TRPMGCHandlers.cpp@ 2009

Last change on this file since 2009 was 2003, checked in by vboxsync, 18 years ago
Emulate monitor in ring 0.
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File size: 40.0 KB

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1	/* $Id: TRPMGCHandlers.cpp 2003 2007-04-10 09:30:52Z 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 (CPUMGetGuestCPL(pVM, pRegFrame) == 0)
346	{
347	/*
348	* Decode the instruction.
349	*/
350	RTGCPTR PC;
351	rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
352	if (VBOX_FAILURE(rc))
353	{
354	Log(("TRPMGCTrap06Handler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
355	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
356	}
357
358	DISCPUSTATE Cpu;
359	uint32_t cbOp;
360	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
361	if (VBOX_FAILURE(rc))
362	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
363
364	if ( PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)
365	&& Cpu.pCurInstr->opcode == OP_ILLUD2)
366	{
367	rc = PATMGCHandleIllegalInstrTrap(pVM, pRegFrame);
368	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)
369	return trpmGCExitTrap(pVM, rc, pRegFrame);
370	}
371	else
372	/** Note: monitor causes an #UD exception instead of #GP when not executed in ring 0. */
373	if (Cpu.pCurInstr->opcode == OP_MONITOR)
374	{
375	uint32_t cbIgnored;
376	rc = EMInterpretInstructionCPU(pVM, &Cpu, pRegFrame, PC, &cbIgnored);
377	}
378	else
379	/* Never generate a raw trap here; it might be an instruction, that requires emulation. */
380	rc = VINF_EM_RAW_EMULATE_INSTR;
381	}
382	else
383	if (pRegFrame->eflags.Bits.u1VM)
384	{
385	rc = TRPMForwardTrap(pVM, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP);
386	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
387	}
388	else
389	/* Never generate a raw trap here; it might be an instruction, that requires emulation. */
390	rc = VINF_EM_RAW_EMULATE_INSTR;
391
392	return trpmGCExitTrap(pVM, rc, pRegFrame);
393	}
394
395
396	/**
397	* Trap handler for device not present fault (\#NM).
398	*
399	* Device not available, FP or (F)WAIT instruction.
400	*
401	* @returns VBox status code.
402	* VINF_SUCCESS means we completely handled this trap,
403	* other codes are passed execution to host context.
404	*
405	* @param pTrpm Pointer to TRPM data (within VM).
406	* @param pRegFrame Pointer to the register frame for the trap.
407	* @internal
408	*/
409	DECLASM(int) TRPMGCTrap07Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
410	{
411	PVM pVM = TRPM2VM(pTrpm);
412
413	LogFlow(("TRPMTrap07HandlerGC: eip=%VGv\n", pRegFrame->eip));
414	return CPUMHandleLazyFPU(pVM);
415	}
416
417
418	/**
419	* \#NP ((segment) Not Present) handler.
420	*
421	* @returns VBox status code.
422	* VINF_SUCCESS means we completely handled this trap,
423	* other codes are passed execution to host context.
424	*
425	* @param pTrpm Pointer to TRPM data (within VM).
426	* @param pRegFrame Pointer to the register frame for the trap.
427	* @internal
428	*/
429	DECLASM(int) TRPMGCTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
430	{
431	LogFlow(("TRPMGCTrap0bHandler: eip=%VGv\n", pRegFrame->eip));
432	PVM pVM = TRPM2VM(pTrpm);
433
434	/*
435	* Try to detect instruction by opcode which caused trap.
436	* XXX note: this code may cause \#PF (trap e) or \#GP (trap d) while
437	* accessing user code. need to handle it somehow in future!
438	*/
439	uint8_t *pu8Code;
440	if (SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, (PRTGCPTR)&pu8Code) == VINF_SUCCESS)
441	{
442	/*
443	* First skip possible instruction prefixes, such as:
444	* OS, AS
445	* CS:, DS:, ES:, SS:, FS:, GS:
446	* REPE, REPNE
447	*
448	* note: Currently we supports only up to 4 prefixes per opcode, more
449	* prefixes (normally not used anyway) will cause trap d in guest.
450	* note: Instruction length in IA-32 may be up to 15 bytes, we dont
451	* check this issue, its too hard.
452	*/
453	for (unsigned i = 0; i < 4; i++)
454	{
455	if ( pu8Code[0] != 0xf2 /* REPNE/REPNZ */
456	&& pu8Code[0] != 0xf3 /* REP/REPE/REPZ */
457	&& pu8Code[0] != 0x2e /* CS: */
458	&& pu8Code[0] != 0x36 /* SS: */
459	&& pu8Code[0] != 0x3e /* DS: */
460	&& pu8Code[0] != 0x26 /* ES: */
461	&& pu8Code[0] != 0x64 /* FS: */
462	&& pu8Code[0] != 0x65 /* GS: */
463	&& pu8Code[0] != 0x66 /* OS */
464	&& pu8Code[0] != 0x67 /* AS */
465	)
466	break;
467	pu8Code++;
468	}
469
470	/*
471	* Detect right switch using a callgate.
472	*
473	* We recognize the following causes for the trap 0b:
474	* CALL FAR, CALL FAR []
475	* JMP FAR, JMP FAR []
476	* IRET (may cause a task switch)
477	*
478	* Note: we can't detect whether the trap was caused by a call to a
479	* callgate descriptor or it is a real trap 0b due to a bad selector.
480	* In both situations we'll pass execution to our recompiler so we don't
481	* have to worry.
482	* If we wanted to do better detection, we have set GDT entries to callgate
483	* descriptors pointing to our own handlers.
484	*/
485	/** @todo not sure about IRET, may generate Trap 0d (\#GP), NEED TO CHECK! */
486	if ( pu8Code[0] == 0x9a /* CALL FAR */
487	\|\| ( pu8Code[0] == 0xff /* CALL FAR [] */
488	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x18)
489	\|\| pu8Code[0] == 0xea /* JMP FAR */
490	\|\| ( pu8Code[0] == 0xff /* JMP FAR [] */
491	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x28)
492	\|\| pu8Code[0] == 0xcf /* IRET */
493	)
494	{
495	/*
496	* Got potential call to callgate.
497	* We simply return execution to the recompiler to do emulation
498	* starting from the instruction which caused the trap.
499	*/
500	pTrpm->uActiveVector = ~0;
501	return VINF_EM_RAW_RING_SWITCH;
502	}
503	}
504
505	/*
506	* Pass trap 0b as is to the recompiler in all other cases.
507	*/
508	return VINF_EM_RAW_GUEST_TRAP;
509	}
510
511
512	/**
513	* \#GP (General Protection Fault) handler for Ring-0 privileged instructions.
514	*
515	* @returns VBox status code.
516	* VINF_SUCCESS means we completely handled this trap,
517	* other codes are passed execution to host context.
518	*
519	* @param pVM The VM handle.
520	* @param pRegFrame Pointer to the register frame for the trap.
521	* @param pCpu The opcode info.
522	* @param PC The program counter corresponding to cs:eip in pRegFrame.
523	*/
524	static int trpmGCTrap0dHandlerRing0(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
525	{
526	int rc;
527
528	/*
529	* Try handle it here, if not return to HC and emulate/interpret it there.
530	*/
531	switch (pCpu->pCurInstr->opcode)
532	{
533	case OP_INT3:
534	/*
535	* Little hack to make the code below not fail
536	*/
537	pCpu->param1.flags = USE_IMMEDIATE8;
538	pCpu->param1.parval = 3;
539	/* fallthru */
540	case OP_INT:
541	{
542	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
543	Assert(!(PATMIsPatchGCAddr(pVM, PC)));
544	if (pCpu->param1.parval == 3)
545	{
546	/* Obsolete!! */
547	/* Int 3 replacement patch? */
548	if (PATMHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS)
549	{
550	AssertFailed();
551	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
552	}
553	}
554	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
555	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
556	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
557
558	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
559	pVM->trpm.s.fActiveSoftwareInterrupt = true;
560	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
561	}
562
563	#ifdef PATM_EMULATE_SYSENTER
564	case OP_SYSEXIT:
565	case OP_SYSRET:
566	rc = PATMSysCall(pVM, pRegFrame, pCpu);
567	return trpmGCExitTrap(pVM, rc, pRegFrame);
568	#endif
569
570	case OP_HLT:
571	/* If it's in patch code, defer to ring-3. */
572	if (PATMIsPatchGCAddr(pVM, PC))
573	break;
574
575	pRegFrame->eip += pCpu->opsize;
576	return trpmGCExitTrap(pVM, VINF_EM_HALT, pRegFrame);
577
578
579	/*
580	* These instructions are used by PATM and CASM for finding
581	* dangerous non-trapping instructions. Thus, since all
582	* scanning and patching is done in ring-3 we'll have to
583	* return to ring-3 on the first encounter of these instructions.
584	*/
585	case OP_MOV_CR:
586	case OP_MOV_DR:
587	/* We can safely emulate control/debug register move instructions in patched code. */
588	if ( !PATMIsPatchGCAddr(pVM, PC)
589	&& !CSAMIsKnownDangerousInstr(pVM, PC))
590	break;
591	case OP_INVLPG:
592	case OP_LLDT:
593	case OP_STI:
594	case OP_RDTSC:
595	{
596	uint32_t cbIgnored;
597	rc = EMInterpretInstructionCPU(pVM, pCpu, pRegFrame, PC, &cbIgnored);
598	if (VBOX_SUCCESS(rc))
599	pRegFrame->eip += pCpu->opsize;
600	else if (rc == VERR_EM_INTERPRETER)
601	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
602	return trpmGCExitTrap(pVM, rc, pRegFrame);
603	}
604	}
605
606	return trpmGCExitTrap(pVM, VINF_EM_RAW_EXCEPTION_PRIVILEGED, pRegFrame);
607	}
608
609
610	/**
611	* \#GP (General Protection Fault) handler for Ring-3.
612	*
613	* @returns VBox status code.
614	* VINF_SUCCESS means we completely handled this trap,
615	* other codes are passed execution to host context.
616	*
617	* @param pVM The VM handle.
618	* @param pRegFrame Pointer to the register frame for the trap.
619	* @param pCpu The opcode info.
620	* @param PC The program counter corresponding to cs:eip in pRegFrame.
621	*/
622	static int trpmGCTrap0dHandlerRing3(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
623	{
624	int rc;
625
626	Assert(!pRegFrame->eflags.Bits.u1VM);
627
628	switch (pCpu->pCurInstr->opcode)
629	{
630	/*
631	* STI and CLI are I/O privileged, i.e. if IOPL
632	*/
633	case OP_STI:
634	case OP_CLI:
635	{
636	uint32_t efl = CPUMRawGetEFlags(pVM, pRegFrame);
637	if (X86_EFL_GET_IOPL(efl) >= (unsigned)(pRegFrame->ss & X86_SEL_RPL))
638	{
639	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n"));
640	return trpmGCExitTrap(pVM, VINF_EM_RESCHEDULE_REM, pRegFrame);
641	}
642	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0)\n"));
643	break;
644	}
645
646	/*
647	* INT3 and INT xx are ring-switching.
648	* (The shadow IDT will have set the entries to DPL=0, that's why we're here.)
649	*/
650	case OP_INT3:
651	/*
652	* Little hack to make the code below not fail
653	*/
654	pCpu->param1.flags = USE_IMMEDIATE8;
655	pCpu->param1.parval = 3;
656	/* fall thru */
657	case OP_INT:
658	{
659	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
660	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
661	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
662	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
663
664	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
665	pVM->trpm.s.fActiveSoftwareInterrupt = true;
666	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
667	}
668
669	/*
670	* SYSCALL, SYSENTER, INTO and BOUND are also ring-switchers.
671	*/
672	case OP_SYSCALL:
673	case OP_SYSENTER:
674	#ifdef PATM_EMULATE_SYSENTER
675	rc = PATMSysCall(pVM, pRegFrame, pCpu);
676	if (rc == VINF_SUCCESS)
677	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
678	/* else no break; */
679	#endif
680	case OP_BOUND:
681	case OP_INTO:
682	pVM->trpm.s.uActiveVector = ~0;
683	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH, pRegFrame);
684
685	/*
686	* Handle virtualized TSC reads.
687	* (EMInterpretInstructionCPU isn't usable here because it rejects cpl != 0.)
688	*/
689	case OP_RDTSC:
690	{
691	/** @todo statistics */
692	if (CPUMGetGuestCR4(pVM) & X86_CR4_TSD)
693	rc = VINF_EM_RAW_EMULATE_INSTR;
694	else
695	{
696	uint64_t Tsc = TMCpuTickGet(pVM);
697	pRegFrame->eax = Tsc;
698	pRegFrame->edx = Tsc >> 32;
699	pRegFrame->eip += pCpu->opsize;
700	rc = VINF_SUCCESS;
701	}
702	return trpmGCExitTrap(pVM, rc, pRegFrame);
703	}
704	}
705
706	/*
707	* A genuine guest fault.
708	*/
709	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
710	}
711
712
713	/**
714	* \#GP (General Protection Fault) handler.
715	*
716	* @returns VBox status code.
717	* VINF_SUCCESS means we completely handled this trap,
718	* other codes are passed execution to host context.
719	*
720	* @param pVM The VM handle.
721	* @param pTrpm Pointer to TRPM data (within VM).
722	* @param pRegFrame Pointer to the register frame for the trap.
723	*/
724	static int trpmGCTrap0dHandler(PVM pVM, PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
725	{
726	LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%VGv uErr=%RX32\n", pRegFrame->ss, pRegFrame->eip, pTrpm->uActiveErrorCode));
727
728	#if 0 /* not right for iret. Shouldn't really be needed as SELMValidateAndConvertCSAddr deals with invalid cs. */
729	/*
730	* Filter out selector problems first as these may mean that the
731	* instruction isn't safe to read. If we're here because CS is NIL
732	* the flattening of cs:eip will deal with that.
733	*/
734	if ( !(pTrpm->uActiveErrorCode & (X86_TRAP_ERR_IDT \| X86_TRAP_ERR_EXTERNAL))
735	&& (pTrpm->uActiveErrorCode & X86_TRAP_ERR_SEL_MASK))
736	{
737	/* It's a guest trap. */
738	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
739	}
740	#endif
741
742	STAM_PROFILE_ADV_START(&pVM->trpm.s.StatTrap0dDisasm, a);
743	/*
744	* Decode the instruction.
745	*/
746	RTGCPTR PC;
747	int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
748	if (VBOX_FAILURE(rc))
749	{
750	Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n",
751	pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
752	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
753	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
754	}
755
756	DISCPUSTATE Cpu;
757	uint32_t cbOp;
758	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
759	if (VBOX_FAILURE(rc))
760	{
761	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
762	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
763	}
764	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
765
766	/*
767	* Deal with I/O port access.
768	*/
769	if ( pVM->trpm.s.uActiveErrorCode == 0
770	&& (Cpu.pCurInstr->optype & OPTYPE_PORTIO))
771	{
772	rc = EMInterpretPortIO(pVM, pRegFrame, &Cpu, cbOp);
773	return trpmGCExitTrap(pVM, rc, pRegFrame);
774	}
775
776
777	/*
778	* Deal with Ring-0 (privileged instructions)
779	*/
780	if ( (pRegFrame->ss & X86_SEL_RPL) <= 1
781	&& !pRegFrame->eflags.Bits.u1VM)
782	return trpmGCTrap0dHandlerRing0(pVM, pRegFrame, &Cpu, PC);
783
784	/*
785	* Deal with Ring-3 GPs.
786	*/
787	if (!pRegFrame->eflags.Bits.u1VM)
788	return trpmGCTrap0dHandlerRing3(pVM, pRegFrame, &Cpu, PC);
789
790	/*
791	* Deal with v86 code.
792	*/
793
794	/* 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.
795	* Simply fall back to the recompiler to emulate this instruction.
796	*/
797	/* Retrieve the eflags including the virtualized bits. */
798	/** @note hackish as the cpumctxcore structure doesn't contain the right value */
799	X86EFLAGS eflags;
800	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
801	if (eflags.Bits.u2IOPL != 3)
802	{
803	Assert(eflags.Bits.u2IOPL == 0);
804
805	int rc = TRPMForwardTrap(pVM, pRegFrame, 0xD, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
806	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
807	return trpmGCExitTrap(pVM, rc, pRegFrame);
808	}
809	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
810	}
811
812
813	/**
814	* \#GP (General Protection Fault) handler.
815	*
816	* @returns VBox status code.
817	* VINF_SUCCESS means we completely handled this trap,
818	* other codes are passed execution to host context.
819	*
820	* @param pTrpm Pointer to TRPM data (within VM).
821	* @param pRegFrame Pointer to the register frame for the trap.
822	* @internal
823	*/
824	DECLASM(int) TRPMGCTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
825	{
826	LogFlow(("TRPMGCTrap0dHandler: eip=%RGv\n", pRegFrame->eip));
827	PVM pVM = TRPM2VM(pTrpm);
828
829	int rc = trpmGCTrap0dHandler(pVM, pTrpm, pRegFrame);
830	switch (rc)
831	{
832	case VINF_EM_RAW_GUEST_TRAP:
833	case VINF_EM_RAW_EXCEPTION_PRIVILEGED:
834	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
835	rc = VINF_PATM_PATCH_TRAP_GP;
836	break;
837
838	case VINF_EM_RAW_INTERRUPT_PENDING:
839	Assert(TRPMHasTrap(pVM));
840	/* no break; */
841	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
842	case VINF_IOM_HC_IOPORT_READWRITE:
843	case VINF_IOM_HC_IOPORT_READ:
844	case VINF_IOM_HC_IOPORT_WRITE:
845	case VINF_IOM_HC_MMIO_WRITE:
846	case VINF_IOM_HC_MMIO_READ:
847	case VINF_IOM_HC_MMIO_READ_WRITE:
848	case VINF_PATM_PATCH_INT3:
849	case VINF_EM_RAW_TO_R3:
850	case VINF_EM_RAW_TIMER_PENDING:
851	case VINF_EM_PENDING_REQUEST:
852	case VINF_EM_HALT:
853	case VINF_SUCCESS:
854	break;
855
856	default:
857	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("return code %d\n", rc));
858	break;
859	}
860	return rc;
861	}
862
863	/**
864	* \#PF (Page Fault) handler.
865	*
866	* Calls PGM which does the actual handling.
867	*
868	*
869	* @returns VBox status code.
870	* VINF_SUCCESS means we completely handled this trap,
871	* other codes are passed execution to host context.
872	*
873	* @param pTrpm Pointer to TRPM data (within VM).
874	* @param pRegFrame Pointer to the register frame for the trap.
875	* @internal
876	*/
877	DECLASM(int) TRPMGCTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
878	{
879	LogBird(("TRPMGCTrap0eHandler: eip=%RGv\n", pRegFrame->eip));
880	PVM pVM = TRPM2VM(pTrpm);
881
882	/*
883	* This is all PGM stuff.
884	*/
885	int rc = PGMTrap0eHandler(pVM, pTrpm->uActiveErrorCode, pRegFrame, (RTGCPTR)pTrpm->uActiveCR2);
886
887	switch (rc)
888	{
889	case VINF_EM_RAW_EMULATE_INSTR:
890	case VINF_EM_RAW_EMULATE_INSTR_PD_FAULT:
891	case VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT:
892	case VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT:
893	case VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT:
894	case VINF_EM_RAW_EMULATE_INSTR_IDT_FAULT:
895	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
896	rc = VINF_PATCH_EMULATE_INSTR;
897	break;
898
899	case VINF_EM_RAW_GUEST_TRAP:
900	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
901	return VINF_PATM_PATCH_TRAP_PF;
902
903	rc = TRPMForwardTrap(pVM, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
904	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
905	break;
906
907	case VINF_EM_RAW_INTERRUPT_PENDING:
908	Assert(TRPMHasTrap(pVM));
909	/* no break; */
910	case VINF_IOM_HC_MMIO_READ:
911	case VINF_IOM_HC_MMIO_WRITE:
912	case VINF_IOM_HC_MMIO_READ_WRITE:
913	case VINF_PATM_HC_MMIO_PATCH_READ:
914	case VINF_PATM_HC_MMIO_PATCH_WRITE:
915	case VINF_SUCCESS:
916	case VINF_EM_RAW_TO_R3:
917	case VINF_EM_PENDING_REQUEST:
918	case VINF_EM_RAW_TIMER_PENDING:
919	case VINF_CSAM_PENDING_ACTION:
920	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
921	break;
922
923	default:
924	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip));
925	break;
926	}
927	return trpmGCExitTrap(pVM, rc, pRegFrame);
928	}
929
930
931	/**
932	* Scans for the EIP in the specified array of trap handlers.
933	*
934	* If we don't fine the EIP, we'll panic.
935	*
936	* @returns VBox status code.
937	*
938	* @param pVM The VM handle.
939	* @param pRegFrame Pointer to the register frame for the trap.
940	* @param paHandlers The array of trap handler records.
941	* @param pEndRecord The end record (exclusive).
942	*/
943	static int trpmGCHyperGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, PCTRPMGCHYPER paHandlers, PCTRPMGCHYPER pEndRecord)
944	{
945	uintptr_t uEip = (uintptr_t)pRegFrame->eip;
946	Assert(paHandlers <= pEndRecord);
947
948	Log(("trpmGCHyperGeneric: uEip=%x %p-%p\n", uEip, paHandlers, pEndRecord));
949
950	#if 0 /// @todo later
951	/*
952	* Start by doing a kind of binary search.
953	*/
954	unsigned iStart = 0;
955	unsigned iEnd = pEndRecord - paHandlers;
956	unsigned i = iEnd / 2;
957	#endif
958
959	/*
960	* Do a linear search now (in case the array wasn't properly sorted).
961	*/
962	for (PCTRPMGCHYPER pCur = paHandlers; pCur < pEndRecord; pCur++)
963	{
964	if ( pCur->uStartEIP <= uEip
965	&& (pCur->uEndEIP ? pCur->uEndEIP > uEip : pCur->uStartEIP == uEip))
966	return pCur->pfnHandler(pVM, pRegFrame, pCur->uUser);
967	}
968
969	return VERR_TRPM_DONT_PANIC;
970	}
971
972
973	/**
974	* Hypervisor \#NP ((segment) Not Present) handler.
975	*
976	* Scans for the EIP in the registered trap handlers.
977	*
978	* @returns VBox status code.
979	* VINF_SUCCESS means we completely handled this trap,
980	* other codes are passed back to host context.
981	*
982	* @param pTrpm Pointer to TRPM data (within VM).
983	* @param pRegFrame Pointer to the register frame for the trap.
984	* @internal
985	*/
986	DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
987	{
988	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0bHandlers, g_aTrap0bHandlersEnd);
989	}
990
991
992	/**
993	* Hypervisor \#GP (General Protection Fault) handler.
994	*
995	* Scans for the EIP in the registered trap handlers.
996	*
997	* @returns VBox status code.
998	* VINF_SUCCESS means we completely handled this trap,
999	* other codes are passed back to host context.
1000	*
1001	* @param pTrpm Pointer to TRPM data (within VM).
1002	* @param pRegFrame Pointer to the register frame for the trap.
1003	* @internal
1004	*/
1005	DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
1006	{
1007	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1008	}
1009
1010
1011	/**
1012	* Hypervisor \#PF (Page Fault) handler.
1013	*
1014	* Scans for the EIP in the registered trap handlers.
1015	*
1016	* @returns VBox status code.
1017	* VINF_SUCCESS means we completely handled this trap,
1018	* other codes are passed back to host context.
1019	*
1020	* @param pTrpm Pointer to TRPM data (within VM).
1021	* @param pRegFrame Pointer to the register frame for the trap.
1022	* @internal
1023	*/
1024	DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
1025	{
1026	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1027	}
1028
1029
1030	/**
1031	* Deal with hypervisor traps occuring when resuming execution on a trap.
1032	*
1033	* @returns VBox status code.
1034	* @param pVM The VM handle.
1035	* @param pRegFrame Register frame.
1036	* @param uUser User arg.
1037	*/
1038	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
1039	{
1040	Log(("********************************************************\n"));
1041	Log(("trpmGCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
1042	Log(("********************************************************\n"));
1043
1044	if (uUser & TRPM_TRAP_IN_HYPER)
1045	{
1046	/*
1047	* Check that there is still some stack left, if not we'll flag
1048	* a guru meditation (the alternative is a triple fault).
1049	*/
1050	RTGCUINTPTR cbStackUsed = (RTGCUINTPTR)VMMGetStackGC(pVM) - pRegFrame->esp;
1051	if (cbStackUsed > VMM_STACK_SIZE - _1K)
1052	{
1053	LogRel(("trpmGCTrapInGeneric: ran out of stack: esp=#x cbStackUsed=%#x\n", pRegFrame->esp, cbStackUsed));
1054	return VERR_TRPM_DONT_PANIC;
1055	}
1056
1057	/*
1058	* Just zero the register containing the selector in question.
1059	* We'll deal with the actual stale or troublesome selector value in
1060	* the outermost trap frame.
1061	*/
1062	switch (uUser & TRPM_TRAP_IN_OP_MASK)
1063	{
1064	case TRPM_TRAP_IN_MOV_GS:
1065	pRegFrame->eax = 0;
1066	pRegFrame->gs = 0; /* prevent recursive trouble. */
1067	break;
1068	case TRPM_TRAP_IN_MOV_FS:
1069	pRegFrame->eax = 0;
1070	pRegFrame->fs = 0; /* prevent recursive trouble. */
1071	return VINF_SUCCESS;
1072
1073	default:
1074	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1075	return VERR_INTERNAL_ERROR;
1076	}
1077	}
1078	else
1079	{
1080	/*
1081	* Reconstruct the guest context and switch to the recompiler.
1082	* We ASSUME we're only at
1083	*/
1084	CPUMCTXCORE CtxCore = *pRegFrame;
1085	uint32_t pEsp = (uint32_t )pRegFrame->esp;
1086	int rc;
1087
1088	switch (uUser)
1089	{
1090	/*
1091	* This will only occur when resuming guest code in a trap handler!
1092	*/
1093	/* @note ASSUMES esp points to the temporary guest CPUMCTXCORE!!! */
1094	case TRPM_TRAP_IN_MOV_GS:
1095	case TRPM_TRAP_IN_MOV_FS:
1096	case TRPM_TRAP_IN_MOV_ES:
1097	case TRPM_TRAP_IN_MOV_DS:
1098	{
1099	PCPUMCTXCORE pTempGuestCtx = (PCPUMCTXCORE)pEsp;
1100
1101	/* Just copy the whole thing; several selector registers, eip (etc) and eax are not yet in pRegFrame. */
1102	CtxCore = *pTempGuestCtx;
1103	rc = VINF_EM_RAW_STALE_SELECTOR;
1104	break;
1105	}
1106
1107	/*
1108	* This will only occur when resuming guest code!
1109	*/
1110	case TRPM_TRAP_IN_IRET:
1111	CtxCore.eip = *pEsp++;
1112	CtxCore.cs = (RTSEL)*pEsp++;
1113	CtxCore.eflags.u32 = *pEsp++;
1114	CtxCore.esp = *pEsp++;
1115	CtxCore.ss = (RTSEL)*pEsp++;
1116	rc = VINF_EM_RAW_IRET_TRAP;
1117	break;
1118
1119	/*
1120	* This will only occur when resuming V86 guest code!
1121	*/
1122	case TRPM_TRAP_IN_IRET \| TRPM_TRAP_IN_V86:
1123	CtxCore.eip = *pEsp++;
1124	CtxCore.cs = (RTSEL)*pEsp++;
1125	CtxCore.eflags.u32 = *pEsp++;
1126	CtxCore.esp = *pEsp++;
1127	CtxCore.ss = (RTSEL)*pEsp++;
1128	CtxCore.es = (RTSEL)*pEsp++;
1129	CtxCore.ds = (RTSEL)*pEsp++;
1130	CtxCore.fs = (RTSEL)*pEsp++;
1131	CtxCore.gs = (RTSEL)*pEsp++;
1132	rc = VINF_EM_RAW_IRET_TRAP;
1133	break;
1134
1135	default:
1136	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1137	return VERR_INTERNAL_ERROR;
1138	}
1139
1140
1141	CPUMSetGuestCtxCore(pVM, &CtxCore);
1142	TRPMGCHyperReturnToHost(pVM, rc);
1143	}
1144
1145	AssertMsgFailed(("Impossible!\n"));
1146	return VERR_INTERNAL_ERROR;
1147	}
1148

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source: vbox/trunk/src/VBox/VMM/VMMGC/TRPMGCHandlers.cpp@ 2009

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