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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / tools / perf / util / probe-event.c
blobeea132f512b0012e14f348ef0e82bdc780f3f118
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * probe-event.c : perf-probe definition to probe_events format converter
4 *
5 * Written by Masami Hiramatsu <mhiramat@redhat.com>
6 */
7
8 #include <inttypes.h>
9 #include <sys/utsname.h>
10 #include <sys/types.h>
11 #include <sys/stat.h>
12 #include <fcntl.h>
13 #include <errno.h>
14 #include <stdio.h>
15 #include <unistd.h>
16 #include <stdlib.h>
17 #include <string.h>
18 #include <stdarg.h>
19 #include <limits.h>
20 #include <elf.h>
21
22 #include "build-id.h"
23 #include "event.h"
24 #include "namespaces.h"
25 #include "strlist.h"
26 #include "strfilter.h"
27 #include "debug.h"
28 #include "dso.h"
29 #include "color.h"
30 #include "map.h"
31 #include "maps.h"
32 #include "symbol.h"
33 #include <api/fs/fs.h>
34 #include "trace-event.h" /* For __maybe_unused */
35 #include "probe-event.h"
36 #include "probe-finder.h"
37 #include "probe-file.h"
38 #include "session.h"
39 #include "string2.h"
40 #include "strbuf.h"
41
42 #include <subcmd/pager.h>
43 #include <linux/ctype.h>
44 #include <linux/zalloc.h>
45
46 #define PERFPROBE_GROUP "probe"
47
48 bool probe_event_dry_run; /* Dry run flag */
49 struct probe_conf probe_conf = { .magic_num = DEFAULT_PROBE_MAGIC_NUM };
50
51 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
52
53 int e_snprintf(char *str, size_t size, const char *format, ...)
54 {
55 int ret;
56 va_list ap;
57 va_start(ap, format);
58 ret = vsnprintf(str, size, format, ap);
59 va_end(ap);
60 if (ret >= (int)size)
61 ret = -E2BIG;
62 return ret;
63 }
64
65 static struct machine *host_machine;
66
67 /* Initialize symbol maps and path of vmlinux/modules */
68 int init_probe_symbol_maps(bool user_only)
69 {
70 int ret;
71
72 symbol_conf.sort_by_name = true;
73 symbol_conf.allow_aliases = true;
74 ret = symbol__init(NULL);
75 if (ret < 0) {
76 pr_debug("Failed to init symbol map.\n");
77 goto out;
78 }
79
80 if (host_machine || user_only) /* already initialized */
81 return 0;
82
83 if (symbol_conf.vmlinux_name)
84 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
85
86 host_machine = machine__new_host();
87 if (!host_machine) {
88 pr_debug("machine__new_host() failed.\n");
89 symbol__exit();
90 ret = -1;
91 }
92 out:
93 if (ret < 0)
94 pr_warning("Failed to init vmlinux path.\n");
95 return ret;
96 }
97
98 void exit_probe_symbol_maps(void)
99 {
100 machine__delete(host_machine);
101 host_machine = NULL;
102 symbol__exit();
103 }
104
105 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
106 {
107 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
108 struct kmap *kmap;
109 struct map *map = machine__kernel_map(host_machine);
110
111 if (map__load(map) < 0)
112 return NULL;
113
114 kmap = map__kmap(map);
115 if (!kmap)
116 return NULL;
117 return kmap->ref_reloc_sym;
118 }
119
120 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
121 bool reloc, bool reladdr)
122 {
123 struct ref_reloc_sym *reloc_sym;
124 struct symbol *sym;
125 struct map *map;
126
127 /* ref_reloc_sym is just a label. Need a special fix*/
128 reloc_sym = kernel_get_ref_reloc_sym();
129 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
130 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
131 else {
132 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
133 if (!sym)
134 return -ENOENT;
135 *addr = map->unmap_ip(map, sym->start) -
136 ((reloc) ? 0 : map->reloc) -
137 ((reladdr) ? map->start : 0);
138 }
139 return 0;
140 }
141
142 static struct map *kernel_get_module_map(const char *module)
143 {
144 struct maps *maps = machine__kernel_maps(host_machine);
145 struct map *pos;
146
147 /* A file path -- this is an offline module */
148 if (module && strchr(module, '/'))
149 return dso__new_map(module);
150
151 if (!module) {
152 pos = machine__kernel_map(host_machine);
153 return map__get(pos);
154 }
155
156 maps__for_each_entry(maps, pos) {
157 /* short_name is "[module]" */
158 if (strncmp(pos->dso->short_name + 1, module,
159 pos->dso->short_name_len - 2) == 0 &&
160 module[pos->dso->short_name_len - 2] == '\0') {
161 return map__get(pos);
162 }
163 }
164 return NULL;
165 }
166
167 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
168 {
169 /* Init maps of given executable or kernel */
170 if (user) {
171 struct map *map;
172
173 map = dso__new_map(target);
174 if (map && map->dso)
175 map->dso->nsinfo = nsinfo__get(nsi);
176 return map;
177 } else {
178 return kernel_get_module_map(target);
179 }
180 }
181
182 static int convert_exec_to_group(const char *exec, char **result)
183 {
184 char *ptr1, *ptr2, *exec_copy;
185 char buf[64];
186 int ret;
187
188 exec_copy = strdup(exec);
189 if (!exec_copy)
190 return -ENOMEM;
191
192 ptr1 = basename(exec_copy);
193 if (!ptr1) {
194 ret = -EINVAL;
195 goto out;
196 }
197
198 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
199 if (!isalnum(*ptr2) && *ptr2 != '_') {
200 *ptr2 = '\0';
201 break;
202 }
203 }
204
205 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
206 if (ret < 0)
207 goto out;
208
209 *result = strdup(buf);
210 ret = *result ? 0 : -ENOMEM;
211
212 out:
213 free(exec_copy);
214 return ret;
215 }
216
217 static void clear_perf_probe_point(struct perf_probe_point *pp)
218 {
219 zfree(&pp->file);
220 zfree(&pp->function);
221 zfree(&pp->lazy_line);
222 }
223
224 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
225 {
226 int i;
227
228 for (i = 0; i < ntevs; i++)
229 clear_probe_trace_event(tevs + i);
230 }
231
232 static bool kprobe_blacklist__listed(unsigned long address);
233 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
234 {
235 u64 etext_addr = 0;
236 int ret;
237
238 /* Get the address of _etext for checking non-probable text symbol */
239 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
240 false, false);
241
242 if (ret == 0 && etext_addr < address)
243 pr_warning("%s is out of .text, skip it.\n", symbol);
244 else if (kprobe_blacklist__listed(address))
245 pr_warning("%s is blacklisted function, skip it.\n", symbol);
246 else
247 return false;
248
249 return true;
250 }
251
252 /*
253 * @module can be module name of module file path. In case of path,
254 * inspect elf and find out what is actual module name.
255 * Caller has to free mod_name after using it.
256 */
257 static char *find_module_name(const char *module)
258 {
259 int fd;
260 Elf *elf;
261 GElf_Ehdr ehdr;
262 GElf_Shdr shdr;
263 Elf_Data *data;
264 Elf_Scn *sec;
265 char *mod_name = NULL;
266 int name_offset;
267
268 fd = open(module, O_RDONLY);
269 if (fd < 0)
270 return NULL;
271
272 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
273 if (elf == NULL)
274 goto elf_err;
275
276 if (gelf_getehdr(elf, &ehdr) == NULL)
277 goto ret_err;
278
279 sec = elf_section_by_name(elf, &ehdr, &shdr,
280 ".gnu.linkonce.this_module", NULL);
281 if (!sec)
282 goto ret_err;
283
284 data = elf_getdata(sec, NULL);
285 if (!data || !data->d_buf)
286 goto ret_err;
287
288 /*
289 * NOTE:
290 * '.gnu.linkonce.this_module' section of kernel module elf directly
291 * maps to 'struct module' from linux/module.h. This section contains
292 * actual module name which will be used by kernel after loading it.
293 * But, we cannot use 'struct module' here since linux/module.h is not
294 * exposed to user-space. Offset of 'name' has remained same from long
295 * time, so hardcoding it here.
296 */
297 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
298 name_offset = 12;
299 else /* expect ELFCLASS64 by default */
300 name_offset = 24;
301
302 mod_name = strdup((char *)data->d_buf + name_offset);
303
304 ret_err:
305 elf_end(elf);
306 elf_err:
307 close(fd);
308 return mod_name;
309 }
310
311 #ifdef HAVE_DWARF_SUPPORT
312
313 static int kernel_get_module_dso(const char *module, struct dso **pdso)
314 {
315 struct dso *dso;
316 struct map *map;
317 const char *vmlinux_name;
318 int ret = 0;
319
320 if (module) {
321 char module_name[128];
322
323 snprintf(module_name, sizeof(module_name), "[%s]", module);
324 map = maps__find_by_name(&host_machine->kmaps, module_name);
325 if (map) {
326 dso = map->dso;
327 goto found;
328 }
329 pr_debug("Failed to find module %s.\n", module);
330 return -ENOENT;
331 }
332
333 map = machine__kernel_map(host_machine);
334 dso = map->dso;
335
336 vmlinux_name = symbol_conf.vmlinux_name;
337 dso->load_errno = 0;
338 if (vmlinux_name)
339 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
340 else
341 ret = dso__load_vmlinux_path(dso, map);
342 found:
343 *pdso = dso;
344 return ret;
345 }
346
347 /*
348 * Some binaries like glibc have special symbols which are on the symbol
349 * table, but not in the debuginfo. If we can find the address of the
350 * symbol from map, we can translate the address back to the probe point.
351 */
352 static int find_alternative_probe_point(struct debuginfo *dinfo,
353 struct perf_probe_point *pp,
354 struct perf_probe_point *result,
355 const char *target, struct nsinfo *nsi,
356 bool uprobes)
357 {
358 struct map *map = NULL;
359 struct symbol *sym;
360 u64 address = 0;
361 int ret = -ENOENT;
362
363 /* This can work only for function-name based one */
364 if (!pp->function || pp->file)
365 return -ENOTSUP;
366
367 map = get_target_map(target, nsi, uprobes);
368 if (!map)
369 return -EINVAL;
370
371 /* Find the address of given function */
372 map__for_each_symbol_by_name(map, pp->function, sym) {
373 if (uprobes)
374 address = sym->start;
375 else
376 address = map->unmap_ip(map, sym->start) - map->reloc;
377 break;
378 }
379 if (!address) {
380 ret = -ENOENT;
381 goto out;
382 }
383 pr_debug("Symbol %s address found : %" PRIx64 "\n",
384 pp->function, address);
385
386 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
387 result);
388 if (ret <= 0)
389 ret = (!ret) ? -ENOENT : ret;
390 else {
391 result->offset += pp->offset;
392 result->line += pp->line;
393 result->retprobe = pp->retprobe;
394 ret = 0;
395 }
396
397 out:
398 map__put(map);
399 return ret;
400
401 }
402
403 static int get_alternative_probe_event(struct debuginfo *dinfo,
404 struct perf_probe_event *pev,
405 struct perf_probe_point *tmp)
406 {
407 int ret;
408
409 memcpy(tmp, &pev->point, sizeof(*tmp));
410 memset(&pev->point, 0, sizeof(pev->point));
411 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
412 pev->nsi, pev->uprobes);
413 if (ret < 0)
414 memcpy(&pev->point, tmp, sizeof(*tmp));
415
416 return ret;
417 }
418
419 static int get_alternative_line_range(struct debuginfo *dinfo,
420 struct line_range *lr,
421 const char *target, bool user)
422 {
423 struct perf_probe_point pp = { .function = lr->function,
424 .file = lr->file,
425 .line = lr->start };
426 struct perf_probe_point result;
427 int ret, len = 0;
428
429 memset(&result, 0, sizeof(result));
430
431 if (lr->end != INT_MAX)
432 len = lr->end - lr->start;
433 ret = find_alternative_probe_point(dinfo, &pp, &result,
434 target, NULL, user);
435 if (!ret) {
436 lr->function = result.function;
437 lr->file = result.file;
438 lr->start = result.line;
439 if (lr->end != INT_MAX)
440 lr->end = lr->start + len;
441 clear_perf_probe_point(&pp);
442 }
443 return ret;
444 }
445
446 /* Open new debuginfo of given module */
447 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
448 bool silent)
449 {
450 const char *path = module;
451 char reason[STRERR_BUFSIZE];
452 struct debuginfo *ret = NULL;
453 struct dso *dso = NULL;
454 struct nscookie nsc;
455 int err;
456
457 if (!module || !strchr(module, '/')) {
458 err = kernel_get_module_dso(module, &dso);
459 if (err < 0) {
460 if (!dso || dso->load_errno == 0) {
461 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
462 strcpy(reason, "(unknown)");
463 } else
464 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
465 if (!silent) {
466 if (module)
467 pr_err("Module %s is not loaded, please specify its full path name.\n", module);
468 else
469 pr_err("Failed to find the path for the kernel: %s\n", reason);
470 }
471 return NULL;
472 }
473 path = dso->long_name;
474 }
475 nsinfo__mountns_enter(nsi, &nsc);
476 ret = debuginfo__new(path);
477 if (!ret && !silent) {
478 pr_warning("The %s file has no debug information.\n", path);
479 if (!module || !strtailcmp(path, ".ko"))
480 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
481 else
482 pr_warning("Rebuild with -g, ");
483 pr_warning("or install an appropriate debuginfo package.\n");
484 }
485 nsinfo__mountns_exit(&nsc);
486 return ret;
487 }
488
489 /* For caching the last debuginfo */
490 static struct debuginfo *debuginfo_cache;
491 static char *debuginfo_cache_path;
492
493 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
494 {
495 const char *path = module;
496
497 /* If the module is NULL, it should be the kernel. */
498 if (!module)
499 path = "kernel";
500
501 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
502 goto out;
503
504 /* Copy module path */
505 free(debuginfo_cache_path);
506 debuginfo_cache_path = strdup(path);
507 if (!debuginfo_cache_path) {
508 debuginfo__delete(debuginfo_cache);
509 debuginfo_cache = NULL;
510 goto out;
511 }
512
513 debuginfo_cache = open_debuginfo(module, NULL, silent);
514 if (!debuginfo_cache)
515 zfree(&debuginfo_cache_path);
516 out:
517 return debuginfo_cache;
518 }
519
520 static void debuginfo_cache__exit(void)
521 {
522 debuginfo__delete(debuginfo_cache);
523 debuginfo_cache = NULL;
524 zfree(&debuginfo_cache_path);
525 }
526
527
528 static int get_text_start_address(const char *exec, unsigned long *address,
529 struct nsinfo *nsi)
530 {
531 Elf *elf;
532 GElf_Ehdr ehdr;
533 GElf_Shdr shdr;
534 int fd, ret = -ENOENT;
535 struct nscookie nsc;
536
537 nsinfo__mountns_enter(nsi, &nsc);
538 fd = open(exec, O_RDONLY);
539 nsinfo__mountns_exit(&nsc);
540 if (fd < 0)
541 return -errno;
542
543 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
544 if (elf == NULL) {
545 ret = -EINVAL;
546 goto out_close;
547 }
548
549 if (gelf_getehdr(elf, &ehdr) == NULL)
550 goto out;
551
552 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
553 goto out;
554
555 *address = shdr.sh_addr - shdr.sh_offset;
556 ret = 0;
557 out:
558 elf_end(elf);
559 out_close:
560 close(fd);
561
562 return ret;
563 }
564
565 /*
566 * Convert trace point to probe point with debuginfo
567 */
568 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
569 struct perf_probe_point *pp,
570 bool is_kprobe)
571 {
572 struct debuginfo *dinfo = NULL;
573 unsigned long stext = 0;
574 u64 addr = tp->address;
575 int ret = -ENOENT;
576
577 /* convert the address to dwarf address */
578 if (!is_kprobe) {
579 if (!addr) {
580 ret = -EINVAL;
581 goto error;
582 }
583 ret = get_text_start_address(tp->module, &stext, NULL);
584 if (ret < 0)
585 goto error;
586 addr += stext;
587 } else if (tp->symbol) {
588 /* If the module is given, this returns relative address */
589 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
590 false, !!tp->module);
591 if (ret != 0)
592 goto error;
593 addr += tp->offset;
594 }
595
596 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
597 tp->module ? : "kernel");
598
599 dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
600 if (dinfo)
601 ret = debuginfo__find_probe_point(dinfo,
602 (unsigned long)addr, pp);
603 else
604 ret = -ENOENT;
605
606 if (ret > 0) {
607 pp->retprobe = tp->retprobe;
608 return 0;
609 }
610 error:
611 pr_debug("Failed to find corresponding probes from debuginfo.\n");
612 return ret ? : -ENOENT;
613 }
614
615 /* Adjust symbol name and address */
616 static int post_process_probe_trace_point(struct probe_trace_point *tp,
617 struct map *map, unsigned long offs)
618 {
619 struct symbol *sym;
620 u64 addr = tp->address - offs;
621
622 sym = map__find_symbol(map, addr);
623 if (!sym)
624 return -ENOENT;
625
626 if (strcmp(sym->name, tp->symbol)) {
627 /* If we have no realname, use symbol for it */
628 if (!tp->realname)
629 tp->realname = tp->symbol;
630 else
631 free(tp->symbol);
632 tp->symbol = strdup(sym->name);
633 if (!tp->symbol)
634 return -ENOMEM;
635 }
636 tp->offset = addr - sym->start;
637 tp->address -= offs;
638
639 return 0;
640 }
641
642 /*
643 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
644 * and generate new symbols with suffixes such as .constprop.N or .isra.N
645 * etc. Since those symbols are not recorded in DWARF, we have to find
646 * correct generated symbols from offline ELF binary.
647 * For online kernel or uprobes we don't need this because those are
648 * rebased on _text, or already a section relative address.
649 */
650 static int
651 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
652 int ntevs, const char *pathname)
653 {
654 struct map *map;
655 unsigned long stext = 0;
656 int i, ret = 0;
657
658 /* Prepare a map for offline binary */
659 map = dso__new_map(pathname);
660 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
661 pr_warning("Failed to get ELF symbols for %s\n", pathname);
662 return -EINVAL;
663 }
664
665 for (i = 0; i < ntevs; i++) {
666 ret = post_process_probe_trace_point(&tevs[i].point,
667 map, stext);
668 if (ret < 0)
669 break;
670 }
671 map__put(map);
672
673 return ret;
674 }
675
676 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
677 int ntevs, const char *exec,
678 struct nsinfo *nsi)
679 {
680 int i, ret = 0;
681 unsigned long stext = 0;
682
683 if (!exec)
684 return 0;
685
686 ret = get_text_start_address(exec, &stext, nsi);
687 if (ret < 0)
688 return ret;
689
690 for (i = 0; i < ntevs && ret >= 0; i++) {
691 /* point.address is the address of point.symbol + point.offset */
692 tevs[i].point.address -= stext;
693 tevs[i].point.module = strdup(exec);
694 if (!tevs[i].point.module) {
695 ret = -ENOMEM;
696 break;
697 }
698 tevs[i].uprobes = true;
699 }
700
701 return ret;
702 }
703
704 static int
705 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
706 int ntevs, const char *module,
707 struct debuginfo *dinfo)
708 {
709 Dwarf_Addr text_offs = 0;
710 int i, ret = 0;
711 char *mod_name = NULL;
712 struct map *map;
713
714 if (!module)
715 return 0;
716
717 map = get_target_map(module, NULL, false);
718 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
719 pr_warning("Failed to get ELF symbols for %s\n", module);
720 return -EINVAL;
721 }
722
723 mod_name = find_module_name(module);
724 for (i = 0; i < ntevs; i++) {
725 ret = post_process_probe_trace_point(&tevs[i].point,
726 map, (unsigned long)text_offs);
727 if (ret < 0)
728 break;
729 tevs[i].point.module =
730 strdup(mod_name ? mod_name : module);
731 if (!tevs[i].point.module) {
732 ret = -ENOMEM;
733 break;
734 }
735 }
736
737 free(mod_name);
738 map__put(map);
739
740 return ret;
741 }
742
743 static int
744 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
745 int ntevs)
746 {
747 struct ref_reloc_sym *reloc_sym;
748 char *tmp;
749 int i, skipped = 0;
750
751 /* Skip post process if the target is an offline kernel */
752 if (symbol_conf.ignore_vmlinux_buildid)
753 return post_process_offline_probe_trace_events(tevs, ntevs,
754 symbol_conf.vmlinux_name);
755
756 reloc_sym = kernel_get_ref_reloc_sym();
757 if (!reloc_sym) {
758 pr_warning("Relocated base symbol is not found!\n");
759 return -EINVAL;
760 }
761
762 for (i = 0; i < ntevs; i++) {
763 if (!tevs[i].point.address)
764 continue;
765 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
766 continue;
767 /* If we found a wrong one, mark it by NULL symbol */
768 if (kprobe_warn_out_range(tevs[i].point.symbol,
769 tevs[i].point.address)) {
770 tmp = NULL;
771 skipped++;
772 } else {
773 tmp = strdup(reloc_sym->name);
774 if (!tmp)
775 return -ENOMEM;
776 }
777 /* If we have no realname, use symbol for it */
778 if (!tevs[i].point.realname)
779 tevs[i].point.realname = tevs[i].point.symbol;
780 else
781 free(tevs[i].point.symbol);
782 tevs[i].point.symbol = tmp;
783 tevs[i].point.offset = tevs[i].point.address -
784 reloc_sym->unrelocated_addr;
785 }
786 return skipped;
787 }
788
789 void __weak
790 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
791 int ntevs __maybe_unused)
792 {
793 }
794
795 /* Post processing the probe events */
796 static int post_process_probe_trace_events(struct perf_probe_event *pev,
797 struct probe_trace_event *tevs,
798 int ntevs, const char *module,
799 bool uprobe, struct debuginfo *dinfo)
800 {
801 int ret;
802
803 if (uprobe)
804 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
805 pev->nsi);
806 else if (module)
807 /* Currently ref_reloc_sym based probe is not for drivers */
808 ret = post_process_module_probe_trace_events(tevs, ntevs,
809 module, dinfo);
810 else
811 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
812
813 if (ret >= 0)
814 arch__post_process_probe_trace_events(pev, ntevs);
815
816 return ret;
817 }
818
819 /* Try to find perf_probe_event with debuginfo */
820 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
821 struct probe_trace_event **tevs)
822 {
823 bool need_dwarf = perf_probe_event_need_dwarf(pev);
824 struct perf_probe_point tmp;
825 struct debuginfo *dinfo;
826 int ntevs, ret = 0;
827
828 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
829 if (!dinfo) {
830 if (need_dwarf)
831 return -ENOENT;
832 pr_debug("Could not open debuginfo. Try to use symbols.\n");
833 return 0;
834 }
835
836 pr_debug("Try to find probe point from debuginfo.\n");
837 /* Searching trace events corresponding to a probe event */
838 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
839
840 if (ntevs == 0) { /* Not found, retry with an alternative */
841 ret = get_alternative_probe_event(dinfo, pev, &tmp);
842 if (!ret) {
843 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
844 /*
845 * Write back to the original probe_event for
846 * setting appropriate (user given) event name
847 */
848 clear_perf_probe_point(&pev->point);
849 memcpy(&pev->point, &tmp, sizeof(tmp));
850 }
851 }
852
853 if (ntevs > 0) { /* Succeeded to find trace events */
854 pr_debug("Found %d probe_trace_events.\n", ntevs);
855 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
856 pev->target, pev->uprobes, dinfo);
857 if (ret < 0 || ret == ntevs) {
858 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
859 clear_probe_trace_events(*tevs, ntevs);
860 zfree(tevs);
861 ntevs = 0;
862 }
863 }
864
865 debuginfo__delete(dinfo);
866
867 if (ntevs == 0) { /* No error but failed to find probe point. */
868 pr_warning("Probe point '%s' not found.\n",
869 synthesize_perf_probe_point(&pev->point));
870 return -ENOENT;
871 } else if (ntevs < 0) {
872 /* Error path : ntevs < 0 */
873 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
874 if (ntevs == -EBADF)
875 pr_warning("Warning: No dwarf info found in the vmlinux - "
876 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
877 if (!need_dwarf) {
878 pr_debug("Trying to use symbols.\n");
879 return 0;
880 }
881 }
882 return ntevs;
883 }
884
885 #define LINEBUF_SIZE 256
886 #define NR_ADDITIONAL_LINES 2
887
888 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
889 {
890 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
891 const char *color = show_num ? "" : PERF_COLOR_BLUE;
892 const char *prefix = NULL;
893
894 do {
895 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
896 goto error;
897 if (skip)
898 continue;
899 if (!prefix) {
900 prefix = show_num ? "%7d " : " ";
901 color_fprintf(stdout, color, prefix, l);
902 }
903 color_fprintf(stdout, color, "%s", buf);
904
905 } while (strchr(buf, '\n') == NULL);
906
907 return 1;
908 error:
909 if (ferror(fp)) {
910 pr_warning("File read error: %s\n",
911 str_error_r(errno, sbuf, sizeof(sbuf)));
912 return -1;
913 }
914 return 0;
915 }
916
917 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
918 {
919 int rv = __show_one_line(fp, l, skip, show_num);
920 if (rv == 0) {
921 pr_warning("Source file is shorter than expected.\n");
922 rv = -1;
923 }
924 return rv;
925 }
926
927 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
928 #define show_one_line(f,l) _show_one_line(f,l,false,false)
929 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
930 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
931
932 /*
933 * Show line-range always requires debuginfo to find source file and
934 * line number.
935 */
936 static int __show_line_range(struct line_range *lr, const char *module,
937 bool user)
938 {
939 int l = 1;
940 struct int_node *ln;
941 struct debuginfo *dinfo;
942 FILE *fp;
943 int ret;
944 char *tmp;
945 char sbuf[STRERR_BUFSIZE];
946
947 /* Search a line range */
948 dinfo = open_debuginfo(module, NULL, false);
949 if (!dinfo)
950 return -ENOENT;
951
952 ret = debuginfo__find_line_range(dinfo, lr);
953 if (!ret) { /* Not found, retry with an alternative */
954 ret = get_alternative_line_range(dinfo, lr, module, user);
955 if (!ret)
956 ret = debuginfo__find_line_range(dinfo, lr);
957 }
958 debuginfo__delete(dinfo);
959 if (ret == 0 || ret == -ENOENT) {
960 pr_warning("Specified source line is not found.\n");
961 return -ENOENT;
962 } else if (ret < 0) {
963 pr_warning("Debuginfo analysis failed.\n");
964 return ret;
965 }
966
967 /* Convert source file path */
968 tmp = lr->path;
969 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
970
971 /* Free old path when new path is assigned */
972 if (tmp != lr->path)
973 free(tmp);
974
975 if (ret < 0) {
976 pr_warning("Failed to find source file path.\n");
977 return ret;
978 }
979
980 setup_pager();
981
982 if (lr->function)
983 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
984 lr->start - lr->offset);
985 else
986 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
987
988 fp = fopen(lr->path, "r");
989 if (fp == NULL) {
990 pr_warning("Failed to open %s: %s\n", lr->path,
991 str_error_r(errno, sbuf, sizeof(sbuf)));
992 return -errno;
993 }
994 /* Skip to starting line number */
995 while (l < lr->start) {
996 ret = skip_one_line(fp, l++);
997 if (ret < 0)
998 goto end;
999 }
1000
1001 intlist__for_each_entry(ln, lr->line_list) {
1002 for (; ln->i > l; l++) {
1003 ret = show_one_line(fp, l - lr->offset);
1004 if (ret < 0)
1005 goto end;
1006 }
1007 ret = show_one_line_with_num(fp, l++ - lr->offset);
1008 if (ret < 0)
1009 goto end;
1010 }
1011
1012 if (lr->end == INT_MAX)
1013 lr->end = l + NR_ADDITIONAL_LINES;
1014 while (l <= lr->end) {
1015 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1016 if (ret <= 0)
1017 break;
1018 }
1019 end:
1020 fclose(fp);
1021 return ret;
1022 }
1023
1024 int show_line_range(struct line_range *lr, const char *module,
1025 struct nsinfo *nsi, bool user)
1026 {
1027 int ret;
1028 struct nscookie nsc;
1029
1030 ret = init_probe_symbol_maps(user);
1031 if (ret < 0)
1032 return ret;
1033 nsinfo__mountns_enter(nsi, &nsc);
1034 ret = __show_line_range(lr, module, user);
1035 nsinfo__mountns_exit(&nsc);
1036 exit_probe_symbol_maps();
1037
1038 return ret;
1039 }
1040
1041 static int show_available_vars_at(struct debuginfo *dinfo,
1042 struct perf_probe_event *pev,
1043 struct strfilter *_filter)
1044 {
1045 char *buf;
1046 int ret, i, nvars;
1047 struct str_node *node;
1048 struct variable_list *vls = NULL, *vl;
1049 struct perf_probe_point tmp;
1050 const char *var;
1051
1052 buf = synthesize_perf_probe_point(&pev->point);
1053 if (!buf)
1054 return -EINVAL;
1055 pr_debug("Searching variables at %s\n", buf);
1056
1057 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1058 if (!ret) { /* Not found, retry with an alternative */
1059 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1060 if (!ret) {
1061 ret = debuginfo__find_available_vars_at(dinfo, pev,
1062 &vls);
1063 /* Release the old probe_point */
1064 clear_perf_probe_point(&tmp);
1065 }
1066 }
1067 if (ret <= 0) {
1068 if (ret == 0 || ret == -ENOENT) {
1069 pr_err("Failed to find the address of %s\n", buf);
1070 ret = -ENOENT;
1071 } else
1072 pr_warning("Debuginfo analysis failed.\n");
1073 goto end;
1074 }
1075
1076 /* Some variables are found */
1077 fprintf(stdout, "Available variables at %s\n", buf);
1078 for (i = 0; i < ret; i++) {
1079 vl = &vls[i];
1080 /*
1081 * A probe point might be converted to
1082 * several trace points.
1083 */
1084 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1085 vl->point.offset);
1086 zfree(&vl->point.symbol);
1087 nvars = 0;
1088 if (vl->vars) {
1089 strlist__for_each_entry(node, vl->vars) {
1090 var = strchr(node->s, '\t') + 1;
1091 if (strfilter__compare(_filter, var)) {
1092 fprintf(stdout, "\t\t%s\n", node->s);
1093 nvars++;
1094 }
1095 }
1096 strlist__delete(vl->vars);
1097 }
1098 if (nvars == 0)
1099 fprintf(stdout, "\t\t(No matched variables)\n");
1100 }
1101 free(vls);
1102 end:
1103 free(buf);
1104 return ret;
1105 }
1106
1107 /* Show available variables on given probe point */
1108 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1109 struct strfilter *_filter)
1110 {
1111 int i, ret = 0;
1112 struct debuginfo *dinfo;
1113
1114 ret = init_probe_symbol_maps(pevs->uprobes);
1115 if (ret < 0)
1116 return ret;
1117
1118 dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1119 if (!dinfo) {
1120 ret = -ENOENT;
1121 goto out;
1122 }
1123
1124 setup_pager();
1125
1126 for (i = 0; i < npevs && ret >= 0; i++)
1127 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1128
1129 debuginfo__delete(dinfo);
1130 out:
1131 exit_probe_symbol_maps();
1132 return ret;
1133 }
1134
1135 #else /* !HAVE_DWARF_SUPPORT */
1136
1137 static void debuginfo_cache__exit(void)
1138 {
1139 }
1140
1141 static int
1142 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1143 struct perf_probe_point *pp __maybe_unused,
1144 bool is_kprobe __maybe_unused)
1145 {
1146 return -ENOSYS;
1147 }
1148
1149 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1150 struct probe_trace_event **tevs __maybe_unused)
1151 {
1152 if (perf_probe_event_need_dwarf(pev)) {
1153 pr_warning("Debuginfo-analysis is not supported.\n");
1154 return -ENOSYS;
1155 }
1156
1157 return 0;
1158 }
1159
1160 int show_line_range(struct line_range *lr __maybe_unused,
1161 const char *module __maybe_unused,
1162 struct nsinfo *nsi __maybe_unused,
1163 bool user __maybe_unused)
1164 {
1165 pr_warning("Debuginfo-analysis is not supported.\n");
1166 return -ENOSYS;
1167 }
1168
1169 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1170 int npevs __maybe_unused,
1171 struct strfilter *filter __maybe_unused)
1172 {
1173 pr_warning("Debuginfo-analysis is not supported.\n");
1174 return -ENOSYS;
1175 }
1176 #endif
1177
1178 void line_range__clear(struct line_range *lr)
1179 {
1180 zfree(&lr->function);
1181 zfree(&lr->file);
1182 zfree(&lr->path);
1183 zfree(&lr->comp_dir);
1184 intlist__delete(lr->line_list);
1185 }
1186
1187 int line_range__init(struct line_range *lr)
1188 {
1189 memset(lr, 0, sizeof(*lr));
1190 lr->line_list = intlist__new(NULL);
1191 if (!lr->line_list)
1192 return -ENOMEM;
1193 else
1194 return 0;
1195 }
1196
1197 static int parse_line_num(char **ptr, int *val, const char *what)
1198 {
1199 const char *start = *ptr;
1200
1201 errno = 0;
1202 *val = strtol(*ptr, ptr, 0);
1203 if (errno || *ptr == start) {
1204 semantic_error("'%s' is not a valid number.\n", what);
1205 return -EINVAL;
1206 }
1207 return 0;
1208 }
1209
1210 /* Check the name is good for event, group or function */
1211 static bool is_c_func_name(const char *name)
1212 {
1213 if (!isalpha(*name) && *name != '_')
1214 return false;
1215 while (*++name != '\0') {
1216 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1217 return false;
1218 }
1219 return true;
1220 }
1221
1222 /*
1223 * Stuff 'lr' according to the line range described by 'arg'.
1224 * The line range syntax is described by:
1225 *
1226 * SRC[:SLN[+NUM|-ELN]]
1227 * FNC[@SRC][:SLN[+NUM|-ELN]]
1228 */
1229 int parse_line_range_desc(const char *arg, struct line_range *lr)
1230 {
1231 char *range, *file, *name = strdup(arg);
1232 int err;
1233
1234 if (!name)
1235 return -ENOMEM;
1236
1237 lr->start = 0;
1238 lr->end = INT_MAX;
1239
1240 range = strchr(name, ':');
1241 if (range) {
1242 *range++ = '\0';
1243
1244 err = parse_line_num(&range, &lr->start, "start line");
1245 if (err)
1246 goto err;
1247
1248 if (*range == '+' || *range == '-') {
1249 const char c = *range++;
1250
1251 err = parse_line_num(&range, &lr->end, "end line");
1252 if (err)
1253 goto err;
1254
1255 if (c == '+') {
1256 lr->end += lr->start;
1257 /*
1258 * Adjust the number of lines here.
1259 * If the number of lines == 1, the
1260 * the end of line should be equal to
1261 * the start of line.
1262 */
1263 lr->end--;
1264 }
1265 }
1266
1267 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1268
1269 err = -EINVAL;
1270 if (lr->start > lr->end) {
1271 semantic_error("Start line must be smaller"
1272 " than end line.\n");
1273 goto err;
1274 }
1275 if (*range != '\0') {
1276 semantic_error("Tailing with invalid str '%s'.\n", range);
1277 goto err;
1278 }
1279 }
1280
1281 file = strchr(name, '@');
1282 if (file) {
1283 *file = '\0';
1284 lr->file = strdup(++file);
1285 if (lr->file == NULL) {
1286 err = -ENOMEM;
1287 goto err;
1288 }
1289 lr->function = name;
1290 } else if (strchr(name, '/') || strchr(name, '.'))
1291 lr->file = name;
1292 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1293 lr->function = name;
1294 else { /* Invalid name */
1295 semantic_error("'%s' is not a valid function name.\n", name);
1296 err = -EINVAL;
1297 goto err;
1298 }
1299
1300 return 0;
1301 err:
1302 free(name);
1303 return err;
1304 }
1305
1306 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1307 {
1308 char *ptr;
1309
1310 ptr = strpbrk_esc(*arg, ":");
1311 if (ptr) {
1312 *ptr = '\0';
1313 if (!pev->sdt && !is_c_func_name(*arg))
1314 goto ng_name;
1315 pev->group = strdup_esc(*arg);
1316 if (!pev->group)
1317 return -ENOMEM;
1318 *arg = ptr + 1;
1319 } else
1320 pev->group = NULL;
1321
1322 pev->event = strdup_esc(*arg);
1323 if (pev->event == NULL)
1324 return -ENOMEM;
1325
1326 if (!pev->sdt && !is_c_func_name(pev->event)) {
1327 zfree(&pev->event);
1328 ng_name:
1329 zfree(&pev->group);
1330 semantic_error("%s is bad for event name -it must "
1331 "follow C symbol-naming rule.\n", *arg);
1332 return -EINVAL;
1333 }
1334 return 0;
1335 }
1336
1337 /* Parse probepoint definition. */
1338 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1339 {
1340 struct perf_probe_point *pp = &pev->point;
1341 char *ptr, *tmp;
1342 char c, nc = 0;
1343 bool file_spec = false;
1344 int ret;
1345
1346 /*
1347 * <Syntax>
1348 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1349 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1350 * perf probe %[GRP:]SDT_EVENT
1351 */
1352 if (!arg)
1353 return -EINVAL;
1354
1355 if (is_sdt_event(arg)) {
1356 pev->sdt = true;
1357 if (arg[0] == '%')
1358 arg++;
1359 }
1360
1361 ptr = strpbrk_esc(arg, ";=@+%");
1362 if (pev->sdt) {
1363 if (ptr) {
1364 if (*ptr != '@') {
1365 semantic_error("%s must be an SDT name.\n",
1366 arg);
1367 return -EINVAL;
1368 }
1369 /* This must be a target file name or build id */
1370 tmp = build_id_cache__complement(ptr + 1);
1371 if (tmp) {
1372 pev->target = build_id_cache__origname(tmp);
1373 free(tmp);
1374 } else
1375 pev->target = strdup_esc(ptr + 1);
1376 if (!pev->target)
1377 return -ENOMEM;
1378 *ptr = '\0';
1379 }
1380 ret = parse_perf_probe_event_name(&arg, pev);
1381 if (ret == 0) {
1382 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1383 ret = -errno;
1384 }
1385 return ret;
1386 }
1387
1388 if (ptr && *ptr == '=') { /* Event name */
1389 *ptr = '\0';
1390 tmp = ptr + 1;
1391 ret = parse_perf_probe_event_name(&arg, pev);
1392 if (ret < 0)
1393 return ret;
1394
1395 arg = tmp;
1396 }
1397
1398 /*
1399 * Check arg is function or file name and copy it.
1400 *
1401 * We consider arg to be a file spec if and only if it satisfies
1402 * all of the below criteria::
1403 * - it does not include any of "+@%",
1404 * - it includes one of ":;", and
1405 * - it has a period '.' in the name.
1406 *
1407 * Otherwise, we consider arg to be a function specification.
1408 */
1409 if (!strpbrk_esc(arg, "+@%")) {
1410 ptr = strpbrk_esc(arg, ";:");
1411 /* This is a file spec if it includes a '.' before ; or : */
1412 if (ptr && memchr(arg, '.', ptr - arg))
1413 file_spec = true;
1414 }
1415
1416 ptr = strpbrk_esc(arg, ";:+@%");
1417 if (ptr) {
1418 nc = *ptr;
1419 *ptr++ = '\0';
1420 }
1421
1422 if (arg[0] == '\0')
1423 tmp = NULL;
1424 else {
1425 tmp = strdup_esc(arg);
1426 if (tmp == NULL)
1427 return -ENOMEM;
1428 }
1429
1430 if (file_spec)
1431 pp->file = tmp;
1432 else {
1433 pp->function = tmp;
1434
1435 /*
1436 * Keep pp->function even if this is absolute address,
1437 * so it can mark whether abs_address is valid.
1438 * Which make 'perf probe lib.bin 0x0' possible.
1439 *
1440 * Note that checking length of tmp is not needed
1441 * because when we access tmp[1] we know tmp[0] is '0',
1442 * so tmp[1] should always valid (but could be '\0').
1443 */
1444 if (tmp && !strncmp(tmp, "0x", 2)) {
1445 pp->abs_address = strtoul(pp->function, &tmp, 0);
1446 if (*tmp != '\0') {
1447 semantic_error("Invalid absolute address.\n");
1448 return -EINVAL;
1449 }
1450 }
1451 }
1452
1453 /* Parse other options */
1454 while (ptr) {
1455 arg = ptr;
1456 c = nc;
1457 if (c == ';') { /* Lazy pattern must be the last part */
1458 pp->lazy_line = strdup(arg); /* let leave escapes */
1459 if (pp->lazy_line == NULL)
1460 return -ENOMEM;
1461 break;
1462 }
1463 ptr = strpbrk_esc(arg, ";:+@%");
1464 if (ptr) {
1465 nc = *ptr;
1466 *ptr++ = '\0';
1467 }
1468 switch (c) {
1469 case ':': /* Line number */
1470 pp->line = strtoul(arg, &tmp, 0);
1471 if (*tmp != '\0') {
1472 semantic_error("There is non-digit char"
1473 " in line number.\n");
1474 return -EINVAL;
1475 }
1476 break;
1477 case '+': /* Byte offset from a symbol */
1478 pp->offset = strtoul(arg, &tmp, 0);
1479 if (*tmp != '\0') {
1480 semantic_error("There is non-digit character"
1481 " in offset.\n");
1482 return -EINVAL;
1483 }
1484 break;
1485 case '@': /* File name */
1486 if (pp->file) {
1487 semantic_error("SRC@SRC is not allowed.\n");
1488 return -EINVAL;
1489 }
1490 pp->file = strdup_esc(arg);
1491 if (pp->file == NULL)
1492 return -ENOMEM;
1493 break;
1494 case '%': /* Probe places */
1495 if (strcmp(arg, "return") == 0) {
1496 pp->retprobe = 1;
1497 } else { /* Others not supported yet */
1498 semantic_error("%%%s is not supported.\n", arg);
1499 return -ENOTSUP;
1500 }
1501 break;
1502 default: /* Buggy case */
1503 pr_err("This program has a bug at %s:%d.\n",
1504 __FILE__, __LINE__);
1505 return -ENOTSUP;
1506 break;
1507 }
1508 }
1509
1510 /* Exclusion check */
1511 if (pp->lazy_line && pp->line) {
1512 semantic_error("Lazy pattern can't be used with"
1513 " line number.\n");
1514 return -EINVAL;
1515 }
1516
1517 if (pp->lazy_line && pp->offset) {
1518 semantic_error("Lazy pattern can't be used with offset.\n");
1519 return -EINVAL;
1520 }
1521
1522 if (pp->line && pp->offset) {
1523 semantic_error("Offset can't be used with line number.\n");
1524 return -EINVAL;
1525 }
1526
1527 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1528 semantic_error("File always requires line number or "
1529 "lazy pattern.\n");
1530 return -EINVAL;
1531 }
1532
1533 if (pp->offset && !pp->function) {
1534 semantic_error("Offset requires an entry function.\n");
1535 return -EINVAL;
1536 }
1537
1538 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1539 semantic_error("Offset/Line/Lazy pattern can't be used with "
1540 "return probe.\n");
1541 return -EINVAL;
1542 }
1543
1544 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1545 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1546 pp->lazy_line);
1547 return 0;
1548 }
1549
1550 /* Parse perf-probe event argument */
1551 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1552 {
1553 char *tmp, *goodname;
1554 struct perf_probe_arg_field **fieldp;
1555
1556 pr_debug("parsing arg: %s into ", str);
1557
1558 tmp = strchr(str, '=');
1559 if (tmp) {
1560 arg->name = strndup(str, tmp - str);
1561 if (arg->name == NULL)
1562 return -ENOMEM;
1563 pr_debug("name:%s ", arg->name);
1564 str = tmp + 1;
1565 }
1566
1567 tmp = strchr(str, '@');
1568 if (tmp && tmp != str && strcmp(tmp + 1, "user")) { /* user attr */
1569 if (!user_access_is_supported()) {
1570 semantic_error("ftrace does not support user access\n");
1571 return -EINVAL;
1572 }
1573 *tmp = '\0';
1574 arg->user_access = true;
1575 pr_debug("user_access ");
1576 }
1577
1578 tmp = strchr(str, ':');
1579 if (tmp) { /* Type setting */
1580 *tmp = '\0';
1581 arg->type = strdup(tmp + 1);
1582 if (arg->type == NULL)
1583 return -ENOMEM;
1584 pr_debug("type:%s ", arg->type);
1585 }
1586
1587 tmp = strpbrk(str, "-.[");
1588 if (!is_c_varname(str) || !tmp) {
1589 /* A variable, register, symbol or special value */
1590 arg->var = strdup(str);
1591 if (arg->var == NULL)
1592 return -ENOMEM;
1593 pr_debug("%s\n", arg->var);
1594 return 0;
1595 }
1596
1597 /* Structure fields or array element */
1598 arg->var = strndup(str, tmp - str);
1599 if (arg->var == NULL)
1600 return -ENOMEM;
1601 goodname = arg->var;
1602 pr_debug("%s, ", arg->var);
1603 fieldp = &arg->field;
1604
1605 do {
1606 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1607 if (*fieldp == NULL)
1608 return -ENOMEM;
1609 if (*tmp == '[') { /* Array */
1610 str = tmp;
1611 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1612 (*fieldp)->ref = true;
1613 if (*tmp != ']' || tmp == str + 1) {
1614 semantic_error("Array index must be a"
1615 " number.\n");
1616 return -EINVAL;
1617 }
1618 tmp++;
1619 if (*tmp == '\0')
1620 tmp = NULL;
1621 } else { /* Structure */
1622 if (*tmp == '.') {
1623 str = tmp + 1;
1624 (*fieldp)->ref = false;
1625 } else if (tmp[1] == '>') {
1626 str = tmp + 2;
1627 (*fieldp)->ref = true;
1628 } else {
1629 semantic_error("Argument parse error: %s\n",
1630 str);
1631 return -EINVAL;
1632 }
1633 tmp = strpbrk(str, "-.[");
1634 }
1635 if (tmp) {
1636 (*fieldp)->name = strndup(str, tmp - str);
1637 if ((*fieldp)->name == NULL)
1638 return -ENOMEM;
1639 if (*str != '[')
1640 goodname = (*fieldp)->name;
1641 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1642 fieldp = &(*fieldp)->next;
1643 }
1644 } while (tmp);
1645 (*fieldp)->name = strdup(str);
1646 if ((*fieldp)->name == NULL)
1647 return -ENOMEM;
1648 if (*str != '[')
1649 goodname = (*fieldp)->name;
1650 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1651
1652 /* If no name is specified, set the last field name (not array index)*/
1653 if (!arg->name) {
1654 arg->name = strdup(goodname);
1655 if (arg->name == NULL)
1656 return -ENOMEM;
1657 }
1658 return 0;
1659 }
1660
1661 /* Parse perf-probe event command */
1662 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1663 {
1664 char **argv;
1665 int argc, i, ret = 0;
1666
1667 argv = argv_split(cmd, &argc);
1668 if (!argv) {
1669 pr_debug("Failed to split arguments.\n");
1670 return -ENOMEM;
1671 }
1672 if (argc - 1 > MAX_PROBE_ARGS) {
1673 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1674 ret = -ERANGE;
1675 goto out;
1676 }
1677 /* Parse probe point */
1678 ret = parse_perf_probe_point(argv[0], pev);
1679 if (ret < 0)
1680 goto out;
1681
1682 /* Generate event name if needed */
1683 if (!pev->event && pev->point.function && pev->point.line
1684 && !pev->point.lazy_line && !pev->point.offset) {
1685 if (asprintf(&pev->event, "%s_L%d", pev->point.function,
1686 pev->point.line) < 0)
1687 return -ENOMEM;
1688 }
1689
1690 /* Copy arguments and ensure return probe has no C argument */
1691 pev->nargs = argc - 1;
1692 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1693 if (pev->args == NULL) {
1694 ret = -ENOMEM;
1695 goto out;
1696 }
1697 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1698 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1699 if (ret >= 0 &&
1700 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1701 semantic_error("You can't specify local variable for"
1702 " kretprobe.\n");
1703 ret = -EINVAL;
1704 }
1705 }
1706 out:
1707 argv_free(argv);
1708
1709 return ret;
1710 }
1711
1712 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1713 bool perf_probe_with_var(struct perf_probe_event *pev)
1714 {
1715 int i = 0;
1716
1717 for (i = 0; i < pev->nargs; i++)
1718 if (is_c_varname(pev->args[i].var) ||
1719 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1720 !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1721 return true;
1722 return false;
1723 }
1724
1725 /* Return true if this perf_probe_event requires debuginfo */
1726 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1727 {
1728 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1729 return true;
1730
1731 if (perf_probe_with_var(pev))
1732 return true;
1733
1734 return false;
1735 }
1736
1737 /* Parse probe_events event into struct probe_point */
1738 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1739 {
1740 struct probe_trace_point *tp = &tev->point;
1741 char pr;
1742 char *p;
1743 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1744 int ret, i, argc;
1745 char **argv;
1746
1747 pr_debug("Parsing probe_events: %s\n", cmd);
1748 argv = argv_split(cmd, &argc);
1749 if (!argv) {
1750 pr_debug("Failed to split arguments.\n");
1751 return -ENOMEM;
1752 }
1753 if (argc < 2) {
1754 semantic_error("Too few probe arguments.\n");
1755 ret = -ERANGE;
1756 goto out;
1757 }
1758
1759 /* Scan event and group name. */
1760 argv0_str = strdup(argv[0]);
1761 if (argv0_str == NULL) {
1762 ret = -ENOMEM;
1763 goto out;
1764 }
1765 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1766 fmt2_str = strtok_r(NULL, "/", &fmt);
1767 fmt3_str = strtok_r(NULL, " \t", &fmt);
1768 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1769 || fmt3_str == NULL) {
1770 semantic_error("Failed to parse event name: %s\n", argv[0]);
1771 ret = -EINVAL;
1772 goto out;
1773 }
1774 pr = fmt1_str[0];
1775 tev->group = strdup(fmt2_str);
1776 tev->event = strdup(fmt3_str);
1777 if (tev->group == NULL || tev->event == NULL) {
1778 ret = -ENOMEM;
1779 goto out;
1780 }
1781 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1782
1783 tp->retprobe = (pr == 'r');
1784
1785 /* Scan module name(if there), function name and offset */
1786 p = strchr(argv[1], ':');
1787 if (p) {
1788 tp->module = strndup(argv[1], p - argv[1]);
1789 if (!tp->module) {
1790 ret = -ENOMEM;
1791 goto out;
1792 }
1793 tev->uprobes = (tp->module[0] == '/');
1794 p++;
1795 } else
1796 p = argv[1];
1797 fmt1_str = strtok_r(p, "+", &fmt);
1798 /* only the address started with 0x */
1799 if (fmt1_str[0] == '0') {
1800 /*
1801 * Fix a special case:
1802 * if address == 0, kernel reports something like:
1803 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1804 * Newer kernel may fix that, but we want to
1805 * support old kernel also.
1806 */
1807 if (strcmp(fmt1_str, "0x") == 0) {
1808 if (!argv[2] || strcmp(argv[2], "(null)")) {
1809 ret = -EINVAL;
1810 goto out;
1811 }
1812 tp->address = 0;
1813
1814 free(argv[2]);
1815 for (i = 2; argv[i + 1] != NULL; i++)
1816 argv[i] = argv[i + 1];
1817
1818 argv[i] = NULL;
1819 argc -= 1;
1820 } else
1821 tp->address = strtoul(fmt1_str, NULL, 0);
1822 } else {
1823 /* Only the symbol-based probe has offset */
1824 tp->symbol = strdup(fmt1_str);
1825 if (tp->symbol == NULL) {
1826 ret = -ENOMEM;
1827 goto out;
1828 }
1829 fmt2_str = strtok_r(NULL, "", &fmt);
1830 if (fmt2_str == NULL)
1831 tp->offset = 0;
1832 else
1833 tp->offset = strtoul(fmt2_str, NULL, 10);
1834 }
1835
1836 if (tev->uprobes) {
1837 fmt2_str = strchr(p, '(');
1838 if (fmt2_str)
1839 tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0);
1840 }
1841
1842 tev->nargs = argc - 2;
1843 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1844 if (tev->args == NULL) {
1845 ret = -ENOMEM;
1846 goto out;
1847 }
1848 for (i = 0; i < tev->nargs; i++) {
1849 p = strchr(argv[i + 2], '=');
1850 if (p) /* We don't need which register is assigned. */
1851 *p++ = '\0';
1852 else
1853 p = argv[i + 2];
1854 tev->args[i].name = strdup(argv[i + 2]);
1855 /* TODO: parse regs and offset */
1856 tev->args[i].value = strdup(p);
1857 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1858 ret = -ENOMEM;
1859 goto out;
1860 }
1861 }
1862 ret = 0;
1863 out:
1864 free(argv0_str);
1865 argv_free(argv);
1866 return ret;
1867 }
1868
1869 /* Compose only probe arg */
1870 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1871 {
1872 struct perf_probe_arg_field *field = pa->field;
1873 struct strbuf buf;
1874 char *ret = NULL;
1875 int err;
1876
1877 if (strbuf_init(&buf, 64) < 0)
1878 return NULL;
1879
1880 if (pa->name && pa->var)
1881 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1882 else
1883 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1884 if (err)
1885 goto out;
1886
1887 while (field) {
1888 if (field->name[0] == '[')
1889 err = strbuf_addstr(&buf, field->name);
1890 else
1891 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1892 field->name);
1893 field = field->next;
1894 if (err)
1895 goto out;
1896 }
1897
1898 if (pa->type)
1899 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1900 goto out;
1901
1902 ret = strbuf_detach(&buf, NULL);
1903 out:
1904 strbuf_release(&buf);
1905 return ret;
1906 }
1907
1908 /* Compose only probe point (not argument) */
1909 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1910 {
1911 struct strbuf buf;
1912 char *tmp, *ret = NULL;
1913 int len, err = 0;
1914
1915 if (strbuf_init(&buf, 64) < 0)
1916 return NULL;
1917
1918 if (pp->function) {
1919 if (strbuf_addstr(&buf, pp->function) < 0)
1920 goto out;
1921 if (pp->offset)
1922 err = strbuf_addf(&buf, "+%lu", pp->offset);
1923 else if (pp->line)
1924 err = strbuf_addf(&buf, ":%d", pp->line);
1925 else if (pp->retprobe)
1926 err = strbuf_addstr(&buf, "%return");
1927 if (err)
1928 goto out;
1929 }
1930 if (pp->file) {
1931 tmp = pp->file;
1932 len = strlen(tmp);
1933 if (len > 30) {
1934 tmp = strchr(pp->file + len - 30, '/');
1935 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1936 }
1937 err = strbuf_addf(&buf, "@%s", tmp);
1938 if (!err && !pp->function && pp->line)
1939 err = strbuf_addf(&buf, ":%d", pp->line);
1940 }
1941 if (!err)
1942 ret = strbuf_detach(&buf, NULL);
1943 out:
1944 strbuf_release(&buf);
1945 return ret;
1946 }
1947
1948 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1949 {
1950 struct strbuf buf;
1951 char *tmp, *ret = NULL;
1952 int i;
1953
1954 if (strbuf_init(&buf, 64))
1955 return NULL;
1956 if (pev->event)
1957 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1958 pev->event) < 0)
1959 goto out;
1960
1961 tmp = synthesize_perf_probe_point(&pev->point);
1962 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1963 goto out;
1964 free(tmp);
1965
1966 for (i = 0; i < pev->nargs; i++) {
1967 tmp = synthesize_perf_probe_arg(pev->args + i);
1968 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1969 goto out;
1970 free(tmp);
1971 }
1972
1973 ret = strbuf_detach(&buf, NULL);
1974 out:
1975 strbuf_release(&buf);
1976 return ret;
1977 }
1978
1979 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1980 struct strbuf *buf, int depth)
1981 {
1982 int err;
1983 if (ref->next) {
1984 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1985 depth + 1);
1986 if (depth < 0)
1987 return depth;
1988 }
1989 err = strbuf_addf(buf, "%+ld(", ref->offset);
1990 return (err < 0) ? err : depth;
1991 }
1992
1993 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1994 struct strbuf *buf)
1995 {
1996 struct probe_trace_arg_ref *ref = arg->ref;
1997 int depth = 0, err;
1998
1999 /* Argument name or separator */
2000 if (arg->name)
2001 err = strbuf_addf(buf, " %s=", arg->name);
2002 else
2003 err = strbuf_addch(buf, ' ');
2004 if (err)
2005 return err;
2006
2007 /* Special case: @XXX */
2008 if (arg->value[0] == '@' && arg->ref)
2009 ref = ref->next;
2010
2011 /* Dereferencing arguments */
2012 if (ref) {
2013 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
2014 if (depth < 0)
2015 return depth;
2016 }
2017
2018 /* Print argument value */
2019 if (arg->value[0] == '@' && arg->ref)
2020 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2021 else
2022 err = strbuf_addstr(buf, arg->value);
2023
2024 /* Closing */
2025 while (!err && depth--)
2026 err = strbuf_addch(buf, ')');
2027
2028 /* Print argument type */
2029 if (!err && arg->type)
2030 err = strbuf_addf(buf, ":%s", arg->type);
2031
2032 return err;
2033 }
2034
2035 static int
2036 synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf)
2037 {
2038 struct probe_trace_point *tp = &tev->point;
2039 int err;
2040
2041 err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address);
2042
2043 if (err >= 0 && tp->ref_ctr_offset) {
2044 if (!uprobe_ref_ctr_is_supported())
2045 return -1;
2046 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
2047 }
2048 return err >= 0 ? 0 : -1;
2049 }
2050
2051 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2052 {
2053 struct probe_trace_point *tp = &tev->point;
2054 struct strbuf buf;
2055 char *ret = NULL;
2056 int i, err;
2057
2058 /* Uprobes must have tp->module */
2059 if (tev->uprobes && !tp->module)
2060 return NULL;
2061
2062 if (strbuf_init(&buf, 32) < 0)
2063 return NULL;
2064
2065 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2066 tev->group, tev->event) < 0)
2067 goto error;
2068 /*
2069 * If tp->address == 0, then this point must be a
2070 * absolute address uprobe.
2071 * try_to_find_absolute_address() should have made
2072 * tp->symbol to "0x0".
2073 */
2074 if (tev->uprobes && !tp->address) {
2075 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2076 goto error;
2077 }
2078
2079 /* Use the tp->address for uprobes */
2080 if (tev->uprobes) {
2081 err = synthesize_uprobe_trace_def(tev, &buf);
2082 } else if (!strncmp(tp->symbol, "0x", 2)) {
2083 /* Absolute address. See try_to_find_absolute_address() */
2084 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2085 tp->module ? ":" : "", tp->address);
2086 } else {
2087 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2088 tp->module ? ":" : "", tp->symbol, tp->offset);
2089 }
2090
2091 if (err)
2092 goto error;
2093
2094 for (i = 0; i < tev->nargs; i++)
2095 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
2096 goto error;
2097
2098 ret = strbuf_detach(&buf, NULL);
2099 error:
2100 strbuf_release(&buf);
2101 return ret;
2102 }
2103
2104 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2105 struct perf_probe_point *pp,
2106 bool is_kprobe)
2107 {
2108 struct symbol *sym = NULL;
2109 struct map *map = NULL;
2110 u64 addr = tp->address;
2111 int ret = -ENOENT;
2112
2113 if (!is_kprobe) {
2114 map = dso__new_map(tp->module);
2115 if (!map)
2116 goto out;
2117 sym = map__find_symbol(map, addr);
2118 } else {
2119 if (tp->symbol && !addr) {
2120 if (kernel_get_symbol_address_by_name(tp->symbol,
2121 &addr, true, false) < 0)
2122 goto out;
2123 }
2124 if (addr) {
2125 addr += tp->offset;
2126 sym = machine__find_kernel_symbol(host_machine, addr, &map);
2127 }
2128 }
2129
2130 if (!sym)
2131 goto out;
2132
2133 pp->retprobe = tp->retprobe;
2134 pp->offset = addr - map->unmap_ip(map, sym->start);
2135 pp->function = strdup(sym->name);
2136 ret = pp->function ? 0 : -ENOMEM;
2137
2138 out:
2139 if (map && !is_kprobe) {
2140 map__put(map);
2141 }
2142
2143 return ret;
2144 }
2145
2146 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2147 struct perf_probe_point *pp,
2148 bool is_kprobe)
2149 {
2150 char buf[128];
2151 int ret;
2152
2153 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2154 if (!ret)
2155 return 0;
2156 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2157 if (!ret)
2158 return 0;
2159
2160 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2161
2162 if (tp->symbol) {
2163 pp->function = strdup(tp->symbol);
2164 pp->offset = tp->offset;
2165 } else {
2166 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2167 if (ret < 0)
2168 return ret;
2169 pp->function = strdup(buf);
2170 pp->offset = 0;
2171 }
2172 if (pp->function == NULL)
2173 return -ENOMEM;
2174
2175 pp->retprobe = tp->retprobe;
2176
2177 return 0;
2178 }
2179
2180 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2181 struct perf_probe_event *pev, bool is_kprobe)
2182 {
2183 struct strbuf buf = STRBUF_INIT;
2184 int i, ret;
2185
2186 /* Convert event/group name */
2187 pev->event = strdup(tev->event);
2188 pev->group = strdup(tev->group);
2189 if (pev->event == NULL || pev->group == NULL)
2190 return -ENOMEM;
2191
2192 /* Convert trace_point to probe_point */
2193 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2194 if (ret < 0)
2195 return ret;
2196
2197 /* Convert trace_arg to probe_arg */
2198 pev->nargs = tev->nargs;
2199 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2200 if (pev->args == NULL)
2201 return -ENOMEM;
2202 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2203 if (tev->args[i].name)
2204 pev->args[i].name = strdup(tev->args[i].name);
2205 else {
2206 if ((ret = strbuf_init(&buf, 32)) < 0)
2207 goto error;
2208 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2209 pev->args[i].name = strbuf_detach(&buf, NULL);
2210 }
2211 if (pev->args[i].name == NULL && ret >= 0)
2212 ret = -ENOMEM;
2213 }
2214 error:
2215 if (ret < 0)
2216 clear_perf_probe_event(pev);
2217
2218 return ret;
2219 }
2220
2221 void clear_perf_probe_event(struct perf_probe_event *pev)
2222 {
2223 struct perf_probe_arg_field *field, *next;
2224 int i;
2225
2226 zfree(&pev->event);
2227 zfree(&pev->group);
2228 zfree(&pev->target);
2229 clear_perf_probe_point(&pev->point);
2230
2231 for (i = 0; i < pev->nargs; i++) {
2232 zfree(&pev->args[i].name);
2233 zfree(&pev->args[i].var);
2234 zfree(&pev->args[i].type);
2235 field = pev->args[i].field;
2236 while (field) {
2237 next = field->next;
2238 zfree(&field->name);
2239 free(field);
2240 field = next;
2241 }
2242 }
2243 pev->nargs = 0;
2244 zfree(&pev->args);
2245 }
2246
2247 #define strdup_or_goto(str, label) \
2248 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2249
2250 static int perf_probe_point__copy(struct perf_probe_point *dst,
2251 struct perf_probe_point *src)
2252 {
2253 dst->file = strdup_or_goto(src->file, out_err);
2254 dst->function = strdup_or_goto(src->function, out_err);
2255 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2256 dst->line = src->line;
2257 dst->retprobe = src->retprobe;
2258 dst->offset = src->offset;
2259 return 0;
2260
2261 out_err:
2262 clear_perf_probe_point(dst);
2263 return -ENOMEM;
2264 }
2265
2266 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2267 struct perf_probe_arg *src)
2268 {
2269 struct perf_probe_arg_field *field, **ppfield;
2270
2271 dst->name = strdup_or_goto(src->name, out_err);
2272 dst->var = strdup_or_goto(src->var, out_err);
2273 dst->type = strdup_or_goto(src->type, out_err);
2274
2275 field = src->field;
2276 ppfield = &(dst->field);
2277 while (field) {
2278 *ppfield = zalloc(sizeof(*field));
2279 if (!*ppfield)
2280 goto out_err;
2281 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2282 (*ppfield)->index = field->index;
2283 (*ppfield)->ref = field->ref;
2284 field = field->next;
2285 ppfield = &((*ppfield)->next);
2286 }
2287 return 0;
2288 out_err:
2289 return -ENOMEM;
2290 }
2291
2292 int perf_probe_event__copy(struct perf_probe_event *dst,
2293 struct perf_probe_event *src)
2294 {
2295 int i;
2296
2297 dst->event = strdup_or_goto(src->event, out_err);
2298 dst->group = strdup_or_goto(src->group, out_err);
2299 dst->target = strdup_or_goto(src->target, out_err);
2300 dst->uprobes = src->uprobes;
2301
2302 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2303 goto out_err;
2304
2305 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2306 if (!dst->args)
2307 goto out_err;
2308 dst->nargs = src->nargs;
2309
2310 for (i = 0; i < src->nargs; i++)
2311 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2312 goto out_err;
2313 return 0;
2314
2315 out_err:
2316 clear_perf_probe_event(dst);
2317 return -ENOMEM;
2318 }
2319
2320 void clear_probe_trace_event(struct probe_trace_event *tev)
2321 {
2322 struct probe_trace_arg_ref *ref, *next;
2323 int i;
2324
2325 zfree(&tev->event);
2326 zfree(&tev->group);
2327 zfree(&tev->point.symbol);
2328 zfree(&tev->point.realname);
2329 zfree(&tev->point.module);
2330 for (i = 0; i < tev->nargs; i++) {
2331 zfree(&tev->args[i].name);
2332 zfree(&tev->args[i].value);
2333 zfree(&tev->args[i].type);
2334 ref = tev->args[i].ref;
2335 while (ref) {
2336 next = ref->next;
2337 free(ref);
2338 ref = next;
2339 }
2340 }
2341 zfree(&tev->args);
2342 tev->nargs = 0;
2343 }
2344
2345 struct kprobe_blacklist_node {
2346 struct list_head list;
2347 unsigned long start;
2348 unsigned long end;
2349 char *symbol;
2350 };
2351
2352 static void kprobe_blacklist__delete(struct list_head *blacklist)
2353 {
2354 struct kprobe_blacklist_node *node;
2355
2356 while (!list_empty(blacklist)) {
2357 node = list_first_entry(blacklist,
2358 struct kprobe_blacklist_node, list);
2359 list_del_init(&node->list);
2360 zfree(&node->symbol);
2361 free(node);
2362 }
2363 }
2364
2365 static int kprobe_blacklist__load(struct list_head *blacklist)
2366 {
2367 struct kprobe_blacklist_node *node;
2368 const char *__debugfs = debugfs__mountpoint();
2369 char buf[PATH_MAX], *p;
2370 FILE *fp;
2371 int ret;
2372
2373 if (__debugfs == NULL)
2374 return -ENOTSUP;
2375
2376 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2377 if (ret < 0)
2378 return ret;
2379
2380 fp = fopen(buf, "r");
2381 if (!fp)
2382 return -errno;
2383
2384 ret = 0;
2385 while (fgets(buf, PATH_MAX, fp)) {
2386 node = zalloc(sizeof(*node));
2387 if (!node) {
2388 ret = -ENOMEM;
2389 break;
2390 }
2391 INIT_LIST_HEAD(&node->list);
2392 list_add_tail(&node->list, blacklist);
2393 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2394 ret = -EINVAL;
2395 break;
2396 }
2397 p = strchr(buf, '\t');
2398 if (p) {
2399 p++;
2400 if (p[strlen(p) - 1] == '\n')
2401 p[strlen(p) - 1] = '\0';
2402 } else
2403 p = (char *)"unknown";
2404 node->symbol = strdup(p);
2405 if (!node->symbol) {
2406 ret = -ENOMEM;
2407 break;
2408 }
2409 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2410 node->start, node->end, node->symbol);
2411 ret++;
2412 }
2413 if (ret < 0)
2414 kprobe_blacklist__delete(blacklist);
2415 fclose(fp);
2416
2417 return ret;
2418 }
2419
2420 static struct kprobe_blacklist_node *
2421 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2422 unsigned long address)
2423 {
2424 struct kprobe_blacklist_node *node;
2425
2426 list_for_each_entry(node, blacklist, list) {
2427 if (node->start <= address && address < node->end)
2428 return node;
2429 }
2430
2431 return NULL;
2432 }
2433
2434 static LIST_HEAD(kprobe_blacklist);
2435
2436 static void kprobe_blacklist__init(void)
2437 {
2438 if (!list_empty(&kprobe_blacklist))
2439 return;
2440
2441 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2442 pr_debug("No kprobe blacklist support, ignored\n");
2443 }
2444
2445 static void kprobe_blacklist__release(void)
2446 {
2447 kprobe_blacklist__delete(&kprobe_blacklist);
2448 }
2449
2450 static bool kprobe_blacklist__listed(unsigned long address)
2451 {
2452 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2453 }
2454
2455 static int perf_probe_event__sprintf(const char *group, const char *event,
2456 struct perf_probe_event *pev,
2457 const char *module,
2458 struct strbuf *result)
2459 {
2460 int i, ret;
2461 char *buf;
2462
2463 if (asprintf(&buf, "%s:%s", group, event) < 0)
2464 return -errno;
2465 ret = strbuf_addf(result, " %-20s (on ", buf);
2466 free(buf);
2467 if (ret)
2468 return ret;
2469
2470 /* Synthesize only event probe point */
2471 buf = synthesize_perf_probe_point(&pev->point);
2472 if (!buf)
2473 return -ENOMEM;
2474 ret = strbuf_addstr(result, buf);
2475 free(buf);
2476
2477 if (!ret && module)
2478 ret = strbuf_addf(result, " in %s", module);
2479
2480 if (!ret && pev->nargs > 0) {
2481 ret = strbuf_add(result, " with", 5);
2482 for (i = 0; !ret && i < pev->nargs; i++) {
2483 buf = synthesize_perf_probe_arg(&pev->args[i]);
2484 if (!buf)
2485 return -ENOMEM;
2486 ret = strbuf_addf(result, " %s", buf);
2487 free(buf);
2488 }
2489 }
2490 if (!ret)
2491 ret = strbuf_addch(result, ')');
2492
2493 return ret;
2494 }
2495
2496 /* Show an event */
2497 int show_perf_probe_event(const char *group, const char *event,
2498 struct perf_probe_event *pev,
2499 const char *module, bool use_stdout)
2500 {
2501 struct strbuf buf = STRBUF_INIT;
2502 int ret;
2503
2504 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2505 if (ret >= 0) {
2506 if (use_stdout)
2507 printf("%s\n", buf.buf);
2508 else
2509 pr_info("%s\n", buf.buf);
2510 }
2511 strbuf_release(&buf);
2512
2513 return ret;
2514 }
2515
2516 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2517 struct strfilter *filter)
2518 {
2519 char tmp[128];
2520
2521 /* At first, check the event name itself */
2522 if (strfilter__compare(filter, tev->event))
2523 return true;
2524
2525 /* Next, check the combination of name and group */
2526 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2527 return false;
2528 return strfilter__compare(filter, tmp);
2529 }
2530
2531 static int __show_perf_probe_events(int fd, bool is_kprobe,
2532 struct strfilter *filter)
2533 {
2534 int ret = 0;
2535 struct probe_trace_event tev;
2536 struct perf_probe_event pev;
2537 struct strlist *rawlist;
2538 struct str_node *ent;
2539
2540 memset(&tev, 0, sizeof(tev));
2541 memset(&pev, 0, sizeof(pev));
2542
2543 rawlist = probe_file__get_rawlist(fd);
2544 if (!rawlist)
2545 return -ENOMEM;
2546
2547 strlist__for_each_entry(ent, rawlist) {
2548 ret = parse_probe_trace_command(ent->s, &tev);
2549 if (ret >= 0) {
2550 if (!filter_probe_trace_event(&tev, filter))
2551 goto next;
2552 ret = convert_to_perf_probe_event(&tev, &pev,
2553 is_kprobe);
2554 if (ret < 0)
2555 goto next;
2556 ret = show_perf_probe_event(pev.group, pev.event,
2557 &pev, tev.point.module,
2558 true);
2559 }
2560 next:
2561 clear_perf_probe_event(&pev);
2562 clear_probe_trace_event(&tev);
2563 if (ret < 0)
2564 break;
2565 }
2566 strlist__delete(rawlist);
2567 /* Cleanup cached debuginfo if needed */
2568 debuginfo_cache__exit();
2569
2570 return ret;
2571 }
2572
2573 /* List up current perf-probe events */
2574 int show_perf_probe_events(struct strfilter *filter)
2575 {
2576 int kp_fd, up_fd, ret;
2577
2578 setup_pager();
2579
2580 if (probe_conf.cache)
2581 return probe_cache__show_all_caches(filter);
2582
2583 ret = init_probe_symbol_maps(false);
2584 if (ret < 0)
2585 return ret;
2586
2587 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2588 if (ret < 0)
2589 return ret;
2590
2591 if (kp_fd >= 0)
2592 ret = __show_perf_probe_events(kp_fd, true, filter);
2593 if (up_fd >= 0 && ret >= 0)
2594 ret = __show_perf_probe_events(up_fd, false, filter);
2595 if (kp_fd > 0)
2596 close(kp_fd);
2597 if (up_fd > 0)
2598 close(up_fd);
2599 exit_probe_symbol_maps();
2600
2601 return ret;
2602 }
2603
2604 static int get_new_event_name(char *buf, size_t len, const char *base,
2605 struct strlist *namelist, bool ret_event,
2606 bool allow_suffix)
2607 {
2608 int i, ret;
2609 char *p, *nbase;
2610
2611 if (*base == '.')
2612 base++;
2613 nbase = strdup(base);
2614 if (!nbase)
2615 return -ENOMEM;
2616
2617 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2618 p = strpbrk(nbase, ".@");
2619 if (p && p != nbase)
2620 *p = '\0';
2621
2622 /* Try no suffix number */
2623 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2624 if (ret < 0) {
2625 pr_debug("snprintf() failed: %d\n", ret);
2626 goto out;
2627 }
2628 if (!strlist__has_entry(namelist, buf))
2629 goto out;
2630
2631 if (!allow_suffix) {
2632 pr_warning("Error: event \"%s\" already exists.\n"
2633 " Hint: Remove existing event by 'perf probe -d'\n"
2634 " or force duplicates by 'perf probe -f'\n"
2635 " or set 'force=yes' in BPF source.\n",
2636 buf);
2637 ret = -EEXIST;
2638 goto out;
2639 }
2640
2641 /* Try to add suffix */
2642 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2643 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2644 if (ret < 0) {
2645 pr_debug("snprintf() failed: %d\n", ret);
2646 goto out;
2647 }
2648 if (!strlist__has_entry(namelist, buf))
2649 break;
2650 }
2651 if (i == MAX_EVENT_INDEX) {
2652 pr_warning("Too many events are on the same function.\n");
2653 ret = -ERANGE;
2654 }
2655
2656 out:
2657 free(nbase);
2658
2659 /* Final validation */
2660 if (ret >= 0 && !is_c_func_name(buf)) {
2661 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2662 buf);
2663 ret = -EINVAL;
2664 }
2665
2666 return ret;
2667 }
2668
2669 /* Warn if the current kernel's uprobe implementation is old */
2670 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2671 {
2672 int i;
2673 char *buf = synthesize_probe_trace_command(tev);
2674 struct probe_trace_point *tp = &tev->point;
2675
2676 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) {
2677 pr_warning("A semaphore is associated with %s:%s and "
2678 "seems your kernel doesn't support it.\n",
2679 tev->group, tev->event);
2680 }
2681
2682 /* Old uprobe event doesn't support memory dereference */
2683 if (!tev->uprobes || tev->nargs == 0 || !buf)
2684 goto out;
2685
2686 for (i = 0; i < tev->nargs; i++)
2687 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2688 pr_warning("Please upgrade your kernel to at least "
2689 "3.14 to have access to feature %s\n",
2690 tev->args[i].value);
2691 break;
2692 }
2693 out:
2694 free(buf);
2695 }
2696
2697 /* Set new name from original perf_probe_event and namelist */
2698 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2699 struct perf_probe_event *pev,
2700 struct strlist *namelist,
2701 bool allow_suffix)
2702 {
2703 const char *event, *group;
2704 char buf[64];
2705 int ret;
2706
2707 /* If probe_event or trace_event already have the name, reuse it */
2708 if (pev->event && !pev->sdt)
2709 event = pev->event;
2710 else if (tev->event)
2711 event = tev->event;
2712 else {
2713 /* Or generate new one from probe point */
2714 if (pev->point.function &&
2715 (strncmp(pev->point.function, "0x", 2) != 0) &&
2716 !strisglob(pev->point.function))
2717 event = pev->point.function;
2718 else
2719 event = tev->point.realname;
2720 }
2721 if (pev->group && !pev->sdt)
2722 group = pev->group;
2723 else if (tev->group)
2724 group = tev->group;
2725 else
2726 group = PERFPROBE_GROUP;
2727
2728 /* Get an unused new event name */
2729 ret = get_new_event_name(buf, 64, event, namelist,
2730 tev->point.retprobe, allow_suffix);
2731 if (ret < 0)
2732 return ret;
2733
2734 event = buf;
2735
2736 tev->event = strdup(event);
2737 tev->group = strdup(group);
2738 if (tev->event == NULL || tev->group == NULL)
2739 return -ENOMEM;
2740
2741 /*
2742 * Add new event name to namelist if multiprobe event is NOT
2743 * supported, since we have to use new event name for following
2744 * probes in that case.
2745 */
2746 if (!multiprobe_event_is_supported())
2747 strlist__add(namelist, event);
2748 return 0;
2749 }
2750
2751 static int __open_probe_file_and_namelist(bool uprobe,
2752 struct strlist **namelist)
2753 {
2754 int fd;
2755
2756 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2757 if (fd < 0)
2758 return fd;
2759
2760 /* Get current event names */
2761 *namelist = probe_file__get_namelist(fd);
2762 if (!(*namelist)) {
2763 pr_debug("Failed to get current event list.\n");
2764 close(fd);
2765 return -ENOMEM;
2766 }
2767 return fd;
2768 }
2769
2770 static int __add_probe_trace_events(struct perf_probe_event *pev,
2771 struct probe_trace_event *tevs,
2772 int ntevs, bool allow_suffix)
2773 {
2774 int i, fd[2] = {-1, -1}, up, ret;
2775 struct probe_trace_event *tev = NULL;
2776 struct probe_cache *cache = NULL;
2777 struct strlist *namelist[2] = {NULL, NULL};
2778 struct nscookie nsc;
2779
2780 up = pev->uprobes ? 1 : 0;
2781 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2782 if (fd[up] < 0)
2783 return fd[up];
2784
2785 ret = 0;
2786 for (i = 0; i < ntevs; i++) {
2787 tev = &tevs[i];
2788 up = tev->uprobes ? 1 : 0;
2789 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2790 fd[up] = __open_probe_file_and_namelist(up,
2791 &namelist[up]);
2792 if (fd[up] < 0)
2793 goto close_out;
2794 }
2795 /* Skip if the symbol is out of .text or blacklisted */
2796 if (!tev->point.symbol && !pev->uprobes)
2797 continue;
2798
2799 /* Set new name for tev (and update namelist) */
2800 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2801 allow_suffix);
2802 if (ret < 0)
2803 break;
2804
2805 nsinfo__mountns_enter(pev->nsi, &nsc);
2806 ret = probe_file__add_event(fd[up], tev);
2807 nsinfo__mountns_exit(&nsc);
2808 if (ret < 0)
2809 break;
2810
2811 /*
2812 * Probes after the first probe which comes from same
2813 * user input are always allowed to add suffix, because
2814 * there might be several addresses corresponding to
2815 * one code line.
2816 */
2817 allow_suffix = true;
2818 }
2819 if (ret == -EINVAL && pev->uprobes)
2820 warn_uprobe_event_compat(tev);
2821 if (ret == 0 && probe_conf.cache) {
2822 cache = probe_cache__new(pev->target, pev->nsi);
2823 if (!cache ||
2824 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2825 probe_cache__commit(cache) < 0)
2826 pr_warning("Failed to add event to probe cache\n");
2827 probe_cache__delete(cache);
2828 }
2829
2830 close_out:
2831 for (up = 0; up < 2; up++) {
2832 strlist__delete(namelist[up]);
2833 if (fd[up] >= 0)
2834 close(fd[up]);
2835 }
2836 return ret;
2837 }
2838
2839 static int find_probe_functions(struct map *map, char *name,
2840 struct symbol **syms)
2841 {
2842 int found = 0;
2843 struct symbol *sym;
2844 struct rb_node *tmp;
2845 const char *norm, *ver;
2846 char *buf = NULL;
2847 bool cut_version = true;
2848
2849 if (map__load(map) < 0)
2850 return 0;
2851
2852 /* If user gives a version, don't cut off the version from symbols */
2853 if (strchr(name, '@'))
2854 cut_version = false;
2855
2856 map__for_each_symbol(map, sym, tmp) {
2857 norm = arch__normalize_symbol_name(sym->name);
2858 if (!norm)
2859 continue;
2860
2861 if (cut_version) {
2862 /* We don't care about default symbol or not */
2863 ver = strchr(norm, '@');
2864 if (ver) {
2865 buf = strndup(norm, ver - norm);
2866 if (!buf)
2867 return -ENOMEM;
2868 norm = buf;
2869 }
2870 }
2871
2872 if (strglobmatch(norm, name)) {
2873 found++;
2874 if (syms && found < probe_conf.max_probes)
2875 syms[found - 1] = sym;
2876 }
2877 if (buf)
2878 zfree(&buf);
2879 }
2880
2881 return found;
2882 }
2883
2884 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2885 struct probe_trace_event *tev __maybe_unused,
2886 struct map *map __maybe_unused,
2887 struct symbol *sym __maybe_unused) { }
2888
2889 /*
2890 * Find probe function addresses from map.
2891 * Return an error or the number of found probe_trace_event
2892 */
2893 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2894 struct probe_trace_event **tevs)
2895 {
2896 struct map *map = NULL;
2897 struct ref_reloc_sym *reloc_sym = NULL;
2898 struct symbol *sym;
2899 struct symbol **syms = NULL;
2900 struct probe_trace_event *tev;
2901 struct perf_probe_point *pp = &pev->point;
2902 struct probe_trace_point *tp;
2903 int num_matched_functions;
2904 int ret, i, j, skipped = 0;
2905 char *mod_name;
2906
2907 map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2908 if (!map) {
2909 ret = -EINVAL;
2910 goto out;
2911 }
2912
2913 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2914 if (!syms) {
2915 ret = -ENOMEM;
2916 goto out;
2917 }
2918
2919 /*
2920 * Load matched symbols: Since the different local symbols may have
2921 * same name but different addresses, this lists all the symbols.
2922 */
2923 num_matched_functions = find_probe_functions(map, pp->function, syms);
2924 if (num_matched_functions <= 0) {
2925 pr_err("Failed to find symbol %s in %s\n", pp->function,
2926 pev->target ? : "kernel");
2927 ret = -ENOENT;
2928 goto out;
2929 } else if (num_matched_functions > probe_conf.max_probes) {
2930 pr_err("Too many functions matched in %s\n",
2931 pev->target ? : "kernel");
2932 ret = -E2BIG;
2933 goto out;
2934 }
2935
2936 /* Note that the symbols in the kmodule are not relocated */
2937 if (!pev->uprobes && !pev->target &&
2938 (!pp->retprobe || kretprobe_offset_is_supported())) {
2939 reloc_sym = kernel_get_ref_reloc_sym();
2940 if (!reloc_sym) {
2941 pr_warning("Relocated base symbol is not found!\n");
2942 ret = -EINVAL;
2943 goto out;
2944 }
2945 }
2946
2947 /* Setup result trace-probe-events */
2948 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2949 if (!*tevs) {
2950 ret = -ENOMEM;
2951 goto out;
2952 }
2953
2954 ret = 0;
2955
2956 for (j = 0; j < num_matched_functions; j++) {
2957 sym = syms[j];
2958
2959 tev = (*tevs) + ret;
2960 tp = &tev->point;
2961 if (ret == num_matched_functions) {
2962 pr_warning("Too many symbols are listed. Skip it.\n");
2963 break;
2964 }
2965 ret++;
2966
2967 if (pp->offset > sym->end - sym->start) {
2968 pr_warning("Offset %ld is bigger than the size of %s\n",
2969 pp->offset, sym->name);
2970 ret = -ENOENT;
2971 goto err_out;
2972 }
2973 /* Add one probe point */
2974 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2975
2976 /* Check the kprobe (not in module) is within .text */
2977 if (!pev->uprobes && !pev->target &&
2978 kprobe_warn_out_range(sym->name, tp->address)) {
2979 tp->symbol = NULL; /* Skip it */
2980 skipped++;
2981 } else if (reloc_sym) {
2982 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2983 tp->offset = tp->address - reloc_sym->addr;
2984 } else {
2985 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2986 tp->offset = pp->offset;
2987 }
2988 tp->realname = strdup_or_goto(sym->name, nomem_out);
2989
2990 tp->retprobe = pp->retprobe;
2991 if (pev->target) {
2992 if (pev->uprobes) {
2993 tev->point.module = strdup_or_goto(pev->target,
2994 nomem_out);
2995 } else {
2996 mod_name = find_module_name(pev->target);
2997 tev->point.module =
2998 strdup(mod_name ? mod_name : pev->target);
2999 free(mod_name);
3000 if (!tev->point.module)
3001 goto nomem_out;
3002 }
3003 }
3004 tev->uprobes = pev->uprobes;
3005 tev->nargs = pev->nargs;
3006 if (tev->nargs) {
3007 tev->args = zalloc(sizeof(struct probe_trace_arg) *
3008 tev->nargs);
3009 if (tev->args == NULL)
3010 goto nomem_out;
3011 }
3012 for (i = 0; i < tev->nargs; i++) {
3013 if (pev->args[i].name)
3014 tev->args[i].name =
3015 strdup_or_goto(pev->args[i].name,
3016 nomem_out);
3017
3018 tev->args[i].value = strdup_or_goto(pev->args[i].var,
3019 nomem_out);
3020 if (pev->args[i].type)
3021 tev->args[i].type =
3022 strdup_or_goto(pev->args[i].type,
3023 nomem_out);
3024 }
3025 arch__fix_tev_from_maps(pev, tev, map, sym);
3026 }
3027 if (ret == skipped) {
3028 ret = -ENOENT;
3029 goto err_out;
3030 }
3031
3032 out:
3033 map__put(map);
3034 free(syms);
3035 return ret;
3036
3037 nomem_out:
3038 ret = -ENOMEM;
3039 err_out:
3040 clear_probe_trace_events(*tevs, num_matched_functions);
3041 zfree(tevs);
3042 goto out;
3043 }
3044
3045 static int try_to_find_absolute_address(struct perf_probe_event *pev,
3046 struct probe_trace_event **tevs)
3047 {
3048 struct perf_probe_point *pp = &pev->point;
3049 struct probe_trace_event *tev;
3050 struct probe_trace_point *tp;
3051 int i, err;
3052
3053 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3054 return -EINVAL;
3055 if (perf_probe_event_need_dwarf(pev))
3056 return -EINVAL;
3057
3058 /*
3059 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3060 * absolute address.
3061 *
3062 * Only one tev can be generated by this.
3063 */
3064 *tevs = zalloc(sizeof(*tev));
3065 if (!*tevs)
3066 return -ENOMEM;
3067
3068 tev = *tevs;
3069 tp = &tev->point;
3070
3071 /*
3072 * Don't use tp->offset, use address directly, because
3073 * in synthesize_probe_trace_command() address cannot be
3074 * zero.
3075 */
3076 tp->address = pev->point.abs_address;
3077 tp->retprobe = pp->retprobe;
3078 tev->uprobes = pev->uprobes;
3079
3080 err = -ENOMEM;
3081 /*
3082 * Give it a '0x' leading symbol name.
3083 * In __add_probe_trace_events, a NULL symbol is interpreted as
3084 * invalid.
3085 */
3086 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3087 goto errout;
3088
3089 /* For kprobe, check range */
3090 if ((!tev->uprobes) &&
3091 (kprobe_warn_out_range(tev->point.symbol,
3092 tev->point.address))) {
3093 err = -EACCES;
3094 goto errout;
3095 }
3096
3097 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3098 goto errout;
3099
3100 if (pev->target) {
3101 tp->module = strdup(pev->target);
3102 if (!tp->module)
3103 goto errout;
3104 }
3105
3106 if (tev->group) {
3107 tev->group = strdup(pev->group);
3108 if (!tev->group)
3109 goto errout;
3110 }
3111
3112 if (pev->event) {
3113 tev->event = strdup(pev->event);
3114 if (!tev->event)
3115 goto errout;
3116 }
3117
3118 tev->nargs = pev->nargs;
3119 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3120 if (!tev->args)
3121 goto errout;
3122
3123 for (i = 0; i < tev->nargs; i++)
3124 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3125
3126 return 1;
3127
3128 errout:
3129 clear_probe_trace_events(*tevs, 1);
3130 *tevs = NULL;
3131 return err;
3132 }
3133
3134 /* Concatinate two arrays */
3135 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3136 {
3137 void *ret;
3138
3139 ret = malloc(sz_a + sz_b);
3140 if (ret) {
3141 memcpy(ret, a, sz_a);
3142 memcpy(ret + sz_a, b, sz_b);
3143 }
3144 return ret;
3145 }
3146
3147 static int
3148 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3149 struct probe_trace_event **tevs2, int ntevs2)
3150 {
3151 struct probe_trace_event *new_tevs;
3152 int ret = 0;
3153
3154 if (*ntevs == 0) {
3155 *tevs = *tevs2;
3156 *ntevs = ntevs2;
3157 *tevs2 = NULL;
3158 return 0;
3159 }
3160
3161 if (*ntevs + ntevs2 > probe_conf.max_probes)
3162 ret = -E2BIG;
3163 else {
3164 /* Concatinate the array of probe_trace_event */
3165 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3166 *tevs2, ntevs2 * sizeof(**tevs2));
3167 if (!new_tevs)
3168 ret = -ENOMEM;
3169 else {
3170 free(*tevs);
3171 *tevs = new_tevs;
3172 *ntevs += ntevs2;
3173 }
3174 }
3175 if (ret < 0)
3176 clear_probe_trace_events(*tevs2, ntevs2);
3177 zfree(tevs2);
3178
3179 return ret;
3180 }
3181
3182 /*
3183 * Try to find probe_trace_event from given probe caches. Return the number
3184 * of cached events found, if an error occurs return the error.
3185 */
3186 static int find_cached_events(struct perf_probe_event *pev,
3187 struct probe_trace_event **tevs,
3188 const char *target)
3189 {
3190 struct probe_cache *cache;
3191 struct probe_cache_entry *entry;
3192 struct probe_trace_event *tmp_tevs = NULL;
3193 int ntevs = 0;
3194 int ret = 0;
3195
3196 cache = probe_cache__new(target, pev->nsi);
3197 /* Return 0 ("not found") if the target has no probe cache. */
3198 if (!cache)
3199 return 0;
3200
3201 for_each_probe_cache_entry(entry, cache) {
3202 /* Skip the cache entry which has no name */
3203 if (!entry->pev.event || !entry->pev.group)
3204 continue;
3205 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3206 strglobmatch(entry->pev.event, pev->event)) {
3207 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3208 if (ret > 0)
3209 ret = concat_probe_trace_events(tevs, &ntevs,
3210 &tmp_tevs, ret);
3211 if (ret < 0)
3212 break;
3213 }
3214 }
3215 probe_cache__delete(cache);
3216 if (ret < 0) {
3217 clear_probe_trace_events(*tevs, ntevs);
3218 zfree(tevs);
3219 } else {
3220 ret = ntevs;
3221 if (ntevs > 0 && target && target[0] == '/')
3222 pev->uprobes = true;
3223 }
3224
3225 return ret;
3226 }
3227
3228 /* Try to find probe_trace_event from all probe caches */
3229 static int find_cached_events_all(struct perf_probe_event *pev,
3230 struct probe_trace_event **tevs)
3231 {
3232 struct probe_trace_event *tmp_tevs = NULL;
3233 struct strlist *bidlist;
3234 struct str_node *nd;
3235 char *pathname;
3236 int ntevs = 0;
3237 int ret;
3238
3239 /* Get the buildid list of all valid caches */
3240 bidlist = build_id_cache__list_all(true);
3241 if (!bidlist) {
3242 ret = -errno;
3243 pr_debug("Failed to get buildids: %d\n", ret);
3244 return ret;
3245 }
3246
3247 ret = 0;
3248 strlist__for_each_entry(nd, bidlist) {
3249 pathname = build_id_cache__origname(nd->s);
3250 ret = find_cached_events(pev, &tmp_tevs, pathname);
3251 /* In the case of cnt == 0, we just skip it */
3252 if (ret > 0)
3253 ret = concat_probe_trace_events(tevs, &ntevs,
3254 &tmp_tevs, ret);
3255 free(pathname);
3256 if (ret < 0)
3257 break;
3258 }
3259 strlist__delete(bidlist);
3260
3261 if (ret < 0) {
3262 clear_probe_trace_events(*tevs, ntevs);
3263 zfree(tevs);
3264 } else
3265 ret = ntevs;
3266
3267 return ret;
3268 }
3269
3270 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3271 struct probe_trace_event **tevs)
3272 {
3273 struct probe_cache *cache;
3274 struct probe_cache_entry *entry;
3275 struct probe_trace_event *tev;
3276 struct str_node *node;
3277 int ret, i;
3278
3279 if (pev->sdt) {
3280 /* For SDT/cached events, we use special search functions */
3281 if (!pev->target)
3282 return find_cached_events_all(pev, tevs);
3283 else
3284 return find_cached_events(pev, tevs, pev->target);
3285 }
3286 cache = probe_cache__new(pev->target, pev->nsi);
3287 if (!cache)
3288 return 0;
3289
3290 entry = probe_cache__find(cache, pev);
3291 if (!entry) {
3292 /* SDT must be in the cache */
3293 ret = pev->sdt ? -ENOENT : 0;
3294 goto out;
3295 }
3296
3297 ret = strlist__nr_entries(entry->tevlist);
3298 if (ret > probe_conf.max_probes) {
3299 pr_debug("Too many entries matched in the cache of %s\n",
3300 pev->target ? : "kernel");
3301 ret = -E2BIG;
3302 goto out;
3303 }
3304
3305 *tevs = zalloc(ret * sizeof(*tev));
3306 if (!*tevs) {
3307 ret = -ENOMEM;
3308 goto out;
3309 }
3310
3311 i = 0;
3312 strlist__for_each_entry(node, entry->tevlist) {
3313 tev = &(*tevs)[i++];
3314 ret = parse_probe_trace_command(node->s, tev);
3315 if (ret < 0)
3316 goto out;
3317 /* Set the uprobes attribute as same as original */
3318 tev->uprobes = pev->uprobes;
3319 }
3320 ret = i;
3321
3322 out:
3323 probe_cache__delete(cache);
3324 return ret;
3325 }
3326
3327 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3328 struct probe_trace_event **tevs)
3329 {
3330 int ret;
3331
3332 if (!pev->group && !pev->sdt) {
3333 /* Set group name if not given */
3334 if (!pev->uprobes) {
3335 pev->group = strdup(PERFPROBE_GROUP);
3336 ret = pev->group ? 0 : -ENOMEM;
3337 } else
3338 ret = convert_exec_to_group(pev->target, &pev->group);
3339 if (ret != 0) {
3340 pr_warning("Failed to make a group name.\n");
3341 return ret;
3342 }
3343 }
3344
3345 ret = try_to_find_absolute_address(pev, tevs);
3346 if (ret > 0)
3347 return ret;
3348
3349 /* At first, we need to lookup cache entry */
3350 ret = find_probe_trace_events_from_cache(pev, tevs);
3351 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3352 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3353
3354 /* Convert perf_probe_event with debuginfo */
3355 ret = try_to_find_probe_trace_events(pev, tevs);
3356 if (ret != 0)
3357 return ret; /* Found in debuginfo or got an error */
3358
3359 return find_probe_trace_events_from_map(pev, tevs);
3360 }
3361
3362 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3363 {
3364 int i, ret;
3365
3366 /* Loop 1: convert all events */
3367 for (i = 0; i < npevs; i++) {
3368 /* Init kprobe blacklist if needed */
3369 if (!pevs[i].uprobes)
3370 kprobe_blacklist__init();
3371 /* Convert with or without debuginfo */
3372 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3373 if (ret < 0)
3374 return ret;
3375 pevs[i].ntevs = ret;
3376 }
3377 /* This just release blacklist only if allocated */
3378 kprobe_blacklist__release();
3379
3380 return 0;
3381 }
3382
3383 static int show_probe_trace_event(struct probe_trace_event *tev)
3384 {
3385 char *buf = synthesize_probe_trace_command(tev);
3386
3387 if (!buf) {
3388 pr_debug("Failed to synthesize probe trace event.\n");
3389 return -EINVAL;
3390 }
3391
3392 /* Showing definition always go stdout */
3393 printf("%s\n", buf);
3394 free(buf);
3395
3396 return 0;
3397 }
3398
3399 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3400 {
3401 struct strlist *namelist = strlist__new(NULL, NULL);
3402 struct probe_trace_event *tev;
3403 struct perf_probe_event *pev;
3404 int i, j, ret = 0;
3405
3406 if (!namelist)
3407 return -ENOMEM;
3408
3409 for (j = 0; j < npevs && !ret; j++) {
3410 pev = &pevs[j];
3411 for (i = 0; i < pev->ntevs && !ret; i++) {
3412 tev = &pev->tevs[i];
3413 /* Skip if the symbol is out of .text or blacklisted */
3414 if (!tev->point.symbol && !pev->uprobes)
3415 continue;
3416
3417 /* Set new name for tev (and update namelist) */
3418 ret = probe_trace_event__set_name(tev, pev,
3419 namelist, true);
3420 if (!ret)
3421 ret = show_probe_trace_event(tev);
3422 }
3423 }
3424 strlist__delete(namelist);
3425
3426 return ret;
3427 }
3428
3429 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3430 {
3431 int i, ret = 0;
3432
3433 /* Loop 2: add all events */
3434 for (i = 0; i < npevs; i++) {
3435 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3436 pevs[i].ntevs,
3437 probe_conf.force_add);
3438 if (ret < 0)
3439 break;
3440 }
3441 return ret;
3442 }
3443
3444 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3445 {
3446 int i, j;
3447 struct perf_probe_event *pev;
3448
3449 /* Loop 3: cleanup and free trace events */
3450 for (i = 0; i < npevs; i++) {
3451 pev = &pevs[i];
3452 for (j = 0; j < pevs[i].ntevs; j++)
3453 clear_probe_trace_event(&pevs[i].tevs[j]);
3454 zfree(&pevs[i].tevs);
3455 pevs[i].ntevs = 0;
3456 nsinfo__zput(pev->nsi);
3457 clear_perf_probe_event(&pevs[i]);
3458 }
3459 }
3460
3461 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3462 {
3463 int ret;
3464
3465 ret = init_probe_symbol_maps(pevs->uprobes);
3466 if (ret < 0)
3467 return ret;
3468
3469 ret = convert_perf_probe_events(pevs, npevs);
3470 if (ret == 0)
3471 ret = apply_perf_probe_events(pevs, npevs);
3472
3473 cleanup_perf_probe_events(pevs, npevs);
3474
3475 exit_probe_symbol_maps();
3476 return ret;
3477 }
3478
3479 int del_perf_probe_events(struct strfilter *filter)
3480 {
3481 int ret, ret2, ufd = -1, kfd = -1;
3482 char *str = strfilter__string(filter);
3483
3484 if (!str)
3485 return -EINVAL;
3486
3487 /* Get current event names */
3488 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3489 if (ret < 0)
3490 goto out;
3491
3492 ret = probe_file__del_events(kfd, filter);
3493 if (ret < 0 && ret != -ENOENT)
3494 goto error;
3495
3496 ret2 = probe_file__del_events(ufd, filter);
3497 if (ret2 < 0 && ret2 != -ENOENT) {
3498 ret = ret2;
3499 goto error;
3500 }
3501 ret = 0;
3502
3503 error:
3504 if (kfd >= 0)
3505 close(kfd);
3506 if (ufd >= 0)
3507 close(ufd);
3508 out:
3509 free(str);
3510
3511 return ret;
3512 }
3513
3514 int show_available_funcs(const char *target, struct nsinfo *nsi,
3515 struct strfilter *_filter, bool user)
3516 {
3517 struct rb_node *nd;
3518 struct map *map;
3519 int ret;
3520
3521 ret = init_probe_symbol_maps(user);
3522 if (ret < 0)
3523 return ret;
3524
3525 /* Get a symbol map */
3526 map = get_target_map(target, nsi, user);
3527 if (!map) {
3528 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3529 return -EINVAL;
3530 }
3531
3532 ret = map__load(map);
3533 if (ret) {
3534 if (ret == -2) {
3535 char *str = strfilter__string(_filter);
3536 pr_err("Failed to find symbols matched to \"%s\"\n",
3537 str);
3538 free(str);
3539 } else
3540 pr_err("Failed to load symbols in %s\n",
3541 (target) ? : "kernel");
3542 goto end;
3543 }
3544 if (!dso__sorted_by_name(map->dso))
3545 dso__sort_by_name(map->dso);
3546
3547 /* Show all (filtered) symbols */
3548 setup_pager();
3549
3550 for (nd = rb_first_cached(&map->dso->symbol_names); nd;
3551 nd = rb_next(nd)) {
3552 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3553
3554 if (strfilter__compare(_filter, pos->sym.name))
3555 printf("%s\n", pos->sym.name);
3556 }
3557 end:
3558 map__put(map);
3559 exit_probe_symbol_maps();
3560
3561 return ret;
3562 }
3563
3564 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3565 struct perf_probe_arg *pvar)
3566 {
3567 tvar->value = strdup(pvar->var);
3568 if (tvar->value == NULL)
3569 return -ENOMEM;
3570 if (pvar->type) {
3571 tvar->type = strdup(pvar->type);
3572 if (tvar->type == NULL)
3573 return -ENOMEM;
3574 }
3575 if (pvar->name) {
3576 tvar->name = strdup(pvar->name);
3577 if (tvar->name == NULL)
3578 return -ENOMEM;
3579 } else
3580 tvar->name = NULL;
3581 return 0;
3582 }
Linux with added FPC-III support