TRPMAll.cpp@ 6537

Last change on this file since 6537 was 5999, checked in by vboxsync, 17 years ago
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1	/* $Id: TRPMAll.cpp 5999 2007-12-07 15:05:06Z vboxsync $ */
2	/** @file
3	* TRPM - Trap Monitor - Any Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (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/trpm.h>
24	#include <VBox/pgm.h>
25	#include <VBox/mm.h>
26	#include <VBox/patm.h>
27	#include <VBox/selm.h>
28	#include "TRPMInternal.h"
29	#include <VBox/vm.h>
30	#include <VBox/err.h>
31	#include <VBox/x86.h>
32	#include <VBox/em.h>
33
34	#include <VBox/log.h>
35	#include <iprt/assert.h>
36	#include <iprt/asm.h>
37	#include <iprt/param.h>
38
39
40
41	/**
42	* Query info about the current active trap/interrupt.
43	* If no trap is active active an error code is returned.
44	*
45	* @returns VBox status code.
46	* @param pVM The virtual machine.
47	* @param pu8TrapNo Where to store the trap number.
48	* @param pEnmType Where to store the trap type
49	*/
50	TRPMDECL(int) TRPMQueryTrap(PVM pVM, uint8_t pu8TrapNo, TRPMEVENT pEnmType)
51	{
52	/*
53	* Check if we have a trap at present.
54	*/
55	if (pVM->trpm.s.uActiveVector != ~0U)
56	{
57	if (pu8TrapNo)
58	*pu8TrapNo = (uint8_t)pVM->trpm.s.uActiveVector;
59	if (pEnmType)
60	*pEnmType = pVM->trpm.s.enmActiveType;
61	return VINF_SUCCESS;
62	}
63
64	return VERR_TRPM_NO_ACTIVE_TRAP;
65	}
66
67
68	/**
69	* Gets the trap number for the current trap.
70	*
71	* The caller is responsible for making sure there is an active trap which
72	* takes an error code when making this request.
73	*
74	* @returns The current trap number.
75	* @param pVM VM handle.
76	*/
77	TRPMDECL(uint8_t) TRPMGetTrapNo(PVM pVM)
78	{
79	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
80	return (uint8_t)pVM->trpm.s.uActiveVector;
81	}
82
83
84	/**
85	* Gets the error code for the current trap.
86	*
87	* The caller is responsible for making sure there is an active trap which
88	* takes an error code when making this request.
89	*
90	* @returns Error code.
91	* @param pVM VM handle.
92	*/
93	TRPMDECL(RTGCUINT) TRPMGetErrorCode(PVM pVM)
94	{
95	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
96	#ifdef VBOX_STRICT
97	switch (pVM->trpm.s.uActiveVector)
98	{
99	case 0x0a:
100	case 0x0b:
101	case 0x0c:
102	case 0x0d:
103	case 0x0e:
104	case 0x11:
105	case 0x08:
106	break;
107	default:
108	AssertMsgFailed(("This trap (%#x) doesn't have any error code\n", pVM->trpm.s.uActiveVector));
109	break;
110	}
111	#endif
112	return pVM->trpm.s.uActiveErrorCode;
113	}
114
115
116	/**
117	* Gets the fault address for the current trap.
118	*
119	* The caller is responsible for making sure there is an active trap 0x0e when
120	* making this request.
121	*
122	* @returns Fault address associated with the trap.
123	* @param pVM VM handle.
124	*/
125	TRPMDECL(RTGCUINTPTR) TRPMGetFaultAddress(PVM pVM)
126	{
127	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
128	AssertMsg(pVM->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
129	return pVM->trpm.s.uActiveCR2;
130	}
131
132
133	/**
134	* Clears the current active trap/exception/interrupt.
135	*
136	* The caller is responsible for making sure there is an active trap
137	* when making this request.
138	*
139	* @returns VBox status code.
140	* @param pVM The virtual machine handle.
141	*/
142	TRPMDECL(int) TRPMResetTrap(PVM pVM)
143	{
144	/*
145	* Cannot reset non-existing trap!
146	*/
147	if (pVM->trpm.s.uActiveVector == ~0U)
148	{
149	AssertMsgFailed(("No active trap!\n"));
150	return VERR_TRPM_NO_ACTIVE_TRAP;
151	}
152
153	/*
154	* Reset it.
155	*/
156	pVM->trpm.s.uActiveVector = ~0U;
157	return VINF_SUCCESS;
158	}
159
160
161	/**
162	* Assert trap/exception/interrupt.
163	*
164	* The caller is responsible for making sure there is no active trap
165	* when making this request.
166	*
167	* @returns VBox status code.
168	* @param pVM The virtual machine.
169	* @param u8TrapNo The trap vector to assert.
170	* @param enmType Trap type.
171	*/
172	TRPMDECL(int) TRPMAssertTrap(PVM pVM, uint8_t u8TrapNo, TRPMEVENT enmType)
173	{
174	Log2(("TRPMAssertTrap: u8TrapNo=%02x type=%d\n", u8TrapNo, enmType));
175
176	/*
177	* Cannot assert a trap when one is already active.
178	*/
179	if (pVM->trpm.s.uActiveVector != ~0U)
180	{
181	AssertMsgFailed(("Active trap %#x\n", pVM->trpm.s.uActiveVector));
182	return VERR_TRPM_ACTIVE_TRAP;
183	}
184
185	pVM->trpm.s.uActiveVector = u8TrapNo;
186	pVM->trpm.s.enmActiveType = enmType;
187	pVM->trpm.s.uActiveErrorCode = ~0;
188	pVM->trpm.s.uActiveCR2 = 0xdeadface;
189	return VINF_SUCCESS;
190	}
191
192
193	/**
194	* Sets the error code of the current trap.
195	* (This function is for use in trap handlers and such.)
196	*
197	* The caller is responsible for making sure there is an active trap
198	* which takes an errorcode when making this request.
199	*
200	* @param pVM The virtual machine.
201	* @param uErrorCode The new error code.
202	*/
203	TRPMDECL(void) TRPMSetErrorCode(PVM pVM, RTGCUINT uErrorCode)
204	{
205	Log2(("TRPMSetErrorCode: uErrorCode=%VGv\n", uErrorCode));
206	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
207	pVM->trpm.s.uActiveErrorCode = uErrorCode;
208	#ifdef VBOX_STRICT
209	switch (pVM->trpm.s.uActiveVector)
210	{
211	case 0x0a: case 0x0b: case 0x0c: case 0x0d: case 0x0e:
212	AssertMsg(uErrorCode != ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
213	break;
214	case 0x11: case 0x08:
215	AssertMsg(uErrorCode == 0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
216	break;
217	default:
218	AssertMsg(uErrorCode == ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVM->trpm.s.uActiveVector));
219	break;
220	}
221	#endif
222	}
223
224
225	/**
226	* Sets the error code of the current trap.
227	* (This function is for use in trap handlers and such.)
228	*
229	* The caller is responsible for making sure there is an active trap 0e
230	* when making this request.
231	*
232	* @param pVM The virtual machine.
233	* @param uCR2 The new fault address (cr2 register).
234	*/
235	TRPMDECL(void) TRPMSetFaultAddress(PVM pVM, RTGCUINTPTR uCR2)
236	{
237	Log2(("TRPMSetFaultAddress: uCR2=%VGv\n", uCR2));
238	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
239	AssertMsg(pVM->trpm.s.uActiveVector == 0xe, ("Not trap 0e!\n"));
240	pVM->trpm.s.uActiveCR2 = uCR2;
241	}
242
243
244	/**
245	* Checks if the current active trap/interrupt/exception/fault/whatever is a software
246	* interrupt or not.
247	*
248	* The caller is responsible for making sure there is an active trap
249	* when making this request.
250	*
251	* @returns true if software interrupt, false if not.
252	*
253	* @param pVM VM handle.
254	*/
255	TRPMDECL(bool) TRPMIsSoftwareInterrupt(PVM pVM)
256	{
257	AssertMsg(pVM->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
258	return (pVM->trpm.s.enmActiveType == TRPM_SOFTWARE_INT);
259	}
260
261
262	/**
263	* Check if there is an active trap.
264	*
265	* @returns true if trap active, false if not.
266	* @param pVM The virtual machine.
267	*/
268	TRPMDECL(bool) TRPMHasTrap(PVM pVM)
269	{
270	return pVM->trpm.s.uActiveVector != ~0U;
271	}
272
273
274	/**
275	* Query all info about the current active trap/interrupt.
276	* If no trap is active active an error code is returned.
277	*
278	* @returns VBox status code.
279	* @param pVM The virtual machine.
280	* @param pu8TrapNo Where to store the trap number.
281	* @param pEnmType Where to store the trap type
282	* @param puErrorCode Where to store the error code associated with some traps.
283	* ~0U is stored if the trap has no error code.
284	* @param puCR2 Where to store the CR2 associated with a trap 0E.
285	*/
286	TRPMDECL(int) TRPMQueryTrapAll(PVM pVM, uint8_t pu8TrapNo, TRPMEVENT pEnmType, PRTGCUINT puErrorCode, PRTGCUINTPTR puCR2)
287	{
288	/*
289	* Check if we have a trap at present.
290	*/
291	if (pVM->trpm.s.uActiveVector == ~0U)
292	return VERR_TRPM_NO_ACTIVE_TRAP;
293
294	if (pu8TrapNo)
295	*pu8TrapNo = (uint8_t)pVM->trpm.s.uActiveVector;
296	if (pEnmType)
297	*pEnmType = pVM->trpm.s.enmActiveType;
298	if (puErrorCode)
299	*puErrorCode = pVM->trpm.s.uActiveErrorCode;
300	if (puCR2)
301	*puCR2 = pVM->trpm.s.uActiveCR2;
302
303	return VINF_SUCCESS;
304	}
305
306
307	/**
308	* Save the active trap.
309	*
310	* This routine useful when doing try/catch in the hypervisor.
311	* Any function which uses temporary trap handlers should
312	* probably also use this facility to save the original trap.
313	*
314	* @param pVM VM handle.
315	*/
316	TRPMDECL(void) TRPMSaveTrap(PVM pVM)
317	{
318	pVM->trpm.s.uSavedVector = pVM->trpm.s.uActiveVector;
319	pVM->trpm.s.enmSavedType = pVM->trpm.s.enmActiveType;
320	pVM->trpm.s.uSavedErrorCode = pVM->trpm.s.uActiveErrorCode;
321	pVM->trpm.s.uSavedCR2 = pVM->trpm.s.uActiveCR2;
322	}
323
324
325	/**
326	* Restore a saved trap.
327	*
328	* Multiple restores of a saved trap is possible.
329	*
330	* @param pVM VM handle.
331	*/
332	TRPMDECL(void) TRPMRestoreTrap(PVM pVM)
333	{
334	pVM->trpm.s.uActiveVector = pVM->trpm.s.uSavedVector;
335	pVM->trpm.s.enmActiveType = pVM->trpm.s.enmSavedType;
336	pVM->trpm.s.uActiveErrorCode = pVM->trpm.s.uSavedErrorCode;
337	pVM->trpm.s.uActiveCR2 = pVM->trpm.s.uSavedCR2;
338	}
339
340	#ifndef IN_RING0
341	/**
342	* Forward trap or interrupt to the guest's handler
343	*
344	*
345	* @returns VBox status code.
346	* or does not return at all (when the trap is actually forwarded)
347	*
348	* @param pVM The VM to operate on.
349	* @param pRegFrame Pointer to the register frame for the trap.
350	* @param iGate Trap or interrupt gate number
351	* @param opsize Instruction size (only relevant for software interrupts)
352	* @param enmError TRPM_TRAP_HAS_ERRORCODE or TRPM_TRAP_NO_ERRORCODE.
353	* @param enmType TRPM event type
354	* @internal
355	*/
356	TRPMDECL(int) TRPMForwardTrap(PVM pVM, PCPUMCTXCORE pRegFrame, uint32_t iGate, uint32_t opsize, TRPMERRORCODE enmError, TRPMEVENT enmType)
357	{
358	#ifdef TRPM_FORWARD_TRAPS_IN_GC
359	X86EFLAGS eflags;
360
361	STAM_PROFILE_ADV_START(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
362
363	#ifdef DEBUG
364	if (pRegFrame->eflags.Bits.u1VM)
365	Log(("TRPMForwardTrap-VM: eip=%04X:%04X iGate=%d\n", pRegFrame->cs, pRegFrame->eip, iGate));
366	else
367	Log(("TRPMForwardTrap: eip=%04X:%VGv iGate=%d\n", pRegFrame->cs, pRegFrame->eip, iGate));
368
369	switch (iGate) {
370	case 14:
371	if (pRegFrame->eip == pVM->trpm.s.uActiveCR2)
372	{
373	int rc;
374	RTGCPTR pCallerGC;
375	#ifdef IN_GC
376	rc = MMGCRamRead(pVM, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
377	#else
378	rc = PGMPhysReadGCPtr(pVM, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
379	#endif
380	if (VBOX_SUCCESS(rc))
381	{
382	Log(("TRPMForwardTrap: caller=%VGv\n", pCallerGC));
383	}
384	}
385	/* no break */
386	case 8:
387	case 10:
388	case 11:
389	case 12:
390	case 13:
391	case 17:
392	Assert(enmError == TRPM_TRAP_HAS_ERRORCODE \|\| enmType == TRPM_SOFTWARE_INT);
393	break;
394
395	default:
396	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
397	break;
398	}
399	#endif /* DEBUG */
400
401	/* Retrieve the eflags including the virtualized bits. */
402	/* Note: hackish as the cpumctxcore structure doesn't contain the right value */
403	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
404
405	/* VM_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
406	Assert(enmType != TRPM_HARDWARE_INT \|\| !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS));
407
408	/*
409	* 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.
410	* Well, only if the IF flag is set.
411	*/
412	/*
413	* @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.
414	*
415	*/
416	if ( pVM->trpm.s.aGuestTrapHandler[iGate]
417	&& (eflags.Bits.u1IF)
418	#ifndef VBOX_RAW_V86
419	&& !(eflags.Bits.u1VM) /* @todo implement when needed (illegal for same privilege level transfers). */
420	#endif
421	&& !PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)
422	)
423	{
424	uint16_t cbIDT;
425	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVM, &cbIDT);
426	uint32_t cpl;
427	VBOXIDTE GuestIdte;
428	RTGCPTR pIDTEntry;
429	int rc;
430
431	Assert(PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame));
432	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));
433
434	/* Get the current privilege level. */
435	cpl = CPUMGetGuestCPL(pVM, pRegFrame);
436
437	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
438	goto failure;
439
440	/*
441	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
442	* All very obscure, but still necessary.
443	* Currently only some CS & TSS selector checks are missing.
444	*
445	*/
446	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
447	#ifdef IN_GC
448	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
449	#else
450	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
451	#endif
452	if (VBOX_FAILURE(rc))
453	{
454	/* The page might be out of sync. (@todo might cross a page boundary) */
455	Log(("Page %VGv out of sync -> prefetch and try again\n", pIDTEntry));
456	rc = PGMPrefetchPage(pVM, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
457	if (rc != VINF_SUCCESS)
458	{
459	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Vrc\n", rc));
460	goto failure;
461	}
462	#ifdef IN_GC
463	rc = MMGCRamRead(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
464	#else
465	rc = PGMPhysReadGCPtr(pVM, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
466	#endif
467	}
468	if ( VBOX_SUCCESS(rc)
469	&& GuestIdte.Gen.u1Present
470	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
471	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
472	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
473	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
474	)
475	{
476	RTGCPTR pHandler, dummy;
477	GCPTRTYPE(uint32_t *) pTrapStackGC;
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
484	/* Note: don't use current eflags as we might be in V86 mode and the IDT always contains protected mode selectors */
485	X86EFLAGS fakeflags;
486	fakeflags.u32 = 0;
487
488	rc = SELMValidateAndConvertCSAddr(pVM, fakeflags, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
489	if (rc == VINF_SUCCESS)
490	{
491	VBOXGDTR gdtr = {0};
492	bool fConforming = false;
493	int idx = 0;
494	uint32_t dpl;
495	uint32_t ss_r0;
496	uint32_t esp_r0;
497	VBOXDESC Desc;
498	RTGCPTR pGdtEntry;
499
500	CPUMGetGuestGDTR(pVM, &gdtr);
501	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
502
503	if (!gdtr.pGdt)
504	goto failure;
505
506	pGdtEntry = (RTGCPTR)(uintptr_t)&((VBOXDESC *)gdtr.pGdt)[GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT]; /// @todo fix this
507	#ifdef IN_GC
508	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
509	#else
510	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
511	#endif
512	if (VBOX_FAILURE(rc))
513	{
514	/* The page might be out of sync. (@todo might cross a page boundary) */
515	Log(("Page %VGv out of sync -> prefetch and try again\n", pGdtEntry));
516	rc = PGMPrefetchPage(pVM, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
517	if (rc != VINF_SUCCESS)
518	{
519	Log(("PGMPrefetchPage failed with rc=%Vrc\n", rc));
520	goto failure;
521	}
522	#ifdef IN_GC
523	rc = MMGCRamRead(pVM, &Desc, pGdtEntry, sizeof(Desc));
524	#else
525	rc = PGMPhysReadGCPtr(pVM, &Desc, pGdtEntry, sizeof(Desc));
526	#endif
527	if (VBOX_FAILURE(rc))
528	{
529	Log(("MMGCRamRead failed with %Vrc\n", rc));
530	goto failure;
531	}
532	}
533
534	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
535	{
536	Log(("Conforming code selector\n"));
537	fConforming = true;
538	}
539	/** @todo check descriptor type!! */
540
541	dpl = Desc.Gen.u2Dpl;
542
543	if (!fConforming && dpl < cpl) /* to inner privilege level */
544	{
545	rc = SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
546	if (VBOX_FAILURE(rc))
547	goto failure;
548
549	Assert((ss_r0 & X86_SEL_RPL) == 1);
550
551	if ( !esp_r0
552	\|\| !ss_r0
553	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
554	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
555	)
556	{
557	Log(("Invalid ring 0 stack %04X:%VGv\n", ss_r0, esp_r0));
558	goto failure;
559	}
560	}
561	else
562	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
563	{
564	ss_r0 = pRegFrame->ss;
565	esp_r0 = pRegFrame->esp;
566
567	if ( eflags.Bits.u1VM /* illegal */
568	\|\| SELMToFlatEx(pVM, fakeflags, ss_r0, (RTGCPTR)esp_r0, NULL, SELMTOFLAT_FLAGS_CPL1, (PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
569	{
570	AssertMsgFailed(("Invalid stack %04X:%VGv??? (VM=%d)\n", ss_r0, esp_r0, eflags.Bits.u1VM));
571	goto failure;
572	}
573	}
574	else
575	{
576	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
577	goto failure;
578	}
579	/*
580	* Build trap stack frame on guest handler's stack
581	*/
582	uint32_t *pTrapStack;
583	#ifdef IN_GC
584	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss & X86_SEL_RPL) != 0);
585	/* Check maximum amount we need (10 when executing in V86 mode) */
586	rc = PGMVerifyAccess(pVM, (RTGCUINTPTR)pTrapStackGC - 10sizeof(uint32_t), 10 sizeof(uint32_t), X86_PTE_RW);
587	pTrapStack = pTrapStackGC;
588	#else
589	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss & X86_SEL_RPL) == 0 \|\| (pRegFrame->ss & X86_SEL_RPL) == 3);
590	/* Check maximum amount we need (10 when executing in V86 mode) */
591	if ((pTrapStackGC >> PAGE_SHIFT) != ((pTrapStackGC - 10sizeof(uint32_t)) >> PAGE_SHIFT)) / fail if we cross a page boundary */
592	goto failure;
593	PGMPAGEMAPLOCK PageMappingLock;
594	rc = PGMPhysGCPtr2CCPtr(pVM, pTrapStackGC, (void **)&pTrapStack, &PageMappingLock);
595	if (VBOX_FAILURE(rc))
596	{
597	AssertRC(rc);
598	goto failure;
599	}
600	#endif
601	if (rc == VINF_SUCCESS)
602	{
603	/** if eflags.Bits.u1VM then push gs, fs, ds, es */
604	if (eflags.Bits.u1VM)
605	{
606	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));
607	pTrapStack[--idx] = pRegFrame->gs;
608	pTrapStack[--idx] = pRegFrame->fs;
609	pTrapStack[--idx] = pRegFrame->ds;
610	pTrapStack[--idx] = pRegFrame->es;
611
612	/* clear ds, es, fs & gs in current context */
613	pRegFrame->ds = pRegFrame->es = pRegFrame->fs = pRegFrame->gs = 0;
614	}
615	else
616	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));
617
618	if (!fConforming && dpl < cpl)
619	{
620	if ((pRegFrame->ss & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
621	pTrapStack[--idx] = pRegFrame->ss & ~1; /* Mask away traces of raw ring execution (ring 1). */
622	else
623	pTrapStack[--idx] = pRegFrame->ss;
624
625	pTrapStack[--idx] = pRegFrame->esp;
626	}
627
628	/* Note: We use the eflags copy, that includes the virtualized bits! */
629	/* Note: Not really necessary as we grab include those bits in the trap/irq handler trampoline */
630	pTrapStack[--idx] = eflags.u32;
631
632	if ((pRegFrame->cs & X86_SEL_RPL) == 1 && !eflags.Bits.u1VM)
633	pTrapStack[--idx] = pRegFrame->cs & ~1; /* Mask away traces of raw ring execution (ring 1). */
634	else
635	pTrapStack[--idx] = pRegFrame->cs;
636
637	if (enmType == TRPM_SOFTWARE_INT)
638	{
639	Assert(opsize);
640	pTrapStack[--idx] = pRegFrame->eip + opsize; /* return address = next instruction */
641	}
642	else
643	pTrapStack[--idx] = pRegFrame->eip;
644
645	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
646	{
647	pTrapStack[--idx] = pVM->trpm.s.uActiveErrorCode;
648	}
649
650	Assert(esp_r0 > -idx*sizeof(uint32_t));
651	/* Adjust ESP accordingly */
652	esp_r0 += idx*sizeof(uint32_t);
653
654	/* Mask away dangerous flags for the trap/interrupt handler. */
655	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
656	#ifdef DEBUG
657	for (int j=idx;j<0;j++)
658	{
659	LogFlow(("Stack %VGv pos %02d: %08x\n", &pTrapStack[j], j, pTrapStack[j]));
660	}
661	const char *pszPrefix = "";
662	const char *szEFlags = "";
663
664	LogFlow(( "%seax=%08x %sebx=%08x %secx=%08x %sedx=%08x %sesi=%08x %sedi=%08x\n"
665	"%seip=%08x %sesp=%08x %sebp=%08x %siopl=%d %*s\n"
666	"%scs=%04x %sds=%04x %ses=%04x %sfs=%04x %sgs=%04x %seflags=%08x\n",
667	pszPrefix, pRegFrame->eax, pszPrefix, pRegFrame->ebx, pszPrefix, pRegFrame->ecx, pszPrefix, pRegFrame->edx, pszPrefix, pRegFrame->esi, pszPrefix, pRegFrame->edi,
668	pszPrefix, pRegFrame->eip, pszPrefix, pRegFrame->esp, pszPrefix, pRegFrame->ebp, pszPrefix, eflags.Bits.u2IOPL, *pszPrefix ? 33 : 31, szEFlags,
669	pszPrefix, (RTSEL)pRegFrame->cs, pszPrefix, (RTSEL)pRegFrame->ds, pszPrefix, (RTSEL)pRegFrame->es,
670	pszPrefix, (RTSEL)pRegFrame->fs, pszPrefix, (RTSEL)pRegFrame->gs, pszPrefix, eflags.u32));
671	#endif
672
673	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));
674
675	/* Make sure the internal guest context structure is up-to-date. */
676	CPUMSetGuestCR2(pVM, pVM->trpm.s.uActiveCR2);
677
678	#ifdef IN_GC
679	/* Note: shouldn't be necessary */
680	ASMSetCR2(pVM->trpm.s.uActiveCR2);
681
682	/* Turn off interrupts for interrupt gates. */
683	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
684	CPUMRawSetEFlags(pVM, pRegFrame, eflags.u32 & ~X86_EFL_IF);
685
686	/* The virtualized bits must be removed again!! */
687	eflags.Bits.u1IF = 1;
688	eflags.Bits.u2IOPL = 0;
689
690	Assert(eflags.Bits.u1IF);
691	Assert(eflags.Bits.u2IOPL == 0);
692	STAM_COUNTER_INC(&pVM->trpm.s.CTXALLSUFF(paStatForwardedIRQ)[iGate]);
693	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
694
695	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate], eflags.u32, ss_r0, (RTGCPTR)esp_r0);
696	/* does not return */
697	#else
698	/* Turn off interrupts for interrupt gates. */
699	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
700	eflags.Bits.u1IF = 0;
701
702	pRegFrame->eflags.u32 = eflags.u32;
703
704	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
705	pRegFrame->cs = GuestIdte.Gen.u16SegSel;
706	pRegFrame->esp = esp_r0;
707	pRegFrame->ss = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
708	STAM_PROFILE_ADV_STOP(CTXSUFF(&pVM->trpm.s.StatForwardProf), a);
709	PGMPhysReleasePageMappingLock(pVM, &PageMappingLock);
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	#endif /* !IN_RING0 */
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.enmActiveType = TRPM_TRAP;
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.enmActiveType = TRPM_TRAP;
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.enmActiveType = TRPM_TRAP;
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@ 6537

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