PGMDbg.cpp@ 11043

Last change on this file since 11043 was 8155, checked in by vboxsync, 17 years ago
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1	/* $Id: PGMDbg.cpp 8155 2008-04-18 15:16:47Z 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 HC 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 HCPtr The HC pointer to convert.
53	* @param pGCPhys Where to store the GC physical address on success.
54	*/
55	PGMR3DECL(int) PGMR3DbgHCPtr2GCPhys(PVM pVM, RTHCPTR HCPtr, 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 = CTXALLSUFF(pVM->pgm.s.pRamRanges);
63	pRam;
64	pRam = CTXALLSUFF(pRam->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 (CTXSUFF(pRam->pavHCChunk)[iChunk])
71	{
72	RTHCUINTPTR off = (RTHCUINTPTR)HCPtr - (RTHCUINTPTR)CTXSUFF(pRam->pavHCChunk)[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->pvHC)
82	{
83	RTHCUINTPTR off = (RTHCUINTPTR)HCPtr - (RTHCUINTPTR)pRam->pvHC;
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 HC pointer to a GC physical address.
98	*
99	* @returns VBox status code.
100	* @retval VINF_SUCCESS on success, *pHCPhys is set.
101	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical page but has no physical backing.
102	* @retval VERR_INVALID_POINTER if the pointer is not within the GC physical memory.
103	*
104	* @param pVM The VM handle.
105	* @param HCPtr The HC pointer to convert.
106	* @param pHCPhys Where to store the HC physical address on success.
107	*/
108	PGMR3DECL(int) PGMR3DbgHCPtr2HCPhys(PVM pVM, RTHCPTR HCPtr, PRTHCPHYS pHCPhys)
109	{
110	#ifdef VBOX_WITH_NEW_PHYS_CODE
111	*pHCPhys = NIL_RTHCPHYS;
112	return VERR_NOT_IMPLEMENTED;
113
114	#else
115	for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
116	pRam;
117	pRam = CTXALLSUFF(pRam->pNext))
118	{
119	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
120	{
121	for (unsigned iChunk = 0; iChunk < (pRam->cb >> PGM_DYNAMIC_CHUNK_SHIFT); iChunk++)
122	{
123	if (CTXSUFF(pRam->pavHCChunk)[iChunk])
124	{
125	RTHCUINTPTR off = (RTHCUINTPTR)HCPtr - (RTHCUINTPTR)CTXSUFF(pRam->pavHCChunk)[iChunk];
126	if (off < PGM_DYNAMIC_CHUNK_SIZE)
127	{
128	PPGMPAGE pPage = &pRam->aPages[off >> PAGE_SHIFT];
129	if (PGM_PAGE_IS_RESERVED(pPage))
130	return VERR_PGM_PHYS_PAGE_RESERVED;
131	*pHCPhys = PGM_PAGE_GET_HCPHYS(pPage)
132	\| (off & PAGE_OFFSET_MASK);
133	return VINF_SUCCESS;
134	}
135	}
136	}
137	}
138	else if (pRam->pvHC)
139	{
140	RTHCUINTPTR off = (RTHCUINTPTR)HCPtr - (RTHCUINTPTR)pRam->pvHC;
141	if (off < pRam->cb)
142	{
143	PPGMPAGE pPage = &pRam->aPages[off >> PAGE_SHIFT];
144	if (PGM_PAGE_IS_RESERVED(pPage))
145	return VERR_PGM_PHYS_PAGE_RESERVED;
146	*pHCPhys = PGM_PAGE_GET_HCPHYS(pPage)
147	\| (off & PAGE_OFFSET_MASK);
148	return VINF_SUCCESS;
149	}
150	}
151	}
152	return VERR_INVALID_POINTER;
153	#endif
154	}
155
156
157	/**
158	* Converts a HC physical address to a GC physical address.
159	*
160	* Only for the debugger.
161	*
162	* @returns VBox status code
163	* @retval VINF_SUCCESS on success, *pGCPhys is set.
164	* @retval VERR_INVALID_POINTER if the HC physical address is not within the GC physical memory.
165	*
166	* @param pVM The VM handle.
167	* @param HCPhys The HC physical address to convert.
168	* @param pGCPhys Where to store the GC physical address on success.
169	*/
170	PGMR3DECL(int) PGMR3DbgHCPhys2GCPhys(PVM pVM, RTHCPHYS HCPhys, PRTGCPHYS pGCPhys)
171	{
172	/*
173	* Validate and adjust the input a bit.
174	*/
175	if (HCPhys == NIL_RTHCPHYS)
176	return VERR_INVALID_POINTER;
177	unsigned off = HCPhys & PAGE_OFFSET_MASK;
178	HCPhys &= X86_PTE_PAE_PG_MASK;
179	if (HCPhys == 0)
180	return VERR_INVALID_POINTER;
181
182	for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
183	pRam;
184	pRam = CTXALLSUFF(pRam->pNext))
185	{
186	uint32_t iPage = pRam->cb >> PAGE_SHIFT;
187	while (iPage-- > 0)
188	if ( PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys
189	&& !PGM_PAGE_IS_RESERVED(&pRam->aPages[iPage]))
190	{
191	*pGCPhys = pRam->GCPhys + (iPage << PAGE_SHIFT) + off;
192	return VINF_SUCCESS;
193	}
194	}
195	return VERR_INVALID_POINTER;
196	}
197
198
199	/**
200	* Scans a page for a byte string, keeping track of potential
201	* cross page matches.
202	*
203	* @returns true and *poff on match.
204	* false on mismatch.
205	* @param pbPage Pointer to the current page.
206	* @param poff Input: The offset into the page.
207	* Output: The page offset of the match on success.
208	* @param cb The number of bytes to search, starting of *poff.
209	* @param pabNeedle The byte string to search for.
210	* @param cbNeedle The length of the byte string.
211	* @param pabPrev The buffer that keeps track of a partial match that we
212	* bring over from the previous page. This buffer must be
213	* at least cbNeedle - 1 big.
214	* @param pcbPrev Input: The number of partial matching bytes from the previous page.
215	* Output: The number of partial matching bytes from this page.
216	* Initialize to 0 before the first call to this function.
217	*/
218	static bool pgmR3DbgScanPage(const uint8_t pbPage, int32_t poff, uint32_t cb,
219	const uint8_t *pabNeedle, size_t cbNeedle,
220	uint8_t pabPrev, size_t pcbPrev)
221	{
222	/*
223	* Try complete any partial match from the previous page.
224	*/
225	if (*pcbPrev > 0)
226	{
227	size_t cbPrev = *pcbPrev;
228	Assert(!*poff);
229	Assert(cbPrev < cbNeedle);
230	if (!memcmp(pbPage, pabNeedle + cbPrev, cbNeedle - cbPrev))
231	{
232	if (cbNeedle - cbPrev > cb)
233	return false;
234	*poff = -(int32_t)cbPrev;
235	return true;
236	}
237
238	/* check out the remainder of the previous page. */
239	const uint8_t *pb = pabPrev;
240	while (cbPrev-- > 0)
241	{
242	pb = (const uint8_t )memchr(pb + 1, pabNeedle, cbPrev);
243	if (!pb)
244	break;
245	cbPrev = *pcbPrev - (pb - pabPrev);
246	if ( !memcmp(pb + 1, &pabNeedle[1], cbPrev - 1)
247	&& !memcmp(pbPage, pabNeedle + cbPrev, cbNeedle - cbPrev))
248	{
249	if (cbNeedle - cbPrev > cb)
250	return false;
251	*poff = -(int32_t)cbPrev;
252	return true;
253	}
254	}
255
256	*pcbPrev = 0;
257	}
258
259	/*
260	* Match the body of the page.
261	*/
262	const uint8_t pb = pbPage + poff;
263	const uint8_t *pbEnd = pb + cb;
264	for (;;)
265	{
266	pb = (const uint8_t )memchr(pb, pabNeedle, cb);
267	if (!pb)
268	break;
269	cb = pbEnd - pb;
270	if (cb >= cbNeedle)
271	{
272	/* match? */
273	if (!memcmp(pb + 1, &pabNeedle[1], cbNeedle - 1))
274	{
275	*poff = pb - pbPage;
276	return true;
277	}
278	}
279	else
280	{
281	/* paritial match at the end of the page? */
282	if (!memcmp(pb + 1, &pabNeedle[1], cb - 1))
283	{
284	/* We're copying one byte more that we really need here, but wtf. */
285	memcpy(pabPrev, pb, cb);
286	*pcbPrev = cb;
287	return false;
288	}
289	}
290
291	/* no match, skip a byte ahead. */
292	if (cb <= 1)
293	break;
294	pb++;
295	cb--;
296	}
297
298	return false;
299	}
300
301
302	/**
303	* Scans guest physical memory for a byte string.
304	*
305	* @returns VBox status codes:
306	* @retval VINF_SUCCESS and *pGCPtrHit on success.
307	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
308	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
309	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
310	*
311	* @param pVM Pointer to the shared VM structure.
312	* @param GCPhys Where to start searching.
313	* @param cbRange The number of bytes to search.
314	* @param pabNeedle The byte string to search for.
315	* @param cbNeedle The length of the byte string. Max 256 bytes.
316	* @param pGCPhysHit Where to store the address of the first occurence on success.
317	*/
318	PDMR3DECL(int) PGMR3DbgScanPhysical(PVM pVM, RTGCPHYS GCPhys, RTGCPHYS cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PRTGCPHYS pGCPhysHit)
319	{
320	/*
321	* Validate and adjust the input a bit.
322	*/
323	if (!VALID_PTR(pGCPhysHit))
324	return VERR_INVALID_POINTER;
325	*pGCPhysHit = NIL_RTGCPHYS;
326
327	if ( !VALID_PTR(pabNeedle)
328	\|\| GCPhys == NIL_RTGCPHYS)
329	return VERR_INVALID_POINTER;
330	if (!cbNeedle)
331	return VERR_INVALID_PARAMETER;
332	if (cbNeedle > MAX_NEEDLE_SIZE)
333	return VERR_INVALID_PARAMETER;
334
335	if (!cbRange)
336	return VERR_DBGF_MEM_NOT_FOUND;
337	if (GCPhys + cbNeedle - 1 < GCPhys)
338	return VERR_DBGF_MEM_NOT_FOUND;
339
340	const RTGCPHYS GCPhysLast = GCPhys + cbRange - 1 >= GCPhys
341	? GCPhys + cbRange - 1
342	: ~(RTGCPHYS)0;
343
344	/*
345	* Search the memory - ignore MMIO and zero pages, also don't
346	* bother to match across ranges.
347	*/
348	for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
349	pRam;
350	pRam = CTXALLSUFF(pRam->pNext))
351	{
352	/*
353	* If the search range starts prior to the current ram range record,
354	* adjust the search range and possibly conclude the search.
355	*/
356	RTGCPHYS off;
357	if (GCPhys < pRam->GCPhys)
358	{
359	if (GCPhysLast < pRam->GCPhys)
360	break;
361	GCPhys = pRam->GCPhys;
362	off = 0;
363	}
364	else
365	off = GCPhys - pRam->GCPhys;
366	if (off < pRam->cb)
367	{
368	/*
369	* Iterate the relevant pages.
370	*/
371	uint8_t abPrev[MAX_NEEDLE_SIZE];
372	size_t cbPrev = 0;
373	const uint32_t cPages = pRam->cb >> PAGE_SHIFT;
374	for (uint32_t iPage = off >> PAGE_SHIFT; iPage < cPages; iPage++)
375	{
376	PPGMPAGE pPage = &pRam->aPages[iPage];
377	if ( /** @todo !PGM_PAGE_IS_ZERO(pPage)
378	&&*/ !PGM_PAGE_IS_MMIO(pPage))
379	{
380	void const *pvPage;
381	PGMPAGEMAPLOCK Lock;
382	int rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK, &pvPage, &Lock);
383	if (RT_SUCCESS(rc))
384	{
385	int32_t offPage = (GCPhys & PAGE_OFFSET_MASK);
386	uint32_t cbSearch = (GCPhys ^ GCPhysLast) & ~(RTGCPHYS)PAGE_OFFSET_MASK
387	? PAGE_SIZE - (uint32_t)offPage
388	: (GCPhysLast & PAGE_OFFSET_MASK) + 1 - (uint32_t)offPage;
389	bool fRc = pgmR3DbgScanPage((uint8_t const *)pvPage, &offPage, cbSearch,
390	pabNeedle, cbNeedle, &abPrev[0], &cbPrev);
391	PGMPhysReleasePageMappingLock(pVM, &Lock);
392	if (fRc)
393	{
394	*pGCPhysHit = (GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK) + offPage;
395	return VINF_SUCCESS;
396	}
397	}
398	else
399	cbPrev = 0; /* ignore error. */
400	}
401	else
402	cbPrev = 0;
403
404	/* advance to the the next page. */
405	GCPhys \|= PAGE_OFFSET_MASK;
406	if (GCPhys++ >= GCPhysLast)
407	return VERR_DBGF_MEM_NOT_FOUND;
408	}
409	}
410	}
411	return VERR_DBGF_MEM_NOT_FOUND;
412	}
413
414
415	/**
416	* Scans (guest) virtual memory for a byte string.
417	*
418	* @returns VBox status codes:
419	* @retval VINF_SUCCESS and *pGCPtrHit on success.
420	* @retval VERR_DBGF_MEM_NOT_FOUND if not found.
421	* @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
422	* @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
423	*
424	* @param pVM Pointer to the shared VM structure.
425	* @param GCPtr Where to start searching.
426	* @param cbRange The number of bytes to search. Max 256 bytes.
427	* @param pabNeedle The byte string to search for.
428	* @param cbNeedle The length of the byte string.
429	* @param pGCPtrHit Where to store the address of the first occurence on success.
430	*/
431	PDMR3DECL(int) PGMR3DbgScanVirtual(PVM pVM, RTGCUINTPTR GCPtr, RTGCUINTPTR cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PRTGCUINTPTR pGCPtrHit)
432	{
433	/*
434	* Validate and adjust the input a bit.
435	*/
436	if (!VALID_PTR(pGCPtrHit))
437	return VERR_INVALID_POINTER;
438	*pGCPtrHit = 0;
439
440	if (!VALID_PTR(pabNeedle))
441	return VERR_INVALID_POINTER;
442	if (!cbNeedle)
443	return VERR_INVALID_PARAMETER;
444	if (cbNeedle > MAX_NEEDLE_SIZE)
445	return VERR_INVALID_PARAMETER;
446
447	if (!cbRange)
448	return VERR_DBGF_MEM_NOT_FOUND;
449	if (GCPtr + cbNeedle - 1 < GCPtr)
450	return VERR_DBGF_MEM_NOT_FOUND;
451
452	/*
453	* Search the memory - ignore MMIO, zero and not-present pages.
454	*/
455	uint8_t abPrev[MAX_NEEDLE_SIZE];
456	size_t cbPrev = 0;
457	const RTGCUINTPTR GCPtrLast = GCPtr + cbRange - 1 >= GCPtr
458	? GCPtr + cbRange - 1
459	: ~(RTGCUINTPTR)0;
460	RTGCUINTPTR cPages = (((GCPtrLast - GCPtr) + (GCPtr & PAGE_OFFSET_MASK)) >> PAGE_SHIFT) + 1;
461	while (cPages-- > 0)
462	{
463	RTGCPHYS GCPhys;
464	int rc = PGMPhysGCPtr2GCPhys(pVM, GCPtr, &GCPhys);
465	if (RT_SUCCESS(rc))
466	{
467	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
468	if ( pPage
469	///@todo && !PGM_PAGE_IS_ZERO(pPage)
470	&& !PGM_PAGE_IS_MMIO(pPage))
471	{
472	void const *pvPage;
473	PGMPAGEMAPLOCK Lock;
474	rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys & ~(RTGCUINTPTR)PAGE_OFFSET_MASK, &pvPage, &Lock);
475	if (RT_SUCCESS(rc))
476	{
477	int32_t offPage = (GCPtr & PAGE_OFFSET_MASK);
478	uint32_t cbSearch = cPages > 0
479	? PAGE_SIZE - (uint32_t)offPage
480	: (GCPtrLast & PAGE_OFFSET_MASK) + 1 - (uint32_t)offPage;
481	bool fRc = pgmR3DbgScanPage((uint8_t const *)pvPage, &offPage, cbSearch,
482	pabNeedle, cbNeedle, &abPrev[0], &cbPrev);
483	PGMPhysReleasePageMappingLock(pVM, &Lock);
484	if (fRc)
485	{
486	*pGCPtrHit = (GCPtr & ~(RTGCUINTPTR)PAGE_OFFSET_MASK) + offPage;
487	return VINF_SUCCESS;
488	}
489	}
490	else
491	cbPrev = 0; /* ignore error. */
492	}
493	else
494	cbPrev = 0;
495	}
496	else
497	cbPrev = 0; /* ignore error. */
498
499	/* advance to the the next page. */
500	GCPtr \|= PAGE_OFFSET_MASK;
501	GCPtr++;
502	}
503	return VERR_DBGF_MEM_NOT_FOUND;
504	}
505

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