[deliverable/linux.git] / include / asm-i386 / kprobes.h

#ifndef _ASM_KPROBES_H
#define _ASM_KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *  include/asm-i386/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).
 */
#include <linux/types.h>
#include <linux/ptrace.h>

#define  __ARCH_WANT_KPROBES_INSN_SLOT

struct kprobe;
struct pt_regs;

typedef u8 kprobe_opcode_t;
#define BREAKPOINT_INSTRUCTION	0xcc
#define RELATIVEJUMP_INSTRUCTION 0xe9
#define MAX_INSN_SIZE 16
#define MAX_STACK_SIZE 64
#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
	(((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
	? (MAX_STACK_SIZE) \
	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))

#define ARCH_SUPPORTS_KRETPROBES
#define  ARCH_INACTIVE_KPROBE_COUNT 0
#define flush_insn_slot(p)	do { } while (0)

void arch_remove_kprobe(struct kprobe *p);
void kretprobe_trampoline(void);

/* Architecture specific copy of original instruction*/
struct arch_specific_insn {
	/* copy of the original instruction */
	kprobe_opcode_t *insn;
	/*
	 * If this flag is not 0, this kprobe can be boost when its
	 * post_handler and break_handler is not set.
	 */
	int boostable;
};

struct prev_kprobe {
	struct kprobe *kp;
	unsigned long status;
	unsigned long old_eflags;
	unsigned long saved_eflags;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	unsigned long kprobe_old_eflags;
	unsigned long kprobe_saved_eflags;
	long *jprobe_saved_esp;
	struct pt_regs jprobe_saved_regs;
	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
	struct prev_kprobe prev_kprobe;
};

/* trap3/1 are intr gates for kprobes.  So, restore the status of IF,
 * if necessary, before executing the original int3/1 (trap) handler.
 */
static inline void restore_interrupts(struct pt_regs *regs)
{
	if (regs->eflags & IF_MASK)
		local_irq_enable();
}

extern int kprobe_exceptions_notify(struct notifier_block *self,
				    unsigned long val, void *data);
#endif				/* _ASM_KPROBES_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_KPROBES_H
	2	#define _ASM_KPROBES_H
	3	/*
	4	* Kernel Probes (KProbes)
	5	* include/asm-i386/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	*/
	27	#include <linux/types.h>
	28	#include <linux/ptrace.h>
	29
124d90be PP	30	#define __ARCH_WANT_KPROBES_INSN_SLOT
	31
	32	struct kprobe;
1da177e4 LT	33	struct pt_regs;
	34
	35	typedef u8 kprobe_opcode_t;
	36	#define BREAKPOINT_INSTRUCTION 0xcc
311ac88f	37	#define RELATIVEJUMP_INSTRUCTION 0xe9
1da177e4 LT	38	#define MAX_INSN_SIZE 16
	39	#define MAX_STACK_SIZE 64
	40	#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
	41	(((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
	42	? (MAX_STACK_SIZE) \
	43	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
	44
b94cce92	45	#define ARCH_SUPPORTS_KRETPROBES
e6f47f97	46	#define ARCH_INACTIVE_KPROBE_COUNT 0
a9ad965e	47	#define flush_insn_slot(p) do { } while (0)
b94cce92	48
124d90be	49	void arch_remove_kprobe(struct kprobe *p);
b94cce92	50	void kretprobe_trampoline(void);
1da177e4 LT	51
	52	/* Architecture specific copy of original instruction*/
	53	struct arch_specific_insn {
	54	/* copy of the original instruction */
124d90be	55	kprobe_opcode_t *insn;
311ac88f MH	56	/*
	57	* If this flag is not 0, this kprobe can be boost when its
	58	* post_handler and break_handler is not set.
	59	*/
	60	int boostable;
1da177e4 LT	61	};
1da177e4 LT	62
9a0e3a86 AM	63	struct prev_kprobe {
	64	struct kprobe *kp;
	65	unsigned long status;
	66	unsigned long old_eflags;
	67	unsigned long saved_eflags;
	68	};
	69
	70	/* per-cpu kprobe control block */
	71	struct kprobe_ctlblk {
	72	unsigned long kprobe_status;
	73	unsigned long kprobe_old_eflags;
	74	unsigned long kprobe_saved_eflags;
	75	long *jprobe_saved_esp;
	76	struct pt_regs jprobe_saved_regs;
	77	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
	78	struct prev_kprobe prev_kprobe;
	79	};
1da177e4 LT	80
	81	/* trap3/1 are intr gates for kprobes. So, restore the status of IF,
	82	* if necessary, before executing the original int3/1 (trap) handler.
	83	*/
	84	static inline void restore_interrupts(struct pt_regs *regs)
	85	{
	86	if (regs->eflags & IF_MASK)
	87	local_irq_enable();
	88	}
	89
1da177e4 LT	90	extern int kprobe_exceptions_notify(struct notifier_block *self,
1da177e4 LT	91	unsigned long val, void *data);
1da177e4	92	#endif /* _ASM_KPROBES_H */