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 * Copy a buffer from src to dest (alignment handled by the hardware) 22 * 23 * Parameters: 24 * x0 - dest 25 * x1 - src 26 * x2 - n 27 * Returns: 28 * x0 - dest 29 */ 30 ENTRY(memcpy) 31 mov x4, x0 32 subs x2, x2, #8 33 b.mi 2f 34 1: ldr x3, [x1], #8 35 subs x2, x2, #8 36 str x3, [x4], #8 37 b.pl 1b 38 2: adds x2, x2, #4 39 b.mi 3f 40 ldr w3, [x1], #4 41 sub x2, x2, #4 42 str w3, [x4], #4 43 3: adds x2, x2, #2 44 b.mi 4f 45 ldrh w3, [x1], #2 46 sub x2, x2, #2 47 strh w3, [x4], #2 48 4: adds x2, x2, #1 49 b.mi 5f 50 ldrb w3, [x1] 51 strb w3, [x4] 52 5: ret 53 ENDPROC(memcpy) 54
