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 #define JUMP_TABLE_ENTRY \ 17 ".pushsection __jump_table, \"aw\" \n\t" \ 18 ".align 3 \n\t" \ 19 ".long 1b - ., %l[l_yes] - . \n\t" \ 20 ".quad %0 - . \n\t" \ 21 ".popsection \n\t" 22 23 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch) 24 { 25 asm_volatile_goto( 26 "1: nop \n\t" 27 JUMP_TABLE_ENTRY 28 : : "i"(&((char *)key)[branch]) : : l_yes); 29 30 return false; 31 32 l_yes: 33 return true; 34 } 35 36 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch) 37 { 38 asm_volatile_goto( 39 "1: b %l[l_yes] \n\t" 40 JUMP_TABLE_ENTRY 41 : : "i"(&((char *)key)[branch]) : : l_yes); 42 43 return false; 44 45 l_yes: 46 return true; 47 } 48 49 #endif /* __ASSEMBLY__ */ 50 #endif /* __ASM_JUMP_LABEL_H */ 51