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Writing data.asm

Part of the Fundamentals section of Coddy's Assembly journey — lesson 44 of 45.

Challenge

Create a data.asm file for a program that prints Hello, World! followed by a newline.
You need:

A .data section
A string with label msg containing Hello, World! and a newline (0x0a)
A constant called msgLen that calculates the length automatically using $ - msg

Why this goes in a separate file:

Remember the two-file pattern from Chapter 0:

data.asm holds all data definitions
main.asm will include this file with %include "data.asm"

Try it yourself

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 ProgramWriting data.asm Project lesson

Project lesson

Writing main.asm

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