2019-09-03 11:58:42 +02:00
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/** @file
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This module contains EBC support routines that are customized based on
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the target x64 processor.
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Copyright (c) 2006 - 2018, 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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#include "EbcInt.h"
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#include "EbcExecute.h"
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#include "EbcDebuggerHook.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 * 8)
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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 0xAFAFAFAFAFAFAFAFull
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#define EBC_LL_EBC_ENTRYPOINT_SIGNATURE 0xFAFAFAFAFAFAFAFAull
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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 rax, 0xca112ebcca112ebc => 48 B8 BC 2E 11 CA BC 2E 11 CA
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//
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0x48, 0xB8, 0xBC, 0x2E, 0x11, 0xCA, 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 r10, EbcEntryPoint => 49 BA XX XX XX XX XX XX XX XX (To be fixed at runtime)
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// These 8 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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0x49, 0xBA,
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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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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 32) & 0xFF),
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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 40) & 0xFF),
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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 48) & 0xFF),
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(UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 56) & 0xFF),
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//
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// Stick in a load of r11 with the address of appropriate VM function.
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// mov r11, EbcLLEbcInterpret => 49 BB XX XX XX XX XX XX XX XX (To be fixed at runtime)
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//
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0x49, 0xBB,
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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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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 32) & 0xFF),
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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 40) & 0xFF),
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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 48) & 0xFF),
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(UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 56) & 0xFF),
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//
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// Stick in jump opcode bytes
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// jmp r11 => 41 FF E3
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//
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0x41, 0xFF, 0xE3,
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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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Pushes a 64 bit unsigned value to the VM stack.
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@param VmPtr The pointer to current VM context.
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@param Arg The value to be pushed.
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**/
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VOID
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PushU64 (
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IN VM_CONTEXT *VmPtr,
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IN UINT64 Arg
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)
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{
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//
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// Advance the VM stack down, and then copy the argument to the stack.
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// Hope it's aligned.
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//
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VmPtr->Gpr[0] -= sizeof (UINT64);
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*(UINT64 *) VmPtr->Gpr[0] = Arg;
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return;
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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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// Adjust the VM's stack pointer down.
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//
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Status = GetEBCStack((EFI_HANDLE)(UINTN)-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) ((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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// Align the stack on a natural boundary.
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//
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VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof (UINTN) - 1);
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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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// The stack upper to LowStackTop is belong to the VM.
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//
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VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];
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//
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// For the worst case, assume there are 4 arguments passed in registers, store
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// them to VM's stack.
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//
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PushU64 (&VmContext, (UINT64) Arg16);
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PushU64 (&VmContext, (UINT64) Arg15);
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PushU64 (&VmContext, (UINT64) Arg14);
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PushU64 (&VmContext, (UINT64) Arg13);
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PushU64 (&VmContext, (UINT64) Arg12);
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PushU64 (&VmContext, (UINT64) Arg11);
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PushU64 (&VmContext, (UINT64) Arg10);
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PushU64 (&VmContext, (UINT64) Arg9);
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PushU64 (&VmContext, (UINT64) Arg8);
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PushU64 (&VmContext, (UINT64) Arg7);
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PushU64 (&VmContext, (UINT64) Arg6);
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PushU64 (&VmContext, (UINT64) Arg5);
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PushU64 (&VmContext, (UINT64) Arg4);
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PushU64 (&VmContext, (UINT64) Arg3);
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PushU64 (&VmContext, (UINT64) Arg2);
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PushU64 (&VmContext, (UINT64) Arg1);
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//
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// Interpreter assumes 64-bit return address is pushed on the stack.
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// The x64 does not do this so pad the stack accordingly.
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//
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PushU64 (&VmContext, (UINT64) 0);
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PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);
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//
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// For x64, this is where we say our return address is
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//
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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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EbcDebuggerHookEbcInterpret (&VmContext);
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EbcExecute (&VmContext);
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//
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// Return the value in Gpr[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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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) ((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] &= ~(VM_REGISTER)(sizeof(UINTN) - 1);
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//
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VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];
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//
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// Simply copy the image handle and system table onto the EBC stack.
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// Greatly simplifies things by not having to spill the args.
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//
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PushU64 (&VmContext, (UINT64) SystemTable);
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PushU64 (&VmContext, (UINT64) ImageHandle);
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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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|
|
|
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
|
|
|
|
//
|
|
|
|
EbcDebuggerHookExecuteEbcImageEntryPoint (&VmContext);
|
|
|
|
EbcExecute (&VmContext);
|
|
|
|
|
|
|
|
//
|
|
|
|
// Return the value in Gpr[7] unless there was an error
|
|
|
|
//
|
|
|
|
ReturnEBCStack(StackIndex);
|
|
|
|
return (UINT64) VmContext.Gpr[7];
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
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
|
|
|
|
)
|
|
|
|
{
|
|
|
|
UINT8 *Ptr;
|
|
|
|
UINT8 *ThunkBase;
|
|
|
|
UINT32 Index;
|
|
|
|
INT32 ThunkSize;
|
|
|
|
|
|
|
|
//
|
|
|
|
// Check alignment of pointer to EBC code
|
|
|
|
//
|
|
|
|
if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {
|
|
|
|
return EFI_INVALID_PARAMETER;
|
|
|
|
}
|
|
|
|
|
|
|
|
ThunkSize = sizeof(mInstructionBufferTemplate);
|
|
|
|
|
|
|
|
Ptr = EbcAllocatePoolForThunk (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
|
|
|
|
//
|
2020-05-01 18:26:28 +02:00
|
|
|
CopyMem(Ptr, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate));
|
2019-09-03 11:58:42 +02:00
|
|
|
|
|
|
|
//
|
|
|
|
// 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
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
|
|
|
|
)
|
|
|
|
{
|
|
|
|
UINTN IsThunk;
|
|
|
|
UINTN TargetEbcAddr;
|
|
|
|
UINT8 InstructionBuffer[sizeof(mInstructionBufferTemplate)];
|
|
|
|
UINTN Index;
|
|
|
|
UINTN IndexOfEbcEntrypoint;
|
|
|
|
|
|
|
|
IsThunk = 1;
|
|
|
|
TargetEbcAddr = 0;
|
|
|
|
IndexOfEbcEntrypoint = 0;
|
|
|
|
|
|
|
|
//
|
|
|
|
// Processor specific code to check whether the callee is a thunk to EBC.
|
|
|
|
//
|
2020-05-01 18:26:28 +02:00
|
|
|
CopyMem(InstructionBuffer, (VOID *)FuncAddr, sizeof(InstructionBuffer));
|
2019-09-03 11:58:42 +02:00
|
|
|
//
|
|
|
|
// Fill the signature according to mInstructionBufferTemplate
|
|
|
|
//
|
|
|
|
for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {
|
|
|
|
if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_ENTRYPOINT_SIGNATURE) {
|
|
|
|
*(UINTN *)&InstructionBuffer[Index] = EBC_ENTRYPOINT_SIGNATURE;
|
|
|
|
IndexOfEbcEntrypoint = Index;
|
|
|
|
}
|
|
|
|
if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {
|
|
|
|
*(UINTN *)&InstructionBuffer[Index] = EBC_LL_EBC_ENTRYPOINT_SIGNATURE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
//
|
|
|
|
// Check if we need thunk to native
|
|
|
|
//
|
|
|
|
if (CompareMem (InstructionBuffer, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate)) != 0) {
|
|
|
|
IsThunk = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
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->Gpr[0] -= 8;
|
|
|
|
VmWriteMemN (VmPtr, (UINTN) VmPtr->Gpr[0], (UINTN) FramePtr);
|
|
|
|
VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->Gpr[0];
|
|
|
|
VmPtr->Gpr[0] -= 8;
|
|
|
|
VmWriteMem64 (VmPtr, (UINTN) VmPtr->Gpr[0], (UINT64) (UINTN) (VmPtr->Ip + Size));
|
|
|
|
|
2020-05-01 18:26:28 +02:00
|
|
|
CopyMem(&TargetEbcAddr, (UINT8 *)FuncAddr + IndexOfEbcEntrypoint, sizeof(UINTN));
|
2019-09-03 11:58:42 +02:00
|
|
|
VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;
|
|
|
|
} else {
|
|
|
|
//
|
|
|
|
// The callee is not a thunk to EBC, call native code,
|
|
|
|
// and get return value.
|
|
|
|
//
|
|
|
|
VmPtr->Gpr[7] = EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);
|
|
|
|
|
|
|
|
//
|
|
|
|
// Advance the IP.
|
|
|
|
//
|
|
|
|
VmPtr->Ip += Size;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|