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 JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE 17 18 static __always_inline bool arch_static_branch(struct static_key * const key, 19 const bool branch) 20 { 21 asm_volatile_goto( 22 "1: nop \n\t" 23 " .pushsection __jump_table, \"aw\" \n\t" 24 " .align 3 \n\t" 25 " .long 1b - ., %l[l_yes] - . \n\t" 26 " .quad %c0 - . \n\t" 27 " .popsection \n\t" 28 : : "i"(&((char *)key)[branch]) : : l_yes); 29 30 return false; 31 l_yes: 32 return true; 33 } 34 35 static __always_inline bool arch_static_branch_jump(struct static_key * const key, 36 const bool branch) 37 { 38 asm_volatile_goto( 39 "1: b %l[l_yes] \n\t" 40 " .pushsection __jump_table, \"aw\" \n\t" 41 " .align 3 \n\t" 42 " .long 1b - ., %l[l_yes] - . \n\t" 43 " .quad %c0 - . \n\t" 44 " .popsection \n\t" 45 : : "i"(&((char *)key)[branch]) : : l_yes); 46 47 return false; 48 l_yes: 49 return true; 50 } 51 52 #endif /* __ASSEMBLY__ */ 53 #endif /* __ASM_JUMP_LABEL_H */ 54