section .text:
  global _start

_start:
hex2ascii:
  ; prelude
  push    ebp
  mov     ebp, esp

  ; stack: [ arg | return address | saved ebp ]
  ;           ^ ebp + 8  ^ ebp + 4    ^ ebp
  mov     eax, [ebp+8]    ; fetch argument from stack
  cmp     eax, 0xA
  jge     AthruF
  add     eax, '0'
  jmp     done
AthruF:
  sub     eax, 0xA
  add     eax, 'A'
done:
  leave
  ret                     ; return result in eax

printShort:
  ; prelude
  push  ebp
  mov   ebp, esp

  sub   esp, 8            ; make space for char ascii[] with word alignment
  mov   [ebp-8], byte '\n'; ascii[4] = '\n'

  ; stack: [ arg | return address | saved ebp | 3 padding bytes | ascii[] ]
  ;                                   ^ ebp
  mov   edx, [ebp+8]      ; load argument into edx
  and   edx, 0x0f         ; data & 0x0F
  push  edx
  call  hex2ascii
  pop   edx
  mov   [ebp-7], byte eax ; ascii[3] = hex2ascii(data & 0x0f)
  shr   edx, 4            ; data >>= 4




exit:
  mov     eax, 1
  int     80h