hello.asm

; ********************************************************************************
; "Hello, World!" Program
; ********************************************************************************


section .data
    sMsg db "Hello, world!", 0xA   ; message with newline character
    lMsg equ $-sMsg                ; length of the message

section .text
    global _start

_start:
    ; write the message to stdout
    mov eax, 4          ; system call for write
    mov ebx, 1          ; file descriptor for stdout
    mov ecx, msg        ; pointer to message to write
    mov edx, len        ; length of message
    int 0x80            ; invoke the system call

    ; exit with success status
    mov eax, 1          ; system call for exit
    xor ebx, ebx        ; exit status of 0
    int 0x80            ; invoke the system call