mirror of https://github.com/acidanthera/audk.git
89 lines
2.4 KiB
NASM
89 lines
2.4 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; Stack.asm
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;
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; Abstract:
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;
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; Switch the stack from temporary memory to permanent memory.
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;
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;------------------------------------------------------------------------------
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.586p
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.model flat,C
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.code
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; SecSwitchStack (
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; UINT32 TemporaryMemoryBase,
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; UINT32 PermenentMemoryBase
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; );
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;------------------------------------------------------------------------------
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SecSwitchStack PROC
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;
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; Save three register: eax, ebx, ecx
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;
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push eax
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push ebx
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push ecx
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push edx
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;
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; !!CAUTION!! this function address's is pushed into stack after
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; migration of whole temporary memory, so need save it to permanent
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; memory at first!
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;
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mov ebx, [esp + 20] ; Save the first parameter
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mov ecx, [esp + 24] ; Save the second parameter
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;
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; Save this function's return address into permanent memory at first.
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; Then, Fixup the esp point to permanent memory
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;
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mov eax, esp
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sub eax, ebx
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add eax, ecx
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mov edx, dword ptr [esp] ; copy pushed register's value to permanent memory
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mov dword ptr [eax], edx
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mov edx, dword ptr [esp + 4]
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mov dword ptr [eax + 4], edx
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mov edx, dword ptr [esp + 8]
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mov dword ptr [eax + 8], edx
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mov edx, dword ptr [esp + 12]
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mov dword ptr [eax + 12], edx
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mov edx, dword ptr [esp + 16] ; Update this function's return address into permanent memory
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mov dword ptr [eax + 16], edx
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mov esp, eax ; From now, esp is pointed to permanent memory
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;
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; Fixup the ebp point to permanent memory
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;
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mov eax, ebp
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sub eax, ebx
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add eax, ecx
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mov ebp, eax ; From now, ebp is pointed to permanent memory
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;
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; Fixup callee's ebp point for PeiDispatch
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;
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mov eax, dword ptr [ebp]
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sub eax, ebx
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add eax, ecx
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mov dword ptr [ebp], eax ; From now, Temporary's PPI caller's stack is in permanent memory
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pop edx
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pop ecx
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pop ebx
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pop eax
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ret
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SecSwitchStack ENDP
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END
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