MdePkg/Library/BaseLib/ia32/InterlockedCompareExchange32.s

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006, Intel Corporation
   4 # All rights reserved. This program and the accompanying materials
   5 # are licensed and made available under the terms and conditions of the BSD License
   6 # which accompanies this distribution.  The full text of the license may be found at
   7 # http://opensource.org/licenses/bsd-license.php
   8 #
   9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 #
  12 # Module Name:
  13 #
  14 #   InterlockedCompareExchange32.Asm
  15 #
  16 # Abstract:
  17 #
  18 #   InterlockedCompareExchange32 function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23
  24
  25
  26
  27
  28 #------------------------------------------------------------------------------
  29 # VOID *
  30 # EFIAPI
  31 # InterlockedCompareExchangePointer (
  32 #   IN      VOID                      **Value,
  33 #   IN      VOID                      *CompareValue,
  34 #   IN      VOID                      *ExchangeValue
  35 #   );
  36 #------------------------------------------------------------------------------
  37 .global _InterlockedCompareExchangePointer
  38 _InterlockedCompareExchangePointer:
  39     #
  40     # InterlockedCompareExchangePointer() shares the same code as
  41     # InterlockedCompareExchange32() on IA32 and thus no code inside this
  42     # function
  43     #
  44
  45
  46 #------------------------------------------------------------------------------
  47 # UINT32
  48 # EFIAPI
  49 # InterlockedCompareExchange32 (
  50 #   IN      UINT32                    *Value,
  51 #   IN      UINT32                    CompareValue,
  52 #   IN      UINT32                    ExchangeValue
  53 #   );
  54 #------------------------------------------------------------------------------
  55 .global _InterlockedCompareExchange32
  56 _InterlockedCompareExchange32:
  57     movl    4(%esp),%ecx
  58     movl    8(%esp),%eax
  59     movl    12(%esp),%edx
  60     lock    cmpxchgl %edx,(%ecx)
  61     ret
  62
  63
  64