PATMGC.cpp@ 1507

Last change on this file since 1507 was 1438, checked in by vboxsync, 18 years ago
Finished trap/irq gate entry logging
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File size: 22.7 KB

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1	/* $Id: PATMGC.cpp 1438 2007-03-13 10:48:29Z vboxsync $ */
2	/** @file
3	* PATM - Dynamic Guest OS Patching Manager - Guest Context
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_PATM
27	#include <VBox/cpum.h>
28	#include <VBox/stam.h>
29	#include <VBox/patm.h>
30	#include <VBox/pgm.h>
31	#include <VBox/mm.h>
32	#include <VBox/sup.h>
33	#include <VBox/mm.h>
34	#include <VBox/param.h>
35	#include <iprt/avl.h>
36	#include "PATMInternal.h"
37	#include "PATMA.h"
38	#include <VBox/vm.h>
39	#include <VBox/dbg.h>
40	#include <VBox/dis.h>
41	#include <VBox/disopcode.h>
42	#include <VBox/em.h>
43	#include <VBox/err.h>
44	#include <VBox/selm.h>
45	#include <VBox/log.h>
46	#include <iprt/assert.h>
47	#include <iprt/asm.h>
48	#include <iprt/string.h>
49	#include <stdlib.h>
50	#include <stdio.h>
51
52
53	/**
54	* #PF Virtual Handler callback for Guest access a page monitored by PATM
55	*
56	* @returns VBox status code (appropritate for trap handling and GC return).
57	* @param pVM VM Handle.
58	* @param uErrorCode CPU Error code.
59	* @param pRegFrame Trap register frame.
60	* @param pvFault The fault address (cr2).
61	* @param pvRange The base address of the handled virtual range.
62	* @param offRange The offset of the access into this range.
63	* (If it's a EIP range this's the EIP, if not it's pvFault.)
64	*/
65	PATMGCDECL(int) PATMGCMonitorPage(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, void pvFault, void pvRange, uintptr_t offRange)
66	{
67	pVM->patm.s.pvFaultMonitor = pvFault;
68	return VINF_PATM_CHECK_PATCH_PAGE;
69	}
70
71
72	/**
73	* Checks if the write is located on a page with was patched before.
74	* (if so, then we are not allowed to turn on r/w)
75	*
76	* @returns VBox status
77	* @param pVM The VM to operate on.
78	* @param pRegFrame CPU context
79	* @param GCPtr GC pointer to write address
80	* @param cbWrite Nr of bytes to write
81	*
82	*/
83	PATMGCDECL(int) PATMGCHandleWriteToPatchPage(PVM pVM, PCPUMCTXCORE pRegFrame, RTGCPTR GCPtr, uint32_t cbWrite)
84	{
85	RTGCUINTPTR pWritePageStart, pWritePageEnd;
86	PPATMPATCHPAGE pPatchPage;
87
88	/* Quick boundary check */
89	if ( GCPtr < pVM->patm.s.pPatchedInstrGCLowest
90	\|\| GCPtr > pVM->patm.s.pPatchedInstrGCHighest
91	)
92	return VERR_PATCH_NOT_FOUND;
93
94	STAM_PROFILE_ADV_START(&pVM->patm.s.StatPatchWriteDetect, a);
95
96	pWritePageStart = (RTGCUINTPTR)GCPtr & PAGE_BASE_GC_MASK;
97	pWritePageEnd = ((RTGCUINTPTR)GCPtr + cbWrite - 1) & PAGE_BASE_GC_MASK;
98
99	pPatchPage = (PPATMPATCHPAGE)RTAvloGCPtrGet(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (RTGCPTR)pWritePageStart);
100	if ( !pPatchPage
101	&& pWritePageStart != pWritePageEnd
102	)
103	{
104	pPatchPage = (PPATMPATCHPAGE)RTAvloGCPtrGet(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (RTGCPTR)pWritePageEnd);
105	}
106
107	#ifdef LOG_ENABLED
108	if (pPatchPage)
109	Log(("PATMIsWriteToPatchPage: Found page %VGv for write to %VGv %d bytes\n", pPatchPage->Core.Key, GCPtr, cbWrite));
110	#endif
111
112	if (pPatchPage)
113	{
114	if ( pPatchPage->pLowestAddrGC <= (RTGCPTR)((RTGCUINTPTR)GCPtr + cbWrite)
115	\|\| pPatchPage->pHighestAddrGC > GCPtr)
116	{
117	/* This part of the page was not patched; try to emulate the instruction. */
118	uint32_t cb;
119
120	LogFlow(("PATMHandleWriteToPatchPage: Interpret %VGv accessing %VGv\n", pRegFrame->eip, GCPtr));
121	int rc = EMInterpretInstruction(pVM, pRegFrame, GCPtr, &cb);
122	if (rc == VINF_SUCCESS)
123	{
124	STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpreted);
125	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
126	return VINF_SUCCESS;
127	}
128	STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpretedFailed);
129	}
130	HCPTRTYPE(PPATCHINFO) paPatch = (HCPTRTYPE(PPATCHINFO) )MMHyperHC2GC(pVM, pPatchPage->aPatch);
131
132	/* Increase the invalid write counter for each patch that's registered for that page. */
133	for (uint32_t i=0;i<pPatchPage->cCount;i++)
134	{
135	PPATCHINFO pPatch = (PPATCHINFO)MMHyperHC2GC(pVM, paPatch[i]);
136
137	pPatch->cInvalidWrites++;
138	}
139
140	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
141	return VINF_EM_RAW_EMULATE_INSTR;
142	}
143
144	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
145	return VERR_PATCH_NOT_FOUND;
146	}
147
148
149	/**
150	* Checks if the illegal instruction was caused by a patched instruction
151	*
152	* @returns VBox status
153	*
154	* @param pVM The VM handle.
155	* @param pCtxCore The relevant core context.
156	*/
157	PATMDECL(int) PATMGCHandleIllegalInstrTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
158	{
159	PPATMPATCHREC pRec;
160	int rc;
161
162	/* Very important check -> otherwise we have a security leak. */
163	AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss & X86_SEL_RPL) == 1, VERR_ACCESS_DENIED);
164	Assert(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip));
165
166	/* OP_ILLUD2 in PATM generated code? */
167	if (CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
168	{
169	LogFlow(("PATMGC: Pending action %x at %VGv\n", CTXSUFF(pVM->patm.s.pGCState)->uPendingAction, pRegFrame->eip));
170
171	/* Private PATM interface (@todo hack due to lack of anything generic). */
172	/* Parameters:
173	* eax = Pending action (currently PATM_ACTION_LOOKUP_ADDRESS)
174	* ecx = PATM_ACTION_MAGIC
175	*/
176	if ( (pRegFrame->eax & CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
177	&& pRegFrame->ecx == PATM_ACTION_MAGIC
178	)
179	{
180	CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
181
182	switch (pRegFrame->eax)
183	{
184	case PATM_ACTION_LOOKUP_ADDRESS:
185	{
186	/* Parameters:
187	* edx = GC address to find
188	* edi = PATCHJUMPTABLE ptr
189	*/
190	AssertMsg(!pRegFrame->edi \|\| PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->edi), ("edx = %VGv\n", pRegFrame->edi));
191
192	Log(("PATMGC: lookup %VGv jump table=%VGv\n", pRegFrame->edx, pRegFrame->edi));
193
194	pRec = PATMQueryFunctionPatch(pVM, (RTGCPTR)(pRegFrame->edx));
195	if (pRec)
196	{
197	if (pRec->patch.uState == PATCH_ENABLED)
198	{
199	RTGCUINTPTR pRelAddr = pRec->patch.pPatchBlockOffset; /* make it relative */
200	rc = PATMAddBranchToLookupCache(pVM, (RTGCPTR)pRegFrame->edi, (RTGCPTR)pRegFrame->edx, pRelAddr);
201	if (rc == VINF_SUCCESS)
202	{
203	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
204	pRegFrame->eax = pRelAddr;
205	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionFound);
206	return VINF_SUCCESS;
207	}
208	AssertFailed();
209	}
210	else
211	{
212	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
213	pRegFrame->eax = 0; /* make it fault */
214	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
215	return VINF_SUCCESS;
216	}
217	}
218	else
219	{
220	#if 0
221	if (pRegFrame->edx == 0x806eca98)
222	{
223	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
224	pRegFrame->eax = 0; /* make it fault */
225	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
226	return VINF_SUCCESS;
227	}
228	#endif
229	STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
230	return VINF_PATM_DUPLICATE_FUNCTION;
231	}
232	}
233
234	case PATM_ACTION_DISPATCH_PENDING_IRQ:
235	/* Parameters:
236	* edi = GC address to jump to
237	*/
238	Log(("PATMGC: Dispatch pending interrupt; eip=%VGv->%VGv\n", pRegFrame->eip, pRegFrame->edi));
239
240	/* Change EIP to the guest address the patch would normally jump to after setting IF. */
241	pRegFrame->eip = pRegFrame->edi;
242
243	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX\|PATM_RESTORE_EDI));
244	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
245
246	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
247	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
248	pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
249
250	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
251
252	/* We are no longer executing PATM code; set PIF again. */
253	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
254
255	STAM_COUNTER_INC(&pVM->patm.s.StatCheckPendingIRQ);
256
257	/* The caller will call trpmGCExitTrap, which will dispatch pending interrupts for us. */
258	return VINF_SUCCESS;
259
260	case PATM_ACTION_PENDING_IRQ_AFTER_IRET:
261	/* Parameters:
262	* edi = GC address to jump to
263	*/
264	Log(("PATMGC: Dispatch pending interrupt (iret); eip=%VGv->%VGv\n", pRegFrame->eip, pRegFrame->edi));
265	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX\|PATM_RESTORE_EDI));
266	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
267
268	/* Change EIP to the guest address of the iret. */
269	pRegFrame->eip = pRegFrame->edi;
270
271	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
272	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
273	pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
274	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
275
276	/* We are no longer executing PATM code; set PIF again. */
277	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
278
279	return VINF_PATM_PENDING_IRQ_AFTER_IRET;
280
281	case PATM_ACTION_DO_V86_IRET:
282	{
283	Log(("PATMGC: Do iret to V86 code; eip=%VGv\n", pRegFrame->eip));
284	Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX\|PATM_RESTORE_ECX));
285	Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
286
287	pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
288	pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
289	pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
290
291	rc = EMInterpretIret(pVM, pRegFrame);
292	if (VBOX_SUCCESS(rc))
293	{
294	STAM_COUNTER_INC(&pVM->patm.s.StatEmulIret);
295
296	/* We are no longer executing PATM code; set PIF again. */
297	pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
298	CPUMGCCallV86Code(pRegFrame);
299	/* does not return */
300	}
301	else
302	STAM_COUNTER_INC(&pVM->patm.s.StatEmulIretFailed);
303	return rc;
304	}
305
306	#ifdef DEBUG
307	case PATM_ACTION_LOG_CLI:
308	Log(("PATMGC: CLI at %VGv (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) ));
309	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
310	return VINF_SUCCESS;
311
312	case PATM_ACTION_LOG_STI:
313	Log(("PATMGC: STI at %VGv (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) ));
314	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
315	return VINF_SUCCESS;
316
317	case PATM_ACTION_LOG_POPF_IF1:
318	Log(("PATMGC: POPF setting IF at %VGv (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)));
319	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
320	return VINF_SUCCESS;
321
322	case PATM_ACTION_LOG_POPF_IF0:
323	Log(("PATMGC: POPF at %VGv (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)));
324	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
325	return VINF_SUCCESS;
326
327	case PATM_ACTION_LOG_PUSHF:
328	Log(("PATMGC: PUSHF at %VGv (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) ));
329	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
330	return VINF_SUCCESS;
331
332	case PATM_ACTION_LOG_IF1:
333	Log(("PATMGC: IF=1 escape from %VGv\n", pRegFrame->eip));
334	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
335	return VINF_SUCCESS;
336
337	case PATM_ACTION_LOG_IRET:
338	{
339	char pIretFrame = (char )pRegFrame->edx;
340	uint32_t eip, selCS, uEFlags;
341
342	rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
343	rc \|= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
344	rc \|= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
345	if (rc == VINF_SUCCESS)
346	{
347	if ( (uEFlags & X86_EFL_VM)
348	\|\| (selCS & X86_SEL_RPL) == 3)
349	{
350	uint32_t selSS, esp;
351
352	rc \|= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
353	rc \|= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
354
355	if (uEFlags & X86_EFL_VM)
356	{
357	uint32_t selDS, selES, selFS, selGS;
358	rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
359	rc \|= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
360	rc \|= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
361	rc \|= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
362	if (rc == VINF_SUCCESS)
363	{
364	Log(("PATMGC: IRET->VM stack frame: return address %04X:%VGv eflags=%08x ss:esp=%04X:%VGv\n", selCS, eip, uEFlags, selSS, esp));
365	Log(("PATMGC: IRET->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
366	}
367	}
368	else
369	Log(("PATMGC: IRET stack frame: return address %04X:%VGv eflags=%08x ss:esp=%04X:%VGv\n", selCS, eip, uEFlags, selSS, esp));
370	}
371	else
372	Log(("PATMGC: IRET stack frame: return address %04X:%VGv eflags=%08x\n", selCS, eip, uEFlags));
373	}
374	Log(("PATMGC: IRET from %VGv (IF->1) current eflags=%x\n", pRegFrame->eip, pVM->patm.s.CTXSUFF(pGCState)->uVMFlags));
375	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
376	return VINF_SUCCESS;
377	}
378
379	case PATM_ACTION_LOG_GATE_ENTRY:
380	{
381	char pIretFrame = (char )pRegFrame->edx;
382	uint32_t eip, selCS, uEFlags;
383
384	rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
385	rc \|= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
386	rc \|= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
387	if (rc == VINF_SUCCESS)
388	{
389	if ( (uEFlags & X86_EFL_VM)
390	\|\| (selCS & X86_SEL_RPL) == 3)
391	{
392	uint32_t selSS, esp;
393
394	rc \|= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
395	rc \|= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
396
397	if (uEFlags & X86_EFL_VM)
398	{
399	uint32_t selDS, selES, selFS, selGS;
400	rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
401	rc \|= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
402	rc \|= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
403	rc \|= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
404	if (rc == VINF_SUCCESS)
405	{
406	Log(("PATMGC: GATE->VM stack frame: return address %04X:%VGv eflags=%08x ss:esp=%04X:%VGv\n", selCS, eip, uEFlags, selSS, esp));
407	Log(("PATMGC: GATE->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
408	}
409	}
410	else
411	Log(("PATMGC: GATE stack frame: return address %04X:%VGv eflags=%08x ss:esp=%04X:%VGv\n", selCS, eip, uEFlags, selSS, esp));
412	}
413	else
414	Log(("PATMGC: GATE stack frame: return address %04X:%VGv eflags=%08x\n", selCS, eip, uEFlags));
415	}
416	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
417	return VINF_SUCCESS;
418	}
419
420	case PATM_ACTION_LOG_RET:
421	Log(("PATMGC: RET to %VGv ESP=%VGv iopl=%d\n", pRegFrame->edx, pRegFrame->ebx, X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
422	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
423	return VINF_SUCCESS;
424
425	case PATM_ACTION_LOG_CALL:
426	Log(("PATMGC: CALL to %VGv return addr %VGv ESP=%VGv 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)));
427	pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
428	return VINF_SUCCESS;
429	#endif
430	default:
431	AssertFailed();
432	break;
433	}
434	}
435	else
436	AssertFailed();
437	CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
438	}
439	AssertMsgFailed(("Unexpected OP_ILLUD2 in patch code at %VGv (pending action %x)!!!!\n", pRegFrame->eip, CTXSUFF(pVM->patm.s.pGCState)->uPendingAction));
440	return VINF_EM_RAW_EMULATE_INSTR;
441	}
442
443	/**
444	* Checks if the int 3 was caused by a patched instruction
445	*
446	* @returns VBox status
447	*
448	* @param pVM The VM handle.
449	* @param pCtxCore The relevant core context.
450	*/
451	PATMDECL(int) PATMHandleInt3PatchTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
452	{
453	PPATMPATCHREC pRec;
454	int rc;
455
456	AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss & X86_SEL_RPL) == 1, VERR_ACCESS_DENIED);
457
458	/* Int 3 in PATM generated code? (most common case) */
459	if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip))
460	{
461	/* @note hardcoded assumption about it being a single byte int 3 instruction. */
462	pRegFrame->eip--;
463	return VINF_PATM_PATCH_INT3;
464	}
465
466	/** @todo could use simple caching here to speed things up. */
467	pRec = (PPATMPATCHREC)RTAvloGCPtrGet(&CTXSUFF(pVM->patm.s.PatchLookupTree)->PatchTree, (RTGCPTR)(pRegFrame->eip - 1)); /* eip is pointing to the instruction after 'int 3' already */
468	if (pRec && pRec->patch.uState == PATCH_ENABLED)
469	{
470	if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT_BLOCK)
471	{
472	Assert(pRec->patch.opcode == OP_CLI);
473	/* This is a special cli block that was turned into an int 3 patch. We jump to the generated code manually. */
474	pRegFrame->eip = (uint32_t)PATCHCODE_PTR_GC(&pRec->patch);
475	STAM_COUNTER_INC(&pVM->patm.s.StatInt3BlockRun);
476	return VINF_SUCCESS;
477	}
478	else
479	if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT)
480	{
481	uint32_t size, cbOp;
482	DISCPUSTATE cpu;
483
484	/* eip is pointing to the instruction after 'int 3' already */
485	pRegFrame->eip = pRegFrame->eip - 1;
486
487	PATM_STAT_RUN_INC(&pRec->patch);
488
489	Log(("PATMHandleInt3PatchTrap found int3 for %s at %VGv\n", patmGetInstructionString(pRec->patch.opcode, 0), pRegFrame->eip));
490
491	switch(pRec->patch.opcode)
492	{
493	case OP_CPUID:
494	case OP_IRET:
495	break;
496
497	case OP_STR:
498	case OP_SGDT:
499	case OP_SLDT:
500	case OP_SIDT:
501	case OP_LSL:
502	case OP_LAR:
503	case OP_SMSW:
504	case OP_VERW:
505	case OP_VERR:
506	default:
507	PATM_STAT_FAULT_INC(&pRec->patch);
508	pRec->patch.cTraps++;
509	return VINF_EM_RAW_EMULATE_INSTR;
510	}
511
512	cpu.mode = SELMIsSelector32Bit(pVM, pRegFrame->eflags, pRegFrame->cs, 0) ? CPUMODE_32BIT : CPUMODE_16BIT;
513	if(cpu.mode != CPUMODE_32BIT)
514	{
515	AssertFailed();
516	return VINF_EM_RAW_EMULATE_INSTR;
517	}
518	rc = DISCoreOne(&cpu, (RTUINTPTR)&pRec->patch.aPrivInstr[0], &cbOp);
519	if (VBOX_FAILURE(rc))
520	{
521	Log(("DISCoreOne failed with %Vrc\n", rc));
522	PATM_STAT_FAULT_INC(&pRec->patch);
523	pRec->patch.cTraps++;
524	return VINF_EM_RAW_EMULATE_INSTR;
525	}
526
527	rc = EMInterpretInstructionCPU(pVM, &cpu, pRegFrame, 0 /* not relevant here */, &size);
528	if (rc != VINF_SUCCESS)
529	{
530	Log(("EMInterpretInstructionCPU failed with %Vrc\n", rc));
531	PATM_STAT_FAULT_INC(&pRec->patch);
532	pRec->patch.cTraps++;
533	return VINF_EM_RAW_EMULATE_INSTR;
534	}
535
536	pRegFrame->eip += cpu.opsize;
537	return VINF_SUCCESS;
538	}
539	}
540	return VERR_PATCH_NOT_FOUND;
541	}
542

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source: vbox/trunk/src/VBox/VMM/PATM/VMMGC/PATMGC.cpp@ 1507

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