| /* |
| * Copyright (C) 2013 ARM Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| /* |
| * Move a buffer from src to test (alignment handled by the hardware). |
| * If dest <= src, call memcpy, otherwise copy in reverse order. |
| * |
| * Parameters: |
| * x0 - dest |
| * x1 - src |
| * x2 - n |
| * Returns: |
| * x0 - dest |
| */ |
| ENTRY(memmove) |
| cmp x0, x1 |
| b.ls memcpy |
| add x4, x0, x2 |
| add x1, x1, x2 |
| subs x2, x2, #8 |
| b.mi 2f |
| 1: ldr x3, [x1, #-8]! |
| subs x2, x2, #8 |
| str x3, [x4, #-8]! |
| b.pl 1b |
| 2: adds x2, x2, #4 |
| b.mi 3f |
| ldr w3, [x1, #-4]! |
| sub x2, x2, #4 |
| str w3, [x4, #-4]! |
| 3: adds x2, x2, #2 |
| b.mi 4f |
| ldrh w3, [x1, #-2]! |
| sub x2, x2, #2 |
| strh w3, [x4, #-2]! |
| 4: adds x2, x2, #1 |
| b.mi 5f |
| ldrb w3, [x1, #-1] |
| strb w3, [x4, #-1] |
| 5: ret |
| ENDPROC(memmove) |
