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 HAVE_JUMP_LABEL_BATCH 16 17 #define JUMP_LABEL_NOP_SIZE 4 18 19 static __always_inline bool arch_static_branch(struct static_key * const key, 20 const bool branch) 21 { 22 asm goto( 23 " .align 2 \n\t" 24 " .option push \n\t" 25 " .option norelax \n\t" 26 " .option norvc \n\t" 27 "1: nop \n\t" 28 " .option pop \n\t" 29 " .pushsection __jump_table, \"aw\" \n\t" 30 " .align " RISCV_LGPTR " \n\t" 31 " .long 1b - ., %l[label] - . \n\t" 32 " " RISCV_PTR " %0 - . \n\t" 33 " .popsection \n\t" 34 : : "i"(&((char *)key)[branch]) : : label); 35 36 return false; 37 label: 38 return true; 39 } 40 41 static __always_inline bool arch_static_branch_jump(struct static_key * const key, 42 const bool branch) 43 { 44 asm goto( 45 " .align 2 \n\t" 46 " .option push \n\t" 47 " .option norelax \n\t" 48 " .option norvc \n\t" 49 "1: j %l[label] \n\t" 50 " .option pop \n\t" 51 " .pushsection __jump_table, \"aw\" \n\t" 52 " .align " RISCV_LGPTR " \n\t" 53 " .long 1b - ., %l[label] - . \n\t" 54 " " RISCV_PTR " %0 - . \n\t" 55 " .popsection \n\t" 56 : : "i"(&((char *)key)[branch]) : : label); 57 58 return false; 59 label: 60 return true; 61 } 62 63 #endif /* __ASSEMBLY__ */ 64 #endif /* __ASM_JUMP_LABEL_H */ 65