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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 | #define _GNU_SOURCE |
23 | #include <sys/utsname.h> |
24 | #include <sys/types.h> |
25 | #include <sys/stat.h> |
26 | #include <fcntl.h> |
27 | #include <errno.h> |
28 | #include <stdio.h> |
29 | #include <unistd.h> |
30 | #include <stdlib.h> |
31 | #include <string.h> |
32 | #include <stdarg.h> |
33 | #include <limits.h> |
34 | #include <elf.h> |
35 | |
36 | #undef _GNU_SOURCE |
37 | #include "util.h" |
38 | #include "event.h" |
39 | #include "string.h" |
40 | #include "strlist.h" |
41 | #include "debug.h" |
42 | #include "cache.h" |
43 | #include "color.h" |
44 | #include "symbol.h" |
45 | #include "thread.h" |
46 | #include "debugfs.h" |
47 | #include "trace-event.h" /* For __unused */ |
48 | #include "probe-event.h" |
49 | #include "probe-finder.h" |
50 | |
51 | #define MAX_CMDLEN 256 |
52 | #define MAX_PROBE_ARGS 128 |
53 | #define PERFPROBE_GROUP "probe" |
54 | |
55 | bool probe_event_dry_run; /* Dry run flag */ |
56 | |
57 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
58 | |
59 | /* If there is no space to write, returns -E2BIG. */ |
60 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
61 | __attribute__((format(printf, 3, 4))); |
62 | |
63 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
64 | { |
65 | int ret; |
66 | va_list ap; |
67 | va_start(ap, format); |
68 | ret = vsnprintf(str, size, format, ap); |
69 | va_end(ap); |
70 | if (ret >= (int)size) |
71 | ret = -E2BIG; |
72 | return ret; |
73 | } |
74 | |
75 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp); |
76 | static struct machine machine; |
77 | |
78 | /* Initialize symbol maps and path of vmlinux/modules */ |
79 | static int init_vmlinux(void) |
80 | { |
81 | int ret; |
82 | |
83 | symbol_conf.sort_by_name = true; |
84 | if (symbol_conf.vmlinux_name == NULL) |
85 | symbol_conf.try_vmlinux_path = true; |
86 | else |
87 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); |
88 | ret = symbol__init(); |
89 | if (ret < 0) { |
90 | pr_debug("Failed to init symbol map.\n"); |
91 | goto out; |
92 | } |
93 | |
94 | ret = machine__init(&machine, "", HOST_KERNEL_ID); |
95 | if (ret < 0) |
96 | goto out; |
97 | |
98 | if (machine__create_kernel_maps(&machine) < 0) { |
99 | pr_debug("machine__create_kernel_maps() failed.\n"); |
100 | goto out; |
101 | } |
102 | out: |
103 | if (ret < 0) |
104 | pr_warning("Failed to init vmlinux path.\n"); |
105 | return ret; |
106 | } |
107 | |
108 | static struct symbol *__find_kernel_function_by_name(const char *name, |
109 | struct map **mapp) |
110 | { |
111 | return machine__find_kernel_function_by_name(&machine, name, mapp, |
112 | NULL); |
113 | } |
114 | |
115 | static struct map *kernel_get_module_map(const char *module) |
116 | { |
117 | struct rb_node *nd; |
118 | struct map_groups *grp = &machine.kmaps; |
119 | |
120 | if (!module) |
121 | module = "kernel"; |
122 | |
123 | for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) { |
124 | struct map *pos = rb_entry(nd, struct map, rb_node); |
125 | if (strncmp(pos->dso->short_name + 1, module, |
126 | pos->dso->short_name_len - 2) == 0) { |
127 | return pos; |
128 | } |
129 | } |
130 | return NULL; |
131 | } |
132 | |
133 | static struct dso *kernel_get_module_dso(const char *module) |
134 | { |
135 | struct dso *dso; |
136 | struct map *map; |
137 | const char *vmlinux_name; |
138 | |
139 | if (module) { |
140 | list_for_each_entry(dso, &machine.kernel_dsos, node) { |
141 | if (strncmp(dso->short_name + 1, module, |
142 | dso->short_name_len - 2) == 0) |
143 | goto found; |
144 | } |
145 | pr_debug("Failed to find module %s.\n", module); |
146 | return NULL; |
147 | } |
148 | |
149 | map = machine.vmlinux_maps[MAP__FUNCTION]; |
150 | dso = map->dso; |
151 | |
152 | vmlinux_name = symbol_conf.vmlinux_name; |
153 | if (vmlinux_name) { |
154 | if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0) |
155 | return NULL; |
156 | } else { |
157 | if (dso__load_vmlinux_path(dso, map, NULL) <= 0) { |
158 | pr_debug("Failed to load kernel map.\n"); |
159 | return NULL; |
160 | } |
161 | } |
162 | found: |
163 | return dso; |
164 | } |
165 | |
166 | const char *kernel_get_module_path(const char *module) |
167 | { |
168 | struct dso *dso = kernel_get_module_dso(module); |
169 | return (dso) ? dso->long_name : NULL; |
170 | } |
171 | |
172 | #ifdef DWARF_SUPPORT |
173 | static int open_vmlinux(const char *module) |
174 | { |
175 | const char *path = kernel_get_module_path(module); |
176 | if (!path) { |
177 | pr_err("Failed to find path of %s module.\n", |
178 | module ?: "kernel"); |
179 | return -ENOENT; |
180 | } |
181 | pr_debug("Try to open %s\n", path); |
182 | return open(path, O_RDONLY); |
183 | } |
184 | |
185 | /* |
186 | * Convert trace point to probe point with debuginfo |
187 | * Currently only handles kprobes. |
188 | */ |
189 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, |
190 | struct perf_probe_point *pp) |
191 | { |
192 | struct symbol *sym; |
193 | struct map *map; |
194 | u64 addr; |
195 | int ret = -ENOENT; |
196 | |
197 | sym = __find_kernel_function_by_name(tp->symbol, &map); |
198 | if (sym) { |
199 | addr = map->unmap_ip(map, sym->start + tp->offset); |
200 | pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol, |
201 | tp->offset, addr); |
202 | ret = find_perf_probe_point((unsigned long)addr, pp); |
203 | } |
204 | if (ret <= 0) { |
205 | pr_debug("Failed to find corresponding probes from " |
206 | "debuginfo. Use kprobe event information.\n"); |
207 | pp->function = strdup(tp->symbol); |
208 | if (pp->function == NULL) |
209 | return -ENOMEM; |
210 | pp->offset = tp->offset; |
211 | } |
212 | pp->retprobe = tp->retprobe; |
213 | |
214 | return 0; |
215 | } |
216 | |
217 | /* Try to find perf_probe_event with debuginfo */ |
218 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
219 | struct probe_trace_event **tevs, |
220 | int max_tevs, const char *module) |
221 | { |
222 | bool need_dwarf = perf_probe_event_need_dwarf(pev); |
223 | int fd, ntevs; |
224 | |
225 | fd = open_vmlinux(module); |
226 | if (fd < 0) { |
227 | if (need_dwarf) { |
228 | pr_warning("Failed to open debuginfo file.\n"); |
229 | return fd; |
230 | } |
231 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
232 | return 0; |
233 | } |
234 | |
235 | /* Searching trace events corresponding to probe event */ |
236 | ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs); |
237 | |
238 | if (ntevs > 0) { /* Succeeded to find trace events */ |
239 | pr_debug("find %d probe_trace_events.\n", ntevs); |
240 | return ntevs; |
241 | } |
242 | |
243 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
244 | pr_warning("Probe point '%s' not found.\n", |
245 | synthesize_perf_probe_point(&pev->point)); |
246 | return -ENOENT; |
247 | } |
248 | /* Error path : ntevs < 0 */ |
249 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
250 | if (ntevs == -EBADF) { |
251 | pr_warning("Warning: No dwarf info found in the vmlinux - " |
252 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); |
253 | if (!need_dwarf) { |
254 | pr_debug("Trying to use symbols.\n"); |
255 | return 0; |
256 | } |
257 | } |
258 | return ntevs; |
259 | } |
260 | |
261 | /* |
262 | * Find a src file from a DWARF tag path. Prepend optional source path prefix |
263 | * and chop off leading directories that do not exist. Result is passed back as |
264 | * a newly allocated path on success. |
265 | * Return 0 if file was found and readable, -errno otherwise. |
266 | */ |
267 | static int get_real_path(const char *raw_path, const char *comp_dir, |
268 | char **new_path) |
269 | { |
270 | const char *prefix = symbol_conf.source_prefix; |
271 | |
272 | if (!prefix) { |
273 | if (raw_path[0] != '/' && comp_dir) |
274 | /* If not an absolute path, try to use comp_dir */ |
275 | prefix = comp_dir; |
276 | else { |
277 | if (access(raw_path, R_OK) == 0) { |
278 | *new_path = strdup(raw_path); |
279 | return 0; |
280 | } else |
281 | return -errno; |
282 | } |
283 | } |
284 | |
285 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); |
286 | if (!*new_path) |
287 | return -ENOMEM; |
288 | |
289 | for (;;) { |
290 | sprintf(*new_path, "%s/%s", prefix, raw_path); |
291 | |
292 | if (access(*new_path, R_OK) == 0) |
293 | return 0; |
294 | |
295 | if (!symbol_conf.source_prefix) |
296 | /* In case of searching comp_dir, don't retry */ |
297 | return -errno; |
298 | |
299 | switch (errno) { |
300 | case ENAMETOOLONG: |
301 | case ENOENT: |
302 | case EROFS: |
303 | case EFAULT: |
304 | raw_path = strchr(++raw_path, '/'); |
305 | if (!raw_path) { |
306 | free(*new_path); |
307 | *new_path = NULL; |
308 | return -ENOENT; |
309 | } |
310 | continue; |
311 | |
312 | default: |
313 | free(*new_path); |
314 | *new_path = NULL; |
315 | return -errno; |
316 | } |
317 | } |
318 | } |
319 | |
320 | #define LINEBUF_SIZE 256 |
321 | #define NR_ADDITIONAL_LINES 2 |
322 | |
323 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
324 | { |
325 | char buf[LINEBUF_SIZE]; |
326 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
327 | const char *prefix = NULL; |
328 | |
329 | do { |
330 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
331 | goto error; |
332 | if (skip) |
333 | continue; |
334 | if (!prefix) { |
335 | prefix = show_num ? "%7d " : " "; |
336 | color_fprintf(stdout, color, prefix, l); |
337 | } |
338 | color_fprintf(stdout, color, "%s", buf); |
339 | |
340 | } while (strchr(buf, '\n') == NULL); |
341 | |
342 | return 1; |
343 | error: |
344 | if (ferror(fp)) { |
345 | pr_warning("File read error: %s\n", strerror(errno)); |
346 | return -1; |
347 | } |
348 | return 0; |
349 | } |
350 | |
351 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
352 | { |
353 | int rv = __show_one_line(fp, l, skip, show_num); |
354 | if (rv == 0) { |
355 | pr_warning("Source file is shorter than expected.\n"); |
356 | rv = -1; |
357 | } |
358 | return rv; |
359 | } |
360 | |
361 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
362 | #define show_one_line(f,l) _show_one_line(f,l,false,false) |
363 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) |
364 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) |
365 | |
366 | /* |
367 | * Show line-range always requires debuginfo to find source file and |
368 | * line number. |
369 | */ |
370 | int show_line_range(struct line_range *lr, const char *module) |
371 | { |
372 | int l = 1; |
373 | struct line_node *ln; |
374 | FILE *fp; |
375 | int fd, ret; |
376 | char *tmp; |
377 | |
378 | /* Search a line range */ |
379 | ret = init_vmlinux(); |
380 | if (ret < 0) |
381 | return ret; |
382 | |
383 | fd = open_vmlinux(module); |
384 | if (fd < 0) { |
385 | pr_warning("Failed to open debuginfo file.\n"); |
386 | return fd; |
387 | } |
388 | |
389 | ret = find_line_range(fd, lr); |
390 | if (ret == 0) { |
391 | pr_warning("Specified source line is not found.\n"); |
392 | return -ENOENT; |
393 | } else if (ret < 0) { |
394 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); |
395 | return ret; |
396 | } |
397 | |
398 | /* Convert source file path */ |
399 | tmp = lr->path; |
400 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
401 | free(tmp); /* Free old path */ |
402 | if (ret < 0) { |
403 | pr_warning("Failed to find source file. (%d)\n", ret); |
404 | return ret; |
405 | } |
406 | |
407 | setup_pager(); |
408 | |
409 | if (lr->function) |
410 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
411 | lr->start - lr->offset); |
412 | else |
413 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
414 | |
415 | fp = fopen(lr->path, "r"); |
416 | if (fp == NULL) { |
417 | pr_warning("Failed to open %s: %s\n", lr->path, |
418 | strerror(errno)); |
419 | return -errno; |
420 | } |
421 | /* Skip to starting line number */ |
422 | while (l < lr->start) { |
423 | ret = skip_one_line(fp, l++); |
424 | if (ret < 0) |
425 | goto end; |
426 | } |
427 | |
428 | list_for_each_entry(ln, &lr->line_list, list) { |
429 | for (; ln->line > l; l++) { |
430 | ret = show_one_line(fp, l - lr->offset); |
431 | if (ret < 0) |
432 | goto end; |
433 | } |
434 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
435 | if (ret < 0) |
436 | goto end; |
437 | } |
438 | |
439 | if (lr->end == INT_MAX) |
440 | lr->end = l + NR_ADDITIONAL_LINES; |
441 | while (l <= lr->end) { |
442 | ret = show_one_line_or_eof(fp, l++ - lr->offset); |
443 | if (ret <= 0) |
444 | break; |
445 | } |
446 | end: |
447 | fclose(fp); |
448 | return ret; |
449 | } |
450 | |
451 | static int show_available_vars_at(int fd, struct perf_probe_event *pev, |
452 | int max_vls, struct strfilter *_filter, |
453 | bool externs) |
454 | { |
455 | char *buf; |
456 | int ret, i, nvars; |
457 | struct str_node *node; |
458 | struct variable_list *vls = NULL, *vl; |
459 | const char *var; |
460 | |
461 | buf = synthesize_perf_probe_point(&pev->point); |
462 | if (!buf) |
463 | return -EINVAL; |
464 | pr_debug("Searching variables at %s\n", buf); |
465 | |
466 | ret = find_available_vars_at(fd, pev, &vls, max_vls, externs); |
467 | if (ret <= 0) { |
468 | pr_err("Failed to find variables at %s (%d)\n", buf, ret); |
469 | goto end; |
470 | } |
471 | /* Some variables are found */ |
472 | fprintf(stdout, "Available variables at %s\n", buf); |
473 | for (i = 0; i < ret; i++) { |
474 | vl = &vls[i]; |
475 | /* |
476 | * A probe point might be converted to |
477 | * several trace points. |
478 | */ |
479 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, |
480 | vl->point.offset); |
481 | free(vl->point.symbol); |
482 | nvars = 0; |
483 | if (vl->vars) { |
484 | strlist__for_each(node, vl->vars) { |
485 | var = strchr(node->s, '\t') + 1; |
486 | if (strfilter__compare(_filter, var)) { |
487 | fprintf(stdout, "\t\t%s\n", node->s); |
488 | nvars++; |
489 | } |
490 | } |
491 | strlist__delete(vl->vars); |
492 | } |
493 | if (nvars == 0) |
494 | fprintf(stdout, "\t\t(No matched variables)\n"); |
495 | } |
496 | free(vls); |
497 | end: |
498 | free(buf); |
499 | return ret; |
500 | } |
501 | |
502 | /* Show available variables on given probe point */ |
503 | int show_available_vars(struct perf_probe_event *pevs, int npevs, |
504 | int max_vls, const char *module, |
505 | struct strfilter *_filter, bool externs) |
506 | { |
507 | int i, fd, ret = 0; |
508 | |
509 | ret = init_vmlinux(); |
510 | if (ret < 0) |
511 | return ret; |
512 | |
513 | setup_pager(); |
514 | |
515 | for (i = 0; i < npevs && ret >= 0; i++) { |
516 | fd = open_vmlinux(module); |
517 | if (fd < 0) { |
518 | pr_warning("Failed to open debug information file.\n"); |
519 | ret = fd; |
520 | break; |
521 | } |
522 | ret = show_available_vars_at(fd, &pevs[i], max_vls, _filter, |
523 | externs); |
524 | } |
525 | return ret; |
526 | } |
527 | |
528 | #else /* !DWARF_SUPPORT */ |
529 | |
530 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, |
531 | struct perf_probe_point *pp) |
532 | { |
533 | struct symbol *sym; |
534 | |
535 | sym = __find_kernel_function_by_name(tp->symbol, NULL); |
536 | if (!sym) { |
537 | pr_err("Failed to find symbol %s in kernel.\n", tp->symbol); |
538 | return -ENOENT; |
539 | } |
540 | pp->function = strdup(tp->symbol); |
541 | if (pp->function == NULL) |
542 | return -ENOMEM; |
543 | pp->offset = tp->offset; |
544 | pp->retprobe = tp->retprobe; |
545 | |
546 | return 0; |
547 | } |
548 | |
549 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
550 | struct probe_trace_event **tevs __unused, |
551 | int max_tevs __unused, const char *mod __unused) |
552 | { |
553 | if (perf_probe_event_need_dwarf(pev)) { |
554 | pr_warning("Debuginfo-analysis is not supported.\n"); |
555 | return -ENOSYS; |
556 | } |
557 | return 0; |
558 | } |
559 | |
560 | int show_line_range(struct line_range *lr __unused, const char *module __unused) |
561 | { |
562 | pr_warning("Debuginfo-analysis is not supported.\n"); |
563 | return -ENOSYS; |
564 | } |
565 | |
566 | int show_available_vars(struct perf_probe_event *pevs __unused, |
567 | int npevs __unused, int max_vls __unused, |
568 | const char *module __unused, |
569 | struct strfilter *filter __unused, |
570 | bool externs __unused) |
571 | { |
572 | pr_warning("Debuginfo-analysis is not supported.\n"); |
573 | return -ENOSYS; |
574 | } |
575 | #endif |
576 | |
577 | static int parse_line_num(char **ptr, int *val, const char *what) |
578 | { |
579 | const char *start = *ptr; |
580 | |
581 | errno = 0; |
582 | *val = strtol(*ptr, ptr, 0); |
583 | if (errno || *ptr == start) { |
584 | semantic_error("'%s' is not a valid number.\n", what); |
585 | return -EINVAL; |
586 | } |
587 | return 0; |
588 | } |
589 | |
590 | /* |
591 | * Stuff 'lr' according to the line range described by 'arg'. |
592 | * The line range syntax is described by: |
593 | * |
594 | * SRC[:SLN[+NUM|-ELN]] |
595 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
596 | */ |
597 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
598 | { |
599 | char *range, *file, *name = strdup(arg); |
600 | int err; |
601 | |
602 | if (!name) |
603 | return -ENOMEM; |
604 | |
605 | lr->start = 0; |
606 | lr->end = INT_MAX; |
607 | |
608 | range = strchr(name, ':'); |
609 | if (range) { |
610 | *range++ = '\0'; |
611 | |
612 | err = parse_line_num(&range, &lr->start, "start line"); |
613 | if (err) |
614 | goto err; |
615 | |
616 | if (*range == '+' || *range == '-') { |
617 | const char c = *range++; |
618 | |
619 | err = parse_line_num(&range, &lr->end, "end line"); |
620 | if (err) |
621 | goto err; |
622 | |
623 | if (c == '+') { |
624 | lr->end += lr->start; |
625 | /* |
626 | * Adjust the number of lines here. |
627 | * If the number of lines == 1, the |
628 | * the end of line should be equal to |
629 | * the start of line. |
630 | */ |
631 | lr->end--; |
632 | } |
633 | } |
634 | |
635 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
636 | |
637 | err = -EINVAL; |
638 | if (lr->start > lr->end) { |
639 | semantic_error("Start line must be smaller" |
640 | " than end line.\n"); |
641 | goto err; |
642 | } |
643 | if (*range != '\0') { |
644 | semantic_error("Tailing with invalid str '%s'.\n", range); |
645 | goto err; |
646 | } |
647 | } |
648 | |
649 | file = strchr(name, '@'); |
650 | if (file) { |
651 | *file = '\0'; |
652 | lr->file = strdup(++file); |
653 | if (lr->file == NULL) { |
654 | err = -ENOMEM; |
655 | goto err; |
656 | } |
657 | lr->function = name; |
658 | } else if (strchr(name, '.')) |
659 | lr->file = name; |
660 | else |
661 | lr->function = name; |
662 | |
663 | return 0; |
664 | err: |
665 | free(name); |
666 | return err; |
667 | } |
668 | |
669 | /* Check the name is good for event/group */ |
670 | static bool check_event_name(const char *name) |
671 | { |
672 | if (!isalpha(*name) && *name != '_') |
673 | return false; |
674 | while (*++name != '\0') { |
675 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') |
676 | return false; |
677 | } |
678 | return true; |
679 | } |
680 | |
681 | /* Parse probepoint definition. */ |
682 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
683 | { |
684 | struct perf_probe_point *pp = &pev->point; |
685 | char *ptr, *tmp; |
686 | char c, nc = 0; |
687 | /* |
688 | * <Syntax> |
689 | * perf probe [EVENT=]SRC[:LN|;PTN] |
690 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] |
691 | * |
692 | * TODO:Group name support |
693 | */ |
694 | |
695 | ptr = strpbrk(arg, ";=@+%"); |
696 | if (ptr && *ptr == '=') { /* Event name */ |
697 | *ptr = '\0'; |
698 | tmp = ptr + 1; |
699 | if (strchr(arg, ':')) { |
700 | semantic_error("Group name is not supported yet.\n"); |
701 | return -ENOTSUP; |
702 | } |
703 | if (!check_event_name(arg)) { |
704 | semantic_error("%s is bad for event name -it must " |
705 | "follow C symbol-naming rule.\n", arg); |
706 | return -EINVAL; |
707 | } |
708 | pev->event = strdup(arg); |
709 | if (pev->event == NULL) |
710 | return -ENOMEM; |
711 | pev->group = NULL; |
712 | arg = tmp; |
713 | } |
714 | |
715 | ptr = strpbrk(arg, ";:+@%"); |
716 | if (ptr) { |
717 | nc = *ptr; |
718 | *ptr++ = '\0'; |
719 | } |
720 | |
721 | tmp = strdup(arg); |
722 | if (tmp == NULL) |
723 | return -ENOMEM; |
724 | |
725 | /* Check arg is function or file and copy it */ |
726 | if (strchr(tmp, '.')) /* File */ |
727 | pp->file = tmp; |
728 | else /* Function */ |
729 | pp->function = tmp; |
730 | |
731 | /* Parse other options */ |
732 | while (ptr) { |
733 | arg = ptr; |
734 | c = nc; |
735 | if (c == ';') { /* Lazy pattern must be the last part */ |
736 | pp->lazy_line = strdup(arg); |
737 | if (pp->lazy_line == NULL) |
738 | return -ENOMEM; |
739 | break; |
740 | } |
741 | ptr = strpbrk(arg, ";:+@%"); |
742 | if (ptr) { |
743 | nc = *ptr; |
744 | *ptr++ = '\0'; |
745 | } |
746 | switch (c) { |
747 | case ':': /* Line number */ |
748 | pp->line = strtoul(arg, &tmp, 0); |
749 | if (*tmp != '\0') { |
750 | semantic_error("There is non-digit char" |
751 | " in line number.\n"); |
752 | return -EINVAL; |
753 | } |
754 | break; |
755 | case '+': /* Byte offset from a symbol */ |
756 | pp->offset = strtoul(arg, &tmp, 0); |
757 | if (*tmp != '\0') { |
758 | semantic_error("There is non-digit character" |
759 | " in offset.\n"); |
760 | return -EINVAL; |
761 | } |
762 | break; |
763 | case '@': /* File name */ |
764 | if (pp->file) { |
765 | semantic_error("SRC@SRC is not allowed.\n"); |
766 | return -EINVAL; |
767 | } |
768 | pp->file = strdup(arg); |
769 | if (pp->file == NULL) |
770 | return -ENOMEM; |
771 | break; |
772 | case '%': /* Probe places */ |
773 | if (strcmp(arg, "return") == 0) { |
774 | pp->retprobe = 1; |
775 | } else { /* Others not supported yet */ |
776 | semantic_error("%%%s is not supported.\n", arg); |
777 | return -ENOTSUP; |
778 | } |
779 | break; |
780 | default: /* Buggy case */ |
781 | pr_err("This program has a bug at %s:%d.\n", |
782 | __FILE__, __LINE__); |
783 | return -ENOTSUP; |
784 | break; |
785 | } |
786 | } |
787 | |
788 | /* Exclusion check */ |
789 | if (pp->lazy_line && pp->line) { |
790 | semantic_error("Lazy pattern can't be used with" |
791 | " line number.\n"); |
792 | return -EINVAL; |
793 | } |
794 | |
795 | if (pp->lazy_line && pp->offset) { |
796 | semantic_error("Lazy pattern can't be used with offset.\n"); |
797 | return -EINVAL; |
798 | } |
799 | |
800 | if (pp->line && pp->offset) { |
801 | semantic_error("Offset can't be used with line number.\n"); |
802 | return -EINVAL; |
803 | } |
804 | |
805 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
806 | semantic_error("File always requires line number or " |
807 | "lazy pattern.\n"); |
808 | return -EINVAL; |
809 | } |
810 | |
811 | if (pp->offset && !pp->function) { |
812 | semantic_error("Offset requires an entry function.\n"); |
813 | return -EINVAL; |
814 | } |
815 | |
816 | if (pp->retprobe && !pp->function) { |
817 | semantic_error("Return probe requires an entry function.\n"); |
818 | return -EINVAL; |
819 | } |
820 | |
821 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
822 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
823 | "return probe.\n"); |
824 | return -EINVAL; |
825 | } |
826 | |
827 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
828 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
829 | pp->lazy_line); |
830 | return 0; |
831 | } |
832 | |
833 | /* Parse perf-probe event argument */ |
834 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
835 | { |
836 | char *tmp, *goodname; |
837 | struct perf_probe_arg_field **fieldp; |
838 | |
839 | pr_debug("parsing arg: %s into ", str); |
840 | |
841 | tmp = strchr(str, '='); |
842 | if (tmp) { |
843 | arg->name = strndup(str, tmp - str); |
844 | if (arg->name == NULL) |
845 | return -ENOMEM; |
846 | pr_debug("name:%s ", arg->name); |
847 | str = tmp + 1; |
848 | } |
849 | |
850 | tmp = strchr(str, ':'); |
851 | if (tmp) { /* Type setting */ |
852 | *tmp = '\0'; |
853 | arg->type = strdup(tmp + 1); |
854 | if (arg->type == NULL) |
855 | return -ENOMEM; |
856 | pr_debug("type:%s ", arg->type); |
857 | } |
858 | |
859 | tmp = strpbrk(str, "-.["); |
860 | if (!is_c_varname(str) || !tmp) { |
861 | /* A variable, register, symbol or special value */ |
862 | arg->var = strdup(str); |
863 | if (arg->var == NULL) |
864 | return -ENOMEM; |
865 | pr_debug("%s\n", arg->var); |
866 | return 0; |
867 | } |
868 | |
869 | /* Structure fields or array element */ |
870 | arg->var = strndup(str, tmp - str); |
871 | if (arg->var == NULL) |
872 | return -ENOMEM; |
873 | goodname = arg->var; |
874 | pr_debug("%s, ", arg->var); |
875 | fieldp = &arg->field; |
876 | |
877 | do { |
878 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
879 | if (*fieldp == NULL) |
880 | return -ENOMEM; |
881 | if (*tmp == '[') { /* Array */ |
882 | str = tmp; |
883 | (*fieldp)->index = strtol(str + 1, &tmp, 0); |
884 | (*fieldp)->ref = true; |
885 | if (*tmp != ']' || tmp == str + 1) { |
886 | semantic_error("Array index must be a" |
887 | " number.\n"); |
888 | return -EINVAL; |
889 | } |
890 | tmp++; |
891 | if (*tmp == '\0') |
892 | tmp = NULL; |
893 | } else { /* Structure */ |
894 | if (*tmp == '.') { |
895 | str = tmp + 1; |
896 | (*fieldp)->ref = false; |
897 | } else if (tmp[1] == '>') { |
898 | str = tmp + 2; |
899 | (*fieldp)->ref = true; |
900 | } else { |
901 | semantic_error("Argument parse error: %s\n", |
902 | str); |
903 | return -EINVAL; |
904 | } |
905 | tmp = strpbrk(str, "-.["); |
906 | } |
907 | if (tmp) { |
908 | (*fieldp)->name = strndup(str, tmp - str); |
909 | if ((*fieldp)->name == NULL) |
910 | return -ENOMEM; |
911 | if (*str != '[') |
912 | goodname = (*fieldp)->name; |
913 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
914 | fieldp = &(*fieldp)->next; |
915 | } |
916 | } while (tmp); |
917 | (*fieldp)->name = strdup(str); |
918 | if ((*fieldp)->name == NULL) |
919 | return -ENOMEM; |
920 | if (*str != '[') |
921 | goodname = (*fieldp)->name; |
922 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
923 | |
924 | /* If no name is specified, set the last field name (not array index)*/ |
925 | if (!arg->name) { |
926 | arg->name = strdup(goodname); |
927 | if (arg->name == NULL) |
928 | return -ENOMEM; |
929 | } |
930 | return 0; |
931 | } |
932 | |
933 | /* Parse perf-probe event command */ |
934 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
935 | { |
936 | char **argv; |
937 | int argc, i, ret = 0; |
938 | |
939 | argv = argv_split(cmd, &argc); |
940 | if (!argv) { |
941 | pr_debug("Failed to split arguments.\n"); |
942 | return -ENOMEM; |
943 | } |
944 | if (argc - 1 > MAX_PROBE_ARGS) { |
945 | semantic_error("Too many probe arguments (%d).\n", argc - 1); |
946 | ret = -ERANGE; |
947 | goto out; |
948 | } |
949 | /* Parse probe point */ |
950 | ret = parse_perf_probe_point(argv[0], pev); |
951 | if (ret < 0) |
952 | goto out; |
953 | |
954 | /* Copy arguments and ensure return probe has no C argument */ |
955 | pev->nargs = argc - 1; |
956 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
957 | if (pev->args == NULL) { |
958 | ret = -ENOMEM; |
959 | goto out; |
960 | } |
961 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
962 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); |
963 | if (ret >= 0 && |
964 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { |
965 | semantic_error("You can't specify local variable for" |
966 | " kretprobe.\n"); |
967 | ret = -EINVAL; |
968 | } |
969 | } |
970 | out: |
971 | argv_free(argv); |
972 | |
973 | return ret; |
974 | } |
975 | |
976 | /* Return true if this perf_probe_event requires debuginfo */ |
977 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) |
978 | { |
979 | int i; |
980 | |
981 | if (pev->point.file || pev->point.line || pev->point.lazy_line) |
982 | return true; |
983 | |
984 | for (i = 0; i < pev->nargs; i++) |
985 | if (is_c_varname(pev->args[i].var)) |
986 | return true; |
987 | |
988 | return false; |
989 | } |
990 | |
991 | /* Parse probe_events event into struct probe_point */ |
992 | static int parse_probe_trace_command(const char *cmd, |
993 | struct probe_trace_event *tev) |
994 | { |
995 | struct probe_trace_point *tp = &tev->point; |
996 | char pr; |
997 | char *p; |
998 | int ret, i, argc; |
999 | char **argv; |
1000 | |
1001 | pr_debug("Parsing probe_events: %s\n", cmd); |
1002 | argv = argv_split(cmd, &argc); |
1003 | if (!argv) { |
1004 | pr_debug("Failed to split arguments.\n"); |
1005 | return -ENOMEM; |
1006 | } |
1007 | if (argc < 2) { |
1008 | semantic_error("Too few probe arguments.\n"); |
1009 | ret = -ERANGE; |
1010 | goto out; |
1011 | } |
1012 | |
1013 | /* Scan event and group name. */ |
1014 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
1015 | &pr, (float *)(void *)&tev->group, |
1016 | (float *)(void *)&tev->event); |
1017 | if (ret != 3) { |
1018 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1019 | ret = -EINVAL; |
1020 | goto out; |
1021 | } |
1022 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
1023 | |
1024 | tp->retprobe = (pr == 'r'); |
1025 | |
1026 | /* Scan function name and offset */ |
1027 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
1028 | &tp->offset); |
1029 | if (ret == 1) |
1030 | tp->offset = 0; |
1031 | |
1032 | tev->nargs = argc - 2; |
1033 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
1034 | if (tev->args == NULL) { |
1035 | ret = -ENOMEM; |
1036 | goto out; |
1037 | } |
1038 | for (i = 0; i < tev->nargs; i++) { |
1039 | p = strchr(argv[i + 2], '='); |
1040 | if (p) /* We don't need which register is assigned. */ |
1041 | *p++ = '\0'; |
1042 | else |
1043 | p = argv[i + 2]; |
1044 | tev->args[i].name = strdup(argv[i + 2]); |
1045 | /* TODO: parse regs and offset */ |
1046 | tev->args[i].value = strdup(p); |
1047 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { |
1048 | ret = -ENOMEM; |
1049 | goto out; |
1050 | } |
1051 | } |
1052 | ret = 0; |
1053 | out: |
1054 | argv_free(argv); |
1055 | return ret; |
1056 | } |
1057 | |
1058 | /* Compose only probe arg */ |
1059 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) |
1060 | { |
1061 | struct perf_probe_arg_field *field = pa->field; |
1062 | int ret; |
1063 | char *tmp = buf; |
1064 | |
1065 | if (pa->name && pa->var) |
1066 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); |
1067 | else |
1068 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); |
1069 | if (ret <= 0) |
1070 | goto error; |
1071 | tmp += ret; |
1072 | len -= ret; |
1073 | |
1074 | while (field) { |
1075 | if (field->name[0] == '[') |
1076 | ret = e_snprintf(tmp, len, "%s", field->name); |
1077 | else |
1078 | ret = e_snprintf(tmp, len, "%s%s", |
1079 | field->ref ? "->" : ".", field->name); |
1080 | if (ret <= 0) |
1081 | goto error; |
1082 | tmp += ret; |
1083 | len -= ret; |
1084 | field = field->next; |
1085 | } |
1086 | |
1087 | if (pa->type) { |
1088 | ret = e_snprintf(tmp, len, ":%s", pa->type); |
1089 | if (ret <= 0) |
1090 | goto error; |
1091 | tmp += ret; |
1092 | len -= ret; |
1093 | } |
1094 | |
1095 | return tmp - buf; |
1096 | error: |
1097 | pr_debug("Failed to synthesize perf probe argument: %s\n", |
1098 | strerror(-ret)); |
1099 | return ret; |
1100 | } |
1101 | |
1102 | /* Compose only probe point (not argument) */ |
1103 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) |
1104 | { |
1105 | char *buf, *tmp; |
1106 | char offs[32] = "", line[32] = "", file[32] = ""; |
1107 | int ret, len; |
1108 | |
1109 | buf = zalloc(MAX_CMDLEN); |
1110 | if (buf == NULL) { |
1111 | ret = -ENOMEM; |
1112 | goto error; |
1113 | } |
1114 | if (pp->offset) { |
1115 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
1116 | if (ret <= 0) |
1117 | goto error; |
1118 | } |
1119 | if (pp->line) { |
1120 | ret = e_snprintf(line, 32, ":%d", pp->line); |
1121 | if (ret <= 0) |
1122 | goto error; |
1123 | } |
1124 | if (pp->file) { |
1125 | tmp = pp->file; |
1126 | len = strlen(tmp); |
1127 | if (len > 30) { |
1128 | tmp = strchr(pp->file + len - 30, '/'); |
1129 | tmp = tmp ? tmp + 1 : pp->file + len - 30; |
1130 | } |
1131 | ret = e_snprintf(file, 32, "@%s", tmp); |
1132 | if (ret <= 0) |
1133 | goto error; |
1134 | } |
1135 | |
1136 | if (pp->function) |
1137 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
1138 | offs, pp->retprobe ? "%return" : "", line, |
1139 | file); |
1140 | else |
1141 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
1142 | if (ret <= 0) |
1143 | goto error; |
1144 | |
1145 | return buf; |
1146 | error: |
1147 | pr_debug("Failed to synthesize perf probe point: %s\n", |
1148 | strerror(-ret)); |
1149 | if (buf) |
1150 | free(buf); |
1151 | return NULL; |
1152 | } |
1153 | |
1154 | #if 0 |
1155 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) |
1156 | { |
1157 | char *buf; |
1158 | int i, len, ret; |
1159 | |
1160 | buf = synthesize_perf_probe_point(&pev->point); |
1161 | if (!buf) |
1162 | return NULL; |
1163 | |
1164 | len = strlen(buf); |
1165 | for (i = 0; i < pev->nargs; i++) { |
1166 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
1167 | pev->args[i].name); |
1168 | if (ret <= 0) { |
1169 | free(buf); |
1170 | return NULL; |
1171 | } |
1172 | len += ret; |
1173 | } |
1174 | |
1175 | return buf; |
1176 | } |
1177 | #endif |
1178 | |
1179 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
1180 | char **buf, size_t *buflen, |
1181 | int depth) |
1182 | { |
1183 | int ret; |
1184 | if (ref->next) { |
1185 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
1186 | buflen, depth + 1); |
1187 | if (depth < 0) |
1188 | goto out; |
1189 | } |
1190 | |
1191 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); |
1192 | if (ret < 0) |
1193 | depth = ret; |
1194 | else { |
1195 | *buf += ret; |
1196 | *buflen -= ret; |
1197 | } |
1198 | out: |
1199 | return depth; |
1200 | |
1201 | } |
1202 | |
1203 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
1204 | char *buf, size_t buflen) |
1205 | { |
1206 | struct probe_trace_arg_ref *ref = arg->ref; |
1207 | int ret, depth = 0; |
1208 | char *tmp = buf; |
1209 | |
1210 | /* Argument name or separator */ |
1211 | if (arg->name) |
1212 | ret = e_snprintf(buf, buflen, " %s=", arg->name); |
1213 | else |
1214 | ret = e_snprintf(buf, buflen, " "); |
1215 | if (ret < 0) |
1216 | return ret; |
1217 | buf += ret; |
1218 | buflen -= ret; |
1219 | |
1220 | /* Special case: @XXX */ |
1221 | if (arg->value[0] == '@' && arg->ref) |
1222 | ref = ref->next; |
1223 | |
1224 | /* Dereferencing arguments */ |
1225 | if (ref) { |
1226 | depth = __synthesize_probe_trace_arg_ref(ref, &buf, |
1227 | &buflen, 1); |
1228 | if (depth < 0) |
1229 | return depth; |
1230 | } |
1231 | |
1232 | /* Print argument value */ |
1233 | if (arg->value[0] == '@' && arg->ref) |
1234 | ret = e_snprintf(buf, buflen, "%s%+ld", arg->value, |
1235 | arg->ref->offset); |
1236 | else |
1237 | ret = e_snprintf(buf, buflen, "%s", arg->value); |
1238 | if (ret < 0) |
1239 | return ret; |
1240 | buf += ret; |
1241 | buflen -= ret; |
1242 | |
1243 | /* Closing */ |
1244 | while (depth--) { |
1245 | ret = e_snprintf(buf, buflen, ")"); |
1246 | if (ret < 0) |
1247 | return ret; |
1248 | buf += ret; |
1249 | buflen -= ret; |
1250 | } |
1251 | /* Print argument type */ |
1252 | if (arg->type) { |
1253 | ret = e_snprintf(buf, buflen, ":%s", arg->type); |
1254 | if (ret <= 0) |
1255 | return ret; |
1256 | buf += ret; |
1257 | } |
1258 | |
1259 | return buf - tmp; |
1260 | } |
1261 | |
1262 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
1263 | { |
1264 | struct probe_trace_point *tp = &tev->point; |
1265 | char *buf; |
1266 | int i, len, ret; |
1267 | |
1268 | buf = zalloc(MAX_CMDLEN); |
1269 | if (buf == NULL) |
1270 | return NULL; |
1271 | |
1272 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", |
1273 | tp->retprobe ? 'r' : 'p', |
1274 | tev->group, tev->event, |
1275 | tp->symbol, tp->offset); |
1276 | if (len <= 0) |
1277 | goto error; |
1278 | |
1279 | for (i = 0; i < tev->nargs; i++) { |
1280 | ret = synthesize_probe_trace_arg(&tev->args[i], buf + len, |
1281 | MAX_CMDLEN - len); |
1282 | if (ret <= 0) |
1283 | goto error; |
1284 | len += ret; |
1285 | } |
1286 | |
1287 | return buf; |
1288 | error: |
1289 | free(buf); |
1290 | return NULL; |
1291 | } |
1292 | |
1293 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
1294 | struct perf_probe_event *pev) |
1295 | { |
1296 | char buf[64] = ""; |
1297 | int i, ret; |
1298 | |
1299 | /* Convert event/group name */ |
1300 | pev->event = strdup(tev->event); |
1301 | pev->group = strdup(tev->group); |
1302 | if (pev->event == NULL || pev->group == NULL) |
1303 | return -ENOMEM; |
1304 | |
1305 | /* Convert trace_point to probe_point */ |
1306 | ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point); |
1307 | if (ret < 0) |
1308 | return ret; |
1309 | |
1310 | /* Convert trace_arg to probe_arg */ |
1311 | pev->nargs = tev->nargs; |
1312 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1313 | if (pev->args == NULL) |
1314 | return -ENOMEM; |
1315 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
1316 | if (tev->args[i].name) |
1317 | pev->args[i].name = strdup(tev->args[i].name); |
1318 | else { |
1319 | ret = synthesize_probe_trace_arg(&tev->args[i], |
1320 | buf, 64); |
1321 | pev->args[i].name = strdup(buf); |
1322 | } |
1323 | if (pev->args[i].name == NULL && ret >= 0) |
1324 | ret = -ENOMEM; |
1325 | } |
1326 | |
1327 | if (ret < 0) |
1328 | clear_perf_probe_event(pev); |
1329 | |
1330 | return ret; |
1331 | } |
1332 | |
1333 | void clear_perf_probe_event(struct perf_probe_event *pev) |
1334 | { |
1335 | struct perf_probe_point *pp = &pev->point; |
1336 | struct perf_probe_arg_field *field, *next; |
1337 | int i; |
1338 | |
1339 | if (pev->event) |
1340 | free(pev->event); |
1341 | if (pev->group) |
1342 | free(pev->group); |
1343 | if (pp->file) |
1344 | free(pp->file); |
1345 | if (pp->function) |
1346 | free(pp->function); |
1347 | if (pp->lazy_line) |
1348 | free(pp->lazy_line); |
1349 | for (i = 0; i < pev->nargs; i++) { |
1350 | if (pev->args[i].name) |
1351 | free(pev->args[i].name); |
1352 | if (pev->args[i].var) |
1353 | free(pev->args[i].var); |
1354 | if (pev->args[i].type) |
1355 | free(pev->args[i].type); |
1356 | field = pev->args[i].field; |
1357 | while (field) { |
1358 | next = field->next; |
1359 | if (field->name) |
1360 | free(field->name); |
1361 | free(field); |
1362 | field = next; |
1363 | } |
1364 | } |
1365 | if (pev->args) |
1366 | free(pev->args); |
1367 | memset(pev, 0, sizeof(*pev)); |
1368 | } |
1369 | |
1370 | static void clear_probe_trace_event(struct probe_trace_event *tev) |
1371 | { |
1372 | struct probe_trace_arg_ref *ref, *next; |
1373 | int i; |
1374 | |
1375 | if (tev->event) |
1376 | free(tev->event); |
1377 | if (tev->group) |
1378 | free(tev->group); |
1379 | if (tev->point.symbol) |
1380 | free(tev->point.symbol); |
1381 | for (i = 0; i < tev->nargs; i++) { |
1382 | if (tev->args[i].name) |
1383 | free(tev->args[i].name); |
1384 | if (tev->args[i].value) |
1385 | free(tev->args[i].value); |
1386 | if (tev->args[i].type) |
1387 | free(tev->args[i].type); |
1388 | ref = tev->args[i].ref; |
1389 | while (ref) { |
1390 | next = ref->next; |
1391 | free(ref); |
1392 | ref = next; |
1393 | } |
1394 | } |
1395 | if (tev->args) |
1396 | free(tev->args); |
1397 | memset(tev, 0, sizeof(*tev)); |
1398 | } |
1399 | |
1400 | static int open_kprobe_events(bool readwrite) |
1401 | { |
1402 | char buf[PATH_MAX]; |
1403 | const char *__debugfs; |
1404 | int ret; |
1405 | |
1406 | __debugfs = debugfs_find_mountpoint(); |
1407 | if (__debugfs == NULL) { |
1408 | pr_warning("Debugfs is not mounted.\n"); |
1409 | return -ENOENT; |
1410 | } |
1411 | |
1412 | ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs); |
1413 | if (ret >= 0) { |
1414 | pr_debug("Opening %s write=%d\n", buf, readwrite); |
1415 | if (readwrite && !probe_event_dry_run) |
1416 | ret = open(buf, O_RDWR, O_APPEND); |
1417 | else |
1418 | ret = open(buf, O_RDONLY, 0); |
1419 | } |
1420 | |
1421 | if (ret < 0) { |
1422 | if (errno == ENOENT) |
1423 | pr_warning("kprobe_events file does not exist - please" |
1424 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); |
1425 | else |
1426 | pr_warning("Failed to open kprobe_events file: %s\n", |
1427 | strerror(errno)); |
1428 | } |
1429 | return ret; |
1430 | } |
1431 | |
1432 | /* Get raw string list of current kprobe_events */ |
1433 | static struct strlist *get_probe_trace_command_rawlist(int fd) |
1434 | { |
1435 | int ret, idx; |
1436 | FILE *fp; |
1437 | char buf[MAX_CMDLEN]; |
1438 | char *p; |
1439 | struct strlist *sl; |
1440 | |
1441 | sl = strlist__new(true, NULL); |
1442 | |
1443 | fp = fdopen(dup(fd), "r"); |
1444 | while (!feof(fp)) { |
1445 | p = fgets(buf, MAX_CMDLEN, fp); |
1446 | if (!p) |
1447 | break; |
1448 | |
1449 | idx = strlen(p) - 1; |
1450 | if (p[idx] == '\n') |
1451 | p[idx] = '\0'; |
1452 | ret = strlist__add(sl, buf); |
1453 | if (ret < 0) { |
1454 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); |
1455 | strlist__delete(sl); |
1456 | return NULL; |
1457 | } |
1458 | } |
1459 | fclose(fp); |
1460 | |
1461 | return sl; |
1462 | } |
1463 | |
1464 | /* Show an event */ |
1465 | static int show_perf_probe_event(struct perf_probe_event *pev) |
1466 | { |
1467 | int i, ret; |
1468 | char buf[128]; |
1469 | char *place; |
1470 | |
1471 | /* Synthesize only event probe point */ |
1472 | place = synthesize_perf_probe_point(&pev->point); |
1473 | if (!place) |
1474 | return -EINVAL; |
1475 | |
1476 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); |
1477 | if (ret < 0) |
1478 | return ret; |
1479 | |
1480 | printf(" %-20s (on %s", buf, place); |
1481 | |
1482 | if (pev->nargs > 0) { |
1483 | printf(" with"); |
1484 | for (i = 0; i < pev->nargs; i++) { |
1485 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1486 | buf, 128); |
1487 | if (ret < 0) |
1488 | break; |
1489 | printf(" %s", buf); |
1490 | } |
1491 | } |
1492 | printf(")\n"); |
1493 | free(place); |
1494 | return ret; |
1495 | } |
1496 | |
1497 | /* List up current perf-probe events */ |
1498 | int show_perf_probe_events(void) |
1499 | { |
1500 | int fd, ret; |
1501 | struct probe_trace_event tev; |
1502 | struct perf_probe_event pev; |
1503 | struct strlist *rawlist; |
1504 | struct str_node *ent; |
1505 | |
1506 | setup_pager(); |
1507 | ret = init_vmlinux(); |
1508 | if (ret < 0) |
1509 | return ret; |
1510 | |
1511 | memset(&tev, 0, sizeof(tev)); |
1512 | memset(&pev, 0, sizeof(pev)); |
1513 | |
1514 | fd = open_kprobe_events(false); |
1515 | if (fd < 0) |
1516 | return fd; |
1517 | |
1518 | rawlist = get_probe_trace_command_rawlist(fd); |
1519 | close(fd); |
1520 | if (!rawlist) |
1521 | return -ENOENT; |
1522 | |
1523 | strlist__for_each(ent, rawlist) { |
1524 | ret = parse_probe_trace_command(ent->s, &tev); |
1525 | if (ret >= 0) { |
1526 | ret = convert_to_perf_probe_event(&tev, &pev); |
1527 | if (ret >= 0) |
1528 | ret = show_perf_probe_event(&pev); |
1529 | } |
1530 | clear_perf_probe_event(&pev); |
1531 | clear_probe_trace_event(&tev); |
1532 | if (ret < 0) |
1533 | break; |
1534 | } |
1535 | strlist__delete(rawlist); |
1536 | |
1537 | return ret; |
1538 | } |
1539 | |
1540 | /* Get current perf-probe event names */ |
1541 | static struct strlist *get_probe_trace_event_names(int fd, bool include_group) |
1542 | { |
1543 | char buf[128]; |
1544 | struct strlist *sl, *rawlist; |
1545 | struct str_node *ent; |
1546 | struct probe_trace_event tev; |
1547 | int ret = 0; |
1548 | |
1549 | memset(&tev, 0, sizeof(tev)); |
1550 | rawlist = get_probe_trace_command_rawlist(fd); |
1551 | sl = strlist__new(true, NULL); |
1552 | strlist__for_each(ent, rawlist) { |
1553 | ret = parse_probe_trace_command(ent->s, &tev); |
1554 | if (ret < 0) |
1555 | break; |
1556 | if (include_group) { |
1557 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1558 | tev.event); |
1559 | if (ret >= 0) |
1560 | ret = strlist__add(sl, buf); |
1561 | } else |
1562 | ret = strlist__add(sl, tev.event); |
1563 | clear_probe_trace_event(&tev); |
1564 | if (ret < 0) |
1565 | break; |
1566 | } |
1567 | strlist__delete(rawlist); |
1568 | |
1569 | if (ret < 0) { |
1570 | strlist__delete(sl); |
1571 | return NULL; |
1572 | } |
1573 | return sl; |
1574 | } |
1575 | |
1576 | static int write_probe_trace_event(int fd, struct probe_trace_event *tev) |
1577 | { |
1578 | int ret = 0; |
1579 | char *buf = synthesize_probe_trace_command(tev); |
1580 | |
1581 | if (!buf) { |
1582 | pr_debug("Failed to synthesize probe trace event.\n"); |
1583 | return -EINVAL; |
1584 | } |
1585 | |
1586 | pr_debug("Writing event: %s\n", buf); |
1587 | if (!probe_event_dry_run) { |
1588 | ret = write(fd, buf, strlen(buf)); |
1589 | if (ret <= 0) |
1590 | pr_warning("Failed to write event: %s\n", |
1591 | strerror(errno)); |
1592 | } |
1593 | free(buf); |
1594 | return ret; |
1595 | } |
1596 | |
1597 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1598 | struct strlist *namelist, bool allow_suffix) |
1599 | { |
1600 | int i, ret; |
1601 | |
1602 | /* Try no suffix */ |
1603 | ret = e_snprintf(buf, len, "%s", base); |
1604 | if (ret < 0) { |
1605 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); |
1606 | return ret; |
1607 | } |
1608 | if (!strlist__has_entry(namelist, buf)) |
1609 | return 0; |
1610 | |
1611 | if (!allow_suffix) { |
1612 | pr_warning("Error: event \"%s\" already exists. " |
1613 | "(Use -f to force duplicates.)\n", base); |
1614 | return -EEXIST; |
1615 | } |
1616 | |
1617 | /* Try to add suffix */ |
1618 | for (i = 1; i < MAX_EVENT_INDEX; i++) { |
1619 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
1620 | if (ret < 0) { |
1621 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); |
1622 | return ret; |
1623 | } |
1624 | if (!strlist__has_entry(namelist, buf)) |
1625 | break; |
1626 | } |
1627 | if (i == MAX_EVENT_INDEX) { |
1628 | pr_warning("Too many events are on the same function.\n"); |
1629 | ret = -ERANGE; |
1630 | } |
1631 | |
1632 | return ret; |
1633 | } |
1634 | |
1635 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
1636 | struct probe_trace_event *tevs, |
1637 | int ntevs, bool allow_suffix) |
1638 | { |
1639 | int i, fd, ret; |
1640 | struct probe_trace_event *tev = NULL; |
1641 | char buf[64]; |
1642 | const char *event, *group; |
1643 | struct strlist *namelist; |
1644 | |
1645 | fd = open_kprobe_events(true); |
1646 | if (fd < 0) |
1647 | return fd; |
1648 | /* Get current event names */ |
1649 | namelist = get_probe_trace_event_names(fd, false); |
1650 | if (!namelist) { |
1651 | pr_debug("Failed to get current event list.\n"); |
1652 | return -EIO; |
1653 | } |
1654 | |
1655 | ret = 0; |
1656 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
1657 | for (i = 0; i < ntevs; i++) { |
1658 | tev = &tevs[i]; |
1659 | if (pev->event) |
1660 | event = pev->event; |
1661 | else |
1662 | if (pev->point.function) |
1663 | event = pev->point.function; |
1664 | else |
1665 | event = tev->point.symbol; |
1666 | if (pev->group) |
1667 | group = pev->group; |
1668 | else |
1669 | group = PERFPROBE_GROUP; |
1670 | |
1671 | /* Get an unused new event name */ |
1672 | ret = get_new_event_name(buf, 64, event, |
1673 | namelist, allow_suffix); |
1674 | if (ret < 0) |
1675 | break; |
1676 | event = buf; |
1677 | |
1678 | tev->event = strdup(event); |
1679 | tev->group = strdup(group); |
1680 | if (tev->event == NULL || tev->group == NULL) { |
1681 | ret = -ENOMEM; |
1682 | break; |
1683 | } |
1684 | ret = write_probe_trace_event(fd, tev); |
1685 | if (ret < 0) |
1686 | break; |
1687 | /* Add added event name to namelist */ |
1688 | strlist__add(namelist, event); |
1689 | |
1690 | /* Trick here - save current event/group */ |
1691 | event = pev->event; |
1692 | group = pev->group; |
1693 | pev->event = tev->event; |
1694 | pev->group = tev->group; |
1695 | show_perf_probe_event(pev); |
1696 | /* Trick here - restore current event/group */ |
1697 | pev->event = (char *)event; |
1698 | pev->group = (char *)group; |
1699 | |
1700 | /* |
1701 | * Probes after the first probe which comes from same |
1702 | * user input are always allowed to add suffix, because |
1703 | * there might be several addresses corresponding to |
1704 | * one code line. |
1705 | */ |
1706 | allow_suffix = true; |
1707 | } |
1708 | |
1709 | if (ret >= 0) { |
1710 | /* Show how to use the event. */ |
1711 | printf("\nYou can now use it on all perf tools, such as:\n\n"); |
1712 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, |
1713 | tev->event); |
1714 | } |
1715 | |
1716 | strlist__delete(namelist); |
1717 | close(fd); |
1718 | return ret; |
1719 | } |
1720 | |
1721 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
1722 | struct probe_trace_event **tevs, |
1723 | int max_tevs, const char *module) |
1724 | { |
1725 | struct symbol *sym; |
1726 | int ret = 0, i; |
1727 | struct probe_trace_event *tev; |
1728 | |
1729 | /* Convert perf_probe_event with debuginfo */ |
1730 | ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module); |
1731 | if (ret != 0) |
1732 | return ret; |
1733 | |
1734 | /* Allocate trace event buffer */ |
1735 | tev = *tevs = zalloc(sizeof(struct probe_trace_event)); |
1736 | if (tev == NULL) |
1737 | return -ENOMEM; |
1738 | |
1739 | /* Copy parameters */ |
1740 | tev->point.symbol = strdup(pev->point.function); |
1741 | if (tev->point.symbol == NULL) { |
1742 | ret = -ENOMEM; |
1743 | goto error; |
1744 | } |
1745 | tev->point.offset = pev->point.offset; |
1746 | tev->point.retprobe = pev->point.retprobe; |
1747 | tev->nargs = pev->nargs; |
1748 | if (tev->nargs) { |
1749 | tev->args = zalloc(sizeof(struct probe_trace_arg) |
1750 | * tev->nargs); |
1751 | if (tev->args == NULL) { |
1752 | ret = -ENOMEM; |
1753 | goto error; |
1754 | } |
1755 | for (i = 0; i < tev->nargs; i++) { |
1756 | if (pev->args[i].name) { |
1757 | tev->args[i].name = strdup(pev->args[i].name); |
1758 | if (tev->args[i].name == NULL) { |
1759 | ret = -ENOMEM; |
1760 | goto error; |
1761 | } |
1762 | } |
1763 | tev->args[i].value = strdup(pev->args[i].var); |
1764 | if (tev->args[i].value == NULL) { |
1765 | ret = -ENOMEM; |
1766 | goto error; |
1767 | } |
1768 | if (pev->args[i].type) { |
1769 | tev->args[i].type = strdup(pev->args[i].type); |
1770 | if (tev->args[i].type == NULL) { |
1771 | ret = -ENOMEM; |
1772 | goto error; |
1773 | } |
1774 | } |
1775 | } |
1776 | } |
1777 | |
1778 | /* Currently just checking function name from symbol map */ |
1779 | sym = __find_kernel_function_by_name(tev->point.symbol, NULL); |
1780 | if (!sym) { |
1781 | pr_warning("Kernel symbol \'%s\' not found.\n", |
1782 | tev->point.symbol); |
1783 | ret = -ENOENT; |
1784 | goto error; |
1785 | } |
1786 | |
1787 | return 1; |
1788 | error: |
1789 | clear_probe_trace_event(tev); |
1790 | free(tev); |
1791 | *tevs = NULL; |
1792 | return ret; |
1793 | } |
1794 | |
1795 | struct __event_package { |
1796 | struct perf_probe_event *pev; |
1797 | struct probe_trace_event *tevs; |
1798 | int ntevs; |
1799 | }; |
1800 | |
1801 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
1802 | int max_tevs, const char *module, bool force_add) |
1803 | { |
1804 | int i, j, ret; |
1805 | struct __event_package *pkgs; |
1806 | |
1807 | pkgs = zalloc(sizeof(struct __event_package) * npevs); |
1808 | if (pkgs == NULL) |
1809 | return -ENOMEM; |
1810 | |
1811 | /* Init vmlinux path */ |
1812 | ret = init_vmlinux(); |
1813 | if (ret < 0) { |
1814 | free(pkgs); |
1815 | return ret; |
1816 | } |
1817 | |
1818 | /* Loop 1: convert all events */ |
1819 | for (i = 0; i < npevs; i++) { |
1820 | pkgs[i].pev = &pevs[i]; |
1821 | /* Convert with or without debuginfo */ |
1822 | ret = convert_to_probe_trace_events(pkgs[i].pev, |
1823 | &pkgs[i].tevs, |
1824 | max_tevs, |
1825 | module); |
1826 | if (ret < 0) |
1827 | goto end; |
1828 | pkgs[i].ntevs = ret; |
1829 | } |
1830 | |
1831 | /* Loop 2: add all events */ |
1832 | for (i = 0; i < npevs; i++) { |
1833 | ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs, |
1834 | pkgs[i].ntevs, force_add); |
1835 | if (ret < 0) |
1836 | break; |
1837 | } |
1838 | end: |
1839 | /* Loop 3: cleanup and free trace events */ |
1840 | for (i = 0; i < npevs; i++) { |
1841 | for (j = 0; j < pkgs[i].ntevs; j++) |
1842 | clear_probe_trace_event(&pkgs[i].tevs[j]); |
1843 | free(pkgs[i].tevs); |
1844 | } |
1845 | free(pkgs); |
1846 | |
1847 | return ret; |
1848 | } |
1849 | |
1850 | static int __del_trace_probe_event(int fd, struct str_node *ent) |
1851 | { |
1852 | char *p; |
1853 | char buf[128]; |
1854 | int ret; |
1855 | |
1856 | /* Convert from perf-probe event to trace-probe event */ |
1857 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1858 | if (ret < 0) |
1859 | goto error; |
1860 | |
1861 | p = strchr(buf + 2, ':'); |
1862 | if (!p) { |
1863 | pr_debug("Internal error: %s should have ':' but not.\n", |
1864 | ent->s); |
1865 | ret = -ENOTSUP; |
1866 | goto error; |
1867 | } |
1868 | *p = '/'; |
1869 | |
1870 | pr_debug("Writing event: %s\n", buf); |
1871 | ret = write(fd, buf, strlen(buf)); |
1872 | if (ret < 0) |
1873 | goto error; |
1874 | |
1875 | printf("Remove event: %s\n", ent->s); |
1876 | return 0; |
1877 | error: |
1878 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); |
1879 | return ret; |
1880 | } |
1881 | |
1882 | static int del_trace_probe_event(int fd, const char *group, |
1883 | const char *event, struct strlist *namelist) |
1884 | { |
1885 | char buf[128]; |
1886 | struct str_node *ent, *n; |
1887 | int found = 0, ret = 0; |
1888 | |
1889 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1890 | if (ret < 0) { |
1891 | pr_err("Failed to copy event.\n"); |
1892 | return ret; |
1893 | } |
1894 | |
1895 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1896 | strlist__for_each_safe(ent, n, namelist) |
1897 | if (strglobmatch(ent->s, buf)) { |
1898 | found++; |
1899 | ret = __del_trace_probe_event(fd, ent); |
1900 | if (ret < 0) |
1901 | break; |
1902 | strlist__remove(namelist, ent); |
1903 | } |
1904 | } else { |
1905 | ent = strlist__find(namelist, buf); |
1906 | if (ent) { |
1907 | found++; |
1908 | ret = __del_trace_probe_event(fd, ent); |
1909 | if (ret >= 0) |
1910 | strlist__remove(namelist, ent); |
1911 | } |
1912 | } |
1913 | if (found == 0 && ret >= 0) |
1914 | pr_info("Info: Event \"%s\" does not exist.\n", buf); |
1915 | |
1916 | return ret; |
1917 | } |
1918 | |
1919 | int del_perf_probe_events(struct strlist *dellist) |
1920 | { |
1921 | int fd, ret = 0; |
1922 | const char *group, *event; |
1923 | char *p, *str; |
1924 | struct str_node *ent; |
1925 | struct strlist *namelist; |
1926 | |
1927 | fd = open_kprobe_events(true); |
1928 | if (fd < 0) |
1929 | return fd; |
1930 | |
1931 | /* Get current event names */ |
1932 | namelist = get_probe_trace_event_names(fd, true); |
1933 | if (namelist == NULL) |
1934 | return -EINVAL; |
1935 | |
1936 | strlist__for_each(ent, dellist) { |
1937 | str = strdup(ent->s); |
1938 | if (str == NULL) { |
1939 | ret = -ENOMEM; |
1940 | break; |
1941 | } |
1942 | pr_debug("Parsing: %s\n", str); |
1943 | p = strchr(str, ':'); |
1944 | if (p) { |
1945 | group = str; |
1946 | *p = '\0'; |
1947 | event = p + 1; |
1948 | } else { |
1949 | group = "*"; |
1950 | event = str; |
1951 | } |
1952 | pr_debug("Group: %s, Event: %s\n", group, event); |
1953 | ret = del_trace_probe_event(fd, group, event, namelist); |
1954 | free(str); |
1955 | if (ret < 0) |
1956 | break; |
1957 | } |
1958 | strlist__delete(namelist); |
1959 | close(fd); |
1960 | |
1961 | return ret; |
1962 | } |
1963 | /* TODO: don't use a global variable for filter ... */ |
1964 | static struct strfilter *available_func_filter; |
1965 | |
1966 | /* |
1967 | * If a symbol corresponds to a function with global binding and |
1968 | * matches filter return 0. For all others return 1. |
1969 | */ |
1970 | static int filter_available_functions(struct map *map __unused, |
1971 | struct symbol *sym) |
1972 | { |
1973 | if (sym->binding == STB_GLOBAL && |
1974 | strfilter__compare(available_func_filter, sym->name)) |
1975 | return 0; |
1976 | return 1; |
1977 | } |
1978 | |
1979 | int show_available_funcs(const char *module, struct strfilter *_filter) |
1980 | { |
1981 | struct map *map; |
1982 | int ret; |
1983 | |
1984 | setup_pager(); |
1985 | |
1986 | ret = init_vmlinux(); |
1987 | if (ret < 0) |
1988 | return ret; |
1989 | |
1990 | map = kernel_get_module_map(module); |
1991 | if (!map) { |
1992 | pr_err("Failed to find %s map.\n", (module) ? : "kernel"); |
1993 | return -EINVAL; |
1994 | } |
1995 | available_func_filter = _filter; |
1996 | if (map__load(map, filter_available_functions)) { |
1997 | pr_err("Failed to load map.\n"); |
1998 | return -EINVAL; |
1999 | } |
2000 | if (!dso__sorted_by_name(map->dso, map->type)) |
2001 | dso__sort_by_name(map->dso, map->type); |
2002 | |
2003 | dso__fprintf_symbols_by_name(map->dso, map->type, stdout); |
2004 | return 0; |
2005 | } |
2006 |
Branches:
ben-wpan
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9