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Commit | Line | Data |
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413d37d1 MH |
1 | /* |
2 | * kprobe based kernel tracer | |
3 | * | |
4 | * Created 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 version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/kprobes.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/smp.h> | |
26 | #include <linux/debugfs.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/ptrace.h> | |
31 | ||
32 | #include "trace.h" | |
33 | #include "trace_output.h" | |
34 | ||
a82378d8 | 35 | #define MAX_TRACE_ARGS 128 |
413d37d1 | 36 | #define MAX_ARGSTR_LEN 63 |
4263565d | 37 | #define MAX_EVENT_NAME_LEN 64 |
413d37d1 MH |
38 | |
39 | /* currently, trace_kprobe only supports X86. */ | |
40 | ||
41 | struct fetch_func { | |
42 | unsigned long (*func)(struct pt_regs *, void *); | |
43 | void *data; | |
44 | }; | |
45 | ||
46 | static __kprobes unsigned long call_fetch(struct fetch_func *f, | |
47 | struct pt_regs *regs) | |
48 | { | |
49 | return f->func(regs, f->data); | |
50 | } | |
51 | ||
52 | /* fetch handlers */ | |
53 | static __kprobes unsigned long fetch_register(struct pt_regs *regs, | |
54 | void *offset) | |
55 | { | |
56 | return regs_get_register(regs, (unsigned int)((unsigned long)offset)); | |
57 | } | |
58 | ||
59 | static __kprobes unsigned long fetch_stack(struct pt_regs *regs, | |
60 | void *num) | |
61 | { | |
62 | return regs_get_kernel_stack_nth(regs, | |
63 | (unsigned int)((unsigned long)num)); | |
64 | } | |
65 | ||
66 | static __kprobes unsigned long fetch_memory(struct pt_regs *regs, void *addr) | |
67 | { | |
68 | unsigned long retval; | |
69 | ||
70 | if (probe_kernel_address(addr, retval)) | |
71 | return 0; | |
72 | return retval; | |
73 | } | |
74 | ||
75 | static __kprobes unsigned long fetch_argument(struct pt_regs *regs, void *num) | |
76 | { | |
77 | return regs_get_argument_nth(regs, (unsigned int)((unsigned long)num)); | |
78 | } | |
79 | ||
80 | static __kprobes unsigned long fetch_retvalue(struct pt_regs *regs, | |
81 | void *dummy) | |
82 | { | |
83 | return regs_return_value(regs); | |
84 | } | |
85 | ||
86 | static __kprobes unsigned long fetch_ip(struct pt_regs *regs, void *dummy) | |
87 | { | |
88 | return instruction_pointer(regs); | |
89 | } | |
90 | ||
91 | static __kprobes unsigned long fetch_stack_address(struct pt_regs *regs, | |
92 | void *dummy) | |
93 | { | |
94 | return kernel_stack_pointer(regs); | |
95 | } | |
96 | ||
97 | /* Memory fetching by symbol */ | |
98 | struct symbol_cache { | |
99 | char *symbol; | |
100 | long offset; | |
101 | unsigned long addr; | |
102 | }; | |
103 | ||
104 | static unsigned long update_symbol_cache(struct symbol_cache *sc) | |
105 | { | |
106 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); | |
107 | if (sc->addr) | |
108 | sc->addr += sc->offset; | |
109 | return sc->addr; | |
110 | } | |
111 | ||
112 | static void free_symbol_cache(struct symbol_cache *sc) | |
113 | { | |
114 | kfree(sc->symbol); | |
115 | kfree(sc); | |
116 | } | |
117 | ||
118 | static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) | |
119 | { | |
120 | struct symbol_cache *sc; | |
121 | ||
122 | if (!sym || strlen(sym) == 0) | |
123 | return NULL; | |
124 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); | |
125 | if (!sc) | |
126 | return NULL; | |
127 | ||
128 | sc->symbol = kstrdup(sym, GFP_KERNEL); | |
129 | if (!sc->symbol) { | |
130 | kfree(sc); | |
131 | return NULL; | |
132 | } | |
133 | sc->offset = offset; | |
134 | ||
135 | update_symbol_cache(sc); | |
136 | return sc; | |
137 | } | |
138 | ||
139 | static __kprobes unsigned long fetch_symbol(struct pt_regs *regs, void *data) | |
140 | { | |
141 | struct symbol_cache *sc = data; | |
142 | ||
143 | if (sc->addr) | |
144 | return fetch_memory(regs, (void *)sc->addr); | |
145 | else | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* Special indirect memory access interface */ | |
150 | struct indirect_fetch_data { | |
151 | struct fetch_func orig; | |
152 | long offset; | |
153 | }; | |
154 | ||
155 | static __kprobes unsigned long fetch_indirect(struct pt_regs *regs, void *data) | |
156 | { | |
157 | struct indirect_fetch_data *ind = data; | |
158 | unsigned long addr; | |
159 | ||
160 | addr = call_fetch(&ind->orig, regs); | |
161 | if (addr) { | |
162 | addr += ind->offset; | |
163 | return fetch_memory(regs, (void *)addr); | |
164 | } else | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static __kprobes void free_indirect_fetch_data(struct indirect_fetch_data *data) | |
169 | { | |
170 | if (data->orig.func == fetch_indirect) | |
171 | free_indirect_fetch_data(data->orig.data); | |
172 | else if (data->orig.func == fetch_symbol) | |
173 | free_symbol_cache(data->orig.data); | |
174 | kfree(data); | |
175 | } | |
176 | ||
177 | /** | |
178 | * kprobe_trace_core | |
179 | */ | |
180 | ||
181 | struct trace_probe { | |
182 | struct list_head list; | |
183 | union { | |
184 | struct kprobe kp; | |
185 | struct kretprobe rp; | |
186 | }; | |
187 | const char *symbol; /* symbol name */ | |
413d37d1 | 188 | struct ftrace_event_call call; |
a82378d8 MH |
189 | unsigned int nr_args; |
190 | struct fetch_func args[]; | |
413d37d1 MH |
191 | }; |
192 | ||
a82378d8 MH |
193 | #define SIZEOF_TRACE_PROBE(n) \ |
194 | (offsetof(struct trace_probe, args) + \ | |
195 | (sizeof(struct fetch_func) * (n))) | |
196 | ||
413d37d1 MH |
197 | static int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs); |
198 | static int kretprobe_trace_func(struct kretprobe_instance *ri, | |
199 | struct pt_regs *regs); | |
200 | ||
201 | static __kprobes int probe_is_return(struct trace_probe *tp) | |
202 | { | |
203 | return (tp->rp.handler == kretprobe_trace_func); | |
204 | } | |
205 | ||
206 | static __kprobes const char *probe_symbol(struct trace_probe *tp) | |
207 | { | |
208 | return tp->symbol ? tp->symbol : "unknown"; | |
209 | } | |
210 | ||
211 | static __kprobes long probe_offset(struct trace_probe *tp) | |
212 | { | |
213 | return (probe_is_return(tp)) ? tp->rp.kp.offset : tp->kp.offset; | |
214 | } | |
215 | ||
216 | static __kprobes void *probe_address(struct trace_probe *tp) | |
217 | { | |
218 | return (probe_is_return(tp)) ? tp->rp.kp.addr : tp->kp.addr; | |
219 | } | |
220 | ||
221 | static int trace_arg_string(char *buf, size_t n, struct fetch_func *ff) | |
222 | { | |
223 | int ret = -EINVAL; | |
224 | ||
225 | if (ff->func == fetch_argument) | |
226 | ret = snprintf(buf, n, "a%lu", (unsigned long)ff->data); | |
227 | else if (ff->func == fetch_register) { | |
228 | const char *name; | |
229 | name = regs_query_register_name((unsigned int)((long)ff->data)); | |
230 | ret = snprintf(buf, n, "%%%s", name); | |
231 | } else if (ff->func == fetch_stack) | |
232 | ret = snprintf(buf, n, "s%lu", (unsigned long)ff->data); | |
233 | else if (ff->func == fetch_memory) | |
234 | ret = snprintf(buf, n, "@0x%p", ff->data); | |
235 | else if (ff->func == fetch_symbol) { | |
236 | struct symbol_cache *sc = ff->data; | |
237 | ret = snprintf(buf, n, "@%s%+ld", sc->symbol, sc->offset); | |
238 | } else if (ff->func == fetch_retvalue) | |
239 | ret = snprintf(buf, n, "rv"); | |
240 | else if (ff->func == fetch_ip) | |
241 | ret = snprintf(buf, n, "ra"); | |
242 | else if (ff->func == fetch_stack_address) | |
243 | ret = snprintf(buf, n, "sa"); | |
244 | else if (ff->func == fetch_indirect) { | |
245 | struct indirect_fetch_data *id = ff->data; | |
246 | size_t l = 0; | |
247 | ret = snprintf(buf, n, "%+ld(", id->offset); | |
248 | if (ret >= n) | |
249 | goto end; | |
250 | l += ret; | |
251 | ret = trace_arg_string(buf + l, n - l, &id->orig); | |
252 | if (ret < 0) | |
253 | goto end; | |
254 | l += ret; | |
255 | ret = snprintf(buf + l, n - l, ")"); | |
256 | ret += l; | |
257 | } | |
258 | end: | |
259 | if (ret >= n) | |
260 | return -ENOSPC; | |
261 | return ret; | |
262 | } | |
263 | ||
264 | static int register_probe_event(struct trace_probe *tp); | |
265 | static void unregister_probe_event(struct trace_probe *tp); | |
266 | ||
267 | static DEFINE_MUTEX(probe_lock); | |
268 | static LIST_HEAD(probe_list); | |
269 | ||
270 | static struct trace_probe *alloc_trace_probe(const char *symbol, | |
a82378d8 | 271 | const char *event, int nargs) |
413d37d1 MH |
272 | { |
273 | struct trace_probe *tp; | |
274 | ||
a82378d8 | 275 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
413d37d1 MH |
276 | if (!tp) |
277 | return ERR_PTR(-ENOMEM); | |
278 | ||
279 | if (symbol) { | |
280 | tp->symbol = kstrdup(symbol, GFP_KERNEL); | |
281 | if (!tp->symbol) | |
282 | goto error; | |
283 | } | |
4263565d MH |
284 | if (!event) |
285 | goto error; | |
286 | tp->call.name = kstrdup(event, GFP_KERNEL); | |
287 | if (!tp->call.name) | |
288 | goto error; | |
413d37d1 MH |
289 | |
290 | INIT_LIST_HEAD(&tp->list); | |
291 | return tp; | |
292 | error: | |
293 | kfree(tp->symbol); | |
294 | kfree(tp); | |
295 | return ERR_PTR(-ENOMEM); | |
296 | } | |
297 | ||
298 | static void free_trace_probe(struct trace_probe *tp) | |
299 | { | |
300 | int i; | |
301 | ||
302 | for (i = 0; i < tp->nr_args; i++) | |
303 | if (tp->args[i].func == fetch_symbol) | |
304 | free_symbol_cache(tp->args[i].data); | |
305 | else if (tp->args[i].func == fetch_indirect) | |
306 | free_indirect_fetch_data(tp->args[i].data); | |
307 | ||
308 | kfree(tp->call.name); | |
309 | kfree(tp->symbol); | |
310 | kfree(tp); | |
311 | } | |
312 | ||
313 | static struct trace_probe *find_probe_event(const char *event) | |
314 | { | |
315 | struct trace_probe *tp; | |
316 | ||
317 | list_for_each_entry(tp, &probe_list, list) | |
4263565d | 318 | if (!strcmp(tp->call.name, event)) |
413d37d1 MH |
319 | return tp; |
320 | return NULL; | |
321 | } | |
322 | ||
323 | static void __unregister_trace_probe(struct trace_probe *tp) | |
324 | { | |
325 | if (probe_is_return(tp)) | |
326 | unregister_kretprobe(&tp->rp); | |
327 | else | |
328 | unregister_kprobe(&tp->kp); | |
329 | } | |
330 | ||
331 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ | |
332 | static void unregister_trace_probe(struct trace_probe *tp) | |
333 | { | |
4263565d | 334 | unregister_probe_event(tp); |
413d37d1 MH |
335 | __unregister_trace_probe(tp); |
336 | list_del(&tp->list); | |
337 | } | |
338 | ||
339 | /* Register a trace_probe and probe_event */ | |
340 | static int register_trace_probe(struct trace_probe *tp) | |
341 | { | |
342 | struct trace_probe *old_tp; | |
343 | int ret; | |
344 | ||
345 | mutex_lock(&probe_lock); | |
346 | ||
347 | if (probe_is_return(tp)) | |
348 | ret = register_kretprobe(&tp->rp); | |
349 | else | |
350 | ret = register_kprobe(&tp->kp); | |
351 | ||
352 | if (ret) { | |
353 | pr_warning("Could not insert probe(%d)\n", ret); | |
354 | if (ret == -EILSEQ) { | |
355 | pr_warning("Probing address(0x%p) is not an " | |
356 | "instruction boundary.\n", | |
357 | probe_address(tp)); | |
358 | ret = -EINVAL; | |
359 | } | |
360 | goto end; | |
361 | } | |
362 | /* register as an event */ | |
4263565d MH |
363 | old_tp = find_probe_event(tp->call.name); |
364 | if (old_tp) { | |
365 | /* delete old event */ | |
366 | unregister_trace_probe(old_tp); | |
367 | free_trace_probe(old_tp); | |
368 | } | |
369 | ret = register_probe_event(tp); | |
370 | if (ret) { | |
371 | pr_warning("Faild to register probe event(%d)\n", ret); | |
372 | __unregister_trace_probe(tp); | |
413d37d1 MH |
373 | } |
374 | list_add_tail(&tp->list, &probe_list); | |
375 | end: | |
376 | mutex_unlock(&probe_lock); | |
377 | return ret; | |
378 | } | |
379 | ||
380 | /* Split symbol and offset. */ | |
381 | static int split_symbol_offset(char *symbol, long *offset) | |
382 | { | |
383 | char *tmp; | |
384 | int ret; | |
385 | ||
386 | if (!offset) | |
387 | return -EINVAL; | |
388 | ||
389 | tmp = strchr(symbol, '+'); | |
390 | if (!tmp) | |
391 | tmp = strchr(symbol, '-'); | |
392 | ||
393 | if (tmp) { | |
394 | /* skip sign because strict_strtol doesn't accept '+' */ | |
395 | ret = strict_strtol(tmp + 1, 0, offset); | |
396 | if (ret) | |
397 | return ret; | |
398 | if (*tmp == '-') | |
399 | *offset = -(*offset); | |
400 | *tmp = '\0'; | |
401 | } else | |
402 | *offset = 0; | |
403 | return 0; | |
404 | } | |
405 | ||
406 | #define PARAM_MAX_ARGS 16 | |
407 | #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long)) | |
408 | ||
409 | static int parse_trace_arg(char *arg, struct fetch_func *ff, int is_return) | |
410 | { | |
411 | int ret = 0; | |
412 | unsigned long param; | |
413 | long offset; | |
414 | char *tmp; | |
415 | ||
416 | switch (arg[0]) { | |
417 | case 'a': /* argument */ | |
418 | ret = strict_strtoul(arg + 1, 10, ¶m); | |
419 | if (ret || param > PARAM_MAX_ARGS) | |
420 | ret = -EINVAL; | |
421 | else { | |
422 | ff->func = fetch_argument; | |
423 | ff->data = (void *)param; | |
424 | } | |
425 | break; | |
426 | case 'r': /* retval or retaddr */ | |
427 | if (is_return && arg[1] == 'v') { | |
428 | ff->func = fetch_retvalue; | |
429 | ff->data = NULL; | |
430 | } else if (is_return && arg[1] == 'a') { | |
431 | ff->func = fetch_ip; | |
432 | ff->data = NULL; | |
433 | } else | |
434 | ret = -EINVAL; | |
435 | break; | |
436 | case '%': /* named register */ | |
437 | ret = regs_query_register_offset(arg + 1); | |
438 | if (ret >= 0) { | |
439 | ff->func = fetch_register; | |
440 | ff->data = (void *)(unsigned long)ret; | |
441 | ret = 0; | |
442 | } | |
443 | break; | |
444 | case 's': /* stack */ | |
445 | if (arg[1] == 'a') { | |
446 | ff->func = fetch_stack_address; | |
447 | ff->data = NULL; | |
448 | } else { | |
449 | ret = strict_strtoul(arg + 1, 10, ¶m); | |
450 | if (ret || param > PARAM_MAX_STACK) | |
451 | ret = -EINVAL; | |
452 | else { | |
453 | ff->func = fetch_stack; | |
454 | ff->data = (void *)param; | |
455 | } | |
456 | } | |
457 | break; | |
458 | case '@': /* memory or symbol */ | |
459 | if (isdigit(arg[1])) { | |
460 | ret = strict_strtoul(arg + 1, 0, ¶m); | |
461 | if (ret) | |
462 | break; | |
463 | ff->func = fetch_memory; | |
464 | ff->data = (void *)param; | |
465 | } else { | |
466 | ret = split_symbol_offset(arg + 1, &offset); | |
467 | if (ret) | |
468 | break; | |
469 | ff->data = alloc_symbol_cache(arg + 1, | |
470 | offset); | |
471 | if (ff->data) | |
472 | ff->func = fetch_symbol; | |
473 | else | |
474 | ret = -EINVAL; | |
475 | } | |
476 | break; | |
477 | case '+': /* indirect memory */ | |
478 | case '-': | |
479 | tmp = strchr(arg, '('); | |
480 | if (!tmp) { | |
481 | ret = -EINVAL; | |
482 | break; | |
483 | } | |
484 | *tmp = '\0'; | |
485 | ret = strict_strtol(arg + 1, 0, &offset); | |
486 | if (ret) | |
487 | break; | |
488 | if (arg[0] == '-') | |
489 | offset = -offset; | |
490 | arg = tmp + 1; | |
491 | tmp = strrchr(arg, ')'); | |
492 | if (tmp) { | |
493 | struct indirect_fetch_data *id; | |
494 | *tmp = '\0'; | |
495 | id = kzalloc(sizeof(struct indirect_fetch_data), | |
496 | GFP_KERNEL); | |
497 | if (!id) | |
498 | return -ENOMEM; | |
499 | id->offset = offset; | |
500 | ret = parse_trace_arg(arg, &id->orig, is_return); | |
501 | if (ret) | |
502 | kfree(id); | |
503 | else { | |
504 | ff->func = fetch_indirect; | |
505 | ff->data = (void *)id; | |
506 | } | |
507 | } else | |
508 | ret = -EINVAL; | |
509 | break; | |
510 | default: | |
511 | /* TODO: support custom handler */ | |
512 | ret = -EINVAL; | |
513 | } | |
514 | return ret; | |
515 | } | |
516 | ||
517 | static int create_trace_probe(int argc, char **argv) | |
518 | { | |
519 | /* | |
520 | * Argument syntax: | |
521 | * - Add kprobe: p[:EVENT] SYMBOL[+OFFS|-OFFS]|ADDRESS [FETCHARGS] | |
522 | * - Add kretprobe: r[:EVENT] SYMBOL[+0] [FETCHARGS] | |
523 | * Fetch args: | |
524 | * aN : fetch Nth of function argument. (N:0-) | |
525 | * rv : fetch return value | |
526 | * ra : fetch return address | |
527 | * sa : fetch stack address | |
528 | * sN : fetch Nth of stack (N:0-) | |
529 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) | |
530 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) | |
531 | * %REG : fetch register REG | |
532 | * Indirect memory fetch: | |
533 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. | |
534 | */ | |
535 | struct trace_probe *tp; | |
536 | struct kprobe *kp; | |
537 | int i, ret = 0; | |
538 | int is_return = 0; | |
539 | char *symbol = NULL, *event = NULL; | |
540 | long offset = 0; | |
541 | void *addr = NULL; | |
542 | ||
543 | if (argc < 2) | |
544 | return -EINVAL; | |
545 | ||
546 | if (argv[0][0] == 'p') | |
547 | is_return = 0; | |
548 | else if (argv[0][0] == 'r') | |
549 | is_return = 1; | |
550 | else | |
551 | return -EINVAL; | |
552 | ||
553 | if (argv[0][1] == ':') { | |
554 | event = &argv[0][2]; | |
555 | if (strlen(event) == 0) { | |
556 | pr_info("Event name is not specifiled\n"); | |
557 | return -EINVAL; | |
558 | } | |
559 | } | |
560 | ||
561 | if (isdigit(argv[1][0])) { | |
562 | if (is_return) | |
563 | return -EINVAL; | |
564 | /* an address specified */ | |
565 | ret = strict_strtoul(&argv[0][2], 0, (unsigned long *)&addr); | |
566 | if (ret) | |
567 | return ret; | |
568 | } else { | |
569 | /* a symbol specified */ | |
570 | symbol = argv[1]; | |
571 | /* TODO: support .init module functions */ | |
572 | ret = split_symbol_offset(symbol, &offset); | |
573 | if (ret) | |
574 | return ret; | |
575 | if (offset && is_return) | |
576 | return -EINVAL; | |
577 | } | |
a82378d8 | 578 | argc -= 2; argv += 2; |
413d37d1 MH |
579 | |
580 | /* setup a probe */ | |
4263565d MH |
581 | if (!event) { |
582 | /* Make a new event name */ | |
583 | char buf[MAX_EVENT_NAME_LEN]; | |
584 | if (symbol) | |
585 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c@%s%+ld", | |
586 | is_return ? 'r' : 'p', symbol, offset); | |
587 | else | |
588 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c@0x%p", | |
589 | is_return ? 'r' : 'p', addr); | |
590 | tp = alloc_trace_probe(symbol, buf, argc); | |
591 | } else | |
592 | tp = alloc_trace_probe(symbol, event, argc); | |
413d37d1 MH |
593 | if (IS_ERR(tp)) |
594 | return PTR_ERR(tp); | |
595 | ||
596 | if (is_return) { | |
597 | kp = &tp->rp.kp; | |
598 | tp->rp.handler = kretprobe_trace_func; | |
599 | } else { | |
600 | kp = &tp->kp; | |
601 | tp->kp.pre_handler = kprobe_trace_func; | |
602 | } | |
603 | ||
604 | if (tp->symbol) { | |
605 | kp->symbol_name = tp->symbol; | |
606 | kp->offset = offset; | |
607 | } else | |
608 | kp->addr = addr; | |
609 | ||
610 | /* parse arguments */ | |
a82378d8 MH |
611 | ret = 0; |
612 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { | |
413d37d1 MH |
613 | if (strlen(argv[i]) > MAX_ARGSTR_LEN) { |
614 | pr_info("Argument%d(%s) is too long.\n", i, argv[i]); | |
615 | ret = -ENOSPC; | |
616 | goto error; | |
617 | } | |
618 | ret = parse_trace_arg(argv[i], &tp->args[i], is_return); | |
619 | if (ret) | |
620 | goto error; | |
621 | } | |
622 | tp->nr_args = i; | |
623 | ||
624 | ret = register_trace_probe(tp); | |
625 | if (ret) | |
626 | goto error; | |
627 | return 0; | |
628 | ||
629 | error: | |
630 | free_trace_probe(tp); | |
631 | return ret; | |
632 | } | |
633 | ||
634 | static void cleanup_all_probes(void) | |
635 | { | |
636 | struct trace_probe *tp; | |
637 | ||
638 | mutex_lock(&probe_lock); | |
639 | /* TODO: Use batch unregistration */ | |
640 | while (!list_empty(&probe_list)) { | |
641 | tp = list_entry(probe_list.next, struct trace_probe, list); | |
642 | unregister_trace_probe(tp); | |
643 | free_trace_probe(tp); | |
644 | } | |
645 | mutex_unlock(&probe_lock); | |
646 | } | |
647 | ||
648 | ||
649 | /* Probes listing interfaces */ | |
650 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) | |
651 | { | |
652 | mutex_lock(&probe_lock); | |
653 | return seq_list_start(&probe_list, *pos); | |
654 | } | |
655 | ||
656 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
657 | { | |
658 | return seq_list_next(v, &probe_list, pos); | |
659 | } | |
660 | ||
661 | static void probes_seq_stop(struct seq_file *m, void *v) | |
662 | { | |
663 | mutex_unlock(&probe_lock); | |
664 | } | |
665 | ||
666 | static int probes_seq_show(struct seq_file *m, void *v) | |
667 | { | |
668 | struct trace_probe *tp = v; | |
669 | int i, ret; | |
670 | char buf[MAX_ARGSTR_LEN + 1]; | |
671 | ||
672 | seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p'); | |
4263565d | 673 | seq_printf(m, ":%s", tp->call.name); |
413d37d1 MH |
674 | |
675 | if (tp->symbol) | |
676 | seq_printf(m, " %s%+ld", probe_symbol(tp), probe_offset(tp)); | |
677 | else | |
678 | seq_printf(m, " 0x%p", probe_address(tp)); | |
679 | ||
680 | for (i = 0; i < tp->nr_args; i++) { | |
681 | ret = trace_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]); | |
682 | if (ret < 0) { | |
683 | pr_warning("Argument%d decoding error(%d).\n", i, ret); | |
684 | return ret; | |
685 | } | |
686 | seq_printf(m, " %s", buf); | |
687 | } | |
688 | seq_printf(m, "\n"); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static const struct seq_operations probes_seq_op = { | |
693 | .start = probes_seq_start, | |
694 | .next = probes_seq_next, | |
695 | .stop = probes_seq_stop, | |
696 | .show = probes_seq_show | |
697 | }; | |
698 | ||
699 | static int probes_open(struct inode *inode, struct file *file) | |
700 | { | |
701 | if ((file->f_mode & FMODE_WRITE) && | |
702 | (file->f_flags & O_TRUNC)) | |
703 | cleanup_all_probes(); | |
704 | ||
705 | return seq_open(file, &probes_seq_op); | |
706 | } | |
707 | ||
708 | static int command_trace_probe(const char *buf) | |
709 | { | |
710 | char **argv; | |
711 | int argc = 0, ret = 0; | |
712 | ||
713 | argv = argv_split(GFP_KERNEL, buf, &argc); | |
714 | if (!argv) | |
715 | return -ENOMEM; | |
716 | ||
717 | if (argc) | |
718 | ret = create_trace_probe(argc, argv); | |
719 | ||
720 | argv_free(argv); | |
721 | return ret; | |
722 | } | |
723 | ||
724 | #define WRITE_BUFSIZE 128 | |
725 | ||
726 | static ssize_t probes_write(struct file *file, const char __user *buffer, | |
727 | size_t count, loff_t *ppos) | |
728 | { | |
729 | char *kbuf, *tmp; | |
730 | int ret; | |
731 | size_t done; | |
732 | size_t size; | |
733 | ||
734 | kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); | |
735 | if (!kbuf) | |
736 | return -ENOMEM; | |
737 | ||
738 | ret = done = 0; | |
739 | while (done < count) { | |
740 | size = count - done; | |
741 | if (size >= WRITE_BUFSIZE) | |
742 | size = WRITE_BUFSIZE - 1; | |
743 | if (copy_from_user(kbuf, buffer + done, size)) { | |
744 | ret = -EFAULT; | |
745 | goto out; | |
746 | } | |
747 | kbuf[size] = '\0'; | |
748 | tmp = strchr(kbuf, '\n'); | |
749 | if (tmp) { | |
750 | *tmp = '\0'; | |
751 | size = tmp - kbuf + 1; | |
752 | } else if (done + size < count) { | |
753 | pr_warning("Line length is too long: " | |
754 | "Should be less than %d.", WRITE_BUFSIZE); | |
755 | ret = -EINVAL; | |
756 | goto out; | |
757 | } | |
758 | done += size; | |
759 | /* Remove comments */ | |
760 | tmp = strchr(kbuf, '#'); | |
761 | if (tmp) | |
762 | *tmp = '\0'; | |
763 | ||
764 | ret = command_trace_probe(kbuf); | |
765 | if (ret) | |
766 | goto out; | |
767 | } | |
768 | ret = done; | |
769 | out: | |
770 | kfree(kbuf); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | static const struct file_operations kprobe_events_ops = { | |
775 | .owner = THIS_MODULE, | |
776 | .open = probes_open, | |
777 | .read = seq_read, | |
778 | .llseek = seq_lseek, | |
779 | .release = seq_release, | |
780 | .write = probes_write, | |
781 | }; | |
782 | ||
783 | /* Kprobe handler */ | |
784 | static __kprobes int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs) | |
785 | { | |
786 | struct trace_probe *tp = container_of(kp, struct trace_probe, kp); | |
787 | struct kprobe_trace_entry *entry; | |
788 | struct ring_buffer_event *event; | |
789 | int size, i, pc; | |
790 | unsigned long irq_flags; | |
4263565d | 791 | struct ftrace_event_call *call = &tp->call; |
413d37d1 MH |
792 | |
793 | local_save_flags(irq_flags); | |
794 | pc = preempt_count(); | |
795 | ||
796 | size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args); | |
797 | ||
798 | event = trace_current_buffer_lock_reserve(TRACE_KPROBE, size, | |
799 | irq_flags, pc); | |
800 | if (!event) | |
801 | return 0; | |
802 | ||
803 | entry = ring_buffer_event_data(event); | |
804 | entry->nargs = tp->nr_args; | |
805 | entry->ip = (unsigned long)kp->addr; | |
806 | for (i = 0; i < tp->nr_args; i++) | |
807 | entry->args[i] = call_fetch(&tp->args[i], regs); | |
808 | ||
809 | if (!filter_current_check_discard(call, entry, event)) | |
810 | trace_nowake_buffer_unlock_commit(event, irq_flags, pc); | |
811 | return 0; | |
812 | } | |
813 | ||
814 | /* Kretprobe handler */ | |
815 | static __kprobes int kretprobe_trace_func(struct kretprobe_instance *ri, | |
816 | struct pt_regs *regs) | |
817 | { | |
818 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); | |
819 | struct kretprobe_trace_entry *entry; | |
820 | struct ring_buffer_event *event; | |
821 | int size, i, pc; | |
822 | unsigned long irq_flags; | |
4263565d | 823 | struct ftrace_event_call *call = &tp->call; |
413d37d1 MH |
824 | |
825 | local_save_flags(irq_flags); | |
826 | pc = preempt_count(); | |
827 | ||
828 | size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args); | |
829 | ||
830 | event = trace_current_buffer_lock_reserve(TRACE_KRETPROBE, size, | |
831 | irq_flags, pc); | |
832 | if (!event) | |
833 | return 0; | |
834 | ||
835 | entry = ring_buffer_event_data(event); | |
836 | entry->nargs = tp->nr_args; | |
837 | entry->func = (unsigned long)probe_address(tp); | |
838 | entry->ret_ip = (unsigned long)ri->ret_addr; | |
839 | for (i = 0; i < tp->nr_args; i++) | |
840 | entry->args[i] = call_fetch(&tp->args[i], regs); | |
841 | ||
842 | if (!filter_current_check_discard(call, entry, event)) | |
843 | trace_nowake_buffer_unlock_commit(event, irq_flags, pc); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | /* Event entry printers */ | |
849 | enum print_line_t | |
850 | print_kprobe_event(struct trace_iterator *iter, int flags) | |
851 | { | |
852 | struct kprobe_trace_entry *field; | |
853 | struct trace_seq *s = &iter->seq; | |
854 | int i; | |
855 | ||
856 | trace_assign_type(field, iter->ent); | |
857 | ||
858 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) | |
859 | goto partial; | |
860 | ||
861 | if (!trace_seq_puts(s, ":")) | |
862 | goto partial; | |
863 | ||
864 | for (i = 0; i < field->nargs; i++) | |
865 | if (!trace_seq_printf(s, " 0x%lx", field->args[i])) | |
866 | goto partial; | |
867 | ||
868 | if (!trace_seq_puts(s, "\n")) | |
869 | goto partial; | |
870 | ||
871 | return TRACE_TYPE_HANDLED; | |
872 | partial: | |
873 | return TRACE_TYPE_PARTIAL_LINE; | |
874 | } | |
875 | ||
876 | enum print_line_t | |
877 | print_kretprobe_event(struct trace_iterator *iter, int flags) | |
878 | { | |
879 | struct kretprobe_trace_entry *field; | |
880 | struct trace_seq *s = &iter->seq; | |
881 | int i; | |
882 | ||
883 | trace_assign_type(field, iter->ent); | |
884 | ||
885 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) | |
886 | goto partial; | |
887 | ||
888 | if (!trace_seq_puts(s, " <- ")) | |
889 | goto partial; | |
890 | ||
891 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) | |
892 | goto partial; | |
893 | ||
894 | if (!trace_seq_puts(s, ":")) | |
895 | goto partial; | |
896 | ||
897 | for (i = 0; i < field->nargs; i++) | |
898 | if (!trace_seq_printf(s, " 0x%lx", field->args[i])) | |
899 | goto partial; | |
900 | ||
901 | if (!trace_seq_puts(s, "\n")) | |
902 | goto partial; | |
903 | ||
904 | return TRACE_TYPE_HANDLED; | |
905 | partial: | |
906 | return TRACE_TYPE_PARTIAL_LINE; | |
907 | } | |
908 | ||
909 | static struct trace_event kprobe_trace_event = { | |
910 | .type = TRACE_KPROBE, | |
911 | .trace = print_kprobe_event, | |
912 | }; | |
913 | ||
914 | static struct trace_event kretprobe_trace_event = { | |
915 | .type = TRACE_KRETPROBE, | |
916 | .trace = print_kretprobe_event, | |
917 | }; | |
918 | ||
919 | static int probe_event_enable(struct ftrace_event_call *call) | |
920 | { | |
921 | struct trace_probe *tp = (struct trace_probe *)call->data; | |
922 | ||
923 | if (probe_is_return(tp)) | |
924 | return enable_kretprobe(&tp->rp); | |
925 | else | |
926 | return enable_kprobe(&tp->kp); | |
927 | } | |
928 | ||
929 | static void probe_event_disable(struct ftrace_event_call *call) | |
930 | { | |
931 | struct trace_probe *tp = (struct trace_probe *)call->data; | |
932 | ||
933 | if (probe_is_return(tp)) | |
934 | disable_kretprobe(&tp->rp); | |
935 | else | |
936 | disable_kprobe(&tp->kp); | |
937 | } | |
938 | ||
939 | static int probe_event_raw_init(struct ftrace_event_call *event_call) | |
940 | { | |
941 | INIT_LIST_HEAD(&event_call->fields); | |
942 | init_preds(event_call); | |
943 | return 0; | |
944 | } | |
945 | ||
946 | #undef DEFINE_FIELD | |
947 | #define DEFINE_FIELD(type, item, name, is_signed) \ | |
948 | do { \ | |
949 | ret = trace_define_field(event_call, #type, name, \ | |
950 | offsetof(typeof(field), item), \ | |
951 | sizeof(field.item), is_signed, \ | |
952 | FILTER_OTHER); \ | |
953 | if (ret) \ | |
954 | return ret; \ | |
955 | } while (0) | |
956 | ||
957 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) | |
958 | { | |
959 | int ret, i; | |
960 | struct kprobe_trace_entry field; | |
961 | char buf[MAX_ARGSTR_LEN + 1]; | |
962 | struct trace_probe *tp = (struct trace_probe *)event_call->data; | |
963 | ||
964 | ret = trace_define_common_fields(event_call); | |
965 | if (!ret) | |
966 | return ret; | |
967 | ||
968 | DEFINE_FIELD(unsigned long, ip, "ip", 0); | |
969 | DEFINE_FIELD(int, nargs, "nargs", 1); | |
970 | for (i = 0; i < tp->nr_args; i++) { | |
971 | /* Set argN as a field */ | |
972 | sprintf(buf, "arg%d", i); | |
973 | DEFINE_FIELD(unsigned long, args[i], buf, 0); | |
974 | /* Set argument string as an alias field */ | |
975 | ret = trace_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]); | |
976 | if (ret < 0) | |
977 | return ret; | |
978 | DEFINE_FIELD(unsigned long, args[i], buf, 0); | |
979 | } | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) | |
984 | { | |
985 | int ret, i; | |
986 | struct kretprobe_trace_entry field; | |
987 | char buf[MAX_ARGSTR_LEN + 1]; | |
988 | struct trace_probe *tp = (struct trace_probe *)event_call->data; | |
989 | ||
990 | ret = trace_define_common_fields(event_call); | |
991 | if (!ret) | |
992 | return ret; | |
993 | ||
994 | DEFINE_FIELD(unsigned long, func, "func", 0); | |
995 | DEFINE_FIELD(unsigned long, ret_ip, "ret_ip", 0); | |
996 | DEFINE_FIELD(int, nargs, "nargs", 1); | |
997 | for (i = 0; i < tp->nr_args; i++) { | |
998 | /* Set argN as a field */ | |
999 | sprintf(buf, "arg%d", i); | |
1000 | DEFINE_FIELD(unsigned long, args[i], buf, 0); | |
1001 | /* Set argument string as an alias field */ | |
1002 | ret = trace_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]); | |
1003 | if (ret < 0) | |
1004 | return ret; | |
1005 | DEFINE_FIELD(unsigned long, args[i], buf, 0); | |
1006 | } | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static int __probe_event_show_format(struct trace_seq *s, | |
1011 | struct trace_probe *tp, const char *fmt, | |
1012 | const char *arg) | |
1013 | { | |
1014 | int i, ret; | |
1015 | char buf[MAX_ARGSTR_LEN + 1]; | |
1016 | ||
1017 | /* Show aliases */ | |
1018 | for (i = 0; i < tp->nr_args; i++) { | |
1019 | ret = trace_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]); | |
1020 | if (ret < 0) | |
1021 | return ret; | |
1022 | if (!trace_seq_printf(s, "\talias: %s;\toriginal: arg%d;\n", | |
1023 | buf, i)) | |
1024 | return 0; | |
1025 | } | |
1026 | /* Show format */ | |
1027 | if (!trace_seq_printf(s, "\nprint fmt: \"%s", fmt)) | |
1028 | return 0; | |
1029 | ||
1030 | for (i = 0; i < tp->nr_args; i++) | |
1031 | if (!trace_seq_puts(s, " 0x%lx")) | |
1032 | return 0; | |
1033 | ||
1034 | if (!trace_seq_printf(s, "\", %s", arg)) | |
1035 | return 0; | |
1036 | ||
1037 | for (i = 0; i < tp->nr_args; i++) | |
1038 | if (!trace_seq_printf(s, ", arg%d", i)) | |
1039 | return 0; | |
1040 | ||
1041 | return trace_seq_puts(s, "\n"); | |
1042 | } | |
1043 | ||
1044 | #undef SHOW_FIELD | |
1045 | #define SHOW_FIELD(type, item, name) \ | |
1046 | do { \ | |
1047 | ret = trace_seq_printf(s, "\tfield: " #type " %s;\t" \ | |
1048 | "offset:%u;tsize:%u;\n", name, \ | |
1049 | (unsigned int)offsetof(typeof(field), item),\ | |
1050 | (unsigned int)sizeof(type)); \ | |
1051 | if (!ret) \ | |
1052 | return 0; \ | |
1053 | } while (0) | |
1054 | ||
1055 | static int kprobe_event_show_format(struct ftrace_event_call *call, | |
1056 | struct trace_seq *s) | |
1057 | { | |
1058 | struct kprobe_trace_entry field __attribute__((unused)); | |
1059 | int ret, i; | |
1060 | char buf[8]; | |
1061 | struct trace_probe *tp = (struct trace_probe *)call->data; | |
1062 | ||
1063 | SHOW_FIELD(unsigned long, ip, "ip"); | |
1064 | SHOW_FIELD(int, nargs, "nargs"); | |
1065 | ||
1066 | /* Show fields */ | |
1067 | for (i = 0; i < tp->nr_args; i++) { | |
1068 | sprintf(buf, "arg%d", i); | |
1069 | SHOW_FIELD(unsigned long, args[i], buf); | |
1070 | } | |
1071 | trace_seq_puts(s, "\n"); | |
1072 | ||
1073 | return __probe_event_show_format(s, tp, "%lx:", "ip"); | |
1074 | } | |
1075 | ||
1076 | static int kretprobe_event_show_format(struct ftrace_event_call *call, | |
1077 | struct trace_seq *s) | |
1078 | { | |
1079 | struct kretprobe_trace_entry field __attribute__((unused)); | |
1080 | int ret, i; | |
1081 | char buf[8]; | |
1082 | struct trace_probe *tp = (struct trace_probe *)call->data; | |
1083 | ||
1084 | SHOW_FIELD(unsigned long, func, "func"); | |
1085 | SHOW_FIELD(unsigned long, ret_ip, "ret_ip"); | |
1086 | SHOW_FIELD(int, nargs, "nargs"); | |
1087 | ||
1088 | /* Show fields */ | |
1089 | for (i = 0; i < tp->nr_args; i++) { | |
1090 | sprintf(buf, "arg%d", i); | |
1091 | SHOW_FIELD(unsigned long, args[i], buf); | |
1092 | } | |
1093 | trace_seq_puts(s, "\n"); | |
1094 | ||
1095 | return __probe_event_show_format(s, tp, "%lx <- %lx:", | |
1096 | "func, ret_ip"); | |
1097 | } | |
1098 | ||
1099 | static int register_probe_event(struct trace_probe *tp) | |
1100 | { | |
1101 | struct ftrace_event_call *call = &tp->call; | |
1102 | int ret; | |
1103 | ||
1104 | /* Initialize ftrace_event_call */ | |
1105 | call->system = "kprobes"; | |
1106 | if (probe_is_return(tp)) { | |
1107 | call->event = &kretprobe_trace_event; | |
1108 | call->id = TRACE_KRETPROBE; | |
1109 | call->raw_init = probe_event_raw_init; | |
1110 | call->show_format = kretprobe_event_show_format; | |
1111 | call->define_fields = kretprobe_event_define_fields; | |
1112 | } else { | |
1113 | call->event = &kprobe_trace_event; | |
1114 | call->id = TRACE_KPROBE; | |
1115 | call->raw_init = probe_event_raw_init; | |
1116 | call->show_format = kprobe_event_show_format; | |
1117 | call->define_fields = kprobe_event_define_fields; | |
1118 | } | |
1119 | call->enabled = 1; | |
1120 | call->regfunc = probe_event_enable; | |
1121 | call->unregfunc = probe_event_disable; | |
1122 | call->data = tp; | |
1123 | ret = trace_add_event_call(call); | |
1124 | if (ret) | |
1125 | pr_info("Failed to register kprobe event: %s\n", call->name); | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | static void unregister_probe_event(struct trace_probe *tp) | |
1130 | { | |
1131 | /* | |
1132 | * Prevent to unregister event itself because the event is shared | |
1133 | * among other probes. | |
1134 | */ | |
1135 | tp->call.event = NULL; | |
1136 | trace_remove_event_call(&tp->call); | |
1137 | } | |
1138 | ||
1139 | /* Make a debugfs interface for controling probe points */ | |
1140 | static __init int init_kprobe_trace(void) | |
1141 | { | |
1142 | struct dentry *d_tracer; | |
1143 | struct dentry *entry; | |
1144 | int ret; | |
1145 | ||
1146 | ret = register_ftrace_event(&kprobe_trace_event); | |
1147 | if (!ret) { | |
1148 | pr_warning("Could not register kprobe_trace_event type.\n"); | |
1149 | return 0; | |
1150 | } | |
1151 | ret = register_ftrace_event(&kretprobe_trace_event); | |
1152 | if (!ret) { | |
1153 | pr_warning("Could not register kretprobe_trace_event type.\n"); | |
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | d_tracer = tracing_init_dentry(); | |
1158 | if (!d_tracer) | |
1159 | return 0; | |
1160 | ||
1161 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, | |
1162 | NULL, &kprobe_events_ops); | |
1163 | ||
1164 | if (!entry) | |
1165 | pr_warning("Could not create debugfs " | |
1166 | "'kprobe_events' entry\n"); | |
1167 | return 0; | |
1168 | } | |
1169 | fs_initcall(init_kprobe_trace); | |
1170 | ||
1171 | ||
1172 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1173 | ||
1174 | static int kprobe_trace_selftest_target(int a1, int a2, int a3, | |
1175 | int a4, int a5, int a6) | |
1176 | { | |
1177 | return a1 + a2 + a3 + a4 + a5 + a6; | |
1178 | } | |
1179 | ||
1180 | static __init int kprobe_trace_self_tests_init(void) | |
1181 | { | |
1182 | int ret; | |
1183 | int (*target)(int, int, int, int, int, int); | |
1184 | ||
1185 | target = kprobe_trace_selftest_target; | |
1186 | ||
1187 | pr_info("Testing kprobe tracing: "); | |
1188 | ||
1189 | ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target " | |
1190 | "a1 a2 a3 a4 a5 a6"); | |
1191 | if (WARN_ON_ONCE(ret)) | |
1192 | pr_warning("error enabling function entry\n"); | |
1193 | ||
1194 | ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target " | |
1195 | "ra rv"); | |
1196 | if (WARN_ON_ONCE(ret)) | |
1197 | pr_warning("error enabling function return\n"); | |
1198 | ||
1199 | ret = target(1, 2, 3, 4, 5, 6); | |
1200 | ||
1201 | cleanup_all_probes(); | |
1202 | ||
1203 | pr_cont("OK\n"); | |
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | late_initcall(kprobe_trace_self_tests_init); | |
1208 | ||
1209 | #endif |