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udivsi3.S revision 1.3 
      1 /*	$NetBSD: udivsi3.S,v 1.3 2003/08/07 16:32:19 agc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	from: @(#)udivsi3.s	5.1 (Berkeley) 5/15/90
     35  */
     36 
     37 #include <machine/asm.h>
     38 #if defined(LIBC_SCCS)
     39 	RCSID("$NetBSD: udivsi3.S,v 1.3 2003/08/07 16:32:19 agc Exp $")
     40 #endif
     41 
     42 /* r0 <= r4 / r5 */
     43 ENTRY(__udivsi3)
     44 	tst	r5, r5
     45 	bt	div_by_zero
     46 
     47 	mov	#0, r0
     48 	div0u
     49 #define DIVSTEP	rotcl r4; div1 r5, r0
     50 	/* repeat 32 times */
     51 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     52 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     53 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     54 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     55 #undef DIVSTEP
     56 	rotcl	r4
     57 
     58 	rts
     59 	mov	r4, r0		/* delay slot */
     60 
     61 div_by_zero:
     62 #if defined(_KERNEL) || defined(_STANDALONE)
     63 	rts
     64 	mov	#0, r0		/* delay slot */
     65 #else
     66 	mov.l	r14, @-r15
     67 	sts.l	pr, @-r15
     68 	mov	r15, r14
     69 
     70 	mov.l	L_raise, r1
     71 	jsr	@r1
     72 	mov	#8, r4		/* delay slot */
     73 	mov	#0, r0
     74 
     75 	lds.l	@r15+, pr
     76 	rts
     77 	mov.l	@r15+, r14	/* delay slot */
     78 
     79 	.align 2
     80 L_raise:
     81 	.long	_raise
     82 #endif
     83