char *module;
 670
 671                 pos = rb_entry(next, struct symbol, rb_node);
 672                 next = rb_next(&pos->rb_node);
 673
 674                 module = strchr(pos->name, '\t');
 675                 if (module) {
 676                         if (!symbol_conf.use_modules)
 677                                 goto discard_symbol;
 678
 679                         *module++ = '\0';
 680
 681                         if (strcmp(curr_map->dso->short_name, module)) {
 682                                 if (curr_map != map &&
 683                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 684                                     machine__is_default_guest(machine)) {
 685                                         /*
 686                                          * We assume all symbols of a module are
 687                                          * continuous in * kallsyms, so curr_map
 688                                          * points to a module and all its
 689                                          * symbols are in its kmap. Mark it as
 690                                          * loaded.
 691                                          */
 692                                         dso__set_loaded(curr_map->dso,
 693                                                         curr_map->type);
 694                                 }
 695
 696                                 curr_map = map_groups__find_by_name(kmaps,
 697                                                         map->type, module);
 698                                 if (curr_map == NULL) {
 699                                         pr_debug("%s/proc/{kallsyms,modules} "
 700                                                  "inconsistency while looking "
 701                                                  "for \"%s\" module!\n",
 702                                                  machine->root_dir, module);
 703                                         curr_map = map;
 704                                         goto discard_symbol;
 705                                 }
 706
 707                                 if (curr_map->dso->loaded &&
 708                                     !machine__is_default_guest(machine))
 709                                         goto discard_symbol;
 710                         }
 711                         /*
 712                          * So that we look just like we get from .ko files,
 713                          * i.e. not prelinked, relative to map->start.
 714                          */
 715                         pos->start = curr_map->map_ip(curr_map, pos->start);
 716                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 717                 } else if (curr_map != map) {
 718                         char dso_name[PATH_MAX];
 719                         struct dso *ndso;
 720
 721                         if (delta) {
 722                                 /* Kernel was relocated at boot time */
 723                                 pos->start -= delta;
 724                                 pos->end -= delta;
 725                         }
 726
 727                         if (count == 0) {
 728                                 curr_map = map;
 729                                 goto filter_symbol;
 730                         }
 731
 732                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 733                                 snprintf(dso_name, sizeof(dso_name),
 734                                         "[guest.kernel].%d",
 735                                         kernel_range++);
 736                         else
 737                                 snprintf(dso_name, sizeof(dso_name),
 738                                         "[kernel].%d",
 739                                         kernel_range++);
 740
 741                         ndso = dso__new(dso_name);
 742                         if (ndso == NULL)
 743                                 return -1;
 744
 745                         ndso->kernel = dso->kernel;
 746
 747                         curr_map = map__new2(pos->start, ndso, map->type);
 748                         if (curr_map == NULL) {
 749                                 dso__delete(ndso);
 750                                 return -1;
 751                         }
 752
 753                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 754                         map_groups__insert(kmaps, curr_map);
 755                         ++kernel_range;
 756                 } else if (delta) {
 757                         /* Kernel was relocated at boot time */
 758                         pos->start -= delta;
 759                         pos->end -= delta;
 760                 }
 761 filter_symbol:
 762                 if (filter && filter(curr_map, pos)) {
 763 discard_symbol:         rb_erase(&pos->rb_node, root);
 764                         symbol__delete(pos);
 765                 } else {
 766                         if (curr_map != map) {
 767                                 rb_erase(&pos->rb_node, root);
 768                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 769                                 ++moved;
 770                         } else
 771                                 ++count;
 772                 }
 773         }
 774
 775         if (curr_map != map &&
 776             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 777             machine__is_default_guest(kmaps->machine)) {
 778                 dso__set_loaded(curr_map->dso, curr_map->type);
 779         }
 780
 781         return count + moved;
 782 }
 783
 784 bool symbol__restricted_filename(const char *filename,
 785                                  const char *restricted_filename)
 786 {
 787         bool restricted = false;
 788
 789         if (symbol_conf.kptr_restrict) {
 790                 char *r = realpath(filename, NULL);
 791
 792                 if (r != NULL) {
 793                         restricted = strcmp(r, restricted_filename) == 0;
 794                         free(r);
 795                         return restricted;
 796                 }
 797         }
 798
 799         return restricted;
 800 }
 801
 802 struct module_info {
 803         struct rb_node rb_node;
 804         char *name;
 805         u64 start;
 806 };
 807
 808 static void add_module(struct module_info *mi, struct rb_root *modules)
 809 {
 810         struct rb_node **p = &modules->rb_node;
 811         struct rb_node *parent = NULL;
 812         struct module_info *m;
 813
 814         while (*p != NULL) {
 815                 parent = *p;
 816                 m = rb_entry(parent, struct module_info, rb_node);
 817                 if (strcmp(mi->name, m->name) < 0)
 818                         p = &(*p)->rb_left;
 819                 else
 820                         p = &(*p)->rb_right;
 821         }
 822         rb_link_node(&mi->rb_node, parent, p);
 823         rb_insert_color(&mi->rb_node, modules);
 824 }
 825
 826 static void delete_modules(struct rb_root *modules)
 827 {
 828         struct module_info *mi;
 829         struct rb_node *next = rb_first(modules);
 830
 831         while (next) {
 832                 mi = rb_entry(next, struct module_info, rb_node);
 833                 next = rb_next(&mi->rb_node);
 834                 rb_erase(&mi->rb_node, modules);
 835                 zfree(&mi->name);
 836                 free(mi);
 837         }
 838 }
 839
 840 static struct module_info *find_module(const char *name,
 841                                        struct rb_root *modules)
 842 {
 843         struct rb_node *n = modules->rb_node;
 844
 845         while (n) {
 846                 struct module_info *m;
 847                 int cmp;
 848
 849                 m = rb_entry(n, struct module_info, rb_node);
 850                 cmp = strcmp(name, m->name);
 851                 if (cmp < 0)
 852                         n = n->rb_left;
 853                 else if (cmp > 0)
 854                         n = n->rb_right;
 855                 else
 856                         return m;
 857         }
 858
 859         return NULL;
 860 }
 861
 862 static int __read_proc_modules(void *arg, const char *name, u64 start)
 863 {
 864         struct rb_root *modules = arg;
 865         struct module_info *mi;
 866
 867         mi = zalloc(sizeof(struct module_info));
 868         if (!mi)
 869                 return -ENOMEM;
 870
 871         mi->name = strdup(name);
 872         mi->start = start;
 873
 874         if (!mi->name) {
 875                 free(mi);
 876                 return -ENOMEM;
 877         }
 878
 879         add_module(mi, modules);
 880
 881         return 0;
 882 }
 883
 884 static int read_proc_modules(const char *filename, struct rb_root *modules)
 885 {
 886         if (symbol__restricted_filename(filename, "/proc/modules"))
 887                 return -1;
 888
 889         if (modules__parse(filename, modules, __read_proc_modules)) {
 890                 delete_modules(modules);
 891                 return -1;
 892         }
 893
 894         return 0;
 895 }
 896
 897 int compare_proc_modules(const char *from, const char *to)
 898 {
 899         struct rb_root from_modules = RB_ROOT;
 900         struct rb_root to_modules = RB_ROOT;
 901         struct rb_node *from_node, *to_node;
 902         struct module_info *from_m, *to_m;
 903         int ret = -1;
 904
 905         if (read_proc_modules(from, &from_modules))
 906                 return -1;
 907
 908         if (read_proc_modules(to, &to_modules))
 909                 goto out_delete_from;
 910
 911         from_node = rb_first(&from_modules);
 912         to_node = rb_first(&to_modules);
 913         while (from_node) {
 914                 if (!to_node)
 915                         break;
 916
 917                 from_m = rb_entry(from_node, struct module_info, rb_node);
 918                 to_m = rb_entry(to_node, struct module_info, rb_node);
 919
 920                 if (from_m->start != to_m->start ||
 921                     strcmp(from_m->name, to_m->name))
 922                         break;
 923
 924                 from_node = rb_next(from_node);
 925                 to_node = rb_next(to_node);
 926         }
 927
 928         if (!from_node && !to_node)
 929                 ret = 0;
 930
 931         delete_modules(&to_modules);
 932 out_delete_from:
 933         delete_modules(&from_modules);
 934
 935         return ret;
 936 }
 937
 938 static int do_validate_kcore_modules(const char *filename, struct map *map,
 939                                   struct map_groups *kmaps)
 940 {
 941         struct rb_root modules = RB_ROOT;
 942         struct map *old_map;
 943         int err;
 944
 945         err = read_proc_modules(filename, &modules);
 946         if (err)
 947                 return err;
 948
 949         old_map = map_groups__first(kmaps, map->type);
 950         while (old_map) {
 951                 struct map *next = map_groups__next(old_map);
 952                 struct module_info *mi;
 953
 954                 if (old_map == map || old_map->start == map->start) {
 955                         /* The kernel map */
 956                         old_map = next;
 957                         continue;
 958                 }
 959
 960                 /* Module must be in memory at the same address */
 961                 mi = find_module(old_map->dso->short_name, &modules);
 962                 if (!mi || mi->start != old_map->start) {
 963                         err = -EINVAL;
 964                         goto out;
 965                 }
 966
 967                 old_map = next;
 968         }
 969 out:
 970         delete_modules(&modules);
 971         return err;
 972 }
 973
 974 /*
 975  * If kallsyms is referenced by name then we look for filename in the same
 976  * directory.
 977  */
 978 static bool filename_from_kallsyms_filename(char *filename,
 979                                             const char *base_name,
 980                                             const char *kallsyms_filename)
 981 {
 982         char *name;
 983
 984         strcpy(filename, kallsyms_filename);
 985         name = strrchr(filename, '/');
 986         if (!name)
 987                 return false;
 988
 989         name += 1;
 990
 991         if (!strcmp(name, "kallsyms")) {
 992                 strcpy(name, base_name);
 993                 return true;
 994         }
 995
 996         return false;
 997 }
 998
 999 static int validate_kcore_modules(const char *kallsyms_filename,
1000                                   struct map *map)
1001 {
1002         struct map_groups *kmaps = map__kmap(map)->kmaps;
1003         char modules_filename[PATH_MAX];
1004
1005         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1006                                              kallsyms_filename))
1007                 return -EINVAL;
1008
1009         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1010                 return -EINVAL;
1011
1012         return 0;
1013 }
1014
1015 static int validate_kcore_addresses(const char *kallsyms_filename,
1016                                     struct map *map)
1017 {
1018         struct kmap *kmap = map__kmap(map);
1019
1020         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1021                 u64 start;
1022
1023                 start = kallsyms__get_function_start(kallsyms_filename,
1024                                                      kmap->ref_reloc_sym->name);
1025                 if (start != kmap->ref_reloc_sym->addr)
1026                         return -EINVAL;
1027         }
1028
1029         return validate_kcore_modules(kallsyms_filename, map);
1030 }
1031
1032 struct kcore_mapfn_data {
1033         struct dso *dso;
1034         enum map_type type;
1035         struct list_head maps;
1036 };
1037
1038 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1039 {
1040         struct kcore_mapfn_data *md = data;
1041         struct map *map;
1042
1043         map = map__new2(start, md->dso, md->type);
1044         if (map == NULL)
1045                 return -ENOMEM;
1046
1047         map->end = map->start + len;
1048         map->pgoff = pgoff;
1049
1050         list_add(&map->node, &md->maps);
1051
1052         return 0;
1053 }
1054
1055 static int dso__load_kcore(struct dso *dso, struct map *map,
1056                            const char *kallsyms_filename)
1057 {
1058         struct map_groups *kmaps = map__kmap(map)->kmaps;
1059         struct machine *machine = kmaps->machine;
1060         struct kcore_mapfn_data md;
1061         struct map *old_map, *new_map, *replacement_map = NULL;
1062         bool is_64_bit;
1063         int err, fd;
1064         char kcore_filename[PATH_MAX];
1065         struct symbol *sym;
1066
1067         /* This function requires that the map is the kernel map */
1068         if (map != machine->vmlinux_maps[map->type])
1069                 return -EINVAL;
1070
1071         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1072                                              kallsyms_filename))
1073                 return -EINVAL;
1074
1075         /* Modules and kernel must be present at their original addresses */
1076         if (validate_kcore_addresses(kallsyms_filename, map))
1077                 return -EINVAL;
1078
1079         md.dso = dso;
1080         md.type = map->type;
1081         INIT_LIST_HEAD(&md.maps);
1082
1083         fd = open(kcore_filename, O_RDONLY);
1084         if (fd < 0)
1085                 return -EINVAL;
1086
1087         /* Read new maps into temporary lists */
1088         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1089                               &is_64_bit);
1090         if (err)
1091                 goto out_err;
1092         dso->is_64_bit = is_64_bit;
1093
1094         if (list_empty(&md.maps)) {
1095                 err = -EINVAL;
1096                 goto out_err;
1097         }
1098
1099         /* Remove old maps */
1100         old_map = map_groups__first(kmaps, map->type);
1101         while (old_map) {
1102                 struct map *next = map_groups__next(old_map);
1103
1104                 if (old_map != map)
1105                         map_groups__remove(kmaps, old_map);
1106                 old_map = next;
1107         }
1108
1109         /* Find the kernel map using the first symbol */
1110         sym = dso__first_symbol(dso, map->type);
1111         list_for_each_entry(new_map, &md.maps, node) {
1112                 if (sym && sym->start >= new_map->start &&
1113                     sym->start < new_map->end) {
1114                         replacement_map = new_map;
1115                         break;
1116                 }
1117         }
1118
1119         if (!replacement_map)
1120                 replacement_map = list_entry(md.maps.next, struct map, node);
1121
1122         /* Add new maps */
1123         while (!list_empty(&md.maps)) {
1124                 new_map = list_entry(md.maps.next, struct map, node);
1125                 list_del(&new_map->node);
1126                 if (new_map == replacement_map) {
1127                         map->start      = new_map->start;
1128                         map->end        = new_map->end;
1129                         map->pgoff      = new_map->pgoff;
1130                         map->map_ip     = new_map->map_ip;
1131                         map->unmap_ip   = new_map->unmap_ip;
1132                         map__delete(new_map);
1133                         /* Ensure maps are correctly ordered */
1134                         map_groups__remove(kmaps, map);
1135                         map_groups__insert(kmaps, map);
1136                 } else {
1137                         map_groups__insert(kmaps, new_map);
1138                 }
1139         }
1140
1141         /*
1142          * Set the data type and long name so that kcore can be read via
1143          * dso__data_read_addr().
1144          */
1145         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1146                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1147         else
1148                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1149         dso__set_long_name(dso, strdup(kcore_filename), true);
1150
1151         close(fd);
1152
1153         if (map->type == MAP__FUNCTION)
1154                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1155         else
1156                 pr_debug("Using %s for kernel data\n", kcore_filename);
1157
1158         return 0;
1159
1160 out_err:
1161         while (!list_empty(&md.maps)) {
1162                 map = list_entry(md.maps.next, struct map, node);
1163                 list_del(&map->node);
1164                 map__delete(map);
1165         }
1166         close(fd);
1167         return -EINVAL;
1168 }
1169
1170 /*
1171  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1172  * delta based on the relocation reference symbol.
1173  */
1174 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1175 {
1176         struct kmap *kmap = map__kmap(map);
1177         u64 addr;
1178
1179         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1180                 return 0;
1181
1182         addr = kallsyms__get_function_start(filename,
1183                                             kmap->ref_reloc_sym->name);
1184         if (!addr)
1185                 return -1;
1186
1187         *delta = addr - kmap->ref_reloc_sym->addr;
1188         return 0;
1189 }
1190
1191 int dso__load_kallsyms(struct dso *dso, const char *filename,
1192                        struct map *map, symbol_filter_t filter)
1193 {
1194         u64 delta = 0;
1195
1196         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1197                 return -1;
1198
1199         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1200                 return -1;
1201
1202         if (kallsyms__delta(map, filename, &delta))
1203                 return -1;
1204
1205         symbols__fixup_duplicate(&dso->symbols[map->type]);
1206         symbols__fixup_end(&dso->symbols[map->type]);
1207
1208         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1209                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1210         else
1211                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1212
1213         if (!dso__load_kcore(dso, map, filename))
1214                 return dso__split_kallsyms_for_kcore(dso, map, filter);
1215         else
1216                 return dso__split_kallsyms(dso, map, delta, filter);
1217 }
1218
1219 static int dso__load_perf_map(struct dso *dso, struct map *map,
1220                               symbol_filter_t filter)
1221 {
1222         char *line = NULL;
1223         size_t n;
1224         FILE *file;
1225         int nr_syms = 0;
1226
1227         file = fopen(dso->long_name, "r");
1228         if (file == NULL)
1229                 goto out_failure;
1230
1231         while (!feof(file)) {
1232                 u64 start, size;
1233                 struct symbol *sym;
1234                 int line_len, len;
1235
1236                 line_len = getline(&line, &n, file);
1237                 if (line_len < 0)
1238                         break;
1239
1240                 if (!line)
1241                         goto out_failure;
1242
1243                 line[--line_len] = '\0'; /* \n */
1244
1245                 len = hex2u64(line, &start);
1246
1247                 len++;
1248                 if (len + 2 >= line_len)
1249                         continue;
1250
1251                 len += hex2u64(line + len, &size);
1252
1253                 len++;
1254                 if (len + 2 >= line_len)
1255                         continue;
1256
1257                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1258
1259                 if (sym == NULL)
1260                         goto out_delete_line;
1261
1262                 if (filter && filter(map, sym))
1263                         symbol__delete(sym);
1264                 else {
1265                         symbols__insert(&dso->symbols[map->type], sym);
1266                         nr_syms++;
1267                 }
1268         }
1269
1270         free(line);
1271         fclose(file);
1272
1273         return nr_syms;
1274
1275 out_delete_line:
1276         free(line);
1277 out_failure:
1278         return -1;
1279 }
1280
1281 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1282                                            enum dso_binary_type type)
1283 {
1284         switch (type) {
1285         case DSO_BINARY_TYPE__JAVA_JIT:
1286         case DSO_BINARY_TYPE__DEBUGLINK:
1287         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1288         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1289         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1290         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1291         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1292                 return !kmod && dso->kernel == DSO_TYPE_USER;
1293
1294         case DSO_BINARY_TYPE__KALLSYMS:
1295         case DSO_BINARY_TYPE__VMLINUX:
1296         case DSO_BINARY_TYPE__KCORE:
1297                 return dso->kernel == DSO_TYPE_KERNEL;
1298
1299         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1300         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1301         case DSO_BINARY_TYPE__GUEST_KCORE:
1302                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1303
1304         case DSO_BINARY_TYPE__GUEST_KMODULE:
1305         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1306         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1307         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1308                 /*
1309                  * kernel modules know their symtab type - it's set when
1310                  * creating a module dso in machine__new_module().
1311                  */
1312                 return kmod && dso->symtab_type == type;
1313
1314         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1315                 return true;
1316
1317         case DSO_BINARY_TYPE__NOT_FOUND:
1318         default:
1319                 return false;
1320         }
1321 }
1322
1323 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1324 {
1325         char *name;
1326         int ret = -1;
1327         u_int i;
1328         struct machine *machine;
1329         char *root_dir = (char *) "";
1330         int ss_pos = 0;
1331         struct symsrc ss_[2];
1332         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1333         bool kmod;
1334
1335         dso__set_loaded(dso, map->type);
1336
1337         if (dso->kernel == DSO_TYPE_KERNEL)
1338                 return dso__load_kernel_sym(dso, map, filter);
1339         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1340                 return dso__load_guest_kernel_sym(dso, map, filter);
1341
1342         if (map->groups && map->groups->machine)
1343                 machine = map->groups->machine;
1344         else
1345                 machine = NULL;
1346
1347         dso->adjust_symbols = 0;
1348
1349         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1350                 struct stat st;
1351
1352                 if (lstat(dso->name, &st) < 0)
1353                         return -1;
1354
1355                 if (st.st_uid && (st.st_uid != geteuid())) {
1356                         pr_warning("File %s not owned by current user or root, "
1357                                 "ignoring it.\n", dso->name);
1358                         return -1;
1359                 }
1360
1361                 ret = dso__load_perf_map(dso, map, filter);
1362                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1363                                              DSO_BINARY_TYPE__NOT_FOUND;
1364                 return ret;
1365         }
1366
1367         if (machine)
1368                 root_dir = machine->root_dir;
1369
1370         name = malloc(PATH_MAX);
1371         if (!name)
1372                 return -1;
1373
1374         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1375                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1376                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1377                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1378
1379         /*
1380          * Iterate over candidate debug images.
1381          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1382          * and/or opd section) for processing.
1383          */
1384         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1385                 struct symsrc *ss = &ss_[ss_pos];
1386                 bool next_slot = false;
1387
1388                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1389
1390                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1391                         continue;
1392
1393                 if (dso__read_binary_type_filename(dso, symtab_type,
1394                                                    root_dir, name, PATH_MAX))
1395                         continue;
1396
1397                 /* Name is now the name of the next image to try */
1398                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1399                         continue;
1400
1401                 if (!syms_ss && symsrc__has_symtab(ss)) {
1402                         syms_ss = ss;
1403                         next_slot = true;
1404                         if (!dso->symsrc_filename)
1405                                 dso->symsrc_filename = strdup(name);
1406                 }
1407
1408                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1409                         runtime_ss = ss;
1410                         next_slot = true;
1411                 }
1412
1413                 if (next_slot) {
1414                         ss_pos++;
1415
1416                         if (syms_ss && runtime_ss)
1417                                 break;
1418                 } else {
1419                         symsrc__destroy(ss);
1420                 }
1421
1422         }
1423
1424         if (!runtime_ss && !syms_ss)
1425                 goto out_free;
1426
1427         if (runtime_ss && !syms_ss) {
1428                 syms_ss = runtime_ss;
1429         }
1430
1431         /* We'll have to hope for the best */
1432         if (!runtime_ss && syms_ss)
1433                 runtime_ss = syms_ss;
1434
1435         if (syms_ss)
1436                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1437         else
1438                 ret = -1;
1439
1440         if (ret > 0) {
1441                 int nr_plt;
1442
1443                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1444                 if (nr_plt > 0)
1445                         ret += nr_plt;
1446         }
1447
1448         for (; ss_pos > 0; ss_pos--)
1449                 symsrc__destroy(&ss_[ss_pos - 1]);
1450 out_free:
1451         free(name);
1452         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1453                 return 0;
1454         return ret;
1455 }
1456
1457 struct map *map_groups__find_by_name(struct map_groups *mg,
1458                                      enum map_type type, const char *name)
1459 {
1460         struct rb_node *nd;
1461
1462         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1463                 struct map *map = rb_entry(nd, struct map, rb_node);
1464
1465                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1466                         return map;
1467         }
1468
1469         return NULL;
1470 }
1471
1472 int dso__load_vmlinux(struct dso *dso, struct map *map,
1473                       const char *vmlinux, bool vmlinux_allocated,
1474                       symbol_filter_t filter)
1475 {
1476         int err = -1;
1477         struct symsrc ss;
1478         char symfs_vmlinux[PATH_MAX];
1479         enum dso_binary_type symtab_type;
1480
1481         if (vmlinux[0] == '/')
1482                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1483         else
1484                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1485
1486         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1487                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1488         else
1489                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1490
1491         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1492                 return -1;
1493
1494         err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1495         symsrc__destroy(&ss);
1496
1497         if (err > 0) {
1498                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1499                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1500                 else
1501                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1502                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1503                 dso__set_loaded(dso, map->type);
1504                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1505         }
1506
1507         return err;
1508 }
1509
1510 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1511                            symbol_filter_t filter)
1512 {
1513         int i, err = 0;
1514         char *filename;
1515
1516         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1517                  vmlinux_path__nr_entries + 1);
1518
1519         filename = dso__build_id_filename(dso, NULL, 0);
1520         if (filename != NULL) {
1521                 err = dso__load_vmlinux(dso, map, filename, true, filter);
1522                 if (err > 0)
1523                         goto out;
1524                 free(filename);
1525         }
1526
1527         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1528                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1529                 if (err > 0)
1530                         break;
1531         }
1532 out:
1533         return err;
1534 }
1535
1536 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1537 {
1538         char kallsyms_filename[PATH_MAX];
1539         struct dirent *dent;
1540         int ret = -1;
1541         DIR *d;
1542
1543         d = opendir(dir);
1544         if (!d)
1545                 return -1;
1546
1547         while (1) {
1548                 dent = readdir(d);
1549                 if (!dent)
1550                         break;
1551                 if (dent->d_type != DT_DIR)
1552                         continue;
1553                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1554                           "%s/%s/kallsyms", dir, dent->d_name);
1555                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1556                         strlcpy(dir, kallsyms_filename, dir_sz);
1557                         ret = 0;
1558                         break;
1559                 }
1560         }
1561
1562         closedir(d);
1563
1564         return ret;
1565 }
1566
1567 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1568 {
1569         u8 host_build_id[BUILD_ID_SIZE];
1570         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1571         bool is_host = false;
1572         char path[PATH_MAX];
1573
1574         if (!dso->has_build_id) {
1575                 /*
1576                  * Last resort, if we don't have a build-id and couldn't find
1577                  * any vmlinux file, try the running kernel kallsyms table.
1578                  */
1579                 goto proc_kallsyms;
1580         }
1581
1582         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1583                                  sizeof(host_build_id)) == 0)
1584                 is_host = dso__build_id_equal(dso, host_build_id);
1585
1586         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1587
1588         scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1589                   sbuild_id);
1590
1591         /* Use /proc/kallsyms if possible */
1592         if (is_host) {
1593                 DIR *d;
1594                 int fd;
1595
1596                 /* If no cached kcore go with /proc/kallsyms */
1597                 d = opendir(path);
1598                 if (!d)
1599                         goto proc_kallsyms;
1600                 closedir(d);
1601
1602                 /*
1603                  * Do not check the build-id cache, until we know we cannot use
1604                  * /proc/kcore.
1605                  */
1606                 fd = open("/proc/kcore", O_RDONLY);
1607                 if (fd != -1) {
1608                         close(fd);
1609                         /* If module maps match go with /proc/kallsyms */
1610                         if (!validate_kcore_addresses("/proc/kallsyms", map))
1611                                 goto proc_kallsyms;
1612                 }
1613
1614                 /* Find kallsyms in build-id cache with kcore */
1615                 if (!find_matching_kcore(map, path, sizeof(path)))
1616                         return strdup(path);
1617
1618                 goto proc_kallsyms;
1619         }
1620
1621         /* Find kallsyms in build-id cache with kcore */
1622         if (!find_matching_kcore(map, path, sizeof(path)))
1623                 return strdup(path);
1624
1625         scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1626                   buildid_dir, sbuild_id);
1627
1628         if (access(path, F_OK)) {
1629                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1630                        sbuild_id);
1631                 return NULL;
1632         }
1633
1634         return strdup(path);
1635
1636 proc_kallsyms:
1637         return strdup("/proc/kallsyms");
1638 }
1639
1640 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1641                                 symbol_filter_t filter)
1642 {
1643         int err;
1644         const char *kallsyms_filename = NULL;
1645         char *kallsyms_allocated_filename = NULL;
1646         /*
1647          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1648          * it and only it, reporting errors to the user if it cannot be used.
1649          *
1650          * For instance, try to analyse an ARM perf.data file _without_ a
1651          * build-id, or if the user specifies the wrong path to the right
1652          * vmlinux file, obviously we can't fallback to another vmlinux (a
1653          * x86_86 one, on the machine where analysis is being performed, say),
1654          * or worse, /proc/kallsyms.
1655          *
1656          * If the specified file _has_ a build-id and there is a build-id
1657          * section in the perf.data file, we will still do the expected
1658          * validation in dso__load_vmlinux and will bail out if they don't
1659          * match.
1660          */
1661         if (symbol_conf.kallsyms_name != NULL) {
1662                 kallsyms_filename = symbol_conf.kallsyms_name;
1663                 goto do_kallsyms;
1664         }
1665
1666         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1667                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1668                                          false, filter);
1669         }
1670
1671         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1672                 err = dso__load_vmlinux_path(dso, map, filter);
1673                 if (err > 0)
1674                         return err;
1675         }
1676
1677         /* do not try local files if a symfs was given */
1678         if (symbol_conf.symfs[0] != 0)
1679                 return -1;
1680
1681         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1682         if (!kallsyms_allocated_filename)
1683                 return -1;
1684
1685         kallsyms_filename = kallsyms_allocated_filename;
1686
1687 do_kallsyms:
1688         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1689         if (err > 0)
1690                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1691         free(kallsyms_allocated_filename);
1692
1693         if (err > 0 && !dso__is_kcore(dso)) {
1694                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1695                 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1696                 map__fixup_start(map);
1697                 map__fixup_end(map);
1698         }
1699
1700         return err;
1701 }
1702
1703 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1704                                       symbol_filter_t filter)
1705 {
1706         int err;
1707         const char *kallsyms_filename = NULL;
1708         struct machine *machine;
1709         char path[PATH_MAX];
1710
1711         if (!map->groups) {
1712                 pr_debug("Guest kernel map hasn't the point to groups\n");
1713                 return -1;
1714         }
1715         machine = map->groups->machine;
1716
1717         if (machine__is_default_guest(machine)) {
1718                 /*
1719                  * if the user specified a vmlinux filename, use it and only
1720                  * it, reporting errors to the user if it cannot be used.
1721                  * Or use file guest_kallsyms inputted by user on commandline
1722                  */
1723                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1724                         err = dso__load_vmlinux(dso, map,
1725                                                 symbol_conf.default_guest_vmlinux_name,
1726                                                 false, filter);
1727                         return err;
1728                 }
1729
1730                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1731                 if (!kallsyms_filename)
1732                         return -1;
1733         } else {
1734                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1735                 kallsyms_filename = path;
1736         }
1737
1738         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1739         if (err > 0)
1740                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1741         if (err > 0 && !dso__is_kcore(dso)) {
1742                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1743                 machine__mmap_name(machine, path, sizeof(path));
1744                 dso__set_long_name(dso, strdup(path), true);
1745                 map__fixup_start(map);
1746                 map__fixup_end(map);
1747         }
1748
1749         return err;
1750 }
1751
1752 static void vmlinux_path__exit(void)
1753 {
1754         while (--vmlinux_path__nr_entries >= 0)
1755                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1756
1757         zfree(&vmlinux_path);
1758 }
1759
1760 static int vmlinux_path__init(struct perf_session_env *env)
1761 {
1762         struct utsname uts;
1763         char bf[PATH_MAX];
1764         char *kernel_version;
1765
1766         vmlinux_path = malloc(sizeof(char *) * 6);
1767         if (vmlinux_path == NULL)
1768                 return -1;
1769
1770         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1771         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1772                 goto out_fail;
1773         ++vmlinux_path__nr_entries;
1774         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1775         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1776                 goto out_fail;
1777         ++vmlinux_path__nr_entries;
1778
1779         /* only try kernel version if no symfs was given */
1780         if (symbol_conf.symfs[0] != 0)
1781                 return 0;
1782
1783         if (env) {
1784                 kernel_version = env->os_release;
1785         } else {
1786                 if (uname(&uts) < 0)
1787                         goto out_fail;
1788
1789                 kernel_version = uts.release;
1790         }
1791
1792         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", 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), "/usr/lib/debug/boot/vmlinux-%s",
1798                  kernel_version);
1799         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1800         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1801                 goto out_fail;
1802         ++vmlinux_path__nr_entries;
1803         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", 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         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1809                  kernel_version);
1810         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1811         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1812                 goto out_fail;
1813         ++vmlinux_path__nr_entries;
1814
1815         return 0;
1816
1817 out_fail:
1818         vmlinux_path__exit();
1819         return -1;
1820 }
1821
1822 int setup_list(struct strlist **list, const char *list_str,
1823                       const char *list_name)
1824 {
1825         if (list_str == NULL)
1826                 return 0;
1827
1828         *list = strlist__new(true, list_str);
1829         if (!*list) {
1830                 pr_err("problems parsing %s list\n", list_name);
1831                 return -1;
1832         }
1833         return 0;
1834 }
1835
1836 static bool symbol__read_kptr_restrict(void)
1837 {
1838         bool value = false;
1839
1840         if (geteuid() != 0) {
1841                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1842                 if (fp != NULL) {
1843                         char line[8];
1844
1845                         if (fgets(line, sizeof(line), fp) != NULL)
1846                                 value = atoi(line) != 0;
1847
1848                         fclose(fp);
1849                 }
1850         }
1851
1852         return value;
1853 }
1854
1855 int symbol__init(struct perf_session_env *env)
1856 {
1857         const char *symfs;
1858
1859         if (symbol_conf.initialized)
1860                 return 0;
1861
1862         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1863
1864         symbol__elf_init();
1865
1866         if (symbol_conf.sort_by_name)
1867                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1868                                           sizeof(struct symbol));
1869
1870         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1871                 return -1;
1872
1873         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1874                 pr_err("'.' is the only non valid --field-separator argument\n");
1875                 return -1;
1876         }
1877
1878         if (setup_list(&symbol_conf.dso_list,
1879                        symbol_conf.dso_list_str, "dso") < 0)
1880                 return -1;
1881
1882         if (setup_list(&symbol_conf.comm_list,
1883                        symbol_conf.comm_list_str, "comm") < 0)
1884                 goto out_free_dso_list;
1885
1886         if (setup_list(&symbol_conf.sym_list,
1887                        symbol_conf.sym_list_str, "symbol") < 0)
1888                 goto out_free_comm_list;
1889
1890         /*
1891          * A path to symbols of "/" is identical to ""
1892          * reset here for simplicity.
1893          */
1894         symfs = realpath(symbol_conf.symfs, NULL);
1895         if (symfs == NULL)
1896                 symfs = symbol_conf.symfs;
1897         if (strcmp(symfs, "/") == 0)
1898                 symbol_conf.symfs = "";
1899         if (symfs != symbol_conf.symfs)
1900                 free((void *)symfs);
1901
1902         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1903
1904         symbol_conf.initialized = true;
1905         return 0;
1906
1907 out_free_comm_list:
1908         strlist__delete(symbol_conf.comm_list);
1909 out_free_dso_list:
1910         strlist__delete(symbol_conf.dso_list);
1911         return -1;
1912 }
1913
1914 void symbol__exit(void)
1915 {
1916         if (!symbol_conf.initialized)
1917                 return;
1918         strlist__delete(symbol_conf.sym_list);
1919         strlist__delete(symbol_conf.dso_list);
1920         strlist__delete(symbol_conf.comm_list);
1921         vmlinux_path__exit();
1922         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1923         symbol_conf.initialized = false;
1924 }