strcat_arm.S revision 1.1 
11.1Smatt/*-
21.1Smatt * Copyright (c) 2013 The NetBSD Foundation, Inc.
31.1Smatt * All rights reserved.
41.1Smatt *
51.1Smatt * This code is derived from software contributed to The NetBSD Foundation
61.1Smatt * by Matt Thomas of 3am Software Foundry.
71.1Smatt *
81.1Smatt * Redistribution and use in source and binary forms, with or without
91.1Smatt * modification, are permitted provided that the following conditions
101.1Smatt * are met:
111.1Smatt * 1. Redistributions of source code must retain the above copyright
121.1Smatt *    notice, this list of conditions and the following disclaimer.
131.1Smatt * 2. Redistributions in binary form must reproduce the above copyright
141.1Smatt *    notice, this list of conditions and the following disclaimer in the
151.1Smatt *    documentation and/or other materials provided with the distribution.
161.1Smatt *
171.1Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
181.1Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
191.1Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
201.1Smatt * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
211.1Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
221.1Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
231.1Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
241.1Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
251.1Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
261.1Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
271.1Smatt * POSSIBILITY OF SUCH DAMAGE.
281.1Smatt */
291.1Smatt
301.1Smatt#include <machine/asm.h>
311.1Smatt
321.1Smatt/*
331.1Smatt * Implementation of strcat using strlen/strcpy.
341.1Smatt */
351.1SmattENTRY(strcat)
361.1Smatt	str	lr, [sp, #-8]		/* save return address */
371.1Smatt	push	{r4, r5}		/* save registers */
381.1Smatt
391.1Smatt	mov	r4, r0			/* save dst */
401.1Smatt	mov	r5, r1			/* save append */
411.1Smatt
421.1Smatt	bl	PLT_SYM(strlen)		/* find length of dst */
431.1Smatt
441.1Smatt	add	r0, r0, r4		/* add to dst pointer */
451.1Smatt	mov	r1, r5			/* fetch append */
461.1Smatt	bl	PLT_SYM(strcpy)		/* append string */
471.1Smatt
481.1Smatt	mov	r0, r4			/* restore dst as return value */
491.1Smatt	pop	{r4, r5}		/* restore registers */
501.1Smatt	ldr	lr, [sp], #8		/* restore return address */
511.1Smatt	RET
521.1SmattEND(strcat)
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