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detours.cpp
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detours.cpp
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//////////////////////////////////////////////////////////////////////////////
//
// Core Detours Functionality (detours.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"
#if DETOURS_VERSION != 0x4c0c1 // 0xMAJORcMINORcPATCH
#error detours.h version mismatch
#endif
#define NOTHROW
//////////////////////////////////////////////////////////////////////////////
//
struct _DETOUR_ALIGN
{
BYTE obTarget : 3;
BYTE obTrampoline : 5;
};
C_ASSERT(sizeof(_DETOUR_ALIGN) == 1);
//////////////////////////////////////////////////////////////////////////////
//
// Region reserved for system DLLs, which cannot be used for trampolines.
//
static PVOID s_pSystemRegionLowerBound = (PVOID)(ULONG_PTR)0x70000000;
static PVOID s_pSystemRegionUpperBound = (PVOID)(ULONG_PTR)0x80000000;
//////////////////////////////////////////////////////////////////////////////
//
static bool detour_is_imported(PBYTE pbCode, PBYTE pbAddress)
{
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery((PVOID)pbCode, &mbi, sizeof(mbi));
__try {
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)mbi.AllocationBase;
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
return false;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
return false;
}
if (pbAddress >= ((PBYTE)pDosHeader +
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress) &&
pbAddress < ((PBYTE)pDosHeader +
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress +
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size)) {
return true;
}
}
#pragma prefast(suppress:28940, "A bad pointer means this probably isn't a PE header.")
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return false;
}
return false;
}
inline ULONG_PTR detour_2gb_below(ULONG_PTR address)
{
return (address > (ULONG_PTR)0x7ff80000) ? address - 0x7ff80000 : 0x80000;
}
inline ULONG_PTR detour_2gb_above(ULONG_PTR address)
{
#if defined(DETOURS_64BIT)
return (address < (ULONG_PTR)0xffffffff80000000) ? address + 0x7ff80000 : (ULONG_PTR)0xfffffffffff80000;
#else
return (address < (ULONG_PTR)0x80000000) ? address + 0x7ff80000 : (ULONG_PTR)0xfff80000;
#endif
}
///////////////////////////////////////////////////////////////////////// X86.
//
#ifdef DETOURS_X86
struct _DETOUR_TRAMPOLINE
{
BYTE rbCode[30]; // target code + jmp to pbRemain
BYTE cbCode; // size of moved target code.
BYTE cbCodeBreak; // padding to make debugging easier.
BYTE rbRestore[22]; // original target code.
BYTE cbRestore; // size of original target code.
BYTE cbRestoreBreak; // padding to make debugging easier.
_DETOUR_ALIGN rAlign[8]; // instruction alignment array.
PBYTE pbRemain; // first instruction after moved code. [free list]
PBYTE pbDetour; // first instruction of detour function.
};
C_ASSERT(sizeof(_DETOUR_TRAMPOLINE) == 72);
enum {
SIZE_OF_JMP = 5
};
inline PBYTE detour_gen_jmp_immediate(PBYTE pbCode, PBYTE pbJmpVal)
{
PBYTE pbJmpSrc = pbCode + 5;
*pbCode++ = 0xE9; // jmp +imm32
*((INT32*&)pbCode)++ = (INT32)(pbJmpVal - pbJmpSrc);
return pbCode;
}
inline PBYTE detour_gen_jmp_indirect(PBYTE pbCode, PBYTE *ppbJmpVal)
{
*pbCode++ = 0xff; // jmp [+imm32]
*pbCode++ = 0x25;
*((INT32*&)pbCode)++ = (INT32)((PBYTE)ppbJmpVal);
return pbCode;
}
inline PBYTE detour_gen_brk(PBYTE pbCode, PBYTE pbLimit)
{
while (pbCode < pbLimit) {
*pbCode++ = 0xcc; // brk;
}
return pbCode;
}
inline PBYTE detour_skip_jmp(PBYTE pbCode, PVOID *ppGlobals)
{
if (pbCode == NULL) {
return NULL;
}
if (ppGlobals != NULL) {
*ppGlobals = NULL;
}
// First, skip over the import vector if there is one.
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [imm32]
// Looks like an import alias jump, then get the code it points to.
PBYTE pbTarget = *(UNALIGNED PBYTE *)&pbCode[2];
if (detour_is_imported(pbCode, pbTarget)) {
PBYTE pbNew = *(UNALIGNED PBYTE *)pbTarget;
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
// Then, skip over a patch jump
if (pbCode[0] == 0xeb) { // jmp +imm8
PBYTE pbNew = pbCode + 2 + *(CHAR *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over short jump.\n", pbCode, pbNew));
pbCode = pbNew;
// First, skip over the import vector if there is one.
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [imm32]
// Looks like an import alias jump, then get the code it points to.
PBYTE pbTarget = *(UNALIGNED PBYTE *)&pbCode[2];
if (detour_is_imported(pbCode, pbTarget)) {
pbNew = *(UNALIGNED PBYTE *)pbTarget;
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
// Finally, skip over a long jump if it is the target of the patch jump.
else if (pbCode[0] == 0xe9) { // jmp +imm32
pbNew = pbCode + 5 + *(UNALIGNED INT32 *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over long jump.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
return pbCode;
}
inline void detour_find_jmp_bounds(PBYTE pbCode,
PDETOUR_TRAMPOLINE *ppLower,
PDETOUR_TRAMPOLINE *ppUpper)
{
// We have to place trampolines within +/- 2GB of code.
ULONG_PTR lo = detour_2gb_below((ULONG_PTR)pbCode);
ULONG_PTR hi = detour_2gb_above((ULONG_PTR)pbCode);
DETOUR_TRACE(("[%p..%p..%p]\n", lo, pbCode, hi));
// And, within +/- 2GB of relative jmp targets.
if (pbCode[0] == 0xe9) { // jmp +imm32
PBYTE pbNew = pbCode + 5 + *(UNALIGNED INT32 *)&pbCode[1];
if (pbNew < pbCode) {
hi = detour_2gb_above((ULONG_PTR)pbNew);
}
else {
lo = detour_2gb_below((ULONG_PTR)pbNew);
}
DETOUR_TRACE(("[%p..%p..%p] +imm32\n", lo, pbCode, hi));
}
*ppLower = (PDETOUR_TRAMPOLINE)lo;
*ppUpper = (PDETOUR_TRAMPOLINE)hi;
}
inline BOOL detour_does_code_end_function(PBYTE pbCode)
{
if (pbCode[0] == 0xeb || // jmp +imm8
pbCode[0] == 0xe9 || // jmp +imm32
pbCode[0] == 0xe0 || // jmp eax
pbCode[0] == 0xc2 || // ret +imm8
pbCode[0] == 0xc3 || // ret
pbCode[0] == 0xcc) { // brk
return TRUE;
}
else if (pbCode[0] == 0xf3 && pbCode[1] == 0xc3) { // rep ret
return TRUE;
}
else if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [+imm32]
return TRUE;
}
else if ((pbCode[0] == 0x26 || // jmp es:
pbCode[0] == 0x2e || // jmp cs:
pbCode[0] == 0x36 || // jmp ss:
pbCode[0] == 0x3e || // jmp ds:
pbCode[0] == 0x64 || // jmp fs:
pbCode[0] == 0x65) && // jmp gs:
pbCode[1] == 0xff && // jmp [+imm32]
pbCode[2] == 0x25) {
return TRUE;
}
return FALSE;
}
inline ULONG detour_is_code_filler(PBYTE pbCode)
{
// 1-byte through 11-byte NOPs.
if (pbCode[0] == 0x90) {
return 1;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x90) {
return 2;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x00) {
return 3;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x40 &&
pbCode[3] == 0x00) {
return 4;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x44 &&
pbCode[3] == 0x00 && pbCode[4] == 0x00) {
return 5;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x0F && pbCode[2] == 0x1F &&
pbCode[3] == 0x44 && pbCode[4] == 0x00 && pbCode[5] == 0x00) {
return 6;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x80 &&
pbCode[3] == 0x00 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00) {
return 7;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x84 &&
pbCode[3] == 0x00 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00) {
return 8;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x0F && pbCode[2] == 0x1F &&
pbCode[3] == 0x84 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00) {
return 9;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x66 && pbCode[2] == 0x0F &&
pbCode[3] == 0x1F && pbCode[4] == 0x84 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00 &&
pbCode[9] == 0x00) {
return 10;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x66 && pbCode[2] == 0x66 &&
pbCode[3] == 0x0F && pbCode[4] == 0x1F && pbCode[5] == 0x84 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00 &&
pbCode[9] == 0x00 && pbCode[10] == 0x00) {
return 11;
}
// int 3.
if (pbCode[0] == 0xcc) {
return 1;
}
return 0;
}
#endif // DETOURS_X86
///////////////////////////////////////////////////////////////////////// X64.
//
#ifdef DETOURS_X64
struct _DETOUR_TRAMPOLINE
{
// An X64 instuction can be 15 bytes long.
// In practice 11 seems to be the limit.
BYTE rbCode[30]; // target code + jmp to pbRemain.
BYTE cbCode; // size of moved target code.
BYTE cbCodeBreak; // padding to make debugging easier.
BYTE rbRestore[30]; // original target code.
BYTE cbRestore; // size of original target code.
BYTE cbRestoreBreak; // padding to make debugging easier.
_DETOUR_ALIGN rAlign[8]; // instruction alignment array.
PBYTE pbRemain; // first instruction after moved code. [free list]
PBYTE pbDetour; // first instruction of detour function.
BYTE rbCodeIn[8]; // jmp [pbDetour]
};
C_ASSERT(sizeof(_DETOUR_TRAMPOLINE) == 96);
enum {
SIZE_OF_JMP = 5
};
inline PBYTE detour_gen_jmp_immediate(PBYTE pbCode, PBYTE pbJmpVal)
{
PBYTE pbJmpSrc = pbCode + 5;
*pbCode++ = 0xE9; // jmp +imm32
*((INT32*&)pbCode)++ = (INT32)(pbJmpVal - pbJmpSrc);
return pbCode;
}
inline PBYTE detour_gen_jmp_indirect(PBYTE pbCode, PBYTE *ppbJmpVal)
{
PBYTE pbJmpSrc = pbCode + 6;
*pbCode++ = 0xff; // jmp [+imm32]
*pbCode++ = 0x25;
*((INT32*&)pbCode)++ = (INT32)((PBYTE)ppbJmpVal - pbJmpSrc);
return pbCode;
}
inline PBYTE detour_gen_brk(PBYTE pbCode, PBYTE pbLimit)
{
while (pbCode < pbLimit) {
*pbCode++ = 0xcc; // brk;
}
return pbCode;
}
inline PBYTE detour_skip_jmp(PBYTE pbCode, PVOID *ppGlobals)
{
if (pbCode == NULL) {
return NULL;
}
if (ppGlobals != NULL) {
*ppGlobals = NULL;
}
// First, skip over the import vector if there is one.
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [+imm32]
// Looks like an import alias jump, then get the code it points to.
PBYTE pbTarget = pbCode + 6 + *(UNALIGNED INT32 *)&pbCode[2];
if (detour_is_imported(pbCode, pbTarget)) {
PBYTE pbNew = *(UNALIGNED PBYTE *)pbTarget;
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
// Then, skip over a patch jump
if (pbCode[0] == 0xeb) { // jmp +imm8
PBYTE pbNew = pbCode + 2 + *(CHAR *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over short jump.\n", pbCode, pbNew));
pbCode = pbNew;
// First, skip over the import vector if there is one.
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [+imm32]
// Looks like an import alias jump, then get the code it points to.
PBYTE pbTarget = pbCode + 6 + *(UNALIGNED INT32 *)&pbCode[2];
if (detour_is_imported(pbCode, pbTarget)) {
pbNew = *(UNALIGNED PBYTE *)pbTarget;
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
// Finally, skip over a long jump if it is the target of the patch jump.
else if (pbCode[0] == 0xe9) { // jmp +imm32
pbNew = pbCode + 5 + *(UNALIGNED INT32 *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over long jump.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
return pbCode;
}
inline void detour_find_jmp_bounds(PBYTE pbCode,
PDETOUR_TRAMPOLINE *ppLower,
PDETOUR_TRAMPOLINE *ppUpper)
{
// We have to place trampolines within +/- 2GB of code.
ULONG_PTR lo = detour_2gb_below((ULONG_PTR)pbCode);
ULONG_PTR hi = detour_2gb_above((ULONG_PTR)pbCode);
DETOUR_TRACE(("[%p..%p..%p]\n", lo, pbCode, hi));
// And, within +/- 2GB of relative jmp vectors.
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [+imm32]
PBYTE pbNew = pbCode + 6 + *(UNALIGNED INT32 *)&pbCode[2];
if (pbNew < pbCode) {
hi = detour_2gb_above((ULONG_PTR)pbNew);
}
else {
lo = detour_2gb_below((ULONG_PTR)pbNew);
}
DETOUR_TRACE(("[%p..%p..%p] [+imm32]\n", lo, pbCode, hi));
}
// And, within +/- 2GB of relative jmp targets.
else if (pbCode[0] == 0xe9) { // jmp +imm32
PBYTE pbNew = pbCode + 5 + *(UNALIGNED INT32 *)&pbCode[1];
if (pbNew < pbCode) {
hi = detour_2gb_above((ULONG_PTR)pbNew);
}
else {
lo = detour_2gb_below((ULONG_PTR)pbNew);
}
DETOUR_TRACE(("[%p..%p..%p] +imm32\n", lo, pbCode, hi));
}
*ppLower = (PDETOUR_TRAMPOLINE)lo;
*ppUpper = (PDETOUR_TRAMPOLINE)hi;
}
inline BOOL detour_does_code_end_function(PBYTE pbCode)
{
if (pbCode[0] == 0xeb || // jmp +imm8
pbCode[0] == 0xe9 || // jmp +imm32
pbCode[0] == 0xe0 || // jmp eax
pbCode[0] == 0xc2 || // ret +imm8
pbCode[0] == 0xc3 || // ret
pbCode[0] == 0xcc) { // brk
return TRUE;
}
else if (pbCode[0] == 0xf3 && pbCode[1] == 0xc3) { // rep ret
return TRUE;
}
else if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [+imm32]
return TRUE;
}
else if ((pbCode[0] == 0x26 || // jmp es:
pbCode[0] == 0x2e || // jmp cs:
pbCode[0] == 0x36 || // jmp ss:
pbCode[0] == 0x3e || // jmp ds:
pbCode[0] == 0x64 || // jmp fs:
pbCode[0] == 0x65) && // jmp gs:
pbCode[1] == 0xff && // jmp [+imm32]
pbCode[2] == 0x25) {
return TRUE;
}
return FALSE;
}
inline ULONG detour_is_code_filler(PBYTE pbCode)
{
// 1-byte through 11-byte NOPs.
if (pbCode[0] == 0x90) {
return 1;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x90) {
return 2;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x00) {
return 3;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x40 &&
pbCode[3] == 0x00) {
return 4;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x44 &&
pbCode[3] == 0x00 && pbCode[4] == 0x00) {
return 5;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x0F && pbCode[2] == 0x1F &&
pbCode[3] == 0x44 && pbCode[4] == 0x00 && pbCode[5] == 0x00) {
return 6;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x80 &&
pbCode[3] == 0x00 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00) {
return 7;
}
if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x84 &&
pbCode[3] == 0x00 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00) {
return 8;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x0F && pbCode[2] == 0x1F &&
pbCode[3] == 0x84 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00) {
return 9;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x66 && pbCode[2] == 0x0F &&
pbCode[3] == 0x1F && pbCode[4] == 0x84 && pbCode[5] == 0x00 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00 &&
pbCode[9] == 0x00) {
return 10;
}
if (pbCode[0] == 0x66 && pbCode[1] == 0x66 && pbCode[2] == 0x66 &&
pbCode[3] == 0x0F && pbCode[4] == 0x1F && pbCode[5] == 0x84 &&
pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00 &&
pbCode[9] == 0x00 && pbCode[10] == 0x00) {
return 11;
}
// int 3.
if (pbCode[0] == 0xcc) {
return 1;
}
return 0;
}
#endif // DETOURS_X64
//////////////////////////////////////////////////////////////////////// IA64.
//
#ifdef DETOURS_IA64
struct _DETOUR_TRAMPOLINE
{
// On the IA64, a trampoline is used for both incoming and outgoing calls.
//
// The trampoline contains the following bundles for the outgoing call:
// movl gp=target_gp;
// <relocated target bundle>
// brl target_code;
//
// The trampoline contains the following bundles for the incoming call:
// alloc r41=ar.pfs, b, 0, 8, 0
// mov r40=rp
//
// adds r50=0, r39
// adds r49=0, r38
// adds r48=0, r37 ;;
//
// adds r47=0, r36
// adds r46=0, r35
// adds r45=0, r34
//
// adds r44=0, r33
// adds r43=0, r32
// adds r42=0, gp ;;
//
// movl gp=ffffffff`ffffffff ;;
//
// brl.call.sptk.few rp=disas!TestCodes+20e0 (00000000`00404ea0) ;;
//
// adds gp=0, r42
// mov rp=r40, +0 ;;
// mov.i ar.pfs=r41
//
// br.ret.sptk.many rp ;;
//
// This way, we only have to relocate a single bundle.
//
// The complicated incoming trampoline is required because we have to
// create an additional stack frame so that we save and restore the gp.
// We must do this because gp is a caller-saved register, but not saved
// if the caller thinks the target is in the same DLL, which changes
// when we insert a detour.
//
DETOUR_IA64_BUNDLE bMovlTargetGp; // Bundle which sets target GP
BYTE rbCode[sizeof(DETOUR_IA64_BUNDLE)]; // moved bundle.
DETOUR_IA64_BUNDLE bBrlRemainEip; // Brl to pbRemain
// This must be adjacent to bBranchIslands.
// Each instruction in the moved bundle could be a IP-relative chk or branch or call.
// Any such instructions are changed to point to a brl in bBranchIslands.
// This must be adjacent to bBrlRemainEip -- see "pbPool".
DETOUR_IA64_BUNDLE bBranchIslands[DETOUR_IA64_INSTRUCTIONS_PER_BUNDLE];
// Target of brl inserted in target function
DETOUR_IA64_BUNDLE bAllocFrame; // alloc frame
DETOUR_IA64_BUNDLE bSave37to39; // save r37, r38, r39.
DETOUR_IA64_BUNDLE bSave34to36; // save r34, r35, r36.
DETOUR_IA64_BUNDLE bSaveGPto33; // save gp, r32, r33.
DETOUR_IA64_BUNDLE bMovlDetourGp; // set detour GP.
DETOUR_IA64_BUNDLE bCallDetour; // call detour.
DETOUR_IA64_BUNDLE bPopFrameGp; // pop frame and restore gp.
DETOUR_IA64_BUNDLE bReturn; // return to caller.
PLABEL_DESCRIPTOR pldTrampoline;
BYTE rbRestore[sizeof(DETOUR_IA64_BUNDLE)]; // original target bundle.
BYTE cbRestore; // size of original target code.
BYTE cbCode; // size of moved target code.
_DETOUR_ALIGN rAlign[14]; // instruction alignment array.
PBYTE pbRemain; // first instruction after moved code. [free list]
PBYTE pbDetour; // first instruction of detour function.
PPLABEL_DESCRIPTOR ppldDetour; // [pbDetour,gpDetour]
PPLABEL_DESCRIPTOR ppldTarget; // [pbTarget,gpDetour]
};
C_ASSERT(sizeof(DETOUR_IA64_BUNDLE) == 16);
C_ASSERT(sizeof(_DETOUR_TRAMPOLINE) == 256 + DETOUR_IA64_INSTRUCTIONS_PER_BUNDLE * 16);
enum {
SIZE_OF_JMP = sizeof(DETOUR_IA64_BUNDLE)
};
inline PBYTE detour_skip_jmp(PBYTE pPointer, PVOID *ppGlobals)
{
PBYTE pGlobals = NULL;
PBYTE pbCode = NULL;
if (pPointer != NULL) {
PPLABEL_DESCRIPTOR ppld = (PPLABEL_DESCRIPTOR)pPointer;
pbCode = (PBYTE)ppld->EntryPoint;
pGlobals = (PBYTE)ppld->GlobalPointer;
}
if (ppGlobals != NULL) {
*ppGlobals = pGlobals;
}
if (pbCode == NULL) {
return NULL;
}
DETOUR_IA64_BUNDLE *pb = (DETOUR_IA64_BUNDLE *)pbCode;
// IA64 Local Import Jumps look like:
// addl r2=ffffffff`ffe021c0, gp ;;
// ld8 r2=[r2]
// nop.i 0 ;;
//
// ld8 r3=[r2], 8 ;;
// ld8 gp=[r2]
// mov b6=r3, +0
//
// nop.m 0
// nop.i 0
// br.cond.sptk.few b6
//
// 002024000200100b
if ((pb[0].wide[0] & 0xfffffc000603ffff) == 0x002024000200100b &&
pb[0].wide[1] == 0x0004000000203008 &&
pb[1].wide[0] == 0x001014180420180a &&
pb[1].wide[1] == 0x07000830c0203008 &&
pb[2].wide[0] == 0x0000000100000010 &&
pb[2].wide[1] == 0x0080006000000200) {
ULONG64 offset =
((pb[0].wide[0] & 0x0000000001fc0000) >> 18) | // imm7b
((pb[0].wide[0] & 0x000001ff00000000) >> 25) | // imm9d
((pb[0].wide[0] & 0x00000000f8000000) >> 11); // imm5c
if (pb[0].wide[0] & 0x0000020000000000) { // sign
offset |= 0xffffffffffe00000;
}
PBYTE pbTarget = pGlobals + offset;
DETOUR_TRACE(("%p: potential import jump, target=%p\n", pb, pbTarget));
if (detour_is_imported(pbCode, pbTarget) && *(PBYTE*)pbTarget != NULL) {
DETOUR_TRACE(("%p: is import jump, label=%p\n", pb, *(PBYTE *)pbTarget));
PPLABEL_DESCRIPTOR ppld = (PPLABEL_DESCRIPTOR)*(PBYTE *)pbTarget;
pbCode = (PBYTE)ppld->EntryPoint;
pGlobals = (PBYTE)ppld->GlobalPointer;
if (ppGlobals != NULL) {
*ppGlobals = pGlobals;
}
}
}
return pbCode;
}
inline void detour_find_jmp_bounds(PBYTE pbCode,
PDETOUR_TRAMPOLINE *ppLower,
PDETOUR_TRAMPOLINE *ppUpper)
{
(void)pbCode;
*ppLower = (PDETOUR_TRAMPOLINE)(ULONG_PTR)0x0000000000080000;
*ppUpper = (PDETOUR_TRAMPOLINE)(ULONG_PTR)0xfffffffffff80000;
}
inline BOOL detour_does_code_end_function(PBYTE pbCode)
{
// Routine not needed on IA64.
(void)pbCode;
return FALSE;
}
inline ULONG detour_is_code_filler(PBYTE pbCode)
{
// Routine not needed on IA64.
(void)pbCode;
return 0;
}
#endif // DETOURS_IA64
#ifdef DETOURS_ARM
struct _DETOUR_TRAMPOLINE
{
// A Thumb-2 instruction can be 2 or 4 bytes long.
BYTE rbCode[62]; // target code + jmp to pbRemain
BYTE cbCode; // size of moved target code.
BYTE cbCodeBreak; // padding to make debugging easier.
BYTE rbRestore[22]; // original target code.
BYTE cbRestore; // size of original target code.
BYTE cbRestoreBreak; // padding to make debugging easier.
_DETOUR_ALIGN rAlign[8]; // instruction alignment array.
PBYTE pbRemain; // first instruction after moved code. [free list]
PBYTE pbDetour; // first instruction of detour function.
};
C_ASSERT(sizeof(_DETOUR_TRAMPOLINE) == 104);
enum {
SIZE_OF_JMP = 8
};
inline PBYTE align4(PBYTE pValue)
{
return (PBYTE)(((ULONG)pValue) & ~(ULONG)3u);
}
inline ULONG fetch_thumb_opcode(PBYTE pbCode)
{
ULONG Opcode = *(UINT16 *)&pbCode[0];
if (Opcode >= 0xe800) {
Opcode = (Opcode << 16) | *(UINT16 *)&pbCode[2];
}
return Opcode;
}
inline void write_thumb_opcode(PBYTE &pbCode, ULONG Opcode)
{
if (Opcode >= 0x10000) {
*((UINT16*&)pbCode)++ = Opcode >> 16;
}
*((UINT16*&)pbCode)++ = (UINT16)Opcode;
}
PBYTE detour_gen_jmp_immediate(PBYTE pbCode, PBYTE *ppPool, PBYTE pbJmpVal)
{
PBYTE pbLiteral;
if (ppPool != NULL) {
*ppPool = *ppPool - 4;
pbLiteral = *ppPool;
}
else {
pbLiteral = align4(pbCode + 6);
}
*((PBYTE*&)pbLiteral) = DETOURS_PBYTE_TO_PFUNC(pbJmpVal);
LONG delta = pbLiteral - align4(pbCode + 4);
write_thumb_opcode(pbCode, 0xf8dff000 | delta); // LDR PC,[PC+n]
if (ppPool == NULL) {
if (((ULONG)pbCode & 2) != 0) {
write_thumb_opcode(pbCode, 0xdefe); // BREAK
}
pbCode += 4;
}
return pbCode;
}
inline PBYTE detour_gen_brk(PBYTE pbCode, PBYTE pbLimit)
{
while (pbCode < pbLimit) {
write_thumb_opcode(pbCode, 0xdefe);
}
return pbCode;
}
inline PBYTE detour_skip_jmp(PBYTE pbCode, PVOID *ppGlobals)
{
if (pbCode == NULL) {
return NULL;
}
if (ppGlobals != NULL) {
*ppGlobals = NULL;
}
// Skip over the import jump if there is one.
pbCode = (PBYTE)DETOURS_PFUNC_TO_PBYTE(pbCode);
ULONG Opcode = fetch_thumb_opcode(pbCode);
if ((Opcode & 0xfbf08f00) == 0xf2400c00) { // movw r12,#xxxx
ULONG Opcode2 = fetch_thumb_opcode(pbCode+4);
if ((Opcode2 & 0xfbf08f00) == 0xf2c00c00) { // movt r12,#xxxx
ULONG Opcode3 = fetch_thumb_opcode(pbCode+8);
if (Opcode3 == 0xf8dcf000) { // ldr pc,[r12]
PBYTE pbTarget = (PBYTE)(((Opcode2 << 12) & 0xf7000000) |
((Opcode2 << 1) & 0x08000000) |
((Opcode2 << 16) & 0x00ff0000) |
((Opcode >> 4) & 0x0000f700) |
((Opcode >> 15) & 0x00000800) |
((Opcode >> 0) & 0x000000ff));
if (detour_is_imported(pbCode, pbTarget)) {
PBYTE pbNew = *(PBYTE *)pbTarget;
pbNew = DETOURS_PFUNC_TO_PBYTE(pbNew);
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
return pbNew;
}
}
}
}
return pbCode;
}
inline void detour_find_jmp_bounds(PBYTE pbCode,
PDETOUR_TRAMPOLINE *ppLower,
PDETOUR_TRAMPOLINE *ppUpper)
{
// We have to place trampolines within +/- 2GB of code.
ULONG_PTR lo = detour_2gb_below((ULONG_PTR)pbCode);
ULONG_PTR hi = detour_2gb_above((ULONG_PTR)pbCode);
DETOUR_TRACE(("[%p..%p..%p]\n", lo, pbCode, hi));
*ppLower = (PDETOUR_TRAMPOLINE)lo;
*ppUpper = (PDETOUR_TRAMPOLINE)hi;
}
inline BOOL detour_does_code_end_function(PBYTE pbCode)
{
ULONG Opcode = fetch_thumb_opcode(pbCode);
if ((Opcode & 0xffffff87) == 0x4700 || // bx <reg>
(Opcode & 0xf800d000) == 0xf0009000) { // b <imm20>
return TRUE;
}
if ((Opcode & 0xffff8000) == 0xe8bd8000) { // pop {...,pc}
__debugbreak();
return TRUE;
}
if ((Opcode & 0xffffff00) == 0x0000bd00) { // pop {...,pc}
__debugbreak();
return TRUE;
}
return FALSE;
}
inline ULONG detour_is_code_filler(PBYTE pbCode)
{
if (pbCode[0] == 0x00 && pbCode[1] == 0xbf) { // nop.
return 2;
}
if (pbCode[0] == 0x00 && pbCode[1] == 0x00) { // zero-filled padding.
return 2;
}
return 0;
}
#endif // DETOURS_ARM
#ifdef DETOURS_ARM64
struct _DETOUR_TRAMPOLINE
{
// An ARM64 instruction is 4 bytes long.
//
// The overwrite is always composed of 3 instructions (12 bytes) which perform an indirect jump
// using _DETOUR_TRAMPOLINE::pbDetour as the address holding the target location.
//
// Copied instructions can expand.
//
// The scheme using MovImmediate can cause an instruction
// to grow as much as 6 times.
// That would be Bcc or Tbz with a large address space:
// 4 instructions to form immediate
// inverted tbz/bcc
// br
//
// An expansion of 4 is not uncommon -- bl/blr and small address space:
// 3 instructions to form immediate
// br or brl
//
// A theoretical maximum for rbCode is thefore 4*4*6 + 16 = 112 (another 16 for jmp to pbRemain).
//
// With literals, the maximum expansion is 5, including the literals: 4*4*5 + 16 = 96.
//
// The number is rounded up to 128. m_rbScratchDst should match this.
//
BYTE rbCode[128]; // target code + jmp to pbRemain
BYTE cbCode; // size of moved target code.
BYTE cbCodeBreak[3]; // padding to make debugging easier.
BYTE rbRestore[24]; // original target code.
BYTE cbRestore; // size of original target code.
BYTE cbRestoreBreak[3]; // padding to make debugging easier.
_DETOUR_ALIGN rAlign[8]; // instruction alignment array.
PBYTE pbRemain; // first instruction after moved code. [free list]
PBYTE pbDetour; // first instruction of detour function.
};
C_ASSERT(sizeof(_DETOUR_TRAMPOLINE) == 184);
enum {
SIZE_OF_JMP = 12
};
inline ULONG fetch_opcode(PBYTE pbCode)
{
return *(ULONG *)pbCode;
}
inline void write_opcode(PBYTE &pbCode, ULONG Opcode)
{
*(ULONG *)pbCode = Opcode;
pbCode += 4;
}
struct ARM64_INDIRECT_JMP {
struct {
ULONG Rd : 5;
ULONG immhi : 19;
ULONG iop : 5;
ULONG immlo : 2;
ULONG op : 1;
} ardp;
struct {
ULONG Rt : 5;
ULONG Rn : 5;
ULONG imm : 12;
ULONG opc : 2;
ULONG iop1 : 2;
ULONG V : 1;
ULONG iop2 : 3;
ULONG size : 2;
} ldr;
ULONG br;
};
#pragma warning(push)
#pragma warning(disable:4201)
union ARM64_INDIRECT_IMM {
struct {
ULONG64 pad : 12;
ULONG64 adrp_immlo : 2;
ULONG64 adrp_immhi : 19;
};
LONG64 value;
};
#pragma warning(pop)
PBYTE detour_gen_jmp_indirect(BYTE *pbCode, ULONG64 *pbJmpVal)
{
// adrp x17, [jmpval]
// ldr x17, [x17, jmpval]
// br x17
struct ARM64_INDIRECT_JMP *pIndJmp;
union ARM64_INDIRECT_IMM jmpIndAddr;
jmpIndAddr.value = (((LONG64)pbJmpVal) & 0xFFFFFFFFFFFFF000) -
(((LONG64)pbCode) & 0xFFFFFFFFFFFFF000);
pIndJmp = (struct ARM64_INDIRECT_JMP *)pbCode;
pbCode = (BYTE *)(pIndJmp + 1);
pIndJmp->ardp.Rd = 17;
pIndJmp->ardp.immhi = jmpIndAddr.adrp_immhi;
pIndJmp->ardp.iop = 0x10;
pIndJmp->ardp.immlo = jmpIndAddr.adrp_immlo;
pIndJmp->ardp.op = 1;
pIndJmp->ldr.Rt = 17;
pIndJmp->ldr.Rn = 17;
pIndJmp->ldr.imm = (((ULONG64)pbJmpVal) & 0xFFF) / 8;
pIndJmp->ldr.opc = 1;
pIndJmp->ldr.iop1 = 1;
pIndJmp->ldr.V = 0;
pIndJmp->ldr.iop2 = 7;
pIndJmp->ldr.size = 3;
pIndJmp->br = 0xD61F0220;
return pbCode;
}
PBYTE detour_gen_jmp_immediate(PBYTE pbCode, PBYTE *ppPool, PBYTE pbJmpVal)
{
PBYTE pbLiteral;
if (ppPool != NULL) {
*ppPool = *ppPool - 8;
pbLiteral = *ppPool;
}
else {
pbLiteral = pbCode + 8;
}
*((PBYTE*&)pbLiteral) = pbJmpVal;
LONG delta = (LONG)(pbLiteral - pbCode);