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 12 void arch_jump_label_transform(struct jump_entry *entry, 13 enum jump_label_type type) 14 { 15 void *addr = (void *)jump_entry_code(entry); 16 u32 insn; 17 18 if (type == JUMP_LABEL_JMP) { 19 insn = aarch64_insn_gen_branch_imm(jump_entry_code(entry), 20 jump_entry_target(entry), 21 AARCH64_INSN_BRANCH_NOLINK); 22 } else { 23 insn = aarch64_insn_gen_nop(); 24 } 25 26 aarch64_insn_patch_text_nosync(addr, insn); 27 } 28 29 void arch_jump_label_transform_static(struct jump_entry *entry, 30 enum jump_label_type type) 31 { 32 /* 33 * We use the architected A64 NOP in arch_static_branch, so there's no 34 * need to patch an identical A64 NOP over the top of it here. The core 35 * will call arch_jump_label_transform from a module notifier if the 36 * NOP needs to be replaced by a branch. 37 */ 38 } 39