/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2020 Emil Renner Berthing * * Based on arch/arm64/include/asm/jump_label.h */ #ifndef __ASM_JUMP_LABEL_H #define __ASM_JUMP_LABEL_H #ifndef __ASSEMBLY__ #include <linux/types.h> #include <asm/asm.h> #define JUMP_LABEL_NOP_SIZE 4 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch) { asm_volatile_goto( " .align 2 \n\t" " .option push \n\t" " .option norelax \n\t" " .option norvc \n\t" "1: nop \n\t" " .option pop \n\t" " .pushsection __jump_table, \"aw\" \n\t" " .align " RISCV_LGPTR " \n\t" " .long 1b - ., %l[label] - . \n\t" " " RISCV_PTR " %0 - . \n\t" " .popsection \n\t" : : "i"(&((char *)key)[branch]) : : label); return false; label: return true; } static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch) { asm_volatile_goto( " .align 2 \n\t" " .option push \n\t" " .option norelax \n\t" " .option norvc \n\t" "1: jal zero, %l[label] \n\t" " .option pop \n\t" " .pushsection __jump_table, \"aw\" \n\t" " .align " RISCV_LGPTR " \n\t" " .long 1b - ., %l[label] - . \n\t" " " RISCV_PTR " %0 - . \n\t" " .popsection \n\t" : : "i"(&((char *)key)[branch]) : : label); return false; label: return true; } #endif /* __ASSEMBLY__ */ #endif /* __ASM_JUMP_LABEL_H */