/*
    JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine

    Copyright (C) 2012-2013 Ian Preston

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2 as published by
    the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
    Details (including contact information) can be found at: 

    jpc.sourceforge.net
    or the developer website
    sourceforge.net/projects/jpc/

    End of licence header
*/

package com.github.smeny.jpc.emulator.execution.opcodes.rm;

import com.github.smeny.jpc.emulator.execution.*;
import com.github.smeny.jpc.emulator.execution.decoder.*;
import com.github.smeny.jpc.emulator.processor.*;
import com.github.smeny.jpc.emulator.processor.fpu64.*;
import static com.github.smeny.jpc.emulator.processor.Processor.*;

public class div_Ew_mem extends Executable
{
    final Pointer op1;

    public div_Ew_mem(int blockStart, int eip, int prefices, PeekableInputStream input)
    {
        super(blockStart, eip);
        int modrm = input.readU8();
        op1 = Modrm.getPointer(prefices, modrm, input);
    }

    public Branch execute(Processor cpu)
    {
        if (op1.get16(cpu) == 0)
            throw ProcessorException.DIVIDE_ERROR;
        long ldiv = ((0xffffL & cpu.r_edx.get16()) << 16 ) | (0xFFFF& cpu.r_eax.get16());
        int quot32 = (int)(ldiv / (0xFFFF& op1.get16(cpu)));
        if (quot32 != (quot32 & 0xffff))
            throw ProcessorException.DIVIDE_ERROR;
        cpu.r_eax.set16((short) quot32);
        cpu.r_edx.set16((short) (ldiv % (0xFFFF& op1.get16(cpu))));
        return Branch.None;
    }

    public boolean isBranch()
    {
        return false;
    }

    public String toString()
    {
        return this.getClass().getName();
    }
}