?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / tools / perf / util / probe-event.c
blob6d51a4c98ad7c29e79157db974dd5c281919b254
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 <libgen.h>
15 #include <stdio.h>
16 #include <unistd.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <stdarg.h>
20 #include <limits.h>
21 #include <elf.h>
22
23 #include "build-id.h"
24 #include "event.h"
25 #include "namespaces.h"
26 #include "strlist.h"
27 #include "strfilter.h"
28 #include "debug.h"
29 #include "dso.h"
30 #include "color.h"
31 #include "map.h"
32 #include "maps.h"
33 #include "mutex.h"
34 #include "symbol.h"
35 #include <api/fs/fs.h>
36 #include "trace-event.h" /* For __maybe_unused */
37 #include "probe-event.h"
38 #include "probe-finder.h"
39 #include "probe-file.h"
40 #include "session.h"
41 #include "string2.h"
42 #include "strbuf.h"
43 #include "parse-events.h"
44
45 #include <subcmd/pager.h>
46 #include <linux/ctype.h>
47 #include <linux/zalloc.h>
48
49 #ifdef HAVE_DEBUGINFOD_SUPPORT
50 #include <elfutils/debuginfod.h>
51 #endif
52
53 #define PERFPROBE_GROUP "probe"
54
55 /* Defined in kernel/trace/trace.h */
56 #define MAX_EVENT_NAME_LEN 64
57
58 bool probe_event_dry_run; /* Dry run flag */
59 struct probe_conf probe_conf = { .magic_num = DEFAULT_PROBE_MAGIC_NUM };
60
61 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
62
63 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
64
65 int e_snprintf(char *str, size_t size, const char *format, ...)
66 {
67 int ret;
68 va_list ap;
69 va_start(ap, format);
70 ret = vsnprintf(str, size, format, ap);
71 va_end(ap);
72 if (ret >= (int)size)
73 ret = -E2BIG;
74 return ret;
75 }
76
77 static struct machine *host_machine;
78
79 /* Initialize symbol maps and path of vmlinux/modules */
80 int init_probe_symbol_maps(bool user_only)
81 {
82 int ret;
83
84 symbol_conf.allow_aliases = true;
85 ret = symbol__init(NULL);
86 if (ret < 0) {
87 pr_debug("Failed to init symbol map.\n");
88 goto out;
89 }
90
91 if (host_machine || user_only) /* already initialized */
92 return 0;
93
94 if (symbol_conf.vmlinux_name)
95 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
96
97 host_machine = machine__new_host();
98 if (!host_machine) {
99 pr_debug("machine__new_host() failed.\n");
100 symbol__exit();
101 ret = -1;
102 }
103 out:
104 if (ret < 0)
105 pr_warning("Failed to init vmlinux path.\n");
106 return ret;
107 }
108
109 void exit_probe_symbol_maps(void)
110 {
111 machine__delete(host_machine);
112 host_machine = NULL;
113 symbol__exit();
114 }
115
116 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap)
117 {
118 struct kmap *kmap;
119 struct map *map = machine__kernel_map(host_machine);
120
121 if (map__load(map) < 0)
122 return NULL;
123
124 kmap = map__kmap(map);
125 if (!kmap)
126 return NULL;
127
128 if (pmap)
129 *pmap = map;
130
131 return kmap->ref_reloc_sym;
132 }
133
134 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
135 bool reloc, bool reladdr)
136 {
137 struct ref_reloc_sym *reloc_sym;
138 struct symbol *sym;
139 struct map *map;
140
141 /* ref_reloc_sym is just a label. Need a special fix*/
142 reloc_sym = kernel_get_ref_reloc_sym(&map);
143 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
144 *addr = (!map__reloc(map) || reloc) ? reloc_sym->addr :
145 reloc_sym->unrelocated_addr;
146 else {
147 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
148 if (!sym)
149 return -ENOENT;
150 *addr = map__unmap_ip(map, sym->start) -
151 ((reloc) ? 0 : map__reloc(map)) -
152 ((reladdr) ? map__start(map) : 0);
153 }
154 return 0;
155 }
156
157 struct kernel_get_module_map_cb_args {
158 const char *module;
159 struct map *result;
160 };
161
162 static int kernel_get_module_map_cb(struct map *map, void *data)
163 {
164 struct kernel_get_module_map_cb_args *args = data;
165 struct dso *dso = map__dso(map);
166 const char *short_name = dso__short_name(dso);
167 u16 short_name_len = dso__short_name_len(dso);
168
169 if (strncmp(short_name + 1, args->module, short_name_len - 2) == 0 &&
170 args->module[short_name_len - 2] == '\0') {
171 args->result = map__get(map);
172 return 1;
173 }
174 return 0;
175 }
176
177 static struct map *kernel_get_module_map(const char *module)
178 {
179 struct kernel_get_module_map_cb_args args = {
180 .module = module,
181 .result = NULL,
182 };
183
184 /* A file path -- this is an offline module */
185 if (module && strchr(module, '/'))
186 return dso__new_map(module);
187
188 if (!module) {
189 struct map *map = machine__kernel_map(host_machine);
190
191 return map__get(map);
192 }
193
194 maps__for_each_map(machine__kernel_maps(host_machine), kernel_get_module_map_cb, &args);
195
196 return args.result;
197 }
198
199 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
200 {
201 /* Init maps of given executable or kernel */
202 if (user) {
203 struct map *map;
204 struct dso *dso;
205
206 map = dso__new_map(target);
207 dso = map ? map__dso(map) : NULL;
208 if (dso) {
209 mutex_lock(dso__lock(dso));
210 dso__set_nsinfo(dso, nsinfo__get(nsi));
211 mutex_unlock(dso__lock(dso));
212 }
213 return map;
214 } else {
215 return kernel_get_module_map(target);
216 }
217 }
218
219 static int convert_exec_to_group(const char *exec, char **result)
220 {
221 char *ptr1, *ptr2, *exec_copy;
222 char buf[64];
223 int ret;
224
225 exec_copy = strdup(exec);
226 if (!exec_copy)
227 return -ENOMEM;
228
229 ptr1 = basename(exec_copy);
230 if (!ptr1) {
231 ret = -EINVAL;
232 goto out;
233 }
234
235 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
236 if (!isalnum(*ptr2) && *ptr2 != '_') {
237 *ptr2 = '\0';
238 break;
239 }
240 }
241
242 ret = e_snprintf(buf, sizeof(buf), "%s_%s", PERFPROBE_GROUP, ptr1);
243 if (ret < 0)
244 goto out;
245
246 *result = strdup(buf);
247 ret = *result ? 0 : -ENOMEM;
248
249 out:
250 free(exec_copy);
251 return ret;
252 }
253
254 static void clear_perf_probe_point(struct perf_probe_point *pp)
255 {
256 zfree(&pp->file);
257 zfree(&pp->function);
258 zfree(&pp->lazy_line);
259 }
260
261 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
262 {
263 int i;
264
265 for (i = 0; i < ntevs; i++)
266 clear_probe_trace_event(tevs + i);
267 }
268
269 static bool kprobe_blacklist__listed(u64 address);
270 static bool kprobe_warn_out_range(const char *symbol, u64 address)
271 {
272 struct map *map;
273 bool ret = false;
274
275 map = kernel_get_module_map(NULL);
276 if (map) {
277 ret = address <= map__start(map) || map__end(map) < address;
278 if (ret)
279 pr_warning("%s is out of .text, skip it.\n", symbol);
280 map__put(map);
281 }
282 if (!ret && kprobe_blacklist__listed(address)) {
283 pr_warning("%s is blacklisted function, skip it.\n", symbol);
284 ret = true;
285 }
286
287 return ret;
288 }
289
290 /*
291 * @module can be module name of module file path. In case of path,
292 * inspect elf and find out what is actual module name.
293 * Caller has to free mod_name after using it.
294 */
295 static char *find_module_name(const char *module)
296 {
297 int fd;
298 Elf *elf;
299 GElf_Ehdr ehdr;
300 GElf_Shdr shdr;
301 Elf_Data *data;
302 Elf_Scn *sec;
303 char *mod_name = NULL;
304 int name_offset;
305
306 fd = open(module, O_RDONLY);
307 if (fd < 0)
308 return NULL;
309
310 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
311 if (elf == NULL)
312 goto elf_err;
313
314 if (gelf_getehdr(elf, &ehdr) == NULL)
315 goto ret_err;
316
317 sec = elf_section_by_name(elf, &ehdr, &shdr,
318 ".gnu.linkonce.this_module", NULL);
319 if (!sec)
320 goto ret_err;
321
322 data = elf_getdata(sec, NULL);
323 if (!data || !data->d_buf)
324 goto ret_err;
325
326 /*
327 * NOTE:
328 * '.gnu.linkonce.this_module' section of kernel module elf directly
329 * maps to 'struct module' from linux/module.h. This section contains
330 * actual module name which will be used by kernel after loading it.
331 * But, we cannot use 'struct module' here since linux/module.h is not
332 * exposed to user-space. Offset of 'name' has remained same from long
333 * time, so hardcoding it here.
334 */
335 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
336 name_offset = 12;
337 else /* expect ELFCLASS64 by default */
338 name_offset = 24;
339
340 mod_name = strdup((char *)data->d_buf + name_offset);
341
342 ret_err:
343 elf_end(elf);
344 elf_err:
345 close(fd);
346 return mod_name;
347 }
348
349 #ifdef HAVE_LIBDW_SUPPORT
350
351 static int kernel_get_module_dso(const char *module, struct dso **pdso)
352 {
353 struct dso *dso;
354 struct map *map;
355 const char *vmlinux_name;
356 int ret = 0;
357
358 if (module) {
359 char module_name[128];
360
361 snprintf(module_name, sizeof(module_name), "[%s]", module);
362 map = maps__find_by_name(machine__kernel_maps(host_machine), module_name);
363 if (map) {
364 dso = map__dso(map);
365 map__put(map);
366 goto found;
367 }
368 pr_debug("Failed to find module %s.\n", module);
369 return -ENOENT;
370 }
371
372 map = machine__kernel_map(host_machine);
373 dso = map__dso(map);
374 if (!dso__has_build_id(dso))
375 dso__read_running_kernel_build_id(dso, host_machine);
376
377 vmlinux_name = symbol_conf.vmlinux_name;
378 *dso__load_errno(dso) = 0;
379 if (vmlinux_name)
380 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
381 else
382 ret = dso__load_vmlinux_path(dso, map);
383 found:
384 *pdso = dso;
385 return ret;
386 }
387
388 /*
389 * Some binaries like glibc have special symbols which are on the symbol
390 * table, but not in the debuginfo. If we can find the address of the
391 * symbol from map, we can translate the address back to the probe point.
392 */
393 static int find_alternative_probe_point(struct debuginfo *dinfo,
394 struct perf_probe_point *pp,
395 struct perf_probe_point *result,
396 const char *target, struct nsinfo *nsi,
397 bool uprobes)
398 {
399 struct map *map = NULL;
400 struct symbol *sym;
401 u64 address = 0;
402 int ret = -ENOENT;
403 size_t idx;
404
405 /* This can work only for function-name based one */
406 if (!pp->function || pp->file)
407 return -ENOTSUP;
408
409 map = get_target_map(target, nsi, uprobes);
410 if (!map)
411 return -EINVAL;
412
413 /* Find the address of given function */
414 map__for_each_symbol_by_name(map, pp->function, sym, idx) {
415 if (uprobes) {
416 address = sym->start;
417 if (sym->type == STT_GNU_IFUNC)
418 pr_warning("Warning: The probe function (%s) is a GNU indirect function.\n"
419 "Consider identifying the final function used at run time and set the probe directly on that.\n",
420 pp->function);
421 } else
422 address = map__unmap_ip(map, sym->start) - map__reloc(map);
423 break;
424 }
425 if (!address) {
426 ret = -ENOENT;
427 goto out;
428 }
429 pr_debug("Symbol %s address found : %" PRIx64 "\n",
430 pp->function, address);
431
432 ret = debuginfo__find_probe_point(dinfo, address, result);
433 if (ret <= 0)
434 ret = (!ret) ? -ENOENT : ret;
435 else {
436 result->offset += pp->offset;
437 result->line += pp->line;
438 result->retprobe = pp->retprobe;
439 ret = 0;
440 }
441
442 out:
443 map__put(map);
444 return ret;
445
446 }
447
448 static int get_alternative_probe_event(struct debuginfo *dinfo,
449 struct perf_probe_event *pev,
450 struct perf_probe_point *tmp)
451 {
452 int ret;
453
454 memcpy(tmp, &pev->point, sizeof(*tmp));
455 memset(&pev->point, 0, sizeof(pev->point));
456 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
457 pev->nsi, pev->uprobes);
458 if (ret < 0)
459 memcpy(&pev->point, tmp, sizeof(*tmp));
460
461 return ret;
462 }
463
464 static int get_alternative_line_range(struct debuginfo *dinfo,
465 struct line_range *lr,
466 const char *target, bool user)
467 {
468 struct perf_probe_point pp = { .function = lr->function,
469 .file = lr->file,
470 .line = lr->start };
471 struct perf_probe_point result;
472 int ret, len = 0;
473
474 memset(&result, 0, sizeof(result));
475
476 if (lr->end != INT_MAX)
477 len = lr->end - lr->start;
478 ret = find_alternative_probe_point(dinfo, &pp, &result,
479 target, NULL, user);
480 if (!ret) {
481 lr->function = result.function;
482 lr->file = result.file;
483 lr->start = result.line;
484 if (lr->end != INT_MAX)
485 lr->end = lr->start + len;
486 clear_perf_probe_point(&pp);
487 }
488 return ret;
489 }
490
491 #ifdef HAVE_DEBUGINFOD_SUPPORT
492 static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *nsi,
493 bool silent)
494 {
495 debuginfod_client *c = debuginfod_begin();
496 char sbuild_id[SBUILD_ID_SIZE + 1];
497 struct debuginfo *ret = NULL;
498 struct nscookie nsc;
499 char *path;
500 int fd;
501
502 if (!c)
503 return NULL;
504
505 build_id__sprintf(dso__bid(dso), sbuild_id);
506 fd = debuginfod_find_debuginfo(c, (const unsigned char *)sbuild_id,
507 0, &path);
508 if (fd >= 0)
509 close(fd);
510 debuginfod_end(c);
511 if (fd < 0) {
512 if (!silent)
513 pr_debug("Failed to find debuginfo in debuginfod.\n");
514 return NULL;
515 }
516 if (!silent)
517 pr_debug("Load debuginfo from debuginfod (%s)\n", path);
518
519 nsinfo__mountns_enter(nsi, &nsc);
520 ret = debuginfo__new((const char *)path);
521 nsinfo__mountns_exit(&nsc);
522 return ret;
523 }
524 #else
525 static inline
526 struct debuginfo *open_from_debuginfod(struct dso *dso __maybe_unused,
527 struct nsinfo *nsi __maybe_unused,
528 bool silent __maybe_unused)
529 {
530 return NULL;
531 }
532 #endif
533
534 /* Open new debuginfo of given module */
535 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
536 bool silent)
537 {
538 const char *path = module;
539 char reason[STRERR_BUFSIZE];
540 struct debuginfo *ret = NULL;
541 struct dso *dso = NULL;
542 struct nscookie nsc;
543 int err;
544
545 if (!module || !strchr(module, '/')) {
546 err = kernel_get_module_dso(module, &dso);
547 if (err < 0) {
548 if (!dso || *dso__load_errno(dso) == 0) {
549 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
550 strcpy(reason, "(unknown)");
551 } else
552 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
553 if (dso)
554 ret = open_from_debuginfod(dso, nsi, silent);
555 if (ret)
556 return ret;
557 if (!silent) {
558 if (module)
559 pr_err("Module %s is not loaded, please specify its full path name.\n", module);
560 else
561 pr_err("Failed to find the path for the kernel: %s\n", reason);
562 }
563 return NULL;
564 }
565 path = dso__long_name(dso);
566 }
567 nsinfo__mountns_enter(nsi, &nsc);
568 ret = debuginfo__new(path);
569 if (!ret && !silent) {
570 pr_warning("The %s file has no debug information.\n", path);
571 if (!module || !strtailcmp(path, ".ko"))
572 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
573 else
574 pr_warning("Rebuild with -g, ");
575 pr_warning("or install an appropriate debuginfo package.\n");
576 }
577 nsinfo__mountns_exit(&nsc);
578 return ret;
579 }
580
581 /* For caching the last debuginfo */
582 static struct debuginfo *debuginfo_cache;
583 static char *debuginfo_cache_path;
584
585 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
586 {
587 const char *path = module;
588
589 /* If the module is NULL, it should be the kernel. */
590 if (!module)
591 path = "kernel";
592
593 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
594 goto out;
595
596 /* Copy module path */
597 free(debuginfo_cache_path);
598 debuginfo_cache_path = strdup(path);
599 if (!debuginfo_cache_path) {
600 debuginfo__delete(debuginfo_cache);
601 debuginfo_cache = NULL;
602 goto out;
603 }
604
605 debuginfo_cache = open_debuginfo(module, NULL, silent);
606 if (!debuginfo_cache)
607 zfree(&debuginfo_cache_path);
608 out:
609 return debuginfo_cache;
610 }
611
612 static void debuginfo_cache__exit(void)
613 {
614 debuginfo__delete(debuginfo_cache);
615 debuginfo_cache = NULL;
616 zfree(&debuginfo_cache_path);
617 }
618
619
620 static int get_text_start_address(const char *exec, u64 *address,
621 struct nsinfo *nsi)
622 {
623 Elf *elf;
624 GElf_Ehdr ehdr;
625 GElf_Shdr shdr;
626 int fd, ret = -ENOENT;
627 struct nscookie nsc;
628
629 nsinfo__mountns_enter(nsi, &nsc);
630 fd = open(exec, O_RDONLY);
631 nsinfo__mountns_exit(&nsc);
632 if (fd < 0)
633 return -errno;
634
635 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
636 if (elf == NULL) {
637 ret = -EINVAL;
638 goto out_close;
639 }
640
641 if (gelf_getehdr(elf, &ehdr) == NULL)
642 goto out;
643
644 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
645 goto out;
646
647 *address = shdr.sh_addr - shdr.sh_offset;
648 ret = 0;
649 out:
650 elf_end(elf);
651 out_close:
652 close(fd);
653
654 return ret;
655 }
656
657 /*
658 * Convert trace point to probe point with debuginfo
659 */
660 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
661 struct perf_probe_point *pp,
662 bool is_kprobe)
663 {
664 struct debuginfo *dinfo = NULL;
665 u64 stext = 0;
666 u64 addr = tp->address;
667 int ret = -ENOENT;
668
669 /* convert the address to dwarf address */
670 if (!is_kprobe) {
671 if (!addr) {
672 ret = -EINVAL;
673 goto error;
674 }
675 ret = get_text_start_address(tp->module, &stext, NULL);
676 if (ret < 0)
677 goto error;
678 addr += stext;
679 } else if (tp->symbol) {
680 /* If the module is given, this returns relative address */
681 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
682 false, !!tp->module);
683 if (ret != 0)
684 goto error;
685 addr += tp->offset;
686 }
687
688 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
689 tp->module ? : "kernel");
690
691 dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
692 if (dinfo)
693 ret = debuginfo__find_probe_point(dinfo, addr, pp);
694 else
695 ret = -ENOENT;
696
697 if (ret > 0) {
698 pp->retprobe = tp->retprobe;
699 return 0;
700 }
701 error:
702 pr_debug("Failed to find corresponding probes from debuginfo.\n");
703 return ret ? : -ENOENT;
704 }
705
706 /* Adjust symbol name and address */
707 static int post_process_probe_trace_point(struct probe_trace_point *tp,
708 struct map *map, u64 offs)
709 {
710 struct symbol *sym;
711 u64 addr = tp->address - offs;
712
713 sym = map__find_symbol(map, addr);
714 if (!sym) {
715 /*
716 * If the address is in the inittext section, map can not
717 * find it. Ignore it if we are probing offline kernel.
718 */
719 return (symbol_conf.ignore_vmlinux_buildid) ? 0 : -ENOENT;
720 }
721
722 if (strcmp(sym->name, tp->symbol)) {
723 /* If we have no realname, use symbol for it */
724 if (!tp->realname)
725 tp->realname = tp->symbol;
726 else
727 free(tp->symbol);
728 tp->symbol = strdup(sym->name);
729 if (!tp->symbol)
730 return -ENOMEM;
731 }
732 tp->offset = addr - sym->start;
733 tp->address -= offs;
734
735 return 0;
736 }
737
738 /*
739 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
740 * and generate new symbols with suffixes such as .constprop.N or .isra.N
741 * etc. Since those symbols are not recorded in DWARF, we have to find
742 * correct generated symbols from offline ELF binary.
743 * For online kernel or uprobes we don't need this because those are
744 * rebased on _text, or already a section relative address.
745 */
746 static int
747 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
748 int ntevs, const char *pathname)
749 {
750 struct map *map;
751 u64 stext = 0;
752 int i, ret = 0;
753
754 /* Prepare a map for offline binary */
755 map = dso__new_map(pathname);
756 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
757 pr_warning("Failed to get ELF symbols for %s\n", pathname);
758 return -EINVAL;
759 }
760
761 for (i = 0; i < ntevs; i++) {
762 ret = post_process_probe_trace_point(&tevs[i].point,
763 map, stext);
764 if (ret < 0)
765 break;
766 }
767 map__put(map);
768
769 return ret;
770 }
771
772 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
773 int ntevs, const char *exec,
774 struct nsinfo *nsi)
775 {
776 int i, ret = 0;
777 u64 stext = 0;
778
779 if (!exec)
780 return 0;
781
782 ret = get_text_start_address(exec, &stext, nsi);
783 if (ret < 0)
784 return ret;
785
786 for (i = 0; i < ntevs && ret >= 0; i++) {
787 /* point.address is the address of point.symbol + point.offset */
788 tevs[i].point.address -= stext;
789 tevs[i].point.module = strdup(exec);
790 if (!tevs[i].point.module) {
791 ret = -ENOMEM;
792 break;
793 }
794 tevs[i].uprobes = true;
795 }
796
797 return ret;
798 }
799
800 static int
801 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
802 int ntevs, const char *module,
803 struct debuginfo *dinfo)
804 {
805 Dwarf_Addr text_offs = 0;
806 int i, ret = 0;
807 char *mod_name = NULL;
808 struct map *map;
809
810 if (!module)
811 return 0;
812
813 map = get_target_map(module, NULL, false);
814 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
815 pr_warning("Failed to get ELF symbols for %s\n", module);
816 return -EINVAL;
817 }
818
819 mod_name = find_module_name(module);
820 for (i = 0; i < ntevs; i++) {
821 ret = post_process_probe_trace_point(&tevs[i].point,
822 map, text_offs);
823 if (ret < 0)
824 break;
825 tevs[i].point.module =
826 strdup(mod_name ? mod_name : module);
827 if (!tevs[i].point.module) {
828 ret = -ENOMEM;
829 break;
830 }
831 }
832
833 free(mod_name);
834 map__put(map);
835
836 return ret;
837 }
838
839 static int
840 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
841 int ntevs)
842 {
843 struct ref_reloc_sym *reloc_sym;
844 struct map *map;
845 char *tmp;
846 int i, skipped = 0;
847
848 /* Skip post process if the target is an offline kernel */
849 if (symbol_conf.ignore_vmlinux_buildid)
850 return post_process_offline_probe_trace_events(tevs, ntevs,
851 symbol_conf.vmlinux_name);
852
853 reloc_sym = kernel_get_ref_reloc_sym(&map);
854 if (!reloc_sym) {
855 pr_warning("Relocated base symbol is not found! "
856 "Check /proc/sys/kernel/kptr_restrict\n"
857 "and /proc/sys/kernel/perf_event_paranoid. "
858 "Or run as privileged perf user.\n\n");
859 return -EINVAL;
860 }
861
862 for (i = 0; i < ntevs; i++) {
863 if (!tevs[i].point.address)
864 continue;
865 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
866 continue;
867 /*
868 * If we found a wrong one, mark it by NULL symbol.
869 * Since addresses in debuginfo is same as objdump, we need
870 * to convert it to addresses on memory.
871 */
872 if (kprobe_warn_out_range(tevs[i].point.symbol,
873 map__objdump_2mem(map, tevs[i].point.address))) {
874 tmp = NULL;
875 skipped++;
876 } else {
877 tmp = strdup(reloc_sym->name);
878 if (!tmp)
879 return -ENOMEM;
880 }
881 /* If we have no realname, use symbol for it */
882 if (!tevs[i].point.realname)
883 tevs[i].point.realname = tevs[i].point.symbol;
884 else
885 free(tevs[i].point.symbol);
886 tevs[i].point.symbol = tmp;
887 tevs[i].point.offset = tevs[i].point.address -
888 (map__reloc(map) ? reloc_sym->unrelocated_addr :
889 reloc_sym->addr);
890 }
891 return skipped;
892 }
893
894 void __weak
895 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
896 int ntevs __maybe_unused)
897 {
898 }
899
900 /* Post processing the probe events */
901 static int post_process_probe_trace_events(struct perf_probe_event *pev,
902 struct probe_trace_event *tevs,
903 int ntevs, const char *module,
904 bool uprobe, struct debuginfo *dinfo)
905 {
906 int ret;
907
908 if (uprobe)
909 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
910 pev->nsi);
911 else if (module)
912 /* Currently ref_reloc_sym based probe is not for drivers */
913 ret = post_process_module_probe_trace_events(tevs, ntevs,
914 module, dinfo);
915 else
916 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
917
918 if (ret >= 0)
919 arch__post_process_probe_trace_events(pev, ntevs);
920
921 return ret;
922 }
923
924 /* Try to find perf_probe_event with debuginfo */
925 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
926 struct probe_trace_event **tevs)
927 {
928 bool need_dwarf = perf_probe_event_need_dwarf(pev);
929 struct perf_probe_point tmp;
930 struct debuginfo *dinfo;
931 int ntevs, ret = 0;
932
933 /* Workaround for gcc #98776 issue.
934 * Perf failed to add kretprobe event with debuginfo of vmlinux which is
935 * compiled by gcc with -fpatchable-function-entry option enabled. The
936 * same issue with kernel module. The retprobe doesn`t need debuginfo.
937 * This workaround solution use map to query the probe function address
938 * for retprobe event.
939 */
940 if (pev->point.retprobe)
941 return 0;
942
943 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
944 if (!dinfo) {
945 if (need_dwarf)
946 return -ENODATA;
947 pr_debug("Could not open debuginfo. Try to use symbols.\n");
948 return 0;
949 }
950
951 pr_debug("Try to find probe point from debuginfo.\n");
952 /* Searching trace events corresponding to a probe event */
953 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
954
955 if (ntevs == 0) { /* Not found, retry with an alternative */
956 ret = get_alternative_probe_event(dinfo, pev, &tmp);
957 if (!ret) {
958 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
959 /*
960 * Write back to the original probe_event for
961 * setting appropriate (user given) event name
962 */
963 clear_perf_probe_point(&pev->point);
964 memcpy(&pev->point, &tmp, sizeof(tmp));
965 }
966 }
967
968 if (ntevs > 0) { /* Succeeded to find trace events */
969 pr_debug("Found %d probe_trace_events.\n", ntevs);
970 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
971 pev->target, pev->uprobes, dinfo);
972 if (ret < 0 || ret == ntevs) {
973 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
974 clear_probe_trace_events(*tevs, ntevs);
975 zfree(tevs);
976 ntevs = 0;
977 }
978 }
979
980 debuginfo__delete(dinfo);
981
982 if (ntevs == 0) { /* No error but failed to find probe point. */
983 char *probe_point = synthesize_perf_probe_point(&pev->point);
984 pr_warning("Probe point '%s' not found.\n", probe_point);
985 free(probe_point);
986 return -ENODEV;
987 } else if (ntevs < 0) {
988 /* Error path : ntevs < 0 */
989 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
990 if (ntevs == -EBADF)
991 pr_warning("Warning: No dwarf info found in the vmlinux - "
992 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
993 if (!need_dwarf) {
994 pr_debug("Trying to use symbols.\n");
995 return 0;
996 }
997 }
998 return ntevs;
999 }
1000
1001 #define LINEBUF_SIZE 256
1002 #define NR_ADDITIONAL_LINES 2
1003
1004 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
1005 {
1006 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
1007 const char *color = show_num ? "" : PERF_COLOR_BLUE;
1008 const char *prefix = NULL;
1009
1010 do {
1011 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
1012 goto error;
1013 if (skip)
1014 continue;
1015 if (!prefix) {
1016 prefix = show_num ? "%7d " : " ";
1017 color_fprintf(stdout, color, prefix, l);
1018 }
1019 color_fprintf(stdout, color, "%s", buf);
1020
1021 } while (strchr(buf, '\n') == NULL);
1022
1023 return 1;
1024 error:
1025 if (ferror(fp)) {
1026 pr_warning("File read error: %s\n",
1027 str_error_r(errno, sbuf, sizeof(sbuf)));
1028 return -1;
1029 }
1030 return 0;
1031 }
1032
1033 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
1034 {
1035 int rv = __show_one_line(fp, l, skip, show_num);
1036 if (rv == 0) {
1037 pr_warning("Source file is shorter than expected.\n");
1038 rv = -1;
1039 }
1040 return rv;
1041 }
1042
1043 static int sprint_line_description(char *sbuf, size_t size, struct line_range *lr)
1044 {
1045 if (!lr->function)
1046 return snprintf(sbuf, size, "file: %s, line: %d", lr->file, lr->start);
1047
1048 if (lr->file)
1049 return snprintf(sbuf, size, "function: %s, file:%s, line: %d", lr->function, lr->file, lr->start);
1050
1051 return snprintf(sbuf, size, "function: %s, line:%d", lr->function, lr->start);
1052 }
1053
1054 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
1055 #define show_one_line(f,l) _show_one_line(f,l,false,false)
1056 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
1057 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
1058
1059 /*
1060 * Show line-range always requires debuginfo to find source file and
1061 * line number.
1062 */
1063 static int __show_line_range(struct line_range *lr, const char *module,
1064 bool user)
1065 {
1066 struct build_id bid;
1067 int l = 1;
1068 struct int_node *ln;
1069 struct debuginfo *dinfo;
1070 FILE *fp;
1071 int ret;
1072 char *tmp;
1073 char sbuf[STRERR_BUFSIZE];
1074 char sbuild_id[SBUILD_ID_SIZE] = "";
1075
1076 /* Search a line range */
1077 dinfo = open_debuginfo(module, NULL, false);
1078 if (!dinfo)
1079 return -ENOENT;
1080
1081 ret = debuginfo__find_line_range(dinfo, lr);
1082 if (!ret) { /* Not found, retry with an alternative */
1083 pr_debug2("Failed to find line range in debuginfo. Fallback to alternative\n");
1084 ret = get_alternative_line_range(dinfo, lr, module, user);
1085 if (!ret)
1086 ret = debuginfo__find_line_range(dinfo, lr);
1087 else /* Ignore error, we just failed to find it. */
1088 ret = -ENOENT;
1089 }
1090 if (dinfo->build_id) {
1091 build_id__init(&bid, dinfo->build_id, BUILD_ID_SIZE);
1092 build_id__sprintf(&bid, sbuild_id);
1093 }
1094 debuginfo__delete(dinfo);
1095 if (ret == 0 || ret == -ENOENT) {
1096 sprint_line_description(sbuf, sizeof(sbuf), lr);
1097 pr_warning("Specified source line(%s) is not found.\n", sbuf);
1098 return -ENOENT;
1099 } else if (ret < 0) {
1100 pr_warning("Debuginfo analysis failed.\n");
1101 return ret;
1102 }
1103
1104 /* Convert source file path */
1105 tmp = lr->path;
1106 ret = find_source_path(tmp, sbuild_id, lr->comp_dir, &lr->path);
1107
1108 /* Free old path when new path is assigned */
1109 if (tmp != lr->path)
1110 free(tmp);
1111
1112 if (ret < 0) {
1113 pr_warning("Failed to find source file path.\n");
1114 return ret;
1115 }
1116
1117 setup_pager();
1118
1119 if (lr->function)
1120 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
1121 lr->start - lr->offset);
1122 else
1123 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
1124
1125 fp = fopen(lr->path, "r");
1126 if (fp == NULL) {
1127 pr_warning("Failed to open %s: %s\n", lr->path,
1128 str_error_r(errno, sbuf, sizeof(sbuf)));
1129 return -errno;
1130 }
1131 /* Skip to starting line number */
1132 while (l < lr->start) {
1133 ret = skip_one_line(fp, l++);
1134 if (ret < 0)
1135 goto end;
1136 }
1137
1138 intlist__for_each_entry(ln, lr->line_list) {
1139 for (; ln->i > (unsigned long)l; l++) {
1140 ret = show_one_line(fp, l - lr->offset);
1141 if (ret < 0)
1142 goto end;
1143 }
1144 ret = show_one_line_with_num(fp, l++ - lr->offset);
1145 if (ret < 0)
1146 goto end;
1147 }
1148
1149 if (lr->end == INT_MAX)
1150 lr->end = l + NR_ADDITIONAL_LINES;
1151 while (l <= lr->end) {
1152 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1153 if (ret <= 0)
1154 break;
1155 }
1156 end:
1157 fclose(fp);
1158 return ret;
1159 }
1160
1161 int show_line_range(struct line_range *lr, const char *module,
1162 struct nsinfo *nsi, bool user)
1163 {
1164 int ret;
1165 struct nscookie nsc;
1166
1167 ret = init_probe_symbol_maps(user);
1168 if (ret < 0)
1169 return ret;
1170 nsinfo__mountns_enter(nsi, &nsc);
1171 ret = __show_line_range(lr, module, user);
1172 nsinfo__mountns_exit(&nsc);
1173 exit_probe_symbol_maps();
1174
1175 return ret;
1176 }
1177
1178 static int show_available_vars_at(struct debuginfo *dinfo,
1179 struct perf_probe_event *pev,
1180 struct strfilter *_filter)
1181 {
1182 char *buf;
1183 int ret, i, nvars;
1184 struct str_node *node;
1185 struct variable_list *vls = NULL, *vl;
1186 struct perf_probe_point tmp;
1187 const char *var;
1188
1189 buf = synthesize_perf_probe_point(&pev->point);
1190 if (!buf)
1191 return -EINVAL;
1192 pr_debug("Searching variables at %s\n", buf);
1193
1194 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1195 if (!ret) { /* Not found, retry with an alternative */
1196 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1197 if (!ret) {
1198 ret = debuginfo__find_available_vars_at(dinfo, pev,
1199 &vls);
1200 /* Release the old probe_point */
1201 clear_perf_probe_point(&tmp);
1202 }
1203 }
1204 if (ret <= 0) {
1205 if (ret == 0 || ret == -ENOENT) {
1206 pr_err("Failed to find the address of %s\n", buf);
1207 ret = -ENOENT;
1208 } else
1209 pr_warning("Debuginfo analysis failed.\n");
1210 goto end;
1211 }
1212
1213 /* Some variables are found */
1214 fprintf(stdout, "Available variables at %s\n", buf);
1215 for (i = 0; i < ret; i++) {
1216 vl = &vls[i];
1217 /*
1218 * A probe point might be converted to
1219 * several trace points.
1220 */
1221 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1222 vl->point.offset);
1223 zfree(&vl->point.symbol);
1224 nvars = 0;
1225 if (vl->vars) {
1226 strlist__for_each_entry(node, vl->vars) {
1227 var = strchr(node->s, '\t') + 1;
1228 if (strfilter__compare(_filter, var)) {
1229 fprintf(stdout, "\t\t%s\n", node->s);
1230 nvars++;
1231 }
1232 }
1233 strlist__delete(vl->vars);
1234 }
1235 if (nvars == 0)
1236 fprintf(stdout, "\t\t(No matched variables)\n");
1237 }
1238 free(vls);
1239 end:
1240 free(buf);
1241 return ret;
1242 }
1243
1244 /* Show available variables on given probe point */
1245 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1246 struct strfilter *_filter)
1247 {
1248 int i, ret = 0;
1249 struct debuginfo *dinfo;
1250
1251 ret = init_probe_symbol_maps(pevs->uprobes);
1252 if (ret < 0)
1253 return ret;
1254
1255 dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1256 if (!dinfo) {
1257 ret = -ENOENT;
1258 goto out;
1259 }
1260
1261 setup_pager();
1262
1263 for (i = 0; i < npevs && ret >= 0; i++)
1264 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1265
1266 debuginfo__delete(dinfo);
1267 out:
1268 exit_probe_symbol_maps();
1269 return ret;
1270 }
1271
1272 #else /* !HAVE_LIBDW_SUPPORT */
1273
1274 static void debuginfo_cache__exit(void)
1275 {
1276 }
1277
1278 static int
1279 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1280 struct perf_probe_point *pp __maybe_unused,
1281 bool is_kprobe __maybe_unused)
1282 {
1283 return -ENOSYS;
1284 }
1285
1286 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1287 struct probe_trace_event **tevs __maybe_unused)
1288 {
1289 if (perf_probe_event_need_dwarf(pev)) {
1290 pr_warning("Debuginfo-analysis is not supported.\n");
1291 return -ENOSYS;
1292 }
1293
1294 return 0;
1295 }
1296
1297 int show_line_range(struct line_range *lr __maybe_unused,
1298 const char *module __maybe_unused,
1299 struct nsinfo *nsi __maybe_unused,
1300 bool user __maybe_unused)
1301 {
1302 pr_warning("Debuginfo-analysis is not supported.\n");
1303 return -ENOSYS;
1304 }
1305
1306 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1307 int npevs __maybe_unused,
1308 struct strfilter *filter __maybe_unused)
1309 {
1310 pr_warning("Debuginfo-analysis is not supported.\n");
1311 return -ENOSYS;
1312 }
1313 #endif
1314
1315 void line_range__clear(struct line_range *lr)
1316 {
1317 zfree(&lr->function);
1318 zfree(&lr->file);
1319 zfree(&lr->path);
1320 zfree(&lr->comp_dir);
1321 intlist__delete(lr->line_list);
1322 }
1323
1324 int line_range__init(struct line_range *lr)
1325 {
1326 memset(lr, 0, sizeof(*lr));
1327 lr->line_list = intlist__new(NULL);
1328 if (!lr->line_list)
1329 return -ENOMEM;
1330 else
1331 return 0;
1332 }
1333
1334 static int parse_line_num(char **ptr, int *val, const char *what)
1335 {
1336 const char *start = *ptr;
1337
1338 errno = 0;
1339 *val = strtol(*ptr, ptr, 0);
1340 if (errno || *ptr == start) {
1341 semantic_error("'%s' is not a valid number.\n", what);
1342 return -EINVAL;
1343 }
1344 return 0;
1345 }
1346
1347 /* Check the name is good for event, group or function */
1348 static bool is_c_func_name(const char *name)
1349 {
1350 if (!isalpha(*name) && *name != '_')
1351 return false;
1352 while (*++name != '\0') {
1353 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1354 return false;
1355 }
1356 return true;
1357 }
1358
1359 /*
1360 * Stuff 'lr' according to the line range described by 'arg'.
1361 * The line range syntax is described by:
1362 *
1363 * SRC[:SLN[+NUM|-ELN]]
1364 * FNC[@SRC][:SLN[+NUM|-ELN]]
1365 *
1366 * FNC@SRC accepts `FNC@*` which forcibly specify FNC as function name.
1367 * SRC and FUNC can be quoted by double/single quotes.
1368 */
1369 int parse_line_range_desc(const char *arg, struct line_range *lr)
1370 {
1371 char *buf = strdup(arg);
1372 char *p;
1373 int err;
1374
1375 if (!buf)
1376 return -ENOMEM;
1377
1378 lr->start = 0;
1379 lr->end = INT_MAX;
1380
1381 p = strpbrk_esq(buf, ":");
1382 if (p) {
1383 if (p == buf) {
1384 semantic_error("No file/function name in '%s'.\n", p);
1385 err = -EINVAL;
1386 goto err;
1387 }
1388 *(p++) = '\0';
1389
1390 err = parse_line_num(&p, &lr->start, "start line");
1391 if (err)
1392 goto err;
1393
1394 if (*p == '+' || *p == '-') {
1395 const char c = *(p++);
1396
1397 err = parse_line_num(&p, &lr->end, "end line");
1398 if (err)
1399 goto err;
1400
1401 if (c == '+') {
1402 lr->end += lr->start;
1403 /*
1404 * Adjust the number of lines here.
1405 * If the number of lines == 1, the
1406 * end of line should be equal to
1407 * the start of line.
1408 */
1409 lr->end--;
1410 }
1411 }
1412
1413 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1414
1415 err = -EINVAL;
1416 if (lr->start > lr->end) {
1417 semantic_error("Start line must be smaller"
1418 " than end line.\n");
1419 goto err;
1420 }
1421 if (*p != '\0') {
1422 semantic_error("Tailing with invalid str '%s'.\n", p);
1423 goto err;
1424 }
1425 }
1426
1427 p = strpbrk_esq(buf, "@");
1428 if (p) {
1429 *p++ = '\0';
1430 if (strcmp(p, "*")) {
1431 lr->file = strdup_esq(p);
1432 if (lr->file == NULL) {
1433 err = -ENOMEM;
1434 goto err;
1435 }
1436 }
1437 if (*buf != '\0')
1438 lr->function = strdup_esq(buf);
1439 if (!lr->function && !lr->file) {
1440 semantic_error("Only '@*' is not allowed.\n");
1441 err = -EINVAL;
1442 goto err;
1443 }
1444 } else if (strpbrk_esq(buf, "/."))
1445 lr->file = strdup_esq(buf);
1446 else if (is_c_func_name(buf))/* We reuse it for checking funcname */
1447 lr->function = strdup_esq(buf);
1448 else { /* Invalid name */
1449 semantic_error("'%s' is not a valid function name.\n", buf);
1450 err = -EINVAL;
1451 goto err;
1452 }
1453
1454 err:
1455 free(buf);
1456 return err;
1457 }
1458
1459 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1460 {
1461 char *ptr;
1462
1463 ptr = strpbrk_esq(*arg, ":");
1464 if (ptr) {
1465 *ptr = '\0';
1466 if (!pev->sdt && !is_c_func_name(*arg))
1467 goto ng_name;
1468 pev->group = strdup_esq(*arg);
1469 if (!pev->group)
1470 return -ENOMEM;
1471 *arg = ptr + 1;
1472 } else
1473 pev->group = NULL;
1474
1475 pev->event = strdup_esq(*arg);
1476 if (pev->event == NULL)
1477 return -ENOMEM;
1478
1479 if (!pev->sdt && !is_c_func_name(pev->event)) {
1480 zfree(&pev->event);
1481 ng_name:
1482 zfree(&pev->group);
1483 semantic_error("%s is bad for event name -it must "
1484 "follow C symbol-naming rule.\n", *arg);
1485 return -EINVAL;
1486 }
1487 return 0;
1488 }
1489
1490 /* Parse probepoint definition. */
1491 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1492 {
1493 struct perf_probe_point *pp = &pev->point;
1494 char *ptr, *tmp;
1495 char c, nc = 0;
1496 bool file_spec = false;
1497 int ret;
1498
1499 /*
1500 * <Syntax>
1501 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1502 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1503 * perf probe %[GRP:]SDT_EVENT
1504 */
1505 if (!arg)
1506 return -EINVAL;
1507
1508 if (is_sdt_event(arg)) {
1509 pev->sdt = true;
1510 if (arg[0] == '%')
1511 arg++;
1512 }
1513
1514 ptr = strpbrk_esq(arg, ";=@+%");
1515 if (pev->sdt) {
1516 if (ptr) {
1517 if (*ptr != '@') {
1518 semantic_error("%s must be an SDT name.\n",
1519 arg);
1520 return -EINVAL;
1521 }
1522 /* This must be a target file name or build id */
1523 tmp = build_id_cache__complement(ptr + 1);
1524 if (tmp) {
1525 pev->target = build_id_cache__origname(tmp);
1526 free(tmp);
1527 } else
1528 pev->target = strdup_esq(ptr + 1);
1529 if (!pev->target)
1530 return -ENOMEM;
1531 *ptr = '\0';
1532 }
1533 ret = parse_perf_probe_event_name(&arg, pev);
1534 if (ret == 0) {
1535 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1536 ret = -errno;
1537 }
1538 return ret;
1539 }
1540
1541 if (ptr && *ptr == '=') { /* Event name */
1542 *ptr = '\0';
1543 tmp = ptr + 1;
1544 ret = parse_perf_probe_event_name(&arg, pev);
1545 if (ret < 0)
1546 return ret;
1547
1548 arg = tmp;
1549 }
1550
1551 /*
1552 * Check arg is function or file name and copy it.
1553 *
1554 * We consider arg to be a file spec if and only if it satisfies
1555 * all of the below criteria::
1556 * - it does not include any of "+@%",
1557 * - it includes one of ":;", and
1558 * - it has a period '.' in the name.
1559 *
1560 * Otherwise, we consider arg to be a function specification.
1561 */
1562 if (!strpbrk_esc(arg, "+@%")) {
1563 ptr = strpbrk_esc(arg, ";:");
1564 /* This is a file spec if it includes a '.' before ; or : */
1565 if (ptr && memchr(arg, '.', ptr - arg))
1566 file_spec = true;
1567 }
1568
1569 ptr = strpbrk_esq(arg, ";:+@%");
1570 if (ptr) {
1571 nc = *ptr;
1572 *ptr++ = '\0';
1573 }
1574
1575 if (arg[0] == '\0')
1576 tmp = NULL;
1577 else {
1578 tmp = strdup_esq(arg);
1579 if (tmp == NULL)
1580 return -ENOMEM;
1581 }
1582
1583 if (file_spec)
1584 pp->file = tmp;
1585 else {
1586 pp->function = tmp;
1587
1588 /*
1589 * Keep pp->function even if this is absolute address,
1590 * so it can mark whether abs_address is valid.
1591 * Which make 'perf probe lib.bin 0x0' possible.
1592 *
1593 * Note that checking length of tmp is not needed
1594 * because when we access tmp[1] we know tmp[0] is '0',
1595 * so tmp[1] should always valid (but could be '\0').
1596 */
1597 if (tmp && !strncmp(tmp, "0x", 2)) {
1598 pp->abs_address = strtoull(pp->function, &tmp, 0);
1599 if (*tmp != '\0') {
1600 semantic_error("Invalid absolute address.\n");
1601 return -EINVAL;
1602 }
1603 }
1604 }
1605
1606 /* Parse other options */
1607 while (ptr) {
1608 arg = ptr;
1609 c = nc;
1610 if (c == ';') { /* Lazy pattern must be the last part */
1611 pp->lazy_line = strdup(arg); /* let leave escapes */
1612 if (pp->lazy_line == NULL)
1613 return -ENOMEM;
1614 break;
1615 }
1616 ptr = strpbrk_esq(arg, ";:+@%");
1617 if (ptr) {
1618 nc = *ptr;
1619 *ptr++ = '\0';
1620 }
1621 switch (c) {
1622 case ':': /* Line number */
1623 pp->line = strtoul(arg, &tmp, 0);
1624 if (*tmp != '\0') {
1625 semantic_error("There is non-digit char"
1626 " in line number.\n");
1627 return -EINVAL;
1628 }
1629 break;
1630 case '+': /* Byte offset from a symbol */
1631 pp->offset = strtoul(arg, &tmp, 0);
1632 if (*tmp != '\0') {
1633 semantic_error("There is non-digit character"
1634 " in offset.\n");
1635 return -EINVAL;
1636 }
1637 break;
1638 case '@': /* File name */
1639 if (pp->file) {
1640 semantic_error("SRC@SRC is not allowed.\n");
1641 return -EINVAL;
1642 }
1643 if (!strcmp(arg, "*"))
1644 break;
1645 pp->file = strdup_esq(arg);
1646 if (pp->file == NULL)
1647 return -ENOMEM;
1648 break;
1649 case '%': /* Probe places */
1650 if (strcmp(arg, "return") == 0) {
1651 pp->retprobe = 1;
1652 } else { /* Others not supported yet */
1653 semantic_error("%%%s is not supported.\n", arg);
1654 return -ENOTSUP;
1655 }
1656 break;
1657 default: /* Buggy case */
1658 pr_err("This program has a bug at %s:%d.\n",
1659 __FILE__, __LINE__);
1660 return -ENOTSUP;
1661 break;
1662 }
1663 }
1664
1665 /* Exclusion check */
1666 if (pp->lazy_line && pp->line) {
1667 semantic_error("Lazy pattern can't be used with"
1668 " line number.\n");
1669 return -EINVAL;
1670 }
1671
1672 if (pp->lazy_line && pp->offset) {
1673 semantic_error("Lazy pattern can't be used with offset.\n");
1674 return -EINVAL;
1675 }
1676
1677 if (pp->line && pp->offset) {
1678 semantic_error("Offset can't be used with line number.\n");
1679 return -EINVAL;
1680 }
1681
1682 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1683 semantic_error("File always requires line number or "
1684 "lazy pattern.\n");
1685 return -EINVAL;
1686 }
1687
1688 if (pp->offset && !pp->function) {
1689 semantic_error("Offset requires an entry function.\n");
1690 return -EINVAL;
1691 }
1692
1693 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1694 semantic_error("Offset/Line/Lazy pattern can't be used with "
1695 "return probe.\n");
1696 return -EINVAL;
1697 }
1698
1699 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1700 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1701 pp->lazy_line);
1702 return 0;
1703 }
1704
1705 /* Parse perf-probe event argument */
1706 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1707 {
1708 char *tmp, *goodname;
1709 struct perf_probe_arg_field **fieldp;
1710
1711 pr_debug("parsing arg: %s into ", str);
1712
1713 tmp = strchr(str, '=');
1714 if (tmp) {
1715 arg->name = strndup(str, tmp - str);
1716 if (arg->name == NULL)
1717 return -ENOMEM;
1718 pr_debug("name:%s ", arg->name);
1719 str = tmp + 1;
1720 }
1721
1722 tmp = strchr(str, '@');
1723 if (tmp && tmp != str && !strcmp(tmp + 1, "user")) { /* user attr */
1724 if (!user_access_is_supported()) {
1725 semantic_error("ftrace does not support user access\n");
1726 return -EINVAL;
1727 }
1728 *tmp = '\0';
1729 arg->user_access = true;
1730 pr_debug("user_access ");
1731 }
1732
1733 tmp = strchr(str, ':');
1734 if (tmp) { /* Type setting */
1735 *tmp = '\0';
1736 arg->type = strdup(tmp + 1);
1737 if (arg->type == NULL)
1738 return -ENOMEM;
1739 pr_debug("type:%s ", arg->type);
1740 }
1741
1742 tmp = strpbrk(str, "-.[");
1743 if (!is_c_varname(str) || !tmp) {
1744 /* A variable, register, symbol or special value */
1745 arg->var = strdup(str);
1746 if (arg->var == NULL)
1747 return -ENOMEM;
1748 pr_debug("%s\n", arg->var);
1749 return 0;
1750 }
1751
1752 /* Structure fields or array element */
1753 arg->var = strndup(str, tmp - str);
1754 if (arg->var == NULL)
1755 return -ENOMEM;
1756 goodname = arg->var;
1757 pr_debug("%s, ", arg->var);
1758 fieldp = &arg->field;
1759
1760 do {
1761 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1762 if (*fieldp == NULL)
1763 return -ENOMEM;
1764 if (*tmp == '[') { /* Array */
1765 str = tmp;
1766 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1767 (*fieldp)->ref = true;
1768 if (*tmp != ']' || tmp == str + 1) {
1769 semantic_error("Array index must be a"
1770 " number.\n");
1771 return -EINVAL;
1772 }
1773 tmp++;
1774 if (*tmp == '\0')
1775 tmp = NULL;
1776 } else { /* Structure */
1777 if (*tmp == '.') {
1778 str = tmp + 1;
1779 (*fieldp)->ref = false;
1780 } else if (tmp[1] == '>') {
1781 str = tmp + 2;
1782 (*fieldp)->ref = true;
1783 } else {
1784 semantic_error("Argument parse error: %s\n",
1785 str);
1786 return -EINVAL;
1787 }
1788 tmp = strpbrk(str, "-.[");
1789 }
1790 if (tmp) {
1791 (*fieldp)->name = strndup(str, tmp - str);
1792 if ((*fieldp)->name == NULL)
1793 return -ENOMEM;
1794 if (*str != '[')
1795 goodname = (*fieldp)->name;
1796 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1797 fieldp = &(*fieldp)->next;
1798 }
1799 } while (tmp);
1800 (*fieldp)->name = strdup(str);
1801 if ((*fieldp)->name == NULL)
1802 return -ENOMEM;
1803 if (*str != '[')
1804 goodname = (*fieldp)->name;
1805 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1806
1807 /* If no name is specified, set the last field name (not array index)*/
1808 if (!arg->name) {
1809 arg->name = strdup(goodname);
1810 if (arg->name == NULL)
1811 return -ENOMEM;
1812 }
1813 return 0;
1814 }
1815
1816 /* Parse perf-probe event command */
1817 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1818 {
1819 char **argv;
1820 int argc, i, ret = 0;
1821
1822 argv = argv_split(cmd, &argc);
1823 if (!argv) {
1824 pr_debug("Failed to split arguments.\n");
1825 return -ENOMEM;
1826 }
1827 if (argc - 1 > MAX_PROBE_ARGS) {
1828 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1829 ret = -ERANGE;
1830 goto out;
1831 }
1832 /* Parse probe point */
1833 ret = parse_perf_probe_point(argv[0], pev);
1834 if (ret < 0)
1835 goto out;
1836
1837 /* Generate event name if needed */
1838 if (!pev->event && pev->point.function && pev->point.line
1839 && !pev->point.lazy_line && !pev->point.offset) {
1840 if (asprintf(&pev->event, "%s_L%d", pev->point.function,
1841 pev->point.line) < 0) {
1842 ret = -ENOMEM;
1843 goto out;
1844 }
1845 }
1846
1847 /* Copy arguments and ensure return probe has no C argument */
1848 pev->nargs = argc - 1;
1849 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1850 if (pev->args == NULL) {
1851 ret = -ENOMEM;
1852 goto out;
1853 }
1854 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1855 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1856 if (ret >= 0 &&
1857 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1858 semantic_error("You can't specify local variable for"
1859 " kretprobe.\n");
1860 ret = -EINVAL;
1861 }
1862 }
1863 out:
1864 argv_free(argv);
1865
1866 return ret;
1867 }
1868
1869 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1870 bool perf_probe_with_var(struct perf_probe_event *pev)
1871 {
1872 int i = 0;
1873
1874 for (i = 0; i < pev->nargs; i++)
1875 if (is_c_varname(pev->args[i].var) ||
1876 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1877 !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1878 return true;
1879 return false;
1880 }
1881
1882 /* Return true if this perf_probe_event requires debuginfo */
1883 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1884 {
1885 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1886 return true;
1887
1888 if (perf_probe_with_var(pev))
1889 return true;
1890
1891 return false;
1892 }
1893
1894 /* Parse probe_events event into struct probe_point */
1895 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1896 {
1897 struct probe_trace_point *tp = &tev->point;
1898 char pr;
1899 char *p;
1900 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1901 int ret, i, argc;
1902 char **argv;
1903
1904 pr_debug("Parsing probe_events: %s\n", cmd);
1905 argv = argv_split(cmd, &argc);
1906 if (!argv) {
1907 pr_debug("Failed to split arguments.\n");
1908 return -ENOMEM;
1909 }
1910 if (argc < 2) {
1911 semantic_error("Too few probe arguments.\n");
1912 ret = -ERANGE;
1913 goto out;
1914 }
1915
1916 /* Scan event and group name. */
1917 argv0_str = strdup(argv[0]);
1918 if (argv0_str == NULL) {
1919 ret = -ENOMEM;
1920 goto out;
1921 }
1922 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1923 fmt2_str = strtok_r(NULL, "/", &fmt);
1924 fmt3_str = strtok_r(NULL, " \t", &fmt);
1925 if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
1926 semantic_error("Failed to parse event name: %s\n", argv[0]);
1927 ret = -EINVAL;
1928 goto out;
1929 }
1930 pr = fmt1_str[0];
1931 tev->group = strdup(fmt2_str);
1932 tev->event = strdup(fmt3_str);
1933 if (tev->group == NULL || tev->event == NULL) {
1934 ret = -ENOMEM;
1935 goto out;
1936 }
1937 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1938
1939 tp->retprobe = (pr == 'r');
1940
1941 /* Scan module name(if there), function name and offset */
1942 p = strchr(argv[1], ':');
1943 if (p) {
1944 tp->module = strndup(argv[1], p - argv[1]);
1945 if (!tp->module) {
1946 ret = -ENOMEM;
1947 goto out;
1948 }
1949 tev->uprobes = (tp->module[0] == '/');
1950 p++;
1951 } else
1952 p = argv[1];
1953 fmt1_str = strtok_r(p, "+", &fmt);
1954 /* only the address started with 0x */
1955 if (fmt1_str[0] == '0') {
1956 /*
1957 * Fix a special case:
1958 * if address == 0, kernel reports something like:
1959 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1960 * Newer kernel may fix that, but we want to
1961 * support old kernel also.
1962 */
1963 if (strcmp(fmt1_str, "0x") == 0) {
1964 if (!argv[2] || strcmp(argv[2], "(null)")) {
1965 ret = -EINVAL;
1966 goto out;
1967 }
1968 tp->address = 0;
1969
1970 free(argv[2]);
1971 for (i = 2; argv[i + 1] != NULL; i++)
1972 argv[i] = argv[i + 1];
1973
1974 argv[i] = NULL;
1975 argc -= 1;
1976 } else
1977 tp->address = strtoull(fmt1_str, NULL, 0);
1978 } else {
1979 /* Only the symbol-based probe has offset */
1980 tp->symbol = strdup(fmt1_str);
1981 if (tp->symbol == NULL) {
1982 ret = -ENOMEM;
1983 goto out;
1984 }
1985 fmt2_str = strtok_r(NULL, "", &fmt);
1986 if (fmt2_str == NULL)
1987 tp->offset = 0;
1988 else
1989 tp->offset = strtoul(fmt2_str, NULL, 10);
1990 }
1991
1992 if (tev->uprobes) {
1993 fmt2_str = strchr(p, '(');
1994 if (fmt2_str)
1995 tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0);
1996 }
1997
1998 tev->nargs = argc - 2;
1999 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
2000 if (tev->args == NULL) {
2001 ret = -ENOMEM;
2002 goto out;
2003 }
2004 for (i = 0; i < tev->nargs; i++) {
2005 p = strchr(argv[i + 2], '=');
2006 if (p) /* We don't need which register is assigned. */
2007 *p++ = '\0';
2008 else
2009 p = argv[i + 2];
2010 tev->args[i].name = strdup(argv[i + 2]);
2011 /* TODO: parse regs and offset */
2012 tev->args[i].value = strdup(p);
2013 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
2014 ret = -ENOMEM;
2015 goto out;
2016 }
2017 }
2018 ret = 0;
2019 out:
2020 free(argv0_str);
2021 argv_free(argv);
2022 return ret;
2023 }
2024
2025 /* Compose only probe arg */
2026 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
2027 {
2028 struct perf_probe_arg_field *field = pa->field;
2029 struct strbuf buf;
2030 char *ret = NULL;
2031 int err;
2032
2033 if (strbuf_init(&buf, 64) < 0)
2034 return NULL;
2035
2036 if (pa->name && pa->var)
2037 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
2038 else
2039 err = strbuf_addstr(&buf, pa->name ?: pa->var);
2040 if (err)
2041 goto out;
2042
2043 while (field) {
2044 if (field->name[0] == '[')
2045 err = strbuf_addstr(&buf, field->name);
2046 else
2047 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
2048 field->name);
2049 field = field->next;
2050 if (err)
2051 goto out;
2052 }
2053
2054 if (pa->type)
2055 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
2056 goto out;
2057
2058 ret = strbuf_detach(&buf, NULL);
2059 out:
2060 strbuf_release(&buf);
2061 return ret;
2062 }
2063
2064 /* Compose only probe point (not argument) */
2065 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
2066 {
2067 struct strbuf buf;
2068 char *tmp, *ret = NULL;
2069 int len, err = 0;
2070
2071 if (strbuf_init(&buf, 64) < 0)
2072 return NULL;
2073
2074 if (pp->function) {
2075 if (strbuf_addstr(&buf, pp->function) < 0)
2076 goto out;
2077 if (pp->offset)
2078 err = strbuf_addf(&buf, "+%lu", pp->offset);
2079 else if (pp->line)
2080 err = strbuf_addf(&buf, ":%d", pp->line);
2081 else if (pp->retprobe)
2082 err = strbuf_addstr(&buf, "%return");
2083 if (err)
2084 goto out;
2085 }
2086 if (pp->file) {
2087 tmp = pp->file;
2088 len = strlen(tmp);
2089 if (len > 30) {
2090 tmp = strchr(pp->file + len - 30, '/');
2091 tmp = tmp ? tmp + 1 : pp->file + len - 30;
2092 }
2093 err = strbuf_addf(&buf, "@%s", tmp);
2094 if (!err && !pp->function && pp->line)
2095 err = strbuf_addf(&buf, ":%d", pp->line);
2096 }
2097 if (!err)
2098 ret = strbuf_detach(&buf, NULL);
2099 out:
2100 strbuf_release(&buf);
2101 return ret;
2102 }
2103
2104 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
2105 {
2106 struct strbuf buf;
2107 char *tmp, *ret = NULL;
2108 int i;
2109
2110 if (strbuf_init(&buf, 64))
2111 return NULL;
2112 if (pev->event)
2113 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
2114 pev->event) < 0)
2115 goto out;
2116
2117 tmp = synthesize_perf_probe_point(&pev->point);
2118 if (!tmp || strbuf_addstr(&buf, tmp) < 0) {
2119 free(tmp);
2120 goto out;
2121 }
2122 free(tmp);
2123
2124 for (i = 0; i < pev->nargs; i++) {
2125 tmp = synthesize_perf_probe_arg(pev->args + i);
2126 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) {
2127 free(tmp);
2128 goto out;
2129 }
2130 free(tmp);
2131 }
2132
2133 ret = strbuf_detach(&buf, NULL);
2134 out:
2135 strbuf_release(&buf);
2136 return ret;
2137 }
2138
2139 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
2140 struct strbuf *buf, int depth)
2141 {
2142 int err;
2143 if (ref->next) {
2144 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
2145 depth + 1);
2146 if (depth < 0)
2147 return depth;
2148 }
2149 if (ref->user_access)
2150 err = strbuf_addf(buf, "%s%ld(", "+u", ref->offset);
2151 else
2152 err = strbuf_addf(buf, "%+ld(", ref->offset);
2153 return (err < 0) ? err : depth;
2154 }
2155
2156 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
2157 struct strbuf *buf)
2158 {
2159 struct probe_trace_arg_ref *ref = arg->ref;
2160 int depth = 0, err;
2161
2162 /* Argument name or separator */
2163 if (arg->name)
2164 err = strbuf_addf(buf, " %s=", arg->name);
2165 else
2166 err = strbuf_addch(buf, ' ');
2167 if (err)
2168 return err;
2169
2170 /* Special case: @XXX */
2171 if (arg->value[0] == '@' && arg->ref)
2172 ref = ref->next;
2173
2174 /* Dereferencing arguments */
2175 if (ref) {
2176 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
2177 if (depth < 0)
2178 return depth;
2179 }
2180
2181 /* Print argument value */
2182 if (arg->value[0] == '@' && arg->ref)
2183 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2184 else
2185 err = strbuf_addstr(buf, arg->value);
2186
2187 /* Closing */
2188 while (!err && depth--)
2189 err = strbuf_addch(buf, ')');
2190
2191 /* Print argument type */
2192 if (!err && arg->type)
2193 err = strbuf_addf(buf, ":%s", arg->type);
2194
2195 return err;
2196 }
2197
2198 static int
2199 synthesize_probe_trace_args(struct probe_trace_event *tev, struct strbuf *buf)
2200 {
2201 int i, ret = 0;
2202
2203 for (i = 0; i < tev->nargs && ret >= 0; i++)
2204 ret = synthesize_probe_trace_arg(&tev->args[i], buf);
2205
2206 return ret;
2207 }
2208
2209 static int
2210 synthesize_uprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf)
2211 {
2212 int err;
2213
2214 /* Uprobes must have tp->module */
2215 if (!tp->module)
2216 return -EINVAL;
2217 /*
2218 * If tp->address == 0, then this point must be a
2219 * absolute address uprobe.
2220 * try_to_find_absolute_address() should have made
2221 * tp->symbol to "0x0".
2222 */
2223 if (!tp->address && (!tp->symbol || strcmp(tp->symbol, "0x0")))
2224 return -EINVAL;
2225
2226 /* Use the tp->address for uprobes */
2227 err = strbuf_addf(buf, "%s:0x%" PRIx64, tp->module, tp->address);
2228
2229 if (err >= 0 && tp->ref_ctr_offset) {
2230 if (!uprobe_ref_ctr_is_supported())
2231 return -EINVAL;
2232 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
2233 }
2234 return err >= 0 ? 0 : err;
2235 }
2236
2237 static int
2238 synthesize_kprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf)
2239 {
2240 if (!strncmp(tp->symbol, "0x", 2)) {
2241 /* Absolute address. See try_to_find_absolute_address() */
2242 return strbuf_addf(buf, "%s%s0x%" PRIx64, tp->module ?: "",
2243 tp->module ? ":" : "", tp->address);
2244 } else {
2245 return strbuf_addf(buf, "%s%s%s+%lu", tp->module ?: "",
2246 tp->module ? ":" : "", tp->symbol, tp->offset);
2247 }
2248 }
2249
2250 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2251 {
2252 struct probe_trace_point *tp = &tev->point;
2253 struct strbuf buf;
2254 char *ret = NULL;
2255 int err;
2256
2257 if (strbuf_init(&buf, 32) < 0)
2258 return NULL;
2259
2260 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2261 tev->group, tev->event) < 0)
2262 goto error;
2263
2264 if (tev->uprobes)
2265 err = synthesize_uprobe_trace_def(tp, &buf);
2266 else
2267 err = synthesize_kprobe_trace_def(tp, &buf);
2268
2269 if (err >= 0)
2270 err = synthesize_probe_trace_args(tev, &buf);
2271
2272 if (err >= 0)
2273 ret = strbuf_detach(&buf, NULL);
2274 error:
2275 strbuf_release(&buf);
2276 return ret;
2277 }
2278
2279 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2280 struct perf_probe_point *pp,
2281 bool is_kprobe)
2282 {
2283 struct symbol *sym = NULL;
2284 struct map *map = NULL;
2285 u64 addr = tp->address;
2286 int ret = -ENOENT;
2287
2288 if (!is_kprobe) {
2289 map = dso__new_map(tp->module);
2290 if (!map)
2291 goto out;
2292 sym = map__find_symbol(map, addr);
2293 } else {
2294 if (tp->symbol && !addr) {
2295 if (kernel_get_symbol_address_by_name(tp->symbol,
2296 &addr, true, false) < 0)
2297 goto out;
2298 }
2299 if (addr) {
2300 addr += tp->offset;
2301 sym = machine__find_kernel_symbol(host_machine, addr, &map);
2302 }
2303 }
2304
2305 if (!sym)
2306 goto out;
2307
2308 pp->retprobe = tp->retprobe;
2309 pp->offset = addr - map__unmap_ip(map, sym->start);
2310 pp->function = strdup(sym->name);
2311 ret = pp->function ? 0 : -ENOMEM;
2312
2313 out:
2314 map__put(map);
2315
2316 return ret;
2317 }
2318
2319 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2320 struct perf_probe_point *pp,
2321 bool is_kprobe)
2322 {
2323 char buf[128];
2324 int ret;
2325
2326 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2327 if (!ret)
2328 return 0;
2329 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2330 if (!ret)
2331 return 0;
2332
2333 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2334
2335 if (tp->symbol) {
2336 pp->function = strdup(tp->symbol);
2337 pp->offset = tp->offset;
2338 } else {
2339 ret = e_snprintf(buf, 128, "0x%" PRIx64, tp->address);
2340 if (ret < 0)
2341 return ret;
2342 pp->function = strdup(buf);
2343 pp->offset = 0;
2344 }
2345 if (pp->function == NULL)
2346 return -ENOMEM;
2347
2348 pp->retprobe = tp->retprobe;
2349
2350 return 0;
2351 }
2352
2353 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2354 struct perf_probe_event *pev, bool is_kprobe)
2355 {
2356 struct strbuf buf = STRBUF_INIT;
2357 int i, ret;
2358
2359 /* Convert event/group name */
2360 pev->event = strdup(tev->event);
2361 pev->group = strdup(tev->group);
2362 if (pev->event == NULL || pev->group == NULL)
2363 return -ENOMEM;
2364
2365 /* Convert trace_point to probe_point */
2366 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2367 if (ret < 0)
2368 return ret;
2369
2370 /* Convert trace_arg to probe_arg */
2371 pev->nargs = tev->nargs;
2372 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2373 if (pev->args == NULL)
2374 return -ENOMEM;
2375 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2376 if (tev->args[i].name)
2377 pev->args[i].name = strdup(tev->args[i].name);
2378 else {
2379 if ((ret = strbuf_init(&buf, 32)) < 0)
2380 goto error;
2381 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2382 pev->args[i].name = strbuf_detach(&buf, NULL);
2383 }
2384 if (pev->args[i].name == NULL && ret >= 0)
2385 ret = -ENOMEM;
2386 }
2387 error:
2388 if (ret < 0)
2389 clear_perf_probe_event(pev);
2390
2391 return ret;
2392 }
2393
2394 void clear_perf_probe_event(struct perf_probe_event *pev)
2395 {
2396 struct perf_probe_arg_field *field, *next;
2397 int i;
2398
2399 zfree(&pev->event);
2400 zfree(&pev->group);
2401 zfree(&pev->target);
2402 clear_perf_probe_point(&pev->point);
2403
2404 for (i = 0; i < pev->nargs; i++) {
2405 zfree(&pev->args[i].name);
2406 zfree(&pev->args[i].var);
2407 zfree(&pev->args[i].type);
2408 field = pev->args[i].field;
2409 while (field) {
2410 next = field->next;
2411 zfree(&field->name);
2412 free(field);
2413 field = next;
2414 }
2415 }
2416 pev->nargs = 0;
2417 zfree(&pev->args);
2418 }
2419
2420 #define strdup_or_goto(str, label) \
2421 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2422
2423 static int perf_probe_point__copy(struct perf_probe_point *dst,
2424 struct perf_probe_point *src)
2425 {
2426 dst->file = strdup_or_goto(src->file, out_err);
2427 dst->function = strdup_or_goto(src->function, out_err);
2428 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2429 dst->line = src->line;
2430 dst->retprobe = src->retprobe;
2431 dst->offset = src->offset;
2432 return 0;
2433
2434 out_err:
2435 clear_perf_probe_point(dst);
2436 return -ENOMEM;
2437 }
2438
2439 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2440 struct perf_probe_arg *src)
2441 {
2442 struct perf_probe_arg_field *field, **ppfield;
2443
2444 dst->name = strdup_or_goto(src->name, out_err);
2445 dst->var = strdup_or_goto(src->var, out_err);
2446 dst->type = strdup_or_goto(src->type, out_err);
2447
2448 field = src->field;
2449 ppfield = &(dst->field);
2450 while (field) {
2451 *ppfield = zalloc(sizeof(*field));
2452 if (!*ppfield)
2453 goto out_err;
2454 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2455 (*ppfield)->index = field->index;
2456 (*ppfield)->ref = field->ref;
2457 field = field->next;
2458 ppfield = &((*ppfield)->next);
2459 }
2460 return 0;
2461 out_err:
2462 return -ENOMEM;
2463 }
2464
2465 int perf_probe_event__copy(struct perf_probe_event *dst,
2466 struct perf_probe_event *src)
2467 {
2468 int i;
2469
2470 dst->event = strdup_or_goto(src->event, out_err);
2471 dst->group = strdup_or_goto(src->group, out_err);
2472 dst->target = strdup_or_goto(src->target, out_err);
2473 dst->uprobes = src->uprobes;
2474
2475 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2476 goto out_err;
2477
2478 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2479 if (!dst->args)
2480 goto out_err;
2481 dst->nargs = src->nargs;
2482
2483 for (i = 0; i < src->nargs; i++)
2484 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2485 goto out_err;
2486 return 0;
2487
2488 out_err:
2489 clear_perf_probe_event(dst);
2490 return -ENOMEM;
2491 }
2492
2493 void clear_probe_trace_event(struct probe_trace_event *tev)
2494 {
2495 struct probe_trace_arg_ref *ref, *next;
2496 int i;
2497
2498 zfree(&tev->event);
2499 zfree(&tev->group);
2500 zfree(&tev->point.symbol);
2501 zfree(&tev->point.realname);
2502 zfree(&tev->point.module);
2503 for (i = 0; i < tev->nargs; i++) {
2504 zfree(&tev->args[i].name);
2505 zfree(&tev->args[i].value);
2506 zfree(&tev->args[i].type);
2507 ref = tev->args[i].ref;
2508 while (ref) {
2509 next = ref->next;
2510 free(ref);
2511 ref = next;
2512 }
2513 }
2514 zfree(&tev->args);
2515 tev->nargs = 0;
2516 }
2517
2518 struct kprobe_blacklist_node {
2519 struct list_head list;
2520 u64 start;
2521 u64 end;
2522 char *symbol;
2523 };
2524
2525 static void kprobe_blacklist__delete(struct list_head *blacklist)
2526 {
2527 struct kprobe_blacklist_node *node;
2528
2529 while (!list_empty(blacklist)) {
2530 node = list_first_entry(blacklist,
2531 struct kprobe_blacklist_node, list);
2532 list_del_init(&node->list);
2533 zfree(&node->symbol);
2534 free(node);
2535 }
2536 }
2537
2538 static int kprobe_blacklist__load(struct list_head *blacklist)
2539 {
2540 struct kprobe_blacklist_node *node;
2541 const char *__debugfs = debugfs__mountpoint();
2542 char buf[PATH_MAX], *p;
2543 FILE *fp;
2544 int ret;
2545
2546 if (__debugfs == NULL)
2547 return -ENOTSUP;
2548
2549 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2550 if (ret < 0)
2551 return ret;
2552
2553 fp = fopen(buf, "r");
2554 if (!fp)
2555 return -errno;
2556
2557 ret = 0;
2558 while (fgets(buf, PATH_MAX, fp)) {
2559 node = zalloc(sizeof(*node));
2560 if (!node) {
2561 ret = -ENOMEM;
2562 break;
2563 }
2564 INIT_LIST_HEAD(&node->list);
2565 list_add_tail(&node->list, blacklist);
2566 if (sscanf(buf, "0x%" PRIx64 "-0x%" PRIx64, &node->start, &node->end) != 2) {
2567 ret = -EINVAL;
2568 break;
2569 }
2570 p = strchr(buf, '\t');
2571 if (p) {
2572 p++;
2573 if (p[strlen(p) - 1] == '\n')
2574 p[strlen(p) - 1] = '\0';
2575 } else
2576 p = (char *)"unknown";
2577 node->symbol = strdup(p);
2578 if (!node->symbol) {
2579 ret = -ENOMEM;
2580 break;
2581 }
2582 pr_debug2("Blacklist: 0x%" PRIx64 "-0x%" PRIx64 ", %s\n",
2583 node->start, node->end, node->symbol);
2584 ret++;
2585 }
2586 if (ret < 0)
2587 kprobe_blacklist__delete(blacklist);
2588 fclose(fp);
2589
2590 return ret;
2591 }
2592
2593 static struct kprobe_blacklist_node *
2594 kprobe_blacklist__find_by_address(struct list_head *blacklist, u64 address)
2595 {
2596 struct kprobe_blacklist_node *node;
2597
2598 list_for_each_entry(node, blacklist, list) {
2599 if (node->start <= address && address < node->end)
2600 return node;
2601 }
2602
2603 return NULL;
2604 }
2605
2606 static LIST_HEAD(kprobe_blacklist);
2607
2608 static void kprobe_blacklist__init(void)
2609 {
2610 if (!list_empty(&kprobe_blacklist))
2611 return;
2612
2613 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2614 pr_debug("No kprobe blacklist support, ignored\n");
2615 }
2616
2617 static void kprobe_blacklist__release(void)
2618 {
2619 kprobe_blacklist__delete(&kprobe_blacklist);
2620 }
2621
2622 static bool kprobe_blacklist__listed(u64 address)
2623 {
2624 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2625 }
2626
2627 static int perf_probe_event__sprintf(const char *group, const char *event,
2628 struct perf_probe_event *pev,
2629 const char *module,
2630 struct strbuf *result)
2631 {
2632 int i, ret;
2633 char *buf;
2634
2635 if (asprintf(&buf, "%s:%s", group, event) < 0)
2636 return -errno;
2637 ret = strbuf_addf(result, " %-20s (on ", buf);
2638 free(buf);
2639 if (ret)
2640 return ret;
2641
2642 /* Synthesize only event probe point */
2643 buf = synthesize_perf_probe_point(&pev->point);
2644 if (!buf)
2645 return -ENOMEM;
2646 ret = strbuf_addstr(result, buf);
2647 free(buf);
2648
2649 if (!ret && module)
2650 ret = strbuf_addf(result, " in %s", module);
2651
2652 if (!ret && pev->nargs > 0) {
2653 ret = strbuf_add(result, " with", 5);
2654 for (i = 0; !ret && i < pev->nargs; i++) {
2655 buf = synthesize_perf_probe_arg(&pev->args[i]);
2656 if (!buf)
2657 return -ENOMEM;
2658 ret = strbuf_addf(result, " %s", buf);
2659 free(buf);
2660 }
2661 }
2662 if (!ret)
2663 ret = strbuf_addch(result, ')');
2664
2665 return ret;
2666 }
2667
2668 /* Show an event */
2669 int show_perf_probe_event(const char *group, const char *event,
2670 struct perf_probe_event *pev,
2671 const char *module, bool use_stdout)
2672 {
2673 struct strbuf buf = STRBUF_INIT;
2674 int ret;
2675
2676 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2677 if (ret >= 0) {
2678 if (use_stdout)
2679 printf("%s\n", buf.buf);
2680 else
2681 pr_info("%s\n", buf.buf);
2682 }
2683 strbuf_release(&buf);
2684
2685 return ret;
2686 }
2687
2688 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2689 struct strfilter *filter)
2690 {
2691 char tmp[128];
2692
2693 /* At first, check the event name itself */
2694 if (strfilter__compare(filter, tev->event))
2695 return true;
2696
2697 /* Next, check the combination of name and group */
2698 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2699 return false;
2700 return strfilter__compare(filter, tmp);
2701 }
2702
2703 static int __show_perf_probe_events(int fd, bool is_kprobe,
2704 struct strfilter *filter)
2705 {
2706 int ret = 0;
2707 struct probe_trace_event tev;
2708 struct perf_probe_event pev;
2709 struct strlist *rawlist;
2710 struct str_node *ent;
2711
2712 memset(&tev, 0, sizeof(tev));
2713 memset(&pev, 0, sizeof(pev));
2714
2715 rawlist = probe_file__get_rawlist(fd);
2716 if (!rawlist)
2717 return -ENOMEM;
2718
2719 strlist__for_each_entry(ent, rawlist) {
2720 ret = parse_probe_trace_command(ent->s, &tev);
2721 if (ret >= 0) {
2722 if (!filter_probe_trace_event(&tev, filter))
2723 goto next;
2724 ret = convert_to_perf_probe_event(&tev, &pev,
2725 is_kprobe);
2726 if (ret < 0)
2727 goto next;
2728 ret = show_perf_probe_event(pev.group, pev.event,
2729 &pev, tev.point.module,
2730 true);
2731 }
2732 next:
2733 clear_perf_probe_event(&pev);
2734 clear_probe_trace_event(&tev);
2735 if (ret < 0)
2736 break;
2737 }
2738 strlist__delete(rawlist);
2739 /* Cleanup cached debuginfo if needed */
2740 debuginfo_cache__exit();
2741
2742 return ret;
2743 }
2744
2745 /* List up current perf-probe events */
2746 int show_perf_probe_events(struct strfilter *filter)
2747 {
2748 int kp_fd, up_fd, ret;
2749
2750 setup_pager();
2751
2752 if (probe_conf.cache)
2753 return probe_cache__show_all_caches(filter);
2754
2755 ret = init_probe_symbol_maps(false);
2756 if (ret < 0)
2757 return ret;
2758
2759 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2760 if (ret < 0)
2761 return ret;
2762
2763 if (kp_fd >= 0)
2764 ret = __show_perf_probe_events(kp_fd, true, filter);
2765 if (up_fd >= 0 && ret >= 0)
2766 ret = __show_perf_probe_events(up_fd, false, filter);
2767 if (kp_fd > 0)
2768 close(kp_fd);
2769 if (up_fd > 0)
2770 close(up_fd);
2771 exit_probe_symbol_maps();
2772
2773 return ret;
2774 }
2775
2776 static int get_new_event_name(char *buf, size_t len, const char *base,
2777 struct strlist *namelist, bool ret_event,
2778 bool allow_suffix)
2779 {
2780 int i, ret;
2781 char *p, *nbase;
2782
2783 if (*base == '.')
2784 base++;
2785 nbase = strdup(base);
2786 if (!nbase)
2787 return -ENOMEM;
2788
2789 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2790 p = strpbrk(nbase, ".@");
2791 if (p && p != nbase)
2792 *p = '\0';
2793
2794 /* Try no suffix number */
2795 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2796 if (ret < 0) {
2797 pr_warning("snprintf() failed: %d; the event name '%s' is too long\n"
2798 " Hint: Set a shorter event with syntax \"EVENT=PROBEDEF\"\n"
2799 " EVENT: Event name (max length: %d bytes).\n",
2800 ret, nbase, MAX_EVENT_NAME_LEN);
2801 goto out;
2802 }
2803 if (!strlist__has_entry(namelist, buf))
2804 goto out;
2805
2806 if (!allow_suffix) {
2807 pr_warning("Error: event \"%s\" already exists.\n"
2808 " Hint: Remove existing event by 'perf probe -d'\n"
2809 " or force duplicates by 'perf probe -f'\n"
2810 " or set 'force=yes' in BPF source.\n",
2811 buf);
2812 ret = -EEXIST;
2813 goto out;
2814 }
2815
2816 /* Try to add suffix */
2817 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2818 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2819 if (ret < 0) {
2820 pr_warning("Add suffix failed: %d; the event name '%s' is too long\n"
2821 " Hint: Set a shorter event with syntax \"EVENT=PROBEDEF\"\n"
2822 " EVENT: Event name (max length: %d bytes).\n",
2823 ret, nbase, MAX_EVENT_NAME_LEN);
2824 goto out;
2825 }
2826 if (!strlist__has_entry(namelist, buf))
2827 break;
2828 }
2829 if (i == MAX_EVENT_INDEX) {
2830 pr_warning("Too many events are on the same function.\n");
2831 ret = -ERANGE;
2832 }
2833
2834 out:
2835 free(nbase);
2836
2837 /* Final validation */
2838 if (ret >= 0 && !is_c_func_name(buf)) {
2839 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2840 buf);
2841 ret = -EINVAL;
2842 }
2843
2844 return ret;
2845 }
2846
2847 /* Warn if the current kernel's uprobe implementation is old */
2848 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2849 {
2850 int i;
2851 char *buf = synthesize_probe_trace_command(tev);
2852 struct probe_trace_point *tp = &tev->point;
2853
2854 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) {
2855 pr_warning("A semaphore is associated with %s:%s and "
2856 "seems your kernel doesn't support it.\n",
2857 tev->group, tev->event);
2858 }
2859
2860 /* Old uprobe event doesn't support memory dereference */
2861 if (!tev->uprobes || tev->nargs == 0 || !buf)
2862 goto out;
2863
2864 for (i = 0; i < tev->nargs; i++) {
2865 if (strchr(tev->args[i].value, '@')) {
2866 pr_warning("%s accesses a variable by symbol name, but that is not supported for user application probe.\n",
2867 tev->args[i].value);
2868 break;
2869 }
2870 if (strglobmatch(tev->args[i].value, "[$+-]*")) {
2871 pr_warning("Please upgrade your kernel to at least 3.14 to have access to feature %s\n",
2872 tev->args[i].value);
2873 break;
2874 }
2875 }
2876 out:
2877 free(buf);
2878 }
2879
2880 /* Set new name from original perf_probe_event and namelist */
2881 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2882 struct perf_probe_event *pev,
2883 struct strlist *namelist,
2884 bool allow_suffix)
2885 {
2886 const char *event, *group;
2887 char buf[MAX_EVENT_NAME_LEN];
2888 int ret;
2889
2890 /* If probe_event or trace_event already have the name, reuse it */
2891 if (pev->event && !pev->sdt)
2892 event = pev->event;
2893 else if (tev->event)
2894 event = tev->event;
2895 else {
2896 /* Or generate new one from probe point */
2897 if (pev->point.function &&
2898 (strncmp(pev->point.function, "0x", 2) != 0) &&
2899 !strisglob(pev->point.function))
2900 event = pev->point.function;
2901 else
2902 event = tev->point.realname;
2903 }
2904 if (pev->group && !pev->sdt)
2905 group = pev->group;
2906 else if (tev->group)
2907 group = tev->group;
2908 else
2909 group = PERFPROBE_GROUP;
2910
2911 if (strlen(group) >= MAX_EVENT_NAME_LEN) {
2912 pr_err("Probe group string='%s' is too long (>= %d bytes)\n",
2913 group, MAX_EVENT_NAME_LEN);
2914 return -ENOMEM;
2915 }
2916
2917 /* Get an unused new event name */
2918 ret = get_new_event_name(buf, sizeof(buf), event, namelist,
2919 tev->point.retprobe, allow_suffix);
2920 if (ret < 0)
2921 return ret;
2922
2923 event = buf;
2924
2925 tev->event = strdup(event);
2926 tev->group = strdup(group);
2927 if (tev->event == NULL || tev->group == NULL)
2928 return -ENOMEM;
2929
2930 /*
2931 * Add new event name to namelist if multiprobe event is NOT
2932 * supported, since we have to use new event name for following
2933 * probes in that case.
2934 */
2935 if (!multiprobe_event_is_supported())
2936 strlist__add(namelist, event);
2937 return 0;
2938 }
2939
2940 static int __open_probe_file_and_namelist(bool uprobe,
2941 struct strlist **namelist)
2942 {
2943 int fd;
2944
2945 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2946 if (fd < 0)
2947 return fd;
2948
2949 /* Get current event names */
2950 *namelist = probe_file__get_namelist(fd);
2951 if (!(*namelist)) {
2952 pr_debug("Failed to get current event list.\n");
2953 close(fd);
2954 return -ENOMEM;
2955 }
2956 return fd;
2957 }
2958
2959 static int __add_probe_trace_events(struct perf_probe_event *pev,
2960 struct probe_trace_event *tevs,
2961 int ntevs, bool allow_suffix)
2962 {
2963 int i, fd[2] = {-1, -1}, up, ret;
2964 struct probe_trace_event *tev = NULL;
2965 struct probe_cache *cache = NULL;
2966 struct strlist *namelist[2] = {NULL, NULL};
2967 struct nscookie nsc;
2968
2969 up = pev->uprobes ? 1 : 0;
2970 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2971 if (fd[up] < 0)
2972 return fd[up];
2973
2974 ret = 0;
2975 for (i = 0; i < ntevs; i++) {
2976 tev = &tevs[i];
2977 up = tev->uprobes ? 1 : 0;
2978 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2979 fd[up] = __open_probe_file_and_namelist(up,
2980 &namelist[up]);
2981 if (fd[up] < 0)
2982 goto close_out;
2983 }
2984 /* Skip if the symbol is out of .text or blacklisted */
2985 if (!tev->point.symbol && !pev->uprobes)
2986 continue;
2987
2988 /* Set new name for tev (and update namelist) */
2989 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2990 allow_suffix);
2991 if (ret < 0)
2992 break;
2993
2994 nsinfo__mountns_enter(pev->nsi, &nsc);
2995 ret = probe_file__add_event(fd[up], tev);
2996 nsinfo__mountns_exit(&nsc);
2997 if (ret < 0)
2998 break;
2999
3000 /*
3001 * Probes after the first probe which comes from same
3002 * user input are always allowed to add suffix, because
3003 * there might be several addresses corresponding to
3004 * one code line.
3005 */
3006 allow_suffix = true;
3007 }
3008 if (ret == -EINVAL && pev->uprobes)
3009 warn_uprobe_event_compat(tev);
3010 if (ret == 0 && probe_conf.cache) {
3011 cache = probe_cache__new(pev->target, pev->nsi);
3012 if (!cache ||
3013 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
3014 probe_cache__commit(cache) < 0)
3015 pr_warning("Failed to add event to probe cache\n");
3016 probe_cache__delete(cache);
3017 }
3018
3019 close_out:
3020 for (up = 0; up < 2; up++) {
3021 strlist__delete(namelist[up]);
3022 if (fd[up] >= 0)
3023 close(fd[up]);
3024 }
3025 return ret;
3026 }
3027
3028 static int find_probe_functions(struct map *map, char *name,
3029 struct symbol **syms)
3030 {
3031 int found = 0;
3032 struct symbol *sym;
3033 struct rb_node *tmp;
3034 const char *norm, *ver;
3035 char *buf = NULL;
3036 bool cut_version = true;
3037
3038 if (map__load(map) < 0)
3039 return -EACCES; /* Possible permission error to load symbols */
3040
3041 /* If user gives a version, don't cut off the version from symbols */
3042 if (strchr(name, '@'))
3043 cut_version = false;
3044
3045 map__for_each_symbol(map, sym, tmp) {
3046 norm = arch__normalize_symbol_name(sym->name);
3047 if (!norm)
3048 continue;
3049
3050 if (cut_version) {
3051 /* We don't care about default symbol or not */
3052 ver = strchr(norm, '@');
3053 if (ver) {
3054 buf = strndup(norm, ver - norm);
3055 if (!buf)
3056 return -ENOMEM;
3057 norm = buf;
3058 }
3059 }
3060
3061 if (strglobmatch(norm, name)) {
3062 found++;
3063 if (syms && found < probe_conf.max_probes)
3064 syms[found - 1] = sym;
3065 }
3066 if (buf)
3067 zfree(&buf);
3068 }
3069
3070 return found;
3071 }
3072
3073 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
3074 struct probe_trace_event *tev __maybe_unused,
3075 struct map *map __maybe_unused,
3076 struct symbol *sym __maybe_unused) { }
3077
3078
3079 static void pr_kallsyms_access_error(void)
3080 {
3081 pr_err("Please ensure you can read the /proc/kallsyms symbol addresses.\n"
3082 "If /proc/sys/kernel/kptr_restrict is '2', you can not read\n"
3083 "kernel symbol addresses even if you are a superuser. Please change\n"
3084 "it to '1'. If kptr_restrict is '1', the superuser can read the\n"
3085 "symbol addresses.\n"
3086 "In that case, please run this command again with sudo.\n");
3087 }
3088
3089 /*
3090 * Find probe function addresses from map.
3091 * Return an error or the number of found probe_trace_event
3092 */
3093 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
3094 struct probe_trace_event **tevs)
3095 {
3096 struct map *map = NULL;
3097 struct ref_reloc_sym *reloc_sym = NULL;
3098 struct symbol *sym;
3099 struct symbol **syms = NULL;
3100 struct probe_trace_event *tev;
3101 struct perf_probe_point *pp = &pev->point;
3102 struct probe_trace_point *tp;
3103 int num_matched_functions;
3104 int ret, i, j, skipped = 0;
3105 char *mod_name;
3106
3107 map = get_target_map(pev->target, pev->nsi, pev->uprobes);
3108 if (!map) {
3109 ret = -EINVAL;
3110 goto out;
3111 }
3112
3113 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
3114 if (!syms) {
3115 ret = -ENOMEM;
3116 goto out;
3117 }
3118
3119 /*
3120 * Load matched symbols: Since the different local symbols may have
3121 * same name but different addresses, this lists all the symbols.
3122 */
3123 num_matched_functions = find_probe_functions(map, pp->function, syms);
3124 if (num_matched_functions <= 0) {
3125 if (num_matched_functions == -EACCES) {
3126 pr_err("Failed to load symbols from %s\n",
3127 pev->target ?: "/proc/kallsyms");
3128 if (pev->target)
3129 pr_err("Please ensure the file is not stripped.\n");
3130 else
3131 pr_kallsyms_access_error();
3132 } else
3133 pr_err("Failed to find symbol %s in %s\n", pp->function,
3134 pev->target ? : "kernel");
3135 ret = -ENOENT;
3136 goto out;
3137 } else if (num_matched_functions > probe_conf.max_probes) {
3138 pr_err("Too many functions matched in %s\n",
3139 pev->target ? : "kernel");
3140 ret = -E2BIG;
3141 goto out;
3142 }
3143
3144 /* Note that the symbols in the kmodule are not relocated */
3145 if (!pev->uprobes && !pev->target &&
3146 (!pp->retprobe || kretprobe_offset_is_supported())) {
3147 reloc_sym = kernel_get_ref_reloc_sym(NULL);
3148 if (!reloc_sym) {
3149 pr_warning("Relocated base symbol is not found! "
3150 "Check /proc/sys/kernel/kptr_restrict\n"
3151 "and /proc/sys/kernel/perf_event_paranoid. "
3152 "Or run as privileged perf user.\n\n");
3153 ret = -EINVAL;
3154 goto out;
3155 }
3156 }
3157
3158 /* Setup result trace-probe-events */
3159 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
3160 if (!*tevs) {
3161 ret = -ENOMEM;
3162 goto out;
3163 }
3164
3165 ret = 0;
3166
3167 for (j = 0; j < num_matched_functions; j++) {
3168 sym = syms[j];
3169
3170 if (sym->type != STT_FUNC)
3171 continue;
3172
3173 /* There can be duplicated symbols in the map */
3174 for (i = 0; i < j; i++)
3175 if (sym->start == syms[i]->start) {
3176 pr_debug("Found duplicated symbol %s @ %" PRIx64 "\n",
3177 sym->name, sym->start);
3178 break;
3179 }
3180 if (i != j)
3181 continue;
3182
3183 tev = (*tevs) + ret;
3184 tp = &tev->point;
3185 if (ret == num_matched_functions) {
3186 pr_warning("Too many symbols are listed. Skip it.\n");
3187 break;
3188 }
3189 ret++;
3190
3191 if (pp->offset > sym->end - sym->start) {
3192 pr_warning("Offset %ld is bigger than the size of %s\n",
3193 pp->offset, sym->name);
3194 ret = -ENOENT;
3195 goto err_out;
3196 }
3197 /* Add one probe point */
3198 tp->address = map__unmap_ip(map, sym->start) + pp->offset;
3199
3200 /* Check the kprobe (not in module) is within .text */
3201 if (!pev->uprobes && !pev->target &&
3202 kprobe_warn_out_range(sym->name, tp->address)) {
3203 tp->symbol = NULL; /* Skip it */
3204 skipped++;
3205 } else if (reloc_sym) {
3206 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
3207 tp->offset = tp->address - reloc_sym->addr;
3208 } else {
3209 tp->symbol = strdup_or_goto(sym->name, nomem_out);
3210 tp->offset = pp->offset;
3211 }
3212 tp->realname = strdup_or_goto(sym->name, nomem_out);
3213
3214 tp->retprobe = pp->retprobe;
3215 if (pev->target) {
3216 if (pev->uprobes) {
3217 tev->point.module = strdup_or_goto(pev->target,
3218 nomem_out);
3219 } else {
3220 mod_name = find_module_name(pev->target);
3221 tev->point.module =
3222 strdup(mod_name ? mod_name : pev->target);
3223 free(mod_name);
3224 if (!tev->point.module)
3225 goto nomem_out;
3226 }
3227 }
3228 tev->uprobes = pev->uprobes;
3229 tev->nargs = pev->nargs;
3230 if (tev->nargs) {
3231 tev->args = zalloc(sizeof(struct probe_trace_arg) *
3232 tev->nargs);
3233 if (tev->args == NULL)
3234 goto nomem_out;
3235 }
3236 for (i = 0; i < tev->nargs; i++) {
3237 if (pev->args[i].name)
3238 tev->args[i].name =
3239 strdup_or_goto(pev->args[i].name,
3240 nomem_out);
3241
3242 tev->args[i].value = strdup_or_goto(pev->args[i].var,
3243 nomem_out);
3244 if (pev->args[i].type)
3245 tev->args[i].type =
3246 strdup_or_goto(pev->args[i].type,
3247 nomem_out);
3248 }
3249 arch__fix_tev_from_maps(pev, tev, map, sym);
3250 }
3251 if (ret == skipped) {
3252 ret = -ENOENT;
3253 goto err_out;
3254 }
3255
3256 out:
3257 map__put(map);
3258 free(syms);
3259 return ret;
3260
3261 nomem_out:
3262 ret = -ENOMEM;
3263 err_out:
3264 clear_probe_trace_events(*tevs, num_matched_functions);
3265 zfree(tevs);
3266 goto out;
3267 }
3268
3269 static int try_to_find_absolute_address(struct perf_probe_event *pev,
3270 struct probe_trace_event **tevs)
3271 {
3272 struct perf_probe_point *pp = &pev->point;
3273 struct probe_trace_event *tev;
3274 struct probe_trace_point *tp;
3275 int i, err;
3276
3277 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3278 return -EINVAL;
3279 if (perf_probe_event_need_dwarf(pev))
3280 return -EINVAL;
3281
3282 /*
3283 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3284 * absolute address.
3285 *
3286 * Only one tev can be generated by this.
3287 */
3288 *tevs = zalloc(sizeof(*tev));
3289 if (!*tevs)
3290 return -ENOMEM;
3291
3292 tev = *tevs;
3293 tp = &tev->point;
3294
3295 /*
3296 * Don't use tp->offset, use address directly, because
3297 * in synthesize_probe_trace_command() address cannot be
3298 * zero.
3299 */
3300 tp->address = pev->point.abs_address;
3301 tp->retprobe = pp->retprobe;
3302 tev->uprobes = pev->uprobes;
3303
3304 err = -ENOMEM;
3305 /*
3306 * Give it a '0x' leading symbol name.
3307 * In __add_probe_trace_events, a NULL symbol is interpreted as
3308 * invalid.
3309 */
3310 if (asprintf(&tp->symbol, "0x%" PRIx64, tp->address) < 0)
3311 goto errout;
3312
3313 /* For kprobe, check range */
3314 if ((!tev->uprobes) &&
3315 (kprobe_warn_out_range(tev->point.symbol,
3316 tev->point.address))) {
3317 err = -EACCES;
3318 goto errout;
3319 }
3320
3321 if (asprintf(&tp->realname, "abs_%" PRIx64, tp->address) < 0)
3322 goto errout;
3323
3324 if (pev->target) {
3325 tp->module = strdup(pev->target);
3326 if (!tp->module)
3327 goto errout;
3328 }
3329
3330 if (tev->group) {
3331 tev->group = strdup(pev->group);
3332 if (!tev->group)
3333 goto errout;
3334 }
3335
3336 if (pev->event) {
3337 tev->event = strdup(pev->event);
3338 if (!tev->event)
3339 goto errout;
3340 }
3341
3342 tev->nargs = pev->nargs;
3343 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3344 if (!tev->args)
3345 goto errout;
3346
3347 for (i = 0; i < tev->nargs; i++)
3348 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3349
3350 return 1;
3351
3352 errout:
3353 clear_probe_trace_events(*tevs, 1);
3354 *tevs = NULL;
3355 return err;
3356 }
3357
3358 /* Concatenate two arrays */
3359 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3360 {
3361 void *ret;
3362
3363 ret = malloc(sz_a + sz_b);
3364 if (ret) {
3365 memcpy(ret, a, sz_a);
3366 memcpy(ret + sz_a, b, sz_b);
3367 }
3368 return ret;
3369 }
3370
3371 static int
3372 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3373 struct probe_trace_event **tevs2, int ntevs2)
3374 {
3375 struct probe_trace_event *new_tevs;
3376 int ret = 0;
3377
3378 if (*ntevs == 0) {
3379 *tevs = *tevs2;
3380 *ntevs = ntevs2;
3381 *tevs2 = NULL;
3382 return 0;
3383 }
3384
3385 if (*ntevs + ntevs2 > probe_conf.max_probes)
3386 ret = -E2BIG;
3387 else {
3388 /* Concatenate the array of probe_trace_event */
3389 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3390 *tevs2, ntevs2 * sizeof(**tevs2));
3391 if (!new_tevs)
3392 ret = -ENOMEM;
3393 else {
3394 free(*tevs);
3395 *tevs = new_tevs;
3396 *ntevs += ntevs2;
3397 }
3398 }
3399 if (ret < 0)
3400 clear_probe_trace_events(*tevs2, ntevs2);
3401 zfree(tevs2);
3402
3403 return ret;
3404 }
3405
3406 /*
3407 * Try to find probe_trace_event from given probe caches. Return the number
3408 * of cached events found, if an error occurs return the error.
3409 */
3410 static int find_cached_events(struct perf_probe_event *pev,
3411 struct probe_trace_event **tevs,
3412 const char *target)
3413 {
3414 struct probe_cache *cache;
3415 struct probe_cache_entry *entry;
3416 struct probe_trace_event *tmp_tevs = NULL;
3417 int ntevs = 0;
3418 int ret = 0;
3419
3420 cache = probe_cache__new(target, pev->nsi);
3421 /* Return 0 ("not found") if the target has no probe cache. */
3422 if (!cache)
3423 return 0;
3424
3425 for_each_probe_cache_entry(entry, cache) {
3426 /* Skip the cache entry which has no name */
3427 if (!entry->pev.event || !entry->pev.group)
3428 continue;
3429 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3430 strglobmatch(entry->pev.event, pev->event)) {
3431 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3432 if (ret > 0)
3433 ret = concat_probe_trace_events(tevs, &ntevs,
3434 &tmp_tevs, ret);
3435 if (ret < 0)
3436 break;
3437 }
3438 }
3439 probe_cache__delete(cache);
3440 if (ret < 0) {
3441 clear_probe_trace_events(*tevs, ntevs);
3442 zfree(tevs);
3443 } else {
3444 ret = ntevs;
3445 if (ntevs > 0 && target && target[0] == '/')
3446 pev->uprobes = true;
3447 }
3448
3449 return ret;
3450 }
3451
3452 /* Try to find probe_trace_event from all probe caches */
3453 static int find_cached_events_all(struct perf_probe_event *pev,
3454 struct probe_trace_event **tevs)
3455 {
3456 struct probe_trace_event *tmp_tevs = NULL;
3457 struct strlist *bidlist;
3458 struct str_node *nd;
3459 char *pathname;
3460 int ntevs = 0;
3461 int ret;
3462
3463 /* Get the buildid list of all valid caches */
3464 bidlist = build_id_cache__list_all(true);
3465 if (!bidlist) {
3466 ret = -errno;
3467 pr_debug("Failed to get buildids: %d\n", ret);
3468 return ret;
3469 }
3470
3471 ret = 0;
3472 strlist__for_each_entry(nd, bidlist) {
3473 pathname = build_id_cache__origname(nd->s);
3474 ret = find_cached_events(pev, &tmp_tevs, pathname);
3475 /* In the case of cnt == 0, we just skip it */
3476 if (ret > 0)
3477 ret = concat_probe_trace_events(tevs, &ntevs,
3478 &tmp_tevs, ret);
3479 free(pathname);
3480 if (ret < 0)
3481 break;
3482 }
3483 strlist__delete(bidlist);
3484
3485 if (ret < 0) {
3486 clear_probe_trace_events(*tevs, ntevs);
3487 zfree(tevs);
3488 } else
3489 ret = ntevs;
3490
3491 return ret;
3492 }
3493
3494 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3495 struct probe_trace_event **tevs)
3496 {
3497 struct probe_cache *cache;
3498 struct probe_cache_entry *entry;
3499 struct probe_trace_event *tev;
3500 struct str_node *node;
3501 int ret, i;
3502
3503 if (pev->sdt) {
3504 /* For SDT/cached events, we use special search functions */
3505 if (!pev->target)
3506 return find_cached_events_all(pev, tevs);
3507 else
3508 return find_cached_events(pev, tevs, pev->target);
3509 }
3510 cache = probe_cache__new(pev->target, pev->nsi);
3511 if (!cache)
3512 return 0;
3513
3514 entry = probe_cache__find(cache, pev);
3515 if (!entry) {
3516 /* SDT must be in the cache */
3517 ret = pev->sdt ? -ENOENT : 0;
3518 goto out;
3519 }
3520
3521 ret = strlist__nr_entries(entry->tevlist);
3522 if (ret > probe_conf.max_probes) {
3523 pr_debug("Too many entries matched in the cache of %s\n",
3524 pev->target ? : "kernel");
3525 ret = -E2BIG;
3526 goto out;
3527 }
3528
3529 *tevs = zalloc(ret * sizeof(*tev));
3530 if (!*tevs) {
3531 ret = -ENOMEM;
3532 goto out;
3533 }
3534
3535 i = 0;
3536 strlist__for_each_entry(node, entry->tevlist) {
3537 tev = &(*tevs)[i++];
3538 ret = parse_probe_trace_command(node->s, tev);
3539 if (ret < 0)
3540 goto out;
3541 /* Set the uprobes attribute as same as original */
3542 tev->uprobes = pev->uprobes;
3543 }
3544 ret = i;
3545
3546 out:
3547 probe_cache__delete(cache);
3548 return ret;
3549 }
3550
3551 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3552 struct probe_trace_event **tevs)
3553 {
3554 int ret;
3555
3556 if (!pev->group && !pev->sdt) {
3557 /* Set group name if not given */
3558 if (!pev->uprobes) {
3559 pev->group = strdup(PERFPROBE_GROUP);
3560 ret = pev->group ? 0 : -ENOMEM;
3561 } else
3562 ret = convert_exec_to_group(pev->target, &pev->group);
3563 if (ret != 0) {
3564 pr_warning("Failed to make a group name.\n");
3565 return ret;
3566 }
3567 }
3568
3569 ret = try_to_find_absolute_address(pev, tevs);
3570 if (ret > 0)
3571 return ret;
3572
3573 /* At first, we need to lookup cache entry */
3574 ret = find_probe_trace_events_from_cache(pev, tevs);
3575 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3576 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3577
3578 /* Convert perf_probe_event with debuginfo */
3579 ret = try_to_find_probe_trace_events(pev, tevs);
3580 if (ret != 0)
3581 return ret; /* Found in debuginfo or got an error */
3582
3583 return find_probe_trace_events_from_map(pev, tevs);
3584 }
3585
3586 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3587 {
3588 int i, ret;
3589
3590 /* Loop 1: convert all events */
3591 for (i = 0; i < npevs; i++) {
3592 /* Init kprobe blacklist if needed */
3593 if (!pevs[i].uprobes)
3594 kprobe_blacklist__init();
3595 /* Convert with or without debuginfo */
3596 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3597 if (ret < 0)
3598 return ret;
3599 pevs[i].ntevs = ret;
3600 }
3601 /* This just release blacklist only if allocated */
3602 kprobe_blacklist__release();
3603
3604 return 0;
3605 }
3606
3607 static int show_probe_trace_event(struct probe_trace_event *tev)
3608 {
3609 char *buf = synthesize_probe_trace_command(tev);
3610
3611 if (!buf) {
3612 pr_debug("Failed to synthesize probe trace event.\n");
3613 return -EINVAL;
3614 }
3615
3616 /* Showing definition always go stdout */
3617 printf("%s\n", buf);
3618 free(buf);
3619
3620 return 0;
3621 }
3622
3623 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3624 {
3625 struct strlist *namelist = strlist__new(NULL, NULL);
3626 struct probe_trace_event *tev;
3627 struct perf_probe_event *pev;
3628 int i, j, ret = 0;
3629
3630 if (!namelist)
3631 return -ENOMEM;
3632
3633 for (j = 0; j < npevs && !ret; j++) {
3634 pev = &pevs[j];
3635 for (i = 0; i < pev->ntevs && !ret; i++) {
3636 tev = &pev->tevs[i];
3637 /* Skip if the symbol is out of .text or blacklisted */
3638 if (!tev->point.symbol && !pev->uprobes)
3639 continue;
3640
3641 /* Set new name for tev (and update namelist) */
3642 ret = probe_trace_event__set_name(tev, pev,
3643 namelist, true);
3644 if (!ret)
3645 ret = show_probe_trace_event(tev);
3646 }
3647 }
3648 strlist__delete(namelist);
3649
3650 return ret;
3651 }
3652
3653 static int show_bootconfig_event(struct probe_trace_event *tev)
3654 {
3655 struct probe_trace_point *tp = &tev->point;
3656 struct strbuf buf;
3657 char *ret = NULL;
3658 int err;
3659
3660 if (strbuf_init(&buf, 32) < 0)
3661 return -ENOMEM;
3662
3663 err = synthesize_kprobe_trace_def(tp, &buf);
3664 if (err >= 0)
3665 err = synthesize_probe_trace_args(tev, &buf);
3666 if (err >= 0)
3667 ret = strbuf_detach(&buf, NULL);
3668 strbuf_release(&buf);
3669
3670 if (ret) {
3671 printf("'%s'", ret);
3672 free(ret);
3673 }
3674
3675 return err;
3676 }
3677
3678 int show_bootconfig_events(struct perf_probe_event *pevs, int npevs)
3679 {
3680 struct strlist *namelist = strlist__new(NULL, NULL);
3681 struct probe_trace_event *tev;
3682 struct perf_probe_event *pev;
3683 char *cur_name = NULL;
3684 int i, j, ret = 0;
3685
3686 if (!namelist)
3687 return -ENOMEM;
3688
3689 for (j = 0; j < npevs && !ret; j++) {
3690 pev = &pevs[j];
3691 if (pev->group && strcmp(pev->group, "probe"))
3692 pr_warning("WARN: Group name %s is ignored\n", pev->group);
3693 if (pev->uprobes) {
3694 pr_warning("ERROR: Bootconfig doesn't support uprobes\n");
3695 ret = -EINVAL;
3696 break;
3697 }
3698 for (i = 0; i < pev->ntevs && !ret; i++) {
3699 tev = &pev->tevs[i];
3700 /* Skip if the symbol is out of .text or blacklisted */
3701 if (!tev->point.symbol && !pev->uprobes)
3702 continue;
3703
3704 /* Set new name for tev (and update namelist) */
3705 ret = probe_trace_event__set_name(tev, pev,
3706 namelist, true);
3707 if (ret)
3708 break;
3709
3710 if (!cur_name || strcmp(cur_name, tev->event)) {
3711 printf("%sftrace.event.kprobes.%s.probe = ",
3712 cur_name ? "\n" : "", tev->event);
3713 cur_name = tev->event;
3714 } else
3715 printf(", ");
3716 ret = show_bootconfig_event(tev);
3717 }
3718 }
3719 printf("\n");
3720 strlist__delete(namelist);
3721
3722 return ret;
3723 }
3724
3725 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3726 {
3727 int i, ret = 0;
3728
3729 /* Loop 2: add all events */
3730 for (i = 0; i < npevs; i++) {
3731 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3732 pevs[i].ntevs,
3733 probe_conf.force_add);
3734 if (ret < 0)
3735 break;
3736 }
3737 return ret;
3738 }
3739
3740 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3741 {
3742 int i, j;
3743 struct perf_probe_event *pev;
3744
3745 /* Loop 3: cleanup and free trace events */
3746 for (i = 0; i < npevs; i++) {
3747 pev = &pevs[i];
3748 for (j = 0; j < pevs[i].ntevs; j++)
3749 clear_probe_trace_event(&pevs[i].tevs[j]);
3750 zfree(&pevs[i].tevs);
3751 pevs[i].ntevs = 0;
3752 nsinfo__zput(pev->nsi);
3753 clear_perf_probe_event(&pevs[i]);
3754 }
3755 }
3756
3757 int show_available_funcs(const char *target, struct nsinfo *nsi,
3758 struct strfilter *_filter, bool user)
3759 {
3760 struct map *map;
3761 struct dso *dso;
3762 int ret;
3763
3764 ret = init_probe_symbol_maps(user);
3765 if (ret < 0)
3766 return ret;
3767
3768 /* Get a symbol map */
3769 map = get_target_map(target, nsi, user);
3770 if (!map) {
3771 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3772 return -EINVAL;
3773 }
3774
3775 ret = map__load(map);
3776 if (ret) {
3777 if (ret == -2) {
3778 char *str = strfilter__string(_filter);
3779 pr_err("Failed to find symbols matched to \"%s\"\n",
3780 str);
3781 free(str);
3782 } else
3783 pr_err("Failed to load symbols in %s\n",
3784 (target) ? : "kernel");
3785 goto end;
3786 }
3787 dso = map__dso(map);
3788 dso__sort_by_name(dso);
3789
3790 /* Show all (filtered) symbols */
3791 setup_pager();
3792
3793 for (size_t i = 0; i < dso__symbol_names_len(dso); i++) {
3794 struct symbol *pos = dso__symbol_names(dso)[i];
3795
3796 if (strfilter__compare(_filter, pos->name))
3797 printf("%s\n", pos->name);
3798 }
3799 end:
3800 map__put(map);
3801 exit_probe_symbol_maps();
3802
3803 return ret;
3804 }
3805
3806 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3807 struct perf_probe_arg *pvar)
3808 {
3809 tvar->value = strdup(pvar->var);
3810 if (tvar->value == NULL)
3811 return -ENOMEM;
3812 if (pvar->type) {
3813 tvar->type = strdup(pvar->type);
3814 if (tvar->type == NULL)
3815 return -ENOMEM;
3816 }
3817 if (pvar->name) {
3818 tvar->name = strdup(pvar->name);
3819 if (tvar->name == NULL)
3820 return -ENOMEM;
3821 } else
3822 tvar->name = NULL;
3823 return 0;
3824 }
Kernel DRM miscellaneous fixes and cross-tree changes