1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2023 Loongson Technology Corporation Limited 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 14 #define JUMP_LABEL_NOP_SIZE 4 15 16 /* This macro is also expanded on the Rust side. */ 17 #define JUMP_TABLE_ENTRY(key, label) \ 18 ".pushsection __jump_table, \"aw\" \n\t" \ 19 ".align 3 \n\t" \ 20 ".long 1b - ., " label " - . \n\t" \ 21 ".quad " key " - . \n\t" \ 22 ".popsection \n\t" 23 24 #define ARCH_STATIC_BRANCH_ASM(key, label) \ 25 "1: nop \n\t" \ 26 JUMP_TABLE_ENTRY(key, label) 27 28 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch) 29 { 30 asm goto( 31 ARCH_STATIC_BRANCH_ASM("%0", "%l[l_yes]") 32 : : "i"(&((char *)key)[branch]) : : l_yes); 33 34 return false; 35 36 l_yes: 37 return true; 38 } 39 40 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch) 41 { 42 asm goto( 43 "1: b %l[l_yes] \n\t" 44 JUMP_TABLE_ENTRY("%0", "%l[l_yes]") 45 : : "i"(&((char *)key)[branch]) : : l_yes); 46 47 return false; 48 49 l_yes: 50 return true; 51 } 52 53 #endif /* __ASSEMBLY__ */ 54 #endif /* __ASM_JUMP_LABEL_H */ 55