/** @file
Main routines for the EBC interpreter. Includes the initialization and
main interpreter routines.
Copyright (c) 2006 - 2010, 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.
**/
#ifndef _EBC_INT_H_
#define _EBC_INT_H_
#include
#include
#include
#include
#include
#include
#include
#include
#include
typedef INT64 VM_REGISTER;
typedef UINT8 *VMIP; // instruction pointer for the VM
typedef UINT32 EXCEPTION_FLAGS;
typedef struct {
VM_REGISTER Gpr[8]; // General purpose registers.
UINT64 Flags; // Flags register:
// 0 Set to 1 if the result of the last compare was true
// 1 Set to 1 if stepping
// 2..63 Reserved.
VMIP Ip; // Instruction pointer.
UINTN LastException; //
EXCEPTION_FLAGS ExceptionFlags; // to keep track of exceptions
UINT32 StopFlags;
UINT32 CompilerVersion; // via break(6)
UINTN HighStackBottom; // bottom of the upper stack
UINTN LowStackTop; // top of the lower stack
UINT64 StackRetAddr; // location of final return address on stack
UINTN *StackMagicPtr; // pointer to magic value on stack to detect corruption
EFI_HANDLE ImageHandle; // for this EBC driver
EFI_SYSTEM_TABLE *SystemTable; // for debugging only
UINTN LastAddrConverted; // for debug
UINTN LastAddrConvertedValue; // for debug
VOID *FramePtr;
VOID *EntryPoint; // entry point of EBC image
UINTN ImageBase;
VOID *StackPool;
VOID *StackTop;
} VM_CONTEXT;
extern VM_CONTEXT *mVmPtr;
//
// Bits of exception flags field of VM context
//
#define EXCEPTION_FLAG_FATAL 0x80000000 // can't continue
#define EXCEPTION_FLAG_ERROR 0x40000000 // bad, but try to continue
#define EXCEPTION_FLAG_WARNING 0x20000000 // harmless problem
#define EXCEPTION_FLAG_NONE 0x00000000 // for normal return
//
// Flags passed to the internal create-thunks function.
//
#define FLAG_THUNK_ENTRY_POINT 0x01 // thunk for an image entry point
#define FLAG_THUNK_PROTOCOL 0x00 // thunk for an EBC protocol service
//
// Put this value at the bottom of the VM's stack gap so we can check it on
// occasion to make sure the stack has not been corrupted.
//
#define VM_STACK_KEY_VALUE 0xDEADBEEF
/**
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
);
/**
Add a thunk to our list of thunks for a given image handle.
Also flush the instruction cache since we've written thunk code
to memory that will be executed eventually.
@param ImageHandle The image handle to which the thunk is tied.
@param ThunkBuffer The buffer that has been created/allocated.
@param ThunkSize The size of the thunk memory allocated.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EbcAddImageThunk (
IN EFI_HANDLE ImageHandle,
IN VOID *ThunkBuffer,
IN UINT32 ThunkSize
);
//
// The interpreter calls these when an exception is detected,
// or as a periodic callback.
//
/**
The VM interpreter calls this function when an exception is detected.
@param ExceptionType Specifies the processor exception detected.
@param ExceptionFlags Specifies the exception context.
@param VmPtr Pointer to a VM context for passing info to the
EFI debugger.
@retval EFI_SUCCESS This function completed successfully.
**/
EFI_STATUS
EbcDebugSignalException (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN EXCEPTION_FLAGS ExceptionFlags,
IN VM_CONTEXT *VmPtr
);
//
// Define a constant of how often to call the debugger periodic callback
// function.
//
#define EFI_TIMER_UNIT_1MS (1000 * 10)
#define EBC_VM_PERIODIC_CALLBACK_RATE (1000 * EFI_TIMER_UNIT_1MS)
#define STACK_POOL_SIZE (1024 * 1020)
#define MAX_STACK_NUM 4
//
// External low level functions that are native-processor dependent
//
/**
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.
@return The contents of the register in which the entry point is passed.
**/
UINTN
EFIAPI
EbcLLGetEbcEntryPoint (
VOID
);
/**
Returns the caller's value of the stack pointer.
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.
@return The current value of the stack pointer for the caller.
**/
UINTN
EFIAPI
EbcLLGetStackPointer (
VOID
);
/**
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.
@param CallAddr The function address.
@param EbcSp The new EBC stack pointer.
@param FramePtr The frame pointer.
**/
VOID
EFIAPI
EbcLLCALLEXNative (
IN UINTN CallAddr,
IN UINTN EbcSp,
IN VOID *FramePtr
);
/**
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
);
/**
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.
@return The unmodified value returned by the native code.
**/
INT64
EFIAPI
EbcLLGetReturnValue (
VOID
);
/**
Returns the stack index and buffer assosicated with the Handle parameter.
@param Handle The EFI handle as the index to the EBC stack.
@param StackBuffer A pointer to hold the returned stack buffer.
@param BufferIndex A pointer to hold the returned stack index.
@retval EFI_OUT_OF_RESOURCES The Handle parameter does not correspond to any
existing EBC stack.
@retval EFI_SUCCESS The stack index and buffer were found and
returned to the caller.
**/
EFI_STATUS
GetEBCStack(
IN EFI_HANDLE Handle,
OUT VOID **StackBuffer,
OUT UINTN *BufferIndex
);
/**
Returns from the EBC stack by stack Index.
@param Index Specifies which EBC stack to return from.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
ReturnEBCStack(
IN UINTN Index
);
/**
Allocates memory to hold all the EBC stacks.
@retval EFI_SUCCESS The EBC stacks were allocated successfully.
@retval EFI_OUT_OF_RESOURCES Not enough memory available for EBC stacks.
**/
EFI_STATUS
InitEBCStack (
VOID
);
/**
Free all EBC stacks allocated before.
@retval EFI_SUCCESS All the EBC stacks were freed.
**/
EFI_STATUS
FreeEBCStack(
VOID
);
/**
Returns from the EBC stack associated with the Handle parameter.
@param Handle Specifies the EFI handle to find the EBC stack with.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
ReturnEBCStackByHandle(
IN EFI_HANDLE Handle
);
//
// Defines for a simple EBC debugger interface
//
typedef struct _EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL;
#define EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL_GUID \
{ \
0x2a72d11e, 0x7376, 0x40f6, { 0x9c, 0x68, 0x23, 0xfa, 0x2f, 0xe3, 0x63, 0xf1 } \
}
typedef
EFI_STATUS
(*EBC_DEBUGGER_SIGNAL_EXCEPTION) (
IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,
IN VM_CONTEXT *VmPtr,
IN EFI_EXCEPTION_TYPE ExceptionType
);
typedef
VOID
(*EBC_DEBUGGER_DEBUG) (
IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,
IN VM_CONTEXT *VmPtr
);
typedef
UINT32
(*EBC_DEBUGGER_DASM) (
IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,
IN VM_CONTEXT *VmPtr,
IN UINT16 *DasmString OPTIONAL,
IN UINT32 DasmStringSize
);
//
// This interface allows you to configure the EBC debug support
// driver. For example, turn on or off saving and printing of
// delta VM even if called. Or to even disable the entire interface,
// in which case all functions become no-ops.
//
typedef
EFI_STATUS
(*EBC_DEBUGGER_CONFIGURE) (
IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,
IN UINT32 ConfigId,
IN UINTN ConfigValue
);
//
// Prototype for the actual EBC debug support protocol interface
//
struct _EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL {
EBC_DEBUGGER_DEBUG Debugger;
EBC_DEBUGGER_SIGNAL_EXCEPTION SignalException;
EBC_DEBUGGER_DASM Dasm;
EBC_DEBUGGER_CONFIGURE Configure;
};
typedef struct {
EFI_EBC_PROTOCOL *This;
VOID *EntryPoint;
EFI_HANDLE ImageHandle;
VM_CONTEXT VmContext;
} EFI_EBC_THUNK_DATA;
#define EBC_PROTOCOL_PRIVATE_DATA_SIGNATURE SIGNATURE_32 ('e', 'b', 'c', 'p')
#define EBC_PROTOCOL_PRIVATE_DATA_FROM_THIS(a) \
CR(a, EBC_PROTOCOL_PRIVATE_DATA, EbcProtocol, EBC_PROTOCOL_PRIVATE_DATA_SIGNATURE)
#endif // #ifndef _EBC_INT_H_