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 HAVE_JUMP_LABEL_BATCH
17 #define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
18
19 #define JUMP_TABLE_ENTRY(key, label) \
20 ".pushsection __jump_table, \"aw\"\n\t" \
21 ".align 3\n\t" \
22 ".long 1b - ., %l["#label"] - .\n\t" \
23 ".quad %c0 - .\n\t" \
24 ".popsection\n\t" \
25 : : "i"(key) : : label
26
27 static __always_inline bool arch_static_branch(struct static_key * const key,
28 const bool branch)
29 {
30 char *k = &((char *)key)[branch];
31
32 asm goto(
33 "1: nop \n\t"
34 JUMP_TABLE_ENTRY(k, l_yes)
35 );
36
37 return false;
38 l_yes:
39 return true;
40 }
41
42 static __always_inline bool arch_static_branch_jump(struct static_key * const key,
43 const bool branch)
44 {
45 char *k = &((char *)key)[branch];
46 asm goto(
47 "1: b %l[l_yes] \n\t"
48 JUMP_TABLE_ENTRY(k, l_yes)
49 );
50 return false;
51 l_yes:
52 return true;
53 }
54
55 #endif /* __ASSEMBLY__ */
56 #endif /* __ASM_JUMP_LABEL_H */
57
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