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 | |
469b9b88 | 77 | /* Initialize symbol maps and path of vmlinux/modules */ |
146a1439 | 78 | static int init_vmlinux(void) |
e0faa8d3 | 79 | { |
146a1439 MH |
80 | int ret; |
81 | ||
e0faa8d3 MH |
82 | symbol_conf.sort_by_name = true; |
83 | if (symbol_conf.vmlinux_name == NULL) | |
84 | symbol_conf.try_vmlinux_path = true; | |
85 | else | |
86 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
146a1439 MH |
87 | ret = symbol__init(); |
88 | if (ret < 0) { | |
89 | pr_debug("Failed to init symbol map.\n"); | |
90 | goto out; | |
91 | } | |
e0faa8d3 | 92 | |
469b9b88 | 93 | ret = machine__init(&machine, "", HOST_KERNEL_ID); |
d28c6223 ACM |
94 | if (ret < 0) |
95 | goto out; | |
96 | ||
469b9b88 | 97 | if (machine__create_kernel_maps(&machine) < 0) { |
0e43e5d2 | 98 | pr_debug("machine__create_kernel_maps() failed.\n"); |
469b9b88 MH |
99 | goto out; |
100 | } | |
146a1439 MH |
101 | out: |
102 | if (ret < 0) | |
103 | pr_warning("Failed to init vmlinux path.\n"); | |
104 | return ret; | |
e0faa8d3 MH |
105 | } |
106 | ||
469b9b88 MH |
107 | static struct symbol *__find_kernel_function_by_name(const char *name, |
108 | struct map **mapp) | |
109 | { | |
110 | return machine__find_kernel_function_by_name(&machine, name, mapp, | |
111 | NULL); | |
112 | } | |
113 | ||
114 | const char *kernel_get_module_path(const char *module) | |
115 | { | |
116 | struct dso *dso; | |
117 | ||
118 | if (module) { | |
119 | list_for_each_entry(dso, &machine.kernel_dsos, node) { | |
120 | if (strncmp(dso->short_name + 1, module, | |
121 | dso->short_name_len - 2) == 0) | |
122 | goto found; | |
123 | } | |
124 | pr_debug("Failed to find module %s.\n", module); | |
125 | return NULL; | |
126 | } else { | |
127 | dso = machine.vmlinux_maps[MAP__FUNCTION]->dso; | |
128 | if (dso__load_vmlinux_path(dso, | |
129 | machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) { | |
130 | pr_debug("Failed to load kernel map.\n"); | |
131 | return NULL; | |
132 | } | |
133 | } | |
134 | found: | |
135 | return dso->long_name; | |
136 | } | |
137 | ||
4b4da7f7 | 138 | #ifdef DWARF_SUPPORT |
469b9b88 | 139 | static int open_vmlinux(const char *module) |
e0faa8d3 | 140 | { |
469b9b88 MH |
141 | const char *path = kernel_get_module_path(module); |
142 | if (!path) { | |
0e43e5d2 MH |
143 | pr_err("Failed to find path of %s module.\n", |
144 | module ?: "kernel"); | |
469b9b88 | 145 | return -ENOENT; |
e0faa8d3 | 146 | } |
469b9b88 MH |
147 | pr_debug("Try to open %s\n", path); |
148 | return open(path, O_RDONLY); | |
e0faa8d3 | 149 | } |
4b4da7f7 | 150 | |
0e60836b SD |
151 | /* |
152 | * Convert trace point to probe point with debuginfo | |
153 | * Currently only handles kprobes. | |
154 | */ | |
155 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, | |
469b9b88 | 156 | struct perf_probe_point *pp) |
4b4da7f7 MH |
157 | { |
158 | struct symbol *sym; | |
469b9b88 MH |
159 | struct map *map; |
160 | u64 addr; | |
161 | int ret = -ENOENT; | |
4b4da7f7 | 162 | |
469b9b88 | 163 | sym = __find_kernel_function_by_name(tp->symbol, &map); |
4b4da7f7 | 164 | if (sym) { |
469b9b88 MH |
165 | addr = map->unmap_ip(map, sym->start + tp->offset); |
166 | pr_debug("try to find %s+%ld@%llx\n", tp->symbol, | |
167 | tp->offset, addr); | |
168 | ret = find_perf_probe_point((unsigned long)addr, pp); | |
4b4da7f7 MH |
169 | } |
170 | if (ret <= 0) { | |
146a1439 MH |
171 | pr_debug("Failed to find corresponding probes from " |
172 | "debuginfo. Use kprobe event information.\n"); | |
02b95dad MH |
173 | pp->function = strdup(tp->symbol); |
174 | if (pp->function == NULL) | |
175 | return -ENOMEM; | |
4b4da7f7 MH |
176 | pp->offset = tp->offset; |
177 | } | |
178 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
179 | |
180 | return 0; | |
4b4da7f7 MH |
181 | } |
182 | ||
183 | /* Try to find perf_probe_event with debuginfo */ | |
0e60836b SD |
184 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
185 | struct probe_trace_event **tevs, | |
469b9b88 | 186 | int max_tevs, const char *module) |
4b4da7f7 MH |
187 | { |
188 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
189 | int fd, ntevs; | |
190 | ||
469b9b88 | 191 | fd = open_vmlinux(module); |
4b4da7f7 | 192 | if (fd < 0) { |
146a1439 MH |
193 | if (need_dwarf) { |
194 | pr_warning("Failed to open debuginfo file.\n"); | |
195 | return fd; | |
196 | } | |
4b4da7f7 MH |
197 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* Searching trace events corresponding to probe event */ | |
0e60836b | 202 | ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs); |
4b4da7f7 MH |
203 | close(fd); |
204 | ||
146a1439 | 205 | if (ntevs > 0) { /* Succeeded to find trace events */ |
0e60836b | 206 | pr_debug("find %d probe_trace_events.\n", ntevs); |
4b4da7f7 | 207 | return ntevs; |
146a1439 | 208 | } |
4b4da7f7 | 209 | |
146a1439 MH |
210 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
211 | pr_warning("Probe point '%s' not found.\n", | |
212 | synthesize_perf_probe_point(&pev->point)); | |
213 | return -ENOENT; | |
214 | } | |
215 | /* Error path : ntevs < 0 */ | |
15eca306 MH |
216 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
217 | if (ntevs == -EBADF) { | |
218 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
219 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
220 | if (!need_dwarf) { | |
0e43e5d2 | 221 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
222 | return 0; |
223 | } | |
4b4da7f7 | 224 | } |
15eca306 | 225 | return ntevs; |
4b4da7f7 MH |
226 | } |
227 | ||
7cf0b79e MH |
228 | /* |
229 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
230 | * and chop off leading directories that do not exist. Result is passed back as | |
231 | * a newly allocated path on success. | |
232 | * Return 0 if file was found and readable, -errno otherwise. | |
233 | */ | |
6a330a3c MH |
234 | static int get_real_path(const char *raw_path, const char *comp_dir, |
235 | char **new_path) | |
7cf0b79e | 236 | { |
6a330a3c MH |
237 | const char *prefix = symbol_conf.source_prefix; |
238 | ||
239 | if (!prefix) { | |
240 | if (raw_path[0] != '/' && comp_dir) | |
241 | /* If not an absolute path, try to use comp_dir */ | |
242 | prefix = comp_dir; | |
243 | else { | |
244 | if (access(raw_path, R_OK) == 0) { | |
245 | *new_path = strdup(raw_path); | |
246 | return 0; | |
247 | } else | |
248 | return -errno; | |
249 | } | |
7cf0b79e MH |
250 | } |
251 | ||
6a330a3c | 252 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); |
7cf0b79e MH |
253 | if (!*new_path) |
254 | return -ENOMEM; | |
255 | ||
256 | for (;;) { | |
6a330a3c | 257 | sprintf(*new_path, "%s/%s", prefix, raw_path); |
7cf0b79e MH |
258 | |
259 | if (access(*new_path, R_OK) == 0) | |
260 | return 0; | |
261 | ||
6a330a3c MH |
262 | if (!symbol_conf.source_prefix) |
263 | /* In case of searching comp_dir, don't retry */ | |
264 | return -errno; | |
265 | ||
7cf0b79e MH |
266 | switch (errno) { |
267 | case ENAMETOOLONG: | |
268 | case ENOENT: | |
269 | case EROFS: | |
270 | case EFAULT: | |
271 | raw_path = strchr(++raw_path, '/'); | |
272 | if (!raw_path) { | |
273 | free(*new_path); | |
274 | *new_path = NULL; | |
275 | return -ENOENT; | |
276 | } | |
277 | continue; | |
278 | ||
279 | default: | |
280 | free(*new_path); | |
281 | *new_path = NULL; | |
282 | return -errno; | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
4b4da7f7 MH |
287 | #define LINEBUF_SIZE 256 |
288 | #define NR_ADDITIONAL_LINES 2 | |
289 | ||
d3b63d7a | 290 | static int show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 MH |
291 | { |
292 | char buf[LINEBUF_SIZE]; | |
293 | const char *color = PERF_COLOR_BLUE; | |
294 | ||
295 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
296 | goto error; | |
297 | if (!skip) { | |
298 | if (show_num) | |
d3b63d7a | 299 | fprintf(stdout, "%7d %s", l, buf); |
4b4da7f7 MH |
300 | else |
301 | color_fprintf(stdout, color, " %s", buf); | |
302 | } | |
303 | ||
304 | while (strlen(buf) == LINEBUF_SIZE - 1 && | |
305 | buf[LINEBUF_SIZE - 2] != '\n') { | |
306 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
307 | goto error; | |
308 | if (!skip) { | |
309 | if (show_num) | |
310 | fprintf(stdout, "%s", buf); | |
311 | else | |
312 | color_fprintf(stdout, color, "%s", buf); | |
313 | } | |
314 | } | |
146a1439 MH |
315 | |
316 | return 0; | |
4b4da7f7 MH |
317 | error: |
318 | if (feof(fp)) | |
146a1439 | 319 | pr_warning("Source file is shorter than expected.\n"); |
4b4da7f7 | 320 | else |
146a1439 MH |
321 | pr_warning("File read error: %s\n", strerror(errno)); |
322 | ||
323 | return -1; | |
4b4da7f7 MH |
324 | } |
325 | ||
326 | /* | |
327 | * Show line-range always requires debuginfo to find source file and | |
328 | * line number. | |
329 | */ | |
469b9b88 | 330 | int show_line_range(struct line_range *lr, const char *module) |
4b4da7f7 | 331 | { |
d3b63d7a | 332 | int l = 1; |
4b4da7f7 MH |
333 | struct line_node *ln; |
334 | FILE *fp; | |
335 | int fd, ret; | |
7cf0b79e | 336 | char *tmp; |
4b4da7f7 MH |
337 | |
338 | /* Search a line range */ | |
146a1439 MH |
339 | ret = init_vmlinux(); |
340 | if (ret < 0) | |
341 | return ret; | |
342 | ||
469b9b88 | 343 | fd = open_vmlinux(module); |
146a1439 MH |
344 | if (fd < 0) { |
345 | pr_warning("Failed to open debuginfo file.\n"); | |
346 | return fd; | |
347 | } | |
348 | ||
4b4da7f7 | 349 | ret = find_line_range(fd, lr); |
4b4da7f7 | 350 | close(fd); |
146a1439 MH |
351 | if (ret == 0) { |
352 | pr_warning("Specified source line is not found.\n"); | |
353 | return -ENOENT; | |
354 | } else if (ret < 0) { | |
355 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); | |
356 | return ret; | |
357 | } | |
4b4da7f7 | 358 | |
7cf0b79e MH |
359 | /* Convert source file path */ |
360 | tmp = lr->path; | |
6a330a3c | 361 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
7cf0b79e MH |
362 | free(tmp); /* Free old path */ |
363 | if (ret < 0) { | |
364 | pr_warning("Failed to find source file. (%d)\n", ret); | |
365 | return ret; | |
366 | } | |
367 | ||
4b4da7f7 MH |
368 | setup_pager(); |
369 | ||
370 | if (lr->function) | |
371 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
372 | lr->start - lr->offset); | |
373 | else | |
62c15fc4 | 374 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
375 | |
376 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
377 | if (fp == NULL) { |
378 | pr_warning("Failed to open %s: %s\n", lr->path, | |
379 | strerror(errno)); | |
380 | return -errno; | |
381 | } | |
4b4da7f7 | 382 | /* Skip to starting line number */ |
146a1439 MH |
383 | while (l < lr->start && ret >= 0) |
384 | ret = show_one_line(fp, l++, true, false); | |
385 | if (ret < 0) | |
386 | goto end; | |
4b4da7f7 MH |
387 | |
388 | list_for_each_entry(ln, &lr->line_list, list) { | |
146a1439 MH |
389 | while (ln->line > l && ret >= 0) |
390 | ret = show_one_line(fp, (l++) - lr->offset, | |
391 | false, false); | |
392 | if (ret >= 0) | |
393 | ret = show_one_line(fp, (l++) - lr->offset, | |
394 | false, true); | |
395 | if (ret < 0) | |
396 | goto end; | |
4b4da7f7 MH |
397 | } |
398 | ||
399 | if (lr->end == INT_MAX) | |
400 | lr->end = l + NR_ADDITIONAL_LINES; | |
dda4ab34 | 401 | while (l <= lr->end && !feof(fp) && ret >= 0) |
146a1439 MH |
402 | ret = show_one_line(fp, (l++) - lr->offset, false, false); |
403 | end: | |
4b4da7f7 | 404 | fclose(fp); |
146a1439 | 405 | return ret; |
4b4da7f7 MH |
406 | } |
407 | ||
cf6eb489 | 408 | static int show_available_vars_at(int fd, struct perf_probe_event *pev, |
fb8c5a56 | 409 | int max_vls, bool externs) |
cf6eb489 MH |
410 | { |
411 | char *buf; | |
412 | int ret, i; | |
413 | struct str_node *node; | |
414 | struct variable_list *vls = NULL, *vl; | |
415 | ||
416 | buf = synthesize_perf_probe_point(&pev->point); | |
417 | if (!buf) | |
418 | return -EINVAL; | |
419 | pr_debug("Searching variables at %s\n", buf); | |
420 | ||
fb8c5a56 | 421 | ret = find_available_vars_at(fd, pev, &vls, max_vls, externs); |
cf6eb489 MH |
422 | if (ret > 0) { |
423 | /* Some variables were found */ | |
424 | fprintf(stdout, "Available variables at %s\n", buf); | |
425 | for (i = 0; i < ret; i++) { | |
426 | vl = &vls[i]; | |
427 | /* | |
428 | * A probe point might be converted to | |
429 | * several trace points. | |
430 | */ | |
431 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
432 | vl->point.offset); | |
433 | free(vl->point.symbol); | |
434 | if (vl->vars) { | |
435 | strlist__for_each(node, vl->vars) | |
436 | fprintf(stdout, "\t\t%s\n", node->s); | |
437 | strlist__delete(vl->vars); | |
438 | } else | |
439 | fprintf(stdout, "(No variables)\n"); | |
440 | } | |
441 | free(vls); | |
442 | } else | |
443 | pr_err("Failed to find variables at %s (%d)\n", buf, ret); | |
444 | ||
445 | free(buf); | |
446 | return ret; | |
447 | } | |
448 | ||
449 | /* Show available variables on given probe point */ | |
450 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
469b9b88 | 451 | int max_vls, const char *module, bool externs) |
cf6eb489 MH |
452 | { |
453 | int i, fd, ret = 0; | |
454 | ||
455 | ret = init_vmlinux(); | |
456 | if (ret < 0) | |
457 | return ret; | |
458 | ||
469b9b88 | 459 | fd = open_vmlinux(module); |
cf6eb489 | 460 | if (fd < 0) { |
0e43e5d2 | 461 | pr_warning("Failed to open debug information file.\n"); |
cf6eb489 MH |
462 | return fd; |
463 | } | |
464 | ||
465 | setup_pager(); | |
466 | ||
467 | for (i = 0; i < npevs && ret >= 0; i++) | |
fb8c5a56 | 468 | ret = show_available_vars_at(fd, &pevs[i], max_vls, externs); |
cf6eb489 MH |
469 | |
470 | close(fd); | |
471 | return ret; | |
472 | } | |
473 | ||
4b4da7f7 MH |
474 | #else /* !DWARF_SUPPORT */ |
475 | ||
0e60836b | 476 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, |
469b9b88 | 477 | struct perf_probe_point *pp) |
4b4da7f7 | 478 | { |
469b9b88 MH |
479 | struct symbol *sym; |
480 | ||
481 | sym = __find_kernel_function_by_name(tp->symbol, NULL); | |
482 | if (!sym) { | |
483 | pr_err("Failed to find symbol %s in kernel.\n", tp->symbol); | |
484 | return -ENOENT; | |
485 | } | |
02b95dad MH |
486 | pp->function = strdup(tp->symbol); |
487 | if (pp->function == NULL) | |
488 | return -ENOMEM; | |
4b4da7f7 MH |
489 | pp->offset = tp->offset; |
490 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
491 | |
492 | return 0; | |
4b4da7f7 MH |
493 | } |
494 | ||
0e60836b SD |
495 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
496 | struct probe_trace_event **tevs __unused, | |
469b9b88 | 497 | int max_tevs __unused, const char *mod __unused) |
4b4da7f7 | 498 | { |
146a1439 MH |
499 | if (perf_probe_event_need_dwarf(pev)) { |
500 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
501 | return -ENOSYS; | |
502 | } | |
4b4da7f7 MH |
503 | return 0; |
504 | } | |
505 | ||
469b9b88 | 506 | int show_line_range(struct line_range *lr __unused, const char *module __unused) |
4b4da7f7 | 507 | { |
146a1439 MH |
508 | pr_warning("Debuginfo-analysis is not supported.\n"); |
509 | return -ENOSYS; | |
4b4da7f7 MH |
510 | } |
511 | ||
cf6eb489 | 512 | int show_available_vars(struct perf_probe_event *pevs __unused, |
469b9b88 MH |
513 | int npevs __unused, int max_vls __unused, |
514 | const char *module __unused, bool externs __unused) | |
cf6eb489 MH |
515 | { |
516 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
517 | return -ENOSYS; | |
518 | } | |
e0faa8d3 MH |
519 | #endif |
520 | ||
146a1439 | 521 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def MH |
522 | { |
523 | const char *ptr; | |
524 | char *tmp; | |
525 | /* | |
526 | * <Syntax> | |
527 | * SRC:SLN[+NUM|-ELN] | |
528 | * FUNC[:SLN[+NUM|-ELN]] | |
529 | */ | |
530 | ptr = strchr(arg, ':'); | |
531 | if (ptr) { | |
d3b63d7a | 532 | lr->start = (int)strtoul(ptr + 1, &tmp, 0); |
dda4ab34 | 533 | if (*tmp == '+') { |
d3b63d7a | 534 | lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0); |
dda4ab34 MH |
535 | lr->end--; /* |
536 | * Adjust the number of lines here. | |
537 | * If the number of lines == 1, the | |
538 | * the end of line should be equal to | |
539 | * the start of line. | |
540 | */ | |
541 | } else if (*tmp == '-') | |
d3b63d7a | 542 | lr->end = (int)strtoul(tmp + 1, &tmp, 0); |
631c9def | 543 | else |
d3b63d7a MH |
544 | lr->end = INT_MAX; |
545 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); | |
546 | if (lr->start > lr->end) { | |
631c9def | 547 | semantic_error("Start line must be smaller" |
146a1439 MH |
548 | " than end line.\n"); |
549 | return -EINVAL; | |
550 | } | |
551 | if (*tmp != '\0') { | |
552 | semantic_error("Tailing with invalid character '%d'.\n", | |
631c9def | 553 | *tmp); |
146a1439 MH |
554 | return -EINVAL; |
555 | } | |
02b95dad | 556 | tmp = strndup(arg, (ptr - arg)); |
d3b63d7a | 557 | } else { |
02b95dad | 558 | tmp = strdup(arg); |
d3b63d7a MH |
559 | lr->end = INT_MAX; |
560 | } | |
02b95dad MH |
561 | |
562 | if (tmp == NULL) | |
563 | return -ENOMEM; | |
631c9def MH |
564 | |
565 | if (strchr(tmp, '.')) | |
566 | lr->file = tmp; | |
567 | else | |
568 | lr->function = tmp; | |
146a1439 MH |
569 | |
570 | return 0; | |
631c9def MH |
571 | } |
572 | ||
b7702a21 MH |
573 | /* Check the name is good for event/group */ |
574 | static bool check_event_name(const char *name) | |
575 | { | |
576 | if (!isalpha(*name) && *name != '_') | |
577 | return false; | |
578 | while (*++name != '\0') { | |
579 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
580 | return false; | |
581 | } | |
582 | return true; | |
583 | } | |
584 | ||
50656eec | 585 | /* Parse probepoint definition. */ |
146a1439 | 586 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 587 | { |
4235b045 | 588 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
589 | char *ptr, *tmp; |
590 | char c, nc = 0; | |
591 | /* | |
592 | * <Syntax> | |
2a9c8c36 MH |
593 | * perf probe [EVENT=]SRC[:LN|;PTN] |
594 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
595 | * |
596 | * TODO:Group name support | |
50656eec MH |
597 | */ |
598 | ||
2a9c8c36 MH |
599 | ptr = strpbrk(arg, ";=@+%"); |
600 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
601 | *ptr = '\0'; |
602 | tmp = ptr + 1; | |
146a1439 MH |
603 | if (strchr(arg, ':')) { |
604 | semantic_error("Group name is not supported yet.\n"); | |
605 | return -ENOTSUP; | |
606 | } | |
607 | if (!check_event_name(arg)) { | |
b7702a21 | 608 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
609 | "follow C symbol-naming rule.\n", arg); |
610 | return -EINVAL; | |
611 | } | |
02b95dad MH |
612 | pev->event = strdup(arg); |
613 | if (pev->event == NULL) | |
614 | return -ENOMEM; | |
4235b045 | 615 | pev->group = NULL; |
af663d75 MH |
616 | arg = tmp; |
617 | } | |
618 | ||
2a9c8c36 | 619 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
620 | if (ptr) { |
621 | nc = *ptr; | |
622 | *ptr++ = '\0'; | |
623 | } | |
624 | ||
02b95dad MH |
625 | tmp = strdup(arg); |
626 | if (tmp == NULL) | |
627 | return -ENOMEM; | |
628 | ||
50656eec | 629 | /* Check arg is function or file and copy it */ |
02b95dad MH |
630 | if (strchr(tmp, '.')) /* File */ |
631 | pp->file = tmp; | |
50656eec | 632 | else /* Function */ |
02b95dad | 633 | pp->function = tmp; |
50656eec MH |
634 | |
635 | /* Parse other options */ | |
636 | while (ptr) { | |
637 | arg = ptr; | |
638 | c = nc; | |
2a9c8c36 | 639 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
640 | pp->lazy_line = strdup(arg); |
641 | if (pp->lazy_line == NULL) | |
642 | return -ENOMEM; | |
2a9c8c36 MH |
643 | break; |
644 | } | |
645 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
646 | if (ptr) { |
647 | nc = *ptr; | |
648 | *ptr++ = '\0'; | |
649 | } | |
650 | switch (c) { | |
651 | case ':': /* Line number */ | |
652 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 653 | if (*tmp != '\0') { |
2a9c8c36 | 654 | semantic_error("There is non-digit char" |
146a1439 MH |
655 | " in line number.\n"); |
656 | return -EINVAL; | |
657 | } | |
50656eec MH |
658 | break; |
659 | case '+': /* Byte offset from a symbol */ | |
660 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 661 | if (*tmp != '\0') { |
2a9c8c36 | 662 | semantic_error("There is non-digit character" |
146a1439 MH |
663 | " in offset.\n"); |
664 | return -EINVAL; | |
665 | } | |
50656eec MH |
666 | break; |
667 | case '@': /* File name */ | |
146a1439 MH |
668 | if (pp->file) { |
669 | semantic_error("SRC@SRC is not allowed.\n"); | |
670 | return -EINVAL; | |
671 | } | |
02b95dad MH |
672 | pp->file = strdup(arg); |
673 | if (pp->file == NULL) | |
674 | return -ENOMEM; | |
50656eec MH |
675 | break; |
676 | case '%': /* Probe places */ | |
677 | if (strcmp(arg, "return") == 0) { | |
678 | pp->retprobe = 1; | |
146a1439 MH |
679 | } else { /* Others not supported yet */ |
680 | semantic_error("%%%s is not supported.\n", arg); | |
681 | return -ENOTSUP; | |
682 | } | |
50656eec | 683 | break; |
146a1439 MH |
684 | default: /* Buggy case */ |
685 | pr_err("This program has a bug at %s:%d.\n", | |
686 | __FILE__, __LINE__); | |
687 | return -ENOTSUP; | |
50656eec MH |
688 | break; |
689 | } | |
690 | } | |
691 | ||
692 | /* Exclusion check */ | |
146a1439 | 693 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
694 | semantic_error("Lazy pattern can't be used with" |
695 | " line number.\n"); | |
146a1439 MH |
696 | return -EINVAL; |
697 | } | |
2a9c8c36 | 698 | |
146a1439 | 699 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 700 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
701 | return -EINVAL; |
702 | } | |
2a9c8c36 | 703 | |
146a1439 | 704 | if (pp->line && pp->offset) { |
0e43e5d2 | 705 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
706 | return -EINVAL; |
707 | } | |
50656eec | 708 | |
146a1439 | 709 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 710 | semantic_error("File always requires line number or " |
0e43e5d2 | 711 | "lazy pattern.\n"); |
146a1439 MH |
712 | return -EINVAL; |
713 | } | |
50656eec | 714 | |
146a1439 | 715 | if (pp->offset && !pp->function) { |
0e43e5d2 | 716 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
717 | return -EINVAL; |
718 | } | |
50656eec | 719 | |
146a1439 | 720 | if (pp->retprobe && !pp->function) { |
0e43e5d2 | 721 | semantic_error("Return probe requires an entry function.\n"); |
146a1439 MH |
722 | return -EINVAL; |
723 | } | |
50656eec | 724 | |
146a1439 | 725 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 726 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 727 | "return probe.\n"); |
146a1439 MH |
728 | return -EINVAL; |
729 | } | |
50656eec | 730 | |
4235b045 | 731 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
732 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
733 | pp->lazy_line); | |
146a1439 | 734 | return 0; |
50656eec MH |
735 | } |
736 | ||
7df2f329 | 737 | /* Parse perf-probe event argument */ |
146a1439 | 738 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 739 | { |
b2a3c12b | 740 | char *tmp, *goodname; |
7df2f329 MH |
741 | struct perf_probe_arg_field **fieldp; |
742 | ||
743 | pr_debug("parsing arg: %s into ", str); | |
744 | ||
48481938 MH |
745 | tmp = strchr(str, '='); |
746 | if (tmp) { | |
02b95dad MH |
747 | arg->name = strndup(str, tmp - str); |
748 | if (arg->name == NULL) | |
749 | return -ENOMEM; | |
11a1ca35 | 750 | pr_debug("name:%s ", arg->name); |
48481938 MH |
751 | str = tmp + 1; |
752 | } | |
753 | ||
11a1ca35 MH |
754 | tmp = strchr(str, ':'); |
755 | if (tmp) { /* Type setting */ | |
756 | *tmp = '\0'; | |
02b95dad MH |
757 | arg->type = strdup(tmp + 1); |
758 | if (arg->type == NULL) | |
759 | return -ENOMEM; | |
11a1ca35 MH |
760 | pr_debug("type:%s ", arg->type); |
761 | } | |
762 | ||
b2a3c12b | 763 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
764 | if (!is_c_varname(str) || !tmp) { |
765 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
766 | arg->var = strdup(str); |
767 | if (arg->var == NULL) | |
768 | return -ENOMEM; | |
48481938 | 769 | pr_debug("%s\n", arg->var); |
146a1439 | 770 | return 0; |
7df2f329 MH |
771 | } |
772 | ||
b2a3c12b | 773 | /* Structure fields or array element */ |
02b95dad MH |
774 | arg->var = strndup(str, tmp - str); |
775 | if (arg->var == NULL) | |
776 | return -ENOMEM; | |
b2a3c12b | 777 | goodname = arg->var; |
48481938 | 778 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
779 | fieldp = &arg->field; |
780 | ||
781 | do { | |
e334016f MH |
782 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
783 | if (*fieldp == NULL) | |
784 | return -ENOMEM; | |
b2a3c12b MH |
785 | if (*tmp == '[') { /* Array */ |
786 | str = tmp; | |
787 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 788 | (*fieldp)->ref = true; |
b2a3c12b MH |
789 | if (*tmp != ']' || tmp == str + 1) { |
790 | semantic_error("Array index must be a" | |
791 | " number.\n"); | |
792 | return -EINVAL; | |
793 | } | |
794 | tmp++; | |
795 | if (*tmp == '\0') | |
796 | tmp = NULL; | |
797 | } else { /* Structure */ | |
798 | if (*tmp == '.') { | |
799 | str = tmp + 1; | |
800 | (*fieldp)->ref = false; | |
801 | } else if (tmp[1] == '>') { | |
802 | str = tmp + 2; | |
803 | (*fieldp)->ref = true; | |
804 | } else { | |
805 | semantic_error("Argument parse error: %s\n", | |
806 | str); | |
807 | return -EINVAL; | |
808 | } | |
809 | tmp = strpbrk(str, "-.["); | |
146a1439 | 810 | } |
7df2f329 | 811 | if (tmp) { |
02b95dad MH |
812 | (*fieldp)->name = strndup(str, tmp - str); |
813 | if ((*fieldp)->name == NULL) | |
814 | return -ENOMEM; | |
b2a3c12b MH |
815 | if (*str != '[') |
816 | goodname = (*fieldp)->name; | |
7df2f329 MH |
817 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
818 | fieldp = &(*fieldp)->next; | |
819 | } | |
820 | } while (tmp); | |
02b95dad MH |
821 | (*fieldp)->name = strdup(str); |
822 | if ((*fieldp)->name == NULL) | |
823 | return -ENOMEM; | |
b2a3c12b MH |
824 | if (*str != '[') |
825 | goodname = (*fieldp)->name; | |
7df2f329 | 826 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 827 | |
b2a3c12b | 828 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 829 | if (!arg->name) { |
b2a3c12b | 830 | arg->name = strdup(goodname); |
02b95dad MH |
831 | if (arg->name == NULL) |
832 | return -ENOMEM; | |
833 | } | |
146a1439 | 834 | return 0; |
7df2f329 MH |
835 | } |
836 | ||
4235b045 | 837 | /* Parse perf-probe event command */ |
146a1439 | 838 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 839 | { |
e1c01d61 | 840 | char **argv; |
146a1439 | 841 | int argc, i, ret = 0; |
fac13fd5 | 842 | |
4235b045 | 843 | argv = argv_split(cmd, &argc); |
146a1439 MH |
844 | if (!argv) { |
845 | pr_debug("Failed to split arguments.\n"); | |
846 | return -ENOMEM; | |
847 | } | |
848 | if (argc - 1 > MAX_PROBE_ARGS) { | |
849 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
850 | ret = -ERANGE; | |
851 | goto out; | |
852 | } | |
50656eec | 853 | /* Parse probe point */ |
146a1439 MH |
854 | ret = parse_perf_probe_point(argv[0], pev); |
855 | if (ret < 0) | |
856 | goto out; | |
50656eec | 857 | |
e1c01d61 | 858 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 859 | pev->nargs = argc - 1; |
e334016f MH |
860 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
861 | if (pev->args == NULL) { | |
862 | ret = -ENOMEM; | |
863 | goto out; | |
864 | } | |
146a1439 MH |
865 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
866 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
867 | if (ret >= 0 && | |
868 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 869 | semantic_error("You can't specify local variable for" |
146a1439 MH |
870 | " kretprobe.\n"); |
871 | ret = -EINVAL; | |
872 | } | |
e1c01d61 | 873 | } |
146a1439 | 874 | out: |
e1c01d61 | 875 | argv_free(argv); |
146a1439 MH |
876 | |
877 | return ret; | |
50656eec MH |
878 | } |
879 | ||
4235b045 MH |
880 | /* Return true if this perf_probe_event requires debuginfo */ |
881 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
882 | { | |
883 | int i; | |
884 | ||
885 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
886 | return true; | |
887 | ||
888 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 889 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
890 | return true; |
891 | ||
892 | return false; | |
893 | } | |
894 | ||
0e60836b SD |
895 | /* Parse probe_events event into struct probe_point */ |
896 | static int parse_probe_trace_command(const char *cmd, | |
897 | struct probe_trace_event *tev) | |
4de189fe | 898 | { |
0e60836b | 899 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
900 | char pr; |
901 | char *p; | |
902 | int ret, i, argc; | |
903 | char **argv; | |
904 | ||
0e60836b | 905 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 906 | argv = argv_split(cmd, &argc); |
146a1439 MH |
907 | if (!argv) { |
908 | pr_debug("Failed to split arguments.\n"); | |
909 | return -ENOMEM; | |
910 | } | |
911 | if (argc < 2) { | |
912 | semantic_error("Too few probe arguments.\n"); | |
913 | ret = -ERANGE; | |
914 | goto out; | |
915 | } | |
4de189fe MH |
916 | |
917 | /* Scan event and group name. */ | |
93aaa45a | 918 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
919 | &pr, (float *)(void *)&tev->group, |
920 | (float *)(void *)&tev->event); | |
146a1439 MH |
921 | if (ret != 3) { |
922 | semantic_error("Failed to parse event name: %s\n", argv[0]); | |
923 | ret = -EINVAL; | |
924 | goto out; | |
925 | } | |
4235b045 | 926 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 927 | |
4235b045 | 928 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
929 | |
930 | /* Scan function name and offset */ | |
4235b045 MH |
931 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
932 | &tp->offset); | |
4de189fe | 933 | if (ret == 1) |
4235b045 | 934 | tp->offset = 0; |
4de189fe | 935 | |
4235b045 | 936 | tev->nargs = argc - 2; |
0e60836b | 937 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
938 | if (tev->args == NULL) { |
939 | ret = -ENOMEM; | |
940 | goto out; | |
941 | } | |
4235b045 | 942 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
943 | p = strchr(argv[i + 2], '='); |
944 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
945 | *p++ = '\0'; |
946 | else | |
947 | p = argv[i + 2]; | |
02b95dad | 948 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 949 | /* TODO: parse regs and offset */ |
02b95dad MH |
950 | tev->args[i].value = strdup(p); |
951 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
952 | ret = -ENOMEM; | |
953 | goto out; | |
954 | } | |
4de189fe | 955 | } |
146a1439 MH |
956 | ret = 0; |
957 | out: | |
4de189fe | 958 | argv_free(argv); |
146a1439 | 959 | return ret; |
4de189fe MH |
960 | } |
961 | ||
7df2f329 MH |
962 | /* Compose only probe arg */ |
963 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
964 | { | |
965 | struct perf_probe_arg_field *field = pa->field; | |
966 | int ret; | |
967 | char *tmp = buf; | |
968 | ||
48481938 MH |
969 | if (pa->name && pa->var) |
970 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
971 | else | |
972 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
973 | if (ret <= 0) |
974 | goto error; | |
975 | tmp += ret; | |
976 | len -= ret; | |
977 | ||
978 | while (field) { | |
b2a3c12b MH |
979 | if (field->name[0] == '[') |
980 | ret = e_snprintf(tmp, len, "%s", field->name); | |
981 | else | |
982 | ret = e_snprintf(tmp, len, "%s%s", | |
983 | field->ref ? "->" : ".", field->name); | |
7df2f329 MH |
984 | if (ret <= 0) |
985 | goto error; | |
986 | tmp += ret; | |
987 | len -= ret; | |
988 | field = field->next; | |
989 | } | |
11a1ca35 MH |
990 | |
991 | if (pa->type) { | |
992 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
993 | if (ret <= 0) | |
994 | goto error; | |
995 | tmp += ret; | |
996 | len -= ret; | |
997 | } | |
998 | ||
7df2f329 MH |
999 | return tmp - buf; |
1000 | error: | |
0e43e5d2 | 1001 | pr_debug("Failed to synthesize perf probe argument: %s\n", |
146a1439 MH |
1002 | strerror(-ret)); |
1003 | return ret; | |
7df2f329 MH |
1004 | } |
1005 | ||
4235b045 MH |
1006 | /* Compose only probe point (not argument) */ |
1007 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 1008 | { |
fb1587d8 MH |
1009 | char *buf, *tmp; |
1010 | char offs[32] = "", line[32] = "", file[32] = ""; | |
1011 | int ret, len; | |
4de189fe | 1012 | |
e334016f MH |
1013 | buf = zalloc(MAX_CMDLEN); |
1014 | if (buf == NULL) { | |
1015 | ret = -ENOMEM; | |
1016 | goto error; | |
1017 | } | |
4de189fe | 1018 | if (pp->offset) { |
fb1587d8 | 1019 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
1020 | if (ret <= 0) |
1021 | goto error; | |
1022 | } | |
1023 | if (pp->line) { | |
fb1587d8 MH |
1024 | ret = e_snprintf(line, 32, ":%d", pp->line); |
1025 | if (ret <= 0) | |
1026 | goto error; | |
1027 | } | |
1028 | if (pp->file) { | |
dd259c5d | 1029 | len = strlen(pp->file) - 31; |
fb1587d8 MH |
1030 | if (len < 0) |
1031 | len = 0; | |
1032 | tmp = strchr(pp->file + len, '/'); | |
1033 | if (!tmp) | |
dd259c5d | 1034 | tmp = pp->file + len; |
fb1587d8 | 1035 | ret = e_snprintf(file, 32, "@%s", tmp + 1); |
4de189fe MH |
1036 | if (ret <= 0) |
1037 | goto error; | |
1038 | } | |
1039 | ||
1040 | if (pp->function) | |
fb1587d8 MH |
1041 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
1042 | offs, pp->retprobe ? "%return" : "", line, | |
1043 | file); | |
4de189fe | 1044 | else |
fb1587d8 | 1045 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
1046 | if (ret <= 0) |
1047 | goto error; | |
1048 | ||
1049 | return buf; | |
7ef17aaf | 1050 | error: |
0e43e5d2 | 1051 | pr_debug("Failed to synthesize perf probe point: %s\n", |
146a1439 | 1052 | strerror(-ret)); |
e334016f MH |
1053 | if (buf) |
1054 | free(buf); | |
146a1439 | 1055 | return NULL; |
7ef17aaf MH |
1056 | } |
1057 | ||
4235b045 MH |
1058 | #if 0 |
1059 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
1060 | { |
1061 | char *buf; | |
1062 | int i, len, ret; | |
1063 | ||
4235b045 MH |
1064 | buf = synthesize_perf_probe_point(&pev->point); |
1065 | if (!buf) | |
1066 | return NULL; | |
4de189fe | 1067 | |
4235b045 MH |
1068 | len = strlen(buf); |
1069 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 1070 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
1071 | pev->args[i].name); |
1072 | if (ret <= 0) { | |
1073 | free(buf); | |
1074 | return NULL; | |
1075 | } | |
4de189fe MH |
1076 | len += ret; |
1077 | } | |
4de189fe | 1078 | |
4235b045 MH |
1079 | return buf; |
1080 | } | |
1081 | #endif | |
1082 | ||
0e60836b | 1083 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
4235b045 MH |
1084 | char **buf, size_t *buflen, |
1085 | int depth) | |
1086 | { | |
1087 | int ret; | |
1088 | if (ref->next) { | |
0e60836b | 1089 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
4235b045 MH |
1090 | buflen, depth + 1); |
1091 | if (depth < 0) | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
1096 | if (ret < 0) | |
1097 | depth = ret; | |
1098 | else { | |
1099 | *buf += ret; | |
1100 | *buflen -= ret; | |
1101 | } | |
1102 | out: | |
1103 | return depth; | |
4de189fe | 1104 | |
4de189fe MH |
1105 | } |
1106 | ||
0e60836b | 1107 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
4235b045 | 1108 | char *buf, size_t buflen) |
50656eec | 1109 | { |
0e60836b | 1110 | struct probe_trace_arg_ref *ref = arg->ref; |
4235b045 MH |
1111 | int ret, depth = 0; |
1112 | char *tmp = buf; | |
1113 | ||
1114 | /* Argument name or separator */ | |
1115 | if (arg->name) | |
1116 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
1117 | else | |
1118 | ret = e_snprintf(buf, buflen, " "); | |
1119 | if (ret < 0) | |
1120 | return ret; | |
1121 | buf += ret; | |
1122 | buflen -= ret; | |
1123 | ||
b7dcb857 MH |
1124 | /* Special case: @XXX */ |
1125 | if (arg->value[0] == '@' && arg->ref) | |
1126 | ref = ref->next; | |
1127 | ||
4235b045 | 1128 | /* Dereferencing arguments */ |
b7dcb857 | 1129 | if (ref) { |
0e60836b | 1130 | depth = __synthesize_probe_trace_arg_ref(ref, &buf, |
4235b045 MH |
1131 | &buflen, 1); |
1132 | if (depth < 0) | |
1133 | return depth; | |
1134 | } | |
1135 | ||
1136 | /* Print argument value */ | |
b7dcb857 MH |
1137 | if (arg->value[0] == '@' && arg->ref) |
1138 | ret = e_snprintf(buf, buflen, "%s%+ld", arg->value, | |
1139 | arg->ref->offset); | |
1140 | else | |
1141 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
4235b045 MH |
1142 | if (ret < 0) |
1143 | return ret; | |
1144 | buf += ret; | |
1145 | buflen -= ret; | |
1146 | ||
1147 | /* Closing */ | |
1148 | while (depth--) { | |
1149 | ret = e_snprintf(buf, buflen, ")"); | |
1150 | if (ret < 0) | |
1151 | return ret; | |
1152 | buf += ret; | |
1153 | buflen -= ret; | |
1154 | } | |
4984912e MH |
1155 | /* Print argument type */ |
1156 | if (arg->type) { | |
1157 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
1158 | if (ret <= 0) | |
1159 | return ret; | |
1160 | buf += ret; | |
1161 | } | |
4235b045 MH |
1162 | |
1163 | return buf - tmp; | |
1164 | } | |
1165 | ||
0e60836b | 1166 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1167 | { |
0e60836b | 1168 | struct probe_trace_point *tp = &tev->point; |
50656eec MH |
1169 | char *buf; |
1170 | int i, len, ret; | |
1171 | ||
e334016f MH |
1172 | buf = zalloc(MAX_CMDLEN); |
1173 | if (buf == NULL) | |
1174 | return NULL; | |
1175 | ||
4235b045 MH |
1176 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", |
1177 | tp->retprobe ? 'r' : 'p', | |
1178 | tev->group, tev->event, | |
1179 | tp->symbol, tp->offset); | |
1180 | if (len <= 0) | |
50656eec | 1181 | goto error; |
50656eec | 1182 | |
4235b045 | 1183 | for (i = 0; i < tev->nargs; i++) { |
0e60836b | 1184 | ret = synthesize_probe_trace_arg(&tev->args[i], buf + len, |
4235b045 | 1185 | MAX_CMDLEN - len); |
4de189fe | 1186 | if (ret <= 0) |
50656eec MH |
1187 | goto error; |
1188 | len += ret; | |
1189 | } | |
50656eec | 1190 | |
4235b045 | 1191 | return buf; |
50656eec | 1192 | error: |
4235b045 MH |
1193 | free(buf); |
1194 | return NULL; | |
1195 | } | |
50656eec | 1196 | |
0e60836b | 1197 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
469b9b88 | 1198 | struct perf_probe_event *pev) |
4235b045 | 1199 | { |
02b95dad | 1200 | char buf[64] = ""; |
146a1439 | 1201 | int i, ret; |
4235b045 | 1202 | |
4b4da7f7 | 1203 | /* Convert event/group name */ |
02b95dad MH |
1204 | pev->event = strdup(tev->event); |
1205 | pev->group = strdup(tev->group); | |
1206 | if (pev->event == NULL || pev->group == NULL) | |
1207 | return -ENOMEM; | |
fb1587d8 | 1208 | |
4b4da7f7 | 1209 | /* Convert trace_point to probe_point */ |
0e60836b | 1210 | ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point); |
146a1439 MH |
1211 | if (ret < 0) |
1212 | return ret; | |
4b4da7f7 | 1213 | |
4235b045 MH |
1214 | /* Convert trace_arg to probe_arg */ |
1215 | pev->nargs = tev->nargs; | |
e334016f MH |
1216 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1217 | if (pev->args == NULL) | |
1218 | return -ENOMEM; | |
02b95dad | 1219 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1220 | if (tev->args[i].name) |
02b95dad | 1221 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1222 | else { |
0e60836b | 1223 | ret = synthesize_probe_trace_arg(&tev->args[i], |
146a1439 | 1224 | buf, 64); |
02b95dad | 1225 | pev->args[i].name = strdup(buf); |
4235b045 | 1226 | } |
02b95dad MH |
1227 | if (pev->args[i].name == NULL && ret >= 0) |
1228 | ret = -ENOMEM; | |
1229 | } | |
146a1439 MH |
1230 | |
1231 | if (ret < 0) | |
1232 | clear_perf_probe_event(pev); | |
1233 | ||
1234 | return ret; | |
4235b045 MH |
1235 | } |
1236 | ||
1237 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
1238 | { | |
1239 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 1240 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
1241 | int i; |
1242 | ||
1243 | if (pev->event) | |
1244 | free(pev->event); | |
1245 | if (pev->group) | |
1246 | free(pev->group); | |
1247 | if (pp->file) | |
1248 | free(pp->file); | |
1249 | if (pp->function) | |
1250 | free(pp->function); | |
1251 | if (pp->lazy_line) | |
1252 | free(pp->lazy_line); | |
7df2f329 | 1253 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
1254 | if (pev->args[i].name) |
1255 | free(pev->args[i].name); | |
48481938 MH |
1256 | if (pev->args[i].var) |
1257 | free(pev->args[i].var); | |
11a1ca35 MH |
1258 | if (pev->args[i].type) |
1259 | free(pev->args[i].type); | |
7df2f329 MH |
1260 | field = pev->args[i].field; |
1261 | while (field) { | |
1262 | next = field->next; | |
1263 | if (field->name) | |
1264 | free(field->name); | |
1265 | free(field); | |
1266 | field = next; | |
1267 | } | |
1268 | } | |
4235b045 MH |
1269 | if (pev->args) |
1270 | free(pev->args); | |
1271 | memset(pev, 0, sizeof(*pev)); | |
1272 | } | |
1273 | ||
0e60836b | 1274 | static void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 1275 | { |
0e60836b | 1276 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
1277 | int i; |
1278 | ||
1279 | if (tev->event) | |
1280 | free(tev->event); | |
1281 | if (tev->group) | |
1282 | free(tev->group); | |
1283 | if (tev->point.symbol) | |
1284 | free(tev->point.symbol); | |
1285 | for (i = 0; i < tev->nargs; i++) { | |
1286 | if (tev->args[i].name) | |
1287 | free(tev->args[i].name); | |
1288 | if (tev->args[i].value) | |
1289 | free(tev->args[i].value); | |
4984912e MH |
1290 | if (tev->args[i].type) |
1291 | free(tev->args[i].type); | |
4235b045 MH |
1292 | ref = tev->args[i].ref; |
1293 | while (ref) { | |
1294 | next = ref->next; | |
1295 | free(ref); | |
1296 | ref = next; | |
1297 | } | |
1298 | } | |
1299 | if (tev->args) | |
1300 | free(tev->args); | |
1301 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
1302 | } |
1303 | ||
f4d7da49 | 1304 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
1305 | { |
1306 | char buf[PATH_MAX]; | |
7ca5989d | 1307 | const char *__debugfs; |
4de189fe MH |
1308 | int ret; |
1309 | ||
7ca5989d MH |
1310 | __debugfs = debugfs_find_mountpoint(); |
1311 | if (__debugfs == NULL) { | |
1312 | pr_warning("Debugfs is not mounted.\n"); | |
1313 | return -ENOENT; | |
1314 | } | |
1315 | ||
1316 | ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs); | |
146a1439 | 1317 | if (ret >= 0) { |
7ca5989d | 1318 | pr_debug("Opening %s write=%d\n", buf, readwrite); |
146a1439 MH |
1319 | if (readwrite && !probe_event_dry_run) |
1320 | ret = open(buf, O_RDWR, O_APPEND); | |
1321 | else | |
1322 | ret = open(buf, O_RDONLY, 0); | |
1323 | } | |
f4d7da49 | 1324 | |
4de189fe MH |
1325 | if (ret < 0) { |
1326 | if (errno == ENOENT) | |
146a1439 MH |
1327 | pr_warning("kprobe_events file does not exist - please" |
1328 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); | |
4de189fe | 1329 | else |
146a1439 MH |
1330 | pr_warning("Failed to open kprobe_events file: %s\n", |
1331 | strerror(errno)); | |
4de189fe MH |
1332 | } |
1333 | return ret; | |
1334 | } | |
1335 | ||
1336 | /* Get raw string list of current kprobe_events */ | |
0e60836b | 1337 | static struct strlist *get_probe_trace_command_rawlist(int fd) |
4de189fe MH |
1338 | { |
1339 | int ret, idx; | |
1340 | FILE *fp; | |
1341 | char buf[MAX_CMDLEN]; | |
1342 | char *p; | |
1343 | struct strlist *sl; | |
1344 | ||
1345 | sl = strlist__new(true, NULL); | |
1346 | ||
1347 | fp = fdopen(dup(fd), "r"); | |
1348 | while (!feof(fp)) { | |
1349 | p = fgets(buf, MAX_CMDLEN, fp); | |
1350 | if (!p) | |
1351 | break; | |
1352 | ||
1353 | idx = strlen(p) - 1; | |
1354 | if (p[idx] == '\n') | |
1355 | p[idx] = '\0'; | |
1356 | ret = strlist__add(sl, buf); | |
146a1439 MH |
1357 | if (ret < 0) { |
1358 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); | |
1359 | strlist__delete(sl); | |
1360 | return NULL; | |
1361 | } | |
4de189fe MH |
1362 | } |
1363 | fclose(fp); | |
1364 | ||
1365 | return sl; | |
1366 | } | |
1367 | ||
278498d4 | 1368 | /* Show an event */ |
146a1439 | 1369 | static int show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 1370 | { |
7e990a51 | 1371 | int i, ret; |
278498d4 | 1372 | char buf[128]; |
4235b045 | 1373 | char *place; |
278498d4 | 1374 | |
4235b045 MH |
1375 | /* Synthesize only event probe point */ |
1376 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
1377 | if (!place) |
1378 | return -EINVAL; | |
4235b045 MH |
1379 | |
1380 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 | 1381 | if (ret < 0) |
146a1439 MH |
1382 | return ret; |
1383 | ||
fb1587d8 | 1384 | printf(" %-20s (on %s", buf, place); |
278498d4 | 1385 | |
4235b045 | 1386 | if (pev->nargs > 0) { |
278498d4 | 1387 | printf(" with"); |
7df2f329 | 1388 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
1389 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1390 | buf, 128); | |
1391 | if (ret < 0) | |
1392 | break; | |
7df2f329 MH |
1393 | printf(" %s", buf); |
1394 | } | |
278498d4 MH |
1395 | } |
1396 | printf(")\n"); | |
4235b045 | 1397 | free(place); |
146a1439 | 1398 | return ret; |
278498d4 MH |
1399 | } |
1400 | ||
4de189fe | 1401 | /* List up current perf-probe events */ |
146a1439 | 1402 | int show_perf_probe_events(void) |
4de189fe | 1403 | { |
146a1439 | 1404 | int fd, ret; |
0e60836b | 1405 | struct probe_trace_event tev; |
4235b045 | 1406 | struct perf_probe_event pev; |
4de189fe MH |
1407 | struct strlist *rawlist; |
1408 | struct str_node *ent; | |
1409 | ||
72041334 | 1410 | setup_pager(); |
146a1439 MH |
1411 | ret = init_vmlinux(); |
1412 | if (ret < 0) | |
1413 | return ret; | |
4235b045 MH |
1414 | |
1415 | memset(&tev, 0, sizeof(tev)); | |
1416 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 1417 | |
f4d7da49 | 1418 | fd = open_kprobe_events(false); |
146a1439 MH |
1419 | if (fd < 0) |
1420 | return fd; | |
1421 | ||
0e60836b | 1422 | rawlist = get_probe_trace_command_rawlist(fd); |
4de189fe | 1423 | close(fd); |
146a1439 MH |
1424 | if (!rawlist) |
1425 | return -ENOENT; | |
4de189fe | 1426 | |
adf365f4 | 1427 | strlist__for_each(ent, rawlist) { |
0e60836b | 1428 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1429 | if (ret >= 0) { |
1430 | ret = convert_to_perf_probe_event(&tev, &pev); | |
1431 | if (ret >= 0) | |
1432 | ret = show_perf_probe_event(&pev); | |
1433 | } | |
4235b045 | 1434 | clear_perf_probe_event(&pev); |
0e60836b | 1435 | clear_probe_trace_event(&tev); |
146a1439 MH |
1436 | if (ret < 0) |
1437 | break; | |
4de189fe | 1438 | } |
4de189fe | 1439 | strlist__delete(rawlist); |
146a1439 MH |
1440 | |
1441 | return ret; | |
4de189fe MH |
1442 | } |
1443 | ||
b498ce1f | 1444 | /* Get current perf-probe event names */ |
0e60836b | 1445 | static struct strlist *get_probe_trace_event_names(int fd, bool include_group) |
b498ce1f | 1446 | { |
fa28244d | 1447 | char buf[128]; |
b498ce1f MH |
1448 | struct strlist *sl, *rawlist; |
1449 | struct str_node *ent; | |
0e60836b | 1450 | struct probe_trace_event tev; |
146a1439 | 1451 | int ret = 0; |
b498ce1f | 1452 | |
4235b045 | 1453 | memset(&tev, 0, sizeof(tev)); |
0e60836b | 1454 | rawlist = get_probe_trace_command_rawlist(fd); |
e1d2017b | 1455 | sl = strlist__new(true, NULL); |
adf365f4 | 1456 | strlist__for_each(ent, rawlist) { |
0e60836b | 1457 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1458 | if (ret < 0) |
1459 | break; | |
fa28244d | 1460 | if (include_group) { |
146a1439 MH |
1461 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1462 | tev.event); | |
1463 | if (ret >= 0) | |
1464 | ret = strlist__add(sl, buf); | |
fa28244d | 1465 | } else |
146a1439 | 1466 | ret = strlist__add(sl, tev.event); |
0e60836b | 1467 | clear_probe_trace_event(&tev); |
146a1439 MH |
1468 | if (ret < 0) |
1469 | break; | |
b498ce1f | 1470 | } |
b498ce1f MH |
1471 | strlist__delete(rawlist); |
1472 | ||
146a1439 MH |
1473 | if (ret < 0) { |
1474 | strlist__delete(sl); | |
1475 | return NULL; | |
1476 | } | |
b498ce1f MH |
1477 | return sl; |
1478 | } | |
1479 | ||
0e60836b | 1480 | static int write_probe_trace_event(int fd, struct probe_trace_event *tev) |
50656eec | 1481 | { |
6eca8cc3 | 1482 | int ret = 0; |
0e60836b | 1483 | char *buf = synthesize_probe_trace_command(tev); |
50656eec | 1484 | |
146a1439 | 1485 | if (!buf) { |
0e60836b | 1486 | pr_debug("Failed to synthesize probe trace event.\n"); |
146a1439 MH |
1487 | return -EINVAL; |
1488 | } | |
1489 | ||
fa28244d | 1490 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1491 | if (!probe_event_dry_run) { |
1492 | ret = write(fd, buf, strlen(buf)); | |
1493 | if (ret <= 0) | |
146a1439 MH |
1494 | pr_warning("Failed to write event: %s\n", |
1495 | strerror(errno)); | |
f4d7da49 | 1496 | } |
4235b045 | 1497 | free(buf); |
146a1439 | 1498 | return ret; |
50656eec MH |
1499 | } |
1500 | ||
146a1439 MH |
1501 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1502 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
1503 | { |
1504 | int i, ret; | |
17f88fcd MH |
1505 | |
1506 | /* Try no suffix */ | |
1507 | ret = e_snprintf(buf, len, "%s", base); | |
146a1439 MH |
1508 | if (ret < 0) { |
1509 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1510 | return ret; | |
1511 | } | |
17f88fcd | 1512 | if (!strlist__has_entry(namelist, buf)) |
146a1439 | 1513 | return 0; |
17f88fcd | 1514 | |
d761b08b MH |
1515 | if (!allow_suffix) { |
1516 | pr_warning("Error: event \"%s\" already exists. " | |
1517 | "(Use -f to force duplicates.)\n", base); | |
146a1439 | 1518 | return -EEXIST; |
d761b08b MH |
1519 | } |
1520 | ||
17f88fcd MH |
1521 | /* Try to add suffix */ |
1522 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f | 1523 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
146a1439 MH |
1524 | if (ret < 0) { |
1525 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1526 | return ret; | |
1527 | } | |
b498ce1f MH |
1528 | if (!strlist__has_entry(namelist, buf)) |
1529 | break; | |
1530 | } | |
146a1439 MH |
1531 | if (i == MAX_EVENT_INDEX) { |
1532 | pr_warning("Too many events are on the same function.\n"); | |
1533 | ret = -ERANGE; | |
1534 | } | |
1535 | ||
1536 | return ret; | |
b498ce1f MH |
1537 | } |
1538 | ||
0e60836b SD |
1539 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
1540 | struct probe_trace_event *tevs, | |
146a1439 | 1541 | int ntevs, bool allow_suffix) |
50656eec | 1542 | { |
146a1439 | 1543 | int i, fd, ret; |
0e60836b | 1544 | struct probe_trace_event *tev = NULL; |
4235b045 MH |
1545 | char buf[64]; |
1546 | const char *event, *group; | |
b498ce1f | 1547 | struct strlist *namelist; |
50656eec | 1548 | |
f4d7da49 | 1549 | fd = open_kprobe_events(true); |
146a1439 MH |
1550 | if (fd < 0) |
1551 | return fd; | |
b498ce1f | 1552 | /* Get current event names */ |
0e60836b | 1553 | namelist = get_probe_trace_event_names(fd, false); |
146a1439 MH |
1554 | if (!namelist) { |
1555 | pr_debug("Failed to get current event list.\n"); | |
1556 | return -EIO; | |
1557 | } | |
4235b045 | 1558 | |
146a1439 | 1559 | ret = 0; |
4235b045 | 1560 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
02b95dad | 1561 | for (i = 0; i < ntevs; i++) { |
4235b045 MH |
1562 | tev = &tevs[i]; |
1563 | if (pev->event) | |
1564 | event = pev->event; | |
1565 | else | |
1566 | if (pev->point.function) | |
1567 | event = pev->point.function; | |
1568 | else | |
1569 | event = tev->point.symbol; | |
1570 | if (pev->group) | |
1571 | group = pev->group; | |
1572 | else | |
1573 | group = PERFPROBE_GROUP; | |
1574 | ||
1575 | /* Get an unused new event name */ | |
146a1439 MH |
1576 | ret = get_new_event_name(buf, 64, event, |
1577 | namelist, allow_suffix); | |
1578 | if (ret < 0) | |
1579 | break; | |
4235b045 MH |
1580 | event = buf; |
1581 | ||
02b95dad MH |
1582 | tev->event = strdup(event); |
1583 | tev->group = strdup(group); | |
1584 | if (tev->event == NULL || tev->group == NULL) { | |
1585 | ret = -ENOMEM; | |
1586 | break; | |
1587 | } | |
0e60836b | 1588 | ret = write_probe_trace_event(fd, tev); |
146a1439 MH |
1589 | if (ret < 0) |
1590 | break; | |
4235b045 MH |
1591 | /* Add added event name to namelist */ |
1592 | strlist__add(namelist, event); | |
1593 | ||
1594 | /* Trick here - save current event/group */ | |
1595 | event = pev->event; | |
1596 | group = pev->group; | |
1597 | pev->event = tev->event; | |
1598 | pev->group = tev->group; | |
1599 | show_perf_probe_event(pev); | |
1600 | /* Trick here - restore current event/group */ | |
1601 | pev->event = (char *)event; | |
1602 | pev->group = (char *)group; | |
1603 | ||
1604 | /* | |
1605 | * Probes after the first probe which comes from same | |
1606 | * user input are always allowed to add suffix, because | |
1607 | * there might be several addresses corresponding to | |
1608 | * one code line. | |
1609 | */ | |
1610 | allow_suffix = true; | |
50656eec | 1611 | } |
146a1439 MH |
1612 | |
1613 | if (ret >= 0) { | |
1614 | /* Show how to use the event. */ | |
1615 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
1616 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, | |
1617 | tev->event); | |
1618 | } | |
a9b495b0 | 1619 | |
e1d2017b | 1620 | strlist__delete(namelist); |
50656eec | 1621 | close(fd); |
146a1439 | 1622 | return ret; |
50656eec | 1623 | } |
fa28244d | 1624 | |
0e60836b SD |
1625 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
1626 | struct probe_trace_event **tevs, | |
469b9b88 | 1627 | int max_tevs, const char *module) |
e0faa8d3 MH |
1628 | { |
1629 | struct symbol *sym; | |
e334016f | 1630 | int ret = 0, i; |
0e60836b | 1631 | struct probe_trace_event *tev; |
4235b045 | 1632 | |
4b4da7f7 | 1633 | /* Convert perf_probe_event with debuginfo */ |
469b9b88 | 1634 | ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module); |
e334016f MH |
1635 | if (ret != 0) |
1636 | return ret; | |
e0faa8d3 | 1637 | |
4235b045 | 1638 | /* Allocate trace event buffer */ |
0e60836b | 1639 | tev = *tevs = zalloc(sizeof(struct probe_trace_event)); |
e334016f MH |
1640 | if (tev == NULL) |
1641 | return -ENOMEM; | |
4235b045 MH |
1642 | |
1643 | /* Copy parameters */ | |
02b95dad MH |
1644 | tev->point.symbol = strdup(pev->point.function); |
1645 | if (tev->point.symbol == NULL) { | |
1646 | ret = -ENOMEM; | |
1647 | goto error; | |
1648 | } | |
4235b045 | 1649 | tev->point.offset = pev->point.offset; |
04ddd04b | 1650 | tev->point.retprobe = pev->point.retprobe; |
4235b045 MH |
1651 | tev->nargs = pev->nargs; |
1652 | if (tev->nargs) { | |
0e60836b | 1653 | tev->args = zalloc(sizeof(struct probe_trace_arg) |
e334016f MH |
1654 | * tev->nargs); |
1655 | if (tev->args == NULL) { | |
02b95dad MH |
1656 | ret = -ENOMEM; |
1657 | goto error; | |
e334016f | 1658 | } |
48481938 | 1659 | for (i = 0; i < tev->nargs; i++) { |
02b95dad MH |
1660 | if (pev->args[i].name) { |
1661 | tev->args[i].name = strdup(pev->args[i].name); | |
1662 | if (tev->args[i].name == NULL) { | |
1663 | ret = -ENOMEM; | |
1664 | goto error; | |
1665 | } | |
1666 | } | |
1667 | tev->args[i].value = strdup(pev->args[i].var); | |
1668 | if (tev->args[i].value == NULL) { | |
1669 | ret = -ENOMEM; | |
1670 | goto error; | |
1671 | } | |
1672 | if (pev->args[i].type) { | |
1673 | tev->args[i].type = strdup(pev->args[i].type); | |
1674 | if (tev->args[i].type == NULL) { | |
1675 | ret = -ENOMEM; | |
1676 | goto error; | |
1677 | } | |
1678 | } | |
48481938 | 1679 | } |
4235b045 MH |
1680 | } |
1681 | ||
1682 | /* Currently just checking function name from symbol map */ | |
469b9b88 | 1683 | sym = __find_kernel_function_by_name(tev->point.symbol, NULL); |
146a1439 MH |
1684 | if (!sym) { |
1685 | pr_warning("Kernel symbol \'%s\' not found.\n", | |
1686 | tev->point.symbol); | |
02b95dad MH |
1687 | ret = -ENOENT; |
1688 | goto error; | |
1689 | } | |
e334016f | 1690 | |
02b95dad MH |
1691 | return 1; |
1692 | error: | |
0e60836b | 1693 | clear_probe_trace_event(tev); |
02b95dad MH |
1694 | free(tev); |
1695 | *tevs = NULL; | |
e334016f | 1696 | return ret; |
4235b045 MH |
1697 | } |
1698 | ||
1699 | struct __event_package { | |
1700 | struct perf_probe_event *pev; | |
0e60836b | 1701 | struct probe_trace_event *tevs; |
4235b045 MH |
1702 | int ntevs; |
1703 | }; | |
1704 | ||
146a1439 | 1705 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
469b9b88 | 1706 | int max_tevs, const char *module, bool force_add) |
4235b045 | 1707 | { |
146a1439 | 1708 | int i, j, ret; |
4235b045 MH |
1709 | struct __event_package *pkgs; |
1710 | ||
e334016f MH |
1711 | pkgs = zalloc(sizeof(struct __event_package) * npevs); |
1712 | if (pkgs == NULL) | |
1713 | return -ENOMEM; | |
4235b045 MH |
1714 | |
1715 | /* Init vmlinux path */ | |
146a1439 | 1716 | ret = init_vmlinux(); |
449e5b24 MH |
1717 | if (ret < 0) { |
1718 | free(pkgs); | |
146a1439 | 1719 | return ret; |
449e5b24 | 1720 | } |
4235b045 MH |
1721 | |
1722 | /* Loop 1: convert all events */ | |
1723 | for (i = 0; i < npevs; i++) { | |
1724 | pkgs[i].pev = &pevs[i]; | |
1725 | /* Convert with or without debuginfo */ | |
0e60836b | 1726 | ret = convert_to_probe_trace_events(pkgs[i].pev, |
469b9b88 MH |
1727 | &pkgs[i].tevs, |
1728 | max_tevs, | |
1729 | module); | |
146a1439 MH |
1730 | if (ret < 0) |
1731 | goto end; | |
1732 | pkgs[i].ntevs = ret; | |
e0faa8d3 MH |
1733 | } |
1734 | ||
4235b045 | 1735 | /* Loop 2: add all events */ |
146a1439 | 1736 | for (i = 0; i < npevs && ret >= 0; i++) |
0e60836b | 1737 | ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs, |
146a1439 MH |
1738 | pkgs[i].ntevs, force_add); |
1739 | end: | |
449e5b24 MH |
1740 | /* Loop 3: cleanup and free trace events */ |
1741 | for (i = 0; i < npevs; i++) { | |
146a1439 | 1742 | for (j = 0; j < pkgs[i].ntevs; j++) |
0e60836b | 1743 | clear_probe_trace_event(&pkgs[i].tevs[j]); |
449e5b24 MH |
1744 | free(pkgs[i].tevs); |
1745 | } | |
1746 | free(pkgs); | |
146a1439 MH |
1747 | |
1748 | return ret; | |
e0faa8d3 MH |
1749 | } |
1750 | ||
0e60836b | 1751 | static int __del_trace_probe_event(int fd, struct str_node *ent) |
bbbb521b MH |
1752 | { |
1753 | char *p; | |
1754 | char buf[128]; | |
4235b045 | 1755 | int ret; |
bbbb521b | 1756 | |
0e60836b | 1757 | /* Convert from perf-probe event to trace-probe event */ |
146a1439 MH |
1758 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1759 | if (ret < 0) | |
1760 | goto error; | |
1761 | ||
bbbb521b | 1762 | p = strchr(buf + 2, ':'); |
146a1439 MH |
1763 | if (!p) { |
1764 | pr_debug("Internal error: %s should have ':' but not.\n", | |
1765 | ent->s); | |
1766 | ret = -ENOTSUP; | |
1767 | goto error; | |
1768 | } | |
bbbb521b MH |
1769 | *p = '/'; |
1770 | ||
4235b045 MH |
1771 | pr_debug("Writing event: %s\n", buf); |
1772 | ret = write(fd, buf, strlen(buf)); | |
146a1439 MH |
1773 | if (ret < 0) |
1774 | goto error; | |
1775 | ||
bbbb521b | 1776 | printf("Remove event: %s\n", ent->s); |
146a1439 MH |
1777 | return 0; |
1778 | error: | |
1779 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); | |
1780 | return ret; | |
bbbb521b MH |
1781 | } |
1782 | ||
0e60836b | 1783 | static int del_trace_probe_event(int fd, const char *group, |
146a1439 | 1784 | const char *event, struct strlist *namelist) |
fa28244d MH |
1785 | { |
1786 | char buf[128]; | |
bbbb521b | 1787 | struct str_node *ent, *n; |
146a1439 | 1788 | int found = 0, ret = 0; |
fa28244d | 1789 | |
146a1439 MH |
1790 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1791 | if (ret < 0) { | |
0e43e5d2 | 1792 | pr_err("Failed to copy event.\n"); |
146a1439 MH |
1793 | return ret; |
1794 | } | |
fa28244d | 1795 | |
bbbb521b MH |
1796 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1797 | strlist__for_each_safe(ent, n, namelist) | |
1798 | if (strglobmatch(ent->s, buf)) { | |
1799 | found++; | |
0e60836b | 1800 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1801 | if (ret < 0) |
1802 | break; | |
bbbb521b MH |
1803 | strlist__remove(namelist, ent); |
1804 | } | |
1805 | } else { | |
1806 | ent = strlist__find(namelist, buf); | |
1807 | if (ent) { | |
1808 | found++; | |
0e60836b | 1809 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1810 | if (ret >= 0) |
1811 | strlist__remove(namelist, ent); | |
bbbb521b MH |
1812 | } |
1813 | } | |
146a1439 MH |
1814 | if (found == 0 && ret >= 0) |
1815 | pr_info("Info: Event \"%s\" does not exist.\n", buf); | |
1816 | ||
1817 | return ret; | |
fa28244d MH |
1818 | } |
1819 | ||
146a1439 | 1820 | int del_perf_probe_events(struct strlist *dellist) |
fa28244d | 1821 | { |
146a1439 | 1822 | int fd, ret = 0; |
fa28244d MH |
1823 | const char *group, *event; |
1824 | char *p, *str; | |
1825 | struct str_node *ent; | |
1826 | struct strlist *namelist; | |
1827 | ||
f4d7da49 | 1828 | fd = open_kprobe_events(true); |
146a1439 MH |
1829 | if (fd < 0) |
1830 | return fd; | |
1831 | ||
fa28244d | 1832 | /* Get current event names */ |
0e60836b | 1833 | namelist = get_probe_trace_event_names(fd, true); |
146a1439 MH |
1834 | if (namelist == NULL) |
1835 | return -EINVAL; | |
fa28244d | 1836 | |
adf365f4 | 1837 | strlist__for_each(ent, dellist) { |
02b95dad MH |
1838 | str = strdup(ent->s); |
1839 | if (str == NULL) { | |
1840 | ret = -ENOMEM; | |
1841 | break; | |
1842 | } | |
bbbb521b | 1843 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1844 | p = strchr(str, ':'); |
1845 | if (p) { | |
1846 | group = str; | |
1847 | *p = '\0'; | |
1848 | event = p + 1; | |
1849 | } else { | |
bbbb521b | 1850 | group = "*"; |
fa28244d MH |
1851 | event = str; |
1852 | } | |
bbbb521b | 1853 | pr_debug("Group: %s, Event: %s\n", group, event); |
0e60836b | 1854 | ret = del_trace_probe_event(fd, group, event, namelist); |
fa28244d | 1855 | free(str); |
146a1439 MH |
1856 | if (ret < 0) |
1857 | break; | |
fa28244d MH |
1858 | } |
1859 | strlist__delete(namelist); | |
1860 | close(fd); | |
146a1439 MH |
1861 | |
1862 | return ret; | |
fa28244d MH |
1863 | } |
1864 |