TRPMAll.cpp@ 51906

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1	/* $Id: TRPMAll.cpp 49623 2013-11-22 12:26:29Z vboxsync $ */
2	/** @file
3	* TRPM - Trap Monitor - Any Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 Oracle Corporation
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
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_TRPM
23	#include <VBox/vmm/trpm.h>
24	#include <VBox/vmm/pgm.h>
25	#include <VBox/vmm/mm.h>
26	#include <VBox/vmm/hm.h>
27	#include <VBox/vmm/patm.h>
28	#include <VBox/vmm/selm.h>
29	#include <VBox/vmm/stam.h>
30	#include <VBox/vmm/dbgf.h>
31	#include "TRPMInternal.h"
32	#include <VBox/vmm/vm.h>
33	#include <VBox/err.h>
34	#include <VBox/vmm/em.h>
35	#include <VBox/log.h>
36	#include <iprt/assert.h>
37	#include <iprt/asm.h>
38	#include <iprt/asm-amd64-x86.h>
39	#include <iprt/param.h>
40	#include <iprt/x86.h>
41	#include "internal/pgm.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 pVCpu Pointer to the VMCPU.
51	* @param pu8TrapNo Where to store the trap number.
52	* @param penmType Where to store the trap type
53	*/
54	VMMDECL(int) TRPMQueryTrap(PVMCPU pVCpu, uint8_t pu8TrapNo, TRPMEVENT penmType)
55	{
56	/*
57	* Check if we have a trap at present.
58	*/
59	if (pVCpu->trpm.s.uActiveVector != ~0U)
60	{
61	if (pu8TrapNo)
62	*pu8TrapNo = (uint8_t)pVCpu->trpm.s.uActiveVector;
63	if (penmType)
64	*penmType = pVCpu->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 pVCpu Pointer to the VMCPU.
80	*/
81	VMMDECL(uint8_t) TRPMGetTrapNo(PVMCPU pVCpu)
82	{
83	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
84	return (uint8_t)pVCpu->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 pVCpu Pointer to the VMCPU.
96	*/
97	VMMDECL(RTGCUINT) TRPMGetErrorCode(PVMCPU pVCpu)
98	{
99	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
100	#ifdef VBOX_STRICT
101	switch (pVCpu->trpm.s.uActiveVector)
102	{
103	case X86_XCPT_TS:
104	case X86_XCPT_NP:
105	case X86_XCPT_SS:
106	case X86_XCPT_GP:
107	case X86_XCPT_PF:
108	case X86_XCPT_AC:
109	case X86_XCPT_DF:
110	break;
111	default:
112	AssertMsgFailed(("This trap (%#x) doesn't have any error code\n", pVCpu->trpm.s.uActiveVector));
113	break;
114	}
115	#endif
116	return pVCpu->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 pVCpu Pointer to the VMCPU.
128	*/
129	VMMDECL(RTGCUINTPTR) TRPMGetFaultAddress(PVMCPU pVCpu)
130	{
131	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
132	AssertMsg(pVCpu->trpm.s.uActiveVector == X86_XCPT_PF, ("Not page-fault trap!\n"));
133	return pVCpu->trpm.s.uActiveCR2;
134	}
135
136
137	/**
138	* Gets the instruction-length for the current trap (only relevant for software
139	* interrupts and software exceptions #BP and #OF).
140	*
141	* The caller is responsible for making sure there is an active trap 0x0e when
142	* making this request.
143	*
144	* @returns Fault address associated with the trap.
145	* @param pVCpu Pointer to the VMCPU.
146	*/
147	VMMDECL(uint8_t) TRPMGetInstrLength(PVMCPU pVCpu)
148	{
149	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
150	return pVCpu->trpm.s.cbInstr;
151	}
152
153
154	/**
155	* Clears the current active trap/exception/interrupt.
156	*
157	* The caller is responsible for making sure there is an active trap
158	* when making this request.
159	*
160	* @returns VBox status code.
161	* @param pVCpu Pointer to the VMCPU.
162	*/
163	VMMDECL(int) TRPMResetTrap(PVMCPU pVCpu)
164	{
165	/*
166	* Cannot reset non-existing trap!
167	*/
168	if (pVCpu->trpm.s.uActiveVector == ~0U)
169	{
170	AssertMsgFailed(("No active trap!\n"));
171	return VERR_TRPM_NO_ACTIVE_TRAP;
172	}
173
174	/*
175	* Reset it.
176	*/
177	pVCpu->trpm.s.uActiveVector = ~0U;
178	return VINF_SUCCESS;
179	}
180
181
182	/**
183	* Assert trap/exception/interrupt.
184	*
185	* The caller is responsible for making sure there is no active trap
186	* when making this request.
187	*
188	* @returns VBox status code.
189	* @param pVCpu Pointer to the VMCPU.
190	* @param u8TrapNo The trap vector to assert.
191	* @param enmType Trap type.
192	*/
193	VMMDECL(int) TRPMAssertTrap(PVMCPU pVCpu, uint8_t u8TrapNo, TRPMEVENT enmType)
194	{
195	Log2(("TRPMAssertTrap: u8TrapNo=%02x type=%d\n", u8TrapNo, enmType));
196
197	/*
198	* Cannot assert a trap when one is already active.
199	*/
200	if (pVCpu->trpm.s.uActiveVector != ~0U)
201	{
202	AssertMsgFailed(("CPU%d: Active trap %#x\n", pVCpu->idCpu, pVCpu->trpm.s.uActiveVector));
203	return VERR_TRPM_ACTIVE_TRAP;
204	}
205
206	pVCpu->trpm.s.uActiveVector = u8TrapNo;
207	pVCpu->trpm.s.enmActiveType = enmType;
208	pVCpu->trpm.s.uActiveErrorCode = ~(RTGCUINT)0;
209	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
210	pVCpu->trpm.s.cbInstr = UINT8_MAX;
211	return VINF_SUCCESS;
212	}
213
214
215	/**
216	* Assert a page-fault exception.
217	*
218	* The caller is responsible for making sure there is no active trap
219	* when making this request.
220	*
221	* @returns VBox status code.
222	* @param pVCpu Pointer to the VMCPU.
223	* @param uCR2 The new fault address.
224	* @param uErrorCode The error code for the page-fault.
225	*/
226	VMMDECL(int) TRPMAssertXcptPF(PVMCPU pVCpu, RTGCUINTPTR uCR2, RTGCUINT uErrorCode)
227	{
228	Log2(("TRPMAssertXcptPF: uCR2=%RGv uErrorCode=%RGv\n", uCR2, uErrorCode)); /** @todo RTGCUINT to be fixed. */
229
230	/*
231	* Cannot assert a trap when one is already active.
232	*/
233	if (pVCpu->trpm.s.uActiveVector != ~0U)
234	{
235	AssertMsgFailed(("CPU%d: Active trap %#x\n", pVCpu->idCpu, pVCpu->trpm.s.uActiveVector));
236	return VERR_TRPM_ACTIVE_TRAP;
237	}
238
239	pVCpu->trpm.s.uActiveVector = X86_XCPT_PF;
240	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
241	pVCpu->trpm.s.uActiveErrorCode = uErrorCode;
242	pVCpu->trpm.s.uActiveCR2 = uCR2;
243	pVCpu->trpm.s.cbInstr = UINT8_MAX;
244	return VINF_SUCCESS;
245	}
246
247
248	/**
249	* Sets the error code of the current trap.
250	* (This function is for use in trap handlers and such.)
251	*
252	* The caller is responsible for making sure there is an active trap
253	* which takes an errorcode when making this request.
254	*
255	* @param pVCpu Pointer to the VMCPU.
256	* @param uErrorCode The new error code.
257	*/
258	VMMDECL(void) TRPMSetErrorCode(PVMCPU pVCpu, RTGCUINT uErrorCode)
259	{
260	Log2(("TRPMSetErrorCode: uErrorCode=%RGv\n", uErrorCode)); /** @todo RTGCUINT mess! */
261	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
262	pVCpu->trpm.s.uActiveErrorCode = uErrorCode;
263	#ifdef VBOX_STRICT
264	switch (pVCpu->trpm.s.uActiveVector)
265	{
266	case X86_XCPT_TS: case X86_XCPT_NP: case X86_XCPT_SS: case X86_XCPT_GP: case X86_XCPT_PF:
267	AssertMsg(uErrorCode != ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
268	break;
269	case X86_XCPT_AC: case X86_XCPT_DF:
270	AssertMsg(uErrorCode == 0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
271	break;
272	default:
273	AssertMsg(uErrorCode == ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
274	break;
275	}
276	#endif
277	}
278
279
280	/**
281	* Sets the fault address of the current #PF trap. (This function is for use in
282	* trap handlers and such.)
283	*
284	* The caller is responsible for making sure there is an active trap 0e
285	* when making this request.
286	*
287	* @param pVCpu Pointer to the VMCPU.
288	* @param uCR2 The new fault address (cr2 register).
289	*/
290	VMMDECL(void) TRPMSetFaultAddress(PVMCPU pVCpu, RTGCUINTPTR uCR2)
291	{
292	Log2(("TRPMSetFaultAddress: uCR2=%RGv\n", uCR2));
293	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
294	AssertMsg(pVCpu->trpm.s.uActiveVector == X86_XCPT_PF, ("Not trap 0e!\n"));
295	pVCpu->trpm.s.uActiveCR2 = uCR2;
296	}
297
298
299	/**
300	* Sets the instruction-length of the current trap (relevant for software
301	* interrupts and software exceptions like #BP, #OF).
302	*
303	* The caller is responsible for making sure there is an active trap 0e
304	* when making this request.
305	*
306	* @param pVCpu Pointer to the VMCPU.
307	* @param cbInstr The instruction length.
308	*/
309	VMMDECL(void) TRPMSetInstrLength(PVMCPU pVCpu, uint8_t cbInstr)
310	{
311	Log2(("TRPMSetInstrLength: cbInstr=%u\n", cbInstr));
312	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
313	AssertMsg( pVCpu->trpm.s.enmActiveType == TRPM_SOFTWARE_INT
314	\|\| ( pVCpu->trpm.s.enmActiveType == TRPM_TRAP
315	&& ( pVCpu->trpm.s.uActiveVector == X86_XCPT_BP
316	\|\| pVCpu->trpm.s.uActiveVector == X86_XCPT_OF)),
317	("Invalid trap type %#x\n", pVCpu->trpm.s.enmActiveType));
318	pVCpu->trpm.s.cbInstr = cbInstr;
319	}
320
321
322	/**
323	* Checks if the current active trap/interrupt/exception/fault/whatever is a software
324	* interrupt or not.
325	*
326	* The caller is responsible for making sure there is an active trap
327	* when making this request.
328	*
329	* @returns true if software interrupt, false if not.
330	*
331	* @param pVCpu Pointer to the VMCPU.
332	*/
333	VMMDECL(bool) TRPMIsSoftwareInterrupt(PVMCPU pVCpu)
334	{
335	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
336	return (pVCpu->trpm.s.enmActiveType == TRPM_SOFTWARE_INT);
337	}
338
339
340	/**
341	* Check if there is an active trap.
342	*
343	* @returns true if trap active, false if not.
344	* @param pVCpu Pointer to the VMCPU.
345	*/
346	VMMDECL(bool) TRPMHasTrap(PVMCPU pVCpu)
347	{
348	return pVCpu->trpm.s.uActiveVector != ~0U;
349	}
350
351
352	/**
353	* Query all info about the current active trap/interrupt.
354	* If no trap is active active an error code is returned.
355	*
356	* @returns VBox status code.
357	* @param pVCpu Pointer to the VMCPU.
358	* @param pu8TrapNo Where to store the trap number.
359	* @param pEnmType Where to store the trap type
360	* @param puErrorCode Where to store the error code associated with some traps.
361	* ~0U is stored if the trap has no error code.
362	* @param puCR2 Where to store the CR2 associated with a trap 0E.
363	* @param pcbInstr Where to store the instruction-length
364	* associated with some traps.
365	*/
366	VMMDECL(int) TRPMQueryTrapAll(PVMCPU pVCpu, uint8_t pu8TrapNo, TRPMEVENT pEnmType, PRTGCUINT puErrorCode, PRTGCUINTPTR puCR2,
367	uint8_t *pcbInstr)
368	{
369	/*
370	* Check if we have a trap at present.
371	*/
372	if (pVCpu->trpm.s.uActiveVector == ~0U)
373	return VERR_TRPM_NO_ACTIVE_TRAP;
374
375	if (pu8TrapNo)
376	*pu8TrapNo = (uint8_t)pVCpu->trpm.s.uActiveVector;
377	if (pEnmType)
378	*pEnmType = pVCpu->trpm.s.enmActiveType;
379	if (puErrorCode)
380	*puErrorCode = pVCpu->trpm.s.uActiveErrorCode;
381	if (puCR2)
382	*puCR2 = pVCpu->trpm.s.uActiveCR2;
383	if (pcbInstr)
384	*pcbInstr = pVCpu->trpm.s.cbInstr;
385	return VINF_SUCCESS;
386	}
387
388
389	/**
390	* Save the active trap.
391	*
392	* This routine useful when doing try/catch in the hypervisor.
393	* Any function which uses temporary trap handlers should
394	* probably also use this facility to save the original trap.
395	*
396	* @param pVM Pointer to the VM.
397	*/
398	VMMDECL(void) TRPMSaveTrap(PVMCPU pVCpu)
399	{
400	pVCpu->trpm.s.uSavedVector = pVCpu->trpm.s.uActiveVector;
401	pVCpu->trpm.s.enmSavedType = pVCpu->trpm.s.enmActiveType;
402	pVCpu->trpm.s.uSavedErrorCode = pVCpu->trpm.s.uActiveErrorCode;
403	pVCpu->trpm.s.uSavedCR2 = pVCpu->trpm.s.uActiveCR2;
404	pVCpu->trpm.s.cbSavedInstr = pVCpu->trpm.s.cbInstr;
405	}
406
407
408	/**
409	* Restore a saved trap.
410	*
411	* Multiple restores of a saved trap is possible.
412	*
413	* @param pVM Pointer to the VM.
414	*/
415	VMMDECL(void) TRPMRestoreTrap(PVMCPU pVCpu)
416	{
417	pVCpu->trpm.s.uActiveVector = pVCpu->trpm.s.uSavedVector;
418	pVCpu->trpm.s.enmActiveType = pVCpu->trpm.s.enmSavedType;
419	pVCpu->trpm.s.uActiveErrorCode = pVCpu->trpm.s.uSavedErrorCode;
420	pVCpu->trpm.s.uActiveCR2 = pVCpu->trpm.s.uSavedCR2;
421	pVCpu->trpm.s.cbInstr = pVCpu->trpm.s.cbSavedInstr;
422	}
423
424
425	#ifdef VBOX_WITH_RAW_MODE_NOT_R0
426	/**
427	* Forward trap or interrupt to the guest's handler
428	*
429	*
430	* @returns VBox status code.
431	* or does not return at all (when the trap is actually forwarded)
432	*
433	* @param pVM Pointer to the VM.
434	* @param pRegFrame Pointer to the register frame for the trap.
435	* @param iGate Trap or interrupt gate number
436	* @param cbInstr Instruction size (only relevant for software interrupts)
437	* @param enmError TRPM_TRAP_HAS_ERRORCODE or TRPM_TRAP_NO_ERRORCODE.
438	* @param enmType TRPM event type
439	* @param iOrgTrap The original trap.
440	* @internal
441	*/
442	VMMDECL(int) TRPMForwardTrap(PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, uint32_t iGate, uint32_t cbInstr,
443	TRPMERRORCODE enmError, TRPMEVENT enmType, int32_t iOrgTrap)
444	{
445	AssertReturn(!HMIsEnabled(pVCpu->CTX_SUFF(pVM)), VERR_TRPM_HM_IPE);
446	#ifdef TRPM_FORWARD_TRAPS_IN_GC
447	PVM pVM = pVCpu->CTX_SUFF(pVM);
448	X86EFLAGS eflags;
449	Assert(pVM->cCpus == 1);
450
451	STAM_PROFILE_ADV_START(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
452
453	# if defined(VBOX_STRICT) \|\| defined(LOG_ENABLED)
454	if (pRegFrame->eflags.Bits.u1VM)
455	Log(("TRPMForwardTrap-VM: eip=%04X:%04X iGate=%d\n", pRegFrame->cs.Sel, pRegFrame->eip, iGate));
456	else
457	Log(("TRPMForwardTrap: eip=%04X:%08X iGate=%d\n", pRegFrame->cs.Sel, pRegFrame->eip, iGate));
458
459	switch (iGate) {
460	case X86_XCPT_PF:
461	if (pRegFrame->eip == pVCpu->trpm.s.uActiveCR2)
462	{
463	RTGCPTR pCallerGC;
464	# ifdef IN_RC
465	int rc = MMGCRamRead(pVM, &pCallerGC, (void *)pRegFrame->esp, sizeof(pCallerGC));
466	# else
467	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
468	# endif
469	if (RT_SUCCESS(rc))
470	Log(("TRPMForwardTrap: caller=%RGv\n", pCallerGC));
471	}
472	/* no break */
473	case X86_XCPT_DF:
474	case X86_XCPT_TS:
475	case X86_XCPT_NP:
476	case X86_XCPT_SS:
477	case X86_XCPT_GP:
478	case X86_XCPT_AC:
479	Assert(enmError == TRPM_TRAP_HAS_ERRORCODE \|\| enmType == TRPM_SOFTWARE_INT);
480	break;
481
482	default:
483	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
484	break;
485	}
486	# endif /* VBOX_STRICT \|\| LOG_ENABLED */
487	#ifdef IN_RC
488	AssertReturn(CPUMIsGuestInRawMode(pVCpu), VINF_EM_RESCHEDULE);
489	#endif
490
491	/* Retrieve the eflags including the virtualized bits. */
492	/* Note: hackish as the cpumctxcore structure doesn't contain the right value */
493	eflags.u32 = CPUMRawGetEFlags(pVCpu);
494
495	/* VMCPU_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
496	Assert(enmType != TRPM_HARDWARE_INT \|\| !VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS));
497
498	/*
499	* 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.
500	* Well, only if the IF flag is set.
501	*/
502	/** @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. */
503	if ( pVM->trpm.s.aGuestTrapHandler[iGate]
504	&& (eflags.Bits.u1IF)
505	#ifndef VBOX_RAW_V86
506	&& !(eflags.Bits.u1VM) /** @todo implement when needed (illegal for same privilege level transfers). */
507	#endif
508	&& !PATMIsPatchGCAddr(pVM, pRegFrame->eip)
509	)
510	{
511	uint16_t cbIDT;
512	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVCpu, &cbIDT);
513	uint32_t cpl;
514	VBOXIDTE GuestIdte;
515	RTGCPTR pIDTEntry;
516	int rc;
517
518	Assert(PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame));
519	Assert(!VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_SELM_SYNC_GDT \| VMCPU_FF_SELM_SYNC_LDT \| VMCPU_FF_TRPM_SYNC_IDT \| VMCPU_FF_SELM_SYNC_TSS));
520
521	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
522	goto failure;
523
524	/* Get the current privilege level. */
525	cpl = CPUMGetGuestCPL(pVCpu);
526
527	/*
528	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
529	* All very obscure, but still necessary.
530	* Currently only some CS & TSS selector checks are missing.
531	*
532	*/
533	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
534	#ifdef IN_RC
535	rc = MMGCRamRead(pVM, &GuestIdte, (void *)(uintptr_t)pIDTEntry, sizeof(GuestIdte));
536	#else
537	rc = PGMPhysSimpleReadGCPtr(pVCpu, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
538	#endif
539	if (RT_FAILURE(rc))
540	{
541	/* The page might be out of sync. / /* @todo might cross a page boundary) */
542	Log(("Page %RGv out of sync -> prefetch and try again\n", pIDTEntry));
543	rc = PGMPrefetchPage(pVCpu, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
544	if (rc != VINF_SUCCESS)
545	{
546	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Rrc\n", rc));
547	goto failure;
548	}
549	#ifdef IN_RC
550	rc = MMGCRamRead(pVM, &GuestIdte, (void *)(uintptr_t)pIDTEntry, sizeof(GuestIdte));
551	#else
552	rc = PGMPhysSimpleReadGCPtr(pVCpu, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
553	#endif
554	}
555	if ( RT_SUCCESS(rc)
556	&& GuestIdte.Gen.u1Present
557	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
558	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
559	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
560	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
561	)
562	{
563	RTGCPTR pHandler, dummy;
564	RTGCPTR pTrapStackGC;
565
566	pHandler = (RTGCPTR)VBOXIDTE_OFFSET(GuestIdte);
567
568	/* Note: SELMValidateAndConvertCSAddr checks for code type, memory type, selector validity. */
569	/** @todo dpl <= cpl else GPF */
570
571	/* Note: don't use current eflags as we might be in V86 mode and the IDT always contains protected mode selectors */
572	X86EFLAGS fakeflags;
573	fakeflags.u32 = 0;
574
575	rc = SELMValidateAndConvertCSAddr(pVCpu, fakeflags, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
576	if (rc == VINF_SUCCESS)
577	{
578	VBOXGDTR gdtr = {0, 0};
579	bool fConforming = false;
580	int idx = 0;
581	uint32_t dpl;
582	uint32_t ss_r0;
583	uint32_t esp_r0;
584	X86DESC Desc;
585	RTGCPTR pGdtEntry;
586
587	CPUMGetGuestGDTR(pVCpu, &gdtr);
588	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
589
590	if (!gdtr.pGdt)
591	goto failure;
592
593	pGdtEntry = gdtr.pGdt + (GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT) * sizeof(X86DESC);
594	#ifdef IN_RC
595	rc = MMGCRamRead(pVM, &Desc, (void *)(uintptr_t)pGdtEntry, sizeof(Desc));
596	#else
597	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, pGdtEntry, sizeof(Desc));
598	#endif
599	if (RT_FAILURE(rc))
600	{
601	/* The page might be out of sync. / /* @todo might cross a page boundary) */
602	Log(("Page %RGv out of sync -> prefetch and try again\n", pGdtEntry));
603	rc = PGMPrefetchPage(pVCpu, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
604	if (rc != VINF_SUCCESS)
605	{
606	Log(("PGMPrefetchPage failed with rc=%Rrc\n", rc));
607	goto failure;
608	}
609	#ifdef IN_RC
610	rc = MMGCRamRead(pVM, &Desc, (void *)(uintptr_t)pGdtEntry, sizeof(Desc));
611	#else
612	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, pGdtEntry, sizeof(Desc));
613	#endif
614	if (RT_FAILURE(rc))
615	{
616	Log(("MMGCRamRead failed with %Rrc\n", rc));
617	goto failure;
618	}
619	}
620
621	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
622	{
623	Log(("Conforming code selector\n"));
624	fConforming = true;
625	}
626	/** @todo check descriptor type!! */
627
628	dpl = Desc.Gen.u2Dpl;
629
630	if (!fConforming && dpl < cpl) /* to inner privilege level */
631	{
632	rc = SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
633	if (RT_FAILURE(rc))
634	goto failure;
635
636	Assert((ss_r0 & X86_SEL_RPL) == 1);
637
638	if ( !esp_r0
639	\|\| !ss_r0
640	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
641	\|\| SELMToFlatBySelEx(pVCpu, fakeflags, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1,
642	(PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
643	)
644	{
645	Log(("Invalid ring 0 stack %04X:%08RX32\n", ss_r0, esp_r0));
646	goto failure;
647	}
648	}
649	else
650	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
651	{
652	ss_r0 = pRegFrame->ss.Sel;
653	esp_r0 = pRegFrame->esp;
654
655	if ( eflags.Bits.u1VM /* illegal */
656	\|\| SELMToFlatBySelEx(pVCpu, fakeflags, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1,
657	(PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
658	{
659	AssertMsgFailed(("Invalid stack %04X:%08RX32??? (VM=%d)\n", ss_r0, esp_r0, eflags.Bits.u1VM));
660	goto failure;
661	}
662	}
663	else
664	{
665	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
666	goto failure;
667	}
668	/*
669	* Build trap stack frame on guest handler's stack
670	*/
671	uint32_t *pTrapStack;
672	#ifdef IN_RC
673	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss.Sel & X86_SEL_RPL) != 0);
674	/* Check maximum amount we need (10 when executing in V86 mode) */
675	rc = PGMVerifyAccess(pVCpu, (RTGCUINTPTR)pTrapStackGC - 10sizeof(uint32_t), 10 sizeof(uint32_t), X86_PTE_RW);
676	pTrapStack = (uint32_t *)(uintptr_t)pTrapStackGC;
677	#else
678	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss.Sel & X86_SEL_RPL) == 0 \|\| (pRegFrame->ss.Sel & X86_SEL_RPL) == 3 \|\| (EMIsRawRing1Enabled(pVM) && (pRegFrame->ss.Sel & X86_SEL_RPL) == 1));
679	/* Check maximum amount we need (10 when executing in V86 mode) */
680	if ((pTrapStackGC >> PAGE_SHIFT) != ((pTrapStackGC - 10sizeof(uint32_t)) >> PAGE_SHIFT)) / fail if we cross a page boundary */
681	goto failure;
682	PGMPAGEMAPLOCK PageMappingLock;
683	rc = PGMPhysGCPtr2CCPtr(pVCpu, pTrapStackGC, (void **)&pTrapStack, &PageMappingLock);
684	if (RT_FAILURE(rc))
685	{
686	AssertRC(rc);
687	goto failure;
688	}
689	#endif
690	if (rc == VINF_SUCCESS)
691	{
692	/** if eflags.Bits.u1VM then push gs, fs, ds, es */
693	if (eflags.Bits.u1VM)
694	{
695	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.Sel & X86_SEL_RPL), pVCpu->trpm.s.uActiveCR2));
696	pTrapStack[--idx] = pRegFrame->gs.Sel;
697	pTrapStack[--idx] = pRegFrame->fs.Sel;
698	pTrapStack[--idx] = pRegFrame->ds.Sel;
699	pTrapStack[--idx] = pRegFrame->es.Sel;
700
701	/* clear ds, es, fs & gs in current context */
702	pRegFrame->ds.Sel = pRegFrame->es.Sel = pRegFrame->fs.Sel = pRegFrame->gs.Sel = 0;
703	}
704	else
705	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.Sel & X86_SEL_RPL), pVCpu->trpm.s.uActiveCR2));
706
707	if (!fConforming && dpl < cpl)
708	{
709	#ifdef IN_RC /* Only in RC we still see tracing of our ring modifications. */
710	if ( (pRegFrame->ss.Sel & X86_SEL_RPL) == 1
711	&& !eflags.Bits.u1VM)
712	pTrapStack[--idx] = pRegFrame->ss.Sel & ~1; /* Mask away traces of raw ring 0 execution (ring 1). */
713	else if ( EMIsRawRing1Enabled(pVM)
714	&& (pRegFrame->ss.Sel & X86_SEL_RPL) == 2)
715	pTrapStack[--idx] = (pRegFrame->ss.Sel & ~2) \| 1; /* Mask away traces of raw ring 1 execution (ring 2). */
716	else
717	#endif /* IN_RC */
718	pTrapStack[--idx] = pRegFrame->ss.Sel;
719
720	pTrapStack[--idx] = pRegFrame->esp;
721	}
722
723	/* Note: We use the eflags copy, that includes the virtualized bits! */
724	/* Note: Not really necessary as we grab include those bits in the trap/irq handler trampoline */
725	pTrapStack[--idx] = eflags.u32;
726
727	#ifdef IN_RC /* Only in RC mode we still see tracing of our ring modifications */
728	if ( (pRegFrame->cs.Sel & X86_SEL_RPL) == 1
729	&& !eflags.Bits.u1VM)
730	pTrapStack[--idx] = pRegFrame->cs.Sel & ~1; /* Mask away traces of raw ring execution (ring 1). */
731	else if ( EMIsRawRing1Enabled(pVM)
732	&& (pRegFrame->cs.Sel & X86_SEL_RPL) == 2)
733	pTrapStack[--idx] = (pRegFrame->cs.Sel & ~2) \| 1; /* Mask away traces of raw ring 1 execution (ring 2). */
734	else
735	#endif /* IN_RC */
736	pTrapStack[--idx] = pRegFrame->cs.Sel;
737
738	if (enmType == TRPM_SOFTWARE_INT)
739	{
740	Assert(cbInstr);
741	pTrapStack[--idx] = pRegFrame->eip + cbInstr; /* return address = next instruction */
742	}
743	else
744	pTrapStack[--idx] = pRegFrame->eip;
745
746	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
747	{
748	pTrapStack[--idx] = pVCpu->trpm.s.uActiveErrorCode;
749	}
750
751	Assert(esp_r0 > -idx*sizeof(uint32_t));
752	/* Adjust ESP accordingly */
753	esp_r0 += idx*sizeof(uint32_t);
754
755	/* Mask away dangerous flags for the trap/interrupt handler. */
756	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
757	#ifdef DEBUG
758	if (DBGFIsStepping(pVCpu))
759	eflags.u32 \|= X86_EFL_TF;
760	#endif
761
762	/* Turn off interrupts for interrupt gates. */
763	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
764	eflags.Bits.u1IF = 0;
765
766	CPUMRawSetEFlags(pVCpu, eflags.u32);
767
768	#ifdef DEBUG
769	for (int j = idx; j < 0; j++)
770	LogFlow(("Stack %RRv pos %02d: %08x\n", &pTrapStack[j], j, pTrapStack[j]));
771
772	Log4(("eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
773	"eip=%08x esp=%08x ebp=%08x iopl=%d\n"
774	"cs=%04x ds=%04x es=%04x fs=%04x gs=%04x eflags=%08x\n",
775	pRegFrame->eax, pRegFrame->ebx, pRegFrame->ecx, pRegFrame->edx, pRegFrame->esi, pRegFrame->edi,
776	pRegFrame->eip, pRegFrame->esp, pRegFrame->ebp, eflags.Bits.u2IOPL,
777	pRegFrame->cs.Sel, pRegFrame->ds.Sel, pRegFrame->es.Sel,
778	pRegFrame->fs.Sel, pRegFrame->gs.Sel, eflags.u32));
779	#endif
780
781	Log(("TRPM: PATM Handler %RRv Adjusted stack %08X new EFLAGS=%08X/%08x idx=%d dpl=%d cpl=%d\n",
782	pVM->trpm.s.aGuestTrapHandler[iGate], esp_r0, eflags.u32, CPUMRawGetEFlags(pVCpu), idx, dpl, cpl));
783
784	/* Make sure the internal guest context structure is up-to-date. */
785	if (iGate == X86_XCPT_PF)
786	CPUMSetGuestCR2(pVCpu, pVCpu->trpm.s.uActiveCR2);
787
788	#ifdef IN_RC
789	/* paranoia */
790	Assert(pRegFrame->eflags.Bits.u1IF == 1);
791	eflags.Bits.u1IF = 1;
792	Assert(pRegFrame->eflags.Bits.u2IOPL == 0);
793	eflags.Bits.u2IOPL = 0;
794
795	Assert(eflags.Bits.u1IF);
796	Assert(eflags.Bits.u2IOPL == 0);
797	STAM_COUNTER_INC(&pVM->trpm.s.CTX_SUFF(paStatForwardedIRQ)[iGate]);
798	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
799	if (iOrgTrap >= 0 && iOrgTrap < (int)RT_ELEMENTS(pVM->trpm.s.aStatGCTraps))
800	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[iOrgTrap], o);
801
802	PGMRZDynMapReleaseAutoSet(pVCpu);
803	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate],
804	eflags.u32, ss_r0, (RTRCPTR)esp_r0);
805	/* does not return */
806	#else
807
808	Assert(!CPUMIsGuestInRawMode(pVCpu));
809	pRegFrame->eflags.u32 = eflags.u32;
810	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
811	pRegFrame->cs.Sel = GuestIdte.Gen.u16SegSel;
812	pRegFrame->esp = esp_r0;
813	pRegFrame->ss.Sel = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
814	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
815	PGMPhysReleasePageMappingLock(pVM, &PageMappingLock);
816	NOREF(iOrgTrap);
817	return VINF_SUCCESS;
818	#endif
819	}
820	else
821	Log(("TRAP%02X: PGMVerifyAccess %RGv failed with %Rrc -> forward to REM\n", iGate, pTrapStackGC, rc));
822	}
823	else
824	Log(("SELMValidateAndConvertCSAddr failed with %Rrc\n", rc));
825	}
826	else
827	Log(("MMRamRead %RGv size %d failed with %Rrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
828	}
829	else
830	{
831	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
832	#ifdef VBOX_WITH_STATISTICS
833	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
834	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
835	else if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
836	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
837	#endif
838	}
839	failure:
840	STAM_COUNTER_INC(&pVM->trpm.s.CTX_SUFF_Z(StatForwardFail));
841	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
842
843	Log(("TRAP%02X: forwarding to REM (ss rpl=%d eflags=%08X VMIF=%d handler=%08X\n", iGate, pRegFrame->ss.Sel & X86_SEL_RPL, pRegFrame->eflags.u32, PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame), pVM->trpm.s.aGuestTrapHandler[iGate]));
844	#endif
845	return VINF_EM_RAW_GUEST_TRAP;
846	}
847	#endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
848
849
850	/**
851	* Raises a cpu exception which doesn't take an error code.
852	*
853	* This function may or may not dispatch the exception before returning.
854	*
855	* @returns VBox status code fit for scheduling.
856	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
857	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
858	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
859	*
860	* @param pVM Pointer to the VM.
861	* @param pCtxCore The CPU context core.
862	* @param enmXcpt The exception.
863	*/
864	VMMDECL(int) TRPMRaiseXcpt(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
865	{
866	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs.Sel, pCtxCore->eip, enmXcpt));
867	NOREF(pCtxCore);
868	/** @todo dispatch the trap. */
869	pVCpu->trpm.s.uActiveVector = enmXcpt;
870	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
871	pVCpu->trpm.s.uActiveErrorCode = 0xdeadbeef;
872	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
873	pVCpu->trpm.s.cbInstr = UINT8_MAX;
874	return VINF_EM_RAW_GUEST_TRAP;
875	}
876
877
878	/**
879	* Raises a cpu exception with an errorcode.
880	*
881	* This function may or may not dispatch the exception before returning.
882	*
883	* @returns VBox status code fit for scheduling.
884	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
885	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
886	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
887	*
888	* @param pVM Pointer to the VM.
889	* @param pCtxCore The CPU context core.
890	* @param enmXcpt The exception.
891	* @param uErr The error code.
892	*/
893	VMMDECL(int) TRPMRaiseXcptErr(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
894	{
895	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs.Sel, pCtxCore->eip, enmXcpt, uErr));
896	NOREF(pCtxCore);
897	/** @todo dispatch the trap. */
898	pVCpu->trpm.s.uActiveVector = enmXcpt;
899	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
900	pVCpu->trpm.s.uActiveErrorCode = uErr;
901	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
902	pVCpu->trpm.s.cbInstr = UINT8_MAX;
903	return VINF_EM_RAW_GUEST_TRAP;
904	}
905
906
907	/**
908	* Raises a cpu exception with an errorcode and CR2.
909	*
910	* This function may or may not dispatch the exception before returning.
911	*
912	* @returns VBox status code fit for scheduling.
913	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
914	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
915	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
916	*
917	* @param pVM Pointer to the VM.
918	* @param pCtxCore The CPU context core.
919	* @param enmXcpt The exception.
920	* @param uErr The error code.
921	* @param uCR2 The CR2 value.
922	*/
923	VMMDECL(int) TRPMRaiseXcptErrCR2(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
924	{
925	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs.Sel, pCtxCore->eip, enmXcpt, uErr, uCR2));
926	NOREF(pCtxCore);
927	/** @todo dispatch the trap. */
928	pVCpu->trpm.s.uActiveVector = enmXcpt;
929	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
930	pVCpu->trpm.s.uActiveErrorCode = uErr;
931	pVCpu->trpm.s.uActiveCR2 = uCR2;
932	pVCpu->trpm.s.cbInstr = UINT8_MAX;
933	return VINF_EM_RAW_GUEST_TRAP;
934	}
935
936
937	#ifdef VBOX_WITH_RAW_MODE
938	/**
939	* Clear guest trap/interrupt gate handler
940	*
941	* @returns VBox status code.
942	* @param pVM Pointer to the VM.
943	* @param iTrap Interrupt/trap number.
944	*/
945	VMMDECL(int) trpmClearGuestTrapHandler(PVM pVM, unsigned iTrap)
946	{
947	AssertReturn(!HMIsEnabled(pVM), VERR_TRPM_HM_IPE);
948	AssertMsgReturn(iTrap < RT_ELEMENTS(pVM->trpm.s.aIdt), ("Illegal gate number %d!\n", iTrap), VERR_INVALID_PARAMETER);
949
950	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
951	# ifdef IN_RING3
952	trpmR3ClearPassThroughHandler(pVM, iTrap);
953	# else
954	AssertFailed();
955	# endif
956
957	pVM->trpm.s.aGuestTrapHandler[iTrap] = TRPM_INVALID_HANDLER;
958	return VINF_SUCCESS;
959	}
960	#endif /* VBOX_WITH_RAW_MODE */
961

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source: vbox/trunk/src/VBox/VMM/VMMAll/TRPMAll.cpp@ 51906

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