1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 Huawei Ltd. 4 * Author: Jiang Liu <liuj97@gmail.com> 5 * 6 * Based on arch/arm/kernel/jump_label.c 7 */ 8 #include <linux/kernel.h> 9 #include <linux/jump_label.h> 10 #include <asm/insn.h> 11 #include <asm/patching.h> 12 13 void arch_jump_label_transform(struct jump_entry *entry, 14 enum jump_label_type type) 15 { 16 void *addr = (void *)jump_entry_code(entry); 17 u32 insn; 18 19 if (type == JUMP_LABEL_JMP) { 20 insn = aarch64_insn_gen_branch_imm(jump_entry_code(entry), 21 jump_entry_target(entry), 22 AARCH64_INSN_BRANCH_NOLINK); 23 } else { 24 insn = aarch64_insn_gen_nop(); 25 } 26 27 aarch64_insn_patch_text_nosync(addr, insn); 28 } 29 30 void arch_jump_label_transform_static(struct jump_entry *entry, 31 enum jump_label_type type) 32 { 33 /* 34 * We use the architected A64 NOP in arch_static_branch, so there's no 35 * need to patch an identical A64 NOP over the top of it here. The core 36 * will call arch_jump_label_transform from a module notifier if the 37 * NOP needs to be replaced by a branch. 38 */ 39 } 40