e5eed7d364
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10418 6f19259b-4bc3-4df7-8a09-765794883524
146 lines
4.1 KiB
NASM
146 lines
4.1 KiB
NASM
;/** @file
|
|
;
|
|
; This code provides low level routines that support the Virtual Machine.
|
|
; for option ROMs.
|
|
;
|
|
; Copyright (c) 2006 - 2008, 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.
|
|
;
|
|
;**/
|
|
|
|
page ,132
|
|
title VM ASSEMBLY LANGUAGE ROUTINES
|
|
|
|
;---------------------------------------------------------------------------
|
|
; Equate files needed.
|
|
;---------------------------------------------------------------------------
|
|
|
|
text SEGMENT
|
|
|
|
;---------------------------------------------------------------------------
|
|
;;GenericPostSegment SEGMENT USE16
|
|
;---------------------------------------------------------------------------
|
|
|
|
;****************************************************************************
|
|
; EbcLLCALLEX
|
|
;
|
|
; This function is called to execute an EBC CALLEX instruction.
|
|
; This instruction requires that we thunk out to external native
|
|
; code. For x64, we switch stacks, copy the arguments to the stack
|
|
; and jump to the specified function.
|
|
; On return, we restore the stack pointer to its original location.
|
|
;
|
|
; Destroys no working registers.
|
|
;****************************************************************************
|
|
; VOID EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)
|
|
|
|
CopyMem PROTO Destination:PTR DWORD, Source:PTR DWORD, Count:DWORD
|
|
|
|
|
|
EbcLLCALLEXNative PROC PUBLIC
|
|
push rbp
|
|
push rbx
|
|
mov rbp, rsp
|
|
; Function prolog
|
|
|
|
; Copy FuncAddr to a preserved register.
|
|
mov rbx, rcx
|
|
|
|
; Set stack pointer to new value
|
|
sub r8, rdx
|
|
sub rsp, r8
|
|
mov rcx, rsp
|
|
sub rsp, 20h
|
|
call CopyMem
|
|
add rsp, 20h
|
|
|
|
; Considering the worst case, load 4 potiential arguments
|
|
; into registers.
|
|
mov rcx, qword ptr [rsp]
|
|
mov rdx, qword ptr [rsp+8h]
|
|
mov r8, qword ptr [rsp+10h]
|
|
mov r9, qword ptr [rsp+18h]
|
|
|
|
; Now call the external routine
|
|
call rbx
|
|
|
|
; Function epilog
|
|
mov rsp, rbp
|
|
pop rbx
|
|
pop rbp
|
|
ret
|
|
EbcLLCALLEXNative ENDP
|
|
|
|
|
|
; UINTN EbcLLGetEbcEntryPoint(VOID);
|
|
; Routine Description:
|
|
; The VM thunk code stuffs an EBC entry point into a processor
|
|
; register. Since we can't use inline assembly to get it from
|
|
; the interpreter C code, stuff it into the return value
|
|
; register and return.
|
|
;
|
|
; Arguments:
|
|
; None.
|
|
;
|
|
; Returns:
|
|
; The contents of the register in which the entry point is passed.
|
|
;
|
|
EbcLLGetEbcEntryPoint PROC PUBLIC
|
|
mov rax, r10
|
|
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 PUBLIC
|
|
mov rax, rsp ; get current stack pointer
|
|
; Stack adjusted by this much when we were called,
|
|
; For this function, it's 4.
|
|
add rax, 4
|
|
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 PUBLIC
|
|
ret
|
|
EbcLLGetReturnValue ENDP
|
|
|
|
text ENDS
|
|
END
|
|
|