TRPMAll.cpp@ 1

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1	/** @file
2	*
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
37	#include <VBox/log.h>
38	#include <iprt/assert.h>
39	#include <iprt/asm.h>
40	#include <iprt/param.h>
41
42
43
44	/**
45	* Query info about the current active trap/interrupt.
46	* If no trap is active active an error code is returned.
47	*
48	* @returns VBox status code.
49	* @param pVM The virtual machine.
50	* @param pu8TrapNo Where to store the trap number.
51	* @param pfSoftwareInterrupt Where to store the software interrupt indicator.
52	*/
53	TRPMDECL(int) TRPMQueryTrap(PVM pVM, uint8_t pu8TrapNo, bool pfSoftwareInterrupt)
54	{
55	/*
56	* Check if we have a trap at present.
57	*/
58	if (pVM->trpm.s.uActiveVector != ~0U)
59	{
60	if (pu8TrapNo)
61	*pu8TrapNo = (uint8_t)pVM->trpm.s.uActiveVector;
62	if (pfSoftwareInterrupt)
63	*pfSoftwareInterrupt = !!pVM->trpm.s.fActiveSoftwareInterrupt;
64	return VINF_SUCCESS;
65	}
66
67	return VERR_TRPM_NO_ACTIVE_TRAP;
68	}
69
70
71	/**
72	* Gets the trap number for the current trap.
73	*
74	* The caller is responsible for making sure there is an active trap which
75	* takes an error code when making this request.
76	*
77	* @returns The current trap number.
78	* @param pVM VM handle.
79	*/
80	TRPMDECL(uint8_t) TRPMGetTrapNo(PVM pVM)
81	{
82	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
83	return (uint8_t)pVM->trpm.s.uActiveVector;
84	}
85
86
87	/**
88	* Gets the error code for the current trap.
89	*
90	* The caller is responsible for making sure there is an active trap which
91	* takes an error code when making this request.
92	*
93	* @returns Error code.
94	* @param pVM VM handle.
95	*/
96	TRPMDECL(RTGCUINT) TRPMGetErrorCode(PVM pVM)
97	{
98	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
99	#ifdef VBOX_STRICT
100	switch (pVM->trpm.s.uActiveVector)
101	{
102	case 0x0a:
103	case 0x0b:
104	case 0x0c:
105	case 0x0d:
106	case 0x0e:
107	case 0x11:
108	case 0x08:
109	break;
110	default:
111	AssertMsgFailed(("This trap (%#x) doesn't have any error code\n", pVM->trpm.s.uActiveVector));
112	break;
113	}
114	#endif
115	return pVM->trpm.s.uActiveErrorCode;
116	}
117
118
119	/**
120	* Gets the fault address for the current trap.
121	*
122	* The caller is responsible for making sure there is an active trap 0x0e when
123	* making this request.
124	*
125	* @returns Fault address associated with the trap.
126	* @param pVM VM handle.
127	*/
128	TRPMDECL(RTGCUINTPTR) TRPMGetFaultAddress(PVM pVM)
129	{
130	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
131	AssertMsg(pVM->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
132	return pVM->trpm.s.uActiveCR2;
133	}
134
135
136	/**
137	* Clears the current active trap/exception/interrupt.
138	*
139	* The caller is responsible for making sure there is an active trap
140	* when making this request.
141	*
142	* @returns VBox status code.
143	* @param pVM The virtual machine handle.
144	*/
145	TRPMDECL(int) TRPMResetTrap(PVM pVM)
146	{
147	/*
148	* Cannot reset non-existing trap!
149	*/
150	if (pVM->trpm.s.uActiveVector == ~0U)
151	{
152	AssertMsgFailed(("No active trap!\n"));
153	return VERR_TRPM_NO_ACTIVE_TRAP;
154	}
155
156	/*
157	* Reset it.
158	*/
159	pVM->trpm.s.uActiveVector = ~0U;
160	return VINF_SUCCESS;
161	}
162
163
164	/**
165	* Assert trap/exception/interrupt.
166	*
167	* The caller is responsible for making sure there is no active trap
168	* when making this request.
169	*
170	* @returns VBox status code.
171	* @param pVM The virtual machine.
172	* @param u8TrapNo The trap vector to assert.
173	* @param fSoftwareInterrupt Indicate if it's a software interrupt or not.
174	*/
175	TRPMDECL(int) TRPMAssertTrap(PVM pVM, uint8_t u8TrapNo, bool fSoftwareInterrupt)
176	{
177	Log2(("TRPMAssertTrap: u8TrapNo=%02x fSoftwareInterrupt=%d\n", u8TrapNo, fSoftwareInterrupt));
178
179	/*
180	* Cannot assert a trap when one is already active.
181	*/
182	if (pVM->trpm.s.uActiveVector != ~0U)
183	{
184	AssertMsgFailed(("Active trap %#x\n", pVM->trpm.s.uActiveVector));
185	return VERR_TRPM_ACTIVE_TRAP;
186	}
187
188	pVM->trpm.s.uActiveVector = u8TrapNo;
189	pVM->trpm.s.fActiveSoftwareInterrupt = fSoftwareInterrupt;
190	pVM->trpm.s.uActiveErrorCode = ~0;
191	pVM->trpm.s.uActiveCR2 = 0xdeadface;
192	return VINF_SUCCESS;
193	}
194
195
196	/**
197	* Sets the error code of the current trap.
198	* (This function is for use in trap handlers and such.)
199	*
200	* The caller is responsible for making sure there is an active trap
201	* which takes an errorcode when making this request.
202	*
203	* @param pVM The virtual machine.
204	* @param uErrorCode The new error code.
205	*/
206	TRPMDECL(void) TRPMSetErrorCode(PVM pVM, RTGCUINT uErrorCode)
207	{
208	Log2(("TRPMSetErrorCode: uErrorCode=%VGv\n", uErrorCode));
209	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
210	pVM->trpm.s.uActiveErrorCode = uErrorCode;
211	#ifdef VBOX_STRICT
212	switch (pVM->trpm.s.uActiveVector)
213	{
214	case 0x0a: case 0x0b: case 0x0c: case 0x0d: case 0x0e:
215	AssertMsg(uErrorCode != ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
216	break;
217	case 0x11: case 0x08:
218	AssertMsg(uErrorCode == 0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
219	break;
220	default:
221	AssertMsg(uErrorCode == ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
222	break;
223	}
224	#endif
225	}
226
227
228	/**
229	* Sets the error code of the current trap.
230	* (This function is for use in trap handlers and such.)
231	*
232	* The caller is responsible for making sure there is an active trap 0e
233	* when making this request.
234	*
235	* @param pVM The virtual machine.
236	* @param uCR2 The new fault address (cr2 register).
237	*/
238	TRPMDECL(void) TRPMSetFaultAddress(PVM pVM, RTGCUINTPTR uCR2)
239	{
240	Log2(("TRPMSetFaultAddress: uCR2=%VGv\n", uCR2));
241	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
242	AssertMsg(pVM->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
243	pVM->trpm.s.uActiveCR2 = uCR2;
244	}
245
246
247	/**
248	* Checks if the current active trap/interrupt/exception/fault/whatever is a software
249	* interrupt or not.
250	*
251	* The caller is responsible for making sure there is an active trap
252	* when making this request.
253	*
254	* @returns true if software interrupt, false if not.
255	*
256	* @param pVM VM handle.
257	*/
258	TRPMDECL(bool) TRPMIsSoftwareInterrupt(PVM pVM)
259	{
260	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
261	return !!pVM->trpm.s.fActiveSoftwareInterrupt;
262	}
263
264
265	/**
266	* Check if there is an active trap.
267	*
268	* @returns true if trap active, false if not.
269	* @param pVM The virtual machine.
270	*/
271	TRPMDECL(bool) TRPMHasTrap(PVM pVM)
272	{
273	return pVM->trpm.s.uActiveVector != ~0U;
274	}
275
276
277	/**
278	* Query all info about the current active trap/interrupt.
279	* If no trap is active active an error code is returned.
280	*
281	* @returns VBox status code.
282	* @param pVM The virtual machine.
283	* @param pu8TrapNo Where to store the trap number.
284	* @param pfSoftwareInterrupt Where to store the software interrupt indicator.
285	* @param puErrorCode Where to store the error code associated with some traps.
286	* ~0U is stored if the trap have no error code.
287	* @param puCR2 Where to store the CR2 associated with a trap 0E.
288	*/
289	TRPMDECL(int) TRPMQueryTrapAll(PVM pVM, uint8_t pu8TrapNo, bool pfSoftwareInterrupt, PRTGCUINT puErrorCode, PRTGCUINTPTR puCR2)
290	{
291	/*
292	* Check if we have a trap at present.
293	*/
294	if (pVM->trpm.s.uActiveVector == ~0U)
295	return VERR_TRPM_NO_ACTIVE_TRAP;
296
297	if (pu8TrapNo)
298	*pu8TrapNo = (uint8_t)pVM->trpm.s.uActiveVector;
299	if (pfSoftwareInterrupt)
300	*pfSoftwareInterrupt = !!pVM->trpm.s.fActiveSoftwareInterrupt;
301	if (puErrorCode)
302	*puErrorCode = pVM->trpm.s.uActiveErrorCode;
303	if (puCR2)
304	*puCR2 = pVM->trpm.s.uActiveCR2;
305
306	return VINF_SUCCESS;
307	}
308
309
310	/**
311	* Save the active trap.
312	*
313	* This routine useful when doing try/catch in the hypervisor.
314	* Any function which uses temporary trap handlers should
315	* probably also use this facility to save the original trap.
316	*
317	* @param pVM VM handle.
318	*/
319	TRPMDECL(void) TRPMSaveTrap(PVM pVM)
320	{
321	pVM->trpm.s.uSavedVector = pVM->trpm.s.uActiveVector;
322	pVM->trpm.s.fSavedSoftwareInterrupt = pVM->trpm.s.fActiveSoftwareInterrupt;
323	pVM->trpm.s.uSavedErrorCode = pVM->trpm.s.uActiveErrorCode;
324	pVM->trpm.s.uSavedCR2 = pVM->trpm.s.uActiveCR2;
325	}
326
327
328	/**
329	* Restore a saved trap.
330	*
331	* Multiple restores of a saved trap is possible.
332	*
333	* @param pVM VM handle.
334	*/
335	TRPMDECL(void) TRPMRestoreTrap(PVM pVM)
336	{
337	pVM->trpm.s.uActiveVector = pVM->trpm.s.uSavedVector;
338	pVM->trpm.s.fActiveSoftwareInterrupt = pVM->trpm.s.fSavedSoftwareInterrupt;
339	pVM->trpm.s.uActiveErrorCode = pVM->trpm.s.uSavedErrorCode;
340	pVM->trpm.s.uActiveCR2 = pVM->trpm.s.uSavedCR2;
341	}
342
343
344	/**
345	* Forward trap or interrupt to the guest's handler
346	*
347	*
348	* @returns VBox status code.
349	* or does not return at all (when the trap is actually forwarded)
350	*
351	* @param pVM The VM to operate on.
352	* @param pRegFrame Pointer to the register frame for the trap.
353	* @param iGate Trap or interrupt gate number
354	* @param opsize Instruction size (only relevant for software interrupts)
355	* @param enmError TRPM_TRAP_HAS_ERRORCODE or TRPM_TRAP_NO_ERRORCODE.
356	* @param enmType TRPM event type
357	* @internal
358	*/
359	TRPMDECL(int) TRPMForwardTrap(PVM pVM, PCPUMCTXCORE pRegFrame, uint32_t iGate, uint32_t opsize, TRPMERRORCODE enmError, TRPMEVENT enmType)
360	{
361	X86EFLAGS eflags;
362
363	#ifdef TRPM_FORWARD_TRAPS_IN_GC
364	Log(("TRPMForwardTrap: eip=%VGv iGate=%d\n", pRegFrame->eip, iGate));
365
366	#ifdef DEBUG
367	switch (iGate) {
368	case 14:
369	if (pRegFrame->eip == pVM->trpm.s.uActiveCR2)
370	{
371	int rc;
372	RTGCPTR pCallerGC;
373	#ifdef IN_GC
374	rc = MMGCRamRead(pVM, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
375	#else
376	rc = PGMPhysReadGCPtr(pVM, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
377	#endif
378	if (VBOX_SUCCESS(rc))
379	{
380	Log(("TRPMForwardTrap: caller=%VGv\n", pCallerGC));
381	}
382	}
383	/* no break */
384	case 8:
385	case 10:
386	case 11:
387	case 12:
388	case 13:
389	case 17:
390	Assert(enmError == TRPM_TRAP_HAS_ERRORCODE);
391	break;
392	default:
393	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
394	break;
395	}
396	#endif /* DEBUG */
397
398	/* Retrieve the eflags including the virtualized bits. */
399	/** @note hackish as the cpumctxcore structure doesn't contain the right value */
400	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
401
402	/* VM_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
403	Assert(enmType != TRPM_HARDWARE_INT \|\| !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS));
404
405	/*
406	* 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.
407	* Well, only if the IF flag is set.
408	*/
409	/*
410	* @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.
411	*
412	*/
413	if ( pVM->trpm.s.aGuestTrapHandler[iGate]
414	&& (eflags.Bits.u1IF)
415	&& !(eflags.Bits.u1VM) /* @todo implement when needed (illegal for same privilege level transfers). */
416	&& !PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)
417	)
418	{
419	uint16_t cbIDT;
420	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVM, &cbIDT);
421	uint32_t cpl;
422	VBOXIDTE GuestIdte;
423	RTGCPTR pIDTEntry;
424	int rc;
425
426	Assert(PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame));
427
428	/* Must get the CPL from the SS selector (CS might be conforming) */
429	if ((pRegFrame->ss & X86_SEL_RPL) == 1)
430	cpl = 0;
431	else
432	cpl = (pRegFrame->ss & X86_SEL_RPL);
433
434	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
435	goto failure;
436
437	/*
438	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
439	* All very obscure, but still necessary.
440	* Currently only some CS & TSS selector checks are missing.
441	*
442	*/
443	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
444	#ifdef IN_GC
445	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
446	#else
447	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
448	#endif
449	if (VBOX_FAILURE(rc))
450	{
451	/* The page might be out of sync. (@todo might cross a page boundary) */
452	Log(("Page %VGv out of sync -> prefetch and try again\n", pIDTEntry));
453	rc = PGMPrefetchPage(pVM, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
454	if (rc != VINF_SUCCESS)
455	{
456	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Vrc\n", rc));
457	goto failure;
458	}
459	#ifdef IN_GC
460	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
461	#else
462	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
463	#endif
464	}
465	if ( VBOX_SUCCESS(rc)
466	&& GuestIdte.Gen.u1Present
467	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
468	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
469	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
470	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
471	)
472	{
473	RTGCPTR pHandler, dummy;
474	GCPTRTYPE(uint32_t *)pTrapStackGC;
475	#ifndef IN_GC
476	HCPTRTYPE(uint32_t *)pTrapStackHC;
477	#endif
478
479	pHandler = (RTGCPTR)((GuestIdte.Gen.u16OffsetHigh << 16) \| GuestIdte.Gen.u16OffsetLow);
480
481	/* Note: SELMValidateAndConvertCSAddr checks for code type, memory type, selector validity. */
482	/** @todo dpl <= cpl else GPF */
483	rc = SELMValidateAndConvertCSAddr(pVM, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
484	if (rc == VINF_SUCCESS)
485	{
486	VBOXGDTR gdtr = {0};
487	bool fConforming = false;
488	int idx = 0;
489	uint32_t dpl;
490	uint32_t ss_r0;
491	uint32_t esp_r0;
492	VBOXDESC Desc;
493	RTGCPTR pGdtEntry;
494
495	CPUMGetGuestGDTR(pVM, &gdtr);
496	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
497
498	if (!gdtr.pGdt)
499	goto failure;
500
501	pGdtEntry = (RTGCPTR)&((VBOXDESC *)gdtr.pGdt)[GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT];
502	#ifdef IN_GC
503	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
504	#else
505	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
506	#endif
507	if (VBOX_FAILURE(rc))
508	{
509	/* The page might be out of sync. (@todo might cross a page boundary) */
510	Log(("Page %VGv out of sync -> prefetch and try again\n", pGdtEntry));
511	rc = PGMPrefetchPage(pVM, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
512	if (rc != VINF_SUCCESS)
513	{
514	Log(("PGMPrefetchPage failed with rc=%Vrc\n", rc));
515	return rc;
516	}
517	#ifdef IN_GC
518	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
519	#else
520	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
521	#endif
522	if (VBOX_FAILURE(rc))
523	{
524	Log(("MMGCRamRead failed with %Vrc\n", rc));
525	goto failure;
526	}
527	}
528
529	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
530	{
531	Log(("Conforming code selector\n"));
532	fConforming = true;
533	}
534	/** @todo check descriptor type!! */
535
536	dpl = Desc.Gen.u2Dpl;
537
538	if (!fConforming && dpl < cpl) /* to inner privilege level */
539	{
540	SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
541	Assert((ss_r0 & X86_SEL_RPL) == 1);
542
543	if ( !esp_r0
544	\|\| !ss_r0
545	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
546	\|\| SELMToFlatEx(pVM, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
547	)
548	{
549	Log(("Invalid ring 0 stack %04X:%VGv\n", ss_r0, esp_r0));
550	goto failure;
551	}
552	}
553	else
554	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
555	{
556	ss_r0 = pRegFrame->ss;
557	esp_r0 = pRegFrame->esp;
558
559	if ( eflags.Bits.u1VM /* illegal */
560	\|\| SELMToFlatEx(pVM, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
561	{
562	AssertMsgFailed(("Invalid stack %04X:%VGv???\n", ss_r0, esp_r0));
563	goto failure;
564	}
565	}
566	else
567	{
568	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
569	goto failure;
570	}
571	/*
572	* Build trap stack frame on guest handler's stack
573	*/
574	#ifdef IN_GC
575	Assert((pRegFrame->ss & X86_SEL_RPL) != 0);
576	rc = PGMVerifyAccess(pVM, (RTGCUINTPTR)pTrapStackGC - 6sizeof(uint32_t), 6 sizeof(uint32_t), X86_PTE_RW);
577	#else
578	Assert((pRegFrame->ss & X86_SEL_RPL) == 0 \|\| (pRegFrame->ss & X86_SEL_RPL) == 3);
579	if ( PAGE_ADDRESS(pTrapStackGC) != PAGE_ADDRESS(pTrapStackGC - 6sizeof(uint32_t)) / fail if we cross a page boundary */
580	\|\| VBOX_FAILURE((rc = PGMPhysGCPtr2HCPtr(pVM, pTrapStackGC, (PRTHCPTR)&pTrapStackHC)))
581	)
582	{
583	AssertRC(rc);
584	goto failure;
585	}
586	#endif
587	if (rc == VINF_SUCCESS)
588	{
589	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));
590
591	if (fConforming == false && dpl < cpl)
592	{
593	if ((pRegFrame->ss & X86_SEL_RPL) == 1)
594	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ss & ~1; /* Mask away traces of raw ring execution (ring 1). */
595	else
596	CTXSUFF(pTrapStack)[--idx] = pRegFrame->ss;
597
598	CTXSUFF(pTrapStack)[--idx] = pRegFrame->esp;
599	}
600
601	/* @note we use the original eflags, not the copy that includes the virtualized bits! */
602	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eflags.u32;
603
604	if ((pRegFrame->cs & X86_SEL_RPL) == 1)
605	CTXSUFF(pTrapStack)[--idx] = pRegFrame->cs & ~1; /* Mask away traces of raw ring execution (ring 1). */
606	else
607	CTXSUFF(pTrapStack)[--idx] = pRegFrame->cs;
608
609	if (enmType == TRPM_SOFTWARE_INT)
610	{
611	Assert(opsize);
612	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eip + opsize; /* return address = next instruction */
613	}
614	else
615	CTXSUFF(pTrapStack)[--idx] = pRegFrame->eip;
616
617	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
618	{
619	CTXSUFF(pTrapStack)[--idx] = pVM->trpm.s.uActiveErrorCode;
620	}
621
622	Assert(esp_r0 > -idx*sizeof(uint32_t));
623	/* Adjust ESP accordingly */
624	esp_r0 += idx*sizeof(uint32_t);
625
626	/* Mask away dangerous flags for the trap/interrupt handler. */
627	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
628	#ifdef DEBUG
629	for (int j=idx;j<0;j++)
630	{
631	LogFlow(("Stack %VGv pos %02d: %08x\n", &CTXSUFF(pTrapStack)[j], j, CTXSUFF(pTrapStack)[j]));
632	}
633	char *pszPrefix = "";
634	char *szEFlags = "";
635
636	LogFlow(( "%seax=%08x %sebx=%08x %secx=%08x %sedx=%08x %sesi=%08x %sedi=%08x\n"
637	"%seip=%08x %sesp=%08x %sebp=%08x %siopl=%d %*s\n"
638	"%scs=%04x %sds=%04x %ses=%04x %sfs=%04x %sgs=%04x %seflags=%08x\n",
639	pszPrefix, pRegFrame->eax, pszPrefix, pRegFrame->ebx, pszPrefix, pRegFrame->ecx, pszPrefix, pRegFrame->edx, pszPrefix, pRegFrame->esi, pszPrefix, pRegFrame->edi,
640	pszPrefix, pRegFrame->eip, pszPrefix, pRegFrame->esp, pszPrefix, pRegFrame->ebp, pszPrefix, eflags.Bits.u2IOPL, *pszPrefix ? 33 : 31, szEFlags,
641	pszPrefix, (RTSEL)pRegFrame->cs, pszPrefix, (RTSEL)pRegFrame->ds, pszPrefix, (RTSEL)pRegFrame->es,
642	pszPrefix, (RTSEL)pRegFrame->fs, pszPrefix, (RTSEL)pRegFrame->gs, pszPrefix, eflags.u32));
643	#endif
644
645	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));
646
647	//// AssertMsg(ASMGetCR2() == pTrpm->uActiveCR2, ("current cr2=%08x trpm cr2=%08x\n", ASMGetCR2(), pTrpm->uActiveCR2));
648
649	/* Make sure the internal guest context structure is up-to-date. */
650	CPUMSetGuestCR2(pVM, pVM->trpm.s.uActiveCR2);
651
652	#ifdef IN_GC
653	/** @note shouldn't be necessary */
654	ASMSetCR2(pVM->trpm.s.uActiveCR2);
655
656	/* Turn off interrupts for interrupt gates. */
657	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
658	CPUMRawSetEFlags(pVM, pRegFrame, eflags.u32 & ~X86_EFL_IF);
659
660	/* The virtualized bits must be removed again!! */
661	eflags.Bits.u1IF = 1;
662	eflags.Bits.u2IOPL = 0;
663
664	STAM_COUNTER_INC(&pVM->trpm.s.CTXALLSUFF(paStatForwardedIRQ)[iGate]);
665	Assert(eflags.Bits.u1IF);
666	Assert(eflags.Bits.u2IOPL == 0);
667	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate], eflags.u32, ss_r0, (RTGCPTR)esp_r0);
668	/* does not return */
669	#else
670	/* Turn off interrupts for interrupt gates. */
671	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
672	eflags.Bits.u1IF = 0;
673
674	pRegFrame->eflags.u32 = eflags.u32;
675
676	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
677	pRegFrame->cs = GuestIdte.Gen.u16SegSel;
678	pRegFrame->esp = esp_r0;
679	pRegFrame->ss = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
680	return VINF_SUCCESS;
681	#endif
682	}
683	else
684	Log(("TRAP%02X: PGMVerifyAccess %VGv failed with %Vrc -> forward to REM\n", iGate, pTrapStackGC, rc));
685	}
686	else
687	Log(("SELMValidateAndConvertCSAddr failed with %Vrc\n", rc));
688	}
689	else
690	Log(("MMRamRead %VGv size %d failed with %Vrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
691	}
692	else
693	{
694	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
695	#ifdef VBOX_WITH_STATISTICS
696	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
697	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
698	else
699	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
700	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
701	#endif
702	}
703	failure:
704	STAM_COUNTER_INC(&CTXSUFF(pVM->trpm.s.StatForwardFail));
705
706	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]));
707	#endif
708	return VINF_EM_RAW_GUEST_TRAP;
709	}
710
711
712	/**
713	* Raises a cpu exception which doesn't take an error code.
714	*
715	* This function may or may not dispatch the exception before returning.
716	*
717	* @returns VBox status code fit for scheduling.
718	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
719	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
720	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
721	*
722	* @param pVM The VM handle.
723	* @param pCtxCore The CPU context core.
724	* @param enmXcpt The exception.
725	*/
726	TRPMDECL(int) TRPMRaiseXcpt(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
727	{
728	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs, pCtxCore->eip, enmXcpt));
729	/** @todo dispatch the trap. */
730	pVM->trpm.s.uActiveVector = enmXcpt;
731	pVM->trpm.s.fActiveSoftwareInterrupt = false;
732	pVM->trpm.s.uActiveErrorCode = 0xdeadbeef;
733	pVM->trpm.s.uActiveCR2 = 0xdeadface;
734	return VINF_EM_RAW_GUEST_TRAP;
735	}
736
737
738	/**
739	* Raises a cpu exception with an errorcode.
740	*
741	* This function may or may not dispatch the exception before returning.
742	*
743	* @returns VBox status code fit for scheduling.
744	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
745	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
746	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
747	*
748	* @param pVM The VM handle.
749	* @param pCtxCore The CPU context core.
750	* @param enmXcpt The exception.
751	* @param uErr The error code.
752	*/
753	TRPMDECL(int) TRPMRaiseXcptErr(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
754	{
755	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr));
756	/** @todo dispatch the trap. */
757	pVM->trpm.s.uActiveVector = enmXcpt;
758	pVM->trpm.s.fActiveSoftwareInterrupt = false;
759	pVM->trpm.s.uActiveErrorCode = uErr;
760	pVM->trpm.s.uActiveCR2 = 0xdeadface;
761	return VINF_EM_RAW_GUEST_TRAP;
762	}
763
764
765	/**
766	* Raises a cpu exception with an errorcode and CR2.
767	*
768	* This function may or may not dispatch the exception before returning.
769	*
770	* @returns VBox status code fit for scheduling.
771	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
772	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
773	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
774	*
775	* @param pVM The VM handle.
776	* @param pCtxCore The CPU context core.
777	* @param enmXcpt The exception.
778	* @param uErr The error code.
779	* @param uCR2 The CR2 value.
780	*/
781	TRPMDECL(int) TRPMRaiseXcptErrCR2(PVM pVM, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
782	{
783	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs, pCtxCore->eip, enmXcpt, uErr, uCR2));
784	/** @todo dispatch the trap. */
785	pVM->trpm.s.uActiveVector = enmXcpt;
786	pVM->trpm.s.fActiveSoftwareInterrupt = false;
787	pVM->trpm.s.uActiveErrorCode = uErr;
788	pVM->trpm.s.uActiveCR2 = uCR2;
789	return VINF_EM_RAW_GUEST_TRAP;
790	}
791

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source: vbox/trunk/src/VBox/VMM/VMMAll/TRPMAll.cpp@ 1

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