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sdivsi3.S revision 1.1 
      1 /*	$NetBSD: sdivsi3.S,v 1.1 1999/09/13 10:31:43 itojun 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: @(#)udivsi3.s	5.1 (Berkeley) 5/15/90
     39  */
     40 
     41 #include <machine/asm.h>
     42 #if defined(LIBC_SCCS)
     43 	RCSID("$NetBSD: sdivsi3.S,v 1.1 1999/09/13 10:31:43 itojun Exp $")
     44 #endif
     45 
     46 /* r0 <= r4 / r5 */
     47 ENTRY(__sdivsi3)
     48 	tst	r5, r5
     49 	bt	div_by_zero
     50 
     51 	mov	#0, r2
     52 	div0s	r2, r4
     53 	subc	r3, r3
     54 	subc	r2, r4
     55 	div0s	r5, r3
     56 #define DIVSTEP	rotcl r4; div1 r5, r3
     57 	/* repeat 32 times */
     58 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     59 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     60 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     61 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     62 #undef DIVSTEP
     63 	rotcl	r4
     64 	addc	r2, r4
     65 
     66 	rts
     67 	mov	r4, r0		/* delay slot */
     68 
     69 div_by_zero:
     70 #ifdef _KERNEL
     71 	rts
     72 	mov	#0, r0		/* delay slot */
     73 #else
     74 	mov.l	r14, @-r15
     75 	sts.l	pr, @-r15
     76 	mov	r15, r14
     77 
     78 	mov.l	L_raise, r1
     79 	jsr	@r1
     80 	mov	#8, r4		/* delay slot */
     81 	mov	#0, r0
     82 
     83 	lds.l	@r15+, pr
     84 	rts
     85 	mov.l	@r15+, r14	/* delay slot */
     86 
     87 	.align 2
     88 L_raise:
     89 	.long	_raise
     90 #endif
     91