x86-64 Assembly Journey

Entering the metal.

This repository documents my journey learning x86-64 Assembly from scratch — understanding how computers actually work beneath high-level languages.

Instead of relying on abstractions, this repo focuses on:

• raw Linux syscalls
• registers
• memory
• program flow
• CPU instructions
• low-level debugging
• ELF sections
• system architecture fundamentals

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Why?

I wanted to understand what really happens underneath languages like Python, JavaScript, and C.

Assembly strips programming down to its core:

• moving data
• manipulating memory
• making decisions
• communicating with the kernel

No frameworks. No runtime magic. Just the machine.

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Topics Covered

Basics

• Hello World
• Linux syscalls
• Registers
• Program entry points
• Exiting programs
• Calculator

Memory

• .text
• .data
• .bss
• Buffers
• Memory addressing

Logic

• Comparisons
• CPU flags
• Conditional jumps
• Labels
• Control flow
• itoa and atoi

Input / Output

• read
• write
• Terminal interaction

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Build & Run

Using GNU assembler (as) and linker (ld):

as program.s -o program.o
ld program.o -o program
./program

Using GCC instead of GNU assember

gcc -nostdlib -no-pie program.s -o program
./program