DBGFMem.cpp@ 19844

Last change on this file since 19844 was 19576, checked in by vboxsync, 16 years ago
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1	/* $Id: DBGFMem.cpp 19576 2009-05-11 12:43:48Z 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	rc = VERR_INVALID_POINTER;
165	}
166	else
167	{
168	/*
169	* Select DBGF worker by addressing mode.
170	*/
171	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
172	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
173	if ( enmMode == PGMMODE_REAL
174	\|\| enmMode == PGMMODE_PROTECTED
175	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
176	rc = PGMPhysSimpleReadGCPhys(pVM, pvBuf, pAddress->FlatPtr, cbRead);
177	else
178	{
179	#if GC_ARCH_BITS > 32
180	if ( ( pAddress->FlatPtr >= _4G
181	\|\| pAddress->FlatPtr + cbRead > _4G)
182	&& enmMode != PGMMODE_AMD64
183	&& enmMode != PGMMODE_AMD64_NX)
184	return VERR_PAGE_TABLE_NOT_PRESENT;
185	#endif
186	rc = PGMPhysSimpleReadGCPtr(pVCpu, pvBuf, pAddress->FlatPtr, cbRead);
187	}
188	}
189	return rc;
190	}
191
192
193	/**
194	* Read guest memory.
195	*
196	* @returns VBox status code.
197	*
198	* @param pVM Pointer to the shared VM structure.
199	* @param idCpu The ID of the source CPU context (for the address).
200	* @param pAddress Where to start reading.
201	* @param pvBuf Where to store the data we've read.
202	* @param cbRead The number of bytes to read.
203	*/
204	VMMR3DECL(int) DBGFR3MemRead(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
205	{
206	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
207	if ((pAddress->fFlags & DBGFADDRESS_FLAGS_TYPE_MASK) == DBGFADDRESS_FLAGS_RING0)
208	{
209	AssertCompile(sizeof(RTHCUINTPTR) <= sizeof(pAddress->FlatPtr));
210	return VMMR3ReadR0Stack(pVM, idCpu, (RTHCUINTPTR)pAddress->FlatPtr, pvBuf, cbRead);
211	}
212	else
213	{
214	PVMREQ pReq;
215	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
216	(PFNRT)dbgfR3MemRead, 5, pVM, idCpu, pAddress, pvBuf, cbRead);
217	if (RT_SUCCESS(rc))
218	rc = pReq->iStatus;
219	VMR3ReqFree(pReq);
220	return rc;
221	}
222	}
223
224
225	/**
226	* Read a zero terminated string from guest memory.
227	*
228	* @returns VBox status code.
229	*
230	* @param pVM Pointer to the shared VM structure.
231	* @param idCpu The ID of the source CPU context (for the address).
232	* @param pAddress Where to start reading.
233	* @param pszBuf Where to store the string.
234	* @param cchBuf The size of the buffer.
235	*/
236	static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
237	{
238	/*
239	* Validate the input we use, PGM does the rest.
240	*/
241	if (!DBGFR3AddrIsValid(pVM, pAddress))
242	return VERR_INVALID_POINTER;
243	if (!VALID_PTR(pszBuf))
244	return VERR_INVALID_POINTER;
245
246	/*
247	* Let dbgfR3MemRead do the job.
248	*/
249	int rc = dbgfR3MemRead(pVM, idCpu, pAddress, pszBuf, cchBuf);
250
251	/*
252	* Make sure the result is terminated and that overflow is signaled.
253	* This may look a bit reckless with the rc but, it should be fine.
254	*/
255	if (!memchr(pszBuf, '\0', cchBuf))
256	{
257	pszBuf[cchBuf - 1] = '\0';
258	rc = VINF_BUFFER_OVERFLOW;
259	}
260	/*
261	* Handle partial reads (not perfect).
262	*/
263	else if (RT_FAILURE(rc))
264	{
265	if (pszBuf[0])
266	rc = VINF_SUCCESS;
267	}
268
269	return rc;
270	}
271
272
273	/**
274	* Read a zero terminated string from guest memory.
275	*
276	* @returns VBox status code.
277	*
278	* @param pVM Pointer to the shared VM structure.
279	* @param idCpu The ID of the source CPU context (for the address).
280	* @param pAddress Where to start reading.
281	* @param pszBuf Where to store the string.
282	* @param cchBuf The size of the buffer.
283	*/
284	VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
285	{
286	/*
287	* Validate and zero output.
288	*/
289	if (!VALID_PTR(pszBuf))
290	return VERR_INVALID_POINTER;
291	if (cchBuf <= 0)
292	return VERR_INVALID_PARAMETER;
293	memset(pszBuf, 0, cchBuf);
294	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
295
296	/*
297	* Pass it on to the EMT.
298	*/
299	PVMREQ pReq;
300	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
301	(PFNRT)dbgfR3MemReadString, 5, pVM, idCpu, pAddress, pszBuf, cchBuf);
302	if (RT_SUCCESS(rc))
303	rc = pReq->iStatus;
304	VMR3ReqFree(pReq);
305
306	return rc;
307	}
308
309
310	/**
311	* Writes guest memory.
312	*
313	* @returns VBox status code.
314	*
315	* @param pVM Pointer to the shared VM structure.
316	* @param idCpu The ID of the target CPU context (for the address).
317	* @param pAddress Where to start writing.
318	* @param pvBuf The data to write.
319	* @param cbRead The number of bytes to write.
320	*/
321	static DECLCALLBACK(int) dbgfR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
322	{
323	/*
324	* Validate the input we use, PGM does the rest.
325	*/
326	if (!DBGFR3AddrIsValid(pVM, pAddress))
327	return VERR_INVALID_POINTER;
328	if (!VALID_PTR(pvBuf))
329	return VERR_INVALID_POINTER;
330
331	/*
332	* HMA is always special.
333	*/
334	int rc;
335	if (DBGFADDRESS_IS_HMA(pAddress))
336	{
337	/** @todo write to HMA. */
338	rc = VERR_ACCESS_DENIED;
339	}
340	else
341	{
342	/*
343	* Select PGM function by addressing mode.
344	*/
345	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
346	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
347	if ( enmMode == PGMMODE_REAL
348	\|\| enmMode == PGMMODE_PROTECTED
349	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
350	rc = PGMPhysSimpleWriteGCPhys(pVM, pAddress->FlatPtr, pvBuf, cbWrite);
351	else
352	{
353	#if GC_ARCH_BITS > 32
354	if ( ( pAddress->FlatPtr >= _4G
355	\|\| pAddress->FlatPtr + cbWrite > _4G)
356	&& enmMode != PGMMODE_AMD64
357	&& enmMode != PGMMODE_AMD64_NX)
358	return VERR_PAGE_TABLE_NOT_PRESENT;
359	#endif
360	rc = PGMPhysSimpleWriteGCPtr(pVCpu, pAddress->FlatPtr, pvBuf, cbWrite);
361	}
362	}
363	return rc;
364	}
365
366
367	/**
368	* Read guest memory.
369	*
370	* @returns VBox status code.
371	*
372	* @param pVM Pointer to the shared VM structure.
373	* @param idCpu The ID of the target CPU context (for the address).
374	* @param pAddress Where to start writing.
375	* @param pvBuf The data to write.
376	* @param cbRead The number of bytes to write.
377	*/
378	VMMR3DECL(int) DBGFR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
379	{
380	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
381
382	PVMREQ pReq;
383	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
384	(PFNRT)dbgfR3MemWrite, 5, pVM, idCpu, pAddress, pvBuf, cbWrite);
385	if (RT_SUCCESS(rc))
386	rc = pReq->iStatus;
387	VMR3ReqFree(pReq);
388
389	return rc;
390	}
391
392
393	/**
394	* Worker for DBGFR3SelQueryInfo that calls into SELM.
395	*/
396	static DECLCALLBACK(int) dbgfR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
397	{
398	/*
399	* Make the query.
400	*/
401	int rc;
402	if (!(fFlags & DBGFSELQI_FLAGS_DT_GUEST))
403	{
404	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
405	VMCPU_ASSERT_EMT(pVCpu);
406	rc = SELMR3GetSelectorInfo(pVM, pVCpu, Sel, pSelInfo);
407	}
408	else
409	{
410	if (HWACCMIsEnabled(pVM))
411	rc = VERR_INVALID_STATE;
412	else
413	rc = SELMR3GetShadowSelectorInfo(pVM, Sel, pSelInfo);
414	}
415	return rc;
416	}
417
418
419	/**
420	* Gets information about a selector.
421	*
422	* Intended for the debugger mostly and will prefer the guest
423	* descriptor tables over the shadow ones.
424	*
425	* @returns VBox status code, the following are the common ones.
426	* @retval VINF_SUCCESS on success.
427	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
428	* descriptor table.
429	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
430	* is not returned if the selector itself isn't present, you have to
431	* check that for yourself (see DBGFSELINFO::fFlags).
432	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
433	* pagetable or page backing the selector table wasn't present.
434	*
435	* @param pVM VM handle.
436	* @param idCpu The ID of the virtual CPU context.
437	* @param Sel The selector to get info about.
438	* @param fFlags Flags, see DBGFQSEL_FLAGS_*.
439	* @param pSelInfo Where to store the information. This will always be
440	* updated.
441	*
442	* @remarks This is a wrapper around SELMR3GetSelectorInfo and
443	* SELMR3GetShadowSelectorInfo.
444	*/
445	VMMR3DECL(int) DBGFR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
446	{
447	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
448	AssertReturn(!(fFlags & ~(DBGFSELQI_FLAGS_DT_GUEST \| DBGFSELQI_FLAGS_DT_SHADOW)), VERR_INVALID_PARAMETER);
449
450	/* Clear the return data here on this thread. */
451	memset(pSelInfo, 0, sizeof(*pSelInfo));
452
453	/*
454	* Dispatch the request to a worker running on the target CPU.
455	*/
456	PVMREQ pReq;
457	int rc = VMR3ReqCallU(pVM->pUVM, idCpu, &pReq, RT_INDEFINITE_WAIT, 0,
458	(PFNRT)dbgfR3SelQueryInfo, 5, pVM, idCpu, Sel, fFlags, pSelInfo);
459	if (RT_SUCCESS(rc))
460	rc = pReq->iStatus;
461	VMR3ReqFree(pReq);
462
463	return rc;
464	}
465
466
467	/**
468	* Validates a CS selector.
469	*
470	* @returns VBox status code.
471	* @param pSelInfo Pointer to the selector information for the CS selector.
472	* @param SelCPL The selector defining the CPL (SS).
473	*/
474	VMMDECL(int) DBGFR3SelInfoValidateCS(PCDBGFSELINFO pSelInfo, RTSEL SelCPL)
475	{
476	/*
477	* Check if present.
478	*/
479	if (pSelInfo->u.Raw.Gen.u1Present)
480	{
481	/*
482	* Type check.
483	*/
484	if ( pSelInfo->u.Raw.Gen.u1DescType == 1
485	&& (pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CODE))
486	{
487	/*
488	* Check level.
489	*/
490	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, pSelInfo->Sel & X86_SEL_RPL);
491	if ( !(pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CONF)
492	? uLevel <= pSelInfo->u.Raw.Gen.u2Dpl
493	: uLevel >= pSelInfo->u.Raw.Gen.u2Dpl /* hope I got this right now... */
494	)
495	return VINF_SUCCESS;
496	return VERR_INVALID_RPL;
497	}
498	return VERR_NOT_CODE_SELECTOR;
499	}
500	return VERR_SELECTOR_NOT_PRESENT;
501	}
502
503

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source: vbox/trunk/src/VBox/VMM/DBGFMem.cpp@ 19844

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