1 #------------------------------------------------------------------------------
3 # Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
4 # This program and the accompanying materials
5 # are licensed and made available under the terms and conditions of the BSD License
6 # which accompanies this distribution. The full text of the license may be found at
7 # http://opensource.org/licenses/bsd-license.php.
9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14 # Switch the stack from temporary memory to permenent memory.
16 #------------------------------------------------------------------------------
19 #------------------------------------------------------------------------------
23 # UINT32 TemporaryMemoryBase,
24 # UINT32 PermenentMemoryBase
26 #------------------------------------------------------------------------------
27 ASM_GLOBAL ASM_PFX (SecSwitchStack)
28 ASM_PFX(SecSwitchStack):
30 # Save standard registers so they can be used to change stack
38 # !!CAUTION!! this function address's is pushed into stack after
39 # migration of whole temporary memory, so need save it to permenent
42 movl 20(%esp), %ebx # Save the first parameter
43 movl 24(%esp), %ecx # Save the second parameter
46 # Save this function's return address into permenent memory at first.
47 # Then, Fixup the esp point to permenent memory
52 movl 0(%esp), %edx # copy pushed register's value to permenent memory
60 movl 16(%esp), %edx # Update this function's return address into permenent memory
62 movl %eax, %esp # From now, esp is pointed to permenent memory
65 # Fixup the ebp point to permenent memory
70 movl %eax, %ebp # From now, ebp is pointed to permenent memory