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Annotation of sys/lib/libkern/arch/m68k/skpc.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: skpc.S,v 1.3 2003/06/02 23:28:08 millert Exp $        */
        !             2: /*     $NetBSD: skpc.S,v 1.2 1994/10/26 06:39:32 cgd Exp $     */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1988 University of Utah.
        !             6:  * Copyright (c) 1980, 1990 The Regents of the University of California.
        !             7:  * All rights reserved.
        !             8:  *
        !             9:  * This code is derived from software contributed to Berkeley by
        !            10:  * the Systems Programming Group of the University of Utah Computer
        !            11:  * Science Department.
        !            12:  *
        !            13:  * Redistribution and use in source and binary forms, with or without
        !            14:  * modification, are permitted provided that the following conditions
        !            15:  * are met:
        !            16:  * 1. Redistributions of source code must retain the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer.
        !            18:  * 2. Redistributions in binary form must reproduce the above copyright
        !            19:  *    notice, this list of conditions and the following disclaimer in the
        !            20:  *    documentation and/or other materials provided with the distribution.
        !            21:  * 3. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  *
        !            37:  *     from: Utah Hdr: locore.s 1.58 91/04/22
        !            38:  *     @(#)locore.s    7.11 (Berkeley) 5/9/91
        !            39:  */
        !            40:
        !            41: #include "DEFS.h"
        !            42:
        !            43: /*
        !            44:  * Emulate fancy VAX string operations:
        !            45:  *     skpc(mask, count, startc)
        !            46:  */
        !            47: ENTRY(skpc)
        !            48:        movl    sp@(8),d0       | get length
        !            49:        jeq     Lskdone         | nothing to do, return
        !            50:        movb    sp@(7),d1       | mask to use
        !            51:        movl    sp@(12),a0      | where to start
        !            52:        subqw   #1,d0           | adjust for dbcc
        !            53: Lskloop:
        !            54:        cmpb    a0@+,d1         | compate with mask
        !            55:        dbne    d0,Lskloop      | keep going til no more or zero
        !            56:        addqw   #1,d0           | overshot by one
        !            57: Lskdone:
        !            58:        rts