TRPMAll.cpp@ 1943

Last change on this file since 1943 was 1930, checked in by vboxsync, 18 years ago
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1	/* $Id: TRPMAll.cpp 1930 2007-04-04 13:18:48Z vboxsync $ */
2	/** @file
3	* TRPM - Trap Monitor - Any Context.
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_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 pfSoftwareInterrupt Where to store the software interrupt indicator.
53	*/
54	TRPMDECL(int) TRPMQueryTrap(PVM pVM, uint8_t pu8TrapNo, bool pfSoftwareInterrupt)
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 (pfSoftwareInterrupt)
64	*pfSoftwareInterrupt = !!pVM->trpm.s.fActiveSoftwareInterrupt;
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 fSoftwareInterrupt Indicate if it's a software interrupt or not.
175	*/
176	TRPMDECL(int) TRPMAssertTrap(PVM pVM, uint8_t u8TrapNo, bool fSoftwareInterrupt)
177	{
178	Log2(("TRPMAssertTrap: u8TrapNo=%02x fSoftwareInterrupt=%d\n", u8TrapNo, fSoftwareInterrupt));
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.fActiveSoftwareInterrupt = fSoftwareInterrupt;
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.fActiveSoftwareInterrupt;
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 pfSoftwareInterrupt Where to store the software interrupt indicator.
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, bool pfSoftwareInterrupt, 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 (pfSoftwareInterrupt)
301	*pfSoftwareInterrupt = !!pVM->trpm.s.fActiveSoftwareInterrupt;
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.fSavedSoftwareInterrupt = pVM->trpm.s.fActiveSoftwareInterrupt;
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.fActiveSoftwareInterrupt = pVM->trpm.s.fSavedSoftwareInterrupt;
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
436	/* Get the current privilege level. */
437	cpl = CPUMGetGuestCPL(pVM, pRegFrame);
438
439	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
440	goto failure;
441
442	/*
443	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
444	* All very obscure, but still necessary.
445	* Currently only some CS & TSS selector checks are missing.
446	*
447	*/
448	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
449	#ifdef IN_GC
450	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
451	#else
452	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
453	#endif
454	if (VBOX_FAILURE(rc))
455	{
456	/* The page might be out of sync. (@todo might cross a page boundary) */
457	Log(("Page %VGv out of sync -> prefetch and try again\n", pIDTEntry));
458	rc = PGMPrefetchPage(pVM, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
459	if (rc != VINF_SUCCESS)
460	{
461	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Vrc\n", rc));
462	goto failure;
463	}
464	#ifdef IN_GC
465	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
466	#else
467	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
468	#endif
469	}
470	if ( VBOX_SUCCESS(rc)
471	&& GuestIdte.Gen.u1Present
472	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
473	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
474	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
475	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
476	)
477	{
478	RTGCPTR pHandler, dummy;
479	GCPTRTYPE(uint32_t *)pTrapStackGC;
480	#ifndef IN_GC
481	HCPTRTYPE(uint32_t *)pTrapStackHC;
482	#endif
483
484	pHandler = (RTGCPTR)((GuestIdte.Gen.u16OffsetHigh << 16) \| GuestIdte.Gen.u16OffsetLow);
485
486	/* Note: SELMValidateAndConvertCSAddr checks for code type, memory type, selector validity. */
487	/** @todo dpl <= cpl else GPF */
488
489	/* Note: don't use current eflags as we might be in V86 mode and the IDT always contains protected mode selectors */
490	X86EFLAGS fakeflags;
491	fakeflags.u32 = 0;
492
493	rc = SELMValidateAndConvertCSAddr(pVM, fakeflags, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
494	if (rc == VINF_SUCCESS)
495	{
496	VBOXGDTR gdtr = {0};
497	bool fConforming = false;
498	int idx = 0;
499	uint32_t dpl;
500	uint32_t ss_r0;
501	uint32_t esp_r0;
502	VBOXDESC Desc;
503	RTGCPTR pGdtEntry;
504
505	CPUMGetGuestGDTR(pVM, &gdtr);
506	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
507
508	if (!gdtr.pGdt)
509	goto failure;
510
511	pGdtEntry = (RTGCPTR)(uintptr_t)&((VBOXDESC *)gdtr.pGdt)[GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT]; /// @todo fix this
512	#ifdef IN_GC
513	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
514	#else
515	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
516	#endif
517	if (VBOX_FAILURE(rc))
518	{
519	/* The page might be out of sync. (@todo might cross a page boundary) */
520	Log(("Page %VGv out of sync -> prefetch and try again\n", pGdtEntry));
521	rc = PGMPrefetchPage(pVM, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
522	if (rc != VINF_SUCCESS)
523	{
524	Log(("PGMPrefetchPage failed with rc=%Vrc\n", rc));
525	goto failure;
526	}
527	#ifdef IN_GC
528	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
529	#else
530	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
531	#endif
532	if (VBOX_FAILURE(rc))
533	{
534	Log(("MMGCRamRead failed with %Vrc\n", rc));
535	goto failure;
536	}
537	}
538
539	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
540	{
541	Log(("Conforming code selector\n"));
542	fConforming = true;
543	}
544	/** @todo check descriptor type!! */
545
546	dpl = Desc.Gen.u2Dpl;
547
548	if (!fConforming && dpl < cpl) /* to inner privilege level */
549	{
550	rc = SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
551	if (VBOX_FAILURE(rc))
552	goto failure;
553
554	Assert((ss_r0 & X86_SEL_RPL) == 1);
555
556	if ( !esp_r0
557	\|\| !ss_r0
558	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
559	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
560	)
561	{
562	Log(("Invalid ring 0 stack %04X:%VGv\n", ss_r0, esp_r0));
563	goto failure;
564	}
565	}
566	else
567	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
568	{
569	ss_r0 = pRegFrame->ss;
570	esp_r0 = pRegFrame->esp;
571
572	if ( eflags.Bits.u1VM /* illegal */
573	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
574	{
575	AssertMsgFailed(("Invalid stack %04X:%VGv??? (VM=%d)\n", ss_r0, esp_r0, eflags.Bits.u1VM));
576	goto failure;
577	}
578	}
579	else
580	{
581	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
582	goto failure;
583	}
584	/*
585	* Build trap stack frame on guest handler's stack
586	*/
587	#ifdef IN_GC
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(pVM, (RTGCUINTPTR)pTrapStackGC - 10sizeof(uint32_t), 10 sizeof(uint32_t), X86_PTE_RW);
591	#else
592	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss & X86_SEL_RPL) == 0 \|\| (pRegFrame->ss & X86_SEL_RPL) == 3);
593	/* Check maximum amount we need (10 when executing in V86 mode) */
594	if ( PAGE_ADDRESS(pTrapStackGC) != PAGE_ADDRESS(pTrapStackGC - 10sizeof(uint32_t)) / fail if we cross a page boundary */
595	\|\| VBOX_FAILURE((rc = PGMPhysGCPtr2HCPtr(pVM, pTrapStackGC, (PRTHCPTR)&pTrapStackHC)))
596	)
597	{
598	AssertRC(rc);
599	goto failure;
600	}
601	#endif
602	if (rc == VINF_SUCCESS)
603	{
604	/** if eflags.Bits.u1VM then push gs, fs, ds, es */
605	if (eflags.Bits.u1VM)
606	{
607	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));
608	CTXSUFF(pTrapStack)[--idx] = pRegFrame->gs;
609	CTXSUFF(pTrapStack)[--idx] = pRegFrame->fs;
610	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ds;
611	CTXSUFF(pTrapStack)[--idx] = pRegFrame->es;
612
613	/* clear ds, es, fs & gs in current context */
614	pRegFrame->ds = pRegFrame->es = pRegFrame->fs = pRegFrame->gs = 0;
615	}
616	else
617	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));
618
619	if (!fConforming && dpl < cpl)
620	{
621	if ((pRegFrame->ss & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
622	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ss & ~1; /* Mask away traces of raw ring execution (ring 1). */
623	else
624	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ss;
625
626	CTXSUFF(pTrapStack)[--idx] = pRegFrame->esp;
627	}
628
629	/* Note: We use the eflags copy, that includes the virtualized bits! */
630	/* Note: Not really necessary as we grab include those bits in the trap/irq handler trampoline */
631	CTXSUFF(pTrapStack)[--idx] = eflags.u32;
632
633	if ((pRegFrame->cs & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
634	CTXSUFF(pTrapStack)[--idx] = pRegFrame->cs & ~1; /* Mask away traces of raw ring execution (ring 1). */
635	else
636	CTXSUFF(pTrapStack)[--idx] = pRegFrame->cs;
637
638	if (enmType == TRPM_SOFTWARE_INT)
639	{
640	Assert(opsize);
641	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eip + opsize; /* return address = next instruction */
642	}
643	else
644	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eip;
645
646	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
647	{
648	CTXSUFF(pTrapStack)[--idx] = pVM->trpm.s.uActiveErrorCode;
649	}
650
651	Assert(esp_r0 > -idx*sizeof(uint32_t));
652	/* Adjust ESP accordingly */
653	esp_r0 += idx*sizeof(uint32_t);
654
655	/* Mask away dangerous flags for the trap/interrupt handler. */
656	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
657	#ifdef DEBUG
658	for (int j=idx;j<0;j++)
659	{
660	LogFlow(("Stack %VGv pos %02d: %08x\n", &CTXSUFF(pTrapStack)[j], j, CTXSUFF(pTrapStack)[j]));
661	}
662	char *pszPrefix = "";
663	char *szEFlags = "";
664
665	LogFlow(( "%seax=%08x %sebx=%08x %secx=%08x %sedx=%08x %sesi=%08x %sedi=%08x\n"
666	"%seip=%08x %sesp=%08x %sebp=%08x %siopl=%d %*s\n"
667	"%scs=%04x %sds=%04x %ses=%04x %sfs=%04x %sgs=%04x %seflags=%08x\n",
668	pszPrefix, pRegFrame->eax, pszPrefix, pRegFrame->ebx, pszPrefix, pRegFrame->ecx, pszPrefix, pRegFrame->edx, pszPrefix, pRegFrame->esi, pszPrefix, pRegFrame->edi,
669	pszPrefix, pRegFrame->eip, pszPrefix, pRegFrame->esp, pszPrefix, pRegFrame->ebp, pszPrefix, eflags.Bits.u2IOPL, *pszPrefix ? 33 : 31, szEFlags,
670	pszPrefix, (RTSEL)pRegFrame->cs, pszPrefix, (RTSEL)pRegFrame->ds, pszPrefix, (RTSEL)pRegFrame->es,
671	pszPrefix, (RTSEL)pRegFrame->fs, pszPrefix, (RTSEL)pRegFrame->gs, pszPrefix, eflags.u32));
672	#endif
673
674	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));
675
676	/* Make sure the internal guest context structure is up-to-date. */
677	CPUMSetGuestCR2(pVM, pVM->trpm.s.uActiveCR2);
678
679	#ifdef IN_GC
680	/* Note: shouldn't be necessary */
681	ASMSetCR2(pVM->trpm.s.uActiveCR2);
682
683	/* Turn off interrupts for interrupt gates. */
684	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
685	CPUMRawSetEFlags(pVM, pRegFrame, eflags.u32 & ~X86_EFL_IF);
686
687	/* The virtualized bits must be removed again!! */
688	eflags.Bits.u1IF = 1;
689	eflags.Bits.u2IOPL = 0;
690
691	Assert(eflags.Bits.u1IF);
692	Assert(eflags.Bits.u2IOPL == 0);
693	STAM_COUNTER_INC(&pVM->trpm.s.CTXALLSUFF(paStatForwardedIRQ)[iGate]);
694	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
695
696	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate], eflags.u32, ss_r0, (RTGCPTR)esp_r0);
697	/* does not return */
698	#else
699	/* Turn off interrupts for interrupt gates. */
700	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
701	eflags.Bits.u1IF = 0;
702
703	pRegFrame->eflags.u32 = eflags.u32;
704
705	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
706	pRegFrame->cs = GuestIdte.Gen.u16SegSel;
707	pRegFrame->esp = esp_r0;
708	pRegFrame->ss = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
709	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
710	return VINF_SUCCESS;
711	#endif
712	}
713	else
714	Log(("TRAP%02X: PGMVerifyAccess %VGv failed with %Vrc -> forward to REM\n", iGate, pTrapStackGC, rc));
715	}
716	else
717	Log(("SELMValidateAndConvertCSAddr failed with %Vrc\n", rc));
718	}
719	else
720	Log(("MMRamRead %VGv size %d failed with %Vrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
721	}
722	else
723	{
724	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
725	#ifdef VBOX_WITH_STATISTICS
726	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
727	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
728	else
729	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
730	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
731	#endif
732	}
733	failure:
734	STAM_COUNTER_INC(&CTXSUFF(pVM->trpm.s.StatForwardFail));
735	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
736
737	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]));
738	#endif
739	return VINF_EM_RAW_GUEST_TRAP;
740	}
741
742
743	/**
744	* Raises a cpu exception which doesn't take an error code.
745	*
746	* This function may or may not dispatch the exception before returning.
747	*
748	* @returns VBox status code fit for scheduling.
749	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
750	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
751	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
752	*
753	* @param pVM The VM handle.
754	* @param pCtxCore The CPU context core.
755	* @param enmXcpt The exception.
756	*/
757	TRPMDECL(int) TRPMRaiseXcpt(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
758	{
759	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs, pCtxCore->eip, enmXcpt));
760	/** @todo dispatch the trap. */
761	pVM->trpm.s.uActiveVector = enmXcpt;
762	pVM->trpm.s.fActiveSoftwareInterrupt = false;
763	pVM->trpm.s.uActiveErrorCode = 0xdeadbeef;
764	pVM->trpm.s.uActiveCR2 = 0xdeadface;
765	return VINF_EM_RAW_GUEST_TRAP;
766	}
767
768
769	/**
770	* Raises a cpu exception with an errorcode.
771	*
772	* This function may or may not dispatch the exception before returning.
773	*
774	* @returns VBox status code fit for scheduling.
775	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
776	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
777	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
778	*
779	* @param pVM The VM handle.
780	* @param pCtxCore The CPU context core.
781	* @param enmXcpt The exception.
782	* @param uErr The error code.
783	*/
784	TRPMDECL(int) TRPMRaiseXcptErr(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
785	{
786	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr));
787	/** @todo dispatch the trap. */
788	pVM->trpm.s.uActiveVector = enmXcpt;
789	pVM->trpm.s.fActiveSoftwareInterrupt = false;
790	pVM->trpm.s.uActiveErrorCode = uErr;
791	pVM->trpm.s.uActiveCR2 = 0xdeadface;
792	return VINF_EM_RAW_GUEST_TRAP;
793	}
794
795
796	/**
797	* Raises a cpu exception with an errorcode and CR2.
798	*
799	* This function may or may not dispatch the exception before returning.
800	*
801	* @returns VBox status code fit for scheduling.
802	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
803	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
804	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
805	*
806	* @param pVM The VM handle.
807	* @param pCtxCore The CPU context core.
808	* @param enmXcpt The exception.
809	* @param uErr The error code.
810	* @param uCR2 The CR2 value.
811	*/
812	TRPMDECL(int) TRPMRaiseXcptErrCR2(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
813	{
814	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr, uCR2));
815	/** @todo dispatch the trap. */
816	pVM->trpm.s.uActiveVector = enmXcpt;
817	pVM->trpm.s.fActiveSoftwareInterrupt = false;
818	pVM->trpm.s.uActiveErrorCode = uErr;
819	pVM->trpm.s.uActiveCR2 = uCR2;
820	return VINF_EM_RAW_GUEST_TRAP;
821	}
822
823
824	/**
825	* Clear guest trap/interrupt gate handler
826	*
827	* @returns VBox status code.
828	* @param pVM The VM to operate on.
829	* @param iTrap Interrupt/trap number.
830	*/
831	TRPMDECL(int) trpmClearGuestTrapHandler(PVM pVM, unsigned iTrap)
832	{
833	/*
834	* Validate.
835	*/
836	if (iTrap >= ELEMENTS(pVM->trpm.s.aIdt))
837	{
838	AssertMsg(iTrap < TRPM_HANDLER_INT_BASE, ("Illegal gate number %d!\n", iTrap));
839	return VERR_INVALID_PARAMETER;
840	}
841
842	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
843	#ifdef IN_RING3
844	trpmR3ClearPassThroughHandler(pVM, iTrap);
845	#else
846	AssertFailed();
847	#endif
848
849	pVM->trpm.s.aGuestTrapHandler[iTrap] = TRPM_INVALID_HANDLER;
850	return VINF_SUCCESS;
851	}
852
853

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source: vbox/trunk/src/VBox/VMM/VMMAll/TRPMAll.cpp@ 1943

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