Cregit: Linux 5.9: jump

Contributors: 6
Author	Tokens	Token Proportion	Commits	Commit Proportion
Jiang Liu	39	29.77%	1	16.67%
Miguel Ojeda Sandonis	39	29.77%	1	16.67%
Peter Zijlstra	33	25.19%	1	16.67%
Ard Biesheuvel	12	9.16%	1	16.67%
Anton Blanchard	6	4.58%	1	16.67%
Thomas Gleixner	2	1.53%	1	16.67%
Total	131		6

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2013 Huawei Ltd.
 * Author: Jiang Liu <liuj97@gmail.com>
 *
 * Based on arch/arm/include/asm/jump_label.h
 */
#ifndef __ASM_JUMP_LABEL_H
#define __ASM_JUMP_LABEL_H

#ifndef __ASSEMBLY__

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

#define JUMP_LABEL_NOP_SIZE		AARCH64_INSN_SIZE

static __always_inline bool arch_static_branch(struct static_key *key,
					       bool branch)
{
	asm_volatile_goto(
		"1:	nop					\n\t"
		 "	.pushsection	__jump_table, \"aw\"	\n\t"
		 "	.align		3			\n\t"
		 "	.long		1b - ., %l[l_yes] - .	\n\t"
		 "	.quad		%c0 - .			\n\t"
		 "	.popsection				\n\t"
		 :  :  "i"(&((char *)key)[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:	b		%l[l_yes]		\n\t"
		 "	.pushsection	__jump_table, \"aw\"	\n\t"
		 "	.align		3			\n\t"
		 "	.long		1b - ., %l[l_yes] - .	\n\t"
		 "	.quad		%c0 - .			\n\t"
		 "	.popsection				\n\t"
		 :  :  "i"(&((char *)key)[branch]) :  : l_yes);

	return false;
l_yes:
	return true;
}

#endif  /* __ASSEMBLY__ */
#endif	/* __ASM_JUMP_LABEL_H */