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CLK/Processors/65816/Implementation/65816Base.cpp
Thomas Harte d3c7253981 Shifts size-limiting of X and Y to transitions and mutations, away from reads.
Primarily to remove potential bug-causing complexity — this is easier to debug. But let's see.
2020-11-04 20:35:41 -05:00

45 lines
1.8 KiB
C++

//
// 65816Base.cpp
// Clock Signal
//
// Created by Thomas Harte on 28/09/2020.
// Copyright © 2020 Thomas Harte. All rights reserved.
//
#include "../65816.hpp"
using namespace CPU::WDC65816;
uint16_t ProcessorBase::get_value_of_register(Register r) const {
switch (r) {
case Register::ProgramCounter: return registers_.pc;
case Register::LastOperationAddress: return last_operation_pc_;
case Register::StackPointer: return registers_.s.full & (registers_.emulation_flag ? 0xff : 0xffff);
case Register::Flags: return get_flags();
case Register::A: return registers_.a.full;
case Register::X: return registers_.x.full;
case Register::Y: return registers_.y.full;
case Register::EmulationFlag: return registers_.emulation_flag;
case Register::DataBank: return registers_.data_bank >> 16;
case Register::ProgramBank: return registers_.program_bank >> 16;
case Register::Direct: return registers_.direct;
default: return 0;
}
}
void ProcessorBase::set_value_of_register(Register r, uint16_t value) {
switch (r) {
case Register::ProgramCounter: registers_.pc = value; break;
case Register::StackPointer: registers_.s.full = value; break;
case Register::Flags: set_flags(uint8_t(value)); break;
case Register::A: registers_.a.full = value; break;
case Register::X: registers_.x.full = value & registers_.x_mask; break;
case Register::Y: registers_.y.full = value & registers_.x_mask; break;
case Register::EmulationFlag: set_emulation_mode(value); break;
case Register::DataBank: registers_.data_bank = uint32_t(value & 0xff) << 16; break;
case Register::ProgramBank: registers_.program_bank = uint32_t(value &0xff) << 16; break;
case Register::Direct: registers_.direct = value; break;
default: break;
}
}