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

#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H

#ifndef __ASSEMBLY__

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

#define JUMP_LABEL_NOP_SIZE 5

#ifdef CONFIG_X86_64
# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC
#else
# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
#endif

static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:"
		".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
		".pushsection __jump_table,  \"aw\" \n\t"
		_ASM_ALIGN "\n\t"
		_ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t"
		".popsection \n\t"
		: :  "i" (key), "i" (branch) : : l_yes);

	return false;
l_yes:
	return true;
}

static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:"
		".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t"
		"2:\n\t"
		".pushsection __jump_table,  \"aw\" \n\t"
		_ASM_ALIGN "\n\t"
		_ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t"
		".popsection \n\t"
		: :  "i" (key), "i" (branch) : : l_yes);

	return false;
l_yes:
	return true;
}

#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  /* __ASSEMBLY__ */
#endif
Commit	Line	Data
d9f5ab7b JB	1	#ifndef _ASM_X86_JUMP_LABEL_H
	2	#define _ASM_X86_JUMP_LABEL_H
	3
55dd0df7	4	#ifndef __ASSEMBLY__
d9f5ab7b	5
c3c7f14a	6	#include <linux/stringify.h>
d9f5ab7b JB	7	#include <linux/types.h>
d9f5ab7b JB	8	#include <asm/nops.h>
d430d3d7	9	#include <asm/asm.h>
d9f5ab7b JB	10
	11	#define JUMP_LABEL_NOP_SIZE 5
	12
c3c7f14a SR	13	#ifdef CONFIG_X86_64
	14	# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC
	15	#else
	16	# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
	17	#endif
d430d3d7	18
11276d53	19	static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
d430d3d7	20	{
3f0116c3	21	asm_volatile_goto("1:"
c3c7f14a	22	".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
d430d3d7	23	".pushsection __jump_table, \"aw\" \n\t"
ef647894	24	_ASM_ALIGN "\n\t"
d420acd8	25	_ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t"
d430d3d7	26	".popsection \n\t"
d420acd8	27	: : "i" (key), "i" (branch) : : l_yes);
11276d53 PZ	28
	29	return false;
	30	l_yes:
	31	return true;
	32	}
	33
	34	static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
	35	{
	36	asm_volatile_goto("1:"
	37	".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t"
	38	"2:\n\t"
	39	".pushsection __jump_table, \"aw\" \n\t"
	40	_ASM_ALIGN "\n\t"
d420acd8	41	_ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t"
11276d53	42	".popsection \n\t"
d420acd8	43	: : "i" (key), "i" (branch) : : l_yes);
11276d53	44
d430d3d7 JB	45	return false;
	46	l_yes:
	47	return true;
	48	}
d9f5ab7b	49
d9f5ab7b	50	#ifdef CONFIG_X86_64
d9f5ab7b	51	typedef u64 jump_label_t;
d9f5ab7b	52	#else
d9f5ab7b	53	typedef u32 jump_label_t;
95fccd46	54	#endif
d9f5ab7b JB	55
	56	struct jump_entry {
	57	jump_label_t code;
	58	jump_label_t target;
	59	jump_label_t key;
	60	};
	61
55dd0df7	62	#endif /* __ASSEMBLY__ */
d9f5ab7b	63	#endif