fa97cbf4ef
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
110 lines
3.3 KiB
NASM
110 lines
3.3 KiB
NASM
;/** @file
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;
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; This code provides low level routines that support the Virtual Machine
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; for option ROMs.
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;
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; Copyright (c) 2006 - 2011, 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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;**/
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page ,132
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title VM ASSEMBLY LANGUAGE ROUTINES
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;---------------------------------------------------------------------------
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; Equate files needed.
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;---------------------------------------------------------------------------
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.XLIST
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.LIST
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;---------------------------------------------------------------------------
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; Assembler options
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;---------------------------------------------------------------------------
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.686p
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.model flat
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.code
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CopyMem PROTO C Destination:PTR DWORD, Source:PTR DWORD, Count:DWORD
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;****************************************************************************
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; EbcLLCALLEXNative
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;
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; This function is called to execute an EBC CALLEX instruction
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; to native code.
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; This instruction requires that we thunk out to external native
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; code. For IA32, we simply switch stacks and jump to the
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; specified function. On return, we restore the stack pointer
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; to its original location.
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;
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; Destroys no working registers.
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;****************************************************************************
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; INT64 EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)
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_EbcLLCALLEXNative PROC PUBLIC
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push ebp
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push ebx
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mov ebp, esp ; standard function prolog
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; Get function address in a register
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; mov ecx, FuncAddr => mov ecx, dword ptr [FuncAddr]
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mov ecx, dword ptr [esp]+0Ch
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; Set stack pointer to new value
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; mov eax, NewStackPointer => mov eax, dword ptr [NewSp]
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mov eax, dword ptr [esp] + 14h
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mov edx, dword ptr [esp] + 10h
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sub eax, edx
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sub esp, eax
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mov ebx, esp
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push ecx
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push eax
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push edx
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push ebx
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call CopyMem
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pop eax
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pop eax
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pop eax
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pop ecx
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; Now call the external routine
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call ecx
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; ebp is preserved by the callee. In this function it
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; equals the original esp, so set them equal
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mov esp, ebp
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; Standard function epilog
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mov esp, ebp
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pop ebx
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pop ebp
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ret
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_EbcLLCALLEXNative ENDP
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; UINTN EbcLLGetEbcEntryPoint(VOID);
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; Routine Description:
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; The VM thunk code stuffs an EBC entry point into a processor
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; register. Since we can't use inline assembly to get it from
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; the interpreter C code, stuff it into the return value
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; register and return.
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;
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; Arguments:
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; None.
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;
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; Returns:
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; The contents of the register in which the entry point is passed.
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;
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_EbcLLGetEbcEntryPoint PROC PUBLIC
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; The EbcEntryPoint is saved to EAX, so just return here.
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ret
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_EbcLLGetEbcEntryPoint ENDP
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END
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