asmtutorials/hello32.s

    ;; Hello World Program #1
    ;; Compile with: nasm -f elf hello.s
    ;; Link with: ld -m elf_i386 -o hello hello.o
    ;; Run with: ./hello

    ;; sys/unistd_32.h
%define     SYS_write	4
%define     SYS_exit	1

    ;; unistd.h
%define STDOUT		1

section .data
    msg     db  "Hello You Beautiful Human", 0Ah
    len     equ $-msg           ; NASM-supplied macro
    
section .text    
    global _start

_start:
    mov     edx, len
    mov     ecx, msg            ; Address of the message (not the content)
    mov     ebx, STDOUT         ; using STDOUT (see definition above)
    mov     eax, SYS_write      ; Using WRITE in 32-bit mode?
    int     80h                 ; Interrupt target. The 'h' means 'hexidecimal'

    mov     ebx, 0
    mov     eax, SYS_exit
    int     80h