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Annotation of sys/lib/libkern/arch/mips64/strlen.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: strlen.S,v 1.4 2004/10/08 14:42:09 pefo Exp $ */
                      2: /*-
                      3:  * Copyright (c) 1991, 1993
                      4:  *      The Regents of the University of California.  All rights reserved.
                      5:  *
                      6:  * This code is derived from software contributed to Berkeley by
                      7:  * Ralph Campbell.
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  */
                     33:
                     34: #include "DEFS.h"
                     35:
                     36: /*
                     37:  * strlen(str)
                     38:  */
                     39: LEAF(strlen, 0)
                     40:        .set    noreorder
                     41:        PTR_ADDU v1, a0, 1
                     42: 1:
                     43:        lb      v0, 0(a0)               # get byte from string
                     44:        PTR_ADDU a0, a0, 1              # increment pointer
                     45:        bne     v0, zero, 1b            # continue if not end
                     46:        nop
                     47:        j       ra
                     48:        PTR_SUBU v0, a0, v1             # compute length - 1 for '\0' char
                     49: END(strlen)