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48 lines
1.9 KiB
C++
48 lines
1.9 KiB
C++
//
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// 65816Base.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 28/09/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#include "../65816.hpp"
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using namespace CPU::WDC65816;
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uint16_t ProcessorBase::value_of(Register r) const {
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switch (r) {
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case Register::ProgramCounter: return registers_.pc;
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case Register::LastOperationAddress: return last_operation_pc_;
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case Register::StackPointer:
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return
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(registers_.s.full & (registers_.emulation_flag ? 0xff : 0xffff)) |
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(registers_.emulation_flag ? 0x100 : 0x000);
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case Register::Flags: return get_flags();
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case Register::A: return registers_.a.full;
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case Register::X: return registers_.x.full;
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case Register::Y: return registers_.y.full;
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case Register::EmulationFlag: return registers_.emulation_flag;
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case Register::DataBank: return registers_.data_bank >> 16;
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case Register::ProgramBank: return registers_.program_bank >> 16;
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case Register::Direct: return registers_.direct;
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default: return 0;
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}
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}
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void ProcessorBase::set_value_of(Register r, uint16_t value) {
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switch (r) {
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case Register::ProgramCounter: registers_.pc = value; break;
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case Register::StackPointer: registers_.s.full = value; break;
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case Register::Flags: set_flags(uint8_t(value)); break;
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case Register::A: registers_.a.full = value; break;
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case Register::X: registers_.x.full = value & registers_.x_mask; break;
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case Register::Y: registers_.y.full = value & registers_.x_mask; break;
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case Register::EmulationFlag: set_emulation_mode(value); break;
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case Register::DataBank: registers_.data_bank = uint32_t(value & 0xff) << 16; break;
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case Register::ProgramBank: registers_.program_bank = uint32_t(value &0xff) << 16; break;
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case Register::Direct: registers_.direct = value; break;
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default: break;
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}
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}
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