; Hello World Program
; Compile with: nasm -f elf helloworld.asm
; Link with (64 bit systems require elf_i386 option): ld -m elf_i386 helloworld.o -o helloworld
; Run: ./helloworld
 
SECTION .data
msg     db      'Hello World!', 0Ah    ; assign msg variable with your message string
 
SECTION .text
global  _start
 
_start:
 
    mov     edx, 13    ; number of bytes to write - one for each letter plus 0Ah (line feed character)
    mov     ecx, msg   ; move the memory address of our message string into ecx
    mov     ebx, 1     ; write to the STDOUT file
    mov     eax, 4     ; invoke SYS_WRITE (kernel opcode 4)
    int     80h