ArmRealViewEbPkg/SecForPei/Arm/SwitchStack.asm

   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 ; 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     EXPORT SecSwitchStack
  16
  17     AREA   Switch_Stack, CODE, READONLY
  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 SecSwitchStack
  34     MOV   R1, SP
  35     ADD   R1, R0, R1
  36     MOV   SP, R1
  37     BX    LR
  38     END