ArmPlatformPkg/PrePeiCore/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 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   6 ;
   7 ;------------------------------------------------------------------------------
   8
   9     EXPORT SecSwitchStack
  10
  11     AREA   Switch_Stack, CODE, READONLY
  12
  13 ;/**
  14 ;  This allows the caller to switch the stack and return
  15 ;
  16 ; @param      StackDelta     Signed amount by which to modify the stack pointer
  17 ;
  18 ; @return     Nothing. Goes to the Entry Point passing in the new parameters
  19 ;
  20 ;**/
  21 ;VOID
  22 ;EFIAPI
  23 ;SecSwitchStack (
  24 ;  VOID  *StackDelta
  25 ;  );
  26 ;
  27 SecSwitchStack
  28     MOV   R1, SP
  29     ADD   R1, R0, R1
  30     MOV   SP, R1
  31     BX    LR
  32     END