public UInt32 calc_memory_address(Emulator emu)
{
if (mod == 0x00)
{
if (rm == 0x04)
{
Console.WriteLine("not implemented ModRM mod = 0x00, rm = 0x04");
Environment.Exit(0);
}
else if (rm == 5)
{
return(disp32);
}
else
{
return(emu.getRegister32(rm));
}
}
else if (mod == 0x01)
{
if (rm == 4)
{
Console.WriteLine("not implemented ModRM mod = 0x01, rm = 0x04");
Environment.Exit(0);
}
else
{
return(emu.getRegister32(rm) + disp8);
}
}
else if (mod == 0x02)
{
if (rm == 0x04)
{
Console.WriteLine("not implemented ModRM mod = 0x02, rm = 0x04");
Environment.Exit(0);
}
else
{
return(emu.getRegister32(rm) + disp32);
}
}
else
{
Console.WriteLine("not implemented ModRM mod = 0x03");
Environment.Exit(0);
}
return(0);
}
// opcode 0x50-0x57
public static void push_r32(Emulator emu)
{
Byte reg = (Byte)(emu.getCode8(0) - 0x50);
emu.push32(emu.getRegister32(reg));
emu.eip += 1;
}
public static void leave(Emulator emu)
{
UInt32 ebp = emu.getRegister32((int)Registers.EBP);
emu.setRegister32((int)Registers.ESP, ebp);
emu.setRegister32((int)Registers.EBP, emu.pop32());
emu.eip += 1;
}
public UInt32 get_rm32(Emulator emu)
{
if (mod == 0x03)
{
return(emu.getRegister32(rm));
}
else
{
UInt32 address = calc_memory_address(emu);
return(emu.getMemory32(address));
}
}
public UInt32 get_r32(Emulator emu)
{
return(emu.getRegister32(regIndex));
}