SELMAll.cpp@ 2017

Last change on this file since 2017 was 2009, checked in by vboxsync, 18 years ago
Fixed segment limit calculation for expand-down segments.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 23.6 KB

Line
1	/* $Id: SELMAll.cpp 2009 2007-04-10 14:19:40Z vboxsync $ */
2	/** @file
3	* SELM All contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_SELM
27	#include <VBox/selm.h>
28	#include <VBox/stam.h>
29	#include <VBox/mm.h>
30	#include <VBox/pgm.h>
31	#include "SELMInternal.h"
32	#include <VBox/vm.h>
33	#include <VBox/x86.h>
34	#include <VBox/err.h>
35	#include <VBox/param.h>
36	#include <iprt/assert.h>
37	#include <VBox/log.h>
38
39
40
41	/**
42	* Converts a GC selector based address to a flat address.
43	*
44	* No limit checks are done. Use the SELMToFlat() or SELMValidate() functions
45	* for that.
46	*
47	* @returns Flat address.
48	* @param pVM VM Handle.
49	* @param Sel Selector part.
50	* @param Addr Address part.
51	*/
52	static RTGCPTR selmToFlat(PVM pVM, RTSEL Sel, RTGCPTR Addr)
53	{
54	Assert(!CPUMAreHiddenSelRegsValid(pVM));
55
56	/** @todo check the limit. */
57	VBOXDESC Desc;
58	if (!(Sel & X86_SEL_LDT))
59	Desc = pVM->selm.s.CTXSUFF(paGdt)[Sel >> X86_SEL_SHIFT];
60	else
61	{
62	/** @todo handle LDT pages not present! */
63	#ifdef IN_GC
64	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.GCPtrLdt + pVM->selm.s.offLdtHyper);
65	#else
66	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.HCPtrLdt + pVM->selm.s.offLdtHyper);
67	#endif
68	Desc = paLDT[Sel >> X86_SEL_SHIFT];
69	}
70
71	return (RTGCPTR)( (RTGCUINTPTR)Addr
72	+ ( (Desc.Gen.u8BaseHigh2 << 24)
73	\| (Desc.Gen.u8BaseHigh1 << 16)
74	\| Desc.Gen.u16BaseLow));
75	}
76
77
78	/**
79	* Converts a GC selector based address to a flat address.
80	*
81	* No limit checks are done. Use the SELMToFlat() or SELMValidate() functions
82	* for that.
83	*
84	* @returns Flat address.
85	* @param pVM VM Handle.
86	* @param eflags Current eflags
87	* @param Sel Selector part.
88	* @param Addr Address part.
89	*/
90	SELMDECL(RTGCPTR) SELMToFlat(PVM pVM, X86EFLAGS eflags, RTSEL Sel, CPUMSELREGHID *pHiddenSel, RTGCPTR Addr)
91	{
92	/*
93	* Deal with real & v86 mode first.
94	*/
95	if ( CPUMIsGuestInRealMode(pVM)
96	\|\| eflags.Bits.u1VM)
97	{
98	RTGCUINTPTR uFlat = ((RTGCUINTPTR)Addr & 0xffff) + ((RTGCUINTPTR)Sel << 4);
99	return (RTGCPTR)uFlat;
100	}
101
102	if (!CPUMAreHiddenSelRegsValid(pVM))
103	return selmToFlat(pVM, Sel, Addr);
104
105	return (RTGCPTR)(pHiddenSel->u32Base + (RTGCUINTPTR)Addr);
106	}
107
108
109	/**
110	* Converts a GC selector based address to a flat address.
111	*
112	* Some basic checking is done, but not all kinds yet.
113	*
114	* @returns VBox status
115	* @param pVM VM Handle.
116	* @param eflags Current eflags
117	* @param Sel Selector part.
118	* @param Addr Address part.
119	* @param fFlags SELMTOFLAT_FLAGS_*
120	* GDT entires are valid.
121	* @param ppvGC Where to store the GC flat address.
122	* @param pcb Where to store the bytes from *ppvGC which can be accessed according to
123	* the selector. NULL is allowed.
124	*/
125	SELMDECL(int) SELMToFlatEx(PVM pVM, X86EFLAGS eflags, RTSEL Sel, RTGCPTR Addr, unsigned fFlags, PRTGCPTR ppvGC, uint32_t *pcb)
126	{
127	/*
128	* Deal with real & v86 mode first.
129	*/
130	if ( CPUMIsGuestInRealMode(pVM)
131	\|\| eflags.Bits.u1VM)
132	{
133	if (pcb)
134	*pcb = 0x10000 - ((RTGCUINTPTR)Addr & 0xffff);
135	if (ppvGC)
136	{
137	RTGCUINTPTR uFlat = ((RTGCUINTPTR)Addr & 0xffff) + ((RTGCUINTPTR)Sel << 4);
138	*ppvGC = (RTGCPTR)uFlat;
139	}
140	return VINF_SUCCESS;
141	}
142
143	Assert(!CPUMAreHiddenSelRegsValid(pVM));
144
145	VBOXDESC Desc;
146	if (!(Sel & X86_SEL_LDT))
147	{
148	if ( !(fFlags & SELMTOFLAT_FLAGS_HYPER)
149	&& (unsigned)(Sel & X86_SEL_MASK) >= pVM->selm.s.GuestGdtr.cbGdt)
150	return VERR_INVALID_SELECTOR;
151	Desc = pVM->selm.s.CTXSUFF(paGdt)[Sel >> X86_SEL_SHIFT];
152	}
153	else
154	{
155	if ((unsigned)(Sel & X86_SEL_MASK) >= pVM->selm.s.cbLdtLimit)
156	return VERR_INVALID_SELECTOR;
157
158	/** @todo handle LDT page(s) not present! */
159	#ifdef IN_GC
160	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.GCPtrLdt + pVM->selm.s.offLdtHyper);
161	#else
162	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.HCPtrLdt + pVM->selm.s.offLdtHyper);
163	#endif
164	Desc = paLDT[Sel >> X86_SEL_SHIFT];
165	}
166
167	/*
168	* Check if present.
169	*/
170	if (Desc.Gen.u1Present)
171	{
172	/* calc limit. */
173	uint32_t u32Limit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
174	if (Desc.Gen.u1Granularity)
175	u32Limit = (u32Limit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
176
177	/* calc address assuming straight stuff. */
178	RTGCPTR pvFlat = (RTGCPTR)( (RTGCUINTPTR)Addr
179	+ ( (Desc.Gen.u8BaseHigh2 << 24)
180	\| (Desc.Gen.u8BaseHigh1 << 16)
181	\| Desc.Gen.u16BaseLow )
182	);
183	/*
184	* Type check.
185	*/
186	#define BOTH(a, b) ((a << 16) \| b)
187	switch (BOTH(Desc.Gen.u1DescType, Desc.Gen.u4Type))
188	{
189
190	/** Read only selector type. */
191	case BOTH(1,X86_SEL_TYPE_RO):
192	case BOTH(1,X86_SEL_TYPE_RO_ACC):
193	case BOTH(1,X86_SEL_TYPE_RW):
194	case BOTH(1,X86_SEL_TYPE_RW_ACC):
195	case BOTH(1,X86_SEL_TYPE_EO):
196	case BOTH(1,X86_SEL_TYPE_EO_ACC):
197	case BOTH(1,X86_SEL_TYPE_ER):
198	case BOTH(1,X86_SEL_TYPE_ER_ACC):
199	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
200	{
201	/** @todo fix this mess */
202	}
203	/* check limit. */
204	if ((RTGCUINTPTR)Addr > u32Limit)
205	return VERR_OUT_OF_SELECTOR_BOUNDS;
206	/* ok */
207	if (ppvGC)
208	*ppvGC = pvFlat;
209	if (pcb)
210	*pcb = u32Limit - (uint32_t)Addr + 1;
211	return VINF_SUCCESS;
212	case BOTH(1,X86_SEL_TYPE_EO_CONF):
213	case BOTH(1,X86_SEL_TYPE_EO_CONF_ACC):
214	case BOTH(1,X86_SEL_TYPE_ER_CONF):
215	case BOTH(1,X86_SEL_TYPE_ER_CONF_ACC):
216	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
217	{
218	/** @todo fix this mess */
219	}
220	/* check limit. */
221	if ((RTGCUINTPTR)Addr > u32Limit)
222	return VERR_OUT_OF_SELECTOR_BOUNDS;
223	/* ok */
224	if (ppvGC)
225	*ppvGC = pvFlat;
226	if (pcb)
227	*pcb = u32Limit - (uint32_t)Addr + 1;
228	return VINF_SUCCESS;
229
230	case BOTH(1,X86_SEL_TYPE_RO_DOWN):
231	case BOTH(1,X86_SEL_TYPE_RO_DOWN_ACC):
232	case BOTH(1,X86_SEL_TYPE_RW_DOWN):
233	case BOTH(1,X86_SEL_TYPE_RW_DOWN_ACC):
234	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
235	{
236	/** @todo fix this mess */
237	}
238	/* check limit. */
239	if (!Desc.Gen.u1Granularity && (RTGCUINTPTR)Addr > (RTGCUINTPTR)0xffff)
240	return VERR_OUT_OF_SELECTOR_BOUNDS;
241	if ((RTGCUINTPTR)Addr <= u32Limit)
242	return VERR_OUT_OF_SELECTOR_BOUNDS;
243
244	/* ok */
245	if (ppvGC)
246	*ppvGC = pvFlat;
247	if (pcb)
248	*pcb = (Desc.Gen.u1Granularity ? 0xffffffff : 0xffff) - (RTGCUINTPTR)Addr + 1;
249	return VINF_SUCCESS;
250
251	case BOTH(0,X86_SEL_TYPE_SYS_286_TSS_AVAIL):
252	case BOTH(0,X86_SEL_TYPE_SYS_LDT):
253	case BOTH(0,X86_SEL_TYPE_SYS_286_TSS_BUSY):
254	case BOTH(0,X86_SEL_TYPE_SYS_286_CALL_GATE):
255	case BOTH(0,X86_SEL_TYPE_SYS_TASK_GATE):
256	case BOTH(0,X86_SEL_TYPE_SYS_286_INT_GATE):
257	case BOTH(0,X86_SEL_TYPE_SYS_286_TRAP_GATE):
258	case BOTH(0,X86_SEL_TYPE_SYS_386_TSS_AVAIL):
259	case BOTH(0,X86_SEL_TYPE_SYS_386_TSS_BUSY):
260	case BOTH(0,X86_SEL_TYPE_SYS_386_CALL_GATE):
261	case BOTH(0,X86_SEL_TYPE_SYS_386_INT_GATE):
262	case BOTH(0,X86_SEL_TYPE_SYS_386_TRAP_GATE):
263	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
264	{
265	/** @todo fix this mess */
266	}
267	/* check limit. */
268	if ((RTGCUINTPTR)Addr > u32Limit)
269	return VERR_OUT_OF_SELECTOR_BOUNDS;
270	/* ok */
271	if (ppvGC)
272	*ppvGC = pvFlat;
273	if (pcb)
274	pcb = 0xffffffff - (RTGCUINTPTR)pvFlat + 1; / Depends on the type.. fixme if we care. */
275	return VINF_SUCCESS;
276
277	default:
278	return VERR_INVALID_SELECTOR;
279
280	}
281	#undef BOTH
282	}
283	return VERR_SELECTOR_NOT_PRESENT;
284	}
285
286
287	/**
288	* Validates and converts a GC selector based code address to a flat address.
289	*
290	* @returns Flat address.
291	* @param pVM VM Handle.
292	* @param SelCPL Current privilege level. Get this from SS - CS might be conforming!
293	* A full selector can be passed, we'll only use the RPL part.
294	* @param SelCS Selector part.
295	* @param Addr Address part.
296	* @param ppvFlat Where to store the flat address.
297	*/
298	static int selmValidateAndConvertCSAddr(PVM pVM, RTSEL SelCPL, RTSEL SelCS, RTGCPTR Addr, PRTGCPTR ppvFlat)
299	{
300	Assert(!CPUMAreHiddenSelRegsValid(pVM));
301
302	/** @todo validate limit! */
303	VBOXDESC Desc;
304	if (!(SelCS & X86_SEL_LDT))
305	Desc = pVM->selm.s.CTXSUFF(paGdt)[SelCS >> X86_SEL_SHIFT];
306	else
307	{
308	/** @todo handle LDT page(s) not present! */
309	#ifdef IN_GC
310	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.GCPtrLdt + pVM->selm.s.offLdtHyper);
311	#else
312	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.HCPtrLdt + pVM->selm.s.offLdtHyper);
313	#endif
314	Desc = paLDT[SelCS >> X86_SEL_SHIFT];
315	}
316
317	/*
318	* Check if present.
319	*/
320	if (Desc.Gen.u1Present)
321	{
322	/*
323	* Type check.
324	*/
325	if ( Desc.Gen.u1DescType == 1
326	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
327	{
328	/*
329	* Check level.
330	*/
331	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, SelCS & X86_SEL_RPL);
332	if ( !(Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
333	? uLevel <= Desc.Gen.u2Dpl
334	: uLevel >= Desc.Gen.u2Dpl /* hope I got this right now... */
335	)
336	{
337	/*
338	* Limit check.
339	*/
340	uint32_t u32Limit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
341	if (Desc.Gen.u1Granularity)
342	u32Limit = (u32Limit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
343	if ((RTGCUINTPTR)Addr <= u32Limit)
344	{
345	if (ppvFlat)
346	*ppvFlat = (RTGCPTR)( (RTGCUINTPTR)Addr
347	+ ( (Desc.Gen.u8BaseHigh2 << 24)
348	\| (Desc.Gen.u8BaseHigh1 << 16)
349	\| Desc.Gen.u16BaseLow)
350	);
351	return VINF_SUCCESS;
352	}
353	return VERR_OUT_OF_SELECTOR_BOUNDS;
354	}
355	return VERR_INVALID_RPL;
356	}
357	return VERR_NOT_CODE_SELECTOR;
358	}
359	return VERR_SELECTOR_NOT_PRESENT;
360	}
361
362
363	/**
364	* Validates and converts a GC selector based code address to a flat address.
365	*
366	* @returns Flat address.
367	* @param pVM VM Handle.
368	* @param eflags Current eflags
369	* @param SelCPL Current privilege level. Get this from SS - CS might be conforming!
370	* A full selector can be passed, we'll only use the RPL part.
371	* @param SelCS Selector part.
372	* @param pHiddenSel The hidden CS selector register.
373	* @param Addr Address part.
374	* @param ppvFlat Where to store the flat address.
375	*/
376	SELMDECL(int) SELMValidateAndConvertCSAddr(PVM pVM, X86EFLAGS eflags, RTSEL SelCPL, RTSEL SelCS, CPUMSELREGHID *pHiddenCSSel, RTGCPTR Addr, PRTGCPTR ppvFlat)
377	{
378	/*
379	* Deal with real & v86 mode first.
380	*/
381	if ( CPUMIsGuestInRealMode(pVM)
382	\|\| eflags.Bits.u1VM)
383	{
384	if (ppvFlat)
385	{
386	RTGCUINTPTR uFlat = ((RTGCUINTPTR)Addr & 0xffff) + ((RTGCUINTPTR)SelCS << 4);
387	*ppvFlat = (RTGCPTR)uFlat;
388	}
389	return VINF_SUCCESS;
390	}
391
392	if (!CPUMAreHiddenSelRegsValid(pVM))
393	return selmValidateAndConvertCSAddr(pVM, SelCPL, SelCS, Addr, ppvFlat);
394
395	/*
396	* Check if present.
397	*/
398	if (pHiddenCSSel->Attr.n.u1Present)
399	{
400	/*
401	* Type check.
402	*/
403	if ( pHiddenCSSel->Attr.n.u1DescType == 1
404	&& (pHiddenCSSel->Attr.n.u4Type & X86_SEL_TYPE_CODE))
405	{
406	/*
407	* Check level.
408	*/
409	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, SelCS & X86_SEL_RPL);
410	if ( !(pHiddenCSSel->Attr.n.u4Type & X86_SEL_TYPE_CONF)
411	? uLevel <= pHiddenCSSel->Attr.n.u2Dpl
412	: uLevel >= pHiddenCSSel->Attr.n.u2Dpl /* hope I got this right now... */
413	)
414	{
415	/*
416	* Limit check.
417	*/
418	uint32_t u32Limit = pHiddenCSSel->u32Limit;
419	/** @todo correct with hidden limit value?? */
420	if (pHiddenCSSel->Attr.n.u1Granularity)
421	u32Limit = (u32Limit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
422	if ((RTGCUINTPTR)Addr <= u32Limit)
423	{
424	if (ppvFlat)
425	*ppvFlat = (RTGCPTR)( (RTGCUINTPTR)Addr + pHiddenCSSel->u32Base );
426
427	return VINF_SUCCESS;
428	}
429	return VERR_OUT_OF_SELECTOR_BOUNDS;
430	}
431	return VERR_INVALID_RPL;
432	}
433	return VERR_NOT_CODE_SELECTOR;
434	}
435	return VERR_SELECTOR_NOT_PRESENT;
436	}
437
438
439	/**
440	* Checks if a selector is 32-bit or 16-bit.
441	*
442	* @returns True if it is 32-bit.
443	* @returns False if it is 16-bit.
444	* @param pVM VM Handle.
445	* @param Sel The selector.
446	*/
447	static bool selmIsSelector32Bit(PVM pVM, RTSEL Sel)
448	{
449	Assert(!CPUMAreHiddenSelRegsValid(pVM));
450
451	/** @todo validate limit! */
452	VBOXDESC Desc;
453	if (!(Sel & X86_SEL_LDT))
454	Desc = pVM->selm.s.CTXSUFF(paGdt)[Sel >> X86_SEL_SHIFT];
455	else
456	{
457	/** @todo handle LDT page(s) not present! */
458	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.CTXMID(,PtrLdt) + pVM->selm.s.offLdtHyper);
459	Desc = paLDT[Sel >> X86_SEL_SHIFT];
460	}
461	return Desc.Gen.u1DefBig;
462	}
463
464
465	/**
466	* Checks if a selector is 32-bit or 16-bit.
467	*
468	* @returns True if it is 32-bit.
469	* @returns False if it is 16-bit.
470	* @param pVM VM Handle.
471	* @param eflags Current eflags register
472	* @param Sel The selector.
473	* @param pHiddenSel The hidden selector register.
474	*/
475	SELMDECL(bool) SELMIsSelector32Bit(PVM pVM, X86EFLAGS eflags, RTSEL Sel, CPUMSELREGHID *pHiddenSel)
476	{
477	/*
478	* Deal with real & v86 mode first.
479	*/
480	if ( CPUMIsGuestInRealMode(pVM)
481	\|\| eflags.Bits.u1VM)
482	return false;
483
484	if (!CPUMAreHiddenSelRegsValid(pVM))
485	return selmIsSelector32Bit(pVM, Sel);
486
487	return pHiddenSel->Attr.n.u1DefBig;
488	}
489
490
491	/**
492	* Returns Hypervisor's Trap 08 (\#DF) selector.
493	*
494	* @returns Hypervisor's Trap 08 (\#DF) selector.
495	* @param pVM VM Handle.
496	*/
497	SELMDECL(RTSEL) SELMGetTrap8Selector(PVM pVM)
498	{
499	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
500	}
501
502
503	/**
504	* Sets EIP of Hypervisor's Trap 08 (\#DF) TSS.
505	*
506	* @param pVM VM Handle.
507	* @param u32EIP EIP of Trap 08 handler.
508	*/
509	SELMDECL(void) SELMSetTrap8EIP(PVM pVM, uint32_t u32EIP)
510	{
511	pVM->selm.s.TssTrap08.eip = u32EIP;
512	}
513
514
515	/**
516	* Sets ss:esp for ring1 in main Hypervisor's TSS.
517	*
518	* @param pVM VM Handle.
519	* @param ss Ring1 SS register value.
520	* @param esp Ring1 ESP register value.
521	*/
522	SELMDECL(void) SELMSetRing1Stack(PVM pVM, uint32_t ss, uint32_t esp)
523	{
524	pVM->selm.s.Tss.ss1 = ss;
525	pVM->selm.s.Tss.esp1 = esp;
526	}
527
528
529	/**
530	* Gets ss:esp for ring1 in main Hypervisor's TSS.
531	*
532	* @returns VBox status code.
533	* @param pVM VM Handle.
534	* @param pSS Ring1 SS register value.
535	* @param pEsp Ring1 ESP register value.
536	*/
537	SELMDECL(int) SELMGetRing1Stack(PVM pVM, uint32_t pSS, uint32_t pEsp)
538	{
539	if (pVM->selm.s.fSyncTSSRing0Stack)
540	{
541	GCPTRTYPE(uint8_t ) GCPtrTss = (GCPTRTYPE(uint8_t ))pVM->selm.s.GCPtrGuestTss;
542	int rc;
543	VBOXTSS tss;
544
545	Assert(pVM->selm.s.GCPtrGuestTss && pVM->selm.s.cbMonitoredGuestTss);
546
547	#ifdef IN_GC
548	bool fTriedAlready = false;
549
550	l_tryagain:
551	rc = MMGCRamRead(pVM, &tss.ss0, GCPtrTss + RT_OFFSETOF(VBOXTSS, ss0), sizeof(tss.ss0));
552	rc \|= MMGCRamRead(pVM, &tss.esp0, GCPtrTss + RT_OFFSETOF(VBOXTSS, esp0), sizeof(tss.esp0));
553	#ifdef DEBUG
554	rc \|= MMGCRamRead(pVM, &tss.offIoBitmap, GCPtrTss + RT_OFFSETOF(VBOXTSS, offIoBitmap), sizeof(tss.offIoBitmap));
555	#endif
556
557	if (VBOX_FAILURE(rc))
558	{
559	if (!fTriedAlready)
560	{
561	/* Shadow page might be out of sync. Sync and try again */
562	/** @todo might cross page boundary */
563	fTriedAlready = true;
564	rc = PGMPrefetchPage(pVM, GCPtrTss);
565	if (rc != VINF_SUCCESS)
566	return rc;
567	goto l_tryagain;
568	}
569	AssertMsgFailed(("Unable to read TSS structure at %08X\n", GCPtrTss));
570	return rc;
571	}
572
573	#else /* !IN_GC */
574	/* Reading too much. Could be cheaper than two seperate calls though. */
575	rc = PGMPhysReadGCPtr(pVM, &tss, GCPtrTss, sizeof(VBOXTSS));
576	if (VBOX_FAILURE(rc))
577	{
578	AssertReleaseMsgFailed(("Unable to read TSS structure at %08X\n", GCPtrTss));
579	return rc;
580	}
581	#endif /* !IN_GC */
582
583	#ifdef LOG_ENABLED
584	uint32_t ssr0 = pVM->selm.s.Tss.ss1;
585	uint32_t espr0 = pVM->selm.s.Tss.esp1;
586	ssr0 &= ~1;
587
588	if (ssr0 != tss.ss0 \|\| espr0 != tss.esp0)
589	Log(("SELMGetRing1Stack: Updating TSS ring 0 stack to %04X:%08X\n", tss.ss0, tss.esp0));
590
591	Log(("offIoBitmap=%#x\n", tss.offIoBitmap));
592	#endif
593	/* Update our TSS structure for the guest's ring 1 stack */
594	SELMSetRing1Stack(pVM, tss.ss0 \| 1, tss.esp0);
595	pVM->selm.s.fSyncTSSRing0Stack = false;
596	}
597
598	*pSS = pVM->selm.s.Tss.ss1;
599	*pEsp = pVM->selm.s.Tss.esp1;
600
601	return VINF_SUCCESS;
602	}
603
604
605	/**
606	* Returns Guest TSS pointer
607	*
608	* @param pVM VM Handle.
609	*/
610	SELMDECL(RTGCPTR) SELMGetGuestTSS(PVM pVM)
611	{
612	return (RTGCPTR)pVM->selm.s.GCPtrGuestTss;
613	}
614
615
616	/**
617	* Validates a CS selector.
618	*
619	* @returns VBox status code.
620	* @param pSelInfo Pointer to the selector information for the CS selector.
621	* @param SelCPL The selector defining the CPL (SS).
622	*/
623	SELMDECL(int) SELMSelInfoValidateCS(PCSELMSELINFO pSelInfo, RTSEL SelCPL)
624	{
625	/*
626	* Check if present.
627	*/
628	if (pSelInfo->Raw.Gen.u1Present)
629	{
630	/*
631	* Type check.
632	*/
633	if ( pSelInfo->Raw.Gen.u1DescType == 1
634	&& (pSelInfo->Raw.Gen.u4Type & X86_SEL_TYPE_CODE))
635	{
636	/*
637	* Check level.
638	*/
639	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, pSelInfo->Sel & X86_SEL_RPL);
640	if ( !(pSelInfo->Raw.Gen.u4Type & X86_SEL_TYPE_CONF)
641	? uLevel <= pSelInfo->Raw.Gen.u2Dpl
642	: uLevel >= pSelInfo->Raw.Gen.u2Dpl /* hope I got this right now... */
643	)
644	return VINF_SUCCESS;
645	return VERR_INVALID_RPL;
646	}
647	return VERR_NOT_CODE_SELECTOR;
648	}
649	return VERR_SELECTOR_NOT_PRESENT;
650	}
651
652
653	/**
654	* Gets the hypervisor code selector (CS).
655	* @returns CS selector.
656	* @param pVM The VM handle.
657	*/
658	SELMDECL(RTSEL) SELMGetHyperCS(PVM pVM)
659	{
660	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
661	}
662
663
664	/**
665	* Gets the 64-mode hypervisor code selector (CS64).
666	* @returns CS selector.
667	* @param pVM The VM handle.
668	*/
669	SELMDECL(RTSEL) SELMGetHyperCS64(PVM pVM)
670	{
671	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64];
672	}
673
674
675	/**
676	* Gets the hypervisor data selector (DS).
677	* @returns DS selector.
678	* @param pVM The VM handle.
679	*/
680	SELMDECL(RTSEL) SELMGetHyperDS(PVM pVM)
681	{
682	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
683	}
684
685
686	/**
687	* Gets the hypervisor TSS selector.
688	* @returns TSS selector.
689	* @param pVM The VM handle.
690	*/
691	SELMDECL(RTSEL) SELMGetHyperTSS(PVM pVM)
692	{
693	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS];
694	}
695
696
697	/**
698	* Gets the hypervisor TSS Trap 8 selector.
699	* @returns TSS Trap 8 selector.
700	* @param pVM The VM handle.
701	*/
702	SELMDECL(RTSEL) SELMGetHyperTSSTrap08(PVM pVM)
703	{
704	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
705	}
706
707
708	/**
709	* Gets the address for the hypervisor GDT.
710	*
711	* @returns The GDT address.
712	* @param pVM The VM handle.
713	* @remark This is intended only for very special use, like in the world
714	* switchers. Don't exploit this API!
715	*/
716	SELMDECL(RTGCPTR) SELMGetHyperGDT(PVM pVM)
717	{
718	/*
719	* Always convert this from the HC pointer since. We're can be
720	* called before the first relocation and have to work correctly
721	* without having dependencies on the relocation order.
722	*/
723	return MMHyperHC2GC(pVM, pVM->selm.s.paGdtHC);
724	}
725
726
727	/**
728	* Gets info about the current TSS.
729	*
730	* @returns VBox status code.
731	* @retval VINF_SUCCESS if we've got a TSS loaded.
732	* @retval VERR_SELM_NO_TSS if we haven't got a TSS (rather unlikely).
733	*
734	* @param pVM The VM handle.
735	* @param pGCPtrTss Where to store the TSS address.
736	* @param pcbTss Where to store the TSS size limit.
737	* @param pfCanHaveIOBitmap Where to store the can-have-I/O-bitmap indicator. (optional)
738	*/
739	SELMDECL(int) SELMGetTSSInfo(PVM pVM, PRTGCUINTPTR pGCPtrTss, PRTGCUINTPTR pcbTss, bool *pfCanHaveIOBitmap)
740	{
741	if (!CPUMAreHiddenSelRegsValid(pVM))
742	{
743	/*
744	* Do we have a valid TSS?
745	*/
746	if ( pVM->selm.s.GCSelTss == (RTSEL)~0
747	\|\| !pVM->selm.s.fGuestTss32Bit)
748	return VERR_SELM_NO_TSS;
749
750	/*
751	* Fill in return values.
752	*/
753	*pGCPtrTss = (RTGCUINTPTR)pVM->selm.s.GCPtrGuestTss;
754	*pcbTss = pVM->selm.s.cbGuestTss;
755	if (pfCanHaveIOBitmap)
756	*pfCanHaveIOBitmap = pVM->selm.s.fGuestTss32Bit;
757	}
758	else
759	{
760	CPUMSELREGHID *pHiddenTRReg;
761
762	pHiddenTRReg = CPUMGetGuestTRHid(pVM);
763
764	*pGCPtrTss = pHiddenTRReg->u32Base;
765	*pcbTss = pHiddenTRReg->u32Limit;
766
767	if (pfCanHaveIOBitmap)
768	*pfCanHaveIOBitmap = pHiddenTRReg->Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
769	\|\| pHiddenTRReg->Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
770	}
771	return VINF_SUCCESS;
772	}

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source: vbox/trunk/src/VBox/VMM/VMMAll/SELMAll.cpp@ 2017

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