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Commit | Line | Data |
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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 | */ | |
72576341 | 19 | #define pr_fmt(fmt) "trace_kprobe: " fmt |
413d37d1 MH |
20 | |
21 | #include <linux/module.h> | |
22 | #include <linux/uaccess.h> | |
413d37d1 | 23 | |
8ab83f56 | 24 | #include "trace_probe.h" |
1ff511e3 | 25 | |
8ab83f56 | 26 | #define KPROBE_EVENT_SYSTEM "kprobes" |
e09c8614 | 27 | |
413d37d1 | 28 | /** |
77b44d1b | 29 | * Kprobe event core functions |
413d37d1 | 30 | */ |
c31ffb3f | 31 | struct trace_kprobe { |
413d37d1 | 32 | struct list_head list; |
4a846b44 | 33 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
a7636d9e | 34 | unsigned long __percpu *nhit; |
413d37d1 | 35 | const char *symbol; /* symbol name */ |
c31ffb3f | 36 | struct trace_probe tp; |
413d37d1 MH |
37 | }; |
38 | ||
c31ffb3f NK |
39 | #define SIZEOF_TRACE_KPROBE(n) \ |
40 | (offsetof(struct trace_kprobe, tp.args) + \ | |
eca0d916 | 41 | (sizeof(struct probe_arg) * (n))) |
a82378d8 | 42 | |
93ccae7a | 43 | |
3da0f180 | 44 | static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk) |
413d37d1 | 45 | { |
c31ffb3f | 46 | return tk->rp.handler != NULL; |
413d37d1 MH |
47 | } |
48 | ||
3da0f180 | 49 | static nokprobe_inline const char *trace_kprobe_symbol(struct trace_kprobe *tk) |
413d37d1 | 50 | { |
c31ffb3f | 51 | return tk->symbol ? tk->symbol : "unknown"; |
413d37d1 MH |
52 | } |
53 | ||
3da0f180 | 54 | static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk) |
61424318 | 55 | { |
c31ffb3f | 56 | return tk->rp.kp.offset; |
61424318 MH |
57 | } |
58 | ||
3da0f180 | 59 | static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk) |
61424318 | 60 | { |
c31ffb3f | 61 | return !!(kprobe_gone(&tk->rp.kp)); |
61424318 MH |
62 | } |
63 | ||
3da0f180 | 64 | static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk, |
c31ffb3f | 65 | struct module *mod) |
61424318 MH |
66 | { |
67 | int len = strlen(mod->name); | |
c31ffb3f | 68 | const char *name = trace_kprobe_symbol(tk); |
61424318 MH |
69 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
70 | } | |
71 | ||
3da0f180 | 72 | static nokprobe_inline bool trace_kprobe_is_on_module(struct trace_kprobe *tk) |
61424318 | 73 | { |
c31ffb3f | 74 | return !!strchr(trace_kprobe_symbol(tk), ':'); |
61424318 MH |
75 | } |
76 | ||
f18f97ac MN |
77 | static nokprobe_inline unsigned long trace_kprobe_nhit(struct trace_kprobe *tk) |
78 | { | |
79 | unsigned long nhit = 0; | |
80 | int cpu; | |
81 | ||
82 | for_each_possible_cpu(cpu) | |
83 | nhit += *per_cpu_ptr(tk->nhit, cpu); | |
84 | ||
85 | return nhit; | |
86 | } | |
87 | ||
c31ffb3f NK |
88 | static int register_kprobe_event(struct trace_kprobe *tk); |
89 | static int unregister_kprobe_event(struct trace_kprobe *tk); | |
413d37d1 MH |
90 | |
91 | static DEFINE_MUTEX(probe_lock); | |
92 | static LIST_HEAD(probe_list); | |
93 | ||
50d78056 MH |
94 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
95 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, | |
96 | struct pt_regs *regs); | |
97 | ||
1301a44e NK |
98 | /* Memory fetching by symbol */ |
99 | struct symbol_cache { | |
100 | char *symbol; | |
101 | long offset; | |
102 | unsigned long addr; | |
103 | }; | |
104 | ||
105 | unsigned long update_symbol_cache(struct symbol_cache *sc) | |
106 | { | |
107 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); | |
108 | ||
109 | if (sc->addr) | |
110 | sc->addr += sc->offset; | |
111 | ||
112 | return sc->addr; | |
113 | } | |
114 | ||
115 | void free_symbol_cache(struct symbol_cache *sc) | |
116 | { | |
117 | kfree(sc->symbol); | |
118 | kfree(sc); | |
119 | } | |
120 | ||
121 | struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) | |
122 | { | |
123 | struct symbol_cache *sc; | |
124 | ||
125 | if (!sym || strlen(sym) == 0) | |
126 | return NULL; | |
127 | ||
128 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); | |
129 | if (!sc) | |
130 | return NULL; | |
131 | ||
132 | sc->symbol = kstrdup(sym, GFP_KERNEL); | |
133 | if (!sc->symbol) { | |
134 | kfree(sc); | |
135 | return NULL; | |
136 | } | |
137 | sc->offset = offset; | |
138 | update_symbol_cache(sc); | |
139 | ||
140 | return sc; | |
141 | } | |
142 | ||
3fd996a2 NK |
143 | /* |
144 | * Kprobes-specific fetch functions | |
145 | */ | |
146 | #define DEFINE_FETCH_stack(type) \ | |
3da0f180 | 147 | static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs, \ |
3fd996a2 NK |
148 | void *offset, void *dest) \ |
149 | { \ | |
150 | *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \ | |
151 | (unsigned int)((unsigned long)offset)); \ | |
3da0f180 MH |
152 | } \ |
153 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(stack, type)); | |
154 | ||
3fd996a2 NK |
155 | DEFINE_BASIC_FETCH_FUNCS(stack) |
156 | /* No string on the stack entry */ | |
157 | #define fetch_stack_string NULL | |
158 | #define fetch_stack_string_size NULL | |
159 | ||
5baaa59e | 160 | #define DEFINE_FETCH_memory(type) \ |
3da0f180 | 161 | static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs, \ |
5baaa59e NK |
162 | void *addr, void *dest) \ |
163 | { \ | |
164 | type retval; \ | |
165 | if (probe_kernel_address(addr, retval)) \ | |
166 | *(type *)dest = 0; \ | |
167 | else \ | |
168 | *(type *)dest = retval; \ | |
3da0f180 MH |
169 | } \ |
170 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, type)); | |
171 | ||
5baaa59e NK |
172 | DEFINE_BASIC_FETCH_FUNCS(memory) |
173 | /* | |
174 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
175 | * length and relative data location. | |
176 | */ | |
3da0f180 MH |
177 | static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, |
178 | void *addr, void *dest) | |
5baaa59e | 179 | { |
5baaa59e NK |
180 | int maxlen = get_rloc_len(*(u32 *)dest); |
181 | u8 *dst = get_rloc_data(dest); | |
1a6877b9 | 182 | long ret; |
5baaa59e NK |
183 | |
184 | if (!maxlen) | |
185 | return; | |
186 | ||
187 | /* | |
188 | * Try to get string again, since the string can be changed while | |
189 | * probing. | |
190 | */ | |
1a6877b9 | 191 | ret = strncpy_from_unsafe(dst, addr, maxlen); |
5baaa59e NK |
192 | |
193 | if (ret < 0) { /* Failed to fetch string */ | |
1a6877b9 | 194 | dst[0] = '\0'; |
5baaa59e NK |
195 | *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest)); |
196 | } else { | |
1a6877b9 | 197 | *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(*(u32 *)dest)); |
5baaa59e NK |
198 | } |
199 | } | |
3da0f180 | 200 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string)); |
5baaa59e NK |
201 | |
202 | /* Return the length of string -- including null terminal byte */ | |
3da0f180 MH |
203 | static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, |
204 | void *addr, void *dest) | |
5baaa59e NK |
205 | { |
206 | mm_segment_t old_fs; | |
207 | int ret, len = 0; | |
208 | u8 c; | |
209 | ||
210 | old_fs = get_fs(); | |
211 | set_fs(KERNEL_DS); | |
212 | pagefault_disable(); | |
213 | ||
214 | do { | |
215 | ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1); | |
216 | len++; | |
217 | } while (c && ret == 0 && len < MAX_STRING_SIZE); | |
218 | ||
219 | pagefault_enable(); | |
220 | set_fs(old_fs); | |
221 | ||
222 | if (ret < 0) /* Failed to check the length */ | |
223 | *(u32 *)dest = 0; | |
224 | else | |
225 | *(u32 *)dest = len; | |
226 | } | |
3da0f180 | 227 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string_size)); |
5baaa59e | 228 | |
1301a44e | 229 | #define DEFINE_FETCH_symbol(type) \ |
3da0f180 | 230 | void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, void *data, void *dest)\ |
1301a44e NK |
231 | { \ |
232 | struct symbol_cache *sc = data; \ | |
233 | if (sc->addr) \ | |
234 | fetch_memory_##type(regs, (void *)sc->addr, dest); \ | |
235 | else \ | |
236 | *(type *)dest = 0; \ | |
3da0f180 MH |
237 | } \ |
238 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(symbol, type)); | |
239 | ||
1301a44e NK |
240 | DEFINE_BASIC_FETCH_FUNCS(symbol) |
241 | DEFINE_FETCH_symbol(string) | |
242 | DEFINE_FETCH_symbol(string_size) | |
243 | ||
b7e0bf34 NK |
244 | /* kprobes don't support file_offset fetch methods */ |
245 | #define fetch_file_offset_u8 NULL | |
246 | #define fetch_file_offset_u16 NULL | |
247 | #define fetch_file_offset_u32 NULL | |
248 | #define fetch_file_offset_u64 NULL | |
249 | #define fetch_file_offset_string NULL | |
250 | #define fetch_file_offset_string_size NULL | |
251 | ||
34fee3a1 | 252 | /* Fetch type information table */ |
d9a16d3a | 253 | static const struct fetch_type kprobes_fetch_type_table[] = { |
34fee3a1 NK |
254 | /* Special types */ |
255 | [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, | |
256 | sizeof(u32), 1, "__data_loc char[]"), | |
257 | [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, | |
258 | string_size, sizeof(u32), 0, "u32"), | |
259 | /* Basic types */ | |
260 | ASSIGN_FETCH_TYPE(u8, u8, 0), | |
261 | ASSIGN_FETCH_TYPE(u16, u16, 0), | |
262 | ASSIGN_FETCH_TYPE(u32, u32, 0), | |
263 | ASSIGN_FETCH_TYPE(u64, u64, 0), | |
264 | ASSIGN_FETCH_TYPE(s8, u8, 1), | |
265 | ASSIGN_FETCH_TYPE(s16, u16, 1), | |
266 | ASSIGN_FETCH_TYPE(s32, u32, 1), | |
267 | ASSIGN_FETCH_TYPE(s64, u64, 1), | |
17ce3dc7 MH |
268 | ASSIGN_FETCH_TYPE_ALIAS(x8, u8, u8, 0), |
269 | ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0), | |
270 | ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0), | |
271 | ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0), | |
34fee3a1 NK |
272 | |
273 | ASSIGN_FETCH_TYPE_END | |
274 | }; | |
275 | ||
4a846b44 MH |
276 | /* |
277 | * Allocate new trace_probe and initialize it (including kprobes). | |
278 | */ | |
c31ffb3f | 279 | static struct trace_kprobe *alloc_trace_kprobe(const char *group, |
f52487e9 | 280 | const char *event, |
4a846b44 MH |
281 | void *addr, |
282 | const char *symbol, | |
283 | unsigned long offs, | |
3a6b7666 | 284 | int nargs, bool is_return) |
413d37d1 | 285 | { |
c31ffb3f | 286 | struct trace_kprobe *tk; |
6f3cf440 | 287 | int ret = -ENOMEM; |
413d37d1 | 288 | |
c31ffb3f NK |
289 | tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL); |
290 | if (!tk) | |
6f3cf440 | 291 | return ERR_PTR(ret); |
413d37d1 | 292 | |
a7636d9e MKL |
293 | tk->nhit = alloc_percpu(unsigned long); |
294 | if (!tk->nhit) | |
295 | goto error; | |
296 | ||
413d37d1 | 297 | if (symbol) { |
c31ffb3f NK |
298 | tk->symbol = kstrdup(symbol, GFP_KERNEL); |
299 | if (!tk->symbol) | |
413d37d1 | 300 | goto error; |
c31ffb3f NK |
301 | tk->rp.kp.symbol_name = tk->symbol; |
302 | tk->rp.kp.offset = offs; | |
4a846b44 | 303 | } else |
c31ffb3f | 304 | tk->rp.kp.addr = addr; |
4a846b44 MH |
305 | |
306 | if (is_return) | |
c31ffb3f | 307 | tk->rp.handler = kretprobe_dispatcher; |
4a846b44 | 308 | else |
c31ffb3f | 309 | tk->rp.kp.pre_handler = kprobe_dispatcher; |
4a846b44 | 310 | |
da34634f | 311 | if (!event || !is_good_name(event)) { |
6f3cf440 | 312 | ret = -EINVAL; |
4263565d | 313 | goto error; |
6f3cf440 MH |
314 | } |
315 | ||
c31ffb3f NK |
316 | tk->tp.call.class = &tk->tp.class; |
317 | tk->tp.call.name = kstrdup(event, GFP_KERNEL); | |
318 | if (!tk->tp.call.name) | |
4263565d | 319 | goto error; |
413d37d1 | 320 | |
da34634f | 321 | if (!group || !is_good_name(group)) { |
6f3cf440 | 322 | ret = -EINVAL; |
f52487e9 | 323 | goto error; |
6f3cf440 MH |
324 | } |
325 | ||
c31ffb3f NK |
326 | tk->tp.class.system = kstrdup(group, GFP_KERNEL); |
327 | if (!tk->tp.class.system) | |
f52487e9 MH |
328 | goto error; |
329 | ||
c31ffb3f NK |
330 | INIT_LIST_HEAD(&tk->list); |
331 | INIT_LIST_HEAD(&tk->tp.files); | |
332 | return tk; | |
413d37d1 | 333 | error: |
c31ffb3f NK |
334 | kfree(tk->tp.call.name); |
335 | kfree(tk->symbol); | |
a7636d9e | 336 | free_percpu(tk->nhit); |
c31ffb3f | 337 | kfree(tk); |
6f3cf440 | 338 | return ERR_PTR(ret); |
413d37d1 MH |
339 | } |
340 | ||
c31ffb3f | 341 | static void free_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 MH |
342 | { |
343 | int i; | |
344 | ||
c31ffb3f NK |
345 | for (i = 0; i < tk->tp.nr_args; i++) |
346 | traceprobe_free_probe_arg(&tk->tp.args[i]); | |
413d37d1 | 347 | |
c31ffb3f NK |
348 | kfree(tk->tp.call.class->system); |
349 | kfree(tk->tp.call.name); | |
350 | kfree(tk->symbol); | |
a7636d9e | 351 | free_percpu(tk->nhit); |
c31ffb3f | 352 | kfree(tk); |
413d37d1 MH |
353 | } |
354 | ||
c31ffb3f NK |
355 | static struct trace_kprobe *find_trace_kprobe(const char *event, |
356 | const char *group) | |
413d37d1 | 357 | { |
c31ffb3f | 358 | struct trace_kprobe *tk; |
413d37d1 | 359 | |
c31ffb3f | 360 | list_for_each_entry(tk, &probe_list, list) |
687fcc4a | 361 | if (strcmp(trace_event_name(&tk->tp.call), event) == 0 && |
c31ffb3f NK |
362 | strcmp(tk->tp.call.class->system, group) == 0) |
363 | return tk; | |
413d37d1 MH |
364 | return NULL; |
365 | } | |
366 | ||
41a7dd42 MH |
367 | /* |
368 | * Enable trace_probe | |
369 | * if the file is NULL, enable "perf" handler, or enable "trace" handler. | |
370 | */ | |
371 | static int | |
7f1d2f82 | 372 | enable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) |
1538f888 MH |
373 | { |
374 | int ret = 0; | |
375 | ||
41a7dd42 | 376 | if (file) { |
b04d52e3 ON |
377 | struct event_file_link *link; |
378 | ||
379 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
380 | if (!link) { | |
41a7dd42 | 381 | ret = -ENOMEM; |
3fe3d619 | 382 | goto out; |
41a7dd42 | 383 | } |
41a7dd42 | 384 | |
b04d52e3 | 385 | link->file = file; |
c31ffb3f | 386 | list_add_tail_rcu(&link->list, &tk->tp.files); |
41a7dd42 | 387 | |
c31ffb3f | 388 | tk->tp.flags |= TP_FLAG_TRACE; |
41a7dd42 | 389 | } else |
c31ffb3f | 390 | tk->tp.flags |= TP_FLAG_PROFILE; |
41a7dd42 | 391 | |
c31ffb3f NK |
392 | if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) { |
393 | if (trace_kprobe_is_return(tk)) | |
394 | ret = enable_kretprobe(&tk->rp); | |
1538f888 | 395 | else |
c31ffb3f | 396 | ret = enable_kprobe(&tk->rp.kp); |
1538f888 | 397 | } |
3fe3d619 | 398 | out: |
1538f888 MH |
399 | return ret; |
400 | } | |
401 | ||
41a7dd42 MH |
402 | /* |
403 | * Disable trace_probe | |
404 | * if the file is NULL, disable "perf" handler, or disable "trace" handler. | |
405 | */ | |
406 | static int | |
7f1d2f82 | 407 | disable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) |
1538f888 | 408 | { |
a232e270 MH |
409 | struct event_file_link *link = NULL; |
410 | int wait = 0; | |
41a7dd42 MH |
411 | int ret = 0; |
412 | ||
41a7dd42 | 413 | if (file) { |
c31ffb3f | 414 | link = find_event_file_link(&tk->tp, file); |
b04d52e3 | 415 | if (!link) { |
41a7dd42 | 416 | ret = -EINVAL; |
3fe3d619 | 417 | goto out; |
41a7dd42 MH |
418 | } |
419 | ||
b04d52e3 | 420 | list_del_rcu(&link->list); |
a232e270 | 421 | wait = 1; |
c31ffb3f | 422 | if (!list_empty(&tk->tp.files)) |
b04d52e3 | 423 | goto out; |
41a7dd42 | 424 | |
c31ffb3f | 425 | tk->tp.flags &= ~TP_FLAG_TRACE; |
41a7dd42 | 426 | } else |
c31ffb3f | 427 | tk->tp.flags &= ~TP_FLAG_PROFILE; |
41a7dd42 | 428 | |
c31ffb3f NK |
429 | if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) { |
430 | if (trace_kprobe_is_return(tk)) | |
431 | disable_kretprobe(&tk->rp); | |
1538f888 | 432 | else |
c31ffb3f | 433 | disable_kprobe(&tk->rp.kp); |
a232e270 | 434 | wait = 1; |
1538f888 | 435 | } |
3fe3d619 | 436 | out: |
a232e270 MH |
437 | if (wait) { |
438 | /* | |
439 | * Synchronize with kprobe_trace_func/kretprobe_trace_func | |
440 | * to ensure disabled (all running handlers are finished). | |
441 | * This is not only for kfree(), but also the caller, | |
442 | * trace_remove_event_call() supposes it for releasing | |
443 | * event_call related objects, which will be accessed in | |
444 | * the kprobe_trace_func/kretprobe_trace_func. | |
445 | */ | |
446 | synchronize_sched(); | |
447 | kfree(link); /* Ignored if link == NULL */ | |
448 | } | |
449 | ||
41a7dd42 | 450 | return ret; |
1538f888 MH |
451 | } |
452 | ||
61424318 | 453 | /* Internal register function - just handle k*probes and flags */ |
c31ffb3f | 454 | static int __register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 455 | { |
7f6878a3 | 456 | int i, ret; |
61424318 | 457 | |
c31ffb3f | 458 | if (trace_probe_is_registered(&tk->tp)) |
61424318 MH |
459 | return -EINVAL; |
460 | ||
c31ffb3f NK |
461 | for (i = 0; i < tk->tp.nr_args; i++) |
462 | traceprobe_update_arg(&tk->tp.args[i]); | |
7f6878a3 | 463 | |
61424318 | 464 | /* Set/clear disabled flag according to tp->flag */ |
c31ffb3f NK |
465 | if (trace_probe_is_enabled(&tk->tp)) |
466 | tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; | |
61424318 | 467 | else |
c31ffb3f | 468 | tk->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
61424318 | 469 | |
c31ffb3f NK |
470 | if (trace_kprobe_is_return(tk)) |
471 | ret = register_kretprobe(&tk->rp); | |
413d37d1 | 472 | else |
c31ffb3f | 473 | ret = register_kprobe(&tk->rp.kp); |
61424318 MH |
474 | |
475 | if (ret == 0) | |
c31ffb3f | 476 | tk->tp.flags |= TP_FLAG_REGISTERED; |
61424318 | 477 | else { |
a395d6a7 JP |
478 | pr_warn("Could not insert probe at %s+%lu: %d\n", |
479 | trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret); | |
c31ffb3f | 480 | if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) { |
a395d6a7 | 481 | pr_warn("This probe might be able to register after target module is loaded. Continue.\n"); |
61424318 MH |
482 | ret = 0; |
483 | } else if (ret == -EILSEQ) { | |
a395d6a7 JP |
484 | pr_warn("Probing address(0x%p) is not an instruction boundary.\n", |
485 | tk->rp.kp.addr); | |
61424318 MH |
486 | ret = -EINVAL; |
487 | } | |
488 | } | |
489 | ||
490 | return ret; | |
491 | } | |
492 | ||
493 | /* Internal unregister function - just handle k*probes and flags */ | |
c31ffb3f | 494 | static void __unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 495 | { |
c31ffb3f NK |
496 | if (trace_probe_is_registered(&tk->tp)) { |
497 | if (trace_kprobe_is_return(tk)) | |
498 | unregister_kretprobe(&tk->rp); | |
61424318 | 499 | else |
c31ffb3f NK |
500 | unregister_kprobe(&tk->rp.kp); |
501 | tk->tp.flags &= ~TP_FLAG_REGISTERED; | |
61424318 | 502 | /* Cleanup kprobe for reuse */ |
c31ffb3f NK |
503 | if (tk->rp.kp.symbol_name) |
504 | tk->rp.kp.addr = NULL; | |
61424318 MH |
505 | } |
506 | } | |
507 | ||
508 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ | |
c31ffb3f | 509 | static int unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 510 | { |
02ca1521 | 511 | /* Enabled event can not be unregistered */ |
c31ffb3f | 512 | if (trace_probe_is_enabled(&tk->tp)) |
02ca1521 MH |
513 | return -EBUSY; |
514 | ||
40c32592 | 515 | /* Will fail if probe is being used by ftrace or perf */ |
c31ffb3f | 516 | if (unregister_kprobe_event(tk)) |
40c32592 SRRH |
517 | return -EBUSY; |
518 | ||
c31ffb3f NK |
519 | __unregister_trace_kprobe(tk); |
520 | list_del(&tk->list); | |
02ca1521 MH |
521 | |
522 | return 0; | |
413d37d1 MH |
523 | } |
524 | ||
525 | /* Register a trace_probe and probe_event */ | |
c31ffb3f | 526 | static int register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 527 | { |
c31ffb3f | 528 | struct trace_kprobe *old_tk; |
413d37d1 MH |
529 | int ret; |
530 | ||
531 | mutex_lock(&probe_lock); | |
532 | ||
61424318 | 533 | /* Delete old (same name) event if exist */ |
687fcc4a | 534 | old_tk = find_trace_kprobe(trace_event_name(&tk->tp.call), |
de7b2973 | 535 | tk->tp.call.class->system); |
c31ffb3f NK |
536 | if (old_tk) { |
537 | ret = unregister_trace_kprobe(old_tk); | |
02ca1521 MH |
538 | if (ret < 0) |
539 | goto end; | |
c31ffb3f | 540 | free_trace_kprobe(old_tk); |
2d5e067e | 541 | } |
61424318 MH |
542 | |
543 | /* Register new event */ | |
c31ffb3f | 544 | ret = register_kprobe_event(tk); |
2d5e067e | 545 | if (ret) { |
a395d6a7 | 546 | pr_warn("Failed to register probe event(%d)\n", ret); |
2d5e067e MH |
547 | goto end; |
548 | } | |
549 | ||
61424318 | 550 | /* Register k*probe */ |
c31ffb3f | 551 | ret = __register_trace_kprobe(tk); |
61424318 | 552 | if (ret < 0) |
c31ffb3f | 553 | unregister_kprobe_event(tk); |
61424318 | 554 | else |
c31ffb3f | 555 | list_add_tail(&tk->list, &probe_list); |
61424318 | 556 | |
413d37d1 MH |
557 | end: |
558 | mutex_unlock(&probe_lock); | |
559 | return ret; | |
560 | } | |
561 | ||
61424318 | 562 | /* Module notifier call back, checking event on the module */ |
c31ffb3f | 563 | static int trace_kprobe_module_callback(struct notifier_block *nb, |
61424318 MH |
564 | unsigned long val, void *data) |
565 | { | |
566 | struct module *mod = data; | |
c31ffb3f | 567 | struct trace_kprobe *tk; |
61424318 MH |
568 | int ret; |
569 | ||
570 | if (val != MODULE_STATE_COMING) | |
571 | return NOTIFY_DONE; | |
572 | ||
573 | /* Update probes on coming module */ | |
574 | mutex_lock(&probe_lock); | |
c31ffb3f NK |
575 | list_for_each_entry(tk, &probe_list, list) { |
576 | if (trace_kprobe_within_module(tk, mod)) { | |
02ca1521 | 577 | /* Don't need to check busy - this should have gone. */ |
c31ffb3f NK |
578 | __unregister_trace_kprobe(tk); |
579 | ret = __register_trace_kprobe(tk); | |
61424318 | 580 | if (ret) |
a395d6a7 JP |
581 | pr_warn("Failed to re-register probe %s on %s: %d\n", |
582 | trace_event_name(&tk->tp.call), | |
583 | mod->name, ret); | |
61424318 MH |
584 | } |
585 | } | |
586 | mutex_unlock(&probe_lock); | |
587 | ||
588 | return NOTIFY_DONE; | |
589 | } | |
590 | ||
c31ffb3f NK |
591 | static struct notifier_block trace_kprobe_module_nb = { |
592 | .notifier_call = trace_kprobe_module_callback, | |
61424318 MH |
593 | .priority = 1 /* Invoked after kprobe module callback */ |
594 | }; | |
595 | ||
c31ffb3f | 596 | static int create_trace_kprobe(int argc, char **argv) |
413d37d1 MH |
597 | { |
598 | /* | |
599 | * Argument syntax: | |
61424318 MH |
600 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
601 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] | |
413d37d1 | 602 | * Fetch args: |
2e06ff63 MH |
603 | * $retval : fetch return value |
604 | * $stack : fetch stack address | |
605 | * $stackN : fetch Nth of stack (N:0-) | |
35abb67d | 606 | * $comm : fetch current task comm |
413d37d1 MH |
607 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
608 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) | |
609 | * %REG : fetch register REG | |
93ccae7a | 610 | * Dereferencing memory fetch: |
413d37d1 | 611 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
eca0d916 MH |
612 | * Alias name of args: |
613 | * NAME=FETCHARG : set NAME as alias of FETCHARG. | |
93ccae7a MH |
614 | * Type of args: |
615 | * FETCHARG:TYPE : use TYPE instead of unsigned long. | |
413d37d1 | 616 | */ |
c31ffb3f | 617 | struct trace_kprobe *tk; |
413d37d1 | 618 | int i, ret = 0; |
3a6b7666 | 619 | bool is_return = false, is_delete = false; |
93ccae7a | 620 | char *symbol = NULL, *event = NULL, *group = NULL; |
da34634f | 621 | char *arg; |
2fba0c88 | 622 | unsigned long offset = 0; |
413d37d1 | 623 | void *addr = NULL; |
4a846b44 | 624 | char buf[MAX_EVENT_NAME_LEN]; |
413d37d1 | 625 | |
a7c312be | 626 | /* argc must be >= 1 */ |
413d37d1 | 627 | if (argv[0][0] == 'p') |
3a6b7666 | 628 | is_return = false; |
413d37d1 | 629 | else if (argv[0][0] == 'r') |
3a6b7666 | 630 | is_return = true; |
a7c312be | 631 | else if (argv[0][0] == '-') |
3a6b7666 | 632 | is_delete = true; |
e63cc239 | 633 | else { |
a7c312be MH |
634 | pr_info("Probe definition must be started with 'p', 'r' or" |
635 | " '-'.\n"); | |
413d37d1 | 636 | return -EINVAL; |
e63cc239 | 637 | } |
413d37d1 MH |
638 | |
639 | if (argv[0][1] == ':') { | |
640 | event = &argv[0][2]; | |
f52487e9 MH |
641 | if (strchr(event, '/')) { |
642 | group = event; | |
643 | event = strchr(group, '/') + 1; | |
644 | event[-1] = '\0'; | |
645 | if (strlen(group) == 0) { | |
a5efd925 | 646 | pr_info("Group name is not specified\n"); |
f52487e9 MH |
647 | return -EINVAL; |
648 | } | |
649 | } | |
413d37d1 | 650 | if (strlen(event) == 0) { |
a5efd925 | 651 | pr_info("Event name is not specified\n"); |
413d37d1 MH |
652 | return -EINVAL; |
653 | } | |
654 | } | |
a7c312be MH |
655 | if (!group) |
656 | group = KPROBE_EVENT_SYSTEM; | |
413d37d1 | 657 | |
a7c312be MH |
658 | if (is_delete) { |
659 | if (!event) { | |
660 | pr_info("Delete command needs an event name.\n"); | |
661 | return -EINVAL; | |
662 | } | |
9da79ab8 | 663 | mutex_lock(&probe_lock); |
c31ffb3f NK |
664 | tk = find_trace_kprobe(event, group); |
665 | if (!tk) { | |
9da79ab8 | 666 | mutex_unlock(&probe_lock); |
a7c312be MH |
667 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
668 | return -ENOENT; | |
669 | } | |
670 | /* delete an event */ | |
c31ffb3f | 671 | ret = unregister_trace_kprobe(tk); |
02ca1521 | 672 | if (ret == 0) |
c31ffb3f | 673 | free_trace_kprobe(tk); |
9da79ab8 | 674 | mutex_unlock(&probe_lock); |
02ca1521 | 675 | return ret; |
a7c312be MH |
676 | } |
677 | ||
678 | if (argc < 2) { | |
679 | pr_info("Probe point is not specified.\n"); | |
680 | return -EINVAL; | |
681 | } | |
413d37d1 | 682 | if (isdigit(argv[1][0])) { |
e63cc239 MH |
683 | if (is_return) { |
684 | pr_info("Return probe point must be a symbol.\n"); | |
413d37d1 | 685 | return -EINVAL; |
e63cc239 | 686 | } |
413d37d1 | 687 | /* an address specified */ |
bcd83ea6 | 688 | ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); |
e63cc239 MH |
689 | if (ret) { |
690 | pr_info("Failed to parse address.\n"); | |
413d37d1 | 691 | return ret; |
e63cc239 | 692 | } |
413d37d1 MH |
693 | } else { |
694 | /* a symbol specified */ | |
695 | symbol = argv[1]; | |
696 | /* TODO: support .init module functions */ | |
8ab83f56 | 697 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
e63cc239 MH |
698 | if (ret) { |
699 | pr_info("Failed to parse symbol.\n"); | |
413d37d1 | 700 | return ret; |
e63cc239 MH |
701 | } |
702 | if (offset && is_return) { | |
703 | pr_info("Return probe must be used without offset.\n"); | |
413d37d1 | 704 | return -EINVAL; |
e63cc239 | 705 | } |
413d37d1 | 706 | } |
a82378d8 | 707 | argc -= 2; argv += 2; |
413d37d1 MH |
708 | |
709 | /* setup a probe */ | |
4263565d MH |
710 | if (!event) { |
711 | /* Make a new event name */ | |
4263565d | 712 | if (symbol) |
6f3cf440 | 713 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
4263565d MH |
714 | is_return ? 'r' : 'p', symbol, offset); |
715 | else | |
6f3cf440 | 716 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
4263565d | 717 | is_return ? 'r' : 'p', addr); |
4a846b44 MH |
718 | event = buf; |
719 | } | |
c31ffb3f | 720 | tk = alloc_trace_kprobe(group, event, addr, symbol, offset, argc, |
f52487e9 | 721 | is_return); |
c31ffb3f | 722 | if (IS_ERR(tk)) { |
e63cc239 | 723 | pr_info("Failed to allocate trace_probe.(%d)\n", |
c31ffb3f NK |
724 | (int)PTR_ERR(tk)); |
725 | return PTR_ERR(tk); | |
e63cc239 | 726 | } |
413d37d1 | 727 | |
413d37d1 | 728 | /* parse arguments */ |
a82378d8 MH |
729 | ret = 0; |
730 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { | |
c31ffb3f NK |
731 | struct probe_arg *parg = &tk->tp.args[i]; |
732 | ||
61a52736 | 733 | /* Increment count for freeing args in error case */ |
c31ffb3f | 734 | tk->tp.nr_args++; |
61a52736 | 735 | |
eca0d916 MH |
736 | /* Parse argument name */ |
737 | arg = strchr(argv[i], '='); | |
aba91595 | 738 | if (arg) { |
eca0d916 | 739 | *arg++ = '\0'; |
c31ffb3f | 740 | parg->name = kstrdup(argv[i], GFP_KERNEL); |
aba91595 | 741 | } else { |
eca0d916 | 742 | arg = argv[i]; |
aba91595 MH |
743 | /* If argument name is omitted, set "argN" */ |
744 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); | |
c31ffb3f | 745 | parg->name = kstrdup(buf, GFP_KERNEL); |
aba91595 | 746 | } |
a703d946 | 747 | |
c31ffb3f | 748 | if (!parg->name) { |
aba91595 | 749 | pr_info("Failed to allocate argument[%d] name.\n", i); |
ba8665d7 | 750 | ret = -ENOMEM; |
413d37d1 MH |
751 | goto error; |
752 | } | |
da34634f | 753 | |
c31ffb3f | 754 | if (!is_good_name(parg->name)) { |
da34634f | 755 | pr_info("Invalid argument[%d] name: %s\n", |
c31ffb3f | 756 | i, parg->name); |
da34634f MH |
757 | ret = -EINVAL; |
758 | goto error; | |
759 | } | |
93ccae7a | 760 | |
c31ffb3f NK |
761 | if (traceprobe_conflict_field_name(parg->name, |
762 | tk->tp.args, i)) { | |
aba91595 | 763 | pr_info("Argument[%d] name '%s' conflicts with " |
93ccae7a MH |
764 | "another field.\n", i, argv[i]); |
765 | ret = -EINVAL; | |
766 | goto error; | |
767 | } | |
ba8665d7 MH |
768 | |
769 | /* Parse fetch argument */ | |
c31ffb3f | 770 | ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg, |
d9a16d3a SR |
771 | is_return, true, |
772 | kprobes_fetch_type_table); | |
e63cc239 | 773 | if (ret) { |
aba91595 | 774 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
413d37d1 | 775 | goto error; |
e63cc239 | 776 | } |
413d37d1 | 777 | } |
413d37d1 | 778 | |
c31ffb3f | 779 | ret = register_trace_kprobe(tk); |
413d37d1 MH |
780 | if (ret) |
781 | goto error; | |
782 | return 0; | |
783 | ||
784 | error: | |
c31ffb3f | 785 | free_trace_kprobe(tk); |
413d37d1 MH |
786 | return ret; |
787 | } | |
788 | ||
c31ffb3f | 789 | static int release_all_trace_kprobes(void) |
413d37d1 | 790 | { |
c31ffb3f | 791 | struct trace_kprobe *tk; |
02ca1521 | 792 | int ret = 0; |
413d37d1 MH |
793 | |
794 | mutex_lock(&probe_lock); | |
02ca1521 | 795 | /* Ensure no probe is in use. */ |
c31ffb3f NK |
796 | list_for_each_entry(tk, &probe_list, list) |
797 | if (trace_probe_is_enabled(&tk->tp)) { | |
02ca1521 MH |
798 | ret = -EBUSY; |
799 | goto end; | |
800 | } | |
413d37d1 MH |
801 | /* TODO: Use batch unregistration */ |
802 | while (!list_empty(&probe_list)) { | |
c31ffb3f NK |
803 | tk = list_entry(probe_list.next, struct trace_kprobe, list); |
804 | ret = unregister_trace_kprobe(tk); | |
40c32592 SRRH |
805 | if (ret) |
806 | goto end; | |
c31ffb3f | 807 | free_trace_kprobe(tk); |
413d37d1 | 808 | } |
02ca1521 MH |
809 | |
810 | end: | |
413d37d1 | 811 | mutex_unlock(&probe_lock); |
02ca1521 MH |
812 | |
813 | return ret; | |
413d37d1 MH |
814 | } |
815 | ||
413d37d1 MH |
816 | /* Probes listing interfaces */ |
817 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) | |
818 | { | |
819 | mutex_lock(&probe_lock); | |
820 | return seq_list_start(&probe_list, *pos); | |
821 | } | |
822 | ||
823 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
824 | { | |
825 | return seq_list_next(v, &probe_list, pos); | |
826 | } | |
827 | ||
828 | static void probes_seq_stop(struct seq_file *m, void *v) | |
829 | { | |
830 | mutex_unlock(&probe_lock); | |
831 | } | |
832 | ||
833 | static int probes_seq_show(struct seq_file *m, void *v) | |
834 | { | |
c31ffb3f | 835 | struct trace_kprobe *tk = v; |
93ccae7a | 836 | int i; |
413d37d1 | 837 | |
fa6f0cc7 | 838 | seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p'); |
de7b2973 | 839 | seq_printf(m, ":%s/%s", tk->tp.call.class->system, |
687fcc4a | 840 | trace_event_name(&tk->tp.call)); |
413d37d1 | 841 | |
c31ffb3f NK |
842 | if (!tk->symbol) |
843 | seq_printf(m, " 0x%p", tk->rp.kp.addr); | |
844 | else if (tk->rp.kp.offset) | |
845 | seq_printf(m, " %s+%u", trace_kprobe_symbol(tk), | |
846 | tk->rp.kp.offset); | |
413d37d1 | 847 | else |
c31ffb3f | 848 | seq_printf(m, " %s", trace_kprobe_symbol(tk)); |
413d37d1 | 849 | |
c31ffb3f NK |
850 | for (i = 0; i < tk->tp.nr_args; i++) |
851 | seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm); | |
fa6f0cc7 | 852 | seq_putc(m, '\n'); |
93ccae7a | 853 | |
413d37d1 MH |
854 | return 0; |
855 | } | |
856 | ||
857 | static const struct seq_operations probes_seq_op = { | |
858 | .start = probes_seq_start, | |
859 | .next = probes_seq_next, | |
860 | .stop = probes_seq_stop, | |
861 | .show = probes_seq_show | |
862 | }; | |
863 | ||
864 | static int probes_open(struct inode *inode, struct file *file) | |
865 | { | |
02ca1521 MH |
866 | int ret; |
867 | ||
868 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { | |
c31ffb3f | 869 | ret = release_all_trace_kprobes(); |
02ca1521 MH |
870 | if (ret < 0) |
871 | return ret; | |
872 | } | |
413d37d1 MH |
873 | |
874 | return seq_open(file, &probes_seq_op); | |
875 | } | |
876 | ||
413d37d1 MH |
877 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
878 | size_t count, loff_t *ppos) | |
879 | { | |
8ab83f56 | 880 | return traceprobe_probes_write(file, buffer, count, ppos, |
c31ffb3f | 881 | create_trace_kprobe); |
413d37d1 MH |
882 | } |
883 | ||
884 | static const struct file_operations kprobe_events_ops = { | |
885 | .owner = THIS_MODULE, | |
886 | .open = probes_open, | |
887 | .read = seq_read, | |
888 | .llseek = seq_lseek, | |
889 | .release = seq_release, | |
890 | .write = probes_write, | |
891 | }; | |
892 | ||
cd7e7bd5 MH |
893 | /* Probes profiling interfaces */ |
894 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
895 | { | |
c31ffb3f | 896 | struct trace_kprobe *tk = v; |
cd7e7bd5 | 897 | |
de7b2973 | 898 | seq_printf(m, " %-44s %15lu %15lu\n", |
f18f97ac MN |
899 | trace_event_name(&tk->tp.call), |
900 | trace_kprobe_nhit(tk), | |
c31ffb3f | 901 | tk->rp.kp.nmissed); |
cd7e7bd5 MH |
902 | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static const struct seq_operations profile_seq_op = { | |
907 | .start = probes_seq_start, | |
908 | .next = probes_seq_next, | |
909 | .stop = probes_seq_stop, | |
910 | .show = probes_profile_seq_show | |
911 | }; | |
912 | ||
913 | static int profile_open(struct inode *inode, struct file *file) | |
914 | { | |
915 | return seq_open(file, &profile_seq_op); | |
916 | } | |
917 | ||
918 | static const struct file_operations kprobe_profile_ops = { | |
919 | .owner = THIS_MODULE, | |
920 | .open = profile_open, | |
921 | .read = seq_read, | |
922 | .llseek = seq_lseek, | |
923 | .release = seq_release, | |
924 | }; | |
925 | ||
413d37d1 | 926 | /* Kprobe handler */ |
3da0f180 | 927 | static nokprobe_inline void |
c31ffb3f | 928 | __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, |
7f1d2f82 | 929 | struct trace_event_file *trace_file) |
413d37d1 | 930 | { |
93ccae7a | 931 | struct kprobe_trace_entry_head *entry; |
413d37d1 | 932 | struct ring_buffer_event *event; |
8f8ffe24 | 933 | struct ring_buffer *buffer; |
e09c8614 | 934 | int size, dsize, pc; |
413d37d1 | 935 | unsigned long irq_flags; |
2425bcb9 | 936 | struct trace_event_call *call = &tk->tp.call; |
413d37d1 | 937 | |
7f1d2f82 | 938 | WARN_ON(call != trace_file->event_call); |
41a7dd42 | 939 | |
09a5059a | 940 | if (trace_trigger_soft_disabled(trace_file)) |
13a1e4ae | 941 | return; |
b8820084 | 942 | |
413d37d1 MH |
943 | local_save_flags(irq_flags); |
944 | pc = preempt_count(); | |
945 | ||
c31ffb3f NK |
946 | dsize = __get_data_size(&tk->tp, regs); |
947 | size = sizeof(*entry) + tk->tp.size + dsize; | |
413d37d1 | 948 | |
7f1d2f82 | 949 | event = trace_event_buffer_lock_reserve(&buffer, trace_file, |
41a7dd42 MH |
950 | call->event.type, |
951 | size, irq_flags, pc); | |
413d37d1 | 952 | if (!event) |
1e12a4a7 | 953 | return; |
413d37d1 MH |
954 | |
955 | entry = ring_buffer_event_data(event); | |
c31ffb3f NK |
956 | entry->ip = (unsigned long)tk->rp.kp.addr; |
957 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); | |
413d37d1 | 958 | |
7f1d2f82 | 959 | event_trigger_unlock_commit_regs(trace_file, buffer, event, |
13a1e4ae | 960 | entry, irq_flags, pc, regs); |
413d37d1 MH |
961 | } |
962 | ||
3da0f180 | 963 | static void |
c31ffb3f | 964 | kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs) |
41a7dd42 | 965 | { |
b04d52e3 | 966 | struct event_file_link *link; |
41a7dd42 | 967 | |
c31ffb3f NK |
968 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
969 | __kprobe_trace_func(tk, regs, link->file); | |
41a7dd42 | 970 | } |
3da0f180 | 971 | NOKPROBE_SYMBOL(kprobe_trace_func); |
41a7dd42 | 972 | |
413d37d1 | 973 | /* Kretprobe handler */ |
3da0f180 | 974 | static nokprobe_inline void |
c31ffb3f | 975 | __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 | 976 | struct pt_regs *regs, |
7f1d2f82 | 977 | struct trace_event_file *trace_file) |
413d37d1 | 978 | { |
93ccae7a | 979 | struct kretprobe_trace_entry_head *entry; |
413d37d1 | 980 | struct ring_buffer_event *event; |
8f8ffe24 | 981 | struct ring_buffer *buffer; |
e09c8614 | 982 | int size, pc, dsize; |
413d37d1 | 983 | unsigned long irq_flags; |
2425bcb9 | 984 | struct trace_event_call *call = &tk->tp.call; |
413d37d1 | 985 | |
7f1d2f82 | 986 | WARN_ON(call != trace_file->event_call); |
41a7dd42 | 987 | |
09a5059a | 988 | if (trace_trigger_soft_disabled(trace_file)) |
13a1e4ae | 989 | return; |
b8820084 | 990 | |
413d37d1 MH |
991 | local_save_flags(irq_flags); |
992 | pc = preempt_count(); | |
993 | ||
c31ffb3f NK |
994 | dsize = __get_data_size(&tk->tp, regs); |
995 | size = sizeof(*entry) + tk->tp.size + dsize; | |
413d37d1 | 996 | |
7f1d2f82 | 997 | event = trace_event_buffer_lock_reserve(&buffer, trace_file, |
41a7dd42 MH |
998 | call->event.type, |
999 | size, irq_flags, pc); | |
413d37d1 | 1000 | if (!event) |
1e12a4a7 | 1001 | return; |
413d37d1 MH |
1002 | |
1003 | entry = ring_buffer_event_data(event); | |
c31ffb3f | 1004 | entry->func = (unsigned long)tk->rp.kp.addr; |
413d37d1 | 1005 | entry->ret_ip = (unsigned long)ri->ret_addr; |
c31ffb3f | 1006 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
413d37d1 | 1007 | |
7f1d2f82 | 1008 | event_trigger_unlock_commit_regs(trace_file, buffer, event, |
13a1e4ae | 1009 | entry, irq_flags, pc, regs); |
413d37d1 MH |
1010 | } |
1011 | ||
3da0f180 | 1012 | static void |
c31ffb3f | 1013 | kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 MH |
1014 | struct pt_regs *regs) |
1015 | { | |
b04d52e3 | 1016 | struct event_file_link *link; |
41a7dd42 | 1017 | |
c31ffb3f NK |
1018 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
1019 | __kretprobe_trace_func(tk, ri, regs, link->file); | |
41a7dd42 | 1020 | } |
3da0f180 | 1021 | NOKPROBE_SYMBOL(kretprobe_trace_func); |
41a7dd42 | 1022 | |
413d37d1 | 1023 | /* Event entry printers */ |
b62fdd97 | 1024 | static enum print_line_t |
a9a57763 SR |
1025 | print_kprobe_event(struct trace_iterator *iter, int flags, |
1026 | struct trace_event *event) | |
413d37d1 | 1027 | { |
93ccae7a | 1028 | struct kprobe_trace_entry_head *field; |
413d37d1 | 1029 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1030 | struct trace_probe *tp; |
93ccae7a | 1031 | u8 *data; |
413d37d1 MH |
1032 | int i; |
1033 | ||
93ccae7a | 1034 | field = (struct kprobe_trace_entry_head *)iter->ent; |
80decc70 | 1035 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1036 | |
687fcc4a | 1037 | trace_seq_printf(s, "%s: (", trace_event_name(&tp->call)); |
6e9f23d1 | 1038 | |
413d37d1 | 1039 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
85224da0 | 1040 | goto out; |
413d37d1 | 1041 | |
85224da0 | 1042 | trace_seq_putc(s, ')'); |
413d37d1 | 1043 | |
93ccae7a MH |
1044 | data = (u8 *)&field[1]; |
1045 | for (i = 0; i < tp->nr_args; i++) | |
1046 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1047 | data + tp->args[i].offset, field)) |
85224da0 | 1048 | goto out; |
413d37d1 | 1049 | |
85224da0 SRRH |
1050 | trace_seq_putc(s, '\n'); |
1051 | out: | |
1052 | return trace_handle_return(s); | |
413d37d1 MH |
1053 | } |
1054 | ||
b62fdd97 | 1055 | static enum print_line_t |
a9a57763 SR |
1056 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
1057 | struct trace_event *event) | |
413d37d1 | 1058 | { |
93ccae7a | 1059 | struct kretprobe_trace_entry_head *field; |
413d37d1 | 1060 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1061 | struct trace_probe *tp; |
93ccae7a | 1062 | u8 *data; |
413d37d1 MH |
1063 | int i; |
1064 | ||
93ccae7a | 1065 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
80decc70 | 1066 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1067 | |
687fcc4a | 1068 | trace_seq_printf(s, "%s: (", trace_event_name(&tp->call)); |
6e9f23d1 | 1069 | |
413d37d1 | 1070 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
85224da0 | 1071 | goto out; |
413d37d1 | 1072 | |
85224da0 | 1073 | trace_seq_puts(s, " <- "); |
413d37d1 MH |
1074 | |
1075 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) | |
85224da0 | 1076 | goto out; |
413d37d1 | 1077 | |
85224da0 | 1078 | trace_seq_putc(s, ')'); |
413d37d1 | 1079 | |
93ccae7a MH |
1080 | data = (u8 *)&field[1]; |
1081 | for (i = 0; i < tp->nr_args; i++) | |
1082 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1083 | data + tp->args[i].offset, field)) |
85224da0 | 1084 | goto out; |
413d37d1 | 1085 | |
85224da0 | 1086 | trace_seq_putc(s, '\n'); |
413d37d1 | 1087 | |
85224da0 SRRH |
1088 | out: |
1089 | return trace_handle_return(s); | |
413d37d1 MH |
1090 | } |
1091 | ||
413d37d1 | 1092 | |
2425bcb9 | 1093 | static int kprobe_event_define_fields(struct trace_event_call *event_call) |
413d37d1 MH |
1094 | { |
1095 | int ret, i; | |
93ccae7a | 1096 | struct kprobe_trace_entry_head field; |
c31ffb3f | 1097 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1098 | |
a703d946 | 1099 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
eca0d916 | 1100 | /* Set argument names as fields */ |
c31ffb3f NK |
1101 | for (i = 0; i < tk->tp.nr_args; i++) { |
1102 | struct probe_arg *parg = &tk->tp.args[i]; | |
1103 | ||
1104 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1105 | parg->name, | |
1106 | sizeof(field) + parg->offset, | |
1107 | parg->type->size, | |
1108 | parg->type->is_signed, | |
93ccae7a MH |
1109 | FILTER_OTHER); |
1110 | if (ret) | |
1111 | return ret; | |
1112 | } | |
413d37d1 MH |
1113 | return 0; |
1114 | } | |
1115 | ||
2425bcb9 | 1116 | static int kretprobe_event_define_fields(struct trace_event_call *event_call) |
413d37d1 MH |
1117 | { |
1118 | int ret, i; | |
93ccae7a | 1119 | struct kretprobe_trace_entry_head field; |
c31ffb3f | 1120 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1121 | |
a703d946 MH |
1122 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
1123 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); | |
eca0d916 | 1124 | /* Set argument names as fields */ |
c31ffb3f NK |
1125 | for (i = 0; i < tk->tp.nr_args; i++) { |
1126 | struct probe_arg *parg = &tk->tp.args[i]; | |
1127 | ||
1128 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1129 | parg->name, | |
1130 | sizeof(field) + parg->offset, | |
1131 | parg->type->size, | |
1132 | parg->type->is_signed, | |
93ccae7a MH |
1133 | FILTER_OTHER); |
1134 | if (ret) | |
1135 | return ret; | |
1136 | } | |
413d37d1 MH |
1137 | return 0; |
1138 | } | |
1139 | ||
07b139c8 | 1140 | #ifdef CONFIG_PERF_EVENTS |
e08d1c65 MH |
1141 | |
1142 | /* Kprobe profile handler */ | |
3da0f180 | 1143 | static void |
c31ffb3f | 1144 | kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs) |
e08d1c65 | 1145 | { |
2425bcb9 | 1146 | struct trace_event_call *call = &tk->tp.call; |
2541517c | 1147 | struct bpf_prog *prog = call->prog; |
93ccae7a | 1148 | struct kprobe_trace_entry_head *entry; |
1c024eca | 1149 | struct hlist_head *head; |
e09c8614 | 1150 | int size, __size, dsize; |
4ed7c92d | 1151 | int rctx; |
e08d1c65 | 1152 | |
2541517c AS |
1153 | if (prog && !trace_call_bpf(prog, regs)) |
1154 | return; | |
1155 | ||
288e984e ON |
1156 | head = this_cpu_ptr(call->perf_events); |
1157 | if (hlist_empty(head)) | |
1158 | return; | |
1159 | ||
c31ffb3f NK |
1160 | dsize = __get_data_size(&tk->tp, regs); |
1161 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1162 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1163 | size -= sizeof(u32); | |
ce71b9df | 1164 | |
1e1dcd93 | 1165 | entry = perf_trace_buf_alloc(size, NULL, &rctx); |
430ad5a6 | 1166 | if (!entry) |
1e12a4a7 | 1167 | return; |
a1a138d0 | 1168 | |
c31ffb3f | 1169 | entry->ip = (unsigned long)tk->rp.kp.addr; |
e09c8614 | 1170 | memset(&entry[1], 0, dsize); |
c31ffb3f | 1171 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
1e1dcd93 AS |
1172 | perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, |
1173 | head, NULL); | |
e08d1c65 | 1174 | } |
3da0f180 | 1175 | NOKPROBE_SYMBOL(kprobe_perf_func); |
e08d1c65 MH |
1176 | |
1177 | /* Kretprobe profile handler */ | |
3da0f180 | 1178 | static void |
c31ffb3f | 1179 | kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
2b106aab | 1180 | struct pt_regs *regs) |
e08d1c65 | 1181 | { |
2425bcb9 | 1182 | struct trace_event_call *call = &tk->tp.call; |
2541517c | 1183 | struct bpf_prog *prog = call->prog; |
93ccae7a | 1184 | struct kretprobe_trace_entry_head *entry; |
1c024eca | 1185 | struct hlist_head *head; |
e09c8614 | 1186 | int size, __size, dsize; |
4ed7c92d | 1187 | int rctx; |
e08d1c65 | 1188 | |
2541517c AS |
1189 | if (prog && !trace_call_bpf(prog, regs)) |
1190 | return; | |
1191 | ||
288e984e ON |
1192 | head = this_cpu_ptr(call->perf_events); |
1193 | if (hlist_empty(head)) | |
1194 | return; | |
1195 | ||
c31ffb3f NK |
1196 | dsize = __get_data_size(&tk->tp, regs); |
1197 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1198 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1199 | size -= sizeof(u32); | |
444a2a3b | 1200 | |
1e1dcd93 | 1201 | entry = perf_trace_buf_alloc(size, NULL, &rctx); |
430ad5a6 | 1202 | if (!entry) |
1e12a4a7 | 1203 | return; |
e08d1c65 | 1204 | |
c31ffb3f | 1205 | entry->func = (unsigned long)tk->rp.kp.addr; |
a1a138d0 | 1206 | entry->ret_ip = (unsigned long)ri->ret_addr; |
c31ffb3f | 1207 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
1e1dcd93 AS |
1208 | perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, |
1209 | head, NULL); | |
e08d1c65 | 1210 | } |
3da0f180 | 1211 | NOKPROBE_SYMBOL(kretprobe_perf_func); |
07b139c8 | 1212 | #endif /* CONFIG_PERF_EVENTS */ |
50d78056 | 1213 | |
3fe3d619 ON |
1214 | /* |
1215 | * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex. | |
1216 | * | |
1217 | * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe | |
1218 | * lockless, but we can't race with this __init function. | |
1219 | */ | |
2425bcb9 | 1220 | static int kprobe_register(struct trace_event_call *event, |
fbc1963d | 1221 | enum trace_reg type, void *data) |
2239291a | 1222 | { |
c31ffb3f | 1223 | struct trace_kprobe *tk = (struct trace_kprobe *)event->data; |
7f1d2f82 | 1224 | struct trace_event_file *file = data; |
1538f888 | 1225 | |
2239291a SR |
1226 | switch (type) { |
1227 | case TRACE_REG_REGISTER: | |
c31ffb3f | 1228 | return enable_trace_kprobe(tk, file); |
2239291a | 1229 | case TRACE_REG_UNREGISTER: |
c31ffb3f | 1230 | return disable_trace_kprobe(tk, file); |
2239291a SR |
1231 | |
1232 | #ifdef CONFIG_PERF_EVENTS | |
1233 | case TRACE_REG_PERF_REGISTER: | |
c31ffb3f | 1234 | return enable_trace_kprobe(tk, NULL); |
2239291a | 1235 | case TRACE_REG_PERF_UNREGISTER: |
c31ffb3f | 1236 | return disable_trace_kprobe(tk, NULL); |
ceec0b6f JO |
1237 | case TRACE_REG_PERF_OPEN: |
1238 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
1239 | case TRACE_REG_PERF_ADD: |
1240 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 1241 | return 0; |
2239291a SR |
1242 | #endif |
1243 | } | |
1244 | return 0; | |
1245 | } | |
50d78056 | 1246 | |
3da0f180 | 1247 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
50d78056 | 1248 | { |
c31ffb3f | 1249 | struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp); |
e08d1c65 | 1250 | |
a7636d9e | 1251 | raw_cpu_inc(*tk->nhit); |
48182bd2 | 1252 | |
c31ffb3f NK |
1253 | if (tk->tp.flags & TP_FLAG_TRACE) |
1254 | kprobe_trace_func(tk, regs); | |
07b139c8 | 1255 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1256 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1257 | kprobe_perf_func(tk, regs); | |
07b139c8 | 1258 | #endif |
50d78056 MH |
1259 | return 0; /* We don't tweek kernel, so just return 0 */ |
1260 | } | |
3da0f180 | 1261 | NOKPROBE_SYMBOL(kprobe_dispatcher); |
50d78056 | 1262 | |
3da0f180 MH |
1263 | static int |
1264 | kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) | |
50d78056 | 1265 | { |
c31ffb3f | 1266 | struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp); |
50d78056 | 1267 | |
a7636d9e | 1268 | raw_cpu_inc(*tk->nhit); |
48182bd2 | 1269 | |
c31ffb3f NK |
1270 | if (tk->tp.flags & TP_FLAG_TRACE) |
1271 | kretprobe_trace_func(tk, ri, regs); | |
07b139c8 | 1272 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1273 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1274 | kretprobe_perf_func(tk, ri, regs); | |
07b139c8 | 1275 | #endif |
50d78056 MH |
1276 | return 0; /* We don't tweek kernel, so just return 0 */ |
1277 | } | |
3da0f180 | 1278 | NOKPROBE_SYMBOL(kretprobe_dispatcher); |
e08d1c65 | 1279 | |
a9a57763 SR |
1280 | static struct trace_event_functions kretprobe_funcs = { |
1281 | .trace = print_kretprobe_event | |
1282 | }; | |
1283 | ||
1284 | static struct trace_event_functions kprobe_funcs = { | |
1285 | .trace = print_kprobe_event | |
1286 | }; | |
1287 | ||
c31ffb3f | 1288 | static int register_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1289 | { |
2425bcb9 | 1290 | struct trace_event_call *call = &tk->tp.call; |
413d37d1 MH |
1291 | int ret; |
1292 | ||
2425bcb9 | 1293 | /* Initialize trace_event_call */ |
ffb9f995 | 1294 | INIT_LIST_HEAD(&call->class->fields); |
c31ffb3f | 1295 | if (trace_kprobe_is_return(tk)) { |
80decc70 | 1296 | call->event.funcs = &kretprobe_funcs; |
2e33af02 | 1297 | call->class->define_fields = kretprobe_event_define_fields; |
413d37d1 | 1298 | } else { |
80decc70 | 1299 | call->event.funcs = &kprobe_funcs; |
2e33af02 | 1300 | call->class->define_fields = kprobe_event_define_fields; |
413d37d1 | 1301 | } |
5bf652aa | 1302 | if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) |
a342a028 | 1303 | return -ENOMEM; |
9023c930 | 1304 | ret = register_trace_event(&call->event); |
32c0edae | 1305 | if (!ret) { |
a342a028 | 1306 | kfree(call->print_fmt); |
ff50d991 | 1307 | return -ENODEV; |
a342a028 | 1308 | } |
72cbbc89 | 1309 | call->flags = TRACE_EVENT_FL_KPROBE; |
2239291a | 1310 | call->class->reg = kprobe_register; |
c31ffb3f | 1311 | call->data = tk; |
413d37d1 | 1312 | ret = trace_add_event_call(call); |
ff50d991 | 1313 | if (ret) { |
de7b2973 | 1314 | pr_info("Failed to register kprobe event: %s\n", |
687fcc4a | 1315 | trace_event_name(call)); |
a342a028 | 1316 | kfree(call->print_fmt); |
9023c930 | 1317 | unregister_trace_event(&call->event); |
ff50d991 | 1318 | } |
413d37d1 MH |
1319 | return ret; |
1320 | } | |
1321 | ||
c31ffb3f | 1322 | static int unregister_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1323 | { |
40c32592 SRRH |
1324 | int ret; |
1325 | ||
ff50d991 | 1326 | /* tp->event is unregistered in trace_remove_event_call() */ |
c31ffb3f | 1327 | ret = trace_remove_event_call(&tk->tp.call); |
40c32592 | 1328 | if (!ret) |
c31ffb3f | 1329 | kfree(tk->tp.call.print_fmt); |
40c32592 | 1330 | return ret; |
413d37d1 MH |
1331 | } |
1332 | ||
8434dc93 | 1333 | /* Make a tracefs interface for controlling probe points */ |
413d37d1 MH |
1334 | static __init int init_kprobe_trace(void) |
1335 | { | |
1336 | struct dentry *d_tracer; | |
1337 | struct dentry *entry; | |
413d37d1 | 1338 | |
c31ffb3f | 1339 | if (register_module_notifier(&trace_kprobe_module_nb)) |
61424318 MH |
1340 | return -EINVAL; |
1341 | ||
413d37d1 | 1342 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 1343 | if (IS_ERR(d_tracer)) |
413d37d1 MH |
1344 | return 0; |
1345 | ||
8434dc93 | 1346 | entry = tracefs_create_file("kprobe_events", 0644, d_tracer, |
413d37d1 MH |
1347 | NULL, &kprobe_events_ops); |
1348 | ||
cd7e7bd5 | 1349 | /* Event list interface */ |
413d37d1 | 1350 | if (!entry) |
a395d6a7 | 1351 | pr_warn("Could not create tracefs 'kprobe_events' entry\n"); |
cd7e7bd5 MH |
1352 | |
1353 | /* Profile interface */ | |
8434dc93 | 1354 | entry = tracefs_create_file("kprobe_profile", 0444, d_tracer, |
cd7e7bd5 MH |
1355 | NULL, &kprobe_profile_ops); |
1356 | ||
1357 | if (!entry) | |
a395d6a7 | 1358 | pr_warn("Could not create tracefs 'kprobe_profile' entry\n"); |
413d37d1 MH |
1359 | return 0; |
1360 | } | |
1361 | fs_initcall(init_kprobe_trace); | |
1362 | ||
1363 | ||
1364 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
265a5b7e SR |
1365 | /* |
1366 | * The "__used" keeps gcc from removing the function symbol | |
d4d7ccc8 MN |
1367 | * from the kallsyms table. 'noinline' makes sure that there |
1368 | * isn't an inlined version used by the test method below | |
265a5b7e | 1369 | */ |
d4d7ccc8 MN |
1370 | static __used __init noinline int |
1371 | kprobe_trace_selftest_target(int a1, int a2, int a3, int a4, int a5, int a6) | |
413d37d1 MH |
1372 | { |
1373 | return a1 + a2 + a3 + a4 + a5 + a6; | |
1374 | } | |
1375 | ||
26a346f2 | 1376 | static __init struct trace_event_file * |
c31ffb3f | 1377 | find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr) |
41a7dd42 | 1378 | { |
7f1d2f82 | 1379 | struct trace_event_file *file; |
41a7dd42 MH |
1380 | |
1381 | list_for_each_entry(file, &tr->events, list) | |
c31ffb3f | 1382 | if (file->event_call == &tk->tp.call) |
41a7dd42 MH |
1383 | return file; |
1384 | ||
1385 | return NULL; | |
1386 | } | |
1387 | ||
3fe3d619 | 1388 | /* |
c31ffb3f | 1389 | * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this |
3fe3d619 ON |
1390 | * stage, we can do this lockless. |
1391 | */ | |
413d37d1 MH |
1392 | static __init int kprobe_trace_self_tests_init(void) |
1393 | { | |
231e36f4 | 1394 | int ret, warn = 0; |
413d37d1 | 1395 | int (*target)(int, int, int, int, int, int); |
c31ffb3f | 1396 | struct trace_kprobe *tk; |
7f1d2f82 | 1397 | struct trace_event_file *file; |
413d37d1 | 1398 | |
748ec3a2 YY |
1399 | if (tracing_is_disabled()) |
1400 | return -ENODEV; | |
1401 | ||
413d37d1 MH |
1402 | target = kprobe_trace_selftest_target; |
1403 | ||
1404 | pr_info("Testing kprobe tracing: "); | |
1405 | ||
8ab83f56 SD |
1406 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
1407 | "$stack $stack0 +0($stack)", | |
c31ffb3f | 1408 | create_trace_kprobe); |
231e36f4 | 1409 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1410 | pr_warn("error on probing function entry.\n"); |
231e36f4 MH |
1411 | warn++; |
1412 | } else { | |
1413 | /* Enable trace point */ | |
c31ffb3f NK |
1414 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1415 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1416 | pr_warn("error on getting new probe.\n"); |
231e36f4 | 1417 | warn++; |
41a7dd42 | 1418 | } else { |
c31ffb3f | 1419 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1420 | if (WARN_ON_ONCE(file == NULL)) { |
1421 | pr_warn("error on getting probe file.\n"); | |
1422 | warn++; | |
1423 | } else | |
c31ffb3f | 1424 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1425 | } |
231e36f4 | 1426 | } |
413d37d1 | 1427 | |
8ab83f56 | 1428 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
c31ffb3f | 1429 | "$retval", create_trace_kprobe); |
231e36f4 | 1430 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1431 | pr_warn("error on probing function return.\n"); |
231e36f4 MH |
1432 | warn++; |
1433 | } else { | |
1434 | /* Enable trace point */ | |
c31ffb3f NK |
1435 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1436 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1437 | pr_warn("error on getting 2nd new probe.\n"); |
231e36f4 | 1438 | warn++; |
41a7dd42 | 1439 | } else { |
c31ffb3f | 1440 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1441 | if (WARN_ON_ONCE(file == NULL)) { |
1442 | pr_warn("error on getting probe file.\n"); | |
1443 | warn++; | |
1444 | } else | |
c31ffb3f | 1445 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1446 | } |
231e36f4 MH |
1447 | } |
1448 | ||
1449 | if (warn) | |
1450 | goto end; | |
413d37d1 MH |
1451 | |
1452 | ret = target(1, 2, 3, 4, 5, 6); | |
1453 | ||
d4d7ccc8 MN |
1454 | /* |
1455 | * Not expecting an error here, the check is only to prevent the | |
1456 | * optimizer from removing the call to target() as otherwise there | |
1457 | * are no side-effects and the call is never performed. | |
1458 | */ | |
1459 | if (ret != 21) | |
1460 | warn++; | |
1461 | ||
02ca1521 | 1462 | /* Disable trace points before removing it */ |
c31ffb3f NK |
1463 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1464 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1465 | pr_warn("error on getting test probe.\n"); |
02ca1521 | 1466 | warn++; |
41a7dd42 | 1467 | } else { |
d4d7ccc8 MN |
1468 | if (trace_kprobe_nhit(tk) != 1) { |
1469 | pr_warn("incorrect number of testprobe hits\n"); | |
1470 | warn++; | |
1471 | } | |
1472 | ||
c31ffb3f | 1473 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1474 | if (WARN_ON_ONCE(file == NULL)) { |
1475 | pr_warn("error on getting probe file.\n"); | |
1476 | warn++; | |
1477 | } else | |
c31ffb3f | 1478 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1479 | } |
02ca1521 | 1480 | |
c31ffb3f NK |
1481 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1482 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1483 | pr_warn("error on getting 2nd test probe.\n"); |
02ca1521 | 1484 | warn++; |
41a7dd42 | 1485 | } else { |
d4d7ccc8 MN |
1486 | if (trace_kprobe_nhit(tk) != 1) { |
1487 | pr_warn("incorrect number of testprobe2 hits\n"); | |
1488 | warn++; | |
1489 | } | |
1490 | ||
c31ffb3f | 1491 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1492 | if (WARN_ON_ONCE(file == NULL)) { |
1493 | pr_warn("error on getting probe file.\n"); | |
1494 | warn++; | |
1495 | } else | |
c31ffb3f | 1496 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1497 | } |
02ca1521 | 1498 | |
c31ffb3f | 1499 | ret = traceprobe_command("-:testprobe", create_trace_kprobe); |
231e36f4 | 1500 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1501 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1502 | warn++; |
1503 | } | |
1504 | ||
c31ffb3f | 1505 | ret = traceprobe_command("-:testprobe2", create_trace_kprobe); |
231e36f4 | 1506 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1507 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1508 | warn++; |
1509 | } | |
413d37d1 | 1510 | |
231e36f4 | 1511 | end: |
c31ffb3f | 1512 | release_all_trace_kprobes(); |
231e36f4 MH |
1513 | if (warn) |
1514 | pr_cont("NG: Some tests are failed. Please check them.\n"); | |
1515 | else | |
1516 | pr_cont("OK\n"); | |
413d37d1 MH |
1517 | return 0; |
1518 | } | |
1519 | ||
1520 | late_initcall(kprobe_trace_self_tests_init); | |
1521 | ||
1522 | #endif |