DBGFMem.cpp@ 23011

最後變更在這個檔案從23011是 23011,由 vboxsync 提交於 16 年前
VMM,VMMDev: Some VMMR3ReqCall refactoring.
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1	/* $Id: DBGFMem.cpp 23011 2009-09-14 15:57:38Z 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.alldomusa.eu.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	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemRead, 5, pVM, idCpu, pAddress, pvBuf, cbRead);
216	}
217
218
219	/**
220	* Read a zero terminated string from guest memory.
221	*
222	* @returns VBox status code.
223	*
224	* @param pVM Pointer to the shared VM structure.
225	* @param idCpu The ID of the source CPU context (for the address).
226	* @param pAddress Where to start reading.
227	* @param pszBuf Where to store the string.
228	* @param cchBuf The size of the buffer.
229	*/
230	static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
231	{
232	/*
233	* Validate the input we use, PGM does the rest.
234	*/
235	if (!DBGFR3AddrIsValid(pVM, pAddress))
236	return VERR_INVALID_POINTER;
237	if (!VALID_PTR(pszBuf))
238	return VERR_INVALID_POINTER;
239
240	/*
241	* Let dbgfR3MemRead do the job.
242	*/
243	int rc = dbgfR3MemRead(pVM, idCpu, pAddress, pszBuf, cchBuf);
244
245	/*
246	* Make sure the result is terminated and that overflow is signaled.
247	* This may look a bit reckless with the rc but, it should be fine.
248	*/
249	if (!memchr(pszBuf, '\0', cchBuf))
250	{
251	pszBuf[cchBuf - 1] = '\0';
252	rc = VINF_BUFFER_OVERFLOW;
253	}
254	/*
255	* Handle partial reads (not perfect).
256	*/
257	else if (RT_FAILURE(rc))
258	{
259	if (pszBuf[0])
260	rc = VINF_SUCCESS;
261	}
262
263	return rc;
264	}
265
266
267	/**
268	* Read a zero terminated string from guest memory.
269	*
270	* @returns VBox status code.
271	*
272	* @param pVM Pointer to the shared VM structure.
273	* @param idCpu The ID of the source CPU context (for the address).
274	* @param pAddress Where to start reading.
275	* @param pszBuf Where to store the string.
276	* @param cchBuf The size of the buffer.
277	*/
278	VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
279	{
280	/*
281	* Validate and zero output.
282	*/
283	if (!VALID_PTR(pszBuf))
284	return VERR_INVALID_POINTER;
285	if (cchBuf <= 0)
286	return VERR_INVALID_PARAMETER;
287	memset(pszBuf, 0, cchBuf);
288	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
289
290	/*
291	* Pass it on to the EMT.
292	*/
293	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemReadString, 5, pVM, idCpu, pAddress, pszBuf, cchBuf);
294	}
295
296
297	/**
298	* Writes guest memory.
299	*
300	* @returns VBox status code.
301	*
302	* @param pVM Pointer to the shared VM structure.
303	* @param idCpu The ID of the target CPU context (for the address).
304	* @param pAddress Where to start writing.
305	* @param pvBuf The data to write.
306	* @param cbRead The number of bytes to write.
307	*/
308	static DECLCALLBACK(int) dbgfR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
309	{
310	/*
311	* Validate the input we use, PGM does the rest.
312	*/
313	if (!DBGFR3AddrIsValid(pVM, pAddress))
314	return VERR_INVALID_POINTER;
315	if (!VALID_PTR(pvBuf))
316	return VERR_INVALID_POINTER;
317
318	/*
319	* HMA is always special.
320	*/
321	int rc;
322	if (DBGFADDRESS_IS_HMA(pAddress))
323	{
324	/** @todo write to HMA. */
325	rc = VERR_ACCESS_DENIED;
326	}
327	else
328	{
329	/*
330	* Select PGM function by addressing mode.
331	*/
332	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
333	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
334	if ( enmMode == PGMMODE_REAL
335	\|\| enmMode == PGMMODE_PROTECTED
336	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
337	rc = PGMPhysSimpleWriteGCPhys(pVM, pAddress->FlatPtr, pvBuf, cbWrite);
338	else
339	{
340	#if GC_ARCH_BITS > 32
341	if ( ( pAddress->FlatPtr >= _4G
342	\|\| pAddress->FlatPtr + cbWrite > _4G)
343	&& enmMode != PGMMODE_AMD64
344	&& enmMode != PGMMODE_AMD64_NX)
345	return VERR_PAGE_TABLE_NOT_PRESENT;
346	#endif
347	rc = PGMPhysSimpleWriteGCPtr(pVCpu, pAddress->FlatPtr, pvBuf, cbWrite);
348	}
349	}
350	return rc;
351	}
352
353
354	/**
355	* Read guest memory.
356	*
357	* @returns VBox status code.
358	*
359	* @param pVM Pointer to the shared VM structure.
360	* @param idCpu The ID of the target CPU context (for the address).
361	* @param pAddress Where to start writing.
362	* @param pvBuf The data to write.
363	* @param cbRead The number of bytes to write.
364	*/
365	VMMR3DECL(int) DBGFR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
366	{
367	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
368	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemWrite, 5, pVM, idCpu, pAddress, pvBuf, cbWrite);
369	}
370
371
372	/**
373	* Worker for DBGFR3SelQueryInfo that calls into SELM.
374	*/
375	static DECLCALLBACK(int) dbgfR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
376	{
377	/*
378	* Make the query.
379	*/
380	int rc;
381	if (!(fFlags & DBGFSELQI_FLAGS_DT_SHADOW))
382	{
383	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
384	VMCPU_ASSERT_EMT(pVCpu);
385	rc = SELMR3GetSelectorInfo(pVM, pVCpu, Sel, pSelInfo);
386
387	/*
388	* 64-bit mode HACKS for making data and stack selectors wide open when
389	* queried. This is voodoo magic.
390	*/
391	if (fFlags & DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE)
392	{
393	/* Expand 64-bit data and stack selectors. The check is a bit bogus... */
394	if ( RT_SUCCESS(rc)
395	&& (pSelInfo->fFlags & ( DBGFSELINFO_FLAGS_LONG_MODE \| DBGFSELINFO_FLAGS_REAL_MODE \| DBGFSELINFO_FLAGS_PROT_MODE
396	\| DBGFSELINFO_FLAGS_GATE \| DBGFSELINFO_FLAGS_HYPER
397	\| DBGFSELINFO_FLAGS_INVALID \| DBGFSELINFO_FLAGS_NOT_PRESENT))
398	== DBGFSELINFO_FLAGS_LONG_MODE
399	&& pSelInfo->cbLimit != ~(RTGCPTR)0
400	&& CPUMIsGuestIn64BitCode(pVCpu, CPUMGetGuestCtxCore(pVCpu)) )
401	{
402	pSelInfo->GCPtrBase = 0;
403	pSelInfo->cbLimit = ~(RTGCPTR)0;
404	}
405	else if ( Sel == 0
406	&& CPUMIsGuestIn64BitCode(pVCpu, CPUMGetGuestCtxCore(pVCpu)))
407	{
408	pSelInfo->GCPtrBase = 0;
409	pSelInfo->cbLimit = ~(RTGCPTR)0;
410	pSelInfo->Sel = 0;
411	pSelInfo->SelGate = 0;
412	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
413	pSelInfo->u.Raw64.Gen.u1Present = 1;
414	pSelInfo->u.Raw64.Gen.u1Long = 1;
415	pSelInfo->u.Raw64.Gen.u1DescType = 1;
416	rc = VINF_SUCCESS;
417	}
418	}
419	}
420	else
421	{
422	if (HWACCMIsEnabled(pVM))
423	rc = VERR_INVALID_STATE;
424	else
425	rc = SELMR3GetShadowSelectorInfo(pVM, Sel, pSelInfo);
426	}
427	return rc;
428	}
429
430
431	/**
432	* Gets information about a selector.
433	*
434	* Intended for the debugger mostly and will prefer the guest
435	* descriptor tables over the shadow ones.
436	*
437	* @returns VBox status code, the following are the common ones.
438	* @retval VINF_SUCCESS on success.
439	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
440	* descriptor table.
441	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
442	* is not returned if the selector itself isn't present, you have to
443	* check that for yourself (see DBGFSELINFO::fFlags).
444	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
445	* pagetable or page backing the selector table wasn't present.
446	*
447	* @param pVM VM handle.
448	* @param idCpu The ID of the virtual CPU context.
449	* @param Sel The selector to get info about.
450	* @param fFlags Flags, see DBGFQSEL_FLAGS_*.
451	* @param pSelInfo Where to store the information. This will always be
452	* updated.
453	*
454	* @remarks This is a wrapper around SELMR3GetSelectorInfo and
455	* SELMR3GetShadowSelectorInfo.
456	*/
457	VMMR3DECL(int) DBGFR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
458	{
459	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
460	AssertReturn(!(fFlags & ~(DBGFSELQI_FLAGS_DT_GUEST \| DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE)), VERR_INVALID_PARAMETER);
461	AssertReturn( (fFlags & (DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE))
462	!= (DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE), VERR_INVALID_PARAMETER);
463
464	/* Clear the return data here on this thread. */
465	memset(pSelInfo, 0, sizeof(*pSelInfo));
466
467	/*
468	* Dispatch the request to a worker running on the target CPU.
469	*/
470	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3SelQueryInfo, 5, pVM, idCpu, Sel, fFlags, pSelInfo);
471	}
472
473
474	/**
475	* Validates a CS selector.
476	*
477	* @returns VBox status code.
478	* @param pSelInfo Pointer to the selector information for the CS selector.
479	* @param SelCPL The selector defining the CPL (SS).
480	*/
481	VMMDECL(int) DBGFR3SelInfoValidateCS(PCDBGFSELINFO pSelInfo, RTSEL SelCPL)
482	{
483	/*
484	* Check if present.
485	*/
486	if (pSelInfo->u.Raw.Gen.u1Present)
487	{
488	/*
489	* Type check.
490	*/
491	if ( pSelInfo->u.Raw.Gen.u1DescType == 1
492	&& (pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CODE))
493	{
494	/*
495	* Check level.
496	*/
497	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, pSelInfo->Sel & X86_SEL_RPL);
498	if ( !(pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CONF)
499	? uLevel <= pSelInfo->u.Raw.Gen.u2Dpl
500	: uLevel >= pSelInfo->u.Raw.Gen.u2Dpl /* hope I got this right now... */
501	)
502	return VINF_SUCCESS;
503	return VERR_INVALID_RPL;
504	}
505	return VERR_NOT_CODE_SELECTOR;
506	}
507	return VERR_SELECTOR_NOT_PRESENT;
508	}
509
510

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source: vbox/trunk/src/VBox/VMM/DBGFMem.cpp@ 23011

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