target/loongarch/op_helper.c


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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * LoongArch emulation helpers for QEMU.
 *
 * Copyright (c) 2021 Loongson Technology Corporation Limited
 */

#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "cpu.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "internals.h"

/* Exceptions helpers */
void helper_raise_exception(CPULoongArchState *env, uint32_t exception)
{
    do_raise_exception(env, exception, GETPC());
}

target_ulong helper_bitrev_w(target_ulong rj)
{
    return (int32_t)revbit32(rj);
}

target_ulong helper_bitrev_d(target_ulong rj)
{
    return revbit64(rj);
}

target_ulong helper_bitswap(target_ulong v)
{
    v = ((v >> 1) & (target_ulong)0x5555555555555555ULL) |
        ((v & (target_ulong)0x5555555555555555ULL) << 1);
    v = ((v >> 2) & (target_ulong)0x3333333333333333ULL) |
        ((v & (target_ulong)0x3333333333333333ULL) << 2);
    v = ((v >> 4) & (target_ulong)0x0F0F0F0F0F0F0F0FULL) |
        ((v & (target_ulong)0x0F0F0F0F0F0F0F0FULL) << 4);
    return v;
}