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Linux 5.1.15
[linux/fpc-iii.git] / tools / perf / util / probe-event.c
blob198e09ff611e48cecce9ae3795f0a7c8a63c2c27
1 /*
2 * probe-event.c : perf-probe definition to probe_events format converter
3 *
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 */
21
22 #include <inttypes.h>
23 #include <sys/utsname.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <fcntl.h>
27 #include <errno.h>
28 #include <stdio.h>
29 #include <unistd.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <stdarg.h>
33 #include <limits.h>
34 #include <elf.h>
35
36 #include "util.h"
37 #include "event.h"
38 #include "namespaces.h"
39 #include "strlist.h"
40 #include "strfilter.h"
41 #include "debug.h"
42 #include "cache.h"
43 #include "color.h"
44 #include "map.h"
45 #include "map_groups.h"
46 #include "symbol.h"
47 #include "thread.h"
48 #include <api/fs/fs.h>
49 #include "trace-event.h" /* For __maybe_unused */
50 #include "probe-event.h"
51 #include "probe-finder.h"
52 #include "probe-file.h"
53 #include "session.h"
54 #include "string2.h"
55
56 #include "sane_ctype.h"
57
58 #define PERFPROBE_GROUP "probe"
59
60 bool probe_event_dry_run; /* Dry run flag */
61 struct probe_conf probe_conf;
62
63 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
64
65 int e_snprintf(char *str, size_t size, const char *format, ...)
66 {
67 int ret;
68 va_list ap;
69 va_start(ap, format);
70 ret = vsnprintf(str, size, format, ap);
71 va_end(ap);
72 if (ret >= (int)size)
73 ret = -E2BIG;
74 return ret;
75 }
76
77 static struct machine *host_machine;
78
79 /* Initialize symbol maps and path of vmlinux/modules */
80 int init_probe_symbol_maps(bool user_only)
81 {
82 int ret;
83
84 symbol_conf.sort_by_name = true;
85 symbol_conf.allow_aliases = true;
86 ret = symbol__init(NULL);
87 if (ret < 0) {
88 pr_debug("Failed to init symbol map.\n");
89 goto out;
90 }
91
92 if (host_machine || user_only) /* already initialized */
93 return 0;
94
95 if (symbol_conf.vmlinux_name)
96 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
97
98 host_machine = machine__new_host();
99 if (!host_machine) {
100 pr_debug("machine__new_host() failed.\n");
101 symbol__exit();
102 ret = -1;
103 }
104 out:
105 if (ret < 0)
106 pr_warning("Failed to init vmlinux path.\n");
107 return ret;
108 }
109
110 void exit_probe_symbol_maps(void)
111 {
112 machine__delete(host_machine);
113 host_machine = NULL;
114 symbol__exit();
115 }
116
117 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
118 {
119 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
120 struct kmap *kmap;
121 struct map *map = machine__kernel_map(host_machine);
122
123 if (map__load(map) < 0)
124 return NULL;
125
126 kmap = map__kmap(map);
127 if (!kmap)
128 return NULL;
129 return kmap->ref_reloc_sym;
130 }
131
132 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
133 bool reloc, bool reladdr)
134 {
135 struct ref_reloc_sym *reloc_sym;
136 struct symbol *sym;
137 struct map *map;
138
139 /* ref_reloc_sym is just a label. Need a special fix*/
140 reloc_sym = kernel_get_ref_reloc_sym();
141 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
142 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
143 else {
144 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
145 if (!sym)
146 return -ENOENT;
147 *addr = map->unmap_ip(map, sym->start) -
148 ((reloc) ? 0 : map->reloc) -
149 ((reladdr) ? map->start : 0);
150 }
151 return 0;
152 }
153
154 static struct map *kernel_get_module_map(const char *module)
155 {
156 struct maps *maps = machine__kernel_maps(host_machine);
157 struct map *pos;
158
159 /* A file path -- this is an offline module */
160 if (module && strchr(module, '/'))
161 return dso__new_map(module);
162
163 if (!module) {
164 pos = machine__kernel_map(host_machine);
165 return map__get(pos);
166 }
167
168 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
169 /* short_name is "[module]" */
170 if (strncmp(pos->dso->short_name + 1, module,
171 pos->dso->short_name_len - 2) == 0 &&
172 module[pos->dso->short_name_len - 2] == '\0') {
173 return map__get(pos);
174 }
175 }
176 return NULL;
177 }
178
179 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
180 {
181 /* Init maps of given executable or kernel */
182 if (user) {
183 struct map *map;
184
185 map = dso__new_map(target);
186 if (map && map->dso)
187 map->dso->nsinfo = nsinfo__get(nsi);
188 return map;
189 } else {
190 return kernel_get_module_map(target);
191 }
192 }
193
194 static int convert_exec_to_group(const char *exec, char **result)
195 {
196 char *ptr1, *ptr2, *exec_copy;
197 char buf[64];
198 int ret;
199
200 exec_copy = strdup(exec);
201 if (!exec_copy)
202 return -ENOMEM;
203
204 ptr1 = basename(exec_copy);
205 if (!ptr1) {
206 ret = -EINVAL;
207 goto out;
208 }
209
210 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
211 if (!isalnum(*ptr2) && *ptr2 != '_') {
212 *ptr2 = '\0';
213 break;
214 }
215 }
216
217 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
218 if (ret < 0)
219 goto out;
220
221 *result = strdup(buf);
222 ret = *result ? 0 : -ENOMEM;
223
224 out:
225 free(exec_copy);
226 return ret;
227 }
228
229 static void clear_perf_probe_point(struct perf_probe_point *pp)
230 {
231 free(pp->file);
232 free(pp->function);
233 free(pp->lazy_line);
234 }
235
236 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
237 {
238 int i;
239
240 for (i = 0; i < ntevs; i++)
241 clear_probe_trace_event(tevs + i);
242 }
243
244 static bool kprobe_blacklist__listed(unsigned long address);
245 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
246 {
247 u64 etext_addr = 0;
248 int ret;
249
250 /* Get the address of _etext for checking non-probable text symbol */
251 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
252 false, false);
253
254 if (ret == 0 && etext_addr < address)
255 pr_warning("%s is out of .text, skip it.\n", symbol);
256 else if (kprobe_blacklist__listed(address))
257 pr_warning("%s is blacklisted function, skip it.\n", symbol);
258 else
259 return false;
260
261 return true;
262 }
263
264 /*
265 * @module can be module name of module file path. In case of path,
266 * inspect elf and find out what is actual module name.
267 * Caller has to free mod_name after using it.
268 */
269 static char *find_module_name(const char *module)
270 {
271 int fd;
272 Elf *elf;
273 GElf_Ehdr ehdr;
274 GElf_Shdr shdr;
275 Elf_Data *data;
276 Elf_Scn *sec;
277 char *mod_name = NULL;
278 int name_offset;
279
280 fd = open(module, O_RDONLY);
281 if (fd < 0)
282 return NULL;
283
284 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
285 if (elf == NULL)
286 goto elf_err;
287
288 if (gelf_getehdr(elf, &ehdr) == NULL)
289 goto ret_err;
290
291 sec = elf_section_by_name(elf, &ehdr, &shdr,
292 ".gnu.linkonce.this_module", NULL);
293 if (!sec)
294 goto ret_err;
295
296 data = elf_getdata(sec, NULL);
297 if (!data || !data->d_buf)
298 goto ret_err;
299
300 /*
301 * NOTE:
302 * '.gnu.linkonce.this_module' section of kernel module elf directly
303 * maps to 'struct module' from linux/module.h. This section contains
304 * actual module name which will be used by kernel after loading it.
305 * But, we cannot use 'struct module' here since linux/module.h is not
306 * exposed to user-space. Offset of 'name' has remained same from long
307 * time, so hardcoding it here.
308 */
309 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
310 name_offset = 12;
311 else /* expect ELFCLASS64 by default */
312 name_offset = 24;
313
314 mod_name = strdup((char *)data->d_buf + name_offset);
315
316 ret_err:
317 elf_end(elf);
318 elf_err:
319 close(fd);
320 return mod_name;
321 }
322
323 #ifdef HAVE_DWARF_SUPPORT
324
325 static int kernel_get_module_dso(const char *module, struct dso **pdso)
326 {
327 struct dso *dso;
328 struct map *map;
329 const char *vmlinux_name;
330 int ret = 0;
331
332 if (module) {
333 char module_name[128];
334
335 snprintf(module_name, sizeof(module_name), "[%s]", module);
336 map = map_groups__find_by_name(&host_machine->kmaps, module_name);
337 if (map) {
338 dso = map->dso;
339 goto found;
340 }
341 pr_debug("Failed to find module %s.\n", module);
342 return -ENOENT;
343 }
344
345 map = machine__kernel_map(host_machine);
346 dso = map->dso;
347
348 vmlinux_name = symbol_conf.vmlinux_name;
349 dso->load_errno = 0;
350 if (vmlinux_name)
351 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
352 else
353 ret = dso__load_vmlinux_path(dso, map);
354 found:
355 *pdso = dso;
356 return ret;
357 }
358
359 /*
360 * Some binaries like glibc have special symbols which are on the symbol
361 * table, but not in the debuginfo. If we can find the address of the
362 * symbol from map, we can translate the address back to the probe point.
363 */
364 static int find_alternative_probe_point(struct debuginfo *dinfo,
365 struct perf_probe_point *pp,
366 struct perf_probe_point *result,
367 const char *target, struct nsinfo *nsi,
368 bool uprobes)
369 {
370 struct map *map = NULL;
371 struct symbol *sym;
372 u64 address = 0;
373 int ret = -ENOENT;
374
375 /* This can work only for function-name based one */
376 if (!pp->function || pp->file)
377 return -ENOTSUP;
378
379 map = get_target_map(target, nsi, uprobes);
380 if (!map)
381 return -EINVAL;
382
383 /* Find the address of given function */
384 map__for_each_symbol_by_name(map, pp->function, sym) {
385 if (uprobes)
386 address = sym->start;
387 else
388 address = map->unmap_ip(map, sym->start) - map->reloc;
389 break;
390 }
391 if (!address) {
392 ret = -ENOENT;
393 goto out;
394 }
395 pr_debug("Symbol %s address found : %" PRIx64 "\n",
396 pp->function, address);
397
398 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
399 result);
400 if (ret <= 0)
401 ret = (!ret) ? -ENOENT : ret;
402 else {
403 result->offset += pp->offset;
404 result->line += pp->line;
405 result->retprobe = pp->retprobe;
406 ret = 0;
407 }
408
409 out:
410 map__put(map);
411 return ret;
412
413 }
414
415 static int get_alternative_probe_event(struct debuginfo *dinfo,
416 struct perf_probe_event *pev,
417 struct perf_probe_point *tmp)
418 {
419 int ret;
420
421 memcpy(tmp, &pev->point, sizeof(*tmp));
422 memset(&pev->point, 0, sizeof(pev->point));
423 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
424 pev->nsi, pev->uprobes);
425 if (ret < 0)
426 memcpy(&pev->point, tmp, sizeof(*tmp));
427
428 return ret;
429 }
430
431 static int get_alternative_line_range(struct debuginfo *dinfo,
432 struct line_range *lr,
433 const char *target, bool user)
434 {
435 struct perf_probe_point pp = { .function = lr->function,
436 .file = lr->file,
437 .line = lr->start };
438 struct perf_probe_point result;
439 int ret, len = 0;
440
441 memset(&result, 0, sizeof(result));
442
443 if (lr->end != INT_MAX)
444 len = lr->end - lr->start;
445 ret = find_alternative_probe_point(dinfo, &pp, &result,
446 target, NULL, user);
447 if (!ret) {
448 lr->function = result.function;
449 lr->file = result.file;
450 lr->start = result.line;
451 if (lr->end != INT_MAX)
452 lr->end = lr->start + len;
453 clear_perf_probe_point(&pp);
454 }
455 return ret;
456 }
457
458 /* Open new debuginfo of given module */
459 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
460 bool silent)
461 {
462 const char *path = module;
463 char reason[STRERR_BUFSIZE];
464 struct debuginfo *ret = NULL;
465 struct dso *dso = NULL;
466 struct nscookie nsc;
467 int err;
468
469 if (!module || !strchr(module, '/')) {
470 err = kernel_get_module_dso(module, &dso);
471 if (err < 0) {
472 if (!dso || dso->load_errno == 0) {
473 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
474 strcpy(reason, "(unknown)");
475 } else
476 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
477 if (!silent) {
478 if (module)
479 pr_err("Module %s is not loaded, please specify its full path name.\n", module);
480 else
481 pr_err("Failed to find the path for the kernel: %s\n", reason);
482 }
483 return NULL;
484 }
485 path = dso->long_name;
486 }
487 nsinfo__mountns_enter(nsi, &nsc);
488 ret = debuginfo__new(path);
489 if (!ret && !silent) {
490 pr_warning("The %s file has no debug information.\n", path);
491 if (!module || !strtailcmp(path, ".ko"))
492 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
493 else
494 pr_warning("Rebuild with -g, ");
495 pr_warning("or install an appropriate debuginfo package.\n");
496 }
497 nsinfo__mountns_exit(&nsc);
498 return ret;
499 }
500
501 /* For caching the last debuginfo */
502 static struct debuginfo *debuginfo_cache;
503 static char *debuginfo_cache_path;
504
505 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
506 {
507 const char *path = module;
508
509 /* If the module is NULL, it should be the kernel. */
510 if (!module)
511 path = "kernel";
512
513 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
514 goto out;
515
516 /* Copy module path */
517 free(debuginfo_cache_path);
518 debuginfo_cache_path = strdup(path);
519 if (!debuginfo_cache_path) {
520 debuginfo__delete(debuginfo_cache);
521 debuginfo_cache = NULL;
522 goto out;
523 }
524
525 debuginfo_cache = open_debuginfo(module, NULL, silent);
526 if (!debuginfo_cache)
527 zfree(&debuginfo_cache_path);
528 out:
529 return debuginfo_cache;
530 }
531
532 static void debuginfo_cache__exit(void)
533 {
534 debuginfo__delete(debuginfo_cache);
535 debuginfo_cache = NULL;
536 zfree(&debuginfo_cache_path);
537 }
538
539
540 static int get_text_start_address(const char *exec, unsigned long *address,
541 struct nsinfo *nsi)
542 {
543 Elf *elf;
544 GElf_Ehdr ehdr;
545 GElf_Shdr shdr;
546 int fd, ret = -ENOENT;
547 struct nscookie nsc;
548
549 nsinfo__mountns_enter(nsi, &nsc);
550 fd = open(exec, O_RDONLY);
551 nsinfo__mountns_exit(&nsc);
552 if (fd < 0)
553 return -errno;
554
555 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
556 if (elf == NULL) {
557 ret = -EINVAL;
558 goto out_close;
559 }
560
561 if (gelf_getehdr(elf, &ehdr) == NULL)
562 goto out;
563
564 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
565 goto out;
566
567 *address = shdr.sh_addr - shdr.sh_offset;
568 ret = 0;
569 out:
570 elf_end(elf);
571 out_close:
572 close(fd);
573
574 return ret;
575 }
576
577 /*
578 * Convert trace point to probe point with debuginfo
579 */
580 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
581 struct perf_probe_point *pp,
582 bool is_kprobe)
583 {
584 struct debuginfo *dinfo = NULL;
585 unsigned long stext = 0;
586 u64 addr = tp->address;
587 int ret = -ENOENT;
588
589 /* convert the address to dwarf address */
590 if (!is_kprobe) {
591 if (!addr) {
592 ret = -EINVAL;
593 goto error;
594 }
595 ret = get_text_start_address(tp->module, &stext, NULL);
596 if (ret < 0)
597 goto error;
598 addr += stext;
599 } else if (tp->symbol) {
600 /* If the module is given, this returns relative address */
601 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
602 false, !!tp->module);
603 if (ret != 0)
604 goto error;
605 addr += tp->offset;
606 }
607
608 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
609 tp->module ? : "kernel");
610
611 dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
612 if (dinfo)
613 ret = debuginfo__find_probe_point(dinfo,
614 (unsigned long)addr, pp);
615 else
616 ret = -ENOENT;
617
618 if (ret > 0) {
619 pp->retprobe = tp->retprobe;
620 return 0;
621 }
622 error:
623 pr_debug("Failed to find corresponding probes from debuginfo.\n");
624 return ret ? : -ENOENT;
625 }
626
627 /* Adjust symbol name and address */
628 static int post_process_probe_trace_point(struct probe_trace_point *tp,
629 struct map *map, unsigned long offs)
630 {
631 struct symbol *sym;
632 u64 addr = tp->address - offs;
633
634 sym = map__find_symbol(map, addr);
635 if (!sym)
636 return -ENOENT;
637
638 if (strcmp(sym->name, tp->symbol)) {
639 /* If we have no realname, use symbol for it */
640 if (!tp->realname)
641 tp->realname = tp->symbol;
642 else
643 free(tp->symbol);
644 tp->symbol = strdup(sym->name);
645 if (!tp->symbol)
646 return -ENOMEM;
647 }
648 tp->offset = addr - sym->start;
649 tp->address -= offs;
650
651 return 0;
652 }
653
654 /*
655 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
656 * and generate new symbols with suffixes such as .constprop.N or .isra.N
657 * etc. Since those symbols are not recorded in DWARF, we have to find
658 * correct generated symbols from offline ELF binary.
659 * For online kernel or uprobes we don't need this because those are
660 * rebased on _text, or already a section relative address.
661 */
662 static int
663 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
664 int ntevs, const char *pathname)
665 {
666 struct map *map;
667 unsigned long stext = 0;
668 int i, ret = 0;
669
670 /* Prepare a map for offline binary */
671 map = dso__new_map(pathname);
672 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
673 pr_warning("Failed to get ELF symbols for %s\n", pathname);
674 return -EINVAL;
675 }
676
677 for (i = 0; i < ntevs; i++) {
678 ret = post_process_probe_trace_point(&tevs[i].point,
679 map, stext);
680 if (ret < 0)
681 break;
682 }
683 map__put(map);
684
685 return ret;
686 }
687
688 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
689 int ntevs, const char *exec,
690 struct nsinfo *nsi)
691 {
692 int i, ret = 0;
693 unsigned long stext = 0;
694
695 if (!exec)
696 return 0;
697
698 ret = get_text_start_address(exec, &stext, nsi);
699 if (ret < 0)
700 return ret;
701
702 for (i = 0; i < ntevs && ret >= 0; i++) {
703 /* point.address is the address of point.symbol + point.offset */
704 tevs[i].point.address -= stext;
705 tevs[i].point.module = strdup(exec);
706 if (!tevs[i].point.module) {
707 ret = -ENOMEM;
708 break;
709 }
710 tevs[i].uprobes = true;
711 }
712
713 return ret;
714 }
715
716 static int
717 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
718 int ntevs, const char *module,
719 struct debuginfo *dinfo)
720 {
721 Dwarf_Addr text_offs = 0;
722 int i, ret = 0;
723 char *mod_name = NULL;
724 struct map *map;
725
726 if (!module)
727 return 0;
728
729 map = get_target_map(module, NULL, false);
730 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
731 pr_warning("Failed to get ELF symbols for %s\n", module);
732 return -EINVAL;
733 }
734
735 mod_name = find_module_name(module);
736 for (i = 0; i < ntevs; i++) {
737 ret = post_process_probe_trace_point(&tevs[i].point,
738 map, (unsigned long)text_offs);
739 if (ret < 0)
740 break;
741 tevs[i].point.module =
742 strdup(mod_name ? mod_name : module);
743 if (!tevs[i].point.module) {
744 ret = -ENOMEM;
745 break;
746 }
747 }
748
749 free(mod_name);
750 map__put(map);
751
752 return ret;
753 }
754
755 static int
756 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
757 int ntevs)
758 {
759 struct ref_reloc_sym *reloc_sym;
760 char *tmp;
761 int i, skipped = 0;
762
763 /* Skip post process if the target is an offline kernel */
764 if (symbol_conf.ignore_vmlinux_buildid)
765 return post_process_offline_probe_trace_events(tevs, ntevs,
766 symbol_conf.vmlinux_name);
767
768 reloc_sym = kernel_get_ref_reloc_sym();
769 if (!reloc_sym) {
770 pr_warning("Relocated base symbol is not found!\n");
771 return -EINVAL;
772 }
773
774 for (i = 0; i < ntevs; i++) {
775 if (!tevs[i].point.address)
776 continue;
777 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
778 continue;
779 /* If we found a wrong one, mark it by NULL symbol */
780 if (kprobe_warn_out_range(tevs[i].point.symbol,
781 tevs[i].point.address)) {
782 tmp = NULL;
783 skipped++;
784 } else {
785 tmp = strdup(reloc_sym->name);
786 if (!tmp)
787 return -ENOMEM;
788 }
789 /* If we have no realname, use symbol for it */
790 if (!tevs[i].point.realname)
791 tevs[i].point.realname = tevs[i].point.symbol;
792 else
793 free(tevs[i].point.symbol);
794 tevs[i].point.symbol = tmp;
795 tevs[i].point.offset = tevs[i].point.address -
796 reloc_sym->unrelocated_addr;
797 }
798 return skipped;
799 }
800
801 void __weak
802 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
803 int ntevs __maybe_unused)
804 {
805 }
806
807 /* Post processing the probe events */
808 static int post_process_probe_trace_events(struct perf_probe_event *pev,
809 struct probe_trace_event *tevs,
810 int ntevs, const char *module,
811 bool uprobe, struct debuginfo *dinfo)
812 {
813 int ret;
814
815 if (uprobe)
816 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
817 pev->nsi);
818 else if (module)
819 /* Currently ref_reloc_sym based probe is not for drivers */
820 ret = post_process_module_probe_trace_events(tevs, ntevs,
821 module, dinfo);
822 else
823 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
824
825 if (ret >= 0)
826 arch__post_process_probe_trace_events(pev, ntevs);
827
828 return ret;
829 }
830
831 /* Try to find perf_probe_event with debuginfo */
832 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
833 struct probe_trace_event **tevs)
834 {
835 bool need_dwarf = perf_probe_event_need_dwarf(pev);
836 struct perf_probe_point tmp;
837 struct debuginfo *dinfo;
838 int ntevs, ret = 0;
839
840 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
841 if (!dinfo) {
842 if (need_dwarf)
843 return -ENOENT;
844 pr_debug("Could not open debuginfo. Try to use symbols.\n");
845 return 0;
846 }
847
848 pr_debug("Try to find probe point from debuginfo.\n");
849 /* Searching trace events corresponding to a probe event */
850 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
851
852 if (ntevs == 0) { /* Not found, retry with an alternative */
853 ret = get_alternative_probe_event(dinfo, pev, &tmp);
854 if (!ret) {
855 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
856 /*
857 * Write back to the original probe_event for
858 * setting appropriate (user given) event name
859 */
860 clear_perf_probe_point(&pev->point);
861 memcpy(&pev->point, &tmp, sizeof(tmp));
862 }
863 }
864
865 if (ntevs > 0) { /* Succeeded to find trace events */
866 pr_debug("Found %d probe_trace_events.\n", ntevs);
867 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
868 pev->target, pev->uprobes, dinfo);
869 if (ret < 0 || ret == ntevs) {
870 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
871 clear_probe_trace_events(*tevs, ntevs);
872 zfree(tevs);
873 ntevs = 0;
874 }
875 }
876
877 debuginfo__delete(dinfo);
878
879 if (ntevs == 0) { /* No error but failed to find probe point. */
880 pr_warning("Probe point '%s' not found.\n",
881 synthesize_perf_probe_point(&pev->point));
882 return -ENOENT;
883 } else if (ntevs < 0) {
884 /* Error path : ntevs < 0 */
885 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
886 if (ntevs == -EBADF)
887 pr_warning("Warning: No dwarf info found in the vmlinux - "
888 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
889 if (!need_dwarf) {
890 pr_debug("Trying to use symbols.\n");
891 return 0;
892 }
893 }
894 return ntevs;
895 }
896
897 #define LINEBUF_SIZE 256
898 #define NR_ADDITIONAL_LINES 2
899
900 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
901 {
902 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
903 const char *color = show_num ? "" : PERF_COLOR_BLUE;
904 const char *prefix = NULL;
905
906 do {
907 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
908 goto error;
909 if (skip)
910 continue;
911 if (!prefix) {
912 prefix = show_num ? "%7d " : " ";
913 color_fprintf(stdout, color, prefix, l);
914 }
915 color_fprintf(stdout, color, "%s", buf);
916
917 } while (strchr(buf, '\n') == NULL);
918
919 return 1;
920 error:
921 if (ferror(fp)) {
922 pr_warning("File read error: %s\n",
923 str_error_r(errno, sbuf, sizeof(sbuf)));
924 return -1;
925 }
926 return 0;
927 }
928
929 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
930 {
931 int rv = __show_one_line(fp, l, skip, show_num);
932 if (rv == 0) {
933 pr_warning("Source file is shorter than expected.\n");
934 rv = -1;
935 }
936 return rv;
937 }
938
939 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
940 #define show_one_line(f,l) _show_one_line(f,l,false,false)
941 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
942 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
943
944 /*
945 * Show line-range always requires debuginfo to find source file and
946 * line number.
947 */
948 static int __show_line_range(struct line_range *lr, const char *module,
949 bool user)
950 {
951 int l = 1;
952 struct int_node *ln;
953 struct debuginfo *dinfo;
954 FILE *fp;
955 int ret;
956 char *tmp;
957 char sbuf[STRERR_BUFSIZE];
958
959 /* Search a line range */
960 dinfo = open_debuginfo(module, NULL, false);
961 if (!dinfo)
962 return -ENOENT;
963
964 ret = debuginfo__find_line_range(dinfo, lr);
965 if (!ret) { /* Not found, retry with an alternative */
966 ret = get_alternative_line_range(dinfo, lr, module, user);
967 if (!ret)
968 ret = debuginfo__find_line_range(dinfo, lr);
969 }
970 debuginfo__delete(dinfo);
971 if (ret == 0 || ret == -ENOENT) {
972 pr_warning("Specified source line is not found.\n");
973 return -ENOENT;
974 } else if (ret < 0) {
975 pr_warning("Debuginfo analysis failed.\n");
976 return ret;
977 }
978
979 /* Convert source file path */
980 tmp = lr->path;
981 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
982
983 /* Free old path when new path is assigned */
984 if (tmp != lr->path)
985 free(tmp);
986
987 if (ret < 0) {
988 pr_warning("Failed to find source file path.\n");
989 return ret;
990 }
991
992 setup_pager();
993
994 if (lr->function)
995 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
996 lr->start - lr->offset);
997 else
998 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
999
1000 fp = fopen(lr->path, "r");
1001 if (fp == NULL) {
1002 pr_warning("Failed to open %s: %s\n", lr->path,
1003 str_error_r(errno, sbuf, sizeof(sbuf)));
1004 return -errno;
1005 }
1006 /* Skip to starting line number */
1007 while (l < lr->start) {
1008 ret = skip_one_line(fp, l++);
1009 if (ret < 0)
1010 goto end;
1011 }
1012
1013 intlist__for_each_entry(ln, lr->line_list) {
1014 for (; ln->i > l; l++) {
1015 ret = show_one_line(fp, l - lr->offset);
1016 if (ret < 0)
1017 goto end;
1018 }
1019 ret = show_one_line_with_num(fp, l++ - lr->offset);
1020 if (ret < 0)
1021 goto end;
1022 }
1023
1024 if (lr->end == INT_MAX)
1025 lr->end = l + NR_ADDITIONAL_LINES;
1026 while (l <= lr->end) {
1027 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1028 if (ret <= 0)
1029 break;
1030 }
1031 end:
1032 fclose(fp);
1033 return ret;
1034 }
1035
1036 int show_line_range(struct line_range *lr, const char *module,
1037 struct nsinfo *nsi, bool user)
1038 {
1039 int ret;
1040 struct nscookie nsc;
1041
1042 ret = init_probe_symbol_maps(user);
1043 if (ret < 0)
1044 return ret;
1045 nsinfo__mountns_enter(nsi, &nsc);
1046 ret = __show_line_range(lr, module, user);
1047 nsinfo__mountns_exit(&nsc);
1048 exit_probe_symbol_maps();
1049
1050 return ret;
1051 }
1052
1053 static int show_available_vars_at(struct debuginfo *dinfo,
1054 struct perf_probe_event *pev,
1055 struct strfilter *_filter)
1056 {
1057 char *buf;
1058 int ret, i, nvars;
1059 struct str_node *node;
1060 struct variable_list *vls = NULL, *vl;
1061 struct perf_probe_point tmp;
1062 const char *var;
1063
1064 buf = synthesize_perf_probe_point(&pev->point);
1065 if (!buf)
1066 return -EINVAL;
1067 pr_debug("Searching variables at %s\n", buf);
1068
1069 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1070 if (!ret) { /* Not found, retry with an alternative */
1071 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1072 if (!ret) {
1073 ret = debuginfo__find_available_vars_at(dinfo, pev,
1074 &vls);
1075 /* Release the old probe_point */
1076 clear_perf_probe_point(&tmp);
1077 }
1078 }
1079 if (ret <= 0) {
1080 if (ret == 0 || ret == -ENOENT) {
1081 pr_err("Failed to find the address of %s\n", buf);
1082 ret = -ENOENT;
1083 } else
1084 pr_warning("Debuginfo analysis failed.\n");
1085 goto end;
1086 }
1087
1088 /* Some variables are found */
1089 fprintf(stdout, "Available variables at %s\n", buf);
1090 for (i = 0; i < ret; i++) {
1091 vl = &vls[i];
1092 /*
1093 * A probe point might be converted to
1094 * several trace points.
1095 */
1096 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1097 vl->point.offset);
1098 zfree(&vl->point.symbol);
1099 nvars = 0;
1100 if (vl->vars) {
1101 strlist__for_each_entry(node, vl->vars) {
1102 var = strchr(node->s, '\t') + 1;
1103 if (strfilter__compare(_filter, var)) {
1104 fprintf(stdout, "\t\t%s\n", node->s);
1105 nvars++;
1106 }
1107 }
1108 strlist__delete(vl->vars);
1109 }
1110 if (nvars == 0)
1111 fprintf(stdout, "\t\t(No matched variables)\n");
1112 }
1113 free(vls);
1114 end:
1115 free(buf);
1116 return ret;
1117 }
1118
1119 /* Show available variables on given probe point */
1120 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1121 struct strfilter *_filter)
1122 {
1123 int i, ret = 0;
1124 struct debuginfo *dinfo;
1125
1126 ret = init_probe_symbol_maps(pevs->uprobes);
1127 if (ret < 0)
1128 return ret;
1129
1130 dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1131 if (!dinfo) {
1132 ret = -ENOENT;
1133 goto out;
1134 }
1135
1136 setup_pager();
1137
1138 for (i = 0; i < npevs && ret >= 0; i++)
1139 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1140
1141 debuginfo__delete(dinfo);
1142 out:
1143 exit_probe_symbol_maps();
1144 return ret;
1145 }
1146
1147 #else /* !HAVE_DWARF_SUPPORT */
1148
1149 static void debuginfo_cache__exit(void)
1150 {
1151 }
1152
1153 static int
1154 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1155 struct perf_probe_point *pp __maybe_unused,
1156 bool is_kprobe __maybe_unused)
1157 {
1158 return -ENOSYS;
1159 }
1160
1161 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1162 struct probe_trace_event **tevs __maybe_unused)
1163 {
1164 if (perf_probe_event_need_dwarf(pev)) {
1165 pr_warning("Debuginfo-analysis is not supported.\n");
1166 return -ENOSYS;
1167 }
1168
1169 return 0;
1170 }
1171
1172 int show_line_range(struct line_range *lr __maybe_unused,
1173 const char *module __maybe_unused,
1174 struct nsinfo *nsi __maybe_unused,
1175 bool user __maybe_unused)
1176 {
1177 pr_warning("Debuginfo-analysis is not supported.\n");
1178 return -ENOSYS;
1179 }
1180
1181 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1182 int npevs __maybe_unused,
1183 struct strfilter *filter __maybe_unused)
1184 {
1185 pr_warning("Debuginfo-analysis is not supported.\n");
1186 return -ENOSYS;
1187 }
1188 #endif
1189
1190 void line_range__clear(struct line_range *lr)
1191 {
1192 free(lr->function);
1193 free(lr->file);
1194 free(lr->path);
1195 free(lr->comp_dir);
1196 intlist__delete(lr->line_list);
1197 memset(lr, 0, sizeof(*lr));
1198 }
1199
1200 int line_range__init(struct line_range *lr)
1201 {
1202 memset(lr, 0, sizeof(*lr));
1203 lr->line_list = intlist__new(NULL);
1204 if (!lr->line_list)
1205 return -ENOMEM;
1206 else
1207 return 0;
1208 }
1209
1210 static int parse_line_num(char **ptr, int *val, const char *what)
1211 {
1212 const char *start = *ptr;
1213
1214 errno = 0;
1215 *val = strtol(*ptr, ptr, 0);
1216 if (errno || *ptr == start) {
1217 semantic_error("'%s' is not a valid number.\n", what);
1218 return -EINVAL;
1219 }
1220 return 0;
1221 }
1222
1223 /* Check the name is good for event, group or function */
1224 static bool is_c_func_name(const char *name)
1225 {
1226 if (!isalpha(*name) && *name != '_')
1227 return false;
1228 while (*++name != '\0') {
1229 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1230 return false;
1231 }
1232 return true;
1233 }
1234
1235 /*
1236 * Stuff 'lr' according to the line range described by 'arg'.
1237 * The line range syntax is described by:
1238 *
1239 * SRC[:SLN[+NUM|-ELN]]
1240 * FNC[@SRC][:SLN[+NUM|-ELN]]
1241 */
1242 int parse_line_range_desc(const char *arg, struct line_range *lr)
1243 {
1244 char *range, *file, *name = strdup(arg);
1245 int err;
1246
1247 if (!name)
1248 return -ENOMEM;
1249
1250 lr->start = 0;
1251 lr->end = INT_MAX;
1252
1253 range = strchr(name, ':');
1254 if (range) {
1255 *range++ = '\0';
1256
1257 err = parse_line_num(&range, &lr->start, "start line");
1258 if (err)
1259 goto err;
1260
1261 if (*range == '+' || *range == '-') {
1262 const char c = *range++;
1263
1264 err = parse_line_num(&range, &lr->end, "end line");
1265 if (err)
1266 goto err;
1267
1268 if (c == '+') {
1269 lr->end += lr->start;
1270 /*
1271 * Adjust the number of lines here.
1272 * If the number of lines == 1, the
1273 * the end of line should be equal to
1274 * the start of line.
1275 */
1276 lr->end--;
1277 }
1278 }
1279
1280 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1281
1282 err = -EINVAL;
1283 if (lr->start > lr->end) {
1284 semantic_error("Start line must be smaller"
1285 " than end line.\n");
1286 goto err;
1287 }
1288 if (*range != '\0') {
1289 semantic_error("Tailing with invalid str '%s'.\n", range);
1290 goto err;
1291 }
1292 }
1293
1294 file = strchr(name, '@');
1295 if (file) {
1296 *file = '\0';
1297 lr->file = strdup(++file);
1298 if (lr->file == NULL) {
1299 err = -ENOMEM;
1300 goto err;
1301 }
1302 lr->function = name;
1303 } else if (strchr(name, '/') || strchr(name, '.'))
1304 lr->file = name;
1305 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1306 lr->function = name;
1307 else { /* Invalid name */
1308 semantic_error("'%s' is not a valid function name.\n", name);
1309 err = -EINVAL;
1310 goto err;
1311 }
1312
1313 return 0;
1314 err:
1315 free(name);
1316 return err;
1317 }
1318
1319 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1320 {
1321 char *ptr;
1322
1323 ptr = strpbrk_esc(*arg, ":");
1324 if (ptr) {
1325 *ptr = '\0';
1326 if (!pev->sdt && !is_c_func_name(*arg))
1327 goto ng_name;
1328 pev->group = strdup_esc(*arg);
1329 if (!pev->group)
1330 return -ENOMEM;
1331 *arg = ptr + 1;
1332 } else
1333 pev->group = NULL;
1334
1335 pev->event = strdup_esc(*arg);
1336 if (pev->event == NULL)
1337 return -ENOMEM;
1338
1339 if (!pev->sdt && !is_c_func_name(pev->event)) {
1340 zfree(&pev->event);
1341 ng_name:
1342 zfree(&pev->group);
1343 semantic_error("%s is bad for event name -it must "
1344 "follow C symbol-naming rule.\n", *arg);
1345 return -EINVAL;
1346 }
1347 return 0;
1348 }
1349
1350 /* Parse probepoint definition. */
1351 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1352 {
1353 struct perf_probe_point *pp = &pev->point;
1354 char *ptr, *tmp;
1355 char c, nc = 0;
1356 bool file_spec = false;
1357 int ret;
1358
1359 /*
1360 * <Syntax>
1361 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1362 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1363 * perf probe %[GRP:]SDT_EVENT
1364 */
1365 if (!arg)
1366 return -EINVAL;
1367
1368 if (is_sdt_event(arg)) {
1369 pev->sdt = true;
1370 if (arg[0] == '%')
1371 arg++;
1372 }
1373
1374 ptr = strpbrk_esc(arg, ";=@+%");
1375 if (pev->sdt) {
1376 if (ptr) {
1377 if (*ptr != '@') {
1378 semantic_error("%s must be an SDT name.\n",
1379 arg);
1380 return -EINVAL;
1381 }
1382 /* This must be a target file name or build id */
1383 tmp = build_id_cache__complement(ptr + 1);
1384 if (tmp) {
1385 pev->target = build_id_cache__origname(tmp);
1386 free(tmp);
1387 } else
1388 pev->target = strdup_esc(ptr + 1);
1389 if (!pev->target)
1390 return -ENOMEM;
1391 *ptr = '\0';
1392 }
1393 ret = parse_perf_probe_event_name(&arg, pev);
1394 if (ret == 0) {
1395 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1396 ret = -errno;
1397 }
1398 return ret;
1399 }
1400
1401 if (ptr && *ptr == '=') { /* Event name */
1402 *ptr = '\0';
1403 tmp = ptr + 1;
1404 ret = parse_perf_probe_event_name(&arg, pev);
1405 if (ret < 0)
1406 return ret;
1407
1408 arg = tmp;
1409 }
1410
1411 /*
1412 * Check arg is function or file name and copy it.
1413 *
1414 * We consider arg to be a file spec if and only if it satisfies
1415 * all of the below criteria::
1416 * - it does not include any of "+@%",
1417 * - it includes one of ":;", and
1418 * - it has a period '.' in the name.
1419 *
1420 * Otherwise, we consider arg to be a function specification.
1421 */
1422 if (!strpbrk_esc(arg, "+@%")) {
1423 ptr = strpbrk_esc(arg, ";:");
1424 /* This is a file spec if it includes a '.' before ; or : */
1425 if (ptr && memchr(arg, '.', ptr - arg))
1426 file_spec = true;
1427 }
1428
1429 ptr = strpbrk_esc(arg, ";:+@%");
1430 if (ptr) {
1431 nc = *ptr;
1432 *ptr++ = '\0';
1433 }
1434
1435 if (arg[0] == '\0')
1436 tmp = NULL;
1437 else {
1438 tmp = strdup_esc(arg);
1439 if (tmp == NULL)
1440 return -ENOMEM;
1441 }
1442
1443 if (file_spec)
1444 pp->file = tmp;
1445 else {
1446 pp->function = tmp;
1447
1448 /*
1449 * Keep pp->function even if this is absolute address,
1450 * so it can mark whether abs_address is valid.
1451 * Which make 'perf probe lib.bin 0x0' possible.
1452 *
1453 * Note that checking length of tmp is not needed
1454 * because when we access tmp[1] we know tmp[0] is '0',
1455 * so tmp[1] should always valid (but could be '\0').
1456 */
1457 if (tmp && !strncmp(tmp, "0x", 2)) {
1458 pp->abs_address = strtoul(pp->function, &tmp, 0);
1459 if (*tmp != '\0') {
1460 semantic_error("Invalid absolute address.\n");
1461 return -EINVAL;
1462 }
1463 }
1464 }
1465
1466 /* Parse other options */
1467 while (ptr) {
1468 arg = ptr;
1469 c = nc;
1470 if (c == ';') { /* Lazy pattern must be the last part */
1471 pp->lazy_line = strdup(arg); /* let leave escapes */
1472 if (pp->lazy_line == NULL)
1473 return -ENOMEM;
1474 break;
1475 }
1476 ptr = strpbrk_esc(arg, ";:+@%");
1477 if (ptr) {
1478 nc = *ptr;
1479 *ptr++ = '\0';
1480 }
1481 switch (c) {
1482 case ':': /* Line number */
1483 pp->line = strtoul(arg, &tmp, 0);
1484 if (*tmp != '\0') {
1485 semantic_error("There is non-digit char"
1486 " in line number.\n");
1487 return -EINVAL;
1488 }
1489 break;
1490 case '+': /* Byte offset from a symbol */
1491 pp->offset = strtoul(arg, &tmp, 0);
1492 if (*tmp != '\0') {
1493 semantic_error("There is non-digit character"
1494 " in offset.\n");
1495 return -EINVAL;
1496 }
1497 break;
1498 case '@': /* File name */
1499 if (pp->file) {
1500 semantic_error("SRC@SRC is not allowed.\n");
1501 return -EINVAL;
1502 }
1503 pp->file = strdup_esc(arg);
1504 if (pp->file == NULL)
1505 return -ENOMEM;
1506 break;
1507 case '%': /* Probe places */
1508 if (strcmp(arg, "return") == 0) {
1509 pp->retprobe = 1;
1510 } else { /* Others not supported yet */
1511 semantic_error("%%%s is not supported.\n", arg);
1512 return -ENOTSUP;
1513 }
1514 break;
1515 default: /* Buggy case */
1516 pr_err("This program has a bug at %s:%d.\n",
1517 __FILE__, __LINE__);
1518 return -ENOTSUP;
1519 break;
1520 }
1521 }
1522
1523 /* Exclusion check */
1524 if (pp->lazy_line && pp->line) {
1525 semantic_error("Lazy pattern can't be used with"
1526 " line number.\n");
1527 return -EINVAL;
1528 }
1529
1530 if (pp->lazy_line && pp->offset) {
1531 semantic_error("Lazy pattern can't be used with offset.\n");
1532 return -EINVAL;
1533 }
1534
1535 if (pp->line && pp->offset) {
1536 semantic_error("Offset can't be used with line number.\n");
1537 return -EINVAL;
1538 }
1539
1540 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1541 semantic_error("File always requires line number or "
1542 "lazy pattern.\n");
1543 return -EINVAL;
1544 }
1545
1546 if (pp->offset && !pp->function) {
1547 semantic_error("Offset requires an entry function.\n");
1548 return -EINVAL;
1549 }
1550
1551 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1552 semantic_error("Offset/Line/Lazy pattern can't be used with "
1553 "return probe.\n");
1554 return -EINVAL;
1555 }
1556
1557 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1558 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1559 pp->lazy_line);
1560 return 0;
1561 }
1562
1563 /* Parse perf-probe event argument */
1564 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1565 {
1566 char *tmp, *goodname;
1567 struct perf_probe_arg_field **fieldp;
1568
1569 pr_debug("parsing arg: %s into ", str);
1570
1571 tmp = strchr(str, '=');
1572 if (tmp) {
1573 arg->name = strndup(str, tmp - str);
1574 if (arg->name == NULL)
1575 return -ENOMEM;
1576 pr_debug("name:%s ", arg->name);
1577 str = tmp + 1;
1578 }
1579
1580 tmp = strchr(str, ':');
1581 if (tmp) { /* Type setting */
1582 *tmp = '\0';
1583 arg->type = strdup(tmp + 1);
1584 if (arg->type == NULL)
1585 return -ENOMEM;
1586 pr_debug("type:%s ", arg->type);
1587 }
1588
1589 tmp = strpbrk(str, "-.[");
1590 if (!is_c_varname(str) || !tmp) {
1591 /* A variable, register, symbol or special value */
1592 arg->var = strdup(str);
1593 if (arg->var == NULL)
1594 return -ENOMEM;
1595 pr_debug("%s\n", arg->var);
1596 return 0;
1597 }
1598
1599 /* Structure fields or array element */
1600 arg->var = strndup(str, tmp - str);
1601 if (arg->var == NULL)
1602 return -ENOMEM;
1603 goodname = arg->var;
1604 pr_debug("%s, ", arg->var);
1605 fieldp = &arg->field;
1606
1607 do {
1608 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1609 if (*fieldp == NULL)
1610 return -ENOMEM;
1611 if (*tmp == '[') { /* Array */
1612 str = tmp;
1613 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1614 (*fieldp)->ref = true;
1615 if (*tmp != ']' || tmp == str + 1) {
1616 semantic_error("Array index must be a"
1617 " number.\n");
1618 return -EINVAL;
1619 }
1620 tmp++;
1621 if (*tmp == '\0')
1622 tmp = NULL;
1623 } else { /* Structure */
1624 if (*tmp == '.') {
1625 str = tmp + 1;
1626 (*fieldp)->ref = false;
1627 } else if (tmp[1] == '>') {
1628 str = tmp + 2;
1629 (*fieldp)->ref = true;
1630 } else {
1631 semantic_error("Argument parse error: %s\n",
1632 str);
1633 return -EINVAL;
1634 }
1635 tmp = strpbrk(str, "-.[");
1636 }
1637 if (tmp) {
1638 (*fieldp)->name = strndup(str, tmp - str);
1639 if ((*fieldp)->name == NULL)
1640 return -ENOMEM;
1641 if (*str != '[')
1642 goodname = (*fieldp)->name;
1643 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1644 fieldp = &(*fieldp)->next;
1645 }
1646 } while (tmp);
1647 (*fieldp)->name = strdup(str);
1648 if ((*fieldp)->name == NULL)
1649 return -ENOMEM;
1650 if (*str != '[')
1651 goodname = (*fieldp)->name;
1652 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1653
1654 /* If no name is specified, set the last field name (not array index)*/
1655 if (!arg->name) {
1656 arg->name = strdup(goodname);
1657 if (arg->name == NULL)
1658 return -ENOMEM;
1659 }
1660 return 0;
1661 }
1662
1663 /* Parse perf-probe event command */
1664 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1665 {
1666 char **argv;
1667 int argc, i, ret = 0;
1668
1669 argv = argv_split(cmd, &argc);
1670 if (!argv) {
1671 pr_debug("Failed to split arguments.\n");
1672 return -ENOMEM;
1673 }
1674 if (argc - 1 > MAX_PROBE_ARGS) {
1675 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1676 ret = -ERANGE;
1677 goto out;
1678 }
1679 /* Parse probe point */
1680 ret = parse_perf_probe_point(argv[0], pev);
1681 if (ret < 0)
1682 goto out;
1683
1684 /* Copy arguments and ensure return probe has no C argument */
1685 pev->nargs = argc - 1;
1686 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1687 if (pev->args == NULL) {
1688 ret = -ENOMEM;
1689 goto out;
1690 }
1691 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1692 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1693 if (ret >= 0 &&
1694 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1695 semantic_error("You can't specify local variable for"
1696 " kretprobe.\n");
1697 ret = -EINVAL;
1698 }
1699 }
1700 out:
1701 argv_free(argv);
1702
1703 return ret;
1704 }
1705
1706 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1707 bool perf_probe_with_var(struct perf_probe_event *pev)
1708 {
1709 int i = 0;
1710
1711 for (i = 0; i < pev->nargs; i++)
1712 if (is_c_varname(pev->args[i].var) ||
1713 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1714 !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1715 return true;
1716 return false;
1717 }
1718
1719 /* Return true if this perf_probe_event requires debuginfo */
1720 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1721 {
1722 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1723 return true;
1724
1725 if (perf_probe_with_var(pev))
1726 return true;
1727
1728 return false;
1729 }
1730
1731 /* Parse probe_events event into struct probe_point */
1732 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1733 {
1734 struct probe_trace_point *tp = &tev->point;
1735 char pr;
1736 char *p;
1737 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1738 int ret, i, argc;
1739 char **argv;
1740
1741 pr_debug("Parsing probe_events: %s\n", cmd);
1742 argv = argv_split(cmd, &argc);
1743 if (!argv) {
1744 pr_debug("Failed to split arguments.\n");
1745 return -ENOMEM;
1746 }
1747 if (argc < 2) {
1748 semantic_error("Too few probe arguments.\n");
1749 ret = -ERANGE;
1750 goto out;
1751 }
1752
1753 /* Scan event and group name. */
1754 argv0_str = strdup(argv[0]);
1755 if (argv0_str == NULL) {
1756 ret = -ENOMEM;
1757 goto out;
1758 }
1759 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1760 fmt2_str = strtok_r(NULL, "/", &fmt);
1761 fmt3_str = strtok_r(NULL, " \t", &fmt);
1762 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1763 || fmt3_str == NULL) {
1764 semantic_error("Failed to parse event name: %s\n", argv[0]);
1765 ret = -EINVAL;
1766 goto out;
1767 }
1768 pr = fmt1_str[0];
1769 tev->group = strdup(fmt2_str);
1770 tev->event = strdup(fmt3_str);
1771 if (tev->group == NULL || tev->event == NULL) {
1772 ret = -ENOMEM;
1773 goto out;
1774 }
1775 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1776
1777 tp->retprobe = (pr == 'r');
1778
1779 /* Scan module name(if there), function name and offset */
1780 p = strchr(argv[1], ':');
1781 if (p) {
1782 tp->module = strndup(argv[1], p - argv[1]);
1783 if (!tp->module) {
1784 ret = -ENOMEM;
1785 goto out;
1786 }
1787 tev->uprobes = (tp->module[0] == '/');
1788 p++;
1789 } else
1790 p = argv[1];
1791 fmt1_str = strtok_r(p, "+", &fmt);
1792 /* only the address started with 0x */
1793 if (fmt1_str[0] == '0') {
1794 /*
1795 * Fix a special case:
1796 * if address == 0, kernel reports something like:
1797 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1798 * Newer kernel may fix that, but we want to
1799 * support old kernel also.
1800 */
1801 if (strcmp(fmt1_str, "0x") == 0) {
1802 if (!argv[2] || strcmp(argv[2], "(null)")) {
1803 ret = -EINVAL;
1804 goto out;
1805 }
1806 tp->address = 0;
1807
1808 free(argv[2]);
1809 for (i = 2; argv[i + 1] != NULL; i++)
1810 argv[i] = argv[i + 1];
1811
1812 argv[i] = NULL;
1813 argc -= 1;
1814 } else
1815 tp->address = strtoul(fmt1_str, NULL, 0);
1816 } else {
1817 /* Only the symbol-based probe has offset */
1818 tp->symbol = strdup(fmt1_str);
1819 if (tp->symbol == NULL) {
1820 ret = -ENOMEM;
1821 goto out;
1822 }
1823 fmt2_str = strtok_r(NULL, "", &fmt);
1824 if (fmt2_str == NULL)
1825 tp->offset = 0;
1826 else
1827 tp->offset = strtoul(fmt2_str, NULL, 10);
1828 }
1829
1830 if (tev->uprobes) {
1831 fmt2_str = strchr(p, '(');
1832 if (fmt2_str)
1833 tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0);
1834 }
1835
1836 tev->nargs = argc - 2;
1837 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1838 if (tev->args == NULL) {
1839 ret = -ENOMEM;
1840 goto out;
1841 }
1842 for (i = 0; i < tev->nargs; i++) {
1843 p = strchr(argv[i + 2], '=');
1844 if (p) /* We don't need which register is assigned. */
1845 *p++ = '\0';
1846 else
1847 p = argv[i + 2];
1848 tev->args[i].name = strdup(argv[i + 2]);
1849 /* TODO: parse regs and offset */
1850 tev->args[i].value = strdup(p);
1851 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1852 ret = -ENOMEM;
1853 goto out;
1854 }
1855 }
1856 ret = 0;
1857 out:
1858 free(argv0_str);
1859 argv_free(argv);
1860 return ret;
1861 }
1862
1863 /* Compose only probe arg */
1864 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1865 {
1866 struct perf_probe_arg_field *field = pa->field;
1867 struct strbuf buf;
1868 char *ret = NULL;
1869 int err;
1870
1871 if (strbuf_init(&buf, 64) < 0)
1872 return NULL;
1873
1874 if (pa->name && pa->var)
1875 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1876 else
1877 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1878 if (err)
1879 goto out;
1880
1881 while (field) {
1882 if (field->name[0] == '[')
1883 err = strbuf_addstr(&buf, field->name);
1884 else
1885 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1886 field->name);
1887 field = field->next;
1888 if (err)
1889 goto out;
1890 }
1891
1892 if (pa->type)
1893 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1894 goto out;
1895
1896 ret = strbuf_detach(&buf, NULL);
1897 out:
1898 strbuf_release(&buf);
1899 return ret;
1900 }
1901
1902 /* Compose only probe point (not argument) */
1903 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1904 {
1905 struct strbuf buf;
1906 char *tmp, *ret = NULL;
1907 int len, err = 0;
1908
1909 if (strbuf_init(&buf, 64) < 0)
1910 return NULL;
1911
1912 if (pp->function) {
1913 if (strbuf_addstr(&buf, pp->function) < 0)
1914 goto out;
1915 if (pp->offset)
1916 err = strbuf_addf(&buf, "+%lu", pp->offset);
1917 else if (pp->line)
1918 err = strbuf_addf(&buf, ":%d", pp->line);
1919 else if (pp->retprobe)
1920 err = strbuf_addstr(&buf, "%return");
1921 if (err)
1922 goto out;
1923 }
1924 if (pp->file) {
1925 tmp = pp->file;
1926 len = strlen(tmp);
1927 if (len > 30) {
1928 tmp = strchr(pp->file + len - 30, '/');
1929 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1930 }
1931 err = strbuf_addf(&buf, "@%s", tmp);
1932 if (!err && !pp->function && pp->line)
1933 err = strbuf_addf(&buf, ":%d", pp->line);
1934 }
1935 if (!err)
1936 ret = strbuf_detach(&buf, NULL);
1937 out:
1938 strbuf_release(&buf);
1939 return ret;
1940 }
1941
1942 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1943 {
1944 struct strbuf buf;
1945 char *tmp, *ret = NULL;
1946 int i;
1947
1948 if (strbuf_init(&buf, 64))
1949 return NULL;
1950 if (pev->event)
1951 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1952 pev->event) < 0)
1953 goto out;
1954
1955 tmp = synthesize_perf_probe_point(&pev->point);
1956 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1957 goto out;
1958 free(tmp);
1959
1960 for (i = 0; i < pev->nargs; i++) {
1961 tmp = synthesize_perf_probe_arg(pev->args + i);
1962 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1963 goto out;
1964 free(tmp);
1965 }
1966
1967 ret = strbuf_detach(&buf, NULL);
1968 out:
1969 strbuf_release(&buf);
1970 return ret;
1971 }
1972
1973 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1974 struct strbuf *buf, int depth)
1975 {
1976 int err;
1977 if (ref->next) {
1978 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1979 depth + 1);
1980 if (depth < 0)
1981 return depth;
1982 }
1983 err = strbuf_addf(buf, "%+ld(", ref->offset);
1984 return (err < 0) ? err : depth;
1985 }
1986
1987 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1988 struct strbuf *buf)
1989 {
1990 struct probe_trace_arg_ref *ref = arg->ref;
1991 int depth = 0, err;
1992
1993 /* Argument name or separator */
1994 if (arg->name)
1995 err = strbuf_addf(buf, " %s=", arg->name);
1996 else
1997 err = strbuf_addch(buf, ' ');
1998 if (err)
1999 return err;
2000
2001 /* Special case: @XXX */
2002 if (arg->value[0] == '@' && arg->ref)
2003 ref = ref->next;
2004
2005 /* Dereferencing arguments */
2006 if (ref) {
2007 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
2008 if (depth < 0)
2009 return depth;
2010 }
2011
2012 /* Print argument value */
2013 if (arg->value[0] == '@' && arg->ref)
2014 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2015 else
2016 err = strbuf_addstr(buf, arg->value);
2017
2018 /* Closing */
2019 while (!err && depth--)
2020 err = strbuf_addch(buf, ')');
2021
2022 /* Print argument type */
2023 if (!err && arg->type)
2024 err = strbuf_addf(buf, ":%s", arg->type);
2025
2026 return err;
2027 }
2028
2029 static int
2030 synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf)
2031 {
2032 struct probe_trace_point *tp = &tev->point;
2033 int err;
2034
2035 err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address);
2036
2037 if (err >= 0 && tp->ref_ctr_offset) {
2038 if (!uprobe_ref_ctr_is_supported())
2039 return -1;
2040 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
2041 }
2042 return err >= 0 ? 0 : -1;
2043 }
2044
2045 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2046 {
2047 struct probe_trace_point *tp = &tev->point;
2048 struct strbuf buf;
2049 char *ret = NULL;
2050 int i, err;
2051
2052 /* Uprobes must have tp->module */
2053 if (tev->uprobes && !tp->module)
2054 return NULL;
2055
2056 if (strbuf_init(&buf, 32) < 0)
2057 return NULL;
2058
2059 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2060 tev->group, tev->event) < 0)
2061 goto error;
2062 /*
2063 * If tp->address == 0, then this point must be a
2064 * absolute address uprobe.
2065 * try_to_find_absolute_address() should have made
2066 * tp->symbol to "0x0".
2067 */
2068 if (tev->uprobes && !tp->address) {
2069 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2070 goto error;
2071 }
2072
2073 /* Use the tp->address for uprobes */
2074 if (tev->uprobes) {
2075 err = synthesize_uprobe_trace_def(tev, &buf);
2076 } else if (!strncmp(tp->symbol, "0x", 2)) {
2077 /* Absolute address. See try_to_find_absolute_address() */
2078 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2079 tp->module ? ":" : "", tp->address);
2080 } else {
2081 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2082 tp->module ? ":" : "", tp->symbol, tp->offset);
2083 }
2084
2085 if (err)
2086 goto error;
2087
2088 for (i = 0; i < tev->nargs; i++)
2089 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
2090 goto error;
2091
2092 ret = strbuf_detach(&buf, NULL);
2093 error:
2094 strbuf_release(&buf);
2095 return ret;
2096 }
2097
2098 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2099 struct perf_probe_point *pp,
2100 bool is_kprobe)
2101 {
2102 struct symbol *sym = NULL;
2103 struct map *map = NULL;
2104 u64 addr = tp->address;
2105 int ret = -ENOENT;
2106
2107 if (!is_kprobe) {
2108 map = dso__new_map(tp->module);
2109 if (!map)
2110 goto out;
2111 sym = map__find_symbol(map, addr);
2112 } else {
2113 if (tp->symbol && !addr) {
2114 if (kernel_get_symbol_address_by_name(tp->symbol,
2115 &addr, true, false) < 0)
2116 goto out;
2117 }
2118 if (addr) {
2119 addr += tp->offset;
2120 sym = machine__find_kernel_symbol(host_machine, addr, &map);
2121 }
2122 }
2123
2124 if (!sym)
2125 goto out;
2126
2127 pp->retprobe = tp->retprobe;
2128 pp->offset = addr - map->unmap_ip(map, sym->start);
2129 pp->function = strdup(sym->name);
2130 ret = pp->function ? 0 : -ENOMEM;
2131
2132 out:
2133 if (map && !is_kprobe) {
2134 map__put(map);
2135 }
2136
2137 return ret;
2138 }
2139
2140 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2141 struct perf_probe_point *pp,
2142 bool is_kprobe)
2143 {
2144 char buf[128];
2145 int ret;
2146
2147 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2148 if (!ret)
2149 return 0;
2150 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2151 if (!ret)
2152 return 0;
2153
2154 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2155
2156 if (tp->symbol) {
2157 pp->function = strdup(tp->symbol);
2158 pp->offset = tp->offset;
2159 } else {
2160 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2161 if (ret < 0)
2162 return ret;
2163 pp->function = strdup(buf);
2164 pp->offset = 0;
2165 }
2166 if (pp->function == NULL)
2167 return -ENOMEM;
2168
2169 pp->retprobe = tp->retprobe;
2170
2171 return 0;
2172 }
2173
2174 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2175 struct perf_probe_event *pev, bool is_kprobe)
2176 {
2177 struct strbuf buf = STRBUF_INIT;
2178 int i, ret;
2179
2180 /* Convert event/group name */
2181 pev->event = strdup(tev->event);
2182 pev->group = strdup(tev->group);
2183 if (pev->event == NULL || pev->group == NULL)
2184 return -ENOMEM;
2185
2186 /* Convert trace_point to probe_point */
2187 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2188 if (ret < 0)
2189 return ret;
2190
2191 /* Convert trace_arg to probe_arg */
2192 pev->nargs = tev->nargs;
2193 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2194 if (pev->args == NULL)
2195 return -ENOMEM;
2196 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2197 if (tev->args[i].name)
2198 pev->args[i].name = strdup(tev->args[i].name);
2199 else {
2200 if ((ret = strbuf_init(&buf, 32)) < 0)
2201 goto error;
2202 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2203 pev->args[i].name = strbuf_detach(&buf, NULL);
2204 }
2205 if (pev->args[i].name == NULL && ret >= 0)
2206 ret = -ENOMEM;
2207 }
2208 error:
2209 if (ret < 0)
2210 clear_perf_probe_event(pev);
2211
2212 return ret;
2213 }
2214
2215 void clear_perf_probe_event(struct perf_probe_event *pev)
2216 {
2217 struct perf_probe_arg_field *field, *next;
2218 int i;
2219
2220 free(pev->event);
2221 free(pev->group);
2222 free(pev->target);
2223 clear_perf_probe_point(&pev->point);
2224
2225 for (i = 0; i < pev->nargs; i++) {
2226 free(pev->args[i].name);
2227 free(pev->args[i].var);
2228 free(pev->args[i].type);
2229 field = pev->args[i].field;
2230 while (field) {
2231 next = field->next;
2232 zfree(&field->name);
2233 free(field);
2234 field = next;
2235 }
2236 }
2237 free(pev->args);
2238 memset(pev, 0, sizeof(*pev));
2239 }
2240
2241 #define strdup_or_goto(str, label) \
2242 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2243
2244 static int perf_probe_point__copy(struct perf_probe_point *dst,
2245 struct perf_probe_point *src)
2246 {
2247 dst->file = strdup_or_goto(src->file, out_err);
2248 dst->function = strdup_or_goto(src->function, out_err);
2249 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2250 dst->line = src->line;
2251 dst->retprobe = src->retprobe;
2252 dst->offset = src->offset;
2253 return 0;
2254
2255 out_err:
2256 clear_perf_probe_point(dst);
2257 return -ENOMEM;
2258 }
2259
2260 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2261 struct perf_probe_arg *src)
2262 {
2263 struct perf_probe_arg_field *field, **ppfield;
2264
2265 dst->name = strdup_or_goto(src->name, out_err);
2266 dst->var = strdup_or_goto(src->var, out_err);
2267 dst->type = strdup_or_goto(src->type, out_err);
2268
2269 field = src->field;
2270 ppfield = &(dst->field);
2271 while (field) {
2272 *ppfield = zalloc(sizeof(*field));
2273 if (!*ppfield)
2274 goto out_err;
2275 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2276 (*ppfield)->index = field->index;
2277 (*ppfield)->ref = field->ref;
2278 field = field->next;
2279 ppfield = &((*ppfield)->next);
2280 }
2281 return 0;
2282 out_err:
2283 return -ENOMEM;
2284 }
2285
2286 int perf_probe_event__copy(struct perf_probe_event *dst,
2287 struct perf_probe_event *src)
2288 {
2289 int i;
2290
2291 dst->event = strdup_or_goto(src->event, out_err);
2292 dst->group = strdup_or_goto(src->group, out_err);
2293 dst->target = strdup_or_goto(src->target, out_err);
2294 dst->uprobes = src->uprobes;
2295
2296 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2297 goto out_err;
2298
2299 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2300 if (!dst->args)
2301 goto out_err;
2302 dst->nargs = src->nargs;
2303
2304 for (i = 0; i < src->nargs; i++)
2305 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2306 goto out_err;
2307 return 0;
2308
2309 out_err:
2310 clear_perf_probe_event(dst);
2311 return -ENOMEM;
2312 }
2313
2314 void clear_probe_trace_event(struct probe_trace_event *tev)
2315 {
2316 struct probe_trace_arg_ref *ref, *next;
2317 int i;
2318
2319 free(tev->event);
2320 free(tev->group);
2321 free(tev->point.symbol);
2322 free(tev->point.realname);
2323 free(tev->point.module);
2324 for (i = 0; i < tev->nargs; i++) {
2325 free(tev->args[i].name);
2326 free(tev->args[i].value);
2327 free(tev->args[i].type);
2328 ref = tev->args[i].ref;
2329 while (ref) {
2330 next = ref->next;
2331 free(ref);
2332 ref = next;
2333 }
2334 }
2335 free(tev->args);
2336 memset(tev, 0, sizeof(*tev));
2337 }
2338
2339 struct kprobe_blacklist_node {
2340 struct list_head list;
2341 unsigned long start;
2342 unsigned long end;
2343 char *symbol;
2344 };
2345
2346 static void kprobe_blacklist__delete(struct list_head *blacklist)
2347 {
2348 struct kprobe_blacklist_node *node;
2349
2350 while (!list_empty(blacklist)) {
2351 node = list_first_entry(blacklist,
2352 struct kprobe_blacklist_node, list);
2353 list_del(&node->list);
2354 free(node->symbol);
2355 free(node);
2356 }
2357 }
2358
2359 static int kprobe_blacklist__load(struct list_head *blacklist)
2360 {
2361 struct kprobe_blacklist_node *node;
2362 const char *__debugfs = debugfs__mountpoint();
2363 char buf[PATH_MAX], *p;
2364 FILE *fp;
2365 int ret;
2366
2367 if (__debugfs == NULL)
2368 return -ENOTSUP;
2369
2370 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2371 if (ret < 0)
2372 return ret;
2373
2374 fp = fopen(buf, "r");
2375 if (!fp)
2376 return -errno;
2377
2378 ret = 0;
2379 while (fgets(buf, PATH_MAX, fp)) {
2380 node = zalloc(sizeof(*node));
2381 if (!node) {
2382 ret = -ENOMEM;
2383 break;
2384 }
2385 INIT_LIST_HEAD(&node->list);
2386 list_add_tail(&node->list, blacklist);
2387 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2388 ret = -EINVAL;
2389 break;
2390 }
2391 p = strchr(buf, '\t');
2392 if (p) {
2393 p++;
2394 if (p[strlen(p) - 1] == '\n')
2395 p[strlen(p) - 1] = '\0';
2396 } else
2397 p = (char *)"unknown";
2398 node->symbol = strdup(p);
2399 if (!node->symbol) {
2400 ret = -ENOMEM;
2401 break;
2402 }
2403 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2404 node->start, node->end, node->symbol);
2405 ret++;
2406 }
2407 if (ret < 0)
2408 kprobe_blacklist__delete(blacklist);
2409 fclose(fp);
2410
2411 return ret;
2412 }
2413
2414 static struct kprobe_blacklist_node *
2415 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2416 unsigned long address)
2417 {
2418 struct kprobe_blacklist_node *node;
2419
2420 list_for_each_entry(node, blacklist, list) {
2421 if (node->start <= address && address < node->end)
2422 return node;
2423 }
2424
2425 return NULL;
2426 }
2427
2428 static LIST_HEAD(kprobe_blacklist);
2429
2430 static void kprobe_blacklist__init(void)
2431 {
2432 if (!list_empty(&kprobe_blacklist))
2433 return;
2434
2435 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2436 pr_debug("No kprobe blacklist support, ignored\n");
2437 }
2438
2439 static void kprobe_blacklist__release(void)
2440 {
2441 kprobe_blacklist__delete(&kprobe_blacklist);
2442 }
2443
2444 static bool kprobe_blacklist__listed(unsigned long address)
2445 {
2446 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2447 }
2448
2449 static int perf_probe_event__sprintf(const char *group, const char *event,
2450 struct perf_probe_event *pev,
2451 const char *module,
2452 struct strbuf *result)
2453 {
2454 int i, ret;
2455 char *buf;
2456
2457 if (asprintf(&buf, "%s:%s", group, event) < 0)
2458 return -errno;
2459 ret = strbuf_addf(result, " %-20s (on ", buf);
2460 free(buf);
2461 if (ret)
2462 return ret;
2463
2464 /* Synthesize only event probe point */
2465 buf = synthesize_perf_probe_point(&pev->point);
2466 if (!buf)
2467 return -ENOMEM;
2468 ret = strbuf_addstr(result, buf);
2469 free(buf);
2470
2471 if (!ret && module)
2472 ret = strbuf_addf(result, " in %s", module);
2473
2474 if (!ret && pev->nargs > 0) {
2475 ret = strbuf_add(result, " with", 5);
2476 for (i = 0; !ret && i < pev->nargs; i++) {
2477 buf = synthesize_perf_probe_arg(&pev->args[i]);
2478 if (!buf)
2479 return -ENOMEM;
2480 ret = strbuf_addf(result, " %s", buf);
2481 free(buf);
2482 }
2483 }
2484 if (!ret)
2485 ret = strbuf_addch(result, ')');
2486
2487 return ret;
2488 }
2489
2490 /* Show an event */
2491 int show_perf_probe_event(const char *group, const char *event,
2492 struct perf_probe_event *pev,
2493 const char *module, bool use_stdout)
2494 {
2495 struct strbuf buf = STRBUF_INIT;
2496 int ret;
2497
2498 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2499 if (ret >= 0) {
2500 if (use_stdout)
2501 printf("%s\n", buf.buf);
2502 else
2503 pr_info("%s\n", buf.buf);
2504 }
2505 strbuf_release(&buf);
2506
2507 return ret;
2508 }
2509
2510 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2511 struct strfilter *filter)
2512 {
2513 char tmp[128];
2514
2515 /* At first, check the event name itself */
2516 if (strfilter__compare(filter, tev->event))
2517 return true;
2518
2519 /* Next, check the combination of name and group */
2520 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2521 return false;
2522 return strfilter__compare(filter, tmp);
2523 }
2524
2525 static int __show_perf_probe_events(int fd, bool is_kprobe,
2526 struct strfilter *filter)
2527 {
2528 int ret = 0;
2529 struct probe_trace_event tev;
2530 struct perf_probe_event pev;
2531 struct strlist *rawlist;
2532 struct str_node *ent;
2533
2534 memset(&tev, 0, sizeof(tev));
2535 memset(&pev, 0, sizeof(pev));
2536
2537 rawlist = probe_file__get_rawlist(fd);
2538 if (!rawlist)
2539 return -ENOMEM;
2540
2541 strlist__for_each_entry(ent, rawlist) {
2542 ret = parse_probe_trace_command(ent->s, &tev);
2543 if (ret >= 0) {
2544 if (!filter_probe_trace_event(&tev, filter))
2545 goto next;
2546 ret = convert_to_perf_probe_event(&tev, &pev,
2547 is_kprobe);
2548 if (ret < 0)
2549 goto next;
2550 ret = show_perf_probe_event(pev.group, pev.event,
2551 &pev, tev.point.module,
2552 true);
2553 }
2554 next:
2555 clear_perf_probe_event(&pev);
2556 clear_probe_trace_event(&tev);
2557 if (ret < 0)
2558 break;
2559 }
2560 strlist__delete(rawlist);
2561 /* Cleanup cached debuginfo if needed */
2562 debuginfo_cache__exit();
2563
2564 return ret;
2565 }
2566
2567 /* List up current perf-probe events */
2568 int show_perf_probe_events(struct strfilter *filter)
2569 {
2570 int kp_fd, up_fd, ret;
2571
2572 setup_pager();
2573
2574 if (probe_conf.cache)
2575 return probe_cache__show_all_caches(filter);
2576
2577 ret = init_probe_symbol_maps(false);
2578 if (ret < 0)
2579 return ret;
2580
2581 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2582 if (ret < 0)
2583 return ret;
2584
2585 if (kp_fd >= 0)
2586 ret = __show_perf_probe_events(kp_fd, true, filter);
2587 if (up_fd >= 0 && ret >= 0)
2588 ret = __show_perf_probe_events(up_fd, false, filter);
2589 if (kp_fd > 0)
2590 close(kp_fd);
2591 if (up_fd > 0)
2592 close(up_fd);
2593 exit_probe_symbol_maps();
2594
2595 return ret;
2596 }
2597
2598 static int get_new_event_name(char *buf, size_t len, const char *base,
2599 struct strlist *namelist, bool ret_event,
2600 bool allow_suffix)
2601 {
2602 int i, ret;
2603 char *p, *nbase;
2604
2605 if (*base == '.')
2606 base++;
2607 nbase = strdup(base);
2608 if (!nbase)
2609 return -ENOMEM;
2610
2611 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2612 p = strpbrk(nbase, ".@");
2613 if (p && p != nbase)
2614 *p = '\0';
2615
2616 /* Try no suffix number */
2617 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2618 if (ret < 0) {
2619 pr_debug("snprintf() failed: %d\n", ret);
2620 goto out;
2621 }
2622 if (!strlist__has_entry(namelist, buf))
2623 goto out;
2624
2625 if (!allow_suffix) {
2626 pr_warning("Error: event \"%s\" already exists.\n"
2627 " Hint: Remove existing event by 'perf probe -d'\n"
2628 " or force duplicates by 'perf probe -f'\n"
2629 " or set 'force=yes' in BPF source.\n",
2630 buf);
2631 ret = -EEXIST;
2632 goto out;
2633 }
2634
2635 /* Try to add suffix */
2636 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2637 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2638 if (ret < 0) {
2639 pr_debug("snprintf() failed: %d\n", ret);
2640 goto out;
2641 }
2642 if (!strlist__has_entry(namelist, buf))
2643 break;
2644 }
2645 if (i == MAX_EVENT_INDEX) {
2646 pr_warning("Too many events are on the same function.\n");
2647 ret = -ERANGE;
2648 }
2649
2650 out:
2651 free(nbase);
2652
2653 /* Final validation */
2654 if (ret >= 0 && !is_c_func_name(buf)) {
2655 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2656 buf);
2657 ret = -EINVAL;
2658 }
2659
2660 return ret;
2661 }
2662
2663 /* Warn if the current kernel's uprobe implementation is old */
2664 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2665 {
2666 int i;
2667 char *buf = synthesize_probe_trace_command(tev);
2668 struct probe_trace_point *tp = &tev->point;
2669
2670 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) {
2671 pr_warning("A semaphore is associated with %s:%s and "
2672 "seems your kernel doesn't support it.\n",
2673 tev->group, tev->event);
2674 }
2675
2676 /* Old uprobe event doesn't support memory dereference */
2677 if (!tev->uprobes || tev->nargs == 0 || !buf)
2678 goto out;
2679
2680 for (i = 0; i < tev->nargs; i++)
2681 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2682 pr_warning("Please upgrade your kernel to at least "
2683 "3.14 to have access to feature %s\n",
2684 tev->args[i].value);
2685 break;
2686 }
2687 out:
2688 free(buf);
2689 }
2690
2691 /* Set new name from original perf_probe_event and namelist */
2692 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2693 struct perf_probe_event *pev,
2694 struct strlist *namelist,
2695 bool allow_suffix)
2696 {
2697 const char *event, *group;
2698 char buf[64];
2699 int ret;
2700
2701 /* If probe_event or trace_event already have the name, reuse it */
2702 if (pev->event && !pev->sdt)
2703 event = pev->event;
2704 else if (tev->event)
2705 event = tev->event;
2706 else {
2707 /* Or generate new one from probe point */
2708 if (pev->point.function &&
2709 (strncmp(pev->point.function, "0x", 2) != 0) &&
2710 !strisglob(pev->point.function))
2711 event = pev->point.function;
2712 else
2713 event = tev->point.realname;
2714 }
2715 if (pev->group && !pev->sdt)
2716 group = pev->group;
2717 else if (tev->group)
2718 group = tev->group;
2719 else
2720 group = PERFPROBE_GROUP;
2721
2722 /* Get an unused new event name */
2723 ret = get_new_event_name(buf, 64, event, namelist,
2724 tev->point.retprobe, allow_suffix);
2725 if (ret < 0)
2726 return ret;
2727
2728 event = buf;
2729
2730 tev->event = strdup(event);
2731 tev->group = strdup(group);
2732 if (tev->event == NULL || tev->group == NULL)
2733 return -ENOMEM;
2734
2735 /* Add added event name to namelist */
2736 strlist__add(namelist, event);
2737 return 0;
2738 }
2739
2740 static int __open_probe_file_and_namelist(bool uprobe,
2741 struct strlist **namelist)
2742 {
2743 int fd;
2744
2745 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2746 if (fd < 0)
2747 return fd;
2748
2749 /* Get current event names */
2750 *namelist = probe_file__get_namelist(fd);
2751 if (!(*namelist)) {
2752 pr_debug("Failed to get current event list.\n");
2753 close(fd);
2754 return -ENOMEM;
2755 }
2756 return fd;
2757 }
2758
2759 static int __add_probe_trace_events(struct perf_probe_event *pev,
2760 struct probe_trace_event *tevs,
2761 int ntevs, bool allow_suffix)
2762 {
2763 int i, fd[2] = {-1, -1}, up, ret;
2764 struct probe_trace_event *tev = NULL;
2765 struct probe_cache *cache = NULL;
2766 struct strlist *namelist[2] = {NULL, NULL};
2767 struct nscookie nsc;
2768
2769 up = pev->uprobes ? 1 : 0;
2770 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2771 if (fd[up] < 0)
2772 return fd[up];
2773
2774 ret = 0;
2775 for (i = 0; i < ntevs; i++) {
2776 tev = &tevs[i];
2777 up = tev->uprobes ? 1 : 0;
2778 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2779 fd[up] = __open_probe_file_and_namelist(up,
2780 &namelist[up]);
2781 if (fd[up] < 0)
2782 goto close_out;
2783 }
2784 /* Skip if the symbol is out of .text or blacklisted */
2785 if (!tev->point.symbol && !pev->uprobes)
2786 continue;
2787
2788 /* Set new name for tev (and update namelist) */
2789 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2790 allow_suffix);
2791 if (ret < 0)
2792 break;
2793
2794 nsinfo__mountns_enter(pev->nsi, &nsc);
2795 ret = probe_file__add_event(fd[up], tev);
2796 nsinfo__mountns_exit(&nsc);
2797 if (ret < 0)
2798 break;
2799
2800 /*
2801 * Probes after the first probe which comes from same
2802 * user input are always allowed to add suffix, because
2803 * there might be several addresses corresponding to
2804 * one code line.
2805 */
2806 allow_suffix = true;
2807 }
2808 if (ret == -EINVAL && pev->uprobes)
2809 warn_uprobe_event_compat(tev);
2810 if (ret == 0 && probe_conf.cache) {
2811 cache = probe_cache__new(pev->target, pev->nsi);
2812 if (!cache ||
2813 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2814 probe_cache__commit(cache) < 0)
2815 pr_warning("Failed to add event to probe cache\n");
2816 probe_cache__delete(cache);
2817 }
2818
2819 close_out:
2820 for (up = 0; up < 2; up++) {
2821 strlist__delete(namelist[up]);
2822 if (fd[up] >= 0)
2823 close(fd[up]);
2824 }
2825 return ret;
2826 }
2827
2828 static int find_probe_functions(struct map *map, char *name,
2829 struct symbol **syms)
2830 {
2831 int found = 0;
2832 struct symbol *sym;
2833 struct rb_node *tmp;
2834 const char *norm, *ver;
2835 char *buf = NULL;
2836 bool cut_version = true;
2837
2838 if (map__load(map) < 0)
2839 return 0;
2840
2841 /* If user gives a version, don't cut off the version from symbols */
2842 if (strchr(name, '@'))
2843 cut_version = false;
2844
2845 map__for_each_symbol(map, sym, tmp) {
2846 norm = arch__normalize_symbol_name(sym->name);
2847 if (!norm)
2848 continue;
2849
2850 if (cut_version) {
2851 /* We don't care about default symbol or not */
2852 ver = strchr(norm, '@');
2853 if (ver) {
2854 buf = strndup(norm, ver - norm);
2855 if (!buf)
2856 return -ENOMEM;
2857 norm = buf;
2858 }
2859 }
2860
2861 if (strglobmatch(norm, name)) {
2862 found++;
2863 if (syms && found < probe_conf.max_probes)
2864 syms[found - 1] = sym;
2865 }
2866 if (buf)
2867 zfree(&buf);
2868 }
2869
2870 return found;
2871 }
2872
2873 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2874 struct probe_trace_event *tev __maybe_unused,
2875 struct map *map __maybe_unused,
2876 struct symbol *sym __maybe_unused) { }
2877
2878 /*
2879 * Find probe function addresses from map.
2880 * Return an error or the number of found probe_trace_event
2881 */
2882 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2883 struct probe_trace_event **tevs)
2884 {
2885 struct map *map = NULL;
2886 struct ref_reloc_sym *reloc_sym = NULL;
2887 struct symbol *sym;
2888 struct symbol **syms = NULL;
2889 struct probe_trace_event *tev;
2890 struct perf_probe_point *pp = &pev->point;
2891 struct probe_trace_point *tp;
2892 int num_matched_functions;
2893 int ret, i, j, skipped = 0;
2894 char *mod_name;
2895
2896 map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2897 if (!map) {
2898 ret = -EINVAL;
2899 goto out;
2900 }
2901
2902 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2903 if (!syms) {
2904 ret = -ENOMEM;
2905 goto out;
2906 }
2907
2908 /*
2909 * Load matched symbols: Since the different local symbols may have
2910 * same name but different addresses, this lists all the symbols.
2911 */
2912 num_matched_functions = find_probe_functions(map, pp->function, syms);
2913 if (num_matched_functions <= 0) {
2914 pr_err("Failed to find symbol %s in %s\n", pp->function,
2915 pev->target ? : "kernel");
2916 ret = -ENOENT;
2917 goto out;
2918 } else if (num_matched_functions > probe_conf.max_probes) {
2919 pr_err("Too many functions matched in %s\n",
2920 pev->target ? : "kernel");
2921 ret = -E2BIG;
2922 goto out;
2923 }
2924
2925 /* Note that the symbols in the kmodule are not relocated */
2926 if (!pev->uprobes && !pev->target &&
2927 (!pp->retprobe || kretprobe_offset_is_supported())) {
2928 reloc_sym = kernel_get_ref_reloc_sym();
2929 if (!reloc_sym) {
2930 pr_warning("Relocated base symbol is not found!\n");
2931 ret = -EINVAL;
2932 goto out;
2933 }
2934 }
2935
2936 /* Setup result trace-probe-events */
2937 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2938 if (!*tevs) {
2939 ret = -ENOMEM;
2940 goto out;
2941 }
2942
2943 ret = 0;
2944
2945 for (j = 0; j < num_matched_functions; j++) {
2946 sym = syms[j];
2947
2948 tev = (*tevs) + ret;
2949 tp = &tev->point;
2950 if (ret == num_matched_functions) {
2951 pr_warning("Too many symbols are listed. Skip it.\n");
2952 break;
2953 }
2954 ret++;
2955
2956 if (pp->offset > sym->end - sym->start) {
2957 pr_warning("Offset %ld is bigger than the size of %s\n",
2958 pp->offset, sym->name);
2959 ret = -ENOENT;
2960 goto err_out;
2961 }
2962 /* Add one probe point */
2963 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2964
2965 /* Check the kprobe (not in module) is within .text */
2966 if (!pev->uprobes && !pev->target &&
2967 kprobe_warn_out_range(sym->name, tp->address)) {
2968 tp->symbol = NULL; /* Skip it */
2969 skipped++;
2970 } else if (reloc_sym) {
2971 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2972 tp->offset = tp->address - reloc_sym->addr;
2973 } else {
2974 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2975 tp->offset = pp->offset;
2976 }
2977 tp->realname = strdup_or_goto(sym->name, nomem_out);
2978
2979 tp->retprobe = pp->retprobe;
2980 if (pev->target) {
2981 if (pev->uprobes) {
2982 tev->point.module = strdup_or_goto(pev->target,
2983 nomem_out);
2984 } else {
2985 mod_name = find_module_name(pev->target);
2986 tev->point.module =
2987 strdup(mod_name ? mod_name : pev->target);
2988 free(mod_name);
2989 if (!tev->point.module)
2990 goto nomem_out;
2991 }
2992 }
2993 tev->uprobes = pev->uprobes;
2994 tev->nargs = pev->nargs;
2995 if (tev->nargs) {
2996 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2997 tev->nargs);
2998 if (tev->args == NULL)
2999 goto nomem_out;
3000 }
3001 for (i = 0; i < tev->nargs; i++) {
3002 if (pev->args[i].name)
3003 tev->args[i].name =
3004 strdup_or_goto(pev->args[i].name,
3005 nomem_out);
3006
3007 tev->args[i].value = strdup_or_goto(pev->args[i].var,
3008 nomem_out);
3009 if (pev->args[i].type)
3010 tev->args[i].type =
3011 strdup_or_goto(pev->args[i].type,
3012 nomem_out);
3013 }
3014 arch__fix_tev_from_maps(pev, tev, map, sym);
3015 }
3016 if (ret == skipped) {
3017 ret = -ENOENT;
3018 goto err_out;
3019 }
3020
3021 out:
3022 map__put(map);
3023 free(syms);
3024 return ret;
3025
3026 nomem_out:
3027 ret = -ENOMEM;
3028 err_out:
3029 clear_probe_trace_events(*tevs, num_matched_functions);
3030 zfree(tevs);
3031 goto out;
3032 }
3033
3034 static int try_to_find_absolute_address(struct perf_probe_event *pev,
3035 struct probe_trace_event **tevs)
3036 {
3037 struct perf_probe_point *pp = &pev->point;
3038 struct probe_trace_event *tev;
3039 struct probe_trace_point *tp;
3040 int i, err;
3041
3042 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3043 return -EINVAL;
3044 if (perf_probe_event_need_dwarf(pev))
3045 return -EINVAL;
3046
3047 /*
3048 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3049 * absolute address.
3050 *
3051 * Only one tev can be generated by this.
3052 */
3053 *tevs = zalloc(sizeof(*tev));
3054 if (!*tevs)
3055 return -ENOMEM;
3056
3057 tev = *tevs;
3058 tp = &tev->point;
3059
3060 /*
3061 * Don't use tp->offset, use address directly, because
3062 * in synthesize_probe_trace_command() address cannot be
3063 * zero.
3064 */
3065 tp->address = pev->point.abs_address;
3066 tp->retprobe = pp->retprobe;
3067 tev->uprobes = pev->uprobes;
3068
3069 err = -ENOMEM;
3070 /*
3071 * Give it a '0x' leading symbol name.
3072 * In __add_probe_trace_events, a NULL symbol is interpreted as
3073 * invalid.
3074 */
3075 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3076 goto errout;
3077
3078 /* For kprobe, check range */
3079 if ((!tev->uprobes) &&
3080 (kprobe_warn_out_range(tev->point.symbol,
3081 tev->point.address))) {
3082 err = -EACCES;
3083 goto errout;
3084 }
3085
3086 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3087 goto errout;
3088
3089 if (pev->target) {
3090 tp->module = strdup(pev->target);
3091 if (!tp->module)
3092 goto errout;
3093 }
3094
3095 if (tev->group) {
3096 tev->group = strdup(pev->group);
3097 if (!tev->group)
3098 goto errout;
3099 }
3100
3101 if (pev->event) {
3102 tev->event = strdup(pev->event);
3103 if (!tev->event)
3104 goto errout;
3105 }
3106
3107 tev->nargs = pev->nargs;
3108 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3109 if (!tev->args)
3110 goto errout;
3111
3112 for (i = 0; i < tev->nargs; i++)
3113 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3114
3115 return 1;
3116
3117 errout:
3118 clear_probe_trace_events(*tevs, 1);
3119 *tevs = NULL;
3120 return err;
3121 }
3122
3123 /* Concatinate two arrays */
3124 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3125 {
3126 void *ret;
3127
3128 ret = malloc(sz_a + sz_b);
3129 if (ret) {
3130 memcpy(ret, a, sz_a);
3131 memcpy(ret + sz_a, b, sz_b);
3132 }
3133 return ret;
3134 }
3135
3136 static int
3137 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3138 struct probe_trace_event **tevs2, int ntevs2)
3139 {
3140 struct probe_trace_event *new_tevs;
3141 int ret = 0;
3142
3143 if (*ntevs == 0) {
3144 *tevs = *tevs2;
3145 *ntevs = ntevs2;
3146 *tevs2 = NULL;
3147 return 0;
3148 }
3149
3150 if (*ntevs + ntevs2 > probe_conf.max_probes)
3151 ret = -E2BIG;
3152 else {
3153 /* Concatinate the array of probe_trace_event */
3154 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3155 *tevs2, ntevs2 * sizeof(**tevs2));
3156 if (!new_tevs)
3157 ret = -ENOMEM;
3158 else {
3159 free(*tevs);
3160 *tevs = new_tevs;
3161 *ntevs += ntevs2;
3162 }
3163 }
3164 if (ret < 0)
3165 clear_probe_trace_events(*tevs2, ntevs2);
3166 zfree(tevs2);
3167
3168 return ret;
3169 }
3170
3171 /*
3172 * Try to find probe_trace_event from given probe caches. Return the number
3173 * of cached events found, if an error occurs return the error.
3174 */
3175 static int find_cached_events(struct perf_probe_event *pev,
3176 struct probe_trace_event **tevs,
3177 const char *target)
3178 {
3179 struct probe_cache *cache;
3180 struct probe_cache_entry *entry;
3181 struct probe_trace_event *tmp_tevs = NULL;
3182 int ntevs = 0;
3183 int ret = 0;
3184
3185 cache = probe_cache__new(target, pev->nsi);
3186 /* Return 0 ("not found") if the target has no probe cache. */
3187 if (!cache)
3188 return 0;
3189
3190 for_each_probe_cache_entry(entry, cache) {
3191 /* Skip the cache entry which has no name */
3192 if (!entry->pev.event || !entry->pev.group)
3193 continue;
3194 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3195 strglobmatch(entry->pev.event, pev->event)) {
3196 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3197 if (ret > 0)
3198 ret = concat_probe_trace_events(tevs, &ntevs,
3199 &tmp_tevs, ret);
3200 if (ret < 0)
3201 break;
3202 }
3203 }
3204 probe_cache__delete(cache);
3205 if (ret < 0) {
3206 clear_probe_trace_events(*tevs, ntevs);
3207 zfree(tevs);
3208 } else {
3209 ret = ntevs;
3210 if (ntevs > 0 && target && target[0] == '/')
3211 pev->uprobes = true;
3212 }
3213
3214 return ret;
3215 }
3216
3217 /* Try to find probe_trace_event from all probe caches */
3218 static int find_cached_events_all(struct perf_probe_event *pev,
3219 struct probe_trace_event **tevs)
3220 {
3221 struct probe_trace_event *tmp_tevs = NULL;
3222 struct strlist *bidlist;
3223 struct str_node *nd;
3224 char *pathname;
3225 int ntevs = 0;
3226 int ret;
3227
3228 /* Get the buildid list of all valid caches */
3229 bidlist = build_id_cache__list_all(true);
3230 if (!bidlist) {
3231 ret = -errno;
3232 pr_debug("Failed to get buildids: %d\n", ret);
3233 return ret;
3234 }
3235
3236 ret = 0;
3237 strlist__for_each_entry(nd, bidlist) {
3238 pathname = build_id_cache__origname(nd->s);
3239 ret = find_cached_events(pev, &tmp_tevs, pathname);
3240 /* In the case of cnt == 0, we just skip it */
3241 if (ret > 0)
3242 ret = concat_probe_trace_events(tevs, &ntevs,
3243 &tmp_tevs, ret);
3244 free(pathname);
3245 if (ret < 0)
3246 break;
3247 }
3248 strlist__delete(bidlist);
3249
3250 if (ret < 0) {
3251 clear_probe_trace_events(*tevs, ntevs);
3252 zfree(tevs);
3253 } else
3254 ret = ntevs;
3255
3256 return ret;
3257 }
3258
3259 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3260 struct probe_trace_event **tevs)
3261 {
3262 struct probe_cache *cache;
3263 struct probe_cache_entry *entry;
3264 struct probe_trace_event *tev;
3265 struct str_node *node;
3266 int ret, i;
3267
3268 if (pev->sdt) {
3269 /* For SDT/cached events, we use special search functions */
3270 if (!pev->target)
3271 return find_cached_events_all(pev, tevs);
3272 else
3273 return find_cached_events(pev, tevs, pev->target);
3274 }
3275 cache = probe_cache__new(pev->target, pev->nsi);
3276 if (!cache)
3277 return 0;
3278
3279 entry = probe_cache__find(cache, pev);
3280 if (!entry) {
3281 /* SDT must be in the cache */
3282 ret = pev->sdt ? -ENOENT : 0;
3283 goto out;
3284 }
3285
3286 ret = strlist__nr_entries(entry->tevlist);
3287 if (ret > probe_conf.max_probes) {
3288 pr_debug("Too many entries matched in the cache of %s\n",
3289 pev->target ? : "kernel");
3290 ret = -E2BIG;
3291 goto out;
3292 }
3293
3294 *tevs = zalloc(ret * sizeof(*tev));
3295 if (!*tevs) {
3296 ret = -ENOMEM;
3297 goto out;
3298 }
3299
3300 i = 0;
3301 strlist__for_each_entry(node, entry->tevlist) {
3302 tev = &(*tevs)[i++];
3303 ret = parse_probe_trace_command(node->s, tev);
3304 if (ret < 0)
3305 goto out;
3306 /* Set the uprobes attribute as same as original */
3307 tev->uprobes = pev->uprobes;
3308 }
3309 ret = i;
3310
3311 out:
3312 probe_cache__delete(cache);
3313 return ret;
3314 }
3315
3316 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3317 struct probe_trace_event **tevs)
3318 {
3319 int ret;
3320
3321 if (!pev->group && !pev->sdt) {
3322 /* Set group name if not given */
3323 if (!pev->uprobes) {
3324 pev->group = strdup(PERFPROBE_GROUP);
3325 ret = pev->group ? 0 : -ENOMEM;
3326 } else
3327 ret = convert_exec_to_group(pev->target, &pev->group);
3328 if (ret != 0) {
3329 pr_warning("Failed to make a group name.\n");
3330 return ret;
3331 }
3332 }
3333
3334 ret = try_to_find_absolute_address(pev, tevs);
3335 if (ret > 0)
3336 return ret;
3337
3338 /* At first, we need to lookup cache entry */
3339 ret = find_probe_trace_events_from_cache(pev, tevs);
3340 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3341 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3342
3343 /* Convert perf_probe_event with debuginfo */
3344 ret = try_to_find_probe_trace_events(pev, tevs);
3345 if (ret != 0)
3346 return ret; /* Found in debuginfo or got an error */
3347
3348 return find_probe_trace_events_from_map(pev, tevs);
3349 }
3350
3351 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3352 {
3353 int i, ret;
3354
3355 /* Loop 1: convert all events */
3356 for (i = 0; i < npevs; i++) {
3357 /* Init kprobe blacklist if needed */
3358 if (!pevs[i].uprobes)
3359 kprobe_blacklist__init();
3360 /* Convert with or without debuginfo */
3361 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3362 if (ret < 0)
3363 return ret;
3364 pevs[i].ntevs = ret;
3365 }
3366 /* This just release blacklist only if allocated */
3367 kprobe_blacklist__release();
3368
3369 return 0;
3370 }
3371
3372 static int show_probe_trace_event(struct probe_trace_event *tev)
3373 {
3374 char *buf = synthesize_probe_trace_command(tev);
3375
3376 if (!buf) {
3377 pr_debug("Failed to synthesize probe trace event.\n");
3378 return -EINVAL;
3379 }
3380
3381 /* Showing definition always go stdout */
3382 printf("%s\n", buf);
3383 free(buf);
3384
3385 return 0;
3386 }
3387
3388 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3389 {
3390 struct strlist *namelist = strlist__new(NULL, NULL);
3391 struct probe_trace_event *tev;
3392 struct perf_probe_event *pev;
3393 int i, j, ret = 0;
3394
3395 if (!namelist)
3396 return -ENOMEM;
3397
3398 for (j = 0; j < npevs && !ret; j++) {
3399 pev = &pevs[j];
3400 for (i = 0; i < pev->ntevs && !ret; i++) {
3401 tev = &pev->tevs[i];
3402 /* Skip if the symbol is out of .text or blacklisted */
3403 if (!tev->point.symbol && !pev->uprobes)
3404 continue;
3405
3406 /* Set new name for tev (and update namelist) */
3407 ret = probe_trace_event__set_name(tev, pev,
3408 namelist, true);
3409 if (!ret)
3410 ret = show_probe_trace_event(tev);
3411 }
3412 }
3413 strlist__delete(namelist);
3414
3415 return ret;
3416 }
3417
3418 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3419 {
3420 int i, ret = 0;
3421
3422 /* Loop 2: add all events */
3423 for (i = 0; i < npevs; i++) {
3424 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3425 pevs[i].ntevs,
3426 probe_conf.force_add);
3427 if (ret < 0)
3428 break;
3429 }
3430 return ret;
3431 }
3432
3433 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3434 {
3435 int i, j;
3436 struct perf_probe_event *pev;
3437
3438 /* Loop 3: cleanup and free trace events */
3439 for (i = 0; i < npevs; i++) {
3440 pev = &pevs[i];
3441 for (j = 0; j < pevs[i].ntevs; j++)
3442 clear_probe_trace_event(&pevs[i].tevs[j]);
3443 zfree(&pevs[i].tevs);
3444 pevs[i].ntevs = 0;
3445 nsinfo__zput(pev->nsi);
3446 clear_perf_probe_event(&pevs[i]);
3447 }
3448 }
3449
3450 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3451 {
3452 int ret;
3453
3454 ret = init_probe_symbol_maps(pevs->uprobes);
3455 if (ret < 0)
3456 return ret;
3457
3458 ret = convert_perf_probe_events(pevs, npevs);
3459 if (ret == 0)
3460 ret = apply_perf_probe_events(pevs, npevs);
3461
3462 cleanup_perf_probe_events(pevs, npevs);
3463
3464 exit_probe_symbol_maps();
3465 return ret;
3466 }
3467
3468 int del_perf_probe_events(struct strfilter *filter)
3469 {
3470 int ret, ret2, ufd = -1, kfd = -1;
3471 char *str = strfilter__string(filter);
3472
3473 if (!str)
3474 return -EINVAL;
3475
3476 /* Get current event names */
3477 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3478 if (ret < 0)
3479 goto out;
3480
3481 ret = probe_file__del_events(kfd, filter);
3482 if (ret < 0 && ret != -ENOENT)
3483 goto error;
3484
3485 ret2 = probe_file__del_events(ufd, filter);
3486 if (ret2 < 0 && ret2 != -ENOENT) {
3487 ret = ret2;
3488 goto error;
3489 }
3490 ret = 0;
3491
3492 error:
3493 if (kfd >= 0)
3494 close(kfd);
3495 if (ufd >= 0)
3496 close(ufd);
3497 out:
3498 free(str);
3499
3500 return ret;
3501 }
3502
3503 int show_available_funcs(const char *target, struct nsinfo *nsi,
3504 struct strfilter *_filter, bool user)
3505 {
3506 struct rb_node *nd;
3507 struct map *map;
3508 int ret;
3509
3510 ret = init_probe_symbol_maps(user);
3511 if (ret < 0)
3512 return ret;
3513
3514 /* Get a symbol map */
3515 map = get_target_map(target, nsi, user);
3516 if (!map) {
3517 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3518 return -EINVAL;
3519 }
3520
3521 ret = map__load(map);
3522 if (ret) {
3523 if (ret == -2) {
3524 char *str = strfilter__string(_filter);
3525 pr_err("Failed to find symbols matched to \"%s\"\n",
3526 str);
3527 free(str);
3528 } else
3529 pr_err("Failed to load symbols in %s\n",
3530 (target) ? : "kernel");
3531 goto end;
3532 }
3533 if (!dso__sorted_by_name(map->dso))
3534 dso__sort_by_name(map->dso);
3535
3536 /* Show all (filtered) symbols */
3537 setup_pager();
3538
3539 for (nd = rb_first_cached(&map->dso->symbol_names); nd;
3540 nd = rb_next(nd)) {
3541 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3542
3543 if (strfilter__compare(_filter, pos->sym.name))
3544 printf("%s\n", pos->sym.name);
3545 }
3546 end:
3547 map__put(map);
3548 exit_probe_symbol_maps();
3549
3550 return ret;
3551 }
3552
3553 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3554 struct perf_probe_arg *pvar)
3555 {
3556 tvar->value = strdup(pvar->var);
3557 if (tvar->value == NULL)
3558 return -ENOMEM;
3559 if (pvar->type) {
3560 tvar->type = strdup(pvar->type);
3561 if (tvar->type == NULL)
3562 return -ENOMEM;
3563 }
3564 if (pvar->name) {
3565 tvar->name = strdup(pvar->name);
3566 if (tvar->name == NULL)
3567 return -ENOMEM;
3568 } else
3569 tvar->name = NULL;
3570 return 0;
3571 }
Linux with added FPC-III support