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 bf[0] = 0x0; 106 107 for (i = 0; i < build_id->size; ++i) { 108 sprintf(bid, "%02x", *raw); 109 ++raw; 110 bid += 2; 111 } 112 113 return (bid - bf) + 1; 114 } 115 116 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) 117 { 118 char notes[PATH_MAX]; 119 struct build_id bid; 120 int ret; 121 122 if (!root_dir) 123 root_dir = ""; 124 125 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); 126 127 ret = sysfs__read_build_id(notes, &bid); 128 if (ret < 0) 129 return ret; 130 131 return build_id__sprintf(&bid, sbuild_id); 132 } 133 134 int filename__sprintf_build_id(const char *pathname, char *sbuild_id) 135 { 136 struct build_id bid; 137 int ret; 138 139 ret = filename__read_build_id(pathname, &bid); 140 if (ret < 0) 141 return ret; 142 143 return build_id__sprintf(&bid, sbuild_id); 144 } 145 146 /* asnprintf consolidates asprintf and snprintf */ 147 static int asnprintf(char **strp, size_t size, const char *fmt, ...) 148 { 149 va_list ap; 150 int ret; 151 152 if (!strp) 153 return -EINVAL; 154 155 va_start(ap, fmt); 156 if (*strp) 157 ret = vsnprintf(*strp, size, fmt, ap); 158 else 159 ret = vasprintf(strp, fmt, ap); 160 va_end(ap); 161 162 return ret; 163 } 164 165 char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, 166 size_t size) 167 { 168 bool retry_old = true; 169 170 snprintf(bf, size, "%s/%s/%s/kallsyms", 171 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); 172 retry: 173 if (!access(bf, F_OK)) 174 return bf; 175 if (retry_old) { 176 /* Try old style kallsyms cache */ 177 snprintf(bf, size, "%s/%s/%s", 178 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); 179 retry_old = false; 180 goto retry; 181 } 182 183 return NULL; 184 } 185 186 char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) 187 { 188 char *tmp = bf; 189 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, 190 sbuild_id, sbuild_id + 2); 191 if (ret < 0 || (tmp && size < (unsigned int)ret)) 192 return NULL; 193 return bf; 194 } 195 196 /* The caller is responsible to free the returned buffer. */ 197 char *build_id_cache__origname(const char *sbuild_id) 198 { 199 char *linkname; 200 char buf[PATH_MAX]; 201 char *ret = NULL, *p; 202 size_t offs = 5; /* == strlen("../..") */ 203 ssize_t len; 204 205 linkname = build_id_cache__linkname(sbuild_id, NULL, 0); 206 if (!linkname) 207 return NULL; 208 209 len = readlink(linkname, buf, sizeof(buf) - 1); 210 if (len <= 0) 211 goto out; 212 buf[len] = '\0'; 213 214 /* The link should be "../..<origpath>/<sbuild_id>" */ 215 p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ 216 if (p && (p > buf + offs)) { 217 *p = '\0'; 218 if (buf[offs + 1] == '[') 219 offs++; /* 220 * This is a DSO name, like [kernel.kallsyms]. 221 * Skip the first '/', since this is not the 222 * cache of a regular file. 223 */ 224 ret = strdup(buf + offs); /* Skip "../..[/]" */ 225 } 226 out: 227 free(linkname); 228 return ret; 229 } 230 231 /* Check if the given build_id cache is valid on current running system */ 232 static bool build_id_cache__valid_id(char *sbuild_id) 233 { 234 char real_sbuild_id[SBUILD_ID_SIZE] = ""; 235 char *pathname; 236 int ret = 0; 237 bool result = false; 238 239 pathname = build_id_cache__origname(sbuild_id); 240 if (!pathname) 241 return false; 242 243 if (!strcmp(pathname, DSO__NAME_KALLSYMS)) 244 ret = sysfs__sprintf_build_id("/", real_sbuild_id); 245 else if (pathname[0] == '/') 246 ret = filename__sprintf_build_id(pathname, real_sbuild_id); 247 else 248 ret = -EINVAL; /* Should we support other special DSO cache? */ 249 if (ret >= 0) 250 result = (strcmp(sbuild_id, real_sbuild_id) == 0); 251 free(pathname); 252 253 return result; 254 } 255 256 static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, 257 bool is_debug) 258 { 259 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? 260 "debug" : "elf")); 261 } 262 263 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, 264 bool is_debug) 265 { 266 bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); 267 bool is_vdso = dso__is_vdso((struct dso *)dso); 268 char sbuild_id[SBUILD_ID_SIZE]; 269 char *linkname; 270 bool alloc = (bf == NULL); 271 int ret; 272 273 if (!dso->has_build_id) 274 return NULL; 275 276 build_id__sprintf(&dso->bid, sbuild_id); 277 linkname = build_id_cache__linkname(sbuild_id, NULL, 0); 278 if (!linkname) 279 return NULL; 280 281 /* Check if old style build_id cache */ 282 if (is_regular_file(linkname)) 283 ret = asnprintf(&bf, size, "%s", linkname); 284 else 285 ret = asnprintf(&bf, size, "%s/%s", linkname, 286 build_id_cache__basename(is_kallsyms, is_vdso, 287 is_debug)); 288 if (ret < 0 || (!alloc && size < (unsigned int)ret)) 289 bf = NULL; 290 free(linkname); 291 292 return bf; 293 } 294 295 #define dsos__for_each_with_build_id(pos, head) \ 296 list_for_each_entry(pos, head, node) \ 297 if (!pos->has_build_id) \ 298 continue; \ 299 else 300 301 static int write_buildid(const char *name, size_t name_len, struct build_id *bid, 302 pid_t pid, u16 misc, struct feat_fd *fd) 303 { 304 int err; 305 struct perf_record_header_build_id b; 306 size_t len; 307 308 len = name_len + 1; 309 len = PERF_ALIGN(len, NAME_ALIGN); 310 311 memset(&b, 0, sizeof(b)); 312 memcpy(&b.data, bid->data, bid->size); 313 b.size = (u8) bid->size; 314 misc |= PERF_RECORD_MISC_BUILD_ID_SIZE; 315 b.pid = pid; 316 b.header.misc = misc; 317 b.header.size = sizeof(b) + len; 318 319 err = do_write(fd, &b, sizeof(b)); 320 if (err < 0) 321 return err; 322 323 return write_padded(fd, name, name_len + 1, len); 324 } 325 326 static int machine__write_buildid_table(struct machine *machine, 327 struct feat_fd *fd) 328 { 329 int err = 0; 330 struct dso *pos; 331 u16 kmisc = PERF_RECORD_MISC_KERNEL, 332 umisc = PERF_RECORD_MISC_USER; 333 334 if (!machine__is_host(machine)) { 335 kmisc = PERF_RECORD_MISC_GUEST_KERNEL; 336 umisc = PERF_RECORD_MISC_GUEST_USER; 337 } 338 339 dsos__for_each_with_build_id(pos, &machine->dsos.head) { 340 const char *name; 341 size_t name_len; 342 bool in_kernel = false; 343 344 if (!pos->hit && !dso__is_vdso(pos)) 345 continue; 346 347 if (dso__is_vdso(pos)) { 348 name = pos->short_name; 349 name_len = pos->short_name_len; 350 } else if (dso__is_kcore(pos)) { 351 name = machine->mmap_name; 352 name_len = strlen(name); 353 } else { 354 name = pos->long_name; 355 name_len = pos->long_name_len; 356 } 357 358 in_kernel = pos->kernel || 359 is_kernel_module(name, 360 PERF_RECORD_MISC_CPUMODE_UNKNOWN); 361 err = write_buildid(name, name_len, &pos->bid, machine->pid, 362 in_kernel ? kmisc : umisc, fd); 363 if (err) 364 break; 365 } 366 367 return err; 368 } 369 370 int perf_session__write_buildid_table(struct perf_session *session, 371 struct feat_fd *fd) 372 { 373 struct rb_node *nd; 374 int err = machine__write_buildid_table(&session->machines.host, fd); 375 376 if (err) 377 return err; 378 379 for (nd = rb_first_cached(&session->machines.guests); nd; 380 nd = rb_next(nd)) { 381 struct machine *pos = rb_entry(nd, struct machine, rb_node); 382 err = machine__write_buildid_table(pos, fd); 383 if (err) 384 break; 385 } 386 return err; 387 } 388 389 static int __dsos__hit_all(struct list_head *head) 390 { 391 struct dso *pos; 392 393 list_for_each_entry(pos, head, node) 394 pos->hit = true; 395 396 return 0; 397 } 398 399 static int machine__hit_all_dsos(struct machine *machine) 400 { 401 return __dsos__hit_all(&machine->dsos.head); 402 } 403 404 int dsos__hit_all(struct perf_session *session) 405 { 406 struct rb_node *nd; 407 int err; 408 409 err = machine__hit_all_dsos(&session->machines.host); 410 if (err) 411 return err; 412 413 for (nd = rb_first_cached(&session->machines.guests); nd; 414 nd = rb_next(nd)) { 415 struct machine *pos = rb_entry(nd, struct machine, rb_node); 416 417 err = machine__hit_all_dsos(pos); 418 if (err) 419 return err; 420 } 421 422 return 0; 423 } 424 425 void disable_buildid_cache(void) 426 { 427 no_buildid_cache = true; 428 } 429 430 static bool lsdir_bid_head_filter(const char *name __maybe_unused, 431 struct dirent *d) 432 { 433 return (strlen(d->d_name) == 2) && 434 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); 435 } 436 437 static bool lsdir_bid_tail_filter(const char *name __maybe_unused, 438 struct dirent *d) 439 { 440 int i = 0; 441 while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) 442 i++; 443 return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); 444 } 445 446 struct strlist *build_id_cache__list_all(bool validonly) 447 { 448 struct strlist *toplist, *linklist = NULL, *bidlist; 449 struct str_node *nd, *nd2; 450 char *topdir, *linkdir = NULL; 451 char sbuild_id[SBUILD_ID_SIZE]; 452 453 /* for filename__ functions */ 454 if (validonly) 455 symbol__init(NULL); 456 457 /* Open the top-level directory */ 458 if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) 459 return NULL; 460 461 bidlist = strlist__new(NULL, NULL); 462 if (!bidlist) 463 goto out; 464 465 toplist = lsdir(topdir, lsdir_bid_head_filter); 466 if (!toplist) { 467 pr_debug("Error in lsdir(%s): %d\n", topdir, errno); 468 /* If there is no buildid cache, return an empty list */ 469 if (errno == ENOENT) 470 goto out; 471 goto err_out; 472 } 473 474 strlist__for_each_entry(nd, toplist) { 475 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) 476 goto err_out; 477 /* Open the lower-level directory */ 478 linklist = lsdir(linkdir, lsdir_bid_tail_filter); 479 if (!linklist) { 480 pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); 481 goto err_out; 482 } 483 strlist__for_each_entry(nd2, linklist) { 484 if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", 485 nd->s, nd2->s) != SBUILD_ID_SIZE - 1) 486 goto err_out; 487 if (validonly && !build_id_cache__valid_id(sbuild_id)) 488 continue; 489 if (strlist__add(bidlist, sbuild_id) < 0) 490 goto err_out; 491 } 492 strlist__delete(linklist); 493 zfree(&linkdir); 494 } 495 496 out_free: 497 strlist__delete(toplist); 498 out: 499 free(topdir); 500 501 return bidlist; 502 503 err_out: 504 strlist__delete(linklist); 505 zfree(&linkdir); 506 strlist__delete(bidlist); 507 bidlist = NULL; 508 goto out_free; 509 } 510 511 static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) 512 { 513 size_t i; 514 515 for (i = 0; i < len; i++) { 516 if (!isxdigit(maybe_sbuild_id[i])) 517 return false; 518 } 519 return true; 520 } 521 522 /* Return the valid complete build-id */ 523 char *build_id_cache__complement(const char *incomplete_sbuild_id) 524 { 525 struct strlist *bidlist; 526 struct str_node *nd, *cand = NULL; 527 char *sbuild_id = NULL; 528 size_t len = strlen(incomplete_sbuild_id); 529 530 if (len >= SBUILD_ID_SIZE || 531 !str_is_build_id(incomplete_sbuild_id, len)) 532 return NULL; 533 534 bidlist = build_id_cache__list_all(true); 535 if (!bidlist) 536 return NULL; 537 538 strlist__for_each_entry(nd, bidlist) { 539 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) 540 continue; 541 if (cand) { /* Error: There are more than 2 candidates. */ 542 cand = NULL; 543 break; 544 } 545 cand = nd; 546 } 547 if (cand) 548 sbuild_id = strdup(cand->s); 549 strlist__delete(bidlist); 550 551 return sbuild_id; 552 } 553 554 char *build_id_cache__cachedir(const char *sbuild_id, const char *name, 555 struct nsinfo *nsi, bool is_kallsyms, 556 bool is_vdso) 557 { 558 char *realname = (char *)name, *filename; 559 bool slash = is_kallsyms || is_vdso; 560 561 if (!slash) { 562 realname = nsinfo__realpath(name, nsi); 563 if (!realname) 564 return NULL; 565 } 566 567 if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", 568 is_vdso ? DSO__NAME_VDSO : realname, 569 sbuild_id ? "/" : "", sbuild_id ?: "") < 0) 570 filename = NULL; 571 572 if (!slash) 573 free(realname); 574 575 return filename; 576 } 577 578 int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, 579 struct strlist **result) 580 { 581 char *dir_name; 582 int ret = 0; 583 584 dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); 585 if (!dir_name) 586 return -ENOMEM; 587 588 *result = lsdir(dir_name, lsdir_no_dot_filter); 589 if (!*result) 590 ret = -errno; 591 free(dir_name); 592 593 return ret; 594 } 595 596 #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) 597 static int build_id_cache__add_sdt_cache(const char *sbuild_id, 598 const char *realname, 599 struct nsinfo *nsi) 600 { 601 struct probe_cache *cache; 602 int ret; 603 struct nscookie nsc; 604 605 cache = probe_cache__new(sbuild_id, nsi); 606 if (!cache) 607 return -1; 608 609 nsinfo__mountns_enter(nsi, &nsc); 610 ret = probe_cache__scan_sdt(cache, realname); 611 nsinfo__mountns_exit(&nsc); 612 if (ret >= 0) { 613 pr_debug4("Found %d SDTs in %s\n", ret, realname); 614 if (probe_cache__commit(cache) < 0) 615 ret = -1; 616 } 617 probe_cache__delete(cache); 618 return ret; 619 } 620 #else 621 #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) 622 #endif 623 624 static char *build_id_cache__find_debug(const char *sbuild_id, 625 struct nsinfo *nsi) 626 { 627 char *realname = NULL; 628 char *debugfile; 629 struct nscookie nsc; 630 size_t len = 0; 631 632 debugfile = calloc(1, PATH_MAX); 633 if (!debugfile) 634 goto out; 635 636 len = __symbol__join_symfs(debugfile, PATH_MAX, 637 "/usr/lib/debug/.build-id/"); 638 snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, 639 sbuild_id + 2); 640 641 nsinfo__mountns_enter(nsi, &nsc); 642 realname = realpath(debugfile, NULL); 643 if (realname && access(realname, R_OK)) 644 zfree(&realname); 645 nsinfo__mountns_exit(&nsc); 646 647 #ifdef HAVE_DEBUGINFOD_SUPPORT 648 if (realname == NULL) { 649 debuginfod_client* c = debuginfod_begin(); 650 if (c != NULL) { 651 int fd = debuginfod_find_debuginfo(c, 652 (const unsigned char*)sbuild_id, 0, 653 &realname); 654 if (fd >= 0) 655 close(fd); /* retaining reference by realname */ 656 debuginfod_end(c); 657 } 658 } 659 #endif 660 661 out: 662 free(debugfile); 663 return realname; 664 } 665 666 int build_id_cache__add_s(const char *sbuild_id, const char *name, 667 struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) 668 { 669 const size_t size = PATH_MAX; 670 char *realname = NULL, *filename = NULL, *dir_name = NULL, 671 *linkname = zalloc(size), *tmp; 672 char *debugfile = NULL; 673 int err = -1; 674 675 if (!is_kallsyms) { 676 if (!is_vdso) 677 realname = nsinfo__realpath(name, nsi); 678 else 679 realname = realpath(name, NULL); 680 if (!realname) 681 goto out_free; 682 } 683 684 dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, 685 is_vdso); 686 if (!dir_name) 687 goto out_free; 688 689 /* Remove old style build-id cache */ 690 if (is_regular_file(dir_name)) 691 if (unlink(dir_name)) 692 goto out_free; 693 694 if (mkdir_p(dir_name, 0755)) 695 goto out_free; 696 697 /* Save the allocated buildid dirname */ 698 if (asprintf(&filename, "%s/%s", dir_name, 699 build_id_cache__basename(is_kallsyms, is_vdso, 700 false)) < 0) { 701 filename = NULL; 702 goto out_free; 703 } 704 705 if (access(filename, F_OK)) { 706 if (is_kallsyms) { 707 if (copyfile("/proc/kallsyms", filename)) 708 goto out_free; 709 } else if (nsi && nsi->need_setns) { 710 if (copyfile_ns(name, filename, nsi)) 711 goto out_free; 712 } else if (link(realname, filename) && errno != EEXIST && 713 copyfile(name, filename)) 714 goto out_free; 715 } 716 717 /* Some binaries are stripped, but have .debug files with their symbol 718 * table. Check to see if we can locate one of those, since the elf 719 * file itself may not be very useful to users of our tools without a 720 * symtab. 721 */ 722 if (!is_kallsyms && !is_vdso && 723 strncmp(".ko", name + strlen(name) - 3, 3)) { 724 debugfile = build_id_cache__find_debug(sbuild_id, nsi); 725 if (debugfile) { 726 zfree(&filename); 727 if (asprintf(&filename, "%s/%s", dir_name, 728 build_id_cache__basename(false, false, true)) < 0) { 729 filename = NULL; 730 goto out_free; 731 } 732 if (access(filename, F_OK)) { 733 if (nsi && nsi->need_setns) { 734 if (copyfile_ns(debugfile, filename, 735 nsi)) 736 goto out_free; 737 } else if (link(debugfile, filename) && 738 errno != EEXIST && 739 copyfile(debugfile, filename)) 740 goto out_free; 741 } 742 } 743 } 744 745 if (!build_id_cache__linkname(sbuild_id, linkname, size)) 746 goto out_free; 747 tmp = strrchr(linkname, '/'); 748 *tmp = '\0'; 749 750 if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) 751 goto out_free; 752 753 *tmp = '/'; 754 tmp = dir_name + strlen(buildid_dir) - 5; 755 memcpy(tmp, "../..", 5); 756 757 if (symlink(tmp, linkname) == 0) 758 err = 0; 759 760 /* Update SDT cache : error is just warned */ 761 if (realname && 762 build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) 763 pr_debug4("Failed to update/scan SDT cache for %s\n", realname); 764 765 out_free: 766 if (!is_kallsyms) 767 free(realname); 768 free(filename); 769 free(debugfile); 770 free(dir_name); 771 free(linkname); 772 return err; 773 } 774 775 static int build_id_cache__add_b(const struct build_id *bid, 776 const char *name, struct nsinfo *nsi, 777 bool is_kallsyms, bool is_vdso) 778 { 779 char sbuild_id[SBUILD_ID_SIZE]; 780 781 build_id__sprintf(bid, sbuild_id); 782 783 return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, 784 is_vdso); 785 } 786 787 bool build_id_cache__cached(const char *sbuild_id) 788 { 789 bool ret = false; 790 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); 791 792 if (filename && !access(filename, F_OK)) 793 ret = true; 794 free(filename); 795 796 return ret; 797 } 798 799 int build_id_cache__remove_s(const char *sbuild_id) 800 { 801 const size_t size = PATH_MAX; 802 char *filename = zalloc(size), 803 *linkname = zalloc(size), *tmp; 804 int err = -1; 805 806 if (filename == NULL || linkname == NULL) 807 goto out_free; 808 809 if (!build_id_cache__linkname(sbuild_id, linkname, size)) 810 goto out_free; 811 812 if (access(linkname, F_OK)) 813 goto out_free; 814 815 if (readlink(linkname, filename, size - 1) < 0) 816 goto out_free; 817 818 if (unlink(linkname)) 819 goto out_free; 820 821 /* 822 * Since the link is relative, we must make it absolute: 823 */ 824 tmp = strrchr(linkname, '/') + 1; 825 snprintf(tmp, size - (tmp - linkname), "%s", filename); 826 827 if (rm_rf(linkname)) 828 goto out_free; 829 830 err = 0; 831 out_free: 832 free(filename); 833 free(linkname); 834 return err; 835 } 836 837 static int dso__cache_build_id(struct dso *dso, struct machine *machine) 838 { 839 bool is_kallsyms = dso__is_kallsyms(dso); 840 bool is_vdso = dso__is_vdso(dso); 841 const char *name = dso->long_name; 842 843 if (dso__is_kcore(dso)) { 844 is_kallsyms = true; 845 name = machine->mmap_name; 846 } 847 return build_id_cache__add_b(&dso->bid, name, dso->nsinfo, 848 is_kallsyms, is_vdso); 849 } 850 851 static int __dsos__cache_build_ids(struct list_head *head, 852 struct machine *machine) 853 { 854 struct dso *pos; 855 int err = 0; 856 857 dsos__for_each_with_build_id(pos, head) 858 if (dso__cache_build_id(pos, machine)) 859 err = -1; 860 861 return err; 862 } 863 864 static int machine__cache_build_ids(struct machine *machine) 865 { 866 return __dsos__cache_build_ids(&machine->dsos.head, machine); 867 } 868 869 int perf_session__cache_build_ids(struct perf_session *session) 870 { 871 struct rb_node *nd; 872 int ret; 873 874 if (no_buildid_cache) 875 return 0; 876 877 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) 878 return -1; 879 880 ret = machine__cache_build_ids(&session->machines.host); 881 882 for (nd = rb_first_cached(&session->machines.guests); nd; 883 nd = rb_next(nd)) { 884 struct machine *pos = rb_entry(nd, struct machine, rb_node); 885 ret |= machine__cache_build_ids(pos); 886 } 887 return ret ? -1 : 0; 888 } 889 890 static bool machine__read_build_ids(struct machine *machine, bool with_hits) 891 { 892 return __dsos__read_build_ids(&machine->dsos.head, with_hits); 893 } 894 895 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) 896 { 897 struct rb_node *nd; 898 bool ret = machine__read_build_ids(&session->machines.host, with_hits); 899 900 for (nd = rb_first_cached(&session->machines.guests); nd; 901 nd = rb_next(nd)) { 902 struct machine *pos = rb_entry(nd, struct machine, rb_node); 903 ret |= machine__read_build_ids(pos, with_hits); 904 } 905 906 return ret; 907 } 908 909 void build_id__init(struct build_id *bid, const u8 *data, size_t size) 910 { 911 WARN_ON(size > BUILD_ID_SIZE); 912 memcpy(bid->data, data, size); 913 bid->size = size; 914 } 915