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perf probe: Use cache entry if possible
[deliverable/linux.git] / tools / perf / util / probe-event.c
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 <sys/utsname.h>
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <fcntl.h>
26 #include <errno.h>
27 #include <stdio.h>
28 #include <unistd.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <stdarg.h>
32 #include <limits.h>
33 #include <elf.h>
34
35 #include "util.h"
36 #include "event.h"
37 #include "strlist.h"
38 #include "debug.h"
39 #include "cache.h"
40 #include "color.h"
41 #include "symbol.h"
42 #include "thread.h"
43 #include <api/fs/fs.h>
44 #include "trace-event.h" /* For __maybe_unused */
45 #include "probe-event.h"
46 #include "probe-finder.h"
47 #include "probe-file.h"
48 #include "session.h"
49
50 #define MAX_CMDLEN 256
51 #define PERFPROBE_GROUP "probe"
52
53 bool probe_event_dry_run; /* Dry run flag */
54 struct probe_conf probe_conf;
55
56 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
57
58 int e_snprintf(char *str, size_t size, const char *format, ...)
59 {
60 int ret;
61 va_list ap;
62 va_start(ap, format);
63 ret = vsnprintf(str, size, format, ap);
64 va_end(ap);
65 if (ret >= (int)size)
66 ret = -E2BIG;
67 return ret;
68 }
69
70 static struct machine *host_machine;
71
72 /* Initialize symbol maps and path of vmlinux/modules */
73 int init_probe_symbol_maps(bool user_only)
74 {
75 int ret;
76
77 symbol_conf.sort_by_name = true;
78 symbol_conf.allow_aliases = true;
79 ret = symbol__init(NULL);
80 if (ret < 0) {
81 pr_debug("Failed to init symbol map.\n");
82 goto out;
83 }
84
85 if (host_machine || user_only) /* already initialized */
86 return 0;
87
88 if (symbol_conf.vmlinux_name)
89 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
90
91 host_machine = machine__new_host();
92 if (!host_machine) {
93 pr_debug("machine__new_host() failed.\n");
94 symbol__exit();
95 ret = -1;
96 }
97 out:
98 if (ret < 0)
99 pr_warning("Failed to init vmlinux path.\n");
100 return ret;
101 }
102
103 void exit_probe_symbol_maps(void)
104 {
105 machine__delete(host_machine);
106 host_machine = NULL;
107 symbol__exit();
108 }
109
110 static struct symbol *__find_kernel_function_by_name(const char *name,
111 struct map **mapp)
112 {
113 return machine__find_kernel_function_by_name(host_machine, name, mapp,
114 NULL);
115 }
116
117 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
118 {
119 return machine__find_kernel_function(host_machine, addr, mapp, NULL);
120 }
121
122 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
123 {
124 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
125 struct kmap *kmap;
126 struct map *map = machine__kernel_map(host_machine);
127
128 if (map__load(map, NULL) < 0)
129 return NULL;
130
131 kmap = map__kmap(map);
132 if (!kmap)
133 return NULL;
134 return kmap->ref_reloc_sym;
135 }
136
137 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
138 bool reloc, bool reladdr)
139 {
140 struct ref_reloc_sym *reloc_sym;
141 struct symbol *sym;
142 struct map *map;
143
144 /* ref_reloc_sym is just a label. Need a special fix*/
145 reloc_sym = kernel_get_ref_reloc_sym();
146 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
147 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
148 else {
149 sym = __find_kernel_function_by_name(name, &map);
150 if (!sym)
151 return -ENOENT;
152 *addr = map->unmap_ip(map, sym->start) -
153 ((reloc) ? 0 : map->reloc) -
154 ((reladdr) ? map->start : 0);
155 }
156 return 0;
157 }
158
159 static struct map *kernel_get_module_map(const char *module)
160 {
161 struct map_groups *grp = &host_machine->kmaps;
162 struct maps *maps = &grp->maps[MAP__FUNCTION];
163 struct map *pos;
164
165 /* A file path -- this is an offline module */
166 if (module && strchr(module, '/'))
167 return machine__findnew_module_map(host_machine, 0, module);
168
169 if (!module)
170 module = "kernel";
171
172 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
173 if (strncmp(pos->dso->short_name + 1, module,
174 pos->dso->short_name_len - 2) == 0) {
175 return pos;
176 }
177 }
178 return NULL;
179 }
180
181 static struct map *get_target_map(const char *target, bool user)
182 {
183 /* Init maps of given executable or kernel */
184 if (user)
185 return dso__new_map(target);
186 else
187 return kernel_get_module_map(target);
188 }
189
190 static void put_target_map(struct map *map, bool user)
191 {
192 if (map && user) {
193 /* Only the user map needs to be released */
194 map__put(map);
195 }
196 }
197
198
199 static int convert_exec_to_group(const char *exec, char **result)
200 {
201 char *ptr1, *ptr2, *exec_copy;
202 char buf[64];
203 int ret;
204
205 exec_copy = strdup(exec);
206 if (!exec_copy)
207 return -ENOMEM;
208
209 ptr1 = basename(exec_copy);
210 if (!ptr1) {
211 ret = -EINVAL;
212 goto out;
213 }
214
215 ptr2 = strpbrk(ptr1, "-._");
216 if (ptr2)
217 *ptr2 = '\0';
218 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
219 if (ret < 0)
220 goto out;
221
222 *result = strdup(buf);
223 ret = *result ? 0 : -ENOMEM;
224
225 out:
226 free(exec_copy);
227 return ret;
228 }
229
230 static void clear_perf_probe_point(struct perf_probe_point *pp)
231 {
232 free(pp->file);
233 free(pp->function);
234 free(pp->lazy_line);
235 }
236
237 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
238 {
239 int i;
240
241 for (i = 0; i < ntevs; i++)
242 clear_probe_trace_event(tevs + i);
243 }
244
245 static bool kprobe_blacklist__listed(unsigned long address);
246 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
247 {
248 u64 etext_addr = 0;
249 int ret;
250
251 /* Get the address of _etext for checking non-probable text symbol */
252 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
253 false, false);
254
255 if (ret == 0 && etext_addr < address)
256 pr_warning("%s is out of .text, skip it.\n", symbol);
257 else if (kprobe_blacklist__listed(address))
258 pr_warning("%s is blacklisted function, skip it.\n", symbol);
259 else
260 return false;
261
262 return true;
263 }
264
265 /*
266 * NOTE:
267 * '.gnu.linkonce.this_module' section of kernel module elf directly
268 * maps to 'struct module' from linux/module.h. This section contains
269 * actual module name which will be used by kernel after loading it.
270 * But, we cannot use 'struct module' here since linux/module.h is not
271 * exposed to user-space. Offset of 'name' has remained same from long
272 * time, so hardcoding it here.
273 */
274 #ifdef __LP64__
275 #define MOD_NAME_OFFSET 24
276 #else
277 #define MOD_NAME_OFFSET 12
278 #endif
279
280 /*
281 * @module can be module name of module file path. In case of path,
282 * inspect elf and find out what is actual module name.
283 * Caller has to free mod_name after using it.
284 */
285 static char *find_module_name(const char *module)
286 {
287 int fd;
288 Elf *elf;
289 GElf_Ehdr ehdr;
290 GElf_Shdr shdr;
291 Elf_Data *data;
292 Elf_Scn *sec;
293 char *mod_name = NULL;
294
295 fd = open(module, O_RDONLY);
296 if (fd < 0)
297 return NULL;
298
299 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
300 if (elf == NULL)
301 goto elf_err;
302
303 if (gelf_getehdr(elf, &ehdr) == NULL)
304 goto ret_err;
305
306 sec = elf_section_by_name(elf, &ehdr, &shdr,
307 ".gnu.linkonce.this_module", NULL);
308 if (!sec)
309 goto ret_err;
310
311 data = elf_getdata(sec, NULL);
312 if (!data || !data->d_buf)
313 goto ret_err;
314
315 mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET);
316
317 ret_err:
318 elf_end(elf);
319 elf_err:
320 close(fd);
321 return mod_name;
322 }
323
324 #ifdef HAVE_DWARF_SUPPORT
325
326 static int kernel_get_module_dso(const char *module, struct dso **pdso)
327 {
328 struct dso *dso;
329 struct map *map;
330 const char *vmlinux_name;
331 int ret = 0;
332
333 if (module) {
334 char module_name[128];
335
336 snprintf(module_name, sizeof(module_name), "[%s]", module);
337 map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name);
338 if (map) {
339 dso = map->dso;
340 goto found;
341 }
342 pr_debug("Failed to find module %s.\n", module);
343 return -ENOENT;
344 }
345
346 map = machine__kernel_map(host_machine);
347 dso = map->dso;
348
349 vmlinux_name = symbol_conf.vmlinux_name;
350 dso->load_errno = 0;
351 if (vmlinux_name)
352 ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
353 else
354 ret = dso__load_vmlinux_path(dso, map, NULL);
355 found:
356 *pdso = dso;
357 return ret;
358 }
359
360 /*
361 * Some binaries like glibc have special symbols which are on the symbol
362 * table, but not in the debuginfo. If we can find the address of the
363 * symbol from map, we can translate the address back to the probe point.
364 */
365 static int find_alternative_probe_point(struct debuginfo *dinfo,
366 struct perf_probe_point *pp,
367 struct perf_probe_point *result,
368 const char *target, bool uprobes)
369 {
370 struct map *map = NULL;
371 struct symbol *sym;
372 u64 address = 0;
373 int ret = -ENOENT;
374
375 /* This can work only for function-name based one */
376 if (!pp->function || pp->file)
377 return -ENOTSUP;
378
379 map = get_target_map(target, uprobes);
380 if (!map)
381 return -EINVAL;
382
383 /* Find the address of given function */
384 map__for_each_symbol_by_name(map, pp->function, sym) {
385 if (uprobes)
386 address = sym->start;
387 else
388 address = map->unmap_ip(map, sym->start);
389 break;
390 }
391 if (!address) {
392 ret = -ENOENT;
393 goto out;
394 }
395 pr_debug("Symbol %s address found : %" PRIx64 "\n",
396 pp->function, address);
397
398 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
399 result);
400 if (ret <= 0)
401 ret = (!ret) ? -ENOENT : ret;
402 else {
403 result->offset += pp->offset;
404 result->line += pp->line;
405 result->retprobe = pp->retprobe;
406 ret = 0;
407 }
408
409 out:
410 put_target_map(map, uprobes);
411 return ret;
412
413 }
414
415 static int get_alternative_probe_event(struct debuginfo *dinfo,
416 struct perf_probe_event *pev,
417 struct perf_probe_point *tmp)
418 {
419 int ret;
420
421 memcpy(tmp, &pev->point, sizeof(*tmp));
422 memset(&pev->point, 0, sizeof(pev->point));
423 ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
424 pev->target, pev->uprobes);
425 if (ret < 0)
426 memcpy(&pev->point, tmp, sizeof(*tmp));
427
428 return ret;
429 }
430
431 static int get_alternative_line_range(struct debuginfo *dinfo,
432 struct line_range *lr,
433 const char *target, bool user)
434 {
435 struct perf_probe_point pp = { .function = lr->function,
436 .file = lr->file,
437 .line = lr->start };
438 struct perf_probe_point result;
439 int ret, len = 0;
440
441 memset(&result, 0, sizeof(result));
442
443 if (lr->end != INT_MAX)
444 len = lr->end - lr->start;
445 ret = find_alternative_probe_point(dinfo, &pp, &result,
446 target, user);
447 if (!ret) {
448 lr->function = result.function;
449 lr->file = result.file;
450 lr->start = result.line;
451 if (lr->end != INT_MAX)
452 lr->end = lr->start + len;
453 clear_perf_probe_point(&pp);
454 }
455 return ret;
456 }
457
458 /* Open new debuginfo of given module */
459 static struct debuginfo *open_debuginfo(const char *module, bool silent)
460 {
461 const char *path = module;
462 char reason[STRERR_BUFSIZE];
463 struct debuginfo *ret = NULL;
464 struct dso *dso = NULL;
465 int err;
466
467 if (!module || !strchr(module, '/')) {
468 err = kernel_get_module_dso(module, &dso);
469 if (err < 0) {
470 if (!dso || dso->load_errno == 0) {
471 if (!strerror_r(-err, reason, STRERR_BUFSIZE))
472 strcpy(reason, "(unknown)");
473 } else
474 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
475 if (!silent)
476 pr_err("Failed to find the path for %s: %s\n",
477 module ?: "kernel", reason);
478 return NULL;
479 }
480 path = dso->long_name;
481 }
482 ret = debuginfo__new(path);
483 if (!ret && !silent) {
484 pr_warning("The %s file has no debug information.\n", path);
485 if (!module || !strtailcmp(path, ".ko"))
486 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
487 else
488 pr_warning("Rebuild with -g, ");
489 pr_warning("or install an appropriate debuginfo package.\n");
490 }
491 return ret;
492 }
493
494 /* For caching the last debuginfo */
495 static struct debuginfo *debuginfo_cache;
496 static char *debuginfo_cache_path;
497
498 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
499 {
500 const char *path = module;
501
502 /* If the module is NULL, it should be the kernel. */
503 if (!module)
504 path = "kernel";
505
506 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
507 goto out;
508
509 /* Copy module path */
510 free(debuginfo_cache_path);
511 debuginfo_cache_path = strdup(path);
512 if (!debuginfo_cache_path) {
513 debuginfo__delete(debuginfo_cache);
514 debuginfo_cache = NULL;
515 goto out;
516 }
517
518 debuginfo_cache = open_debuginfo(module, silent);
519 if (!debuginfo_cache)
520 zfree(&debuginfo_cache_path);
521 out:
522 return debuginfo_cache;
523 }
524
525 static void debuginfo_cache__exit(void)
526 {
527 debuginfo__delete(debuginfo_cache);
528 debuginfo_cache = NULL;
529 zfree(&debuginfo_cache_path);
530 }
531
532
533 static int get_text_start_address(const char *exec, unsigned long *address)
534 {
535 Elf *elf;
536 GElf_Ehdr ehdr;
537 GElf_Shdr shdr;
538 int fd, ret = -ENOENT;
539
540 fd = open(exec, O_RDONLY);
541 if (fd < 0)
542 return -errno;
543
544 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
545 if (elf == NULL) {
546 ret = -EINVAL;
547 goto out_close;
548 }
549
550 if (gelf_getehdr(elf, &ehdr) == NULL)
551 goto out;
552
553 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
554 goto out;
555
556 *address = shdr.sh_addr - shdr.sh_offset;
557 ret = 0;
558 out:
559 elf_end(elf);
560 out_close:
561 close(fd);
562
563 return ret;
564 }
565
566 /*
567 * Convert trace point to probe point with debuginfo
568 */
569 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
570 struct perf_probe_point *pp,
571 bool is_kprobe)
572 {
573 struct debuginfo *dinfo = NULL;
574 unsigned long stext = 0;
575 u64 addr = tp->address;
576 int ret = -ENOENT;
577
578 /* convert the address to dwarf address */
579 if (!is_kprobe) {
580 if (!addr) {
581 ret = -EINVAL;
582 goto error;
583 }
584 ret = get_text_start_address(tp->module, &stext);
585 if (ret < 0)
586 goto error;
587 addr += stext;
588 } else if (tp->symbol) {
589 /* If the module is given, this returns relative address */
590 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
591 false, !!tp->module);
592 if (ret != 0)
593 goto error;
594 addr += tp->offset;
595 }
596
597 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
598 tp->module ? : "kernel");
599
600 dinfo = debuginfo_cache__open(tp->module, verbose == 0);
601 if (dinfo)
602 ret = debuginfo__find_probe_point(dinfo,
603 (unsigned long)addr, pp);
604 else
605 ret = -ENOENT;
606
607 if (ret > 0) {
608 pp->retprobe = tp->retprobe;
609 return 0;
610 }
611 error:
612 pr_debug("Failed to find corresponding probes from debuginfo.\n");
613 return ret ? : -ENOENT;
614 }
615
616 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
617 int ntevs, const char *exec)
618 {
619 int i, ret = 0;
620 unsigned long stext = 0;
621
622 if (!exec)
623 return 0;
624
625 ret = get_text_start_address(exec, &stext);
626 if (ret < 0)
627 return ret;
628
629 for (i = 0; i < ntevs && ret >= 0; i++) {
630 /* point.address is the addres of point.symbol + point.offset */
631 tevs[i].point.address -= stext;
632 tevs[i].point.module = strdup(exec);
633 if (!tevs[i].point.module) {
634 ret = -ENOMEM;
635 break;
636 }
637 tevs[i].uprobes = true;
638 }
639
640 return ret;
641 }
642
643 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
644 int ntevs, const char *module)
645 {
646 int i, ret = 0;
647 char *mod_name = NULL;
648
649 if (!module)
650 return 0;
651
652 mod_name = find_module_name(module);
653
654 for (i = 0; i < ntevs; i++) {
655 tevs[i].point.module =
656 strdup(mod_name ? mod_name : module);
657 if (!tevs[i].point.module) {
658 ret = -ENOMEM;
659 break;
660 }
661 }
662
663 free(mod_name);
664 return ret;
665 }
666
667 /* Post processing the probe events */
668 static int post_process_probe_trace_events(struct probe_trace_event *tevs,
669 int ntevs, const char *module,
670 bool uprobe)
671 {
672 struct ref_reloc_sym *reloc_sym;
673 char *tmp;
674 int i, skipped = 0;
675
676 if (uprobe)
677 return add_exec_to_probe_trace_events(tevs, ntevs, module);
678
679 /* Note that currently ref_reloc_sym based probe is not for drivers */
680 if (module)
681 return add_module_to_probe_trace_events(tevs, ntevs, module);
682
683 reloc_sym = kernel_get_ref_reloc_sym();
684 if (!reloc_sym) {
685 pr_warning("Relocated base symbol is not found!\n");
686 return -EINVAL;
687 }
688
689 for (i = 0; i < ntevs; i++) {
690 if (!tevs[i].point.address || tevs[i].point.retprobe)
691 continue;
692 /* If we found a wrong one, mark it by NULL symbol */
693 if (kprobe_warn_out_range(tevs[i].point.symbol,
694 tevs[i].point.address)) {
695 tmp = NULL;
696 skipped++;
697 } else {
698 tmp = strdup(reloc_sym->name);
699 if (!tmp)
700 return -ENOMEM;
701 }
702 /* If we have no realname, use symbol for it */
703 if (!tevs[i].point.realname)
704 tevs[i].point.realname = tevs[i].point.symbol;
705 else
706 free(tevs[i].point.symbol);
707 tevs[i].point.symbol = tmp;
708 tevs[i].point.offset = tevs[i].point.address -
709 reloc_sym->unrelocated_addr;
710 }
711 return skipped;
712 }
713
714 /* Try to find perf_probe_event with debuginfo */
715 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
716 struct probe_trace_event **tevs)
717 {
718 bool need_dwarf = perf_probe_event_need_dwarf(pev);
719 struct perf_probe_point tmp;
720 struct debuginfo *dinfo;
721 int ntevs, ret = 0;
722
723 dinfo = open_debuginfo(pev->target, !need_dwarf);
724 if (!dinfo) {
725 if (need_dwarf)
726 return -ENOENT;
727 pr_debug("Could not open debuginfo. Try to use symbols.\n");
728 return 0;
729 }
730
731 pr_debug("Try to find probe point from debuginfo.\n");
732 /* Searching trace events corresponding to a probe event */
733 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
734
735 if (ntevs == 0) { /* Not found, retry with an alternative */
736 ret = get_alternative_probe_event(dinfo, pev, &tmp);
737 if (!ret) {
738 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
739 /*
740 * Write back to the original probe_event for
741 * setting appropriate (user given) event name
742 */
743 clear_perf_probe_point(&pev->point);
744 memcpy(&pev->point, &tmp, sizeof(tmp));
745 }
746 }
747
748 debuginfo__delete(dinfo);
749
750 if (ntevs > 0) { /* Succeeded to find trace events */
751 pr_debug("Found %d probe_trace_events.\n", ntevs);
752 ret = post_process_probe_trace_events(*tevs, ntevs,
753 pev->target, pev->uprobes);
754 if (ret < 0 || ret == ntevs) {
755 clear_probe_trace_events(*tevs, ntevs);
756 zfree(tevs);
757 }
758 if (ret != ntevs)
759 return ret < 0 ? ret : ntevs;
760 ntevs = 0;
761 /* Fall through */
762 }
763
764 if (ntevs == 0) { /* No error but failed to find probe point. */
765 pr_warning("Probe point '%s' not found.\n",
766 synthesize_perf_probe_point(&pev->point));
767 return -ENOENT;
768 }
769 /* Error path : ntevs < 0 */
770 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
771 if (ntevs < 0) {
772 if (ntevs == -EBADF)
773 pr_warning("Warning: No dwarf info found in the vmlinux - "
774 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
775 if (!need_dwarf) {
776 pr_debug("Trying to use symbols.\n");
777 return 0;
778 }
779 }
780 return ntevs;
781 }
782
783 #define LINEBUF_SIZE 256
784 #define NR_ADDITIONAL_LINES 2
785
786 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
787 {
788 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
789 const char *color = show_num ? "" : PERF_COLOR_BLUE;
790 const char *prefix = NULL;
791
792 do {
793 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
794 goto error;
795 if (skip)
796 continue;
797 if (!prefix) {
798 prefix = show_num ? "%7d " : " ";
799 color_fprintf(stdout, color, prefix, l);
800 }
801 color_fprintf(stdout, color, "%s", buf);
802
803 } while (strchr(buf, '\n') == NULL);
804
805 return 1;
806 error:
807 if (ferror(fp)) {
808 pr_warning("File read error: %s\n",
809 strerror_r(errno, sbuf, sizeof(sbuf)));
810 return -1;
811 }
812 return 0;
813 }
814
815 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
816 {
817 int rv = __show_one_line(fp, l, skip, show_num);
818 if (rv == 0) {
819 pr_warning("Source file is shorter than expected.\n");
820 rv = -1;
821 }
822 return rv;
823 }
824
825 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
826 #define show_one_line(f,l) _show_one_line(f,l,false,false)
827 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
828 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
829
830 /*
831 * Show line-range always requires debuginfo to find source file and
832 * line number.
833 */
834 static int __show_line_range(struct line_range *lr, const char *module,
835 bool user)
836 {
837 int l = 1;
838 struct int_node *ln;
839 struct debuginfo *dinfo;
840 FILE *fp;
841 int ret;
842 char *tmp;
843 char sbuf[STRERR_BUFSIZE];
844
845 /* Search a line range */
846 dinfo = open_debuginfo(module, false);
847 if (!dinfo)
848 return -ENOENT;
849
850 ret = debuginfo__find_line_range(dinfo, lr);
851 if (!ret) { /* Not found, retry with an alternative */
852 ret = get_alternative_line_range(dinfo, lr, module, user);
853 if (!ret)
854 ret = debuginfo__find_line_range(dinfo, lr);
855 }
856 debuginfo__delete(dinfo);
857 if (ret == 0 || ret == -ENOENT) {
858 pr_warning("Specified source line is not found.\n");
859 return -ENOENT;
860 } else if (ret < 0) {
861 pr_warning("Debuginfo analysis failed.\n");
862 return ret;
863 }
864
865 /* Convert source file path */
866 tmp = lr->path;
867 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
868
869 /* Free old path when new path is assigned */
870 if (tmp != lr->path)
871 free(tmp);
872
873 if (ret < 0) {
874 pr_warning("Failed to find source file path.\n");
875 return ret;
876 }
877
878 setup_pager();
879
880 if (lr->function)
881 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
882 lr->start - lr->offset);
883 else
884 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
885
886 fp = fopen(lr->path, "r");
887 if (fp == NULL) {
888 pr_warning("Failed to open %s: %s\n", lr->path,
889 strerror_r(errno, sbuf, sizeof(sbuf)));
890 return -errno;
891 }
892 /* Skip to starting line number */
893 while (l < lr->start) {
894 ret = skip_one_line(fp, l++);
895 if (ret < 0)
896 goto end;
897 }
898
899 intlist__for_each_entry(ln, lr->line_list) {
900 for (; ln->i > l; l++) {
901 ret = show_one_line(fp, l - lr->offset);
902 if (ret < 0)
903 goto end;
904 }
905 ret = show_one_line_with_num(fp, l++ - lr->offset);
906 if (ret < 0)
907 goto end;
908 }
909
910 if (lr->end == INT_MAX)
911 lr->end = l + NR_ADDITIONAL_LINES;
912 while (l <= lr->end) {
913 ret = show_one_line_or_eof(fp, l++ - lr->offset);
914 if (ret <= 0)
915 break;
916 }
917 end:
918 fclose(fp);
919 return ret;
920 }
921
922 int show_line_range(struct line_range *lr, const char *module, bool user)
923 {
924 int ret;
925
926 ret = init_probe_symbol_maps(user);
927 if (ret < 0)
928 return ret;
929 ret = __show_line_range(lr, module, user);
930 exit_probe_symbol_maps();
931
932 return ret;
933 }
934
935 static int show_available_vars_at(struct debuginfo *dinfo,
936 struct perf_probe_event *pev,
937 struct strfilter *_filter)
938 {
939 char *buf;
940 int ret, i, nvars;
941 struct str_node *node;
942 struct variable_list *vls = NULL, *vl;
943 struct perf_probe_point tmp;
944 const char *var;
945
946 buf = synthesize_perf_probe_point(&pev->point);
947 if (!buf)
948 return -EINVAL;
949 pr_debug("Searching variables at %s\n", buf);
950
951 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
952 if (!ret) { /* Not found, retry with an alternative */
953 ret = get_alternative_probe_event(dinfo, pev, &tmp);
954 if (!ret) {
955 ret = debuginfo__find_available_vars_at(dinfo, pev,
956 &vls);
957 /* Release the old probe_point */
958 clear_perf_probe_point(&tmp);
959 }
960 }
961 if (ret <= 0) {
962 if (ret == 0 || ret == -ENOENT) {
963 pr_err("Failed to find the address of %s\n", buf);
964 ret = -ENOENT;
965 } else
966 pr_warning("Debuginfo analysis failed.\n");
967 goto end;
968 }
969
970 /* Some variables are found */
971 fprintf(stdout, "Available variables at %s\n", buf);
972 for (i = 0; i < ret; i++) {
973 vl = &vls[i];
974 /*
975 * A probe point might be converted to
976 * several trace points.
977 */
978 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
979 vl->point.offset);
980 zfree(&vl->point.symbol);
981 nvars = 0;
982 if (vl->vars) {
983 strlist__for_each_entry(node, vl->vars) {
984 var = strchr(node->s, '\t') + 1;
985 if (strfilter__compare(_filter, var)) {
986 fprintf(stdout, "\t\t%s\n", node->s);
987 nvars++;
988 }
989 }
990 strlist__delete(vl->vars);
991 }
992 if (nvars == 0)
993 fprintf(stdout, "\t\t(No matched variables)\n");
994 }
995 free(vls);
996 end:
997 free(buf);
998 return ret;
999 }
1000
1001 /* Show available variables on given probe point */
1002 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1003 struct strfilter *_filter)
1004 {
1005 int i, ret = 0;
1006 struct debuginfo *dinfo;
1007
1008 ret = init_probe_symbol_maps(pevs->uprobes);
1009 if (ret < 0)
1010 return ret;
1011
1012 dinfo = open_debuginfo(pevs->target, false);
1013 if (!dinfo) {
1014 ret = -ENOENT;
1015 goto out;
1016 }
1017
1018 setup_pager();
1019
1020 for (i = 0; i < npevs && ret >= 0; i++)
1021 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1022
1023 debuginfo__delete(dinfo);
1024 out:
1025 exit_probe_symbol_maps();
1026 return ret;
1027 }
1028
1029 #else /* !HAVE_DWARF_SUPPORT */
1030
1031 static void debuginfo_cache__exit(void)
1032 {
1033 }
1034
1035 static int
1036 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1037 struct perf_probe_point *pp __maybe_unused,
1038 bool is_kprobe __maybe_unused)
1039 {
1040 return -ENOSYS;
1041 }
1042
1043 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1044 struct probe_trace_event **tevs __maybe_unused)
1045 {
1046 if (perf_probe_event_need_dwarf(pev)) {
1047 pr_warning("Debuginfo-analysis is not supported.\n");
1048 return -ENOSYS;
1049 }
1050
1051 return 0;
1052 }
1053
1054 int show_line_range(struct line_range *lr __maybe_unused,
1055 const char *module __maybe_unused,
1056 bool user __maybe_unused)
1057 {
1058 pr_warning("Debuginfo-analysis is not supported.\n");
1059 return -ENOSYS;
1060 }
1061
1062 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1063 int npevs __maybe_unused,
1064 struct strfilter *filter __maybe_unused)
1065 {
1066 pr_warning("Debuginfo-analysis is not supported.\n");
1067 return -ENOSYS;
1068 }
1069 #endif
1070
1071 void line_range__clear(struct line_range *lr)
1072 {
1073 free(lr->function);
1074 free(lr->file);
1075 free(lr->path);
1076 free(lr->comp_dir);
1077 intlist__delete(lr->line_list);
1078 memset(lr, 0, sizeof(*lr));
1079 }
1080
1081 int line_range__init(struct line_range *lr)
1082 {
1083 memset(lr, 0, sizeof(*lr));
1084 lr->line_list = intlist__new(NULL);
1085 if (!lr->line_list)
1086 return -ENOMEM;
1087 else
1088 return 0;
1089 }
1090
1091 static int parse_line_num(char **ptr, int *val, const char *what)
1092 {
1093 const char *start = *ptr;
1094
1095 errno = 0;
1096 *val = strtol(*ptr, ptr, 0);
1097 if (errno || *ptr == start) {
1098 semantic_error("'%s' is not a valid number.\n", what);
1099 return -EINVAL;
1100 }
1101 return 0;
1102 }
1103
1104 /* Check the name is good for event, group or function */
1105 static bool is_c_func_name(const char *name)
1106 {
1107 if (!isalpha(*name) && *name != '_')
1108 return false;
1109 while (*++name != '\0') {
1110 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1111 return false;
1112 }
1113 return true;
1114 }
1115
1116 /*
1117 * Stuff 'lr' according to the line range described by 'arg'.
1118 * The line range syntax is described by:
1119 *
1120 * SRC[:SLN[+NUM|-ELN]]
1121 * FNC[@SRC][:SLN[+NUM|-ELN]]
1122 */
1123 int parse_line_range_desc(const char *arg, struct line_range *lr)
1124 {
1125 char *range, *file, *name = strdup(arg);
1126 int err;
1127
1128 if (!name)
1129 return -ENOMEM;
1130
1131 lr->start = 0;
1132 lr->end = INT_MAX;
1133
1134 range = strchr(name, ':');
1135 if (range) {
1136 *range++ = '\0';
1137
1138 err = parse_line_num(&range, &lr->start, "start line");
1139 if (err)
1140 goto err;
1141
1142 if (*range == '+' || *range == '-') {
1143 const char c = *range++;
1144
1145 err = parse_line_num(&range, &lr->end, "end line");
1146 if (err)
1147 goto err;
1148
1149 if (c == '+') {
1150 lr->end += lr->start;
1151 /*
1152 * Adjust the number of lines here.
1153 * If the number of lines == 1, the
1154 * the end of line should be equal to
1155 * the start of line.
1156 */
1157 lr->end--;
1158 }
1159 }
1160
1161 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1162
1163 err = -EINVAL;
1164 if (lr->start > lr->end) {
1165 semantic_error("Start line must be smaller"
1166 " than end line.\n");
1167 goto err;
1168 }
1169 if (*range != '\0') {
1170 semantic_error("Tailing with invalid str '%s'.\n", range);
1171 goto err;
1172 }
1173 }
1174
1175 file = strchr(name, '@');
1176 if (file) {
1177 *file = '\0';
1178 lr->file = strdup(++file);
1179 if (lr->file == NULL) {
1180 err = -ENOMEM;
1181 goto err;
1182 }
1183 lr->function = name;
1184 } else if (strchr(name, '/') || strchr(name, '.'))
1185 lr->file = name;
1186 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1187 lr->function = name;
1188 else { /* Invalid name */
1189 semantic_error("'%s' is not a valid function name.\n", name);
1190 err = -EINVAL;
1191 goto err;
1192 }
1193
1194 return 0;
1195 err:
1196 free(name);
1197 return err;
1198 }
1199
1200 /* Parse probepoint definition. */
1201 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1202 {
1203 struct perf_probe_point *pp = &pev->point;
1204 char *ptr, *tmp;
1205 char c, nc = 0;
1206 bool file_spec = false;
1207 /*
1208 * <Syntax>
1209 * perf probe [EVENT=]SRC[:LN|;PTN]
1210 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1211 *
1212 * TODO:Group name support
1213 */
1214 if (!arg)
1215 return -EINVAL;
1216
1217 ptr = strpbrk(arg, ";=@+%");
1218 if (ptr && *ptr == '=') { /* Event name */
1219 *ptr = '\0';
1220 tmp = ptr + 1;
1221 if (strchr(arg, ':')) {
1222 semantic_error("Group name is not supported yet.\n");
1223 return -ENOTSUP;
1224 }
1225 if (!is_c_func_name(arg)) {
1226 semantic_error("%s is bad for event name -it must "
1227 "follow C symbol-naming rule.\n", arg);
1228 return -EINVAL;
1229 }
1230 pev->event = strdup(arg);
1231 if (pev->event == NULL)
1232 return -ENOMEM;
1233 pev->group = NULL;
1234 arg = tmp;
1235 }
1236
1237 /*
1238 * Check arg is function or file name and copy it.
1239 *
1240 * We consider arg to be a file spec if and only if it satisfies
1241 * all of the below criteria::
1242 * - it does not include any of "+@%",
1243 * - it includes one of ":;", and
1244 * - it has a period '.' in the name.
1245 *
1246 * Otherwise, we consider arg to be a function specification.
1247 */
1248 if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
1249 /* This is a file spec if it includes a '.' before ; or : */
1250 if (memchr(arg, '.', ptr - arg))
1251 file_spec = true;
1252 }
1253
1254 ptr = strpbrk(arg, ";:+@%");
1255 if (ptr) {
1256 nc = *ptr;
1257 *ptr++ = '\0';
1258 }
1259
1260 if (arg[0] == '\0')
1261 tmp = NULL;
1262 else {
1263 tmp = strdup(arg);
1264 if (tmp == NULL)
1265 return -ENOMEM;
1266 }
1267
1268 if (file_spec)
1269 pp->file = tmp;
1270 else {
1271 pp->function = tmp;
1272
1273 /*
1274 * Keep pp->function even if this is absolute address,
1275 * so it can mark whether abs_address is valid.
1276 * Which make 'perf probe lib.bin 0x0' possible.
1277 *
1278 * Note that checking length of tmp is not needed
1279 * because when we access tmp[1] we know tmp[0] is '0',
1280 * so tmp[1] should always valid (but could be '\0').
1281 */
1282 if (tmp && !strncmp(tmp, "0x", 2)) {
1283 pp->abs_address = strtoul(pp->function, &tmp, 0);
1284 if (*tmp != '\0') {
1285 semantic_error("Invalid absolute address.\n");
1286 return -EINVAL;
1287 }
1288 }
1289 }
1290
1291 /* Parse other options */
1292 while (ptr) {
1293 arg = ptr;
1294 c = nc;
1295 if (c == ';') { /* Lazy pattern must be the last part */
1296 pp->lazy_line = strdup(arg);
1297 if (pp->lazy_line == NULL)
1298 return -ENOMEM;
1299 break;
1300 }
1301 ptr = strpbrk(arg, ";:+@%");
1302 if (ptr) {
1303 nc = *ptr;
1304 *ptr++ = '\0';
1305 }
1306 switch (c) {
1307 case ':': /* Line number */
1308 pp->line = strtoul(arg, &tmp, 0);
1309 if (*tmp != '\0') {
1310 semantic_error("There is non-digit char"
1311 " in line number.\n");
1312 return -EINVAL;
1313 }
1314 break;
1315 case '+': /* Byte offset from a symbol */
1316 pp->offset = strtoul(arg, &tmp, 0);
1317 if (*tmp != '\0') {
1318 semantic_error("There is non-digit character"
1319 " in offset.\n");
1320 return -EINVAL;
1321 }
1322 break;
1323 case '@': /* File name */
1324 if (pp->file) {
1325 semantic_error("SRC@SRC is not allowed.\n");
1326 return -EINVAL;
1327 }
1328 pp->file = strdup(arg);
1329 if (pp->file == NULL)
1330 return -ENOMEM;
1331 break;
1332 case '%': /* Probe places */
1333 if (strcmp(arg, "return") == 0) {
1334 pp->retprobe = 1;
1335 } else { /* Others not supported yet */
1336 semantic_error("%%%s is not supported.\n", arg);
1337 return -ENOTSUP;
1338 }
1339 break;
1340 default: /* Buggy case */
1341 pr_err("This program has a bug at %s:%d.\n",
1342 __FILE__, __LINE__);
1343 return -ENOTSUP;
1344 break;
1345 }
1346 }
1347
1348 /* Exclusion check */
1349 if (pp->lazy_line && pp->line) {
1350 semantic_error("Lazy pattern can't be used with"
1351 " line number.\n");
1352 return -EINVAL;
1353 }
1354
1355 if (pp->lazy_line && pp->offset) {
1356 semantic_error("Lazy pattern can't be used with offset.\n");
1357 return -EINVAL;
1358 }
1359
1360 if (pp->line && pp->offset) {
1361 semantic_error("Offset can't be used with line number.\n");
1362 return -EINVAL;
1363 }
1364
1365 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1366 semantic_error("File always requires line number or "
1367 "lazy pattern.\n");
1368 return -EINVAL;
1369 }
1370
1371 if (pp->offset && !pp->function) {
1372 semantic_error("Offset requires an entry function.\n");
1373 return -EINVAL;
1374 }
1375
1376 if (pp->retprobe && !pp->function) {
1377 semantic_error("Return probe requires an entry function.\n");
1378 return -EINVAL;
1379 }
1380
1381 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1382 semantic_error("Offset/Line/Lazy pattern can't be used with "
1383 "return probe.\n");
1384 return -EINVAL;
1385 }
1386
1387 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1388 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1389 pp->lazy_line);
1390 return 0;
1391 }
1392
1393 /* Parse perf-probe event argument */
1394 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1395 {
1396 char *tmp, *goodname;
1397 struct perf_probe_arg_field **fieldp;
1398
1399 pr_debug("parsing arg: %s into ", str);
1400
1401 tmp = strchr(str, '=');
1402 if (tmp) {
1403 arg->name = strndup(str, tmp - str);
1404 if (arg->name == NULL)
1405 return -ENOMEM;
1406 pr_debug("name:%s ", arg->name);
1407 str = tmp + 1;
1408 }
1409
1410 tmp = strchr(str, ':');
1411 if (tmp) { /* Type setting */
1412 *tmp = '\0';
1413 arg->type = strdup(tmp + 1);
1414 if (arg->type == NULL)
1415 return -ENOMEM;
1416 pr_debug("type:%s ", arg->type);
1417 }
1418
1419 tmp = strpbrk(str, "-.[");
1420 if (!is_c_varname(str) || !tmp) {
1421 /* A variable, register, symbol or special value */
1422 arg->var = strdup(str);
1423 if (arg->var == NULL)
1424 return -ENOMEM;
1425 pr_debug("%s\n", arg->var);
1426 return 0;
1427 }
1428
1429 /* Structure fields or array element */
1430 arg->var = strndup(str, tmp - str);
1431 if (arg->var == NULL)
1432 return -ENOMEM;
1433 goodname = arg->var;
1434 pr_debug("%s, ", arg->var);
1435 fieldp = &arg->field;
1436
1437 do {
1438 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1439 if (*fieldp == NULL)
1440 return -ENOMEM;
1441 if (*tmp == '[') { /* Array */
1442 str = tmp;
1443 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1444 (*fieldp)->ref = true;
1445 if (*tmp != ']' || tmp == str + 1) {
1446 semantic_error("Array index must be a"
1447 " number.\n");
1448 return -EINVAL;
1449 }
1450 tmp++;
1451 if (*tmp == '\0')
1452 tmp = NULL;
1453 } else { /* Structure */
1454 if (*tmp == '.') {
1455 str = tmp + 1;
1456 (*fieldp)->ref = false;
1457 } else if (tmp[1] == '>') {
1458 str = tmp + 2;
1459 (*fieldp)->ref = true;
1460 } else {
1461 semantic_error("Argument parse error: %s\n",
1462 str);
1463 return -EINVAL;
1464 }
1465 tmp = strpbrk(str, "-.[");
1466 }
1467 if (tmp) {
1468 (*fieldp)->name = strndup(str, tmp - str);
1469 if ((*fieldp)->name == NULL)
1470 return -ENOMEM;
1471 if (*str != '[')
1472 goodname = (*fieldp)->name;
1473 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1474 fieldp = &(*fieldp)->next;
1475 }
1476 } while (tmp);
1477 (*fieldp)->name = strdup(str);
1478 if ((*fieldp)->name == NULL)
1479 return -ENOMEM;
1480 if (*str != '[')
1481 goodname = (*fieldp)->name;
1482 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1483
1484 /* If no name is specified, set the last field name (not array index)*/
1485 if (!arg->name) {
1486 arg->name = strdup(goodname);
1487 if (arg->name == NULL)
1488 return -ENOMEM;
1489 }
1490 return 0;
1491 }
1492
1493 /* Parse perf-probe event command */
1494 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1495 {
1496 char **argv;
1497 int argc, i, ret = 0;
1498
1499 argv = argv_split(cmd, &argc);
1500 if (!argv) {
1501 pr_debug("Failed to split arguments.\n");
1502 return -ENOMEM;
1503 }
1504 if (argc - 1 > MAX_PROBE_ARGS) {
1505 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1506 ret = -ERANGE;
1507 goto out;
1508 }
1509 /* Parse probe point */
1510 ret = parse_perf_probe_point(argv[0], pev);
1511 if (ret < 0)
1512 goto out;
1513
1514 /* Copy arguments and ensure return probe has no C argument */
1515 pev->nargs = argc - 1;
1516 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1517 if (pev->args == NULL) {
1518 ret = -ENOMEM;
1519 goto out;
1520 }
1521 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1522 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1523 if (ret >= 0 &&
1524 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1525 semantic_error("You can't specify local variable for"
1526 " kretprobe.\n");
1527 ret = -EINVAL;
1528 }
1529 }
1530 out:
1531 argv_free(argv);
1532
1533 return ret;
1534 }
1535
1536 /* Return true if this perf_probe_event requires debuginfo */
1537 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1538 {
1539 int i;
1540
1541 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1542 return true;
1543
1544 for (i = 0; i < pev->nargs; i++)
1545 if (is_c_varname(pev->args[i].var))
1546 return true;
1547
1548 return false;
1549 }
1550
1551 /* Parse probe_events event into struct probe_point */
1552 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1553 {
1554 struct probe_trace_point *tp = &tev->point;
1555 char pr;
1556 char *p;
1557 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1558 int ret, i, argc;
1559 char **argv;
1560
1561 pr_debug("Parsing probe_events: %s\n", cmd);
1562 argv = argv_split(cmd, &argc);
1563 if (!argv) {
1564 pr_debug("Failed to split arguments.\n");
1565 return -ENOMEM;
1566 }
1567 if (argc < 2) {
1568 semantic_error("Too few probe arguments.\n");
1569 ret = -ERANGE;
1570 goto out;
1571 }
1572
1573 /* Scan event and group name. */
1574 argv0_str = strdup(argv[0]);
1575 if (argv0_str == NULL) {
1576 ret = -ENOMEM;
1577 goto out;
1578 }
1579 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1580 fmt2_str = strtok_r(NULL, "/", &fmt);
1581 fmt3_str = strtok_r(NULL, " \t", &fmt);
1582 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1583 || fmt3_str == NULL) {
1584 semantic_error("Failed to parse event name: %s\n", argv[0]);
1585 ret = -EINVAL;
1586 goto out;
1587 }
1588 pr = fmt1_str[0];
1589 tev->group = strdup(fmt2_str);
1590 tev->event = strdup(fmt3_str);
1591 if (tev->group == NULL || tev->event == NULL) {
1592 ret = -ENOMEM;
1593 goto out;
1594 }
1595 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1596
1597 tp->retprobe = (pr == 'r');
1598
1599 /* Scan module name(if there), function name and offset */
1600 p = strchr(argv[1], ':');
1601 if (p) {
1602 tp->module = strndup(argv[1], p - argv[1]);
1603 if (!tp->module) {
1604 ret = -ENOMEM;
1605 goto out;
1606 }
1607 p++;
1608 } else
1609 p = argv[1];
1610 fmt1_str = strtok_r(p, "+", &fmt);
1611 /* only the address started with 0x */
1612 if (fmt1_str[0] == '0') {
1613 /*
1614 * Fix a special case:
1615 * if address == 0, kernel reports something like:
1616 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1617 * Newer kernel may fix that, but we want to
1618 * support old kernel also.
1619 */
1620 if (strcmp(fmt1_str, "0x") == 0) {
1621 if (!argv[2] || strcmp(argv[2], "(null)")) {
1622 ret = -EINVAL;
1623 goto out;
1624 }
1625 tp->address = 0;
1626
1627 free(argv[2]);
1628 for (i = 2; argv[i + 1] != NULL; i++)
1629 argv[i] = argv[i + 1];
1630
1631 argv[i] = NULL;
1632 argc -= 1;
1633 } else
1634 tp->address = strtoul(fmt1_str, NULL, 0);
1635 } else {
1636 /* Only the symbol-based probe has offset */
1637 tp->symbol = strdup(fmt1_str);
1638 if (tp->symbol == NULL) {
1639 ret = -ENOMEM;
1640 goto out;
1641 }
1642 fmt2_str = strtok_r(NULL, "", &fmt);
1643 if (fmt2_str == NULL)
1644 tp->offset = 0;
1645 else
1646 tp->offset = strtoul(fmt2_str, NULL, 10);
1647 }
1648
1649 tev->nargs = argc - 2;
1650 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1651 if (tev->args == NULL) {
1652 ret = -ENOMEM;
1653 goto out;
1654 }
1655 for (i = 0; i < tev->nargs; i++) {
1656 p = strchr(argv[i + 2], '=');
1657 if (p) /* We don't need which register is assigned. */
1658 *p++ = '\0';
1659 else
1660 p = argv[i + 2];
1661 tev->args[i].name = strdup(argv[i + 2]);
1662 /* TODO: parse regs and offset */
1663 tev->args[i].value = strdup(p);
1664 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1665 ret = -ENOMEM;
1666 goto out;
1667 }
1668 }
1669 ret = 0;
1670 out:
1671 free(argv0_str);
1672 argv_free(argv);
1673 return ret;
1674 }
1675
1676 /* Compose only probe arg */
1677 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1678 {
1679 struct perf_probe_arg_field *field = pa->field;
1680 struct strbuf buf;
1681 char *ret = NULL;
1682 int err;
1683
1684 if (strbuf_init(&buf, 64) < 0)
1685 return NULL;
1686
1687 if (pa->name && pa->var)
1688 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1689 else
1690 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1691 if (err)
1692 goto out;
1693
1694 while (field) {
1695 if (field->name[0] == '[')
1696 err = strbuf_addstr(&buf, field->name);
1697 else
1698 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1699 field->name);
1700 field = field->next;
1701 if (err)
1702 goto out;
1703 }
1704
1705 if (pa->type)
1706 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1707 goto out;
1708
1709 ret = strbuf_detach(&buf, NULL);
1710 out:
1711 strbuf_release(&buf);
1712 return ret;
1713 }
1714
1715 /* Compose only probe point (not argument) */
1716 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1717 {
1718 struct strbuf buf;
1719 char *tmp, *ret = NULL;
1720 int len, err = 0;
1721
1722 if (strbuf_init(&buf, 64) < 0)
1723 return NULL;
1724
1725 if (pp->function) {
1726 if (strbuf_addstr(&buf, pp->function) < 0)
1727 goto out;
1728 if (pp->offset)
1729 err = strbuf_addf(&buf, "+%lu", pp->offset);
1730 else if (pp->line)
1731 err = strbuf_addf(&buf, ":%d", pp->line);
1732 else if (pp->retprobe)
1733 err = strbuf_addstr(&buf, "%return");
1734 if (err)
1735 goto out;
1736 }
1737 if (pp->file) {
1738 tmp = pp->file;
1739 len = strlen(tmp);
1740 if (len > 30) {
1741 tmp = strchr(pp->file + len - 30, '/');
1742 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1743 }
1744 err = strbuf_addf(&buf, "@%s", tmp);
1745 if (!err && !pp->function && pp->line)
1746 err = strbuf_addf(&buf, ":%d", pp->line);
1747 }
1748 if (!err)
1749 ret = strbuf_detach(&buf, NULL);
1750 out:
1751 strbuf_release(&buf);
1752 return ret;
1753 }
1754
1755 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1756 {
1757 struct strbuf buf;
1758 char *tmp, *ret = NULL;
1759 int i;
1760
1761 if (strbuf_init(&buf, 64))
1762 return NULL;
1763 if (pev->event)
1764 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1765 pev->event) < 0)
1766 goto out;
1767
1768 tmp = synthesize_perf_probe_point(&pev->point);
1769 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1770 goto out;
1771 free(tmp);
1772
1773 for (i = 0; i < pev->nargs; i++) {
1774 tmp = synthesize_perf_probe_arg(pev->args + i);
1775 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1776 goto out;
1777 free(tmp);
1778 }
1779
1780 ret = strbuf_detach(&buf, NULL);
1781 out:
1782 strbuf_release(&buf);
1783 return ret;
1784 }
1785
1786 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1787 struct strbuf *buf, int depth)
1788 {
1789 int err;
1790 if (ref->next) {
1791 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1792 depth + 1);
1793 if (depth < 0)
1794 return depth;
1795 }
1796 err = strbuf_addf(buf, "%+ld(", ref->offset);
1797 return (err < 0) ? err : depth;
1798 }
1799
1800 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1801 struct strbuf *buf)
1802 {
1803 struct probe_trace_arg_ref *ref = arg->ref;
1804 int depth = 0, err;
1805
1806 /* Argument name or separator */
1807 if (arg->name)
1808 err = strbuf_addf(buf, " %s=", arg->name);
1809 else
1810 err = strbuf_addch(buf, ' ');
1811 if (err)
1812 return err;
1813
1814 /* Special case: @XXX */
1815 if (arg->value[0] == '@' && arg->ref)
1816 ref = ref->next;
1817
1818 /* Dereferencing arguments */
1819 if (ref) {
1820 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1821 if (depth < 0)
1822 return depth;
1823 }
1824
1825 /* Print argument value */
1826 if (arg->value[0] == '@' && arg->ref)
1827 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
1828 else
1829 err = strbuf_addstr(buf, arg->value);
1830
1831 /* Closing */
1832 while (!err && depth--)
1833 err = strbuf_addch(buf, ')');
1834
1835 /* Print argument type */
1836 if (!err && arg->type)
1837 err = strbuf_addf(buf, ":%s", arg->type);
1838
1839 return err;
1840 }
1841
1842 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1843 {
1844 struct probe_trace_point *tp = &tev->point;
1845 struct strbuf buf;
1846 char *ret = NULL;
1847 int i, err;
1848
1849 /* Uprobes must have tp->module */
1850 if (tev->uprobes && !tp->module)
1851 return NULL;
1852
1853 if (strbuf_init(&buf, 32) < 0)
1854 return NULL;
1855
1856 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
1857 tev->group, tev->event) < 0)
1858 goto error;
1859 /*
1860 * If tp->address == 0, then this point must be a
1861 * absolute address uprobe.
1862 * try_to_find_absolute_address() should have made
1863 * tp->symbol to "0x0".
1864 */
1865 if (tev->uprobes && !tp->address) {
1866 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
1867 goto error;
1868 }
1869
1870 /* Use the tp->address for uprobes */
1871 if (tev->uprobes)
1872 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
1873 else if (!strncmp(tp->symbol, "0x", 2))
1874 /* Absolute address. See try_to_find_absolute_address() */
1875 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
1876 tp->module ? ":" : "", tp->address);
1877 else
1878 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
1879 tp->module ? ":" : "", tp->symbol, tp->offset);
1880 if (err)
1881 goto error;
1882
1883 for (i = 0; i < tev->nargs; i++)
1884 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
1885 goto error;
1886
1887 ret = strbuf_detach(&buf, NULL);
1888 error:
1889 strbuf_release(&buf);
1890 return ret;
1891 }
1892
1893 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
1894 struct perf_probe_point *pp,
1895 bool is_kprobe)
1896 {
1897 struct symbol *sym = NULL;
1898 struct map *map;
1899 u64 addr = tp->address;
1900 int ret = -ENOENT;
1901
1902 if (!is_kprobe) {
1903 map = dso__new_map(tp->module);
1904 if (!map)
1905 goto out;
1906 sym = map__find_symbol(map, addr, NULL);
1907 } else {
1908 if (tp->symbol && !addr) {
1909 if (kernel_get_symbol_address_by_name(tp->symbol,
1910 &addr, true, false) < 0)
1911 goto out;
1912 }
1913 if (addr) {
1914 addr += tp->offset;
1915 sym = __find_kernel_function(addr, &map);
1916 }
1917 }
1918
1919 if (!sym)
1920 goto out;
1921
1922 pp->retprobe = tp->retprobe;
1923 pp->offset = addr - map->unmap_ip(map, sym->start);
1924 pp->function = strdup(sym->name);
1925 ret = pp->function ? 0 : -ENOMEM;
1926
1927 out:
1928 if (map && !is_kprobe) {
1929 map__put(map);
1930 }
1931
1932 return ret;
1933 }
1934
1935 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1936 struct perf_probe_point *pp,
1937 bool is_kprobe)
1938 {
1939 char buf[128];
1940 int ret;
1941
1942 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
1943 if (!ret)
1944 return 0;
1945 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
1946 if (!ret)
1947 return 0;
1948
1949 pr_debug("Failed to find probe point from both of dwarf and map.\n");
1950
1951 if (tp->symbol) {
1952 pp->function = strdup(tp->symbol);
1953 pp->offset = tp->offset;
1954 } else {
1955 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
1956 if (ret < 0)
1957 return ret;
1958 pp->function = strdup(buf);
1959 pp->offset = 0;
1960 }
1961 if (pp->function == NULL)
1962 return -ENOMEM;
1963
1964 pp->retprobe = tp->retprobe;
1965
1966 return 0;
1967 }
1968
1969 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1970 struct perf_probe_event *pev, bool is_kprobe)
1971 {
1972 struct strbuf buf = STRBUF_INIT;
1973 int i, ret;
1974
1975 /* Convert event/group name */
1976 pev->event = strdup(tev->event);
1977 pev->group = strdup(tev->group);
1978 if (pev->event == NULL || pev->group == NULL)
1979 return -ENOMEM;
1980
1981 /* Convert trace_point to probe_point */
1982 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
1983 if (ret < 0)
1984 return ret;
1985
1986 /* Convert trace_arg to probe_arg */
1987 pev->nargs = tev->nargs;
1988 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1989 if (pev->args == NULL)
1990 return -ENOMEM;
1991 for (i = 0; i < tev->nargs && ret >= 0; i++) {
1992 if (tev->args[i].name)
1993 pev->args[i].name = strdup(tev->args[i].name);
1994 else {
1995 if ((ret = strbuf_init(&buf, 32)) < 0)
1996 goto error;
1997 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
1998 pev->args[i].name = strbuf_detach(&buf, NULL);
1999 }
2000 if (pev->args[i].name == NULL && ret >= 0)
2001 ret = -ENOMEM;
2002 }
2003 error:
2004 if (ret < 0)
2005 clear_perf_probe_event(pev);
2006
2007 return ret;
2008 }
2009
2010 void clear_perf_probe_event(struct perf_probe_event *pev)
2011 {
2012 struct perf_probe_arg_field *field, *next;
2013 int i;
2014
2015 free(pev->event);
2016 free(pev->group);
2017 free(pev->target);
2018 clear_perf_probe_point(&pev->point);
2019
2020 for (i = 0; i < pev->nargs; i++) {
2021 free(pev->args[i].name);
2022 free(pev->args[i].var);
2023 free(pev->args[i].type);
2024 field = pev->args[i].field;
2025 while (field) {
2026 next = field->next;
2027 zfree(&field->name);
2028 free(field);
2029 field = next;
2030 }
2031 }
2032 free(pev->args);
2033 memset(pev, 0, sizeof(*pev));
2034 }
2035
2036 #define strdup_or_goto(str, label) \
2037 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2038
2039 static int perf_probe_point__copy(struct perf_probe_point *dst,
2040 struct perf_probe_point *src)
2041 {
2042 dst->file = strdup_or_goto(src->file, out_err);
2043 dst->function = strdup_or_goto(src->function, out_err);
2044 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2045 dst->line = src->line;
2046 dst->retprobe = src->retprobe;
2047 dst->offset = src->offset;
2048 return 0;
2049
2050 out_err:
2051 clear_perf_probe_point(dst);
2052 return -ENOMEM;
2053 }
2054
2055 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2056 struct perf_probe_arg *src)
2057 {
2058 struct perf_probe_arg_field *field, **ppfield;
2059
2060 dst->name = strdup_or_goto(src->name, out_err);
2061 dst->var = strdup_or_goto(src->var, out_err);
2062 dst->type = strdup_or_goto(src->type, out_err);
2063
2064 field = src->field;
2065 ppfield = &(dst->field);
2066 while (field) {
2067 *ppfield = zalloc(sizeof(*field));
2068 if (!*ppfield)
2069 goto out_err;
2070 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2071 (*ppfield)->index = field->index;
2072 (*ppfield)->ref = field->ref;
2073 field = field->next;
2074 ppfield = &((*ppfield)->next);
2075 }
2076 return 0;
2077 out_err:
2078 return -ENOMEM;
2079 }
2080
2081 int perf_probe_event__copy(struct perf_probe_event *dst,
2082 struct perf_probe_event *src)
2083 {
2084 int i;
2085
2086 dst->event = strdup_or_goto(src->event, out_err);
2087 dst->group = strdup_or_goto(src->group, out_err);
2088 dst->target = strdup_or_goto(src->target, out_err);
2089 dst->uprobes = src->uprobes;
2090
2091 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2092 goto out_err;
2093
2094 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2095 if (!dst->args)
2096 goto out_err;
2097 dst->nargs = src->nargs;
2098
2099 for (i = 0; i < src->nargs; i++)
2100 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2101 goto out_err;
2102 return 0;
2103
2104 out_err:
2105 clear_perf_probe_event(dst);
2106 return -ENOMEM;
2107 }
2108
2109 void clear_probe_trace_event(struct probe_trace_event *tev)
2110 {
2111 struct probe_trace_arg_ref *ref, *next;
2112 int i;
2113
2114 free(tev->event);
2115 free(tev->group);
2116 free(tev->point.symbol);
2117 free(tev->point.realname);
2118 free(tev->point.module);
2119 for (i = 0; i < tev->nargs; i++) {
2120 free(tev->args[i].name);
2121 free(tev->args[i].value);
2122 free(tev->args[i].type);
2123 ref = tev->args[i].ref;
2124 while (ref) {
2125 next = ref->next;
2126 free(ref);
2127 ref = next;
2128 }
2129 }
2130 free(tev->args);
2131 memset(tev, 0, sizeof(*tev));
2132 }
2133
2134 struct kprobe_blacklist_node {
2135 struct list_head list;
2136 unsigned long start;
2137 unsigned long end;
2138 char *symbol;
2139 };
2140
2141 static void kprobe_blacklist__delete(struct list_head *blacklist)
2142 {
2143 struct kprobe_blacklist_node *node;
2144
2145 while (!list_empty(blacklist)) {
2146 node = list_first_entry(blacklist,
2147 struct kprobe_blacklist_node, list);
2148 list_del(&node->list);
2149 free(node->symbol);
2150 free(node);
2151 }
2152 }
2153
2154 static int kprobe_blacklist__load(struct list_head *blacklist)
2155 {
2156 struct kprobe_blacklist_node *node;
2157 const char *__debugfs = debugfs__mountpoint();
2158 char buf[PATH_MAX], *p;
2159 FILE *fp;
2160 int ret;
2161
2162 if (__debugfs == NULL)
2163 return -ENOTSUP;
2164
2165 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2166 if (ret < 0)
2167 return ret;
2168
2169 fp = fopen(buf, "r");
2170 if (!fp)
2171 return -errno;
2172
2173 ret = 0;
2174 while (fgets(buf, PATH_MAX, fp)) {
2175 node = zalloc(sizeof(*node));
2176 if (!node) {
2177 ret = -ENOMEM;
2178 break;
2179 }
2180 INIT_LIST_HEAD(&node->list);
2181 list_add_tail(&node->list, blacklist);
2182 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2183 ret = -EINVAL;
2184 break;
2185 }
2186 p = strchr(buf, '\t');
2187 if (p) {
2188 p++;
2189 if (p[strlen(p) - 1] == '\n')
2190 p[strlen(p) - 1] = '\0';
2191 } else
2192 p = (char *)"unknown";
2193 node->symbol = strdup(p);
2194 if (!node->symbol) {
2195 ret = -ENOMEM;
2196 break;
2197 }
2198 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2199 node->start, node->end, node->symbol);
2200 ret++;
2201 }
2202 if (ret < 0)
2203 kprobe_blacklist__delete(blacklist);
2204 fclose(fp);
2205
2206 return ret;
2207 }
2208
2209 static struct kprobe_blacklist_node *
2210 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2211 unsigned long address)
2212 {
2213 struct kprobe_blacklist_node *node;
2214
2215 list_for_each_entry(node, blacklist, list) {
2216 if (node->start <= address && address <= node->end)
2217 return node;
2218 }
2219
2220 return NULL;
2221 }
2222
2223 static LIST_HEAD(kprobe_blacklist);
2224
2225 static void kprobe_blacklist__init(void)
2226 {
2227 if (!list_empty(&kprobe_blacklist))
2228 return;
2229
2230 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2231 pr_debug("No kprobe blacklist support, ignored\n");
2232 }
2233
2234 static void kprobe_blacklist__release(void)
2235 {
2236 kprobe_blacklist__delete(&kprobe_blacklist);
2237 }
2238
2239 static bool kprobe_blacklist__listed(unsigned long address)
2240 {
2241 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2242 }
2243
2244 static int perf_probe_event__sprintf(const char *group, const char *event,
2245 struct perf_probe_event *pev,
2246 const char *module,
2247 struct strbuf *result)
2248 {
2249 int i, ret;
2250 char *buf;
2251
2252 if (asprintf(&buf, "%s:%s", group, event) < 0)
2253 return -errno;
2254 ret = strbuf_addf(result, " %-20s (on ", buf);
2255 free(buf);
2256 if (ret)
2257 return ret;
2258
2259 /* Synthesize only event probe point */
2260 buf = synthesize_perf_probe_point(&pev->point);
2261 if (!buf)
2262 return -ENOMEM;
2263 ret = strbuf_addstr(result, buf);
2264 free(buf);
2265
2266 if (!ret && module)
2267 ret = strbuf_addf(result, " in %s", module);
2268
2269 if (!ret && pev->nargs > 0) {
2270 ret = strbuf_add(result, " with", 5);
2271 for (i = 0; !ret && i < pev->nargs; i++) {
2272 buf = synthesize_perf_probe_arg(&pev->args[i]);
2273 if (!buf)
2274 return -ENOMEM;
2275 ret = strbuf_addf(result, " %s", buf);
2276 free(buf);
2277 }
2278 }
2279 if (!ret)
2280 ret = strbuf_addch(result, ')');
2281
2282 return ret;
2283 }
2284
2285 /* Show an event */
2286 int show_perf_probe_event(const char *group, const char *event,
2287 struct perf_probe_event *pev,
2288 const char *module, bool use_stdout)
2289 {
2290 struct strbuf buf = STRBUF_INIT;
2291 int ret;
2292
2293 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2294 if (ret >= 0) {
2295 if (use_stdout)
2296 printf("%s\n", buf.buf);
2297 else
2298 pr_info("%s\n", buf.buf);
2299 }
2300 strbuf_release(&buf);
2301
2302 return ret;
2303 }
2304
2305 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2306 struct strfilter *filter)
2307 {
2308 char tmp[128];
2309
2310 /* At first, check the event name itself */
2311 if (strfilter__compare(filter, tev->event))
2312 return true;
2313
2314 /* Next, check the combination of name and group */
2315 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2316 return false;
2317 return strfilter__compare(filter, tmp);
2318 }
2319
2320 static int __show_perf_probe_events(int fd, bool is_kprobe,
2321 struct strfilter *filter)
2322 {
2323 int ret = 0;
2324 struct probe_trace_event tev;
2325 struct perf_probe_event pev;
2326 struct strlist *rawlist;
2327 struct str_node *ent;
2328
2329 memset(&tev, 0, sizeof(tev));
2330 memset(&pev, 0, sizeof(pev));
2331
2332 rawlist = probe_file__get_rawlist(fd);
2333 if (!rawlist)
2334 return -ENOMEM;
2335
2336 strlist__for_each_entry(ent, rawlist) {
2337 ret = parse_probe_trace_command(ent->s, &tev);
2338 if (ret >= 0) {
2339 if (!filter_probe_trace_event(&tev, filter))
2340 goto next;
2341 ret = convert_to_perf_probe_event(&tev, &pev,
2342 is_kprobe);
2343 if (ret < 0)
2344 goto next;
2345 ret = show_perf_probe_event(pev.group, pev.event,
2346 &pev, tev.point.module,
2347 true);
2348 }
2349 next:
2350 clear_perf_probe_event(&pev);
2351 clear_probe_trace_event(&tev);
2352 if (ret < 0)
2353 break;
2354 }
2355 strlist__delete(rawlist);
2356 /* Cleanup cached debuginfo if needed */
2357 debuginfo_cache__exit();
2358
2359 return ret;
2360 }
2361
2362 /* List up current perf-probe events */
2363 int show_perf_probe_events(struct strfilter *filter)
2364 {
2365 int kp_fd, up_fd, ret;
2366
2367 setup_pager();
2368
2369 ret = init_probe_symbol_maps(false);
2370 if (ret < 0)
2371 return ret;
2372
2373 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2374 if (ret < 0)
2375 return ret;
2376
2377 if (kp_fd >= 0)
2378 ret = __show_perf_probe_events(kp_fd, true, filter);
2379 if (up_fd >= 0 && ret >= 0)
2380 ret = __show_perf_probe_events(up_fd, false, filter);
2381 if (kp_fd > 0)
2382 close(kp_fd);
2383 if (up_fd > 0)
2384 close(up_fd);
2385 exit_probe_symbol_maps();
2386
2387 return ret;
2388 }
2389
2390 static int get_new_event_name(char *buf, size_t len, const char *base,
2391 struct strlist *namelist, bool allow_suffix)
2392 {
2393 int i, ret;
2394 char *p, *nbase;
2395
2396 if (*base == '.')
2397 base++;
2398 nbase = strdup(base);
2399 if (!nbase)
2400 return -ENOMEM;
2401
2402 /* Cut off the dot suffixes (e.g. .const, .isra)*/
2403 p = strchr(nbase, '.');
2404 if (p && p != nbase)
2405 *p = '\0';
2406
2407 /* Try no suffix number */
2408 ret = e_snprintf(buf, len, "%s", nbase);
2409 if (ret < 0) {
2410 pr_debug("snprintf() failed: %d\n", ret);
2411 goto out;
2412 }
2413 if (!strlist__has_entry(namelist, buf))
2414 goto out;
2415
2416 if (!allow_suffix) {
2417 pr_warning("Error: event \"%s\" already exists.\n"
2418 " Hint: Remove existing event by 'perf probe -d'\n"
2419 " or force duplicates by 'perf probe -f'\n"
2420 " or set 'force=yes' in BPF source.\n",
2421 buf);
2422 ret = -EEXIST;
2423 goto out;
2424 }
2425
2426 /* Try to add suffix */
2427 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2428 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2429 if (ret < 0) {
2430 pr_debug("snprintf() failed: %d\n", ret);
2431 goto out;
2432 }
2433 if (!strlist__has_entry(namelist, buf))
2434 break;
2435 }
2436 if (i == MAX_EVENT_INDEX) {
2437 pr_warning("Too many events are on the same function.\n");
2438 ret = -ERANGE;
2439 }
2440
2441 out:
2442 free(nbase);
2443 return ret;
2444 }
2445
2446 /* Warn if the current kernel's uprobe implementation is old */
2447 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2448 {
2449 int i;
2450 char *buf = synthesize_probe_trace_command(tev);
2451
2452 /* Old uprobe event doesn't support memory dereference */
2453 if (!tev->uprobes || tev->nargs == 0 || !buf)
2454 goto out;
2455
2456 for (i = 0; i < tev->nargs; i++)
2457 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2458 pr_warning("Please upgrade your kernel to at least "
2459 "3.14 to have access to feature %s\n",
2460 tev->args[i].value);
2461 break;
2462 }
2463 out:
2464 free(buf);
2465 }
2466
2467 /* Set new name from original perf_probe_event and namelist */
2468 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2469 struct perf_probe_event *pev,
2470 struct strlist *namelist,
2471 bool allow_suffix)
2472 {
2473 const char *event, *group;
2474 char buf[64];
2475 int ret;
2476
2477 /* If probe_event or trace_event already have the name, reuse it */
2478 if (pev->event)
2479 event = pev->event;
2480 else if (tev->event)
2481 event = tev->event;
2482 else {
2483 /* Or generate new one from probe point */
2484 if (pev->point.function &&
2485 (strncmp(pev->point.function, "0x", 2) != 0) &&
2486 !strisglob(pev->point.function))
2487 event = pev->point.function;
2488 else
2489 event = tev->point.realname;
2490 }
2491 if (pev->group)
2492 group = pev->group;
2493 else if (tev->group)
2494 group = tev->group;
2495 else
2496 group = PERFPROBE_GROUP;
2497
2498 /* Get an unused new event name */
2499 ret = get_new_event_name(buf, 64, event,
2500 namelist, allow_suffix);
2501 if (ret < 0)
2502 return ret;
2503
2504 event = buf;
2505
2506 tev->event = strdup(event);
2507 tev->group = strdup(group);
2508 if (tev->event == NULL || tev->group == NULL)
2509 return -ENOMEM;
2510
2511 /* Add added event name to namelist */
2512 strlist__add(namelist, event);
2513 return 0;
2514 }
2515
2516 static int __add_probe_trace_events(struct perf_probe_event *pev,
2517 struct probe_trace_event *tevs,
2518 int ntevs, bool allow_suffix)
2519 {
2520 int i, fd, ret;
2521 struct probe_trace_event *tev = NULL;
2522 struct probe_cache *cache = NULL;
2523 struct strlist *namelist;
2524
2525 fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
2526 if (fd < 0)
2527 return fd;
2528
2529 /* Get current event names */
2530 namelist = probe_file__get_namelist(fd);
2531 if (!namelist) {
2532 pr_debug("Failed to get current event list.\n");
2533 ret = -ENOMEM;
2534 goto close_out;
2535 }
2536
2537 ret = 0;
2538 for (i = 0; i < ntevs; i++) {
2539 tev = &tevs[i];
2540 /* Skip if the symbol is out of .text or blacklisted */
2541 if (!tev->point.symbol && !pev->uprobes)
2542 continue;
2543
2544 /* Set new name for tev (and update namelist) */
2545 ret = probe_trace_event__set_name(tev, pev, namelist,
2546 allow_suffix);
2547 if (ret < 0)
2548 break;
2549
2550 ret = probe_file__add_event(fd, tev);
2551 if (ret < 0)
2552 break;
2553
2554 /*
2555 * Probes after the first probe which comes from same
2556 * user input are always allowed to add suffix, because
2557 * there might be several addresses corresponding to
2558 * one code line.
2559 */
2560 allow_suffix = true;
2561 }
2562 if (ret == -EINVAL && pev->uprobes)
2563 warn_uprobe_event_compat(tev);
2564 if (ret == 0 && probe_conf.cache) {
2565 cache = probe_cache__new(pev->target);
2566 if (!cache ||
2567 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2568 probe_cache__commit(cache) < 0)
2569 pr_warning("Failed to add event to probe cache\n");
2570 probe_cache__delete(cache);
2571 }
2572
2573 strlist__delete(namelist);
2574 close_out:
2575 close(fd);
2576 return ret;
2577 }
2578
2579 static int find_probe_functions(struct map *map, char *name,
2580 struct symbol **syms)
2581 {
2582 int found = 0;
2583 struct symbol *sym;
2584 struct rb_node *tmp;
2585
2586 if (map__load(map, NULL) < 0)
2587 return 0;
2588
2589 map__for_each_symbol(map, sym, tmp) {
2590 if (strglobmatch(sym->name, name)) {
2591 found++;
2592 if (syms && found < probe_conf.max_probes)
2593 syms[found - 1] = sym;
2594 }
2595 }
2596
2597 return found;
2598 }
2599
2600 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2601 struct probe_trace_event *tev __maybe_unused,
2602 struct map *map __maybe_unused,
2603 struct symbol *sym __maybe_unused) { }
2604
2605 /*
2606 * Find probe function addresses from map.
2607 * Return an error or the number of found probe_trace_event
2608 */
2609 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2610 struct probe_trace_event **tevs)
2611 {
2612 struct map *map = NULL;
2613 struct ref_reloc_sym *reloc_sym = NULL;
2614 struct symbol *sym;
2615 struct symbol **syms = NULL;
2616 struct probe_trace_event *tev;
2617 struct perf_probe_point *pp = &pev->point;
2618 struct probe_trace_point *tp;
2619 int num_matched_functions;
2620 int ret, i, j, skipped = 0;
2621 char *mod_name;
2622
2623 map = get_target_map(pev->target, pev->uprobes);
2624 if (!map) {
2625 ret = -EINVAL;
2626 goto out;
2627 }
2628
2629 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2630 if (!syms) {
2631 ret = -ENOMEM;
2632 goto out;
2633 }
2634
2635 /*
2636 * Load matched symbols: Since the different local symbols may have
2637 * same name but different addresses, this lists all the symbols.
2638 */
2639 num_matched_functions = find_probe_functions(map, pp->function, syms);
2640 if (num_matched_functions == 0) {
2641 pr_err("Failed to find symbol %s in %s\n", pp->function,
2642 pev->target ? : "kernel");
2643 ret = -ENOENT;
2644 goto out;
2645 } else if (num_matched_functions > probe_conf.max_probes) {
2646 pr_err("Too many functions matched in %s\n",
2647 pev->target ? : "kernel");
2648 ret = -E2BIG;
2649 goto out;
2650 }
2651
2652 /* Note that the symbols in the kmodule are not relocated */
2653 if (!pev->uprobes && !pp->retprobe && !pev->target) {
2654 reloc_sym = kernel_get_ref_reloc_sym();
2655 if (!reloc_sym) {
2656 pr_warning("Relocated base symbol is not found!\n");
2657 ret = -EINVAL;
2658 goto out;
2659 }
2660 }
2661
2662 /* Setup result trace-probe-events */
2663 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2664 if (!*tevs) {
2665 ret = -ENOMEM;
2666 goto out;
2667 }
2668
2669 ret = 0;
2670
2671 for (j = 0; j < num_matched_functions; j++) {
2672 sym = syms[j];
2673
2674 tev = (*tevs) + ret;
2675 tp = &tev->point;
2676 if (ret == num_matched_functions) {
2677 pr_warning("Too many symbols are listed. Skip it.\n");
2678 break;
2679 }
2680 ret++;
2681
2682 if (pp->offset > sym->end - sym->start) {
2683 pr_warning("Offset %ld is bigger than the size of %s\n",
2684 pp->offset, sym->name);
2685 ret = -ENOENT;
2686 goto err_out;
2687 }
2688 /* Add one probe point */
2689 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2690
2691 /* Check the kprobe (not in module) is within .text */
2692 if (!pev->uprobes && !pev->target &&
2693 kprobe_warn_out_range(sym->name, tp->address)) {
2694 tp->symbol = NULL; /* Skip it */
2695 skipped++;
2696 } else if (reloc_sym) {
2697 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2698 tp->offset = tp->address - reloc_sym->addr;
2699 } else {
2700 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2701 tp->offset = pp->offset;
2702 }
2703 tp->realname = strdup_or_goto(sym->name, nomem_out);
2704
2705 tp->retprobe = pp->retprobe;
2706 if (pev->target) {
2707 if (pev->uprobes) {
2708 tev->point.module = strdup_or_goto(pev->target,
2709 nomem_out);
2710 } else {
2711 mod_name = find_module_name(pev->target);
2712 tev->point.module =
2713 strdup(mod_name ? mod_name : pev->target);
2714 free(mod_name);
2715 if (!tev->point.module)
2716 goto nomem_out;
2717 }
2718 }
2719 tev->uprobes = pev->uprobes;
2720 tev->nargs = pev->nargs;
2721 if (tev->nargs) {
2722 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2723 tev->nargs);
2724 if (tev->args == NULL)
2725 goto nomem_out;
2726 }
2727 for (i = 0; i < tev->nargs; i++) {
2728 if (pev->args[i].name)
2729 tev->args[i].name =
2730 strdup_or_goto(pev->args[i].name,
2731 nomem_out);
2732
2733 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2734 nomem_out);
2735 if (pev->args[i].type)
2736 tev->args[i].type =
2737 strdup_or_goto(pev->args[i].type,
2738 nomem_out);
2739 }
2740 arch__fix_tev_from_maps(pev, tev, map, sym);
2741 }
2742 if (ret == skipped) {
2743 ret = -ENOENT;
2744 goto err_out;
2745 }
2746
2747 out:
2748 put_target_map(map, pev->uprobes);
2749 free(syms);
2750 return ret;
2751
2752 nomem_out:
2753 ret = -ENOMEM;
2754 err_out:
2755 clear_probe_trace_events(*tevs, num_matched_functions);
2756 zfree(tevs);
2757 goto out;
2758 }
2759
2760 static int try_to_find_absolute_address(struct perf_probe_event *pev,
2761 struct probe_trace_event **tevs)
2762 {
2763 struct perf_probe_point *pp = &pev->point;
2764 struct probe_trace_event *tev;
2765 struct probe_trace_point *tp;
2766 int i, err;
2767
2768 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
2769 return -EINVAL;
2770 if (perf_probe_event_need_dwarf(pev))
2771 return -EINVAL;
2772
2773 /*
2774 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
2775 * absolute address.
2776 *
2777 * Only one tev can be generated by this.
2778 */
2779 *tevs = zalloc(sizeof(*tev));
2780 if (!*tevs)
2781 return -ENOMEM;
2782
2783 tev = *tevs;
2784 tp = &tev->point;
2785
2786 /*
2787 * Don't use tp->offset, use address directly, because
2788 * in synthesize_probe_trace_command() address cannot be
2789 * zero.
2790 */
2791 tp->address = pev->point.abs_address;
2792 tp->retprobe = pp->retprobe;
2793 tev->uprobes = pev->uprobes;
2794
2795 err = -ENOMEM;
2796 /*
2797 * Give it a '0x' leading symbol name.
2798 * In __add_probe_trace_events, a NULL symbol is interpreted as
2799 * invalud.
2800 */
2801 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
2802 goto errout;
2803
2804 /* For kprobe, check range */
2805 if ((!tev->uprobes) &&
2806 (kprobe_warn_out_range(tev->point.symbol,
2807 tev->point.address))) {
2808 err = -EACCES;
2809 goto errout;
2810 }
2811
2812 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
2813 goto errout;
2814
2815 if (pev->target) {
2816 tp->module = strdup(pev->target);
2817 if (!tp->module)
2818 goto errout;
2819 }
2820
2821 if (tev->group) {
2822 tev->group = strdup(pev->group);
2823 if (!tev->group)
2824 goto errout;
2825 }
2826
2827 if (pev->event) {
2828 tev->event = strdup(pev->event);
2829 if (!tev->event)
2830 goto errout;
2831 }
2832
2833 tev->nargs = pev->nargs;
2834 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
2835 if (!tev->args) {
2836 err = -ENOMEM;
2837 goto errout;
2838 }
2839 for (i = 0; i < tev->nargs; i++)
2840 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
2841
2842 return 1;
2843
2844 errout:
2845 if (*tevs) {
2846 clear_probe_trace_events(*tevs, 1);
2847 *tevs = NULL;
2848 }
2849 return err;
2850 }
2851
2852 bool __weak arch__prefers_symtab(void) { return false; }
2853
2854 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
2855 struct probe_trace_event **tevs)
2856 {
2857 struct probe_cache *cache;
2858 struct probe_cache_entry *entry;
2859 struct probe_trace_event *tev;
2860 struct str_node *node;
2861 int ret, i;
2862
2863 cache = probe_cache__new(pev->target);
2864 if (!cache)
2865 return 0;
2866
2867 entry = probe_cache__find(cache, pev);
2868 if (!entry) {
2869 ret = 0;
2870 goto out;
2871 }
2872
2873 ret = strlist__nr_entries(entry->tevlist);
2874 if (ret > probe_conf.max_probes) {
2875 pr_debug("Too many entries matched in the cache of %s\n",
2876 pev->target ? : "kernel");
2877 ret = -E2BIG;
2878 goto out;
2879 }
2880
2881 *tevs = zalloc(ret * sizeof(*tev));
2882 if (!*tevs) {
2883 ret = -ENOMEM;
2884 goto out;
2885 }
2886
2887 i = 0;
2888 strlist__for_each_entry(node, entry->tevlist) {
2889 tev = &(*tevs)[i++];
2890 ret = parse_probe_trace_command(node->s, tev);
2891 if (ret < 0)
2892 goto out;
2893 /* Set the uprobes attribute as same as original */
2894 tev->uprobes = pev->uprobes;
2895 }
2896 ret = i;
2897
2898 out:
2899 probe_cache__delete(cache);
2900 return ret;
2901 }
2902
2903 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
2904 struct probe_trace_event **tevs)
2905 {
2906 int ret;
2907
2908 if (!pev->group) {
2909 /* Set group name if not given */
2910 if (!pev->uprobes) {
2911 pev->group = strdup(PERFPROBE_GROUP);
2912 ret = pev->group ? 0 : -ENOMEM;
2913 } else
2914 ret = convert_exec_to_group(pev->target, &pev->group);
2915 if (ret != 0) {
2916 pr_warning("Failed to make a group name.\n");
2917 return ret;
2918 }
2919 }
2920
2921 ret = try_to_find_absolute_address(pev, tevs);
2922 if (ret > 0)
2923 return ret;
2924
2925 /* At first, we need to lookup cache entry */
2926 ret = find_probe_trace_events_from_cache(pev, tevs);
2927 if (ret > 0)
2928 return ret; /* Found in probe cache */
2929
2930 if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
2931 ret = find_probe_trace_events_from_map(pev, tevs);
2932 if (ret > 0)
2933 return ret; /* Found in symbol table */
2934 }
2935
2936 /* Convert perf_probe_event with debuginfo */
2937 ret = try_to_find_probe_trace_events(pev, tevs);
2938 if (ret != 0)
2939 return ret; /* Found in debuginfo or got an error */
2940
2941 return find_probe_trace_events_from_map(pev, tevs);
2942 }
2943
2944 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2945 {
2946 int i, ret;
2947
2948 /* Loop 1: convert all events */
2949 for (i = 0; i < npevs; i++) {
2950 /* Init kprobe blacklist if needed */
2951 if (!pevs[i].uprobes)
2952 kprobe_blacklist__init();
2953 /* Convert with or without debuginfo */
2954 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
2955 if (ret < 0)
2956 return ret;
2957 pevs[i].ntevs = ret;
2958 }
2959 /* This just release blacklist only if allocated */
2960 kprobe_blacklist__release();
2961
2962 return 0;
2963 }
2964
2965 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2966 {
2967 int i, ret = 0;
2968
2969 /* Loop 2: add all events */
2970 for (i = 0; i < npevs; i++) {
2971 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
2972 pevs[i].ntevs,
2973 probe_conf.force_add);
2974 if (ret < 0)
2975 break;
2976 }
2977 return ret;
2978 }
2979
2980 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2981 {
2982 int i, j;
2983
2984 /* Loop 3: cleanup and free trace events */
2985 for (i = 0; i < npevs; i++) {
2986 for (j = 0; j < pevs[i].ntevs; j++)
2987 clear_probe_trace_event(&pevs[i].tevs[j]);
2988 zfree(&pevs[i].tevs);
2989 pevs[i].ntevs = 0;
2990 clear_perf_probe_event(&pevs[i]);
2991 }
2992 }
2993
2994 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
2995 {
2996 int ret;
2997
2998 ret = init_probe_symbol_maps(pevs->uprobes);
2999 if (ret < 0)
3000 return ret;
3001
3002 ret = convert_perf_probe_events(pevs, npevs);
3003 if (ret == 0)
3004 ret = apply_perf_probe_events(pevs, npevs);
3005
3006 cleanup_perf_probe_events(pevs, npevs);
3007
3008 exit_probe_symbol_maps();
3009 return ret;
3010 }
3011
3012 int del_perf_probe_events(struct strfilter *filter)
3013 {
3014 int ret, ret2, ufd = -1, kfd = -1;
3015 char *str = strfilter__string(filter);
3016
3017 if (!str)
3018 return -EINVAL;
3019
3020 /* Get current event names */
3021 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3022 if (ret < 0)
3023 goto out;
3024
3025 ret = probe_file__del_events(kfd, filter);
3026 if (ret < 0 && ret != -ENOENT)
3027 goto error;
3028
3029 ret2 = probe_file__del_events(ufd, filter);
3030 if (ret2 < 0 && ret2 != -ENOENT) {
3031 ret = ret2;
3032 goto error;
3033 }
3034 ret = 0;
3035
3036 error:
3037 if (kfd >= 0)
3038 close(kfd);
3039 if (ufd >= 0)
3040 close(ufd);
3041 out:
3042 free(str);
3043
3044 return ret;
3045 }
3046
3047 /* TODO: don't use a global variable for filter ... */
3048 static struct strfilter *available_func_filter;
3049
3050 /*
3051 * If a symbol corresponds to a function with global binding and
3052 * matches filter return 0. For all others return 1.
3053 */
3054 static int filter_available_functions(struct map *map __maybe_unused,
3055 struct symbol *sym)
3056 {
3057 if (strfilter__compare(available_func_filter, sym->name))
3058 return 0;
3059 return 1;
3060 }
3061
3062 int show_available_funcs(const char *target, struct strfilter *_filter,
3063 bool user)
3064 {
3065 struct map *map;
3066 int ret;
3067
3068 ret = init_probe_symbol_maps(user);
3069 if (ret < 0)
3070 return ret;
3071
3072 /* Get a symbol map */
3073 if (user)
3074 map = dso__new_map(target);
3075 else
3076 map = kernel_get_module_map(target);
3077 if (!map) {
3078 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3079 return -EINVAL;
3080 }
3081
3082 /* Load symbols with given filter */
3083 available_func_filter = _filter;
3084 if (map__load(map, filter_available_functions)) {
3085 pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
3086 goto end;
3087 }
3088 if (!dso__sorted_by_name(map->dso, map->type))
3089 dso__sort_by_name(map->dso, map->type);
3090
3091 /* Show all (filtered) symbols */
3092 setup_pager();
3093 dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
3094 end:
3095 if (user) {
3096 map__put(map);
3097 }
3098 exit_probe_symbol_maps();
3099
3100 return ret;
3101 }
3102
3103 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3104 struct perf_probe_arg *pvar)
3105 {
3106 tvar->value = strdup(pvar->var);
3107 if (tvar->value == NULL)
3108 return -ENOMEM;
3109 if (pvar->type) {
3110 tvar->type = strdup(pvar->type);
3111 if (tvar->type == NULL)
3112 return -ENOMEM;
3113 }
3114 if (pvar->name) {
3115 tvar->name = strdup(pvar->name);
3116 if (tvar->name == NULL)
3117 return -ENOMEM;
3118 } else
3119 tvar->name = NULL;
3120 return 0;
3121 }
Linux kernel - Deliverables
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