ArmPlatformPkg/PrePeiCore/AArch64/SwitchStack.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
   4 # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   5 # Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
   6 #
   7 # This program and the accompanying materials
   8 # are licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php.
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 #------------------------------------------------------------------------------
  16
  17 #include <AsmMacroIoLibV8.h>
  18
  19 #/**
  20 #  This allows the caller to switch the stack and return
  21 #
  22 # @param      StackDelta     Signed amount by which to modify the stack pointer
  23 #
  24 # @return     Nothing. Goes to the Entry Point passing in the new parameters
  25 #
  26 #**/
  27 #VOID
  28 #EFIAPI
  29 #SecSwitchStack (
  30 #  VOID  *StackDelta
  31 #  )#
  32 #
  33 ASM_FUNC(SecSwitchStack)
  34     mov   x1, sp
  35     add   x1, x0, x1
  36     mov   sp, x1
  37     ret
  38