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261 lines
7.5 KiB
C
261 lines
7.5 KiB
C
/** @file
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Main routines for the EBC interpreter. Includes the initialization and
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main interpreter routines.
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Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _EBC_INT_H_
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#define _EBC_INT_H_
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#include <Uefi.h>
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#include <Protocol/DebugSupport.h>
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#include <Protocol/Ebc.h>
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#include <Protocol/EbcVmTest.h>
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#include <Protocol/EbcSimpleDebugger.h>
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#include <Protocol/PeCoffImageEmulator.h>
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#include <Library/BaseLib.h>
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#include <Library/CacheMaintenanceLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PeCoffLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/MemoryAllocationLib.h>
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extern VM_CONTEXT *mVmPtr;
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//
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// Flags passed to the internal create-thunks function.
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//
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#define FLAG_THUNK_ENTRY_POINT 0x01 // thunk for an image entry point
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#define FLAG_THUNK_PROTOCOL 0x00 // thunk for an EBC protocol service
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//
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// Put this value at the bottom of the VM's stack gap so we can check it on
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// occasion to make sure the stack has not been corrupted.
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//
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#define VM_STACK_KEY_VALUE 0xDEADBEEF
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/**
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Create thunks for an EBC image entry point, or an EBC protocol service.
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@param ImageHandle Image handle for the EBC image. If not null, then
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we're creating a thunk for an image entry point.
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@param EbcEntryPoint Address of the EBC code that the thunk is to call
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@param Thunk Returned thunk we create here
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@param Flags Flags indicating options for creating the thunk
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@retval EFI_SUCCESS The thunk was created successfully.
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@retval EFI_INVALID_PARAMETER The parameter of EbcEntryPoint is not 16-bit
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aligned.
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@retval EFI_OUT_OF_RESOURCES There is not enough memory to created the EBC
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Thunk.
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@retval EFI_BUFFER_TOO_SMALL EBC_THUNK_SIZE is not larger enough.
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**/
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EFI_STATUS
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EbcCreateThunks (
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IN EFI_HANDLE ImageHandle,
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IN VOID *EbcEntryPoint,
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OUT VOID **Thunk,
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IN UINT32 Flags
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);
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/**
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Add a thunk to our list of thunks for a given image handle.
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Also flush the instruction cache since we've written thunk code
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to memory that will be executed eventually.
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@param ImageHandle The image handle to which the thunk is tied.
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@param ThunkBuffer The buffer that has been created/allocated.
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@param ThunkSize The size of the thunk memory allocated.
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@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
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@retval EFI_SUCCESS The function completed successfully.
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**/
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EFI_STATUS
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EbcAddImageThunk (
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IN EFI_HANDLE ImageHandle,
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IN VOID *ThunkBuffer,
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IN UINT32 ThunkSize
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);
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//
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// Define a constant of how often to call the debugger periodic callback
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// function.
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//
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#define EFI_TIMER_UNIT_1MS (1000 * 10)
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#define EBC_VM_PERIODIC_CALLBACK_RATE (1000 * EFI_TIMER_UNIT_1MS)
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#define STACK_POOL_SIZE (1024 * 1020)
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#define MAX_STACK_NUM 4
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//
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// External low level functions that are native-processor dependent
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//
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/**
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The VM thunk code stuffs an EBC entry point into a processor
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register. Since we can't use inline assembly to get it from
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the interpreter C code, stuff it into the return value
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register and return.
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@return The contents of the register in which the entry point is passed.
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**/
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UINTN
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EFIAPI
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EbcLLGetEbcEntryPoint (
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VOID
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);
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/**
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This function is called to execute an EBC CALLEX instruction.
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This instruction requires that we thunk out to external native
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code. For x64, we switch stacks, copy the arguments to the stack
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and jump to the specified function.
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On return, we restore the stack pointer to its original location.
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Destroys no working registers.
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@param CallAddr The function address.
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@param EbcSp The new EBC stack pointer.
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@param FramePtr The frame pointer.
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@return The unmodified value returned by the native code.
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**/
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INT64
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EFIAPI
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EbcLLCALLEXNative (
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IN UINTN CallAddr,
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IN UINTN EbcSp,
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IN VOID *FramePtr
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);
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/**
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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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@param VmPtr Pointer to a VM context.
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@param FuncAddr Callee's address
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@param NewStackPointer New stack pointer after the call
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@param FramePtr New frame pointer after the call
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@param Size The size of call instruction
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**/
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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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Returns the stack index and buffer assosicated with the Handle parameter.
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@param Handle The EFI handle as the index to the EBC stack.
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@param StackBuffer A pointer to hold the returned stack buffer.
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@param BufferIndex A pointer to hold the returned stack index.
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@retval EFI_OUT_OF_RESOURCES The Handle parameter does not correspond to any
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existing EBC stack.
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@retval EFI_SUCCESS The stack index and buffer were found and
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returned to the caller.
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**/
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EFI_STATUS
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GetEBCStack(
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IN EFI_HANDLE Handle,
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OUT VOID **StackBuffer,
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OUT UINTN *BufferIndex
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);
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/**
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Returns from the EBC stack by stack Index.
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@param Index Specifies which EBC stack to return from.
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@retval EFI_SUCCESS The function completed successfully.
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**/
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EFI_STATUS
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ReturnEBCStack(
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IN UINTN Index
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);
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/**
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Allocates memory to hold all the EBC stacks.
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@retval EFI_SUCCESS The EBC stacks were allocated successfully.
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@retval EFI_OUT_OF_RESOURCES Not enough memory available for EBC stacks.
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**/
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EFI_STATUS
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InitEBCStack (
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VOID
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);
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/**
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Free all EBC stacks allocated before.
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@retval EFI_SUCCESS All the EBC stacks were freed.
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**/
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EFI_STATUS
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FreeEBCStack(
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VOID
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);
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/**
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Returns from the EBC stack associated with the Handle parameter.
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@param Handle Specifies the EFI handle to find the EBC stack with.
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@retval EFI_SUCCESS The function completed successfully.
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**/
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EFI_STATUS
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ReturnEBCStackByHandle(
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IN EFI_HANDLE Handle
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);
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typedef struct {
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EFI_EBC_PROTOCOL *This;
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VOID *EntryPoint;
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EFI_HANDLE ImageHandle;
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VM_CONTEXT VmContext;
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} EFI_EBC_THUNK_DATA;
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#define EBC_PROTOCOL_PRIVATE_DATA_SIGNATURE SIGNATURE_32 ('e', 'b', 'c', 'p')
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#define EBC_PROTOCOL_PRIVATE_DATA_FROM_THIS(a) \
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CR(a, EBC_PROTOCOL_PRIVATE_DATA, EbcProtocol, EBC_PROTOCOL_PRIVATE_DATA_SIGNATURE)
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/**
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Allocates a buffer of type EfiBootServicesCode.
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@param AllocationSize The number of bytes to allocate.
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@return A pointer to the allocated buffer or NULL if allocation fails.
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**/
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VOID *
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EFIAPI
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EbcAllocatePoolForThunk (
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IN UINTN AllocationSize
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);
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#endif // #ifndef _EBC_INT_H_
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