/* $NetBSD: strcat.S,v 1.1 2014/08/10 05:47:35 matt Exp $ */

/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <machine/asm.h>

RCSID("$NetBSD: strcat.S,v 1.1 2014/08/10 05:47:35 matt Exp $")

/*
* Implementation of strcat using strlen/strcpy.
*/
ENTRY(strcat)
       stp     x29, x30, [sp, #-32]!   /* save fp, lr */
       mov     x29, sp                 /* init fp */
       stp     x27, x28, [x29, #16]    /* save registers */

       mov     x27, x0                 /* save dst */
       mov     x28, x1                 /* save append */

       bl      _C_LABEL(strlen)        /* find length of dst */

       add     x0, x0, x27             /* add to dst pointer */
       mov     x1, x28                 /* fetch append */
       bl      _C_LABEL(strcpy)        /* append string */

       mov     x0, x27                 /* restore dst as return value */
       ldp     x27, x28, [x29, #16]    /* save registers */
       ldp     x29, x30, [sp], #32     /* save fp, lr; pop stack */
       ret
END(strcat)