[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-x86 / kprobes.h

#ifndef ASM_X86__KPROBES_H
#define ASM_X86__KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *
 * 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
 *
 * See arch/x86/kernel/kprobes.c for x86 kprobes history.
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>

#define  __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

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 - (unsigned long)(ADDR)))    \
	 ? (MAX_STACK_SIZE)					       \
	 : (((unsigned long)current_thread_info()) +		       \
	    THREAD_SIZE - (unsigned long)(ADDR)))

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

extern const int kretprobe_blacklist_size;

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;
	/*
	 * boostable = -1: This instruction type is not boostable.
	 * boostable = 0: This instruction type is boostable.
	 * boostable = 1: This instruction has been boosted: we have
	 * added a relative jump after the instruction copy in insn,
	 * so no single-step and fixup are needed (unless there's
	 * a post_handler or break_handler).
	 */
	int boostable;
};

struct prev_kprobe {
	struct kprobe *kp;
	unsigned long status;
	unsigned long old_flags;
	unsigned long saved_flags;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	unsigned long kprobe_old_flags;
	unsigned long kprobe_saved_flags;
	unsigned long *jprobe_saved_sp;
	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->flags & X86_EFLAGS_IF)
		local_irq_enable();
}

extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
extern int kprobe_exceptions_notify(struct notifier_block *self,
				    unsigned long val, void *data);
#endif /* ASM_X86__KPROBES_H */
Commit	Line	Data
77ef50a5 VN	1	#ifndef ASM_X86__KPROBES_H
77ef50a5 VN	2	#define ASM_X86__KPROBES_H
d6be29b8 MH	3	/*
	4	* Kernel Probes (KProbes)
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	19	*
	20	* Copyright (C) IBM Corporation, 2002, 2004
	21	*
	22	* See arch/x86/kernel/kprobes.c for x86 kprobes history.
	23	*/
	24	#include <linux/types.h>
	25	#include <linux/ptrace.h>
	26	#include <linux/percpu.h>
	27
	28	#define __ARCH_WANT_KPROBES_INSN_SLOT
	29
	30	struct pt_regs;
	31	struct kprobe;
	32
	33	typedef u8 kprobe_opcode_t;
	34	#define BREAKPOINT_INSTRUCTION 0xcc
	35	#define RELATIVEJUMP_INSTRUCTION 0xe9
	36	#define MAX_INSN_SIZE 16
	37	#define MAX_STACK_SIZE 64
864dfa13 JP	38	#define MIN_STACK_SIZE(ADDR) \
	39	(((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \
	40	THREAD_SIZE - (unsigned long)(ADDR))) \
	41	? (MAX_STACK_SIZE) \
	42	: (((unsigned long)current_thread_info()) + \
	43	THREAD_SIZE - (unsigned long)(ADDR)))
d6be29b8	44
d6be29b8 MH	45	#define flush_insn_slot(p) do { } while (0)
	46
	47	extern const int kretprobe_blacklist_size;
	48
	49	void arch_remove_kprobe(struct kprobe *p);
	50	void kretprobe_trampoline(void);
	51
	52	/* Architecture specific copy of original instruction*/
	53	struct arch_specific_insn {
	54	/* copy of the original instruction */
	55	kprobe_opcode_t *insn;
	56	/*
	57	* boostable = -1: This instruction type is not boostable.
	58	* boostable = 0: This instruction type is boostable.
	59	* boostable = 1: This instruction has been boosted: we have
	60	* added a relative jump after the instruction copy in insn,
	61	* so no single-step and fixup are needed (unless there's
	62	* a post_handler or break_handler).
	63	*/
	64	int boostable;
	65	};
	66
	67	struct prev_kprobe {
	68	struct kprobe *kp;
	69	unsigned long status;
	70	unsigned long old_flags;
	71	unsigned long saved_flags;
	72	};
	73
	74	/* per-cpu kprobe control block */
	75	struct kprobe_ctlblk {
	76	unsigned long kprobe_status;
	77	unsigned long kprobe_old_flags;
	78	unsigned long kprobe_saved_flags;
	79	unsigned long *jprobe_saved_sp;
	80	struct pt_regs jprobe_saved_regs;
	81	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
	82	struct prev_kprobe prev_kprobe;
	83	};
	84
	85	/* trap3/1 are intr gates for kprobes. So, restore the status of IF,
	86	* if necessary, before executing the original int3/1 (trap) handler.
	87	*/
	88	static inline void restore_interrupts(struct pt_regs *regs)
	89	{
053de044	90	if (regs->flags & X86_EFLAGS_IF)
d6be29b8 MH	91	local_irq_enable();
	92	}
	93
	94	extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
	95	extern int kprobe_exceptions_notify(struct notifier_block *self,
	96	unsigned long val, void *data);
77ef50a5	97	#endif /* ASM_X86__KPROBES_H */