+++ /dev/null
-;/** @file\r
-; \r
-; This code provides low level routines that support the Virtual Machine.\r
-; for option ROMs.\r
-; \r
-; Copyright (c) 2006 - 2008, Intel Corporation. <BR>\r
-; All rights reserved. This program and the accompanying materials\r
-; are licensed and made available under the terms and conditions of the BSD License\r
-; which accompanies this distribution. The full text of the license may be found at\r
-; http://opensource.org/licenses/bsd-license.php\r
-; \r
-; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
-; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-; \r
-;**/\r
-\r
- page ,132\r
- title VM ASSEMBLY LANGUAGE ROUTINES\r
-\r
-;---------------------------------------------------------------------------\r
-; Equate files needed.\r
-;---------------------------------------------------------------------------\r
-\r
-text SEGMENT\r
-\r
-;---------------------------------------------------------------------------\r
-;;GenericPostSegment SEGMENT USE16\r
-;---------------------------------------------------------------------------\r
-\r
-;****************************************************************************\r
-; EbcLLCALLEX\r
-;\r
-; This function is called to execute an EBC CALLEX instruction.\r
-; This instruction requires that we thunk out to external native\r
-; code. For x64, we switch stacks, copy the arguments to the stack\r
-; and jump to the specified function.\r
-; On return, we restore the stack pointer to its original location.\r
-;\r
-; Destroys no working registers.\r
-;****************************************************************************\r
-; VOID EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)\r
-\r
-CopyMem PROTO Destination:PTR DWORD, Source:PTR DWORD, Count:DWORD\r
-\r
-\r
-EbcLLCALLEXNative PROC PUBLIC\r
- push rbp\r
- push rbx\r
- mov rbp, rsp\r
- ; Function prolog\r
-\r
- ; Copy FuncAddr to a preserved register.\r
- mov rbx, rcx\r
-\r
- ; Set stack pointer to new value\r
- sub r8, rdx\r
- sub rsp, r8\r
- mov rcx, rsp\r
- sub rsp, 20h\r
- call CopyMem\r
- add rsp, 20h\r
-\r
- ; Considering the worst case, load 4 potiential arguments\r
- ; into registers.\r
- mov rcx, qword ptr [rsp]\r
- mov rdx, qword ptr [rsp+8h]\r
- mov r8, qword ptr [rsp+10h]\r
- mov r9, qword ptr [rsp+18h]\r
-\r
- ; Now call the external routine\r
- call rbx\r
-\r
- ; Function epilog\r
- mov rsp, rbp\r
- pop rbx\r
- pop rbp\r
- ret\r
-EbcLLCALLEXNative ENDP\r
-\r
-\r
-; UINTN EbcLLGetEbcEntryPoint(VOID);\r
-; Routine Description:\r
-; The VM thunk code stuffs an EBC entry point into a processor\r
-; register. Since we can't use inline assembly to get it from\r
-; the interpreter C code, stuff it into the return value\r
-; register and return.\r
-;\r
-; Arguments:\r
-; None.\r
-;\r
-; Returns:\r
-; The contents of the register in which the entry point is passed.\r
-;\r
-EbcLLGetEbcEntryPoint PROC PUBLIC\r
- ret\r
-EbcLLGetEbcEntryPoint ENDP\r
-\r
-;/*++\r
-;\r
-;Routine Description:\r
-;\r
-; Return the caller's value of the stack pointer.\r
-;\r
-;Arguments:\r
-;\r
-; None.\r
-;\r
-;Returns:\r
-;\r
-; The current value of the stack pointer for the caller. We\r
-; adjust it by 4 here because when they called us, the return address\r
-; is put on the stack, thereby lowering it by 4 bytes.\r
-;\r
-;--*/\r
-\r
-; UINTN EbcLLGetStackPointer()\r
-EbcLLGetStackPointer PROC PUBLIC\r
- mov rax, rsp ; get current stack pointer\r
- ; Stack adjusted by this much when we were called,\r
- ; For this function, it's 4.\r
- add rax, 4\r
- ret\r
-EbcLLGetStackPointer ENDP\r
-\r
-; UINT64 EbcLLGetReturnValue(VOID);\r
-; Routine Description:\r
-; When EBC calls native, on return the VM has to stuff the return\r
-; value into a VM register. It's assumed here that the value is still\r
-; in the register, so simply return and the caller should get the\r
-; return result properly.\r
-;\r
-; Arguments:\r
-; None.\r
-;\r
-; Returns:\r
-; The unmodified value returned by the native code.\r
-;\r
-EbcLLGetReturnValue PROC PUBLIC\r
- ret\r
-EbcLLGetReturnValue ENDP\r
-\r
-text ENDS\r
-END\r
-\r