minix/common/lib/libc/arch/arm/string/strcat_arm.S

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/*-
* Copyright (c) 2013 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>
/*
* Implementation of strcat using strlen/strcpy.
*/
ENTRY(strcat)
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
.fnstart
.cfi_startproc
#endif
push {r3-r5, lr} /* save registers */
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
.save {r3-r5, lr}
.cfi_def_cfa_offset 16
.cfi_offset 14, -4
.cfi_offset 5, -8
.cfi_offset 4, -12
.cfi_offset 3, -16
#endif
mov r4, r0 /* save dst */
mov r5, r1 /* save append */
bl PLT_SYM(strlen) /* find length of dst */
adds r0, r0, r4 /* add to dst pointer */
mov r1, r5 /* fetch append */
bl PLT_SYM(strcpy) /* append string */
mov r0, r4 /* restore dst as return value */
pop {r3-r5, pc} /* restore registers */
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
.cfi_endproc
.fnend
#endif
END(strcat)