Example #1
0
/**
  Begin executing an EBC image.

  @param  EntryPoint       The entrypoint of EBC code.
  @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
EFIAPI
ExecuteEbcImageEntryPoint (
  IN UINTN                EntryPoint,
  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
  //
  Addr = EntryPoint;

  //
  // 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.
  //

  Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);
  if (EFI_ERROR(Status)) {
    return Status;
  }
  VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
  VmContext.Gpr[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
  VmContext.HighStackBottom = (UINTN) VmContext.Gpr[0];
  VmContext.Gpr[0] -= sizeof (UINTN);


  //
  // Put a magic value in the stack gap, then adjust down again
  //
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;
  VmContext.StackMagicPtr             = (UINTN *) (UINTN) VmContext.Gpr[0];

  //
  // Align the stack on a natural boundary
  VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof(UINTN) - 1);
  //
  VmContext.LowStackTop   = (UINTN) VmContext.Gpr[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.Gpr[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.Gpr[7];
}
Example #2
0
/**
  Begin executing an EBC image.

  @param  EntryPoint       The entrypoint of EBC code.
  @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
EFIAPI
ExecuteEbcImageEntryPoint (
  IN UINTN                EntryPoint,
  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
  //
  Addr = EntryPoint;

  //
  // 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.Gpr[0] = (UINT64)(UINTN) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
  VmContext.HighStackBottom = (UINTN)VmContext.Gpr[0];
  VmContext.Gpr[0] -= sizeof (UINTN);

  //
  // Put a magic value in the stack gap, then adjust down again
  //
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;
  VmContext.StackMagicPtr             = (UINTN *) (UINTN) VmContext.Gpr[0];

  //
  // Align the stack on a natural boundary
  //  VmContext.Gpr[0] &= ~(sizeof(UINTN) - 1);
  //
  VmContext.LowStackTop   = (UINTN) VmContext.Gpr[0];
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) SystemTable;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) ImageHandle;

  VmContext.Gpr[0] -= 16;
  VmContext.StackRetAddr  = (UINT64) VmContext.Gpr[0];
  //
  // VM pushes 16-bytes for return address. Simulate that here.
  //

  //
  // Begin executing the EBC code
  //
  EbcDebuggerHookExecuteEbcImageEntryPoint (&VmContext);
  EbcExecute (&VmContext);

  //
  // Return the value in Gpr[7] unless there was an error
  //
  ReturnEBCStack(StackIndex);
  return (UINT64) VmContext.Gpr[7];
}
Example #3
0
/**
  Begin executing an EBC image.

  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  EntryPoint            The entrypoint of EBC code.
  @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
EFIAPI
EbcInterpret (
  IN UINTN      EntryPoint,
  IN UINTN      Arg1,
  IN UINTN      Arg2,
  IN UINTN      Arg3,
  IN UINTN      Arg4,
  IN UINTN      Arg5,
  IN UINTN      Arg6,
  IN UINTN      Arg7,
  IN UINTN      Arg8,
  IN UINTN      Arg9,
  IN UINTN      Arg10,
  IN UINTN      Arg11,
  IN UINTN      Arg12,
  IN UINTN      Arg13,
  IN UINTN      Arg14,
  IN UINTN      Arg15,
  IN 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
  //
  Addr = EntryPoint;

  //
  // 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.
  //

  //
  // 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.Gpr[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
  VmContext.HighStackBottom = (UINTN) VmContext.Gpr[0];
  VmContext.Gpr[0] -= sizeof (UINTN);

  //
  // Align the stack on a natural boundary.
  //
  VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof (UINTN) - 1);

  //
  // Put a magic value in the stack gap, then adjust down again.
  //
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;
  VmContext.StackMagicPtr             = (UINTN *) (UINTN) VmContext.Gpr[0];

  //
  // The stack upper to LowStackTop is belong to the VM.
  //
  VmContext.LowStackTop   = (UINTN) VmContext.Gpr[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.Gpr[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.Gpr[7];
}
Example #4
0
/**
  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.
  //
  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.Gpr[0] = (UINT64)(UINTN) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
  VmContext.HighStackBottom = (UINTN)VmContext.Gpr[0];
  VmContext.Gpr[0] &= ~(sizeof (UINTN) - 1);
  VmContext.Gpr[0] -= sizeof (UINTN);

  //
  // Put a magic value in the stack gap, then adjust down again
  //
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;
  VmContext.StackMagicPtr             = (UINTN *) (UINTN) VmContext.Gpr[0];
  VmContext.LowStackTop   = (UINTN) VmContext.Gpr[0];

  //
  // For IA32, this is where we say our return address is
  //
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg16;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg15;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg14;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg13;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg12;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg11;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg10;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg9;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg8;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg7;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg6;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg5;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg4;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg3;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg2;
  VmContext.Gpr[0] -= sizeof (UINTN);
  *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg1;
  VmContext.Gpr[0] -= 16;
  VmContext.StackRetAddr  = (UINT64) VmContext.Gpr[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.Gpr[7];
}