diff options
| author | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-15 00:03:25 +0000 |
|---|---|---|
| committer | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-15 00:03:25 +0000 |
| commit | e148512e5132e38accf2fe8188a9bdf9d1de02d8 (patch) | |
| tree | d49269a1679a3e0c29f07fb79b4124b745bc7b42 /EmulatorPkg/Sec/Ia32 | |
| parent | 33efdf51b0f123259dec0bfcff49af189b46c411 (diff) | |
| download | edk2-e148512e5132e38accf2fe8188a9bdf9d1de02d8.zip edk2-e148512e5132e38accf2fe8188a9bdf9d1de02d8.tar.gz edk2-e148512e5132e38accf2fe8188a9bdf9d1de02d8.tar.bz2 | |
EmulatorPkg: Fix Visual Studio build for IA32 & X64
This code is untested since there is currently no 'host' component
for Win32/Win64.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13633 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'EmulatorPkg/Sec/Ia32')
| -rw-r--r-- | EmulatorPkg/Sec/Ia32/SwitchRam.asm | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/EmulatorPkg/Sec/Ia32/SwitchRam.asm b/EmulatorPkg/Sec/Ia32/SwitchRam.asm new file mode 100644 index 0000000..a2e1f3e --- /dev/null +++ b/EmulatorPkg/Sec/Ia32/SwitchRam.asm @@ -0,0 +1,94 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2007 - 2012, 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.
+;
+; Module Name:
+;
+; Stack.asm
+;
+; Abstract:
+;
+; Switch the stack from temporary memory to permenent memory.
+;
+;------------------------------------------------------------------------------
+
+ .586p
+ .model flat,C
+ .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; SecSwitchStack (
+; UINT32 TemporaryMemoryBase,
+; UINT32 PermenentMemoryBase
+; );
+;------------------------------------------------------------------------------
+SecSwitchStack PROC
+ ;
+ ; 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 permenent
+ ; 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 permenent memory at first.
+ ; Then, Fixup the esp point to permenent memory
+ ;
+ mov eax, esp
+ sub eax, ebx
+ add eax, ecx
+ mov edx, dword ptr [esp] ; copy pushed register's value to permenent memory
+ mov dword ptr [eax], edx
+ mov edx, dword ptr [esp + 4]
+ mov dword ptr [eax + 4], edx
+ mov edx, dword ptr [esp + 8]
+ mov dword ptr [eax + 8], edx
+ mov edx, dword ptr [esp + 12]
+ mov dword ptr [eax + 12], edx
+ mov edx, dword ptr [esp + 16] ; Update this function's return address into permenent memory
+ mov dword ptr [eax + 16], edx
+ mov esp, eax ; From now, esp is pointed to permenent memory
+
+ ;
+ ; Fixup the ebp point to permenent memory
+ ;
+ mov eax, ebp
+ sub eax, ebx
+ add eax, ecx
+ mov ebp, eax ; From now, ebp is pointed to permenent memory
+
+ ;
+ ; Fixup callee's ebp point for PeiDispatch
+ ;
+ mov eax, dword ptr [ebp]
+ sub eax, ebx
+ add eax, ecx
+ mov dword ptr [ebp], eax ; From now, Temporary's PPI caller's stack is in permenent memory
+
+ pop edx
+ pop ecx
+ pop ebx
+ pop eax
+ ret
+SecSwitchStack ENDP
+
+ END
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