There are many great papers explaining Registers and I wish when I was studying this, somebody told me that Registers are just like variables.

I already have made a post about Calling Convention but this is for the basics posts.

Calling convention is how the function receives the parameters and how they return a result. This is important when solving pwnable CTF challenges because there’s a lot of situations where you have to use these features.

We are given a source code with this challenge.