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sdivsi3.S revision 1.10 
      1 /*	$NetBSD: sdivsi3.S,v 1.10 2011/07/06 01:29:54 mrg 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: sdivsi3.S,v 1.10 2011/07/06 01:29:54 mrg Exp $")
     40 #endif
     41 
     42 
     43 #ifdef __ELF__
     44 	.hidden __sdivsi3
     45 #endif
     46 
     47 
     48 /* r0 <= r4 / r5 */
     49 WEAK_ALIAS(__sdivsi3_i4i,__sdivsi3)
     50 NENTRY(__sdivsi3)
     51 	mov	r4, r0
     52 	mov	r5, r1
     53 
     54 	tst	r1, r1
     55 	bt	div_by_zero
     56 
     57 	mov	#0, r2
     58 	div0s	r2, r0
     59 	subc	r3, r3
     60 	subc	r2, r0
     61 	div0s	r1, r3
     62 #define DIVSTEP	rotcl r0; div1 r1, r3
     63 	/* repeat 32 times */
     64 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     65 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     66 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     67 	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
     68 #undef DIVSTEP
     69 	rotcl	r0
     70 
     71 	rts
     72 	 addc	r2, r0
     73 
     74 div_by_zero:
     75 #ifdef _KERNEL
     76 	rts
     77 	 mov	#0, r0
     78 #else
     79 	mov.l	r14, @-r15
     80 	sts.l	pr, @-r15
     81 	mov	r15, r14
     82 
     83 	mov.l	L_raise, r1
     84 #ifdef PIC
     85 1:	bsrf	r1
     86 #else
     87 	jsr	@r1
     88 #endif
     89 	 mov	#8, r4		/* delay slot.  8 <- SIGFPE. */
     90 	mov	#0, r0
     91 
     92 	lds.l	@r15+, pr
     93 	rts
     94 	 mov.l	@r15+, r14
     95 
     96 	.align	2
     97 L_raise:
     98 #ifdef PIC
     99 	.long	_C_LABEL(raise)-(1b+4)
    100 #else
    101 	.long	_C_LABEL(raise)
    102 #endif
    103 #endif
    104