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9732cafd JL |
1 | /* |
2 | * Copyright (C) 2013 Huawei Ltd. | |
3 | * Author: Jiang Liu <liuj97@gmail.com> | |
4 | * | |
5 | * Based on arch/arm/include/asm/jump_label.h | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | #ifndef __ASM_JUMP_LABEL_H | |
20 | #define __ASM_JUMP_LABEL_H | |
55dd0df7 AB |
21 | |
22 | #ifndef __ASSEMBLY__ | |
23 | ||
9732cafd JL |
24 | #include <linux/types.h> |
25 | #include <asm/insn.h> | |
26 | ||
9732cafd JL |
27 | #define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE |
28 | ||
11276d53 | 29 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
9732cafd JL |
30 | { |
31 | asm goto("1: nop\n\t" | |
32 | ".pushsection __jump_table, \"aw\"\n\t" | |
33 | ".align 3\n\t" | |
34 | ".quad 1b, %l[l_yes], %c0\n\t" | |
35 | ".popsection\n\t" | |
11276d53 PZ |
36 | : : "i"(&((char *)key)[branch]) : : l_yes); |
37 | ||
38 | return false; | |
39 | l_yes: | |
40 | return true; | |
41 | } | |
42 | ||
43 | static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) | |
44 | { | |
45 | asm goto("1: b %l[l_yes]\n\t" | |
46 | ".pushsection __jump_table, \"aw\"\n\t" | |
47 | ".align 3\n\t" | |
48 | ".quad 1b, %l[l_yes], %c0\n\t" | |
49 | ".popsection\n\t" | |
50 | : : "i"(&((char *)key)[branch]) : : l_yes); | |
9732cafd JL |
51 | |
52 | return false; | |
53 | l_yes: | |
54 | return true; | |
55 | } | |
56 | ||
9732cafd JL |
57 | typedef u64 jump_label_t; |
58 | ||
59 | struct jump_entry { | |
60 | jump_label_t code; | |
61 | jump_label_t target; | |
62 | jump_label_t key; | |
63 | }; | |
64 | ||
55dd0df7 | 65 | #endif /* __ASSEMBLY__ */ |
9732cafd | 66 | #endif /* __ASM_JUMP_LABEL_H */ |