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Commit | Line | Data |
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16444a8a ACM |
1 | #ifndef _LINUX_FTRACE_H |
2 | #define _LINUX_FTRACE_H | |
3 | ||
0012693a | 4 | #include <linux/trace_clock.h> |
5601020f | 5 | #include <linux/kallsyms.h> |
0012693a | 6 | #include <linux/linkage.h> |
ea4e2bc4 | 7 | #include <linux/bitops.h> |
0012693a FW |
8 | #include <linux/module.h> |
9 | #include <linux/ktime.h> | |
21a8c466 | 10 | #include <linux/sched.h> |
0012693a FW |
11 | #include <linux/types.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/fs.h> | |
16444a8a | 14 | |
c79a61f5 UKK |
15 | #include <asm/ftrace.h> |
16 | ||
606576ce | 17 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 18 | |
b0fc494f SR |
19 | extern int ftrace_enabled; |
20 | extern int | |
21 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
22 | struct file *filp, void __user *buffer, size_t *lenp, | |
23 | loff_t *ppos); | |
24 | ||
16444a8a ACM |
25 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip); |
26 | ||
27 | struct ftrace_ops { | |
28 | ftrace_func_t func; | |
29 | struct ftrace_ops *next; | |
30 | }; | |
31 | ||
60a7ecf4 SR |
32 | extern int function_trace_stop; |
33 | ||
e7d3737e FW |
34 | /* |
35 | * Type of the current tracing. | |
36 | */ | |
37 | enum ftrace_tracing_type_t { | |
38 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
39 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
40 | }; | |
41 | ||
42 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
43 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
44 | ||
60a7ecf4 SR |
45 | /** |
46 | * ftrace_stop - stop function tracer. | |
47 | * | |
48 | * A quick way to stop the function tracer. Note this an on off switch, | |
49 | * it is not something that is recursive like preempt_disable. | |
50 | * This does not disable the calling of mcount, it only stops the | |
51 | * calling of functions from mcount. | |
52 | */ | |
53 | static inline void ftrace_stop(void) | |
54 | { | |
55 | function_trace_stop = 1; | |
56 | } | |
57 | ||
58 | /** | |
59 | * ftrace_start - start the function tracer. | |
60 | * | |
61 | * This function is the inverse of ftrace_stop. This does not enable | |
62 | * the function tracing if the function tracer is disabled. This only | |
63 | * sets the function tracer flag to continue calling the functions | |
64 | * from mcount. | |
65 | */ | |
66 | static inline void ftrace_start(void) | |
67 | { | |
68 | function_trace_stop = 0; | |
69 | } | |
70 | ||
16444a8a ACM |
71 | /* |
72 | * The ftrace_ops must be a static and should also | |
73 | * be read_mostly. These functions do modify read_mostly variables | |
74 | * so use them sparely. Never free an ftrace_op or modify the | |
75 | * next pointer after it has been registered. Even after unregistering | |
76 | * it, the next pointer may still be used internally. | |
77 | */ | |
78 | int register_ftrace_function(struct ftrace_ops *ops); | |
79 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
80 | void clear_ftrace_function(void); | |
81 | ||
82 | extern void ftrace_stub(unsigned long a0, unsigned long a1); | |
16444a8a | 83 | |
606576ce | 84 | #else /* !CONFIG_FUNCTION_TRACER */ |
16444a8a ACM |
85 | # define register_ftrace_function(ops) do { } while (0) |
86 | # define unregister_ftrace_function(ops) do { } while (0) | |
87 | # define clear_ftrace_function(ops) do { } while (0) | |
81adbdc0 | 88 | static inline void ftrace_kill(void) { } |
60a7ecf4 SR |
89 | static inline void ftrace_stop(void) { } |
90 | static inline void ftrace_start(void) { } | |
606576ce | 91 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 92 | |
f38f1d2a SR |
93 | #ifdef CONFIG_STACK_TRACER |
94 | extern int stack_tracer_enabled; | |
95 | int | |
96 | stack_trace_sysctl(struct ctl_table *table, int write, | |
97 | struct file *file, void __user *buffer, size_t *lenp, | |
98 | loff_t *ppos); | |
99 | #endif | |
100 | ||
f6180773 SR |
101 | struct ftrace_func_command { |
102 | struct list_head list; | |
103 | char *name; | |
104 | int (*func)(char *func, char *cmd, | |
105 | char *params, int enable); | |
106 | }; | |
107 | ||
3d083395 | 108 | #ifdef CONFIG_DYNAMIC_FTRACE |
31e88909 | 109 | |
000ab691 SR |
110 | int ftrace_arch_code_modify_prepare(void); |
111 | int ftrace_arch_code_modify_post_process(void); | |
112 | ||
809dcf29 SR |
113 | struct seq_file; |
114 | ||
b6887d79 | 115 | struct ftrace_probe_ops { |
59df055f SR |
116 | void (*func)(unsigned long ip, |
117 | unsigned long parent_ip, | |
118 | void **data); | |
119 | int (*callback)(unsigned long ip, void **data); | |
120 | void (*free)(void **data); | |
809dcf29 SR |
121 | int (*print)(struct seq_file *m, |
122 | unsigned long ip, | |
b6887d79 | 123 | struct ftrace_probe_ops *ops, |
809dcf29 | 124 | void *data); |
59df055f SR |
125 | }; |
126 | ||
127 | extern int | |
b6887d79 | 128 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
129 | void *data); |
130 | extern void | |
b6887d79 | 131 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
132 | void *data); |
133 | extern void | |
b6887d79 SR |
134 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); |
135 | extern void unregister_ftrace_function_probe_all(char *glob); | |
59df055f | 136 | |
3c1720f0 | 137 | enum { |
37ad5084 SR |
138 | FTRACE_FL_FREE = (1 << 0), |
139 | FTRACE_FL_FAILED = (1 << 1), | |
140 | FTRACE_FL_FILTER = (1 << 2), | |
141 | FTRACE_FL_ENABLED = (1 << 3), | |
41c52c0d | 142 | FTRACE_FL_NOTRACE = (1 << 4), |
0eb96701 | 143 | FTRACE_FL_CONVERTED = (1 << 5), |
ecea656d | 144 | FTRACE_FL_FROZEN = (1 << 6), |
3c1720f0 SR |
145 | }; |
146 | ||
3d083395 | 147 | struct dyn_ftrace { |
ee000b7f LJ |
148 | union { |
149 | unsigned long ip; /* address of mcount call-site */ | |
150 | struct dyn_ftrace *freelist; | |
151 | }; | |
152 | union { | |
153 | unsigned long flags; | |
154 | struct dyn_ftrace *newlist; | |
155 | }; | |
156 | struct dyn_arch_ftrace arch; | |
3d083395 SR |
157 | }; |
158 | ||
e1c08bdd | 159 | int ftrace_force_update(void); |
77a2b37d | 160 | void ftrace_set_filter(unsigned char *buf, int len, int reset); |
e1c08bdd | 161 | |
f6180773 SR |
162 | int register_ftrace_command(struct ftrace_func_command *cmd); |
163 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
164 | ||
3d083395 | 165 | /* defined in arch */ |
3c1720f0 | 166 | extern int ftrace_ip_converted(unsigned long ip); |
d61f82d0 | 167 | extern int ftrace_dyn_arch_init(void *data); |
d61f82d0 SR |
168 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
169 | extern void ftrace_caller(void); | |
170 | extern void ftrace_call(void); | |
171 | extern void mcount_call(void); | |
f0001207 SL |
172 | |
173 | #ifndef FTRACE_ADDR | |
174 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
175 | #endif | |
fb52607a FW |
176 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
177 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
178 | extern int ftrace_enable_ftrace_graph_caller(void); |
179 | extern int ftrace_disable_ftrace_graph_caller(void); | |
180 | #else | |
181 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
182 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 183 | #endif |
ad90c0e3 | 184 | |
31e88909 | 185 | /** |
57794a9d | 186 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
187 | * @mod: module structure if called by module load initialization |
188 | * @rec: the mcount call site record | |
189 | * @addr: the address that the call site should be calling | |
190 | * | |
191 | * This is a very sensitive operation and great care needs | |
192 | * to be taken by the arch. The operation should carefully | |
193 | * read the location, check to see if what is read is indeed | |
194 | * what we expect it to be, and then on success of the compare, | |
195 | * it should write to the location. | |
196 | * | |
197 | * The code segment at @rec->ip should be a caller to @addr | |
198 | * | |
199 | * Return must be: | |
200 | * 0 on success | |
201 | * -EFAULT on error reading the location | |
202 | * -EINVAL on a failed compare of the contents | |
203 | * -EPERM on error writing to the location | |
204 | * Any other value will be considered a failure. | |
205 | */ | |
206 | extern int ftrace_make_nop(struct module *mod, | |
207 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 208 | |
593eb8a2 | 209 | /** |
31e88909 SR |
210 | * ftrace_make_call - convert a nop call site into a call to addr |
211 | * @rec: the mcount call site record | |
212 | * @addr: the address that the call site should call | |
593eb8a2 SR |
213 | * |
214 | * This is a very sensitive operation and great care needs | |
215 | * to be taken by the arch. The operation should carefully | |
216 | * read the location, check to see if what is read is indeed | |
217 | * what we expect it to be, and then on success of the compare, | |
218 | * it should write to the location. | |
219 | * | |
31e88909 SR |
220 | * The code segment at @rec->ip should be a nop |
221 | * | |
593eb8a2 SR |
222 | * Return must be: |
223 | * 0 on success | |
224 | * -EFAULT on error reading the location | |
225 | * -EINVAL on a failed compare of the contents | |
226 | * -EPERM on error writing to the location | |
227 | * Any other value will be considered a failure. | |
228 | */ | |
31e88909 SR |
229 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
230 | ||
31e88909 SR |
231 | /* May be defined in arch */ |
232 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 233 | |
ecea656d AS |
234 | extern int skip_trace(unsigned long ip); |
235 | ||
c0719e5a SR |
236 | extern void ftrace_release(void *start, unsigned long size); |
237 | ||
238 | extern void ftrace_disable_daemon(void); | |
239 | extern void ftrace_enable_daemon(void); | |
e1c08bdd | 240 | #else |
ecea656d | 241 | # define skip_trace(ip) ({ 0; }) |
aeaee8a2 IM |
242 | # define ftrace_force_update() ({ 0; }) |
243 | # define ftrace_set_filter(buf, len, reset) do { } while (0) | |
ad90c0e3 SR |
244 | # define ftrace_disable_daemon() do { } while (0) |
245 | # define ftrace_enable_daemon() do { } while (0) | |
c0719e5a | 246 | static inline void ftrace_release(void *start, unsigned long size) { } |
f6180773 SR |
247 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
248 | { | |
97d0bb8d | 249 | return -EINVAL; |
f6180773 SR |
250 | } |
251 | static inline int unregister_ftrace_command(char *cmd_name) | |
252 | { | |
97d0bb8d | 253 | return -EINVAL; |
f6180773 | 254 | } |
ecea656d | 255 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 256 | |
aeaee8a2 IM |
257 | /* totally disable ftrace - can not re-enable after this */ |
258 | void ftrace_kill(void); | |
259 | ||
f43fdad8 IM |
260 | static inline void tracer_disable(void) |
261 | { | |
606576ce | 262 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
263 | ftrace_enabled = 0; |
264 | #endif | |
265 | } | |
266 | ||
37002735 HY |
267 | /* |
268 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 269 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
270 | * disable/restore. |
271 | */ | |
9bdeb7b5 HY |
272 | static inline int __ftrace_enabled_save(void) |
273 | { | |
606576ce | 274 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
275 | int saved_ftrace_enabled = ftrace_enabled; |
276 | ftrace_enabled = 0; | |
277 | return saved_ftrace_enabled; | |
278 | #else | |
279 | return 0; | |
280 | #endif | |
281 | } | |
282 | ||
283 | static inline void __ftrace_enabled_restore(int enabled) | |
284 | { | |
606576ce | 285 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
286 | ftrace_enabled = enabled; |
287 | #endif | |
288 | } | |
289 | ||
c79a61f5 UKK |
290 | #ifndef HAVE_ARCH_CALLER_ADDR |
291 | # ifdef CONFIG_FRAME_POINTER | |
292 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
293 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
294 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
295 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
296 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
297 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
298 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) | |
299 | # else | |
300 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
301 | # define CALLER_ADDR1 0UL | |
302 | # define CALLER_ADDR2 0UL | |
303 | # define CALLER_ADDR3 0UL | |
304 | # define CALLER_ADDR4 0UL | |
305 | # define CALLER_ADDR5 0UL | |
306 | # define CALLER_ADDR6 0UL | |
307 | # endif | |
308 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ | |
352ad25a | 309 | |
81d68a96 | 310 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
311 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
312 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 SR |
313 | #else |
314 | # define time_hardirqs_on(a0, a1) do { } while (0) | |
315 | # define time_hardirqs_off(a0, a1) do { } while (0) | |
316 | #endif | |
317 | ||
6cd8a4bb | 318 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
319 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
320 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb SR |
321 | #else |
322 | # define trace_preempt_on(a0, a1) do { } while (0) | |
323 | # define trace_preempt_off(a0, a1) do { } while (0) | |
324 | #endif | |
325 | ||
68bf21aa SR |
326 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
327 | extern void ftrace_init(void); | |
31e88909 SR |
328 | extern void ftrace_init_module(struct module *mod, |
329 | unsigned long *start, unsigned long *end); | |
68bf21aa SR |
330 | #else |
331 | static inline void ftrace_init(void) { } | |
90d595fe | 332 | static inline void |
31e88909 SR |
333 | ftrace_init_module(struct module *mod, |
334 | unsigned long *start, unsigned long *end) { } | |
68bf21aa SR |
335 | #endif |
336 | ||
287b6e68 FW |
337 | /* |
338 | * Structure that defines an entry function trace. | |
339 | */ | |
340 | struct ftrace_graph_ent { | |
341 | unsigned long func; /* Current function */ | |
342 | int depth; | |
343 | }; | |
dd0e545f | 344 | |
caf4b323 FW |
345 | /* |
346 | * Structure that defines a return function trace. | |
347 | */ | |
fb52607a | 348 | struct ftrace_graph_ret { |
caf4b323 FW |
349 | unsigned long func; /* Current function */ |
350 | unsigned long long calltime; | |
351 | unsigned long long rettime; | |
0231022c FW |
352 | /* Number of functions that overran the depth limit for current task */ |
353 | unsigned long overrun; | |
287b6e68 | 354 | int depth; |
caf4b323 FW |
355 | }; |
356 | ||
fb52607a | 357 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 358 | |
712406a6 SR |
359 | /* |
360 | * Stack of return addresses for functions | |
361 | * of a thread. | |
362 | * Used in struct thread_info | |
363 | */ | |
364 | struct ftrace_ret_stack { | |
365 | unsigned long ret; | |
366 | unsigned long func; | |
367 | unsigned long long calltime; | |
368 | }; | |
369 | ||
370 | /* | |
371 | * Primary handler of a function return. | |
372 | * It relays on ftrace_return_to_handler. | |
373 | * Defined in entry_32/64.S | |
374 | */ | |
375 | extern void return_to_handler(void); | |
376 | ||
377 | extern int | |
5d1a03dc | 378 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth); |
712406a6 SR |
379 | extern void |
380 | ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret); | |
381 | ||
8b96f011 FW |
382 | /* |
383 | * Sometimes we don't want to trace a function with the function | |
384 | * graph tracer but we want them to keep traced by the usual function | |
385 | * tracer if the function graph tracer is not configured. | |
386 | */ | |
387 | #define __notrace_funcgraph notrace | |
388 | ||
bcbc4f20 FW |
389 | /* |
390 | * We want to which function is an entrypoint of a hardirq. | |
391 | * That will help us to put a signal on output. | |
392 | */ | |
393 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) | |
394 | ||
395 | /* Limits of hardirq entrypoints */ | |
396 | extern char __irqentry_text_start[]; | |
397 | extern char __irqentry_text_end[]; | |
398 | ||
f201ae23 FW |
399 | #define FTRACE_RETFUNC_DEPTH 50 |
400 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
287b6e68 FW |
401 | /* Type of the callback handlers for tracing function graph*/ |
402 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
e49dc19c | 403 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ |
287b6e68 FW |
404 | |
405 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, | |
406 | trace_func_graph_ent_t entryfunc); | |
407 | ||
14a866c5 SR |
408 | extern void ftrace_graph_stop(void); |
409 | ||
287b6e68 FW |
410 | /* The current handlers in use */ |
411 | extern trace_func_graph_ret_t ftrace_graph_return; | |
412 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 413 | |
fb52607a | 414 | extern void unregister_ftrace_graph(void); |
f201ae23 | 415 | |
fb52607a FW |
416 | extern void ftrace_graph_init_task(struct task_struct *t); |
417 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
21a8c466 FW |
418 | |
419 | static inline int task_curr_ret_stack(struct task_struct *t) | |
420 | { | |
421 | return t->curr_ret_stack; | |
422 | } | |
380c4b14 FW |
423 | |
424 | static inline void pause_graph_tracing(void) | |
425 | { | |
426 | atomic_inc(¤t->tracing_graph_pause); | |
427 | } | |
428 | ||
429 | static inline void unpause_graph_tracing(void) | |
430 | { | |
431 | atomic_dec(¤t->tracing_graph_pause); | |
432 | } | |
82f60f0b | 433 | #else |
8b96f011 FW |
434 | |
435 | #define __notrace_funcgraph | |
bcbc4f20 | 436 | #define __irq_entry |
8b96f011 | 437 | |
fb52607a FW |
438 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
439 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
21a8c466 FW |
440 | |
441 | static inline int task_curr_ret_stack(struct task_struct *tsk) | |
442 | { | |
443 | return -1; | |
444 | } | |
380c4b14 FW |
445 | |
446 | static inline void pause_graph_tracing(void) { } | |
447 | static inline void unpause_graph_tracing(void) { } | |
caf4b323 FW |
448 | #endif |
449 | ||
ea4e2bc4 SR |
450 | #ifdef CONFIG_TRACING |
451 | #include <linux/sched.h> | |
452 | ||
453 | /* flags for current->trace */ | |
454 | enum { | |
455 | TSK_TRACE_FL_TRACE_BIT = 0, | |
456 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
457 | }; | |
458 | enum { | |
459 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
460 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
461 | }; | |
462 | ||
463 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
464 | { | |
465 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
466 | } | |
467 | ||
468 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
469 | { | |
470 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
471 | } | |
472 | ||
473 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
474 | { | |
475 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
476 | } | |
477 | ||
478 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
479 | { | |
480 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
481 | } | |
482 | ||
483 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
484 | { | |
485 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
486 | } | |
487 | ||
488 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
489 | { | |
490 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
491 | } | |
492 | ||
526211bc IM |
493 | extern int ftrace_dump_on_oops; |
494 | ||
ea4e2bc4 SR |
495 | #endif /* CONFIG_TRACING */ |
496 | ||
b1818748 MM |
497 | |
498 | #ifdef CONFIG_HW_BRANCH_TRACER | |
499 | ||
500 | void trace_hw_branch(u64 from, u64 to); | |
501 | void trace_hw_branch_oops(void); | |
502 | ||
503 | #else /* CONFIG_HW_BRANCH_TRACER */ | |
504 | ||
505 | static inline void trace_hw_branch(u64 from, u64 to) {} | |
506 | static inline void trace_hw_branch_oops(void) {} | |
507 | ||
508 | #endif /* CONFIG_HW_BRANCH_TRACER */ | |
509 | ||
ee08c6ec FW |
510 | /* |
511 | * A syscall entry in the ftrace syscalls array. | |
512 | * | |
bed1ffca FW |
513 | * @name: name of the syscall |
514 | * @nb_args: number of parameters it takes | |
515 | * @types: list of types as strings | |
516 | * @args: list of args as strings (args[i] matches types[i]) | |
ee08c6ec | 517 | */ |
bed1ffca FW |
518 | struct syscall_metadata { |
519 | const char *name; | |
520 | int nb_args; | |
521 | const char **types; | |
522 | const char **args; | |
ee08c6ec FW |
523 | }; |
524 | ||
525 | #ifdef CONFIG_FTRACE_SYSCALLS | |
bed1ffca FW |
526 | extern void arch_init_ftrace_syscalls(void); |
527 | extern struct syscall_metadata *syscall_nr_to_meta(int nr); | |
ee08c6ec FW |
528 | extern void start_ftrace_syscalls(void); |
529 | extern void stop_ftrace_syscalls(void); | |
530 | extern void ftrace_syscall_enter(struct pt_regs *regs); | |
531 | extern void ftrace_syscall_exit(struct pt_regs *regs); | |
532 | #else | |
533 | static inline void start_ftrace_syscalls(void) { } | |
534 | static inline void stop_ftrace_syscalls(void) { } | |
535 | static inline void ftrace_syscall_enter(struct pt_regs *regs) { } | |
536 | static inline void ftrace_syscall_exit(struct pt_regs *regs) { } | |
537 | #endif | |
538 | ||
16444a8a | 539 | #endif /* _LINUX_FTRACE_H */ |