diff options
| author | qhuang8 <qhuang8@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-05-21 04:07:30 +0000 |
|---|---|---|
| committer | qhuang8 <qhuang8@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-05-21 04:07:30 +0000 |
| commit | 955723bd63265fe6a6517a8995225c5fe3c91aff (patch) | |
| tree | e4e39c384445feaadcc13bb4712796423af29a89 /MdeModulePkg/Universal/EbcDxe/X64 | |
| parent | f45af90b0195eb9712609d3af91d523edc371115 (diff) | |
| download | edk2-platforms-955723bd63265fe6a6517a8995225c5fe3c91aff.tar.xz | |
Use "X64" for directory name to follow directory name convention.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5258 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/Universal/EbcDxe/X64')
| -rw-r--r-- | MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.S | 133 | ||||
| -rw-r--r-- | MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm | 144 | ||||
| -rw-r--r-- | MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c | 600 |
3 files changed, 877 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.S b/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.S new file mode 100644 index 0000000000..aa7024b3e0 --- /dev/null +++ b/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.S @@ -0,0 +1,133 @@ +#/** @file
+#
+# This code provides low level routines that support the Virtual Machine
+# for option ROMs.
+#
+# Copyright (c) 2007 - 2008, Intel Corporation. <BR>
+# All rights reserved. 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.
+#
+#**/
+
+#---------------------------------------------------------------------------
+# Equate files needed.
+#---------------------------------------------------------------------------
+
+#---------------------------------------------------------------------------
+##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.
+#****************************************************************************
+.global _CopyMem;
+
+# VOID EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)
+.global _EbcLLCALLEXNative;
+_EbcLLCALLEXNative:
+ push %rbp
+ push %rbx
+ mov %rsp, %rbp
+ # Function prolog
+
+ # Copy FuncAddr to a preserved register.
+ mov %rcx, %rbx
+
+ # Set stack pointer to new value
+ sub %r8, %rdx
+ sub %rsp, %r8
+ mov %rsp, %rcx
+ sub %rsp, 0x20
+ call _CopyMem
+ add %rsp, 0x20
+
+ # Considering the worst case, load 4 potiential arguments
+ # into registers.
+ mov (%rsp), %rcx
+ mov 8(%rsp), %rdx
+ mov 10(%rsp), %r8
+ mov 18(%rsp), %r9
+
+ # Now call the external routine
+ call *%rbx
+
+ # Function epilog
+ mov %rbp, %rsp
+ pop %rbx
+ pop %rbp
+ ret
+
+
+# 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.
+#
+.global _EbcLLGetEbcEntryPoint;
+_EbcLLGetEbcEntryPoint:
+ ret
+
+#/*++
+#
+#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()
+.global _EbcLLGetStackPointer;
+_EbcLLGetStackPointer:
+ mov %rsp, %rax
+ # Stack adjusted by this much when we were called,
+ # For this function, it's 4.
+ add $4, %rax
+ ret
+
+.global _EbcLLGetReturnValue;
+_EbcLLGetReturnValue:
+# 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.
+#
+ ret
diff --git a/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm b/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm new file mode 100644 index 0000000000..6741405cbc --- /dev/null +++ b/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm @@ -0,0 +1,144 @@ +;/** @file
+;
+; This code provides low level routines that support the Virtual Machine.
+; for option ROMs.
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. <BR>
+; All rights reserved. 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
+ 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
+
diff --git a/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c b/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c new file mode 100644 index 0000000000..2a01c89245 --- /dev/null +++ b/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c @@ -0,0 +1,600 @@ +/** @file
+ This module contains EBC support routines that are customized based on
+ the target x64 processor.
+
+Copyright (c) 2006 - 2008, Intel Corporation. <BR>
+All rights reserved. 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.
+
+**/
+
+#include "EbcInt.h"
+#include "EbcExecute.h"
+
+//
+// NOTE: This is the stack size allocated for the interpreter
+// when it executes an EBC image. The requirements can change
+// based on whether or not a debugger is present, and other
+// platform-specific configurations.
+//
+#define VM_STACK_SIZE (1024 * 8)
+#define EBC_THUNK_SIZE 64
+
+#define STACK_REMAIN_SIZE (1024 * 4)
+
+
+/**
+ Pushes a 64 bit unsigned value to the VM stack.
+
+ @param VmPtr The pointer to current VM context.
+ @param Arg The value to be pushed.
+
+**/
+VOID
+PushU64 (
+ IN VM_CONTEXT *VmPtr,
+ IN UINT64 Arg
+ )
+{
+ //
+ // Advance the VM stack down, and then copy the argument to the stack.
+ // Hope it's aligned.
+ //
+ VmPtr->R[0] -= sizeof (UINT64);
+ *(UINT64 *) VmPtr->R[0] = Arg;
+ return;
+}
+
+
+/**
+ Begin executing an EBC image. The address of the entry point is passed
+ in via a processor register, so we'll need to make a call to get the
+ value.
+
+ This is a thunk function. Microsoft x64 compiler only provide fast_call
+ calling convention, so the first four arguments are passed by rcx, rdx,
+ r8, and r9, while other arguments are passed in stack.
+
+ @param Arg1 The 1st argument.
+ @param Arg2 The 2nd argument.
+ @param Arg3 The 3rd argument.
+ @param Arg4 The 4th argument.
+ @param Arg5 The 5th argument.
+ @param Arg6 The 6th argument.
+ @param Arg7 The 7th argument.
+ @param Arg8 The 8th argument.
+ @param Arg9 The 9th argument.
+ @param Arg10 The 10th argument.
+ @param Arg11 The 11th argument.
+ @param Arg12 The 12th argument.
+ @param Arg13 The 13th argument.
+ @param Arg14 The 14th argument.
+ @param Arg15 The 15th argument.
+ @param Arg16 The 16th argument.
+
+ @return The value returned by the EBC application we're going to run.
+
+**/
+UINT64
+EbcInterpret (
+ IN OUT UINTN Arg1,
+ IN OUT UINTN Arg2,
+ IN OUT UINTN Arg3,
+ IN OUT UINTN Arg4,
+ IN OUT UINTN Arg5,
+ IN OUT UINTN Arg6,
+ IN OUT UINTN Arg7,
+ IN OUT UINTN Arg8,
+ IN OUT UINTN Arg9,
+ IN OUT UINTN Arg10,
+ IN OUT UINTN Arg11,
+ IN OUT UINTN Arg12,
+ IN OUT UINTN Arg13,
+ IN OUT UINTN Arg14,
+ IN OUT UINTN Arg15,
+ IN OUT UINTN Arg16
+ )
+{
+ //
+ // Create a new VM context on the stack
+ //
+ VM_CONTEXT VmContext;
+ UINTN Addr;
+ EFI_STATUS Status;
+ UINTN StackIndex;
+
+ //
+ // Get the EBC entry point from the processor register.
+ // Don't call any function before getting the EBC entry
+ // point because this will collab the return register.
+ //
+ Addr = EbcLLGetEbcEntryPoint ();
+
+ //
+ // Now clear out our context
+ //
+ ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));
+
+ //
+ // Set the VM instruction pointer to the correct location in memory.
+ //
+ VmContext.Ip = (VMIP) Addr;
+
+ //
+ // Initialize the stack pointer for the EBC. Get the current system stack
+ // pointer and adjust it down by the max needed for the interpreter.
+ //
+ Addr = EbcLLGetStackPointer ();
+
+ //
+ // Adjust the VM's stack pointer down.
+ //
+
+ Status = GetEBCStack((EFI_HANDLE)(UINTN)-1, &VmContext.StackPool, &StackIndex);
+ if (EFI_ERROR(Status)) {
+ return Status;
+ }
+ VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
+ VmContext.R[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
+ VmContext.HighStackBottom = (UINTN) VmContext.R[0];
+ VmContext.R[0] -= sizeof (UINTN);
+
+ //
+ // Align the stack on a natural boundary.
+ //
+ VmContext.R[0] &= ~(sizeof (UINTN) - 1);
+
+ //
+ // Put a magic value in the stack gap, then adjust down again.
+ //
+ *(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) VM_STACK_KEY_VALUE;
+ VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.R[0];
+
+ //
+ // The stack upper to LowStackTop is belong to the VM.
+ //
+ VmContext.LowStackTop = (UINTN) VmContext.R[0];
+
+ //
+ // For the worst case, assume there are 4 arguments passed in registers, store
+ // them to VM's stack.
+ //
+ PushU64 (&VmContext, (UINT64) Arg16);
+ PushU64 (&VmContext, (UINT64) Arg15);
+ PushU64 (&VmContext, (UINT64) Arg14);
+ PushU64 (&VmContext, (UINT64) Arg13);
+ PushU64 (&VmContext, (UINT64) Arg12);
+ PushU64 (&VmContext, (UINT64) Arg11);
+ PushU64 (&VmContext, (UINT64) Arg10);
+ PushU64 (&VmContext, (UINT64) Arg9);
+ PushU64 (&VmContext, (UINT64) Arg8);
+ PushU64 (&VmContext, (UINT64) Arg7);
+ PushU64 (&VmContext, (UINT64) Arg6);
+ PushU64 (&VmContext, (UINT64) Arg5);
+ PushU64 (&VmContext, (UINT64) Arg4);
+ PushU64 (&VmContext, (UINT64) Arg3);
+ PushU64 (&VmContext, (UINT64) Arg2);
+ PushU64 (&VmContext, (UINT64) Arg1);
+
+ //
+ // Interpreter assumes 64-bit return address is pushed on the stack.
+ // The x64 does not do this so pad the stack accordingly.
+ //
+ PushU64 (&VmContext, (UINT64) 0);
+ PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);
+
+ //
+ // For x64, this is where we say our return address is
+ //
+ VmContext.StackRetAddr = (UINT64) VmContext.R[0];
+
+ //
+ // We need to keep track of where the EBC stack starts. This way, if the EBC
+ // accesses any stack variables above its initial stack setting, then we know
+ // it's accessing variables passed into it, which means the data is on the
+ // VM's stack.
+ // When we're called, on the stack (high to low) we have the parameters, the
+ // return address, then the saved ebp. Save the pointer to the return address.
+ // EBC code knows that's there, so should look above it for function parameters.
+ // The offset is the size of locals (VMContext + Addr + saved ebp).
+ // Note that the interpreter assumes there is a 16 bytes of return address on
+ // the stack too, so adjust accordingly.
+ // VmContext.HighStackBottom = (UINTN)(Addr + sizeof (VmContext) + sizeof (Addr));
+ //
+
+ //
+ // Begin executing the EBC code
+ //
+ EbcExecute (&VmContext);
+
+ //
+ // Return the value in R[7] unless there was an error
+ //
+ ReturnEBCStack(StackIndex);
+ return (UINT64) VmContext.R[7];
+}
+
+
+/**
+ Begin executing an EBC image. The address of the entry point is passed
+ in via a processor register, so we'll need to make a call to get the
+ value.
+
+ @param ImageHandle image handle for the EBC application we're executing
+ @param SystemTable standard system table passed into an driver's entry
+ point
+
+ @return The value returned by the EBC application we're going to run.
+
+**/
+UINT64
+ExecuteEbcImageEntryPoint (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ //
+ // Create a new VM context on the stack
+ //
+ VM_CONTEXT VmContext;
+ UINTN Addr;
+ EFI_STATUS Status;
+ UINTN StackIndex;
+
+ //
+ // Get the EBC entry point from the processor register. Make sure you don't
+ // call any functions before this or you could mess up the register the
+ // entry point is passed in.
+ //
+ Addr = EbcLLGetEbcEntryPoint ();
+
+ //
+ // Now clear out our context
+ //
+ ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));
+
+ //
+ // Save the image handle so we can track the thunks created for this image
+ //
+ VmContext.ImageHandle = ImageHandle;
+ VmContext.SystemTable = SystemTable;
+
+ //
+ // Set the VM instruction pointer to the correct location in memory.
+ //
+ VmContext.Ip = (VMIP) Addr;
+
+ //
+ // Initialize the stack pointer for the EBC. Get the current system stack
+ // pointer and adjust it down by the max needed for the interpreter.
+ //
+ Addr = EbcLLGetStackPointer ();
+
+ Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);
+ if (EFI_ERROR(Status)) {
+ return Status;
+ }
+ VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
+ VmContext.R[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
+ VmContext.HighStackBottom = (UINTN) VmContext.R[0];
+ VmContext.R[0] -= sizeof (UINTN);
+
+
+ //
+ // Put a magic value in the stack gap, then adjust down again
+ //
+ *(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) VM_STACK_KEY_VALUE;
+ VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.R[0];
+
+ //
+ // Align the stack on a natural boundary
+ VmContext.R[0] &= ~(sizeof(UINTN) - 1);
+ //
+ VmContext.LowStackTop = (UINTN) VmContext.R[0];
+
+ //
+ // Simply copy the image handle and system table onto the EBC stack.
+ // Greatly simplifies things by not having to spill the args.
+ //
+ PushU64 (&VmContext, (UINT64) SystemTable);
+ PushU64 (&VmContext, (UINT64) ImageHandle);
+
+ //
+ // VM pushes 16-bytes for return address. Simulate that here.
+ //
+ PushU64 (&VmContext, (UINT64) 0);
+ PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);
+
+ //
+ // For x64, this is where we say our return address is
+ //
+ VmContext.StackRetAddr = (UINT64) VmContext.R[0];
+
+ //
+ // Entry function needn't access high stack context, simply
+ // put the stack pointer here.
+ //
+
+ //
+ // Begin executing the EBC code
+ //
+ EbcExecute (&VmContext);
+
+ //
+ // Return the value in R[7] unless there was an error
+ //
+ ReturnEBCStack(StackIndex);
+ return (UINT64) VmContext.R[7];
+}
+
+
+/**
+ Create thunks for an EBC image entry point, or an EBC protocol service.
+
+ @param ImageHandle Image handle for the EBC image. If not null, then
+ we're creating a thunk for an image entry point.
+ @param EbcEntryPoint Address of the EBC code that the thunk is to call
+ @param Thunk Returned thunk we create here
+ @param Flags Flags indicating options for creating the thunk
+
+ @retval EFI_SUCCESS The thunk was created successfully.
+ @retval EFI_INVALID_PARAMETER The parameter of EbcEntryPoint is not 16-bit
+ aligned.
+ @retval EFI_OUT_OF_RESOURCES There is not enough memory to created the EBC
+ Thunk.
+ @retval EFI_BUFFER_TOO_SMALL EBC_THUNK_SIZE is not larger enough.
+
+**/
+EFI_STATUS
+EbcCreateThunks (
+ IN EFI_HANDLE ImageHandle,
+ IN VOID *EbcEntryPoint,
+ OUT VOID **Thunk,
+ IN UINT32 Flags
+ )
+{
+ UINT8 *Ptr;
+ UINT8 *ThunkBase;
+ UINT32 Index;
+ UINT64 Addr;
+ INT32 Size;
+ INT32 ThunkSize;
+
+ //
+ // Check alignment of pointer to EBC code
+ //
+ if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Size = EBC_THUNK_SIZE;
+ ThunkSize = Size;
+
+ Ptr = AllocatePool (Size);
+
+ if (Ptr == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ //
+ // Print(L"Allocate TH: 0x%X\n", (UINT32)Ptr);
+ //
+ // Save the start address so we can add a pointer to it to a list later.
+ //
+ ThunkBase = Ptr;
+
+ //
+ // Give them the address of our buffer we're going to fix up
+ //
+ *Thunk = (VOID *) Ptr;
+
+ //
+ // Add a magic code here to help the VM recognize the thunk..
+ // mov rax, ca112ebccall2ebch => 48 B8 BC 2E 11 CA BC 2E 11 CA
+ //
+ *Ptr = 0x48;
+ Ptr++;
+ Size--;
+ *Ptr = 0xB8;
+ Ptr++;
+ Size--;
+ Addr = (UINT64) 0xCA112EBCCA112EBCULL;
+ for (Index = 0; Index < sizeof (Addr); Index++) {
+ *Ptr = (UINT8) (UINTN) Addr;
+ Addr >>= 8;
+ Ptr++;
+ Size--;
+ }
+
+ //
+ // Add code bytes to load up a processor register with the EBC entry point.
+ // mov rax, 123456789abcdef0h => 48 B8 F0 DE BC 9A 78 56 34 12
+ // The first 8 bytes of the thunk entry is the address of the EBC
+ // entry point.
+ //
+ *Ptr = 0x48;
+ Ptr++;
+ Size--;
+ *Ptr = 0xB8;
+ Ptr++;
+ Size--;
+ Addr = (UINT64) EbcEntryPoint;
+ for (Index = 0; Index < sizeof (Addr); Index++) {
+ *Ptr = (UINT8) (UINTN) Addr;
+ Addr >>= 8;
+ Ptr++;
+ Size--;
+ }
+
+ //
+ // Stick in a load of ecx with the address of appropriate VM function.
+ // Using r11 because it's a volatile register and won't be used in this
+ // point.
+ // mov r11 123456789abcdef0h => 49 BB F0 DE BC 9A 78 56 34 12
+ //
+ if ((Flags & FLAG_THUNK_ENTRY_POINT) != 0) {
+ Addr = (UINTN) ExecuteEbcImageEntryPoint;
+ } else {
+ Addr = (UINTN) EbcInterpret;
+ }
+
+ //
+ // mov r11 Addr => 0x49 0xBB
+ //
+ *Ptr = 0x49;
+ Ptr++;
+ Size--;
+ *Ptr = 0xBB;
+ Ptr++;
+ Size--;
+ for (Index = 0; Index < sizeof (Addr); Index++) {
+ *Ptr = (UINT8) Addr;
+ Addr >>= 8;
+ Ptr++;
+ Size--;
+ }
+ //
+ // Stick in jump opcode bytes for jmp r11 => 0x41 0xFF 0xE3
+ //
+ *Ptr = 0x41;
+ Ptr++;
+ Size--;
+ *Ptr = 0xFF;
+ Ptr++;
+ Size--;
+ *Ptr = 0xE3;
+ Size--;
+
+ //
+ // Double check that our defined size is ok (application error)
+ //
+ if (Size < 0) {
+ ASSERT (FALSE);
+ return EFI_BUFFER_TOO_SMALL;
+ }
+ //
+ // Add the thunk to the list for this image. Do this last since the add
+ // function flushes the cache for us.
+ //
+ EbcAddImageThunk (ImageHandle, (VOID *) ThunkBase, ThunkSize);
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ This function is called to execute an EBC CALLEX instruction.
+ The function check the callee's content to see whether it is common native
+ code or a thunk to another piece of EBC code.
+ If the callee is common native code, use EbcLLCAllEXASM to manipulate,
+ otherwise, set the VM->IP to target EBC code directly to avoid another VM
+ be startup which cost time and stack space.
+
+ @param VmPtr Pointer to a VM context.
+ @param FuncAddr Callee's address
+ @param NewStackPointer New stack pointer after the call
+ @param FramePtr New frame pointer after the call
+ @param Size The size of call instruction
+
+**/
+VOID
+EbcLLCALLEX (
+ IN VM_CONTEXT *VmPtr,
+ IN UINTN FuncAddr,
+ IN UINTN NewStackPointer,
+ IN VOID *FramePtr,
+ IN UINT8 Size
+ )
+{
+ UINTN IsThunk;
+ UINTN TargetEbcAddr;
+
+ IsThunk = 1;
+ TargetEbcAddr = 0;
+
+ //
+ // Processor specific code to check whether the callee is a thunk to EBC.
+ //
+ if (*((UINT8 *)FuncAddr) != 0x48) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 1) != 0xB8) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 2) != 0xBC) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 3) != 0x2E) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 4) != 0x11) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 5) != 0xCA) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 6) != 0xBC) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 7) != 0x2E) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 8) != 0x11) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 9) != 0xCA) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 10) != 0x48) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 11) != 0xB8) {
+ IsThunk = 0;
+ goto Action;
+ }
+
+ CopyMem (&TargetEbcAddr, (UINT8 *)FuncAddr + 12, 8);
+
+Action:
+ if (IsThunk == 1){
+ //
+ // The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and
+ // put our return address and frame pointer on the VM stack.
+ // Then set the VM's IP to new EBC code.
+ //
+ VmPtr->R[0] -= 8;
+ VmWriteMemN (VmPtr, (UINTN) VmPtr->R[0], (UINTN) FramePtr);
+ VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->R[0];
+ VmPtr->R[0] -= 8;
+ VmWriteMem64 (VmPtr, (UINTN) VmPtr->R[0], (UINT64) (VmPtr->Ip + Size));
+
+ VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;
+ } else {
+ //
+ // The callee is not a thunk to EBC, call native code.
+ //
+ EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);
+
+ //
+ // Get return value and advance the IP.
+ //
+ VmPtr->R[7] = EbcLLGetReturnValue ();
+ VmPtr->Ip += Size;
+ }
+}
+
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