private void UpdateDisassembly()
{
this.ResetDisassembly();
uint savePC = myComputer.getRegisters().ReadWord(15);
int i = 0;
//save register 15 in TEMPVAR
if (myComputer.getStepNum() > 4)
{
myComputer.getRegisters().WriteWord(15, savePC - 16);
}
else
{
myComputer.getRegisters().WriteWord(15, (uint)(savePC - (myComputer.getStepNum() * 4)));
i = 4 - myComputer.getStepNum();
}
//set register 15 4 commands back. (sub 16).
myComputer.disassembling = true;
myComputer.getCPU().disassembling = true;
//set computer.disassembling to true
//set cpu.disassembling to true
for (; i < 9; i++)
{
myComputer.getCPU().disassembly = "";
myComputer.step();
this.disassemblyView.Rows[i].Cells[0].Value = String.Format("{0:X8}", myComputer.getRegisters().ReadWord(15) - 12);
this.disassemblyView.Rows[i].Cells[1].Value = String.Format("{0:X8}", myComputer.getCPU().unDecodedInstruction);
this.disassemblyView.Rows[i].Cells[2].Value = myComputer.getCPU().disassembly;
//stop stepping if swi
if (myComputer.getCPU().disassembly.Length >= 3 && myComputer.getCPU().disassembly.Substring(0, 3) == "swi")
{
this.disassemblyView.Rows[i].Cells[0].Value = String.Format("{0:X8}", myComputer.getRegisters().ReadWord(15) - 8);
break;
}
}
//step through 9 times.
//grab computer.getregister.readword(15)
//grab computer.getpcu.undecoded instruction
//grab computer.getcpu.disassembly after each step.
this.disassemblyView.Rows[4].DefaultCellStyle.BackColor = Color.LightGray;
//highlight the 5th row
myComputer.getRegisters().WriteWord(15, savePC);
//set register 15 = to TEMPVAR
myComputer.disassembling = false;
myComputer.getCPU().disassembling = false;
//set computer.disassembling to false
}
//Method: RunTests
//Purpose: tests key methods in the CPU class
//Variables: myOptions - Options handle to options to class
public static void RunTests(Options myOptions)
{
myOptions.SetFileName("test1.exe");
Console.WriteLine("testing CPU...");
Computer myTestComp = new Computer(myOptions);
myTestComp.endRun += new Computer.EventHandler(delegate { });
myTestComp.putChar += new Computer.EventHandler(delegate { });
Console.WriteLine("testing Fetch, Decode, and Execute methods...");
//test MOV register
myTestComp.getRegisters().WriteWord(5, 0);
myTestComp.getRegisters().WriteWord(3, 4);
myTestComp.getCPU().Decode((uint)0xE1A05003); //mov r5, r3
myTestComp.getCPU().Execute(); //mov r5, r3
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 4);
//test MOV immediate
myTestComp.getCPU().Decode((uint)0xe3a02030); //mov r2, 48
myTestComp.getCPU().Execute(); //mov r2, 48
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 48);
Debug.Assert(myTestComp.getCPU().disassembly == "mov r2, #48");
//test MUL
myTestComp.getRegisters().WriteWord(4, 2);
myTestComp.getRegisters().WriteWord(2, 8);
myTestComp.getCPU().Decode((uint)0xE0020294); //mul r2, r4, r2
myTestComp.getCPU().Execute(); //mul r2, r4, r2
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 16);
//test SUB
myTestComp.getRegisters().WriteWord(4, 10);
myTestComp.getCPU().Decode((uint)0xE2445003); //sub r5, r4, #3
myTestComp.getCPU().Execute(); //sub r5, r4, #3
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 7);
//test RSB
myTestComp.getRegisters().WriteWord(4, 10);
myTestComp.getCPU().Decode((uint)0xE2645003); //rsb r5, r4, #3
myTestComp.getCPU().Execute(); //rsb r5, r4, #3
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 4294967289);
//test AND
myTestComp.getRegisters().WriteWord(0, 0xFFFF);
myTestComp.getCPU().Decode((uint)0xE20020FF); //and r2, r0, #255
myTestComp.getCPU().Execute(); //and r2, r0, #255
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 255);
//test ORR
myTestComp.getRegisters().WriteWord(0, 0);
myTestComp.getCPU().Decode((uint)0xE3802012); //orr r2, r0, #18
myTestComp.getCPU().Execute(); //orr r2, r0, #18
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 18);
//test EOR
myTestComp.getRegisters().WriteWord(0, 732);
myTestComp.getCPU().Decode((uint)0xE2202FB7); // eor r2, r0, #732
myTestComp.getCPU().Execute(); // eor r2, r0, #732
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 0);
//test LDR
//E5925000 (LDR r5, r2)
myTestComp.getRegisters().WriteWord(5, 11);
myTestComp.getMemory().WriteWord(1, 2462);
myTestComp.getRegisters().WriteWord(2, 1);
myTestComp.getCPU().Decode((uint)0xE5925000); //LDR r5, r2
myTestComp.getCPU().Execute(); //LDR r5, r2
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 2462);
//test STR
//E5821000 (STR r1, r2)
myTestComp.getRegisters().WriteWord(1, 2463);
myTestComp.getRegisters().WriteWord(2, 1);
myTestComp.getCPU().Decode((uint)0xE5821000); //STR r1, r2
myTestComp.getCPU().Execute(); //STR r1, r2
Debug.Assert(myTestComp.getMemory().ReadWord(1) == 2463);
//test LDM
//18914001 (ldm r1, {r0, r14} or something..)
//make r1 = memory address 1
myTestComp.getRegisters().WriteWord(1, 1);
myTestComp.getMemory().WriteWord(1, 2400);
myTestComp.getMemory().WriteWord(5, 2402);
//so r0 should be 2400 and r14 should be 2402
myTestComp.getCPU().Decode((uint)0x18914001); //ldm r1, {r1, r15} or something..
myTestComp.getCPU().Execute(); //ldm r1, {r1, r15} or something..
Debug.Assert(myTestComp.getRegisters().ReadWord(0) == 2400);
Debug.Assert(myTestComp.getRegisters().ReadWord(14) == 2402);
Console.WriteLine("success!");
myTestComp.FileStreamClose();
}
//Method: RunTests
//Purpose: tests key methods in the CPU class
//Variables: myOptions - Options handle to options to class
public static void RunTests(Options myOptions)
{
myOptions.SetFileName("test1.exe");
Console.WriteLine("testing CPU...");
Computer myTestComp = new Computer(myOptions);
myTestComp.endRun += new Computer.EventHandler(delegate { });
myTestComp.putChar += new Computer.EventHandler(delegate { });
Console.WriteLine("testing Fetch, Decode, and Execute methods...");
//test MOV register
myTestComp.getRegisters().WriteWord(5, 0);
myTestComp.getRegisters().WriteWord(3, 4);
myTestComp.getCPU().Decode((uint)0xE1A05003); //mov r5, r3
myTestComp.getCPU().Execute(); //mov r5, r3
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 4);
//test MOV immediate
myTestComp.getCPU().Decode((uint)0xe3a02030); //mov r2, 48
myTestComp.getCPU().Execute(); //mov r2, 48
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 48);
Debug.Assert(myTestComp.getCPU().disassembly == "mov r2, #48");
//test MUL
myTestComp.getRegisters().WriteWord(4, 2);
myTestComp.getRegisters().WriteWord(2, 8);
myTestComp.getCPU().Decode((uint)0xE0020294); //mul r2, r4, r2
myTestComp.getCPU().Execute(); //mul r2, r4, r2
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 16);
//test SUB
myTestComp.getRegisters().WriteWord(4, 10);
myTestComp.getCPU().Decode((uint)0xE2445003); //sub r5, r4, #3
myTestComp.getCPU().Execute(); //sub r5, r4, #3
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 7);
//test RSB
myTestComp.getRegisters().WriteWord(4, 10);
myTestComp.getCPU().Decode((uint)0xE2645003); //rsb r5, r4, #3
myTestComp.getCPU().Execute(); //rsb r5, r4, #3
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 4294967289);
//test AND
myTestComp.getRegisters().WriteWord(0, 0xFFFF);
myTestComp.getCPU().Decode((uint)0xE20020FF); //and r2, r0, #255
myTestComp.getCPU().Execute(); //and r2, r0, #255
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 255);
//test ORR
myTestComp.getRegisters().WriteWord(0, 0);
myTestComp.getCPU().Decode((uint)0xE3802012); //orr r2, r0, #18
myTestComp.getCPU().Execute(); //orr r2, r0, #18
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 18);
//test EOR
myTestComp.getRegisters().WriteWord(0, 732);
myTestComp.getCPU().Decode((uint)0xE2202FB7); // eor r2, r0, #732
myTestComp.getCPU().Execute(); // eor r2, r0, #732
Debug.Assert(myTestComp.getRegisters().ReadWord(2) == 0);
//test LDR
//E5925000 (LDR r5, r2)
myTestComp.getRegisters().WriteWord(5, 11);
myTestComp.getMemory().WriteWord(1, 2462);
myTestComp.getRegisters().WriteWord(2, 1);
myTestComp.getCPU().Decode((uint)0xE5925000); //LDR r5, r2
myTestComp.getCPU().Execute(); //LDR r5, r2
Debug.Assert(myTestComp.getRegisters().ReadWord(5) == 2462);
//test STR
//E5821000 (STR r1, r2)
myTestComp.getRegisters().WriteWord(1, 2463);
myTestComp.getRegisters().WriteWord(2, 1);
myTestComp.getCPU().Decode((uint)0xE5821000); //STR r1, r2
myTestComp.getCPU().Execute(); //STR r1, r2
Debug.Assert(myTestComp.getMemory().ReadWord(1) == 2463);
//test LDM
//18914001 (ldm r1, {r0, r14} or something..)
//make r1 = memory address 1
myTestComp.getRegisters().WriteWord(1, 1);
myTestComp.getMemory().WriteWord(1, 2400);
myTestComp.getMemory().WriteWord(5, 2402);
//so r0 should be 2400 and r14 should be 2402
myTestComp.getCPU().Decode((uint)0x18914001); //ldm r1, {r1, r15} or something..
myTestComp.getCPU().Execute(); //ldm r1, {r1, r15} or something..
Debug.Assert(myTestComp.getRegisters().ReadWord(0) == 2400);
Debug.Assert(myTestComp.getRegisters().ReadWord(14) == 2402);
Console.WriteLine("success!");
myTestComp.FileStreamClose();
}