%macro print_ 1
    mov eax, 4
    mov ebx, 1
    mov ecx, %1
 
    call print
%endmacro
 
%macro exit_ 1
    mov eax, 1
    mov ebx, %1
    int 80h
%endmacro
 
SECTION .data
    hello:
        db "Hello World!",0x0A,0       
 
SECTION .text
    global _start
 
    _start:
        print_ hello
        exit_ 0
 
    ;print code called by print_ macro
    print:
        push ecx
        count:
            inc ecx
            cmp byte [ecx], 0
            jne count
 
        mov edx, ecx
        pop ecx
        sub edx, ecx
 
        int 80h
    ret
 

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