cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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jump_label.c (1056B)

      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
     13void 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
     30void 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}