/* $Id: SUPDrv-dtrace.cpp 62490 2016-07-22 18:41:49Z vboxsync $ */ /** @file * VBoxDrv - The VirtualBox Support Driver - DTrace Provider. */ /* * Copyright (C) 2012-2016 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. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_SUP_DRV #include "SUPDrvInternal.h" #include #include #include #include #include #include #include #ifdef RT_OS_DARWIN # include #endif #ifdef RT_OS_DARWIN # include VBOX_PATH_MACOSX_DTRACE_H #elif defined(RT_OS_LINUX) /* Avoid type and define conflicts. */ # undef UINT8_MAX # undef UINT16_MAX # undef UINT32_MAX # undef UINT64_MAX # undef INT64_MAX # undef INT64_MIN # define intptr_t dtrace_intptr_t # if 0 /* DTrace experiments with the Unbreakable Enterprise Kernel (UEK2) (Oracle Linux). 1. The dtrace.h here is from the dtrace module source, not /usr/include/sys/dtrace.h nor /usr/include/dtrace.h. 2. To generate the missing entries for the dtrace module in Module.symvers of UEK: nm /lib/modules/....../kernel/drivers/dtrace/dtrace.ko \ | grep _crc_ \ | sed -e 's/^......../0x/' -e 's/ A __crc_/\t/' \ -e 's/$/\tdrivers\/dtrace\/dtrace\tEXPORT_SYMBOL/' \ >> Module.symvers Update: Althernative workaround (active), resolve symbols dynamically. 3. No tracepoints in vboxdrv, vboxnet* or vboxpci yet. This requires yasm and VBoxTpG and build time. */ # include "dtrace.h" # else /* DTrace experiments with the Unbreakable Enterprise Kernel (UEKR3) (Oracle Linux). 1. To generate the missing entries for the dtrace module in Module.symvers of UEK: nm /lib/modules/....../kernel/drivers/dtrace/dtrace.ko \ | grep _crc_ \ | sed -e 's/^......../0x/' -e 's/ A __crc_/\t/' \ -e 's/$/\tdrivers\/dtrace\/dtrace\tEXPORT_SYMBOL/' \ >> Module.symvers Update: Althernative workaround (active), resolve symbols dynamically. 2. No tracepoints in vboxdrv, vboxnet* or vboxpci yet. This requires yasm and VBoxTpG and build time. */ # include # include /* Missing from provider.h. */ # include /* Missing from provider.h. */ # endif # include /** Status code fixer (UEK uses linux convension unlike the others). */ # define FIX_UEK_RC(a_rc) (-(a_rc)) #else # include #endif /** * The UEK DTrace port is trying to be smart and seems to have turned all * errno return codes negative. While this conforms to the linux kernel way of * doing things, it breaks with the way the interfaces work on Solaris and * Mac OS X. */ #ifndef FIX_UEK_RC # define FIX_UEK_RC(a_rc) (a_rc) #endif /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /* Seems there is some return code difference here. Keep the return code and case it to whatever the host desires. */ #ifdef RT_OS_DARWIN # if MAC_OS_X_VERSION_MIN_REQUIRED < 1070 typedef void FNPOPS_ENABLE(void *, dtrace_id_t, void *); # else typedef int FNPOPS_ENABLE(void *, dtrace_id_t, void *); # endif #else typedef int FNPOPS_ENABLE(void *, dtrace_id_t, void *); #endif /** Caller indicator. */ typedef enum VBOXDTCALLER { kVBoxDtCaller_Invalid = 0, kVBoxDtCaller_Generic, kVBoxDtCaller_ProbeFireUser, kVBoxDtCaller_ProbeFireKernel } VBOXDTCALLER; /** * Stack data planted before calling dtrace_probe so that we can easily find the * stack argument later. */ typedef struct VBDTSTACKDATA { /** Eyecatcher no. 1 (SUPDRVDT_STACK_DATA_MAGIC2). */ uint32_t u32Magic1; /** Eyecatcher no. 2 (SUPDRVDT_STACK_DATA_MAGIC2). */ uint32_t u32Magic2; /** The format of the caller specific data. */ VBOXDTCALLER enmCaller; /** Caller specific data. */ union { /** kVBoxDtCaller_ProbeFireKernel. */ struct { /** Pointer to the stack arguments of a probe function call. */ uintptr_t *pauStackArgs; } ProbeFireKernel; /** kVBoxDtCaller_ProbeFireUser. */ struct { /** The user context. */ PCSUPDRVTRACERUSRCTX pCtx; /** The argument displacement caused by 64-bit arguments passed directly to * dtrace_probe. */ int offArg; } ProbeFireUser; } u; /** Pointer to this structure. * This is the final bit of integrity checking. */ struct VBDTSTACKDATA *pSelf; } VBDTSTACKDATA; /** Pointer to the on-stack thread specific data. */ typedef VBDTSTACKDATA *PVBDTSTACKDATA; /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ /** The first magic value. */ #define SUPDRVDT_STACK_DATA_MAGIC1 RT_MAKE_U32_FROM_U8('S', 'U', 'P', 'D') /** The second magic value. */ #define SUPDRVDT_STACK_DATA_MAGIC2 RT_MAKE_U32_FROM_U8('D', 'T', 'r', 'c') /** The alignment of the stack data. * The data doesn't require more than sizeof(uintptr_t) alignment, but the * greater alignment the quicker lookup. */ #define SUPDRVDT_STACK_DATA_ALIGN 32 /** Plants the stack data. */ #define VBDT_SETUP_STACK_DATA(a_enmCaller) \ uint8_t abBlob[sizeof(VBDTSTACKDATA) + SUPDRVDT_STACK_DATA_ALIGN - 1]; \ PVBDTSTACKDATA pStackData = (PVBDTSTACKDATA)( (uintptr_t)&abBlob[SUPDRVDT_STACK_DATA_ALIGN - 1] \ & ~(uintptr_t)(SUPDRVDT_STACK_DATA_ALIGN - 1)); \ pStackData->u32Magic1 = SUPDRVDT_STACK_DATA_MAGIC1; \ pStackData->u32Magic2 = SUPDRVDT_STACK_DATA_MAGIC2; \ pStackData->enmCaller = a_enmCaller; \ pStackData->pSelf = pStackData /** Passifies the stack data and frees up resource held within it. */ #define VBDT_CLEAR_STACK_DATA() \ do \ { \ pStackData->u32Magic1 = 0; \ pStackData->u32Magic2 = 0; \ pStackData->pSelf = NULL; \ } while (0) /** Simple SUPR0Printf-style logging. */ #if 0 /*def DEBUG_bird*/ # define LOG_DTRACE(a) SUPR0Printf a #else # define LOG_DTRACE(a) do { } while (0) #endif /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ #if defined(RT_OS_DARWIN) || defined(RT_OS_LINUX) /** @name DTrace kernel interface used on Darwin and Linux. * @{ */ static void (* g_pfnDTraceProbeFire)(dtrace_id_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t); static dtrace_id_t (* g_pfnDTraceProbeCreate)(dtrace_provider_id_t, const char *, const char *, const char *, int, void *); static dtrace_id_t (* g_pfnDTraceProbeLookup)(dtrace_provider_id_t, const char *, const char *, const char *); static int (* g_pfnDTraceProviderRegister)(const char *, const dtrace_pattr_t *, uint32_t, /*cred_t*/ void *, const dtrace_pops_t *, void *, dtrace_provider_id_t *); static void (* g_pfnDTraceProviderInvalidate)(dtrace_provider_id_t); static int (* g_pfnDTraceProviderUnregister)(dtrace_provider_id_t); #define dtrace_probe g_pfnDTraceProbeFire #define dtrace_probe_create g_pfnDTraceProbeCreate #define dtrace_probe_lookup g_pfnDTraceProbeLookup #define dtrace_register g_pfnDTraceProviderRegister #define dtrace_invalidate g_pfnDTraceProviderInvalidate #define dtrace_unregister g_pfnDTraceProviderUnregister /** @} */ #endif /** * Gets the stack data. * * @returns Pointer to the stack data. Never NULL. */ static PVBDTSTACKDATA vboxDtGetStackData(void) { /* * Locate the caller of probe_dtrace. */ int volatile iDummy = 1; /* use this to get the stack address. */ PVBDTSTACKDATA pData = (PVBDTSTACKDATA)( ((uintptr_t)&iDummy + SUPDRVDT_STACK_DATA_ALIGN - 1) & ~(uintptr_t)(SUPDRVDT_STACK_DATA_ALIGN - 1)); for (;;) { if ( pData->u32Magic1 == SUPDRVDT_STACK_DATA_MAGIC1 && pData->u32Magic2 == SUPDRVDT_STACK_DATA_MAGIC2 && pData->pSelf == pData) return pData; pData = (PVBDTSTACKDATA)((uintptr_t)pData + SUPDRVDT_STACK_DATA_ALIGN); } } /* * * Helpers for handling VTG structures. * Helpers for handling VTG structures. * Helpers for handling VTG structures. * */ /** * Converts an attribute from VTG description speak to DTrace. * * @param pDtAttr The DTrace attribute (dst). * @param pVtgAttr The VTG attribute descriptor (src). */ static void vboxDtVtgConvAttr(dtrace_attribute_t *pDtAttr, PCVTGDESCATTR pVtgAttr) { pDtAttr->dtat_name = pVtgAttr->u8Code - 1; pDtAttr->dtat_data = pVtgAttr->u8Data - 1; pDtAttr->dtat_class = pVtgAttr->u8DataDep - 1; } /** * Gets a string from the string table. * * @returns Pointer to the string. * @param pVtgHdr The VTG object header. * @param offStrTab The string table offset. */ static const char *vboxDtVtgGetString(PVTGOBJHDR pVtgHdr, uint32_t offStrTab) { Assert(offStrTab < pVtgHdr->cbStrTab); return (const char *)pVtgHdr + pVtgHdr->offStrTab + offStrTab; } /* * * DTrace Provider Interface. * DTrace Provider Interface. * DTrace Provider Interface. * */ /** * @callback_method_impl{dtrace_pops_t,dtps_provide} */ static void vboxDtPOps_Provide(void *pvProv, const dtrace_probedesc_t *pDtProbeDesc) { PSUPDRVVDTPROVIDERCORE pProv = (PSUPDRVVDTPROVIDERCORE)pvProv; AssertPtrReturnVoid(pProv); LOG_DTRACE(("%s: %p / %p pDtProbeDesc=%p\n", __FUNCTION__, pProv, pProv->TracerData.DTrace.idProvider, pDtProbeDesc)); if (pDtProbeDesc) return; /* We don't generate probes, so never mind these requests. */ if (pProv->TracerData.DTrace.fZombie) return; dtrace_provider_id_t const idProvider = pProv->TracerData.DTrace.idProvider; AssertPtrReturnVoid(idProvider); AssertPtrReturnVoid(pProv->pHdr); AssertReturnVoid(pProv->pHdr->offProbeLocs != 0); uint32_t const cProbeLocs = pProv->pHdr->cbProbeLocs / sizeof(VTGPROBELOC); /* Need a buffer for extracting the function names and mangling them in case of collision. */ size_t const cbFnNmBuf = _4K + _1K; char *pszFnNmBuf = (char *)RTMemAlloc(cbFnNmBuf); if (!pszFnNmBuf) return; /* * Itereate the probe location list and register all probes related to * this provider. */ uint16_t const idxProv = (uint16_t)((PVTGDESCPROVIDER)((uintptr_t)pProv->pHdr + pProv->pHdr->offProviders) - pProv->pDesc); uint32_t idxProbeLoc; for (idxProbeLoc = 0; idxProbeLoc < cProbeLocs; idxProbeLoc++) { /* Skip probe location belonging to other providers or once that we've already reported. */ PCVTGPROBELOC pProbeLocRO = &pProv->paProbeLocsRO[idxProbeLoc]; PVTGDESCPROBE pProbeDesc = pProbeLocRO->pProbe; if (pProbeDesc->idxProvider != idxProv) continue; uint32_t *pidProbe; if (!pProv->fUmod) pidProbe = (uint32_t *)&pProbeLocRO->idProbe; else pidProbe = &pProv->paR0ProbeLocs[idxProbeLoc].idProbe; if (*pidProbe != 0) continue; /* The function name may need to be stripped since we're using C++ compilers for most of the code. ASSUMES nobody are brave/stupid enough to use function pointer returns without typedef'ing properly them (e.g. signal). */ const char *pszPrbName = vboxDtVtgGetString(pProv->pHdr, pProbeDesc->offName); const char *pszFunc = pProbeLocRO->pszFunction; const char *psz = strchr(pProbeLocRO->pszFunction, '('); size_t cch; if (psz) { /* skip blanks preceeding the parameter parenthesis. */ while ( (uintptr_t)psz > (uintptr_t)pProbeLocRO->pszFunction && RT_C_IS_BLANK(psz[-1])) psz--; /* Find the start of the function name. */ pszFunc = psz - 1; while ((uintptr_t)pszFunc > (uintptr_t)pProbeLocRO->pszFunction) { char ch = pszFunc[-1]; if (!RT_C_IS_ALNUM(ch) && ch != '_' && ch != ':') break; pszFunc--; } cch = psz - pszFunc; } else cch = strlen(pszFunc); RTStrCopyEx(pszFnNmBuf, cbFnNmBuf, pszFunc, cch); /* Look up the probe, if we have one in the same function, mangle the function name a little to avoid having to deal with having multiple location entries with the same probe ID. (lazy bird) */ Assert(!*pidProbe); if (dtrace_probe_lookup(idProvider, pProv->pszModName, pszFnNmBuf, pszPrbName) != DTRACE_IDNONE) { RTStrPrintf(pszFnNmBuf+cch, cbFnNmBuf - cch, "-%u", pProbeLocRO->uLine); if (dtrace_probe_lookup(idProvider, pProv->pszModName, pszFnNmBuf, pszPrbName) != DTRACE_IDNONE) { unsigned iOrd = 2; while (iOrd < 128) { RTStrPrintf(pszFnNmBuf+cch, cbFnNmBuf - cch, "-%u-%u", pProbeLocRO->uLine, iOrd); if (dtrace_probe_lookup(idProvider, pProv->pszModName, pszFnNmBuf, pszPrbName) == DTRACE_IDNONE) break; iOrd++; } if (iOrd >= 128) { LogRel(("VBoxDrv: More than 128 duplicate probe location instances %s at line %u in function %s [%s], probe %s\n", pProbeLocRO->uLine, pProbeLocRO->pszFunction, pszFnNmBuf, pszPrbName)); continue; } } } /* Create the probe. */ AssertCompile(sizeof(*pidProbe) == sizeof(dtrace_id_t)); *pidProbe = dtrace_probe_create(idProvider, pProv->pszModName, pszFnNmBuf, pszPrbName, 1 /*aframes*/, (void *)(uintptr_t)idxProbeLoc); pProv->TracerData.DTrace.cProvidedProbes++; } RTMemFree(pszFnNmBuf); LOG_DTRACE(("%s: returns\n", __FUNCTION__)); } /** * @callback_method_impl{dtrace_pops_t,dtps_enable} */ static int vboxDtPOps_Enable(void *pvProv, dtrace_id_t idProbe, void *pvProbe) { PSUPDRVVDTPROVIDERCORE pProv = (PSUPDRVVDTPROVIDERCORE)pvProv; LOG_DTRACE(("%s: %p / %p - %#x / %p\n", __FUNCTION__, pProv, pProv->TracerData.DTrace.idProvider, idProbe, pvProbe)); AssertPtrReturn(pProv->TracerData.DTrace.idProvider, EINVAL); if (!pProv->TracerData.DTrace.fZombie) { uint32_t idxProbeLoc = (uint32_t)(uintptr_t)pvProbe; PVTGPROBELOC32 pProbeLocEn = (PVTGPROBELOC32)( (uintptr_t)pProv->pvProbeLocsEn + idxProbeLoc * pProv->cbProbeLocsEn); PCVTGPROBELOC pProbeLocRO = (PVTGPROBELOC)&pProv->paProbeLocsRO[idxProbeLoc]; PCVTGDESCPROBE pProbeDesc = pProbeLocRO->pProbe; uint32_t const idxProbe = pProbeDesc->idxEnabled; if (!pProv->fUmod) { if (!pProbeLocEn->fEnabled) { pProbeLocEn->fEnabled = 1; ASMAtomicIncU32(&pProv->pacProbeEnabled[idxProbe]); ASMAtomicIncU32(&pProv->pDesc->cProbesEnabled); ASMAtomicIncU32(&pProv->pDesc->uSettingsSerialNo); } } else { /* Update kernel mode structure */ if (!pProv->paR0ProbeLocs[idxProbeLoc].fEnabled) { pProv->paR0ProbeLocs[idxProbeLoc].fEnabled = 1; ASMAtomicIncU32(&pProv->paR0Probes[idxProbe].cEnabled); ASMAtomicIncU32(&pProv->pDesc->cProbesEnabled); ASMAtomicIncU32(&pProv->pDesc->uSettingsSerialNo); } /* Update user mode structure. */ pProbeLocEn->fEnabled = 1; pProv->pacProbeEnabled[idxProbe] = pProv->paR0Probes[idxProbe].cEnabled; } } return 0; } /** * @callback_method_impl{dtrace_pops_t,dtps_disable} */ static void vboxDtPOps_Disable(void *pvProv, dtrace_id_t idProbe, void *pvProbe) { PSUPDRVVDTPROVIDERCORE pProv = (PSUPDRVVDTPROVIDERCORE)pvProv; AssertPtrReturnVoid(pProv); LOG_DTRACE(("%s: %p / %p - %#x / %p\n", __FUNCTION__, pProv, pProv->TracerData.DTrace.idProvider, idProbe, pvProbe)); AssertPtrReturnVoid(pProv->TracerData.DTrace.idProvider); if (!pProv->TracerData.DTrace.fZombie) { uint32_t idxProbeLoc = (uint32_t)(uintptr_t)pvProbe; PVTGPROBELOC32 pProbeLocEn = (PVTGPROBELOC32)( (uintptr_t)pProv->pvProbeLocsEn + idxProbeLoc * pProv->cbProbeLocsEn); PCVTGPROBELOC pProbeLocRO = (PVTGPROBELOC)&pProv->paProbeLocsRO[idxProbeLoc]; PCVTGDESCPROBE pProbeDesc = pProbeLocRO->pProbe; uint32_t const idxProbe = pProbeDesc->idxEnabled; if (!pProv->fUmod) { if (pProbeLocEn->fEnabled) { pProbeLocEn->fEnabled = 0; ASMAtomicDecU32(&pProv->pacProbeEnabled[idxProbe]); ASMAtomicIncU32(&pProv->pDesc->cProbesEnabled); ASMAtomicIncU32(&pProv->pDesc->uSettingsSerialNo); } } else { /* Update kernel mode structure */ if (pProv->paR0ProbeLocs[idxProbeLoc].fEnabled) { pProv->paR0ProbeLocs[idxProbeLoc].fEnabled = 0; ASMAtomicDecU32(&pProv->paR0Probes[idxProbe].cEnabled); ASMAtomicDecU32(&pProv->pDesc->cProbesEnabled); ASMAtomicIncU32(&pProv->pDesc->uSettingsSerialNo); } /* Update user mode structure. */ pProbeLocEn->fEnabled = 0; pProv->pacProbeEnabled[idxProbe] = pProv->paR0Probes[idxProbe].cEnabled; } } } /** * @callback_method_impl{dtrace_pops_t,dtps_getargdesc} */ static void vboxDtPOps_GetArgDesc(void *pvProv, dtrace_id_t idProbe, void *pvProbe, dtrace_argdesc_t *pArgDesc) { PSUPDRVVDTPROVIDERCORE pProv = (PSUPDRVVDTPROVIDERCORE)pvProv; unsigned uArg = pArgDesc->dtargd_ndx; pArgDesc->dtargd_ndx = DTRACE_ARGNONE; AssertPtrReturnVoid(pProv); LOG_DTRACE(("%s: %p / %p - %#x / %p uArg=%d\n", __FUNCTION__, pProv, pProv->TracerData.DTrace.idProvider, idProbe, pvProbe, uArg)); AssertPtrReturnVoid(pProv->TracerData.DTrace.idProvider); if (!pProv->TracerData.DTrace.fZombie) { uint32_t idxProbeLoc = (uint32_t)(uintptr_t)pvProbe; PCVTGPROBELOC pProbeLocRO = (PVTGPROBELOC)&pProv->paProbeLocsRO[idxProbeLoc]; PCVTGDESCPROBE pProbeDesc = pProbeLocRO->pProbe; PCVTGDESCARGLIST pArgList = (PCVTGDESCARGLIST)( (uintptr_t)pProv->pHdr + pProv->pHdr->offArgLists + pProbeDesc->offArgList); AssertReturnVoid(pProbeDesc->offArgList < pProv->pHdr->cbArgLists); if (uArg < pArgList->cArgs) { const char *pszType = vboxDtVtgGetString(pProv->pHdr, pArgList->aArgs[uArg].offType); size_t cchType = strlen(pszType); if (cchType < sizeof(pArgDesc->dtargd_native)) { memcpy(pArgDesc->dtargd_native, pszType, cchType + 1); /** @todo mapping? */ pArgDesc->dtargd_ndx = uArg; LOG_DTRACE(("%s: returns dtargd_native = %s\n", __FUNCTION__, pArgDesc->dtargd_native)); return; } } } } /** * @callback_method_impl{dtrace_pops_t,dtps_getargval} * * * We just cook our own stuff here, using a stack marker for finding the * required information. That's more reliable than subjecting oneself to the * solaris bugs and 32-bit apple peculiarities. * * * @remarks Solaris Bug * * dtrace_getarg on AMD64 has a different opinion about how to use the cFrames * argument than dtrace_caller() and/or dtrace_getpcstack(), at least when the * probe is fired by dtrace_probe() the way we do. * * Setting aframes to 1 when calling dtrace_probe_create gives me the right * arguments, but the wrong 'caller'. Since I cannot do anything about * 'caller', the only solution is this hack. * * Not sure why the Solaris guys hasn't seen this issue before, but maybe there * isn't anyone using the default argument getter path for ring-0 dtrace_probe() * calls, SDT surely isn't. * * @todo File a solaris bug on dtrace_probe() + dtrace_getarg(). * * * @remarks 32-bit XNU (Apple) * * The dtrace_probe arguments are 64-bit unsigned integers instead of uintptr_t, * so we need to make an extra call. * */ static uint64_t vboxDtPOps_GetArgVal(void *pvProv, dtrace_id_t idProbe, void *pvProbe, int iArg, int cFrames) { PSUPDRVVDTPROVIDERCORE pProv = (PSUPDRVVDTPROVIDERCORE)pvProv; AssertPtrReturn(pProv, UINT64_MAX); LOG_DTRACE(("%s: %p / %p - %#x / %p iArg=%d cFrames=%u\n", __FUNCTION__, pProv, pProv->TracerData.DTrace.idProvider, idProbe, pvProbe, iArg, cFrames)); AssertReturn(iArg >= 5, UINT64_MAX); if (pProv->TracerData.DTrace.fZombie) return UINT64_MAX; uint32_t idxProbeLoc = (uint32_t)(uintptr_t)pvProbe; PCVTGPROBELOC pProbeLocRO = (PVTGPROBELOC)&pProv->paProbeLocsRO[idxProbeLoc]; PCVTGDESCPROBE pProbeDesc = pProbeLocRO->pProbe; PCVTGDESCARGLIST pArgList = (PCVTGDESCARGLIST)( (uintptr_t)pProv->pHdr + pProv->pHdr->offArgLists + pProbeDesc->offArgList); AssertReturn(pProbeDesc->offArgList < pProv->pHdr->cbArgLists, UINT64_MAX); PVBDTSTACKDATA pData = vboxDtGetStackData(); /* * Get the stack data. This is a wee bit complicated on 32-bit systems * since we want to support 64-bit integer arguments. */ uint64_t u64Ret; if (iArg >= 20) u64Ret = UINT64_MAX; else if (pData->enmCaller == kVBoxDtCaller_ProbeFireKernel) { #if ARCH_BITS == 64 u64Ret = pData->u.ProbeFireKernel.pauStackArgs[iArg - 5]; #else if ( !pArgList->fHaveLargeArgs || iArg >= pArgList->cArgs) u64Ret = pData->u.ProbeFireKernel.pauStackArgs[iArg - 5]; else { /* Similar to what we did for mac in when calling dtrace_probe(). */ uint32_t offArg = 0; for (int i = 5; i < iArg; i++) if (VTG_TYPE_IS_LARGE(pArgList->aArgs[iArg].fType)) offArg++; u64Ret = pData->u.ProbeFireKernel.pauStackArgs[iArg - 5 + offArg]; if (VTG_TYPE_IS_LARGE(pArgList->aArgs[iArg].fType)) u64Ret |= (uint64_t)pData->u.ProbeFireKernel.pauStackArgs[iArg - 5 + offArg + 1] << 32; } #endif } else if (pData->enmCaller == kVBoxDtCaller_ProbeFireUser) { int offArg = pData->u.ProbeFireUser.offArg; PCSUPDRVTRACERUSRCTX pCtx = pData->u.ProbeFireUser.pCtx; AssertPtrReturn(pCtx, UINT64_MAX); if (pCtx->cBits == 32) { if ( !pArgList->fHaveLargeArgs || iArg >= pArgList->cArgs) { if (iArg + offArg < (int)RT_ELEMENTS(pCtx->u.X86.aArgs)) u64Ret = pCtx->u.X86.aArgs[iArg + offArg]; else u64Ret = UINT64_MAX; } else { int i; for (i = 5; i < iArg; i++) if (VTG_TYPE_IS_LARGE(pArgList->aArgs[iArg].fType)) offArg++; if (offArg + iArg < (int)RT_ELEMENTS(pCtx->u.X86.aArgs)) { u64Ret = pCtx->u.X86.aArgs[iArg + offArg]; if ( VTG_TYPE_IS_LARGE(pArgList->aArgs[iArg].fType) && offArg + iArg + 1 < (int)RT_ELEMENTS(pCtx->u.X86.aArgs)) u64Ret |= (uint64_t)pCtx->u.X86.aArgs[iArg + offArg + 1] << 32; } else u64Ret = UINT64_MAX; } } else { if (iArg + offArg < (int)RT_ELEMENTS(pCtx->u.Amd64.aArgs)) u64Ret = pCtx->u.Amd64.aArgs[iArg + offArg]; else u64Ret = UINT64_MAX; } } else AssertFailedReturn(UINT64_MAX); LOG_DTRACE(("%s: returns %#llx\n", __FUNCTION__, u64Ret)); return u64Ret; } /** * @callback_method_impl{dtrace_pops_t,dtps_destroy} */ static void vboxDtPOps_Destroy(void *pvProv, dtrace_id_t idProbe, void *pvProbe) { PSUPDRVVDTPROVIDERCORE pProv = (PSUPDRVVDTPROVIDERCORE)pvProv; AssertPtrReturnVoid(pProv); LOG_DTRACE(("%s: %p / %p - %#x / %p\n", __FUNCTION__, pProv, pProv->TracerData.DTrace.idProvider, idProbe, pvProbe)); AssertReturnVoid(pProv->TracerData.DTrace.cProvidedProbes > 0); AssertPtrReturnVoid(pProv->TracerData.DTrace.idProvider); if (!pProv->TracerData.DTrace.fZombie) { uint32_t idxProbeLoc = (uint32_t)(uintptr_t)pvProbe; PCVTGPROBELOC pProbeLocRO = (PVTGPROBELOC)&pProv->paProbeLocsRO[idxProbeLoc]; uint32_t *pidProbe; if (!pProv->fUmod) { pidProbe = (uint32_t *)&pProbeLocRO->idProbe; Assert(!pProbeLocRO->fEnabled); Assert(*pidProbe == idProbe); } else { pidProbe = &pProv->paR0ProbeLocs[idxProbeLoc].idProbe; Assert(!pProv->paR0ProbeLocs[idxProbeLoc].fEnabled); Assert(*pidProbe == idProbe); NOREF(idProbe); } *pidProbe = 0; } pProv->TracerData.DTrace.cProvidedProbes--; } /** * DTrace provider method table. */ static const dtrace_pops_t g_vboxDtVtgProvOps = { /* .dtps_provide = */ vboxDtPOps_Provide, /* .dtps_provide_module = */ NULL, /* .dtps_enable = */ (FNPOPS_ENABLE *)vboxDtPOps_Enable, /* .dtps_disable = */ vboxDtPOps_Disable, /* .dtps_suspend = */ NULL, /* .dtps_resume = */ NULL, /* .dtps_getargdesc = */ vboxDtPOps_GetArgDesc, /* .dtps_getargval = */ vboxDtPOps_GetArgVal, /* .dtps_usermode = */ NULL, /* .dtps_destroy = */ vboxDtPOps_Destroy }; /* * * Support Driver Tracer Interface. * Support Driver Tracer Interface. * Support Driver Tracer Interface. * */ /** * interface_method_impl{SUPDRVTRACERREG,pfnProbeFireKernel} */ static DECLCALLBACK(void) vboxDtTOps_ProbeFireKernel(struct VTGPROBELOC *pVtgProbeLoc, uintptr_t uArg0, uintptr_t uArg1, uintptr_t uArg2, uintptr_t uArg3, uintptr_t uArg4) { AssertPtrReturnVoid(pVtgProbeLoc); LOG_DTRACE(("%s: %p / %p\n", __FUNCTION__, pVtgProbeLoc, pVtgProbeLoc->idProbe)); AssertPtrReturnVoid(pVtgProbeLoc->pProbe); AssertPtrReturnVoid(pVtgProbeLoc->pszFunction); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_ProbeFireKernel); pStackData->u.ProbeFireKernel.pauStackArgs = &uArg4 + 1; #if defined(RT_OS_DARWIN) && ARCH_BITS == 32 /* * Convert arguments from uintptr_t to uint64_t. */ PVTGDESCPROBE pProbe = (PVTGDESCPROBE)((PVTGPROBELOC)pVtgProbeLoc)->pProbe; AssertPtrReturnVoid(pProbe); PVTGOBJHDR pVtgHdr = (PVTGOBJHDR)((uintptr_t)pProbe + pProbe->offObjHdr); AssertPtrReturnVoid(pVtgHdr); PVTGDESCARGLIST pArgList = (PVTGDESCARGLIST)((uintptr_t)pVtgHdr + pVtgHdr->offArgLists + pProbe->offArgList); AssertPtrReturnVoid(pArgList); if (!pArgList->fHaveLargeArgs) dtrace_probe(pVtgProbeLoc->idProbe, uArg0, uArg1, uArg2, uArg3, uArg4); else { uintptr_t *auSrcArgs = &uArg0; uint32_t iSrcArg = 0; uint32_t iDstArg = 0; uint64_t au64DstArgs[5]; while ( iDstArg < RT_ELEMENTS(au64DstArgs) && iSrcArg < pArgList->cArgs) { au64DstArgs[iDstArg] = auSrcArgs[iSrcArg]; if (VTG_TYPE_IS_LARGE(pArgList->aArgs[iDstArg].fType)) au64DstArgs[iDstArg] |= (uint64_t)auSrcArgs[++iSrcArg] << 32; iSrcArg++; iDstArg++; } while (iDstArg < RT_ELEMENTS(au64DstArgs)) au64DstArgs[iDstArg++] = auSrcArgs[iSrcArg++]; pStackData->u.ProbeFireKernel.pauStackArgs = &auSrcArgs[iSrcArg]; dtrace_probe(pVtgProbeLoc->idProbe, au64DstArgs[0], au64DstArgs[1], au64DstArgs[2], au64DstArgs[3], au64DstArgs[4]); } #else dtrace_probe(pVtgProbeLoc->idProbe, uArg0, uArg1, uArg2, uArg3, uArg4); #endif VBDT_CLEAR_STACK_DATA(); LOG_DTRACE(("%s: returns\n", __FUNCTION__)); } /** * interface_method_impl{SUPDRVTRACERREG,pfnProbeFireUser} */ static DECLCALLBACK(void) vboxDtTOps_ProbeFireUser(PCSUPDRVTRACERREG pThis, PSUPDRVSESSION pSession, PCSUPDRVTRACERUSRCTX pCtx, PCVTGOBJHDR pVtgHdr, PCVTGPROBELOC pProbeLocRO) { LOG_DTRACE(("%s: %p / %p\n", __FUNCTION__, pCtx, pCtx->idProbe)); AssertPtrReturnVoid(pProbeLocRO); AssertPtrReturnVoid(pVtgHdr); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_ProbeFireUser); if (pCtx->cBits == 32) { pStackData->u.ProbeFireUser.pCtx = pCtx; pStackData->u.ProbeFireUser.offArg = 0; #if ARCH_BITS == 64 || defined(RT_OS_DARWIN) /* * Combine two 32-bit arguments into one 64-bit argument where needed. */ PVTGDESCPROBE pProbeDesc = pProbeLocRO->pProbe; AssertPtrReturnVoid(pProbeDesc); PVTGDESCARGLIST pArgList = (PVTGDESCARGLIST)((uintptr_t)pVtgHdr + pVtgHdr->offArgLists + pProbeDesc->offArgList); AssertPtrReturnVoid(pArgList); if (!pArgList->fHaveLargeArgs) dtrace_probe(pCtx->idProbe, pCtx->u.X86.aArgs[0], pCtx->u.X86.aArgs[1], pCtx->u.X86.aArgs[2], pCtx->u.X86.aArgs[3], pCtx->u.X86.aArgs[4]); else { uint32_t const *auSrcArgs = &pCtx->u.X86.aArgs[0]; uint32_t iSrcArg = 0; uint32_t iDstArg = 0; uint64_t au64DstArgs[5]; while ( iDstArg < RT_ELEMENTS(au64DstArgs) && iSrcArg < pArgList->cArgs) { au64DstArgs[iDstArg] = auSrcArgs[iSrcArg]; if (VTG_TYPE_IS_LARGE(pArgList->aArgs[iDstArg].fType)) au64DstArgs[iDstArg] |= (uint64_t)auSrcArgs[++iSrcArg] << 32; iSrcArg++; iDstArg++; } while (iDstArg < RT_ELEMENTS(au64DstArgs)) au64DstArgs[iDstArg++] = auSrcArgs[iSrcArg++]; pStackData->u.ProbeFireUser.offArg = iSrcArg - RT_ELEMENTS(au64DstArgs); dtrace_probe(pCtx->idProbe, au64DstArgs[0], au64DstArgs[1], au64DstArgs[2], au64DstArgs[3], au64DstArgs[4]); } #else dtrace_probe(pCtx->idProbe, pCtx->u.X86.aArgs[0], pCtx->u.X86.aArgs[1], pCtx->u.X86.aArgs[2], pCtx->u.X86.aArgs[3], pCtx->u.X86.aArgs[4]); #endif } else if (pCtx->cBits == 64) { pStackData->u.ProbeFireUser.pCtx = pCtx; pStackData->u.ProbeFireUser.offArg = 0; dtrace_probe(pCtx->idProbe, pCtx->u.Amd64.aArgs[0], pCtx->u.Amd64.aArgs[1], pCtx->u.Amd64.aArgs[2], pCtx->u.Amd64.aArgs[3], pCtx->u.Amd64.aArgs[4]); } else AssertFailed(); VBDT_CLEAR_STACK_DATA(); LOG_DTRACE(("%s: returns\n", __FUNCTION__)); } /** * interface_method_impl{SUPDRVTRACERREG,pfnTracerOpen} */ static DECLCALLBACK(int) vboxDtTOps_TracerOpen(PCSUPDRVTRACERREG pThis, PSUPDRVSESSION pSession, uint32_t uCookie, uintptr_t uArg, uintptr_t *puSessionData) { NOREF(pThis); NOREF(pSession); NOREF(uCookie); NOREF(uArg); *puSessionData = 0; return VERR_NOT_SUPPORTED; } /** * interface_method_impl{SUPDRVTRACERREG,pfnTracerClose} */ static DECLCALLBACK(int) vboxDtTOps_TracerIoCtl(PCSUPDRVTRACERREG pThis, PSUPDRVSESSION pSession, uintptr_t uSessionData, uintptr_t uCmd, uintptr_t uArg, int32_t *piRetVal) { NOREF(pThis); NOREF(pSession); NOREF(uSessionData); NOREF(uCmd); NOREF(uArg); NOREF(piRetVal); return VERR_NOT_SUPPORTED; } /** * interface_method_impl{SUPDRVTRACERREG,pfnTracerClose} */ static DECLCALLBACK(void) vboxDtTOps_TracerClose(PCSUPDRVTRACERREG pThis, PSUPDRVSESSION pSession, uintptr_t uSessionData) { NOREF(pThis); NOREF(pSession); NOREF(uSessionData); return; } /** * interface_method_impl{SUPDRVTRACERREG,pfnProviderRegister} */ static DECLCALLBACK(int) vboxDtTOps_ProviderRegister(PCSUPDRVTRACERREG pThis, PSUPDRVVDTPROVIDERCORE pCore) { LOG_DTRACE(("%s: %p %s/%s\n", __FUNCTION__, pThis, pCore->pszModName, pCore->pszName)); AssertReturn(pCore->TracerData.DTrace.idProvider == 0, VERR_INTERNAL_ERROR_3); PVTGDESCPROVIDER pDesc = pCore->pDesc; dtrace_pattr_t DtAttrs; vboxDtVtgConvAttr(&DtAttrs.dtpa_provider, &pDesc->AttrSelf); vboxDtVtgConvAttr(&DtAttrs.dtpa_mod, &pDesc->AttrModules); vboxDtVtgConvAttr(&DtAttrs.dtpa_func, &pDesc->AttrFunctions); vboxDtVtgConvAttr(&DtAttrs.dtpa_name, &pDesc->AttrNames); vboxDtVtgConvAttr(&DtAttrs.dtpa_args, &pDesc->AttrArguments); /* Note! DTrace may call us back before dtrace_register returns, so we have to point it to pCore->TracerData.DTrace.idProvider. */ AssertCompile(sizeof(dtrace_provider_id_t) == sizeof(pCore->TracerData.DTrace.idProvider)); int rc = dtrace_register(pCore->pszName, &DtAttrs, DTRACE_PRIV_KERNEL, NULL /* cred */, &g_vboxDtVtgProvOps, pCore, &pCore->TracerData.DTrace.idProvider); if (!rc) { LOG_DTRACE(("%s: idProvider=%p\n", __FUNCTION__, pCore->TracerData.DTrace.idProvider)); AssertPtr(pCore->TracerData.DTrace.idProvider); rc = VINF_SUCCESS; } else { pCore->TracerData.DTrace.idProvider = 0; rc = RTErrConvertFromErrno(FIX_UEK_RC(rc)); } LOG_DTRACE(("%s: returns %Rrc\n", __FUNCTION__, rc)); return rc; } /** * interface_method_impl{SUPDRVTRACERREG,pfnProviderDeregister} */ static DECLCALLBACK(int) vboxDtTOps_ProviderDeregister(PCSUPDRVTRACERREG pThis, PSUPDRVVDTPROVIDERCORE pCore) { uintptr_t idProvider = pCore->TracerData.DTrace.idProvider; LOG_DTRACE(("%s: %p / %p\n", __FUNCTION__, pThis, idProvider)); AssertPtrReturn(idProvider, VERR_INTERNAL_ERROR_3); dtrace_invalidate(idProvider); int rc = dtrace_unregister(idProvider); if (!rc) { pCore->TracerData.DTrace.idProvider = 0; rc = VINF_SUCCESS; } else { AssertMsg(FIX_UEK_RC(rc) == EBUSY, ("%d\n", rc)); pCore->TracerData.DTrace.fZombie = true; rc = VERR_TRY_AGAIN; } LOG_DTRACE(("%s: returns %Rrc\n", __FUNCTION__, rc)); return rc; } /** * interface_method_impl{SUPDRVTRACERREG,pfnProviderDeregisterZombie} */ static DECLCALLBACK(int) vboxDtTOps_ProviderDeregisterZombie(PCSUPDRVTRACERREG pThis, PSUPDRVVDTPROVIDERCORE pCore) { uintptr_t idProvider = pCore->TracerData.DTrace.idProvider; LOG_DTRACE(("%s: %p / %p\n", __FUNCTION__, pThis, idProvider)); AssertPtrReturn(idProvider, VERR_INTERNAL_ERROR_3); Assert(pCore->TracerData.DTrace.fZombie); int rc = dtrace_unregister(idProvider); if (!rc) { pCore->TracerData.DTrace.idProvider = 0; rc = VINF_SUCCESS; } else { AssertMsg(FIX_UEK_RC(rc) == EBUSY, ("%d\n", rc)); rc = VERR_TRY_AGAIN; } LOG_DTRACE(("%s: returns %Rrc\n", __FUNCTION__, rc)); return rc; } /** * The tracer registration record of the VBox DTrace implementation */ static SUPDRVTRACERREG g_VBoxDTraceReg = { SUPDRVTRACERREG_MAGIC, SUPDRVTRACERREG_VERSION, vboxDtTOps_ProbeFireKernel, vboxDtTOps_ProbeFireUser, vboxDtTOps_TracerOpen, vboxDtTOps_TracerIoCtl, vboxDtTOps_TracerClose, vboxDtTOps_ProviderRegister, vboxDtTOps_ProviderDeregister, vboxDtTOps_ProviderDeregisterZombie, SUPDRVTRACERREG_MAGIC }; /** * Module initialization code. */ const SUPDRVTRACERREG * VBOXCALL supdrvDTraceInit(void) { #if defined(RT_OS_DARWIN) || defined(RT_OS_LINUX) /* * Resolve the kernel symbols we need. */ # ifndef RT_OS_LINUX RTDBGKRNLINFO hKrnlInfo; int rc = RTR0DbgKrnlInfoOpen(&hKrnlInfo, 0); if (RT_FAILURE(rc)) { SUPR0Printf("supdrvDTraceInit: RTR0DbgKrnlInfoOpen failed with rc=%d.\n", rc); return NULL; } # endif static const struct { const char *pszName; PFNRT *ppfn; } s_aDTraceFunctions[] = { { "dtrace_probe", (PFNRT*)&dtrace_probe }, { "dtrace_probe_create", (PFNRT*)&dtrace_probe_create }, { "dtrace_probe_lookup", (PFNRT*)&dtrace_probe_lookup }, { "dtrace_register", (PFNRT*)&dtrace_register }, { "dtrace_invalidate", (PFNRT*)&dtrace_invalidate }, { "dtrace_unregister", (PFNRT*)&dtrace_unregister }, }; unsigned i; for (i = 0; i < RT_ELEMENTS(s_aDTraceFunctions); i++) { # ifndef RT_OS_LINUX rc = RTR0DbgKrnlInfoQuerySymbol(hKrnlInfo, NULL, s_aDTraceFunctions[i].pszName, (void **)s_aDTraceFunctions[i].ppfn); if (RT_FAILURE(rc)) { SUPR0Printf("supdrvDTraceInit: Failed to resolved '%s' (rc=%Rrc, i=%u).\n", s_aDTraceFunctions[i].pszName, rc, i); break; } # else unsigned long ulAddr = kallsyms_lookup_name(s_aDTraceFunctions[i].pszName); if (!ulAddr) { SUPR0Printf("supdrvDTraceInit: Failed to resolved '%s' (i=%u).\n", s_aDTraceFunctions[i].pszName, i); return NULL; } *s_aDTraceFunctions[i].ppfn = (PFNRT)ulAddr; # endif } # ifndef RT_OS_LINUX RTR0DbgKrnlInfoRelease(hKrnlInfo); if (RT_FAILURE(rc)) return NULL; # else /** @todo grab a reference to the dtrace module... */ # endif #endif return &g_VBoxDTraceReg; } #ifndef VBOX_WITH_NATIVE_DTRACE # error "VBOX_WITH_NATIVE_DTRACE is not defined as it should" #endif