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Annotation of sys/lib/libkern/arch/sh/sdivsi3.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $NetBSD: sdivsi3.S,v 1.8 2006/05/22 20:56:44 uwe 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:
                     39: /* r0 <= r4 / r5 */
                     40: NENTRY(__sdivsi3)
                     41:        mov     r4, r0
                     42:        mov     r5, r1
                     43:
                     44:        tst     r1, r1
                     45:        bt      div_by_zero
                     46:
                     47:        mov     #0, r2
                     48:        div0s   r2, r0
                     49:        subc    r3, r3
                     50:        subc    r2, r0
                     51:        div0s   r1, r3
                     52: #define DIVSTEP        rotcl r0; div1 r1, r3
                     53:        /* repeat 32 times */
                     54:        DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
                     55:        DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
                     56:        DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
                     57:        DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
                     58: #undef DIVSTEP
                     59:        rotcl   r0
                     60:
                     61:        rts
                     62:         addc   r2, r0
                     63:
                     64: div_by_zero:
                     65: #ifdef _KERNEL
                     66:        rts
                     67:         mov    #0, r0
                     68: #else
                     69:        mov.l   r14, @-r15
                     70:        sts.l   pr, @-r15
                     71:        mov     r15, r14
                     72:
                     73:        mov.l   L_raise, r1
                     74: #ifdef PIC
                     75: 1:     bsrf    r1
                     76: #else
                     77:        jsr     @r1
                     78: #endif
                     79:         mov    #8, r4          /* delay slot.  8 <- SIGFPE. */
                     80:        mov     #0, r0
                     81:
                     82:        lds.l   @r15+, pr
                     83:        rts
                     84:         mov.l  @r15+, r14
                     85:
                     86:        .align  2
                     87: L_raise:
                     88: #ifdef PIC
                     89:        .long   _C_LABEL(raise)-(1b+4)
                     90: #else
                     91:        .long   _C_LABEL(raise)
                     92: #endif
                     93: #endif