1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2023 Loongson Technology Corporation Limited
4 *
5 * Based on arch/arm64/include/asm/jump_label.h
6 */
7 #ifndef __ASM_JUMP_LABEL_H
8 #define __ASM_JUMP_LABEL_H
9
10 #ifndef __ASSEMBLY__
11
12 #include <linux/types.h>
13
14 #define JUMP_LABEL_NOP_SIZE 4
15
16 #define JUMP_TABLE_ENTRY \
17 ".pushsection __jump_table, \"aw\" \n\t" \
18 ".align 3 \n\t" \
19 ".long 1b - ., %l[l_yes] - . \n\t" \
20 ".quad %0 - . \n\t" \
21 ".popsection \n\t"
22
23 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
24 {
25 asm goto(
26 "1: nop \n\t"
27 JUMP_TABLE_ENTRY
28 : : "i"(&((char *)key)[branch]) : : l_yes);
29
30 return false;
31
32 l_yes:
33 return true;
34 }
35
36 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
37 {
38 asm goto(
39 "1: b %l[l_yes] \n\t"
40 JUMP_TABLE_ENTRY
41 : : "i"(&((char *)key)[branch]) : : l_yes);
42
43 return false;
44
45 l_yes:
46 return true;
47 }
48
49 #endif /* __ASSEMBLY__ */
50 #endif /* __ASM_JUMP_LABEL_H */
51
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