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- #------------------------------------------------------------------------------
- #
- # Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
- # SPDX-License-Identifier: BSD-2-Clause-Patent
- #
- # 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
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