1/*-
2 * Copyright (c) 2013 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Matt Thomas of 3am Software Foundry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <machine/asm.h>
31
32RCSID("$NetBSD: strlcat_arm.S,v 1.5 2013/09/05 05:15:47 matt Exp $")
33
34/* LINTSTUB: size_t strlcat(char *, const char *, size_t) */
35ENTRY(strlcat)
36#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
37# if !defined(__ARM_DWARF_EH__)
38	.fnstart
39# endif
40	.cfi_startproc
41#endif
42	push	{r4-r6, lr}
43#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
44# if !defined(__ARM_DWARF_EH__)
45	.save	{r4-r6, lr}
46# endif
47	.cfi_def_cfa_offset 16
48	.cfi_offset 14, -4
49	.cfi_offset 6, -8
50	.cfi_offset 5, -12
51	.cfi_offset 4, -16
52#endif
53	mov	r4, r0			/* save dst */
54	mov	r5, r1			/* save src */
55	mov	r6, r2			/* save siz */
56
57	mov	r1, r6			/* get siz */
58	bl	PLT_SYM(strnlen)	/* find length of dst (up to siz) */
59
60	subs	r2, r6, r0		/* get remaining space in dst */
61	mov	r1, r5			/* restore src */
62	mov	r5, r0			/* save remaining space */
63	adds	r0, r0, r4		/* set start to end of dst */
64	bl	PLT_SYM(strlcpy)	/* attempt to copy src */
65	adds	r0, r0, r5		/* add remaining to strlcpy return */
66	pop	{r4-r6, pc}		/* restore registers and return */
67#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
68	.cfi_endproc
69# if !defined(__ARM_DWARF_EH__)
70	.fnend
71# endif
72#endif
73END(strlcat)
74