Amneesh Singh
8a04eade92
Instructions added Branch and Exchange (BX) Branch and Link (B) Multiply and Accumulate (MUL, MLA) Multiply Long and Accumulate (SMULL, SMLAL, UMULL, UMLAL) Single data swap (SWP) [WIP] Halfword Transfer (STRH, LDRH) Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
#include "bus.hh"
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#include "cpu/cpu.hh"
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#include "memory.hh"
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#include <array>
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#include <cstdlib>
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#include <fstream>
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#include <iostream>
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#include <memory>
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#include <vector>
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int
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main(int argc, const char* argv[]) {
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std::vector<uint8_t> rom;
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std::array<uint8_t, Memory::BIOS_SIZE> bios;
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auto usage = [argv]() {
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std::cerr << "Usage: " << argv[0] << " <file> [-b <bios>]" << std::endl;
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std::exit(EXIT_FAILURE);
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};
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if (argc < 2)
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usage();
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std::string rom_file, bios_file = "gba_bios.bin";
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for (int i = 1; i < argc; ++i) {
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std::string arg = argv[i];
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if (arg == "-b") {
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if (++i < argc)
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bios_file = argv[i];
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else
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usage();
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} else {
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rom_file = arg;
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}
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}
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if (rom_file.empty())
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usage();
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try {
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std::ifstream ifile(rom_file, std::ios::in | std::ios::binary);
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std::streampos bios_size;
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if (!ifile.is_open()) {
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throw std::ios::failure("File not found", std::error_code());
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}
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rom.assign(std::istreambuf_iterator<char>(ifile),
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std::istreambuf_iterator<char>());
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ifile.close();
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ifile.open(bios_file, std::ios::in | std::ios::binary);
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if (!ifile.is_open()) {
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throw std::ios::failure("BIOS file not found", std::error_code());
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}
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ifile.seekg(0, std::ios::end);
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bios_size = ifile.tellg();
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if (bios_size != Memory::BIOS_SIZE) {
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throw std::ios::failure("BIOS file has invalid size",
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std::error_code());
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}
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ifile.seekg(0, std::ios::beg);
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ifile.read(reinterpret_cast<char*>(bios.data()), bios.size());
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ifile.close();
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} catch (const std::exception& e) {
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std::cerr << "Exception: " << e.what() << std::endl;
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return 1;
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}
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{
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Memory memory(std::move(bios), std::move(rom));
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Bus bus(std::make_shared<Memory>(memory));
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Cpu cpu(std::make_shared<Bus>(bus));
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cpu.step();
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}
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return 0;
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}
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