strcat_arm.S revision 1.5
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) 361.5Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 371.3Smatt .fnstart 381.3Smatt .cfi_startproc 391.3Smatt#endif 401.3Smatt push {r3-r5, lr} /* save registers */ 411.5Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 421.3Smatt .save {r3-r5, lr} 431.3Smatt .cfi_def_cfa_offset 16 441.3Smatt .cfi_offset 14, -4 451.3Smatt .cfi_offset 5, -8 461.3Smatt .cfi_offset 4, -12 471.3Smatt .cfi_offset 3, -16 481.3Smatt#endif 491.1Smatt 501.1Smatt mov r4, r0 /* save dst */ 511.1Smatt mov r5, r1 /* save append */ 521.1Smatt 531.1Smatt bl PLT_SYM(strlen) /* find length of dst */ 541.1Smatt 551.3Smatt adds r0, r0, r4 /* add to dst pointer */ 561.1Smatt mov r1, r5 /* fetch append */ 571.1Smatt bl PLT_SYM(strcpy) /* append string */ 581.1Smatt 591.1Smatt mov r0, r4 /* restore dst as return value */ 601.3Smatt pop {r3-r5, pc} /* restore registers */ 611.5Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 621.3Smatt .cfi_endproc 631.3Smatt .fnend 641.3Smatt#endif 651.1SmattEND(strcat) 66