// opcode 0x83
public static void code_83(Emulator emu)
{
emu.eip += 1;
ModRM modrm = new ModRM();
modrm.Parse(emu);
switch (modrm.opcode)
{
case 0:
add_rm32_imm8(emu, modrm);
break;
case 5:
sub_rm32_imm8(emu, modrm);
break;
case 7:
cmp_rm32_imm8(emu, modrm);
break;
default:
Console.WriteLine("not implemented: 83 /%d", modrm.opcode);
System.Environment.Exit(0);
break;
}
}
private static void add_rm32_imm8(Emulator emu, ModRM modrm)
{
UInt32 rm32 = modrm.get_rm32(emu);
UInt32 imm8 = (UInt32)emu.getSignedCode8(0);
emu.eip += 1;
modrm.set_rm32(emu, rm32 + imm8);
}
// opcode 0x8B
public static void mov_r32_rm32(Emulator emu)
{
emu.eip += 1;
ModRM modrm = new ModRM();
modrm.Parse(emu);
UInt32 rm32 = modrm.get_rm32(emu);
modrm.set_r32(emu, rm32);
}
static void cmp_rm32_imm8(Emulator emu, ModRM modrm)
{
UInt32 rm32 = modrm.get_rm32(emu);
UInt32 imm8 = (UInt32)emu.getSignedCode8(0);
emu.eip += 1;
UInt64 result = (UInt64)rm32 - (UInt64)imm8;
emu.update_eflags_sub(rm32, imm8, result);
}
// 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);
}
// opcode 0x3B
public static void cmp_r32_rm32(Emulator emu)
{
emu.eip += 1;
ModRM modrm = new ModRM();
modrm.Parse(emu);
UInt32 r32 = modrm.get_r32(emu);
UInt32 rm32 = modrm.get_rm32(emu);
UInt64 result = (UInt64)r32 - (UInt64)rm32;
emu.update_eflags_sub(r32, rm32, result);
}
// opcode 0xFF
public static void code_ff(Emulator emu)
{
emu.eip += 1;
ModRM modrm = new ModRM();
modrm.Parse(emu);
switch (modrm.opcode)
{
case 0:
inc_rm32(emu, modrm);
break;
default:
Console.WriteLine("not implemented: 83 /%d", modrm.opcode);
System.Environment.Exit(1);
break;
}
}
private static void inc_rm32(Emulator emu, ModRM modrm)
{
UInt32 value = modrm.get_rm32(emu);
modrm.set_rm32(emu, value + 1);
}