PATMR3Dbg.cpp revision acb0ddeac7f624f263afe1c42c8e35655aa59181
/* $Id$ */
/** @file
* PATM - Dynamic Guest OS Patching Manager, Debugger Related Parts.
*/
/*
* Copyright (C) 2006-2013 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP LOG_GROUP_PATM
#include <VBox/vmm/patm.h>
#include <VBox/vmm/dbgf.h>
#include <VBox/vmm/hm.h>
#include "PATMInternal.h"
#include "PATMA.h"
#include <VBox/vmm/vm.h>
#include <VBox/err.h>
#include <VBox/log.h>
#include <iprt/assert.h>
#include <iprt/dbg.h>
#include <iprt/string.h>
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
/** Adds a structure member to a debug (pseudo) module as a symbol. */
#define ADD_MEMBER(a_hDbgMod, a_Struct, a_Member, a_pszName) \
do { \
rc = RTDbgModSymbolAdd(hDbgMod, a_pszName, 0 /*iSeg*/, RT_OFFSETOF(a_Struct, a_Member), \
RT_SIZEOFMEMB(a_Struct, a_Member), 0 /*fFlags*/, NULL /*piOrdinal*/); \
AssertRC(rc); \
} while (0)
/** Adds a structure member to a debug (pseudo) module as a symbol. */
#define ADD_FUNC(a_hDbgMod, a_BaseRCPtr, a_FuncRCPtr, a_cbFunc, a_pszName) \
do { \
int rcAddFunc = RTDbgModSymbolAdd(hDbgMod, a_pszName, 0 /*iSeg*/, \
(RTRCUINTPTR)a_FuncRCPtr - (RTRCUINTPTR)(a_BaseRCPtr), \
a_cbFunc, 0 /*fFlags*/, NULL /*piOrdinal*/); \
AssertRC(rcAddFunc); \
} while (0)
/**
* Called by PATMR3Init.
*
* @param pVM The cross context VM structure.
*/
void patmR3DbgInit(PVM pVM)
{
pVM->patm.s.hDbgModPatchMem = NIL_RTDBGMOD;
}
/**
* Called by PATMR3Term.
*
* @param pVM The cross context VM structure.
*/
void patmR3DbgTerm(PVM pVM)
{
if (pVM->patm.s.hDbgModPatchMem != NIL_RTDBGMOD)
{
RTDbgModRelease(pVM->patm.s.hDbgModPatchMem);
pVM->patm.s.hDbgModPatchMem = NIL_RTDBGMOD;
}
}
/**
* Called by when the patch memory is reinitialized.
*
* @param pVM The cross context VM structure.
*/
void patmR3DbgReset(PVM pVM)
{
if (pVM->patm.s.hDbgModPatchMem != NIL_RTDBGMOD)
{
RTDbgModRemoveAll(pVM->patm.s.hDbgModPatchMem, true);
}
}
/**
* Called when a new patch is added or when first populating the address space.
*
* @param pVM The cross context VM structure.
* @param pPatchRec The patch record.
*/
void patmR3DbgAddPatch(PVM pVM, PPATMPATCHREC pPatchRec)
{
if ( pVM->patm.s.hDbgModPatchMem != NIL_RTDBGMOD
&& pPatchRec->patch.pPatchBlockOffset > 0
&& !(pPatchRec->patch.flags & PATMFL_GLOBAL_FUNCTIONS))
{
/** @todo find a cheap way of checking whether we've already added the patch.
* Using a flag would be nice, except I don't want to consider saved
* state considerations right now (I don't recall if we're still
* depending on structure layout there or not). */
int rc;
char szName[256];
#define ADD_SZ(a_sz) \
do { \
if (cbLeft >= sizeof(a_sz)) \
{ \
memcpy(pszName, a_sz, sizeof(a_sz)); \
pszName += sizeof(a_sz); \
cbLeft -= sizeof(a_sz);\
}\
} while (0)
/* Start the name off with the address of the guest code. */
size_t cch = RTStrPrintf(szName, sizeof(szName), "Patch_%#08x", pPatchRec->patch.pPrivInstrGC);
char *pszName = &szName[cch];
size_t cbLeft = sizeof(szName) - cch;
/* Append flags. */
uint64_t fFlags = pPatchRec->patch.flags;
if (fFlags & PATMFL_INTHANDLER)
ADD_SZ("_IntHandler");
if (fFlags & PATMFL_SYSENTER)
ADD_SZ("_SysEnter");
if (fFlags & PATMFL_GUEST_SPECIFIC)
ADD_SZ("_GuestSpecific");
if (fFlags & PATMFL_USER_MODE)
ADD_SZ("_UserMode");
if (fFlags & PATMFL_IDTHANDLER)
ADD_SZ("_IdtHandler");
if (fFlags & PATMFL_TRAPHANDLER)
ADD_SZ("_TrapHandler");
if (fFlags & PATMFL_DUPLICATE_FUNCTION)
ADD_SZ("_DupFunc");
if (fFlags & PATMFL_REPLACE_FUNCTION_CALL)
ADD_SZ("_ReplFunc");
if (fFlags & PATMFL_TRAPHANDLER_WITH_ERRORCODE)
ADD_SZ("_TrapHandlerErrCd");
if (fFlags & PATMFL_MMIO_ACCESS)
ADD_SZ("_MmioAccess");
if (fFlags & PATMFL_SYSENTER_XP)
ADD_SZ("_SysEnterXP");
if (fFlags & PATMFL_INT3_REPLACEMENT)
ADD_SZ("_Int3Replacement");
if (fFlags & PATMFL_SUPPORT_CALLS)
ADD_SZ("_SupportCalls");
if (fFlags & PATMFL_SUPPORT_INDIRECT_CALLS)
ADD_SZ("_SupportIndirectCalls");
if (fFlags & PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT)
ADD_SZ("_IdtHandlerWE");
if (fFlags & PATMFL_INHIBIT_IRQS)
ADD_SZ("_InhibitIrqs");
if (fFlags & PATMFL_RECOMPILE_NEXT)
ADD_SZ("_RecompileNext");
if (fFlags & PATMFL_CALLABLE_AS_FUNCTION)
ADD_SZ("_Callable");
if (fFlags & PATMFL_TRAMPOLINE)
ADD_SZ("_Trampoline");
if (fFlags & PATMFL_PATCHED_GUEST_CODE)
ADD_SZ("_PatchedGuestCode");
if (fFlags & PATMFL_MUST_INSTALL_PATCHJMP)
ADD_SZ("_MustInstallPatchJmp");
if (fFlags & PATMFL_INT3_REPLACEMENT_BLOCK)
ADD_SZ("_Int3ReplacementBlock");
if (fFlags & PATMFL_EXTERNAL_JUMP_INSIDE)
ADD_SZ("_ExtJmp");
if (fFlags & PATMFL_CODE_REFERENCED)
ADD_SZ("_CodeRefed");
/* If we have a symbol near the guest address, append that. */
if (cbLeft > 8)
{
DBGFSYMBOL Symbol;
RTGCINTPTR offDisp;
rc = DBGFR3SymbolByAddr(pVM, pPatchRec->patch.pPrivInstrGC, &offDisp, &Symbol);
if (RT_SUCCESS(rc))
{
ADD_SZ("__");
RTStrCopy(pszName, cbLeft, Symbol.szName);
}
}
/* Add it (may fail due to enable/disable patches). */
RTDbgModSymbolAdd(pVM->patm.s.hDbgModPatchMem, szName, 0 /*iSeg*/,
pPatchRec->patch.pPatchBlockOffset,
pPatchRec->patch.cbPatchBlockSize,
0 /*fFlags*/, NULL /*piOrdinal*/);
}
}
/**
* Enumeration callback used by patmR3DbgAddPatches
*
* @returns 0 (continue enum)
* @param pNode The patch record node.
* @param pvUser The cross context VM structure.
*/
static DECLCALLBACK(int) patmR3DbgAddPatchCallback(PAVLOU32NODECORE pNode, void *pvUser)
{
patmR3DbgAddPatch((PVM)pvUser, (PPATMPATCHREC)pNode);
return 0;
}
/**
* Populates an empty "patches" (hDbgModPatchMem) module with patch symbols.
*
* @param pVM The cross context VM structure.
* @param hDbgMod The debug module handle.
*/
static void patmR3DbgAddPatches(PVM pVM, RTDBGMOD hDbgMod)
{
/*
* Global functions.
*/
ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperCallGC, PATMLookupAndCallRecord.size, "PATMLookupAndCall");
ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperRetGC, PATMRetFunctionRecord.size, "PATMRetFunction");
ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperJumpGC, PATMLookupAndJumpRecord.size, "PATMLookupAndJump");
ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperIretGC, PATMIretFunctionRecord.size, "PATMIretFunction");
/*
* The patches.
*/
RTAvloU32DoWithAll(&pVM->patm.s.PatchLookupTreeHC->PatchTree, true /*fFromLeft*/, patmR3DbgAddPatchCallback, pVM);
}
/**
* Populate DBGF_AS_RC with PATM symbols.
*
* Called by dbgfR3AsLazyPopulate when DBGF_AS_RC or DBGF_AS_RC_AND_GC_GLOBAL is
* accessed for the first time.
*
* @param pVM The cross context VM structure.
* @param hDbgAs The DBGF_AS_RC address space handle.
*/
VMMR3_INT_DECL(void) PATMR3DbgPopulateAddrSpace(PVM pVM, RTDBGAS hDbgAs)
{
AssertReturnVoid(!HMIsEnabled(pVM));
/*
* Add a fake debug module for the PATMGCSTATE structure.
*/
RTDBGMOD hDbgMod;
int rc = RTDbgModCreate(&hDbgMod, "patmgcstate", sizeof(PATMGCSTATE), 0 /*fFlags*/);
if (RT_SUCCESS(rc))
{
ADD_MEMBER(hDbgMod, PATMGCSTATE, uVMFlags, "uVMFlags");
ADD_MEMBER(hDbgMod, PATMGCSTATE, uPendingAction, "uPendingAction");
ADD_MEMBER(hDbgMod, PATMGCSTATE, uPatchCalls, "uPatchCalls");
ADD_MEMBER(hDbgMod, PATMGCSTATE, uScratch, "uScratch");
ADD_MEMBER(hDbgMod, PATMGCSTATE, uIretEFlags, "uIretEFlags");
ADD_MEMBER(hDbgMod, PATMGCSTATE, uIretCS, "uIretCS");
ADD_MEMBER(hDbgMod, PATMGCSTATE, uIretEIP, "uIretEIP");
ADD_MEMBER(hDbgMod, PATMGCSTATE, Psp, "Psp");
ADD_MEMBER(hDbgMod, PATMGCSTATE, fPIF, "fPIF");
ADD_MEMBER(hDbgMod, PATMGCSTATE, GCPtrInhibitInterrupts, "GCPtrInhibitInterrupts");
ADD_MEMBER(hDbgMod, PATMGCSTATE, GCCallPatchTargetAddr, "GCCallPatchTargetAddr");
ADD_MEMBER(hDbgMod, PATMGCSTATE, GCCallReturnAddr, "GCCallReturnAddr");
ADD_MEMBER(hDbgMod, PATMGCSTATE, Restore.uEAX, "Restore.uEAX");
ADD_MEMBER(hDbgMod, PATMGCSTATE, Restore.uECX, "Restore.uECX");
ADD_MEMBER(hDbgMod, PATMGCSTATE, Restore.uEDI, "Restore.uEDI");
ADD_MEMBER(hDbgMod, PATMGCSTATE, Restore.eFlags, "Restore.eFlags");
ADD_MEMBER(hDbgMod, PATMGCSTATE, Restore.uFlags, "Restore.uFlags");
rc = RTDbgAsModuleLink(hDbgAs, hDbgMod, pVM->patm.s.pGCStateGC, 0 /*fFlags/*/);
AssertLogRelRC(rc);
RTDbgModRelease(hDbgMod);
}
/*
* Add a fake debug module for the patches.
*/
rc = RTDbgModCreate(&hDbgMod, "patches", pVM->patm.s.cbPatchMem, 0 /*fFlags*/);
if (RT_SUCCESS(rc))
{
pVM->patm.s.hDbgModPatchMem = hDbgMod;
patmR3DbgAddPatches(pVM, hDbgMod);
rc = RTDbgAsModuleLink(hDbgAs, hDbgMod, pVM->patm.s.pPatchMemGC, 0 /*fFlags/*/);
AssertLogRelRC(rc);
}
}