//--------------------------------------------------------------
// Purpose: Calculates the address to reference for Load/Store instructions
// Returns: The uint value of the address to reference
//--------------------------------------------------------------
private static uint GetLdStoreAddress(LdStore instr)
{
uint refAddress, offset;
if (Memory.ExtractBits(instr.instructionData, 25, 25) == 0)
{
offset = (uint)instr.immediateVal; // immediate offset
}
else
{
offset = BarrelShifter.rotateVal(Computer.GetCPU().registers.ReadWord((uint)(instr.RM * 4)), instr.shiftType, instr.shiftVal); // imm shifted register
}
if (instr.RN * 4 == (int)regs.PC)
{
offset += 4; // to take into account PC reference
}
if (!instr.U)
{
refAddress = Computer.GetCPU().registers.ReadWord((uint)(instr.RN * 4)) - offset;
}
else
{
uint val = Computer.GetCPU().registers.ReadWord((uint)(instr.RN * 4));
refAddress = val + offset;
}
return(refAddress);
}
private void updateStackPanel(bool findBtnClick)
{
uint stackpointer = ParseAddress(Computer.GetCPU().registers.ReadWord((uint)regs.SP).ToString("x8"));
stackpointer -= 0x00000050;
stackPanel.Items.Clear();
for (int i = 0; i < 0x00000b0; i += 16, stackpointer += 16)
{
ListViewItem item = new ListViewItem("0x" + stackpointer.ToString("x8"));
for (uint j = 0; j < 16; j++)
{
byte b = comp.progRAM.ReadByte(stackpointer | j);
item.SubItems.Add(b.ToString("x2"));
}
stackPanel.Items.Add(item);
}
//item.SubItems.Add("0x" + Computer.GetCPU().progRAM.ReadWord(stackpointer).ToString("x8"));
//item.SubItems.Add("0x" + Computer.GetCPU().progRAM.ReadWord(stackpointer + 4).ToString("x8"));
//item.SubItems.Add("0x" + Computer.GetCPU().progRAM.ReadWord(stackpointer + 8).ToString("x8"));
//item.SubItems.Add("0x" + Computer.GetCPU().progRAM.ReadWord(stackpointer + 12).ToString("x8"));
//stackPanel.Items.Add(item);
}
private void WriteElfFileToMemory(FileStream strm, ELF elfHeader, byte[] data)
{
Trace.WriteLine("Loader: Reading ELF File...");
strm.Seek(elfHeader.e_phoff, SeekOrigin.Begin); // seek to the program header offset
data = new byte[elfHeader.e_phentsize]; // allocate byte array the size of the program header
strm.Read(data, 0, (int)elfHeader.e_phentsize); // <data> contains program header
int p_offset = (int)BitConverter.ToUInt16(data, 4); // read start of segment
int p_filesz = (int)BitConverter.ToUInt16(data, 16); // read file size
uint p_vaddr = BitConverter.ToUInt16(data, 8); // read storage address
Trace.WriteLine("Loader: Reading program header...");
strm.Seek(p_offset, SeekOrigin.Begin); // seek to beginning of program segment
byte[] programData = new byte[p_filesz]; // create holder for program data
Trace.WriteLine("Loader: Program header offset: " + p_offset);
Trace.WriteLine("Loader: Program file size: " + p_filesz);
Trace.WriteLine("Loader: Writing program to RAM...");
strm.Read(programData, 0, p_filesz); // read program into <programData>
for (uint j = 0; j < programData.Length; j++)
{
Computer.GetCPU().progRAM.WriteByte(p_vaddr + j, programData[j]);
}
elfHeader.e_phoff += elfHeader.e_phentsize; // move to next program header
Trace.WriteLine("Loader: Program written to RAM successfully!");
Trace.WriteLine(""); // blank line for file readability
}
//--------------------------------------------------------------
// Purpose: Stores data in instr.RD into address according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void STR(LdStore instr, bool generateDisasm)
{
if (!generateDisasm)
{
uint refAddress = GetLdStoreAddress(instr);
if (instr.B)
{
byte dataToStore = Computer.GetCPU().registers.ReadByte((uint)(instr.RD * 4));
Computer.GetCPU().progRAM.WriteByte(refAddress, dataToStore);
}
else
{
uint dataToStore = Computer.GetCPU().registers.ReadWord((uint)(instr.RD * 4));
Computer.GetCPU().progRAM.WriteWord(refAddress, dataToStore);
}
}
else
{
if (!instr.B)
{
instr.disasm.instruction = "str";
}
else
{
instr.disasm.instruction = "strb";
}
SetLdStoreDisassembly(instr);
}
}
//--------------------------------------------------------------
// Purpose: Runs loader tests
// Returns: nothing
//--------------------------------------------------------------
public static void TestLoader()
{
Computer comp = new Computer();
Console.WriteLine("Testing loader...");
// Loader tests
string elfpath = "test3.exe";
comp.ReadELF(elfpath);
int checksum = calculateChecksum(Computer.GetCPU().progRAM.memory);
Debug.Assert(checksum == 536860694);
comp.ResetRam();
elfpath = "test2.exe";
comp.ReadELF(elfpath);
checksum = calculateChecksum(Computer.GetCPU().progRAM.memory);
Debug.Assert(checksum == 536864418);
comp.ResetRam();
elfpath = "test1.exe";
comp.ReadELF(elfpath);
checksum = calculateChecksum(Computer.GetCPU().progRAM.memory);
Debug.Assert(checksum == 536861081);
Trace.WriteLine("Loader tests passed!");
}
//--------------------------------------------------------------
// Purpose: Computes the value of operand2 in data processing instructions
// Returns: The uint value of the instruction's operand2
//--------------------------------------------------------------
private static uint ComputeValue(Data instr)
{
op2Type op2 = Operation.CheckOperand2(instr);
shiftType shift = Operation.CheckShiftType(instr);
Memory registers = Computer.GetCPU().registers;
uint value = 0, adjustPC = 0;
if (instr.RM * 4 == (int)regs.PC || instr.RS * 4 == (int)regs.PC)
{
adjustPC = 4;
}
switch (op2)
{
case op2Type.imm:
value = BarrelShifter.rotateVal((uint)instr.immediateVal, (byte)shiftType.ror, (uint)instr.rotateVal * 2);
break;
case op2Type.reg_imm:
value = BarrelShifter.rotateVal(registers.ReadWord((uint)instr.RM * 4) + adjustPC, instr.shiftType, instr.shiftVal);
break;
case op2Type.reg_reg:
value = BarrelShifter.rotateVal(registers.ReadWord((uint)instr.RM * 4) + adjustPC, instr.shiftType, registers.ReadWord((uint)instr.RS * 4) + adjustPC);
break;
}
return(value);
}
private void ResetRegisters()
{
for (uint i = 0; i < 64; i += 4)
{
Computer.GetCPU().registers.WriteWord(i, 0);
}
}
//--------------------------------------------------------------
// Purpose: Clears and updates the disassembly panel with fake data to look good
// Returns: nothing
//--------------------------------------------------------------
private void initializeDisassemblyPanel()
{
disassemblyListView.Items.Clear();
disassemblyListView.FullRowSelect = true;
// back up program counter
uint data = 1;
uint pc = origPC; // create PC temp outside loop for efficiency reasons
bool end = false;
Memory mem = Computer.GetCPU().progRAM;
Computer.GetCPU().registers.WriteWord((uint)regs.PC, origPC); // ensure accurate PC value is stored in PC
while (!end)
{
data = Computer.GetCPU().progRAM.ReadWord(pc);
Instruction i = Computer.GetCPU().Decode(data);
ListViewItem item = new ListViewItem(i.disasm.address);
item.SubItems.Add(i.disasm.instrCode);
item.SubItems.Add(i.disasm.instruction);
item.SubItems.Add(i.disasm.value);
disassemblyListView.Items.Add(item);
pc += 4;
Computer.GetCPU().registers.WriteWord((uint)regs.PC, pc); // update PC for disassembly generation
if (data == 0)
{
end = true;
// erase the last row added to the ListView
disassemblyListView.Items.RemoveAt(disassemblyListView.Items.Count - 1);
}
}
finalPC = pc; // store final PC value
Computer.GetCPU().registers.WriteWord((uint)regs.PC, origPC); // restore value of program counter
}
//--------------------------------------------------------------
// Purpose: Loads contents of sequential memory addresses starting at
// instr.RN into registers specified in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void LDMFD(LoadStoreMultiple instr, bool generateDisasm)
{
instr.disasm.instruction = "ldmfd";
uint count = 0;
uint backup = instr.regList, mask = 0x00000001;
ArrayList regList = new ArrayList(); // store addresses of registers to be stored
ArrayList disasmList = new ArrayList();
if (!generateDisasm)
{
for (int i = 0; i < 17; i++, count += 4)
{
byte lsb = (byte)(backup & mask);
if (lsb == 1)
{
regList.Add(count);
}
backup >>= 1;
}
uint RN = Computer.GetCPU().registers.ReadWord((uint)instr.RN * 4);
uint address = RN;
for (int i = 0; i < regList.Count; i++)
{
//if (!instr.U) address -= 4;
uint data = Computer.GetCPU().progRAM.ReadWord(address);
Computer.GetCPU().registers.WriteWord((uint)regList[i], data);
address += 4;
}
if (instr.W)
{
Computer.GetCPU().registers.WriteWord((uint)instr.RN * 4, RN + ((uint)regList.Count * 4));
}
}
else
{
for (int i = 0; i < 17; i++, count += 4)
{
byte lsb = (byte)(backup & mask);
if (lsb == 1)
{
disasmList.Add("r" + count / 4);
}
backup >>= 1;
}
instr.disasm.value = "r" + instr.RN.ToString() + (instr.W ? "" : "!") + ", {";
foreach (string s in disasmList)
{
instr.disasm.value += s + ", ";
}
instr.disasm.value = instr.disasm.value.Substring(0, instr.disasm.value.Length - 2) + "}";
}
// read value at instr.RN into lowest register in instr.regList
// continue reading values in sequential memory addresses into registers listed from least to greatest
// read direction is specified by instr.U
}
//--------------------------------------------------------------
// Purpose: Stores multiple registers into memory starting at address
// in instr.RN
// Returns: nothing
//--------------------------------------------------------------
public void STMFD(LoadStoreMultiple instr, bool generateDisasm)
{
instr.disasm.instruction = "stmfd";
uint count = 0;
uint backup = instr.regList, mask = 0x00000001;
ArrayList regList = new ArrayList(); // store addresses of registers to be stored
ArrayList disasmList = new ArrayList();
if (!generateDisasm)
{
for (int i = 0; i < 17; i++, count += 4)
{
byte lsb = (byte)(backup & mask);
if (lsb == 1)
{
regList.Add(count);
}
backup >>= 1;
}
uint RN = Computer.GetCPU().registers.ReadWord((uint)instr.RN * 4);
uint address = RN - ((uint)regList.Count * 4);
for (int i = 0; i < regList.Count; i++)
{
//if (!instr.U) address -= 4;
uint data = Computer.GetCPU().registers.ReadWord((uint)regList[i]);
Computer.GetCPU().progRAM.WriteWord(address, data);
address += 4;
}
if (instr.W)
{
Computer.GetCPU().registers.WriteWord((uint)instr.RN * 4, RN - ((uint)regList.Count * 4));
}
}
else
{
for (int i = 0; i < 17; i++, count += 4)
{
byte lsb = (byte)(backup & mask);
if (lsb == 1)
{
disasmList.Add("r" + count / 4);
}
backup >>= 1;
}
instr.disasm.value = "r" + instr.RN.ToString() + (instr.W ? "" : "!") + ", {";
foreach (string s in disasmList)
{
instr.disasm.value += s + ", ";
}
instr.disasm.value = instr.disasm.value.Substring(0, instr.disasm.value.Length - 2) + "}";
}
// store values in registers held in instr.regList to address in instr.RN
// if instr.W is set, write the current PC value back into the PC
}
private static uint ComputeBranchAddress(Branch instr)
{
uint val = (uint)instr.immediateVal;
uint val2 = val << 8;
uint addr = BarrelShifter.rotateVal((uint)instr.immediateVal << 8, 0x02, 6);
//addr <<= 2;
uint PC = Computer.GetCPU().registers.ReadWord((uint)regs.PC) + 8;
addr += Computer.GetCPU().registers.ReadWord((uint)regs.PC) + 8;
return(addr);
}
//--------------------------------------------------------------
// Purpose: Performs an multiply instruction according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void MUL(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
instr.disasm.instruction = "mul";
uint value = registers.ReadWord((uint)(instr.RM * 4)) * registers.ReadWord((uint)(instr.RS * 4));
if (generateDisasm)
{
instr.disasm.value = Disassembly.DataMul(instr);
}
else
{
Computer.GetCPU().registers.WriteWord((uint)(instr.RD * 4), value);
}
}
//--------------------------------------------------------------
// Purpose: Performs a move according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void MOV(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
uint value = ComputeValue(instr);
instr.disasm.instruction = "mov";
if (generateDisasm)
{
SetDataDisassembly(instr, value, true);
}
else
{
Computer.GetCPU().registers.WriteWord((uint)(instr.RD * 4), value);
}
}
public void B(Branch instr, bool generateDisasm)
{
if (generateDisasm)
{
instr.disasm.instruction = "b" + GetSuffix(instr);
SetBranchDisassembly(instr);
}
else
{
if (CheckCond(instr))
{
uint addr = ComputeBranchAddress(instr) - 4;
Computer.GetCPU().registers.WriteWord((uint)regs.PC, addr);
}
}
}
//--------------------------------------------------------------
// Purpose: Performs a bit clear according to data in <instr>;
// a bitwise AND is performed on one value and the complement
// of a second value
// Returns: nothing
//--------------------------------------------------------------
public void BIC(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
instr.disasm.instruction = "eor";
uint value = ComputeValue(instr);
if (generateDisasm)
{
SetDataDisassembly(instr, value, false);
}
else
{
uint bicVal = registers.ReadWord((uint)instr.RN * 4) & ~value;
registers.WriteWord((uint)(instr.RD * 4), bicVal);
}
}
//--------------------------------------------------------------
// Purpose: Performs a reverse subtraction according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void RSB(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
instr.disasm.instruction = "rsb";
uint value = ComputeValue(instr), difference;
if (generateDisasm)
{
SetDataDisassembly(instr, value, false);
}
else
{
difference = value - registers.ReadWord((uint)instr.RN * 4);
registers.WriteWord((uint)(instr.RD * 4), difference);
}
}
//--------------------------------------------------------------
// Purpose: Highlights the row corresponding with the current PC value
// Returns: nothing
//--------------------------------------------------------------
private void updateDisassemblyPanel()
{
uint pc = Computer.GetCPU().registers.ReadWord((uint)regs.PC);
if (pc > origPC && pc < finalPC - 4)
{
string strpc = "0x" + pc.ToString("x8");
ListViewItem i = disassemblyListView.FindItemWithText(strpc);
int index1 = i.Index;
for (int j = 0; j < disassemblyListView.Items.Count; j++)
{
disassemblyListView.Items[j].Selected = false;
}
disassemblyListView.Items[index1].Selected = true;
}
}
//--------------------------------------------------------------
// Purpose: Performs a bitwise AND according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void AND(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
instr.disasm.instruction = "and";
uint value = ComputeValue(instr);
if (generateDisasm)
{
SetDataDisassembly(instr, value, false);
}
else
{
uint andVal = value & registers.ReadWord((uint)instr.RN * 4);
registers.WriteWord((uint)(instr.RD * 4), andVal);
}
}
//--------------------------------------------------------------
// Purpose: Performs a subtraction according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void SUB(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
instr.disasm.instruction = "sub";
uint value = ComputeValue(instr), difference;
if (generateDisasm)
{
SetDataDisassembly(instr, value, false);
}
else // if not generating disassembly, execute the instruction
{
difference = registers.ReadWord((uint)instr.RN * 4) - value;
registers.WriteWord((uint)(instr.RD * 4), difference);
}
}
public void BX(Branch instr, bool generateDisasm)
{
if (generateDisasm)
{
instr.disasm.instruction = "bx" + GetSuffix(instr);
instr.disasm.value = "r" + instr.RM.ToString();
}
else
{
Memory mem = Computer.GetCPU().registers;
uint data = mem.ReadWord((uint)instr.RM * 4);
uint d = data & 0xFFFFFFFE;
if (CheckCond(instr))
{
mem.WriteWord((uint)regs.PC, mem.ReadWord((uint)instr.RM * 4) & 0xFFFFFFFE);
}
}
}
//--------------------------------------------------------------
// Purpose: Performs an addition according to data in <instr>
// Returns: nothing
//--------------------------------------------------------------
public void ADD(Data instr, bool generateDisasm)
{
Memory registers = Computer.GetCPU().registers;
uint value = 0, sum;
instr.disasm.instruction = "add";
value = ComputeValue(instr);
if (generateDisasm)
{
SetDataDisassembly(instr, value, false);
}
else
{
sum = value + registers.ReadWord((uint)instr.RN * 4);
registers.WriteWord((uint)(instr.RD * 4), sum);
}
}
private void executeBtn_Click(object sender, EventArgs e)
{
string data = executeTxtBox.Text;
if (data.Substring(0, 2) == "0x" && data.Length == 10)
{
try
{
string str = data.Substring(2);
Instruction i = Computer.GetCPU().Decode(UInt32.Parse(str, System.Globalization.NumberStyles.AllowHexSpecifier));
Computer.GetCPU().Execute(i, false);
}
catch { }
}
else
{
executeTxtBox.Text = "Invalid";
}
}
public void CMP(Data instr, bool generateDisasm)
{
uint RN = Computer.GetCPU().registers.ReadWord((uint)instr.RN * 4);
instr.disasm.instruction = "cmp";
uint value = ComputeValue(instr);
if (generateDisasm)
{
SetCMPDisassembly(instr, value);
}
else
{
CPU cpu = Computer.GetCPU();
cpu.SetNFlag(Memory.ExtractBits(RN - value, 31, 31) == 0 ? false : true);
cpu.SetZFlag(value - RN == 0 ? true : false);
cpu.SetCFlag(value > RN ? false : true);
cpu.SetFFlag(ComputeFFlag((int)RN, (int)value, "sub"));
}
}
//--------------------------------------------------------------
// Purpose: "Software Interrupt" stops the CPU
// Returns: nothing
//--------------------------------------------------------------
public void SWI(SWI instr, bool generateDisasm)
{
if (generateDisasm)
{
instr.disasm.instruction = "swi";
instr.disasm.value = "0x" + instr.immediateVal.ToString("x2");
}
else
{
if (instr.immediateVal == 0x11)
{
instr.haltExecution = true;
}
else if (instr.immediateVal == 0x00)
{
observer.ChangeText((char)Computer.GetCPU().registers.ReadByte((uint)regs.r0));
}
else if (instr.immediateVal == 0x6a)
{
uint addr = Computer.GetCPU().registers.ReadWord((uint)regs.r1);
Memory progRAM = Computer.GetCPU().progRAM;
char c = ' ';
uint max = Computer.GetCPU().registers.ReadWord((uint)regs.r2);
while (!Computer.crTyped)
{
} // wait
for (uint i = 0; i < max; i++)
{
c = Computer.charBuffer[i];
progRAM.WriteByte(addr + i, (byte)c);
if (c == '\0')
{
break;
}
}
}
else
{
} // do nothing
}
}
//--------------------------------------------------------------
// Purpose: Initializes the memory panel with data from memory
// Returns: nothing
//--------------------------------------------------------------
private void initializeMemoryPanel()
{
for (uint addr = 0; addr < comp.progRAM.memory.Length;)
{
uint firstWord = comp.progRAM.ReadWord(addr);
uint secondWord = comp.progRAM.ReadWord(addr + 4);
uint thirdWord = comp.progRAM.ReadWord(addr + 8);
uint fourthWord = comp.progRAM.ReadWord(addr + 12);
ListViewItem item = new ListViewItem("0x" + addr.ToString("x8"));
item.SubItems.Add("0x" + firstWord.ToString("x8"));
item.SubItems.Add("0x" + secondWord.ToString("x8"));
item.SubItems.Add("0x" + thirdWord.ToString("x8"));
item.SubItems.Add("0x" + fourthWord.ToString("x8"));
memoryListView.Items.Add(item);
addr += 16;
}
FindItemInMemoryPanel(Computer.GetCPU().registers.ReadWord((uint)regs.PC));
}
//--------------------------------------------------------------
// Purpose: Currently clears and updates flags panel with flag names and "false" values
// Returns: nothing
//--------------------------------------------------------------
private void updateFlagsPanel()
{
flagsListView.Items.Clear();
CPU c = Computer.GetCPU();
ListViewItem NFlag = new ListViewItem("N");
NFlag.SubItems.Add(c.NFlag.ToString());
ListViewItem ZFlag = new ListViewItem("Z");
ZFlag.SubItems.Add(c.ZFlag.ToString());
ListViewItem CFlag = new ListViewItem("C");
CFlag.SubItems.Add(c.CFlag.ToString());
ListViewItem FFlag = new ListViewItem("F");
FFlag.SubItems.Add(c.FFlag.ToString());
ListViewItem IFlag = new ListViewItem("I");
IFlag.SubItems.Add(c.IFlag.ToString());
flagsListView.Items.AddRange(new ListViewItem[] { NFlag, ZFlag, CFlag, FFlag, IFlag });
}
//--------------------------------------------------------------
// Purpose: Loads the file <fileToLoad> and reads it into RAM
// Returns: nothing
//--------------------------------------------------------------
private void LoadFile(string fileToLoad)
{
try
{
comp.ResetRam();
comp.ResetEnd();
Computer.GetCPU().ClearFlags();
Memory ram = comp.progRAM;
filename = fileToLoad;
if (comp.ReadELF(fileToLoad))
{
origPC = Computer.GetCPU().registers.ReadWord((uint)regs.PC);
findAddressTxtBox.Text = "0x" + Computer.GetCPU().registers.ReadWord((uint)regs.PC).ToString("x8");
initializeDisassemblyPanel();
initializeMemoryPanel();
updateGUI();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
//--------------------------------------------------------------
// Purpose: Writes register values and other data to trace file <file>
// Returns: nothing
//--------------------------------------------------------------
private void WriteToTraceFile(StreamWriter file)
{
if (file.BaseStream == null)
{
}
else
{
CPU cpu = Computer.GetCPU();
string stepNum = cpu.stepNum.ToString("000000");
string progCounter = cpu.pcCopy.ToString("X8");
string checksum = calculateChecksum(progRAM.memory).ToString("X8");
char n = cpu.NFlag ? '1' : '0';
char z = cpu.ZFlag ? '1' : '0';
char c = cpu.CFlag ? '1' : '0';
char f = cpu.FFlag ? '1' : '0';
string flags = "" + n + z + c + f;
string r0 = "0=" + registers.ReadWord((uint)regs.r0).ToString("X8");
string r1 = "1=" + registers.ReadWord((uint)regs.r1).ToString("X8");
string r2 = "2=" + registers.ReadWord((uint)regs.r2).ToString("X8");
string r3 = "3=" + registers.ReadWord((uint)regs.r3).ToString("X8");
string r4 = "4=" + registers.ReadWord((uint)regs.r4).ToString("X8");
string r5 = "5=" + registers.ReadWord((uint)regs.r5).ToString("X8");
string r6 = "6=" + registers.ReadWord((uint)regs.r6).ToString("X8");
string r7 = "7=" + registers.ReadWord((uint)regs.r7).ToString("X8");
string r8 = "8=" + registers.ReadWord((uint)regs.r8).ToString("X8");
string r9 = "9=" + registers.ReadWord((uint)regs.r9).ToString("X8");
string r10 = "10=" + registers.ReadWord((uint)regs.r10).ToString("X8");
string r11 = "11=" + registers.ReadWord((uint)regs.r11).ToString("X8");
string r12 = "12=" + registers.ReadWord((uint)regs.FP).ToString("X8");
string r13 = "13=" + registers.ReadWord((uint)regs.SP).ToString("X8");
string r14 = "14=" + registers.ReadWord((uint)regs.LR).ToString("X8");
file.WriteLine("{0} {1} {2} {3} {4,10} {5,10} {6,10} {7,10}", stepNum, progCounter, checksum, flags, r0, r1, r2, r3);
file.WriteLine("{0,18} {1,10} {2,10} {3,10} {4,10} {5,10}", r4, r5, r6, r7, r8, r9);
file.WriteLine("{0,18} {1,10} {2,10} {3,10} {4,10}", r10, r11, r12, r13, r14);
}
}
private static bool CheckCond(Instruction instr)
{
CPU cpu = Computer.GetCPU();
switch (instr.cond)
{
case 0x00:
if (cpu.ZFlag)
{
return(true);
}
break;
case 0x01:
if (!cpu.ZFlag)
{
return(true);
}
break;
case 0x02:
if (cpu.CFlag)
{
return(true);
}
break;
case 0x03:
if (!cpu.CFlag)
{
return(true);
}
break;
case 0x04:
if (cpu.NFlag)
{
return(true);
}
break;
case 0x05:
if (!cpu.NFlag)
{
return(true);
}
break;
case 0x06:
if (cpu.FFlag)
{
return(true);
}
break;
case 0x07:
if (!cpu.FFlag)
{
return(true);
}
break;
case 0x08:
if (cpu.CFlag && !cpu.ZFlag)
{
return(true);
}
break;
case 0x09:
if (!cpu.CFlag || cpu.ZFlag)
{
return(true);
}
break;
case 0x0a:
if ((cpu.NFlag && cpu.FFlag) || (!cpu.NFlag && !cpu.FFlag))
{
return(true);
}
break;
case 0x0b:
if ((cpu.NFlag && !cpu.FFlag) || (!cpu.CFlag && cpu.FFlag))
{
return(true);
}
break;
case 0x0c:
if (!cpu.ZFlag && ((cpu.NFlag && cpu.FFlag) || (!cpu.NFlag && !cpu.FFlag)))
{
return(true);
}
break;
case 0x0d:
if (cpu.ZFlag || ((cpu.NFlag && !cpu.FFlag) || (!cpu.NFlag && cpu.FFlag)))
{
return(true);
}
break;
case 0x0e:
return(true);
}
return(false);
}
private void LoadDisasmAddrAndCode()
{
this.disasm.address = "0x" + Computer.GetCPU().registers.ReadWord((uint)regs.PC).ToString("x8");
this.disasm.instrCode = "0x" + this.instructionData.ToString("x8");
}
