1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2020 Emil Renner Berthing 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 #include <asm/asm.h> 14 15 #define JUMP_LABEL_NOP_SIZE 4 16 17 static __always_inline bool arch_static_branch(struct static_key * const key, 18 const bool branch) 19 { 20 asm goto( 21 " .align 2 \n\t" 22 " .option push \n\t" 23 " .option norelax \n\t" 24 " .option norvc \n\t" 25 "1: nop \n\t" 26 " .option pop \n\t" 27 " .pushsection __jump_table, \"aw\" \n\t" 28 " .align " RISCV_LGPTR " \n\t" 29 " .long 1b - ., %l[label] - . \n\t" 30 " " RISCV_PTR " %0 - . \n\t" 31 " .popsection \n\t" 32 : : "i"(&((char *)key)[branch]) : : label); 33 34 return false; 35 label: 36 return true; 37 } 38 39 static __always_inline bool arch_static_branch_jump(struct static_key * const key, 40 const bool branch) 41 { 42 asm goto( 43 " .align 2 \n\t" 44 " .option push \n\t" 45 " .option norelax \n\t" 46 " .option norvc \n\t" 47 "1: jal zero, %l[label] \n\t" 48 " .option pop \n\t" 49 " .pushsection __jump_table, \"aw\" \n\t" 50 " .align " RISCV_LGPTR " \n\t" 51 " .long 1b - ., %l[label] - . \n\t" 52 " " RISCV_PTR " %0 - . \n\t" 53 " .popsection \n\t" 54 : : "i"(&((char *)key)[branch]) : : label); 55 56 return false; 57 label: 58 return true; 59 } 60 61 #endif /* __ASSEMBLY__ */ 62 #endif /* __ASM_JUMP_LABEL_H */ 63