Commit | Line | Data |
---|---|---|
50656eec | 1 | /* |
0e60836b | 2 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
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" | |
7ca5989d | 45 | #include "debugfs.h" |
4b4da7f7 | 46 | #include "trace-event.h" /* For __unused */ |
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); |
d28c6223 | 75 | static struct machine machine; |
e0faa8d3 | 76 | |
4b4da7f7 | 77 | /* Initialize symbol maps and path of vmlinux */ |
146a1439 | 78 | static int init_vmlinux(void) |
e0faa8d3 | 79 | { |
a1645ce1 | 80 | struct dso *kernel; |
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 | 93 | |
d28c6223 ACM |
94 | ret = machine__init(&machine, "/", 0); |
95 | if (ret < 0) | |
96 | goto out; | |
97 | ||
a1645ce1 ZY |
98 | kernel = dso__new_kernel(symbol_conf.vmlinux_name); |
99 | if (kernel == NULL) | |
100 | die("Failed to create kernel dso."); | |
101 | ||
d28c6223 | 102 | ret = __machine__create_kernel_maps(&machine, kernel); |
146a1439 MH |
103 | if (ret < 0) |
104 | pr_debug("Failed to create kernel maps.\n"); | |
105 | ||
106 | out: | |
107 | if (ret < 0) | |
108 | pr_warning("Failed to init vmlinux path.\n"); | |
109 | return ret; | |
e0faa8d3 MH |
110 | } |
111 | ||
4b4da7f7 | 112 | #ifdef DWARF_SUPPORT |
e0faa8d3 MH |
113 | static int open_vmlinux(void) |
114 | { | |
d28c6223 | 115 | if (map__load(machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) { |
e0faa8d3 MH |
116 | pr_debug("Failed to load kernel map.\n"); |
117 | return -EINVAL; | |
118 | } | |
d28c6223 ACM |
119 | pr_debug("Try to open %s\n", machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name); |
120 | return open(machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name, O_RDONLY); | |
e0faa8d3 | 121 | } |
4b4da7f7 | 122 | |
0e60836b SD |
123 | /* |
124 | * Convert trace point to probe point with debuginfo | |
125 | * Currently only handles kprobes. | |
126 | */ | |
127 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, | |
146a1439 | 128 | struct perf_probe_point *pp) |
4b4da7f7 MH |
129 | { |
130 | struct symbol *sym; | |
146a1439 | 131 | int fd, ret = -ENOENT; |
4b4da7f7 | 132 | |
d28c6223 | 133 | sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION], |
4b4da7f7 MH |
134 | tp->symbol, NULL); |
135 | if (sym) { | |
136 | fd = open_vmlinux(); | |
146a1439 MH |
137 | if (fd >= 0) { |
138 | ret = find_perf_probe_point(fd, | |
139 | sym->start + tp->offset, pp); | |
140 | close(fd); | |
141 | } | |
4b4da7f7 MH |
142 | } |
143 | if (ret <= 0) { | |
146a1439 MH |
144 | pr_debug("Failed to find corresponding probes from " |
145 | "debuginfo. Use kprobe event information.\n"); | |
02b95dad MH |
146 | pp->function = strdup(tp->symbol); |
147 | if (pp->function == NULL) | |
148 | return -ENOMEM; | |
4b4da7f7 MH |
149 | pp->offset = tp->offset; |
150 | } | |
151 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
152 | |
153 | return 0; | |
4b4da7f7 MH |
154 | } |
155 | ||
156 | /* Try to find perf_probe_event with debuginfo */ | |
0e60836b SD |
157 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
158 | struct probe_trace_event **tevs, | |
ef4a3565 | 159 | int max_tevs) |
4b4da7f7 MH |
160 | { |
161 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
162 | int fd, ntevs; | |
163 | ||
164 | fd = open_vmlinux(); | |
165 | if (fd < 0) { | |
146a1439 MH |
166 | if (need_dwarf) { |
167 | pr_warning("Failed to open debuginfo file.\n"); | |
168 | return fd; | |
169 | } | |
4b4da7f7 MH |
170 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* Searching trace events corresponding to probe event */ | |
0e60836b | 175 | ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs); |
4b4da7f7 MH |
176 | close(fd); |
177 | ||
146a1439 | 178 | if (ntevs > 0) { /* Succeeded to find trace events */ |
0e60836b | 179 | pr_debug("find %d probe_trace_events.\n", ntevs); |
4b4da7f7 | 180 | return ntevs; |
146a1439 | 181 | } |
4b4da7f7 | 182 | |
146a1439 MH |
183 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
184 | pr_warning("Probe point '%s' not found.\n", | |
185 | synthesize_perf_probe_point(&pev->point)); | |
186 | return -ENOENT; | |
187 | } | |
188 | /* Error path : ntevs < 0 */ | |
15eca306 MH |
189 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
190 | if (ntevs == -EBADF) { | |
191 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
192 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
193 | if (!need_dwarf) { | |
194 | pr_debug("Trying to use symbols.\nn"); | |
195 | return 0; | |
196 | } | |
4b4da7f7 | 197 | } |
15eca306 | 198 | return ntevs; |
4b4da7f7 MH |
199 | } |
200 | ||
7cf0b79e MH |
201 | /* |
202 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
203 | * and chop off leading directories that do not exist. Result is passed back as | |
204 | * a newly allocated path on success. | |
205 | * Return 0 if file was found and readable, -errno otherwise. | |
206 | */ | |
6a330a3c MH |
207 | static int get_real_path(const char *raw_path, const char *comp_dir, |
208 | char **new_path) | |
7cf0b79e | 209 | { |
6a330a3c MH |
210 | const char *prefix = symbol_conf.source_prefix; |
211 | ||
212 | if (!prefix) { | |
213 | if (raw_path[0] != '/' && comp_dir) | |
214 | /* If not an absolute path, try to use comp_dir */ | |
215 | prefix = comp_dir; | |
216 | else { | |
217 | if (access(raw_path, R_OK) == 0) { | |
218 | *new_path = strdup(raw_path); | |
219 | return 0; | |
220 | } else | |
221 | return -errno; | |
222 | } | |
7cf0b79e MH |
223 | } |
224 | ||
6a330a3c | 225 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); |
7cf0b79e MH |
226 | if (!*new_path) |
227 | return -ENOMEM; | |
228 | ||
229 | for (;;) { | |
6a330a3c | 230 | sprintf(*new_path, "%s/%s", prefix, raw_path); |
7cf0b79e MH |
231 | |
232 | if (access(*new_path, R_OK) == 0) | |
233 | return 0; | |
234 | ||
6a330a3c MH |
235 | if (!symbol_conf.source_prefix) |
236 | /* In case of searching comp_dir, don't retry */ | |
237 | return -errno; | |
238 | ||
7cf0b79e MH |
239 | switch (errno) { |
240 | case ENAMETOOLONG: | |
241 | case ENOENT: | |
242 | case EROFS: | |
243 | case EFAULT: | |
244 | raw_path = strchr(++raw_path, '/'); | |
245 | if (!raw_path) { | |
246 | free(*new_path); | |
247 | *new_path = NULL; | |
248 | return -ENOENT; | |
249 | } | |
250 | continue; | |
251 | ||
252 | default: | |
253 | free(*new_path); | |
254 | *new_path = NULL; | |
255 | return -errno; | |
256 | } | |
257 | } | |
258 | } | |
259 | ||
4b4da7f7 MH |
260 | #define LINEBUF_SIZE 256 |
261 | #define NR_ADDITIONAL_LINES 2 | |
262 | ||
d3b63d7a | 263 | static int show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 MH |
264 | { |
265 | char buf[LINEBUF_SIZE]; | |
266 | const char *color = PERF_COLOR_BLUE; | |
267 | ||
268 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
269 | goto error; | |
270 | if (!skip) { | |
271 | if (show_num) | |
d3b63d7a | 272 | fprintf(stdout, "%7d %s", l, buf); |
4b4da7f7 MH |
273 | else |
274 | color_fprintf(stdout, color, " %s", buf); | |
275 | } | |
276 | ||
277 | while (strlen(buf) == LINEBUF_SIZE - 1 && | |
278 | buf[LINEBUF_SIZE - 2] != '\n') { | |
279 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
280 | goto error; | |
281 | if (!skip) { | |
282 | if (show_num) | |
283 | fprintf(stdout, "%s", buf); | |
284 | else | |
285 | color_fprintf(stdout, color, "%s", buf); | |
286 | } | |
287 | } | |
146a1439 MH |
288 | |
289 | return 0; | |
4b4da7f7 MH |
290 | error: |
291 | if (feof(fp)) | |
146a1439 | 292 | pr_warning("Source file is shorter than expected.\n"); |
4b4da7f7 | 293 | else |
146a1439 MH |
294 | pr_warning("File read error: %s\n", strerror(errno)); |
295 | ||
296 | return -1; | |
4b4da7f7 MH |
297 | } |
298 | ||
299 | /* | |
300 | * Show line-range always requires debuginfo to find source file and | |
301 | * line number. | |
302 | */ | |
146a1439 | 303 | int show_line_range(struct line_range *lr) |
4b4da7f7 | 304 | { |
d3b63d7a | 305 | int l = 1; |
4b4da7f7 MH |
306 | struct line_node *ln; |
307 | FILE *fp; | |
308 | int fd, ret; | |
7cf0b79e | 309 | char *tmp; |
4b4da7f7 MH |
310 | |
311 | /* Search a line range */ | |
146a1439 MH |
312 | ret = init_vmlinux(); |
313 | if (ret < 0) | |
314 | return ret; | |
315 | ||
4b4da7f7 | 316 | fd = open_vmlinux(); |
146a1439 MH |
317 | if (fd < 0) { |
318 | pr_warning("Failed to open debuginfo file.\n"); | |
319 | return fd; | |
320 | } | |
321 | ||
4b4da7f7 | 322 | ret = find_line_range(fd, lr); |
4b4da7f7 | 323 | close(fd); |
146a1439 MH |
324 | if (ret == 0) { |
325 | pr_warning("Specified source line is not found.\n"); | |
326 | return -ENOENT; | |
327 | } else if (ret < 0) { | |
328 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); | |
329 | return ret; | |
330 | } | |
4b4da7f7 | 331 | |
7cf0b79e MH |
332 | /* Convert source file path */ |
333 | tmp = lr->path; | |
6a330a3c | 334 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
7cf0b79e MH |
335 | free(tmp); /* Free old path */ |
336 | if (ret < 0) { | |
337 | pr_warning("Failed to find source file. (%d)\n", ret); | |
338 | return ret; | |
339 | } | |
340 | ||
4b4da7f7 MH |
341 | setup_pager(); |
342 | ||
343 | if (lr->function) | |
344 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
345 | lr->start - lr->offset); | |
346 | else | |
347 | fprintf(stdout, "<%s:%d>\n", lr->file, lr->start); | |
348 | ||
349 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
350 | if (fp == NULL) { |
351 | pr_warning("Failed to open %s: %s\n", lr->path, | |
352 | strerror(errno)); | |
353 | return -errno; | |
354 | } | |
4b4da7f7 | 355 | /* Skip to starting line number */ |
146a1439 MH |
356 | while (l < lr->start && ret >= 0) |
357 | ret = show_one_line(fp, l++, true, false); | |
358 | if (ret < 0) | |
359 | goto end; | |
4b4da7f7 MH |
360 | |
361 | list_for_each_entry(ln, &lr->line_list, list) { | |
146a1439 MH |
362 | while (ln->line > l && ret >= 0) |
363 | ret = show_one_line(fp, (l++) - lr->offset, | |
364 | false, false); | |
365 | if (ret >= 0) | |
366 | ret = show_one_line(fp, (l++) - lr->offset, | |
367 | false, true); | |
368 | if (ret < 0) | |
369 | goto end; | |
4b4da7f7 MH |
370 | } |
371 | ||
372 | if (lr->end == INT_MAX) | |
373 | lr->end = l + NR_ADDITIONAL_LINES; | |
dda4ab34 | 374 | while (l <= lr->end && !feof(fp) && ret >= 0) |
146a1439 MH |
375 | ret = show_one_line(fp, (l++) - lr->offset, false, false); |
376 | end: | |
4b4da7f7 | 377 | fclose(fp); |
146a1439 | 378 | return ret; |
4b4da7f7 MH |
379 | } |
380 | ||
cf6eb489 | 381 | static int show_available_vars_at(int fd, struct perf_probe_event *pev, |
fb8c5a56 | 382 | int max_vls, bool externs) |
cf6eb489 MH |
383 | { |
384 | char *buf; | |
385 | int ret, i; | |
386 | struct str_node *node; | |
387 | struct variable_list *vls = NULL, *vl; | |
388 | ||
389 | buf = synthesize_perf_probe_point(&pev->point); | |
390 | if (!buf) | |
391 | return -EINVAL; | |
392 | pr_debug("Searching variables at %s\n", buf); | |
393 | ||
fb8c5a56 | 394 | ret = find_available_vars_at(fd, pev, &vls, max_vls, externs); |
cf6eb489 MH |
395 | if (ret > 0) { |
396 | /* Some variables were found */ | |
397 | fprintf(stdout, "Available variables at %s\n", buf); | |
398 | for (i = 0; i < ret; i++) { | |
399 | vl = &vls[i]; | |
400 | /* | |
401 | * A probe point might be converted to | |
402 | * several trace points. | |
403 | */ | |
404 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
405 | vl->point.offset); | |
406 | free(vl->point.symbol); | |
407 | if (vl->vars) { | |
408 | strlist__for_each(node, vl->vars) | |
409 | fprintf(stdout, "\t\t%s\n", node->s); | |
410 | strlist__delete(vl->vars); | |
411 | } else | |
412 | fprintf(stdout, "(No variables)\n"); | |
413 | } | |
414 | free(vls); | |
415 | } else | |
416 | pr_err("Failed to find variables at %s (%d)\n", buf, ret); | |
417 | ||
418 | free(buf); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | /* Show available variables on given probe point */ | |
423 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
fb8c5a56 | 424 | int max_vls, bool externs) |
cf6eb489 MH |
425 | { |
426 | int i, fd, ret = 0; | |
427 | ||
428 | ret = init_vmlinux(); | |
429 | if (ret < 0) | |
430 | return ret; | |
431 | ||
432 | fd = open_vmlinux(); | |
433 | if (fd < 0) { | |
434 | pr_warning("Failed to open debuginfo file.\n"); | |
435 | return fd; | |
436 | } | |
437 | ||
438 | setup_pager(); | |
439 | ||
440 | for (i = 0; i < npevs && ret >= 0; i++) | |
fb8c5a56 | 441 | ret = show_available_vars_at(fd, &pevs[i], max_vls, externs); |
cf6eb489 MH |
442 | |
443 | close(fd); | |
444 | return ret; | |
445 | } | |
446 | ||
4b4da7f7 MH |
447 | #else /* !DWARF_SUPPORT */ |
448 | ||
0e60836b SD |
449 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, |
450 | struct perf_probe_point *pp) | |
4b4da7f7 | 451 | { |
02b95dad MH |
452 | pp->function = strdup(tp->symbol); |
453 | if (pp->function == NULL) | |
454 | return -ENOMEM; | |
4b4da7f7 MH |
455 | pp->offset = tp->offset; |
456 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
457 | |
458 | return 0; | |
4b4da7f7 MH |
459 | } |
460 | ||
0e60836b SD |
461 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
462 | struct probe_trace_event **tevs __unused, | |
ef4a3565 | 463 | int max_tevs __unused) |
4b4da7f7 | 464 | { |
146a1439 MH |
465 | if (perf_probe_event_need_dwarf(pev)) { |
466 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
467 | return -ENOSYS; | |
468 | } | |
4b4da7f7 MH |
469 | return 0; |
470 | } | |
471 | ||
146a1439 | 472 | int show_line_range(struct line_range *lr __unused) |
4b4da7f7 | 473 | { |
146a1439 MH |
474 | pr_warning("Debuginfo-analysis is not supported.\n"); |
475 | return -ENOSYS; | |
4b4da7f7 MH |
476 | } |
477 | ||
cf6eb489 MH |
478 | int show_available_vars(struct perf_probe_event *pevs __unused, |
479 | int npevs __unused, int max_probe_points __unused) | |
480 | { | |
481 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
482 | return -ENOSYS; | |
483 | } | |
e0faa8d3 MH |
484 | #endif |
485 | ||
146a1439 | 486 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def MH |
487 | { |
488 | const char *ptr; | |
489 | char *tmp; | |
490 | /* | |
491 | * <Syntax> | |
492 | * SRC:SLN[+NUM|-ELN] | |
493 | * FUNC[:SLN[+NUM|-ELN]] | |
494 | */ | |
495 | ptr = strchr(arg, ':'); | |
496 | if (ptr) { | |
d3b63d7a | 497 | lr->start = (int)strtoul(ptr + 1, &tmp, 0); |
dda4ab34 | 498 | if (*tmp == '+') { |
d3b63d7a | 499 | lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0); |
dda4ab34 MH |
500 | lr->end--; /* |
501 | * Adjust the number of lines here. | |
502 | * If the number of lines == 1, the | |
503 | * the end of line should be equal to | |
504 | * the start of line. | |
505 | */ | |
506 | } else if (*tmp == '-') | |
d3b63d7a | 507 | lr->end = (int)strtoul(tmp + 1, &tmp, 0); |
631c9def | 508 | else |
d3b63d7a MH |
509 | lr->end = INT_MAX; |
510 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); | |
511 | if (lr->start > lr->end) { | |
631c9def | 512 | semantic_error("Start line must be smaller" |
146a1439 MH |
513 | " than end line.\n"); |
514 | return -EINVAL; | |
515 | } | |
516 | if (*tmp != '\0') { | |
517 | semantic_error("Tailing with invalid character '%d'.\n", | |
631c9def | 518 | *tmp); |
146a1439 MH |
519 | return -EINVAL; |
520 | } | |
02b95dad | 521 | tmp = strndup(arg, (ptr - arg)); |
d3b63d7a | 522 | } else { |
02b95dad | 523 | tmp = strdup(arg); |
d3b63d7a MH |
524 | lr->end = INT_MAX; |
525 | } | |
02b95dad MH |
526 | |
527 | if (tmp == NULL) | |
528 | return -ENOMEM; | |
631c9def MH |
529 | |
530 | if (strchr(tmp, '.')) | |
531 | lr->file = tmp; | |
532 | else | |
533 | lr->function = tmp; | |
146a1439 MH |
534 | |
535 | return 0; | |
631c9def MH |
536 | } |
537 | ||
b7702a21 MH |
538 | /* Check the name is good for event/group */ |
539 | static bool check_event_name(const char *name) | |
540 | { | |
541 | if (!isalpha(*name) && *name != '_') | |
542 | return false; | |
543 | while (*++name != '\0') { | |
544 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
545 | return false; | |
546 | } | |
547 | return true; | |
548 | } | |
549 | ||
50656eec | 550 | /* Parse probepoint definition. */ |
146a1439 | 551 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 552 | { |
4235b045 | 553 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
554 | char *ptr, *tmp; |
555 | char c, nc = 0; | |
556 | /* | |
557 | * <Syntax> | |
2a9c8c36 MH |
558 | * perf probe [EVENT=]SRC[:LN|;PTN] |
559 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
560 | * |
561 | * TODO:Group name support | |
50656eec MH |
562 | */ |
563 | ||
2a9c8c36 MH |
564 | ptr = strpbrk(arg, ";=@+%"); |
565 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
566 | *ptr = '\0'; |
567 | tmp = ptr + 1; | |
146a1439 MH |
568 | if (strchr(arg, ':')) { |
569 | semantic_error("Group name is not supported yet.\n"); | |
570 | return -ENOTSUP; | |
571 | } | |
572 | if (!check_event_name(arg)) { | |
b7702a21 | 573 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
574 | "follow C symbol-naming rule.\n", arg); |
575 | return -EINVAL; | |
576 | } | |
02b95dad MH |
577 | pev->event = strdup(arg); |
578 | if (pev->event == NULL) | |
579 | return -ENOMEM; | |
4235b045 | 580 | pev->group = NULL; |
af663d75 MH |
581 | arg = tmp; |
582 | } | |
583 | ||
2a9c8c36 | 584 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
585 | if (ptr) { |
586 | nc = *ptr; | |
587 | *ptr++ = '\0'; | |
588 | } | |
589 | ||
02b95dad MH |
590 | tmp = strdup(arg); |
591 | if (tmp == NULL) | |
592 | return -ENOMEM; | |
593 | ||
50656eec | 594 | /* Check arg is function or file and copy it */ |
02b95dad MH |
595 | if (strchr(tmp, '.')) /* File */ |
596 | pp->file = tmp; | |
50656eec | 597 | else /* Function */ |
02b95dad | 598 | pp->function = tmp; |
50656eec MH |
599 | |
600 | /* Parse other options */ | |
601 | while (ptr) { | |
602 | arg = ptr; | |
603 | c = nc; | |
2a9c8c36 | 604 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
605 | pp->lazy_line = strdup(arg); |
606 | if (pp->lazy_line == NULL) | |
607 | return -ENOMEM; | |
2a9c8c36 MH |
608 | break; |
609 | } | |
610 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
611 | if (ptr) { |
612 | nc = *ptr; | |
613 | *ptr++ = '\0'; | |
614 | } | |
615 | switch (c) { | |
616 | case ':': /* Line number */ | |
617 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 618 | if (*tmp != '\0') { |
2a9c8c36 | 619 | semantic_error("There is non-digit char" |
146a1439 MH |
620 | " in line number.\n"); |
621 | return -EINVAL; | |
622 | } | |
50656eec MH |
623 | break; |
624 | case '+': /* Byte offset from a symbol */ | |
625 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 626 | if (*tmp != '\0') { |
2a9c8c36 | 627 | semantic_error("There is non-digit character" |
146a1439 MH |
628 | " in offset.\n"); |
629 | return -EINVAL; | |
630 | } | |
50656eec MH |
631 | break; |
632 | case '@': /* File name */ | |
146a1439 MH |
633 | if (pp->file) { |
634 | semantic_error("SRC@SRC is not allowed.\n"); | |
635 | return -EINVAL; | |
636 | } | |
02b95dad MH |
637 | pp->file = strdup(arg); |
638 | if (pp->file == NULL) | |
639 | return -ENOMEM; | |
50656eec MH |
640 | break; |
641 | case '%': /* Probe places */ | |
642 | if (strcmp(arg, "return") == 0) { | |
643 | pp->retprobe = 1; | |
146a1439 MH |
644 | } else { /* Others not supported yet */ |
645 | semantic_error("%%%s is not supported.\n", arg); | |
646 | return -ENOTSUP; | |
647 | } | |
50656eec | 648 | break; |
146a1439 MH |
649 | default: /* Buggy case */ |
650 | pr_err("This program has a bug at %s:%d.\n", | |
651 | __FILE__, __LINE__); | |
652 | return -ENOTSUP; | |
50656eec MH |
653 | break; |
654 | } | |
655 | } | |
656 | ||
657 | /* Exclusion check */ | |
146a1439 | 658 | if (pp->lazy_line && pp->line) { |
2a9c8c36 | 659 | semantic_error("Lazy pattern can't be used with line number."); |
146a1439 MH |
660 | return -EINVAL; |
661 | } | |
2a9c8c36 | 662 | |
146a1439 | 663 | if (pp->lazy_line && pp->offset) { |
2a9c8c36 | 664 | semantic_error("Lazy pattern can't be used with offset."); |
146a1439 MH |
665 | return -EINVAL; |
666 | } | |
2a9c8c36 | 667 | |
146a1439 | 668 | if (pp->line && pp->offset) { |
50656eec | 669 | semantic_error("Offset can't be used with line number."); |
146a1439 MH |
670 | return -EINVAL; |
671 | } | |
50656eec | 672 | |
146a1439 | 673 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 MH |
674 | semantic_error("File always requires line number or " |
675 | "lazy pattern."); | |
146a1439 MH |
676 | return -EINVAL; |
677 | } | |
50656eec | 678 | |
146a1439 | 679 | if (pp->offset && !pp->function) { |
50656eec | 680 | semantic_error("Offset requires an entry function."); |
146a1439 MH |
681 | return -EINVAL; |
682 | } | |
50656eec | 683 | |
146a1439 | 684 | if (pp->retprobe && !pp->function) { |
50656eec | 685 | semantic_error("Return probe requires an entry function."); |
146a1439 MH |
686 | return -EINVAL; |
687 | } | |
50656eec | 688 | |
146a1439 | 689 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 MH |
690 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
691 | "return probe."); | |
146a1439 MH |
692 | return -EINVAL; |
693 | } | |
50656eec | 694 | |
4235b045 | 695 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
696 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
697 | pp->lazy_line); | |
146a1439 | 698 | return 0; |
50656eec MH |
699 | } |
700 | ||
7df2f329 | 701 | /* Parse perf-probe event argument */ |
146a1439 | 702 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 703 | { |
b2a3c12b | 704 | char *tmp, *goodname; |
7df2f329 MH |
705 | struct perf_probe_arg_field **fieldp; |
706 | ||
707 | pr_debug("parsing arg: %s into ", str); | |
708 | ||
48481938 MH |
709 | tmp = strchr(str, '='); |
710 | if (tmp) { | |
02b95dad MH |
711 | arg->name = strndup(str, tmp - str); |
712 | if (arg->name == NULL) | |
713 | return -ENOMEM; | |
11a1ca35 | 714 | pr_debug("name:%s ", arg->name); |
48481938 MH |
715 | str = tmp + 1; |
716 | } | |
717 | ||
11a1ca35 MH |
718 | tmp = strchr(str, ':'); |
719 | if (tmp) { /* Type setting */ | |
720 | *tmp = '\0'; | |
02b95dad MH |
721 | arg->type = strdup(tmp + 1); |
722 | if (arg->type == NULL) | |
723 | return -ENOMEM; | |
11a1ca35 MH |
724 | pr_debug("type:%s ", arg->type); |
725 | } | |
726 | ||
b2a3c12b | 727 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
728 | if (!is_c_varname(str) || !tmp) { |
729 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
730 | arg->var = strdup(str); |
731 | if (arg->var == NULL) | |
732 | return -ENOMEM; | |
48481938 | 733 | pr_debug("%s\n", arg->var); |
146a1439 | 734 | return 0; |
7df2f329 MH |
735 | } |
736 | ||
b2a3c12b | 737 | /* Structure fields or array element */ |
02b95dad MH |
738 | arg->var = strndup(str, tmp - str); |
739 | if (arg->var == NULL) | |
740 | return -ENOMEM; | |
b2a3c12b | 741 | goodname = arg->var; |
48481938 | 742 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
743 | fieldp = &arg->field; |
744 | ||
745 | do { | |
e334016f MH |
746 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
747 | if (*fieldp == NULL) | |
748 | return -ENOMEM; | |
b2a3c12b MH |
749 | if (*tmp == '[') { /* Array */ |
750 | str = tmp; | |
751 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 752 | (*fieldp)->ref = true; |
b2a3c12b MH |
753 | if (*tmp != ']' || tmp == str + 1) { |
754 | semantic_error("Array index must be a" | |
755 | " number.\n"); | |
756 | return -EINVAL; | |
757 | } | |
758 | tmp++; | |
759 | if (*tmp == '\0') | |
760 | tmp = NULL; | |
761 | } else { /* Structure */ | |
762 | if (*tmp == '.') { | |
763 | str = tmp + 1; | |
764 | (*fieldp)->ref = false; | |
765 | } else if (tmp[1] == '>') { | |
766 | str = tmp + 2; | |
767 | (*fieldp)->ref = true; | |
768 | } else { | |
769 | semantic_error("Argument parse error: %s\n", | |
770 | str); | |
771 | return -EINVAL; | |
772 | } | |
773 | tmp = strpbrk(str, "-.["); | |
146a1439 | 774 | } |
7df2f329 | 775 | if (tmp) { |
02b95dad MH |
776 | (*fieldp)->name = strndup(str, tmp - str); |
777 | if ((*fieldp)->name == NULL) | |
778 | return -ENOMEM; | |
b2a3c12b MH |
779 | if (*str != '[') |
780 | goodname = (*fieldp)->name; | |
7df2f329 MH |
781 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
782 | fieldp = &(*fieldp)->next; | |
783 | } | |
784 | } while (tmp); | |
02b95dad MH |
785 | (*fieldp)->name = strdup(str); |
786 | if ((*fieldp)->name == NULL) | |
787 | return -ENOMEM; | |
b2a3c12b MH |
788 | if (*str != '[') |
789 | goodname = (*fieldp)->name; | |
7df2f329 | 790 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 791 | |
b2a3c12b | 792 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 793 | if (!arg->name) { |
b2a3c12b | 794 | arg->name = strdup(goodname); |
02b95dad MH |
795 | if (arg->name == NULL) |
796 | return -ENOMEM; | |
797 | } | |
146a1439 | 798 | return 0; |
7df2f329 MH |
799 | } |
800 | ||
4235b045 | 801 | /* Parse perf-probe event command */ |
146a1439 | 802 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 803 | { |
e1c01d61 | 804 | char **argv; |
146a1439 | 805 | int argc, i, ret = 0; |
fac13fd5 | 806 | |
4235b045 | 807 | argv = argv_split(cmd, &argc); |
146a1439 MH |
808 | if (!argv) { |
809 | pr_debug("Failed to split arguments.\n"); | |
810 | return -ENOMEM; | |
811 | } | |
812 | if (argc - 1 > MAX_PROBE_ARGS) { | |
813 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
814 | ret = -ERANGE; | |
815 | goto out; | |
816 | } | |
50656eec | 817 | /* Parse probe point */ |
146a1439 MH |
818 | ret = parse_perf_probe_point(argv[0], pev); |
819 | if (ret < 0) | |
820 | goto out; | |
50656eec | 821 | |
e1c01d61 | 822 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 823 | pev->nargs = argc - 1; |
e334016f MH |
824 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
825 | if (pev->args == NULL) { | |
826 | ret = -ENOMEM; | |
827 | goto out; | |
828 | } | |
146a1439 MH |
829 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
830 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
831 | if (ret >= 0 && | |
832 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 833 | semantic_error("You can't specify local variable for" |
146a1439 MH |
834 | " kretprobe.\n"); |
835 | ret = -EINVAL; | |
836 | } | |
e1c01d61 | 837 | } |
146a1439 | 838 | out: |
e1c01d61 | 839 | argv_free(argv); |
146a1439 MH |
840 | |
841 | return ret; | |
50656eec MH |
842 | } |
843 | ||
4235b045 MH |
844 | /* Return true if this perf_probe_event requires debuginfo */ |
845 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
846 | { | |
847 | int i; | |
848 | ||
849 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
850 | return true; | |
851 | ||
852 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 853 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
854 | return true; |
855 | ||
856 | return false; | |
857 | } | |
858 | ||
0e60836b SD |
859 | /* Parse probe_events event into struct probe_point */ |
860 | static int parse_probe_trace_command(const char *cmd, | |
861 | struct probe_trace_event *tev) | |
4de189fe | 862 | { |
0e60836b | 863 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
864 | char pr; |
865 | char *p; | |
866 | int ret, i, argc; | |
867 | char **argv; | |
868 | ||
0e60836b | 869 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 870 | argv = argv_split(cmd, &argc); |
146a1439 MH |
871 | if (!argv) { |
872 | pr_debug("Failed to split arguments.\n"); | |
873 | return -ENOMEM; | |
874 | } | |
875 | if (argc < 2) { | |
876 | semantic_error("Too few probe arguments.\n"); | |
877 | ret = -ERANGE; | |
878 | goto out; | |
879 | } | |
4de189fe MH |
880 | |
881 | /* Scan event and group name. */ | |
93aaa45a | 882 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
883 | &pr, (float *)(void *)&tev->group, |
884 | (float *)(void *)&tev->event); | |
146a1439 MH |
885 | if (ret != 3) { |
886 | semantic_error("Failed to parse event name: %s\n", argv[0]); | |
887 | ret = -EINVAL; | |
888 | goto out; | |
889 | } | |
4235b045 | 890 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 891 | |
4235b045 | 892 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
893 | |
894 | /* Scan function name and offset */ | |
4235b045 MH |
895 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
896 | &tp->offset); | |
4de189fe | 897 | if (ret == 1) |
4235b045 | 898 | tp->offset = 0; |
4de189fe | 899 | |
4235b045 | 900 | tev->nargs = argc - 2; |
0e60836b | 901 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
902 | if (tev->args == NULL) { |
903 | ret = -ENOMEM; | |
904 | goto out; | |
905 | } | |
4235b045 | 906 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
907 | p = strchr(argv[i + 2], '='); |
908 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
909 | *p++ = '\0'; |
910 | else | |
911 | p = argv[i + 2]; | |
02b95dad | 912 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 913 | /* TODO: parse regs and offset */ |
02b95dad MH |
914 | tev->args[i].value = strdup(p); |
915 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
916 | ret = -ENOMEM; | |
917 | goto out; | |
918 | } | |
4de189fe | 919 | } |
146a1439 MH |
920 | ret = 0; |
921 | out: | |
4de189fe | 922 | argv_free(argv); |
146a1439 | 923 | return ret; |
4de189fe MH |
924 | } |
925 | ||
7df2f329 MH |
926 | /* Compose only probe arg */ |
927 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
928 | { | |
929 | struct perf_probe_arg_field *field = pa->field; | |
930 | int ret; | |
931 | char *tmp = buf; | |
932 | ||
48481938 MH |
933 | if (pa->name && pa->var) |
934 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
935 | else | |
936 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
937 | if (ret <= 0) |
938 | goto error; | |
939 | tmp += ret; | |
940 | len -= ret; | |
941 | ||
942 | while (field) { | |
b2a3c12b MH |
943 | if (field->name[0] == '[') |
944 | ret = e_snprintf(tmp, len, "%s", field->name); | |
945 | else | |
946 | ret = e_snprintf(tmp, len, "%s%s", | |
947 | field->ref ? "->" : ".", field->name); | |
7df2f329 MH |
948 | if (ret <= 0) |
949 | goto error; | |
950 | tmp += ret; | |
951 | len -= ret; | |
952 | field = field->next; | |
953 | } | |
11a1ca35 MH |
954 | |
955 | if (pa->type) { | |
956 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
957 | if (ret <= 0) | |
958 | goto error; | |
959 | tmp += ret; | |
960 | len -= ret; | |
961 | } | |
962 | ||
7df2f329 MH |
963 | return tmp - buf; |
964 | error: | |
146a1439 MH |
965 | pr_debug("Failed to synthesize perf probe argument: %s", |
966 | strerror(-ret)); | |
967 | return ret; | |
7df2f329 MH |
968 | } |
969 | ||
4235b045 MH |
970 | /* Compose only probe point (not argument) */ |
971 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 972 | { |
fb1587d8 MH |
973 | char *buf, *tmp; |
974 | char offs[32] = "", line[32] = "", file[32] = ""; | |
975 | int ret, len; | |
4de189fe | 976 | |
e334016f MH |
977 | buf = zalloc(MAX_CMDLEN); |
978 | if (buf == NULL) { | |
979 | ret = -ENOMEM; | |
980 | goto error; | |
981 | } | |
4de189fe | 982 | if (pp->offset) { |
fb1587d8 | 983 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
984 | if (ret <= 0) |
985 | goto error; | |
986 | } | |
987 | if (pp->line) { | |
fb1587d8 MH |
988 | ret = e_snprintf(line, 32, ":%d", pp->line); |
989 | if (ret <= 0) | |
990 | goto error; | |
991 | } | |
992 | if (pp->file) { | |
dd259c5d | 993 | len = strlen(pp->file) - 31; |
fb1587d8 MH |
994 | if (len < 0) |
995 | len = 0; | |
996 | tmp = strchr(pp->file + len, '/'); | |
997 | if (!tmp) | |
dd259c5d | 998 | tmp = pp->file + len; |
fb1587d8 | 999 | ret = e_snprintf(file, 32, "@%s", tmp + 1); |
4de189fe MH |
1000 | if (ret <= 0) |
1001 | goto error; | |
1002 | } | |
1003 | ||
1004 | if (pp->function) | |
fb1587d8 MH |
1005 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
1006 | offs, pp->retprobe ? "%return" : "", line, | |
1007 | file); | |
4de189fe | 1008 | else |
fb1587d8 | 1009 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
1010 | if (ret <= 0) |
1011 | goto error; | |
1012 | ||
1013 | return buf; | |
7ef17aaf | 1014 | error: |
146a1439 MH |
1015 | pr_debug("Failed to synthesize perf probe point: %s", |
1016 | strerror(-ret)); | |
e334016f MH |
1017 | if (buf) |
1018 | free(buf); | |
146a1439 | 1019 | return NULL; |
7ef17aaf MH |
1020 | } |
1021 | ||
4235b045 MH |
1022 | #if 0 |
1023 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
1024 | { |
1025 | char *buf; | |
1026 | int i, len, ret; | |
1027 | ||
4235b045 MH |
1028 | buf = synthesize_perf_probe_point(&pev->point); |
1029 | if (!buf) | |
1030 | return NULL; | |
4de189fe | 1031 | |
4235b045 MH |
1032 | len = strlen(buf); |
1033 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 1034 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
1035 | pev->args[i].name); |
1036 | if (ret <= 0) { | |
1037 | free(buf); | |
1038 | return NULL; | |
1039 | } | |
4de189fe MH |
1040 | len += ret; |
1041 | } | |
4de189fe | 1042 | |
4235b045 MH |
1043 | return buf; |
1044 | } | |
1045 | #endif | |
1046 | ||
0e60836b | 1047 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
4235b045 MH |
1048 | char **buf, size_t *buflen, |
1049 | int depth) | |
1050 | { | |
1051 | int ret; | |
1052 | if (ref->next) { | |
0e60836b | 1053 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
4235b045 MH |
1054 | buflen, depth + 1); |
1055 | if (depth < 0) | |
1056 | goto out; | |
1057 | } | |
1058 | ||
1059 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
1060 | if (ret < 0) | |
1061 | depth = ret; | |
1062 | else { | |
1063 | *buf += ret; | |
1064 | *buflen -= ret; | |
1065 | } | |
1066 | out: | |
1067 | return depth; | |
4de189fe | 1068 | |
4de189fe MH |
1069 | } |
1070 | ||
0e60836b | 1071 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
4235b045 | 1072 | char *buf, size_t buflen) |
50656eec | 1073 | { |
0e60836b | 1074 | struct probe_trace_arg_ref *ref = arg->ref; |
4235b045 MH |
1075 | int ret, depth = 0; |
1076 | char *tmp = buf; | |
1077 | ||
1078 | /* Argument name or separator */ | |
1079 | if (arg->name) | |
1080 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
1081 | else | |
1082 | ret = e_snprintf(buf, buflen, " "); | |
1083 | if (ret < 0) | |
1084 | return ret; | |
1085 | buf += ret; | |
1086 | buflen -= ret; | |
1087 | ||
b7dcb857 MH |
1088 | /* Special case: @XXX */ |
1089 | if (arg->value[0] == '@' && arg->ref) | |
1090 | ref = ref->next; | |
1091 | ||
4235b045 | 1092 | /* Dereferencing arguments */ |
b7dcb857 | 1093 | if (ref) { |
0e60836b | 1094 | depth = __synthesize_probe_trace_arg_ref(ref, &buf, |
4235b045 MH |
1095 | &buflen, 1); |
1096 | if (depth < 0) | |
1097 | return depth; | |
1098 | } | |
1099 | ||
1100 | /* Print argument value */ | |
b7dcb857 MH |
1101 | if (arg->value[0] == '@' && arg->ref) |
1102 | ret = e_snprintf(buf, buflen, "%s%+ld", arg->value, | |
1103 | arg->ref->offset); | |
1104 | else | |
1105 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
4235b045 MH |
1106 | if (ret < 0) |
1107 | return ret; | |
1108 | buf += ret; | |
1109 | buflen -= ret; | |
1110 | ||
1111 | /* Closing */ | |
1112 | while (depth--) { | |
1113 | ret = e_snprintf(buf, buflen, ")"); | |
1114 | if (ret < 0) | |
1115 | return ret; | |
1116 | buf += ret; | |
1117 | buflen -= ret; | |
1118 | } | |
4984912e MH |
1119 | /* Print argument type */ |
1120 | if (arg->type) { | |
1121 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
1122 | if (ret <= 0) | |
1123 | return ret; | |
1124 | buf += ret; | |
1125 | } | |
4235b045 MH |
1126 | |
1127 | return buf - tmp; | |
1128 | } | |
1129 | ||
0e60836b | 1130 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1131 | { |
0e60836b | 1132 | struct probe_trace_point *tp = &tev->point; |
50656eec MH |
1133 | char *buf; |
1134 | int i, len, ret; | |
1135 | ||
e334016f MH |
1136 | buf = zalloc(MAX_CMDLEN); |
1137 | if (buf == NULL) | |
1138 | return NULL; | |
1139 | ||
4235b045 MH |
1140 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", |
1141 | tp->retprobe ? 'r' : 'p', | |
1142 | tev->group, tev->event, | |
1143 | tp->symbol, tp->offset); | |
1144 | if (len <= 0) | |
50656eec | 1145 | goto error; |
50656eec | 1146 | |
4235b045 | 1147 | for (i = 0; i < tev->nargs; i++) { |
0e60836b | 1148 | ret = synthesize_probe_trace_arg(&tev->args[i], buf + len, |
4235b045 | 1149 | MAX_CMDLEN - len); |
4de189fe | 1150 | if (ret <= 0) |
50656eec MH |
1151 | goto error; |
1152 | len += ret; | |
1153 | } | |
50656eec | 1154 | |
4235b045 | 1155 | return buf; |
50656eec | 1156 | error: |
4235b045 MH |
1157 | free(buf); |
1158 | return NULL; | |
1159 | } | |
50656eec | 1160 | |
0e60836b | 1161 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
146a1439 | 1162 | struct perf_probe_event *pev) |
4235b045 | 1163 | { |
02b95dad | 1164 | char buf[64] = ""; |
146a1439 | 1165 | int i, ret; |
4235b045 | 1166 | |
4b4da7f7 | 1167 | /* Convert event/group name */ |
02b95dad MH |
1168 | pev->event = strdup(tev->event); |
1169 | pev->group = strdup(tev->group); | |
1170 | if (pev->event == NULL || pev->group == NULL) | |
1171 | return -ENOMEM; | |
fb1587d8 | 1172 | |
4b4da7f7 | 1173 | /* Convert trace_point to probe_point */ |
0e60836b | 1174 | ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point); |
146a1439 MH |
1175 | if (ret < 0) |
1176 | return ret; | |
4b4da7f7 | 1177 | |
4235b045 MH |
1178 | /* Convert trace_arg to probe_arg */ |
1179 | pev->nargs = tev->nargs; | |
e334016f MH |
1180 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1181 | if (pev->args == NULL) | |
1182 | return -ENOMEM; | |
02b95dad | 1183 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1184 | if (tev->args[i].name) |
02b95dad | 1185 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1186 | else { |
0e60836b | 1187 | ret = synthesize_probe_trace_arg(&tev->args[i], |
146a1439 | 1188 | buf, 64); |
02b95dad | 1189 | pev->args[i].name = strdup(buf); |
4235b045 | 1190 | } |
02b95dad MH |
1191 | if (pev->args[i].name == NULL && ret >= 0) |
1192 | ret = -ENOMEM; | |
1193 | } | |
146a1439 MH |
1194 | |
1195 | if (ret < 0) | |
1196 | clear_perf_probe_event(pev); | |
1197 | ||
1198 | return ret; | |
4235b045 MH |
1199 | } |
1200 | ||
1201 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
1202 | { | |
1203 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 1204 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
1205 | int i; |
1206 | ||
1207 | if (pev->event) | |
1208 | free(pev->event); | |
1209 | if (pev->group) | |
1210 | free(pev->group); | |
1211 | if (pp->file) | |
1212 | free(pp->file); | |
1213 | if (pp->function) | |
1214 | free(pp->function); | |
1215 | if (pp->lazy_line) | |
1216 | free(pp->lazy_line); | |
7df2f329 | 1217 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
1218 | if (pev->args[i].name) |
1219 | free(pev->args[i].name); | |
48481938 MH |
1220 | if (pev->args[i].var) |
1221 | free(pev->args[i].var); | |
11a1ca35 MH |
1222 | if (pev->args[i].type) |
1223 | free(pev->args[i].type); | |
7df2f329 MH |
1224 | field = pev->args[i].field; |
1225 | while (field) { | |
1226 | next = field->next; | |
1227 | if (field->name) | |
1228 | free(field->name); | |
1229 | free(field); | |
1230 | field = next; | |
1231 | } | |
1232 | } | |
4235b045 MH |
1233 | if (pev->args) |
1234 | free(pev->args); | |
1235 | memset(pev, 0, sizeof(*pev)); | |
1236 | } | |
1237 | ||
0e60836b | 1238 | static void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 1239 | { |
0e60836b | 1240 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
1241 | int i; |
1242 | ||
1243 | if (tev->event) | |
1244 | free(tev->event); | |
1245 | if (tev->group) | |
1246 | free(tev->group); | |
1247 | if (tev->point.symbol) | |
1248 | free(tev->point.symbol); | |
1249 | for (i = 0; i < tev->nargs; i++) { | |
1250 | if (tev->args[i].name) | |
1251 | free(tev->args[i].name); | |
1252 | if (tev->args[i].value) | |
1253 | free(tev->args[i].value); | |
4984912e MH |
1254 | if (tev->args[i].type) |
1255 | free(tev->args[i].type); | |
4235b045 MH |
1256 | ref = tev->args[i].ref; |
1257 | while (ref) { | |
1258 | next = ref->next; | |
1259 | free(ref); | |
1260 | ref = next; | |
1261 | } | |
1262 | } | |
1263 | if (tev->args) | |
1264 | free(tev->args); | |
1265 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
1266 | } |
1267 | ||
f4d7da49 | 1268 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
1269 | { |
1270 | char buf[PATH_MAX]; | |
7ca5989d | 1271 | const char *__debugfs; |
4de189fe MH |
1272 | int ret; |
1273 | ||
7ca5989d MH |
1274 | __debugfs = debugfs_find_mountpoint(); |
1275 | if (__debugfs == NULL) { | |
1276 | pr_warning("Debugfs is not mounted.\n"); | |
1277 | return -ENOENT; | |
1278 | } | |
1279 | ||
1280 | ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs); | |
146a1439 | 1281 | if (ret >= 0) { |
7ca5989d | 1282 | pr_debug("Opening %s write=%d\n", buf, readwrite); |
146a1439 MH |
1283 | if (readwrite && !probe_event_dry_run) |
1284 | ret = open(buf, O_RDWR, O_APPEND); | |
1285 | else | |
1286 | ret = open(buf, O_RDONLY, 0); | |
1287 | } | |
f4d7da49 | 1288 | |
4de189fe MH |
1289 | if (ret < 0) { |
1290 | if (errno == ENOENT) | |
146a1439 MH |
1291 | pr_warning("kprobe_events file does not exist - please" |
1292 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); | |
4de189fe | 1293 | else |
146a1439 MH |
1294 | pr_warning("Failed to open kprobe_events file: %s\n", |
1295 | strerror(errno)); | |
4de189fe MH |
1296 | } |
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | /* Get raw string list of current kprobe_events */ | |
0e60836b | 1301 | static struct strlist *get_probe_trace_command_rawlist(int fd) |
4de189fe MH |
1302 | { |
1303 | int ret, idx; | |
1304 | FILE *fp; | |
1305 | char buf[MAX_CMDLEN]; | |
1306 | char *p; | |
1307 | struct strlist *sl; | |
1308 | ||
1309 | sl = strlist__new(true, NULL); | |
1310 | ||
1311 | fp = fdopen(dup(fd), "r"); | |
1312 | while (!feof(fp)) { | |
1313 | p = fgets(buf, MAX_CMDLEN, fp); | |
1314 | if (!p) | |
1315 | break; | |
1316 | ||
1317 | idx = strlen(p) - 1; | |
1318 | if (p[idx] == '\n') | |
1319 | p[idx] = '\0'; | |
1320 | ret = strlist__add(sl, buf); | |
146a1439 MH |
1321 | if (ret < 0) { |
1322 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); | |
1323 | strlist__delete(sl); | |
1324 | return NULL; | |
1325 | } | |
4de189fe MH |
1326 | } |
1327 | fclose(fp); | |
1328 | ||
1329 | return sl; | |
1330 | } | |
1331 | ||
278498d4 | 1332 | /* Show an event */ |
146a1439 | 1333 | static int show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 1334 | { |
7e990a51 | 1335 | int i, ret; |
278498d4 | 1336 | char buf[128]; |
4235b045 | 1337 | char *place; |
278498d4 | 1338 | |
4235b045 MH |
1339 | /* Synthesize only event probe point */ |
1340 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
1341 | if (!place) |
1342 | return -EINVAL; | |
4235b045 MH |
1343 | |
1344 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 | 1345 | if (ret < 0) |
146a1439 MH |
1346 | return ret; |
1347 | ||
fb1587d8 | 1348 | printf(" %-20s (on %s", buf, place); |
278498d4 | 1349 | |
4235b045 | 1350 | if (pev->nargs > 0) { |
278498d4 | 1351 | printf(" with"); |
7df2f329 | 1352 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
1353 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1354 | buf, 128); | |
1355 | if (ret < 0) | |
1356 | break; | |
7df2f329 MH |
1357 | printf(" %s", buf); |
1358 | } | |
278498d4 MH |
1359 | } |
1360 | printf(")\n"); | |
4235b045 | 1361 | free(place); |
146a1439 | 1362 | return ret; |
278498d4 MH |
1363 | } |
1364 | ||
4de189fe | 1365 | /* List up current perf-probe events */ |
146a1439 | 1366 | int show_perf_probe_events(void) |
4de189fe | 1367 | { |
146a1439 | 1368 | int fd, ret; |
0e60836b | 1369 | struct probe_trace_event tev; |
4235b045 | 1370 | struct perf_probe_event pev; |
4de189fe MH |
1371 | struct strlist *rawlist; |
1372 | struct str_node *ent; | |
1373 | ||
72041334 | 1374 | setup_pager(); |
146a1439 MH |
1375 | ret = init_vmlinux(); |
1376 | if (ret < 0) | |
1377 | return ret; | |
4235b045 MH |
1378 | |
1379 | memset(&tev, 0, sizeof(tev)); | |
1380 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 1381 | |
f4d7da49 | 1382 | fd = open_kprobe_events(false); |
146a1439 MH |
1383 | if (fd < 0) |
1384 | return fd; | |
1385 | ||
0e60836b | 1386 | rawlist = get_probe_trace_command_rawlist(fd); |
4de189fe | 1387 | close(fd); |
146a1439 MH |
1388 | if (!rawlist) |
1389 | return -ENOENT; | |
4de189fe | 1390 | |
adf365f4 | 1391 | strlist__for_each(ent, rawlist) { |
0e60836b | 1392 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1393 | if (ret >= 0) { |
1394 | ret = convert_to_perf_probe_event(&tev, &pev); | |
1395 | if (ret >= 0) | |
1396 | ret = show_perf_probe_event(&pev); | |
1397 | } | |
4235b045 | 1398 | clear_perf_probe_event(&pev); |
0e60836b | 1399 | clear_probe_trace_event(&tev); |
146a1439 MH |
1400 | if (ret < 0) |
1401 | break; | |
4de189fe | 1402 | } |
4de189fe | 1403 | strlist__delete(rawlist); |
146a1439 MH |
1404 | |
1405 | return ret; | |
4de189fe MH |
1406 | } |
1407 | ||
b498ce1f | 1408 | /* Get current perf-probe event names */ |
0e60836b | 1409 | static struct strlist *get_probe_trace_event_names(int fd, bool include_group) |
b498ce1f | 1410 | { |
fa28244d | 1411 | char buf[128]; |
b498ce1f MH |
1412 | struct strlist *sl, *rawlist; |
1413 | struct str_node *ent; | |
0e60836b | 1414 | struct probe_trace_event tev; |
146a1439 | 1415 | int ret = 0; |
b498ce1f | 1416 | |
4235b045 | 1417 | memset(&tev, 0, sizeof(tev)); |
0e60836b | 1418 | rawlist = get_probe_trace_command_rawlist(fd); |
e1d2017b | 1419 | sl = strlist__new(true, NULL); |
adf365f4 | 1420 | strlist__for_each(ent, rawlist) { |
0e60836b | 1421 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1422 | if (ret < 0) |
1423 | break; | |
fa28244d | 1424 | if (include_group) { |
146a1439 MH |
1425 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1426 | tev.event); | |
1427 | if (ret >= 0) | |
1428 | ret = strlist__add(sl, buf); | |
fa28244d | 1429 | } else |
146a1439 | 1430 | ret = strlist__add(sl, tev.event); |
0e60836b | 1431 | clear_probe_trace_event(&tev); |
146a1439 MH |
1432 | if (ret < 0) |
1433 | break; | |
b498ce1f | 1434 | } |
b498ce1f MH |
1435 | strlist__delete(rawlist); |
1436 | ||
146a1439 MH |
1437 | if (ret < 0) { |
1438 | strlist__delete(sl); | |
1439 | return NULL; | |
1440 | } | |
b498ce1f MH |
1441 | return sl; |
1442 | } | |
1443 | ||
0e60836b | 1444 | static int write_probe_trace_event(int fd, struct probe_trace_event *tev) |
50656eec | 1445 | { |
6eca8cc3 | 1446 | int ret = 0; |
0e60836b | 1447 | char *buf = synthesize_probe_trace_command(tev); |
50656eec | 1448 | |
146a1439 | 1449 | if (!buf) { |
0e60836b | 1450 | pr_debug("Failed to synthesize probe trace event.\n"); |
146a1439 MH |
1451 | return -EINVAL; |
1452 | } | |
1453 | ||
fa28244d | 1454 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1455 | if (!probe_event_dry_run) { |
1456 | ret = write(fd, buf, strlen(buf)); | |
1457 | if (ret <= 0) | |
146a1439 MH |
1458 | pr_warning("Failed to write event: %s\n", |
1459 | strerror(errno)); | |
f4d7da49 | 1460 | } |
4235b045 | 1461 | free(buf); |
146a1439 | 1462 | return ret; |
50656eec MH |
1463 | } |
1464 | ||
146a1439 MH |
1465 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1466 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
1467 | { |
1468 | int i, ret; | |
17f88fcd MH |
1469 | |
1470 | /* Try no suffix */ | |
1471 | ret = e_snprintf(buf, len, "%s", base); | |
146a1439 MH |
1472 | if (ret < 0) { |
1473 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1474 | return ret; | |
1475 | } | |
17f88fcd | 1476 | if (!strlist__has_entry(namelist, buf)) |
146a1439 | 1477 | return 0; |
17f88fcd | 1478 | |
d761b08b MH |
1479 | if (!allow_suffix) { |
1480 | pr_warning("Error: event \"%s\" already exists. " | |
1481 | "(Use -f to force duplicates.)\n", base); | |
146a1439 | 1482 | return -EEXIST; |
d761b08b MH |
1483 | } |
1484 | ||
17f88fcd MH |
1485 | /* Try to add suffix */ |
1486 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f | 1487 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
146a1439 MH |
1488 | if (ret < 0) { |
1489 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1490 | return ret; | |
1491 | } | |
b498ce1f MH |
1492 | if (!strlist__has_entry(namelist, buf)) |
1493 | break; | |
1494 | } | |
146a1439 MH |
1495 | if (i == MAX_EVENT_INDEX) { |
1496 | pr_warning("Too many events are on the same function.\n"); | |
1497 | ret = -ERANGE; | |
1498 | } | |
1499 | ||
1500 | return ret; | |
b498ce1f MH |
1501 | } |
1502 | ||
0e60836b SD |
1503 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
1504 | struct probe_trace_event *tevs, | |
146a1439 | 1505 | int ntevs, bool allow_suffix) |
50656eec | 1506 | { |
146a1439 | 1507 | int i, fd, ret; |
0e60836b | 1508 | struct probe_trace_event *tev = NULL; |
4235b045 MH |
1509 | char buf[64]; |
1510 | const char *event, *group; | |
b498ce1f | 1511 | struct strlist *namelist; |
50656eec | 1512 | |
f4d7da49 | 1513 | fd = open_kprobe_events(true); |
146a1439 MH |
1514 | if (fd < 0) |
1515 | return fd; | |
b498ce1f | 1516 | /* Get current event names */ |
0e60836b | 1517 | namelist = get_probe_trace_event_names(fd, false); |
146a1439 MH |
1518 | if (!namelist) { |
1519 | pr_debug("Failed to get current event list.\n"); | |
1520 | return -EIO; | |
1521 | } | |
4235b045 | 1522 | |
146a1439 | 1523 | ret = 0; |
4235b045 | 1524 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
02b95dad | 1525 | for (i = 0; i < ntevs; i++) { |
4235b045 MH |
1526 | tev = &tevs[i]; |
1527 | if (pev->event) | |
1528 | event = pev->event; | |
1529 | else | |
1530 | if (pev->point.function) | |
1531 | event = pev->point.function; | |
1532 | else | |
1533 | event = tev->point.symbol; | |
1534 | if (pev->group) | |
1535 | group = pev->group; | |
1536 | else | |
1537 | group = PERFPROBE_GROUP; | |
1538 | ||
1539 | /* Get an unused new event name */ | |
146a1439 MH |
1540 | ret = get_new_event_name(buf, 64, event, |
1541 | namelist, allow_suffix); | |
1542 | if (ret < 0) | |
1543 | break; | |
4235b045 MH |
1544 | event = buf; |
1545 | ||
02b95dad MH |
1546 | tev->event = strdup(event); |
1547 | tev->group = strdup(group); | |
1548 | if (tev->event == NULL || tev->group == NULL) { | |
1549 | ret = -ENOMEM; | |
1550 | break; | |
1551 | } | |
0e60836b | 1552 | ret = write_probe_trace_event(fd, tev); |
146a1439 MH |
1553 | if (ret < 0) |
1554 | break; | |
4235b045 MH |
1555 | /* Add added event name to namelist */ |
1556 | strlist__add(namelist, event); | |
1557 | ||
1558 | /* Trick here - save current event/group */ | |
1559 | event = pev->event; | |
1560 | group = pev->group; | |
1561 | pev->event = tev->event; | |
1562 | pev->group = tev->group; | |
1563 | show_perf_probe_event(pev); | |
1564 | /* Trick here - restore current event/group */ | |
1565 | pev->event = (char *)event; | |
1566 | pev->group = (char *)group; | |
1567 | ||
1568 | /* | |
1569 | * Probes after the first probe which comes from same | |
1570 | * user input are always allowed to add suffix, because | |
1571 | * there might be several addresses corresponding to | |
1572 | * one code line. | |
1573 | */ | |
1574 | allow_suffix = true; | |
50656eec | 1575 | } |
146a1439 MH |
1576 | |
1577 | if (ret >= 0) { | |
1578 | /* Show how to use the event. */ | |
1579 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
1580 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, | |
1581 | tev->event); | |
1582 | } | |
a9b495b0 | 1583 | |
e1d2017b | 1584 | strlist__delete(namelist); |
50656eec | 1585 | close(fd); |
146a1439 | 1586 | return ret; |
50656eec | 1587 | } |
fa28244d | 1588 | |
0e60836b SD |
1589 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
1590 | struct probe_trace_event **tevs, | |
ef4a3565 | 1591 | int max_tevs) |
e0faa8d3 MH |
1592 | { |
1593 | struct symbol *sym; | |
e334016f | 1594 | int ret = 0, i; |
0e60836b | 1595 | struct probe_trace_event *tev; |
4235b045 | 1596 | |
4b4da7f7 | 1597 | /* Convert perf_probe_event with debuginfo */ |
0e60836b | 1598 | ret = try_to_find_probe_trace_events(pev, tevs, max_tevs); |
e334016f MH |
1599 | if (ret != 0) |
1600 | return ret; | |
e0faa8d3 | 1601 | |
4235b045 | 1602 | /* Allocate trace event buffer */ |
0e60836b | 1603 | tev = *tevs = zalloc(sizeof(struct probe_trace_event)); |
e334016f MH |
1604 | if (tev == NULL) |
1605 | return -ENOMEM; | |
4235b045 MH |
1606 | |
1607 | /* Copy parameters */ | |
02b95dad MH |
1608 | tev->point.symbol = strdup(pev->point.function); |
1609 | if (tev->point.symbol == NULL) { | |
1610 | ret = -ENOMEM; | |
1611 | goto error; | |
1612 | } | |
4235b045 | 1613 | tev->point.offset = pev->point.offset; |
04ddd04b | 1614 | tev->point.retprobe = pev->point.retprobe; |
4235b045 MH |
1615 | tev->nargs = pev->nargs; |
1616 | if (tev->nargs) { | |
0e60836b | 1617 | tev->args = zalloc(sizeof(struct probe_trace_arg) |
e334016f MH |
1618 | * tev->nargs); |
1619 | if (tev->args == NULL) { | |
02b95dad MH |
1620 | ret = -ENOMEM; |
1621 | goto error; | |
e334016f | 1622 | } |
48481938 | 1623 | for (i = 0; i < tev->nargs; i++) { |
02b95dad MH |
1624 | if (pev->args[i].name) { |
1625 | tev->args[i].name = strdup(pev->args[i].name); | |
1626 | if (tev->args[i].name == NULL) { | |
1627 | ret = -ENOMEM; | |
1628 | goto error; | |
1629 | } | |
1630 | } | |
1631 | tev->args[i].value = strdup(pev->args[i].var); | |
1632 | if (tev->args[i].value == NULL) { | |
1633 | ret = -ENOMEM; | |
1634 | goto error; | |
1635 | } | |
1636 | if (pev->args[i].type) { | |
1637 | tev->args[i].type = strdup(pev->args[i].type); | |
1638 | if (tev->args[i].type == NULL) { | |
1639 | ret = -ENOMEM; | |
1640 | goto error; | |
1641 | } | |
1642 | } | |
48481938 | 1643 | } |
4235b045 MH |
1644 | } |
1645 | ||
1646 | /* Currently just checking function name from symbol map */ | |
d28c6223 | 1647 | sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION], |
4235b045 | 1648 | tev->point.symbol, NULL); |
146a1439 MH |
1649 | if (!sym) { |
1650 | pr_warning("Kernel symbol \'%s\' not found.\n", | |
1651 | tev->point.symbol); | |
02b95dad MH |
1652 | ret = -ENOENT; |
1653 | goto error; | |
1654 | } | |
e334016f | 1655 | |
02b95dad MH |
1656 | return 1; |
1657 | error: | |
0e60836b | 1658 | clear_probe_trace_event(tev); |
02b95dad MH |
1659 | free(tev); |
1660 | *tevs = NULL; | |
e334016f | 1661 | return ret; |
4235b045 MH |
1662 | } |
1663 | ||
1664 | struct __event_package { | |
1665 | struct perf_probe_event *pev; | |
0e60836b | 1666 | struct probe_trace_event *tevs; |
4235b045 MH |
1667 | int ntevs; |
1668 | }; | |
1669 | ||
146a1439 | 1670 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
c82ec0a2 | 1671 | int max_tevs, bool force_add) |
4235b045 | 1672 | { |
146a1439 | 1673 | int i, j, ret; |
4235b045 MH |
1674 | struct __event_package *pkgs; |
1675 | ||
e334016f MH |
1676 | pkgs = zalloc(sizeof(struct __event_package) * npevs); |
1677 | if (pkgs == NULL) | |
1678 | return -ENOMEM; | |
4235b045 MH |
1679 | |
1680 | /* Init vmlinux path */ | |
146a1439 | 1681 | ret = init_vmlinux(); |
449e5b24 MH |
1682 | if (ret < 0) { |
1683 | free(pkgs); | |
146a1439 | 1684 | return ret; |
449e5b24 | 1685 | } |
4235b045 MH |
1686 | |
1687 | /* Loop 1: convert all events */ | |
1688 | for (i = 0; i < npevs; i++) { | |
1689 | pkgs[i].pev = &pevs[i]; | |
1690 | /* Convert with or without debuginfo */ | |
0e60836b | 1691 | ret = convert_to_probe_trace_events(pkgs[i].pev, |
ef4a3565 | 1692 | &pkgs[i].tevs, max_tevs); |
146a1439 MH |
1693 | if (ret < 0) |
1694 | goto end; | |
1695 | pkgs[i].ntevs = ret; | |
e0faa8d3 MH |
1696 | } |
1697 | ||
4235b045 | 1698 | /* Loop 2: add all events */ |
146a1439 | 1699 | for (i = 0; i < npevs && ret >= 0; i++) |
0e60836b | 1700 | ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs, |
146a1439 MH |
1701 | pkgs[i].ntevs, force_add); |
1702 | end: | |
449e5b24 MH |
1703 | /* Loop 3: cleanup and free trace events */ |
1704 | for (i = 0; i < npevs; i++) { | |
146a1439 | 1705 | for (j = 0; j < pkgs[i].ntevs; j++) |
0e60836b | 1706 | clear_probe_trace_event(&pkgs[i].tevs[j]); |
449e5b24 MH |
1707 | free(pkgs[i].tevs); |
1708 | } | |
1709 | free(pkgs); | |
146a1439 MH |
1710 | |
1711 | return ret; | |
e0faa8d3 MH |
1712 | } |
1713 | ||
0e60836b | 1714 | static int __del_trace_probe_event(int fd, struct str_node *ent) |
bbbb521b MH |
1715 | { |
1716 | char *p; | |
1717 | char buf[128]; | |
4235b045 | 1718 | int ret; |
bbbb521b | 1719 | |
0e60836b | 1720 | /* Convert from perf-probe event to trace-probe event */ |
146a1439 MH |
1721 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1722 | if (ret < 0) | |
1723 | goto error; | |
1724 | ||
bbbb521b | 1725 | p = strchr(buf + 2, ':'); |
146a1439 MH |
1726 | if (!p) { |
1727 | pr_debug("Internal error: %s should have ':' but not.\n", | |
1728 | ent->s); | |
1729 | ret = -ENOTSUP; | |
1730 | goto error; | |
1731 | } | |
bbbb521b MH |
1732 | *p = '/'; |
1733 | ||
4235b045 MH |
1734 | pr_debug("Writing event: %s\n", buf); |
1735 | ret = write(fd, buf, strlen(buf)); | |
146a1439 MH |
1736 | if (ret < 0) |
1737 | goto error; | |
1738 | ||
bbbb521b | 1739 | printf("Remove event: %s\n", ent->s); |
146a1439 MH |
1740 | return 0; |
1741 | error: | |
1742 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); | |
1743 | return ret; | |
bbbb521b MH |
1744 | } |
1745 | ||
0e60836b | 1746 | static int del_trace_probe_event(int fd, const char *group, |
146a1439 | 1747 | const char *event, struct strlist *namelist) |
fa28244d MH |
1748 | { |
1749 | char buf[128]; | |
bbbb521b | 1750 | struct str_node *ent, *n; |
146a1439 | 1751 | int found = 0, ret = 0; |
fa28244d | 1752 | |
146a1439 MH |
1753 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1754 | if (ret < 0) { | |
1755 | pr_err("Failed to copy event."); | |
1756 | return ret; | |
1757 | } | |
fa28244d | 1758 | |
bbbb521b MH |
1759 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1760 | strlist__for_each_safe(ent, n, namelist) | |
1761 | if (strglobmatch(ent->s, buf)) { | |
1762 | found++; | |
0e60836b | 1763 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1764 | if (ret < 0) |
1765 | break; | |
bbbb521b MH |
1766 | strlist__remove(namelist, ent); |
1767 | } | |
1768 | } else { | |
1769 | ent = strlist__find(namelist, buf); | |
1770 | if (ent) { | |
1771 | found++; | |
0e60836b | 1772 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1773 | if (ret >= 0) |
1774 | strlist__remove(namelist, ent); | |
bbbb521b MH |
1775 | } |
1776 | } | |
146a1439 MH |
1777 | if (found == 0 && ret >= 0) |
1778 | pr_info("Info: Event \"%s\" does not exist.\n", buf); | |
1779 | ||
1780 | return ret; | |
fa28244d MH |
1781 | } |
1782 | ||
146a1439 | 1783 | int del_perf_probe_events(struct strlist *dellist) |
fa28244d | 1784 | { |
146a1439 | 1785 | int fd, ret = 0; |
fa28244d MH |
1786 | const char *group, *event; |
1787 | char *p, *str; | |
1788 | struct str_node *ent; | |
1789 | struct strlist *namelist; | |
1790 | ||
f4d7da49 | 1791 | fd = open_kprobe_events(true); |
146a1439 MH |
1792 | if (fd < 0) |
1793 | return fd; | |
1794 | ||
fa28244d | 1795 | /* Get current event names */ |
0e60836b | 1796 | namelist = get_probe_trace_event_names(fd, true); |
146a1439 MH |
1797 | if (namelist == NULL) |
1798 | return -EINVAL; | |
fa28244d | 1799 | |
adf365f4 | 1800 | strlist__for_each(ent, dellist) { |
02b95dad MH |
1801 | str = strdup(ent->s); |
1802 | if (str == NULL) { | |
1803 | ret = -ENOMEM; | |
1804 | break; | |
1805 | } | |
bbbb521b | 1806 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1807 | p = strchr(str, ':'); |
1808 | if (p) { | |
1809 | group = str; | |
1810 | *p = '\0'; | |
1811 | event = p + 1; | |
1812 | } else { | |
bbbb521b | 1813 | group = "*"; |
fa28244d MH |
1814 | event = str; |
1815 | } | |
bbbb521b | 1816 | pr_debug("Group: %s, Event: %s\n", group, event); |
0e60836b | 1817 | ret = del_trace_probe_event(fd, group, event, namelist); |
fa28244d | 1818 | free(str); |
146a1439 MH |
1819 | if (ret < 0) |
1820 | break; | |
fa28244d MH |
1821 | } |
1822 | strlist__delete(namelist); | |
1823 | close(fd); | |
146a1439 MH |
1824 | |
1825 | return ret; | |
fa28244d MH |
1826 | } |
1827 |