public void Parse(Emulator emu)
{
mod = 0;
opcode = regIndex = 0;
rm = 0;
sib = 0;
disp32 = disp8 = 0;
Byte code;
code = (Byte)emu.getCode8(0);
mod = (Byte)((code & 0xC0) >> 6);
opcode = regIndex = (Byte)((code & 0x38) >> 3);
rm = (Byte)(code & 0x07);
emu.eip++;
if (mod != 0x03 && rm == 0x04)
{
sib = (Byte)emu.getCode8(0);
emu.eip++;
}
if ((mod == 0x00 && rm == 0x05) || mod == 0x02)
{
disp32 = emu.getCode32(0);
emu.eip += 4;
}
else if (mod == 0x01)
{
disp8 = (Byte)emu.getCode8(0);
emu.eip += 1;
}
}
// opcode 0x68
public static void push_imm32(Emulator emu)
{
UInt32 value = emu.getCode32(1);
emu.push32(value);
emu.eip += 5;
}
// opcode 0xC7
public static void mov_r32_imm32(Emulator emu)
{
Byte reg = (Byte)(emu.getCode8(0) - 0xB8);
UInt32 value = emu.getCode32(1);
emu.registers[reg] = value;
emu.eip += 5;
}
// opcode 0xB8～0xBF
public static void mov_rm32_imm32(Emulator emu)
{
emu.eip++;
ModRM modrm = new ModRM();
modrm.Parse(emu);
UInt32 value = emu.getCode32(0);
emu.eip += 4;
modrm.set_rm32(emu, value);
}