TRPMGCHandlers.cpp@ 25252

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1	/* $Id: TRPMGCHandlers.cpp 25252 2009-12-08 18:19:39Z vboxsync $ */
2	/** @file
3	* TRPM - Guest Context Trap Handlers, CPP part
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
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/vmm.h>
40	#include <VBox/param.h>
41
42	#include <VBox/err.h>
43	#include <VBox/dis.h>
44	#include <VBox/disopcode.h>
45	#include <VBox/x86.h>
46	#include <VBox/log.h>
47	#include <VBox/tm.h>
48	#include <iprt/asm.h>
49	#include <iprt/assert.h>
50
51	/*******************************************************************************
52	* Defined Constants And Macros *
53	*******************************************************************************/
54	/* still here. MODR/M byte parsing */
55	#define X86_OPCODE_MODRM_MOD_MASK 0xc0
56	#define X86_OPCODE_MODRM_REG_MASK 0x38
57	#define X86_OPCODE_MODRM_RM_MASK 0x07
58
59	/** @todo fix/remove/permanent-enable this when DIS/PATM handles invalid lock sequences. */
60	#define DTRACE_EXPERIMENT
61
62
63	/*******************************************************************************
64	* Structures and Typedefs *
65	*******************************************************************************/
66	/** Pointer to a readonly hypervisor trap record. */
67	typedef const struct TRPMGCHYPER *PCTRPMGCHYPER;
68
69	/**
70	* A hypervisor trap record.
71	* This contains information about a handler for a instruction range.
72	*
73	* @remark This must match what TRPM_HANDLER outputs.
74	*/
75	typedef struct TRPMGCHYPER
76	{
77	/** The start address. */
78	uintptr_t uStartEIP;
79	/** The end address. (exclusive)
80	* If NULL the it's only for the instruction at pvStartEIP. */
81	uintptr_t uEndEIP;
82	/**
83	* The handler.
84	*
85	* @returns VBox status code
86	* VINF_SUCCESS means we've handled the trap.
87	* Any other error code means returning to the host context.
88	* @param pVM The VM handle.
89	* @param pRegFrame The register frame.
90	* @param uUser The user argument.
91	*/
92	DECLRCCALLBACKMEMBER(int, pfnHandler, (PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser));
93	/** Whatever the handler desires to put here. */
94	uintptr_t uUser;
95	} TRPMGCHYPER;
96
97
98	/*******************************************************************************
99	* Global Variables *
100	*******************************************************************************/
101	RT_C_DECLS_BEGIN
102	/** Defined in VMMGC0.asm or VMMGC99.asm.
103	* @{ */
104	extern const TRPMGCHYPER g_aTrap0bHandlers[1];
105	extern const TRPMGCHYPER g_aTrap0bHandlersEnd[1];
106	extern const TRPMGCHYPER g_aTrap0dHandlers[1];
107	extern const TRPMGCHYPER g_aTrap0dHandlersEnd[1];
108	extern const TRPMGCHYPER g_aTrap0eHandlers[1];
109	extern const TRPMGCHYPER g_aTrap0eHandlersEnd[1];
110	/** @} */
111	RT_C_DECLS_END
112
113
114	/*******************************************************************************
115	* Internal Functions *
116	*******************************************************************************/
117	RT_C_DECLS_BEGIN /* addressed from asm (not called so no DECLASM). */
118	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser);
119	RT_C_DECLS_END
120
121
122
123	/**
124	* Exits the trap, called when exiting a trap handler.
125	*
126	* Will reset the trap if it's not a guest trap or the trap
127	* is already handled. Will process resume guest FFs.
128	*
129	* @returns rc, can be adjusted if its VINF_SUCCESS or something really bad
130	* happened.
131	* @param pVM VM handle.
132	* @param pVCpu The virtual CPU handle.
133	* @param rc The VBox status code to return.
134	* @param pRegFrame Pointer to the register frame for the trap.
135	*/
136	static int trpmGCExitTrap(PVM pVM, PVMCPU pVCpu, int rc, PCPUMCTXCORE pRegFrame)
137	{
138	uint32_t uOldActiveVector = pVCpu->trpm.s.uActiveVector;
139	NOREF(uOldActiveVector);
140
141	/* Reset trap? */
142	if ( rc != VINF_EM_RAW_GUEST_TRAP
143	&& rc != VINF_EM_RAW_RING_SWITCH_INT)
144	pVCpu->trpm.s.uActiveVector = ~0;
145
146	#ifdef VBOX_HIGH_RES_TIMERS_HACK
147	/*
148	* We should poll the timers occationally.
149	* We must NOT do this too frequently as it adds a significant overhead
150	* and it'll kill us if the trap load is high. (See #1354.)
151	* (The heuristic is not very intelligent, we should really check trap
152	* frequency etc. here, but alas, we lack any such information atm.)
153	*/
154	static unsigned s_iTimerPoll = 0;
155	if (rc == VINF_SUCCESS)
156	{
157	if (!(++s_iTimerPoll & 0xf))
158	{
159	TMTimerPollVoid(pVM, pVCpu);
160	Log2(("TMTimerPoll at %08RX32 - VM_FF_TM_VIRTUAL_SYNC=%d VM_FF_TM_VIRTUAL_SYNC=%d\n", pRegFrame->eip,
161	VM_FF_ISPENDING(pVM, VM_FF_TM_VIRTUAL_SYNC), VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TIMER)));
162	}
163	}
164	else
165	s_iTimerPoll = 0;
166	#endif
167
168	/* Clear pending inhibit interrupt state if required. (necessary for dispatching interrupts later on) */
169	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS))
170	{
171	Log2(("VM_FF_INHIBIT_INTERRUPTS at %08RX32 successor %RGv\n", pRegFrame->eip, EMGetInhibitInterruptsPC(pVCpu)));
172	if (pRegFrame->eip != EMGetInhibitInterruptsPC(pVCpu))
173	{
174	/** @note we intentionally don't clear VM_FF_INHIBIT_INTERRUPTS here if the eip is the same as the inhibited instr address.
175	* Before we are able to execute this instruction in raw mode (iret to guest code) an external interrupt might
176	* force a world switch again. Possibly allowing a guest interrupt to be dispatched in the process. This could
177	* break the guest. Sounds very unlikely, but such timing sensitive problem are not as rare as you might think.
178	*/
179	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS);
180	}
181	}
182
183	/*
184	* Pending resume-guest-FF?
185	* Or pending (A)PIC interrupt? Windows XP will crash if we delay APIC interrupts.
186	*/
187	if ( rc == VINF_SUCCESS
188	&& ( VM_FF_ISPENDING(pVM, VM_FF_TM_VIRTUAL_SYNC \| VM_FF_REQUEST \| VM_FF_PGM_NO_MEMORY)
189	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TIMER \| VMCPU_FF_TO_R3 \| VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_REQUEST \| VMCPU_FF_PGM_SYNC_CR3 \| VMCPU_FF_PGM_SYNC_CR3_NON_GLOBAL)
190	)
191	)
192	{
193	/* The out of memory condition naturally outrang the others. */
194	if (RT_UNLIKELY(VM_FF_ISPENDING(pVM, VM_FF_PGM_NO_MEMORY)))
195	rc = VINF_EM_NO_MEMORY;
196	/* Pending Ring-3 action. */
197	else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TO_R3))
198	{
199	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_TO_R3);
200	rc = VINF_EM_RAW_TO_R3;
201	}
202	/* Pending timer action. */
203	else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TIMER))
204	rc = VINF_EM_RAW_TIMER_PENDING;
205	/* The Virtual Sync clock has stopped. */
206	else if (VM_FF_ISPENDING(pVM, VM_FF_TM_VIRTUAL_SYNC))
207	rc = VINF_EM_RAW_TO_R3;
208	/* Pending interrupt: dispatch it. */
209	else if ( VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC)
210	&& !VMCPU_FF_ISSET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS)
211	&& PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame)
212	)
213	{
214	uint8_t u8Interrupt;
215	rc = PDMGetInterrupt(pVCpu, &u8Interrupt);
216	Log(("trpmGCExitTrap: u8Interrupt=%d (%#x) rc=%Rrc\n", u8Interrupt, u8Interrupt, rc));
217	AssertFatalMsgRC(rc, ("PDMGetInterrupt failed with %Rrc\n", rc));
218	rc = TRPMForwardTrap(pVCpu, pRegFrame, (uint32_t)u8Interrupt, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_HARDWARE_INT, uOldActiveVector);
219	/* can't return if successful */
220	Assert(rc != VINF_SUCCESS);
221
222	/* Stop the profile counter that was started in TRPMGCHandlersA.asm */
223	Assert(uOldActiveVector <= 16);
224	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a);
225
226	/* Assert the trap and go to the recompiler to dispatch it. */
227	TRPMAssertTrap(pVCpu, u8Interrupt, TRPM_HARDWARE_INT);
228
229	STAM_PROFILE_ADV_START(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a);
230	rc = VINF_EM_RAW_INTERRUPT_PENDING;
231	}
232	/*
233	* Try sync CR3?
234	*/
235	else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_PGM_SYNC_CR3 \| VMCPU_FF_PGM_SYNC_CR3_NON_GLOBAL))
236	#if 1
237	rc = PGMSyncCR3(pVCpu, CPUMGetGuestCR0(pVCpu), CPUMGetGuestCR3(pVCpu), CPUMGetGuestCR4(pVCpu), VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3));
238	#else
239	rc = VINF_PGM_SYNC_CR3;
240	#endif
241	/* Pending request packets might contain actions that need immediate attention, such as pending hardware interrupts. */
242	else if ( VM_FF_ISPENDING(pVM, VM_FF_REQUEST)
243	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_REQUEST))
244	rc = VINF_EM_PENDING_REQUEST;
245	}
246
247	AssertMsg( rc != VINF_SUCCESS
248	\|\| ( pRegFrame->eflags.Bits.u1IF
249	&& ( pRegFrame->eflags.Bits.u2IOPL < (unsigned)(pRegFrame->ss & X86_SEL_RPL) \|\| pRegFrame->eflags.Bits.u1VM))
250	, ("rc=%Rrc\neflags=%RX32 ss=%RTsel IOPL=%d\n", rc, pRegFrame->eflags.u32, pRegFrame->ss, pRegFrame->eflags.Bits.u2IOPL));
251	return rc;
252	}
253
254
255	/**
256	* \#DB (Debug event) handler.
257	*
258	* @returns VBox status code.
259	* VINF_SUCCESS means we completely handled this trap,
260	* other codes are passed execution to host context.
261	*
262	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
263	* @param pRegFrame Pointer to the register frame for the trap.
264	* @internal
265	*/
266	DECLASM(int) TRPMGCTrap01Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
267	{
268	RTGCUINTREG uDr6 = ASMGetAndClearDR6();
269	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
270	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
271
272	LogFlow(("TRPMGC01: cs:eip=%04x:%08x uDr6=%RTreg\n", pRegFrame->cs, pRegFrame->eip, uDr6));
273
274	/*
275	* We currently don't make sure of the X86_DR7_GD bit, but
276	* there might come a time when we do.
277	*/
278	if ((uDr6 & X86_DR6_BD) == X86_DR6_BD)
279	{
280	AssertReleaseMsgFailed(("X86_DR6_BD isn't used, but it's set! dr7=%RTreg(%RTreg) dr6=%RTreg\n",
281	ASMGetDR7(), CPUMGetHyperDR7(pVCpu), uDr6));
282	return VERR_NOT_IMPLEMENTED;
283	}
284
285	AssertReleaseMsg(!(uDr6 & X86_DR6_BT), ("X86_DR6_BT is impossible!\n"));
286
287	/*
288	* Now leave the rest to the DBGF.
289	*/
290	int rc = DBGFRZTrap01Handler(pVM, pVCpu, pRegFrame, uDr6);
291	if (rc == VINF_EM_RAW_GUEST_TRAP)
292	CPUMSetGuestDR6(pVCpu, uDr6);
293
294	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
295	Log6(("TRPMGC01: %Rrc (%04x:%08x %RTreg)\n", rc, pRegFrame->cs, pRegFrame->eip, uDr6));
296	return rc;
297	}
298
299
300	/**
301	* NMI handler, for when we are using NMIs to debug things.
302	*
303	* @returns VBox status code.
304	* VINF_SUCCESS means we completely handled this trap,
305	* other codes are passed execution to host context.
306	*
307	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
308	* @param pRegFrame Pointer to the register frame for the trap.
309	* @internal
310	* @remark This is not hooked up unless you're building with VBOX_WITH_NMI defined.
311	*/
312	DECLASM(int) TRPMGCTrap02Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
313	{
314	LogFlow(("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
315	RTLogComPrintf("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip);
316	return VERR_TRPM_DONT_PANIC;
317	}
318
319
320	/**
321	* \#BP (Breakpoint) handler.
322	*
323	* @returns VBox status code.
324	* VINF_SUCCESS means we completely handled this trap,
325	* other codes are passed execution to host context.
326	*
327	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
328	* @param pRegFrame Pointer to the register frame for the trap.
329	* @internal
330	*/
331	DECLASM(int) TRPMGCTrap03Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
332	{
333	LogFlow(("TRPMGC03: %04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
334	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
335	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
336	int rc;
337
338	/*
339	* Both PATM are using INT3s, let them have a go first.
340	*/
341	if ( (pRegFrame->ss & X86_SEL_RPL) == 1
342	&& !pRegFrame->eflags.Bits.u1VM)
343	{
344	rc = PATMHandleInt3PatchTrap(pVM, pRegFrame);
345	if (rc == VINF_SUCCESS \|\| rc == VINF_EM_RAW_EMULATE_INSTR \|\| rc == VINF_PATM_PATCH_INT3 \|\| rc == VINF_PATM_DUPLICATE_FUNCTION)
346	{
347	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
348	Log6(("TRPMGC03: %Rrc (%04x:%08x) (PATM)\n", rc, pRegFrame->cs, pRegFrame->eip));
349	return rc;
350	}
351	}
352	rc = DBGFRZTrap03Handler(pVM, pVCpu, pRegFrame);
353
354	/* anything we should do with this? Schedule it in GC? */
355	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
356	Log6(("TRPMGC03: %Rrc (%04x:%08x)\n", rc, pRegFrame->cs, pRegFrame->eip));
357	return rc;
358	}
359
360
361	/**
362	* Trap handler for illegal opcode fault (\#UD).
363	*
364	* @returns VBox status code.
365	* VINF_SUCCESS means we completely handled this trap,
366	* other codes are passed execution to host context.
367	*
368	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
369	* @param pRegFrame Pointer to the register frame for the trap.
370	* @internal
371	*/
372	DECLASM(int) TRPMGCTrap06Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
373	{
374	LogFlow(("TRPMGC06: %04x:%08x efl=%x\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->eflags.u32));
375	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
376	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
377	int rc;
378
379	if (CPUMGetGuestCPL(pVCpu, pRegFrame) == 0)
380	{
381	/*
382	* Decode the instruction.
383	*/
384	RTGCPTR PC;
385	rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
386	if (RT_FAILURE(rc))
387	{
388	Log(("TRPMGCTrap06Handler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Rrc !!\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
389	rc = trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
390	Log6(("TRPMGC06: %Rrc (%04x:%08x) (SELM)\n", rc, pRegFrame->cs, pRegFrame->eip));
391	return rc;
392	}
393
394	DISCPUSTATE Cpu;
395	uint32_t cbOp;
396	rc = EMInterpretDisasOneEx(pVM, pVCpu, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
397	if (RT_FAILURE(rc))
398	{
399	rc = trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
400	Log6(("TRPMGC06: %Rrc (%04x:%08x) (EM)\n", rc, pRegFrame->cs, pRegFrame->eip));
401	return rc;
402	}
403
404	/*
405	* UD2 in a patch?
406	*/
407	if ( Cpu.pCurInstr->opcode == OP_ILLUD2
408	&& PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip))
409	{
410	rc = PATMGCHandleIllegalInstrTrap(pVM, pRegFrame);
411	/** @todo These tests are completely unnecessary, should just follow the
412	* flow and return at the end of the function. */
413	if ( rc == VINF_SUCCESS
414	\|\| rc == VINF_EM_RAW_EMULATE_INSTR
415	\|\| rc == VINF_PATM_DUPLICATE_FUNCTION
416	\|\| rc == VINF_PATM_PENDING_IRQ_AFTER_IRET
417	\|\| rc == VINF_EM_RESCHEDULE)
418	{
419	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
420	Log6(("TRPMGC06: %Rrc (%04x:%08x) (PATM)\n", rc, pRegFrame->cs, pRegFrame->eip));
421	return rc;
422	}
423	}
424	/*
425	* Speed up dtrace and don't entrust invalid lock sequences to the recompiler.
426	*/
427	else if (Cpu.prefix & PREFIX_LOCK)
428	{
429	Log(("TRPMGCTrap06Handler: pc=%08x op=%d\n", pRegFrame->eip, Cpu.pCurInstr->opcode));
430	#ifdef DTRACE_EXPERIMENT /** @todo fix/remove/permanent-enable this when DIS/PATM handles invalid lock sequences. */
431	Assert(!PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip));
432	rc = TRPMForwardTrap(pVCpu, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP, 0x6);
433	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
434	#else
435	rc = VINF_EM_RAW_EMULATE_INSTR;
436	#endif
437	}
438	/*
439	* Handle MONITOR - it causes an #UD exception instead of #GP when not executed in ring 0.
440	*/
441	else if (Cpu.pCurInstr->opcode == OP_MONITOR)
442	{
443	uint32_t cbIgnored;
444	rc = EMInterpretInstructionCPU(pVM, pVCpu, &Cpu, pRegFrame, PC, &cbIgnored);
445	if (RT_LIKELY(RT_SUCCESS(rc)))
446	pRegFrame->eip += Cpu.opsize;
447	}
448	/* Never generate a raw trap here; it might be an instruction, that requires emulation. */
449	else
450	rc = VINF_EM_RAW_EMULATE_INSTR;
451	}
452	else
453	{
454	rc = TRPMForwardTrap(pVCpu, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP, 0x6);
455	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
456	}
457
458	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
459	Log6(("TRPMGC06: %Rrc (%04x:%08x)\n", rc, pRegFrame->cs, pRegFrame->eip));
460	return rc;
461	}
462
463
464	/**
465	* Trap handler for device not present fault (\#NM).
466	*
467	* Device not available, FP or (F)WAIT instruction.
468	*
469	* @returns VBox status code.
470	* VINF_SUCCESS means we completely handled this trap,
471	* other codes are passed execution to host context.
472	*
473	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
474	* @param pRegFrame Pointer to the register frame for the trap.
475	* @internal
476	*/
477	DECLASM(int) TRPMGCTrap07Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
478	{
479	LogFlow(("TRPMGC07: %04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
480	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
481	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
482
483	int rc = CPUMHandleLazyFPU(pVCpu);
484	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
485	Log6(("TRPMGC07: %Rrc (%04x:%08x)\n", rc, pRegFrame->cs, pRegFrame->eip));
486	return rc;
487	}
488
489
490	/**
491	* \#NP ((segment) Not Present) handler.
492	*
493	* @returns VBox status code.
494	* VINF_SUCCESS means we completely handled this trap,
495	* other codes are passed execution to host context.
496	*
497	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
498	* @param pRegFrame Pointer to the register frame for the trap.
499	* @internal
500	*/
501	DECLASM(int) TRPMGCTrap0bHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
502	{
503	LogFlow(("TRPMGC0b: %04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
504	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
505
506	/*
507	* Try to detect instruction by opcode which caused trap.
508	* XXX note: this code may cause \#PF (trap e) or \#GP (trap d) while
509	* accessing user code. need to handle it somehow in future!
510	*/
511	RTGCPTR GCPtr;
512	if (SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &GCPtr) == VINF_SUCCESS)
513	{
514	uint8_t pu8Code = (uint8_t )(uintptr_t)GCPtr;
515
516	/*
517	* First skip possible instruction prefixes, such as:
518	* OS, AS
519	* CS:, DS:, ES:, SS:, FS:, GS:
520	* REPE, REPNE
521	*
522	* note: Currently we supports only up to 4 prefixes per opcode, more
523	* prefixes (normally not used anyway) will cause trap d in guest.
524	* note: Instruction length in IA-32 may be up to 15 bytes, we dont
525	* check this issue, its too hard.
526	*/
527	for (unsigned i = 0; i < 4; i++)
528	{
529	if ( pu8Code[0] != 0xf2 /* REPNE/REPNZ */
530	&& pu8Code[0] != 0xf3 /* REP/REPE/REPZ */
531	&& pu8Code[0] != 0x2e /* CS: */
532	&& pu8Code[0] != 0x36 /* SS: */
533	&& pu8Code[0] != 0x3e /* DS: */
534	&& pu8Code[0] != 0x26 /* ES: */
535	&& pu8Code[0] != 0x64 /* FS: */
536	&& pu8Code[0] != 0x65 /* GS: */
537	&& pu8Code[0] != 0x66 /* OS */
538	&& pu8Code[0] != 0x67 /* AS */
539	)
540	break;
541	pu8Code++;
542	}
543
544	/*
545	* Detect right switch using a callgate.
546	*
547	* We recognize the following causes for the trap 0b:
548	* CALL FAR, CALL FAR []
549	* JMP FAR, JMP FAR []
550	* IRET (may cause a task switch)
551	*
552	* Note: we can't detect whether the trap was caused by a call to a
553	* callgate descriptor or it is a real trap 0b due to a bad selector.
554	* In both situations we'll pass execution to our recompiler so we don't
555	* have to worry.
556	* If we wanted to do better detection, we have set GDT entries to callgate
557	* descriptors pointing to our own handlers.
558	*/
559	/** @todo not sure about IRET, may generate Trap 0d (\#GP), NEED TO CHECK! */
560	if ( pu8Code[0] == 0x9a /* CALL FAR */
561	\|\| ( pu8Code[0] == 0xff /* CALL FAR [] */
562	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x18)
563	\|\| pu8Code[0] == 0xea /* JMP FAR */
564	\|\| ( pu8Code[0] == 0xff /* JMP FAR [] */
565	&& (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x28)
566	\|\| pu8Code[0] == 0xcf /* IRET */
567	)
568	{
569	/*
570	* Got potential call to callgate.
571	* We simply return execution to the recompiler to do emulation
572	* starting from the instruction which caused the trap.
573	*/
574	pTrpmCpu->uActiveVector = ~0;
575	Log6(("TRPMGC0b: %Rrc (%04x:%08x) (CG)\n", VINF_EM_RAW_RING_SWITCH, pRegFrame->cs, pRegFrame->eip));
576	return VINF_EM_RAW_RING_SWITCH;
577	}
578	}
579
580	/*
581	* Pass trap 0b as is to the recompiler in all other cases.
582	*/
583	Log6(("TRPMGC0b: %Rrc (%04x:%08x)\n", VINF_EM_RAW_GUEST_TRAP, pRegFrame->cs, pRegFrame->eip));
584	return VINF_EM_RAW_GUEST_TRAP;
585	}
586
587
588	/**
589	* \#GP (General Protection Fault) handler for Ring-0 privileged instructions.
590	*
591	* @returns VBox status code.
592	* VINF_SUCCESS means we completely handled this trap,
593	* other codes are passed execution to host context.
594	*
595	* @param pVM The VM handle.
596	* @param pVCpu The virtual CPU handle.
597	* @param pRegFrame Pointer to the register frame for the trap.
598	* @param pCpu The opcode info.
599	* @param PC The program counter corresponding to cs:eip in pRegFrame.
600	*/
601	static int trpmGCTrap0dHandlerRing0(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
602	{
603	int rc;
604
605	/*
606	* Try handle it here, if not return to HC and emulate/interpret it there.
607	*/
608	switch (pCpu->pCurInstr->opcode)
609	{
610	case OP_INT3:
611	/*
612	* Little hack to make the code below not fail
613	*/
614	pCpu->param1.flags = USE_IMMEDIATE8;
615	pCpu->param1.parval = 3;
616	/* fallthru */
617	case OP_INT:
618	{
619	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
620	Assert(!(PATMIsPatchGCAddr(pVM, (RTRCPTR)PC)));
621	if (pCpu->param1.parval == 3)
622	{
623	/* Int 3 replacement patch? */
624	if (PATMHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS)
625	{
626	AssertFailed();
627	return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame);
628	}
629	}
630	rc = TRPMForwardTrap(pVCpu, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT, 0xd);
631	if (RT_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
632	return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame);
633
634	pVCpu->trpm.s.uActiveVector = (pVCpu->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
635	pVCpu->trpm.s.enmActiveType = TRPM_SOFTWARE_INT;
636	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
637	}
638
639	#ifdef PATM_EMULATE_SYSENTER
640	case OP_SYSEXIT:
641	case OP_SYSRET:
642	rc = PATMSysCall(pVM, pRegFrame, pCpu);
643	return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
644	#endif
645
646	case OP_HLT:
647	/* If it's in patch code, defer to ring-3. */
648	if (PATMIsPatchGCAddr(pVM, (RTRCPTR)PC))
649	break;
650
651	pRegFrame->eip += pCpu->opsize;
652	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_HALT, pRegFrame);
653
654
655	/*
656	* These instructions are used by PATM and CASM for finding
657	* dangerous non-trapping instructions. Thus, since all
658	* scanning and patching is done in ring-3 we'll have to
659	* return to ring-3 on the first encounter of these instructions.
660	*/
661	case OP_MOV_CR:
662	case OP_MOV_DR:
663	/* We can safely emulate control/debug register move instructions in patched code. */
664	if ( !PATMIsPatchGCAddr(pVM, (RTRCPTR)PC)
665	&& !CSAMIsKnownDangerousInstr(pVM, (RTRCPTR)PC))
666	break;
667	case OP_INVLPG:
668	case OP_LLDT:
669	case OP_STI:
670	case OP_RDTSC: /* just in case */
671	case OP_RDPMC:
672	case OP_CLTS:
673	case OP_WBINVD: /* nop */
674	case OP_RDMSR:
675	case OP_WRMSR:
676	{
677	uint32_t cbIgnored;
678	rc = EMInterpretInstructionCPU(pVM, pVCpu, pCpu, pRegFrame, PC, &cbIgnored);
679	if (RT_SUCCESS(rc))
680	pRegFrame->eip += pCpu->opsize;
681	else if (rc == VERR_EM_INTERPRETER)
682	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
683	return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
684	}
685	}
686
687	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EXCEPTION_PRIVILEGED, pRegFrame);
688	}
689
690
691	/**
692	* \#GP (General Protection Fault) handler for Ring-3.
693	*
694	* @returns VBox status code.
695	* VINF_SUCCESS means we completely handled this trap,
696	* other codes are passed execution to host context.
697	*
698	* @param pVM The VM handle.
699	* @param pVCpu The virtual CPU handle.
700	* @param pRegFrame Pointer to the register frame for the trap.
701	* @param pCpu The opcode info.
702	* @param PC The program counter corresponding to cs:eip in pRegFrame.
703	*/
704	static int trpmGCTrap0dHandlerRing3(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC)
705	{
706	int rc;
707	Assert(!pRegFrame->eflags.Bits.u1VM);
708
709	switch (pCpu->pCurInstr->opcode)
710	{
711	/*
712	* INT3 and INT xx are ring-switching.
713	* (The shadow IDT will have set the entries to DPL=0, that's why we're here.)
714	*/
715	case OP_INT3:
716	/*
717	* Little hack to make the code below not fail
718	*/
719	pCpu->param1.flags = USE_IMMEDIATE8;
720	pCpu->param1.parval = 3;
721	/* fall thru */
722	case OP_INT:
723	{
724	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
725	rc = TRPMForwardTrap(pVCpu, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT, 0xd);
726	if (RT_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP)
727	return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame);
728
729	pVCpu->trpm.s.uActiveVector = (pVCpu->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT;
730	pVCpu->trpm.s.enmActiveType = TRPM_SOFTWARE_INT;
731	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame);
732	}
733
734	/*
735	* SYSCALL, SYSENTER, INTO and BOUND are also ring-switchers.
736	*/
737	case OP_SYSCALL:
738	case OP_SYSENTER:
739	#ifdef PATM_EMULATE_SYSENTER
740	rc = PATMSysCall(pVM, pRegFrame, pCpu);
741	if (rc == VINF_SUCCESS)
742	return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame);
743	/* else no break; */
744	#endif
745	case OP_BOUND:
746	case OP_INTO:
747	pVCpu->trpm.s.uActiveVector = ~0;
748	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_RING_SWITCH, pRegFrame);
749
750	/*
751	* Handle virtualized TSC & PMC reads, just in case.
752	*/
753	case OP_RDTSC:
754	case OP_RDPMC:
755	{
756	uint32_t cbIgnored;
757	rc = EMInterpretInstructionCPU(pVM, pVCpu, pCpu, pRegFrame, PC, &cbIgnored);
758	if (RT_SUCCESS(rc))
759	pRegFrame->eip += pCpu->opsize;
760	else if (rc == VERR_EM_INTERPRETER)
761	rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED;
762	return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
763	}
764
765	/*
766	* STI and CLI are I/O privileged, i.e. if IOPL
767	*/
768	case OP_STI:
769	case OP_CLI:
770	{
771	uint32_t efl = CPUMRawGetEFlags(pVCpu, pRegFrame);
772	if (X86_EFL_GET_IOPL(efl) >= (unsigned)(pRegFrame->ss & X86_SEL_RPL))
773	{
774	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n"));
775	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RESCHEDULE_REM, pRegFrame);
776	}
777	LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0)\n"));
778	break;
779	}
780	}
781
782	/*
783	* A genuine guest fault.
784	*/
785	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_GUEST_TRAP, pRegFrame);
786	}
787
788
789	/**
790	* Emulates RDTSC for the \#GP handler.
791	*
792	* @returns VINF_SUCCESS or VINF_EM_RAW_EMULATE_INSTR.
793	*
794	* @param pVM Pointer to the shared VM structure.
795	* @param pVCpu The virtual CPU handle.
796	* @param pRegFrame Pointer to the registre frame for the trap.
797	* This will be updated on successful return.
798	*/
799	DECLINLINE(int) trpmGCTrap0dHandlerRdTsc(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame)
800	{
801	STAM_COUNTER_INC(&pVM->trpm.s.StatTrap0dRdTsc);
802
803	if (CPUMGetGuestCR4(pVCpu) & X86_CR4_TSD)
804	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); /* will trap (optimize later). */
805
806	uint64_t uTicks = TMCpuTickGet(pVCpu);
807	pRegFrame->eax = uTicks;
808	pRegFrame->edx = uTicks >> 32;
809	pRegFrame->eip += 2;
810	return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame);
811	}
812
813
814	/**
815	* \#GP (General Protection Fault) handler.
816	*
817	* @returns VBox status code.
818	* VINF_SUCCESS means we completely handled this trap,
819	* other codes are passed execution to host context.
820	*
821	* @param pVM The VM handle.
822	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
823	* @param pRegFrame Pointer to the register frame for the trap.
824	*/
825	static int trpmGCTrap0dHandler(PVM pVM, PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
826	{
827	LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%08RX32 uErr=%RGv\n", pRegFrame->ss, pRegFrame->eip, pTrpmCpu->uActiveErrorCode));
828	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
829
830	/*
831	* Convert and validate CS.
832	*/
833	STAM_PROFILE_START(&pVM->trpm.s.StatTrap0dDisasm, a);
834	RTGCPTR PC;
835	uint32_t cBits;
836	int rc = SELMValidateAndConvertCSAddrGCTrap(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs,
837	(RTGCPTR)pRegFrame->eip, &PC, &cBits);
838	if (RT_FAILURE(rc))
839	{
840	Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Rrc !!\n",
841	pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc));
842	STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
843	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
844	}
845
846	/*
847	* Optimize RDTSC traps.
848	* Some guests (like Solaris) are using RDTSC all over the place and
849	* will end up trapping a lot because of that.
850	*/
851	if ( !pRegFrame->eflags.Bits.u1VM
852	&& ((uint8_t *)PC)[0] == 0x0f
853	&& ((uint8_t *)PC)[1] == 0x31)
854	{
855	STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
856	return trpmGCTrap0dHandlerRdTsc(pVM, pVCpu, pRegFrame);
857	}
858
859	/*
860	* Disassemble the instruction.
861	*/
862	DISCPUSTATE Cpu;
863	uint32_t cbOp;
864	rc = DISCoreOneEx((RTGCUINTPTR)PC, cBits == 32 ? CPUMODE_32BIT : cBits == 16 ? CPUMODE_16BIT : CPUMODE_64BIT,
865	NULL, NULL, &Cpu, &cbOp);
866	if (RT_FAILURE(rc))
867	{
868	AssertMsgFailed(("DISCoreOneEx failed to PC=%RGv rc=%Rrc\n", PC, rc));
869	STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
870	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
871	}
872	STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a);
873
874	/*
875	* Deal with I/O port access.
876	*/
877	if ( pVCpu->trpm.s.uActiveErrorCode == 0
878	&& (Cpu.pCurInstr->optype & OPTYPE_PORTIO))
879	{
880	VBOXSTRICTRC rcStrict = EMInterpretPortIO(pVM, pVCpu, pRegFrame, &Cpu, cbOp);
881	rc = VBOXSTRICTRC_TODO(rcStrict);
882	return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
883	}
884
885	/*
886	* Deal with Ring-0 (privileged instructions)
887	*/
888	if ( (pRegFrame->ss & X86_SEL_RPL) <= 1
889	&& !pRegFrame->eflags.Bits.u1VM)
890	return trpmGCTrap0dHandlerRing0(pVM, pVCpu, pRegFrame, &Cpu, PC);
891
892	/*
893	* Deal with Ring-3 GPs.
894	*/
895	if (!pRegFrame->eflags.Bits.u1VM)
896	return trpmGCTrap0dHandlerRing3(pVM, pVCpu, pRegFrame, &Cpu, PC);
897
898	/*
899	* Deal with v86 code.
900	*
901	* We always set IOPL to zero which makes e.g. pushf fault in V86
902	* mode. The guest might use IOPL=3 and therefore not expect a #GP.
903	* Simply fall back to the recompiler to emulate this instruction if
904	* that's the case. To get the correct we must use CPUMRawGetEFlags.
905	*/
906	X86EFLAGS eflags;
907	eflags.u32 = CPUMRawGetEFlags(pVCpu, pRegFrame); /* Get the correct value. */
908	Log3(("TRPM #GP V86: cs:eip=%04x:%08x IOPL=%d efl=%08x\n", pRegFrame->cs, pRegFrame->eip, eflags.Bits.u2IOPL, eflags.u));
909	if (eflags.Bits.u2IOPL != 3)
910	{
911	Assert(eflags.Bits.u2IOPL == 0);
912
913	rc = TRPMForwardTrap(pVCpu, pRegFrame, 0xD, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP, 0xd);
914	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
915	return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
916	}
917	return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame);
918	}
919
920
921	/**
922	* \#GP (General Protection Fault) handler.
923	*
924	* @returns VBox status code.
925	* VINF_SUCCESS means we completely handled this trap,
926	* other codes are passed execution to host context.
927	*
928	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
929	* @param pRegFrame Pointer to the register frame for the trap.
930	* @internal
931	*/
932	DECLASM(int) TRPMGCTrap0dHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
933	{
934	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
935	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
936
937	LogFlow(("TRPMGC0d: %04x:%08x err=%x\n", pRegFrame->cs, pRegFrame->eip, (uint32_t)pVCpu->trpm.s.uActiveErrorCode));
938
939	int rc = trpmGCTrap0dHandler(pVM, pTrpmCpu, pRegFrame);
940	switch (rc)
941	{
942	case VINF_EM_RAW_GUEST_TRAP:
943	case VINF_EM_RAW_EXCEPTION_PRIVILEGED:
944	if (PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip))
945	rc = VINF_PATM_PATCH_TRAP_GP;
946	break;
947
948	case VINF_EM_RAW_INTERRUPT_PENDING:
949	Assert(TRPMHasTrap(pVCpu));
950	/* no break; */
951	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
952	case VINF_EM_RAW_EMULATE_INSTR:
953	case VINF_IOM_HC_IOPORT_READ:
954	case VINF_IOM_HC_IOPORT_WRITE:
955	case VINF_IOM_HC_MMIO_WRITE:
956	case VINF_IOM_HC_MMIO_READ:
957	case VINF_IOM_HC_MMIO_READ_WRITE:
958	case VINF_PATM_PATCH_INT3:
959	case VINF_EM_NO_MEMORY:
960	case VINF_EM_RAW_TO_R3:
961	case VINF_EM_RAW_TIMER_PENDING:
962	case VINF_EM_PENDING_REQUEST:
963	case VINF_EM_HALT:
964	case VINF_SUCCESS:
965	break;
966
967	default:
968	AssertMsg(PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip) == false, ("return code %d\n", rc));
969	break;
970	}
971	Log6(("TRPMGC0d: %Rrc (%04x:%08x)\n", rc, pRegFrame->cs, pRegFrame->eip));
972	return rc;
973	}
974
975
976	/**
977	* \#PF (Page Fault) handler.
978	*
979	* Calls PGM which does the actual handling.
980	*
981	*
982	* @returns VBox status code.
983	* VINF_SUCCESS means we completely handled this trap,
984	* other codes are passed execution to host context.
985	*
986	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
987	* @param pRegFrame Pointer to the register frame for the trap.
988	* @internal
989	*/
990	DECLASM(int) TRPMGCTrap0eHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
991	{
992	PVM pVM = TRPMCPU_2_VM(pTrpmCpu);
993	PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu);
994
995	LogFlow(("TRPMGC0e: %04x:%08x err=%x cr2=%08x\n", pRegFrame->cs, pRegFrame->eip, (uint32_t)pVCpu->trpm.s.uActiveErrorCode, (uint32_t)pVCpu->trpm.s.uActiveCR2));
996
997	/*
998	* This is all PGM stuff.
999	*/
1000	int rc = PGMTrap0eHandler(pVCpu, pVCpu->trpm.s.uActiveErrorCode, pRegFrame, (RTGCPTR)pVCpu->trpm.s.uActiveCR2);
1001	switch (rc)
1002	{
1003	case VINF_EM_RAW_EMULATE_INSTR:
1004	case VINF_EM_RAW_EMULATE_INSTR_PD_FAULT:
1005	case VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT:
1006	case VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT:
1007	case VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT:
1008	case VINF_EM_RAW_EMULATE_INSTR_IDT_FAULT:
1009	if (PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip))
1010	rc = VINF_PATCH_EMULATE_INSTR;
1011	break;
1012
1013	case VINF_EM_RAW_GUEST_TRAP:
1014	if (PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip))
1015	return VINF_PATM_PATCH_TRAP_PF;
1016
1017	rc = TRPMForwardTrap(pVCpu, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP, 0xe);
1018	Assert(rc == VINF_EM_RAW_GUEST_TRAP);
1019	break;
1020
1021	case VINF_EM_RAW_INTERRUPT_PENDING:
1022	Assert(TRPMHasTrap(pVCpu));
1023	/* no break; */
1024	case VINF_IOM_HC_MMIO_READ:
1025	case VINF_IOM_HC_MMIO_WRITE:
1026	case VINF_IOM_HC_MMIO_READ_WRITE:
1027	case VINF_PATM_HC_MMIO_PATCH_READ:
1028	case VINF_PATM_HC_MMIO_PATCH_WRITE:
1029	case VINF_SUCCESS:
1030	case VINF_EM_RAW_TO_R3:
1031	case VINF_EM_PENDING_REQUEST:
1032	case VINF_EM_RAW_TIMER_PENDING:
1033	case VINF_EM_NO_MEMORY:
1034	case VINF_CSAM_PENDING_ACTION:
1035	case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */
1036	break;
1037
1038	default:
1039	AssertMsg(PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip));
1040	break;
1041	}
1042	rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame);
1043	Log6(("TRPMGC0e: %Rrc (%04x:%08x)\n", rc, pRegFrame->cs, pRegFrame->eip));
1044	return rc;
1045	}
1046
1047
1048	/**
1049	* Scans for the EIP in the specified array of trap handlers.
1050	*
1051	* If we don't fine the EIP, we'll panic.
1052	*
1053	* @returns VBox status code.
1054	*
1055	* @param pVM The VM handle.
1056	* @param pRegFrame Pointer to the register frame for the trap.
1057	* @param paHandlers The array of trap handler records.
1058	* @param pEndRecord The end record (exclusive).
1059	*/
1060	static int trpmGCHyperGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, PCTRPMGCHYPER paHandlers, PCTRPMGCHYPER pEndRecord)
1061	{
1062	uintptr_t uEip = (uintptr_t)pRegFrame->eip;
1063	Assert(paHandlers <= pEndRecord);
1064
1065	Log(("trpmGCHyperGeneric: uEip=%x %p-%p\n", uEip, paHandlers, pEndRecord));
1066
1067	#if 0 /// @todo later
1068	/*
1069	* Start by doing a kind of binary search.
1070	*/
1071	unsigned iStart = 0;
1072	unsigned iEnd = pEndRecord - paHandlers;
1073	unsigned i = iEnd / 2;
1074	#endif
1075
1076	/*
1077	* Do a linear search now (in case the array wasn't properly sorted).
1078	*/
1079	for (PCTRPMGCHYPER pCur = paHandlers; pCur < pEndRecord; pCur++)
1080	{
1081	if ( pCur->uStartEIP <= uEip
1082	&& (pCur->uEndEIP ? pCur->uEndEIP > uEip : pCur->uStartEIP == uEip))
1083	return pCur->pfnHandler(pVM, pRegFrame, pCur->uUser);
1084	}
1085
1086	return VERR_TRPM_DONT_PANIC;
1087	}
1088
1089
1090	/**
1091	* Hypervisor \#NP ((segment) Not Present) handler.
1092	*
1093	* Scans for the EIP in the registered trap handlers.
1094	*
1095	* @returns VBox status code.
1096	* VINF_SUCCESS means we completely handled this trap,
1097	* other codes are passed back to host context.
1098	*
1099	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
1100	* @param pRegFrame Pointer to the register frame for the trap.
1101	* @internal
1102	*/
1103	DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
1104	{
1105	return trpmGCHyperGeneric(TRPMCPU_2_VM(pTrpmCpu), pRegFrame, g_aTrap0bHandlers, g_aTrap0bHandlersEnd);
1106	}
1107
1108
1109	/**
1110	* Hypervisor \#GP (General Protection Fault) handler.
1111	*
1112	* Scans for the EIP in the registered trap handlers.
1113	*
1114	* @returns VBox status code.
1115	* VINF_SUCCESS means we completely handled this trap,
1116	* other codes are passed back to host context.
1117	*
1118	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
1119	* @param pRegFrame Pointer to the register frame for the trap.
1120	* @internal
1121	*/
1122	DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
1123	{
1124	return trpmGCHyperGeneric(TRPMCPU_2_VM(pTrpmCpu), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1125	}
1126
1127
1128	/**
1129	* Hypervisor \#PF (Page Fault) handler.
1130	*
1131	* Scans for the EIP in the registered trap handlers.
1132	*
1133	* @returns VBox status code.
1134	* VINF_SUCCESS means we completely handled this trap,
1135	* other codes are passed back to host context.
1136	*
1137	* @param pTrpmCpu Pointer to TRPMCPU data (within VM).
1138	* @param pRegFrame Pointer to the register frame for the trap.
1139	* @internal
1140	*/
1141	DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame)
1142	{
1143	return trpmGCHyperGeneric(TRPMCPU_2_VM(pTrpmCpu), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd);
1144	}
1145
1146
1147	/**
1148	* Deal with hypervisor traps occuring when resuming execution on a trap.
1149	*
1150	* @returns VBox status code.
1151	* @param pVM The VM handle.
1152	* @param pRegFrame Register frame.
1153	* @param uUser User arg.
1154	*/
1155	DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
1156	{
1157	Log(("********************************************************\n"));
1158	Log(("trpmGCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
1159	Log(("********************************************************\n"));
1160
1161	if (uUser & TRPM_TRAP_IN_HYPER)
1162	{
1163	/*
1164	* Check that there is still some stack left, if not we'll flag
1165	* a guru meditation (the alternative is a triple fault).
1166	*/
1167	RTRCUINTPTR cbStackUsed = (RTRCUINTPTR)VMMGetStackRC(pVM) - pRegFrame->esp;
1168	if (cbStackUsed > VMM_STACK_SIZE - _1K)
1169	{
1170	LogRel(("trpmGCTrapInGeneric: ran out of stack: esp=#x cbStackUsed=%#x\n", pRegFrame->esp, cbStackUsed));
1171	return VERR_TRPM_DONT_PANIC;
1172	}
1173
1174	/*
1175	* Just zero the register containing the selector in question.
1176	* We'll deal with the actual stale or troublesome selector value in
1177	* the outermost trap frame.
1178	*/
1179	switch (uUser & TRPM_TRAP_IN_OP_MASK)
1180	{
1181	case TRPM_TRAP_IN_MOV_GS:
1182	pRegFrame->eax = 0;
1183	pRegFrame->gs = 0; /* prevent recursive trouble. */
1184	break;
1185	case TRPM_TRAP_IN_MOV_FS:
1186	pRegFrame->eax = 0;
1187	pRegFrame->fs = 0; /* prevent recursive trouble. */
1188	return VINF_SUCCESS;
1189
1190	default:
1191	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1192	return VERR_INTERNAL_ERROR;
1193	}
1194	}
1195	else
1196	{
1197	/*
1198	* Reconstruct the guest context and switch to the recompiler.
1199	* We ASSUME we're only at
1200	*/
1201	CPUMCTXCORE CtxCore = *pRegFrame;
1202	uint32_t pEsp = (uint32_t )pRegFrame->esp;
1203	int rc;
1204
1205	switch (uUser)
1206	{
1207	/*
1208	* This will only occur when resuming guest code in a trap handler!
1209	*/
1210	/* @note ASSUMES esp points to the temporary guest CPUMCTXCORE!!! */
1211	case TRPM_TRAP_IN_MOV_GS:
1212	case TRPM_TRAP_IN_MOV_FS:
1213	case TRPM_TRAP_IN_MOV_ES:
1214	case TRPM_TRAP_IN_MOV_DS:
1215	{
1216	PCPUMCTXCORE pTempGuestCtx = (PCPUMCTXCORE)pEsp;
1217
1218	/* Just copy the whole thing; several selector registers, eip (etc) and eax are not yet in pRegFrame. */
1219	CtxCore = *pTempGuestCtx;
1220	rc = VINF_EM_RAW_STALE_SELECTOR;
1221	break;
1222	}
1223
1224	/*
1225	* This will only occur when resuming guest code!
1226	*/
1227	case TRPM_TRAP_IN_IRET:
1228	CtxCore.eip = *pEsp++;
1229	CtxCore.cs = (RTSEL)*pEsp++;
1230	CtxCore.eflags.u32 = *pEsp++;
1231	CtxCore.esp = *pEsp++;
1232	CtxCore.ss = (RTSEL)*pEsp++;
1233	rc = VINF_EM_RAW_IRET_TRAP;
1234	break;
1235
1236	/*
1237	* This will only occur when resuming V86 guest code!
1238	*/
1239	case TRPM_TRAP_IN_IRET \| TRPM_TRAP_IN_V86:
1240	CtxCore.eip = *pEsp++;
1241	CtxCore.cs = (RTSEL)*pEsp++;
1242	CtxCore.eflags.u32 = *pEsp++;
1243	CtxCore.esp = *pEsp++;
1244	CtxCore.ss = (RTSEL)*pEsp++;
1245	CtxCore.es = (RTSEL)*pEsp++;
1246	CtxCore.ds = (RTSEL)*pEsp++;
1247	CtxCore.fs = (RTSEL)*pEsp++;
1248	CtxCore.gs = (RTSEL)*pEsp++;
1249	rc = VINF_EM_RAW_IRET_TRAP;
1250	break;
1251
1252	default:
1253	AssertMsgFailed(("Invalid uUser=%#x\n", uUser));
1254	return VERR_INTERNAL_ERROR;
1255	}
1256
1257
1258	CPUMSetGuestCtxCore(VMMGetCpu0(pVM), &CtxCore);
1259	TRPMGCHyperReturnToHost(pVM, rc);
1260	}
1261
1262	AssertMsgFailed(("Impossible!\n"));
1263	return VERR_INTERNAL_ERROR;
1264	}
1265

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source: vbox/trunk/src/VBox/VMM/VMMGC/TRPMGCHandlers.cpp@ 25252

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