/*      $NetBSD: skpc.S,v 1.10 2014/03/18 18:20:43 riastradh Exp $      */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1980, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: Utah Hdr: locore.s 1.58 91/04/22
 *      @(#)locore.s    7.11 (Berkeley) 5/9/91
 */

#include "DEFS.h"

/*
 * Emulate fancy VAX string operations:
 *      skpc(mask, count, startc)
 */
ENTRY(skpc)
        movl    8(%sp),%d0      | get length
        jeq     Lskdone         | nothing to do, return
        movb    7(%sp),%d1      | mask to use
        movl    12(%sp),%a0     | where to start
#ifndef __mcoldfire__
        subqw   #1,%d0          | adjust for dbcc
#endif
Lskloop:
        cmpb    (%a0)+,%d1      | compare with mask
#ifdef __mcoldfire__
        jne     Lskdone         | keep going til no more or zero
        subql   #1,%d0
        jne     Lskloop
#else
        dbne    %d0,Lskloop     | keep going til no more or zero
        addqw   #1,%d0          | overshot by one
#endif
Lskdone:
        rts