1/*	$NetBSD: skpc.S,v 1.6.26.1 2013/07/23 21:07:36 riastradh Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1980, 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	from: Utah Hdr: locore.s 1.58 91/04/22
37 *	@(#)locore.s	7.11 (Berkeley) 5/9/91
38 */
39
40#include "DEFS.h"
41
42/*
43 * Emulate fancy VAX string operations:
44 *	skpc(mask, count, startc)
45 */
46ENTRY(skpc)
47	movl	8(%sp),%d0	| get length
48	jeq	Lskdone		| nothing to do, return
49	movb	7(%sp),%d1	| mask to use
50	movl	12(%sp),%a0	| where to start
51#ifndef __mcoldfire__
52	subqw	#1,%d0		| adjust for dbcc
53#endif
54Lskloop:
55	cmpb	(%a0)+,%d1	| compare with mask
56#ifdef __mcoldfire__
57	jne	Lskdone		| keep going til no more or zero
58	subql	#1,%d0
59	jne	Lskloop
60#else
61	dbne	%d0,Lskloop	| keep going til no more or zero
62	addqw	#1,%d0		| overshot by one
63#endif
64Lskdone:
65	rts
66