blob: b360c4c2b5e792ef276443ca550b535e7050cb35 (
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
57
|
/* 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 JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
/*
* Prefer the constraint "S" to support PIC with GCC. Clang before 19 does not
* support "S" on a symbol with a constant offset, so we use "i" as a fallback.
*/
static __always_inline bool arch_static_branch(struct static_key * const key,
const bool branch)
{
asm goto(
"1: nop \n\t"
" .pushsection __jump_table, \"aw\" \n\t"
" .align 3 \n\t"
" .long 1b - ., %l[l_yes] - . \n\t"
" .quad (%[key] - .) + %[bit0] \n\t"
" .popsection \n\t"
: : [key]"Si"(key), [bit0]"i"(branch) : : l_yes);
return false;
l_yes:
return true;
}
static __always_inline bool arch_static_branch_jump(struct static_key * const key,
const bool branch)
{
asm goto(
"1: b %l[l_yes] \n\t"
" .pushsection __jump_table, \"aw\" \n\t"
" .align 3 \n\t"
" .long 1b - ., %l[l_yes] - . \n\t"
" .quad (%[key] - .) + %[bit0] \n\t"
" .popsection \n\t"
: : [key]"Si"(key), [bit0]"i"(branch) : : l_yes);
return false;
l_yes:
return true;
}
#endif /* __ASSEMBLY__ */
#endif /* __ASM_JUMP_LABEL_H */
|
