1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2011-2014, ARM Limited. All rights reserved. 4 # 5 # This program and the accompanying materials 6 # are licensed and made available under the terms and conditions of the BSD License 7 # which accompanies this distribution. The full text of the license may be found at 8 # http://opensource.org/licenses/bsd-license.php 9 # 10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 # 13 #------------------------------------------------------------------------------ 14 15 #include <AsmMacroIoLib.h> 16 17 # VOID 18 # EFIAPI 19 # memmove ( 20 # IN VOID *Destination, 21 # IN CONST VOID *Source, 22 # IN UINT32 Size 23 # ); 24 ASM_FUNC(memmove) 25 CMP r2, #0 26 BXEQ lr 27 CMP r0, r1 28 BXEQ lr 29 BHI memmove_backward 30 31 memmove_forward: 32 LDRB r3, [r1], #1 33 STRB r3, [r0], #1 34 SUBS r2, r2, #1 35 BXEQ lr 36 B memmove_forward 37 38 memmove_backward: 39 add r0, r2 40 add r1, r2 41 memmove_backward_loop: 42 LDRB r3, [r1, #-1]! 43 STRB r3, [r0, #-1]! 44 SUBS r2, r2, #1 45 BXEQ lr 46 B memmove_backward_loop 47
