nasm syscall

;64 bit
;nasm -f elf64 main.asm -o main.o
;ld main.o -o test

section .data
    msg: db "Hello World !", 10
    msgLen: equ $-msg

section .text
global _start

_start:
    mov rax, 1      ; sys_write
    mov rdi, 1      ; write to stdout
    mov rsi, msg    ; string address
    mov rdx, msgLen ; size of string
    syscall         ; syscall

    mov rax, 60     ; sys_exit
    mov rdi, 0      ; return code 0
    syscall         ; syscall