1 .text
2 .p2align 2,0x90
3 .globl mpdigdiv
4 mpdigdiv:
5 	/* Prelude */
6 	pushl %ebp		/* save on stack */
7 	pushl %ebx
8 	
9 	leal 12(%esp), %ebp	/* %ebp = FP for now */
10 	movl 0(%ebp), %ebx	/* dividend */
11 	movl 0(%ebx), %eax
12 	movl 4(%ebx), %edx
13 	movl 4(%ebp), %ebx	/* divisor */
14 	movl 8(%ebp), %ebp	/* quotient */
15 
16 	xorl	%ecx, %ecx
17 	cmpl	%ebx, %edx		/* dividend >= 2^32 * divisor */
18 	jae	divovfl
19 	cmpl	%ecx, %ebx		/* divisor == 1 */
20 	je	divovfl
21 	divl	%ebx		/* AX = DX:AX/BX */
22 	movl	%eax, (%ebp)
23 done:
24 	/* Postlude */
25 	popl %ebx
26 	popl %ebp
27 	ret
28 
29 	/* return all 1's */
30 divovfl:
31 	notl	%ecx
32 	movl	%ecx, (%ebp)
33 	jmp done