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6e1e540554
2) replace StrCpy() usage in Variable driver with StrnCpy(). Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Feng Tian <feng.tian@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15770 6f19259b-4bc3-4df7-8a09-765794883524
530 lines
16 KiB
C
530 lines
16 KiB
C
/** @file
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This module contains EBC support routines that are customized based on
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the target ia32 processor.
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Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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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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**/
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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 STACK_REMAIN_SIZE (1024 * 4)
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//
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// This is instruction buffer used to create EBC thunk
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//
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#define EBC_ENTRYPOINT_SIGNATURE 0xAFAFAFAF
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#define EBC_LL_EBC_ENTRYPOINT_SIGNATURE 0xFAFAFAFA
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UINT8 mInstructionBufferTemplate[] = {
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//
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// Add a magic code here to help the VM recognize the thunk..
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// mov eax, 0xca112ebc => B8 BC 2E 11 CA
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//
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0xB8, 0xBC, 0x2E, 0x11, 0xCA,
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//
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// Add code bytes to load up a processor register with the EBC entry point.
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// mov eax, EbcEntryPoint => B8 XX XX XX XX (To be fixed at runtime)
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// These 4 bytes of the thunk entry is the address of the EBC
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// entry point.
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//
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0xB8,
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(UINT8)(EBC_ENTRYPOINT_SIGNATURE & 0xFF),
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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 8) & 0xFF),
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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 16) & 0xFF),
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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 24) & 0xFF),
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//
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// Stick in a load of ecx with the address of appropriate VM function.
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// mov ecx, EbcLLEbcInterpret => B9 XX XX XX XX (To be fixed at runtime)
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//
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0xB9,
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(UINT8)(EBC_LL_EBC_ENTRYPOINT_SIGNATURE & 0xFF),
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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 8) & 0xFF),
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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 16) & 0xFF),
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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 24) & 0xFF),
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//
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// Stick in jump opcode bytes
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// jmp ecx => FF E1
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//
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0xFF, 0xE1,
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};
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/**
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Begin executing an EBC image.
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This is used for Ebc Thunk call.
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@return The value returned by the EBC application we're going to run.
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**/
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UINT64
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EFIAPI
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EbcLLEbcInterpret (
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VOID
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);
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/**
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Begin executing an EBC image.
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This is used for Ebc image entrypoint.
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@return The value returned by the EBC application we're going to run.
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**/
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UINT64
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EFIAPI
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EbcLLExecuteEbcImageEntryPoint (
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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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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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UINTN IsThunk;
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UINTN TargetEbcAddr;
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UINT8 InstructionBuffer[sizeof(mInstructionBufferTemplate)];
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UINTN Index;
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UINTN IndexOfEbcEntrypoint;
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IsThunk = 1;
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TargetEbcAddr = 0;
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IndexOfEbcEntrypoint = 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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CopyMem (InstructionBuffer, (VOID *)FuncAddr, sizeof(InstructionBuffer));
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//
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// Fill the signature according to mInstructionBufferTemplate
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//
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for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {
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if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_ENTRYPOINT_SIGNATURE) {
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*(UINTN *)&InstructionBuffer[Index] = EBC_ENTRYPOINT_SIGNATURE;
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IndexOfEbcEntrypoint = Index;
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}
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if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {
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*(UINTN *)&InstructionBuffer[Index] = EBC_LL_EBC_ENTRYPOINT_SIGNATURE;
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}
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}
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//
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// Check if we need thunk to native
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//
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if (CompareMem (InstructionBuffer, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate)) != 0) {
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IsThunk = 0;
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}
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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->Gpr[0] -= 8;
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VmWriteMemN (VmPtr, (UINTN) VmPtr->Gpr[0], (UINTN) FramePtr);
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VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->Gpr[0];
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VmPtr->Gpr[0] -= 8;
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VmWriteMem64 (VmPtr, (UINTN) VmPtr->Gpr[0], (UINT64) (UINTN) (VmPtr->Ip + Size));
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CopyMem (&TargetEbcAddr, (UINT8 *)FuncAddr + IndexOfEbcEntrypoint, sizeof(UINTN));
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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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// and get return value.
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//
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VmPtr->Gpr[7] = EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);
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//
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// Advance the IP.
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//
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VmPtr->Ip += Size;
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}
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}
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/**
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Begin executing an EBC image.
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This is a thunk function. Microsoft x64 compiler only provide fast_call
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calling convention, so the first four arguments are passed by rcx, rdx,
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r8, and r9, while other arguments are passed in stack.
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@param EntryPoint The entrypoint of EBC code.
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@param Arg1 The 1st argument.
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@param Arg2 The 2nd argument.
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@param Arg3 The 3rd argument.
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@param Arg4 The 4th argument.
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@param Arg5 The 5th argument.
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@param Arg6 The 6th argument.
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@param Arg7 The 7th argument.
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@param Arg8 The 8th argument.
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@param Arg9 The 9th argument.
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@param Arg10 The 10th argument.
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@param Arg11 The 11th argument.
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@param Arg12 The 12th argument.
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@param Arg13 The 13th argument.
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@param Arg14 The 14th argument.
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@param Arg15 The 15th argument.
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@param Arg16 The 16th argument.
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@return The value returned by the EBC application we're going to run.
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**/
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UINT64
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EFIAPI
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EbcInterpret (
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IN UINTN EntryPoint,
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IN UINTN Arg1,
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IN UINTN Arg2,
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IN UINTN Arg3,
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IN UINTN Arg4,
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IN UINTN Arg5,
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IN UINTN Arg6,
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IN UINTN Arg7,
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IN UINTN Arg8,
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IN UINTN Arg9,
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IN UINTN Arg10,
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IN UINTN Arg11,
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IN UINTN Arg12,
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IN UINTN Arg13,
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IN UINTN Arg14,
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IN UINTN Arg15,
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IN UINTN Arg16
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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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//
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VM_CONTEXT VmContext;
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UINTN Addr;
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EFI_STATUS Status;
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UINTN StackIndex;
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//
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// Get the EBC entry point
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//
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Addr = EntryPoint;
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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;
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//
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// Initialize the stack pointer for the EBC. Get the current system stack
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// pointer and adjust it down by the max needed for the interpreter.
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//
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//
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// Align the stack on a natural boundary
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//
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//
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// Allocate stack pool
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//
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Status = GetEBCStack((EFI_HANDLE)-1, &VmContext.StackPool, &StackIndex);
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if (EFI_ERROR(Status)) {
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return Status;
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}
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VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
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VmContext.Gpr[0] = (UINT64)(UINTN) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
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VmContext.HighStackBottom = (UINTN)VmContext.Gpr[0];
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VmContext.Gpr[0] &= ~((VM_REGISTER)(sizeof (UINTN) - 1));
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VmContext.Gpr[0] -= sizeof (UINTN);
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//
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// Put a magic value in the stack gap, then adjust down again
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//
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;
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VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.Gpr[0];
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VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];
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//
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// For IA32, this is where we say our return address is
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//
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg16;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg15;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg14;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg13;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg12;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg11;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg10;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg9;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg8;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg7;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg6;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg5;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg4;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg3;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg2;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) Arg1;
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VmContext.Gpr[0] -= 16;
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VmContext.StackRetAddr = (UINT64) VmContext.Gpr[0];
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//
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// We need to keep track of where the EBC stack starts. This way, if the EBC
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// accesses any stack variables above its initial stack setting, then we know
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// it's accessing variables passed into it, which means the data is on the
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// VM's stack.
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// When we're called, on the stack (high to low) we have the parameters, the
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// return address, then the saved ebp. Save the pointer to the return address.
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// EBC code knows that's there, so should look above it for function parameters.
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// The offset is the size of locals (VMContext + Addr + saved ebp).
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// Note that the interpreter assumes there is a 16 bytes of return address on
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// the stack too, so adjust accordingly.
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// VmContext.HighStackBottom = (UINTN)(Addr + sizeof (VmContext) + sizeof (Addr));
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//
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//
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// Begin executing the EBC code
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//
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EbcExecute (&VmContext);
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//
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// Return the value in R[7] unless there was an error
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//
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ReturnEBCStack(StackIndex);
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return (UINT64) VmContext.Gpr[7];
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}
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/**
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Begin executing an EBC image.
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@param EntryPoint The entrypoint of EBC code.
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@param ImageHandle image handle for the EBC application we're executing
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@param SystemTable standard system table passed into an driver's entry
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point
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@return The value returned by the EBC application we're going to run.
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**/
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UINT64
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EFIAPI
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ExecuteEbcImageEntryPoint (
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IN UINTN EntryPoint,
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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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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//
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VM_CONTEXT VmContext;
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UINTN Addr;
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EFI_STATUS Status;
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UINTN StackIndex;
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//
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// Get the EBC entry point
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//
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Addr = EntryPoint;
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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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// Save the image handle so we can track the thunks created for this image
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//
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VmContext.ImageHandle = ImageHandle;
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VmContext.SystemTable = SystemTable;
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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;
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//
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// Initialize the stack pointer for the EBC. Get the current system stack
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// pointer and adjust it down by the max needed for the interpreter.
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//
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//
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// Allocate stack pool
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//
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Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);
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if (EFI_ERROR(Status)) {
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return Status;
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}
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VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
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VmContext.Gpr[0] = (UINT64)(UINTN) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
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VmContext.HighStackBottom = (UINTN)VmContext.Gpr[0];
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VmContext.Gpr[0] -= sizeof (UINTN);
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//
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// Put a magic value in the stack gap, then adjust down again
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//
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;
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VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.Gpr[0];
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//
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// Align the stack on a natural boundary
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// VmContext.Gpr[0] &= ~(sizeof(UINTN) - 1);
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//
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VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) SystemTable;
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VmContext.Gpr[0] -= sizeof (UINTN);
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*(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) ImageHandle;
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VmContext.Gpr[0] -= 16;
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VmContext.StackRetAddr = (UINT64) VmContext.Gpr[0];
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//
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// VM pushes 16-bytes for return address. Simulate that here.
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//
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//
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// Begin executing the EBC code
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//
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EbcExecute (&VmContext);
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//
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// Return the value in R[7] unless there was an error
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//
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ReturnEBCStack(StackIndex);
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return (UINT64) VmContext.Gpr[7];
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}
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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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UINT8 *Ptr;
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UINT8 *ThunkBase;
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UINT32 Index;
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INT32 ThunkSize;
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//
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// Check alignment of pointer to EBC code
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//
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if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {
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return EFI_INVALID_PARAMETER;
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}
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|
|
ThunkSize = sizeof(mInstructionBufferTemplate);
|
|
|
|
Ptr = AllocatePool (sizeof(mInstructionBufferTemplate));
|
|
|
|
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;
|
|
|
|
//
|
|
// Copy whole thunk instruction buffer template
|
|
//
|
|
CopyMem (Ptr, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate));
|
|
|
|
//
|
|
// Patch EbcEntryPoint and EbcLLEbcInterpret
|
|
//
|
|
for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {
|
|
if (*(UINTN *)&Ptr[Index] == EBC_ENTRYPOINT_SIGNATURE) {
|
|
*(UINTN *)&Ptr[Index] = (UINTN)EbcEntryPoint;
|
|
}
|
|
if (*(UINTN *)&Ptr[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {
|
|
if ((Flags & FLAG_THUNK_ENTRY_POINT) != 0) {
|
|
*(UINTN *)&Ptr[Index] = (UINTN)EbcLLExecuteEbcImageEntryPoint;
|
|
} else {
|
|
*(UINTN *)&Ptr[Index] = (UINTN)EbcLLEbcInterpret;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// 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;
|
|
}
|