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mmc: bcm2835: Fix DMA channel leak on probe error
[linux/fpc-iii.git] / tools / perf / util / probe-event.c
blobf119eb628dbb6974e60effa3ae7f766d23164194
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 "strlist.h"
39 #include "strfilter.h"
40 #include "debug.h"
41 #include "cache.h"
42 #include "color.h"
43 #include "symbol.h"
44 #include "thread.h"
45 #include <api/fs/fs.h>
46 #include "trace-event.h" /* For __maybe_unused */
47 #include "probe-event.h"
48 #include "probe-finder.h"
49 #include "probe-file.h"
50 #include "session.h"
51 #include "string2.h"
52
53 #include "sane_ctype.h"
54
55 #define PERFPROBE_GROUP "probe"
56
57 bool probe_event_dry_run; /* Dry run flag */
58 struct probe_conf probe_conf;
59
60 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
61
62 int e_snprintf(char *str, size_t size, const char *format, ...)
63 {
64 int ret;
65 va_list ap;
66 va_start(ap, format);
67 ret = vsnprintf(str, size, format, ap);
68 va_end(ap);
69 if (ret >= (int)size)
70 ret = -E2BIG;
71 return ret;
72 }
73
74 static struct machine *host_machine;
75
76 /* Initialize symbol maps and path of vmlinux/modules */
77 int init_probe_symbol_maps(bool user_only)
78 {
79 int ret;
80
81 symbol_conf.sort_by_name = true;
82 symbol_conf.allow_aliases = true;
83 ret = symbol__init(NULL);
84 if (ret < 0) {
85 pr_debug("Failed to init symbol map.\n");
86 goto out;
87 }
88
89 if (host_machine || user_only) /* already initialized */
90 return 0;
91
92 if (symbol_conf.vmlinux_name)
93 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
94
95 host_machine = machine__new_host();
96 if (!host_machine) {
97 pr_debug("machine__new_host() failed.\n");
98 symbol__exit();
99 ret = -1;
100 }
101 out:
102 if (ret < 0)
103 pr_warning("Failed to init vmlinux path.\n");
104 return ret;
105 }
106
107 void exit_probe_symbol_maps(void)
108 {
109 machine__delete(host_machine);
110 host_machine = NULL;
111 symbol__exit();
112 }
113
114 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
115 {
116 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
117 struct kmap *kmap;
118 struct map *map = machine__kernel_map(host_machine);
119
120 if (map__load(map) < 0)
121 return NULL;
122
123 kmap = map__kmap(map);
124 if (!kmap)
125 return NULL;
126 return kmap->ref_reloc_sym;
127 }
128
129 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
130 bool reloc, bool reladdr)
131 {
132 struct ref_reloc_sym *reloc_sym;
133 struct symbol *sym;
134 struct map *map;
135
136 /* ref_reloc_sym is just a label. Need a special fix*/
137 reloc_sym = kernel_get_ref_reloc_sym();
138 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
139 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
140 else {
141 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
142 if (!sym)
143 return -ENOENT;
144 *addr = map->unmap_ip(map, sym->start) -
145 ((reloc) ? 0 : map->reloc) -
146 ((reladdr) ? map->start : 0);
147 }
148 return 0;
149 }
150
151 static struct map *kernel_get_module_map(const char *module)
152 {
153 struct maps *maps = machine__kernel_maps(host_machine);
154 struct map *pos;
155
156 /* A file path -- this is an offline module */
157 if (module && strchr(module, '/'))
158 return dso__new_map(module);
159
160 if (!module)
161 module = "kernel";
162
163 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
164 /* short_name is "[module]" */
165 if (strncmp(pos->dso->short_name + 1, module,
166 pos->dso->short_name_len - 2) == 0 &&
167 module[pos->dso->short_name_len - 2] == '\0') {
168 return map__get(pos);
169 }
170 }
171 return NULL;
172 }
173
174 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
175 {
176 /* Init maps of given executable or kernel */
177 if (user) {
178 struct map *map;
179
180 map = dso__new_map(target);
181 if (map && map->dso)
182 map->dso->nsinfo = nsinfo__get(nsi);
183 return map;
184 } else {
185 return kernel_get_module_map(target);
186 }
187 }
188
189 static int convert_exec_to_group(const char *exec, char **result)
190 {
191 char *ptr1, *ptr2, *exec_copy;
192 char buf[64];
193 int ret;
194
195 exec_copy = strdup(exec);
196 if (!exec_copy)
197 return -ENOMEM;
198
199 ptr1 = basename(exec_copy);
200 if (!ptr1) {
201 ret = -EINVAL;
202 goto out;
203 }
204
205 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
206 if (!isalnum(*ptr2) && *ptr2 != '_') {
207 *ptr2 = '\0';
208 break;
209 }
210 }
211
212 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
213 if (ret < 0)
214 goto out;
215
216 *result = strdup(buf);
217 ret = *result ? 0 : -ENOMEM;
218
219 out:
220 free(exec_copy);
221 return ret;
222 }
223
224 static void clear_perf_probe_point(struct perf_probe_point *pp)
225 {
226 free(pp->file);
227 free(pp->function);
228 free(pp->lazy_line);
229 }
230
231 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
232 {
233 int i;
234
235 for (i = 0; i < ntevs; i++)
236 clear_probe_trace_event(tevs + i);
237 }
238
239 static bool kprobe_blacklist__listed(unsigned long address);
240 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
241 {
242 u64 etext_addr = 0;
243 int ret;
244
245 /* Get the address of _etext for checking non-probable text symbol */
246 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
247 false, false);
248
249 if (ret == 0 && etext_addr < address)
250 pr_warning("%s is out of .text, skip it.\n", symbol);
251 else if (kprobe_blacklist__listed(address))
252 pr_warning("%s is blacklisted function, skip it.\n", symbol);
253 else
254 return false;
255
256 return true;
257 }
258
259 /*
260 * @module can be module name of module file path. In case of path,
261 * inspect elf and find out what is actual module name.
262 * Caller has to free mod_name after using it.
263 */
264 static char *find_module_name(const char *module)
265 {
266 int fd;
267 Elf *elf;
268 GElf_Ehdr ehdr;
269 GElf_Shdr shdr;
270 Elf_Data *data;
271 Elf_Scn *sec;
272 char *mod_name = NULL;
273 int name_offset;
274
275 fd = open(module, O_RDONLY);
276 if (fd < 0)
277 return NULL;
278
279 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
280 if (elf == NULL)
281 goto elf_err;
282
283 if (gelf_getehdr(elf, &ehdr) == NULL)
284 goto ret_err;
285
286 sec = elf_section_by_name(elf, &ehdr, &shdr,
287 ".gnu.linkonce.this_module", NULL);
288 if (!sec)
289 goto ret_err;
290
291 data = elf_getdata(sec, NULL);
292 if (!data || !data->d_buf)
293 goto ret_err;
294
295 /*
296 * NOTE:
297 * '.gnu.linkonce.this_module' section of kernel module elf directly
298 * maps to 'struct module' from linux/module.h. This section contains
299 * actual module name which will be used by kernel after loading it.
300 * But, we cannot use 'struct module' here since linux/module.h is not
301 * exposed to user-space. Offset of 'name' has remained same from long
302 * time, so hardcoding it here.
303 */
304 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
305 name_offset = 12;
306 else /* expect ELFCLASS64 by default */
307 name_offset = 24;
308
309 mod_name = strdup((char *)data->d_buf + name_offset);
310
311 ret_err:
312 elf_end(elf);
313 elf_err:
314 close(fd);
315 return mod_name;
316 }
317
318 #ifdef HAVE_DWARF_SUPPORT
319
320 static int kernel_get_module_dso(const char *module, struct dso **pdso)
321 {
322 struct dso *dso;
323 struct map *map;
324 const char *vmlinux_name;
325 int ret = 0;
326
327 if (module) {
328 char module_name[128];
329
330 snprintf(module_name, sizeof(module_name), "[%s]", module);
331 map = map_groups__find_by_name(&host_machine->kmaps, module_name);
332 if (map) {
333 dso = map->dso;
334 goto found;
335 }
336 pr_debug("Failed to find module %s.\n", module);
337 return -ENOENT;
338 }
339
340 map = machine__kernel_map(host_machine);
341 dso = map->dso;
342
343 vmlinux_name = symbol_conf.vmlinux_name;
344 dso->load_errno = 0;
345 if (vmlinux_name)
346 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
347 else
348 ret = dso__load_vmlinux_path(dso, map);
349 found:
350 *pdso = dso;
351 return ret;
352 }
353
354 /*
355 * Some binaries like glibc have special symbols which are on the symbol
356 * table, but not in the debuginfo. If we can find the address of the
357 * symbol from map, we can translate the address back to the probe point.
358 */
359 static int find_alternative_probe_point(struct debuginfo *dinfo,
360 struct perf_probe_point *pp,
361 struct perf_probe_point *result,
362 const char *target, struct nsinfo *nsi,
363 bool uprobes)
364 {
365 struct map *map = NULL;
366 struct symbol *sym;
367 u64 address = 0;
368 int ret = -ENOENT;
369
370 /* This can work only for function-name based one */
371 if (!pp->function || pp->file)
372 return -ENOTSUP;
373
374 map = get_target_map(target, nsi, uprobes);
375 if (!map)
376 return -EINVAL;
377
378 /* Find the address of given function */
379 map__for_each_symbol_by_name(map, pp->function, sym) {
380 if (uprobes)
381 address = sym->start;
382 else
383 address = map->unmap_ip(map, sym->start) - map->reloc;
384 break;
385 }
386 if (!address) {
387 ret = -ENOENT;
388 goto out;
389 }
390 pr_debug("Symbol %s address found : %" PRIx64 "\n",
391 pp->function, address);
392
393 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
394 result);
395 if (ret <= 0)
396 ret = (!ret) ? -ENOENT : ret;
397 else {
398 result->offset += pp->offset;
399 result->line += pp->line;
400 result->retprobe = pp->retprobe;
401 ret = 0;
402 }
403
404 out:
405 map__put(map);
406 return ret;
407
408 }
409
410 static int get_alternative_probe_event(struct debuginfo *dinfo,
411 struct perf_probe_event *pev,
412 struct perf_probe_point *tmp)
413 {
414 int ret;
415
416 memcpy(tmp, &pev->point, sizeof(*tmp));
417 memset(&pev->point, 0, sizeof(pev->point));
418 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
419 pev->nsi, pev->uprobes);
420 if (ret < 0)
421 memcpy(&pev->point, tmp, sizeof(*tmp));
422
423 return ret;
424 }
425
426 static int get_alternative_line_range(struct debuginfo *dinfo,
427 struct line_range *lr,
428 const char *target, bool user)
429 {
430 struct perf_probe_point pp = { .function = lr->function,
431 .file = lr->file,
432 .line = lr->start };
433 struct perf_probe_point result;
434 int ret, len = 0;
435
436 memset(&result, 0, sizeof(result));
437
438 if (lr->end != INT_MAX)
439 len = lr->end - lr->start;
440 ret = find_alternative_probe_point(dinfo, &pp, &result,
441 target, NULL, user);
442 if (!ret) {
443 lr->function = result.function;
444 lr->file = result.file;
445 lr->start = result.line;
446 if (lr->end != INT_MAX)
447 lr->end = lr->start + len;
448 clear_perf_probe_point(&pp);
449 }
450 return ret;
451 }
452
453 /* Open new debuginfo of given module */
454 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
455 bool silent)
456 {
457 const char *path = module;
458 char reason[STRERR_BUFSIZE];
459 struct debuginfo *ret = NULL;
460 struct dso *dso = NULL;
461 struct nscookie nsc;
462 int err;
463
464 if (!module || !strchr(module, '/')) {
465 err = kernel_get_module_dso(module, &dso);
466 if (err < 0) {
467 if (!dso || dso->load_errno == 0) {
468 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
469 strcpy(reason, "(unknown)");
470 } else
471 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
472 if (!silent)
473 pr_err("Failed to find the path for %s: %s\n",
474 module ?: "kernel", reason);
475 return NULL;
476 }
477 path = dso->long_name;
478 }
479 nsinfo__mountns_enter(nsi, &nsc);
480 ret = debuginfo__new(path);
481 if (!ret && !silent) {
482 pr_warning("The %s file has no debug information.\n", path);
483 if (!module || !strtailcmp(path, ".ko"))
484 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
485 else
486 pr_warning("Rebuild with -g, ");
487 pr_warning("or install an appropriate debuginfo package.\n");
488 }
489 nsinfo__mountns_exit(&nsc);
490 return ret;
491 }
492
493 /* For caching the last debuginfo */
494 static struct debuginfo *debuginfo_cache;
495 static char *debuginfo_cache_path;
496
497 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
498 {
499 const char *path = module;
500
501 /* If the module is NULL, it should be the kernel. */
502 if (!module)
503 path = "kernel";
504
505 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
506 goto out;
507
508 /* Copy module path */
509 free(debuginfo_cache_path);
510 debuginfo_cache_path = strdup(path);
511 if (!debuginfo_cache_path) {
512 debuginfo__delete(debuginfo_cache);
513 debuginfo_cache = NULL;
514 goto out;
515 }
516
517 debuginfo_cache = open_debuginfo(module, NULL, silent);
518 if (!debuginfo_cache)
519 zfree(&debuginfo_cache_path);
520 out:
521 return debuginfo_cache;
522 }
523
524 static void debuginfo_cache__exit(void)
525 {
526 debuginfo__delete(debuginfo_cache);
527 debuginfo_cache = NULL;
528 zfree(&debuginfo_cache_path);
529 }
530
531
532 static int get_text_start_address(const char *exec, unsigned long *address,
533 struct nsinfo *nsi)
534 {
535 Elf *elf;
536 GElf_Ehdr ehdr;
537 GElf_Shdr shdr;
538 int fd, ret = -ENOENT;
539 struct nscookie nsc;
540
541 nsinfo__mountns_enter(nsi, &nsc);
542 fd = open(exec, O_RDONLY);
543 nsinfo__mountns_exit(&nsc);
544 if (fd < 0)
545 return -errno;
546
547 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
548 if (elf == NULL) {
549 ret = -EINVAL;
550 goto out_close;
551 }
552
553 if (gelf_getehdr(elf, &ehdr) == NULL)
554 goto out;
555
556 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
557 goto out;
558
559 *address = shdr.sh_addr - shdr.sh_offset;
560 ret = 0;
561 out:
562 elf_end(elf);
563 out_close:
564 close(fd);
565
566 return ret;
567 }
568
569 /*
570 * Convert trace point to probe point with debuginfo
571 */
572 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
573 struct perf_probe_point *pp,
574 bool is_kprobe)
575 {
576 struct debuginfo *dinfo = NULL;
577 unsigned long stext = 0;
578 u64 addr = tp->address;
579 int ret = -ENOENT;
580
581 /* convert the address to dwarf address */
582 if (!is_kprobe) {
583 if (!addr) {
584 ret = -EINVAL;
585 goto error;
586 }
587 ret = get_text_start_address(tp->module, &stext, NULL);
588 if (ret < 0)
589 goto error;
590 addr += stext;
591 } else if (tp->symbol) {
592 /* If the module is given, this returns relative address */
593 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
594 false, !!tp->module);
595 if (ret != 0)
596 goto error;
597 addr += tp->offset;
598 }
599
600 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
601 tp->module ? : "kernel");
602
603 dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
604 if (dinfo)
605 ret = debuginfo__find_probe_point(dinfo,
606 (unsigned long)addr, pp);
607 else
608 ret = -ENOENT;
609
610 if (ret > 0) {
611 pp->retprobe = tp->retprobe;
612 return 0;
613 }
614 error:
615 pr_debug("Failed to find corresponding probes from debuginfo.\n");
616 return ret ? : -ENOENT;
617 }
618
619 /* Adjust symbol name and address */
620 static int post_process_probe_trace_point(struct probe_trace_point *tp,
621 struct map *map, unsigned long offs)
622 {
623 struct symbol *sym;
624 u64 addr = tp->address - offs;
625
626 sym = map__find_symbol(map, addr);
627 if (!sym)
628 return -ENOENT;
629
630 if (strcmp(sym->name, tp->symbol)) {
631 /* If we have no realname, use symbol for it */
632 if (!tp->realname)
633 tp->realname = tp->symbol;
634 else
635 free(tp->symbol);
636 tp->symbol = strdup(sym->name);
637 if (!tp->symbol)
638 return -ENOMEM;
639 }
640 tp->offset = addr - sym->start;
641 tp->address -= offs;
642
643 return 0;
644 }
645
646 /*
647 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
648 * and generate new symbols with suffixes such as .constprop.N or .isra.N
649 * etc. Since those symbols are not recorded in DWARF, we have to find
650 * correct generated symbols from offline ELF binary.
651 * For online kernel or uprobes we don't need this because those are
652 * rebased on _text, or already a section relative address.
653 */
654 static int
655 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
656 int ntevs, const char *pathname)
657 {
658 struct map *map;
659 unsigned long stext = 0;
660 int i, ret = 0;
661
662 /* Prepare a map for offline binary */
663 map = dso__new_map(pathname);
664 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
665 pr_warning("Failed to get ELF symbols for %s\n", pathname);
666 return -EINVAL;
667 }
668
669 for (i = 0; i < ntevs; i++) {
670 ret = post_process_probe_trace_point(&tevs[i].point,
671 map, stext);
672 if (ret < 0)
673 break;
674 }
675 map__put(map);
676
677 return ret;
678 }
679
680 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
681 int ntevs, const char *exec,
682 struct nsinfo *nsi)
683 {
684 int i, ret = 0;
685 unsigned long stext = 0;
686
687 if (!exec)
688 return 0;
689
690 ret = get_text_start_address(exec, &stext, nsi);
691 if (ret < 0)
692 return ret;
693
694 for (i = 0; i < ntevs && ret >= 0; i++) {
695 /* point.address is the addres of point.symbol + point.offset */
696 tevs[i].point.address -= stext;
697 tevs[i].point.module = strdup(exec);
698 if (!tevs[i].point.module) {
699 ret = -ENOMEM;
700 break;
701 }
702 tevs[i].uprobes = true;
703 }
704
705 return ret;
706 }
707
708 static int
709 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
710 int ntevs, const char *module,
711 struct debuginfo *dinfo)
712 {
713 Dwarf_Addr text_offs = 0;
714 int i, ret = 0;
715 char *mod_name = NULL;
716 struct map *map;
717
718 if (!module)
719 return 0;
720
721 map = get_target_map(module, NULL, false);
722 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
723 pr_warning("Failed to get ELF symbols for %s\n", module);
724 return -EINVAL;
725 }
726
727 mod_name = find_module_name(module);
728 for (i = 0; i < ntevs; i++) {
729 ret = post_process_probe_trace_point(&tevs[i].point,
730 map, (unsigned long)text_offs);
731 if (ret < 0)
732 break;
733 tevs[i].point.module =
734 strdup(mod_name ? mod_name : module);
735 if (!tevs[i].point.module) {
736 ret = -ENOMEM;
737 break;
738 }
739 }
740
741 free(mod_name);
742 map__put(map);
743
744 return ret;
745 }
746
747 static int
748 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
749 int ntevs)
750 {
751 struct ref_reloc_sym *reloc_sym;
752 char *tmp;
753 int i, skipped = 0;
754
755 /* Skip post process if the target is an offline kernel */
756 if (symbol_conf.ignore_vmlinux_buildid)
757 return post_process_offline_probe_trace_events(tevs, ntevs,
758 symbol_conf.vmlinux_name);
759
760 reloc_sym = kernel_get_ref_reloc_sym();
761 if (!reloc_sym) {
762 pr_warning("Relocated base symbol is not found!\n");
763 return -EINVAL;
764 }
765
766 for (i = 0; i < ntevs; i++) {
767 if (!tevs[i].point.address)
768 continue;
769 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
770 continue;
771 /* If we found a wrong one, mark it by NULL symbol */
772 if (kprobe_warn_out_range(tevs[i].point.symbol,
773 tevs[i].point.address)) {
774 tmp = NULL;
775 skipped++;
776 } else {
777 tmp = strdup(reloc_sym->name);
778 if (!tmp)
779 return -ENOMEM;
780 }
781 /* If we have no realname, use symbol for it */
782 if (!tevs[i].point.realname)
783 tevs[i].point.realname = tevs[i].point.symbol;
784 else
785 free(tevs[i].point.symbol);
786 tevs[i].point.symbol = tmp;
787 tevs[i].point.offset = tevs[i].point.address -
788 reloc_sym->unrelocated_addr;
789 }
790 return skipped;
791 }
792
793 void __weak
794 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
795 int ntevs __maybe_unused)
796 {
797 }
798
799 /* Post processing the probe events */
800 static int post_process_probe_trace_events(struct perf_probe_event *pev,
801 struct probe_trace_event *tevs,
802 int ntevs, const char *module,
803 bool uprobe, struct debuginfo *dinfo)
804 {
805 int ret;
806
807 if (uprobe)
808 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
809 pev->nsi);
810 else if (module)
811 /* Currently ref_reloc_sym based probe is not for drivers */
812 ret = post_process_module_probe_trace_events(tevs, ntevs,
813 module, dinfo);
814 else
815 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
816
817 if (ret >= 0)
818 arch__post_process_probe_trace_events(pev, ntevs);
819
820 return ret;
821 }
822
823 /* Try to find perf_probe_event with debuginfo */
824 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
825 struct probe_trace_event **tevs)
826 {
827 bool need_dwarf = perf_probe_event_need_dwarf(pev);
828 struct perf_probe_point tmp;
829 struct debuginfo *dinfo;
830 int ntevs, ret = 0;
831
832 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
833 if (!dinfo) {
834 if (need_dwarf)
835 return -ENOENT;
836 pr_debug("Could not open debuginfo. Try to use symbols.\n");
837 return 0;
838 }
839
840 pr_debug("Try to find probe point from debuginfo.\n");
841 /* Searching trace events corresponding to a probe event */
842 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
843
844 if (ntevs == 0) { /* Not found, retry with an alternative */
845 ret = get_alternative_probe_event(dinfo, pev, &tmp);
846 if (!ret) {
847 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
848 /*
849 * Write back to the original probe_event for
850 * setting appropriate (user given) event name
851 */
852 clear_perf_probe_point(&pev->point);
853 memcpy(&pev->point, &tmp, sizeof(tmp));
854 }
855 }
856
857 if (ntevs > 0) { /* Succeeded to find trace events */
858 pr_debug("Found %d probe_trace_events.\n", ntevs);
859 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
860 pev->target, pev->uprobes, dinfo);
861 if (ret < 0 || ret == ntevs) {
862 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
863 clear_probe_trace_events(*tevs, ntevs);
864 zfree(tevs);
865 ntevs = 0;
866 }
867 }
868
869 debuginfo__delete(dinfo);
870
871 if (ntevs == 0) { /* No error but failed to find probe point. */
872 pr_warning("Probe point '%s' not found.\n",
873 synthesize_perf_probe_point(&pev->point));
874 return -ENOENT;
875 } else if (ntevs < 0) {
876 /* Error path : ntevs < 0 */
877 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
878 if (ntevs == -EBADF)
879 pr_warning("Warning: No dwarf info found in the vmlinux - "
880 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
881 if (!need_dwarf) {
882 pr_debug("Trying to use symbols.\n");
883 return 0;
884 }
885 }
886 return ntevs;
887 }
888
889 #define LINEBUF_SIZE 256
890 #define NR_ADDITIONAL_LINES 2
891
892 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
893 {
894 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
895 const char *color = show_num ? "" : PERF_COLOR_BLUE;
896 const char *prefix = NULL;
897
898 do {
899 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
900 goto error;
901 if (skip)
902 continue;
903 if (!prefix) {
904 prefix = show_num ? "%7d " : " ";
905 color_fprintf(stdout, color, prefix, l);
906 }
907 color_fprintf(stdout, color, "%s", buf);
908
909 } while (strchr(buf, '\n') == NULL);
910
911 return 1;
912 error:
913 if (ferror(fp)) {
914 pr_warning("File read error: %s\n",
915 str_error_r(errno, sbuf, sizeof(sbuf)));
916 return -1;
917 }
918 return 0;
919 }
920
921 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
922 {
923 int rv = __show_one_line(fp, l, skip, show_num);
924 if (rv == 0) {
925 pr_warning("Source file is shorter than expected.\n");
926 rv = -1;
927 }
928 return rv;
929 }
930
931 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
932 #define show_one_line(f,l) _show_one_line(f,l,false,false)
933 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
934 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
935
936 /*
937 * Show line-range always requires debuginfo to find source file and
938 * line number.
939 */
940 static int __show_line_range(struct line_range *lr, const char *module,
941 bool user)
942 {
943 int l = 1;
944 struct int_node *ln;
945 struct debuginfo *dinfo;
946 FILE *fp;
947 int ret;
948 char *tmp;
949 char sbuf[STRERR_BUFSIZE];
950
951 /* Search a line range */
952 dinfo = open_debuginfo(module, NULL, false);
953 if (!dinfo)
954 return -ENOENT;
955
956 ret = debuginfo__find_line_range(dinfo, lr);
957 if (!ret) { /* Not found, retry with an alternative */
958 ret = get_alternative_line_range(dinfo, lr, module, user);
959 if (!ret)
960 ret = debuginfo__find_line_range(dinfo, lr);
961 }
962 debuginfo__delete(dinfo);
963 if (ret == 0 || ret == -ENOENT) {
964 pr_warning("Specified source line is not found.\n");
965 return -ENOENT;
966 } else if (ret < 0) {
967 pr_warning("Debuginfo analysis failed.\n");
968 return ret;
969 }
970
971 /* Convert source file path */
972 tmp = lr->path;
973 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
974
975 /* Free old path when new path is assigned */
976 if (tmp != lr->path)
977 free(tmp);
978
979 if (ret < 0) {
980 pr_warning("Failed to find source file path.\n");
981 return ret;
982 }
983
984 setup_pager();
985
986 if (lr->function)
987 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
988 lr->start - lr->offset);
989 else
990 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
991
992 fp = fopen(lr->path, "r");
993 if (fp == NULL) {
994 pr_warning("Failed to open %s: %s\n", lr->path,
995 str_error_r(errno, sbuf, sizeof(sbuf)));
996 return -errno;
997 }
998 /* Skip to starting line number */
999 while (l < lr->start) {
1000 ret = skip_one_line(fp, l++);
1001 if (ret < 0)
1002 goto end;
1003 }
1004
1005 intlist__for_each_entry(ln, lr->line_list) {
1006 for (; ln->i > l; l++) {
1007 ret = show_one_line(fp, l - lr->offset);
1008 if (ret < 0)
1009 goto end;
1010 }
1011 ret = show_one_line_with_num(fp, l++ - lr->offset);
1012 if (ret < 0)
1013 goto end;
1014 }
1015
1016 if (lr->end == INT_MAX)
1017 lr->end = l + NR_ADDITIONAL_LINES;
1018 while (l <= lr->end) {
1019 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1020 if (ret <= 0)
1021 break;
1022 }
1023 end:
1024 fclose(fp);
1025 return ret;
1026 }
1027
1028 int show_line_range(struct line_range *lr, const char *module,
1029 struct nsinfo *nsi, bool user)
1030 {
1031 int ret;
1032 struct nscookie nsc;
1033
1034 ret = init_probe_symbol_maps(user);
1035 if (ret < 0)
1036 return ret;
1037 nsinfo__mountns_enter(nsi, &nsc);
1038 ret = __show_line_range(lr, module, user);
1039 nsinfo__mountns_exit(&nsc);
1040 exit_probe_symbol_maps();
1041
1042 return ret;
1043 }
1044
1045 static int show_available_vars_at(struct debuginfo *dinfo,
1046 struct perf_probe_event *pev,
1047 struct strfilter *_filter)
1048 {
1049 char *buf;
1050 int ret, i, nvars;
1051 struct str_node *node;
1052 struct variable_list *vls = NULL, *vl;
1053 struct perf_probe_point tmp;
1054 const char *var;
1055
1056 buf = synthesize_perf_probe_point(&pev->point);
1057 if (!buf)
1058 return -EINVAL;
1059 pr_debug("Searching variables at %s\n", buf);
1060
1061 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1062 if (!ret) { /* Not found, retry with an alternative */
1063 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1064 if (!ret) {
1065 ret = debuginfo__find_available_vars_at(dinfo, pev,
1066 &vls);
1067 /* Release the old probe_point */
1068 clear_perf_probe_point(&tmp);
1069 }
1070 }
1071 if (ret <= 0) {
1072 if (ret == 0 || ret == -ENOENT) {
1073 pr_err("Failed to find the address of %s\n", buf);
1074 ret = -ENOENT;
1075 } else
1076 pr_warning("Debuginfo analysis failed.\n");
1077 goto end;
1078 }
1079
1080 /* Some variables are found */
1081 fprintf(stdout, "Available variables at %s\n", buf);
1082 for (i = 0; i < ret; i++) {
1083 vl = &vls[i];
1084 /*
1085 * A probe point might be converted to
1086 * several trace points.
1087 */
1088 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1089 vl->point.offset);
1090 zfree(&vl->point.symbol);
1091 nvars = 0;
1092 if (vl->vars) {
1093 strlist__for_each_entry(node, vl->vars) {
1094 var = strchr(node->s, '\t') + 1;
1095 if (strfilter__compare(_filter, var)) {
1096 fprintf(stdout, "\t\t%s\n", node->s);
1097 nvars++;
1098 }
1099 }
1100 strlist__delete(vl->vars);
1101 }
1102 if (nvars == 0)
1103 fprintf(stdout, "\t\t(No matched variables)\n");
1104 }
1105 free(vls);
1106 end:
1107 free(buf);
1108 return ret;
1109 }
1110
1111 /* Show available variables on given probe point */
1112 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1113 struct strfilter *_filter)
1114 {
1115 int i, ret = 0;
1116 struct debuginfo *dinfo;
1117
1118 ret = init_probe_symbol_maps(pevs->uprobes);
1119 if (ret < 0)
1120 return ret;
1121
1122 dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1123 if (!dinfo) {
1124 ret = -ENOENT;
1125 goto out;
1126 }
1127
1128 setup_pager();
1129
1130 for (i = 0; i < npevs && ret >= 0; i++)
1131 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1132
1133 debuginfo__delete(dinfo);
1134 out:
1135 exit_probe_symbol_maps();
1136 return ret;
1137 }
1138
1139 #else /* !HAVE_DWARF_SUPPORT */
1140
1141 static void debuginfo_cache__exit(void)
1142 {
1143 }
1144
1145 static int
1146 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1147 struct perf_probe_point *pp __maybe_unused,
1148 bool is_kprobe __maybe_unused)
1149 {
1150 return -ENOSYS;
1151 }
1152
1153 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1154 struct probe_trace_event **tevs __maybe_unused)
1155 {
1156 if (perf_probe_event_need_dwarf(pev)) {
1157 pr_warning("Debuginfo-analysis is not supported.\n");
1158 return -ENOSYS;
1159 }
1160
1161 return 0;
1162 }
1163
1164 int show_line_range(struct line_range *lr __maybe_unused,
1165 const char *module __maybe_unused,
1166 struct nsinfo *nsi __maybe_unused,
1167 bool user __maybe_unused)
1168 {
1169 pr_warning("Debuginfo-analysis is not supported.\n");
1170 return -ENOSYS;
1171 }
1172
1173 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1174 int npevs __maybe_unused,
1175 struct strfilter *filter __maybe_unused)
1176 {
1177 pr_warning("Debuginfo-analysis is not supported.\n");
1178 return -ENOSYS;
1179 }
1180 #endif
1181
1182 void line_range__clear(struct line_range *lr)
1183 {
1184 free(lr->function);
1185 free(lr->file);
1186 free(lr->path);
1187 free(lr->comp_dir);
1188 intlist__delete(lr->line_list);
1189 memset(lr, 0, sizeof(*lr));
1190 }
1191
1192 int line_range__init(struct line_range *lr)
1193 {
1194 memset(lr, 0, sizeof(*lr));
1195 lr->line_list = intlist__new(NULL);
1196 if (!lr->line_list)
1197 return -ENOMEM;
1198 else
1199 return 0;
1200 }
1201
1202 static int parse_line_num(char **ptr, int *val, const char *what)
1203 {
1204 const char *start = *ptr;
1205
1206 errno = 0;
1207 *val = strtol(*ptr, ptr, 0);
1208 if (errno || *ptr == start) {
1209 semantic_error("'%s' is not a valid number.\n", what);
1210 return -EINVAL;
1211 }
1212 return 0;
1213 }
1214
1215 /* Check the name is good for event, group or function */
1216 static bool is_c_func_name(const char *name)
1217 {
1218 if (!isalpha(*name) && *name != '_')
1219 return false;
1220 while (*++name != '\0') {
1221 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1222 return false;
1223 }
1224 return true;
1225 }
1226
1227 /*
1228 * Stuff 'lr' according to the line range described by 'arg'.
1229 * The line range syntax is described by:
1230 *
1231 * SRC[:SLN[+NUM|-ELN]]
1232 * FNC[@SRC][:SLN[+NUM|-ELN]]
1233 */
1234 int parse_line_range_desc(const char *arg, struct line_range *lr)
1235 {
1236 char *range, *file, *name = strdup(arg);
1237 int err;
1238
1239 if (!name)
1240 return -ENOMEM;
1241
1242 lr->start = 0;
1243 lr->end = INT_MAX;
1244
1245 range = strchr(name, ':');
1246 if (range) {
1247 *range++ = '\0';
1248
1249 err = parse_line_num(&range, &lr->start, "start line");
1250 if (err)
1251 goto err;
1252
1253 if (*range == '+' || *range == '-') {
1254 const char c = *range++;
1255
1256 err = parse_line_num(&range, &lr->end, "end line");
1257 if (err)
1258 goto err;
1259
1260 if (c == '+') {
1261 lr->end += lr->start;
1262 /*
1263 * Adjust the number of lines here.
1264 * If the number of lines == 1, the
1265 * the end of line should be equal to
1266 * the start of line.
1267 */
1268 lr->end--;
1269 }
1270 }
1271
1272 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1273
1274 err = -EINVAL;
1275 if (lr->start > lr->end) {
1276 semantic_error("Start line must be smaller"
1277 " than end line.\n");
1278 goto err;
1279 }
1280 if (*range != '\0') {
1281 semantic_error("Tailing with invalid str '%s'.\n", range);
1282 goto err;
1283 }
1284 }
1285
1286 file = strchr(name, '@');
1287 if (file) {
1288 *file = '\0';
1289 lr->file = strdup(++file);
1290 if (lr->file == NULL) {
1291 err = -ENOMEM;
1292 goto err;
1293 }
1294 lr->function = name;
1295 } else if (strchr(name, '/') || strchr(name, '.'))
1296 lr->file = name;
1297 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1298 lr->function = name;
1299 else { /* Invalid name */
1300 semantic_error("'%s' is not a valid function name.\n", name);
1301 err = -EINVAL;
1302 goto err;
1303 }
1304
1305 return 0;
1306 err:
1307 free(name);
1308 return err;
1309 }
1310
1311 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1312 {
1313 char *ptr;
1314
1315 ptr = strpbrk_esc(*arg, ":");
1316 if (ptr) {
1317 *ptr = '\0';
1318 if (!pev->sdt && !is_c_func_name(*arg))
1319 goto ng_name;
1320 pev->group = strdup_esc(*arg);
1321 if (!pev->group)
1322 return -ENOMEM;
1323 *arg = ptr + 1;
1324 } else
1325 pev->group = NULL;
1326
1327 pev->event = strdup_esc(*arg);
1328 if (pev->event == NULL)
1329 return -ENOMEM;
1330
1331 if (!pev->sdt && !is_c_func_name(pev->event)) {
1332 zfree(&pev->event);
1333 ng_name:
1334 zfree(&pev->group);
1335 semantic_error("%s is bad for event name -it must "
1336 "follow C symbol-naming rule.\n", *arg);
1337 return -EINVAL;
1338 }
1339 return 0;
1340 }
1341
1342 /* Parse probepoint definition. */
1343 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1344 {
1345 struct perf_probe_point *pp = &pev->point;
1346 char *ptr, *tmp;
1347 char c, nc = 0;
1348 bool file_spec = false;
1349 int ret;
1350
1351 /*
1352 * <Syntax>
1353 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1354 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1355 * perf probe %[GRP:]SDT_EVENT
1356 */
1357 if (!arg)
1358 return -EINVAL;
1359
1360 if (is_sdt_event(arg)) {
1361 pev->sdt = true;
1362 if (arg[0] == '%')
1363 arg++;
1364 }
1365
1366 ptr = strpbrk_esc(arg, ";=@+%");
1367 if (pev->sdt) {
1368 if (ptr) {
1369 if (*ptr != '@') {
1370 semantic_error("%s must be an SDT name.\n",
1371 arg);
1372 return -EINVAL;
1373 }
1374 /* This must be a target file name or build id */
1375 tmp = build_id_cache__complement(ptr + 1);
1376 if (tmp) {
1377 pev->target = build_id_cache__origname(tmp);
1378 free(tmp);
1379 } else
1380 pev->target = strdup_esc(ptr + 1);
1381 if (!pev->target)
1382 return -ENOMEM;
1383 *ptr = '\0';
1384 }
1385 ret = parse_perf_probe_event_name(&arg, pev);
1386 if (ret == 0) {
1387 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1388 ret = -errno;
1389 }
1390 return ret;
1391 }
1392
1393 if (ptr && *ptr == '=') { /* Event name */
1394 *ptr = '\0';
1395 tmp = ptr + 1;
1396 ret = parse_perf_probe_event_name(&arg, pev);
1397 if (ret < 0)
1398 return ret;
1399
1400 arg = tmp;
1401 }
1402
1403 /*
1404 * Check arg is function or file name and copy it.
1405 *
1406 * We consider arg to be a file spec if and only if it satisfies
1407 * all of the below criteria::
1408 * - it does not include any of "+@%",
1409 * - it includes one of ":;", and
1410 * - it has a period '.' in the name.
1411 *
1412 * Otherwise, we consider arg to be a function specification.
1413 */
1414 if (!strpbrk_esc(arg, "+@%")) {
1415 ptr = strpbrk_esc(arg, ";:");
1416 /* This is a file spec if it includes a '.' before ; or : */
1417 if (ptr && memchr(arg, '.', ptr - arg))
1418 file_spec = true;
1419 }
1420
1421 ptr = strpbrk_esc(arg, ";:+@%");
1422 if (ptr) {
1423 nc = *ptr;
1424 *ptr++ = '\0';
1425 }
1426
1427 if (arg[0] == '\0')
1428 tmp = NULL;
1429 else {
1430 tmp = strdup_esc(arg);
1431 if (tmp == NULL)
1432 return -ENOMEM;
1433 }
1434
1435 if (file_spec)
1436 pp->file = tmp;
1437 else {
1438 pp->function = tmp;
1439
1440 /*
1441 * Keep pp->function even if this is absolute address,
1442 * so it can mark whether abs_address is valid.
1443 * Which make 'perf probe lib.bin 0x0' possible.
1444 *
1445 * Note that checking length of tmp is not needed
1446 * because when we access tmp[1] we know tmp[0] is '0',
1447 * so tmp[1] should always valid (but could be '\0').
1448 */
1449 if (tmp && !strncmp(tmp, "0x", 2)) {
1450 pp->abs_address = strtoul(pp->function, &tmp, 0);
1451 if (*tmp != '\0') {
1452 semantic_error("Invalid absolute address.\n");
1453 return -EINVAL;
1454 }
1455 }
1456 }
1457
1458 /* Parse other options */
1459 while (ptr) {
1460 arg = ptr;
1461 c = nc;
1462 if (c == ';') { /* Lazy pattern must be the last part */
1463 pp->lazy_line = strdup(arg); /* let leave escapes */
1464 if (pp->lazy_line == NULL)
1465 return -ENOMEM;
1466 break;
1467 }
1468 ptr = strpbrk_esc(arg, ";:+@%");
1469 if (ptr) {
1470 nc = *ptr;
1471 *ptr++ = '\0';
1472 }
1473 switch (c) {
1474 case ':': /* Line number */
1475 pp->line = strtoul(arg, &tmp, 0);
1476 if (*tmp != '\0') {
1477 semantic_error("There is non-digit char"
1478 " in line number.\n");
1479 return -EINVAL;
1480 }
1481 break;
1482 case '+': /* Byte offset from a symbol */
1483 pp->offset = strtoul(arg, &tmp, 0);
1484 if (*tmp != '\0') {
1485 semantic_error("There is non-digit character"
1486 " in offset.\n");
1487 return -EINVAL;
1488 }
1489 break;
1490 case '@': /* File name */
1491 if (pp->file) {
1492 semantic_error("SRC@SRC is not allowed.\n");
1493 return -EINVAL;
1494 }
1495 pp->file = strdup_esc(arg);
1496 if (pp->file == NULL)
1497 return -ENOMEM;
1498 break;
1499 case '%': /* Probe places */
1500 if (strcmp(arg, "return") == 0) {
1501 pp->retprobe = 1;
1502 } else { /* Others not supported yet */
1503 semantic_error("%%%s is not supported.\n", arg);
1504 return -ENOTSUP;
1505 }
1506 break;
1507 default: /* Buggy case */
1508 pr_err("This program has a bug at %s:%d.\n",
1509 __FILE__, __LINE__);
1510 return -ENOTSUP;
1511 break;
1512 }
1513 }
1514
1515 /* Exclusion check */
1516 if (pp->lazy_line && pp->line) {
1517 semantic_error("Lazy pattern can't be used with"
1518 " line number.\n");
1519 return -EINVAL;
1520 }
1521
1522 if (pp->lazy_line && pp->offset) {
1523 semantic_error("Lazy pattern can't be used with offset.\n");
1524 return -EINVAL;
1525 }
1526
1527 if (pp->line && pp->offset) {
1528 semantic_error("Offset can't be used with line number.\n");
1529 return -EINVAL;
1530 }
1531
1532 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1533 semantic_error("File always requires line number or "
1534 "lazy pattern.\n");
1535 return -EINVAL;
1536 }
1537
1538 if (pp->offset && !pp->function) {
1539 semantic_error("Offset requires an entry function.\n");
1540 return -EINVAL;
1541 }
1542
1543 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1544 semantic_error("Offset/Line/Lazy pattern can't be used with "
1545 "return probe.\n");
1546 return -EINVAL;
1547 }
1548
1549 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1550 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1551 pp->lazy_line);
1552 return 0;
1553 }
1554
1555 /* Parse perf-probe event argument */
1556 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1557 {
1558 char *tmp, *goodname;
1559 struct perf_probe_arg_field **fieldp;
1560
1561 pr_debug("parsing arg: %s into ", str);
1562
1563 tmp = strchr(str, '=');
1564 if (tmp) {
1565 arg->name = strndup(str, tmp - str);
1566 if (arg->name == NULL)
1567 return -ENOMEM;
1568 pr_debug("name:%s ", arg->name);
1569 str = tmp + 1;
1570 }
1571
1572 tmp = strchr(str, ':');
1573 if (tmp) { /* Type setting */
1574 *tmp = '\0';
1575 arg->type = strdup(tmp + 1);
1576 if (arg->type == NULL)
1577 return -ENOMEM;
1578 pr_debug("type:%s ", arg->type);
1579 }
1580
1581 tmp = strpbrk(str, "-.[");
1582 if (!is_c_varname(str) || !tmp) {
1583 /* A variable, register, symbol or special value */
1584 arg->var = strdup(str);
1585 if (arg->var == NULL)
1586 return -ENOMEM;
1587 pr_debug("%s\n", arg->var);
1588 return 0;
1589 }
1590
1591 /* Structure fields or array element */
1592 arg->var = strndup(str, tmp - str);
1593 if (arg->var == NULL)
1594 return -ENOMEM;
1595 goodname = arg->var;
1596 pr_debug("%s, ", arg->var);
1597 fieldp = &arg->field;
1598
1599 do {
1600 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1601 if (*fieldp == NULL)
1602 return -ENOMEM;
1603 if (*tmp == '[') { /* Array */
1604 str = tmp;
1605 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1606 (*fieldp)->ref = true;
1607 if (*tmp != ']' || tmp == str + 1) {
1608 semantic_error("Array index must be a"
1609 " number.\n");
1610 return -EINVAL;
1611 }
1612 tmp++;
1613 if (*tmp == '\0')
1614 tmp = NULL;
1615 } else { /* Structure */
1616 if (*tmp == '.') {
1617 str = tmp + 1;
1618 (*fieldp)->ref = false;
1619 } else if (tmp[1] == '>') {
1620 str = tmp + 2;
1621 (*fieldp)->ref = true;
1622 } else {
1623 semantic_error("Argument parse error: %s\n",
1624 str);
1625 return -EINVAL;
1626 }
1627 tmp = strpbrk(str, "-.[");
1628 }
1629 if (tmp) {
1630 (*fieldp)->name = strndup(str, tmp - str);
1631 if ((*fieldp)->name == NULL)
1632 return -ENOMEM;
1633 if (*str != '[')
1634 goodname = (*fieldp)->name;
1635 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1636 fieldp = &(*fieldp)->next;
1637 }
1638 } while (tmp);
1639 (*fieldp)->name = strdup(str);
1640 if ((*fieldp)->name == NULL)
1641 return -ENOMEM;
1642 if (*str != '[')
1643 goodname = (*fieldp)->name;
1644 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1645
1646 /* If no name is specified, set the last field name (not array index)*/
1647 if (!arg->name) {
1648 arg->name = strdup(goodname);
1649 if (arg->name == NULL)
1650 return -ENOMEM;
1651 }
1652 return 0;
1653 }
1654
1655 /* Parse perf-probe event command */
1656 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1657 {
1658 char **argv;
1659 int argc, i, ret = 0;
1660
1661 argv = argv_split(cmd, &argc);
1662 if (!argv) {
1663 pr_debug("Failed to split arguments.\n");
1664 return -ENOMEM;
1665 }
1666 if (argc - 1 > MAX_PROBE_ARGS) {
1667 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1668 ret = -ERANGE;
1669 goto out;
1670 }
1671 /* Parse probe point */
1672 ret = parse_perf_probe_point(argv[0], pev);
1673 if (ret < 0)
1674 goto out;
1675
1676 /* Copy arguments and ensure return probe has no C argument */
1677 pev->nargs = argc - 1;
1678 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1679 if (pev->args == NULL) {
1680 ret = -ENOMEM;
1681 goto out;
1682 }
1683 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1684 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1685 if (ret >= 0 &&
1686 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1687 semantic_error("You can't specify local variable for"
1688 " kretprobe.\n");
1689 ret = -EINVAL;
1690 }
1691 }
1692 out:
1693 argv_free(argv);
1694
1695 return ret;
1696 }
1697
1698 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1699 bool perf_probe_with_var(struct perf_probe_event *pev)
1700 {
1701 int i = 0;
1702
1703 for (i = 0; i < pev->nargs; i++)
1704 if (is_c_varname(pev->args[i].var) ||
1705 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1706 !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1707 return true;
1708 return false;
1709 }
1710
1711 /* Return true if this perf_probe_event requires debuginfo */
1712 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1713 {
1714 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1715 return true;
1716
1717 if (perf_probe_with_var(pev))
1718 return true;
1719
1720 return false;
1721 }
1722
1723 /* Parse probe_events event into struct probe_point */
1724 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1725 {
1726 struct probe_trace_point *tp = &tev->point;
1727 char pr;
1728 char *p;
1729 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1730 int ret, i, argc;
1731 char **argv;
1732
1733 pr_debug("Parsing probe_events: %s\n", cmd);
1734 argv = argv_split(cmd, &argc);
1735 if (!argv) {
1736 pr_debug("Failed to split arguments.\n");
1737 return -ENOMEM;
1738 }
1739 if (argc < 2) {
1740 semantic_error("Too few probe arguments.\n");
1741 ret = -ERANGE;
1742 goto out;
1743 }
1744
1745 /* Scan event and group name. */
1746 argv0_str = strdup(argv[0]);
1747 if (argv0_str == NULL) {
1748 ret = -ENOMEM;
1749 goto out;
1750 }
1751 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1752 fmt2_str = strtok_r(NULL, "/", &fmt);
1753 fmt3_str = strtok_r(NULL, " \t", &fmt);
1754 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1755 || fmt3_str == NULL) {
1756 semantic_error("Failed to parse event name: %s\n", argv[0]);
1757 ret = -EINVAL;
1758 goto out;
1759 }
1760 pr = fmt1_str[0];
1761 tev->group = strdup(fmt2_str);
1762 tev->event = strdup(fmt3_str);
1763 if (tev->group == NULL || tev->event == NULL) {
1764 ret = -ENOMEM;
1765 goto out;
1766 }
1767 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1768
1769 tp->retprobe = (pr == 'r');
1770
1771 /* Scan module name(if there), function name and offset */
1772 p = strchr(argv[1], ':');
1773 if (p) {
1774 tp->module = strndup(argv[1], p - argv[1]);
1775 if (!tp->module) {
1776 ret = -ENOMEM;
1777 goto out;
1778 }
1779 tev->uprobes = (tp->module[0] == '/');
1780 p++;
1781 } else
1782 p = argv[1];
1783 fmt1_str = strtok_r(p, "+", &fmt);
1784 /* only the address started with 0x */
1785 if (fmt1_str[0] == '0') {
1786 /*
1787 * Fix a special case:
1788 * if address == 0, kernel reports something like:
1789 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1790 * Newer kernel may fix that, but we want to
1791 * support old kernel also.
1792 */
1793 if (strcmp(fmt1_str, "0x") == 0) {
1794 if (!argv[2] || strcmp(argv[2], "(null)")) {
1795 ret = -EINVAL;
1796 goto out;
1797 }
1798 tp->address = 0;
1799
1800 free(argv[2]);
1801 for (i = 2; argv[i + 1] != NULL; i++)
1802 argv[i] = argv[i + 1];
1803
1804 argv[i] = NULL;
1805 argc -= 1;
1806 } else
1807 tp->address = strtoul(fmt1_str, NULL, 0);
1808 } else {
1809 /* Only the symbol-based probe has offset */
1810 tp->symbol = strdup(fmt1_str);
1811 if (tp->symbol == NULL) {
1812 ret = -ENOMEM;
1813 goto out;
1814 }
1815 fmt2_str = strtok_r(NULL, "", &fmt);
1816 if (fmt2_str == NULL)
1817 tp->offset = 0;
1818 else
1819 tp->offset = strtoul(fmt2_str, NULL, 10);
1820 }
1821
1822 tev->nargs = argc - 2;
1823 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1824 if (tev->args == NULL) {
1825 ret = -ENOMEM;
1826 goto out;
1827 }
1828 for (i = 0; i < tev->nargs; i++) {
1829 p = strchr(argv[i + 2], '=');
1830 if (p) /* We don't need which register is assigned. */
1831 *p++ = '\0';
1832 else
1833 p = argv[i + 2];
1834 tev->args[i].name = strdup(argv[i + 2]);
1835 /* TODO: parse regs and offset */
1836 tev->args[i].value = strdup(p);
1837 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1838 ret = -ENOMEM;
1839 goto out;
1840 }
1841 }
1842 ret = 0;
1843 out:
1844 free(argv0_str);
1845 argv_free(argv);
1846 return ret;
1847 }
1848
1849 /* Compose only probe arg */
1850 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1851 {
1852 struct perf_probe_arg_field *field = pa->field;
1853 struct strbuf buf;
1854 char *ret = NULL;
1855 int err;
1856
1857 if (strbuf_init(&buf, 64) < 0)
1858 return NULL;
1859
1860 if (pa->name && pa->var)
1861 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1862 else
1863 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1864 if (err)
1865 goto out;
1866
1867 while (field) {
1868 if (field->name[0] == '[')
1869 err = strbuf_addstr(&buf, field->name);
1870 else
1871 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1872 field->name);
1873 field = field->next;
1874 if (err)
1875 goto out;
1876 }
1877
1878 if (pa->type)
1879 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1880 goto out;
1881
1882 ret = strbuf_detach(&buf, NULL);
1883 out:
1884 strbuf_release(&buf);
1885 return ret;
1886 }
1887
1888 /* Compose only probe point (not argument) */
1889 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1890 {
1891 struct strbuf buf;
1892 char *tmp, *ret = NULL;
1893 int len, err = 0;
1894
1895 if (strbuf_init(&buf, 64) < 0)
1896 return NULL;
1897
1898 if (pp->function) {
1899 if (strbuf_addstr(&buf, pp->function) < 0)
1900 goto out;
1901 if (pp->offset)
1902 err = strbuf_addf(&buf, "+%lu", pp->offset);
1903 else if (pp->line)
1904 err = strbuf_addf(&buf, ":%d", pp->line);
1905 else if (pp->retprobe)
1906 err = strbuf_addstr(&buf, "%return");
1907 if (err)
1908 goto out;
1909 }
1910 if (pp->file) {
1911 tmp = pp->file;
1912 len = strlen(tmp);
1913 if (len > 30) {
1914 tmp = strchr(pp->file + len - 30, '/');
1915 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1916 }
1917 err = strbuf_addf(&buf, "@%s", tmp);
1918 if (!err && !pp->function && pp->line)
1919 err = strbuf_addf(&buf, ":%d", pp->line);
1920 }
1921 if (!err)
1922 ret = strbuf_detach(&buf, NULL);
1923 out:
1924 strbuf_release(&buf);
1925 return ret;
1926 }
1927
1928 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1929 {
1930 struct strbuf buf;
1931 char *tmp, *ret = NULL;
1932 int i;
1933
1934 if (strbuf_init(&buf, 64))
1935 return NULL;
1936 if (pev->event)
1937 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1938 pev->event) < 0)
1939 goto out;
1940
1941 tmp = synthesize_perf_probe_point(&pev->point);
1942 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1943 goto out;
1944 free(tmp);
1945
1946 for (i = 0; i < pev->nargs; i++) {
1947 tmp = synthesize_perf_probe_arg(pev->args + i);
1948 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1949 goto out;
1950 free(tmp);
1951 }
1952
1953 ret = strbuf_detach(&buf, NULL);
1954 out:
1955 strbuf_release(&buf);
1956 return ret;
1957 }
1958
1959 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1960 struct strbuf *buf, int depth)
1961 {
1962 int err;
1963 if (ref->next) {
1964 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1965 depth + 1);
1966 if (depth < 0)
1967 return depth;
1968 }
1969 err = strbuf_addf(buf, "%+ld(", ref->offset);
1970 return (err < 0) ? err : depth;
1971 }
1972
1973 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1974 struct strbuf *buf)
1975 {
1976 struct probe_trace_arg_ref *ref = arg->ref;
1977 int depth = 0, err;
1978
1979 /* Argument name or separator */
1980 if (arg->name)
1981 err = strbuf_addf(buf, " %s=", arg->name);
1982 else
1983 err = strbuf_addch(buf, ' ');
1984 if (err)
1985 return err;
1986
1987 /* Special case: @XXX */
1988 if (arg->value[0] == '@' && arg->ref)
1989 ref = ref->next;
1990
1991 /* Dereferencing arguments */
1992 if (ref) {
1993 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1994 if (depth < 0)
1995 return depth;
1996 }
1997
1998 /* Print argument value */
1999 if (arg->value[0] == '@' && arg->ref)
2000 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2001 else
2002 err = strbuf_addstr(buf, arg->value);
2003
2004 /* Closing */
2005 while (!err && depth--)
2006 err = strbuf_addch(buf, ')');
2007
2008 /* Print argument type */
2009 if (!err && arg->type)
2010 err = strbuf_addf(buf, ":%s", arg->type);
2011
2012 return err;
2013 }
2014
2015 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2016 {
2017 struct probe_trace_point *tp = &tev->point;
2018 struct strbuf buf;
2019 char *ret = NULL;
2020 int i, err;
2021
2022 /* Uprobes must have tp->module */
2023 if (tev->uprobes && !tp->module)
2024 return NULL;
2025
2026 if (strbuf_init(&buf, 32) < 0)
2027 return NULL;
2028
2029 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2030 tev->group, tev->event) < 0)
2031 goto error;
2032 /*
2033 * If tp->address == 0, then this point must be a
2034 * absolute address uprobe.
2035 * try_to_find_absolute_address() should have made
2036 * tp->symbol to "0x0".
2037 */
2038 if (tev->uprobes && !tp->address) {
2039 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2040 goto error;
2041 }
2042
2043 /* Use the tp->address for uprobes */
2044 if (tev->uprobes)
2045 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
2046 else if (!strncmp(tp->symbol, "0x", 2))
2047 /* Absolute address. See try_to_find_absolute_address() */
2048 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2049 tp->module ? ":" : "", tp->address);
2050 else
2051 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2052 tp->module ? ":" : "", tp->symbol, tp->offset);
2053 if (err)
2054 goto error;
2055
2056 for (i = 0; i < tev->nargs; i++)
2057 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
2058 goto error;
2059
2060 ret = strbuf_detach(&buf, NULL);
2061 error:
2062 strbuf_release(&buf);
2063 return ret;
2064 }
2065
2066 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2067 struct perf_probe_point *pp,
2068 bool is_kprobe)
2069 {
2070 struct symbol *sym = NULL;
2071 struct map *map = NULL;
2072 u64 addr = tp->address;
2073 int ret = -ENOENT;
2074
2075 if (!is_kprobe) {
2076 map = dso__new_map(tp->module);
2077 if (!map)
2078 goto out;
2079 sym = map__find_symbol(map, addr);
2080 } else {
2081 if (tp->symbol && !addr) {
2082 if (kernel_get_symbol_address_by_name(tp->symbol,
2083 &addr, true, false) < 0)
2084 goto out;
2085 }
2086 if (addr) {
2087 addr += tp->offset;
2088 sym = machine__find_kernel_symbol(host_machine, addr, &map);
2089 }
2090 }
2091
2092 if (!sym)
2093 goto out;
2094
2095 pp->retprobe = tp->retprobe;
2096 pp->offset = addr - map->unmap_ip(map, sym->start);
2097 pp->function = strdup(sym->name);
2098 ret = pp->function ? 0 : -ENOMEM;
2099
2100 out:
2101 if (map && !is_kprobe) {
2102 map__put(map);
2103 }
2104
2105 return ret;
2106 }
2107
2108 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2109 struct perf_probe_point *pp,
2110 bool is_kprobe)
2111 {
2112 char buf[128];
2113 int ret;
2114
2115 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2116 if (!ret)
2117 return 0;
2118 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2119 if (!ret)
2120 return 0;
2121
2122 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2123
2124 if (tp->symbol) {
2125 pp->function = strdup(tp->symbol);
2126 pp->offset = tp->offset;
2127 } else {
2128 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2129 if (ret < 0)
2130 return ret;
2131 pp->function = strdup(buf);
2132 pp->offset = 0;
2133 }
2134 if (pp->function == NULL)
2135 return -ENOMEM;
2136
2137 pp->retprobe = tp->retprobe;
2138
2139 return 0;
2140 }
2141
2142 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2143 struct perf_probe_event *pev, bool is_kprobe)
2144 {
2145 struct strbuf buf = STRBUF_INIT;
2146 int i, ret;
2147
2148 /* Convert event/group name */
2149 pev->event = strdup(tev->event);
2150 pev->group = strdup(tev->group);
2151 if (pev->event == NULL || pev->group == NULL)
2152 return -ENOMEM;
2153
2154 /* Convert trace_point to probe_point */
2155 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2156 if (ret < 0)
2157 return ret;
2158
2159 /* Convert trace_arg to probe_arg */
2160 pev->nargs = tev->nargs;
2161 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2162 if (pev->args == NULL)
2163 return -ENOMEM;
2164 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2165 if (tev->args[i].name)
2166 pev->args[i].name = strdup(tev->args[i].name);
2167 else {
2168 if ((ret = strbuf_init(&buf, 32)) < 0)
2169 goto error;
2170 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2171 pev->args[i].name = strbuf_detach(&buf, NULL);
2172 }
2173 if (pev->args[i].name == NULL && ret >= 0)
2174 ret = -ENOMEM;
2175 }
2176 error:
2177 if (ret < 0)
2178 clear_perf_probe_event(pev);
2179
2180 return ret;
2181 }
2182
2183 void clear_perf_probe_event(struct perf_probe_event *pev)
2184 {
2185 struct perf_probe_arg_field *field, *next;
2186 int i;
2187
2188 free(pev->event);
2189 free(pev->group);
2190 free(pev->target);
2191 clear_perf_probe_point(&pev->point);
2192
2193 for (i = 0; i < pev->nargs; i++) {
2194 free(pev->args[i].name);
2195 free(pev->args[i].var);
2196 free(pev->args[i].type);
2197 field = pev->args[i].field;
2198 while (field) {
2199 next = field->next;
2200 zfree(&field->name);
2201 free(field);
2202 field = next;
2203 }
2204 }
2205 free(pev->args);
2206 memset(pev, 0, sizeof(*pev));
2207 }
2208
2209 #define strdup_or_goto(str, label) \
2210 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2211
2212 static int perf_probe_point__copy(struct perf_probe_point *dst,
2213 struct perf_probe_point *src)
2214 {
2215 dst->file = strdup_or_goto(src->file, out_err);
2216 dst->function = strdup_or_goto(src->function, out_err);
2217 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2218 dst->line = src->line;
2219 dst->retprobe = src->retprobe;
2220 dst->offset = src->offset;
2221 return 0;
2222
2223 out_err:
2224 clear_perf_probe_point(dst);
2225 return -ENOMEM;
2226 }
2227
2228 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2229 struct perf_probe_arg *src)
2230 {
2231 struct perf_probe_arg_field *field, **ppfield;
2232
2233 dst->name = strdup_or_goto(src->name, out_err);
2234 dst->var = strdup_or_goto(src->var, out_err);
2235 dst->type = strdup_or_goto(src->type, out_err);
2236
2237 field = src->field;
2238 ppfield = &(dst->field);
2239 while (field) {
2240 *ppfield = zalloc(sizeof(*field));
2241 if (!*ppfield)
2242 goto out_err;
2243 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2244 (*ppfield)->index = field->index;
2245 (*ppfield)->ref = field->ref;
2246 field = field->next;
2247 ppfield = &((*ppfield)->next);
2248 }
2249 return 0;
2250 out_err:
2251 return -ENOMEM;
2252 }
2253
2254 int perf_probe_event__copy(struct perf_probe_event *dst,
2255 struct perf_probe_event *src)
2256 {
2257 int i;
2258
2259 dst->event = strdup_or_goto(src->event, out_err);
2260 dst->group = strdup_or_goto(src->group, out_err);
2261 dst->target = strdup_or_goto(src->target, out_err);
2262 dst->uprobes = src->uprobes;
2263
2264 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2265 goto out_err;
2266
2267 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2268 if (!dst->args)
2269 goto out_err;
2270 dst->nargs = src->nargs;
2271
2272 for (i = 0; i < src->nargs; i++)
2273 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2274 goto out_err;
2275 return 0;
2276
2277 out_err:
2278 clear_perf_probe_event(dst);
2279 return -ENOMEM;
2280 }
2281
2282 void clear_probe_trace_event(struct probe_trace_event *tev)
2283 {
2284 struct probe_trace_arg_ref *ref, *next;
2285 int i;
2286
2287 free(tev->event);
2288 free(tev->group);
2289 free(tev->point.symbol);
2290 free(tev->point.realname);
2291 free(tev->point.module);
2292 for (i = 0; i < tev->nargs; i++) {
2293 free(tev->args[i].name);
2294 free(tev->args[i].value);
2295 free(tev->args[i].type);
2296 ref = tev->args[i].ref;
2297 while (ref) {
2298 next = ref->next;
2299 free(ref);
2300 ref = next;
2301 }
2302 }
2303 free(tev->args);
2304 memset(tev, 0, sizeof(*tev));
2305 }
2306
2307 struct kprobe_blacklist_node {
2308 struct list_head list;
2309 unsigned long start;
2310 unsigned long end;
2311 char *symbol;
2312 };
2313
2314 static void kprobe_blacklist__delete(struct list_head *blacklist)
2315 {
2316 struct kprobe_blacklist_node *node;
2317
2318 while (!list_empty(blacklist)) {
2319 node = list_first_entry(blacklist,
2320 struct kprobe_blacklist_node, list);
2321 list_del(&node->list);
2322 free(node->symbol);
2323 free(node);
2324 }
2325 }
2326
2327 static int kprobe_blacklist__load(struct list_head *blacklist)
2328 {
2329 struct kprobe_blacklist_node *node;
2330 const char *__debugfs = debugfs__mountpoint();
2331 char buf[PATH_MAX], *p;
2332 FILE *fp;
2333 int ret;
2334
2335 if (__debugfs == NULL)
2336 return -ENOTSUP;
2337
2338 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2339 if (ret < 0)
2340 return ret;
2341
2342 fp = fopen(buf, "r");
2343 if (!fp)
2344 return -errno;
2345
2346 ret = 0;
2347 while (fgets(buf, PATH_MAX, fp)) {
2348 node = zalloc(sizeof(*node));
2349 if (!node) {
2350 ret = -ENOMEM;
2351 break;
2352 }
2353 INIT_LIST_HEAD(&node->list);
2354 list_add_tail(&node->list, blacklist);
2355 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2356 ret = -EINVAL;
2357 break;
2358 }
2359 p = strchr(buf, '\t');
2360 if (p) {
2361 p++;
2362 if (p[strlen(p) - 1] == '\n')
2363 p[strlen(p) - 1] = '\0';
2364 } else
2365 p = (char *)"unknown";
2366 node->symbol = strdup(p);
2367 if (!node->symbol) {
2368 ret = -ENOMEM;
2369 break;
2370 }
2371 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2372 node->start, node->end, node->symbol);
2373 ret++;
2374 }
2375 if (ret < 0)
2376 kprobe_blacklist__delete(blacklist);
2377 fclose(fp);
2378
2379 return ret;
2380 }
2381
2382 static struct kprobe_blacklist_node *
2383 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2384 unsigned long address)
2385 {
2386 struct kprobe_blacklist_node *node;
2387
2388 list_for_each_entry(node, blacklist, list) {
2389 if (node->start <= address && address < node->end)
2390 return node;
2391 }
2392
2393 return NULL;
2394 }
2395
2396 static LIST_HEAD(kprobe_blacklist);
2397
2398 static void kprobe_blacklist__init(void)
2399 {
2400 if (!list_empty(&kprobe_blacklist))
2401 return;
2402
2403 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2404 pr_debug("No kprobe blacklist support, ignored\n");
2405 }
2406
2407 static void kprobe_blacklist__release(void)
2408 {
2409 kprobe_blacklist__delete(&kprobe_blacklist);
2410 }
2411
2412 static bool kprobe_blacklist__listed(unsigned long address)
2413 {
2414 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2415 }
2416
2417 static int perf_probe_event__sprintf(const char *group, const char *event,
2418 struct perf_probe_event *pev,
2419 const char *module,
2420 struct strbuf *result)
2421 {
2422 int i, ret;
2423 char *buf;
2424
2425 if (asprintf(&buf, "%s:%s", group, event) < 0)
2426 return -errno;
2427 ret = strbuf_addf(result, " %-20s (on ", buf);
2428 free(buf);
2429 if (ret)
2430 return ret;
2431
2432 /* Synthesize only event probe point */
2433 buf = synthesize_perf_probe_point(&pev->point);
2434 if (!buf)
2435 return -ENOMEM;
2436 ret = strbuf_addstr(result, buf);
2437 free(buf);
2438
2439 if (!ret && module)
2440 ret = strbuf_addf(result, " in %s", module);
2441
2442 if (!ret && pev->nargs > 0) {
2443 ret = strbuf_add(result, " with", 5);
2444 for (i = 0; !ret && i < pev->nargs; i++) {
2445 buf = synthesize_perf_probe_arg(&pev->args[i]);
2446 if (!buf)
2447 return -ENOMEM;
2448 ret = strbuf_addf(result, " %s", buf);
2449 free(buf);
2450 }
2451 }
2452 if (!ret)
2453 ret = strbuf_addch(result, ')');
2454
2455 return ret;
2456 }
2457
2458 /* Show an event */
2459 int show_perf_probe_event(const char *group, const char *event,
2460 struct perf_probe_event *pev,
2461 const char *module, bool use_stdout)
2462 {
2463 struct strbuf buf = STRBUF_INIT;
2464 int ret;
2465
2466 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2467 if (ret >= 0) {
2468 if (use_stdout)
2469 printf("%s\n", buf.buf);
2470 else
2471 pr_info("%s\n", buf.buf);
2472 }
2473 strbuf_release(&buf);
2474
2475 return ret;
2476 }
2477
2478 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2479 struct strfilter *filter)
2480 {
2481 char tmp[128];
2482
2483 /* At first, check the event name itself */
2484 if (strfilter__compare(filter, tev->event))
2485 return true;
2486
2487 /* Next, check the combination of name and group */
2488 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2489 return false;
2490 return strfilter__compare(filter, tmp);
2491 }
2492
2493 static int __show_perf_probe_events(int fd, bool is_kprobe,
2494 struct strfilter *filter)
2495 {
2496 int ret = 0;
2497 struct probe_trace_event tev;
2498 struct perf_probe_event pev;
2499 struct strlist *rawlist;
2500 struct str_node *ent;
2501
2502 memset(&tev, 0, sizeof(tev));
2503 memset(&pev, 0, sizeof(pev));
2504
2505 rawlist = probe_file__get_rawlist(fd);
2506 if (!rawlist)
2507 return -ENOMEM;
2508
2509 strlist__for_each_entry(ent, rawlist) {
2510 ret = parse_probe_trace_command(ent->s, &tev);
2511 if (ret >= 0) {
2512 if (!filter_probe_trace_event(&tev, filter))
2513 goto next;
2514 ret = convert_to_perf_probe_event(&tev, &pev,
2515 is_kprobe);
2516 if (ret < 0)
2517 goto next;
2518 ret = show_perf_probe_event(pev.group, pev.event,
2519 &pev, tev.point.module,
2520 true);
2521 }
2522 next:
2523 clear_perf_probe_event(&pev);
2524 clear_probe_trace_event(&tev);
2525 if (ret < 0)
2526 break;
2527 }
2528 strlist__delete(rawlist);
2529 /* Cleanup cached debuginfo if needed */
2530 debuginfo_cache__exit();
2531
2532 return ret;
2533 }
2534
2535 /* List up current perf-probe events */
2536 int show_perf_probe_events(struct strfilter *filter)
2537 {
2538 int kp_fd, up_fd, ret;
2539
2540 setup_pager();
2541
2542 if (probe_conf.cache)
2543 return probe_cache__show_all_caches(filter);
2544
2545 ret = init_probe_symbol_maps(false);
2546 if (ret < 0)
2547 return ret;
2548
2549 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2550 if (ret < 0)
2551 return ret;
2552
2553 if (kp_fd >= 0)
2554 ret = __show_perf_probe_events(kp_fd, true, filter);
2555 if (up_fd >= 0 && ret >= 0)
2556 ret = __show_perf_probe_events(up_fd, false, filter);
2557 if (kp_fd > 0)
2558 close(kp_fd);
2559 if (up_fd > 0)
2560 close(up_fd);
2561 exit_probe_symbol_maps();
2562
2563 return ret;
2564 }
2565
2566 static int get_new_event_name(char *buf, size_t len, const char *base,
2567 struct strlist *namelist, bool ret_event,
2568 bool allow_suffix)
2569 {
2570 int i, ret;
2571 char *p, *nbase;
2572
2573 if (*base == '.')
2574 base++;
2575 nbase = strdup(base);
2576 if (!nbase)
2577 return -ENOMEM;
2578
2579 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2580 p = strpbrk(nbase, ".@");
2581 if (p && p != nbase)
2582 *p = '\0';
2583
2584 /* Try no suffix number */
2585 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2586 if (ret < 0) {
2587 pr_debug("snprintf() failed: %d\n", ret);
2588 goto out;
2589 }
2590 if (!strlist__has_entry(namelist, buf))
2591 goto out;
2592
2593 if (!allow_suffix) {
2594 pr_warning("Error: event \"%s\" already exists.\n"
2595 " Hint: Remove existing event by 'perf probe -d'\n"
2596 " or force duplicates by 'perf probe -f'\n"
2597 " or set 'force=yes' in BPF source.\n",
2598 buf);
2599 ret = -EEXIST;
2600 goto out;
2601 }
2602
2603 /* Try to add suffix */
2604 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2605 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2606 if (ret < 0) {
2607 pr_debug("snprintf() failed: %d\n", ret);
2608 goto out;
2609 }
2610 if (!strlist__has_entry(namelist, buf))
2611 break;
2612 }
2613 if (i == MAX_EVENT_INDEX) {
2614 pr_warning("Too many events are on the same function.\n");
2615 ret = -ERANGE;
2616 }
2617
2618 out:
2619 free(nbase);
2620
2621 /* Final validation */
2622 if (ret >= 0 && !is_c_func_name(buf)) {
2623 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2624 buf);
2625 ret = -EINVAL;
2626 }
2627
2628 return ret;
2629 }
2630
2631 /* Warn if the current kernel's uprobe implementation is old */
2632 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2633 {
2634 int i;
2635 char *buf = synthesize_probe_trace_command(tev);
2636
2637 /* Old uprobe event doesn't support memory dereference */
2638 if (!tev->uprobes || tev->nargs == 0 || !buf)
2639 goto out;
2640
2641 for (i = 0; i < tev->nargs; i++)
2642 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2643 pr_warning("Please upgrade your kernel to at least "
2644 "3.14 to have access to feature %s\n",
2645 tev->args[i].value);
2646 break;
2647 }
2648 out:
2649 free(buf);
2650 }
2651
2652 /* Set new name from original perf_probe_event and namelist */
2653 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2654 struct perf_probe_event *pev,
2655 struct strlist *namelist,
2656 bool allow_suffix)
2657 {
2658 const char *event, *group;
2659 char buf[64];
2660 int ret;
2661
2662 /* If probe_event or trace_event already have the name, reuse it */
2663 if (pev->event && !pev->sdt)
2664 event = pev->event;
2665 else if (tev->event)
2666 event = tev->event;
2667 else {
2668 /* Or generate new one from probe point */
2669 if (pev->point.function &&
2670 (strncmp(pev->point.function, "0x", 2) != 0) &&
2671 !strisglob(pev->point.function))
2672 event = pev->point.function;
2673 else
2674 event = tev->point.realname;
2675 }
2676 if (pev->group && !pev->sdt)
2677 group = pev->group;
2678 else if (tev->group)
2679 group = tev->group;
2680 else
2681 group = PERFPROBE_GROUP;
2682
2683 /* Get an unused new event name */
2684 ret = get_new_event_name(buf, 64, event, namelist,
2685 tev->point.retprobe, allow_suffix);
2686 if (ret < 0)
2687 return ret;
2688
2689 event = buf;
2690
2691 tev->event = strdup(event);
2692 tev->group = strdup(group);
2693 if (tev->event == NULL || tev->group == NULL)
2694 return -ENOMEM;
2695
2696 /* Add added event name to namelist */
2697 strlist__add(namelist, event);
2698 return 0;
2699 }
2700
2701 static int __open_probe_file_and_namelist(bool uprobe,
2702 struct strlist **namelist)
2703 {
2704 int fd;
2705
2706 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2707 if (fd < 0)
2708 return fd;
2709
2710 /* Get current event names */
2711 *namelist = probe_file__get_namelist(fd);
2712 if (!(*namelist)) {
2713 pr_debug("Failed to get current event list.\n");
2714 close(fd);
2715 return -ENOMEM;
2716 }
2717 return fd;
2718 }
2719
2720 static int __add_probe_trace_events(struct perf_probe_event *pev,
2721 struct probe_trace_event *tevs,
2722 int ntevs, bool allow_suffix)
2723 {
2724 int i, fd[2] = {-1, -1}, up, ret;
2725 struct probe_trace_event *tev = NULL;
2726 struct probe_cache *cache = NULL;
2727 struct strlist *namelist[2] = {NULL, NULL};
2728 struct nscookie nsc;
2729
2730 up = pev->uprobes ? 1 : 0;
2731 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2732 if (fd[up] < 0)
2733 return fd[up];
2734
2735 ret = 0;
2736 for (i = 0; i < ntevs; i++) {
2737 tev = &tevs[i];
2738 up = tev->uprobes ? 1 : 0;
2739 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2740 fd[up] = __open_probe_file_and_namelist(up,
2741 &namelist[up]);
2742 if (fd[up] < 0)
2743 goto close_out;
2744 }
2745 /* Skip if the symbol is out of .text or blacklisted */
2746 if (!tev->point.symbol && !pev->uprobes)
2747 continue;
2748
2749 /* Set new name for tev (and update namelist) */
2750 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2751 allow_suffix);
2752 if (ret < 0)
2753 break;
2754
2755 nsinfo__mountns_enter(pev->nsi, &nsc);
2756 ret = probe_file__add_event(fd[up], tev);
2757 nsinfo__mountns_exit(&nsc);
2758 if (ret < 0)
2759 break;
2760
2761 /*
2762 * Probes after the first probe which comes from same
2763 * user input are always allowed to add suffix, because
2764 * there might be several addresses corresponding to
2765 * one code line.
2766 */
2767 allow_suffix = true;
2768 }
2769 if (ret == -EINVAL && pev->uprobes)
2770 warn_uprobe_event_compat(tev);
2771 if (ret == 0 && probe_conf.cache) {
2772 cache = probe_cache__new(pev->target, pev->nsi);
2773 if (!cache ||
2774 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2775 probe_cache__commit(cache) < 0)
2776 pr_warning("Failed to add event to probe cache\n");
2777 probe_cache__delete(cache);
2778 }
2779
2780 close_out:
2781 for (up = 0; up < 2; up++) {
2782 strlist__delete(namelist[up]);
2783 if (fd[up] >= 0)
2784 close(fd[up]);
2785 }
2786 return ret;
2787 }
2788
2789 static int find_probe_functions(struct map *map, char *name,
2790 struct symbol **syms)
2791 {
2792 int found = 0;
2793 struct symbol *sym;
2794 struct rb_node *tmp;
2795 const char *norm, *ver;
2796 char *buf = NULL;
2797 bool cut_version = true;
2798
2799 if (map__load(map) < 0)
2800 return 0;
2801
2802 /* If user gives a version, don't cut off the version from symbols */
2803 if (strchr(name, '@'))
2804 cut_version = false;
2805
2806 map__for_each_symbol(map, sym, tmp) {
2807 norm = arch__normalize_symbol_name(sym->name);
2808 if (!norm)
2809 continue;
2810
2811 if (cut_version) {
2812 /* We don't care about default symbol or not */
2813 ver = strchr(norm, '@');
2814 if (ver) {
2815 buf = strndup(norm, ver - norm);
2816 if (!buf)
2817 return -ENOMEM;
2818 norm = buf;
2819 }
2820 }
2821
2822 if (strglobmatch(norm, name)) {
2823 found++;
2824 if (syms && found < probe_conf.max_probes)
2825 syms[found - 1] = sym;
2826 }
2827 if (buf)
2828 zfree(&buf);
2829 }
2830
2831 return found;
2832 }
2833
2834 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2835 struct probe_trace_event *tev __maybe_unused,
2836 struct map *map __maybe_unused,
2837 struct symbol *sym __maybe_unused) { }
2838
2839 /*
2840 * Find probe function addresses from map.
2841 * Return an error or the number of found probe_trace_event
2842 */
2843 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2844 struct probe_trace_event **tevs)
2845 {
2846 struct map *map = NULL;
2847 struct ref_reloc_sym *reloc_sym = NULL;
2848 struct symbol *sym;
2849 struct symbol **syms = NULL;
2850 struct probe_trace_event *tev;
2851 struct perf_probe_point *pp = &pev->point;
2852 struct probe_trace_point *tp;
2853 int num_matched_functions;
2854 int ret, i, j, skipped = 0;
2855 char *mod_name;
2856
2857 map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2858 if (!map) {
2859 ret = -EINVAL;
2860 goto out;
2861 }
2862
2863 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2864 if (!syms) {
2865 ret = -ENOMEM;
2866 goto out;
2867 }
2868
2869 /*
2870 * Load matched symbols: Since the different local symbols may have
2871 * same name but different addresses, this lists all the symbols.
2872 */
2873 num_matched_functions = find_probe_functions(map, pp->function, syms);
2874 if (num_matched_functions <= 0) {
2875 pr_err("Failed to find symbol %s in %s\n", pp->function,
2876 pev->target ? : "kernel");
2877 ret = -ENOENT;
2878 goto out;
2879 } else if (num_matched_functions > probe_conf.max_probes) {
2880 pr_err("Too many functions matched in %s\n",
2881 pev->target ? : "kernel");
2882 ret = -E2BIG;
2883 goto out;
2884 }
2885
2886 /* Note that the symbols in the kmodule are not relocated */
2887 if (!pev->uprobes && !pev->target &&
2888 (!pp->retprobe || kretprobe_offset_is_supported())) {
2889 reloc_sym = kernel_get_ref_reloc_sym();
2890 if (!reloc_sym) {
2891 pr_warning("Relocated base symbol is not found!\n");
2892 ret = -EINVAL;
2893 goto out;
2894 }
2895 }
2896
2897 /* Setup result trace-probe-events */
2898 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2899 if (!*tevs) {
2900 ret = -ENOMEM;
2901 goto out;
2902 }
2903
2904 ret = 0;
2905
2906 for (j = 0; j < num_matched_functions; j++) {
2907 sym = syms[j];
2908
2909 tev = (*tevs) + ret;
2910 tp = &tev->point;
2911 if (ret == num_matched_functions) {
2912 pr_warning("Too many symbols are listed. Skip it.\n");
2913 break;
2914 }
2915 ret++;
2916
2917 if (pp->offset > sym->end - sym->start) {
2918 pr_warning("Offset %ld is bigger than the size of %s\n",
2919 pp->offset, sym->name);
2920 ret = -ENOENT;
2921 goto err_out;
2922 }
2923 /* Add one probe point */
2924 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2925
2926 /* Check the kprobe (not in module) is within .text */
2927 if (!pev->uprobes && !pev->target &&
2928 kprobe_warn_out_range(sym->name, tp->address)) {
2929 tp->symbol = NULL; /* Skip it */
2930 skipped++;
2931 } else if (reloc_sym) {
2932 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2933 tp->offset = tp->address - reloc_sym->addr;
2934 } else {
2935 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2936 tp->offset = pp->offset;
2937 }
2938 tp->realname = strdup_or_goto(sym->name, nomem_out);
2939
2940 tp->retprobe = pp->retprobe;
2941 if (pev->target) {
2942 if (pev->uprobes) {
2943 tev->point.module = strdup_or_goto(pev->target,
2944 nomem_out);
2945 } else {
2946 mod_name = find_module_name(pev->target);
2947 tev->point.module =
2948 strdup(mod_name ? mod_name : pev->target);
2949 free(mod_name);
2950 if (!tev->point.module)
2951 goto nomem_out;
2952 }
2953 }
2954 tev->uprobes = pev->uprobes;
2955 tev->nargs = pev->nargs;
2956 if (tev->nargs) {
2957 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2958 tev->nargs);
2959 if (tev->args == NULL)
2960 goto nomem_out;
2961 }
2962 for (i = 0; i < tev->nargs; i++) {
2963 if (pev->args[i].name)
2964 tev->args[i].name =
2965 strdup_or_goto(pev->args[i].name,
2966 nomem_out);
2967
2968 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2969 nomem_out);
2970 if (pev->args[i].type)
2971 tev->args[i].type =
2972 strdup_or_goto(pev->args[i].type,
2973 nomem_out);
2974 }
2975 arch__fix_tev_from_maps(pev, tev, map, sym);
2976 }
2977 if (ret == skipped) {
2978 ret = -ENOENT;
2979 goto err_out;
2980 }
2981
2982 out:
2983 map__put(map);
2984 free(syms);
2985 return ret;
2986
2987 nomem_out:
2988 ret = -ENOMEM;
2989 err_out:
2990 clear_probe_trace_events(*tevs, num_matched_functions);
2991 zfree(tevs);
2992 goto out;
2993 }
2994
2995 static int try_to_find_absolute_address(struct perf_probe_event *pev,
2996 struct probe_trace_event **tevs)
2997 {
2998 struct perf_probe_point *pp = &pev->point;
2999 struct probe_trace_event *tev;
3000 struct probe_trace_point *tp;
3001 int i, err;
3002
3003 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3004 return -EINVAL;
3005 if (perf_probe_event_need_dwarf(pev))
3006 return -EINVAL;
3007
3008 /*
3009 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3010 * absolute address.
3011 *
3012 * Only one tev can be generated by this.
3013 */
3014 *tevs = zalloc(sizeof(*tev));
3015 if (!*tevs)
3016 return -ENOMEM;
3017
3018 tev = *tevs;
3019 tp = &tev->point;
3020
3021 /*
3022 * Don't use tp->offset, use address directly, because
3023 * in synthesize_probe_trace_command() address cannot be
3024 * zero.
3025 */
3026 tp->address = pev->point.abs_address;
3027 tp->retprobe = pp->retprobe;
3028 tev->uprobes = pev->uprobes;
3029
3030 err = -ENOMEM;
3031 /*
3032 * Give it a '0x' leading symbol name.
3033 * In __add_probe_trace_events, a NULL symbol is interpreted as
3034 * invalud.
3035 */
3036 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3037 goto errout;
3038
3039 /* For kprobe, check range */
3040 if ((!tev->uprobes) &&
3041 (kprobe_warn_out_range(tev->point.symbol,
3042 tev->point.address))) {
3043 err = -EACCES;
3044 goto errout;
3045 }
3046
3047 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3048 goto errout;
3049
3050 if (pev->target) {
3051 tp->module = strdup(pev->target);
3052 if (!tp->module)
3053 goto errout;
3054 }
3055
3056 if (tev->group) {
3057 tev->group = strdup(pev->group);
3058 if (!tev->group)
3059 goto errout;
3060 }
3061
3062 if (pev->event) {
3063 tev->event = strdup(pev->event);
3064 if (!tev->event)
3065 goto errout;
3066 }
3067
3068 tev->nargs = pev->nargs;
3069 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3070 if (!tev->args)
3071 goto errout;
3072
3073 for (i = 0; i < tev->nargs; i++)
3074 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3075
3076 return 1;
3077
3078 errout:
3079 clear_probe_trace_events(*tevs, 1);
3080 *tevs = NULL;
3081 return err;
3082 }
3083
3084 /* Concatinate two arrays */
3085 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3086 {
3087 void *ret;
3088
3089 ret = malloc(sz_a + sz_b);
3090 if (ret) {
3091 memcpy(ret, a, sz_a);
3092 memcpy(ret + sz_a, b, sz_b);
3093 }
3094 return ret;
3095 }
3096
3097 static int
3098 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3099 struct probe_trace_event **tevs2, int ntevs2)
3100 {
3101 struct probe_trace_event *new_tevs;
3102 int ret = 0;
3103
3104 if (*ntevs == 0) {
3105 *tevs = *tevs2;
3106 *ntevs = ntevs2;
3107 *tevs2 = NULL;
3108 return 0;
3109 }
3110
3111 if (*ntevs + ntevs2 > probe_conf.max_probes)
3112 ret = -E2BIG;
3113 else {
3114 /* Concatinate the array of probe_trace_event */
3115 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3116 *tevs2, ntevs2 * sizeof(**tevs2));
3117 if (!new_tevs)
3118 ret = -ENOMEM;
3119 else {
3120 free(*tevs);
3121 *tevs = new_tevs;
3122 *ntevs += ntevs2;
3123 }
3124 }
3125 if (ret < 0)
3126 clear_probe_trace_events(*tevs2, ntevs2);
3127 zfree(tevs2);
3128
3129 return ret;
3130 }
3131
3132 /*
3133 * Try to find probe_trace_event from given probe caches. Return the number
3134 * of cached events found, if an error occurs return the error.
3135 */
3136 static int find_cached_events(struct perf_probe_event *pev,
3137 struct probe_trace_event **tevs,
3138 const char *target)
3139 {
3140 struct probe_cache *cache;
3141 struct probe_cache_entry *entry;
3142 struct probe_trace_event *tmp_tevs = NULL;
3143 int ntevs = 0;
3144 int ret = 0;
3145
3146 cache = probe_cache__new(target, pev->nsi);
3147 /* Return 0 ("not found") if the target has no probe cache. */
3148 if (!cache)
3149 return 0;
3150
3151 for_each_probe_cache_entry(entry, cache) {
3152 /* Skip the cache entry which has no name */
3153 if (!entry->pev.event || !entry->pev.group)
3154 continue;
3155 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3156 strglobmatch(entry->pev.event, pev->event)) {
3157 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3158 if (ret > 0)
3159 ret = concat_probe_trace_events(tevs, &ntevs,
3160 &tmp_tevs, ret);
3161 if (ret < 0)
3162 break;
3163 }
3164 }
3165 probe_cache__delete(cache);
3166 if (ret < 0) {
3167 clear_probe_trace_events(*tevs, ntevs);
3168 zfree(tevs);
3169 } else {
3170 ret = ntevs;
3171 if (ntevs > 0 && target && target[0] == '/')
3172 pev->uprobes = true;
3173 }
3174
3175 return ret;
3176 }
3177
3178 /* Try to find probe_trace_event from all probe caches */
3179 static int find_cached_events_all(struct perf_probe_event *pev,
3180 struct probe_trace_event **tevs)
3181 {
3182 struct probe_trace_event *tmp_tevs = NULL;
3183 struct strlist *bidlist;
3184 struct str_node *nd;
3185 char *pathname;
3186 int ntevs = 0;
3187 int ret;
3188
3189 /* Get the buildid list of all valid caches */
3190 bidlist = build_id_cache__list_all(true);
3191 if (!bidlist) {
3192 ret = -errno;
3193 pr_debug("Failed to get buildids: %d\n", ret);
3194 return ret;
3195 }
3196
3197 ret = 0;
3198 strlist__for_each_entry(nd, bidlist) {
3199 pathname = build_id_cache__origname(nd->s);
3200 ret = find_cached_events(pev, &tmp_tevs, pathname);
3201 /* In the case of cnt == 0, we just skip it */
3202 if (ret > 0)
3203 ret = concat_probe_trace_events(tevs, &ntevs,
3204 &tmp_tevs, ret);
3205 free(pathname);
3206 if (ret < 0)
3207 break;
3208 }
3209 strlist__delete(bidlist);
3210
3211 if (ret < 0) {
3212 clear_probe_trace_events(*tevs, ntevs);
3213 zfree(tevs);
3214 } else
3215 ret = ntevs;
3216
3217 return ret;
3218 }
3219
3220 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3221 struct probe_trace_event **tevs)
3222 {
3223 struct probe_cache *cache;
3224 struct probe_cache_entry *entry;
3225 struct probe_trace_event *tev;
3226 struct str_node *node;
3227 int ret, i;
3228
3229 if (pev->sdt) {
3230 /* For SDT/cached events, we use special search functions */
3231 if (!pev->target)
3232 return find_cached_events_all(pev, tevs);
3233 else
3234 return find_cached_events(pev, tevs, pev->target);
3235 }
3236 cache = probe_cache__new(pev->target, pev->nsi);
3237 if (!cache)
3238 return 0;
3239
3240 entry = probe_cache__find(cache, pev);
3241 if (!entry) {
3242 /* SDT must be in the cache */
3243 ret = pev->sdt ? -ENOENT : 0;
3244 goto out;
3245 }
3246
3247 ret = strlist__nr_entries(entry->tevlist);
3248 if (ret > probe_conf.max_probes) {
3249 pr_debug("Too many entries matched in the cache of %s\n",
3250 pev->target ? : "kernel");
3251 ret = -E2BIG;
3252 goto out;
3253 }
3254
3255 *tevs = zalloc(ret * sizeof(*tev));
3256 if (!*tevs) {
3257 ret = -ENOMEM;
3258 goto out;
3259 }
3260
3261 i = 0;
3262 strlist__for_each_entry(node, entry->tevlist) {
3263 tev = &(*tevs)[i++];
3264 ret = parse_probe_trace_command(node->s, tev);
3265 if (ret < 0)
3266 goto out;
3267 /* Set the uprobes attribute as same as original */
3268 tev->uprobes = pev->uprobes;
3269 }
3270 ret = i;
3271
3272 out:
3273 probe_cache__delete(cache);
3274 return ret;
3275 }
3276
3277 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3278 struct probe_trace_event **tevs)
3279 {
3280 int ret;
3281
3282 if (!pev->group && !pev->sdt) {
3283 /* Set group name if not given */
3284 if (!pev->uprobes) {
3285 pev->group = strdup(PERFPROBE_GROUP);
3286 ret = pev->group ? 0 : -ENOMEM;
3287 } else
3288 ret = convert_exec_to_group(pev->target, &pev->group);
3289 if (ret != 0) {
3290 pr_warning("Failed to make a group name.\n");
3291 return ret;
3292 }
3293 }
3294
3295 ret = try_to_find_absolute_address(pev, tevs);
3296 if (ret > 0)
3297 return ret;
3298
3299 /* At first, we need to lookup cache entry */
3300 ret = find_probe_trace_events_from_cache(pev, tevs);
3301 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3302 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3303
3304 /* Convert perf_probe_event with debuginfo */
3305 ret = try_to_find_probe_trace_events(pev, tevs);
3306 if (ret != 0)
3307 return ret; /* Found in debuginfo or got an error */
3308
3309 return find_probe_trace_events_from_map(pev, tevs);
3310 }
3311
3312 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3313 {
3314 int i, ret;
3315
3316 /* Loop 1: convert all events */
3317 for (i = 0; i < npevs; i++) {
3318 /* Init kprobe blacklist if needed */
3319 if (!pevs[i].uprobes)
3320 kprobe_blacklist__init();
3321 /* Convert with or without debuginfo */
3322 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3323 if (ret < 0)
3324 return ret;
3325 pevs[i].ntevs = ret;
3326 }
3327 /* This just release blacklist only if allocated */
3328 kprobe_blacklist__release();
3329
3330 return 0;
3331 }
3332
3333 static int show_probe_trace_event(struct probe_trace_event *tev)
3334 {
3335 char *buf = synthesize_probe_trace_command(tev);
3336
3337 if (!buf) {
3338 pr_debug("Failed to synthesize probe trace event.\n");
3339 return -EINVAL;
3340 }
3341
3342 /* Showing definition always go stdout */
3343 printf("%s\n", buf);
3344 free(buf);
3345
3346 return 0;
3347 }
3348
3349 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3350 {
3351 struct strlist *namelist = strlist__new(NULL, NULL);
3352 struct probe_trace_event *tev;
3353 struct perf_probe_event *pev;
3354 int i, j, ret = 0;
3355
3356 if (!namelist)
3357 return -ENOMEM;
3358
3359 for (j = 0; j < npevs && !ret; j++) {
3360 pev = &pevs[j];
3361 for (i = 0; i < pev->ntevs && !ret; i++) {
3362 tev = &pev->tevs[i];
3363 /* Skip if the symbol is out of .text or blacklisted */
3364 if (!tev->point.symbol && !pev->uprobes)
3365 continue;
3366
3367 /* Set new name for tev (and update namelist) */
3368 ret = probe_trace_event__set_name(tev, pev,
3369 namelist, true);
3370 if (!ret)
3371 ret = show_probe_trace_event(tev);
3372 }
3373 }
3374 strlist__delete(namelist);
3375
3376 return ret;
3377 }
3378
3379 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3380 {
3381 int i, ret = 0;
3382
3383 /* Loop 2: add all events */
3384 for (i = 0; i < npevs; i++) {
3385 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3386 pevs[i].ntevs,
3387 probe_conf.force_add);
3388 if (ret < 0)
3389 break;
3390 }
3391 return ret;
3392 }
3393
3394 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3395 {
3396 int i, j;
3397 struct perf_probe_event *pev;
3398
3399 /* Loop 3: cleanup and free trace events */
3400 for (i = 0; i < npevs; i++) {
3401 pev = &pevs[i];
3402 for (j = 0; j < pevs[i].ntevs; j++)
3403 clear_probe_trace_event(&pevs[i].tevs[j]);
3404 zfree(&pevs[i].tevs);
3405 pevs[i].ntevs = 0;
3406 nsinfo__zput(pev->nsi);
3407 clear_perf_probe_event(&pevs[i]);
3408 }
3409 }
3410
3411 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3412 {
3413 int ret;
3414
3415 ret = init_probe_symbol_maps(pevs->uprobes);
3416 if (ret < 0)
3417 return ret;
3418
3419 ret = convert_perf_probe_events(pevs, npevs);
3420 if (ret == 0)
3421 ret = apply_perf_probe_events(pevs, npevs);
3422
3423 cleanup_perf_probe_events(pevs, npevs);
3424
3425 exit_probe_symbol_maps();
3426 return ret;
3427 }
3428
3429 int del_perf_probe_events(struct strfilter *filter)
3430 {
3431 int ret, ret2, ufd = -1, kfd = -1;
3432 char *str = strfilter__string(filter);
3433
3434 if (!str)
3435 return -EINVAL;
3436
3437 /* Get current event names */
3438 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3439 if (ret < 0)
3440 goto out;
3441
3442 ret = probe_file__del_events(kfd, filter);
3443 if (ret < 0 && ret != -ENOENT)
3444 goto error;
3445
3446 ret2 = probe_file__del_events(ufd, filter);
3447 if (ret2 < 0 && ret2 != -ENOENT) {
3448 ret = ret2;
3449 goto error;
3450 }
3451 ret = 0;
3452
3453 error:
3454 if (kfd >= 0)
3455 close(kfd);
3456 if (ufd >= 0)
3457 close(ufd);
3458 out:
3459 free(str);
3460
3461 return ret;
3462 }
3463
3464 int show_available_funcs(const char *target, struct nsinfo *nsi,
3465 struct strfilter *_filter, bool user)
3466 {
3467 struct rb_node *nd;
3468 struct map *map;
3469 int ret;
3470
3471 ret = init_probe_symbol_maps(user);
3472 if (ret < 0)
3473 return ret;
3474
3475 /* Get a symbol map */
3476 map = get_target_map(target, nsi, user);
3477 if (!map) {
3478 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3479 return -EINVAL;
3480 }
3481
3482 ret = map__load(map);
3483 if (ret) {
3484 if (ret == -2) {
3485 char *str = strfilter__string(_filter);
3486 pr_err("Failed to find symbols matched to \"%s\"\n",
3487 str);
3488 free(str);
3489 } else
3490 pr_err("Failed to load symbols in %s\n",
3491 (target) ? : "kernel");
3492 goto end;
3493 }
3494 if (!dso__sorted_by_name(map->dso))
3495 dso__sort_by_name(map->dso);
3496
3497 /* Show all (filtered) symbols */
3498 setup_pager();
3499
3500 for (nd = rb_first(&map->dso->symbol_names); nd; nd = rb_next(nd)) {
3501 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3502
3503 if (strfilter__compare(_filter, pos->sym.name))
3504 printf("%s\n", pos->sym.name);
3505 }
3506 end:
3507 map__put(map);
3508 exit_probe_symbol_maps();
3509
3510 return ret;
3511 }
3512
3513 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3514 struct perf_probe_arg *pvar)
3515 {
3516 tvar->value = strdup(pvar->var);
3517 if (tvar->value == NULL)
3518 return -ENOMEM;
3519 if (pvar->type) {
3520 tvar->type = strdup(pvar->type);
3521 if (tvar->type == NULL)
3522 return -ENOMEM;
3523 }
3524 if (pvar->name) {
3525 tvar->name = strdup(pvar->name);
3526 if (tvar->name == NULL)
3527 return -ENOMEM;
3528 } else
3529 tvar->name = NULL;
3530 return 0;
3531 }
Linux with added FPC-III support