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225 lines
8.5 KiB
C++
225 lines
8.5 KiB
C++
//
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// StaticAnalyser.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 25/11/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#include "StaticAnalyser.hpp"
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#include "Cartridge.hpp"
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#include "Tape.hpp"
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#include "Target.hpp"
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#include "../Disassembler/Z80.hpp"
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#include "../Disassembler/AddressMapper.hpp"
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#include <algorithm>
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static std::unique_ptr<Analyser::Static::Target> CartridgeTarget(
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const Storage::Cartridge::Cartridge::Segment &segment,
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uint16_t start_address,
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Analyser::Static::MSX::Cartridge::Type type,
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float confidence) {
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// Size down to a multiple of 8kb in size and apply the start address.
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std::vector<Storage::Cartridge::Cartridge::Segment> output_segments;
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if(segment.data.size() & 0x1fff) {
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std::vector<uint8_t> truncated_data;
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std::vector<uint8_t>::difference_type truncated_size = std::vector<uint8_t>::difference_type(segment.data.size()) & ~0x1fff;
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truncated_data.insert(truncated_data.begin(), segment.data.begin(), segment.data.begin() + truncated_size);
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output_segments.emplace_back(start_address, truncated_data);
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} else {
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output_segments.emplace_back(start_address, segment.data);
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}
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auto target = std::make_unique<Analyser::Static::MSX::Target>();
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target->confidence = confidence;
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// Observation: all ROMs of 48kb or less are from the MSX 1 era.
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if(segment.data.size() < 48*1024) {
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target->model = Analyser::Static::MSX::Target::Model::MSX1;
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}
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if(type == Analyser::Static::MSX::Cartridge::Type::None) {
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target->media.cartridges.emplace_back(new Storage::Cartridge::Cartridge(output_segments));
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} else {
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target->media.cartridges.emplace_back(new Analyser::Static::MSX::Cartridge(output_segments, type));
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}
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return target;
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}
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/*
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Expected standard cartridge format:
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DEFB "AB" ; expansion ROM header
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DEFW initcode ; start of the init code, 0 if no initcode
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DEFW callstat; pointer to CALL statement handler, 0 if no such handler
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DEFW device; pointer to expansion device handler, 0 if no such handler
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DEFW basic ; pointer to the start of a tokenized basicprogram, 0 if no basicprogram
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DEFS 6,0 ; room reserved for future extensions
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MSX cartridges often include banking hardware; those games were marketed as MegaROMs. The file
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format that the MSX community has decided upon doesn't retain the type of hardware included, so
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this analyser has to guess.
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(additional audio hardware is also sometimes included, but it's implied by the banking hardware)
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*/
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static Analyser::Static::TargetList CartridgeTargetsFrom(
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const std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges) {
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// No cartridges implies no targets.
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if(cartridges.empty()) {
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return {};
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}
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Analyser::Static::TargetList targets;
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for(const auto &cartridge : cartridges) {
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const auto &segments = cartridge->get_segments();
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// Only one mapped item is allowed.
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if(segments.size() != 1) continue;
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// Which must be no more than 63 bytes larger than a multiple of 8 kb in size.
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Storage::Cartridge::Cartridge::Segment segment = segments.front();
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const size_t data_size = segment.data.size();
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if(data_size < 0x2000 || (data_size & 0x1fff) > 64) continue;
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// Check for a ROM header at address 0; if it's not found then try 0x4000
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// and adjust the start address;
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uint16_t start_address = 0;
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bool found_start = false;
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if(segment.data[0] == 0x41 && segment.data[1] == 0x42) {
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start_address = 0x4000;
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found_start = true;
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} else if(segment.data.size() >= 0x8000 && segment.data[0x4000] == 0x41 && segment.data[0x4001] == 0x42) {
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start_address = 0;
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found_start = true;
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}
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// Reject cartridge if the ROM header wasn't found.
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if(!found_start) continue;
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uint16_t init_address = uint16_t(segment.data[2] | (segment.data[3] << 8));
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// TODO: check for a rational init address?
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// If this ROM is less than 48kb in size then it's an ordinary ROM. Just emplace it and move on.
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// Bonus observation: all such ROMs are from the MSX 1 era.
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if(data_size <= 0xc000) {
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targets.emplace_back(CartridgeTarget(segment, start_address, Analyser::Static::MSX::Cartridge::Type::None, 1.0));
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continue;
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}
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// If this ROM is greater than 48kb in size then some sort of MegaROM scheme must
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// be at play; disassemble to try to figure it out.
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std::vector<uint8_t> first_8k;
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first_8k.insert(first_8k.begin(), segment.data.begin(), segment.data.begin() + 8192);
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const Analyser::Static::Z80::Disassembly disassembly =
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Analyser::Static::Z80::Disassemble(
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first_8k,
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Analyser::Static::Disassembler::OffsetMapper(start_address),
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{ init_address },
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Analyser::Static::Z80::Approach::Exhaustive
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);
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using Instruction = Analyser::Static::Z80::Instruction;
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const std::map<uint16_t, Instruction> &instructions = disassembly.instructions_by_address;
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// Look for LD (nnnn), A instructions, and collate those addresses.
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std::map<uint16_t, int> address_counts;
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for(const auto &instruction_pair : instructions) {
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if( instruction_pair.second.operation == Instruction::Operation::LD &&
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instruction_pair.second.destination == Instruction::Location::Operand_Indirect &&
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instruction_pair.second.source == Instruction::Location::A) {
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address_counts[uint16_t(instruction_pair.second.operand)]++;
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}
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}
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// Weight confidences by number of observed hits; if any is above 60% confidence, just use it.
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const auto ascii_8kb_total = address_counts[0x6000] + address_counts[0x6800] + address_counts[0x7000] + address_counts[0x7800];
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const auto ascii_16kb_total = address_counts[0x6000] + address_counts[0x7000] + address_counts[0x77ff];
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const auto konami_total = address_counts[0x6000] + address_counts[0x8000] + address_counts[0xa000];
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const auto konami_with_scc_total = address_counts[0x5000] + address_counts[0x7000] + address_counts[0x9000] + address_counts[0xb000];
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const auto total_hits = ascii_8kb_total + ascii_16kb_total + konami_total + konami_with_scc_total;
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const bool is_ascii_8kb = (ascii_8kb_total * 5) / (total_hits * 3);
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const bool is_ascii_16kb = (ascii_16kb_total * 5) / (total_hits * 3);
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const bool is_konami = (konami_total * 5) / (total_hits * 3);
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const bool is_konami_with_scc = (konami_with_scc_total * 5) / (total_hits * 3);
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if(!is_ascii_16kb && !is_konami && !is_konami_with_scc) {
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targets.push_back(CartridgeTarget(
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segment,
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start_address,
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Analyser::Static::MSX::Cartridge::ASCII8kb,
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float(ascii_8kb_total) / float(total_hits)));
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}
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if(!is_ascii_8kb && !is_konami && !is_konami_with_scc) {
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targets.push_back(CartridgeTarget(
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segment,
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start_address,
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Analyser::Static::MSX::Cartridge::ASCII16kb,
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float(ascii_16kb_total) / float(total_hits)));
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}
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if(!is_ascii_8kb && !is_ascii_16kb && !is_konami_with_scc) {
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targets.push_back(CartridgeTarget(
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segment,
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start_address,
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Analyser::Static::MSX::Cartridge::Konami,
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float(konami_total) / float(total_hits)));
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}
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if(!is_ascii_8kb && !is_ascii_16kb && !is_konami) {
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targets.push_back(CartridgeTarget(
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segment,
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start_address,
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Analyser::Static::MSX::Cartridge::KonamiWithSCC,
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float(konami_with_scc_total) / float(total_hits)));
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}
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}
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return targets;
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}
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Analyser::Static::TargetList Analyser::Static::MSX::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
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TargetList destination;
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// Append targets for any cartridges that look correct.
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auto cartridge_targets = CartridgeTargetsFrom(media.cartridges);
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std::move(cartridge_targets.begin(), cartridge_targets.end(), std::back_inserter(destination));
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// Consider building a target for disks and/or tapes.
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auto target = std::make_unique<Target>();
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// Check tapes for loadable files.
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for(auto &tape : media.tapes) {
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std::vector<File> files_on_tape = GetFiles(tape);
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if(!files_on_tape.empty()) {
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switch(files_on_tape.front().type) {
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case File::Type::ASCII: target->loading_command = "RUN\"CAS:\r"; break;
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case File::Type::TokenisedBASIC: target->loading_command = "CLOAD\rRUN\r"; break;
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case File::Type::Binary: target->loading_command = "BLOAD\"CAS:\",R\r"; break;
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default: break;
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}
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target->media.tapes.push_back(tape);
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}
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}
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// Region selection: for now, this as simple as:
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// "If a tape is involved, be European. Otherwise be American (i.e. English, but 60Hz)".
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target->region = target->media.tapes.empty() ? Target::Region::USA : Target::Region::Europe;
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// Blindly accept disks for now.
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// TODO: how to spot an MSX disk?
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target->media.disks = media.disks;
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target->has_disk_drive = !media.disks.empty();
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if(!target->media.empty()) {
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target->confidence = 0.5;
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destination.push_back(std::move(target));
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}
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return destination;
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}
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