1
2#include <asm/bug.h>
3#include <linux/kernel.h>
4#include <linux/string.h>
5#include <linux/zalloc.h>
6#include <sys/time.h>
7#include <sys/resource.h>
8#include <sys/types.h>
9#include <sys/stat.h>
10#include <unistd.h>
11#include <errno.h>
12#include <fcntl.h>
13#include <stdlib.h>
14#ifdef HAVE_LIBBPF_SUPPORT
15#include <bpf/libbpf.h>
16#include "bpf-event.h"
17#include "bpf-utils.h"
18#endif
19#include "compress.h"
20#include "env.h"
21#include "namespaces.h"
22#include "path.h"
23#include "map.h"
24#include "symbol.h"
25#include "srcline.h"
26#include "dso.h"
27#include "dsos.h"
28#include "machine.h"
29#include "auxtrace.h"
30#include "util.h"
31#include "debug.h"
32#include "string2.h"
33#include "vdso.h"
34
35static const char * const debuglink_paths[] = {
36 "%.0s%s",
37 "%s/%s",
38 "%s/.debug/%s",
39 "/usr/lib/debug%s/%s"
40};
41
42char dso__symtab_origin(const struct dso *dso)
43{
44 static const char origin[] = {
45 [DSO_BINARY_TYPE__KALLSYMS] = 'k',
46 [DSO_BINARY_TYPE__VMLINUX] = 'v',
47 [DSO_BINARY_TYPE__JAVA_JIT] = 'j',
48 [DSO_BINARY_TYPE__DEBUGLINK] = 'l',
49 [DSO_BINARY_TYPE__BUILD_ID_CACHE] = 'B',
50 [DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO] = 'D',
51 [DSO_BINARY_TYPE__FEDORA_DEBUGINFO] = 'f',
52 [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO] = 'u',
53 [DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO] = 'x',
54 [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO] = 'o',
55 [DSO_BINARY_TYPE__BUILDID_DEBUGINFO] = 'b',
56 [DSO_BINARY_TYPE__SYSTEM_PATH_DSO] = 'd',
57 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE] = 'K',
58 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP] = 'm',
59 [DSO_BINARY_TYPE__GUEST_KALLSYMS] = 'g',
60 [DSO_BINARY_TYPE__GUEST_KMODULE] = 'G',
61 [DSO_BINARY_TYPE__GUEST_KMODULE_COMP] = 'M',
62 [DSO_BINARY_TYPE__GUEST_VMLINUX] = 'V',
63 };
64
65 if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
66 return '!';
67 return origin[dso->symtab_type];
68}
69
70int dso__read_binary_type_filename(const struct dso *dso,
71 enum dso_binary_type type,
72 char *root_dir, char *filename, size_t size)
73{
74 char build_id_hex[SBUILD_ID_SIZE];
75 int ret = 0;
76 size_t len;
77
78 switch (type) {
79 case DSO_BINARY_TYPE__DEBUGLINK:
80 {
81 const char *last_slash;
82 char dso_dir[PATH_MAX];
83 char symfile[PATH_MAX];
84 unsigned int i;
85
86 len = __symbol__join_symfs(filename, size, dso->long_name);
87 last_slash = filename + len;
88 while (last_slash != filename && *last_slash != '/')
89 last_slash--;
90
91 strncpy(dso_dir, filename, last_slash - filename);
92 dso_dir[last_slash-filename] = '\0';
93
94 if (!is_regular_file(filename)) {
95 ret = -1;
96 break;
97 }
98
99 ret = filename__read_debuglink(filename, symfile, PATH_MAX);
100 if (ret)
101 break;
102
103
104 ret = -1;
105 for (i = 0; i < ARRAY_SIZE(debuglink_paths); i++) {
106 snprintf(filename, size,
107 debuglink_paths[i], dso_dir, symfile);
108 if (is_regular_file(filename)) {
109 ret = 0;
110 break;
111 }
112 }
113
114 break;
115 }
116 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
117 if (dso__build_id_filename(dso, filename, size, false) == NULL)
118 ret = -1;
119 break;
120
121 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
122 if (dso__build_id_filename(dso, filename, size, true) == NULL)
123 ret = -1;
124 break;
125
126 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
127 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
128 snprintf(filename + len, size - len, "%s.debug", dso->long_name);
129 break;
130
131 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
132 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
133 snprintf(filename + len, size - len, "%s", dso->long_name);
134 break;
135
136 case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
137
138
139
140
141
142 if (strlen(dso->long_name) < 9 ||
143 strncmp(dso->long_name, "/usr/lib/", 9)) {
144 ret = -1;
145 break;
146 }
147 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
148 snprintf(filename + len, size - len, "%s", dso->long_name + 4);
149 break;
150
151 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
152 {
153 const char *last_slash;
154 size_t dir_size;
155
156 last_slash = dso->long_name + dso->long_name_len;
157 while (last_slash != dso->long_name && *last_slash != '/')
158 last_slash--;
159
160 len = __symbol__join_symfs(filename, size, "");
161 dir_size = last_slash - dso->long_name + 2;
162 if (dir_size > (size - len)) {
163 ret = -1;
164 break;
165 }
166 len += scnprintf(filename + len, dir_size, "%s", dso->long_name);
167 len += scnprintf(filename + len , size - len, ".debug%s",
168 last_slash);
169 break;
170 }
171
172 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
173 if (!dso->has_build_id) {
174 ret = -1;
175 break;
176 }
177
178 build_id__sprintf(&dso->bid, build_id_hex);
179 len = __symbol__join_symfs(filename, size, "/usr/lib/debug/.build-id/");
180 snprintf(filename + len, size - len, "%.2s/%s.debug",
181 build_id_hex, build_id_hex + 2);
182 break;
183
184 case DSO_BINARY_TYPE__VMLINUX:
185 case DSO_BINARY_TYPE__GUEST_VMLINUX:
186 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
187 __symbol__join_symfs(filename, size, dso->long_name);
188 break;
189
190 case DSO_BINARY_TYPE__GUEST_KMODULE:
191 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
192 path__join3(filename, size, symbol_conf.symfs,
193 root_dir, dso->long_name);
194 break;
195
196 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
197 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
198 __symbol__join_symfs(filename, size, dso->long_name);
199 break;
200
201 case DSO_BINARY_TYPE__KCORE:
202 case DSO_BINARY_TYPE__GUEST_KCORE:
203 snprintf(filename, size, "%s", dso->long_name);
204 break;
205
206 default:
207 case DSO_BINARY_TYPE__KALLSYMS:
208 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
209 case DSO_BINARY_TYPE__JAVA_JIT:
210 case DSO_BINARY_TYPE__BPF_PROG_INFO:
211 case DSO_BINARY_TYPE__BPF_IMAGE:
212 case DSO_BINARY_TYPE__OOL:
213 case DSO_BINARY_TYPE__NOT_FOUND:
214 ret = -1;
215 break;
216 }
217
218 return ret;
219}
220
221enum {
222 COMP_ID__NONE = 0,
223};
224
225static const struct {
226 const char *fmt;
227 int (*decompress)(const char *input, int output);
228 bool (*is_compressed)(const char *input);
229} compressions[] = {
230 [COMP_ID__NONE] = { .fmt = NULL, },
231#ifdef HAVE_ZLIB_SUPPORT
232 { "gz", gzip_decompress_to_file, gzip_is_compressed },
233#endif
234#ifdef HAVE_LZMA_SUPPORT
235 { "xz", lzma_decompress_to_file, lzma_is_compressed },
236#endif
237 { NULL, NULL, NULL },
238};
239
240static int is_supported_compression(const char *ext)
241{
242 unsigned i;
243
244 for (i = 1; compressions[i].fmt; i++) {
245 if (!strcmp(ext, compressions[i].fmt))
246 return i;
247 }
248 return COMP_ID__NONE;
249}
250
251bool is_kernel_module(const char *pathname, int cpumode)
252{
253 struct kmod_path m;
254 int mode = cpumode & PERF_RECORD_MISC_CPUMODE_MASK;
255
256 WARN_ONCE(mode != cpumode,
257 "Internal error: passing unmasked cpumode (%x) to is_kernel_module",
258 cpumode);
259
260 switch (mode) {
261 case PERF_RECORD_MISC_USER:
262 case PERF_RECORD_MISC_HYPERVISOR:
263 case PERF_RECORD_MISC_GUEST_USER:
264 return false;
265
266 default:
267 if (kmod_path__parse(&m, pathname)) {
268 pr_err("Failed to check whether %s is a kernel module or not. Assume it is.",
269 pathname);
270 return true;
271 }
272 }
273
274 return m.kmod;
275}
276
277bool dso__needs_decompress(struct dso *dso)
278{
279 return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
280 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
281}
282
283int filename__decompress(const char *name, char *pathname,
284 size_t len, int comp, int *err)
285{
286 char tmpbuf[] = KMOD_DECOMP_NAME;
287 int fd = -1;
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302 if (!compressions[comp].is_compressed(name))
303 return open(name, O_RDONLY);
304
305 fd = mkstemp(tmpbuf);
306 if (fd < 0) {
307 *err = errno;
308 return -1;
309 }
310
311 if (compressions[comp].decompress(name, fd)) {
312 *err = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
313 close(fd);
314 fd = -1;
315 }
316
317 if (!pathname || (fd < 0))
318 unlink(tmpbuf);
319
320 if (pathname && (fd >= 0))
321 strlcpy(pathname, tmpbuf, len);
322
323 return fd;
324}
325
326static int decompress_kmodule(struct dso *dso, const char *name,
327 char *pathname, size_t len)
328{
329 if (!dso__needs_decompress(dso))
330 return -1;
331
332 if (dso->comp == COMP_ID__NONE)
333 return -1;
334
335 return filename__decompress(name, pathname, len, dso->comp,
336 &dso->load_errno);
337}
338
339int dso__decompress_kmodule_fd(struct dso *dso, const char *name)
340{
341 return decompress_kmodule(dso, name, NULL, 0);
342}
343
344int dso__decompress_kmodule_path(struct dso *dso, const char *name,
345 char *pathname, size_t len)
346{
347 int fd = decompress_kmodule(dso, name, pathname, len);
348
349 close(fd);
350 return fd >= 0 ? 0 : -1;
351}
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369int __kmod_path__parse(struct kmod_path *m, const char *path,
370 bool alloc_name)
371{
372 const char *name = strrchr(path, '/');
373 const char *ext = strrchr(path, '.');
374 bool is_simple_name = false;
375
376 memset(m, 0x0, sizeof(*m));
377 name = name ? name + 1 : path;
378
379
380
381
382
383
384
385
386
387 if (name[0] == '[') {
388 is_simple_name = true;
389 if ((strncmp(name, "[kernel.kallsyms]", 17) == 0) ||
390 (strncmp(name, "[guest.kernel.kallsyms", 22) == 0) ||
391 (strncmp(name, "[vdso]", 6) == 0) ||
392 (strncmp(name, "[vdso32]", 8) == 0) ||
393 (strncmp(name, "[vdsox32]", 9) == 0) ||
394 (strncmp(name, "[vsyscall]", 10) == 0)) {
395 m->kmod = false;
396
397 } else
398 m->kmod = true;
399 }
400
401
402 if ((ext == NULL) || is_simple_name) {
403 if (alloc_name) {
404 m->name = strdup(name);
405 return m->name ? 0 : -ENOMEM;
406 }
407 return 0;
408 }
409
410 m->comp = is_supported_compression(ext + 1);
411 if (m->comp > COMP_ID__NONE)
412 ext -= 3;
413
414
415 if (ext > name)
416 m->kmod = !strncmp(ext, ".ko", 3);
417
418 if (alloc_name) {
419 if (m->kmod) {
420 if (asprintf(&m->name, "[%.*s]", (int) (ext - name), name) == -1)
421 return -ENOMEM;
422 } else {
423 if (asprintf(&m->name, "%s", name) == -1)
424 return -ENOMEM;
425 }
426
427 strreplace(m->name, '-', '_');
428 }
429
430 return 0;
431}
432
433void dso__set_module_info(struct dso *dso, struct kmod_path *m,
434 struct machine *machine)
435{
436 if (machine__is_host(machine))
437 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
438 else
439 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
440
441
442 if (m->kmod && m->comp) {
443 dso->symtab_type++;
444 dso->comp = m->comp;
445 }
446
447 dso__set_short_name(dso, strdup(m->name), true);
448}
449
450
451
452
453static LIST_HEAD(dso__data_open);
454static long dso__data_open_cnt;
455static pthread_mutex_t dso__data_open_lock = PTHREAD_MUTEX_INITIALIZER;
456
457static void dso__list_add(struct dso *dso)
458{
459 list_add_tail(&dso->data.open_entry, &dso__data_open);
460 dso__data_open_cnt++;
461}
462
463static void dso__list_del(struct dso *dso)
464{
465 list_del_init(&dso->data.open_entry);
466 WARN_ONCE(dso__data_open_cnt <= 0,
467 "DSO data fd counter out of bounds.");
468 dso__data_open_cnt--;
469}
470
471static void close_first_dso(void);
472
473static int do_open(char *name)
474{
475 int fd;
476 char sbuf[STRERR_BUFSIZE];
477
478 do {
479 fd = open(name, O_RDONLY|O_CLOEXEC);
480 if (fd >= 0)
481 return fd;
482
483 pr_debug("dso open failed: %s\n",
484 str_error_r(errno, sbuf, sizeof(sbuf)));
485 if (!dso__data_open_cnt || errno != EMFILE)
486 break;
487
488 close_first_dso();
489 } while (1);
490
491 return -1;
492}
493
494static int __open_dso(struct dso *dso, struct machine *machine)
495{
496 int fd = -EINVAL;
497 char *root_dir = (char *)"";
498 char *name = malloc(PATH_MAX);
499 bool decomp = false;
500
501 if (!name)
502 return -ENOMEM;
503
504 if (machine)
505 root_dir = machine->root_dir;
506
507 if (dso__read_binary_type_filename(dso, dso->binary_type,
508 root_dir, name, PATH_MAX))
509 goto out;
510
511 if (!is_regular_file(name))
512 goto out;
513
514 if (dso__needs_decompress(dso)) {
515 char newpath[KMOD_DECOMP_LEN];
516 size_t len = sizeof(newpath);
517
518 if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
519 fd = -dso->load_errno;
520 goto out;
521 }
522
523 decomp = true;
524 strcpy(name, newpath);
525 }
526
527 fd = do_open(name);
528
529 if (decomp)
530 unlink(name);
531
532out:
533 free(name);
534 return fd;
535}
536
537static void check_data_close(void);
538
539
540
541
542
543
544
545
546static int open_dso(struct dso *dso, struct machine *machine)
547{
548 int fd;
549 struct nscookie nsc;
550
551 if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
552 nsinfo__mountns_enter(dso->nsinfo, &nsc);
553 fd = __open_dso(dso, machine);
554 if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
555 nsinfo__mountns_exit(&nsc);
556
557 if (fd >= 0) {
558 dso__list_add(dso);
559
560
561
562
563 check_data_close();
564 }
565
566 return fd;
567}
568
569static void close_data_fd(struct dso *dso)
570{
571 if (dso->data.fd >= 0) {
572 close(dso->data.fd);
573 dso->data.fd = -1;
574 dso->data.file_size = 0;
575 dso__list_del(dso);
576 }
577}
578
579
580
581
582
583
584
585
586static void close_dso(struct dso *dso)
587{
588 close_data_fd(dso);
589}
590
591static void close_first_dso(void)
592{
593 struct dso *dso;
594
595 dso = list_first_entry(&dso__data_open, struct dso, data.open_entry);
596 close_dso(dso);
597}
598
599static rlim_t get_fd_limit(void)
600{
601 struct rlimit l;
602 rlim_t limit = 0;
603
604
605 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
606 if (l.rlim_cur == RLIM_INFINITY)
607 limit = l.rlim_cur;
608 else
609 limit = l.rlim_cur / 2;
610 } else {
611 pr_err("failed to get fd limit\n");
612 limit = 1;
613 }
614
615 return limit;
616}
617
618static rlim_t fd_limit;
619
620
621
622
623
624
625void reset_fd_limit(void)
626{
627 fd_limit = 0;
628}
629
630static bool may_cache_fd(void)
631{
632 if (!fd_limit)
633 fd_limit = get_fd_limit();
634
635 if (fd_limit == RLIM_INFINITY)
636 return true;
637
638 return fd_limit > (rlim_t) dso__data_open_cnt;
639}
640
641
642
643
644
645
646static void check_data_close(void)
647{
648 bool cache_fd = may_cache_fd();
649
650 if (!cache_fd)
651 close_first_dso();
652}
653
654
655
656
657
658
659
660void dso__data_close(struct dso *dso)
661{
662 pthread_mutex_lock(&dso__data_open_lock);
663 close_dso(dso);
664 pthread_mutex_unlock(&dso__data_open_lock);
665}
666
667static void try_to_open_dso(struct dso *dso, struct machine *machine)
668{
669 enum dso_binary_type binary_type_data[] = {
670 DSO_BINARY_TYPE__BUILD_ID_CACHE,
671 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
672 DSO_BINARY_TYPE__NOT_FOUND,
673 };
674 int i = 0;
675
676 if (dso->data.fd >= 0)
677 return;
678
679 if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) {
680 dso->data.fd = open_dso(dso, machine);
681 goto out;
682 }
683
684 do {
685 dso->binary_type = binary_type_data[i++];
686
687 dso->data.fd = open_dso(dso, machine);
688 if (dso->data.fd >= 0)
689 goto out;
690
691 } while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND);
692out:
693 if (dso->data.fd >= 0)
694 dso->data.status = DSO_DATA_STATUS_OK;
695 else
696 dso->data.status = DSO_DATA_STATUS_ERROR;
697}
698
699
700
701
702
703
704
705
706
707
708int dso__data_get_fd(struct dso *dso, struct machine *machine)
709{
710 if (dso->data.status == DSO_DATA_STATUS_ERROR)
711 return -1;
712
713 if (pthread_mutex_lock(&dso__data_open_lock) < 0)
714 return -1;
715
716 try_to_open_dso(dso, machine);
717
718 if (dso->data.fd < 0)
719 pthread_mutex_unlock(&dso__data_open_lock);
720
721 return dso->data.fd;
722}
723
724void dso__data_put_fd(struct dso *dso __maybe_unused)
725{
726 pthread_mutex_unlock(&dso__data_open_lock);
727}
728
729bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by)
730{
731 u32 flag = 1 << by;
732
733 if (dso->data.status_seen & flag)
734 return true;
735
736 dso->data.status_seen |= flag;
737
738 return false;
739}
740
741#ifdef HAVE_LIBBPF_SUPPORT
742static ssize_t bpf_read(struct dso *dso, u64 offset, char *data)
743{
744 struct bpf_prog_info_node *node;
745 ssize_t size = DSO__DATA_CACHE_SIZE;
746 u64 len;
747 u8 *buf;
748
749 node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id);
750 if (!node || !node->info_linear) {
751 dso->data.status = DSO_DATA_STATUS_ERROR;
752 return -1;
753 }
754
755 len = node->info_linear->info.jited_prog_len;
756 buf = (u8 *)(uintptr_t)node->info_linear->info.jited_prog_insns;
757
758 if (offset >= len)
759 return -1;
760
761 size = (ssize_t)min(len - offset, (u64)size);
762 memcpy(data, buf + offset, size);
763 return size;
764}
765
766static int bpf_size(struct dso *dso)
767{
768 struct bpf_prog_info_node *node;
769
770 node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id);
771 if (!node || !node->info_linear) {
772 dso->data.status = DSO_DATA_STATUS_ERROR;
773 return -1;
774 }
775
776 dso->data.file_size = node->info_linear->info.jited_prog_len;
777 return 0;
778}
779#endif
780
781static void
782dso_cache__free(struct dso *dso)
783{
784 struct rb_root *root = &dso->data.cache;
785 struct rb_node *next = rb_first(root);
786
787 pthread_mutex_lock(&dso->lock);
788 while (next) {
789 struct dso_cache *cache;
790
791 cache = rb_entry(next, struct dso_cache, rb_node);
792 next = rb_next(&cache->rb_node);
793 rb_erase(&cache->rb_node, root);
794 free(cache);
795 }
796 pthread_mutex_unlock(&dso->lock);
797}
798
799static struct dso_cache *__dso_cache__find(struct dso *dso, u64 offset)
800{
801 const struct rb_root *root = &dso->data.cache;
802 struct rb_node * const *p = &root->rb_node;
803 const struct rb_node *parent = NULL;
804 struct dso_cache *cache;
805
806 while (*p != NULL) {
807 u64 end;
808
809 parent = *p;
810 cache = rb_entry(parent, struct dso_cache, rb_node);
811 end = cache->offset + DSO__DATA_CACHE_SIZE;
812
813 if (offset < cache->offset)
814 p = &(*p)->rb_left;
815 else if (offset >= end)
816 p = &(*p)->rb_right;
817 else
818 return cache;
819 }
820
821 return NULL;
822}
823
824static struct dso_cache *
825dso_cache__insert(struct dso *dso, struct dso_cache *new)
826{
827 struct rb_root *root = &dso->data.cache;
828 struct rb_node **p = &root->rb_node;
829 struct rb_node *parent = NULL;
830 struct dso_cache *cache;
831 u64 offset = new->offset;
832
833 pthread_mutex_lock(&dso->lock);
834 while (*p != NULL) {
835 u64 end;
836
837 parent = *p;
838 cache = rb_entry(parent, struct dso_cache, rb_node);
839 end = cache->offset + DSO__DATA_CACHE_SIZE;
840
841 if (offset < cache->offset)
842 p = &(*p)->rb_left;
843 else if (offset >= end)
844 p = &(*p)->rb_right;
845 else
846 goto out;
847 }
848
849 rb_link_node(&new->rb_node, parent, p);
850 rb_insert_color(&new->rb_node, root);
851
852 cache = NULL;
853out:
854 pthread_mutex_unlock(&dso->lock);
855 return cache;
856}
857
858static ssize_t dso_cache__memcpy(struct dso_cache *cache, u64 offset, u8 *data,
859 u64 size, bool out)
860{
861 u64 cache_offset = offset - cache->offset;
862 u64 cache_size = min(cache->size - cache_offset, size);
863
864 if (out)
865 memcpy(data, cache->data + cache_offset, cache_size);
866 else
867 memcpy(cache->data + cache_offset, data, cache_size);
868 return cache_size;
869}
870
871static ssize_t file_read(struct dso *dso, struct machine *machine,
872 u64 offset, char *data)
873{
874 ssize_t ret;
875
876 pthread_mutex_lock(&dso__data_open_lock);
877
878
879
880
881
882 try_to_open_dso(dso, machine);
883
884 if (dso->data.fd < 0) {
885 dso->data.status = DSO_DATA_STATUS_ERROR;
886 ret = -errno;
887 goto out;
888 }
889
890 ret = pread(dso->data.fd, data, DSO__DATA_CACHE_SIZE, offset);
891out:
892 pthread_mutex_unlock(&dso__data_open_lock);
893 return ret;
894}
895
896static struct dso_cache *dso_cache__populate(struct dso *dso,
897 struct machine *machine,
898 u64 offset, ssize_t *ret)
899{
900 u64 cache_offset = offset & DSO__DATA_CACHE_MASK;
901 struct dso_cache *cache;
902 struct dso_cache *old;
903
904 cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
905 if (!cache) {
906 *ret = -ENOMEM;
907 return NULL;
908 }
909#ifdef HAVE_LIBBPF_SUPPORT
910 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
911 *ret = bpf_read(dso, cache_offset, cache->data);
912 else
913#endif
914 if (dso->binary_type == DSO_BINARY_TYPE__OOL)
915 *ret = DSO__DATA_CACHE_SIZE;
916 else
917 *ret = file_read(dso, machine, cache_offset, cache->data);
918
919 if (*ret <= 0) {
920 free(cache);
921 return NULL;
922 }
923
924 cache->offset = cache_offset;
925 cache->size = *ret;
926
927 old = dso_cache__insert(dso, cache);
928 if (old) {
929
930 free(cache);
931 cache = old;
932 }
933
934 return cache;
935}
936
937static struct dso_cache *dso_cache__find(struct dso *dso,
938 struct machine *machine,
939 u64 offset,
940 ssize_t *ret)
941{
942 struct dso_cache *cache = __dso_cache__find(dso, offset);
943
944 return cache ? cache : dso_cache__populate(dso, machine, offset, ret);
945}
946
947static ssize_t dso_cache_io(struct dso *dso, struct machine *machine,
948 u64 offset, u8 *data, ssize_t size, bool out)
949{
950 struct dso_cache *cache;
951 ssize_t ret = 0;
952
953 cache = dso_cache__find(dso, machine, offset, &ret);
954 if (!cache)
955 return ret;
956
957 return dso_cache__memcpy(cache, offset, data, size, out);
958}
959
960
961
962
963
964
965static ssize_t cached_io(struct dso *dso, struct machine *machine,
966 u64 offset, u8 *data, ssize_t size, bool out)
967{
968 ssize_t r = 0;
969 u8 *p = data;
970
971 do {
972 ssize_t ret;
973
974 ret = dso_cache_io(dso, machine, offset, p, size, out);
975 if (ret < 0)
976 return ret;
977
978
979 if (!ret)
980 break;
981
982 BUG_ON(ret > size);
983
984 r += ret;
985 p += ret;
986 offset += ret;
987 size -= ret;
988
989 } while (size);
990
991 return r;
992}
993
994static int file_size(struct dso *dso, struct machine *machine)
995{
996 int ret = 0;
997 struct stat st;
998 char sbuf[STRERR_BUFSIZE];
999
1000 pthread_mutex_lock(&dso__data_open_lock);
1001
1002
1003
1004
1005
1006 try_to_open_dso(dso, machine);
1007
1008 if (dso->data.fd < 0) {
1009 ret = -errno;
1010 dso->data.status = DSO_DATA_STATUS_ERROR;
1011 goto out;
1012 }
1013
1014 if (fstat(dso->data.fd, &st) < 0) {
1015 ret = -errno;
1016 pr_err("dso cache fstat failed: %s\n",
1017 str_error_r(errno, sbuf, sizeof(sbuf)));
1018 dso->data.status = DSO_DATA_STATUS_ERROR;
1019 goto out;
1020 }
1021 dso->data.file_size = st.st_size;
1022
1023out:
1024 pthread_mutex_unlock(&dso__data_open_lock);
1025 return ret;
1026}
1027
1028int dso__data_file_size(struct dso *dso, struct machine *machine)
1029{
1030 if (dso->data.file_size)
1031 return 0;
1032
1033 if (dso->data.status == DSO_DATA_STATUS_ERROR)
1034 return -1;
1035#ifdef HAVE_LIBBPF_SUPPORT
1036 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
1037 return bpf_size(dso);
1038#endif
1039 return file_size(dso, machine);
1040}
1041
1042
1043
1044
1045
1046
1047
1048
1049off_t dso__data_size(struct dso *dso, struct machine *machine)
1050{
1051 if (dso__data_file_size(dso, machine))
1052 return -1;
1053
1054
1055 return dso->data.file_size;
1056}
1057
1058static ssize_t data_read_write_offset(struct dso *dso, struct machine *machine,
1059 u64 offset, u8 *data, ssize_t size,
1060 bool out)
1061{
1062 if (dso__data_file_size(dso, machine))
1063 return -1;
1064
1065
1066 if (offset > dso->data.file_size)
1067 return -1;
1068
1069 if (offset + size < offset)
1070 return -1;
1071
1072 return cached_io(dso, machine, offset, data, size, out);
1073}
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
1087 u64 offset, u8 *data, ssize_t size)
1088{
1089 if (dso->data.status == DSO_DATA_STATUS_ERROR)
1090 return -1;
1091
1092 return data_read_write_offset(dso, machine, offset, data, size, true);
1093}
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
1106 struct machine *machine, u64 addr,
1107 u8 *data, ssize_t size)
1108{
1109 u64 offset = map->map_ip(map, addr);
1110 return dso__data_read_offset(dso, machine, offset, data, size);
1111}
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine,
1124 u64 offset, const u8 *data_in, ssize_t size)
1125{
1126 u8 *data = (u8 *)data_in;
1127
1128 if (dso->data.status == DSO_DATA_STATUS_ERROR)
1129 return -1;
1130
1131 return data_read_write_offset(dso, machine, offset, data, size, false);
1132}
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map,
1146 struct machine *machine, u64 addr,
1147 const u8 *data, ssize_t size)
1148{
1149 u64 offset = map->map_ip(map, addr);
1150 return dso__data_write_cache_offs(dso, machine, offset, data, size);
1151}
1152
1153struct map *dso__new_map(const char *name)
1154{
1155 struct map *map = NULL;
1156 struct dso *dso = dso__new(name);
1157
1158 if (dso) {
1159 map = map__new2(0, dso);
1160 dso__put(dso);
1161 }
1162
1163 return map;
1164}
1165
1166struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
1167 const char *short_name, int dso_type)
1168{
1169
1170
1171
1172 struct dso *dso = machine__findnew_dso(machine, name);
1173
1174
1175
1176
1177
1178 if (dso != NULL) {
1179 dso__set_short_name(dso, short_name, false);
1180 dso->kernel = dso_type;
1181 }
1182
1183 return dso;
1184}
1185
1186static void dso__set_long_name_id(struct dso *dso, const char *name, struct dso_id *id, bool name_allocated)
1187{
1188 struct rb_root *root = dso->root;
1189
1190 if (name == NULL)
1191 return;
1192
1193 if (dso->long_name_allocated)
1194 free((char *)dso->long_name);
1195
1196 if (root) {
1197 rb_erase(&dso->rb_node, root);
1198
1199
1200
1201
1202 RB_CLEAR_NODE(&dso->rb_node);
1203 dso->root = NULL;
1204 }
1205
1206 dso->long_name = name;
1207 dso->long_name_len = strlen(name);
1208 dso->long_name_allocated = name_allocated;
1209
1210 if (root)
1211 __dsos__findnew_link_by_longname_id(root, dso, NULL, id);
1212}
1213
1214void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated)
1215{
1216 dso__set_long_name_id(dso, name, NULL, name_allocated);
1217}
1218
1219void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated)
1220{
1221 if (name == NULL)
1222 return;
1223
1224 if (dso->short_name_allocated)
1225 free((char *)dso->short_name);
1226
1227 dso->short_name = name;
1228 dso->short_name_len = strlen(name);
1229 dso->short_name_allocated = name_allocated;
1230}
1231
1232int dso__name_len(const struct dso *dso)
1233{
1234 if (!dso)
1235 return strlen("[unknown]");
1236 if (verbose > 0)
1237 return dso->long_name_len;
1238
1239 return dso->short_name_len;
1240}
1241
1242bool dso__loaded(const struct dso *dso)
1243{
1244 return dso->loaded;
1245}
1246
1247bool dso__sorted_by_name(const struct dso *dso)
1248{
1249 return dso->sorted_by_name;
1250}
1251
1252void dso__set_sorted_by_name(struct dso *dso)
1253{
1254 dso->sorted_by_name = true;
1255}
1256
1257struct dso *dso__new_id(const char *name, struct dso_id *id)
1258{
1259 struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
1260
1261 if (dso != NULL) {
1262 strcpy(dso->name, name);
1263 if (id)
1264 dso->id = *id;
1265 dso__set_long_name_id(dso, dso->name, id, false);
1266 dso__set_short_name(dso, dso->name, false);
1267 dso->symbols = dso->symbol_names = RB_ROOT_CACHED;
1268 dso->data.cache = RB_ROOT;
1269 dso->inlined_nodes = RB_ROOT_CACHED;
1270 dso->srclines = RB_ROOT_CACHED;
1271 dso->data.fd = -1;
1272 dso->data.status = DSO_DATA_STATUS_UNKNOWN;
1273 dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
1274 dso->binary_type = DSO_BINARY_TYPE__NOT_FOUND;
1275 dso->is_64_bit = (sizeof(void *) == 8);
1276 dso->loaded = 0;
1277 dso->rel = 0;
1278 dso->sorted_by_name = 0;
1279 dso->has_build_id = 0;
1280 dso->has_srcline = 1;
1281 dso->a2l_fails = 1;
1282 dso->kernel = DSO_SPACE__USER;
1283 dso->needs_swap = DSO_SWAP__UNSET;
1284 dso->comp = COMP_ID__NONE;
1285 RB_CLEAR_NODE(&dso->rb_node);
1286 dso->root = NULL;
1287 INIT_LIST_HEAD(&dso->node);
1288 INIT_LIST_HEAD(&dso->data.open_entry);
1289 pthread_mutex_init(&dso->lock, NULL);
1290 refcount_set(&dso->refcnt, 1);
1291 }
1292
1293 return dso;
1294}
1295
1296struct dso *dso__new(const char *name)
1297{
1298 return dso__new_id(name, NULL);
1299}
1300
1301void dso__delete(struct dso *dso)
1302{
1303 if (!RB_EMPTY_NODE(&dso->rb_node))
1304 pr_err("DSO %s is still in rbtree when being deleted!\n",
1305 dso->long_name);
1306
1307
1308 inlines__tree_delete(&dso->inlined_nodes);
1309 srcline__tree_delete(&dso->srclines);
1310 symbols__delete(&dso->symbols);
1311
1312 if (dso->short_name_allocated) {
1313 zfree((char **)&dso->short_name);
1314 dso->short_name_allocated = false;
1315 }
1316
1317 if (dso->long_name_allocated) {
1318 zfree((char **)&dso->long_name);
1319 dso->long_name_allocated = false;
1320 }
1321
1322 dso__data_close(dso);
1323 auxtrace_cache__free(dso->auxtrace_cache);
1324 dso_cache__free(dso);
1325 dso__free_a2l(dso);
1326 zfree(&dso->symsrc_filename);
1327 nsinfo__zput(dso->nsinfo);
1328 pthread_mutex_destroy(&dso->lock);
1329 free(dso);
1330}
1331
1332struct dso *dso__get(struct dso *dso)
1333{
1334 if (dso)
1335 refcount_inc(&dso->refcnt);
1336 return dso;
1337}
1338
1339void dso__put(struct dso *dso)
1340{
1341 if (dso && refcount_dec_and_test(&dso->refcnt))
1342 dso__delete(dso);
1343}
1344
1345void dso__set_build_id(struct dso *dso, struct build_id *bid)
1346{
1347 dso->bid = *bid;
1348 dso->has_build_id = 1;
1349}
1350
1351bool dso__build_id_equal(const struct dso *dso, struct build_id *bid)
1352{
1353 if (dso->bid.size > bid->size && dso->bid.size == BUILD_ID_SIZE) {
1354
1355
1356
1357
1358 return !memcmp(dso->bid.data, bid->data, bid->size) &&
1359 !memchr_inv(&dso->bid.data[bid->size], 0,
1360 dso->bid.size - bid->size);
1361 }
1362
1363 return dso->bid.size == bid->size &&
1364 memcmp(dso->bid.data, bid->data, dso->bid.size) == 0;
1365}
1366
1367void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
1368{
1369 char path[PATH_MAX];
1370
1371 if (machine__is_default_guest(machine))
1372 return;
1373 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
1374 if (sysfs__read_build_id(path, &dso->bid) == 0)
1375 dso->has_build_id = true;
1376}
1377
1378int dso__kernel_module_get_build_id(struct dso *dso,
1379 const char *root_dir)
1380{
1381 char filename[PATH_MAX];
1382
1383
1384
1385
1386 const char *name = dso->short_name + 1;
1387
1388 snprintf(filename, sizeof(filename),
1389 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1390 root_dir, (int)strlen(name) - 1, name);
1391
1392 if (sysfs__read_build_id(filename, &dso->bid) == 0)
1393 dso->has_build_id = true;
1394
1395 return 0;
1396}
1397
1398static size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
1399{
1400 char sbuild_id[SBUILD_ID_SIZE];
1401
1402 build_id__sprintf(&dso->bid, sbuild_id);
1403 return fprintf(fp, "%s", sbuild_id);
1404}
1405
1406size_t dso__fprintf(struct dso *dso, FILE *fp)
1407{
1408 struct rb_node *nd;
1409 size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
1410
1411 if (dso->short_name != dso->long_name)
1412 ret += fprintf(fp, "%s, ", dso->long_name);
1413 ret += fprintf(fp, "%sloaded, ", dso__loaded(dso) ? "" : "NOT ");
1414 ret += dso__fprintf_buildid(dso, fp);
1415 ret += fprintf(fp, ")\n");
1416 for (nd = rb_first_cached(&dso->symbols); nd; nd = rb_next(nd)) {
1417 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
1418 ret += symbol__fprintf(pos, fp);
1419 }
1420
1421 return ret;
1422}
1423
1424enum dso_type dso__type(struct dso *dso, struct machine *machine)
1425{
1426 int fd;
1427 enum dso_type type = DSO__TYPE_UNKNOWN;
1428
1429 fd = dso__data_get_fd(dso, machine);
1430 if (fd >= 0) {
1431 type = dso__type_fd(fd);
1432 dso__data_put_fd(dso);
1433 }
1434
1435 return type;
1436}
1437
1438int dso__strerror_load(struct dso *dso, char *buf, size_t buflen)
1439{
1440 int idx, errnum = dso->load_errno;
1441
1442
1443
1444 static const char *dso_load__error_str[] = {
1445 "Internal tools/perf/ library error",
1446 "Invalid ELF file",
1447 "Can not read build id",
1448 "Mismatching build id",
1449 "Decompression failure",
1450 };
1451
1452 BUG_ON(buflen == 0);
1453
1454 if (errnum >= 0) {
1455 const char *err = str_error_r(errnum, buf, buflen);
1456
1457 if (err != buf)
1458 scnprintf(buf, buflen, "%s", err);
1459
1460 return 0;
1461 }
1462
1463 if (errnum < __DSO_LOAD_ERRNO__START || errnum >= __DSO_LOAD_ERRNO__END)
1464 return -1;
1465
1466 idx = errnum - __DSO_LOAD_ERRNO__START;
1467 scnprintf(buf, buflen, "%s", dso_load__error_str[idx]);
1468 return 0;
1469}
1470