diff options
Diffstat (limited to 'EdkModulePkg/Universal/Ebc/Dxe/x64')
| -rw-r--r-- | EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S | 144 | ||||
| -rw-r--r-- | EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.asm | 154 | ||||
| -rw-r--r-- | EdkModulePkg/Universal/Ebc/Dxe/x64/EbcSupport.c | 619 |
3 files changed, 0 insertions, 917 deletions
diff --git a/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S b/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S deleted file mode 100644 index d9f638643a..0000000000 --- a/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S +++ /dev/null @@ -1,144 +0,0 @@ -#**************************************************************************** -#* -#* Copyright (c) 2006, Intel Corporation -#* 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. -#* -#**************************************************************************** -#**************************************************************************** -# REV 1.0 -#**************************************************************************** -# -# Rev Date Description -# --- -------- ------------------------------------------------------------ -# 1.0 05/09/12 Initial creation of file. -# -#**************************************************************************** - -#* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -# This code provides low level routines that support the Virtual Machine -# for option ROMs. -#* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * - -#--------------------------------------------------------------------------- -# 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/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.asm b/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.asm deleted file mode 100644 index 7b59e93aa1..0000000000 --- a/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.asm +++ /dev/null @@ -1,154 +0,0 @@ - page ,132
- title VM ASSEMBLY LANGUAGE ROUTINES
-;****************************************************************************
-;*
-;* Copyright (c) 2006, Intel Corporation
-;* 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.
-;*
-;****************************************************************************
-;****************************************************************************
-; REV 1.0
-;****************************************************************************
-;
-; Rev Date Description
-; --- -------- ------------------------------------------------------------
-; 1.0 05/09/12 Initial creation of file.
-;
-;****************************************************************************
-
-;* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
-; This code provides low level routines that support the Virtual Machine
-; for option ROMs.
-;* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
-
-;---------------------------------------------------------------------------
-; 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 NEAR 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 NEAR 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 NEAR 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 NEAR PUBLIC
- ret
-EbcLLGetReturnValue ENDP
-
-text ENDS
-END
-
diff --git a/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcSupport.c b/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcSupport.c deleted file mode 100644 index bec82d67c5..0000000000 --- a/EdkModulePkg/Universal/Ebc/Dxe/x64/EbcSupport.c +++ /dev/null @@ -1,619 +0,0 @@ -/*++
-
-Copyright (c) 2006, Intel Corporation
-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.
-
-Module Name:
-
- EbcSupport.c
-
-Abstract:
-
- This module contains EBC support routines that are customized based on
- the target x64 processor.
-
---*/
-
-#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)
-
-STATIC
-VOID
-PushU64 (
- VM_CONTEXT *VmPtr,
- UINT64 Arg
- )
-/*++
-
-Routine Description:
-
- Push a 64 bit unsigned value to the VM stack.
-
-Arguments:
-
- VmPtr - The pointer to current VM context.
- Arg - The value to be pushed
-
-Returns:
-
- VOID
-
---*/
-{
- //
- // 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;
-}
-
-STATIC
-UINT64
-EbcInterpret (
- UINTN Arg1,
- UINTN Arg2,
- UINTN Arg3,
- UINTN Arg4,
- UINTN Arg5,
- UINTN Arg6,
- UINTN Arg7,
- UINTN Arg8,
- UINTN Arg9,
- UINTN Arg10,
- UINTN Arg11,
- UINTN Arg12,
- UINTN Arg13,
- UINTN Arg14,
- UINTN Arg15,
- UINTN Arg16
- )
-/*++
-
-Routine Description:
-
- 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.
-
-Arguments:
-
- 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.
-
-Returns:
-
- The value returned by the EBC application we're going to run.
-
---*/
-{
- //
- // 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];
-}
-
-STATIC
-UINT64
-ExecuteEbcImageEntryPoint (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
-/*++
-
-Routine Description:
-
- 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.
-
-Arguments:
-
- ImageHandle - image handle for the EBC application we're executing
- SystemTable - standard system table passed into an driver's entry point
-
-Returns:
-
- The value returned by the EBC application we're going to run.
-
---*/
-{
- //
- // 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];
-}
-
-EFI_STATUS
-EbcCreateThunks (
- IN EFI_HANDLE ImageHandle,
- IN VOID *EbcEntryPoint,
- OUT VOID **Thunk,
- IN UINT32 Flags
- )
-/*++
-
-Routine Description:
-
- Create an IA32 thunk for the given EBC entry point.
-
-Arguments:
-
- ImageHandle - Handle of image for which this thunk is being created
- EbcEntryPoint - Address of the EBC code that the thunk is to call
- Thunk - Returned thunk we create here
-
-Returns:
-
- Standard EFI status.
-
---*/
-{
- UINT8 *Ptr;
- UINT8 *ThunkBase;
- UINT32 I;
- 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 (I = 0; I < sizeof (Addr); I++) {
- *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 (I = 0; I < sizeof (Addr); I++) {
- *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) {
- Addr = (UINTN) ExecuteEbcImageEntryPoint;
- } else {
- Addr = (UINTN) EbcInterpret;
- }
-
- //
- // mov r11 Addr => 0x49 0xBB
- //
- *Ptr = 0x49;
- Ptr++;
- Size--;
- *Ptr = 0xBB;
- Ptr++;
- Size--;
- for (I = 0; I < sizeof (Addr); I++) {
- *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;
-}
-
-VOID
-EbcLLCALLEX (
- IN VM_CONTEXT *VmPtr,
- IN UINTN FuncAddr,
- IN UINTN NewStackPointer,
- IN VOID *FramePtr,
- IN UINT8 Size
- )
-/*++
-
-Routine Description:
-
- 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.
-
-Arguments:
-
- VmPtr - Pointer to a VM context.
- FuncAddr - Callee's address
- NewStackPointer - New stack pointer after the call
- FramePtr - New frame pointer after the call
- Size - The size of call instruction
-
-Returns:
-
- None.
-
---*/
-{
- 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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