mirror of https://github.com/TomHarte/CLK.git
95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
//
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// 6502.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 10/11/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include <cstdint>
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#include <functional>
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#include <map>
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#include <memory>
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#include <set>
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#include <vector>
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namespace Analyser::Static::MOS6502 {
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/*!
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Describes a 6502 instruciton: its address, the operation it performs, its addressing mode
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and its operand, if any.
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*/
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struct Instruction {
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/*! The address this instruction starts at. This is a mapped address. */
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uint16_t address = 0;
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/*! The operation this instruction performs. */
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enum {
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BRK, JSR, RTI, RTS, JMP,
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CLC, SEC, CLD, SED, CLI, SEI, CLV,
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NOP,
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SLO, RLA, SRE, RRA, ALR, ARR,
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SAX, LAX, DCP, ISC,
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ANC, XAA, AXS,
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AND, EOR, ORA, BIT,
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ADC, SBC,
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AHX, SHY, SHX, TAS, LAS,
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LDA, STA, LDX, STX, LDY, STY,
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BPL, BMI, BVC, BVS, BCC, BCS, BNE, BEQ,
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CMP, CPX, CPY,
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INC, DEC, DEX, DEY, INX, INY,
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ASL, ROL, LSR, ROR,
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TAX, TXA, TAY, TYA, TSX, TXS,
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PLA, PHA, PLP, PHP,
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KIL
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} operation = NOP;
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/*! The addressing mode used by the instruction. */
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enum {
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Absolute,
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AbsoluteX,
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AbsoluteY,
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Immediate,
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Implied,
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ZeroPage,
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ZeroPageX,
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ZeroPageY,
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Indirect,
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IndexedIndirectX,
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IndirectIndexedY,
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Relative,
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} addressing_mode = Implied;
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/*! The instruction's operand, if any. */
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uint16_t operand = 0;
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};
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/*! Represents the disassembled form of a program. */
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struct Disassembly {
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/*! All instructions found, mapped by address. */
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std::map<uint16_t, Instruction> instructions_by_address;
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/*! The set of all calls or jumps that land outside of the area covered by the data provided for disassembly. */
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std::set<uint16_t> outward_calls;
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/*! The set of all calls or jumps that land inside of the area covered by the data provided for disassembly. */
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std::set<uint16_t> internal_calls;
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/*! The sets of all stores, loads and modifies that occur to data outside of the area covered by the data provided for disassembly. */
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std::set<uint16_t> external_stores, external_loads, external_modifies;
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/*! The sets of all stores, loads and modifies that occur to data inside of the area covered by the data provided for disassembly. */
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std::set<uint16_t> internal_stores, internal_loads, internal_modifies;
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};
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/*!
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Disassembles the data provided as @c memory, mapping it into the 6502's full address range via the @c address_mapper,
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starting disassembly from each of the @c entry_points.
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*/
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Disassembly Disassemble(
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const std::vector<uint8_t> &memory,
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const std::function<std::size_t(uint16_t)> &address_mapper,
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std::vector<uint16_t> entry_points);
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}
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