/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2025 Chen Miao * * Based on arch/arm/include/asm/jump_label.h */ #ifndef __ASM_OPENRISC_JUMP_LABEL_H #define __ASM_OPENRISC_JUMP_LABEL_H #ifndef __ASSEMBLER__ #include <linux/types.h> #include <asm/insn-def.h> #define HAVE_JUMP_LABEL_BATCH #define JUMP_LABEL_NOP_SIZE OPENRISC_INSN_SIZE /** * JUMP_TABLE_ENTRY - Create a jump table entry * @key: Jump key identifier (typically a symbol address) * @label: Target label address * * This macro creates a jump table entry in the dedicated kernel section (__jump_table). * Each entry contains the following information: * Offset from current instruction to jump instruction (1b - .) * Offset from current instruction to target label (label - .) * Offset from current instruction to key identifier (key - .) */ #define JUMP_TABLE_ENTRY(key, label) \ ".pushsection __jump_table, \"aw\" \n\t" \ ".align 4 \n\t" \ ".long 1b - ., " label " - . \n\t" \ ".long " key " - . \n\t" \ ".popsection \n\t" #define ARCH_STATIC_BRANCH_ASM(key, label) \ ".align 4 \n\t" \ "1: l.nop \n\t" \ " l.nop \n\t" \ JUMP_TABLE_ENTRY(key, label) static __always_inline bool arch_static_branch(struct static_key *const key, const bool branch) { asm goto (ARCH_STATIC_BRANCH_ASM("%0", "%l[l_yes]") ::"i"(&((char *)key)[branch])::l_yes); return false; l_yes: return true; } #define ARCH_STATIC_BRANCH_JUMP_ASM(key, label) \ ".align 4 \n\t" \ "1: l.j " label " \n\t" \ " l.nop \n\t" \ JUMP_TABLE_ENTRY(key, label) static __always_inline bool arch_static_branch_jump(struct static_key *const key, const bool branch) { asm goto (ARCH_STATIC_BRANCH_JUMP_ASM("%0", "%l[l_yes]") ::"i"(&((char *)key)[branch])::l_yes); return false; l_yes: return true; } #endif /* __ASSEMBLER__ */ #endif /* __ASM_OPENRISC_JUMP_LABEL_H */