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
23#ifdef HAVE_JUMP_LABEL
24
25void arch_jump_label_transform(struct jump_entry *entry,
26			       enum jump_label_type type)
27{
28	void *addr = (void *)entry->code;
29	u32 insn;
30
31	if (type == JUMP_LABEL_ENABLE) {
32		insn = aarch64_insn_gen_branch_imm(entry->code,
33						   entry->target,
34						   AARCH64_INSN_BRANCH_NOLINK);
35	} else {
36		insn = aarch64_insn_gen_nop();
37	}
38
39	aarch64_insn_patch_text(&addr, &insn, 1);
40}
41
42void arch_jump_label_transform_static(struct jump_entry *entry,
43				      enum jump_label_type type)
44{
45	/*
46	 * We use the architected A64 NOP in arch_static_branch, so there's no
47	 * need to patch an identical A64 NOP over the top of it here. The core
48	 * will call arch_jump_label_transform from a module notifier if the
49	 * NOP needs to be replaced by a branch.
50	 */
51}
52
53#endif	/* HAVE_JUMP_LABEL */
54