| #------------------------------------------------------------------------------ | |
| # | |
| # Copyright (c) 2011-2014, ARM Limited. All rights reserved. | |
| # | |
| # SPDX-License-Identifier: BSD-2-Clause-Patent | |
| # | |
| #------------------------------------------------------------------------------ | |
| #include <AsmMacroLib.h> | |
| # VOID | |
| # EFIAPI | |
| # memmove ( | |
| # IN VOID *Destination, | |
| # IN CONST VOID *Source, | |
| # IN UINT32 Size | |
| # ); | |
| ASM_FUNC(memmove) | |
| CMP r2, #0 | |
| BXEQ lr | |
| CMP r0, r1 | |
| BXEQ lr | |
| BHI memmove_backward | |
| memmove_forward: | |
| LDRB r3, [r1], #1 | |
| STRB r3, [r0], #1 | |
| SUBS r2, r2, #1 | |
| BXEQ lr | |
| B memmove_forward | |
| memmove_backward: | |
| add r0, r2 | |
| add r1, r2 | |
| memmove_backward_loop: | |
| LDRB r3, [r1, #-1]! | |
| STRB r3, [r0, #-1]! | |
| SUBS r2, r2, #1 | |
| BXEQ lr | |
| B memmove_backward_loop |