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 __ASSEMBLY__ 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 - ., %l["#label"] - .\n\t" \ 23 ".quad %c0 - .\n\t" \ 24 ".popsection\n\t" \ 25 : : "i"(key) : : label 26 27 static __always_inline bool arch_static_branch(struct static_key * const key, 28 const bool branch) 29 { 30 char *k = &((char *)key)[branch]; 31 32 asm goto( 33 "1: nop \n\t" 34 JUMP_TABLE_ENTRY(k, l_yes) 35 ); 36 37 return false; 38 l_yes: 39 return true; 40 } 41 42 static __always_inline bool arch_static_branch_jump(struct static_key * const key, 43 const bool branch) 44 { 45 char *k = &((char *)key)[branch]; 46 asm goto( 47 "1: b %l[l_yes] \n\t" 48 JUMP_TABLE_ENTRY(k, l_yes) 49 ); 50 return false; 51 l_yes: 52 return true; 53 } 54 55 #endif /* __ASSEMBLY__ */ 56 #endif /* __ASM_JUMP_LABEL_H */ 57