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