arch/arm64/kernel/jump_label.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Huawei Ltd.
   4  * Author: Jiang Liu <[email protected]>
   5  *
   6  * Based on arch/arm/kernel/jump_label.c
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/jump_label.h>
  10 #include <linux/smp.h>
  11 #include <asm/insn.h>
  12 #include <asm/patching.h>
  13
  14 bool arch_jump_label_transform_queue(struct jump_entry *entry,
  15                                      enum jump_label_type type)
  16 {
  17         void *addr = (void *)jump_entry_code(entry);
  18         u32 insn;
  19
  20         if (type == JUMP_LABEL_JMP) {
  21                 insn = aarch64_insn_gen_branch_imm(jump_entry_code(entry),
  22                                                    jump_entry_target(entry),
  23                                                    AARCH64_INSN_BRANCH_NOLINK);
  24         } else {
  25                 insn = aarch64_insn_gen_nop();
  26         }
  27
  28         aarch64_insn_patch_text_nosync(addr, insn);
  29         return true;
  30 }
  31
  32 void arch_jump_label_transform_apply(void)
  33 {
  34         kick_all_cpus_sync();
  35 }