diff options
Diffstat (limited to 'MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c')
| -rw-r--r-- | MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c | 545 |
1 files changed, 545 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c b/MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c new file mode 100644 index 0000000..a534e00 --- /dev/null +++ b/MdeModulePkg/Universal/EbcDxe/Ia32/EbcSupport.c @@ -0,0 +1,545 @@ +/*++
+
+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 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 * 4)
+#define EBC_THUNK_SIZE 32
+
+#define STACK_REMAIN_SIZE (1024 * 4)
+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) != 0xB8) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 1) != 0xBC) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 2) != 0x2E) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 3) != 0x11) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 4) != 0xCA) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 5) != 0xB8) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 10) != 0xB9) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 15) != 0xFF) {
+ IsThunk = 0;
+ goto Action;
+ }
+ if (*((UINT8 *)FuncAddr + 16) != 0xE1) {
+ IsThunk = 0;
+ goto Action;
+ }
+
+ TargetEbcAddr = ((UINTN)(*((UINT8 *)FuncAddr + 9)) << 24) + ((UINTN)(*((UINT8 *)FuncAddr + 8)) << 16) +
+ ((UINTN)(*((UINT8 *)FuncAddr + 7)) << 8) + ((UINTN)(*((UINT8 *)FuncAddr + 6)));
+
+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) (UINTN) (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;
+ }
+}
+
+STATIC
+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
+ )
+/*++
+
+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:
+
+ None. Since we're called from a fixed up thunk (which we want to keep
+ small), our only so-called argument is the EBC entry point passed in
+ to us in a processor register.
+
+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.
+ //
+ 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.
+ //
+
+ //
+ // Align the stack on a natural boundary
+ //
+
+ //
+ // Allocate stack pool
+ //
+ Status = GetEBCStack((EFI_HANDLE)-1, &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) - 1);
+ 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];
+ VmContext.LowStackTop = (UINTN) VmContext.R[0];
+
+ //
+ // For IA32, this is where we say our return address is
+ //
+ VmContext.R[0] -= sizeof (UINTN);
+ *(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;
+}
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