/* 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 */