1/* 2 * Copyright (c) 2015 ARM Ltd 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the company may not be used to endorse or promote 14 * products derived from this software without specific prior written 15 * permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 22 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 .thumb 30 .syntax unified 31 .global __aeabi_memmove 32 .type __aeabi_memmove, %function 33 ASM_ALIAS __aeabi_memmove4 __aeabi_memmove 34 ASM_ALIAS __aeabi_memmove8 __aeabi_memmove 35__aeabi_memmove: 36 cmp r0, r1 37 push {r4} 38 bls 3f 39 adds r3, r1, r2 40 cmp r0, r3 41 bcs 3f 42 adds r1, r0, r2 43 cbz r2, 2f 44 subs r2, r3, r2 451: 46 ldrb r4, [r3, #-1]! 47 cmp r2, r3 48 strb r4, [r1, #-1]! 49 bne 1b 502: 51 pop {r4} 52 bx lr 533: 54 cmp r2, #0 55 beq 2b 56 add r2, r2, r1 57 subs r3, r0, #1 584: 59 ldrb r4, [r1], #1 60 cmp r2, r1 61 strb r4, [r3, #1]! 62 bne 4b 63 pop {r4} 64 bx lr 65 .size __aeabi_memmove, . - __aeabi_memmove 66