TRPMAll.cpp@ 28112

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1	/* $Id: TRPMAll.cpp 26280 2010-02-05 05:16:00Z vboxsync $ */
2	/** @file
3	* TRPM - Trap Monitor - Any Context.
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	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_TRPM
27	#include <VBox/trpm.h>
28	#include <VBox/pgm.h>
29	#include <VBox/mm.h>
30	#include <VBox/patm.h>
31	#include <VBox/selm.h>
32	#include <VBox/stam.h>
33	#include "TRPMInternal.h"
34	#include <VBox/vm.h>
35	#include <VBox/err.h>
36	#include <VBox/x86.h>
37	#include <VBox/em.h>
38
39	#include <VBox/log.h>
40	#include <iprt/assert.h>
41	#include <iprt/asm.h>
42	#include <iprt/param.h>
43
44
45
46	/**
47	* Query info about the current active trap/interrupt.
48	* If no trap is active active an error code is returned.
49	*
50	* @returns VBox status code.
51	* @param pVCpu VMCPU handle.
52	* @param pu8TrapNo Where to store the trap number.
53	* @param pEnmType Where to store the trap type
54	*/
55	VMMDECL(int) TRPMQueryTrap(PVMCPU pVCpu, uint8_t pu8TrapNo, TRPMEVENT pEnmType)
56	{
57	/*
58	* Check if we have a trap at present.
59	*/
60	if (pVCpu->trpm.s.uActiveVector != ~0U)
61	{
62	if (pu8TrapNo)
63	*pu8TrapNo = (uint8_t)pVCpu->trpm.s.uActiveVector;
64	if (pEnmType)
65	*pEnmType = pVCpu->trpm.s.enmActiveType;
66	return VINF_SUCCESS;
67	}
68
69	return VERR_TRPM_NO_ACTIVE_TRAP;
70	}
71
72
73	/**
74	* Gets the trap number for the current trap.
75	*
76	* The caller is responsible for making sure there is an active trap which
77	* takes an error code when making this request.
78	*
79	* @returns The current trap number.
80	* @param pVCpu VMCPU handle.
81	*/
82	VMMDECL(uint8_t) TRPMGetTrapNo(PVMCPU pVCpu)
83	{
84	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
85	return (uint8_t)pVCpu->trpm.s.uActiveVector;
86	}
87
88
89	/**
90	* Gets the error code for the current trap.
91	*
92	* The caller is responsible for making sure there is an active trap which
93	* takes an error code when making this request.
94	*
95	* @returns Error code.
96	* @param pVCpu VMCPU handle.
97	*/
98	VMMDECL(RTGCUINT) TRPMGetErrorCode(PVMCPU pVCpu)
99	{
100	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
101	#ifdef VBOX_STRICT
102	switch (pVCpu->trpm.s.uActiveVector)
103	{
104	case 0x0a:
105	case 0x0b:
106	case 0x0c:
107	case 0x0d:
108	case 0x0e:
109	case 0x11:
110	case 0x08:
111	break;
112	default:
113	AssertMsgFailed(("This trap (%#x) doesn't have any error code\n", pVCpu->trpm.s.uActiveVector));
114	break;
115	}
116	#endif
117	return pVCpu->trpm.s.uActiveErrorCode;
118	}
119
120
121	/**
122	* Gets the fault address for the current trap.
123	*
124	* The caller is responsible for making sure there is an active trap 0x0e when
125	* making this request.
126	*
127	* @returns Fault address associated with the trap.
128	* @param pVCpu VMCPU handle.
129	*/
130	VMMDECL(RTGCUINTPTR) TRPMGetFaultAddress(PVMCPU pVCpu)
131	{
132	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
133	AssertMsg(pVCpu->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
134	return pVCpu->trpm.s.uActiveCR2;
135	}
136
137
138	/**
139	* Clears the current active trap/exception/interrupt.
140	*
141	* The caller is responsible for making sure there is an active trap
142	* when making this request.
143	*
144	* @returns VBox status code.
145	* @param pVCpu VMCPU handle.
146	*/
147	VMMDECL(int) TRPMResetTrap(PVMCPU pVCpu)
148	{
149	/*
150	* Cannot reset non-existing trap!
151	*/
152	if (pVCpu->trpm.s.uActiveVector == ~0U)
153	{
154	AssertMsgFailed(("No active trap!\n"));
155	return VERR_TRPM_NO_ACTIVE_TRAP;
156	}
157
158	/*
159	* Reset it.
160	*/
161	pVCpu->trpm.s.uActiveVector = ~0U;
162	return VINF_SUCCESS;
163	}
164
165
166	/**
167	* Assert trap/exception/interrupt.
168	*
169	* The caller is responsible for making sure there is no active trap
170	* when making this request.
171	*
172	* @returns VBox status code.
173	* @param pVCpu VMCPU handle.
174	* @param u8TrapNo The trap vector to assert.
175	* @param enmType Trap type.
176	*/
177	VMMDECL(int) TRPMAssertTrap(PVMCPU pVCpu, uint8_t u8TrapNo, TRPMEVENT enmType)
178	{
179	Log2(("TRPMAssertTrap: u8TrapNo=%02x type=%d\n", u8TrapNo, enmType));
180
181	/*
182	* Cannot assert a trap when one is already active.
183	*/
184	if (pVCpu->trpm.s.uActiveVector != ~0U)
185	{
186	AssertMsgFailed(("CPU%d: Active trap %#x\n", pVCpu->idCpu, pVCpu->trpm.s.uActiveVector));
187	return VERR_TRPM_ACTIVE_TRAP;
188	}
189
190	pVCpu->trpm.s.uActiveVector = u8TrapNo;
191	pVCpu->trpm.s.enmActiveType = enmType;
192	pVCpu->trpm.s.uActiveErrorCode = ~0;
193	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
194	return VINF_SUCCESS;
195	}
196
197
198	/**
199	* Sets the error code of the current trap.
200	* (This function is for use in trap handlers and such.)
201	*
202	* The caller is responsible for making sure there is an active trap
203	* which takes an errorcode when making this request.
204	*
205	* @param pVCpu VMCPU handle.
206	* @param uErrorCode The new error code.
207	*/
208	VMMDECL(void) TRPMSetErrorCode(PVMCPU pVCpu, RTGCUINT uErrorCode)
209	{
210	Log2(("TRPMSetErrorCode: uErrorCode=%RGv\n", uErrorCode)); /** @todo RTGCUINT mess! */
211	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
212	pVCpu->trpm.s.uActiveErrorCode = uErrorCode;
213	#ifdef VBOX_STRICT
214	switch (pVCpu->trpm.s.uActiveVector)
215	{
216	case 0x0a: case 0x0b: case 0x0c: case 0x0d: case 0x0e:
217	AssertMsg(uErrorCode != ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
218	break;
219	case 0x11: case 0x08:
220	AssertMsg(uErrorCode == 0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
221	break;
222	default:
223	AssertMsg(uErrorCode == ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
224	break;
225	}
226	#endif
227	}
228
229
230	/**
231	* Sets the error code of the current trap.
232	* (This function is for use in trap handlers and such.)
233	*
234	* The caller is responsible for making sure there is an active trap 0e
235	* when making this request.
236	*
237	* @param pVCpu VMCPU handle.
238	* @param uCR2 The new fault address (cr2 register).
239	*/
240	VMMDECL(void) TRPMSetFaultAddress(PVMCPU pVCpu, RTGCUINTPTR uCR2)
241	{
242	Log2(("TRPMSetFaultAddress: uCR2=%RGv\n", uCR2));
243	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
244	AssertMsg(pVCpu->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
245	pVCpu->trpm.s.uActiveCR2 = uCR2;
246	}
247
248
249	/**
250	* Checks if the current active trap/interrupt/exception/fault/whatever is a software
251	* interrupt or not.
252	*
253	* The caller is responsible for making sure there is an active trap
254	* when making this request.
255	*
256	* @returns true if software interrupt, false if not.
257	*
258	* @param pVCpu VMCPU handle.
259	*/
260	VMMDECL(bool) TRPMIsSoftwareInterrupt(PVMCPU pVCpu)
261	{
262	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
263	return (pVCpu->trpm.s.enmActiveType == TRPM_SOFTWARE_INT);
264	}
265
266
267	/**
268	* Check if there is an active trap.
269	*
270	* @returns true if trap active, false if not.
271	* @param pVCpu VMCPU handle.
272	*/
273	VMMDECL(bool) TRPMHasTrap(PVMCPU pVCpu)
274	{
275	return pVCpu->trpm.s.uActiveVector != ~0U;
276	}
277
278
279	/**
280	* Query all info about the current active trap/interrupt.
281	* If no trap is active active an error code is returned.
282	*
283	* @returns VBox status code.
284	* @param pVCpu VMCPU handle.
285	* @param pu8TrapNo Where to store the trap number.
286	* @param pEnmType Where to store the trap type
287	* @param puErrorCode Where to store the error code associated with some traps.
288	* ~0U is stored if the trap has no error code.
289	* @param puCR2 Where to store the CR2 associated with a trap 0E.
290	*/
291	VMMDECL(int) TRPMQueryTrapAll(PVMCPU pVCpu, uint8_t pu8TrapNo, TRPMEVENT pEnmType, PRTGCUINT puErrorCode, PRTGCUINTPTR puCR2)
292	{
293	/*
294	* Check if we have a trap at present.
295	*/
296	if (pVCpu->trpm.s.uActiveVector == ~0U)
297	return VERR_TRPM_NO_ACTIVE_TRAP;
298
299	if (pu8TrapNo)
300	*pu8TrapNo = (uint8_t)pVCpu->trpm.s.uActiveVector;
301	if (pEnmType)
302	*pEnmType = pVCpu->trpm.s.enmActiveType;
303	if (puErrorCode)
304	*puErrorCode = pVCpu->trpm.s.uActiveErrorCode;
305	if (puCR2)
306	*puCR2 = pVCpu->trpm.s.uActiveCR2;
307
308	return VINF_SUCCESS;
309	}
310
311
312	/**
313	* Save the active trap.
314	*
315	* This routine useful when doing try/catch in the hypervisor.
316	* Any function which uses temporary trap handlers should
317	* probably also use this facility to save the original trap.
318	*
319	* @param pVM VM handle.
320	*/
321	VMMDECL(void) TRPMSaveTrap(PVMCPU pVCpu)
322	{
323	pVCpu->trpm.s.uSavedVector = pVCpu->trpm.s.uActiveVector;
324	pVCpu->trpm.s.enmSavedType = pVCpu->trpm.s.enmActiveType;
325	pVCpu->trpm.s.uSavedErrorCode = pVCpu->trpm.s.uActiveErrorCode;
326	pVCpu->trpm.s.uSavedCR2 = pVCpu->trpm.s.uActiveCR2;
327	}
328
329
330	/**
331	* Restore a saved trap.
332	*
333	* Multiple restores of a saved trap is possible.
334	*
335	* @param pVM VM handle.
336	*/
337	VMMDECL(void) TRPMRestoreTrap(PVMCPU pVCpu)
338	{
339	pVCpu->trpm.s.uActiveVector = pVCpu->trpm.s.uSavedVector;
340	pVCpu->trpm.s.enmActiveType = pVCpu->trpm.s.enmSavedType;
341	pVCpu->trpm.s.uActiveErrorCode = pVCpu->trpm.s.uSavedErrorCode;
342	pVCpu->trpm.s.uActiveCR2 = pVCpu->trpm.s.uSavedCR2;
343	}
344
345
346	#ifndef IN_RING0
347	/**
348	* Forward trap or interrupt to the guest's handler
349	*
350	*
351	* @returns VBox status code.
352	* or does not return at all (when the trap is actually forwarded)
353	*
354	* @param pVM The VM to operate on.
355	* @param pRegFrame Pointer to the register frame for the trap.
356	* @param iGate Trap or interrupt gate number
357	* @param opsize Instruction size (only relevant for software interrupts)
358	* @param enmError TRPM_TRAP_HAS_ERRORCODE or TRPM_TRAP_NO_ERRORCODE.
359	* @param enmType TRPM event type
360	* @param iOrgTrap The original trap.
361	* @internal
362	*/
363	VMMDECL(int) TRPMForwardTrap(PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, uint32_t iGate, uint32_t opsize, TRPMERRORCODE enmError, TRPMEVENT enmType, int32_t iOrgTrap)
364	{
365	#ifdef TRPM_FORWARD_TRAPS_IN_GC
366	PVM pVM = pVCpu->CTX_SUFF(pVM);
367	X86EFLAGS eflags;
368	Assert(pVM->cCpus == 1);
369
370	STAM_PROFILE_ADV_START(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
371
372	# if defined(VBOX_STRICT) \|\| defined(LOG_ENABLED)
373	if (pRegFrame->eflags.Bits.u1VM)
374	Log(("TRPMForwardTrap-VM: eip=%04X:%04X iGate=%d\n", pRegFrame->cs, pRegFrame->eip, iGate));
375	else
376	Log(("TRPMForwardTrap: eip=%04X:%08X iGate=%d\n", pRegFrame->cs, pRegFrame->eip, iGate));
377
378	switch (iGate) {
379	case 14:
380	if (pRegFrame->eip == pVCpu->trpm.s.uActiveCR2)
381	{
382	int rc;
383	RTGCPTR pCallerGC;
384	# ifdef IN_RC
385	rc = MMGCRamRead(pVM, &pCallerGC, (void *)pRegFrame->esp, sizeof(pCallerGC));
386	# else
387	rc = PGMPhysSimpleReadGCPtr(pVCpu, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
388	# endif
389	if (RT_SUCCESS(rc))
390	Log(("TRPMForwardTrap: caller=%RGv\n", pCallerGC));
391	}
392	/* no break */
393	case 8:
394	case 10:
395	case 11:
396	case 12:
397	case 13:
398	case 17:
399	Assert(enmError == TRPM_TRAP_HAS_ERRORCODE \|\| enmType == TRPM_SOFTWARE_INT);
400	break;
401
402	default:
403	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
404	break;
405	}
406	# endif /* VBOX_STRICT \|\| LOG_ENABLED */
407
408	/* Retrieve the eflags including the virtualized bits. */
409	/* Note: hackish as the cpumctxcore structure doesn't contain the right value */
410	eflags.u32 = CPUMRawGetEFlags(pVCpu, pRegFrame);
411
412	/* VMCPU_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
413	Assert(enmType != TRPM_HARDWARE_INT \|\| !VMCPU_FF_ISSET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS));
414
415	/*
416	* If it's a real guest trap and the guest's page fault handler is marked as safe for GC execution, then we call it directly.
417	* Well, only if the IF flag is set.
418	*/
419	/** @todo if the trap handler was modified and marked invalid, then we should now go back to the host context and install a new patch. */
420	if ( pVM->trpm.s.aGuestTrapHandler[iGate]
421	&& (eflags.Bits.u1IF)
422	#ifndef VBOX_RAW_V86
423	&& !(eflags.Bits.u1VM) /** @todo implement when needed (illegal for same privilege level transfers). */
424	#endif
425	&& !PATMIsPatchGCAddr(pVM, pRegFrame->eip)
426	)
427	{
428	uint16_t cbIDT;
429	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVCpu, &cbIDT);
430	uint32_t cpl;
431	VBOXIDTE GuestIdte;
432	RTGCPTR pIDTEntry;
433	int rc;
434
435	Assert(PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame));
436	Assert(!VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_SELM_SYNC_GDT \| VMCPU_FF_SELM_SYNC_LDT \| VMCPU_FF_TRPM_SYNC_IDT \| VMCPU_FF_SELM_SYNC_TSS));
437
438	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
439	goto failure;
440
441	/* Get the current privilege level. */
442	cpl = CPUMGetGuestCPL(pVCpu, pRegFrame);
443
444	/*
445	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
446	* All very obscure, but still necessary.
447	* Currently only some CS & TSS selector checks are missing.
448	*
449	*/
450	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
451	#ifdef IN_RC
452	rc = MMGCRamRead(pVM, &GuestIdte, (void *)(uintptr_t)pIDTEntry, sizeof(GuestIdte));
453	#else
454	rc = PGMPhysSimpleReadGCPtr(pVCpu, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
455	#endif
456	if (RT_FAILURE(rc))
457	{
458	/* The page might be out of sync. / /* @todo might cross a page boundary) */
459	Log(("Page %RGv out of sync -> prefetch and try again\n", pIDTEntry));
460	rc = PGMPrefetchPage(pVCpu, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
461	if (rc != VINF_SUCCESS)
462	{
463	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Rrc\n", rc));
464	goto failure;
465	}
466	#ifdef IN_RC
467	rc = MMGCRamRead(pVM, &GuestIdte, (void *)(uintptr_t)pIDTEntry, sizeof(GuestIdte));
468	#else
469	rc = PGMPhysSimpleReadGCPtr(pVCpu, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
470	#endif
471	}
472	if ( RT_SUCCESS(rc)
473	&& GuestIdte.Gen.u1Present
474	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
475	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
476	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
477	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
478	)
479	{
480	RTGCPTR pHandler, dummy;
481	RTGCPTR pTrapStackGC;
482
483	pHandler = (RTGCPTR)VBOXIDTE_OFFSET(GuestIdte);
484
485	/* Note: SELMValidateAndConvertCSAddr checks for code type, memory type, selector validity. */
486	/** @todo dpl <= cpl else GPF */
487
488	/* Note: don't use current eflags as we might be in V86 mode and the IDT always contains protected mode selectors */
489	X86EFLAGS fakeflags;
490	fakeflags.u32 = 0;
491
492	rc = SELMValidateAndConvertCSAddr(pVM, fakeflags, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
493	if (rc == VINF_SUCCESS)
494	{
495	VBOXGDTR gdtr = {0, 0};
496	bool fConforming = false;
497	int idx = 0;
498	uint32_t dpl;
499	uint32_t ss_r0;
500	uint32_t esp_r0;
501	X86DESC Desc;
502	RTGCPTR pGdtEntry;
503
504	CPUMGetGuestGDTR(pVCpu, &gdtr);
505	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
506
507	if (!gdtr.pGdt)
508	goto failure;
509
510	pGdtEntry = gdtr.pGdt + (GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT) * sizeof(X86DESC);
511	#ifdef IN_RC
512	rc = MMGCRamRead(pVM, &Desc, (void *)(uintptr_t)pGdtEntry, sizeof(Desc));
513	#else
514	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, pGdtEntry, sizeof(Desc));
515	#endif
516	if (RT_FAILURE(rc))
517	{
518	/* The page might be out of sync. / /* @todo might cross a page boundary) */
519	Log(("Page %RGv out of sync -> prefetch and try again\n", pGdtEntry));
520	rc = PGMPrefetchPage(pVCpu, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
521	if (rc != VINF_SUCCESS)
522	{
523	Log(("PGMPrefetchPage failed with rc=%Rrc\n", rc));
524	goto failure;
525	}
526	#ifdef IN_RC
527	rc = MMGCRamRead(pVM, &Desc, (void *)(uintptr_t)pGdtEntry, sizeof(Desc));
528	#else
529	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, pGdtEntry, sizeof(Desc));
530	#endif
531	if (RT_FAILURE(rc))
532	{
533	Log(("MMGCRamRead failed with %Rrc\n", rc));
534	goto failure;
535	}
536	}
537
538	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
539	{
540	Log(("Conforming code selector\n"));
541	fConforming = true;
542	}
543	/** @todo check descriptor type!! */
544
545	dpl = Desc.Gen.u2Dpl;
546
547	if (!fConforming && dpl < cpl) /* to inner privilege level */
548	{
549	rc = SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
550	if (RT_FAILURE(rc))
551	goto failure;
552
553	Assert((ss_r0 & X86_SEL_RPL) == 1);
554
555	if ( !esp_r0
556	\|\| !ss_r0
557	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
558	\|\| SELMToFlatBySelEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
559	)
560	{
561	Log(("Invalid ring 0 stack %04X:%08RX32\n", ss_r0, esp_r0));
562	goto failure;
563	}
564	}
565	else
566	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
567	{
568	ss_r0 = pRegFrame->ss;
569	esp_r0 = pRegFrame->esp;
570
571	if ( eflags.Bits.u1VM /* illegal */
572	\|\| SELMToFlatBySelEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
573	{
574	AssertMsgFailed(("Invalid stack %04X:%08RX32??? (VM=%d)\n", ss_r0, esp_r0, eflags.Bits.u1VM));
575	goto failure;
576	}
577	}
578	else
579	{
580	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
581	goto failure;
582	}
583	/*
584	* Build trap stack frame on guest handler's stack
585	*/
586	uint32_t *pTrapStack;
587	#ifdef IN_RC
588	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss & X86_SEL_RPL) != 0);
589	/* Check maximum amount we need (10 when executing in V86 mode) */
590	rc = PGMVerifyAccess(pVCpu, (RTGCUINTPTR)pTrapStackGC - 10sizeof(uint32_t), 10 sizeof(uint32_t), X86_PTE_RW);
591	pTrapStack = (uint32_t *)(uintptr_t)pTrapStackGC;
592	#else
593	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss & X86_SEL_RPL) == 0 \|\| (pRegFrame->ss & X86_SEL_RPL) == 3);
594	/* Check maximum amount we need (10 when executing in V86 mode) */
595	if ((pTrapStackGC >> PAGE_SHIFT) != ((pTrapStackGC - 10sizeof(uint32_t)) >> PAGE_SHIFT)) / fail if we cross a page boundary */
596	goto failure;
597	PGMPAGEMAPLOCK PageMappingLock;
598	rc = PGMPhysGCPtr2CCPtr(pVCpu, pTrapStackGC, (void **)&pTrapStack, &PageMappingLock);
599	if (RT_FAILURE(rc))
600	{
601	AssertRC(rc);
602	goto failure;
603	}
604	#endif
605	if (rc == VINF_SUCCESS)
606	{
607	/** if eflags.Bits.u1VM then push gs, fs, ds, es */
608	if (eflags.Bits.u1VM)
609	{
610	Log(("TRAP%02X: (VM) Handler %04X:%RGv Stack %04X:%08X RPL=%d CR2=%08X\n", iGate, GuestIdte.Gen.u16SegSel, pHandler, ss_r0, esp_r0, (pRegFrame->ss & X86_SEL_RPL), pVCpu->trpm.s.uActiveCR2));
611	pTrapStack[--idx] = pRegFrame->gs;
612	pTrapStack[--idx] = pRegFrame->fs;
613	pTrapStack[--idx] = pRegFrame->ds;
614	pTrapStack[--idx] = pRegFrame->es;
615
616	/* clear ds, es, fs & gs in current context */
617	pRegFrame->ds = pRegFrame->es = pRegFrame->fs = pRegFrame->gs = 0;
618	}
619	else
620	Log(("TRAP%02X: Handler %04X:%RGv Stack %04X:%08X RPL=%d CR2=%08X\n", iGate, GuestIdte.Gen.u16SegSel, pHandler, ss_r0, esp_r0, (pRegFrame->ss & X86_SEL_RPL), pVCpu->trpm.s.uActiveCR2));
621
622	if (!fConforming && dpl < cpl)
623	{
624	if ((pRegFrame->ss & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
625	pTrapStack[--idx] = pRegFrame->ss & ~1; /* Mask away traces of raw ring execution (ring 1). */
626	else
627	pTrapStack[--idx] = pRegFrame->ss;
628
629	pTrapStack[--idx] = pRegFrame->esp;
630	}
631
632	/* Note: We use the eflags copy, that includes the virtualized bits! */
633	/* Note: Not really necessary as we grab include those bits in the trap/irq handler trampoline */
634	pTrapStack[--idx] = eflags.u32;
635
636	if ((pRegFrame->cs & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
637	pTrapStack[--idx] = pRegFrame->cs & ~1; /* Mask away traces of raw ring execution (ring 1). */
638	else
639	pTrapStack[--idx] = pRegFrame->cs;
640
641	if (enmType == TRPM_SOFTWARE_INT)
642	{
643	Assert(opsize);
644	pTrapStack[--idx] = pRegFrame->eip + opsize; /* return address = next instruction */
645	}
646	else
647	pTrapStack[--idx] = pRegFrame->eip;
648
649	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
650	{
651	pTrapStack[--idx] = pVCpu->trpm.s.uActiveErrorCode;
652	}
653
654	Assert(esp_r0 > -idx*sizeof(uint32_t));
655	/* Adjust ESP accordingly */
656	esp_r0 += idx*sizeof(uint32_t);
657
658	/* Mask away dangerous flags for the trap/interrupt handler. */
659	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
660	#ifdef DEBUG
661	for (int j = idx; j < 0; j++)
662	Log4(("Stack %RRv pos %02d: %08x\n", &pTrapStack[j], j, pTrapStack[j]));
663
664	Log4(("eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
665	"eip=%08x esp=%08x ebp=%08x iopl=%d\n"
666	"cs=%04x ds=%04x es=%04x fs=%04x gs=%04x eflags=%08x\n",
667	pRegFrame->eax, pRegFrame->ebx, pRegFrame->ecx, pRegFrame->edx, pRegFrame->esi, pRegFrame->edi,
668	pRegFrame->eip, pRegFrame->esp, pRegFrame->ebp, eflags.Bits.u2IOPL,
669	(RTSEL)pRegFrame->cs, (RTSEL)pRegFrame->ds, (RTSEL)pRegFrame->es,
670	(RTSEL)pRegFrame->fs, (RTSEL)pRegFrame->gs, eflags.u32));
671	#endif
672
673	Log(("PATM Handler %RRv Adjusted stack %08X new EFLAGS=%08X idx=%d dpl=%d cpl=%d\n", pVM->trpm.s.aGuestTrapHandler[iGate], esp_r0, eflags.u32, idx, dpl, cpl));
674
675	/* Make sure the internal guest context structure is up-to-date. */
676	CPUMSetGuestCR2(pVCpu, pVCpu->trpm.s.uActiveCR2);
677
678	#ifdef IN_RC
679	/* Note: shouldn't be necessary */
680	ASMSetCR2(pVCpu->trpm.s.uActiveCR2);
681
682	/* Turn off interrupts for interrupt gates. */
683	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
684	CPUMRawSetEFlags(pVCpu, pRegFrame, eflags.u32 & ~X86_EFL_IF);
685
686	/* The virtualized bits must be removed again!! */
687	eflags.Bits.u1IF = 1;
688	eflags.Bits.u2IOPL = 0;
689
690	Assert(eflags.Bits.u1IF);
691	Assert(eflags.Bits.u2IOPL == 0);
692	STAM_COUNTER_INC(&pVM->trpm.s.CTX_SUFF(paStatForwardedIRQ)[iGate]);
693	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
694	if (iOrgTrap >= 0 && iOrgTrap < (int)RT_ELEMENTS(pVM->trpm.s.aStatGCTraps))
695	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[iOrgTrap], o);
696
697	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate], eflags.u32, ss_r0, (RTRCPTR)esp_r0);
698	/* does not return */
699	#else
700	/* Turn off interrupts for interrupt gates. */
701	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
702	eflags.Bits.u1IF = 0;
703
704	pRegFrame->eflags.u32 = eflags.u32;
705
706	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
707	pRegFrame->cs = GuestIdte.Gen.u16SegSel;
708	pRegFrame->esp = esp_r0;
709	pRegFrame->ss = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
710	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
711	PGMPhysReleasePageMappingLock(pVM, &PageMappingLock);
712	return VINF_SUCCESS;
713	#endif
714	}
715	else
716	Log(("TRAP%02X: PGMVerifyAccess %RGv failed with %Rrc -> forward to REM\n", iGate, pTrapStackGC, rc));
717	}
718	else
719	Log(("SELMValidateAndConvertCSAddr failed with %Rrc\n", rc));
720	}
721	else
722	Log(("MMRamRead %RGv size %d failed with %Rrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
723	}
724	else
725	{
726	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
727	#ifdef VBOX_WITH_STATISTICS
728	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
729	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
730	else if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
731	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
732	#endif
733	}
734	failure:
735	STAM_COUNTER_INC(&pVM->trpm.s.CTX_SUFF_Z(StatForwardFail));
736	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
737
738	Log(("TRAP%02X: forwarding to REM (ss rpl=%d eflags=%08X VMIF=%d handler=%08X\n", iGate, pRegFrame->ss & X86_SEL_RPL, pRegFrame->eflags.u32, PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame), pVM->trpm.s.aGuestTrapHandler[iGate]));
739	#endif
740	return VINF_EM_RAW_GUEST_TRAP;
741	}
742	#endif /* !IN_RING0 */
743
744
745	/**
746	* Raises a cpu exception which doesn't take an error code.
747	*
748	* This function may or may not dispatch the exception before returning.
749	*
750	* @returns VBox status code fit for scheduling.
751	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
752	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
753	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
754	*
755	* @param pVM The VM handle.
756	* @param pCtxCore The CPU context core.
757	* @param enmXcpt The exception.
758	*/
759	VMMDECL(int) TRPMRaiseXcpt(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
760	{
761	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs, pCtxCore->eip, enmXcpt));
762	/** @todo dispatch the trap. */
763	pVCpu->trpm.s.uActiveVector = enmXcpt;
764	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
765	pVCpu->trpm.s.uActiveErrorCode = 0xdeadbeef;
766	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
767	return VINF_EM_RAW_GUEST_TRAP;
768	}
769
770
771	/**
772	* Raises a cpu exception with an errorcode.
773	*
774	* This function may or may not dispatch the exception before returning.
775	*
776	* @returns VBox status code fit for scheduling.
777	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
778	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
779	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
780	*
781	* @param pVM The VM handle.
782	* @param pCtxCore The CPU context core.
783	* @param enmXcpt The exception.
784	* @param uErr The error code.
785	*/
786	VMMDECL(int) TRPMRaiseXcptErr(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
787	{
788	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr));
789	/** @todo dispatch the trap. */
790	pVCpu->trpm.s.uActiveVector = enmXcpt;
791	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
792	pVCpu->trpm.s.uActiveErrorCode = uErr;
793	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
794	return VINF_EM_RAW_GUEST_TRAP;
795	}
796
797
798	/**
799	* Raises a cpu exception with an errorcode and CR2.
800	*
801	* This function may or may not dispatch the exception before returning.
802	*
803	* @returns VBox status code fit for scheduling.
804	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
805	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
806	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
807	*
808	* @param pVM The VM handle.
809	* @param pCtxCore The CPU context core.
810	* @param enmXcpt The exception.
811	* @param uErr The error code.
812	* @param uCR2 The CR2 value.
813	*/
814	VMMDECL(int) TRPMRaiseXcptErrCR2(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
815	{
816	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr, uCR2));
817	/** @todo dispatch the trap. */
818	pVCpu->trpm.s.uActiveVector = enmXcpt;
819	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
820	pVCpu->trpm.s.uActiveErrorCode = uErr;
821	pVCpu->trpm.s.uActiveCR2 = uCR2;
822	return VINF_EM_RAW_GUEST_TRAP;
823	}
824
825
826	/**
827	* Clear guest trap/interrupt gate handler
828	*
829	* @returns VBox status code.
830	* @param pVM The VM to operate on.
831	* @param iTrap Interrupt/trap number.
832	*/
833	VMMDECL(int) trpmClearGuestTrapHandler(PVM pVM, unsigned iTrap)
834	{
835	/*
836	* Validate.
837	*/
838	if (iTrap >= RT_ELEMENTS(pVM->trpm.s.aIdt))
839	{
840	AssertMsg(iTrap < TRPM_HANDLER_INT_BASE, ("Illegal gate number %d!\n", iTrap));
841	return VERR_INVALID_PARAMETER;
842	}
843
844	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
845	#ifdef IN_RING3
846	trpmR3ClearPassThroughHandler(pVM, iTrap);
847	#else
848	AssertFailed();
849	#endif
850
851	pVM->trpm.s.aGuestTrapHandler[iTrap] = TRPM_INVALID_HANDLER;
852	return VINF_SUCCESS;
853	}
854

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

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