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:

  lea rsi, [source]
  lea rdi, [dest]
  mov rcx, s_size
  
  .loop:

  mov al, [rsi + rcx]
  mov [rdi + rcx], al

  loop .loop

  mov rax, 60
  mov rdi, 0
  syscall