global    _start

          section   .text
_start:  
          ; store a big number in the entire register
          mov       rax, 01111111111111111h 
          ; store a smaller number in the lower 1/2
          mov       eax, 022222222h
          ; store a smaller number in the lower 1/4
          mov       ax, 03333h
          ; store a small number in the lower 1/8
          mov       al, 044h

          mov       al, -1
          mov       rax, -1

          ; exit the program properly
          mov       rax, 60           ; system call for exit
          mov       rdi, 0            ; exit code 0
          syscall                     ; invoke operating system to exit