1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * build-id.c 4 * 5 * build-id support 6 * 7 * Copyright (C) 2009, 2010 Red Hat Inc. 8 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com> 9 */ 10 #include "util.h" // lsdir(), mkdir_p(), rm_rf() 11 #include <dirent.h> 12 #include <errno.h> 13 #include <stdio.h> 14 #include <sys/stat.h> 15 #include <sys/types.h> 16 #include "util/copyfile.h" 17 #include "dso.h" 18 #include "build-id.h" 19 #include "event.h" 20 #include "namespaces.h" 21 #include "map.h" 22 #include "symbol.h" 23 #include "thread.h" 24 #include <linux/kernel.h> 25 #include "debug.h" 26 #include "session.h" 27 #include "tool.h" 28 #include "header.h" 29 #include "vdso.h" 30 #include "path.h" 31 #include "probe-file.h" 32 #include "strlist.h" 33 34 #ifdef HAVE_DEBUGINFOD_SUPPORT 35 #include <elfutils/debuginfod.h> 36 #endif 37 38 #include <linux/ctype.h> 39 #include <linux/zalloc.h> 40 #include <asm/bug.h> 41 42 static bool no_buildid_cache; 43 44 int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, 45 union perf_event *event, 46 struct perf_sample *sample, 47 struct evsel *evsel __maybe_unused, 48 struct machine *machine) 49 { 50 struct addr_location al; 51 struct thread *thread = machine__findnew_thread(machine, sample->pid, 52 sample->tid); 53 54 if (thread == NULL) { 55 pr_err("problem processing %d event, skipping it.\n", 56 event->header.type); 57 return -1; 58 } 59 60 if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) 61 al.map->dso->hit = 1; 62 63 thread__put(thread); 64 return 0; 65 } 66 67 static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, 68 union perf_event *event, 69 struct perf_sample *sample 70 __maybe_unused, 71 struct machine *machine) 72 { 73 struct thread *thread = machine__findnew_thread(machine, 74 event->fork.pid, 75 event->fork.tid); 76 77 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, 78 event->fork.ppid, event->fork.ptid); 79 80 if (thread) { 81 machine__remove_thread(machine, thread); 82 thread__put(thread); 83 } 84 85 return 0; 86 } 87 88 struct perf_tool build_id__mark_dso_hit_ops = { 89 .sample = build_id__mark_dso_hit, 90 .mmap = perf_event__process_mmap, 91 .mmap2 = perf_event__process_mmap2, 92 .fork = perf_event__process_fork, 93 .exit = perf_event__exit_del_thread, 94 .attr = perf_event__process_attr, 95 .build_id = perf_event__process_build_id, 96 .ordered_events = true, 97 }; 98 99 int build_id__sprintf(const struct build_id *build_id, char *bf) 100 { 101 char *bid = bf; 102 const u8 *raw = build_id->data; 103 size_t i; 104 105 for (i = 0; i < build_id->size; ++i) { 106 sprintf(bid, "%02x", *raw); 107 ++raw; 108 bid += 2; 109 } 110 111 return (bid - bf) + 1; 112 } 113 114 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) 115 { 116 char notes[PATH_MAX]; 117 struct build_id bid; 118 int ret; 119 120 if (!root_dir) 121 root_dir = ""; 122 123 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); 124 125 ret = sysfs__read_build_id(notes, &bid); 126 if (ret < 0) 127 return ret; 128 129 return build_id__sprintf(&bid, sbuild_id); 130 } 131 132 int filename__sprintf_build_id(const char *pathname, char *sbuild_id) 133 { 134 struct build_id bid; 135 int ret; 136 137 ret = filename__read_build_id(pathname, &bid); 138 if (ret < 0) 139 return ret; 140 141 return build_id__sprintf(&bid, sbuild_id); 142 } 143 144 /* asnprintf consolidates asprintf and snprintf */ 145 static int asnprintf(char **strp, size_t size, const char *fmt, ...) 146 { 147 va_list ap; 148 int ret; 149 150 if (!strp) 151 return -EINVAL; 152 153 va_start(ap, fmt); 154 if (*strp) 155 ret = vsnprintf(*strp, size, fmt, ap); 156 else 157 ret = vasprintf(strp, fmt, ap); 158 va_end(ap); 159 160 return ret; 161 } 162 163 char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, 164 size_t size) 165 { 166 bool retry_old = true; 167 168 snprintf(bf, size, "%s/%s/%s/kallsyms", 169 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); 170 retry: 171 if (!access(bf, F_OK)) 172 return bf; 173 if (retry_old) { 174 /* Try old style kallsyms cache */ 175 snprintf(bf, size, "%s/%s/%s", 176 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); 177 retry_old = false; 178 goto retry; 179 } 180 181 return NULL; 182 } 183 184 char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) 185 { 186 char *tmp = bf; 187 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, 188 sbuild_id, sbuild_id + 2); 189 if (ret < 0 || (tmp && size < (unsigned int)ret)) 190 return NULL; 191 return bf; 192 } 193 194 /* The caller is responsible to free the returned buffer. */ 195 char *build_id_cache__origname(const char *sbuild_id) 196 { 197 char *linkname; 198 char buf[PATH_MAX]; 199 char *ret = NULL, *p; 200 size_t offs = 5; /* == strlen("../..") */ 201 ssize_t len; 202 203 linkname = build_id_cache__linkname(sbuild_id, NULL, 0); 204 if (!linkname) 205 return NULL; 206 207 len = readlink(linkname, buf, sizeof(buf) - 1); 208 if (len <= 0) 209 goto out; 210 buf[len] = '\0'; 211 212 /* The link should be "../..<origpath>/<sbuild_id>" */ 213 p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ 214 if (p && (p > buf + offs)) { 215 *p = '\0'; 216 if (buf[offs + 1] == '[') 217 offs++; /* 218 * This is a DSO name, like [kernel.kallsyms]. 219 * Skip the first '/', since this is not the 220 * cache of a regular file. 221 */ 222 ret = strdup(buf + offs); /* Skip "../..[/]" */ 223 } 224 out: 225 free(linkname); 226 return ret; 227 } 228 229 /* Check if the given build_id cache is valid on current running system */ 230 static bool build_id_cache__valid_id(char *sbuild_id) 231 { 232 char real_sbuild_id[SBUILD_ID_SIZE] = ""; 233 char *pathname; 234 int ret = 0; 235 bool result = false; 236 237 pathname = build_id_cache__origname(sbuild_id); 238 if (!pathname) 239 return false; 240 241 if (!strcmp(pathname, DSO__NAME_KALLSYMS)) 242 ret = sysfs__sprintf_build_id("/", real_sbuild_id); 243 else if (pathname[0] == '/') 244 ret = filename__sprintf_build_id(pathname, real_sbuild_id); 245 else 246 ret = -EINVAL; /* Should we support other special DSO cache? */ 247 if (ret >= 0) 248 result = (strcmp(sbuild_id, real_sbuild_id) == 0); 249 free(pathname); 250 251 return result; 252 } 253 254 static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, 255 bool is_debug) 256 { 257 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? 258 "debug" : "elf")); 259 } 260 261 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, 262 bool is_debug) 263 { 264 bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); 265 bool is_vdso = dso__is_vdso((struct dso *)dso); 266 char sbuild_id[SBUILD_ID_SIZE]; 267 char *linkname; 268 bool alloc = (bf == NULL); 269 int ret; 270 271 if (!dso->has_build_id) 272 return NULL; 273 274 build_id__sprintf(&dso->bid, sbuild_id); 275 linkname = build_id_cache__linkname(sbuild_id, NULL, 0); 276 if (!linkname) 277 return NULL; 278 279 /* Check if old style build_id cache */ 280 if (is_regular_file(linkname)) 281 ret = asnprintf(&bf, size, "%s", linkname); 282 else 283 ret = asnprintf(&bf, size, "%s/%s", linkname, 284 build_id_cache__basename(is_kallsyms, is_vdso, 285 is_debug)); 286 if (ret < 0 || (!alloc && size < (unsigned int)ret)) 287 bf = NULL; 288 free(linkname); 289 290 return bf; 291 } 292 293 #define dsos__for_each_with_build_id(pos, head) \ 294 list_for_each_entry(pos, head, node) \ 295 if (!pos->has_build_id) \ 296 continue; \ 297 else 298 299 static int write_buildid(const char *name, size_t name_len, struct build_id *bid, 300 pid_t pid, u16 misc, struct feat_fd *fd) 301 { 302 int err; 303 struct perf_record_header_build_id b; 304 size_t len; 305 306 len = name_len + 1; 307 len = PERF_ALIGN(len, NAME_ALIGN); 308 309 memset(&b, 0, sizeof(b)); 310 memcpy(&b.data, bid->data, bid->size); 311 b.size = (u8) bid->size; 312 misc |= PERF_RECORD_MISC_BUILD_ID_SIZE; 313 b.pid = pid; 314 b.header.misc = misc; 315 b.header.size = sizeof(b) + len; 316 317 err = do_write(fd, &b, sizeof(b)); 318 if (err < 0) 319 return err; 320 321 return write_padded(fd, name, name_len + 1, len); 322 } 323 324 static int machine__write_buildid_table(struct machine *machine, 325 struct feat_fd *fd) 326 { 327 int err = 0; 328 struct dso *pos; 329 u16 kmisc = PERF_RECORD_MISC_KERNEL, 330 umisc = PERF_RECORD_MISC_USER; 331 332 if (!machine__is_host(machine)) { 333 kmisc = PERF_RECORD_MISC_GUEST_KERNEL; 334 umisc = PERF_RECORD_MISC_GUEST_USER; 335 } 336 337 dsos__for_each_with_build_id(pos, &machine->dsos.head) { 338 const char *name; 339 size_t name_len; 340 bool in_kernel = false; 341 342 if (!pos->hit && !dso__is_vdso(pos)) 343 continue; 344 345 if (dso__is_vdso(pos)) { 346 name = pos->short_name; 347 name_len = pos->short_name_len; 348 } else if (dso__is_kcore(pos)) { 349 name = machine->mmap_name; 350 name_len = strlen(name); 351 } else { 352 name = pos->long_name; 353 name_len = pos->long_name_len; 354 } 355 356 in_kernel = pos->kernel || 357 is_kernel_module(name, 358 PERF_RECORD_MISC_CPUMODE_UNKNOWN); 359 err = write_buildid(name, name_len, &pos->bid, machine->pid, 360 in_kernel ? kmisc : umisc, fd); 361 if (err) 362 break; 363 } 364 365 return err; 366 } 367 368 int perf_session__write_buildid_table(struct perf_session *session, 369 struct feat_fd *fd) 370 { 371 struct rb_node *nd; 372 int err = machine__write_buildid_table(&session->machines.host, fd); 373 374 if (err) 375 return err; 376 377 for (nd = rb_first_cached(&session->machines.guests); nd; 378 nd = rb_next(nd)) { 379 struct machine *pos = rb_entry(nd, struct machine, rb_node); 380 err = machine__write_buildid_table(pos, fd); 381 if (err) 382 break; 383 } 384 return err; 385 } 386 387 static int __dsos__hit_all(struct list_head *head) 388 { 389 struct dso *pos; 390 391 list_for_each_entry(pos, head, node) 392 pos->hit = true; 393 394 return 0; 395 } 396 397 static int machine__hit_all_dsos(struct machine *machine) 398 { 399 return __dsos__hit_all(&machine->dsos.head); 400 } 401 402 int dsos__hit_all(struct perf_session *session) 403 { 404 struct rb_node *nd; 405 int err; 406 407 err = machine__hit_all_dsos(&session->machines.host); 408 if (err) 409 return err; 410 411 for (nd = rb_first_cached(&session->machines.guests); nd; 412 nd = rb_next(nd)) { 413 struct machine *pos = rb_entry(nd, struct machine, rb_node); 414 415 err = machine__hit_all_dsos(pos); 416 if (err) 417 return err; 418 } 419 420 return 0; 421 } 422 423 void disable_buildid_cache(void) 424 { 425 no_buildid_cache = true; 426 } 427 428 static bool lsdir_bid_head_filter(const char *name __maybe_unused, 429 struct dirent *d) 430 { 431 return (strlen(d->d_name) == 2) && 432 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); 433 } 434 435 static bool lsdir_bid_tail_filter(const char *name __maybe_unused, 436 struct dirent *d) 437 { 438 int i = 0; 439 while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) 440 i++; 441 return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); 442 } 443 444 struct strlist *build_id_cache__list_all(bool validonly) 445 { 446 struct strlist *toplist, *linklist = NULL, *bidlist; 447 struct str_node *nd, *nd2; 448 char *topdir, *linkdir = NULL; 449 char sbuild_id[SBUILD_ID_SIZE]; 450 451 /* for filename__ functions */ 452 if (validonly) 453 symbol__init(NULL); 454 455 /* Open the top-level directory */ 456 if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) 457 return NULL; 458 459 bidlist = strlist__new(NULL, NULL); 460 if (!bidlist) 461 goto out; 462 463 toplist = lsdir(topdir, lsdir_bid_head_filter); 464 if (!toplist) { 465 pr_debug("Error in lsdir(%s): %d\n", topdir, errno); 466 /* If there is no buildid cache, return an empty list */ 467 if (errno == ENOENT) 468 goto out; 469 goto err_out; 470 } 471 472 strlist__for_each_entry(nd, toplist) { 473 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) 474 goto err_out; 475 /* Open the lower-level directory */ 476 linklist = lsdir(linkdir, lsdir_bid_tail_filter); 477 if (!linklist) { 478 pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); 479 goto err_out; 480 } 481 strlist__for_each_entry(nd2, linklist) { 482 if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", 483 nd->s, nd2->s) != SBUILD_ID_SIZE - 1) 484 goto err_out; 485 if (validonly && !build_id_cache__valid_id(sbuild_id)) 486 continue; 487 if (strlist__add(bidlist, sbuild_id) < 0) 488 goto err_out; 489 } 490 strlist__delete(linklist); 491 zfree(&linkdir); 492 } 493 494 out_free: 495 strlist__delete(toplist); 496 out: 497 free(topdir); 498 499 return bidlist; 500 501 err_out: 502 strlist__delete(linklist); 503 zfree(&linkdir); 504 strlist__delete(bidlist); 505 bidlist = NULL; 506 goto out_free; 507 } 508 509 static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) 510 { 511 size_t i; 512 513 for (i = 0; i < len; i++) { 514 if (!isxdigit(maybe_sbuild_id[i])) 515 return false; 516 } 517 return true; 518 } 519 520 /* Return the valid complete build-id */ 521 char *build_id_cache__complement(const char *incomplete_sbuild_id) 522 { 523 struct strlist *bidlist; 524 struct str_node *nd, *cand = NULL; 525 char *sbuild_id = NULL; 526 size_t len = strlen(incomplete_sbuild_id); 527 528 if (len >= SBUILD_ID_SIZE || 529 !str_is_build_id(incomplete_sbuild_id, len)) 530 return NULL; 531 532 bidlist = build_id_cache__list_all(true); 533 if (!bidlist) 534 return NULL; 535 536 strlist__for_each_entry(nd, bidlist) { 537 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) 538 continue; 539 if (cand) { /* Error: There are more than 2 candidates. */ 540 cand = NULL; 541 break; 542 } 543 cand = nd; 544 } 545 if (cand) 546 sbuild_id = strdup(cand->s); 547 strlist__delete(bidlist); 548 549 return sbuild_id; 550 } 551 552 char *build_id_cache__cachedir(const char *sbuild_id, const char *name, 553 struct nsinfo *nsi, bool is_kallsyms, 554 bool is_vdso) 555 { 556 char *realname = (char *)name, *filename; 557 bool slash = is_kallsyms || is_vdso; 558 559 if (!slash) { 560 realname = nsinfo__realpath(name, nsi); 561 if (!realname) 562 return NULL; 563 } 564 565 if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", 566 is_vdso ? DSO__NAME_VDSO : realname, 567 sbuild_id ? "/" : "", sbuild_id ?: "") < 0) 568 filename = NULL; 569 570 if (!slash) 571 free(realname); 572 573 return filename; 574 } 575 576 int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, 577 struct strlist **result) 578 { 579 char *dir_name; 580 int ret = 0; 581 582 dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); 583 if (!dir_name) 584 return -ENOMEM; 585 586 *result = lsdir(dir_name, lsdir_no_dot_filter); 587 if (!*result) 588 ret = -errno; 589 free(dir_name); 590 591 return ret; 592 } 593 594 #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) 595 static int build_id_cache__add_sdt_cache(const char *sbuild_id, 596 const char *realname, 597 struct nsinfo *nsi) 598 { 599 struct probe_cache *cache; 600 int ret; 601 struct nscookie nsc; 602 603 cache = probe_cache__new(sbuild_id, nsi); 604 if (!cache) 605 return -1; 606 607 nsinfo__mountns_enter(nsi, &nsc); 608 ret = probe_cache__scan_sdt(cache, realname); 609 nsinfo__mountns_exit(&nsc); 610 if (ret >= 0) { 611 pr_debug4("Found %d SDTs in %s\n", ret, realname); 612 if (probe_cache__commit(cache) < 0) 613 ret = -1; 614 } 615 probe_cache__delete(cache); 616 return ret; 617 } 618 #else 619 #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) 620 #endif 621 622 static char *build_id_cache__find_debug(const char *sbuild_id, 623 struct nsinfo *nsi) 624 { 625 char *realname = NULL; 626 char *debugfile; 627 struct nscookie nsc; 628 size_t len = 0; 629 630 debugfile = calloc(1, PATH_MAX); 631 if (!debugfile) 632 goto out; 633 634 len = __symbol__join_symfs(debugfile, PATH_MAX, 635 "/usr/lib/debug/.build-id/"); 636 snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, 637 sbuild_id + 2); 638 639 nsinfo__mountns_enter(nsi, &nsc); 640 realname = realpath(debugfile, NULL); 641 if (realname && access(realname, R_OK)) 642 zfree(&realname); 643 nsinfo__mountns_exit(&nsc); 644 645 #ifdef HAVE_DEBUGINFOD_SUPPORT 646 if (realname == NULL) { 647 debuginfod_client* c = debuginfod_begin(); 648 if (c != NULL) { 649 int fd = debuginfod_find_debuginfo(c, 650 (const unsigned char*)sbuild_id, 0, 651 &realname); 652 if (fd >= 0) 653 close(fd); /* retaining reference by realname */ 654 debuginfod_end(c); 655 } 656 } 657 #endif 658 659 out: 660 free(debugfile); 661 return realname; 662 } 663 664 int build_id_cache__add_s(const char *sbuild_id, const char *name, 665 struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) 666 { 667 const size_t size = PATH_MAX; 668 char *realname = NULL, *filename = NULL, *dir_name = NULL, 669 *linkname = zalloc(size), *tmp; 670 char *debugfile = NULL; 671 int err = -1; 672 673 if (!is_kallsyms) { 674 if (!is_vdso) 675 realname = nsinfo__realpath(name, nsi); 676 else 677 realname = realpath(name, NULL); 678 if (!realname) 679 goto out_free; 680 } 681 682 dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, 683 is_vdso); 684 if (!dir_name) 685 goto out_free; 686 687 /* Remove old style build-id cache */ 688 if (is_regular_file(dir_name)) 689 if (unlink(dir_name)) 690 goto out_free; 691 692 if (mkdir_p(dir_name, 0755)) 693 goto out_free; 694 695 /* Save the allocated buildid dirname */ 696 if (asprintf(&filename, "%s/%s", dir_name, 697 build_id_cache__basename(is_kallsyms, is_vdso, 698 false)) < 0) { 699 filename = NULL; 700 goto out_free; 701 } 702 703 if (access(filename, F_OK)) { 704 if (is_kallsyms) { 705 if (copyfile("/proc/kallsyms", filename)) 706 goto out_free; 707 } else if (nsi && nsi->need_setns) { 708 if (copyfile_ns(name, filename, nsi)) 709 goto out_free; 710 } else if (link(realname, filename) && errno != EEXIST && 711 copyfile(name, filename)) 712 goto out_free; 713 } 714 715 /* Some binaries are stripped, but have .debug files with their symbol 716 * table. Check to see if we can locate one of those, since the elf 717 * file itself may not be very useful to users of our tools without a 718 * symtab. 719 */ 720 if (!is_kallsyms && !is_vdso && 721 strncmp(".ko", name + strlen(name) - 3, 3)) { 722 debugfile = build_id_cache__find_debug(sbuild_id, nsi); 723 if (debugfile) { 724 zfree(&filename); 725 if (asprintf(&filename, "%s/%s", dir_name, 726 build_id_cache__basename(false, false, true)) < 0) { 727 filename = NULL; 728 goto out_free; 729 } 730 if (access(filename, F_OK)) { 731 if (nsi && nsi->need_setns) { 732 if (copyfile_ns(debugfile, filename, 733 nsi)) 734 goto out_free; 735 } else if (link(debugfile, filename) && 736 errno != EEXIST && 737 copyfile(debugfile, filename)) 738 goto out_free; 739 } 740 } 741 } 742 743 if (!build_id_cache__linkname(sbuild_id, linkname, size)) 744 goto out_free; 745 tmp = strrchr(linkname, '/'); 746 *tmp = '\0'; 747 748 if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) 749 goto out_free; 750 751 *tmp = '/'; 752 tmp = dir_name + strlen(buildid_dir) - 5; 753 memcpy(tmp, "../..", 5); 754 755 if (symlink(tmp, linkname) == 0) 756 err = 0; 757 758 /* Update SDT cache : error is just warned */ 759 if (realname && 760 build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) 761 pr_debug4("Failed to update/scan SDT cache for %s\n", realname); 762 763 out_free: 764 if (!is_kallsyms) 765 free(realname); 766 free(filename); 767 free(debugfile); 768 free(dir_name); 769 free(linkname); 770 return err; 771 } 772 773 static int build_id_cache__add_b(const struct build_id *bid, 774 const char *name, struct nsinfo *nsi, 775 bool is_kallsyms, bool is_vdso) 776 { 777 char sbuild_id[SBUILD_ID_SIZE]; 778 779 build_id__sprintf(bid, sbuild_id); 780 781 return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, 782 is_vdso); 783 } 784 785 bool build_id_cache__cached(const char *sbuild_id) 786 { 787 bool ret = false; 788 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); 789 790 if (filename && !access(filename, F_OK)) 791 ret = true; 792 free(filename); 793 794 return ret; 795 } 796 797 int build_id_cache__remove_s(const char *sbuild_id) 798 { 799 const size_t size = PATH_MAX; 800 char *filename = zalloc(size), 801 *linkname = zalloc(size), *tmp; 802 int err = -1; 803 804 if (filename == NULL || linkname == NULL) 805 goto out_free; 806 807 if (!build_id_cache__linkname(sbuild_id, linkname, size)) 808 goto out_free; 809 810 if (access(linkname, F_OK)) 811 goto out_free; 812 813 if (readlink(linkname, filename, size - 1) < 0) 814 goto out_free; 815 816 if (unlink(linkname)) 817 goto out_free; 818 819 /* 820 * Since the link is relative, we must make it absolute: 821 */ 822 tmp = strrchr(linkname, '/') + 1; 823 snprintf(tmp, size - (tmp - linkname), "%s", filename); 824 825 if (rm_rf(linkname)) 826 goto out_free; 827 828 err = 0; 829 out_free: 830 free(filename); 831 free(linkname); 832 return err; 833 } 834 835 static int dso__cache_build_id(struct dso *dso, struct machine *machine) 836 { 837 bool is_kallsyms = dso__is_kallsyms(dso); 838 bool is_vdso = dso__is_vdso(dso); 839 const char *name = dso->long_name; 840 841 if (dso__is_kcore(dso)) { 842 is_kallsyms = true; 843 name = machine->mmap_name; 844 } 845 return build_id_cache__add_b(&dso->bid, name, dso->nsinfo, 846 is_kallsyms, is_vdso); 847 } 848 849 static int __dsos__cache_build_ids(struct list_head *head, 850 struct machine *machine) 851 { 852 struct dso *pos; 853 int err = 0; 854 855 dsos__for_each_with_build_id(pos, head) 856 if (dso__cache_build_id(pos, machine)) 857 err = -1; 858 859 return err; 860 } 861 862 static int machine__cache_build_ids(struct machine *machine) 863 { 864 return __dsos__cache_build_ids(&machine->dsos.head, machine); 865 } 866 867 int perf_session__cache_build_ids(struct perf_session *session) 868 { 869 struct rb_node *nd; 870 int ret; 871 872 if (no_buildid_cache) 873 return 0; 874 875 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) 876 return -1; 877 878 ret = machine__cache_build_ids(&session->machines.host); 879 880 for (nd = rb_first_cached(&session->machines.guests); nd; 881 nd = rb_next(nd)) { 882 struct machine *pos = rb_entry(nd, struct machine, rb_node); 883 ret |= machine__cache_build_ids(pos); 884 } 885 return ret ? -1 : 0; 886 } 887 888 static bool machine__read_build_ids(struct machine *machine, bool with_hits) 889 { 890 return __dsos__read_build_ids(&machine->dsos.head, with_hits); 891 } 892 893 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) 894 { 895 struct rb_node *nd; 896 bool ret = machine__read_build_ids(&session->machines.host, with_hits); 897 898 for (nd = rb_first_cached(&session->machines.guests); nd; 899 nd = rb_next(nd)) { 900 struct machine *pos = rb_entry(nd, struct machine, rb_node); 901 ret |= machine__read_build_ids(pos, with_hits); 902 } 903 904 return ret; 905 } 906 907 void build_id__init(struct build_id *bid, const u8 *data, size_t size) 908 { 909 WARN_ON(size > BUILD_ID_SIZE); 910 memcpy(bid->data, data, size); 911 bid->size = size; 912 } 913