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Annotation of sys/lib/libkern/arch/sparc64/strlen.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: strlen.S,v 1.3 2003/06/02 23:28:09 millert Exp $      */
        !             2: /*     $NetBSD: strlen.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $       */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1992, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * This software was developed by the Computer Systems Engineering group
        !             9:  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
        !            10:  * contributed to Berkeley.
        !            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:  * Header: strlen.s,v 1.1 92/06/25 12:52:47 torek Exp
        !            37:  */
        !            38:
        !            39: #if defined(LIBC_SCCS) && !defined(lint)
        !            40: #ifdef notdef
        !            41:        .asciz "@(#)strlen.s    8.1 (Berkeley) 6/4/93"
        !            42: #endif
        !            43:        .asciz "$NetBSD: strlen.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $"
        !            44: #endif /* LIBC_SCCS and not lint */
        !            45:
        !            46: #include "DEFS.h"
        !            47:
        !            48: ENTRY(strlen)
        !            49:        add     %o0, 1, %o1     ! save starting point + 1
        !            50: 1:
        !            51:        ldsb    [%o0], %o2      ! fetch byte
        !            52:        tst     %o2             ! null?
        !            53:        bne     1b              ! no, keep going
        !            54:        inc     %o0             ! always increment pointer
        !            55:        retl
        !            56:        sub     %o0, %o1, %o0   ! return length (ptr - (origptr+1))