PGMDbg.cpp@ 28112

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1	/* $Id: PGMDbg.cpp 27543 2010-03-19 15:47:14Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager and Monitor - Debugger & Debugging APIs.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 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	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_PGM
26	#include <VBox/pgm.h>
27	#include <VBox/stam.h>
28	#include "PGMInternal.h"
29	#include <VBox/vm.h>
30	#include "PGMInline.h"
31	#include <iprt/assert.h>
32	#include <iprt/asm.h>
33	#include <iprt/string.h>
34	#include <VBox/log.h>
35	#include <VBox/param.h>
36	#include <VBox/err.h>
37
38
39	/*******************************************************************************
40	* Defined Constants And Macros *
41	*******************************************************************************/
42	/** The max needle size that we will bother searching for
43	* This must not be more than half a page! */
44	#define MAX_NEEDLE_SIZE 256
45
46
47	/**
48	* Converts a R3 pointer to a GC physical address.
49	*
50	* Only for the debugger.
51	*
52	* @returns VBox status code.
53	* @retval VINF_SUCCESS on success, *pGCPhys is set.
54	* @retval VERR_INVALID_POINTER if the pointer is not within the GC physical memory.
55	*
56	* @param pVM The VM handle.
57	* @param R3Ptr The R3 pointer to convert.
58	* @param pGCPhys Where to store the GC physical address on success.
59	*/
60	VMMR3DECL(int) PGMR3DbgR3Ptr2GCPhys(PVM pVM, RTR3PTR R3Ptr, PRTGCPHYS pGCPhys)
61	{
62	*pGCPhys = NIL_RTGCPHYS;
63	return VERR_NOT_IMPLEMENTED;
64	}
65
66
67	/**
68	* Converts a R3 pointer to a HC physical address.
69	*
70	* Only for the debugger.
71	*
72	* @returns VBox status code.
73	* @retval VINF_SUCCESS on success, *pHCPhys is set.
74	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical page but has no physical backing.
75	* @retval VERR_INVALID_POINTER if the pointer is not within the GC physical memory.
76	*
77	* @param pVM The VM handle.
78	* @param R3Ptr The R3 pointer to convert.
79	* @param pHCPhys Where to store the HC physical address on success.
80	*/
81	VMMR3DECL(int) PGMR3DbgR3Ptr2HCPhys(PVM pVM, RTR3PTR R3Ptr, PRTHCPHYS pHCPhys)
82	{
83	*pHCPhys = NIL_RTHCPHYS;
84	return VERR_NOT_IMPLEMENTED;
85	}
86
87
88	/**
89	* Converts a HC physical address to a GC physical address.
90	*
91	* Only for the debugger.
92	*
93	* @returns VBox status code
94	* @retval VINF_SUCCESS on success, *pGCPhys is set.
95	* @retval VERR_INVALID_POINTER if the HC physical address is not within the GC physical memory.
96	*
97	* @param pVM The VM handle.
98	* @param HCPhys The HC physical address to convert.
99	* @param pGCPhys Where to store the GC physical address on success.
100	*/
101	VMMR3DECL(int) PGMR3DbgHCPhys2GCPhys(PVM pVM, RTHCPHYS HCPhys, PRTGCPHYS pGCPhys)
102	{
103	/*
104	* Validate and adjust the input a bit.
105	*/
106	if (HCPhys == NIL_RTHCPHYS)
107	return VERR_INVALID_POINTER;
108	unsigned off = HCPhys & PAGE_OFFSET_MASK;
109	HCPhys &= X86_PTE_PAE_PG_MASK;
110	if (HCPhys == 0)
111	return VERR_INVALID_POINTER;
112
113	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
114	pRam;
115	pRam = pRam->CTX_SUFF(pNext))
116	{
117	uint32_t iPage = pRam->cb >> PAGE_SHIFT;
118	while (iPage-- > 0)
119	if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
120	{
121	*pGCPhys = pRam->GCPhys + (iPage << PAGE_SHIFT) + off;
122	return VINF_SUCCESS;
123	}
124	}
125	return VERR_INVALID_POINTER;
126	}
127
128
129	/**
130	* Read physical memory API for the debugger, similar to
131	* PGMPhysSimpleReadGCPhys.
132	*
133	* @returns VBox status code.
134	*
135	* @param pVM The VM handle.
136	* @param pvDst Where to store what's read.
137	* @param GCPhysDst Where to start reading from.
138	* @param cb The number of bytes to attempt reading.
139	* @param fFlags Flags, MBZ.
140	* @param pcbRead For store the actual number of bytes read, pass NULL if
141	* partial reads are unwanted.
142	* @todo Unused?
143	*/
144	VMMR3DECL(int) PGMR3DbgReadGCPhys(PVM pVM, void pvDst, RTGCPHYS GCPhysSrc, size_t cb, uint32_t fFlags, size_t pcbRead)
145	{
146	/* validate */
147	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
148	AssertReturn(pVM, VERR_INVALID_PARAMETER);
149
150	/* try simple first. */
151	int rc = PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc, cb);
152	if (RT_SUCCESS(rc) \|\| !pcbRead)
153	return rc;
154
155	/* partial read that failed, chop it up in pages. */
156	*pcbRead = 0;
157	size_t const cbReq = cb;
158	rc = VINF_SUCCESS;
159	while (cb > 0)
160	{
161	size_t cbChunk = PAGE_SIZE;
162	cbChunk -= GCPhysSrc & PAGE_OFFSET_MASK;
163	if (cbChunk > cb)
164	cbChunk = cb;
165
166	rc = PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc, cbChunk);
167
168	/* advance */
169	if (RT_FAILURE(rc))
170	break;
171	*pcbRead += cbChunk;
172	cb -= cbChunk;
173	GCPhysSrc += cbChunk;
174	pvDst = (uint8_t *)pvDst + cbChunk;
175	}
176
177	return *pcbRead && RT_FAILURE(rc) ? -rc : rc;
178	}
179
180
181	/**
182	* Write physical memory API for the debugger, similar to
183	* PGMPhysSimpleWriteGCPhys.
184	*
185	* @returns VBox status code.
186	*
187	* @param pVM The VM handle.
188	* @param GCPhysDst Where to start writing.
189	* @param pvSrc What to write.
190	* @param cb The number of bytes to attempt writing.
191	* @param fFlags Flags, MBZ.
192	* @param pcbWritten For store the actual number of bytes written, pass NULL
193	* if partial writes are unwanted.
194	* @todo Unused?
195	*/
196	VMMR3DECL(int) PGMR3DbgWriteGCPhys(PVM pVM, RTGCPHYS GCPhysDst, const void pvSrc, size_t cb, uint32_t fFlags, size_t pcbWritten)
197	{
198	/* validate */
199	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
200	AssertReturn(pVM, VERR_INVALID_PARAMETER);
201
202	/* try simple first. */
203	int rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysDst, pvSrc, cb);
204	if (RT_SUCCESS(rc) \|\| !pcbWritten)
205	return rc;
206
207	/* partial write that failed, chop it up in pages. */
208	*pcbWritten = 0;
209	rc = VINF_SUCCESS;
210	while (cb > 0)
211	{
212	size_t cbChunk = PAGE_SIZE;
213	cbChunk -= GCPhysDst & PAGE_OFFSET_MASK;
214	if (cbChunk > cb)
215	cbChunk = cb;
216
217	rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysDst, pvSrc, cbChunk);
218
219	/* advance */
220	if (RT_FAILURE(rc))
221	break;
222	*pcbWritten += cbChunk;
223	cb -= cbChunk;
224	GCPhysDst += cbChunk;
225	pvSrc = (uint8_t const *)pvSrc + cbChunk;
226	}
227
228	return *pcbWritten && RT_FAILURE(rc) ? -rc : rc;
229
230	}
231
232
233	/**
234	* Read virtual memory API for the debugger, similar to PGMPhysSimpleReadGCPtr.
235	*
236	* @returns VBox status code.
237	*
238	* @param pVM The VM handle.
239	* @param pvDst Where to store what's read.
240	* @param GCPtrDst Where to start reading from.
241	* @param cb The number of bytes to attempt reading.
242	* @param fFlags Flags, MBZ.
243	* @param pcbRead For store the actual number of bytes read, pass NULL if
244	* partial reads are unwanted.
245	* @todo Unused?
246	*/
247	VMMR3DECL(int) PGMR3DbgReadGCPtr(PVM pVM, void pvDst, RTGCPTR GCPtrSrc, size_t cb, uint32_t fFlags, size_t pcbRead)
248	{
249	/* validate */
250	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
251	AssertReturn(pVM, VERR_INVALID_PARAMETER);
252
253	/* @todo SMP support! */
254	PVMCPU pVCpu = &pVM->aCpus[0];
255
256	/** @todo deal with HMA */
257	/* try simple first. */
258	int rc = PGMPhysSimpleReadGCPtr(pVCpu, pvDst, GCPtrSrc, cb);
259	if (RT_SUCCESS(rc) \|\| !pcbRead)
260	return rc;
261
262	/* partial read that failed, chop it up in pages. */
263	*pcbRead = 0;
264	rc = VINF_SUCCESS;
265	while (cb > 0)
266	{
267	size_t cbChunk = PAGE_SIZE;
268	cbChunk -= GCPtrSrc & PAGE_OFFSET_MASK;
269	if (cbChunk > cb)
270	cbChunk = cb;
271
272	rc = PGMPhysSimpleReadGCPtr(pVCpu, pvDst, GCPtrSrc, cbChunk);
273
274	/* advance */
275	if (RT_FAILURE(rc))
276	break;
277	*pcbRead += cbChunk;
278	cb -= cbChunk;
279	GCPtrSrc += cbChunk;
280	pvDst = (uint8_t *)pvDst + cbChunk;
281	}
282
283	return *pcbRead && RT_FAILURE(rc) ? -rc : rc;
284
285	}
286
287
288	/**
289	* Write virtual memory API for the debugger, similar to
290	* PGMPhysSimpleWriteGCPtr.
291	*
292	* @returns VBox status code.
293	*
294	* @param pVM The VM handle.
295	* @param GCPtrDst Where to start writing.
296	* @param pvSrc What to write.
297	* @param cb The number of bytes to attempt writing.
298	* @param fFlags Flags, MBZ.
299	* @param pcbWritten For store the actual number of bytes written, pass NULL
300	* if partial writes are unwanted.
301	* @todo Unused?
302	*/
303	VMMR3DECL(int) PGMR3DbgWriteGCPtr(PVM pVM, RTGCPTR GCPtrDst, void const pvSrc, size_t cb, uint32_t fFlags, size_t pcbWritten)
304	{
305	/* validate */
306	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
307	AssertReturn(pVM, VERR_INVALID_PARAMETER);
308
309	/* @todo SMP support! */
310	PVMCPU pVCpu = &pVM->aCpus[0];
311
312	/** @todo deal with HMA */
313	/* try simple first. */
314	int rc = PGMPhysSimpleWriteGCPtr(pVCpu, GCPtrDst, pvSrc, cb);
315	if (RT_SUCCESS(rc) \|\| !pcbWritten)
316	return rc;
317
318	/* partial write that failed, chop it up in pages. */
319	*pcbWritten = 0;
320	rc = VINF_SUCCESS;
321	while (cb > 0)
322	{
323	size_t cbChunk = PAGE_SIZE;
324	cbChunk -= GCPtrDst & PAGE_OFFSET_MASK;
325	if (cbChunk > cb)
326	cbChunk = cb;
327
328	rc = PGMPhysSimpleWriteGCPtr(pVCpu, GCPtrDst, pvSrc, cbChunk);
329
330	/* advance */
331	if (RT_FAILURE(rc))
332	break;
333	*pcbWritten += cbChunk;
334	cb -= cbChunk;
335	GCPtrDst += cbChunk;
336	pvSrc = (uint8_t const *)pvSrc + cbChunk;
337	}
338
339	return *pcbWritten && RT_FAILURE(rc) ? -rc : rc;
340
341	}
342
343
344	/**
345	* memchr() with alignment considerations.
346	*
347	* @returns Pointer to matching byte, NULL if none found.
348	* @param pb Where to search. Aligned.
349	* @param b What to search for.
350	* @param cb How much to search .
351	* @param uAlign The alignment restriction of the result.
352	*/
353	static const uint8_t pgmR3DbgAlignedMemChr(const uint8_t pb, uint8_t b, size_t cb, uint32_t uAlign)
354	{
355	const uint8_t *pbRet;
356	if (uAlign <= 32)
357	{
358	pbRet = (const uint8_t *)memchr(pb, b, cb);
359	if ((uintptr_t)pbRet & (uAlign - 1))
360	{
361	do
362	{
363	pbRet++;
364	size_t cbLeft = cb - (pbRet - pb);
365	if (!cbLeft)
366	{
367	pbRet = NULL;
368	break;
369	}
370	pbRet = (const uint8_t *)memchr(pbRet, b, cbLeft);
371	} while ((uintptr_t)pbRet & (uAlign - 1));
372	}
373	}
374	else
375	{
376	pbRet = NULL;
377	if (cb)
378	{
379	for (;;)
380	{
381	if (*pb == b)
382	{
383	pbRet = pb;
384	break;
385	}
386	if (cb <= uAlign)
387	break;
388	cb -= uAlign;
389	pb += uAlign;
390	}
391	}
392	}
393	return pbRet;
394	}
395
396
397	/**
398	* Scans a page for a byte string, keeping track of potential
399	* cross page matches.
400	*
401	* @returns true and *poff on match.
402	* false on mismatch.
403	* @param pbPage Pointer to the current page.
404	* @param poff Input: The offset into the page (aligned).
405	* Output: The page offset of the match on success.
406	* @param cb The number of bytes to search, starting of *poff.
407	* @param uAlign The needle alignment. This is of course less than a page.
408	* @param pabNeedle The byte string to search for.
409	* @param cbNeedle The length of the byte string.
410	* @param pabPrev The buffer that keeps track of a partial match that we
411	* bring over from the previous page. This buffer must be
412	* at least cbNeedle - 1 big.
413	* @param pcbPrev Input: The number of partial matching bytes from the previous page.
414	* Output: The number of partial matching bytes from this page.
415	* Initialize to 0 before the first call to this function.
416	*/
417	static bool pgmR3DbgScanPage(const uint8_t pbPage, int32_t poff, uint32_t cb, uint32_t uAlign,
418	const uint8_t *pabNeedle, size_t cbNeedle,
419	uint8_t pabPrev, size_t pcbPrev)
420	{
421	/*
422	* Try complete any partial match from the previous page.
423	*/
424	if (*pcbPrev > 0)
425	{
426	size_t cbPrev = *pcbPrev;
427	Assert(!*poff);
428	Assert(cbPrev < cbNeedle);
429	if (!memcmp(pbPage, pabNeedle + cbPrev, cbNeedle - cbPrev))
430	{
431	if (cbNeedle - cbPrev > cb)
432	return false;
433	*poff = -(int32_t)cbPrev;
434	return true;
435	}
436
437	/* check out the remainder of the previous page. */
438	const uint8_t *pb = pabPrev;
439	for (;;)
440	{
441	if (cbPrev <= uAlign)
442	break;
443	cbPrev -= uAlign;
444	pb = pgmR3DbgAlignedMemChr(pb + uAlign, *pabNeedle, cbPrev, uAlign);
445	if (!pb)
446	break;
447	cbPrev = *pcbPrev - (pb - pabPrev);
448	if ( !memcmp(pb + 1, &pabNeedle[1], cbPrev - 1)
449	&& !memcmp(pbPage, pabNeedle + cbPrev, cbNeedle - cbPrev))
450	{
451	if (cbNeedle - cbPrev > cb)
452	return false;
453	*poff = -(int32_t)cbPrev;
454	return true;
455	}
456	}
457
458	*pcbPrev = 0;
459	}
460
461	/*
462	* Match the body of the page.
463	*/
464	const uint8_t pb = pbPage + poff;
465	const uint8_t *pbEnd = pb + cb;
466	for (;;)
467	{
468	pb = pgmR3DbgAlignedMemChr(pb, *pabNeedle, cb, uAlign);
469	if (!pb)
470	break;
471	cb = pbEnd - pb;
472	if (cb >= cbNeedle)
473	{
474	/* match? */
475	if (!memcmp(pb + 1, &pabNeedle[1], cbNeedle - 1))
476	{
477	*poff = pb - pbPage;
478	return true;
479	}
480	}
481	else
482	{
483	/* paritial match at the end of the page? */
484	if (!memcmp(pb + 1, &pabNeedle[1], cb - 1))
485	{
486	/* We're copying one byte more that we really need here, but wtf. */
487	memcpy(pabPrev, pb, cb);
488	*pcbPrev = cb;
489	return false;
490	}
491	}
492
493	/* no match, skip ahead. */
494	if (cb <= uAlign)
495	break;
496	pb += uAlign;
497	cb -= uAlign;
498	}
499
500	return false;
501	}
502
503
504	/**
505	* Scans guest physical memory for a byte string.
506	*
507	* @returns VBox status codes:
508	* @retval VINF_SUCCESS and *pGCPtrHit on success.
509	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
510	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
511	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
512	*
513	* @param pVM Pointer to the shared VM structure.
514	* @param GCPhys Where to start searching.
515	* @param cbRange The number of bytes to search.
516	* @param GCPhysAlign The alignment of the needle. Must be a power of two
517	* and less or equal to 4GB.
518	* @param pabNeedle The byte string to search for.
519	* @param cbNeedle The length of the byte string. Max 256 bytes.
520	* @param pGCPhysHit Where to store the address of the first occurence on success.
521	*/
522	VMMR3DECL(int) PGMR3DbgScanPhysical(PVM pVM, RTGCPHYS GCPhys, RTGCPHYS cbRange, RTGCPHYS GCPhysAlign,
523	const uint8_t *pabNeedle, size_t cbNeedle, PRTGCPHYS pGCPhysHit)
524	{
525	/*
526	* Validate and adjust the input a bit.
527	*/
528	if (!VALID_PTR(pGCPhysHit))
529	return VERR_INVALID_POINTER;
530	*pGCPhysHit = NIL_RTGCPHYS;
531
532	if ( !VALID_PTR(pabNeedle)
533	\|\| GCPhys == NIL_RTGCPHYS)
534	return VERR_INVALID_POINTER;
535	if (!cbNeedle)
536	return VERR_INVALID_PARAMETER;
537	if (cbNeedle > MAX_NEEDLE_SIZE)
538	return VERR_INVALID_PARAMETER;
539
540	if (!cbRange)
541	return VERR_DBGF_MEM_NOT_FOUND;
542	if (GCPhys + cbNeedle - 1 < GCPhys)
543	return VERR_DBGF_MEM_NOT_FOUND;
544
545	if (!GCPhysAlign)
546	return VERR_INVALID_PARAMETER;
547	if (GCPhysAlign > UINT32_MAX)
548	return VERR_NOT_POWER_OF_TWO;
549	if (GCPhysAlign & (GCPhysAlign - 1))
550	return VERR_INVALID_PARAMETER;
551
552	if (GCPhys & (GCPhysAlign - 1))
553	{
554	RTGCPHYS Adj = GCPhysAlign - (GCPhys & (GCPhysAlign - 1));
555	if ( cbRange <= Adj
556	\|\| GCPhys + Adj < GCPhys)
557	return VERR_DBGF_MEM_NOT_FOUND;
558	GCPhys += Adj;
559	cbRange -= Adj;
560	}
561
562	const bool fAllZero = ASMMemIsAll8(pabNeedle, cbNeedle, 0) == NULL;
563	const uint32_t cIncPages = GCPhysAlign <= PAGE_SIZE
564	? 1
565	: GCPhysAlign >> PAGE_SHIFT;
566	const RTGCPHYS GCPhysLast = GCPhys + cbRange - 1 >= GCPhys
567	? GCPhys + cbRange - 1
568	: ~(RTGCPHYS)0;
569
570	/*
571	* Search the memory - ignore MMIO and zero pages, also don't
572	* bother to match across ranges.
573	*/
574	pgmLock(pVM);
575	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
576	pRam;
577	pRam = pRam->CTX_SUFF(pNext))
578	{
579	/*
580	* If the search range starts prior to the current ram range record,
581	* adjust the search range and possibly conclude the search.
582	*/
583	RTGCPHYS off;
584	if (GCPhys < pRam->GCPhys)
585	{
586	if (GCPhysLast < pRam->GCPhys)
587	break;
588	GCPhys = pRam->GCPhys;
589	off = 0;
590	}
591	else
592	off = GCPhys - pRam->GCPhys;
593	if (off < pRam->cb)
594	{
595	/*
596	* Iterate the relevant pages.
597	*/
598	uint8_t abPrev[MAX_NEEDLE_SIZE];
599	size_t cbPrev = 0;
600	const uint32_t cPages = pRam->cb >> PAGE_SHIFT;
601	uint32_t iPage = off >> PAGE_SHIFT;
602	uint32_t offPage = GCPhys & PAGE_OFFSET_MASK;
603	GCPhys &= ~(RTGCPHYS)PAGE_OFFSET_MASK;
604	for (;; offPage = 0)
605	{
606	PPGMPAGE pPage = &pRam->aPages[iPage];
607	if ( ( !PGM_PAGE_IS_ZERO(pPage)
608	\|\| fAllZero)
609	&& !PGM_PAGE_IS_BALLOONED(pPage)
610	&& !PGM_PAGE_IS_MMIO(pPage))
611	{
612	void const *pvPage;
613	PGMPAGEMAPLOCK Lock;
614	int rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys, &pvPage, &Lock);
615	if (RT_SUCCESS(rc))
616	{
617	int32_t offHit = offPage;
618	bool fRc;
619	if (GCPhysAlign < PAGE_SIZE)
620	{
621	uint32_t cbSearch = (GCPhys ^ GCPhysLast) & ~(RTGCPHYS)PAGE_OFFSET_MASK
622	? PAGE_SIZE - (uint32_t)offPage
623	: (GCPhysLast & PAGE_OFFSET_MASK) + 1 - (uint32_t)offPage;
624	fRc = pgmR3DbgScanPage((uint8_t const *)pvPage, &offHit, cbSearch, (uint32_t)GCPhysAlign,
625	pabNeedle, cbNeedle, &abPrev[0], &cbPrev);
626	}
627	else
628	fRc = memcmp(pvPage, pabNeedle, cbNeedle) == 0
629	&& (GCPhysLast - GCPhys) >= cbNeedle;
630	PGMPhysReleasePageMappingLock(pVM, &Lock);
631	if (fRc)
632	{
633	*pGCPhysHit = GCPhys + offHit;
634	pgmUnlock(pVM);
635	return VINF_SUCCESS;
636	}
637	}
638	else
639	cbPrev = 0; /* ignore error. */
640	}
641	else
642	cbPrev = 0;
643
644	/* advance to the next page. */
645	GCPhys += (RTGCPHYS)cIncPages << PAGE_SHIFT;
646	if (GCPhys >= GCPhysLast) /* (may not always hit, but we're run out of ranges.) */
647	{
648	pgmUnlock(pVM);
649	return VERR_DBGF_MEM_NOT_FOUND;
650	}
651	iPage += cIncPages;
652	if ( iPage < cIncPages
653	\|\| iPage >= cPages)
654	break;
655	}
656	}
657	}
658	pgmUnlock(pVM);
659	return VERR_DBGF_MEM_NOT_FOUND;
660	}
661
662
663	/**
664	* Scans (guest) virtual memory for a byte string.
665	*
666	* @returns VBox status codes:
667	* @retval VINF_SUCCESS and *pGCPtrHit on success.
668	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
669	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
670	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
671	*
672	* @param pVM Pointer to the shared VM structure.
673	* @param pVCpu The CPU context to search in.
674	* @param GCPtr Where to start searching.
675	* @param GCPtrAlign The alignment of the needle. Must be a power of two
676	* and less or equal to 4GB.
677	* @param cbRange The number of bytes to search. Max 256 bytes.
678	* @param pabNeedle The byte string to search for.
679	* @param cbNeedle The length of the byte string.
680	* @param pGCPtrHit Where to store the address of the first occurence on success.
681	*/
682	VMMR3DECL(int) PGMR3DbgScanVirtual(PVM pVM, PVMCPU pVCpu, RTGCPTR GCPtr, RTGCPTR cbRange, RTGCPTR GCPtrAlign,
683	const uint8_t *pabNeedle, size_t cbNeedle, PRTGCUINTPTR pGCPtrHit)
684	{
685	VMCPU_ASSERT_EMT(pVCpu);
686
687	/*
688	* Validate and adjust the input a bit.
689	*/
690	if (!VALID_PTR(pGCPtrHit))
691	return VERR_INVALID_POINTER;
692	*pGCPtrHit = 0;
693
694	if (!VALID_PTR(pabNeedle))
695	return VERR_INVALID_POINTER;
696	if (!cbNeedle)
697	return VERR_INVALID_PARAMETER;
698	if (cbNeedle > MAX_NEEDLE_SIZE)
699	return VERR_INVALID_PARAMETER;
700
701	if (!cbRange)
702	return VERR_DBGF_MEM_NOT_FOUND;
703	if (GCPtr + cbNeedle - 1 < GCPtr)
704	return VERR_DBGF_MEM_NOT_FOUND;
705
706	if (!GCPtrAlign)
707	return VERR_INVALID_PARAMETER;
708	if (GCPtrAlign > UINT32_MAX)
709	return VERR_NOT_POWER_OF_TWO;
710	if (GCPtrAlign & (GCPtrAlign - 1))
711	return VERR_INVALID_PARAMETER;
712
713	if (GCPtr & (GCPtrAlign - 1))
714	{
715	RTGCPTR Adj = GCPtrAlign - (GCPtr & (GCPtrAlign - 1));
716	if ( cbRange <= Adj
717	\|\| GCPtr + Adj < GCPtr)
718	return VERR_DBGF_MEM_NOT_FOUND;
719	GCPtr += Adj;
720	cbRange -= Adj;
721	}
722
723	/*
724	* Search the memory - ignore MMIO, zero and not-present pages.
725	*/
726	const bool fAllZero = ASMMemIsAll8(pabNeedle, cbNeedle, 0) == NULL;
727	PGMMODE enmMode = PGMGetGuestMode(pVCpu);
728	RTGCPTR GCPtrMask = PGMMODE_IS_LONG_MODE(enmMode) ? UINT64_MAX : UINT32_MAX;
729	uint8_t abPrev[MAX_NEEDLE_SIZE];
730	size_t cbPrev = 0;
731	const uint32_t cIncPages = GCPtrAlign <= PAGE_SIZE
732	? 1
733	: GCPtrAlign >> PAGE_SHIFT;
734	const RTGCPTR GCPtrLast = GCPtr + cbRange - 1 >= GCPtr
735	? (GCPtr + cbRange - 1) & GCPtrMask
736	: GCPtrMask;
737	RTGCPTR cPages = (((GCPtrLast - GCPtr) + (GCPtr & PAGE_OFFSET_MASK)) >> PAGE_SHIFT) + 1;
738	uint32_t offPage = GCPtr & PAGE_OFFSET_MASK;
739	GCPtr &= ~(RTGCPTR)PAGE_OFFSET_MASK;
740	for (;; offPage = 0)
741	{
742	RTGCPHYS GCPhys;
743	int rc = PGMPhysGCPtr2GCPhys(pVCpu, GCPtr, &GCPhys);
744	if (RT_SUCCESS(rc))
745	{
746	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
747	if ( pPage
748	&& ( !PGM_PAGE_IS_ZERO(pPage)
749	\|\| fAllZero)
750	&& !PGM_PAGE_IS_BALLOONED(pPage)
751	&& !PGM_PAGE_IS_MMIO(pPage))
752	{
753	void const *pvPage;
754	PGMPAGEMAPLOCK Lock;
755	rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys, &pvPage, &Lock);
756	if (RT_SUCCESS(rc))
757	{
758	int32_t offHit = offPage;
759	bool fRc;
760	if (GCPtrAlign < PAGE_SIZE)
761	{
762	uint32_t cbSearch = cPages > 0
763	? PAGE_SIZE - (uint32_t)offPage
764	: (GCPtrLast & PAGE_OFFSET_MASK) + 1 - (uint32_t)offPage;
765	fRc = pgmR3DbgScanPage((uint8_t const *)pvPage, &offHit, cbSearch, (uint32_t)GCPtrAlign,
766	pabNeedle, cbNeedle, &abPrev[0], &cbPrev);
767	}
768	else
769	fRc = memcmp(pvPage, pabNeedle, cbNeedle) == 0
770	&& (GCPtrLast - GCPtr) >= cbNeedle;
771	PGMPhysReleasePageMappingLock(pVM, &Lock);
772	if (fRc)
773	{
774	*pGCPtrHit = GCPtr + offHit;
775	return VINF_SUCCESS;
776	}
777	}
778	else
779	cbPrev = 0; /* ignore error. */
780	}
781	else
782	cbPrev = 0;
783	}
784	else
785	cbPrev = 0; /* ignore error. */
786
787	/* advance to the next page. */
788	if (cPages <= cIncPages)
789	break;
790	cPages -= cIncPages;
791	GCPtr += (RTGCPTR)cIncPages << PAGE_SHIFT;
792	}
793	return VERR_DBGF_MEM_NOT_FOUND;
794	}
795

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source: vbox/trunk/src/VBox/VMM/PGMDbg.cpp@ 28112

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