PATM.cpp@ 66651

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1	/* $Id: PATM.cpp 65650 2017-02-07 11:46:04Z vboxsync $ */
2	/** @file
3	* PATM - Dynamic Guest OS Patching Manager
4	*
5	* @note Never ever reuse patch memory!!
6	*/
7
8	/*
9	* Copyright (C) 2006-2016 Oracle Corporation
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*/
19
20	/** @page pg_patm PATM - Patch Manager
21	*
22	* The patch manager (PATM) patches privileged guest code to allow it to execute
23	* directly in raw-mode.
24	*
25	* The PATM works closely together with the @ref pg_csam "CSAM" detect code
26	* needing patching and detected changes to the patch. It also interfaces with
27	* other components, like @ref pg_trpm "TRPM" and @ref pg_rem "REM", for these
28	* purposes.
29	*
30	* @sa @ref grp_patm
31	*/
32
33
34	/*********************************************************************************************************************************
35	* Header Files *
36	*********************************************************************************************************************************/
37	#define LOG_GROUP LOG_GROUP_PATM
38	#include <VBox/vmm/patm.h>
39	#include <VBox/vmm/stam.h>
40	#include <VBox/vmm/pdmapi.h>
41	#include <VBox/vmm/pgm.h>
42	#include <VBox/vmm/cpum.h>
43	#include <VBox/vmm/cpumdis.h>
44	#include <VBox/vmm/iom.h>
45	#include <VBox/vmm/mm.h>
46	#include <VBox/vmm/em.h>
47	#include <VBox/vmm/hm.h>
48	#include <VBox/vmm/ssm.h>
49	#include <VBox/vmm/trpm.h>
50	#include <VBox/vmm/cfgm.h>
51	#include <VBox/param.h>
52	#include <VBox/vmm/selm.h>
53	#include <VBox/vmm/csam.h>
54	#include <iprt/avl.h>
55	#include "PATMInternal.h"
56	#include "PATMPatch.h"
57	#include <VBox/vmm/vm.h>
58	#include <VBox/vmm/uvm.h>
59	#include <VBox/dbg.h>
60	#include <VBox/err.h>
61	#include <VBox/log.h>
62	#include <iprt/assert.h>
63	#include <iprt/asm.h>
64	#include <VBox/dis.h>
65	#include <VBox/disopcode.h>
66
67	#include <iprt/string.h>
68	#include "PATMA.h"
69
70	//#define PATM_REMOVE_PATCH_ON_TOO_MANY_TRAPS
71	//#define PATM_DISABLE_ALL
72
73	/**
74	* Refresh trampoline patch state.
75	*/
76	typedef struct PATMREFRESHPATCH
77	{
78	/** Pointer to the VM structure. */
79	PVM pVM;
80	/** The trampoline patch record. */
81	PPATCHINFO pPatchTrampoline;
82	/** The new patch we want to jump to. */
83	PPATCHINFO pPatchRec;
84	} PATMREFRESHPATCH, *PPATMREFRESHPATCH;
85
86
87	#define PATMREAD_RAWCODE 1 /* read code as-is */
88	#define PATMREAD_ORGCODE 2 /* read original guest opcode bytes; not the patched bytes */
89	#define PATMREAD_NOCHECK 4 /* don't check for patch conflicts */
90
91	/*
92	* Private structure used during disassembly
93	*/
94	typedef struct
95	{
96	PVM pVM;
97	PPATCHINFO pPatchInfo;
98	R3PTRTYPE(uint8_t *) pbInstrHC;
99	RTRCPTR pInstrGC;
100	uint32_t fReadFlags;
101	} PATMDISASM, *PPATMDISASM;
102
103
104	/*********************************************************************************************************************************
105	* Internal Functions *
106	*********************************************************************************************************************************/
107	static int patmDisableUnusablePatch(PVM pVM, RTRCPTR pInstrGC, RTRCPTR pConflictAddr, PPATCHINFO pPatch);
108	static int patmActivateInt3Patch(PVM pVM, PPATCHINFO pPatch);
109	static int patmDeactivateInt3Patch(PVM pVM, PPATCHINFO pPatch);
110
111	#ifdef LOG_ENABLED // keep gcc quiet
112	static bool patmIsCommonIDTHandlerPatch(PVM pVM, RTRCPTR pInstrGC);
113	#endif
114	#ifdef VBOX_WITH_STATISTICS
115	static const char *PATMPatchType(PVM pVM, PPATCHINFO pPatch);
116	static void patmResetStat(PVM pVM, void *pvSample);
117	static void patmPrintStat(PVM pVM, void pvSample, char pszBuf, size_t cchBuf);
118	#endif
119
120	#define patmPatchHCPtr2PatchGCPtr(pVM, pHC) (pVM->patm.s.pPatchMemGC + (pHC - pVM->patm.s.pPatchMemHC))
121	#define patmPatchGCPtr2PatchHCPtr(pVM, pGC) (pVM->patm.s.pPatchMemHC + (pGC - pVM->patm.s.pPatchMemGC))
122
123	static int patmReinit(PVM pVM);
124	static DECLCALLBACK(int) patmR3RelocatePatches(PAVLOU32NODECORE pNode, void *pParam);
125	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
126	static RTRCPTR patmR3GuestGCPtrToPatchGCPtrSimple(PVM pVM, RCPTRTYPE(uint8_t*) pInstrGC);
127	#endif
128	static int patmR3MarkDirtyPatch(PVM pVM, PPATCHINFO pPatch);
129
130	#ifdef VBOX_WITH_DEBUGGER
131	static DECLCALLBACK(int) DisableAllPatches(PAVLOU32NODECORE pNode, void *pVM);
132	static FNDBGCCMD patmr3CmdOn;
133	static FNDBGCCMD patmr3CmdOff;
134
135	/** Command descriptors. */
136	static const DBGCCMD g_aCmds[] =
137	{
138	/* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, fFlags, pfnHandler pszSyntax, ....pszDescription */
139	{ "patmon", 0, 0, NULL, 0, 0, patmr3CmdOn, "", "Enable patching." },
140	{ "patmoff", 0, 0, NULL, 0, 0, patmr3CmdOff, "", "Disable patching." },
141	};
142	#endif
143
144	/* Don't want to break saved states, so put it here as a global variable. */
145	static unsigned int cIDTHandlersDisabled = 0;
146
147	/**
148	* Initializes the PATM.
149	*
150	* @returns VBox status code.
151	* @param pVM The cross context VM structure.
152	*/
153	VMMR3_INT_DECL(int) PATMR3Init(PVM pVM)
154	{
155	int rc;
156
157	/*
158	* We only need a saved state dummy loader if HM is enabled.
159	*/
160	if (HMIsEnabled(pVM))
161	{
162	pVM->fPATMEnabled = false;
163	return SSMR3RegisterStub(pVM, "PATM", 0);
164	}
165
166	/*
167	* Raw-mode.
168	*/
169	Log(("PATMR3Init: Patch record size %d\n", sizeof(PATCHINFO)));
170
171	/* These values can't change as they are hardcoded in patch code (old saved states!) */
172	AssertCompile(VMCPU_FF_TIMER == RT_BIT_32(2));
173	AssertCompile(VM_FF_REQUEST == VMCPU_FF_REQUEST);
174	AssertCompile(VMCPU_FF_INTERRUPT_APIC == RT_BIT_32(0));
175	AssertCompile(VMCPU_FF_INTERRUPT_PIC == RT_BIT_32(1));
176
177	AssertReleaseMsg(g_fPatmInterruptFlag == (VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST),
178	("Interrupt flags out of sync!! g_fPatmInterruptFlag=%#x expected %#x. broken assembler?\n", g_fPatmInterruptFlag, VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST));
179
180	/* Allocate patch memory and GC patch state memory. */
181	pVM->patm.s.cbPatchMem = PATCH_MEMORY_SIZE;
182	/* Add another page in case the generated code is much larger than expected. */
183	/** @todo bad safety precaution */
184	rc = MMR3HyperAllocOnceNoRel(pVM, PATCH_MEMORY_SIZE + PAGE_SIZE + PATM_STACK_TOTAL_SIZE + PAGE_SIZE + PATM_STAT_MEMSIZE, PAGE_SIZE, MM_TAG_PATM, (void **)&pVM->patm.s.pPatchMemHC);
185	if (RT_FAILURE(rc))
186	{
187	Log(("MMHyperAlloc failed with %Rrc\n", rc));
188	return rc;
189	}
190	pVM->patm.s.pPatchMemGC = MMHyperR3ToRC(pVM, pVM->patm.s.pPatchMemHC);
191
192	/* PATM stack page for call instruction execution. (2 parts: one for our private stack and one to store the original return address */
193	pVM->patm.s.pGCStackHC = (RTRCPTR *)(pVM->patm.s.pPatchMemHC + PATCH_MEMORY_SIZE + PAGE_SIZE);
194	pVM->patm.s.pGCStackGC = MMHyperR3ToRC(pVM, pVM->patm.s.pGCStackHC);
195
196	patmR3DbgInit(pVM);
197
198	/*
199	* Hypervisor memory for GC status data (read/write)
200	*
201	* Note1: This is non-critical data; if trashed by the guest, then it will only cause problems for itself
202	* Note2: This doesn't really belong here, but we need access to it for relocation purposes
203	*
204	*/
205	Assert(sizeof(PATMGCSTATE) < PAGE_SIZE); /* Note: hardcoded dependencies on this exist. */
206	pVM->patm.s.pGCStateHC = (PPATMGCSTATE)((uint8_t *)pVM->patm.s.pGCStackHC + PATM_STACK_TOTAL_SIZE);
207	pVM->patm.s.pGCStateGC = MMHyperR3ToRC(pVM, pVM->patm.s.pGCStateHC);
208
209	/* Hypervisor memory for patch statistics */
210	pVM->patm.s.pStatsHC = (PSTAMRATIOU32)((uint8_t *)pVM->patm.s.pGCStateHC + PAGE_SIZE);
211	pVM->patm.s.pStatsGC = MMHyperR3ToRC(pVM, pVM->patm.s.pStatsHC);
212
213	/* Memory for patch lookup trees. */
214	rc = MMHyperAlloc(pVM, sizeof(pVM->patm.s.PatchLookupTreeHC), 0, MM_TAG_PATM, (void *)&pVM->patm.s.PatchLookupTreeHC);
215	AssertRCReturn(rc, rc);
216	pVM->patm.s.PatchLookupTreeGC = MMHyperR3ToRC(pVM, pVM->patm.s.PatchLookupTreeHC);
217
218	#ifdef RT_ARCH_AMD64 /* see patmReinit(). */
219	/* Check CFGM option. */
220	rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "PATMEnabled", &pVM->fPATMEnabled);
221	if (RT_FAILURE(rc))
222	# ifdef PATM_DISABLE_ALL
223	pVM->fPATMEnabled = false;
224	# else
225	pVM->fPATMEnabled = true;
226	# endif
227	#endif
228
229	rc = patmReinit(pVM);
230	AssertRC(rc);
231	if (RT_FAILURE(rc))
232	return rc;
233
234	/*
235	* Register the virtual page access handler type.
236	*/
237	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_ALL, false /fRelocUserRC/,
238	NULL /pfnInvalidateR3/,
239	patmVirtPageHandler,
240	"patmVirtPageHandler", "patmRCVirtPagePfHandler",
241	"PATMMonitorPatchJump", &pVM->patm.s.hMonitorPageType);
242	AssertRCReturn(rc, rc);
243
244	/*
245	* Register save and load state notifiers.
246	*/
247	rc = SSMR3RegisterInternal(pVM, "PATM", 0, PATM_SAVED_STATE_VERSION, sizeof(pVM->patm.s) + PATCH_MEMORY_SIZE + PAGE_SIZE + PATM_STACK_TOTAL_SIZE + PAGE_SIZE,
248	NULL, NULL, NULL,
249	NULL, patmR3Save, NULL,
250	NULL, patmR3Load, NULL);
251	AssertRCReturn(rc, rc);
252
253	#ifdef VBOX_WITH_DEBUGGER
254	/*
255	* Debugger commands.
256	*/
257	static bool s_fRegisteredCmds = false;
258	if (!s_fRegisteredCmds)
259	{
260	int rc2 = DBGCRegisterCommands(&g_aCmds[0], RT_ELEMENTS(g_aCmds));
261	if (RT_SUCCESS(rc2))
262	s_fRegisteredCmds = true;
263	}
264	#endif
265
266	#ifdef VBOX_WITH_STATISTICS
267	STAM_REG(pVM, &pVM->patm.s.StatNrOpcodeRead, STAMTYPE_COUNTER, "/PATM/OpcodeBytesRead", STAMUNIT_OCCURENCES, "The number of opcode bytes read by the recompiler.");
268	STAM_REG(pVM, &pVM->patm.s.StatPATMMemoryUsed,STAMTYPE_COUNTER, "/PATM/MemoryUsed", STAMUNIT_OCCURENCES, "The amount of hypervisor heap used for patches.");
269	STAM_REG(pVM, &pVM->patm.s.StatDisabled, STAMTYPE_COUNTER, "/PATM/Patch/Disabled", STAMUNIT_OCCURENCES, "Number of times patches were disabled.");
270	STAM_REG(pVM, &pVM->patm.s.StatEnabled, STAMTYPE_COUNTER, "/PATM/Patch/Enabled", STAMUNIT_OCCURENCES, "Number of times patches were enabled.");
271	STAM_REG(pVM, &pVM->patm.s.StatDirty, STAMTYPE_COUNTER, "/PATM/Patch/Dirty", STAMUNIT_OCCURENCES, "Number of times patches were marked dirty.");
272	STAM_REG(pVM, &pVM->patm.s.StatUnusable, STAMTYPE_COUNTER, "/PATM/Patch/Unusable", STAMUNIT_OCCURENCES, "Number of unusable patches (conflicts).");
273	STAM_REG(pVM, &pVM->patm.s.StatInstalled, STAMTYPE_COUNTER, "/PATM/Patch/Installed", STAMUNIT_OCCURENCES, "Number of installed patches.");
274	STAM_REG(pVM, &pVM->patm.s.StatInt3Callable, STAMTYPE_COUNTER, "/PATM/Patch/Int3Callable", STAMUNIT_OCCURENCES, "Number of cli patches turned into int3 patches.");
275
276	STAM_REG(pVM, &pVM->patm.s.StatInt3BlockRun, STAMTYPE_COUNTER, "/PATM/Patch/Run/Int3", STAMUNIT_OCCURENCES, "Number of times an int3 block patch was executed.");
277	STAMR3RegisterF(pVM, &pVM->patm.s.pGCStateHC->uPatchCalls, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/Patch/Run/Normal");
278
279	STAM_REG(pVM, &pVM->patm.s.StatInstalledFunctionPatches, STAMTYPE_COUNTER, "/PATM/Patch/Installed/Function", STAMUNIT_OCCURENCES, "Number of installed function duplication patches.");
280	STAM_REG(pVM, &pVM->patm.s.StatInstalledTrampoline, STAMTYPE_COUNTER, "/PATM/Patch/Installed/Trampoline", STAMUNIT_OCCURENCES, "Number of installed trampoline patches.");
281	STAM_REG(pVM, &pVM->patm.s.StatInstalledJump, STAMTYPE_COUNTER, "/PATM/Patch/Installed/Jump", STAMUNIT_OCCURENCES, "Number of installed jump patches.");
282
283	STAM_REG(pVM, &pVM->patm.s.StatOverwritten, STAMTYPE_COUNTER, "/PATM/Patch/Overwritten", STAMUNIT_OCCURENCES, "Number of overwritten patches.");
284	STAM_REG(pVM, &pVM->patm.s.StatFixedConflicts,STAMTYPE_COUNTER, "/PATM/Patch/ConflictFixed", STAMUNIT_OCCURENCES, "Number of fixed conflicts.");
285	STAM_REG(pVM, &pVM->patm.s.StatFlushed, STAMTYPE_COUNTER, "/PATM/Patch/Flushed", STAMUNIT_OCCURENCES, "Number of flushes of pages with patch jumps.");
286	STAM_REG(pVM, &pVM->patm.s.StatMonitored, STAMTYPE_COUNTER, "/PATM/Patch/Monitored", STAMUNIT_OCCURENCES, "Number of patches in monitored patch pages.");
287	STAM_REG(pVM, &pVM->patm.s.StatPageBoundaryCrossed, STAMTYPE_COUNTER, "/PATM/Patch/BoundaryCross", STAMUNIT_OCCURENCES, "Number of refused patches due to patch jump crossing page boundary.");
288
289	STAM_REG(pVM, &pVM->patm.s.StatHandleTrap, STAMTYPE_PROFILE, "/PATM/HandleTrap", STAMUNIT_TICKS_PER_CALL, "Profiling of PATMR3HandleTrap");
290	STAM_REG(pVM, &pVM->patm.s.StatPushTrap, STAMTYPE_COUNTER, "/PATM/HandleTrap/PushWP", STAMUNIT_OCCURENCES, "Number of traps due to monitored stack pages.");
291
292	STAM_REG(pVM, &pVM->patm.s.StatSwitchBack, STAMTYPE_COUNTER, "/PATM/SwitchBack", STAMUNIT_OCCURENCES, "Switch back to original guest code when IF=1 & executing PATM instructions");
293	STAM_REG(pVM, &pVM->patm.s.StatSwitchBackFail,STAMTYPE_COUNTER, "/PATM/SwitchBackFail", STAMUNIT_OCCURENCES, "Failed switch back to original guest code when IF=1 & executing PATM instructions");
294
295	STAM_REG(pVM, &pVM->patm.s.StatDuplicateREQFailed, STAMTYPE_COUNTER, "/PATM/Function/DupREQ/Failed", STAMUNIT_OCCURENCES, "Nr of failed PATMR3DuplicateFunctionRequest calls");
296	STAM_REG(pVM, &pVM->patm.s.StatDuplicateREQSuccess, STAMTYPE_COUNTER, "/PATM/Function/DupREQ/Success", STAMUNIT_OCCURENCES, "Nr of successful PATMR3DuplicateFunctionRequest calls");
297	STAM_REG(pVM, &pVM->patm.s.StatDuplicateUseExisting,STAMTYPE_COUNTER, "/PATM/Function/DupREQ/UseExist", STAMUNIT_OCCURENCES, "Nr of successful PATMR3DuplicateFunctionRequest calls when using an existing patch");
298
299	STAM_REG(pVM, &pVM->patm.s.StatFunctionLookupInsert, STAMTYPE_COUNTER, "/PATM/Function/Lookup/Insert", STAMUNIT_OCCURENCES, "Nr of successful function address insertions");
300	STAM_REG(pVM, &pVM->patm.s.StatFunctionLookupReplace, STAMTYPE_COUNTER, "/PATM/Function/Lookup/Replace", STAMUNIT_OCCURENCES, "Nr of successful function address replacements");
301	STAM_REG(pVM, &pVM->patm.s.StatU32FunctionMaxSlotsUsed, STAMTYPE_U32_RESET,"/PATM/Function/Lookup/MaxSlots", STAMUNIT_OCCURENCES, "Maximum nr of lookup slots used in all call patches");
302
303	STAM_REG(pVM, &pVM->patm.s.StatFunctionFound, STAMTYPE_COUNTER, "/PATM/Function/Found", STAMUNIT_OCCURENCES, "Nr of successful function patch lookups in GC");
304	STAM_REG(pVM, &pVM->patm.s.StatFunctionNotFound, STAMTYPE_COUNTER, "/PATM/Function/NotFound", STAMUNIT_OCCURENCES, "Nr of failed function patch lookups in GC");
305
306	STAM_REG(pVM, &pVM->patm.s.StatPatchWrite, STAMTYPE_PROFILE, "/PATM/Write/Handle", STAMUNIT_TICKS_PER_CALL, "Profiling of PATMR3PatchWrite");
307	STAM_REG(pVM, &pVM->patm.s.StatPatchWriteDetect, STAMTYPE_PROFILE, "/PATM/Write/Detect", STAMUNIT_TICKS_PER_CALL, "Profiling of PATMIsWriteToPatchPage");
308	STAM_REG(pVM, &pVM->patm.s.StatPatchWriteInterpreted, STAMTYPE_COUNTER, "/PATM/Write/Interpreted/Success", STAMUNIT_OCCURENCES, "Nr of interpreted patch writes.");
309	STAM_REG(pVM, &pVM->patm.s.StatPatchWriteInterpretedFailed, STAMTYPE_COUNTER, "/PATM/Write/Interpreted/Failed", STAMUNIT_OCCURENCES, "Nr of failed interpreted patch writes.");
310
311	STAM_REG(pVM, &pVM->patm.s.StatPatchRefreshSuccess, STAMTYPE_COUNTER, "/PATM/Refresh/Success", STAMUNIT_OCCURENCES, "Successful patch refreshes");
312	STAM_REG(pVM, &pVM->patm.s.StatPatchRefreshFailed, STAMTYPE_COUNTER, "/PATM/Refresh/Failure", STAMUNIT_OCCURENCES, "Failed patch refreshes");
313
314	STAM_REG(pVM, &pVM->patm.s.StatPatchPageInserted, STAMTYPE_COUNTER, "/PATM/Page/Inserted", STAMUNIT_OCCURENCES, "Nr of inserted guest pages that were patched");
315	STAM_REG(pVM, &pVM->patm.s.StatPatchPageRemoved, STAMTYPE_COUNTER, "/PATM/Page/Removed", STAMUNIT_OCCURENCES, "Nr of removed guest pages that were patched");
316
317	STAM_REG(pVM, &pVM->patm.s.StatInstrDirty, STAMTYPE_COUNTER, "/PATM/Instr/Dirty/Detected", STAMUNIT_OCCURENCES, "Number of times instructions were marked dirty.");
318	STAM_REG(pVM, &pVM->patm.s.StatInstrDirtyGood, STAMTYPE_COUNTER, "/PATM/Instr/Dirty/Corrected", STAMUNIT_OCCURENCES, "Number of times instructions were marked dirty and corrected later on.");
319	STAM_REG(pVM, &pVM->patm.s.StatInstrDirtyBad, STAMTYPE_COUNTER, "/PATM/Instr/Dirty/Failed", STAMUNIT_OCCURENCES, "Number of times instructions were marked dirty and we were not able to correct them.");
320
321	STAM_REG(pVM, &pVM->patm.s.StatSysEnter, STAMTYPE_COUNTER, "/PATM/Emul/SysEnter", STAMUNIT_OCCURENCES, "Number of times sysenter was emulated.");
322	STAM_REG(pVM, &pVM->patm.s.StatSysExit, STAMTYPE_COUNTER, "/PATM/Emul/SysExit" , STAMUNIT_OCCURENCES, "Number of times sysexit was emulated.");
323	STAM_REG(pVM, &pVM->patm.s.StatEmulIret, STAMTYPE_COUNTER, "/PATM/Emul/Iret/Success", STAMUNIT_OCCURENCES, "Number of times iret was emulated.");
324	STAM_REG(pVM, &pVM->patm.s.StatEmulIretFailed, STAMTYPE_COUNTER, "/PATM/Emul/Iret/Failed", STAMUNIT_OCCURENCES, "Number of times iret was emulated.");
325
326	STAM_REG(pVM, &pVM->patm.s.StatGenRet, STAMTYPE_COUNTER, "/PATM/Gen/Ret" , STAMUNIT_OCCURENCES, "Number of generated ret instructions.");
327	STAM_REG(pVM, &pVM->patm.s.StatGenRetReused, STAMTYPE_COUNTER, "/PATM/Gen/RetReused" , STAMUNIT_OCCURENCES, "Number of reused ret instructions.");
328	STAM_REG(pVM, &pVM->patm.s.StatGenCall, STAMTYPE_COUNTER, "/PATM/Gen/Call", STAMUNIT_OCCURENCES, "Number of generated call instructions.");
329	STAM_REG(pVM, &pVM->patm.s.StatGenJump, STAMTYPE_COUNTER, "/PATM/Gen/Jmp" , STAMUNIT_OCCURENCES, "Number of generated indirect jump instructions.");
330	STAM_REG(pVM, &pVM->patm.s.StatGenPopf, STAMTYPE_COUNTER, "/PATM/Gen/Popf" , STAMUNIT_OCCURENCES, "Number of generated popf instructions.");
331
332	STAM_REG(pVM, &pVM->patm.s.StatCheckPendingIRQ, STAMTYPE_COUNTER, "/PATM/GC/CheckIRQ" , STAMUNIT_OCCURENCES, "Number of traps that ask to check for pending irqs.");
333	#endif /* VBOX_WITH_STATISTICS */
334
335	Log(("g_patmCallRecord.cbFunction %u\n", g_patmCallRecord.cbFunction));
336	Log(("g_patmCallIndirectRecord.cbFunction %u\n", g_patmCallIndirectRecord.cbFunction));
337	Log(("g_patmRetRecord.cbFunction %u\n", g_patmRetRecord.cbFunction));
338	Log(("g_patmJumpIndirectRecord.cbFunction %u\n", g_patmJumpIndirectRecord.cbFunction));
339	Log(("g_patmPopf32Record.cbFunction %u\n", g_patmPopf32Record.cbFunction));
340	Log(("g_patmIretRecord.cbFunction %u\n", g_patmIretRecord.cbFunction));
341	Log(("g_patmStiRecord.cbFunction %u\n", g_patmStiRecord.cbFunction));
342	Log(("g_patmCheckIFRecord.cbFunction %u\n", g_patmCheckIFRecord.cbFunction));
343
344	return rc;
345	}
346
347	/**
348	* Finalizes HMA page attributes.
349	*
350	* @returns VBox status code.
351	* @param pVM The cross context VM structure.
352	*/
353	VMMR3_INT_DECL(int) PATMR3InitFinalize(PVM pVM)
354	{
355	if (HMIsEnabled(pVM))
356	return VINF_SUCCESS;
357
358	/*
359	* The GC state, stack and statistics must be read/write for the guest
360	* (supervisor only of course).
361	*
362	* Remember, we run guest code at ring-1 and ring-2 levels, which are
363	* considered supervisor levels by the paging structures. We run the VMM
364	* in ring-0 with CR0.WP=0 and mapping all VMM structures as read-only
365	* pages. The following structures are exceptions and must be mapped with
366	* write access so the ring-1 and ring-2 code can modify them.
367	*/
368	int rc = PGMMapSetPage(pVM, pVM->patm.s.pGCStateGC, PAGE_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D \| X86_PTE_RW);
369	AssertLogRelMsgReturn(RT_SUCCESS(rc), ("Failed to make the GCState accessible to ring-1 and ring-2 code: %Rrc\n", rc), rc);
370
371	rc = PGMMapSetPage(pVM, pVM->patm.s.pGCStackGC, PATM_STACK_TOTAL_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D \| X86_PTE_RW);
372	AssertLogRelMsgReturn(RT_SUCCESS(rc), ("Failed to make the GCStack accessible to ring-1 and ring-2 code: %Rrc\n", rc), rc);
373
374	rc = PGMMapSetPage(pVM, pVM->patm.s.pStatsGC, PATM_STAT_MEMSIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D \| X86_PTE_RW);
375	AssertLogRelMsgReturn(RT_SUCCESS(rc), ("Failed to make the stats struct accessible to ring-1 and ring-2 code: %Rrc\n", rc), rc);
376
377	/*
378	* Find the patch helper segment so we can identify code running there as patch code.
379	*/
380	rc = PDMR3LdrGetSymbolRC(pVM, NULL, "g_PatchHlpBegin", &pVM->patm.s.pbPatchHelpersRC);
381	AssertLogRelMsgReturn(RT_SUCCESS(rc), ("Failed to resolve g_PatchHlpBegin: %Rrc\n", rc), rc);
382	pVM->patm.s.pbPatchHelpersR3 = (uint8_t *)MMHyperRCToR3(pVM, pVM->patm.s.pbPatchHelpersRC);
383	AssertLogRelReturn(pVM->patm.s.pbPatchHelpersR3 != NULL, VERR_INTERNAL_ERROR_3);
384
385	RTRCPTR RCPtrEnd;
386	rc = PDMR3LdrGetSymbolRC(pVM, NULL, "g_PatchHlpEnd", &RCPtrEnd);
387	AssertLogRelMsgReturn(RT_SUCCESS(rc), ("Failed to resolve g_PatchHlpEnd: %Rrc\n", rc), rc);
388
389	pVM->patm.s.cbPatchHelpers = RCPtrEnd - pVM->patm.s.pbPatchHelpersRC;
390	AssertLogRelMsgReturn(pVM->patm.s.cbPatchHelpers < _128K,
391	("%RRv-%RRv => %#x\n", pVM->patm.s.pbPatchHelpersRC, RCPtrEnd, pVM->patm.s.cbPatchHelpers),
392	VERR_INTERNAL_ERROR_4);
393
394
395	return VINF_SUCCESS;
396	}
397
398	/**
399	* (Re)initializes PATM
400	*
401	* @param pVM The cross context VM structure.
402	*/
403	static int patmReinit(PVM pVM)
404	{
405	int rc;
406
407	/*
408	* Assert alignment and sizes.
409	*/
410	AssertRelease(!(RT_OFFSETOF(VM, patm.s) & 31));
411	AssertRelease(sizeof(pVM->patm.s) <= sizeof(pVM->patm.padding));
412
413	/*
414	* Setup any fixed pointers and offsets.
415	*/
416	pVM->patm.s.offVM = RT_OFFSETOF(VM, patm);
417
418	#ifndef RT_ARCH_AMD64 /* would be nice if this was changed everywhere. was driving me crazy on AMD64. */
419	#ifndef PATM_DISABLE_ALL
420	pVM->fPATMEnabled = true;
421	#endif
422	#endif
423
424	Assert(pVM->patm.s.pGCStateHC);
425	memset(pVM->patm.s.pGCStateHC, 0, PAGE_SIZE);
426	AssertReleaseMsg(pVM->patm.s.pGCStateGC, ("Impossible! MMHyperHC2GC(%p) failed!\n", pVM->patm.s.pGCStateGC));
427
428	Log(("Patch memory allocated at %p - %RRv\n", pVM->patm.s.pPatchMemHC, pVM->patm.s.pPatchMemGC));
429	pVM->patm.s.pGCStateHC->uVMFlags = X86_EFL_IF;
430
431	Assert(pVM->patm.s.pGCStackHC);
432	memset(pVM->patm.s.pGCStackHC, 0, PAGE_SIZE);
433	AssertReleaseMsg(pVM->patm.s.pGCStackGC, ("Impossible! MMHyperHC2GC(%p) failed!\n", pVM->patm.s.pGCStackGC));
434	pVM->patm.s.pGCStateHC->Psp = PATM_STACK_SIZE;
435	pVM->patm.s.pGCStateHC->fPIF = 1; /* PATM Interrupt Flag */
436
437	Assert(pVM->patm.s.pStatsHC);
438	memset(pVM->patm.s.pStatsHC, 0, PATM_STAT_MEMSIZE);
439	AssertReleaseMsg(pVM->patm.s.pStatsGC, ("Impossible! MMHyperHC2GC(%p) failed!\n", pVM->patm.s.pStatsGC));
440
441	Assert(pVM->patm.s.pPatchMemHC);
442	Assert(pVM->patm.s.pPatchMemGC == MMHyperR3ToRC(pVM, pVM->patm.s.pPatchMemHC));
443	memset(pVM->patm.s.pPatchMemHC, 0, PATCH_MEMORY_SIZE);
444	AssertReleaseMsg(pVM->patm.s.pPatchMemGC, ("Impossible! MMHyperHC2GC(%p) failed!\n", pVM->patm.s.pPatchMemHC));
445
446	/* Needed for future patching of sldt/sgdt/sidt/str etc. */
447	pVM->patm.s.pCPUMCtxGC = VM_RC_ADDR(pVM, CPUMQueryGuestCtxPtr(VMMGetCpu(pVM)));
448
449	Assert(pVM->patm.s.PatchLookupTreeHC);
450	Assert(pVM->patm.s.PatchLookupTreeGC == MMHyperR3ToRC(pVM, pVM->patm.s.PatchLookupTreeHC));
451
452	/*
453	* (Re)Initialize PATM structure
454	*/
455	Assert(!pVM->patm.s.PatchLookupTreeHC->PatchTree);
456	Assert(!pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr);
457	Assert(!pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage);
458	pVM->patm.s.offPatchMem = 16; /* don't start with zero here */
459	pVM->patm.s.uCurrentPatchIdx = 1; /* Index zero is a dummy */
460	pVM->patm.s.pvFaultMonitor = 0;
461	pVM->patm.s.deltaReloc = 0;
462
463	/* Lowest and highest patched instruction */
464	pVM->patm.s.pPatchedInstrGCLowest = RTRCPTR_MAX;
465	pVM->patm.s.pPatchedInstrGCHighest = 0;
466
467	pVM->patm.s.PatchLookupTreeHC->PatchTree = 0;
468	pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr = 0;
469	pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage = 0;
470
471	pVM->patm.s.pfnSysEnterPatchGC = 0;
472	pVM->patm.s.pfnSysEnterGC = 0;
473
474	pVM->patm.s.fOutOfMemory = false;
475
476	pVM->patm.s.pfnHelperCallGC = 0;
477	patmR3DbgReset(pVM);
478
479	/* Generate all global functions to be used by future patches. */
480	/* We generate a fake patch in order to use the existing code for relocation. */
481	rc = MMHyperAlloc(pVM, sizeof(PATMPATCHREC), 0, MM_TAG_PATM_PATCH, (void **)&pVM->patm.s.pGlobalPatchRec);
482	if (RT_FAILURE(rc))
483	{
484	Log(("Out of memory!!!!\n"));
485	return VERR_NO_MEMORY;
486	}
487	pVM->patm.s.pGlobalPatchRec->patch.flags = PATMFL_GLOBAL_FUNCTIONS;
488	pVM->patm.s.pGlobalPatchRec->patch.uState = PATCH_ENABLED;
489	pVM->patm.s.pGlobalPatchRec->patch.pPatchBlockOffset = pVM->patm.s.offPatchMem;
490
491	rc = patmPatchGenGlobalFunctions(pVM, &pVM->patm.s.pGlobalPatchRec->patch);
492	AssertRC(rc);
493
494	/* Update free pointer in patch memory. */
495	pVM->patm.s.offPatchMem += pVM->patm.s.pGlobalPatchRec->patch.uCurPatchOffset;
496	/* Round to next 8 byte boundary. */
497	pVM->patm.s.offPatchMem = RT_ALIGN_32(pVM->patm.s.offPatchMem, 8);
498
499
500	return rc;
501	}
502
503
504	/**
505	* Applies relocations to data and code managed by this
506	* component. This function will be called at init and
507	* whenever the VMM need to relocate it self inside the GC.
508	*
509	* The PATM will update the addresses used by the switcher.
510	*
511	* @param pVM The cross context VM structure.
512	* @param offDelta The relocation delta.
513	*/
514	VMMR3_INT_DECL(void) PATMR3Relocate(PVM pVM, RTRCINTPTR offDelta)
515	{
516	if (HMIsEnabled(pVM))
517	return;
518
519	RTRCPTR GCPtrNew = MMHyperR3ToRC(pVM, pVM->patm.s.pGCStateHC);
520	Assert((RTRCINTPTR)(GCPtrNew - pVM->patm.s.pGCStateGC) == offDelta);
521
522	Log(("PATMR3Relocate from %RRv to %RRv - delta %08X\n", pVM->patm.s.pGCStateGC, GCPtrNew, offDelta));
523	if (offDelta)
524	{
525	PCPUMCTX pCtx;
526
527	/* Update CPUMCTX guest context pointer. */
528	pVM->patm.s.pCPUMCtxGC += offDelta;
529
530	pVM->patm.s.deltaReloc = offDelta;
531	RTAvloU32DoWithAll(&pVM->patm.s.PatchLookupTreeHC->PatchTree, true, patmR3RelocatePatches, (void *)pVM);
532
533	pVM->patm.s.pGCStateGC = GCPtrNew;
534	pVM->patm.s.pPatchMemGC = MMHyperR3ToRC(pVM, pVM->patm.s.pPatchMemHC);
535	pVM->patm.s.pGCStackGC = MMHyperR3ToRC(pVM, pVM->patm.s.pGCStackHC);
536	pVM->patm.s.pStatsGC = MMHyperR3ToRC(pVM, pVM->patm.s.pStatsHC);
537	pVM->patm.s.PatchLookupTreeGC = MMHyperR3ToRC(pVM, pVM->patm.s.PatchLookupTreeHC);
538
539	if (pVM->patm.s.pfnSysEnterPatchGC)
540	pVM->patm.s.pfnSysEnterPatchGC += offDelta;
541
542	/* If we are running patch code right now, then also adjust EIP. */
543	pCtx = CPUMQueryGuestCtxPtr(VMMGetCpu(pVM));
544	if (PATMIsPatchGCAddr(pVM, pCtx->eip))
545	pCtx->eip += offDelta;
546
547	/* Deal with the global patch functions. */
548	pVM->patm.s.pfnHelperCallGC += offDelta;
549	pVM->patm.s.pfnHelperRetGC += offDelta;
550	pVM->patm.s.pfnHelperIretGC += offDelta;
551	pVM->patm.s.pfnHelperJumpGC += offDelta;
552
553	pVM->patm.s.pbPatchHelpersRC += offDelta;
554
555	patmR3RelocatePatches(&pVM->patm.s.pGlobalPatchRec->Core, (void *)pVM);
556	}
557	}
558
559
560	/**
561	* Terminates the PATM.
562	*
563	* Termination means cleaning up and freeing all resources,
564	* the VM it self is at this point powered off or suspended.
565	*
566	* @returns VBox status code.
567	* @param pVM The cross context VM structure.
568	*/
569	VMMR3_INT_DECL(int) PATMR3Term(PVM pVM)
570	{
571	if (HMIsEnabled(pVM))
572	return VINF_SUCCESS;
573
574	patmR3DbgTerm(pVM);
575
576	/* Memory was all allocated from the two MM heaps and requires no freeing. */
577	return VINF_SUCCESS;
578	}
579
580
581	/**
582	* PATM reset callback.
583	*
584	* @returns VBox status code.
585	* @param pVM The cross context VM structure.
586	*/
587	VMMR3_INT_DECL(int) PATMR3Reset(PVM pVM)
588	{
589	Log(("PATMR3Reset\n"));
590	if (HMIsEnabled(pVM))
591	return VINF_SUCCESS;
592
593	/* Free all patches. */
594	for (;;)
595	{
596	PPATMPATCHREC pPatchRec = (PPATMPATCHREC)RTAvloU32RemoveBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, 0, true);
597	if (pPatchRec)
598	patmR3RemovePatch(pVM, pPatchRec, true);
599	else
600	break;
601	}
602	Assert(!pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage);
603	Assert(!pVM->patm.s.PatchLookupTreeHC->PatchTree);
604	pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr = 0;
605	pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage = 0;
606
607	int rc = patmReinit(pVM);
608	if (RT_SUCCESS(rc))
609	rc = PATMR3InitFinalize(pVM); /* paranoia */
610
611	return rc;
612	}
613
614	/**
615	* @callback_method_impl{FNDISREADBYTES}
616	*/
617	static DECLCALLBACK(int) patmReadBytes(PDISCPUSTATE pDis, uint8_t offInstr, uint8_t cbMinRead, uint8_t cbMaxRead)
618	{
619	PATMDISASM pDisInfo = (PATMDISASM )pDis->pvUser;
620
621	/** @todo change this to read more! */
622	/*
623	* Trap/interrupt handler typically call common code on entry. Which might already have patches inserted.
624	* As we currently don't support calling patch code from patch code, we'll let it read the original opcode bytes instead.
625	*/
626	/** @todo could change in the future! */
627	if (pDisInfo->fReadFlags & PATMREAD_ORGCODE)
628	{
629	size_t cbRead = cbMaxRead;
630	RTUINTPTR uSrcAddr = pDis->uInstrAddr + offInstr;
631	int rc = PATMR3ReadOrgInstr(pDisInfo->pVM, pDis->uInstrAddr + offInstr, &pDis->abInstr[offInstr], cbRead, &cbRead);
632	if (RT_SUCCESS(rc))
633	{
634	if (cbRead >= cbMinRead)
635	{
636	pDis->cbCachedInstr = offInstr + (uint8_t)cbRead;
637	return VINF_SUCCESS;
638	}
639
640	cbMinRead -= (uint8_t)cbRead;
641	cbMaxRead -= (uint8_t)cbRead;
642	offInstr += (uint8_t)cbRead;
643	uSrcAddr += cbRead;
644	}
645
646	#ifdef VBOX_STRICT
647	if ( !(pDisInfo->pPatchInfo->flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_IDTHANDLER))
648	&& !(pDisInfo->fReadFlags & PATMREAD_NOCHECK))
649	{
650	Assert(PATMR3IsInsidePatchJump(pDisInfo->pVM, pDis->uInstrAddr + offInstr, NULL) == false);
651	Assert(PATMR3IsInsidePatchJump(pDisInfo->pVM, pDis->uInstrAddr + offInstr + cbMinRead-1, NULL) == false);
652	}
653	#endif
654	}
655
656	int rc = VINF_SUCCESS;
657	RTGCPTR32 uSrcAddr = (RTGCPTR32)pDis->uInstrAddr + offInstr;
658	if ( !pDisInfo->pbInstrHC
659	\|\| ( PAGE_ADDRESS(pDisInfo->pInstrGC) != PAGE_ADDRESS(uSrcAddr + cbMinRead - 1)
660	&& !PATMIsPatchGCAddr(pDisInfo->pVM, uSrcAddr)))
661	{
662	Assert(!PATMIsPatchGCAddr(pDisInfo->pVM, uSrcAddr));
663	rc = PGMPhysSimpleReadGCPtr(&pDisInfo->pVM->aCpus[0], &pDis->abInstr[offInstr], uSrcAddr, cbMinRead);
664	offInstr += cbMinRead;
665	}
666	else
667	{
668	/*
669	* pbInstrHC is the base address; adjust according to the GC pointer.
670	*
671	* Try read the max number of bytes here. Since the disassembler only
672	* ever uses these bytes for the current instruction, it doesn't matter
673	* much if we accidentally read the start of the next instruction even
674	* if it happens to be a patch jump or int3.
675	*/
676	uint8_t const *pbInstrHC = pDisInfo->pbInstrHC; AssertPtr(pbInstrHC);
677	pbInstrHC += uSrcAddr - pDisInfo->pInstrGC;
678
679	size_t cbMaxRead1 = PAGE_SIZE - (uSrcAddr & PAGE_OFFSET_MASK);
680	size_t cbMaxRead2 = PAGE_SIZE - ((uintptr_t)pbInstrHC & PAGE_OFFSET_MASK);
681	size_t cbToRead = RT_MIN(cbMaxRead1, RT_MAX(cbMaxRead2, cbMinRead));
682	if (cbToRead > cbMaxRead)
683	cbToRead = cbMaxRead;
684
685	memcpy(&pDis->abInstr[offInstr], pbInstrHC, cbToRead);
686	offInstr += (uint8_t)cbToRead;
687	}
688
689	pDis->cbCachedInstr = offInstr;
690	return rc;
691	}
692
693
694	DECLINLINE(bool) patmR3DisInstrToStr(PVM pVM, PPATCHINFO pPatch, RTGCPTR32 InstrGCPtr32, uint8_t *pbInstrHC, uint32_t fReadFlags,
695	PDISCPUSTATE pCpu, uint32_t pcbInstr, char pszOutput, size_t cbOutput)
696	{
697	PATMDISASM disinfo;
698	disinfo.pVM = pVM;
699	disinfo.pPatchInfo = pPatch;
700	disinfo.pbInstrHC = pbInstrHC;
701	disinfo.pInstrGC = InstrGCPtr32;
702	disinfo.fReadFlags = fReadFlags;
703	return RT_SUCCESS(DISInstrToStrWithReader(InstrGCPtr32,
704	(pPatch->flags & PATMFL_CODE32) ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
705	patmReadBytes, &disinfo,
706	pCpu, pcbInstr, pszOutput, cbOutput));
707	}
708
709
710	DECLINLINE(bool) patmR3DisInstr(PVM pVM, PPATCHINFO pPatch, RTGCPTR32 InstrGCPtr32, uint8_t *pbInstrHC, uint32_t fReadFlags,
711	PDISCPUSTATE pCpu, uint32_t *pcbInstr)
712	{
713	PATMDISASM disinfo;
714	disinfo.pVM = pVM;
715	disinfo.pPatchInfo = pPatch;
716	disinfo.pbInstrHC = pbInstrHC;
717	disinfo.pInstrGC = InstrGCPtr32;
718	disinfo.fReadFlags = fReadFlags;
719	return RT_SUCCESS(DISInstrWithReader(InstrGCPtr32,
720	(pPatch->flags & PATMFL_CODE32) ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
721	patmReadBytes, &disinfo,
722	pCpu, pcbInstr));
723	}
724
725
726	DECLINLINE(bool) patmR3DisInstrNoStrOpMode(PVM pVM, PPATCHINFO pPatch, RTGCPTR32 InstrGCPtr32, uint8_t *pbInstrHC,
727	uint32_t fReadFlags,
728	PDISCPUSTATE pCpu, uint32_t *pcbInstr)
729	{
730	PATMDISASM disinfo;
731	disinfo.pVM = pVM;
732	disinfo.pPatchInfo = pPatch;
733	disinfo.pbInstrHC = pbInstrHC;
734	disinfo.pInstrGC = InstrGCPtr32;
735	disinfo.fReadFlags = fReadFlags;
736	return RT_SUCCESS(DISInstrWithReader(InstrGCPtr32, pPatch->uOpMode, patmReadBytes, &disinfo,
737	pCpu, pcbInstr));
738	}
739
740	#ifdef LOG_ENABLED
741	# define PATM_LOG_ORG_PATCH_INSTR(a_pVM, a_pPatch, a_szComment) \
742	PATM_LOG_PATCH_INSTR(a_pVM, a_pPatch, PATMREAD_ORGCODE, a_szComment, " patch:")
743	# define PATM_LOG_RAW_PATCH_INSTR(a_pVM, a_pPatch, a_szComment) \
744	PATM_LOG_PATCH_INSTR(a_pVM, a_pPatch, PATMREAD_RAWCODE, a_szComment, " patch:")
745
746	# define PATM_LOG_PATCH_INSTR(a_pVM, a_pPatch, a_fFlags, a_szComment1, a_szComment2) \
747	do { \
748	if (LogIsEnabled()) \
749	patmLogRawPatchInstr(a_pVM, a_pPatch, a_fFlags, a_szComment1, a_szComment2); \
750	} while (0)
751
752	static void patmLogRawPatchInstr(PVM pVM, PPATCHINFO pPatch, uint32_t fFlags,
753	const char pszComment1, const char pszComment2)
754	{
755	DISCPUSTATE DisState;
756	char szOutput[128];
757	szOutput[0] = '\0';
758	patmR3DisInstrToStr(pVM, pPatch, pPatch->pPrivInstrGC, NULL, fFlags,
759	&DisState, NULL, szOutput, sizeof(szOutput));
760	Log(("%s%s %s", pszComment1, pszComment2, szOutput));
761	}
762
763	#else
764	# define PATM_LOG_ORG_PATCH_INSTR(a_pVM, a_pPatch, a_szComment) do { } while (0)
765	# define PATM_LOG_RAW_PATCH_INSTR(a_pVM, a_pPatch, a_szComment) do { } while (0)
766	# define PATM_LOG_PATCH_INSTR(a_pVM, a_pPatch, a_fFlags, a_szComment1, a_szComment2) do { } while (0)
767	#endif
768
769
770	/**
771	* Callback function for RTAvloU32DoWithAll
772	*
773	* Updates all fixups in the patches
774	*
775	* @returns VBox status code.
776	* @param pNode Current node
777	* @param pParam Pointer to the VM.
778	*/
779	static DECLCALLBACK(int) patmR3RelocatePatches(PAVLOU32NODECORE pNode, void *pParam)
780	{
781	PPATMPATCHREC pPatch = (PPATMPATCHREC)pNode;
782	PVM pVM = (PVM)pParam;
783	RTRCINTPTR delta;
784	int rc;
785
786	/* Nothing to do if the patch is not active. */
787	if (pPatch->patch.uState == PATCH_REFUSED)
788	return 0;
789
790	if (pPatch->patch.flags & PATMFL_PATCHED_GUEST_CODE)
791	PATM_LOG_PATCH_INSTR(pVM, &pPatch->patch, PATMREAD_RAWCODE, "Org patch jump:", "");
792
793	Log(("Nr of fixups %d\n", pPatch->patch.nrFixups));
794	delta = (RTRCINTPTR)pVM->patm.s.deltaReloc;
795
796	/*
797	* Apply fixups.
798	*/
799	AVLPVKEY key = NULL;
800	for (;;)
801	{
802	/* Get the record that's closest from above (after or equal to key). */
803	PRELOCREC pRec = (PRELOCREC)RTAvlPVGetBestFit(&pPatch->patch.FixupTree, key, true);
804	if (!pRec)
805	break;
806
807	key = (uint8_t )pRec->Core.Key + 1; / search for the next record during the next round. */
808
809	switch (pRec->uType)
810	{
811	case FIXUP_ABSOLUTE_IN_PATCH_ASM_TMPL:
812	Assert(pRec->pDest == pRec->pSource); Assert(PATM_IS_ASMFIX(pRec->pSource));
813	Log(("Absolute patch template fixup type %#x at %RHv -> %RHv at %RRv\n", pRec->pSource, (RTRCUINTPTR )pRec->pRelocPos, (RTRCINTPTR)pRec->pRelocPos + delta, pRec->pRelocPos));
814	(RTRCUINTPTR )pRec->pRelocPos += delta;
815	break;
816
817	case FIXUP_ABSOLUTE:
818	Log(("Absolute fixup at %RRv %RHv -> %RHv at %RRv\n", pRec->pSource, (RTRCUINTPTR )pRec->pRelocPos, (RTRCINTPTR)pRec->pRelocPos + delta, pRec->pRelocPos));
819	if ( !pRec->pSource
820	\|\| PATMIsPatchGCAddr(pVM, pRec->pSource))
821	{
822	(RTRCUINTPTR )pRec->pRelocPos += delta;
823	}
824	else
825	{
826	uint8_t curInstr[15];
827	uint8_t oldInstr[15];
828	Assert(pRec->pSource && pPatch->patch.cbPrivInstr <= 15);
829
830	Assert(!(pPatch->patch.flags & PATMFL_GLOBAL_FUNCTIONS));
831
832	memcpy(oldInstr, pPatch->patch.aPrivInstr, pPatch->patch.cbPrivInstr);
833	(RTRCPTR )&oldInstr[pPatch->patch.cbPrivInstr - sizeof(RTRCPTR)] = pRec->pDest;
834
835	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), curInstr, pPatch->patch.pPrivInstrGC, pPatch->patch.cbPrivInstr);
836	Assert(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
837
838	pRec->pDest = (RTRCPTR)((RTRCUINTPTR)pRec->pDest + delta);
839
840	if ( rc == VERR_PAGE_NOT_PRESENT
841	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
842	{
843	RTRCPTR pPage = pPatch->patch.pPrivInstrGC & PAGE_BASE_GC_MASK;
844
845	Log(("PATM: Patch page not present -> check later!\n"));
846	rc = PGMR3HandlerVirtualRegister(pVM, VMMGetCpu(pVM), pVM->patm.s.hMonitorPageType,
847	pPage,
848	pPage + (PAGE_SIZE - 1) /* inclusive! */,
849	(void )(uintptr_t)pPage, pPage, NULL /pszDesc*/);
850	Assert(RT_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT);
851	}
852	else
853	if (memcmp(curInstr, oldInstr, pPatch->patch.cbPrivInstr))
854	{
855	Log(("PATM: Patch was overwritten -> disabling patch!!\n"));
856	/*
857	* Disable patch; this is not a good solution
858	*/
859	/** @todo hopefully it was completely overwritten (if the read was successful)!!!! */
860	pPatch->patch.uState = PATCH_DISABLED;
861	}
862	else
863	if (RT_SUCCESS(rc))
864	{
865	(RTRCPTR )&curInstr[pPatch->patch.cbPrivInstr - sizeof(RTRCPTR)] = pRec->pDest;
866	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pRec->pSource, curInstr, pPatch->patch.cbPrivInstr);
867	AssertRC(rc);
868	}
869	}
870	break;
871
872	case FIXUP_REL_JMPTOPATCH:
873	{
874	RTRCPTR pTarget = (RTRCPTR)((RTRCINTPTR)pRec->pDest + delta);
875
876	if ( pPatch->patch.uState == PATCH_ENABLED
877	&& (pPatch->patch.flags & PATMFL_PATCHED_GUEST_CODE))
878	{
879	uint8_t oldJump[SIZEOF_NEAR_COND_JUMP32];
880	uint8_t temp[SIZEOF_NEAR_COND_JUMP32];
881	RTRCPTR pJumpOffGC;
882	RTRCINTPTR displ = (RTRCINTPTR)pTarget - (RTRCINTPTR)pRec->pSource;
883	RTRCINTPTR displOld= (RTRCINTPTR)pRec->pDest - (RTRCINTPTR)pRec->pSource;
884
885	#if 0 /** @todo '(int32_t)pRec->pRelocPos' crashes on restore of an XP VM here. pRelocPos=0x8000dbe2180a (bird) */
886	Log(("Relative fixup (g2p) %08X -> %08X at %08X (source=%08x, target=%08x)\n", (int32_t)pRec->pRelocPos, displ, pRec->pRelocPos, pRec->pSource, pRec->pDest));
887	#else
888	Log(("Relative fixup (g2p) ???????? -> %08X at %08X (source=%08x, target=%08x)\n", displ, pRec->pRelocPos, pRec->pSource, pRec->pDest));
889	#endif
890
891	Assert(pRec->pSource - pPatch->patch.cbPatchJump == pPatch->patch.pPrivInstrGC);
892	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
893	if (pPatch->patch.cbPatchJump == SIZEOF_NEAR_COND_JUMP32)
894	{
895	Assert(pPatch->patch.flags & PATMFL_JUMP_CONFLICT);
896
897	pJumpOffGC = pPatch->patch.pPrivInstrGC + 2; //two byte opcode
898	oldJump[0] = pPatch->patch.aPrivInstr[0];
899	oldJump[1] = pPatch->patch.aPrivInstr[1];
900	(RTRCUINTPTR )&oldJump[2] = displOld;
901	}
902	else
903	#endif
904	if (pPatch->patch.cbPatchJump == SIZEOF_NEARJUMP32)
905	{
906	pJumpOffGC = pPatch->patch.pPrivInstrGC + 1; //one byte opcode
907	oldJump[0] = 0xE9;
908	(RTRCUINTPTR )&oldJump[1] = displOld;
909	}
910	else
911	{
912	AssertMsgFailed(("Invalid patch jump size %d\n", pPatch->patch.cbPatchJump));
913	continue; //this should never happen!!
914	}
915	Assert(pPatch->patch.cbPatchJump <= sizeof(temp));
916
917	/*
918	* Read old patch jump and compare it to the one we previously installed
919	*/
920	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), temp, pPatch->patch.pPrivInstrGC, pPatch->patch.cbPatchJump);
921	Assert(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
922
923	if ( rc == VERR_PAGE_NOT_PRESENT
924	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
925	{
926	RTRCPTR pPage = pPatch->patch.pPrivInstrGC & PAGE_BASE_GC_MASK;
927	Log(("PATM: Patch page not present -> check later!\n"));
928	rc = PGMR3HandlerVirtualRegister(pVM, VMMGetCpu(pVM), pVM->patm.s.hMonitorPageType,
929	pPage,
930	pPage + (PAGE_SIZE - 1) /* inclusive! */,
931	(void )(uintptr_t)pPage, pPage, NULL /pszDesc*/);
932	Assert(RT_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT);
933	}
934	else
935	if (memcmp(temp, oldJump, pPatch->patch.cbPatchJump))
936	{
937	Log(("PATM: Patch jump was overwritten -> disabling patch!!\n"));
938	/*
939	* Disable patch; this is not a good solution
940	*/
941	/** @todo hopefully it was completely overwritten (if the read was successful)!!!! */
942	pPatch->patch.uState = PATCH_DISABLED;
943	}
944	else
945	if (RT_SUCCESS(rc))
946	{
947	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pJumpOffGC, &displ, sizeof(displ));
948	AssertRC(rc);
949	}
950	else
951	AssertMsgFailed(("Unexpected error %d from MMR3PhysReadGCVirt\n", rc));
952	}
953	else
954	Log(("Skip the guest jump to patch code for this disabled patch %RGv - %08X\n", pPatch->patch.pPrivInstrGC, pRec->pRelocPos));
955
956	pRec->pDest = pTarget;
957	break;
958	}
959
960	case FIXUP_REL_JMPTOGUEST:
961	{
962	RTRCPTR pSource = (RTRCPTR)((RTRCINTPTR)pRec->pSource + delta);
963	RTRCINTPTR displ = (RTRCINTPTR)pRec->pDest - (RTRCINTPTR)pSource;
964
965	Assert(!(pPatch->patch.flags & PATMFL_GLOBAL_FUNCTIONS));
966	Log(("Relative fixup (p2g) %08X -> %08X at %08X (source=%08x, target=%08x)\n", (int32_t)pRec->pRelocPos, displ, pRec->pRelocPos, pRec->pSource, pRec->pDest));
967	(RTRCUINTPTR )pRec->pRelocPos = displ;
968	pRec->pSource = pSource;
969	break;
970	}
971
972	case FIXUP_REL_HELPER_IN_PATCH_ASM_TMPL:
973	case FIXUP_CONSTANT_IN_PATCH_ASM_TMPL:
974	/* Only applicable when loading state. */
975	Assert(pRec->pDest == pRec->pSource);
976	Assert(PATM_IS_ASMFIX(pRec->pSource));
977	break;
978
979	default:
980	AssertMsg(0, ("Invalid fixup type!!\n"));
981	return VERR_INVALID_PARAMETER;
982	}
983	}
984
985	if (pPatch->patch.flags & PATMFL_PATCHED_GUEST_CODE)
986	PATM_LOG_PATCH_INSTR(pVM, &pPatch->patch, PATMREAD_RAWCODE, "Rel patch jump:", "");
987	return 0;
988	}
989
990	#ifdef VBOX_WITH_DEBUGGER
991
992	/**
993	* Callback function for RTAvloU32DoWithAll
994	*
995	* Enables the patch that's being enumerated
996	*
997	* @returns 0 (continue enumeration).
998	* @param pNode Current node
999	* @param pVM The cross context VM structure.
1000	*/
1001	static DECLCALLBACK(int) EnableAllPatches(PAVLOU32NODECORE pNode, void *pVM)
1002	{
1003	PPATMPATCHREC pPatch = (PPATMPATCHREC)pNode;
1004
1005	PATMR3EnablePatch((PVM)pVM, (RTRCPTR)pPatch->Core.Key);
1006	return 0;
1007	}
1008
1009
1010	/**
1011	* Callback function for RTAvloU32DoWithAll
1012	*
1013	* Disables the patch that's being enumerated
1014	*
1015	* @returns 0 (continue enumeration).
1016	* @param pNode Current node
1017	* @param pVM The cross context VM structure.
1018	*/
1019	static DECLCALLBACK(int) DisableAllPatches(PAVLOU32NODECORE pNode, void *pVM)
1020	{
1021	PPATMPATCHREC pPatch = (PPATMPATCHREC)pNode;
1022
1023	PATMR3DisablePatch((PVM)pVM, (RTRCPTR)pPatch->Core.Key);
1024	return 0;
1025	}
1026
1027	#endif /* VBOX_WITH_DEBUGGER */
1028
1029	/**
1030	* Returns the host context pointer of the GC context structure
1031	*
1032	* @returns VBox status code.
1033	* @param pVM The cross context VM structure.
1034	*/
1035	VMMR3_INT_DECL(PPATMGCSTATE) PATMR3QueryGCStateHC(PVM pVM)
1036	{
1037	AssertReturn(!HMIsEnabled(pVM), NULL);
1038	return pVM->patm.s.pGCStateHC;
1039	}
1040
1041
1042	/**
1043	* Allows or disallow patching of privileged instructions executed by the guest OS
1044	*
1045	* @returns VBox status code.
1046	* @param pUVM The user mode VM handle.
1047	* @param fAllowPatching Allow/disallow patching
1048	*/
1049	VMMR3DECL(int) PATMR3AllowPatching(PUVM pUVM, bool fAllowPatching)
1050	{
1051	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
1052	PVM pVM = pUVM->pVM;
1053	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1054
1055	if (!HMIsEnabled(pVM))
1056	pVM->fPATMEnabled = fAllowPatching;
1057	else
1058	Assert(!pVM->fPATMEnabled);
1059	return VINF_SUCCESS;
1060	}
1061
1062
1063	/**
1064	* Checks if the patch manager is enabled or not.
1065	*
1066	* @returns true if enabled, false if not (or if invalid handle).
1067	* @param pUVM The user mode VM handle.
1068	*/
1069	VMMR3DECL(bool) PATMR3IsEnabled(PUVM pUVM)
1070	{
1071	UVM_ASSERT_VALID_EXT_RETURN(pUVM, false);
1072	PVM pVM = pUVM->pVM;
1073	VM_ASSERT_VALID_EXT_RETURN(pVM, false);
1074	return PATMIsEnabled(pVM);
1075	}
1076
1077
1078	/**
1079	* Convert a GC patch block pointer to a HC patch pointer
1080	*
1081	* @returns HC pointer or NULL if it's not a GC patch pointer
1082	* @param pVM The cross context VM structure.
1083	* @param pAddrGC GC pointer
1084	*/
1085	VMMR3_INT_DECL(void *) PATMR3GCPtrToHCPtr(PVM pVM, RTRCPTR pAddrGC)
1086	{
1087	AssertReturn(!HMIsEnabled(pVM), NULL);
1088	RTRCUINTPTR offPatch = (RTRCUINTPTR)pAddrGC - (RTRCUINTPTR)pVM->patm.s.pPatchMemGC;
1089	if (offPatch >= pVM->patm.s.cbPatchMem)
1090	{
1091	offPatch = (RTRCUINTPTR)pAddrGC - (RTRCUINTPTR)pVM->patm.s.pbPatchHelpersRC;
1092	if (offPatch >= pVM->patm.s.cbPatchHelpers)
1093	return NULL;
1094	return pVM->patm.s.pbPatchHelpersR3 + offPatch;
1095	}
1096	return pVM->patm.s.pPatchMemHC + offPatch;
1097	}
1098
1099
1100	/**
1101	* Convert guest context address to host context pointer
1102	*
1103	* @returns VBox status code.
1104	* @param pVM The cross context VM structure.
1105	* @param pCacheRec Address conversion cache record
1106	* @param pGCPtr Guest context pointer
1107	*
1108	* @returns Host context pointer or NULL in case of an error
1109	*
1110	*/
1111	R3PTRTYPE(uint8_t ) patmR3GCVirtToHCVirt(PVM pVM, PPATMP2GLOOKUPREC pCacheRec, RCPTRTYPE(uint8_t ) pGCPtr)
1112	{
1113	int rc;
1114	R3PTRTYPE(uint8_t *) pHCPtr;
1115	uint32_t offset;
1116
1117	offset = (RTRCUINTPTR)pGCPtr - (RTRCUINTPTR)pVM->patm.s.pPatchMemGC;
1118	if (offset < pVM->patm.s.cbPatchMem)
1119	{
1120	#ifdef VBOX_STRICT
1121	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
1122	Assert(pPatch); Assert(offset - pPatch->pPatchBlockOffset < pPatch->cbPatchBlockSize);
1123	#endif
1124	return pVM->patm.s.pPatchMemHC + offset;
1125	}
1126	/* Note! We're _not_ including the patch helpers here. */
1127
1128	offset = pGCPtr & PAGE_OFFSET_MASK;
1129	if (pCacheRec->pGuestLoc == (pGCPtr & PAGE_BASE_GC_MASK))
1130	return pCacheRec->pPageLocStartHC + offset;
1131
1132	/* Release previous lock if any. */
1133	if (pCacheRec->Lock.pvMap)
1134	{
1135	PGMPhysReleasePageMappingLock(pVM, &pCacheRec->Lock);
1136	pCacheRec->Lock.pvMap = NULL;
1137	}
1138
1139	rc = PGMPhysGCPtr2CCPtrReadOnly(VMMGetCpu(pVM), pGCPtr, (const void **)&pHCPtr, &pCacheRec->Lock);
1140	if (rc != VINF_SUCCESS)
1141	{
1142	AssertMsg(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("MMR3PhysGCVirt2HCVirtEx failed for %08X\n", pGCPtr));
1143	return NULL;
1144	}
1145	pCacheRec->pPageLocStartHC = (R3PTRTYPE(uint8_t*))((RTHCUINTPTR)pHCPtr & PAGE_BASE_HC_MASK);
1146	pCacheRec->pGuestLoc = pGCPtr & PAGE_BASE_GC_MASK;
1147	return pHCPtr;
1148	}
1149
1150
1151	/**
1152	* Calculates and fills in all branch targets
1153	*
1154	* @returns VBox status code.
1155	* @param pVM The cross context VM structure.
1156	* @param pPatch Current patch block pointer
1157	*
1158	*/
1159	static int patmr3SetBranchTargets(PVM pVM, PPATCHINFO pPatch)
1160	{
1161	int32_t displ;
1162
1163	PJUMPREC pRec = 0;
1164	unsigned nrJumpRecs = 0;
1165
1166	/*
1167	* Set all branch targets inside the patch block.
1168	* We remove all jump records as they are no longer needed afterwards.
1169	*/
1170	while (true)
1171	{
1172	RCPTRTYPE(uint8_t *) pInstrGC;
1173	RCPTRTYPE(uint8_t *) pBranchTargetGC = 0;
1174
1175	pRec = (PJUMPREC)RTAvlPVRemoveBestFit(&pPatch->JumpTree, 0, true);
1176	if (pRec == 0)
1177	break;
1178
1179	nrJumpRecs++;
1180
1181	/* HC in patch block to GC in patch block. */
1182	pInstrGC = patmPatchHCPtr2PatchGCPtr(pVM, pRec->pJumpHC);
1183
1184	if (pRec->opcode == OP_CALL)
1185	{
1186	/* Special case: call function replacement patch from this patch block.
1187	*/
1188	PPATMPATCHREC pFunctionRec = patmQueryFunctionPatch(pVM, pRec->pTargetGC);
1189	if (!pFunctionRec)
1190	{
1191	int rc;
1192
1193	if (PATMR3HasBeenPatched(pVM, pRec->pTargetGC) == false)
1194	rc = PATMR3InstallPatch(pVM, pRec->pTargetGC, PATMFL_CODE32 \| PATMFL_DUPLICATE_FUNCTION);
1195	else
1196	rc = VERR_PATCHING_REFUSED; /* exists as a normal patch; can't use it */
1197
1198	if (RT_FAILURE(rc))
1199	{
1200	uint8_t *pPatchHC;
1201	RTRCPTR pPatchGC;
1202	RTRCPTR pOrgInstrGC;
1203
1204	pOrgInstrGC = PATMR3PatchToGCPtr(pVM, pInstrGC, 0);
1205	Assert(pOrgInstrGC);
1206
1207	/* Failure for some reason -> mark exit point with int 3. */
1208	Log(("Failed to install function replacement patch (at %x) for reason %Rrc\n", pOrgInstrGC, rc));
1209
1210	pPatchGC = patmGuestGCPtrToPatchGCPtr(pVM, pPatch, pOrgInstrGC);
1211	Assert(pPatchGC);
1212
1213	pPatchHC = pVM->patm.s.pPatchMemHC + (pPatchGC - pVM->patm.s.pPatchMemGC);
1214
1215	/* Set a breakpoint at the very beginning of the recompiled instruction */
1216	*pPatchHC = 0xCC;
1217
1218	continue;
1219	}
1220	}
1221	else
1222	{
1223	Log(("Patch block %RRv called as function\n", pFunctionRec->patch.pPrivInstrGC));
1224	pFunctionRec->patch.flags \|= PATMFL_CODE_REFERENCED;
1225	}
1226
1227	pBranchTargetGC = PATMR3QueryPatchGCPtr(pVM, pRec->pTargetGC);
1228	}
1229	else
1230	pBranchTargetGC = patmGuestGCPtrToPatchGCPtr(pVM, pPatch, pRec->pTargetGC);
1231
1232	if (pBranchTargetGC == 0)
1233	{
1234	AssertMsgFailed(("patmr3SetBranchTargets: patmGuestGCPtrToPatchGCPtr failed for %08X\n", pRec->pTargetGC));
1235	return VERR_PATCHING_REFUSED;
1236	}
1237	/* Our jumps always have a dword displacement (to make things easier). */
1238	Assert(sizeof(uint32_t) == sizeof(RTRCPTR));
1239	displ = pBranchTargetGC - (pInstrGC + pRec->offDispl + sizeof(RTRCPTR));
1240	(RTRCPTR )(pRec->pJumpHC + pRec->offDispl) = displ;
1241	Log(("Set branch target %d to %08X : %08x - (%08x + %d + %d)\n", nrJumpRecs, displ, pBranchTargetGC, pInstrGC, pRec->offDispl, sizeof(RTRCPTR)));
1242	}
1243	Assert(nrJumpRecs == pPatch->nrJumpRecs);
1244	Assert(pPatch->JumpTree == 0);
1245	return VINF_SUCCESS;
1246	}
1247
1248	/**
1249	* Add an illegal instruction record
1250	*
1251	* @param pVM The cross context VM structure.
1252	* @param pPatch Patch structure ptr
1253	* @param pInstrGC Guest context pointer to privileged instruction
1254	*
1255	*/
1256	static void patmAddIllegalInstrRecord(PVM pVM, PPATCHINFO pPatch, RTRCPTR pInstrGC)
1257	{
1258	PAVLPVNODECORE pRec;
1259
1260	pRec = (PAVLPVNODECORE)MMR3HeapAllocZ(pVM, MM_TAG_PATM_PATCH, sizeof(*pRec));
1261	Assert(pRec);
1262	pRec->Key = (AVLPVKEY)(uintptr_t)pInstrGC;
1263
1264	bool ret = RTAvlPVInsert(&pPatch->pTempInfo->IllegalInstrTree, pRec);
1265	Assert(ret); NOREF(ret);
1266	pPatch->pTempInfo->nrIllegalInstr++;
1267	}
1268
1269	static bool patmIsIllegalInstr(PPATCHINFO pPatch, RTRCPTR pInstrGC)
1270	{
1271	PAVLPVNODECORE pRec;
1272
1273	pRec = RTAvlPVGet(&pPatch->pTempInfo->IllegalInstrTree, (AVLPVKEY)(uintptr_t)pInstrGC);
1274	if (pRec)
1275	return true;
1276	else
1277	return false;
1278	}
1279
1280	/**
1281	* Add a patch to guest lookup record
1282	*
1283	* @param pVM The cross context VM structure.
1284	* @param pPatch Patch structure ptr
1285	* @param pPatchInstrHC Guest context pointer to patch block
1286	* @param pInstrGC Guest context pointer to privileged instruction
1287	* @param enmType Lookup type
1288	* @param fDirty Dirty flag
1289	*
1290	* @note Be extremely careful with this function. Make absolutely sure the guest
1291	* address is correct! (to avoid executing instructions twice!)
1292	*/
1293	void patmR3AddP2GLookupRecord(PVM pVM, PPATCHINFO pPatch, uint8_t *pPatchInstrHC, RTRCPTR pInstrGC, PATM_LOOKUP_TYPE enmType, bool fDirty)
1294	{
1295	bool ret;
1296	PRECPATCHTOGUEST pPatchToGuestRec;
1297	PRECGUESTTOPATCH pGuestToPatchRec;
1298	uint32_t PatchOffset = pPatchInstrHC - pVM->patm.s.pPatchMemHC; /* Offset in memory reserved for PATM. */
1299
1300	LogFlowFunc(("pVM=%#p pPatch=%#p pPatchInstrHC=%#p pInstrGC=%#x enmType=%d fDirty=%RTbool\n",
1301	pVM, pPatch, pPatchInstrHC, pInstrGC, enmType, fDirty));
1302
1303	if (enmType == PATM_LOOKUP_PATCH2GUEST)
1304	{
1305	pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32Get(&pPatch->Patch2GuestAddrTree, PatchOffset);
1306	if (pPatchToGuestRec && pPatchToGuestRec->Core.Key == PatchOffset)
1307	return; /* already there */
1308
1309	Assert(!pPatchToGuestRec);
1310	}
1311	#ifdef VBOX_STRICT
1312	else
1313	{
1314	pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32Get(&pPatch->Patch2GuestAddrTree, PatchOffset);
1315	Assert(!pPatchToGuestRec);
1316	}
1317	#endif
1318
1319	pPatchToGuestRec = (PRECPATCHTOGUEST)MMR3HeapAllocZ(pVM, MM_TAG_PATM_PATCH, sizeof(RECPATCHTOGUEST) + sizeof(RECGUESTTOPATCH));
1320	Assert(pPatchToGuestRec);
1321	pPatchToGuestRec->Core.Key = PatchOffset;
1322	pPatchToGuestRec->pOrgInstrGC = pInstrGC;
1323	pPatchToGuestRec->enmType = enmType;
1324	pPatchToGuestRec->fDirty = fDirty;
1325
1326	ret = RTAvlU32Insert(&pPatch->Patch2GuestAddrTree, &pPatchToGuestRec->Core);
1327	Assert(ret);
1328
1329	/* GC to patch address */
1330	if (enmType == PATM_LOOKUP_BOTHDIR)
1331	{
1332	pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32Get(&pPatch->Guest2PatchAddrTree, pInstrGC);
1333	if (!pGuestToPatchRec)
1334	{
1335	pGuestToPatchRec = (PRECGUESTTOPATCH)(pPatchToGuestRec+1);
1336	pGuestToPatchRec->Core.Key = pInstrGC;
1337	pGuestToPatchRec->PatchOffset = PatchOffset;
1338
1339	ret = RTAvlU32Insert(&pPatch->Guest2PatchAddrTree, &pGuestToPatchRec->Core);
1340	Assert(ret);
1341	}
1342	}
1343
1344	pPatch->nrPatch2GuestRecs++;
1345	}
1346
1347
1348	/**
1349	* Removes a patch to guest lookup record
1350	*
1351	* @param pVM The cross context VM structure.
1352	* @param pPatch Patch structure ptr
1353	* @param pPatchInstrGC Guest context pointer to patch block
1354	*/
1355	void patmr3RemoveP2GLookupRecord(PVM pVM, PPATCHINFO pPatch, RTRCPTR pPatchInstrGC)
1356	{
1357	PAVLU32NODECORE pNode;
1358	PAVLU32NODECORE pNode2;
1359	PRECPATCHTOGUEST pPatchToGuestRec;
1360	uint32_t PatchOffset = pPatchInstrGC - pVM->patm.s.pPatchMemGC; /* Offset in memory reserved for PATM. */
1361
1362	pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32Get(&pPatch->Patch2GuestAddrTree, PatchOffset);
1363	Assert(pPatchToGuestRec);
1364	if (pPatchToGuestRec)
1365	{
1366	if (pPatchToGuestRec->enmType == PATM_LOOKUP_BOTHDIR)
1367	{
1368	PRECGUESTTOPATCH pGuestToPatchRec = (PRECGUESTTOPATCH)(pPatchToGuestRec+1);
1369
1370	Assert(pGuestToPatchRec->Core.Key);
1371	pNode2 = RTAvlU32Remove(&pPatch->Guest2PatchAddrTree, pGuestToPatchRec->Core.Key);
1372	Assert(pNode2);
1373	}
1374	pNode = RTAvlU32Remove(&pPatch->Patch2GuestAddrTree, pPatchToGuestRec->Core.Key);
1375	Assert(pNode);
1376
1377	MMR3HeapFree(pPatchToGuestRec);
1378	pPatch->nrPatch2GuestRecs--;
1379	}
1380	}
1381
1382
1383	/**
1384	* RTAvlPVDestroy callback.
1385	*/
1386	static DECLCALLBACK(int) patmEmptyTreePVCallback(PAVLPVNODECORE pNode, void *)
1387	{
1388	MMR3HeapFree(pNode);
1389	return 0;
1390	}
1391
1392	/**
1393	* Empty the specified tree (PV tree, MMR3 heap)
1394	*
1395	* @param pVM The cross context VM structure.
1396	* @param ppTree Tree to empty
1397	*/
1398	static void patmEmptyTree(PVM pVM, PAVLPVNODECORE *ppTree)
1399	{
1400	NOREF(pVM);
1401	RTAvlPVDestroy(ppTree, patmEmptyTreePVCallback, NULL);
1402	}
1403
1404
1405	/**
1406	* RTAvlU32Destroy callback.
1407	*/
1408	static DECLCALLBACK(int) patmEmptyTreeU32Callback(PAVLU32NODECORE pNode, void *)
1409	{
1410	MMR3HeapFree(pNode);
1411	return 0;
1412	}
1413
1414	/**
1415	* Empty the specified tree (U32 tree, MMR3 heap)
1416	*
1417	* @param pVM The cross context VM structure.
1418	* @param ppTree Tree to empty
1419	*/
1420	static void patmEmptyTreeU32(PVM pVM, PPAVLU32NODECORE ppTree)
1421	{
1422	NOREF(pVM);
1423	RTAvlU32Destroy(ppTree, patmEmptyTreeU32Callback, NULL);
1424	}
1425
1426
1427	/**
1428	* Analyses the instructions following the cli for compliance with our heuristics for cli & pushf
1429	*
1430	* @returns VBox status code.
1431	* @param pVM The cross context VM structure.
1432	* @param pCpu CPU disassembly state
1433	* @param pInstrGC Guest context pointer to privileged instruction
1434	* @param pCurInstrGC Guest context pointer to the current instruction
1435	* @param pCacheRec Cache record ptr
1436	*
1437	*/
1438	static int patmAnalyseBlockCallback(PVM pVM, DISCPUSTATE pCpu, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t *) pCurInstrGC, PPATMP2GLOOKUPREC pCacheRec)
1439	{
1440	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
1441	bool fIllegalInstr = false;
1442
1443	/*
1444	* Preliminary heuristics:
1445	*- no call instructions without a fixed displacement between cli and sti/popf
1446	*- no jumps in the instructions following cli (4+ bytes; enough for the replacement jump (5 bytes))
1447	*- no nested pushf/cli
1448	*- sti/popf should be the (eventual) target of all branches
1449	*- no near or far returns; no int xx, no into
1450	*
1451	* Note: Later on we can impose less stricter guidelines if the need arises
1452	*/
1453
1454	/* Bail out if the patch gets too big. */
1455	if (pPatch->cbPatchBlockSize >= MAX_PATCH_SIZE)
1456	{
1457	Log(("Code block too big (%x) for patch at %RRv!!\n", pPatch->cbPatchBlockSize, pCurInstrGC));
1458	fIllegalInstr = true;
1459	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1460	}
1461	else
1462	{
1463	/* No unconditional jumps or calls without fixed displacements. */
1464	if ( (pCpu->pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
1465	&& (pCpu->pCurInstr->uOpcode == OP_JMP \|\| pCpu->pCurInstr->uOpcode == OP_CALL)
1466	)
1467	{
1468	Assert(pCpu->Param1.cb <= 4 \|\| pCpu->Param1.cb == 6);
1469	if ( pCpu->Param1.cb == 6 /* far call/jmp */
1470	\|\| (pCpu->pCurInstr->uOpcode == OP_CALL && !(pPatch->flags & PATMFL_SUPPORT_CALLS))
1471	\|\| (OP_PARM_VTYPE(pCpu->pCurInstr->fParam1) != OP_PARM_J && !(pPatch->flags & PATMFL_SUPPORT_INDIRECT_CALLS))
1472	)
1473	{
1474	fIllegalInstr = true;
1475	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1476	}
1477	}
1478
1479	/* An unconditional (short) jump right after a cli is a potential problem; we will overwrite whichever function comes afterwards */
1480	if (pPatch->opcode == OP_CLI && pCpu->pCurInstr->uOpcode == OP_JMP)
1481	{
1482	if ( pCurInstrGC > pPatch->pPrivInstrGC
1483	&& pCurInstrGC + pCpu->cbInstr < pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32) /* hardcoded patch jump size; cbPatchJump is still zero */
1484	{
1485	Log(("Dangerous unconditional jump ends in our generated patch jump!! (%x vs %x)\n", pCurInstrGC, pPatch->pPrivInstrGC));
1486	/* We turn this one into a int 3 callable patch. */
1487	pPatch->flags \|= PATMFL_INT3_REPLACEMENT_BLOCK;
1488	}
1489	}
1490	else
1491	/* no nested pushfs just yet; nested cli is allowed for cli patches though. */
1492	if (pPatch->opcode == OP_PUSHF)
1493	{
1494	if (pCurInstrGC != pInstrGC && pCpu->pCurInstr->uOpcode == OP_PUSHF)
1495	{
1496	fIllegalInstr = true;
1497	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1498	}
1499	}
1500
1501	/* no far returns */
1502	if (pCpu->pCurInstr->uOpcode == OP_RETF)
1503	{
1504	pPatch->pTempInfo->nrRetInstr++;
1505	fIllegalInstr = true;
1506	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1507	}
1508	else if ( pCpu->pCurInstr->uOpcode == OP_INT3
1509	\|\| pCpu->pCurInstr->uOpcode == OP_INT
1510	\|\| pCpu->pCurInstr->uOpcode == OP_INTO)
1511	{
1512	/* No int xx or into either. */
1513	fIllegalInstr = true;
1514	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1515	}
1516	}
1517
1518	pPatch->cbPatchBlockSize += pCpu->cbInstr;
1519
1520	/* Illegal instruction -> end of analysis phase for this code block */
1521	if (fIllegalInstr \|\| patmIsIllegalInstr(pPatch, pCurInstrGC))
1522	return VINF_SUCCESS;
1523
1524	/* Check for exit points. */
1525	switch (pCpu->pCurInstr->uOpcode)
1526	{
1527	case OP_SYSEXIT:
1528	return VINF_SUCCESS; /* duplicate it; will fault or emulated in GC. */
1529
1530	case OP_SYSENTER:
1531	case OP_ILLUD2:
1532	/* This appears to be some kind of kernel panic in Linux 2.4; no point to analyse more. */
1533	Log(("Illegal opcode (0xf 0xb) -> return here\n"));
1534	return VINF_SUCCESS;
1535
1536	case OP_STI:
1537	case OP_POPF:
1538	Assert(!(pPatch->flags & (PATMFL_DUPLICATE_FUNCTION)));
1539	/* If out exit point lies within the generated patch jump, then we have to refuse!! */
1540	if (pCurInstrGC > pPatch->pPrivInstrGC && pCurInstrGC < pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32) /* hardcoded patch jump size; cbPatchJump is still zero */
1541	{
1542	Log(("Exit point within patch jump itself!! (%x vs %x)\n", pCurInstrGC, pPatch->pPrivInstrGC));
1543	return VERR_PATCHING_REFUSED;
1544	}
1545	if (pPatch->opcode == OP_PUSHF)
1546	{
1547	if (pCpu->pCurInstr->uOpcode == OP_POPF)
1548	{
1549	if (pPatch->cbPatchBlockSize >= SIZEOF_NEARJUMP32)
1550	return VINF_SUCCESS;
1551
1552	/* Or else we need to duplicate more instructions, because we can't jump back yet! */
1553	Log(("WARNING: End of block reached, but we need to duplicate some extra instruction to avoid a conflict with the patch jump\n"));
1554	pPatch->flags \|= PATMFL_CHECK_SIZE;
1555	}
1556	break; /* sti doesn't mark the end of a pushf block; only popf does. */
1557	}
1558	/* fall thru */
1559	case OP_RETN: /* exit point for function replacement */
1560	return VINF_SUCCESS;
1561
1562	case OP_IRET:
1563	return VINF_SUCCESS; /* exitpoint */
1564
1565	case OP_CPUID:
1566	case OP_CALL:
1567	case OP_JMP:
1568	break;
1569
1570	#ifdef VBOX_WITH_SAFE_STR /** @todo remove DISOPTYPE_PRIVILEGED_NOTRAP from disasm table */
1571	case OP_STR:
1572	break;
1573	#endif
1574
1575	default:
1576	if (pCpu->pCurInstr->fOpType & (DISOPTYPE_PRIVILEGED_NOTRAP))
1577	{
1578	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1579	return VINF_SUCCESS; /* exit point */
1580	}
1581	break;
1582	}
1583
1584	/* If single instruction patch, we've copied enough instructions and the current instruction is not a relative jump. */
1585	if ((pPatch->flags & PATMFL_CHECK_SIZE) && pPatch->cbPatchBlockSize > SIZEOF_NEARJUMP32 && !(pCpu->pCurInstr->fOpType & DISOPTYPE_RELATIVE_CONTROLFLOW))
1586	{
1587	/* The end marker for this kind of patch is any instruction at a location outside our patch jump. */
1588	Log(("End of block at %RRv size %d\n", pCurInstrGC, pCpu->cbInstr));
1589	return VINF_SUCCESS;
1590	}
1591
1592	return VWRN_CONTINUE_ANALYSIS;
1593	}
1594
1595	/**
1596	* Analyses the instructions inside a function for compliance
1597	*
1598	* @returns VBox status code.
1599	* @param pVM The cross context VM structure.
1600	* @param pCpu CPU disassembly state
1601	* @param pInstrGC Guest context pointer to privileged instruction
1602	* @param pCurInstrGC Guest context pointer to the current instruction
1603	* @param pCacheRec Cache record ptr
1604	*
1605	*/
1606	static int patmAnalyseFunctionCallback(PVM pVM, DISCPUSTATE pCpu, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t *) pCurInstrGC, PPATMP2GLOOKUPREC pCacheRec)
1607	{
1608	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
1609	bool fIllegalInstr = false;
1610	NOREF(pInstrGC);
1611
1612	//Preliminary heuristics:
1613	//- no call instructions
1614	//- ret ends a block
1615
1616	Assert(pPatch->flags & (PATMFL_DUPLICATE_FUNCTION));
1617
1618	// bail out if the patch gets too big
1619	if (pPatch->cbPatchBlockSize >= MAX_PATCH_SIZE)
1620	{
1621	Log(("Code block too big (%x) for function patch at %RRv!!\n", pPatch->cbPatchBlockSize, pCurInstrGC));
1622	fIllegalInstr = true;
1623	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1624	}
1625	else
1626	{
1627	// no unconditional jumps or calls without fixed displacements
1628	if ( (pCpu->pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
1629	&& (pCpu->pCurInstr->uOpcode == OP_JMP \|\| pCpu->pCurInstr->uOpcode == OP_CALL)
1630	)
1631	{
1632	Assert(pCpu->Param1.cb <= 4 \|\| pCpu->Param1.cb == 6);
1633	if ( pCpu->Param1.cb == 6 /* far call/jmp */
1634	\|\| (pCpu->pCurInstr->uOpcode == OP_CALL && !(pPatch->flags & PATMFL_SUPPORT_CALLS))
1635	\|\| (OP_PARM_VTYPE(pCpu->pCurInstr->fParam1) != OP_PARM_J && !(pPatch->flags & PATMFL_SUPPORT_INDIRECT_CALLS))
1636	)
1637	{
1638	fIllegalInstr = true;
1639	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1640	}
1641	}
1642	else /* no far returns */
1643	if (pCpu->pCurInstr->uOpcode == OP_RETF)
1644	{
1645	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1646	fIllegalInstr = true;
1647	}
1648	else /* no int xx or into either */
1649	if (pCpu->pCurInstr->uOpcode == OP_INT3 \|\| pCpu->pCurInstr->uOpcode == OP_INT \|\| pCpu->pCurInstr->uOpcode == OP_INTO)
1650	{
1651	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1652	fIllegalInstr = true;
1653	}
1654
1655	#if 0
1656	/// @todo we can handle certain in/out and privileged instructions in the guest context
1657	if (pCpu->pCurInstr->fOpType & DISOPTYPE_PRIVILEGED && pCpu->pCurInstr->uOpcode != OP_STI)
1658	{
1659	Log(("Illegal instructions for function patch!!\n"));
1660	return VERR_PATCHING_REFUSED;
1661	}
1662	#endif
1663	}
1664
1665	pPatch->cbPatchBlockSize += pCpu->cbInstr;
1666
1667	/* Illegal instruction -> end of analysis phase for this code block */
1668	if (fIllegalInstr \|\| patmIsIllegalInstr(pPatch, pCurInstrGC))
1669	{
1670	return VINF_SUCCESS;
1671	}
1672
1673	// Check for exit points
1674	switch (pCpu->pCurInstr->uOpcode)
1675	{
1676	case OP_ILLUD2:
1677	//This appears to be some kind of kernel panic in Linux 2.4; no point to analyse more
1678	Log(("Illegal opcode (0xf 0xb) -> return here\n"));
1679	return VINF_SUCCESS;
1680
1681	case OP_IRET:
1682	case OP_SYSEXIT: /* will fault or emulated in GC */
1683	case OP_RETN:
1684	return VINF_SUCCESS;
1685
1686	#ifdef VBOX_WITH_SAFE_STR /** @todo remove DISOPTYPE_PRIVILEGED_NOTRAP from disasm table */
1687	case OP_STR:
1688	break;
1689	#endif
1690
1691	case OP_POPF:
1692	case OP_STI:
1693	return VWRN_CONTINUE_ANALYSIS;
1694	default:
1695	if (pCpu->pCurInstr->fOpType & (DISOPTYPE_PRIVILEGED_NOTRAP))
1696	{
1697	patmAddIllegalInstrRecord(pVM, pPatch, pCurInstrGC);
1698	return VINF_SUCCESS; /* exit point */
1699	}
1700	return VWRN_CONTINUE_ANALYSIS;
1701	}
1702
1703	return VWRN_CONTINUE_ANALYSIS;
1704	}
1705
1706	/**
1707	* Recompiles the instructions in a code block
1708	*
1709	* @returns VBox status code.
1710	* @param pVM The cross context VM structure.
1711	* @param pCpu CPU disassembly state
1712	* @param pInstrGC Guest context pointer to privileged instruction
1713	* @param pCurInstrGC Guest context pointer to the current instruction
1714	* @param pCacheRec Cache record ptr
1715	*
1716	*/
1717	static DECLCALLBACK(int) patmRecompileCallback(PVM pVM, DISCPUSTATE pCpu, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t *) pCurInstrGC, PPATMP2GLOOKUPREC pCacheRec)
1718	{
1719	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
1720	int rc = VINF_SUCCESS;
1721	bool fInhibitIRQInstr = false; /* did the instruction cause PATMFL_INHIBITIRQS to be set? */
1722
1723	LogFlow(("patmRecompileCallback %RRv %RRv\n", pInstrGC, pCurInstrGC));
1724
1725	if ( patmGuestGCPtrToPatchGCPtr(pVM, pPatch, pCurInstrGC) != 0
1726	&& !(pPatch->flags & PATMFL_RECOMPILE_NEXT)) /* do not do this when the next instruction must be executed! */
1727	{
1728	/*
1729	* Been there, done that; so insert a jump (we don't want to duplicate code)
1730	* no need to record this instruction as it's glue code that never crashes (it had better not!)
1731	*/
1732	Log(("patmRecompileCallback: jump to code we've recompiled before %RRv!\n", pCurInstrGC));
1733	return patmPatchGenRelJump(pVM, pPatch, pCurInstrGC, OP_JMP, !!(pCpu->fPrefix & DISPREFIX_OPSIZE));
1734	}
1735
1736	if (pPatch->flags & (PATMFL_DUPLICATE_FUNCTION))
1737	{
1738	rc = patmAnalyseFunctionCallback(pVM, pCpu, pInstrGC, pCurInstrGC, pCacheRec);
1739	}
1740	else
1741	rc = patmAnalyseBlockCallback(pVM, pCpu, pInstrGC, pCurInstrGC, pCacheRec);
1742
1743	if (RT_FAILURE(rc))
1744	return rc;
1745
1746	/* Note: Never do a direct return unless a failure is encountered! */
1747
1748	/* Clear recompilation of next instruction flag; we are doing that right here. */
1749	if (pPatch->flags & PATMFL_RECOMPILE_NEXT)
1750	pPatch->flags &= ~PATMFL_RECOMPILE_NEXT;
1751
1752	/* Add lookup record for patch to guest address translation */
1753	patmR3AddP2GLookupRecord(pVM, pPatch, PATCHCODE_PTR_HC(pPatch) + pPatch->uCurPatchOffset, pCurInstrGC, PATM_LOOKUP_BOTHDIR);
1754
1755	/* Update lowest and highest instruction address for this patch */
1756	if (pCurInstrGC < pPatch->pInstrGCLowest)
1757	pPatch->pInstrGCLowest = pCurInstrGC;
1758	else
1759	if (pCurInstrGC > pPatch->pInstrGCHighest)
1760	pPatch->pInstrGCHighest = pCurInstrGC + pCpu->cbInstr;
1761
1762	/* Illegal instruction -> end of recompile phase for this code block. */
1763	if (patmIsIllegalInstr(pPatch, pCurInstrGC))
1764	{
1765	Log(("Illegal instruction at %RRv -> mark with int 3\n", pCurInstrGC));
1766	rc = patmPatchGenIllegalInstr(pVM, pPatch);
1767	goto end;
1768	}
1769
1770	/* For our first attempt, we'll handle only simple relative jumps (immediate offset coded in instruction).
1771	* Indirect calls are handled below.
1772	*/
1773	if ( (pCpu->pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
1774	&& (pCpu->pCurInstr->uOpcode != OP_CALL \|\| (pPatch->flags & PATMFL_SUPPORT_CALLS))
1775	&& (OP_PARM_VTYPE(pCpu->pCurInstr->fParam1) == OP_PARM_J))
1776	{
1777	RCPTRTYPE(uint8_t *) pTargetGC = PATMResolveBranch(pCpu, pCurInstrGC);
1778	if (pTargetGC == 0)
1779	{
1780	Log(("We don't support far jumps here!! (%08X)\n", pCpu->Param1.fUse));
1781	return VERR_PATCHING_REFUSED;
1782	}
1783
1784	if (pCpu->pCurInstr->uOpcode == OP_CALL)
1785	{
1786	Assert(!PATMIsPatchGCAddr(pVM, pTargetGC));
1787	rc = patmPatchGenCall(pVM, pPatch, pCpu, pCurInstrGC, pTargetGC, false);
1788	if (RT_FAILURE(rc))
1789	goto end;
1790	}
1791	else
1792	rc = patmPatchGenRelJump(pVM, pPatch, pTargetGC, pCpu->pCurInstr->uOpcode, !!(pCpu->fPrefix & DISPREFIX_OPSIZE));
1793
1794	if (RT_SUCCESS(rc))
1795	rc = VWRN_CONTINUE_RECOMPILE;
1796
1797	goto end;
1798	}
1799
1800	switch (pCpu->pCurInstr->uOpcode)
1801	{
1802	case OP_CLI:
1803	{
1804	/* If a cli is found while duplicating instructions for another patch, then it's of vital importance to continue
1805	* until we've found the proper exit point(s).
1806	*/
1807	if ( pCurInstrGC != pInstrGC
1808	&& !(pPatch->flags & (PATMFL_DUPLICATE_FUNCTION))
1809	)
1810	{
1811	Log(("cli instruction found in other instruction patch block; force it to continue & find an exit point\n"));
1812	pPatch->flags &= ~(PATMFL_CHECK_SIZE \| PATMFL_SINGLE_INSTRUCTION);
1813	}
1814	/* Set by irq inhibition; no longer valid now. */
1815	pPatch->flags &= ~PATMFL_GENERATE_JUMPTOGUEST;
1816
1817	rc = patmPatchGenCli(pVM, pPatch);
1818	if (RT_SUCCESS(rc))
1819	rc = VWRN_CONTINUE_RECOMPILE;
1820	break;
1821	}
1822
1823	case OP_MOV:
1824	if (pCpu->pCurInstr->fOpType & DISOPTYPE_POTENTIALLY_DANGEROUS)
1825	{
1826	/* mov ss, src? */
1827	if ( (pCpu->Param1.fUse & DISUSE_REG_SEG)
1828	&& (pCpu->Param1.Base.idxSegReg == DISSELREG_SS))
1829	{
1830	Log(("Force recompilation of next instruction for OP_MOV at %RRv\n", pCurInstrGC));
1831	pPatch->flags \|= PATMFL_RECOMPILE_NEXT;
1832	/** @todo this could cause a fault (ring 0 selector being loaded in ring 1) */
1833	}
1834	#if 0 /* necessary for Haiku */
1835	else
1836	if ( (pCpu->Param2.fUse & DISUSE_REG_SEG)
1837	&& (pCpu->Param2.Base.idxSegReg == USE_REG_SS)
1838	&& (pCpu->Param1.fUse & (DISUSE_REG_GEN32\|DISUSE_REG_GEN16))) /** @todo memory operand must in theory be handled too */
1839	{
1840	/* mov GPR, ss */
1841	rc = patmPatchGenMovFromSS(pVM, pPatch, pCpu, pCurInstrGC);
1842	if (RT_SUCCESS(rc))
1843	rc = VWRN_CONTINUE_RECOMPILE;
1844	break;
1845	}
1846	#endif
1847	}
1848	goto duplicate_instr;
1849
1850	case OP_POP:
1851	/** @todo broken comparison!! should be if ((pCpu->Param1.fUse & DISUSE_REG_SEG) && (pCpu->Param1.Base.idxSegReg == DISSELREG_SS)) */
1852	if (pCpu->pCurInstr->fParam1 == OP_PARM_REG_SS)
1853	{
1854	Assert(pCpu->pCurInstr->fOpType & DISOPTYPE_INHIBIT_IRQS);
1855
1856	Log(("Force recompilation of next instruction for OP_MOV at %RRv\n", pCurInstrGC));
1857	pPatch->flags \|= PATMFL_RECOMPILE_NEXT;
1858	}
1859	goto duplicate_instr;
1860
1861	case OP_STI:
1862	{
1863	RTRCPTR pNextInstrGC = 0; /* by default no inhibit irq */
1864
1865	/* In a sequence of instructions that inhibit irqs, only the first one actually inhibits irqs. */
1866	if (!(pPatch->flags & PATMFL_INHIBIT_IRQS))
1867	{
1868	pPatch->flags \|= PATMFL_INHIBIT_IRQS \| PATMFL_GENERATE_JUMPTOGUEST;
1869	fInhibitIRQInstr = true;
1870	pNextInstrGC = pCurInstrGC + pCpu->cbInstr;
1871	Log(("Inhibit irqs for instruction OP_STI at %RRv\n", pCurInstrGC));
1872	}
1873	rc = patmPatchGenSti(pVM, pPatch, pCurInstrGC, pNextInstrGC);
1874
1875	if (RT_SUCCESS(rc))
1876	{
1877	DISCPUSTATE cpu = *pCpu;
1878	unsigned cbInstr;
1879	int disret;
1880	RCPTRTYPE(uint8_t *) pReturnInstrGC;
1881
1882	pPatch->flags \|= PATMFL_FOUND_PATCHEND;
1883
1884	pNextInstrGC = pCurInstrGC + pCpu->cbInstr;
1885	{ /* Force pNextInstrHC out of scope after using it */
1886	uint8_t *pNextInstrHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pNextInstrGC);
1887	if (pNextInstrHC == NULL)
1888	{
1889	AssertFailed();
1890	return VERR_PATCHING_REFUSED;
1891	}
1892
1893	// Disassemble the next instruction
1894	disret = patmR3DisInstr(pVM, pPatch, pNextInstrGC, pNextInstrHC, PATMREAD_ORGCODE, &cpu, &cbInstr);
1895	}
1896	if (disret == false)
1897	{
1898	AssertMsgFailed(("STI: Disassembly failed (probably page not present) -> return to caller\n"));
1899	return VERR_PATCHING_REFUSED;
1900	}
1901	pReturnInstrGC = pNextInstrGC + cbInstr;
1902
1903	if ( (pPatch->flags & (PATMFL_DUPLICATE_FUNCTION))
1904	\|\| pReturnInstrGC <= pInstrGC
1905	\|\| pReturnInstrGC - pInstrGC >= SIZEOF_NEARJUMP32
1906	)
1907	{
1908	/* Not an exit point for function duplication patches */
1909	if ( (pPatch->flags & PATMFL_DUPLICATE_FUNCTION)
1910	&& RT_SUCCESS(rc))
1911	{
1912	pPatch->flags &= ~PATMFL_GENERATE_JUMPTOGUEST; /* Don't generate a jump back */
1913	rc = VWRN_CONTINUE_RECOMPILE;
1914	}
1915	else
1916	rc = VINF_SUCCESS; //exit point
1917	}
1918	else {
1919	Log(("PATM: sti occurred too soon; refusing patch!\n"));
1920	rc = VERR_PATCHING_REFUSED; //not allowed!!
1921	}
1922	}
1923	break;
1924	}
1925
1926	case OP_POPF:
1927	{
1928	bool fGenerateJmpBack = (pCurInstrGC + pCpu->cbInstr - pInstrGC >= SIZEOF_NEARJUMP32);
1929
1930	/* Not an exit point for IDT handler or function replacement patches */
1931	/* Note: keep IOPL in mind when changing any of this!! (see comments in PATMA.asm, PATMPopf32Replacement) */
1932	if (pPatch->flags & (PATMFL_IDTHANDLER\|PATMFL_DUPLICATE_FUNCTION))
1933	fGenerateJmpBack = false;
1934
1935	rc = patmPatchGenPopf(pVM, pPatch, pCurInstrGC + pCpu->cbInstr, !!(pCpu->fPrefix & DISPREFIX_OPSIZE), fGenerateJmpBack);
1936	if (RT_SUCCESS(rc))
1937	{
1938	if (fGenerateJmpBack == false)
1939	{
1940	/* Not an exit point for IDT handler or function replacement patches */
1941	rc = VWRN_CONTINUE_RECOMPILE;
1942	}
1943	else
1944	{
1945	pPatch->flags \|= PATMFL_FOUND_PATCHEND;
1946	rc = VINF_SUCCESS; /* exit point! */
1947	}
1948	}
1949	break;
1950	}
1951
1952	case OP_PUSHF:
1953	rc = patmPatchGenPushf(pVM, pPatch, !!(pCpu->fPrefix & DISPREFIX_OPSIZE));
1954	if (RT_SUCCESS(rc))
1955	rc = VWRN_CONTINUE_RECOMPILE;
1956	break;
1957
1958	case OP_PUSH:
1959	/** @todo broken comparison!! should be if ((pCpu->Param1.fUse & DISUSE_REG_SEG) && (pCpu->Param1.Base.idxSegReg == DISSELREG_SS)) */
1960	if (pCpu->pCurInstr->fParam1 == OP_PARM_REG_CS)
1961	{
1962	rc = patmPatchGenPushCS(pVM, pPatch);
1963	if (RT_SUCCESS(rc))
1964	rc = VWRN_CONTINUE_RECOMPILE;
1965	break;
1966	}
1967	goto duplicate_instr;
1968
1969	case OP_IRET:
1970	Log(("IRET at %RRv\n", pCurInstrGC));
1971	rc = patmPatchGenIret(pVM, pPatch, pCurInstrGC, !!(pCpu->fPrefix & DISPREFIX_OPSIZE));
1972	if (RT_SUCCESS(rc))
1973	{
1974	pPatch->flags \|= PATMFL_FOUND_PATCHEND;
1975	rc = VINF_SUCCESS; /* exit point by definition */
1976	}
1977	break;
1978
1979	case OP_ILLUD2:
1980	/* This appears to be some kind of kernel panic in Linux 2.4; no point to continue */
1981	rc = patmPatchGenIllegalInstr(pVM, pPatch);
1982	if (RT_SUCCESS(rc))
1983	rc = VINF_SUCCESS; /* exit point by definition */
1984	Log(("Illegal opcode (0xf 0xb)\n"));
1985	break;
1986
1987	case OP_CPUID:
1988	rc = patmPatchGenCpuid(pVM, pPatch, pCurInstrGC);
1989	if (RT_SUCCESS(rc))
1990	rc = VWRN_CONTINUE_RECOMPILE;
1991	break;
1992
1993	case OP_STR:
1994	#ifdef VBOX_WITH_SAFE_STR /** @todo remove DISOPTYPE_PRIVILEGED_NOTRAP from disasm table and move OP_STR into ifndef */
1995	/* Now safe because our shadow TR entry is identical to the guest's. */
1996	goto duplicate_instr;
1997	#endif
1998	case OP_SLDT:
1999	rc = patmPatchGenSldtStr(pVM, pPatch, pCpu, pCurInstrGC);
2000	if (RT_SUCCESS(rc))
2001	rc = VWRN_CONTINUE_RECOMPILE;
2002	break;
2003
2004	case OP_SGDT:
2005	case OP_SIDT:
2006	rc = patmPatchGenSxDT(pVM, pPatch, pCpu, pCurInstrGC);
2007	if (RT_SUCCESS(rc))
2008	rc = VWRN_CONTINUE_RECOMPILE;
2009	break;
2010
2011	case OP_RETN:
2012	/* retn is an exit point for function patches */
2013	rc = patmPatchGenRet(pVM, pPatch, pCpu, pCurInstrGC);
2014	if (RT_SUCCESS(rc))
2015	rc = VINF_SUCCESS; /* exit point by definition */
2016	break;
2017
2018	case OP_SYSEXIT:
2019	/* Duplicate it, so it can be emulated in GC (or fault). */
2020	rc = patmPatchGenDuplicate(pVM, pPatch, pCpu, pCurInstrGC);
2021	if (RT_SUCCESS(rc))
2022	rc = VINF_SUCCESS; /* exit point by definition */
2023	break;
2024
2025	case OP_CALL:
2026	Assert(pPatch->flags & PATMFL_SUPPORT_INDIRECT_CALLS);
2027	/* In interrupt gate handlers it's possible to encounter jumps or calls when IF has been enabled again.
2028	* In that case we'll jump to the original instruction and continue from there. Otherwise an int 3 is executed.
2029	*/
2030	Assert(pCpu->Param1.cb == 4 \|\| pCpu->Param1.cb == 6);
2031	if (pPatch->flags & PATMFL_SUPPORT_INDIRECT_CALLS && pCpu->Param1.cb == 4 /* no far calls! */)
2032	{
2033	rc = patmPatchGenCall(pVM, pPatch, pCpu, pCurInstrGC, (RTRCPTR)0xDEADBEEF, true);
2034	if (RT_SUCCESS(rc))
2035	{
2036	rc = VWRN_CONTINUE_RECOMPILE;
2037	}
2038	break;
2039	}
2040	goto gen_illegal_instr;
2041
2042	case OP_JMP:
2043	Assert(pPatch->flags & PATMFL_SUPPORT_INDIRECT_CALLS);
2044	/* In interrupt gate handlers it's possible to encounter jumps or calls when IF has been enabled again.
2045	* In that case we'll jump to the original instruction and continue from there. Otherwise an int 3 is executed.
2046	*/
2047	Assert(pCpu->Param1.cb == 4 \|\| pCpu->Param1.cb == 6);
2048	if (pPatch->flags & PATMFL_SUPPORT_INDIRECT_CALLS && pCpu->Param1.cb == 4 /* no far jumps! */)
2049	{
2050	rc = patmPatchGenJump(pVM, pPatch, pCpu, pCurInstrGC);
2051	if (RT_SUCCESS(rc))
2052	rc = VINF_SUCCESS; /* end of branch */
2053	break;
2054	}
2055	goto gen_illegal_instr;
2056
2057	case OP_INT3:
2058	case OP_INT:
2059	case OP_INTO:
2060	goto gen_illegal_instr;
2061
2062	case OP_MOV_DR:
2063	/* Note: currently we let DRx writes cause a trap d; our trap handler will decide to interpret it or not. */
2064	if (pCpu->pCurInstr->fParam2 == OP_PARM_Dd)
2065	{
2066	rc = patmPatchGenMovDebug(pVM, pPatch, pCpu);
2067	if (RT_SUCCESS(rc))
2068	rc = VWRN_CONTINUE_RECOMPILE;
2069	break;
2070	}
2071	goto duplicate_instr;
2072
2073	case OP_MOV_CR:
2074	/* Note: currently we let CRx writes cause a trap d; our trap handler will decide to interpret it or not. */
2075	if (pCpu->pCurInstr->fParam2 == OP_PARM_Cd)
2076	{
2077	rc = patmPatchGenMovControl(pVM, pPatch, pCpu);
2078	if (RT_SUCCESS(rc))
2079	rc = VWRN_CONTINUE_RECOMPILE;
2080	break;
2081	}
2082	goto duplicate_instr;
2083
2084	default:
2085	if (pCpu->pCurInstr->fOpType & (DISOPTYPE_CONTROLFLOW \| DISOPTYPE_PRIVILEGED_NOTRAP))
2086	{
2087	gen_illegal_instr:
2088	rc = patmPatchGenIllegalInstr(pVM, pPatch);
2089	if (RT_SUCCESS(rc))
2090	rc = VINF_SUCCESS; /* exit point by definition */
2091	}
2092	else
2093	{
2094	duplicate_instr:
2095	Log(("patmPatchGenDuplicate\n"));
2096	rc = patmPatchGenDuplicate(pVM, pPatch, pCpu, pCurInstrGC);
2097	if (RT_SUCCESS(rc))
2098	rc = VWRN_CONTINUE_RECOMPILE;
2099	}
2100	break;
2101	}
2102
2103	end:
2104
2105	if ( !fInhibitIRQInstr
2106	&& (pPatch->flags & PATMFL_INHIBIT_IRQS))
2107	{
2108	int rc2;
2109	RTRCPTR pNextInstrGC = pCurInstrGC + pCpu->cbInstr;
2110
2111	pPatch->flags &= ~PATMFL_INHIBIT_IRQS;
2112	Log(("Clear inhibit IRQ flag at %RRv\n", pCurInstrGC));
2113	if (pPatch->flags & PATMFL_GENERATE_JUMPTOGUEST)
2114	{
2115	Log(("patmRecompileCallback: generate jump back to guest (%RRv) after fused instruction\n", pNextInstrGC));
2116
2117	rc2 = patmPatchGenJumpToGuest(pVM, pPatch, pNextInstrGC, true /* clear inhibit irq flag */);
2118	pPatch->flags &= ~PATMFL_GENERATE_JUMPTOGUEST;
2119	rc = VINF_SUCCESS; /* end of the line */
2120	}
2121	else
2122	{
2123	rc2 = patmPatchGenClearInhibitIRQ(pVM, pPatch, pNextInstrGC);
2124	}
2125	if (RT_FAILURE(rc2))
2126	rc = rc2;
2127	}
2128
2129	if (RT_SUCCESS(rc))
2130	{
2131	// If single instruction patch, we've copied enough instructions and the current instruction is not a relative jump
2132	if ( (pPatch->flags & PATMFL_CHECK_SIZE)
2133	&& pCurInstrGC + pCpu->cbInstr - pInstrGC >= SIZEOF_NEARJUMP32
2134	&& !(pCpu->pCurInstr->fOpType & DISOPTYPE_RELATIVE_CONTROLFLOW)
2135	&& !(pPatch->flags & PATMFL_RECOMPILE_NEXT) /* do not do this when the next instruction must be executed! */
2136	)
2137	{
2138	RTRCPTR pNextInstrGC = pCurInstrGC + pCpu->cbInstr;
2139
2140	// The end marker for this kind of patch is any instruction at a location outside our patch jump
2141	Log(("patmRecompileCallback: end found for single instruction patch at %RRv cbInstr %d\n", pNextInstrGC, pCpu->cbInstr));
2142
2143	rc = patmPatchGenJumpToGuest(pVM, pPatch, pNextInstrGC);
2144	AssertRC(rc);
2145	}
2146	}
2147	return rc;
2148	}
2149
2150
2151	#ifdef LOG_ENABLED
2152
2153	/**
2154	* Add a disasm jump record (temporary for prevent duplicate analysis)
2155	*
2156	* @param pVM The cross context VM structure.
2157	* @param pPatch Patch structure ptr
2158	* @param pInstrGC Guest context pointer to privileged instruction
2159	*
2160	*/
2161	static void patmPatchAddDisasmJump(PVM pVM, PPATCHINFO pPatch, RTRCPTR pInstrGC)
2162	{
2163	PAVLPVNODECORE pRec;
2164
2165	pRec = (PAVLPVNODECORE)MMR3HeapAllocZ(pVM, MM_TAG_PATM_PATCH, sizeof(*pRec));
2166	Assert(pRec);
2167	pRec->Key = (AVLPVKEY)(uintptr_t)pInstrGC;
2168
2169	int ret = RTAvlPVInsert(&pPatch->pTempInfo->DisasmJumpTree, pRec);
2170	Assert(ret);
2171	}
2172
2173	/**
2174	* Checks if jump target has been analysed before.
2175	*
2176	* @returns VBox status code.
2177	* @param pPatch Patch struct
2178	* @param pInstrGC Jump target
2179	*
2180	*/
2181	static bool patmIsKnownDisasmJump(PPATCHINFO pPatch, RTRCPTR pInstrGC)
2182	{
2183	PAVLPVNODECORE pRec;
2184
2185	pRec = RTAvlPVGet(&pPatch->pTempInfo->DisasmJumpTree, (AVLPVKEY)(uintptr_t)pInstrGC);
2186	if (pRec)
2187	return true;
2188	return false;
2189	}
2190
2191	/**
2192	* For proper disassembly of the final patch block
2193	*
2194	* @returns VBox status code.
2195	* @param pVM The cross context VM structure.
2196	* @param pCpu CPU disassembly state
2197	* @param pInstrGC Guest context pointer to privileged instruction
2198	* @param pCurInstrGC Guest context pointer to the current instruction
2199	* @param pCacheRec Cache record ptr
2200	*
2201	*/
2202	DECLCALLBACK(int) patmR3DisasmCallback(PVM pVM, DISCPUSTATE pCpu, RCPTRTYPE(uint8_t ) pInstrGC,
2203	RCPTRTYPE(uint8_t *) pCurInstrGC, PPATMP2GLOOKUPREC pCacheRec)
2204	{
2205	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
2206	NOREF(pInstrGC);
2207
2208	if (pCpu->pCurInstr->uOpcode == OP_INT3)
2209	{
2210	/* Could be an int3 inserted in a call patch. Check to be sure */
2211	DISCPUSTATE cpu;
2212	RTRCPTR pOrgJumpGC;
2213
2214	pOrgJumpGC = patmPatchGCPtr2GuestGCPtr(pVM, pPatch, pCurInstrGC);
2215
2216	{ /* Force pOrgJumpHC out of scope after using it */
2217	uint8_t *pOrgJumpHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pOrgJumpGC);
2218
2219	bool disret = patmR3DisInstr(pVM, pPatch, pOrgJumpGC, pOrgJumpHC, PATMREAD_ORGCODE, &cpu, NULL);
2220	if (!disret \|\| cpu.pCurInstr->uOpcode != OP_CALL \|\| cpu.Param1.cb != 4 /* only near calls */)
2221	return VINF_SUCCESS;
2222	}
2223	return VWRN_CONTINUE_ANALYSIS;
2224	}
2225
2226	if ( pCpu->pCurInstr->uOpcode == OP_ILLUD2
2227	&& PATMIsPatchGCAddr(pVM, pCurInstrGC))
2228	{
2229	/* the indirect call patch contains an 0xF/0xB illegal instr to call for assistance; check for this and continue */
2230	return VWRN_CONTINUE_ANALYSIS;
2231	}
2232
2233	if ( (pCpu->pCurInstr->uOpcode == OP_CALL && !(pPatch->flags & PATMFL_SUPPORT_CALLS))
2234	\|\| pCpu->pCurInstr->uOpcode == OP_INT
2235	\|\| pCpu->pCurInstr->uOpcode == OP_IRET
2236	\|\| pCpu->pCurInstr->uOpcode == OP_RETN
2237	\|\| pCpu->pCurInstr->uOpcode == OP_RETF
2238	)
2239	{
2240	return VINF_SUCCESS;
2241	}
2242
2243	if (pCpu->pCurInstr->uOpcode == OP_ILLUD2)
2244	return VINF_SUCCESS;
2245
2246	return VWRN_CONTINUE_ANALYSIS;
2247	}
2248
2249
2250	/**
2251	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
2252	*
2253	* @returns VBox status code.
2254	* @param pVM The cross context VM structure.
2255	* @param pInstrGC Guest context pointer to the initial privileged instruction
2256	* @param pCurInstrGC Guest context pointer to the current instruction
2257	* @param pfnPATMR3Disasm Callback for testing the disassembled instruction
2258	* @param pCacheRec Cache record ptr
2259	*
2260	*/
2261	int patmr3DisasmCode(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, PFN_PATMR3ANALYSE pfnPATMR3Disasm, PPATMP2GLOOKUPREC pCacheRec)
2262	{
2263	DISCPUSTATE cpu;
2264	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
2265	int rc = VWRN_CONTINUE_ANALYSIS;
2266	uint32_t cbInstr, delta;
2267	R3PTRTYPE(uint8_t *) pCurInstrHC = 0;
2268	bool disret;
2269	char szOutput[256];
2270
2271	Assert(pCurInstrHC != PATCHCODE_PTR_HC(pPatch) \|\| pPatch->pTempInfo->DisasmJumpTree == 0);
2272
2273	/* We need this to determine branch targets (and for disassembling). */
2274	delta = pVM->patm.s.pPatchMemGC - (uintptr_t)pVM->patm.s.pPatchMemHC;
2275
2276	while (rc == VWRN_CONTINUE_ANALYSIS)
2277	{
2278	pCurInstrHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
2279	if (pCurInstrHC == NULL)
2280	{
2281	rc = VERR_PATCHING_REFUSED;
2282	goto end;
2283	}
2284
2285	disret = patmR3DisInstrToStr(pVM, pPatch, pCurInstrGC, pCurInstrHC, PATMREAD_RAWCODE,
2286	&cpu, &cbInstr, szOutput, sizeof(szOutput));
2287	if (PATMIsPatchGCAddr(pVM, pCurInstrGC))
2288	{
2289	RTRCPTR pOrgInstrGC = patmPatchGCPtr2GuestGCPtr(pVM, pPatch, pCurInstrGC);
2290
2291	if (pOrgInstrGC != pPatch->pTempInfo->pLastDisasmInstrGC)
2292	Log(("DIS %RRv<-%s", pOrgInstrGC, szOutput));
2293	else
2294	Log(("DIS %s", szOutput));
2295
2296	pPatch->pTempInfo->pLastDisasmInstrGC = pOrgInstrGC;
2297	if (patmIsIllegalInstr(pPatch, pOrgInstrGC))
2298	{
2299	rc = VINF_SUCCESS;
2300	goto end;
2301	}
2302	}
2303	else
2304	Log(("DIS: %s", szOutput));
2305
2306	if (disret == false)
2307	{
2308	Log(("Disassembly failed (probably page not present) -> return to caller\n"));
2309	rc = VINF_SUCCESS;
2310	goto end;
2311	}
2312
2313	rc = pfnPATMR3Disasm(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec);
2314	if (rc != VWRN_CONTINUE_ANALYSIS) {
2315	break; //done!
2316	}
2317
2318	/* For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction) */
2319	if ( (cpu.pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
2320	&& (OP_PARM_VTYPE(cpu.pCurInstr->fParam1) == OP_PARM_J)
2321	&& cpu.pCurInstr->uOpcode != OP_CALL /* complete functions are replaced; don't bother here. */
2322	)
2323	{
2324	RTRCPTR pTargetGC = PATMResolveBranch(&cpu, pCurInstrGC);
2325	RTRCPTR pOrgTargetGC;
2326
2327	if (pTargetGC == 0)
2328	{
2329	Log(("We don't support far jumps here!! (%08X)\n", cpu.Param1.fUse));
2330	rc = VERR_PATCHING_REFUSED;
2331	break;
2332	}
2333
2334	if (!PATMIsPatchGCAddr(pVM, pTargetGC))
2335	{
2336	//jump back to guest code
2337	rc = VINF_SUCCESS;
2338	goto end;
2339	}
2340	pOrgTargetGC = PATMR3PatchToGCPtr(pVM, pTargetGC, 0);
2341
2342	if (patmIsCommonIDTHandlerPatch(pVM, pOrgTargetGC))
2343	{
2344	rc = VINF_SUCCESS;
2345	goto end;
2346	}
2347
2348	if (patmIsKnownDisasmJump(pPatch, pTargetGC) == false)
2349	{
2350	/* New jump, let's check it. */
2351	patmPatchAddDisasmJump(pVM, pPatch, pTargetGC);
2352
2353	if (cpu.pCurInstr->uOpcode == OP_CALL) pPatch->pTempInfo->nrCalls++;
2354	rc = patmr3DisasmCode(pVM, pInstrGC, pTargetGC, pfnPATMR3Disasm, pCacheRec);
2355	if (cpu.pCurInstr->uOpcode == OP_CALL) pPatch->pTempInfo->nrCalls--;
2356
2357	if (rc != VINF_SUCCESS) {
2358	break; //done!
2359	}
2360	}
2361	if (cpu.pCurInstr->uOpcode == OP_JMP)
2362	{
2363	/* Unconditional jump; return to caller. */
2364	rc = VINF_SUCCESS;
2365	goto end;
2366	}
2367
2368	rc = VWRN_CONTINUE_ANALYSIS;
2369	}
2370	pCurInstrGC += cbInstr;
2371	}
2372	end:
2373	return rc;
2374	}
2375
2376	/**
2377	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
2378	*
2379	* @returns VBox status code.
2380	* @param pVM The cross context VM structure.
2381	* @param pInstrGC Guest context pointer to the initial privileged instruction
2382	* @param pCurInstrGC Guest context pointer to the current instruction
2383	* @param pfnPATMR3Disasm Callback for testing the disassembled instruction
2384	* @param pCacheRec Cache record ptr
2385	*
2386	*/
2387	int patmr3DisasmCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, PFN_PATMR3ANALYSE pfnPATMR3Disasm, PPATMP2GLOOKUPREC pCacheRec)
2388	{
2389	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
2390
2391	int rc = patmr3DisasmCode(pVM, pInstrGC, pCurInstrGC, pfnPATMR3Disasm, pCacheRec);
2392	/* Free all disasm jump records. */
2393	patmEmptyTree(pVM, &pPatch->pTempInfo->DisasmJumpTree);
2394	return rc;
2395	}
2396
2397	#endif /* LOG_ENABLED */
2398
2399	/**
2400	* Detects it the specified address falls within a 5 byte jump generated for an active patch.
2401	* If so, this patch is permanently disabled.
2402	*
2403	* @param pVM The cross context VM structure.
2404	* @param pInstrGC Guest context pointer to instruction
2405	* @param pConflictGC Guest context pointer to check
2406	*
2407	* @note also checks for patch hints to make sure they can never be enabled if a conflict is present.
2408	*
2409	*/
2410	VMMR3_INT_DECL(int) PATMR3DetectConflict(PVM pVM, RTRCPTR pInstrGC, RTRCPTR pConflictGC)
2411	{
2412	AssertReturn(!HMIsEnabled(pVM), VERR_PATCH_NO_CONFLICT);
2413	PPATCHINFO pTargetPatch = patmFindActivePatchByEntrypoint(pVM, pConflictGC, true /* include patch hints */);
2414	if (pTargetPatch)
2415	return patmDisableUnusablePatch(pVM, pInstrGC, pConflictGC, pTargetPatch);
2416	return VERR_PATCH_NO_CONFLICT;
2417	}
2418
2419	/**
2420	* Recompile the code stream until the callback function detects a failure or decides everything is acceptable
2421	*
2422	* @returns VBox status code.
2423	* @param pVM The cross context VM structure.
2424	* @param pInstrGC Guest context pointer to privileged instruction
2425	* @param pCurInstrGC Guest context pointer to the current instruction
2426	* @param pfnPATMR3Recompile Callback for testing the disassembled instruction
2427	* @param pCacheRec Cache record ptr
2428	*
2429	*/
2430	static int patmRecompileCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, PFN_PATMR3ANALYSE pfnPATMR3Recompile, PPATMP2GLOOKUPREC pCacheRec)
2431	{
2432	DISCPUSTATE cpu;
2433	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
2434	int rc = VWRN_CONTINUE_ANALYSIS;
2435	uint32_t cbInstr;
2436	R3PTRTYPE(uint8_t *) pCurInstrHC = 0;
2437	bool disret;
2438	#ifdef LOG_ENABLED
2439	char szOutput[256];
2440	#endif
2441
2442	while (rc == VWRN_CONTINUE_RECOMPILE)
2443	{
2444	pCurInstrHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
2445	if (pCurInstrHC == NULL)
2446	{
2447	rc = VERR_PATCHING_REFUSED; /* fatal in this case */
2448	goto end;
2449	}
2450	#ifdef LOG_ENABLED
2451	disret = patmR3DisInstrToStr(pVM, pPatch, pCurInstrGC, pCurInstrHC, PATMREAD_ORGCODE,
2452	&cpu, &cbInstr, szOutput, sizeof(szOutput));
2453	Log(("Recompile: %s", szOutput));
2454	#else
2455	disret = patmR3DisInstr(pVM, pPatch, pCurInstrGC, pCurInstrHC, PATMREAD_ORGCODE, &cpu, &cbInstr);
2456	#endif
2457	if (disret == false)
2458	{
2459	Log(("Disassembly failed (probably page not present) -> return to caller\n"));
2460
2461	/* Add lookup record for patch to guest address translation */
2462	patmR3AddP2GLookupRecord(pVM, pPatch, PATCHCODE_PTR_HC(pPatch) + pPatch->uCurPatchOffset, pCurInstrGC, PATM_LOOKUP_BOTHDIR);
2463	patmPatchGenIllegalInstr(pVM, pPatch);
2464	rc = VINF_SUCCESS; /* Note: don't fail here; we might refuse an important patch!! */
2465	goto end;
2466	}
2467
2468	rc = pfnPATMR3Recompile(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec);
2469	if (rc != VWRN_CONTINUE_RECOMPILE)
2470	{
2471	/* If irqs are inhibited because of the current instruction, then we must make sure the next one is executed! */
2472	if ( rc == VINF_SUCCESS
2473	&& (pPatch->flags & PATMFL_INHIBIT_IRQS))
2474	{
2475	DISCPUSTATE cpunext;
2476	uint32_t opsizenext;
2477	uint8_t *pNextInstrHC;
2478	RTRCPTR pNextInstrGC = pCurInstrGC + cbInstr;
2479
2480	Log(("patmRecompileCodeStream: irqs inhibited by instruction %RRv\n", pNextInstrGC));
2481
2482	/* Certain instructions (e.g. sti) force the next instruction to be executed before any interrupts can occur.
2483	* Recompile the next instruction as well
2484	*/
2485	pNextInstrHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pNextInstrGC);
2486	if (pNextInstrHC == NULL)
2487	{
2488	rc = VERR_PATCHING_REFUSED; /* fatal in this case */
2489	goto end;
2490	}
2491	disret = patmR3DisInstr(pVM, pPatch, pNextInstrGC, pNextInstrHC, PATMREAD_ORGCODE, &cpunext, &opsizenext);
2492	if (disret == false)
2493	{
2494	rc = VERR_PATCHING_REFUSED; /* fatal in this case */
2495	goto end;
2496	}
2497	switch(cpunext.pCurInstr->uOpcode)
2498	{
2499	case OP_IRET: /* inhibit cleared in generated code */
2500	case OP_SYSEXIT: /* faults; inhibit should be cleared in HC handling */
2501	case OP_HLT:
2502	break; /* recompile these */
2503
2504	default:
2505	if (cpunext.pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
2506	{
2507	Log(("Unexpected control flow instruction after inhibit irq instruction\n"));
2508
2509	rc = patmPatchGenJumpToGuest(pVM, pPatch, pNextInstrGC, true /* clear inhibit irq flag */);
2510	AssertRC(rc);
2511	pPatch->flags &= ~PATMFL_INHIBIT_IRQS;
2512	goto end; /** @todo should be ok to ignore instruction fusing in this case */
2513	}
2514	break;
2515	}
2516
2517	/* Note: after a cli we must continue to a proper exit point */
2518	if (cpunext.pCurInstr->uOpcode != OP_CLI)
2519	{
2520	rc = pfnPATMR3Recompile(pVM, &cpunext, pInstrGC, pNextInstrGC, pCacheRec);
2521	if (RT_SUCCESS(rc))
2522	{
2523	rc = VINF_SUCCESS;
2524	goto end;
2525	}
2526	break;
2527	}
2528	else
2529	rc = VWRN_CONTINUE_RECOMPILE;
2530	}
2531	else
2532	break; /* done! */
2533	}
2534
2535	/** @todo continue with the instructions following the jump and then recompile the jump target code */
2536
2537
2538	/* For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction). */
2539	if ( (cpu.pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
2540	&& (OP_PARM_VTYPE(cpu.pCurInstr->fParam1) == OP_PARM_J)
2541	&& cpu.pCurInstr->uOpcode != OP_CALL /* complete functions are replaced; don't bother here. */
2542	)
2543	{
2544	RCPTRTYPE(uint8_t *) addr = PATMResolveBranch(&cpu, pCurInstrGC);
2545	if (addr == 0)
2546	{
2547	Log(("We don't support far jumps here!! (%08X)\n", cpu.Param1.fUse));
2548	rc = VERR_PATCHING_REFUSED;
2549	break;
2550	}
2551
2552	Log(("Jump encountered target %RRv\n", addr));
2553
2554	/* We don't check if the branch target lies in a valid page as we've already done that in the analysis phase. */
2555	if (!(cpu.pCurInstr->fOpType & DISOPTYPE_UNCOND_CONTROLFLOW))
2556	{
2557	Log(("patmRecompileCodeStream continue passed conditional jump\n"));
2558	/* First we need to finish this linear code stream until the next exit point. */
2559	rc = patmRecompileCodeStream(pVM, pInstrGC, pCurInstrGC+cbInstr, pfnPATMR3Recompile, pCacheRec);
2560	if (RT_FAILURE(rc))
2561	{
2562	Log(("patmRecompileCodeStream fatal error %d\n", rc));
2563	break; //fatal error
2564	}
2565	}
2566
2567	if (patmGuestGCPtrToPatchGCPtr(pVM, pPatch, addr) == 0)
2568	{
2569	/* New code; let's recompile it. */
2570	Log(("patmRecompileCodeStream continue with jump\n"));
2571
2572	/*
2573	* If we are jumping to an existing patch (or within 5 bytes of the entrypoint), then we must temporarily disable
2574	* this patch so we can continue our analysis
2575	*
2576	* We rely on CSAM to detect and resolve conflicts
2577	*/
2578	PPATCHINFO pTargetPatch = patmFindActivePatchByEntrypoint(pVM, addr);
2579	if(pTargetPatch)
2580	{
2581	Log(("Found active patch at target %RRv (%RRv) -> temporarily disabling it!!\n", addr, pTargetPatch->pPrivInstrGC));
2582	PATMR3DisablePatch(pVM, pTargetPatch->pPrivInstrGC);
2583	}
2584
2585	if (cpu.pCurInstr->uOpcode == OP_CALL) pPatch->pTempInfo->nrCalls++;
2586	rc = patmRecompileCodeStream(pVM, pInstrGC, addr, pfnPATMR3Recompile, pCacheRec);
2587	if (cpu.pCurInstr->uOpcode == OP_CALL) pPatch->pTempInfo->nrCalls--;
2588
2589	if(pTargetPatch)
2590	PATMR3EnablePatch(pVM, pTargetPatch->pPrivInstrGC);
2591
2592	if (RT_FAILURE(rc))
2593	{
2594	Log(("patmRecompileCodeStream fatal error %d\n", rc));
2595	break; //done!
2596	}
2597	}
2598	/* Always return to caller here; we're done! */
2599	rc = VINF_SUCCESS;
2600	goto end;
2601	}
2602	else
2603	if (cpu.pCurInstr->fOpType & DISOPTYPE_UNCOND_CONTROLFLOW)
2604	{
2605	rc = VINF_SUCCESS;
2606	goto end;
2607	}
2608	pCurInstrGC += cbInstr;
2609	}
2610	end:
2611	Assert(!(pPatch->flags & PATMFL_RECOMPILE_NEXT));
2612	return rc;
2613	}
2614
2615
2616	/**
2617	* Generate the jump from guest to patch code
2618	*
2619	* @returns VBox status code.
2620	* @param pVM The cross context VM structure.
2621	* @param pPatch Patch record
2622	* @param pCacheRec Guest translation lookup cache record
2623	* @param fAddFixup Whether to add a fixup record.
2624	*/
2625	static int patmGenJumpToPatch(PVM pVM, PPATCHINFO pPatch, PPATMP2GLOOKUPREC pCacheRec, bool fAddFixup = true)
2626	{
2627	uint8_t temp[8];
2628	uint8_t *pPB;
2629	int rc;
2630
2631	Assert(pPatch->cbPatchJump <= sizeof(temp));
2632	Assert(!(pPatch->flags & PATMFL_PATCHED_GUEST_CODE));
2633
2634	pPB = patmR3GCVirtToHCVirt(pVM, pCacheRec, pPatch->pPrivInstrGC);
2635	Assert(pPB);
2636
2637	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
2638	if (pPatch->flags & PATMFL_JUMP_CONFLICT)
2639	{
2640	Assert(pPatch->pPatchJumpDestGC);
2641
2642	if (pPatch->cbPatchJump == SIZEOF_NEARJUMP32)
2643	{
2644	// jmp [PatchCode]
2645	if (fAddFixup)
2646	{
2647	if (patmPatchAddReloc32(pVM, pPatch, &pPB[1], FIXUP_REL_JMPTOPATCH, pPatch->pPrivInstrGC + pPatch->cbPatchJump,
2648	pPatch->pPatchJumpDestGC) != VINF_SUCCESS)
2649	{
2650	Log(("Relocation failed for the jump in the guest code!!\n"));
2651	return VERR_PATCHING_REFUSED;
2652	}
2653	}
2654
2655	temp[0] = pPatch->aPrivInstr[0]; //jump opcode copied from original instruction
2656	(uint32_t )&temp[1] = (uint32_t)pPatch->pPatchJumpDestGC - ((uint32_t)pPatch->pPrivInstrGC + pPatch->cbPatchJump); //return address
2657	}
2658	else
2659	if (pPatch->cbPatchJump == SIZEOF_NEAR_COND_JUMP32)
2660	{
2661	// jmp [PatchCode]
2662	if (fAddFixup)
2663	{
2664	if (patmPatchAddReloc32(pVM, pPatch, &pPB[2], FIXUP_REL_JMPTOPATCH, pPatch->pPrivInstrGC + pPatch->cbPatchJump,
2665	pPatch->pPatchJumpDestGC) != VINF_SUCCESS)
2666	{
2667	Log(("Relocation failed for the jump in the guest code!!\n"));
2668	return VERR_PATCHING_REFUSED;
2669	}
2670	}
2671
2672	temp[0] = pPatch->aPrivInstr[0]; //jump opcode copied from original instruction
2673	temp[1] = pPatch->aPrivInstr[1]; //jump opcode copied from original instruction
2674	(uint32_t )&temp[2] = (uint32_t)pPatch->pPatchJumpDestGC - ((uint32_t)pPatch->pPrivInstrGC + pPatch->cbPatchJump); //return address
2675	}
2676	else
2677	{
2678	Assert(0);
2679	return VERR_PATCHING_REFUSED;
2680	}
2681	}
2682	else
2683	#endif
2684	{
2685	Assert(pPatch->cbPatchJump == SIZEOF_NEARJUMP32);
2686
2687	// jmp [PatchCode]
2688	if (fAddFixup)
2689	{
2690	if (patmPatchAddReloc32(pVM, pPatch, &pPB[1], FIXUP_REL_JMPTOPATCH, pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32,
2691	PATCHCODE_PTR_GC(pPatch)) != VINF_SUCCESS)
2692	{
2693	Log(("Relocation failed for the jump in the guest code!!\n"));
2694	return VERR_PATCHING_REFUSED;
2695	}
2696	}
2697	temp[0] = 0xE9; //jmp
2698	(uint32_t )&temp[1] = (RTRCUINTPTR)PATCHCODE_PTR_GC(pPatch) - ((RTRCUINTPTR)pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32); //return address
2699	}
2700	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pPatch->pPrivInstrGC, temp, pPatch->cbPatchJump);
2701	AssertRC(rc);
2702
2703	if (rc == VINF_SUCCESS)
2704	pPatch->flags \|= PATMFL_PATCHED_GUEST_CODE;
2705
2706	return rc;
2707	}
2708
2709	/**
2710	* Remove the jump from guest to patch code
2711	*
2712	* @returns VBox status code.
2713	* @param pVM The cross context VM structure.
2714	* @param pPatch Patch record
2715	*/
2716	static int patmRemoveJumpToPatch(PVM pVM, PPATCHINFO pPatch)
2717	{
2718	#ifdef DEBUG
2719	DISCPUSTATE cpu;
2720	char szOutput[256];
2721	uint32_t cbInstr, i = 0;
2722	bool disret;
2723
2724	while (i < pPatch->cbPrivInstr)
2725	{
2726	disret = patmR3DisInstrToStr(pVM, pPatch, pPatch->pPrivInstrGC + i, NULL, PATMREAD_ORGCODE,
2727	&cpu, &cbInstr, szOutput, sizeof(szOutput));
2728	if (disret == false)
2729	break;
2730
2731	Log(("Org patch jump: %s", szOutput));
2732	Assert(cbInstr);
2733	i += cbInstr;
2734	}
2735	#endif
2736
2737	/* Restore original code (privileged instruction + following instructions that were overwritten because of the 5/6 byte jmp). */
2738	int rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pPatch->pPrivInstrGC, pPatch->aPrivInstr, pPatch->cbPatchJump);
2739	#ifdef DEBUG
2740	if (rc == VINF_SUCCESS)
2741	{
2742	i = 0;
2743	while (i < pPatch->cbPrivInstr)
2744	{
2745	disret = patmR3DisInstrToStr(pVM, pPatch, pPatch->pPrivInstrGC + i, NULL, PATMREAD_ORGCODE,
2746	&cpu, &cbInstr, szOutput, sizeof(szOutput));
2747	if (disret == false)
2748	break;
2749
2750	Log(("Org instr: %s", szOutput));
2751	Assert(cbInstr);
2752	i += cbInstr;
2753	}
2754	}
2755	#endif
2756	pPatch->flags &= ~PATMFL_PATCHED_GUEST_CODE;
2757	return rc;
2758	}
2759
2760	/**
2761	* Generate the call from guest to patch code
2762	*
2763	* @returns VBox status code.
2764	* @param pVM The cross context VM structure.
2765	* @param pPatch Patch record
2766	* @param pTargetGC The target of the fixup (i.e. the patch code we're
2767	* calling into).
2768	* @param pCacheRec Guest translation cache record
2769	* @param fAddFixup Whether to add a fixup record.
2770	*/
2771	static int patmGenCallToPatch(PVM pVM, PPATCHINFO pPatch, RTRCPTR pTargetGC, PPATMP2GLOOKUPREC pCacheRec, bool fAddFixup = true)
2772	{
2773	uint8_t temp[8];
2774	uint8_t *pPB;
2775	int rc;
2776
2777	Assert(pPatch->cbPatchJump <= sizeof(temp));
2778
2779	pPB = patmR3GCVirtToHCVirt(pVM, pCacheRec, pPatch->pPrivInstrGC);
2780	Assert(pPB);
2781
2782	Assert(pPatch->cbPatchJump == SIZEOF_NEARJUMP32);
2783
2784	// jmp [PatchCode]
2785	if (fAddFixup)
2786	{
2787	if (patmPatchAddReloc32(pVM, pPatch, &pPB[1], FIXUP_REL_JMPTOPATCH,
2788	pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32, pTargetGC) != VINF_SUCCESS)
2789	{
2790	Log(("Relocation failed for the jump in the guest code!!\n"));
2791	return VERR_PATCHING_REFUSED;
2792	}
2793	}
2794
2795	Assert(pPatch->aPrivInstr[0] == 0xE8 \|\| pPatch->aPrivInstr[0] == 0xE9); /* call or jmp */
2796	temp[0] = pPatch->aPrivInstr[0];
2797	(uint32_t )&temp[1] = (uint32_t)pTargetGC - ((uint32_t)pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32); //return address
2798
2799	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pPatch->pPrivInstrGC, temp, pPatch->cbPatchJump);
2800	AssertRC(rc);
2801
2802	return rc;
2803	}
2804
2805
2806	/**
2807	* Patch cli/sti pushf/popf instruction block at specified location
2808	*
2809	* @returns VBox status code.
2810	* @param pVM The cross context VM structure.
2811	* @param pInstrGC Guest context point to privileged instruction
2812	* @param pInstrHC Host context point to privileged instruction
2813	* @param uOpcode Instruction opcode
2814	* @param uOpSize Size of starting instruction
2815	* @param pPatchRec Patch record
2816	*
2817	* @note returns failure if patching is not allowed or possible
2818	*
2819	*/
2820	static int patmR3PatchBlock(PVM pVM, RTRCPTR pInstrGC, R3PTRTYPE(uint8_t *) pInstrHC,
2821	uint32_t uOpcode, uint32_t uOpSize, PPATMPATCHREC pPatchRec)
2822	{
2823	PPATCHINFO pPatch = &pPatchRec->patch;
2824	int rc = VERR_PATCHING_REFUSED;
2825	uint32_t orgOffsetPatchMem = UINT32_MAX;
2826	RTRCPTR pInstrStart;
2827	bool fInserted;
2828	NOREF(pInstrHC); NOREF(uOpSize);
2829
2830	/* Save original offset (in case of failures later on) */
2831	/** @todo use the hypervisor heap (that has quite a few consequences for save/restore though) */
2832	orgOffsetPatchMem = pVM->patm.s.offPatchMem;
2833
2834	Assert(!(pPatch->flags & (PATMFL_GUEST_SPECIFIC\|PATMFL_USER_MODE\|PATMFL_TRAPHANDLER)));
2835	switch (uOpcode)
2836	{
2837	case OP_MOV:
2838	break;
2839
2840	case OP_CLI:
2841	case OP_PUSHF:
2842	/* We can 'call' a cli or pushf patch. It will either return to the original guest code when IF is set again, or fault. */
2843	/* Note: special precautions are taken when disabling and enabling such patches. */
2844	pPatch->flags \|= PATMFL_CALLABLE_AS_FUNCTION;
2845	break;
2846
2847	default:
2848	if (!(pPatch->flags & PATMFL_IDTHANDLER))
2849	{
2850	AssertMsg(0, ("patmR3PatchBlock: Invalid opcode %x\n", uOpcode));
2851	return VERR_INVALID_PARAMETER;
2852	}
2853	}
2854
2855	if (!(pPatch->flags & (PATMFL_IDTHANDLER\|PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT\|PATMFL_SYSENTER\|PATMFL_INT3_REPLACEMENT_BLOCK)))
2856	pPatch->flags \|= PATMFL_MUST_INSTALL_PATCHJMP;
2857
2858	/* If we're going to insert a patch jump, then the jump itself is not allowed to cross a page boundary. */
2859	if ( (pPatch->flags & PATMFL_MUST_INSTALL_PATCHJMP)
2860	&& PAGE_ADDRESS(pInstrGC) != PAGE_ADDRESS(pInstrGC + SIZEOF_NEARJUMP32)
2861	)
2862	{
2863	STAM_COUNTER_INC(&pVM->patm.s.StatPageBoundaryCrossed);
2864	Log(("Patch jump would cross page boundary -> refuse!!\n"));
2865	rc = VERR_PATCHING_REFUSED;
2866	goto failure;
2867	}
2868
2869	pPatch->nrPatch2GuestRecs = 0;
2870	pInstrStart = pInstrGC;
2871
2872	#ifdef PATM_ENABLE_CALL
2873	pPatch->flags \|= PATMFL_SUPPORT_CALLS \| PATMFL_SUPPORT_INDIRECT_CALLS;
2874	#endif
2875
2876	pPatch->pPatchBlockOffset = pVM->patm.s.offPatchMem;
2877	pPatch->uCurPatchOffset = 0;
2878
2879	if ((pPatch->flags & (PATMFL_IDTHANDLER\|PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT\|PATMFL_SYSENTER)) == PATMFL_IDTHANDLER)
2880	{
2881	Assert(pPatch->flags & PATMFL_INTHANDLER);
2882
2883	/* Install fake cli patch (to clear the virtual IF and check int xx parameters) */
2884	rc = patmPatchGenIntEntry(pVM, pPatch, pInstrGC);
2885	if (RT_FAILURE(rc))
2886	goto failure;
2887	}
2888
2889	/***************************************************************************************************************************/
2890	/* Note: We can't insert any code before a sysenter handler; some linux guests have an invalid stack at this point!!!!! */
2891	/***************************************************************************************************************************/
2892	#ifdef VBOX_WITH_STATISTICS
2893	if (!(pPatch->flags & PATMFL_SYSENTER))
2894	{
2895	rc = patmPatchGenStats(pVM, pPatch, pInstrGC);
2896	if (RT_FAILURE(rc))
2897	goto failure;
2898	}
2899	#endif
2900
2901	PATMP2GLOOKUPREC cacheRec;
2902	RT_ZERO(cacheRec);
2903	cacheRec.pPatch = pPatch;
2904
2905	rc = patmRecompileCodeStream(pVM, pInstrGC, pInstrGC, patmRecompileCallback, &cacheRec);
2906	/* Free leftover lock if any. */
2907	if (cacheRec.Lock.pvMap)
2908	{
2909	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
2910	cacheRec.Lock.pvMap = NULL;
2911	}
2912	if (rc != VINF_SUCCESS)
2913	{
2914	Log(("PATMR3PatchCli: patmRecompileCodeStream failed with %d\n", rc));
2915	goto failure;
2916	}
2917
2918	/* Calculated during analysis. */
2919	if (pPatch->cbPatchBlockSize < SIZEOF_NEARJUMP32)
2920	{
2921	/* Most likely cause: we encountered an illegal instruction very early on. */
2922	/** @todo could turn it into an int3 callable patch. */
2923	Log(("patmR3PatchBlock: patch block too small -> refuse\n"));
2924	rc = VERR_PATCHING_REFUSED;
2925	goto failure;
2926	}
2927
2928	/* size of patch block */
2929	pPatch->cbPatchBlockSize = pPatch->uCurPatchOffset;
2930
2931
2932	/* Update free pointer in patch memory. */
2933	pVM->patm.s.offPatchMem += pPatch->cbPatchBlockSize;
2934	/* Round to next 8 byte boundary. */
2935	pVM->patm.s.offPatchMem = RT_ALIGN_32(pVM->patm.s.offPatchMem, 8);
2936
2937	/*
2938	* Insert into patch to guest lookup tree
2939	*/
2940	LogFlow(("Insert %RRv patch offset %RRv\n", pPatchRec->patch.pPrivInstrGC, pPatch->pPatchBlockOffset));
2941	pPatchRec->CoreOffset.Key = pPatch->pPatchBlockOffset;
2942	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, &pPatchRec->CoreOffset);
2943	AssertMsg(fInserted, ("RTAvlULInsert failed for %x\n", pPatchRec->CoreOffset.Key));
2944	if (!fInserted)
2945	{
2946	rc = VERR_PATCHING_REFUSED;
2947	goto failure;
2948	}
2949
2950	/* Note that patmr3SetBranchTargets can install additional patches!! */
2951	rc = patmr3SetBranchTargets(pVM, pPatch);
2952	if (rc != VINF_SUCCESS)
2953	{
2954	Log(("PATMR3PatchCli: patmr3SetBranchTargets failed with %d\n", rc));
2955	goto failure;
2956	}
2957
2958	#ifdef LOG_ENABLED
2959	Log(("Patch code ----------------------------------------------------------\n"));
2960	patmr3DisasmCodeStream(pVM, PATCHCODE_PTR_GC(pPatch), PATCHCODE_PTR_GC(pPatch), patmR3DisasmCallback, &cacheRec);
2961	/* Free leftover lock if any. */
2962	if (cacheRec.Lock.pvMap)
2963	{
2964	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
2965	cacheRec.Lock.pvMap = NULL;
2966	}
2967	Log(("Patch code ends -----------------------------------------------------\n"));
2968	#endif
2969
2970	/* make a copy of the guest code bytes that will be overwritten */
2971	pPatch->cbPatchJump = SIZEOF_NEARJUMP32;
2972
2973	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), pPatch->aPrivInstr, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
2974	AssertRC(rc);
2975
2976	if (pPatch->flags & PATMFL_INT3_REPLACEMENT_BLOCK)
2977	{
2978	/uint8_t bASMInt3 = 0xCC; - unused /
2979
2980	Log(("patmR3PatchBlock %RRv -> int 3 callable patch.\n", pPatch->pPrivInstrGC));
2981	/* Replace first opcode byte with 'int 3'. */
2982	rc = patmActivateInt3Patch(pVM, pPatch);
2983	if (RT_FAILURE(rc))
2984	goto failure;
2985
2986	/* normal patch can be turned into an int3 patch -> clear patch jump installation flag. */
2987	pPatch->flags &= ~PATMFL_MUST_INSTALL_PATCHJMP;
2988
2989	pPatch->flags &= ~PATMFL_INSTR_HINT;
2990	STAM_COUNTER_INC(&pVM->patm.s.StatInt3Callable);
2991	}
2992	else
2993	if (pPatch->flags & PATMFL_MUST_INSTALL_PATCHJMP)
2994	{
2995	Assert(!(pPatch->flags & (PATMFL_IDTHANDLER\|PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT\|PATMFL_SYSENTER\|PATMFL_INT3_REPLACEMENT_BLOCK)));
2996	/* now insert a jump in the guest code */
2997	rc = patmGenJumpToPatch(pVM, pPatch, &cacheRec, true);
2998	AssertRC(rc);
2999	if (RT_FAILURE(rc))
3000	goto failure;
3001
3002	}
3003
3004	patmR3DbgAddPatch(pVM, pPatchRec);
3005
3006	PATM_LOG_RAW_PATCH_INSTR(pVM, pPatch, patmGetInstructionString(pPatch->opcode, pPatch->flags));
3007
3008	patmEmptyTree(pVM, &pPatch->pTempInfo->IllegalInstrTree);
3009	pPatch->pTempInfo->nrIllegalInstr = 0;
3010
3011	Log(("Successfully installed %s patch at %RRv\n", patmGetInstructionString(pPatch->opcode, pPatch->flags), pInstrGC));
3012
3013	pPatch->uState = PATCH_ENABLED;
3014	return VINF_SUCCESS;
3015
3016	failure:
3017	if (pPatchRec->CoreOffset.Key)
3018	RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, pPatchRec->CoreOffset.Key);
3019
3020	patmEmptyTree(pVM, &pPatch->FixupTree);
3021	pPatch->nrFixups = 0;
3022
3023	patmEmptyTree(pVM, &pPatch->JumpTree);
3024	pPatch->nrJumpRecs = 0;
3025
3026	patmEmptyTree(pVM, &pPatch->pTempInfo->IllegalInstrTree);
3027	pPatch->pTempInfo->nrIllegalInstr = 0;
3028
3029	/* Turn this cli patch into a dummy. */
3030	pPatch->uState = PATCH_REFUSED;
3031	pPatch->pPatchBlockOffset = 0;
3032
3033	// Give back the patch memory we no longer need
3034	Assert(orgOffsetPatchMem != (uint32_t)~0);
3035	pVM->patm.s.offPatchMem = orgOffsetPatchMem;
3036
3037	return rc;
3038	}
3039
3040	/**
3041	* Patch IDT handler
3042	*
3043	* @returns VBox status code.
3044	* @param pVM The cross context VM structure.
3045	* @param pInstrGC Guest context point to privileged instruction
3046	* @param uOpSize Size of starting instruction
3047	* @param pPatchRec Patch record
3048	* @param pCacheRec Cache record ptr
3049	*
3050	* @note returns failure if patching is not allowed or possible
3051	*
3052	*/
3053	static int patmIdtHandler(PVM pVM, RTRCPTR pInstrGC, uint32_t uOpSize, PPATMPATCHREC pPatchRec, PPATMP2GLOOKUPREC pCacheRec)
3054	{
3055	PPATCHINFO pPatch = &pPatchRec->patch;
3056	bool disret;
3057	DISCPUSTATE cpuPush, cpuJmp;
3058	uint32_t cbInstr;
3059	RTRCPTR pCurInstrGC = pInstrGC;
3060	uint8_t pCurInstrHC, pInstrHC;
3061	uint32_t orgOffsetPatchMem = UINT32_MAX;
3062
3063	pInstrHC = pCurInstrHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
3064	AssertReturn(pCurInstrHC, VERR_PAGE_NOT_PRESENT);
3065
3066	/*
3067	* In Linux it's often the case that many interrupt handlers push a predefined value onto the stack
3068	* and then jump to a common entrypoint. In order not to waste a lot of memory, we will check for this
3069	* condition here and only patch the common entypoint once.
3070	*/
3071	disret = patmR3DisInstr(pVM, pPatch, pCurInstrGC, pCurInstrHC, PATMREAD_ORGCODE, &cpuPush, &cbInstr);
3072	Assert(disret);
3073	if (disret && cpuPush.pCurInstr->uOpcode == OP_PUSH)
3074	{
3075	RTRCPTR pJmpInstrGC;
3076	int rc;
3077	pCurInstrGC += cbInstr;
3078
3079	disret = patmR3DisInstr(pVM, pPatch, pCurInstrGC, pCurInstrHC, PATMREAD_ORGCODE, &cpuJmp, &cbInstr);
3080	if ( disret
3081	&& cpuJmp.pCurInstr->uOpcode == OP_JMP
3082	&& (pJmpInstrGC = PATMResolveBranch(&cpuJmp, pCurInstrGC))
3083	)
3084	{
3085	bool fInserted;
3086	PPATMPATCHREC pJmpPatch = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pJmpInstrGC);
3087	if (pJmpPatch == 0)
3088	{
3089	/* Patch it first! */
3090	rc = PATMR3InstallPatch(pVM, pJmpInstrGC, pPatch->flags \| PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT);
3091	if (rc != VINF_SUCCESS)
3092	goto failure;
3093	pJmpPatch = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pJmpInstrGC);
3094	Assert(pJmpPatch);
3095	}
3096	if (pJmpPatch->patch.uState != PATCH_ENABLED)
3097	goto failure;
3098
3099	/* save original offset (in case of failures later on) */
3100	orgOffsetPatchMem = pVM->patm.s.offPatchMem;
3101
3102	pPatch->pPatchBlockOffset = pVM->patm.s.offPatchMem;
3103	pPatch->uCurPatchOffset = 0;
3104	pPatch->nrPatch2GuestRecs = 0;
3105
3106	#ifdef VBOX_WITH_STATISTICS
3107	rc = patmPatchGenStats(pVM, pPatch, pInstrGC);
3108	if (RT_FAILURE(rc))
3109	goto failure;
3110	#endif
3111
3112	/* Install fake cli patch (to clear the virtual IF) */
3113	rc = patmPatchGenIntEntry(pVM, pPatch, pInstrGC);
3114	if (RT_FAILURE(rc))
3115	goto failure;
3116
3117	/* Add lookup record for patch to guest address translation (for the push) */
3118	patmR3AddP2GLookupRecord(pVM, pPatch, PATCHCODE_PTR_HC(pPatch) + pPatch->uCurPatchOffset, pInstrGC, PATM_LOOKUP_BOTHDIR);
3119
3120	/* Duplicate push. */
3121	rc = patmPatchGenDuplicate(pVM, pPatch, &cpuPush, pInstrGC);
3122	if (RT_FAILURE(rc))
3123	goto failure;
3124
3125	/* Generate jump to common entrypoint. */
3126	rc = patmPatchGenPatchJump(pVM, pPatch, pCurInstrGC, PATCHCODE_PTR_GC(&pJmpPatch->patch));
3127	if (RT_FAILURE(rc))
3128	goto failure;
3129
3130	/* size of patch block */
3131	pPatch->cbPatchBlockSize = pPatch->uCurPatchOffset;
3132
3133	/* Update free pointer in patch memory. */
3134	pVM->patm.s.offPatchMem += pPatch->cbPatchBlockSize;
3135	/* Round to next 8 byte boundary */
3136	pVM->patm.s.offPatchMem = RT_ALIGN_32(pVM->patm.s.offPatchMem, 8);
3137
3138	/* There's no jump from guest to patch code. */
3139	pPatch->cbPatchJump = 0;
3140
3141
3142	#ifdef LOG_ENABLED
3143	Log(("Patch code ----------------------------------------------------------\n"));
3144	patmr3DisasmCodeStream(pVM, PATCHCODE_PTR_GC(pPatch), PATCHCODE_PTR_GC(pPatch), patmR3DisasmCallback, pCacheRec);
3145	Log(("Patch code ends -----------------------------------------------------\n"));
3146	#endif
3147	Log(("Successfully installed IDT handler patch at %RRv\n", pInstrGC));
3148
3149	/*
3150	* Insert into patch to guest lookup tree
3151	*/
3152	LogFlow(("Insert %RRv patch offset %RRv\n", pPatchRec->patch.pPrivInstrGC, pPatch->pPatchBlockOffset));
3153	pPatchRec->CoreOffset.Key = pPatch->pPatchBlockOffset;
3154	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, &pPatchRec->CoreOffset);
3155	AssertMsg(fInserted, ("RTAvlULInsert failed for %x\n", pPatchRec->CoreOffset.Key));
3156	patmR3DbgAddPatch(pVM, pPatchRec);
3157
3158	pPatch->uState = PATCH_ENABLED;
3159
3160	return VINF_SUCCESS;
3161	}
3162	}
3163	failure:
3164	/* Give back the patch memory we no longer need */
3165	if (orgOffsetPatchMem != (uint32_t)~0)
3166	pVM->patm.s.offPatchMem = orgOffsetPatchMem;
3167
3168	return patmR3PatchBlock(pVM, pInstrGC, pInstrHC, OP_CLI, uOpSize, pPatchRec);
3169	}
3170
3171	/**
3172	* Install a trampoline to call a guest trap handler directly
3173	*
3174	* @returns VBox status code.
3175	* @param pVM The cross context VM structure.
3176	* @param pInstrGC Guest context point to privileged instruction
3177	* @param pPatchRec Patch record
3178	* @param pCacheRec Cache record ptr
3179	*
3180	*/
3181	static int patmInstallTrapTrampoline(PVM pVM, RTRCPTR pInstrGC, PPATMPATCHREC pPatchRec, PPATMP2GLOOKUPREC pCacheRec)
3182	{
3183	PPATCHINFO pPatch = &pPatchRec->patch;
3184	int rc = VERR_PATCHING_REFUSED;
3185	uint32_t orgOffsetPatchMem = UINT32_MAX;
3186	bool fInserted;
3187
3188	// save original offset (in case of failures later on)
3189	orgOffsetPatchMem = pVM->patm.s.offPatchMem;
3190
3191	pPatch->pPatchBlockOffset = pVM->patm.s.offPatchMem;
3192	pPatch->uCurPatchOffset = 0;
3193	pPatch->nrPatch2GuestRecs = 0;
3194
3195	#ifdef VBOX_WITH_STATISTICS
3196	rc = patmPatchGenStats(pVM, pPatch, pInstrGC);
3197	if (RT_FAILURE(rc))
3198	goto failure;
3199	#endif
3200
3201	rc = patmPatchGenTrapEntry(pVM, pPatch, pInstrGC);
3202	if (RT_FAILURE(rc))
3203	goto failure;
3204
3205	/* size of patch block */
3206	pPatch->cbPatchBlockSize = pPatch->uCurPatchOffset;
3207
3208	/* Update free pointer in patch memory. */
3209	pVM->patm.s.offPatchMem += pPatch->cbPatchBlockSize;
3210	/* Round to next 8 byte boundary */
3211	pVM->patm.s.offPatchMem = RT_ALIGN_32(pVM->patm.s.offPatchMem, 8);
3212
3213	/* There's no jump from guest to patch code. */
3214	pPatch->cbPatchJump = 0;
3215
3216	#ifdef LOG_ENABLED
3217	Log(("Patch code ----------------------------------------------------------\n"));
3218	patmr3DisasmCodeStream(pVM, PATCHCODE_PTR_GC(pPatch), PATCHCODE_PTR_GC(pPatch), patmR3DisasmCallback, pCacheRec);
3219	Log(("Patch code ends -----------------------------------------------------\n"));
3220	#else
3221	RT_NOREF_PV(pCacheRec);
3222	#endif
3223	PATM_LOG_ORG_PATCH_INSTR(pVM, pPatch, "TRAP handler");
3224	Log(("Successfully installed Trap Trampoline patch at %RRv\n", pInstrGC));
3225
3226	/*
3227	* Insert into patch to guest lookup tree
3228	*/
3229	LogFlow(("Insert %RRv patch offset %RRv\n", pPatchRec->patch.pPrivInstrGC, pPatch->pPatchBlockOffset));
3230	pPatchRec->CoreOffset.Key = pPatch->pPatchBlockOffset;
3231	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, &pPatchRec->CoreOffset);
3232	AssertMsg(fInserted, ("RTAvlULInsert failed for %x\n", pPatchRec->CoreOffset.Key));
3233	patmR3DbgAddPatch(pVM, pPatchRec);
3234
3235	pPatch->uState = PATCH_ENABLED;
3236	return VINF_SUCCESS;
3237
3238	failure:
3239	AssertMsgFailed(("Failed to install trap handler trampoline!!\n"));
3240
3241	/* Turn this cli patch into a dummy. */
3242	pPatch->uState = PATCH_REFUSED;
3243	pPatch->pPatchBlockOffset = 0;
3244
3245	/* Give back the patch memory we no longer need */
3246	Assert(orgOffsetPatchMem != (uint32_t)~0);
3247	pVM->patm.s.offPatchMem = orgOffsetPatchMem;
3248
3249	return rc;
3250	}
3251
3252
3253	#ifdef LOG_ENABLED
3254	/**
3255	* Check if the instruction is patched as a common idt handler
3256	*
3257	* @returns true or false
3258	* @param pVM The cross context VM structure.
3259	* @param pInstrGC Guest context point to the instruction
3260	*
3261	*/
3262	static bool patmIsCommonIDTHandlerPatch(PVM pVM, RTRCPTR pInstrGC)
3263	{
3264	PPATMPATCHREC pRec;
3265
3266	pRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
3267	if (pRec && pRec->patch.flags & PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT)
3268	return true;
3269	return false;
3270	}
3271	#endif //DEBUG
3272
3273
3274	/**
3275	* Duplicates a complete function
3276	*
3277	* @returns VBox status code.
3278	* @param pVM The cross context VM structure.
3279	* @param pInstrGC Guest context point to privileged instruction
3280	* @param pPatchRec Patch record
3281	* @param pCacheRec Cache record ptr
3282	*
3283	*/
3284	static int patmDuplicateFunction(PVM pVM, RTRCPTR pInstrGC, PPATMPATCHREC pPatchRec, PPATMP2GLOOKUPREC pCacheRec)
3285	{
3286	PPATCHINFO pPatch = &pPatchRec->patch;
3287	int rc = VERR_PATCHING_REFUSED;
3288	uint32_t orgOffsetPatchMem = UINT32_MAX;
3289	bool fInserted;
3290
3291	Log(("patmDuplicateFunction %RRv\n", pInstrGC));
3292	/* Save original offset (in case of failures later on). */
3293	orgOffsetPatchMem = pVM->patm.s.offPatchMem;
3294
3295	/* We will not go on indefinitely with call instruction handling. */
3296	if (pVM->patm.s.ulCallDepth > PATM_MAX_CALL_DEPTH)
3297	{
3298	Log(("patmDuplicateFunction: maximum callback depth reached!!\n"));
3299	return VERR_PATCHING_REFUSED;
3300	}
3301
3302	pVM->patm.s.ulCallDepth++;
3303
3304	#ifdef PATM_ENABLE_CALL
3305	pPatch->flags \|= PATMFL_SUPPORT_CALLS \| PATMFL_SUPPORT_INDIRECT_CALLS;
3306	#endif
3307
3308	Assert(pPatch->flags & (PATMFL_DUPLICATE_FUNCTION));
3309
3310	pPatch->nrPatch2GuestRecs = 0;
3311	pPatch->pPatchBlockOffset = pVM->patm.s.offPatchMem;
3312	pPatch->uCurPatchOffset = 0;
3313
3314	/* Note: Set the PATM interrupt flag here; it was cleared before the patched call. (!!!) */
3315	rc = patmPatchGenSetPIF(pVM, pPatch, pInstrGC);
3316	if (RT_FAILURE(rc))
3317	goto failure;
3318
3319	#ifdef VBOX_WITH_STATISTICS
3320	rc = patmPatchGenStats(pVM, pPatch, pInstrGC);
3321	if (RT_FAILURE(rc))
3322	goto failure;
3323	#endif
3324
3325	rc = patmRecompileCodeStream(pVM, pInstrGC, pInstrGC, patmRecompileCallback, pCacheRec);
3326	if (rc != VINF_SUCCESS)
3327	{
3328	Log(("PATMR3PatchCli: patmRecompileCodeStream failed with %d\n", rc));
3329	goto failure;
3330	}
3331
3332	//size of patch block
3333	pPatch->cbPatchBlockSize = pPatch->uCurPatchOffset;
3334
3335	//update free pointer in patch memory
3336	pVM->patm.s.offPatchMem += pPatch->cbPatchBlockSize;
3337	/* Round to next 8 byte boundary. */
3338	pVM->patm.s.offPatchMem = RT_ALIGN_32(pVM->patm.s.offPatchMem, 8);
3339
3340	pPatch->uState = PATCH_ENABLED;
3341
3342	/*
3343	* Insert into patch to guest lookup tree
3344	*/
3345	LogFlow(("Insert %RRv patch offset %RRv\n", pPatchRec->patch.pPrivInstrGC, pPatch->pPatchBlockOffset));
3346	pPatchRec->CoreOffset.Key = pPatch->pPatchBlockOffset;
3347	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, &pPatchRec->CoreOffset);
3348	AssertMsg(fInserted, ("RTAvloU32Insert failed for %x\n", pPatchRec->CoreOffset.Key));
3349	if (!fInserted)
3350	{
3351	rc = VERR_PATCHING_REFUSED;
3352	goto failure;
3353	}
3354
3355	/* Note that patmr3SetBranchTargets can install additional patches!! */
3356	rc = patmr3SetBranchTargets(pVM, pPatch);
3357	if (rc != VINF_SUCCESS)
3358	{
3359	Log(("PATMR3PatchCli: patmr3SetBranchTargets failed with %d\n", rc));
3360	goto failure;
3361	}
3362
3363	patmR3DbgAddPatch(pVM, pPatchRec);
3364
3365	#ifdef LOG_ENABLED
3366	Log(("Patch code ----------------------------------------------------------\n"));
3367	patmr3DisasmCodeStream(pVM, PATCHCODE_PTR_GC(pPatch), PATCHCODE_PTR_GC(pPatch), patmR3DisasmCallback, pCacheRec);
3368	Log(("Patch code ends -----------------------------------------------------\n"));
3369	#endif
3370
3371	Log(("Successfully installed function duplication patch at %RRv\n", pInstrGC));
3372
3373	patmEmptyTree(pVM, &pPatch->pTempInfo->IllegalInstrTree);
3374	pPatch->pTempInfo->nrIllegalInstr = 0;
3375
3376	pVM->patm.s.ulCallDepth--;
3377	STAM_COUNTER_INC(&pVM->patm.s.StatInstalledFunctionPatches);
3378	return VINF_SUCCESS;
3379
3380	failure:
3381	if (pPatchRec->CoreOffset.Key)
3382	RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, pPatchRec->CoreOffset.Key);
3383
3384	patmEmptyTree(pVM, &pPatch->FixupTree);
3385	pPatch->nrFixups = 0;
3386
3387	patmEmptyTree(pVM, &pPatch->JumpTree);
3388	pPatch->nrJumpRecs = 0;
3389
3390	patmEmptyTree(pVM, &pPatch->pTempInfo->IllegalInstrTree);
3391	pPatch->pTempInfo->nrIllegalInstr = 0;
3392
3393	/* Turn this cli patch into a dummy. */
3394	pPatch->uState = PATCH_REFUSED;
3395	pPatch->pPatchBlockOffset = 0;
3396
3397	// Give back the patch memory we no longer need
3398	Assert(orgOffsetPatchMem != (uint32_t)~0);
3399	pVM->patm.s.offPatchMem = orgOffsetPatchMem;
3400
3401	pVM->patm.s.ulCallDepth--;
3402	Log(("patmDupicateFunction %RRv failed!!\n", pInstrGC));
3403	return rc;
3404	}
3405
3406	/**
3407	* Creates trampoline code to jump inside an existing patch
3408	*
3409	* @returns VBox status code.
3410	* @param pVM The cross context VM structure.
3411	* @param pInstrGC Guest context point to privileged instruction
3412	* @param pPatchRec Patch record
3413	*
3414	*/
3415	static int patmCreateTrampoline(PVM pVM, RTRCPTR pInstrGC, PPATMPATCHREC pPatchRec)
3416	{
3417	PPATCHINFO pPatch = &pPatchRec->patch;
3418	RTRCPTR pPage, pPatchTargetGC = 0;
3419	uint32_t orgOffsetPatchMem = UINT32_MAX;
3420	int rc = VERR_PATCHING_REFUSED;
3421	PPATCHINFO pPatchToJmp = NULL; /*< Patch the trampoline jumps to. /
3422	PTRAMPREC pTrampRec = NULL; /*< Trampoline record used to find the patch. /
3423	bool fInserted = false;
3424
3425	Log(("patmCreateTrampoline %RRv\n", pInstrGC));
3426	/* Save original offset (in case of failures later on). */
3427	orgOffsetPatchMem = pVM->patm.s.offPatchMem;
3428
3429	/* First we check if the duplicate function target lies in some existing function patch already. Will save some space. */
3430	/** @todo we already checked this before */
3431	pPage = pInstrGC & PAGE_BASE_GC_MASK;
3432
3433	PPATMPATCHPAGE pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, (RTRCPTR)pPage);
3434	if (pPatchPage)
3435	{
3436	uint32_t i;
3437
3438	for (i=0;i<pPatchPage->cCount;i++)
3439	{
3440	if (pPatchPage->papPatch[i])
3441	{
3442	pPatchToJmp = pPatchPage->papPatch[i];
3443
3444	if ( (pPatchToJmp->flags & PATMFL_DUPLICATE_FUNCTION)
3445	&& pPatchToJmp->uState == PATCH_ENABLED)
3446	{
3447	pPatchTargetGC = patmGuestGCPtrToPatchGCPtr(pVM, pPatchToJmp, pInstrGC);
3448	if (pPatchTargetGC)
3449	{
3450	uint32_t offsetPatch = pPatchTargetGC - pVM->patm.s.pPatchMemGC;
3451	PRECPATCHTOGUEST pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32GetBestFit(&pPatchToJmp->Patch2GuestAddrTree, offsetPatch, false);
3452	Assert(pPatchToGuestRec);
3453
3454	pPatchToGuestRec->fJumpTarget = true;
3455	Assert(pPatchTargetGC != pPatchToJmp->pPrivInstrGC);
3456	Log(("patmCreateTrampoline: generating jump to code inside patch at %RRv (patch target %RRv)\n", pPatchToJmp->pPrivInstrGC, pPatchTargetGC));
3457	break;
3458	}
3459	}
3460	}
3461	}
3462	}
3463	AssertReturn(pPatchPage && pPatchTargetGC && pPatchToJmp, VERR_PATCHING_REFUSED);
3464
3465	/*
3466	* Only record the trampoline patch if this is the first patch to the target
3467	* or we recorded other patches already.
3468	* The goal is to refuse refreshing function duplicates if the guest
3469	* modifies code after a saved state was loaded because it is not possible
3470	* to save the relation between trampoline and target without changing the
3471	* saved satte version.
3472	*/
3473	if ( !(pPatchToJmp->flags & PATMFL_EXTERNAL_JUMP_INSIDE)
3474	\|\| pPatchToJmp->pTrampolinePatchesHead)
3475	{
3476	pPatchToJmp->flags \|= PATMFL_EXTERNAL_JUMP_INSIDE;
3477	pTrampRec = (PTRAMPREC)MMR3HeapAllocZ(pVM, MM_TAG_PATM_PATCH, sizeof(*pTrampRec));
3478	if (!pTrampRec)
3479	return VERR_NO_MEMORY; /* or better return VERR_PATCHING_REFUSED to let the VM continue? */
3480
3481	pTrampRec->pPatchTrampoline = pPatchRec;
3482	}
3483
3484	pPatch->nrPatch2GuestRecs = 0;
3485	pPatch->pPatchBlockOffset = pVM->patm.s.offPatchMem;
3486	pPatch->uCurPatchOffset = 0;
3487
3488	/* Note: Set the PATM interrupt flag here; it was cleared before the patched call. (!!!) */
3489	rc = patmPatchGenSetPIF(pVM, pPatch, pInstrGC);
3490	if (RT_FAILURE(rc))
3491	goto failure;
3492
3493	#ifdef VBOX_WITH_STATISTICS
3494	rc = patmPatchGenStats(pVM, pPatch, pInstrGC);
3495	if (RT_FAILURE(rc))
3496	goto failure;
3497	#endif
3498
3499	rc = patmPatchGenPatchJump(pVM, pPatch, pInstrGC, pPatchTargetGC);
3500	if (RT_FAILURE(rc))
3501	goto failure;
3502
3503	/*
3504	* Insert into patch to guest lookup tree
3505	*/
3506	LogFlow(("Insert %RRv patch offset %RRv\n", pPatchRec->patch.pPrivInstrGC, pPatch->pPatchBlockOffset));
3507	pPatchRec->CoreOffset.Key = pPatch->pPatchBlockOffset;
3508	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, &pPatchRec->CoreOffset);
3509	AssertMsg(fInserted, ("RTAvloU32Insert failed for %x\n", pPatchRec->CoreOffset.Key));
3510	if (!fInserted)
3511	{
3512	rc = VERR_PATCHING_REFUSED;
3513	goto failure;
3514	}
3515	patmR3DbgAddPatch(pVM, pPatchRec);
3516
3517	/* size of patch block */
3518	pPatch->cbPatchBlockSize = pPatch->uCurPatchOffset;
3519
3520	/* Update free pointer in patch memory. */
3521	pVM->patm.s.offPatchMem += pPatch->cbPatchBlockSize;
3522	/* Round to next 8 byte boundary */
3523	pVM->patm.s.offPatchMem = RT_ALIGN_32(pVM->patm.s.offPatchMem, 8);
3524
3525	/* There's no jump from guest to patch code. */
3526	pPatch->cbPatchJump = 0;
3527
3528	/* Enable the patch. */
3529	pPatch->uState = PATCH_ENABLED;
3530	/* We allow this patch to be called as a function. */
3531	pPatch->flags \|= PATMFL_CALLABLE_AS_FUNCTION;
3532
3533	if (pTrampRec)
3534	{
3535	pTrampRec->pNext = pPatchToJmp->pTrampolinePatchesHead;
3536	pPatchToJmp->pTrampolinePatchesHead = pTrampRec;
3537	}
3538	STAM_COUNTER_INC(&pVM->patm.s.StatInstalledTrampoline);
3539	return VINF_SUCCESS;
3540
3541	failure:
3542	if (pPatchRec->CoreOffset.Key)
3543	RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, pPatchRec->CoreOffset.Key);
3544
3545	patmEmptyTree(pVM, &pPatch->FixupTree);
3546	pPatch->nrFixups = 0;
3547
3548	patmEmptyTree(pVM, &pPatch->JumpTree);
3549	pPatch->nrJumpRecs = 0;
3550
3551	patmEmptyTree(pVM, &pPatch->pTempInfo->IllegalInstrTree);
3552	pPatch->pTempInfo->nrIllegalInstr = 0;
3553
3554	/* Turn this cli patch into a dummy. */
3555	pPatch->uState = PATCH_REFUSED;
3556	pPatch->pPatchBlockOffset = 0;
3557
3558	// Give back the patch memory we no longer need
3559	Assert(orgOffsetPatchMem != (uint32_t)~0);
3560	pVM->patm.s.offPatchMem = orgOffsetPatchMem;
3561
3562	if (pTrampRec)
3563	MMR3HeapFree(pTrampRec);
3564
3565	return rc;
3566	}
3567
3568
3569	/**
3570	* Patch branch target function for call/jump at specified location.
3571	* (in responds to a VINF_PATM_DUPLICATE_FUNCTION GC exit reason)
3572	*
3573	* @returns VBox status code.
3574	* @param pVM The cross context VM structure.
3575	* @param pCtx Pointer to the guest CPU context.
3576	*
3577	*/
3578	VMMR3_INT_DECL(int) PATMR3DuplicateFunctionRequest(PVM pVM, PCPUMCTX pCtx)
3579	{
3580	RTRCPTR pBranchTarget, pPage;
3581	int rc;
3582	RTRCPTR pPatchTargetGC = 0;
3583	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
3584
3585	pBranchTarget = pCtx->edx;
3586	pBranchTarget = SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(pCtx), pBranchTarget);
3587
3588	/* First we check if the duplicate function target lies in some existing function patch already. Will save some space. */
3589	pPage = pBranchTarget & PAGE_BASE_GC_MASK;
3590
3591	PPATMPATCHPAGE pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, (RTRCPTR)pPage);
3592	if (pPatchPage)
3593	{
3594	uint32_t i;
3595
3596	for (i=0;i<pPatchPage->cCount;i++)
3597	{
3598	if (pPatchPage->papPatch[i])
3599	{
3600	PPATCHINFO pPatch = pPatchPage->papPatch[i];
3601
3602	if ( (pPatch->flags & PATMFL_DUPLICATE_FUNCTION)
3603	&& pPatch->uState == PATCH_ENABLED)
3604	{
3605	pPatchTargetGC = patmGuestGCPtrToPatchGCPtr(pVM, pPatch, pBranchTarget);
3606	if (pPatchTargetGC)
3607	{
3608	STAM_COUNTER_INC(&pVM->patm.s.StatDuplicateUseExisting);
3609	break;
3610	}
3611	}
3612	}
3613	}
3614	}
3615
3616	if (pPatchTargetGC)
3617	{
3618	/* Create a trampoline that also sets PATM_ASMFIX_INTERRUPTFLAG. */
3619	rc = PATMR3InstallPatch(pVM, pBranchTarget, PATMFL_CODE32 \| PATMFL_TRAMPOLINE);
3620	}
3621	else
3622	{
3623	rc = PATMR3InstallPatch(pVM, pBranchTarget, PATMFL_CODE32 \| PATMFL_DUPLICATE_FUNCTION);
3624	}
3625
3626	if (rc == VINF_SUCCESS)
3627	{
3628	pPatchTargetGC = PATMR3QueryPatchGCPtr(pVM, pBranchTarget);
3629	Assert(pPatchTargetGC);
3630	}
3631
3632	if (pPatchTargetGC)
3633	{
3634	pCtx->eax = pPatchTargetGC;
3635	pCtx->eax = pCtx->eax - (RTRCUINTPTR)pVM->patm.s.pPatchMemGC; /* make it relative */
3636	}
3637	else
3638	{
3639	/* We add a dummy entry into the lookup cache so we won't get bombarded with the same requests over and over again. */
3640	pCtx->eax = 0;
3641	STAM_COUNTER_INC(&pVM->patm.s.StatDuplicateREQFailed);
3642	}
3643	Assert(PATMIsPatchGCAddr(pVM, pCtx->edi));
3644	rc = patmAddBranchToLookupCache(pVM, pCtx->edi, pBranchTarget, pCtx->eax);
3645	AssertRC(rc);
3646
3647	pCtx->eip += PATM_ILLEGAL_INSTR_SIZE;
3648	STAM_COUNTER_INC(&pVM->patm.s.StatDuplicateREQSuccess);
3649	return VINF_SUCCESS;
3650	}
3651
3652	/**
3653	* Replaces a function call by a call to an existing function duplicate (or jmp -> jmp)
3654	*
3655	* @returns VBox status code.
3656	* @param pVM The cross context VM structure.
3657	* @param pCpu Disassembly CPU structure ptr
3658	* @param pInstrGC Guest context point to privileged instruction
3659	* @param pCacheRec Cache record ptr
3660	*
3661	*/
3662	static int patmReplaceFunctionCall(PVM pVM, DISCPUSTATE *pCpu, RTRCPTR pInstrGC, PPATMP2GLOOKUPREC pCacheRec)
3663	{
3664	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
3665	int rc = VERR_PATCHING_REFUSED;
3666	DISCPUSTATE cpu;
3667	RTRCPTR pTargetGC;
3668	PPATMPATCHREC pPatchFunction;
3669	uint32_t cbInstr;
3670	bool disret;
3671
3672	Assert(pPatch->flags & PATMFL_REPLACE_FUNCTION_CALL);
3673	Assert((pCpu->pCurInstr->uOpcode == OP_CALL \|\| pCpu->pCurInstr->uOpcode == OP_JMP) && pCpu->cbInstr == SIZEOF_NEARJUMP32);
3674
3675	if ((pCpu->pCurInstr->uOpcode != OP_CALL && pCpu->pCurInstr->uOpcode != OP_JMP) \|\| pCpu->cbInstr != SIZEOF_NEARJUMP32)
3676	{
3677	rc = VERR_PATCHING_REFUSED;
3678	goto failure;
3679	}
3680
3681	pTargetGC = PATMResolveBranch(pCpu, pInstrGC);
3682	if (pTargetGC == 0)
3683	{
3684	Log(("We don't support far jumps here!! (%08X)\n", pCpu->Param1.fUse));
3685	rc = VERR_PATCHING_REFUSED;
3686	goto failure;
3687	}
3688
3689	pPatchFunction = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pTargetGC);
3690	if (pPatchFunction == NULL)
3691	{
3692	for(;;)
3693	{
3694	/* It could be an indirect call (call -> jmp dest).
3695	* Note that it's dangerous to assume the jump will never change...
3696	*/
3697	uint8_t *pTmpInstrHC;
3698
3699	pTmpInstrHC = patmR3GCVirtToHCVirt(pVM, pCacheRec, pTargetGC);
3700	Assert(pTmpInstrHC);
3701	if (pTmpInstrHC == 0)
3702	break;
3703
3704	disret = patmR3DisInstr(pVM, pPatch, pTargetGC, pTmpInstrHC, PATMREAD_ORGCODE, &cpu, &cbInstr);
3705	if (disret == false \|\| cpu.pCurInstr->uOpcode != OP_JMP)
3706	break;
3707
3708	pTargetGC = PATMResolveBranch(&cpu, pTargetGC);
3709	if (pTargetGC == 0)
3710	{
3711	break;
3712	}
3713
3714	pPatchFunction = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pTargetGC);
3715	break;
3716	}
3717	if (pPatchFunction == 0)
3718	{
3719	AssertMsgFailed(("Unable to find duplicate function %RRv\n", pTargetGC));
3720	rc = VERR_PATCHING_REFUSED;
3721	goto failure;
3722	}
3723	}
3724
3725	// make a copy of the guest code bytes that will be overwritten
3726	pPatch->cbPatchJump = SIZEOF_NEARJUMP32;
3727
3728	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), pPatch->aPrivInstr, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
3729	AssertRC(rc);
3730
3731	/* Now replace the original call in the guest code */
3732	rc = patmGenCallToPatch(pVM, pPatch, PATCHCODE_PTR_GC(&pPatchFunction->patch), pCacheRec, true);
3733	AssertRC(rc);
3734	if (RT_FAILURE(rc))
3735	goto failure;
3736
3737	/* Lowest and highest address for write monitoring. */
3738	pPatch->pInstrGCLowest = pInstrGC;
3739	pPatch->pInstrGCHighest = pInstrGC + pCpu->cbInstr;
3740	PATM_LOG_ORG_PATCH_INSTR(pVM, pPatch, "Call");
3741
3742	Log(("Successfully installed function replacement patch at %RRv\n", pInstrGC));
3743
3744	pPatch->uState = PATCH_ENABLED;
3745	return VINF_SUCCESS;
3746
3747	failure:
3748	/* Turn this patch into a dummy. */
3749	pPatch->uState = PATCH_REFUSED;
3750
3751	return rc;
3752	}
3753
3754	/**
3755	* Replace the address in an MMIO instruction with the cached version.
3756	*
3757	* @returns VBox status code.
3758	* @param pVM The cross context VM structure.
3759	* @param pInstrGC Guest context point to privileged instruction
3760	* @param pCpu Disassembly CPU structure ptr
3761	* @param pCacheRec Cache record ptr
3762	*
3763	* @note returns failure if patching is not allowed or possible
3764	*
3765	*/
3766	static int patmPatchMMIOInstr(PVM pVM, RTRCPTR pInstrGC, DISCPUSTATE *pCpu, PPATMP2GLOOKUPREC pCacheRec)
3767	{
3768	PPATCHINFO pPatch = (PPATCHINFO)pCacheRec->pPatch;
3769	uint8_t *pPB;
3770	int rc = VERR_PATCHING_REFUSED;
3771
3772	Assert(pVM->patm.s.mmio.pCachedData);
3773	if (!pVM->patm.s.mmio.pCachedData)
3774	goto failure;
3775
3776	if (pCpu->Param2.fUse != DISUSE_DISPLACEMENT32)
3777	goto failure;
3778
3779	pPB = patmR3GCVirtToHCVirt(pVM, pCacheRec, pPatch->pPrivInstrGC);
3780	if (pPB == 0)
3781	goto failure;
3782
3783	/* Add relocation record for cached data access. */
3784	if (patmPatchAddReloc32(pVM, pPatch, &pPB[pCpu->cbInstr - sizeof(RTRCPTR)], FIXUP_ABSOLUTE, pPatch->pPrivInstrGC,
3785	pVM->patm.s.mmio.pCachedData) != VINF_SUCCESS)
3786	{
3787	Log(("Relocation failed for cached mmio address!!\n"));
3788	return VERR_PATCHING_REFUSED;
3789	}
3790	PATM_LOG_PATCH_INSTR(pVM, pPatch, PATMREAD_ORGCODE, "MMIO patch old instruction:", "");
3791
3792	/* Save original instruction. */
3793	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), pPatch->aPrivInstr, pPatch->pPrivInstrGC, pPatch->cbPrivInstr);
3794	AssertRC(rc);
3795
3796	pPatch->cbPatchJump = pPatch->cbPrivInstr; /* bit of a misnomer in this case; size of replacement instruction. */
3797
3798	/* Replace address with that of the cached item. */
3799	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pInstrGC + pCpu->cbInstr - sizeof(RTRCPTR),
3800	&pVM->patm.s.mmio.pCachedData, sizeof(RTRCPTR));
3801	AssertRC(rc);
3802	if (RT_FAILURE(rc))
3803	{
3804	goto failure;
3805	}
3806
3807	PATM_LOG_ORG_PATCH_INSTR(pVM, pPatch, "MMIO");
3808	pVM->patm.s.mmio.pCachedData = 0;
3809	pVM->patm.s.mmio.GCPhys = 0;
3810	pPatch->uState = PATCH_ENABLED;
3811	return VINF_SUCCESS;
3812
3813	failure:
3814	/* Turn this patch into a dummy. */
3815	pPatch->uState = PATCH_REFUSED;
3816
3817	return rc;
3818	}
3819
3820
3821	/**
3822	* Replace the address in an MMIO instruction with the cached version. (instruction is part of an existing patch)
3823	*
3824	* @returns VBox status code.
3825	* @param pVM The cross context VM structure.
3826	* @param pInstrGC Guest context point to privileged instruction
3827	* @param pPatch Patch record
3828	*
3829	* @note returns failure if patching is not allowed or possible
3830	*
3831	*/
3832	static int patmPatchPATMMMIOInstr(PVM pVM, RTRCPTR pInstrGC, PPATCHINFO pPatch)
3833	{
3834	DISCPUSTATE cpu;
3835	uint32_t cbInstr;
3836	bool disret;
3837	uint8_t *pInstrHC;
3838
3839	AssertReturn(pVM->patm.s.mmio.pCachedData, VERR_INVALID_PARAMETER);
3840
3841	/* Convert GC to HC address. */
3842	pInstrHC = patmPatchGCPtr2PatchHCPtr(pVM, pInstrGC);
3843	AssertReturn(pInstrHC, VERR_PATCHING_REFUSED);
3844
3845	/* Disassemble mmio instruction. */
3846	disret = patmR3DisInstrNoStrOpMode(pVM, pPatch, pInstrGC, pInstrHC, PATMREAD_ORGCODE,
3847	&cpu, &cbInstr);
3848	if (disret == false)
3849	{
3850	Log(("Disassembly failed (probably page not present) -> return to caller\n"));
3851	return VERR_PATCHING_REFUSED;
3852	}
3853
3854	AssertMsg(cbInstr <= MAX_INSTR_SIZE, ("privileged instruction too big %d!!\n", cbInstr));
3855	if (cbInstr > MAX_INSTR_SIZE)
3856	return VERR_PATCHING_REFUSED;
3857	if (cpu.Param2.fUse != DISUSE_DISPLACEMENT32)
3858	return VERR_PATCHING_REFUSED;
3859
3860	/* Add relocation record for cached data access. */
3861	if (patmPatchAddReloc32(pVM, pPatch, &pInstrHC[cpu.cbInstr - sizeof(RTRCPTR)], FIXUP_ABSOLUTE) != VINF_SUCCESS)
3862	{
3863	Log(("Relocation failed for cached mmio address!!\n"));
3864	return VERR_PATCHING_REFUSED;
3865	}
3866	/* Replace address with that of the cached item. */
3867	(RTRCPTR )&pInstrHC[cpu.cbInstr - sizeof(RTRCPTR)] = pVM->patm.s.mmio.pCachedData;
3868
3869	/* Lowest and highest address for write monitoring. */
3870	pPatch->pInstrGCLowest = pInstrGC;
3871	pPatch->pInstrGCHighest = pInstrGC + cpu.cbInstr;
3872
3873	PATM_LOG_ORG_PATCH_INSTR(pVM, pPatch, "MMIO");
3874	pVM->patm.s.mmio.pCachedData = 0;
3875	pVM->patm.s.mmio.GCPhys = 0;
3876	return VINF_SUCCESS;
3877	}
3878
3879	/**
3880	* Activates an int3 patch
3881	*
3882	* @returns VBox status code.
3883	* @param pVM The cross context VM structure.
3884	* @param pPatch Patch record
3885	*/
3886	static int patmActivateInt3Patch(PVM pVM, PPATCHINFO pPatch)
3887	{
3888	uint8_t bASMInt3 = 0xCC;
3889	int rc;
3890
3891	Assert(pPatch->flags & (PATMFL_INT3_REPLACEMENT\|PATMFL_INT3_REPLACEMENT_BLOCK));
3892	Assert(pPatch->uState != PATCH_ENABLED);
3893
3894	/* Replace first opcode byte with 'int 3'. */
3895	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pPatch->pPrivInstrGC, &bASMInt3, sizeof(bASMInt3));
3896	AssertRC(rc);
3897
3898	pPatch->cbPatchJump = sizeof(bASMInt3);
3899
3900	return rc;
3901	}
3902
3903	/**
3904	* Deactivates an int3 patch
3905	*
3906	* @returns VBox status code.
3907	* @param pVM The cross context VM structure.
3908	* @param pPatch Patch record
3909	*/
3910	static int patmDeactivateInt3Patch(PVM pVM, PPATCHINFO pPatch)
3911	{
3912	uint8_t cbASMInt3 = 1;
3913	int rc;
3914
3915	Assert(pPatch->flags & (PATMFL_INT3_REPLACEMENT\|PATMFL_INT3_REPLACEMENT_BLOCK));
3916	Assert(pPatch->uState == PATCH_ENABLED \|\| pPatch->uState == PATCH_DIRTY);
3917
3918	/* Restore first opcode byte. */
3919	rc = PGMPhysSimpleDirtyWriteGCPtr(VMMGetCpu0(pVM), pPatch->pPrivInstrGC, pPatch->aPrivInstr, cbASMInt3);
3920	AssertRC(rc);
3921	return rc;
3922	}
3923
3924	/**
3925	* Replace an instruction with a breakpoint (0xCC), that is handled dynamically
3926	* in the raw-mode context.
3927	*
3928	* @returns VBox status code.
3929	* @param pVM The cross context VM structure.
3930	* @param pInstrGC Guest context point to privileged instruction
3931	* @param pInstrHC Host context point to privileged instruction
3932	* @param pCpu Disassembly CPU structure ptr
3933	* @param pPatch Patch record
3934	*
3935	* @note returns failure if patching is not allowed or possible
3936	*
3937	*/
3938	int patmR3PatchInstrInt3(PVM pVM, RTRCPTR pInstrGC, R3PTRTYPE(uint8_t ) pInstrHC, DISCPUSTATE pCpu, PPATCHINFO pPatch)
3939	{
3940	uint8_t cbASMInt3 = 1;
3941	int rc;
3942	RT_NOREF_PV(pInstrHC);
3943
3944	/* Note: Do not use patch memory here! It might called during patch installation too. */
3945	PATM_LOG_PATCH_INSTR(pVM, pPatch, PATMREAD_ORGCODE, "patmR3PatchInstrInt3:", "");
3946
3947	/* Save the original instruction. */
3948	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), pPatch->aPrivInstr, pPatch->pPrivInstrGC, pPatch->cbPrivInstr);
3949	AssertRC(rc);
3950	pPatch->cbPatchJump = cbASMInt3; /* bit of a misnomer in this case; size of replacement instruction. */
3951
3952	pPatch->flags \|= PATMFL_INT3_REPLACEMENT;
3953
3954	/* Replace first opcode byte with 'int 3'. */
3955	rc = patmActivateInt3Patch(pVM, pPatch);
3956	if (RT_FAILURE(rc))
3957	goto failure;
3958
3959	/* Lowest and highest address for write monitoring. */
3960	pPatch->pInstrGCLowest = pInstrGC;
3961	pPatch->pInstrGCHighest = pInstrGC + pCpu->cbInstr;
3962
3963	pPatch->uState = PATCH_ENABLED;
3964	return VINF_SUCCESS;
3965
3966	failure:
3967	/* Turn this patch into a dummy. */
3968	return VERR_PATCHING_REFUSED;
3969	}
3970
3971	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
3972	/**
3973	* Patch a jump instruction at specified location
3974	*
3975	* @returns VBox status code.
3976	* @param pVM The cross context VM structure.
3977	* @param pInstrGC Guest context point to privileged instruction
3978	* @param pInstrHC Host context point to privileged instruction
3979	* @param pCpu Disassembly CPU structure ptr
3980	* @param pPatchRec Patch record
3981	*
3982	* @note returns failure if patching is not allowed or possible
3983	*
3984	*/
3985	int patmPatchJump(PVM pVM, RTRCPTR pInstrGC, R3PTRTYPE(uint8_t ) pInstrHC, DISCPUSTATE pCpu, PPATMPATCHREC pPatchRec)
3986	{
3987	PPATCHINFO pPatch = &pPatchRec->patch;
3988	int rc = VERR_PATCHING_REFUSED;
3989
3990	pPatch->pPatchBlockOffset = 0; /* doesn't use patch memory */
3991	pPatch->uCurPatchOffset = 0;
3992	pPatch->cbPatchBlockSize = 0;
3993	pPatch->flags \|= PATMFL_SINGLE_INSTRUCTION;
3994
3995	/*
3996	* Instruction replacements such as these should never be interrupted. I've added code to EM.cpp to
3997	* make sure this never happens. (unless a trap is triggered (intentionally or not))
3998	*/
3999	switch (pCpu->pCurInstr->uOpcode)
4000	{
4001	case OP_JO:
4002	case OP_JNO:
4003	case OP_JC:
4004	case OP_JNC:
4005	case OP_JE:
4006	case OP_JNE:
4007	case OP_JBE:
4008	case OP_JNBE:
4009	case OP_JS:
4010	case OP_JNS:
4011	case OP_JP:
4012	case OP_JNP:
4013	case OP_JL:
4014	case OP_JNL:
4015	case OP_JLE:
4016	case OP_JNLE:
4017	case OP_JMP:
4018	Assert(pPatch->flags & PATMFL_JUMP_CONFLICT);
4019	Assert(pCpu->Param1.fUse & DISUSE_IMMEDIATE32_REL);
4020	if (!(pCpu->Param1.fUse & DISUSE_IMMEDIATE32_REL))
4021	goto failure;
4022
4023	Assert(pCpu->cbInstr == SIZEOF_NEARJUMP32 \|\| pCpu->cbInstr == SIZEOF_NEAR_COND_JUMP32);
4024	if (pCpu->cbInstr != SIZEOF_NEARJUMP32 && pCpu->cbInstr != SIZEOF_NEAR_COND_JUMP32)
4025	goto failure;
4026
4027	if (PAGE_ADDRESS(pInstrGC) != PAGE_ADDRESS(pInstrGC + pCpu->cbInstr))
4028	{
4029	STAM_COUNTER_INC(&pVM->patm.s.StatPageBoundaryCrossed);
4030	AssertMsgFailed(("Patch jump would cross page boundary -> refuse!!\n"));
4031	rc = VERR_PATCHING_REFUSED;
4032	goto failure;
4033	}
4034
4035	break;
4036
4037	default:
4038	goto failure;
4039	}
4040
4041	// make a copy of the guest code bytes that will be overwritten
4042	Assert(pCpu->cbInstr <= sizeof(pPatch->aPrivInstr));
4043	Assert(pCpu->cbInstr >= SIZEOF_NEARJUMP32);
4044	pPatch->cbPatchJump = pCpu->cbInstr;
4045
4046	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), pPatch->aPrivInstr, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
4047	AssertRC(rc);
4048
4049	/* Now insert a jump in the guest code. */
4050	/*
4051	* A conflict jump patch needs to be treated differently; we'll just replace the relative jump address with one that
4052	* references the target instruction in the conflict patch.
4053	*/
4054	RTRCPTR pJmpDest = patmR3GuestGCPtrToPatchGCPtrSimple(pVM, pInstrGC + pCpu->cbInstr + (int32_t)pCpu->Param1.uValue);
4055
4056	AssertMsg(pJmpDest, ("patmR3GuestGCPtrToPatchGCPtrSimple failed for %RRv\n", pInstrGC + pCpu->cbInstr + (int32_t)pCpu->Param1.uValue));
4057	pPatch->pPatchJumpDestGC = pJmpDest;
4058
4059	PATMP2GLOOKUPREC cacheRec;
4060	RT_ZERO(cacheRec);
4061	cacheRec.pPatch = pPatch;
4062
4063	rc = patmGenJumpToPatch(pVM, pPatch, &cacherec, true);
4064	/* Free leftover lock if any. */
4065	if (cacheRec.Lock.pvMap)
4066	{
4067	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
4068	cacheRec.Lock.pvMap = NULL;
4069	}
4070	AssertRC(rc);
4071	if (RT_FAILURE(rc))
4072	goto failure;
4073
4074	pPatch->flags \|= PATMFL_MUST_INSTALL_PATCHJMP;
4075
4076	PATM_LOG_ORG_PATCH_INSTR(pVM, pPatch, patmGetInstructionString(pPatch->opcode, pPatch->flags));
4077	Log(("Successfully installed %s patch at %RRv\n", patmGetInstructionString(pPatch->opcode, pPatch->flags), pInstrGC));
4078
4079	STAM_COUNTER_INC(&pVM->patm.s.StatInstalledJump);
4080
4081	/* Lowest and highest address for write monitoring. */
4082	pPatch->pInstrGCLowest = pInstrGC;
4083	pPatch->pInstrGCHighest = pInstrGC + pPatch->cbPatchJump;
4084
4085	pPatch->uState = PATCH_ENABLED;
4086	return VINF_SUCCESS;
4087
4088	failure:
4089	/* Turn this cli patch into a dummy. */
4090	pPatch->uState = PATCH_REFUSED;
4091
4092	return rc;
4093	}
4094	#endif /* PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES */
4095
4096
4097	/**
4098	* Gives hint to PATM about supervisor guest instructions
4099	*
4100	* @returns VBox status code.
4101	* @param pVM The cross context VM structure.
4102	* @param pInstrGC Guest context point to privileged instruction
4103	* @param flags Patch flags
4104	*/
4105	VMMR3_INT_DECL(int) PATMR3AddHint(PVM pVM, RTRCPTR pInstrGC, uint32_t flags)
4106	{
4107	Assert(pInstrGC);
4108	Assert(flags == PATMFL_CODE32); RT_NOREF_PV(flags);
4109
4110	Log(("PATMR3AddHint %RRv\n", pInstrGC));
4111	return PATMR3InstallPatch(pVM, pInstrGC, PATMFL_CODE32 \| PATMFL_INSTR_HINT);
4112	}
4113
4114	/**
4115	* Patch privileged instruction at specified location
4116	*
4117	* @returns VBox status code.
4118	* @param pVM The cross context VM structure.
4119	* @param pInstrGC Guest context point to privileged instruction (0:32 flat
4120	* address)
4121	* @param flags Patch flags
4122	*
4123	* @note returns failure if patching is not allowed or possible
4124	*/
4125	VMMR3_INT_DECL(int) PATMR3InstallPatch(PVM pVM, RTRCPTR pInstrGC, uint64_t flags)
4126	{
4127	DISCPUSTATE cpu;
4128	R3PTRTYPE(uint8_t *) pInstrHC;
4129	uint32_t cbInstr;
4130	PPATMPATCHREC pPatchRec;
4131	PCPUMCTX pCtx = 0;
4132	bool disret;
4133	int rc;
4134	PVMCPU pVCpu = VMMGetCpu0(pVM);
4135	LogFlow(("PATMR3InstallPatch: %08x (%#llx)\n", pInstrGC, flags));
4136
4137	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
4138
4139	if ( !pVM
4140	\|\| pInstrGC == 0
4141	\|\| (flags & ~(PATMFL_CODE32\|PATMFL_IDTHANDLER\|PATMFL_INTHANDLER\|PATMFL_SYSENTER\|PATMFL_TRAPHANDLER\|PATMFL_DUPLICATE_FUNCTION\|PATMFL_REPLACE_FUNCTION_CALL\|PATMFL_GUEST_SPECIFIC\|PATMFL_INT3_REPLACEMENT\|PATMFL_TRAPHANDLER_WITH_ERRORCODE\|PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT\|PATMFL_MMIO_ACCESS\|PATMFL_TRAMPOLINE\|PATMFL_INSTR_HINT\|PATMFL_JUMP_CONFLICT)))
4142	{
4143	AssertFailed();
4144	return VERR_INVALID_PARAMETER;
4145	}
4146
4147	if (PATMIsEnabled(pVM) == false)
4148	return VERR_PATCHING_REFUSED;
4149
4150	/* Test for patch conflict only with patches that actually change guest code. */
4151	if (!(flags & (PATMFL_GUEST_SPECIFIC\|PATMFL_IDTHANDLER\|PATMFL_INTHANDLER\|PATMFL_TRAMPOLINE)))
4152	{
4153	PPATCHINFO pConflictPatch = patmFindActivePatchByEntrypoint(pVM, pInstrGC);
4154	AssertReleaseMsg(pConflictPatch == 0, ("Unable to patch overwritten instruction at %RRv (%RRv)\n", pInstrGC, pConflictPatch->pPrivInstrGC));
4155	if (pConflictPatch != 0)
4156	return VERR_PATCHING_REFUSED;
4157	}
4158
4159	if (!(flags & PATMFL_CODE32))
4160	{
4161	/** @todo Only 32 bits code right now */
4162	AssertMsgFailed(("PATMR3InstallPatch: We don't support 16 bits code at this moment!!\n"));
4163	return VERR_NOT_IMPLEMENTED;
4164	}
4165
4166	/* We ran out of patch memory; don't bother anymore. */
4167	if (pVM->patm.s.fOutOfMemory == true)
4168	return VERR_PATCHING_REFUSED;
4169
4170	#if 1 /* DONT COMMIT ENABLED! */
4171	/* Blacklisted NT4SP1 areas - debugging why we sometimes crash early on, */
4172	if ( 0
4173	//\|\| (pInstrGC - 0x80010000U) < 0x10000U // NT4SP1 HAL
4174	//\|\| (pInstrGC - 0x80010000U) < 0x5000U // NT4SP1 HAL
4175	//\|\| (pInstrGC - 0x80013000U) < 0x2000U // NT4SP1 HAL
4176	//\|\| (pInstrGC - 0x80014000U) < 0x1000U // NT4SP1 HAL
4177	//\|\| (pInstrGC - 0x80014000U) < 0x800U // NT4SP1 HAL
4178	//\|\| (pInstrGC - 0x80014400U) < 0x400U // NT4SP1 HAL
4179	//\|\| (pInstrGC - 0x80014400U) < 0x200U // NT4SP1 HAL
4180	//\|\| (pInstrGC - 0x80014400U) < 0x100U // NT4SP1 HAL
4181	//\|\| (pInstrGC - 0x80014500U) < 0x100U // NT4SP1 HAL - negative
4182	//\|\| (pInstrGC - 0x80014400U) < 0x80U // NT4SP1 HAL
4183	//\|\| (pInstrGC - 0x80014400U) < 0x80U // NT4SP1 HAL
4184	//\|\| (pInstrGC - 0x80014440U) < 0x40U // NT4SP1 HAL
4185	//\|\| (pInstrGC - 0x80014440U) < 0x20U // NT4SP1 HAL
4186	\|\| pInstrGC == 0x80014447 /* KfLowerIrql */
4187	\|\| 0)
4188	{
4189	Log(("PATMR3InstallPatch: %08x is blacklisted\n", pInstrGC));
4190	return VERR_PATCHING_REFUSED;
4191	}
4192	#endif
4193
4194	/* Make sure the code selector is wide open; otherwise refuse. */
4195	pCtx = CPUMQueryGuestCtxPtr(pVCpu);
4196	if (CPUMGetGuestCPL(pVCpu) == 0)
4197	{
4198	RTRCPTR pInstrGCFlat = SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(pCtx), pInstrGC);
4199	if (pInstrGCFlat != pInstrGC)
4200	{
4201	Log(("PATMR3InstallPatch: code selector not wide open: %04x:%RRv != %RRv eflags=%08x\n", pCtx->cs.Sel, pInstrGCFlat, pInstrGC, pCtx->eflags.u32));
4202	return VERR_PATCHING_REFUSED;
4203	}
4204	}
4205
4206	/* Note: the OpenBSD specific check will break if we allow additional patches to be installed (int 3)) */
4207	if (!(flags & PATMFL_GUEST_SPECIFIC))
4208	{
4209	/* New code. Make sure CSAM has a go at it first. */
4210	CSAMR3CheckCode(pVM, pInstrGC);
4211	}
4212
4213	/* Note: obsolete */
4214	if ( PATMIsPatchGCAddr(pVM, pInstrGC)
4215	&& (flags & PATMFL_MMIO_ACCESS))
4216	{
4217	RTRCUINTPTR offset;
4218	void *pvPatchCoreOffset;
4219
4220	/* Find the patch record. */
4221	offset = pInstrGC - pVM->patm.s.pPatchMemGC;
4222	pvPatchCoreOffset = RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, offset, false);
4223	if (pvPatchCoreOffset == NULL)
4224	{
4225	AssertMsgFailed(("PATMR3InstallPatch: patch not found at address %RRv!!\n", pInstrGC));
4226	return VERR_PATCH_NOT_FOUND; //fatal error
4227	}
4228	pPatchRec = PATM_PATCHREC_FROM_COREOFFSET(pvPatchCoreOffset);
4229
4230	return patmPatchPATMMMIOInstr(pVM, pInstrGC, &pPatchRec->patch);
4231	}
4232
4233	AssertReturn(!PATMIsPatchGCAddr(pVM, pInstrGC), VERR_PATCHING_REFUSED);
4234
4235	pPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
4236	if (pPatchRec)
4237	{
4238	Assert(!(flags & PATMFL_TRAMPOLINE));
4239
4240	/* Hints about existing patches are ignored. */
4241	if (flags & PATMFL_INSTR_HINT)
4242	return VERR_PATCHING_REFUSED;
4243
4244	if (pPatchRec->patch.uState == PATCH_DISABLE_PENDING)
4245	{
4246	Log(("PATMR3InstallPatch: disable operation is pending for patch at %RRv\n", pPatchRec->patch.pPrivInstrGC));
4247	PATMR3DisablePatch(pVM, pPatchRec->patch.pPrivInstrGC);
4248	Assert(pPatchRec->patch.uState == PATCH_DISABLED);
4249	}
4250
4251	if (pPatchRec->patch.uState == PATCH_DISABLED)
4252	{
4253	/* A patch, for which we previously received a hint, will be enabled and turned into a normal patch. */
4254	if (pPatchRec->patch.flags & PATMFL_INSTR_HINT)
4255	{
4256	Log(("Enabling HINTED patch %RRv\n", pInstrGC));
4257	pPatchRec->patch.flags &= ~PATMFL_INSTR_HINT;
4258	}
4259	else
4260	Log(("Enabling patch %RRv again\n", pInstrGC));
4261
4262	/** @todo we shouldn't disable and enable patches too often (it's relatively cheap, but pointless if it always happens) */
4263	rc = PATMR3EnablePatch(pVM, pInstrGC);
4264	if (RT_SUCCESS(rc))
4265	return VWRN_PATCH_ENABLED;
4266
4267	return rc;
4268	}
4269	if ( pPatchRec->patch.uState == PATCH_ENABLED
4270	\|\| pPatchRec->patch.uState == PATCH_DIRTY)
4271	{
4272	/*
4273	* The patch might have been overwritten.
4274	*/
4275	STAM_COUNTER_INC(&pVM->patm.s.StatOverwritten);
4276	if (pPatchRec->patch.uState != PATCH_REFUSED && pPatchRec->patch.uState != PATCH_UNUSABLE)
4277	{
4278	/* Patch must have been overwritten; remove it and pretend nothing happened. */
4279	Log(("Patch an existing patched instruction?!? (%RRv)\n", pInstrGC));
4280	if (pPatchRec->patch.flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_IDTHANDLER\|PATMFL_MMIO_ACCESS\|PATMFL_INT3_REPLACEMENT\|PATMFL_INT3_REPLACEMENT_BLOCK))
4281	{
4282	if (flags & PATMFL_IDTHANDLER)
4283	pPatchRec->patch.flags \|= (flags & (PATMFL_IDTHANDLER\|PATMFL_TRAPHANDLER\|PATMFL_INTHANDLER)); /* update the type */
4284
4285	return VERR_PATM_ALREADY_PATCHED; /* already done once */
4286	}
4287	}
4288	rc = PATMR3RemovePatch(pVM, pInstrGC);
4289	if (RT_FAILURE(rc))
4290	return VERR_PATCHING_REFUSED;
4291	}
4292	else
4293	{
4294	AssertMsg(pPatchRec->patch.uState == PATCH_REFUSED \|\| pPatchRec->patch.uState == PATCH_UNUSABLE, ("Patch an existing patched instruction?!? (%RRv, state=%d)\n", pInstrGC, pPatchRec->patch.uState));
4295	/* already tried it once! */
4296	return VERR_PATCHING_REFUSED;
4297	}
4298	}
4299
4300	RTGCPHYS GCPhys;
4301	rc = PGMGstGetPage(pVCpu, pInstrGC, NULL, &GCPhys);
4302	if (rc != VINF_SUCCESS)
4303	{
4304	Log(("PGMGstGetPage failed with %Rrc\n", rc));
4305	return rc;
4306	}
4307	/* Disallow patching instructions inside ROM code; complete function duplication is allowed though. */
4308	if ( !(flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_TRAMPOLINE))
4309	&& !PGMPhysIsGCPhysNormal(pVM, GCPhys))
4310	{
4311	Log(("Code at %RGv (phys %RGp) is in a ROM, MMIO or invalid page - refused\n", pInstrGC, GCPhys));
4312	return VERR_PATCHING_REFUSED;
4313	}
4314
4315	/* Initialize cache record for guest address translations. */
4316	bool fInserted;
4317	PATMP2GLOOKUPREC cacheRec;
4318	RT_ZERO(cacheRec);
4319
4320	pInstrHC = patmR3GCVirtToHCVirt(pVM, &cacheRec, pInstrGC);
4321	AssertReturn(pInstrHC, VERR_PATCHING_REFUSED);
4322
4323	/* Allocate patch record. */
4324	rc = MMHyperAlloc(pVM, sizeof(PATMPATCHREC), 0, MM_TAG_PATM_PATCH, (void **)&pPatchRec);
4325	if (RT_FAILURE(rc))
4326	{
4327	Log(("Out of memory!!!!\n"));
4328	return VERR_NO_MEMORY;
4329	}
4330	pPatchRec->Core.Key = pInstrGC;
4331	pPatchRec->patch.uState = PATCH_REFUSED; /* default value */
4332	/* Insert patch record into the lookup tree. */
4333	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTree, &pPatchRec->Core);
4334	Assert(fInserted);
4335
4336	pPatchRec->patch.pPrivInstrGC = pInstrGC;
4337	pPatchRec->patch.flags = flags;
4338	pPatchRec->patch.uOpMode = (flags & PATMFL_CODE32) ? DISCPUMODE_32BIT : DISCPUMODE_16BIT;
4339	pPatchRec->patch.pTrampolinePatchesHead = NULL;
4340
4341	pPatchRec->patch.pInstrGCLowest = pInstrGC;
4342	pPatchRec->patch.pInstrGCHighest = pInstrGC;
4343
4344	if (!(pPatchRec->patch.flags & (PATMFL_DUPLICATE_FUNCTION \| PATMFL_IDTHANDLER \| PATMFL_SYSENTER \| PATMFL_TRAMPOLINE)))
4345	{
4346	/*
4347	* Close proximity to an unusable patch is a possible hint that this patch would turn out to be dangerous too!
4348	*/
4349	PPATMPATCHREC pPatchNear = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, (pInstrGC + SIZEOF_NEARJUMP32 - 1), false);
4350	if (pPatchNear)
4351	{
4352	if (pPatchNear->patch.uState == PATCH_UNUSABLE && pInstrGC < pPatchNear->patch.pPrivInstrGC && pInstrGC + SIZEOF_NEARJUMP32 > pPatchNear->patch.pPrivInstrGC)
4353	{
4354	Log(("Dangerous patch; would overwrite the unusable patch at %RRv\n", pPatchNear->patch.pPrivInstrGC));
4355
4356	pPatchRec->patch.uState = PATCH_UNUSABLE;
4357	/*
4358	* Leave the new patch active as it's marked unusable; to prevent us from checking it over and over again
4359	*/
4360	return VERR_PATCHING_REFUSED;
4361	}
4362	}
4363	}
4364
4365	pPatchRec->patch.pTempInfo = (PPATCHINFOTEMP)MMR3HeapAllocZ(pVM, MM_TAG_PATM_PATCH, sizeof(PATCHINFOTEMP));
4366	if (pPatchRec->patch.pTempInfo == 0)
4367	{
4368	Log(("Out of memory!!!!\n"));
4369	return VERR_NO_MEMORY;
4370	}
4371
4372	disret = patmR3DisInstrNoStrOpMode(pVM, &pPatchRec->patch, pInstrGC, NULL, PATMREAD_ORGCODE, &cpu, &cbInstr);
4373	if (disret == false)
4374	{
4375	Log(("Disassembly failed (probably page not present) -> return to caller\n"));
4376	return VERR_PATCHING_REFUSED;
4377	}
4378
4379	AssertMsg(cbInstr <= MAX_INSTR_SIZE, ("privileged instruction too big %d!!\n", cbInstr));
4380	if (cbInstr > MAX_INSTR_SIZE)
4381	return VERR_PATCHING_REFUSED;
4382
4383	pPatchRec->patch.cbPrivInstr = cbInstr;
4384	pPatchRec->patch.opcode = cpu.pCurInstr->uOpcode;
4385
4386	/* Restricted hinting for now. */
4387	Assert(!(flags & PATMFL_INSTR_HINT) \|\| cpu.pCurInstr->uOpcode == OP_CLI);
4388
4389	/* Initialize cache record patch pointer. */
4390	cacheRec.pPatch = &pPatchRec->patch;
4391
4392	/* Allocate statistics slot */
4393	if (pVM->patm.s.uCurrentPatchIdx < PATM_STAT_MAX_COUNTERS)
4394	{
4395	pPatchRec->patch.uPatchIdx = pVM->patm.s.uCurrentPatchIdx++;
4396	}
4397	else
4398	{
4399	Log(("WARNING: Patch index wrap around!!\n"));
4400	pPatchRec->patch.uPatchIdx = PATM_STAT_INDEX_DUMMY;
4401	}
4402
4403	if (pPatchRec->patch.flags & PATMFL_TRAPHANDLER)
4404	{
4405	rc = patmInstallTrapTrampoline(pVM, pInstrGC, pPatchRec, &cacheRec);
4406	}
4407	else
4408	if (pPatchRec->patch.flags & (PATMFL_DUPLICATE_FUNCTION ))
4409	{
4410	rc = patmDuplicateFunction(pVM, pInstrGC, pPatchRec, &cacheRec);
4411	}
4412	else
4413	if (pPatchRec->patch.flags & PATMFL_TRAMPOLINE)
4414	{
4415	rc = patmCreateTrampoline(pVM, pInstrGC, pPatchRec);
4416	}
4417	else
4418	if (pPatchRec->patch.flags & PATMFL_REPLACE_FUNCTION_CALL)
4419	{
4420	rc = patmReplaceFunctionCall(pVM, &cpu, pInstrGC, &cacheRec);
4421	}
4422	else
4423	if (pPatchRec->patch.flags & PATMFL_INT3_REPLACEMENT)
4424	{
4425	rc = patmR3PatchInstrInt3(pVM, pInstrGC, pInstrHC, &cpu, &pPatchRec->patch);
4426	}
4427	else
4428	if (pPatchRec->patch.flags & PATMFL_MMIO_ACCESS)
4429	{
4430	rc = patmPatchMMIOInstr(pVM, pInstrGC, &cpu, &cacheRec);
4431	}
4432	else
4433	if (pPatchRec->patch.flags & (PATMFL_IDTHANDLER\|PATMFL_SYSENTER))
4434	{
4435	if (pPatchRec->patch.flags & PATMFL_SYSENTER)
4436	pPatchRec->patch.flags \|= PATMFL_IDTHANDLER; /* we treat a sysenter handler as an IDT handler */
4437
4438	rc = patmIdtHandler(pVM, pInstrGC, cbInstr, pPatchRec, &cacheRec);
4439	#ifdef VBOX_WITH_STATISTICS
4440	if ( rc == VINF_SUCCESS
4441	&& (pPatchRec->patch.flags & PATMFL_SYSENTER))
4442	{
4443	pVM->patm.s.uSysEnterPatchIdx = pPatchRec->patch.uPatchIdx;
4444	}
4445	#endif
4446	}
4447	else
4448	if (pPatchRec->patch.flags & PATMFL_GUEST_SPECIFIC)
4449	{
4450	switch (cpu.pCurInstr->uOpcode)
4451	{
4452	case OP_SYSENTER:
4453	case OP_PUSH:
4454	rc = patmR3InstallGuestSpecificPatch(pVM, &cpu, pInstrGC, pInstrHC, pPatchRec);
4455	if (rc == VINF_SUCCESS)
4456	{
4457	if (rc == VINF_SUCCESS)
4458	Log(("PATMR3InstallPatch GUEST: %s %RRv code32=%d\n", patmGetInstructionString(pPatchRec->patch.opcode, pPatchRec->patch.flags), pInstrGC, (flags & PATMFL_CODE32) ? 1 : 0));
4459	return rc;
4460	}
4461	break;
4462
4463	default:
4464	rc = VERR_NOT_IMPLEMENTED;
4465	break;
4466	}
4467	}
4468	else
4469	{
4470	switch (cpu.pCurInstr->uOpcode)
4471	{
4472	case OP_SYSENTER:
4473	rc = patmR3InstallGuestSpecificPatch(pVM, &cpu, pInstrGC, pInstrHC, pPatchRec);
4474	if (rc == VINF_SUCCESS)
4475	{
4476	Log(("PATMR3InstallPatch GUEST: %s %RRv code32=%d\n", patmGetInstructionString(pPatchRec->patch.opcode, pPatchRec->patch.flags), pInstrGC, (flags & PATMFL_CODE32) ? 1 : 0));
4477	return VINF_SUCCESS;
4478	}
4479	break;
4480
4481	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
4482	case OP_JO:
4483	case OP_JNO:
4484	case OP_JC:
4485	case OP_JNC:
4486	case OP_JE:
4487	case OP_JNE:
4488	case OP_JBE:
4489	case OP_JNBE:
4490	case OP_JS:
4491	case OP_JNS:
4492	case OP_JP:
4493	case OP_JNP:
4494	case OP_JL:
4495	case OP_JNL:
4496	case OP_JLE:
4497	case OP_JNLE:
4498	case OP_JECXZ:
4499	case OP_LOOP:
4500	case OP_LOOPNE:
4501	case OP_LOOPE:
4502	case OP_JMP:
4503	if (pPatchRec->patch.flags & PATMFL_JUMP_CONFLICT)
4504	{
4505	rc = patmPatchJump(pVM, pInstrGC, pInstrHC, &cpu, pPatchRec);
4506	break;
4507	}
4508	return VERR_NOT_IMPLEMENTED;
4509	#endif
4510
4511	case OP_PUSHF:
4512	case OP_CLI:
4513	Log(("PATMR3InstallPatch %s %RRv code32=%d\n", patmGetInstructionString(pPatchRec->patch.opcode, pPatchRec->patch.flags), pInstrGC, (flags & PATMFL_CODE32) ? 1 : 0));
4514	rc = patmR3PatchBlock(pVM, pInstrGC, pInstrHC, cpu.pCurInstr->uOpcode, cbInstr, pPatchRec);
4515	break;
4516
4517	#ifndef VBOX_WITH_SAFE_STR
4518	case OP_STR:
4519	#endif
4520	case OP_SGDT:
4521	case OP_SLDT:
4522	case OP_SIDT:
4523	case OP_CPUID:
4524	case OP_LSL:
4525	case OP_LAR:
4526	case OP_SMSW:
4527	case OP_VERW:
4528	case OP_VERR:
4529	case OP_IRET:
4530	#ifdef VBOX_WITH_RAW_RING1
4531	case OP_MOV:
4532	#endif
4533	rc = patmR3PatchInstrInt3(pVM, pInstrGC, pInstrHC, &cpu, &pPatchRec->patch);
4534	break;
4535
4536	default:
4537	return VERR_NOT_IMPLEMENTED;
4538	}
4539	}
4540
4541	if (rc != VINF_SUCCESS)
4542	{
4543	if (pPatchRec && pPatchRec->patch.nrPatch2GuestRecs)
4544	{
4545	patmEmptyTreeU32(pVM, &pPatchRec->patch.Patch2GuestAddrTree);
4546	pPatchRec->patch.nrPatch2GuestRecs = 0;
4547	}
4548	pVM->patm.s.uCurrentPatchIdx--;
4549	}
4550	else
4551	{
4552	rc = patmInsertPatchPages(pVM, &pPatchRec->patch);
4553	AssertRCReturn(rc, rc);
4554
4555	/* Keep track upper and lower boundaries of patched instructions */
4556	if (pPatchRec->patch.pInstrGCLowest < pVM->patm.s.pPatchedInstrGCLowest)
4557	pVM->patm.s.pPatchedInstrGCLowest = pPatchRec->patch.pInstrGCLowest;
4558	if (pPatchRec->patch.pInstrGCHighest > pVM->patm.s.pPatchedInstrGCHighest)
4559	pVM->patm.s.pPatchedInstrGCHighest = pPatchRec->patch.pInstrGCHighest;
4560
4561	Log(("Patch lowest %RRv highest %RRv\n", pPatchRec->patch.pInstrGCLowest, pPatchRec->patch.pInstrGCHighest));
4562	Log(("Global lowest %RRv highest %RRv\n", pVM->patm.s.pPatchedInstrGCLowest, pVM->patm.s.pPatchedInstrGCHighest));
4563
4564	STAM_COUNTER_ADD(&pVM->patm.s.StatInstalled, 1);
4565	STAM_COUNTER_ADD(&pVM->patm.s.StatPATMMemoryUsed, pPatchRec->patch.cbPatchBlockSize);
4566
4567	rc = VINF_SUCCESS;
4568
4569	/* Patch hints are not enabled by default. Only when the are actually encountered. */
4570	if (pPatchRec->patch.flags & PATMFL_INSTR_HINT)
4571	{
4572	rc = PATMR3DisablePatch(pVM, pInstrGC);
4573	AssertRCReturn(rc, rc);
4574	}
4575
4576	#ifdef VBOX_WITH_STATISTICS
4577	/* Register statistics counter */
4578	if (PATM_STAT_INDEX_IS_VALID(pPatchRec->patch.uPatchIdx))
4579	{
4580	STAMR3RegisterCallback(pVM, &pPatchRec->patch, STAMVISIBILITY_NOT_GUI, STAMUNIT_GOOD_BAD, patmResetStat, patmPrintStat, "Patch statistics",
4581	"/PATM/Stats/Patch/0x%RRv", pPatchRec->patch.pPrivInstrGC);
4582	#ifndef DEBUG_sandervl
4583	/* Full breakdown for the GUI. */
4584	STAMR3RegisterF(pVM, &pVM->patm.s.pStatsHC[pPatchRec->patch.uPatchIdx], STAMTYPE_RATIO_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_GOOD_BAD, PATMPatchType(pVM, &pPatchRec->patch),
4585	"/PATM/PatchBD/0x%RRv", pPatchRec->patch.pPrivInstrGC);
4586	STAMR3RegisterF(pVM, &pPatchRec->patch.pPatchBlockOffset,STAMTYPE_X32, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, NULL, "/PATM/PatchBD/0x%RRv/offPatchBlock", pPatchRec->patch.pPrivInstrGC);
4587	STAMR3RegisterF(pVM, &pPatchRec->patch.cbPatchBlockSize,STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, NULL, "/PATM/PatchBD/0x%RRv/cbPatchBlockSize", pPatchRec->patch.pPrivInstrGC);
4588	STAMR3RegisterF(pVM, &pPatchRec->patch.cbPatchJump, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, NULL, "/PATM/PatchBD/0x%RRv/cbPatchJump", pPatchRec->patch.pPrivInstrGC);
4589	STAMR3RegisterF(pVM, &pPatchRec->patch.cbPrivInstr, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, NULL, "/PATM/PatchBD/0x%RRv/cbPrivInstr", pPatchRec->patch.pPrivInstrGC);
4590	STAMR3RegisterF(pVM, &pPatchRec->patch.cCodeWrites, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/PatchBD/0x%RRv/cCodeWrites", pPatchRec->patch.pPrivInstrGC);
4591	STAMR3RegisterF(pVM, &pPatchRec->patch.cInvalidWrites, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/PatchBD/0x%RRv/cInvalidWrites", pPatchRec->patch.pPrivInstrGC);
4592	STAMR3RegisterF(pVM, &pPatchRec->patch.cTraps, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/PatchBD/0x%RRv/cTraps", pPatchRec->patch.pPrivInstrGC);
4593	STAMR3RegisterF(pVM, &pPatchRec->patch.flags, STAMTYPE_X64, STAMVISIBILITY_ALWAYS, STAMUNIT_NONE, NULL, "/PATM/PatchBD/0x%RRv/flags", pPatchRec->patch.pPrivInstrGC);
4594	STAMR3RegisterF(pVM, &pPatchRec->patch.nrJumpRecs, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/PatchBD/0x%RRv/nrJumpRecs", pPatchRec->patch.pPrivInstrGC);
4595	STAMR3RegisterF(pVM, &pPatchRec->patch.nrFixups, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/PatchBD/0x%RRv/nrFixups", pPatchRec->patch.pPrivInstrGC);
4596	STAMR3RegisterF(pVM, &pPatchRec->patch.opcode, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, NULL, "/PATM/PatchBD/0x%RRv/opcode", pPatchRec->patch.pPrivInstrGC);
4597	STAMR3RegisterF(pVM, &pPatchRec->patch.uOldState, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_NONE, NULL, "/PATM/PatchBD/0x%RRv/uOldState", pPatchRec->patch.pPrivInstrGC);
4598	STAMR3RegisterF(pVM, &pPatchRec->patch.uOpMode, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_NONE, NULL, "/PATM/PatchBD/0x%RRv/uOpMode", pPatchRec->patch.pPrivInstrGC);
4599	/// @todo change the state to be a callback so we can get a state mnemonic instead.
4600	STAMR3RegisterF(pVM, &pPatchRec->patch.uState, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_NONE, NULL, "/PATM/PatchBD/0x%RRv/uState", pPatchRec->patch.pPrivInstrGC);
4601	#endif
4602	}
4603	#endif
4604
4605	/* Add debug symbol. */
4606	patmR3DbgAddPatch(pVM, pPatchRec);
4607	}
4608	/* Free leftover lock if any. */
4609	if (cacheRec.Lock.pvMap)
4610	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
4611	return rc;
4612	}
4613
4614	/**
4615	* Query instruction size
4616	*
4617	* @returns VBox status code.
4618	* @param pVM The cross context VM structure.
4619	* @param pPatch Patch record
4620	* @param pInstrGC Instruction address
4621	*/
4622	static uint32_t patmGetInstrSize(PVM pVM, PPATCHINFO pPatch, RTRCPTR pInstrGC)
4623	{
4624	uint8_t *pInstrHC;
4625	PGMPAGEMAPLOCK Lock;
4626
4627	int rc = PGMPhysGCPtr2CCPtrReadOnly(VMMGetCpu(pVM), pInstrGC, (const void **)&pInstrHC, &Lock);
4628	if (rc == VINF_SUCCESS)
4629	{
4630	DISCPUSTATE cpu;
4631	bool disret;
4632	uint32_t cbInstr;
4633
4634	disret = patmR3DisInstr(pVM, pPatch, pInstrGC, pInstrHC, PATMREAD_ORGCODE \| PATMREAD_NOCHECK, &cpu, &cbInstr);
4635	PGMPhysReleasePageMappingLock(pVM, &Lock);
4636	if (disret)
4637	return cbInstr;
4638	}
4639	return 0;
4640	}
4641
4642	/**
4643	* Add patch to page record
4644	*
4645	* @returns VBox status code.
4646	* @param pVM The cross context VM structure.
4647	* @param pPage Page address
4648	* @param pPatch Patch record
4649	*/
4650	int patmAddPatchToPage(PVM pVM, RTRCUINTPTR pPage, PPATCHINFO pPatch)
4651	{
4652	PPATMPATCHPAGE pPatchPage;
4653	int rc;
4654
4655	Log(("patmAddPatchToPage: insert patch %RHv to page %RRv\n", pPatch, pPage));
4656
4657	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, pPage);
4658	if (pPatchPage)
4659	{
4660	Assert(pPatchPage->cCount <= pPatchPage->cMaxPatches);
4661	if (pPatchPage->cCount == pPatchPage->cMaxPatches)
4662	{
4663	uint32_t cMaxPatchesOld = pPatchPage->cMaxPatches;
4664	PPATCHINFO *papPatchOld = pPatchPage->papPatch;
4665
4666	pPatchPage->cMaxPatches += PATMPATCHPAGE_PREALLOC_INCREMENT;
4667	rc = MMHyperAlloc(pVM, sizeof(pPatchPage->papPatch[0]) * pPatchPage->cMaxPatches, 0, MM_TAG_PATM_PATCH,
4668	(void **)&pPatchPage->papPatch);
4669	if (RT_FAILURE(rc))
4670	{
4671	Log(("Out of memory!!!!\n"));
4672	return VERR_NO_MEMORY;
4673	}
4674	memcpy(pPatchPage->papPatch, papPatchOld, cMaxPatchesOld * sizeof(pPatchPage->papPatch[0]));
4675	MMHyperFree(pVM, papPatchOld);
4676	}
4677	pPatchPage->papPatch[pPatchPage->cCount] = pPatch;
4678	pPatchPage->cCount++;
4679	}
4680	else
4681	{
4682	bool fInserted;
4683
4684	rc = MMHyperAlloc(pVM, sizeof(PATMPATCHPAGE), 0, MM_TAG_PATM_PATCH, (void **)&pPatchPage);
4685	if (RT_FAILURE(rc))
4686	{
4687	Log(("Out of memory!!!!\n"));
4688	return VERR_NO_MEMORY;
4689	}
4690	pPatchPage->Core.Key = pPage;
4691	pPatchPage->cCount = 1;
4692	pPatchPage->cMaxPatches = PATMPATCHPAGE_PREALLOC_INCREMENT;
4693
4694	rc = MMHyperAlloc(pVM, sizeof(pPatchPage->papPatch[0]) * PATMPATCHPAGE_PREALLOC_INCREMENT, 0, MM_TAG_PATM_PATCH,
4695	(void **)&pPatchPage->papPatch);
4696	if (RT_FAILURE(rc))
4697	{
4698	Log(("Out of memory!!!!\n"));
4699	MMHyperFree(pVM, pPatchPage);
4700	return VERR_NO_MEMORY;
4701	}
4702	pPatchPage->papPatch[0] = pPatch;
4703
4704	fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, &pPatchPage->Core);
4705	Assert(fInserted);
4706	pVM->patm.s.cPageRecords++;
4707
4708	STAM_COUNTER_INC(&pVM->patm.s.StatPatchPageInserted);
4709	}
4710	CSAMR3MonitorPage(pVM, pPage, CSAM_TAG_PATM);
4711
4712	/* Get the closest guest instruction (from below) */
4713	PRECGUESTTOPATCH pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32GetBestFit(&pPatch->Guest2PatchAddrTree, pPage, true);
4714	Assert(pGuestToPatchRec);
4715	if (pGuestToPatchRec)
4716	{
4717	LogFlow(("patmAddPatchToPage: lowest patch page address %RRv current lowest %RRv\n", pGuestToPatchRec->Core.Key, pPatchPage->pLowestAddrGC));
4718	if ( pPatchPage->pLowestAddrGC == 0
4719	\|\| pPatchPage->pLowestAddrGC > (RTRCPTR)pGuestToPatchRec->Core.Key)
4720	{
4721	RTRCUINTPTR offset;
4722
4723	pPatchPage->pLowestAddrGC = (RTRCPTR)pGuestToPatchRec->Core.Key;
4724
4725	offset = pPatchPage->pLowestAddrGC & PAGE_OFFSET_MASK;
4726	/* If we're too close to the page boundary, then make sure an
4727	instruction from the previous page doesn't cross the
4728	boundary itself. */
4729	if (offset && offset < MAX_INSTR_SIZE)
4730	{
4731	/* Get the closest guest instruction (from above) */
4732	pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32GetBestFit(&pPatch->Guest2PatchAddrTree, pPage-1, false);
4733
4734	if (pGuestToPatchRec)
4735	{
4736	uint32_t size = patmGetInstrSize(pVM, pPatch, (RTRCPTR)pGuestToPatchRec->Core.Key);
4737	if ((RTRCUINTPTR)pGuestToPatchRec->Core.Key + size > pPage)
4738	{
4739	pPatchPage->pLowestAddrGC = pPage;
4740	LogFlow(("patmAddPatchToPage: new lowest %RRv\n", pPatchPage->pLowestAddrGC));
4741	}
4742	}
4743	}
4744	}
4745	}
4746
4747	/* Get the closest guest instruction (from above) */
4748	pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32GetBestFit(&pPatch->Guest2PatchAddrTree, pPage+PAGE_SIZE-1, false);
4749	Assert(pGuestToPatchRec);
4750	if (pGuestToPatchRec)
4751	{
4752	LogFlow(("patmAddPatchToPage: highest patch page address %RRv current highest %RRv\n", pGuestToPatchRec->Core.Key, pPatchPage->pHighestAddrGC));
4753	if ( pPatchPage->pHighestAddrGC == 0
4754	\|\| pPatchPage->pHighestAddrGC <= (RTRCPTR)pGuestToPatchRec->Core.Key)
4755	{
4756	pPatchPage->pHighestAddrGC = (RTRCPTR)pGuestToPatchRec->Core.Key;
4757	/* Increase by instruction size. */
4758	uint32_t size = patmGetInstrSize(pVM, pPatch, pPatchPage->pHighestAddrGC);
4759	//// Assert(size);
4760	pPatchPage->pHighestAddrGC += size;
4761	LogFlow(("patmAddPatchToPage: new highest %RRv\n", pPatchPage->pHighestAddrGC));
4762	}
4763	}
4764
4765	return VINF_SUCCESS;
4766	}
4767
4768	/**
4769	* Remove patch from page record
4770	*
4771	* @returns VBox status code.
4772	* @param pVM The cross context VM structure.
4773	* @param pPage Page address
4774	* @param pPatch Patch record
4775	*/
4776	int patmRemovePatchFromPage(PVM pVM, RTRCUINTPTR pPage, PPATCHINFO pPatch)
4777	{
4778	PPATMPATCHPAGE pPatchPage;
4779	int rc;
4780
4781	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, pPage);
4782	Assert(pPatchPage);
4783
4784	if (!pPatchPage)
4785	return VERR_INVALID_PARAMETER;
4786
4787	Assert(pPatchPage->cCount <= pPatchPage->cMaxPatches);
4788
4789	Log(("patmRemovePatchPage: remove patch %RHv from page %RRv\n", pPatch, pPage));
4790	if (pPatchPage->cCount > 1)
4791	{
4792	uint32_t i;
4793
4794	/* Used by multiple patches */
4795	for (i = 0; i < pPatchPage->cCount; i++)
4796	{
4797	if (pPatchPage->papPatch[i] == pPatch)
4798	{
4799	/* close the gap between the remaining pointers. */
4800	uint32_t cNew = --pPatchPage->cCount;
4801	if (i < cNew)
4802	pPatchPage->papPatch[i] = pPatchPage->papPatch[cNew];
4803	pPatchPage->papPatch[cNew] = NULL;
4804	return VINF_SUCCESS;
4805	}
4806	}
4807	AssertMsgFailed(("Unable to find patch %RHv in page %RRv\n", pPatch, pPage));
4808	}
4809	else
4810	{
4811	PPATMPATCHPAGE pPatchNode;
4812
4813	Log(("patmRemovePatchFromPage %RRv\n", pPage));
4814
4815	STAM_COUNTER_INC(&pVM->patm.s.StatPatchPageRemoved);
4816	pPatchNode = (PPATMPATCHPAGE)RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, pPage);
4817	Assert(pPatchNode && pPatchNode == pPatchPage);
4818
4819	Assert(pPatchPage->papPatch);
4820	rc = MMHyperFree(pVM, pPatchPage->papPatch);
4821	AssertRC(rc);
4822	rc = MMHyperFree(pVM, pPatchPage);
4823	AssertRC(rc);
4824	pVM->patm.s.cPageRecords--;
4825	}
4826	return VINF_SUCCESS;
4827	}
4828
4829	/**
4830	* Insert page records for all guest pages that contain instructions that were recompiled for this patch
4831	*
4832	* @returns VBox status code.
4833	* @param pVM The cross context VM structure.
4834	* @param pPatch Patch record
4835	*/
4836	int patmInsertPatchPages(PVM pVM, PPATCHINFO pPatch)
4837	{
4838	int rc;
4839	RTRCUINTPTR pPatchPageStart, pPatchPageEnd, pPage;
4840
4841	/* Insert the pages that contain patched instructions into a lookup tree for detecting self-modifying code. */
4842	pPatchPageStart = (RTRCUINTPTR)pPatch->pInstrGCLowest & PAGE_BASE_GC_MASK;
4843	pPatchPageEnd = (RTRCUINTPTR)pPatch->pInstrGCHighest & PAGE_BASE_GC_MASK;
4844
4845	/** @todo optimize better (large gaps between current and next used page) */
4846	for(pPage = pPatchPageStart; pPage <= pPatchPageEnd; pPage += PAGE_SIZE)
4847	{
4848	/* Get the closest guest instruction (from above) */
4849	PRECGUESTTOPATCH pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32GetBestFit(&pPatch->Guest2PatchAddrTree, pPage, true);
4850	if ( pGuestToPatchRec
4851	&& PAGE_ADDRESS(pGuestToPatchRec->Core.Key) == PAGE_ADDRESS(pPage)
4852	)
4853	{
4854	/* Code in page really patched -> add record */
4855	rc = patmAddPatchToPage(pVM, pPage, pPatch);
4856	AssertRC(rc);
4857	}
4858	}
4859	pPatch->flags \|= PATMFL_CODE_MONITORED;
4860	return VINF_SUCCESS;
4861	}
4862
4863	/**
4864	* Remove page records for all guest pages that contain instructions that were recompiled for this patch
4865	*
4866	* @returns VBox status code.
4867	* @param pVM The cross context VM structure.
4868	* @param pPatch Patch record
4869	*/
4870	static int patmRemovePatchPages(PVM pVM, PPATCHINFO pPatch)
4871	{
4872	int rc;
4873	RTRCUINTPTR pPatchPageStart, pPatchPageEnd, pPage;
4874
4875	/* Insert the pages that contain patched instructions into a lookup tree for detecting self-modifying code. */
4876	pPatchPageStart = (RTRCUINTPTR)pPatch->pInstrGCLowest & PAGE_BASE_GC_MASK;
4877	pPatchPageEnd = (RTRCUINTPTR)pPatch->pInstrGCHighest & PAGE_BASE_GC_MASK;
4878
4879	for(pPage = pPatchPageStart; pPage <= pPatchPageEnd; pPage += PAGE_SIZE)
4880	{
4881	/* Get the closest guest instruction (from above) */
4882	PRECGUESTTOPATCH pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32GetBestFit(&pPatch->Guest2PatchAddrTree, pPage, true);
4883	if ( pGuestToPatchRec
4884	&& PAGE_ADDRESS(pGuestToPatchRec->Core.Key) == PAGE_ADDRESS(pPage) /** @todo bird: PAGE_ADDRESS is for the current context really. check out these. */
4885	)
4886	{
4887	/* Code in page really patched -> remove record */
4888	rc = patmRemovePatchFromPage(pVM, pPage, pPatch);
4889	AssertRC(rc);
4890	}
4891	}
4892	pPatch->flags &= ~PATMFL_CODE_MONITORED;
4893	return VINF_SUCCESS;
4894	}
4895
4896	/**
4897	* Notifies PATM about a (potential) write to code that has been patched.
4898	*
4899	* @returns VBox status code.
4900	* @param pVM The cross context VM structure.
4901	* @param GCPtr GC pointer to write address
4902	* @param cbWrite Nr of bytes to write
4903	*
4904	*/
4905	VMMR3_INT_DECL(int) PATMR3PatchWrite(PVM pVM, RTRCPTR GCPtr, uint32_t cbWrite)
4906	{
4907	RTRCUINTPTR pWritePageStart, pWritePageEnd, pPage;
4908
4909	Log(("PATMR3PatchWrite %RRv %x\n", GCPtr, cbWrite));
4910
4911	Assert(VM_IS_EMT(pVM));
4912	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
4913
4914	/* Quick boundary check */
4915	if ( GCPtr < pVM->patm.s.pPatchedInstrGCLowest
4916	\|\| GCPtr > pVM->patm.s.pPatchedInstrGCHighest
4917	)
4918	return VINF_SUCCESS;
4919
4920	STAM_PROFILE_ADV_START(&pVM->patm.s.StatPatchWrite, a);
4921
4922	pWritePageStart = (RTRCUINTPTR)GCPtr & PAGE_BASE_GC_MASK;
4923	pWritePageEnd = ((RTRCUINTPTR)GCPtr + cbWrite - 1) & PAGE_BASE_GC_MASK;
4924
4925	for (pPage = pWritePageStart; pPage <= pWritePageEnd; pPage += PAGE_SIZE)
4926	{
4927	loop_start:
4928	PPATMPATCHPAGE pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, (RTRCPTR)pPage);
4929	if (pPatchPage)
4930	{
4931	uint32_t i;
4932	bool fValidPatchWrite = false;
4933
4934	/* Quick check to see if the write is in the patched part of the page */
4935	if ( pPatchPage->pLowestAddrGC > (RTRCPTR)((RTRCUINTPTR)GCPtr + cbWrite - 1)
4936	\|\| pPatchPage->pHighestAddrGC < GCPtr)
4937	{
4938	break;
4939	}
4940
4941	for (i=0;i<pPatchPage->cCount;i++)
4942	{
4943	if (pPatchPage->papPatch[i])
4944	{
4945	PPATCHINFO pPatch = pPatchPage->papPatch[i];
4946	RTRCPTR pPatchInstrGC;
4947	//unused: bool fForceBreak = false;
4948
4949	Assert(pPatchPage->papPatch[i]->flags & PATMFL_CODE_MONITORED);
4950	/** @todo inefficient and includes redundant checks for multiple pages. */
4951	for (uint32_t j=0; j<cbWrite; j++)
4952	{
4953	RTRCPTR pGuestPtrGC = (RTRCPTR)((RTRCUINTPTR)GCPtr + j);
4954
4955	if ( pPatch->cbPatchJump
4956	&& pGuestPtrGC >= pPatch->pPrivInstrGC
4957	&& pGuestPtrGC < pPatch->pPrivInstrGC + pPatch->cbPatchJump)
4958	{
4959	/* The guest is about to overwrite the 5 byte jump to patch code. Remove the patch. */
4960	Log(("PATMR3PatchWrite: overwriting jump to patch code -> remove patch.\n"));
4961	int rc = PATMR3RemovePatch(pVM, pPatch->pPrivInstrGC);
4962	if (rc == VINF_SUCCESS)
4963	/* Note: jump back to the start as the pPatchPage has been deleted or changed */
4964	goto loop_start;
4965
4966	continue;
4967	}
4968
4969	/* Find the closest instruction from below; the above quick check ensured that we are indeed in patched code */
4970	pPatchInstrGC = patmGuestGCPtrToPatchGCPtr(pVM, pPatch, pGuestPtrGC);
4971	if (!pPatchInstrGC)
4972	{
4973	RTRCPTR pClosestInstrGC;
4974	uint32_t size;
4975
4976	pPatchInstrGC = patmGuestGCPtrToClosestPatchGCPtr(pVM, pPatch, pGuestPtrGC);
4977	if (pPatchInstrGC)
4978	{
4979	pClosestInstrGC = patmPatchGCPtr2GuestGCPtr(pVM, pPatch, pPatchInstrGC);
4980	Assert(pClosestInstrGC <= pGuestPtrGC);
4981	size = patmGetInstrSize(pVM, pPatch, pClosestInstrGC);
4982	/* Check if this is not a write into a gap between two patches */
4983	if (pClosestInstrGC + size - 1 < pGuestPtrGC)
4984	pPatchInstrGC = 0;
4985	}
4986	}
4987	if (pPatchInstrGC)
4988	{
4989	uint32_t PatchOffset = pPatchInstrGC - pVM->patm.s.pPatchMemGC; /* Offset in memory reserved for PATM. */
4990
4991	fValidPatchWrite = true;
4992
4993	PRECPATCHTOGUEST pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32Get(&pPatch->Patch2GuestAddrTree, PatchOffset);
4994	Assert(pPatchToGuestRec);
4995	if (pPatchToGuestRec && !pPatchToGuestRec->fDirty)
4996	{
4997	Log(("PATMR3PatchWrite: Found patched instruction %RRv -> %RRv\n", pGuestPtrGC, pPatchInstrGC));
4998
4999	if (++pPatch->cCodeWrites > PATM_MAX_CODE_WRITES)
5000	{
5001	LogRel(("PATM: Disable block at %RRv - write %RRv-%RRv\n", pPatch->pPrivInstrGC, pGuestPtrGC, pGuestPtrGC+cbWrite));
5002
5003	patmR3MarkDirtyPatch(pVM, pPatch);
5004
5005	/* Note: jump back to the start as the pPatchPage has been deleted or changed */
5006	goto loop_start;
5007	}
5008	else
5009	{
5010	/* Replace the patch instruction with a breakpoint; when it's hit, then we'll attempt to recompile the instruction again. */
5011	uint8_t *pInstrHC = patmPatchGCPtr2PatchHCPtr(pVM, pPatchInstrGC);
5012
5013	pPatchToGuestRec->u8DirtyOpcode = *pInstrHC;
5014	pPatchToGuestRec->fDirty = true;
5015
5016	*pInstrHC = 0xCC;
5017
5018	STAM_COUNTER_INC(&pVM->patm.s.StatInstrDirty);
5019	}
5020	}
5021	/* else already marked dirty */
5022	}
5023	}
5024	}
5025	} /* for each patch */
5026
5027	if (fValidPatchWrite == false)
5028	{
5029	/* Write to a part of the page that either:
5030	* - doesn't contain any code (shared code/data); rather unlikely
5031	* - old code page that's no longer in active use.
5032	*/
5033	invalid_write_loop_start:
5034	pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, (RTRCPTR)pPage);
5035
5036	if (pPatchPage)
5037	{
5038	for (i=0;i<pPatchPage->cCount;i++)
5039	{
5040	PPATCHINFO pPatch = pPatchPage->papPatch[i];
5041
5042	if (pPatch->cInvalidWrites > PATM_MAX_INVALID_WRITES)
5043	{
5044	/* Note: possibly dangerous assumption that all future writes will be harmless. */
5045	if (pPatch->flags & PATMFL_IDTHANDLER)
5046	{
5047	LogRel(("PATM: Stop monitoring IDT handler pages at %RRv - invalid write %RRv-%RRv (this is not a fatal error)\n", pPatch->pPrivInstrGC, GCPtr, GCPtr+cbWrite));
5048
5049	Assert(pPatch->flags & PATMFL_CODE_MONITORED);
5050	int rc = patmRemovePatchPages(pVM, pPatch);
5051	AssertRC(rc);
5052	}
5053	else
5054	{
5055	LogRel(("PATM: Disable block at %RRv - invalid write %RRv-%RRv \n", pPatch->pPrivInstrGC, GCPtr, GCPtr+cbWrite));
5056	patmR3MarkDirtyPatch(pVM, pPatch);
5057	}
5058	/* Note: jump back to the start as the pPatchPage has been deleted or changed */
5059	goto invalid_write_loop_start;
5060	}
5061	} /* for */
5062	}
5063	}
5064	}
5065	}
5066	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWrite, a);
5067	return VINF_SUCCESS;
5068
5069	}
5070
5071	/**
5072	* Disable all patches in a flushed page
5073	*
5074	* @returns VBox status code
5075	* @param pVM The cross context VM structure.
5076	* @param addr GC address of the page to flush
5077	* @note Currently only called by CSAMR3FlushPage; optimization to avoid
5078	* having to double check if the physical address has changed
5079	*/
5080	VMMR3_INT_DECL(int) PATMR3FlushPage(PVM pVM, RTRCPTR addr)
5081	{
5082	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
5083
5084	addr &= PAGE_BASE_GC_MASK;
5085
5086	PPATMPATCHPAGE pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPage, addr);
5087	if (pPatchPage)
5088	{
5089	int i;
5090
5091	/* From top to bottom as the array is modified by PATMR3MarkDirtyPatch. */
5092	for (i=(int)pPatchPage->cCount-1;i>=0;i--)
5093	{
5094	if (pPatchPage->papPatch[i])
5095	{
5096	PPATCHINFO pPatch = pPatchPage->papPatch[i];
5097
5098	Log(("PATMR3FlushPage %RRv remove patch at %RRv\n", addr, pPatch->pPrivInstrGC));
5099	patmR3MarkDirtyPatch(pVM, pPatch);
5100	}
5101	}
5102	STAM_COUNTER_INC(&pVM->patm.s.StatFlushed);
5103	}
5104	return VINF_SUCCESS;
5105	}
5106
5107	/**
5108	* Checks if the instructions at the specified address has been patched already.
5109	*
5110	* @returns boolean, patched or not
5111	* @param pVM The cross context VM structure.
5112	* @param pInstrGC Guest context pointer to instruction
5113	*/
5114	VMMR3_INT_DECL(bool) PATMR3HasBeenPatched(PVM pVM, RTRCPTR pInstrGC)
5115	{
5116	Assert(!HMIsEnabled(pVM));
5117	PPATMPATCHREC pPatchRec;
5118	pPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
5119	if (pPatchRec && pPatchRec->patch.uState == PATCH_ENABLED)
5120	return true;
5121	return false;
5122	}
5123
5124	/**
5125	* Query the opcode of the original code that was overwritten by the 5 bytes patch jump
5126	*
5127	* @returns VBox status code.
5128	* @param pVM The cross context VM structure.
5129	* @param pInstrGC GC address of instr
5130	* @param pByte opcode byte pointer (OUT)
5131	*
5132	*/
5133	VMMR3DECL(int) PATMR3QueryOpcode(PVM pVM, RTRCPTR pInstrGC, uint8_t *pByte)
5134	{
5135	PPATMPATCHREC pPatchRec;
5136
5137	/** @todo this will not work for aliased pages! (never has, but so far not a problem for us) */
5138
5139	/* Shortcut. */
5140	if (!PATMIsEnabled(pVM))
5141	return VERR_PATCH_NOT_FOUND;
5142	Assert(!HMIsEnabled(pVM));
5143	if ( pInstrGC < pVM->patm.s.pPatchedInstrGCLowest
5144	\|\| pInstrGC > pVM->patm.s.pPatchedInstrGCHighest)
5145	return VERR_PATCH_NOT_FOUND;
5146
5147	pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC, false);
5148	// if the patch is enabled and the pointer lies within 5 bytes of this priv instr ptr, then we've got a hit!
5149	if ( pPatchRec
5150	&& pPatchRec->patch.uState == PATCH_ENABLED
5151	&& pInstrGC >= pPatchRec->patch.pPrivInstrGC
5152	&& pInstrGC < pPatchRec->patch.pPrivInstrGC + pPatchRec->patch.cbPatchJump)
5153	{
5154	RTRCPTR offset = pInstrGC - pPatchRec->patch.pPrivInstrGC;
5155	*pByte = pPatchRec->patch.aPrivInstr[offset];
5156
5157	if (pPatchRec->patch.cbPatchJump == 1)
5158	{
5159	Log(("PATMR3QueryOpcode: returning opcode %2X for instruction at %RRv\n", *pByte, pInstrGC));
5160	}
5161	STAM_COUNTER_ADD(&pVM->patm.s.StatNrOpcodeRead, 1);
5162	return VINF_SUCCESS;
5163	}
5164	return VERR_PATCH_NOT_FOUND;
5165	}
5166
5167	/**
5168	* Read instruction bytes of the original code that was overwritten by the 5
5169	* bytes patch jump.
5170	*
5171	* @returns VINF_SUCCESS or VERR_PATCH_NOT_FOUND.
5172	* @param pVM The cross context VM structure.
5173	* @param GCPtrInstr GC address of instr
5174	* @param pbDst The output buffer.
5175	* @param cbToRead The maximum number bytes to read.
5176	* @param pcbRead Where to return the acutal number of bytes read.
5177	*/
5178	VMMR3_INT_DECL(int) PATMR3ReadOrgInstr(PVM pVM, RTGCPTR32 GCPtrInstr, uint8_t pbDst, size_t cbToRead, size_t pcbRead)
5179	{
5180	/* Shortcut. */
5181	if (!PATMIsEnabled(pVM))
5182	return VERR_PATCH_NOT_FOUND;
5183	Assert(!HMIsEnabled(pVM));
5184	if ( GCPtrInstr < pVM->patm.s.pPatchedInstrGCLowest
5185	\|\| GCPtrInstr > pVM->patm.s.pPatchedInstrGCHighest)
5186	return VERR_PATCH_NOT_FOUND;
5187
5188	/** @todo this will not work for aliased pages! (never has, but so far not a problem for us) */
5189
5190	/*
5191	* If the patch is enabled and the pointer lies within 5 bytes of this
5192	* priv instr ptr, then we've got a hit!
5193	*/
5194	RTGCPTR32 off;
5195	PPATMPATCHREC pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree,
5196	GCPtrInstr, false /fAbove/);
5197	if ( pPatchRec
5198	&& pPatchRec->patch.uState == PATCH_ENABLED
5199	&& (off = GCPtrInstr - pPatchRec->patch.pPrivInstrGC) < pPatchRec->patch.cbPatchJump)
5200	{
5201	uint8_t const *pbSrc = &pPatchRec->patch.aPrivInstr[off];
5202	uint32_t const cbMax = pPatchRec->patch.cbPatchJump - off;
5203	if (cbToRead > cbMax)
5204	cbToRead = cbMax;
5205	switch (cbToRead)
5206	{
5207	case 5: pbDst[4] = pbSrc[4]; /* fall thru */
5208	case 4: pbDst[3] = pbSrc[3]; /* fall thru */
5209	case 3: pbDst[2] = pbSrc[2]; /* fall thru */
5210	case 2: pbDst[1] = pbSrc[1]; /* fall thru */
5211	case 1: pbDst[0] = pbSrc[0];
5212	break;
5213	default:
5214	memcpy(pbDst, pbSrc, cbToRead);
5215	}
5216	*pcbRead = cbToRead;
5217
5218	if (pPatchRec->patch.cbPatchJump == 1)
5219	Log(("PATMR3ReadOrgInstr: returning opcode %.*Rhxs for instruction at %RX32\n", cbToRead, pbSrc, GCPtrInstr));
5220	STAM_COUNTER_ADD(&pVM->patm.s.StatNrOpcodeRead, 1);
5221	return VINF_SUCCESS;
5222	}
5223
5224	return VERR_PATCH_NOT_FOUND;
5225	}
5226
5227	/**
5228	* Disable patch for privileged instruction at specified location
5229	*
5230	* @returns VBox status code.
5231	* @param pVM The cross context VM structure.
5232	* @param pInstrGC Guest context point to privileged instruction
5233	*
5234	* @note returns failure if patching is not allowed or possible
5235	*
5236	*/
5237	VMMR3_INT_DECL(int) PATMR3DisablePatch(PVM pVM, RTRCPTR pInstrGC)
5238	{
5239	PPATMPATCHREC pPatchRec;
5240	PPATCHINFO pPatch;
5241
5242	Log(("PATMR3DisablePatch: %RRv\n", pInstrGC));
5243	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
5244	pPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
5245	if (pPatchRec)
5246	{
5247	int rc = VINF_SUCCESS;
5248
5249	pPatch = &pPatchRec->patch;
5250
5251	/* Already disabled? */
5252	if (pPatch->uState == PATCH_DISABLED)
5253	return VINF_SUCCESS;
5254
5255	/* Clear the IDT entries for the patch we're disabling. */
5256	/* Note: very important as we clear IF in the patch itself */
5257	/** @todo this needs to be changed */
5258	if (pPatch->flags & PATMFL_IDTHANDLER)
5259	{
5260	uint32_t iGate;
5261
5262	iGate = TRPMR3QueryGateByHandler(pVM, PATCHCODE_PTR_GC(pPatch));
5263	if (iGate != (uint32_t)~0)
5264	{
5265	TRPMR3SetGuestTrapHandler(pVM, iGate, TRPM_INVALID_HANDLER);
5266	if (++cIDTHandlersDisabled < 256)
5267	LogRel(("PATM: Disabling IDT %x patch handler %RRv\n", iGate, pInstrGC));
5268	}
5269	}
5270
5271	/* Mark the entry with a breakpoint in case somebody else calls it later on (cli patch used as a function, function, trampoline or idt patches) */
5272	if ( pPatch->pPatchBlockOffset
5273	&& pPatch->uState == PATCH_ENABLED)
5274	{
5275	Log(("Invalidate patch at %RRv (HC=%RRv)\n", PATCHCODE_PTR_GC(pPatch), PATCHCODE_PTR_HC(pPatch)));
5276	pPatch->bDirtyOpcode = *PATCHCODE_PTR_HC(pPatch);
5277	*PATCHCODE_PTR_HC(pPatch) = 0xCC;
5278	}
5279
5280	/* IDT or function patches haven't changed any guest code. */
5281	if (pPatch->flags & PATMFL_PATCHED_GUEST_CODE)
5282	{
5283	Assert(pPatch->flags & PATMFL_MUST_INSTALL_PATCHJMP);
5284	Assert(!(pPatch->flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_IDTHANDLER\|PATMFL_TRAMPOLINE\|PATMFL_INT3_REPLACEMENT\|PATMFL_INT3_REPLACEMENT_BLOCK)));
5285
5286	if (pPatch->uState != PATCH_REFUSED)
5287	{
5288	uint8_t temp[16];
5289
5290	Assert(pPatch->cbPatchJump < sizeof(temp));
5291
5292	/* Let's first check if the guest code is still the same. */
5293	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), temp, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
5294	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT);
5295	if (rc == VINF_SUCCESS)
5296	{
5297	RTRCINTPTR displ = (RTRCUINTPTR)PATCHCODE_PTR_GC(pPatch) - ((RTRCUINTPTR)pPatch->pPrivInstrGC + SIZEOF_NEARJUMP32);
5298
5299	if ( temp[0] != 0xE9 /* jmp opcode */
5300	\|\| (RTRCINTPTR )(&temp[1]) != displ
5301	)
5302	{
5303	Log(("PATMR3DisablePatch: Can't disable a patch who's guest code has changed!!\n"));
5304	STAM_COUNTER_INC(&pVM->patm.s.StatOverwritten);
5305	/* Remove it completely */
5306	pPatch->uState = PATCH_DISABLED; /* don't call PATMR3DisablePatch again */
5307	rc = PATMR3RemovePatch(pVM, pInstrGC);
5308	AssertRC(rc);
5309	return VWRN_PATCH_REMOVED;
5310	}
5311	patmRemoveJumpToPatch(pVM, pPatch);
5312	}
5313	else
5314	{
5315	Log(("PATMR3DisablePatch: unable to disable patch -> mark PATCH_DISABLE_PENDING\n"));
5316	pPatch->uState = PATCH_DISABLE_PENDING;
5317	}
5318	}
5319	else
5320	{
5321	AssertMsgFailed(("Patch was refused!\n"));
5322	return VERR_PATCH_ALREADY_DISABLED;
5323	}
5324	}
5325	else
5326	if (pPatch->flags & (PATMFL_INT3_REPLACEMENT\|PATMFL_INT3_REPLACEMENT_BLOCK))
5327	{
5328	uint8_t temp[16];
5329
5330	Assert(pPatch->cbPatchJump < sizeof(temp));
5331
5332	/* Let's first check if the guest code is still the same. */
5333	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), temp, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
5334	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT);
5335	if (rc == VINF_SUCCESS)
5336	{
5337	if (temp[0] != 0xCC)
5338	{
5339	Log(("PATMR3DisablePatch: Can't disable a patch who's guest code has changed!!\n"));
5340	STAM_COUNTER_INC(&pVM->patm.s.StatOverwritten);
5341	/* Remove it completely */
5342	pPatch->uState = PATCH_DISABLED; /* don't call PATMR3DisablePatch again */
5343	rc = PATMR3RemovePatch(pVM, pInstrGC);
5344	AssertRC(rc);
5345	return VWRN_PATCH_REMOVED;
5346	}
5347	patmDeactivateInt3Patch(pVM, pPatch);
5348	}
5349	}
5350
5351	if (rc == VINF_SUCCESS)
5352	{
5353	/* Save old state and mark this one as disabled (so it can be enabled later on). */
5354	if (pPatch->uState == PATCH_DISABLE_PENDING)
5355	{
5356	/* Just to be safe, let's make sure this one can never be reused; the patch might be marked dirty already (int3 at start) */
5357	pPatch->uState = PATCH_UNUSABLE;
5358	}
5359	else
5360	if (pPatch->uState != PATCH_DIRTY)
5361	{
5362	pPatch->uOldState = pPatch->uState;
5363	pPatch->uState = PATCH_DISABLED;
5364	}
5365	STAM_COUNTER_ADD(&pVM->patm.s.StatDisabled, 1);
5366	}
5367
5368	Log(("PATMR3DisablePatch: disabled patch at %RRv\n", pInstrGC));
5369	return VINF_SUCCESS;
5370	}
5371	Log(("Patch not found!\n"));
5372	return VERR_PATCH_NOT_FOUND;
5373	}
5374
5375	/**
5376	* Permanently disable patch for privileged instruction at specified location
5377	*
5378	* @returns VBox status code.
5379	* @param pVM The cross context VM structure.
5380	* @param pInstrGC Guest context instruction pointer
5381	* @param pConflictAddr Guest context pointer which conflicts with specified patch
5382	* @param pConflictPatch Conflicting patch
5383	*
5384	*/
5385	static int patmDisableUnusablePatch(PVM pVM, RTRCPTR pInstrGC, RTRCPTR pConflictAddr, PPATCHINFO pConflictPatch)
5386	{
5387	NOREF(pConflictAddr);
5388	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
5389	PATCHINFO patch;
5390	DISCPUSTATE cpu;
5391	R3PTRTYPE(uint8_t *) pInstrHC;
5392	uint32_t cbInstr;
5393	bool disret;
5394	int rc;
5395
5396	RT_ZERO(patch);
5397	pInstrHC = patmR3GCVirtToHCVirt(pVM, &patch, pInstrGC);
5398	disret = patmR3DisInstr(pVM, &patch, pInstrGC, pInstrHC, PATMREAD_ORGCODE, &cpu, &cbInstr);
5399	/*
5400	* If it's a 5 byte relative jump, then we can work around the problem by replacing the 32 bits relative offset
5401	* with one that jumps right into the conflict patch.
5402	* Otherwise we must disable the conflicting patch to avoid serious problems.
5403	*/
5404	if ( disret == true
5405	&& (pConflictPatch->flags & PATMFL_CODE32)
5406	&& (cpu.pCurInstr->uOpcode == OP_JMP \|\| (cpu.pCurInstr->fOpType & DISOPTYPE_COND_CONTROLFLOW))
5407	&& (cpu.Param1.fUse & DISUSE_IMMEDIATE32_REL))
5408	{
5409	/* Hint patches must be enabled first. */
5410	if (pConflictPatch->flags & PATMFL_INSTR_HINT)
5411	{
5412	Log(("Enabling HINTED patch %RRv\n", pConflictPatch->pPrivInstrGC));
5413	pConflictPatch->flags &= ~PATMFL_INSTR_HINT;
5414	rc = PATMR3EnablePatch(pVM, pConflictPatch->pPrivInstrGC);
5415	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PATCH_NOT_FOUND);
5416	/* Enabling might fail if the patched code has changed in the meantime. */
5417	if (rc != VINF_SUCCESS)
5418	return rc;
5419	}
5420
5421	rc = PATMR3InstallPatch(pVM, pInstrGC, PATMFL_CODE32 \| PATMFL_JUMP_CONFLICT);
5422	if (RT_SUCCESS(rc))
5423	{
5424	Log(("PATM -> CONFLICT: Installed JMP patch for patch conflict at %RRv\n", pInstrGC));
5425	STAM_COUNTER_INC(&pVM->patm.s.StatFixedConflicts);
5426	return VINF_SUCCESS;
5427	}
5428	}
5429	#else
5430	RT_NOREF_PV(pInstrGC);
5431	#endif
5432
5433	if (pConflictPatch->opcode == OP_CLI)
5434	{
5435	/* Turn it into an int3 patch; our GC trap handler will call the generated code manually. */
5436	Log(("PATM -> CONFLICT: Found active patch at instruction %RRv with target %RRv -> turn into int 3 patch!!\n", pInstrGC, pConflictPatch->pPrivInstrGC));
5437	int rc = PATMR3DisablePatch(pVM, pConflictPatch->pPrivInstrGC);
5438	if (rc == VWRN_PATCH_REMOVED)
5439	return VINF_SUCCESS;
5440	if (RT_SUCCESS(rc))
5441	{
5442	pConflictPatch->flags &= ~(PATMFL_MUST_INSTALL_PATCHJMP\|PATMFL_INSTR_HINT);
5443	pConflictPatch->flags \|= PATMFL_INT3_REPLACEMENT_BLOCK;
5444	rc = PATMR3EnablePatch(pVM, pConflictPatch->pPrivInstrGC);
5445	if (rc == VERR_PATCH_NOT_FOUND)
5446	return VINF_SUCCESS; /* removed already */
5447
5448	AssertRC(rc);
5449	if (RT_SUCCESS(rc))
5450	{
5451	STAM_COUNTER_INC(&pVM->patm.s.StatInt3Callable);
5452	return VINF_SUCCESS;
5453	}
5454	}
5455	/* else turned into unusable patch (see below) */
5456	}
5457	else
5458	{
5459	Log(("PATM -> CONFLICT: Found active patch at instruction %RRv with target %RRv -> DISABLING it!!\n", pInstrGC, pConflictPatch->pPrivInstrGC));
5460	int rc = PATMR3DisablePatch(pVM, pConflictPatch->pPrivInstrGC);
5461	if (rc == VWRN_PATCH_REMOVED)
5462	return VINF_SUCCESS;
5463	}
5464
5465	/* No need to monitor the code anymore. */
5466	if (pConflictPatch->flags & PATMFL_CODE_MONITORED)
5467	{
5468	int rc = patmRemovePatchPages(pVM, pConflictPatch);
5469	AssertRC(rc);
5470	}
5471	pConflictPatch->uState = PATCH_UNUSABLE;
5472	STAM_COUNTER_INC(&pVM->patm.s.StatUnusable);
5473	return VERR_PATCH_DISABLED;
5474	}
5475
5476	/**
5477	* Enable patch for privileged instruction at specified location
5478	*
5479	* @returns VBox status code.
5480	* @param pVM The cross context VM structure.
5481	* @param pInstrGC Guest context point to privileged instruction
5482	*
5483	* @note returns failure if patching is not allowed or possible
5484	*
5485	*/
5486	VMMR3_INT_DECL(int) PATMR3EnablePatch(PVM pVM, RTRCPTR pInstrGC)
5487	{
5488	PPATMPATCHREC pPatchRec;
5489	PPATCHINFO pPatch;
5490
5491	Log(("PATMR3EnablePatch %RRv\n", pInstrGC));
5492	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
5493	pPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
5494	if (pPatchRec)
5495	{
5496	int rc = VINF_SUCCESS;
5497
5498	pPatch = &pPatchRec->patch;
5499
5500	if (pPatch->uState == PATCH_DISABLED)
5501	{
5502	if (pPatch->flags & PATMFL_MUST_INSTALL_PATCHJMP)
5503	{
5504	Assert(!(pPatch->flags & PATMFL_PATCHED_GUEST_CODE));
5505	uint8_t temp[16];
5506
5507	Assert(pPatch->cbPatchJump < sizeof(temp));
5508
5509	/* Let's first check if the guest code is still the same. */
5510	int rc2 = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), temp, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
5511	AssertRC(rc2);
5512	if (rc2 == VINF_SUCCESS)
5513	{
5514	if (memcmp(temp, pPatch->aPrivInstr, pPatch->cbPatchJump))
5515	{
5516	Log(("PATMR3EnablePatch: Can't enable a patch who's guest code has changed!!\n"));
5517	STAM_COUNTER_INC(&pVM->patm.s.StatOverwritten);
5518	/* Remove it completely */
5519	rc = PATMR3RemovePatch(pVM, pInstrGC);
5520	AssertRC(rc);
5521	return VERR_PATCH_NOT_FOUND;
5522	}
5523
5524	PATMP2GLOOKUPREC cacheRec;
5525	RT_ZERO(cacheRec);
5526	cacheRec.pPatch = pPatch;
5527
5528	rc2 = patmGenJumpToPatch(pVM, pPatch, &cacheRec, false);
5529	/* Free leftover lock if any. */
5530	if (cacheRec.Lock.pvMap)
5531	{
5532	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
5533	cacheRec.Lock.pvMap = NULL;
5534	}
5535	AssertRC(rc2);
5536	if (RT_FAILURE(rc2))
5537	return rc2;
5538
5539	#ifdef DEBUG
5540	{
5541	DISCPUSTATE cpu;
5542	char szOutput[256];
5543	uint32_t cbInstr;
5544	uint32_t i = 0;
5545	bool disret;
5546	while(i < pPatch->cbPatchJump)
5547	{
5548	disret = patmR3DisInstrToStr(pVM, pPatch, pPatch->pPrivInstrGC + i, NULL, PATMREAD_ORGCODE,
5549	&cpu, &cbInstr, szOutput, sizeof(szOutput));
5550	Log(("Renewed patch instr: %s", szOutput));
5551	i += cbInstr;
5552	}
5553	}
5554	#endif
5555	}
5556	}
5557	else
5558	if (pPatch->flags & (PATMFL_INT3_REPLACEMENT\|PATMFL_INT3_REPLACEMENT_BLOCK))
5559	{
5560	uint8_t temp[16];
5561
5562	Assert(pPatch->cbPatchJump < sizeof(temp));
5563
5564	/* Let's first check if the guest code is still the same. */
5565	int rc2 = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), temp, pPatch->pPrivInstrGC, pPatch->cbPatchJump);
5566	AssertRC(rc2);
5567
5568	if (memcmp(temp, pPatch->aPrivInstr, pPatch->cbPatchJump))
5569	{
5570	Log(("PATMR3EnablePatch: Can't enable a patch who's guest code has changed!!\n"));
5571	STAM_COUNTER_INC(&pVM->patm.s.StatOverwritten);
5572	rc = PATMR3RemovePatch(pVM, pInstrGC);
5573	AssertRC(rc);
5574	return VERR_PATCH_NOT_FOUND;
5575	}
5576
5577	rc2 = patmActivateInt3Patch(pVM, pPatch);
5578	if (RT_FAILURE(rc2))
5579	return rc2;
5580	}
5581
5582	pPatch->uState = pPatch->uOldState; //restore state
5583
5584	/* Restore the entry breakpoint with the original opcode (see PATMR3DisablePatch). */
5585	if (pPatch->pPatchBlockOffset)
5586	*PATCHCODE_PTR_HC(pPatch) = pPatch->bDirtyOpcode;
5587
5588	STAM_COUNTER_ADD(&pVM->patm.s.StatEnabled, 1);
5589	}
5590	else
5591	Log(("PATMR3EnablePatch: Unable to enable patch %RRv with state %d\n", pInstrGC, pPatch->uState));
5592
5593	return rc;
5594	}
5595	return VERR_PATCH_NOT_FOUND;
5596	}
5597
5598	/**
5599	* Remove patch for privileged instruction at specified location
5600	*
5601	* @returns VBox status code.
5602	* @param pVM The cross context VM structure.
5603	* @param pPatchRec Patch record
5604	* @param fForceRemove Remove all patches
5605	*/
5606	int patmR3RemovePatch(PVM pVM, PPATMPATCHREC pPatchRec, bool fForceRemove)
5607	{
5608	PPATCHINFO pPatch;
5609
5610	pPatch = &pPatchRec->patch;
5611
5612	/* Strictly forbidden to remove such patches. There can be dependencies!! */
5613	if (!fForceRemove && (pPatch->flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_CODE_REFERENCED)))
5614	{
5615	Log(("PATMRemovePatch %RRv REFUSED!\n", pPatch->pPrivInstrGC));
5616	return VERR_ACCESS_DENIED;
5617	}
5618	Log(("PATMRemovePatch %RRv\n", pPatch->pPrivInstrGC));
5619
5620	/* Note: NEVER EVER REUSE PATCH MEMORY */
5621	/* Note: PATMR3DisablePatch puts a breakpoint (0xCC) at the entry of this patch */
5622
5623	if (pPatchRec->patch.pPatchBlockOffset)
5624	{
5625	PAVLOU32NODECORE pNode;
5626
5627	pNode = RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, pPatchRec->patch.pPatchBlockOffset);
5628	Assert(pNode);
5629	}
5630
5631	if (pPatchRec->patch.flags & PATMFL_CODE_MONITORED)
5632	{
5633	int rc = patmRemovePatchPages(pVM, &pPatchRec->patch);
5634	AssertRC(rc);
5635	}
5636
5637	#ifdef VBOX_WITH_STATISTICS
5638	if (PATM_STAT_INDEX_IS_VALID(pPatchRec->patch.uPatchIdx))
5639	{
5640	STAMR3DeregisterF(pVM->pUVM, "/PATM/Stats/Patch/0x%RRv", pPatchRec->patch.pPrivInstrGC);
5641	STAMR3DeregisterF(pVM->pUVM, "/PATM/PatchBD/0x%RRv*", pPatchRec->patch.pPrivInstrGC);
5642	}
5643	#endif
5644
5645	/* Note: no need to free Guest2PatchAddrTree as those records share memory with Patch2GuestAddrTree records. */
5646	patmEmptyTreeU32(pVM, &pPatch->Patch2GuestAddrTree);
5647	pPatch->nrPatch2GuestRecs = 0;
5648	Assert(pPatch->Patch2GuestAddrTree == 0);
5649
5650	patmEmptyTree(pVM, &pPatch->FixupTree);
5651	pPatch->nrFixups = 0;
5652	Assert(pPatch->FixupTree == 0);
5653
5654	if (pPatchRec->patch.pTempInfo)
5655	MMR3HeapFree(pPatchRec->patch.pTempInfo);
5656
5657	/* Note: might fail, because it has already been removed (e.g. during reset). */
5658	RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pPatchRec->Core.Key);
5659
5660	/* Free the patch record */
5661	MMHyperFree(pVM, pPatchRec);
5662	return VINF_SUCCESS;
5663	}
5664
5665	/**
5666	* RTAvlU32DoWithAll() worker.
5667	* Checks whether the current trampoline instruction is the jump to the target patch
5668	* and updates the displacement to jump to the new target.
5669	*
5670	* @returns VBox status code.
5671	* @retval VERR_ALREADY_EXISTS if the jump was found.
5672	* @param pNode The current patch to guest record to check.
5673	* @param pvUser The refresh state.
5674	*/
5675	static DECLCALLBACK(int) patmR3PatchRefreshFindTrampolinePatch(PAVLU32NODECORE pNode, void *pvUser)
5676	{
5677	PRECPATCHTOGUEST pPatch2GuestRec = (PRECPATCHTOGUEST)pNode;
5678	PPATMREFRESHPATCH pRefreshPatchState = (PPATMREFRESHPATCH)pvUser;
5679	PVM pVM = pRefreshPatchState->pVM;
5680
5681	uint8_t pPatchInstr = (uint8_t )(pVM->patm.s.pPatchMemHC + pPatch2GuestRec->Core.Key);
5682
5683	/*
5684	* Check if the patch instruction starts with a jump.
5685	* ASSUMES that there is no other patch to guest record that starts
5686	* with a jump.
5687	*/
5688	if (*pPatchInstr == 0xE9)
5689	{
5690	/* Jump found, update the displacement. */
5691	RTRCPTR pPatchTargetGC = patmGuestGCPtrToPatchGCPtr(pVM, pRefreshPatchState->pPatchRec,
5692	pRefreshPatchState->pPatchTrampoline->pPrivInstrGC);
5693	int32_t displ = pPatchTargetGC - (pVM->patm.s.pPatchMemGC + pPatch2GuestRec->Core.Key + SIZEOF_NEARJUMP32);
5694
5695	LogFlow(("Updating trampoline patch new patch target %RRv, new displacment %d (old was %d)\n",
5696	pPatchTargetGC, displ, (uint32_t )&pPatchInstr[1]));
5697
5698	(uint32_t )&pPatchInstr[1] = displ;
5699	return VERR_ALREADY_EXISTS; /** @todo better return code */
5700	}
5701
5702	return VINF_SUCCESS;
5703	}
5704
5705	/**
5706	* Attempt to refresh the patch by recompiling its entire code block
5707	*
5708	* @returns VBox status code.
5709	* @param pVM The cross context VM structure.
5710	* @param pPatchRec Patch record
5711	*/
5712	int patmR3RefreshPatch(PVM pVM, PPATMPATCHREC pPatchRec)
5713	{
5714	PPATCHINFO pPatch;
5715	int rc;
5716	RTRCPTR pInstrGC = pPatchRec->patch.pPrivInstrGC;
5717	PTRAMPREC pTrampolinePatchesHead = NULL;
5718
5719	Log(("patmR3RefreshPatch: attempt to refresh patch at %RRv\n", pInstrGC));
5720
5721	pPatch = &pPatchRec->patch;
5722	AssertReturn(pPatch->flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_IDTHANDLER\|PATMFL_TRAPHANDLER), VERR_PATCHING_REFUSED);
5723	if (pPatch->flags & PATMFL_EXTERNAL_JUMP_INSIDE)
5724	{
5725	if (!pPatch->pTrampolinePatchesHead)
5726	{
5727	/*
5728	* It is sometimes possible that there are trampoline patches to this patch
5729	* but they are not recorded (after a saved state load for example).
5730	* Refuse to refresh those patches.
5731	* Can hurt performance in theory if the patched code is modified by the guest
5732	* and is executed often. However most of the time states are saved after the guest
5733	* code was modified and is not updated anymore afterwards so this shouldn't be a
5734	* big problem.
5735	*/
5736	Log(("patmR3RefreshPatch: refused because external jumps to this patch exist but the jumps are not recorded\n"));
5737	return VERR_PATCHING_REFUSED;
5738	}
5739	Log(("patmR3RefreshPatch: external jumps to this patch exist, updating\n"));
5740	pTrampolinePatchesHead = pPatch->pTrampolinePatchesHead;
5741	}
5742
5743	/* Note: quite ugly to enable/disable/remove/insert old and new patches, but there's no easy way around it. */
5744
5745	rc = PATMR3DisablePatch(pVM, pInstrGC);
5746	AssertRC(rc);
5747
5748	/* Kick it out of the lookup tree to make sure PATMR3InstallPatch doesn't fail (hack alert) */
5749	RTAvloU32Remove(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pPatchRec->Core.Key);
5750	#ifdef VBOX_WITH_STATISTICS
5751	if (PATM_STAT_INDEX_IS_VALID(pPatchRec->patch.uPatchIdx))
5752	{
5753	STAMR3DeregisterF(pVM->pUVM, "/PATM/Stats/Patch/0x%RRv", pPatchRec->patch.pPrivInstrGC);
5754	STAMR3DeregisterF(pVM->pUVM, "/PATM/PatchBD/0x%RRv*", pPatchRec->patch.pPrivInstrGC);
5755	}
5756	#endif
5757
5758	/** Note: We don't attempt to reuse patch memory here as it's quite common that the new code block requires more memory. */
5759
5760	/* Attempt to install a new patch. */
5761	rc = PATMR3InstallPatch(pVM, pInstrGC, pPatch->flags & (PATMFL_CODE32\|PATMFL_IDTHANDLER\|PATMFL_INTHANDLER\|PATMFL_TRAPHANDLER\|PATMFL_DUPLICATE_FUNCTION\|PATMFL_TRAPHANDLER_WITH_ERRORCODE\|PATMFL_IDTHANDLER_WITHOUT_ENTRYPOINT));
5762	if (RT_SUCCESS(rc))
5763	{
5764	RTRCPTR pPatchTargetGC;
5765	PPATMPATCHREC pNewPatchRec;
5766
5767	/* Determine target address in new patch */
5768	pPatchTargetGC = PATMR3QueryPatchGCPtr(pVM, pInstrGC);
5769	Assert(pPatchTargetGC);
5770	if (!pPatchTargetGC)
5771	{
5772	rc = VERR_PATCHING_REFUSED;
5773	goto failure;
5774	}
5775
5776	/* Reset offset into patch memory to put the next code blocks right at the beginning. */
5777	pPatch->uCurPatchOffset = 0;
5778
5779	/* insert jump to new patch in old patch block */
5780	rc = patmPatchGenPatchJump(pVM, pPatch, pInstrGC, pPatchTargetGC, false /* no lookup record */);
5781	if (RT_FAILURE(rc))
5782	goto failure;
5783
5784	pNewPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
5785	Assert(pNewPatchRec); /* can't fail */
5786
5787	/* Remove old patch (only do that when everything is finished) */
5788	int rc2 = patmR3RemovePatch(pVM, pPatchRec, true /* force removal */);
5789	AssertRC(rc2);
5790
5791	/* Put the new patch back into the tree, because removing the old one kicked this one out. (hack alert) */
5792	bool fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTree, &pNewPatchRec->Core);
5793	Assert(fInserted); NOREF(fInserted);
5794
5795	Log(("PATM: patmR3RefreshPatch: succeeded to refresh patch at %RRv \n", pInstrGC));
5796	STAM_COUNTER_INC(&pVM->patm.s.StatPatchRefreshSuccess);
5797
5798	/* Used by another patch, so don't remove it! */
5799	pNewPatchRec->patch.flags \|= PATMFL_CODE_REFERENCED;
5800
5801	if (pTrampolinePatchesHead)
5802	{
5803	/* Update all trampoline patches to jump to the new patch. */
5804	PTRAMPREC pTrampRec = NULL;
5805	PATMREFRESHPATCH RefreshPatch;
5806
5807	RefreshPatch.pVM = pVM;
5808	RefreshPatch.pPatchRec = &pNewPatchRec->patch;
5809
5810	pTrampRec = pTrampolinePatchesHead;
5811
5812	while (pTrampRec)
5813	{
5814	PPATCHINFO pPatchTrampoline = &pTrampRec->pPatchTrampoline->patch;
5815
5816	RefreshPatch.pPatchTrampoline = pPatchTrampoline;
5817	/*
5818	* We have to find the right patch2guest record because there might be others
5819	* for statistics.
5820	*/
5821	rc = RTAvlU32DoWithAll(&pPatchTrampoline->Patch2GuestAddrTree, true,
5822	patmR3PatchRefreshFindTrampolinePatch, &RefreshPatch);
5823	Assert(rc == VERR_ALREADY_EXISTS);
5824	rc = VINF_SUCCESS;
5825	pTrampRec = pTrampRec->pNext;
5826	}
5827	pNewPatchRec->patch.pTrampolinePatchesHead = pTrampolinePatchesHead;
5828	pNewPatchRec->patch.flags \|= PATMFL_EXTERNAL_JUMP_INSIDE;
5829	/* Clear the list of trampoline patches for the old patch (safety precaution). */
5830	pPatchRec->patch.pTrampolinePatchesHead = NULL;
5831	}
5832	}
5833
5834	failure:
5835	if (RT_FAILURE(rc))
5836	{
5837	LogRel(("PATM: patmR3RefreshPatch: failed to refresh patch at %RRv. Reactiving old one. \n", pInstrGC));
5838
5839	/* Remove the new inactive patch */
5840	rc = PATMR3RemovePatch(pVM, pInstrGC);
5841	AssertRC(rc);
5842
5843	/* Put the old patch back into the tree (or else it won't be saved) (hack alert) */
5844	bool fInserted = RTAvloU32Insert(&pVM->patm.s.PatchLookupTreeHC->PatchTree, &pPatchRec->Core);
5845	Assert(fInserted); NOREF(fInserted);
5846
5847	/* Enable again in case the dirty instruction is near the end and there are safe code paths. */
5848	int rc2 = PATMR3EnablePatch(pVM, pInstrGC);
5849	AssertRC(rc2);
5850
5851	STAM_COUNTER_INC(&pVM->patm.s.StatPatchRefreshFailed);
5852	}
5853	return rc;
5854	}
5855
5856	/**
5857	* Find patch for privileged instruction at specified location
5858	*
5859	* @returns Patch structure pointer if found; else NULL
5860	* @param pVM The cross context VM structure.
5861	* @param pInstrGC Guest context point to instruction that might lie
5862	* within 5 bytes of an existing patch jump
5863	* @param fIncludeHints Include hinted patches or not
5864	*/
5865	PPATCHINFO patmFindActivePatchByEntrypoint(PVM pVM, RTRCPTR pInstrGC, bool fIncludeHints)
5866	{
5867	PPATMPATCHREC pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC, false);
5868	/* if the patch is enabled, the pointer is not identical to the privileged patch ptr and it lies within 5 bytes of this priv instr ptr, then we've got a hit! */
5869	if (pPatchRec)
5870	{
5871	if ( pPatchRec->patch.uState == PATCH_ENABLED
5872	&& (pPatchRec->patch.flags & PATMFL_PATCHED_GUEST_CODE)
5873	&& pInstrGC > pPatchRec->patch.pPrivInstrGC
5874	&& pInstrGC < pPatchRec->patch.pPrivInstrGC + pPatchRec->patch.cbPatchJump)
5875	{
5876	Log(("Found active patch at %RRv (org %RRv)\n", pInstrGC, pPatchRec->patch.pPrivInstrGC));
5877	return &pPatchRec->patch;
5878	}
5879	else
5880	if ( fIncludeHints
5881	&& pPatchRec->patch.uState == PATCH_DISABLED
5882	&& (pPatchRec->patch.flags & PATMFL_INSTR_HINT)
5883	&& pInstrGC > pPatchRec->patch.pPrivInstrGC
5884	&& pInstrGC < pPatchRec->patch.pPrivInstrGC + pPatchRec->patch.cbPatchJump)
5885	{
5886	Log(("Found HINT patch at %RRv (org %RRv)\n", pInstrGC, pPatchRec->patch.pPrivInstrGC));
5887	return &pPatchRec->patch;
5888	}
5889	}
5890	return NULL;
5891	}
5892
5893	/**
5894	* Checks whether the GC address is inside a generated patch jump
5895	*
5896	* @returns true -> yes, false -> no
5897	* @param pVM The cross context VM structure.
5898	* @param pAddr Guest context address.
5899	* @param pPatchAddr Guest context patch address (if true).
5900	*/
5901	VMMR3_INT_DECL(bool) PATMR3IsInsidePatchJump(PVM pVM, RTRCPTR pAddr, PRTGCPTR32 pPatchAddr)
5902	{
5903	RTRCPTR addr;
5904	PPATCHINFO pPatch;
5905
5906	Assert(!HMIsEnabled(pVM));
5907	if (PATMIsEnabled(pVM) == false)
5908	return false;
5909
5910	if (pPatchAddr == NULL)
5911	pPatchAddr = &addr;
5912
5913	*pPatchAddr = 0;
5914
5915	pPatch = patmFindActivePatchByEntrypoint(pVM, pAddr);
5916	if (pPatch)
5917	*pPatchAddr = pPatch->pPrivInstrGC;
5918
5919	return *pPatchAddr == 0 ? false : true;
5920	}
5921
5922	/**
5923	* Remove patch for privileged instruction at specified location
5924	*
5925	* @returns VBox status code.
5926	* @param pVM The cross context VM structure.
5927	* @param pInstrGC Guest context point to privileged instruction
5928	*
5929	* @note returns failure if patching is not allowed or possible
5930	*
5931	*/
5932	VMMR3_INT_DECL(int) PATMR3RemovePatch(PVM pVM, RTRCPTR pInstrGC)
5933	{
5934	PPATMPATCHREC pPatchRec;
5935
5936	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
5937	pPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC);
5938	if (pPatchRec)
5939	{
5940	int rc = PATMR3DisablePatch(pVM, pInstrGC);
5941	if (rc == VWRN_PATCH_REMOVED)
5942	return VINF_SUCCESS;
5943
5944	return patmR3RemovePatch(pVM, pPatchRec, false);
5945	}
5946	AssertFailed();
5947	return VERR_PATCH_NOT_FOUND;
5948	}
5949
5950	/**
5951	* Mark patch as dirty
5952	*
5953	* @returns VBox status code.
5954	* @param pVM The cross context VM structure.
5955	* @param pPatch Patch record
5956	*
5957	* @note returns failure if patching is not allowed or possible
5958	*
5959	*/
5960	static int patmR3MarkDirtyPatch(PVM pVM, PPATCHINFO pPatch)
5961	{
5962	if (pPatch->pPatchBlockOffset)
5963	{
5964	Log(("Invalidate patch at %RRv (HC=%RRv)\n", PATCHCODE_PTR_GC(pPatch), PATCHCODE_PTR_HC(pPatch)));
5965	pPatch->bDirtyOpcode = *PATCHCODE_PTR_HC(pPatch);
5966	*PATCHCODE_PTR_HC(pPatch) = 0xCC;
5967	}
5968
5969	STAM_COUNTER_INC(&pVM->patm.s.StatDirty);
5970	/* Put back the replaced instruction. */
5971	int rc = PATMR3DisablePatch(pVM, pPatch->pPrivInstrGC);
5972	if (rc == VWRN_PATCH_REMOVED)
5973	return VINF_SUCCESS;
5974
5975	/* Note: we don't restore patch pages for patches that are not enabled! */
5976	/* Note: be careful when changing this behaviour!! */
5977
5978	/* The patch pages are no longer marked for self-modifying code detection */
5979	if (pPatch->flags & PATMFL_CODE_MONITORED)
5980	{
5981	rc = patmRemovePatchPages(pVM, pPatch);
5982	AssertRCReturn(rc, rc);
5983	}
5984	pPatch->uState = PATCH_DIRTY;
5985
5986	/* Paranoia; make sure this patch is not somewhere in the callchain, so prevent ret instructions from succeeding. */
5987	CTXSUFF(pVM->patm.s.pGCState)->Psp = PATM_STACK_SIZE;
5988
5989	return VINF_SUCCESS;
5990	}
5991
5992	/**
5993	* Query the corresponding GC instruction pointer from a pointer inside the patch block itself
5994	*
5995	* @returns VBox status code.
5996	* @param pVM The cross context VM structure.
5997	* @param pPatch Patch block structure pointer
5998	* @param pPatchGC GC address in patch block
5999	*/
6000	RTRCPTR patmPatchGCPtr2GuestGCPtr(PVM pVM, PPATCHINFO pPatch, RCPTRTYPE(uint8_t *) pPatchGC)
6001	{
6002	Assert(pPatch->Patch2GuestAddrTree);
6003	/* Get the closest record from below. */
6004	PRECPATCHTOGUEST pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32GetBestFit(&pPatch->Patch2GuestAddrTree, pPatchGC - pVM->patm.s.pPatchMemGC, false);
6005	if (pPatchToGuestRec)
6006	return pPatchToGuestRec->pOrgInstrGC;
6007
6008	return 0;
6009	}
6010
6011	/**
6012	* Converts Guest code GC ptr to Patch code GC ptr (if found)
6013	*
6014	* @returns corresponding GC pointer in patch block
6015	* @param pVM The cross context VM structure.
6016	* @param pPatch Current patch block pointer
6017	* @param pInstrGC Guest context pointer to privileged instruction
6018	*
6019	*/
6020	RTRCPTR patmGuestGCPtrToPatchGCPtr(PVM pVM, PPATCHINFO pPatch, RCPTRTYPE(uint8_t*) pInstrGC)
6021	{
6022	if (pPatch->Guest2PatchAddrTree)
6023	{
6024	PRECGUESTTOPATCH pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32Get(&pPatch->Guest2PatchAddrTree, pInstrGC);
6025	if (pGuestToPatchRec)
6026	return pVM->patm.s.pPatchMemGC + pGuestToPatchRec->PatchOffset;
6027	}
6028
6029	return 0;
6030	}
6031
6032	#ifdef PATM_RESOLVE_CONFLICTS_WITH_JUMP_PATCHES
6033	/**
6034	* Converts Guest code GC ptr to Patch code GC ptr (if found)
6035	*
6036	* @returns corresponding GC pointer in patch block
6037	* @param pVM The cross context VM structure.
6038	* @param pInstrGC Guest context pointer to privileged instruction
6039	*/
6040	static RTRCPTR patmR3GuestGCPtrToPatchGCPtrSimple(PVM pVM, RCPTRTYPE(uint8_t*) pInstrGC)
6041	{
6042	PPATMPATCHREC pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pInstrGC, false);
6043	if (pPatchRec && pPatchRec->patch.uState == PATCH_ENABLED && pInstrGC >= pPatchRec->patch.pPrivInstrGC)
6044	return patmGuestGCPtrToPatchGCPtr(pVM, &pPatchRec->patch, pInstrGC);
6045	return NIL_RTRCPTR;
6046	}
6047	#endif
6048
6049	/**
6050	* Converts Guest code GC ptr to Patch code GC ptr (or nearest from below if no
6051	* identical match)
6052	*
6053	* @returns corresponding GC pointer in patch block
6054	* @param pVM The cross context VM structure.
6055	* @param pPatch Current patch block pointer
6056	* @param pInstrGC Guest context pointer to privileged instruction
6057	*
6058	*/
6059	RTRCPTR patmGuestGCPtrToClosestPatchGCPtr(PVM pVM, PPATCHINFO pPatch, RCPTRTYPE(uint8_t*) pInstrGC)
6060	{
6061	PRECGUESTTOPATCH pGuestToPatchRec = (PRECGUESTTOPATCH)RTAvlU32GetBestFit(&pPatch->Guest2PatchAddrTree, pInstrGC, false);
6062	if (pGuestToPatchRec)
6063	return pVM->patm.s.pPatchMemGC + pGuestToPatchRec->PatchOffset;
6064	return NIL_RTRCPTR;
6065	}
6066
6067	/**
6068	* Query the corresponding GC instruction pointer from a pointer inside the patch block itself
6069	*
6070	* @returns original GC instruction pointer or 0 if not found
6071	* @param pVM The cross context VM structure.
6072	* @param pPatchGC GC address in patch block
6073	* @param pEnmState State of the translated address (out)
6074	*
6075	*/
6076	VMMR3_INT_DECL(RTRCPTR) PATMR3PatchToGCPtr(PVM pVM, RTRCPTR pPatchGC, PATMTRANSSTATE *pEnmState)
6077	{
6078	PPATMPATCHREC pPatchRec;
6079	void *pvPatchCoreOffset;
6080	RTRCPTR pPrivInstrGC;
6081
6082	Assert(PATMIsPatchGCAddr(pVM, pPatchGC));
6083	Assert(!HMIsEnabled(pVM));
6084	pvPatchCoreOffset = RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, pPatchGC - pVM->patm.s.pPatchMemGC, false);
6085	if (pvPatchCoreOffset == 0)
6086	{
6087	Log(("PATMR3PatchToGCPtr failed for %RRv offset %x\n", pPatchGC, pPatchGC - pVM->patm.s.pPatchMemGC));
6088	return 0;
6089	}
6090	pPatchRec = PATM_PATCHREC_FROM_COREOFFSET(pvPatchCoreOffset);
6091	pPrivInstrGC = patmPatchGCPtr2GuestGCPtr(pVM, &pPatchRec->patch, pPatchGC);
6092	if (pEnmState)
6093	{
6094	AssertMsg(pPrivInstrGC && ( pPatchRec->patch.uState == PATCH_ENABLED
6095	\|\| pPatchRec->patch.uState == PATCH_DIRTY
6096	\|\| pPatchRec->patch.uState == PATCH_DISABLE_PENDING
6097	\|\| pPatchRec->patch.uState == PATCH_UNUSABLE),
6098	("pPrivInstrGC=%RRv uState=%d\n", pPrivInstrGC, pPatchRec->patch.uState));
6099
6100	if ( !pPrivInstrGC
6101	\|\| pPatchRec->patch.uState == PATCH_UNUSABLE
6102	\|\| pPatchRec->patch.uState == PATCH_REFUSED)
6103	{
6104	pPrivInstrGC = 0;
6105	*pEnmState = PATMTRANS_FAILED;
6106	}
6107	else
6108	if (pVM->patm.s.pGCStateHC->GCPtrInhibitInterrupts == pPrivInstrGC)
6109	{
6110	*pEnmState = PATMTRANS_INHIBITIRQ;
6111	}
6112	else
6113	if ( pPatchRec->patch.uState == PATCH_ENABLED
6114	&& !(pPatchRec->patch.flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_IDTHANDLER\|PATMFL_TRAMPOLINE))
6115	&& pPrivInstrGC > pPatchRec->patch.pPrivInstrGC
6116	&& pPrivInstrGC < pPatchRec->patch.pPrivInstrGC + pPatchRec->patch.cbPatchJump)
6117	{
6118	*pEnmState = PATMTRANS_OVERWRITTEN;
6119	}
6120	else
6121	if (patmFindActivePatchByEntrypoint(pVM, pPrivInstrGC))
6122	{
6123	*pEnmState = PATMTRANS_OVERWRITTEN;
6124	}
6125	else
6126	if (pPrivInstrGC == pPatchRec->patch.pPrivInstrGC)
6127	{
6128	*pEnmState = PATMTRANS_PATCHSTART;
6129	}
6130	else
6131	*pEnmState = PATMTRANS_SAFE;
6132	}
6133	return pPrivInstrGC;
6134	}
6135
6136	/**
6137	* Returns the GC pointer of the patch for the specified GC address
6138	*
6139	* @returns VBox status code.
6140	* @param pVM The cross context VM structure.
6141	* @param pAddrGC Guest context address
6142	*/
6143	VMMR3_INT_DECL(RTRCPTR) PATMR3QueryPatchGCPtr(PVM pVM, RTRCPTR pAddrGC)
6144	{
6145	PPATMPATCHREC pPatchRec;
6146
6147	Assert(!HMIsEnabled(pVM));
6148
6149	/* Find the patch record. */
6150	pPatchRec = (PPATMPATCHREC)RTAvloU32Get(&pVM->patm.s.PatchLookupTreeHC->PatchTree, pAddrGC);
6151	/** @todo we should only use patches that are enabled! always did this, but it's incorrect! */
6152	if (pPatchRec && (pPatchRec->patch.uState == PATCH_ENABLED \|\| pPatchRec->patch.uState == PATCH_DIRTY))
6153	return PATCHCODE_PTR_GC(&pPatchRec->patch);
6154	return NIL_RTRCPTR;
6155	}
6156
6157	/**
6158	* Attempt to recover dirty instructions
6159	*
6160	* @returns VBox status code.
6161	* @param pVM The cross context VM structure.
6162	* @param pCtx Pointer to the guest CPU context.
6163	* @param pPatch Patch record.
6164	* @param pPatchToGuestRec Patch to guest address record.
6165	* @param pEip GC pointer of trapping instruction.
6166	*/
6167	static int patmR3HandleDirtyInstr(PVM pVM, PCPUMCTX pCtx, PPATMPATCHREC pPatch, PRECPATCHTOGUEST pPatchToGuestRec, RTRCPTR pEip)
6168	{
6169	DISCPUSTATE CpuOld, CpuNew;
6170	uint8_t pPatchInstrHC, pCurPatchInstrHC;
6171	int rc;
6172	RTRCPTR pCurInstrGC, pCurPatchInstrGC;
6173	uint32_t cbDirty;
6174	PRECPATCHTOGUEST pRec;
6175	RTRCPTR const pOrgInstrGC = pPatchToGuestRec->pOrgInstrGC;
6176	PVMCPU pVCpu = VMMGetCpu0(pVM);
6177	Log(("patmR3HandleDirtyInstr: dirty instruction at %RRv (%RRv)\n", pEip, pOrgInstrGC));
6178
6179	pRec = pPatchToGuestRec;
6180	pCurInstrGC = pOrgInstrGC;
6181	pCurPatchInstrGC = pEip;
6182	cbDirty = 0;
6183	pPatchInstrHC = patmPatchGCPtr2PatchHCPtr(pVM, pCurPatchInstrGC);
6184
6185	/* Find all adjacent dirty instructions */
6186	while (true)
6187	{
6188	if (pRec->fJumpTarget)
6189	{
6190	LogRel(("PATM: patmR3HandleDirtyInstr: dirty instruction at %RRv (%RRv) ignored, because instruction in function was reused as target of jump\n", pEip, pOrgInstrGC));
6191	pRec->fDirty = false;
6192	return VERR_PATCHING_REFUSED;
6193	}
6194
6195	/* Restore original instruction opcode byte so we can check if the write was indeed safe. */
6196	pCurPatchInstrHC = patmPatchGCPtr2PatchHCPtr(pVM, pCurPatchInstrGC);
6197	*pCurPatchInstrHC = pRec->u8DirtyOpcode;
6198
6199	/* Only harmless instructions are acceptable. */
6200	rc = CPUMR3DisasmInstrCPU(pVM, pVCpu, pCtx, pCurPatchInstrGC, &CpuOld, 0);
6201	if ( RT_FAILURE(rc)
6202	\|\| !(CpuOld.pCurInstr->fOpType & DISOPTYPE_HARMLESS))
6203	{
6204	if (RT_SUCCESS(rc))
6205	cbDirty += CpuOld.cbInstr;
6206	else
6207	if (!cbDirty)
6208	cbDirty = 1;
6209	break;
6210	}
6211
6212	#ifdef DEBUG
6213	char szBuf[256];
6214	DBGFR3DisasInstrEx(pVM->pUVM, pVCpu->idCpu, pCtx->cs.Sel, pCurPatchInstrGC, DBGF_DISAS_FLAGS_DEFAULT_MODE,
6215	szBuf, sizeof(szBuf), NULL);
6216	Log(("DIRTY: %s\n", szBuf));
6217	#endif
6218	/* Mark as clean; if we fail we'll let it always fault. */
6219	pRec->fDirty = false;
6220
6221	/* Remove old lookup record. */
6222	patmr3RemoveP2GLookupRecord(pVM, &pPatch->patch, pCurPatchInstrGC);
6223	pPatchToGuestRec = NULL;
6224
6225	pCurPatchInstrGC += CpuOld.cbInstr;
6226	cbDirty += CpuOld.cbInstr;
6227
6228	/* Let's see if there's another dirty instruction right after. */
6229	pRec = (PRECPATCHTOGUEST)RTAvlU32GetBestFit(&pPatch->patch.Patch2GuestAddrTree, pCurPatchInstrGC - pVM->patm.s.pPatchMemGC, true);
6230	if (!pRec \|\| !pRec->fDirty)
6231	break; /* no more dirty instructions */
6232
6233	/* In case of complex instructions the next guest instruction could be quite far off. */
6234	pCurPatchInstrGC = pRec->Core.Key + pVM->patm.s.pPatchMemGC;
6235	}
6236
6237	if ( RT_SUCCESS(rc)
6238	&& (CpuOld.pCurInstr->fOpType & DISOPTYPE_HARMLESS)
6239	)
6240	{
6241	uint32_t cbLeft;
6242
6243	pCurPatchInstrHC = pPatchInstrHC;
6244	pCurPatchInstrGC = pEip;
6245	cbLeft = cbDirty;
6246
6247	while (cbLeft && RT_SUCCESS(rc))
6248	{
6249	bool fValidInstr;
6250
6251	rc = CPUMR3DisasmInstrCPU(pVM, pVCpu, pCtx, pCurInstrGC, &CpuNew, 0);
6252
6253	fValidInstr = !!(CpuNew.pCurInstr->fOpType & DISOPTYPE_HARMLESS);
6254	if ( !fValidInstr
6255	&& (CpuNew.pCurInstr->fOpType & DISOPTYPE_RELATIVE_CONTROLFLOW)
6256	)
6257	{
6258	RTRCPTR pTargetGC = PATMResolveBranch(&CpuNew, pCurInstrGC);
6259
6260	if ( pTargetGC >= pOrgInstrGC
6261	&& pTargetGC <= pOrgInstrGC + cbDirty
6262	)
6263	{
6264	/* A relative jump to an instruction inside or to the end of the dirty block is acceptable. */
6265	fValidInstr = true;
6266	}
6267	}
6268
6269	/* If the instruction is completely harmless (which implies a 1:1 patch copy). */
6270	if ( rc == VINF_SUCCESS
6271	&& CpuNew.cbInstr <= cbLeft /* must still fit */
6272	&& fValidInstr
6273	)
6274	{
6275	#ifdef DEBUG
6276	char szBuf[256];
6277	DBGFR3DisasInstrEx(pVM->pUVM, pVCpu->idCpu, pCtx->cs.Sel, pCurInstrGC, DBGF_DISAS_FLAGS_DEFAULT_MODE,
6278	szBuf, sizeof(szBuf), NULL);
6279	Log(("NEW: %s\n", szBuf));
6280	#endif
6281
6282	/* Copy the new instruction. */
6283	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), pCurPatchInstrHC, pCurInstrGC, CpuNew.cbInstr);
6284	AssertRC(rc);
6285
6286	/* Add a new lookup record for the duplicated instruction. */
6287	patmR3AddP2GLookupRecord(pVM, &pPatch->patch, pCurPatchInstrHC, pCurInstrGC, PATM_LOOKUP_BOTHDIR);
6288	}
6289	else
6290	{
6291	#ifdef DEBUG
6292	char szBuf[256];
6293	DBGFR3DisasInstrEx(pVM->pUVM, pVCpu->idCpu, pCtx->cs.Sel, pCurInstrGC, DBGF_DISAS_FLAGS_DEFAULT_MODE,
6294	szBuf, sizeof(szBuf), NULL);
6295	Log(("NEW: %s (FAILED)\n", szBuf));
6296	#endif
6297	/* Restore the old lookup record for the duplicated instruction. */
6298	patmR3AddP2GLookupRecord(pVM, &pPatch->patch, pCurPatchInstrHC, pCurInstrGC, PATM_LOOKUP_BOTHDIR);
6299
6300	/** @todo in theory we need to restore the lookup records for the remaining dirty instructions too! */
6301	rc = VERR_PATCHING_REFUSED;
6302	break;
6303	}
6304	pCurInstrGC += CpuNew.cbInstr;
6305	pCurPatchInstrHC += CpuNew.cbInstr;
6306	pCurPatchInstrGC += CpuNew.cbInstr;
6307	cbLeft -= CpuNew.cbInstr;
6308
6309	/* Check if we expanded a complex guest instruction into a patch stream (e.g. call) */
6310	if (!cbLeft)
6311	{
6312	/* If the next patch instruction doesn't correspond to the next guest instruction, then we have some extra room to fill. */
6313	if (RTAvlU32Get(&pPatch->patch.Patch2GuestAddrTree, pCurPatchInstrGC - pVM->patm.s.pPatchMemGC) == NULL)
6314	{
6315	pRec = (PRECPATCHTOGUEST)RTAvlU32GetBestFit(&pPatch->patch.Patch2GuestAddrTree, pCurPatchInstrGC - pVM->patm.s.pPatchMemGC, true);
6316	if (pRec)
6317	{
6318	unsigned cbFiller = pRec->Core.Key + pVM->patm.s.pPatchMemGC - pCurPatchInstrGC;
6319	uint8_t *pPatchFillHC = patmPatchGCPtr2PatchHCPtr(pVM, pCurPatchInstrGC);
6320
6321	Assert(!pRec->fDirty);
6322
6323	Log(("Room left in patched instruction stream (%d bytes)\n", cbFiller));
6324	if (cbFiller >= SIZEOF_NEARJUMP32)
6325	{
6326	pPatchFillHC[0] = 0xE9;
6327	(uint32_t )&pPatchFillHC[1] = cbFiller - SIZEOF_NEARJUMP32;
6328	#ifdef DEBUG
6329	char szBuf[256];
6330	DBGFR3DisasInstrEx(pVM->pUVM, pVCpu->idCpu, pCtx->cs.Sel, pCurPatchInstrGC,
6331	DBGF_DISAS_FLAGS_DEFAULT_MODE, szBuf, sizeof(szBuf), NULL);
6332	Log(("FILL: %s\n", szBuf));
6333	#endif
6334	}
6335	else
6336	{
6337	for (unsigned i = 0; i < cbFiller; i++)
6338	{
6339	pPatchFillHC[i] = 0x90; /* NOP */
6340	#ifdef DEBUG
6341	char szBuf[256];
6342	DBGFR3DisasInstrEx(pVM->pUVM, pVCpu->idCpu, pCtx->cs.Sel, pCurPatchInstrGC + i,
6343	DBGF_DISAS_FLAGS_DEFAULT_MODE, szBuf, sizeof(szBuf), NULL);
6344	Log(("FILL: %s\n", szBuf));
6345	#endif
6346	}
6347	}
6348	}
6349	}
6350	}
6351	}
6352	}
6353	else
6354	rc = VERR_PATCHING_REFUSED;
6355
6356	if (RT_SUCCESS(rc))
6357	{
6358	STAM_COUNTER_INC(&pVM->patm.s.StatInstrDirtyGood);
6359	}
6360	else
6361	{
6362	STAM_COUNTER_INC(&pVM->patm.s.StatInstrDirtyBad);
6363	Assert(cbDirty);
6364
6365	/* Mark the whole instruction stream with breakpoints. */
6366	if (cbDirty)
6367	memset(pPatchInstrHC, 0xCC, cbDirty);
6368
6369	if ( pVM->patm.s.fOutOfMemory == false
6370	&& (pPatch->patch.flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_IDTHANDLER\|PATMFL_TRAPHANDLER)))
6371	{
6372	rc = patmR3RefreshPatch(pVM, pPatch);
6373	if (RT_FAILURE(rc))
6374	{
6375	LogRel(("PATM: Failed to refresh dirty patch at %RRv. Disabling it.\n", pPatch->patch.pPrivInstrGC));
6376	}
6377	/* Even if we succeed, we must go back to the original instruction as the patched one could be invalid. */
6378	rc = VERR_PATCHING_REFUSED;
6379	}
6380	}
6381	return rc;
6382	}
6383
6384	/**
6385	* Handle trap inside patch code
6386	*
6387	* @returns VBox status code.
6388	* @param pVM The cross context VM structure.
6389	* @param pCtx Pointer to the guest CPU context.
6390	* @param pEip GC pointer of trapping instruction.
6391	* @param ppNewEip GC pointer to new instruction.
6392	*/
6393	VMMR3_INT_DECL(int) PATMR3HandleTrap(PVM pVM, PCPUMCTX pCtx, RTRCPTR pEip, RTGCPTR *ppNewEip)
6394	{
6395	PPATMPATCHREC pPatch = 0;
6396	void *pvPatchCoreOffset;
6397	RTRCUINTPTR offset;
6398	RTRCPTR pNewEip;
6399	int rc ;
6400	PRECPATCHTOGUEST pPatchToGuestRec = 0;
6401	PVMCPU pVCpu = VMMGetCpu0(pVM);
6402
6403	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
6404	Assert(pVM->cCpus == 1);
6405
6406	pNewEip = 0;
6407	*ppNewEip = 0;
6408
6409	STAM_PROFILE_ADV_START(&pVM->patm.s.StatHandleTrap, a);
6410
6411	/* Find the patch record. */
6412	/* Note: there might not be a patch to guest translation record (global function) */
6413	offset = pEip - pVM->patm.s.pPatchMemGC;
6414	pvPatchCoreOffset = RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, offset, false);
6415	if (pvPatchCoreOffset)
6416	{
6417	pPatch = PATM_PATCHREC_FROM_COREOFFSET(pvPatchCoreOffset);
6418
6419	Assert(offset >= pPatch->patch.pPatchBlockOffset && offset < pPatch->patch.pPatchBlockOffset + pPatch->patch.cbPatchBlockSize);
6420
6421	if (pPatch->patch.uState == PATCH_DIRTY)
6422	{
6423	Log(("PATMR3HandleTrap: trap in dirty patch at %RRv\n", pEip));
6424	if (pPatch->patch.flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_CODE_REFERENCED))
6425	{
6426	/* Function duplication patches set fPIF to 1 on entry */
6427	pVM->patm.s.pGCStateHC->fPIF = 1;
6428	}
6429	}
6430	else
6431	if (pPatch->patch.uState == PATCH_DISABLED)
6432	{
6433	Log(("PATMR3HandleTrap: trap in disabled patch at %RRv\n", pEip));
6434	if (pPatch->patch.flags & (PATMFL_DUPLICATE_FUNCTION\|PATMFL_CODE_REFERENCED))
6435	{
6436	/* Function duplication patches set fPIF to 1 on entry */
6437	pVM->patm.s.pGCStateHC->fPIF = 1;
6438	}
6439	}
6440	else
6441	if (pPatch->patch.uState == PATCH_DISABLE_PENDING)
6442	{
6443	RTRCPTR pPrivInstrGC = pPatch->patch.pPrivInstrGC;
6444
6445	Log(("PATMR3HandleTrap: disable operation is pending for patch at %RRv\n", pPatch->patch.pPrivInstrGC));
6446	rc = PATMR3DisablePatch(pVM, pPatch->patch.pPrivInstrGC);
6447	AssertReleaseMsg(rc != VWRN_PATCH_REMOVED, ("PATMR3DisablePatch removed patch at %RRv\n", pPrivInstrGC));
6448	AssertMsg(pPatch->patch.uState == PATCH_DISABLED \|\| pPatch->patch.uState == PATCH_UNUSABLE, ("Unexpected failure to disable patch state=%d rc=%Rrc\n", pPatch->patch.uState, rc));
6449	}
6450
6451	pPatchToGuestRec = (PRECPATCHTOGUEST)RTAvlU32GetBestFit(&pPatch->patch.Patch2GuestAddrTree, offset, false);
6452	AssertReleaseMsg(pPatchToGuestRec, ("PATMR3HandleTrap: Unable to find corresponding guest address for %RRv (offset %x)\n", pEip, offset));
6453
6454	pNewEip = pPatchToGuestRec->pOrgInstrGC;
6455	pPatch->patch.cTraps++;
6456	PATM_STAT_FAULT_INC(&pPatch->patch);
6457	}
6458	else
6459	AssertReleaseMsg(pVM->patm.s.pGCStateHC->fPIF == 0, ("PATMR3HandleTrap: Unable to find translation record for %RRv (PIF=0)\n", pEip));
6460
6461	/* Check if we were interrupted in PATM generated instruction code. */
6462	if (pVM->patm.s.pGCStateHC->fPIF == 0)
6463	{
6464	DISCPUSTATE Cpu;
6465	rc = CPUMR3DisasmInstrCPU(pVM, pVCpu, pCtx, pEip, &Cpu, "PIF Trap: ");
6466	AssertRC(rc);
6467
6468	if ( rc == VINF_SUCCESS
6469	&& ( Cpu.pCurInstr->uOpcode == OP_PUSHF
6470	\|\| Cpu.pCurInstr->uOpcode == OP_PUSH
6471	\|\| Cpu.pCurInstr->uOpcode == OP_CALL)
6472	)
6473	{
6474	uint64_t fFlags;
6475
6476	STAM_COUNTER_INC(&pVM->patm.s.StatPushTrap);
6477
6478	if (Cpu.pCurInstr->uOpcode == OP_PUSH)
6479	{
6480	rc = PGMShwGetPage(pVCpu, pCtx->esp, &fFlags, NULL);
6481	if ( rc == VINF_SUCCESS
6482	&& ((fFlags & (X86_PTE_P\|X86_PTE_RW)) == (X86_PTE_P\|X86_PTE_RW)) )
6483	{
6484	/* The stack address is fine, so the push argument is a pointer -> emulate this instruction */
6485
6486	/* Reset the PATM stack. */
6487	CTXSUFF(pVM->patm.s.pGCState)->Psp = PATM_STACK_SIZE;
6488
6489	pVM->patm.s.pGCStateHC->fPIF = 1;
6490
6491	Log(("Faulting push -> go back to the original instruction\n"));
6492
6493	/* continue at the original instruction */
6494	*ppNewEip = pNewEip - SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(pCtx), 0);
6495	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6496	return VINF_SUCCESS;
6497	}
6498	}
6499
6500	/* Typical pushf (most patches)/push (call patch) trap because of a monitored page. */
6501	rc = PGMShwMakePageWritable(pVCpu, pCtx->esp, 0 /fFlags/);
6502	AssertMsgRC(rc, ("PGMShwModifyPage -> rc=%Rrc\n", rc));
6503	if (rc == VINF_SUCCESS)
6504	{
6505	/* The guest page must be present. */
6506	rc = PGMGstGetPage(pVCpu, pCtx->esp, &fFlags, NULL);
6507	if ( rc == VINF_SUCCESS
6508	&& (fFlags & X86_PTE_P))
6509	{
6510	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6511	return VINF_PATCH_CONTINUE;
6512	}
6513	}
6514	}
6515	else
6516	if (pPatch->patch.pPrivInstrGC == pNewEip)
6517	{
6518	/* Invalidated patch or first instruction overwritten.
6519	* We can ignore the fPIF state in this case.
6520	*/
6521	/* Reset the PATM stack. */
6522	CTXSUFF(pVM->patm.s.pGCState)->Psp = PATM_STACK_SIZE;
6523
6524	Log(("Call to invalidated patch -> go back to the original instruction\n"));
6525
6526	pVM->patm.s.pGCStateHC->fPIF = 1;
6527
6528	/* continue at the original instruction */
6529	*ppNewEip = pNewEip - SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(pCtx), 0);
6530	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6531	return VINF_SUCCESS;
6532	}
6533
6534	char szBuf[256];
6535	DBGFR3DisasInstrEx(pVM->pUVM, pVCpu->idCpu, pCtx->cs.Sel, pEip, DBGF_DISAS_FLAGS_DEFAULT_MODE, szBuf, sizeof(szBuf), NULL);
6536
6537	/* Very bad. We crashed in emitted code. Probably stack? */
6538	if (pPatch)
6539	{
6540	AssertLogRelMsg(pVM->patm.s.pGCStateHC->fPIF == 1,
6541	("Crash in patch code %RRv (%RRv) esp=%RX32\nPatch state=%x flags=%RX64 fDirty=%d\n%s\n",
6542	pEip, pNewEip, CPUMGetGuestESP(pVCpu), pPatch->patch.uState, pPatch->patch.flags,
6543	pPatchToGuestRec->fDirty, szBuf));
6544	}
6545	else
6546	AssertLogRelMsg(pVM->patm.s.pGCStateHC->fPIF == 1,
6547	("Crash in patch code %RRv (%RRv) esp=%RX32\n%s\n", pEip, pNewEip, CPUMGetGuestESP(pVCpu), szBuf));
6548	EMR3FatalError(pVCpu, VERR_PATM_IPE_TRAP_IN_PATCH_CODE);
6549	}
6550
6551	/* From here on, we must have a valid patch to guest translation. */
6552	if (pvPatchCoreOffset == 0)
6553	{
6554	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6555	AssertMsgFailed(("PATMR3HandleTrap: patch not found at address %RRv!!\n", pEip));
6556	return VERR_PATCH_NOT_FOUND;
6557	}
6558
6559	/* Take care of dirty/changed instructions. */
6560	if (pPatchToGuestRec->fDirty)
6561	{
6562	Assert(pPatchToGuestRec->Core.Key == offset);
6563	Assert(pVM->patm.s.pGCStateHC->fPIF == 1);
6564
6565	rc = patmR3HandleDirtyInstr(pVM, pCtx, pPatch, pPatchToGuestRec, pEip);
6566	if (RT_SUCCESS(rc))
6567	{
6568	/* Retry the current instruction. */
6569	pNewEip = pEip;
6570	rc = VINF_PATCH_CONTINUE; /* Continue at current patch instruction. */
6571	}
6572	else
6573	{
6574	/* Reset the PATM stack. */
6575	CTXSUFF(pVM->patm.s.pGCState)->Psp = PATM_STACK_SIZE;
6576
6577	rc = VINF_SUCCESS; /* Continue at original instruction. */
6578	}
6579
6580	*ppNewEip = pNewEip - SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(pCtx), 0);
6581	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6582	return rc;
6583	}
6584
6585	#ifdef VBOX_STRICT
6586	if (pPatch->patch.flags & PATMFL_DUPLICATE_FUNCTION)
6587	{
6588	DISCPUSTATE cpu;
6589	bool disret;
6590	uint32_t cbInstr;
6591	PATMP2GLOOKUPREC cacheRec;
6592	RT_ZERO(cacheRec);
6593	cacheRec.pPatch = &pPatch->patch;
6594
6595	disret = patmR3DisInstr(pVM, &pPatch->patch, pNewEip, patmR3GCVirtToHCVirt(pVM, &cacheRec, pNewEip), PATMREAD_RAWCODE,
6596	&cpu, &cbInstr);
6597	if (cacheRec.Lock.pvMap)
6598	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
6599
6600	if (disret && cpu.pCurInstr->uOpcode == OP_RETN)
6601	{
6602	RTRCPTR retaddr;
6603	PCPUMCTX pCtx2;
6604
6605	pCtx2 = CPUMQueryGuestCtxPtr(pVCpu);
6606
6607	rc = PGMPhysSimpleReadGCPtr(pVCpu, &retaddr, pCtx2->esp, sizeof(retaddr));
6608	AssertRC(rc);
6609
6610	Log(("Return failed at %RRv (%RRv)\n", pEip, pNewEip));
6611	Log(("Expected return address %RRv found address %RRv Psp=%x\n", pVM->patm.s.pGCStackHC[(pVM->patm.s.pGCStateHC->Psp+PATM_STACK_SIZE)/sizeof(RTRCPTR)], retaddr, pVM->patm.s.pGCStateHC->Psp));
6612	}
6613	}
6614	#endif
6615
6616	/* Return original address, correct by subtracting the CS base address. */
6617	*ppNewEip = pNewEip - SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(pCtx), 0);
6618
6619	/* Reset the PATM stack. */
6620	CTXSUFF(pVM->patm.s.pGCState)->Psp = PATM_STACK_SIZE;
6621
6622	if (pVM->patm.s.pGCStateHC->GCPtrInhibitInterrupts == pNewEip)
6623	{
6624	/* Must be a faulting instruction after sti; currently only sysexit, hlt or iret */
6625	Log(("PATMR3HandleTrap %RRv -> inhibit irqs set!\n", pEip));
6626	#ifdef VBOX_STRICT
6627	DISCPUSTATE cpu;
6628	bool disret;
6629	uint32_t cbInstr;
6630	PATMP2GLOOKUPREC cacheRec;
6631	RT_ZERO(cacheRec);
6632	cacheRec.pPatch = &pPatch->patch;
6633
6634	disret = patmR3DisInstr(pVM, &pPatch->patch, pNewEip, patmR3GCVirtToHCVirt(pVM, &cacheRec, pNewEip), PATMREAD_ORGCODE,
6635	&cpu, &cbInstr);
6636	if (cacheRec.Lock.pvMap)
6637	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
6638
6639	if (disret && (cpu.pCurInstr->uOpcode == OP_SYSEXIT \|\| cpu.pCurInstr->uOpcode == OP_HLT \|\| cpu.pCurInstr->uOpcode == OP_INT3))
6640	{
6641	disret = patmR3DisInstr(pVM, &pPatch->patch, pNewEip, patmR3GCVirtToHCVirt(pVM, &cacheRec, pNewEip), PATMREAD_RAWCODE,
6642	&cpu, &cbInstr);
6643	if (cacheRec.Lock.pvMap)
6644	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
6645
6646	Assert(cpu.pCurInstr->uOpcode == OP_SYSEXIT \|\| cpu.pCurInstr->uOpcode == OP_HLT \|\| cpu.pCurInstr->uOpcode == OP_IRET);
6647	}
6648	#endif
6649	EMSetInhibitInterruptsPC(pVCpu, pNewEip);
6650	pVM->patm.s.pGCStateHC->GCPtrInhibitInterrupts = 0;
6651	}
6652
6653	Log2(("pPatchBlockGC %RRv - pEip %RRv corresponding GC address %RRv\n", PATCHCODE_PTR_GC(&pPatch->patch), pEip, pNewEip));
6654	DBGFR3_DISAS_INSTR_LOG(pVCpu, pCtx->cs.Sel, pNewEip, "PATCHRET: ");
6655	if (pNewEip >= pPatch->patch.pPrivInstrGC && pNewEip < pPatch->patch.pPrivInstrGC + pPatch->patch.cbPatchJump)
6656	{
6657	/* We can't jump back to code that we've overwritten with a 5 byte jump! */
6658	Log(("Disabling patch at location %RRv due to trap too close to the privileged instruction \n", pPatch->patch.pPrivInstrGC));
6659	PATMR3DisablePatch(pVM, pPatch->patch.pPrivInstrGC);
6660	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6661	return VERR_PATCH_DISABLED;
6662	}
6663
6664	#ifdef PATM_REMOVE_PATCH_ON_TOO_MANY_TRAPS
6665	/** @todo compare to nr of successful runs. add some aging algorithm and determine the best time to disable the patch */
6666	if (pPatch->patch.cTraps > MAX_PATCH_TRAPS)
6667	{
6668	Log(("Disabling patch at location %RRv due to too many traps inside patch code\n", pPatch->patch.pPrivInstrGC));
6669	//we are only wasting time, back out the patch
6670	PATMR3DisablePatch(pVM, pPatch->patch.pPrivInstrGC);
6671	pTrapRec->pNextPatchInstr = 0;
6672	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6673	return VERR_PATCH_DISABLED;
6674	}
6675	#endif
6676
6677	STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatHandleTrap, a);
6678	return VINF_SUCCESS;
6679	}
6680
6681
6682	/**
6683	* Handle page-fault in monitored page
6684	*
6685	* @returns VBox status code.
6686	* @param pVM The cross context VM structure.
6687	*/
6688	VMMR3_INT_DECL(int) PATMR3HandleMonitoredPage(PVM pVM)
6689	{
6690	AssertReturn(!HMIsEnabled(pVM), VERR_PATM_HM_IPE);
6691	PVMCPU pVCpu = VMMGetCpu0(pVM);
6692
6693	RTRCPTR addr = pVM->patm.s.pvFaultMonitor;
6694	addr &= PAGE_BASE_GC_MASK;
6695
6696	int rc = PGMHandlerVirtualDeregister(pVM, pVCpu, addr, false /fHypervisor/);
6697	AssertRC(rc); NOREF(rc);
6698
6699	PPATMPATCHREC pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, addr, false);
6700	if (pPatchRec && pPatchRec->patch.uState == PATCH_ENABLED && PAGE_ADDRESS(pPatchRec->patch.pPrivInstrGC) == PAGE_ADDRESS(addr))
6701	{
6702	STAM_COUNTER_INC(&pVM->patm.s.StatMonitored);
6703	Log(("Renewing patch at %RRv\n", pPatchRec->patch.pPrivInstrGC));
6704	rc = PATMR3DisablePatch(pVM, pPatchRec->patch.pPrivInstrGC);
6705	if (rc == VWRN_PATCH_REMOVED)
6706	return VINF_SUCCESS;
6707
6708	PATMR3EnablePatch(pVM, pPatchRec->patch.pPrivInstrGC);
6709
6710	if (addr == pPatchRec->patch.pPrivInstrGC)
6711	addr++;
6712	}
6713
6714	for(;;)
6715	{
6716	pPatchRec = (PPATMPATCHREC)RTAvloU32GetBestFit(&pVM->patm.s.PatchLookupTreeHC->PatchTree, addr, true);
6717
6718	if (!pPatchRec \|\| PAGE_ADDRESS(pPatchRec->patch.pPrivInstrGC) != PAGE_ADDRESS(addr))
6719	break;
6720
6721	if (pPatchRec && pPatchRec->patch.uState == PATCH_ENABLED)
6722	{
6723	STAM_COUNTER_INC(&pVM->patm.s.StatMonitored);
6724	Log(("Renewing patch at %RRv\n", pPatchRec->patch.pPrivInstrGC));
6725	PATMR3DisablePatch(pVM, pPatchRec->patch.pPrivInstrGC);
6726	PATMR3EnablePatch(pVM, pPatchRec->patch.pPrivInstrGC);
6727	}
6728	addr = pPatchRec->patch.pPrivInstrGC + 1;
6729	}
6730
6731	pVM->patm.s.pvFaultMonitor = 0;
6732	return VINF_SUCCESS;
6733	}
6734
6735
6736	#ifdef VBOX_WITH_STATISTICS
6737
6738	static const char *PATMPatchType(PVM pVM, PPATCHINFO pPatch)
6739	{
6740	if (pPatch->flags & PATMFL_SYSENTER)
6741	{
6742	return "SYSENT";
6743	}
6744	else
6745	if (pPatch->flags & (PATMFL_TRAPHANDLER\|PATMFL_INTHANDLER))
6746	{
6747	static char szTrap[16];
6748	uint32_t iGate;
6749
6750	iGate = TRPMR3QueryGateByHandler(pVM, PATCHCODE_PTR_GC(pPatch));
6751	if (iGate < 256)
6752	RTStrPrintf(szTrap, sizeof(szTrap), (pPatch->flags & PATMFL_INTHANDLER) ? "INT-%2X" : "TRAP-%2X", iGate);
6753	else
6754	RTStrPrintf(szTrap, sizeof(szTrap), (pPatch->flags & PATMFL_INTHANDLER) ? "INT-??" : "TRAP-??");
6755	return szTrap;
6756	}
6757	else
6758	if (pPatch->flags & (PATMFL_DUPLICATE_FUNCTION))
6759	return "DUPFUNC";
6760	else
6761	if (pPatch->flags & PATMFL_REPLACE_FUNCTION_CALL)
6762	return "FUNCCALL";
6763	else
6764	if (pPatch->flags & PATMFL_TRAMPOLINE)
6765	return "TRAMP";
6766	else
6767	return patmGetInstructionString(pPatch->opcode, pPatch->flags);
6768	}
6769
6770	static const char *PATMPatchState(PVM pVM, PPATCHINFO pPatch)
6771	{
6772	NOREF(pVM);
6773	switch(pPatch->uState)
6774	{
6775	case PATCH_ENABLED:
6776	return "ENA";
6777	case PATCH_DISABLED:
6778	return "DIS";
6779	case PATCH_DIRTY:
6780	return "DIR";
6781	case PATCH_UNUSABLE:
6782	return "UNU";
6783	case PATCH_REFUSED:
6784	return "REF";
6785	case PATCH_DISABLE_PENDING:
6786	return "DIP";
6787	default:
6788	AssertFailed();
6789	return " ";
6790	}
6791	}
6792
6793	/**
6794	* Resets the sample.
6795	* @param pVM The cross context VM structure.
6796	* @param pvSample The sample registered using STAMR3RegisterCallback.
6797	*/
6798	static void patmResetStat(PVM pVM, void *pvSample)
6799	{
6800	PPATCHINFO pPatch = (PPATCHINFO)pvSample;
6801	Assert(pPatch);
6802
6803	pVM->patm.s.pStatsHC[pPatch->uPatchIdx].u32A = 0;
6804	pVM->patm.s.pStatsHC[pPatch->uPatchIdx].u32B = 0;
6805	}
6806
6807	/**
6808	* Prints the sample into the buffer.
6809	*
6810	* @param pVM The cross context VM structure.
6811	* @param pvSample The sample registered using STAMR3RegisterCallback.
6812	* @param pszBuf The buffer to print into.
6813	* @param cchBuf The size of the buffer.
6814	*/
6815	static void patmPrintStat(PVM pVM, void pvSample, char pszBuf, size_t cchBuf)
6816	{
6817	PPATCHINFO pPatch = (PPATCHINFO)pvSample;
6818	Assert(pPatch);
6819
6820	Assert(pPatch->uState != PATCH_REFUSED);
6821	Assert(!(pPatch->flags & (PATMFL_REPLACE_FUNCTION_CALL\|PATMFL_MMIO_ACCESS)));
6822
6823	RTStrPrintf(pszBuf, cchBuf, "size %04x ->%3s %8s - %08d - %08d",
6824	pPatch->cbPatchBlockSize, PATMPatchState(pVM, pPatch), PATMPatchType(pVM, pPatch),
6825	pVM->patm.s.pStatsHC[pPatch->uPatchIdx].u32A, pVM->patm.s.pStatsHC[pPatch->uPatchIdx].u32B);
6826	}
6827
6828	/**
6829	* Returns the GC address of the corresponding patch statistics counter
6830	*
6831	* @returns Stat address
6832	* @param pVM The cross context VM structure.
6833	* @param pPatch Patch structure
6834	*/
6835	RTRCPTR patmPatchQueryStatAddress(PVM pVM, PPATCHINFO pPatch)
6836	{
6837	Assert(pPatch->uPatchIdx != PATM_STAT_INDEX_NONE);
6838	return pVM->patm.s.pStatsGC + sizeof(STAMRATIOU32) * pPatch->uPatchIdx + RT_OFFSETOF(STAMRATIOU32, u32A);
6839	}
6840
6841	#endif /* VBOX_WITH_STATISTICS */
6842	#ifdef VBOX_WITH_DEBUGGER
6843
6844	/**
6845	* @callback_method_impl{FNDBGCCMD, The '.patmoff' command.}
6846	*/
6847	static DECLCALLBACK(int) patmr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR paArgs, unsigned cArgs)
6848	{
6849	/*
6850	* Validate input.
6851	*/
6852	NOREF(cArgs); NOREF(paArgs);
6853	DBGC_CMDHLP_REQ_UVM_RET(pCmdHlp, pCmd, pUVM);
6854	PVM pVM = pUVM->pVM;
6855	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
6856
6857	if (HMIsEnabled(pVM))
6858	return DBGCCmdHlpPrintf(pCmdHlp, "PATM is permanently disabled by HM.\n");
6859
6860	RTAvloU32DoWithAll(&pVM->patm.s.PatchLookupTreeHC->PatchTree, true, DisableAllPatches, pVM);
6861	PATMR3AllowPatching(pVM->pUVM, false);
6862	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Patching disabled\n");
6863	}
6864
6865	/**
6866	* @callback_method_impl{FNDBGCCMD, The '.patmon' command.}
6867	*/
6868	static DECLCALLBACK(int) patmr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR paArgs, unsigned cArgs)
6869	{
6870	/*
6871	* Validate input.
6872	*/
6873	NOREF(cArgs); NOREF(paArgs);
6874	DBGC_CMDHLP_REQ_UVM_RET(pCmdHlp, pCmd, pUVM);
6875	PVM pVM = pUVM->pVM;
6876	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
6877
6878	if (HMIsEnabled(pVM))
6879	return DBGCCmdHlpPrintf(pCmdHlp, "PATM is permanently disabled by HM.\n");
6880
6881	PATMR3AllowPatching(pVM->pUVM, true);
6882	RTAvloU32DoWithAll(&pVM->patm.s.PatchLookupTreeHC->PatchTree, true, EnableAllPatches, pVM);
6883	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Patching enabled\n");
6884	}
6885
6886	#endif /* VBOX_WITH_DEBUGGER */
6887

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source: vbox/trunk/src/VBox/VMM/VMMR3/PATM.cpp@ 66651

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