main.cpp

/*
RISC-V.cpp : Main entry point for the RISC-V emulator
This file contains the 'main' function which initializes the
DRAM memory and the Machine (CPU) and starts the emulator.
The program currently initializes 1 MiB of RAM and a Machine
with registers and a program counter set to the entry point.


Sources used for help:
****Mashayekhi, F. (n.d.). RISC-V Emulator in C.
Retrieved July 2025,
from https://fmash16.github.io/content/posts/riscv-emulator-in-c.html

**** "ELF loader part 1: ELF reader." 
Retrieved July 2025.
from https://0xc0ffee.netlify.app/osdev/21-elf-loader-p1#elf-reader.

***** "CHIP-8 Emulator." Austin Morlan, Retrieved August 2025.
from https://austinmorlan.com/posts/chip8_emulator/ 
*Helped me created the instruction table. 




Author: Quanayzia Garden
Date: 8-2025
Course: COSC530
Part5 Execute*/


#include <iostream>
#include <fstream>
#include "DRAM.h"
#include "Machine.h"

//#define DUMPFILE

int main(int argc, char* argv[])
{
    if (argc < 2) {
        std::cerr << "Usage: " << argv[0] << " <input.elf>\n";
        return 1;
    }

    std::string elfPath = argv[1];

#ifdef DUMPFILE
    if (argc < 3) {
        std::cerr << "Usage: " << argv[0] << " <input.elf> <output.dump>\n";
        return 1;
    }
    std::string dumpPath = argv[2];
#endif

    try {
        // 1 MiB RAM uninitialized
        DRAM memory;

        // Initialize Machine
        Machine cpu(memory);
        cpu.loadProgram(elfPath);

#ifdef DUMPFILE
        // Dump memory to binary file
        std::ofstream out(dumpPath, std::ios::binary);
        if (!out) {
            throw std::runtime_error("Failed to open output dump file.");
        }
        cpu.dumpMemory(out);

        std::cout << "Memory dumped to: " << dumpPath << "\n";
#endif
        //Emulation loop.

        while (true) {
            cpu.fetch(); 
            cpu.decode();
            cpu.execute();
        
        
        }
    }
    catch (const std::exception& e) {
        std::cerr << "ERROR: " << e.what() << "\n";
        return 1;
    }

    return 0;
}