DBGFMem.cpp@ 30654

Last change on this file since 30654 was 30320, checked in by vboxsync, 14 years ago
*: Replaced memchr(psz, '\0', cb) with RTStrEnd(psz, cb) and worked around memchr(_{RTSTR_MAX) issue in RTStrEnd. Here (linux.amd64 / glibc-2.10.1-r1) memchr fails for cb > ~(size_t)11. Since RTSTR_MAX is ~(size_t)0, this behavior breaks several IPRT string APIs.}
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1	/* $Id: DBGFMem.cpp 30320 2010-06-21 08:35:09Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Memory Methods.
4	*/
5
6	/*
7	* Copyright (C) 2007 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/dbgf.h>
24	#include <VBox/pgm.h>
25	#include <VBox/selm.h>
26	#include <VBox/hwaccm.h>
27	#include "DBGFInternal.h"
28	#include <VBox/vm.h>
29	#include <VBox/err.h>
30	#include <VBox/log.h>
31	#include <VBox/mm.h>
32
33
34
35	/**
36	* Scan guest memory for an exact byte string.
37	*
38	* @returns VBox status code.
39	* @param pVM The VM handle.
40	* @param idCpu The ID of the CPU context to search in.
41	* @param pAddress Where to store the mixed address.
42	* @param puAlign The alignment restriction imposed on the search result.
43	* @param pcbRange The number of bytes to scan. Passed as a pointer because
44	* it may be 64-bit.
45	* @param pabNeedle What to search for - exact search.
46	* @param cbNeedle Size of the search byte string.
47	* @param pHitAddress Where to put the address of the first hit.
48	*/
49	static DECLCALLBACK(int) dbgfR3MemScan(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, PCRTGCUINTPTR pcbRange, RTGCUINTPTR *puAlign,
50	const uint8_t *pabNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
51	{
52	Assert(idCpu == VMMGetCpuId(pVM));
53
54	/*
55	* Validate the input we use, PGM does the rest.
56	*/
57	RTGCUINTPTR cbRange = *pcbRange;
58	if (!DBGFR3AddrIsValid(pVM, pAddress))
59	return VERR_INVALID_POINTER;
60	if (!VALID_PTR(pHitAddress))
61	return VERR_INVALID_POINTER;
62	if (DBGFADDRESS_IS_HMA(pAddress))
63	return VERR_INVALID_POINTER;
64
65	/*
66	* Select DBGF worker by addressing mode.
67	*/
68	int rc;
69	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
70	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
71	if ( enmMode == PGMMODE_REAL
72	\|\| enmMode == PGMMODE_PROTECTED
73	\|\| DBGFADDRESS_IS_PHYS(pAddress)
74	)
75	{
76	RTGCPHYS GCPhysAlign = *puAlign;
77	if (GCPhysAlign != *puAlign)
78	return VERR_OUT_OF_RANGE;
79	RTGCPHYS PhysHit;
80	rc = PGMR3DbgScanPhysical(pVM, pAddress->FlatPtr, cbRange, GCPhysAlign, 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, *puAlign, 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 uAlign The alignment restriction imposed on the result.
117	* Usually set to 1.
118	* @param pvNeedle What to search for - exact search.
119	* @param cbNeedle Size of the search byte string.
120	* @param pHitAddress Where to put the address of the first hit.
121	*
122	* @thread Any thread.
123	*/
124	VMMR3DECL(int) DBGFR3MemScan(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, RTGCUINTPTR cbRange, RTGCUINTPTR uAlign,
125	const void *pvNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
126	{
127	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
128	return VMR3ReqCallWait(pVM, idCpu, (PFNRT)dbgfR3MemScan, 8,
129	pVM, idCpu, pAddress, &cbRange, &uAlign, pvNeedle, cbNeedle, pHitAddress);
130
131	}
132
133
134	/**
135	* Read guest memory.
136	*
137	* @returns VBox status code.
138	* @param pVM Pointer to the shared VM structure.
139	* @param pAddress Where to start reading.
140	* @param pvBuf Where to store the data we've read.
141	* @param cbRead The number of bytes to read.
142	*/
143	static DECLCALLBACK(int) dbgfR3MemRead(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
144	{
145	Assert(idCpu == VMMGetCpuId(pVM));
146
147	/*
148	* Validate the input we use, PGM does the rest.
149	*/
150	if (!DBGFR3AddrIsValid(pVM, pAddress))
151	return VERR_INVALID_POINTER;
152	if (!VALID_PTR(pvBuf))
153	return VERR_INVALID_POINTER;
154
155	/*
156	* HMA is special
157	*/
158	int rc;
159	if (DBGFADDRESS_IS_HMA(pAddress))
160	{
161	if (DBGFADDRESS_IS_PHYS(pAddress))
162	rc = VERR_INVALID_POINTER;
163	else
164	rc = MMR3HyperReadGCVirt(pVM, pvBuf, pAddress->FlatPtr, cbRead);
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	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemRead, 5, pVM, idCpu, pAddress, pvBuf, cbRead);
213	}
214
215
216	/**
217	* Read a zero terminated string from guest memory.
218	*
219	* @returns VBox status code.
220	*
221	* @param pVM Pointer to the shared VM structure.
222	* @param idCpu The ID of the source CPU context (for the address).
223	* @param pAddress Where to start reading.
224	* @param pszBuf Where to store the string.
225	* @param cchBuf The size of the buffer.
226	*/
227	static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
228	{
229	/*
230	* Validate the input we use, PGM does the rest.
231	*/
232	if (!DBGFR3AddrIsValid(pVM, pAddress))
233	return VERR_INVALID_POINTER;
234	if (!VALID_PTR(pszBuf))
235	return VERR_INVALID_POINTER;
236
237	/*
238	* Let dbgfR3MemRead do the job.
239	*/
240	int rc = dbgfR3MemRead(pVM, idCpu, pAddress, pszBuf, cchBuf);
241
242	/*
243	* Make sure the result is terminated and that overflow is signaled.
244	* This may look a bit reckless with the rc but, it should be fine.
245	*/
246	if (!RTStrEnd(pszBuf, cchBuf))
247	{
248	pszBuf[cchBuf - 1] = '\0';
249	rc = VINF_BUFFER_OVERFLOW;
250	}
251	/*
252	* Handle partial reads (not perfect).
253	*/
254	else if (RT_FAILURE(rc))
255	{
256	if (pszBuf[0])
257	rc = VINF_SUCCESS;
258	}
259
260	return rc;
261	}
262
263
264	/**
265	* Read a zero terminated string from guest memory.
266	*
267	* @returns VBox status code.
268	*
269	* @param pVM Pointer to the shared VM structure.
270	* @param idCpu The ID of the source CPU context (for the address).
271	* @param pAddress Where to start reading.
272	* @param pszBuf Where to store the string.
273	* @param cchBuf The size of the buffer.
274	*/
275	VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
276	{
277	/*
278	* Validate and zero output.
279	*/
280	if (!VALID_PTR(pszBuf))
281	return VERR_INVALID_POINTER;
282	if (cchBuf <= 0)
283	return VERR_INVALID_PARAMETER;
284	memset(pszBuf, 0, cchBuf);
285	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
286
287	/*
288	* Pass it on to the EMT.
289	*/
290	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemReadString, 5, pVM, idCpu, pAddress, pszBuf, cchBuf);
291	}
292
293
294	/**
295	* Writes guest memory.
296	*
297	* @returns VBox status code.
298	*
299	* @param pVM Pointer to the shared VM structure.
300	* @param idCpu The ID of the target CPU context (for the address).
301	* @param pAddress Where to start writing.
302	* @param pvBuf The data to write.
303	* @param cbWrite The number of bytes to write.
304	*/
305	static DECLCALLBACK(int) dbgfR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
306	{
307	/*
308	* Validate the input we use, PGM does the rest.
309	*/
310	if (!DBGFR3AddrIsValid(pVM, pAddress))
311	return VERR_INVALID_POINTER;
312	if (!VALID_PTR(pvBuf))
313	return VERR_INVALID_POINTER;
314
315	/*
316	* HMA is always special.
317	*/
318	int rc;
319	if (DBGFADDRESS_IS_HMA(pAddress))
320	{
321	/** @todo write to HMA. */
322	rc = VERR_ACCESS_DENIED;
323	}
324	else
325	{
326	/*
327	* Select PGM function by addressing mode.
328	*/
329	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
330	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
331	if ( enmMode == PGMMODE_REAL
332	\|\| enmMode == PGMMODE_PROTECTED
333	\|\| DBGFADDRESS_IS_PHYS(pAddress) )
334	rc = PGMPhysSimpleWriteGCPhys(pVM, pAddress->FlatPtr, pvBuf, cbWrite);
335	else
336	{
337	#if GC_ARCH_BITS > 32
338	if ( ( pAddress->FlatPtr >= _4G
339	\|\| pAddress->FlatPtr + cbWrite > _4G)
340	&& enmMode != PGMMODE_AMD64
341	&& enmMode != PGMMODE_AMD64_NX)
342	return VERR_PAGE_TABLE_NOT_PRESENT;
343	#endif
344	rc = PGMPhysSimpleWriteGCPtr(pVCpu, pAddress->FlatPtr, pvBuf, cbWrite);
345	}
346	}
347	return rc;
348	}
349
350
351	/**
352	* Read guest memory.
353	*
354	* @returns VBox status code.
355	*
356	* @param pVM Pointer to the shared VM structure.
357	* @param idCpu The ID of the target CPU context (for the address).
358	* @param pAddress Where to start writing.
359	* @param pvBuf The data to write.
360	* @param cbRead The number of bytes to write.
361	*/
362	VMMR3DECL(int) DBGFR3MemWrite(PVM pVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
363	{
364	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
365	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3MemWrite, 5, pVM, idCpu, pAddress, pvBuf, cbWrite);
366	}
367
368
369	/**
370	* Worker for DBGFR3SelQueryInfo that calls into SELM.
371	*/
372	static DECLCALLBACK(int) dbgfR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
373	{
374	/*
375	* Make the query.
376	*/
377	int rc;
378	if (!(fFlags & DBGFSELQI_FLAGS_DT_SHADOW))
379	{
380	PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
381	VMCPU_ASSERT_EMT(pVCpu);
382	rc = SELMR3GetSelectorInfo(pVM, pVCpu, Sel, pSelInfo);
383
384	/*
385	* 64-bit mode HACKS for making data and stack selectors wide open when
386	* queried. This is voodoo magic.
387	*/
388	if (fFlags & DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE)
389	{
390	/* Expand 64-bit data and stack selectors. The check is a bit bogus... */
391	if ( RT_SUCCESS(rc)
392	&& (pSelInfo->fFlags & ( DBGFSELINFO_FLAGS_LONG_MODE \| DBGFSELINFO_FLAGS_REAL_MODE \| DBGFSELINFO_FLAGS_PROT_MODE
393	\| DBGFSELINFO_FLAGS_GATE \| DBGFSELINFO_FLAGS_HYPER
394	\| DBGFSELINFO_FLAGS_INVALID \| DBGFSELINFO_FLAGS_NOT_PRESENT))
395	== DBGFSELINFO_FLAGS_LONG_MODE
396	&& pSelInfo->cbLimit != ~(RTGCPTR)0
397	&& CPUMIsGuestIn64BitCode(pVCpu, CPUMGetGuestCtxCore(pVCpu)) )
398	{
399	pSelInfo->GCPtrBase = 0;
400	pSelInfo->cbLimit = ~(RTGCPTR)0;
401	}
402	else if ( Sel == 0
403	&& CPUMIsGuestIn64BitCode(pVCpu, CPUMGetGuestCtxCore(pVCpu)))
404	{
405	pSelInfo->GCPtrBase = 0;
406	pSelInfo->cbLimit = ~(RTGCPTR)0;
407	pSelInfo->Sel = 0;
408	pSelInfo->SelGate = 0;
409	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
410	pSelInfo->u.Raw64.Gen.u1Present = 1;
411	pSelInfo->u.Raw64.Gen.u1Long = 1;
412	pSelInfo->u.Raw64.Gen.u1DescType = 1;
413	rc = VINF_SUCCESS;
414	}
415	}
416	}
417	else
418	{
419	if (HWACCMIsEnabled(pVM))
420	rc = VERR_INVALID_STATE;
421	else
422	rc = SELMR3GetShadowSelectorInfo(pVM, Sel, pSelInfo);
423	}
424	return rc;
425	}
426
427
428	/**
429	* Gets information about a selector.
430	*
431	* Intended for the debugger mostly and will prefer the guest
432	* descriptor tables over the shadow ones.
433	*
434	* @returns VBox status code, the following are the common ones.
435	* @retval VINF_SUCCESS on success.
436	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
437	* descriptor table.
438	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
439	* is not returned if the selector itself isn't present, you have to
440	* check that for yourself (see DBGFSELINFO::fFlags).
441	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
442	* pagetable or page backing the selector table wasn't present.
443	*
444	* @param pVM VM handle.
445	* @param idCpu The ID of the virtual CPU context.
446	* @param Sel The selector to get info about.
447	* @param fFlags Flags, see DBGFQSEL_FLAGS_*.
448	* @param pSelInfo Where to store the information. This will always be
449	* updated.
450	*
451	* @remarks This is a wrapper around SELMR3GetSelectorInfo and
452	* SELMR3GetShadowSelectorInfo.
453	*/
454	VMMR3DECL(int) DBGFR3SelQueryInfo(PVM pVM, VMCPUID idCpu, RTSEL Sel, uint32_t fFlags, PDBGFSELINFO pSelInfo)
455	{
456	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
457	AssertReturn(!(fFlags & ~(DBGFSELQI_FLAGS_DT_GUEST \| DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE)), VERR_INVALID_PARAMETER);
458	AssertReturn( (fFlags & (DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE))
459	!= (DBGFSELQI_FLAGS_DT_SHADOW \| DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE), VERR_INVALID_PARAMETER);
460
461	/* Clear the return data here on this thread. */
462	memset(pSelInfo, 0, sizeof(*pSelInfo));
463
464	/*
465	* Dispatch the request to a worker running on the target CPU.
466	*/
467	return VMR3ReqCallWaitU(pVM->pUVM, idCpu, (PFNRT)dbgfR3SelQueryInfo, 5, pVM, idCpu, Sel, fFlags, pSelInfo);
468	}
469
470
471	/**
472	* Validates a CS selector.
473	*
474	* @returns VBox status code.
475	* @param pSelInfo Pointer to the selector information for the CS selector.
476	* @param SelCPL The selector defining the CPL (SS).
477	*/
478	VMMDECL(int) DBGFR3SelInfoValidateCS(PCDBGFSELINFO pSelInfo, RTSEL SelCPL)
479	{
480	/*
481	* Check if present.
482	*/
483	if (pSelInfo->u.Raw.Gen.u1Present)
484	{
485	/*
486	* Type check.
487	*/
488	if ( pSelInfo->u.Raw.Gen.u1DescType == 1
489	&& (pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CODE))
490	{
491	/*
492	* Check level.
493	*/
494	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, pSelInfo->Sel & X86_SEL_RPL);
495	if ( !(pSelInfo->u.Raw.Gen.u4Type & X86_SEL_TYPE_CONF)
496	? uLevel <= pSelInfo->u.Raw.Gen.u2Dpl
497	: uLevel >= pSelInfo->u.Raw.Gen.u2Dpl /* hope I got this right now... */
498	)
499	return VINF_SUCCESS;
500	return VERR_INVALID_RPL;
501	}
502	return VERR_NOT_CODE_SELECTOR;
503	}
504	return VERR_SELECTOR_NOT_PRESENT;
505	}
506

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source: vbox/trunk/src/VBox/VMM/DBGFMem.cpp@ 30654

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