div_small.s

LINUX 1.0 内核c源代码

	.file	"div_small.S"
/*---------------------------------------------------------------------------+
 |  div_small.S                                                              |
 |                                                                           |
 | Divide a 64 bit integer by a 32 bit integer & return remainder.           |
 |                                                                           |
 | Copyright (C) 1992    W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
 |                       Australia.  E-mail   [e-mail]    |
 |                                                                           |
 |                                                                           |
 +---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------+
 |    unsigned long div_small(unsigned long long *x, unsigned long y)        |
 +---------------------------------------------------------------------------*/

#include "fpu_asm.h"

.text
	.align 2,144

.globl _div_small

_div_small:
	pushl	%ebp
	movl	%esp,%ebp

	pushl	%esi

	movl	PARAM1,%esi	/* pointer to num */
	movl	PARAM2,%ecx	/* The denominator */

	movl	4(%esi),%eax	/* Get the current num msw */
	xorl	%edx,%edx
	divl	%ecx

	movl	%eax,4(%esi)

	movl	(%esi),%eax	/* Get the num lsw */
	divl	%ecx

	movl	%eax,(%esi)

	movl	%edx,%eax	/* Return the remainder in eax */

	popl	%esi

	leave
	ret