tools/perf/util/map.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "symbol.h"
   3 #include <assert.h>
   4 #include <errno.h>
   5 #include <inttypes.h>
   6 #include <limits.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <stdio.h>
  10 #include <unistd.h>
  11 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
  12 #include "dso.h"
  13 #include "map.h"
  14 #include "map_symbol.h"
  15 #include "thread.h"
  16 #include "vdso.h"
  17 #include "build-id.h"
  18 #include "debug.h"
  19 #include "machine.h"
  20 #include <linux/string.h>
  21 #include <linux/zalloc.h>
  22 #include "srcline.h"
  23 #include "namespaces.h"
  24 #include "unwind.h"
  25 #include "srccode.h"
  26 #include "ui/ui.h"
  27
  28 static void __maps__insert(struct maps *maps, struct map *map);
  29
  30 static inline int is_anon_memory(const char *filename, u32 flags)
  31 {
  32         return flags & MAP_HUGETLB ||
  33                !strcmp(filename, "//anon") ||
  34                !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) ||
  35                !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1);
  36 }
  37
  38 static inline int is_no_dso_memory(const char *filename)
  39 {
  40         return !strncmp(filename, "[stack", 6) ||
  41                !strncmp(filename, "/SYSV",5)   ||
  42                !strcmp(filename, "[heap]");
  43 }
  44
  45 static inline int is_android_lib(const char *filename)
  46 {
  47         return strstarts(filename, "/data/app-lib/") ||
  48                strstarts(filename, "/system/lib/");
  49 }
  50
  51 static inline bool replace_android_lib(const char *filename, char *newfilename)
  52 {
  53         const char *libname;
  54         char *app_abi;
  55         size_t app_abi_length, new_length;
  56         size_t lib_length = 0;
  57
  58         libname  = strrchr(filename, '/');
  59         if (libname)
  60                 lib_length = strlen(libname);
  61
  62         app_abi = getenv("APP_ABI");
  63         if (!app_abi)
  64                 return false;
  65
  66         app_abi_length = strlen(app_abi);
  67
  68         if (strstarts(filename, "/data/app-lib/")) {
  69                 char *apk_path;
  70
  71                 if (!app_abi_length)
  72                         return false;
  73
  74                 new_length = 7 + app_abi_length + lib_length;
  75
  76                 apk_path = getenv("APK_PATH");
  77                 if (apk_path) {
  78                         new_length += strlen(apk_path) + 1;
  79                         if (new_length > PATH_MAX)
  80                                 return false;
  81                         snprintf(newfilename, new_length,
  82                                  "%s/libs/%s/%s", apk_path, app_abi, libname);
  83                 } else {
  84                         if (new_length > PATH_MAX)
  85                                 return false;
  86                         snprintf(newfilename, new_length,
  87                                  "libs/%s/%s", app_abi, libname);
  88                 }
  89                 return true;
  90         }
  91
  92         if (strstarts(filename, "/system/lib/")) {
  93                 char *ndk, *app;
  94                 const char *arch;
  95                 size_t ndk_length;
  96                 size_t app_length;
  97
  98                 ndk = getenv("NDK_ROOT");
  99                 app = getenv("APP_PLATFORM");
 100
 101                 if (!(ndk && app))
 102                         return false;
 103
 104                 ndk_length = strlen(ndk);
 105                 app_length = strlen(app);
 106
 107                 if (!(ndk_length && app_length && app_abi_length))
 108                         return false;
 109
 110                 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
 111                        !strncmp(app_abi, "mips", 4) ? "mips" :
 112                        !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
 113
 114                 if (!arch)
 115                         return false;
 116
 117                 new_length = 27 + ndk_length +
 118                              app_length + lib_length
 119                            + strlen(arch);
 120
 121                 if (new_length > PATH_MAX)
 122                         return false;
 123                 snprintf(newfilename, new_length,
 124                         "%s/platforms/%s/arch-%s/usr/lib/%s",
 125                         ndk, app, arch, libname);
 126
 127                 return true;
 128         }
 129         return false;
 130 }
 131
 132 void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
 133 {
 134         map->start    = start;
 135         map->end      = end;
 136         map->pgoff    = pgoff;
 137         map->reloc    = 0;
 138         map->dso      = dso__get(dso);
 139         map->map_ip   = map__map_ip;
 140         map->unmap_ip = map__unmap_ip;
 141         RB_CLEAR_NODE(&map->rb_node);
 142         map->erange_warned = false;
 143         refcount_set(&map->refcnt, 1);
 144 }
 145
 146 struct map *map__new(struct machine *machine, u64 start, u64 len,
 147                      u64 pgoff, struct dso_id *id,
 148                      u32 prot, u32 flags, char *filename,
 149                      struct thread *thread)
 150 {
 151         struct map *map = malloc(sizeof(*map));
 152         struct nsinfo *nsi = NULL;
 153         struct nsinfo *nnsi;
 154
 155         if (map != NULL) {
 156                 char newfilename[PATH_MAX];
 157                 struct dso *dso;
 158                 int anon, no_dso, vdso, android;
 159
 160                 android = is_android_lib(filename);
 161                 anon = is_anon_memory(filename, flags);
 162                 vdso = is_vdso_map(filename);
 163                 no_dso = is_no_dso_memory(filename);
 164                 map->prot = prot;
 165                 map->flags = flags;
 166                 nsi = nsinfo__get(thread->nsinfo);
 167
 168                 if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {
 169                         snprintf(newfilename, sizeof(newfilename),
 170                                  "/tmp/perf-%d.map", nsi->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                         /* The vdso maps are always on the host and not the
 181                          * container.  Ensure that we don't use setns to look
 182                          * them up.
 183                          */
 184                         nnsi = nsinfo__copy(nsi);
 185                         if (nnsi) {
 186                                 nsinfo__put(nsi);
 187                                 nnsi->need_setns = false;
 188                                 nsi = nnsi;
 189                         }
 190                         pgoff = 0;
 191                         dso = machine__findnew_vdso(machine, thread);
 192                 } else
 193                         dso = machine__findnew_dso_id(machine, filename, id);
 194
 195                 if (dso == NULL)
 196                         goto out_delete;
 197
 198                 map__init(map, start, start + len, pgoff, dso);
 199
 200                 if (anon || no_dso) {
 201                         map->map_ip = map->unmap_ip = identity__map_ip;
 202
 203                         /*
 204                          * Set memory without DSO as loaded. All map__find_*
 205                          * functions still return NULL, and we avoid the
 206                          * unnecessary map__load warning.
 207                          */
 208                         if (!(prot & PROT_EXEC))
 209                                 dso__set_loaded(dso);
 210                 }
 211                 dso->nsinfo = nsi;
 212                 dso__put(dso);
 213         }
 214         return map;
 215 out_delete:
 216         nsinfo__put(nsi);
 217         free(map);
 218         return NULL;
 219 }
 220
 221 /*
 222  * Constructor variant for modules (where we know from /proc/modules where
 223  * they are loaded) and for vmlinux, where only after we load all the
 224  * symbols we'll know where it starts and ends.
 225  */
 226 struct map *map__new2(u64 start, struct dso *dso)
 227 {
 228         struct map *map = calloc(1, (sizeof(*map) +
 229                                      (dso->kernel ? sizeof(struct kmap) : 0)));
 230         if (map != NULL) {
 231                 /*
 232                  * ->end will be filled after we load all the symbols
 233                  */
 234                 map__init(map, start, 0, 0, dso);
 235         }
 236
 237         return map;
 238 }
 239
 240 bool __map__is_kernel(const struct map *map)
 241 {
 242         if (!map->dso->kernel)
 243                 return false;
 244         return machine__kernel_map(map__kmaps((struct map *)map)->machine) == map;
 245 }
 246
 247 bool __map__is_extra_kernel_map(const struct map *map)
 248 {
 249         struct kmap *kmap = __map__kmap((struct map *)map);
 250
 251         return kmap && kmap->name[0];
 252 }
 253
 254 bool __map__is_bpf_prog(const struct map *map)
 255 {
 256         const char *name;
 257
 258         if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
 259                 return true;
 260
 261         /*
 262          * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
 263          * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
 264          * guess the type based on name.
 265          */
 266         name = map->dso->short_name;
 267         return name && (strstr(name, "bpf_prog_") == name);
 268 }
 269
 270 bool __map__is_ool(const struct map *map)
 271 {
 272         return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;
 273 }
 274
 275 bool map__has_symbols(const struct map *map)
 276 {
 277         return dso__has_symbols(map->dso);
 278 }
 279
 280 static void map__exit(struct map *map)
 281 {
 282         BUG_ON(refcount_read(&map->refcnt) != 0);
 283         dso__zput(map->dso);
 284 }
 285
 286 void map__delete(struct map *map)
 287 {
 288         map__exit(map);
 289         free(map);
 290 }
 291
 292 void map__put(struct map *map)
 293 {
 294         if (map && refcount_dec_and_test(&map->refcnt))
 295                 map__delete(map);
 296 }
 297
 298 void map__fixup_start(struct map *map)
 299 {
 300         struct rb_root_cached *symbols = &map->dso->symbols;
 301         struct rb_node *nd = rb_first_cached(symbols);
 302         if (nd != NULL) {
 303                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
 304                 map->start = sym->start;
 305         }
 306 }
 307
 308 void map__fixup_end(struct map *map)
 309 {
 310         struct rb_root_cached *symbols = &map->dso->symbols;
 311         struct rb_node *nd = rb_last(&symbols->rb_root);
 312         if (nd != NULL) {
 313                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
 314                 map->end = sym->end;
 315         }
 316 }
 317
 318 #define DSO__DELETED "(deleted)"
 319
 320 int map__load(struct map *map)
 321 {
 322         const char *name = map->dso->long_name;
 323         int nr;
 324
 325         if (dso__loaded(map->dso))
 326                 return 0;
 327
 328         nr = dso__load(map->dso, map);
 329         if (nr < 0) {
 330                 if (map->dso->has_build_id) {
 331                         char sbuild_id[SBUILD_ID_SIZE];
 332
 333                         build_id__sprintf(map->dso->build_id,
 334                                           sizeof(map->dso->build_id),
 335                                           sbuild_id);
 336                         pr_debug("%s with build id %s not found", name, sbuild_id);
 337                 } else
 338                         pr_debug("Failed to open %s", name);
 339
 340                 pr_debug(", continuing without symbols\n");
 341                 return -1;
 342         } else if (nr == 0) {
 343 #ifdef HAVE_LIBELF_SUPPORT
 344                 const size_t len = strlen(name);
 345                 const size_t real_len = len - sizeof(DSO__DELETED);
 346
 347                 if (len > sizeof(DSO__DELETED) &&
 348                     strcmp(name + real_len + 1, DSO__DELETED) == 0) {
 349                         pr_debug("%.*s was updated (is prelink enabled?). "
 350                                 "Restart the long running apps that use it!\n",
 351                                    (int)real_len, name);
 352                 } else {
 353                         pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
 354                 }
 355 #endif
 356                 return -1;
 357         }
 358
 359         return 0;
 360 }
 361
 362 struct symbol *map__find_symbol(struct map *map, u64 addr)
 363 {
 364         if (map__load(map) < 0)
 365                 return NULL;
 366
 367         return dso__find_symbol(map->dso, addr);
 368 }
 369
 370 struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
 371 {
 372         if (map__load(map) < 0)
 373                 return NULL;
 374
 375         if (!dso__sorted_by_name(map->dso))
 376                 dso__sort_by_name(map->dso);
 377
 378         return dso__find_symbol_by_name(map->dso, name);
 379 }
 380
 381 struct map *map__clone(struct map *from)
 382 {
 383         size_t size = sizeof(struct map);
 384         struct map *map;
 385
 386         if (from->dso && from->dso->kernel)
 387                 size += sizeof(struct kmap);
 388
 389         map = memdup(from, size);
 390         if (map != NULL) {
 391                 refcount_set(&map->refcnt, 1);
 392                 RB_CLEAR_NODE(&map->rb_node);
 393                 dso__get(map->dso);
 394         }
 395
 396         return map;
 397 }
 398
 399 size_t map__fprintf(struct map *map, FILE *fp)
 400 {
 401         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
 402                        map->start, map->end, map->pgoff, map->dso->name);
 403 }
 404
 405 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
 406 {
 407         char buf[symbol_conf.pad_output_len_dso + 1];
 408         const char *dsoname = "[unknown]";
 409
 410         if (map && map->dso) {
 411                 if (symbol_conf.show_kernel_path && map->dso->long_name)
 412                         dsoname = map->dso->long_name;
 413                 else
 414                         dsoname = map->dso->name;
 415         }
 416
 417         if (symbol_conf.pad_output_len_dso) {
 418                 scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
 419                 dsoname = buf;
 420         }
 421
 422         return fprintf(fp, "%s", dsoname);
 423 }
 424
 425 char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
 426 {
 427         if (map == NULL)
 428                 return SRCLINE_UNKNOWN;
 429         return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr);
 430 }
 431
 432 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
 433                          FILE *fp)
 434 {
 435         int ret = 0;
 436
 437         if (map && map->dso) {
 438                 char *srcline = map__srcline(map, addr, NULL);
 439                 if (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)
 440                         ret = fprintf(fp, "%s%s", prefix, srcline);
 441                 free_srcline(srcline);
 442         }
 443         return ret;
 444 }
 445
 446 void srccode_state_free(struct srccode_state *state)
 447 {
 448         zfree(&state->srcfile);
 449         state->line = 0;
 450 }
 451
 452 /**
 453  * map__rip_2objdump - convert symbol start address to objdump address.
 454  * @map: memory map
 455  * @rip: symbol start address
 456  *
 457  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
 458  * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
 459  * relative to section start.
 460  *
 461  * Return: Address suitable for passing to "objdump --start-address="
 462  */
 463 u64 map__rip_2objdump(struct map *map, u64 rip)
 464 {
 465         struct kmap *kmap = __map__kmap(map);
 466
 467         /*
 468          * vmlinux does not have program headers for PTI entry trampolines and
 469          * kcore may not either. However the trampoline object code is on the
 470          * main kernel map, so just use that instead.
 471          */
 472         if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
 473                 struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
 474
 475                 if (kernel_map)
 476                         map = kernel_map;
 477         }
 478
 479         if (!map->dso->adjust_symbols)
 480                 return rip;
 481
 482         if (map->dso->rel)
 483                 return rip - map->pgoff;
 484
 485         /*
 486          * kernel modules also have DSO_TYPE_USER in dso->kernel,
 487          * but all kernel modules are ET_REL, so won't get here.
 488          */
 489         if (map->dso->kernel == DSO_SPACE__USER)
 490                 return rip + map->dso->text_offset;
 491
 492         return map->unmap_ip(map, rip) - map->reloc;
 493 }
 494
 495 /**
 496  * map__objdump_2mem - convert objdump address to a memory address.
 497  * @map: memory map
 498  * @ip: objdump address
 499  *
 500  * Closely related to map__rip_2objdump(), this function takes an address from
 501  * objdump and converts it to a memory address.  Note this assumes that @map
 502  * contains the address.  To be sure the result is valid, check it forwards
 503  * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
 504  *
 505  * Return: Memory address.
 506  */
 507 u64 map__objdump_2mem(struct map *map, u64 ip)
 508 {
 509         if (!map->dso->adjust_symbols)
 510                 return map->unmap_ip(map, ip);
 511
 512         if (map->dso->rel)
 513                 return map->unmap_ip(map, ip + map->pgoff);
 514
 515         /*
 516          * kernel modules also have DSO_TYPE_USER in dso->kernel,
 517          * but all kernel modules are ET_REL, so won't get here.
 518          */
 519         if (map->dso->kernel == DSO_SPACE__USER)
 520                 return map->unmap_ip(map, ip - map->dso->text_offset);
 521
 522         return ip + map->reloc;
 523 }
 524
 525 void maps__init(struct maps *maps, struct machine *machine)
 526 {
 527         maps->entries = RB_ROOT;
 528         init_rwsem(&maps->lock);
 529         maps->machine = machine;
 530         maps->last_search_by_name = NULL;
 531         maps->nr_maps = 0;
 532         maps->maps_by_name = NULL;
 533         refcount_set(&maps->refcnt, 1);
 534 }
 535
 536 static void __maps__free_maps_by_name(struct maps *maps)
 537 {
 538         /*
 539          * Free everything to try to do it from the rbtree in the next search
 540          */
 541         zfree(&maps->maps_by_name);
 542         maps->nr_maps_allocated = 0;
 543 }
 544
 545 void maps__insert(struct maps *maps, struct map *map)
 546 {
 547         down_write(&maps->lock);
 548         __maps__insert(maps, map);
 549         ++maps->nr_maps;
 550
 551         if (map->dso && map->dso->kernel) {
 552                 struct kmap *kmap = map__kmap(map);
 553
 554                 if (kmap)
 555                         kmap->kmaps = maps;
 556                 else
 557                         pr_err("Internal error: kernel dso with non kernel map\n");
 558         }
 559
 560
 561         /*
 562          * If we already performed some search by name, then we need to add the just
 563          * inserted map and resort.
 564          */
 565         if (maps->maps_by_name) {
 566                 if (maps->nr_maps > maps->nr_maps_allocated) {
 567                         int nr_allocate = maps->nr_maps * 2;
 568                         struct map **maps_by_name = realloc(maps->maps_by_name, nr_allocate * sizeof(map));
 569
 570                         if (maps_by_name == NULL) {
 571                                 __maps__free_maps_by_name(maps);
 572                                 up_write(&maps->lock);
 573                                 return;
 574                         }
 575
 576                         maps->maps_by_name = maps_by_name;
 577                         maps->nr_maps_allocated = nr_allocate;
 578                 }
 579                 maps->maps_by_name[maps->nr_maps - 1] = map;
 580                 __maps__sort_by_name(maps);
 581         }
 582         up_write(&maps->lock);
 583 }
 584
 585 static void __maps__remove(struct maps *maps, struct map *map)
 586 {
 587         rb_erase_init(&map->rb_node, &maps->entries);
 588         map__put(map);
 589 }
 590
 591 void maps__remove(struct maps *maps, struct map *map)
 592 {
 593         down_write(&maps->lock);
 594         if (maps->last_search_by_name == map)
 595                 maps->last_search_by_name = NULL;
 596
 597         __maps__remove(maps, map);
 598         --maps->nr_maps;
 599         if (maps->maps_by_name)
 600                 __maps__free_maps_by_name(maps);
 601         up_write(&maps->lock);
 602 }
 603
 604 static void __maps__purge(struct maps *maps)
 605 {
 606         struct map *pos, *next;
 607
 608         maps__for_each_entry_safe(maps, pos, next) {
 609                 rb_erase_init(&pos->rb_node,  &maps->entries);
 610                 map__put(pos);
 611         }
 612 }
 613
 614 void maps__exit(struct maps *maps)
 615 {
 616         down_write(&maps->lock);
 617         __maps__purge(maps);
 618         up_write(&maps->lock);
 619 }
 620
 621 bool maps__empty(struct maps *maps)
 622 {
 623         return !maps__first(maps);
 624 }
 625
 626 struct maps *maps__new(struct machine *machine)
 627 {
 628         struct maps *maps = zalloc(sizeof(*maps));
 629
 630         if (maps != NULL)
 631                 maps__init(maps, machine);
 632
 633         return maps;
 634 }
 635
 636 void maps__delete(struct maps *maps)
 637 {
 638         maps__exit(maps);
 639         unwind__finish_access(maps);
 640         free(maps);
 641 }
 642
 643 void maps__put(struct maps *maps)
 644 {
 645         if (maps && refcount_dec_and_test(&maps->refcnt))
 646                 maps__delete(maps);
 647 }
 648
 649 struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
 650 {
 651         struct map *map = maps__find(maps, addr);
 652
 653         /* Ensure map is loaded before using map->map_ip */
 654         if (map != NULL && map__load(map) >= 0) {
 655                 if (mapp != NULL)
 656                         *mapp = map;
 657                 return map__find_symbol(map, map->map_ip(map, addr));
 658         }
 659
 660         return NULL;
 661 }
 662
 663 static bool map__contains_symbol(struct map *map, struct symbol *sym)
 664 {
 665         u64 ip = map->unmap_ip(map, sym->start);
 666
 667         return ip >= map->start && ip < map->end;
 668 }
 669
 670 struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, struct map **mapp)
 671 {
 672         struct symbol *sym;
 673         struct map *pos;
 674
 675         down_read(&maps->lock);
 676
 677         maps__for_each_entry(maps, pos) {
 678                 sym = map__find_symbol_by_name(pos, name);
 679
 680                 if (sym == NULL)
 681                         continue;
 682                 if (!map__contains_symbol(pos, sym)) {
 683                         sym = NULL;
 684                         continue;
 685                 }
 686                 if (mapp != NULL)
 687                         *mapp = pos;
 688                 goto out;
 689         }
 690
 691         sym = NULL;
 692 out:
 693         up_read(&maps->lock);
 694         return sym;
 695 }
 696
 697 int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
 698 {
 699         if (ams->addr < ams->ms.map->start || ams->addr >= ams->ms.map->end) {
 700                 if (maps == NULL)
 701                         return -1;
 702                 ams->ms.map = maps__find(maps, ams->addr);
 703                 if (ams->ms.map == NULL)
 704                         return -1;
 705         }
 706
 707         ams->al_addr = ams->ms.map->map_ip(ams->ms.map, ams->addr);
 708         ams->ms.sym = map__find_symbol(ams->ms.map, ams->al_addr);
 709
 710         return ams->ms.sym ? 0 : -1;
 711 }
 712
 713 size_t maps__fprintf(struct maps *maps, FILE *fp)
 714 {
 715         size_t printed = 0;
 716         struct map *pos;
 717
 718         down_read(&maps->lock);
 719
 720         maps__for_each_entry(maps, pos) {
 721                 printed += fprintf(fp, "Map:");
 722                 printed += map__fprintf(pos, fp);
 723                 if (verbose > 2) {
 724                         printed += dso__fprintf(pos->dso, fp);
 725                         printed += fprintf(fp, "--\n");
 726                 }
 727         }
 728
 729         up_read(&maps->lock);
 730
 731         return printed;
 732 }
 733
 734 int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
 735 {
 736         struct rb_root *root;
 737         struct rb_node *next, *first;
 738         int err = 0;
 739
 740         down_write(&maps->lock);
 741
 742         root = &maps->entries;
 743
 744         /*
 745          * Find first map where end > map->start.
 746          * Same as find_vma() in kernel.
 747          */
 748         next = root->rb_node;
 749         first = NULL;
 750         while (next) {
 751                 struct map *pos = rb_entry(next, struct map, rb_node);
 752
 753                 if (pos->end > map->start) {
 754                         first = next;
 755                         if (pos->start <= map->start)
 756                                 break;
 757                         next = next->rb_left;
 758                 } else
 759                         next = next->rb_right;
 760         }
 761
 762         next = first;
 763         while (next) {
 764                 struct map *pos = rb_entry(next, struct map, rb_node);
 765                 next = rb_next(&pos->rb_node);
 766
 767                 /*
 768                  * Stop if current map starts after map->end.
 769                  * Maps are ordered by start: next will not overlap for sure.
 770                  */
 771                 if (pos->start >= map->end)
 772                         break;
 773
 774                 if (verbose >= 2) {
 775
 776                         if (use_browser) {
 777                                 pr_debug("overlapping maps in %s (disable tui for more info)\n",
 778                                            map->dso->name);
 779                         } else {
 780                                 fputs("overlapping maps:\n", fp);
 781                                 map__fprintf(map, fp);
 782                                 map__fprintf(pos, fp);
 783                         }
 784                 }
 785
 786                 rb_erase_init(&pos->rb_node, root);
 787                 /*
 788                  * Now check if we need to create new maps for areas not
 789                  * overlapped by the new map:
 790                  */
 791                 if (map->start > pos->start) {
 792                         struct map *before = map__clone(pos);
 793
 794                         if (before == NULL) {
 795                                 err = -ENOMEM;
 796                                 goto put_map;
 797                         }
 798
 799                         before->end = map->start;
 800                         __maps__insert(maps, before);
 801                         if (verbose >= 2 && !use_browser)
 802                                 map__fprintf(before, fp);
 803                         map__put(before);
 804                 }
 805
 806                 if (map->end < pos->end) {
 807                         struct map *after = map__clone(pos);
 808
 809                         if (after == NULL) {
 810                                 err = -ENOMEM;
 811                                 goto put_map;
 812                         }
 813
 814                         after->start = map->end;
 815                         after->pgoff += map->end - pos->start;
 816                         assert(pos->map_ip(pos, map->end) == after->map_ip(after, map->end));
 817                         __maps__insert(maps, after);
 818                         if (verbose >= 2 && !use_browser)
 819                                 map__fprintf(after, fp);
 820                         map__put(after);
 821                 }
 822 put_map:
 823                 map__put(pos);
 824
 825                 if (err)
 826                         goto out;
 827         }
 828
 829         err = 0;
 830 out:
 831         up_write(&maps->lock);
 832         return err;
 833 }
 834
 835 /*
 836  * XXX This should not really _copy_ te maps, but refcount them.
 837  */
 838 int maps__clone(struct thread *thread, struct maps *parent)
 839 {
 840         struct maps *maps = thread->maps;
 841         int err = -ENOMEM;
 842         struct map *map;
 843
 844         down_read(&parent->lock);
 845
 846         maps__for_each_entry(parent, map) {
 847                 struct map *new = map__clone(map);
 848                 if (new == NULL)
 849                         goto out_unlock;
 850
 851                 err = unwind__prepare_access(maps, new, NULL);
 852                 if (err)
 853                         goto out_unlock;
 854
 855                 maps__insert(maps, new);
 856                 map__put(new);
 857         }
 858
 859         err = 0;
 860 out_unlock:
 861         up_read(&parent->lock);
 862         return err;
 863 }
 864
 865 static void __maps__insert(struct maps *maps, struct map *map)
 866 {
 867         struct rb_node **p = &maps->entries.rb_node;
 868         struct rb_node *parent = NULL;
 869         const u64 ip = map->start;
 870         struct map *m;
 871
 872         while (*p != NULL) {
 873                 parent = *p;
 874                 m = rb_entry(parent, struct map, rb_node);
 875                 if (ip < m->start)
 876                         p = &(*p)->rb_left;
 877                 else
 878                         p = &(*p)->rb_right;
 879         }
 880
 881         rb_link_node(&map->rb_node, parent, p);
 882         rb_insert_color(&map->rb_node, &maps->entries);
 883         map__get(map);
 884 }
 885
 886 struct map *maps__find(struct maps *maps, u64 ip)
 887 {
 888         struct rb_node *p;
 889         struct map *m;
 890
 891         down_read(&maps->lock);
 892
 893         p = maps->entries.rb_node;
 894         while (p != NULL) {
 895                 m = rb_entry(p, struct map, rb_node);
 896                 if (ip < m->start)
 897                         p = p->rb_left;
 898                 else if (ip >= m->end)
 899                         p = p->rb_right;
 900                 else
 901                         goto out;
 902         }
 903
 904         m = NULL;
 905 out:
 906         up_read(&maps->lock);
 907         return m;
 908 }
 909
 910 struct map *maps__first(struct maps *maps)
 911 {
 912         struct rb_node *first = rb_first(&maps->entries);
 913
 914         if (first)
 915                 return rb_entry(first, struct map, rb_node);
 916         return NULL;
 917 }
 918
 919 static struct map *__map__next(struct map *map)
 920 {
 921         struct rb_node *next = rb_next(&map->rb_node);
 922
 923         if (next)
 924                 return rb_entry(next, struct map, rb_node);
 925         return NULL;
 926 }
 927
 928 struct map *map__next(struct map *map)
 929 {
 930         return map ? __map__next(map) : NULL;
 931 }
 932
 933 struct kmap *__map__kmap(struct map *map)
 934 {
 935         if (!map->dso || !map->dso->kernel)
 936                 return NULL;
 937         return (struct kmap *)(map + 1);
 938 }
 939
 940 struct kmap *map__kmap(struct map *map)
 941 {
 942         struct kmap *kmap = __map__kmap(map);
 943
 944         if (!kmap)
 945                 pr_err("Internal error: map__kmap with a non-kernel map\n");
 946         return kmap;
 947 }
 948
 949 struct maps *map__kmaps(struct map *map)
 950 {
 951         struct kmap *kmap = map__kmap(map);
 952
 953         if (!kmap || !kmap->kmaps) {
 954                 pr_err("Internal error: map__kmaps with a non-kernel map\n");
 955                 return NULL;
 956         }
 957         return kmap->kmaps;
 958 }