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124 lines
4.1 KiB
C++
124 lines
4.1 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 03/05/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#include "StaticAnalyser.hpp"
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#include "../AppleII/Target.hpp"
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#include "../Oric/Target.hpp"
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#include "../Disassembler/6502.hpp"
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#include "../Disassembler/AddressMapper.hpp"
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#include "../../../Storage/Disk/Track/TrackSerialiser.hpp"
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#include "../../../Storage/Disk/Encodings/AppleGCR/SegmentParser.hpp"
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namespace {
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Analyser::Static::Target *AppleTarget(const Storage::Encodings::AppleGCR::Sector *sector_zero) {
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using Target = Analyser::Static::AppleII::Target;
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auto *const target = new Target;
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if(sector_zero && sector_zero->encoding == Storage::Encodings::AppleGCR::Sector::Encoding::FiveAndThree) {
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target->disk_controller = Target::DiskController::ThirteenSector;
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} else {
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target->disk_controller = Target::DiskController::SixteenSector;
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}
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return target;
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}
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Analyser::Static::Target *OricTarget(const Storage::Encodings::AppleGCR::Sector *sector_zero) {
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using Target = Analyser::Static::Oric::Target;
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auto *const target = new Target;
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target->rom = Target::ROM::Pravetz;
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target->disk_interface = Target::DiskInterface::Pravetz;
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target->loading_command = "CALL 800\n";
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return target;
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}
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}
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Analyser::Static::TargetList Analyser::Static::DiskII::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
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// This analyser can comprehend disks only.
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if(media.disks.empty()) return {};
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// Grab track 0, sector 0: the boot sector.
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const auto track_zero = media.disks.front()->get_track_at_position(Storage::Disk::Track::Address(0, Storage::Disk::HeadPosition(0)));
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const auto sector_map = Storage::Encodings::AppleGCR::sectors_from_segment(
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Storage::Disk::track_serialisation(*track_zero, Storage::Time(1, 50000)));
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const Storage::Encodings::AppleGCR::Sector *sector_zero = nullptr;
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for(const auto &pair: sector_map) {
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if(!pair.second.address.sector) {
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sector_zero = &pair.second;
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break;
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}
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}
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// If there's no boot sector then if there are also no sectors at all,
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// decline to nominate a machine. Otherwise go with an Apple as the default.
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TargetList targets;
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if(!sector_zero) {
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if(sector_map.empty()) {
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return targets;
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} else {
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targets.push_back(std::unique_ptr<Analyser::Static::Target>(AppleTarget(nullptr)));
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targets.back()->media = media;
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return targets;
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}
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}
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// If the boot sector looks like it's intended for the Oric, create an Oric.
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// Otherwise go with the Apple II.
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const auto disassembly = Analyser::Static::MOS6502::Disassemble(sector_zero->data, Analyser::Static::Disassembler::OffsetMapper(0xb800), {0xb800});
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bool did_read_shift_register = false;
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bool is_oric = false;
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// Look for a tight BPL loop reading the Oric's shift register address of 0x31c. The Apple II just has RAM there,
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// so the probability of such a loop is infinitesimal.
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for(const auto &instruction: disassembly.instructions_by_address) {
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// Is this a read of the shift register?
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if(
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(
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(instruction.second.operation == Analyser::Static::MOS6502::Instruction::LDA) ||
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(instruction.second.operation == Analyser::Static::MOS6502::Instruction::LDX) ||
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(instruction.second.operation == Analyser::Static::MOS6502::Instruction::LDY)
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) &&
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instruction.second.addressing_mode == Analyser::Static::MOS6502::Instruction::Absolute &&
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instruction.second.address == 0x031c) {
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did_read_shift_register = true;
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continue;
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}
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if(did_read_shift_register) {
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if(
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instruction.second.operation == Analyser::Static::MOS6502::Instruction::BPL &&
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instruction.second.address == 0xfb) {
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is_oric = true;
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break;
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}
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did_read_shift_register = false;
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}
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}
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// Check also for calls into the 0x3xx page above 0x320, as that's where the Oric's boot ROM is.
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for(const auto address: disassembly.outward_calls) {
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is_oric |= address >= 0x320 && address < 0x400;
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}
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if(is_oric) {
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targets.push_back(std::unique_ptr<Analyser::Static::Target>(OricTarget(sector_zero)));
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} else {
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targets.push_back(std::unique_ptr<Analyser::Static::Target>(AppleTarget(sector_zero)));
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}
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targets.back()->media = media;
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return targets;
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}
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