mirror of
https://github.com/zoriya/ComSquare.git
synced 2025-12-19 13:45:11 +00:00
38 lines
1.0 KiB
C++
38 lines
1.0 KiB
C++
//
|
|
// Created by anonymus-raccoon on 2/10/20.
|
|
//
|
|
|
|
#include "../CPU.hpp"
|
|
|
|
namespace ComSquare::CPU
|
|
{
|
|
unsigned CPU::RESB()
|
|
{
|
|
this->_registers.p.i = true;
|
|
this->_registers.p.d = false;
|
|
this->_isEmulationMode = true;
|
|
this->_registers.p.m = true;
|
|
this->_registers.p.x_b = true;
|
|
this->_registers.dbr = 0x00;
|
|
this->_registers.pbr = 0x00;
|
|
this->_registers.d = 0x0000;
|
|
this->_registers.sh = 0x01; // the low bit of the stack pointer is undefined on reset.
|
|
this->_registers.pc = this->_cartridgeHeader.emulationInterrupts.reset;
|
|
return 0;
|
|
}
|
|
|
|
unsigned CPU::BRK()
|
|
{
|
|
// TODO rework this. The PC should be pushed to the stack.
|
|
// Info here: http://softpixel.com/~cwright/sianse/docs/65816NFO.HTM at BRK Software Break
|
|
this->_registers.pc += 2;
|
|
|
|
this->_registers.p.i = true;
|
|
if (this->_isEmulationMode)
|
|
this->_registers.pc = this->_cartridgeHeader.emulationInterrupts.brk;
|
|
else
|
|
this->_registers.pc = this->_cartridgeHeader.nativeInterrupts.brk;
|
|
this->_registers.p.d = false;
|
|
return !this->_isEmulationMode;
|
|
}
|
|
} |