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BizHawk/BizHawk.Emulation/CPUs/68000/Instructions/DataMovement.cs

599 lines
21 KiB
C#
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using System;
using System.Text;
namespace BizHawk.Emulation.CPUs.M68000
{
partial class MC68000
{
void MOVE()
{
int size = ((op >> 12) & 0x03);
int dstMode = ((op >> 6) & 0x07);
int dstReg = ((op >> 9) & 0x07);
int srcMode = ((op >> 3) & 0x07);
int srcReg = (op & 0x07);
int value = 0;
switch (size)
{
case 1: // Byte
value = ReadValueB(srcMode, srcReg);
WriteValueB(dstMode, dstReg, (sbyte) value);
PendingCycles -= MoveCyclesBW[srcMode + (srcMode == 7 ? srcReg : 0), dstMode + (dstMode == 7 ? dstReg : 0)];
N = (value & 0x80) != 0;
break;
case 3: // Word
value = ReadValueW(srcMode, srcReg);
WriteValueW(dstMode, dstReg, (short)value);
PendingCycles -= MoveCyclesBW[srcMode + (srcMode == 7 ? srcReg : 0), dstMode + (dstMode == 7 ? dstReg : 0)];
N = (value & 0x8000) != 0;
break;
case 2: // Long
value = ReadValueL(srcMode, srcReg);
WriteValueL(dstMode, dstReg, value);
PendingCycles -= MoveCyclesL[srcMode + (srcMode == 7 ? srcReg : 0), dstMode + (dstMode == 7 ? dstReg : 0)];
N = (value & 0x80000000) != 0;
break;
}
V = false;
C = false;
Z = (value == 0);
}
void MOVE_Disasm(DisassemblyInfo info)
{
int size = ((op >> 12) & 0x03);
int dstMode = ((op >> 6) & 0x07);
int dstReg = ((op >> 9) & 0x07);
int srcMode = ((op >> 3) & 0x07);
int srcReg = (op & 0x07);
int pc = info.PC + 2;
switch (size)
{
case 1:
info.Mnemonic = "move.b";
info.Args = DisassembleValue(srcMode, srcReg, 1, ref pc) +", ";
info.Args += DisassembleValue(dstMode, dstReg, 1, ref pc);
break;
case 3:
info.Mnemonic = "move.w";
info.Args = DisassembleValue(srcMode, srcReg, 2, ref pc) + ", ";
info.Args += DisassembleValue(dstMode, dstReg, 2, ref pc);
break;
case 2:
info.Mnemonic = "move.l";
info.Args = DisassembleValue(srcMode, srcReg, 4, ref pc) + ", ";
info.Args += DisassembleValue(dstMode, dstReg, 4, ref pc);
break;
}
info.Length = pc - info.PC;
}
void MOVEA()
{
int size = ((op >> 12) & 0x03);
int dstReg = ((op >> 9) & 0x07);
int srcMode = ((op >> 3) & 0x07);
int srcReg = (op & 0x07);
if (size == 3) // Word
{
A[dstReg].s32 = ReadValueW(srcMode, srcReg);
switch (srcMode)
{
case 0: PendingCycles -= 4; break;
case 1: PendingCycles -= 4; break;
case 2: PendingCycles -= 8; break;
case 3: PendingCycles -= 8; break;
case 4: PendingCycles -= 10; break;
case 5: PendingCycles -= 12; break;
case 6: PendingCycles -= 14; break;
case 7:
switch (srcReg)
{
case 0: PendingCycles -= 12; break;
case 1: PendingCycles -= 16; break;
case 2: PendingCycles -= 12; break;
case 3: PendingCycles -= 14; break;
case 4: PendingCycles -= 8; break;
default: throw new InvalidOperationException();
}
break;
}
} else { // Long
A[dstReg].s32 = ReadValueL(srcMode, srcReg);
switch (srcMode)
{
case 0: PendingCycles -= 4; break;
case 1: PendingCycles -= 4; break;
case 2: PendingCycles -= 12; break;
case 3: PendingCycles -= 12; break;
case 4: PendingCycles -= 14; break;
case 5: PendingCycles -= 16; break;
case 6: PendingCycles -= 18; break;
case 7:
switch (srcReg)
{
case 0: PendingCycles -= 16; break;
case 1: PendingCycles -= 20; break;
case 2: PendingCycles -= 16; break;
case 3: PendingCycles -= 18; break;
case 4: PendingCycles -= 12; break;
default: throw new InvalidOperationException();
}
break;
}
}
}
void MOVEA_Disasm(DisassemblyInfo info)
{
int size = ((op >> 12) & 0x03);
int dstReg = ((op >> 9) & 0x07);
int srcMode = ((op >> 3) & 0x07);
int srcReg = (op & 0x07);
int pc = info.PC + 2;
if (size == 3)
{
info.Mnemonic = "movea.w";
info.Args = DisassembleValue(srcMode, srcReg, 2, ref pc) + ", A" + dstReg;
} else {
info.Mnemonic = "movea.l";
info.Args = DisassembleValue(srcMode, srcReg, 4, ref pc) + ", A" + dstReg;
}
info.Length = pc - info.PC;
}
void MOVEQ()
{
int value = (sbyte) op; // 8-bit data payload is sign-extended to 32-bits.
N = (value & 0x80) != 0;
Z = (value == 0);
V = false;
C = false;
D[(op >> 9) & 7].s32 = value;
PendingCycles -= 4;
}
void MOVEQ_Disasm(DisassemblyInfo info)
{
info.Mnemonic = "moveq";
info.Args = String.Format("{0}, D{1}", (sbyte) op, (op >> 9) & 7);
}
void MOVEM0()
{
// Move register to memory
int size = (op >> 6) & 1;
int dstMode = (op >> 3) & 7;
int dstReg = (op >> 0) & 7;
ushort registers = (ushort) ReadWord(PC); PC += 2;
int address = ReadAddress(dstMode, dstReg);
int regCount = 0;
if (size == 0)
{
// word-assign
if (dstMode == 4) // decrement address
{
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
address -= 2;
WriteWord(address, A[i].s16);
regCount++;
}
registers >>= 1;
}
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
address -= 2;
WriteWord(address, D[i].s16);
regCount++;
}
registers >>= 1;
}
A[dstReg].s32 = address;
}
else
{ // increment address
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
WriteWord(address, A[i].s16);
address += 2;
regCount++;
}
registers >>= 1;
}
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
WriteWord(address, D[i].s16);
address += 2;
regCount++;
}
registers >>= 1;
}
}
PendingCycles -= regCount*4;
} else {
// long-assign
if (dstMode == 4) // decrement address
{
for (int i=7; i>= 0; i--)
{
if ((registers & 1) == 1)
{
address -= 4;
WriteLong(address, A[i].s32);
regCount++;
}
registers >>= 1;
}
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
address -= 4;
WriteLong(address, D[i].s32);
regCount++;
}
registers >>= 1;
}
A[dstReg].s32 = address;
} else { // increment address
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
WriteLong(address, A[i].s32);
address += 4;
regCount++;
}
registers >>= 1;
}
for (int i = 7; i >= 0; i--)
{
if ((registers & 1) == 1)
{
WriteLong(address, D[i].s32);
address += 4;
regCount++;
}
registers >>= 1;
}
}
PendingCycles -= regCount * 8;
}
switch (dstMode)
{
case 2: PendingCycles -= 8; break;
case 3: PendingCycles -= 8; break;
case 4: PendingCycles -= 8; break;
case 5: PendingCycles -= 12; break;
case 6: PendingCycles -= 14; break;
case 7:
switch (dstReg)
{
case 0: PendingCycles -= 12; break;
case 1: PendingCycles -= 16; break;
}
break;
}
}
void MOVEM1()
{
// Move memory to register
int size = (op >> 6) & 1;
int srcMode = (op >> 3) & 7;
int srcReg = (op >> 0) & 7;
ushort registers = (ushort)ReadWord(PC); PC += 2;
int address = ReadAddress(srcMode, srcReg);
int regCount = 0;
if (size == 0)
{
// word-assign
for (int i = 0; i < 8; i++)
{
if ((registers & 1) == 1)
{
D[i].s32 = ReadWord(address);
address += 2;
regCount++;
}
registers >>= 1;
}
for (int i = 0; i < 8; i++)
{
if ((registers & 1) == 1)
{
A[i].s32 = ReadWord(address);
address += 2;
regCount++;
}
registers >>= 1;
}
PendingCycles -= regCount * 4;
if (srcMode == 3)
A[srcReg].s32 = address;
} else {
// long-assign
for (int i = 0; i < 8; i++)
{
if ((registers & 1) == 1)
{
D[i].s32 = ReadLong(address);
address += 4;
regCount++;
}
registers >>= 1;
}
for (int i = 0; i < 8; i++)
{
if ((registers & 1) == 1)
{
A[i].s32 = ReadLong(address);
address += 4;
regCount++;
}
registers >>= 1;
}
PendingCycles -= regCount * 8;
if (srcMode == 3)
A[srcReg].s32 = address;
}
switch (srcMode)
{
case 2: PendingCycles -= 12; break;
case 3: PendingCycles -= 12; break;
case 4: PendingCycles -= 12; break;
case 5: PendingCycles -= 16; break;
case 6: PendingCycles -= 18; break;
case 7:
switch (srcReg)
{
case 0: PendingCycles -= 16; break;
case 1: PendingCycles -= 20; break;
case 2: PendingCycles -= 16; break;
case 3: PendingCycles -= 18; break;
}
break;
}
}
static string DisassembleRegisterList0(ushort registers)
{
var str = new StringBuilder();
int count = 0;
for (int i = 0; i<8; i++)
{
if ((registers & 0x8000) != 0)
{
if (count > 0) str.Append(",");
str.Append("D"+i);
count++;
}
registers <<= 1;
}
for (int i = 0; i < 8; i++)
{
if ((registers & 0x8000) != 0)
{
if (count > 0) str.Append(",");
str.Append("A"+i);
count++;
}
registers <<= 1;
}
return str.ToString();
}
static string DisassembleRegisterList1(ushort registers)
{
var str = new StringBuilder();
int count = 0;
for (int i = 0; i < 8; i++)
{
if ((registers & 1) != 0)
{
if (count > 0) str.Append(",");
str.Append("D" + i);
count++;
}
registers >>= 1;
}
for (int i = 0; i < 8; i++)
{
if ((registers & 1) != 0)
{
if (count > 0) str.Append(",");
str.Append("A" + i);
count++;
}
registers >>= 1;
}
return str.ToString();
}
void MOVEM0_Disasm(DisassemblyInfo info)
{
int size = (op >> 6) & 1;
int mode = (op >> 3) & 7;
int reg = (op >> 0) & 7;
int pc = info.PC + 2;
ushort registers = (ushort)ReadWord(pc); pc += 2;
string address = DisassembleAddress(mode, reg, ref pc);
info.Mnemonic = size == 0 ? "movem.w" : "movem.l";
info.Args = DisassembleRegisterList0(registers) + ", " + address;
info.Length = pc - info.PC;
}
void MOVEM1_Disasm(DisassemblyInfo info)
{
int size = (op >> 6) & 1;
int mode = (op >> 3) & 7;
int reg = (op >> 0) & 7;
int pc = info.PC + 2;
ushort registers = (ushort)ReadWord(pc); pc += 2;
string address = DisassembleAddress(mode, reg, ref pc);
info.Mnemonic = size == 0 ? "movem.w" : "movem.l";
info.Args = address + ", " + DisassembleRegisterList1(registers);
info.Length = pc - info.PC;
}
void LEA()
{
int mode = (op >> 3) & 7;
int sReg = (op >> 0) & 7;
int dReg = (op >> 9) & 7;
A[dReg].u32 = (uint)ReadAddress(mode, sReg);
switch (mode)
{
case 2: PendingCycles -= 4; break;
case 5: PendingCycles -= 8; break;
case 6: PendingCycles -= 12; break;
case 7:
switch (sReg)
{
case 0: PendingCycles -= 8; break;
case 1: PendingCycles -= 12; break;
case 2: PendingCycles -= 8; break;
case 3: PendingCycles -= 12; break;
}
break;
}
}
void LEA_Disasm(DisassemblyInfo info)
{
int pc = info.PC + 2;
int mode = (op >> 3) & 7;
int sReg = (op >> 0) & 7;
int dReg = (op >> 9) & 7;
info.Mnemonic = "lea";
info.Args = DisassembleAddress(mode, sReg, ref pc);
info.Args += ", A"+dReg;
info.Length = pc - info.PC;
}
void CLR()
{
int size = (op >> 6) & 3;
int mode = (op >> 3) & 7;
int reg = (op >> 0) & 7;
switch (size)
{
case 0: WriteValueB(mode, reg, 0); PendingCycles -= mode == 0 ? 4 : 8 + EACyclesBW[mode, reg]; break;
case 1: WriteValueW(mode, reg, 0); PendingCycles -= mode == 0 ? 4 : 8 + EACyclesBW[mode, reg]; break;
case 2: WriteValueL(mode, reg, 0); PendingCycles -= mode == 0 ? 6 : 12 + EACyclesL[mode, reg]; break;
}
N = V = C = false;
Z = true;
}
void CLR_Disasm(DisassemblyInfo info)
{
int pc = info.PC + 2;
int size = (op >> 6) & 3;
int mode = (op >> 3) & 7;
int reg = (op >> 0) & 7;
switch (size)
{
case 0: info.Mnemonic = "clr.b"; info.Args = DisassembleValue(mode, reg, 1, ref pc); break;
case 1: info.Mnemonic = "clr.w"; info.Args = DisassembleValue(mode, reg, 2, ref pc); break;
case 2: info.Mnemonic = "clr.l"; info.Args = DisassembleValue(mode, reg, 4, ref pc); break;
}
info.Length = pc - info.PC;
}
void EXT()
{
int size = (op >> 6) & 1;
int reg = op & 7;
switch (size)
{
case 0: D[reg].s16 = D[reg].s8; break;
case 1: D[reg].s32 = D[reg].s16; break;
}
PendingCycles -= 4;
}
void EXT_Disasm(DisassemblyInfo info)
{
int pc = info.PC;
int size = (op >> 6) & 1;
int reg = op & 7;
switch (size)
{
case 0: info.Mnemonic = "ext.w"; info.Args = "D" + reg; break;
case 1: info.Mnemonic = "ext.l"; info.Args = "D" + reg; break;
}
}
void PEA()
{
int mode = (op >> 3) & 7;
int reg = (op >> 0) & 7;
int ea = ReadAddress(mode, reg);
A[7].s32 -= 4;
WriteLong(A[7].s32, ea);
switch (mode)
{
case 2: PendingCycles -= 12; break;
case 5: PendingCycles -= 16; break;
case 6: PendingCycles -= 20; break;
case 7:
switch (reg)
{
case 0: PendingCycles -= 16; break;
case 1: PendingCycles -= 20; break;
case 2: PendingCycles -= 16; break;
case 3: PendingCycles -= 20; break;
}
break;
}
}
void PEA_Disasm(DisassemblyInfo info)
{
int pc = info.PC + 2;
int mode = (op >> 3) & 7;
int reg = (op >> 0) & 7;
info.Mnemonic = "pea";
info.Args = DisassembleAddress(mode, reg, ref pc);
info.Length = pc - info.PC;
}
}
}
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