arch/arm64/include/asm/jump_label.h

/*
 * Copyright (C) 2013 Huawei Ltd.
 * Author: Jiang Liu <liuj97@gmail.com>
 *
 * Based on arch/arm/include/asm/jump_label.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#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 */