PATMRC.cpp@ 55895

Last change on this file since 55895 was 55895, checked in by vboxsync, 10 years ago
Added pvUser to the raw-mode context virtual handler callbacks.
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File size: 23.9 KB

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1	/* $Id: PATMRC.cpp 55895 2015-05-17 19:42:38Z 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	DECLEXPORT(int) patmRCVirtPagePfHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault,
60	RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
61	{
62	NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
63	pVM->patm.s.pvFaultMonitor = (RTRCPTR)(RTRCUINTPTR)pvFault;
64	return VINF_PATM_CHECK_PATCH_PAGE;
65	}
66
67
68	/**
69	* Checks if the write is located on a page with was patched before.
70	* (if so, then we are not allowed to turn on r/w)
71	*
72	* @returns VBox status
73	* @param pVM Pointer to the VM.
74	* @param pRegFrame CPU context
75	* @param GCPtr GC pointer to write address
76	* @param cbWrite Nr of bytes to write
77	*
78	*/
79	VMMRC_INT_DECL(int) PATMRCHandleWriteToPatchPage(PVM pVM, PCPUMCTXCORE pRegFrame, RTRCPTR GCPtr, uint32_t cbWrite)
80	{
81	RTGCUINTPTR pWritePageStart, pWritePageEnd;
82	PPATMPATCHPAGE pPatchPage;
83
84	/* Quick boundary check */
85	if ( PAGE_ADDRESS(GCPtr) < PAGE_ADDRESS(pVM->patm.s.pPatchedInstrGCLowest)
86	\|\| PAGE_ADDRESS(GCPtr) > PAGE_ADDRESS(pVM->patm.s.pPatchedInstrGCHighest)
87	)
88	return VERR_PATCH_NOT_FOUND;
89
90	STAM_PROFILE_ADV_START(&pVM->patm.s.StatPatchWriteDetect, a);
91
92	pWritePageStart = (RTRCUINTPTR)GCPtr & PAGE_BASE_GC_MASK;
93	pWritePageEnd = ((RTRCUINTPTR)GCPtr + cbWrite - 1) & PAGE_BASE_GC_MASK;
94
95	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (AVLOU32KEY)pWritePageStart);
96	if ( !pPatchPage
97	&& pWritePageStart != pWritePageEnd
98	)
99	{
100	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (AVLOU32KEY)pWritePageEnd);
101	}
102
103	#ifdef LOG_ENABLED
104	if (pPatchPage)
105	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));
106	#endif
107
108	if (pPatchPage)
109	{
110	if ( pPatchPage->pLowestAddrGC > (RTRCPTR)((RTRCUINTPTR)GCPtr + cbWrite - 1)
111	\|\| pPatchPage->pHighestAddrGC < (RTRCPTR)GCPtr)
112	{
113	/* This part of the page was not patched; try to emulate the instruction. */
114	LogFlow(("PATMHandleWriteToPatchPage: Interpret %x accessing %RRv\n", pRegFrame->eip, GCPtr));
115	int rc = EMInterpretInstruction(VMMGetCpu0(pVM), pRegFrame, (RTGCPTR)(RTRCUINTPTR)GCPtr);
116	if (rc == VINF_SUCCESS)
117	{
118	STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpreted);
119	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
120	return VINF_SUCCESS;
121	}
122	STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpretedFailed);
123	}
124	R3PTRTYPE(PPATCHINFO) paPatch = (R3PTRTYPE(PPATCHINFO) )MMHyperR3ToRC(pVM, pPatchPage->papPatch);
125
126	/* Increase the invalid write counter for each patch that's registered for that page. */
127	for (uint32_t i=0;i<pPatchPage->cCount;i++)
128	{
129	PPATCHINFO pPatch = (PPATCHINFO)MMHyperR3ToRC(pVM, paPatch[i]);
130
131	pPatch->cInvalidWrites++;
132	}
133
134	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
135	return VINF_EM_RAW_EMULATE_INSTR;
136	}
137
138	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
139	return VERR_PATCH_NOT_FOUND;
140	}
141
142
143	/**
144	* Checks if the illegal instruction was caused by a patched instruction
145	*
146	* @returns VBox status
147	*
148	* @param pVM Pointer to the VM.
149	* @param pCtxCore The relevant core context.
150	*/
151	VMMRC_INT_DECL(int) PATMRCHandleIllegalInstrTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
152	{
153	PPATMPATCHREC pRec;
154	PVMCPU pVCpu = VMMGetCpu0(pVM);
155	int rc;
156
157	/* Very important check -> otherwise we have a security leak. */
158	AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss.Sel & X86_SEL_RPL) <= (EMIsRawRing1Enabled(pVM) ? 2U : 1U),
159	VERR_ACCESS_DENIED);
160	Assert(PATMIsPatchGCAddr(pVM, pRegFrame->eip));
161
162	/* OP_ILLUD2 in PATM generated code? */
163	if (CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
164	{
165	LogFlow(("PATMRC: Pending action %x at %x\n", CTXSUFF(pVM->patm.s.pGCState)->uPendingAction, pRegFrame->eip));
166
167	/* Private PATM interface (@todo hack due to lack of anything generic). */
168	/* Parameters:
169	* eax = Pending action (currently PATM_ACTION_LOOKUP_ADDRESS)
170	* ecx = PATM_ACTION_MAGIC
171	*/
172	if ( (pRegFrame->eax & CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
173	&& pRegFrame->ecx == PATM_ACTION_MAGIC
174	)
175	{
176	CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
177
178	switch (pRegFrame->eax)
179	{
180	case PATM_ACTION_LOOKUP_ADDRESS:
181	{
182	/* Parameters:
183	* edx = GC address to find
184	* edi = PATCHJUMPTABLE ptr
185	*/
186	AssertMsg(!pRegFrame->edi \|\| PATMIsPatchGCAddr(pVM, pRegFrame->edi), ("edi = %x\n", pRegFrame->edi));
187
188	Log(("PATMRC: lookup %x jump table=%x\n", pRegFrame->edx, pRegFrame->edi));
189
190	pRec = patmQueryFunctionPatch(pVM, (RTRCPTR)pRegFrame->edx);
191	if (pRec)
192	{
193	if (pRec->patch.uState == PATCH_ENABLED)
194	{
195	RTGCUINTPTR pRelAddr = pRec->patch.pPatchBlockOffset; /* make it relative */
196	rc = patmAddBranchToLookupCache(pVM, (RTRCPTR)pRegFrame->edi, (RTRCPTR)pRegFrame->edx, pRelAddr);
197	if (rc == VINF_SUCCESS)
198	{
199	Log(("Patch block %RRv called as function\n", pRec->patch.pPrivInstrGC));
200	pRec->patch.flags \|= PATMFL_CODE_REFERENCED;
201
202	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
203	pRegFrame->eax = pRelAddr;
204	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionFound);
205	return VINF_SUCCESS;
206	}
207	AssertFailed();
208	}
209	else
210	{
211	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
212	pRegFrame->eax = 0; /* make it fault */
213	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
214	return VINF_SUCCESS;
215	}
216	}
217	else
218	{
219	/* Check first before trying to generate a function/trampoline patch. */
220	if (pVM->patm.s.fOutOfMemory)
221	{
222	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
223	pRegFrame->eax = 0; /* make it fault */
224	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
225	return VINF_SUCCESS;
226	}
227	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
228	return VINF_PATM_DUPLICATE_FUNCTION;
229	}
230	}
231
232	case PATM_ACTION_DISPATCH_PENDING_IRQ:
233	/* Parameters:
234	* edi = GC address to jump to
235	*/
236	Log(("PATMRC: Dispatch pending interrupt; eip=%x->%x\n", pRegFrame->eip, pRegFrame->edi));
237
238	/* Change EIP to the guest address the patch would normally jump to after setting IF. */
239	pRegFrame->eip = pRegFrame->edi;
240
241	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX\|PATM_RESTORE_EDI));
242	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
243
244	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
245	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
246	pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
247
248	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
249
250	/* We are no longer executing PATM code; set PIF again. */
251	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
252
253	STAM_COUNTER_INC(&pVM->patm.s.StatCheckPendingIRQ);
254
255	/* The caller will call trpmGCExitTrap, which will dispatch pending interrupts for us. */
256	return VINF_SUCCESS;
257
258	case PATM_ACTION_PENDING_IRQ_AFTER_IRET:
259	/* Parameters:
260	* edi = GC address to jump to
261	*/
262	Log(("PATMRC: Dispatch pending interrupt (iret); eip=%x->%x\n", pRegFrame->eip, pRegFrame->edi));
263	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX\|PATM_RESTORE_EDI));
264	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
265
266	/* Change EIP to the guest address of the iret. */
267	pRegFrame->eip = pRegFrame->edi;
268
269	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
270	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
271	pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
272	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
273
274	/* We are no longer executing PATM code; set PIF again. */
275	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
276
277	return VINF_PATM_PENDING_IRQ_AFTER_IRET;
278
279	case PATM_ACTION_DO_V86_IRET:
280	{
281	Log(("PATMRC: Do iret to V86 code; eip=%x\n", pRegFrame->eip));
282	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX));
283	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
284
285	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
286	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
287	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
288
289	rc = EMInterpretIretV86ForPatm(pVM, pVCpu, pRegFrame);
290	if (RT_SUCCESS(rc))
291	{
292	STAM_COUNTER_INC(&pVM->patm.s.StatEmulIret);
293
294	/* We are no longer executing PATM code; set PIF again. */
295	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
296	PGMRZDynMapReleaseAutoSet(pVCpu);
297	CPUMGCCallV86Code(pRegFrame);
298	/* does not return */
299	}
300	else
301	STAM_COUNTER_INC(&pVM->patm.s.StatEmulIretFailed);
302	return rc;
303	}
304
305	#ifdef DEBUG
306	case PATM_ACTION_LOG_CLI:
307	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) ));
308	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
309	return VINF_SUCCESS;
310
311	case PATM_ACTION_LOG_STI:
312	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) ));
313	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
314	return VINF_SUCCESS;
315
316	case PATM_ACTION_LOG_POPF_IF1:
317	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)));
318	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
319	return VINF_SUCCESS;
320
321	case PATM_ACTION_LOG_POPF_IF0:
322	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)));
323	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
324	return VINF_SUCCESS;
325
326	case PATM_ACTION_LOG_PUSHF:
327	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) ));
328	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
329	return VINF_SUCCESS;
330
331	case PATM_ACTION_LOG_IF1:
332	Log(("PATMRC: IF=1 escape from %x\n", pRegFrame->eip));
333	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
334	return VINF_SUCCESS;
335
336	case PATM_ACTION_LOG_IRET:
337	{
338	char pIretFrame = (char )pRegFrame->edx;
339	uint32_t eip, selCS, uEFlags;
340
341	rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
342	rc \|= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
343	rc \|= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
344	if (rc == VINF_SUCCESS)
345	{
346	if ( (uEFlags & X86_EFL_VM)
347	\|\| (selCS & X86_SEL_RPL) == 3)
348	{
349	uint32_t selSS, esp;
350
351	rc \|= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
352	rc \|= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
353
354	if (uEFlags & X86_EFL_VM)
355	{
356	uint32_t selDS, selES, selFS, selGS;
357	rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
358	rc \|= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
359	rc \|= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
360	rc \|= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
361	if (rc == VINF_SUCCESS)
362	{
363	Log(("PATMRC: IRET->VM stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
364	Log(("PATMRC: IRET->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
365	}
366	}
367	else
368	Log(("PATMRC: IRET stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
369	}
370	else
371	Log(("PATMRC: IRET stack frame: return address %04X:%x eflags=%08x\n", selCS, eip, uEFlags));
372	}
373	Log(("PATMRC: IRET from %x (IF->1) current eflags=%x\n", pRegFrame->eip, pVM->patm.s.CTXSUFF(pGCState)->uVMFlags));
374	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
375	return VINF_SUCCESS;
376	}
377
378	case PATM_ACTION_LOG_GATE_ENTRY:
379	{
380	char pIretFrame = (char )pRegFrame->edx;
381	uint32_t eip, selCS, uEFlags;
382
383	rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
384	rc \|= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
385	rc \|= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
386	if (rc == VINF_SUCCESS)
387	{
388	if ( (uEFlags & X86_EFL_VM)
389	\|\| (selCS & X86_SEL_RPL) == 3)
390	{
391	uint32_t selSS, esp;
392
393	rc \|= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
394	rc \|= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
395
396	if (uEFlags & X86_EFL_VM)
397	{
398	uint32_t selDS, selES, selFS, selGS;
399	rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
400	rc \|= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
401	rc \|= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
402	rc \|= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
403	if (rc == VINF_SUCCESS)
404	{
405	Log(("PATMRC: GATE->VM stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
406	Log(("PATMRC: GATE->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
407	}
408	}
409	else
410	Log(("PATMRC: GATE stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
411	}
412	else
413	Log(("PATMRC: GATE stack frame: return address %04X:%x eflags=%08x\n", selCS, eip, uEFlags));
414	}
415	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
416	return VINF_SUCCESS;
417	}
418
419	case PATM_ACTION_LOG_RET:
420	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)));
421	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
422	return VINF_SUCCESS;
423
424	case PATM_ACTION_LOG_CALL:
425	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)));
426	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
427	return VINF_SUCCESS;
428	#endif
429	default:
430	AssertFailed();
431	break;
432	}
433	}
434	else
435	AssertFailed();
436	CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
437	}
438	AssertMsgFailed(("Unexpected OP_ILLUD2 in patch code at %x (pending action %x)!!!!\n", pRegFrame->eip, CTXSUFF(pVM->patm.s.pGCState)->uPendingAction));
439	return VINF_EM_RAW_EMULATE_INSTR;
440	}
441
442	/**
443	* Checks if the int 3 was caused by a patched instruction
444	*
445	* @returns Strict VBox status, includes all statuses that
446	* EMInterpretInstructionDisasState and
447	* @retval VINF_SUCCESS
448	* @retval VINF_PATM_PATCH_INT3
449	* @retval VINF_EM_RAW_EMULATE_INSTR
450	*
451	* @param pVM Pointer to the VM.
452	* @param pCtxCore The relevant core context.
453	*/
454	VMMRC_INT_DECL(int) PATMRCHandleInt3PatchTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
455	{
456	PPATMPATCHREC pRec;
457	int rc;
458
459	AssertReturn(!pRegFrame->eflags.Bits.u1VM
460	&& ( (pRegFrame->ss.Sel & X86_SEL_RPL) == 1
461	\|\| (EMIsRawRing1Enabled(pVM) && (pRegFrame->ss.Sel & X86_SEL_RPL) == 2)), VERR_ACCESS_DENIED);
462
463	/* Int 3 in PATM generated code? (most common case) */
464	if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
465	{
466	/* Note! Hardcoded assumption about it being a single byte int 3 instruction. */
467	pRegFrame->eip--;
468	return VINF_PATM_PATCH_INT3;
469	}
470
471	/** @todo could use simple caching here to speed things up. */
472	pRec = (PPATMPATCHREC)RTAvloU32Get(&CTXSUFF(pVM->patm.s.PatchLookupTree)->PatchTree, (AVLOU32KEY)(pRegFrame->eip - 1)); /* eip is pointing to the instruction after 'int 3' already */
473	if (pRec && pRec->patch.uState == PATCH_ENABLED)
474	{
475	if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT_BLOCK)
476	{
477	Assert(pRec->patch.opcode == OP_CLI);
478	/* This is a special cli block that was turned into an int 3 patch. We jump to the generated code manually. */
479	pRegFrame->eip = (uint32_t)PATCHCODE_PTR_GC(&pRec->patch);
480	STAM_COUNTER_INC(&pVM->patm.s.StatInt3BlockRun);
481	return VINF_SUCCESS;
482	}
483	if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT)
484	{
485	/* eip is pointing to the instruction after 'int 3' already */
486	pRegFrame->eip = pRegFrame->eip - 1;
487
488	PATM_STAT_RUN_INC(&pRec->patch);
489
490	Log(("PATMHandleInt3PatchTrap found int3 for %s at %x\n", patmGetInstructionString(pRec->patch.opcode, 0), pRegFrame->eip));
491
492	switch(pRec->patch.opcode)
493	{
494	case OP_CPUID:
495	case OP_IRET:
496	#ifdef VBOX_WITH_RAW_RING1
497	case OP_SMSW:
498	case OP_MOV: /* mov xx, CS */
499	#endif
500	break;
501
502	case OP_STR:
503	case OP_SGDT:
504	case OP_SLDT:
505	case OP_SIDT:
506	case OP_LSL:
507	case OP_LAR:
508	#ifndef VBOX_WITH_RAW_RING1
509	case OP_SMSW:
510	#endif
511	case OP_VERW:
512	case OP_VERR:
513	default:
514	PATM_STAT_FAULT_INC(&pRec->patch);
515	pRec->patch.cTraps++;
516	return VINF_EM_RAW_EMULATE_INSTR;
517	}
518
519	PVMCPU pVCpu = VMMGetCpu0(pVM);
520	DISCPUMODE enmCpuMode = CPUMGetGuestDisMode(pVCpu);
521	if (enmCpuMode != DISCPUMODE_32BIT)
522	{
523	AssertFailed();
524	return VINF_EM_RAW_EMULATE_INSTR;
525	}
526
527	#ifdef VBOX_WITH_IEM
528	VBOXSTRICTRC rcStrict;
529	rcStrict = IEMExecOneBypassWithPrefetchedByPC(pVCpu, pRegFrame, pRegFrame->rip,
530	pRec->patch.aPrivInstr, pRec->patch.cbPrivInstr);
531	rc = VBOXSTRICTRC_TODO(rcStrict);
532	#else
533	uint32_t cbOp;
534	DISCPUSTATE cpu;
535	rc = DISInstr(&pRec->patch.aPrivInstr[0], enmCpuMode, &cpu, &cbOp);
536	if (RT_FAILURE(rc))
537	{
538	Log(("DISCoreOne failed with %Rrc\n", rc));
539	PATM_STAT_FAULT_INC(&pRec->patch);
540	pRec->patch.cTraps++;
541	return VINF_EM_RAW_EMULATE_INSTR;
542	}
543
544	rc = EMInterpretInstructionDisasState(pVCpu, &cpu, pRegFrame, 0 /* not relevant here */,
545	EMCODETYPE_SUPERVISOR);
546	#endif
547	if (RT_FAILURE(rc))
548	{
549	Log(("EMInterpretInstructionCPU failed with %Rrc\n", rc));
550	PATM_STAT_FAULT_INC(&pRec->patch);
551	pRec->patch.cTraps++;
552	return VINF_EM_RAW_EMULATE_INSTR;
553	}
554	return rc;
555	}
556	}
557	return VERR_PATCH_NOT_FOUND;
558	}
559

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source: vbox/trunk/src/VBox/VMM/VMMRC/PATMRC.cpp@ 55895

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