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         struct symbol_name_rb_node *s;
 400
 401         if (symbols == NULL)
 402                 return NULL;
 403
 404         n = symbols->rb_node;
 405
 406         while (n) {
 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                         break;
 418         }
 419
 420         if (n == NULL)
 421                 return NULL;
 422
 423         /* return first symbol that has same name (if any) */
 424         for (n = rb_prev(n); n; n = rb_prev(n)) {
 425                 struct symbol_name_rb_node *tmp;
 426
 427                 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
 428                 if (strcmp(tmp->sym.name, s->sym.name))
 429                         break;
 430
 431                 s = tmp;
 432         }
 433
 434         return &s->sym;
 435 }
 436
 437 struct symbol *dso__find_symbol(struct dso *dso,
 438                                 enum map_type type, u64 addr)
 439 {
 440         return symbols__find(&dso->symbols[type], addr);
 441 }
 442
 443 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 444 {
 445         return symbols__first(&dso->symbols[type]);
 446 }
 447
 448 struct symbol *dso__next_symbol(struct symbol *sym)
 449 {
 450         return symbols__next(sym);
 451 }
 452
 453 struct symbol *symbol__next_by_name(struct symbol *sym)
 454 {
 455         struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
 456         struct rb_node *n = rb_next(&s->rb_node);
 457
 458         return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
 459 }
 460
 461  /*
 462   * Teturns first symbol that matched with @name.
 463   */
 464 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 465                                         const char *name)
 466 {
 467         return symbols__find_by_name(&dso->symbol_names[type], name);
 468 }
 469
 470 void dso__sort_by_name(struct dso *dso, enum map_type type)
 471 {
 472         dso__set_sorted_by_name(dso, type);
 473         return symbols__sort_by_name(&dso->symbol_names[type],
 474                                      &dso->symbols[type]);
 475 }
 476
 477 size_t dso__fprintf_symbols_by_name(struct dso *dso,
 478                                     enum map_type type, FILE *fp)
 479 {
 480         size_t ret = 0;
 481         struct rb_node *nd;
 482         struct symbol_name_rb_node *pos;
 483
 484         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
 485                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 486                 fprintf(fp, "%s\n", pos->sym.name);
 487         }
 488
 489         return ret;
 490 }
 491
 492 int modules__parse(const char *filename, void *arg,
 493                    int (*process_module)(void *arg, const char *name,
 494                                          u64 start))
 495 {
 496         char *line = NULL;
 497         size_t n;
 498         FILE *file;
 499         int err = 0;
 500
 501         file = fopen(filename, "r");
 502         if (file == NULL)
 503                 return -1;
 504
 505         while (1) {
 506                 char name[PATH_MAX];
 507                 u64 start;
 508                 char *sep;
 509                 ssize_t line_len;
 510
 511                 line_len = getline(&line, &n, file);
 512                 if (line_len < 0) {
 513                         if (feof(file))
 514                                 break;
 515                         err = -1;
 516                         goto out;
 517                 }
 518
 519                 if (!line) {
 520                         err = -1;
 521                         goto out;
 522                 }
 523
 524                 line[--line_len] = '\0'; /* \n */
 525
 526                 sep = strrchr(line, 'x');
 527                 if (sep == NULL)
 528                         continue;
 529
 530                 hex2u64(sep + 1, &start);
 531
 532                 sep = strchr(line, ' ');
 533                 if (sep == NULL)
 534                         continue;
 535
 536                 *sep = '\0';
 537
 538                 scnprintf(name, sizeof(name), "[%s]", line);
 539
 540                 err = process_module(arg, name, start);
 541                 if (err)
 542                         break;
 543         }
 544 out:
 545         free(line);
 546         fclose(file);
 547         return err;
 548 }
 549
 550 struct process_kallsyms_args {
 551         struct map *map;
 552         struct dso *dso;
 553 };
 554
 555 /*
 556  * These are symbols in the kernel image, so make sure that
 557  * sym is from a kernel DSO.
 558  */
 559 bool symbol__is_idle(struct symbol *sym)
 560 {
 561         const char * const idle_symbols[] = {
 562                 "cpu_idle",
 563                 "cpu_startup_entry",
 564                 "intel_idle",
 565                 "default_idle",
 566                 "native_safe_halt",
 567                 "enter_idle",
 568                 "exit_idle",
 569                 "mwait_idle",
 570                 "mwait_idle_with_hints",
 571                 "poll_idle",
 572                 "ppc64_runlatch_off",
 573                 "pseries_dedicated_idle_sleep",
 574                 NULL
 575         };
 576
 577         int i;
 578
 579         if (!sym)
 580                 return false;
 581
 582         for (i = 0; idle_symbols[i]; i++) {
 583                 if (!strcmp(idle_symbols[i], sym->name))
 584                         return true;
 585         }
 586
 587         return false;
 588 }
 589
 590 static int map__process_kallsym_symbol(void *arg, const char *name,
 591                                        char type, u64 start)
 592 {
 593         struct symbol *sym;
 594         struct process_kallsyms_args *a = arg;
 595         struct rb_root *root = &a->dso->symbols[a->map->type];
 596
 597         if (!symbol_type__is_a(type, a->map->type))
 598                 return 0;
 599
 600         /*
 601          * module symbols are not sorted so we add all
 602          * symbols, setting length to 0, and rely on
 603          * symbols__fixup_end() to fix it up.
 604          */
 605         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
 606         if (sym == NULL)
 607                 return -ENOMEM;
 608         /*
 609          * We will pass the symbols to the filter later, in
 610          * map__split_kallsyms, when we have split the maps per module
 611          */
 612         symbols__insert(root, sym);
 613
 614         return 0;
 615 }
 616
 617 /*
 618  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 619  * so that we can in the next step set the symbol ->end address and then
 620  * call kernel_maps__split_kallsyms.
 621  */
 622 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 623                                   struct map *map)
 624 {
 625         struct process_kallsyms_args args = { .map = map, .dso = dso, };
 626         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 627 }
 628
 629 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
 630                                          symbol_filter_t filter)
 631 {
 632         struct map_groups *kmaps = map__kmap(map)->kmaps;
 633         struct map *curr_map;
 634         struct symbol *pos;
 635         int count = 0, moved = 0;
 636         struct rb_root *root = &dso->symbols[map->type];
 637         struct rb_node *next = rb_first(root);
 638
 639         while (next) {
 640                 char *module;
 641
 642                 pos = rb_entry(next, struct symbol, rb_node);
 643                 next = rb_next(&pos->rb_node);
 644
 645                 module = strchr(pos->name, '\t');
 646                 if (module)
 647                         *module = '\0';
 648
 649                 curr_map = map_groups__find(kmaps, map->type, pos->start);
 650
 651                 if (!curr_map || (filter && filter(curr_map, pos))) {
 652                         rb_erase(&pos->rb_node, root);
 653                         symbol__delete(pos);
 654                 } else {
 655                         pos->start -= curr_map->start - curr_map->pgoff;
 656                         if (pos->end)
 657                                 pos->end -= curr_map->start - curr_map->pgoff;
 658                         if (curr_map != map) {
 659                                 rb_erase(&pos->rb_node, root);
 660                                 symbols__insert(
 661                                         &curr_map->dso->symbols[curr_map->type],
 662                                         pos);
 663                                 ++moved;
 664                         } else {
 665                                 ++count;
 666                         }
 667                 }
 668         }
 669
 670         /* Symbols have been adjusted */
 671         dso->adjust_symbols = 1;
 672
 673         return count + moved;
 674 }
 675
 676 /*
 677  * Split the symbols into maps, making sure there are no overlaps, i.e. the
 678  * kernel range is broken in several maps, named [kernel].N, as we don't have
 679  * the original ELF section names vmlinux have.
 680  */
 681 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
 682                                symbol_filter_t filter)
 683 {
 684         struct map_groups *kmaps = map__kmap(map)->kmaps;
 685         struct machine *machine = kmaps->machine;
 686         struct map *curr_map = map;
 687         struct symbol *pos;
 688         int count = 0, moved = 0;
 689         struct rb_root *root = &dso->symbols[map->type];
 690         struct rb_node *next = rb_first(root);
 691         int kernel_range = 0;
 692
 693         while (next) {
 694                 char *module;
 695
 696                 pos = rb_entry(next, struct symbol, rb_node);
 697                 next = rb_next(&pos->rb_node);
 698
 699                 module = strchr(pos->name, '\t');
 700                 if (module) {
 701                         if (!symbol_conf.use_modules)
 702                                 goto discard_symbol;
 703
 704                         *module++ = '\0';
 705
 706                         if (strcmp(curr_map->dso->short_name, module)) {
 707                                 if (curr_map != map &&
 708                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 709                                     machine__is_default_guest(machine)) {
 710                                         /*
 711                                          * We assume all symbols of a module are
 712                                          * continuous in * kallsyms, so curr_map
 713                                          * points to a module and all its
 714                                          * symbols are in its kmap. Mark it as
 715                                          * loaded.
 716                                          */
 717                                         dso__set_loaded(curr_map->dso,
 718                                                         curr_map->type);
 719                                 }
 720
 721                                 curr_map = map_groups__find_by_name(kmaps,
 722                                                         map->type, module);
 723                                 if (curr_map == NULL) {
 724                                         pr_debug("%s/proc/{kallsyms,modules} "
 725                                                  "inconsistency while looking "
 726                                                  "for \"%s\" module!\n",
 727                                                  machine->root_dir, module);
 728                                         curr_map = map;
 729                                         goto discard_symbol;
 730                                 }
 731
 732                                 if (curr_map->dso->loaded &&
 733                                     !machine__is_default_guest(machine))
 734                                         goto discard_symbol;
 735                         }
 736                         /*
 737                          * So that we look just like we get from .ko files,
 738                          * i.e. not prelinked, relative to map->start.
 739                          */
 740                         pos->start = curr_map->map_ip(curr_map, pos->start);
 741                         pos->end   = curr_map->map_ip(curr_map, pos->end);
 742                 } else if (curr_map != map) {
 743                         char dso_name[PATH_MAX];
 744                         struct dso *ndso;
 745
 746                         if (delta) {
 747                                 /* Kernel was relocated at boot time */
 748                                 pos->start -= delta;
 749                                 pos->end -= delta;
 750                         }
 751
 752                         if (count == 0) {
 753                                 curr_map = map;
 754                                 goto filter_symbol;
 755                         }
 756
 757                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 758                                 snprintf(dso_name, sizeof(dso_name),
 759                                         "[guest.kernel].%d",
 760                                         kernel_range++);
 761                         else
 762                                 snprintf(dso_name, sizeof(dso_name),
 763                                         "[kernel].%d",
 764                                         kernel_range++);
 765
 766                         ndso = dso__new(dso_name);
 767                         if (ndso == NULL)
 768                                 return -1;
 769
 770                         ndso->kernel = dso->kernel;
 771
 772                         curr_map = map__new2(pos->start, ndso, map->type);
 773                         if (curr_map == NULL) {
 774                                 dso__delete(ndso);
 775                                 return -1;
 776                         }
 777
 778                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 779                         map_groups__insert(kmaps, curr_map);
 780                         ++kernel_range;
 781                 } else if (delta) {
 782                         /* Kernel was relocated at boot time */
 783                         pos->start -= delta;
 784                         pos->end -= delta;
 785                 }
 786 filter_symbol:
 787                 if (filter && filter(curr_map, pos)) {
 788 discard_symbol:         rb_erase(&pos->rb_node, root);
 789                         symbol__delete(pos);
 790                 } else {
 791                         if (curr_map != map) {
 792                                 rb_erase(&pos->rb_node, root);
 793                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 794                                 ++moved;
 795                         } else
 796                                 ++count;
 797                 }
 798         }
 799
 800         if (curr_map != map &&
 801             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 802             machine__is_default_guest(kmaps->machine)) {
 803                 dso__set_loaded(curr_map->dso, curr_map->type);
 804         }
 805
 806         return count + moved;
 807 }
 808
 809 bool symbol__restricted_filename(const char *filename,
 810                                  const char *restricted_filename)
 811 {
 812         bool restricted = false;
 813
 814         if (symbol_conf.kptr_restrict) {
 815                 char *r = realpath(filename, NULL);
 816
 817                 if (r != NULL) {
 818                         restricted = strcmp(r, restricted_filename) == 0;
 819                         free(r);
 820                         return restricted;
 821                 }
 822         }
 823
 824         return restricted;
 825 }
 826
 827 struct module_info {
 828         struct rb_node rb_node;
 829         char *name;
 830         u64 start;
 831 };
 832
 833 static void add_module(struct module_info *mi, struct rb_root *modules)
 834 {
 835         struct rb_node **p = &modules->rb_node;
 836         struct rb_node *parent = NULL;
 837         struct module_info *m;
 838
 839         while (*p != NULL) {
 840                 parent = *p;
 841                 m = rb_entry(parent, struct module_info, rb_node);
 842                 if (strcmp(mi->name, m->name) < 0)
 843                         p = &(*p)->rb_left;
 844                 else
 845                         p = &(*p)->rb_right;
 846         }
 847         rb_link_node(&mi->rb_node, parent, p);
 848         rb_insert_color(&mi->rb_node, modules);
 849 }
 850
 851 static void delete_modules(struct rb_root *modules)
 852 {
 853         struct module_info *mi;
 854         struct rb_node *next = rb_first(modules);
 855
 856         while (next) {
 857                 mi = rb_entry(next, struct module_info, rb_node);
 858                 next = rb_next(&mi->rb_node);
 859                 rb_erase(&mi->rb_node, modules);
 860                 zfree(&mi->name);
 861                 free(mi);
 862         }
 863 }
 864
 865 static struct module_info *find_module(const char *name,
 866                                        struct rb_root *modules)
 867 {
 868         struct rb_node *n = modules->rb_node;
 869
 870         while (n) {
 871                 struct module_info *m;
 872                 int cmp;
 873
 874                 m = rb_entry(n, struct module_info, rb_node);
 875                 cmp = strcmp(name, m->name);
 876                 if (cmp < 0)
 877                         n = n->rb_left;
 878                 else if (cmp > 0)
 879                         n = n->rb_right;
 880                 else
 881                         return m;
 882         }
 883
 884         return NULL;
 885 }
 886
 887 static int __read_proc_modules(void *arg, const char *name, u64 start)
 888 {
 889         struct rb_root *modules = arg;
 890         struct module_info *mi;
 891
 892         mi = zalloc(sizeof(struct module_info));
 893         if (!mi)
 894                 return -ENOMEM;
 895
 896         mi->name = strdup(name);
 897         mi->start = start;
 898
 899         if (!mi->name) {
 900                 free(mi);
 901                 return -ENOMEM;
 902         }
 903
 904         add_module(mi, modules);
 905
 906         return 0;
 907 }
 908
 909 static int read_proc_modules(const char *filename, struct rb_root *modules)
 910 {
 911         if (symbol__restricted_filename(filename, "/proc/modules"))
 912                 return -1;
 913
 914         if (modules__parse(filename, modules, __read_proc_modules)) {
 915                 delete_modules(modules);
 916                 return -1;
 917         }
 918
 919         return 0;
 920 }
 921
 922 int compare_proc_modules(const char *from, const char *to)
 923 {
 924         struct rb_root from_modules = RB_ROOT;
 925         struct rb_root to_modules = RB_ROOT;
 926         struct rb_node *from_node, *to_node;
 927         struct module_info *from_m, *to_m;
 928         int ret = -1;
 929
 930         if (read_proc_modules(from, &from_modules))
 931                 return -1;
 932
 933         if (read_proc_modules(to, &to_modules))
 934                 goto out_delete_from;
 935
 936         from_node = rb_first(&from_modules);
 937         to_node = rb_first(&to_modules);
 938         while (from_node) {
 939                 if (!to_node)
 940                         break;
 941
 942                 from_m = rb_entry(from_node, struct module_info, rb_node);
 943                 to_m = rb_entry(to_node, struct module_info, rb_node);
 944
 945                 if (from_m->start != to_m->start ||
 946                     strcmp(from_m->name, to_m->name))
 947                         break;
 948
 949                 from_node = rb_next(from_node);
 950                 to_node = rb_next(to_node);
 951         }
 952
 953         if (!from_node && !to_node)
 954                 ret = 0;
 955
 956         delete_modules(&to_modules);
 957 out_delete_from:
 958         delete_modules(&from_modules);
 959
 960         return ret;
 961 }
 962
 963 static int do_validate_kcore_modules(const char *filename, struct map *map,
 964                                   struct map_groups *kmaps)
 965 {
 966         struct rb_root modules = RB_ROOT;
 967         struct map *old_map;
 968         int err;
 969
 970         err = read_proc_modules(filename, &modules);
 971         if (err)
 972                 return err;
 973
 974         old_map = map_groups__first(kmaps, map->type);
 975         while (old_map) {
 976                 struct map *next = map_groups__next(old_map);
 977                 struct module_info *mi;
 978
 979                 if (old_map == map || old_map->start == map->start) {
 980                         /* The kernel map */
 981                         old_map = next;
 982                         continue;
 983                 }
 984
 985                 /* Module must be in memory at the same address */
 986                 mi = find_module(old_map->dso->short_name, &modules);
 987                 if (!mi || mi->start != old_map->start) {
 988                         err = -EINVAL;
 989                         goto out;
 990                 }
 991
 992                 old_map = next;
 993         }
 994 out:
 995         delete_modules(&modules);
 996         return err;
 997 }
 998
 999 /*
1000  * If kallsyms is referenced by name then we look for filename in the same
1001  * directory.
1002  */
1003 static bool filename_from_kallsyms_filename(char *filename,
1004                                             const char *base_name,
1005                                             const char *kallsyms_filename)
1006 {
1007         char *name;
1008
1009         strcpy(filename, kallsyms_filename);
1010         name = strrchr(filename, '/');
1011         if (!name)
1012                 return false;
1013
1014         name += 1;
1015
1016         if (!strcmp(name, "kallsyms")) {
1017                 strcpy(name, base_name);
1018                 return true;
1019         }
1020
1021         return false;
1022 }
1023
1024 static int validate_kcore_modules(const char *kallsyms_filename,
1025                                   struct map *map)
1026 {
1027         struct map_groups *kmaps = map__kmap(map)->kmaps;
1028         char modules_filename[PATH_MAX];
1029
1030         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1031                                              kallsyms_filename))
1032                 return -EINVAL;
1033
1034         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1035                 return -EINVAL;
1036
1037         return 0;
1038 }
1039
1040 static int validate_kcore_addresses(const char *kallsyms_filename,
1041                                     struct map *map)
1042 {
1043         struct kmap *kmap = map__kmap(map);
1044
1045         if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1046                 u64 start;
1047
1048                 start = kallsyms__get_function_start(kallsyms_filename,
1049                                                      kmap->ref_reloc_sym->name);
1050                 if (start != kmap->ref_reloc_sym->addr)
1051                         return -EINVAL;
1052         }
1053
1054         return validate_kcore_modules(kallsyms_filename, map);
1055 }
1056
1057 struct kcore_mapfn_data {
1058         struct dso *dso;
1059         enum map_type type;
1060         struct list_head maps;
1061 };
1062
1063 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1064 {
1065         struct kcore_mapfn_data *md = data;
1066         struct map *map;
1067
1068         map = map__new2(start, md->dso, md->type);
1069         if (map == NULL)
1070                 return -ENOMEM;
1071
1072         map->end = map->start + len;
1073         map->pgoff = pgoff;
1074
1075         list_add(&map->node, &md->maps);
1076
1077         return 0;
1078 }
1079
1080 static int dso__load_kcore(struct dso *dso, struct map *map,
1081                            const char *kallsyms_filename)
1082 {
1083         struct map_groups *kmaps = map__kmap(map)->kmaps;
1084         struct machine *machine = kmaps->machine;
1085         struct kcore_mapfn_data md;
1086         struct map *old_map, *new_map, *replacement_map = NULL;
1087         bool is_64_bit;
1088         int err, fd;
1089         char kcore_filename[PATH_MAX];
1090         struct symbol *sym;
1091
1092         /* This function requires that the map is the kernel map */
1093         if (map != machine->vmlinux_maps[map->type])
1094                 return -EINVAL;
1095
1096         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1097                                              kallsyms_filename))
1098                 return -EINVAL;
1099
1100         /* Modules and kernel must be present at their original addresses */
1101         if (validate_kcore_addresses(kallsyms_filename, map))
1102                 return -EINVAL;
1103
1104         md.dso = dso;
1105         md.type = map->type;
1106         INIT_LIST_HEAD(&md.maps);
1107
1108         fd = open(kcore_filename, O_RDONLY);
1109         if (fd < 0)
1110                 return -EINVAL;
1111
1112         /* Read new maps into temporary lists */
1113         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1114                               &is_64_bit);
1115         if (err)
1116                 goto out_err;
1117         dso->is_64_bit = is_64_bit;
1118
1119         if (list_empty(&md.maps)) {
1120                 err = -EINVAL;
1121                 goto out_err;
1122         }
1123
1124         /* Remove old maps */
1125         old_map = map_groups__first(kmaps, map->type);
1126         while (old_map) {
1127                 struct map *next = map_groups__next(old_map);
1128
1129                 if (old_map != map)
1130                         map_groups__remove(kmaps, old_map);
1131                 old_map = next;
1132         }
1133
1134         /* Find the kernel map using the first symbol */
1135         sym = dso__first_symbol(dso, map->type);
1136         list_for_each_entry(new_map, &md.maps, node) {
1137                 if (sym && sym->start >= new_map->start &&
1138                     sym->start < new_map->end) {
1139                         replacement_map = new_map;
1140                         break;
1141                 }
1142         }
1143
1144         if (!replacement_map)
1145                 replacement_map = list_entry(md.maps.next, struct map, node);
1146
1147         /* Add new maps */
1148         while (!list_empty(&md.maps)) {
1149                 new_map = list_entry(md.maps.next, struct map, node);
1150                 list_del(&new_map->node);
1151                 if (new_map == replacement_map) {
1152                         map->start      = new_map->start;
1153                         map->end        = new_map->end;
1154                         map->pgoff      = new_map->pgoff;
1155                         map->map_ip     = new_map->map_ip;
1156                         map->unmap_ip   = new_map->unmap_ip;
1157                         map__delete(new_map);
1158                         /* Ensure maps are correctly ordered */
1159                         map_groups__remove(kmaps, map);
1160                         map_groups__insert(kmaps, map);
1161                 } else {
1162                         map_groups__insert(kmaps, new_map);
1163                 }
1164         }
1165
1166         /*
1167          * Set the data type and long name so that kcore can be read via
1168          * dso__data_read_addr().
1169          */
1170         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1171                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1172         else
1173                 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1174         dso__set_long_name(dso, strdup(kcore_filename), true);
1175
1176         close(fd);
1177
1178         if (map->type == MAP__FUNCTION)
1179                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1180         else
1181                 pr_debug("Using %s for kernel data\n", kcore_filename);
1182
1183         return 0;
1184
1185 out_err:
1186         while (!list_empty(&md.maps)) {
1187                 map = list_entry(md.maps.next, struct map, node);
1188                 list_del(&map->node);
1189                 map__delete(map);
1190         }
1191         close(fd);
1192         return -EINVAL;
1193 }
1194
1195 /*
1196  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1197  * delta based on the relocation reference symbol.
1198  */
1199 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1200 {
1201         struct kmap *kmap = map__kmap(map);
1202         u64 addr;
1203
1204         if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1205                 return 0;
1206
1207         addr = kallsyms__get_function_start(filename,
1208                                             kmap->ref_reloc_sym->name);
1209         if (!addr)
1210                 return -1;
1211
1212         *delta = addr - kmap->ref_reloc_sym->addr;
1213         return 0;
1214 }
1215
1216 int dso__load_kallsyms(struct dso *dso, const char *filename,
1217                        struct map *map, symbol_filter_t filter)
1218 {
1219         u64 delta = 0;
1220
1221         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1222                 return -1;
1223
1224         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1225                 return -1;
1226
1227         if (kallsyms__delta(map, filename, &delta))
1228                 return -1;
1229
1230         symbols__fixup_duplicate(&dso->symbols[map->type]);
1231         symbols__fixup_end(&dso->symbols[map->type]);
1232
1233         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1234                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1235         else
1236                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1237
1238         if (!dso__load_kcore(dso, map, filename))
1239                 return dso__split_kallsyms_for_kcore(dso, map, filter);
1240         else
1241                 return dso__split_kallsyms(dso, map, delta, filter);
1242 }
1243
1244 static int dso__load_perf_map(struct dso *dso, struct map *map,
1245                               symbol_filter_t filter)
1246 {
1247         char *line = NULL;
1248         size_t n;
1249         FILE *file;
1250         int nr_syms = 0;
1251
1252         file = fopen(dso->long_name, "r");
1253         if (file == NULL)
1254                 goto out_failure;
1255
1256         while (!feof(file)) {
1257                 u64 start, size;
1258                 struct symbol *sym;
1259                 int line_len, len;
1260
1261                 line_len = getline(&line, &n, file);
1262                 if (line_len < 0)
1263                         break;
1264
1265                 if (!line)
1266                         goto out_failure;
1267
1268                 line[--line_len] = '\0'; /* \n */
1269
1270                 len = hex2u64(line, &start);
1271
1272                 len++;
1273                 if (len + 2 >= line_len)
1274                         continue;
1275
1276                 len += hex2u64(line + len, &size);
1277
1278                 len++;
1279                 if (len + 2 >= line_len)
1280                         continue;
1281
1282                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1283
1284                 if (sym == NULL)
1285                         goto out_delete_line;
1286
1287                 if (filter && filter(map, sym))
1288                         symbol__delete(sym);
1289                 else {
1290                         symbols__insert(&dso->symbols[map->type], sym);
1291                         nr_syms++;
1292                 }
1293         }
1294
1295         free(line);
1296         fclose(file);
1297
1298         return nr_syms;
1299
1300 out_delete_line:
1301         free(line);
1302 out_failure:
1303         return -1;
1304 }
1305
1306 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1307                                            enum dso_binary_type type)
1308 {
1309         switch (type) {
1310         case DSO_BINARY_TYPE__JAVA_JIT:
1311         case DSO_BINARY_TYPE__DEBUGLINK:
1312         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1313         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1314         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1315         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1316         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1317                 return !kmod && dso->kernel == DSO_TYPE_USER;
1318
1319         case DSO_BINARY_TYPE__KALLSYMS:
1320         case DSO_BINARY_TYPE__VMLINUX:
1321         case DSO_BINARY_TYPE__KCORE:
1322                 return dso->kernel == DSO_TYPE_KERNEL;
1323
1324         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1325         case DSO_BINARY_TYPE__GUEST_VMLINUX:
1326         case DSO_BINARY_TYPE__GUEST_KCORE:
1327                 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1328
1329         case DSO_BINARY_TYPE__GUEST_KMODULE:
1330         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1331         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1332         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1333                 /*
1334                  * kernel modules know their symtab type - it's set when
1335                  * creating a module dso in machine__new_module().
1336                  */
1337                 return kmod && dso->symtab_type == type;
1338
1339         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1340                 return true;
1341
1342         case DSO_BINARY_TYPE__NOT_FOUND:
1343         default:
1344                 return false;
1345         }
1346 }
1347
1348 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1349 {
1350         char *name;
1351         int ret = -1;
1352         u_int i;
1353         struct machine *machine;
1354         char *root_dir = (char *) "";
1355         int ss_pos = 0;
1356         struct symsrc ss_[2];
1357         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1358         bool kmod;
1359
1360         dso__set_loaded(dso, map->type);
1361
1362         if (dso->kernel == DSO_TYPE_KERNEL)
1363                 return dso__load_kernel_sym(dso, map, filter);
1364         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1365                 return dso__load_guest_kernel_sym(dso, map, filter);
1366
1367         if (map->groups && map->groups->machine)
1368                 machine = map->groups->machine;
1369         else
1370                 machine = NULL;
1371
1372         dso->adjust_symbols = 0;
1373
1374         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1375                 struct stat st;
1376
1377                 if (lstat(dso->name, &st) < 0)
1378                         return -1;
1379
1380                 if (st.st_uid && (st.st_uid != geteuid())) {
1381                         pr_warning("File %s not owned by current user or root, "
1382                                 "ignoring it.\n", dso->name);
1383                         return -1;
1384                 }
1385
1386                 ret = dso__load_perf_map(dso, map, filter);
1387                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1388                                              DSO_BINARY_TYPE__NOT_FOUND;
1389                 return ret;
1390         }
1391
1392         if (machine)
1393                 root_dir = machine->root_dir;
1394
1395         name = malloc(PATH_MAX);
1396         if (!name)
1397                 return -1;
1398
1399         kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1400                 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1401                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1402                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1403
1404         /*
1405          * Iterate over candidate debug images.
1406          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1407          * and/or opd section) for processing.
1408          */
1409         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1410                 struct symsrc *ss = &ss_[ss_pos];
1411                 bool next_slot = false;
1412
1413                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1414
1415                 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1416                         continue;
1417
1418                 if (dso__read_binary_type_filename(dso, symtab_type,
1419                                                    root_dir, name, PATH_MAX))
1420                         continue;
1421
1422                 /* Name is now the name of the next image to try */
1423                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1424                         continue;
1425
1426                 if (!syms_ss && symsrc__has_symtab(ss)) {
1427                         syms_ss = ss;
1428                         next_slot = true;
1429                         if (!dso->symsrc_filename)
1430                                 dso->symsrc_filename = strdup(name);
1431                 }
1432
1433                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1434                         runtime_ss = ss;
1435                         next_slot = true;
1436                 }
1437
1438                 if (next_slot) {
1439                         ss_pos++;
1440
1441                         if (syms_ss && runtime_ss)
1442                                 break;
1443                 } else {
1444                         symsrc__destroy(ss);
1445                 }
1446
1447         }
1448
1449         if (!runtime_ss && !syms_ss)
1450                 goto out_free;
1451
1452         if (runtime_ss && !syms_ss) {
1453                 syms_ss = runtime_ss;
1454         }
1455
1456         /* We'll have to hope for the best */
1457         if (!runtime_ss && syms_ss)
1458                 runtime_ss = syms_ss;
1459
1460         if (syms_ss)
1461                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1462         else
1463                 ret = -1;
1464
1465         if (ret > 0) {
1466                 int nr_plt;
1467
1468                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1469                 if (nr_plt > 0)
1470                         ret += nr_plt;
1471         }
1472
1473         for (; ss_pos > 0; ss_pos--)
1474                 symsrc__destroy(&ss_[ss_pos - 1]);
1475 out_free:
1476         free(name);
1477         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1478                 return 0;
1479         return ret;
1480 }
1481
1482 struct map *map_groups__find_by_name(struct map_groups *mg,
1483                                      enum map_type type, const char *name)
1484 {
1485         struct rb_node *nd;
1486
1487         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1488                 struct map *map = rb_entry(nd, struct map, rb_node);
1489
1490                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1491                         return map;
1492         }
1493
1494         return NULL;
1495 }
1496
1497 int dso__load_vmlinux(struct dso *dso, struct map *map,
1498                       const char *vmlinux, bool vmlinux_allocated,
1499                       symbol_filter_t filter)
1500 {
1501         int err = -1;
1502         struct symsrc ss;
1503         char symfs_vmlinux[PATH_MAX];
1504         enum dso_binary_type symtab_type;
1505
1506         if (vmlinux[0] == '/')
1507                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1508         else
1509                 symbol__join_symfs(symfs_vmlinux, vmlinux);
1510
1511         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1512                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1513         else
1514                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1515
1516         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1517                 return -1;
1518
1519         err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1520         symsrc__destroy(&ss);
1521
1522         if (err > 0) {
1523                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1524                         dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1525                 else
1526                         dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1527                 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1528                 dso__set_loaded(dso, map->type);
1529                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1530         }
1531
1532         return err;
1533 }
1534
1535 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1536                            symbol_filter_t filter)
1537 {
1538         int i, err = 0;
1539         char *filename = NULL;
1540
1541         if (!symbol_conf.ignore_vmlinux_buildid)
1542                 filename = dso__build_id_filename(dso, NULL, 0);
1543         if (filename != NULL) {
1544                 err = dso__load_vmlinux(dso, map, filename, true, filter);
1545                 if (err > 0)
1546                         goto out;
1547                 free(filename);
1548         }
1549
1550         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1551                  vmlinux_path__nr_entries + 1);
1552
1553         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1554                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1555                 if (err > 0)
1556                         break;
1557         }
1558 out:
1559         return err;
1560 }
1561
1562 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1563 {
1564         char kallsyms_filename[PATH_MAX];
1565         struct dirent *dent;
1566         int ret = -1;
1567         DIR *d;
1568
1569         d = opendir(dir);
1570         if (!d)
1571                 return -1;
1572
1573         while (1) {
1574                 dent = readdir(d);
1575                 if (!dent)
1576                         break;
1577                 if (dent->d_type != DT_DIR)
1578                         continue;
1579                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1580                           "%s/%s/kallsyms", dir, dent->d_name);
1581                 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1582                         strlcpy(dir, kallsyms_filename, dir_sz);
1583                         ret = 0;
1584                         break;
1585                 }
1586         }
1587
1588         closedir(d);
1589
1590         return ret;
1591 }
1592
1593 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1594 {
1595         u8 host_build_id[BUILD_ID_SIZE];
1596         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1597         bool is_host = false;
1598         char path[PATH_MAX];
1599
1600         if (!dso->has_build_id) {
1601                 /*
1602                  * Last resort, if we don't have a build-id and couldn't find
1603                  * any vmlinux file, try the running kernel kallsyms table.
1604                  */
1605                 goto proc_kallsyms;
1606         }
1607
1608         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1609                                  sizeof(host_build_id)) == 0)
1610                 is_host = dso__build_id_equal(dso, host_build_id);
1611
1612         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1613
1614         scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1615                   sbuild_id);
1616
1617         /* Use /proc/kallsyms if possible */
1618         if (is_host) {
1619                 DIR *d;
1620                 int fd;
1621
1622                 /* If no cached kcore go with /proc/kallsyms */
1623                 d = opendir(path);
1624                 if (!d)
1625                         goto proc_kallsyms;
1626                 closedir(d);
1627
1628                 /*
1629                  * Do not check the build-id cache, until we know we cannot use
1630                  * /proc/kcore.
1631                  */
1632                 fd = open("/proc/kcore", O_RDONLY);
1633                 if (fd != -1) {
1634                         close(fd);
1635                         /* If module maps match go with /proc/kallsyms */
1636                         if (!validate_kcore_addresses("/proc/kallsyms", map))
1637                                 goto proc_kallsyms;
1638                 }
1639
1640                 /* Find kallsyms in build-id cache with kcore */
1641                 if (!find_matching_kcore(map, path, sizeof(path)))
1642                         return strdup(path);
1643
1644                 goto proc_kallsyms;
1645         }
1646
1647         /* Find kallsyms in build-id cache with kcore */
1648         if (!find_matching_kcore(map, path, sizeof(path)))
1649                 return strdup(path);
1650
1651         scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1652                   buildid_dir, sbuild_id);
1653
1654         if (access(path, F_OK)) {
1655                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1656                        sbuild_id);
1657                 return NULL;
1658         }
1659
1660         return strdup(path);
1661
1662 proc_kallsyms:
1663         return strdup("/proc/kallsyms");
1664 }
1665
1666 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1667                                 symbol_filter_t filter)
1668 {
1669         int err;
1670         const char *kallsyms_filename = NULL;
1671         char *kallsyms_allocated_filename = NULL;
1672         /*
1673          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1674          * it and only it, reporting errors to the user if it cannot be used.
1675          *
1676          * For instance, try to analyse an ARM perf.data file _without_ a
1677          * build-id, or if the user specifies the wrong path to the right
1678          * vmlinux file, obviously we can't fallback to another vmlinux (a
1679          * x86_86 one, on the machine where analysis is being performed, say),
1680          * or worse, /proc/kallsyms.
1681          *
1682          * If the specified file _has_ a build-id and there is a build-id
1683          * section in the perf.data file, we will still do the expected
1684          * validation in dso__load_vmlinux and will bail out if they don't
1685          * match.
1686          */
1687         if (symbol_conf.kallsyms_name != NULL) {
1688                 kallsyms_filename = symbol_conf.kallsyms_name;
1689                 goto do_kallsyms;
1690         }
1691
1692         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1693                 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1694                                          false, filter);
1695         }
1696
1697         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1698                 err = dso__load_vmlinux_path(dso, map, filter);
1699                 if (err > 0)
1700                         return err;
1701         }
1702
1703         /* do not try local files if a symfs was given */
1704         if (symbol_conf.symfs[0] != 0)
1705                 return -1;
1706
1707         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1708         if (!kallsyms_allocated_filename)
1709                 return -1;
1710
1711         kallsyms_filename = kallsyms_allocated_filename;
1712
1713 do_kallsyms:
1714         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1715         if (err > 0)
1716                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1717         free(kallsyms_allocated_filename);
1718
1719         if (err > 0 && !dso__is_kcore(dso)) {
1720                 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1721                 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1722                 map__fixup_start(map);
1723                 map__fixup_end(map);
1724         }
1725
1726         return err;
1727 }
1728
1729 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1730                                       symbol_filter_t filter)
1731 {
1732         int err;
1733         const char *kallsyms_filename = NULL;
1734         struct machine *machine;
1735         char path[PATH_MAX];
1736
1737         if (!map->groups) {
1738                 pr_debug("Guest kernel map hasn't the point to groups\n");
1739                 return -1;
1740         }
1741         machine = map->groups->machine;
1742
1743         if (machine__is_default_guest(machine)) {
1744                 /*
1745                  * if the user specified a vmlinux filename, use it and only
1746                  * it, reporting errors to the user if it cannot be used.
1747                  * Or use file guest_kallsyms inputted by user on commandline
1748                  */
1749                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1750                         err = dso__load_vmlinux(dso, map,
1751                                                 symbol_conf.default_guest_vmlinux_name,
1752                                                 false, filter);
1753                         return err;
1754                 }
1755
1756                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1757                 if (!kallsyms_filename)
1758                         return -1;
1759         } else {
1760                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1761                 kallsyms_filename = path;
1762         }
1763
1764         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1765         if (err > 0)
1766                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1767         if (err > 0 && !dso__is_kcore(dso)) {
1768                 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1769                 machine__mmap_name(machine, path, sizeof(path));
1770                 dso__set_long_name(dso, strdup(path), true);
1771                 map__fixup_start(map);
1772                 map__fixup_end(map);
1773         }
1774
1775         return err;
1776 }
1777
1778 static void vmlinux_path__exit(void)
1779 {
1780         while (--vmlinux_path__nr_entries >= 0)
1781                 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1782
1783         zfree(&vmlinux_path);
1784 }
1785
1786 static int vmlinux_path__init(struct perf_session_env *env)
1787 {
1788         struct utsname uts;
1789         char bf[PATH_MAX];
1790         char *kernel_version;
1791
1792         vmlinux_path = malloc(sizeof(char *) * 6);
1793         if (vmlinux_path == NULL)
1794                 return -1;
1795
1796         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1797         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1798                 goto out_fail;
1799         ++vmlinux_path__nr_entries;
1800         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1801         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1802                 goto out_fail;
1803         ++vmlinux_path__nr_entries;
1804
1805         /* only try kernel version if no symfs was given */
1806         if (symbol_conf.symfs[0] != 0)
1807                 return 0;
1808
1809         if (env) {
1810                 kernel_version = env->os_release;
1811         } else {
1812                 if (uname(&uts) < 0)
1813                         goto out_fail;
1814
1815                 kernel_version = uts.release;
1816         }
1817
1818         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1819         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1820         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1821                 goto out_fail;
1822         ++vmlinux_path__nr_entries;
1823         snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
1824                  kernel_version);
1825         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1826         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1827                 goto out_fail;
1828         ++vmlinux_path__nr_entries;
1829         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1830         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1831         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1832                 goto out_fail;
1833         ++vmlinux_path__nr_entries;
1834         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1835                  kernel_version);
1836         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1837         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1838                 goto out_fail;
1839         ++vmlinux_path__nr_entries;
1840
1841         return 0;
1842
1843 out_fail:
1844         vmlinux_path__exit();
1845         return -1;
1846 }
1847
1848 int setup_list(struct strlist **list, const char *list_str,
1849                       const char *list_name)
1850 {
1851         if (list_str == NULL)
1852                 return 0;
1853
1854         *list = strlist__new(true, list_str);
1855         if (!*list) {
1856                 pr_err("problems parsing %s list\n", list_name);
1857                 return -1;
1858         }
1859         return 0;
1860 }
1861
1862 static bool symbol__read_kptr_restrict(void)
1863 {
1864         bool value = false;
1865
1866         if (geteuid() != 0) {
1867                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1868                 if (fp != NULL) {
1869                         char line[8];
1870
1871                         if (fgets(line, sizeof(line), fp) != NULL)
1872                                 value = atoi(line) != 0;
1873
1874                         fclose(fp);
1875                 }
1876         }
1877
1878         return value;
1879 }
1880
1881 int symbol__init(struct perf_session_env *env)
1882 {
1883         const char *symfs;
1884
1885         if (symbol_conf.initialized)
1886                 return 0;
1887
1888         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1889
1890         symbol__elf_init();
1891
1892         if (symbol_conf.sort_by_name)
1893                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1894                                           sizeof(struct symbol));
1895
1896         if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1897                 return -1;
1898
1899         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1900                 pr_err("'.' is the only non valid --field-separator argument\n");
1901                 return -1;
1902         }
1903
1904         if (setup_list(&symbol_conf.dso_list,
1905                        symbol_conf.dso_list_str, "dso") < 0)
1906                 return -1;
1907
1908         if (setup_list(&symbol_conf.comm_list,
1909                        symbol_conf.comm_list_str, "comm") < 0)
1910                 goto out_free_dso_list;
1911
1912         if (setup_list(&symbol_conf.sym_list,
1913                        symbol_conf.sym_list_str, "symbol") < 0)
1914                 goto out_free_comm_list;
1915
1916         /*
1917          * A path to symbols of "/" is identical to ""
1918          * reset here for simplicity.
1919          */
1920         symfs = realpath(symbol_conf.symfs, NULL);
1921         if (symfs == NULL)
1922                 symfs = symbol_conf.symfs;
1923         if (strcmp(symfs, "/") == 0)
1924                 symbol_conf.symfs = "";
1925         if (symfs != symbol_conf.symfs)
1926                 free((void *)symfs);
1927
1928         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1929
1930         symbol_conf.initialized = true;
1931         return 0;
1932
1933 out_free_comm_list:
1934         strlist__delete(symbol_conf.comm_list);
1935 out_free_dso_list:
1936         strlist__delete(symbol_conf.dso_list);
1937         return -1;
1938 }
1939
1940 void symbol__exit(void)
1941 {
1942         if (!symbol_conf.initialized)
1943                 return;
1944         strlist__delete(symbol_conf.sym_list);
1945         strlist__delete(symbol_conf.dso_list);
1946         strlist__delete(symbol_conf.comm_list);
1947         vmlinux_path__exit();
1948         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1949         symbol_conf.initialized = false;
1950 }