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50656eec MH |
1 | /* |
2 | * probe-event.c : perf-probe definition to kprobe_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> | |
4de189fe MH |
32 | #include <stdarg.h> |
33 | #include <limits.h> | |
50656eec MH |
34 | |
35 | #undef _GNU_SOURCE | |
31facc5f | 36 | #include "util.h" |
50656eec | 37 | #include "event.h" |
e1c01d61 | 38 | #include "string.h" |
4de189fe | 39 | #include "strlist.h" |
50656eec | 40 | #include "debug.h" |
72041334 | 41 | #include "cache.h" |
631c9def | 42 | #include "color.h" |
e0faa8d3 MH |
43 | #include "symbol.h" |
44 | #include "thread.h" | |
4b4da7f7 MH |
45 | #include "trace-event.h" /* For __unused */ |
46 | #include "parse-events.h" /* For debugfs_path */ | |
50656eec | 47 | #include "probe-event.h" |
4235b045 | 48 | #include "probe-finder.h" |
50656eec MH |
49 | |
50 | #define MAX_CMDLEN 256 | |
51 | #define MAX_PROBE_ARGS 128 | |
52 | #define PERFPROBE_GROUP "probe" | |
53 | ||
f4d7da49 MH |
54 | bool probe_event_dry_run; /* Dry run flag */ |
55 | ||
146a1439 | 56 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 57 | |
4de189fe | 58 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
59 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
60 | __attribute__((format(printf, 3, 4))); | |
61 | ||
4de189fe MH |
62 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
63 | { | |
64 | int ret; | |
65 | va_list ap; | |
66 | va_start(ap, format); | |
67 | ret = vsnprintf(str, size, format, ap); | |
68 | va_end(ap); | |
69 | if (ret >= (int)size) | |
70 | ret = -E2BIG; | |
71 | return ret; | |
72 | } | |
73 | ||
4b4da7f7 | 74 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp); |
e0faa8d3 MH |
75 | static struct map_groups kmap_groups; |
76 | static struct map *kmaps[MAP__NR_TYPES]; | |
77 | ||
4b4da7f7 | 78 | /* Initialize symbol maps and path of vmlinux */ |
146a1439 | 79 | static int init_vmlinux(void) |
e0faa8d3 | 80 | { |
146a1439 MH |
81 | int ret; |
82 | ||
e0faa8d3 MH |
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); | |
146a1439 MH |
88 | ret = symbol__init(); |
89 | if (ret < 0) { | |
90 | pr_debug("Failed to init symbol map.\n"); | |
91 | goto out; | |
92 | } | |
e0faa8d3 MH |
93 | |
94 | map_groups__init(&kmap_groups); | |
146a1439 MH |
95 | ret = map_groups__create_kernel_maps(&kmap_groups, kmaps); |
96 | if (ret < 0) | |
97 | pr_debug("Failed to create kernel maps.\n"); | |
98 | ||
99 | out: | |
100 | if (ret < 0) | |
101 | pr_warning("Failed to init vmlinux path.\n"); | |
102 | return ret; | |
e0faa8d3 MH |
103 | } |
104 | ||
4b4da7f7 | 105 | #ifdef DWARF_SUPPORT |
e0faa8d3 MH |
106 | static int open_vmlinux(void) |
107 | { | |
108 | if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) { | |
109 | pr_debug("Failed to load kernel map.\n"); | |
110 | return -EINVAL; | |
111 | } | |
112 | pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name); | |
113 | return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY); | |
114 | } | |
4b4da7f7 | 115 | |
146a1439 MH |
116 | /* Convert trace point to probe point with debuginfo */ |
117 | static int convert_to_perf_probe_point(struct kprobe_trace_point *tp, | |
118 | struct perf_probe_point *pp) | |
4b4da7f7 MH |
119 | { |
120 | struct symbol *sym; | |
146a1439 | 121 | int fd, ret = -ENOENT; |
4b4da7f7 MH |
122 | |
123 | sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION], | |
124 | tp->symbol, NULL); | |
125 | if (sym) { | |
126 | fd = open_vmlinux(); | |
146a1439 MH |
127 | if (fd >= 0) { |
128 | ret = find_perf_probe_point(fd, | |
129 | sym->start + tp->offset, pp); | |
130 | close(fd); | |
131 | } | |
4b4da7f7 MH |
132 | } |
133 | if (ret <= 0) { | |
146a1439 MH |
134 | pr_debug("Failed to find corresponding probes from " |
135 | "debuginfo. Use kprobe event information.\n"); | |
4b4da7f7 MH |
136 | pp->function = xstrdup(tp->symbol); |
137 | pp->offset = tp->offset; | |
138 | } | |
139 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
140 | |
141 | return 0; | |
4b4da7f7 MH |
142 | } |
143 | ||
144 | /* Try to find perf_probe_event with debuginfo */ | |
145 | static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, | |
146 | struct kprobe_trace_event **tevs) | |
147 | { | |
148 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
149 | int fd, ntevs; | |
150 | ||
151 | fd = open_vmlinux(); | |
152 | if (fd < 0) { | |
146a1439 MH |
153 | if (need_dwarf) { |
154 | pr_warning("Failed to open debuginfo file.\n"); | |
155 | return fd; | |
156 | } | |
4b4da7f7 MH |
157 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* Searching trace events corresponding to probe event */ | |
162 | ntevs = find_kprobe_trace_events(fd, pev, tevs); | |
163 | close(fd); | |
164 | ||
146a1439 MH |
165 | if (ntevs > 0) { /* Succeeded to find trace events */ |
166 | pr_debug("find %d kprobe_trace_events.\n", ntevs); | |
4b4da7f7 | 167 | return ntevs; |
146a1439 | 168 | } |
4b4da7f7 | 169 | |
146a1439 MH |
170 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
171 | pr_warning("Probe point '%s' not found.\n", | |
172 | synthesize_perf_probe_point(&pev->point)); | |
173 | return -ENOENT; | |
174 | } | |
175 | /* Error path : ntevs < 0 */ | |
4b4da7f7 | 176 | if (need_dwarf) { |
b55a87ad | 177 | if (ntevs == -EBADF) |
4b4da7f7 MH |
178 | pr_warning("No dwarf info found in the vmlinux - " |
179 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
146a1439 | 180 | return ntevs; |
4b4da7f7 MH |
181 | } |
182 | pr_debug("An error occurred in debuginfo analysis." | |
183 | " Try to use symbols.\n"); | |
184 | return 0; | |
4b4da7f7 MH |
185 | } |
186 | ||
187 | #define LINEBUF_SIZE 256 | |
188 | #define NR_ADDITIONAL_LINES 2 | |
189 | ||
146a1439 | 190 | static int show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num) |
4b4da7f7 MH |
191 | { |
192 | char buf[LINEBUF_SIZE]; | |
193 | const char *color = PERF_COLOR_BLUE; | |
194 | ||
195 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
196 | goto error; | |
197 | if (!skip) { | |
198 | if (show_num) | |
199 | fprintf(stdout, "%7u %s", l, buf); | |
200 | else | |
201 | color_fprintf(stdout, color, " %s", buf); | |
202 | } | |
203 | ||
204 | while (strlen(buf) == LINEBUF_SIZE - 1 && | |
205 | buf[LINEBUF_SIZE - 2] != '\n') { | |
206 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
207 | goto error; | |
208 | if (!skip) { | |
209 | if (show_num) | |
210 | fprintf(stdout, "%s", buf); | |
211 | else | |
212 | color_fprintf(stdout, color, "%s", buf); | |
213 | } | |
214 | } | |
146a1439 MH |
215 | |
216 | return 0; | |
4b4da7f7 MH |
217 | error: |
218 | if (feof(fp)) | |
146a1439 | 219 | pr_warning("Source file is shorter than expected.\n"); |
4b4da7f7 | 220 | else |
146a1439 MH |
221 | pr_warning("File read error: %s\n", strerror(errno)); |
222 | ||
223 | return -1; | |
4b4da7f7 MH |
224 | } |
225 | ||
226 | /* | |
227 | * Show line-range always requires debuginfo to find source file and | |
228 | * line number. | |
229 | */ | |
146a1439 | 230 | int show_line_range(struct line_range *lr) |
4b4da7f7 MH |
231 | { |
232 | unsigned int l = 1; | |
233 | struct line_node *ln; | |
234 | FILE *fp; | |
235 | int fd, ret; | |
236 | ||
237 | /* Search a line range */ | |
146a1439 MH |
238 | ret = init_vmlinux(); |
239 | if (ret < 0) | |
240 | return ret; | |
241 | ||
4b4da7f7 | 242 | fd = open_vmlinux(); |
146a1439 MH |
243 | if (fd < 0) { |
244 | pr_warning("Failed to open debuginfo file.\n"); | |
245 | return fd; | |
246 | } | |
247 | ||
4b4da7f7 | 248 | ret = find_line_range(fd, lr); |
4b4da7f7 | 249 | close(fd); |
146a1439 MH |
250 | if (ret == 0) { |
251 | pr_warning("Specified source line is not found.\n"); | |
252 | return -ENOENT; | |
253 | } else if (ret < 0) { | |
254 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); | |
255 | return ret; | |
256 | } | |
4b4da7f7 MH |
257 | |
258 | setup_pager(); | |
259 | ||
260 | if (lr->function) | |
261 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
262 | lr->start - lr->offset); | |
263 | else | |
264 | fprintf(stdout, "<%s:%d>\n", lr->file, lr->start); | |
265 | ||
266 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
267 | if (fp == NULL) { |
268 | pr_warning("Failed to open %s: %s\n", lr->path, | |
269 | strerror(errno)); | |
270 | return -errno; | |
271 | } | |
4b4da7f7 | 272 | /* Skip to starting line number */ |
146a1439 MH |
273 | while (l < lr->start && ret >= 0) |
274 | ret = show_one_line(fp, l++, true, false); | |
275 | if (ret < 0) | |
276 | goto end; | |
4b4da7f7 MH |
277 | |
278 | list_for_each_entry(ln, &lr->line_list, list) { | |
146a1439 MH |
279 | while (ln->line > l && ret >= 0) |
280 | ret = show_one_line(fp, (l++) - lr->offset, | |
281 | false, false); | |
282 | if (ret >= 0) | |
283 | ret = show_one_line(fp, (l++) - lr->offset, | |
284 | false, true); | |
285 | if (ret < 0) | |
286 | goto end; | |
4b4da7f7 MH |
287 | } |
288 | ||
289 | if (lr->end == INT_MAX) | |
290 | lr->end = l + NR_ADDITIONAL_LINES; | |
146a1439 MH |
291 | while (l < lr->end && !feof(fp) && ret >= 0) |
292 | ret = show_one_line(fp, (l++) - lr->offset, false, false); | |
293 | end: | |
4b4da7f7 | 294 | fclose(fp); |
146a1439 | 295 | return ret; |
4b4da7f7 MH |
296 | } |
297 | ||
298 | #else /* !DWARF_SUPPORT */ | |
299 | ||
146a1439 | 300 | static int convert_to_perf_probe_point(struct kprobe_trace_point *tp, |
4b4da7f7 MH |
301 | struct perf_probe_point *pp) |
302 | { | |
303 | pp->function = xstrdup(tp->symbol); | |
304 | pp->offset = tp->offset; | |
305 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
306 | |
307 | return 0; | |
4b4da7f7 MH |
308 | } |
309 | ||
310 | static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, | |
311 | struct kprobe_trace_event **tevs __unused) | |
312 | { | |
146a1439 MH |
313 | if (perf_probe_event_need_dwarf(pev)) { |
314 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
315 | return -ENOSYS; | |
316 | } | |
4b4da7f7 MH |
317 | return 0; |
318 | } | |
319 | ||
146a1439 | 320 | int show_line_range(struct line_range *lr __unused) |
4b4da7f7 | 321 | { |
146a1439 MH |
322 | pr_warning("Debuginfo-analysis is not supported.\n"); |
323 | return -ENOSYS; | |
4b4da7f7 MH |
324 | } |
325 | ||
e0faa8d3 MH |
326 | #endif |
327 | ||
146a1439 | 328 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def MH |
329 | { |
330 | const char *ptr; | |
331 | char *tmp; | |
332 | /* | |
333 | * <Syntax> | |
334 | * SRC:SLN[+NUM|-ELN] | |
335 | * FUNC[:SLN[+NUM|-ELN]] | |
336 | */ | |
337 | ptr = strchr(arg, ':'); | |
338 | if (ptr) { | |
339 | lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0); | |
340 | if (*tmp == '+') | |
341 | lr->end = lr->start + (unsigned int)strtoul(tmp + 1, | |
342 | &tmp, 0); | |
343 | else if (*tmp == '-') | |
344 | lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0); | |
345 | else | |
346 | lr->end = 0; | |
347 | pr_debug("Line range is %u to %u\n", lr->start, lr->end); | |
146a1439 | 348 | if (lr->end && lr->start > lr->end) { |
631c9def | 349 | semantic_error("Start line must be smaller" |
146a1439 MH |
350 | " than end line.\n"); |
351 | return -EINVAL; | |
352 | } | |
353 | if (*tmp != '\0') { | |
354 | semantic_error("Tailing with invalid character '%d'.\n", | |
631c9def | 355 | *tmp); |
146a1439 MH |
356 | return -EINVAL; |
357 | } | |
31facc5f | 358 | tmp = xstrndup(arg, (ptr - arg)); |
631c9def | 359 | } else |
31facc5f | 360 | tmp = xstrdup(arg); |
631c9def MH |
361 | |
362 | if (strchr(tmp, '.')) | |
363 | lr->file = tmp; | |
364 | else | |
365 | lr->function = tmp; | |
146a1439 MH |
366 | |
367 | return 0; | |
631c9def MH |
368 | } |
369 | ||
b7702a21 MH |
370 | /* Check the name is good for event/group */ |
371 | static bool check_event_name(const char *name) | |
372 | { | |
373 | if (!isalpha(*name) && *name != '_') | |
374 | return false; | |
375 | while (*++name != '\0') { | |
376 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
377 | return false; | |
378 | } | |
379 | return true; | |
380 | } | |
381 | ||
50656eec | 382 | /* Parse probepoint definition. */ |
146a1439 | 383 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 384 | { |
4235b045 | 385 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
386 | char *ptr, *tmp; |
387 | char c, nc = 0; | |
388 | /* | |
389 | * <Syntax> | |
2a9c8c36 MH |
390 | * perf probe [EVENT=]SRC[:LN|;PTN] |
391 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
392 | * |
393 | * TODO:Group name support | |
50656eec MH |
394 | */ |
395 | ||
2a9c8c36 MH |
396 | ptr = strpbrk(arg, ";=@+%"); |
397 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
398 | *ptr = '\0'; |
399 | tmp = ptr + 1; | |
146a1439 MH |
400 | if (strchr(arg, ':')) { |
401 | semantic_error("Group name is not supported yet.\n"); | |
402 | return -ENOTSUP; | |
403 | } | |
404 | if (!check_event_name(arg)) { | |
b7702a21 | 405 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
406 | "follow C symbol-naming rule.\n", arg); |
407 | return -EINVAL; | |
408 | } | |
4235b045 MH |
409 | pev->event = xstrdup(arg); |
410 | pev->group = NULL; | |
af663d75 MH |
411 | arg = tmp; |
412 | } | |
413 | ||
2a9c8c36 | 414 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
415 | if (ptr) { |
416 | nc = *ptr; | |
417 | *ptr++ = '\0'; | |
418 | } | |
419 | ||
420 | /* Check arg is function or file and copy it */ | |
421 | if (strchr(arg, '.')) /* File */ | |
31facc5f | 422 | pp->file = xstrdup(arg); |
50656eec | 423 | else /* Function */ |
31facc5f | 424 | pp->function = xstrdup(arg); |
50656eec MH |
425 | |
426 | /* Parse other options */ | |
427 | while (ptr) { | |
428 | arg = ptr; | |
429 | c = nc; | |
2a9c8c36 | 430 | if (c == ';') { /* Lazy pattern must be the last part */ |
31facc5f | 431 | pp->lazy_line = xstrdup(arg); |
2a9c8c36 MH |
432 | break; |
433 | } | |
434 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
435 | if (ptr) { |
436 | nc = *ptr; | |
437 | *ptr++ = '\0'; | |
438 | } | |
439 | switch (c) { | |
440 | case ':': /* Line number */ | |
441 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 442 | if (*tmp != '\0') { |
2a9c8c36 | 443 | semantic_error("There is non-digit char" |
146a1439 MH |
444 | " in line number.\n"); |
445 | return -EINVAL; | |
446 | } | |
50656eec MH |
447 | break; |
448 | case '+': /* Byte offset from a symbol */ | |
449 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 450 | if (*tmp != '\0') { |
2a9c8c36 | 451 | semantic_error("There is non-digit character" |
146a1439 MH |
452 | " in offset.\n"); |
453 | return -EINVAL; | |
454 | } | |
50656eec MH |
455 | break; |
456 | case '@': /* File name */ | |
146a1439 MH |
457 | if (pp->file) { |
458 | semantic_error("SRC@SRC is not allowed.\n"); | |
459 | return -EINVAL; | |
460 | } | |
31facc5f | 461 | pp->file = xstrdup(arg); |
50656eec MH |
462 | break; |
463 | case '%': /* Probe places */ | |
464 | if (strcmp(arg, "return") == 0) { | |
465 | pp->retprobe = 1; | |
146a1439 MH |
466 | } else { /* Others not supported yet */ |
467 | semantic_error("%%%s is not supported.\n", arg); | |
468 | return -ENOTSUP; | |
469 | } | |
50656eec | 470 | break; |
146a1439 MH |
471 | default: /* Buggy case */ |
472 | pr_err("This program has a bug at %s:%d.\n", | |
473 | __FILE__, __LINE__); | |
474 | return -ENOTSUP; | |
50656eec MH |
475 | break; |
476 | } | |
477 | } | |
478 | ||
479 | /* Exclusion check */ | |
146a1439 | 480 | if (pp->lazy_line && pp->line) { |
2a9c8c36 | 481 | semantic_error("Lazy pattern can't be used with line number."); |
146a1439 MH |
482 | return -EINVAL; |
483 | } | |
2a9c8c36 | 484 | |
146a1439 | 485 | if (pp->lazy_line && pp->offset) { |
2a9c8c36 | 486 | semantic_error("Lazy pattern can't be used with offset."); |
146a1439 MH |
487 | return -EINVAL; |
488 | } | |
2a9c8c36 | 489 | |
146a1439 | 490 | if (pp->line && pp->offset) { |
50656eec | 491 | semantic_error("Offset can't be used with line number."); |
146a1439 MH |
492 | return -EINVAL; |
493 | } | |
50656eec | 494 | |
146a1439 | 495 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 MH |
496 | semantic_error("File always requires line number or " |
497 | "lazy pattern."); | |
146a1439 MH |
498 | return -EINVAL; |
499 | } | |
50656eec | 500 | |
146a1439 | 501 | if (pp->offset && !pp->function) { |
50656eec | 502 | semantic_error("Offset requires an entry function."); |
146a1439 MH |
503 | return -EINVAL; |
504 | } | |
50656eec | 505 | |
146a1439 | 506 | if (pp->retprobe && !pp->function) { |
50656eec | 507 | semantic_error("Return probe requires an entry function."); |
146a1439 MH |
508 | return -EINVAL; |
509 | } | |
50656eec | 510 | |
146a1439 | 511 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 MH |
512 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
513 | "return probe."); | |
146a1439 MH |
514 | return -EINVAL; |
515 | } | |
50656eec | 516 | |
4235b045 | 517 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
518 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
519 | pp->lazy_line); | |
146a1439 | 520 | return 0; |
50656eec MH |
521 | } |
522 | ||
7df2f329 | 523 | /* Parse perf-probe event argument */ |
146a1439 | 524 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 525 | { |
48481938 | 526 | char *tmp; |
7df2f329 MH |
527 | struct perf_probe_arg_field **fieldp; |
528 | ||
529 | pr_debug("parsing arg: %s into ", str); | |
530 | ||
48481938 MH |
531 | tmp = strchr(str, '='); |
532 | if (tmp) { | |
533 | arg->name = xstrndup(str, tmp - str); | |
11a1ca35 | 534 | pr_debug("name:%s ", arg->name); |
48481938 MH |
535 | str = tmp + 1; |
536 | } | |
537 | ||
11a1ca35 MH |
538 | tmp = strchr(str, ':'); |
539 | if (tmp) { /* Type setting */ | |
540 | *tmp = '\0'; | |
541 | arg->type = xstrdup(tmp + 1); | |
542 | pr_debug("type:%s ", arg->type); | |
543 | } | |
544 | ||
7df2f329 MH |
545 | tmp = strpbrk(str, "-."); |
546 | if (!is_c_varname(str) || !tmp) { | |
547 | /* A variable, register, symbol or special value */ | |
48481938 MH |
548 | arg->var = xstrdup(str); |
549 | pr_debug("%s\n", arg->var); | |
146a1439 | 550 | return 0; |
7df2f329 MH |
551 | } |
552 | ||
553 | /* Structure fields */ | |
48481938 MH |
554 | arg->var = xstrndup(str, tmp - str); |
555 | pr_debug("%s, ", arg->var); | |
7df2f329 MH |
556 | fieldp = &arg->field; |
557 | ||
558 | do { | |
e334016f MH |
559 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
560 | if (*fieldp == NULL) | |
561 | return -ENOMEM; | |
7df2f329 MH |
562 | if (*tmp == '.') { |
563 | str = tmp + 1; | |
564 | (*fieldp)->ref = false; | |
565 | } else if (tmp[1] == '>') { | |
566 | str = tmp + 2; | |
567 | (*fieldp)->ref = true; | |
146a1439 MH |
568 | } else { |
569 | semantic_error("Argument parse error: %s\n", str); | |
570 | return -EINVAL; | |
571 | } | |
7df2f329 MH |
572 | |
573 | tmp = strpbrk(str, "-."); | |
574 | if (tmp) { | |
575 | (*fieldp)->name = xstrndup(str, tmp - str); | |
576 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); | |
577 | fieldp = &(*fieldp)->next; | |
578 | } | |
579 | } while (tmp); | |
580 | (*fieldp)->name = xstrdup(str); | |
581 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); | |
df0faf4b MH |
582 | |
583 | /* If no name is specified, set the last field name */ | |
584 | if (!arg->name) | |
585 | arg->name = xstrdup((*fieldp)->name); | |
146a1439 MH |
586 | |
587 | return 0; | |
7df2f329 MH |
588 | } |
589 | ||
4235b045 | 590 | /* Parse perf-probe event command */ |
146a1439 | 591 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 592 | { |
e1c01d61 | 593 | char **argv; |
146a1439 | 594 | int argc, i, ret = 0; |
fac13fd5 | 595 | |
4235b045 | 596 | argv = argv_split(cmd, &argc); |
146a1439 MH |
597 | if (!argv) { |
598 | pr_debug("Failed to split arguments.\n"); | |
599 | return -ENOMEM; | |
600 | } | |
601 | if (argc - 1 > MAX_PROBE_ARGS) { | |
602 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
603 | ret = -ERANGE; | |
604 | goto out; | |
605 | } | |
50656eec | 606 | /* Parse probe point */ |
146a1439 MH |
607 | ret = parse_perf_probe_point(argv[0], pev); |
608 | if (ret < 0) | |
609 | goto out; | |
50656eec | 610 | |
e1c01d61 | 611 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 612 | pev->nargs = argc - 1; |
e334016f MH |
613 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
614 | if (pev->args == NULL) { | |
615 | ret = -ENOMEM; | |
616 | goto out; | |
617 | } | |
146a1439 MH |
618 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
619 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
620 | if (ret >= 0 && | |
621 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 622 | semantic_error("You can't specify local variable for" |
146a1439 MH |
623 | " kretprobe.\n"); |
624 | ret = -EINVAL; | |
625 | } | |
e1c01d61 | 626 | } |
146a1439 | 627 | out: |
e1c01d61 | 628 | argv_free(argv); |
146a1439 MH |
629 | |
630 | return ret; | |
50656eec MH |
631 | } |
632 | ||
4235b045 MH |
633 | /* Return true if this perf_probe_event requires debuginfo */ |
634 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
635 | { | |
636 | int i; | |
637 | ||
638 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
639 | return true; | |
640 | ||
641 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 642 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
643 | return true; |
644 | ||
645 | return false; | |
646 | } | |
647 | ||
4de189fe | 648 | /* Parse kprobe_events event into struct probe_point */ |
146a1439 | 649 | int parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev) |
4de189fe | 650 | { |
4235b045 | 651 | struct kprobe_trace_point *tp = &tev->point; |
4de189fe MH |
652 | char pr; |
653 | char *p; | |
654 | int ret, i, argc; | |
655 | char **argv; | |
656 | ||
4235b045 MH |
657 | pr_debug("Parsing kprobe_events: %s\n", cmd); |
658 | argv = argv_split(cmd, &argc); | |
146a1439 MH |
659 | if (!argv) { |
660 | pr_debug("Failed to split arguments.\n"); | |
661 | return -ENOMEM; | |
662 | } | |
663 | if (argc < 2) { | |
664 | semantic_error("Too few probe arguments.\n"); | |
665 | ret = -ERANGE; | |
666 | goto out; | |
667 | } | |
4de189fe MH |
668 | |
669 | /* Scan event and group name. */ | |
93aaa45a | 670 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
671 | &pr, (float *)(void *)&tev->group, |
672 | (float *)(void *)&tev->event); | |
146a1439 MH |
673 | if (ret != 3) { |
674 | semantic_error("Failed to parse event name: %s\n", argv[0]); | |
675 | ret = -EINVAL; | |
676 | goto out; | |
677 | } | |
4235b045 | 678 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 679 | |
4235b045 | 680 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
681 | |
682 | /* Scan function name and offset */ | |
4235b045 MH |
683 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
684 | &tp->offset); | |
4de189fe | 685 | if (ret == 1) |
4235b045 | 686 | tp->offset = 0; |
4de189fe | 687 | |
4235b045 | 688 | tev->nargs = argc - 2; |
e334016f MH |
689 | tev->args = zalloc(sizeof(struct kprobe_trace_arg) * tev->nargs); |
690 | if (tev->args == NULL) { | |
691 | ret = -ENOMEM; | |
692 | goto out; | |
693 | } | |
4235b045 | 694 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
695 | p = strchr(argv[i + 2], '='); |
696 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
697 | *p++ = '\0'; |
698 | else | |
699 | p = argv[i + 2]; | |
700 | tev->args[i].name = xstrdup(argv[i + 2]); | |
701 | /* TODO: parse regs and offset */ | |
702 | tev->args[i].value = xstrdup(p); | |
4de189fe | 703 | } |
146a1439 MH |
704 | ret = 0; |
705 | out: | |
4de189fe | 706 | argv_free(argv); |
146a1439 | 707 | return ret; |
4de189fe MH |
708 | } |
709 | ||
7df2f329 MH |
710 | /* Compose only probe arg */ |
711 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
712 | { | |
713 | struct perf_probe_arg_field *field = pa->field; | |
714 | int ret; | |
715 | char *tmp = buf; | |
716 | ||
48481938 MH |
717 | if (pa->name && pa->var) |
718 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
719 | else | |
720 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
721 | if (ret <= 0) |
722 | goto error; | |
723 | tmp += ret; | |
724 | len -= ret; | |
725 | ||
726 | while (field) { | |
727 | ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".", | |
728 | field->name); | |
729 | if (ret <= 0) | |
730 | goto error; | |
731 | tmp += ret; | |
732 | len -= ret; | |
733 | field = field->next; | |
734 | } | |
11a1ca35 MH |
735 | |
736 | if (pa->type) { | |
737 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
738 | if (ret <= 0) | |
739 | goto error; | |
740 | tmp += ret; | |
741 | len -= ret; | |
742 | } | |
743 | ||
7df2f329 MH |
744 | return tmp - buf; |
745 | error: | |
146a1439 MH |
746 | pr_debug("Failed to synthesize perf probe argument: %s", |
747 | strerror(-ret)); | |
748 | return ret; | |
7df2f329 MH |
749 | } |
750 | ||
4235b045 MH |
751 | /* Compose only probe point (not argument) */ |
752 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 753 | { |
fb1587d8 MH |
754 | char *buf, *tmp; |
755 | char offs[32] = "", line[32] = "", file[32] = ""; | |
756 | int ret, len; | |
4de189fe | 757 | |
e334016f MH |
758 | buf = zalloc(MAX_CMDLEN); |
759 | if (buf == NULL) { | |
760 | ret = -ENOMEM; | |
761 | goto error; | |
762 | } | |
4de189fe | 763 | if (pp->offset) { |
fb1587d8 | 764 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
765 | if (ret <= 0) |
766 | goto error; | |
767 | } | |
768 | if (pp->line) { | |
fb1587d8 MH |
769 | ret = e_snprintf(line, 32, ":%d", pp->line); |
770 | if (ret <= 0) | |
771 | goto error; | |
772 | } | |
773 | if (pp->file) { | |
774 | len = strlen(pp->file) - 32; | |
775 | if (len < 0) | |
776 | len = 0; | |
777 | tmp = strchr(pp->file + len, '/'); | |
778 | if (!tmp) | |
779 | tmp = pp->file + len - 1; | |
780 | ret = e_snprintf(file, 32, "@%s", tmp + 1); | |
4de189fe MH |
781 | if (ret <= 0) |
782 | goto error; | |
783 | } | |
784 | ||
785 | if (pp->function) | |
fb1587d8 MH |
786 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
787 | offs, pp->retprobe ? "%return" : "", line, | |
788 | file); | |
4de189fe | 789 | else |
fb1587d8 | 790 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
791 | if (ret <= 0) |
792 | goto error; | |
793 | ||
794 | return buf; | |
7ef17aaf | 795 | error: |
146a1439 MH |
796 | pr_debug("Failed to synthesize perf probe point: %s", |
797 | strerror(-ret)); | |
e334016f MH |
798 | if (buf) |
799 | free(buf); | |
146a1439 | 800 | return NULL; |
7ef17aaf MH |
801 | } |
802 | ||
4235b045 MH |
803 | #if 0 |
804 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
805 | { |
806 | char *buf; | |
807 | int i, len, ret; | |
808 | ||
4235b045 MH |
809 | buf = synthesize_perf_probe_point(&pev->point); |
810 | if (!buf) | |
811 | return NULL; | |
4de189fe | 812 | |
4235b045 MH |
813 | len = strlen(buf); |
814 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 815 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
816 | pev->args[i].name); |
817 | if (ret <= 0) { | |
818 | free(buf); | |
819 | return NULL; | |
820 | } | |
4de189fe MH |
821 | len += ret; |
822 | } | |
4de189fe | 823 | |
4235b045 MH |
824 | return buf; |
825 | } | |
826 | #endif | |
827 | ||
828 | static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref, | |
829 | char **buf, size_t *buflen, | |
830 | int depth) | |
831 | { | |
832 | int ret; | |
833 | if (ref->next) { | |
834 | depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf, | |
835 | buflen, depth + 1); | |
836 | if (depth < 0) | |
837 | goto out; | |
838 | } | |
839 | ||
840 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
841 | if (ret < 0) | |
842 | depth = ret; | |
843 | else { | |
844 | *buf += ret; | |
845 | *buflen -= ret; | |
846 | } | |
847 | out: | |
848 | return depth; | |
4de189fe | 849 | |
4de189fe MH |
850 | } |
851 | ||
4235b045 MH |
852 | static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg, |
853 | char *buf, size_t buflen) | |
50656eec | 854 | { |
4235b045 MH |
855 | int ret, depth = 0; |
856 | char *tmp = buf; | |
857 | ||
858 | /* Argument name or separator */ | |
859 | if (arg->name) | |
860 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
861 | else | |
862 | ret = e_snprintf(buf, buflen, " "); | |
863 | if (ret < 0) | |
864 | return ret; | |
865 | buf += ret; | |
866 | buflen -= ret; | |
867 | ||
868 | /* Dereferencing arguments */ | |
869 | if (arg->ref) { | |
870 | depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf, | |
871 | &buflen, 1); | |
872 | if (depth < 0) | |
873 | return depth; | |
874 | } | |
875 | ||
876 | /* Print argument value */ | |
877 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
878 | if (ret < 0) | |
879 | return ret; | |
880 | buf += ret; | |
881 | buflen -= ret; | |
882 | ||
883 | /* Closing */ | |
884 | while (depth--) { | |
885 | ret = e_snprintf(buf, buflen, ")"); | |
886 | if (ret < 0) | |
887 | return ret; | |
888 | buf += ret; | |
889 | buflen -= ret; | |
890 | } | |
4984912e MH |
891 | /* Print argument type */ |
892 | if (arg->type) { | |
893 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
894 | if (ret <= 0) | |
895 | return ret; | |
896 | buf += ret; | |
897 | } | |
4235b045 MH |
898 | |
899 | return buf - tmp; | |
900 | } | |
901 | ||
902 | char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev) | |
903 | { | |
904 | struct kprobe_trace_point *tp = &tev->point; | |
50656eec MH |
905 | char *buf; |
906 | int i, len, ret; | |
907 | ||
e334016f MH |
908 | buf = zalloc(MAX_CMDLEN); |
909 | if (buf == NULL) | |
910 | return NULL; | |
911 | ||
4235b045 MH |
912 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", |
913 | tp->retprobe ? 'r' : 'p', | |
914 | tev->group, tev->event, | |
915 | tp->symbol, tp->offset); | |
916 | if (len <= 0) | |
50656eec | 917 | goto error; |
50656eec | 918 | |
4235b045 MH |
919 | for (i = 0; i < tev->nargs; i++) { |
920 | ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len, | |
921 | MAX_CMDLEN - len); | |
4de189fe | 922 | if (ret <= 0) |
50656eec MH |
923 | goto error; |
924 | len += ret; | |
925 | } | |
50656eec | 926 | |
4235b045 | 927 | return buf; |
50656eec | 928 | error: |
4235b045 MH |
929 | free(buf); |
930 | return NULL; | |
931 | } | |
50656eec | 932 | |
146a1439 MH |
933 | int convert_to_perf_probe_event(struct kprobe_trace_event *tev, |
934 | struct perf_probe_event *pev) | |
4235b045 MH |
935 | { |
936 | char buf[64]; | |
146a1439 | 937 | int i, ret; |
4235b045 | 938 | |
4b4da7f7 | 939 | /* Convert event/group name */ |
fb1587d8 MH |
940 | pev->event = xstrdup(tev->event); |
941 | pev->group = xstrdup(tev->group); | |
942 | ||
4b4da7f7 | 943 | /* Convert trace_point to probe_point */ |
146a1439 MH |
944 | ret = convert_to_perf_probe_point(&tev->point, &pev->point); |
945 | if (ret < 0) | |
946 | return ret; | |
4b4da7f7 | 947 | |
4235b045 MH |
948 | /* Convert trace_arg to probe_arg */ |
949 | pev->nargs = tev->nargs; | |
e334016f MH |
950 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
951 | if (pev->args == NULL) | |
952 | return -ENOMEM; | |
146a1439 | 953 | for (i = 0; i < tev->nargs && ret >= 0; i++) |
4235b045 MH |
954 | if (tev->args[i].name) |
955 | pev->args[i].name = xstrdup(tev->args[i].name); | |
956 | else { | |
146a1439 MH |
957 | ret = synthesize_kprobe_trace_arg(&tev->args[i], |
958 | buf, 64); | |
4235b045 MH |
959 | pev->args[i].name = xstrdup(buf); |
960 | } | |
146a1439 MH |
961 | |
962 | if (ret < 0) | |
963 | clear_perf_probe_event(pev); | |
964 | ||
965 | return ret; | |
4235b045 MH |
966 | } |
967 | ||
968 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
969 | { | |
970 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 971 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
972 | int i; |
973 | ||
974 | if (pev->event) | |
975 | free(pev->event); | |
976 | if (pev->group) | |
977 | free(pev->group); | |
978 | if (pp->file) | |
979 | free(pp->file); | |
980 | if (pp->function) | |
981 | free(pp->function); | |
982 | if (pp->lazy_line) | |
983 | free(pp->lazy_line); | |
7df2f329 | 984 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
985 | if (pev->args[i].name) |
986 | free(pev->args[i].name); | |
48481938 MH |
987 | if (pev->args[i].var) |
988 | free(pev->args[i].var); | |
11a1ca35 MH |
989 | if (pev->args[i].type) |
990 | free(pev->args[i].type); | |
7df2f329 MH |
991 | field = pev->args[i].field; |
992 | while (field) { | |
993 | next = field->next; | |
994 | if (field->name) | |
995 | free(field->name); | |
996 | free(field); | |
997 | field = next; | |
998 | } | |
999 | } | |
4235b045 MH |
1000 | if (pev->args) |
1001 | free(pev->args); | |
1002 | memset(pev, 0, sizeof(*pev)); | |
1003 | } | |
1004 | ||
1005 | void clear_kprobe_trace_event(struct kprobe_trace_event *tev) | |
1006 | { | |
1007 | struct kprobe_trace_arg_ref *ref, *next; | |
1008 | int i; | |
1009 | ||
1010 | if (tev->event) | |
1011 | free(tev->event); | |
1012 | if (tev->group) | |
1013 | free(tev->group); | |
1014 | if (tev->point.symbol) | |
1015 | free(tev->point.symbol); | |
1016 | for (i = 0; i < tev->nargs; i++) { | |
1017 | if (tev->args[i].name) | |
1018 | free(tev->args[i].name); | |
1019 | if (tev->args[i].value) | |
1020 | free(tev->args[i].value); | |
4984912e MH |
1021 | if (tev->args[i].type) |
1022 | free(tev->args[i].type); | |
4235b045 MH |
1023 | ref = tev->args[i].ref; |
1024 | while (ref) { | |
1025 | next = ref->next; | |
1026 | free(ref); | |
1027 | ref = next; | |
1028 | } | |
1029 | } | |
1030 | if (tev->args) | |
1031 | free(tev->args); | |
1032 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
1033 | } |
1034 | ||
f4d7da49 | 1035 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
1036 | { |
1037 | char buf[PATH_MAX]; | |
1038 | int ret; | |
1039 | ||
1040 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
146a1439 MH |
1041 | if (ret >= 0) { |
1042 | if (readwrite && !probe_event_dry_run) | |
1043 | ret = open(buf, O_RDWR, O_APPEND); | |
1044 | else | |
1045 | ret = open(buf, O_RDONLY, 0); | |
1046 | } | |
f4d7da49 | 1047 | |
4de189fe MH |
1048 | if (ret < 0) { |
1049 | if (errno == ENOENT) | |
146a1439 MH |
1050 | pr_warning("kprobe_events file does not exist - please" |
1051 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); | |
4de189fe | 1052 | else |
146a1439 MH |
1053 | pr_warning("Failed to open kprobe_events file: %s\n", |
1054 | strerror(errno)); | |
4de189fe MH |
1055 | } |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | /* Get raw string list of current kprobe_events */ | |
4235b045 | 1060 | static struct strlist *get_kprobe_trace_command_rawlist(int fd) |
4de189fe MH |
1061 | { |
1062 | int ret, idx; | |
1063 | FILE *fp; | |
1064 | char buf[MAX_CMDLEN]; | |
1065 | char *p; | |
1066 | struct strlist *sl; | |
1067 | ||
1068 | sl = strlist__new(true, NULL); | |
1069 | ||
1070 | fp = fdopen(dup(fd), "r"); | |
1071 | while (!feof(fp)) { | |
1072 | p = fgets(buf, MAX_CMDLEN, fp); | |
1073 | if (!p) | |
1074 | break; | |
1075 | ||
1076 | idx = strlen(p) - 1; | |
1077 | if (p[idx] == '\n') | |
1078 | p[idx] = '\0'; | |
1079 | ret = strlist__add(sl, buf); | |
146a1439 MH |
1080 | if (ret < 0) { |
1081 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); | |
1082 | strlist__delete(sl); | |
1083 | return NULL; | |
1084 | } | |
4de189fe MH |
1085 | } |
1086 | fclose(fp); | |
1087 | ||
1088 | return sl; | |
1089 | } | |
1090 | ||
278498d4 | 1091 | /* Show an event */ |
146a1439 | 1092 | static int show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 1093 | { |
7e990a51 | 1094 | int i, ret; |
278498d4 | 1095 | char buf[128]; |
4235b045 | 1096 | char *place; |
278498d4 | 1097 | |
4235b045 MH |
1098 | /* Synthesize only event probe point */ |
1099 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
1100 | if (!place) |
1101 | return -EINVAL; | |
4235b045 MH |
1102 | |
1103 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 | 1104 | if (ret < 0) |
146a1439 MH |
1105 | return ret; |
1106 | ||
fb1587d8 | 1107 | printf(" %-20s (on %s", buf, place); |
278498d4 | 1108 | |
4235b045 | 1109 | if (pev->nargs > 0) { |
278498d4 | 1110 | printf(" with"); |
7df2f329 | 1111 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
1112 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1113 | buf, 128); | |
1114 | if (ret < 0) | |
1115 | break; | |
7df2f329 MH |
1116 | printf(" %s", buf); |
1117 | } | |
278498d4 MH |
1118 | } |
1119 | printf(")\n"); | |
4235b045 | 1120 | free(place); |
146a1439 | 1121 | return ret; |
278498d4 MH |
1122 | } |
1123 | ||
4de189fe | 1124 | /* List up current perf-probe events */ |
146a1439 | 1125 | int show_perf_probe_events(void) |
4de189fe | 1126 | { |
146a1439 | 1127 | int fd, ret; |
4235b045 MH |
1128 | struct kprobe_trace_event tev; |
1129 | struct perf_probe_event pev; | |
4de189fe MH |
1130 | struct strlist *rawlist; |
1131 | struct str_node *ent; | |
1132 | ||
72041334 | 1133 | setup_pager(); |
146a1439 MH |
1134 | ret = init_vmlinux(); |
1135 | if (ret < 0) | |
1136 | return ret; | |
4235b045 MH |
1137 | |
1138 | memset(&tev, 0, sizeof(tev)); | |
1139 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 1140 | |
f4d7da49 | 1141 | fd = open_kprobe_events(false); |
146a1439 MH |
1142 | if (fd < 0) |
1143 | return fd; | |
1144 | ||
4235b045 | 1145 | rawlist = get_kprobe_trace_command_rawlist(fd); |
4de189fe | 1146 | close(fd); |
146a1439 MH |
1147 | if (!rawlist) |
1148 | return -ENOENT; | |
4de189fe | 1149 | |
adf365f4 | 1150 | strlist__for_each(ent, rawlist) { |
146a1439 MH |
1151 | ret = parse_kprobe_trace_command(ent->s, &tev); |
1152 | if (ret >= 0) { | |
1153 | ret = convert_to_perf_probe_event(&tev, &pev); | |
1154 | if (ret >= 0) | |
1155 | ret = show_perf_probe_event(&pev); | |
1156 | } | |
4235b045 MH |
1157 | clear_perf_probe_event(&pev); |
1158 | clear_kprobe_trace_event(&tev); | |
146a1439 MH |
1159 | if (ret < 0) |
1160 | break; | |
4de189fe | 1161 | } |
4de189fe | 1162 | strlist__delete(rawlist); |
146a1439 MH |
1163 | |
1164 | return ret; | |
4de189fe MH |
1165 | } |
1166 | ||
b498ce1f | 1167 | /* Get current perf-probe event names */ |
4235b045 | 1168 | static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group) |
b498ce1f | 1169 | { |
fa28244d | 1170 | char buf[128]; |
b498ce1f MH |
1171 | struct strlist *sl, *rawlist; |
1172 | struct str_node *ent; | |
4235b045 | 1173 | struct kprobe_trace_event tev; |
146a1439 | 1174 | int ret = 0; |
b498ce1f | 1175 | |
4235b045 | 1176 | memset(&tev, 0, sizeof(tev)); |
b498ce1f | 1177 | |
4235b045 | 1178 | rawlist = get_kprobe_trace_command_rawlist(fd); |
e1d2017b | 1179 | sl = strlist__new(true, NULL); |
adf365f4 | 1180 | strlist__for_each(ent, rawlist) { |
146a1439 MH |
1181 | ret = parse_kprobe_trace_command(ent->s, &tev); |
1182 | if (ret < 0) | |
1183 | break; | |
fa28244d | 1184 | if (include_group) { |
146a1439 MH |
1185 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1186 | tev.event); | |
1187 | if (ret >= 0) | |
1188 | ret = strlist__add(sl, buf); | |
fa28244d | 1189 | } else |
146a1439 | 1190 | ret = strlist__add(sl, tev.event); |
4235b045 | 1191 | clear_kprobe_trace_event(&tev); |
146a1439 MH |
1192 | if (ret < 0) |
1193 | break; | |
b498ce1f | 1194 | } |
b498ce1f MH |
1195 | strlist__delete(rawlist); |
1196 | ||
146a1439 MH |
1197 | if (ret < 0) { |
1198 | strlist__delete(sl); | |
1199 | return NULL; | |
1200 | } | |
b498ce1f MH |
1201 | return sl; |
1202 | } | |
1203 | ||
146a1439 | 1204 | static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev) |
50656eec MH |
1205 | { |
1206 | int ret; | |
4235b045 | 1207 | char *buf = synthesize_kprobe_trace_command(tev); |
50656eec | 1208 | |
146a1439 MH |
1209 | if (!buf) { |
1210 | pr_debug("Failed to synthesize kprobe trace event.\n"); | |
1211 | return -EINVAL; | |
1212 | } | |
1213 | ||
fa28244d | 1214 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1215 | if (!probe_event_dry_run) { |
1216 | ret = write(fd, buf, strlen(buf)); | |
1217 | if (ret <= 0) | |
146a1439 MH |
1218 | pr_warning("Failed to write event: %s\n", |
1219 | strerror(errno)); | |
f4d7da49 | 1220 | } |
4235b045 | 1221 | free(buf); |
146a1439 | 1222 | return ret; |
50656eec MH |
1223 | } |
1224 | ||
146a1439 MH |
1225 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1226 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
1227 | { |
1228 | int i, ret; | |
17f88fcd MH |
1229 | |
1230 | /* Try no suffix */ | |
1231 | ret = e_snprintf(buf, len, "%s", base); | |
146a1439 MH |
1232 | if (ret < 0) { |
1233 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1234 | return ret; | |
1235 | } | |
17f88fcd | 1236 | if (!strlist__has_entry(namelist, buf)) |
146a1439 | 1237 | return 0; |
17f88fcd | 1238 | |
d761b08b MH |
1239 | if (!allow_suffix) { |
1240 | pr_warning("Error: event \"%s\" already exists. " | |
1241 | "(Use -f to force duplicates.)\n", base); | |
146a1439 | 1242 | return -EEXIST; |
d761b08b MH |
1243 | } |
1244 | ||
17f88fcd MH |
1245 | /* Try to add suffix */ |
1246 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f | 1247 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
146a1439 MH |
1248 | if (ret < 0) { |
1249 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1250 | return ret; | |
1251 | } | |
b498ce1f MH |
1252 | if (!strlist__has_entry(namelist, buf)) |
1253 | break; | |
1254 | } | |
146a1439 MH |
1255 | if (i == MAX_EVENT_INDEX) { |
1256 | pr_warning("Too many events are on the same function.\n"); | |
1257 | ret = -ERANGE; | |
1258 | } | |
1259 | ||
1260 | return ret; | |
b498ce1f MH |
1261 | } |
1262 | ||
146a1439 MH |
1263 | static int __add_kprobe_trace_events(struct perf_probe_event *pev, |
1264 | struct kprobe_trace_event *tevs, | |
1265 | int ntevs, bool allow_suffix) | |
50656eec | 1266 | { |
146a1439 | 1267 | int i, fd, ret; |
55632770 | 1268 | struct kprobe_trace_event *tev = NULL; |
4235b045 MH |
1269 | char buf[64]; |
1270 | const char *event, *group; | |
b498ce1f | 1271 | struct strlist *namelist; |
50656eec | 1272 | |
f4d7da49 | 1273 | fd = open_kprobe_events(true); |
146a1439 MH |
1274 | if (fd < 0) |
1275 | return fd; | |
b498ce1f | 1276 | /* Get current event names */ |
4235b045 | 1277 | namelist = get_kprobe_trace_event_names(fd, false); |
146a1439 MH |
1278 | if (!namelist) { |
1279 | pr_debug("Failed to get current event list.\n"); | |
1280 | return -EIO; | |
1281 | } | |
4235b045 | 1282 | |
146a1439 | 1283 | ret = 0; |
4235b045 | 1284 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
146a1439 | 1285 | for (i = 0; i < ntevs && ret >= 0; i++) { |
4235b045 MH |
1286 | tev = &tevs[i]; |
1287 | if (pev->event) | |
1288 | event = pev->event; | |
1289 | else | |
1290 | if (pev->point.function) | |
1291 | event = pev->point.function; | |
1292 | else | |
1293 | event = tev->point.symbol; | |
1294 | if (pev->group) | |
1295 | group = pev->group; | |
1296 | else | |
1297 | group = PERFPROBE_GROUP; | |
1298 | ||
1299 | /* Get an unused new event name */ | |
146a1439 MH |
1300 | ret = get_new_event_name(buf, 64, event, |
1301 | namelist, allow_suffix); | |
1302 | if (ret < 0) | |
1303 | break; | |
4235b045 MH |
1304 | event = buf; |
1305 | ||
1306 | tev->event = xstrdup(event); | |
1307 | tev->group = xstrdup(group); | |
146a1439 MH |
1308 | ret = write_kprobe_trace_event(fd, tev); |
1309 | if (ret < 0) | |
1310 | break; | |
4235b045 MH |
1311 | /* Add added event name to namelist */ |
1312 | strlist__add(namelist, event); | |
1313 | ||
1314 | /* Trick here - save current event/group */ | |
1315 | event = pev->event; | |
1316 | group = pev->group; | |
1317 | pev->event = tev->event; | |
1318 | pev->group = tev->group; | |
1319 | show_perf_probe_event(pev); | |
1320 | /* Trick here - restore current event/group */ | |
1321 | pev->event = (char *)event; | |
1322 | pev->group = (char *)group; | |
1323 | ||
1324 | /* | |
1325 | * Probes after the first probe which comes from same | |
1326 | * user input are always allowed to add suffix, because | |
1327 | * there might be several addresses corresponding to | |
1328 | * one code line. | |
1329 | */ | |
1330 | allow_suffix = true; | |
50656eec | 1331 | } |
146a1439 MH |
1332 | |
1333 | if (ret >= 0) { | |
1334 | /* Show how to use the event. */ | |
1335 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
1336 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, | |
1337 | tev->event); | |
1338 | } | |
a9b495b0 | 1339 | |
e1d2017b | 1340 | strlist__delete(namelist); |
50656eec | 1341 | close(fd); |
146a1439 | 1342 | return ret; |
50656eec | 1343 | } |
fa28244d | 1344 | |
4235b045 MH |
1345 | static int convert_to_kprobe_trace_events(struct perf_probe_event *pev, |
1346 | struct kprobe_trace_event **tevs) | |
e0faa8d3 MH |
1347 | { |
1348 | struct symbol *sym; | |
e334016f | 1349 | int ret = 0, i; |
4235b045 MH |
1350 | struct kprobe_trace_event *tev; |
1351 | ||
4b4da7f7 | 1352 | /* Convert perf_probe_event with debuginfo */ |
e334016f MH |
1353 | ret = try_to_find_kprobe_trace_events(pev, tevs); |
1354 | if (ret != 0) | |
1355 | return ret; | |
e0faa8d3 | 1356 | |
4235b045 | 1357 | /* Allocate trace event buffer */ |
e334016f MH |
1358 | tev = *tevs = zalloc(sizeof(struct kprobe_trace_event)); |
1359 | if (tev == NULL) | |
1360 | return -ENOMEM; | |
4235b045 MH |
1361 | |
1362 | /* Copy parameters */ | |
1363 | tev->point.symbol = xstrdup(pev->point.function); | |
1364 | tev->point.offset = pev->point.offset; | |
1365 | tev->nargs = pev->nargs; | |
1366 | if (tev->nargs) { | |
e334016f MH |
1367 | tev->args = zalloc(sizeof(struct kprobe_trace_arg) |
1368 | * tev->nargs); | |
1369 | if (tev->args == NULL) { | |
1370 | free(tev); | |
1371 | *tevs = NULL; | |
1372 | return -ENOMEM; | |
1373 | } | |
48481938 MH |
1374 | for (i = 0; i < tev->nargs; i++) { |
1375 | if (pev->args[i].name) | |
1376 | tev->args[i].name = xstrdup(pev->args[i].name); | |
1377 | tev->args[i].value = xstrdup(pev->args[i].var); | |
11a1ca35 MH |
1378 | if (pev->args[i].type) |
1379 | tev->args[i].type = xstrdup(pev->args[i].type); | |
48481938 | 1380 | } |
4235b045 MH |
1381 | } |
1382 | ||
1383 | /* Currently just checking function name from symbol map */ | |
1384 | sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION], | |
1385 | tev->point.symbol, NULL); | |
146a1439 MH |
1386 | if (!sym) { |
1387 | pr_warning("Kernel symbol \'%s\' not found.\n", | |
1388 | tev->point.symbol); | |
e334016f MH |
1389 | clear_kprobe_trace_event(tev); |
1390 | free(tev); | |
1391 | *tevs = NULL; | |
146a1439 | 1392 | return -ENOENT; |
e334016f MH |
1393 | } else |
1394 | ret = 1; | |
1395 | ||
1396 | return ret; | |
4235b045 MH |
1397 | } |
1398 | ||
1399 | struct __event_package { | |
1400 | struct perf_probe_event *pev; | |
1401 | struct kprobe_trace_event *tevs; | |
1402 | int ntevs; | |
1403 | }; | |
1404 | ||
146a1439 MH |
1405 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
1406 | bool force_add) | |
4235b045 | 1407 | { |
146a1439 | 1408 | int i, j, ret; |
4235b045 MH |
1409 | struct __event_package *pkgs; |
1410 | ||
e334016f MH |
1411 | pkgs = zalloc(sizeof(struct __event_package) * npevs); |
1412 | if (pkgs == NULL) | |
1413 | return -ENOMEM; | |
4235b045 MH |
1414 | |
1415 | /* Init vmlinux path */ | |
146a1439 MH |
1416 | ret = init_vmlinux(); |
1417 | if (ret < 0) | |
1418 | return ret; | |
4235b045 MH |
1419 | |
1420 | /* Loop 1: convert all events */ | |
1421 | for (i = 0; i < npevs; i++) { | |
1422 | pkgs[i].pev = &pevs[i]; | |
1423 | /* Convert with or without debuginfo */ | |
146a1439 MH |
1424 | ret = convert_to_kprobe_trace_events(pkgs[i].pev, |
1425 | &pkgs[i].tevs); | |
1426 | if (ret < 0) | |
1427 | goto end; | |
1428 | pkgs[i].ntevs = ret; | |
e0faa8d3 MH |
1429 | } |
1430 | ||
4235b045 | 1431 | /* Loop 2: add all events */ |
146a1439 MH |
1432 | for (i = 0; i < npevs && ret >= 0; i++) |
1433 | ret = __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs, | |
1434 | pkgs[i].ntevs, force_add); | |
1435 | end: | |
1436 | /* Loop 3: cleanup trace events */ | |
4235b045 | 1437 | for (i = 0; i < npevs; i++) |
146a1439 MH |
1438 | for (j = 0; j < pkgs[i].ntevs; j++) |
1439 | clear_kprobe_trace_event(&pkgs[i].tevs[j]); | |
1440 | ||
1441 | return ret; | |
e0faa8d3 MH |
1442 | } |
1443 | ||
146a1439 | 1444 | static int __del_trace_kprobe_event(int fd, struct str_node *ent) |
bbbb521b MH |
1445 | { |
1446 | char *p; | |
1447 | char buf[128]; | |
4235b045 | 1448 | int ret; |
bbbb521b MH |
1449 | |
1450 | /* Convert from perf-probe event to trace-kprobe event */ | |
146a1439 MH |
1451 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1452 | if (ret < 0) | |
1453 | goto error; | |
1454 | ||
bbbb521b | 1455 | p = strchr(buf + 2, ':'); |
146a1439 MH |
1456 | if (!p) { |
1457 | pr_debug("Internal error: %s should have ':' but not.\n", | |
1458 | ent->s); | |
1459 | ret = -ENOTSUP; | |
1460 | goto error; | |
1461 | } | |
bbbb521b MH |
1462 | *p = '/'; |
1463 | ||
4235b045 MH |
1464 | pr_debug("Writing event: %s\n", buf); |
1465 | ret = write(fd, buf, strlen(buf)); | |
146a1439 MH |
1466 | if (ret < 0) |
1467 | goto error; | |
1468 | ||
bbbb521b | 1469 | printf("Remove event: %s\n", ent->s); |
146a1439 MH |
1470 | return 0; |
1471 | error: | |
1472 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); | |
1473 | return ret; | |
bbbb521b MH |
1474 | } |
1475 | ||
146a1439 MH |
1476 | static int del_trace_kprobe_event(int fd, const char *group, |
1477 | const char *event, struct strlist *namelist) | |
fa28244d MH |
1478 | { |
1479 | char buf[128]; | |
bbbb521b | 1480 | struct str_node *ent, *n; |
146a1439 | 1481 | int found = 0, ret = 0; |
fa28244d | 1482 | |
146a1439 MH |
1483 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1484 | if (ret < 0) { | |
1485 | pr_err("Failed to copy event."); | |
1486 | return ret; | |
1487 | } | |
fa28244d | 1488 | |
bbbb521b MH |
1489 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1490 | strlist__for_each_safe(ent, n, namelist) | |
1491 | if (strglobmatch(ent->s, buf)) { | |
1492 | found++; | |
146a1439 MH |
1493 | ret = __del_trace_kprobe_event(fd, ent); |
1494 | if (ret < 0) | |
1495 | break; | |
bbbb521b MH |
1496 | strlist__remove(namelist, ent); |
1497 | } | |
1498 | } else { | |
1499 | ent = strlist__find(namelist, buf); | |
1500 | if (ent) { | |
1501 | found++; | |
146a1439 MH |
1502 | ret = __del_trace_kprobe_event(fd, ent); |
1503 | if (ret >= 0) | |
1504 | strlist__remove(namelist, ent); | |
bbbb521b MH |
1505 | } |
1506 | } | |
146a1439 MH |
1507 | if (found == 0 && ret >= 0) |
1508 | pr_info("Info: Event \"%s\" does not exist.\n", buf); | |
1509 | ||
1510 | return ret; | |
fa28244d MH |
1511 | } |
1512 | ||
146a1439 | 1513 | int del_perf_probe_events(struct strlist *dellist) |
fa28244d | 1514 | { |
146a1439 | 1515 | int fd, ret = 0; |
fa28244d MH |
1516 | const char *group, *event; |
1517 | char *p, *str; | |
1518 | struct str_node *ent; | |
1519 | struct strlist *namelist; | |
1520 | ||
f4d7da49 | 1521 | fd = open_kprobe_events(true); |
146a1439 MH |
1522 | if (fd < 0) |
1523 | return fd; | |
1524 | ||
fa28244d | 1525 | /* Get current event names */ |
4235b045 | 1526 | namelist = get_kprobe_trace_event_names(fd, true); |
146a1439 MH |
1527 | if (namelist == NULL) |
1528 | return -EINVAL; | |
fa28244d | 1529 | |
adf365f4 | 1530 | strlist__for_each(ent, dellist) { |
31facc5f | 1531 | str = xstrdup(ent->s); |
bbbb521b | 1532 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1533 | p = strchr(str, ':'); |
1534 | if (p) { | |
1535 | group = str; | |
1536 | *p = '\0'; | |
1537 | event = p + 1; | |
1538 | } else { | |
bbbb521b | 1539 | group = "*"; |
fa28244d MH |
1540 | event = str; |
1541 | } | |
bbbb521b | 1542 | pr_debug("Group: %s, Event: %s\n", group, event); |
146a1439 | 1543 | ret = del_trace_kprobe_event(fd, group, event, namelist); |
fa28244d | 1544 | free(str); |
146a1439 MH |
1545 | if (ret < 0) |
1546 | break; | |
fa28244d MH |
1547 | } |
1548 | strlist__delete(namelist); | |
1549 | close(fd); | |
146a1439 MH |
1550 | |
1551 | return ret; | |
fa28244d MH |
1552 | } |
1553 |