hackedteam/vector-edk

//------------------------------------------------------------------------------ 
//
// Copyright (c) 2011, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution.  The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
//------------------------------------------------------------------------------


    EXPORT  __aeabi_memmove

    AREA    Memmove, CODE, READONLY

;
;VOID
;EFIAPI
;__aeabi_memmove (
; IN  VOID          *Destination,
; IN  CONST VOID    *Source,
; IN  UINT32        Size
; );
;
__aeabi_memmove
  CMP     r2, #0
  BXEQ    r14
  CMP     r0, r1
  BXEQ    r14
  BHI     memmove_backward
  BLS     memmove_forward

memmove_forward
  LDRB    r3, [r1], #1
  STRB    r3, [r0], #1
  SUBS    r2, r2, #1
  BXEQ    r14
  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    r14
  B       memmove_backward_loop

  END