x86_64 Linux assmbely(nasm) example for printing Hello World.

hello.asm

; Thanks for:
; https://p403n1x87.github.io/getting-started-with-x86-64-assembly-on-linux.html

global _start

SYS_WRITE   equ 1
SYS_EXIT    equ 60
STDOUT      equ 1

SECTION .data
hello           db  "Hello, World.", 10
hello_len       equ $-hello

SECTION .text

_start:
    mov     rax, SYS_WRITE
    mov     rdi, STDOUT
    mov     rsi, hello
    mov     rdx, hello_len
    syscall
    push    rax

    mov     rax, SYS_EXIT
    pop     rdi
    sub     rdi, hello_len
    syscall