1) Fix GCC version EBC interpreter bug.

Add missing EFIPAI for EbcInterpret and ExecuteEbcImageEntryPoint().
	Get return value in EbcLLCALLEXNative(), remove EbcLLGetReturnValue().

2) Fix IA32 EBC interpreter bug on MOVsnw and MOVsnd.

3) Some cleanup
	Add missing ReturnEBCStack() for IA32 build.
	Remove unnecessary EbcLLGetStackPointer() for X64 and IPF build.
	Remove deadcode EbcLLGetStackPointer() and EbcLLGetReturnValue() in IA32/X64/IPF ASM code.
	Dump more info in CommonEbcExceptionHandler().

Signed-off-by: jyao1
Reviewed-by: Elvinli

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12745 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/EbcDxe/Ia32/EbcLowLevel.asm

@@ -3,7 +3,7 @@
 ;    This code provides low level routines that support the Virtual Machine
 ;    for option ROMs.
 ;  
-;  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+;  Copyright (c) 2006 - 2011, 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
@@ -32,9 +32,6 @@
 .686p
 .model  flat
 .code
-;---------------------------------------------------------------------------
-;;GenericPostSegment      SEGMENT USE16
-;---------------------------------------------------------------------------
 CopyMem  PROTO  C Destination:PTR DWORD, Source:PTR DWORD, Count:DWORD
 
 ;****************************************************************************
@@ -49,8 +46,8 @@ CopyMem  PROTO  C Destination:PTR DWORD, Source:PTR DWORD, Count:DWORD
 ;
 ; Destroys no working registers.
 ;****************************************************************************
-; VOID EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)
-_EbcLLCALLEXNative        PROC    NEAR    PUBLIC
+; INT64 EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)
+_EbcLLCALLEXNative        PROC        PUBLIC
       push   ebp
       push   ebx
       mov    ebp, esp              ; standard function prolog
@@ -104,50 +101,9 @@ _EbcLLCALLEXNative    ENDP
 ; Returns:
 ;     The contents of the register in which the entry point is passed.
 ;
-_EbcLLGetEbcEntryPoint        PROC    NEAR    PUBLIC
+_EbcLLGetEbcEntryPoint        PROC        PUBLIC
+    ; The EbcEntryPoint is saved to EAX, so just return here.
     ret
 _EbcLLGetEbcEntryPoint    ENDP
 
-;/*++
-;
-;Routine Description:
-;
-;  Return the caller's value of the stack pointer.
-;
-;Arguments:
-;
-;  None.
-;
-;Returns:
-;
-;  The current value of the stack pointer for the caller. We
-;  adjust it by 4 here because when they called us, the return address
-;  is put on the stack, thereby lowering it by 4 bytes.
-;
-;--*/
-
-; UINTN EbcLLGetStackPointer()
-_EbcLLGetStackPointer        PROC    NEAR    PUBLIC
-    mov    eax, esp      ; get current stack pointer
-    add   eax, 4        ; stack adjusted by this much when we were called
-    ret
-_EbcLLGetStackPointer    ENDP
-
-; UINT64 EbcLLGetReturnValue(VOID);
-; Routine Description:
-;   When EBC calls native, on return the VM has to stuff the return
-;   value into a VM register. It's assumed here that the value is still
-;    in the register, so simply return and the caller should get the
-;   return result properly.
-;
-; Arguments:
-;     None.
-;
-; Returns:
-;     The unmodified value returned by the native code.
-;
-_EbcLLGetReturnValue   PROC    NEAR    PUBLIC
-    ret
-_EbcLLGetReturnValue    ENDP
-
 END