global _start

section .data
  source: db 1, 2, 3, 4, 5, 6, 7, 8
  s_size equ $-source

section .bss

  dest: resb 8

section .text

_start:

  mov rsi, source
  mov rdi, dest
  mov rcx, s_size
  
  .loop:
  rep movsb
  loop .loop

  mov rax, 60
  mov rdi, 0
  syscall