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| 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 __ASSEMBLER__ |
| 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 - ., " label " - .\n\t" \ |
| 23 | ".quad " key " - .\n\t" \ |
| 24 | ".popsection\n\t" |
| 25 | |
| 26 | /* This macro is also expanded on the Rust side. */ |
| 27 | #define ARCH_STATIC_BRANCH_ASM(key, label) \ |
| 28 | "1: nop\n\t" \ |
| 29 | JUMP_TABLE_ENTRY(key, label) |
| 30 | |
| 31 | static __always_inline bool arch_static_branch(struct static_key * const key, |
| 32 | const bool branch) |
| 33 | { |
| 34 | char *k = &((char *)key)[branch]; |
| 35 | |
| 36 | asm goto( |
| 37 | ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") |
| 38 | : : "i"(k) : : l_yes |
| 39 | ); |
| 40 | |
| 41 | return false; |
| 42 | l_yes: |
| 43 | return true; |
| 44 | } |
| 45 | |
| 46 | static __always_inline bool arch_static_branch_jump(struct static_key * const key, |
| 47 | const bool branch) |
| 48 | { |
| 49 | char *k = &((char *)key)[branch]; |
| 50 | |
| 51 | asm goto( |
| 52 | "1: b %l[l_yes] \n\t" |
| 53 | JUMP_TABLE_ENTRY("%c0", "%l[l_yes]") |
| 54 | : : "i"(k) : : l_yes |
| 55 | ); |
| 56 | return false; |
| 57 | l_yes: |
| 58 | return true; |
| 59 | } |
| 60 | |
| 61 | #endif /* __ASSEMBLER__ */ |
| 62 | #endif /* __ASM_JUMP_LABEL_H */ |
| 63 |
Warning: This file is not a C or C++ file. It does not have highlighting.