global _start
extern ExitProcess

section .data
section .text

factorial:  push ebp
            mov ebp,esp

  my_loop:  mov ebx,eax
            dec ebx
            mul ebx
            cmp ebx,1
            jne my_loop

            mov  esp,ebp     ; stack-frame leave (obnoveni ESP)
            pop  ebp         ; stack-frame leave (obnoveni EBP)
ret

_subfact:   push ebp
            mov ebp,esp

            mov eax,[ebp+8]
            call factorial
            mov ebx,eax
            mov eax,[ebp+12]
            call factorial
            sub eax,ebx

            mov  esp,ebp     ; stack-frame leave (obnoveni ESP)
            pop  ebp         ; stack-frame leave (obnoveni EBP)
            push eax
            push ebx
ret

_start:
            push dword 5
            push dword 7
            call _subfact

end:

        ;
        ; VOID WINAPI ExitProcess( _In_  UINT uExitCode ) ;
        ;
        push    dword 0         ; Arg1: push exit code
        call    ExitProcess