/** @file\r
This module contains EBC support routines that are customized based on\r
- the target processor.\r
+ the target ia32 processor.\r
\r
-Copyright (c) 2006 - 2010, 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
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "EbcInt.h"\r
#include "EbcExecute.h"\r
+#include "EbcDebuggerHook.h"\r
\r
//\r
// NOTE: This is the stack size allocated for the interpreter\r
// platform-specific configurations.\r
//\r
#define VM_STACK_SIZE (1024 * 4)\r
-#define EBC_THUNK_SIZE 32\r
\r
#define STACK_REMAIN_SIZE (1024 * 4)\r
\r
+//\r
+// This is instruction buffer used to create EBC thunk\r
+//\r
+#define EBC_ENTRYPOINT_SIGNATURE 0xAFAFAFAF\r
+#define EBC_LL_EBC_ENTRYPOINT_SIGNATURE 0xFAFAFAFA\r
+UINT8 mInstructionBufferTemplate[] = {\r
+ //\r
+ // Add a magic code here to help the VM recognize the thunk..\r
+ // mov eax, 0xca112ebc => B8 BC 2E 11 CA\r
+ //\r
+ 0xB8, 0xBC, 0x2E, 0x11, 0xCA,\r
+ //\r
+ // Add code bytes to load up a processor register with the EBC entry point.\r
+ // mov eax, EbcEntryPoint => B8 XX XX XX XX (To be fixed at runtime)\r
+ // These 4 bytes of the thunk entry is the address of the EBC\r
+ // entry point.\r
+ //\r
+ 0xB8,\r
+ (UINT8)(EBC_ENTRYPOINT_SIGNATURE & 0xFF),\r
+ (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 8) & 0xFF),\r
+ (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 16) & 0xFF),\r
+ (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 24) & 0xFF),\r
+ //\r
+ // Stick in a load of ecx with the address of appropriate VM function.\r
+ // mov ecx, EbcLLEbcInterpret => B9 XX XX XX XX (To be fixed at runtime)\r
+ //\r
+ 0xB9,\r
+ (UINT8)(EBC_LL_EBC_ENTRYPOINT_SIGNATURE & 0xFF),\r
+ (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 8) & 0xFF),\r
+ (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 16) & 0xFF),\r
+ (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 24) & 0xFF),\r
+ //\r
+ // Stick in jump opcode bytes\r
+ // jmp ecx => FF E1\r
+ //\r
+ 0xFF, 0xE1,\r
+};\r
+\r
+/**\r
+ Begin executing an EBC image.\r
+ This is used for Ebc Thunk call.\r
+\r
+ @return The value returned by the EBC application we're going to run.\r
+\r
+**/\r
+UINT64\r
+EFIAPI\r
+EbcLLEbcInterpret (\r
+ VOID\r
+ );\r
+\r
+/**\r
+ Begin executing an EBC image.\r
+ This is used for Ebc image entrypoint.\r
+\r
+ @return The value returned by the EBC application we're going to run.\r
+\r
+**/\r
+UINT64\r
+EFIAPI\r
+EbcLLExecuteEbcImageEntryPoint (\r
+ VOID\r
+ );\r
\r
/**\r
This function is called to execute an EBC CALLEX instruction.\r
{\r
UINTN IsThunk;\r
UINTN TargetEbcAddr;\r
+ UINT8 InstructionBuffer[sizeof(mInstructionBufferTemplate)];\r
+ UINTN Index;\r
+ UINTN IndexOfEbcEntrypoint;\r
\r
IsThunk = 1;\r
TargetEbcAddr = 0;\r
+ IndexOfEbcEntrypoint = 0;\r
\r
//\r
// Processor specific code to check whether the callee is a thunk to EBC.\r
//\r
- if (*((UINT8 *)FuncAddr) != 0xB8) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 1) != 0xBC) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 2) != 0x2E) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 3) != 0x11) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 4) != 0xCA) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 5) != 0xB8) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 10) != 0xB9) {\r
- IsThunk = 0;\r
- goto Action;\r
- }\r
- if (*((UINT8 *)FuncAddr + 15) != 0xFF) {\r
- IsThunk = 0;\r
- goto Action;\r
+ CopyMem (InstructionBuffer, (VOID *)FuncAddr, sizeof(InstructionBuffer));\r
+ //\r
+ // Fill the signature according to mInstructionBufferTemplate\r
+ //\r
+ for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {\r
+ if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_ENTRYPOINT_SIGNATURE) {\r
+ *(UINTN *)&InstructionBuffer[Index] = EBC_ENTRYPOINT_SIGNATURE;\r
+ IndexOfEbcEntrypoint = Index;\r
+ }\r
+ if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {\r
+ *(UINTN *)&InstructionBuffer[Index] = EBC_LL_EBC_ENTRYPOINT_SIGNATURE;\r
+ }\r
}\r
- if (*((UINT8 *)FuncAddr + 16) != 0xE1) {\r
+ //\r
+ // Check if we need thunk to native\r
+ //\r
+ if (CompareMem (InstructionBuffer, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate)) != 0) {\r
IsThunk = 0;\r
- goto Action;\r
}\r
\r
- TargetEbcAddr = ((UINTN)(*((UINT8 *)FuncAddr + 9)) << 24) + ((UINTN)(*((UINT8 *)FuncAddr + 8)) << 16) +\r
- ((UINTN)(*((UINT8 *)FuncAddr + 7)) << 8) + ((UINTN)(*((UINT8 *)FuncAddr + 6)));\r
-\r
-Action:\r
if (IsThunk == 1){\r
//\r
// The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and\r
VmPtr->Gpr[0] -= 8;\r
VmWriteMem64 (VmPtr, (UINTN) VmPtr->Gpr[0], (UINT64) (UINTN) (VmPtr->Ip + Size));\r
\r
+ CopyMem (&TargetEbcAddr, (UINT8 *)FuncAddr + IndexOfEbcEntrypoint, sizeof(UINTN));\r
VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;\r
} else {\r
//\r
- // The callee is not a thunk to EBC, call native code.\r
+ // The callee is not a thunk to EBC, call native code,\r
+ // and get return value.\r
//\r
- EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);\r
+ VmPtr->Gpr[7] = EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);\r
\r
//\r
- // Get return value and advance the IP.\r
+ // Advance the IP.\r
//\r
- VmPtr->Gpr[7] = EbcLLGetReturnValue ();\r
VmPtr->Ip += Size;\r
}\r
}\r
\r
\r
/**\r
- Begin executing an EBC image. The address of the entry point is passed\r
- in via a processor register, so we'll need to make a call to get the\r
- value.\r
+ Begin executing an EBC image.\r
\r
This is a thunk function. Microsoft x64 compiler only provide fast_call\r
calling convention, so the first four arguments are passed by rcx, rdx,\r
r8, and r9, while other arguments are passed in stack.\r
\r
+ @param EntryPoint The entrypoint of EBC code.\r
@param Arg1 The 1st argument.\r
@param Arg2 The 2nd argument.\r
@param Arg3 The 3rd argument.\r
\r
**/\r
UINT64\r
+EFIAPI\r
EbcInterpret (\r
- IN OUT UINTN Arg1,\r
- IN OUT UINTN Arg2,\r
- IN OUT UINTN Arg3,\r
- IN OUT UINTN Arg4,\r
- IN OUT UINTN Arg5,\r
- IN OUT UINTN Arg6,\r
- IN OUT UINTN Arg7,\r
- IN OUT UINTN Arg8,\r
- IN OUT UINTN Arg9,\r
- IN OUT UINTN Arg10,\r
- IN OUT UINTN Arg11,\r
- IN OUT UINTN Arg12,\r
- IN OUT UINTN Arg13,\r
- IN OUT UINTN Arg14,\r
- IN OUT UINTN Arg15,\r
- IN OUT UINTN Arg16\r
+ IN UINTN EntryPoint,\r
+ IN UINTN Arg1,\r
+ IN UINTN Arg2,\r
+ IN UINTN Arg3,\r
+ IN UINTN Arg4,\r
+ IN UINTN Arg5,\r
+ IN UINTN Arg6,\r
+ IN UINTN Arg7,\r
+ IN UINTN Arg8,\r
+ IN UINTN Arg9,\r
+ IN UINTN Arg10,\r
+ IN UINTN Arg11,\r
+ IN UINTN Arg12,\r
+ IN UINTN Arg13,\r
+ IN UINTN Arg14,\r
+ IN UINTN Arg15,\r
+ IN UINTN Arg16\r
)\r
{\r
//\r
UINTN StackIndex;\r
\r
//\r
- // Get the EBC entry point from the processor register.\r
+ // Get the EBC entry point\r
//\r
- Addr = EbcLLGetEbcEntryPoint ();\r
+ Addr = EntryPoint;\r
\r
//\r
// Now clear out our context\r
VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r
VmContext.Gpr[0] = (UINT64)(UINTN) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r
VmContext.HighStackBottom = (UINTN)VmContext.Gpr[0];\r
- VmContext.Gpr[0] &= ~(sizeof (UINTN) - 1);\r
+ VmContext.Gpr[0] &= ~((VM_REGISTER)(sizeof (UINTN) - 1));\r
VmContext.Gpr[0] -= sizeof (UINTN);\r
\r
//\r
//\r
// Begin executing the EBC code\r
//\r
+ EbcDebuggerHookEbcInterpret (&VmContext);\r
EbcExecute (&VmContext);\r
\r
//\r
- // Return the value in R[7] unless there was an error\r
+ // Return the value in Gpr[7] unless there was an error\r
//\r
ReturnEBCStack(StackIndex);\r
return (UINT64) VmContext.Gpr[7];\r
\r
\r
/**\r
- Begin executing an EBC image. The address of the entry point is passed\r
- in via a processor register, so we'll need to make a call to get the\r
- value.\r
+ Begin executing an EBC image.\r
\r
+ @param EntryPoint The entrypoint of EBC code.\r
@param ImageHandle image handle for the EBC application we're executing\r
@param SystemTable standard system table passed into an driver's entry\r
point\r
\r
**/\r
UINT64\r
+EFIAPI\r
ExecuteEbcImageEntryPoint (\r
+ IN UINTN EntryPoint,\r
IN EFI_HANDLE ImageHandle,\r
IN EFI_SYSTEM_TABLE *SystemTable\r
)\r
UINTN StackIndex;\r
\r
//\r
- // Get the EBC entry point from the processor register. Make sure you don't\r
- // call any functions before this or you could mess up the register the\r
- // entry point is passed in.\r
+ // Get the EBC entry point\r
//\r
- Addr = EbcLLGetEbcEntryPoint ();\r
+ Addr = EntryPoint;\r
\r
- //\r
- // Print(L"*** Thunked into EBC entry point - ImageHandle = 0x%X\n", (UINTN)ImageHandle);\r
- // Print(L"EBC entry point is 0x%X\n", (UINT32)(UINTN)Addr);\r
//\r
// Now clear out our context\r
//\r
//\r
// Begin executing the EBC code\r
//\r
+ EbcDebuggerHookExecuteEbcImageEntryPoint (&VmContext);\r
EbcExecute (&VmContext);\r
\r
//\r
- // Return the value in R[7] unless there was an error\r
+ // Return the value in Gpr[7] unless there was an error\r
//\r
+ ReturnEBCStack(StackIndex);\r
return (UINT64) VmContext.Gpr[7];\r
}\r
\r
UINT8 *Ptr;\r
UINT8 *ThunkBase;\r
UINT32 Index;\r
- UINT32 Addr;\r
- INT32 Size;\r
INT32 ThunkSize;\r
\r
//\r
return EFI_INVALID_PARAMETER;\r
}\r
\r
- Size = EBC_THUNK_SIZE;\r
- ThunkSize = Size;\r
+ ThunkSize = sizeof(mInstructionBufferTemplate);\r
\r
- Ptr = AllocatePool (Size);\r
+ Ptr = EbcAllocatePoolForThunk (sizeof(mInstructionBufferTemplate));\r
\r
if (Ptr == NULL) {\r
return EFI_OUT_OF_RESOURCES;\r
*Thunk = (VOID *) Ptr;\r
\r
//\r
- // Add a magic code here to help the VM recognize the thunk..\r
- // mov eax, 0xca112ebc => B8 BC 2E 11 CA\r
+ // Copy whole thunk instruction buffer template\r
//\r
- *Ptr = 0xB8;\r
- Ptr++;\r
- Size--;\r
- Addr = (UINT32) 0xCA112EBC;\r
- for (Index = 0; Index < sizeof (Addr); Index++) {\r
- *Ptr = (UINT8) (UINTN) Addr;\r
- Addr >>= 8;\r
- Ptr++;\r
- Size--;\r
- }\r
+ CopyMem (Ptr, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate));\r
\r
//\r
- // Add code bytes to load up a processor register with the EBC entry point.\r
- // mov eax, 0xaa55aa55 => B8 55 AA 55 AA\r
- // The first 8 bytes of the thunk entry is the address of the EBC\r
- // entry point.\r
+ // Patch EbcEntryPoint and EbcLLEbcInterpret\r
//\r
- *Ptr = 0xB8;\r
- Ptr++;\r
- Size--;\r
- Addr = (UINT32) EbcEntryPoint;\r
- for (Index = 0; Index < sizeof (Addr); Index++) {\r
- *Ptr = (UINT8) (UINTN) Addr;\r
- Addr >>= 8;\r
- Ptr++;\r
- Size--;\r
- }\r
- //\r
- // Stick in a load of ecx with the address of appropriate VM function.\r
- // mov ecx 12345678h => 0xB9 0x78 0x56 0x34 0x12\r
- //\r
- if ((Flags & FLAG_THUNK_ENTRY_POINT) != 0) {\r
- Addr = (UINT32) (UINTN) ExecuteEbcImageEntryPoint;\r
- } else {\r
- Addr = (UINT32) (UINTN) EbcInterpret;\r
+ for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {\r
+ if (*(UINTN *)&Ptr[Index] == EBC_ENTRYPOINT_SIGNATURE) {\r
+ *(UINTN *)&Ptr[Index] = (UINTN)EbcEntryPoint;\r
+ }\r
+ if (*(UINTN *)&Ptr[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {\r
+ if ((Flags & FLAG_THUNK_ENTRY_POINT) != 0) {\r
+ *(UINTN *)&Ptr[Index] = (UINTN)EbcLLExecuteEbcImageEntryPoint;\r
+ } else {\r
+ *(UINTN *)&Ptr[Index] = (UINTN)EbcLLEbcInterpret;\r
+ }\r
+ }\r
}\r
\r
- //\r
- // MOV ecx\r
- //\r
- *Ptr = 0xB9;\r
- Ptr++;\r
- Size--;\r
- for (Index = 0; Index < sizeof (Addr); Index++) {\r
- *Ptr = (UINT8) Addr;\r
- Addr >>= 8;\r
- Ptr++;\r
- Size--;\r
- }\r
- //\r
- // Stick in jump opcode bytes for jmp ecx => 0xFF 0xE1\r
- //\r
- *Ptr = 0xFF;\r
- Ptr++;\r
- Size--;\r
- *Ptr = 0xE1;\r
- Size--;\r
-\r
- //\r
- // Double check that our defined size is ok (application error)\r
- //\r
- if (Size < 0) {\r
- ASSERT (FALSE);\r
- return EFI_BUFFER_TOO_SMALL;\r
- }\r
//\r
// Add the thunk to the list for this image. Do this last since the add\r
// function flushes the cache for us.\r
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