.data           /* секция кода программы */
        A:  .long 0
        B:  .long 0
        C:  .long 0
        D:  .long 0
        R:  .long 0
        .global A, B, C, D, R
        .text
        .global process
process:

        movl    (A), %ebx
        movl    (B), %esi
        movl    (C), %edi
        movl    (D), %ebp

        movl    %ebx, %eax
        imull   %esi

        movl    %eax, %ebx

        movl    %edi, %eax
        imull   %ebp

        subl    %eax, %ebx

        movl    %ebx, (R)

        movl    (R), %eax

        call    finish  /* вызываем подпрограмму finish: exit(0) */