DBGFMem.cpp@ 26616

Last change on this file since 26616 was 26491, checked in by vboxsync, 15 years ago
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1	/* $Id: DBGFMem.cpp 26491 2010-02-14 07:47:12Z 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 puAlign The alignment restriction imposed on the search result.
47	* @param pcbRange The number of bytes to scan. Passed as a pointer because
48	* it may be 64-bit.
49	* @param pabNeedle What to search for - exact search.
50	* @param cbNeedle Size of the search byte string.
51	* @param pHitAddress Where to put the address of the first hit.
52	*/
53	static DECLCALLBACK(int) dbgfR3MemScan(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, PCRTGCUINTPTR pcbRange, RTGCUINTPTR *puAlign,
54	const uint8_t *pabNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
55	{
56	Assert(idCpu == VMMGetCpuId(pVM));
57
58	/*
59	* Validate the input we use, PGM does the rest.
60	*/
61	RTGCUINTPTR cbRange = *pcbRange;
62	if (!DBGFR3AddrIsValid(pVM, pAddress))
63	return VERR_INVALID_POINTER;
64	if (!VALID_PTR(pHitAddress))
65	return VERR_INVALID_POINTER;
66	if (DBGFADDRESS_IS_HMA(pAddress))
67	return VERR_INVALID_POINTER;
68
69	/*
70	* Select DBGF worker by addressing mode.
71	*/
72	int rc;
73	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
74	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
75	if ( enmMode == PGMMODE_REAL
76	\|\| enmMode == PGMMODE_PROTECTED
77	\|\| DBGFADDRESS_IS_PHYS(pAddress)
78	)
79	{
80	RTGCPHYS GCPhysAlign = *puAlign;
81	if (GCPhysAlign != *puAlign)
82	return VERR_OUT_OF_RANGE;
83	RTGCPHYS PhysHit;
84	rc = PGMR3DbgScanPhysical(pVM, pAddress->FlatPtr, cbRange, GCPhysAlign, pabNeedle, cbNeedle, &PhysHit);
85	if (RT_SUCCESS(rc))
86	DBGFR3AddrFromPhys(pVM, pHitAddress, PhysHit);
87	}
88	else
89	{
90	#if GC_ARCH_BITS > 32
91	if ( ( pAddress->FlatPtr >= _4G
92	\|\| pAddress->FlatPtr + cbRange > _4G)
93	&& enmMode != PGMMODE_AMD64
94	&& enmMode != PGMMODE_AMD64_NX)
95	return VERR_DBGF_MEM_NOT_FOUND;
96	#endif
97	RTGCUINTPTR GCPtrHit;
98	rc = PGMR3DbgScanVirtual(pVM, pVCpu, pAddress->FlatPtr, cbRange, *puAlign, pabNeedle, cbNeedle, &GCPtrHit);
99	if (RT_SUCCESS(rc))
100	DBGFR3AddrFromFlat(pVM, pHitAddress, GCPtrHit);
101	}
102
103	return rc;
104	}
105
106
107	/**
108	* Scan guest memory for an exact byte string.
109	*
110	* @returns VBox status codes:
111	* @retval VINF_SUCCESS and *pGCPtrHit on success.
112	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
113	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
114	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
115	*
116	* @param pVM The VM handle.
117	* @param idCpu The ID of the CPU context to search in.
118	* @param pAddress Where to store the mixed address.
119	* @param cbRange The number of bytes to scan.
120	* @param uAlign The alignment restriction imposed on the result.
121	* Usually set to 1.
122	* @param pvNeedle What to search for - exact search.
123	* @param cbNeedle Size of the search byte string.
124	* @param pHitAddress Where to put the address of the first hit.
125	*
126	* @thread Any thread.
127	*/
128	VMMR3DECL(int) DBGFR3MemScan(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, RTGCUINTPTR cbRange, RTGCUINTPTR uAlign,
129	const void *pvNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
130	{
131	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
132	return VMR3ReqCallWait(pVM, idCpu, (PFNRT)dbgfR3MemScan, 8,
133	pVM, idCpu, pAddress, &cbRange, &uAlign, pvNeedle, cbNeedle, pHitAddress);
134
135	}
136
137
138	/**
139	* Read guest memory.
140	*
141	* @returns VBox status code.
142	* @param pVM Pointer to the shared VM structure.
143	* @param pAddress Where to start reading.
144	* @param pvBuf Where to store the data we've read.
145	* @param cbRead The number of bytes to read.
146	*/
147	static DECLCALLBACK(int) dbgfR3MemRead(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
148	{
149	Assert(idCpu == VMMGetCpuId(pVM));
150
151	/*
152	* Validate the input we use, PGM does the rest.
153	*/
154	if (!DBGFR3AddrIsValid(pVM, pAddress))
155	return VERR_INVALID_POINTER;
156	if (!VALID_PTR(pvBuf))
157	return VERR_INVALID_POINTER;
158
159	/*
160	* HMA is special
161	*/
162	int rc;
163	if (DBGFADDRESS_IS_HMA(pAddress))
164	{
165	if (DBGFADDRESS_IS_PHYS(pAddress))
166	rc = VERR_INVALID_POINTER;
167	else
168	rc = MMR3HyperReadGCVirt(pVM, pvBuf, pAddress->FlatPtr, cbRead);
169	}
170	else
171	{
172	/*
173	* Select DBGF worker by addressing mode.
174	*/
175	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
176	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
177	if ( enmMode == PGMMODE_REAL
178	\|\| enmMode == PGMMODE_PROTECTED
179	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
180	rc = PGMPhysSimpleReadGCPhys(pVM, pvBuf, pAddress->FlatPtr, cbRead);
181	else
182	{
183	#if GC_ARCH_BITS > 32
184	if ( ( pAddress->FlatPtr >= _4G
185	\|\| pAddress->FlatPtr + cbRead > _4G)
186	&& enmMode != PGMMODE_AMD64
187	&& enmMode != PGMMODE_AMD64_NX)
188	return VERR_PAGE_TABLE_NOT_PRESENT;
189	#endif
190	rc = PGMPhysSimpleReadGCPtr(pVCpu, pvBuf, pAddress->FlatPtr, cbRead);
191	}
192	}
193	return rc;
194	}
195
196
197	/**
198	* Read guest memory.
199	*
200	* @returns VBox status code.
201	*
202	* @param pVM Pointer to the shared VM structure.
203	* @param idCpu The ID of the source CPU context (for the address).
204	* @param pAddress Where to start reading.
205	* @param pvBuf Where to store the data we've read.
206	* @param cbRead The number of bytes to read.
207	*/
208	VMMR3DECL(int) DBGFR3MemRead(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
209	{
210	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
211	if ((pAddress->fFlags & DBGFADDRESS_FLAGS_TYPE_MASK) == DBGFADDRESS_FLAGS_RING0)
212	{
213	AssertCompile(sizeof(RTHCUINTPTR) <= sizeof(pAddress->FlatPtr));
214	return VMMR3ReadR0Stack(pVM, idCpu, (RTHCUINTPTR)pAddress->FlatPtr, pvBuf, cbRead);
215	}
216	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemRead, 5, pVM, idCpu, pAddress, pvBuf, cbRead);
217	}
218
219
220	/**
221	* Read a zero terminated string from guest memory.
222	*
223	* @returns VBox status code.
224	*
225	* @param pVM Pointer to the shared VM structure.
226	* @param idCpu The ID of the source CPU context (for the address).
227	* @param pAddress Where to start reading.
228	* @param pszBuf Where to store the string.
229	* @param cchBuf The size of the buffer.
230	*/
231	static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
232	{
233	/*
234	* Validate the input we use, PGM does the rest.
235	*/
236	if (!DBGFR3AddrIsValid(pVM, pAddress))
237	return VERR_INVALID_POINTER;
238	if (!VALID_PTR(pszBuf))
239	return VERR_INVALID_POINTER;
240
241	/*
242	* Let dbgfR3MemRead do the job.
243	*/
244	int rc = dbgfR3MemRead(pVM, idCpu, pAddress, pszBuf, cchBuf);
245
246	/*
247	* Make sure the result is terminated and that overflow is signaled.
248	* This may look a bit reckless with the rc but, it should be fine.
249	*/
250	if (!memchr(pszBuf, '\0', cchBuf))
251	{
252	pszBuf[cchBuf - 1] = '\0';
253	rc = VINF_BUFFER_OVERFLOW;
254	}
255	/*
256	* Handle partial reads (not perfect).
257	*/
258	else if (RT_FAILURE(rc))
259	{
260	if (pszBuf[0])
261	rc = VINF_SUCCESS;
262	}
263
264	return rc;
265	}
266
267
268	/**
269	* Read a zero terminated string from guest memory.
270	*
271	* @returns VBox status code.
272	*
273	* @param pVM Pointer to the shared VM structure.
274	* @param idCpu The ID of the source CPU context (for the address).
275	* @param pAddress Where to start reading.
276	* @param pszBuf Where to store the string.
277	* @param cchBuf The size of the buffer.
278	*/
279	VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
280	{
281	/*
282	* Validate and zero output.
283	*/
284	if (!VALID_PTR(pszBuf))
285	return VERR_INVALID_POINTER;
286	if (cchBuf <= 0)
287	return VERR_INVALID_PARAMETER;
288	memset(pszBuf, 0, cchBuf);
289	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
290
291	/*
292	* Pass it on to the EMT.
293	*/
294	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemReadString, 5, pVM, idCpu, pAddress, pszBuf, cchBuf);
295	}
296
297
298	/**
299	* Writes guest memory.
300	*
301	* @returns VBox status code.
302	*
303	* @param pVM Pointer to the shared VM structure.
304	* @param idCpu The ID of the target CPU context (for the address).
305	* @param pAddress Where to start writing.
306	* @param pvBuf The data to write.
307	* @param cbWrite The number of bytes to write.
308	*/
309	static DECLCALLBACK(int) dbgfR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
310	{
311	/*
312	* Validate the input we use, PGM does the rest.
313	*/
314	if (!DBGFR3AddrIsValid(pVM, pAddress))
315	return VERR_INVALID_POINTER;
316	if (!VALID_PTR(pvBuf))
317	return VERR_INVALID_POINTER;
318
319	/*
320	* HMA is always special.
321	*/
322	int rc;
323	if (DBGFADDRESS_IS_HMA(pAddress))
324	{
325	/** @todo write to HMA. */
326	rc = VERR_ACCESS_DENIED;
327	}
328	else
329	{
330	/*
331	* Select PGM function by addressing mode.
332	*/
333	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
334	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
335	if ( enmMode == PGMMODE_REAL
336	\|\| enmMode == PGMMODE_PROTECTED
337	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
338	rc = PGMPhysSimpleWriteGCPhys(pVM, pAddress->FlatPtr, pvBuf, cbWrite);
339	else
340	{
341	#if GC_ARCH_BITS > 32
342	if ( ( pAddress->FlatPtr >= _4G
343	\|\| pAddress->FlatPtr + cbWrite > _4G)
344	&& enmMode != PGMMODE_AMD64
345	&& enmMode != PGMMODE_AMD64_NX)
346	return VERR_PAGE_TABLE_NOT_PRESENT;
347	#endif
348	rc = PGMPhysSimpleWriteGCPtr(pVCpu, pAddress->FlatPtr, pvBuf, cbWrite);
349	}
350	}
351	return rc;
352	}
353
354
355	/**
356	* Read guest memory.
357	*
358	* @returns VBox status code.
359	*
360	* @param pVM Pointer to the shared VM structure.
361	* @param idCpu The ID of the target CPU context (for the address).
362	* @param pAddress Where to start writing.
363	* @param pvBuf The data to write.
364	* @param cbRead The number of bytes to write.
365	*/
366	VMMR3DECL(int) DBGFR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
367	{
368	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
369	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemWrite, 5, pVM, idCpu, pAddress, pvBuf, cbWrite);
370	}
371
372
373	/**
374	* Worker for DBGFR3SelQueryInfo that calls into SELM.
375	*/
376	static DECLCALLBACK(int) dbgfR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
377	{
378	/*
379	* Make the query.
380	*/
381	int rc;
382	if (!(fFlags & DBGFSELQI_FLAGS_DT_SHADOW))
383	{
384	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
385	VMCPU_ASSERT_EMT(pVCpu);
386	rc = SELMR3GetSelectorInfo(pVM, pVCpu, Sel, pSelInfo);
387
388	/*
389	* 64-bit mode HACKS for making data and stack selectors wide open when
390	* queried. This is voodoo magic.
391	*/
392	if (fFlags & DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE)
393	{
394	/* Expand 64-bit data and stack selectors. The check is a bit bogus... */
395	if ( RT_SUCCESS(rc)
396	&& (pSelInfo->fFlags & ( DBGFSELINFO_FLAGS_LONG_MODE \| DBGFSELINFO_FLAGS_REAL_MODE \| DBGFSELINFO_FLAGS_PROT_MODE
397	\| DBGFSELINFO_FLAGS_GATE \| DBGFSELINFO_FLAGS_HYPER
398	\| DBGFSELINFO_FLAGS_INVALID \| DBGFSELINFO_FLAGS_NOT_PRESENT))
399	== DBGFSELINFO_FLAGS_LONG_MODE
400	&& pSelInfo->cbLimit != ~(RTGCPTR)0
401	&& CPUMIsGuestIn64BitCode(pVCpu, CPUMGetGuestCtxCore(pVCpu)) )
402	{
403	pSelInfo->GCPtrBase = 0;
404	pSelInfo->cbLimit = ~(RTGCPTR)0;
405	}
406	else if ( Sel == 0
407	&& CPUMIsGuestIn64BitCode(pVCpu, CPUMGetGuestCtxCore(pVCpu)))
408	{
409	pSelInfo->GCPtrBase = 0;
410	pSelInfo->cbLimit = ~(RTGCPTR)0;
411	pSelInfo->Sel = 0;
412	pSelInfo->SelGate = 0;
413	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
414	pSelInfo->u.Raw64.Gen.u1Present = 1;
415	pSelInfo->u.Raw64.Gen.u1Long = 1;
416	pSelInfo->u.Raw64.Gen.u1DescType = 1;
417	rc = VINF_SUCCESS;
418	}
419	}
420	}
421	else
422	{
423	if (HWACCMIsEnabled(pVM))
424	rc = VERR_INVALID_STATE;
425	else
426	rc = SELMR3GetShadowSelectorInfo(pVM, Sel, pSelInfo);
427	}
428	return rc;
429	}
430
431
432	/**
433	* Gets information about a selector.
434	*
435	* Intended for the debugger mostly and will prefer the guest
436	* descriptor tables over the shadow ones.
437	*
438	* @returns VBox status code, the following are the common ones.
439	* @retval VINF_SUCCESS on success.
440	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
441	* descriptor table.
442	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
443	* is not returned if the selector itself isn't present, you have to
444	* check that for yourself (see DBGFSELINFO::fFlags).
445	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
446	* pagetable or page backing the selector table wasn't present.
447	*
448	* @param pVM VM handle.
449	* @param idCpu The ID of the virtual CPU context.
450	* @param Sel The selector to get info about.
451	* @param fFlags Flags, see DBGFQSEL_FLAGS_*.
452	* @param pSelInfo Where to store the information. This will always be
453	* updated.
454	*
455	* @remarks This is a wrapper around SELMR3GetSelectorInfo and
456	* SELMR3GetShadowSelectorInfo.
457	*/
458	VMMR3DECL(int) DBGFR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
459	{
460	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
461	AssertReturn(!(fFlags & ~(DBGFSELQI_FLAGS_DT_GUEST \| DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE)), VERR_INVALID_PARAMETER);
462	AssertReturn( (fFlags & (DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE))
463	!= (DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE), VERR_INVALID_PARAMETER);
464
465	/* Clear the return data here on this thread. */
466	memset(pSelInfo, 0, sizeof(*pSelInfo));
467
468	/*
469	* Dispatch the request to a worker running on the target CPU.
470	*/
471	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3SelQueryInfo, 5, pVM, idCpu, Sel, fFlags, pSelInfo);
472	}
473
474
475	/**
476	* Validates a CS selector.
477	*
478	* @returns VBox status code.
479	* @param pSelInfo Pointer to the selector information for the CS selector.
480	* @param SelCPL The selector defining the CPL (SS).
481	*/
482	VMMDECL(int) DBGFR3SelInfoValidateCS(PCDBGFSELINFO pSelInfo, RTSEL SelCPL)
483	{
484	/*
485	* Check if present.
486	*/
487	if (pSelInfo->u.Raw.Gen.u1Present)
488	{
489	/*
490	* Type check.
491	*/
492	if ( pSelInfo->u.Raw.Gen.u1DescType == 1
493	&& (pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CODE))
494	{
495	/*
496	* Check level.
497	*/
498	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, pSelInfo->Sel & X86_SEL_RPL);
499	if ( !(pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CONF)
500	? uLevel <= pSelInfo->u.Raw.Gen.u2Dpl
501	: uLevel >= pSelInfo->u.Raw.Gen.u2Dpl /* hope I got this right now... */
502	)
503	return VINF_SUCCESS;
504	return VERR_INVALID_RPL;
505	}
506	return VERR_NOT_CODE_SELECTOR;
507	}
508	return VERR_SELECTOR_NOT_PRESENT;
509	}
510

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source: vbox/trunk/src/VBox/VMM/DBGFMem.cpp@ 26616

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