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disasm.cpp
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//////////////////////////////////////////////////////////////////////////////
//
// Detours Disassembler (disasm.cpp of detours.lib)
//
// Microsoft Research Detours Package, Version 4.0.1
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// #define DETOUR_DEBUG 1
#define DETOURS_INTERNAL
#include "detours.h"
#include <limits.h>
#if DETOURS_VERSION != 0x4c0c1 // 0xMAJORcMINORcPATCH
#error detours.h version mismatch
#endif
#undef ASSERT
#define ASSERT(x)
//////////////////////////////////////////////////////////////////////////////
//
// Special macros to handle the case when we are building disassembler for
// offline processing.
//
#if defined(DETOURS_X86_OFFLINE_LIBRARY) \
|| defined(DETOURS_X64_OFFLINE_LIBRARY) \
|| defined(DETOURS_ARM_OFFLINE_LIBRARY) \
|| defined(DETOURS_ARM64_OFFLINE_LIBRARY) \
|| defined(DETOURS_IA64_OFFLINE_LIBRARY)
#undef DETOURS_X64
#undef DETOURS_X86
#undef DETOURS_IA64
#undef DETOURS_ARM
#undef DETOURS_ARM64
#if defined(DETOURS_X86_OFFLINE_LIBRARY)
#define DetourCopyInstruction DetourCopyInstructionX86
#define DetourSetCodeModule DetourSetCodeModuleX86
#define CDetourDis CDetourDisX86
#define DETOURS_X86
#elif defined(DETOURS_X64_OFFLINE_LIBRARY)
#if !defined(DETOURS_64BIT)
// Fix this as/if bugs are discovered.
//#error X64 disassembler can only build for 64-bit.
#endif
#define DetourCopyInstruction DetourCopyInstructionX64
#define DetourSetCodeModule DetourSetCodeModuleX64
#define CDetourDis CDetourDisX64
#define DETOURS_X64
#elif defined(DETOURS_ARM_OFFLINE_LIBRARY)
#define DetourCopyInstruction DetourCopyInstructionARM
#define DetourSetCodeModule DetourSetCodeModuleARM
#define CDetourDis CDetourDisARM
#define DETOURS_ARM
#elif defined(DETOURS_ARM64_OFFLINE_LIBRARY)
#define DetourCopyInstruction DetourCopyInstructionARM64
#define DetourSetCodeModule DetourSetCodeModuleARM64
#define CDetourDis CDetourDisARM64
#define DETOURS_ARM64
#elif defined(DETOURS_IA64_OFFLINE_LIBRARY)
#define DetourCopyInstruction DetourCopyInstructionIA64
#define DetourSetCodeModule DetourSetCodeModuleIA64
#define DETOURS_IA64
#else
#error
#endif
#endif
//////////////////////////////////////////////////////////////////////////////
//
// Function:
// DetourCopyInstruction(PVOID pDst,
// PVOID *ppDstPool
// PVOID pSrc,
// PVOID *ppTarget,
// LONG *plExtra)
// Purpose:
// Copy a single instruction from pSrc to pDst.
//
// Arguments:
// pDst:
// Destination address for the instruction. May be NULL in which
// case DetourCopyInstruction is used to measure an instruction.
// If not NULL then the source instruction is copied to the
// destination instruction and any relative arguments are adjusted.
// ppDstPool:
// Destination address for the end of the constant pool. The
// constant pool works backwards toward pDst. All memory between
// pDst and *ppDstPool must be available for use by this function.
// ppDstPool may be NULL if pDst is NULL.
// pSrc:
// Source address of the instruction.
// ppTarget:
// Out parameter for any target instruction address pointed to by
// the instruction. For example, a branch or a jump insruction has
// a target, but a load or store instruction doesn't. A target is
// another instruction that may be executed as a result of this
// instruction. ppTarget may be NULL.
// plExtra:
// Out parameter for the number of extra bytes needed by the
// instruction to reach the target. For example, lExtra = 3 if the
// instruction had an 8-bit relative offset, but needs a 32-bit
// relative offset.
//
// Returns:
// Returns the address of the next instruction (following in the source)
// instruction. By subtracting pSrc from the return value, the caller
// can determinte the size of the instruction copied.
//
// Comments:
// By following the pTarget, the caller can follow alternate
// instruction streams. However, it is not always possible to determine
// the target based on static analysis. For example, the destination of
// a jump relative to a register cannot be determined from just the
// instruction stream. The output value, pTarget, can have any of the
// following outputs:
// DETOUR_INSTRUCTION_TARGET_NONE:
// The instruction has no targets.
// DETOUR_INSTRUCTION_TARGET_DYNAMIC:
// The instruction has a non-deterministic (dynamic) target.
// (i.e. the jump is to an address held in a register.)
// Address: The instruction has the specified target.
//
// When copying instructions, DetourCopyInstruction insures that any
// targets remain constant. It does so by adjusting any IP relative
// offsets.
//
#pragma data_seg(".detourd")
#pragma const_seg(".detourc")
//////////////////////////////////////////////////// X86 and X64 Disassembler.
//
// Includes full support for all x86 chips prior to the Pentium III, and some newer stuff.
//
#if defined(DETOURS_X64) || defined(DETOURS_X86)
class CDetourDis
{
public:
CDetourDis(_Out_opt_ PBYTE *ppbTarget,
_Out_opt_ LONG *plExtra);
PBYTE CopyInstruction(PBYTE pbDst, PBYTE pbSrc);
static BOOL SanityCheckSystem();
static BOOL SetCodeModule(PBYTE pbBeg, PBYTE pbEnd, BOOL fLimitReferencesToModule);
public:
struct COPYENTRY;
typedef const COPYENTRY * REFCOPYENTRY;
typedef PBYTE (CDetourDis::* COPYFUNC)(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
// nFlagBits flags.
enum {
DYNAMIC = 0x1u,
ADDRESS = 0x2u,
NOENLARGE = 0x4u,
RAX = 0x8u,
};
// ModR/M Flags
enum {
SIB = 0x10u,
RIP = 0x20u,
NOTSIB = 0x0fu,
};
struct COPYENTRY
{
// Many of these fields are often ignored. See ENTRY_DataIgnored.
ULONG nFixedSize : 4; // Fixed size of opcode
ULONG nFixedSize16 : 4; // Fixed size when 16 bit operand
ULONG nModOffset : 4; // Offset to mod/rm byte (0=none)
ULONG nRelOffset : 4; // Offset to relative target.
ULONG nFlagBits : 4; // Flags for DYNAMIC, etc.
COPYFUNC pfCopy; // Function pointer.
};
protected:
// These macros define common uses of nFixedSize, nFixedSize16, nModOffset, nRelOffset, nFlagBits, pfCopy.
#define ENTRY_DataIgnored 0, 0, 0, 0, 0,
#define ENTRY_CopyBytes1 { 1, 1, 0, 0, 0, &CDetourDis::CopyBytes }
#ifdef DETOURS_X64
#define ENTRY_CopyBytes1Address { 9, 5, 0, 0, ADDRESS, &CDetourDis::CopyBytes }
#else
#define ENTRY_CopyBytes1Address { 5, 3, 0, 0, ADDRESS, &CDetourDis::CopyBytes }
#endif
#define ENTRY_CopyBytes1Dynamic { 1, 1, 0, 0, DYNAMIC, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2 { 2, 2, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2Jump { ENTRY_DataIgnored &CDetourDis::CopyBytesJump }
#define ENTRY_CopyBytes2CantJump { 2, 2, 0, 1, NOENLARGE, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2Dynamic { 2, 2, 0, 0, DYNAMIC, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3 { 3, 3, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3Dynamic { 3, 3, 0, 0, DYNAMIC, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3Or5 { 5, 3, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3Or5Dynamic { 5, 3, 0, 0, DYNAMIC, &CDetourDis::CopyBytes }// x86 only
#ifdef DETOURS_X64
#define ENTRY_CopyBytes3Or5Rax { 5, 3, 0, 0, RAX, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3Or5Target { 5, 5, 0, 1, 0, &CDetourDis::CopyBytes }
#else
#define ENTRY_CopyBytes3Or5Rax { 5, 3, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3Or5Target { 5, 3, 0, 1, 0, &CDetourDis::CopyBytes }
#endif
#define ENTRY_CopyBytes4 { 4, 4, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes5 { 5, 5, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes5Or7Dynamic { 7, 5, 0, 0, DYNAMIC, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes7 { 7, 7, 0, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2Mod { 2, 2, 1, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2ModDynamic { 2, 2, 1, 0, DYNAMIC, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2Mod1 { 3, 3, 1, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes2ModOperand { 6, 4, 1, 0, 0, &CDetourDis::CopyBytes }
#define ENTRY_CopyBytes3Mod { 3, 3, 2, 0, 0, &CDetourDis::CopyBytes } // SSE3 0F 38 opcode modrm
#define ENTRY_CopyBytes3Mod1 { 4, 4, 2, 0, 0, &CDetourDis::CopyBytes } // SSE3 0F 3A opcode modrm .. imm8
#define ENTRY_CopyBytesPrefix { ENTRY_DataIgnored &CDetourDis::CopyBytesPrefix }
#define ENTRY_CopyBytesSegment { ENTRY_DataIgnored &CDetourDis::CopyBytesSegment }
#define ENTRY_CopyBytesRax { ENTRY_DataIgnored &CDetourDis::CopyBytesRax }
#define ENTRY_CopyF2 { ENTRY_DataIgnored &CDetourDis::CopyF2 }
#define ENTRY_CopyF3 { ENTRY_DataIgnored &CDetourDis::CopyF3 } // 32bit x86 only
#define ENTRY_Copy0F { ENTRY_DataIgnored &CDetourDis::Copy0F }
#define ENTRY_Copy0F78 { ENTRY_DataIgnored &CDetourDis::Copy0F78 }
#define ENTRY_Copy0F00 { ENTRY_DataIgnored &CDetourDis::Copy0F00 } // 32bit x86 only
#define ENTRY_Copy0FB8 { ENTRY_DataIgnored &CDetourDis::Copy0FB8 } // 32bit x86 only
#define ENTRY_Copy66 { ENTRY_DataIgnored &CDetourDis::Copy66 }
#define ENTRY_Copy67 { ENTRY_DataIgnored &CDetourDis::Copy67 }
#define ENTRY_CopyF6 { ENTRY_DataIgnored &CDetourDis::CopyF6 }
#define ENTRY_CopyF7 { ENTRY_DataIgnored &CDetourDis::CopyF7 }
#define ENTRY_CopyFF { ENTRY_DataIgnored &CDetourDis::CopyFF }
#define ENTRY_CopyVex2 { ENTRY_DataIgnored &CDetourDis::CopyVex2 }
#define ENTRY_CopyVex3 { ENTRY_DataIgnored &CDetourDis::CopyVex3 }
#define ENTRY_CopyEvex { ENTRY_DataIgnored &CDetourDis::CopyEvex } // 62, 3 byte payload, then normal with implied prefixes like vex
#define ENTRY_CopyXop { ENTRY_DataIgnored &CDetourDis::CopyXop } // 0x8F ... POP /0 or AMD XOP
#define ENTRY_CopyBytesXop { 5, 5, 4, 0, 0, &CDetourDis::CopyBytes } // 0x8F xop1 xop2 opcode modrm
#define ENTRY_CopyBytesXop1 { 6, 6, 4, 0, 0, &CDetourDis::CopyBytes } // 0x8F xop1 xop2 opcode modrm ... imm8
#define ENTRY_CopyBytesXop4 { 9, 9, 4, 0, 0, &CDetourDis::CopyBytes } // 0x8F xop1 xop2 opcode modrm ... imm32
#define ENTRY_Invalid { ENTRY_DataIgnored &CDetourDis::Invalid }
PBYTE CopyBytes(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyBytesPrefix(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyBytesSegment(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyBytesRax(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyBytesJump(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE Invalid(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE AdjustTarget(PBYTE pbDst, PBYTE pbSrc, UINT cbOp,
UINT cbTargetOffset, UINT cbTargetSize);
protected:
PBYTE Copy0F(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE Copy0F00(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc); // x86 only sldt/0 str/1 lldt/2 ltr/3 err/4 verw/5 jmpe/6/dynamic invalid/7
PBYTE Copy0F78(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc); // vmread, 66/extrq/ib/ib, F2/insertq/ib/ib
PBYTE Copy0FB8(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc); // jmpe or F3/popcnt
PBYTE Copy66(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE Copy67(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyF2(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyF3(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc); // x86 only
PBYTE CopyF6(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyF7(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyFF(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyVex2(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyVex3(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyVexCommon(BYTE m, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyVexEvexCommon(BYTE m, PBYTE pbDst, PBYTE pbSrc, BYTE p);
PBYTE CopyEvex(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
PBYTE CopyXop(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc);
protected:
static const COPYENTRY s_rceCopyTable[];
static const COPYENTRY s_rceCopyTable0F[];
static const BYTE s_rbModRm[256];
static PBYTE s_pbModuleBeg;
static PBYTE s_pbModuleEnd;
static BOOL s_fLimitReferencesToModule;
protected:
BOOL m_bOperandOverride;
BOOL m_bAddressOverride;
BOOL m_bRaxOverride; // AMD64 only
BOOL m_bVex;
BOOL m_bEvex;
BOOL m_bF2;
BOOL m_bF3; // x86 only
BYTE m_nSegmentOverride;
PBYTE * m_ppbTarget;
LONG * m_plExtra;
LONG m_lScratchExtra;
PBYTE m_pbScratchTarget;
BYTE m_rbScratchDst[64]; // matches or exceeds rbCode
};
PVOID WINAPI DetourCopyInstruction(_In_opt_ PVOID pDst,
_Inout_opt_ PVOID *ppDstPool,
_In_ PVOID pSrc,
_Out_opt_ PVOID *ppTarget,
_Out_opt_ LONG *plExtra)
{
UNREFERENCED_PARAMETER(ppDstPool); // x86 & x64 don't use a constant pool.
CDetourDis oDetourDisasm((PBYTE*)ppTarget, plExtra);
return oDetourDisasm.CopyInstruction((PBYTE)pDst, (PBYTE)pSrc);
}
/////////////////////////////////////////////////////////// Disassembler Code.
//
CDetourDis::CDetourDis(_Out_opt_ PBYTE *ppbTarget, _Out_opt_ LONG *plExtra) :
m_bOperandOverride(FALSE),
m_bAddressOverride(FALSE),
m_bRaxOverride(FALSE),
m_bF2(FALSE),
m_bF3(FALSE),
m_bVex(FALSE),
m_bEvex(FALSE)
{
m_ppbTarget = ppbTarget ? ppbTarget : &m_pbScratchTarget;
m_plExtra = plExtra ? plExtra : &m_lScratchExtra;
*m_ppbTarget = (PBYTE)DETOUR_INSTRUCTION_TARGET_NONE;
*m_plExtra = 0;
}
PBYTE CDetourDis::CopyInstruction(PBYTE pbDst, PBYTE pbSrc)
{
// Configure scratch areas if real areas are not available.
if (NULL == pbDst) {
pbDst = m_rbScratchDst;
}
if (NULL == pbSrc) {
// We can't copy a non-existent instruction.
SetLastError(ERROR_INVALID_DATA);
return NULL;
}
// Figure out how big the instruction is, do the appropriate copy,
// and figure out what the target of the instruction is if any.
//
REFCOPYENTRY pEntry = &s_rceCopyTable[pbSrc[0]];
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyBytes(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
UINT nBytesFixed;
if (m_bVex || m_bEvex)
{
ASSERT(pEntry->nFlagBits == 0);
ASSERT(pEntry->nFixedSize == pEntry->nFixedSize16);
}
UINT const nModOffset = pEntry->nModOffset;
UINT const nFlagBits = pEntry->nFlagBits;
UINT const nFixedSize = pEntry->nFixedSize;
UINT const nFixedSize16 = pEntry->nFixedSize16;
if (nFlagBits & ADDRESS) {
nBytesFixed = m_bAddressOverride ? nFixedSize16 : nFixedSize;
}
#ifdef DETOURS_X64
// REX.W trumps 66
else if (m_bRaxOverride) {
nBytesFixed = nFixedSize + ((nFlagBits & RAX) ? 4 : 0);
}
#endif
else {
nBytesFixed = m_bOperandOverride ? nFixedSize16 : nFixedSize;
}
UINT nBytes = nBytesFixed;
UINT nRelOffset = pEntry->nRelOffset;
UINT cbTarget = nBytes - nRelOffset;
if (nModOffset > 0) {
ASSERT(nRelOffset == 0);
BYTE const bModRm = pbSrc[nModOffset];
BYTE const bFlags = s_rbModRm[bModRm];
nBytes += bFlags & NOTSIB;
if (bFlags & SIB) {
BYTE const bSib = pbSrc[nModOffset + 1];
if ((bSib & 0x07) == 0x05) {
if ((bModRm & 0xc0) == 0x00) {
nBytes += 4;
}
else if ((bModRm & 0xc0) == 0x40) {
nBytes += 1;
}
else if ((bModRm & 0xc0) == 0x80) {
nBytes += 4;
}
}
cbTarget = nBytes - nRelOffset;
}
#ifdef DETOURS_X64
else if (bFlags & RIP) {
nRelOffset = nModOffset + 1;
cbTarget = 4;
}
#endif
}
CopyMemory(pbDst, pbSrc, nBytes);
if (nRelOffset) {
*m_ppbTarget = AdjustTarget(pbDst, pbSrc, nBytes, nRelOffset, cbTarget);
#ifdef DETOURS_X64
if (pEntry->nRelOffset == 0) {
// This is a data target, not a code target, so we shouldn't return it.
*m_ppbTarget = NULL;
}
#endif
}
if (nFlagBits & NOENLARGE) {
*m_plExtra = -*m_plExtra;
}
if (nFlagBits & DYNAMIC) {
*m_ppbTarget = (PBYTE)DETOUR_INSTRUCTION_TARGET_DYNAMIC;
}
return pbSrc + nBytes;
}
PBYTE CDetourDis::CopyBytesPrefix(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
pbDst[0] = pbSrc[0];
pEntry = &s_rceCopyTable[pbSrc[1]];
return (this->*pEntry->pfCopy)(pEntry, pbDst + 1, pbSrc + 1);
}
PBYTE CDetourDis::CopyBytesSegment(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
{
m_nSegmentOverride = pbSrc[0];
return CopyBytesPrefix(0, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyBytesRax(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
{ // AMD64 only
if (pbSrc[0] & 0x8) {
m_bRaxOverride = TRUE;
}
return CopyBytesPrefix(0, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyBytesJump(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
(void)pEntry;
PVOID pvSrcAddr = &pbSrc[1];
PVOID pvDstAddr = NULL;
LONG_PTR nOldOffset = (LONG_PTR)*(signed char*&)pvSrcAddr;
LONG_PTR nNewOffset = 0;
*m_ppbTarget = pbSrc + 2 + nOldOffset;
if (pbSrc[0] == 0xeb) {
pbDst[0] = 0xe9;
pvDstAddr = &pbDst[1];
nNewOffset = nOldOffset - ((pbDst - pbSrc) + 3);
*(UNALIGNED LONG*&)pvDstAddr = (LONG)nNewOffset;
*m_plExtra = 3;
return pbSrc + 2;
}
ASSERT(pbSrc[0] >= 0x70 && pbSrc[0] <= 0x7f);
pbDst[0] = 0x0f;
pbDst[1] = 0x80 | (pbSrc[0] & 0xf);
pvDstAddr = &pbDst[2];
nNewOffset = nOldOffset - ((pbDst - pbSrc) + 4);
*(UNALIGNED LONG*&)pvDstAddr = (LONG)nNewOffset;
*m_plExtra = 4;
return pbSrc + 2;
}
PBYTE CDetourDis::AdjustTarget(PBYTE pbDst, PBYTE pbSrc, UINT cbOp,
UINT cbTargetOffset, UINT cbTargetSize)
{
PBYTE pbTarget = NULL;
#if 1 // fault injection to test test code
#if defined(DETOURS_X64)
typedef LONGLONG T;
#else
typedef LONG T;
#endif
T nOldOffset;
T nNewOffset;
PVOID pvTargetAddr = &pbDst[cbTargetOffset];
switch (cbTargetSize) {
case 1:
nOldOffset = *(signed char*&)pvTargetAddr;
break;
case 2:
nOldOffset = *(UNALIGNED SHORT*&)pvTargetAddr;
break;
case 4:
nOldOffset = *(UNALIGNED LONG*&)pvTargetAddr;
break;
#if defined(DETOURS_X64)
case 8:
nOldOffset = *(UNALIGNED LONGLONG*&)pvTargetAddr;
break;
#endif
default:
ASSERT(!"cbTargetSize is invalid.");
nOldOffset = 0;
break;
}
pbTarget = pbSrc + cbOp + nOldOffset;
nNewOffset = nOldOffset - (T)(pbDst - pbSrc);
switch (cbTargetSize) {
case 1:
*(CHAR*&)pvTargetAddr = (CHAR)nNewOffset;
if (nNewOffset < SCHAR_MIN || nNewOffset > SCHAR_MAX) {
*m_plExtra = sizeof(ULONG) - 1;
}
break;
case 2:
*(UNALIGNED SHORT*&)pvTargetAddr = (SHORT)nNewOffset;
if (nNewOffset < SHRT_MIN || nNewOffset > SHRT_MAX) {
*m_plExtra = sizeof(ULONG) - 2;
}
break;
case 4:
*(UNALIGNED LONG*&)pvTargetAddr = (LONG)nNewOffset;
if (nNewOffset < LONG_MIN || nNewOffset > LONG_MAX) {
*m_plExtra = sizeof(ULONG) - 4;
}
break;
#if defined(DETOURS_X64)
case 8:
*(UNALIGNED LONGLONG*&)pvTargetAddr = nNewOffset;
break;
#endif
}
#ifdef DETOURS_X64
// When we are only computing size, source and dest can be
// far apart, distance not encodable in 32bits. Ok.
// At least still check the lower 32bits.
if (pbDst >= m_rbScratchDst && pbDst < (sizeof(m_rbScratchDst) + m_rbScratchDst)) {
ASSERT((((size_t)pbDst + cbOp + nNewOffset) & 0xFFFFFFFF) == (((size_t)pbTarget) & 0xFFFFFFFF));
}
else
#endif
{
ASSERT(pbDst + cbOp + nNewOffset == pbTarget);
}
#endif
return pbTarget;
}
PBYTE CDetourDis::Invalid(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
(void)pbDst;
(void)pEntry;
ASSERT(!"Invalid Instruction");
return pbSrc + 1;
}
////////////////////////////////////////////////////// Individual Bytes Codes.
//
PBYTE CDetourDis::Copy0F(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
pbDst[0] = pbSrc[0];
pEntry = &s_rceCopyTable0F[pbSrc[1]];
return (this->*pEntry->pfCopy)(pEntry, pbDst + 1, pbSrc + 1);
}
PBYTE CDetourDis::Copy0F78(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
{
// vmread, 66/extrq, F2/insertq
static const COPYENTRY vmread = /* 78 */ ENTRY_CopyBytes2Mod;
static const COPYENTRY extrq_insertq = /* 78 */ ENTRY_CopyBytes4;
ASSERT(!(m_bF2 && m_bOperandOverride));
// For insertq and presumably despite documentation extrq, mode must be 11, not checked.
// insertq/extrq/78 are followed by two immediate bytes, and given mode == 11, mod/rm byte is always one byte,
// and the 0x78 makes 4 bytes (not counting the 66/F2/F which are accounted for elsewhere)
REFCOPYENTRY const pEntry = ((m_bF2 || m_bOperandOverride) ? &extrq_insertq : &vmread);
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::Copy0F00(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
{
// jmpe is 32bit x86 only
// Notice that the sizes are the same either way, but jmpe is marked as "dynamic".
static const COPYENTRY other = /* B8 */ ENTRY_CopyBytes2Mod; // sldt/0 str/1 lldt/2 ltr/3 err/4 verw/5 jmpe/6 invalid/7
static const COPYENTRY jmpe = /* B8 */ ENTRY_CopyBytes2ModDynamic; // jmpe/6 x86-on-IA64 syscalls
REFCOPYENTRY const pEntry = (((6 << 3) == ((7 << 3) & pbSrc[1])) ? &jmpe : &other);
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::Copy0FB8(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
{
// jmpe is 32bit x86 only
static const COPYENTRY popcnt = /* B8 */ ENTRY_CopyBytes2Mod;
static const COPYENTRY jmpe = /* B8 */ ENTRY_CopyBytes3Or5Dynamic; // jmpe x86-on-IA64 syscalls
REFCOPYENTRY const pEntry = m_bF3 ? &popcnt : &jmpe;
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::Copy66(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{ // Operand-size override prefix
m_bOperandOverride = TRUE;
return CopyBytesPrefix(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::Copy67(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{ // Address size override prefix
m_bAddressOverride = TRUE;
return CopyBytesPrefix(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyF2(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
m_bF2 = TRUE;
return CopyBytesPrefix(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyF3(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{ // x86 only
m_bF3 = TRUE;
return CopyBytesPrefix(pEntry, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyF6(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
(void)pEntry;
// TEST BYTE /0
if (0x00 == (0x38 & pbSrc[1])) { // reg(bits 543) of ModR/M == 0
static const COPYENTRY ce = /* f6 */ ENTRY_CopyBytes2Mod1;
return (this->*ce.pfCopy)(&ce, pbDst, pbSrc);
}
// DIV /6
// IDIV /7
// IMUL /5
// MUL /4
// NEG /3
// NOT /2
static const COPYENTRY ce = /* f6 */ ENTRY_CopyBytes2Mod;
return (this->*ce.pfCopy)(&ce, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyF7(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{
(void)pEntry;
// TEST WORD /0
if (0x00 == (0x38 & pbSrc[1])) { // reg(bits 543) of ModR/M == 0
static const COPYENTRY ce = /* f7 */ ENTRY_CopyBytes2ModOperand;
return (this->*ce.pfCopy)(&ce, pbDst, pbSrc);
}
// DIV /6
// IDIV /7
// IMUL /5
// MUL /4
// NEG /3
// NOT /2
static const COPYENTRY ce = /* f7 */ ENTRY_CopyBytes2Mod;
return (this->*ce.pfCopy)(&ce, pbDst, pbSrc);
}
PBYTE CDetourDis::CopyFF(REFCOPYENTRY pEntry, PBYTE pbDst, PBYTE pbSrc)
{ // INC /0
// DEC /1
// CALL /2
// CALL /3
// JMP /4
// JMP /5
// PUSH /6
// invalid/7
(void)pEntry;
static const COPYENTRY ce = /* ff */ ENTRY_CopyBytes2Mod;
PBYTE pbOut = (this->*ce.pfCopy)(&ce, pbDst, pbSrc);
BYTE const b1 = pbSrc[1];
if (0x15 == b1 || 0x25 == b1) { // CALL [], JMP []
#ifdef DETOURS_X64
// All segments but FS and GS are equivalent.
if (m_nSegmentOverride != 0x64 && m_nSegmentOverride != 0x65)
#else
if (m_nSegmentOverride == 0 || m_nSegmentOverride == 0x2E)
#endif
{
#ifdef DETOURS_X64
INT32 offset = *(UNALIGNED INT32*)&pbSrc[2];
PBYTE *ppbTarget = (PBYTE *)(pbSrc + 6 + offset);
#else
PBYTE *ppbTarget = (PBYTE *)(SIZE_T)*(UNALIGNED ULONG*)&pbSrc[2];
#endif
if (s_fLimitReferencesToModule &&
(ppbTarget < (PVOID)s_pbModuleBeg || ppbTarget >= (PVOID)s_pbModuleEnd)) {
*m_ppbTarget = (PBYTE)DETOUR_INSTRUCTION_TARGET_DYNAMIC;
}
else {
// This can access violate on random bytes. Use DetourSetCodeModule.
*m_ppbTarget = *ppbTarget;
}
}
else {
*m_ppbTarget = (PBYTE)DETOUR_INSTRUCTION_TARGET_DYNAMIC;
}
}
else if (0x10 == (0x30 & b1) || // CALL /2 or /3 --> reg(bits 543) of ModR/M == 010 or 011
0x20 == (0x30 & b1)) { // JMP /4 or /5 --> reg(bits 543) of ModR/M == 100 or 101
*m_ppbTarget = (PBYTE)DETOUR_INSTRUCTION_TARGET_DYNAMIC;
}
return pbOut;
}
PBYTE CDetourDis::CopyVexEvexCommon(BYTE m, PBYTE pbDst, PBYTE pbSrc, BYTE p)
// m is first instead of last in the hopes of pbDst/pbSrc being
// passed along efficiently in the registers they were already in.
{
static const COPYENTRY ceF38 = /* 38 */ ENTRY_CopyBytes2Mod;
static const COPYENTRY ceF3A = /* 3A */ ENTRY_CopyBytes2Mod1;
static const COPYENTRY ceInvalid = /* C4 */ ENTRY_Invalid;
switch (p & 3) {
case 0: break;
case 1: m_bOperandOverride = TRUE; break;
case 2: m_bF3 = TRUE; break;
case 3: m_bF2 = TRUE; break;
}
REFCOPYENTRY pEntry;
switch (m) {
default: return Invalid(&ceInvalid, pbDst, pbSrc);
case 1: pEntry = &s_rceCopyTable0F[pbSrc[0]];
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
case 2: return CopyBytes(&ceF38, pbDst, pbSrc);
case 3: return CopyBytes(&ceF3A, pbDst, pbSrc);
}
}
PBYTE CDetourDis::CopyVexCommon(BYTE m, PBYTE pbDst, PBYTE pbSrc)
// m is first instead of last in the hopes of pbDst/pbSrc being
// passed along efficiently in the registers they were already in.
{
m_bVex = TRUE;
BYTE const p = (BYTE)(pbSrc[-1] & 3); // p in last byte
return CopyVexEvexCommon(m, pbDst, pbSrc, p);
}
PBYTE CDetourDis::CopyVex3(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
// 3 byte VEX prefix 0xC4
{
#ifdef DETOURS_X86
const static COPYENTRY ceLES = /* C4 */ ENTRY_CopyBytes2Mod;
if ((pbSrc[1] & 0xC0) != 0xC0) {
REFCOPYENTRY pEntry = &ceLES;
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
}
#endif
pbDst[0] = pbSrc[0];
pbDst[1] = pbSrc[1];
pbDst[2] = pbSrc[2];
#ifdef DETOURS_X64
m_bRaxOverride |= !!(pbSrc[2] & 0x80); // w in last byte, see CopyBytesRax
#else
//
// TODO
//
// Usually the VEX.W bit changes the size of a general purpose register and is ignored for 32bit.
// Sometimes it is an opcode extension.
// Look in the Intel manual, in the instruction-by-instruction reference, for ".W1",
// without nearby wording saying it is ignored for 32bit.
// For example: "VFMADD132PD/VFMADD213PD/VFMADD231PD Fused Multiply-Add of Packed Double-Precision Floating-Point Values".
//
// Then, go through each such case and determine if W0 vs. W1 affect the size of the instruction. Probably not.
// Look for the same encoding but with "W1" changed to "W0".
// Here is one such pairing:
// VFMADD132PD/VFMADD213PD/VFMADD231PD Fused Multiply-Add of Packed Double-Precision Floating-Point Values
//
// VEX.DDS.128.66.0F38.W1 98 /r A V/V FMA Multiply packed double-precision floating-point values
// from xmm0 and xmm2/mem, add to xmm1 and
// put result in xmm0.
// VFMADD132PD xmm0, xmm1, xmm2/m128
//
// VFMADD132PS/VFMADD213PS/VFMADD231PS Fused Multiply-Add of Packed Single-Precision Floating-Point Values
// VEX.DDS.128.66.0F38.W0 98 /r A V/V FMA Multiply packed single-precision floating-point values
// from xmm0 and xmm2/mem, add to xmm1 and put
// result in xmm0.
// VFMADD132PS xmm0, xmm1, xmm2/m128
//
#endif
return CopyVexCommon(pbSrc[1] & 0x1F, pbDst + 3, pbSrc + 3);
}
PBYTE CDetourDis::CopyVex2(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
// 2 byte VEX prefix 0xC5
{
#ifdef DETOURS_X86
const static COPYENTRY ceLDS = /* C5 */ ENTRY_CopyBytes2Mod;
if ((pbSrc[1] & 0xC0) != 0xC0) {
REFCOPYENTRY pEntry = &ceLDS;
return (this->*pEntry->pfCopy)(pEntry, pbDst, pbSrc);
}
#endif
pbDst[0] = pbSrc[0];
pbDst[1] = pbSrc[1];
return CopyVexCommon(1, pbDst + 2, pbSrc + 2);
}
PBYTE CDetourDis::CopyEvex(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
// 62, 3 byte payload, x86 with implied prefixes like Vex
// for 32bit, mode 0xC0 else fallback to bound /r
{
// NOTE: Intel and Wikipedia number these differently.
// Intel says 0-2, Wikipedia says 1-3.
BYTE const p0 = pbSrc[1];
#ifdef DETOURS_X86
const static COPYENTRY ceBound = /* 62 */ ENTRY_CopyBytes2Mod;
if ((p0 & 0xC0) != 0xC0) {
return CopyBytes(&ceBound, pbDst, pbSrc);
}
#endif
static const COPYENTRY ceInvalid = /* 62 */ ENTRY_Invalid;
if ((p0 & 0x0C) != 0)
return Invalid(&ceInvalid, pbDst, pbSrc);
BYTE const p1 = pbSrc[2];
if ((p1 & 0x04) != 0x04)
return Invalid(&ceInvalid, pbDst, pbSrc);
// Copy 4 byte prefix.
*(UNALIGNED ULONG *)pbDst = *(UNALIGNED ULONG*)pbSrc;
m_bEvex = TRUE;
#ifdef DETOURS_X64
m_bRaxOverride |= !!(p1 & 0x80); // w
#endif
return CopyVexEvexCommon(p0 & 3u, pbDst + 4, pbSrc + 4, p1 & 3u);
}
PBYTE CDetourDis::CopyXop(REFCOPYENTRY, PBYTE pbDst, PBYTE pbSrc)
/* 3 byte AMD XOP prefix 0x8F
byte0: 0x8F
byte1: RXBmmmmm
byte2: WvvvvLpp
byte3: opcode
mmmmm >= 8, else pop
mmmmm only otherwise defined for 8, 9, A.
pp is like VEX but only instructions with 0 are defined
*/
{
const static COPYENTRY cePop = /* 8F */ ENTRY_CopyBytes2Mod;
const static COPYENTRY ceXop = /* 8F */ ENTRY_CopyBytesXop;
const static COPYENTRY ceXop1 = /* 8F */ ENTRY_CopyBytesXop1;
const static COPYENTRY ceXop4 = /* 8F */ ENTRY_CopyBytesXop4;
BYTE const m = (BYTE)(pbSrc[1] & 0x1F);
ASSERT(m <= 10);
switch (m)
{
default:
return CopyBytes(&cePop, pbDst, pbSrc);
case 8: // modrm with 8bit immediate
return CopyBytes(&ceXop1, pbDst, pbSrc);
case 9: // modrm with no immediate
return CopyBytes(&ceXop, pbDst, pbSrc);
case 10: // modrm with 32bit immediate
return CopyBytes(&ceXop4, pbDst, pbSrc);
}
}
//////////////////////////////////////////////////////////////////////////////
//
PBYTE CDetourDis::s_pbModuleBeg = NULL;
PBYTE CDetourDis::s_pbModuleEnd = (PBYTE)~(ULONG_PTR)0;
BOOL CDetourDis::s_fLimitReferencesToModule = FALSE;
BOOL CDetourDis::SetCodeModule(PBYTE pbBeg, PBYTE pbEnd, BOOL fLimitReferencesToModule)
{
if (pbEnd < pbBeg) {
return FALSE;
}
s_pbModuleBeg = pbBeg;
s_pbModuleEnd = pbEnd;
s_fLimitReferencesToModule = fLimitReferencesToModule;
return TRUE;
}
///////////////////////////////////////////////////////// Disassembler Tables.
//
const BYTE CDetourDis::s_rbModRm[256] = {
0,0,0,0, SIB|1,RIP|4,0,0, 0,0,0,0, SIB|1,RIP|4,0,0, // 0x
0,0,0,0, SIB|1,RIP|4,0,0, 0,0,0,0, SIB|1,RIP|4,0,0, // 1x
0,0,0,0, SIB|1,RIP|4,0,0, 0,0,0,0, SIB|1,RIP|4,0,0, // 2x
0,0,0,0, SIB|1,RIP|4,0,0, 0,0,0,0, SIB|1,RIP|4,0,0, // 3x
1,1,1,1, 2,1,1,1, 1,1,1,1, 2,1,1,1, // 4x
1,1,1,1, 2,1,1,1, 1,1,1,1, 2,1,1,1, // 5x
1,1,1,1, 2,1,1,1, 1,1,1,1, 2,1,1,1, // 6x
1,1,1,1, 2,1,1,1, 1,1,1,1, 2,1,1,1, // 7x
4,4,4,4, 5,4,4,4, 4,4,4,4, 5,4,4,4, // 8x
4,4,4,4, 5,4,4,4, 4,4,4,4, 5,4,4,4, // 9x
4,4,4,4, 5,4,4,4, 4,4,4,4, 5,4,4,4, // Ax
4,4,4,4, 5,4,4,4, 4,4,4,4, 5,4,4,4, // Bx
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, // Cx
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, // Dx
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, // Ex
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 // Fx
};
const CDetourDis::COPYENTRY CDetourDis::s_rceCopyTable[] =
{
/* 00 */ ENTRY_CopyBytes2Mod, // ADD /r
/* 01 */ ENTRY_CopyBytes2Mod, // ADD /r
/* 02 */ ENTRY_CopyBytes2Mod, // ADD /r
/* 03 */ ENTRY_CopyBytes2Mod, // ADD /r
/* 04 */ ENTRY_CopyBytes2, // ADD ib
/* 05 */ ENTRY_CopyBytes3Or5, // ADD iw
#ifdef DETOURS_X64
/* 06 */ ENTRY_Invalid, // Invalid
/* 07 */ ENTRY_Invalid, // Invalid
#else
/* 06 */ ENTRY_CopyBytes1, // PUSH
/* 07 */ ENTRY_CopyBytes1, // POP
#endif
/* 08 */ ENTRY_CopyBytes2Mod, // OR /r
/* 09 */ ENTRY_CopyBytes2Mod, // OR /r
/* 0A */ ENTRY_CopyBytes2Mod, // OR /r
/* 0B */ ENTRY_CopyBytes2Mod, // OR /r
/* 0C */ ENTRY_CopyBytes2, // OR ib
/* 0D */ ENTRY_CopyBytes3Or5, // OR iw
#ifdef DETOURS_X64
/* 0E */ ENTRY_Invalid, // Invalid
#else
/* 0E */ ENTRY_CopyBytes1, // PUSH
#endif
/* 0F */ ENTRY_Copy0F, // Extension Ops
/* 10 */ ENTRY_CopyBytes2Mod, // ADC /r
/* 11 */ ENTRY_CopyBytes2Mod, // ADC /r
/* 12 */ ENTRY_CopyBytes2Mod, // ADC /r
/* 13 */ ENTRY_CopyBytes2Mod, // ADC /r
/* 14 */ ENTRY_CopyBytes2, // ADC ib
/* 15 */ ENTRY_CopyBytes3Or5, // ADC id
#ifdef DETOURS_X64
/* 16 */ ENTRY_Invalid, // Invalid
/* 17 */ ENTRY_Invalid, // Invalid
#else
/* 16 */ ENTRY_CopyBytes1, // PUSH
/* 17 */ ENTRY_CopyBytes1, // POP
#endif
/* 18 */ ENTRY_CopyBytes2Mod, // SBB /r
/* 19 */ ENTRY_CopyBytes2Mod, // SBB /r
/* 1A */ ENTRY_CopyBytes2Mod, // SBB /r
/* 1B */ ENTRY_CopyBytes2Mod, // SBB /r
/* 1C */ ENTRY_CopyBytes2, // SBB ib