1f02644e3SYouling Tang /* SPDX-License-Identifier: GPL-2.0-only */ 2f02644e3SYouling Tang /* 3f02644e3SYouling Tang * Copyright (C) 2023 Loongson Technology Corporation Limited 4f02644e3SYouling Tang * 5f02644e3SYouling Tang * Based on arch/arm64/include/asm/jump_label.h 6f02644e3SYouling Tang */ 7f02644e3SYouling Tang #ifndef __ASM_JUMP_LABEL_H 8f02644e3SYouling Tang #define __ASM_JUMP_LABEL_H 9f02644e3SYouling Tang 10f02644e3SYouling Tang #ifndef __ASSEMBLY__ 11f02644e3SYouling Tang 12f02644e3SYouling Tang #include <linux/types.h> 13f02644e3SYouling Tang 14f02644e3SYouling Tang #define JUMP_LABEL_NOP_SIZE 4 15f02644e3SYouling Tang 16f02644e3SYouling Tang #define JUMP_TABLE_ENTRY \ 17f02644e3SYouling Tang ".pushsection __jump_table, \"aw\" \n\t" \ 18f02644e3SYouling Tang ".align 3 \n\t" \ 19f02644e3SYouling Tang ".long 1b - ., %l[l_yes] - . \n\t" \ 20f02644e3SYouling Tang ".quad %0 - . \n\t" \ 21f02644e3SYouling Tang ".popsection \n\t" 22f02644e3SYouling Tang arch_static_branch(struct static_key * const key,const bool branch)23f02644e3SYouling Tangstatic __always_inline bool arch_static_branch(struct static_key * const key, const bool branch) 24f02644e3SYouling Tang { 25*4356e9f8SLinus Torvalds asm goto( 26f02644e3SYouling Tang "1: nop \n\t" 27f02644e3SYouling Tang JUMP_TABLE_ENTRY 28f02644e3SYouling Tang : : "i"(&((char *)key)[branch]) : : l_yes); 29f02644e3SYouling Tang 30f02644e3SYouling Tang return false; 31f02644e3SYouling Tang 32f02644e3SYouling Tang l_yes: 33f02644e3SYouling Tang return true; 34f02644e3SYouling Tang } 35f02644e3SYouling Tang arch_static_branch_jump(struct static_key * const key,const bool branch)36f02644e3SYouling Tangstatic __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch) 37f02644e3SYouling Tang { 38*4356e9f8SLinus Torvalds asm goto( 39f02644e3SYouling Tang "1: b %l[l_yes] \n\t" 40f02644e3SYouling Tang JUMP_TABLE_ENTRY 41f02644e3SYouling Tang : : "i"(&((char *)key)[branch]) : : l_yes); 42f02644e3SYouling Tang 43f02644e3SYouling Tang return false; 44f02644e3SYouling Tang 45f02644e3SYouling Tang l_yes: 46f02644e3SYouling Tang return true; 47f02644e3SYouling Tang } 48f02644e3SYouling Tang 49f02644e3SYouling Tang #endif /* __ASSEMBLY__ */ 50f02644e3SYouling Tang #endif /* __ASM_JUMP_LABEL_H */ 51