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Commit | Line | Data |
---|---|---|
413d37d1 | 1 | /* |
77b44d1b | 2 | * Kprobes-based tracing events |
413d37d1 MH |
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> | |
413d37d1 | 22 | |
8ab83f56 | 23 | #include "trace_probe.h" |
1ff511e3 | 24 | |
8ab83f56 | 25 | #define KPROBE_EVENT_SYSTEM "kprobes" |
e09c8614 | 26 | |
413d37d1 | 27 | /** |
77b44d1b | 28 | * Kprobe event core functions |
413d37d1 | 29 | */ |
c31ffb3f | 30 | struct trace_kprobe { |
413d37d1 | 31 | struct list_head list; |
4a846b44 | 32 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
cd7e7bd5 | 33 | unsigned long nhit; |
413d37d1 | 34 | const char *symbol; /* symbol name */ |
c31ffb3f | 35 | struct trace_probe tp; |
413d37d1 MH |
36 | }; |
37 | ||
c31ffb3f NK |
38 | #define SIZEOF_TRACE_KPROBE(n) \ |
39 | (offsetof(struct trace_kprobe, tp.args) + \ | |
eca0d916 | 40 | (sizeof(struct probe_arg) * (n))) |
a82378d8 | 41 | |
93ccae7a | 42 | |
c31ffb3f | 43 | static __kprobes bool trace_kprobe_is_return(struct trace_kprobe *tk) |
413d37d1 | 44 | { |
c31ffb3f | 45 | return tk->rp.handler != NULL; |
413d37d1 MH |
46 | } |
47 | ||
c31ffb3f | 48 | static __kprobes const char *trace_kprobe_symbol(struct trace_kprobe *tk) |
413d37d1 | 49 | { |
c31ffb3f | 50 | return tk->symbol ? tk->symbol : "unknown"; |
413d37d1 MH |
51 | } |
52 | ||
c31ffb3f | 53 | static __kprobes unsigned long trace_kprobe_offset(struct trace_kprobe *tk) |
61424318 | 54 | { |
c31ffb3f | 55 | return tk->rp.kp.offset; |
61424318 MH |
56 | } |
57 | ||
c31ffb3f | 58 | static __kprobes bool trace_kprobe_has_gone(struct trace_kprobe *tk) |
61424318 | 59 | { |
c31ffb3f | 60 | return !!(kprobe_gone(&tk->rp.kp)); |
61424318 MH |
61 | } |
62 | ||
c31ffb3f NK |
63 | static __kprobes bool trace_kprobe_within_module(struct trace_kprobe *tk, |
64 | struct module *mod) | |
61424318 MH |
65 | { |
66 | int len = strlen(mod->name); | |
c31ffb3f | 67 | const char *name = trace_kprobe_symbol(tk); |
61424318 MH |
68 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
69 | } | |
70 | ||
c31ffb3f | 71 | static __kprobes bool trace_kprobe_is_on_module(struct trace_kprobe *tk) |
61424318 | 72 | { |
c31ffb3f | 73 | return !!strchr(trace_kprobe_symbol(tk), ':'); |
61424318 MH |
74 | } |
75 | ||
c31ffb3f NK |
76 | static int register_kprobe_event(struct trace_kprobe *tk); |
77 | static int unregister_kprobe_event(struct trace_kprobe *tk); | |
413d37d1 MH |
78 | |
79 | static DEFINE_MUTEX(probe_lock); | |
80 | static LIST_HEAD(probe_list); | |
81 | ||
50d78056 MH |
82 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
83 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, | |
84 | struct pt_regs *regs); | |
85 | ||
1301a44e NK |
86 | /* Memory fetching by symbol */ |
87 | struct symbol_cache { | |
88 | char *symbol; | |
89 | long offset; | |
90 | unsigned long addr; | |
91 | }; | |
92 | ||
93 | unsigned long update_symbol_cache(struct symbol_cache *sc) | |
94 | { | |
95 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); | |
96 | ||
97 | if (sc->addr) | |
98 | sc->addr += sc->offset; | |
99 | ||
100 | return sc->addr; | |
101 | } | |
102 | ||
103 | void free_symbol_cache(struct symbol_cache *sc) | |
104 | { | |
105 | kfree(sc->symbol); | |
106 | kfree(sc); | |
107 | } | |
108 | ||
109 | struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) | |
110 | { | |
111 | struct symbol_cache *sc; | |
112 | ||
113 | if (!sym || strlen(sym) == 0) | |
114 | return NULL; | |
115 | ||
116 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); | |
117 | if (!sc) | |
118 | return NULL; | |
119 | ||
120 | sc->symbol = kstrdup(sym, GFP_KERNEL); | |
121 | if (!sc->symbol) { | |
122 | kfree(sc); | |
123 | return NULL; | |
124 | } | |
125 | sc->offset = offset; | |
126 | update_symbol_cache(sc); | |
127 | ||
128 | return sc; | |
129 | } | |
130 | ||
3fd996a2 NK |
131 | /* |
132 | * Kprobes-specific fetch functions | |
133 | */ | |
134 | #define DEFINE_FETCH_stack(type) \ | |
135 | static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\ | |
136 | void *offset, void *dest) \ | |
137 | { \ | |
138 | *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \ | |
139 | (unsigned int)((unsigned long)offset)); \ | |
140 | } | |
141 | DEFINE_BASIC_FETCH_FUNCS(stack) | |
142 | /* No string on the stack entry */ | |
143 | #define fetch_stack_string NULL | |
144 | #define fetch_stack_string_size NULL | |
145 | ||
5baaa59e NK |
146 | #define DEFINE_FETCH_memory(type) \ |
147 | static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\ | |
148 | void *addr, void *dest) \ | |
149 | { \ | |
150 | type retval; \ | |
151 | if (probe_kernel_address(addr, retval)) \ | |
152 | *(type *)dest = 0; \ | |
153 | else \ | |
154 | *(type *)dest = retval; \ | |
155 | } | |
156 | DEFINE_BASIC_FETCH_FUNCS(memory) | |
157 | /* | |
158 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
159 | * length and relative data location. | |
160 | */ | |
161 | static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, | |
162 | void *addr, void *dest) | |
163 | { | |
164 | long ret; | |
165 | int maxlen = get_rloc_len(*(u32 *)dest); | |
166 | u8 *dst = get_rloc_data(dest); | |
167 | u8 *src = addr; | |
168 | mm_segment_t old_fs = get_fs(); | |
169 | ||
170 | if (!maxlen) | |
171 | return; | |
172 | ||
173 | /* | |
174 | * Try to get string again, since the string can be changed while | |
175 | * probing. | |
176 | */ | |
177 | set_fs(KERNEL_DS); | |
178 | pagefault_disable(); | |
179 | ||
180 | do | |
181 | ret = __copy_from_user_inatomic(dst++, src++, 1); | |
182 | while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen); | |
183 | ||
184 | dst[-1] = '\0'; | |
185 | pagefault_enable(); | |
186 | set_fs(old_fs); | |
187 | ||
188 | if (ret < 0) { /* Failed to fetch string */ | |
189 | ((u8 *)get_rloc_data(dest))[0] = '\0'; | |
190 | *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest)); | |
191 | } else { | |
192 | *(u32 *)dest = make_data_rloc(src - (u8 *)addr, | |
193 | get_rloc_offs(*(u32 *)dest)); | |
194 | } | |
195 | } | |
196 | ||
197 | /* Return the length of string -- including null terminal byte */ | |
198 | static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, | |
199 | void *addr, void *dest) | |
200 | { | |
201 | mm_segment_t old_fs; | |
202 | int ret, len = 0; | |
203 | u8 c; | |
204 | ||
205 | old_fs = get_fs(); | |
206 | set_fs(KERNEL_DS); | |
207 | pagefault_disable(); | |
208 | ||
209 | do { | |
210 | ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1); | |
211 | len++; | |
212 | } while (c && ret == 0 && len < MAX_STRING_SIZE); | |
213 | ||
214 | pagefault_enable(); | |
215 | set_fs(old_fs); | |
216 | ||
217 | if (ret < 0) /* Failed to check the length */ | |
218 | *(u32 *)dest = 0; | |
219 | else | |
220 | *(u32 *)dest = len; | |
221 | } | |
222 | ||
1301a44e NK |
223 | #define DEFINE_FETCH_symbol(type) \ |
224 | __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, \ | |
225 | void *data, void *dest) \ | |
226 | { \ | |
227 | struct symbol_cache *sc = data; \ | |
228 | if (sc->addr) \ | |
229 | fetch_memory_##type(regs, (void *)sc->addr, dest); \ | |
230 | else \ | |
231 | *(type *)dest = 0; \ | |
232 | } | |
233 | DEFINE_BASIC_FETCH_FUNCS(symbol) | |
234 | DEFINE_FETCH_symbol(string) | |
235 | DEFINE_FETCH_symbol(string_size) | |
236 | ||
b7e0bf34 NK |
237 | /* kprobes don't support file_offset fetch methods */ |
238 | #define fetch_file_offset_u8 NULL | |
239 | #define fetch_file_offset_u16 NULL | |
240 | #define fetch_file_offset_u32 NULL | |
241 | #define fetch_file_offset_u64 NULL | |
242 | #define fetch_file_offset_string NULL | |
243 | #define fetch_file_offset_string_size NULL | |
244 | ||
34fee3a1 NK |
245 | /* Fetch type information table */ |
246 | const struct fetch_type kprobes_fetch_type_table[] = { | |
247 | /* Special types */ | |
248 | [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, | |
249 | sizeof(u32), 1, "__data_loc char[]"), | |
250 | [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, | |
251 | string_size, sizeof(u32), 0, "u32"), | |
252 | /* Basic types */ | |
253 | ASSIGN_FETCH_TYPE(u8, u8, 0), | |
254 | ASSIGN_FETCH_TYPE(u16, u16, 0), | |
255 | ASSIGN_FETCH_TYPE(u32, u32, 0), | |
256 | ASSIGN_FETCH_TYPE(u64, u64, 0), | |
257 | ASSIGN_FETCH_TYPE(s8, u8, 1), | |
258 | ASSIGN_FETCH_TYPE(s16, u16, 1), | |
259 | ASSIGN_FETCH_TYPE(s32, u32, 1), | |
260 | ASSIGN_FETCH_TYPE(s64, u64, 1), | |
261 | ||
262 | ASSIGN_FETCH_TYPE_END | |
263 | }; | |
264 | ||
4a846b44 MH |
265 | /* |
266 | * Allocate new trace_probe and initialize it (including kprobes). | |
267 | */ | |
c31ffb3f | 268 | static struct trace_kprobe *alloc_trace_kprobe(const char *group, |
f52487e9 | 269 | const char *event, |
4a846b44 MH |
270 | void *addr, |
271 | const char *symbol, | |
272 | unsigned long offs, | |
3a6b7666 | 273 | int nargs, bool is_return) |
413d37d1 | 274 | { |
c31ffb3f | 275 | struct trace_kprobe *tk; |
6f3cf440 | 276 | int ret = -ENOMEM; |
413d37d1 | 277 | |
c31ffb3f NK |
278 | tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL); |
279 | if (!tk) | |
6f3cf440 | 280 | return ERR_PTR(ret); |
413d37d1 MH |
281 | |
282 | if (symbol) { | |
c31ffb3f NK |
283 | tk->symbol = kstrdup(symbol, GFP_KERNEL); |
284 | if (!tk->symbol) | |
413d37d1 | 285 | goto error; |
c31ffb3f NK |
286 | tk->rp.kp.symbol_name = tk->symbol; |
287 | tk->rp.kp.offset = offs; | |
4a846b44 | 288 | } else |
c31ffb3f | 289 | tk->rp.kp.addr = addr; |
4a846b44 MH |
290 | |
291 | if (is_return) | |
c31ffb3f | 292 | tk->rp.handler = kretprobe_dispatcher; |
4a846b44 | 293 | else |
c31ffb3f | 294 | tk->rp.kp.pre_handler = kprobe_dispatcher; |
4a846b44 | 295 | |
da34634f | 296 | if (!event || !is_good_name(event)) { |
6f3cf440 | 297 | ret = -EINVAL; |
4263565d | 298 | goto error; |
6f3cf440 MH |
299 | } |
300 | ||
c31ffb3f NK |
301 | tk->tp.call.class = &tk->tp.class; |
302 | tk->tp.call.name = kstrdup(event, GFP_KERNEL); | |
303 | if (!tk->tp.call.name) | |
4263565d | 304 | goto error; |
413d37d1 | 305 | |
da34634f | 306 | if (!group || !is_good_name(group)) { |
6f3cf440 | 307 | ret = -EINVAL; |
f52487e9 | 308 | goto error; |
6f3cf440 MH |
309 | } |
310 | ||
c31ffb3f NK |
311 | tk->tp.class.system = kstrdup(group, GFP_KERNEL); |
312 | if (!tk->tp.class.system) | |
f52487e9 MH |
313 | goto error; |
314 | ||
c31ffb3f NK |
315 | INIT_LIST_HEAD(&tk->list); |
316 | INIT_LIST_HEAD(&tk->tp.files); | |
317 | return tk; | |
413d37d1 | 318 | error: |
c31ffb3f NK |
319 | kfree(tk->tp.call.name); |
320 | kfree(tk->symbol); | |
321 | kfree(tk); | |
6f3cf440 | 322 | return ERR_PTR(ret); |
413d37d1 MH |
323 | } |
324 | ||
c31ffb3f | 325 | static void free_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 MH |
326 | { |
327 | int i; | |
328 | ||
c31ffb3f NK |
329 | for (i = 0; i < tk->tp.nr_args; i++) |
330 | traceprobe_free_probe_arg(&tk->tp.args[i]); | |
413d37d1 | 331 | |
c31ffb3f NK |
332 | kfree(tk->tp.call.class->system); |
333 | kfree(tk->tp.call.name); | |
334 | kfree(tk->symbol); | |
335 | kfree(tk); | |
413d37d1 MH |
336 | } |
337 | ||
c31ffb3f NK |
338 | static struct trace_kprobe *find_trace_kprobe(const char *event, |
339 | const char *group) | |
413d37d1 | 340 | { |
c31ffb3f | 341 | struct trace_kprobe *tk; |
413d37d1 | 342 | |
c31ffb3f NK |
343 | list_for_each_entry(tk, &probe_list, list) |
344 | if (strcmp(tk->tp.call.name, event) == 0 && | |
345 | strcmp(tk->tp.call.class->system, group) == 0) | |
346 | return tk; | |
413d37d1 MH |
347 | return NULL; |
348 | } | |
349 | ||
41a7dd42 MH |
350 | /* |
351 | * Enable trace_probe | |
352 | * if the file is NULL, enable "perf" handler, or enable "trace" handler. | |
353 | */ | |
354 | static int | |
c31ffb3f | 355 | enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file) |
1538f888 MH |
356 | { |
357 | int ret = 0; | |
358 | ||
41a7dd42 | 359 | if (file) { |
b04d52e3 ON |
360 | struct event_file_link *link; |
361 | ||
362 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
363 | if (!link) { | |
41a7dd42 | 364 | ret = -ENOMEM; |
3fe3d619 | 365 | goto out; |
41a7dd42 | 366 | } |
41a7dd42 | 367 | |
b04d52e3 | 368 | link->file = file; |
c31ffb3f | 369 | list_add_tail_rcu(&link->list, &tk->tp.files); |
41a7dd42 | 370 | |
c31ffb3f | 371 | tk->tp.flags |= TP_FLAG_TRACE; |
41a7dd42 | 372 | } else |
c31ffb3f | 373 | tk->tp.flags |= TP_FLAG_PROFILE; |
41a7dd42 | 374 | |
c31ffb3f NK |
375 | if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) { |
376 | if (trace_kprobe_is_return(tk)) | |
377 | ret = enable_kretprobe(&tk->rp); | |
1538f888 | 378 | else |
c31ffb3f | 379 | ret = enable_kprobe(&tk->rp.kp); |
1538f888 | 380 | } |
3fe3d619 | 381 | out: |
1538f888 MH |
382 | return ret; |
383 | } | |
384 | ||
41a7dd42 MH |
385 | /* |
386 | * Disable trace_probe | |
387 | * if the file is NULL, disable "perf" handler, or disable "trace" handler. | |
388 | */ | |
389 | static int | |
c31ffb3f | 390 | disable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file) |
1538f888 | 391 | { |
a232e270 MH |
392 | struct event_file_link *link = NULL; |
393 | int wait = 0; | |
41a7dd42 MH |
394 | int ret = 0; |
395 | ||
41a7dd42 | 396 | if (file) { |
c31ffb3f | 397 | link = find_event_file_link(&tk->tp, file); |
b04d52e3 | 398 | if (!link) { |
41a7dd42 | 399 | ret = -EINVAL; |
3fe3d619 | 400 | goto out; |
41a7dd42 MH |
401 | } |
402 | ||
b04d52e3 | 403 | list_del_rcu(&link->list); |
a232e270 | 404 | wait = 1; |
c31ffb3f | 405 | if (!list_empty(&tk->tp.files)) |
b04d52e3 | 406 | goto out; |
41a7dd42 | 407 | |
c31ffb3f | 408 | tk->tp.flags &= ~TP_FLAG_TRACE; |
41a7dd42 | 409 | } else |
c31ffb3f | 410 | tk->tp.flags &= ~TP_FLAG_PROFILE; |
41a7dd42 | 411 | |
c31ffb3f NK |
412 | if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) { |
413 | if (trace_kprobe_is_return(tk)) | |
414 | disable_kretprobe(&tk->rp); | |
1538f888 | 415 | else |
c31ffb3f | 416 | disable_kprobe(&tk->rp.kp); |
a232e270 | 417 | wait = 1; |
1538f888 | 418 | } |
3fe3d619 | 419 | out: |
a232e270 MH |
420 | if (wait) { |
421 | /* | |
422 | * Synchronize with kprobe_trace_func/kretprobe_trace_func | |
423 | * to ensure disabled (all running handlers are finished). | |
424 | * This is not only for kfree(), but also the caller, | |
425 | * trace_remove_event_call() supposes it for releasing | |
426 | * event_call related objects, which will be accessed in | |
427 | * the kprobe_trace_func/kretprobe_trace_func. | |
428 | */ | |
429 | synchronize_sched(); | |
430 | kfree(link); /* Ignored if link == NULL */ | |
431 | } | |
432 | ||
41a7dd42 | 433 | return ret; |
1538f888 MH |
434 | } |
435 | ||
61424318 | 436 | /* Internal register function - just handle k*probes and flags */ |
c31ffb3f | 437 | static int __register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 438 | { |
7f6878a3 | 439 | int i, ret; |
61424318 | 440 | |
c31ffb3f | 441 | if (trace_probe_is_registered(&tk->tp)) |
61424318 MH |
442 | return -EINVAL; |
443 | ||
c31ffb3f NK |
444 | for (i = 0; i < tk->tp.nr_args; i++) |
445 | traceprobe_update_arg(&tk->tp.args[i]); | |
7f6878a3 | 446 | |
61424318 | 447 | /* Set/clear disabled flag according to tp->flag */ |
c31ffb3f NK |
448 | if (trace_probe_is_enabled(&tk->tp)) |
449 | tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; | |
61424318 | 450 | else |
c31ffb3f | 451 | tk->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
61424318 | 452 | |
c31ffb3f NK |
453 | if (trace_kprobe_is_return(tk)) |
454 | ret = register_kretprobe(&tk->rp); | |
413d37d1 | 455 | else |
c31ffb3f | 456 | ret = register_kprobe(&tk->rp.kp); |
61424318 MH |
457 | |
458 | if (ret == 0) | |
c31ffb3f | 459 | tk->tp.flags |= TP_FLAG_REGISTERED; |
61424318 MH |
460 | else { |
461 | pr_warning("Could not insert probe at %s+%lu: %d\n", | |
c31ffb3f NK |
462 | trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret); |
463 | if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) { | |
61424318 MH |
464 | pr_warning("This probe might be able to register after" |
465 | "target module is loaded. Continue.\n"); | |
466 | ret = 0; | |
467 | } else if (ret == -EILSEQ) { | |
468 | pr_warning("Probing address(0x%p) is not an " | |
469 | "instruction boundary.\n", | |
c31ffb3f | 470 | tk->rp.kp.addr); |
61424318 MH |
471 | ret = -EINVAL; |
472 | } | |
473 | } | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
478 | /* Internal unregister function - just handle k*probes and flags */ | |
c31ffb3f | 479 | static void __unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 480 | { |
c31ffb3f NK |
481 | if (trace_probe_is_registered(&tk->tp)) { |
482 | if (trace_kprobe_is_return(tk)) | |
483 | unregister_kretprobe(&tk->rp); | |
61424318 | 484 | else |
c31ffb3f NK |
485 | unregister_kprobe(&tk->rp.kp); |
486 | tk->tp.flags &= ~TP_FLAG_REGISTERED; | |
61424318 | 487 | /* Cleanup kprobe for reuse */ |
c31ffb3f NK |
488 | if (tk->rp.kp.symbol_name) |
489 | tk->rp.kp.addr = NULL; | |
61424318 MH |
490 | } |
491 | } | |
492 | ||
493 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ | |
c31ffb3f | 494 | static int unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 495 | { |
02ca1521 | 496 | /* Enabled event can not be unregistered */ |
c31ffb3f | 497 | if (trace_probe_is_enabled(&tk->tp)) |
02ca1521 MH |
498 | return -EBUSY; |
499 | ||
40c32592 | 500 | /* Will fail if probe is being used by ftrace or perf */ |
c31ffb3f | 501 | if (unregister_kprobe_event(tk)) |
40c32592 SRRH |
502 | return -EBUSY; |
503 | ||
c31ffb3f NK |
504 | __unregister_trace_kprobe(tk); |
505 | list_del(&tk->list); | |
02ca1521 MH |
506 | |
507 | return 0; | |
413d37d1 MH |
508 | } |
509 | ||
510 | /* Register a trace_probe and probe_event */ | |
c31ffb3f | 511 | static int register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 512 | { |
c31ffb3f | 513 | struct trace_kprobe *old_tk; |
413d37d1 MH |
514 | int ret; |
515 | ||
516 | mutex_lock(&probe_lock); | |
517 | ||
61424318 | 518 | /* Delete old (same name) event if exist */ |
c31ffb3f NK |
519 | old_tk = find_trace_kprobe(tk->tp.call.name, tk->tp.call.class->system); |
520 | if (old_tk) { | |
521 | ret = unregister_trace_kprobe(old_tk); | |
02ca1521 MH |
522 | if (ret < 0) |
523 | goto end; | |
c31ffb3f | 524 | free_trace_kprobe(old_tk); |
2d5e067e | 525 | } |
61424318 MH |
526 | |
527 | /* Register new event */ | |
c31ffb3f | 528 | ret = register_kprobe_event(tk); |
2d5e067e | 529 | if (ret) { |
426d3107 | 530 | pr_warning("Failed to register probe event(%d)\n", ret); |
2d5e067e MH |
531 | goto end; |
532 | } | |
533 | ||
61424318 | 534 | /* Register k*probe */ |
c31ffb3f | 535 | ret = __register_trace_kprobe(tk); |
61424318 | 536 | if (ret < 0) |
c31ffb3f | 537 | unregister_kprobe_event(tk); |
61424318 | 538 | else |
c31ffb3f | 539 | list_add_tail(&tk->list, &probe_list); |
61424318 | 540 | |
413d37d1 MH |
541 | end: |
542 | mutex_unlock(&probe_lock); | |
543 | return ret; | |
544 | } | |
545 | ||
61424318 | 546 | /* Module notifier call back, checking event on the module */ |
c31ffb3f | 547 | static int trace_kprobe_module_callback(struct notifier_block *nb, |
61424318 MH |
548 | unsigned long val, void *data) |
549 | { | |
550 | struct module *mod = data; | |
c31ffb3f | 551 | struct trace_kprobe *tk; |
61424318 MH |
552 | int ret; |
553 | ||
554 | if (val != MODULE_STATE_COMING) | |
555 | return NOTIFY_DONE; | |
556 | ||
557 | /* Update probes on coming module */ | |
558 | mutex_lock(&probe_lock); | |
c31ffb3f NK |
559 | list_for_each_entry(tk, &probe_list, list) { |
560 | if (trace_kprobe_within_module(tk, mod)) { | |
02ca1521 | 561 | /* Don't need to check busy - this should have gone. */ |
c31ffb3f NK |
562 | __unregister_trace_kprobe(tk); |
563 | ret = __register_trace_kprobe(tk); | |
61424318 MH |
564 | if (ret) |
565 | pr_warning("Failed to re-register probe %s on" | |
566 | "%s: %d\n", | |
c31ffb3f | 567 | tk->tp.call.name, mod->name, ret); |
61424318 MH |
568 | } |
569 | } | |
570 | mutex_unlock(&probe_lock); | |
571 | ||
572 | return NOTIFY_DONE; | |
573 | } | |
574 | ||
c31ffb3f NK |
575 | static struct notifier_block trace_kprobe_module_nb = { |
576 | .notifier_call = trace_kprobe_module_callback, | |
61424318 MH |
577 | .priority = 1 /* Invoked after kprobe module callback */ |
578 | }; | |
579 | ||
c31ffb3f | 580 | static int create_trace_kprobe(int argc, char **argv) |
413d37d1 MH |
581 | { |
582 | /* | |
583 | * Argument syntax: | |
61424318 MH |
584 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
585 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] | |
413d37d1 | 586 | * Fetch args: |
2e06ff63 MH |
587 | * $retval : fetch return value |
588 | * $stack : fetch stack address | |
589 | * $stackN : fetch Nth of stack (N:0-) | |
413d37d1 MH |
590 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
591 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) | |
592 | * %REG : fetch register REG | |
93ccae7a | 593 | * Dereferencing memory fetch: |
413d37d1 | 594 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
eca0d916 MH |
595 | * Alias name of args: |
596 | * NAME=FETCHARG : set NAME as alias of FETCHARG. | |
93ccae7a MH |
597 | * Type of args: |
598 | * FETCHARG:TYPE : use TYPE instead of unsigned long. | |
413d37d1 | 599 | */ |
c31ffb3f | 600 | struct trace_kprobe *tk; |
413d37d1 | 601 | int i, ret = 0; |
3a6b7666 | 602 | bool is_return = false, is_delete = false; |
93ccae7a | 603 | char *symbol = NULL, *event = NULL, *group = NULL; |
da34634f | 604 | char *arg; |
2fba0c88 | 605 | unsigned long offset = 0; |
413d37d1 | 606 | void *addr = NULL; |
4a846b44 | 607 | char buf[MAX_EVENT_NAME_LEN]; |
413d37d1 | 608 | |
a7c312be | 609 | /* argc must be >= 1 */ |
413d37d1 | 610 | if (argv[0][0] == 'p') |
3a6b7666 | 611 | is_return = false; |
413d37d1 | 612 | else if (argv[0][0] == 'r') |
3a6b7666 | 613 | is_return = true; |
a7c312be | 614 | else if (argv[0][0] == '-') |
3a6b7666 | 615 | is_delete = true; |
e63cc239 | 616 | else { |
a7c312be MH |
617 | pr_info("Probe definition must be started with 'p', 'r' or" |
618 | " '-'.\n"); | |
413d37d1 | 619 | return -EINVAL; |
e63cc239 | 620 | } |
413d37d1 MH |
621 | |
622 | if (argv[0][1] == ':') { | |
623 | event = &argv[0][2]; | |
f52487e9 MH |
624 | if (strchr(event, '/')) { |
625 | group = event; | |
626 | event = strchr(group, '/') + 1; | |
627 | event[-1] = '\0'; | |
628 | if (strlen(group) == 0) { | |
a5efd925 | 629 | pr_info("Group name is not specified\n"); |
f52487e9 MH |
630 | return -EINVAL; |
631 | } | |
632 | } | |
413d37d1 | 633 | if (strlen(event) == 0) { |
a5efd925 | 634 | pr_info("Event name is not specified\n"); |
413d37d1 MH |
635 | return -EINVAL; |
636 | } | |
637 | } | |
a7c312be MH |
638 | if (!group) |
639 | group = KPROBE_EVENT_SYSTEM; | |
413d37d1 | 640 | |
a7c312be MH |
641 | if (is_delete) { |
642 | if (!event) { | |
643 | pr_info("Delete command needs an event name.\n"); | |
644 | return -EINVAL; | |
645 | } | |
9da79ab8 | 646 | mutex_lock(&probe_lock); |
c31ffb3f NK |
647 | tk = find_trace_kprobe(event, group); |
648 | if (!tk) { | |
9da79ab8 | 649 | mutex_unlock(&probe_lock); |
a7c312be MH |
650 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
651 | return -ENOENT; | |
652 | } | |
653 | /* delete an event */ | |
c31ffb3f | 654 | ret = unregister_trace_kprobe(tk); |
02ca1521 | 655 | if (ret == 0) |
c31ffb3f | 656 | free_trace_kprobe(tk); |
9da79ab8 | 657 | mutex_unlock(&probe_lock); |
02ca1521 | 658 | return ret; |
a7c312be MH |
659 | } |
660 | ||
661 | if (argc < 2) { | |
662 | pr_info("Probe point is not specified.\n"); | |
663 | return -EINVAL; | |
664 | } | |
413d37d1 | 665 | if (isdigit(argv[1][0])) { |
e63cc239 MH |
666 | if (is_return) { |
667 | pr_info("Return probe point must be a symbol.\n"); | |
413d37d1 | 668 | return -EINVAL; |
e63cc239 | 669 | } |
413d37d1 | 670 | /* an address specified */ |
bcd83ea6 | 671 | ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); |
e63cc239 MH |
672 | if (ret) { |
673 | pr_info("Failed to parse address.\n"); | |
413d37d1 | 674 | return ret; |
e63cc239 | 675 | } |
413d37d1 MH |
676 | } else { |
677 | /* a symbol specified */ | |
678 | symbol = argv[1]; | |
679 | /* TODO: support .init module functions */ | |
8ab83f56 | 680 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
e63cc239 MH |
681 | if (ret) { |
682 | pr_info("Failed to parse symbol.\n"); | |
413d37d1 | 683 | return ret; |
e63cc239 MH |
684 | } |
685 | if (offset && is_return) { | |
686 | pr_info("Return probe must be used without offset.\n"); | |
413d37d1 | 687 | return -EINVAL; |
e63cc239 | 688 | } |
413d37d1 | 689 | } |
a82378d8 | 690 | argc -= 2; argv += 2; |
413d37d1 MH |
691 | |
692 | /* setup a probe */ | |
4263565d MH |
693 | if (!event) { |
694 | /* Make a new event name */ | |
4263565d | 695 | if (symbol) |
6f3cf440 | 696 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
4263565d MH |
697 | is_return ? 'r' : 'p', symbol, offset); |
698 | else | |
6f3cf440 | 699 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
4263565d | 700 | is_return ? 'r' : 'p', addr); |
4a846b44 MH |
701 | event = buf; |
702 | } | |
c31ffb3f | 703 | tk = alloc_trace_kprobe(group, event, addr, symbol, offset, argc, |
f52487e9 | 704 | is_return); |
c31ffb3f | 705 | if (IS_ERR(tk)) { |
e63cc239 | 706 | pr_info("Failed to allocate trace_probe.(%d)\n", |
c31ffb3f NK |
707 | (int)PTR_ERR(tk)); |
708 | return PTR_ERR(tk); | |
e63cc239 | 709 | } |
413d37d1 | 710 | |
413d37d1 | 711 | /* parse arguments */ |
a82378d8 MH |
712 | ret = 0; |
713 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { | |
c31ffb3f NK |
714 | struct probe_arg *parg = &tk->tp.args[i]; |
715 | ||
61a52736 | 716 | /* Increment count for freeing args in error case */ |
c31ffb3f | 717 | tk->tp.nr_args++; |
61a52736 | 718 | |
eca0d916 MH |
719 | /* Parse argument name */ |
720 | arg = strchr(argv[i], '='); | |
aba91595 | 721 | if (arg) { |
eca0d916 | 722 | *arg++ = '\0'; |
c31ffb3f | 723 | parg->name = kstrdup(argv[i], GFP_KERNEL); |
aba91595 | 724 | } else { |
eca0d916 | 725 | arg = argv[i]; |
aba91595 MH |
726 | /* If argument name is omitted, set "argN" */ |
727 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); | |
c31ffb3f | 728 | parg->name = kstrdup(buf, GFP_KERNEL); |
aba91595 | 729 | } |
a703d946 | 730 | |
c31ffb3f | 731 | if (!parg->name) { |
aba91595 | 732 | pr_info("Failed to allocate argument[%d] name.\n", i); |
ba8665d7 | 733 | ret = -ENOMEM; |
413d37d1 MH |
734 | goto error; |
735 | } | |
da34634f | 736 | |
c31ffb3f | 737 | if (!is_good_name(parg->name)) { |
da34634f | 738 | pr_info("Invalid argument[%d] name: %s\n", |
c31ffb3f | 739 | i, parg->name); |
da34634f MH |
740 | ret = -EINVAL; |
741 | goto error; | |
742 | } | |
93ccae7a | 743 | |
c31ffb3f NK |
744 | if (traceprobe_conflict_field_name(parg->name, |
745 | tk->tp.args, i)) { | |
aba91595 | 746 | pr_info("Argument[%d] name '%s' conflicts with " |
93ccae7a MH |
747 | "another field.\n", i, argv[i]); |
748 | ret = -EINVAL; | |
749 | goto error; | |
750 | } | |
ba8665d7 MH |
751 | |
752 | /* Parse fetch argument */ | |
c31ffb3f | 753 | ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg, |
f3f096cf | 754 | is_return, true); |
e63cc239 | 755 | if (ret) { |
aba91595 | 756 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
413d37d1 | 757 | goto error; |
e63cc239 | 758 | } |
413d37d1 | 759 | } |
413d37d1 | 760 | |
c31ffb3f | 761 | ret = register_trace_kprobe(tk); |
413d37d1 MH |
762 | if (ret) |
763 | goto error; | |
764 | return 0; | |
765 | ||
766 | error: | |
c31ffb3f | 767 | free_trace_kprobe(tk); |
413d37d1 MH |
768 | return ret; |
769 | } | |
770 | ||
c31ffb3f | 771 | static int release_all_trace_kprobes(void) |
413d37d1 | 772 | { |
c31ffb3f | 773 | struct trace_kprobe *tk; |
02ca1521 | 774 | int ret = 0; |
413d37d1 MH |
775 | |
776 | mutex_lock(&probe_lock); | |
02ca1521 | 777 | /* Ensure no probe is in use. */ |
c31ffb3f NK |
778 | list_for_each_entry(tk, &probe_list, list) |
779 | if (trace_probe_is_enabled(&tk->tp)) { | |
02ca1521 MH |
780 | ret = -EBUSY; |
781 | goto end; | |
782 | } | |
413d37d1 MH |
783 | /* TODO: Use batch unregistration */ |
784 | while (!list_empty(&probe_list)) { | |
c31ffb3f NK |
785 | tk = list_entry(probe_list.next, struct trace_kprobe, list); |
786 | ret = unregister_trace_kprobe(tk); | |
40c32592 SRRH |
787 | if (ret) |
788 | goto end; | |
c31ffb3f | 789 | free_trace_kprobe(tk); |
413d37d1 | 790 | } |
02ca1521 MH |
791 | |
792 | end: | |
413d37d1 | 793 | mutex_unlock(&probe_lock); |
02ca1521 MH |
794 | |
795 | return ret; | |
413d37d1 MH |
796 | } |
797 | ||
413d37d1 MH |
798 | /* Probes listing interfaces */ |
799 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) | |
800 | { | |
801 | mutex_lock(&probe_lock); | |
802 | return seq_list_start(&probe_list, *pos); | |
803 | } | |
804 | ||
805 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
806 | { | |
807 | return seq_list_next(v, &probe_list, pos); | |
808 | } | |
809 | ||
810 | static void probes_seq_stop(struct seq_file *m, void *v) | |
811 | { | |
812 | mutex_unlock(&probe_lock); | |
813 | } | |
814 | ||
815 | static int probes_seq_show(struct seq_file *m, void *v) | |
816 | { | |
c31ffb3f | 817 | struct trace_kprobe *tk = v; |
93ccae7a | 818 | int i; |
413d37d1 | 819 | |
c31ffb3f NK |
820 | seq_printf(m, "%c", trace_kprobe_is_return(tk) ? 'r' : 'p'); |
821 | seq_printf(m, ":%s/%s", tk->tp.call.class->system, tk->tp.call.name); | |
413d37d1 | 822 | |
c31ffb3f NK |
823 | if (!tk->symbol) |
824 | seq_printf(m, " 0x%p", tk->rp.kp.addr); | |
825 | else if (tk->rp.kp.offset) | |
826 | seq_printf(m, " %s+%u", trace_kprobe_symbol(tk), | |
827 | tk->rp.kp.offset); | |
413d37d1 | 828 | else |
c31ffb3f | 829 | seq_printf(m, " %s", trace_kprobe_symbol(tk)); |
413d37d1 | 830 | |
c31ffb3f NK |
831 | for (i = 0; i < tk->tp.nr_args; i++) |
832 | seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm); | |
413d37d1 | 833 | seq_printf(m, "\n"); |
93ccae7a | 834 | |
413d37d1 MH |
835 | return 0; |
836 | } | |
837 | ||
838 | static const struct seq_operations probes_seq_op = { | |
839 | .start = probes_seq_start, | |
840 | .next = probes_seq_next, | |
841 | .stop = probes_seq_stop, | |
842 | .show = probes_seq_show | |
843 | }; | |
844 | ||
845 | static int probes_open(struct inode *inode, struct file *file) | |
846 | { | |
02ca1521 MH |
847 | int ret; |
848 | ||
849 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { | |
c31ffb3f | 850 | ret = release_all_trace_kprobes(); |
02ca1521 MH |
851 | if (ret < 0) |
852 | return ret; | |
853 | } | |
413d37d1 MH |
854 | |
855 | return seq_open(file, &probes_seq_op); | |
856 | } | |
857 | ||
413d37d1 MH |
858 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
859 | size_t count, loff_t *ppos) | |
860 | { | |
8ab83f56 | 861 | return traceprobe_probes_write(file, buffer, count, ppos, |
c31ffb3f | 862 | create_trace_kprobe); |
413d37d1 MH |
863 | } |
864 | ||
865 | static const struct file_operations kprobe_events_ops = { | |
866 | .owner = THIS_MODULE, | |
867 | .open = probes_open, | |
868 | .read = seq_read, | |
869 | .llseek = seq_lseek, | |
870 | .release = seq_release, | |
871 | .write = probes_write, | |
872 | }; | |
873 | ||
cd7e7bd5 MH |
874 | /* Probes profiling interfaces */ |
875 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
876 | { | |
c31ffb3f | 877 | struct trace_kprobe *tk = v; |
cd7e7bd5 | 878 | |
c31ffb3f NK |
879 | seq_printf(m, " %-44s %15lu %15lu\n", tk->tp.call.name, tk->nhit, |
880 | tk->rp.kp.nmissed); | |
cd7e7bd5 MH |
881 | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static const struct seq_operations profile_seq_op = { | |
886 | .start = probes_seq_start, | |
887 | .next = probes_seq_next, | |
888 | .stop = probes_seq_stop, | |
889 | .show = probes_profile_seq_show | |
890 | }; | |
891 | ||
892 | static int profile_open(struct inode *inode, struct file *file) | |
893 | { | |
894 | return seq_open(file, &profile_seq_op); | |
895 | } | |
896 | ||
897 | static const struct file_operations kprobe_profile_ops = { | |
898 | .owner = THIS_MODULE, | |
899 | .open = profile_open, | |
900 | .read = seq_read, | |
901 | .llseek = seq_lseek, | |
902 | .release = seq_release, | |
903 | }; | |
904 | ||
413d37d1 | 905 | /* Kprobe handler */ |
2b106aab | 906 | static __kprobes void |
c31ffb3f | 907 | __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, |
41a7dd42 | 908 | struct ftrace_event_file *ftrace_file) |
413d37d1 | 909 | { |
93ccae7a | 910 | struct kprobe_trace_entry_head *entry; |
413d37d1 | 911 | struct ring_buffer_event *event; |
8f8ffe24 | 912 | struct ring_buffer *buffer; |
e09c8614 | 913 | int size, dsize, pc; |
413d37d1 | 914 | unsigned long irq_flags; |
c31ffb3f | 915 | struct ftrace_event_call *call = &tk->tp.call; |
413d37d1 | 916 | |
41a7dd42 MH |
917 | WARN_ON(call != ftrace_file->event_call); |
918 | ||
13a1e4ae SRRH |
919 | if (ftrace_trigger_soft_disabled(ftrace_file)) |
920 | return; | |
b8820084 | 921 | |
413d37d1 MH |
922 | local_save_flags(irq_flags); |
923 | pc = preempt_count(); | |
924 | ||
c31ffb3f NK |
925 | dsize = __get_data_size(&tk->tp, regs); |
926 | size = sizeof(*entry) + tk->tp.size + dsize; | |
413d37d1 | 927 | |
41a7dd42 MH |
928 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
929 | call->event.type, | |
930 | size, irq_flags, pc); | |
413d37d1 | 931 | if (!event) |
1e12a4a7 | 932 | return; |
413d37d1 MH |
933 | |
934 | entry = ring_buffer_event_data(event); | |
c31ffb3f NK |
935 | entry->ip = (unsigned long)tk->rp.kp.addr; |
936 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); | |
413d37d1 | 937 | |
13a1e4ae SRRH |
938 | event_trigger_unlock_commit_regs(ftrace_file, buffer, event, |
939 | entry, irq_flags, pc, regs); | |
413d37d1 MH |
940 | } |
941 | ||
41a7dd42 | 942 | static __kprobes void |
c31ffb3f | 943 | kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs) |
41a7dd42 | 944 | { |
b04d52e3 | 945 | struct event_file_link *link; |
41a7dd42 | 946 | |
c31ffb3f NK |
947 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
948 | __kprobe_trace_func(tk, regs, link->file); | |
41a7dd42 MH |
949 | } |
950 | ||
413d37d1 | 951 | /* Kretprobe handler */ |
2b106aab | 952 | static __kprobes void |
c31ffb3f | 953 | __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 MH |
954 | struct pt_regs *regs, |
955 | struct ftrace_event_file *ftrace_file) | |
413d37d1 | 956 | { |
93ccae7a | 957 | struct kretprobe_trace_entry_head *entry; |
413d37d1 | 958 | struct ring_buffer_event *event; |
8f8ffe24 | 959 | struct ring_buffer *buffer; |
e09c8614 | 960 | int size, pc, dsize; |
413d37d1 | 961 | unsigned long irq_flags; |
c31ffb3f | 962 | struct ftrace_event_call *call = &tk->tp.call; |
413d37d1 | 963 | |
41a7dd42 MH |
964 | WARN_ON(call != ftrace_file->event_call); |
965 | ||
13a1e4ae SRRH |
966 | if (ftrace_trigger_soft_disabled(ftrace_file)) |
967 | return; | |
b8820084 | 968 | |
413d37d1 MH |
969 | local_save_flags(irq_flags); |
970 | pc = preempt_count(); | |
971 | ||
c31ffb3f NK |
972 | dsize = __get_data_size(&tk->tp, regs); |
973 | size = sizeof(*entry) + tk->tp.size + dsize; | |
413d37d1 | 974 | |
41a7dd42 MH |
975 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
976 | call->event.type, | |
977 | size, irq_flags, pc); | |
413d37d1 | 978 | if (!event) |
1e12a4a7 | 979 | return; |
413d37d1 MH |
980 | |
981 | entry = ring_buffer_event_data(event); | |
c31ffb3f | 982 | entry->func = (unsigned long)tk->rp.kp.addr; |
413d37d1 | 983 | entry->ret_ip = (unsigned long)ri->ret_addr; |
c31ffb3f | 984 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
413d37d1 | 985 | |
13a1e4ae SRRH |
986 | event_trigger_unlock_commit_regs(ftrace_file, buffer, event, |
987 | entry, irq_flags, pc, regs); | |
413d37d1 MH |
988 | } |
989 | ||
41a7dd42 | 990 | static __kprobes void |
c31ffb3f | 991 | kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 MH |
992 | struct pt_regs *regs) |
993 | { | |
b04d52e3 | 994 | struct event_file_link *link; |
41a7dd42 | 995 | |
c31ffb3f NK |
996 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
997 | __kretprobe_trace_func(tk, ri, regs, link->file); | |
41a7dd42 MH |
998 | } |
999 | ||
413d37d1 | 1000 | /* Event entry printers */ |
b62fdd97 | 1001 | static enum print_line_t |
a9a57763 SR |
1002 | print_kprobe_event(struct trace_iterator *iter, int flags, |
1003 | struct trace_event *event) | |
413d37d1 | 1004 | { |
93ccae7a | 1005 | struct kprobe_trace_entry_head *field; |
413d37d1 | 1006 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1007 | struct trace_probe *tp; |
93ccae7a | 1008 | u8 *data; |
413d37d1 MH |
1009 | int i; |
1010 | ||
93ccae7a | 1011 | field = (struct kprobe_trace_entry_head *)iter->ent; |
80decc70 | 1012 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1013 | |
6e9f23d1 MH |
1014 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
1015 | goto partial; | |
1016 | ||
413d37d1 MH |
1017 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
1018 | goto partial; | |
1019 | ||
6e9f23d1 | 1020 | if (!trace_seq_puts(s, ")")) |
413d37d1 MH |
1021 | goto partial; |
1022 | ||
93ccae7a MH |
1023 | data = (u8 *)&field[1]; |
1024 | for (i = 0; i < tp->nr_args; i++) | |
1025 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1026 | data + tp->args[i].offset, field)) |
413d37d1 MH |
1027 | goto partial; |
1028 | ||
1029 | if (!trace_seq_puts(s, "\n")) | |
1030 | goto partial; | |
1031 | ||
1032 | return TRACE_TYPE_HANDLED; | |
1033 | partial: | |
1034 | return TRACE_TYPE_PARTIAL_LINE; | |
1035 | } | |
1036 | ||
b62fdd97 | 1037 | static enum print_line_t |
a9a57763 SR |
1038 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
1039 | struct trace_event *event) | |
413d37d1 | 1040 | { |
93ccae7a | 1041 | struct kretprobe_trace_entry_head *field; |
413d37d1 | 1042 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1043 | struct trace_probe *tp; |
93ccae7a | 1044 | u8 *data; |
413d37d1 MH |
1045 | int i; |
1046 | ||
93ccae7a | 1047 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
80decc70 | 1048 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1049 | |
6e9f23d1 MH |
1050 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
1051 | goto partial; | |
1052 | ||
413d37d1 MH |
1053 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
1054 | goto partial; | |
1055 | ||
1056 | if (!trace_seq_puts(s, " <- ")) | |
1057 | goto partial; | |
1058 | ||
1059 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) | |
1060 | goto partial; | |
1061 | ||
6e9f23d1 | 1062 | if (!trace_seq_puts(s, ")")) |
413d37d1 MH |
1063 | goto partial; |
1064 | ||
93ccae7a MH |
1065 | data = (u8 *)&field[1]; |
1066 | for (i = 0; i < tp->nr_args; i++) | |
1067 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1068 | data + tp->args[i].offset, field)) |
413d37d1 MH |
1069 | goto partial; |
1070 | ||
1071 | if (!trace_seq_puts(s, "\n")) | |
1072 | goto partial; | |
1073 | ||
1074 | return TRACE_TYPE_HANDLED; | |
1075 | partial: | |
1076 | return TRACE_TYPE_PARTIAL_LINE; | |
1077 | } | |
1078 | ||
413d37d1 MH |
1079 | |
1080 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) | |
1081 | { | |
1082 | int ret, i; | |
93ccae7a | 1083 | struct kprobe_trace_entry_head field; |
c31ffb3f | 1084 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1085 | |
a703d946 | 1086 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
eca0d916 | 1087 | /* Set argument names as fields */ |
c31ffb3f NK |
1088 | for (i = 0; i < tk->tp.nr_args; i++) { |
1089 | struct probe_arg *parg = &tk->tp.args[i]; | |
1090 | ||
1091 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1092 | parg->name, | |
1093 | sizeof(field) + parg->offset, | |
1094 | parg->type->size, | |
1095 | parg->type->is_signed, | |
93ccae7a MH |
1096 | FILTER_OTHER); |
1097 | if (ret) | |
1098 | return ret; | |
1099 | } | |
413d37d1 MH |
1100 | return 0; |
1101 | } | |
1102 | ||
1103 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) | |
1104 | { | |
1105 | int ret, i; | |
93ccae7a | 1106 | struct kretprobe_trace_entry_head field; |
c31ffb3f | 1107 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1108 | |
a703d946 MH |
1109 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
1110 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); | |
eca0d916 | 1111 | /* Set argument names as fields */ |
c31ffb3f NK |
1112 | for (i = 0; i < tk->tp.nr_args; i++) { |
1113 | struct probe_arg *parg = &tk->tp.args[i]; | |
1114 | ||
1115 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1116 | parg->name, | |
1117 | sizeof(field) + parg->offset, | |
1118 | parg->type->size, | |
1119 | parg->type->is_signed, | |
93ccae7a MH |
1120 | FILTER_OTHER); |
1121 | if (ret) | |
1122 | return ret; | |
1123 | } | |
413d37d1 MH |
1124 | return 0; |
1125 | } | |
1126 | ||
07b139c8 | 1127 | #ifdef CONFIG_PERF_EVENTS |
e08d1c65 MH |
1128 | |
1129 | /* Kprobe profile handler */ | |
2b106aab | 1130 | static __kprobes void |
c31ffb3f | 1131 | kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs) |
e08d1c65 | 1132 | { |
c31ffb3f | 1133 | struct ftrace_event_call *call = &tk->tp.call; |
93ccae7a | 1134 | struct kprobe_trace_entry_head *entry; |
1c024eca | 1135 | struct hlist_head *head; |
e09c8614 | 1136 | int size, __size, dsize; |
4ed7c92d | 1137 | int rctx; |
e08d1c65 | 1138 | |
288e984e ON |
1139 | head = this_cpu_ptr(call->perf_events); |
1140 | if (hlist_empty(head)) | |
1141 | return; | |
1142 | ||
c31ffb3f NK |
1143 | dsize = __get_data_size(&tk->tp, regs); |
1144 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1145 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1146 | size -= sizeof(u32); | |
ce71b9df | 1147 | |
ff5f149b | 1148 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
430ad5a6 | 1149 | if (!entry) |
1e12a4a7 | 1150 | return; |
a1a138d0 | 1151 | |
c31ffb3f | 1152 | entry->ip = (unsigned long)tk->rp.kp.addr; |
e09c8614 | 1153 | memset(&entry[1], 0, dsize); |
c31ffb3f | 1154 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
cf6735a4 | 1155 | perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL); |
e08d1c65 MH |
1156 | } |
1157 | ||
1158 | /* Kretprobe profile handler */ | |
2b106aab | 1159 | static __kprobes void |
c31ffb3f | 1160 | kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
2b106aab | 1161 | struct pt_regs *regs) |
e08d1c65 | 1162 | { |
c31ffb3f | 1163 | struct ftrace_event_call *call = &tk->tp.call; |
93ccae7a | 1164 | struct kretprobe_trace_entry_head *entry; |
1c024eca | 1165 | struct hlist_head *head; |
e09c8614 | 1166 | int size, __size, dsize; |
4ed7c92d | 1167 | int rctx; |
e08d1c65 | 1168 | |
288e984e ON |
1169 | head = this_cpu_ptr(call->perf_events); |
1170 | if (hlist_empty(head)) | |
1171 | return; | |
1172 | ||
c31ffb3f NK |
1173 | dsize = __get_data_size(&tk->tp, regs); |
1174 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1175 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1176 | size -= sizeof(u32); | |
444a2a3b | 1177 | |
ff5f149b | 1178 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
430ad5a6 | 1179 | if (!entry) |
1e12a4a7 | 1180 | return; |
e08d1c65 | 1181 | |
c31ffb3f | 1182 | entry->func = (unsigned long)tk->rp.kp.addr; |
a1a138d0 | 1183 | entry->ret_ip = (unsigned long)ri->ret_addr; |
c31ffb3f | 1184 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
cf6735a4 | 1185 | perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL); |
e08d1c65 | 1186 | } |
07b139c8 | 1187 | #endif /* CONFIG_PERF_EVENTS */ |
50d78056 | 1188 | |
3fe3d619 ON |
1189 | /* |
1190 | * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex. | |
1191 | * | |
1192 | * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe | |
1193 | * lockless, but we can't race with this __init function. | |
1194 | */ | |
2239291a | 1195 | static __kprobes |
ceec0b6f JO |
1196 | int kprobe_register(struct ftrace_event_call *event, |
1197 | enum trace_reg type, void *data) | |
2239291a | 1198 | { |
c31ffb3f | 1199 | struct trace_kprobe *tk = (struct trace_kprobe *)event->data; |
41a7dd42 | 1200 | struct ftrace_event_file *file = data; |
1538f888 | 1201 | |
2239291a SR |
1202 | switch (type) { |
1203 | case TRACE_REG_REGISTER: | |
c31ffb3f | 1204 | return enable_trace_kprobe(tk, file); |
2239291a | 1205 | case TRACE_REG_UNREGISTER: |
c31ffb3f | 1206 | return disable_trace_kprobe(tk, file); |
2239291a SR |
1207 | |
1208 | #ifdef CONFIG_PERF_EVENTS | |
1209 | case TRACE_REG_PERF_REGISTER: | |
c31ffb3f | 1210 | return enable_trace_kprobe(tk, NULL); |
2239291a | 1211 | case TRACE_REG_PERF_UNREGISTER: |
c31ffb3f | 1212 | return disable_trace_kprobe(tk, NULL); |
ceec0b6f JO |
1213 | case TRACE_REG_PERF_OPEN: |
1214 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
1215 | case TRACE_REG_PERF_ADD: |
1216 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 1217 | return 0; |
2239291a SR |
1218 | #endif |
1219 | } | |
1220 | return 0; | |
1221 | } | |
50d78056 MH |
1222 | |
1223 | static __kprobes | |
1224 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) | |
1225 | { | |
c31ffb3f | 1226 | struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp); |
e08d1c65 | 1227 | |
c31ffb3f | 1228 | tk->nhit++; |
48182bd2 | 1229 | |
c31ffb3f NK |
1230 | if (tk->tp.flags & TP_FLAG_TRACE) |
1231 | kprobe_trace_func(tk, regs); | |
07b139c8 | 1232 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1233 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1234 | kprobe_perf_func(tk, regs); | |
07b139c8 | 1235 | #endif |
50d78056 MH |
1236 | return 0; /* We don't tweek kernel, so just return 0 */ |
1237 | } | |
1238 | ||
1239 | static __kprobes | |
1240 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) | |
1241 | { | |
c31ffb3f | 1242 | struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp); |
50d78056 | 1243 | |
c31ffb3f | 1244 | tk->nhit++; |
48182bd2 | 1245 | |
c31ffb3f NK |
1246 | if (tk->tp.flags & TP_FLAG_TRACE) |
1247 | kretprobe_trace_func(tk, ri, regs); | |
07b139c8 | 1248 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1249 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1250 | kretprobe_perf_func(tk, ri, regs); | |
07b139c8 | 1251 | #endif |
50d78056 MH |
1252 | return 0; /* We don't tweek kernel, so just return 0 */ |
1253 | } | |
e08d1c65 | 1254 | |
a9a57763 SR |
1255 | static struct trace_event_functions kretprobe_funcs = { |
1256 | .trace = print_kretprobe_event | |
1257 | }; | |
1258 | ||
1259 | static struct trace_event_functions kprobe_funcs = { | |
1260 | .trace = print_kprobe_event | |
1261 | }; | |
1262 | ||
c31ffb3f | 1263 | static int register_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1264 | { |
c31ffb3f | 1265 | struct ftrace_event_call *call = &tk->tp.call; |
413d37d1 MH |
1266 | int ret; |
1267 | ||
1268 | /* Initialize ftrace_event_call */ | |
ffb9f995 | 1269 | INIT_LIST_HEAD(&call->class->fields); |
c31ffb3f | 1270 | if (trace_kprobe_is_return(tk)) { |
80decc70 | 1271 | call->event.funcs = &kretprobe_funcs; |
2e33af02 | 1272 | call->class->define_fields = kretprobe_event_define_fields; |
413d37d1 | 1273 | } else { |
80decc70 | 1274 | call->event.funcs = &kprobe_funcs; |
2e33af02 | 1275 | call->class->define_fields = kprobe_event_define_fields; |
413d37d1 | 1276 | } |
5bf652aa | 1277 | if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) |
a342a028 | 1278 | return -ENOMEM; |
32c0edae SR |
1279 | ret = register_ftrace_event(&call->event); |
1280 | if (!ret) { | |
a342a028 | 1281 | kfree(call->print_fmt); |
ff50d991 | 1282 | return -ENODEV; |
a342a028 | 1283 | } |
553552ce | 1284 | call->flags = 0; |
2239291a | 1285 | call->class->reg = kprobe_register; |
c31ffb3f | 1286 | call->data = tk; |
413d37d1 | 1287 | ret = trace_add_event_call(call); |
ff50d991 | 1288 | if (ret) { |
413d37d1 | 1289 | pr_info("Failed to register kprobe event: %s\n", call->name); |
a342a028 | 1290 | kfree(call->print_fmt); |
80decc70 | 1291 | unregister_ftrace_event(&call->event); |
ff50d991 | 1292 | } |
413d37d1 MH |
1293 | return ret; |
1294 | } | |
1295 | ||
c31ffb3f | 1296 | static int unregister_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1297 | { |
40c32592 SRRH |
1298 | int ret; |
1299 | ||
ff50d991 | 1300 | /* tp->event is unregistered in trace_remove_event_call() */ |
c31ffb3f | 1301 | ret = trace_remove_event_call(&tk->tp.call); |
40c32592 | 1302 | if (!ret) |
c31ffb3f | 1303 | kfree(tk->tp.call.print_fmt); |
40c32592 | 1304 | return ret; |
413d37d1 MH |
1305 | } |
1306 | ||
25985edc | 1307 | /* Make a debugfs interface for controlling probe points */ |
413d37d1 MH |
1308 | static __init int init_kprobe_trace(void) |
1309 | { | |
1310 | struct dentry *d_tracer; | |
1311 | struct dentry *entry; | |
413d37d1 | 1312 | |
c31ffb3f | 1313 | if (register_module_notifier(&trace_kprobe_module_nb)) |
61424318 MH |
1314 | return -EINVAL; |
1315 | ||
413d37d1 MH |
1316 | d_tracer = tracing_init_dentry(); |
1317 | if (!d_tracer) | |
1318 | return 0; | |
1319 | ||
1320 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, | |
1321 | NULL, &kprobe_events_ops); | |
1322 | ||
cd7e7bd5 | 1323 | /* Event list interface */ |
413d37d1 MH |
1324 | if (!entry) |
1325 | pr_warning("Could not create debugfs " | |
1326 | "'kprobe_events' entry\n"); | |
cd7e7bd5 MH |
1327 | |
1328 | /* Profile interface */ | |
1329 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, | |
1330 | NULL, &kprobe_profile_ops); | |
1331 | ||
1332 | if (!entry) | |
1333 | pr_warning("Could not create debugfs " | |
1334 | "'kprobe_profile' entry\n"); | |
413d37d1 MH |
1335 | return 0; |
1336 | } | |
1337 | fs_initcall(init_kprobe_trace); | |
1338 | ||
1339 | ||
1340 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1341 | ||
265a5b7e SR |
1342 | /* |
1343 | * The "__used" keeps gcc from removing the function symbol | |
1344 | * from the kallsyms table. | |
1345 | */ | |
1346 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, | |
1347 | int a4, int a5, int a6) | |
413d37d1 MH |
1348 | { |
1349 | return a1 + a2 + a3 + a4 + a5 + a6; | |
1350 | } | |
1351 | ||
41a7dd42 | 1352 | static struct ftrace_event_file * |
c31ffb3f | 1353 | find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr) |
41a7dd42 MH |
1354 | { |
1355 | struct ftrace_event_file *file; | |
1356 | ||
1357 | list_for_each_entry(file, &tr->events, list) | |
c31ffb3f | 1358 | if (file->event_call == &tk->tp.call) |
41a7dd42 MH |
1359 | return file; |
1360 | ||
1361 | return NULL; | |
1362 | } | |
1363 | ||
3fe3d619 | 1364 | /* |
c31ffb3f | 1365 | * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this |
3fe3d619 ON |
1366 | * stage, we can do this lockless. |
1367 | */ | |
413d37d1 MH |
1368 | static __init int kprobe_trace_self_tests_init(void) |
1369 | { | |
231e36f4 | 1370 | int ret, warn = 0; |
413d37d1 | 1371 | int (*target)(int, int, int, int, int, int); |
c31ffb3f | 1372 | struct trace_kprobe *tk; |
41a7dd42 | 1373 | struct ftrace_event_file *file; |
413d37d1 MH |
1374 | |
1375 | target = kprobe_trace_selftest_target; | |
1376 | ||
1377 | pr_info("Testing kprobe tracing: "); | |
1378 | ||
8ab83f56 SD |
1379 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
1380 | "$stack $stack0 +0($stack)", | |
c31ffb3f | 1381 | create_trace_kprobe); |
231e36f4 | 1382 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1383 | pr_warn("error on probing function entry.\n"); |
231e36f4 MH |
1384 | warn++; |
1385 | } else { | |
1386 | /* Enable trace point */ | |
c31ffb3f NK |
1387 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1388 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1389 | pr_warn("error on getting new probe.\n"); |
231e36f4 | 1390 | warn++; |
41a7dd42 | 1391 | } else { |
c31ffb3f | 1392 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1393 | if (WARN_ON_ONCE(file == NULL)) { |
1394 | pr_warn("error on getting probe file.\n"); | |
1395 | warn++; | |
1396 | } else | |
c31ffb3f | 1397 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1398 | } |
231e36f4 | 1399 | } |
413d37d1 | 1400 | |
8ab83f56 | 1401 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
c31ffb3f | 1402 | "$retval", create_trace_kprobe); |
231e36f4 | 1403 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1404 | pr_warn("error on probing function return.\n"); |
231e36f4 MH |
1405 | warn++; |
1406 | } else { | |
1407 | /* Enable trace point */ | |
c31ffb3f NK |
1408 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1409 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1410 | pr_warn("error on getting 2nd new probe.\n"); |
231e36f4 | 1411 | warn++; |
41a7dd42 | 1412 | } else { |
c31ffb3f | 1413 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1414 | if (WARN_ON_ONCE(file == NULL)) { |
1415 | pr_warn("error on getting probe file.\n"); | |
1416 | warn++; | |
1417 | } else | |
c31ffb3f | 1418 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1419 | } |
231e36f4 MH |
1420 | } |
1421 | ||
1422 | if (warn) | |
1423 | goto end; | |
413d37d1 MH |
1424 | |
1425 | ret = target(1, 2, 3, 4, 5, 6); | |
1426 | ||
02ca1521 | 1427 | /* Disable trace points before removing it */ |
c31ffb3f NK |
1428 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1429 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1430 | pr_warn("error on getting test probe.\n"); |
02ca1521 | 1431 | warn++; |
41a7dd42 | 1432 | } else { |
c31ffb3f | 1433 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1434 | if (WARN_ON_ONCE(file == NULL)) { |
1435 | pr_warn("error on getting probe file.\n"); | |
1436 | warn++; | |
1437 | } else | |
c31ffb3f | 1438 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1439 | } |
02ca1521 | 1440 | |
c31ffb3f NK |
1441 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1442 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1443 | pr_warn("error on getting 2nd test probe.\n"); |
02ca1521 | 1444 | warn++; |
41a7dd42 | 1445 | } else { |
c31ffb3f | 1446 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1447 | if (WARN_ON_ONCE(file == NULL)) { |
1448 | pr_warn("error on getting probe file.\n"); | |
1449 | warn++; | |
1450 | } else | |
c31ffb3f | 1451 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1452 | } |
02ca1521 | 1453 | |
c31ffb3f | 1454 | ret = traceprobe_command("-:testprobe", create_trace_kprobe); |
231e36f4 | 1455 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1456 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1457 | warn++; |
1458 | } | |
1459 | ||
c31ffb3f | 1460 | ret = traceprobe_command("-:testprobe2", create_trace_kprobe); |
231e36f4 | 1461 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1462 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1463 | warn++; |
1464 | } | |
413d37d1 | 1465 | |
231e36f4 | 1466 | end: |
c31ffb3f | 1467 | release_all_trace_kprobes(); |
231e36f4 MH |
1468 | if (warn) |
1469 | pr_cont("NG: Some tests are failed. Please check them.\n"); | |
1470 | else | |
1471 | pr_cont("OK\n"); | |
413d37d1 MH |
1472 | return 0; |
1473 | } | |
1474 | ||
1475 | late_initcall(kprobe_trace_self_tests_init); | |
1476 | ||
1477 | #endif |