ArmPkg/Library/CompilerIntrinsicsLib/Arm/memset.S

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   2 #
   3 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 # Copyright (c) 2014, ARM Ltd. All rights reserved.<BR>
   5 #
   6 # This program and the accompanying materials
   7 # are licensed and made available under the terms and conditions of the BSD License
   8 # which accompanies this distribution.  The full text of the license may be found at
   9 # http://opensource.org/licenses/bsd-license.php
  10 #
  11 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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  14 #------------------------------------------------------------------------------
  15
  16
  17   .text
  18   .syntax unified
  19   .align 2
  20   GCC_ASM_EXPORT (memset)
  21   GCC_ASM_EXPORT (__aeabi_memset)
  22
  23 # VOID
  24 # EFIAPI
  25 # __aeabi_memset (
  26 #  IN  VOID    *Destination,
  27 #  IN  UINT32  Size
  28 #  IN  UINT32  Character,
  29 #  );
  30 ASM_PFX(__aeabi_memset):
  31   subs  ip, r1, #0
  32   bxeq  lr
  33   mov   r1, r2
  34   b     L10
  35
  36 # VOID
  37 # EFIAPI
  38 # memset (
  39 #  IN  VOID    *Destination,
  40 #  IN  UINT32  Character,
  41 #  IN  UINT32  Size
  42 #  );
  43   //
  44   // This object may be pulled in to satisfy an undefined reference to
  45   // __aeabi_memset above, but in some cases, memset() is already provided
  46   // by another library (i.e., CryptoPkg/IntrinsicLib), in which case we
  47   // prefer the other version. So allow this one to be overridden by
  48   // giving it weak linkage.
  49   //
  50   .weak   memset
  51 ASM_PFX(memset):
  52   subs ip, r2, #0
  53   bxeq lr
  54   @ args = 0, pretend = 0, frame = 0
  55   @ frame_needed = 1, uses_anonymous_args = 0
  56 L10:
  57   strb  r1, [r0], #1
  58   subs  ip, ip, #1
  59   @ While size is not 0
  60   bne  L10
  61   bx   lr