private void SetLblTexts(Instruction instr)
{
obsTest.ChangeText("" + cpu.stepNum, "stepNumLbl");
obsTest.ChangeText(instr.disasm.instrCode, "instrTextLbl");
obsTest.ChangeText(instr.disasm.instruction + " " + instr.disasm.value, "disassemblyLbl");
// fetch next instruction
uint data = cpu.Fetch();
Instruction i = cpu.Decode(data);
uint val = registers.ReadWord((uint)regs.PC);
registers.WriteWord((uint)regs.PC, val - 4); // reset PC
obsTest.ChangeText(i.disasm.instrCode, "nextInstrLbl");
obsTest.ChangeText(i.disasm.instruction + " " + i.disasm.value, "nextDisasmLbl");
}
//--------------------------------------------------------------
// 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
}
}