projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
nlm: Ensure callback code also checks that the files match
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / kprobes.h
CommitLineData
1da177e4
LT		 1#ifndef _LINUX_KPROBES_H
2#define _LINUX_KPROBES_H
3/*
4 * Kernel Probes (KProbes)
5 * include/linux/kprobes.h
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 * Copyright (C) IBM Corporation, 2002, 2004
22 *
23 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
24 * Probes initial implementation ( includes suggestions from
25 * Rusty Russell).
26 * 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
27 * interface to access function arguments.
b94cce92
HN		 28 * 2005-May Hien Nguyen <hien@us.ibm.com> and Jim Keniston
29 * <jkenisto@us.ibm.com> and Prasanna S Panchamukhi
30 * <prasanna@in.ibm.com> added function-return probes.
1da177e4 31 */
324670b6 32#include <linux/compiler.h> /* for __kprobes */
36dcd67a 33#include <linux/linkage.h>
1da177e4
LT		 34#include <linux/list.h>
35#include <linux/notifier.h>
36#include <linux/smp.h>
187f1882 37#include <linux/bug.h>
e6584523 38#include <linux/percpu.h>
3516a460
AM		 39#include <linux/spinlock.h>
40#include <linux/rcupdate.h>
7a7d1cf9 41#include <linux/mutex.h>
ae6aa16f 42#include <linux/ftrace.h>
b94cce92 43
00d7c05a 44#ifdef CONFIG_KPROBES
1da177e4
LT		 45#include <asm/kprobes.h>
46
ea32c65c
PP		 47/* kprobe_status settings */
48#define KPROBE_HIT_ACTIVE 0x00000001
49#define KPROBE_HIT_SS 0x00000002
50#define KPROBE_REENTER 0x00000004
51#define KPROBE_HIT_SSDONE 0x00000008
52
dc19835d
MH		 53#else /* CONFIG_KPROBES */
54typedef int kprobe_opcode_t;
55struct arch_specific_insn {
56 int dummy;
57};
dc19835d 58#endif /* CONFIG_KPROBES */
d0aaff97 59
1da177e4
LT		 60struct kprobe;
61struct pt_regs;
b94cce92
HN		 62struct kretprobe;
63struct kretprobe_instance;
1da177e4
LT		 64typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
65typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
66typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
67 unsigned long flags);
68typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
69 int trapnr);
b94cce92
HN		 70typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
71 struct pt_regs *);
72
1da177e4
LT		 73struct kprobe {
74 struct hlist_node hlist;
75
64f562c6
AM		 76 /* list of kprobes for multi-handler support */
77 struct list_head list;
78
ea32c65c
PP		 79 /*count the number of times this probe was temporarily disarmed */
80 unsigned long nmissed;
81
1da177e4
LT		 82 /* location of the probe point */
83 kprobe_opcode_t *addr;
84
3a872d89 85 /* Allow user to indicate symbol name of the probe point */
9b3af29b 86 const char *symbol_name;
3a872d89
AM		 87
88 /* Offset into the symbol */
89 unsigned int offset;
90
1da177e4
LT		 91 /* Called before addr is executed. */
92 kprobe_pre_handler_t pre_handler;
93
94 /* Called after addr is executed, unless... */
95 kprobe_post_handler_t post_handler;
96
cc00e9cf
MH		 97 /*
98 * ... called if executing addr causes a fault (eg. page fault).
99 * Return 1 if it handled fault, otherwise kernel will see it.
100 */
1da177e4
LT		 101 kprobe_fault_handler_t fault_handler;
102
cc00e9cf
MH		 103 /*
104 * ... called if breakpoint trap occurs in probe handler.
105 * Return 1 if it handled break, otherwise kernel will see it.
106 */
1da177e4
LT		 107 kprobe_break_handler_t break_handler;
108
109 /* Saved opcode (which has been replaced with breakpoint) */
110 kprobe_opcode_t opcode;
111
112 /* copy of the original instruction */
113 struct arch_specific_insn ainsn;
e8386a0c 114
de5bd88d
MH		 115 /*
116 * Indicates various status flags.
117 * Protected by kprobe_mutex after this kprobe is registered.
118 */
e8386a0c 119 u32 flags;
1da177e4
LT		 120};
121
e8386a0c
MH		 122/* Kprobe status flags */
123#define KPROBE_FLAG_GONE 1 /* breakpoint has already gone */
de5bd88d 124#define KPROBE_FLAG_DISABLED 2 /* probe is temporarily disabled */
afd66255
MH		 125#define KPROBE_FLAG_OPTIMIZED 4 /*
126 * probe is really optimized.
127 * NOTE:
128 * this flag is only for optimized_kprobe.
129 */
ae6aa16f 130#define KPROBE_FLAG_FTRACE 8 /* probe is using ftrace */
e8386a0c 131
de5bd88d 132/* Has this kprobe gone ? */
e8386a0c
MH		 133static inline int kprobe_gone(struct kprobe *p)
134{
135 return p->flags & KPROBE_FLAG_GONE;
136}
137
de5bd88d
MH		 138/* Is this kprobe disabled ? */
139static inline int kprobe_disabled(struct kprobe *p)
140{
141 return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
142}
afd66255
MH		 143
144/* Is this kprobe really running optimized path ? */
145static inline int kprobe_optimized(struct kprobe *p)
146{
147 return p->flags & KPROBE_FLAG_OPTIMIZED;
148}
ae6aa16f
MH		 149
150/* Is this kprobe uses ftrace ? */
151static inline int kprobe_ftrace(struct kprobe *p)
152{
153 return p->flags & KPROBE_FLAG_FTRACE;
154}
155
1da177e4
LT		 156/*
157 * Special probe type that uses setjmp-longjmp type tricks to resume
158 * execution at a specified entry with a matching prototype corresponding
159 * to the probed function - a trick to enable arguments to become
160 * accessible seamlessly by probe handling logic.
161 * Note:
162 * Because of the way compilers allocate stack space for local variables
163 * etc upfront, regardless of sub-scopes within a function, this mirroring
164 * principle currently works only for probes placed on function entry points.
165 */
166struct jprobe {
167 struct kprobe kp;
81eae375 168 void *entry; /* probe handling code to jump to */
1da177e4
LT		 169};
170
9e367d85
ME		 171/* For backward compatibility with old code using JPROBE_ENTRY() */
172#define JPROBE_ENTRY(handler) (handler)
173
b94cce92
HN		 174/*
175 * Function-return probe -
176 * Note:
177 * User needs to provide a handler function, and initialize maxactive.
178 * maxactive - The maximum number of instances of the probed function that
179 * can be active concurrently.
180 * nmissed - tracks the number of times the probed function's return was
181 * ignored, due to maxactive being too low.
182 *
183 */
184struct kretprobe {
185 struct kprobe kp;
186 kretprobe_handler_t handler;
f47cd9b5 187 kretprobe_handler_t entry_handler;
b94cce92
HN		 188 int maxactive;
189 int nmissed;
f47cd9b5 190 size_t data_size;
b94cce92 191 struct hlist_head free_instances;
ec484608 192 raw_spinlock_t lock;
b94cce92
HN		 193};
194
195struct kretprobe_instance {
b94cce92
HN		 196 struct hlist_node hlist;
197 struct kretprobe *rp;
802eae7c
RL		 198 kprobe_opcode_t *ret_addr;
199 struct task_struct *task;
f47cd9b5 200 char data[0];
b94cce92
HN		 201};
202
f438d914
MH		 203struct kretprobe_blackpoint {
204 const char *name;
205 void *addr;
206};
3d8d996e
SD		 207
208struct kprobe_blackpoint {
209 const char *name;
210 unsigned long start_addr;
211 unsigned long range;
212};
213
dc19835d
MH		 214#ifdef CONFIG_KPROBES
215DECLARE_PER_CPU(struct kprobe *, current_kprobe);
216DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
217
b1801812
IM		 218/*
219 * For #ifdef avoidance:
220 */
221static inline int kprobes_built_in(void)
222{
223 return 1;
224}
225
dc19835d
MH		 226#ifdef CONFIG_KRETPROBES
227extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
228 struct pt_regs *regs);
229extern int arch_trampoline_kprobe(struct kprobe *p);
230#else /* CONFIG_KRETPROBES */
231static inline void arch_prepare_kretprobe(struct kretprobe *rp,
232 struct pt_regs *regs)
233{
234}
235static inline int arch_trampoline_kprobe(struct kprobe *p)
236{
237 return 0;
238}
239#endif /* CONFIG_KRETPROBES */
240
f438d914
MH		 241extern struct kretprobe_blackpoint kretprobe_blacklist[];
242
0f95b7fc
AM		 243static inline void kretprobe_assert(struct kretprobe_instance *ri,
244 unsigned long orig_ret_address, unsigned long trampoline_address)
245{
246 if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
247 printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
248 ri->rp, ri->rp->kp.addr);
249 BUG();
250 }
251}
252
8c1c9356
AM		 253#ifdef CONFIG_KPROBES_SANITY_TEST
254extern int init_test_probes(void);
255#else
256static inline int init_test_probes(void)
257{
258 return 0;
259}
260#endif /* CONFIG_KPROBES_SANITY_TEST */
261
1da177e4 262extern int arch_prepare_kprobe(struct kprobe *p);
7e1048b1
RL		 263extern void arch_arm_kprobe(struct kprobe *p);
264extern void arch_disarm_kprobe(struct kprobe *p);
6772926b 265extern int arch_init_kprobes(void);
1da177e4 266extern void show_registers(struct pt_regs *regs);
9ec4b1f3 267extern kprobe_opcode_t *get_insn_slot(void);
b4c6c34a 268extern void free_insn_slot(kprobe_opcode_t *slot, int dirty);
bf8d5c52 269extern void kprobes_inc_nmissed_count(struct kprobe *p);
1da177e4 270
afd66255
MH		 271#ifdef CONFIG_OPTPROBES
272/*
273 * Internal structure for direct jump optimized probe
274 */
275struct optimized_kprobe {
276 struct kprobe kp;
277 struct list_head list; /* list for optimizing queue */
278 struct arch_optimized_insn optinsn;
279};
280
281/* Architecture dependent functions for direct jump optimization */
282extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn);
283extern int arch_check_optimized_kprobe(struct optimized_kprobe *op);
284extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op);
285extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
cd7ebe22 286extern void arch_optimize_kprobes(struct list_head *oplist);
f984ba4e
MH		 287extern void arch_unoptimize_kprobes(struct list_head *oplist,
288 struct list_head *done_list);
afd66255
MH		 289extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
290extern kprobe_opcode_t *get_optinsn_slot(void);
291extern void free_optinsn_slot(kprobe_opcode_t *slot, int dirty);
292extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
293 unsigned long addr);
294
295extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs);
b2be84df
MH		 296
297#ifdef CONFIG_SYSCTL
298extern int sysctl_kprobes_optimization;
299extern int proc_kprobes_optimization_handler(struct ctl_table *table,
300 int write, void __user *buffer,
301 size_t *length, loff_t *ppos);
302#endif
303
afd66255 304#endif /* CONFIG_OPTPROBES */
e7dbfe34 305#ifdef CONFIG_KPROBES_ON_FTRACE
ae6aa16f 306extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
e5253896 307 struct ftrace_ops *ops, struct pt_regs *regs);
ae6aa16f
MH		 308extern int arch_prepare_kprobe_ftrace(struct kprobe *p);
309#endif
310
afd66255 311
d217d545 312/* Get the kprobe at this addr (if any) - called with preemption disabled */
1da177e4 313struct kprobe *get_kprobe(void *addr);
ef53d9c5
S		 314void kretprobe_hash_lock(struct task_struct *tsk,
315 struct hlist_head **head, unsigned long *flags);
316void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
b94cce92 317struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
1da177e4 318
e6584523
AM		 319/* kprobe_running() will just return the current_kprobe on this CPU */
320static inline struct kprobe *kprobe_running(void)
321{
b76834bc 322 return (__this_cpu_read(current_kprobe));
e6584523
AM		 323}
324
325static inline void reset_current_kprobe(void)
326{
b76834bc 327 __this_cpu_write(current_kprobe, NULL);
e6584523
AM		 328}
329
330static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
331{
332 return (&__get_cpu_var(kprobe_ctlblk));
333}
334
1da177e4
LT		 335int register_kprobe(struct kprobe *p);
336void unregister_kprobe(struct kprobe *p);
9861668f
MH		 337int register_kprobes(struct kprobe **kps, int num);
338void unregister_kprobes(struct kprobe **kps, int num);
1da177e4
LT		 339int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
340int longjmp_break_handler(struct kprobe *, struct pt_regs *);
341int register_jprobe(struct jprobe *p);
342void unregister_jprobe(struct jprobe *p);
26b31c19
MH		 343int register_jprobes(struct jprobe **jps, int num);
344void unregister_jprobes(struct jprobe **jps, int num);
1da177e4 345void jprobe_return(void);
3d7e3382 346unsigned long arch_deref_entry_point(void *);
1da177e4 347
b94cce92
HN		 348int register_kretprobe(struct kretprobe *rp);
349void unregister_kretprobe(struct kretprobe *rp);
4a296e07
MH		 350int register_kretprobes(struct kretprobe **rps, int num);
351void unregister_kretprobes(struct kretprobe **rps, int num);
b94cce92 352
b94cce92 353void kprobe_flush_task(struct task_struct *tk);
99219a3f 354void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
8c1c9356 355
de5bd88d
MH		 356int disable_kprobe(struct kprobe *kp);
357int enable_kprobe(struct kprobe *kp);
358
24851d24
FW		 359void dump_kprobe(struct kprobe *kp);
360
b1801812 361#else /* !CONFIG_KPROBES: */
00d7c05a 362
b1801812
IM		 363static inline int kprobes_built_in(void)
364{
365 return 0;
366}
367static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
368{
369 return 0;
370}
785656a4
AS		 371static inline struct kprobe *get_kprobe(void *addr)
372{
373 return NULL;
374}
e6584523 375static inline struct kprobe *kprobe_running(void)
1da177e4 376{
e6584523 377 return NULL;
1da177e4
LT		 378}
379static inline int register_kprobe(struct kprobe *p)
380{
381 return -ENOSYS;
382}
9861668f
MH		 383static inline int register_kprobes(struct kprobe **kps, int num)
384{
385 return -ENOSYS;
386}
1da177e4
LT		 387static inline void unregister_kprobe(struct kprobe *p)
388{
389}
9861668f
MH		 390static inline void unregister_kprobes(struct kprobe **kps, int num)
391{
392}
1da177e4
LT		 393static inline int register_jprobe(struct jprobe *p)
394{
395 return -ENOSYS;
396}
26b31c19
MH		 397static inline int register_jprobes(struct jprobe **jps, int num)
398{
399 return -ENOSYS;
400}
1da177e4
LT		 401static inline void unregister_jprobe(struct jprobe *p)
402{
403}
26b31c19
MH		 404static inline void unregister_jprobes(struct jprobe **jps, int num)
405{
406}
1da177e4
LT		 407static inline void jprobe_return(void)
408{
409}
b94cce92
HN		 410static inline int register_kretprobe(struct kretprobe *rp)
411{
412 return -ENOSYS;
413}
4a296e07
MH		 414static inline int register_kretprobes(struct kretprobe **rps, int num)
415{
416 return -ENOSYS;
417}
b94cce92
HN		 418static inline void unregister_kretprobe(struct kretprobe *rp)
419{
420}
4a296e07
MH		 421static inline void unregister_kretprobes(struct kretprobe **rps, int num)
422{
423}
b94cce92
HN		 424static inline void kprobe_flush_task(struct task_struct *tk)
425{
426}
de5bd88d
MH		 427static inline int disable_kprobe(struct kprobe *kp)
428{
429 return -ENOSYS;
430}
431static inline int enable_kprobe(struct kprobe *kp)
432{
433 return -ENOSYS;
434}
b1801812 435#endif /* CONFIG_KPROBES */
8f9b1528
MH		 436static inline int disable_kretprobe(struct kretprobe *rp)
437{
438 return disable_kprobe(&rp->kp);
439}
440static inline int enable_kretprobe(struct kretprobe *rp)
441{
442 return enable_kprobe(&rp->kp);
443}
444static inline int disable_jprobe(struct jprobe *jp)
445{
446 return disable_kprobe(&jp->kp);
447}
448static inline int enable_jprobe(struct jprobe *jp)
449{
450 return enable_kprobe(&jp->kp);
451}
452
b1801812 453#endif /* _LINUX_KPROBES_H */
kernel source for telekom puls (alcatel/mediatek)