TRPMGCHandlers.cpp@ 1995

Last change on this file since 1995 was 1981, checked in by vboxsync, 18 years ago
Arg. Forgot that EMInterpretInstructionCPU doesn't accept cpl != 0.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 39.9 KB

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1	/* $Id: TRPMGCHandlers.cpp 1981 2007-04-06 21:20:43Z 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	NOREF(uOldActiveVector);
127
128	/* Reset trap? */
129	if ( rc != VINF_EM_RAW_GUEST_TRAP
130	&& rc != VINF_EM_RAW_RING_SWITCH_INT)
131	pVM->trpm.s.uActiveVector = ~0;
132
133	#ifdef VBOX_HIGH_RES_TIMERS_HACK
134	/*
135	* Occationally we should poll timers.
136	* We must NOT do this too frequently as it adds a significant overhead
137	* and it'll kill us if the trap load is high. (See #1354.)
138	* (The heuristic is not very intelligent, we should really check trap
139	* frequency etc. here, but alas, we lack any such information atm.)
140	*/
141	static unsigned s_iTimerPoll = 0;
142	if (rc == VINF_SUCCESS)
143	{
144	if (!(++s_iTimerPoll & 0xf))
145	{
146	uint64_t cTicks = TMTimerPoll(pVM); NOREF(cTicks);
147	Log2(("TMTimerPoll at %VGv returned %RX64 (VM_FF_TIMER=%d)\n", pRegFrame->eip, cTicks, VM_FF_ISPENDING(pVM, VM_FF_TIMER)));
148	}
149	}
150	else
151	s_iTimerPoll = 0;
152	#endif
153
154	/* Clear pending inhibit interrupt state if required. (necessary for dispatching interrupts later on) */
155	if (VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS))
156	{
157	Log2(("VM_FF_INHIBIT_INTERRUPTS at %VGv successor %VGv\n", pRegFrame->eip, EMGetInhibitInterruptsPC(pVM)));
158	if (pRegFrame->eip != EMGetInhibitInterruptsPC(pVM))
159	{
160	/** @note we intentionally don't clear VM_FF_INHIBIT_INTERRUPTS here if the eip is the same as the inhibited instr address.
161	* Before we are able to execute this instruction in raw mode (iret to guest code) an external interrupt might
162	* force a world switch again. Possibly allowing a guest interrupt to be dispatched in the process. This could
163	* break the guest. Sounds very unlikely, but such timing sensitive problem are not as rare as you might think.
164	*/
165	VM_FF_CLEAR(pVM, VM_FF_INHIBIT_INTERRUPTS);
166	}
167	}
168
169	/*
170	* Pending resume-guest-FF?
171	* Or pending (A)PIC interrupt? Windows XP will crash if we delay APIC interrupts.
172	*/
173	if ( rc == VINF_SUCCESS
174	&& 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))
175	{
176	/* Pending Ring-3 action. */
177	if (VM_FF_ISPENDING(pVM, VM_FF_TO_R3))
178	{
179	VM_FF_CLEAR(pVM, VM_FF_TO_R3);
180	rc = VINF_EM_RAW_TO_R3;
181	}
182	/* Pending timer action. */
183	else if (VM_FF_ISPENDING(pVM, VM_FF_TIMER))
184	rc = VINF_EM_RAW_TIMER_PENDING;
185	/* Pending interrupt: dispatch it. */
186	else if ( VM_FF_ISPENDING(pVM, VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC)
187	&& !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS)
188	&& PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame)
189	)
190	{
191	uint8_t u8Interrupt;
192	rc = PDMGetInterrupt(pVM, &u8Interrupt);
193	Log(("trpmGCExitTrap: u8Interrupt=%d (%#x) rc=%Vrc\n", u8Interrupt, u8Interrupt, rc));
194	AssertFatalMsgRC(rc, ("PDMGetInterrupt failed with %Vrc\n", rc));
195	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)u8Interrupt, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_HARDWARE_INT);
196	/* can't return if successful */
197	Assert(rc != VINF_SUCCESS);
198
199	/* Stop the profile counter that was started in TRPMGCHandlersA.asm */
200	Assert(uOldActiveVector <= 16);
201	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a);
202
203	/* Assert the trap and go to the recompiler to dispatch it. */
204	TRPMAssertTrap(pVM, u8Interrupt, false);
205
206	STAM_PROFILE_ADV_START(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a);
207	rc = VINF_EM_RAW_INTERRUPT_PENDING;
208	}
209	/*
210	* Try sync CR3?
211	* This ASSUMES that the MOV CRx, x emulation doesn't return with VINF_PGM_SYNC_CR3. (a bit hackish)
212	*/
213	else if (VM_FF_ISPENDING(pVM, VM_FF_PGM_SYNC_CR3 \| VM_FF_PGM_SYNC_CR3_NON_GLOBAL))
214	#if 1
215	rc = PGMSyncCR3(pVM, CPUMGetGuestCR0(pVM), CPUMGetGuestCR3(pVM), CPUMGetGuestCR4(pVM), VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3));
216	#else
217	rc = VINF_PGM_SYNC_CR3;
218	#endif
219	/* Pending request packets might contain actions that need immediate attention, such as pending hardware interrupts. */
220	else if (VM_FF_ISPENDING(pVM, VM_FF_REQUEST))
221	rc = VINF_EM_PENDING_REQUEST;
222	}
223
224	AssertMsg( rc != VINF_SUCCESS
225	\|\| ( pRegFrame->eflags.Bits.u1IF
226	&& ( pRegFrame->eflags.Bits.u2IOPL < (unsigned)(pRegFrame->ss & X86_SEL_RPL) \|\| pRegFrame->eflags.Bits.u1VM))
227	, ("rc = %VGv\neflags=%RX32 ss=%RTsel IOPL=%d\n", rc, pRegFrame->eflags.u32, pRegFrame->ss, pRegFrame->eflags.Bits.u2IOPL));
228	return rc;
229	}
230
231
232	/**
233	* \#DB (Debug event) handler.
234	*
235	* @returns VBox status code.
236	* VINF_SUCCESS means we completely handled this trap,
237	* other codes are passed execution to host context.
238	*
239	* @param pTrpm Pointer to TRPM data (within VM).
240	* @param pRegFrame Pointer to the register frame for the trap.
241	* @internal
242	*/
243	DECLASM(int) TRPMGCTrap01Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
244	{
245	RTGCUINTREG uDr6 = ASMGetAndClearDR6();
246	PVM pVM = TRPM2VM(pTrpm);
247	LogFlow(("TRPMGCTrap01Handler: cs:eip=%04x:%08x uDr6=%RTreg\n", pRegFrame->cs, pRegFrame->eip, uDr6));
248
249	/*
250	* We currently don't make sure of the X86_DR7_GD bit, but
251	* there might come a time when we do.
252	*/
253	if ((uDr6 & X86_DR6_BD) == X86_DR6_BD)
254	{
255	AssertReleaseMsgFailed(("X86_DR6_BD isn't used, but it's set! dr7=%RTreg(%RTreg) dr6=%RTreg\n",
256	ASMGetDR7(), CPUMGetHyperDR7(pVM), uDr6));
257	return VERR_NOT_IMPLEMENTED;
258	}
259
260	AssertReleaseMsg(!(uDr6 & X86_DR6_BT), ("X86_DR6_BT is impossible!\n"));
261
262	/*
263	* Now leave the rest to the DBGF.
264	*/
265	int rc = DBGFGCTrap01Handler(pVM, pRegFrame, uDr6);
266	if (rc == VINF_EM_RAW_GUEST_TRAP)
267	CPUMSetGuestDR6(pVM, uDr6);
268
269	return trpmGCExitTrap(pVM, rc, pRegFrame);
270	}
271
272
273
274	/**
275	* NMI handler, for when we are using NMIs to debug things.
276	*
277	* @returns VBox status code.
278	* VINF_SUCCESS means we completely handled this trap,
279	* other codes are passed execution to host context.
280	*
281	* @param pTrpm Pointer to TRPM data (within VM).
282	* @param pRegFrame Pointer to the register frame for the trap.
283	* @internal
284	* @remark This is not hooked up unless you're building with VBOX_WITH_NMI defined.
285	*/
286	DECLASM(int) TRPMGCTrap02Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
287	{
288	LogFlow(("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
289	RTLogComPrintf("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip);
290	return VERR_TRPM_DONT_PANIC;
291	}
292
293
294	/**
295	* \#BP (Breakpoint) handler.
296	*
297	* @returns VBox status code.
298	* VINF_SUCCESS means we completely handled this trap,
299	* other codes are passed execution to host context.
300	*
301	* @param pTrpm Pointer to TRPM data (within VM).
302	* @param pRegFrame Pointer to the register frame for the trap.
303	* @internal
304	*/
305	DECLASM(int) TRPMGCTrap03Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
306	{
307	LogFlow(("TRPMGCTrap03Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
308	PVM pVM = TRPM2VM(pTrpm);
309	int rc;
310
311	/*
312	* Both PATM are using INT3s, let them have a go first.
313	*/
314	if ( (pRegFrame->ss & X86_SEL_RPL) == 1
315	&& !pRegFrame->eflags.Bits.u1VM)
316	{
317	rc = PATMHandleInt3PatchTrap(pVM, pRegFrame);
318	if (rc == VINF_SUCCESS \|\| rc == VINF_EM_RAW_EMULATE_INSTR \|\| rc == VINF_PATM_PATCH_INT3 \|\| rc == VINF_PATM_DUPLICATE_FUNCTION)
319	return trpmGCExitTrap(pVM, rc, pRegFrame);
320	}
321	rc = DBGFGCTrap03Handler(pVM, pRegFrame);
322	/* anything we should do with this? Schedule it in GC? */
323	return trpmGCExitTrap(pVM, rc, pRegFrame);
324	}
325
326
327	/**
328	* Trap handler for illegal opcode fault (\#UD).
329	*
330	* @returns VBox status code.
331	* VINF_SUCCESS means we completely handled this trap,
332	* other codes are passed execution to host context.
333	*
334	* @param pTrpm Pointer to TRPM data (within VM).
335	* @param pRegFrame Pointer to the register frame for the trap.
336	* @internal
337	*/
338	DECLASM(int) TRPMGCTrap06Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
339	{
340	PVM pVM = TRPM2VM(pTrpm);
341	int rc;
342
343	LogFlow(("TRPMGCTrap06Handler %VGv eflags=%x\n", pRegFrame->eip, pRegFrame->eflags.u32));
344
345	if ( (pRegFrame->ss & X86_SEL_RPL) == 1
346	&& !pRegFrame->eflags.Bits.u1VM
347	&& PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
348	{
349	/*
350	* Decode the instruction.
351	*/
352	RTGCPTR PC;
353	rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
354	if (VBOX_FAILURE(rc))
355	{
356	Log(("TRPMGCTrap06Handler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
357	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
358	}
359
360	DISCPUSTATE Cpu;
361	uint32_t cbOp;
362	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
363	if (VBOX_FAILURE(rc))
364	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
365
366	/** @note monitor causes an #UD exception instead of #GP when not executed in ring 0. */
367	if (Cpu.pCurInstr->opcode == OP_ILLUD2)
368	{
369	rc = PATMGCHandleIllegalInstrTrap(pVM, pRegFrame);
370	if (rc == VINF_SUCCESS \|\| rc == VINF_EM_RAW_EMULATE_INSTR \|\| rc == VINF_PATM_DUPLICATE_FUNCTION \|\| rc == VINF_PATM_PENDING_IRQ_AFTER_IRET \|\| rc == VINF_EM_RESCHEDULE)
371	return trpmGCExitTrap(pVM, rc, pRegFrame);
372	}
373	/* Never generate a raw trap here; it might be a monitor instruction, that requires emulation. */
374	rc = VINF_EM_RAW_EMULATE_INSTR;
375	}
376	else if (pRegFrame->eflags.Bits.u1VM)
377	{
378	rc = TRPMForwardTrap(pVM, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP);
379	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
380	}
381	else
382	/* Never generate a raw trap here; it might be a monitor instruction, that requires emulation. */
383	rc = VINF_EM_RAW_EMULATE_INSTR;
384
385	return trpmGCExitTrap(pVM, rc, pRegFrame);
386	}
387
388
389	/**
390	* Trap handler for device not present fault (\#NM).
391	*
392	* Device not available, FP or (F)WAIT instruction.
393	*
394	* @returns VBox status code.
395	* VINF_SUCCESS means we completely handled this trap,
396	* other codes are passed execution to host context.
397	*
398	* @param pTrpm Pointer to TRPM data (within VM).
399	* @param pRegFrame Pointer to the register frame for the trap.
400	* @internal
401	*/
402	DECLASM(int) TRPMGCTrap07Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
403	{
404	PVM pVM = TRPM2VM(pTrpm);
405
406	LogFlow(("TRPMTrap07HandlerGC: eip=%VGv\n", pRegFrame->eip));
407	return CPUMHandleLazyFPU(pVM);
408	}
409
410
411	/**
412	* \#NP ((segment) Not Present) handler.
413	*
414	* @returns VBox status code.
415	* VINF_SUCCESS means we completely handled this trap,
416	* other codes are passed execution to host context.
417	*
418	* @param pTrpm Pointer to TRPM data (within VM).
419	* @param pRegFrame Pointer to the register frame for the trap.
420	* @internal
421	*/
422	DECLASM(int) TRPMGCTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
423	{
424	LogFlow(("TRPMGCTrap0bHandler: eip=%VGv\n", pRegFrame->eip));
425	PVM pVM = TRPM2VM(pTrpm);
426
427	/*
428	* Try to detect instruction by opcode which caused trap.
429	* XXX note: this code may cause \#PF (trap e) or \#GP (trap d) while
430	* accessing user code. need to handle it somehow in future!
431	*/
432	uint8_t *pu8Code;
433	if (SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, (PRTGCPTR)&pu8Code) == VINF_SUCCESS)
434	{
435	/*
436	* First skip possible instruction prefixes, such as:
437	* OS, AS
438	* CS:, DS:, ES:, SS:, FS:, GS:
439	* REPE, REPNE
440	*
441	* note: Currently we supports only up to 4 prefixes per opcode, more
442	* prefixes (normally not used anyway) will cause trap d in guest.
443	* note: Instruction length in IA-32 may be up to 15 bytes, we dont
444	* check this issue, its too hard.
445	*/
446	for (unsigned i = 0; i < 4; i++)
447	{
448	if ( pu8Code[0] != 0xf2 /* REPNE/REPNZ */
449	&& pu8Code[0] != 0xf3 /* REP/REPE/REPZ */
450	&& pu8Code[0] != 0x2e /* CS: */
451	&& pu8Code[0] != 0x36 /* SS: */
452	&& pu8Code[0] != 0x3e /* DS: */
453	&& pu8Code[0] != 0x26 /* ES: */
454	&& pu8Code[0] != 0x64 /* FS: */
455	&& pu8Code[0] != 0x65 /* GS: */
456	&& pu8Code[0] != 0x66 /* OS */
457	&& pu8Code[0] != 0x67 /* AS */
458	)
459	break;
460	pu8Code++;
461	}
462
463	/*
464	* Detect right switch using a callgate.
465	*
466	* We recognize the following causes for the trap 0b:
467	* CALL FAR, CALL FAR []
468	* JMP FAR, JMP FAR []
469	* IRET (may cause a task switch)
470	*
471	* Note: we can't detect whether the trap was caused by a call to a
472	* callgate descriptor or it is a real trap 0b due to a bad selector.
473	* In both situations we'll pass execution to our recompiler so we don't
474	* have to worry.
475	* If we wanted to do better detection, we have set GDT entries to callgate
476	* descriptors pointing to our own handlers.
477	*/
478	/** @todo not sure about IRET, may generate Trap 0d (\#GP), NEED TO CHECK! */
479	if ( pu8Code[0] == 0x9a /* CALL FAR */
480	\|\| ( pu8Code[0] == 0xff /* CALL FAR [] */
481	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x18)
482	\|\| pu8Code[0] == 0xea /* JMP FAR */
483	\|\| ( pu8Code[0] == 0xff /* JMP FAR [] */
484	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x28)
485	\|\| pu8Code[0] == 0xcf /* IRET */
486	)
487	{
488	/*
489	* Got potential call to callgate.
490	* We simply return execution to the recompiler to do emulation
491	* starting from the instruction which caused the trap.
492	*/
493	pTrpm->uActiveVector = ~0;
494	return VINF_EM_RAW_RING_SWITCH;
495	}
496	}
497
498	/*
499	* Pass trap 0b as is to the recompiler in all other cases.
500	*/
501	return VINF_EM_RAW_GUEST_TRAP;
502	}
503
504
505	/**
506	* \#GP (General Protection Fault) handler for Ring-0 privileged instructions.
507	*
508	* @returns VBox status code.
509	* VINF_SUCCESS means we completely handled this trap,
510	* other codes are passed execution to host context.
511	*
512	* @param pVM The VM handle.
513	* @param pRegFrame Pointer to the register frame for the trap.
514	* @param pCpu The opcode info.
515	* @param PC The program counter corresponding to cs:eip in pRegFrame.
516	*/
517	static int trpmGCTrap0dHandlerRing0(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
518	{
519	int rc;
520
521	/*
522	* Try handle it here, if not return to HC and emulate/interpret it there.
523	*/
524	switch (pCpu->pCurInstr->opcode)
525	{
526	case OP_INT3:
527	/*
528	* Little hack to make the code below not fail
529	*/
530	pCpu->param1.flags = USE_IMMEDIATE8;
531	pCpu->param1.parval = 3;
532	/* fallthru */
533	case OP_INT:
534	{
535	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
536	Assert(!(PATMIsPatchGCAddr(pVM, PC)));
537	if (pCpu->param1.parval == 3)
538	{
539	/* Obsolete!! */
540	/* Int 3 replacement patch? */
541	if (PATMHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS)
542	{
543	AssertFailed();
544	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
545	}
546	}
547	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
548	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
549	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
550
551	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
552	pVM->trpm.s.fActiveSoftwareInterrupt = true;
553	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
554	}
555
556	#ifdef PATM_EMULATE_SYSENTER
557	case OP_SYSEXIT:
558	case OP_SYSRET:
559	rc = PATMSysCall(pVM, pRegFrame, pCpu);
560	return trpmGCExitTrap(pVM, rc, pRegFrame);
561	#endif
562
563	case OP_HLT:
564	/* If it's in patch code, defer to ring-3. */
565	if (PATMIsPatchGCAddr(pVM, PC))
566	break;
567
568	pRegFrame->eip += pCpu->opsize;
569	return trpmGCExitTrap(pVM, VINF_EM_HALT, pRegFrame);
570
571
572	/*
573	* These instructions are used by PATM and CASM for finding
574	* dangerous non-trapping instructions. Thus, since all
575	* scanning and patching is done in ring-3 we'll have to
576	* return to ring-3 on the first encounter of these instructions.
577	*/
578	case OP_MOV_CR:
579	case OP_MOV_DR:
580	/* We can safely emulate control/debug register move instructions in patched code. */
581	if ( !PATMIsPatchGCAddr(pVM, PC)
582	&& !CSAMIsKnownDangerousInstr(pVM, PC))
583	break;
584	case OP_INVLPG:
585	case OP_LLDT:
586	case OP_STI:
587	case OP_RDTSC:
588	{
589	uint32_t cbIgnored;
590	rc = EMInterpretInstructionCPU(pVM, pCpu, pRegFrame, PC, &cbIgnored);
591	if (VBOX_SUCCESS(rc))
592	pRegFrame->eip += pCpu->opsize;
593	else if (rc == VERR_EM_INTERPRETER)
594	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
595	return trpmGCExitTrap(pVM, rc, pRegFrame);
596	}
597	}
598
599	return trpmGCExitTrap(pVM, VINF_EM_RAW_EXCEPTION_PRIVILEGED, pRegFrame);
600	}
601
602
603	/**
604	* \#GP (General Protection Fault) handler for Ring-3.
605	*
606	* @returns VBox status code.
607	* VINF_SUCCESS means we completely handled this trap,
608	* other codes are passed execution to host context.
609	*
610	* @param pVM The VM handle.
611	* @param pRegFrame Pointer to the register frame for the trap.
612	* @param pCpu The opcode info.
613	* @param PC The program counter corresponding to cs:eip in pRegFrame.
614	*/
615	static int trpmGCTrap0dHandlerRing3(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
616	{
617	int rc;
618
619	Assert(!pRegFrame->eflags.Bits.u1VM);
620
621	switch (pCpu->pCurInstr->opcode)
622	{
623	/*
624	* STI and CLI are I/O privileged, i.e. if IOPL
625	*/
626	case OP_STI:
627	case OP_CLI:
628	{
629	uint32_t efl = CPUMRawGetEFlags(pVM, pRegFrame);
630	if (X86_EFL_GET_IOPL(efl) >= (unsigned)(pRegFrame->ss & X86_SEL_RPL))
631	{
632	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n"));
633	return trpmGCExitTrap(pVM, VINF_EM_RESCHEDULE_REM, pRegFrame);
634	}
635	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0)\n"));
636	break;
637	}
638
639	/*
640	* INT3 and INT xx are ring-switching.
641	* (The shadow IDT will have set the entries to DPL=0, that's why we're here.)
642	*/
643	case OP_INT3:
644	/*
645	* Little hack to make the code below not fail
646	*/
647	pCpu->param1.flags = USE_IMMEDIATE8;
648	pCpu->param1.parval = 3;
649	/* fall thru */
650	case OP_INT:
651	{
652	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
653	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
654	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
655	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
656
657	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
658	pVM->trpm.s.fActiveSoftwareInterrupt = true;
659	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
660	}
661
662	/*
663	* SYSCALL, SYSENTER, INTO and BOUND are also ring-switchers.
664	*/
665	case OP_SYSCALL:
666	case OP_SYSENTER:
667	#ifdef PATM_EMULATE_SYSENTER
668	rc = PATMSysCall(pVM, pRegFrame, pCpu);
669	if (rc == VINF_SUCCESS)
670	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
671	/* else no break; */
672	#endif
673	case OP_BOUND:
674	case OP_INTO:
675	pVM->trpm.s.uActiveVector = ~0;
676	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH, pRegFrame);
677
678	/*
679	* Handle virtualized TSC reads.
680	* (EMInterpretInstructionCPU isn't usable here because it rejects cpl != 0.)
681	*/
682	case OP_RDTSC:
683	{
684	/** @todo statistics */
685	if (CPUMGetGuestCR4(pVM) & X86_CR4_TSD)
686	rc = VINF_EM_RAW_EMULATE_INSTR;
687	else
688	{
689	uint64_t Tsc = TMCpuTickGet(pVM);
690	pRegFrame->eax = Tsc;
691	pRegFrame->edx = Tsc >> 32;
692	pRegFrame->eip += pCpu->opsize;
693	rc = VINF_SUCCESS;
694	}
695	return trpmGCExitTrap(pVM, rc, pRegFrame);
696	}
697	}
698
699	/*
700	* A genuine guest fault.
701	*/
702	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
703	}
704
705
706	/**
707	* \#GP (General Protection Fault) handler.
708	*
709	* @returns VBox status code.
710	* VINF_SUCCESS means we completely handled this trap,
711	* other codes are passed execution to host context.
712	*
713	* @param pVM The VM handle.
714	* @param pTrpm Pointer to TRPM data (within VM).
715	* @param pRegFrame Pointer to the register frame for the trap.
716	*/
717	static int trpmGCTrap0dHandler(PVM pVM, PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
718	{
719	LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%VGv uErr=%RX32\n", pRegFrame->ss, pRegFrame->eip, pTrpm->uActiveErrorCode));
720
721	#if 0 /* not right for iret. Shouldn't really be needed as SELMValidateAndConvertCSAddr deals with invalid cs. */
722	/*
723	* Filter out selector problems first as these may mean that the
724	* instruction isn't safe to read. If we're here because CS is NIL
725	* the flattening of cs:eip will deal with that.
726	*/
727	if ( !(pTrpm->uActiveErrorCode & (X86_TRAP_ERR_IDT \| X86_TRAP_ERR_EXTERNAL))
728	&& (pTrpm->uActiveErrorCode & X86_TRAP_ERR_SEL_MASK))
729	{
730	/* It's a guest trap. */
731	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
732	}
733	#endif
734
735	STAM_PROFILE_ADV_START(&pVM->trpm.s.StatTrap0dDisasm, a);
736	/*
737	* Decode the instruction.
738	*/
739	RTGCPTR PC;
740	int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
741	if (VBOX_FAILURE(rc))
742	{
743	Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n",
744	pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
745	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
746	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
747	}
748
749	DISCPUSTATE Cpu;
750	uint32_t cbOp;
751	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
752	if (VBOX_FAILURE(rc))
753	{
754	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
755	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
756	}
757	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
758
759	/*
760	* Deal with I/O port access.
761	*/
762	if ( pVM->trpm.s.uActiveErrorCode == 0
763	&& (Cpu.pCurInstr->optype & OPTYPE_PORTIO))
764	{
765	rc = EMInterpretPortIO(pVM, pRegFrame, &Cpu, cbOp);
766	return trpmGCExitTrap(pVM, rc, pRegFrame);
767	}
768
769
770	/*
771	* Deal with Ring-0 (privileged instructions)
772	*/
773	if ( (pRegFrame->ss & X86_SEL_RPL) <= 1
774	&& !pRegFrame->eflags.Bits.u1VM)
775	return trpmGCTrap0dHandlerRing0(pVM, pRegFrame, &Cpu, PC);
776
777	/*
778	* Deal with Ring-3 GPs.
779	*/
780	if (!pRegFrame->eflags.Bits.u1VM)
781	return trpmGCTrap0dHandlerRing3(pVM, pRegFrame, &Cpu, PC);
782
783	/*
784	* Deal with v86 code.
785	*/
786
787	/* 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.
788	* Simply fall back to the recompiler to emulate this instruction.
789	*/
790	/* Retrieve the eflags including the virtualized bits. */
791	/** @note hackish as the cpumctxcore structure doesn't contain the right value */
792	X86EFLAGS eflags;
793	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
794	if (eflags.Bits.u2IOPL != 3)
795	{
796	Assert(eflags.Bits.u2IOPL == 0);
797
798	int rc = TRPMForwardTrap(pVM, pRegFrame, 0xD, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
799	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
800	return trpmGCExitTrap(pVM, rc, pRegFrame);
801	}
802	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
803	}
804
805
806	/**
807	* \#GP (General Protection Fault) handler.
808	*
809	* @returns VBox status code.
810	* VINF_SUCCESS means we completely handled this trap,
811	* other codes are passed execution to host context.
812	*
813	* @param pTrpm Pointer to TRPM data (within VM).
814	* @param pRegFrame Pointer to the register frame for the trap.
815	* @internal
816	*/
817	DECLASM(int) TRPMGCTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
818	{
819	LogFlow(("TRPMGCTrap0dHandler: eip=%RGv\n", pRegFrame->eip));
820	PVM pVM = TRPM2VM(pTrpm);
821
822	int rc = trpmGCTrap0dHandler(pVM, pTrpm, pRegFrame);
823	switch (rc)
824	{
825	case VINF_EM_RAW_GUEST_TRAP:
826	case VINF_EM_RAW_EXCEPTION_PRIVILEGED:
827	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
828	rc = VINF_PATM_PATCH_TRAP_GP;
829	break;
830
831	case VINF_EM_RAW_INTERRUPT_PENDING:
832	Assert(TRPMHasTrap(pVM));
833	/* no break; */
834	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
835	case VINF_IOM_HC_IOPORT_READWRITE:
836	case VINF_IOM_HC_IOPORT_READ:
837	case VINF_IOM_HC_IOPORT_WRITE:
838	case VINF_IOM_HC_MMIO_WRITE:
839	case VINF_IOM_HC_MMIO_READ:
840	case VINF_IOM_HC_MMIO_READ_WRITE:
841	case VINF_PATM_PATCH_INT3:
842	case VINF_EM_RAW_TO_R3:
843	case VINF_EM_RAW_TIMER_PENDING:
844	case VINF_EM_PENDING_REQUEST:
845	case VINF_EM_HALT:
846	case VINF_SUCCESS:
847	break;
848
849	default:
850	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("return code %d\n", rc));
851	break;
852	}
853	return rc;
854	}
855
856	/**
857	* \#PF (Page Fault) handler.
858	*
859	* Calls PGM which does the actual handling.
860	*
861	*
862	* @returns VBox status code.
863	* VINF_SUCCESS means we completely handled this trap,
864	* other codes are passed execution to host context.
865	*
866	* @param pTrpm Pointer to TRPM data (within VM).
867	* @param pRegFrame Pointer to the register frame for the trap.
868	* @internal
869	*/
870	DECLASM(int) TRPMGCTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
871	{
872	LogBird(("TRPMGCTrap0eHandler: eip=%RGv\n", pRegFrame->eip));
873	PVM pVM = TRPM2VM(pTrpm);
874
875	/*
876	* This is all PGM stuff.
877	*/
878	int rc = PGMTrap0eHandler(pVM, pTrpm->uActiveErrorCode, pRegFrame, (RTGCPTR)pTrpm->uActiveCR2);
879
880	switch (rc)
881	{
882	case VINF_EM_RAW_EMULATE_INSTR:
883	case VINF_EM_RAW_EMULATE_INSTR_PD_FAULT:
884	case VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT:
885	case VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT:
886	case VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT:
887	case VINF_EM_RAW_EMULATE_INSTR_IDT_FAULT:
888	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
889	rc = VINF_PATCH_EMULATE_INSTR;
890	break;
891
892	case VINF_EM_RAW_GUEST_TRAP:
893	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
894	return VINF_PATM_PATCH_TRAP_PF;
895
896	rc = TRPMForwardTrap(pVM, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
897	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
898	break;
899
900	case VINF_EM_RAW_INTERRUPT_PENDING:
901	Assert(TRPMHasTrap(pVM));
902	/* no break; */
903	case VINF_IOM_HC_MMIO_READ:
904	case VINF_IOM_HC_MMIO_WRITE:
905	case VINF_IOM_HC_MMIO_READ_WRITE:
906	case VINF_PATM_HC_MMIO_PATCH_READ:
907	case VINF_PATM_HC_MMIO_PATCH_WRITE:
908	case VINF_SUCCESS:
909	case VINF_EM_RAW_TO_R3:
910	case VINF_EM_PENDING_REQUEST:
911	case VINF_EM_RAW_TIMER_PENDING:
912	case VINF_CSAM_PENDING_ACTION:
913	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
914	break;
915
916	default:
917	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip));
918	break;
919	}
920	return trpmGCExitTrap(pVM, rc, pRegFrame);
921	}
922
923
924	/**
925	* Scans for the EIP in the specified array of trap handlers.
926	*
927	* If we don't fine the EIP, we'll panic.
928	*
929	* @returns VBox status code.
930	*
931	* @param pVM The VM handle.
932	* @param pRegFrame Pointer to the register frame for the trap.
933	* @param paHandlers The array of trap handler records.
934	* @param pEndRecord The end record (exclusive).
935	*/
936	static int trpmGCHyperGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, PCTRPMGCHYPER paHandlers, PCTRPMGCHYPER pEndRecord)
937	{
938	uintptr_t uEip = (uintptr_t)pRegFrame->eip;
939	Assert(paHandlers <= pEndRecord);
940
941	Log(("trpmGCHyperGeneric: uEip=%x %p-%p\n", uEip, paHandlers, pEndRecord));
942
943	#if 0 /// @todo later
944	/*
945	* Start by doing a kind of binary search.
946	*/
947	unsigned iStart = 0;
948	unsigned iEnd = pEndRecord - paHandlers;
949	unsigned i = iEnd / 2;
950	#endif
951
952	/*
953	* Do a linear search now (in case the array wasn't properly sorted).
954	*/
955	for (PCTRPMGCHYPER pCur = paHandlers; pCur < pEndRecord; pCur++)
956	{
957	if ( pCur->uStartEIP <= uEip
958	&& (pCur->uEndEIP ? pCur->uEndEIP > uEip : pCur->uStartEIP == uEip))
959	return pCur->pfnHandler(pVM, pRegFrame, pCur->uUser);
960	}
961
962	return VERR_TRPM_DONT_PANIC;
963	}
964
965
966	/**
967	* Hypervisor \#NP ((segment) Not Present) handler.
968	*
969	* Scans for the EIP in the registered trap handlers.
970	*
971	* @returns VBox status code.
972	* VINF_SUCCESS means we completely handled this trap,
973	* other codes are passed back to host context.
974	*
975	* @param pTrpm Pointer to TRPM data (within VM).
976	* @param pRegFrame Pointer to the register frame for the trap.
977	* @internal
978	*/
979	DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
980	{
981	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0bHandlers, g_aTrap0bHandlersEnd);
982	}
983
984
985	/**
986	* Hypervisor \#GP (General Protection Fault) handler.
987	*
988	* Scans for the EIP in the registered trap handlers.
989	*
990	* @returns VBox status code.
991	* VINF_SUCCESS means we completely handled this trap,
992	* other codes are passed back to host context.
993	*
994	* @param pTrpm Pointer to TRPM data (within VM).
995	* @param pRegFrame Pointer to the register frame for the trap.
996	* @internal
997	*/
998	DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
999	{
1000	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1001	}
1002
1003
1004	/**
1005	* Hypervisor \#PF (Page Fault) handler.
1006	*
1007	* Scans for the EIP in the registered trap handlers.
1008	*
1009	* @returns VBox status code.
1010	* VINF_SUCCESS means we completely handled this trap,
1011	* other codes are passed back to host context.
1012	*
1013	* @param pTrpm Pointer to TRPM data (within VM).
1014	* @param pRegFrame Pointer to the register frame for the trap.
1015	* @internal
1016	*/
1017	DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
1018	{
1019	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1020	}
1021
1022
1023	/**
1024	* Deal with hypervisor traps occuring when resuming execution on a trap.
1025	*
1026	* @returns VBox status code.
1027	* @param pVM The VM handle.
1028	* @param pRegFrame Register frame.
1029	* @param uUser User arg.
1030	*/
1031	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
1032	{
1033	Log(("********************************************************\n"));
1034	Log(("trpmGCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
1035	Log(("********************************************************\n"));
1036
1037	if (uUser & TRPM_TRAP_IN_HYPER)
1038	{
1039	/*
1040	* Check that there is still some stack left, if not we'll flag
1041	* a guru meditation (the alternative is a triple fault).
1042	*/
1043	RTGCUINTPTR cbStackUsed = (RTGCUINTPTR)VMMGetStackGC(pVM) - pRegFrame->esp;
1044	if (cbStackUsed > VMM_STACK_SIZE - _1K)
1045	{
1046	LogRel(("trpmGCTrapInGeneric: ran out of stack: esp=#x cbStackUsed=%#x\n", pRegFrame->esp, cbStackUsed));
1047	return VERR_TRPM_DONT_PANIC;
1048	}
1049
1050	/*
1051	* Just zero the register containing the selector in question.
1052	* We'll deal with the actual stale or troublesome selector value in
1053	* the outermost trap frame.
1054	*/
1055	switch (uUser & TRPM_TRAP_IN_OP_MASK)
1056	{
1057	case TRPM_TRAP_IN_MOV_GS:
1058	pRegFrame->eax = 0;
1059	pRegFrame->gs = 0; /* prevent recursive trouble. */
1060	break;
1061	case TRPM_TRAP_IN_MOV_FS:
1062	pRegFrame->eax = 0;
1063	pRegFrame->fs = 0; /* prevent recursive trouble. */
1064	return VINF_SUCCESS;
1065
1066	default:
1067	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1068	return VERR_INTERNAL_ERROR;
1069	}
1070	}
1071	else
1072	{
1073	/*
1074	* Reconstruct the guest context and switch to the recompiler.
1075	* We ASSUME we're only at
1076	*/
1077	CPUMCTXCORE CtxCore = *pRegFrame;
1078	uint32_t pEsp = (uint32_t )pRegFrame->esp;
1079	int rc;
1080
1081	switch (uUser)
1082	{
1083	/*
1084	* This will only occur when resuming guest code in a trap handler!
1085	*/
1086	/* @note ASSUMES esp points to the temporary guest CPUMCTXCORE!!! */
1087	case TRPM_TRAP_IN_MOV_GS:
1088	case TRPM_TRAP_IN_MOV_FS:
1089	case TRPM_TRAP_IN_MOV_ES:
1090	case TRPM_TRAP_IN_MOV_DS:
1091	{
1092	PCPUMCTXCORE pTempGuestCtx = (PCPUMCTXCORE)pEsp;
1093
1094	/* Just copy the whole thing; several selector registers, eip (etc) and eax are not yet in pRegFrame. */
1095	CtxCore = *pTempGuestCtx;
1096	rc = VINF_EM_RAW_STALE_SELECTOR;
1097	break;
1098	}
1099
1100	/*
1101	* This will only occur when resuming guest code!
1102	*/
1103	case TRPM_TRAP_IN_IRET:
1104	CtxCore.eip = *pEsp++;
1105	CtxCore.cs = (RTSEL)*pEsp++;
1106	CtxCore.eflags.u32 = *pEsp++;
1107	CtxCore.esp = *pEsp++;
1108	CtxCore.ss = (RTSEL)*pEsp++;
1109	rc = VINF_EM_RAW_IRET_TRAP;
1110	break;
1111
1112	/*
1113	* This will only occur when resuming V86 guest code!
1114	*/
1115	case TRPM_TRAP_IN_IRET \| TRPM_TRAP_IN_V86:
1116	CtxCore.eip = *pEsp++;
1117	CtxCore.cs = (RTSEL)*pEsp++;
1118	CtxCore.eflags.u32 = *pEsp++;
1119	CtxCore.esp = *pEsp++;
1120	CtxCore.ss = (RTSEL)*pEsp++;
1121	CtxCore.es = (RTSEL)*pEsp++;
1122	CtxCore.ds = (RTSEL)*pEsp++;
1123	CtxCore.fs = (RTSEL)*pEsp++;
1124	CtxCore.gs = (RTSEL)*pEsp++;
1125	rc = VINF_EM_RAW_IRET_TRAP;
1126	break;
1127
1128	default:
1129	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1130	return VERR_INTERNAL_ERROR;
1131	}
1132
1133
1134	CPUMSetGuestCtxCore(pVM, &CtxCore);
1135	TRPMGCHyperReturnToHost(pVM, rc);
1136	}
1137
1138	AssertMsgFailed(("Impossible!\n"));
1139	return VERR_INTERNAL_ERROR;
1140	}
1141

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source: vbox/trunk/src/VBox/VMM/VMMGC/TRPMGCHandlers.cpp@ 1995

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