mirror of https://github.com/acidanthera/audk.git
96 lines
2.9 KiB
NASM
96 lines
2.9 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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.CODE
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CopyMem PROTO Destination:PTR DWORD, Source:PTR DWORD, Count:DWORD
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;****************************************************************************
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; EbcLLCALLEX
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;
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; This function is called to execute an EBC CALLEX instruction.
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; This instruction requires that we thunk out to external native
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; code. For x64, we switch stacks, copy the arguments to the stack
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; and jump to the specified function.
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; On return, we restore the stack pointer 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 rbp
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push rbx
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mov rbp, rsp
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; Function prolog
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; Copy FuncAddr to a preserved register.
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mov rbx, rcx
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; Set stack pointer to new value
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sub r8, rdx
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sub rsp, r8
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mov rcx, rsp
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sub rsp, 20h
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call CopyMem
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add rsp, 20h
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; Considering the worst case, load 4 potiential arguments
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; into registers.
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mov rcx, qword ptr [rsp]
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mov rdx, qword ptr [rsp+8h]
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mov r8, qword ptr [rsp+10h]
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mov r9, qword ptr [rsp+18h]
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; Now call the external routine
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call rbx
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; Function epilog
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mov rsp, rbp
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pop rbx
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pop rbp
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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 R10.
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mov rax, r10
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ret
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EbcLLGetEbcEntryPoint ENDP
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END
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