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76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
//
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// Created by anonymus-raccoon on 2/10/20.
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//
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#include "../CPU.hpp"
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namespace ComSquare::CPU
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{
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void CPU::RESB()
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{
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this->_registers.p.i = true;
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this->_registers.p.d = false;
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this->_isEmulationMode = true;
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this->_registers.p.m = true;
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this->_registers.p.x_b = true;
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this->_registers.dbr = 0x00;
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this->_registers.pbr = 0x00;
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this->_registers.d = 0x0000;
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this->_registers.sh = 0x01; // the low bit of the stack pointer is undefined on reset.
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this->_registers.pc = this->_cartridgeHeader.emulationInterrupts.reset;
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}
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void CPU::BRK()
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{
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if (this->_isEmulationMode) {
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this->_registers.pc += 2;
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this->_push(this->_registers.pc);
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this->_registers.p.x_b = true;
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this->_push(this->_registers.p.flags);
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this->_registers.p.i = true;
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this->_registers.p.d = false;
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this->_registers.pc = this->_cartridgeHeader.emulationInterrupts.brk;
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} else {
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this->_push(this->_registers.pbr);
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this->_registers.pc += 2;
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this->_push(this->_registers.pc);
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this->_push(this->_registers.p.flags);
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this->_registers.p.i = true;
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this->_registers.p.d = false;
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this->_registers.pbr = 0x0;
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this->_registers.pc = this->_cartridgeHeader.nativeInterrupts.brk;
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}
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}
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void CPU::COP()
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{
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if (this->_isEmulationMode) {
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this->_registers.pc += 2;
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this->_push(this->_registers.pc);
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this->_push(this->_registers.p.flags);
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this->_registers.p.i = true;
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this->_registers.p.d = false;
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this->_registers.pc = this->_cartridgeHeader.emulationInterrupts.cop;
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} else {
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this->_push(this->_registers.pbr);
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this->_registers.pc += 2;
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this->_push(this->_registers.pc);
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this->_push(this->_registers.p.flags);
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this->_registers.p.i = true;
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this->_registers.p.d = false;
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this->_registers.pbr = 0x0;
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this->_registers.pc = this->_cartridgeHeader.nativeInterrupts.cop;
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}
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}
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void CPU::RTI()
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{
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this->_registers.p.flags = this->_pop();
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this->_registers.pc = this->_pop16();
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if (!this->_isEmulationMode)
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this->_registers.pbr = this->_pop16();
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}
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} |