]>
Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | #ifndef _LINUX_KPROBES_H |
3 | #define _LINUX_KPROBES_H | |
4 | /* | |
5 | * Kernel Probes (KProbes) | |
6 | * include/linux/kprobes.h | |
7 | * | |
1da177e4 LT |
8 | * Copyright (C) IBM Corporation, 2002, 2004 |
9 | * | |
10 | * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel | |
11 | * Probes initial implementation ( includes suggestions from | |
12 | * Rusty Russell). | |
13 | * 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes | |
14 | * interface to access function arguments. | |
b94cce92 HN |
15 | * 2005-May Hien Nguyen <hien@us.ibm.com> and Jim Keniston |
16 | * <jkenisto@us.ibm.com> and Prasanna S Panchamukhi | |
17 | * <prasanna@in.ibm.com> added function-return probes. | |
1da177e4 | 18 | */ |
7d134b2c | 19 | #include <linux/compiler.h> |
36dcd67a | 20 | #include <linux/linkage.h> |
1da177e4 LT |
21 | #include <linux/list.h> |
22 | #include <linux/notifier.h> | |
23 | #include <linux/smp.h> | |
187f1882 | 24 | #include <linux/bug.h> |
e6584523 | 25 | #include <linux/percpu.h> |
3516a460 AM |
26 | #include <linux/spinlock.h> |
27 | #include <linux/rcupdate.h> | |
7a7d1cf9 | 28 | #include <linux/mutex.h> |
ae6aa16f | 29 | #include <linux/ftrace.h> |
d741bf41 | 30 | #include <linux/refcount.h> |
6e426e0f | 31 | #include <linux/freelist.h> |
7d134b2c | 32 | #include <asm/kprobes.h> |
b94cce92 | 33 | |
00d7c05a | 34 | #ifdef CONFIG_KPROBES |
1da177e4 | 35 | |
ea32c65c PP |
36 | /* kprobe_status settings */ |
37 | #define KPROBE_HIT_ACTIVE 0x00000001 | |
38 | #define KPROBE_HIT_SS 0x00000002 | |
39 | #define KPROBE_REENTER 0x00000004 | |
40 | #define KPROBE_HIT_SSDONE 0x00000008 | |
41 | ||
dc19835d | 42 | #else /* CONFIG_KPROBES */ |
7d134b2c | 43 | #include <asm-generic/kprobes.h> |
dc19835d MH |
44 | typedef int kprobe_opcode_t; |
45 | struct arch_specific_insn { | |
46 | int dummy; | |
47 | }; | |
dc19835d | 48 | #endif /* CONFIG_KPROBES */ |
d0aaff97 | 49 | |
1da177e4 LT |
50 | struct kprobe; |
51 | struct pt_regs; | |
b94cce92 HN |
52 | struct kretprobe; |
53 | struct kretprobe_instance; | |
1da177e4 | 54 | typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *); |
1da177e4 LT |
55 | typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *, |
56 | unsigned long flags); | |
57 | typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *, | |
58 | int trapnr); | |
b94cce92 HN |
59 | typedef int (*kretprobe_handler_t) (struct kretprobe_instance *, |
60 | struct pt_regs *); | |
61 | ||
1da177e4 LT |
62 | struct kprobe { |
63 | struct hlist_node hlist; | |
64 | ||
64f562c6 AM |
65 | /* list of kprobes for multi-handler support */ |
66 | struct list_head list; | |
67 | ||
ea32c65c PP |
68 | /*count the number of times this probe was temporarily disarmed */ |
69 | unsigned long nmissed; | |
70 | ||
1da177e4 LT |
71 | /* location of the probe point */ |
72 | kprobe_opcode_t *addr; | |
73 | ||
3a872d89 | 74 | /* Allow user to indicate symbol name of the probe point */ |
9b3af29b | 75 | const char *symbol_name; |
3a872d89 AM |
76 | |
77 | /* Offset into the symbol */ | |
78 | unsigned int offset; | |
79 | ||
1da177e4 LT |
80 | /* Called before addr is executed. */ |
81 | kprobe_pre_handler_t pre_handler; | |
82 | ||
83 | /* Called after addr is executed, unless... */ | |
84 | kprobe_post_handler_t post_handler; | |
85 | ||
cc00e9cf MH |
86 | /* |
87 | * ... called if executing addr causes a fault (eg. page fault). | |
88 | * Return 1 if it handled fault, otherwise kernel will see it. | |
89 | */ | |
1da177e4 LT |
90 | kprobe_fault_handler_t fault_handler; |
91 | ||
1da177e4 LT |
92 | /* Saved opcode (which has been replaced with breakpoint) */ |
93 | kprobe_opcode_t opcode; | |
94 | ||
95 | /* copy of the original instruction */ | |
96 | struct arch_specific_insn ainsn; | |
e8386a0c | 97 | |
de5bd88d MH |
98 | /* |
99 | * Indicates various status flags. | |
100 | * Protected by kprobe_mutex after this kprobe is registered. | |
101 | */ | |
e8386a0c | 102 | u32 flags; |
1da177e4 LT |
103 | }; |
104 | ||
e8386a0c MH |
105 | /* Kprobe status flags */ |
106 | #define KPROBE_FLAG_GONE 1 /* breakpoint has already gone */ | |
de5bd88d | 107 | #define KPROBE_FLAG_DISABLED 2 /* probe is temporarily disabled */ |
afd66255 MH |
108 | #define KPROBE_FLAG_OPTIMIZED 4 /* |
109 | * probe is really optimized. | |
110 | * NOTE: | |
111 | * this flag is only for optimized_kprobe. | |
112 | */ | |
ae6aa16f | 113 | #define KPROBE_FLAG_FTRACE 8 /* probe is using ftrace */ |
e8386a0c | 114 | |
de5bd88d | 115 | /* Has this kprobe gone ? */ |
e8386a0c MH |
116 | static inline int kprobe_gone(struct kprobe *p) |
117 | { | |
118 | return p->flags & KPROBE_FLAG_GONE; | |
119 | } | |
120 | ||
de5bd88d MH |
121 | /* Is this kprobe disabled ? */ |
122 | static inline int kprobe_disabled(struct kprobe *p) | |
123 | { | |
124 | return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE); | |
125 | } | |
afd66255 MH |
126 | |
127 | /* Is this kprobe really running optimized path ? */ | |
128 | static inline int kprobe_optimized(struct kprobe *p) | |
129 | { | |
130 | return p->flags & KPROBE_FLAG_OPTIMIZED; | |
131 | } | |
ae6aa16f MH |
132 | |
133 | /* Is this kprobe uses ftrace ? */ | |
134 | static inline int kprobe_ftrace(struct kprobe *p) | |
135 | { | |
136 | return p->flags & KPROBE_FLAG_FTRACE; | |
137 | } | |
138 | ||
b94cce92 HN |
139 | /* |
140 | * Function-return probe - | |
141 | * Note: | |
142 | * User needs to provide a handler function, and initialize maxactive. | |
143 | * maxactive - The maximum number of instances of the probed function that | |
144 | * can be active concurrently. | |
145 | * nmissed - tracks the number of times the probed function's return was | |
146 | * ignored, due to maxactive being too low. | |
147 | * | |
148 | */ | |
d741bf41 PZ |
149 | struct kretprobe_holder { |
150 | struct kretprobe *rp; | |
151 | refcount_t ref; | |
152 | }; | |
153 | ||
b94cce92 HN |
154 | struct kretprobe { |
155 | struct kprobe kp; | |
156 | kretprobe_handler_t handler; | |
f47cd9b5 | 157 | kretprobe_handler_t entry_handler; |
b94cce92 HN |
158 | int maxactive; |
159 | int nmissed; | |
f47cd9b5 | 160 | size_t data_size; |
6e426e0f | 161 | struct freelist_head freelist; |
d741bf41 | 162 | struct kretprobe_holder *rph; |
b94cce92 HN |
163 | }; |
164 | ||
165 | struct kretprobe_instance { | |
b3388178 | 166 | union { |
6e426e0f | 167 | struct freelist_node freelist; |
b3388178 MH |
168 | struct rcu_head rcu; |
169 | }; | |
6e426e0f | 170 | struct llist_node llist; |
d741bf41 | 171 | struct kretprobe_holder *rph; |
802eae7c | 172 | kprobe_opcode_t *ret_addr; |
3ff9c075 | 173 | void *fp; |
67a862a9 | 174 | char data[]; |
b94cce92 HN |
175 | }; |
176 | ||
f438d914 MH |
177 | struct kretprobe_blackpoint { |
178 | const char *name; | |
179 | void *addr; | |
180 | }; | |
3d8d996e | 181 | |
376e2424 MH |
182 | struct kprobe_blacklist_entry { |
183 | struct list_head list; | |
3d8d996e | 184 | unsigned long start_addr; |
376e2424 | 185 | unsigned long end_addr; |
3d8d996e SD |
186 | }; |
187 | ||
dc19835d MH |
188 | #ifdef CONFIG_KPROBES |
189 | DECLARE_PER_CPU(struct kprobe *, current_kprobe); | |
190 | DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); | |
191 | ||
b1801812 IM |
192 | /* |
193 | * For #ifdef avoidance: | |
194 | */ | |
195 | static inline int kprobes_built_in(void) | |
196 | { | |
197 | return 1; | |
198 | } | |
199 | ||
66ada2cc MH |
200 | extern void kprobe_busy_begin(void); |
201 | extern void kprobe_busy_end(void); | |
202 | ||
dc19835d MH |
203 | #ifdef CONFIG_KRETPROBES |
204 | extern void arch_prepare_kretprobe(struct kretprobe_instance *ri, | |
205 | struct pt_regs *regs); | |
206 | extern int arch_trampoline_kprobe(struct kprobe *p); | |
66ada2cc MH |
207 | |
208 | /* If the trampoline handler called from a kprobe, use this version */ | |
209 | unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs, | |
210 | void *trampoline_address, | |
211 | void *frame_pointer); | |
212 | ||
213 | static nokprobe_inline | |
214 | unsigned long kretprobe_trampoline_handler(struct pt_regs *regs, | |
215 | void *trampoline_address, | |
216 | void *frame_pointer) | |
217 | { | |
218 | unsigned long ret; | |
219 | /* | |
220 | * Set a dummy kprobe for avoiding kretprobe recursion. | |
221 | * Since kretprobe never runs in kprobe handler, no kprobe must | |
222 | * be running at this point. | |
223 | */ | |
224 | kprobe_busy_begin(); | |
225 | ret = __kretprobe_trampoline_handler(regs, trampoline_address, frame_pointer); | |
226 | kprobe_busy_end(); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
d741bf41 PZ |
231 | static nokprobe_inline struct kretprobe *get_kretprobe(struct kretprobe_instance *ri) |
232 | { | |
233 | RCU_LOCKDEP_WARN(!rcu_read_lock_any_held(), | |
234 | "Kretprobe is accessed from instance under preemptive context"); | |
235 | ||
236 | return READ_ONCE(ri->rph->rp); | |
237 | } | |
238 | ||
dc19835d MH |
239 | #else /* CONFIG_KRETPROBES */ |
240 | static inline void arch_prepare_kretprobe(struct kretprobe *rp, | |
241 | struct pt_regs *regs) | |
242 | { | |
243 | } | |
244 | static inline int arch_trampoline_kprobe(struct kprobe *p) | |
245 | { | |
246 | return 0; | |
247 | } | |
248 | #endif /* CONFIG_KRETPROBES */ | |
249 | ||
f438d914 MH |
250 | extern struct kretprobe_blackpoint kretprobe_blacklist[]; |
251 | ||
8c1c9356 AM |
252 | #ifdef CONFIG_KPROBES_SANITY_TEST |
253 | extern int init_test_probes(void); | |
254 | #else | |
255 | static inline int init_test_probes(void) | |
256 | { | |
257 | return 0; | |
258 | } | |
259 | #endif /* CONFIG_KPROBES_SANITY_TEST */ | |
260 | ||
1da177e4 | 261 | extern int arch_prepare_kprobe(struct kprobe *p); |
7e1048b1 RL |
262 | extern void arch_arm_kprobe(struct kprobe *p); |
263 | extern void arch_disarm_kprobe(struct kprobe *p); | |
6772926b | 264 | extern int arch_init_kprobes(void); |
bf8d5c52 | 265 | extern void kprobes_inc_nmissed_count(struct kprobe *p); |
be8f2743 | 266 | extern bool arch_within_kprobe_blacklist(unsigned long addr); |
fb1a59fa | 267 | extern int arch_populate_kprobe_blacklist(void); |
659b957f | 268 | extern bool arch_kprobe_on_func_entry(unsigned long offset); |
97c753e6 | 269 | extern int kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset); |
1da177e4 | 270 | |
e5779e8e | 271 | extern bool within_kprobe_blacklist(unsigned long addr); |
fb1a59fa MH |
272 | extern int kprobe_add_ksym_blacklist(unsigned long entry); |
273 | extern int kprobe_add_area_blacklist(unsigned long start, unsigned long end); | |
e5779e8e | 274 | |
c802d64a HC |
275 | struct kprobe_insn_cache { |
276 | struct mutex mutex; | |
af96397d HC |
277 | void *(*alloc)(void); /* allocate insn page */ |
278 | void (*free)(void *); /* free insn page */ | |
d002b8bc | 279 | const char *sym; /* symbol for insn pages */ |
c802d64a HC |
280 | struct list_head pages; /* list of kprobe_insn_page */ |
281 | size_t insn_size; /* size of instruction slot */ | |
282 | int nr_garbage; | |
283 | }; | |
284 | ||
5b485629 | 285 | #ifdef __ARCH_WANT_KPROBES_INSN_SLOT |
c802d64a HC |
286 | extern kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c); |
287 | extern void __free_insn_slot(struct kprobe_insn_cache *c, | |
288 | kprobe_opcode_t *slot, int dirty); | |
5b485629 MH |
289 | /* sleep-less address checking routine */ |
290 | extern bool __is_insn_slot_addr(struct kprobe_insn_cache *c, | |
291 | unsigned long addr); | |
c802d64a HC |
292 | |
293 | #define DEFINE_INSN_CACHE_OPS(__name) \ | |
294 | extern struct kprobe_insn_cache kprobe_##__name##_slots; \ | |
295 | \ | |
296 | static inline kprobe_opcode_t *get_##__name##_slot(void) \ | |
297 | { \ | |
298 | return __get_insn_slot(&kprobe_##__name##_slots); \ | |
299 | } \ | |
300 | \ | |
301 | static inline void free_##__name##_slot(kprobe_opcode_t *slot, int dirty)\ | |
302 | { \ | |
303 | __free_insn_slot(&kprobe_##__name##_slots, slot, dirty); \ | |
304 | } \ | |
5b485629 MH |
305 | \ |
306 | static inline bool is_kprobe_##__name##_slot(unsigned long addr) \ | |
307 | { \ | |
308 | return __is_insn_slot_addr(&kprobe_##__name##_slots, addr); \ | |
309 | } | |
d002b8bc AH |
310 | #define KPROBE_INSN_PAGE_SYM "kprobe_insn_page" |
311 | #define KPROBE_OPTINSN_PAGE_SYM "kprobe_optinsn_page" | |
312 | int kprobe_cache_get_kallsym(struct kprobe_insn_cache *c, unsigned int *symnum, | |
313 | unsigned long *value, char *type, char *sym); | |
5b485629 MH |
314 | #else /* __ARCH_WANT_KPROBES_INSN_SLOT */ |
315 | #define DEFINE_INSN_CACHE_OPS(__name) \ | |
316 | static inline bool is_kprobe_##__name##_slot(unsigned long addr) \ | |
317 | { \ | |
318 | return 0; \ | |
319 | } | |
320 | #endif | |
c802d64a HC |
321 | |
322 | DEFINE_INSN_CACHE_OPS(insn); | |
323 | ||
afd66255 MH |
324 | #ifdef CONFIG_OPTPROBES |
325 | /* | |
326 | * Internal structure for direct jump optimized probe | |
327 | */ | |
328 | struct optimized_kprobe { | |
329 | struct kprobe kp; | |
330 | struct list_head list; /* list for optimizing queue */ | |
331 | struct arch_optimized_insn optinsn; | |
332 | }; | |
333 | ||
334 | /* Architecture dependent functions for direct jump optimization */ | |
335 | extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn); | |
336 | extern int arch_check_optimized_kprobe(struct optimized_kprobe *op); | |
cbf6ab52 MH |
337 | extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, |
338 | struct kprobe *orig); | |
afd66255 | 339 | extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op); |
cd7ebe22 | 340 | extern void arch_optimize_kprobes(struct list_head *oplist); |
f984ba4e MH |
341 | extern void arch_unoptimize_kprobes(struct list_head *oplist, |
342 | struct list_head *done_list); | |
afd66255 | 343 | extern void arch_unoptimize_kprobe(struct optimized_kprobe *op); |
afd66255 MH |
344 | extern int arch_within_optimized_kprobe(struct optimized_kprobe *op, |
345 | unsigned long addr); | |
346 | ||
347 | extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs); | |
b2be84df | 348 | |
c802d64a HC |
349 | DEFINE_INSN_CACHE_OPS(optinsn); |
350 | ||
b2be84df MH |
351 | #ifdef CONFIG_SYSCTL |
352 | extern int sysctl_kprobes_optimization; | |
353 | extern int proc_kprobes_optimization_handler(struct ctl_table *table, | |
32927393 | 354 | int write, void *buffer, |
b2be84df MH |
355 | size_t *length, loff_t *ppos); |
356 | #endif | |
30e7d894 TG |
357 | extern void wait_for_kprobe_optimizer(void); |
358 | #else | |
359 | static inline void wait_for_kprobe_optimizer(void) { } | |
afd66255 | 360 | #endif /* CONFIG_OPTPROBES */ |
e7dbfe34 | 361 | #ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16f | 362 | extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip, |
d19ad077 | 363 | struct ftrace_ops *ops, struct ftrace_regs *fregs); |
ae6aa16f MH |
364 | extern int arch_prepare_kprobe_ftrace(struct kprobe *p); |
365 | #endif | |
366 | ||
f7f242ff | 367 | int arch_check_ftrace_location(struct kprobe *p); |
afd66255 | 368 | |
d217d545 | 369 | /* Get the kprobe at this addr (if any) - called with preemption disabled */ |
1da177e4 LT |
370 | struct kprobe *get_kprobe(void *addr); |
371 | ||
e6584523 AM |
372 | /* kprobe_running() will just return the current_kprobe on this CPU */ |
373 | static inline struct kprobe *kprobe_running(void) | |
374 | { | |
b76834bc | 375 | return (__this_cpu_read(current_kprobe)); |
e6584523 AM |
376 | } |
377 | ||
378 | static inline void reset_current_kprobe(void) | |
379 | { | |
b76834bc | 380 | __this_cpu_write(current_kprobe, NULL); |
e6584523 AM |
381 | } |
382 | ||
383 | static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void) | |
384 | { | |
bdffd893 | 385 | return this_cpu_ptr(&kprobe_ctlblk); |
e6584523 AM |
386 | } |
387 | ||
290e3070 | 388 | kprobe_opcode_t *kprobe_lookup_name(const char *name, unsigned int offset); |
1da177e4 LT |
389 | int register_kprobe(struct kprobe *p); |
390 | void unregister_kprobe(struct kprobe *p); | |
9861668f MH |
391 | int register_kprobes(struct kprobe **kps, int num); |
392 | void unregister_kprobes(struct kprobe **kps, int num); | |
3d7e3382 | 393 | unsigned long arch_deref_entry_point(void *); |
1da177e4 | 394 | |
b94cce92 HN |
395 | int register_kretprobe(struct kretprobe *rp); |
396 | void unregister_kretprobe(struct kretprobe *rp); | |
4a296e07 MH |
397 | int register_kretprobes(struct kretprobe **rps, int num); |
398 | void unregister_kretprobes(struct kretprobe **rps, int num); | |
b94cce92 | 399 | |
b94cce92 | 400 | void kprobe_flush_task(struct task_struct *tk); |
8c1c9356 | 401 | |
82d083ab MH |
402 | void kprobe_free_init_mem(void); |
403 | ||
de5bd88d MH |
404 | int disable_kprobe(struct kprobe *kp); |
405 | int enable_kprobe(struct kprobe *kp); | |
406 | ||
24851d24 FW |
407 | void dump_kprobe(struct kprobe *kp); |
408 | ||
ad3bc25a BP |
409 | void *alloc_insn_page(void); |
410 | void free_insn_page(void *page); | |
411 | ||
d002b8bc AH |
412 | int kprobe_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
413 | char *sym); | |
414 | ||
415 | int arch_kprobe_get_kallsym(unsigned int *symnum, unsigned long *value, | |
416 | char *type, char *sym); | |
b1801812 | 417 | #else /* !CONFIG_KPROBES: */ |
00d7c05a | 418 | |
b1801812 IM |
419 | static inline int kprobes_built_in(void) |
420 | { | |
421 | return 0; | |
422 | } | |
423 | static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr) | |
424 | { | |
425 | return 0; | |
426 | } | |
785656a4 AS |
427 | static inline struct kprobe *get_kprobe(void *addr) |
428 | { | |
429 | return NULL; | |
430 | } | |
e6584523 | 431 | static inline struct kprobe *kprobe_running(void) |
1da177e4 | 432 | { |
e6584523 | 433 | return NULL; |
1da177e4 LT |
434 | } |
435 | static inline int register_kprobe(struct kprobe *p) | |
436 | { | |
437 | return -ENOSYS; | |
438 | } | |
9861668f MH |
439 | static inline int register_kprobes(struct kprobe **kps, int num) |
440 | { | |
441 | return -ENOSYS; | |
442 | } | |
1da177e4 LT |
443 | static inline void unregister_kprobe(struct kprobe *p) |
444 | { | |
445 | } | |
9861668f MH |
446 | static inline void unregister_kprobes(struct kprobe **kps, int num) |
447 | { | |
448 | } | |
b94cce92 HN |
449 | static inline int register_kretprobe(struct kretprobe *rp) |
450 | { | |
451 | return -ENOSYS; | |
452 | } | |
4a296e07 MH |
453 | static inline int register_kretprobes(struct kretprobe **rps, int num) |
454 | { | |
455 | return -ENOSYS; | |
456 | } | |
b94cce92 HN |
457 | static inline void unregister_kretprobe(struct kretprobe *rp) |
458 | { | |
459 | } | |
4a296e07 MH |
460 | static inline void unregister_kretprobes(struct kretprobe **rps, int num) |
461 | { | |
462 | } | |
b94cce92 HN |
463 | static inline void kprobe_flush_task(struct task_struct *tk) |
464 | { | |
465 | } | |
82d083ab MH |
466 | static inline void kprobe_free_init_mem(void) |
467 | { | |
468 | } | |
de5bd88d MH |
469 | static inline int disable_kprobe(struct kprobe *kp) |
470 | { | |
471 | return -ENOSYS; | |
472 | } | |
473 | static inline int enable_kprobe(struct kprobe *kp) | |
474 | { | |
475 | return -ENOSYS; | |
476 | } | |
fab94075 BP |
477 | |
478 | static inline bool within_kprobe_blacklist(unsigned long addr) | |
479 | { | |
480 | return true; | |
481 | } | |
d002b8bc AH |
482 | static inline int kprobe_get_kallsym(unsigned int symnum, unsigned long *value, |
483 | char *type, char *sym) | |
484 | { | |
485 | return -ERANGE; | |
486 | } | |
b1801812 | 487 | #endif /* CONFIG_KPROBES */ |
8f9b1528 MH |
488 | static inline int disable_kretprobe(struct kretprobe *rp) |
489 | { | |
490 | return disable_kprobe(&rp->kp); | |
491 | } | |
492 | static inline int enable_kretprobe(struct kretprobe *rp) | |
493 | { | |
494 | return enable_kprobe(&rp->kp); | |
495 | } | |
8f9b1528 | 496 | |
5b485629 MH |
497 | #ifndef CONFIG_KPROBES |
498 | static inline bool is_kprobe_insn_slot(unsigned long addr) | |
499 | { | |
500 | return false; | |
501 | } | |
502 | #endif | |
503 | #ifndef CONFIG_OPTPROBES | |
504 | static inline bool is_kprobe_optinsn_slot(unsigned long addr) | |
505 | { | |
506 | return false; | |
507 | } | |
508 | #endif | |
509 | ||
b98cca44 AK |
510 | /* Returns true if kprobes handled the fault */ |
511 | static nokprobe_inline bool kprobe_page_fault(struct pt_regs *regs, | |
512 | unsigned int trap) | |
513 | { | |
514 | if (!kprobes_built_in()) | |
515 | return false; | |
516 | if (user_mode(regs)) | |
517 | return false; | |
518 | /* | |
519 | * To be potentially processing a kprobe fault and to be allowed | |
520 | * to call kprobe_running(), we have to be non-preemptible. | |
521 | */ | |
522 | if (preemptible()) | |
523 | return false; | |
524 | if (!kprobe_running()) | |
525 | return false; | |
526 | return kprobe_fault_handler(regs, trap); | |
527 | } | |
528 | ||
b1801812 | 529 | #endif /* _LINUX_KPROBES_H */ |