Learn x86 Assembly with me

What's up.

Based off of my posts, I think it might be kind of strange to see an article like this

But yeah, I've decided to learn assembly

Also - Correct me if I'm wrong somewhere here or oversimplified a term. I'd be more than happy to read such comments and get my knowledge and understanding to the higher level

Why Assembly and why x86?

Starting with the second part - that's what my processors architecture is.

I don't have ARM processor, yet someone would tell me.

Just buy used computer or VPS with such access

I could, of course - Yet I would not like to spend too much money right now

I believe, that with some curiosity and time to search, I can dig information for free - This will be the challenge itself

I like challenges - so why not?

And why assembly? Simple answer...

Reverse Engineering

Just got into it - so Assembly might be fairly useful there, as not always everything can be found with C# or even C de-compiler

Where I'll be learning from?

I've found 2 decent sources

• tutorialspoint - in english, with nice segments and everything
• This paper from Jagiellonian University - yet in polish, so my native language

But, that's it for the talking - let's learn something

What does assembly code consist of

If we look at assembly code - it consists of sections

Some basic ones are

1. .bss - In this section, we declare variables, that will be changed while execution
2. .data - it stores constants, like strings or ints
3. .text - contains the code itself. We need to also declare _start here

section.text
    global .start
_start:

_start tells the kernel, where should it look for the beginning of the code.

In there, we can find mnemonics - Assembly instructions

In one line, there can only be one mnemonic

So, this

MOV TOTAL, 48 ADD TOTAL, 10

Can never appear - so we need to write this in 2 separate lines

MOV TOTAL, 48 ; Move 48 to variable in memory called TOTAL
ADD TOTAL, 10

As you see, I've also added ; to the end - that's comment in assembly

That's it, not to much yet still I hope it will expand very soon

What will I learn now?

Probably start reading about registers and other parts such as variables or conditional instructions

Right now, I'd like to thank you for reading - Share you expirance in comments. Maybe we as community can learn a very valuable lessons from you.

Also, feel free to share your sources - where have you been learning assembly from and that's it

See you next time