mirror of https://github.com/acidanthera/audk.git
111 lines
3.3 KiB
NASM
111 lines
3.3 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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 permenent memory.
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;
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;------------------------------------------------------------------------------
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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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mov [rsp + 08h], rcx
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mov [rsp + 10h], rdx
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;
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; Save three register: eax, ebx, ecx
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;
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push rax
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push rbx
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push rcx
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push rdx
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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 permenent
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; memory at first!
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;
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mov rbx, [rsp + 28h] ; Save the first parameter
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mov rcx, [rsp + 30h] ; Save the second parameter
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;
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; Save this function's return address into permenent memory at first.
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; Then, Fixup the esp point to permenent memory
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;
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mov rax, rsp
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sub rax, rbx
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add rax, rcx
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mov rdx, qword ptr [rsp] ; copy pushed register's value to permenent memory
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mov qword ptr [rax], rdx
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mov rdx, qword ptr [rsp + 8]
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mov qword ptr [rax + 8], rdx
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mov rdx, qword ptr [rsp + 10h]
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mov qword ptr [rax + 10h], rdx
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mov rdx, qword ptr [rsp + 18h]
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mov qword ptr [rax + 18h], rdx
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mov rdx, qword ptr [rsp + 20h] ; Update this function's return address into permenent memory
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mov qword ptr [rax + 20h], rdx
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mov rsp, rax ; From now, esp is pointed to permenent memory
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;
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; Fixup the ebp point to permenent memory
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;
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mov rax, rbp
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sub rax, rbx
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add rax, rcx
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mov rbp, rax ; From now, ebp is pointed to permenent memory
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pop rdx
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pop rcx
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pop rbx
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pop rax
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ret
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SecSwitchStack ENDP
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; PeiSwitchStacks (
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; IN SWITCH_STACK_ENTRY_POINT EntryPoint,
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; IN VOID *Context1, OPTIONAL
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; IN VOID *Context2, OPTIONAL
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; IN VOID *Context3, OPTIONAL
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; IN VOID *NewStack
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; )
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;------------------------------------------------------------------------------
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PeiSwitchStacks PROC
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mov rax, rcx
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mov rcx, rdx
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mov rdx, r8
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mov r8, r9
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mov rsp, [rsp + 28h]
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sub rsp, 20h
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call rax
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jmp $
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ret
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PeiSwitchStacks ENDP
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END
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