tools/perf/util/map.c

   1 #include "symbol.h"
   2 #include <assert.h>
   3 #include <errno.h>
   4 #include <inttypes.h>
   5 #include <limits.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <unistd.h>
  10 #include "map.h"
  11 #include "thread.h"
  12 #include "strlist.h"
  13 #include "vdso.h"
  14 #include "build-id.h"
  15 #include "util.h"
  16 #include "debug.h"
  17 #include "machine.h"
  18 #include <linux/string.h>
  19
  20 static void __maps__insert(struct maps *maps, struct map *map);
  21
  22 const char *map_type__name[MAP__NR_TYPES] = {
  23         [MAP__FUNCTION] = "Functions",
  24         [MAP__VARIABLE] = "Variables",
  25 };
  26
  27 static inline int is_anon_memory(const char *filename)
  28 {
  29         return !strcmp(filename, "//anon") ||
  30                !strcmp(filename, "/dev/zero (deleted)") ||
  31                !strcmp(filename, "/anon_hugepage (deleted)");
  32 }
  33
  34 static inline int is_no_dso_memory(const char *filename)
  35 {
  36         return !strncmp(filename, "[stack", 6) ||
  37                !strncmp(filename, "/SYSV",5)   ||
  38                !strcmp(filename, "[heap]");
  39 }
  40
  41 static inline int is_android_lib(const char *filename)
  42 {
  43         return !strncmp(filename, "/data/app-lib", 13) ||
  44                !strncmp(filename, "/system/lib", 11);
  45 }
  46
  47 static inline bool replace_android_lib(const char *filename, char *newfilename)
  48 {
  49         const char *libname;
  50         char *app_abi;
  51         size_t app_abi_length, new_length;
  52         size_t lib_length = 0;
  53
  54         libname  = strrchr(filename, '/');
  55         if (libname)
  56                 lib_length = strlen(libname);
  57
  58         app_abi = getenv("APP_ABI");
  59         if (!app_abi)
  60                 return false;
  61
  62         app_abi_length = strlen(app_abi);
  63
  64         if (!strncmp(filename, "/data/app-lib", 13)) {
  65                 char *apk_path;
  66
  67                 if (!app_abi_length)
  68                         return false;
  69
  70                 new_length = 7 + app_abi_length + lib_length;
  71
  72                 apk_path = getenv("APK_PATH");
  73                 if (apk_path) {
  74                         new_length += strlen(apk_path) + 1;
  75                         if (new_length > PATH_MAX)
  76                                 return false;
  77                         snprintf(newfilename, new_length,
  78                                  "%s/libs/%s/%s", apk_path, app_abi, libname);
  79                 } else {
  80                         if (new_length > PATH_MAX)
  81                                 return false;
  82                         snprintf(newfilename, new_length,
  83                                  "libs/%s/%s", app_abi, libname);
  84                 }
  85                 return true;
  86         }
  87
  88         if (!strncmp(filename, "/system/lib/", 11)) {
  89                 char *ndk, *app;
  90                 const char *arch;
  91                 size_t ndk_length;
  92                 size_t app_length;
  93
  94                 ndk = getenv("NDK_ROOT");
  95                 app = getenv("APP_PLATFORM");
  96
  97                 if (!(ndk && app))
  98                         return false;
  99
 100                 ndk_length = strlen(ndk);
 101                 app_length = strlen(app);
 102
 103                 if (!(ndk_length && app_length && app_abi_length))
 104                         return false;
 105
 106                 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
 107                        !strncmp(app_abi, "mips", 4) ? "mips" :
 108                        !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
 109
 110                 if (!arch)
 111                         return false;
 112
 113                 new_length = 27 + ndk_length +
 114                              app_length + lib_length
 115                            + strlen(arch);
 116
 117                 if (new_length > PATH_MAX)
 118                         return false;
 119                 snprintf(newfilename, new_length,
 120                         "%s/platforms/%s/arch-%s/usr/lib/%s",
 121                         ndk, app, arch, libname);
 122
 123                 return true;
 124         }
 125         return false;
 126 }
 127
 128 void map__init(struct map *map, enum map_type type,
 129                u64 start, u64 end, u64 pgoff, struct dso *dso)
 130 {
 131         map->type     = type;
 132         map->start    = start;
 133         map->end      = end;
 134         map->pgoff    = pgoff;
 135         map->reloc    = 0;
 136         map->dso      = dso__get(dso);
 137         map->map_ip   = map__map_ip;
 138         map->unmap_ip = map__unmap_ip;
 139         RB_CLEAR_NODE(&map->rb_node);
 140         map->groups   = NULL;
 141         map->erange_warned = false;
 142         atomic_set(&map->refcnt, 1);
 143 }
 144
 145 struct map *map__new(struct machine *machine, u64 start, u64 len,
 146                      u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino,
 147                      u64 ino_gen, u32 prot, u32 flags, char *filename,
 148                      enum map_type type, struct thread *thread)
 149 {
 150         struct map *map = malloc(sizeof(*map));
 151
 152         if (map != NULL) {
 153                 char newfilename[PATH_MAX];
 154                 struct dso *dso;
 155                 int anon, no_dso, vdso, android;
 156
 157                 android = is_android_lib(filename);
 158                 anon = is_anon_memory(filename);
 159                 vdso = is_vdso_map(filename);
 160                 no_dso = is_no_dso_memory(filename);
 161
 162                 map->maj = d_maj;
 163                 map->min = d_min;
 164                 map->ino = ino;
 165                 map->ino_generation = ino_gen;
 166                 map->prot = prot;
 167                 map->flags = flags;
 168
 169                 if ((anon || no_dso) && type == MAP__FUNCTION) {
 170                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
 171                         filename = newfilename;
 172                 }
 173
 174                 if (android) {
 175                         if (replace_android_lib(filename, newfilename))
 176                                 filename = newfilename;
 177                 }
 178
 179                 if (vdso) {
 180                         pgoff = 0;
 181                         dso = machine__findnew_vdso(machine, thread);
 182                 } else
 183                         dso = machine__findnew_dso(machine, filename);
 184
 185                 if (dso == NULL)
 186                         goto out_delete;
 187
 188                 map__init(map, type, start, start + len, pgoff, dso);
 189
 190                 if (anon || no_dso) {
 191                         map->map_ip = map->unmap_ip = identity__map_ip;
 192
 193                         /*
 194                          * Set memory without DSO as loaded. All map__find_*
 195                          * functions still return NULL, and we avoid the
 196                          * unnecessary map__load warning.
 197                          */
 198                         if (type != MAP__FUNCTION)
 199                                 dso__set_loaded(dso, map->type);
 200                 }
 201                 dso__put(dso);
 202         }
 203         return map;
 204 out_delete:
 205         free(map);
 206         return NULL;
 207 }
 208
 209 /*
 210  * Constructor variant for modules (where we know from /proc/modules where
 211  * they are loaded) and for vmlinux, where only after we load all the
 212  * symbols we'll know where it starts and ends.
 213  */
 214 struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
 215 {
 216         struct map *map = calloc(1, (sizeof(*map) +
 217                                      (dso->kernel ? sizeof(struct kmap) : 0)));
 218         if (map != NULL) {
 219                 /*
 220                  * ->end will be filled after we load all the symbols
 221                  */
 222                 map__init(map, type, start, 0, 0, dso);
 223         }
 224
 225         return map;
 226 }
 227
 228 /*
 229  * Use this and __map__is_kmodule() for map instances that are in
 230  * machine->kmaps, and thus have map->groups->machine all properly set, to
 231  * disambiguate between the kernel and modules.
 232  *
 233  * When the need arises, introduce map__is_{kernel,kmodule)() that
 234  * checks (map->groups != NULL && map->groups->machine != NULL &&
 235  * map->dso->kernel) before calling __map__is_{kernel,kmodule}())
 236  */
 237 bool __map__is_kernel(const struct map *map)
 238 {
 239         return __machine__kernel_map(map->groups->machine, map->type) == map;
 240 }
 241
 242 static void map__exit(struct map *map)
 243 {
 244         BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
 245         dso__zput(map->dso);
 246 }
 247
 248 void map__delete(struct map *map)
 249 {
 250         map__exit(map);
 251         free(map);
 252 }
 253
 254 void map__put(struct map *map)
 255 {
 256         if (map && atomic_dec_and_test(&map->refcnt))
 257                 map__delete(map);
 258 }
 259
 260 void map__fixup_start(struct map *map)
 261 {
 262         struct rb_root *symbols = &map->dso->symbols[map->type];
 263         struct rb_node *nd = rb_first(symbols);
 264         if (nd != NULL) {
 265                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
 266                 map->start = sym->start;
 267         }
 268 }
 269
 270 void map__fixup_end(struct map *map)
 271 {
 272         struct rb_root *symbols = &map->dso->symbols[map->type];
 273         struct rb_node *nd = rb_last(symbols);
 274         if (nd != NULL) {
 275                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
 276                 map->end = sym->end;
 277         }
 278 }
 279
 280 #define DSO__DELETED "(deleted)"
 281
 282 int map__load(struct map *map, symbol_filter_t filter)
 283 {
 284         const char *name = map->dso->long_name;
 285         int nr;
 286
 287         if (dso__loaded(map->dso, map->type))
 288                 return 0;
 289
 290         nr = dso__load(map->dso, map, filter);
 291         if (nr < 0) {
 292                 if (map->dso->has_build_id) {
 293                         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 294
 295                         build_id__sprintf(map->dso->build_id,
 296                                           sizeof(map->dso->build_id),
 297                                           sbuild_id);
 298                         pr_warning("%s with build id %s not found",
 299                                    name, sbuild_id);
 300                 } else
 301                         pr_warning("Failed to open %s", name);
 302
 303                 pr_warning(", continuing without symbols\n");
 304                 return -1;
 305         } else if (nr == 0) {
 306 #ifdef HAVE_LIBELF_SUPPORT
 307                 const size_t len = strlen(name);
 308                 const size_t real_len = len - sizeof(DSO__DELETED);
 309
 310                 if (len > sizeof(DSO__DELETED) &&
 311                     strcmp(name + real_len + 1, DSO__DELETED) == 0) {
 312                         pr_warning("%.*s was updated (is prelink enabled?). "
 313                                 "Restart the long running apps that use it!\n",
 314                                    (int)real_len, name);
 315                 } else {
 316                         pr_warning("no symbols found in %s, maybe install "
 317                                    "a debug package?\n", name);
 318                 }
 319 #endif
 320                 return -1;
 321         }
 322
 323         return 0;
 324 }
 325
 326 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
 327 {
 328         return strcmp(namea, nameb);
 329 }
 330
 331 struct symbol *map__find_symbol(struct map *map, u64 addr,
 332                                 symbol_filter_t filter)
 333 {
 334         if (map__load(map, filter) < 0)
 335                 return NULL;
 336
 337         return dso__find_symbol(map->dso, map->type, addr);
 338 }
 339
 340 struct symbol *map__find_symbol_by_name(struct map *map, const char *name,
 341                                         symbol_filter_t filter)
 342 {
 343         if (map__load(map, filter) < 0)
 344                 return NULL;
 345
 346         if (!dso__sorted_by_name(map->dso, map->type))
 347                 dso__sort_by_name(map->dso, map->type);
 348
 349         return dso__find_symbol_by_name(map->dso, map->type, name);
 350 }
 351
 352 struct map *map__clone(struct map *from)
 353 {
 354         struct map *map = memdup(from, sizeof(*map));
 355
 356         if (map != NULL) {
 357                 atomic_set(&map->refcnt, 1);
 358                 RB_CLEAR_NODE(&map->rb_node);
 359                 dso__get(map->dso);
 360                 map->groups = NULL;
 361         }
 362
 363         return map;
 364 }
 365
 366 int map__overlap(struct map *l, struct map *r)
 367 {
 368         if (l->start > r->start) {
 369                 struct map *t = l;
 370                 l = r;
 371                 r = t;
 372         }
 373
 374         if (l->end > r->start)
 375                 return 1;
 376
 377         return 0;
 378 }
 379
 380 size_t map__fprintf(struct map *map, FILE *fp)
 381 {
 382         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
 383                        map->start, map->end, map->pgoff, map->dso->name);
 384 }
 385
 386 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
 387 {
 388         const char *dsoname = "[unknown]";
 389
 390         if (map && map->dso && (map->dso->name || map->dso->long_name)) {
 391                 if (symbol_conf.show_kernel_path && map->dso->long_name)
 392                         dsoname = map->dso->long_name;
 393                 else if (map->dso->name)
 394                         dsoname = map->dso->name;
 395         }
 396
 397         return fprintf(fp, "%s", dsoname);
 398 }
 399
 400 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
 401                          FILE *fp)
 402 {
 403         char *srcline;
 404         int ret = 0;
 405
 406         if (map && map->dso) {
 407                 srcline = get_srcline(map->dso,
 408                                       map__rip_2objdump(map, addr), NULL, true);
 409                 if (srcline != SRCLINE_UNKNOWN)
 410                         ret = fprintf(fp, "%s%s", prefix, srcline);
 411                 free_srcline(srcline);
 412         }
 413         return ret;
 414 }
 415
 416 /**
 417  * map__rip_2objdump - convert symbol start address to objdump address.
 418  * @map: memory map
 419  * @rip: symbol start address
 420  *
 421  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
 422  * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
 423  * relative to section start.
 424  *
 425  * Return: Address suitable for passing to "objdump --start-address="
 426  */
 427 u64 map__rip_2objdump(struct map *map, u64 rip)
 428 {
 429         if (!map->dso->adjust_symbols)
 430                 return rip;
 431
 432         if (map->dso->rel)
 433                 return rip - map->pgoff;
 434
 435         return map->unmap_ip(map, rip) - map->reloc;
 436 }
 437
 438 /**
 439  * map__objdump_2mem - convert objdump address to a memory address.
 440  * @map: memory map
 441  * @ip: objdump address
 442  *
 443  * Closely related to map__rip_2objdump(), this function takes an address from
 444  * objdump and converts it to a memory address.  Note this assumes that @map
 445  * contains the address.  To be sure the result is valid, check it forwards
 446  * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
 447  *
 448  * Return: Memory address.
 449  */
 450 u64 map__objdump_2mem(struct map *map, u64 ip)
 451 {
 452         if (!map->dso->adjust_symbols)
 453                 return map->unmap_ip(map, ip);
 454
 455         if (map->dso->rel)
 456                 return map->unmap_ip(map, ip + map->pgoff);
 457
 458         return ip + map->reloc;
 459 }
 460
 461 static void maps__init(struct maps *maps)
 462 {
 463         maps->entries = RB_ROOT;
 464         pthread_rwlock_init(&maps->lock, NULL);
 465 }
 466
 467 void map_groups__init(struct map_groups *mg, struct machine *machine)
 468 {
 469         int i;
 470         for (i = 0; i < MAP__NR_TYPES; ++i) {
 471                 maps__init(&mg->maps[i]);
 472         }
 473         mg->machine = machine;
 474         atomic_set(&mg->refcnt, 1);
 475 }
 476
 477 static void __maps__purge(struct maps *maps)
 478 {
 479         struct rb_root *root = &maps->entries;
 480         struct rb_node *next = rb_first(root);
 481
 482         while (next) {
 483                 struct map *pos = rb_entry(next, struct map, rb_node);
 484
 485                 next = rb_next(&pos->rb_node);
 486                 rb_erase_init(&pos->rb_node, root);
 487                 map__put(pos);
 488         }
 489 }
 490
 491 static void maps__exit(struct maps *maps)
 492 {
 493         pthread_rwlock_wrlock(&maps->lock);
 494         __maps__purge(maps);
 495         pthread_rwlock_unlock(&maps->lock);
 496 }
 497
 498 void map_groups__exit(struct map_groups *mg)
 499 {
 500         int i;
 501
 502         for (i = 0; i < MAP__NR_TYPES; ++i)
 503                 maps__exit(&mg->maps[i]);
 504 }
 505
 506 bool map_groups__empty(struct map_groups *mg)
 507 {
 508         int i;
 509
 510         for (i = 0; i < MAP__NR_TYPES; ++i) {
 511                 if (maps__first(&mg->maps[i]))
 512                         return false;
 513         }
 514
 515         return true;
 516 }
 517
 518 struct map_groups *map_groups__new(struct machine *machine)
 519 {
 520         struct map_groups *mg = malloc(sizeof(*mg));
 521
 522         if (mg != NULL)
 523                 map_groups__init(mg, machine);
 524
 525         return mg;
 526 }
 527
 528 void map_groups__delete(struct map_groups *mg)
 529 {
 530         map_groups__exit(mg);
 531         free(mg);
 532 }
 533
 534 void map_groups__put(struct map_groups *mg)
 535 {
 536         if (mg && atomic_dec_and_test(&mg->refcnt))
 537                 map_groups__delete(mg);
 538 }
 539
 540 struct symbol *map_groups__find_symbol(struct map_groups *mg,
 541                                        enum map_type type, u64 addr,
 542                                        struct map **mapp,
 543                                        symbol_filter_t filter)
 544 {
 545         struct map *map = map_groups__find(mg, type, addr);
 546
 547         /* Ensure map is loaded before using map->map_ip */
 548         if (map != NULL && map__load(map, filter) >= 0) {
 549                 if (mapp != NULL)
 550                         *mapp = map;
 551                 return map__find_symbol(map, map->map_ip(map, addr), filter);
 552         }
 553
 554         return NULL;
 555 }
 556
 557 struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
 558                                          struct map **mapp, symbol_filter_t filter)
 559 {
 560         struct symbol *sym;
 561         struct rb_node *nd;
 562
 563         pthread_rwlock_rdlock(&maps->lock);
 564
 565         for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
 566                 struct map *pos = rb_entry(nd, struct map, rb_node);
 567
 568                 sym = map__find_symbol_by_name(pos, name, filter);
 569
 570                 if (sym == NULL)
 571                         continue;
 572                 if (mapp != NULL)
 573                         *mapp = pos;
 574                 goto out;
 575         }
 576
 577         sym = NULL;
 578 out:
 579         pthread_rwlock_unlock(&maps->lock);
 580         return sym;
 581 }
 582
 583 struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
 584                                                enum map_type type,
 585                                                const char *name,
 586                                                struct map **mapp,
 587                                                symbol_filter_t filter)
 588 {
 589         struct symbol *sym = maps__find_symbol_by_name(&mg->maps[type], name, mapp, filter);
 590
 591         return sym;
 592 }
 593
 594 int map_groups__find_ams(struct addr_map_symbol *ams, symbol_filter_t filter)
 595 {
 596         if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
 597                 if (ams->map->groups == NULL)
 598                         return -1;
 599                 ams->map = map_groups__find(ams->map->groups, ams->map->type,
 600                                             ams->addr);
 601                 if (ams->map == NULL)
 602                         return -1;
 603         }
 604
 605         ams->al_addr = ams->map->map_ip(ams->map, ams->addr);
 606         ams->sym = map__find_symbol(ams->map, ams->al_addr, filter);
 607
 608         return ams->sym ? 0 : -1;
 609 }
 610
 611 static size_t maps__fprintf(struct maps *maps, FILE *fp)
 612 {
 613         size_t printed = 0;
 614         struct rb_node *nd;
 615
 616         pthread_rwlock_rdlock(&maps->lock);
 617
 618         for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
 619                 struct map *pos = rb_entry(nd, struct map, rb_node);
 620                 printed += fprintf(fp, "Map:");
 621                 printed += map__fprintf(pos, fp);
 622                 if (verbose > 2) {
 623                         printed += dso__fprintf(pos->dso, pos->type, fp);
 624                         printed += fprintf(fp, "--\n");
 625                 }
 626         }
 627
 628         pthread_rwlock_unlock(&maps->lock);
 629
 630         return printed;
 631 }
 632
 633 size_t __map_groups__fprintf_maps(struct map_groups *mg, enum map_type type,
 634                                   FILE *fp)
 635 {
 636         size_t printed = fprintf(fp, "%s:\n", map_type__name[type]);
 637         return printed += maps__fprintf(&mg->maps[type], fp);
 638 }
 639
 640 size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
 641 {
 642         size_t printed = 0, i;
 643         for (i = 0; i < MAP__NR_TYPES; ++i)
 644                 printed += __map_groups__fprintf_maps(mg, i, fp);
 645         return printed;
 646 }
 647
 648 static void __map_groups__insert(struct map_groups *mg, struct map *map)
 649 {
 650         __maps__insert(&mg->maps[map->type], map);
 651         map->groups = mg;
 652 }
 653
 654 static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
 655 {
 656         struct rb_root *root;
 657         struct rb_node *next;
 658         int err = 0;
 659
 660         pthread_rwlock_wrlock(&maps->lock);
 661
 662         root = &maps->entries;
 663         next = rb_first(root);
 664
 665         while (next) {
 666                 struct map *pos = rb_entry(next, struct map, rb_node);
 667                 next = rb_next(&pos->rb_node);
 668
 669                 if (!map__overlap(pos, map))
 670                         continue;
 671
 672                 if (verbose >= 2) {
 673                         fputs("overlapping maps:\n", fp);
 674                         map__fprintf(map, fp);
 675                         map__fprintf(pos, fp);
 676                 }
 677
 678                 rb_erase_init(&pos->rb_node, root);
 679                 /*
 680                  * Now check if we need to create new maps for areas not
 681                  * overlapped by the new map:
 682                  */
 683                 if (map->start > pos->start) {
 684                         struct map *before = map__clone(pos);
 685
 686                         if (before == NULL) {
 687                                 err = -ENOMEM;
 688                                 goto put_map;
 689                         }
 690
 691                         before->end = map->start;
 692                         __map_groups__insert(pos->groups, before);
 693                         if (verbose >= 2)
 694                                 map__fprintf(before, fp);
 695                 }
 696
 697                 if (map->end < pos->end) {
 698                         struct map *after = map__clone(pos);
 699
 700                         if (after == NULL) {
 701                                 err = -ENOMEM;
 702                                 goto put_map;
 703                         }
 704
 705                         after->start = map->end;
 706                         after->pgoff += map->end - pos->start;
 707                         assert(pos->map_ip(pos, map->end) == after->map_ip(after, map->end));
 708                         __map_groups__insert(pos->groups, after);
 709                         if (verbose >= 2)
 710                                 map__fprintf(after, fp);
 711                 }
 712 put_map:
 713                 map__put(pos);
 714
 715                 if (err)
 716                         goto out;
 717         }
 718
 719         err = 0;
 720 out:
 721         pthread_rwlock_unlock(&maps->lock);
 722         return err;
 723 }
 724
 725 int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
 726                                    FILE *fp)
 727 {
 728         return maps__fixup_overlappings(&mg->maps[map->type], map, fp);
 729 }
 730
 731 /*
 732  * XXX This should not really _copy_ te maps, but refcount them.
 733  */
 734 int map_groups__clone(struct map_groups *mg,
 735                       struct map_groups *parent, enum map_type type)
 736 {
 737         int err = -ENOMEM;
 738         struct map *map;
 739         struct maps *maps = &parent->maps[type];
 740
 741         pthread_rwlock_rdlock(&maps->lock);
 742
 743         for (map = maps__first(maps); map; map = map__next(map)) {
 744                 struct map *new = map__clone(map);
 745                 if (new == NULL)
 746                         goto out_unlock;
 747                 map_groups__insert(mg, new);
 748         }
 749
 750         err = 0;
 751 out_unlock:
 752         pthread_rwlock_unlock(&maps->lock);
 753         return err;
 754 }
 755
 756 static void __maps__insert(struct maps *maps, struct map *map)
 757 {
 758         struct rb_node **p = &maps->entries.rb_node;
 759         struct rb_node *parent = NULL;
 760         const u64 ip = map->start;
 761         struct map *m;
 762
 763         while (*p != NULL) {
 764                 parent = *p;
 765                 m = rb_entry(parent, struct map, rb_node);
 766                 if (ip < m->start)
 767                         p = &(*p)->rb_left;
 768                 else
 769                         p = &(*p)->rb_right;
 770         }
 771
 772         rb_link_node(&map->rb_node, parent, p);
 773         rb_insert_color(&map->rb_node, &maps->entries);
 774         map__get(map);
 775 }
 776
 777 void maps__insert(struct maps *maps, struct map *map)
 778 {
 779         pthread_rwlock_wrlock(&maps->lock);
 780         __maps__insert(maps, map);
 781         pthread_rwlock_unlock(&maps->lock);
 782 }
 783
 784 static void __maps__remove(struct maps *maps, struct map *map)
 785 {
 786         rb_erase_init(&map->rb_node, &maps->entries);
 787         map__put(map);
 788 }
 789
 790 void maps__remove(struct maps *maps, struct map *map)
 791 {
 792         pthread_rwlock_wrlock(&maps->lock);
 793         __maps__remove(maps, map);
 794         pthread_rwlock_unlock(&maps->lock);
 795 }
 796
 797 struct map *maps__find(struct maps *maps, u64 ip)
 798 {
 799         struct rb_node **p, *parent = NULL;
 800         struct map *m;
 801
 802         pthread_rwlock_rdlock(&maps->lock);
 803
 804         p = &maps->entries.rb_node;
 805         while (*p != NULL) {
 806                 parent = *p;
 807                 m = rb_entry(parent, struct map, rb_node);
 808                 if (ip < m->start)
 809                         p = &(*p)->rb_left;
 810                 else if (ip >= m->end)
 811                         p = &(*p)->rb_right;
 812                 else
 813                         goto out;
 814         }
 815
 816         m = NULL;
 817 out:
 818         pthread_rwlock_unlock(&maps->lock);
 819         return m;
 820 }
 821
 822 struct map *maps__first(struct maps *maps)
 823 {
 824         struct rb_node *first = rb_first(&maps->entries);
 825
 826         if (first)
 827                 return rb_entry(first, struct map, rb_node);
 828         return NULL;
 829 }
 830
 831 struct map *map__next(struct map *map)
 832 {
 833         struct rb_node *next = rb_next(&map->rb_node);
 834
 835         if (next)
 836                 return rb_entry(next, struct map, rb_node);
 837         return NULL;
 838 }
 839
 840 struct kmap *map__kmap(struct map *map)
 841 {
 842         if (!map->dso || !map->dso->kernel) {
 843                 pr_err("Internal error: map__kmap with a non-kernel map\n");
 844                 return NULL;
 845         }
 846         return (struct kmap *)(map + 1);
 847 }
 848
 849 struct map_groups *map__kmaps(struct map *map)
 850 {
 851         struct kmap *kmap = map__kmap(map);
 852
 853         if (!kmap || !kmap->kmaps) {
 854                 pr_err("Internal error: map__kmaps with a non-kernel map\n");
 855                 return NULL;
 856         }
 857         return kmap->kmaps;
 858 }