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NativeCog.cs
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NativeCog.cs
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/* --------------------------------------------------------------------------------
* Gear: Parallax Inc. PropellerCPU Debugger
* Copyright 2007-2022 - Gear Developers
* --------------------------------------------------------------------------------
* NativeCog.cs
* Object class for a native assembly (machine code) cog
* --------------------------------------------------------------------------------
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* --------------------------------------------------------------------------------
*/
using Gear.Propeller;
namespace Gear.EmulationCore
{
/// @brief Derived class from Cog, to emulate running PASM code.
public partial class NativeCog : Cog
{
// Decode fields
protected uint Operation;
protected Assembly.InstructionCodes InstructionCode;
protected Assembly.ConditionCodes ConditionCode;
protected bool WriteZero;
protected bool WriteCarry;
protected bool WriteResult;
protected bool ImmediateValue;
protected uint SourceValue;
protected uint Destination;
protected uint DestinationValue;
// Encode fields
protected uint DataResult;
protected bool CarryResult;
protected bool ZeroResult;
protected bool Carry; //!< Carry Flag
protected bool Zero; //!< Zero Flag
public bool CarryFlag
{
get { return Carry; }
set { Carry = value; }
}
public bool ZeroFlag
{
get { return Zero; }
set { Zero = value; }
}
/// @brief Default constructor for a %Cog running in PASM mode.
/// @param cpuHost PropellerCPU where this cog resides.
/// @param cogNum
/// @param programAddress Start of program to load from main memory.
/// @param paramAddress PARAM value given to the Cog.
/// @param frequency Frequency running the cog (the same as the propeller cpu).
/// @param pllGroup PLL Multiplier running the cog (the same as the propeller cpu).
/// @version v22.05.03 - Parameter name changed to use the same
/// convention for a PropellerCPU instance reference.
public NativeCog(PropellerCPU cpuHost, int cogNum, uint programAddress,
uint paramAddress, uint frequency, PLLGroup pllGroup)
: base(cpuHost, cogNum, programAddress, paramAddress, frequency, pllGroup)
{
Carry = false;
Zero = false;
}
/// @brief Determine what effect will be executed after this operation.
/// @details The possibles are Write Result, Zero flag or Carry flag, or mix between them.
private void WriteBackResult()
{
if (WriteResult)
WriteLong(Destination, DataResult);
if (WriteZero)
Zero = ZeroResult;
if (WriteCarry)
Carry = CarryResult;
State = CogRunState.StateExecute;
}
/// @brief Setup the cog to a initial state after boot it.
public override void Boot()
{
State = CogRunState.StateExecute;
Carry = false;
Zero = false;
ProgramCursor = 0;
// Prefetch first instruction
Operation = ReadLong(0);
}
/// @brief Determine if the Hub is accessible in that moment of time, setting the state
/// accordant.
/// @version v22.05.03 - Method name changed to clarify meaning of it.
public override void ExecuteHubOperation()
{
switch (State)
{
case CogRunState.HubHubOperation:
DataResult = CpuHost.HubOp(this, SourceValue, DestinationValue, ref CarryResult,
ref ZeroResult);
WriteBackResult();
return;
case CogRunState.HubReadByte:
if (WriteResult)
DataResult = CpuHost.DirectReadByte(SourceValue);
else
CpuHost.DirectWriteByte(SourceValue, (byte)DestinationValue);
ZeroResult = (DataResult == 0); //set as state Manual v1.2
// Don't affect Carry as state Manual v1.2
WriteBackResult();
return;
case CogRunState.HubReadWord:
if (WriteResult)
DataResult = CpuHost.DirectReadWord(SourceValue);
else
CpuHost.DirectWriteWord(SourceValue, (ushort)DestinationValue);
ZeroResult = (DataResult == 0); //set as state Manual v1.2
// Don't affect Carry as state Manual v1.2
WriteBackResult();
return;
case CogRunState.HubReadLong:
if (WriteResult)
DataResult = CpuHost.DirectReadLong(SourceValue);
else
CpuHost.DirectWriteLong(SourceValue, DestinationValue);
ZeroResult = (DataResult == 0); //set as state Manual v1.2
// Don't affect Carry as state Manual v1.2
WriteBackResult();
return;
}
base.ExecuteHubOperation();
}
/// @brief Execute a PASM instruction in this cog.
/// @returns TRUE if it is the opportunity to trigger a breakpoint, or FALSE if not.
override public bool DoInstruction()
{
switch (State)
{
// Delay State
case CogRunState.WaitCycles:
if (--StateCount == 1)
WriteBackResult();
return true;
// Clocked, but not executed
case CogRunState.WaitPreWait:
if (--StateCount == 1)
State = NextState;
return true;
// Execute State
case CogRunState.StateExecute:
break;
case CogRunState.WaitPinsNotEqual:
{
uint maskedIn = (Carry ? CpuHost.INB : CpuHost.INA) & SourceValue;
if (maskedIn != DestinationValue)
{
DataResult = maskedIn;
Zero = (maskedIn == 0);
// TODO: DETERMINE CARRY
WriteBackResult();
}
return true;
}
case CogRunState.WaitPinsEqual:
{
uint maskedIn = (Carry ? CpuHost.INB : CpuHost.INA) & SourceValue;
if (maskedIn == DestinationValue)
{
DataResult = maskedIn;
Zero = (maskedIn == 0);
// TODO: DETERMINE CARRY
WriteBackResult();
return true;
}
return true;
}
case CogRunState.WaitCount:
{
long target = CpuHost.Counter;
if (DestinationValue == target)
{
target += SourceValue;
DataResult = (uint)target;
CarryResult = target > 0xFFFFFFFF;
ZeroResult = (DataResult == 0);
WriteBackResult();
return true;
}
return true;
}
case CogRunState.WaitVideo:
// Logic Changed: GetVideoData now clears VAIT_VID state
// if (Video.Ready)
// {
// Video.Feed(DestinationValue, SourceValue);
// // TODO: Determine carry, zero, and result
// WriteBackResult();
// }
return true;
// Non-execute states are ignored
default:
return true;
}
ProgramCursor = (ProgramCursor + 1) & MaskCogMemory;
FrameFlag = FrameState.FrameNone;
InstructionCode = (Assembly.InstructionCodes)(Operation & 0xFC000000);
ConditionCode = (Assembly.ConditionCodes)((Operation & 0x003C0000) >> 18);
WriteZero = (Operation & 0x02000000) != 0;
WriteCarry = (Operation & 0x01000000) != 0;
WriteResult = (Operation & 0x00800000) != 0;
ImmediateValue = (Operation & 0x00400000) != 0;
SourceValue = Operation & MaskCogMemory;
if (!ImmediateValue)
SourceValue = ReadLong(SourceValue);
Destination = (Operation >> 9) & MaskCogMemory;
DestinationValue = ReadLong(Destination);
if (ConditionCompare(ConditionCode, Zero, Carry))
{
Operation = ReadLong(ProgramCursor);
State = CogRunState.WaitPreWait;
NextState = CogRunState.StateExecute;
StateCount = 4;
return true;
}
switch (InstructionCode)
{
// RESERVED FOR FUTURE EXPANSION
case Assembly.InstructionCodes.MUL:
case Assembly.InstructionCodes.MULS:
case Assembly.InstructionCodes.ENC:
case Assembly.InstructionCodes.ONES:
// TODO: RAISE INVALID OP CODE HERE
DataResult = 0;
Carry = true;
Zero = true;
State = CogRunState.WaitCycles;
StateCount = 4;
break;
// HUB Operations (6 cycles for instruction decode... 1-15 cycles for operation)
case Assembly.InstructionCodes.RWBYTE:
State = CogRunState.WaitPreWait;
NextState = CogRunState.HubReadByte;
StateCount = 6;
break;
case Assembly.InstructionCodes.RWWORD:
State = CogRunState.WaitPreWait;
NextState = CogRunState.HubReadWord;
StateCount = 6;
break;
case Assembly.InstructionCodes.RWLONG:
State = CogRunState.WaitPreWait;
NextState = CogRunState.HubReadLong;
StateCount = 6;
break;
case Assembly.InstructionCodes.HUBOP:
State = CogRunState.WaitPreWait;
NextState = CogRunState.HubHubOperation;
StateCount = 6;
break;
// Standard operations (4 cycles)
case Assembly.InstructionCodes.ROR:
InstructionROR();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ROL:
InstructionROL();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.RCR:
InstructionRCR();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.RCL:
InstructionRCL();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SHR:
InstructionSHR();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SHL:
InstructionSHL();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SAR:
InstructionSAR();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.OR:
InstructionOR();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.XOR:
InstructionXOR();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.AND:
InstructionAND();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ANDN:
InstructionANDN();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MUXC:
InstructionMUXC();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MUXNC:
InstructionMUXNC();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MUXZ:
InstructionMUXZ();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MUXNZ:
InstructionMUXNZ();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.REV:
InstructionREV();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.NEG:
InstructionNEG();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ABS:
InstructionABS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ABSNEG:
InstructionABSNEG();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.NEGC:
InstructionNEGC();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.NEGNC:
InstructionNEGNC();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.NEGZ:
InstructionNEGZ();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.NEGNZ:
InstructionNEGNZ();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MOV:
InstructionMOV();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MOVS:
InstructionMOVS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MOVD:
InstructionMOVD();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MOVI:
InstructionMOVI();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.JMPRET:
InstructionJMPRET();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MINS:
InstructionMINS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MAXS:
InstructionMAXS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MIN:
InstructionMIN();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.MAX:
InstructionMAX();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ADD:
InstructionADD();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ADDABS:
InstructionADDABS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ADDX:
InstructionADDX();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ADDS:
InstructionADDS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.ADDSX:
InstructionADDSX();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUB:
InstructionSUB();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUBABS:
InstructionSUBABS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUBX:
InstructionSUBX();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUBS:
InstructionSUBS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUBSX:
InstructionSUBSX();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUMC:
InstructionSUMC();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUMNC:
InstructionSUMNC();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUMZ:
InstructionSUMZ();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.SUMNZ:
InstructionSUMNZ();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.CMPS:
InstructionCMPS();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.CMPSX:
InstructionCMPSX();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
case Assembly.InstructionCodes.CMPSUB:
InstructionCMPSUB();
State = CogRunState.WaitCycles;
StateCount = 4;
break;
// Decrement and continue instructions ( 4/8 cycles )
case Assembly.InstructionCodes.DJNZ:
StateCount = InstructionDJNZ() ? 4 : 8;
State = CogRunState.WaitCycles;
break;
case Assembly.InstructionCodes.TJNZ:
StateCount = InstructionTJNZ() ? 4 : 8;
State = CogRunState.WaitCycles;
break;
case Assembly.InstructionCodes.TJZ:
StateCount = InstructionTJZ() ? 4 : 8;
State = CogRunState.WaitCycles;
break;
// Delay execution instructions ( 4 cycles for instruction decode, 1+ for instruction )
case Assembly.InstructionCodes.WAITPEQ:
NextState = CogRunState.WaitPinsEqual;
State = CogRunState.WaitPreWait;
StateCount = 4;
break;
case Assembly.InstructionCodes.WAITPNE:
NextState = CogRunState.WaitPinsNotEqual;
State = CogRunState.WaitPreWait;
StateCount = 4;
break;
case Assembly.InstructionCodes.WAITCNT:
NextState = CogRunState.WaitCount;
State = CogRunState.WaitPreWait;
StateCount = 4;
break;
case Assembly.InstructionCodes.WAITVID:
InstructionWAITVID();
NextState = CogRunState.WaitVideo;
State = CogRunState.WaitPreWait;
StateCount = 4;
break;
}
// Prefetch instruction
Operation = ReadLong(ProgramCursor);
// Check if it's time to trigger a breakpoint
return ProgramCursor != BreakPointCogCursor;
}
override public void GetVideoData (out uint colors, out uint pixels)
{
colors = DestinationValue;
pixels = SourceValue;
if (State == CogRunState.WaitVideo)
{
State = CogRunState.WaitCycles;
StateCount = 3; // Minimum of 7 clocks in total
FrameFlag = FrameState.FrameHit;
}
else
{
// Frame counter ran out while not in WAIT_VID
FrameFlag = FrameState.FrameMiss;
}
}
}
}