ArmPlatformPkg/PrePeiCore/Arm/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 # SPDX-License-Identifier: BSD-2-Clause-Patent
   6 #
   7 #------------------------------------------------------------------------------
   8
   9 #include <AsmMacroIoLib.h>
  10
  11 #/**
  12 #  This allows the caller to switch the stack and return
  13 #
  14 # @param      StackDelta     Signed amount by which to modify the stack pointer
  15 #
  16 # @return     Nothing. Goes to the Entry Point passing in the new parameters
  17 #
  18 #**/
  19 #VOID
  20 #EFIAPI
  21 #SecSwitchStack (
  22 #  VOID  *StackDelta
  23 #  )#
  24 #
  25 ASM_FUNC(SecSwitchStack)
  26     mov   R1, R13
  27     add   R1, R0, R1
  28     mov   R13, R1
  29     bx    LR
  30
  31
  32