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 .text 16 .align 2 17 GCC_ASM_EXPORT (memmove) 18 19 # VOID 20 # EFIAPI 21 # memmove ( 22 # IN VOID *Destination, 23 # IN CONST VOID *Source, 24 # IN UINT32 Size 25 # ); 26 ASM_PFX(memmove): 27 CMP r2, #0 28 BXEQ lr 29 CMP r0, r1 30 BXEQ lr 31 BHI memmove_backward 32 33 memmove_forward: 34 LDRB r3, [r1], #1 35 STRB r3, [r0], #1 36 SUBS r2, r2, #1 37 BXEQ lr 38 B memmove_forward 39 40 memmove_backward: 41 add r0, r2 42 add r1, r2 43 memmove_backward_loop: 44 LDRB r3, [r1, #-1]! 45 STRB r3, [r0, #-1]! 46 SUBS r2, r2, #1 47 BXEQ lr 48 B memmove_backward_loop 49
