2 * Copyright (C) 2013 Huawei Ltd.
3 * Author: Jiang Liu <liuj97@gmail.com>
5 * Based on arch/arm/kernel/jump_label.c
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.
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.
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/>.
19 #include <linux/kernel.h>
20 #include <linux/jump_label.h>
23 void arch_jump_label_transform(struct jump_entry *entry,
24 enum jump_label_type type)
26 void *addr = (void *)entry->code;
29 if (type == JUMP_LABEL_JMP) {
30 insn = aarch64_insn_gen_branch_imm(entry->code,
32 AARCH64_INSN_BRANCH_NOLINK);
34 insn = aarch64_insn_gen_nop();
37 aarch64_insn_patch_text_nosync(addr, insn);
40 void arch_jump_label_transform_static(struct jump_entry *entry,
41 enum jump_label_type type)
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.