strlcat_arm.S revision 1.3
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 321.3SmattRCSID("$NetBSD: strlcat_arm.S,v 1.3 2013/08/19 06:11:20 matt Exp $") 331.1Smatt 341.1Smatt/* LINTSTUB: size_t strlcat(char *, const char *, size_t) */ 351.1SmattENTRY(strlcat) 361.2Smatt#ifdef __ARM_EABI__ 371.2Smatt .fnstart 381.2Smatt .cfi_startproc 391.2Smatt#endif 401.1Smatt push {r4-r6, lr} 411.2Smatt#ifdef __ARM_EABI__ 421.2Smatt .save {r4-r6, lr} 431.2Smatt .cfi_def_cfa_offset 16 441.3Smatt .cfi_offset 14, -4 451.3Smatt .cfi_offset 6, -8 461.3Smatt .cfi_offset 5, -12 471.3Smatt .cfi_offset 4, -16 481.2Smatt#endif 491.1Smatt mov r4, r0 /* save dst */ 501.1Smatt mov r5, r1 /* save src */ 511.1Smatt mov r6, r2 /* save siz */ 521.1Smatt 531.1Smatt mov r1, r6 /* get siz */ 541.1Smatt bl PLT_SYM(strnlen) /* find length of dst (up to siz) */ 551.1Smatt 561.2Smatt subs r2, r6, r0 /* get remaining space in dst */ 571.1Smatt mov r1, r5 /* restore src */ 581.1Smatt mov r5, r0 /* save remaining space */ 591.2Smatt adds r0, r0, r4 /* set start to end of dst */ 601.1Smatt bl PLT_SYM(strlcpy) /* attempt to copy src */ 611.2Smatt adds r0, r0, r5 /* add remaining to strlcpy return */ 621.2Smatt pop {r4-r6, pc} /* restore registers and return */ 631.2Smatt#ifdef __ARM_EABI__ 641.2Smatt .cfi_endproc 651.2Smatt .fnend 661.2Smatt#endif 671.1SmattEND(strlcat) 68