[net-next-2.6.git] / include / linux / kprobes.h

#ifndef _LINUX_KPROBES_H
#define _LINUX_KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *  include/linux/kprobes.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2002, 2004
 *
 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 *		Probes initial implementation ( includes suggestions from
 *		Rusty Russell).
 * 2004-July	Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
 *		interface to access function arguments.
 * 2005-May	Hien Nguyen <hien@us.ibm.com> and Jim Keniston
 *		<jkenisto@us.ibm.com>  and Prasanna S Panchamukhi
 *		<prasanna@in.ibm.com> added function-return probes.
 */
#include <linux/linkage.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/mutex.h>

#ifdef CONFIG_KPROBES
#include <asm/kprobes.h>

/* kprobe_status settings */
#define KPROBE_HIT_ACTIVE	0x00000001
#define KPROBE_HIT_SS		0x00000002
#define KPROBE_REENTER		0x00000004
#define KPROBE_HIT_SSDONE	0x00000008

/* Attach to insert probes on any functions which should be ignored*/
#define __kprobes	__attribute__((__section__(".kprobes.text")))
#else /* CONFIG_KPROBES */
typedef int kprobe_opcode_t;
struct arch_specific_insn {
	int dummy;
};
#define __kprobes
#endif /* CONFIG_KPROBES */

struct kprobe;
struct pt_regs;
struct kretprobe;
struct kretprobe_instance;
typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
				       unsigned long flags);
typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
				       int trapnr);
typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
				    struct pt_regs *);

struct kprobe {
	struct hlist_node hlist;

	/* list of kprobes for multi-handler support */
	struct list_head list;

	/*count the number of times this probe was temporarily disarmed */
	unsigned long nmissed;

	/* location of the probe point */
	kprobe_opcode_t *addr;

	/* Allow user to indicate symbol name of the probe point */
	const char *symbol_name;

	/* Offset into the symbol */
	unsigned int offset;

	/* Called before addr is executed. */
	kprobe_pre_handler_t pre_handler;

	/* Called after addr is executed, unless... */
	kprobe_post_handler_t post_handler;

	/*
	 * ... called if executing addr causes a fault (eg. page fault).
	 * Return 1 if it handled fault, otherwise kernel will see it.
	 */
	kprobe_fault_handler_t fault_handler;

	/*
	 * ... called if breakpoint trap occurs in probe handler.
	 * Return 1 if it handled break, otherwise kernel will see it.
	 */
	kprobe_break_handler_t break_handler;

	/* Saved opcode (which has been replaced with breakpoint) */
	kprobe_opcode_t opcode;

	/* copy of the original instruction */
	struct arch_specific_insn ainsn;

	/*
	 * Indicates various status flags.
	 * Protected by kprobe_mutex after this kprobe is registered.
	 */
	u32 flags;
};

/* Kprobe status flags */
#define KPROBE_FLAG_GONE	1 /* breakpoint has already gone */
#define KPROBE_FLAG_DISABLED	2 /* probe is temporarily disabled */
#define KPROBE_FLAG_OPTIMIZED	4 /*
				   * probe is really optimized.
				   * NOTE:
				   * this flag is only for optimized_kprobe.
				   */

/* Has this kprobe gone ? */
static inline int kprobe_gone(struct kprobe *p)
{
	return p->flags & KPROBE_FLAG_GONE;
}

/* Is this kprobe disabled ? */
static inline int kprobe_disabled(struct kprobe *p)
{
	return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
}

/* Is this kprobe really running optimized path ? */
static inline int kprobe_optimized(struct kprobe *p)
{
	return p->flags & KPROBE_FLAG_OPTIMIZED;
}
/*
 * Special probe type that uses setjmp-longjmp type tricks to resume
 * execution at a specified entry with a matching prototype corresponding
 * to the probed function - a trick to enable arguments to become
 * accessible seamlessly by probe handling logic.
 * Note:
 * Because of the way compilers allocate stack space for local variables
 * etc upfront, regardless of sub-scopes within a function, this mirroring
 * principle currently works only for probes placed on function entry points.
 */
struct jprobe {
	struct kprobe kp;
	void *entry;	/* probe handling code to jump to */
};

/* For backward compatibility with old code using JPROBE_ENTRY() */
#define JPROBE_ENTRY(handler)	(handler)

/*
 * Function-return probe -
 * Note:
 * User needs to provide a handler function, and initialize maxactive.
 * maxactive - The maximum number of instances of the probed function that
 * can be active concurrently.
 * nmissed - tracks the number of times the probed function's return was
 * ignored, due to maxactive being too low.
 *
 */
struct kretprobe {
	struct kprobe kp;
	kretprobe_handler_t handler;
	kretprobe_handler_t entry_handler;
	int maxactive;
	int nmissed;
	size_t data_size;
	struct hlist_head free_instances;
	spinlock_t lock;
};

struct kretprobe_instance {
	struct hlist_node hlist;
	struct kretprobe *rp;
	kprobe_opcode_t *ret_addr;
	struct task_struct *task;
	char data[0];
};

struct kretprobe_blackpoint {
	const char *name;
	void *addr;
};

struct kprobe_blackpoint {
	const char *name;
	unsigned long start_addr;
	unsigned long range;
};

#ifdef CONFIG_KPROBES
DECLARE_PER_CPU(struct kprobe *, current_kprobe);
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);

/*
 * For #ifdef avoidance:
 */
static inline int kprobes_built_in(void)
{
	return 1;
}

#ifdef CONFIG_KRETPROBES
extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
				   struct pt_regs *regs);
extern int arch_trampoline_kprobe(struct kprobe *p);
#else /* CONFIG_KRETPROBES */
static inline void arch_prepare_kretprobe(struct kretprobe *rp,
					struct pt_regs *regs)
{
}
static inline int arch_trampoline_kprobe(struct kprobe *p)
{
	return 0;
}
#endif /* CONFIG_KRETPROBES */

extern struct kretprobe_blackpoint kretprobe_blacklist[];

static inline void kretprobe_assert(struct kretprobe_instance *ri,
	unsigned long orig_ret_address, unsigned long trampoline_address)
{
	if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
		printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
				ri->rp, ri->rp->kp.addr);
		BUG();
	}
}

#ifdef CONFIG_KPROBES_SANITY_TEST
extern int init_test_probes(void);
#else
static inline int init_test_probes(void)
{
	return 0;
}
#endif /* CONFIG_KPROBES_SANITY_TEST */

extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
extern void arch_disarm_kprobe(struct kprobe *p);
extern int arch_init_kprobes(void);
extern void show_registers(struct pt_regs *regs);
extern kprobe_opcode_t *get_insn_slot(void);
extern void free_insn_slot(kprobe_opcode_t *slot, int dirty);
extern void kprobes_inc_nmissed_count(struct kprobe *p);

#ifdef CONFIG_OPTPROBES
/*
 * Internal structure for direct jump optimized probe
 */
struct optimized_kprobe {
	struct kprobe kp;
	struct list_head list;	/* list for optimizing queue */
	struct arch_optimized_insn optinsn;
};

/* Architecture dependent functions for direct jump optimization */
extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn);
extern int arch_check_optimized_kprobe(struct optimized_kprobe *op);
extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op);
extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
extern int  arch_optimize_kprobe(struct optimized_kprobe *op);
extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
extern kprobe_opcode_t *get_optinsn_slot(void);
extern void free_optinsn_slot(kprobe_opcode_t *slot, int dirty);
extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
					unsigned long addr);

extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs);

#ifdef CONFIG_SYSCTL
extern int sysctl_kprobes_optimization;
extern int proc_kprobes_optimization_handler(struct ctl_table *table,
					     int write, void __user *buffer,
					     size_t *length, loff_t *ppos);
#endif

#endif /* CONFIG_OPTPROBES */

/* Get the kprobe at this addr (if any) - called with preemption disabled */
struct kprobe *get_kprobe(void *addr);
void kretprobe_hash_lock(struct task_struct *tsk,
			 struct hlist_head **head, unsigned long *flags);
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);

/* kprobe_running() will just return the current_kprobe on this CPU */
static inline struct kprobe *kprobe_running(void)
{
	return (__get_cpu_var(current_kprobe));
}

static inline void reset_current_kprobe(void)
{
	__get_cpu_var(current_kprobe) = NULL;
}

static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
{
	return (&__get_cpu_var(kprobe_ctlblk));
}

int register_kprobe(struct kprobe *p);
void unregister_kprobe(struct kprobe *p);
int register_kprobes(struct kprobe **kps, int num);
void unregister_kprobes(struct kprobe **kps, int num);
int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
int longjmp_break_handler(struct kprobe *, struct pt_regs *);
int register_jprobe(struct jprobe *p);
void unregister_jprobe(struct jprobe *p);
int register_jprobes(struct jprobe **jps, int num);
void unregister_jprobes(struct jprobe **jps, int num);
void jprobe_return(void);
unsigned long arch_deref_entry_point(void *);

int register_kretprobe(struct kretprobe *rp);
void unregister_kretprobe(struct kretprobe *rp);
int register_kretprobes(struct kretprobe **rps, int num);
void unregister_kretprobes(struct kretprobe **rps, int num);

void kprobe_flush_task(struct task_struct *tk);
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);

int disable_kprobe(struct kprobe *kp);
int enable_kprobe(struct kprobe *kp);

void dump_kprobe(struct kprobe *kp);

#else /* !CONFIG_KPROBES: */

static inline int kprobes_built_in(void)
{
	return 0;
}
static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
	return 0;
}
static inline struct kprobe *get_kprobe(void *addr)
{
	return NULL;
}
static inline struct kprobe *kprobe_running(void)
{
	return NULL;
}
static inline int register_kprobe(struct kprobe *p)
{
	return -ENOSYS;
}
static inline int register_kprobes(struct kprobe **kps, int num)
{
	return -ENOSYS;
}
static inline void unregister_kprobe(struct kprobe *p)
{
}
static inline void unregister_kprobes(struct kprobe **kps, int num)
{
}
static inline int register_jprobe(struct jprobe *p)
{
	return -ENOSYS;
}
static inline int register_jprobes(struct jprobe **jps, int num)
{
	return -ENOSYS;
}
static inline void unregister_jprobe(struct jprobe *p)
{
}
static inline void unregister_jprobes(struct jprobe **jps, int num)
{
}
static inline void jprobe_return(void)
{
}
static inline int register_kretprobe(struct kretprobe *rp)
{
	return -ENOSYS;
}
static inline int register_kretprobes(struct kretprobe **rps, int num)
{
	return -ENOSYS;
}
static inline void unregister_kretprobe(struct kretprobe *rp)
{
}
static inline void unregister_kretprobes(struct kretprobe **rps, int num)
{
}
static inline void kprobe_flush_task(struct task_struct *tk)
{
}
static inline int disable_kprobe(struct kprobe *kp)
{
	return -ENOSYS;
}
static inline int enable_kprobe(struct kprobe *kp)
{
	return -ENOSYS;
}
#endif /* CONFIG_KPROBES */
static inline int disable_kretprobe(struct kretprobe *rp)
{
	return disable_kprobe(&rp->kp);
}
static inline int enable_kretprobe(struct kretprobe *rp)
{
	return enable_kprobe(&rp->kp);
}
static inline int disable_jprobe(struct jprobe *jp)
{
	return disable_kprobe(&jp->kp);
}
static inline int enable_jprobe(struct jprobe *jp)
{
	return enable_kprobe(&jp->kp);
}

#endif /* _LINUX_KPROBES_H */
Commit	Line	Data
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	*/
36dcd67a	32	#include <linux/linkage.h>
1da177e4 LT	33	#include <linux/list.h>
	34	#include <linux/notifier.h>
	35	#include <linux/smp.h>
e6584523	36	#include <linux/percpu.h>
3516a460 AM	37	#include <linux/spinlock.h>
3516a460 AM	38	#include <linux/rcupdate.h>
7a7d1cf9	39	#include <linux/mutex.h>
b94cce92	40
00d7c05a	41	#ifdef CONFIG_KPROBES
1da177e4 LT	42	#include <asm/kprobes.h>
1da177e4 LT	43
ea32c65c PP	44	/* kprobe_status settings */
	45	#define KPROBE_HIT_ACTIVE 0x00000001
	46	#define KPROBE_HIT_SS 0x00000002
	47	#define KPROBE_REENTER 0x00000004
	48	#define KPROBE_HIT_SSDONE 0x00000008
	49
d0aaff97	50	/* Attach to insert probes on any functions which should be ignored*/
fe832a3a	51	#define __kprobes __attribute__((__section__(".kprobes.text")))
dc19835d MH	52	#else /* CONFIG_KPROBES */
	53	typedef int kprobe_opcode_t;
	54	struct arch_specific_insn {
	55	int dummy;
	56	};
fe832a3a	57	#define __kprobes
dc19835d	58	#endif /* CONFIG_KPROBES */
d0aaff97	59
1da177e4 LT	60	struct kprobe;
1da177e4 LT	61	struct pt_regs;
b94cce92 HN	62	struct kretprobe;
b94cce92 HN	63	struct kretprobe_instance;
1da177e4 LT	64	typedef int (kprobe_pre_handler_t) (struct kprobe , struct pt_regs *);
	65	typedef int (kprobe_break_handler_t) (struct kprobe , struct pt_regs *);
	66	typedef void (kprobe_post_handler_t) (struct kprobe , struct pt_regs *,
	67	unsigned long flags);
	68	typedef int (kprobe_fault_handler_t) (struct kprobe , struct pt_regs *,
	69	int trapnr);
b94cce92 HN	70	typedef int (kretprobe_handler_t) (struct kretprobe_instance ,
	71	struct pt_regs *);
	72
1da177e4 LT	73	struct 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;
1da177e4 LT	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	};
1da177e4 LT	121
e8386a0c MH	122	/* Kprobe status flags */
e8386a0c MH	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	*/
e8386a0c	130
de5bd88d	131	/* Has this kprobe gone ? */
e8386a0c MH	132	static inline int kprobe_gone(struct kprobe *p)
	133	{
	134	return p->flags & KPROBE_FLAG_GONE;
	135	}
	136
de5bd88d MH	137	/* Is this kprobe disabled ? */
	138	static inline int kprobe_disabled(struct kprobe *p)
	139	{
	140	return p->flags & (KPROBE_FLAG_DISABLED \| KPROBE_FLAG_GONE);
	141	}
afd66255 MH	142
	143	/* Is this kprobe really running optimized path ? */
	144	static inline int kprobe_optimized(struct kprobe *p)
	145	{
	146	return p->flags & KPROBE_FLAG_OPTIMIZED;
	147	}
1da177e4 LT	148	/*
	149	* Special probe type that uses setjmp-longjmp type tricks to resume
	150	* execution at a specified entry with a matching prototype corresponding
	151	* to the probed function - a trick to enable arguments to become
	152	* accessible seamlessly by probe handling logic.
	153	* Note:
	154	* Because of the way compilers allocate stack space for local variables
	155	* etc upfront, regardless of sub-scopes within a function, this mirroring
	156	* principle currently works only for probes placed on function entry points.
	157	*/
	158	struct jprobe {
	159	struct kprobe kp;
81eae375	160	void entry; / probe handling code to jump to */
1da177e4 LT	161	};
1da177e4 LT	162
9e367d85 ME	163	/* For backward compatibility with old code using JPROBE_ENTRY() */
	164	#define JPROBE_ENTRY(handler) (handler)
	165
b94cce92 HN	166	/*
	167	* Function-return probe -
	168	* Note:
	169	* User needs to provide a handler function, and initialize maxactive.
	170	* maxactive - The maximum number of instances of the probed function that
	171	* can be active concurrently.
	172	* nmissed - tracks the number of times the probed function's return was
	173	* ignored, due to maxactive being too low.
	174	*
	175	*/
	176	struct kretprobe {
	177	struct kprobe kp;
	178	kretprobe_handler_t handler;
f47cd9b5	179	kretprobe_handler_t entry_handler;
b94cce92 HN	180	int maxactive;
b94cce92 HN	181	int nmissed;
f47cd9b5	182	size_t data_size;
b94cce92	183	struct hlist_head free_instances;
ef53d9c5	184	spinlock_t lock;
b94cce92 HN	185	};
	186
	187	struct kretprobe_instance {
b94cce92 HN	188	struct hlist_node hlist;
b94cce92 HN	189	struct kretprobe *rp;
802eae7c RL	190	kprobe_opcode_t *ret_addr;
802eae7c RL	191	struct task_struct *task;
f47cd9b5	192	char data[0];
b94cce92 HN	193	};
b94cce92 HN	194
f438d914 MH	195	struct kretprobe_blackpoint {
	196	const char *name;
	197	void *addr;
	198	};
3d8d996e SD	199
	200	struct kprobe_blackpoint {
	201	const char *name;
	202	unsigned long start_addr;
	203	unsigned long range;
	204	};
	205
dc19835d MH	206	#ifdef CONFIG_KPROBES
	207	DECLARE_PER_CPU(struct kprobe *, current_kprobe);
	208	DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
	209
b1801812 IM	210	/*
	211	* For #ifdef avoidance:
	212	*/
	213	static inline int kprobes_built_in(void)
	214	{
	215	return 1;
	216	}
	217
dc19835d MH	218	#ifdef CONFIG_KRETPROBES
	219	extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
	220	struct pt_regs *regs);
	221	extern int arch_trampoline_kprobe(struct kprobe *p);
	222	#else /* CONFIG_KRETPROBES */
	223	static inline void arch_prepare_kretprobe(struct kretprobe *rp,
	224	struct pt_regs *regs)
	225	{
	226	}
	227	static inline int arch_trampoline_kprobe(struct kprobe *p)
	228	{
	229	return 0;
	230	}
	231	#endif /* CONFIG_KRETPROBES */
	232
f438d914 MH	233	extern struct kretprobe_blackpoint kretprobe_blacklist[];
f438d914 MH	234
0f95b7fc AM	235	static inline void kretprobe_assert(struct kretprobe_instance *ri,
	236	unsigned long orig_ret_address, unsigned long trampoline_address)
	237	{
	238	if (!orig_ret_address \|\| (orig_ret_address == trampoline_address)) {
	239	printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
	240	ri->rp, ri->rp->kp.addr);
	241	BUG();
	242	}
	243	}
	244
8c1c9356 AM	245	#ifdef CONFIG_KPROBES_SANITY_TEST
	246	extern int init_test_probes(void);
	247	#else
	248	static inline int init_test_probes(void)
	249	{
	250	return 0;
	251	}
	252	#endif /* CONFIG_KPROBES_SANITY_TEST */
	253
1da177e4	254	extern int arch_prepare_kprobe(struct kprobe *p);
7e1048b1 RL	255	extern void arch_arm_kprobe(struct kprobe *p);
7e1048b1 RL	256	extern void arch_disarm_kprobe(struct kprobe *p);
6772926b	257	extern int arch_init_kprobes(void);
1da177e4	258	extern void show_registers(struct pt_regs *regs);
9ec4b1f3	259	extern kprobe_opcode_t *get_insn_slot(void);
b4c6c34a	260	extern void free_insn_slot(kprobe_opcode_t *slot, int dirty);
bf8d5c52	261	extern void kprobes_inc_nmissed_count(struct kprobe *p);
1da177e4	262
afd66255 MH	263	#ifdef CONFIG_OPTPROBES
	264	/*
	265	* Internal structure for direct jump optimized probe
	266	*/
	267	struct optimized_kprobe {
	268	struct kprobe kp;
	269	struct list_head list; /* list for optimizing queue */
	270	struct arch_optimized_insn optinsn;
	271	};
	272
	273	/* Architecture dependent functions for direct jump optimization */
	274	extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn);
	275	extern int arch_check_optimized_kprobe(struct optimized_kprobe *op);
	276	extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op);
	277	extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
	278	extern int arch_optimize_kprobe(struct optimized_kprobe *op);
	279	extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
	280	extern kprobe_opcode_t *get_optinsn_slot(void);
	281	extern void free_optinsn_slot(kprobe_opcode_t *slot, int dirty);
	282	extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
	283	unsigned long addr);
	284
	285	extern void opt_pre_handler(struct kprobe p, struct pt_regs regs);
b2be84df MH	286
	287	#ifdef CONFIG_SYSCTL
	288	extern int sysctl_kprobes_optimization;
	289	extern int proc_kprobes_optimization_handler(struct ctl_table *table,
	290	int write, void __user *buffer,
	291	size_t length, loff_t ppos);
	292	#endif
	293
afd66255 MH	294	#endif /* CONFIG_OPTPROBES */
afd66255 MH	295
d217d545	296	/* Get the kprobe at this addr (if any) - called with preemption disabled */
1da177e4	297	struct kprobe get_kprobe(void addr);
ef53d9c5 S	298	void kretprobe_hash_lock(struct task_struct *tsk,
	299	struct hlist_head *head, unsigned long flags);
	300	void kretprobe_hash_unlock(struct task_struct tsk, unsigned long flags);
b94cce92	301	struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
1da177e4	302
e6584523 AM	303	/* kprobe_running() will just return the current_kprobe on this CPU */
	304	static inline struct kprobe *kprobe_running(void)
	305	{
	306	return (__get_cpu_var(current_kprobe));
	307	}
	308
	309	static inline void reset_current_kprobe(void)
	310	{
	311	__get_cpu_var(current_kprobe) = NULL;
	312	}
	313
	314	static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
	315	{
	316	return (&__get_cpu_var(kprobe_ctlblk));
	317	}
	318
1da177e4 LT	319	int register_kprobe(struct kprobe *p);
1da177e4 LT	320	void unregister_kprobe(struct kprobe *p);
9861668f MH	321	int register_kprobes(struct kprobe **kps, int num);
9861668f MH	322	void unregister_kprobes(struct kprobe **kps, int num);
1da177e4 LT	323	int setjmp_pre_handler(struct kprobe , struct pt_regs );
	324	int longjmp_break_handler(struct kprobe , struct pt_regs );
	325	int register_jprobe(struct jprobe *p);
	326	void unregister_jprobe(struct jprobe *p);
26b31c19 MH	327	int register_jprobes(struct jprobe **jps, int num);
26b31c19 MH	328	void unregister_jprobes(struct jprobe **jps, int num);
1da177e4	329	void jprobe_return(void);
3d7e3382	330	unsigned long arch_deref_entry_point(void *);
1da177e4	331
b94cce92 HN	332	int register_kretprobe(struct kretprobe *rp);
b94cce92 HN	333	void unregister_kretprobe(struct kretprobe *rp);
4a296e07 MH	334	int register_kretprobes(struct kretprobe **rps, int num);
4a296e07 MH	335	void unregister_kretprobes(struct kretprobe **rps, int num);
b94cce92	336
b94cce92	337	void kprobe_flush_task(struct task_struct *tk);
99219a3f	338	void recycle_rp_inst(struct kretprobe_instance ri, struct hlist_head head);
8c1c9356	339
de5bd88d MH	340	int disable_kprobe(struct kprobe *kp);
	341	int enable_kprobe(struct kprobe *kp);
	342
24851d24 FW	343	void dump_kprobe(struct kprobe *kp);
24851d24 FW	344
b1801812	345	#else /* !CONFIG_KPROBES: */
00d7c05a	346
b1801812 IM	347	static inline int kprobes_built_in(void)
	348	{
	349	return 0;
	350	}
	351	static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
	352	{
	353	return 0;
	354	}
785656a4 AS	355	static inline struct kprobe get_kprobe(void addr)
	356	{
	357	return NULL;
	358	}
e6584523	359	static inline struct kprobe *kprobe_running(void)
1da177e4	360	{
e6584523	361	return NULL;
1da177e4 LT	362	}
	363	static inline int register_kprobe(struct kprobe *p)
	364	{
	365	return -ENOSYS;
	366	}
9861668f MH	367	static inline int register_kprobes(struct kprobe **kps, int num)
	368	{
	369	return -ENOSYS;
	370	}
1da177e4 LT	371	static inline void unregister_kprobe(struct kprobe *p)
	372	{
	373	}
9861668f MH	374	static inline void unregister_kprobes(struct kprobe **kps, int num)
	375	{
	376	}
1da177e4 LT	377	static inline int register_jprobe(struct jprobe *p)
	378	{
	379	return -ENOSYS;
	380	}
26b31c19 MH	381	static inline int register_jprobes(struct jprobe **jps, int num)
	382	{
	383	return -ENOSYS;
	384	}
1da177e4 LT	385	static inline void unregister_jprobe(struct jprobe *p)
	386	{
	387	}
26b31c19 MH	388	static inline void unregister_jprobes(struct jprobe **jps, int num)
	389	{
	390	}
1da177e4 LT	391	static inline void jprobe_return(void)
	392	{
	393	}
b94cce92 HN	394	static inline int register_kretprobe(struct kretprobe *rp)
	395	{
	396	return -ENOSYS;
	397	}
4a296e07 MH	398	static inline int register_kretprobes(struct kretprobe **rps, int num)
	399	{
	400	return -ENOSYS;
	401	}
b94cce92 HN	402	static inline void unregister_kretprobe(struct kretprobe *rp)
	403	{
	404	}
4a296e07 MH	405	static inline void unregister_kretprobes(struct kretprobe **rps, int num)
	406	{
	407	}
b94cce92 HN	408	static inline void kprobe_flush_task(struct task_struct *tk)
	409	{
	410	}
de5bd88d MH	411	static inline int disable_kprobe(struct kprobe *kp)
	412	{
	413	return -ENOSYS;
	414	}
	415	static inline int enable_kprobe(struct kprobe *kp)
	416	{
	417	return -ENOSYS;
	418	}
b1801812	419	#endif /* CONFIG_KPROBES */
8f9b1528 MH	420	static inline int disable_kretprobe(struct kretprobe *rp)
	421	{
	422	return disable_kprobe(&rp->kp);
	423	}
	424	static inline int enable_kretprobe(struct kretprobe *rp)
	425	{
	426	return enable_kprobe(&rp->kp);
	427	}
	428	static inline int disable_jprobe(struct jprobe *jp)
	429	{
	430	return disable_kprobe(&jp->kp);
	431	}
	432	static inline int enable_jprobe(struct jprobe *jp)
	433	{
	434	return enable_kprobe(&jp->kp);
	435	}
	436
b1801812	437	#endif /* _LINUX_KPROBES_H */