call_o32_Ep_mem.java

/*
    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 org.jpc.emulator.execution.opcodes.pm;

import org.jpc.emulator.execution.*;
import org.jpc.emulator.execution.decoder.*;
import org.jpc.emulator.processor.*;
import org.jpc.emulator.processor.fpu64.*;
import static org.jpc.emulator.processor.Processor.*;

public class call_o32_Ep_mem extends Executable
{
        final Pointer offset;
    final int blockLength;
    final int instructionLength;

    public call_o32_Ep_mem(int blockStart, int eip, int prefices, PeekableInputStream input)
    {
        super(blockStart, eip);
        int modrm = input.readU8();
        offset = Modrm.getPointer(prefices, modrm, input);
        instructionLength = (int)input.getAddress()-eip;
        blockLength = eip-blockStart+instructionLength;
    }

    public Branch execute(Processor cpu)
    {
        int cs = offset.get16(cpu, 4);
        int targetEip = offset.get32(cpu);
                cpu.eip += blockLength;
        if (!cpu.ss.getDefaultSizeFlag())
            cpu.call_far_pm_o32_a16(0xffff & cs, targetEip);
        else
            cpu.call_far_pm_o32_a32(0xffff & cs, targetEip);
        return Branch.Call_Unknown;
    }

    public boolean isBranch()
    {
        return true;
    }

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