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SELM.cpp

Last change on this file was 98103, checked in by vboxsync, 16 months ago
Copyright year updates by scm.
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1	/* $Id: SELM.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	/** @page pg_selm SELM - The Selector Manager
29	*
30	* SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
31	* of a few hyper selector for the raw-mode context. In the hardware assisted
32	* virtualization mode its only task is to decode entries in the guest GDT or
33	* LDT once in a while.
34	*
35	* @see grp_selm
36	*
37	*
38	* @section seg_selm_shadowing Shadowing
39	*
40	* SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
41	* work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
42	* The idea is to do it in a more on-demand fashion when we get time. There
43	* also a whole bunch of issues with the current synchronization of all three
44	* tables, see notes and todos in the code.
45	*
46	* When the guest makes changes to the GDT we will try update the shadow copy
47	* without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
48	*
49	* When the guest make LDT changes we'll trigger a full resync of the LDT
50	* (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
51	*
52	* The TSS shadowing is limited to the fields we need to care about, namely SS0
53	* and ESP0. The Patch Manager makes use of these. We monitor updates to the
54	* guest TSS and will try keep our SS0 and ESP0 copies up to date this way
55	* rather than go the SELMR3SyncTSS() route.
56	*
57	* When in raw-mode SELM also injects a few extra GDT selectors which are used
58	* by the raw-mode (hyper) context. These start their life at the high end of
59	* the table and will be relocated when the guest tries to make use of them...
60	* Well, that was that idea at least, only the code isn't quite there yet which
61	* is why we have trouble with guests which actually have a full sized GDT.
62	*
63	* So, the summary of the current GDT, LDT and TSS shadowing is that there is a
64	* lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
65	*
66	*/
67
68
69	/*********************************************************************************************************************************
70	* Header Files *
71	*********************************************************************************************************************************/
72	#define LOG_GROUP LOG_GROUP_SELM
73	#include <VBox/vmm/selm.h>
74	#include <VBox/vmm/cpum.h>
75	#include <VBox/vmm/stam.h>
76	#include <VBox/vmm/em.h>
77	#include <VBox/vmm/hm.h>
78	#include <VBox/vmm/mm.h>
79	#include <VBox/vmm/ssm.h>
80	#include <VBox/vmm/pgm.h>
81	#include <VBox/vmm/trpm.h>
82	#include <VBox/vmm/dbgf.h>
83	#include "SELMInternal.h"
84	#include <VBox/vmm/vm.h>
85	#include <VBox/err.h>
86	#include <VBox/param.h>
87
88	#include <iprt/assert.h>
89	#include <VBox/log.h>
90	#include <iprt/asm.h>
91	#include <iprt/string.h>
92	#include <iprt/thread.h>
93	#include <iprt/string.h>
94
95
96	/*********************************************************************************************************************************
97	* Internal Functions *
98	*********************************************************************************************************************************/
99	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
100	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
101	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
102
103
104
105	/**
106	* Initializes the SELM.
107	*
108	* @returns VBox status code.
109	* @param pVM The cross context VM structure.
110	*/
111	VMMR3DECL(int) SELMR3Init(PVM pVM)
112	{
113	int rc;
114	LogFlow(("SELMR3Init\n"));
115
116	/*
117	* Assert alignment and sizes.
118	* (The TSS block requires contiguous back.)
119	*/
120	AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
121	AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_UOFFSETOF(VM, selm.s) & 31));
122
123	/*
124	* Register the saved state data unit.
125	*/
126	rc = SSMR3RegisterStub(pVM, "selm", 1);
127	if (RT_FAILURE(rc))
128	return rc;
129
130	/*
131	* Statistics.
132	*/
133	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelGst, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from guest tables.");
134	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelShw, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedShadow", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from shadow tables.");
135	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelReadErrors, STAMTYPE_COUNTER, "/SELM/LoadHidSel/GstReadErrors", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Guest table read errors.");
136	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelGstNoGood, STAMTYPE_COUNTER, "/SELM/LoadHidSel/NoGoodGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: No good guest table entry.");
137
138	/*
139	* Register info handlers.
140	*/
141	DBGFR3InfoRegisterInternalEx(pVM, "gdt", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest, DBGFINFO_FLAGS_RUN_ON_EMT);
142	DBGFR3InfoRegisterInternalEx(pVM, "ldt", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest, DBGFINFO_FLAGS_RUN_ON_EMT);
143	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest, DBGFINFO_FLAGS_RUN_ON_EMT);
144
145	return rc;
146	}
147
148
149	/**
150	* Applies relocations to data and code managed by this
151	* component. This function will be called at init and
152	* whenever the VMM need to relocate it self inside the GC.
153	*
154	* @param pVM The cross context VM structure.
155	*/
156	VMMR3DECL(void) SELMR3Relocate(PVM pVM)
157	{
158	LogFlow(("SELMR3Relocate\n"));
159	RT_NOREF(pVM);
160	}
161
162
163	/**
164	* Terminates the SELM.
165	*
166	* Termination means cleaning up and freeing all resources,
167	* the VM it self is at this point powered off or suspended.
168	*
169	* @returns VBox status code.
170	* @param pVM The cross context VM structure.
171	*/
172	VMMR3DECL(int) SELMR3Term(PVM pVM)
173	{
174	NOREF(pVM);
175	return VINF_SUCCESS;
176	}
177
178
179	/**
180	* The VM is being reset.
181	*
182	* For the SELM component this means that any GDT/LDT/TSS monitors
183	* needs to be removed.
184	*
185	* @param pVM The cross context VM structure.
186	*/
187	VMMR3DECL(void) SELMR3Reset(PVM pVM)
188	{
189	LogFlow(("SELMR3Reset:\n"));
190	VM_ASSERT_EMT(pVM);
191	RT_NOREF(pVM);
192	}
193
194
195	/**
196	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
197	*
198	* See SELMR3GetSelectorInfo for details.
199	*
200	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
201	*
202	* @param pVCpu The cross context virtual CPU structure.
203	* @param Sel The selector to get info about.
204	* @param pSelInfo Where to store the information.
205	*/
206	static int selmR3GetSelectorInfo64(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
207	{
208	/*
209	* Read it from the guest descriptor table.
210	*/
211	/** @todo this is bogus wrt the LDT/GDT limit on long selectors. */
212	X86DESC64 Desc;
213	RTGCPTR GCPtrDesc;
214	if (!(Sel & X86_SEL_LDT))
215	{
216	/* GDT */
217	VBOXGDTR Gdtr;
218	CPUMGetGuestGDTR(pVCpu, &Gdtr);
219	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
220	return VERR_INVALID_SELECTOR;
221	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
222	}
223	else
224	{
225	/* LDT */
226	uint64_t GCPtrBase;
227	uint32_t cbLimit;
228	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
229	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
230	return VERR_INVALID_SELECTOR;
231
232	/* calc the descriptor location. */
233	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
234	}
235
236	/* read the descriptor. */
237	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
238	if (RT_FAILURE(rc))
239	{
240	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
241	if (RT_FAILURE(rc))
242	return rc;
243	Desc.au64[1] = 0;
244	}
245
246	/*
247	* Extract the base and limit
248	* (We ignore the present bit here, which is probably a bit silly...)
249	*/
250	pSelInfo->Sel = Sel;
251	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
252	pSelInfo->u.Raw64 = Desc;
253	if (Desc.Gen.u1DescType)
254	{
255	/*
256	* 64-bit code selectors are wide open, it's not possible to detect
257	* 64-bit data or stack selectors without also dragging in assumptions
258	* about current CS (i.e. that's we're executing in 64-bit mode). So,
259	* the selinfo user needs to deal with this in the context the info is
260	* used unfortunately.
261	*/
262	if ( Desc.Gen.u1Long
263	&& !Desc.Gen.u1DefBig
264	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
265	{
266	/* Note! We ignore the segment limit hacks that was added by AMD. */
267	pSelInfo->GCPtrBase = 0;
268	pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
269	}
270	else
271	{
272	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
273	pSelInfo->GCPtrBase = X86DESC_BASE(&Desc);
274	}
275	pSelInfo->SelGate = 0;
276	}
277	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
278	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
279	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
280	{
281	/* Note. LDT descriptors are weird in long mode, we ignore the footnote
282	in the AMD manual here as a simplification. */
283	pSelInfo->GCPtrBase = X86DESC64_BASE(&Desc);
284	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
285	pSelInfo->SelGate = 0;
286	}
287	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
288	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
289	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
290	{
291	pSelInfo->cbLimit = X86DESC64_BASE(&Desc);
292	pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
293	\| ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
294	\| ((uint64_t)Desc.Gate.u32OffsetTop << 32);
295	pSelInfo->SelGate = Desc.Gate.u16Sel;
296	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
297	}
298	else
299	{
300	pSelInfo->cbLimit = 0;
301	pSelInfo->GCPtrBase = 0;
302	pSelInfo->SelGate = 0;
303	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
304	}
305	if (!Desc.Gen.u1Present)
306	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
307
308	return VINF_SUCCESS;
309	}
310
311
312	/**
313	* Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
314	* interprets a legacy descriptor table entry and fills in the selector info
315	* structure from it.
316	*
317	* @param pSelInfo Where to store the selector info. Only the fFlags and
318	* Sel members have been initialized.
319	* @param pDesc The legacy descriptor to parse.
320	*/
321	DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
322	{
323	pSelInfo->u.Raw64.au64[1] = 0;
324	pSelInfo->u.Raw = *pDesc;
325	if ( pDesc->Gen.u1DescType
326	\|\| !(pDesc->Gen.u4Type & 4))
327	{
328	pSelInfo->cbLimit = X86DESC_LIMIT_G(pDesc);
329	pSelInfo->GCPtrBase = X86DESC_BASE(pDesc);
330	pSelInfo->SelGate = 0;
331	}
332	else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
333	{
334	pSelInfo->cbLimit = 0;
335	if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
336	pSelInfo->GCPtrBase = 0;
337	else
338	pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
339	\| (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
340	pSelInfo->SelGate = pDesc->Gate.u16Sel;
341	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
342	}
343	else
344	{
345	pSelInfo->cbLimit = 0;
346	pSelInfo->GCPtrBase = 0;
347	pSelInfo->SelGate = 0;
348	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
349	}
350	if (!pDesc->Gen.u1Present)
351	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
352	}
353
354
355	/**
356	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
357	*
358	* See SELMR3GetSelectorInfo for details.
359	*
360	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
361	*
362	* @param pVCpu The cross context virtual CPU structure.
363	* @param Sel The selector to get info about.
364	* @param pSelInfo Where to store the information.
365	*/
366	static int selmR3GetSelectorInfo32(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
367	{
368	/*
369	* Read the descriptor entry
370	*/
371	pSelInfo->fFlags = 0;
372	if (CPUMIsGuestInProtectedMode(pVCpu))
373	{
374	/*
375	* Read it from the guest descriptor table.
376	*/
377	pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
378
379	RTGCPTR GCPtrDesc;
380	if (!(Sel & X86_SEL_LDT))
381	{
382	/* GDT */
383	VBOXGDTR Gdtr;
384	CPUMGetGuestGDTR(pVCpu, &Gdtr);
385	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
386	return VERR_INVALID_SELECTOR;
387	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
388	}
389	else
390	{
391	/* LDT */
392	uint64_t GCPtrBase;
393	uint32_t cbLimit;
394	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
395	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
396	return VERR_INVALID_SELECTOR;
397
398	/* calc the descriptor location. */
399	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
400	}
401
402	/* read the descriptor. */
403	X86DESC Desc;
404	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
405	if (RT_SUCCESS(rc))
406	{
407	/*
408	* Extract the base and limit or sel:offset for gates.
409	*/
410	pSelInfo->Sel = Sel;
411	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
412
413	return VINF_SUCCESS;
414	}
415	return rc;
416	}
417
418	/*
419	* We're in real mode.
420	*/
421	pSelInfo->Sel = Sel;
422	pSelInfo->GCPtrBase = Sel << 4;
423	pSelInfo->cbLimit = 0xffff;
424	pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
425	pSelInfo->u.Raw64.au64[0] = 0;
426	pSelInfo->u.Raw64.au64[1] = 0;
427	pSelInfo->SelGate = 0;
428	return VINF_SUCCESS;
429	}
430
431
432	/**
433	* Gets information about a selector.
434	*
435	* Intended for the debugger mostly and will prefer the guest descriptor tables
436	* over the shadow ones.
437	*
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	* @returns Other VBox status code on other errors.
447	*
448	* @param pVCpu The cross context virtual CPU structure.
449	* @param Sel The selector to get info about.
450	* @param pSelInfo Where to store the information.
451	*/
452	VMMR3DECL(int) SELMR3GetSelectorInfo(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
453	{
454	AssertPtr(pSelInfo);
455	if (CPUMIsGuestInLongMode(pVCpu))
456	return selmR3GetSelectorInfo64(pVCpu, Sel, pSelInfo);
457	return selmR3GetSelectorInfo32(pVCpu, Sel, pSelInfo);
458	}
459
460
461	/**
462	* Formats a descriptor.
463	*
464	* @param Desc Descriptor to format.
465	* @param Sel Selector number.
466	* @param pszOutput Output buffer.
467	* @param cchOutput Size of output buffer.
468	*/
469	static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
470	{
471	/*
472	* Make variable description string.
473	*/
474	static struct
475	{
476	unsigned cch;
477	const char *psz;
478	} const aTypes[32] =
479	{
480	#define STRENTRY(str) { sizeof(str) - 1, str }
481	/* system */
482	STRENTRY("Reserved0 "), /* 0x00 */
483	STRENTRY("TSS16Avail "), /* 0x01 */
484	STRENTRY("LDT "), /* 0x02 */
485	STRENTRY("TSS16Busy "), /* 0x03 */
486	STRENTRY("Call16 "), /* 0x04 */
487	STRENTRY("Task "), /* 0x05 */
488	STRENTRY("Int16 "), /* 0x06 */
489	STRENTRY("Trap16 "), /* 0x07 */
490	STRENTRY("Reserved8 "), /* 0x08 */
491	STRENTRY("TSS32Avail "), /* 0x09 */
492	STRENTRY("ReservedA "), /* 0x0a */
493	STRENTRY("TSS32Busy "), /* 0x0b */
494	STRENTRY("Call32 "), /* 0x0c */
495	STRENTRY("ReservedD "), /* 0x0d */
496	STRENTRY("Int32 "), /* 0x0e */
497	STRENTRY("Trap32 "), /* 0x0f */
498	/* non system */
499	STRENTRY("DataRO "), /* 0x10 */
500	STRENTRY("DataRO Accessed "), /* 0x11 */
501	STRENTRY("DataRW "), /* 0x12 */
502	STRENTRY("DataRW Accessed "), /* 0x13 */
503	STRENTRY("DataDownRO "), /* 0x14 */
504	STRENTRY("DataDownRO Accessed "), /* 0x15 */
505	STRENTRY("DataDownRW "), /* 0x16 */
506	STRENTRY("DataDownRW Accessed "), /* 0x17 */
507	STRENTRY("CodeEO "), /* 0x18 */
508	STRENTRY("CodeEO Accessed "), /* 0x19 */
509	STRENTRY("CodeER "), /* 0x1a */
510	STRENTRY("CodeER Accessed "), /* 0x1b */
511	STRENTRY("CodeConfEO "), /* 0x1c */
512	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
513	STRENTRY("CodeConfER "), /* 0x1e */
514	STRENTRY("CodeConfER Accessed ") /* 0x1f */
515	#undef SYSENTRY
516	};
517	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
518	char szMsg[128];
519	char *psz = &szMsg[0];
520	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
521	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
522	psz += aTypes[i].cch;
523
524	if (Desc.Gen.u1Present)
525	ADD_STR(psz, "Present ");
526	else
527	ADD_STR(psz, "Not-Present ");
528	if (Desc.Gen.u1Granularity)
529	ADD_STR(psz, "Page ");
530	if (Desc.Gen.u1DefBig)
531	ADD_STR(psz, "32-bit ");
532	else
533	ADD_STR(psz, "16-bit ");
534	#undef ADD_STR
535	*psz = '\0';
536
537	/*
538	* Limit and Base and format the output.
539	*/
540	uint32_t u32Limit = X86DESC_LIMIT_G(&Desc);
541	uint32_t u32Base = X86DESC_BASE(&Desc);
542
543	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
544	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
545	}
546
547
548	/**
549	* Dumps a descriptor.
550	*
551	* @param Desc Descriptor to dump.
552	* @param Sel Selector number.
553	* @param pszMsg Message to prepend the log entry with.
554	*/
555	VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
556	{
557	#ifdef LOG_ENABLED
558	if (LogIsEnabled())
559	{
560	char szOutput[128];
561	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
562	Log(("%s: %s\n", pszMsg, szOutput));
563	}
564	#else
565	RT_NOREF3(Desc, Sel, pszMsg);
566	#endif
567	}
568
569
570	/**
571	* Display the guest gdt.
572	*
573	* @param pVM The cross context VM structure.
574	* @param pHlp The info helpers.
575	* @param pszArgs Arguments, ignored.
576	*/
577	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
578	{
579	/** @todo SMP support! */
580	PVMCPU pVCpu = VMMGetCpu(pVM);
581	CPUMImportGuestStateOnDemand(pVCpu, CPUMCTX_EXTRN_CR0 \| CPUMCTX_EXTRN_CR3 \| CPUMCTX_EXTRN_CR4
582	\| CPUMCTX_EXTRN_EFER \| CPUMCTX_EXTRN_GDTR);
583
584	VBOXGDTR GDTR;
585	CPUMGetGuestGDTR(pVCpu, &GDTR);
586	RTGCPTR GCPtrGDT = GDTR.pGdt;
587	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
588
589	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
590	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
591	{
592	X86DESC GDTE;
593	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
594	if (RT_SUCCESS(rc))
595	{
596	if (GDTE.Gen.u1Present)
597	{
598	char szOutput[128];
599	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
600	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
601	}
602	}
603	else if (rc == VERR_PAGE_NOT_PRESENT)
604	{
605	if ((GCPtrGDT & GUEST_PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
606	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
607	}
608	else
609	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
610	}
611	NOREF(pszArgs);
612	}
613
614
615	/**
616	* Display the guest ldt.
617	*
618	* @param pVM The cross context VM structure.
619	* @param pHlp The info helpers.
620	* @param pszArgs Arguments, ignored.
621	*/
622	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
623	{
624	/** @todo SMP support! */
625	PVMCPU pVCpu = VMMGetCpu(pVM);
626	CPUMImportGuestStateOnDemand(pVCpu, CPUMCTX_EXTRN_CR0 \| CPUMCTX_EXTRN_CR3 \| CPUMCTX_EXTRN_CR4
627	\| CPUMCTX_EXTRN_EFER \| CPUMCTX_EXTRN_GDTR \| CPUMCTX_EXTRN_LDTR);
628
629	uint64_t GCPtrLdt;
630	uint32_t cbLdt;
631	RTSEL SelLdt = CPUMGetGuestLdtrEx(pVCpu, &GCPtrLdt, &cbLdt);
632	if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
633	{
634	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
635	return;
636	}
637
638	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RX64 limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
639	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
640	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
641	{
642	X86DESC LdtE;
643	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
644	if (RT_SUCCESS(rc))
645	{
646	if (LdtE.Gen.u1Present)
647	{
648	char szOutput[128];
649	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
650	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
651	}
652	}
653	else if (rc == VERR_PAGE_NOT_PRESENT)
654	{
655	if ((GCPtrLdt & GUEST_PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
656	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, GCPtrLdt);
657	}
658	else
659	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, GCPtrLdt);
660	}
661	NOREF(pszArgs);
662	}
663
664
665	/**
666	* Dumps the guest GDT
667	*
668	* @param pVM The cross context VM structure.
669	*/
670	VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
671	{
672	DBGFR3Info(pVM->pUVM, "gdt", NULL, NULL);
673	}
674
675
676	/**
677	* Dumps the guest LDT
678	*
679	* @param pVM The cross context VM structure.
680	*/
681	VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
682	{
683	DBGFR3Info(pVM->pUVM, "ldt", NULL, NULL);
684	}
685

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source: vbox/trunk/src/VBox/VMM/VMMR3/SELM.cpp

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