Adjust directory structures.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3325 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8
545
MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c
Normal file
545
MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c
Normal file
@@ -0,0 +1,545 @@
|
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/*++
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Copyright (c) 2006, Intel Corporation
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||||
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
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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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Module Name:
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||||
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EbcSupport.c
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Abstract:
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This module contains EBC support routines that are customized based on
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the target processor.
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--*/
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#include "EbcInt.h"
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#include "EbcExecute.h"
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//
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// NOTE: This is the stack size allocated for the interpreter
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// when it executes an EBC image. The requirements can change
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// based on whether or not a debugger is present, and other
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// platform-specific configurations.
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//
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#define VM_STACK_SIZE (1024 * 4)
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#define EBC_THUNK_SIZE 32
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#define STACK_REMAIN_SIZE (1024 * 4)
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VOID
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EbcLLCALLEX (
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IN VM_CONTEXT *VmPtr,
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IN UINTN FuncAddr,
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IN UINTN NewStackPointer,
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IN VOID *FramePtr,
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IN UINT8 Size
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||||
)
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/*++
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||||
|
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Routine Description:
|
||||
|
||||
This function is called to execute an EBC CALLEX instruction.
|
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The function check the callee's content to see whether it is common native
|
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code or a thunk to another piece of EBC code.
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If the callee is common native code, use EbcLLCAllEXASM to manipulate,
|
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otherwise, set the VM->IP to target EBC code directly to avoid another VM
|
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be startup which cost time and stack space.
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|
||||
Arguments:
|
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|
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VmPtr - Pointer to a VM context.
|
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FuncAddr - Callee's address
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NewStackPointer - New stack pointer after the call
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FramePtr - New frame pointer after the call
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||||
Size - The size of call instruction
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|
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Returns:
|
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None.
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|
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--*/
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{
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UINTN IsThunk;
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UINTN TargetEbcAddr;
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IsThunk = 1;
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TargetEbcAddr = 0;
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//
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// Processor specific code to check whether the callee is a thunk to EBC.
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//
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if (*((UINT8 *)FuncAddr) != 0xB8) {
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IsThunk = 0;
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goto Action;
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}
|
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if (*((UINT8 *)FuncAddr + 1) != 0xBC) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 2) != 0x2E) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 3) != 0x11) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 4) != 0xCA) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 5) != 0xB8) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 10) != 0xB9) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 15) != 0xFF) {
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IsThunk = 0;
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goto Action;
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}
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if (*((UINT8 *)FuncAddr + 16) != 0xE1) {
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IsThunk = 0;
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goto Action;
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}
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TargetEbcAddr = ((UINTN)(*((UINT8 *)FuncAddr + 9)) << 24) + ((UINTN)(*((UINT8 *)FuncAddr + 8)) << 16) +
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((UINTN)(*((UINT8 *)FuncAddr + 7)) << 8) + ((UINTN)(*((UINT8 *)FuncAddr + 6)));
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Action:
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if (IsThunk == 1){
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//
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// The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and
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// put our return address and frame pointer on the VM stack.
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// Then set the VM's IP to new EBC code.
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//
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VmPtr->R[0] -= 8;
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VmWriteMemN (VmPtr, (UINTN) VmPtr->R[0], (UINTN) FramePtr);
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VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->R[0];
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VmPtr->R[0] -= 8;
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VmWriteMem64 (VmPtr, (UINTN) VmPtr->R[0], (UINT64) (UINTN) (VmPtr->Ip + Size));
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VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;
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} else {
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//
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// The callee is not a thunk to EBC, call native code.
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//
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EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);
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//
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// Get return value and advance the IP.
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//
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VmPtr->R[7] = EbcLLGetReturnValue ();
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VmPtr->Ip += Size;
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}
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}
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STATIC
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UINT64
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EbcInterpret (
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IN OUT UINTN Arg1,
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IN OUT UINTN Arg2,
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IN OUT UINTN Arg3,
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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,
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IN OUT UINTN Arg12,
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IN OUT UINTN Arg13,
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||||
IN OUT UINTN Arg14,
|
||||
IN OUT UINTN Arg15,
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IN OUT UINTN Arg16
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||||
)
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/*++
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Routine Description:
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Begin executing an EBC image. The address of the entry point is passed
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in via a processor register, so we'll need to make a call to get the
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||||
value.
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||||
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||||
Arguments:
|
||||
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None. Since we're called from a fixed up thunk (which we want to keep
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small), our only so-called argument is the EBC entry point passed in
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to us in a processor register.
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||||
|
||||
Returns:
|
||||
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||||
The value returned by the EBC application we're going to run.
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||||
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||||
--*/
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{
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||||
//
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||||
// Create a new VM context on the stack
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||||
//
|
||||
VM_CONTEXT VmContext;
|
||||
UINTN Addr;
|
||||
EFI_STATUS Status;
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||||
UINTN StackIndex;
|
||||
|
||||
//
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||||
// Get the EBC entry point from the processor register.
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//
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Addr = EbcLLGetEbcEntryPoint ();
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||||
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//
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||||
// Now clear out our context
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||||
//
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||||
ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));
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||||
//
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// Set the VM instruction pointer to the correct location in memory.
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||||
//
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||||
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.
|
||||
//
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||||
|
||||
//
|
||||
// Align the stack on a natural boundary
|
||||
//
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||||
|
||||
//
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||||
// Allocate stack pool
|
||||
//
|
||||
Status = GetEBCStack((EFI_HANDLE)-1, &VmContext.StackPool, &StackIndex);
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||||
if (EFI_ERROR(Status)) {
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||||
return Status;
|
||||
}
|
||||
VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
|
||||
VmContext.R[0] = (UINT64)(UINTN) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
|
||||
VmContext.HighStackBottom = (UINTN)VmContext.R[0];
|
||||
VmContext.R[0] &= ~(sizeof (UINTN) - 1);
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
|
||||
//
|
||||
// Put a magic value in the stack gap, then adjust down again
|
||||
//
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||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) VM_STACK_KEY_VALUE;
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||||
VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.R[0];
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||||
VmContext.LowStackTop = (UINTN) VmContext.R[0];
|
||||
|
||||
//
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||||
// For IA32, this is where we say our return address is
|
||||
//
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VmContext.R[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg16;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg15;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg14;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg13;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg12;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg11;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg10;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg9;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg8;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg7;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg6;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg5;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg4;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg3;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg2;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) Arg1;
|
||||
VmContext.R[0] -= 16;
|
||||
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 ();
|
||||
|
||||
//
|
||||
// Print(L"*** Thunked into EBC entry point - ImageHandle = 0x%X\n", (UINTN)ImageHandle);
|
||||
// Print(L"EBC entry point is 0x%X\n", (UINT32)(UINTN)Addr);
|
||||
//
|
||||
// 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.
|
||||
//
|
||||
|
||||
//
|
||||
// Allocate stack pool
|
||||
//
|
||||
Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);
|
||||
if (EFI_ERROR(Status)) {
|
||||
return Status;
|
||||
}
|
||||
VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
|
||||
VmContext.R[0] = (UINT64)(UINTN) ((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];
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) SystemTable;
|
||||
VmContext.R[0] -= sizeof (UINTN);
|
||||
*(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) ImageHandle;
|
||||
|
||||
VmContext.R[0] -= 16;
|
||||
VmContext.StackRetAddr = (UINT64) VmContext.R[0];
|
||||
//
|
||||
// VM pushes 16-bytes for return address. Simulate that here.
|
||||
//
|
||||
|
||||
//
|
||||
// Begin executing the EBC code
|
||||
//
|
||||
EbcExecute (&VmContext);
|
||||
|
||||
//
|
||||
// Return the value in R[7] unless there was an error
|
||||
//
|
||||
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;
|
||||
UINT32 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 eax, 0xca112ebc => B8 BC 2E 11 CA
|
||||
//
|
||||
*Ptr = 0xB8;
|
||||
Ptr++;
|
||||
Size--;
|
||||
Addr = (UINT32) 0xCA112EBC;
|
||||
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 eax, 0xaa55aa55 => B8 55 AA 55 AA
|
||||
// The first 8 bytes of the thunk entry is the address of the EBC
|
||||
// entry point.
|
||||
//
|
||||
*Ptr = 0xB8;
|
||||
Ptr++;
|
||||
Size--;
|
||||
Addr = (UINT32) 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.
|
||||
// mov ecx 12345678h => 0xB9 0x78 0x56 0x34 0x12
|
||||
//
|
||||
if (Flags & FLAG_THUNK_ENTRY_POINT) {
|
||||
Addr = (UINT32) (UINTN) ExecuteEbcImageEntryPoint;
|
||||
} else {
|
||||
Addr = (UINT32) (UINTN) EbcInterpret;
|
||||
}
|
||||
|
||||
//
|
||||
// MOV ecx
|
||||
//
|
||||
*Ptr = 0xB9;
|
||||
Ptr++;
|
||||
Size--;
|
||||
for (I = 0; I < sizeof (Addr); I++) {
|
||||
*Ptr = (UINT8) Addr;
|
||||
Addr >>= 8;
|
||||
Ptr++;
|
||||
Size--;
|
||||
}
|
||||
//
|
||||
// Stick in jump opcode bytes for jmp ecx => 0xFF 0xE1
|
||||
//
|
||||
*Ptr = 0xFF;
|
||||
Ptr++;
|
||||
Size--;
|
||||
*Ptr = 0xE1;
|
||||
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;
|
||||
}
|
||||
Reference in New Issue
Block a user