/* 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 __ASSEMBLER__

#include <linux/types.h>
#include <asm/asm.h>

#define HAVE_JUMP_LABEL_BATCH

#define JUMP_LABEL_NOP_SIZE 4

#define JUMP_TABLE_ENTRY(key, label)                    \
        ".pushsection   __jump_table, \"aw\"    \n\t"   \
        ".align         " RISCV_LGPTR "         \n\t"   \
        ".long          1b - ., " label " - .   \n\t"   \
        "" RISCV_PTR "  " key " - .             \n\t"   \
        ".popsection                            \n\t"

/* This macro is also expanded on the Rust side. */
#define ARCH_STATIC_BRANCH_ASM(key, label)              \
        "       .align          2               \n\t"   \
        "       .option push                    \n\t"   \
        "       .option norelax                 \n\t"   \
        "       .option norvc                   \n\t"   \
        "1:     nop                             \n\t"   \
        "       .option pop                     \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[label]")
                :  :  "i"(&((char *)key)[branch]) :  : label);

        return false;
label:
        return true;
}

#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label)         \
        "       .align          2               \n\t"   \
        "       .option push                    \n\t"   \
        "       .option norelax                 \n\t"   \
        "       .option norvc                   \n\t"   \
        "1:     j       " label "               \n\t" \
        "       .option pop                     \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[label]")
                :  :  "i"(&((char *)key)[branch]) :  : label);

        return false;
label:
        return true;
}

#endif  /* __ASSEMBLER__ */
#endif  /* __ASM_JUMP_LABEL_H */