.global _start
.text
_start:
      movw  $0,%ax
      call  sub1
      call  sub2
      call  sub3
      nop

      movl  $1,%eax
      movl  $0,%ebx
      int   $0x80

sub1: addw  $1,%ax
sub2: addw  $2,%ax
sub3: addw  $3,%ax
      ret