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 32/* 33 * Implementation of strcat using strlen/strcpy. 34 */ 35ENTRY(strcat) 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 {r3-r5, lr} /* save registers */ 43#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 44# if !defined(__ARM_DWARF_EH__) 45 .save {r3-r5, lr} 46# endif 47 .cfi_def_cfa_offset 16 48 .cfi_offset 14, -4 49 .cfi_offset 5, -8 50 .cfi_offset 4, -12 51 .cfi_offset 3, -16 52#endif 53 54 mov r4, r0 /* save dst */ 55 mov r5, r1 /* save append */ 56 57 bl PLT_SYM(strlen) /* find length of dst */ 58 59 adds r0, r0, r4 /* add to dst pointer */ 60 mov r1, r5 /* fetch append */ 61 bl PLT_SYM(strcpy) /* append string */ 62 63 mov r0, r4 /* restore dst as return value */ 64 pop {r3-r5, pc} /* restore registers */ 65#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 66 .cfi_endproc 67# if !defined(__ARM_DWARF_EH__) 68 .fnend 69# endif 70#endif 71END(strcat) 72