projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |