MdePkg/Library/BaseLib/Arm/SwitchStack.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2018, 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 InternalSwitchStackAsm
  10
  11     AREA   Switch_Stack, CODE, READONLY
  12
  13 ;/**
  14 ;  This allows the caller to switch the stack and goes to the new entry point
  15 ;
  16 ; @param      EntryPoint   The pointer to the location to enter
  17 ; @param      Context      Parameter to pass in
  18 ; @param      Context2     Parameter2 to pass in
  19 ; @param      NewStack     New Location of the stack
  20 ;
  21 ; @return     Nothing. Goes to the Entry Point passing in the new parameters
  22 ;
  23 ;**/
  24 ;VOID
  25 ;EFIAPI
  26 ;InternalSwitchStackAsm (
  27 ;  SWITCH_STACK_ENTRY_POINT EntryPoint,
  28 ;  VOID  *Context,
  29 ;  VOID  *Context2,
  30 ;  VOID  *NewStack
  31 ;  );
  32 ;
  33 InternalSwitchStackAsm
  34     MOV   LR, R0
  35     MOV   SP, R3
  36     MOV   R0, R1
  37     MOV   R1, R2
  38     BX    LR
  39     END