DBGFMem.cpp@ 21987

Last change on this file since 21987 was 20868, checked in by vboxsync, 15 years ago
DBGFR3MemRead: Support for reading HMA by virtual address.
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File size: 15.9 KB

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1	/* $Id: DBGFMem.cpp 20868 2009-06-24 00:10:55Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Memory Methods.
4	*/
5
6	/*
7	* Copyright (C) 2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_DBGF
27	#include <VBox/dbgf.h>
28	#include <VBox/pgm.h>
29	#include <VBox/selm.h>
30	#include <VBox/hwaccm.h>
31	#include "DBGFInternal.h"
32	#include <VBox/vm.h>
33	#include <VBox/err.h>
34	#include <VBox/log.h>
35	#include <VBox/mm.h>
36
37
38
39	/**
40	* Scan guest memory for an exact byte string.
41	*
42	* @returns VBox status code.
43	* @param pVM The VM handle.
44	* @param idCpu The ID of the CPU context to search in.
45	* @param pAddress Where to store the mixed address.
46	* @param pcbRange The number of bytes to scan. Passed as a pointer because
47	* it may be 64-bit.
48	* @param pabNeedle What to search for - exact search.
49	* @param cbNeedle Size of the search byte string.
50	* @param pHitAddress Where to put the address of the first hit.
51	*/
52	static DECLCALLBACK(int) dbgfR3MemScan(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, PCRTGCUINTPTR pcbRange,
53	const uint8_t *pabNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
54	{
55	Assert(idCpu == VMMGetCpuId(pVM));
56
57	/*
58	* Validate the input we use, PGM does the rest.
59	*/
60	RTGCUINTPTR cbRange = *pcbRange;
61	if (!DBGFR3AddrIsValid(pVM, pAddress))
62	return VERR_INVALID_POINTER;
63	if (!VALID_PTR(pHitAddress))
64	return VERR_INVALID_POINTER;
65	if (DBGFADDRESS_IS_HMA(pAddress))
66	return VERR_INVALID_POINTER;
67
68	/*
69	* Select DBGF worker by addressing mode.
70	*/
71	int rc;
72	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
73	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
74	if ( enmMode == PGMMODE_REAL
75	\|\| enmMode == PGMMODE_PROTECTED
76	\|\| DBGFADDRESS_IS_PHYS(pAddress)
77	)
78	{
79	RTGCPHYS PhysHit;
80	rc = PGMR3DbgScanPhysical(pVM, pAddress->FlatPtr, cbRange, pabNeedle, cbNeedle, &PhysHit);
81	if (RT_SUCCESS(rc))
82	DBGFR3AddrFromPhys(pVM, pHitAddress, PhysHit);
83	}
84	else
85	{
86	#if GC_ARCH_BITS > 32
87	if ( ( pAddress->FlatPtr >= _4G
88	\|\| pAddress->FlatPtr + cbRange > _4G)
89	&& enmMode != PGMMODE_AMD64
90	&& enmMode != PGMMODE_AMD64_NX)
91	return VERR_DBGF_MEM_NOT_FOUND;
92	#endif
93	RTGCUINTPTR GCPtrHit;
94	rc = PGMR3DbgScanVirtual(pVM, pVCpu, pAddress->FlatPtr, cbRange, pabNeedle, cbNeedle, &GCPtrHit);
95	if (RT_SUCCESS(rc))
96	DBGFR3AddrFromFlat(pVM, pHitAddress, GCPtrHit);
97	}
98
99	return rc;
100	}
101
102
103	/**
104	* Scan guest memory for an exact byte string.
105	*
106	* @returns VBox status codes:
107	* @retval VINF_SUCCESS and *pGCPtrHit on success.
108	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
109	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
110	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
111	*
112	* @param pVM The VM handle.
113	* @param idCpu The ID of the CPU context to search in.
114	* @param pAddress Where to store the mixed address.
115	* @param cbRange The number of bytes to scan.
116	* @param pabNeedle What to search for - exact search.
117	* @param cbNeedle Size of the search byte string.
118	* @param pHitAddress Where to put the address of the first hit.
119	*
120	* @thread Any thread.
121	*/
122	VMMR3DECL(int) DBGFR3MemScan(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, RTGCUINTPTR cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
123	{
124	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
125
126	PVMREQ pReq;
127	int rc = VMR3ReqCall(pVM, idCpu, &pReq, RT_INDEFINITE_WAIT,
128	(PFNRT)dbgfR3MemScan, 7, pVM, idCpu, pAddress, &cbRange, pabNeedle, cbNeedle, pHitAddress);
129	if (RT_SUCCESS(rc))
130	rc = pReq->iStatus;
131	VMR3ReqFree(pReq);
132
133	return rc;
134	}
135
136
137	/**
138	* Read guest memory.
139	*
140	* @returns VBox status code.
141	* @param pVM Pointer to the shared VM structure.
142	* @param pAddress Where to start reading.
143	* @param pvBuf Where to store the data we've read.
144	* @param cbRead The number of bytes to read.
145	*/
146	static DECLCALLBACK(int) dbgfR3MemRead(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
147	{
148	Assert(idCpu == VMMGetCpuId(pVM));
149
150	/*
151	* Validate the input we use, PGM does the rest.
152	*/
153	if (!DBGFR3AddrIsValid(pVM, pAddress))
154	return VERR_INVALID_POINTER;
155	if (!VALID_PTR(pvBuf))
156	return VERR_INVALID_POINTER;
157
158	/*
159	* HMA is special
160	*/
161	int rc;
162	if (DBGFADDRESS_IS_HMA(pAddress))
163	{
164	if (DBGFADDRESS_IS_PHYS(pAddress))
165	rc = VERR_INVALID_POINTER;
166	else
167	rc = MMR3HyperReadGCVirt(pVM, pvBuf, pAddress->FlatPtr, cbRead);
168	}
169	else
170	{
171	/*
172	* Select DBGF worker by addressing mode.
173	*/
174	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
175	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
176	if ( enmMode == PGMMODE_REAL
177	\|\| enmMode == PGMMODE_PROTECTED
178	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
179	rc = PGMPhysSimpleReadGCPhys(pVM, pvBuf, pAddress->FlatPtr, cbRead);
180	else
181	{
182	#if GC_ARCH_BITS > 32
183	if ( ( pAddress->FlatPtr >= _4G
184	\|\| pAddress->FlatPtr + cbRead > _4G)
185	&& enmMode != PGMMODE_AMD64
186	&& enmMode != PGMMODE_AMD64_NX)
187	return VERR_PAGE_TABLE_NOT_PRESENT;
188	#endif
189	rc = PGMPhysSimpleReadGCPtr(pVCpu, pvBuf, pAddress->FlatPtr, cbRead);
190	}
191	}
192	return rc;
193	}
194
195
196	/**
197	* Read guest memory.
198	*
199	* @returns VBox status code.
200	*
201	* @param pVM Pointer to the shared VM structure.
202	* @param idCpu The ID of the source CPU context (for the address).
203	* @param pAddress Where to start reading.
204	* @param pvBuf Where to store the data we've read.
205	* @param cbRead The number of bytes to read.
206	*/
207	VMMR3DECL(int) DBGFR3MemRead(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
208	{
209	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
210	if ((pAddress->fFlags & DBGFADDRESS_FLAGS_TYPE_MASK) == DBGFADDRESS_FLAGS_RING0)
211	{
212	AssertCompile(sizeof(RTHCUINTPTR) <= sizeof(pAddress->FlatPtr));
213	return VMMR3ReadR0Stack(pVM, idCpu, (RTHCUINTPTR)pAddress->FlatPtr, pvBuf, cbRead);
214	}
215	else
216	{
217	PVMREQ pReq;
218	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
219	(PFNRT)dbgfR3MemRead, 5, pVM, idCpu, pAddress, pvBuf, cbRead);
220	if (RT_SUCCESS(rc))
221	rc = pReq->iStatus;
222	VMR3ReqFree(pReq);
223	return rc;
224	}
225	}
226
227
228	/**
229	* Read a zero terminated string from guest memory.
230	*
231	* @returns VBox status code.
232	*
233	* @param pVM Pointer to the shared VM structure.
234	* @param idCpu The ID of the source CPU context (for the address).
235	* @param pAddress Where to start reading.
236	* @param pszBuf Where to store the string.
237	* @param cchBuf The size of the buffer.
238	*/
239	static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
240	{
241	/*
242	* Validate the input we use, PGM does the rest.
243	*/
244	if (!DBGFR3AddrIsValid(pVM, pAddress))
245	return VERR_INVALID_POINTER;
246	if (!VALID_PTR(pszBuf))
247	return VERR_INVALID_POINTER;
248
249	/*
250	* Let dbgfR3MemRead do the job.
251	*/
252	int rc = dbgfR3MemRead(pVM, idCpu, pAddress, pszBuf, cchBuf);
253
254	/*
255	* Make sure the result is terminated and that overflow is signaled.
256	* This may look a bit reckless with the rc but, it should be fine.
257	*/
258	if (!memchr(pszBuf, '\0', cchBuf))
259	{
260	pszBuf[cchBuf - 1] = '\0';
261	rc = VINF_BUFFER_OVERFLOW;
262	}
263	/*
264	* Handle partial reads (not perfect).
265	*/
266	else if (RT_FAILURE(rc))
267	{
268	if (pszBuf[0])
269	rc = VINF_SUCCESS;
270	}
271
272	return rc;
273	}
274
275
276	/**
277	* Read a zero terminated string from guest memory.
278	*
279	* @returns VBox status code.
280	*
281	* @param pVM Pointer to the shared VM structure.
282	* @param idCpu The ID of the source CPU context (for the address).
283	* @param pAddress Where to start reading.
284	* @param pszBuf Where to store the string.
285	* @param cchBuf The size of the buffer.
286	*/
287	VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
288	{
289	/*
290	* Validate and zero output.
291	*/
292	if (!VALID_PTR(pszBuf))
293	return VERR_INVALID_POINTER;
294	if (cchBuf <= 0)
295	return VERR_INVALID_PARAMETER;
296	memset(pszBuf, 0, cchBuf);
297	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
298
299	/*
300	* Pass it on to the EMT.
301	*/
302	PVMREQ pReq;
303	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
304	(PFNRT)dbgfR3MemReadString, 5, pVM, idCpu, pAddress, pszBuf, cchBuf);
305	if (RT_SUCCESS(rc))
306	rc = pReq->iStatus;
307	VMR3ReqFree(pReq);
308
309	return rc;
310	}
311
312
313	/**
314	* Writes guest memory.
315	*
316	* @returns VBox status code.
317	*
318	* @param pVM Pointer to the shared VM structure.
319	* @param idCpu The ID of the target CPU context (for the address).
320	* @param pAddress Where to start writing.
321	* @param pvBuf The data to write.
322	* @param cbRead The number of bytes to write.
323	*/
324	static DECLCALLBACK(int) dbgfR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
325	{
326	/*
327	* Validate the input we use, PGM does the rest.
328	*/
329	if (!DBGFR3AddrIsValid(pVM, pAddress))
330	return VERR_INVALID_POINTER;
331	if (!VALID_PTR(pvBuf))
332	return VERR_INVALID_POINTER;
333
334	/*
335	* HMA is always special.
336	*/
337	int rc;
338	if (DBGFADDRESS_IS_HMA(pAddress))
339	{
340	/** @todo write to HMA. */
341	rc = VERR_ACCESS_DENIED;
342	}
343	else
344	{
345	/*
346	* Select PGM function by addressing mode.
347	*/
348	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
349	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
350	if ( enmMode == PGMMODE_REAL
351	\|\| enmMode == PGMMODE_PROTECTED
352	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
353	rc = PGMPhysSimpleWriteGCPhys(pVM, pAddress->FlatPtr, pvBuf, cbWrite);
354	else
355	{
356	#if GC_ARCH_BITS > 32
357	if ( ( pAddress->FlatPtr >= _4G
358	\|\| pAddress->FlatPtr + cbWrite > _4G)
359	&& enmMode != PGMMODE_AMD64
360	&& enmMode != PGMMODE_AMD64_NX)
361	return VERR_PAGE_TABLE_NOT_PRESENT;
362	#endif
363	rc = PGMPhysSimpleWriteGCPtr(pVCpu, pAddress->FlatPtr, pvBuf, cbWrite);
364	}
365	}
366	return rc;
367	}
368
369
370	/**
371	* Read guest memory.
372	*
373	* @returns VBox status code.
374	*
375	* @param pVM Pointer to the shared VM structure.
376	* @param idCpu The ID of the target CPU context (for the address).
377	* @param pAddress Where to start writing.
378	* @param pvBuf The data to write.
379	* @param cbRead The number of bytes to write.
380	*/
381	VMMR3DECL(int) DBGFR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
382	{
383	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
384
385	PVMREQ pReq;
386	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
387	(PFNRT)dbgfR3MemWrite, 5, pVM, idCpu, pAddress, pvBuf, cbWrite);
388	if (RT_SUCCESS(rc))
389	rc = pReq->iStatus;
390	VMR3ReqFree(pReq);
391
392	return rc;
393	}
394
395
396	/**
397	* Worker for DBGFR3SelQueryInfo that calls into SELM.
398	*/
399	static DECLCALLBACK(int) dbgfR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
400	{
401	/*
402	* Make the query.
403	*/
404	int rc;
405	if (!(fFlags & DBGFSELQI_FLAGS_DT_GUEST))
406	{
407	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
408	VMCPU_ASSERT_EMT(pVCpu);
409	rc = SELMR3GetSelectorInfo(pVM, pVCpu, Sel, pSelInfo);
410	}
411	else
412	{
413	if (HWACCMIsEnabled(pVM))
414	rc = VERR_INVALID_STATE;
415	else
416	rc = SELMR3GetShadowSelectorInfo(pVM, Sel, pSelInfo);
417	}
418	return rc;
419	}
420
421
422	/**
423	* Gets information about a selector.
424	*
425	* Intended for the debugger mostly and will prefer the guest
426	* descriptor tables over the shadow ones.
427	*
428	* @returns VBox status code, the following are the common ones.
429	* @retval VINF_SUCCESS on success.
430	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
431	* descriptor table.
432	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
433	* is not returned if the selector itself isn't present, you have to
434	* check that for yourself (see DBGFSELINFO::fFlags).
435	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
436	* pagetable or page backing the selector table wasn't present.
437	*
438	* @param pVM VM handle.
439	* @param idCpu The ID of the virtual CPU context.
440	* @param Sel The selector to get info about.
441	* @param fFlags Flags, see DBGFQSEL_FLAGS_*.
442	* @param pSelInfo Where to store the information. This will always be
443	* updated.
444	*
445	* @remarks This is a wrapper around SELMR3GetSelectorInfo and
446	* SELMR3GetShadowSelectorInfo.
447	*/
448	VMMR3DECL(int) DBGFR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
449	{
450	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
451	AssertReturn(!(fFlags & ~(DBGFSELQI_FLAGS_DT_GUEST \| DBGFSELQI_FLAGS_DT_SHADOW)), VERR_INVALID_PARAMETER);
452
453	/* Clear the return data here on this thread. */
454	memset(pSelInfo, 0, sizeof(*pSelInfo));
455
456	/*
457	* Dispatch the request to a worker running on the target CPU.
458	*/
459	PVMREQ pReq;
460	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
461	(PFNRT)dbgfR3SelQueryInfo, 5, pVM, idCpu, Sel, fFlags, pSelInfo);
462	if (RT_SUCCESS(rc))
463	rc = pReq->iStatus;
464	VMR3ReqFree(pReq);
465
466	return rc;
467	}
468
469
470	/**
471	* Validates a CS selector.
472	*
473	* @returns VBox status code.
474	* @param pSelInfo Pointer to the selector information for the CS selector.
475	* @param SelCPL The selector defining the CPL (SS).
476	*/
477	VMMDECL(int) DBGFR3SelInfoValidateCS(PCDBGFSELINFO pSelInfo, RTSEL SelCPL)
478	{
479	/*
480	* Check if present.
481	*/
482	if (pSelInfo->u.Raw.Gen.u1Present)
483	{
484	/*
485	* Type check.
486	*/
487	if ( pSelInfo->u.Raw.Gen.u1DescType == 1
488	&& (pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CODE))
489	{
490	/*
491	* Check level.
492	*/
493	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, pSelInfo->Sel & X86_SEL_RPL);
494	if ( !(pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CONF)
495	? uLevel <= pSelInfo->u.Raw.Gen.u2Dpl
496	: uLevel >= pSelInfo->u.Raw.Gen.u2Dpl /* hope I got this right now... */
497	)
498	return VINF_SUCCESS;
499	return VERR_INVALID_RPL;
500	}
501	return VERR_NOT_CODE_SELECTOR;
502	}
503	return VERR_SELECTOR_NOT_PRESENT;
504	}
505
506

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source: vbox/trunk/src/VBox/VMM/DBGFMem.cpp@ 21987

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