1 /* $NetBSD: str.S,v 1.1.20.3 2004/09/21 13:23:40 skrll Exp $ */
3 * Copyright (c) 1996 Ludd, University of Lule}, Sweden.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed at Ludd, University of
17 * Lule}, Sweden and its contributors.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 * Small versions of the most common functions not using any
35 * emulated instructions.
41 * atoi() used in devopen.
59 * strchr() small and easy.
71 * cmpc3 is emulated on MVII.
79 2: cmpb (%r2)+, (%r1)+
90 * movc can't do length in excess of 64K, so we shall not use them.
100 * memcpy and bcopy are the same, except for argument order. Silly stuff.
114 2: movb -(%r0),-(%r1)
117 3: movb (%r0)+,(%r1)+
124 1: movb 8(%ap),(%r0)+
142 movl $250, %r3 # max string len to compare
148 bneq 1f # something differ
150 beql 4f # continue, strings unequal
151 decl %r3 # max string len encountered?
154 4: clrl %r0 # We are done, strings equal.
167 1: movb (%r2)+, (%r1)+
178 calls $1,_C_LABEL(strlen)
181 1: movb (%r1)+,(%r0)+
190 addl3 %fp,$28,12(%r0)