/* $Id: PATMR3Dbg.cpp 62478 2016-07-22 18:29:06Z vboxsync $ */ /** @file * PATM - Dynamic Guest OS Patching Manager, Debugger Related Parts. */ /* * Copyright (C) 2006-2016 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 #include #include #include "PATMInternal.h" #include "PATMA.h" #include #include #include #include #include #include /********************************************************************************************************************************* * 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); } } static size_t patmR3DbgDescribePatchAsSymbol(PPATMPATCHREC pPatchRec, char *pszName, size_t cbLeft) { char * const pszNameStart = pszName; #define ADD_SZ(a_sz) \ do { \ if (cbLeft >= sizeof(a_sz)) \ { \ memcpy(pszName, a_sz, sizeof(a_sz)); \ pszName += sizeof(a_sz) - 1; \ cbLeft -= sizeof(a_sz) - 1;\ }\ } while (0) /* Start the name off with the address of the guest code. */ size_t cch = RTStrPrintf(pszName, cbLeft, "Patch_%#08x", pPatchRec->patch.pPrivInstrGC); cbLeft -= cch; pszName += 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("_IdtHnd"); if (fFlags & PATMFL_TRAPHANDLER) ADD_SZ("_TrapHnd"); 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("_TrapHndErrCd"); if (fFlags & PATMFL_MMIO_ACCESS) ADD_SZ("_MmioAccess"); if (fFlags & PATMFL_SYSENTER_XP) ADD_SZ("_SysEnterXP"); if (fFlags & PATMFL_INT3_REPLACEMENT) ADD_SZ("_Int3Repl"); if (fFlags & PATMFL_SUPPORT_CALLS) ADD_SZ("_SupCalls"); if (fFlags & PATMFL_SUPPORT_INDIRECT_CALLS) ADD_SZ("_SupIndirCalls"); 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("_Int3ReplBlock"); if (fFlags & PATMFL_EXTERNAL_JUMP_INSIDE) ADD_SZ("_ExtJmp"); if (fFlags & PATMFL_CODE_REFERENCED) ADD_SZ("_CodeRefed"); return pszName - pszNameStart; } /** * 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). */ char szName[256]; size_t off = patmR3DbgDescribePatchAsSymbol(pPatchRec, szName, sizeof(szName)); /* If we have a symbol near the guest address, append that. */ if (off + 8 <= sizeof(szName)) { RTDBGSYMBOL Symbol; RTGCINTPTR offDisp; DBGFADDRESS Addr; int rc = DBGFR3AsSymbolByAddr(pVM->pUVM, DBGF_AS_GLOBAL, DBGFR3AddrFromFlat(pVM->pUVM, &Addr, pPatchRec->patch.pPrivInstrGC), RTDBGSYMADDR_FLAGS_LESS_OR_EQUAL, &offDisp, &Symbol, NULL /*phMod*/); if (RT_SUCCESS(rc)) { szName[off++] = '_'; szName[off++] = '_'; RTStrCopy(&szName[off], sizeof(szName) - off, 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 and a start marker. */ ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperCallGC, g_patmLookupAndCallRecord.cbFunction, "PATMLookupAndCall"); ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperRetGC, g_patmRetFunctionRecord.cbFunction, "PATMRetFunction"); ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperJumpGC, g_patmLookupAndJumpRecord.cbFunction, "PATMLookupAndJump"); ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pfnHelperIretGC, g_patmIretFunctionRecord.cbFunction, "PATMIretFunction"); ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pPatchMemGC, 0, "PatchMemStart"); ADD_FUNC(hDbgMod, pVM->patm.s.pPatchMemGC, pVM->patm.s.pGCStackGC, PATM_STACK_TOTAL_SIZE, "PATMStack"); /* * 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 something for the stats so we get some kind of symbols for * references to them while disassembling patches. */ rc = RTDbgModCreate(&hDbgMod, "patmstats", PATM_STAT_MEMSIZE, 0 /*fFlags*/); if (RT_SUCCESS(rc)) { ADD_FUNC(hDbgMod, pVM->patm.s.pStatsGC, pVM->patm.s.pStatsGC, PATM_STAT_MEMSIZE, "PATMMemStatsStart"); rc = RTDbgAsModuleLink(hDbgAs, hDbgMod, pVM->patm.s.pStatsGC, 0 /*fFlags*/); AssertLogRelRC(rc); RTDbgModRelease(hDbgMod); } /* * Add a fake debug module for the patches and stack. */ rc = RTDbgModCreate(&hDbgMod, "patches", pVM->patm.s.cbPatchMem + PATM_STACK_TOTAL_SIZE + PAGE_SIZE, 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); } } /** * Annotates an instruction if patched. * * @param pVM The cross context VM structure. * @param RCPtr The instruction address. * @param cbInstr The instruction length. * @param pszBuf The output buffer. This will be an empty string if the * instruction wasn't patched. If it's patched, it will * hold a symbol-like string describing the patch. * @param cbBuf The size of the output buffer. */ VMMR3_INT_DECL(void) PATMR3DbgAnnotatePatchedInstruction(PVM pVM, RTRCPTR RCPtr, uint8_t cbInstr, char *pszBuf, size_t cbBuf) { /* * Always zero the buffer. */ AssertReturnVoid(cbBuf > 0); *pszBuf = '\0'; /* * Drop out immediately if it cannot be a patched instruction. */ if (!PATMIsEnabled(pVM)) return; if ( RCPtr < pVM->patm.s.pPatchedInstrGCLowest || RCPtr > pVM->patm.s.pPatchedInstrGCHighest) return; /* * Look for a patch record covering any part of the instruction. * * The first query results in a patched less or equal to RCPtr. While the * second results in one that's greater than RCPtr. */ PPATMPATCHREC pPatchRec; pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, RCPtr, false /*fFromAbove*/); if ( !pPatchRec || RCPtr - pPatchRec->patch.pPrivInstrGC > pPatchRec->patch.cbPrivInstr) { pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, RCPtr, true /*fFromAbove*/); if ( !pPatchRec || (RTRCPTR)(RCPtr + cbInstr) < pPatchRec->patch.pPrivInstrGC ) return; } /* * Lazy bird uses the symbol name generation code for describing the patch. */ size_t off = patmR3DbgDescribePatchAsSymbol(pPatchRec, pszBuf, cbBuf); if (off + 1 < cbBuf) { const char *pszState; switch (pPatchRec->patch.uState) { case PATCH_REFUSED: pszState = "Refused"; break; case PATCH_DISABLED: pszState = "Disabled"; break; case PATCH_ENABLED: pszState = "Enabled"; break; case PATCH_UNUSABLE: pszState = "Unusable"; break; case PATCH_DIRTY: pszState = "Dirty"; break; case PATCH_DISABLE_PENDING: pszState = "DisablePending"; break; default: pszState = "State???"; AssertFailed(); break; } if (pPatchRec->patch.cbPatchBlockSize > 0) off += RTStrPrintf(&pszBuf[off], cbBuf - off, " - %s (%u b) - %#x LB %#x", pszState, pPatchRec->patch.cbPatchJump, pPatchRec->patch.pPatchBlockOffset + pVM->patm.s.pPatchMemGC, pPatchRec->patch.cbPatchBlockSize); else off += RTStrPrintf(&pszBuf[off], cbBuf - off, " - %s (%u b)", pszState, pPatchRec->patch.cbPatchJump); } }