PATMRC.cpp@ 44876

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1	/* $Id: PATMRC.cpp 44363 2013-01-24 22:33:41Z vboxsync $ */
2	/** @file
3	* PATM - Dynamic Guest OS Patching Manager - Raw-mode Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 Oracle Corporation
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
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_PATM
23	#include <VBox/vmm/patm.h>
24	#include <VBox/vmm/cpum.h>
25	#include <VBox/vmm/stam.h>
26	#include <VBox/vmm/pgm.h>
27	#include <VBox/vmm/mm.h>
28	#include <VBox/vmm/em.h>
29	#ifdef VBOX_WITH_IEM
30	# include <VBox/vmm/iem.h>
31	#endif
32	#include <VBox/vmm/selm.h>
33	#include <VBox/vmm/mm.h>
34	#include "PATMInternal.h"
35	#include "PATMA.h"
36	#include <VBox/vmm/vm.h>
37	#include <VBox/dbg.h>
38	#include <VBox/dis.h>
39	#include <VBox/disopcode.h>
40	#include <VBox/err.h>
41	#include <VBox/log.h>
42	#include <iprt/assert.h>
43	#include <iprt/asm.h>
44	#include <iprt/string.h>
45
46
47	/**
48	* \#PF Virtual Handler callback for Guest access a page monitored by PATM
49	*
50	* @returns VBox status code (appropriate for trap handling and GC return).
51	* @param pVM Pointer to the VM.
52	* @param uErrorCode CPU Error code.
53	* @param pRegFrame Trap register frame.
54	* @param pvFault The fault address (cr2).
55	* @param pvRange The base address of the handled virtual range.
56	* @param offRange The offset of the access into this range.
57	* (If it's a EIP range this is the EIP, if not it's pvFault.)
58	*/
59	VMMRCDECL(int) PATMGCMonitorPage(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
60	{
61	NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
62	pVM->patm.s.pvFaultMonitor = (RTRCPTR)(RTRCUINTPTR)pvFault;
63	return VINF_PATM_CHECK_PATCH_PAGE;
64	}
65
66
67	/**
68	* Checks if the write is located on a page with was patched before.
69	* (if so, then we are not allowed to turn on r/w)
70	*
71	* @returns VBox status
72	* @param pVM Pointer to the VM.
73	* @param pRegFrame CPU context
74	* @param GCPtr GC pointer to write address
75	* @param cbWrite Nr of bytes to write
76	*
77	*/
78	VMMRC_INT_DECL(int) PATMRCHandleWriteToPatchPage(PVM pVM, PCPUMCTXCORE pRegFrame, RTRCPTR GCPtr, uint32_t cbWrite)
79	{
80	RTGCUINTPTR pWritePageStart, pWritePageEnd;
81	PPATMPATCHPAGE pPatchPage;
82
83	/* Quick boundary check */
84	if ( PAGE_ADDRESS(GCPtr) < PAGE_ADDRESS(pVM->patm.s.pPatchedInstrGCLowest)
85	\|\| PAGE_ADDRESS(GCPtr) > PAGE_ADDRESS(pVM->patm.s.pPatchedInstrGCHighest)
86	)
87	return VERR_PATCH_NOT_FOUND;
88
89	STAM_PROFILE_ADV_START(&pVM->patm.s.StatPatchWriteDetect, a);
90
91	pWritePageStart = (RTRCUINTPTR)GCPtr & PAGE_BASE_GC_MASK;
92	pWritePageEnd = ((RTRCUINTPTR)GCPtr + cbWrite - 1) & PAGE_BASE_GC_MASK;
93
94	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (AVLOU32KEY)pWritePageStart);
95	if ( !pPatchPage
96	&& pWritePageStart != pWritePageEnd
97	)
98	{
99	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (AVLOU32KEY)pWritePageEnd);
100	}
101
102	#ifdef LOG_ENABLED
103	if (pPatchPage)
104	Log(("PATMGCHandleWriteToPatchPage: Found page %RRv for write to %RRv %d bytes (page low:high %RRv:%RRv\n", pPatchPage->Core.Key, GCPtr, cbWrite, pPatchPage->pLowestAddrGC, pPatchPage->pHighestAddrGC));
105	#endif
106
107	if (pPatchPage)
108	{
109	if ( pPatchPage->pLowestAddrGC > (RTRCPTR)((RTRCUINTPTR)GCPtr + cbWrite - 1)
110	\|\| pPatchPage->pHighestAddrGC < (RTRCPTR)GCPtr)
111	{
112	/* This part of the page was not patched; try to emulate the instruction. */
113	LogFlow(("PATMHandleWriteToPatchPage: Interpret %x accessing %RRv\n", pRegFrame->eip, GCPtr));
114	int rc = EMInterpretInstruction(VMMGetCpu0(pVM), pRegFrame, (RTGCPTR)(RTRCUINTPTR)GCPtr);
115	if (rc == VINF_SUCCESS)
116	{
117	STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpreted);
118	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
119	return VINF_SUCCESS;
120	}
121	STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpretedFailed);
122	}
123	R3PTRTYPE(PPATCHINFO) paPatch = (R3PTRTYPE(PPATCHINFO) )MMHyperR3ToRC(pVM, pPatchPage->papPatch);
124
125	/* Increase the invalid write counter for each patch that's registered for that page. */
126	for (uint32_t i=0;i<pPatchPage->cCount;i++)
127	{
128	PPATCHINFO pPatch = (PPATCHINFO)MMHyperR3ToRC(pVM, paPatch[i]);
129
130	pPatch->cInvalidWrites++;
131	}
132
133	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
134	return VINF_EM_RAW_EMULATE_INSTR;
135	}
136
137	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
138	return VERR_PATCH_NOT_FOUND;
139	}
140
141
142	/**
143	* Checks if the illegal instruction was caused by a patched instruction
144	*
145	* @returns VBox status
146	*
147	* @param pVM Pointer to the VM.
148	* @param pCtxCore The relevant core context.
149	*/
150	VMMRC_INT_DECL(int) PATMRCHandleIllegalInstrTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
151	{
152	PPATMPATCHREC pRec;
153	PVMCPU pVCpu = VMMGetCpu0(pVM);
154	int rc;
155
156	/* Very important check -> otherwise we have a security leak. */
157	AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss.Sel & X86_SEL_RPL) == 1, VERR_ACCESS_DENIED);
158	Assert(PATMIsPatchGCAddr(pVM, pRegFrame->eip));
159
160	/* OP_ILLUD2 in PATM generated code? */
161	if (CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
162	{
163	LogFlow(("PATMRC: Pending action %x at %x\n", CTXSUFF(pVM->patm.s.pGCState)->uPendingAction, pRegFrame->eip));
164
165	/* Private PATM interface (@todo hack due to lack of anything generic). */
166	/* Parameters:
167	* eax = Pending action (currently PATM_ACTION_LOOKUP_ADDRESS)
168	* ecx = PATM_ACTION_MAGIC
169	*/
170	if ( (pRegFrame->eax & CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
171	&& pRegFrame->ecx == PATM_ACTION_MAGIC
172	)
173	{
174	CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
175
176	switch (pRegFrame->eax)
177	{
178	case PATM_ACTION_LOOKUP_ADDRESS:
179	{
180	/* Parameters:
181	* edx = GC address to find
182	* edi = PATCHJUMPTABLE ptr
183	*/
184	AssertMsg(!pRegFrame->edi \|\| PATMIsPatchGCAddr(pVM, pRegFrame->edi), ("edi = %x\n", pRegFrame->edi));
185
186	Log(("PATMRC: lookup %x jump table=%x\n", pRegFrame->edx, pRegFrame->edi));
187
188	pRec = patmQueryFunctionPatch(pVM, (RTRCPTR)pRegFrame->edx);
189	if (pRec)
190	{
191	if (pRec->patch.uState == PATCH_ENABLED)
192	{
193	RTGCUINTPTR pRelAddr = pRec->patch.pPatchBlockOffset; /* make it relative */
194	rc = patmAddBranchToLookupCache(pVM, (RTRCPTR)pRegFrame->edi, (RTRCPTR)pRegFrame->edx, pRelAddr);
195	if (rc == VINF_SUCCESS)
196	{
197	Log(("Patch block %RRv called as function\n", pRec->patch.pPrivInstrGC));
198	pRec->patch.flags \|= PATMFL_CODE_REFERENCED;
199
200	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
201	pRegFrame->eax = pRelAddr;
202	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionFound);
203	return VINF_SUCCESS;
204	}
205	AssertFailed();
206	}
207	else
208	{
209	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
210	pRegFrame->eax = 0; /* make it fault */
211	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
212	return VINF_SUCCESS;
213	}
214	}
215	else
216	{
217	/* Check first before trying to generate a function/trampoline patch. */
218	if (pVM->patm.s.fOutOfMemory)
219	{
220	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
221	pRegFrame->eax = 0; /* make it fault */
222	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
223	return VINF_SUCCESS;
224	}
225	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
226	return VINF_PATM_DUPLICATE_FUNCTION;
227	}
228	}
229
230	case PATM_ACTION_DISPATCH_PENDING_IRQ:
231	/* Parameters:
232	* edi = GC address to jump to
233	*/
234	Log(("PATMRC: Dispatch pending interrupt; eip=%x->%x\n", pRegFrame->eip, pRegFrame->edi));
235
236	/* Change EIP to the guest address the patch would normally jump to after setting IF. */
237	pRegFrame->eip = pRegFrame->edi;
238
239	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX\|PATM_RESTORE_EDI));
240	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
241
242	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
243	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
244	pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
245
246	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
247
248	/* We are no longer executing PATM code; set PIF again. */
249	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
250
251	STAM_COUNTER_INC(&pVM->patm.s.StatCheckPendingIRQ);
252
253	/* The caller will call trpmGCExitTrap, which will dispatch pending interrupts for us. */
254	return VINF_SUCCESS;
255
256	case PATM_ACTION_PENDING_IRQ_AFTER_IRET:
257	/* Parameters:
258	* edi = GC address to jump to
259	*/
260	Log(("PATMRC: Dispatch pending interrupt (iret); eip=%x->%x\n", pRegFrame->eip, pRegFrame->edi));
261	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX\|PATM_RESTORE_EDI));
262	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
263
264	/* Change EIP to the guest address of the iret. */
265	pRegFrame->eip = pRegFrame->edi;
266
267	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
268	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
269	pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
270	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
271
272	/* We are no longer executing PATM code; set PIF again. */
273	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
274
275	return VINF_PATM_PENDING_IRQ_AFTER_IRET;
276
277	case PATM_ACTION_DO_V86_IRET:
278	{
279	Log(("PATMRC: Do iret to V86 code; eip=%x\n", pRegFrame->eip));
280	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX));
281	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
282
283	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
284	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
285	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
286
287	rc = EMInterpretIretV86ForPatm(pVM, pVCpu, pRegFrame);
288	if (RT_SUCCESS(rc))
289	{
290	STAM_COUNTER_INC(&pVM->patm.s.StatEmulIret);
291
292	/* We are no longer executing PATM code; set PIF again. */
293	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
294	PGMRZDynMapReleaseAutoSet(pVCpu);
295	CPUMGCCallV86Code(pRegFrame);
296	/* does not return */
297	}
298	else
299	STAM_COUNTER_INC(&pVM->patm.s.StatEmulIretFailed);
300	return rc;
301	}
302
303	#ifdef DEBUG
304	case PATM_ACTION_LOG_CLI:
305	Log(("PATMRC: CLI at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags) ));
306	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
307	return VINF_SUCCESS;
308
309	case PATM_ACTION_LOG_STI:
310	Log(("PATMRC: STI at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags) ));
311	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
312	return VINF_SUCCESS;
313
314	case PATM_ACTION_LOG_POPF_IF1:
315	Log(("PATMRC: POPF setting IF at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
316	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
317	return VINF_SUCCESS;
318
319	case PATM_ACTION_LOG_POPF_IF0:
320	Log(("PATMRC: POPF at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
321	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
322	return VINF_SUCCESS;
323
324	case PATM_ACTION_LOG_PUSHF:
325	Log(("PATMRC: PUSHF at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags) ));
326	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
327	return VINF_SUCCESS;
328
329	case PATM_ACTION_LOG_IF1:
330	Log(("PATMRC: IF=1 escape from %x\n", pRegFrame->eip));
331	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
332	return VINF_SUCCESS;
333
334	case PATM_ACTION_LOG_IRET:
335	{
336	char pIretFrame = (char )pRegFrame->edx;
337	uint32_t eip, selCS, uEFlags;
338
339	rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
340	rc \|= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
341	rc \|= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
342	if (rc == VINF_SUCCESS)
343	{
344	if ( (uEFlags & X86_EFL_VM)
345	\|\| (selCS & X86_SEL_RPL) == 3)
346	{
347	uint32_t selSS, esp;
348
349	rc \|= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
350	rc \|= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
351
352	if (uEFlags & X86_EFL_VM)
353	{
354	uint32_t selDS, selES, selFS, selGS;
355	rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
356	rc \|= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
357	rc \|= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
358	rc \|= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
359	if (rc == VINF_SUCCESS)
360	{
361	Log(("PATMRC: IRET->VM stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
362	Log(("PATMRC: IRET->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
363	}
364	}
365	else
366	Log(("PATMRC: IRET stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
367	}
368	else
369	Log(("PATMRC: IRET stack frame: return address %04X:%x eflags=%08x\n", selCS, eip, uEFlags));
370	}
371	Log(("PATMRC: IRET from %x (IF->1) current eflags=%x\n", pRegFrame->eip, pVM->patm.s.CTXSUFF(pGCState)->uVMFlags));
372	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
373	return VINF_SUCCESS;
374	}
375
376	case PATM_ACTION_LOG_GATE_ENTRY:
377	{
378	char pIretFrame = (char )pRegFrame->edx;
379	uint32_t eip, selCS, uEFlags;
380
381	rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
382	rc \|= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
383	rc \|= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
384	if (rc == VINF_SUCCESS)
385	{
386	if ( (uEFlags & X86_EFL_VM)
387	\|\| (selCS & X86_SEL_RPL) == 3)
388	{
389	uint32_t selSS, esp;
390
391	rc \|= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
392	rc \|= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
393
394	if (uEFlags & X86_EFL_VM)
395	{
396	uint32_t selDS, selES, selFS, selGS;
397	rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
398	rc \|= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
399	rc \|= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
400	rc \|= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
401	if (rc == VINF_SUCCESS)
402	{
403	Log(("PATMRC: GATE->VM stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
404	Log(("PATMRC: GATE->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
405	}
406	}
407	else
408	Log(("PATMRC: GATE stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
409	}
410	else
411	Log(("PATMRC: GATE stack frame: return address %04X:%x eflags=%08x\n", selCS, eip, uEFlags));
412	}
413	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
414	return VINF_SUCCESS;
415	}
416
417	case PATM_ACTION_LOG_RET:
418	Log(("PATMRC: RET from %x to %x ESP=%x iopl=%d\n", pRegFrame->eip, pRegFrame->edx, pRegFrame->ebx, X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
419	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
420	return VINF_SUCCESS;
421
422	case PATM_ACTION_LOG_CALL:
423	Log(("PATMRC: CALL to %RRv return addr %RRv ESP=%x iopl=%d\n", pVM->patm.s.CTXSUFF(pGCState)->GCCallPatchTargetAddr, pVM->patm.s.CTXSUFF(pGCState)->GCCallReturnAddr, pRegFrame->edx, X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
424	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
425	return VINF_SUCCESS;
426	#endif
427	default:
428	AssertFailed();
429	break;
430	}
431	}
432	else
433	AssertFailed();
434	CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
435	}
436	AssertMsgFailed(("Unexpected OP_ILLUD2 in patch code at %x (pending action %x)!!!!\n", pRegFrame->eip, CTXSUFF(pVM->patm.s.pGCState)->uPendingAction));
437	return VINF_EM_RAW_EMULATE_INSTR;
438	}
439
440	/**
441	* Checks if the int 3 was caused by a patched instruction
442	*
443	* @returns Strict VBox status, includes all statuses that
444	* EMInterpretInstructionDisasState and
445	* @retval VINF_SUCCESS
446	* @retval VINF_PATM_PATCH_INT3
447	* @retval VINF_EM_RAW_EMULATE_INSTR
448	*
449	* @param pVM Pointer to the VM.
450	* @param pCtxCore The relevant core context.
451	*/
452	VMMRC_INT_DECL(int) PATMRCHandleInt3PatchTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
453	{
454	PPATMPATCHREC pRec;
455	int rc;
456
457	AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss.Sel & X86_SEL_RPL) == 1, VERR_ACCESS_DENIED);
458
459	/* Int 3 in PATM generated code? (most common case) */
460	if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
461	{
462	/* Note! Hardcoded assumption about it being a single byte int 3 instruction. */
463	pRegFrame->eip--;
464	return VINF_PATM_PATCH_INT3;
465	}
466
467	/** @todo could use simple caching here to speed things up. */
468	pRec = (PPATMPATCHREC)RTAvloU32Get(&CTXSUFF(pVM->patm.s.PatchLookupTree)->PatchTree, (AVLOU32KEY)(pRegFrame->eip - 1)); /* eip is pointing to the instruction after 'int 3' already */
469	if (pRec && pRec->patch.uState == PATCH_ENABLED)
470	{
471	if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT_BLOCK)
472	{
473	Assert(pRec->patch.opcode == OP_CLI);
474	/* This is a special cli block that was turned into an int 3 patch. We jump to the generated code manually. */
475	pRegFrame->eip = (uint32_t)PATCHCODE_PTR_GC(&pRec->patch);
476	STAM_COUNTER_INC(&pVM->patm.s.StatInt3BlockRun);
477	return VINF_SUCCESS;
478	}
479	if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT)
480	{
481	/* eip is pointing to the instruction after 'int 3' already */
482	pRegFrame->eip = pRegFrame->eip - 1;
483
484	PATM_STAT_RUN_INC(&pRec->patch);
485
486	Log(("PATMHandleInt3PatchTrap found int3 for %s at %x\n", patmGetInstructionString(pRec->patch.opcode, 0), pRegFrame->eip));
487
488	switch(pRec->patch.opcode)
489	{
490	case OP_CPUID:
491	case OP_IRET:
492	break;
493
494	case OP_STR:
495	case OP_SGDT:
496	case OP_SLDT:
497	case OP_SIDT:
498	case OP_LSL:
499	case OP_LAR:
500	case OP_SMSW:
501	case OP_VERW:
502	case OP_VERR:
503	default:
504	PATM_STAT_FAULT_INC(&pRec->patch);
505	pRec->patch.cTraps++;
506	return VINF_EM_RAW_EMULATE_INSTR;
507	}
508
509	PVMCPU pVCpu = VMMGetCpu0(pVM);
510	DISCPUMODE enmCpuMode = CPUMGetGuestDisMode(pVCpu);
511	if (enmCpuMode != DISCPUMODE_32BIT)
512	{
513	AssertFailed();
514	return VINF_EM_RAW_EMULATE_INSTR;
515	}
516
517	#ifdef VBOX_WITH_IEM
518	VBOXSTRICTRC rcStrict;
519	rcStrict = IEMExecOneBypassWithPrefetchedByPC(pVCpu, pRegFrame, pRegFrame->rip,
520	pRec->patch.aPrivInstr, pRec->patch.cbPrivInstr);
521	rc = VBOXSTRICTRC_TODO(rcStrict);
522	#else
523	uint32_t cbOp;
524	DISCPUSTATE cpu;
525	rc = DISInstr(&pRec->patch.aPrivInstr[0], enmCpuMode, &cpu, &cbOp);
526	if (RT_FAILURE(rc))
527	{
528	Log(("DISCoreOne failed with %Rrc\n", rc));
529	PATM_STAT_FAULT_INC(&pRec->patch);
530	pRec->patch.cTraps++;
531	return VINF_EM_RAW_EMULATE_INSTR;
532	}
533
534	rc = EMInterpretInstructionDisasState(pVCpu, &cpu, pRegFrame, 0 /* not relevant here */,
535	EMCODETYPE_SUPERVISOR);
536	#endif
537	if (RT_FAILURE(rc))
538	{
539	Log(("EMInterpretInstructionCPU failed with %Rrc\n", rc));
540	PATM_STAT_FAULT_INC(&pRec->patch);
541	pRec->patch.cTraps++;
542	return VINF_EM_RAW_EMULATE_INSTR;
543	}
544	return rc;
545	}
546	}
547	return VERR_PATCH_NOT_FOUND;
548	}
549

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source: vbox/trunk/src/VBox/VMM/VMMRC/PATMRC.cpp@ 44876

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