1/* $NetBSD: strcat.S,v 1.1 2014/08/10 05:47:35 matt Exp $ */
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
33
34RCSID("$NetBSD: strcat.S,v 1.1 2014/08/10 05:47:35 matt Exp $")
35
36/*
37 * Implementation of strcat using strlen/strcpy.
38 */
39ENTRY(strcat)
40	stp	x29, x30, [sp, #-32]!	/* save fp, lr */
41	mov	x29, sp			/* init fp */
42	stp	x27, x28, [x29, #16]	/* save registers */
43
44	mov	x27, x0			/* save dst */
45	mov	x28, x1			/* save append */
46
47	bl	_C_LABEL(strlen)	/* find length of dst */
48
49	add	x0, x0, x27		/* add to dst pointer */
50	mov	x1, x28			/* fetch append */
51	bl	_C_LABEL(strcpy)	/* append string */
52
53	mov	x0, x27			/* restore dst as return value */
54	ldp	x27, x28, [x29, #16]	/* save registers */
55	ldp	x29, x30, [sp], #32	/* save fp, lr; pop stack */
56	ret
57END(strcat)
58