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
   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(memcpy)
  18
  19 ASM_PFX(memcpy):
  20   stmfd  sp!, {r7, lr}
  21   mov  ip, #0
  22   add  r7, sp, #0
  23   mov  lr, r0
  24   b  L4
  25 L5:
  26   ldrb  r3, [r1], #1  @ zero_extendqisi2
  27   add  ip, ip, #1
  28   and  r3, r3, #255
  29   strb  r3, [lr], #1
  30 L4:
  31   cmp  ip, r2
  32   bne  L5
  33   ldmfd  sp!, {r7, pc}
  34