[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>
#include <asm/asm.h>

#define JUMP_LABEL_NOP_SIZE 5

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

static __always_inline bool arch_static_branch(struct jump_label_key *key)
{
	asm goto("1:"
		JUMP_LABEL_INITIAL_NOP
		".pushsection __jump_table,  \"aw\" \n\t"
		_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
		".popsection \n\t"
		: :  "i" (key) : : l_yes);
	return false;
l_yes:
	return true;
}

#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>
d430d3d7	8	#include <asm/asm.h>
d9f5ab7b JB	9
	10	#define JUMP_LABEL_NOP_SIZE 5
	11
d430d3d7 JB	12	#define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
	13
	14	static __always_inline bool arch_static_branch(struct jump_label_key *key)
	15	{
	16	asm goto("1:"
	17	JUMP_LABEL_INITIAL_NOP
	18	".pushsection __jump_table, \"aw\" \n\t"
	19	_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
	20	".popsection \n\t"
	21	: : "i" (key) : : l_yes);
	22	return false;
	23	l_yes:
	24	return true;
	25	}
d9f5ab7b JB	26
	27	#endif /* __KERNEL__ */
	28
	29	#ifdef CONFIG_X86_64
d9f5ab7b	30	typedef u64 jump_label_t;
d9f5ab7b	31	#else
d9f5ab7b	32	typedef u32 jump_label_t;
95fccd46	33	#endif
d9f5ab7b JB	34
	35	struct jump_entry {
	36	jump_label_t code;
	37	jump_label_t target;
	38	jump_label_t key;
	39	};
	40
	41	#endif