DBGFOS.cpp@ 71800

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1	/* $Id: DBGFOS.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Guest OS Diggers.
4	*/
5
6	/*
7	* Copyright (C) 2008-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_DBGF
23	#include <VBox/vmm/dbgf.h>
24	#include <VBox/vmm/mm.h>
25	#include "DBGFInternal.h"
26	#include <VBox/vmm/uvm.h>
27	#include <VBox/err.h>
28	#include <VBox/log.h>
29
30	#include <iprt/assert.h>
31	#include <iprt/thread.h>
32	#include <iprt/param.h>
33
34
35	/*********************************************************************************************************************************
36	* Defined Constants And Macros *
37	*********************************************************************************************************************************/
38
39	#define DBGF_OS_READ_LOCK(pUVM) \
40	do { int rcLock = RTCritSectRwEnterShared(&pUVM->dbgf.s.CritSect); AssertRC(rcLock); } while (0)
41	#define DBGF_OS_READ_UNLOCK(pUVM) \
42	do { int rcLock = RTCritSectRwLeaveShared(&pUVM->dbgf.s.CritSect); AssertRC(rcLock); } while (0)
43
44	#define DBGF_OS_WRITE_LOCK(pUVM) \
45	do { int rcLock = RTCritSectRwEnterExcl(&pUVM->dbgf.s.CritSect); AssertRC(rcLock); } while (0)
46	#define DBGF_OS_WRITE_UNLOCK(pUVM) \
47	do { int rcLock = RTCritSectRwLeaveExcl(&pUVM->dbgf.s.CritSect); AssertRC(rcLock); } while (0)
48
49
50	/*********************************************************************************************************************************
51	* Structures and Typedefs *
52	*********************************************************************************************************************************/
53	/**
54	* EMT interface wrappers.
55	*
56	* The diggers expects to be called on an EMT. To avoid the debugger+Main having
57	*
58	* Since the user (debugger/Main) shouldn't be calling directly into the digger code, but rather
59	*/
60	typedef struct DBGFOSEMTWRAPPER
61	{
62	/** Pointer to the next list entry. */
63	struct DBGFOSEMTWRAPPER *pNext;
64	/** The interface type. */
65	DBGFOSINTERFACE enmIf;
66	/** The digger interface pointer. */
67	union
68	{
69	/** Generic void pointer. */
70	void *pv;
71	/** DBGFOSINTERFACE_DMESG.*/
72	PDBGFOSIDMESG pDmesg;
73	} uDigger;
74	/** The user mode VM handle. */
75	PUVM pUVM;
76	/** The wrapper interface union (consult enmIf). */
77	union
78	{
79	/** DBGFOSINTERFACE_DMESG.*/
80	DBGFOSIDMESG Dmesg;
81	} uWrapper;
82	} DBGFOSEMTWRAPPER;
83	/** Pointer to an EMT interface wrapper. */
84	typedef DBGFOSEMTWRAPPER *PDBGFOSEMTWRAPPER;
85
86
87	/**
88	* Internal init routine called by DBGFR3Init().
89	*
90	* @returns VBox status code.
91	* @param pUVM The user mode VM handle.
92	*/
93	int dbgfR3OSInit(PUVM pUVM)
94	{
95	RT_NOREF_PV(pUVM);
96	return VINF_SUCCESS;
97	}
98
99
100	/**
101	* Internal cleanup routine called by DBGFR3Term().
102	*
103	* @param pUVM The user mode VM handle.
104	*/
105	void dbgfR3OSTerm(PUVM pUVM)
106	{
107	DBGF_OS_WRITE_LOCK(pUVM);
108
109	/*
110	* Terminate the current one.
111	*/
112	if (pUVM->dbgf.s.pCurOS)
113	{
114	pUVM->dbgf.s.pCurOS->pReg->pfnTerm(pUVM, pUVM->dbgf.s.pCurOS->abData);
115	pUVM->dbgf.s.pCurOS = NULL;
116	}
117
118	/*
119	* Destroy all the instances.
120	*/
121	while (pUVM->dbgf.s.pOSHead)
122	{
123	PDBGFOS pOS = pUVM->dbgf.s.pOSHead;
124	pUVM->dbgf.s.pOSHead = pOS->pNext;
125	if (pOS->pReg->pfnDestruct)
126	pOS->pReg->pfnDestruct(pUVM, pOS->abData);
127
128	PDBGFOSEMTWRAPPER pFree = pOS->pWrapperHead;
129	while ((pFree = pOS->pWrapperHead) != NULL)
130	{
131	pOS->pWrapperHead = pFree->pNext;
132	pFree->pNext = NULL;
133	MMR3HeapFree(pFree);
134	}
135
136	MMR3HeapFree(pOS);
137	}
138
139	DBGF_OS_WRITE_UNLOCK(pUVM);
140	}
141
142
143	/**
144	* EMT worker function for DBGFR3OSRegister.
145	*
146	* @returns VBox status code.
147	* @param pUVM The user mode VM handle.
148	* @param pReg The registration structure.
149	*/
150	static DECLCALLBACK(int) dbgfR3OSRegister(PUVM pUVM, PDBGFOSREG pReg)
151	{
152	/* more validations. */
153	DBGF_OS_READ_LOCK(pUVM);
154	PDBGFOS pOS;
155	for (pOS = pUVM->dbgf.s.pOSHead; pOS; pOS = pOS->pNext)
156	if (!strcmp(pOS->pReg->szName, pReg->szName))
157	{
158	DBGF_OS_READ_UNLOCK(pUVM);
159	Log(("dbgfR3OSRegister: %s -> VERR_ALREADY_LOADED\n", pReg->szName));
160	return VERR_ALREADY_LOADED;
161	}
162	DBGF_OS_READ_UNLOCK(pUVM);
163
164	/*
165	* Allocate a new structure, call the constructor and link it into the list.
166	*/
167	pOS = (PDBGFOS)MMR3HeapAllocZU(pUVM, MM_TAG_DBGF_OS, RT_OFFSETOF(DBGFOS, abData[pReg->cbData]));
168	AssertReturn(pOS, VERR_NO_MEMORY);
169	pOS->pReg = pReg;
170
171	int rc = pOS->pReg->pfnConstruct(pUVM, pOS->abData);
172	if (RT_SUCCESS(rc))
173	{
174	DBGF_OS_WRITE_LOCK(pUVM);
175	pOS->pNext = pUVM->dbgf.s.pOSHead;
176	pUVM->dbgf.s.pOSHead = pOS;
177	DBGF_OS_WRITE_UNLOCK(pUVM);
178	}
179	else
180	{
181	if (pOS->pReg->pfnDestruct)
182	pOS->pReg->pfnDestruct(pUVM, pOS->abData);
183	MMR3HeapFree(pOS);
184	}
185
186	return VINF_SUCCESS;
187	}
188
189
190	/**
191	* Registers a guest OS digger.
192	*
193	* This will instantiate an instance of the digger and add it
194	* to the list for us in the next call to DBGFR3OSDetect().
195	*
196	* @returns VBox status code.
197	* @param pUVM The user mode VM handle.
198	* @param pReg The registration structure.
199	* @thread Any.
200	*/
201	VMMR3DECL(int) DBGFR3OSRegister(PUVM pUVM, PCDBGFOSREG pReg)
202	{
203	/*
204	* Validate intput.
205	*/
206	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
207
208	AssertPtrReturn(pReg, VERR_INVALID_POINTER);
209	AssertReturn(pReg->u32Magic == DBGFOSREG_MAGIC, VERR_INVALID_MAGIC);
210	AssertReturn(pReg->u32EndMagic == DBGFOSREG_MAGIC, VERR_INVALID_MAGIC);
211	AssertReturn(!pReg->fFlags, VERR_INVALID_PARAMETER);
212	AssertReturn(pReg->cbData < _2G, VERR_INVALID_PARAMETER);
213	AssertReturn(pReg->szName[0], VERR_INVALID_NAME);
214	AssertReturn(RTStrEnd(&pReg->szName[0], sizeof(pReg->szName)), VERR_INVALID_NAME);
215	AssertPtrReturn(pReg->pfnConstruct, VERR_INVALID_POINTER);
216	AssertPtrNullReturn(pReg->pfnDestruct, VERR_INVALID_POINTER);
217	AssertPtrReturn(pReg->pfnProbe, VERR_INVALID_POINTER);
218	AssertPtrReturn(pReg->pfnInit, VERR_INVALID_POINTER);
219	AssertPtrReturn(pReg->pfnRefresh, VERR_INVALID_POINTER);
220	AssertPtrReturn(pReg->pfnTerm, VERR_INVALID_POINTER);
221	AssertPtrReturn(pReg->pfnQueryVersion, VERR_INVALID_POINTER);
222	AssertPtrReturn(pReg->pfnQueryInterface, VERR_INVALID_POINTER);
223
224	/*
225	* Pass it on to EMT(0).
226	*/
227	return VMR3ReqPriorityCallWaitU(pUVM, 0 /idDstCpu/, (PFNRT)dbgfR3OSRegister, 2, pUVM, pReg);
228	}
229
230
231	/**
232	* EMT worker function for DBGFR3OSDeregister.
233	*
234	* @returns VBox status code.
235	* @param pUVM The user mode VM handle.
236	* @param pReg The registration structure.
237	*/
238	static DECLCALLBACK(int) dbgfR3OSDeregister(PUVM pUVM, PDBGFOSREG pReg)
239	{
240	/*
241	* Unlink it.
242	*/
243	bool fWasCurOS = false;
244	PDBGFOS pOSPrev = NULL;
245	PDBGFOS pOS;
246	DBGF_OS_WRITE_LOCK(pUVM);
247	for (pOS = pUVM->dbgf.s.pOSHead; pOS; pOSPrev = pOS, pOS = pOS->pNext)
248	if (pOS->pReg == pReg)
249	{
250	if (pOSPrev)
251	pOSPrev->pNext = pOS->pNext;
252	else
253	pUVM->dbgf.s.pOSHead = pOS->pNext;
254	if (pUVM->dbgf.s.pCurOS == pOS)
255	{
256	pUVM->dbgf.s.pCurOS = NULL;
257	fWasCurOS = true;
258	}
259	break;
260	}
261	DBGF_OS_WRITE_UNLOCK(pUVM);
262	if (!pOS)
263	{
264	Log(("DBGFR3OSDeregister: %s -> VERR_NOT_FOUND\n", pReg->szName));
265	return VERR_NOT_FOUND;
266	}
267
268	/*
269	* Terminate it if it was the current OS, then invoke the
270	* destructor and clean up.
271	*/
272	if (fWasCurOS)
273	pOS->pReg->pfnTerm(pUVM, pOS->abData);
274	if (pOS->pReg->pfnDestruct)
275	pOS->pReg->pfnDestruct(pUVM, pOS->abData);
276
277	PDBGFOSEMTWRAPPER pFree = pOS->pWrapperHead;
278	while ((pFree = pOS->pWrapperHead) != NULL)
279	{
280	pOS->pWrapperHead = pFree->pNext;
281	pFree->pNext = NULL;
282	MMR3HeapFree(pFree);
283	}
284
285	MMR3HeapFree(pOS);
286
287	return VINF_SUCCESS;
288	}
289
290
291	/**
292	* Deregisters a guest OS digger previously registered by DBGFR3OSRegister.
293	*
294	* @returns VBox status code.
295	*
296	* @param pUVM The user mode VM handle.
297	* @param pReg The registration structure.
298	* @thread Any.
299	*/
300	VMMR3DECL(int) DBGFR3OSDeregister(PUVM pUVM, PCDBGFOSREG pReg)
301	{
302	/*
303	* Validate input.
304	*/
305	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
306	AssertPtrReturn(pReg, VERR_INVALID_POINTER);
307	AssertReturn(pReg->u32Magic == DBGFOSREG_MAGIC, VERR_INVALID_MAGIC);
308	AssertReturn(pReg->u32EndMagic == DBGFOSREG_MAGIC, VERR_INVALID_MAGIC);
309	AssertReturn(RTStrEnd(&pReg->szName[0], sizeof(pReg->szName)), VERR_INVALID_NAME);
310
311	DBGF_OS_READ_LOCK(pUVM);
312	PDBGFOS pOS;
313	for (pOS = pUVM->dbgf.s.pOSHead; pOS; pOS = pOS->pNext)
314	if (pOS->pReg == pReg)
315	break;
316	DBGF_OS_READ_UNLOCK(pUVM);
317
318	if (!pOS)
319	{
320	Log(("DBGFR3OSDeregister: %s -> VERR_NOT_FOUND\n", pReg->szName));
321	return VERR_NOT_FOUND;
322	}
323
324	/*
325	* Pass it on to EMT(0).
326	*/
327	return VMR3ReqPriorityCallWaitU(pUVM, 0 /idDstCpu/, (PFNRT)dbgfR3OSDeregister, 2, pUVM, pReg);
328	}
329
330
331	/**
332	* EMT worker function for DBGFR3OSDetect.
333	*
334	* @returns VBox status code.
335	* @retval VINF_SUCCESS if successfully detected.
336	* @retval VINF_DBGF_OS_NOT_DETCTED if we cannot figure it out.
337	*
338	* @param pUVM The user mode VM handle.
339	* @param pszName Where to store the OS name. Empty string if not detected.
340	* @param cchName Size of the buffer.
341	*/
342	static DECLCALLBACK(int) dbgfR3OSDetect(PUVM pUVM, char *pszName, size_t cchName)
343	{
344	/*
345	* Cycle thru the detection routines.
346	*/
347	DBGF_OS_WRITE_LOCK(pUVM);
348
349	PDBGFOS const pOldOS = pUVM->dbgf.s.pCurOS;
350	pUVM->dbgf.s.pCurOS = NULL;
351
352	for (PDBGFOS pNewOS = pUVM->dbgf.s.pOSHead; pNewOS; pNewOS = pNewOS->pNext)
353	if (pNewOS->pReg->pfnProbe(pUVM, pNewOS->abData))
354	{
355	int rc;
356	pUVM->dbgf.s.pCurOS = pNewOS;
357	if (pOldOS == pNewOS)
358	rc = pNewOS->pReg->pfnRefresh(pUVM, pNewOS->abData);
359	else
360	{
361	if (pOldOS)
362	pOldOS->pReg->pfnTerm(pUVM, pNewOS->abData);
363	rc = pNewOS->pReg->pfnInit(pUVM, pNewOS->abData);
364	}
365	if (pszName && cchName)
366	strncat(pszName, pNewOS->pReg->szName, cchName);
367
368	DBGF_OS_WRITE_UNLOCK(pUVM);
369	return rc;
370	}
371
372	/* not found */
373	if (pOldOS)
374	pOldOS->pReg->pfnTerm(pUVM, pOldOS->abData);
375
376	DBGF_OS_WRITE_UNLOCK(pUVM);
377	return VINF_DBGF_OS_NOT_DETCTED;
378	}
379
380
381	/**
382	* Detects the guest OS and try dig out symbols and useful stuff.
383	*
384	* When called the 2nd time, symbols will be updated that if the OS
385	* is the same.
386	*
387	* @returns VBox status code.
388	* @retval VINF_SUCCESS if successfully detected.
389	* @retval VINF_DBGF_OS_NOT_DETCTED if we cannot figure it out.
390	*
391	* @param pUVM The user mode VM handle.
392	* @param pszName Where to store the OS name. Empty string if not detected.
393	* @param cchName Size of the buffer.
394	* @thread Any.
395	*/
396	VMMR3DECL(int) DBGFR3OSDetect(PUVM pUVM, char *pszName, size_t cchName)
397	{
398	AssertPtrNullReturn(pszName, VERR_INVALID_POINTER);
399	if (pszName && cchName)
400	*pszName = '\0';
401	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
402
403	/*
404	* Pass it on to EMT(0).
405	*/
406	return VMR3ReqPriorityCallWaitU(pUVM, 0 /idDstCpu/, (PFNRT)dbgfR3OSDetect, 3, pUVM, pszName, cchName);
407	}
408
409
410	/**
411	* EMT worker function for DBGFR3OSQueryNameAndVersion
412	*
413	* @returns VBox status code.
414	* @param pUVM The user mode VM handle.
415	* @param pszName Where to store the OS name. Optional.
416	* @param cchName The size of the name buffer.
417	* @param pszVersion Where to store the version string. Optional.
418	* @param cchVersion The size of the version buffer.
419	*/
420	static DECLCALLBACK(int) dbgfR3OSQueryNameAndVersion(PUVM pUVM, char pszName, size_t cchName, char pszVersion, size_t cchVersion)
421	{
422	/*
423	* Any known OS?
424	*/
425	DBGF_OS_READ_LOCK(pUVM);
426
427	if (pUVM->dbgf.s.pCurOS)
428	{
429	int rc = VINF_SUCCESS;
430	if (pszName && cchName)
431	{
432	size_t cch = strlen(pUVM->dbgf.s.pCurOS->pReg->szName);
433	if (cchName > cch)
434	memcpy(pszName, pUVM->dbgf.s.pCurOS->pReg->szName, cch + 1);
435	else
436	{
437	memcpy(pszName, pUVM->dbgf.s.pCurOS->pReg->szName, cchName - 1);
438	pszName[cchName - 1] = '\0';
439	rc = VINF_BUFFER_OVERFLOW;
440	}
441	}
442
443	if (pszVersion && cchVersion)
444	{
445	int rc2 = pUVM->dbgf.s.pCurOS->pReg->pfnQueryVersion(pUVM, pUVM->dbgf.s.pCurOS->abData, pszVersion, cchVersion);
446	if (RT_FAILURE(rc2) \|\| rc == VINF_SUCCESS)
447	rc = rc2;
448	}
449
450	DBGF_OS_READ_UNLOCK(pUVM);
451	return rc;
452	}
453
454	DBGF_OS_READ_UNLOCK(pUVM);
455	return VERR_DBGF_OS_NOT_DETCTED;
456	}
457
458
459	/**
460	* Queries the name and/or version string for the guest OS.
461	*
462	* It goes without saying that this querying is done using the current
463	* guest OS digger and not additions or user configuration.
464	*
465	* @returns VBox status code.
466	* @param pUVM The user mode VM handle.
467	* @param pszName Where to store the OS name. Optional.
468	* @param cchName The size of the name buffer.
469	* @param pszVersion Where to store the version string. Optional.
470	* @param cchVersion The size of the version buffer.
471	* @thread Any.
472	*/
473	VMMR3DECL(int) DBGFR3OSQueryNameAndVersion(PUVM pUVM, char pszName, size_t cchName, char pszVersion, size_t cchVersion)
474	{
475	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
476	AssertPtrNullReturn(pszName, VERR_INVALID_POINTER);
477	AssertPtrNullReturn(pszVersion, VERR_INVALID_POINTER);
478
479	/*
480	* Initialize the output up front.
481	*/
482	if (pszName && cchName)
483	*pszName = '\0';
484	if (pszVersion && cchVersion)
485	*pszVersion = '\0';
486
487	/*
488	* Pass it on to EMT(0).
489	*/
490	return VMR3ReqPriorityCallWaitU(pUVM, 0 /idDstCpu/,
491	(PFNRT)dbgfR3OSQueryNameAndVersion, 5, pUVM, pszName, cchName, pszVersion, cchVersion);
492	}
493
494
495	/**
496	* @interface_method_impl{DBGFOSIDMESG,pfnQueryKernelLog, Generic EMT wrapper.}
497	*/
498	static DECLCALLBACK(int) dbgfR3OSEmtIDmesg_QueryKernelLog(PDBGFOSIDMESG pThis, PUVM pUVM, uint32_t fFlags, uint32_t cMessages,
499	char pszBuf, size_t cbBuf, size_t pcbActual)
500	{
501	PDBGFOSEMTWRAPPER pWrapper = RT_FROM_MEMBER(pThis, DBGFOSEMTWRAPPER, uWrapper.Dmesg);
502	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
503	AssertReturn(pUVM == pWrapper->pUVM, VERR_INVALID_VM_HANDLE);
504	AssertReturn(!fFlags, VERR_INVALID_FLAGS);
505	AssertReturn(cMessages > 0, VERR_INVALID_PARAMETER);
506	if (cbBuf)
507	AssertPtrReturn(pszBuf, VERR_INVALID_POINTER);
508	AssertPtrNullReturn(pcbActual, VERR_INVALID_POINTER);
509
510	return VMR3ReqPriorityCallWaitU(pWrapper->pUVM, 0 /idDstCpu/,
511	(PFNRT)pWrapper->uDigger.pDmesg->pfnQueryKernelLog, 7,
512	pWrapper->uDigger.pDmesg, pUVM, fFlags, cMessages, pszBuf, cbBuf, pcbActual);
513
514	}
515
516
517	/**
518	* EMT worker for DBGFR3OSQueryInterface.
519	*
520	* @param pUVM The user mode VM handle.
521	* @param enmIf The interface identifier.
522	* @param ppvIf Where to store the interface pointer on success.
523	*/
524	static DECLCALLBACK(void) dbgfR3OSQueryInterface(PUVM pUVM, DBGFOSINTERFACE enmIf, void **ppvIf)
525	{
526	AssertPtrReturnVoid(ppvIf);
527	*ppvIf = NULL;
528	AssertReturnVoid(enmIf > DBGFOSINTERFACE_INVALID && enmIf < DBGFOSINTERFACE_END);
529	UVM_ASSERT_VALID_EXT_RETURN_VOID(pUVM);
530
531	/*
532	* Forward the query to the current OS.
533	*/
534	DBGF_OS_READ_LOCK(pUVM);
535	PDBGFOS pOS = pUVM->dbgf.s.pCurOS;
536	if (pOS)
537	{
538	void *pvDiggerIf;
539	pvDiggerIf = pOS->pReg->pfnQueryInterface(pUVM, pUVM->dbgf.s.pCurOS->abData, enmIf);
540	if (pvDiggerIf)
541	{
542	/*
543	* Do we have an EMT wrapper for this interface already?
544	*
545	* We ASSUME the interfaces are static and not dynamically allocated
546	* for each QueryInterface call.
547	*/
548	PDBGFOSEMTWRAPPER pWrapper = pOS->pWrapperHead;
549	while ( pWrapper != NULL
550	&& ( pWrapper->uDigger.pv != pvDiggerIf
551	&& pWrapper->enmIf != enmIf) )
552	pWrapper = pWrapper->pNext;
553	if (pWrapper)
554	{
555	*ppvIf = &pWrapper->uWrapper;
556	DBGF_OS_READ_UNLOCK(pUVM);
557	return;
558	}
559	DBGF_OS_READ_UNLOCK(pUVM);
560
561	/*
562	* Create a wrapper.
563	*/
564	int rc = MMR3HeapAllocExU(pUVM, MM_TAG_DBGF_OS, sizeof(pWrapper), (void *)&pWrapper);
565	if (RT_FAILURE(rc))
566	return;
567	pWrapper->uDigger.pv = pvDiggerIf;
568	pWrapper->pUVM = pUVM;
569	pWrapper->enmIf = enmIf;
570	switch (enmIf)
571	{
572	case DBGFOSINTERFACE_DMESG:
573	pWrapper->uWrapper.Dmesg.u32Magic = DBGFOSIDMESG_MAGIC;
574	pWrapper->uWrapper.Dmesg.pfnQueryKernelLog = dbgfR3OSEmtIDmesg_QueryKernelLog;
575	pWrapper->uWrapper.Dmesg.u32EndMagic = DBGFOSIDMESG_MAGIC;
576	break;
577	default:
578	AssertFailed();
579	MMR3HeapFree(pWrapper);
580	return;
581	}
582
583	DBGF_OS_WRITE_LOCK(pUVM);
584	if (pUVM->dbgf.s.pCurOS == pOS)
585	{
586	pWrapper->pNext = pOS->pWrapperHead;
587	pOS->pWrapperHead = pWrapper;
588	*ppvIf = &pWrapper->uWrapper;
589	DBGF_OS_WRITE_UNLOCK(pUVM);
590	}
591	else
592	{
593	DBGF_OS_WRITE_UNLOCK(pUVM);
594	MMR3HeapFree(pWrapper);
595	}
596	return;
597	}
598	}
599	DBGF_OS_READ_UNLOCK(pUVM);
600	}
601
602
603	/**
604	* Query an optional digger interface.
605	*
606	* @returns Pointer to the digger interface on success, NULL if the interfaces isn't
607	* available or no active guest OS digger.
608	* @param pUVM The user mode VM handle.
609	* @param enmIf The interface identifier.
610	* @thread Any.
611	*/
612	VMMR3DECL(void *) DBGFR3OSQueryInterface(PUVM pUVM, DBGFOSINTERFACE enmIf)
613	{
614	AssertMsgReturn(enmIf > DBGFOSINTERFACE_INVALID && enmIf < DBGFOSINTERFACE_END, ("%d\n", enmIf), NULL);
615
616	/*
617	* Pass it on to an EMT.
618	*/
619	void *pvIf = NULL;
620	VMR3ReqPriorityCallVoidWaitU(pUVM, VMCPUID_ANY, (PFNRT)dbgfR3OSQueryInterface, 3, pUVM, enmIf, &pvIf);
621	return pvIf;
622	}
623

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source: vbox/trunk/src/VBox/VMM/VMMR3/DBGFOS.cpp@ 71800

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