Lecture Practice Quiz 19  

The assembly listing                      The C function

        .file   "quiz12.c"                int quiz12(int a, int b, int c) {
        .text                                 int x, y, z;
.globl quiz12                                 x = a - 20;
        .type   quiz12, @function             y = b + 30;
quiz12:                                       z = c - 40;
        pushl   %ebp                          return x + y + z;
        movl    %esp, %ebp                }
        subl    $16, %esp
        movl    8(%ebp), %eax
        subl    $20, %eax
        movl    %eax, -12(%ebp)
        movl    12(%ebp), %eax
        addl    $30, %eax
        movl    %eax, -8(%ebp)
        movl    16(%ebp), %eax
        subl    $40, %eax
        movl    %eax, -4(%ebp)
        movl    -8(%ebp), %eax
        movl    -12(%ebp), %edx
        leal    (%edx,%eax), %eax    # movl %ebp,%esp, then popl %ebp
        addl    -4(%ebp), %eax
        leave
        ret
        .size   quiz12, .-quiz12
        .ident  "GCC: (GNU) 4.4.4 20100630 (Red Hat 4.4.4-10)"
        .section        .note.GNU-stack,"",@progbits



1.  ____  16(%ebp)         A. return address

2.  ____  12(%ebp)         B. saved %ebp

3.  ____   8(%ebp)         C. a

4.  ____   4(%ebp)         D. b

5.  ____   0(%ebp)         E. c

6.  ____  -4(%ebp)         F. x

7.  ____  -8(%ebp)         G. y

8.  ____  -12(%ebp)        H. z

9.  ____  -16(%ebp)        I. not used