blob: a0a5bbae7229e8a791748ebaa193c1ccd118ff1c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2013 Huawei Ltd.
* Author: Jiang Liu <liuj97@gmail.com>
*
* Based on arch/arm/include/asm/jump_label.h
*/
#ifndef __ASM_JUMP_LABEL_H
#define __ASM_JUMP_LABEL_H
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <asm/insn.h>
#define HAVE_JUMP_LABEL_BATCH
#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
#define JUMP_TABLE_ENTRY(key, label) \
".pushsection __jump_table, \"aw\"\n\t" \
".align 3\n\t" \
".long 1b - ., %l["#label"] - .\n\t" \
".quad %c0 - .\n\t" \
".popsection\n\t" \
: : "i"(key) : : label
static __always_inline bool arch_static_branch(struct static_key * const key,
const bool branch)
{
char *k = &((char *)key)[branch];
asm goto(
"1: nop \n\t"
JUMP_TABLE_ENTRY(k, l_yes)
);
return false;
l_yes:
return true;
}
static __always_inline bool arch_static_branch_jump(struct static_key * const key,
const bool branch)
{
char *k = &((char *)key)[branch];
asm goto(
"1: b %l[l_yes] \n\t"
JUMP_TABLE_ENTRY(k, l_yes)
);
return false;
l_yes:
return true;
}
#endif /* __ASSEMBLY__ */
#endif /* __ASM_JUMP_LABEL_H */
|
