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Writing main.asm

Part of the Fundamentals section of Coddy's Assembly journey — lesson 45 of 45.

Challenge

Create a main.asm file that:

Includes data.asm using %include
Has the .text section and global _start
Uses the write syscall to print the message
Uses the exit syscall to exit cleanly with code 0

Try it yourself

section .data
    msg db 'Hello, World!', 0x0a
    msgLen equ $ - msg

All lessons in Fundamentals

1The Machine

What is CPU Memory Registers vs Memory How instructions work Two-File Pattern The x86-64 Architecture

4Data Definition

The .data Section db - Define Byte dw - Define Word dd - Define Double Word dq - Define Quad Word Strings with db The $ Symbol Recap: Build data.asm

7Hello World

Planning the Program Writing data.asm

Project lesson

Writing main.asm Project lesson

Project lesson

2Number Systems

Why Binary?Binary Numbers Decimal to Binary Why Hexadecimal?Hex to Decimal Decimal to Hex ASCII & Hex

5Exit Syscall

What is Syscall?Exit Syscall (60)Exit Codes Recap: Clean Exit

3First instruction - MOV

What is MOV?MOV Immediate MOV Register to Register MOV Memory to Register MOV Register to Memory LEA - Load Address MOV with Different Sizes Practice: Swap Registers Recap: MOV Challenge

6Write Syscall

Write Syscall (1)File Descriptor (rdi)Buffer Address (rsi)Byte Count (rdx)Putting It Together Printing Two Strings Newline Matters Recap: Write Setup