}//onRestart
//Execute an SWI instruction.
/// <summary>
/// Called when an swi 0x0000 to swi 0x00ff is executed
/// </summary>
/// <param name="op_code">opcode being executed</param>
/// <returns>number of cycles executed. 0 if none</returns>
public uint Execute(uint op_code)
{
//extract the bottom 8 bits to get swi code.
uint swi_code = op_code & 0x000000ff;
try
{
//and execute based on the swi code.
switch (swi_code)
{
//write a character to Outputview
//r0: character to output
case 0x00:
{
char c = (char)mIhost.getReg(0);
mIhost.OutputConsoleString(new string(c, 1));
} break;
//write a character string to Outputview
//r0: address of (null terminated) string to display
case 0x02:
{
string s = ARMPluginInterfaces.Utils.loadStringFromMemory(mIhost, mIhost.getReg(0), 256);
mIhost.OutputConsoleString(s);
} break;
//SWI_Exit
case 0x11:
mIhost.HaltSimulation();
mIhost.GPR[15] -= 4; //todo thumb mode?
this.closeAllStreams();
break;
//SWI_HeapMalloc
//r0: size of block in bytes
//Output: C set on error
//r0: address of allocated block (or 0 if error)
case 0x12:
mIhost.setReg(0, mIhost.Malloc(mIhost.getReg(0)));
mIhost.cf = (mIhost.getReg(0) == 0);
break;
//SWI_HeapClear
case 0x13:
mIhost.HeapClear();
break;
//write a character to an open file
//r0: file handle (value 1 == screen)
//r1: character to output
//Output: C flag set on error
case 0x60:
{
string text = ARMPluginInterfaces.Utils.loadStringFromMemory(mIhost, mIhost.getReg(1), 1);
uint fileHandle = mIhost.getReg(0);
if (fileHandle < mFiles.Count)
{
mFiles[(int)fileHandle].Write(text);
mIhost.cf = false;
}
else
{
mIhost.cf = true;
}
} break;
//read one byte (an ASCII character?) from an open file
//r0: file handle (value 0 == keyboard)
//Output: C flag set on error
//r0: the byte read from the file, or -1 if at EOF
case 0x61:
{
uint fileHandle = mIhost.getReg(0);
bool error = fileHandle >= mFiles.Count;
if (!error)
{
int ch = (char)mFiles[(int)fileHandle].Read();
mIhost.setReg(0, (uint)ch);
}
mIhost.cf = error;
} break;
//read bytes from an open file
//r0: file handle
//r1: input buffer address
//r2: buffer size (number of bytes to read)
case 0x62:
{
uint fileHandle = mIhost.getReg(0);
uint address = mIhost.getReg(1);
uint maxbytes = mIhost.getReg(2);
bool error = fileHandle >= mFiles.Count;
//special case if maxbytes is 0. Just return a success.
if (maxbytes == 0 || error)
{
mIhost.cf = error;
mIhost.setReg(0, 0);
break;
}
uint storedBytes = 0;
while (storedBytes < maxbytes)
{
int ch = (int)mFiles[(int)fileHandle].Read();
if (ch < 0)
{
break;
}
mIhost.SetMemory(address++, ARMPluginInterfaces.MemorySize.Byte, (uint)ch);
storedBytes++;
}
mIhost.cf = false;
mIhost.setReg(0, storedBytes);
} break;
//write bytes to an open file
//r0: file handle
//r1: output buffer address
//r2: buffer size (number of bytes to write)
//Output: C flag set on error
//r0: the number of bytes successfully written to the file
case 0x63:
{
uint fileHandle = mIhost.getReg(0);
uint address = mIhost.getReg(1);
uint maxbytes = mIhost.getReg(2);
bool error = fileHandle >= mFiles.Count;
//special case if maxbytes is 0. Just return a success.
if (maxbytes == 0 || error)
{
mIhost.cf = error;
mIhost.setReg(0, 0);
break;
}
uint copiedBytes = 0;
while (copiedBytes < maxbytes)
{
uint ch = mIhost.GetMemory(address++, ARMPluginInterfaces.MemorySize.Byte);
mFiles[(int)fileHandle].Write((char)ch);
copiedBytes++;
}
mIhost.cf = false;
mIhost.setReg(0, copiedBytes);
}
break;
//open text file for input or output
//r0: pointer to filename to open, null terminated
//r1: mode -- 0 means input, 1 means output, 2 means append, 0x100 - stdconsole(filename used as title).
//Output: C flag set on error
//r0: file handle(-1 on error)
case 0x66:
{
bool bError = true;
string str = ARMPluginInterfaces.Utils.loadStringFromMemory(mIhost, mIhost.getReg(0), 256);
string currDir = Directory.GetCurrentDirectory();
if (!string.IsNullOrEmpty(mIhost.UserDirectory))
{
Directory.SetCurrentDirectory(mIhost.UserDirectory);
}
ARMSimStream astream = null;
try
{
switch (mIhost.getReg(1))
{
case 0:
astream = new InputARMSimFileStream(new StreamReader(File.OpenRead(str)));
break;
case 1:
astream = new OutputARMSimFileStream(new StreamWriter(File.Open(str, FileMode.Create)));
break;
case 2:
astream = new OutputARMSimFileStream(new StreamWriter(File.Open(str, FileMode.Append)));
break;
case 0x100:
{ //create a new standardConsole
uint stdHandle = mIhost.CreateStandardConsole(str);
astream = new ARMSimConsoleStream(stdHandle, mIhost);
}
break;
default:
break;
} //switch
uint fileHandle = uint.MaxValue;
if (astream != null)
{
fileHandle = mNextFileHandle++;
mFiles.Add(astream);
bError = false;
}
mIhost.setReg(0, fileHandle);
} //try
catch (Exception)
{
mIhost.setReg(0, uint.MaxValue);
}
Directory.SetCurrentDirectory(currDir);
mIhost.cf = bError;
} break; //case 0x66
//close an open file
//r0: file handle
//Output: C flag set on error
case 0x68:
{
uint handle = mIhost.getReg(0);
if (handle < mFiles.Count)
{
mFiles[(int)handle].Close();
mFiles[(int)handle] = null;
mIhost.cf = false;
}
else
{
mIhost.cf = true;
}
} break;
//write null-terminated string to screen or to open file
//r0: file handle (value 1 == screen)
//r1: address of string to read from memory
//Output: C flag set on error
case 0x69:
{
uint addr = mIhost.getReg(1);
string text = ARMPluginInterfaces.Utils.loadStringFromMemory(mIhost, addr, 256);
uint fileHandle = mIhost.getReg(0);
if (fileHandle < mFiles.Count)
{
mFiles[(int)fileHandle].Write(text);
mIhost.cf = false;
}
else
{
mIhost.cf = true;
}
} break;
//read line of text from open file
//r0: file handle
//r1: location to put read data
//r2: max number of bytes to read (including added null terminator)
//Output: C flag set on error
//r0: number of bytes stored (including added null terminator)
case 0x6a:
{
uint fileHandle = mIhost.getReg(0);
uint maxbytes = mIhost.getReg(2);
bool error = fileHandle >= mFiles.Count;
//special case if maxbytes is 0. Just return a success.
if (maxbytes == 0)
{
mIhost.cf = error;
mIhost.setReg(0, 0);
break;
}
uint storedBytes = 0;
string text = null;
if (!error)
{
text = mFiles[(int)fileHandle].ReadLine();
error = text == null;
}
if (!error)
{
storedBytes = (uint)(text.Length + 1);
if (maxbytes < text.Length)
{
storedBytes = maxbytes;
}
uint address = mIhost.getReg(1);
for (uint i = 0; i < storedBytes - 1; i++)
{
uint data = (uint)(text[(int)i]);
mIhost.SetMemory(address++, ARMPluginInterfaces.MemorySize.Byte, data);
}
mIhost.SetMemory(address++, ARMPluginInterfaces.MemorySize.Byte, 0);
}
mIhost.setReg(0, storedBytes);
mIhost.cf = error;
} break;
//write signed integer to screen or to open file
//r0: file handle (value 1 == screen)
//r1: integer value to write
//Output: C flag set on error
case 0x6b:
{
uint fileHandle = mIhost.getReg(0);
string text = ((int)mIhost.getReg(1)).ToString();
if (fileHandle < mFiles.Count)
{
mFiles[(int)fileHandle].Write(text);
mIhost.cf = false;
}
else
{
mIhost.cf = true;
}
} break;
//read signed integer from open file
//r0: file handle
//Output: C flag set on error
//r0: value of the integer read from file
case 0x6c:
{
int number = 0;
uint fileHandle = mIhost.getReg(0);
ARMSimStream sr = null;
if (fileHandle < mFiles.Count)
{
sr = mFiles[(int)fileHandle];
}
bool error = true;
if (sr != null)
{
error = sr.GetInteger(ref number);
}
if (!error)
{
mIhost.setReg(0, (uint)number);
}
mIhost.cf = error;
} break;
case 0x6d:
//return milliseconds in r0
mIhost.setReg(0, (uint)(DateTime.Now.Ticks / 10000));
break;
//output a double FP number to the console
//r0:register to output (0-15)
//outputs in the same format as the registers view, uses the formatstring "0.###E+0"
case 0x6e:
{
uint reg = mIhost.getReg(0);
if (reg > 15)
{
reportBadRegister(reg, 0x6e);
return(0);
}
double value = mIhost.getFPDoubleReg(reg);
string str = ARMSim.Simulator.VFP.FloatingPointProcessor.DoubleToString(value);
mIhost.OutputConsoleString(str);
} break;
//output a float FP number to the console
//r0:register to output (0-31)
//outputs in the same format as the registers view, uses the formatstring "0.###E+0"
case 0x6f:
{
uint reg = mIhost.getReg(0);
if (reg > 31)
{
reportBadRegister(reg, 0x6f);
return(0);
}
float value = mIhost.getFPSingleReg(reg);
string str = ARMSim.Simulator.VFP.FloatingPointProcessor.FloatToString(value);
mIhost.OutputConsoleString(str);
} break;
//read double value from open file
//r0: file handle
//r1: register to read value into (0-15)
case 0x7b:
{
double number = 0.0;
uint fileHandle = mIhost.getReg(0);
uint reg = mIhost.getReg(1);
if (reg > 15)
{
reportBadRegister(reg, swi_code);
return(0);
}
ARMSimStream sr = null;
if (fileHandle < mFiles.Count)
{
sr = mFiles[(int)fileHandle];
}
bool error = true;
if (sr != null)
{
error = sr.GetDouble(ref number);
}
if (!error)
{
mIhost.setFPDoubleReg(0, number);
}
mIhost.cf = error;
} break;
//read float value from open file
//r0: file handle
//r1: register to read value into (0-31)
case 0x7c:
{
double number = 0.0;
uint fileHandle = mIhost.getReg(0);
uint reg = mIhost.getReg(1);
if (reg > 31)
{
reportBadRegister(reg, swi_code);
return(0);
}
ARMSimStream sr = null;
if (fileHandle < mFiles.Count)
{
sr = mFiles[(int)fileHandle];
} //else
bool error = true;
if (sr != null)
{
error = sr.GetDouble(ref number);
}
if (!error)
{
mIhost.setFPSingleReg(0, (float)number);
}
else
{
mIhost.cf = error;
}
} break;
//output a double FP number to screen or to open file
//r0: file handle (value 1 == screen)
//r1:register to output (0-15)
//outputs in the same format as the registers view, uses the formatstring "0.###E+0"
case 0x7e:
{
uint reg = mIhost.getReg(1);
if (reg > 15)
{
reportBadRegister(reg, swi_code);
return(0);
}
double value = mIhost.getFPDoubleReg(reg);
string text = ARMSim.Simulator.VFP.FloatingPointProcessor.DoubleToString(value);
uint fileHandle = mIhost.getReg(0);
if (fileHandle < mFiles.Count)
{
mFiles[(int)fileHandle].Write(text);
mIhost.cf = false;
}
else
{
mIhost.cf = true;
}
} break;
//output a float FP number to screen or to open file
//r0: file handle (value 1 == screen)
//r1:register to output (0-31)
//outputs in the same format as the registers view, uses the formatstring "0.###E+0"
case 0x7f:
{
uint reg = mIhost.getReg(1);
if (reg > 31)
{
reportBadRegister(reg, swi_code);
return(0);
}
float value = mIhost.getFPSingleReg(reg);
string text = ARMSim.Simulator.VFP.FloatingPointProcessor.FloatToString(value);
uint fileHandle = mIhost.getReg(0);
if (fileHandle < mFiles.Count)
{
mFiles[(int)fileHandle].Write(text);
mIhost.cf = false;
}
else
{
mIhost.cf = true;
}
} break;
default:
//if it is an unknown swi code then return 3 clock cycles executed but
//do no actual work. This prevents the swi exception from being raised
//for swi codes not handled here
break;
} //switch
} //try
catch (Exception ex)
{
ARMPluginInterfaces.Utils.OutputDebugString(
"Exception caught while processing SWI call: 0x" +
swi_code.ToString("X2") + " Message: " + ex.Message);
return(0);
}
return(3);
}//Execute