EightBit/M6502/inc/Disassembly.h
Adrian.Conlon c472d70c5c Ensure the MOS6502 unit tests run successfully to completion.
Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
2017-09-07 00:58:56 +01:00

328 lines
7.1 KiB
C++

#pragma once
#include <map>
#include <cstdint>
#include "mos6502.h"
#include "Symbols.h"
namespace EightBit {
class Disassembly {
public:
Disassembly(MOS6502& processor, const Symbols& symbols);
std::string dump_Flags(uint8_t value) const;
std::string dump_ByteValue(uint8_t value) const;
std::string dump_WordValue(uint16_t value) const;
std::string disassemble(uint16_t current) const;
private:
MOS6502& processor;
const Symbols& symbols;
mutable uint16_t m_address;
std::string disassemble_Implied(const std::string& instruction) const {
return "\t" + instruction;
}
std::string disassemble_Absolute(const std::string& instruction) const {
return AM_Absolute_dump() + "\t" + instruction + " " + AM_Absolute();
}
std::string disassemble_Indirect(const std::string& instruction) const {
return AM_Absolute_dump() + "\t" + instruction + " (" + AM_Absolute() + ")";
}
std::string disassemble_Relative(const std::string& instruction, uint16_t address) const {
return AM_Immediate_dump() + "\t" + instruction + " $" + dump_WordValue(address);
}
std::string disassemble_AM_00(int bbb, const std::string& instruction) const {
return AM_00_dump(bbb) + "\t" + instruction + " " + AM_00(bbb);
}
std::string disassemble_AM_01(int bbb, const std::string& instruction) const {
return AM_01_dump(bbb) + "\t" + instruction + " " + AM_01(bbb);
}
std::string disassemble_AM_10(int bbb, const std::string& instruction) const {
return AM_10_dump(bbb) + "\t" + instruction + " " + AM_10(bbb);
}
std::string disassemble_AM_10_x(int bbb, const std::string& instruction) const {
return AM_10_x_dump(bbb) + "\t" + instruction + " " + AM_10_x(bbb);
}
#pragma region 6502 addressing modes
#pragma region References
std::string AM_Immediate_dump() const {
return dump_Byte(m_address + 1);
}
std::string AM_Immediate() const {
return "#" + AM_Immediate_dump();
}
std::string AM_Absolute_dump() const {
return dump_DByte(m_address + 1);
}
std::string AM_Absolute() const {
return "$" + dump_WordValue(processor.BUS().peekWord(m_address + 1));
}
std::string AM_ZeroPage_dump() const {
return dump_Byte(m_address + 1);
}
std::string AM_ZeroPage() const {
return "$" + dump_Byte(m_address + 1);
}
std::string AM_ZeroPageX_dump() const {
return AM_ZeroPage_dump();
}
std::string AM_ZeroPageX() const {
return AM_ZeroPage() + ",X";
}
std::string AM_ZeroPageY_dump() const {
return AM_ZeroPage_dump();
}
std::string AM_ZeroPageY() const {
return AM_ZeroPage() + ",Y";
}
std::string AM_AbsoluteX_dump() const {
return AM_Absolute_dump();
}
std::string AM_AbsoluteX() const {
return AM_Absolute() + ",X";
}
std::string AM_AbsoluteY_dump() const {
return AM_Absolute_dump();
}
std::string AM_AbsoluteY() const {
return AM_Absolute() + ",Y";
}
std::string AM_IndexedIndirectX_dump() const {
return AM_ZeroPage_dump();
}
std::string AM_IndexedIndirectX() const {
return "($" + dump_Byte(m_address + 1) + ",X)";
}
std::string AM_IndirectIndexedY_dump() const {
return AM_ZeroPage_dump();
}
std::string AM_IndirectIndexedY() const {
return "($" + dump_Byte(m_address + 1) + "),Y";
}
#pragma endregion References
#pragma region 6502 addressing mode switching
std::string AM_00_dump(int bbb) const {
switch (bbb) {
case 0b000:
return AM_Immediate_dump();
case 0b001:
return AM_ZeroPage_dump();
case 0b011:
return AM_Absolute_dump();
case 0b101:
return AM_ZeroPageX_dump();
case 0b111:
return AM_AbsoluteX_dump();
case 0b010:
case 0b100:
case 0b110:
throw std::domain_error("Illegal addressing mode");
default:
__assume(0);
}
}
std::string AM_00(int bbb) const {
switch (bbb) {
case 0b000:
return AM_Immediate();
case 0b001:
return AM_ZeroPage();
case 0b011:
return AM_Absolute();
case 0b101:
return AM_ZeroPageX();
case 0b111:
return AM_AbsoluteX();
case 0b010:
case 0b100:
case 0b110:
throw std::domain_error("Illegal addressing mode");
default:
__assume(0);
}
}
std::string AM_01_dump(int bbb) const {
switch (bbb) {
case 0b000:
return AM_IndexedIndirectX_dump();
case 0b001:
return AM_ZeroPage_dump();
case 0b010:
return AM_Immediate_dump();
case 0b011:
return AM_Absolute_dump();
case 0b100:
return AM_IndirectIndexedY_dump();
case 0b101:
return AM_ZeroPageX_dump();
case 0b110:
return AM_AbsoluteY_dump();
case 0b111:
return AM_AbsoluteX_dump();
default:
__assume(0);
}
}
std::string AM_01(int bbb) const {
switch (bbb) {
case 0b000:
return AM_IndexedIndirectX();
case 0b001:
return AM_ZeroPage();
case 0b010:
return AM_Immediate();
case 0b011:
return AM_Absolute();
case 0b100:
return AM_IndirectIndexedY();
case 0b101:
return AM_ZeroPageX();
case 0b110:
return AM_AbsoluteY();
case 0b111:
return AM_AbsoluteX();
default:
__assume(0);
}
}
std::string AM_10_dump(int bbb) const {
switch (bbb) {
case 0b000:
return AM_Immediate_dump();
case 0b001:
return AM_ZeroPage_dump();
case 0b010:
return "";
case 0b011:
return AM_Absolute_dump();
case 0b101:
return AM_ZeroPageX_dump();
case 0b111:
return AM_AbsoluteX_dump();
case 0b100:
case 0b110:
throw std::domain_error("Illegal addressing mode");
default:
__assume(0);
}
}
std::string AM_10(int bbb) const {
switch (bbb) {
case 0b000:
return AM_Immediate();
case 0b001:
return AM_ZeroPage();
case 0b010:
return "A";
case 0b011:
return AM_Absolute();
case 0b101:
return AM_ZeroPageX();
case 0b111:
return AM_AbsoluteX();
case 0b100:
case 0b110:
throw std::domain_error("Illegal addressing mode");
default:
__assume(0);
}
}
std::string AM_10_x_dump(int bbb) const {
switch (bbb) {
case 0b000:
return AM_Immediate_dump();
case 0b001:
return AM_ZeroPage_dump();
case 0b010:
return "";
case 0b011:
return AM_Absolute_dump();
case 0b101:
return AM_ZeroPageY_dump();
case 0b111:
return AM_AbsoluteY_dump();
case 0b100:
case 0b110:
throw std::domain_error("Illegal addressing mode");
default:
__assume(0);
}
}
std::string AM_10_x(int bbb) const {
switch (bbb) {
case 0b000:
return AM_Immediate();
case 0b001:
return AM_ZeroPage();
case 0b010:
return "A";
case 0b011:
return AM_Absolute();
case 0b101:
return AM_ZeroPageY();
case 0b111:
return AM_AbsoluteY();
case 0b100:
case 0b110:
throw std::domain_error("Illegal addressing mode");
default:
__assume(0);
}
}
#pragma endregion 6502 addressing mode switching
#pragma endregion 6502 addressing modes
uint8_t getByte(uint16_t address) const;
std::string dump_Byte(uint16_t address) const;
std::string dump_DByte(uint16_t address) const;
std::string convertAddress(uint16_t address) const;
std::string convertAddress(uint8_t address) const;
std::string convertConstant(uint16_t constant) const;
std::string convertConstant(uint8_t constant) const;
};
}