public void executeLDR()
{
int operand2int = Convert.ToInt32(operand2);
if (u == 0)
{
operand2int *= -1;
}
//gettin rn
if (p == 1)
{
addr = (uint)(myRegister.ReadWord(rn) + operand2int);
}
else if (p == 0)
{
addr = myRegister.ReadWord(rn);
}
//performing the load
if (bs == 0)
{
if (!disassembling)
{
myRegister.WriteWord(rd, myMemory.ReadWord(addr));
}
disassembly = "ldr" + Instructions.firstOpcode + " ";
}
else if (bs == 1)
{
if (!disassembling)
{
myRegister.WriteWord(rd, myMemory.ReadByte(addr));
}
disassembly = "ldrb" + Instructions.firstOpcode + " ";
}
disassembly += "r" + Convert.ToString(rd);
//writeback?
if (p == 1 && w == 1)
{
if (!disassembling)
{
myRegister.WriteWord(rn, addr);
}
disassembly += "!";
}
disassembly += ", [r" + Convert.ToString(rn) + opTwoDissasembly + "]";
}
//Method: Constructor
//Purpose: Sets CPU up for use.
//Variables: toMemory - Memory object that Computer setup.
// toRegisters - Registers object that Computer setup.
// programCounter - uint signifying where to start fetch at.
public CPU(Memory toMemory, Registers toRegisters, uint programCounter)
{
disassembling = false;
myMemory = toMemory;
myRegisters = toRegisters;
myRegisters.WriteWord(15, programCounter);
}
//Method: Constructor
//Purpose: Sets CPU up for use.
//Variables: toMemory - Memory object that Computer setup.
// toRegisters - Registers object that Computer setup.
// programCounter - uint signifying where to start fetch at.
public CPU(Memory toMemory, Registers toRegisters, uint programCounter)
{
disassembling = false;
myMemory = toMemory;
myRegisters = toRegisters;
myRegisters.WriteWord(15, programCounter);
}
public void executeMUL()
{
myRegister.WriteWord(rd, (myRegister.ReadWord(rs) * myRegister.ReadWord(rm)));
}
public void executeB()
{
Computer.storedBranchPC = (int)myRegister.ReadWord(15) - 8;
myRegister.WriteWord(15, myRegister.ReadWord(15) + 4 + targetAddr);
}
public void executeMOV()
{
myRegister.WriteWord(rd, operand2);
}
