void CPU::ExecuteOneInstruction()
{
switch (current_state_)
{
case State::Running:
previous_pc_ = registers_.pc;
ExecuteInstruction(FetchByte());
break;
case State::Halted:
// NOP instructions are executed until Halted state ends
NotifyMachineCycleLapse();
break;
case State::HaltBug:
// PC increment is skipped once when fetching the next opcode (no extra cycles are lapsed)
current_state_ = State::Running;
previous_pc_ = registers_.pc;
ExecuteInstruction(mmu_->ReadByte(registers_.pc));
break;
case State::Stopped:
//TODO check for joypad input, since that is the only thing that can finish Stopped state
return;
}
CheckInterrupts();
}
void Debugger::Run() {
pc_modified_ = false;
while (pc_ != kEndOfSimAddress) {
if (pending_request()) RunDebuggerShell();
ExecuteInstruction();
}
}
void Step()
{
DSPCore_CheckExceptions();
g_dsp.step_counter++;
#if PROFILE
g_dsp.err_pc = g_dsp.pc;
ProfilerAddDelta(g_dsp.err_pc, 1);
if (g_dsp.step_counter == 1)
{
ProfilerInit();
}
if ((g_dsp.step_counter & 0xFFFFF) == 0)
{
ProfilerDump(g_dsp.step_counter);
}
#endif
u16 opc = dsp_fetch_code();
ExecuteInstruction(UDSPInstruction(opc));
if (DSPAnalyzer::code_flags[g_dsp.pc - 1] & DSPAnalyzer::CODE_LOOP_END)
HandleLoop();
}
void GBStackBrain::ThinkOne(GBRobot * robot, GBWorld * world) {
GBStackInstruction ins = spec->ReadInstruction(pc++);
remaining --; // currently all instructions take one cycle
used ++;
ExecuteInstruction(ins, robot, world);
}
GekkoF GekkoCPU::execStep()
{
ExecuteInstruction();
}
