1/* 2 * Copyright (C) 2013 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17#include <linux/linkage.h> 18#include <asm/assembler.h> 19 20/* 21 * Move a buffer from src to test (alignment handled by the hardware). 22 * If dest <= src, call memcpy, otherwise copy in reverse order. 23 * 24 * Parameters: 25 * x0 - dest 26 * x1 - src 27 * x2 - n 28 * Returns: 29 * x0 - dest 30 */ 31ENTRY(memmove) 32 cmp x0, x1 33 b.ls memcpy 34 add x4, x0, x2 35 add x1, x1, x2 36 subs x2, x2, #8 37 b.mi 2f 381: ldr x3, [x1, #-8]! 39 subs x2, x2, #8 40 str x3, [x4, #-8]! 41 b.pl 1b 422: adds x2, x2, #4 43 b.mi 3f 44 ldr w3, [x1, #-4]! 45 sub x2, x2, #4 46 str w3, [x4, #-4]! 473: adds x2, x2, #2 48 b.mi 4f 49 ldrh w3, [x1, #-2]! 50 sub x2, x2, #2 51 strh w3, [x4, #-2]! 524: adds x2, x2, #1 53 b.mi 5f 54 ldrb w3, [x1, #-1] 55 strb w3, [x4, #-1] 565: ret 57ENDPROC(memmove) 58