Annotation of sys/lib/libkern/arch/m68k/skpc.S, Revision 1.1.1.1
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
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