/* $Id: VBoxDTraceR0.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */ /** @file * VBoxDTraceR0. * * Contributed by: bird */ /* * Copyright (C) 2012-2023 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from http://www.virtualbox.org. * * The contents of this file are subject to 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 distribution. * * SPDX-License-Identifier: CDDL-1.0 */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ //#if !defined(RT_OS_WINDOWS) && !defined(RT_OS_OS2) //# define HAVE_RTMEMALLOCEX_FEATURES //#endif /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** Caller indicator. */ typedef enum VBOXDTCALLER { kVBoxDtCaller_Invalid = 0, kVBoxDtCaller_Generic, kVBoxDtCaller_ProbeFireUser, kVBoxDtCaller_ProbeFireKernel } VBOXDTCALLER; /** * Stack data used for thread structure and such. * * This is planted in every external entry point and used to emulate solaris * curthread, CRED, curproc and similar. It is also used to get at the * uncached probe arguments. */ typedef struct VBoxDtStackData { /** Eyecatcher no. 1 (VBDT_STACK_DATA_MAGIC2). */ uint32_t u32Magic1; /** Eyecatcher no. 2 (VBDT_STACK_DATA_MAGIC2). */ uint32_t u32Magic2; /** The format of the caller specific data. */ VBOXDTCALLER enmCaller; /** Caller specific data. */ union { /** kVBoxDtCaller_ProbeFireKernel. */ struct { /** The caller. */ uintptr_t uCaller; /** 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; /** Credentials allocated by VBoxDtGetCurrentCreds. */ struct VBoxDtCred *pCred; /** Thread structure currently being held by this thread. */ struct VBoxDtThread *pThread; /** Pointer to this structure. * This is the final bit of integrity checking. */ struct VBoxDtStackData *pSelf; } VBDTSTACKDATA; /** Pointer to the on-stack thread specific data. */ typedef VBDTSTACKDATA *PVBDTSTACKDATA; /** The first magic value. */ #define VBDT_STACK_DATA_MAGIC1 RT_MAKE_U32_FROM_U8('V', 'B', 'o', 'x') /** The second magic value. */ #define VBDT_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 VBDT_STACK_DATA_ALIGN 32 /** Plants the stack data. */ #define VBDT_SETUP_STACK_DATA(a_enmCaller) \ uint8_t abBlob[sizeof(VBDTSTACKDATA) + VBDT_STACK_DATA_ALIGN - 1]; \ PVBDTSTACKDATA pStackData = (PVBDTSTACKDATA)( (uintptr_t)&abBlob[VBDT_STACK_DATA_ALIGN - 1] \ & ~(uintptr_t)(VBDT_STACK_DATA_ALIGN - 1)); \ pStackData->u32Magic1 = VBDT_STACK_DATA_MAGIC1; \ pStackData->u32Magic2 = VBDT_STACK_DATA_MAGIC2; \ pStackData->enmCaller = a_enmCaller; \ pStackData->pCred = NULL; \ pStackData->pThread = NULL; \ 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; \ if (pStackData->pCred) \ crfree(pStackData->pCred); \ if (pStackData->pThread) \ VBoxDtReleaseThread(pStackData->pThread); \ } 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 * *********************************************************************************************************************************/ /** Per CPU information */ cpucore_t g_aVBoxDtCpuCores[RTCPUSET_MAX_CPUS]; /** Dummy mutex. */ struct VBoxDtMutex g_DummyMtx; /** Pointer to the tracer helpers provided by VBoxDrv. */ static PCSUPDRVTRACERHLP g_pVBoxDTraceHlp; dtrace_cacheid_t dtrace_predcache_id = DTRACE_CACHEIDNONE + 1; #if 0 void (*dtrace_cpu_init)(processorid_t); void (*dtrace_modload)(struct modctl *); void (*dtrace_modunload)(struct modctl *); void (*dtrace_helpers_cleanup)(void); void (*dtrace_helpers_fork)(proc_t *, proc_t *); void (*dtrace_cpustart_init)(void); void (*dtrace_cpustart_fini)(void); void (*dtrace_cpc_fire)(uint64_t); void (*dtrace_debugger_init)(void); void (*dtrace_debugger_fini)(void); #endif /** * Gets the stack data. * * @returns Pointer to the stack data. Never NULL. */ static PVBDTSTACKDATA vboxDtGetStackData(void) { int volatile iDummy = 1; /* use this to get the stack address. */ PVBDTSTACKDATA pData = (PVBDTSTACKDATA)( ((uintptr_t)&iDummy + VBDT_STACK_DATA_ALIGN - 1) & ~(uintptr_t)(VBDT_STACK_DATA_ALIGN - 1)); for (;;) { if ( pData->u32Magic1 == VBDT_STACK_DATA_MAGIC1 && pData->u32Magic2 == VBDT_STACK_DATA_MAGIC2 && pData->pSelf == pData) return pData; pData = (PVBDTSTACKDATA)((uintptr_t)pData + VBDT_STACK_DATA_ALIGN); } } void dtrace_toxic_ranges(void (*pfnAddOne)(uintptr_t uBase, uintptr_t cbRange)) { /** @todo ? */ RT_NOREF_PV(pfnAddOne); } /** * Dummy callback used by dtrace_sync. */ static DECLCALLBACK(void) vboxDtSyncCallback(RTCPUID idCpu, void *pvUser1, void *pvUser2) { NOREF(idCpu); NOREF(pvUser1); NOREF(pvUser2); } /** * Synchronzie across all CPUs (expensive). */ void dtrace_sync(void) { int rc = RTMpOnAll(vboxDtSyncCallback, NULL, NULL); AssertRC(rc); } /** * Fetch a 8-bit "word" from userland. * * @return The byte value. * @param pvUserAddr The userland address. */ uint8_t dtrace_fuword8( void *pvUserAddr) { uint8_t u8; int rc = RTR0MemUserCopyFrom(&u8, (uintptr_t)pvUserAddr, sizeof(u8)); if (RT_FAILURE(rc)) { RTCPUID iCpu = VBDT_GET_CPUID(); cpu_core[iCpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; cpu_core[iCpu].cpuc_dtrace_illval = (uintptr_t)pvUserAddr; u8 = 0; } return u8; } /** * Fetch a 16-bit word from userland. * * @return The word value. * @param pvUserAddr The userland address. */ uint16_t dtrace_fuword16(void *pvUserAddr) { uint16_t u16; int rc = RTR0MemUserCopyFrom(&u16, (uintptr_t)pvUserAddr, sizeof(u16)); if (RT_FAILURE(rc)) { RTCPUID iCpu = VBDT_GET_CPUID(); cpu_core[iCpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; cpu_core[iCpu].cpuc_dtrace_illval = (uintptr_t)pvUserAddr; u16 = 0; } return u16; } /** * Fetch a 32-bit word from userland. * * @return The dword value. * @param pvUserAddr The userland address. */ uint32_t dtrace_fuword32(void *pvUserAddr) { uint32_t u32; int rc = RTR0MemUserCopyFrom(&u32, (uintptr_t)pvUserAddr, sizeof(u32)); if (RT_FAILURE(rc)) { RTCPUID iCpu = VBDT_GET_CPUID(); cpu_core[iCpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; cpu_core[iCpu].cpuc_dtrace_illval = (uintptr_t)pvUserAddr; u32 = 0; } return u32; } /** * Fetch a 64-bit word from userland. * * @return The qword value. * @param pvUserAddr The userland address. */ uint64_t dtrace_fuword64(void *pvUserAddr) { uint64_t u64; int rc = RTR0MemUserCopyFrom(&u64, (uintptr_t)pvUserAddr, sizeof(u64)); if (RT_FAILURE(rc)) { RTCPUID iCpu = VBDT_GET_CPUID(); cpu_core[iCpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; cpu_core[iCpu].cpuc_dtrace_illval = (uintptr_t)pvUserAddr; u64 = 0; } return u64; } /** copyin implementation */ int VBoxDtCopyIn(void const *pvUser, void *pvDst, size_t cb) { int rc = RTR0MemUserCopyFrom(pvDst, (uintptr_t)pvUser, cb); return RT_SUCCESS(rc) ? 0 : -1; } /** copyout implementation */ int VBoxDtCopyOut(void const *pvSrc, void *pvUser, size_t cb) { int rc = RTR0MemUserCopyTo((uintptr_t)pvUser, pvSrc, cb); return RT_SUCCESS(rc) ? 0 : -1; } /** * Copy data from userland into the kernel. * * @param uUserAddr The userland address. * @param uKrnlAddr The kernel buffer address. * @param cb The number of bytes to copy. * @param pfFlags Pointer to the relevant cpuc_dtrace_flags. */ void dtrace_copyin( uintptr_t uUserAddr, uintptr_t uKrnlAddr, size_t cb, volatile uint16_t *pfFlags) { int rc = RTR0MemUserCopyFrom((void *)uKrnlAddr, uUserAddr, cb); if (RT_FAILURE(rc)) { *pfFlags |= CPU_DTRACE_BADADDR; cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = uUserAddr; } } /** * Copy data from the kernel into userland. * * @param uKrnlAddr The kernel buffer address. * @param uUserAddr The userland address. * @param cb The number of bytes to copy. * @param pfFlags Pointer to the relevant cpuc_dtrace_flags. */ void dtrace_copyout( uintptr_t uKrnlAddr, uintptr_t uUserAddr, size_t cb, volatile uint16_t *pfFlags) { int rc = RTR0MemUserCopyTo(uUserAddr, (void const *)uKrnlAddr, cb); if (RT_FAILURE(rc)) { *pfFlags |= CPU_DTRACE_BADADDR; cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = uUserAddr; } } /** * Copy a string from userland into the kernel. * * @param uUserAddr The userland address. * @param uKrnlAddr The kernel buffer address. * @param cbMax The maximum number of bytes to copy. May stop * earlier if zero byte is encountered. * @param pfFlags Pointer to the relevant cpuc_dtrace_flags. */ void dtrace_copyinstr( uintptr_t uUserAddr, uintptr_t uKrnlAddr, size_t cbMax, volatile uint16_t *pfFlags) { if (!cbMax) return; char *pszDst = (char *)uKrnlAddr; int rc = RTR0MemUserCopyFrom(pszDst, uUserAddr, cbMax); if (RT_FAILURE(rc)) { /* Byte by byte - lazy bird! */ size_t off = 0; while (off < cbMax) { rc = RTR0MemUserCopyFrom(&pszDst[off], uUserAddr + off, 1); if (RT_FAILURE(rc)) { *pfFlags |= CPU_DTRACE_BADADDR; cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = uUserAddr; pszDst[off] = '\0'; return; } if (!pszDst[off]) return; off++; } } pszDst[cbMax - 1] = '\0'; } /** * Copy a string from the kernel and into user land. * * @param uKrnlAddr The kernel string address. * @param uUserAddr The userland address. * @param cbMax The maximum number of bytes to copy. Will stop * earlier if zero byte is encountered. * @param pfFlags Pointer to the relevant cpuc_dtrace_flags. */ void dtrace_copyoutstr(uintptr_t uKrnlAddr, uintptr_t uUserAddr, size_t cbMax, volatile uint16_t *pfFlags) { const char *pszSrc = (const char *)uKrnlAddr; size_t cbActual = RTStrNLen(pszSrc, cbMax); cbActual += cbActual < cbMax; dtrace_copyout(uKrnlAddr,uUserAddr, cbActual, pfFlags); } /** * Get the caller @a cCallFrames call frames up the stack. * * @returns The caller's return address or ~(uintptr_t)0. * @param cCallFrames The number of frames. */ uintptr_t dtrace_caller(int cCallFrames) { PVBDTSTACKDATA pData = vboxDtGetStackData(); if (pData->enmCaller == kVBoxDtCaller_ProbeFireKernel) return pData->u.ProbeFireKernel.uCaller; RT_NOREF_PV(cCallFrames); return ~(uintptr_t)0; } /** * Get argument number @a iArg @a cCallFrames call frames up the stack. * * @returns The caller's return address or ~(uintptr_t)0. * @param iArg The argument to get. * @param cCallFrames The number of frames. */ uint64_t dtrace_getarg(int iArg, int cCallFrames) { PVBDTSTACKDATA pData = vboxDtGetStackData(); AssertReturn(iArg >= 5, UINT64_MAX); if (pData->enmCaller == kVBoxDtCaller_ProbeFireKernel) return pData->u.ProbeFireKernel.pauStackArgs[iArg - 5]; RT_NOREF_PV(cCallFrames); return UINT64_MAX; } /** * Produce a traceback of the kernel stack. * * @param paPcStack Where to return the program counters. * @param cMaxFrames The maximum number of PCs to return. * @param cSkipFrames The number of artificial callstack frames to * skip at the top. * @param pIntr Not sure what this is... */ void dtrace_getpcstack(pc_t *paPcStack, int cMaxFrames, int cSkipFrames, uint32_t *pIntr) { int iFrame = 0; while (iFrame < cMaxFrames) { paPcStack[iFrame] = NULL; iFrame++; } RT_NOREF_PV(pIntr); RT_NOREF_PV(cSkipFrames); } /** * Get the number of call frames on the stack. * * @returns The stack depth. * @param cSkipFrames The number of artificial callstack frames to * skip at the top. */ int dtrace_getstackdepth(int cSkipFrames) { RT_NOREF_PV(cSkipFrames); return 1; } /** * Produce a traceback of the userland stack. * * @param paPcStack Where to return the program counters. * @param paFpStack Where to return the frame pointers. * @param cMaxFrames The maximum number of frames to return. */ void dtrace_getufpstack(uint64_t *paPcStack, uint64_t *paFpStack, int cMaxFrames) { int iFrame = 0; while (iFrame < cMaxFrames) { paPcStack[iFrame] = 0; paFpStack[iFrame] = 0; iFrame++; } } /** * Produce a traceback of the userland stack. * * @param paPcStack Where to return the program counters. * @param cMaxFrames The maximum number of frames to return. */ void dtrace_getupcstack(uint64_t *paPcStack, int cMaxFrames) { int iFrame = 0; while (iFrame < cMaxFrames) { paPcStack[iFrame] = 0; iFrame++; } } /** * Computes the depth of the userland stack. */ int dtrace_getustackdepth(void) { return 0; } /** * Get the current IPL/IRQL. * * @returns Current level. */ int dtrace_getipl(void) { #ifdef RT_ARCH_AMD64 /* CR8 is normally the same as IRQL / IPL on AMD64. */ return ASMGetCR8(); #else /* Just fake it on x86. */ return !ASMIntAreEnabled(); #endif } /** * Get current monotonic timestamp. * * @returns Timestamp, nano seconds. */ hrtime_t dtrace_gethrtime(void) { return RTTimeNanoTS(); } /** * Get current walltime. * * @returns Timestamp, nano seconds. */ hrtime_t dtrace_gethrestime(void) { /** @todo try get better resolution here somehow ... */ RTTIMESPEC Now; return RTTimeSpecGetNano(RTTimeNow(&Now)); } /** * DTrace panic routine. * * @param pszFormat Panic message. * @param va Arguments to the panic message. */ void dtrace_vpanic(const char *pszFormat, va_list va) { RTAssertMsg1(NULL, __LINE__, __FILE__, __FUNCTION__); RTAssertMsg2WeakV(pszFormat, va); RTR0AssertPanicSystem(); for (;;) { ASMBreakpoint(); volatile char *pchCrash = (volatile char *)~(uintptr_t)0; *pchCrash = '\0'; } } /** * DTrace panic routine. * * @param pszFormat Panic message. * @param ... Arguments to the panic message. */ void VBoxDtPanic(const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); dtrace_vpanic(pszFormat, va); /*va_end(va); - unreachable */ } /** * DTrace kernel message routine. * * @param pszFormat Kernel message. * @param ... Arguments to the panic message. */ void VBoxDtCmnErr(int iLevel, const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); SUPR0Printf("%N", pszFormat, va); va_end(va); RT_NOREF_PV(iLevel); } /** uprintf implementation */ void VBoxDtUPrintf(const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); VBoxDtUPrintfV(pszFormat, va); va_end(va); } /** vuprintf implementation */ void VBoxDtUPrintfV(const char *pszFormat, va_list va) { SUPR0Printf("%N", pszFormat, va); } /* CRED implementation. */ cred_t *VBoxDtGetCurrentCreds(void) { PVBDTSTACKDATA pData = vboxDtGetStackData(); if (!pData->pCred) { struct VBoxDtCred *pCred; #ifdef HAVE_RTMEMALLOCEX_FEATURES int rc = RTMemAllocEx(sizeof(*pCred), 0, RTMEMALLOCEX_FLAGS_ANY_CTX, (void **)&pCred); #else int rc = RTMemAllocEx(sizeof(*pCred), 0, 0, (void **)&pCred); #endif AssertFatalRC(rc); pCred->cr_refs = 1; /** @todo get the right creds on unix systems. */ pCred->cr_uid = 0; pCred->cr_ruid = 0; pCred->cr_suid = 0; pCred->cr_gid = 0; pCred->cr_rgid = 0; pCred->cr_sgid = 0; pCred->cr_zone = 0; pData->pCred = pCred; } return pData->pCred; } /* crhold implementation */ void VBoxDtCredHold(struct VBoxDtCred *pCred) { int32_t cRefs = ASMAtomicIncS32(&pCred->cr_refs); Assert(cRefs > 1); NOREF(cRefs); } /* crfree implementation */ void VBoxDtCredFree(struct VBoxDtCred *pCred) { int32_t cRefs = ASMAtomicDecS32(&pCred->cr_refs); Assert(cRefs >= 0); if (!cRefs) RTMemFreeEx(pCred, sizeof(*pCred)); } /** Spinlock protecting the thread structures. */ static RTSPINLOCK g_hThreadSpinlock = NIL_RTSPINLOCK; /** List of threads by usage age. */ static RTLISTANCHOR g_ThreadAgeList; /** Hash table for looking up thread structures. */ static struct VBoxDtThread *g_apThreadsHash[16384]; /** Fake kthread_t structures. * The size of this array is making horrible ASSUMPTIONS about the number of * thread in the system that will be subjected to DTracing. */ static struct VBoxDtThread g_aThreads[8192]; static int vboxDtInitThreadDb(void) { int rc = RTSpinlockCreate(&g_hThreadSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "VBoxDtThreadDb"); if (RT_FAILURE(rc)) return rc; RTListInit(&g_ThreadAgeList); for (uint32_t i = 0; i < RT_ELEMENTS(g_aThreads); i++) { g_aThreads[i].hNative = NIL_RTNATIVETHREAD; g_aThreads[i].uPid = NIL_RTPROCESS; RTListPrepend(&g_ThreadAgeList, &g_aThreads[i].AgeEntry); } return VINF_SUCCESS; } static void vboxDtTermThreadDb(void) { RTSpinlockDestroy(g_hThreadSpinlock); g_hThreadSpinlock = NIL_RTSPINLOCK; RTListInit(&g_ThreadAgeList); } /* curthread implementation, providing a fake kthread_t. */ struct VBoxDtThread *VBoxDtGetCurrentThread(void) { /* * Once we've retrieved a thread, we hold on to it until the thread exits * the VBoxDTrace module. */ PVBDTSTACKDATA pData = vboxDtGetStackData(); if (pData->pThread) { AssertPtr(pData->pThread); Assert(pData->pThread->hNative == RTThreadNativeSelf()); Assert(pData->pThread->uPid == RTProcSelf()); Assert(RTListIsEmpty(&pData->pThread->AgeEntry)); return pData->pThread; } /* * Lookup the thread in the hash table. */ RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf(); RTPROCESS uPid = RTProcSelf(); uintptr_t iHash = (hNativeSelf * 2654435761U) % RT_ELEMENTS(g_apThreadsHash); RTSpinlockAcquire(g_hThreadSpinlock); struct VBoxDtThread *pThread = g_apThreadsHash[iHash]; while (pThread) { if (pThread->hNative == hNativeSelf) { if (pThread->uPid != uPid) { /* Re-initialize the reused thread. */ pThread->uPid = uPid; pThread->t_dtrace_vtime = 0; pThread->t_dtrace_start = 0; pThread->t_dtrace_stop = 0; pThread->t_dtrace_scrpc = 0; pThread->t_dtrace_astpc = 0; pThread->t_predcache = 0; } /* Hold the thread in the on-stack data, making sure it does not get reused till the thread leaves VBoxDTrace. */ RTListNodeRemove(&pThread->AgeEntry); pData->pThread = pThread; RTSpinlockRelease(g_hThreadSpinlock); return pThread; } pThread = pThread->pNext; } /* * Unknown thread. Allocate a new entry, recycling unused or old ones. */ pThread = RTListGetLast(&g_ThreadAgeList, struct VBoxDtThread, AgeEntry); AssertFatal(pThread); RTListNodeRemove(&pThread->AgeEntry); if (pThread->hNative != NIL_RTNATIVETHREAD) { uintptr_t iHash2 = (pThread->hNative * 2654435761U) % RT_ELEMENTS(g_apThreadsHash); if (g_apThreadsHash[iHash2] == pThread) g_apThreadsHash[iHash2] = pThread->pNext; else { for (struct VBoxDtThread *pPrev = g_apThreadsHash[iHash2]; ; pPrev = pPrev->pNext) { AssertPtr(pPrev); if (pPrev->pNext == pThread) { pPrev->pNext = pThread->pNext; break; } } } } /* * Initialize the data. */ pThread->t_dtrace_vtime = 0; pThread->t_dtrace_start = 0; pThread->t_dtrace_stop = 0; pThread->t_dtrace_scrpc = 0; pThread->t_dtrace_astpc = 0; pThread->t_predcache = 0; pThread->hNative = hNativeSelf; pThread->uPid = uPid; /* * Add it to the hash as well as the on-stack data. */ pThread->pNext = g_apThreadsHash[iHash]; g_apThreadsHash[iHash] = pThread->pNext; pData->pThread = pThread; RTSpinlockRelease(g_hThreadSpinlock); return pThread; } /** * Called by the stack data destructor. * * @param pThread The thread to release. * */ static void VBoxDtReleaseThread(struct VBoxDtThread *pThread) { RTSpinlockAcquire(g_hThreadSpinlock); RTListAppend(&g_ThreadAgeList, &pThread->AgeEntry); RTSpinlockRelease(g_hThreadSpinlock); } /* * * Virtual Memory / Resource Allocator. * Virtual Memory / Resource Allocator. * Virtual Memory / Resource Allocator. * */ /** The number of bits per chunk. * @remarks The 32 bytes are for heap headers and such like. */ #define VBOXDTVMEMCHUNK_BITS ( ((_64K - 32 - sizeof(uint32_t) * 2) / sizeof(uint32_t)) * 32) /** * Resource allocator chunk. */ typedef struct VBoxDtVMemChunk { /** The ordinal (unbased) of the first item. */ uint32_t iFirst; /** The current number of free items in this chunk. */ uint32_t cCurFree; /** The allocation bitmap. */ uint32_t bm[VBOXDTVMEMCHUNK_BITS / 32]; } VBOXDTVMEMCHUNK; /** Pointer to a resource allocator chunk. */ typedef VBOXDTVMEMCHUNK *PVBOXDTVMEMCHUNK; /** * Resource allocator instance. */ typedef struct VBoxDtVMem { /** Spinlock protecting the data (interrupt safe). */ RTSPINLOCK hSpinlock; /** Magic value. */ uint32_t u32Magic; /** The current number of free items in the chunks. */ uint32_t cCurFree; /** The current number of chunks that we have allocated. */ uint32_t cCurChunks; /** The configured resource base. */ uint32_t uBase; /** The configured max number of items. */ uint32_t cMaxItems; /** The size of the apChunks array. */ uint32_t cMaxChunks; /** Array of chunk pointers. * (The size is determined at creation.) */ PVBOXDTVMEMCHUNK apChunks[1]; } VBOXDTVMEM; /** Pointer to a resource allocator instance. */ typedef VBOXDTVMEM *PVBOXDTVMEM; /** Magic value for the VBOXDTVMEM structure. */ #define VBOXDTVMEM_MAGIC RT_MAKE_U32_FROM_U8('V', 'M', 'e', 'm') /* vmem_create implementation */ struct VBoxDtVMem *VBoxDtVMemCreate(const char *pszName, void *pvBase, size_t cb, size_t cbUnit, PFNRT pfnAlloc, PFNRT pfnFree, struct VBoxDtVMem *pSrc, size_t cbQCacheMax, uint32_t fFlags) { /* * Assert preconditions of this implementation. */ AssertMsgReturn((uintptr_t)pvBase <= UINT32_MAX, ("%p\n", pvBase), NULL); AssertMsgReturn(cb <= UINT32_MAX, ("%zu\n", cb), NULL); AssertMsgReturn((uintptr_t)pvBase + cb - 1 <= UINT32_MAX, ("%p %zu\n", pvBase, cb), NULL); AssertMsgReturn(cbUnit == 1, ("%zu\n", cbUnit), NULL); AssertReturn(!pfnAlloc, NULL); AssertReturn(!pfnFree, NULL); AssertReturn(!pSrc, NULL); AssertReturn(!cbQCacheMax, NULL); AssertReturn(fFlags & VM_SLEEP, NULL); AssertReturn(fFlags & VMC_IDENTIFIER, NULL); RT_NOREF_PV(pszName); /* * Allocate the instance. */ uint32_t cChunks = (uint32_t)cb / VBOXDTVMEMCHUNK_BITS; if (cb % VBOXDTVMEMCHUNK_BITS) cChunks++; PVBOXDTVMEM pThis = (PVBOXDTVMEM)RTMemAllocZ(RT_UOFFSETOF_DYN(VBOXDTVMEM, apChunks[cChunks])); if (!pThis) return NULL; int rc = RTSpinlockCreate(&pThis->hSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "VBoxDtVMem"); if (RT_FAILURE(rc)) { RTMemFree(pThis); return NULL; } pThis->u32Magic = VBOXDTVMEM_MAGIC; pThis->cCurFree = 0; pThis->cCurChunks = 0; pThis->uBase = (uint32_t)(uintptr_t)pvBase; pThis->cMaxItems = (uint32_t)cb; pThis->cMaxChunks = cChunks; return pThis; } /* vmem_destroy implementation */ void VBoxDtVMemDestroy(struct VBoxDtVMem *pThis) { if (!pThis) return; AssertPtrReturnVoid(pThis); AssertReturnVoid(pThis->u32Magic == VBOXDTVMEM_MAGIC); /* * Invalidate the instance. */ RTSpinlockAcquire(pThis->hSpinlock); /* paranoia */ pThis->u32Magic = 0; RTSpinlockRelease(pThis->hSpinlock); RTSpinlockDestroy(pThis->hSpinlock); /* * Free the chunks, then the instance. */ uint32_t iChunk = pThis->cCurChunks; while (iChunk-- > 0) { RTMemFree(pThis->apChunks[iChunk]); pThis->apChunks[iChunk] = NULL; } RTMemFree(pThis); } /* vmem_alloc implementation */ void *VBoxDtVMemAlloc(struct VBoxDtVMem *pThis, size_t cbMem, uint32_t fFlags) { /* * Validate input. */ AssertReturn(fFlags & VM_BESTFIT, NULL); AssertReturn(fFlags & VM_SLEEP, NULL); AssertReturn(cbMem == 1, NULL); AssertPtrReturn(pThis, NULL); AssertReturn(pThis->u32Magic == VBOXDTVMEM_MAGIC, NULL); /* * Allocation loop. */ RTSpinlockAcquire(pThis->hSpinlock); for (;;) { PVBOXDTVMEMCHUNK pChunk; uint32_t const cChunks = pThis->cCurChunks; if (RT_LIKELY(pThis->cCurFree > 0)) { for (uint32_t iChunk = 0; iChunk < cChunks; iChunk++) { pChunk = pThis->apChunks[iChunk]; if (pChunk->cCurFree > 0) { int iBit = ASMBitFirstClear(pChunk->bm, VBOXDTVMEMCHUNK_BITS); AssertMsgReturnStmt(iBit >= 0 && (unsigned)iBit < VBOXDTVMEMCHUNK_BITS, ("%d\n", iBit), RTSpinlockRelease(pThis->hSpinlock), NULL); ASMBitSet(pChunk->bm, iBit); pChunk->cCurFree--; pThis->cCurFree--; uint32_t iRet = (uint32_t)iBit + pChunk->iFirst + pThis->uBase; RTSpinlockRelease(pThis->hSpinlock); return (void *)(uintptr_t)iRet; } } AssertFailedBreak(); } /* Out of resources? */ if (cChunks >= pThis->cMaxChunks) break; /* * Allocate another chunk. */ uint32_t const iFirstBit = cChunks > 0 ? pThis->apChunks[cChunks - 1]->iFirst + VBOXDTVMEMCHUNK_BITS : 0; uint32_t const cFreeBits = cChunks + 1 == pThis->cMaxChunks ? pThis->cMaxItems - (iFirstBit - pThis->uBase) : VBOXDTVMEMCHUNK_BITS; Assert(cFreeBits <= VBOXDTVMEMCHUNK_BITS); RTSpinlockRelease(pThis->hSpinlock); pChunk = (PVBOXDTVMEMCHUNK)RTMemAllocZ(sizeof(*pChunk)); if (!pChunk) return NULL; pChunk->iFirst = iFirstBit; pChunk->cCurFree = cFreeBits; if (cFreeBits != VBOXDTVMEMCHUNK_BITS) { /* lazy bird. */ uint32_t iBit = cFreeBits; while (iBit < VBOXDTVMEMCHUNK_BITS) { ASMBitSet(pChunk->bm, iBit); iBit++; } } RTSpinlockAcquire(pThis->hSpinlock); /* * Insert the new chunk. If someone raced us here, we'll drop it to * avoid wasting resources. */ if (pThis->cCurChunks == cChunks) { pThis->apChunks[cChunks] = pChunk; pThis->cCurFree += pChunk->cCurFree; pThis->cCurChunks += 1; } else { RTSpinlockRelease(pThis->hSpinlock); RTMemFree(pChunk); RTSpinlockAcquire(pThis->hSpinlock); } } RTSpinlockRelease(pThis->hSpinlock); return NULL; } /* vmem_free implementation */ void VBoxDtVMemFree(struct VBoxDtVMem *pThis, void *pvMem, size_t cbMem) { /* * Validate input. */ AssertReturnVoid(cbMem == 1); AssertPtrReturnVoid(pThis); AssertReturnVoid(pThis->u32Magic == VBOXDTVMEM_MAGIC); AssertReturnVoid((uintptr_t)pvMem < UINT32_MAX); uint32_t uMem = (uint32_t)(uintptr_t)pvMem; AssertReturnVoid(uMem >= pThis->uBase); uMem -= pThis->uBase; AssertReturnVoid(uMem < pThis->cMaxItems); /* * Free it. */ RTSpinlockAcquire(pThis->hSpinlock); uint32_t const iChunk = uMem / VBOXDTVMEMCHUNK_BITS; if (iChunk < pThis->cCurChunks) { PVBOXDTVMEMCHUNK pChunk = pThis->apChunks[iChunk]; uint32_t iBit = uMem - pChunk->iFirst; AssertReturnVoidStmt(iBit < VBOXDTVMEMCHUNK_BITS, RTSpinlockRelease(pThis->hSpinlock)); AssertReturnVoidStmt(ASMBitTestAndClear(pChunk->bm, iBit), RTSpinlockRelease(pThis->hSpinlock)); pChunk->cCurFree++; pThis->cCurFree++; } RTSpinlockRelease(pThis->hSpinlock); } /* * * Memory Allocators. * Memory Allocators. * Memory Allocators. * */ /* kmem_alloc implementation */ void *VBoxDtKMemAlloc(size_t cbMem, uint32_t fFlags) { void *pvMem; #ifdef HAVE_RTMEMALLOCEX_FEATURES uint32_t fMemAllocFlags = fFlags & KM_NOSLEEP ? RTMEMALLOCEX_FLAGS_ANY_CTX : 0; #else uint32_t fMemAllocFlags = 0; RT_NOREF_PV(fFlags); #endif int rc = RTMemAllocEx(cbMem, 0, fMemAllocFlags, &pvMem); AssertRCReturn(rc, NULL); AssertPtr(pvMem); return pvMem; } /* kmem_zalloc implementation */ void *VBoxDtKMemAllocZ(size_t cbMem, uint32_t fFlags) { void *pvMem; #ifdef HAVE_RTMEMALLOCEX_FEATURES uint32_t fMemAllocFlags = (fFlags & KM_NOSLEEP ? RTMEMALLOCEX_FLAGS_ANY_CTX : 0) | RTMEMALLOCEX_FLAGS_ZEROED; #else uint32_t fMemAllocFlags = RTMEMALLOCEX_FLAGS_ZEROED; RT_NOREF_PV(fFlags); #endif int rc = RTMemAllocEx(cbMem, 0, fMemAllocFlags, &pvMem); AssertRCReturn(rc, NULL); AssertPtr(pvMem); return pvMem; } /* kmem_free implementation */ void VBoxDtKMemFree(void *pvMem, size_t cbMem) { RTMemFreeEx(pvMem, cbMem); } /** * Memory cache mockup structure. * No slab allocator here! */ struct VBoxDtMemCache { uint32_t u32Magic; size_t cbBuf; size_t cbAlign; }; /* Limited kmem_cache_create implementation. */ struct VBoxDtMemCache *VBoxDtKMemCacheCreate(const char *pszName, size_t cbBuf, size_t cbAlign, PFNRT pfnCtor, PFNRT pfnDtor, PFNRT pfnReclaim, void *pvUser, void *pvVM, uint32_t fFlags) { /* * Check the input. */ AssertReturn(cbBuf > 0 && cbBuf < _1G, NULL); AssertReturn(RT_IS_POWER_OF_TWO(cbAlign), NULL); AssertReturn(!pfnCtor, NULL); AssertReturn(!pfnDtor, NULL); AssertReturn(!pfnReclaim, NULL); AssertReturn(!pvUser, NULL); AssertReturn(!pvVM, NULL); AssertReturn(!fFlags, NULL); RT_NOREF_PV(pszName); /* * Create a parameter container. Don't bother with anything fancy here yet, * just get something working. */ struct VBoxDtMemCache *pThis = (struct VBoxDtMemCache *)RTMemAlloc(sizeof(*pThis)); if (!pThis) return NULL; pThis->cbAlign = cbAlign; pThis->cbBuf = cbBuf; return pThis; } /* Limited kmem_cache_destroy implementation. */ void VBoxDtKMemCacheDestroy(struct VBoxDtMemCache *pThis) { RTMemFree(pThis); } /* kmem_cache_alloc implementation. */ void *VBoxDtKMemCacheAlloc(struct VBoxDtMemCache *pThis, uint32_t fFlags) { void *pvMem; #ifdef HAVE_RTMEMALLOCEX_FEATURES uint32_t fMemAllocFlags = (fFlags & KM_NOSLEEP ? RTMEMALLOCEX_FLAGS_ANY_CTX : 0) | RTMEMALLOCEX_FLAGS_ZEROED; #else uint32_t fMemAllocFlags = RTMEMALLOCEX_FLAGS_ZEROED; RT_NOREF_PV(fFlags); #endif int rc = RTMemAllocEx(pThis->cbBuf, /*pThis->cbAlign*/0, fMemAllocFlags, &pvMem); AssertRCReturn(rc, NULL); AssertPtr(pvMem); return pvMem; } /* kmem_cache_free implementation. */ void VBoxDtKMemCacheFree(struct VBoxDtMemCache *pThis, void *pvMem) { RTMemFreeEx(pvMem, pThis->cbBuf); } /* * * Mutex Semaphore Wrappers. * */ /** Initializes a mutex. */ int VBoxDtMutexInit(struct VBoxDtMutex *pMtx) { AssertReturn(pMtx != &g_DummyMtx, -1); AssertPtr(pMtx); pMtx->hOwner = NIL_RTNATIVETHREAD; pMtx->hMtx = NIL_RTSEMMUTEX; int rc = RTSemMutexCreate(&pMtx->hMtx); if (RT_SUCCESS(rc)) return 0; return -1; } /** Deletes a mutex. */ void VBoxDtMutexDelete(struct VBoxDtMutex *pMtx) { AssertReturnVoid(pMtx != &g_DummyMtx); AssertPtr(pMtx); if (pMtx->hMtx == NIL_RTSEMMUTEX) return; Assert(pMtx->hOwner == NIL_RTNATIVETHREAD); int rc = RTSemMutexDestroy(pMtx->hMtx); AssertRC(rc); pMtx->hMtx = NIL_RTSEMMUTEX; } /* mutex_enter implementation */ void VBoxDtMutexEnter(struct VBoxDtMutex *pMtx) { AssertPtr(pMtx); if (pMtx == &g_DummyMtx) return; RTNATIVETHREAD hSelf = RTThreadNativeSelf(); int rc = RTSemMutexRequest(pMtx->hMtx, RT_INDEFINITE_WAIT); AssertFatalRC(rc); Assert(pMtx->hOwner == NIL_RTNATIVETHREAD); pMtx->hOwner = hSelf; } /* mutex_exit implementation */ void VBoxDtMutexExit(struct VBoxDtMutex *pMtx) { AssertPtr(pMtx); if (pMtx == &g_DummyMtx) return; Assert(pMtx->hOwner == RTThreadNativeSelf()); pMtx->hOwner = NIL_RTNATIVETHREAD; int rc = RTSemMutexRelease(pMtx->hMtx); AssertFatalRC(rc); } /* MUTEX_HELD implementation */ bool VBoxDtMutexIsOwner(struct VBoxDtMutex *pMtx) { AssertPtrReturn(pMtx, false); if (pMtx == &g_DummyMtx) return true; return pMtx->hOwner == RTThreadNativeSelf(); } /* * * 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); for (uint32_t 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 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); RT_NOREF_PV(idProbe); 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); RT_NOREF_PV(idProbe); 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]); ASMAtomicDecU32(&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; RT_NOREF_PV(idProbe); 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} */ 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); RT_NOREF_PV(idProbe); RT_NOREF_PV(cFrames); 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 { for (int 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 = */ 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 = 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); RT_NOREF_PV(pThis); RT_NOREF_PV(pSession); 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) { if (uCookie != RT_MAKE_U32_FROM_U8('V', 'B', 'D', 'T')) return VERR_INVALID_MAGIC; if (uArg) return VERR_INVALID_PARAMETER; RT_NOREF_PV(pThis); RT_NOREF_PV(pSession); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_Generic); int rc = dtrace_open((dtrace_state_t **)puSessionData, VBoxDtGetCurrentCreds()); VBDT_CLEAR_STACK_DATA(); return RTErrConvertFromErrno(rc); } /** * 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) { AssertPtrReturn(uSessionData, VERR_INVALID_POINTER); RT_NOREF_PV(pThis); RT_NOREF_PV(pSession); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_Generic); int rc = dtrace_ioctl((dtrace_state_t *)uSessionData, (intptr_t)uCmd, (intptr_t)uArg, piRetVal); VBDT_CLEAR_STACK_DATA(); return RTErrConvertFromErrno(rc); } /** * interface_method_impl{SUPDRVTRACERREG,pfnTracerClose} */ static DECLCALLBACK(void) vboxDtTOps_TracerClose(PCSUPDRVTRACERREG pThis, PSUPDRVSESSION pSession, uintptr_t uSessionData) { AssertPtrReturnVoid(uSessionData); RT_NOREF_PV(pThis); RT_NOREF_PV(pSession); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_Generic); dtrace_close((dtrace_state_t *)uSessionData); VBDT_CLEAR_STACK_DATA(); } /** * 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); RT_NOREF_PV(pThis); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_Generic); 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(rc); } VBDT_CLEAR_STACK_DATA(); 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); RT_NOREF_PV(pThis); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_Generic); dtrace_invalidate(idProvider); int rc = dtrace_unregister(idProvider); if (!rc) { pCore->TracerData.DTrace.idProvider = 0; rc = VINF_SUCCESS; } else { AssertMsg(rc == EBUSY, ("%d\n", rc)); pCore->TracerData.DTrace.fZombie = true; rc = VERR_TRY_AGAIN; } VBDT_CLEAR_STACK_DATA(); 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); RT_NOREF_PV(pThis); VBDT_SETUP_STACK_DATA(kVBoxDtCaller_Generic); int rc = dtrace_unregister(idProvider); if (!rc) { pCore->TracerData.DTrace.idProvider = 0; rc = VINF_SUCCESS; } else { AssertMsg(rc == EBUSY, ("%d\n", rc)); rc = VERR_TRY_AGAIN; } VBDT_CLEAR_STACK_DATA(); 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 termination code. * * @param hMod Opque module handle. */ DECLEXPORT(void) ModuleTerm(void *hMod) { SUPR0TracerDeregisterImpl(hMod, NULL); dtrace_detach(); vboxDtTermThreadDb(); } /** * Module initialization code. * * @param hMod Opque module handle. */ DECLEXPORT(int) ModuleInit(void *hMod) { int rc = vboxDtInitThreadDb(); if (RT_SUCCESS(rc)) { rc = dtrace_attach(); if (rc == DDI_SUCCESS) { rc = SUPR0TracerRegisterImpl(hMod, NULL, &g_VBoxDTraceReg, &g_pVBoxDTraceHlp); if (RT_SUCCESS(rc)) return rc; dtrace_detach(); } else { SUPR0Printf("dtrace_attach -> %d\n", rc); rc = VERR_INTERNAL_ERROR_5; } vboxDtTermThreadDb(); } else SUPR0Printf("vboxDtInitThreadDb -> %d\n", rc); return rc; }