print-digit.asm

section .bss
    digitSpace resb 100
    digitSpacePos resb 8
 
section .data
    text db "Hello, World!",10,0
 
section .text
    global _start
 
_start:
    mov rax, 256
    call _printRAX

    ; sys_exit with 0 return code
    mov rax, 60
    mov rdi, 0
    syscall
  
_printRAX:
    mov rcx, digitSpace
    mov rbx, 10
    mov [rcx], rbx
    inc rcx
    mov [digitSpacePos], rcx
 
_printRAXLoop:
    mov rdx, 0
    mov rbx, 10
    div rbx
    push rax
    add rdx, 48
 
    mov rcx, [digitSpacePos]
    mov [rcx], dl
    inc rcx
    mov [digitSpacePos], rcx
    
    pop rax
    cmp rax, 0
    jne _printRAXLoop
 
_printRAXLoop2:
    mov rcx, [digitSpacePos]
 
    mov rax, 1
    mov rdi, 1
    mov rsi, rcx
    mov rdx, 1
    syscall
 
    mov rcx, [digitSpacePos]
    dec rcx
    mov [digitSpacePos], rcx
 
    cmp rcx, digitSpace
    jge _printRAXLoop2
 
    ret