TRPMGCHandlers.cpp@ 2095

Last change on this file since 2095 was 2066, checked in by vboxsync, 18 years ago
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1	/* $Id: TRPMGCHandlers.cpp 2066 2007-04-13 09:05:03Z 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	if (RT_LIKELY(VBOX_SUCCESS(rc)))
378	pRegFrame->eip += Cpu.opsize;
379	}
380	else
381	/* Never generate a raw trap here; it might be an instruction, that requires emulation. */
382	rc = VINF_EM_RAW_EMULATE_INSTR;
383	}
384	else
385	if (pRegFrame->eflags.Bits.u1VM)
386	{
387	rc = TRPMForwardTrap(pVM, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP);
388	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
389	}
390	else
391	/* Never generate a raw trap here; it might be an instruction, that requires emulation. */
392	rc = VINF_EM_RAW_EMULATE_INSTR;
393
394	return trpmGCExitTrap(pVM, rc, pRegFrame);
395	}
396
397
398	/**
399	* Trap handler for device not present fault (\#NM).
400	*
401	* Device not available, FP or (F)WAIT instruction.
402	*
403	* @returns VBox status code.
404	* VINF_SUCCESS means we completely handled this trap,
405	* other codes are passed execution to host context.
406	*
407	* @param pTrpm Pointer to TRPM data (within VM).
408	* @param pRegFrame Pointer to the register frame for the trap.
409	* @internal
410	*/
411	DECLASM(int) TRPMGCTrap07Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
412	{
413	PVM pVM = TRPM2VM(pTrpm);
414
415	LogFlow(("TRPMTrap07HandlerGC: eip=%VGv\n", pRegFrame->eip));
416	return CPUMHandleLazyFPU(pVM);
417	}
418
419
420	/**
421	* \#NP ((segment) Not Present) handler.
422	*
423	* @returns VBox status code.
424	* VINF_SUCCESS means we completely handled this trap,
425	* other codes are passed execution to host context.
426	*
427	* @param pTrpm Pointer to TRPM data (within VM).
428	* @param pRegFrame Pointer to the register frame for the trap.
429	* @internal
430	*/
431	DECLASM(int) TRPMGCTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
432	{
433	LogFlow(("TRPMGCTrap0bHandler: eip=%VGv\n", pRegFrame->eip));
434	PVM pVM = TRPM2VM(pTrpm);
435
436	/*
437	* Try to detect instruction by opcode which caused trap.
438	* XXX note: this code may cause \#PF (trap e) or \#GP (trap d) while
439	* accessing user code. need to handle it somehow in future!
440	*/
441	uint8_t *pu8Code;
442	if (SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, (PRTGCPTR)&pu8Code) == VINF_SUCCESS)
443	{
444	/*
445	* First skip possible instruction prefixes, such as:
446	* OS, AS
447	* CS:, DS:, ES:, SS:, FS:, GS:
448	* REPE, REPNE
449	*
450	* note: Currently we supports only up to 4 prefixes per opcode, more
451	* prefixes (normally not used anyway) will cause trap d in guest.
452	* note: Instruction length in IA-32 may be up to 15 bytes, we dont
453	* check this issue, its too hard.
454	*/
455	for (unsigned i = 0; i < 4; i++)
456	{
457	if ( pu8Code[0] != 0xf2 /* REPNE/REPNZ */
458	&& pu8Code[0] != 0xf3 /* REP/REPE/REPZ */
459	&& pu8Code[0] != 0x2e /* CS: */
460	&& pu8Code[0] != 0x36 /* SS: */
461	&& pu8Code[0] != 0x3e /* DS: */
462	&& pu8Code[0] != 0x26 /* ES: */
463	&& pu8Code[0] != 0x64 /* FS: */
464	&& pu8Code[0] != 0x65 /* GS: */
465	&& pu8Code[0] != 0x66 /* OS */
466	&& pu8Code[0] != 0x67 /* AS */
467	)
468	break;
469	pu8Code++;
470	}
471
472	/*
473	* Detect right switch using a callgate.
474	*
475	* We recognize the following causes for the trap 0b:
476	* CALL FAR, CALL FAR []
477	* JMP FAR, JMP FAR []
478	* IRET (may cause a task switch)
479	*
480	* Note: we can't detect whether the trap was caused by a call to a
481	* callgate descriptor or it is a real trap 0b due to a bad selector.
482	* In both situations we'll pass execution to our recompiler so we don't
483	* have to worry.
484	* If we wanted to do better detection, we have set GDT entries to callgate
485	* descriptors pointing to our own handlers.
486	*/
487	/** @todo not sure about IRET, may generate Trap 0d (\#GP), NEED TO CHECK! */
488	if ( pu8Code[0] == 0x9a /* CALL FAR */
489	\|\| ( pu8Code[0] == 0xff /* CALL FAR [] */
490	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x18)
491	\|\| pu8Code[0] == 0xea /* JMP FAR */
492	\|\| ( pu8Code[0] == 0xff /* JMP FAR [] */
493	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x28)
494	\|\| pu8Code[0] == 0xcf /* IRET */
495	)
496	{
497	/*
498	* Got potential call to callgate.
499	* We simply return execution to the recompiler to do emulation
500	* starting from the instruction which caused the trap.
501	*/
502	pTrpm->uActiveVector = ~0;
503	return VINF_EM_RAW_RING_SWITCH;
504	}
505	}
506
507	/*
508	* Pass trap 0b as is to the recompiler in all other cases.
509	*/
510	return VINF_EM_RAW_GUEST_TRAP;
511	}
512
513
514	/**
515	* \#GP (General Protection Fault) handler for Ring-0 privileged instructions.
516	*
517	* @returns VBox status code.
518	* VINF_SUCCESS means we completely handled this trap,
519	* other codes are passed execution to host context.
520	*
521	* @param pVM The VM handle.
522	* @param pRegFrame Pointer to the register frame for the trap.
523	* @param pCpu The opcode info.
524	* @param PC The program counter corresponding to cs:eip in pRegFrame.
525	*/
526	static int trpmGCTrap0dHandlerRing0(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
527	{
528	int rc;
529
530	/*
531	* Try handle it here, if not return to HC and emulate/interpret it there.
532	*/
533	switch (pCpu->pCurInstr->opcode)
534	{
535	case OP_INT3:
536	/*
537	* Little hack to make the code below not fail
538	*/
539	pCpu->param1.flags = USE_IMMEDIATE8;
540	pCpu->param1.parval = 3;
541	/* fallthru */
542	case OP_INT:
543	{
544	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
545	Assert(!(PATMIsPatchGCAddr(pVM, PC)));
546	if (pCpu->param1.parval == 3)
547	{
548	/* Int 3 replacement patch? */
549	if (PATMHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS)
550	{
551	AssertFailed();
552	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
553	}
554	}
555	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
556	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
557	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
558
559	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
560	pVM->trpm.s.fActiveSoftwareInterrupt = true;
561	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
562	}
563
564	#ifdef PATM_EMULATE_SYSENTER
565	case OP_SYSEXIT:
566	case OP_SYSRET:
567	rc = PATMSysCall(pVM, pRegFrame, pCpu);
568	return trpmGCExitTrap(pVM, rc, pRegFrame);
569	#endif
570
571	case OP_HLT:
572	/* If it's in patch code, defer to ring-3. */
573	if (PATMIsPatchGCAddr(pVM, PC))
574	break;
575
576	pRegFrame->eip += pCpu->opsize;
577	return trpmGCExitTrap(pVM, VINF_EM_HALT, pRegFrame);
578
579
580	/*
581	* These instructions are used by PATM and CASM for finding
582	* dangerous non-trapping instructions. Thus, since all
583	* scanning and patching is done in ring-3 we'll have to
584	* return to ring-3 on the first encounter of these instructions.
585	*/
586	case OP_MOV_CR:
587	case OP_MOV_DR:
588	/* We can safely emulate control/debug register move instructions in patched code. */
589	if ( !PATMIsPatchGCAddr(pVM, PC)
590	&& !CSAMIsKnownDangerousInstr(pVM, PC))
591	break;
592	case OP_INVLPG:
593	case OP_LLDT:
594	case OP_STI:
595	case OP_RDTSC:
596	{
597	uint32_t cbIgnored;
598	rc = EMInterpretInstructionCPU(pVM, pCpu, pRegFrame, PC, &cbIgnored);
599	if (VBOX_SUCCESS(rc))
600	pRegFrame->eip += pCpu->opsize;
601	else if (rc == VERR_EM_INTERPRETER)
602	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
603	return trpmGCExitTrap(pVM, rc, pRegFrame);
604	}
605	}
606
607	return trpmGCExitTrap(pVM, VINF_EM_RAW_EXCEPTION_PRIVILEGED, pRegFrame);
608	}
609
610
611	/**
612	* \#GP (General Protection Fault) handler for Ring-3.
613	*
614	* @returns VBox status code.
615	* VINF_SUCCESS means we completely handled this trap,
616	* other codes are passed execution to host context.
617	*
618	* @param pVM The VM handle.
619	* @param pRegFrame Pointer to the register frame for the trap.
620	* @param pCpu The opcode info.
621	* @param PC The program counter corresponding to cs:eip in pRegFrame.
622	*/
623	static int trpmGCTrap0dHandlerRing3(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
624	{
625	int rc;
626
627	Assert(!pRegFrame->eflags.Bits.u1VM);
628
629	switch (pCpu->pCurInstr->opcode)
630	{
631	/*
632	* STI and CLI are I/O privileged, i.e. if IOPL
633	*/
634	case OP_STI:
635	case OP_CLI:
636	{
637	uint32_t efl = CPUMRawGetEFlags(pVM, pRegFrame);
638	if (X86_EFL_GET_IOPL(efl) >= (unsigned)(pRegFrame->ss & X86_SEL_RPL))
639	{
640	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n"));
641	return trpmGCExitTrap(pVM, VINF_EM_RESCHEDULE_REM, pRegFrame);
642	}
643	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0)\n"));
644	break;
645	}
646
647	/*
648	* INT3 and INT xx are ring-switching.
649	* (The shadow IDT will have set the entries to DPL=0, that's why we're here.)
650	*/
651	case OP_INT3:
652	/*
653	* Little hack to make the code below not fail
654	*/
655	pCpu->param1.flags = USE_IMMEDIATE8;
656	pCpu->param1.parval = 3;
657	/* fall thru */
658	case OP_INT:
659	{
660	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
661	rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT);
662	if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
663	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
664
665	pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
666	pVM->trpm.s.fActiveSoftwareInterrupt = true;
667	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
668	}
669
670	/*
671	* SYSCALL, SYSENTER, INTO and BOUND are also ring-switchers.
672	*/
673	case OP_SYSCALL:
674	case OP_SYSENTER:
675	#ifdef PATM_EMULATE_SYSENTER
676	rc = PATMSysCall(pVM, pRegFrame, pCpu);
677	if (rc == VINF_SUCCESS)
678	return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame);
679	/* else no break; */
680	#endif
681	case OP_BOUND:
682	case OP_INTO:
683	pVM->trpm.s.uActiveVector = ~0;
684	return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH, pRegFrame);
685
686	/*
687	* Handle virtualized TSC reads.
688	*/
689	case OP_RDTSC:
690	{
691	uint32_t cbIgnored;
692	rc = EMInterpretInstructionCPU(pVM, pCpu, pRegFrame, PC, &cbIgnored);
693	if (VBOX_SUCCESS(rc))
694	pRegFrame->eip += pCpu->opsize;
695	else if (rc == VERR_EM_INTERPRETER)
696	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
697	return trpmGCExitTrap(pVM, rc, pRegFrame);
698	}
699	}
700
701	/*
702	* A genuine guest fault.
703	*/
704	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
705	}
706
707
708	/**
709	* \#GP (General Protection Fault) handler.
710	*
711	* @returns VBox status code.
712	* VINF_SUCCESS means we completely handled this trap,
713	* other codes are passed execution to host context.
714	*
715	* @param pVM The VM handle.
716	* @param pTrpm Pointer to TRPM data (within VM).
717	* @param pRegFrame Pointer to the register frame for the trap.
718	*/
719	static int trpmGCTrap0dHandler(PVM pVM, PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
720	{
721	LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%VGv uErr=%RX32\n", pRegFrame->ss, pRegFrame->eip, pTrpm->uActiveErrorCode));
722
723	#if 0 /* not right for iret. Shouldn't really be needed as SELMValidateAndConvertCSAddr deals with invalid cs. */
724	/*
725	* Filter out selector problems first as these may mean that the
726	* instruction isn't safe to read. If we're here because CS is NIL
727	* the flattening of cs:eip will deal with that.
728	*/
729	if ( !(pTrpm->uActiveErrorCode & (X86_TRAP_ERR_IDT \| X86_TRAP_ERR_EXTERNAL))
730	&& (pTrpm->uActiveErrorCode & X86_TRAP_ERR_SEL_MASK))
731	{
732	/* It's a guest trap. */
733	return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
734	}
735	#endif
736
737	STAM_PROFILE_ADV_START(&pVM->trpm.s.StatTrap0dDisasm, a);
738	/*
739	* Decode the instruction.
740	*/
741	RTGCPTR PC;
742	int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
743	if (VBOX_FAILURE(rc))
744	{
745	Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n",
746	pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
747	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
748	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
749	}
750
751	DISCPUSTATE Cpu;
752	uint32_t cbOp;
753	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
754	if (VBOX_FAILURE(rc))
755	{
756	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
757	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
758	}
759	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
760
761	/*
762	* Deal with I/O port access.
763	*/
764	if ( pVM->trpm.s.uActiveErrorCode == 0
765	&& (Cpu.pCurInstr->optype & OPTYPE_PORTIO))
766	{
767	rc = EMInterpretPortIO(pVM, pRegFrame, &Cpu, cbOp);
768	return trpmGCExitTrap(pVM, rc, pRegFrame);
769	}
770
771
772	/*
773	* Deal with Ring-0 (privileged instructions)
774	*/
775	if ( (pRegFrame->ss & X86_SEL_RPL) <= 1
776	&& !pRegFrame->eflags.Bits.u1VM)
777	return trpmGCTrap0dHandlerRing0(pVM, pRegFrame, &Cpu, PC);
778
779	/*
780	* Deal with Ring-3 GPs.
781	*/
782	if (!pRegFrame->eflags.Bits.u1VM)
783	return trpmGCTrap0dHandlerRing3(pVM, pRegFrame, &Cpu, PC);
784
785	/*
786	* Deal with v86 code.
787	*/
788
789	/* 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.
790	* Simply fall back to the recompiler to emulate this instruction.
791	*/
792	/* Retrieve the eflags including the virtualized bits. */
793	/** @note hackish as the cpumctxcore structure doesn't contain the right value */
794	X86EFLAGS eflags;
795	eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame);
796	if (eflags.Bits.u2IOPL != 3)
797	{
798	Assert(eflags.Bits.u2IOPL == 0);
799
800	int rc = TRPMForwardTrap(pVM, pRegFrame, 0xD, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
801	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
802	return trpmGCExitTrap(pVM, rc, pRegFrame);
803	}
804	return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
805	}
806
807
808	/**
809	* \#GP (General Protection Fault) handler.
810	*
811	* @returns VBox status code.
812	* VINF_SUCCESS means we completely handled this trap,
813	* other codes are passed execution to host context.
814	*
815	* @param pTrpm Pointer to TRPM data (within VM).
816	* @param pRegFrame Pointer to the register frame for the trap.
817	* @internal
818	*/
819	DECLASM(int) TRPMGCTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
820	{
821	LogFlow(("TRPMGCTrap0dHandler: eip=%RGv\n", pRegFrame->eip));
822	PVM pVM = TRPM2VM(pTrpm);
823
824	int rc = trpmGCTrap0dHandler(pVM, pTrpm, pRegFrame);
825	switch (rc)
826	{
827	case VINF_EM_RAW_GUEST_TRAP:
828	case VINF_EM_RAW_EXCEPTION_PRIVILEGED:
829	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
830	rc = VINF_PATM_PATCH_TRAP_GP;
831	break;
832
833	case VINF_EM_RAW_INTERRUPT_PENDING:
834	Assert(TRPMHasTrap(pVM));
835	/* no break; */
836	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
837	case VINF_IOM_HC_IOPORT_READWRITE:
838	case VINF_IOM_HC_IOPORT_READ:
839	case VINF_IOM_HC_IOPORT_WRITE:
840	case VINF_IOM_HC_MMIO_WRITE:
841	case VINF_IOM_HC_MMIO_READ:
842	case VINF_IOM_HC_MMIO_READ_WRITE:
843	case VINF_PATM_PATCH_INT3:
844	case VINF_EM_RAW_TO_R3:
845	case VINF_EM_RAW_TIMER_PENDING:
846	case VINF_EM_PENDING_REQUEST:
847	case VINF_EM_HALT:
848	case VINF_SUCCESS:
849	break;
850
851	default:
852	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("return code %d\n", rc));
853	break;
854	}
855	return rc;
856	}
857
858	/**
859	* \#PF (Page Fault) handler.
860	*
861	* Calls PGM which does the actual handling.
862	*
863	*
864	* @returns VBox status code.
865	* VINF_SUCCESS means we completely handled this trap,
866	* other codes are passed execution to host context.
867	*
868	* @param pTrpm Pointer to TRPM data (within VM).
869	* @param pRegFrame Pointer to the register frame for the trap.
870	* @internal
871	*/
872	DECLASM(int) TRPMGCTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
873	{
874	LogBird(("TRPMGCTrap0eHandler: eip=%RGv\n", pRegFrame->eip));
875	PVM pVM = TRPM2VM(pTrpm);
876
877	/*
878	* This is all PGM stuff.
879	*/
880	int rc = PGMTrap0eHandler(pVM, pTrpm->uActiveErrorCode, pRegFrame, (RTGCPTR)pTrpm->uActiveCR2);
881
882	switch (rc)
883	{
884	case VINF_EM_RAW_EMULATE_INSTR:
885	case VINF_EM_RAW_EMULATE_INSTR_PD_FAULT:
886	case VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT:
887	case VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT:
888	case VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT:
889	case VINF_EM_RAW_EMULATE_INSTR_IDT_FAULT:
890	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
891	rc = VINF_PATCH_EMULATE_INSTR;
892	break;
893
894	case VINF_EM_RAW_GUEST_TRAP:
895	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
896	return VINF_PATM_PATCH_TRAP_PF;
897
898	rc = TRPMForwardTrap(pVM, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP);
899	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
900	break;
901
902	case VINF_EM_RAW_INTERRUPT_PENDING:
903	Assert(TRPMHasTrap(pVM));
904	/* no break; */
905	case VINF_IOM_HC_MMIO_READ:
906	case VINF_IOM_HC_MMIO_WRITE:
907	case VINF_IOM_HC_MMIO_READ_WRITE:
908	case VINF_PATM_HC_MMIO_PATCH_READ:
909	case VINF_PATM_HC_MMIO_PATCH_WRITE:
910	case VINF_SUCCESS:
911	case VINF_EM_RAW_TO_R3:
912	case VINF_EM_PENDING_REQUEST:
913	case VINF_EM_RAW_TIMER_PENDING:
914	case VINF_CSAM_PENDING_ACTION:
915	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
916	break;
917
918	default:
919	AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip));
920	break;
921	}
922	return trpmGCExitTrap(pVM, rc, pRegFrame);
923	}
924
925
926	/**
927	* Scans for the EIP in the specified array of trap handlers.
928	*
929	* If we don't fine the EIP, we'll panic.
930	*
931	* @returns VBox status code.
932	*
933	* @param pVM The VM handle.
934	* @param pRegFrame Pointer to the register frame for the trap.
935	* @param paHandlers The array of trap handler records.
936	* @param pEndRecord The end record (exclusive).
937	*/
938	static int trpmGCHyperGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, PCTRPMGCHYPER paHandlers, PCTRPMGCHYPER pEndRecord)
939	{
940	uintptr_t uEip = (uintptr_t)pRegFrame->eip;
941	Assert(paHandlers <= pEndRecord);
942
943	Log(("trpmGCHyperGeneric: uEip=%x %p-%p\n", uEip, paHandlers, pEndRecord));
944
945	#if 0 /// @todo later
946	/*
947	* Start by doing a kind of binary search.
948	*/
949	unsigned iStart = 0;
950	unsigned iEnd = pEndRecord - paHandlers;
951	unsigned i = iEnd / 2;
952	#endif
953
954	/*
955	* Do a linear search now (in case the array wasn't properly sorted).
956	*/
957	for (PCTRPMGCHYPER pCur = paHandlers; pCur < pEndRecord; pCur++)
958	{
959	if ( pCur->uStartEIP <= uEip
960	&& (pCur->uEndEIP ? pCur->uEndEIP > uEip : pCur->uStartEIP == uEip))
961	return pCur->pfnHandler(pVM, pRegFrame, pCur->uUser);
962	}
963
964	return VERR_TRPM_DONT_PANIC;
965	}
966
967
968	/**
969	* Hypervisor \#NP ((segment) Not Present) handler.
970	*
971	* Scans for the EIP in the registered trap handlers.
972	*
973	* @returns VBox status code.
974	* VINF_SUCCESS means we completely handled this trap,
975	* other codes are passed back to host context.
976	*
977	* @param pTrpm Pointer to TRPM data (within VM).
978	* @param pRegFrame Pointer to the register frame for the trap.
979	* @internal
980	*/
981	DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
982	{
983	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0bHandlers, g_aTrap0bHandlersEnd);
984	}
985
986
987	/**
988	* Hypervisor \#GP (General Protection Fault) handler.
989	*
990	* Scans for the EIP in the registered trap handlers.
991	*
992	* @returns VBox status code.
993	* VINF_SUCCESS means we completely handled this trap,
994	* other codes are passed back to host context.
995	*
996	* @param pTrpm Pointer to TRPM data (within VM).
997	* @param pRegFrame Pointer to the register frame for the trap.
998	* @internal
999	*/
1000	DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
1001	{
1002	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1003	}
1004
1005
1006	/**
1007	* Hypervisor \#PF (Page Fault) handler.
1008	*
1009	* Scans for the EIP in the registered trap handlers.
1010	*
1011	* @returns VBox status code.
1012	* VINF_SUCCESS means we completely handled this trap,
1013	* other codes are passed back to host context.
1014	*
1015	* @param pTrpm Pointer to TRPM data (within VM).
1016	* @param pRegFrame Pointer to the register frame for the trap.
1017	* @internal
1018	*/
1019	DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame)
1020	{
1021	return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1022	}
1023
1024
1025	/**
1026	* Deal with hypervisor traps occuring when resuming execution on a trap.
1027	*
1028	* @returns VBox status code.
1029	* @param pVM The VM handle.
1030	* @param pRegFrame Register frame.
1031	* @param uUser User arg.
1032	*/
1033	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
1034	{
1035	Log(("********************************************************\n"));
1036	Log(("trpmGCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
1037	Log(("********************************************************\n"));
1038
1039	if (uUser & TRPM_TRAP_IN_HYPER)
1040	{
1041	/*
1042	* Check that there is still some stack left, if not we'll flag
1043	* a guru meditation (the alternative is a triple fault).
1044	*/
1045	RTGCUINTPTR cbStackUsed = (RTGCUINTPTR)VMMGetStackGC(pVM) - pRegFrame->esp;
1046	if (cbStackUsed > VMM_STACK_SIZE - _1K)
1047	{
1048	LogRel(("trpmGCTrapInGeneric: ran out of stack: esp=#x cbStackUsed=%#x\n", pRegFrame->esp, cbStackUsed));
1049	return VERR_TRPM_DONT_PANIC;
1050	}
1051
1052	/*
1053	* Just zero the register containing the selector in question.
1054	* We'll deal with the actual stale or troublesome selector value in
1055	* the outermost trap frame.
1056	*/
1057	switch (uUser & TRPM_TRAP_IN_OP_MASK)
1058	{
1059	case TRPM_TRAP_IN_MOV_GS:
1060	pRegFrame->eax = 0;
1061	pRegFrame->gs = 0; /* prevent recursive trouble. */
1062	break;
1063	case TRPM_TRAP_IN_MOV_FS:
1064	pRegFrame->eax = 0;
1065	pRegFrame->fs = 0; /* prevent recursive trouble. */
1066	return VINF_SUCCESS;
1067
1068	default:
1069	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1070	return VERR_INTERNAL_ERROR;
1071	}
1072	}
1073	else
1074	{
1075	/*
1076	* Reconstruct the guest context and switch to the recompiler.
1077	* We ASSUME we're only at
1078	*/
1079	CPUMCTXCORE CtxCore = *pRegFrame;
1080	uint32_t pEsp = (uint32_t )pRegFrame->esp;
1081	int rc;
1082
1083	switch (uUser)
1084	{
1085	/*
1086	* This will only occur when resuming guest code in a trap handler!
1087	*/
1088	/* @note ASSUMES esp points to the temporary guest CPUMCTXCORE!!! */
1089	case TRPM_TRAP_IN_MOV_GS:
1090	case TRPM_TRAP_IN_MOV_FS:
1091	case TRPM_TRAP_IN_MOV_ES:
1092	case TRPM_TRAP_IN_MOV_DS:
1093	{
1094	PCPUMCTXCORE pTempGuestCtx = (PCPUMCTXCORE)pEsp;
1095
1096	/* Just copy the whole thing; several selector registers, eip (etc) and eax are not yet in pRegFrame. */
1097	CtxCore = *pTempGuestCtx;
1098	rc = VINF_EM_RAW_STALE_SELECTOR;
1099	break;
1100	}
1101
1102	/*
1103	* This will only occur when resuming guest code!
1104	*/
1105	case TRPM_TRAP_IN_IRET:
1106	CtxCore.eip = *pEsp++;
1107	CtxCore.cs = (RTSEL)*pEsp++;
1108	CtxCore.eflags.u32 = *pEsp++;
1109	CtxCore.esp = *pEsp++;
1110	CtxCore.ss = (RTSEL)*pEsp++;
1111	rc = VINF_EM_RAW_IRET_TRAP;
1112	break;
1113
1114	/*
1115	* This will only occur when resuming V86 guest code!
1116	*/
1117	case TRPM_TRAP_IN_IRET \| TRPM_TRAP_IN_V86:
1118	CtxCore.eip = *pEsp++;
1119	CtxCore.cs = (RTSEL)*pEsp++;
1120	CtxCore.eflags.u32 = *pEsp++;
1121	CtxCore.esp = *pEsp++;
1122	CtxCore.ss = (RTSEL)*pEsp++;
1123	CtxCore.es = (RTSEL)*pEsp++;
1124	CtxCore.ds = (RTSEL)*pEsp++;
1125	CtxCore.fs = (RTSEL)*pEsp++;
1126	CtxCore.gs = (RTSEL)*pEsp++;
1127	rc = VINF_EM_RAW_IRET_TRAP;
1128	break;
1129
1130	default:
1131	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1132	return VERR_INTERNAL_ERROR;
1133	}
1134
1135
1136	CPUMSetGuestCtxCore(pVM, &CtxCore);
1137	TRPMGCHyperReturnToHost(pVM, rc);
1138	}
1139
1140	AssertMsgFailed(("Impossible!\n"));
1141	return VERR_INTERNAL_ERROR;
1142	}
1143

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source: vbox/trunk/src/VBox/VMM/VMMGC/TRPMGCHandlers.cpp@ 2095

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