[linux-2.6-block.git] / arch / arm64 / kernel / jump_label.c

/*
 * Copyright (C) 2013 Huawei Ltd.
 * Author: Jiang Liu <liuj97@gmail.com>
 *
 * Based on arch/arm/kernel/jump_label.c
 *
 * 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/>.
 */
#include <linux/kernel.h>
#include <linux/jump_label.h>
#include <asm/insn.h>

void arch_jump_label_transform(struct jump_entry *entry,
			       enum jump_label_type type)
{
	void *addr = (void *)jump_entry_code(entry);
	u32 insn;

	if (type == JUMP_LABEL_JMP) {
		insn = aarch64_insn_gen_branch_imm(jump_entry_code(entry),
						   jump_entry_target(entry),
						   AARCH64_INSN_BRANCH_NOLINK);
	} else {
		insn = aarch64_insn_gen_nop();
	}

	aarch64_insn_patch_text_nosync(addr, insn);
}

void arch_jump_label_transform_static(struct jump_entry *entry,
				      enum jump_label_type type)
{
	/*
	 * We use the architected A64 NOP in arch_static_branch, so there's no
	 * need to patch an identical A64 NOP over the top of it here. The core
	 * will call arch_jump_label_transform from a module notifier if the
	 * NOP needs to be replaced by a branch.
	 */
}
Commit	Line	Data
9732cafd JL	1	/*
	2	* Copyright (C) 2013 Huawei Ltd.
	3	* Author: Jiang Liu <liuj97@gmail.com>
	4	*
	5	* Based on arch/arm/kernel/jump_label.c
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19	#include <linux/kernel.h>
	20	#include <linux/jump_label.h>
	21	#include <asm/insn.h>
	22
6ddae418 MR	23	void arch_jump_label_transform(struct jump_entry *entry,
6ddae418 MR	24	enum jump_label_type type)
9732cafd	25	{
c296146c	26	void addr = (void )jump_entry_code(entry);
9732cafd JL	27	u32 insn;
9732cafd JL	28
76b235c6	29	if (type == JUMP_LABEL_JMP) {
c296146c AB	30	insn = aarch64_insn_gen_branch_imm(jump_entry_code(entry),
c296146c AB	31	jump_entry_target(entry),
9732cafd JL	32	AARCH64_INSN_BRANCH_NOLINK);
	33	} else {
	34	insn = aarch64_insn_gen_nop();
	35	}
	36
f6cc0c50	37	aarch64_insn_patch_text_nosync(addr, insn);
9732cafd JL	38	}
	39
	40	void arch_jump_label_transform_static(struct jump_entry *entry,
	41	enum jump_label_type type)
	42	{
6ddae418 MR	43	/*
	44	* We use the architected A64 NOP in arch_static_branch, so there's no
	45	* need to patch an identical A64 NOP over the top of it here. The core
	46	* will call arch_jump_label_transform from a module notifier if the
	47	* NOP needs to be replaced by a branch.
	48	*/
9732cafd	49	}