Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9849ed4d MF |
2 | /* |
3 | * Ftrace header. For implementation details beyond the random comments | |
5fb94e9c | 4 | * scattered below, see: Documentation/trace/ftrace-design.rst |
9849ed4d MF |
5 | */ |
6 | ||
16444a8a ACM |
7 | #ifndef _LINUX_FTRACE_H |
8 | #define _LINUX_FTRACE_H | |
9 | ||
0264c8c9 | 10 | #include <linux/trace_recursion.h> |
0012693a | 11 | #include <linux/trace_clock.h> |
18bfee32 | 12 | #include <linux/jump_label.h> |
5601020f | 13 | #include <linux/kallsyms.h> |
0012693a | 14 | #include <linux/linkage.h> |
ea4e2bc4 | 15 | #include <linux/bitops.h> |
a1e2e31d | 16 | #include <linux/ptrace.h> |
0012693a | 17 | #include <linux/ktime.h> |
21a8c466 | 18 | #include <linux/sched.h> |
0012693a FW |
19 | #include <linux/types.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/fs.h> | |
16444a8a | 22 | |
c79a61f5 UKK |
23 | #include <asm/ftrace.h> |
24 | ||
2f5f6ad9 SR |
25 | /* |
26 | * If the arch supports passing the variable contents of | |
27 | * function_trace_op as the third parameter back from the | |
28 | * mcount call, then the arch should define this as 1. | |
29 | */ | |
30 | #ifndef ARCH_SUPPORTS_FTRACE_OPS | |
31 | #define ARCH_SUPPORTS_FTRACE_OPS 0 | |
32 | #endif | |
33 | ||
380af29b SRG |
34 | #ifdef CONFIG_TRACING |
35 | extern void ftrace_boot_snapshot(void); | |
36 | #else | |
37 | static inline void ftrace_boot_snapshot(void) { } | |
38 | #endif | |
39 | ||
34cdd18b SRV |
40 | struct ftrace_ops; |
41 | struct ftrace_regs; | |
cbad0fb2 | 42 | struct dyn_ftrace; |
9705bc70 MR |
43 | |
44 | #ifdef CONFIG_FUNCTION_TRACER | |
ccf3672d SR |
45 | /* |
46 | * If the arch's mcount caller does not support all of ftrace's | |
47 | * features, then it must call an indirect function that | |
f2cc020d | 48 | * does. Or at least does enough to prevent any unwelcome side effects. |
34cdd18b SRV |
49 | * |
50 | * Also define the function prototype that these architectures use | |
51 | * to call the ftrace_ops_list_func(). | |
ccf3672d | 52 | */ |
7544256a | 53 | #if !ARCH_SUPPORTS_FTRACE_OPS |
ccf3672d | 54 | # define FTRACE_FORCE_LIST_FUNC 1 |
34cdd18b | 55 | void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip); |
ccf3672d SR |
56 | #else |
57 | # define FTRACE_FORCE_LIST_FUNC 0 | |
34cdd18b SRV |
58 | void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, |
59 | struct ftrace_ops *op, struct ftrace_regs *fregs); | |
ccf3672d | 60 | #endif |
cbad0fb2 MR |
61 | extern const struct ftrace_ops ftrace_nop_ops; |
62 | extern const struct ftrace_ops ftrace_list_ops; | |
63 | struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec); | |
34cdd18b | 64 | #endif /* CONFIG_FUNCTION_TRACER */ |
ccf3672d | 65 | |
5f893b26 SRRH |
66 | /* Main tracing buffer and events set up */ |
67 | #ifdef CONFIG_TRACING | |
68 | void trace_init(void); | |
e725c731 | 69 | void early_trace_init(void); |
5f893b26 SRRH |
70 | #else |
71 | static inline void trace_init(void) { } | |
e725c731 | 72 | static inline void early_trace_init(void) { } |
5f893b26 | 73 | #endif |
ccf3672d | 74 | |
de477254 | 75 | struct module; |
04da85b8 | 76 | struct ftrace_hash; |
013bf0da | 77 | struct ftrace_direct_func; |
04da85b8 | 78 | |
aba4b5c2 SRV |
79 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \ |
80 | defined(CONFIG_DYNAMIC_FTRACE) | |
81 | const char * | |
82 | ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, | |
83 | unsigned long *off, char **modname, char *sym); | |
84 | #else | |
85 | static inline const char * | |
86 | ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, | |
87 | unsigned long *off, char **modname, char *sym) | |
88 | { | |
89 | return NULL; | |
90 | } | |
fc0ea795 AH |
91 | #endif |
92 | ||
93 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
94 | int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, | |
95 | char *type, char *name, | |
96 | char *module_name, int *exported); | |
97 | #else | |
6171a031 SRV |
98 | static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, |
99 | char *type, char *name, | |
100 | char *module_name, int *exported) | |
101 | { | |
102 | return -1; | |
103 | } | |
aba4b5c2 SRV |
104 | #endif |
105 | ||
606576ce | 106 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 107 | |
b0fc494f | 108 | extern int ftrace_enabled; |
b0fc494f | 109 | |
02a474ca SRV |
110 | #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS |
111 | ||
d19ad077 SRV |
112 | struct ftrace_regs { |
113 | struct pt_regs regs; | |
114 | }; | |
02a474ca SRV |
115 | #define arch_ftrace_get_regs(fregs) (&(fregs)->regs) |
116 | ||
2860cd8a | 117 | /* |
0ef86097 MR |
118 | * ftrace_regs_set_instruction_pointer() is to be defined by the architecture |
119 | * if to allow setting of the instruction pointer from the ftrace_regs when | |
120 | * HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports live kernel patching. | |
2860cd8a | 121 | */ |
0ef86097 | 122 | #define ftrace_regs_set_instruction_pointer(fregs, ip) do { } while (0) |
02a474ca | 123 | #endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ |
d19ad077 SRV |
124 | |
125 | static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs) | |
126 | { | |
127 | if (!fregs) | |
128 | return NULL; | |
129 | ||
02a474ca | 130 | return arch_ftrace_get_regs(fregs); |
d19ad077 SRV |
131 | } |
132 | ||
94d095ff MR |
133 | /* |
134 | * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. | |
135 | * Note: this can be true even when ftrace_get_regs() cannot provide a pt_regs. | |
136 | */ | |
137 | static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs) | |
138 | { | |
139 | if (IS_ENABLED(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS)) | |
140 | return true; | |
141 | ||
142 | return ftrace_get_regs(fregs) != NULL; | |
143 | } | |
144 | ||
145 | #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS | |
146 | #define ftrace_regs_get_instruction_pointer(fregs) \ | |
147 | instruction_pointer(ftrace_get_regs(fregs)) | |
148 | #define ftrace_regs_get_argument(fregs, n) \ | |
149 | regs_get_kernel_argument(ftrace_get_regs(fregs), n) | |
150 | #define ftrace_regs_get_stack_pointer(fregs) \ | |
151 | kernel_stack_pointer(ftrace_get_regs(fregs)) | |
152 | #define ftrace_regs_return_value(fregs) \ | |
153 | regs_return_value(ftrace_get_regs(fregs)) | |
154 | #define ftrace_regs_set_return_value(fregs, ret) \ | |
155 | regs_set_return_value(ftrace_get_regs(fregs), ret) | |
156 | #define ftrace_override_function_with_return(fregs) \ | |
157 | override_function_with_return(ftrace_get_regs(fregs)) | |
158 | #define ftrace_regs_query_register_offset(name) \ | |
159 | regs_query_register_offset(name) | |
160 | #endif | |
161 | ||
2f5f6ad9 | 162 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, |
d19ad077 | 163 | struct ftrace_ops *op, struct ftrace_regs *fregs); |
16444a8a | 164 | |
87354059 SRRH |
165 | ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); |
166 | ||
e248491a JO |
167 | /* |
168 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are | |
169 | * set in the flags member. | |
a25d036d | 170 | * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION, STUB and |
f8b8be8a MH |
171 | * IPMODIFY are a kind of attribute flags which can be set only before |
172 | * registering the ftrace_ops, and can not be modified while registered. | |
ad61dd30 | 173 | * Changing those attribute flags after registering ftrace_ops will |
f8b8be8a | 174 | * cause unexpected results. |
e248491a JO |
175 | * |
176 | * ENABLED - set/unset when ftrace_ops is registered/unregistered | |
e248491a JO |
177 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically |
178 | * allocated ftrace_ops which need special care | |
08f6fba5 SR |
179 | * SAVE_REGS - The ftrace_ops wants regs saved at each function called |
180 | * and passed to the callback. If this flag is set, but the | |
181 | * architecture does not support passing regs | |
06aeaaea | 182 | * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the |
08f6fba5 SR |
183 | * ftrace_ops will fail to register, unless the next flag |
184 | * is set. | |
185 | * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the | |
186 | * handler can handle an arch that does not save regs | |
187 | * (the handler tests if regs == NULL), then it can set | |
188 | * this flag instead. It will not fail registering the ftrace_ops | |
189 | * but, the regs field will be NULL if the arch does not support | |
190 | * passing regs to the handler. | |
191 | * Note, if this flag is set, the SAVE_REGS flag will automatically | |
192 | * get set upon registering the ftrace_ops, if the arch supports it. | |
a25d036d SRV |
193 | * RECURSION - The ftrace_ops can set this to tell the ftrace infrastructure |
194 | * that the call back needs recursion protection. If it does | |
195 | * not set this, then the ftrace infrastructure will assume | |
196 | * that the callback can handle recursion on its own. | |
395b97a3 | 197 | * STUB - The ftrace_ops is just a place holder. |
f04f24fb MH |
198 | * INITIALIZED - The ftrace_ops has already been initialized (first use time |
199 | * register_ftrace_function() is called, it will initialized the ops) | |
591dffda | 200 | * DELETED - The ops are being deleted, do not let them be registered again. |
e1effa01 SRRH |
201 | * ADDING - The ops is in the process of being added. |
202 | * REMOVING - The ops is in the process of being removed. | |
203 | * MODIFYING - The ops is in the process of changing its filter functions. | |
f3bea491 SRRH |
204 | * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. |
205 | * The arch specific code sets this flag when it allocated a | |
206 | * trampoline. This lets the arch know that it can update the | |
207 | * trampoline in case the callback function changes. | |
208 | * The ftrace_ops trampoline can be set by the ftrace users, and | |
209 | * in such cases the arch must not modify it. Only the arch ftrace | |
210 | * core code should set this flag. | |
f8b8be8a MH |
211 | * IPMODIFY - The ops can modify the IP register. This can only be set with |
212 | * SAVE_REGS. If another ops with this flag set is already registered | |
213 | * for any of the functions that this ops will be registered for, then | |
214 | * this ops will fail to register or set_filter_ip. | |
e3eea140 | 215 | * PID - Is affected by set_ftrace_pid (allows filtering on those pids) |
d0ba52f1 | 216 | * RCU - Set when the ops can only be called when RCU is watching. |
8c08f0d5 | 217 | * TRACE_ARRAY - The ops->private points to a trace_array descriptor. |
7162431d MB |
218 | * PERMANENT - Set when the ops is permanent and should not be affected by |
219 | * ftrace_enabled. | |
763e34e7 SRV |
220 | * DIRECT - Used by the direct ftrace_ops helper for direct functions |
221 | * (internal ftrace only, should not be used by others) | |
e248491a | 222 | */ |
b848914c | 223 | enum { |
b41db132 EWI |
224 | FTRACE_OPS_FL_ENABLED = BIT(0), |
225 | FTRACE_OPS_FL_DYNAMIC = BIT(1), | |
226 | FTRACE_OPS_FL_SAVE_REGS = BIT(2), | |
227 | FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = BIT(3), | |
a25d036d | 228 | FTRACE_OPS_FL_RECURSION = BIT(4), |
b41db132 EWI |
229 | FTRACE_OPS_FL_STUB = BIT(5), |
230 | FTRACE_OPS_FL_INITIALIZED = BIT(6), | |
231 | FTRACE_OPS_FL_DELETED = BIT(7), | |
232 | FTRACE_OPS_FL_ADDING = BIT(8), | |
233 | FTRACE_OPS_FL_REMOVING = BIT(9), | |
234 | FTRACE_OPS_FL_MODIFYING = BIT(10), | |
235 | FTRACE_OPS_FL_ALLOC_TRAMP = BIT(11), | |
236 | FTRACE_OPS_FL_IPMODIFY = BIT(12), | |
237 | FTRACE_OPS_FL_PID = BIT(13), | |
238 | FTRACE_OPS_FL_RCU = BIT(14), | |
239 | FTRACE_OPS_FL_TRACE_ARRAY = BIT(15), | |
240 | FTRACE_OPS_FL_PERMANENT = BIT(16), | |
241 | FTRACE_OPS_FL_DIRECT = BIT(17), | |
b848914c SR |
242 | }; |
243 | ||
53cd885b SL |
244 | /* |
245 | * FTRACE_OPS_CMD_* commands allow the ftrace core logic to request changes | |
246 | * to a ftrace_ops. Note, the requests may fail. | |
247 | * | |
248 | * ENABLE_SHARE_IPMODIFY_SELF - enable a DIRECT ops to work on the same | |
249 | * function as an ops with IPMODIFY. Called | |
250 | * when the DIRECT ops is being registered. | |
251 | * This is called with both direct_mutex and | |
252 | * ftrace_lock are locked. | |
253 | * | |
254 | * ENABLE_SHARE_IPMODIFY_PEER - enable a DIRECT ops to work on the same | |
255 | * function as an ops with IPMODIFY. Called | |
256 | * when the other ops (the one with IPMODIFY) | |
257 | * is being registered. | |
258 | * This is called with direct_mutex locked. | |
259 | * | |
260 | * DISABLE_SHARE_IPMODIFY_PEER - disable a DIRECT ops to work on the same | |
261 | * function as an ops with IPMODIFY. Called | |
262 | * when the other ops (the one with IPMODIFY) | |
263 | * is being unregistered. | |
264 | * This is called with direct_mutex locked. | |
265 | */ | |
266 | enum ftrace_ops_cmd { | |
267 | FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF, | |
268 | FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER, | |
269 | FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER, | |
270 | }; | |
271 | ||
272 | /* | |
273 | * For most ftrace_ops_cmd, | |
274 | * Returns: | |
275 | * 0 - Success. | |
276 | * Negative on failure. The return value is dependent on the | |
277 | * callback. | |
278 | */ | |
279 | typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd); | |
280 | ||
33b7f99c SRRH |
281 | #ifdef CONFIG_DYNAMIC_FTRACE |
282 | /* The hash used to know what functions callbacks trace */ | |
283 | struct ftrace_ops_hash { | |
f86f4180 CZ |
284 | struct ftrace_hash __rcu *notrace_hash; |
285 | struct ftrace_hash __rcu *filter_hash; | |
33b7f99c SRRH |
286 | struct mutex regex_lock; |
287 | }; | |
42c269c8 | 288 | |
b80f0f6c | 289 | void ftrace_free_init_mem(void); |
aba4b5c2 | 290 | void ftrace_free_mem(struct module *mod, void *start, void *end); |
42c269c8 | 291 | #else |
380af29b SRG |
292 | static inline void ftrace_free_init_mem(void) |
293 | { | |
294 | ftrace_boot_snapshot(); | |
295 | } | |
aba4b5c2 | 296 | static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } |
33b7f99c SRRH |
297 | #endif |
298 | ||
b7e00a6c | 299 | /* |
ba27f2bc SRRH |
300 | * Note, ftrace_ops can be referenced outside of RCU protection, unless |
301 | * the RCU flag is set. If ftrace_ops is allocated and not part of kernel | |
302 | * core data, the unregistering of it will perform a scheduling on all CPUs | |
303 | * to make sure that there are no more users. Depending on the load of the | |
304 | * system that may take a bit of time. | |
b7e00a6c SRRH |
305 | * |
306 | * Any private data added must also take care not to be freed and if private | |
307 | * data is added to a ftrace_ops that is in core code, the user of the | |
308 | * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. | |
309 | */ | |
16444a8a | 310 | struct ftrace_ops { |
f45948e8 | 311 | ftrace_func_t func; |
f86f4180 | 312 | struct ftrace_ops __rcu *next; |
b848914c | 313 | unsigned long flags; |
b7e00a6c | 314 | void *private; |
e3eea140 | 315 | ftrace_func_t saved_func; |
f45948e8 | 316 | #ifdef CONFIG_DYNAMIC_FTRACE |
33b7f99c SRRH |
317 | struct ftrace_ops_hash local_hash; |
318 | struct ftrace_ops_hash *func_hash; | |
fef5aeee | 319 | struct ftrace_ops_hash old_hash; |
79922b80 | 320 | unsigned long trampoline; |
aec0be2d | 321 | unsigned long trampoline_size; |
fc0ea795 | 322 | struct list_head list; |
53cd885b | 323 | ftrace_ops_func_t ops_func; |
f45948e8 | 324 | #endif |
16444a8a ACM |
325 | }; |
326 | ||
59566b0b SRV |
327 | extern struct ftrace_ops __rcu *ftrace_ops_list; |
328 | extern struct ftrace_ops ftrace_list_end; | |
329 | ||
330 | /* | |
40dc4a42 | 331 | * Traverse the ftrace_ops_list, invoking all entries. The reason that we |
59566b0b SRV |
332 | * can use rcu_dereference_raw_check() is that elements removed from this list |
333 | * are simply leaked, so there is no need to interact with a grace-period | |
334 | * mechanism. The rcu_dereference_raw_check() calls are needed to handle | |
40dc4a42 | 335 | * concurrent insertions into the ftrace_ops_list. |
59566b0b SRV |
336 | * |
337 | * Silly Alpha and silly pointer-speculation compiler optimizations! | |
338 | */ | |
339 | #define do_for_each_ftrace_op(op, list) \ | |
340 | op = rcu_dereference_raw_check(list); \ | |
341 | do | |
342 | ||
343 | /* | |
344 | * Optimized for just a single item in the list (as that is the normal case). | |
345 | */ | |
346 | #define while_for_each_ftrace_op(op) \ | |
347 | while (likely(op = rcu_dereference_raw_check((op)->next)) && \ | |
348 | unlikely((op) != &ftrace_list_end)) | |
349 | ||
e7d3737e FW |
350 | /* |
351 | * Type of the current tracing. | |
352 | */ | |
353 | enum ftrace_tracing_type_t { | |
354 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
355 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
356 | }; | |
357 | ||
358 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
359 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
360 | ||
16444a8a ACM |
361 | /* |
362 | * The ftrace_ops must be a static and should also | |
363 | * be read_mostly. These functions do modify read_mostly variables | |
364 | * so use them sparely. Never free an ftrace_op or modify the | |
365 | * next pointer after it has been registered. Even after unregistering | |
366 | * it, the next pointer may still be used internally. | |
367 | */ | |
368 | int register_ftrace_function(struct ftrace_ops *ops); | |
369 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
16444a8a | 370 | |
a1e2e31d | 371 | extern void ftrace_stub(unsigned long a0, unsigned long a1, |
d19ad077 | 372 | struct ftrace_ops *op, struct ftrace_regs *fregs); |
16444a8a | 373 | |
bed0d9a5 JO |
374 | |
375 | int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs); | |
606576ce | 376 | #else /* !CONFIG_FUNCTION_TRACER */ |
4dbf6bc2 SR |
377 | /* |
378 | * (un)register_ftrace_function must be a macro since the ops parameter | |
379 | * must not be evaluated. | |
380 | */ | |
381 | #define register_ftrace_function(ops) ({ 0; }) | |
382 | #define unregister_ftrace_function(ops) ({ 0; }) | |
81adbdc0 | 383 | static inline void ftrace_kill(void) { } |
b80f0f6c | 384 | static inline void ftrace_free_init_mem(void) { } |
aba4b5c2 | 385 | static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } |
bed0d9a5 JO |
386 | static inline int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs) |
387 | { | |
388 | return -EOPNOTSUPP; | |
389 | } | |
606576ce | 390 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 391 | |
ea806eb3 SRV |
392 | struct ftrace_func_entry { |
393 | struct hlist_node hlist; | |
394 | unsigned long ip; | |
395 | unsigned long direct; /* for direct lookup only */ | |
396 | }; | |
397 | ||
763e34e7 | 398 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS |
a3ad1a7e | 399 | extern int ftrace_direct_func_count; |
ff205766 | 400 | unsigned long ftrace_find_rec_direct(unsigned long ip); |
da8bdfbd FR |
401 | int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr); |
402 | int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, | |
403 | bool free_filters); | |
404 | int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr); | |
405 | int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr); | |
ccf5a89e | 406 | |
763e34e7 | 407 | #else |
f64dd462 | 408 | struct ftrace_ops; |
a3ad1a7e | 409 | # define ftrace_direct_func_count 0 |
ff205766 AS |
410 | static inline unsigned long ftrace_find_rec_direct(unsigned long ip) |
411 | { | |
412 | return 0; | |
413 | } | |
da8bdfbd | 414 | static inline int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) |
f64dd462 JO |
415 | { |
416 | return -ENODEV; | |
417 | } | |
da8bdfbd FR |
418 | static inline int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, |
419 | bool free_filters) | |
f64dd462 JO |
420 | { |
421 | return -ENODEV; | |
422 | } | |
da8bdfbd | 423 | static inline int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) |
ccf5a89e JO |
424 | { |
425 | return -ENODEV; | |
426 | } | |
da8bdfbd | 427 | static inline int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr) |
f96f644a SL |
428 | { |
429 | return -ENODEV; | |
430 | } | |
763e34e7 | 431 | |
763e34e7 SRV |
432 | /* |
433 | * This must be implemented by the architecture. | |
434 | * It is the way the ftrace direct_ops helper, when called | |
435 | * via ftrace (because there's other callbacks besides the | |
436 | * direct call), can inform the architecture's trampoline that this | |
437 | * routine has a direct caller, and what the caller is. | |
562955fe SRV |
438 | * |
439 | * For example, in x86, it returns the direct caller | |
440 | * callback function via the regs->orig_ax parameter. | |
441 | * Then in the ftrace trampoline, if this is set, it makes | |
442 | * the return from the trampoline jump to the direct caller | |
443 | * instead of going back to the function it just traced. | |
763e34e7 | 444 | */ |
9705bc70 | 445 | static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, |
763e34e7 | 446 | unsigned long addr) { } |
9705bc70 | 447 | #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ |
763e34e7 | 448 | |
f38f1d2a | 449 | #ifdef CONFIG_STACK_TRACER |
bb99d8cc | 450 | |
f38f1d2a | 451 | extern int stack_tracer_enabled; |
3d9a8072 | 452 | |
7ff0d449 CH |
453 | int stack_trace_sysctl(struct ctl_table *table, int write, void *buffer, |
454 | size_t *lenp, loff_t *ppos); | |
5367278c | 455 | |
8aaf1ee7 SRV |
456 | /* DO NOT MODIFY THIS VARIABLE DIRECTLY! */ |
457 | DECLARE_PER_CPU(int, disable_stack_tracer); | |
458 | ||
459 | /** | |
460 | * stack_tracer_disable - temporarily disable the stack tracer | |
461 | * | |
462 | * There's a few locations (namely in RCU) where stack tracing | |
463 | * cannot be executed. This function is used to disable stack | |
464 | * tracing during those critical sections. | |
465 | * | |
466 | * This function must be called with preemption or interrupts | |
467 | * disabled and stack_tracer_enable() must be called shortly after | |
468 | * while preemption or interrupts are still disabled. | |
469 | */ | |
470 | static inline void stack_tracer_disable(void) | |
471 | { | |
f2cc020d | 472 | /* Preemption or interrupts must be disabled */ |
60361e12 | 473 | if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) |
8aaf1ee7 SRV |
474 | WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); |
475 | this_cpu_inc(disable_stack_tracer); | |
476 | } | |
477 | ||
478 | /** | |
479 | * stack_tracer_enable - re-enable the stack tracer | |
480 | * | |
481 | * After stack_tracer_disable() is called, stack_tracer_enable() | |
482 | * must be called shortly afterward. | |
483 | */ | |
484 | static inline void stack_tracer_enable(void) | |
485 | { | |
60361e12 | 486 | if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) |
8aaf1ee7 SRV |
487 | WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); |
488 | this_cpu_dec(disable_stack_tracer); | |
489 | } | |
5367278c SRV |
490 | #else |
491 | static inline void stack_tracer_disable(void) { } | |
492 | static inline void stack_tracer_enable(void) { } | |
f38f1d2a SR |
493 | #endif |
494 | ||
3d083395 | 495 | #ifdef CONFIG_DYNAMIC_FTRACE |
31e88909 | 496 | |
3a2bfec0 L |
497 | void ftrace_arch_code_modify_prepare(void); |
498 | void ftrace_arch_code_modify_post_process(void); | |
000ab691 | 499 | |
02a392a0 SRRH |
500 | enum ftrace_bug_type { |
501 | FTRACE_BUG_UNKNOWN, | |
502 | FTRACE_BUG_INIT, | |
503 | FTRACE_BUG_NOP, | |
504 | FTRACE_BUG_CALL, | |
505 | FTRACE_BUG_UPDATE, | |
506 | }; | |
507 | extern enum ftrace_bug_type ftrace_bug_type; | |
508 | ||
b05086c7 SRRH |
509 | /* |
510 | * Archs can set this to point to a variable that holds the value that was | |
511 | * expected at the call site before calling ftrace_bug(). | |
512 | */ | |
513 | extern const void *ftrace_expected; | |
514 | ||
4fd3279b | 515 | void ftrace_bug(int err, struct dyn_ftrace *rec); |
c88fd863 | 516 | |
809dcf29 SR |
517 | struct seq_file; |
518 | ||
d88471cb | 519 | extern int ftrace_text_reserved(const void *start, const void *end); |
2cfa1978 | 520 | |
6be7fa3c SRV |
521 | struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr); |
522 | ||
aec0be2d SRRH |
523 | bool is_ftrace_trampoline(unsigned long addr); |
524 | ||
08f6fba5 SR |
525 | /* |
526 | * The dyn_ftrace record's flags field is split into two parts. | |
527 | * the first part which is '0-FTRACE_REF_MAX' is a counter of | |
528 | * the number of callbacks that have registered the function that | |
529 | * the dyn_ftrace descriptor represents. | |
530 | * | |
531 | * The second part is a mask: | |
532 | * ENABLED - the function is being traced | |
533 | * REGS - the record wants the function to save regs | |
534 | * REGS_EN - the function is set up to save regs. | |
f8b8be8a | 535 | * IPMODIFY - the record allows for the IP address to be changed. |
b7ffffbb | 536 | * DISABLED - the record is not ready to be touched yet |
763e34e7 | 537 | * DIRECT - there is a direct function to call |
cbad0fb2 MR |
538 | * CALL_OPS - the record can use callsite-specific ops |
539 | * CALL_OPS_EN - the function is set up to use callsite-specific ops | |
08f6fba5 SR |
540 | * |
541 | * When a new ftrace_ops is registered and wants a function to save | |
02dae28f | 542 | * pt_regs, the rec->flags REGS is set. When the function has been |
08f6fba5 SR |
543 | * set up to save regs, the REG_EN flag is set. Once a function |
544 | * starts saving regs it will do so until all ftrace_ops are removed | |
545 | * from tracing that function. | |
546 | */ | |
3c1720f0 | 547 | enum { |
79922b80 | 548 | FTRACE_FL_ENABLED = (1UL << 31), |
08f6fba5 | 549 | FTRACE_FL_REGS = (1UL << 30), |
79922b80 SRRH |
550 | FTRACE_FL_REGS_EN = (1UL << 29), |
551 | FTRACE_FL_TRAMP = (1UL << 28), | |
552 | FTRACE_FL_TRAMP_EN = (1UL << 27), | |
f8b8be8a | 553 | FTRACE_FL_IPMODIFY = (1UL << 26), |
b7ffffbb | 554 | FTRACE_FL_DISABLED = (1UL << 25), |
763e34e7 SRV |
555 | FTRACE_FL_DIRECT = (1UL << 24), |
556 | FTRACE_FL_DIRECT_EN = (1UL << 23), | |
cbad0fb2 MR |
557 | FTRACE_FL_CALL_OPS = (1UL << 22), |
558 | FTRACE_FL_CALL_OPS_EN = (1UL << 21), | |
3c1720f0 SR |
559 | }; |
560 | ||
cbad0fb2 | 561 | #define FTRACE_REF_MAX_SHIFT 21 |
cf2cb0b2 | 562 | #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1) |
ed926f9b | 563 | |
02dae28f | 564 | #define ftrace_rec_count(rec) ((rec)->flags & FTRACE_REF_MAX) |
0376bde1 | 565 | |
3d083395 | 566 | struct dyn_ftrace { |
a762782d | 567 | unsigned long ip; /* address of mcount call-site */ |
85ae32ae | 568 | unsigned long flags; |
a762782d | 569 | struct dyn_arch_ftrace arch; |
3d083395 SR |
570 | }; |
571 | ||
647664ea MH |
572 | int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, |
573 | int remove, int reset); | |
4f554e95 JO |
574 | int ftrace_set_filter_ips(struct ftrace_ops *ops, unsigned long *ips, |
575 | unsigned int cnt, int remove, int reset); | |
ac483c44 | 576 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
936e074b | 577 | int len, int reset); |
ac483c44 | 578 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
936e074b SR |
579 | int len, int reset); |
580 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); | |
581 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); | |
5500fa51 | 582 | void ftrace_free_filter(struct ftrace_ops *ops); |
d032ae89 | 583 | void ftrace_ops_set_global_filter(struct ftrace_ops *ops); |
e1c08bdd | 584 | |
c88fd863 SR |
585 | enum { |
586 | FTRACE_UPDATE_CALLS = (1 << 0), | |
587 | FTRACE_DISABLE_CALLS = (1 << 1), | |
588 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
589 | FTRACE_START_FUNC_RET = (1 << 3), | |
590 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
a0572f68 | 591 | FTRACE_MAY_SLEEP = (1 << 5), |
c88fd863 SR |
592 | }; |
593 | ||
08f6fba5 SR |
594 | /* |
595 | * The FTRACE_UPDATE_* enum is used to pass information back | |
596 | * from the ftrace_update_record() and ftrace_test_record() | |
597 | * functions. These are called by the code update routines | |
598 | * to find out what is to be done for a given function. | |
599 | * | |
600 | * IGNORE - The function is already what we want it to be | |
601 | * MAKE_CALL - Start tracing the function | |
602 | * MODIFY_CALL - Stop saving regs for the function | |
08f6fba5 SR |
603 | * MAKE_NOP - Stop tracing the function |
604 | */ | |
c88fd863 SR |
605 | enum { |
606 | FTRACE_UPDATE_IGNORE, | |
607 | FTRACE_UPDATE_MAKE_CALL, | |
08f6fba5 | 608 | FTRACE_UPDATE_MODIFY_CALL, |
c88fd863 SR |
609 | FTRACE_UPDATE_MAKE_NOP, |
610 | }; | |
611 | ||
fc13cb0c SR |
612 | enum { |
613 | FTRACE_ITER_FILTER = (1 << 0), | |
614 | FTRACE_ITER_NOTRACE = (1 << 1), | |
615 | FTRACE_ITER_PRINTALL = (1 << 2), | |
eee8ded1 SRV |
616 | FTRACE_ITER_DO_PROBES = (1 << 3), |
617 | FTRACE_ITER_PROBE = (1 << 4), | |
5985ea8b SRV |
618 | FTRACE_ITER_MOD = (1 << 5), |
619 | FTRACE_ITER_ENABLED = (1 << 6), | |
fc13cb0c SR |
620 | }; |
621 | ||
c88fd863 | 622 | void arch_ftrace_update_code(int command); |
89f579ce YW |
623 | void arch_ftrace_update_trampoline(struct ftrace_ops *ops); |
624 | void *arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec); | |
625 | void arch_ftrace_trampoline_free(struct ftrace_ops *ops); | |
c88fd863 SR |
626 | |
627 | struct ftrace_rec_iter; | |
628 | ||
629 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
630 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
631 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
632 | ||
08d636b6 SR |
633 | #define for_ftrace_rec_iter(iter) \ |
634 | for (iter = ftrace_rec_iter_start(); \ | |
635 | iter; \ | |
636 | iter = ftrace_rec_iter_next(iter)) | |
637 | ||
638 | ||
7375dca1 SRV |
639 | int ftrace_update_record(struct dyn_ftrace *rec, bool enable); |
640 | int ftrace_test_record(struct dyn_ftrace *rec, bool enable); | |
c88fd863 | 641 | void ftrace_run_stop_machine(int command); |
f0cf973a | 642 | unsigned long ftrace_location(unsigned long ip); |
04cf31a7 | 643 | unsigned long ftrace_location_range(unsigned long start, unsigned long end); |
7413af1f SRRH |
644 | unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec); |
645 | unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec); | |
c88fd863 SR |
646 | |
647 | extern ftrace_func_t ftrace_trace_function; | |
648 | ||
fc13cb0c SR |
649 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
650 | struct inode *inode, struct file *file); | |
651 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
652 | size_t cnt, loff_t *ppos); | |
653 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
654 | size_t cnt, loff_t *ppos); | |
fc13cb0c SR |
655 | int ftrace_regex_release(struct inode *inode, struct file *file); |
656 | ||
2a85a37f SR |
657 | void __init |
658 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
659 | ||
3d083395 | 660 | /* defined in arch */ |
3c1720f0 | 661 | extern int ftrace_ip_converted(unsigned long ip); |
3a36cb11 | 662 | extern int ftrace_dyn_arch_init(void); |
e4f5d544 | 663 | extern void ftrace_replace_code(int enable); |
d61f82d0 SR |
664 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
665 | extern void ftrace_caller(void); | |
08f6fba5 | 666 | extern void ftrace_regs_caller(void); |
d61f82d0 | 667 | extern void ftrace_call(void); |
08f6fba5 | 668 | extern void ftrace_regs_call(void); |
d61f82d0 | 669 | extern void mcount_call(void); |
f0001207 | 670 | |
8ed3e2cf SR |
671 | void ftrace_modify_all_code(int command); |
672 | ||
f0001207 SL |
673 | #ifndef FTRACE_ADDR |
674 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
675 | #endif | |
08f6fba5 | 676 | |
79922b80 SRRH |
677 | #ifndef FTRACE_GRAPH_ADDR |
678 | #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller) | |
679 | #endif | |
680 | ||
08f6fba5 | 681 | #ifndef FTRACE_REGS_ADDR |
06aeaaea | 682 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
08f6fba5 SR |
683 | # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) |
684 | #else | |
685 | # define FTRACE_REGS_ADDR FTRACE_ADDR | |
686 | #endif | |
687 | #endif | |
688 | ||
646d7043 SRRH |
689 | /* |
690 | * If an arch would like functions that are only traced | |
691 | * by the function graph tracer to jump directly to its own | |
692 | * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR | |
693 | * to be that address to jump to. | |
694 | */ | |
695 | #ifndef FTRACE_GRAPH_TRAMP_ADDR | |
696 | #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0) | |
697 | #endif | |
698 | ||
fb52607a FW |
699 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
700 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
701 | extern int ftrace_enable_ftrace_graph_caller(void); |
702 | extern int ftrace_disable_ftrace_graph_caller(void); | |
703 | #else | |
704 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
705 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 706 | #endif |
ad90c0e3 | 707 | |
31e88909 | 708 | /** |
57794a9d | 709 | * ftrace_make_nop - convert code into nop |
31e88909 | 710 | * @mod: module structure if called by module load initialization |
fbf6c73c | 711 | * @rec: the call site record (e.g. mcount/fentry) |
31e88909 SR |
712 | * @addr: the address that the call site should be calling |
713 | * | |
714 | * This is a very sensitive operation and great care needs | |
715 | * to be taken by the arch. The operation should carefully | |
716 | * read the location, check to see if what is read is indeed | |
717 | * what we expect it to be, and then on success of the compare, | |
718 | * it should write to the location. | |
719 | * | |
720 | * The code segment at @rec->ip should be a caller to @addr | |
721 | * | |
722 | * Return must be: | |
723 | * 0 on success | |
724 | * -EFAULT on error reading the location | |
725 | * -EINVAL on a failed compare of the contents | |
726 | * -EPERM on error writing to the location | |
727 | * Any other value will be considered a failure. | |
728 | */ | |
729 | extern int ftrace_make_nop(struct module *mod, | |
730 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 731 | |
67ccddf8 IL |
732 | /** |
733 | * ftrace_need_init_nop - return whether nop call sites should be initialized | |
734 | * | |
735 | * Normally the compiler's -mnop-mcount generates suitable nops, so we don't | |
736 | * need to call ftrace_init_nop() if the code is built with that flag. | |
737 | * Architectures where this is not always the case may define their own | |
738 | * condition. | |
739 | * | |
740 | * Return must be: | |
741 | * 0 if ftrace_init_nop() should be called | |
742 | * Nonzero if ftrace_init_nop() should not be called | |
743 | */ | |
744 | ||
745 | #ifndef ftrace_need_init_nop | |
746 | #define ftrace_need_init_nop() (!__is_defined(CC_USING_NOP_MCOUNT)) | |
747 | #endif | |
fbf6c73c MR |
748 | |
749 | /** | |
750 | * ftrace_init_nop - initialize a nop call site | |
751 | * @mod: module structure if called by module load initialization | |
752 | * @rec: the call site record (e.g. mcount/fentry) | |
753 | * | |
754 | * This is a very sensitive operation and great care needs | |
755 | * to be taken by the arch. The operation should carefully | |
756 | * read the location, check to see if what is read is indeed | |
757 | * what we expect it to be, and then on success of the compare, | |
758 | * it should write to the location. | |
759 | * | |
760 | * The code segment at @rec->ip should contain the contents created by | |
761 | * the compiler | |
762 | * | |
763 | * Return must be: | |
764 | * 0 on success | |
765 | * -EFAULT on error reading the location | |
766 | * -EINVAL on a failed compare of the contents | |
767 | * -EPERM on error writing to the location | |
768 | * Any other value will be considered a failure. | |
769 | */ | |
770 | #ifndef ftrace_init_nop | |
771 | static inline int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec) | |
772 | { | |
773 | return ftrace_make_nop(mod, rec, MCOUNT_ADDR); | |
774 | } | |
775 | #endif | |
776 | ||
593eb8a2 | 777 | /** |
31e88909 | 778 | * ftrace_make_call - convert a nop call site into a call to addr |
fbf6c73c | 779 | * @rec: the call site record (e.g. mcount/fentry) |
31e88909 | 780 | * @addr: the address that the call site should call |
593eb8a2 SR |
781 | * |
782 | * This is a very sensitive operation and great care needs | |
783 | * to be taken by the arch. The operation should carefully | |
784 | * read the location, check to see if what is read is indeed | |
785 | * what we expect it to be, and then on success of the compare, | |
786 | * it should write to the location. | |
787 | * | |
31e88909 SR |
788 | * The code segment at @rec->ip should be a nop |
789 | * | |
593eb8a2 SR |
790 | * Return must be: |
791 | * 0 on success | |
792 | * -EFAULT on error reading the location | |
793 | * -EINVAL on a failed compare of the contents | |
794 | * -EPERM on error writing to the location | |
795 | * Any other value will be considered a failure. | |
796 | */ | |
31e88909 SR |
797 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
798 | ||
cbad0fb2 MR |
799 | #if defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) || \ |
800 | defined(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS) | |
08f6fba5 SR |
801 | /** |
802 | * ftrace_modify_call - convert from one addr to another (no nop) | |
fbf6c73c | 803 | * @rec: the call site record (e.g. mcount/fentry) |
08f6fba5 SR |
804 | * @old_addr: the address expected to be currently called to |
805 | * @addr: the address to change to | |
806 | * | |
807 | * This is a very sensitive operation and great care needs | |
808 | * to be taken by the arch. The operation should carefully | |
809 | * read the location, check to see if what is read is indeed | |
810 | * what we expect it to be, and then on success of the compare, | |
811 | * it should write to the location. | |
812 | * | |
cbad0fb2 MR |
813 | * When using call ops, this is called when the associated ops change, even |
814 | * when (addr == old_addr). | |
815 | * | |
08f6fba5 SR |
816 | * The code segment at @rec->ip should be a caller to @old_addr |
817 | * | |
818 | * Return must be: | |
819 | * 0 on success | |
820 | * -EFAULT on error reading the location | |
821 | * -EINVAL on a failed compare of the contents | |
822 | * -EPERM on error writing to the location | |
823 | * Any other value will be considered a failure. | |
824 | */ | |
825 | extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, | |
826 | unsigned long addr); | |
827 | #else | |
828 | /* Should never be called */ | |
829 | static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, | |
830 | unsigned long addr) | |
831 | { | |
832 | return -EINVAL; | |
833 | } | |
834 | #endif | |
835 | ||
31e88909 SR |
836 | /* May be defined in arch */ |
837 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 838 | |
ecea656d | 839 | extern int skip_trace(unsigned long ip); |
a949ae56 | 840 | extern void ftrace_module_init(struct module *mod); |
7dcd182b | 841 | extern void ftrace_module_enable(struct module *mod); |
049fb9bd | 842 | extern void ftrace_release_mod(struct module *mod); |
ecea656d | 843 | |
c0719e5a SR |
844 | extern void ftrace_disable_daemon(void); |
845 | extern void ftrace_enable_daemon(void); | |
4dc93676 | 846 | #else /* CONFIG_DYNAMIC_FTRACE */ |
4dbf6bc2 | 847 | static inline int skip_trace(unsigned long ip) { return 0; } |
4dbf6bc2 SR |
848 | static inline void ftrace_disable_daemon(void) { } |
849 | static inline void ftrace_enable_daemon(void) { } | |
7dcd182b JY |
850 | static inline void ftrace_module_init(struct module *mod) { } |
851 | static inline void ftrace_module_enable(struct module *mod) { } | |
852 | static inline void ftrace_release_mod(struct module *mod) { } | |
d88471cb | 853 | static inline int ftrace_text_reserved(const void *start, const void *end) |
2cfa1978 MH |
854 | { |
855 | return 0; | |
856 | } | |
4dc93676 SR |
857 | static inline unsigned long ftrace_location(unsigned long ip) |
858 | { | |
859 | return 0; | |
860 | } | |
fc13cb0c SR |
861 | |
862 | /* | |
863 | * Again users of functions that have ftrace_ops may not | |
864 | * have them defined when ftrace is not enabled, but these | |
865 | * functions may still be called. Use a macro instead of inline. | |
866 | */ | |
867 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
96de37b6 | 868 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
647664ea | 869 | #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) |
4f554e95 | 870 | #define ftrace_set_filter_ips(ops, ips, cnt, remove, reset) ({ -ENODEV; }) |
5500fa51 JO |
871 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
872 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) | |
873 | #define ftrace_free_filter(ops) do { } while (0) | |
d032ae89 | 874 | #define ftrace_ops_set_global_filter(ops) do { } while (0) |
fc13cb0c SR |
875 | |
876 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
877 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
878 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
879 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
fc13cb0c SR |
880 | static inline int |
881 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
aec0be2d SRRH |
882 | |
883 | static inline bool is_ftrace_trampoline(unsigned long addr) | |
884 | { | |
885 | return false; | |
886 | } | |
ecea656d | 887 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 888 | |
0c0593b4 SRV |
889 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
890 | #ifndef ftrace_graph_func | |
891 | #define ftrace_graph_func ftrace_stub | |
892 | #define FTRACE_OPS_GRAPH_STUB FTRACE_OPS_FL_STUB | |
893 | #else | |
894 | #define FTRACE_OPS_GRAPH_STUB 0 | |
895 | #endif | |
896 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
897 | ||
aeaee8a2 IM |
898 | /* totally disable ftrace - can not re-enable after this */ |
899 | void ftrace_kill(void); | |
900 | ||
f43fdad8 IM |
901 | static inline void tracer_disable(void) |
902 | { | |
606576ce | 903 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
904 | ftrace_enabled = 0; |
905 | #endif | |
906 | } | |
907 | ||
37002735 HY |
908 | /* |
909 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 910 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
911 | * disable/restore. |
912 | */ | |
9bdeb7b5 HY |
913 | static inline int __ftrace_enabled_save(void) |
914 | { | |
606576ce | 915 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
916 | int saved_ftrace_enabled = ftrace_enabled; |
917 | ftrace_enabled = 0; | |
918 | return saved_ftrace_enabled; | |
919 | #else | |
920 | return 0; | |
921 | #endif | |
922 | } | |
923 | ||
924 | static inline void __ftrace_enabled_restore(int enabled) | |
925 | { | |
606576ce | 926 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
927 | ftrace_enabled = enabled; |
928 | #endif | |
929 | } | |
930 | ||
eed542d6 AT |
931 | /* All archs should have this, but we define it for consistency */ |
932 | #ifndef ftrace_return_address0 | |
933 | # define ftrace_return_address0 __builtin_return_address(0) | |
934 | #endif | |
935 | ||
936 | /* Archs may use other ways for ADDR1 and beyond */ | |
937 | #ifndef ftrace_return_address | |
c79a61f5 | 938 | # ifdef CONFIG_FRAME_POINTER |
eed542d6 | 939 | # define ftrace_return_address(n) __builtin_return_address(n) |
c79a61f5 | 940 | # else |
eed542d6 | 941 | # define ftrace_return_address(n) 0UL |
c79a61f5 | 942 | # endif |
eed542d6 AT |
943 | #endif |
944 | ||
945 | #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0) | |
946 | #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1)) | |
947 | #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2)) | |
948 | #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3)) | |
949 | #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4)) | |
950 | #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) | |
951 | #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6)) | |
352ad25a | 952 | |
f904f582 SAS |
953 | static inline unsigned long get_lock_parent_ip(void) |
954 | { | |
955 | unsigned long addr = CALLER_ADDR0; | |
956 | ||
957 | if (!in_lock_functions(addr)) | |
958 | return addr; | |
959 | addr = CALLER_ADDR1; | |
960 | if (!in_lock_functions(addr)) | |
961 | return addr; | |
962 | return CALLER_ADDR2; | |
963 | } | |
964 | ||
c3bc8fd6 | 965 | #ifdef CONFIG_TRACE_PREEMPT_TOGGLE |
489f1396 IM |
966 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
967 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 968 | #else |
b02ee9a3 MB |
969 | /* |
970 | * Use defines instead of static inlines because some arches will make code out | |
971 | * of the CALLER_ADDR, when we really want these to be a real nop. | |
972 | */ | |
973 | # define trace_preempt_on(a0, a1) do { } while (0) | |
974 | # define trace_preempt_off(a0, a1) do { } while (0) | |
6cd8a4bb SR |
975 | #endif |
976 | ||
68bf21aa SR |
977 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
978 | extern void ftrace_init(void); | |
a1326b17 MR |
979 | #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY |
980 | #define FTRACE_CALLSITE_SECTION "__patchable_function_entries" | |
981 | #else | |
982 | #define FTRACE_CALLSITE_SECTION "__mcount_loc" | |
983 | #endif | |
68bf21aa SR |
984 | #else |
985 | static inline void ftrace_init(void) { } | |
986 | #endif | |
987 | ||
287b6e68 FW |
988 | /* |
989 | * Structure that defines an entry function trace. | |
a4a551b8 NK |
990 | * It's already packed but the attribute "packed" is needed |
991 | * to remove extra padding at the end. | |
287b6e68 FW |
992 | */ |
993 | struct ftrace_graph_ent { | |
994 | unsigned long func; /* Current function */ | |
995 | int depth; | |
a4a551b8 | 996 | } __packed; |
dd0e545f | 997 | |
caf4b323 FW |
998 | /* |
999 | * Structure that defines a return function trace. | |
a4a551b8 NK |
1000 | * It's already packed but the attribute "packed" is needed |
1001 | * to remove extra padding at the end. | |
caf4b323 | 1002 | */ |
fb52607a | 1003 | struct ftrace_graph_ret { |
caf4b323 | 1004 | unsigned long func; /* Current function */ |
60602cb5 | 1005 | int depth; |
0231022c | 1006 | /* Number of functions that overran the depth limit for current task */ |
60602cb5 | 1007 | unsigned int overrun; |
a4a551b8 NK |
1008 | unsigned long long calltime; |
1009 | unsigned long long rettime; | |
a4a551b8 | 1010 | } __packed; |
caf4b323 | 1011 | |
62b915f1 JO |
1012 | /* Type of the callback handlers for tracing function graph*/ |
1013 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
1014 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
1015 | ||
e8025bab SRV |
1016 | extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace); |
1017 | ||
fb52607a | 1018 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 1019 | |
688f7089 SRV |
1020 | struct fgraph_ops { |
1021 | trace_func_graph_ent_t entryfunc; | |
1022 | trace_func_graph_ret_t retfunc; | |
1023 | }; | |
1024 | ||
712406a6 SR |
1025 | /* |
1026 | * Stack of return addresses for functions | |
1027 | * of a thread. | |
1028 | * Used in struct thread_info | |
1029 | */ | |
1030 | struct ftrace_ret_stack { | |
1031 | unsigned long ret; | |
1032 | unsigned long func; | |
1033 | unsigned long long calltime; | |
8861dd30 | 1034 | #ifdef CONFIG_FUNCTION_PROFILER |
a2a16d6a | 1035 | unsigned long long subtime; |
8861dd30 | 1036 | #endif |
daa460a8 | 1037 | #ifdef HAVE_FUNCTION_GRAPH_FP_TEST |
71e308a2 | 1038 | unsigned long fp; |
daa460a8 | 1039 | #endif |
9a7c348b JP |
1040 | #ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR |
1041 | unsigned long *retp; | |
1042 | #endif | |
712406a6 SR |
1043 | }; |
1044 | ||
1045 | /* | |
1046 | * Primary handler of a function return. | |
1047 | * It relays on ftrace_return_to_handler. | |
1048 | * Defined in entry_32/64.S | |
1049 | */ | |
1050 | extern void return_to_handler(void); | |
1051 | ||
1052 | extern int | |
8114865f SRV |
1053 | function_graph_enter(unsigned long ret, unsigned long func, |
1054 | unsigned long frame_pointer, unsigned long *retp); | |
712406a6 | 1055 | |
b0e21a61 SRV |
1056 | struct ftrace_ret_stack * |
1057 | ftrace_graph_get_ret_stack(struct task_struct *task, int idx); | |
1058 | ||
223918e3 JP |
1059 | unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, |
1060 | unsigned long ret, unsigned long *retp); | |
1061 | ||
8b96f011 FW |
1062 | /* |
1063 | * Sometimes we don't want to trace a function with the function | |
1064 | * graph tracer but we want them to keep traced by the usual function | |
1065 | * tracer if the function graph tracer is not configured. | |
1066 | */ | |
1067 | #define __notrace_funcgraph notrace | |
1068 | ||
f201ae23 FW |
1069 | #define FTRACE_RETFUNC_DEPTH 50 |
1070 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
688f7089 SRV |
1071 | |
1072 | extern int register_ftrace_graph(struct fgraph_ops *ops); | |
1073 | extern void unregister_ftrace_graph(struct fgraph_ops *ops); | |
287b6e68 | 1074 | |
18bfee32 CL |
1075 | /** |
1076 | * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called | |
1077 | * | |
1078 | * ftrace_graph_stop() is called when a severe error is detected in | |
1079 | * the function graph tracing. This function is called by the critical | |
1080 | * paths of function graph to keep those paths from doing any more harm. | |
1081 | */ | |
1082 | DECLARE_STATIC_KEY_FALSE(kill_ftrace_graph); | |
1083 | ||
1084 | static inline bool ftrace_graph_is_dead(void) | |
1085 | { | |
1086 | return static_branch_unlikely(&kill_ftrace_graph); | |
1087 | } | |
1088 | ||
14a866c5 SR |
1089 | extern void ftrace_graph_stop(void); |
1090 | ||
287b6e68 FW |
1091 | /* The current handlers in use */ |
1092 | extern trace_func_graph_ret_t ftrace_graph_return; | |
1093 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 1094 | |
fb52607a FW |
1095 | extern void ftrace_graph_init_task(struct task_struct *t); |
1096 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 1097 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 | 1098 | |
380c4b14 FW |
1099 | static inline void pause_graph_tracing(void) |
1100 | { | |
1101 | atomic_inc(¤t->tracing_graph_pause); | |
1102 | } | |
1103 | ||
1104 | static inline void unpause_graph_tracing(void) | |
1105 | { | |
1106 | atomic_dec(¤t->tracing_graph_pause); | |
1107 | } | |
5ac9f622 | 1108 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
1109 | |
1110 | #define __notrace_funcgraph | |
1111 | ||
fb52607a FW |
1112 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
1113 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 1114 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 1115 | |
688f7089 SRV |
1116 | /* Define as macros as fgraph_ops may not be defined */ |
1117 | #define register_ftrace_graph(ops) ({ -1; }) | |
1118 | #define unregister_ftrace_graph(ops) do { } while (0) | |
380c4b14 | 1119 | |
223918e3 JP |
1120 | static inline unsigned long |
1121 | ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, | |
1122 | unsigned long *retp) | |
1123 | { | |
1124 | return ret; | |
1125 | } | |
1126 | ||
380c4b14 FW |
1127 | static inline void pause_graph_tracing(void) { } |
1128 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 1129 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 1130 | |
ea4e2bc4 | 1131 | #ifdef CONFIG_TRACING |
cecbca96 FW |
1132 | enum ftrace_dump_mode; |
1133 | ||
1134 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
0daa2302 | 1135 | extern int tracepoint_printk; |
526211bc | 1136 | |
de7edd31 SRRH |
1137 | extern void disable_trace_on_warning(void); |
1138 | extern int __disable_trace_on_warning; | |
1139 | ||
42391745 | 1140 | int tracepoint_printk_sysctl(struct ctl_table *table, int write, |
32927393 | 1141 | void *buffer, size_t *lenp, loff_t *ppos); |
42391745 | 1142 | |
de7edd31 SRRH |
1143 | #else /* CONFIG_TRACING */ |
1144 | static inline void disable_trace_on_warning(void) { } | |
ea4e2bc4 SR |
1145 | #endif /* CONFIG_TRACING */ |
1146 | ||
e7b8e675 MF |
1147 | #ifdef CONFIG_FTRACE_SYSCALLS |
1148 | ||
1149 | unsigned long arch_syscall_addr(int nr); | |
1150 | ||
1151 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
1152 | ||
16444a8a | 1153 | #endif /* _LINUX_FTRACE_H */ |