1*37c9f0a6Schristos/* $NetBSD: strlen.S,v 1.1 2005/12/20 19:28:50 christos Exp $ */ 2*37c9f0a6Schristos 3*37c9f0a6Schristos/* 4*37c9f0a6Schristos * Copyright (c) 1992, 1993 5*37c9f0a6Schristos * The Regents of the University of California. All rights reserved. 6*37c9f0a6Schristos * 7*37c9f0a6Schristos * This software was developed by the Computer Systems Engineering group 8*37c9f0a6Schristos * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9*37c9f0a6Schristos * contributed to Berkeley. 10*37c9f0a6Schristos * 11*37c9f0a6Schristos * Redistribution and use in source and binary forms, with or without 12*37c9f0a6Schristos * modification, are permitted provided that the following conditions 13*37c9f0a6Schristos * are met: 14*37c9f0a6Schristos * 1. Redistributions of source code must retain the above copyright 15*37c9f0a6Schristos * notice, this list of conditions and the following disclaimer. 16*37c9f0a6Schristos * 2. Redistributions in binary form must reproduce the above copyright 17*37c9f0a6Schristos * notice, this list of conditions and the following disclaimer in the 18*37c9f0a6Schristos * documentation and/or other materials provided with the distribution. 19*37c9f0a6Schristos * 3. Neither the name of the University nor the names of its contributors 20*37c9f0a6Schristos * may be used to endorse or promote products derived from this software 21*37c9f0a6Schristos * without specific prior written permission. 22*37c9f0a6Schristos * 23*37c9f0a6Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24*37c9f0a6Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25*37c9f0a6Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26*37c9f0a6Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27*37c9f0a6Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28*37c9f0a6Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29*37c9f0a6Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30*37c9f0a6Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31*37c9f0a6Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32*37c9f0a6Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33*37c9f0a6Schristos * SUCH DAMAGE. 34*37c9f0a6Schristos * 35*37c9f0a6Schristos * from: Header: strlen.s,v 1.1 92/06/25 12:52:47 torek Exp 36*37c9f0a6Schristos */ 37*37c9f0a6Schristos 38*37c9f0a6Schristos#include <machine/asm.h> 39*37c9f0a6Schristos#if defined(LIBC_SCCS) && !defined(lint) 40*37c9f0a6Schristos#if 0 41*37c9f0a6Schristos .asciz "@(#)strlen.s 8.1 (Berkeley) 6/4/93" 42*37c9f0a6Schristos#else 43*37c9f0a6Schristos RCSID("$NetBSD: strlen.S,v 1.1 2005/12/20 19:28:50 christos Exp $") 44*37c9f0a6Schristos#endif 45*37c9f0a6Schristos#endif /* LIBC_SCCS and not lint */ 46*37c9f0a6Schristos 47*37c9f0a6SchristosENTRY(strlen) 48*37c9f0a6Schristos add %o0, 1, %o1 ! save starting point + 1 49*37c9f0a6Schristos1: 50*37c9f0a6Schristos ldsb [%o0], %o2 ! fetch byte 51*37c9f0a6Schristos tst %o2 ! null? 52*37c9f0a6Schristos bne 1b ! no, keep going 53*37c9f0a6Schristos inc %o0 ! always increment pointer 54*37c9f0a6Schristos retl 55*37c9f0a6Schristos sub %o0, %o1, %o0 ! return length (ptr - (origptr+1)) 56