tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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/include/asm/jump_label.h
7 */
8#ifndef __ASM_JUMP_LABEL_H
9#define __ASM_JUMP_LABEL_H
10
11#ifndef __ASSEMBLY__
12
13#include <linux/types.h>
14#include <asm/insn.h>
15
16#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
17
18static __always_inline bool arch_static_branch(struct static_key *key,
19 bool branch)
20{
21 asm_volatile_goto(
22 "1: nop \n\t"
23 " .pushsection __jump_table, \"aw\" \n\t"
24 " .align 3 \n\t"
25 " .long 1b - ., %l[l_yes] - . \n\t"
26 " .quad %c0 - . \n\t"
27 " .popsection \n\t"
28 : : "i"(&((char *)key)[branch]) : : l_yes);
29
30 return false;
31l_yes:
32 return true;
33}
34
35static __always_inline bool arch_static_branch_jump(struct static_key *key,
36 bool branch)
37{
38 asm_volatile_goto(
39 "1: b %l[l_yes] \n\t"
40 " .pushsection __jump_table, \"aw\" \n\t"
41 " .align 3 \n\t"
42 " .long 1b - ., %l[l_yes] - . \n\t"
43 " .quad %c0 - . \n\t"
44 " .popsection \n\t"
45 : : "i"(&((char *)key)[branch]) : : l_yes);
46
47 return false;
48l_yes:
49 return true;
50}
51
52#endif /* __ASSEMBLY__ */
53#endif /* __ASM_JUMP_LABEL_H */