[linux-2.6-block.git] / arch / x86 / include / asm / jump_label.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_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

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

#ifndef __ASSEMBLY__

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

static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm_volatile_goto("STATIC_BRANCH_NOP l_yes=\"%l[l_yes]\" key=\"%c0\" "
			  "branch=\"%c1\""
			: :  "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("STATIC_BRANCH_JMP l_yes=\"%l[l_yes]\" key=\"%c0\" "
			  "branch=\"%c1\""
		: :  "i" (key), "i" (branch) : : l_yes);

	return false;
l_yes:
	return true;
}

#else	/* __ASSEMBLY__ */

.macro STATIC_BRANCH_NOP l_yes:req key:req branch:req
.Lstatic_branch_nop_\@:
	.byte STATIC_KEY_INIT_NOP
.Lstatic_branch_no_after_\@:
	.pushsection __jump_table, "aw"
	_ASM_ALIGN
	.long		.Lstatic_branch_nop_\@ - ., \l_yes - .
	_ASM_PTR        \key + \branch - .
	.popsection
.endm

.macro STATIC_BRANCH_JMP l_yes:req key:req branch:req
.Lstatic_branch_jmp_\@:
	.byte 0xe9
	.long \l_yes - .Lstatic_branch_jmp_after_\@
.Lstatic_branch_jmp_after_\@:
	.pushsection __jump_table, "aw"
	_ASM_ALIGN
	.long		.Lstatic_branch_jmp_\@ - ., \l_yes - .
	_ASM_PTR	\key + \branch - .
	.popsection
.endm

#endif	/* __ASSEMBLY__ */

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
d9f5ab7b JB	2	#ifndef _ASM_X86_JUMP_LABEL_H
	3	#define _ASM_X86_JUMP_LABEL_H
	4
d9f5ab7b JB	5	#define JUMP_LABEL_NOP_SIZE 5
d9f5ab7b JB	6
c3c7f14a SR	7	#ifdef CONFIG_X86_64
	8	# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC
	9	#else
	10	# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
	11	#endif
d430d3d7	12
2671c3e4 AL	13	#include <asm/asm.h>
	14	#include <asm/nops.h>
	15
	16	#ifndef __ASSEMBLY__
	17
	18	#include <linux/stringify.h>
	19	#include <linux/types.h>
	20
11276d53	21	static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
d430d3d7	22	{
5bdcd510 NA	23	asm_volatile_goto("STATIC_BRANCH_NOP l_yes=\"%l[l_yes]\" key=\"%c0\" "
	24	"branch=\"%c1\""
	25	: : "i" (key), "i" (branch) : : l_yes);
11276d53 PZ	26	return false;
	27	l_yes:
	28	return true;
	29	}
	30
	31	static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
	32	{
5bdcd510 NA	33	asm_volatile_goto("STATIC_BRANCH_JMP l_yes=\"%l[l_yes]\" key=\"%c0\" "
5bdcd510 NA	34	"branch=\"%c1\""
d420acd8	35	: : "i" (key), "i" (branch) : : l_yes);
11276d53	36
d430d3d7 JB	37	return false;
	38	l_yes:
	39	return true;
	40	}
d9f5ab7b	41
2671c3e4 AL	42	#else /* __ASSEMBLY__ */
2671c3e4 AL	43
5bdcd510 NA	44	.macro STATIC_BRANCH_NOP l_yes:req key:req branch:req
	45	.Lstatic_branch_nop_\@:
	46	.byte STATIC_KEY_INIT_NOP
	47	.Lstatic_branch_no_after_\@:
2671c3e4 AL	48	.pushsection __jump_table, "aw"
2671c3e4 AL	49	_ASM_ALIGN
5bdcd510 NA	50	.long .Lstatic_branch_nop_\@ - ., \l_yes - .
5bdcd510 NA	51	_ASM_PTR \key + \branch - .
2671c3e4 AL	52	.popsection
	53	.endm
	54
5bdcd510 NA	55	.macro STATIC_BRANCH_JMP l_yes:req key:req branch:req
	56	.Lstatic_branch_jmp_\@:
	57	.byte 0xe9
	58	.long \l_yes - .Lstatic_branch_jmp_after_\@
	59	.Lstatic_branch_jmp_after_\@:
2671c3e4 AL	60	.pushsection __jump_table, "aw"
2671c3e4 AL	61	_ASM_ALIGN
5bdcd510 NA	62	.long .Lstatic_branch_jmp_\@ - ., \l_yes - .
5bdcd510 NA	63	_ASM_PTR \key + \branch - .
2671c3e4 AL	64	.popsection
	65	.endm
	66
	67	#endif /* __ASSEMBLY__ */
	68
d9f5ab7b	69	#endif