[deliverable/linux.git] / arch / x86 / include / asm / jump_label.h

#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H

#ifdef __KERNEL__

#include <linux/types.h>
#include <asm/nops.h>

#define JUMP_LABEL_NOP_SIZE 5

# define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"

# define JUMP_LABEL(key, label)					\
	do {							\
		asm goto("1:"					\
			JUMP_LABEL_INITIAL_NOP			\
			".pushsection __jump_table,  \"aw\" \n\t"\
			_ASM_PTR "1b, %l[" #label "], %c0 \n\t" \
			".popsection \n\t"			\
			: :  "i" (key) :  : label);		\
	} while (0)

#endif /* __KERNEL__ */

#ifdef CONFIG_X86_64
typedef u64 jump_label_t;
#else
typedef u32 jump_label_t;
#endif

struct jump_entry {
	jump_label_t code;
	jump_label_t target;
	jump_label_t key;
};

#endif
Commit	Line	Data
d9f5ab7b JB	1	#ifndef _ASM_X86_JUMP_LABEL_H
	2	#define _ASM_X86_JUMP_LABEL_H
	3
	4	#ifdef __KERNEL__
	5
	6	#include <linux/types.h>
	7	#include <asm/nops.h>
	8
	9	#define JUMP_LABEL_NOP_SIZE 5
	10
	11	# define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
	12
	13	# define JUMP_LABEL(key, label) \
	14	do { \
	15	asm goto("1:" \
	16	JUMP_LABEL_INITIAL_NOP \
89696913	17	".pushsection __jump_table, \"aw\" \n\t"\
d9f5ab7b JB	18	_ASM_PTR "1b, %l[" #label "], %c0 \n\t" \
	19	".popsection \n\t" \
	20	: : "i" (key) : : label); \
	21	} while (0)
	22
	23	#endif /* __KERNEL__ */
	24
	25	#ifdef CONFIG_X86_64
d9f5ab7b	26	typedef u64 jump_label_t;
d9f5ab7b	27	#else
d9f5ab7b	28	typedef u32 jump_label_t;
95fccd46	29	#endif
d9f5ab7b JB	30
	31	struct jump_entry {
	32	jump_label_t code;
	33	jump_label_t target;
	34	jump_label_t key;
	35	};
	36
	37	#endif