TRPMGCHandlers.cpp@ 1108

Last change on this file since 1108 was 1089, checked in by vboxsync, 18 years ago
Fixed broken return path in generic trap handler for v86 code
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 38.0 KB

Line
1	/* $Id: TRPMGCHandlers.cpp 1089 2007-02-28 08:42:35Z vboxsync $ */
2	/** @file
3	* TRPM - Guest Context Trap Handlers, CPP part
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/selm.h>
28	#include <VBox/iom.h>
29	#include <VBox/pgm.h>
30	#include <VBox/pdm.h>
31	#include <VBox/dbgf.h>
32	#include <VBox/em.h>
33	#include <VBox/csam.h>
34	#include <VBox/patm.h>
35	#include <VBox/mm.h>
36	#include <VBox/cpum.h>
37	#include "TRPMInternal.h"
38	#include <VBox/vm.h>
39	#include <VBox/param.h>
40
41	#include <VBox/err.h>
42	#include <VBox/dis.h>
43	#include <VBox/disopcode.h>
44	#include <VBox/x86.h>
45	#include <VBox/log.h>
46	#include <VBox/tm.h>
47	#include <iprt/asm.h>
48	#include <iprt/assert.h>
49
50	/* still here. MODR/M byte parsing */
51	#define X86_OPCODE_MODRM_MOD_MASK 0xc0
52	#define X86_OPCODE_MODRM_REG_MASK 0x38
53	#define X86_OPCODE_MODRM_RM_MASK 0x07
54
55	/** Pointer to a readonly hypervisor trap record. */
56	typedef const struct TRPMGCHYPER *PCTRPMGCHYPER;
57
58	/**
59	* A hypervisor trap record.
60	* This contains information about a handler for a instruction range.
61	*
62	* @remark This must match what TRPM_HANDLER outputs.
63	*/
64	typedef struct TRPMGCHYPER
65	{
66	/** The start address. */
67	uintptr_t uStartEIP;
68	/** The end address. (exclusive)
69	* If NULL the it's only for the instruction at pvStartEIP. */
70	uintptr_t uEndEIP;
71	/**
72	* The handler.
73	*
74	* @returns VBox status code
75	* VINF_SUCCESS means we've handled the trap.
76	* Any other error code means returning to the host context.
77	* @param pVM The VM handle.
78	* @param pRegFrame The register frame.
79	* @param uUser The user argument.
80	*/
81	DECLCALLBACKMEMBER(int, pfnHandler)(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser);
82	/** Whatever the handler desires to put here. */
83	uintptr_t uUser;
84	} TRPMGCHYPER;
85
86
87	/*******************************************************************************
88	* Global Variables *
89	*******************************************************************************/
90	__BEGIN_DECLS
91	/** Defined in VMMGC0.asm or VMMGC99.asm.
92	* @{ */
93	extern const TRPMGCHYPER g_aTrap0bHandlers[1];
94	extern const TRPMGCHYPER g_aTrap0bHandlersEnd[1];
95	extern const TRPMGCHYPER g_aTrap0dHandlers[1];
96	extern const TRPMGCHYPER g_aTrap0dHandlersEnd[1];
97	extern const TRPMGCHYPER g_aTrap0eHandlers[1];
98	extern const TRPMGCHYPER g_aTrap0eHandlersEnd[1];
99	/** @} */
100	__END_DECLS
101
102
103	/*******************************************************************************
104	* Internal Functions *
105	*******************************************************************************/
106	__BEGIN_DECLS /* addressed from asm (not called so no DECLASM). */
107	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser);
108	__END_DECLS
109
110
111
112	/**
113	* Exits the trap, called when exiting a trap handler.
114	*
115	* Will reset the trap if it's not a guest trap or the trap
116	* is already handled. Will process resume guest FFs.
117	*
118	* @returns rc.
119	* @param pVM VM handle.
120	* @param rc The VBox status code to return.
121	* @param pRegFrame Pointer to the register frame for the trap.
122	*/
123	static int trpmGCExitTrap(PVM pVM, int rc, PCPUMCTXCORE pRegFrame)
124	{
125	uint32_t uOldActiveVector = pVM->trpm.s.uActiveVector;
126
127	/* Reset trap? */
128	if ( rc != VINF_EM_RAW_GUEST_TRAP
129	&& rc != VINF_EM_RAW_RING_SWITCH_INT)
130	pVM->trpm.s.uActiveVector = ~0;
131
132	#ifdef VBOX_HIGH_RES_TIMERS_HACK
133	/*
134	* Occationally we should poll timers.
135	* We must NOT do this too frequently as it adds a significant overhead
136	* and it'll kill us if the trap load is high. (See #1354.)
137	* (The heuristic is not very intelligent, we should really check trap
138	* frequency etc. here, but alas, we lack any such information atm.)
139	*/
140	static unsigned s_iTimerPoll = 0;
141	if (rc == VINF_SUCCESS)
142	{
143	if (!(++s_iTimerPoll & 0xf))
144	{
145	uint64_t cTicks = TMTimerPoll(pVM); NOREF(cTicks);
146	Log2(("TMTimerPoll at %VGv returned %RX64 (VM_FF_TIMER=%d)\n", pRegFrame->eip, cTicks, VM_FF_ISPENDING(pVM, VM_FF_TIMER)));
147	}
148	}
149	else
150	s_iTimerPoll = 0;
151	#endif
152
153	/* Clear pending inhibit interrupt state if required. (necessary for dispatching interrupts later on) */
154	if (VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS))
155	{
156	Log2(("VM_FF_INHIBIT_INTERRUPTS at %VGv successor %VGv\n", pRegFrame->eip, EMGetInhibitInterruptsPC(pVM)));
157	if (pRegFrame->eip != EMGetInhibitInterruptsPC(pVM))
158	{
159	/** @note we intentionally don't clear VM_FF_INHIBIT_INTERRUPTS here if the eip is the same as the inhibited instr address.
160	* Before we are able to execute this instruction in raw mode (iret to guest code) an external interrupt might
161	* force a world switch again. Possibly allowing a guest interrupt to be dispatched in the process. This could
162	* break the guest. Sounds very unlikely, but such timing sensitive problem are not as rare as you might think.
163	*/
164	VM_FF_CLEAR(pVM, VM_FF_INHIBIT_INTERRUPTS);
165	}
166	}
167
168	/*
169	* Pending resume-guest-FF?
170	* Or pending (A)PIC interrupt? Windows XP will crash if we delay APIC interrupts.
171	*/
172	if ( rc == VINF_SUCCESS
173	&& VM_FF_ISPENDING(pVM, VM_FF_TO_R3 \| VM_FF_TIMER \| VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC \| VM_FF_PGM_SYNC_CR3 \| VM_FF_PGM_SYNC_CR3_NON_GLOBAL \| VM_FF_REQUEST))
174	{
175	/* Pending Ring-3 action. */
176	if (VM_FF_ISPENDING(pVM, VM_FF_TO_R3))
177	{
178	VM_FF_CLEAR(pVM, VM_FF_TO_R3);
179	rc = VINF_EM_RAW_TO_R3;
180	}
181	/* Pending timer action. */
182	else if (VM_FF_ISPENDING(pVM, VM_FF_TIMER))
183	rc = VINF_EM_RAW_TIMER_PENDING;
184	/* Pending interrupt: dispatch it. */
185	else if ( VM_FF_ISPENDING(pVM, VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC)
186	&& !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS)
187	&& PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame)
188	)
189	{
190	uint8_t u8Interrupt;
191	rc = PDMGetInterrupt(pVM, &u8Interrupt);
192	Log(("trpmGCExitTrap: u8Interrupt=%d (%#x) rc=%Vrc\n", u8Interrupt, u8Interrupt, rc));
193	AssertFatalMsgRC(rc, ("PDMGetInterrupt failed with %Vrc\n", rc));
194	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)u8Interrupt, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_HARDWARE_INT);
195	/* can't return if successful */
196	Assert(rc != VINF_SUCCESS);
197
198	/* Stop the profile counter that was started in TRPMGCHandlersA.asm */
199	Assert(uOldActiveVector <= 16);
200	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a);
201
202	/* Assert the trap and go to the recompiler to dispatch it. */
203	TRPMAssertTrap(pVM, u8Interrupt, false);
204
205	STAM_PROFILE_ADV_START(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a);
206	rc = VINF_EM_RAW_INTERRUPT_PENDING;
207	}
208	/*
209	* Try sync CR3?
210	* This ASSUMES that the MOV CRx, x emulation doesn't return with VINF_PGM_SYNC_CR3. (a bit hackish)
211	*/
212	else if (VM_FF_ISPENDING(pVM, VM_FF_PGM_SYNC_CR3 \| VM_FF_PGM_SYNC_CR3_NON_GLOBAL))
213	#if 1
214	rc = PGMSyncCR3(pVM, CPUMGetGuestCR0(pVM), CPUMGetGuestCR3(pVM), CPUMGetGuestCR4(pVM), VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3));
215	#else
216	rc = VINF_PGM_SYNC_CR3;
217	#endif
218	/* Pending request packets might contain actions that need immediate attention, such as pending hardware interrupts. */
219	else if (VM_FF_ISPENDING(pVM, VM_FF_REQUEST))
220	rc = VINF_EM_PENDING_REQUEST;
221	}
222
223	AssertMsg( rc != VINF_SUCCESS
224	\|\| ( pRegFrame->eflags.Bits.u1IF
225	&& ( pRegFrame->eflags.Bits.u2IOPL < (unsigned)(pRegFrame->ss & X86_SEL_RPL) \|\| pRegFrame->eflags.Bits.u1VM))
226	, ("rc = %VGv\neflags=%RX32 ss=%RTsel IOPL=%d\n", rc, pRegFrame->eflags.u32, pRegFrame->ss, pRegFrame->eflags.Bits.u2IOPL));
227	return rc;
228	}
229
230
231	/**
232	* \#DB (Debug event) handler.
233	*
234	* @returns VBox status code.
235	* VINF_SUCCESS means we completely handled this trap,
236	* other codes are passed execution to host context.
237	*
238	* @param pTrpm Pointer to TRPM data (within VM).
239	* @param pRegFrame Pointer to the register frame for the trap.
240	* @internal
241	*/
242	DECLASM(int) TRPMGCTrap01Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
243	{
244	RTGCUINTREG uDr6 = ASMGetAndClearDR6();
245	PVM pVM = TRPM2VM(pTrpm);
246	LogFlow(("TRPMGCTrap01Handler: cs:eip=%04x:%08x uDr6=%RTreg\n", pRegFrame->cs, pRegFrame->eip, uDr6));
247
248	/*
249	* We currently don't make sure of the X86_DR7_GD bit, but
250	* there might come a time when we do.
251	*/
252	if ((uDr6 & X86_DR6_BD) == X86_DR6_BD)
253	{
254	AssertReleaseMsgFailed(("X86_DR6_BD isn't used, but it's set! dr7=%RTreg(%RTreg) dr6=%RTreg\n",
255	ASMGetDR7(), CPUMGetHyperDR7(pVM), uDr6));
256	return VERR_NOT_IMPLEMENTED;
257	}
258
259	AssertReleaseMsg(!(uDr6 & X86_DR6_BT), ("X86_DR6_BT is impossible!\n"));
260
261	/*
262	* Now leave the rest to the DBGF.
263	*/
264	int rc = DBGFGCTrap01Handler(pVM, pRegFrame, uDr6);
265	if (rc == VINF_EM_RAW_GUEST_TRAP)
266	CPUMSetGuestDR6(pVM, uDr6);
267
268	return trpmGCExitTrap(pVM, rc, pRegFrame);
269	}
270
271
272
273	/**
274	* NMI handler, for when we are using NMIs to debug things.
275	*
276	* @returns VBox status code.
277	* VINF_SUCCESS means we completely handled this trap,
278	* other codes are passed execution to host context.
279	*
280	* @param pTrpm Pointer to TRPM data (within VM).
281	* @param pRegFrame Pointer to the register frame for the trap.
282	* @internal
283	* @remark This is not hooked up unless you're building with VBOX_WITH_NMI defined.
284	*/
285	DECLASM(int) TRPMGCTrap02Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
286	{
287	LogFlow(("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
288	RTLogComPrintf("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip);
289	return VERR_TRPM_DONT_PANIC;
290	}
291
292
293	/**
294	* \#BP (Breakpoint) handler.
295	*
296	* @returns VBox status code.
297	* VINF_SUCCESS means we completely handled this trap,
298	* other codes are passed execution to host context.
299	*
300	* @param pTrpm Pointer to TRPM data (within VM).
301	* @param pRegFrame Pointer to the register frame for the trap.
302	* @internal
303	*/
304	DECLASM(int) TRPMGCTrap03Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
305	{
306	LogFlow(("TRPMGCTrap03Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
307	PVM pVM = TRPM2VM(pTrpm);
308	int rc;
309
310	/*
311	* Both PATM are using INT3s, let them have a go first.
312	*/
313	if ((pRegFrame->ss & X86_SEL_RPL) == 1)
314	{
315	rc = PATMHandleInt3PatchTrap(pVM, pRegFrame);
316	if (rc == VINF_SUCCESS \|\| rc == VINF_EM_RAW_EMULATE_INSTR \|\| rc == VINF_PATM_PATCH_INT3 \|\| rc == VINF_PATM_DUPLICATE_FUNCTION)
317	return trpmGCExitTrap(pVM, rc, pRegFrame);
318	}
319	rc = DBGFGCTrap03Handler(pVM, pRegFrame);
320	/* anything we should do with this? Schedule it in GC? */
321	return trpmGCExitTrap(pVM, rc, pRegFrame);
322	}
323
324
325	/**
326	* Trap handler for illegal opcode fault (\#UD).
327	*
328	* @returns VBox status code.
329	* VINF_SUCCESS means we completely handled this trap,
330	* other codes are passed execution to host context.
331	*
332	* @param pTrpm Pointer to TRPM data (within VM).
333	* @param pRegFrame Pointer to the register frame for the trap.
334	* @internal
335	*/
336	DECLASM(int) TRPMGCTrap06Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
337	{
338	PVM pVM = TRPM2VM(pTrpm);
339
340	LogFlow(("TRPMGCTrap06Handler %VGv eflags=%x\n", pRegFrame->eip, pRegFrame->eflags.u32));
341
342	if ( (pRegFrame->ss & X86_SEL_RPL) == 1
343	&& PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
344	{
345	/*
346	* Decode the instruction.
347	*/
348	RTGCPTR PC;
349	int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
350	if (VBOX_FAILURE(rc))
351	{
352	Log(("TRPMGCTrap06Handler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
353	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
354	}
355
356	DISCPUSTATE Cpu;
357	uint32_t cbOp;
358	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
359	if (VBOX_FAILURE(rc))
360	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
361
362	/** @note monitor causes an #UD exception instead of #GP when not executed in ring 0. */
363	if (Cpu.pCurInstr->opcode == OP_ILLUD2)
364	{
365	int rc = PATMHandleIllegalInstrTrap(pVM, pRegFrame);
366	if (rc == VINF_SUCCESS \|\| rc == VINF_EM_RAW_EMULATE_INSTR \|\| rc == VINF_PATM_DUPLICATE_FUNCTION \|\| rc == VINF_PATM_PENDING_IRQ_AFTER_IRET)
367	return trpmGCExitTrap(pVM, rc, pRegFrame);
368	}
369	}
370	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
371	}
372
373
374	/**
375	* Trap handler for device not present fault (\#NM).
376	*
377	* Device not available, FP or (F)WAIT instruction.
378	*
379	* @returns VBox status code.
380	* VINF_SUCCESS means we completely handled this trap,
381	* other codes are passed execution to host context.
382	*
383	* @param pTrpm Pointer to TRPM data (within VM).
384	* @param pRegFrame Pointer to the register frame for the trap.
385	* @internal
386	*/
387	DECLASM(int) TRPMGCTrap07Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
388	{
389	PVM pVM = TRPM2VM(pTrpm);
390
391	LogFlow(("TRPMTrap07HandlerGC: eip=%VGv\n", pRegFrame->eip));
392	return CPUMHandleLazyFPU(pVM);
393	}
394
395
396	/**
397	* \#NP ((segment) Not Present) handler.
398	*
399	* @returns VBox status code.
400	* VINF_SUCCESS means we completely handled this trap,
401	* other codes are passed execution to host context.
402	*
403	* @param pTrpm Pointer to TRPM data (within VM).
404	* @param pRegFrame Pointer to the register frame for the trap.
405	* @internal
406	*/
407	DECLASM(int) TRPMGCTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
408	{
409	LogFlow(("TRPMGCTrap0bHandler: eip=%VGv\n", pRegFrame->eip));
410	PVM pVM = TRPM2VM(pTrpm);
411
412	/*
413	* Try to detect instruction by opcode which caused trap.
414	* XXX note: this code may cause \#PF (trap e) or \#GP (trap d) while
415	* accessing user code. need to handle it somehow in future!
416	*/
417	uint8_t *pu8Code;
418	if (SELMValidateAndConvertCSAddr(pVM, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, (PRTGCPTR)&pu8Code) == VINF_SUCCESS)
419	{
420	/*
421	* First skip possible instruction prefixes, such as:
422	* OS, AS
423	* CS:, DS:, ES:, SS:, FS:, GS:
424	* REPE, REPNE
425	*
426	* note: Currently we supports only up to 4 prefixes per opcode, more
427	* prefixes (normally not used anyway) will cause trap d in guest.
428	* note: Instruction length in IA-32 may be up to 15 bytes, we dont
429	* check this issue, its too hard.
430	*/
431	for (unsigned i = 0; i < 4; i++)
432	{
433	if ( pu8Code[0] != 0xf2 /* REPNE/REPNZ */
434	&& pu8Code[0] != 0xf3 /* REP/REPE/REPZ */
435	&& pu8Code[0] != 0x2e /* CS: */
436	&& pu8Code[0] != 0x36 /* SS: */
437	&& pu8Code[0] != 0x3e /* DS: */
438	&& pu8Code[0] != 0x26 /* ES: */
439	&& pu8Code[0] != 0x64 /* FS: */
440	&& pu8Code[0] != 0x65 /* GS: */
441	&& pu8Code[0] != 0x66 /* OS */
442	&& pu8Code[0] != 0x67 /* AS */
443	)
444	break;
445	pu8Code++;
446	}
447
448	/*
449	* Detect right switch using a callgate.
450	*
451	* We recognize the following causes for the trap 0b:
452	* CALL FAR, CALL FAR []
453	* JMP FAR, JMP FAR []
454	* IRET (may cause a task switch)
455	*
456	* Note: we can't detect whether the trap was caused by a call to a
457	* callgate descriptor or it is a real trap 0b due to a bad selector.
458	* In both situations we'll pass execution to our recompiler so we don't
459	* have to worry.
460	* If we wanted to do better detection, we have set GDT entries to callgate
461	* descriptors pointing to our own handlers.
462	*/
463	/** @todo not sure about IRET, may generate Trap 0d (\#GP), NEED TO CHECK! */
464	if ( pu8Code[0] == 0x9a /* CALL FAR */
465	\|\| ( pu8Code[0] == 0xff /* CALL FAR [] */
466	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x18)
467	\|\| pu8Code[0] == 0xea /* JMP FAR */
468	\|\| ( pu8Code[0] == 0xff /* JMP FAR [] */
469	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x28)
470	\|\| pu8Code[0] == 0xcf /* IRET */
471	)
472	{
473	/*
474	* Got potential call to callgate.
475	* We simply return execution to the recompiler to do emulation
476	* starting from the instruction which caused the trap.
477	*/
478	pTrpm->uActiveVector = ~0;
479	return VINF_EM_RAW_RING_SWITCH;
480	}
481	}
482
483	/*
484	* Pass trap 0b as is to the recompiler in all other cases.
485	*/
486	return VINF_EM_RAW_GUEST_TRAP;
487	}
488
489
490	/**
491	* \#GP (General Protection Fault) handler for Ring-0 privileged instructions.
492	*
493	* @returns VBox status code.
494	* VINF_SUCCESS means we completely handled this trap,
495	* other codes are passed execution to host context.
496	*
497	* @param pVM The VM handle.
498	* @param pRegFrame Pointer to the register frame for the trap.
499	* @param pCpu The opcode info.
500	* @param PC Program counter.
501	*/
502	static int trpmGCTrap0dHandlerRing0(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
503	{
504	int rc;
505
506	/*
507	* Try handle it here, if not return to HC and emulate/interpret it there.
508	*/
509	switch (pCpu->pCurInstr->opcode)
510	{
511	case OP_INT3:
512	/*
513	* Little hack to make the code below not fail
514	*/
515	pCpu->param1.flags = USE_IMMEDIATE8;
516	pCpu->param1.parval = 3;
517	/* fallthru */
518	case OP_INT:
519	{
520	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
521	Assert(!(PATMIsPatchGCAddr(pVM, PC)));
522	if (pCpu->param1.parval == 3)
523	{
524	/* Obsolete!! */
525	/* Int 3 replacement patch? */
526	if (PATMHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS)
527	{
528	AssertFailed();
529	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
530	}
531	}
532	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
533	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
534	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
535
536	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
537	pVM->trpm.s.fActiveSoftwareInterrupt = true;
538	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
539	}
540
541	#ifdef PATM_EMULATE_SYSENTER
542	case OP_SYSEXIT:
543	case OP_SYSRET:
544	rc = PATMSysCall(pVM, pRegFrame, pCpu);
545	return trpmGCExitTrap(pVM, rc, pRegFrame);
546	#endif
547
548	case OP_HLT:
549	/* If it's in patch code, defer to ring-3. */
550	if (PATMIsPatchGCAddr(pVM, PC))
551	break;
552
553	pRegFrame->eip += pCpu->opsize;
554	return trpmGCExitTrap(pVM, VINF_EM_HALT, pRegFrame);
555
556
557	/*
558	* These instructions are used by PATM and CASM for finding
559	* dangerous non-trapping instructions. Thus, since all
560	* scanning and patching is done in ring-3 we'll have to
561	* return to ring-3 on the first encounter of these instructions.
562	*/
563	case OP_MOV_CR:
564	case OP_MOV_DR:
565	/* We can safely emulate control/debug register move instructions in patched code. */
566	if ( !PATMIsPatchGCAddr(pVM, PC)
567	&& !CSAMIsKnownDangerousInstr(pVM, PC))
568	break;
569	case OP_INVLPG:
570	case OP_LLDT:
571	case OP_STI:
572	case OP_RDTSC:
573	{
574	uint32_t cbIgnored;
575	rc = EMInterpretInstructionCPU(pVM, pCpu, pRegFrame, PC, &cbIgnored);
576	if (VBOX_SUCCESS(rc))
577	pRegFrame->eip += pCpu->opsize;
578	else if (rc == VERR_EM_INTERPRETER)
579	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
580	return trpmGCExitTrap(pVM, rc, pRegFrame);
581	}
582	}
583
584	return trpmGCExitTrap(pVM, VINF_EM_RAW_EXCEPTION_PRIVILEGED, pRegFrame);
585	}
586
587
588	/**
589	* \#GP (General Protection Fault) handler for Ring-3.
590	*
591	* @returns VBox status code.
592	* VINF_SUCCESS means we completely handled this trap,
593	* other codes are passed execution to host context.
594	*
595	* @param pVM The VM handle.
596	* @param pRegFrame Pointer to the register frame for the trap.
597	* @param pCpu The opcode info.
598	*/
599	static int trpmGCTrap0dHandlerRing3(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
600	{
601	int rc;
602
603	switch (pCpu->pCurInstr->opcode)
604	{
605	/*
606	* STI and CLI are I/O privileged, i.e. if IOPL
607	*/
608	case OP_STI:
609	case OP_CLI:
610	{
611	uint32_t efl = CPUMRawGetEFlags(pVM, pRegFrame);
612	if (X86_EFL_GET_IOPL(efl) >= (unsigned)(pRegFrame->ss & X86_SEL_RPL))
613	{
614	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n"));
615	return trpmGCExitTrap(pVM, VINF_EM_RESCHEDULE_REM, pRegFrame);
616	}
617	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0)\n"));
618	break;
619	}
620
621	/*
622	* INT3 and INT xx are ring-switching.
623	* (The shadow IDT will have set the entries to DPL=0, that's why we're here.)
624	*/
625	case OP_INT3:
626	/*
627	* Little hack to make the code below not fail
628	*/
629	pCpu->param1.flags = USE_IMMEDIATE8;
630	pCpu->param1.parval = 3;
631	/* fall thru */
632	case OP_INT:
633	{
634	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
635	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
636	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
637	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
638
639	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
640	pVM->trpm.s.fActiveSoftwareInterrupt = true;
641	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
642	}
643
644	/*
645	* SYSCALL, SYSENTER, INTO and BOUND are also ring-switchers.
646	*/
647	case OP_SYSCALL:
648	case OP_SYSENTER:
649	#ifdef PATM_EMULATE_SYSENTER
650	rc = PATMSysCall(pVM, pRegFrame, pCpu);
651	if (rc == VINF_SUCCESS)
652	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
653	/* else no break; */
654	#endif
655	case OP_BOUND:
656	case OP_INTO:
657	pVM->trpm.s.uActiveVector = ~0;
658	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH, pRegFrame);
659	}
660
661	/*
662	* A genuine guest fault.
663	*/
664	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
665	}
666
667
668	/**
669	* \#GP (General Protection Fault) handler.
670	*
671	* @returns VBox status code.
672	* VINF_SUCCESS means we completely handled this trap,
673	* other codes are passed execution to host context.
674	*
675	* @param pVM The VM handle.
676	* @param pTrpm Pointer to TRPM data (within VM).
677	* @param pRegFrame Pointer to the register frame for the trap.
678	*/
679	static int trpmGCTrap0dHandler(PVM pVM, PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
680	{
681	LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%VGv uErr=%RX32\n", pRegFrame->ss, pRegFrame->eip, pTrpm->uActiveErrorCode));
682
683	#if 0 /* not right for iret. Shouldn't really be needed as SELMValidateAndConvertCSAddr deals with invalid cs. */
684	/*
685	* Filter out selector problems first as these may mean that the
686	* instruction isn't safe to read. If we're here because CS is NIL
687	* the flattening of cs:eip will deal with that.
688	*/
689	if ( !(pTrpm->uActiveErrorCode & (X86_TRAP_ERR_IDT \| X86_TRAP_ERR_EXTERNAL))
690	&& (pTrpm->uActiveErrorCode & X86_TRAP_ERR_SEL_MASK))
691	{
692	/* It's a guest trap. */
693	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
694	}
695	#endif
696
697	STAM_PROFILE_ADV_START(&pVM->trpm.s.StatTrap0dDisasm, a);
698
699	/* We always set IOPL to zero which makes e.g. pushf fault in V86 mode. The guest might use IOPL=3 and therefor not expect a #GP.
700	* Simply fall back to the recompiler to emulate this instruction.
701	*/
702	if (pRegFrame->eflags.Bits.u1VM)
703	{
704	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
705	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
706	}
707
708	/*
709	* Decode the instruction.
710	*/
711	RTGCPTR PC;
712	int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
713	if (VBOX_FAILURE(rc))
714	{
715	Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n",
716	pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
717	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
718	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
719	}
720
721	DISCPUSTATE Cpu;
722	uint32_t cbOp;
723	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
724	if (VBOX_FAILURE(rc))
725	{
726	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
727	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
728	}
729	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
730
731	/*
732	* Deal with I/O port access.
733	*/
734	if ( pVM->trpm.s.uActiveErrorCode == 0
735	&& (Cpu.pCurInstr->optype & OPTYPE_PORTIO))
736	{
737	rc = EMInterpretPortIO(pVM, pRegFrame, &Cpu, cbOp);
738	return trpmGCExitTrap(pVM, rc, pRegFrame);
739	}
740
741	/*
742	* Deal with Ring-0 (privileged instructions)
743	*/
744	if ( (pRegFrame->ss & X86_SEL_RPL) <= 1
745	&& !pRegFrame->eflags.Bits.u1VM)
746	return trpmGCTrap0dHandlerRing0(pVM, pRegFrame, &Cpu, PC);
747
748	/*
749	* Deal with Ring-3 GPs.
750	*/
751	if (!pRegFrame->eflags.Bits.u1VM)
752	return trpmGCTrap0dHandlerRing3(pVM, pRegFrame, &Cpu);
753
754	/** @todo what about V86 mode? */
755	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
756	}
757
758
759	/**
760	* \#GP (General Protection Fault) handler.
761	*
762	* @returns VBox status code.
763	* VINF_SUCCESS means we completely handled this trap,
764	* other codes are passed execution to host context.
765	*
766	* @param pTrpm Pointer to TRPM data (within VM).
767	* @param pRegFrame Pointer to the register frame for the trap.
768	* @internal
769	*/
770	DECLASM(int) TRPMGCTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
771	{
772	LogFlow(("TRPMGCTrap0dHandler: eip=%RGv\n", pRegFrame->eip));
773	PVM pVM = TRPM2VM(pTrpm);
774
775	int rc = trpmGCTrap0dHandler(pVM, pTrpm, pRegFrame);
776	switch (rc)
777	{
778	case VINF_EM_RAW_GUEST_TRAP:
779	case VINF_EM_RAW_EXCEPTION_PRIVILEGED:
780	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
781	rc = VINF_PATM_PATCH_TRAP_GP;
782	break;
783
784	case VINF_EM_RAW_INTERRUPT_PENDING:
785	Assert(TRPMHasTrap(pVM));
786	/* no break; */
787	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
788	case VINF_IOM_HC_IOPORT_READWRITE:
789	case VINF_IOM_HC_IOPORT_READ:
790	case VINF_IOM_HC_IOPORT_WRITE:
791	case VINF_IOM_HC_MMIO_WRITE:
792	case VINF_IOM_HC_MMIO_READ:
793	case VINF_IOM_HC_MMIO_READ_WRITE:
794	case VINF_PATM_PATCH_INT3:
795	case VINF_EM_RAW_TO_R3:
796	case VINF_EM_RAW_TIMER_PENDING:
797	case VINF_EM_PENDING_REQUEST:
798	case VINF_EM_HALT:
799	case VINF_SUCCESS:
800	break;
801
802	default:
803	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("return code %d\n", rc));
804	break;
805	}
806	return rc;
807	}
808
809	/**
810	* \#PF (Page Fault) handler.
811	*
812	* Calls PGM which does the actual handling.
813	*
814	*
815	* @returns VBox status code.
816	* VINF_SUCCESS means we completely handled this trap,
817	* other codes are passed execution to host context.
818	*
819	* @param pTrpm Pointer to TRPM data (within VM).
820	* @param pRegFrame Pointer to the register frame for the trap.
821	* @internal
822	*/
823	DECLASM(int) TRPMGCTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
824	{
825	LogBird(("TRPMGCTrap0eHandler: eip=%RGv\n", pRegFrame->eip));
826	PVM pVM = TRPM2VM(pTrpm);
827
828	/*
829	* This is all PGM stuff.
830	*/
831	int rc = PGMTrap0eHandler(pVM, pTrpm->uActiveErrorCode, pRegFrame, (RTGCPTR)pTrpm->uActiveCR2);
832
833	switch (rc)
834	{
835	case VINF_EM_RAW_EMULATE_INSTR:
836	case VINF_EM_RAW_EMULATE_INSTR_PD_FAULT:
837	case VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT:
838	case VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT:
839	case VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT:
840	case VINF_EM_RAW_EMULATE_INSTR_IDT_FAULT:
841	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
842	rc = VINF_PATCH_EMULATE_INSTR;
843	break;
844
845	case VINF_EM_RAW_GUEST_TRAP:
846	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
847	return VINF_PATM_PATCH_TRAP_PF;
848
849	rc = TRPMForwardTrap(pVM, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
850	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
851	break;
852
853	case VINF_EM_RAW_INTERRUPT_PENDING:
854	Assert(TRPMHasTrap(pVM));
855	/* no break; */
856	case VINF_IOM_HC_MMIO_READ:
857	case VINF_IOM_HC_MMIO_WRITE:
858	case VINF_IOM_HC_MMIO_READ_WRITE:
859	case VINF_PATM_HC_MMIO_PATCH_READ:
860	case VINF_PATM_HC_MMIO_PATCH_WRITE:
861	case VINF_SUCCESS:
862	case VINF_EM_RAW_TO_R3:
863	case VINF_EM_PENDING_REQUEST:
864	case VINF_EM_RAW_TIMER_PENDING:
865	case VINF_CSAM_PENDING_ACTION:
866	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
867	break;
868
869	default:
870	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip));
871	break;
872	}
873	return trpmGCExitTrap(pVM, rc, pRegFrame);
874	}
875
876
877	/**
878	* Scans for the EIP in the specified array of trap handlers.
879	*
880	* If we don't fine the EIP, we'll panic.
881	*
882	* @returns VBox status code.
883	*
884	* @param pVM The VM handle.
885	* @param pRegFrame Pointer to the register frame for the trap.
886	* @param paHandlers The array of trap handler records.
887	* @param pEndRecord The end record (exclusive).
888	*/
889	static int trpmGCHyperGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, PCTRPMGCHYPER paHandlers, PCTRPMGCHYPER pEndRecord)
890	{
891	uintptr_t uEip = (uintptr_t)pRegFrame->eip;
892	Assert(paHandlers <= pEndRecord);
893
894	Log(("trpmGCHyperGeneric: uEip=%x %p-%p\n", uEip, paHandlers, pEndRecord));
895
896	#if 0 /// @todo later
897	/*
898	* Start by doing a kind of binary search.
899	*/
900	unsigned iStart = 0;
901	unsigned iEnd = pEndRecord - paHandlers;
902	unsigned i = iEnd / 2;
903	#endif
904
905	/*
906	* Do a linear search now (in case the array wasn't properly sorted).
907	*/
908	for (PCTRPMGCHYPER pCur = paHandlers; pCur < pEndRecord; pCur++)
909	{
910	if ( pCur->uStartEIP <= uEip
911	&& (pCur->uEndEIP ? pCur->uEndEIP > uEip : pCur->uStartEIP == uEip))
912	return pCur->pfnHandler(pVM, pRegFrame, pCur->uUser);
913	}
914
915	return VERR_TRPM_DONT_PANIC;
916	}
917
918
919	/**
920	* Hypervisor \#NP ((segment) Not Present) handler.
921	*
922	* Scans for the EIP in the registered trap handlers.
923	*
924	* @returns VBox status code.
925	* VINF_SUCCESS means we completely handled this trap,
926	* other codes are passed back to host context.
927	*
928	* @param pTrpm Pointer to TRPM data (within VM).
929	* @param pRegFrame Pointer to the register frame for the trap.
930	* @internal
931	*/
932	DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
933	{
934	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0bHandlers, g_aTrap0bHandlersEnd);
935	}
936
937
938	/**
939	* Hypervisor \#GP (General Protection Fault) handler.
940	*
941	* Scans for the EIP in the registered trap handlers.
942	*
943	* @returns VBox status code.
944	* VINF_SUCCESS means we completely handled this trap,
945	* other codes are passed back to host context.
946	*
947	* @param pTrpm Pointer to TRPM data (within VM).
948	* @param pRegFrame Pointer to the register frame for the trap.
949	* @internal
950	*/
951	DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
952	{
953	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
954	}
955
956
957	/**
958	* Hypervisor \#PF (Page Fault) handler.
959	*
960	* Scans for the EIP in the registered trap handlers.
961	*
962	* @returns VBox status code.
963	* VINF_SUCCESS means we completely handled this trap,
964	* other codes are passed back to host context.
965	*
966	* @param pTrpm Pointer to TRPM data (within VM).
967	* @param pRegFrame Pointer to the register frame for the trap.
968	* @internal
969	*/
970	DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
971	{
972	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
973	}
974
975
976	/**
977	* Deal with hypervisor traps occuring when resuming execution on a trap.
978	*
979	* @returns VBox status code.
980	* @param pVM The VM handle.
981	* @param pRegFrame Register frame.
982	* @param uUser User arg.
983	*/
984	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
985	{
986	Log(("trpmGCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
987
988	if (uUser & TRPM_TRAP_IN_HYPER)
989	{
990	/*
991	* Check that there is still some stack left, if not we'll flag
992	* a guru meditation (the alternative is a triple fault).
993	*/
994	RTGCUINTPTR cbStackUsed = (RTGCUINTPTR)VMMGetStackGC(pVM) - pRegFrame->esp;
995	if (cbStackUsed > VMM_STACK_SIZE - _1K)
996	{
997	LogRel(("trpmGCTrapInGeneric: ran out of stack: esp=#x cbStackUsed=%#x\n", pRegFrame->esp, cbStackUsed));
998	return VERR_TRPM_DONT_PANIC;
999	}
1000
1001	/*
1002	* Just zero the register containing the selector in question.
1003	* We'll deal with the actual stale or troublesome selector value in
1004	* the outermost trap frame.
1005	*/
1006	PCPUMCTXCORE pCoreCtx = (PCPUMCTXCORE)pRegFrame->esp;
1007	switch (uUser & TRPM_TRAP_IN_OP_MASK)
1008	{
1009	case TRPM_TRAP_IN_MOV_GS:
1010	pRegFrame->eax = 0;
1011	pRegFrame->gs = 0; /* prevent recursive trouble. */
1012	break;
1013	case TRPM_TRAP_IN_MOV_FS:
1014	pRegFrame->eax = 0;
1015	pRegFrame->fs = 0; /* prevent recursive trouble. */
1016	return VINF_SUCCESS;
1017
1018	default:
1019	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1020	return VERR_INTERNAL_ERROR;
1021	}
1022	}
1023	else
1024	{
1025	/*
1026	* Reconstruct the guest context and switch to the recompiler.
1027	* We ASSUME we're only at
1028	*/
1029	CPUMCTXCORE CtxCore = *pRegFrame;
1030	uint32_t pEsp = (uint32_t )pRegFrame->esp;
1031	int rc;
1032
1033	switch (uUser)
1034	{
1035	/*
1036	* This will only occur when resuming guest code in a trap handler!
1037	*/
1038	/* @note ASSUMES esp points to the temporary guest CPUMCTXCORE!!! */
1039	case TRPM_TRAP_IN_MOV_GS:
1040	case TRPM_TRAP_IN_MOV_FS:
1041	case TRPM_TRAP_IN_MOV_ES:
1042	case TRPM_TRAP_IN_MOV_DS:
1043	{
1044	PCPUMCTXCORE pTempGuestCtx = (PCPUMCTXCORE)pEsp;
1045
1046	/* Just copy the whole thing; several selector registers, eip (etc) and eax are not yet in pRegFrame. */
1047	CtxCore = *pTempGuestCtx;
1048	rc = VINF_EM_RAW_STALE_SELECTOR;
1049	break;
1050	}
1051
1052	/*
1053	* This will only occur when resuming guest code!
1054	*/
1055	case TRPM_TRAP_IN_IRET:
1056	CtxCore.eip = *pEsp++;
1057	CtxCore.cs = (RTSEL)*pEsp++;
1058	CtxCore.eflags.u32 = *pEsp++;
1059	CtxCore.esp = *pEsp++;
1060	CtxCore.ss = (RTSEL)*pEsp++;
1061	rc = VINF_EM_RAW_IRET_TRAP;
1062	break;
1063
1064	/*
1065	* This will only occur when resuming V86 guest code!
1066	*/
1067	case TRPM_TRAP_IN_IRET \| TRPM_TRAP_IN_V86:
1068	CtxCore.eip = *pEsp++;
1069	CtxCore.cs = (RTSEL)*pEsp++;
1070	CtxCore.eflags.u32 = *pEsp++;
1071	CtxCore.esp = *pEsp++;
1072	CtxCore.ss = (RTSEL)*pEsp++;
1073	CtxCore.es = (RTSEL)*pEsp++;
1074	CtxCore.ds = (RTSEL)*pEsp++;
1075	CtxCore.fs = (RTSEL)*pEsp++;
1076	CtxCore.gs = (RTSEL)*pEsp++;
1077	rc = VINF_EM_RAW_IRET_TRAP;
1078	break;
1079
1080	default:
1081	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1082	return VERR_INTERNAL_ERROR;
1083	}
1084
1085
1086	CPUMSetGuestCtxCore(pVM, &CtxCore);
1087	TRPMGCHyperReturnToHost(pVM, rc);
1088	}
1089
1090	AssertMsgFailed(("Impossible!\n"));
1091	return VERR_INTERNAL_ERROR;
1092	}
1093

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source: vbox/trunk/src/VBox/VMM/VMMGC/TRPMGCHandlers.cpp@ 1108

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