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