/// <summary>
/// returns the length of the instruction
/// </summary>
/// <param name="data">ram</param>
/// <param name="index">where to disassemble</param>
/// <param name="dasm">dasm</param>
/// <returns></returns>
static int ParseInstruction(byte[] data, int index, DASMData dasm)
{
//copy the data into
byte[] ir = new byte[5];
for (int i = 0; i < 5; i++)
{
if (i + index >= data.Length)
{
break;
}
ir[i] = data[i + index];
}
Decode(ir, dasm);
GetOpCodeText(dasm);
return(dasm.TotalBytes);
}
/// <summary>
/// populates dasm with disassembly
/// </summary>
/// <param name="data"></param>
/// <param name=""></param>
public static void Disassemble(byte[] data, int index, List <string> lines)
{
List <Tuple <string, string> > statement = new List <Tuple <string, string> >();
int len = 0;
//get the 1st opcode btyte
for (int i = 0; i < 30; i++)
{
DASMData dasm = new DASMData();
len = ParseInstruction(data, index, dasm);
index += len;
if (len == 0)
{
break;
}
lines.Add(dasm.Text);
}
}
/// <summary>
/// returns the length
/// </summary>
/// <param name="ir"></param>
/// <returns></returns>
public static void Decode(byte[] ir, DASMData data)
{
byte x, y, z, p, q;
//x is 2 highest bits
x = (byte)(ir[0] & (byte)0xC0);
x = (byte)(x >> 6);
//y = bits 5,4,3
y = (byte)(ir[0] & 0x38); /* 00111000 */
y = (byte)(y >> 3);
//z = lowest three bits
z = (byte)(ir[0] & 0x07);
/*p is bits 4,5*/
p = (byte)(ir[0] & 0x30);
p = (byte)(p >> 4);
/*q = bit 3*/
q = (byte)(ir[0] & 0x08);
q = (byte)(q >> 3);
if (IsPrefix(ir) == false)
{//1 byte op code
data.OpCode = ir[0];
data.OpCodeLength = 1;
data.TotalBytes = 1;
if (HasImmediateByte(x, y, z))
{
data.ImmediateByte1 = ir[1];
data.ImmediateSize = 1;
data.TotalBytes = 2;
}
else if (HasImmediateWord(p, q, x, y, z) == true)
{
data.ImmediateWord = (ushort)(ir[1] * 256 + ir[2]);
data.OpCodeLength = 1;
data.TotalBytes = 3;
}
else
{
data.ImmediateSize = 0;
}
}
else
{//is a prefix (2 byte opcode)
data.OpCodeLength = 2;
data.OpCode = (ushort)(ir[0] * 256 + ir[1]);
//how do we figure out if there's 0,1,or 2 immediates?
if (PrefixedWithImmediateByte(ir))
{//1 byte immediate
data.ImmediateByte1 = ir[2];
data.NumOperands = 1;
data.ImmediateSize = 1;
data.TotalBytes = 3;
}
else if (PrefixedWith2ImmediateBytes(ir))
{//2 immediates (bit (ix+d),n)
data.ImmediateByte1 = ir[2];
data.ImmediateByte2 = ir[3];
data.NumOperands = 2;
data.ImmediateSize = 1;
data.TotalBytes = 4;
}
else if (PrefixedWithImmediateWord(ir))
{//2 immediates (ld ix,nn)
data.ImmediateByte1 = ir[2];
data.ImmediateByte2 = ir[3];
data.NumOperands = 2;
data.ImmediateSize = 1;
data.TotalBytes = 4;
}
else
{
data.TotalBytes = 2;
data.NumOperands = 0;
data.ImmediateSize = 0;
}
}
}
static bool GetOpCodeText(DASMData data, Dictionary <string, ushort> labels = null)
{
// r,r instructions (no immediates)
if (data.OpCode == 0x00)
{
data.Text = "nop";
}
else if (data.OpCode == 0x86)
{
data.Text = "add a,(hl)";
}
else if (data.OpCode == 0x87)
{
data.Text = "add a,a";
}
else if (data.OpCode == 0x80)
{
data.Text = "add a,b";
}
else if (data.OpCode == 0x81)
{
data.Text = "add a,c";
}
else if (data.OpCode == 0x82)
{
data.Text = "add a,d";
}
else if (data.OpCode == 0x83)
{
data.Text = "add a,e";
}
else if (data.OpCode == 0x84)
{
data.Text = "add a,h";
}
else if (data.OpCode == 0x85)
{
data.Text = "add a,l";
}
else if (data.OpCode == 0x09)
{
data.Text = "add hl,bc";
}
else if (data.OpCode == 0x19)
{
data.Text = "add hl,de";
}
else if (data.OpCode == 0x29)
{
data.Text = "add hl,hl";
}
else if (data.OpCode == 0x39)
{
data.Text = "add hl,sp";
}
else if (data.OpCode == 0xA6)
{
data.Text = "and a,(hl)";
}
else if (data.OpCode == 0xA7)
{
data.Text = "and a,a";
}
else if (data.OpCode == 0xA0)
{
data.Text = "and a,b";
}
else if (data.OpCode == 0xA1)
{
data.Text = "and a,c";
}
else if (data.OpCode == 0xA2)
{
data.Text = "and a,d";
}
else if (data.OpCode == 0xA3)
{
data.Text = "and a,e";
}
else if (data.OpCode == 0xA4)
{
data.Text = "and a,h";
}
else if (data.OpCode == 0xA5)
{
data.Text = "and a,l";
}
else if (data.OpCode == 0xBE)
{
data.Text = "cp (hl)";
}
else if (data.OpCode == 0xBF)
{
data.Text = "cp a";
}
else if (data.OpCode == 0xB8)
{
data.Text = "cp b";
}
else if (data.OpCode == 0xB9)
{
data.Text = "cp c";
}
else if (data.OpCode == 0xBA)
{
data.Text = "cp d";
}
else if (data.OpCode == 0xBB)
{
data.Text = "cp e";
}
else if (data.OpCode == 0xBC)
{
data.Text = "cp h";
}
else if (data.OpCode == 0xBD)
{
data.Text = "cp l";
}
else if (data.OpCode == 0x2F)
{
data.Text = "cpl";
}
else if (data.OpCode == 0x35)
{
data.Text = "dec (hl)";
}
else if (data.OpCode == 0x3D)
{
data.Text = "dec a";
}
else if (data.OpCode == 0x05)
{
data.Text = "dec b";
}
else if (data.OpCode == 0x0B)
{
data.Text = "dec bc";
}
else if (data.OpCode == 0x0D)
{
data.Text = "dec c";
}
else if (data.OpCode == 0x15)
{
data.Text = "dec d";
}
else if (data.OpCode == 0x1B)
{
data.Text = "dec de";
}
else if (data.OpCode == 0x1D)
{
data.Text = "dec e";
}
else if (data.OpCode == 0x25)
{
data.Text = "dec h";
}
else if (data.OpCode == 0x2B)
{
data.Text = "dec hl";
}
else if (data.OpCode == 0x2D)
{
data.Text = "dec l";
}
else if (data.OpCode == 0x3B)
{
data.Text = "dec sp";
}
else if (data.OpCode == 0x34)
{
data.Text = "inc (hl)";
}
else if (data.OpCode == 0x3C)
{
data.Text = "inc a";
}
else if (data.OpCode == 0x04)
{
data.Text = "inc b";
}
else if (data.OpCode == 0x03)
{
data.Text = "inc bc";
}
else if (data.OpCode == 0x0C)
{
data.Text = "inc c";
}
else if (data.OpCode == 0x14)
{
data.Text = "inc d";
}
else if (data.OpCode == 0x13)
{
data.Text = "inc de";
}
else if (data.OpCode == 0x1c)
{
data.Text = "inc e";
}
else if (data.OpCode == 0x24)
{
data.Text = "inc h";
}
else if (data.OpCode == 0x23)
{
data.Text = "inc hl";
}
else if (data.OpCode == 0x2c)
{
data.Text = "inc l";
}
else if (data.OpCode == 0x33)
{
data.Text = "inc sp";
}
else if (data.OpCode == 0xE9)
{
data.Text = "jp (hl)";
}
else if (data.OpCode == 0x02)
{
data.Text = "ld (bc),a";
}
else if (data.OpCode == 0x12)
{
data.Text = "ld (de),a";
}
else if (data.OpCode == 0x77)
{
data.Text = "ld (hl),a";
}
else if (data.OpCode == 0x70)
{
data.Text = "ld (hl),b";
}
else if (data.OpCode == 0x71)
{
data.Text = "ld (hl),c";
}
else if (data.OpCode == 0x72)
{
data.Text = "ld (hl),d";
}
else if (data.OpCode == 0x73)
{
data.Text = "ld (hl),e";
}
else if (data.OpCode == 0x74)
{
data.Text = "ld (hl),h";
}
else if (data.OpCode == 0x75)
{
data.Text = "ld (hl),l";
}
else if (data.OpCode == 0x02)
{
data.Text = "ld (bc),a";
}
else if (data.OpCode == 0x12)
{
data.Text = "ld (de),a";
}
else if (data.OpCode == 0x77)
{
data.Text = "ld (hl),a";
}
else if (data.OpCode == 0x70)
{
data.Text = "ld (hl),b";
}
else if (data.OpCode == 0x71)
{
data.Text = "ld (hl),c";
}
else if (data.OpCode == 0x72)
{
data.Text = "ld (hl),d";
}
else if (data.OpCode == 0x73)
{
data.Text = "ld (hl),e";
}
else if (data.OpCode == 0x74)
{
data.Text = "ld (hl),h";
}
else if (data.OpCode == 0x75)
{
data.Text = "ld (hl),l";
}
else if (data.OpCode == 0x0A)
{
data.Text = "ld a,(bc)";
}
else if (data.OpCode == 0x1A)
{
data.Text = "ld a,(de)";
}
else if (data.OpCode == 0x7E)
{
data.Text = "ld a,(hl)";
}
else if (data.OpCode == 0x7F)
{
data.Text = "ld a,a";
}
else if (data.OpCode == 0x78)
{
data.Text = "ld a,b";
}
else if (data.OpCode == 0x79)
{
data.Text = "ld a,c";
}
else if (data.OpCode == 0x7A)
{
data.Text = "ld a,d";
}
else if (data.OpCode == 0x7B)
{
data.Text = "ld a,e";
}
else if (data.OpCode == 0x7C)
{
data.Text = "ld a,h";
}
else if (data.OpCode == 0x7D)
{
data.Text = "ld a,l";
}
// ld b,r
else if (data.OpCode == 0x47)
{
data.Text = "ld b,a";
}
else if (data.OpCode == 0x40)
{
data.Text = "ld b,b";
}
else if (data.OpCode == 0x41)
{
data.Text = "ld b,c";
}
else if (data.OpCode == 0x42)
{
data.Text = "ld b,d";
}
else if (data.OpCode == 0x43)
{
data.Text = "ld b,e";
}
else if (data.OpCode == 0x44)
{
data.Text = "ld b,h";
}
else if (data.OpCode == 0x45)
{
data.Text = "ld b,l";
}
else if (data.OpCode == 0x46)
{
data.Text = "ld b,(hl)";
}
//ld c,r
else if (data.OpCode == 0x4f)
{
data.Text = "ld c,a";
}
else if (data.OpCode == 0x48)
{
data.Text = "ld c,b";
}
else if (data.OpCode == 0x49)
{
data.Text = "ld c,c";
}
else if (data.OpCode == 0x4a)
{
data.Text = "ld c,d";
}
else if (data.OpCode == 0x4b)
{
data.Text = "ld c,e";
}
else if (data.OpCode == 0x4c)
{
data.Text = "ld c,h";
}
else if (data.OpCode == 0x4d)
{
data.Text = "ld c,l";
}
else if (data.OpCode == 0x4e)
{
data.Text = "ld c,(hl)";
}
//ld d,r
else if (data.OpCode == 0x57)
{
data.Text = "ld d,a";
}
else if (data.OpCode == 0x50)
{
data.Text = "ld d,b";
}
else if (data.OpCode == 0x51)
{
data.Text = "ld d,c";
}
else if (data.OpCode == 0x52)
{
data.Text = "ld d,d";
}
else if (data.OpCode == 0x53)
{
data.Text = "ld d,e";
}
else if (data.OpCode == 0x54)
{
data.Text = "ld d,h";
}
else if (data.OpCode == 0x55)
{
data.Text = "ld d,l";
}
else if (data.OpCode == 0x56)
{
data.Text = "ld d,(hl)";
}
//ld e,r
else if (data.OpCode == 0x5F)
{
data.Text = "ld e,a";
}
else if (data.OpCode == 0x58)
{
data.Text = "ld e,b";
}
else if (data.OpCode == 0x59)
{
data.Text = "ld e,c";
}
else if (data.OpCode == 0x5A)
{
data.Text = "ld e,d";
}
else if (data.OpCode == 0x5B)
{
data.Text = "ld e,e";
}
else if (data.OpCode == 0x5C)
{
data.Text = "ld e,h";
}
else if (data.OpCode == 0x5D)
{
data.Text = "ld e,l";
}
else if (data.OpCode == 0x5E)
{
data.Text = "ld e,(hl)";
}
//ld h,r
else if (data.OpCode == 0x67)
{
data.Text = "ld h,a";
}
else if (data.OpCode == 0x60)
{
data.Text = "ld h,b";
}
else if (data.OpCode == 0x61)
{
data.Text = "ld h,c";
}
else if (data.OpCode == 0x62)
{
data.Text = "ld h,d";
}
else if (data.OpCode == 0x63)
{
data.Text = "ld h,e";
}
else if (data.OpCode == 0x64)
{
data.Text = "ld h,h";
}
else if (data.OpCode == 0x65)
{
data.Text = "ld h,l";
}
else if (data.OpCode == 0x66)
{
data.Text = "ld h,(hl)";
}
//ld l,r
else if (data.OpCode == 0x6F)
{
data.Text = "ld l,a";
}
else if (data.OpCode == 0x68)
{
data.Text = "ld l,b";
}
else if (data.OpCode == 0x69)
{
data.Text = "ld l,c";
}
else if (data.OpCode == 0x6A)
{
data.Text = "ld l,d";
}
else if (data.OpCode == 0x6B)
{
data.Text = "ld l,e";
}
else if (data.OpCode == 0x6C)
{
data.Text = "ld l,h";
}
else if (data.OpCode == 0x6D)
{
data.Text = "ld l,l";
}
else if (data.OpCode == 0x6E)
{
data.Text = "ld l,(hl)";
}
//or r,r
else if (data.OpCode == 0xB7)
{
data.Text = "ld l,a";
}
else if (data.OpCode == 0xB0)
{
data.Text = "ld l,b";
}
else if (data.OpCode == 0xB1)
{
data.Text = "ld l,c";
}
else if (data.OpCode == 0xB2)
{
data.Text = "ld l,d";
}
else if (data.OpCode == 0xB3)
{
data.Text = "ld l,e";
}
else if (data.OpCode == 0xB4)
{
data.Text = "ld l,h";
}
else if (data.OpCode == 0xB5)
{
data.Text = "ld l,l";
}
else if (data.OpCode == 0xB6)
{
data.Text = "or (hl)";
}
else if (data.OpCode == 0xF1)
{
data.Text = "pop af";
}
else if (data.OpCode == 0xC1)
{
data.Text = "pop bc";
}
else if (data.OpCode == 0xD1)
{
data.Text = "pop de";
}
else if (data.OpCode == 0xE1)
{
data.Text = "pop hl";
}
else if (data.OpCode == 0xF5)
{
data.Text = "push af";
}
else if (data.OpCode == 0xC5)
{
data.Text = "push bc";
}
else if (data.OpCode == 0xD5)
{
data.Text = "push de";
}
else if (data.OpCode == 0xE5)
{
data.Text = "push hl";
}
else if (data.OpCode == 0xc8)
{
data.Text = "retz";
}
else if (data.OpCode == 0xc9)
{
data.Text = "ret";
}
//2 byte no immediate instructions
else if (data.OpCode == 0xdd09)
{
data.Text = "add ix,bc";
}
else if (data.OpCode == 0xdd19)
{
data.Text = "add ix,de";
}
else if (data.OpCode == 0xfd09)
{
data.Text = "add iy,bc";
}
else if (data.OpCode == 0xfd19)
{
data.Text = "add iy,de";
}
else if (data.OpCode == 0xdd2B)
{
data.Text = "dec ix";
}
else if (data.OpCode == 0xfd2B)
{
data.Text = "dec iy";
}
else if (data.OpCode == 0xf3)
{
data.Text = "di";
}
else if (data.OpCode == 0xfB)
{
data.Text = "ei";
}
else if (data.OpCode == 0xdd2B)
{
data.Text = "inc ix";
}
else if (data.OpCode == 0xdd2B)
{
data.Text = "inc iy";
}
else if (data.OpCode == 0xed80)
{
data.Text = "neg";
}
else if (data.OpCode == 0xed80)
{
data.Text = "ldir";
}
else if (data.OpCode == 0xdde1)
{
data.Text = "pop ix";
}
else if (data.OpCode == 0xfde1)
{
data.Text = "pop iy";
}
else if (data.OpCode == 0xdde5)
{
data.Text = "push ix";
}
else if (data.OpCode == 0xfde5)
{
data.Text = "push iy";
}
else if (data.OpCode == 0xcb21)
{
data.Text = "sla c";
}
else if (data.OpCode == 0xcb2f)
{
data.Text = "sra";
}
else if (data.OpCode == 0xcb3f)
{
data.Text = "srl";
}
else if (data.OpCode == 0xEDB8)
{
data.Text = "cls";
}
else if (data.OpCode == 0xed79)
{
data.Text = "outlin";
}
else if (data.OpCode == 0xed41)
{
data.Text = "setp";
}
else if (data.OpCode == 0xedb3)
{
data.Text = "newln";
}
else if (data.OpCode == 0xed59)
{
data.Text = "quit";
}
else if (data.OpCode == 0xed61)
{
data.Text = "save";
}
else if (data.OpCode == 0xed69)
{
data.Text = "restore";
}
else if (data.OpCode == 0xed51)
{
data.Text = "readkb";
}
else if (data.OpCode == 0xEDAB)
{
data.Text = "stsln";
}
// r,n instructions
else if (data.OpCode == 0xc6)
{
data.Text = String.Format("add {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0xe6)
{
data.Text = String.Format("and {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0xfe)
{
data.Text = String.Format("cp {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x3e)
{
data.Text = String.Format("ld {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x06)
{
data.Text = String.Format("ld b,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x0e)
{
data.Text = String.Format("ld c,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x16)
{
data.Text = String.Format("ld d,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x1e)
{
data.Text = String.Format("ld e,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x26)
{
data.Text = String.Format("ld h,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x2E)
{
data.Text = String.Format("ld l,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0xf6)
{
data.Text = String.Format("or {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0xd6)
{
data.Text = String.Format("sub {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0xee)
{
data.Text = String.Format("xor {0:X2}", data.ImmediateByte1);
}
//relative jumps
else if (data.OpCode == 0x18)
{
data.Text = String.Format("jr {0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x38)
{
data.Text = String.Format("jr c,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x30)
{
data.Text = String.Format("jr nc,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x28)
{
data.Text = String.Format("jr z,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x20)
{
data.Text = String.Format("jr nz,{0:X2}", data.ImmediateByte1);
}
else if (data.OpCode == 0x10)
{
data.Text = String.Format("djnz {0:X2}", data.ImmediateByte1);
}
//call instructions
else if (data.OpCode == 0xC4)
{
data.Text = "call nz," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xCC)
{
data.Text = "call z," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xCD)
{
data.Text = "call " + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xC3)
{
data.Text = "jp " + GetAddr(data.ImmediateWord, labels);
}
//dajpc,fajpm,d2jpnc,c2jpnz,f2jpp,cajz
else if (data.OpCode == 0xDA)
{
data.Text = "jp c," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xFA)
{
data.Text = "jp m," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xD2)
{
data.Text = "jp nc," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xC2)
{
data.Text = "jp nz," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xF2)
{
data.Text = "jp p," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xCA)
{
data.Text = "jp z, " + GetAddr(data.ImmediateWord, labels);
}
//rel jumps
else if (data.OpCode == 0x38)
{
data.Text = "jr c, " + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0x30)
{
data.Text = "jr nc, " + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0x20)
{
data.Text = "jr nz, " + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0x28)
{
data.Text = "jr z, " + GetAddr(data.ImmediateWord, labels);
}
//op nn instructions (ld bc,0000h)
else if (data.OpCode == 0x32)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),a";
}
else if (data.OpCode == 0xed43)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),bc";
}
else if (data.OpCode == 0xed53)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),de";
}
else if (data.OpCode == 0x22)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),hl";
}
else if (data.OpCode == 0xdd22)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),ix";
}
else if (data.OpCode == 0xfd22)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),iy";
}
else if (data.OpCode == 0xed73)
{
data.Text = "ld (" + GetAddr(data.ImmediateWord, labels) + "),sp";
}
else if (data.OpCode == 0x3a)
{
data.Text = "ld a,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0xed4b)
{
data.Text = "ld bc,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0x01)
{
data.Text = "ld bc," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xed5b)
{
data.Text = "ld de,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0x11)
{
data.Text = "ld de," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0x2a)
{
data.Text = "ld hl,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0x21)
{
data.Text = "ld hl," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xdd2a)
{
data.Text = "ld ix,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0xdd21)
{
data.Text = "ld ix," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xfd2a)
{
data.Text = "ld iy,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0xfd21)
{
data.Text = "ld iy," + GetAddr(data.ImmediateWord, labels);
}
else if (data.OpCode == 0xed7b)
{
data.Text = "ld sp,(" + GetAddr(data.ImmediateWord, labels) + ")";
}
else if (data.OpCode == 0x31)
{
data.Text = "ld sp," + GetAddr(data.ImmediateWord, labels);
}
//2 byte opcode, 1 byte immediate
//ld r, (ix+d)
else if (data.OpCode == 0xDD7E && (data.ImmediateByte1 & 0x46) == 0x46)
{//ld r, (ix+d)
string r = GetRegister((byte)(data.OpCode % 256));
data.Text = string.Format(
"ld {0},(ix+{1})",
r,
data.ImmediateByte1
);
}
//ld r, (iy+d)
else if (data.OpCode == 0xFFDE && (data.ImmediateByte1 & 0x46) == 0x46)
{
string r = GetRegister((byte)(data.OpCode % 256));
data.Text = string.Format(
"ld {0},(iy+{1})",
r,
data.ImmediateByte1
);
}
//two immediate bytes ( res, bit, set, ld (ix+n),n )
else if (data.OpCode == 0xDDCB) //res 0,(ix+n) or bit 0,(ix+n), or set 0,(ix+n)
{
int hi2 = GetHi2(data.ImmediateByte2);
int bit = GetBit(data.ImmediateByte1);
string op = "";
if (hi2 == 1)
{
op = "bit";
}
else if (hi2 == 2)
{
op = "res";
}
else if (hi2 == 3)
{
op = "set";
}
data.Text = String.Format("{0} {1},(ix+{2})",
op,
bit,
data.ImmediateByte1
);
}
else if (data.OpCode == 0xFDCB)
{
int hi2 = GetHi2(data.ImmediateByte2);
int bit = GetBit(data.ImmediateByte1);
string op = "";
if (hi2 == 1)
{
op = "bit";
}
else if (hi2 == 2)
{
op = "res";
}
else if (hi2 == 3)
{
op = "set";
}
data.Text = String.Format("{0} {1},(iy+{2})",
op,
bit,
data.ImmediateByte1
);
}
else if (data.OpCode == 0xdd36)
{//ld (ix+d),n
data.Text = String.Format("ld (ix+{0}),{1}",
data.ImmediateByte1,
data.ImmediateByte2
);
}
else if (data.OpCode == 0xdd36)
{//ld (ix+d),n
data.Text = String.Format("ld (ix+{0}),{1}",
data.ImmediateByte1,
data.ImmediateByte2
);
}
else if (data.OpCode == 0xfd36)
{//ld (iy+d),n
data.Text = String.Format("ld (iy+{0}),{1}",
data.ImmediateByte1,
data.ImmediateByte2
);
}
else
{
data.Text = "0x??";
return(false);
}
return(true);
//immediates, not same size ld ?
}