| #------------------------------------------------------------------------------ |
| # |
| # Copyright (c) 2013, Intel Corporation. All rights reserved.<BR> |
| # This program and the accompanying materials |
| # are licensed and made available under the terms and conditions of the BSD License |
| # which accompanies this distribution. The full text of the license may be found at |
| # http://opensource.org/licenses/bsd-license.php. |
| # |
| # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. |
| # |
| # Abstract: |
| # |
| # Switch the stack from temporary memory to permenent memory. |
| # |
| #------------------------------------------------------------------------------ |
| |
| |
| #------------------------------------------------------------------------------ |
| # VOID |
| # EFIAPI |
| # SecSwitchStack ( |
| # UINT32 TemporaryMemoryBase, |
| # UINT32 PermenentMemoryBase |
| # )# |
| #------------------------------------------------------------------------------ |
| ASM_GLOBAL ASM_PFX (SecSwitchStack) |
| ASM_PFX(SecSwitchStack): |
| # |
| # Save standard registers so they can be used to change stack |
| # |
| pushl %eax |
| pushl %ebx |
| pushl %ecx |
| pushl %edx |
| |
| # |
| # !!CAUTION!! this function address's is pushed into stack after |
| # migration of whole temporary memory, so need save it to permenent |
| # memory at first! |
| # |
| movl 20(%esp), %ebx # Save the first parameter |
| movl 24(%esp), %ecx # Save the second parameter |
| |
| # |
| # Save this function's return address into permenent memory at first. |
| # Then, Fixup the esp point to permenent memory |
| # |
| movl %esp, %eax |
| subl %ebx, %eax |
| addl %ecx, %eax |
| movl 0(%esp), %edx # copy pushed register's value to permenent memory |
| movl %edx, 0(%eax) |
| movl 4(%esp), %edx |
| movl %edx, 4(%eax) |
| movl 8(%esp), %edx |
| movl %edx, 8(%eax) |
| movl 12(%esp), %edx |
| movl %edx, 12(%eax) |
| movl 16(%esp), %edx # Update this function's return address into permenent memory |
| movl %edx, 16(%eax) |
| movl %eax, %esp # From now, esp is pointed to permenent memory |
| |
| # |
| # Fixup the ebp point to permenent memory |
| # |
| movl %ebp, %eax |
| subl %ebx, %eax |
| addl %ecx, %eax |
| movl %eax, %ebp # From now, ebp is pointed to permenent memory |
| |
| popl %edx |
| popl %ecx |
| popl %ebx |
| popl %eax |
| ret |
| |
| |