projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ebc00dde ERB |
1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* | |
| 3 | * Copyright (C) 2020 Emil Renner Berthing | |
| 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 | #include <asm/asm.h> | |
| 14 | ||
| 15 | #define JUMP_LABEL_NOP_SIZE 4 | |
| 16 | ||
| 89fd4a1d JZ |
17 | static __always_inline bool arch_static_branch(struct static_key * const key, |
| 18 | const bool branch) | |
| ebc00dde | 19 | { |
| 4356e9f8 | 20 | asm goto( |
| 9ddfc3cd | 21 | " .align 2 \n\t" |
| ebc00dde ERB |
22 | " .option push \n\t" |
| 23 | " .option norelax \n\t" | |
| 24 | " .option norvc \n\t" | |
| 25 | "1: nop \n\t" | |
| 26 | " .option pop \n\t" | |
| 27 | " .pushsection __jump_table, \"aw\" \n\t" | |
| 28 | " .align " RISCV_LGPTR " \n\t" | |
| 29 | " .long 1b - ., %l[label] - . \n\t" | |
| 30 | " " RISCV_PTR " %0 - . \n\t" | |
| 31 | " .popsection \n\t" | |
| 32 | : : "i"(&((char *)key)[branch]) : : label); | |
| 33 | ||
| 34 | return false; | |
| 35 | label: | |
| 36 | return true; | |
| 37 | } | |
| 38 | ||
| 89fd4a1d JZ |
39 | static __always_inline bool arch_static_branch_jump(struct static_key * const key, |
| 40 | const bool branch) | |
| ebc00dde | 41 | { |
| 4356e9f8 | 42 | asm goto( |
| 9ddfc3cd | 43 | " .align 2 \n\t" |
| ebc00dde ERB |
44 | " .option push \n\t" |
| 45 | " .option norelax \n\t" | |
| 46 | " .option norvc \n\t" | |
| 47 | "1: jal zero, %l[label] \n\t" | |
| 48 | " .option pop \n\t" | |
| 49 | " .pushsection __jump_table, \"aw\" \n\t" | |
| 50 | " .align " RISCV_LGPTR " \n\t" | |
| 51 | " .long 1b - ., %l[label] - . \n\t" | |
| 52 | " " RISCV_PTR " %0 - . \n\t" | |
| 53 | " .popsection \n\t" | |
| 54 | : : "i"(&((char *)key)[branch]) : : label); | |
| 55 | ||
| 56 | return false; | |
| 57 | label: | |
| 58 | return true; | |
| 59 | } | |
| 60 | ||
| 61 | #endif /* __ASSEMBLY__ */ | |
| 62 | #endif /* __ASM_JUMP_LABEL_H */ |