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m68knommu: fix user a5 register being overwritten
[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 (!str_error_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 str_error_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 str_error_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 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1201 {
1202 char *ptr;
1203
1204 ptr = strchr(*arg, ':');
1205 if (ptr) {
1206 *ptr = '\0';
1207 if (!pev->sdt && !is_c_func_name(*arg))
1208 goto ng_name;
1209 pev->group = strdup(*arg);
1210 if (!pev->group)
1211 return -ENOMEM;
1212 *arg = ptr + 1;
1213 } else
1214 pev->group = NULL;
1215 if (!pev->sdt && !is_c_func_name(*arg)) {
1216 ng_name:
1217 semantic_error("%s is bad for event name -it must "
1218 "follow C symbol-naming rule.\n", *arg);
1219 return -EINVAL;
1220 }
1221 pev->event = strdup(*arg);
1222 if (pev->event == NULL)
1223 return -ENOMEM;
1224
1225 return 0;
1226 }
1227
1228 /* Parse probepoint definition. */
1229 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1230 {
1231 struct perf_probe_point *pp = &pev->point;
1232 char *ptr, *tmp;
1233 char c, nc = 0;
1234 bool file_spec = false;
1235 int ret;
1236
1237 /*
1238 * <Syntax>
1239 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1240 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1241 * perf probe %[GRP:]SDT_EVENT
1242 */
1243 if (!arg)
1244 return -EINVAL;
1245
1246 /*
1247 * If the probe point starts with '%',
1248 * or starts with "sdt_" and has a ':' but no '=',
1249 * then it should be a SDT/cached probe point.
1250 */
1251 if (arg[0] == '%' ||
1252 (!strncmp(arg, "sdt_", 4) &&
1253 !!strchr(arg, ':') && !strchr(arg, '='))) {
1254 pev->sdt = true;
1255 if (arg[0] == '%')
1256 arg++;
1257 }
1258
1259 ptr = strpbrk(arg, ";=@+%");
1260 if (pev->sdt) {
1261 if (ptr) {
1262 if (*ptr != '@') {
1263 semantic_error("%s must be an SDT name.\n",
1264 arg);
1265 return -EINVAL;
1266 }
1267 /* This must be a target file name or build id */
1268 tmp = build_id_cache__complement(ptr + 1);
1269 if (tmp) {
1270 pev->target = build_id_cache__origname(tmp);
1271 free(tmp);
1272 } else
1273 pev->target = strdup(ptr + 1);
1274 if (!pev->target)
1275 return -ENOMEM;
1276 *ptr = '\0';
1277 }
1278 ret = parse_perf_probe_event_name(&arg, pev);
1279 if (ret == 0) {
1280 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1281 ret = -errno;
1282 }
1283 return ret;
1284 }
1285
1286 if (ptr && *ptr == '=') { /* Event name */
1287 *ptr = '\0';
1288 tmp = ptr + 1;
1289 ret = parse_perf_probe_event_name(&arg, pev);
1290 if (ret < 0)
1291 return ret;
1292
1293 arg = tmp;
1294 }
1295
1296 /*
1297 * Check arg is function or file name and copy it.
1298 *
1299 * We consider arg to be a file spec if and only if it satisfies
1300 * all of the below criteria::
1301 * - it does not include any of "+@%",
1302 * - it includes one of ":;", and
1303 * - it has a period '.' in the name.
1304 *
1305 * Otherwise, we consider arg to be a function specification.
1306 */
1307 if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
1308 /* This is a file spec if it includes a '.' before ; or : */
1309 if (memchr(arg, '.', ptr - arg))
1310 file_spec = true;
1311 }
1312
1313 ptr = strpbrk(arg, ";:+@%");
1314 if (ptr) {
1315 nc = *ptr;
1316 *ptr++ = '\0';
1317 }
1318
1319 if (arg[0] == '\0')
1320 tmp = NULL;
1321 else {
1322 tmp = strdup(arg);
1323 if (tmp == NULL)
1324 return -ENOMEM;
1325 }
1326
1327 if (file_spec)
1328 pp->file = tmp;
1329 else {
1330 pp->function = tmp;
1331
1332 /*
1333 * Keep pp->function even if this is absolute address,
1334 * so it can mark whether abs_address is valid.
1335 * Which make 'perf probe lib.bin 0x0' possible.
1336 *
1337 * Note that checking length of tmp is not needed
1338 * because when we access tmp[1] we know tmp[0] is '0',
1339 * so tmp[1] should always valid (but could be '\0').
1340 */
1341 if (tmp && !strncmp(tmp, "0x", 2)) {
1342 pp->abs_address = strtoul(pp->function, &tmp, 0);
1343 if (*tmp != '\0') {
1344 semantic_error("Invalid absolute address.\n");
1345 return -EINVAL;
1346 }
1347 }
1348 }
1349
1350 /* Parse other options */
1351 while (ptr) {
1352 arg = ptr;
1353 c = nc;
1354 if (c == ';') { /* Lazy pattern must be the last part */
1355 pp->lazy_line = strdup(arg);
1356 if (pp->lazy_line == NULL)
1357 return -ENOMEM;
1358 break;
1359 }
1360 ptr = strpbrk(arg, ";:+@%");
1361 if (ptr) {
1362 nc = *ptr;
1363 *ptr++ = '\0';
1364 }
1365 switch (c) {
1366 case ':': /* Line number */
1367 pp->line = strtoul(arg, &tmp, 0);
1368 if (*tmp != '\0') {
1369 semantic_error("There is non-digit char"
1370 " in line number.\n");
1371 return -EINVAL;
1372 }
1373 break;
1374 case '+': /* Byte offset from a symbol */
1375 pp->offset = strtoul(arg, &tmp, 0);
1376 if (*tmp != '\0') {
1377 semantic_error("There is non-digit character"
1378 " in offset.\n");
1379 return -EINVAL;
1380 }
1381 break;
1382 case '@': /* File name */
1383 if (pp->file) {
1384 semantic_error("SRC@SRC is not allowed.\n");
1385 return -EINVAL;
1386 }
1387 pp->file = strdup(arg);
1388 if (pp->file == NULL)
1389 return -ENOMEM;
1390 break;
1391 case '%': /* Probe places */
1392 if (strcmp(arg, "return") == 0) {
1393 pp->retprobe = 1;
1394 } else { /* Others not supported yet */
1395 semantic_error("%%%s is not supported.\n", arg);
1396 return -ENOTSUP;
1397 }
1398 break;
1399 default: /* Buggy case */
1400 pr_err("This program has a bug at %s:%d.\n",
1401 __FILE__, __LINE__);
1402 return -ENOTSUP;
1403 break;
1404 }
1405 }
1406
1407 /* Exclusion check */
1408 if (pp->lazy_line && pp->line) {
1409 semantic_error("Lazy pattern can't be used with"
1410 " line number.\n");
1411 return -EINVAL;
1412 }
1413
1414 if (pp->lazy_line && pp->offset) {
1415 semantic_error("Lazy pattern can't be used with offset.\n");
1416 return -EINVAL;
1417 }
1418
1419 if (pp->line && pp->offset) {
1420 semantic_error("Offset can't be used with line number.\n");
1421 return -EINVAL;
1422 }
1423
1424 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1425 semantic_error("File always requires line number or "
1426 "lazy pattern.\n");
1427 return -EINVAL;
1428 }
1429
1430 if (pp->offset && !pp->function) {
1431 semantic_error("Offset requires an entry function.\n");
1432 return -EINVAL;
1433 }
1434
1435 if (pp->retprobe && !pp->function) {
1436 semantic_error("Return probe requires an entry function.\n");
1437 return -EINVAL;
1438 }
1439
1440 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1441 semantic_error("Offset/Line/Lazy pattern can't be used with "
1442 "return probe.\n");
1443 return -EINVAL;
1444 }
1445
1446 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1447 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1448 pp->lazy_line);
1449 return 0;
1450 }
1451
1452 /* Parse perf-probe event argument */
1453 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1454 {
1455 char *tmp, *goodname;
1456 struct perf_probe_arg_field **fieldp;
1457
1458 pr_debug("parsing arg: %s into ", str);
1459
1460 tmp = strchr(str, '=');
1461 if (tmp) {
1462 arg->name = strndup(str, tmp - str);
1463 if (arg->name == NULL)
1464 return -ENOMEM;
1465 pr_debug("name:%s ", arg->name);
1466 str = tmp + 1;
1467 }
1468
1469 tmp = strchr(str, ':');
1470 if (tmp) { /* Type setting */
1471 *tmp = '\0';
1472 arg->type = strdup(tmp + 1);
1473 if (arg->type == NULL)
1474 return -ENOMEM;
1475 pr_debug("type:%s ", arg->type);
1476 }
1477
1478 tmp = strpbrk(str, "-.[");
1479 if (!is_c_varname(str) || !tmp) {
1480 /* A variable, register, symbol or special value */
1481 arg->var = strdup(str);
1482 if (arg->var == NULL)
1483 return -ENOMEM;
1484 pr_debug("%s\n", arg->var);
1485 return 0;
1486 }
1487
1488 /* Structure fields or array element */
1489 arg->var = strndup(str, tmp - str);
1490 if (arg->var == NULL)
1491 return -ENOMEM;
1492 goodname = arg->var;
1493 pr_debug("%s, ", arg->var);
1494 fieldp = &arg->field;
1495
1496 do {
1497 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1498 if (*fieldp == NULL)
1499 return -ENOMEM;
1500 if (*tmp == '[') { /* Array */
1501 str = tmp;
1502 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1503 (*fieldp)->ref = true;
1504 if (*tmp != ']' || tmp == str + 1) {
1505 semantic_error("Array index must be a"
1506 " number.\n");
1507 return -EINVAL;
1508 }
1509 tmp++;
1510 if (*tmp == '\0')
1511 tmp = NULL;
1512 } else { /* Structure */
1513 if (*tmp == '.') {
1514 str = tmp + 1;
1515 (*fieldp)->ref = false;
1516 } else if (tmp[1] == '>') {
1517 str = tmp + 2;
1518 (*fieldp)->ref = true;
1519 } else {
1520 semantic_error("Argument parse error: %s\n",
1521 str);
1522 return -EINVAL;
1523 }
1524 tmp = strpbrk(str, "-.[");
1525 }
1526 if (tmp) {
1527 (*fieldp)->name = strndup(str, tmp - str);
1528 if ((*fieldp)->name == NULL)
1529 return -ENOMEM;
1530 if (*str != '[')
1531 goodname = (*fieldp)->name;
1532 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1533 fieldp = &(*fieldp)->next;
1534 }
1535 } while (tmp);
1536 (*fieldp)->name = strdup(str);
1537 if ((*fieldp)->name == NULL)
1538 return -ENOMEM;
1539 if (*str != '[')
1540 goodname = (*fieldp)->name;
1541 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1542
1543 /* If no name is specified, set the last field name (not array index)*/
1544 if (!arg->name) {
1545 arg->name = strdup(goodname);
1546 if (arg->name == NULL)
1547 return -ENOMEM;
1548 }
1549 return 0;
1550 }
1551
1552 /* Parse perf-probe event command */
1553 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1554 {
1555 char **argv;
1556 int argc, i, ret = 0;
1557
1558 argv = argv_split(cmd, &argc);
1559 if (!argv) {
1560 pr_debug("Failed to split arguments.\n");
1561 return -ENOMEM;
1562 }
1563 if (argc - 1 > MAX_PROBE_ARGS) {
1564 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1565 ret = -ERANGE;
1566 goto out;
1567 }
1568 /* Parse probe point */
1569 ret = parse_perf_probe_point(argv[0], pev);
1570 if (ret < 0)
1571 goto out;
1572
1573 /* Copy arguments and ensure return probe has no C argument */
1574 pev->nargs = argc - 1;
1575 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1576 if (pev->args == NULL) {
1577 ret = -ENOMEM;
1578 goto out;
1579 }
1580 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1581 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1582 if (ret >= 0 &&
1583 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1584 semantic_error("You can't specify local variable for"
1585 " kretprobe.\n");
1586 ret = -EINVAL;
1587 }
1588 }
1589 out:
1590 argv_free(argv);
1591
1592 return ret;
1593 }
1594
1595 /* Return true if this perf_probe_event requires debuginfo */
1596 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1597 {
1598 int i;
1599
1600 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1601 return true;
1602
1603 for (i = 0; i < pev->nargs; i++)
1604 if (is_c_varname(pev->args[i].var) ||
1605 !strcmp(pev->args[i].var, "$params") ||
1606 !strcmp(pev->args[i].var, "$vars"))
1607 return true;
1608
1609 return false;
1610 }
1611
1612 /* Parse probe_events event into struct probe_point */
1613 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1614 {
1615 struct probe_trace_point *tp = &tev->point;
1616 char pr;
1617 char *p;
1618 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1619 int ret, i, argc;
1620 char **argv;
1621
1622 pr_debug("Parsing probe_events: %s\n", cmd);
1623 argv = argv_split(cmd, &argc);
1624 if (!argv) {
1625 pr_debug("Failed to split arguments.\n");
1626 return -ENOMEM;
1627 }
1628 if (argc < 2) {
1629 semantic_error("Too few probe arguments.\n");
1630 ret = -ERANGE;
1631 goto out;
1632 }
1633
1634 /* Scan event and group name. */
1635 argv0_str = strdup(argv[0]);
1636 if (argv0_str == NULL) {
1637 ret = -ENOMEM;
1638 goto out;
1639 }
1640 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1641 fmt2_str = strtok_r(NULL, "/", &fmt);
1642 fmt3_str = strtok_r(NULL, " \t", &fmt);
1643 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1644 || fmt3_str == NULL) {
1645 semantic_error("Failed to parse event name: %s\n", argv[0]);
1646 ret = -EINVAL;
1647 goto out;
1648 }
1649 pr = fmt1_str[0];
1650 tev->group = strdup(fmt2_str);
1651 tev->event = strdup(fmt3_str);
1652 if (tev->group == NULL || tev->event == NULL) {
1653 ret = -ENOMEM;
1654 goto out;
1655 }
1656 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1657
1658 tp->retprobe = (pr == 'r');
1659
1660 /* Scan module name(if there), function name and offset */
1661 p = strchr(argv[1], ':');
1662 if (p) {
1663 tp->module = strndup(argv[1], p - argv[1]);
1664 if (!tp->module) {
1665 ret = -ENOMEM;
1666 goto out;
1667 }
1668 tev->uprobes = (tp->module[0] == '/');
1669 p++;
1670 } else
1671 p = argv[1];
1672 fmt1_str = strtok_r(p, "+", &fmt);
1673 /* only the address started with 0x */
1674 if (fmt1_str[0] == '0') {
1675 /*
1676 * Fix a special case:
1677 * if address == 0, kernel reports something like:
1678 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1679 * Newer kernel may fix that, but we want to
1680 * support old kernel also.
1681 */
1682 if (strcmp(fmt1_str, "0x") == 0) {
1683 if (!argv[2] || strcmp(argv[2], "(null)")) {
1684 ret = -EINVAL;
1685 goto out;
1686 }
1687 tp->address = 0;
1688
1689 free(argv[2]);
1690 for (i = 2; argv[i + 1] != NULL; i++)
1691 argv[i] = argv[i + 1];
1692
1693 argv[i] = NULL;
1694 argc -= 1;
1695 } else
1696 tp->address = strtoul(fmt1_str, NULL, 0);
1697 } else {
1698 /* Only the symbol-based probe has offset */
1699 tp->symbol = strdup(fmt1_str);
1700 if (tp->symbol == NULL) {
1701 ret = -ENOMEM;
1702 goto out;
1703 }
1704 fmt2_str = strtok_r(NULL, "", &fmt);
1705 if (fmt2_str == NULL)
1706 tp->offset = 0;
1707 else
1708 tp->offset = strtoul(fmt2_str, NULL, 10);
1709 }
1710
1711 tev->nargs = argc - 2;
1712 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1713 if (tev->args == NULL) {
1714 ret = -ENOMEM;
1715 goto out;
1716 }
1717 for (i = 0; i < tev->nargs; i++) {
1718 p = strchr(argv[i + 2], '=');
1719 if (p) /* We don't need which register is assigned. */
1720 *p++ = '\0';
1721 else
1722 p = argv[i + 2];
1723 tev->args[i].name = strdup(argv[i + 2]);
1724 /* TODO: parse regs and offset */
1725 tev->args[i].value = strdup(p);
1726 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1727 ret = -ENOMEM;
1728 goto out;
1729 }
1730 }
1731 ret = 0;
1732 out:
1733 free(argv0_str);
1734 argv_free(argv);
1735 return ret;
1736 }
1737
1738 /* Compose only probe arg */
1739 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1740 {
1741 struct perf_probe_arg_field *field = pa->field;
1742 struct strbuf buf;
1743 char *ret = NULL;
1744 int err;
1745
1746 if (strbuf_init(&buf, 64) < 0)
1747 return NULL;
1748
1749 if (pa->name && pa->var)
1750 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1751 else
1752 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1753 if (err)
1754 goto out;
1755
1756 while (field) {
1757 if (field->name[0] == '[')
1758 err = strbuf_addstr(&buf, field->name);
1759 else
1760 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1761 field->name);
1762 field = field->next;
1763 if (err)
1764 goto out;
1765 }
1766
1767 if (pa->type)
1768 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1769 goto out;
1770
1771 ret = strbuf_detach(&buf, NULL);
1772 out:
1773 strbuf_release(&buf);
1774 return ret;
1775 }
1776
1777 /* Compose only probe point (not argument) */
1778 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1779 {
1780 struct strbuf buf;
1781 char *tmp, *ret = NULL;
1782 int len, err = 0;
1783
1784 if (strbuf_init(&buf, 64) < 0)
1785 return NULL;
1786
1787 if (pp->function) {
1788 if (strbuf_addstr(&buf, pp->function) < 0)
1789 goto out;
1790 if (pp->offset)
1791 err = strbuf_addf(&buf, "+%lu", pp->offset);
1792 else if (pp->line)
1793 err = strbuf_addf(&buf, ":%d", pp->line);
1794 else if (pp->retprobe)
1795 err = strbuf_addstr(&buf, "%return");
1796 if (err)
1797 goto out;
1798 }
1799 if (pp->file) {
1800 tmp = pp->file;
1801 len = strlen(tmp);
1802 if (len > 30) {
1803 tmp = strchr(pp->file + len - 30, '/');
1804 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1805 }
1806 err = strbuf_addf(&buf, "@%s", tmp);
1807 if (!err && !pp->function && pp->line)
1808 err = strbuf_addf(&buf, ":%d", pp->line);
1809 }
1810 if (!err)
1811 ret = strbuf_detach(&buf, NULL);
1812 out:
1813 strbuf_release(&buf);
1814 return ret;
1815 }
1816
1817 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1818 {
1819 struct strbuf buf;
1820 char *tmp, *ret = NULL;
1821 int i;
1822
1823 if (strbuf_init(&buf, 64))
1824 return NULL;
1825 if (pev->event)
1826 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1827 pev->event) < 0)
1828 goto out;
1829
1830 tmp = synthesize_perf_probe_point(&pev->point);
1831 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1832 goto out;
1833 free(tmp);
1834
1835 for (i = 0; i < pev->nargs; i++) {
1836 tmp = synthesize_perf_probe_arg(pev->args + i);
1837 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1838 goto out;
1839 free(tmp);
1840 }
1841
1842 ret = strbuf_detach(&buf, NULL);
1843 out:
1844 strbuf_release(&buf);
1845 return ret;
1846 }
1847
1848 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1849 struct strbuf *buf, int depth)
1850 {
1851 int err;
1852 if (ref->next) {
1853 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1854 depth + 1);
1855 if (depth < 0)
1856 return depth;
1857 }
1858 err = strbuf_addf(buf, "%+ld(", ref->offset);
1859 return (err < 0) ? err : depth;
1860 }
1861
1862 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1863 struct strbuf *buf)
1864 {
1865 struct probe_trace_arg_ref *ref = arg->ref;
1866 int depth = 0, err;
1867
1868 /* Argument name or separator */
1869 if (arg->name)
1870 err = strbuf_addf(buf, " %s=", arg->name);
1871 else
1872 err = strbuf_addch(buf, ' ');
1873 if (err)
1874 return err;
1875
1876 /* Special case: @XXX */
1877 if (arg->value[0] == '@' && arg->ref)
1878 ref = ref->next;
1879
1880 /* Dereferencing arguments */
1881 if (ref) {
1882 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1883 if (depth < 0)
1884 return depth;
1885 }
1886
1887 /* Print argument value */
1888 if (arg->value[0] == '@' && arg->ref)
1889 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
1890 else
1891 err = strbuf_addstr(buf, arg->value);
1892
1893 /* Closing */
1894 while (!err && depth--)
1895 err = strbuf_addch(buf, ')');
1896
1897 /* Print argument type */
1898 if (!err && arg->type)
1899 err = strbuf_addf(buf, ":%s", arg->type);
1900
1901 return err;
1902 }
1903
1904 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1905 {
1906 struct probe_trace_point *tp = &tev->point;
1907 struct strbuf buf;
1908 char *ret = NULL;
1909 int i, err;
1910
1911 /* Uprobes must have tp->module */
1912 if (tev->uprobes && !tp->module)
1913 return NULL;
1914
1915 if (strbuf_init(&buf, 32) < 0)
1916 return NULL;
1917
1918 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
1919 tev->group, tev->event) < 0)
1920 goto error;
1921 /*
1922 * If tp->address == 0, then this point must be a
1923 * absolute address uprobe.
1924 * try_to_find_absolute_address() should have made
1925 * tp->symbol to "0x0".
1926 */
1927 if (tev->uprobes && !tp->address) {
1928 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
1929 goto error;
1930 }
1931
1932 /* Use the tp->address for uprobes */
1933 if (tev->uprobes)
1934 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
1935 else if (!strncmp(tp->symbol, "0x", 2))
1936 /* Absolute address. See try_to_find_absolute_address() */
1937 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
1938 tp->module ? ":" : "", tp->address);
1939 else
1940 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
1941 tp->module ? ":" : "", tp->symbol, tp->offset);
1942 if (err)
1943 goto error;
1944
1945 for (i = 0; i < tev->nargs; i++)
1946 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
1947 goto error;
1948
1949 ret = strbuf_detach(&buf, NULL);
1950 error:
1951 strbuf_release(&buf);
1952 return ret;
1953 }
1954
1955 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
1956 struct perf_probe_point *pp,
1957 bool is_kprobe)
1958 {
1959 struct symbol *sym = NULL;
1960 struct map *map;
1961 u64 addr = tp->address;
1962 int ret = -ENOENT;
1963
1964 if (!is_kprobe) {
1965 map = dso__new_map(tp->module);
1966 if (!map)
1967 goto out;
1968 sym = map__find_symbol(map, addr, NULL);
1969 } else {
1970 if (tp->symbol && !addr) {
1971 if (kernel_get_symbol_address_by_name(tp->symbol,
1972 &addr, true, false) < 0)
1973 goto out;
1974 }
1975 if (addr) {
1976 addr += tp->offset;
1977 sym = __find_kernel_function(addr, &map);
1978 }
1979 }
1980
1981 if (!sym)
1982 goto out;
1983
1984 pp->retprobe = tp->retprobe;
1985 pp->offset = addr - map->unmap_ip(map, sym->start);
1986 pp->function = strdup(sym->name);
1987 ret = pp->function ? 0 : -ENOMEM;
1988
1989 out:
1990 if (map && !is_kprobe) {
1991 map__put(map);
1992 }
1993
1994 return ret;
1995 }
1996
1997 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1998 struct perf_probe_point *pp,
1999 bool is_kprobe)
2000 {
2001 char buf[128];
2002 int ret;
2003
2004 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2005 if (!ret)
2006 return 0;
2007 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2008 if (!ret)
2009 return 0;
2010
2011 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2012
2013 if (tp->symbol) {
2014 pp->function = strdup(tp->symbol);
2015 pp->offset = tp->offset;
2016 } else {
2017 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2018 if (ret < 0)
2019 return ret;
2020 pp->function = strdup(buf);
2021 pp->offset = 0;
2022 }
2023 if (pp->function == NULL)
2024 return -ENOMEM;
2025
2026 pp->retprobe = tp->retprobe;
2027
2028 return 0;
2029 }
2030
2031 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2032 struct perf_probe_event *pev, bool is_kprobe)
2033 {
2034 struct strbuf buf = STRBUF_INIT;
2035 int i, ret;
2036
2037 /* Convert event/group name */
2038 pev->event = strdup(tev->event);
2039 pev->group = strdup(tev->group);
2040 if (pev->event == NULL || pev->group == NULL)
2041 return -ENOMEM;
2042
2043 /* Convert trace_point to probe_point */
2044 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2045 if (ret < 0)
2046 return ret;
2047
2048 /* Convert trace_arg to probe_arg */
2049 pev->nargs = tev->nargs;
2050 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2051 if (pev->args == NULL)
2052 return -ENOMEM;
2053 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2054 if (tev->args[i].name)
2055 pev->args[i].name = strdup(tev->args[i].name);
2056 else {
2057 if ((ret = strbuf_init(&buf, 32)) < 0)
2058 goto error;
2059 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2060 pev->args[i].name = strbuf_detach(&buf, NULL);
2061 }
2062 if (pev->args[i].name == NULL && ret >= 0)
2063 ret = -ENOMEM;
2064 }
2065 error:
2066 if (ret < 0)
2067 clear_perf_probe_event(pev);
2068
2069 return ret;
2070 }
2071
2072 void clear_perf_probe_event(struct perf_probe_event *pev)
2073 {
2074 struct perf_probe_arg_field *field, *next;
2075 int i;
2076
2077 free(pev->event);
2078 free(pev->group);
2079 free(pev->target);
2080 clear_perf_probe_point(&pev->point);
2081
2082 for (i = 0; i < pev->nargs; i++) {
2083 free(pev->args[i].name);
2084 free(pev->args[i].var);
2085 free(pev->args[i].type);
2086 field = pev->args[i].field;
2087 while (field) {
2088 next = field->next;
2089 zfree(&field->name);
2090 free(field);
2091 field = next;
2092 }
2093 }
2094 free(pev->args);
2095 memset(pev, 0, sizeof(*pev));
2096 }
2097
2098 #define strdup_or_goto(str, label) \
2099 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2100
2101 static int perf_probe_point__copy(struct perf_probe_point *dst,
2102 struct perf_probe_point *src)
2103 {
2104 dst->file = strdup_or_goto(src->file, out_err);
2105 dst->function = strdup_or_goto(src->function, out_err);
2106 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2107 dst->line = src->line;
2108 dst->retprobe = src->retprobe;
2109 dst->offset = src->offset;
2110 return 0;
2111
2112 out_err:
2113 clear_perf_probe_point(dst);
2114 return -ENOMEM;
2115 }
2116
2117 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2118 struct perf_probe_arg *src)
2119 {
2120 struct perf_probe_arg_field *field, **ppfield;
2121
2122 dst->name = strdup_or_goto(src->name, out_err);
2123 dst->var = strdup_or_goto(src->var, out_err);
2124 dst->type = strdup_or_goto(src->type, out_err);
2125
2126 field = src->field;
2127 ppfield = &(dst->field);
2128 while (field) {
2129 *ppfield = zalloc(sizeof(*field));
2130 if (!*ppfield)
2131 goto out_err;
2132 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2133 (*ppfield)->index = field->index;
2134 (*ppfield)->ref = field->ref;
2135 field = field->next;
2136 ppfield = &((*ppfield)->next);
2137 }
2138 return 0;
2139 out_err:
2140 return -ENOMEM;
2141 }
2142
2143 int perf_probe_event__copy(struct perf_probe_event *dst,
2144 struct perf_probe_event *src)
2145 {
2146 int i;
2147
2148 dst->event = strdup_or_goto(src->event, out_err);
2149 dst->group = strdup_or_goto(src->group, out_err);
2150 dst->target = strdup_or_goto(src->target, out_err);
2151 dst->uprobes = src->uprobes;
2152
2153 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2154 goto out_err;
2155
2156 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2157 if (!dst->args)
2158 goto out_err;
2159 dst->nargs = src->nargs;
2160
2161 for (i = 0; i < src->nargs; i++)
2162 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2163 goto out_err;
2164 return 0;
2165
2166 out_err:
2167 clear_perf_probe_event(dst);
2168 return -ENOMEM;
2169 }
2170
2171 void clear_probe_trace_event(struct probe_trace_event *tev)
2172 {
2173 struct probe_trace_arg_ref *ref, *next;
2174 int i;
2175
2176 free(tev->event);
2177 free(tev->group);
2178 free(tev->point.symbol);
2179 free(tev->point.realname);
2180 free(tev->point.module);
2181 for (i = 0; i < tev->nargs; i++) {
2182 free(tev->args[i].name);
2183 free(tev->args[i].value);
2184 free(tev->args[i].type);
2185 ref = tev->args[i].ref;
2186 while (ref) {
2187 next = ref->next;
2188 free(ref);
2189 ref = next;
2190 }
2191 }
2192 free(tev->args);
2193 memset(tev, 0, sizeof(*tev));
2194 }
2195
2196 struct kprobe_blacklist_node {
2197 struct list_head list;
2198 unsigned long start;
2199 unsigned long end;
2200 char *symbol;
2201 };
2202
2203 static void kprobe_blacklist__delete(struct list_head *blacklist)
2204 {
2205 struct kprobe_blacklist_node *node;
2206
2207 while (!list_empty(blacklist)) {
2208 node = list_first_entry(blacklist,
2209 struct kprobe_blacklist_node, list);
2210 list_del(&node->list);
2211 free(node->symbol);
2212 free(node);
2213 }
2214 }
2215
2216 static int kprobe_blacklist__load(struct list_head *blacklist)
2217 {
2218 struct kprobe_blacklist_node *node;
2219 const char *__debugfs = debugfs__mountpoint();
2220 char buf[PATH_MAX], *p;
2221 FILE *fp;
2222 int ret;
2223
2224 if (__debugfs == NULL)
2225 return -ENOTSUP;
2226
2227 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2228 if (ret < 0)
2229 return ret;
2230
2231 fp = fopen(buf, "r");
2232 if (!fp)
2233 return -errno;
2234
2235 ret = 0;
2236 while (fgets(buf, PATH_MAX, fp)) {
2237 node = zalloc(sizeof(*node));
2238 if (!node) {
2239 ret = -ENOMEM;
2240 break;
2241 }
2242 INIT_LIST_HEAD(&node->list);
2243 list_add_tail(&node->list, blacklist);
2244 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2245 ret = -EINVAL;
2246 break;
2247 }
2248 p = strchr(buf, '\t');
2249 if (p) {
2250 p++;
2251 if (p[strlen(p) - 1] == '\n')
2252 p[strlen(p) - 1] = '\0';
2253 } else
2254 p = (char *)"unknown";
2255 node->symbol = strdup(p);
2256 if (!node->symbol) {
2257 ret = -ENOMEM;
2258 break;
2259 }
2260 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2261 node->start, node->end, node->symbol);
2262 ret++;
2263 }
2264 if (ret < 0)
2265 kprobe_blacklist__delete(blacklist);
2266 fclose(fp);
2267
2268 return ret;
2269 }
2270
2271 static struct kprobe_blacklist_node *
2272 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2273 unsigned long address)
2274 {
2275 struct kprobe_blacklist_node *node;
2276
2277 list_for_each_entry(node, blacklist, list) {
2278 if (node->start <= address && address <= node->end)
2279 return node;
2280 }
2281
2282 return NULL;
2283 }
2284
2285 static LIST_HEAD(kprobe_blacklist);
2286
2287 static void kprobe_blacklist__init(void)
2288 {
2289 if (!list_empty(&kprobe_blacklist))
2290 return;
2291
2292 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2293 pr_debug("No kprobe blacklist support, ignored\n");
2294 }
2295
2296 static void kprobe_blacklist__release(void)
2297 {
2298 kprobe_blacklist__delete(&kprobe_blacklist);
2299 }
2300
2301 static bool kprobe_blacklist__listed(unsigned long address)
2302 {
2303 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2304 }
2305
2306 static int perf_probe_event__sprintf(const char *group, const char *event,
2307 struct perf_probe_event *pev,
2308 const char *module,
2309 struct strbuf *result)
2310 {
2311 int i, ret;
2312 char *buf;
2313
2314 if (asprintf(&buf, "%s:%s", group, event) < 0)
2315 return -errno;
2316 ret = strbuf_addf(result, " %-20s (on ", buf);
2317 free(buf);
2318 if (ret)
2319 return ret;
2320
2321 /* Synthesize only event probe point */
2322 buf = synthesize_perf_probe_point(&pev->point);
2323 if (!buf)
2324 return -ENOMEM;
2325 ret = strbuf_addstr(result, buf);
2326 free(buf);
2327
2328 if (!ret && module)
2329 ret = strbuf_addf(result, " in %s", module);
2330
2331 if (!ret && pev->nargs > 0) {
2332 ret = strbuf_add(result, " with", 5);
2333 for (i = 0; !ret && i < pev->nargs; i++) {
2334 buf = synthesize_perf_probe_arg(&pev->args[i]);
2335 if (!buf)
2336 return -ENOMEM;
2337 ret = strbuf_addf(result, " %s", buf);
2338 free(buf);
2339 }
2340 }
2341 if (!ret)
2342 ret = strbuf_addch(result, ')');
2343
2344 return ret;
2345 }
2346
2347 /* Show an event */
2348 int show_perf_probe_event(const char *group, const char *event,
2349 struct perf_probe_event *pev,
2350 const char *module, bool use_stdout)
2351 {
2352 struct strbuf buf = STRBUF_INIT;
2353 int ret;
2354
2355 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2356 if (ret >= 0) {
2357 if (use_stdout)
2358 printf("%s\n", buf.buf);
2359 else
2360 pr_info("%s\n", buf.buf);
2361 }
2362 strbuf_release(&buf);
2363
2364 return ret;
2365 }
2366
2367 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2368 struct strfilter *filter)
2369 {
2370 char tmp[128];
2371
2372 /* At first, check the event name itself */
2373 if (strfilter__compare(filter, tev->event))
2374 return true;
2375
2376 /* Next, check the combination of name and group */
2377 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2378 return false;
2379 return strfilter__compare(filter, tmp);
2380 }
2381
2382 static int __show_perf_probe_events(int fd, bool is_kprobe,
2383 struct strfilter *filter)
2384 {
2385 int ret = 0;
2386 struct probe_trace_event tev;
2387 struct perf_probe_event pev;
2388 struct strlist *rawlist;
2389 struct str_node *ent;
2390
2391 memset(&tev, 0, sizeof(tev));
2392 memset(&pev, 0, sizeof(pev));
2393
2394 rawlist = probe_file__get_rawlist(fd);
2395 if (!rawlist)
2396 return -ENOMEM;
2397
2398 strlist__for_each_entry(ent, rawlist) {
2399 ret = parse_probe_trace_command(ent->s, &tev);
2400 if (ret >= 0) {
2401 if (!filter_probe_trace_event(&tev, filter))
2402 goto next;
2403 ret = convert_to_perf_probe_event(&tev, &pev,
2404 is_kprobe);
2405 if (ret < 0)
2406 goto next;
2407 ret = show_perf_probe_event(pev.group, pev.event,
2408 &pev, tev.point.module,
2409 true);
2410 }
2411 next:
2412 clear_perf_probe_event(&pev);
2413 clear_probe_trace_event(&tev);
2414 if (ret < 0)
2415 break;
2416 }
2417 strlist__delete(rawlist);
2418 /* Cleanup cached debuginfo if needed */
2419 debuginfo_cache__exit();
2420
2421 return ret;
2422 }
2423
2424 /* List up current perf-probe events */
2425 int show_perf_probe_events(struct strfilter *filter)
2426 {
2427 int kp_fd, up_fd, ret;
2428
2429 setup_pager();
2430
2431 if (probe_conf.cache)
2432 return probe_cache__show_all_caches(filter);
2433
2434 ret = init_probe_symbol_maps(false);
2435 if (ret < 0)
2436 return ret;
2437
2438 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2439 if (ret < 0)
2440 return ret;
2441
2442 if (kp_fd >= 0)
2443 ret = __show_perf_probe_events(kp_fd, true, filter);
2444 if (up_fd >= 0 && ret >= 0)
2445 ret = __show_perf_probe_events(up_fd, false, filter);
2446 if (kp_fd > 0)
2447 close(kp_fd);
2448 if (up_fd > 0)
2449 close(up_fd);
2450 exit_probe_symbol_maps();
2451
2452 return ret;
2453 }
2454
2455 static int get_new_event_name(char *buf, size_t len, const char *base,
2456 struct strlist *namelist, bool allow_suffix)
2457 {
2458 int i, ret;
2459 char *p, *nbase;
2460
2461 if (*base == '.')
2462 base++;
2463 nbase = strdup(base);
2464 if (!nbase)
2465 return -ENOMEM;
2466
2467 /* Cut off the dot suffixes (e.g. .const, .isra)*/
2468 p = strchr(nbase, '.');
2469 if (p && p != nbase)
2470 *p = '\0';
2471
2472 /* Try no suffix number */
2473 ret = e_snprintf(buf, len, "%s", nbase);
2474 if (ret < 0) {
2475 pr_debug("snprintf() failed: %d\n", ret);
2476 goto out;
2477 }
2478 if (!strlist__has_entry(namelist, buf))
2479 goto out;
2480
2481 if (!allow_suffix) {
2482 pr_warning("Error: event \"%s\" already exists.\n"
2483 " Hint: Remove existing event by 'perf probe -d'\n"
2484 " or force duplicates by 'perf probe -f'\n"
2485 " or set 'force=yes' in BPF source.\n",
2486 buf);
2487 ret = -EEXIST;
2488 goto out;
2489 }
2490
2491 /* Try to add suffix */
2492 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2493 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2494 if (ret < 0) {
2495 pr_debug("snprintf() failed: %d\n", ret);
2496 goto out;
2497 }
2498 if (!strlist__has_entry(namelist, buf))
2499 break;
2500 }
2501 if (i == MAX_EVENT_INDEX) {
2502 pr_warning("Too many events are on the same function.\n");
2503 ret = -ERANGE;
2504 }
2505
2506 out:
2507 free(nbase);
2508 return ret;
2509 }
2510
2511 /* Warn if the current kernel's uprobe implementation is old */
2512 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2513 {
2514 int i;
2515 char *buf = synthesize_probe_trace_command(tev);
2516
2517 /* Old uprobe event doesn't support memory dereference */
2518 if (!tev->uprobes || tev->nargs == 0 || !buf)
2519 goto out;
2520
2521 for (i = 0; i < tev->nargs; i++)
2522 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2523 pr_warning("Please upgrade your kernel to at least "
2524 "3.14 to have access to feature %s\n",
2525 tev->args[i].value);
2526 break;
2527 }
2528 out:
2529 free(buf);
2530 }
2531
2532 /* Set new name from original perf_probe_event and namelist */
2533 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2534 struct perf_probe_event *pev,
2535 struct strlist *namelist,
2536 bool allow_suffix)
2537 {
2538 const char *event, *group;
2539 char buf[64];
2540 int ret;
2541
2542 /* If probe_event or trace_event already have the name, reuse it */
2543 if (pev->event && !pev->sdt)
2544 event = pev->event;
2545 else if (tev->event)
2546 event = tev->event;
2547 else {
2548 /* Or generate new one from probe point */
2549 if (pev->point.function &&
2550 (strncmp(pev->point.function, "0x", 2) != 0) &&
2551 !strisglob(pev->point.function))
2552 event = pev->point.function;
2553 else
2554 event = tev->point.realname;
2555 }
2556 if (pev->group && !pev->sdt)
2557 group = pev->group;
2558 else if (tev->group)
2559 group = tev->group;
2560 else
2561 group = PERFPROBE_GROUP;
2562
2563 /* Get an unused new event name */
2564 ret = get_new_event_name(buf, 64, event,
2565 namelist, allow_suffix);
2566 if (ret < 0)
2567 return ret;
2568
2569 event = buf;
2570
2571 tev->event = strdup(event);
2572 tev->group = strdup(group);
2573 if (tev->event == NULL || tev->group == NULL)
2574 return -ENOMEM;
2575
2576 /* Add added event name to namelist */
2577 strlist__add(namelist, event);
2578 return 0;
2579 }
2580
2581 static int __open_probe_file_and_namelist(bool uprobe,
2582 struct strlist **namelist)
2583 {
2584 int fd;
2585
2586 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2587 if (fd < 0)
2588 return fd;
2589
2590 /* Get current event names */
2591 *namelist = probe_file__get_namelist(fd);
2592 if (!(*namelist)) {
2593 pr_debug("Failed to get current event list.\n");
2594 close(fd);
2595 return -ENOMEM;
2596 }
2597 return fd;
2598 }
2599
2600 static int __add_probe_trace_events(struct perf_probe_event *pev,
2601 struct probe_trace_event *tevs,
2602 int ntevs, bool allow_suffix)
2603 {
2604 int i, fd[2] = {-1, -1}, up, ret;
2605 struct probe_trace_event *tev = NULL;
2606 struct probe_cache *cache = NULL;
2607 struct strlist *namelist[2] = {NULL, NULL};
2608
2609 up = pev->uprobes ? 1 : 0;
2610 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2611 if (fd[up] < 0)
2612 return fd[up];
2613
2614 ret = 0;
2615 for (i = 0; i < ntevs; i++) {
2616 tev = &tevs[i];
2617 up = tev->uprobes ? 1 : 0;
2618 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2619 fd[up] = __open_probe_file_and_namelist(up,
2620 &namelist[up]);
2621 if (fd[up] < 0)
2622 goto close_out;
2623 }
2624 /* Skip if the symbol is out of .text or blacklisted */
2625 if (!tev->point.symbol && !pev->uprobes)
2626 continue;
2627
2628 /* Set new name for tev (and update namelist) */
2629 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2630 allow_suffix);
2631 if (ret < 0)
2632 break;
2633
2634 ret = probe_file__add_event(fd[up], tev);
2635 if (ret < 0)
2636 break;
2637
2638 /*
2639 * Probes after the first probe which comes from same
2640 * user input are always allowed to add suffix, because
2641 * there might be several addresses corresponding to
2642 * one code line.
2643 */
2644 allow_suffix = true;
2645 }
2646 if (ret == -EINVAL && pev->uprobes)
2647 warn_uprobe_event_compat(tev);
2648 if (ret == 0 && probe_conf.cache) {
2649 cache = probe_cache__new(pev->target);
2650 if (!cache ||
2651 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2652 probe_cache__commit(cache) < 0)
2653 pr_warning("Failed to add event to probe cache\n");
2654 probe_cache__delete(cache);
2655 }
2656
2657 close_out:
2658 for (up = 0; up < 2; up++) {
2659 strlist__delete(namelist[up]);
2660 if (fd[up] >= 0)
2661 close(fd[up]);
2662 }
2663 return ret;
2664 }
2665
2666 static int find_probe_functions(struct map *map, char *name,
2667 struct symbol **syms)
2668 {
2669 int found = 0;
2670 struct symbol *sym;
2671 struct rb_node *tmp;
2672
2673 if (map__load(map, NULL) < 0)
2674 return 0;
2675
2676 map__for_each_symbol(map, sym, tmp) {
2677 if (strglobmatch(sym->name, name)) {
2678 found++;
2679 if (syms && found < probe_conf.max_probes)
2680 syms[found - 1] = sym;
2681 }
2682 }
2683
2684 return found;
2685 }
2686
2687 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2688 struct probe_trace_event *tev __maybe_unused,
2689 struct map *map __maybe_unused,
2690 struct symbol *sym __maybe_unused) { }
2691
2692 /*
2693 * Find probe function addresses from map.
2694 * Return an error or the number of found probe_trace_event
2695 */
2696 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2697 struct probe_trace_event **tevs)
2698 {
2699 struct map *map = NULL;
2700 struct ref_reloc_sym *reloc_sym = NULL;
2701 struct symbol *sym;
2702 struct symbol **syms = NULL;
2703 struct probe_trace_event *tev;
2704 struct perf_probe_point *pp = &pev->point;
2705 struct probe_trace_point *tp;
2706 int num_matched_functions;
2707 int ret, i, j, skipped = 0;
2708 char *mod_name;
2709
2710 map = get_target_map(pev->target, pev->uprobes);
2711 if (!map) {
2712 ret = -EINVAL;
2713 goto out;
2714 }
2715
2716 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2717 if (!syms) {
2718 ret = -ENOMEM;
2719 goto out;
2720 }
2721
2722 /*
2723 * Load matched symbols: Since the different local symbols may have
2724 * same name but different addresses, this lists all the symbols.
2725 */
2726 num_matched_functions = find_probe_functions(map, pp->function, syms);
2727 if (num_matched_functions == 0) {
2728 pr_err("Failed to find symbol %s in %s\n", pp->function,
2729 pev->target ? : "kernel");
2730 ret = -ENOENT;
2731 goto out;
2732 } else if (num_matched_functions > probe_conf.max_probes) {
2733 pr_err("Too many functions matched in %s\n",
2734 pev->target ? : "kernel");
2735 ret = -E2BIG;
2736 goto out;
2737 }
2738
2739 /* Note that the symbols in the kmodule are not relocated */
2740 if (!pev->uprobes && !pp->retprobe && !pev->target) {
2741 reloc_sym = kernel_get_ref_reloc_sym();
2742 if (!reloc_sym) {
2743 pr_warning("Relocated base symbol is not found!\n");
2744 ret = -EINVAL;
2745 goto out;
2746 }
2747 }
2748
2749 /* Setup result trace-probe-events */
2750 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2751 if (!*tevs) {
2752 ret = -ENOMEM;
2753 goto out;
2754 }
2755
2756 ret = 0;
2757
2758 for (j = 0; j < num_matched_functions; j++) {
2759 sym = syms[j];
2760
2761 tev = (*tevs) + ret;
2762 tp = &tev->point;
2763 if (ret == num_matched_functions) {
2764 pr_warning("Too many symbols are listed. Skip it.\n");
2765 break;
2766 }
2767 ret++;
2768
2769 if (pp->offset > sym->end - sym->start) {
2770 pr_warning("Offset %ld is bigger than the size of %s\n",
2771 pp->offset, sym->name);
2772 ret = -ENOENT;
2773 goto err_out;
2774 }
2775 /* Add one probe point */
2776 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2777
2778 /* Check the kprobe (not in module) is within .text */
2779 if (!pev->uprobes && !pev->target &&
2780 kprobe_warn_out_range(sym->name, tp->address)) {
2781 tp->symbol = NULL; /* Skip it */
2782 skipped++;
2783 } else if (reloc_sym) {
2784 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2785 tp->offset = tp->address - reloc_sym->addr;
2786 } else {
2787 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2788 tp->offset = pp->offset;
2789 }
2790 tp->realname = strdup_or_goto(sym->name, nomem_out);
2791
2792 tp->retprobe = pp->retprobe;
2793 if (pev->target) {
2794 if (pev->uprobes) {
2795 tev->point.module = strdup_or_goto(pev->target,
2796 nomem_out);
2797 } else {
2798 mod_name = find_module_name(pev->target);
2799 tev->point.module =
2800 strdup(mod_name ? mod_name : pev->target);
2801 free(mod_name);
2802 if (!tev->point.module)
2803 goto nomem_out;
2804 }
2805 }
2806 tev->uprobes = pev->uprobes;
2807 tev->nargs = pev->nargs;
2808 if (tev->nargs) {
2809 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2810 tev->nargs);
2811 if (tev->args == NULL)
2812 goto nomem_out;
2813 }
2814 for (i = 0; i < tev->nargs; i++) {
2815 if (pev->args[i].name)
2816 tev->args[i].name =
2817 strdup_or_goto(pev->args[i].name,
2818 nomem_out);
2819
2820 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2821 nomem_out);
2822 if (pev->args[i].type)
2823 tev->args[i].type =
2824 strdup_or_goto(pev->args[i].type,
2825 nomem_out);
2826 }
2827 arch__fix_tev_from_maps(pev, tev, map, sym);
2828 }
2829 if (ret == skipped) {
2830 ret = -ENOENT;
2831 goto err_out;
2832 }
2833
2834 out:
2835 put_target_map(map, pev->uprobes);
2836 free(syms);
2837 return ret;
2838
2839 nomem_out:
2840 ret = -ENOMEM;
2841 err_out:
2842 clear_probe_trace_events(*tevs, num_matched_functions);
2843 zfree(tevs);
2844 goto out;
2845 }
2846
2847 static int try_to_find_absolute_address(struct perf_probe_event *pev,
2848 struct probe_trace_event **tevs)
2849 {
2850 struct perf_probe_point *pp = &pev->point;
2851 struct probe_trace_event *tev;
2852 struct probe_trace_point *tp;
2853 int i, err;
2854
2855 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
2856 return -EINVAL;
2857 if (perf_probe_event_need_dwarf(pev))
2858 return -EINVAL;
2859
2860 /*
2861 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
2862 * absolute address.
2863 *
2864 * Only one tev can be generated by this.
2865 */
2866 *tevs = zalloc(sizeof(*tev));
2867 if (!*tevs)
2868 return -ENOMEM;
2869
2870 tev = *tevs;
2871 tp = &tev->point;
2872
2873 /*
2874 * Don't use tp->offset, use address directly, because
2875 * in synthesize_probe_trace_command() address cannot be
2876 * zero.
2877 */
2878 tp->address = pev->point.abs_address;
2879 tp->retprobe = pp->retprobe;
2880 tev->uprobes = pev->uprobes;
2881
2882 err = -ENOMEM;
2883 /*
2884 * Give it a '0x' leading symbol name.
2885 * In __add_probe_trace_events, a NULL symbol is interpreted as
2886 * invalud.
2887 */
2888 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
2889 goto errout;
2890
2891 /* For kprobe, check range */
2892 if ((!tev->uprobes) &&
2893 (kprobe_warn_out_range(tev->point.symbol,
2894 tev->point.address))) {
2895 err = -EACCES;
2896 goto errout;
2897 }
2898
2899 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
2900 goto errout;
2901
2902 if (pev->target) {
2903 tp->module = strdup(pev->target);
2904 if (!tp->module)
2905 goto errout;
2906 }
2907
2908 if (tev->group) {
2909 tev->group = strdup(pev->group);
2910 if (!tev->group)
2911 goto errout;
2912 }
2913
2914 if (pev->event) {
2915 tev->event = strdup(pev->event);
2916 if (!tev->event)
2917 goto errout;
2918 }
2919
2920 tev->nargs = pev->nargs;
2921 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
2922 if (!tev->args) {
2923 err = -ENOMEM;
2924 goto errout;
2925 }
2926 for (i = 0; i < tev->nargs; i++)
2927 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
2928
2929 return 1;
2930
2931 errout:
2932 if (*tevs) {
2933 clear_probe_trace_events(*tevs, 1);
2934 *tevs = NULL;
2935 }
2936 return err;
2937 }
2938
2939 bool __weak arch__prefers_symtab(void) { return false; }
2940
2941 /* Concatinate two arrays */
2942 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
2943 {
2944 void *ret;
2945
2946 ret = malloc(sz_a + sz_b);
2947 if (ret) {
2948 memcpy(ret, a, sz_a);
2949 memcpy(ret + sz_a, b, sz_b);
2950 }
2951 return ret;
2952 }
2953
2954 static int
2955 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
2956 struct probe_trace_event **tevs2, int ntevs2)
2957 {
2958 struct probe_trace_event *new_tevs;
2959 int ret = 0;
2960
2961 if (ntevs == 0) {
2962 *tevs = *tevs2;
2963 *ntevs = ntevs2;
2964 *tevs2 = NULL;
2965 return 0;
2966 }
2967
2968 if (*ntevs + ntevs2 > probe_conf.max_probes)
2969 ret = -E2BIG;
2970 else {
2971 /* Concatinate the array of probe_trace_event */
2972 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
2973 *tevs2, ntevs2 * sizeof(**tevs2));
2974 if (!new_tevs)
2975 ret = -ENOMEM;
2976 else {
2977 free(*tevs);
2978 *tevs = new_tevs;
2979 *ntevs += ntevs2;
2980 }
2981 }
2982 if (ret < 0)
2983 clear_probe_trace_events(*tevs2, ntevs2);
2984 zfree(tevs2);
2985
2986 return ret;
2987 }
2988
2989 /*
2990 * Try to find probe_trace_event from given probe caches. Return the number
2991 * of cached events found, if an error occurs return the error.
2992 */
2993 static int find_cached_events(struct perf_probe_event *pev,
2994 struct probe_trace_event **tevs,
2995 const char *target)
2996 {
2997 struct probe_cache *cache;
2998 struct probe_cache_entry *entry;
2999 struct probe_trace_event *tmp_tevs = NULL;
3000 int ntevs = 0;
3001 int ret = 0;
3002
3003 cache = probe_cache__new(target);
3004 /* Return 0 ("not found") if the target has no probe cache. */
3005 if (!cache)
3006 return 0;
3007
3008 for_each_probe_cache_entry(entry, cache) {
3009 /* Skip the cache entry which has no name */
3010 if (!entry->pev.event || !entry->pev.group)
3011 continue;
3012 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3013 strglobmatch(entry->pev.event, pev->event)) {
3014 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3015 if (ret > 0)
3016 ret = concat_probe_trace_events(tevs, &ntevs,
3017 &tmp_tevs, ret);
3018 if (ret < 0)
3019 break;
3020 }
3021 }
3022 probe_cache__delete(cache);
3023 if (ret < 0) {
3024 clear_probe_trace_events(*tevs, ntevs);
3025 zfree(tevs);
3026 } else {
3027 ret = ntevs;
3028 if (ntevs > 0 && target && target[0] == '/')
3029 pev->uprobes = true;
3030 }
3031
3032 return ret;
3033 }
3034
3035 /* Try to find probe_trace_event from all probe caches */
3036 static int find_cached_events_all(struct perf_probe_event *pev,
3037 struct probe_trace_event **tevs)
3038 {
3039 struct probe_trace_event *tmp_tevs = NULL;
3040 struct strlist *bidlist;
3041 struct str_node *nd;
3042 char *pathname;
3043 int ntevs = 0;
3044 int ret;
3045
3046 /* Get the buildid list of all valid caches */
3047 bidlist = build_id_cache__list_all(true);
3048 if (!bidlist) {
3049 ret = -errno;
3050 pr_debug("Failed to get buildids: %d\n", ret);
3051 return ret;
3052 }
3053
3054 ret = 0;
3055 strlist__for_each_entry(nd, bidlist) {
3056 pathname = build_id_cache__origname(nd->s);
3057 ret = find_cached_events(pev, &tmp_tevs, pathname);
3058 /* In the case of cnt == 0, we just skip it */
3059 if (ret > 0)
3060 ret = concat_probe_trace_events(tevs, &ntevs,
3061 &tmp_tevs, ret);
3062 free(pathname);
3063 if (ret < 0)
3064 break;
3065 }
3066 strlist__delete(bidlist);
3067
3068 if (ret < 0) {
3069 clear_probe_trace_events(*tevs, ntevs);
3070 zfree(tevs);
3071 } else
3072 ret = ntevs;
3073
3074 return ret;
3075 }
3076
3077 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3078 struct probe_trace_event **tevs)
3079 {
3080 struct probe_cache *cache;
3081 struct probe_cache_entry *entry;
3082 struct probe_trace_event *tev;
3083 struct str_node *node;
3084 int ret, i;
3085
3086 if (pev->sdt) {
3087 /* For SDT/cached events, we use special search functions */
3088 if (!pev->target)
3089 return find_cached_events_all(pev, tevs);
3090 else
3091 return find_cached_events(pev, tevs, pev->target);
3092 }
3093 cache = probe_cache__new(pev->target);
3094 if (!cache)
3095 return 0;
3096
3097 entry = probe_cache__find(cache, pev);
3098 if (!entry) {
3099 /* SDT must be in the cache */
3100 ret = pev->sdt ? -ENOENT : 0;
3101 goto out;
3102 }
3103
3104 ret = strlist__nr_entries(entry->tevlist);
3105 if (ret > probe_conf.max_probes) {
3106 pr_debug("Too many entries matched in the cache of %s\n",
3107 pev->target ? : "kernel");
3108 ret = -E2BIG;
3109 goto out;
3110 }
3111
3112 *tevs = zalloc(ret * sizeof(*tev));
3113 if (!*tevs) {
3114 ret = -ENOMEM;
3115 goto out;
3116 }
3117
3118 i = 0;
3119 strlist__for_each_entry(node, entry->tevlist) {
3120 tev = &(*tevs)[i++];
3121 ret = parse_probe_trace_command(node->s, tev);
3122 if (ret < 0)
3123 goto out;
3124 /* Set the uprobes attribute as same as original */
3125 tev->uprobes = pev->uprobes;
3126 }
3127 ret = i;
3128
3129 out:
3130 probe_cache__delete(cache);
3131 return ret;
3132 }
3133
3134 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3135 struct probe_trace_event **tevs)
3136 {
3137 int ret;
3138
3139 if (!pev->group && !pev->sdt) {
3140 /* Set group name if not given */
3141 if (!pev->uprobes) {
3142 pev->group = strdup(PERFPROBE_GROUP);
3143 ret = pev->group ? 0 : -ENOMEM;
3144 } else
3145 ret = convert_exec_to_group(pev->target, &pev->group);
3146 if (ret != 0) {
3147 pr_warning("Failed to make a group name.\n");
3148 return ret;
3149 }
3150 }
3151
3152 ret = try_to_find_absolute_address(pev, tevs);
3153 if (ret > 0)
3154 return ret;
3155
3156 /* At first, we need to lookup cache entry */
3157 ret = find_probe_trace_events_from_cache(pev, tevs);
3158 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3159 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3160
3161 if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
3162 ret = find_probe_trace_events_from_map(pev, tevs);
3163 if (ret > 0)
3164 return ret; /* Found in symbol table */
3165 }
3166
3167 /* Convert perf_probe_event with debuginfo */
3168 ret = try_to_find_probe_trace_events(pev, tevs);
3169 if (ret != 0)
3170 return ret; /* Found in debuginfo or got an error */
3171
3172 return find_probe_trace_events_from_map(pev, tevs);
3173 }
3174
3175 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3176 {
3177 int i, ret;
3178
3179 /* Loop 1: convert all events */
3180 for (i = 0; i < npevs; i++) {
3181 /* Init kprobe blacklist if needed */
3182 if (!pevs[i].uprobes)
3183 kprobe_blacklist__init();
3184 /* Convert with or without debuginfo */
3185 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3186 if (ret < 0)
3187 return ret;
3188 pevs[i].ntevs = ret;
3189 }
3190 /* This just release blacklist only if allocated */
3191 kprobe_blacklist__release();
3192
3193 return 0;
3194 }
3195
3196 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3197 {
3198 int i, ret = 0;
3199
3200 /* Loop 2: add all events */
3201 for (i = 0; i < npevs; i++) {
3202 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3203 pevs[i].ntevs,
3204 probe_conf.force_add);
3205 if (ret < 0)
3206 break;
3207 }
3208 return ret;
3209 }
3210
3211 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3212 {
3213 int i, j;
3214
3215 /* Loop 3: cleanup and free trace events */
3216 for (i = 0; i < npevs; i++) {
3217 for (j = 0; j < pevs[i].ntevs; j++)
3218 clear_probe_trace_event(&pevs[i].tevs[j]);
3219 zfree(&pevs[i].tevs);
3220 pevs[i].ntevs = 0;
3221 clear_perf_probe_event(&pevs[i]);
3222 }
3223 }
3224
3225 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3226 {
3227 int ret;
3228
3229 ret = init_probe_symbol_maps(pevs->uprobes);
3230 if (ret < 0)
3231 return ret;
3232
3233 ret = convert_perf_probe_events(pevs, npevs);
3234 if (ret == 0)
3235 ret = apply_perf_probe_events(pevs, npevs);
3236
3237 cleanup_perf_probe_events(pevs, npevs);
3238
3239 exit_probe_symbol_maps();
3240 return ret;
3241 }
3242
3243 int del_perf_probe_events(struct strfilter *filter)
3244 {
3245 int ret, ret2, ufd = -1, kfd = -1;
3246 char *str = strfilter__string(filter);
3247
3248 if (!str)
3249 return -EINVAL;
3250
3251 /* Get current event names */
3252 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3253 if (ret < 0)
3254 goto out;
3255
3256 ret = probe_file__del_events(kfd, filter);
3257 if (ret < 0 && ret != -ENOENT)
3258 goto error;
3259
3260 ret2 = probe_file__del_events(ufd, filter);
3261 if (ret2 < 0 && ret2 != -ENOENT) {
3262 ret = ret2;
3263 goto error;
3264 }
3265 ret = 0;
3266
3267 error:
3268 if (kfd >= 0)
3269 close(kfd);
3270 if (ufd >= 0)
3271 close(ufd);
3272 out:
3273 free(str);
3274
3275 return ret;
3276 }
3277
3278 /* TODO: don't use a global variable for filter ... */
3279 static struct strfilter *available_func_filter;
3280
3281 /*
3282 * If a symbol corresponds to a function with global binding and
3283 * matches filter return 0. For all others return 1.
3284 */
3285 static int filter_available_functions(struct map *map __maybe_unused,
3286 struct symbol *sym)
3287 {
3288 if (strfilter__compare(available_func_filter, sym->name))
3289 return 0;
3290 return 1;
3291 }
3292
3293 int show_available_funcs(const char *target, struct strfilter *_filter,
3294 bool user)
3295 {
3296 struct map *map;
3297 int ret;
3298
3299 ret = init_probe_symbol_maps(user);
3300 if (ret < 0)
3301 return ret;
3302
3303 /* Get a symbol map */
3304 if (user)
3305 map = dso__new_map(target);
3306 else
3307 map = kernel_get_module_map(target);
3308 if (!map) {
3309 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3310 return -EINVAL;
3311 }
3312
3313 /* Load symbols with given filter */
3314 available_func_filter = _filter;
3315 ret = map__load(map, filter_available_functions);
3316 if (ret) {
3317 if (ret == -2) {
3318 char *str = strfilter__string(_filter);
3319 pr_err("Failed to find symbols matched to \"%s\"\n",
3320 str);
3321 free(str);
3322 } else
3323 pr_err("Failed to load symbols in %s\n",
3324 (target) ? : "kernel");
3325 goto end;
3326 }
3327 if (!dso__sorted_by_name(map->dso, map->type))
3328 dso__sort_by_name(map->dso, map->type);
3329
3330 /* Show all (filtered) symbols */
3331 setup_pager();
3332 dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
3333 end:
3334 if (user) {
3335 map__put(map);
3336 }
3337 exit_probe_symbol_maps();
3338
3339 return ret;
3340 }
3341
3342 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3343 struct perf_probe_arg *pvar)
3344 {
3345 tvar->value = strdup(pvar->var);
3346 if (tvar->value == NULL)
3347 return -ENOMEM;
3348 if (pvar->type) {
3349 tvar->type = strdup(pvar->type);
3350 if (tvar->type == NULL)
3351 return -ENOMEM;
3352 }
3353 if (pvar->name) {
3354 tvar->name = strdup(pvar->name);
3355 if (tvar->name == NULL)
3356 return -ENOMEM;
3357 } else
3358 tvar->name = NULL;
3359 return 0;
3360 }
Linux kernel - Deliverables
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