better_tutorial

compared to the first tutorial I wrote, which was basically just notes.

Synopsis

This project is aimed at people who want to learn the NASM x86 Assembler and have no prior experience with it.

It's best to start with reading the notes to about the middle, then you can either start the lessons, have a go at programming with NASM yourself or continue reading the advanced notes.

Code Example

; Hello World Program

SECTION .data
msg     db      'Hello World!', 0Ah     ; assign msg variable with your message string

SECTION .text
 global  _start

_start:

mov   eax, 4    ; invoke SYS_WRITE (kernel opcode 4)
mov   ebx, 1    ; write to the STDOUT file
mov   ecx, msg  ; move the memory address of our message string into ecx
mov   edx, 13   ; number of bytes to write - one for each letter plus 0Ah (line feed character)
int   80h

mov   eax, 1    ; invoke SYS_EXIT (kernel OPCODE 1)
mov   ebx, 0    ; return 0 status on exit - 'No Errors'
int   80h

Motivation

I wanted to create this project because I wanted to learn Assembly and thought that if I write down notes in an orderly manner somebody else might benefit from this as well. (Mervs looking at you)

Installation

Just copy this project to your PC and start reading the notes. The easiest way to do this is with git:

git clone https://github.com/he-mat/better_tutorial.git

This command will download a directory called "better_tutorial" to your current directory. It is recommended that you start by reading the notes.TXT file, though you could directly start with the lessons.

If you want to compile and link your programs with ease, follow these steps:

• create the directory /bin/scripts
• copy both files compile and compile32 into the newly created directory
• add the directory to your PATH by adding the following lines add the bottom

if [ -d "/bin/scripts" ]; then
  PATH="$PATH:/bin/scripts/"
fi

• enter this to restart bash:

$ exec bash

• done!

Now you can use the two scripts from anywhere! Just enter compile -h for first time help.