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perf tools: Check recorded kernel version when finding vmlinux
[deliverable/linux.git] / tools / perf / util / probe-event.c
1 /*
2 * probe-event.c : perf-probe definition to probe_events format converter
3 *
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 */
21
22 #include <sys/utsname.h>
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <fcntl.h>
26 #include <errno.h>
27 #include <stdio.h>
28 #include <unistd.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <stdarg.h>
32 #include <limits.h>
33 #include <elf.h>
34
35 #include "util.h"
36 #include "event.h"
37 #include "strlist.h"
38 #include "debug.h"
39 #include "cache.h"
40 #include "color.h"
41 #include "symbol.h"
42 #include "thread.h"
43 #include <api/fs/debugfs.h>
44 #include "trace-event.h" /* For __maybe_unused */
45 #include "probe-event.h"
46 #include "probe-finder.h"
47 #include "session.h"
48
49 #define MAX_CMDLEN 256
50 #define PERFPROBE_GROUP "probe"
51
52 bool probe_event_dry_run; /* Dry run flag */
53
54 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
55
56 /* If there is no space to write, returns -E2BIG. */
57 static int e_snprintf(char *str, size_t size, const char *format, ...)
58 __attribute__((format(printf, 3, 4)));
59
60 static int e_snprintf(char *str, size_t size, const char *format, ...)
61 {
62 int ret;
63 va_list ap;
64 va_start(ap, format);
65 ret = vsnprintf(str, size, format, ap);
66 va_end(ap);
67 if (ret >= (int)size)
68 ret = -E2BIG;
69 return ret;
70 }
71
72 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
73 static void clear_probe_trace_event(struct probe_trace_event *tev);
74 static struct machine *host_machine;
75
76 /* Initialize symbol maps and path of vmlinux/modules */
77 static int init_symbol_maps(bool user_only)
78 {
79 int ret;
80
81 symbol_conf.sort_by_name = true;
82 ret = symbol__init(NULL);
83 if (ret < 0) {
84 pr_debug("Failed to init symbol map.\n");
85 goto out;
86 }
87
88 if (host_machine || user_only) /* already initialized */
89 return 0;
90
91 if (symbol_conf.vmlinux_name)
92 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
93
94 host_machine = machine__new_host();
95 if (!host_machine) {
96 pr_debug("machine__new_host() failed.\n");
97 symbol__exit();
98 ret = -1;
99 }
100 out:
101 if (ret < 0)
102 pr_warning("Failed to init vmlinux path.\n");
103 return ret;
104 }
105
106 static void exit_symbol_maps(void)
107 {
108 if (host_machine) {
109 machine__delete(host_machine);
110 host_machine = NULL;
111 }
112 symbol__exit();
113 }
114
115 static struct symbol *__find_kernel_function_by_name(const char *name,
116 struct map **mapp)
117 {
118 return machine__find_kernel_function_by_name(host_machine, name, mapp,
119 NULL);
120 }
121
122 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
123 {
124 return machine__find_kernel_function(host_machine, addr, mapp, NULL);
125 }
126
127 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
128 {
129 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
130 struct kmap *kmap;
131
132 if (map__load(host_machine->vmlinux_maps[MAP__FUNCTION], NULL) < 0)
133 return NULL;
134
135 kmap = map__kmap(host_machine->vmlinux_maps[MAP__FUNCTION]);
136 return kmap->ref_reloc_sym;
137 }
138
139 static u64 kernel_get_symbol_address_by_name(const char *name, bool reloc)
140 {
141 struct ref_reloc_sym *reloc_sym;
142 struct symbol *sym;
143 struct map *map;
144
145 /* ref_reloc_sym is just a label. Need a special fix*/
146 reloc_sym = kernel_get_ref_reloc_sym();
147 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
148 return (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
149 else {
150 sym = __find_kernel_function_by_name(name, &map);
151 if (sym)
152 return map->unmap_ip(map, sym->start) -
153 (reloc) ? 0 : map->reloc;
154 }
155 return 0;
156 }
157
158 static struct map *kernel_get_module_map(const char *module)
159 {
160 struct rb_node *nd;
161 struct map_groups *grp = &host_machine->kmaps;
162
163 /* A file path -- this is an offline module */
164 if (module && strchr(module, '/'))
165 return machine__new_module(host_machine, 0, module);
166
167 if (!module)
168 module = "kernel";
169
170 for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
171 struct map *pos = rb_entry(nd, struct map, rb_node);
172 if (strncmp(pos->dso->short_name + 1, module,
173 pos->dso->short_name_len - 2) == 0) {
174 return pos;
175 }
176 }
177 return NULL;
178 }
179
180 static struct dso *kernel_get_module_dso(const char *module)
181 {
182 struct dso *dso;
183 struct map *map;
184 const char *vmlinux_name;
185
186 if (module) {
187 list_for_each_entry(dso, &host_machine->kernel_dsos, node) {
188 if (strncmp(dso->short_name + 1, module,
189 dso->short_name_len - 2) == 0)
190 goto found;
191 }
192 pr_debug("Failed to find module %s.\n", module);
193 return NULL;
194 }
195
196 map = host_machine->vmlinux_maps[MAP__FUNCTION];
197 dso = map->dso;
198
199 vmlinux_name = symbol_conf.vmlinux_name;
200 if (vmlinux_name) {
201 if (dso__load_vmlinux(dso, map, vmlinux_name, false, NULL) <= 0)
202 return NULL;
203 } else {
204 if (dso__load_vmlinux_path(dso, map, NULL) <= 0) {
205 pr_debug("Failed to load kernel map.\n");
206 return NULL;
207 }
208 }
209 found:
210 return dso;
211 }
212
213 const char *kernel_get_module_path(const char *module)
214 {
215 struct dso *dso = kernel_get_module_dso(module);
216 return (dso) ? dso->long_name : NULL;
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 ptr2 = strpbrk(ptr1, "-._");
236 if (ptr2)
237 *ptr2 = '\0';
238 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
239 if (ret < 0)
240 goto out;
241
242 *result = strdup(buf);
243 ret = *result ? 0 : -ENOMEM;
244
245 out:
246 free(exec_copy);
247 return ret;
248 }
249
250 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
251 {
252 int i;
253
254 for (i = 0; i < ntevs; i++)
255 clear_probe_trace_event(tevs + i);
256 }
257
258 #ifdef HAVE_DWARF_SUPPORT
259
260 /* Open new debuginfo of given module */
261 static struct debuginfo *open_debuginfo(const char *module)
262 {
263 const char *path = module;
264
265 if (!module || !strchr(module, '/')) {
266 path = kernel_get_module_path(module);
267 if (!path) {
268 pr_err("Failed to find path of %s module.\n",
269 module ?: "kernel");
270 return NULL;
271 }
272 }
273 return debuginfo__new(path);
274 }
275
276 static int get_text_start_address(const char *exec, unsigned long *address)
277 {
278 Elf *elf;
279 GElf_Ehdr ehdr;
280 GElf_Shdr shdr;
281 int fd, ret = -ENOENT;
282
283 fd = open(exec, O_RDONLY);
284 if (fd < 0)
285 return -errno;
286
287 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
288 if (elf == NULL)
289 return -EINVAL;
290
291 if (gelf_getehdr(elf, &ehdr) == NULL)
292 goto out;
293
294 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
295 goto out;
296
297 *address = shdr.sh_addr - shdr.sh_offset;
298 ret = 0;
299 out:
300 elf_end(elf);
301 return ret;
302 }
303
304 /*
305 * Convert trace point to probe point with debuginfo
306 */
307 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
308 struct perf_probe_point *pp,
309 bool is_kprobe)
310 {
311 struct debuginfo *dinfo = NULL;
312 unsigned long stext = 0;
313 u64 addr = tp->address;
314 int ret = -ENOENT;
315
316 /* convert the address to dwarf address */
317 if (!is_kprobe) {
318 if (!addr) {
319 ret = -EINVAL;
320 goto error;
321 }
322 ret = get_text_start_address(tp->module, &stext);
323 if (ret < 0)
324 goto error;
325 addr += stext;
326 } else {
327 addr = kernel_get_symbol_address_by_name(tp->symbol, false);
328 if (addr == 0)
329 goto error;
330 addr += tp->offset;
331 }
332
333 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
334 tp->module ? : "kernel");
335
336 dinfo = open_debuginfo(tp->module);
337 if (dinfo) {
338 ret = debuginfo__find_probe_point(dinfo,
339 (unsigned long)addr, pp);
340 debuginfo__delete(dinfo);
341 } else {
342 pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n", addr);
343 ret = -ENOENT;
344 }
345
346 if (ret > 0) {
347 pp->retprobe = tp->retprobe;
348 return 0;
349 }
350 error:
351 pr_debug("Failed to find corresponding probes from debuginfo.\n");
352 return ret ? : -ENOENT;
353 }
354
355 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
356 int ntevs, const char *exec)
357 {
358 int i, ret = 0;
359 unsigned long stext = 0;
360
361 if (!exec)
362 return 0;
363
364 ret = get_text_start_address(exec, &stext);
365 if (ret < 0)
366 return ret;
367
368 for (i = 0; i < ntevs && ret >= 0; i++) {
369 /* point.address is the addres of point.symbol + point.offset */
370 tevs[i].point.address -= stext;
371 tevs[i].point.module = strdup(exec);
372 if (!tevs[i].point.module) {
373 ret = -ENOMEM;
374 break;
375 }
376 tevs[i].uprobes = true;
377 }
378
379 return ret;
380 }
381
382 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
383 int ntevs, const char *module)
384 {
385 int i, ret = 0;
386 char *tmp;
387
388 if (!module)
389 return 0;
390
391 tmp = strrchr(module, '/');
392 if (tmp) {
393 /* This is a module path -- get the module name */
394 module = strdup(tmp + 1);
395 if (!module)
396 return -ENOMEM;
397 tmp = strchr(module, '.');
398 if (tmp)
399 *tmp = '\0';
400 tmp = (char *)module; /* For free() */
401 }
402
403 for (i = 0; i < ntevs; i++) {
404 tevs[i].point.module = strdup(module);
405 if (!tevs[i].point.module) {
406 ret = -ENOMEM;
407 break;
408 }
409 }
410
411 free(tmp);
412 return ret;
413 }
414
415 /* Post processing the probe events */
416 static int post_process_probe_trace_events(struct probe_trace_event *tevs,
417 int ntevs, const char *module,
418 bool uprobe)
419 {
420 struct ref_reloc_sym *reloc_sym;
421 char *tmp;
422 int i;
423
424 if (uprobe)
425 return add_exec_to_probe_trace_events(tevs, ntevs, module);
426
427 /* Note that currently ref_reloc_sym based probe is not for drivers */
428 if (module)
429 return add_module_to_probe_trace_events(tevs, ntevs, module);
430
431 reloc_sym = kernel_get_ref_reloc_sym();
432 if (!reloc_sym) {
433 pr_warning("Relocated base symbol is not found!\n");
434 return -EINVAL;
435 }
436
437 for (i = 0; i < ntevs; i++) {
438 if (tevs[i].point.address) {
439 tmp = strdup(reloc_sym->name);
440 if (!tmp)
441 return -ENOMEM;
442 free(tevs[i].point.symbol);
443 tevs[i].point.symbol = tmp;
444 tevs[i].point.offset = tevs[i].point.address -
445 reloc_sym->unrelocated_addr;
446 }
447 }
448 return 0;
449 }
450
451 /* Try to find perf_probe_event with debuginfo */
452 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
453 struct probe_trace_event **tevs,
454 int max_tevs, const char *target)
455 {
456 bool need_dwarf = perf_probe_event_need_dwarf(pev);
457 struct debuginfo *dinfo;
458 int ntevs, ret = 0;
459
460 dinfo = open_debuginfo(target);
461
462 if (!dinfo) {
463 if (need_dwarf) {
464 pr_warning("Failed to open debuginfo file.\n");
465 return -ENOENT;
466 }
467 pr_debug("Could not open debuginfo. Try to use symbols.\n");
468 return 0;
469 }
470
471 pr_debug("Try to find probe point from debuginfo.\n");
472 /* Searching trace events corresponding to a probe event */
473 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
474
475 debuginfo__delete(dinfo);
476
477 if (ntevs > 0) { /* Succeeded to find trace events */
478 pr_debug("Found %d probe_trace_events.\n", ntevs);
479 ret = post_process_probe_trace_events(*tevs, ntevs,
480 target, pev->uprobes);
481 if (ret < 0) {
482 clear_probe_trace_events(*tevs, ntevs);
483 zfree(tevs);
484 }
485 return ret < 0 ? ret : ntevs;
486 }
487
488 if (ntevs == 0) { /* No error but failed to find probe point. */
489 pr_warning("Probe point '%s' not found.\n",
490 synthesize_perf_probe_point(&pev->point));
491 return -ENOENT;
492 }
493 /* Error path : ntevs < 0 */
494 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
495 if (ntevs == -EBADF) {
496 pr_warning("Warning: No dwarf info found in the vmlinux - "
497 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
498 if (!need_dwarf) {
499 pr_debug("Trying to use symbols.\n");
500 return 0;
501 }
502 }
503 return ntevs;
504 }
505
506 /*
507 * Find a src file from a DWARF tag path. Prepend optional source path prefix
508 * and chop off leading directories that do not exist. Result is passed back as
509 * a newly allocated path on success.
510 * Return 0 if file was found and readable, -errno otherwise.
511 */
512 static int get_real_path(const char *raw_path, const char *comp_dir,
513 char **new_path)
514 {
515 const char *prefix = symbol_conf.source_prefix;
516
517 if (!prefix) {
518 if (raw_path[0] != '/' && comp_dir)
519 /* If not an absolute path, try to use comp_dir */
520 prefix = comp_dir;
521 else {
522 if (access(raw_path, R_OK) == 0) {
523 *new_path = strdup(raw_path);
524 return 0;
525 } else
526 return -errno;
527 }
528 }
529
530 *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
531 if (!*new_path)
532 return -ENOMEM;
533
534 for (;;) {
535 sprintf(*new_path, "%s/%s", prefix, raw_path);
536
537 if (access(*new_path, R_OK) == 0)
538 return 0;
539
540 if (!symbol_conf.source_prefix)
541 /* In case of searching comp_dir, don't retry */
542 return -errno;
543
544 switch (errno) {
545 case ENAMETOOLONG:
546 case ENOENT:
547 case EROFS:
548 case EFAULT:
549 raw_path = strchr(++raw_path, '/');
550 if (!raw_path) {
551 zfree(new_path);
552 return -ENOENT;
553 }
554 continue;
555
556 default:
557 zfree(new_path);
558 return -errno;
559 }
560 }
561 }
562
563 #define LINEBUF_SIZE 256
564 #define NR_ADDITIONAL_LINES 2
565
566 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
567 {
568 char buf[LINEBUF_SIZE];
569 const char *color = show_num ? "" : PERF_COLOR_BLUE;
570 const char *prefix = NULL;
571
572 do {
573 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
574 goto error;
575 if (skip)
576 continue;
577 if (!prefix) {
578 prefix = show_num ? "%7d " : " ";
579 color_fprintf(stdout, color, prefix, l);
580 }
581 color_fprintf(stdout, color, "%s", buf);
582
583 } while (strchr(buf, '\n') == NULL);
584
585 return 1;
586 error:
587 if (ferror(fp)) {
588 pr_warning("File read error: %s\n", strerror(errno));
589 return -1;
590 }
591 return 0;
592 }
593
594 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
595 {
596 int rv = __show_one_line(fp, l, skip, show_num);
597 if (rv == 0) {
598 pr_warning("Source file is shorter than expected.\n");
599 rv = -1;
600 }
601 return rv;
602 }
603
604 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
605 #define show_one_line(f,l) _show_one_line(f,l,false,false)
606 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
607 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
608
609 /*
610 * Show line-range always requires debuginfo to find source file and
611 * line number.
612 */
613 static int __show_line_range(struct line_range *lr, const char *module)
614 {
615 int l = 1;
616 struct int_node *ln;
617 struct debuginfo *dinfo;
618 FILE *fp;
619 int ret;
620 char *tmp;
621
622 /* Search a line range */
623 dinfo = open_debuginfo(module);
624 if (!dinfo) {
625 pr_warning("Failed to open debuginfo file.\n");
626 return -ENOENT;
627 }
628
629 ret = debuginfo__find_line_range(dinfo, lr);
630 debuginfo__delete(dinfo);
631 if (ret == 0 || ret == -ENOENT) {
632 pr_warning("Specified source line is not found.\n");
633 return -ENOENT;
634 } else if (ret < 0) {
635 pr_warning("Debuginfo analysis failed.\n");
636 return ret;
637 }
638
639 /* Convert source file path */
640 tmp = lr->path;
641 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
642 free(tmp); /* Free old path */
643 if (ret < 0) {
644 pr_warning("Failed to find source file path.\n");
645 return ret;
646 }
647
648 setup_pager();
649
650 if (lr->function)
651 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
652 lr->start - lr->offset);
653 else
654 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
655
656 fp = fopen(lr->path, "r");
657 if (fp == NULL) {
658 pr_warning("Failed to open %s: %s\n", lr->path,
659 strerror(errno));
660 return -errno;
661 }
662 /* Skip to starting line number */
663 while (l < lr->start) {
664 ret = skip_one_line(fp, l++);
665 if (ret < 0)
666 goto end;
667 }
668
669 intlist__for_each(ln, lr->line_list) {
670 for (; ln->i > l; l++) {
671 ret = show_one_line(fp, l - lr->offset);
672 if (ret < 0)
673 goto end;
674 }
675 ret = show_one_line_with_num(fp, l++ - lr->offset);
676 if (ret < 0)
677 goto end;
678 }
679
680 if (lr->end == INT_MAX)
681 lr->end = l + NR_ADDITIONAL_LINES;
682 while (l <= lr->end) {
683 ret = show_one_line_or_eof(fp, l++ - lr->offset);
684 if (ret <= 0)
685 break;
686 }
687 end:
688 fclose(fp);
689 return ret;
690 }
691
692 int show_line_range(struct line_range *lr, const char *module)
693 {
694 int ret;
695
696 ret = init_symbol_maps(false);
697 if (ret < 0)
698 return ret;
699 ret = __show_line_range(lr, module);
700 exit_symbol_maps();
701
702 return ret;
703 }
704
705 static int show_available_vars_at(struct debuginfo *dinfo,
706 struct perf_probe_event *pev,
707 int max_vls, struct strfilter *_filter,
708 bool externs)
709 {
710 char *buf;
711 int ret, i, nvars;
712 struct str_node *node;
713 struct variable_list *vls = NULL, *vl;
714 const char *var;
715
716 buf = synthesize_perf_probe_point(&pev->point);
717 if (!buf)
718 return -EINVAL;
719 pr_debug("Searching variables at %s\n", buf);
720
721 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
722 max_vls, externs);
723 if (ret <= 0) {
724 if (ret == 0 || ret == -ENOENT) {
725 pr_err("Failed to find the address of %s\n", buf);
726 ret = -ENOENT;
727 } else
728 pr_warning("Debuginfo analysis failed.\n");
729 goto end;
730 }
731
732 /* Some variables are found */
733 fprintf(stdout, "Available variables at %s\n", buf);
734 for (i = 0; i < ret; i++) {
735 vl = &vls[i];
736 /*
737 * A probe point might be converted to
738 * several trace points.
739 */
740 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
741 vl->point.offset);
742 zfree(&vl->point.symbol);
743 nvars = 0;
744 if (vl->vars) {
745 strlist__for_each(node, vl->vars) {
746 var = strchr(node->s, '\t') + 1;
747 if (strfilter__compare(_filter, var)) {
748 fprintf(stdout, "\t\t%s\n", node->s);
749 nvars++;
750 }
751 }
752 strlist__delete(vl->vars);
753 }
754 if (nvars == 0)
755 fprintf(stdout, "\t\t(No matched variables)\n");
756 }
757 free(vls);
758 end:
759 free(buf);
760 return ret;
761 }
762
763 /* Show available variables on given probe point */
764 int show_available_vars(struct perf_probe_event *pevs, int npevs,
765 int max_vls, const char *module,
766 struct strfilter *_filter, bool externs)
767 {
768 int i, ret = 0;
769 struct debuginfo *dinfo;
770
771 ret = init_symbol_maps(false);
772 if (ret < 0)
773 return ret;
774
775 dinfo = open_debuginfo(module);
776 if (!dinfo) {
777 pr_warning("Failed to open debuginfo file.\n");
778 ret = -ENOENT;
779 goto out;
780 }
781
782 setup_pager();
783
784 for (i = 0; i < npevs && ret >= 0; i++)
785 ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
786 externs);
787
788 debuginfo__delete(dinfo);
789 out:
790 exit_symbol_maps();
791 return ret;
792 }
793
794 #else /* !HAVE_DWARF_SUPPORT */
795
796 static int
797 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
798 struct perf_probe_point *pp __maybe_unused,
799 bool is_kprobe __maybe_unused)
800 {
801 return -ENOSYS;
802 }
803
804 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
805 struct probe_trace_event **tevs __maybe_unused,
806 int max_tevs __maybe_unused,
807 const char *target __maybe_unused)
808 {
809 if (perf_probe_event_need_dwarf(pev)) {
810 pr_warning("Debuginfo-analysis is not supported.\n");
811 return -ENOSYS;
812 }
813
814 return 0;
815 }
816
817 int show_line_range(struct line_range *lr __maybe_unused,
818 const char *module __maybe_unused)
819 {
820 pr_warning("Debuginfo-analysis is not supported.\n");
821 return -ENOSYS;
822 }
823
824 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
825 int npevs __maybe_unused, int max_vls __maybe_unused,
826 const char *module __maybe_unused,
827 struct strfilter *filter __maybe_unused,
828 bool externs __maybe_unused)
829 {
830 pr_warning("Debuginfo-analysis is not supported.\n");
831 return -ENOSYS;
832 }
833 #endif
834
835 void line_range__clear(struct line_range *lr)
836 {
837 free(lr->function);
838 free(lr->file);
839 free(lr->path);
840 free(lr->comp_dir);
841 intlist__delete(lr->line_list);
842 memset(lr, 0, sizeof(*lr));
843 }
844
845 int line_range__init(struct line_range *lr)
846 {
847 memset(lr, 0, sizeof(*lr));
848 lr->line_list = intlist__new(NULL);
849 if (!lr->line_list)
850 return -ENOMEM;
851 else
852 return 0;
853 }
854
855 static int parse_line_num(char **ptr, int *val, const char *what)
856 {
857 const char *start = *ptr;
858
859 errno = 0;
860 *val = strtol(*ptr, ptr, 0);
861 if (errno || *ptr == start) {
862 semantic_error("'%s' is not a valid number.\n", what);
863 return -EINVAL;
864 }
865 return 0;
866 }
867
868 /*
869 * Stuff 'lr' according to the line range described by 'arg'.
870 * The line range syntax is described by:
871 *
872 * SRC[:SLN[+NUM|-ELN]]
873 * FNC[@SRC][:SLN[+NUM|-ELN]]
874 */
875 int parse_line_range_desc(const char *arg, struct line_range *lr)
876 {
877 char *range, *file, *name = strdup(arg);
878 int err;
879
880 if (!name)
881 return -ENOMEM;
882
883 lr->start = 0;
884 lr->end = INT_MAX;
885
886 range = strchr(name, ':');
887 if (range) {
888 *range++ = '\0';
889
890 err = parse_line_num(&range, &lr->start, "start line");
891 if (err)
892 goto err;
893
894 if (*range == '+' || *range == '-') {
895 const char c = *range++;
896
897 err = parse_line_num(&range, &lr->end, "end line");
898 if (err)
899 goto err;
900
901 if (c == '+') {
902 lr->end += lr->start;
903 /*
904 * Adjust the number of lines here.
905 * If the number of lines == 1, the
906 * the end of line should be equal to
907 * the start of line.
908 */
909 lr->end--;
910 }
911 }
912
913 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
914
915 err = -EINVAL;
916 if (lr->start > lr->end) {
917 semantic_error("Start line must be smaller"
918 " than end line.\n");
919 goto err;
920 }
921 if (*range != '\0') {
922 semantic_error("Tailing with invalid str '%s'.\n", range);
923 goto err;
924 }
925 }
926
927 file = strchr(name, '@');
928 if (file) {
929 *file = '\0';
930 lr->file = strdup(++file);
931 if (lr->file == NULL) {
932 err = -ENOMEM;
933 goto err;
934 }
935 lr->function = name;
936 } else if (strchr(name, '.'))
937 lr->file = name;
938 else
939 lr->function = name;
940
941 return 0;
942 err:
943 free(name);
944 return err;
945 }
946
947 /* Check the name is good for event/group */
948 static bool check_event_name(const char *name)
949 {
950 if (!isalpha(*name) && *name != '_')
951 return false;
952 while (*++name != '\0') {
953 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
954 return false;
955 }
956 return true;
957 }
958
959 /* Parse probepoint definition. */
960 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
961 {
962 struct perf_probe_point *pp = &pev->point;
963 char *ptr, *tmp;
964 char c, nc = 0;
965 /*
966 * <Syntax>
967 * perf probe [EVENT=]SRC[:LN|;PTN]
968 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
969 *
970 * TODO:Group name support
971 */
972
973 ptr = strpbrk(arg, ";=@+%");
974 if (ptr && *ptr == '=') { /* Event name */
975 *ptr = '\0';
976 tmp = ptr + 1;
977 if (strchr(arg, ':')) {
978 semantic_error("Group name is not supported yet.\n");
979 return -ENOTSUP;
980 }
981 if (!check_event_name(arg)) {
982 semantic_error("%s is bad for event name -it must "
983 "follow C symbol-naming rule.\n", arg);
984 return -EINVAL;
985 }
986 pev->event = strdup(arg);
987 if (pev->event == NULL)
988 return -ENOMEM;
989 pev->group = NULL;
990 arg = tmp;
991 }
992
993 ptr = strpbrk(arg, ";:+@%");
994 if (ptr) {
995 nc = *ptr;
996 *ptr++ = '\0';
997 }
998
999 tmp = strdup(arg);
1000 if (tmp == NULL)
1001 return -ENOMEM;
1002
1003 /* Check arg is function or file and copy it */
1004 if (strchr(tmp, '.')) /* File */
1005 pp->file = tmp;
1006 else /* Function */
1007 pp->function = tmp;
1008
1009 /* Parse other options */
1010 while (ptr) {
1011 arg = ptr;
1012 c = nc;
1013 if (c == ';') { /* Lazy pattern must be the last part */
1014 pp->lazy_line = strdup(arg);
1015 if (pp->lazy_line == NULL)
1016 return -ENOMEM;
1017 break;
1018 }
1019 ptr = strpbrk(arg, ";:+@%");
1020 if (ptr) {
1021 nc = *ptr;
1022 *ptr++ = '\0';
1023 }
1024 switch (c) {
1025 case ':': /* Line number */
1026 pp->line = strtoul(arg, &tmp, 0);
1027 if (*tmp != '\0') {
1028 semantic_error("There is non-digit char"
1029 " in line number.\n");
1030 return -EINVAL;
1031 }
1032 break;
1033 case '+': /* Byte offset from a symbol */
1034 pp->offset = strtoul(arg, &tmp, 0);
1035 if (*tmp != '\0') {
1036 semantic_error("There is non-digit character"
1037 " in offset.\n");
1038 return -EINVAL;
1039 }
1040 break;
1041 case '@': /* File name */
1042 if (pp->file) {
1043 semantic_error("SRC@SRC is not allowed.\n");
1044 return -EINVAL;
1045 }
1046 pp->file = strdup(arg);
1047 if (pp->file == NULL)
1048 return -ENOMEM;
1049 break;
1050 case '%': /* Probe places */
1051 if (strcmp(arg, "return") == 0) {
1052 pp->retprobe = 1;
1053 } else { /* Others not supported yet */
1054 semantic_error("%%%s is not supported.\n", arg);
1055 return -ENOTSUP;
1056 }
1057 break;
1058 default: /* Buggy case */
1059 pr_err("This program has a bug at %s:%d.\n",
1060 __FILE__, __LINE__);
1061 return -ENOTSUP;
1062 break;
1063 }
1064 }
1065
1066 /* Exclusion check */
1067 if (pp->lazy_line && pp->line) {
1068 semantic_error("Lazy pattern can't be used with"
1069 " line number.\n");
1070 return -EINVAL;
1071 }
1072
1073 if (pp->lazy_line && pp->offset) {
1074 semantic_error("Lazy pattern can't be used with offset.\n");
1075 return -EINVAL;
1076 }
1077
1078 if (pp->line && pp->offset) {
1079 semantic_error("Offset can't be used with line number.\n");
1080 return -EINVAL;
1081 }
1082
1083 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1084 semantic_error("File always requires line number or "
1085 "lazy pattern.\n");
1086 return -EINVAL;
1087 }
1088
1089 if (pp->offset && !pp->function) {
1090 semantic_error("Offset requires an entry function.\n");
1091 return -EINVAL;
1092 }
1093
1094 if (pp->retprobe && !pp->function) {
1095 semantic_error("Return probe requires an entry function.\n");
1096 return -EINVAL;
1097 }
1098
1099 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1100 semantic_error("Offset/Line/Lazy pattern can't be used with "
1101 "return probe.\n");
1102 return -EINVAL;
1103 }
1104
1105 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1106 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1107 pp->lazy_line);
1108 return 0;
1109 }
1110
1111 /* Parse perf-probe event argument */
1112 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1113 {
1114 char *tmp, *goodname;
1115 struct perf_probe_arg_field **fieldp;
1116
1117 pr_debug("parsing arg: %s into ", str);
1118
1119 tmp = strchr(str, '=');
1120 if (tmp) {
1121 arg->name = strndup(str, tmp - str);
1122 if (arg->name == NULL)
1123 return -ENOMEM;
1124 pr_debug("name:%s ", arg->name);
1125 str = tmp + 1;
1126 }
1127
1128 tmp = strchr(str, ':');
1129 if (tmp) { /* Type setting */
1130 *tmp = '\0';
1131 arg->type = strdup(tmp + 1);
1132 if (arg->type == NULL)
1133 return -ENOMEM;
1134 pr_debug("type:%s ", arg->type);
1135 }
1136
1137 tmp = strpbrk(str, "-.[");
1138 if (!is_c_varname(str) || !tmp) {
1139 /* A variable, register, symbol or special value */
1140 arg->var = strdup(str);
1141 if (arg->var == NULL)
1142 return -ENOMEM;
1143 pr_debug("%s\n", arg->var);
1144 return 0;
1145 }
1146
1147 /* Structure fields or array element */
1148 arg->var = strndup(str, tmp - str);
1149 if (arg->var == NULL)
1150 return -ENOMEM;
1151 goodname = arg->var;
1152 pr_debug("%s, ", arg->var);
1153 fieldp = &arg->field;
1154
1155 do {
1156 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1157 if (*fieldp == NULL)
1158 return -ENOMEM;
1159 if (*tmp == '[') { /* Array */
1160 str = tmp;
1161 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1162 (*fieldp)->ref = true;
1163 if (*tmp != ']' || tmp == str + 1) {
1164 semantic_error("Array index must be a"
1165 " number.\n");
1166 return -EINVAL;
1167 }
1168 tmp++;
1169 if (*tmp == '\0')
1170 tmp = NULL;
1171 } else { /* Structure */
1172 if (*tmp == '.') {
1173 str = tmp + 1;
1174 (*fieldp)->ref = false;
1175 } else if (tmp[1] == '>') {
1176 str = tmp + 2;
1177 (*fieldp)->ref = true;
1178 } else {
1179 semantic_error("Argument parse error: %s\n",
1180 str);
1181 return -EINVAL;
1182 }
1183 tmp = strpbrk(str, "-.[");
1184 }
1185 if (tmp) {
1186 (*fieldp)->name = strndup(str, tmp - str);
1187 if ((*fieldp)->name == NULL)
1188 return -ENOMEM;
1189 if (*str != '[')
1190 goodname = (*fieldp)->name;
1191 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1192 fieldp = &(*fieldp)->next;
1193 }
1194 } while (tmp);
1195 (*fieldp)->name = strdup(str);
1196 if ((*fieldp)->name == NULL)
1197 return -ENOMEM;
1198 if (*str != '[')
1199 goodname = (*fieldp)->name;
1200 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1201
1202 /* If no name is specified, set the last field name (not array index)*/
1203 if (!arg->name) {
1204 arg->name = strdup(goodname);
1205 if (arg->name == NULL)
1206 return -ENOMEM;
1207 }
1208 return 0;
1209 }
1210
1211 /* Parse perf-probe event command */
1212 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1213 {
1214 char **argv;
1215 int argc, i, ret = 0;
1216
1217 argv = argv_split(cmd, &argc);
1218 if (!argv) {
1219 pr_debug("Failed to split arguments.\n");
1220 return -ENOMEM;
1221 }
1222 if (argc - 1 > MAX_PROBE_ARGS) {
1223 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1224 ret = -ERANGE;
1225 goto out;
1226 }
1227 /* Parse probe point */
1228 ret = parse_perf_probe_point(argv[0], pev);
1229 if (ret < 0)
1230 goto out;
1231
1232 /* Copy arguments and ensure return probe has no C argument */
1233 pev->nargs = argc - 1;
1234 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1235 if (pev->args == NULL) {
1236 ret = -ENOMEM;
1237 goto out;
1238 }
1239 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1240 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1241 if (ret >= 0 &&
1242 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1243 semantic_error("You can't specify local variable for"
1244 " kretprobe.\n");
1245 ret = -EINVAL;
1246 }
1247 }
1248 out:
1249 argv_free(argv);
1250
1251 return ret;
1252 }
1253
1254 /* Return true if this perf_probe_event requires debuginfo */
1255 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1256 {
1257 int i;
1258
1259 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1260 return true;
1261
1262 for (i = 0; i < pev->nargs; i++)
1263 if (is_c_varname(pev->args[i].var))
1264 return true;
1265
1266 return false;
1267 }
1268
1269 /* Parse probe_events event into struct probe_point */
1270 static int parse_probe_trace_command(const char *cmd,
1271 struct probe_trace_event *tev)
1272 {
1273 struct probe_trace_point *tp = &tev->point;
1274 char pr;
1275 char *p;
1276 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1277 int ret, i, argc;
1278 char **argv;
1279
1280 pr_debug("Parsing probe_events: %s\n", cmd);
1281 argv = argv_split(cmd, &argc);
1282 if (!argv) {
1283 pr_debug("Failed to split arguments.\n");
1284 return -ENOMEM;
1285 }
1286 if (argc < 2) {
1287 semantic_error("Too few probe arguments.\n");
1288 ret = -ERANGE;
1289 goto out;
1290 }
1291
1292 /* Scan event and group name. */
1293 argv0_str = strdup(argv[0]);
1294 if (argv0_str == NULL) {
1295 ret = -ENOMEM;
1296 goto out;
1297 }
1298 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1299 fmt2_str = strtok_r(NULL, "/", &fmt);
1300 fmt3_str = strtok_r(NULL, " \t", &fmt);
1301 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1302 || fmt3_str == NULL) {
1303 semantic_error("Failed to parse event name: %s\n", argv[0]);
1304 ret = -EINVAL;
1305 goto out;
1306 }
1307 pr = fmt1_str[0];
1308 tev->group = strdup(fmt2_str);
1309 tev->event = strdup(fmt3_str);
1310 if (tev->group == NULL || tev->event == NULL) {
1311 ret = -ENOMEM;
1312 goto out;
1313 }
1314 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1315
1316 tp->retprobe = (pr == 'r');
1317
1318 /* Scan module name(if there), function name and offset */
1319 p = strchr(argv[1], ':');
1320 if (p) {
1321 tp->module = strndup(argv[1], p - argv[1]);
1322 p++;
1323 } else
1324 p = argv[1];
1325 fmt1_str = strtok_r(p, "+", &fmt);
1326 if (fmt1_str[0] == '0') /* only the address started with 0x */
1327 tp->address = strtoul(fmt1_str, NULL, 0);
1328 else {
1329 /* Only the symbol-based probe has offset */
1330 tp->symbol = strdup(fmt1_str);
1331 if (tp->symbol == NULL) {
1332 ret = -ENOMEM;
1333 goto out;
1334 }
1335 fmt2_str = strtok_r(NULL, "", &fmt);
1336 if (fmt2_str == NULL)
1337 tp->offset = 0;
1338 else
1339 tp->offset = strtoul(fmt2_str, NULL, 10);
1340 }
1341
1342 tev->nargs = argc - 2;
1343 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1344 if (tev->args == NULL) {
1345 ret = -ENOMEM;
1346 goto out;
1347 }
1348 for (i = 0; i < tev->nargs; i++) {
1349 p = strchr(argv[i + 2], '=');
1350 if (p) /* We don't need which register is assigned. */
1351 *p++ = '\0';
1352 else
1353 p = argv[i + 2];
1354 tev->args[i].name = strdup(argv[i + 2]);
1355 /* TODO: parse regs and offset */
1356 tev->args[i].value = strdup(p);
1357 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1358 ret = -ENOMEM;
1359 goto out;
1360 }
1361 }
1362 ret = 0;
1363 out:
1364 free(argv0_str);
1365 argv_free(argv);
1366 return ret;
1367 }
1368
1369 /* Compose only probe arg */
1370 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
1371 {
1372 struct perf_probe_arg_field *field = pa->field;
1373 int ret;
1374 char *tmp = buf;
1375
1376 if (pa->name && pa->var)
1377 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
1378 else
1379 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
1380 if (ret <= 0)
1381 goto error;
1382 tmp += ret;
1383 len -= ret;
1384
1385 while (field) {
1386 if (field->name[0] == '[')
1387 ret = e_snprintf(tmp, len, "%s", field->name);
1388 else
1389 ret = e_snprintf(tmp, len, "%s%s",
1390 field->ref ? "->" : ".", field->name);
1391 if (ret <= 0)
1392 goto error;
1393 tmp += ret;
1394 len -= ret;
1395 field = field->next;
1396 }
1397
1398 if (pa->type) {
1399 ret = e_snprintf(tmp, len, ":%s", pa->type);
1400 if (ret <= 0)
1401 goto error;
1402 tmp += ret;
1403 len -= ret;
1404 }
1405
1406 return tmp - buf;
1407 error:
1408 pr_debug("Failed to synthesize perf probe argument: %s\n",
1409 strerror(-ret));
1410 return ret;
1411 }
1412
1413 /* Compose only probe point (not argument) */
1414 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1415 {
1416 char *buf, *tmp;
1417 char offs[32] = "", line[32] = "", file[32] = "";
1418 int ret, len;
1419
1420 buf = zalloc(MAX_CMDLEN);
1421 if (buf == NULL) {
1422 ret = -ENOMEM;
1423 goto error;
1424 }
1425 if (pp->offset) {
1426 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
1427 if (ret <= 0)
1428 goto error;
1429 }
1430 if (pp->line) {
1431 ret = e_snprintf(line, 32, ":%d", pp->line);
1432 if (ret <= 0)
1433 goto error;
1434 }
1435 if (pp->file) {
1436 tmp = pp->file;
1437 len = strlen(tmp);
1438 if (len > 30) {
1439 tmp = strchr(pp->file + len - 30, '/');
1440 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1441 }
1442 ret = e_snprintf(file, 32, "@%s", tmp);
1443 if (ret <= 0)
1444 goto error;
1445 }
1446
1447 if (pp->function)
1448 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
1449 offs, pp->retprobe ? "%return" : "", line,
1450 file);
1451 else
1452 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
1453 if (ret <= 0)
1454 goto error;
1455
1456 return buf;
1457 error:
1458 pr_debug("Failed to synthesize perf probe point: %s\n",
1459 strerror(-ret));
1460 free(buf);
1461 return NULL;
1462 }
1463
1464 #if 0
1465 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1466 {
1467 char *buf;
1468 int i, len, ret;
1469
1470 buf = synthesize_perf_probe_point(&pev->point);
1471 if (!buf)
1472 return NULL;
1473
1474 len = strlen(buf);
1475 for (i = 0; i < pev->nargs; i++) {
1476 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
1477 pev->args[i].name);
1478 if (ret <= 0) {
1479 free(buf);
1480 return NULL;
1481 }
1482 len += ret;
1483 }
1484
1485 return buf;
1486 }
1487 #endif
1488
1489 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1490 char **buf, size_t *buflen,
1491 int depth)
1492 {
1493 int ret;
1494 if (ref->next) {
1495 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1496 buflen, depth + 1);
1497 if (depth < 0)
1498 goto out;
1499 }
1500
1501 ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
1502 if (ret < 0)
1503 depth = ret;
1504 else {
1505 *buf += ret;
1506 *buflen -= ret;
1507 }
1508 out:
1509 return depth;
1510
1511 }
1512
1513 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1514 char *buf, size_t buflen)
1515 {
1516 struct probe_trace_arg_ref *ref = arg->ref;
1517 int ret, depth = 0;
1518 char *tmp = buf;
1519
1520 /* Argument name or separator */
1521 if (arg->name)
1522 ret = e_snprintf(buf, buflen, " %s=", arg->name);
1523 else
1524 ret = e_snprintf(buf, buflen, " ");
1525 if (ret < 0)
1526 return ret;
1527 buf += ret;
1528 buflen -= ret;
1529
1530 /* Special case: @XXX */
1531 if (arg->value[0] == '@' && arg->ref)
1532 ref = ref->next;
1533
1534 /* Dereferencing arguments */
1535 if (ref) {
1536 depth = __synthesize_probe_trace_arg_ref(ref, &buf,
1537 &buflen, 1);
1538 if (depth < 0)
1539 return depth;
1540 }
1541
1542 /* Print argument value */
1543 if (arg->value[0] == '@' && arg->ref)
1544 ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
1545 arg->ref->offset);
1546 else
1547 ret = e_snprintf(buf, buflen, "%s", arg->value);
1548 if (ret < 0)
1549 return ret;
1550 buf += ret;
1551 buflen -= ret;
1552
1553 /* Closing */
1554 while (depth--) {
1555 ret = e_snprintf(buf, buflen, ")");
1556 if (ret < 0)
1557 return ret;
1558 buf += ret;
1559 buflen -= ret;
1560 }
1561 /* Print argument type */
1562 if (arg->type) {
1563 ret = e_snprintf(buf, buflen, ":%s", arg->type);
1564 if (ret <= 0)
1565 return ret;
1566 buf += ret;
1567 }
1568
1569 return buf - tmp;
1570 }
1571
1572 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1573 {
1574 struct probe_trace_point *tp = &tev->point;
1575 char *buf;
1576 int i, len, ret;
1577
1578 buf = zalloc(MAX_CMDLEN);
1579 if (buf == NULL)
1580 return NULL;
1581
1582 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
1583 tev->group, tev->event);
1584 if (len <= 0)
1585 goto error;
1586
1587 /* Uprobes must have tp->address and tp->module */
1588 if (tev->uprobes && (!tp->address || !tp->module))
1589 goto error;
1590
1591 /* Use the tp->address for uprobes */
1592 if (tev->uprobes)
1593 ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s:0x%lx",
1594 tp->module, tp->address);
1595 else
1596 ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s%s+%lu",
1597 tp->module ?: "", tp->module ? ":" : "",
1598 tp->symbol, tp->offset);
1599
1600 if (ret <= 0)
1601 goto error;
1602 len += ret;
1603
1604 for (i = 0; i < tev->nargs; i++) {
1605 ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
1606 MAX_CMDLEN - len);
1607 if (ret <= 0)
1608 goto error;
1609 len += ret;
1610 }
1611
1612 return buf;
1613 error:
1614 free(buf);
1615 return NULL;
1616 }
1617
1618 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
1619 struct perf_probe_point *pp,
1620 bool is_kprobe)
1621 {
1622 struct symbol *sym = NULL;
1623 struct map *map;
1624 u64 addr;
1625 int ret = -ENOENT;
1626
1627 if (!is_kprobe) {
1628 map = dso__new_map(tp->module);
1629 if (!map)
1630 goto out;
1631 addr = tp->address;
1632 sym = map__find_symbol(map, addr, NULL);
1633 } else {
1634 addr = kernel_get_symbol_address_by_name(tp->symbol, true);
1635 if (addr) {
1636 addr += tp->offset;
1637 sym = __find_kernel_function(addr, &map);
1638 }
1639 }
1640 if (!sym)
1641 goto out;
1642
1643 pp->retprobe = tp->retprobe;
1644 pp->offset = addr - map->unmap_ip(map, sym->start);
1645 pp->function = strdup(sym->name);
1646 ret = pp->function ? 0 : -ENOMEM;
1647
1648 out:
1649 if (map && !is_kprobe) {
1650 dso__delete(map->dso);
1651 map__delete(map);
1652 }
1653
1654 return ret;
1655 }
1656
1657 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1658 struct perf_probe_point *pp,
1659 bool is_kprobe)
1660 {
1661 char buf[128];
1662 int ret;
1663
1664 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
1665 if (!ret)
1666 return 0;
1667 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
1668 if (!ret)
1669 return 0;
1670
1671 pr_debug("Failed to find probe point from both of dwarf and map.\n");
1672
1673 if (tp->symbol) {
1674 pp->function = strdup(tp->symbol);
1675 pp->offset = tp->offset;
1676 } else if (!tp->module && !is_kprobe) {
1677 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
1678 if (ret < 0)
1679 return ret;
1680 pp->function = strdup(buf);
1681 pp->offset = 0;
1682 }
1683 if (pp->function == NULL)
1684 return -ENOMEM;
1685
1686 pp->retprobe = tp->retprobe;
1687
1688 return 0;
1689 }
1690
1691 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1692 struct perf_probe_event *pev, bool is_kprobe)
1693 {
1694 char buf[64] = "";
1695 int i, ret;
1696
1697 /* Convert event/group name */
1698 pev->event = strdup(tev->event);
1699 pev->group = strdup(tev->group);
1700 if (pev->event == NULL || pev->group == NULL)
1701 return -ENOMEM;
1702
1703 /* Convert trace_point to probe_point */
1704 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
1705 if (ret < 0)
1706 return ret;
1707
1708 /* Convert trace_arg to probe_arg */
1709 pev->nargs = tev->nargs;
1710 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1711 if (pev->args == NULL)
1712 return -ENOMEM;
1713 for (i = 0; i < tev->nargs && ret >= 0; i++) {
1714 if (tev->args[i].name)
1715 pev->args[i].name = strdup(tev->args[i].name);
1716 else {
1717 ret = synthesize_probe_trace_arg(&tev->args[i],
1718 buf, 64);
1719 pev->args[i].name = strdup(buf);
1720 }
1721 if (pev->args[i].name == NULL && ret >= 0)
1722 ret = -ENOMEM;
1723 }
1724
1725 if (ret < 0)
1726 clear_perf_probe_event(pev);
1727
1728 return ret;
1729 }
1730
1731 void clear_perf_probe_event(struct perf_probe_event *pev)
1732 {
1733 struct perf_probe_point *pp = &pev->point;
1734 struct perf_probe_arg_field *field, *next;
1735 int i;
1736
1737 free(pev->event);
1738 free(pev->group);
1739 free(pp->file);
1740 free(pp->function);
1741 free(pp->lazy_line);
1742
1743 for (i = 0; i < pev->nargs; i++) {
1744 free(pev->args[i].name);
1745 free(pev->args[i].var);
1746 free(pev->args[i].type);
1747 field = pev->args[i].field;
1748 while (field) {
1749 next = field->next;
1750 zfree(&field->name);
1751 free(field);
1752 field = next;
1753 }
1754 }
1755 free(pev->args);
1756 memset(pev, 0, sizeof(*pev));
1757 }
1758
1759 static void clear_probe_trace_event(struct probe_trace_event *tev)
1760 {
1761 struct probe_trace_arg_ref *ref, *next;
1762 int i;
1763
1764 free(tev->event);
1765 free(tev->group);
1766 free(tev->point.symbol);
1767 free(tev->point.module);
1768 for (i = 0; i < tev->nargs; i++) {
1769 free(tev->args[i].name);
1770 free(tev->args[i].value);
1771 free(tev->args[i].type);
1772 ref = tev->args[i].ref;
1773 while (ref) {
1774 next = ref->next;
1775 free(ref);
1776 ref = next;
1777 }
1778 }
1779 free(tev->args);
1780 memset(tev, 0, sizeof(*tev));
1781 }
1782
1783 static void print_open_warning(int err, bool is_kprobe)
1784 {
1785 char sbuf[128];
1786
1787 if (err == -ENOENT) {
1788 const char *config;
1789
1790 if (!is_kprobe)
1791 config = "CONFIG_UPROBE_EVENTS";
1792 else
1793 config = "CONFIG_KPROBE_EVENTS";
1794
1795 pr_warning("%cprobe_events file does not exist"
1796 " - please rebuild kernel with %s.\n",
1797 is_kprobe ? 'k' : 'u', config);
1798 } else if (err == -ENOTSUP)
1799 pr_warning("Debugfs is not mounted.\n");
1800 else
1801 pr_warning("Failed to open %cprobe_events: %s\n",
1802 is_kprobe ? 'k' : 'u',
1803 strerror_r(-err, sbuf, sizeof(sbuf)));
1804 }
1805
1806 static void print_both_open_warning(int kerr, int uerr)
1807 {
1808 /* Both kprobes and uprobes are disabled, warn it. */
1809 if (kerr == -ENOTSUP && uerr == -ENOTSUP)
1810 pr_warning("Debugfs is not mounted.\n");
1811 else if (kerr == -ENOENT && uerr == -ENOENT)
1812 pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS "
1813 "or/and CONFIG_UPROBE_EVENTS.\n");
1814 else {
1815 char sbuf[128];
1816 pr_warning("Failed to open kprobe events: %s.\n",
1817 strerror_r(-kerr, sbuf, sizeof(sbuf)));
1818 pr_warning("Failed to open uprobe events: %s.\n",
1819 strerror_r(-uerr, sbuf, sizeof(sbuf)));
1820 }
1821 }
1822
1823 static int open_probe_events(const char *trace_file, bool readwrite)
1824 {
1825 char buf[PATH_MAX];
1826 const char *__debugfs;
1827 int ret;
1828
1829 __debugfs = debugfs_find_mountpoint();
1830 if (__debugfs == NULL)
1831 return -ENOTSUP;
1832
1833 ret = e_snprintf(buf, PATH_MAX, "%s/%s", __debugfs, trace_file);
1834 if (ret >= 0) {
1835 pr_debug("Opening %s write=%d\n", buf, readwrite);
1836 if (readwrite && !probe_event_dry_run)
1837 ret = open(buf, O_RDWR, O_APPEND);
1838 else
1839 ret = open(buf, O_RDONLY, 0);
1840
1841 if (ret < 0)
1842 ret = -errno;
1843 }
1844 return ret;
1845 }
1846
1847 static int open_kprobe_events(bool readwrite)
1848 {
1849 return open_probe_events("tracing/kprobe_events", readwrite);
1850 }
1851
1852 static int open_uprobe_events(bool readwrite)
1853 {
1854 return open_probe_events("tracing/uprobe_events", readwrite);
1855 }
1856
1857 /* Get raw string list of current kprobe_events or uprobe_events */
1858 static struct strlist *get_probe_trace_command_rawlist(int fd)
1859 {
1860 int ret, idx;
1861 FILE *fp;
1862 char buf[MAX_CMDLEN];
1863 char *p;
1864 struct strlist *sl;
1865
1866 sl = strlist__new(true, NULL);
1867
1868 fp = fdopen(dup(fd), "r");
1869 while (!feof(fp)) {
1870 p = fgets(buf, MAX_CMDLEN, fp);
1871 if (!p)
1872 break;
1873
1874 idx = strlen(p) - 1;
1875 if (p[idx] == '\n')
1876 p[idx] = '\0';
1877 ret = strlist__add(sl, buf);
1878 if (ret < 0) {
1879 pr_debug("strlist__add failed: %s\n", strerror(-ret));
1880 strlist__delete(sl);
1881 return NULL;
1882 }
1883 }
1884 fclose(fp);
1885
1886 return sl;
1887 }
1888
1889 /* Show an event */
1890 static int show_perf_probe_event(struct perf_probe_event *pev,
1891 const char *module)
1892 {
1893 int i, ret;
1894 char buf[128];
1895 char *place;
1896
1897 /* Synthesize only event probe point */
1898 place = synthesize_perf_probe_point(&pev->point);
1899 if (!place)
1900 return -EINVAL;
1901
1902 ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1903 if (ret < 0)
1904 return ret;
1905
1906 printf(" %-20s (on %s", buf, place);
1907 if (module)
1908 printf(" in %s", module);
1909
1910 if (pev->nargs > 0) {
1911 printf(" with");
1912 for (i = 0; i < pev->nargs; i++) {
1913 ret = synthesize_perf_probe_arg(&pev->args[i],
1914 buf, 128);
1915 if (ret < 0)
1916 break;
1917 printf(" %s", buf);
1918 }
1919 }
1920 printf(")\n");
1921 free(place);
1922 return ret;
1923 }
1924
1925 static int __show_perf_probe_events(int fd, bool is_kprobe)
1926 {
1927 int ret = 0;
1928 struct probe_trace_event tev;
1929 struct perf_probe_event pev;
1930 struct strlist *rawlist;
1931 struct str_node *ent;
1932
1933 memset(&tev, 0, sizeof(tev));
1934 memset(&pev, 0, sizeof(pev));
1935
1936 rawlist = get_probe_trace_command_rawlist(fd);
1937 if (!rawlist)
1938 return -ENOENT;
1939
1940 strlist__for_each(ent, rawlist) {
1941 ret = parse_probe_trace_command(ent->s, &tev);
1942 if (ret >= 0) {
1943 ret = convert_to_perf_probe_event(&tev, &pev,
1944 is_kprobe);
1945 if (ret >= 0)
1946 ret = show_perf_probe_event(&pev,
1947 tev.point.module);
1948 }
1949 clear_perf_probe_event(&pev);
1950 clear_probe_trace_event(&tev);
1951 if (ret < 0)
1952 break;
1953 }
1954 strlist__delete(rawlist);
1955
1956 return ret;
1957 }
1958
1959 /* List up current perf-probe events */
1960 int show_perf_probe_events(void)
1961 {
1962 int kp_fd, up_fd, ret;
1963
1964 setup_pager();
1965
1966 ret = init_symbol_maps(false);
1967 if (ret < 0)
1968 return ret;
1969
1970 kp_fd = open_kprobe_events(false);
1971 if (kp_fd >= 0) {
1972 ret = __show_perf_probe_events(kp_fd, true);
1973 close(kp_fd);
1974 if (ret < 0)
1975 goto out;
1976 }
1977
1978 up_fd = open_uprobe_events(false);
1979 if (kp_fd < 0 && up_fd < 0) {
1980 print_both_open_warning(kp_fd, up_fd);
1981 ret = kp_fd;
1982 goto out;
1983 }
1984
1985 if (up_fd >= 0) {
1986 ret = __show_perf_probe_events(up_fd, false);
1987 close(up_fd);
1988 }
1989 out:
1990 exit_symbol_maps();
1991 return ret;
1992 }
1993
1994 /* Get current perf-probe event names */
1995 static struct strlist *get_probe_trace_event_names(int fd, bool include_group)
1996 {
1997 char buf[128];
1998 struct strlist *sl, *rawlist;
1999 struct str_node *ent;
2000 struct probe_trace_event tev;
2001 int ret = 0;
2002
2003 memset(&tev, 0, sizeof(tev));
2004 rawlist = get_probe_trace_command_rawlist(fd);
2005 sl = strlist__new(true, NULL);
2006 strlist__for_each(ent, rawlist) {
2007 ret = parse_probe_trace_command(ent->s, &tev);
2008 if (ret < 0)
2009 break;
2010 if (include_group) {
2011 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
2012 tev.event);
2013 if (ret >= 0)
2014 ret = strlist__add(sl, buf);
2015 } else
2016 ret = strlist__add(sl, tev.event);
2017 clear_probe_trace_event(&tev);
2018 if (ret < 0)
2019 break;
2020 }
2021 strlist__delete(rawlist);
2022
2023 if (ret < 0) {
2024 strlist__delete(sl);
2025 return NULL;
2026 }
2027 return sl;
2028 }
2029
2030 static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
2031 {
2032 int ret = 0;
2033 char *buf = synthesize_probe_trace_command(tev);
2034
2035 if (!buf) {
2036 pr_debug("Failed to synthesize probe trace event.\n");
2037 return -EINVAL;
2038 }
2039
2040 pr_debug("Writing event: %s\n", buf);
2041 if (!probe_event_dry_run) {
2042 ret = write(fd, buf, strlen(buf));
2043 if (ret <= 0)
2044 pr_warning("Failed to write event: %s\n",
2045 strerror(errno));
2046 }
2047 free(buf);
2048 return ret;
2049 }
2050
2051 static int get_new_event_name(char *buf, size_t len, const char *base,
2052 struct strlist *namelist, bool allow_suffix)
2053 {
2054 int i, ret;
2055
2056 /* Try no suffix */
2057 ret = e_snprintf(buf, len, "%s", base);
2058 if (ret < 0) {
2059 pr_debug("snprintf() failed: %s\n", strerror(-ret));
2060 return ret;
2061 }
2062 if (!strlist__has_entry(namelist, buf))
2063 return 0;
2064
2065 if (!allow_suffix) {
2066 pr_warning("Error: event \"%s\" already exists. "
2067 "(Use -f to force duplicates.)\n", base);
2068 return -EEXIST;
2069 }
2070
2071 /* Try to add suffix */
2072 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2073 ret = e_snprintf(buf, len, "%s_%d", base, i);
2074 if (ret < 0) {
2075 pr_debug("snprintf() failed: %s\n", strerror(-ret));
2076 return ret;
2077 }
2078 if (!strlist__has_entry(namelist, buf))
2079 break;
2080 }
2081 if (i == MAX_EVENT_INDEX) {
2082 pr_warning("Too many events are on the same function.\n");
2083 ret = -ERANGE;
2084 }
2085
2086 return ret;
2087 }
2088
2089 static int __add_probe_trace_events(struct perf_probe_event *pev,
2090 struct probe_trace_event *tevs,
2091 int ntevs, bool allow_suffix)
2092 {
2093 int i, fd, ret;
2094 struct probe_trace_event *tev = NULL;
2095 char buf[64];
2096 const char *event, *group;
2097 struct strlist *namelist;
2098
2099 if (pev->uprobes)
2100 fd = open_uprobe_events(true);
2101 else
2102 fd = open_kprobe_events(true);
2103
2104 if (fd < 0) {
2105 print_open_warning(fd, !pev->uprobes);
2106 return fd;
2107 }
2108
2109 /* Get current event names */
2110 namelist = get_probe_trace_event_names(fd, false);
2111 if (!namelist) {
2112 pr_debug("Failed to get current event list.\n");
2113 return -EIO;
2114 }
2115
2116 ret = 0;
2117 printf("Added new event%s\n", (ntevs > 1) ? "s:" : ":");
2118 for (i = 0; i < ntevs; i++) {
2119 tev = &tevs[i];
2120 if (pev->event)
2121 event = pev->event;
2122 else
2123 if (pev->point.function)
2124 event = pev->point.function;
2125 else
2126 event = tev->point.symbol;
2127 if (pev->group)
2128 group = pev->group;
2129 else
2130 group = PERFPROBE_GROUP;
2131
2132 /* Get an unused new event name */
2133 ret = get_new_event_name(buf, 64, event,
2134 namelist, allow_suffix);
2135 if (ret < 0)
2136 break;
2137 event = buf;
2138
2139 tev->event = strdup(event);
2140 tev->group = strdup(group);
2141 if (tev->event == NULL || tev->group == NULL) {
2142 ret = -ENOMEM;
2143 break;
2144 }
2145 ret = write_probe_trace_event(fd, tev);
2146 if (ret < 0)
2147 break;
2148 /* Add added event name to namelist */
2149 strlist__add(namelist, event);
2150
2151 /* Trick here - save current event/group */
2152 event = pev->event;
2153 group = pev->group;
2154 pev->event = tev->event;
2155 pev->group = tev->group;
2156 show_perf_probe_event(pev, tev->point.module);
2157 /* Trick here - restore current event/group */
2158 pev->event = (char *)event;
2159 pev->group = (char *)group;
2160
2161 /*
2162 * Probes after the first probe which comes from same
2163 * user input are always allowed to add suffix, because
2164 * there might be several addresses corresponding to
2165 * one code line.
2166 */
2167 allow_suffix = true;
2168 }
2169
2170 if (ret >= 0) {
2171 /* Show how to use the event. */
2172 printf("\nYou can now use it in all perf tools, such as:\n\n");
2173 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
2174 tev->event);
2175 }
2176
2177 strlist__delete(namelist);
2178 close(fd);
2179 return ret;
2180 }
2181
2182 static char *looking_function_name;
2183 static int num_matched_functions;
2184
2185 static int probe_function_filter(struct map *map __maybe_unused,
2186 struct symbol *sym)
2187 {
2188 if ((sym->binding == STB_GLOBAL || sym->binding == STB_LOCAL) &&
2189 strcmp(looking_function_name, sym->name) == 0) {
2190 num_matched_functions++;
2191 return 0;
2192 }
2193 return 1;
2194 }
2195
2196 #define strdup_or_goto(str, label) \
2197 ({ char *__p = strdup(str); if (!__p) goto label; __p; })
2198
2199 /*
2200 * Find probe function addresses from map.
2201 * Return an error or the number of found probe_trace_event
2202 */
2203 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2204 struct probe_trace_event **tevs,
2205 int max_tevs, const char *target)
2206 {
2207 struct map *map = NULL;
2208 struct kmap *kmap = NULL;
2209 struct ref_reloc_sym *reloc_sym = NULL;
2210 struct symbol *sym;
2211 struct rb_node *nd;
2212 struct probe_trace_event *tev;
2213 struct perf_probe_point *pp = &pev->point;
2214 struct probe_trace_point *tp;
2215 int ret, i;
2216
2217 /* Init maps of given executable or kernel */
2218 if (pev->uprobes)
2219 map = dso__new_map(target);
2220 else
2221 map = kernel_get_module_map(target);
2222 if (!map) {
2223 ret = -EINVAL;
2224 goto out;
2225 }
2226
2227 /*
2228 * Load matched symbols: Since the different local symbols may have
2229 * same name but different addresses, this lists all the symbols.
2230 */
2231 num_matched_functions = 0;
2232 looking_function_name = pp->function;
2233 ret = map__load(map, probe_function_filter);
2234 if (ret || num_matched_functions == 0) {
2235 pr_err("Failed to find symbol %s in %s\n", pp->function,
2236 target ? : "kernel");
2237 ret = -ENOENT;
2238 goto out;
2239 } else if (num_matched_functions > max_tevs) {
2240 pr_err("Too many functions matched in %s\n",
2241 target ? : "kernel");
2242 ret = -E2BIG;
2243 goto out;
2244 }
2245
2246 if (!pev->uprobes) {
2247 kmap = map__kmap(map);
2248 reloc_sym = kmap->ref_reloc_sym;
2249 if (!reloc_sym) {
2250 pr_warning("Relocated base symbol is not found!\n");
2251 ret = -EINVAL;
2252 goto out;
2253 }
2254 }
2255
2256 /* Setup result trace-probe-events */
2257 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2258 if (!*tevs) {
2259 ret = -ENOMEM;
2260 goto out;
2261 }
2262
2263 ret = 0;
2264 map__for_each_symbol(map, sym, nd) {
2265 tev = (*tevs) + ret;
2266 tp = &tev->point;
2267 if (ret == num_matched_functions) {
2268 pr_warning("Too many symbols are listed. Skip it.\n");
2269 break;
2270 }
2271 ret++;
2272
2273 if (pp->offset > sym->end - sym->start) {
2274 pr_warning("Offset %ld is bigger than the size of %s\n",
2275 pp->offset, sym->name);
2276 ret = -ENOENT;
2277 goto err_out;
2278 }
2279 /* Add one probe point */
2280 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2281 if (reloc_sym) {
2282 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2283 tp->offset = tp->address - reloc_sym->addr;
2284 } else {
2285 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2286 tp->offset = pp->offset;
2287 }
2288 tp->retprobe = pp->retprobe;
2289 if (target)
2290 tev->point.module = strdup_or_goto(target, nomem_out);
2291 tev->uprobes = pev->uprobes;
2292 tev->nargs = pev->nargs;
2293 if (tev->nargs) {
2294 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2295 tev->nargs);
2296 if (tev->args == NULL)
2297 goto nomem_out;
2298 }
2299 for (i = 0; i < tev->nargs; i++) {
2300 if (pev->args[i].name)
2301 tev->args[i].name =
2302 strdup_or_goto(pev->args[i].name,
2303 nomem_out);
2304
2305 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2306 nomem_out);
2307 if (pev->args[i].type)
2308 tev->args[i].type =
2309 strdup_or_goto(pev->args[i].type,
2310 nomem_out);
2311 }
2312 }
2313
2314 out:
2315 if (map && pev->uprobes) {
2316 /* Only when using uprobe(exec) map needs to be released */
2317 dso__delete(map->dso);
2318 map__delete(map);
2319 }
2320 return ret;
2321
2322 nomem_out:
2323 ret = -ENOMEM;
2324 err_out:
2325 clear_probe_trace_events(*tevs, num_matched_functions);
2326 zfree(tevs);
2327 goto out;
2328 }
2329
2330 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
2331 struct probe_trace_event **tevs,
2332 int max_tevs, const char *target)
2333 {
2334 int ret;
2335
2336 if (pev->uprobes && !pev->group) {
2337 /* Replace group name if not given */
2338 ret = convert_exec_to_group(target, &pev->group);
2339 if (ret != 0) {
2340 pr_warning("Failed to make a group name.\n");
2341 return ret;
2342 }
2343 }
2344
2345 /* Convert perf_probe_event with debuginfo */
2346 ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, target);
2347 if (ret != 0)
2348 return ret; /* Found in debuginfo or got an error */
2349
2350 return find_probe_trace_events_from_map(pev, tevs, max_tevs, target);
2351 }
2352
2353 struct __event_package {
2354 struct perf_probe_event *pev;
2355 struct probe_trace_event *tevs;
2356 int ntevs;
2357 };
2358
2359 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
2360 int max_tevs, const char *target, bool force_add)
2361 {
2362 int i, j, ret;
2363 struct __event_package *pkgs;
2364
2365 ret = 0;
2366 pkgs = zalloc(sizeof(struct __event_package) * npevs);
2367
2368 if (pkgs == NULL)
2369 return -ENOMEM;
2370
2371 ret = init_symbol_maps(pevs->uprobes);
2372 if (ret < 0) {
2373 free(pkgs);
2374 return ret;
2375 }
2376
2377 /* Loop 1: convert all events */
2378 for (i = 0; i < npevs; i++) {
2379 pkgs[i].pev = &pevs[i];
2380 /* Convert with or without debuginfo */
2381 ret = convert_to_probe_trace_events(pkgs[i].pev,
2382 &pkgs[i].tevs,
2383 max_tevs,
2384 target);
2385 if (ret < 0)
2386 goto end;
2387 pkgs[i].ntevs = ret;
2388 }
2389
2390 /* Loop 2: add all events */
2391 for (i = 0; i < npevs; i++) {
2392 ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
2393 pkgs[i].ntevs, force_add);
2394 if (ret < 0)
2395 break;
2396 }
2397 end:
2398 /* Loop 3: cleanup and free trace events */
2399 for (i = 0; i < npevs; i++) {
2400 for (j = 0; j < pkgs[i].ntevs; j++)
2401 clear_probe_trace_event(&pkgs[i].tevs[j]);
2402 zfree(&pkgs[i].tevs);
2403 }
2404 free(pkgs);
2405 exit_symbol_maps();
2406
2407 return ret;
2408 }
2409
2410 static int __del_trace_probe_event(int fd, struct str_node *ent)
2411 {
2412 char *p;
2413 char buf[128];
2414 int ret;
2415
2416 /* Convert from perf-probe event to trace-probe event */
2417 ret = e_snprintf(buf, 128, "-:%s", ent->s);
2418 if (ret < 0)
2419 goto error;
2420
2421 p = strchr(buf + 2, ':');
2422 if (!p) {
2423 pr_debug("Internal error: %s should have ':' but not.\n",
2424 ent->s);
2425 ret = -ENOTSUP;
2426 goto error;
2427 }
2428 *p = '/';
2429
2430 pr_debug("Writing event: %s\n", buf);
2431 ret = write(fd, buf, strlen(buf));
2432 if (ret < 0) {
2433 ret = -errno;
2434 goto error;
2435 }
2436
2437 printf("Removed event: %s\n", ent->s);
2438 return 0;
2439 error:
2440 pr_warning("Failed to delete event: %s\n", strerror(-ret));
2441 return ret;
2442 }
2443
2444 static int del_trace_probe_event(int fd, const char *buf,
2445 struct strlist *namelist)
2446 {
2447 struct str_node *ent, *n;
2448 int ret = -1;
2449
2450 if (strpbrk(buf, "*?")) { /* Glob-exp */
2451 strlist__for_each_safe(ent, n, namelist)
2452 if (strglobmatch(ent->s, buf)) {
2453 ret = __del_trace_probe_event(fd, ent);
2454 if (ret < 0)
2455 break;
2456 strlist__remove(namelist, ent);
2457 }
2458 } else {
2459 ent = strlist__find(namelist, buf);
2460 if (ent) {
2461 ret = __del_trace_probe_event(fd, ent);
2462 if (ret >= 0)
2463 strlist__remove(namelist, ent);
2464 }
2465 }
2466
2467 return ret;
2468 }
2469
2470 int del_perf_probe_events(struct strlist *dellist)
2471 {
2472 int ret = -1, ufd = -1, kfd = -1;
2473 char buf[128];
2474 const char *group, *event;
2475 char *p, *str;
2476 struct str_node *ent;
2477 struct strlist *namelist = NULL, *unamelist = NULL;
2478
2479 /* Get current event names */
2480 kfd = open_kprobe_events(true);
2481 if (kfd >= 0)
2482 namelist = get_probe_trace_event_names(kfd, true);
2483
2484 ufd = open_uprobe_events(true);
2485 if (ufd >= 0)
2486 unamelist = get_probe_trace_event_names(ufd, true);
2487
2488 if (kfd < 0 && ufd < 0) {
2489 print_both_open_warning(kfd, ufd);
2490 goto error;
2491 }
2492
2493 if (namelist == NULL && unamelist == NULL)
2494 goto error;
2495
2496 strlist__for_each(ent, dellist) {
2497 str = strdup(ent->s);
2498 if (str == NULL) {
2499 ret = -ENOMEM;
2500 goto error;
2501 }
2502 pr_debug("Parsing: %s\n", str);
2503 p = strchr(str, ':');
2504 if (p) {
2505 group = str;
2506 *p = '\0';
2507 event = p + 1;
2508 } else {
2509 group = "*";
2510 event = str;
2511 }
2512
2513 ret = e_snprintf(buf, 128, "%s:%s", group, event);
2514 if (ret < 0) {
2515 pr_err("Failed to copy event.");
2516 free(str);
2517 goto error;
2518 }
2519
2520 pr_debug("Group: %s, Event: %s\n", group, event);
2521
2522 if (namelist)
2523 ret = del_trace_probe_event(kfd, buf, namelist);
2524
2525 if (unamelist && ret != 0)
2526 ret = del_trace_probe_event(ufd, buf, unamelist);
2527
2528 if (ret != 0)
2529 pr_info("Info: Event \"%s\" does not exist.\n", buf);
2530
2531 free(str);
2532 }
2533
2534 error:
2535 if (kfd >= 0) {
2536 strlist__delete(namelist);
2537 close(kfd);
2538 }
2539
2540 if (ufd >= 0) {
2541 strlist__delete(unamelist);
2542 close(ufd);
2543 }
2544
2545 return ret;
2546 }
2547
2548 /* TODO: don't use a global variable for filter ... */
2549 static struct strfilter *available_func_filter;
2550
2551 /*
2552 * If a symbol corresponds to a function with global binding and
2553 * matches filter return 0. For all others return 1.
2554 */
2555 static int filter_available_functions(struct map *map __maybe_unused,
2556 struct symbol *sym)
2557 {
2558 if ((sym->binding == STB_GLOBAL || sym->binding == STB_LOCAL) &&
2559 strfilter__compare(available_func_filter, sym->name))
2560 return 0;
2561 return 1;
2562 }
2563
2564 int show_available_funcs(const char *target, struct strfilter *_filter,
2565 bool user)
2566 {
2567 struct map *map;
2568 int ret;
2569
2570 ret = init_symbol_maps(user);
2571 if (ret < 0)
2572 return ret;
2573
2574 /* Get a symbol map */
2575 if (user)
2576 map = dso__new_map(target);
2577 else
2578 map = kernel_get_module_map(target);
2579 if (!map) {
2580 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
2581 return -EINVAL;
2582 }
2583
2584 /* Load symbols with given filter */
2585 available_func_filter = _filter;
2586 if (map__load(map, filter_available_functions)) {
2587 pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
2588 goto end;
2589 }
2590 if (!dso__sorted_by_name(map->dso, map->type))
2591 dso__sort_by_name(map->dso, map->type);
2592
2593 /* Show all (filtered) symbols */
2594 setup_pager();
2595 dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
2596 end:
2597 if (user) {
2598 dso__delete(map->dso);
2599 map__delete(map);
2600 }
2601 exit_symbol_maps();
2602
2603 return ret;
2604 }
2605
Linux kernel - Deliverables
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