TRPMAll.cpp@ 8170

Last change on this file since 8170 was 8155, checked in by vboxsync, 17 years ago
The Big Sun Rebranding Header Change
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1	/* $Id: TRPMAll.cpp 8155 2008-04-18 15:16:47Z 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 "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	#ifndef IN_RING0
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 \|\| enmType == TRPM_SOFTWARE_INT);
397	break;
398
399	default:
400	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
401	break;
402	}
403	#endif /* DEBUG */
404
405	/* Retrieve the eflags including the virtualized bits. */
406	/* Note: hackish as the cpumctxcore structure doesn't contain the right value */
407	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
408
409	/* VM_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
410	Assert(enmType != TRPM_HARDWARE_INT \|\| !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS));
411
412	/*
413	* 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.
414	* Well, only if the IF flag is set.
415	*/
416	/*
417	* @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.
418	*
419	*/
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, (RTGCPTR)pRegFrame->eip)
426	)
427	{
428	uint16_t cbIDT;
429	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVM, &cbIDT);
430	uint32_t cpl;
431	VBOXIDTE GuestIdte;
432	RTGCPTR pIDTEntry;
433	int rc;
434
435	Assert(PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame));
436	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));
437
438	/* Get the current privilege level. */
439	cpl = CPUMGetGuestCPL(pVM, pRegFrame);
440
441	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
442	goto failure;
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_GC
452	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
453	#else
454	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
455	#endif
456	if (VBOX_FAILURE(rc))
457	{
458	/* The page might be out of sync. (@todo might cross a page boundary) */
459	Log(("Page %VGv out of sync -> prefetch and try again\n", pIDTEntry));
460	rc = PGMPrefetchPage(pVM, 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=%Vrc\n", rc));
464	goto failure;
465	}
466	#ifdef IN_GC
467	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
468	#else
469	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
470	#endif
471	}
472	if ( VBOX_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	GCPTRTYPE(uint32_t *) pTrapStackGC;
482
483	pHandler = (RTGCPTR)((GuestIdte.Gen.u16OffsetHigh << 16) \| GuestIdte.Gen.u16OffsetLow);
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};
496	bool fConforming = false;
497	int idx = 0;
498	uint32_t dpl;
499	uint32_t ss_r0;
500	uint32_t esp_r0;
501	VBOXDESC Desc;
502	RTGCPTR pGdtEntry;
503
504	CPUMGetGuestGDTR(pVM, &gdtr);
505	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
506
507	if (!gdtr.pGdt)
508	goto failure;
509
510	pGdtEntry = (RTGCPTR)(uintptr_t)&((VBOXDESC *)gdtr.pGdt)[GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT]; /// @todo fix this
511	#ifdef IN_GC
512	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
513	#else
514	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
515	#endif
516	if (VBOX_FAILURE(rc))
517	{
518	/* The page might be out of sync. (@todo might cross a page boundary) */
519	Log(("Page %VGv out of sync -> prefetch and try again\n", pGdtEntry));
520	rc = PGMPrefetchPage(pVM, 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=%Vrc\n", rc));
524	goto failure;
525	}
526	#ifdef IN_GC
527	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
528	#else
529	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
530	#endif
531	if (VBOX_FAILURE(rc))
532	{
533	Log(("MMGCRamRead failed with %Vrc\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 (VBOX_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	\|\| SELMToFlatEx(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:%VGv\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	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
573	{
574	AssertMsgFailed(("Invalid stack %04X:%VGv??? (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_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	pTrapStack = 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(pVM, pTrapStackGC, (void **)&pTrapStack, &PageMappingLock);
599	if (VBOX_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:%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));
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:%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));
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] = pVM->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	{
663	LogFlow(("Stack %VGv pos %02d: %08x\n", &pTrapStack[j], j, pTrapStack[j]));
664	}
665	const char *pszPrefix = "";
666	const char *szEFlags = "";
667
668	LogFlow(( "%seax=%08x %sebx=%08x %secx=%08x %sedx=%08x %sesi=%08x %sedi=%08x\n"
669	"%seip=%08x %sesp=%08x %sebp=%08x %siopl=%d %*s\n"
670	"%scs=%04x %sds=%04x %ses=%04x %sfs=%04x %sgs=%04x %seflags=%08x\n",
671	pszPrefix, pRegFrame->eax, pszPrefix, pRegFrame->ebx, pszPrefix, pRegFrame->ecx, pszPrefix, pRegFrame->edx, pszPrefix, pRegFrame->esi, pszPrefix, pRegFrame->edi,
672	pszPrefix, pRegFrame->eip, pszPrefix, pRegFrame->esp, pszPrefix, pRegFrame->ebp, pszPrefix, eflags.Bits.u2IOPL, *pszPrefix ? 33 : 31, szEFlags,
673	pszPrefix, (RTSEL)pRegFrame->cs, pszPrefix, (RTSEL)pRegFrame->ds, pszPrefix, (RTSEL)pRegFrame->es,
674	pszPrefix, (RTSEL)pRegFrame->fs, pszPrefix, (RTSEL)pRegFrame->gs, pszPrefix, eflags.u32));
675	#endif
676
677	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));
678
679	/* Make sure the internal guest context structure is up-to-date. */
680	CPUMSetGuestCR2(pVM, pVM->trpm.s.uActiveCR2);
681
682	#ifdef IN_GC
683	/* Note: shouldn't be necessary */
684	ASMSetCR2(pVM->trpm.s.uActiveCR2);
685
686	/* Turn off interrupts for interrupt gates. */
687	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
688	CPUMRawSetEFlags(pVM, pRegFrame, eflags.u32 & ~X86_EFL_IF);
689
690	/* The virtualized bits must be removed again!! */
691	eflags.Bits.u1IF = 1;
692	eflags.Bits.u2IOPL = 0;
693
694	Assert(eflags.Bits.u1IF);
695	Assert(eflags.Bits.u2IOPL == 0);
696	STAM_COUNTER_INC(&pVM->trpm.s.CTXALLSUFF(paStatForwardedIRQ)[iGate]);
697	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
698
699	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate], eflags.u32, ss_r0, (RTGCPTR)esp_r0);
700	/* does not return */
701	#else
702	/* Turn off interrupts for interrupt gates. */
703	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
704	eflags.Bits.u1IF = 0;
705
706	pRegFrame->eflags.u32 = eflags.u32;
707
708	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
709	pRegFrame->cs = GuestIdte.Gen.u16SegSel;
710	pRegFrame->esp = esp_r0;
711	pRegFrame->ss = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
712	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
713	PGMPhysReleasePageMappingLock(pVM, &PageMappingLock);
714	return VINF_SUCCESS;
715	#endif
716	}
717	else
718	Log(("TRAP%02X: PGMVerifyAccess %VGv failed with %Vrc -> forward to REM\n", iGate, pTrapStackGC, rc));
719	}
720	else
721	Log(("SELMValidateAndConvertCSAddr failed with %Vrc\n", rc));
722	}
723	else
724	Log(("MMRamRead %VGv size %d failed with %Vrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
725	}
726	else
727	{
728	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
729	#ifdef VBOX_WITH_STATISTICS
730	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
731	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
732	else
733	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
734	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
735	#endif
736	}
737	failure:
738	STAM_COUNTER_INC(&CTXSUFF(pVM->trpm.s.StatForwardFail));
739	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
740
741	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]));
742	#endif
743	return VINF_EM_RAW_GUEST_TRAP;
744	}
745	#endif /* !IN_RING0 */
746
747	/**
748	* Raises a cpu exception which doesn't take an error code.
749	*
750	* This function may or may not dispatch the exception before returning.
751	*
752	* @returns VBox status code fit for scheduling.
753	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
754	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
755	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
756	*
757	* @param pVM The VM handle.
758	* @param pCtxCore The CPU context core.
759	* @param enmXcpt The exception.
760	*/
761	TRPMDECL(int) TRPMRaiseXcpt(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
762	{
763	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs, pCtxCore->eip, enmXcpt));
764	/** @todo dispatch the trap. */
765	pVM->trpm.s.uActiveVector = enmXcpt;
766	pVM->trpm.s.enmActiveType = TRPM_TRAP;
767	pVM->trpm.s.uActiveErrorCode = 0xdeadbeef;
768	pVM->trpm.s.uActiveCR2 = 0xdeadface;
769	return VINF_EM_RAW_GUEST_TRAP;
770	}
771
772
773	/**
774	* Raises a cpu exception with an errorcode.
775	*
776	* This function may or may not dispatch the exception before returning.
777	*
778	* @returns VBox status code fit for scheduling.
779	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
780	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
781	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
782	*
783	* @param pVM The VM handle.
784	* @param pCtxCore The CPU context core.
785	* @param enmXcpt The exception.
786	* @param uErr The error code.
787	*/
788	TRPMDECL(int) TRPMRaiseXcptErr(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
789	{
790	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr));
791	/** @todo dispatch the trap. */
792	pVM->trpm.s.uActiveVector = enmXcpt;
793	pVM->trpm.s.enmActiveType = TRPM_TRAP;
794	pVM->trpm.s.uActiveErrorCode = uErr;
795	pVM->trpm.s.uActiveCR2 = 0xdeadface;
796	return VINF_EM_RAW_GUEST_TRAP;
797	}
798
799
800	/**
801	* Raises a cpu exception with an errorcode and CR2.
802	*
803	* This function may or may not dispatch the exception before returning.
804	*
805	* @returns VBox status code fit for scheduling.
806	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
807	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
808	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
809	*
810	* @param pVM The VM handle.
811	* @param pCtxCore The CPU context core.
812	* @param enmXcpt The exception.
813	* @param uErr The error code.
814	* @param uCR2 The CR2 value.
815	*/
816	TRPMDECL(int) TRPMRaiseXcptErrCR2(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
817	{
818	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr, uCR2));
819	/** @todo dispatch the trap. */
820	pVM->trpm.s.uActiveVector = enmXcpt;
821	pVM->trpm.s.enmActiveType = TRPM_TRAP;
822	pVM->trpm.s.uActiveErrorCode = uErr;
823	pVM->trpm.s.uActiveCR2 = uCR2;
824	return VINF_EM_RAW_GUEST_TRAP;
825	}
826
827
828	/**
829	* Clear guest trap/interrupt gate handler
830	*
831	* @returns VBox status code.
832	* @param pVM The VM to operate on.
833	* @param iTrap Interrupt/trap number.
834	*/
835	TRPMDECL(int) trpmClearGuestTrapHandler(PVM pVM, unsigned iTrap)
836	{
837	/*
838	* Validate.
839	*/
840	if (iTrap >= ELEMENTS(pVM->trpm.s.aIdt))
841	{
842	AssertMsg(iTrap < TRPM_HANDLER_INT_BASE, ("Illegal gate number %d!\n", iTrap));
843	return VERR_INVALID_PARAMETER;
844	}
845
846	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
847	#ifdef IN_RING3
848	trpmR3ClearPassThroughHandler(pVM, iTrap);
849	#else
850	AssertFailed();
851	#endif
852
853	pVM->trpm.s.aGuestTrapHandler[iTrap] = TRPM_INVALID_HANDLER;
854	return VINF_SUCCESS;
855	}
856
857

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source: vbox/trunk/src/VBox/VMM/VMMAll/TRPMAll.cpp@ 8170

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