2023_system_programming_hw3_in_ncku

This is the README file for the hw3 of the system programming courses in 2023, NCKU ---- an SIC/XE relocation loader.

This file is meant to demonstrate how the program main.c does and how to use it.

Prerequisites

Please ensure that you have gcc installed on you computer to compile this.

Consequence of usage of any other c compiler is unknown.

Also, notice that this file is developed on Ubuntu 20.04.

Get started

One can simply run

$ gcc main.c

to compile the file.

Usage

To use it, please prepare the input SIC/XE object file first.

An input example is given as input.txt file.

Run

$ ./a.out < ${input file path} > ${output file path (optional)}

to generate the corresponding memory image file based on random starting addresses.

For example,

$ ./a.out < input.txt > output.txt

This will read in the object code and relocate it into random one of the pages starting between 0x1230 ~ 0x6000.

The default page size used here is 64 bytes.

You can change all of the setting in the macro of main.c.

As for the output.txt example, one can load it into the memory with an SIC/XE simulator as shown in the following picture:

Moreover, one can run it:

It will copy the content of DEVF1 file and paste it to the DEV05 file just as what it was designed for.

NOTE: Altough the code is original, this input.txt example is from the page 65 of the book System Software: An Introduction to Systems Programming, 3/e by Leland L. Beck. It's not mine and used here only for demonstration.