diff options
| author | Guo Mang <mang.guo@intel.com> | 2016-12-22 16:16:34 +0800 |
|---|---|---|
| committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:45 +0800 |
| commit | 98978ffbf63ed054a7b69a2d9c21ce765d988018 (patch) | |
| tree | 7c75a67c7fe8133625cab086f487f0f7497b4756 /Core/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.nasm | |
| parent | b47932475500fc4b72ceab745aefd590ad1d1e6a (diff) | |
| download | edk2-platforms-98978ffbf63ed054a7b69a2d9c21ce765d988018.tar.xz | |
IntelFsp2WrapperPkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.nasm')
| -rw-r--r-- | Core/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.nasm | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Core/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.nasm b/Core/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.nasm new file mode 100644 index 0000000000..304678d940 --- /dev/null +++ b/Core/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.nasm @@ -0,0 +1,79 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2016, 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.
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; SecSwitchStack (
+; UINT32 TemporaryMemoryBase,
+; UINT32 PermanentMemoryBase
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(SecSwitchStack)
+ASM_PFX(SecSwitchStack):
+ ;
+ ; Save three register: eax, ebx, ecx
+ ;
+ push eax
+ push ebx
+ push ecx
+ push edx
+
+ ;
+ ; !!CAUTION!! this function address's is pushed into stack after
+ ; migration of whole temporary memory, so need save it to permanent
+ ; memory at first!
+ ;
+
+ mov ebx, [esp + 20] ; Save the first parameter
+ mov ecx, [esp + 24] ; Save the second parameter
+
+ ;
+ ; Save this function's return address into permanent memory at first.
+ ; Then, Fixup the esp point to permanent memory
+ ;
+ mov eax, esp
+ sub eax, ebx
+ add eax, ecx
+ mov edx, dword [esp] ; copy pushed register's value to permanent memory
+ mov dword [eax], edx
+ mov edx, dword [esp + 4]
+ mov dword [eax + 4], edx
+ mov edx, dword [esp + 8]
+ mov dword [eax + 8], edx
+ mov edx, dword [esp + 12]
+ mov dword [eax + 12], edx
+ mov edx, dword [esp + 16] ; Update this function's return address into permanent memory
+ mov dword [eax + 16], edx
+ mov esp, eax ; From now, esp is pointed to permanent memory
+
+ ;
+ ; Fixup the ebp point to permanent memory
+ ;
+ mov eax, ebp
+ sub eax, ebx
+ add eax, ecx
+ mov ebp, eax ; From now, ebp is pointed to permanent memory
+
+ pop edx
+ pop ecx
+ pop ebx
+ pop eax
+ ret
+
|