include/linux/kprobes.h - kernel/msm-4.19 - Gitiles

 #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/compiler.h>
 #include <linux/linkage.h>
 #include <linux/list.h>
 #include <linux/notifier.h>
 #include <linux/smp.h>
 #include <linux/bug.h>
 #include <linux/percpu.h>
 #include <linux/spinlock.h>
 #include <linux/rcupdate.h>
 #include <linux/mutex.h>
 #include <linux/ftrace.h>
 #include <asm/kprobes.h>

 #ifdef CONFIG_KPROBES

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

 #else /* CONFIG_KPROBES */
 #include <asm-generic/kprobes.h>
 typedef int kprobe_opcode_t;
 struct arch_specific_insn {
 	int dummy;
 };
 #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 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;

 	/* 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.
 				   */
 #define KPROBE_FLAG_FTRACE	8 /* probe is using ftrace */

 /* 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;
 }

 /* Is this kprobe uses ftrace ? */
 static inline int kprobe_ftrace(struct kprobe *p)
 {
 	return p->flags & KPROBE_FLAG_FTRACE;
 }

 /*
  * 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;
 	raw_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_blacklist_entry {
 	struct list_head list;
 	unsigned long start_addr;
 	unsigned long end_addr;
 };

 #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 void kprobes_inc_nmissed_count(struct kprobe *p);
 extern bool arch_within_kprobe_blacklist(unsigned long addr);
 extern bool arch_kprobe_on_func_entry(unsigned long offset);
 extern bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset);

 extern bool within_kprobe_blacklist(unsigned long addr);

 struct kprobe_insn_cache {
 	struct mutex mutex;
 	void *(*alloc)(void);	/* allocate insn page */
 	void (*free)(void *);	/* free insn page */
 	struct list_head pages; /* list of kprobe_insn_page */
 	size_t insn_size;	/* size of instruction slot */
 	int nr_garbage;
 };

 #ifdef __ARCH_WANT_KPROBES_INSN_SLOT
 extern kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c);
 extern void __free_insn_slot(struct kprobe_insn_cache *c,
 			     kprobe_opcode_t *slot, int dirty);
 /* sleep-less address checking routine  */
 extern bool __is_insn_slot_addr(struct kprobe_insn_cache *c,
 				unsigned long addr);

 #define DEFINE_INSN_CACHE_OPS(__name)					\
 extern struct kprobe_insn_cache kprobe_##__name##_slots;		\
 									\
 static inline kprobe_opcode_t *get_##__name##_slot(void)		\
 {									\
 	return __get_insn_slot(&kprobe_##__name##_slots);		\
 }									\
 									\
 static inline void free_##__name##_slot(kprobe_opcode_t *slot, int dirty)\
 {									\
 	__free_insn_slot(&kprobe_##__name##_slots, slot, dirty);	\
 }									\
 									\
 static inline bool is_kprobe_##__name##_slot(unsigned long addr)	\
 {									\
 	return __is_insn_slot_addr(&kprobe_##__name##_slots, addr);	\
 }
 #else /* __ARCH_WANT_KPROBES_INSN_SLOT */
 #define DEFINE_INSN_CACHE_OPS(__name)					\
 static inline bool is_kprobe_##__name##_slot(unsigned long addr)	\
 {									\
 	return 0;							\
 }
 #endif

 DEFINE_INSN_CACHE_OPS(insn);

 #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,
 					 struct kprobe *orig);
 extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
 extern void arch_optimize_kprobes(struct list_head *oplist);
 extern void arch_unoptimize_kprobes(struct list_head *oplist,
 				    struct list_head *done_list);
 extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
 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);

 DEFINE_INSN_CACHE_OPS(optinsn);

 #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
 extern void wait_for_kprobe_optimizer(void);
 #else
 static inline void wait_for_kprobe_optimizer(void) { }
 #endif /* CONFIG_OPTPROBES */
 #ifdef CONFIG_KPROBES_ON_FTRACE
 extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 				  struct ftrace_ops *ops, struct pt_regs *regs);
 extern int arch_prepare_kprobe_ftrace(struct kprobe *p);
 #endif

 int arch_check_ftrace_location(struct kprobe *p);

 /* 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 (__this_cpu_read(current_kprobe));
 }

 static inline void reset_current_kprobe(void)
 {
 	__this_cpu_write(current_kprobe, NULL);
 }

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

 kprobe_opcode_t *kprobe_lookup_name(const char *name, unsigned int offset);
 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);
 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_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);
 }

 #ifndef CONFIG_KPROBES
 static inline bool is_kprobe_insn_slot(unsigned long addr)
 {
 	return false;
 }
 #endif
 #ifndef CONFIG_OPTPROBES
 static inline bool is_kprobe_optinsn_slot(unsigned long addr)
 {
 	return false;
 }
 #endif

 #endif /* _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/compiler.h>
	#include <linux/linkage.h>
	#include <linux/list.h>
	#include <linux/notifier.h>
	#include <linux/smp.h>
	#include <linux/bug.h>
	#include <linux/percpu.h>
	#include <linux/spinlock.h>
	#include <linux/rcupdate.h>
	#include <linux/mutex.h>
	#include <linux/ftrace.h>
	#include <asm/kprobes.h>

	#ifdef CONFIG_KPROBES

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

	#else /* CONFIG_KPROBES */
	#include <asm-generic/kprobes.h>
	typedef int kprobe_opcode_t;
	struct arch_specific_insn {
	int dummy;
	};
	#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 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;

	/* 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.
	*/
	#define KPROBE_FLAG_FTRACE 8 /* probe is using ftrace */

	/* 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;
	}

	/* Is this kprobe uses ftrace ? */
	static inline int kprobe_ftrace(struct kprobe *p)
	{
	return p->flags & KPROBE_FLAG_FTRACE;
	}

	/*
	* 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;
	raw_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_blacklist_entry {
	struct list_head list;
	unsigned long start_addr;
	unsigned long end_addr;
	};

	#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 void kprobes_inc_nmissed_count(struct kprobe *p);
	extern bool arch_within_kprobe_blacklist(unsigned long addr);
	extern bool arch_kprobe_on_func_entry(unsigned long offset);
	extern bool kprobe_on_func_entry(kprobe_opcode_t addr, const char sym, unsigned long offset);

	extern bool within_kprobe_blacklist(unsigned long addr);

	struct kprobe_insn_cache {
	struct mutex mutex;
	void (alloc)(void); /* allocate insn page */
	void (free)(void ); /* free insn page */
	struct list_head pages; /* list of kprobe_insn_page */
	size_t insn_size; /* size of instruction slot */
	int nr_garbage;
	};

	#ifdef __ARCH_WANT_KPROBES_INSN_SLOT
	extern kprobe_opcode_t __get_insn_slot(struct kprobe_insn_cache c);
	extern void __free_insn_slot(struct kprobe_insn_cache *c,
	kprobe_opcode_t *slot, int dirty);
	/* sleep-less address checking routine */
	extern bool __is_insn_slot_addr(struct kprobe_insn_cache *c,
	unsigned long addr);

	#define DEFINE_INSN_CACHE_OPS(__name) \
	extern struct kprobe_insn_cache kprobe_##__name##_slots; \
	\
	static inline kprobe_opcode_t *get_##__name##_slot(void) \
	{ \
	return __get_insn_slot(&kprobe_##__name##_slots); \
	} \
	\
	static inline void free_##__name##_slot(kprobe_opcode_t *slot, int dirty)\
	{ \
	__free_insn_slot(&kprobe_##__name##_slots, slot, dirty); \
	} \
	\
	static inline bool is_kprobe_##__name##_slot(unsigned long addr) \
	{ \
	return __is_insn_slot_addr(&kprobe_##__name##_slots, addr); \
	}
	#else /* __ARCH_WANT_KPROBES_INSN_SLOT */
	#define DEFINE_INSN_CACHE_OPS(__name) \
	static inline bool is_kprobe_##__name##_slot(unsigned long addr) \
	{ \
	return 0; \
	}
	#endif

	DEFINE_INSN_CACHE_OPS(insn);

	#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,
	struct kprobe *orig);
	extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
	extern void arch_optimize_kprobes(struct list_head *oplist);
	extern void arch_unoptimize_kprobes(struct list_head *oplist,
	struct list_head *done_list);
	extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
	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);

	DEFINE_INSN_CACHE_OPS(optinsn);

	#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
	extern void wait_for_kprobe_optimizer(void);
	#else
	static inline void wait_for_kprobe_optimizer(void) { }
	#endif /* CONFIG_OPTPROBES */
	#ifdef CONFIG_KPROBES_ON_FTRACE
	extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
	struct ftrace_ops ops, struct pt_regs regs);
	extern int arch_prepare_kprobe_ftrace(struct kprobe *p);
	#endif

	int arch_check_ftrace_location(struct kprobe *p);

	/* 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 (__this_cpu_read(current_kprobe));
	}

	static inline void reset_current_kprobe(void)
	{
	__this_cpu_write(current_kprobe, NULL);
	}

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

	kprobe_opcode_t kprobe_lookup_name(const char name, unsigned int offset);
	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);
	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_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);
	}

	#ifndef CONFIG_KPROBES
	static inline bool is_kprobe_insn_slot(unsigned long addr)
	{
	return false;
	}
	#endif
	#ifndef CONFIG_OPTPROBES
	static inline bool is_kprobe_optinsn_slot(unsigned long addr)
	{
	return false;
	}
	#endif

	#endif /* _LINUX_KPROBES_H */