TRPMAll.cpp@ 3313

Last change on this file since 3313 was 3313, checked in by vboxsync, 17 years ago
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1	/* $Id: TRPMAll.cpp 3313 2007-06-27 11:42:44Z vboxsync $ */
2	/** @file
3	* TRPM - Trap Monitor - Any Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek 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_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 "TRPMInternal.h"
33	#include <VBox/vm.h>
34	#include <VBox/err.h>
35	#include <VBox/x86.h>
36	#include <VBox/em.h>
37
38	#include <VBox/log.h>
39	#include <iprt/assert.h>
40	#include <iprt/asm.h>
41	#include <iprt/param.h>
42
43
44
45	/**
46	* Query info about the current active trap/interrupt.
47	* If no trap is active active an error code is returned.
48	*
49	* @returns VBox status code.
50	* @param pVM The virtual machine.
51	* @param pu8TrapNo Where to store the trap number.
52	* @param pEnmType Where to store the trap type
53	*/
54	TRPMDECL(int) TRPMQueryTrap(PVM pVM, uint8_t pu8TrapNo, TRPMEVENT pEnmType)
55	{
56	/*
57	* Check if we have a trap at present.
58	*/
59	if (pVM->trpm.s.uActiveVector != ~0U)
60	{
61	if (pu8TrapNo)
62	*pu8TrapNo = (uint8_t)pVM->trpm.s.uActiveVector;
63	if (pEnmType)
64	*pEnmType = pVM->trpm.s.enmActiveType;
65	return VINF_SUCCESS;
66	}
67
68	return VERR_TRPM_NO_ACTIVE_TRAP;
69	}
70
71
72	/**
73	* Gets the trap number for the current trap.
74	*
75	* The caller is responsible for making sure there is an active trap which
76	* takes an error code when making this request.
77	*
78	* @returns The current trap number.
79	* @param pVM VM handle.
80	*/
81	TRPMDECL(uint8_t) TRPMGetTrapNo(PVM pVM)
82	{
83	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
84	return (uint8_t)pVM->trpm.s.uActiveVector;
85	}
86
87
88	/**
89	* Gets the error code for the current trap.
90	*
91	* The caller is responsible for making sure there is an active trap which
92	* takes an error code when making this request.
93	*
94	* @returns Error code.
95	* @param pVM VM handle.
96	*/
97	TRPMDECL(RTGCUINT) TRPMGetErrorCode(PVM pVM)
98	{
99	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
100	#ifdef VBOX_STRICT
101	switch (pVM->trpm.s.uActiveVector)
102	{
103	case 0x0a:
104	case 0x0b:
105	case 0x0c:
106	case 0x0d:
107	case 0x0e:
108	case 0x11:
109	case 0x08:
110	break;
111	default:
112	AssertMsgFailed(("This trap (%#x) doesn't have any error code\n", pVM->trpm.s.uActiveVector));
113	break;
114	}
115	#endif
116	return pVM->trpm.s.uActiveErrorCode;
117	}
118
119
120	/**
121	* Gets the fault address for the current trap.
122	*
123	* The caller is responsible for making sure there is an active trap 0x0e when
124	* making this request.
125	*
126	* @returns Fault address associated with the trap.
127	* @param pVM VM handle.
128	*/
129	TRPMDECL(RTGCUINTPTR) TRPMGetFaultAddress(PVM pVM)
130	{
131	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
132	AssertMsg(pVM->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
133	return pVM->trpm.s.uActiveCR2;
134	}
135
136
137	/**
138	* Clears the current active trap/exception/interrupt.
139	*
140	* The caller is responsible for making sure there is an active trap
141	* when making this request.
142	*
143	* @returns VBox status code.
144	* @param pVM The virtual machine handle.
145	*/
146	TRPMDECL(int) TRPMResetTrap(PVM pVM)
147	{
148	/*
149	* Cannot reset non-existing trap!
150	*/
151	if (pVM->trpm.s.uActiveVector == ~0U)
152	{
153	AssertMsgFailed(("No active trap!\n"));
154	return VERR_TRPM_NO_ACTIVE_TRAP;
155	}
156
157	/*
158	* Reset it.
159	*/
160	pVM->trpm.s.uActiveVector = ~0U;
161	return VINF_SUCCESS;
162	}
163
164
165	/**
166	* Assert trap/exception/interrupt.
167	*
168	* The caller is responsible for making sure there is no active trap
169	* when making this request.
170	*
171	* @returns VBox status code.
172	* @param pVM The virtual machine.
173	* @param u8TrapNo The trap vector to assert.
174	* @param enmType Trap type.
175	*/
176	TRPMDECL(int) TRPMAssertTrap(PVM pVM, uint8_t u8TrapNo, TRPMEVENT enmType)
177	{
178	Log2(("TRPMAssertTrap: u8TrapNo=%02x type=%d\n", u8TrapNo, enmType));
179
180	/*
181	* Cannot assert a trap when one is already active.
182	*/
183	if (pVM->trpm.s.uActiveVector != ~0U)
184	{
185	AssertMsgFailed(("Active trap %#x\n", pVM->trpm.s.uActiveVector));
186	return VERR_TRPM_ACTIVE_TRAP;
187	}
188
189	pVM->trpm.s.uActiveVector = u8TrapNo;
190	pVM->trpm.s.enmActiveType = enmType;
191	pVM->trpm.s.uActiveErrorCode = ~0;
192	pVM->trpm.s.uActiveCR2 = 0xdeadface;
193	return VINF_SUCCESS;
194	}
195
196
197	/**
198	* Sets the error code of the current trap.
199	* (This function is for use in trap handlers and such.)
200	*
201	* The caller is responsible for making sure there is an active trap
202	* which takes an errorcode when making this request.
203	*
204	* @param pVM The virtual machine.
205	* @param uErrorCode The new error code.
206	*/
207	TRPMDECL(void) TRPMSetErrorCode(PVM pVM, RTGCUINT uErrorCode)
208	{
209	Log2(("TRPMSetErrorCode: uErrorCode=%VGv\n", uErrorCode));
210	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
211	pVM->trpm.s.uActiveErrorCode = uErrorCode;
212	#ifdef VBOX_STRICT
213	switch (pVM->trpm.s.uActiveVector)
214	{
215	case 0x0a: case 0x0b: case 0x0c: case 0x0d: case 0x0e:
216	AssertMsg(uErrorCode != ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
217	break;
218	case 0x11: case 0x08:
219	AssertMsg(uErrorCode == 0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
220	break;
221	default:
222	AssertMsg(uErrorCode == ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
223	break;
224	}
225	#endif
226	}
227
228
229	/**
230	* Sets the error code of the current trap.
231	* (This function is for use in trap handlers and such.)
232	*
233	* The caller is responsible for making sure there is an active trap 0e
234	* when making this request.
235	*
236	* @param pVM The virtual machine.
237	* @param uCR2 The new fault address (cr2 register).
238	*/
239	TRPMDECL(void) TRPMSetFaultAddress(PVM pVM, RTGCUINTPTR uCR2)
240	{
241	Log2(("TRPMSetFaultAddress: uCR2=%VGv\n", uCR2));
242	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
243	AssertMsg(pVM->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
244	pVM->trpm.s.uActiveCR2 = uCR2;
245	}
246
247
248	/**
249	* Checks if the current active trap/interrupt/exception/fault/whatever is a software
250	* interrupt or not.
251	*
252	* The caller is responsible for making sure there is an active trap
253	* when making this request.
254	*
255	* @returns true if software interrupt, false if not.
256	*
257	* @param pVM VM handle.
258	*/
259	TRPMDECL(bool) TRPMIsSoftwareInterrupt(PVM pVM)
260	{
261	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
262	return (pVM->trpm.s.enmActiveType == TRPM_SOFTWARE_INT);
263	}
264
265
266	/**
267	* Check if there is an active trap.
268	*
269	* @returns true if trap active, false if not.
270	* @param pVM The virtual machine.
271	*/
272	TRPMDECL(bool) TRPMHasTrap(PVM pVM)
273	{
274	return pVM->trpm.s.uActiveVector != ~0U;
275	}
276
277
278	/**
279	* Query all info about the current active trap/interrupt.
280	* If no trap is active active an error code is returned.
281	*
282	* @returns VBox status code.
283	* @param pVM The virtual machine.
284	* @param pu8TrapNo Where to store the trap number.
285	* @param pEnmType Where to store the trap type
286	* @param puErrorCode Where to store the error code associated with some traps.
287	* ~0U is stored if the trap has no error code.
288	* @param puCR2 Where to store the CR2 associated with a trap 0E.
289	*/
290	TRPMDECL(int) TRPMQueryTrapAll(PVM pVM, uint8_t pu8TrapNo, TRPMEVENT pEnmType, PRTGCUINT puErrorCode, PRTGCUINTPTR puCR2)
291	{
292	/*
293	* Check if we have a trap at present.
294	*/
295	if (pVM->trpm.s.uActiveVector == ~0U)
296	return VERR_TRPM_NO_ACTIVE_TRAP;
297
298	if (pu8TrapNo)
299	*pu8TrapNo = (uint8_t)pVM->trpm.s.uActiveVector;
300	if (pEnmType)
301	*pEnmType = pVM->trpm.s.enmActiveType;
302	if (puErrorCode)
303	*puErrorCode = pVM->trpm.s.uActiveErrorCode;
304	if (puCR2)
305	*puCR2 = pVM->trpm.s.uActiveCR2;
306
307	return VINF_SUCCESS;
308	}
309
310
311	/**
312	* Save the active trap.
313	*
314	* This routine useful when doing try/catch in the hypervisor.
315	* Any function which uses temporary trap handlers should
316	* probably also use this facility to save the original trap.
317	*
318	* @param pVM VM handle.
319	*/
320	TRPMDECL(void) TRPMSaveTrap(PVM pVM)
321	{
322	pVM->trpm.s.uSavedVector = pVM->trpm.s.uActiveVector;
323	pVM->trpm.s.enmSavedType = pVM->trpm.s.enmActiveType;
324	pVM->trpm.s.uSavedErrorCode = pVM->trpm.s.uActiveErrorCode;
325	pVM->trpm.s.uSavedCR2 = pVM->trpm.s.uActiveCR2;
326	}
327
328
329	/**
330	* Restore a saved trap.
331	*
332	* Multiple restores of a saved trap is possible.
333	*
334	* @param pVM VM handle.
335	*/
336	TRPMDECL(void) TRPMRestoreTrap(PVM pVM)
337	{
338	pVM->trpm.s.uActiveVector = pVM->trpm.s.uSavedVector;
339	pVM->trpm.s.enmActiveType = pVM->trpm.s.enmSavedType;
340	pVM->trpm.s.uActiveErrorCode = pVM->trpm.s.uSavedErrorCode;
341	pVM->trpm.s.uActiveCR2 = pVM->trpm.s.uSavedCR2;
342	}
343
344
345	/**
346	* Forward trap or interrupt to the guest's handler
347	*
348	*
349	* @returns VBox status code.
350	* or does not return at all (when the trap is actually forwarded)
351	*
352	* @param pVM The VM to operate on.
353	* @param pRegFrame Pointer to the register frame for the trap.
354	* @param iGate Trap or interrupt gate number
355	* @param opsize Instruction size (only relevant for software interrupts)
356	* @param enmError TRPM_TRAP_HAS_ERRORCODE or TRPM_TRAP_NO_ERRORCODE.
357	* @param enmType TRPM event type
358	* @internal
359	*/
360	TRPMDECL(int) TRPMForwardTrap(PVM pVM, PCPUMCTXCORE pRegFrame, uint32_t iGate, uint32_t opsize, TRPMERRORCODE enmError, TRPMEVENT enmType)
361	{
362	#ifdef TRPM_FORWARD_TRAPS_IN_GC
363	X86EFLAGS eflags;
364
365	STAM_PROFILE_ADV_START(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
366
367	#ifdef DEBUG
368	if (pRegFrame->eflags.Bits.u1VM)
369	Log(("TRPMForwardTrap-VM: eip=%04X:%04X iGate=%d\n", pRegFrame->cs, pRegFrame->eip, iGate));
370	else
371	Log(("TRPMForwardTrap: eip=%04X:%VGv iGate=%d\n", pRegFrame->cs, pRegFrame->eip, iGate));
372
373	switch (iGate) {
374	case 14:
375	if (pRegFrame->eip == pVM->trpm.s.uActiveCR2)
376	{
377	int rc;
378	RTGCPTR pCallerGC;
379	#ifdef IN_GC
380	rc = MMGCRamRead(pVM, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
381	#else
382	rc = PGMPhysReadGCPtr(pVM, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
383	#endif
384	if (VBOX_SUCCESS(rc))
385	{
386	Log(("TRPMForwardTrap: caller=%VGv\n", pCallerGC));
387	}
388	}
389	/* no break */
390	case 8:
391	case 10:
392	case 11:
393	case 12:
394	case 13:
395	case 17:
396	Assert(enmError == TRPM_TRAP_HAS_ERRORCODE);
397	break;
398	default:
399	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
400	break;
401	}
402	#endif /* DEBUG */
403
404	/* Retrieve the eflags including the virtualized bits. */
405	/* Note: hackish as the cpumctxcore structure doesn't contain the right value */
406	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
407
408	/* VM_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
409	Assert(enmType != TRPM_HARDWARE_INT \|\| !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS));
410
411	/*
412	* 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.
413	* Well, only if the IF flag is set.
414	*/
415	/*
416	* @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.
417	*
418	*/
419	if ( pVM->trpm.s.aGuestTrapHandler[iGate]
420	&& (eflags.Bits.u1IF)
421	#ifndef VBOX_RAW_V86
422	&& !(eflags.Bits.u1VM) /* @todo implement when needed (illegal for same privilege level transfers). */
423	#endif
424	&& !PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)
425	)
426	{
427	uint16_t cbIDT;
428	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVM, &cbIDT);
429	uint32_t cpl;
430	VBOXIDTE GuestIdte;
431	RTGCPTR pIDTEntry;
432	int rc;
433
434	Assert(PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame));
435	Assert(!VM_FF_ISPENDING(pVM, VM_FF_SELM_SYNC_GDT \| VM_FF_SELM_SYNC_LDT \| VM_FF_TRPM_SYNC_IDT \| VM_FF_SELM_SYNC_TSS));
436
437	/* Get the current privilege level. */
438	cpl = CPUMGetGuestCPL(pVM, pRegFrame);
439
440	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
441	goto failure;
442
443	/*
444	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
445	* All very obscure, but still necessary.
446	* Currently only some CS & TSS selector checks are missing.
447	*
448	*/
449	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
450	#ifdef IN_GC
451	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
452	#else
453	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
454	#endif
455	if (VBOX_FAILURE(rc))
456	{
457	/* The page might be out of sync. (@todo might cross a page boundary) */
458	Log(("Page %VGv out of sync -> prefetch and try again\n", pIDTEntry));
459	rc = PGMPrefetchPage(pVM, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
460	if (rc != VINF_SUCCESS)
461	{
462	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Vrc\n", rc));
463	goto failure;
464	}
465	#ifdef IN_GC
466	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
467	#else
468	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
469	#endif
470	}
471	if ( VBOX_SUCCESS(rc)
472	&& GuestIdte.Gen.u1Present
473	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
474	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
475	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
476	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
477	)
478	{
479	RTGCPTR pHandler, dummy;
480	GCPTRTYPE(uint32_t *) pTrapStackGC;
481	#ifndef IN_GC
482	HCPTRTYPE(uint32_t *) pTrapStackHC;
483	#endif
484
485	pHandler = (RTGCPTR)((GuestIdte.Gen.u16OffsetHigh << 16) \| GuestIdte.Gen.u16OffsetLow);
486
487	/* Note: SELMValidateAndConvertCSAddr checks for code type, memory type, selector validity. */
488	/** @todo dpl <= cpl else GPF */
489
490	/* Note: don't use current eflags as we might be in V86 mode and the IDT always contains protected mode selectors */
491	X86EFLAGS fakeflags;
492	fakeflags.u32 = 0;
493
494	rc = SELMValidateAndConvertCSAddr(pVM, fakeflags, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
495	if (rc == VINF_SUCCESS)
496	{
497	VBOXGDTR gdtr = {0};
498	bool fConforming = false;
499	int idx = 0;
500	uint32_t dpl;
501	uint32_t ss_r0;
502	uint32_t esp_r0;
503	VBOXDESC Desc;
504	RTGCPTR pGdtEntry;
505
506	CPUMGetGuestGDTR(pVM, &gdtr);
507	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
508
509	if (!gdtr.pGdt)
510	goto failure;
511
512	pGdtEntry = (RTGCPTR)(uintptr_t)&((VBOXDESC *)gdtr.pGdt)[GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT]; /// @todo fix this
513	#ifdef IN_GC
514	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
515	#else
516	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
517	#endif
518	if (VBOX_FAILURE(rc))
519	{
520	/* The page might be out of sync. (@todo might cross a page boundary) */
521	Log(("Page %VGv out of sync -> prefetch and try again\n", pGdtEntry));
522	rc = PGMPrefetchPage(pVM, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
523	if (rc != VINF_SUCCESS)
524	{
525	Log(("PGMPrefetchPage failed with rc=%Vrc\n", rc));
526	goto failure;
527	}
528	#ifdef IN_GC
529	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
530	#else
531	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
532	#endif
533	if (VBOX_FAILURE(rc))
534	{
535	Log(("MMGCRamRead failed with %Vrc\n", rc));
536	goto failure;
537	}
538	}
539
540	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
541	{
542	Log(("Conforming code selector\n"));
543	fConforming = true;
544	}
545	/** @todo check descriptor type!! */
546
547	dpl = Desc.Gen.u2Dpl;
548
549	if (!fConforming && dpl < cpl) /* to inner privilege level */
550	{
551	rc = SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
552	if (VBOX_FAILURE(rc))
553	goto failure;
554
555	Assert((ss_r0 & X86_SEL_RPL) == 1);
556
557	if ( !esp_r0
558	\|\| !ss_r0
559	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
560	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
561	)
562	{
563	Log(("Invalid ring 0 stack %04X:%VGv\n", ss_r0, esp_r0));
564	goto failure;
565	}
566	}
567	else
568	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
569	{
570	ss_r0 = pRegFrame->ss;
571	esp_r0 = pRegFrame->esp;
572
573	if ( eflags.Bits.u1VM /* illegal */
574	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
575	{
576	AssertMsgFailed(("Invalid stack %04X:%VGv??? (VM=%d)\n", ss_r0, esp_r0, eflags.Bits.u1VM));
577	goto failure;
578	}
579	}
580	else
581	{
582	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
583	goto failure;
584	}
585	/*
586	* Build trap stack frame on guest handler's stack
587	*/
588	#ifdef IN_GC
589	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss & X86_SEL_RPL) != 0);
590	/* Check maximum amount we need (10 when executing in V86 mode) */
591	rc = PGMVerifyAccess(pVM, (RTGCUINTPTR)pTrapStackGC - 10sizeof(uint32_t), 10 sizeof(uint32_t), X86_PTE_RW);
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 ( PAGE_ADDRESS(pTrapStackGC) != PAGE_ADDRESS(pTrapStackGC - 10sizeof(uint32_t)) / fail if we cross a page boundary */
596	\|\| VBOX_FAILURE((rc = PGMPhysGCPtr2HCPtr(pVM, pTrapStackGC, (PRTHCPTR)&pTrapStackHC)))
597	)
598	{
599	AssertRC(rc);
600	goto failure;
601	}
602	#endif
603	if (rc == VINF_SUCCESS)
604	{
605	/** if eflags.Bits.u1VM then push gs, fs, ds, es */
606	if (eflags.Bits.u1VM)
607	{
608	Log(("TRAP%02X: (VM) Handler %04X:%08X Stack %04X:%08X RPL=%d CR2=%08X\n", iGate, GuestIdte.Gen.u16SegSel, pHandler, ss_r0, esp_r0, (pRegFrame->ss & X86_SEL_RPL), pVM->trpm.s.uActiveCR2));
609	CTXSUFF(pTrapStack)[--idx] = pRegFrame->gs;
610	CTXSUFF(pTrapStack)[--idx] = pRegFrame->fs;
611	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ds;
612	CTXSUFF(pTrapStack)[--idx] = pRegFrame->es;
613
614	/* clear ds, es, fs & gs in current context */
615	pRegFrame->ds = pRegFrame->es = pRegFrame->fs = pRegFrame->gs = 0;
616	}
617	else
618	Log(("TRAP%02X: Handler %04X:%08X Stack %04X:%08X RPL=%d CR2=%08X\n", iGate, GuestIdte.Gen.u16SegSel, pHandler, ss_r0, esp_r0, (pRegFrame->ss & X86_SEL_RPL), pVM->trpm.s.uActiveCR2));
619
620	if (!fConforming && dpl < cpl)
621	{
622	if ((pRegFrame->ss & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
623	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ss & ~1; /* Mask away traces of raw ring execution (ring 1). */
624	else
625	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ss;
626
627	CTXSUFF(pTrapStack)[--idx] = pRegFrame->esp;
628	}
629
630	/* Note: We use the eflags copy, that includes the virtualized bits! */
631	/* Note: Not really necessary as we grab include those bits in the trap/irq handler trampoline */
632	CTXSUFF(pTrapStack)[--idx] = eflags.u32;
633
634	if ((pRegFrame->cs & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
635	CTXSUFF(pTrapStack)[--idx] = pRegFrame->cs & ~1; /* Mask away traces of raw ring execution (ring 1). */
636	else
637	CTXSUFF(pTrapStack)[--idx] = pRegFrame->cs;
638
639	if (enmType == TRPM_SOFTWARE_INT)
640	{
641	Assert(opsize);
642	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eip + opsize; /* return address = next instruction */
643	}
644	else
645	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eip;
646
647	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
648	{
649	CTXSUFF(pTrapStack)[--idx] = pVM->trpm.s.uActiveErrorCode;
650	}
651
652	Assert(esp_r0 > -idx*sizeof(uint32_t));
653	/* Adjust ESP accordingly */
654	esp_r0 += idx*sizeof(uint32_t);
655
656	/* Mask away dangerous flags for the trap/interrupt handler. */
657	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
658	#ifdef DEBUG
659	for (int j=idx;j<0;j++)
660	{
661	LogFlow(("Stack %VGv pos %02d: %08x\n", &CTXSUFF(pTrapStack)[j], j, CTXSUFF(pTrapStack)[j]));
662	}
663	const char *pszPrefix = "";
664	const char *szEFlags = "";
665
666	LogFlow(( "%seax=%08x %sebx=%08x %secx=%08x %sedx=%08x %sesi=%08x %sedi=%08x\n"
667	"%seip=%08x %sesp=%08x %sebp=%08x %siopl=%d %*s\n"
668	"%scs=%04x %sds=%04x %ses=%04x %sfs=%04x %sgs=%04x %seflags=%08x\n",
669	pszPrefix, pRegFrame->eax, pszPrefix, pRegFrame->ebx, pszPrefix, pRegFrame->ecx, pszPrefix, pRegFrame->edx, pszPrefix, pRegFrame->esi, pszPrefix, pRegFrame->edi,
670	pszPrefix, pRegFrame->eip, pszPrefix, pRegFrame->esp, pszPrefix, pRegFrame->ebp, pszPrefix, eflags.Bits.u2IOPL, *pszPrefix ? 33 : 31, szEFlags,
671	pszPrefix, (RTSEL)pRegFrame->cs, pszPrefix, (RTSEL)pRegFrame->ds, pszPrefix, (RTSEL)pRegFrame->es,
672	pszPrefix, (RTSEL)pRegFrame->fs, pszPrefix, (RTSEL)pRegFrame->gs, pszPrefix, eflags.u32));
673	#endif
674
675	Log(("PATM Handler %VGv 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));
676
677	/* Make sure the internal guest context structure is up-to-date. */
678	CPUMSetGuestCR2(pVM, pVM->trpm.s.uActiveCR2);
679
680	#ifdef IN_GC
681	/* Note: shouldn't be necessary */
682	ASMSetCR2(pVM->trpm.s.uActiveCR2);
683
684	/* Turn off interrupts for interrupt gates. */
685	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
686	CPUMRawSetEFlags(pVM, pRegFrame, eflags.u32 & ~X86_EFL_IF);
687
688	/* The virtualized bits must be removed again!! */
689	eflags.Bits.u1IF = 1;
690	eflags.Bits.u2IOPL = 0;
691
692	Assert(eflags.Bits.u1IF);
693	Assert(eflags.Bits.u2IOPL == 0);
694	STAM_COUNTER_INC(&pVM->trpm.s.CTXALLSUFF(paStatForwardedIRQ)[iGate]);
695	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
696
697	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate], eflags.u32, ss_r0, (RTGCPTR)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(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
711	return VINF_SUCCESS;
712	#endif
713	}
714	else
715	Log(("TRAP%02X: PGMVerifyAccess %VGv failed with %Vrc -> forward to REM\n", iGate, pTrapStackGC, rc));
716	}
717	else
718	Log(("SELMValidateAndConvertCSAddr failed with %Vrc\n", rc));
719	}
720	else
721	Log(("MMRamRead %VGv size %d failed with %Vrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
722	}
723	else
724	{
725	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
726	#ifdef VBOX_WITH_STATISTICS
727	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
728	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
729	else
730	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
731	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
732	#endif
733	}
734	failure:
735	STAM_COUNTER_INC(&CTXSUFF(pVM->trpm.s.StatForwardFail));
736	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.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
743
744	/**
745	* Raises a cpu exception which doesn't take an error code.
746	*
747	* This function may or may not dispatch the exception before returning.
748	*
749	* @returns VBox status code fit for scheduling.
750	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
751	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
752	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
753	*
754	* @param pVM The VM handle.
755	* @param pCtxCore The CPU context core.
756	* @param enmXcpt The exception.
757	*/
758	TRPMDECL(int) TRPMRaiseXcpt(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
759	{
760	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs, pCtxCore->eip, enmXcpt));
761	/** @todo dispatch the trap. */
762	pVM->trpm.s.uActiveVector = enmXcpt;
763	pVM->trpm.s.enmActiveType = TRPM_TRAP;
764	pVM->trpm.s.uActiveErrorCode = 0xdeadbeef;
765	pVM->trpm.s.uActiveCR2 = 0xdeadface;
766	return VINF_EM_RAW_GUEST_TRAP;
767	}
768
769
770	/**
771	* Raises a cpu exception with an errorcode.
772	*
773	* This function may or may not dispatch the exception before returning.
774	*
775	* @returns VBox status code fit for scheduling.
776	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
777	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
778	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
779	*
780	* @param pVM The VM handle.
781	* @param pCtxCore The CPU context core.
782	* @param enmXcpt The exception.
783	* @param uErr The error code.
784	*/
785	TRPMDECL(int) TRPMRaiseXcptErr(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
786	{
787	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr));
788	/** @todo dispatch the trap. */
789	pVM->trpm.s.uActiveVector = enmXcpt;
790	pVM->trpm.s.enmActiveType = TRPM_TRAP;
791	pVM->trpm.s.uActiveErrorCode = uErr;
792	pVM->trpm.s.uActiveCR2 = 0xdeadface;
793	return VINF_EM_RAW_GUEST_TRAP;
794	}
795
796
797	/**
798	* Raises a cpu exception with an errorcode and CR2.
799	*
800	* This function may or may not dispatch the exception before returning.
801	*
802	* @returns VBox status code fit for scheduling.
803	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
804	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
805	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
806	*
807	* @param pVM The VM handle.
808	* @param pCtxCore The CPU context core.
809	* @param enmXcpt The exception.
810	* @param uErr The error code.
811	* @param uCR2 The CR2 value.
812	*/
813	TRPMDECL(int) TRPMRaiseXcptErrCR2(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
814	{
815	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr, uCR2));
816	/** @todo dispatch the trap. */
817	pVM->trpm.s.uActiveVector = enmXcpt;
818	pVM->trpm.s.enmActiveType = TRPM_TRAP;
819	pVM->trpm.s.uActiveErrorCode = uErr;
820	pVM->trpm.s.uActiveCR2 = uCR2;
821	return VINF_EM_RAW_GUEST_TRAP;
822	}
823
824
825	/**
826	* Clear guest trap/interrupt gate handler
827	*
828	* @returns VBox status code.
829	* @param pVM The VM to operate on.
830	* @param iTrap Interrupt/trap number.
831	*/
832	TRPMDECL(int) trpmClearGuestTrapHandler(PVM pVM, unsigned iTrap)
833	{
834	/*
835	* Validate.
836	*/
837	if (iTrap >= ELEMENTS(pVM->trpm.s.aIdt))
838	{
839	AssertMsg(iTrap < TRPM_HANDLER_INT_BASE, ("Illegal gate number %d!\n", iTrap));
840	return VERR_INVALID_PARAMETER;
841	}
842
843	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
844	#ifdef IN_RING3
845	trpmR3ClearPassThroughHandler(pVM, iTrap);
846	#else
847	AssertFailed();
848	#endif
849
850	pVM->trpm.s.aGuestTrapHandler[iTrap] = TRPM_INVALID_HANDLER;
851	return VINF_SUCCESS;
852	}
853
854

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source: vbox/trunk/src/VBox/VMM/VMMAll/TRPMAll.cpp@ 3313

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