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BizHawk/BizHawk.Emulation.Cores/CPUs/Z80A/Z80A.cs

689 lines
19 KiB
C#
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using System;
using System.Globalization;
using System.IO;
using BizHawk.Common;
using BizHawk.Emulation.Common;
using BizHawk.Common.NumberExtensions;
// Z80A CPU
namespace BizHawk.Emulation.Cores.Components.Z80A
{
public sealed partial class Z80A
{
// operations that can take place in an instruction
public const ushort IDLE = 0;
public const ushort OP = 1;
public const ushort OP_R = 2; // used for repeating operations
public const ushort HALT = 3;
public const ushort RD = 4;
public const ushort WR = 5;
public const ushort I_RD = 6;
public const ushort I_WR = 7;
public const ushort TR = 8;
public const ushort TR16 = 9;
public const ushort ADD16 = 10;
public const ushort ADD8 = 11;
public const ushort SUB8 = 12;
public const ushort ADC8 = 13;
public const ushort SBC8 = 14;
public const ushort SBC16 = 15;
public const ushort ADC16 = 16;
public const ushort INC16 = 17;
public const ushort INC8 = 18;
public const ushort DEC16 = 19;
public const ushort DEC8 = 20;
public const ushort RLC = 21;
public const ushort RL = 22;
public const ushort RRC = 23;
public const ushort RR = 24;
public const ushort CPL = 25;
public const ushort DA = 26;
public const ushort SCF = 27;
public const ushort CCF = 28;
public const ushort AND8 = 29;
public const ushort XOR8 = 30;
public const ushort OR8 = 31;
public const ushort CP8 = 32;
public const ushort SLA = 33;
public const ushort SRA = 34;
public const ushort SRL = 35;
public const ushort SLL = 36;
public const ushort BIT = 37;
public const ushort RES = 38;
public const ushort SET = 39;
public const ushort EI = 40;
public const ushort DI = 41;
public const ushort EXCH = 42;
public const ushort EXX = 43;
public const ushort EXCH_16 = 44;
public const ushort PREFIX = 45;
public const ushort PREFETCH = 46;
public const ushort ASGN = 47;
public const ushort ADDS = 48; // signed 16 bit operation used in 2 instructions
public const ushort INT_MODE = 49;
public const ushort EI_RETN = 50;
public const ushort EI_RETI = 51; // reti has no delay in interrupt enable
public const ushort OUT = 52;
public const ushort IN = 53;
public const ushort NEG = 54;
public const ushort RRD = 55;
public const ushort RLD = 56;
public const ushort SET_FL_LD = 57;
public const ushort SET_FL_CP = 58;
public const ushort SET_FL_IR = 59;
public const ushort I_BIT = 60;
public const ushort HL_BIT = 61;
public byte temp_R;
public Z80A()
{
Reset();
InitTableParity();
}
public void Reset()
{
ResetRegisters();
ResetInterrupts();
TotalExecutedCycles = 0;
cur_instr = new ushort[] { OP };
instr_pntr = 0;
NO_prefix = true;
}
public IMemoryCallbackSystem MemoryCallbacks { get; set; }
// Memory Access
public Func<ushort, byte> FetchMemory;
public Func<ushort, byte> ReadMemory;
public Action<ushort, byte> WriteMemory;
public Func<ushort, byte> PeekMemory;
public Func<ushort, byte> DummyReadMemory;
// Hardware I/O Port Access
public Func<ushort, byte> ReadHardware;
public Action<ushort, byte> WriteHardware;
//this only calls when the first byte of an instruction is fetched.
public Action<ushort> OnExecFetch;
public void UnregisterMemoryMapper()
{
ReadMemory = null;
WriteMemory = null;
PeekMemory = null;
DummyReadMemory = null;
ReadHardware = null;
WriteHardware = null;
}
public void SetCallbacks
(
Func<ushort, byte> ReadMemory,
Func<ushort, byte> DummyReadMemory,
Func<ushort, byte> PeekMemory,
Action<ushort, byte> WriteMemory,
Func<ushort, byte> ReadHardware,
Action<ushort, byte> WriteHardware
)
{
this.ReadMemory = ReadMemory;
this.DummyReadMemory = DummyReadMemory;
this.PeekMemory = PeekMemory;
this.WriteMemory = WriteMemory;
this.ReadHardware = ReadHardware;
this.WriteHardware = WriteHardware;
}
// Execute instructions
public void ExecuteOne()
{
if (Regs[A] > 255) { Console.WriteLine(RegPC); }
switch (cur_instr[instr_pntr++])
{
case IDLE:
// do nothing
break;
case OP:
// Read the opcode of the next instruction
if (EI_pending > 0)
{
EI_pending--;
if (EI_pending == 0) { IFF1 = IFF2 = true; }
}
// Process interrupt requests.
if (nonMaskableInterruptPending)
{
nonMaskableInterruptPending = false;
if (TraceCallback != null)
{
TraceCallback(new TraceInfo{Disassembly = "====NMI====", RegisterInfo = ""});
}
iff2 = iff1;
iff1 = false;
NMI_();
NMICallback();
}
else if (iff1 && FlagI)
{
iff1 = iff2 = false;
EI_pending = 0;
if (TraceCallback != null)
{
TraceCallback(new TraceInfo{Disassembly = "====IRQ====", RegisterInfo = ""});
}
switch (interruptMode)
{
case 0:
// Requires something to be pushed onto the data bus
// we'll assume it's a zero for now
INTERRUPT_0(0);
break;
case 1:
INTERRUPT_1();
break;
case 2:
// Low byte of interrupt vector comes from data bus
// We'll assume it's zero for now
INTERRUPT_2(0);
break;
}
IRQCallback();
}
else
{
if (OnExecFetch != null) OnExecFetch(RegPC);
if (TraceCallback != null) TraceCallback(State());
FetchInstruction(FetchMemory(RegPC++));
}
instr_pntr = 0;
temp_R = (byte)(Regs[R] & 0x7F);
temp_R++;
temp_R &= 0x7F;
Regs[R] = (byte)((Regs[R] & 0x80) | temp_R);
break;
case OP_R:
// determine if we repeat based on what operation we are doing
// single execution versions also come here, but never repeat
ushort temp1 = cur_instr[instr_pntr++];
ushort temp2 = cur_instr[instr_pntr++];
ushort temp3 = cur_instr[instr_pntr++];
bool repeat = false;
int Reg16_d = Regs[C] | (Regs[B] << 8);
switch (temp1)
{
case 0:
repeat = Reg16_d != 0;
break;
case 1:
repeat = (Reg16_d != 0) && !FlagZ;
break;
case 2:
repeat = Regs[B] != 0;
break;
case 3:
repeat = Regs[B] != 0;
break;
}
// if we repeat, we do a 5 cycle refresh which decrements PC by 2
// if we don't repeat, continue on as a normal opcode fetch
if (repeat && temp3 > 0)
{
cur_instr = new ushort[]
{IDLE,
DEC16, PCl, PCh,
IDLE,
DEC16, PCl, PCh,
OP };
// adjust WZ register accordingly
switch (temp1)
{
case 0:
// TEST: PC before or after the instruction?
Regs[Z] = Regs[PCl];
Regs[W] = Regs[PCh];
INC16_Func(Z, W);
break;
case 1:
// TEST: PC before or after the instruction?
Regs[Z] = Regs[PCl];
Regs[W] = Regs[PCh];
INC16_Func(Z, W);
break;
case 2:
// Nothing
break;
case 3:
// Nothing
break;
}
}
else
{
// Interrupts can occur at this point, so process them accordingly
// Read the opcode of the next instruction
if (EI_pending > 0)
{
EI_pending--;
if (EI_pending == 0) { IFF1 = IFF2 = true; }
}
// Process interrupt requests.
if (nonMaskableInterruptPending)
{
nonMaskableInterruptPending = false;
if (TraceCallback != null)
{
TraceCallback(new TraceInfo{Disassembly = "====NMI====", RegisterInfo = ""});
}
iff2 = iff1;
iff1 = false;
NMI_();
NMICallback();
}
else if (iff1 && FlagI)
{
iff1 = iff2 = false;
EI_pending = 0;
if (TraceCallback != null)
{
TraceCallback(new TraceInfo{Disassembly = "====IRQ====", RegisterInfo = ""});
}
switch (interruptMode)
{
case 0:
// Requires something to be pushed onto the data bus
// we'll assume it's a zero for now
INTERRUPT_0(0);
break;
case 1:
INTERRUPT_1();
break;
case 2:
// Low byte of interrupt vector comes from data bus
// We'll assume it's zero for now
INTERRUPT_2(0);
break;
}
IRQCallback();
}
else
{
if (OnExecFetch != null) OnExecFetch(RegPC);
if (TraceCallback != null) TraceCallback(State());
FetchInstruction(FetchMemory(RegPC++));
}
temp_R = (byte)(Regs[R] & 0x7F);
temp_R++;
temp_R &= 0x7F;
Regs[R] = (byte)((Regs[R] & 0x80) | temp_R);
}
instr_pntr = 0;
break;
case HALT:
halted = true;
if (EI_pending > 0)
{
EI_pending--;
if (EI_pending == 0) { IFF1 = IFF2 = true; }
}
// Process interrupt requests.
if (nonMaskableInterruptPending)
{
nonMaskableInterruptPending = false;
if (TraceCallback != null)
{
TraceCallback(new TraceInfo{Disassembly = "====NMI====", RegisterInfo = ""});
}
iff2 = iff1;
iff1 = false;
NMI_();
NMICallback();
halted = false;
}
else if (iff1 && FlagI)
{
iff1 = iff2 = false;
EI_pending = 0;
if (TraceCallback != null)
{
TraceCallback(new TraceInfo{Disassembly = "====IRQ====", RegisterInfo = ""});
}
switch (interruptMode)
{
case 0:
// Requires something to be pushed onto the data bus
// we'll assume it's a zero for now
INTERRUPT_0(0);
break;
case 1:
INTERRUPT_1();
break;
case 2:
// Low byte of interrupt vector comes from data bus
// We'll assume it's zero for now
INTERRUPT_2(0);
break;
}
IRQCallback();
halted = false;
}
else
{
cur_instr = new ushort[]
{IDLE,
IDLE,
IDLE,
HALT };
}
temp_R = (byte)(Regs[R] & 0x7F);
temp_R++;
temp_R &= 0x7F;
Regs[R] = (byte)((Regs[R] & 0x80) | temp_R);
instr_pntr = 0;
break;
case RD:
Read_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case WR:
Write_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case I_RD:
I_Read_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case I_WR:
I_Write_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case TR:
TR_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case TR16:
TR16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case ADD16:
ADD16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case ADD8:
ADD8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case SUB8:
SUB8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case ADC8:
ADC8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case ADC16:
ADC_16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case SBC8:
SBC8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case SBC16:
SBC_16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case INC16:
INC16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case INC8:
INC8_Func(cur_instr[instr_pntr++]);
break;
case DEC16:
DEC16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case DEC8:
DEC8_Func(cur_instr[instr_pntr++]);
break;
case RLC:
RLC_Func(cur_instr[instr_pntr++]);
break;
case RL:
RL_Func(cur_instr[instr_pntr++]);
break;
case RRC:
RRC_Func(cur_instr[instr_pntr++]);
break;
case RR:
RR_Func(cur_instr[instr_pntr++]);
break;
case CPL:
CPL_Func(cur_instr[instr_pntr++]);
break;
case DA:
DA_Func(cur_instr[instr_pntr++]);
break;
case SCF:
SCF_Func(cur_instr[instr_pntr++]);
break;
case CCF:
CCF_Func(cur_instr[instr_pntr++]);
break;
case AND8:
AND8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case XOR8:
XOR8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case OR8:
OR8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case CP8:
CP8_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case SLA:
SLA_Func(cur_instr[instr_pntr++]);
break;
case SRA:
SRA_Func(cur_instr[instr_pntr++]);
break;
case SRL:
SRL_Func(cur_instr[instr_pntr++]);
break;
case SLL:
SLL_Func(cur_instr[instr_pntr++]);
break;
case BIT:
BIT_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case I_BIT:
I_BIT_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case RES:
RES_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case SET:
SET_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case EI:
EI_pending = 2;
break;
case DI:
IFF1 = IFF2 = false;
break;
case EXCH:
EXCH_16_Func(F_s, A_s, F, A);
break;
case EXX:
EXCH_16_Func(C_s, B_s, C, B);
EXCH_16_Func(E_s, D_s, E, D);
EXCH_16_Func(L_s, H_s, L, H);
break;
case EXCH_16:
EXCH_16_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case PREFIX:
ushort prefix_src = cur_instr[instr_pntr++];
NO_prefix = false;
if (prefix_src == CBpre) { CB_prefix = true; }
if (prefix_src == EXTDpre) { EXTD_prefix = true; }
if (prefix_src == IXpre) { IX_prefix = true; }
if (prefix_src == IYpre) { IY_prefix = true; }
if (prefix_src == IXCBpre) { IXCB_prefix = true; IXCB_prefetch = true; }
if (prefix_src == IYCBpre) { IYCB_prefix = true; IYCB_prefetch = true; }
FetchInstruction(FetchMemory(RegPC++));
instr_pntr = 0;
// only the first prefix in a double prefix increases R, although I don't know how / why
if (prefix_src < 4)
{
temp_R = (byte)(Regs[R] & 0x7F);
temp_R++;
temp_R &= 0x7F;
Regs[R] = (byte)((Regs[R] & 0x80) | temp_R);
}
break;
case ASGN:
ASGN_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case ADDS:
ADDS_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case EI_RETI:
// NOTE: This is needed for systems using multiple interrupt sources, it triggers the next interrupt
// Not currently implemented here
iff1 = iff2;
break;
case EI_RETN:
iff1 = iff2;
break;
case OUT:
OUT_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case IN:
IN_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case NEG:
NEG_8_Func(cur_instr[instr_pntr++]);
break;
case INT_MODE:
interruptMode = cur_instr[instr_pntr++];
break;
case RRD:
RRD_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case RLD:
RLD_Func(cur_instr[instr_pntr++], cur_instr[instr_pntr++]);
break;
case SET_FL_LD:
SET_FL_LD_Func();
break;
case SET_FL_CP:
SET_FL_CP_Func();
break;
case SET_FL_IR:
SET_FL_IR_Func(cur_instr[instr_pntr++]);
break;
}
totalExecutedCycles++;
}
// tracer stuff
public Action<TraceInfo> TraceCallback;
public string TraceHeader
{
get { return "Z80A: PC, machine code, mnemonic, operands, registers (AF, BC, DE, HL, IX, IY, SP, Cy), flags (CNP3H5ZS)"; }
}
public TraceInfo State(bool disassemble = true)
{
int bytes_read = 0;
string disasm = disassemble ? Disassemble(RegPC, ReadMemory, out bytes_read) : "---";
string byte_code = null;
for (ushort i = 0; i < bytes_read; i++)
{
byte_code += ReadMemory((ushort)(RegPC + i)).ToHexString(2);
if (i < (bytes_read - 1))
{
byte_code += " ";
}
}
return new TraceInfo
{
Disassembly = string.Format(
"{0:X4}: {1} {2}",
RegPC,
byte_code.PadRight(12),
disasm.PadRight(26)),
RegisterInfo = string.Format(
"AF:{0:X4} BC:{1:X4} DE:{2:X4} HL:{3:X4} IX:{4:X4} IY:{5:X4} SP:{6:X4} Cy:{7} {8}{9}{10}{11}{12}{13}{14}{15}{16}",
(Regs[A] << 8) + Regs[F],
(Regs[B] << 8) + Regs[C],
(Regs[D] << 8) + Regs[E],
(Regs[H] << 8) + Regs[L],
(Regs[Ixh] << 8) + Regs[Ixl],
(Regs[Iyh] << 8) + Regs[Iyl],
Regs[SPl] | (Regs[SPh] << 8),
TotalExecutedCycles,
FlagC ? "C" : "c",
FlagN ? "N" : "n",
FlagP ? "P" : "p",
Flag3 ? "3" : "-",
FlagH ? "H" : "h",
Flag5 ? "5" : "-",
FlagZ ? "Z" : "z",
FlagS ? "S" : "s",
FlagI ? "E" : "e")
};
}
// State Save/Load
public void SyncState(Serializer ser)
{
ser.BeginSection("Z80A");
ser.Sync("Regs", ref Regs, false);
ser.Sync("NMI", ref nonMaskableInterrupt);
ser.Sync("NMIPending", ref nonMaskableInterruptPending);
ser.Sync("IM", ref interruptMode);
ser.Sync("IFF1", ref iff1);
ser.Sync("IFF2", ref iff2);
ser.Sync("Halted", ref halted);
ser.Sync("ExecutedCycles", ref totalExecutedCycles);
ser.Sync("EI_pending", ref EI_pending);
ser.Sync("instruction_pointer", ref instr_pntr);
ser.Sync("current instruction", ref cur_instr, false);
ser.Sync("opcode", ref opcode);
ser.Sync("FlagI", ref FlagI);
ser.Sync("NO Preifx", ref NO_prefix);
ser.Sync("CB Preifx", ref CB_prefix);
ser.Sync("IX_prefix", ref IX_prefix);
ser.Sync("IY_prefix", ref IY_prefix);
ser.Sync("IXCB_prefix", ref IXCB_prefix);
ser.Sync("IYCB_prefix", ref IYCB_prefix);
ser.Sync("EXTD_prefix", ref EXTD_prefix);
ser.Sync("IXCB_prefetch", ref IXCB_prefetch);
ser.Sync("IYCB_prefetch", ref IYCB_prefetch);
ser.Sync("PF", ref PF);
ser.EndSection();
}
}
}
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