ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   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
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  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(__aeabi_memcpy)
  18   GCC_ASM_EXPORT(memcpy)
  19
  20 ASM_PFX(__aeabi_memcpy):
  21 ASM_PFX(memcpy):
  22   cmp     r2, #0
  23   bxeq    lr
  24   push    {lr}
  25   mov     lr, r0
  26 L5:
  27   ldrb  r3, [r1], #1  @ zero_extendqisi2
  28   strb  r3, [lr], #1
  29   subs r2, r2, #1
  30   bne  L5
  31   pop  {pc}
  32