MdePkg/Library/BaseLib/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 InternalSwitchStackAsm
  16
  17     AREA   Switch_Stack, CODE, READONLY
  18
  19 ;/**
  20 ;  This allows the caller to switch the stack and goes to the new entry point
  21 ;
  22 ; @param      EntryPoint   The pointer to the location to enter
  23 ; @param      Context      Parameter to pass in
  24 ; @param      Context2     Parameter2 to pass in
  25 ; @param      NewStack     New Location of the stack
  26 ;
  27 ; @return     Nothing. Goes to the Entry Point passing in the new parameters
  28 ;
  29 ;**/
  30 ;VOID
  31 ;EFIAPI
  32 ;InternalSwitchStackAsm (
  33 ;  SWITCH_STACK_ENTRY_POINT EntryPoint,
  34 ;  VOID  *Context,
  35 ;  VOID  *Context2,
  36 ;  VOID  *NewStack
  37 ;  );
  38 ;
  39 InternalSwitchStackAsm
  40     MOV   LR, R0
  41     MOV   SP, R3
  42     MOV   R0, R1
  43     MOV   R1, R2
  44     BX    LR
  45     END