PGMDbg.cpp@ 15941

Last change on this file since 15941 was 14966, checked in by vboxsync, 16 years ago
PDM, DBGC: debugger read and write APIs.
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1	/* $Id: PGMDbg.cpp 14966 2008-12-04 01:54:38Z 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 <iprt/assert.h>
31	#include <iprt/asm.h>
32	#include <iprt/string.h>
33	#include <VBox/log.h>
34	#include <VBox/param.h>
35	#include <VBox/err.h>
36
37	/** The max needle size that we will bother searching for
38	* This must not be more than half a page! */
39	#define MAX_NEEDLE_SIZE 256
40
41
42	/**
43	* Converts a R3 pointer to a GC physical address.
44	*
45	* Only for the debugger.
46	*
47	* @returns VBox status code.
48	* @retval VINF_SUCCESS on success, *pGCPhys is set.
49	* @retval VERR_INVALID_POINTER if the pointer is not within the GC physical memory.
50	*
51	* @param pVM The VM handle.
52	* @param R3Ptr The R3 pointer to convert.
53	* @param pGCPhys Where to store the GC physical address on success.
54	*/
55	VMMR3DECL(int) PGMR3DbgR3Ptr2GCPhys(PVM pVM, RTR3PTR R3Ptr, PRTGCPHYS pGCPhys)
56	{
57	#ifdef VBOX_WITH_NEW_PHYS_CODE
58	*pGCPhys = NIL_RTGCPHYS;
59	return VERR_NOT_IMPLEMENTED;
60
61	#else
62	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
63	pRam;
64	pRam = pRam->CTX_SUFF(pNext))
65	{
66	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
67	{
68	for (unsigned iChunk = 0; iChunk < (pRam->cb >> PGM_DYNAMIC_CHUNK_SHIFT); iChunk++)
69	{
70	if (pRam->paChunkR3Ptrs[iChunk])
71	{
72	RTR3UINTPTR off = (RTR3UINTPTR)R3Ptr - pRam->paChunkR3Ptrs[iChunk];
73	if (off < PGM_DYNAMIC_CHUNK_SIZE)
74	{
75	pGCPhys = pRam->GCPhys + iChunkPGM_DYNAMIC_CHUNK_SIZE + off;
76	return VINF_SUCCESS;
77	}
78	}
79	}
80	}
81	else if (pRam->pvR3)
82	{
83	RTR3UINTPTR off = (RTR3UINTPTR)R3Ptr - (RTR3UINTPTR)pRam->pvR3;
84	if (off < pRam->cb)
85	{
86	*pGCPhys = pRam->GCPhys + off;
87	return VINF_SUCCESS;
88	}
89	}
90	}
91	return VERR_INVALID_POINTER;
92	#endif
93	}
94
95
96	/**
97	* Converts a R3 pointer to a HC physical address.
98	*
99	* Only for the debugger.
100	*
101	* @returns VBox status code.
102	* @retval VINF_SUCCESS on success, *pHCPhys is set.
103	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical page but has no physical backing.
104	* @retval VERR_INVALID_POINTER if the pointer is not within the GC physical memory.
105	*
106	* @param pVM The VM handle.
107	* @param R3Ptr The R3 pointer to convert.
108	* @param pHCPhys Where to store the HC physical address on success.
109	*/
110	VMMR3DECL(int) PGMR3DbgR3Ptr2HCPhys(PVM pVM, RTR3PTR R3Ptr, PRTHCPHYS pHCPhys)
111	{
112	#ifdef VBOX_WITH_NEW_PHYS_CODE
113	*pHCPhys = NIL_RTHCPHYS;
114	return VERR_NOT_IMPLEMENTED;
115
116	#else
117	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
118	pRam;
119	pRam = pRam->CTX_SUFF(pNext))
120	{
121	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
122	{
123	for (unsigned iChunk = 0; iChunk < (pRam->cb >> PGM_DYNAMIC_CHUNK_SHIFT); iChunk++)
124	{
125	if (pRam->paChunkR3Ptrs[iChunk])
126	{
127	RTR3UINTPTR off = (RTR3UINTPTR)R3Ptr - pRam->paChunkR3Ptrs[iChunk];
128	if (off < PGM_DYNAMIC_CHUNK_SIZE)
129	{
130	PPGMPAGE pPage = &pRam->aPages[off >> PAGE_SHIFT];
131	if (PGM_PAGE_IS_RESERVED(pPage))
132	return VERR_PGM_PHYS_PAGE_RESERVED;
133	*pHCPhys = PGM_PAGE_GET_HCPHYS(pPage)
134	\| (off & PAGE_OFFSET_MASK);
135	return VINF_SUCCESS;
136	}
137	}
138	}
139	}
140	else if (pRam->pvR3)
141	{
142	RTR3UINTPTR off = (RTR3UINTPTR)R3Ptr - (RTR3UINTPTR)pRam->pvR3;
143	if (off < pRam->cb)
144	{
145	PPGMPAGE pPage = &pRam->aPages[off >> PAGE_SHIFT];
146	if (PGM_PAGE_IS_RESERVED(pPage))
147	return VERR_PGM_PHYS_PAGE_RESERVED;
148	*pHCPhys = PGM_PAGE_GET_HCPHYS(pPage)
149	\| (off & PAGE_OFFSET_MASK);
150	return VINF_SUCCESS;
151	}
152	}
153	}
154	return VERR_INVALID_POINTER;
155	#endif
156	}
157
158
159	/**
160	* Converts a HC physical address to a GC physical address.
161	*
162	* Only for the debugger.
163	*
164	* @returns VBox status code
165	* @retval VINF_SUCCESS on success, *pGCPhys is set.
166	* @retval VERR_INVALID_POINTER if the HC physical address is not within the GC physical memory.
167	*
168	* @param pVM The VM handle.
169	* @param HCPhys The HC physical address to convert.
170	* @param pGCPhys Where to store the GC physical address on success.
171	*/
172	VMMR3DECL(int) PGMR3DbgHCPhys2GCPhys(PVM pVM, RTHCPHYS HCPhys, PRTGCPHYS pGCPhys)
173	{
174	/*
175	* Validate and adjust the input a bit.
176	*/
177	if (HCPhys == NIL_RTHCPHYS)
178	return VERR_INVALID_POINTER;
179	unsigned off = HCPhys & PAGE_OFFSET_MASK;
180	HCPhys &= X86_PTE_PAE_PG_MASK;
181	if (HCPhys == 0)
182	return VERR_INVALID_POINTER;
183
184	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
185	pRam;
186	pRam = pRam->CTX_SUFF(pNext))
187	{
188	uint32_t iPage = pRam->cb >> PAGE_SHIFT;
189	while (iPage-- > 0)
190	if ( PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys
191	&& !PGM_PAGE_IS_RESERVED(&pRam->aPages[iPage]))
192	{
193	*pGCPhys = pRam->GCPhys + (iPage << PAGE_SHIFT) + off;
194	return VINF_SUCCESS;
195	}
196	}
197	return VERR_INVALID_POINTER;
198	}
199
200
201	/**
202	* Read physical memory API for the debugger, similar to
203	* PGMPhysSimpleReadGCPhys.
204	*
205	* @returns VBox status code.
206	*
207	* @param pVM The VM handle.
208	* @param pvDst Where to store what's read.
209	* @param GCPhysDst Where to start reading from.
210	* @param cb The number of bytes to attempt reading.
211	* @param fFlags Flags, MBZ.
212	* @param pcbRead For store the actual number of bytes read, pass NULL if
213	* partial reads are unwanted.
214	*/
215	VMMR3DECL(int) PGMR3DbgReadGCPhys(PVM pVM, void pvDst, RTGCPHYS GCPhysSrc, size_t cb, uint32_t fFlags, size_t pcbRead)
216	{
217	/* validate */
218	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
219	AssertReturn(pVM, VERR_INVALID_PARAMETER);
220
221	/* try simple first. */
222	int rc = PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc, cb);
223	if (RT_SUCCESS(rc) \|\| !pcbRead)
224	return rc;
225
226	/* partial read that failed, chop it up in pages. */
227	*pcbRead = 0;
228	size_t const cbReq = cb;
229	rc = VINF_SUCCESS;
230	while (cb > 0)
231	{
232	size_t cbChunk = PAGE_SIZE;
233	cbChunk -= GCPhysSrc & PAGE_OFFSET_MASK;
234	if (cbChunk > cb)
235	cbChunk = cb;
236
237	rc = PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc, cbChunk);
238
239	/* advance */
240	if (RT_FAILURE(rc))
241	break;
242	*pcbRead += cbChunk;
243	cb -= cbChunk;
244	GCPhysSrc += cbChunk;
245	pvDst = (uint8_t *)pvDst + cbChunk;
246	}
247
248	return *pcbRead && RT_FAILURE(rc) ? -rc : rc;
249	}
250
251
252	/**
253	* Write physical memory API for the debugger, similar to
254	* PGMPhysSimpleWriteGCPhys.
255	*
256	* @returns VBox status code.
257	*
258	* @param pVM The VM handle.
259	* @param GCPhysDst Where to start writing.
260	* @param pvSrc What to write.
261	* @param cb The number of bytes to attempt writing.
262	* @param fFlags Flags, MBZ.
263	* @param pcbWritten For store the actual number of bytes written, pass NULL
264	* if partial writes are unwanted.
265	*/
266	VMMR3DECL(int) PGMR3DbgWriteGCPhys(PVM pVM, RTGCPHYS GCPhysDst, const void pvSrc, size_t cb, uint32_t fFlags, size_t pcbWritten)
267	{
268	/* validate */
269	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
270	AssertReturn(pVM, VERR_INVALID_PARAMETER);
271
272	/* try simple first. */
273	int rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysDst, pvSrc, cb);
274	if (RT_SUCCESS(rc) \|\| !pcbWritten)
275	return rc;
276
277	/* partial write that failed, chop it up in pages. */
278	*pcbWritten = 0;
279	rc = VINF_SUCCESS;
280	while (cb > 0)
281	{
282	size_t cbChunk = PAGE_SIZE;
283	cbChunk -= GCPhysDst & PAGE_OFFSET_MASK;
284	if (cbChunk > cb)
285	cbChunk = cb;
286
287	rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysDst, pvSrc, cbChunk);
288
289	/* advance */
290	if (RT_FAILURE(rc))
291	break;
292	*pcbWritten += cbChunk;
293	cb -= cbChunk;
294	GCPhysDst += cbChunk;
295	pvSrc = (uint8_t const *)pvSrc + cbChunk;
296	}
297
298	return *pcbWritten && RT_FAILURE(rc) ? -rc : rc;
299
300	}
301
302
303	/**
304	* Read virtual memory API for the debugger, similar to PGMPhysSimpleReadGCPtr.
305	*
306	* @returns VBox status code.
307	*
308	* @param pVM The VM handle.
309	* @param pvDst Where to store what's read.
310	* @param GCPtrDst Where to start reading from.
311	* @param cb The number of bytes to attempt reading.
312	* @param fFlags Flags, MBZ.
313	* @param pcbRead For store the actual number of bytes read, pass NULL if
314	* partial reads are unwanted.
315	*/
316	VMMR3DECL(int) PGMR3DbgReadGCPtr(PVM pVM, void pvDst, RTGCPTR GCPtrSrc, size_t cb, uint32_t fFlags, size_t pcbRead)
317	{
318	/* validate */
319	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
320	AssertReturn(pVM, VERR_INVALID_PARAMETER);
321
322	/** @todo deal with HMA */
323	/* try simple first. */
324	int rc = PGMPhysSimpleReadGCPtr(pVM, pvDst, GCPtrSrc, cb);
325	if (RT_SUCCESS(rc) \|\| !pcbRead)
326	return rc;
327
328	/* partial read that failed, chop it up in pages. */
329	*pcbRead = 0;
330	rc = VINF_SUCCESS;
331	while (cb > 0)
332	{
333	size_t cbChunk = PAGE_SIZE;
334	cbChunk -= GCPtrSrc & PAGE_OFFSET_MASK;
335	if (cbChunk > cb)
336	cbChunk = cb;
337
338	rc = PGMPhysSimpleReadGCPtr(pVM, pvDst, GCPtrSrc, cbChunk);
339
340	/* advance */
341	if (RT_FAILURE(rc))
342	break;
343	*pcbRead += cbChunk;
344	cb -= cbChunk;
345	GCPtrSrc += cbChunk;
346	pvDst = (uint8_t *)pvDst + cbChunk;
347	}
348
349	return *pcbRead && RT_FAILURE(rc) ? -rc : rc;
350
351	}
352
353
354	/**
355	* Write virtual memory API for the debugger, similar to
356	* PGMPhysSimpleWriteGCPtr.
357	*
358	* @returns VBox status code.
359	*
360	* @param pVM The VM handle.
361	* @param GCPtrDst Where to start writing.
362	* @param pvSrc What to write.
363	* @param cb The number of bytes to attempt writing.
364	* @param fFlags Flags, MBZ.
365	* @param pcbWritten For store the actual number of bytes written, pass NULL
366	* if partial writes are unwanted.
367	*/
368	VMMR3DECL(int) PGMR3DbgWriteGCPtr(PVM pVM, RTGCPTR GCPtrDst, void const pvSrc, size_t cb, uint32_t fFlags, size_t pcbWritten)
369	{
370	/* validate */
371	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
372	AssertReturn(pVM, VERR_INVALID_PARAMETER);
373
374	/** @todo deal with HMA */
375	/* try simple first. */
376	int rc = PGMPhysSimpleWriteGCPtr(pVM, GCPtrDst, pvSrc, cb);
377	if (RT_SUCCESS(rc) \|\| !pcbWritten)
378	return rc;
379
380	/* partial write that failed, chop it up in pages. */
381	*pcbWritten = 0;
382	rc = VINF_SUCCESS;
383	while (cb > 0)
384	{
385	size_t cbChunk = PAGE_SIZE;
386	cbChunk -= GCPtrDst & PAGE_OFFSET_MASK;
387	if (cbChunk > cb)
388	cbChunk = cb;
389
390	rc = PGMPhysSimpleWriteGCPtr(pVM, GCPtrDst, pvSrc, cbChunk);
391
392	/* advance */
393	if (RT_FAILURE(rc))
394	break;
395	*pcbWritten += cbChunk;
396	cb -= cbChunk;
397	GCPtrDst += cbChunk;
398	pvSrc = (uint8_t const *)pvSrc + cbChunk;
399	}
400
401	return *pcbWritten && RT_FAILURE(rc) ? -rc : rc;
402
403	}
404
405
406
407	/**
408	* Scans a page for a byte string, keeping track of potential
409	* cross page matches.
410	*
411	* @returns true and *poff on match.
412	* false on mismatch.
413	* @param pbPage Pointer to the current page.
414	* @param poff Input: The offset into the page.
415	* Output: The page offset of the match on success.
416	* @param cb The number of bytes to search, starting of *poff.
417	* @param pabNeedle The byte string to search for.
418	* @param cbNeedle The length of the byte string.
419	* @param pabPrev The buffer that keeps track of a partial match that we
420	* bring over from the previous page. This buffer must be
421	* at least cbNeedle - 1 big.
422	* @param pcbPrev Input: The number of partial matching bytes from the previous page.
423	* Output: The number of partial matching bytes from this page.
424	* Initialize to 0 before the first call to this function.
425	*/
426	static bool pgmR3DbgScanPage(const uint8_t pbPage, int32_t poff, uint32_t cb,
427	const uint8_t *pabNeedle, size_t cbNeedle,
428	uint8_t pabPrev, size_t pcbPrev)
429	{
430	/*
431	* Try complete any partial match from the previous page.
432	*/
433	if (*pcbPrev > 0)
434	{
435	size_t cbPrev = *pcbPrev;
436	Assert(!*poff);
437	Assert(cbPrev < cbNeedle);
438	if (!memcmp(pbPage, pabNeedle + cbPrev, cbNeedle - cbPrev))
439	{
440	if (cbNeedle - cbPrev > cb)
441	return false;
442	*poff = -(int32_t)cbPrev;
443	return true;
444	}
445
446	/* check out the remainder of the previous page. */
447	const uint8_t *pb = pabPrev;
448	while (cbPrev-- > 0)
449	{
450	pb = (const uint8_t )memchr(pb + 1, pabNeedle, cbPrev);
451	if (!pb)
452	break;
453	cbPrev = *pcbPrev - (pb - pabPrev);
454	if ( !memcmp(pb + 1, &pabNeedle[1], cbPrev - 1)
455	&& !memcmp(pbPage, pabNeedle + cbPrev, cbNeedle - cbPrev))
456	{
457	if (cbNeedle - cbPrev > cb)
458	return false;
459	*poff = -(int32_t)cbPrev;
460	return true;
461	}
462	}
463
464	*pcbPrev = 0;
465	}
466
467	/*
468	* Match the body of the page.
469	*/
470	const uint8_t pb = pbPage + poff;
471	const uint8_t *pbEnd = pb + cb;
472	for (;;)
473	{
474	pb = (const uint8_t )memchr(pb, pabNeedle, cb);
475	if (!pb)
476	break;
477	cb = pbEnd - pb;
478	if (cb >= cbNeedle)
479	{
480	/* match? */
481	if (!memcmp(pb + 1, &pabNeedle[1], cbNeedle - 1))
482	{
483	*poff = pb - pbPage;
484	return true;
485	}
486	}
487	else
488	{
489	/* paritial match at the end of the page? */
490	if (!memcmp(pb + 1, &pabNeedle[1], cb - 1))
491	{
492	/* We're copying one byte more that we really need here, but wtf. */
493	memcpy(pabPrev, pb, cb);
494	*pcbPrev = cb;
495	return false;
496	}
497	}
498
499	/* no match, skip a byte ahead. */
500	if (cb <= 1)
501	break;
502	pb++;
503	cb--;
504	}
505
506	return false;
507	}
508
509
510	/**
511	* Scans guest physical memory for a byte string.
512	*
513	* @returns VBox status codes:
514	* @retval VINF_SUCCESS and *pGCPtrHit on success.
515	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
516	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
517	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
518	*
519	* @param pVM Pointer to the shared VM structure.
520	* @param GCPhys Where to start searching.
521	* @param cbRange The number of bytes to search.
522	* @param pabNeedle The byte string to search for.
523	* @param cbNeedle The length of the byte string. Max 256 bytes.
524	* @param pGCPhysHit Where to store the address of the first occurence on success.
525	*/
526	VMMR3DECL(int) PGMR3DbgScanPhysical(PVM pVM, RTGCPHYS GCPhys, RTGCPHYS cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PRTGCPHYS pGCPhysHit)
527	{
528	/*
529	* Validate and adjust the input a bit.
530	*/
531	if (!VALID_PTR(pGCPhysHit))
532	return VERR_INVALID_POINTER;
533	*pGCPhysHit = NIL_RTGCPHYS;
534
535	if ( !VALID_PTR(pabNeedle)
536	\|\| GCPhys == NIL_RTGCPHYS)
537	return VERR_INVALID_POINTER;
538	if (!cbNeedle)
539	return VERR_INVALID_PARAMETER;
540	if (cbNeedle > MAX_NEEDLE_SIZE)
541	return VERR_INVALID_PARAMETER;
542
543	if (!cbRange)
544	return VERR_DBGF_MEM_NOT_FOUND;
545	if (GCPhys + cbNeedle - 1 < GCPhys)
546	return VERR_DBGF_MEM_NOT_FOUND;
547
548	const RTGCPHYS GCPhysLast = GCPhys + cbRange - 1 >= GCPhys
549	? GCPhys + cbRange - 1
550	: ~(RTGCPHYS)0;
551
552	/*
553	* Search the memory - ignore MMIO and zero pages, also don't
554	* bother to match across ranges.
555	*/
556	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
557	pRam;
558	pRam = pRam->CTX_SUFF(pNext))
559	{
560	/*
561	* If the search range starts prior to the current ram range record,
562	* adjust the search range and possibly conclude the search.
563	*/
564	RTGCPHYS off;
565	if (GCPhys < pRam->GCPhys)
566	{
567	if (GCPhysLast < pRam->GCPhys)
568	break;
569	GCPhys = pRam->GCPhys;
570	off = 0;
571	}
572	else
573	off = GCPhys - pRam->GCPhys;
574	if (off < pRam->cb)
575	{
576	/*
577	* Iterate the relevant pages.
578	*/
579	uint8_t abPrev[MAX_NEEDLE_SIZE];
580	size_t cbPrev = 0;
581	const uint32_t cPages = pRam->cb >> PAGE_SHIFT;
582	for (uint32_t iPage = off >> PAGE_SHIFT; iPage < cPages; iPage++)
583	{
584	PPGMPAGE pPage = &pRam->aPages[iPage];
585	if ( /** @todo !PGM_PAGE_IS_ZERO(pPage)
586	&&*/ !PGM_PAGE_IS_MMIO(pPage))
587	{
588	void const *pvPage;
589	PGMPAGEMAPLOCK Lock;
590	int rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK, &pvPage, &Lock);
591	if (RT_SUCCESS(rc))
592	{
593	int32_t offPage = (GCPhys & PAGE_OFFSET_MASK);
594	uint32_t cbSearch = (GCPhys ^ GCPhysLast) & ~(RTGCPHYS)PAGE_OFFSET_MASK
595	? PAGE_SIZE - (uint32_t)offPage
596	: (GCPhysLast & PAGE_OFFSET_MASK) + 1 - (uint32_t)offPage;
597	bool fRc = pgmR3DbgScanPage((uint8_t const *)pvPage, &offPage, cbSearch,
598	pabNeedle, cbNeedle, &abPrev[0], &cbPrev);
599	PGMPhysReleasePageMappingLock(pVM, &Lock);
600	if (fRc)
601	{
602	*pGCPhysHit = (GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK) + offPage;
603	return VINF_SUCCESS;
604	}
605	}
606	else
607	cbPrev = 0; /* ignore error. */
608	}
609	else
610	cbPrev = 0;
611
612	/* advance to the next page. */
613	GCPhys \|= PAGE_OFFSET_MASK;
614	if (GCPhys++ >= GCPhysLast)
615	return VERR_DBGF_MEM_NOT_FOUND;
616	}
617	}
618	}
619	return VERR_DBGF_MEM_NOT_FOUND;
620	}
621
622
623	/**
624	* Scans (guest) virtual memory for a byte string.
625	*
626	* @returns VBox status codes:
627	* @retval VINF_SUCCESS and *pGCPtrHit on success.
628	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
629	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
630	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
631	*
632	* @param pVM Pointer to the shared VM structure.
633	* @param GCPtr Where to start searching.
634	* @param cbRange The number of bytes to search. Max 256 bytes.
635	* @param pabNeedle The byte string to search for.
636	* @param cbNeedle The length of the byte string.
637	* @param pGCPtrHit Where to store the address of the first occurence on success.
638	*/
639	VMMR3DECL(int) PGMR3DbgScanVirtual(PVM pVM, RTGCPTR GCPtr, RTGCPTR cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PRTGCUINTPTR pGCPtrHit)
640	{
641	/*
642	* Validate and adjust the input a bit.
643	*/
644	if (!VALID_PTR(pGCPtrHit))
645	return VERR_INVALID_POINTER;
646	*pGCPtrHit = 0;
647
648	if (!VALID_PTR(pabNeedle))
649	return VERR_INVALID_POINTER;
650	if (!cbNeedle)
651	return VERR_INVALID_PARAMETER;
652	if (cbNeedle > MAX_NEEDLE_SIZE)
653	return VERR_INVALID_PARAMETER;
654
655	if (!cbRange)
656	return VERR_DBGF_MEM_NOT_FOUND;
657	if (GCPtr + cbNeedle - 1 < GCPtr)
658	return VERR_DBGF_MEM_NOT_FOUND;
659
660	/*
661	* Search the memory - ignore MMIO, zero and not-present pages.
662	*/
663	uint8_t abPrev[MAX_NEEDLE_SIZE];
664	size_t cbPrev = 0;
665	const RTGCPTR GCPtrLast = GCPtr + cbRange - 1 >= GCPtr
666	? GCPtr + cbRange - 1
667	: ~(RTGCPTR)0;
668	RTGCPTR cPages = (((GCPtrLast - GCPtr) + (GCPtr & PAGE_OFFSET_MASK)) >> PAGE_SHIFT) + 1;
669	while (cPages-- > 0)
670	{
671	RTGCPHYS GCPhys;
672	int rc = PGMPhysGCPtr2GCPhys(pVM, GCPtr, &GCPhys);
673	if (RT_SUCCESS(rc))
674	{
675	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
676	if ( pPage
677	///@todo && !PGM_PAGE_IS_ZERO(pPage)
678	&& !PGM_PAGE_IS_MMIO(pPage))
679	{
680	void const *pvPage;
681	PGMPAGEMAPLOCK Lock;
682	rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys & ~(RTGCPTR)PAGE_OFFSET_MASK, &pvPage, &Lock);
683	if (RT_SUCCESS(rc))
684	{
685	int32_t offPage = (GCPtr & PAGE_OFFSET_MASK);
686	uint32_t cbSearch = cPages > 0
687	? PAGE_SIZE - (uint32_t)offPage
688	: (GCPtrLast & PAGE_OFFSET_MASK) + 1 - (uint32_t)offPage;
689	bool fRc = pgmR3DbgScanPage((uint8_t const *)pvPage, &offPage, cbSearch,
690	pabNeedle, cbNeedle, &abPrev[0], &cbPrev);
691	PGMPhysReleasePageMappingLock(pVM, &Lock);
692	if (fRc)
693	{
694	*pGCPtrHit = (GCPtr & ~(RTGCPTR)PAGE_OFFSET_MASK) + offPage;
695	return VINF_SUCCESS;
696	}
697	}
698	else
699	cbPrev = 0; /* ignore error. */
700	}
701	else
702	cbPrev = 0;
703	}
704	else
705	cbPrev = 0; /* ignore error. */
706
707	/* advance to the next page. */
708	GCPtr \|= PAGE_OFFSET_MASK;
709	GCPtr++;
710	}
711	return VERR_DBGF_MEM_NOT_FOUND;
712	}
713

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source: vbox/trunk/src/VBox/VMM/PGMDbg.cpp@ 15941

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