1// SPDX-License-Identifier: GPL-2.0 2#include <inttypes.h> 3#include <limits.h> 4#include <stdio.h> 5#include <stdlib.h> 6#include <string.h> 7#include <linux/string.h> 8#include <linux/zalloc.h> 9#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */ 10#include "debug.h" 11#include "dso.h" 12#include "map.h" 13#include "namespaces.h" 14#include "srcline.h" 15#include "symbol.h" 16#include "thread.h" 17#include "vdso.h" 18 19static inline int is_android_lib(const char *filename) 20{ 21 return strstarts(filename, "/data/app-lib/") || 22 strstarts(filename, "/system/lib/"); 23} 24 25static inline bool replace_android_lib(const char *filename, char *newfilename) 26{ 27 const char *libname; 28 char *app_abi; 29 size_t app_abi_length, new_length; 30 size_t lib_length = 0; 31 32 libname = strrchr(filename, '/'); 33 if (libname) 34 lib_length = strlen(libname); 35 36 app_abi = getenv("APP_ABI"); 37 if (!app_abi) 38 return false; 39 40 app_abi_length = strlen(app_abi); 41 42 if (strstarts(filename, "/data/app-lib/")) { 43 char *apk_path; 44 45 if (!app_abi_length) 46 return false; 47 48 new_length = 7 + app_abi_length + lib_length; 49 50 apk_path = getenv("APK_PATH"); 51 if (apk_path) { 52 new_length += strlen(apk_path) + 1; 53 if (new_length > PATH_MAX) 54 return false; 55 snprintf(newfilename, new_length, 56 "%s/libs/%s/%s", apk_path, app_abi, libname); 57 } else { 58 if (new_length > PATH_MAX) 59 return false; 60 snprintf(newfilename, new_length, 61 "libs/%s/%s", app_abi, libname); 62 } 63 return true; 64 } 65 66 if (strstarts(filename, "/system/lib/")) { 67 char *ndk, *app; 68 const char *arch; 69 int ndk_length, app_length; 70 71 ndk = getenv("NDK_ROOT"); 72 app = getenv("APP_PLATFORM"); 73 74 if (!(ndk && app)) 75 return false; 76 77 ndk_length = strlen(ndk); 78 app_length = strlen(app); 79 80 if (!(ndk_length && app_length && app_abi_length)) 81 return false; 82 83 arch = !strncmp(app_abi, "arm", 3) ? "arm" : 84 !strncmp(app_abi, "mips", 4) ? "mips" : 85 !strncmp(app_abi, "x86", 3) ? "x86" : NULL; 86 87 if (!arch) 88 return false; 89 90 new_length = 27 + ndk_length + 91 app_length + lib_length 92 + strlen(arch); 93 94 if (new_length > PATH_MAX) 95 return false; 96 snprintf(newfilename, new_length, 97 "%.*s/platforms/%.*s/arch-%s/usr/lib/%s", 98 ndk_length, ndk, app_length, app, arch, libname); 99 100 return true; 101 } 102 return false; 103} 104 105void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso) 106{ 107 map__set_start(map, start); 108 map__set_end(map, end); 109 map__set_pgoff(map, pgoff); 110 map__set_reloc(map, 0); 111 map__set_dso(map, dso__get(dso)); 112 map__set_mapping_type(map, MAPPING_TYPE__DSO); 113 map__set_erange_warned(map, false); 114 refcount_set(map__refcnt(map), 1); 115} 116 117struct map *map__new(struct machine *machine, u64 start, u64 len, 118 u64 pgoff, struct dso_id *id, 119 u32 prot, u32 flags, struct build_id *bid, 120 char *filename, struct thread *thread) 121{ 122 struct map *result; 123 RC_STRUCT(map) *map; 124 struct nsinfo *nsi = NULL; 125 struct nsinfo *nnsi; 126 127 map = malloc(sizeof(*map)); 128 if (ADD_RC_CHK(result, map)) { 129 char newfilename[PATH_MAX]; 130 struct dso *dso, *header_bid_dso; 131 int anon, no_dso, vdso, android; 132 133 android = is_android_lib(filename); 134 anon = is_anon_memory(filename) || flags & MAP_HUGETLB; 135 vdso = is_vdso_map(filename); 136 no_dso = is_no_dso_memory(filename); 137 map->prot = prot; 138 map->flags = flags; 139 nsi = nsinfo__get(thread__nsinfo(thread)); 140 141 if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) { 142 snprintf(newfilename, sizeof(newfilename), 143 "/tmp/perf-%d.map", nsinfo__pid(nsi)); 144 filename = newfilename; 145 } 146 147 if (android) { 148 if (replace_android_lib(filename, newfilename)) 149 filename = newfilename; 150 } 151 152 if (vdso) { 153 /* The vdso maps are always on the host and not the 154 * container. Ensure that we don't use setns to look 155 * them up. 156 */ 157 nnsi = nsinfo__copy(nsi); 158 if (nnsi) { 159 nsinfo__put(nsi); 160 nsinfo__clear_need_setns(nnsi); 161 nsi = nnsi; 162 } 163 pgoff = 0; 164 dso = machine__findnew_vdso(machine, thread); 165 } else 166 dso = machine__findnew_dso_id(machine, filename, id); 167 168 if (dso == NULL) 169 goto out_delete; 170 171 assert(!dso->kernel); 172 map__init(result, start, start + len, pgoff, dso); 173 174 if (anon || no_dso) { 175 map->mapping_type = MAPPING_TYPE__IDENTITY; 176 177 /* 178 * Set memory without DSO as loaded. All map__find_* 179 * functions still return NULL, and we avoid the 180 * unnecessary map__load warning. 181 */ 182 if (!(prot & PROT_EXEC)) 183 dso__set_loaded(dso); 184 } 185 mutex_lock(&dso->lock); 186 nsinfo__put(dso->nsinfo); 187 dso->nsinfo = nsi; 188 mutex_unlock(&dso->lock); 189 190 if (build_id__is_defined(bid)) { 191 dso__set_build_id(dso, bid); 192 } else { 193 /* 194 * If the mmap event had no build ID, search for an existing dso from the 195 * build ID header by name. Otherwise only the dso loaded at the time of 196 * reading the header will have the build ID set and all future mmaps will 197 * have it missing. 198 */ 199 down_read(&machine->dsos.lock); 200 header_bid_dso = __dsos__find(&machine->dsos, filename, false); 201 up_read(&machine->dsos.lock); 202 if (header_bid_dso && header_bid_dso->header_build_id) { 203 dso__set_build_id(dso, &header_bid_dso->bid); 204 dso->header_build_id = 1; 205 } 206 } 207 dso__put(dso); 208 } 209 return result; 210out_delete: 211 nsinfo__put(nsi); 212 RC_CHK_FREE(result); 213 return NULL; 214} 215 216/* 217 * Constructor variant for modules (where we know from /proc/modules where 218 * they are loaded) and for vmlinux, where only after we load all the 219 * symbols we'll know where it starts and ends. 220 */ 221struct map *map__new2(u64 start, struct dso *dso) 222{ 223 struct map *result; 224 RC_STRUCT(map) *map; 225 226 map = calloc(1, sizeof(*map) + (dso->kernel ? sizeof(struct kmap) : 0)); 227 if (ADD_RC_CHK(result, map)) { 228 /* 229 * ->end will be filled after we load all the symbols 230 */ 231 map__init(result, start, 0, 0, dso); 232 } 233 234 return result; 235} 236 237bool __map__is_kernel(const struct map *map) 238{ 239 if (!map__dso(map)->kernel) 240 return false; 241 return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map; 242} 243 244bool __map__is_extra_kernel_map(const struct map *map) 245{ 246 struct kmap *kmap = __map__kmap((struct map *)map); 247 248 return kmap && kmap->name[0]; 249} 250 251bool __map__is_bpf_prog(const struct map *map) 252{ 253 const char *name; 254 struct dso *dso = map__dso(map); 255 256 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO) 257 return true; 258 259 /* 260 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have 261 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can 262 * guess the type based on name. 263 */ 264 name = dso->short_name; 265 return name && (strstr(name, "bpf_prog_") == name); 266} 267 268bool __map__is_bpf_image(const struct map *map) 269{ 270 const char *name; 271 struct dso *dso = map__dso(map); 272 273 if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE) 274 return true; 275 276 /* 277 * If PERF_RECORD_KSYMBOL is not included, the dso will not have 278 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can 279 * guess the type based on name. 280 */ 281 name = dso->short_name; 282 return name && is_bpf_image(name); 283} 284 285bool __map__is_ool(const struct map *map) 286{ 287 const struct dso *dso = map__dso(map); 288 289 return dso && dso->binary_type == DSO_BINARY_TYPE__OOL; 290} 291 292bool map__has_symbols(const struct map *map) 293{ 294 return dso__has_symbols(map__dso(map)); 295} 296 297static void map__exit(struct map *map) 298{ 299 BUG_ON(refcount_read(map__refcnt(map)) != 0); 300 dso__zput(RC_CHK_ACCESS(map)->dso); 301} 302 303void map__delete(struct map *map) 304{ 305 map__exit(map); 306 RC_CHK_FREE(map); 307} 308 309void map__put(struct map *map) 310{ 311 if (map && refcount_dec_and_test(map__refcnt(map))) 312 map__delete(map); 313 else 314 RC_CHK_PUT(map); 315} 316 317void map__fixup_start(struct map *map) 318{ 319 struct dso *dso = map__dso(map); 320 struct rb_root_cached *symbols = &dso->symbols; 321 struct rb_node *nd = rb_first_cached(symbols); 322 323 if (nd != NULL) { 324 struct symbol *sym = rb_entry(nd, struct symbol, rb_node); 325 326 map__set_start(map, sym->start); 327 } 328} 329 330void map__fixup_end(struct map *map) 331{ 332 struct dso *dso = map__dso(map); 333 struct rb_root_cached *symbols = &dso->symbols; 334 struct rb_node *nd = rb_last(&symbols->rb_root); 335 336 if (nd != NULL) { 337 struct symbol *sym = rb_entry(nd, struct symbol, rb_node); 338 map__set_end(map, sym->end); 339 } 340} 341 342#define DSO__DELETED "(deleted)" 343 344int map__load(struct map *map) 345{ 346 struct dso *dso = map__dso(map); 347 const char *name = dso->long_name; 348 int nr; 349 350 if (dso__loaded(dso)) 351 return 0; 352 353 nr = dso__load(dso, map); 354 if (nr < 0) { 355 if (dso->has_build_id) { 356 char sbuild_id[SBUILD_ID_SIZE]; 357 358 build_id__sprintf(&dso->bid, sbuild_id); 359 pr_debug("%s with build id %s not found", name, sbuild_id); 360 } else 361 pr_debug("Failed to open %s", name); 362 363 pr_debug(", continuing without symbols\n"); 364 return -1; 365 } else if (nr == 0) { 366#ifdef HAVE_LIBELF_SUPPORT 367 const size_t len = strlen(name); 368 const size_t real_len = len - sizeof(DSO__DELETED); 369 370 if (len > sizeof(DSO__DELETED) && 371 strcmp(name + real_len + 1, DSO__DELETED) == 0) { 372 pr_debug("%.*s was updated (is prelink enabled?). " 373 "Restart the long running apps that use it!\n", 374 (int)real_len, name); 375 } else { 376 pr_debug("no symbols found in %s, maybe install a debug package?\n", name); 377 } 378#endif 379 return -1; 380 } 381 382 return 0; 383} 384 385struct symbol *map__find_symbol(struct map *map, u64 addr) 386{ 387 if (map__load(map) < 0) 388 return NULL; 389 390 return dso__find_symbol(map__dso(map), addr); 391} 392 393struct symbol *map__find_symbol_by_name_idx(struct map *map, const char *name, size_t *idx) 394{ 395 struct dso *dso; 396 397 if (map__load(map) < 0) 398 return NULL; 399 400 dso = map__dso(map); 401 dso__sort_by_name(dso); 402 403 return dso__find_symbol_by_name(dso, name, idx); 404} 405 406struct symbol *map__find_symbol_by_name(struct map *map, const char *name) 407{ 408 size_t idx; 409 410 return map__find_symbol_by_name_idx(map, name, &idx); 411} 412 413struct map *map__clone(struct map *from) 414{ 415 struct map *result; 416 RC_STRUCT(map) *map; 417 size_t size = sizeof(RC_STRUCT(map)); 418 struct dso *dso = map__dso(from); 419 420 if (dso && dso->kernel) 421 size += sizeof(struct kmap); 422 423 map = memdup(RC_CHK_ACCESS(from), size); 424 if (ADD_RC_CHK(result, map)) { 425 refcount_set(&map->refcnt, 1); 426 map->dso = dso__get(dso); 427 } 428 429 return result; 430} 431 432size_t map__fprintf(struct map *map, FILE *fp) 433{ 434 const struct dso *dso = map__dso(map); 435 436 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n", 437 map__start(map), map__end(map), map__pgoff(map), dso->name); 438} 439 440static bool prefer_dso_long_name(const struct dso *dso, bool print_off) 441{ 442 return dso->long_name && 443 (symbol_conf.show_kernel_path || 444 (print_off && (dso->name[0] == '[' || dso__is_kcore(dso)))); 445} 446 447static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp) 448{ 449 char buf[symbol_conf.pad_output_len_dso + 1]; 450 const char *dsoname = "[unknown]"; 451 const struct dso *dso = map ? map__dso(map) : NULL; 452 453 if (dso) { 454 if (prefer_dso_long_name(dso, print_off)) 455 dsoname = dso->long_name; 456 else 457 dsoname = dso->name; 458 } 459 460 if (symbol_conf.pad_output_len_dso) { 461 scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname); 462 dsoname = buf; 463 } 464 465 return fprintf(fp, "%s", dsoname); 466} 467 468size_t map__fprintf_dsoname(struct map *map, FILE *fp) 469{ 470 return __map__fprintf_dsoname(map, false, fp); 471} 472 473size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp) 474{ 475 const struct dso *dso = map ? map__dso(map) : NULL; 476 int printed = 0; 477 478 if (print_off && (!dso || !dso__is_object_file(dso))) 479 print_off = false; 480 printed += fprintf(fp, " ("); 481 printed += __map__fprintf_dsoname(map, print_off, fp); 482 if (print_off) 483 printed += fprintf(fp, "+0x%" PRIx64, addr); 484 printed += fprintf(fp, ")"); 485 486 return printed; 487} 488 489char *map__srcline(struct map *map, u64 addr, struct symbol *sym) 490{ 491 if (map == NULL) 492 return SRCLINE_UNKNOWN; 493 494 return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr); 495} 496 497int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix, 498 FILE *fp) 499{ 500 const struct dso *dso = map ? map__dso(map) : NULL; 501 int ret = 0; 502 503 if (dso) { 504 char *srcline = map__srcline(map, addr, NULL); 505 if (srcline != SRCLINE_UNKNOWN) 506 ret = fprintf(fp, "%s%s", prefix, srcline); 507 zfree_srcline(&srcline); 508 } 509 return ret; 510} 511 512void srccode_state_free(struct srccode_state *state) 513{ 514 zfree(&state->srcfile); 515 state->line = 0; 516} 517 518/** 519 * map__rip_2objdump - convert symbol start address to objdump address. 520 * @map: memory map 521 * @rip: symbol start address 522 * 523 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN. 524 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is 525 * relative to section start. 526 * 527 * Return: Address suitable for passing to "objdump --start-address=" 528 */ 529u64 map__rip_2objdump(struct map *map, u64 rip) 530{ 531 struct kmap *kmap = __map__kmap(map); 532 const struct dso *dso = map__dso(map); 533 534 /* 535 * vmlinux does not have program headers for PTI entry trampolines and 536 * kcore may not either. However the trampoline object code is on the 537 * main kernel map, so just use that instead. 538 */ 539 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps) { 540 struct machine *machine = maps__machine(kmap->kmaps); 541 542 if (machine) { 543 struct map *kernel_map = machine__kernel_map(machine); 544 545 if (kernel_map) 546 map = kernel_map; 547 } 548 } 549 550 if (!dso->adjust_symbols) 551 return rip; 552 553 if (dso->rel) 554 return rip - map__pgoff(map); 555 556 if (dso->kernel == DSO_SPACE__USER) 557 return rip + dso->text_offset; 558 559 return map__unmap_ip(map, rip) - map__reloc(map); 560} 561 562/** 563 * map__objdump_2mem - convert objdump address to a memory address. 564 * @map: memory map 565 * @ip: objdump address 566 * 567 * Closely related to map__rip_2objdump(), this function takes an address from 568 * objdump and converts it to a memory address. Note this assumes that @map 569 * contains the address. To be sure the result is valid, check it forwards 570 * e.g. map__rip_2objdump(map__map_ip(map, map__objdump_2mem(map, ip))) == ip 571 * 572 * Return: Memory address. 573 */ 574u64 map__objdump_2mem(struct map *map, u64 ip) 575{ 576 const struct dso *dso = map__dso(map); 577 578 if (!dso->adjust_symbols) 579 return map__unmap_ip(map, ip); 580 581 if (dso->rel) 582 return map__unmap_ip(map, ip + map__pgoff(map)); 583 584 if (dso->kernel == DSO_SPACE__USER) 585 return map__unmap_ip(map, ip - dso->text_offset); 586 587 return ip + map__reloc(map); 588} 589 590bool map__contains_symbol(const struct map *map, const struct symbol *sym) 591{ 592 u64 ip = map__unmap_ip(map, sym->start); 593 594 return ip >= map__start(map) && ip < map__end(map); 595} 596 597struct kmap *__map__kmap(struct map *map) 598{ 599 const struct dso *dso = map__dso(map); 600 601 if (!dso || !dso->kernel) 602 return NULL; 603 return (struct kmap *)(&RC_CHK_ACCESS(map)[1]); 604} 605 606struct kmap *map__kmap(struct map *map) 607{ 608 struct kmap *kmap = __map__kmap(map); 609 610 if (!kmap) 611 pr_err("Internal error: map__kmap with a non-kernel map\n"); 612 return kmap; 613} 614 615struct maps *map__kmaps(struct map *map) 616{ 617 struct kmap *kmap = map__kmap(map); 618 619 if (!kmap || !kmap->kmaps) { 620 pr_err("Internal error: map__kmaps with a non-kernel map\n"); 621 return NULL; 622 } 623 return kmap->kmaps; 624} 625