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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7b2567c1 ACM |
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 | */ | |
b36f19d5 | 10 | #include "util.h" |
76b31a29 | 11 | #include <dirent.h> |
a43783ae | 12 | #include <errno.h> |
b36f19d5 | 13 | #include <stdio.h> |
7a8ef4c4 ACM |
14 | #include <sys/stat.h> |
15 | #include <sys/types.h> | |
7b2567c1 ACM |
16 | #include "build-id.h" |
17 | #include "event.h" | |
18 | #include "symbol.h" | |
e7ff8920 | 19 | #include "thread.h" |
7b2567c1 | 20 | #include <linux/kernel.h> |
591765fd | 21 | #include "debug.h" |
d20deb64 | 22 | #include "session.h" |
45694aa7 | 23 | #include "tool.h" |
e195fac8 NK |
24 | #include "header.h" |
25 | #include "vdso.h" | |
9a3993d4 | 26 | #include "path.h" |
6430a94e | 27 | #include "probe-file.h" |
8ec20b17 | 28 | #include "strlist.h" |
7b2567c1 | 29 | |
3d689ed6 | 30 | #include "sane_ctype.h" |
73c5d224 NK |
31 | |
32 | static bool no_buildid_cache; | |
33 | ||
54a3cf59 AV |
34 | int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
35 | union perf_event *event, | |
ef89325f | 36 | struct perf_sample *sample, |
54a3cf59 AV |
37 | struct perf_evsel *evsel __maybe_unused, |
38 | struct machine *machine) | |
7b2567c1 ACM |
39 | { |
40 | struct addr_location al; | |
ef89325f | 41 | struct thread *thread = machine__findnew_thread(machine, sample->pid, |
13ce34df | 42 | sample->tid); |
7b2567c1 ACM |
43 | |
44 | if (thread == NULL) { | |
45 | pr_err("problem processing %d event, skipping it.\n", | |
46 | event->header.type); | |
47 | return -1; | |
48 | } | |
49 | ||
473398a2 | 50 | thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al); |
7b2567c1 ACM |
51 | |
52 | if (al.map != NULL) | |
53 | al.map->dso->hit = 1; | |
54 | ||
b91fc39f | 55 | thread__put(thread); |
7b2567c1 ACM |
56 | return 0; |
57 | } | |
58 | ||
1d037ca1 | 59 | static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, |
d20deb64 | 60 | union perf_event *event, |
1d037ca1 IT |
61 | struct perf_sample *sample |
62 | __maybe_unused, | |
743eb868 | 63 | struct machine *machine) |
591765fd | 64 | { |
314add6b AH |
65 | struct thread *thread = machine__findnew_thread(machine, |
66 | event->fork.pid, | |
67 | event->fork.tid); | |
591765fd | 68 | |
8115d60c ACM |
69 | dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, |
70 | event->fork.ppid, event->fork.ptid); | |
591765fd | 71 | |
b91fc39f | 72 | if (thread) { |
5e78c69b | 73 | machine__remove_thread(machine, thread); |
b91fc39f ACM |
74 | thread__put(thread); |
75 | } | |
591765fd ACM |
76 | |
77 | return 0; | |
78 | } | |
79 | ||
45694aa7 | 80 | struct perf_tool build_id__mark_dso_hit_ops = { |
7b2567c1 | 81 | .sample = build_id__mark_dso_hit, |
8115d60c | 82 | .mmap = perf_event__process_mmap, |
5c5e854b | 83 | .mmap2 = perf_event__process_mmap2, |
f62d3f0f | 84 | .fork = perf_event__process_fork, |
8115d60c | 85 | .exit = perf_event__exit_del_thread, |
299c3452 SE |
86 | .attr = perf_event__process_attr, |
87 | .build_id = perf_event__process_build_id, | |
1216b65c | 88 | .ordered_events = true, |
7b2567c1 | 89 | }; |
b36f19d5 | 90 | |
ebb296c2 JO |
91 | int build_id__sprintf(const u8 *build_id, int len, char *bf) |
92 | { | |
93 | char *bid = bf; | |
94 | const u8 *raw = build_id; | |
95 | int i; | |
96 | ||
97 | for (i = 0; i < len; ++i) { | |
98 | sprintf(bid, "%02x", *raw); | |
99 | ++raw; | |
100 | bid += 2; | |
101 | } | |
102 | ||
7375e151 | 103 | return (bid - bf) + 1; |
ebb296c2 JO |
104 | } |
105 | ||
0b5a7935 MH |
106 | int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) |
107 | { | |
108 | char notes[PATH_MAX]; | |
109 | u8 build_id[BUILD_ID_SIZE]; | |
110 | int ret; | |
111 | ||
112 | if (!root_dir) | |
113 | root_dir = ""; | |
114 | ||
115 | scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); | |
116 | ||
117 | ret = sysfs__read_build_id(notes, build_id, sizeof(build_id)); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ||
121 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
122 | } | |
123 | ||
124 | int filename__sprintf_build_id(const char *pathname, char *sbuild_id) | |
125 | { | |
126 | u8 build_id[BUILD_ID_SIZE]; | |
127 | int ret; | |
128 | ||
129 | ret = filename__read_build_id(pathname, build_id, sizeof(build_id)); | |
130 | if (ret < 0) | |
131 | return ret; | |
132 | else if (ret != sizeof(build_id)) | |
133 | return -EINVAL; | |
134 | ||
135 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
136 | } | |
137 | ||
5cb113fd MH |
138 | /* asnprintf consolidates asprintf and snprintf */ |
139 | static int asnprintf(char **strp, size_t size, const char *fmt, ...) | |
140 | { | |
141 | va_list ap; | |
142 | int ret; | |
143 | ||
144 | if (!strp) | |
145 | return -EINVAL; | |
146 | ||
147 | va_start(ap, fmt); | |
148 | if (*strp) | |
149 | ret = vsnprintf(*strp, size, fmt, ap); | |
150 | else | |
151 | ret = vasprintf(strp, fmt, ap); | |
152 | va_end(ap); | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
01412261 MH |
157 | char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, |
158 | size_t size) | |
159 | { | |
01412261 MH |
160 | bool retry_old = true; |
161 | ||
c58c49ac WN |
162 | snprintf(bf, size, "%s/%s/%s/kallsyms", |
163 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
164 | retry: |
165 | if (!access(bf, F_OK)) | |
166 | return bf; | |
01412261 MH |
167 | if (retry_old) { |
168 | /* Try old style kallsyms cache */ | |
c58c49ac WN |
169 | snprintf(bf, size, "%s/%s/%s", |
170 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
171 | retry_old = false; |
172 | goto retry; | |
173 | } | |
174 | ||
175 | return NULL; | |
176 | } | |
177 | ||
1f3736c9 | 178 | char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) |
5cb113fd MH |
179 | { |
180 | char *tmp = bf; | |
181 | int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, | |
182 | sbuild_id, sbuild_id + 2); | |
183 | if (ret < 0 || (tmp && size < (unsigned int)ret)) | |
184 | return NULL; | |
185 | return bf; | |
186 | } | |
187 | ||
1f3736c9 MH |
188 | char *build_id_cache__origname(const char *sbuild_id) |
189 | { | |
190 | char *linkname; | |
191 | char buf[PATH_MAX]; | |
192 | char *ret = NULL, *p; | |
193 | size_t offs = 5; /* == strlen("../..") */ | |
5a234211 | 194 | ssize_t len; |
1f3736c9 MH |
195 | |
196 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
197 | if (!linkname) | |
198 | return NULL; | |
199 | ||
5a234211 TR |
200 | len = readlink(linkname, buf, sizeof(buf) - 1); |
201 | if (len <= 0) | |
1f3736c9 | 202 | goto out; |
5a234211 TR |
203 | buf[len] = '\0'; |
204 | ||
1f3736c9 MH |
205 | /* The link should be "../..<origpath>/<sbuild_id>" */ |
206 | p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ | |
207 | if (p && (p > buf + offs)) { | |
208 | *p = '\0'; | |
209 | if (buf[offs + 1] == '[') | |
210 | offs++; /* | |
211 | * This is a DSO name, like [kernel.kallsyms]. | |
212 | * Skip the first '/', since this is not the | |
213 | * cache of a regular file. | |
214 | */ | |
215 | ret = strdup(buf + offs); /* Skip "../..[/]" */ | |
216 | } | |
217 | out: | |
218 | free(linkname); | |
219 | return ret; | |
220 | } | |
221 | ||
c3492a3a MH |
222 | /* Check if the given build_id cache is valid on current running system */ |
223 | static bool build_id_cache__valid_id(char *sbuild_id) | |
224 | { | |
225 | char real_sbuild_id[SBUILD_ID_SIZE] = ""; | |
226 | char *pathname; | |
227 | int ret = 0; | |
228 | bool result = false; | |
229 | ||
230 | pathname = build_id_cache__origname(sbuild_id); | |
231 | if (!pathname) | |
232 | return false; | |
233 | ||
234 | if (!strcmp(pathname, DSO__NAME_KALLSYMS)) | |
235 | ret = sysfs__sprintf_build_id("/", real_sbuild_id); | |
236 | else if (pathname[0] == '/') | |
237 | ret = filename__sprintf_build_id(pathname, real_sbuild_id); | |
238 | else | |
239 | ret = -EINVAL; /* Should we support other special DSO cache? */ | |
240 | if (ret >= 0) | |
241 | result = (strcmp(sbuild_id, real_sbuild_id) == 0); | |
242 | free(pathname); | |
243 | ||
244 | return result; | |
245 | } | |
246 | ||
d2396999 KJ |
247 | static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, |
248 | bool is_debug) | |
01412261 | 249 | { |
d2396999 KJ |
250 | return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? |
251 | "debug" : "elf")); | |
01412261 MH |
252 | } |
253 | ||
d2396999 KJ |
254 | char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
255 | bool is_debug) | |
b36f19d5 | 256 | { |
01412261 MH |
257 | bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); |
258 | bool is_vdso = dso__is_vdso((struct dso *)dso); | |
259 | char sbuild_id[SBUILD_ID_SIZE]; | |
260 | char *linkname; | |
261 | bool alloc = (bf == NULL); | |
262 | int ret; | |
b36f19d5 | 263 | |
c824c433 | 264 | if (!dso->has_build_id) |
b36f19d5 ACM |
265 | return NULL; |
266 | ||
01412261 MH |
267 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
268 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
269 | if (!linkname) | |
270 | return NULL; | |
271 | ||
272 | /* Check if old style build_id cache */ | |
273 | if (is_regular_file(linkname)) | |
274 | ret = asnprintf(&bf, size, "%s", linkname); | |
275 | else | |
276 | ret = asnprintf(&bf, size, "%s/%s", linkname, | |
d2396999 KJ |
277 | build_id_cache__basename(is_kallsyms, is_vdso, |
278 | is_debug)); | |
01412261 MH |
279 | if (ret < 0 || (!alloc && size < (unsigned int)ret)) |
280 | bf = NULL; | |
281 | free(linkname); | |
282 | ||
283 | return bf; | |
b36f19d5 | 284 | } |
e195fac8 NK |
285 | |
286 | #define dsos__for_each_with_build_id(pos, head) \ | |
287 | list_for_each_entry(pos, head, node) \ | |
288 | if (!pos->has_build_id) \ | |
289 | continue; \ | |
290 | else | |
291 | ||
292 | static int write_buildid(const char *name, size_t name_len, u8 *build_id, | |
ccebbeb6 | 293 | pid_t pid, u16 misc, struct feat_fd *fd) |
e195fac8 NK |
294 | { |
295 | int err; | |
296 | struct build_id_event b; | |
297 | size_t len; | |
298 | ||
299 | len = name_len + 1; | |
300 | len = PERF_ALIGN(len, NAME_ALIGN); | |
301 | ||
302 | memset(&b, 0, sizeof(b)); | |
303 | memcpy(&b.build_id, build_id, BUILD_ID_SIZE); | |
304 | b.pid = pid; | |
305 | b.header.misc = misc; | |
306 | b.header.size = sizeof(b) + len; | |
307 | ||
3b8f51a6 | 308 | err = do_write(fd, &b, sizeof(b)); |
e195fac8 NK |
309 | if (err < 0) |
310 | return err; | |
311 | ||
312 | return write_padded(fd, name, name_len + 1, len); | |
313 | } | |
314 | ||
ccebbeb6 DCC |
315 | static int machine__write_buildid_table(struct machine *machine, |
316 | struct feat_fd *fd) | |
e195fac8 | 317 | { |
3d39ac53 | 318 | int err = 0; |
e195fac8 NK |
319 | char nm[PATH_MAX]; |
320 | struct dso *pos; | |
3d39ac53 ACM |
321 | u16 kmisc = PERF_RECORD_MISC_KERNEL, |
322 | umisc = PERF_RECORD_MISC_USER; | |
323 | ||
324 | if (!machine__is_host(machine)) { | |
325 | kmisc = PERF_RECORD_MISC_GUEST_KERNEL; | |
326 | umisc = PERF_RECORD_MISC_GUEST_USER; | |
327 | } | |
e195fac8 | 328 | |
3d39ac53 | 329 | dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
e195fac8 NK |
330 | const char *name; |
331 | size_t name_len; | |
fd786fac | 332 | bool in_kernel = false; |
e195fac8 | 333 | |
6ae98ba6 | 334 | if (!pos->hit && !dso__is_vdso(pos)) |
e195fac8 NK |
335 | continue; |
336 | ||
337 | if (dso__is_vdso(pos)) { | |
338 | name = pos->short_name; | |
70a2cba9 | 339 | name_len = pos->short_name_len; |
e195fac8 NK |
340 | } else if (dso__is_kcore(pos)) { |
341 | machine__mmap_name(machine, nm, sizeof(nm)); | |
342 | name = nm; | |
70a2cba9 | 343 | name_len = strlen(nm); |
e195fac8 NK |
344 | } else { |
345 | name = pos->long_name; | |
70a2cba9 | 346 | name_len = pos->long_name_len; |
e195fac8 NK |
347 | } |
348 | ||
fd786fac WN |
349 | in_kernel = pos->kernel || |
350 | is_kernel_module(name, | |
351 | PERF_RECORD_MISC_CPUMODE_UNKNOWN); | |
3d39ac53 | 352 | err = write_buildid(name, name_len, pos->build_id, machine->pid, |
fd786fac | 353 | in_kernel ? kmisc : umisc, fd); |
e195fac8 | 354 | if (err) |
3d39ac53 | 355 | break; |
e195fac8 NK |
356 | } |
357 | ||
e195fac8 NK |
358 | return err; |
359 | } | |
360 | ||
ccebbeb6 DCC |
361 | int perf_session__write_buildid_table(struct perf_session *session, |
362 | struct feat_fd *fd) | |
e195fac8 NK |
363 | { |
364 | struct rb_node *nd; | |
365 | int err = machine__write_buildid_table(&session->machines.host, fd); | |
366 | ||
367 | if (err) | |
368 | return err; | |
369 | ||
370 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
371 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
372 | err = machine__write_buildid_table(pos, fd); | |
373 | if (err) | |
374 | break; | |
375 | } | |
376 | return err; | |
377 | } | |
378 | ||
379 | static int __dsos__hit_all(struct list_head *head) | |
380 | { | |
381 | struct dso *pos; | |
382 | ||
383 | list_for_each_entry(pos, head, node) | |
384 | pos->hit = true; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static int machine__hit_all_dsos(struct machine *machine) | |
390 | { | |
3d39ac53 | 391 | return __dsos__hit_all(&machine->dsos.head); |
e195fac8 NK |
392 | } |
393 | ||
394 | int dsos__hit_all(struct perf_session *session) | |
395 | { | |
396 | struct rb_node *nd; | |
397 | int err; | |
398 | ||
399 | err = machine__hit_all_dsos(&session->machines.host); | |
400 | if (err) | |
401 | return err; | |
402 | ||
403 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
404 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
405 | ||
406 | err = machine__hit_all_dsos(pos); | |
407 | if (err) | |
408 | return err; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
73c5d224 NK |
414 | void disable_buildid_cache(void) |
415 | { | |
416 | no_buildid_cache = true; | |
417 | } | |
418 | ||
1f3736c9 | 419 | static bool lsdir_bid_head_filter(const char *name __maybe_unused, |
767fe71b | 420 | struct dirent *d) |
1f3736c9 MH |
421 | { |
422 | return (strlen(d->d_name) == 2) && | |
423 | isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); | |
424 | } | |
425 | ||
426 | static bool lsdir_bid_tail_filter(const char *name __maybe_unused, | |
767fe71b | 427 | struct dirent *d) |
1f3736c9 MH |
428 | { |
429 | int i = 0; | |
430 | while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) | |
431 | i++; | |
432 | return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); | |
433 | } | |
434 | ||
c3492a3a | 435 | struct strlist *build_id_cache__list_all(bool validonly) |
1f3736c9 MH |
436 | { |
437 | struct strlist *toplist, *linklist = NULL, *bidlist; | |
438 | struct str_node *nd, *nd2; | |
439 | char *topdir, *linkdir = NULL; | |
440 | char sbuild_id[SBUILD_ID_SIZE]; | |
441 | ||
c3492a3a MH |
442 | /* for filename__ functions */ |
443 | if (validonly) | |
444 | symbol__init(NULL); | |
445 | ||
1f3736c9 MH |
446 | /* Open the top-level directory */ |
447 | if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) | |
448 | return NULL; | |
449 | ||
450 | bidlist = strlist__new(NULL, NULL); | |
451 | if (!bidlist) | |
452 | goto out; | |
453 | ||
454 | toplist = lsdir(topdir, lsdir_bid_head_filter); | |
455 | if (!toplist) { | |
456 | pr_debug("Error in lsdir(%s): %d\n", topdir, errno); | |
457 | /* If there is no buildid cache, return an empty list */ | |
458 | if (errno == ENOENT) | |
459 | goto out; | |
460 | goto err_out; | |
461 | } | |
462 | ||
463 | strlist__for_each_entry(nd, toplist) { | |
464 | if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) | |
465 | goto err_out; | |
466 | /* Open the lower-level directory */ | |
467 | linklist = lsdir(linkdir, lsdir_bid_tail_filter); | |
468 | if (!linklist) { | |
469 | pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); | |
470 | goto err_out; | |
471 | } | |
472 | strlist__for_each_entry(nd2, linklist) { | |
473 | if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", | |
474 | nd->s, nd2->s) != SBUILD_ID_SIZE - 1) | |
475 | goto err_out; | |
c3492a3a MH |
476 | if (validonly && !build_id_cache__valid_id(sbuild_id)) |
477 | continue; | |
1f3736c9 MH |
478 | if (strlist__add(bidlist, sbuild_id) < 0) |
479 | goto err_out; | |
480 | } | |
481 | strlist__delete(linklist); | |
482 | zfree(&linkdir); | |
483 | } | |
484 | ||
485 | out_free: | |
486 | strlist__delete(toplist); | |
487 | out: | |
488 | free(topdir); | |
489 | ||
490 | return bidlist; | |
491 | ||
492 | err_out: | |
493 | strlist__delete(linklist); | |
494 | zfree(&linkdir); | |
495 | strlist__delete(bidlist); | |
496 | bidlist = NULL; | |
497 | goto out_free; | |
498 | } | |
499 | ||
a598180a MH |
500 | static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) |
501 | { | |
502 | size_t i; | |
503 | ||
504 | for (i = 0; i < len; i++) { | |
505 | if (!isxdigit(maybe_sbuild_id[i])) | |
506 | return false; | |
507 | } | |
508 | return true; | |
509 | } | |
510 | ||
511 | /* Return the valid complete build-id */ | |
512 | char *build_id_cache__complement(const char *incomplete_sbuild_id) | |
513 | { | |
514 | struct strlist *bidlist; | |
515 | struct str_node *nd, *cand = NULL; | |
516 | char *sbuild_id = NULL; | |
517 | size_t len = strlen(incomplete_sbuild_id); | |
518 | ||
519 | if (len >= SBUILD_ID_SIZE || | |
520 | !str_is_build_id(incomplete_sbuild_id, len)) | |
521 | return NULL; | |
522 | ||
523 | bidlist = build_id_cache__list_all(true); | |
524 | if (!bidlist) | |
525 | return NULL; | |
526 | ||
527 | strlist__for_each_entry(nd, bidlist) { | |
528 | if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) | |
529 | continue; | |
530 | if (cand) { /* Error: There are more than 2 candidates. */ | |
531 | cand = NULL; | |
532 | break; | |
533 | } | |
534 | cand = nd; | |
535 | } | |
536 | if (cand) | |
537 | sbuild_id = strdup(cand->s); | |
538 | strlist__delete(bidlist); | |
539 | ||
540 | return sbuild_id; | |
541 | } | |
542 | ||
4698b8b7 | 543 | char *build_id_cache__cachedir(const char *sbuild_id, const char *name, |
f045b8c4 KJ |
544 | struct nsinfo *nsi, bool is_kallsyms, |
545 | bool is_vdso) | |
8d8c8e4c MH |
546 | { |
547 | char *realname = (char *)name, *filename; | |
548 | bool slash = is_kallsyms || is_vdso; | |
549 | ||
550 | if (!slash) { | |
f045b8c4 | 551 | realname = nsinfo__realpath(name, nsi); |
8d8c8e4c MH |
552 | if (!realname) |
553 | return NULL; | |
554 | } | |
555 | ||
01412261 MH |
556 | if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", |
557 | is_vdso ? DSO__NAME_VDSO : realname, | |
558 | sbuild_id ? "/" : "", sbuild_id ?: "") < 0) | |
8d8c8e4c MH |
559 | filename = NULL; |
560 | ||
561 | if (!slash) | |
562 | free(realname); | |
563 | ||
564 | return filename; | |
565 | } | |
566 | ||
f045b8c4 | 567 | int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, |
8d8c8e4c MH |
568 | struct strlist **result) |
569 | { | |
8d8c8e4c | 570 | char *dir_name; |
8d8c8e4c MH |
571 | int ret = 0; |
572 | ||
f045b8c4 | 573 | dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); |
d65444d2 MH |
574 | if (!dir_name) |
575 | return -ENOMEM; | |
8d8c8e4c | 576 | |
d65444d2 MH |
577 | *result = lsdir(dir_name, lsdir_no_dot_filter); |
578 | if (!*result) | |
8d8c8e4c | 579 | ret = -errno; |
8d8c8e4c | 580 | free(dir_name); |
8d8c8e4c MH |
581 | |
582 | return ret; | |
583 | } | |
584 | ||
1c1a3a47 | 585 | #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) |
6430a94e | 586 | static int build_id_cache__add_sdt_cache(const char *sbuild_id, |
f045b8c4 KJ |
587 | const char *realname, |
588 | struct nsinfo *nsi) | |
6430a94e MH |
589 | { |
590 | struct probe_cache *cache; | |
591 | int ret; | |
f045b8c4 | 592 | struct nscookie nsc; |
6430a94e | 593 | |
f045b8c4 | 594 | cache = probe_cache__new(sbuild_id, nsi); |
6430a94e MH |
595 | if (!cache) |
596 | return -1; | |
597 | ||
f045b8c4 | 598 | nsinfo__mountns_enter(nsi, &nsc); |
6430a94e | 599 | ret = probe_cache__scan_sdt(cache, realname); |
f045b8c4 | 600 | nsinfo__mountns_exit(&nsc); |
6430a94e | 601 | if (ret >= 0) { |
f9655200 | 602 | pr_debug4("Found %d SDTs in %s\n", ret, realname); |
6430a94e MH |
603 | if (probe_cache__commit(cache) < 0) |
604 | ret = -1; | |
605 | } | |
606 | probe_cache__delete(cache); | |
607 | return ret; | |
608 | } | |
609 | #else | |
f045b8c4 | 610 | #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) |
6430a94e MH |
611 | #endif |
612 | ||
d2396999 KJ |
613 | static char *build_id_cache__find_debug(const char *sbuild_id, |
614 | struct nsinfo *nsi) | |
615 | { | |
616 | char *realname = NULL; | |
617 | char *debugfile; | |
618 | struct nscookie nsc; | |
619 | size_t len = 0; | |
620 | ||
621 | debugfile = calloc(1, PATH_MAX); | |
622 | if (!debugfile) | |
623 | goto out; | |
624 | ||
625 | len = __symbol__join_symfs(debugfile, PATH_MAX, | |
626 | "/usr/lib/debug/.build-id/"); | |
627 | snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, | |
628 | sbuild_id + 2); | |
629 | ||
630 | nsinfo__mountns_enter(nsi, &nsc); | |
631 | realname = realpath(debugfile, NULL); | |
632 | if (realname && access(realname, R_OK)) | |
633 | zfree(&realname); | |
634 | nsinfo__mountns_exit(&nsc); | |
635 | out: | |
636 | free(debugfile); | |
637 | return realname; | |
638 | } | |
639 | ||
e35f7362 | 640 | int build_id_cache__add_s(const char *sbuild_id, const char *name, |
f045b8c4 | 641 | struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) |
e195fac8 NK |
642 | { |
643 | const size_t size = PATH_MAX; | |
8d8c8e4c | 644 | char *realname = NULL, *filename = NULL, *dir_name = NULL, |
01412261 | 645 | *linkname = zalloc(size), *tmp; |
d2396999 | 646 | char *debugfile = NULL; |
8d8c8e4c | 647 | int err = -1; |
e195fac8 | 648 | |
8d8c8e4c | 649 | if (!is_kallsyms) { |
f045b8c4 KJ |
650 | if (!is_vdso) |
651 | realname = nsinfo__realpath(name, nsi); | |
652 | else | |
653 | realname = realpath(name, NULL); | |
8d8c8e4c MH |
654 | if (!realname) |
655 | goto out_free; | |
656 | } | |
e195fac8 | 657 | |
f045b8c4 KJ |
658 | dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, |
659 | is_vdso); | |
8d8c8e4c | 660 | if (!dir_name) |
e195fac8 NK |
661 | goto out_free; |
662 | ||
01412261 MH |
663 | /* Remove old style build-id cache */ |
664 | if (is_regular_file(dir_name)) | |
665 | if (unlink(dir_name)) | |
666 | goto out_free; | |
667 | ||
8d8c8e4c | 668 | if (mkdir_p(dir_name, 0755)) |
e195fac8 NK |
669 | goto out_free; |
670 | ||
01412261 MH |
671 | /* Save the allocated buildid dirname */ |
672 | if (asprintf(&filename, "%s/%s", dir_name, | |
d2396999 KJ |
673 | build_id_cache__basename(is_kallsyms, is_vdso, |
674 | false)) < 0) { | |
8d8c8e4c MH |
675 | filename = NULL; |
676 | goto out_free; | |
677 | } | |
e195fac8 NK |
678 | |
679 | if (access(filename, F_OK)) { | |
680 | if (is_kallsyms) { | |
f045b8c4 KJ |
681 | if (copyfile("/proc/kallsyms", filename)) |
682 | goto out_free; | |
683 | } else if (nsi && nsi->need_setns) { | |
684 | if (copyfile_ns(name, filename, nsi)) | |
e195fac8 | 685 | goto out_free; |
0635b0f7 MV |
686 | } else if (link(realname, filename) && errno != EEXIST && |
687 | copyfile(name, filename)) | |
e195fac8 NK |
688 | goto out_free; |
689 | } | |
690 | ||
d2396999 KJ |
691 | /* Some binaries are stripped, but have .debug files with their symbol |
692 | * table. Check to see if we can locate one of those, since the elf | |
693 | * file itself may not be very useful to users of our tools without a | |
694 | * symtab. | |
695 | */ | |
696 | if (!is_kallsyms && !is_vdso && | |
697 | strncmp(".ko", name + strlen(name) - 3, 3)) { | |
698 | debugfile = build_id_cache__find_debug(sbuild_id, nsi); | |
699 | if (debugfile) { | |
700 | zfree(&filename); | |
701 | if (asprintf(&filename, "%s/%s", dir_name, | |
702 | build_id_cache__basename(false, false, true)) < 0) { | |
703 | filename = NULL; | |
704 | goto out_free; | |
705 | } | |
706 | if (access(filename, F_OK)) { | |
707 | if (nsi && nsi->need_setns) { | |
708 | if (copyfile_ns(debugfile, filename, | |
709 | nsi)) | |
710 | goto out_free; | |
711 | } else if (link(debugfile, filename) && | |
712 | errno != EEXIST && | |
713 | copyfile(debugfile, filename)) | |
714 | goto out_free; | |
715 | } | |
716 | } | |
717 | } | |
718 | ||
01412261 | 719 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd MH |
720 | goto out_free; |
721 | tmp = strrchr(linkname, '/'); | |
722 | *tmp = '\0'; | |
e195fac8 NK |
723 | |
724 | if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) | |
725 | goto out_free; | |
726 | ||
5cb113fd | 727 | *tmp = '/'; |
01412261 MH |
728 | tmp = dir_name + strlen(buildid_dir) - 5; |
729 | memcpy(tmp, "../..", 5); | |
e195fac8 | 730 | |
01412261 | 731 | if (symlink(tmp, linkname) == 0) |
e195fac8 | 732 | err = 0; |
6430a94e MH |
733 | |
734 | /* Update SDT cache : error is just warned */ | |
f045b8c4 KJ |
735 | if (realname && |
736 | build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) | |
f9655200 | 737 | pr_debug4("Failed to update/scan SDT cache for %s\n", realname); |
6430a94e | 738 | |
e195fac8 NK |
739 | out_free: |
740 | if (!is_kallsyms) | |
741 | free(realname); | |
742 | free(filename); | |
d2396999 | 743 | free(debugfile); |
8d8c8e4c | 744 | free(dir_name); |
e195fac8 NK |
745 | free(linkname); |
746 | return err; | |
747 | } | |
748 | ||
749 | static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size, | |
f045b8c4 KJ |
750 | const char *name, struct nsinfo *nsi, |
751 | bool is_kallsyms, bool is_vdso) | |
e195fac8 | 752 | { |
d77fac7f | 753 | char sbuild_id[SBUILD_ID_SIZE]; |
e195fac8 NK |
754 | |
755 | build_id__sprintf(build_id, build_id_size, sbuild_id); | |
756 | ||
f045b8c4 KJ |
757 | return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, |
758 | is_vdso); | |
e195fac8 NK |
759 | } |
760 | ||
a50d11a1 MH |
761 | bool build_id_cache__cached(const char *sbuild_id) |
762 | { | |
763 | bool ret = false; | |
01412261 | 764 | char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); |
a50d11a1 MH |
765 | |
766 | if (filename && !access(filename, F_OK)) | |
767 | ret = true; | |
768 | free(filename); | |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
e35f7362 | 773 | int build_id_cache__remove_s(const char *sbuild_id) |
e195fac8 NK |
774 | { |
775 | const size_t size = PATH_MAX; | |
776 | char *filename = zalloc(size), | |
5cb113fd | 777 | *linkname = zalloc(size), *tmp; |
e195fac8 NK |
778 | int err = -1; |
779 | ||
780 | if (filename == NULL || linkname == NULL) | |
781 | goto out_free; | |
782 | ||
01412261 | 783 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd | 784 | goto out_free; |
e195fac8 NK |
785 | |
786 | if (access(linkname, F_OK)) | |
787 | goto out_free; | |
788 | ||
789 | if (readlink(linkname, filename, size - 1) < 0) | |
790 | goto out_free; | |
791 | ||
792 | if (unlink(linkname)) | |
793 | goto out_free; | |
794 | ||
795 | /* | |
796 | * Since the link is relative, we must make it absolute: | |
797 | */ | |
5cb113fd MH |
798 | tmp = strrchr(linkname, '/') + 1; |
799 | snprintf(tmp, size - (tmp - linkname), "%s", filename); | |
e195fac8 | 800 | |
01412261 | 801 | if (rm_rf(linkname)) |
e195fac8 NK |
802 | goto out_free; |
803 | ||
804 | err = 0; | |
805 | out_free: | |
806 | free(filename); | |
807 | free(linkname); | |
808 | return err; | |
809 | } | |
810 | ||
e35f7362 | 811 | static int dso__cache_build_id(struct dso *dso, struct machine *machine) |
e195fac8 | 812 | { |
01412261 | 813 | bool is_kallsyms = dso__is_kallsyms(dso); |
e195fac8 NK |
814 | bool is_vdso = dso__is_vdso(dso); |
815 | const char *name = dso->long_name; | |
816 | char nm[PATH_MAX]; | |
817 | ||
818 | if (dso__is_kcore(dso)) { | |
819 | is_kallsyms = true; | |
820 | machine__mmap_name(machine, nm, sizeof(nm)); | |
821 | name = nm; | |
822 | } | |
823 | return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name, | |
f045b8c4 | 824 | dso->nsinfo, is_kallsyms, is_vdso); |
e195fac8 NK |
825 | } |
826 | ||
827 | static int __dsos__cache_build_ids(struct list_head *head, | |
e35f7362 | 828 | struct machine *machine) |
e195fac8 NK |
829 | { |
830 | struct dso *pos; | |
831 | int err = 0; | |
832 | ||
833 | dsos__for_each_with_build_id(pos, head) | |
e35f7362 | 834 | if (dso__cache_build_id(pos, machine)) |
e195fac8 NK |
835 | err = -1; |
836 | ||
837 | return err; | |
838 | } | |
839 | ||
e35f7362 | 840 | static int machine__cache_build_ids(struct machine *machine) |
e195fac8 | 841 | { |
3d39ac53 | 842 | return __dsos__cache_build_ids(&machine->dsos.head, machine); |
e195fac8 NK |
843 | } |
844 | ||
845 | int perf_session__cache_build_ids(struct perf_session *session) | |
846 | { | |
847 | struct rb_node *nd; | |
848 | int ret; | |
e195fac8 | 849 | |
73c5d224 NK |
850 | if (no_buildid_cache) |
851 | return 0; | |
852 | ||
498922ad | 853 | if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
e195fac8 NK |
854 | return -1; |
855 | ||
e35f7362 | 856 | ret = machine__cache_build_ids(&session->machines.host); |
e195fac8 NK |
857 | |
858 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
859 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
e35f7362 | 860 | ret |= machine__cache_build_ids(pos); |
e195fac8 NK |
861 | } |
862 | return ret ? -1 : 0; | |
863 | } | |
864 | ||
865 | static bool machine__read_build_ids(struct machine *machine, bool with_hits) | |
866 | { | |
3d39ac53 | 867 | return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
e195fac8 NK |
868 | } |
869 | ||
870 | bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) | |
871 | { | |
872 | struct rb_node *nd; | |
873 | bool ret = machine__read_build_ids(&session->machines.host, with_hits); | |
874 | ||
875 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
876 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
877 | ret |= machine__read_build_ids(pos, with_hits); | |
878 | } | |
879 | ||
880 | return ret; | |
881 | } |