PATMA.asm@ 44410

Last change on this file since 44410 was 40007, checked in by vboxsync, 13 years ago
VMMR3/PATMA.asm: moved all patch records to the data section to prevent text relocations in the binary (thanks Mathias Krause!)
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 71.7 KB

Line
1	; $Id: PATMA.asm 40007 2012-02-06 11:16:59Z vboxsync $
2	;; @file
3	; PATM Assembly Routines.
4	;
5
6	; Copyright (C) 2006-2007 Oracle Corporation
7	;
8	; This file is part of VirtualBox Open Source Edition (OSE), as
9	; available from http://www.virtualbox.org. This file is free software;
10	; you can redistribute it and/or modify it under the terms of the GNU
11	; General Public License (GPL) as published by the Free Software
12	; Foundation, in version 2 as it comes in the "COPYING" file of the
13	; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	;
16
17	;;
18	; @note This method has problems in theory. If we fault for any reason, then we won't be able to restore
19	; the guest's context properly!!
20	; E.g if one of the push instructions causes a fault or SS isn't wide open and our patch GC state accesses aren't valid.
21	; @assumptions
22	; - Enough stack for a few pushes
23	; - The SS selector has base 0 and limit 0xffffffff
24	;
25	; @todo stack probing is currently hardcoded and not present everywhere (search for 'probe stack')
26
27
28	;*******************************************************************************
29	;* Header Files *
30	;*******************************************************************************
31	%include "VBox/asmdefs.mac"
32	%include "VBox/err.mac"
33	%include "iprt/x86.mac"
34	%include "VBox/vmm/vm.mac"
35	%include "PATMA.mac"
36
37	%ifdef DEBUG
38	; Noisy, but useful for debugging certain problems
39	;;;%define PATM_LOG_PATCHINSTR
40	;;%define PATM_LOG_PATCHIRET
41	%endif
42
43	BEGINCONST
44
45	%ifdef RT_ARCH_AMD64
46	BITS 32 ; switch to 32-bit mode (x86).
47	%endif
48
49	%ifdef VBOX_WITH_STATISTICS
50	;
51	; Patch call statistics
52	;
53	BEGINPROC PATMStats
54	PATMStats_Start:
55	mov dword [ss:PATM_INTERRUPTFLAG], 0
56	pushf
57	inc dword [ss:PATM_ALLPATCHCALLS]
58	inc dword [ss:PATM_PERPATCHCALLS]
59	popf
60	mov dword [ss:PATM_INTERRUPTFLAG], 1
61	PATMStats_End:
62	ENDPROC PATMStats
63
64
65	; Patch record for statistics
66	GLOBALNAME PATMStatsRecord
67	RTCCPTR_DEF PATMStats_Start
68	DD 0
69	DD 0
70	DD 0
71	DD PATMStats_End - PATMStats_Start
72	DD 4
73	DD PATM_INTERRUPTFLAG
74	DD 0
75	DD PATM_ALLPATCHCALLS
76	DD 0
77	DD PATM_PERPATCHCALLS
78	DD 0
79	DD PATM_INTERRUPTFLAG
80	DD 0
81	DD 0ffffffffh
82	%endif
83
84	;
85	; Set PATM_INTERRUPTFLAG
86	;
87	BEGINPROC PATMSetPIF
88	PATMSetPIF_Start:
89	mov dword [ss:PATM_INTERRUPTFLAG], 1
90	PATMSetPIF_End:
91	ENDPROC PATMSetPIF
92
93
94	SECTION .data
95	; Patch record for setting PATM_INTERRUPTFLAG
96	GLOBALNAME PATMSetPIFRecord
97	RTCCPTR_DEF PATMSetPIF_Start
98	DD 0
99	DD 0
100	DD 0
101	DD PATMSetPIF_End - PATMSetPIF_Start
102	DD 1
103	DD PATM_INTERRUPTFLAG
104	DD 0
105	DD 0ffffffffh
106	SECTION .text
107
108	;
109	; Clear PATM_INTERRUPTFLAG
110	;
111	BEGINPROC PATMClearPIF
112	PATMClearPIF_Start:
113	; probe stack here as we can't recover from page faults later on
114	not dword [esp-64]
115	not dword [esp-64]
116	mov dword [ss:PATM_INTERRUPTFLAG], 0
117	PATMClearPIF_End:
118	ENDPROC PATMClearPIF
119
120
121	SECTION .data
122	; Patch record for clearing PATM_INTERRUPTFLAG
123	GLOBALNAME PATMClearPIFRecord
124	RTCCPTR_DEF PATMClearPIF_Start
125	DD 0
126	DD 0
127	DD 0
128	DD PATMClearPIF_End - PATMClearPIF_Start
129	DD 1
130	DD PATM_INTERRUPTFLAG
131	DD 0
132	DD 0ffffffffh
133	SECTION .text
134
135	;
136	; Clear PATM_INHIBITIRQADDR and fault if IF=0
137	;
138	BEGINPROC PATMClearInhibitIRQFaultIF0
139	PATMClearInhibitIRQFaultIF0_Start:
140	mov dword [ss:PATM_INTERRUPTFLAG], 0
141	mov dword [ss:PATM_INHIBITIRQADDR], 0
142	pushf
143
144	test dword [ss:PATM_VMFLAGS], X86_EFL_IF
145	jz PATMClearInhibitIRQFaultIF0_Fault
146
147	; if interrupts are pending, then we must go back to the host context to handle them!
148	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
149	jz PATMClearInhibitIRQFaultIF0_Continue
150
151	; Go to our hypervisor trap handler to dispatch the pending irq
152	mov dword [ss:PATM_TEMP_EAX], eax
153	mov dword [ss:PATM_TEMP_ECX], ecx
154	mov dword [ss:PATM_TEMP_EDI], edi
155	mov dword [ss:PATM_TEMP_RESTORE_FLAGS], PATM_RESTORE_EAX \| PATM_RESTORE_ECX \| PATM_RESTORE_EDI
156	mov eax, PATM_ACTION_DISPATCH_PENDING_IRQ
157	lock or dword [ss:PATM_PENDINGACTION], eax
158	mov ecx, PATM_ACTION_MAGIC
159	mov edi, PATM_NEXTINSTRADDR
160	popfd ; restore flags we pushed above (the or instruction changes the flags as well)
161	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
162	; does not return
163
164	PATMClearInhibitIRQFaultIF0_Fault:
165	popf
166	mov dword [ss:PATM_INTERRUPTFLAG], 1
167	PATM_INT3
168
169	PATMClearInhibitIRQFaultIF0_Continue:
170	popf
171	mov dword [ss:PATM_INTERRUPTFLAG], 1
172	PATMClearInhibitIRQFaultIF0_End:
173	ENDPROC PATMClearInhibitIRQFaultIF0
174
175
176	SECTION .data
177	; Patch record for clearing PATM_INHIBITIRQADDR
178	GLOBALNAME PATMClearInhibitIRQFaultIF0Record
179	RTCCPTR_DEF PATMClearInhibitIRQFaultIF0_Start
180	DD 0
181	DD 0
182	DD 0
183	DD PATMClearInhibitIRQFaultIF0_End - PATMClearInhibitIRQFaultIF0_Start
184	DD 12
185	DD PATM_INTERRUPTFLAG
186	DD 0
187	DD PATM_INHIBITIRQADDR
188	DD 0
189	DD PATM_VMFLAGS
190	DD 0
191	DD PATM_VM_FORCEDACTIONS
192	DD 0
193	DD PATM_TEMP_EAX
194	DD 0
195	DD PATM_TEMP_ECX
196	DD 0
197	DD PATM_TEMP_EDI
198	DD 0
199	DD PATM_TEMP_RESTORE_FLAGS
200	DD 0
201	DD PATM_PENDINGACTION
202	DD 0
203	DD PATM_NEXTINSTRADDR
204	DD 0
205	DD PATM_INTERRUPTFLAG
206	DD 0
207	DD PATM_INTERRUPTFLAG
208	DD 0
209	DD 0ffffffffh
210	SECTION .text
211
212	;
213	; Clear PATM_INHIBITIRQADDR and continue if IF=0 (duplicated function only; never jump back to guest code afterwards!!)
214	;
215	BEGINPROC PATMClearInhibitIRQContIF0
216	PATMClearInhibitIRQContIF0_Start:
217	mov dword [ss:PATM_INTERRUPTFLAG], 0
218	mov dword [ss:PATM_INHIBITIRQADDR], 0
219	pushf
220
221	test dword [ss:PATM_VMFLAGS], X86_EFL_IF
222	jz PATMClearInhibitIRQContIF0_Continue
223
224	; if interrupts are pending, then we must go back to the host context to handle them!
225	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
226	jz PATMClearInhibitIRQContIF0_Continue
227
228	; Go to our hypervisor trap handler to dispatch the pending irq
229	mov dword [ss:PATM_TEMP_EAX], eax
230	mov dword [ss:PATM_TEMP_ECX], ecx
231	mov dword [ss:PATM_TEMP_EDI], edi
232	mov dword [ss:PATM_TEMP_RESTORE_FLAGS], PATM_RESTORE_EAX \| PATM_RESTORE_ECX \| PATM_RESTORE_EDI
233	mov eax, PATM_ACTION_DISPATCH_PENDING_IRQ
234	lock or dword [ss:PATM_PENDINGACTION], eax
235	mov ecx, PATM_ACTION_MAGIC
236	mov edi, PATM_NEXTINSTRADDR
237	popfd ; restore flags we pushed above (the or instruction changes the flags as well)
238	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
239	; does not return
240
241	PATMClearInhibitIRQContIF0_Continue:
242	popf
243	mov dword [ss:PATM_INTERRUPTFLAG], 1
244	PATMClearInhibitIRQContIF0_End:
245	ENDPROC PATMClearInhibitIRQContIF0
246
247
248	SECTION .data
249	; Patch record for clearing PATM_INHIBITIRQADDR
250	GLOBALNAME PATMClearInhibitIRQContIF0Record
251	RTCCPTR_DEF PATMClearInhibitIRQContIF0_Start
252	DD 0
253	DD 0
254	DD 0
255	DD PATMClearInhibitIRQContIF0_End - PATMClearInhibitIRQContIF0_Start
256	DD 11
257	DD PATM_INTERRUPTFLAG
258	DD 0
259	DD PATM_INHIBITIRQADDR
260	DD 0
261	DD PATM_VMFLAGS
262	DD 0
263	DD PATM_VM_FORCEDACTIONS
264	DD 0
265	DD PATM_TEMP_EAX
266	DD 0
267	DD PATM_TEMP_ECX
268	DD 0
269	DD PATM_TEMP_EDI
270	DD 0
271	DD PATM_TEMP_RESTORE_FLAGS
272	DD 0
273	DD PATM_PENDINGACTION
274	DD 0
275	DD PATM_NEXTINSTRADDR
276	DD 0
277	DD PATM_INTERRUPTFLAG
278	DD 0
279	DD 0ffffffffh
280	SECTION .text
281
282
283	BEGINPROC PATMCliReplacement
284	PATMCliStart:
285	mov dword [ss:PATM_INTERRUPTFLAG], 0
286	pushf
287	%ifdef PATM_LOG_PATCHINSTR
288	push eax
289	push ecx
290	mov eax, PATM_ACTION_LOG_CLI
291	lock or dword [ss:PATM_PENDINGACTION], eax
292	mov ecx, PATM_ACTION_MAGIC
293	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
294	pop ecx
295	pop eax
296	%endif
297
298	and dword [ss:PATM_VMFLAGS], ~X86_EFL_IF
299	popf
300
301	mov dword [ss:PATM_INTERRUPTFLAG], 1
302	DB 0xE9
303	PATMCliJump:
304	DD PATM_JUMPDELTA
305	PATMCliEnd:
306	ENDPROC PATMCliReplacement
307
308
309	SECTION .data
310	; Patch record for 'cli'
311	GLOBALNAME PATMCliRecord
312	RTCCPTR_DEF PATMCliStart
313	DD PATMCliJump - PATMCliStart
314	DD 0
315	DD 0
316	DD PATMCliEnd - PATMCliStart
317	%ifdef PATM_LOG_PATCHINSTR
318	DD 4
319	%else
320	DD 3
321	%endif
322	DD PATM_INTERRUPTFLAG
323	DD 0
324	%ifdef PATM_LOG_PATCHINSTR
325	DD PATM_PENDINGACTION
326	DD 0
327	%endif
328	DD PATM_VMFLAGS
329	DD 0
330	DD PATM_INTERRUPTFLAG
331	DD 0
332	DD 0ffffffffh
333	SECTION .text
334
335
336	BEGINPROC PATMStiReplacement
337	PATMStiStart:
338	mov dword [ss:PATM_INTERRUPTFLAG], 0
339	mov dword [ss:PATM_INHIBITIRQADDR], PATM_NEXTINSTRADDR
340	pushf
341	%ifdef PATM_LOG_PATCHINSTR
342	push eax
343	push ecx
344	mov eax, PATM_ACTION_LOG_STI
345	lock or dword [ss:PATM_PENDINGACTION], eax
346	mov ecx, PATM_ACTION_MAGIC
347	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
348	pop ecx
349	pop eax
350	%endif
351	or dword [ss:PATM_VMFLAGS], X86_EFL_IF
352	popf
353	mov dword [ss:PATM_INTERRUPTFLAG], 1
354	PATMStiEnd:
355	ENDPROC PATMStiReplacement
356
357	SECTION .data
358	; Patch record for 'sti'
359	GLOBALNAME PATMStiRecord
360	RTCCPTR_DEF PATMStiStart
361	DD 0
362	DD 0
363	DD 0
364	DD PATMStiEnd - PATMStiStart
365	%ifdef PATM_LOG_PATCHINSTR
366	DD 6
367	%else
368	DD 5
369	%endif
370	DD PATM_INTERRUPTFLAG
371	DD 0
372	DD PATM_INHIBITIRQADDR
373	DD 0
374	DD PATM_NEXTINSTRADDR
375	DD 0
376	%ifdef PATM_LOG_PATCHINSTR
377	DD PATM_PENDINGACTION
378	DD 0
379	%endif
380	DD PATM_VMFLAGS
381	DD 0
382	DD PATM_INTERRUPTFLAG
383	DD 0
384	DD 0ffffffffh
385	SECTION .text
386
387	;
388	; Trampoline code for trap entry (without error code on the stack)
389	;
390	; esp + 32 - GS (V86 only)
391	; esp + 28 - FS (V86 only)
392	; esp + 24 - DS (V86 only)
393	; esp + 20 - ES (V86 only)
394	; esp + 16 - SS (if transfer to inner ring)
395	; esp + 12 - ESP (if transfer to inner ring)
396	; esp + 8 - EFLAGS
397	; esp + 4 - CS
398	; esp - EIP
399	;
400	BEGINPROC PATMTrapEntry
401	PATMTrapEntryStart:
402	mov dword [ss:PATM_INTERRUPTFLAG], 0
403	pushf
404
405	%ifdef PATM_LOG_PATCHIRET
406	push eax
407	push ecx
408	push edx
409	lea edx, dword [ss:esp+12+4] ;3 dwords + pushed flags -> iret eip
410	mov eax, PATM_ACTION_LOG_GATE_ENTRY
411	lock or dword [ss:PATM_PENDINGACTION], eax
412	mov ecx, PATM_ACTION_MAGIC
413	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
414	pop edx
415	pop ecx
416	pop eax
417	%endif
418
419	test dword [esp+12], X86_EFL_VM
420	jnz PATMTrapNoRing1
421
422	; make sure the saved CS selector for ring 1 is made 0
423	test dword [esp+8], 2
424	jnz PATMTrapNoRing1
425	test dword [esp+8], 1
426	jz PATMTrapNoRing1
427	and dword [esp+8], dword ~1 ; yasm / nasm dword
428	PATMTrapNoRing1:
429
430	; correct EFLAGS on the stack to include the current IOPL
431	push eax
432	mov eax, dword [ss:PATM_VMFLAGS]
433	and eax, X86_EFL_IOPL
434	and dword [esp+16], ~X86_EFL_IOPL ; esp+16 = eflags = esp+8+4(efl)+4(eax)
435	or dword [esp+16], eax
436	pop eax
437
438	popf
439	mov dword [ss:PATM_INTERRUPTFLAG], 1
440	DB 0xE9
441	PATMTrapEntryJump:
442	DD PATM_JUMPDELTA
443	PATMTrapEntryEnd:
444	ENDPROC PATMTrapEntry
445
446
447	SECTION .data
448	; Patch record for trap gate entrypoint
449	GLOBALNAME PATMTrapEntryRecord
450	RTCCPTR_DEF PATMTrapEntryStart
451	DD PATMTrapEntryJump - PATMTrapEntryStart
452	DD 0
453	DD 0
454	DD PATMTrapEntryEnd - PATMTrapEntryStart
455	%ifdef PATM_LOG_PATCHIRET
456	DD 4
457	%else
458	DD 3
459	%endif
460	DD PATM_INTERRUPTFLAG
461	DD 0
462	%ifdef PATM_LOG_PATCHIRET
463	DD PATM_PENDINGACTION
464	DD 0
465	%endif
466	DD PATM_VMFLAGS
467	DD 0
468	DD PATM_INTERRUPTFLAG
469	DD 0
470	DD 0ffffffffh
471	SECTION .text
472
473	;
474	; Trampoline code for trap entry (with error code on the stack)
475	;
476	; esp + 36 - GS (V86 only)
477	; esp + 32 - FS (V86 only)
478	; esp + 28 - DS (V86 only)
479	; esp + 24 - ES (V86 only)
480	; esp + 20 - SS (if transfer to inner ring)
481	; esp + 16 - ESP (if transfer to inner ring)
482	; esp + 12 - EFLAGS
483	; esp + 8 - CS
484	; esp + 4 - EIP
485	; esp - error code
486	;
487	BEGINPROC PATMTrapEntryErrorCode
488	PATMTrapErrorCodeEntryStart:
489	mov dword [ss:PATM_INTERRUPTFLAG], 0
490	pushf
491
492	%ifdef PATM_LOG_PATCHIRET
493	push eax
494	push ecx
495	push edx
496	lea edx, dword [ss:esp+12+4+4] ;3 dwords + pushed flags + error code -> iret eip
497	mov eax, PATM_ACTION_LOG_GATE_ENTRY
498	lock or dword [ss:PATM_PENDINGACTION], eax
499	mov ecx, PATM_ACTION_MAGIC
500	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
501	pop edx
502	pop ecx
503	pop eax
504	%endif
505
506	test dword [esp+16], X86_EFL_VM
507	jnz PATMTrapErrorCodeNoRing1
508
509	; make sure the saved CS selector for ring 1 is made 0
510	test dword [esp+12], 2
511	jnz PATMTrapErrorCodeNoRing1
512	test dword [esp+12], 1
513	jz PATMTrapErrorCodeNoRing1
514	and dword [esp+12], dword ~1 ; yasm / nasm dword
515	PATMTrapErrorCodeNoRing1:
516
517	; correct EFLAGS on the stack to include the current IOPL
518	push eax
519	mov eax, dword [ss:PATM_VMFLAGS]
520	and eax, X86_EFL_IOPL
521	and dword [esp+20], ~X86_EFL_IOPL ; esp+20 = eflags = esp+8+4(efl)+4(error code)+4(eax)
522	or dword [esp+20], eax
523	pop eax
524
525	popf
526	mov dword [ss:PATM_INTERRUPTFLAG], 1
527	DB 0xE9
528	PATMTrapErrorCodeEntryJump:
529	DD PATM_JUMPDELTA
530	PATMTrapErrorCodeEntryEnd:
531	ENDPROC PATMTrapEntryErrorCode
532
533
534	SECTION .data
535	; Patch record for trap gate entrypoint
536	GLOBALNAME PATMTrapEntryRecordErrorCode
537	RTCCPTR_DEF PATMTrapErrorCodeEntryStart
538	DD PATMTrapErrorCodeEntryJump - PATMTrapErrorCodeEntryStart
539	DD 0
540	DD 0
541	DD PATMTrapErrorCodeEntryEnd - PATMTrapErrorCodeEntryStart
542	%ifdef PATM_LOG_PATCHIRET
543	DD 4
544	%else
545	DD 3
546	%endif
547	DD PATM_INTERRUPTFLAG
548	DD 0
549	%ifdef PATM_LOG_PATCHIRET
550	DD PATM_PENDINGACTION
551	DD 0
552	%endif
553	DD PATM_VMFLAGS
554	DD 0
555	DD PATM_INTERRUPTFLAG
556	DD 0
557	DD 0ffffffffh
558	SECTION .text
559
560
561	;
562	; Trampoline code for interrupt gate entry (without error code on the stack)
563	;
564	; esp + 32 - GS (V86 only)
565	; esp + 28 - FS (V86 only)
566	; esp + 24 - DS (V86 only)
567	; esp + 20 - ES (V86 only)
568	; esp + 16 - SS (if transfer to inner ring)
569	; esp + 12 - ESP (if transfer to inner ring)
570	; esp + 8 - EFLAGS
571	; esp + 4 - CS
572	; esp - EIP
573	;
574	BEGINPROC PATMIntEntry
575	PATMIntEntryStart:
576	mov dword [ss:PATM_INTERRUPTFLAG], 0
577	pushf
578
579	%ifdef PATM_LOG_PATCHIRET
580	push eax
581	push ecx
582	push edx
583	lea edx, dword [ss:esp+12+4] ;3 dwords + pushed flags -> iret eip
584	mov eax, PATM_ACTION_LOG_GATE_ENTRY
585	lock or dword [ss:PATM_PENDINGACTION], eax
586	mov ecx, PATM_ACTION_MAGIC
587	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
588	pop edx
589	pop ecx
590	pop eax
591	%endif
592
593	test dword [esp+12], X86_EFL_VM
594	jnz PATMIntNoRing1
595
596	; make sure the saved CS selector for ring 1 is made 0
597	test dword [esp+8], 2
598	jnz PATMIntNoRing1
599	test dword [esp+8], 1
600	jz PATMIntNoRing1
601	and dword [esp+8], dword ~1 ; yasm / nasm dword
602	PATMIntNoRing1:
603
604	; correct EFLAGS on the stack to include the current IOPL
605	push eax
606	mov eax, dword [ss:PATM_VMFLAGS]
607	and eax, X86_EFL_IOPL
608	and dword [esp+16], ~X86_EFL_IOPL ; esp+16 = eflags = esp+8+4(efl)+4(eax)
609	or dword [esp+16], eax
610	pop eax
611
612	popf
613	mov dword [ss:PATM_INTERRUPTFLAG], 1
614	PATMIntEntryEnd:
615	ENDPROC PATMIntEntry
616
617
618	SECTION .data
619	; Patch record for interrupt gate entrypoint
620	GLOBALNAME PATMIntEntryRecord
621	RTCCPTR_DEF PATMIntEntryStart
622	DD 0
623	DD 0
624	DD 0
625	DD PATMIntEntryEnd - PATMIntEntryStart
626	%ifdef PATM_LOG_PATCHIRET
627	DD 4
628	%else
629	DD 3
630	%endif
631	DD PATM_INTERRUPTFLAG
632	DD 0
633	%ifdef PATM_LOG_PATCHIRET
634	DD PATM_PENDINGACTION
635	DD 0
636	%endif
637	DD PATM_VMFLAGS
638	DD 0
639	DD PATM_INTERRUPTFLAG
640	DD 0
641	DD 0ffffffffh
642	SECTION .text
643
644	;
645	; Trampoline code for interrupt gate entry (with error code on the stack)
646	;
647	; esp + 36 - GS (V86 only)
648	; esp + 32 - FS (V86 only)
649	; esp + 28 - DS (V86 only)
650	; esp + 24 - ES (V86 only)
651	; esp + 20 - SS (if transfer to inner ring)
652	; esp + 16 - ESP (if transfer to inner ring)
653	; esp + 12 - EFLAGS
654	; esp + 8 - CS
655	; esp + 4 - EIP
656	; esp - error code
657	;
658	BEGINPROC PATMIntEntryErrorCode
659	PATMIntEntryErrorCodeStart:
660	mov dword [ss:PATM_INTERRUPTFLAG], 0
661	pushf
662
663	%ifdef PATM_LOG_PATCHIRET
664	push eax
665	push ecx
666	push edx
667	lea edx, dword [ss:esp+12+4+4] ;3 dwords + pushed flags + error code -> iret eip
668	mov eax, PATM_ACTION_LOG_GATE_ENTRY
669	lock or dword [ss:PATM_PENDINGACTION], eax
670	mov ecx, PATM_ACTION_MAGIC
671	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
672	pop edx
673	pop ecx
674	pop eax
675	%endif
676
677	test dword [esp+16], X86_EFL_VM
678	jnz PATMIntNoRing1_ErrorCode
679
680	; make sure the saved CS selector for ring 1 is made 0
681	test dword [esp+12], 2
682	jnz PATMIntNoRing1_ErrorCode
683	test dword [esp+12], 1
684	jz PATMIntNoRing1_ErrorCode
685	and dword [esp+12], dword ~1 ; yasm / nasm dword
686	PATMIntNoRing1_ErrorCode:
687
688	; correct EFLAGS on the stack to include the current IOPL
689	push eax
690	mov eax, dword [ss:PATM_VMFLAGS]
691	and eax, X86_EFL_IOPL
692	and dword [esp+20], ~X86_EFL_IOPL ; esp+20 = eflags = esp+8+4(efl)+4(eax)+4(error code)
693	or dword [esp+20], eax
694	pop eax
695
696	popf
697	mov dword [ss:PATM_INTERRUPTFLAG], 1
698	PATMIntEntryErrorCodeEnd:
699	ENDPROC PATMIntEntryErrorCode
700
701
702	SECTION .data
703	; Patch record for interrupt gate entrypoint
704	GLOBALNAME PATMIntEntryRecordErrorCode
705	RTCCPTR_DEF PATMIntEntryErrorCodeStart
706	DD 0
707	DD 0
708	DD 0
709	DD PATMIntEntryErrorCodeEnd - PATMIntEntryErrorCodeStart
710	%ifdef PATM_LOG_PATCHIRET
711	DD 4
712	%else
713	DD 3
714	%endif
715	DD PATM_INTERRUPTFLAG
716	DD 0
717	%ifdef PATM_LOG_PATCHIRET
718	DD PATM_PENDINGACTION
719	DD 0
720	%endif
721	DD PATM_VMFLAGS
722	DD 0
723	DD PATM_INTERRUPTFLAG
724	DD 0
725	DD 0ffffffffh
726	SECTION .text
727
728	;
729	; 32 bits Popf replacement that faults when IF remains 0
730	;
731	BEGINPROC PATMPopf32Replacement
732	PATMPopf32Start:
733	mov dword [ss:PATM_INTERRUPTFLAG], 0
734	%ifdef PATM_LOG_PATCHINSTR
735	push eax
736	push ecx
737	mov eax, PATM_ACTION_LOG_POPF_IF1
738	test dword [esp+8], X86_EFL_IF
739	jnz PATMPopf32_Log
740	mov eax, PATM_ACTION_LOG_POPF_IF0
741
742	PATMPopf32_Log:
743	lock or dword [ss:PATM_PENDINGACTION], eax
744	mov ecx, PATM_ACTION_MAGIC
745	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
746	pop ecx
747	pop eax
748	%endif
749
750	test dword [esp], X86_EFL_IF
751	jnz PATMPopf32_Ok
752	mov dword [ss:PATM_INTERRUPTFLAG], 1
753	PATM_INT3
754
755	PATMPopf32_Ok:
756	; Note: we don't allow popf instructions to change the current IOPL; we simply ignore such changes (!!!)
757	; In this particular patch it's rather unlikely the pushf was included, so we have no way to check if the flags on the stack were correctly synced
758	; PATMPopf32Replacement_NoExit is different, because it's only used in IDT and function patches
759	or dword [ss:PATM_VMFLAGS], X86_EFL_IF
760
761	; if interrupts are pending, then we must go back to the host context to handle them!
762	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
763	jz PATMPopf32_Continue
764
765	; Go to our hypervisor trap handler to dispatch the pending irq
766	mov dword [ss:PATM_TEMP_EAX], eax
767	mov dword [ss:PATM_TEMP_ECX], ecx
768	mov dword [ss:PATM_TEMP_EDI], edi
769	mov dword [ss:PATM_TEMP_RESTORE_FLAGS], PATM_RESTORE_EAX \| PATM_RESTORE_ECX \| PATM_RESTORE_EDI
770	mov eax, PATM_ACTION_DISPATCH_PENDING_IRQ
771	lock or dword [ss:PATM_PENDINGACTION], eax
772	mov ecx, PATM_ACTION_MAGIC
773	mov edi, PATM_NEXTINSTRADDR
774
775	popfd ; restore flags we pushed above (the or instruction changes the flags as well)
776	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
777	; does not return
778
779	PATMPopf32_Continue:
780	popfd ; restore flags we pushed above
781	mov dword [ss:PATM_INTERRUPTFLAG], 1
782	DB 0xE9
783	PATMPopf32Jump:
784	DD PATM_JUMPDELTA
785	PATMPopf32End:
786	ENDPROC PATMPopf32Replacement
787
788
789	SECTION .data
790	; Patch record for 'popfd'
791	GLOBALNAME PATMPopf32Record
792	RTCCPTR_DEF PATMPopf32Start
793	DD PATMPopf32Jump - PATMPopf32Start
794	DD 0
795	DD 0
796	DD PATMPopf32End - PATMPopf32Start
797	%ifdef PATM_LOG_PATCHINSTR
798	DD 12
799	%else
800	DD 11
801	%endif
802	DD PATM_INTERRUPTFLAG
803	DD 0
804	%ifdef PATM_LOG_PATCHINSTR
805	DD PATM_PENDINGACTION
806	DD 0
807	%endif
808	DD PATM_INTERRUPTFLAG
809	DD 0
810	DD PATM_VMFLAGS
811	DD 0
812	DD PATM_VM_FORCEDACTIONS
813	DD 0
814	DD PATM_TEMP_EAX
815	DD 0
816	DD PATM_TEMP_ECX
817	DD 0
818	DD PATM_TEMP_EDI
819	DD 0
820	DD PATM_TEMP_RESTORE_FLAGS
821	DD 0
822	DD PATM_PENDINGACTION
823	DD 0
824	DD PATM_NEXTINSTRADDR
825	DD 0
826	DD PATM_INTERRUPTFLAG
827	DD 0
828	DD 0ffffffffh
829	SECTION .text
830
831	; no need to check the IF flag when popf isn't an exit point of a patch (e.g. function duplication)
832	BEGINPROC PATMPopf32Replacement_NoExit
833	PATMPopf32_NoExitStart:
834	mov dword [ss:PATM_INTERRUPTFLAG], 0
835	%ifdef PATM_LOG_PATCHINSTR
836	push eax
837	push ecx
838	mov eax, PATM_ACTION_LOG_POPF_IF1
839	test dword [esp+8], X86_EFL_IF
840	jnz PATMPopf32_NoExitLog
841	mov eax, PATM_ACTION_LOG_POPF_IF0
842
843	PATMPopf32_NoExitLog:
844	lock or dword [ss:PATM_PENDINGACTION], eax
845	mov ecx, PATM_ACTION_MAGIC
846	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
847	pop ecx
848	pop eax
849	%endif
850	test dword [esp], X86_EFL_IF
851	jz PATMPopf32_NoExit_Continue
852
853	; if interrupts are pending, then we must go back to the host context to handle them!
854	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
855	jz PATMPopf32_NoExit_Continue
856
857	; Go to our hypervisor trap handler to dispatch the pending irq
858	mov dword [ss:PATM_TEMP_EAX], eax
859	mov dword [ss:PATM_TEMP_ECX], ecx
860	mov dword [ss:PATM_TEMP_EDI], edi
861	mov dword [ss:PATM_TEMP_RESTORE_FLAGS], PATM_RESTORE_EAX \| PATM_RESTORE_ECX \| PATM_RESTORE_EDI
862	mov eax, PATM_ACTION_DISPATCH_PENDING_IRQ
863	lock or dword [ss:PATM_PENDINGACTION], eax
864	mov ecx, PATM_ACTION_MAGIC
865	mov edi, PATM_NEXTINSTRADDR
866
867	pop dword [ss:PATM_VMFLAGS] ; restore flags now (the or instruction changes the flags as well)
868	push dword [ss:PATM_VMFLAGS]
869	popfd
870
871	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
872	; does not return
873
874	PATMPopf32_NoExit_Continue:
875	pop dword [ss:PATM_VMFLAGS]
876	push dword [ss:PATM_VMFLAGS]
877	popfd
878	mov dword [ss:PATM_INTERRUPTFLAG], 1
879	PATMPopf32_NoExitEnd:
880	ENDPROC PATMPopf32Replacement_NoExit
881
882
883	SECTION .data
884	; Patch record for 'popfd'
885	GLOBALNAME PATMPopf32Record_NoExit
886	RTCCPTR_DEF PATMPopf32_NoExitStart
887	DD 0
888	DD 0
889	DD 0
890	DD PATMPopf32_NoExitEnd - PATMPopf32_NoExitStart
891	%ifdef PATM_LOG_PATCHINSTR
892	DD 14
893	%else
894	DD 13
895	%endif
896	DD PATM_INTERRUPTFLAG
897	DD 0
898	%ifdef PATM_LOG_PATCHINSTR
899	DD PATM_PENDINGACTION
900	DD 0
901	%endif
902	DD PATM_VM_FORCEDACTIONS
903	DD 0
904	DD PATM_TEMP_EAX
905	DD 0
906	DD PATM_TEMP_ECX
907	DD 0
908	DD PATM_TEMP_EDI
909	DD 0
910	DD PATM_TEMP_RESTORE_FLAGS
911	DD 0
912	DD PATM_PENDINGACTION
913	DD 0
914	DD PATM_NEXTINSTRADDR
915	DD 0
916	DD PATM_VMFLAGS
917	DD 0
918	DD PATM_VMFLAGS
919	DD 0
920	DD PATM_VMFLAGS
921	DD 0
922	DD PATM_VMFLAGS
923	DD 0
924	DD PATM_INTERRUPTFLAG
925	DD 0
926	DD 0ffffffffh
927	SECTION .text
928
929
930	;
931	; 16 bits Popf replacement that faults when IF remains 0
932	;
933	BEGINPROC PATMPopf16Replacement
934	PATMPopf16Start:
935	mov dword [ss:PATM_INTERRUPTFLAG], 0
936	test word [esp], X86_EFL_IF
937	jnz PATMPopf16_Ok
938	mov dword [ss:PATM_INTERRUPTFLAG], 1
939	PATM_INT3
940
941	PATMPopf16_Ok:
942	; if interrupts are pending, then we must go back to the host context to handle them!
943	; @note we destroy the flags here, but that should really not matter (PATM_INT3 case)
944	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
945	jz PATMPopf16_Continue
946	mov dword [ss:PATM_INTERRUPTFLAG], 1
947	PATM_INT3
948
949	PATMPopf16_Continue:
950
951	pop word [ss:PATM_VMFLAGS]
952	push word [ss:PATM_VMFLAGS]
953	and dword [ss:PATM_VMFLAGS], PATM_VIRTUAL_FLAGS_MASK
954	or dword [ss:PATM_VMFLAGS], PATM_VIRTUAL_FLAGS_MASK
955
956	DB 0x66 ; size override
957	popf ;after the and and or operations!! (flags must be preserved)
958	mov dword [ss:PATM_INTERRUPTFLAG], 1
959
960	DB 0xE9
961	PATMPopf16Jump:
962	DD PATM_JUMPDELTA
963	PATMPopf16End:
964	ENDPROC PATMPopf16Replacement
965
966
967	SECTION .data
968	; Patch record for 'popf'
969	GLOBALNAME PATMPopf16Record
970	RTCCPTR_DEF PATMPopf16Start
971	DD PATMPopf16Jump - PATMPopf16Start
972	DD 0
973	DD 0
974	DD PATMPopf16End - PATMPopf16Start
975	DD 9
976	DD PATM_INTERRUPTFLAG
977	DD 0
978	DD PATM_INTERRUPTFLAG
979	DD 0
980	DD PATM_VM_FORCEDACTIONS
981	DD 0
982	DD PATM_INTERRUPTFLAG
983	DD 0
984	DD PATM_VMFLAGS
985	DD 0
986	DD PATM_VMFLAGS
987	DD 0
988	DD PATM_VMFLAGS
989	DD 0
990	DD PATM_VMFLAGS
991	DD 0
992	DD PATM_INTERRUPTFLAG
993	DD 0
994	DD 0ffffffffh
995	SECTION .text
996
997	;
998	; 16 bits Popf replacement that faults when IF remains 0
999	; @todo not necessary to fault in that case (see 32 bits version)
1000	BEGINPROC PATMPopf16Replacement_NoExit
1001	PATMPopf16Start_NoExit:
1002	mov dword [ss:PATM_INTERRUPTFLAG], 0
1003	test word [esp], X86_EFL_IF
1004	jnz PATMPopf16_Ok_NoExit
1005	mov dword [ss:PATM_INTERRUPTFLAG], 1
1006	PATM_INT3
1007
1008	PATMPopf16_Ok_NoExit:
1009	; if interrupts are pending, then we must go back to the host context to handle them!
1010	; @note we destroy the flags here, but that should really not matter (PATM_INT3 case)
1011	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
1012	jz PATMPopf16_Continue_NoExit
1013	mov dword [ss:PATM_INTERRUPTFLAG], 1
1014	PATM_INT3
1015
1016	PATMPopf16_Continue_NoExit:
1017
1018	pop word [ss:PATM_VMFLAGS]
1019	push word [ss:PATM_VMFLAGS]
1020	and dword [ss:PATM_VMFLAGS], PATM_VIRTUAL_FLAGS_MASK
1021	or dword [ss:PATM_VMFLAGS], PATM_VIRTUAL_FLAGS_MASK
1022
1023	DB 0x66 ; size override
1024	popf ;after the and and or operations!! (flags must be preserved)
1025	mov dword [ss:PATM_INTERRUPTFLAG], 1
1026	PATMPopf16End_NoExit:
1027	ENDPROC PATMPopf16Replacement_NoExit
1028
1029
1030	SECTION .data
1031	; Patch record for 'popf'
1032	GLOBALNAME PATMPopf16Record_NoExit
1033	RTCCPTR_DEF PATMPopf16Start_NoExit
1034	DD 0
1035	DD 0
1036	DD 0
1037	DD PATMPopf16End_NoExit - PATMPopf16Start_NoExit
1038	DD 9
1039	DD PATM_INTERRUPTFLAG
1040	DD 0
1041	DD PATM_INTERRUPTFLAG
1042	DD 0
1043	DD PATM_VM_FORCEDACTIONS
1044	DD 0
1045	DD PATM_INTERRUPTFLAG
1046	DD 0
1047	DD PATM_VMFLAGS
1048	DD 0
1049	DD PATM_VMFLAGS
1050	DD 0
1051	DD PATM_VMFLAGS
1052	DD 0
1053	DD PATM_VMFLAGS
1054	DD 0
1055	DD PATM_INTERRUPTFLAG
1056	DD 0
1057	DD 0ffffffffh
1058	SECTION .text
1059
1060
1061	BEGINPROC PATMPushf32Replacement
1062	PATMPushf32Start:
1063	mov dword [ss:PATM_INTERRUPTFLAG], 0
1064	pushfd
1065	%ifdef PATM_LOG_PATCHINSTR
1066	push eax
1067	push ecx
1068	mov eax, PATM_ACTION_LOG_PUSHF
1069	lock or dword [ss:PATM_PENDINGACTION], eax
1070	mov ecx, PATM_ACTION_MAGIC
1071	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1072	pop ecx
1073	pop eax
1074	%endif
1075
1076	pushfd
1077	push eax
1078	mov eax, dword [esp+8]
1079	and eax, PATM_FLAGS_MASK
1080	or eax, dword [ss:PATM_VMFLAGS]
1081	mov dword [esp+8], eax
1082	pop eax
1083	popfd
1084	mov dword [ss:PATM_INTERRUPTFLAG], 1
1085	PATMPushf32End:
1086	ENDPROC PATMPushf32Replacement
1087
1088
1089	SECTION .data
1090	; Patch record for 'pushfd'
1091	GLOBALNAME PATMPushf32Record
1092	RTCCPTR_DEF PATMPushf32Start
1093	DD 0
1094	DD 0
1095	DD 0
1096	DD PATMPushf32End - PATMPushf32Start
1097	%ifdef PATM_LOG_PATCHINSTR
1098	DD 4
1099	%else
1100	DD 3
1101	%endif
1102	DD PATM_INTERRUPTFLAG
1103	DD 0
1104	%ifdef PATM_LOG_PATCHINSTR
1105	DD PATM_PENDINGACTION
1106	DD 0
1107	%endif
1108	DD PATM_VMFLAGS
1109	DD 0
1110	DD PATM_INTERRUPTFLAG
1111	DD 0
1112	DD 0ffffffffh
1113	SECTION .text
1114
1115
1116	BEGINPROC PATMPushf16Replacement
1117	PATMPushf16Start:
1118	mov dword [ss:PATM_INTERRUPTFLAG], 0
1119	DB 0x66 ; size override
1120	pushf
1121	DB 0x66 ; size override
1122	pushf
1123	push eax
1124	xor eax, eax
1125	mov ax, word [esp+6]
1126	and eax, PATM_FLAGS_MASK
1127	or eax, dword [ss:PATM_VMFLAGS]
1128	mov word [esp+6], ax
1129	pop eax
1130
1131	DB 0x66 ; size override
1132	popf
1133	mov dword [ss:PATM_INTERRUPTFLAG], 1
1134	PATMPushf16End:
1135	ENDPROC PATMPushf16Replacement
1136
1137
1138	SECTION .data
1139	; Patch record for 'pushf'
1140	GLOBALNAME PATMPushf16Record
1141	RTCCPTR_DEF PATMPushf16Start
1142	DD 0
1143	DD 0
1144	DD 0
1145	DD PATMPushf16End - PATMPushf16Start
1146	DD 3
1147	DD PATM_INTERRUPTFLAG
1148	DD 0
1149	DD PATM_VMFLAGS
1150	DD 0
1151	DD PATM_INTERRUPTFLAG
1152	DD 0
1153	DD 0ffffffffh
1154	SECTION .text
1155
1156
1157	BEGINPROC PATMPushCSReplacement
1158	PATMPushCSStart:
1159	mov dword [ss:PATM_INTERRUPTFLAG], 0
1160	push cs
1161	pushfd
1162
1163	test dword [esp+4], 2
1164	jnz pushcs_notring1
1165
1166	; change dpl from 1 to 0
1167	and dword [esp+4], dword ~1 ; yasm / nasm dword
1168
1169	pushcs_notring1:
1170	popfd
1171
1172	mov dword [ss:PATM_INTERRUPTFLAG], 1
1173	DB 0xE9
1174	PATMPushCSJump:
1175	DD PATM_JUMPDELTA
1176	PATMPushCSEnd:
1177	ENDPROC PATMPushCSReplacement
1178
1179
1180	SECTION .data
1181	; Patch record for 'push cs'
1182	GLOBALNAME PATMPushCSRecord
1183	RTCCPTR_DEF PATMPushCSStart
1184	DD PATMPushCSJump - PATMPushCSStart
1185	DD 0
1186	DD 0
1187	DD PATMPushCSEnd - PATMPushCSStart
1188	DD 2
1189	DD PATM_INTERRUPTFLAG
1190	DD 0
1191	DD PATM_INTERRUPTFLAG
1192	DD 0
1193	DD 0ffffffffh
1194	SECTION .text
1195
1196	;;****************************************************
1197	;; Abstract:
1198	;;
1199	;; if eflags.NT==0 && iretstack.eflags.VM==0 && iretstack.eflags.IOPL==0
1200	;; then
1201	;; if return to ring 0 (iretstack.new_cs & 3 == 0)
1202	;; then
1203	;; if iretstack.new_eflags.IF == 1 && iretstack.new_eflags.IOPL == 0
1204	;; then
1205	;; iretstack.new_cs \|= 1
1206	;; else
1207	;; int 3
1208	;; endif
1209	;; uVMFlags &= ~X86_EFL_IF
1210	;; iret
1211	;; else
1212	;; int 3
1213	;;****************************************************
1214	;;
1215	; Stack:
1216	;
1217	; esp + 32 - GS (V86 only)
1218	; esp + 28 - FS (V86 only)
1219	; esp + 24 - DS (V86 only)
1220	; esp + 20 - ES (V86 only)
1221	; esp + 16 - SS (if transfer to outer ring)
1222	; esp + 12 - ESP (if transfer to outer ring)
1223	; esp + 8 - EFLAGS
1224	; esp + 4 - CS
1225	; esp - EIP
1226	;;
1227	BEGINPROC PATMIretReplacement
1228	PATMIretStart:
1229	mov dword [ss:PATM_INTERRUPTFLAG], 0
1230	pushfd
1231
1232	%ifdef PATM_LOG_PATCHIRET
1233	push eax
1234	push ecx
1235	push edx
1236	lea edx, dword [ss:esp+12+4] ;3 dwords + pushed flags -> iret eip
1237	mov eax, PATM_ACTION_LOG_IRET
1238	lock or dword [ss:PATM_PENDINGACTION], eax
1239	mov ecx, PATM_ACTION_MAGIC
1240	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1241	pop edx
1242	pop ecx
1243	pop eax
1244	%endif
1245
1246	test dword [esp], X86_EFL_NT
1247	jnz near iret_fault1
1248
1249	; we can't do an iret to v86 code, as we run with CPL=1. The iret would attempt a protected mode iret and (most likely) fault.
1250	test dword [esp+12], X86_EFL_VM
1251	jnz near iret_return_to_v86
1252
1253	;;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1254	;;@todo: not correct for iret back to ring 2!!!!!
1255	;;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1256
1257	test dword [esp+8], 2
1258	jnz iret_notring0
1259
1260	test dword [esp+12], X86_EFL_IF
1261	jz near iret_clearIF
1262
1263	; force ring 1 CS RPL
1264	or dword [esp+8], 1
1265	iret_notring0:
1266
1267	; if interrupts are pending, then we must go back to the host context to handle them!
1268	; Note: This is very important as pending pic interrupts can be overridden by apic interrupts if we don't check early enough (Fedora 5 boot)
1269	; @@todo fix this properly, so we can dispatch pending interrupts in GC
1270	test dword [ss:PATM_VM_FORCEDACTIONS], VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC
1271	jz iret_continue
1272
1273	; Go to our hypervisor trap handler to dispatch the pending irq
1274	mov dword [ss:PATM_TEMP_EAX], eax
1275	mov dword [ss:PATM_TEMP_ECX], ecx
1276	mov dword [ss:PATM_TEMP_EDI], edi
1277	mov dword [ss:PATM_TEMP_RESTORE_FLAGS], PATM_RESTORE_EAX \| PATM_RESTORE_ECX \| PATM_RESTORE_EDI
1278	mov eax, PATM_ACTION_PENDING_IRQ_AFTER_IRET
1279	lock or dword [ss:PATM_PENDINGACTION], eax
1280	mov ecx, PATM_ACTION_MAGIC
1281	mov edi, PATM_CURINSTRADDR
1282
1283	popfd
1284	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1285	; does not return
1286
1287	iret_continue :
1288	; This section must always be executed (!!)
1289	; Extract the IOPL from the return flags, save them to our virtual flags and
1290	; put them back to zero
1291	; @note we assume iretd doesn't fault!!!
1292	push eax
1293	mov eax, dword [esp+16]
1294	and eax, X86_EFL_IOPL
1295	and dword [ss:PATM_VMFLAGS], ~X86_EFL_IOPL
1296	or dword [ss:PATM_VMFLAGS], eax
1297	pop eax
1298	and dword [esp+12], ~X86_EFL_IOPL
1299
1300	; Set IF again; below we make sure this won't cause problems.
1301	or dword [ss:PATM_VMFLAGS], X86_EFL_IF
1302
1303	; make sure iret is executed fully (including the iret below; cli ... iret can otherwise be interrupted)
1304	mov dword [ss:PATM_INHIBITIRQADDR], PATM_CURINSTRADDR
1305
1306	popfd
1307	mov dword [ss:PATM_INTERRUPTFLAG], 1
1308	iretd
1309	PATM_INT3
1310
1311	iret_fault:
1312	popfd
1313	mov dword [ss:PATM_INTERRUPTFLAG], 1
1314	PATM_INT3
1315
1316	iret_fault1:
1317	nop
1318	popfd
1319	mov dword [ss:PATM_INTERRUPTFLAG], 1
1320	PATM_INT3
1321
1322	iret_clearIF:
1323	push dword [esp+4] ; eip to return to
1324	pushfd
1325	push eax
1326	push PATM_FIXUP
1327	DB 0E8h ; call
1328	DD PATM_IRET_FUNCTION
1329	add esp, 4 ; pushed address of jump table
1330
1331	cmp eax, 0
1332	je near iret_fault3
1333
1334	mov dword [esp+12+4], eax ; stored eip in iret frame
1335	pop eax
1336	popfd
1337	add esp, 4 ; pushed eip
1338
1339	; always ring 0 return -> change to ring 1 (CS in iret frame)
1340	or dword [esp+8], 1
1341
1342	; This section must always be executed (!!)
1343	; Extract the IOPL from the return flags, save them to our virtual flags and
1344	; put them back to zero
1345	push eax
1346	mov eax, dword [esp+16]
1347	and eax, X86_EFL_IOPL
1348	and dword [ss:PATM_VMFLAGS], ~X86_EFL_IOPL
1349	or dword [ss:PATM_VMFLAGS], eax
1350	pop eax
1351	and dword [esp+12], ~X86_EFL_IOPL
1352
1353	; Clear IF
1354	and dword [ss:PATM_VMFLAGS], ~X86_EFL_IF
1355	popfd
1356
1357	; the patched destination code will set PATM_INTERRUPTFLAG after the return!
1358	iretd
1359
1360	iret_return_to_v86:
1361	test dword [esp+12], X86_EFL_IF
1362	jz iret_fault
1363
1364	; Go to our hypervisor trap handler to perform the iret to v86 code
1365	mov dword [ss:PATM_TEMP_EAX], eax
1366	mov dword [ss:PATM_TEMP_ECX], ecx
1367	mov dword [ss:PATM_TEMP_RESTORE_FLAGS], PATM_RESTORE_EAX \| PATM_RESTORE_ECX
1368	mov eax, PATM_ACTION_DO_V86_IRET
1369	lock or dword [ss:PATM_PENDINGACTION], eax
1370	mov ecx, PATM_ACTION_MAGIC
1371
1372	popfd
1373
1374	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1375	; does not return
1376
1377
1378	iret_fault3:
1379	pop eax
1380	popfd
1381	add esp, 4 ; pushed eip
1382	jmp iret_fault
1383
1384	align 4
1385	PATMIretTable:
1386	DW PATM_MAX_JUMPTABLE_ENTRIES ; nrSlots
1387	DW 0 ; ulInsertPos
1388	DD 0 ; cAddresses
1389	TIMES PATCHJUMPTABLE_SIZE DB 0 ; lookup slots
1390
1391	PATMIretEnd:
1392	ENDPROC PATMIretReplacement
1393
1394	SECTION .data
1395	; Patch record for 'iretd'
1396	GLOBALNAME PATMIretRecord
1397	RTCCPTR_DEF PATMIretStart
1398	DD 0
1399	DD 0
1400	DD 0
1401	DD PATMIretEnd- PATMIretStart
1402	%ifdef PATM_LOG_PATCHIRET
1403	DD 26
1404	%else
1405	DD 25
1406	%endif
1407	DD PATM_INTERRUPTFLAG
1408	DD 0
1409	%ifdef PATM_LOG_PATCHIRET
1410	DD PATM_PENDINGACTION
1411	DD 0
1412	%endif
1413	DD PATM_VM_FORCEDACTIONS
1414	DD 0
1415	DD PATM_TEMP_EAX
1416	DD 0
1417	DD PATM_TEMP_ECX
1418	DD 0
1419	DD PATM_TEMP_EDI
1420	DD 0
1421	DD PATM_TEMP_RESTORE_FLAGS
1422	DD 0
1423	DD PATM_PENDINGACTION
1424	DD 0
1425	DD PATM_CURINSTRADDR
1426	DD 0
1427	DD PATM_VMFLAGS
1428	DD 0
1429	DD PATM_VMFLAGS
1430	DD 0
1431	DD PATM_VMFLAGS
1432	DD 0
1433	DD PATM_INHIBITIRQADDR
1434	DD 0
1435	DD PATM_CURINSTRADDR
1436	DD 0
1437	DD PATM_INTERRUPTFLAG
1438	DD 0
1439	DD PATM_INTERRUPTFLAG
1440	DD 0
1441	DD PATM_INTERRUPTFLAG
1442	DD 0
1443	DD PATM_FIXUP
1444	DD PATMIretTable - PATMIretStart
1445	DD PATM_IRET_FUNCTION
1446	DD 0
1447	DD PATM_VMFLAGS
1448	DD 0
1449	DD PATM_VMFLAGS
1450	DD 0
1451	DD PATM_VMFLAGS
1452	DD 0
1453	DD PATM_TEMP_EAX
1454	DD 0
1455	DD PATM_TEMP_ECX
1456	DD 0
1457	DD PATM_TEMP_RESTORE_FLAGS
1458	DD 0
1459	DD PATM_PENDINGACTION
1460	DD 0
1461	DD 0ffffffffh
1462	SECTION .text
1463
1464
1465	;
1466	; global function for implementing 'iret' to code with IF cleared
1467	;
1468	; Caller is responsible for right stack layout
1469	; + 16 original return address
1470	; + 12 eflags
1471	; + 8 eax
1472	; + 4 Jump table address
1473	;( + 0 return address )
1474	;
1475	; @note assumes PATM_INTERRUPTFLAG is zero
1476	; @note assumes it can trash eax and eflags
1477	;
1478	; @returns eax=0 on failure
1479	; otherwise return address in eax
1480	;
1481	; @note NEVER change this without bumping the SSM version
1482	align 32
1483	BEGINPROC PATMIretFunction
1484	PATMIretFunction_Start:
1485	push ecx
1486	push edx
1487	push edi
1488
1489	; Event order:
1490	; 1) Check if the return patch address can be found in the lookup table
1491	; 2) Query return patch address from the hypervisor
1492
1493	; 1) Check if the return patch address can be found in the lookup table
1494	mov edx, dword [esp+12+16] ; pushed target address
1495
1496	xor eax, eax ; default result -> nothing found
1497	mov edi, dword [esp+12+4] ; jump table
1498	mov ecx, [ss:edi + PATCHJUMPTABLE.cAddresses]
1499	cmp ecx, 0
1500	je near PATMIretFunction_AskHypervisor
1501
1502	PATMIretFunction_SearchStart:
1503	cmp [ss:edi + PATCHJUMPTABLE.Slot_pInstrGC + eax*8], edx ; edx = GC address to search for
1504	je near PATMIretFunction_SearchHit
1505	inc eax
1506	cmp eax, ecx
1507	jl near PATMIretFunction_SearchStart
1508
1509	PATMIretFunction_AskHypervisor:
1510	; 2) Query return patch address from the hypervisor
1511	; @todo private ugly interface, since we have nothing generic at the moment
1512	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOOKUP_ADDRESS
1513	mov eax, PATM_ACTION_LOOKUP_ADDRESS
1514	mov ecx, PATM_ACTION_MAGIC
1515	mov edi, dword [esp+12+4] ; jump table address
1516	mov edx, dword [esp+12+16] ; original return address
1517	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1518	jmp near PATMIretFunction_SearchEnd
1519
1520	PATMIretFunction_SearchHit:
1521	mov eax, [ss:edi + PATCHJUMPTABLE.Slot_pRelPatchGC + eax*8] ; found a match!
1522	;@note can be zero, so the next check is required!!
1523
1524	PATMIretFunction_SearchEnd:
1525	cmp eax, 0
1526	jz PATMIretFunction_Failure
1527
1528	add eax, PATM_PATCHBASE
1529
1530	pop edi
1531	pop edx
1532	pop ecx
1533	ret
1534
1535	PATMIretFunction_Failure:
1536	;signal error
1537	xor eax, eax
1538	pop edi
1539	pop edx
1540	pop ecx
1541	ret
1542
1543	PATMIretFunction_End:
1544	ENDPROC PATMIretFunction
1545
1546	SECTION .data
1547	GLOBALNAME PATMIretFunctionRecord
1548	RTCCPTR_DEF PATMIretFunction_Start
1549	DD 0
1550	DD 0
1551	DD 0
1552	DD PATMIretFunction_End - PATMIretFunction_Start
1553	DD 2
1554	DD PATM_PENDINGACTION
1555	DD 0
1556	DD PATM_PATCHBASE
1557	DD 0
1558	DD 0ffffffffh
1559	SECTION .text
1560
1561
1562	align 32 ; yasm / nasm diff - remove me!
1563	BEGINPROC PATMCpuidReplacement
1564	PATMCpuidStart:
1565	mov dword [ss:PATM_INTERRUPTFLAG], 0
1566	pushf
1567
1568	cmp eax, PATM_CPUID_STD_MAX
1569	jb cpuid_std
1570	cmp eax, 0x80000000
1571	jb cpuid_def
1572	cmp eax, PATM_CPUID_EXT_MAX
1573	jb cpuid_ext
1574	cmp eax, 0xc0000000
1575	jb cpuid_def
1576	cmp eax, PATM_CPUID_CENTAUR_MAX
1577	jb cpuid_centaur
1578
1579	; Dirty assumptions in patmCorrectFixup about the pointer fixup order!!!!
1580	cpuid_def:
1581	mov eax, PATM_CPUID_DEF_PTR
1582	jmp cpuid_fetch
1583
1584	cpuid_std:
1585	mov edx, PATM_CPUID_STD_PTR
1586	jmp cpuid_calc
1587
1588	cpuid_ext:
1589	and eax, 0ffh ; strictly speaking not necessary.
1590	mov edx, PATM_CPUID_EXT_PTR
1591	jmp cpuid_calc
1592
1593	cpuid_centaur:
1594	and eax, 0ffh ; strictly speaking not necessary.
1595	mov edx, PATM_CPUID_CENTAUR_PTR
1596
1597	cpuid_calc:
1598	lea eax, [ss:eax * 4] ; 4 entries...
1599	lea eax, [ss:eax * 4] ; 4 bytes each
1600	add eax, edx
1601
1602	cpuid_fetch:
1603	mov edx, [ss:eax + 12] ; CPUMCPUID layout assumptions!
1604	mov ecx, [ss:eax + 8]
1605	mov ebx, [ss:eax + 4]
1606	mov eax, [ss:eax]
1607
1608	popf
1609	mov dword [ss:PATM_INTERRUPTFLAG], 1
1610
1611	PATMCpuidEnd:
1612	ENDPROC PATMCpuidReplacement
1613
1614	SECTION .data
1615	; Patch record for 'cpuid'
1616	GLOBALNAME PATMCpuidRecord
1617	RTCCPTR_DEF PATMCpuidStart
1618	DD 0
1619	DD 0
1620	DD 0
1621	DD PATMCpuidEnd- PATMCpuidStart
1622	DD 9
1623	DD PATM_INTERRUPTFLAG
1624	DD 0
1625	DD PATM_CPUID_STD_MAX
1626	DD 0
1627	DD PATM_CPUID_EXT_MAX
1628	DD 0
1629	DD PATM_CPUID_CENTAUR_MAX
1630	DD 0
1631	DD PATM_CPUID_DEF_PTR
1632	DD 0
1633	DD PATM_CPUID_STD_PTR
1634	DD 0
1635	DD PATM_CPUID_EXT_PTR
1636	DD 0
1637	DD PATM_CPUID_CENTAUR_PTR
1638	DD 0
1639	DD PATM_INTERRUPTFLAG
1640	DD 0
1641	DD 0ffffffffh
1642	SECTION .text
1643
1644
1645	BEGINPROC PATMJEcxReplacement
1646	PATMJEcxStart:
1647	mov dword [ss:PATM_INTERRUPTFLAG], 0
1648	pushfd
1649	PATMJEcxSizeOverride:
1650	DB 0x90 ; nop
1651	cmp ecx, dword 0 ; yasm / nasm dword
1652	jnz PATMJEcxContinue
1653
1654	popfd
1655	mov dword [ss:PATM_INTERRUPTFLAG], 1
1656	DB 0xE9
1657	PATMJEcxJump:
1658	DD PATM_JUMPDELTA
1659
1660	PATMJEcxContinue:
1661	popfd
1662	mov dword [ss:PATM_INTERRUPTFLAG], 1
1663	PATMJEcxEnd:
1664	ENDPROC PATMJEcxReplacement
1665
1666	SECTION .data
1667	; Patch record for 'JEcx'
1668	GLOBALNAME PATMJEcxRecord
1669	RTCCPTR_DEF PATMJEcxStart
1670	DD 0
1671	DD PATMJEcxJump - PATMJEcxStart
1672	DD PATMJEcxSizeOverride - PATMJEcxStart
1673	DD PATMJEcxEnd- PATMJEcxStart
1674	DD 3
1675	DD PATM_INTERRUPTFLAG
1676	DD 0
1677	DD PATM_INTERRUPTFLAG
1678	DD 0
1679	DD PATM_INTERRUPTFLAG
1680	DD 0
1681	DD 0ffffffffh
1682	SECTION .text
1683
1684	align 32; yasm / nasm diffing. remove me!
1685	BEGINPROC PATMLoopReplacement
1686	PATMLoopStart:
1687	mov dword [ss:PATM_INTERRUPTFLAG], 0
1688	pushfd
1689	PATMLoopSizeOverride:
1690	DB 0x90 ; nop
1691	dec ecx
1692	jz PATMLoopContinue
1693
1694	popfd
1695	mov dword [ss:PATM_INTERRUPTFLAG], 1
1696	DB 0xE9
1697	PATMLoopJump:
1698	DD PATM_JUMPDELTA
1699
1700	PATMLoopContinue:
1701	popfd
1702	mov dword [ss:PATM_INTERRUPTFLAG], 1
1703	PATMLoopEnd:
1704	ENDPROC PATMLoopReplacement
1705
1706	SECTION .data
1707	; Patch record for 'Loop'
1708	GLOBALNAME PATMLoopRecord
1709	RTCCPTR_DEF PATMLoopStart
1710	DD 0
1711	DD PATMLoopJump - PATMLoopStart
1712	DD PATMLoopSizeOverride - PATMLoopStart
1713	DD PATMLoopEnd- PATMLoopStart
1714	DD 3
1715	DD PATM_INTERRUPTFLAG
1716	DD 0
1717	DD PATM_INTERRUPTFLAG
1718	DD 0
1719	DD PATM_INTERRUPTFLAG
1720	DD 0
1721	DD 0ffffffffh
1722	SECTION .text
1723
1724	BEGINPROC PATMLoopZReplacement
1725	PATMLoopZStart:
1726	; jump if ZF=1 AND (E)CX != 0
1727
1728	mov dword [ss:PATM_INTERRUPTFLAG], 0
1729	jnz PATMLoopZEnd
1730	pushfd
1731	PATMLoopZSizeOverride:
1732	DB 0x90 ; nop
1733	dec ecx
1734	jz PATMLoopZContinue
1735
1736	popfd
1737	mov dword [ss:PATM_INTERRUPTFLAG], 1
1738	DB 0xE9
1739	PATMLoopZJump:
1740	DD PATM_JUMPDELTA
1741
1742	PATMLoopZContinue:
1743	popfd
1744	mov dword [ss:PATM_INTERRUPTFLAG], 1
1745	PATMLoopZEnd:
1746	ENDPROC PATMLoopZReplacement
1747
1748	SECTION .data
1749	; Patch record for 'Loopz'
1750	GLOBALNAME PATMLoopZRecord
1751	RTCCPTR_DEF PATMLoopZStart
1752	DD 0
1753	DD PATMLoopZJump - PATMLoopZStart
1754	DD PATMLoopZSizeOverride - PATMLoopZStart
1755	DD PATMLoopZEnd- PATMLoopZStart
1756	DD 3
1757	DD PATM_INTERRUPTFLAG
1758	DD 0
1759	DD PATM_INTERRUPTFLAG
1760	DD 0
1761	DD PATM_INTERRUPTFLAG
1762	DD 0
1763	DD 0ffffffffh
1764	SECTION .text
1765
1766
1767	BEGINPROC PATMLoopNZReplacement
1768	PATMLoopNZStart:
1769	; jump if ZF=0 AND (E)CX != 0
1770
1771	mov dword [ss:PATM_INTERRUPTFLAG], 0
1772	jz PATMLoopNZEnd
1773	pushfd
1774	PATMLoopNZSizeOverride:
1775	DB 0x90 ; nop
1776	dec ecx
1777	jz PATMLoopNZContinue
1778
1779	popfd
1780	mov dword [ss:PATM_INTERRUPTFLAG], 1
1781	DB 0xE9
1782	PATMLoopNZJump:
1783	DD PATM_JUMPDELTA
1784
1785	PATMLoopNZContinue:
1786	popfd
1787	mov dword [ss:PATM_INTERRUPTFLAG], 1
1788	PATMLoopNZEnd:
1789	ENDPROC PATMLoopNZReplacement
1790
1791	SECTION .data
1792	; Patch record for 'LoopNZ'
1793	GLOBALNAME PATMLoopNZRecord
1794	RTCCPTR_DEF PATMLoopNZStart
1795	DD 0
1796	DD PATMLoopNZJump - PATMLoopNZStart
1797	DD PATMLoopNZSizeOverride - PATMLoopNZStart
1798	DD PATMLoopNZEnd- PATMLoopNZStart
1799	DD 3
1800	DD PATM_INTERRUPTFLAG
1801	DD 0
1802	DD PATM_INTERRUPTFLAG
1803	DD 0
1804	DD PATM_INTERRUPTFLAG
1805	DD 0
1806	DD 0ffffffffh
1807	SECTION .text
1808
1809	align 32
1810	; Global patch function for indirect calls
1811	; Caller is responsible for clearing PATM_INTERRUPTFLAG and doing:
1812	; + 20 push [pTargetGC]
1813	; + 16 pushfd
1814	; + 12 push [JumpTableAddress]
1815	; + 8 push [PATMRelReturnAddress]
1816	; + 4 push [GuestReturnAddress]
1817	;( + 0 return address )
1818	;
1819	; @note NEVER change this without bumping the SSM version
1820	BEGINPROC PATMLookupAndCall
1821	PATMLookupAndCallStart:
1822	push eax
1823	push edx
1824	push edi
1825	push ecx
1826
1827	mov eax, dword [esp+16+4] ; guest return address
1828	mov dword [ss:PATM_CALL_RETURN_ADDR], eax ; temporary storage
1829
1830	mov edx, dword [esp+16+20] ; pushed target address
1831
1832	xor eax, eax ; default result -> nothing found
1833	mov edi, dword [esp+16+12] ; jump table
1834	mov ecx, [ss:edi + PATCHJUMPTABLE.cAddresses]
1835	cmp ecx, 0
1836	je near PATMLookupAndCall_QueryPATM
1837
1838	PATMLookupAndCall_SearchStart:
1839	cmp [ss:edi + PATCHJUMPTABLE.Slot_pInstrGC + eax*8], edx ; edx = GC address to search for
1840	je near PATMLookupAndCall_SearchHit
1841	inc eax
1842	cmp eax, ecx
1843	jl near PATMLookupAndCall_SearchStart
1844
1845	PATMLookupAndCall_QueryPATM:
1846	; nothing found -> let our trap handler try to find it
1847	; @todo private ugly interface, since we have nothing generic at the moment
1848	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOOKUP_ADDRESS
1849	mov eax, PATM_ACTION_LOOKUP_ADDRESS
1850	mov ecx, PATM_ACTION_MAGIC
1851	; edx = GC address to find
1852	; edi = jump table address
1853	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1854
1855	jmp near PATMLookupAndCall_SearchEnd
1856
1857	PATMLookupAndCall_Failure:
1858	; return to caller; it must raise an error, due to patch to guest address translation (remember that there's only one copy of this code block).
1859	pop ecx
1860	pop edi
1861	pop edx
1862	pop eax
1863	ret
1864
1865	PATMLookupAndCall_SearchHit:
1866	mov eax, [ss:edi + PATCHJUMPTABLE.Slot_pRelPatchGC + eax*8] ; found a match!
1867
1868	;@note can be zero, so the next check is required!!
1869
1870	PATMLookupAndCall_SearchEnd:
1871	cmp eax, 0
1872	je near PATMLookupAndCall_Failure
1873
1874	mov ecx, eax ; ECX = target address (relative!)
1875	add ecx, PATM_PATCHBASE ; Make it absolute
1876
1877	mov edx, dword PATM_STACKPTR
1878	cmp dword [ss:edx], PATM_STACK_SIZE
1879	ja near PATMLookupAndCall_Failure ; should never happen actually!!!
1880	cmp dword [ss:edx], 0
1881	je near PATMLookupAndCall_Failure ; no more room
1882
1883	; save the patch return address on our private stack
1884	sub dword [ss:edx], 4 ; sizeof(RTGCPTR)
1885	mov eax, dword PATM_STACKBASE
1886	add eax, dword [ss:edx] ; stack base + stack position
1887	mov edi, dword [esp+16+8] ; PATM return address
1888	mov dword [ss:eax], edi ; relative address of patch return (instruction following this block)
1889
1890	; save the original return address as well (checked by ret to make sure the guest hasn't messed around with the stack)
1891	mov edi, dword PATM_STACKBASE_GUEST
1892	add edi, dword [ss:edx] ; stack base (guest) + stack position
1893	mov eax, dword [esp+16+4] ; guest return address
1894	mov dword [ss:edi], eax
1895
1896	mov dword [ss:PATM_CALL_PATCH_TARGET_ADDR], ecx ; temporarily store the target address
1897	pop ecx
1898	pop edi
1899	pop edx
1900	pop eax
1901	add esp, 24 ; parameters + return address pushed by caller (changes the flags, but that shouldn't matter)
1902
1903	%ifdef PATM_LOG_PATCHINSTR
1904	push eax
1905	push ecx
1906	push edx
1907	lea edx, [esp + 12 - 4] ; stack address to store return address
1908	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOG_CALL
1909	mov eax, PATM_ACTION_LOG_CALL
1910	mov ecx, PATM_ACTION_MAGIC
1911	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
1912	pop edx
1913	pop ecx
1914	pop eax
1915	%endif
1916
1917	push dword [ss:PATM_CALL_RETURN_ADDR] ; push original guest return address
1918
1919	; the called function will set PATM_INTERRUPTFLAG (!!)
1920	jmp dword [ss:PATM_CALL_PATCH_TARGET_ADDR]
1921
1922	PATMLookupAndCallEnd:
1923	; returning here -> do not add code here or after the jmp!!!!!
1924	ENDPROC PATMLookupAndCall
1925
1926	SECTION .data
1927	; Patch record for indirect calls and jumps
1928	GLOBALNAME PATMLookupAndCallRecord
1929	RTCCPTR_DEF PATMLookupAndCallStart
1930	DD 0
1931	DD 0
1932	DD 0
1933	DD PATMLookupAndCallEnd - PATMLookupAndCallStart
1934	%ifdef PATM_LOG_PATCHINSTR
1935	DD 10
1936	%else
1937	DD 9
1938	%endif
1939	DD PATM_CALL_RETURN_ADDR
1940	DD 0
1941	DD PATM_PENDINGACTION
1942	DD 0
1943	DD PATM_PATCHBASE
1944	DD 0
1945	DD PATM_STACKPTR
1946	DD 0
1947	DD PATM_STACKBASE
1948	DD 0
1949	DD PATM_STACKBASE_GUEST
1950	DD 0
1951	DD PATM_CALL_PATCH_TARGET_ADDR
1952	DD 0
1953	%ifdef PATM_LOG_PATCHINSTR
1954	DD PATM_PENDINGACTION
1955	DD 0
1956	%endif
1957	DD PATM_CALL_RETURN_ADDR
1958	DD 0
1959	DD PATM_CALL_PATCH_TARGET_ADDR
1960	DD 0
1961	DD 0ffffffffh
1962	SECTION .text
1963
1964
1965	align 32
1966	; Global patch function for indirect jumps
1967	; Caller is responsible for clearing PATM_INTERRUPTFLAG and doing:
1968	; + 8 push [pTargetGC]
1969	; + 4 push [JumpTableAddress]
1970	;( + 0 return address )
1971	; And saving eflags in PATM_TEMP_EFLAGS
1972	;
1973	; @note NEVER change this without bumping the SSM version
1974	BEGINPROC PATMLookupAndJump
1975	PATMLookupAndJumpStart:
1976	push eax
1977	push edx
1978	push edi
1979	push ecx
1980
1981	mov edx, dword [esp+16+8] ; pushed target address
1982
1983	xor eax, eax ; default result -> nothing found
1984	mov edi, dword [esp+16+4] ; jump table
1985	mov ecx, [ss:edi + PATCHJUMPTABLE.cAddresses]
1986	cmp ecx, 0
1987	je near PATMLookupAndJump_QueryPATM
1988
1989	PATMLookupAndJump_SearchStart:
1990	cmp [ss:edi + PATCHJUMPTABLE.Slot_pInstrGC + eax*8], edx ; edx = GC address to search for
1991	je near PATMLookupAndJump_SearchHit
1992	inc eax
1993	cmp eax, ecx
1994	jl near PATMLookupAndJump_SearchStart
1995
1996	PATMLookupAndJump_QueryPATM:
1997	; nothing found -> let our trap handler try to find it
1998	; @todo private ugly interface, since we have nothing generic at the moment
1999	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOOKUP_ADDRESS
2000	mov eax, PATM_ACTION_LOOKUP_ADDRESS
2001	mov ecx, PATM_ACTION_MAGIC
2002	; edx = GC address to find
2003	; edi = jump table address
2004	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
2005
2006	jmp near PATMLookupAndJump_SearchEnd
2007
2008	PATMLookupAndJump_Failure:
2009	; return to caller; it must raise an error, due to patch to guest address translation (remember that there's only one copy of this code block).
2010	pop ecx
2011	pop edi
2012	pop edx
2013	pop eax
2014	ret
2015
2016	PATMLookupAndJump_SearchHit:
2017	mov eax, [ss:edi + PATCHJUMPTABLE.Slot_pRelPatchGC + eax*8] ; found a match!
2018
2019	;@note can be zero, so the next check is required!!
2020
2021	PATMLookupAndJump_SearchEnd:
2022	cmp eax, 0
2023	je near PATMLookupAndJump_Failure
2024
2025	mov ecx, eax ; ECX = target address (relative!)
2026	add ecx, PATM_PATCHBASE ; Make it absolute
2027
2028	; save jump patch target
2029	mov dword [ss:PATM_TEMP_EAX], ecx
2030	pop ecx
2031	pop edi
2032	pop edx
2033	pop eax
2034	add esp, 12 ; parameters + return address pushed by caller
2035	; restore flags (just to be sure)
2036	push dword [ss:PATM_TEMP_EFLAGS]
2037	popfd
2038
2039	; the jump destination will set PATM_INTERRUPTFLAG (!!)
2040	jmp dword [ss:PATM_TEMP_EAX] ; call duplicated patch destination address
2041
2042	PATMLookupAndJumpEnd:
2043	ENDPROC PATMLookupAndJump
2044
2045	SECTION .data
2046	; Patch record for indirect calls and jumps
2047	GLOBALNAME PATMLookupAndJumpRecord
2048	RTCCPTR_DEF PATMLookupAndJumpStart
2049	DD 0
2050	DD 0
2051	DD 0
2052	DD PATMLookupAndJumpEnd - PATMLookupAndJumpStart
2053	DD 5
2054	DD PATM_PENDINGACTION
2055	DD 0
2056	DD PATM_PATCHBASE
2057	DD 0
2058	DD PATM_TEMP_EAX
2059	DD 0
2060	DD PATM_TEMP_EFLAGS
2061	DD 0
2062	DD PATM_TEMP_EAX
2063	DD 0
2064	DD 0ffffffffh
2065	SECTION .text
2066
2067
2068
2069
2070	align 32
2071	; Patch function for static calls
2072	; @note static calls have only one lookup slot!
2073	; Caller is responsible for clearing PATM_INTERRUPTFLAG and adding:
2074	; push [pTargetGC]
2075	;
2076	BEGINPROC PATMCall
2077	PATMCallStart:
2078	pushfd
2079	push PATM_FIXUP ; fixup for jump table below
2080	push PATM_PATCHNEXTBLOCK
2081	push PATM_RETURNADDR
2082	DB 0E8h ; call
2083	DD PATM_LOOKUP_AND_CALL_FUNCTION
2084	; we only return in case of a failure
2085	add esp, 12 ; pushed address of jump table
2086	popfd
2087	add esp, 4 ; pushed by caller (changes the flags, but that shouldn't matter (@todo))
2088	mov dword [ss:PATM_INTERRUPTFLAG], 1
2089	PATM_INT3
2090	%ifdef DEBUG
2091	; for disassembly
2092	jmp PATMCallEnd
2093	%endif
2094
2095	align 4
2096	PATMCallTable:
2097	DW 1 ; nrSlots
2098	DW 0 ; ulInsertPos
2099	DD 0 ; cAddresses
2100	TIMES PATCHDIRECTJUMPTABLE_SIZE DB 0 ; only one lookup slot
2101
2102	PATMCallEnd:
2103	; returning here -> do not add code here or after the jmp!!!!!
2104	ENDPROC PATMCall
2105
2106	SECTION .data
2107	; Patch record for direct calls
2108	GLOBALNAME PATMCallRecord
2109	RTCCPTR_DEF PATMCallStart
2110	DD 0
2111	DD 0
2112	DD 0
2113	DD PATMCallEnd - PATMCallStart
2114	DD 5
2115	DD PATM_FIXUP
2116	DD PATMCallTable - PATMCallStart
2117	DD PATM_PATCHNEXTBLOCK
2118	DD 0
2119	DD PATM_RETURNADDR
2120	DD 0
2121	DD PATM_LOOKUP_AND_CALL_FUNCTION
2122	DD 0
2123	DD PATM_INTERRUPTFLAG
2124	DD 0
2125	DD 0ffffffffh
2126	SECTION .text
2127
2128
2129	align 32
2130	; Patch function for indirect calls
2131	; Caller is responsible for clearing PATM_INTERRUPTFLAG and adding:
2132	; push [pTargetGC]
2133	;
2134	BEGINPROC PATMCallIndirect
2135	PATMCallIndirectStart:
2136	pushfd
2137	push PATM_FIXUP ; fixup for jump table below
2138	push PATM_PATCHNEXTBLOCK
2139	push PATM_RETURNADDR
2140	DB 0E8h ; call
2141	DD PATM_LOOKUP_AND_CALL_FUNCTION
2142	; we only return in case of a failure
2143	add esp, 12 ; pushed address of jump table
2144	popfd
2145	add esp, 4 ; pushed by caller (changes the flags, but that shouldn't matter (@todo))
2146	mov dword [ss:PATM_INTERRUPTFLAG], 1
2147	PATM_INT3
2148	%ifdef DEBUG
2149	; for disassembly
2150	jmp PATMCallIndirectEnd
2151	%endif
2152
2153	align 4
2154	PATMCallIndirectTable:
2155	DW PATM_MAX_JUMPTABLE_ENTRIES ; nrSlots
2156	DW 0 ; ulInsertPos
2157	DD 0 ; cAddresses
2158	TIMES PATCHJUMPTABLE_SIZE DB 0 ; lookup slots
2159
2160	PATMCallIndirectEnd:
2161	; returning here -> do not add code here or after the jmp!!!!!
2162	ENDPROC PATMCallIndirect
2163
2164	SECTION .data
2165	; Patch record for indirect calls
2166	GLOBALNAME PATMCallIndirectRecord
2167	RTCCPTR_DEF PATMCallIndirectStart
2168	DD 0
2169	DD 0
2170	DD 0
2171	DD PATMCallIndirectEnd - PATMCallIndirectStart
2172	DD 5
2173	DD PATM_FIXUP
2174	DD PATMCallIndirectTable - PATMCallIndirectStart
2175	DD PATM_PATCHNEXTBLOCK
2176	DD 0
2177	DD PATM_RETURNADDR
2178	DD 0
2179	DD PATM_LOOKUP_AND_CALL_FUNCTION
2180	DD 0
2181	DD PATM_INTERRUPTFLAG
2182	DD 0
2183	DD 0ffffffffh
2184	SECTION .text
2185
2186
2187	align 32
2188	; Patch function for indirect jumps
2189	; Caller is responsible for clearing PATM_INTERRUPTFLAG and adding:
2190	; push [pTargetGC]
2191	;
2192	BEGINPROC PATMJumpIndirect
2193	PATMJumpIndirectStart:
2194	; save flags (just to be sure)
2195	pushfd
2196	pop dword [ss:PATM_TEMP_EFLAGS]
2197
2198	push PATM_FIXUP ; fixup for jump table below
2199	DB 0E8h ; call
2200	DD PATM_LOOKUP_AND_JUMP_FUNCTION
2201	; we only return in case of a failure
2202	add esp, 8 ; pushed address of jump table + pushed target address
2203
2204	; restore flags (just to be sure)
2205	push dword [ss:PATM_TEMP_EFLAGS]
2206	popfd
2207
2208	mov dword [ss:PATM_INTERRUPTFLAG], 1
2209	PATM_INT3
2210
2211	%ifdef DEBUG
2212	; for disassembly
2213	jmp PATMJumpIndirectEnd
2214	%endif
2215
2216	align 4
2217	PATMJumpIndirectTable:
2218	DW PATM_MAX_JUMPTABLE_ENTRIES ; nrSlots
2219	DW 0 ; ulInsertPos
2220	DD 0 ; cAddresses
2221	TIMES PATCHJUMPTABLE_SIZE DB 0 ; lookup slots
2222
2223	PATMJumpIndirectEnd:
2224	; returning here -> do not add code here or after the jmp!!!!!
2225	ENDPROC PATMJumpIndirect
2226
2227	SECTION .data
2228	; Patch record for indirect jumps
2229	GLOBALNAME PATMJumpIndirectRecord
2230	RTCCPTR_DEF PATMJumpIndirectStart
2231	DD 0
2232	DD 0
2233	DD 0
2234	DD PATMJumpIndirectEnd - PATMJumpIndirectStart
2235	DD 5
2236	DD PATM_TEMP_EFLAGS
2237	DD 0
2238	DD PATM_FIXUP
2239	DD PATMJumpIndirectTable - PATMJumpIndirectStart
2240	DD PATM_LOOKUP_AND_JUMP_FUNCTION
2241	DD 0
2242	DD PATM_TEMP_EFLAGS
2243	DD 0
2244	DD PATM_INTERRUPTFLAG
2245	DD 0
2246	DD 0ffffffffh
2247	SECTION .text
2248
2249	;
2250	; return from duplicated function
2251	;
2252	align 32
2253	BEGINPROC PATMRet
2254	PATMRet_Start:
2255	; probe stack here as we can't recover from page faults later on
2256	not dword [esp-32]
2257	not dword [esp-32]
2258	mov dword [ss:PATM_INTERRUPTFLAG], 0
2259	pushfd
2260	push eax
2261	push PATM_FIXUP
2262	DB 0E8h ; call
2263	DD PATM_RETURN_FUNCTION
2264	add esp, 4 ; pushed address of jump table
2265
2266	cmp eax, 0
2267	jne near PATMRet_Success
2268
2269	pop eax
2270	popfd
2271	mov dword [ss:PATM_INTERRUPTFLAG], 1
2272	PATM_INT3
2273
2274	%ifdef DEBUG
2275	; for disassembly
2276	jmp PATMRet_Success
2277	%endif
2278	align 4
2279	PATMRetTable:
2280	DW PATM_MAX_JUMPTABLE_ENTRIES ; nrSlots
2281	DW 0 ; ulInsertPos
2282	DD 0 ; cAddresses
2283	TIMES PATCHJUMPTABLE_SIZE DB 0 ; lookup slots
2284
2285	PATMRet_Success:
2286	mov dword [esp+8], eax ; overwrite the saved return address
2287	pop eax
2288	popf
2289	; caller will duplicate the ret or ret n instruction
2290	; the patched call will set PATM_INTERRUPTFLAG after the return!
2291	PATMRet_End:
2292	ENDPROC PATMRet
2293
2294	SECTION .data
2295	GLOBALNAME PATMRetRecord
2296	RTCCPTR_DEF PATMRet_Start
2297	DD 0
2298	DD 0
2299	DD 0
2300	DD PATMRet_End - PATMRet_Start
2301	DD 4
2302	DD PATM_INTERRUPTFLAG
2303	DD 0
2304	DD PATM_FIXUP
2305	DD PATMRetTable - PATMRet_Start
2306	DD PATM_RETURN_FUNCTION
2307	DD 0
2308	DD PATM_INTERRUPTFLAG
2309	DD 0
2310	DD 0ffffffffh
2311	SECTION .text
2312
2313	;
2314	; global function for implementing 'retn'
2315	;
2316	; Caller is responsible for right stack layout
2317	; + 16 original return address
2318	; + 12 eflags
2319	; + 8 eax
2320	; + 4 Jump table address
2321	;( + 0 return address )
2322	;
2323	; @note assumes PATM_INTERRUPTFLAG is zero
2324	; @note assumes it can trash eax and eflags
2325	;
2326	; @returns eax=0 on failure
2327	; otherwise return address in eax
2328	;
2329	; @note NEVER change this without bumping the SSM version
2330	align 32
2331	BEGINPROC PATMRetFunction
2332	PATMRetFunction_Start:
2333	push ecx
2334	push edx
2335	push edi
2336
2337	; Event order:
2338	; (@todo figure out which path is taken most often (1 or 2))
2339	; 1) Check if the return patch address was pushed onto the PATM stack
2340	; 2) Check if the return patch address can be found in the lookup table
2341	; 3) Query return patch address from the hypervisor
2342
2343
2344	; 1) Check if the return patch address was pushed on the PATM stack
2345	cmp dword [ss:PATM_STACKPTR], PATM_STACK_SIZE
2346	jae near PATMRetFunction_FindReturnAddress
2347
2348	mov edx, dword PATM_STACKPTR
2349
2350	; check if the return address is what we expect it to be
2351	mov eax, dword PATM_STACKBASE_GUEST
2352	add eax, dword [ss:edx] ; stack base + stack position
2353	mov eax, dword [ss:eax] ; original return address
2354	cmp eax, dword [esp+12+16] ; pushed return address
2355
2356	; the return address was changed -> let our trap handler try to find it
2357	; (can happen when the guest messes with the stack (seen it) or when we didn't call this function ourselves)
2358	jne near PATMRetFunction_FindReturnAddress
2359
2360	; found it, convert relative to absolute patch address and return the result to the caller
2361	mov eax, dword PATM_STACKBASE
2362	add eax, dword [ss:edx] ; stack base + stack position
2363	mov eax, dword [ss:eax] ; relative patm return address
2364	add eax, PATM_PATCHBASE
2365
2366	%ifdef PATM_LOG_PATCHINSTR
2367	push eax
2368	push ebx
2369	push ecx
2370	push edx
2371	mov edx, eax ; return address
2372	lea ebx, [esp+16+12+16] ; stack address containing the return address
2373	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOG_RET
2374	mov eax, PATM_ACTION_LOG_RET
2375	mov ecx, PATM_ACTION_MAGIC
2376	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
2377	pop edx
2378	pop ecx
2379	pop ebx
2380	pop eax
2381	%endif
2382
2383	add dword [ss:edx], 4 ; pop return address from the PATM stack (sizeof(RTGCPTR); @note hardcoded assumption!)
2384
2385	pop edi
2386	pop edx
2387	pop ecx
2388	ret
2389
2390	PATMRetFunction_FindReturnAddress:
2391	; 2) Check if the return patch address can be found in the lookup table
2392	mov edx, dword [esp+12+16] ; pushed target address
2393
2394	xor eax, eax ; default result -> nothing found
2395	mov edi, dword [esp+12+4] ; jump table
2396	mov ecx, [ss:edi + PATCHJUMPTABLE.cAddresses]
2397	cmp ecx, 0
2398	je near PATMRetFunction_AskHypervisor
2399
2400	PATMRetFunction_SearchStart:
2401	cmp [ss:edi + PATCHJUMPTABLE.Slot_pInstrGC + eax*8], edx ; edx = GC address to search for
2402	je near PATMRetFunction_SearchHit
2403	inc eax
2404	cmp eax, ecx
2405	jl near PATMRetFunction_SearchStart
2406
2407	PATMRetFunction_AskHypervisor:
2408	; 3) Query return patch address from the hypervisor
2409	; @todo private ugly interface, since we have nothing generic at the moment
2410	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOOKUP_ADDRESS
2411	mov eax, PATM_ACTION_LOOKUP_ADDRESS
2412	mov ecx, PATM_ACTION_MAGIC
2413	mov edi, dword [esp+12+4] ; jump table address
2414	mov edx, dword [esp+12+16] ; original return address
2415	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
2416	jmp near PATMRetFunction_SearchEnd
2417
2418	PATMRetFunction_SearchHit:
2419	mov eax, [ss:edi + PATCHJUMPTABLE.Slot_pRelPatchGC + eax*8] ; found a match!
2420	;@note can be zero, so the next check is required!!
2421
2422	PATMRetFunction_SearchEnd:
2423	cmp eax, 0
2424	jz PATMRetFunction_Failure
2425
2426	add eax, PATM_PATCHBASE
2427
2428	%ifdef PATM_LOG_PATCHINSTR
2429	push eax
2430	push ebx
2431	push ecx
2432	push edx
2433	mov edx, eax ; return address
2434	lea ebx, [esp+16+12+16] ; stack address containing the return address
2435	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOG_RET
2436	mov eax, PATM_ACTION_LOG_RET
2437	mov ecx, PATM_ACTION_MAGIC
2438	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
2439	pop edx
2440	pop ecx
2441	pop ebx
2442	pop eax
2443	%endif
2444
2445	pop edi
2446	pop edx
2447	pop ecx
2448	ret
2449
2450	PATMRetFunction_Failure:
2451	;signal error
2452	xor eax, eax
2453	pop edi
2454	pop edx
2455	pop ecx
2456	ret
2457
2458	PATMRetFunction_End:
2459	ENDPROC PATMRetFunction
2460
2461	SECTION .data
2462	GLOBALNAME PATMRetFunctionRecord
2463	RTCCPTR_DEF PATMRetFunction_Start
2464	DD 0
2465	DD 0
2466	DD 0
2467	DD PATMRetFunction_End - PATMRetFunction_Start
2468	%ifdef PATM_LOG_PATCHINSTR
2469	DD 9
2470	%else
2471	DD 7
2472	%endif
2473	DD PATM_STACKPTR
2474	DD 0
2475	DD PATM_STACKPTR
2476	DD 0
2477	DD PATM_STACKBASE_GUEST
2478	DD 0
2479	DD PATM_STACKBASE
2480	DD 0
2481	DD PATM_PATCHBASE
2482	DD 0
2483	%ifdef PATM_LOG_PATCHINSTR
2484	DD PATM_PENDINGACTION
2485	DD 0
2486	%endif
2487	DD PATM_PENDINGACTION
2488	DD 0
2489	DD PATM_PATCHBASE
2490	DD 0
2491	%ifdef PATM_LOG_PATCHINSTR
2492	DD PATM_PENDINGACTION
2493	DD 0
2494	%endif
2495	DD 0ffffffffh
2496	SECTION .text
2497
2498
2499	;
2500	; Jump to original instruction if IF=1
2501	;
2502	BEGINPROC PATMCheckIF
2503	PATMCheckIF_Start:
2504	mov dword [ss:PATM_INTERRUPTFLAG], 0
2505	pushf
2506	test dword [ss:PATM_VMFLAGS], X86_EFL_IF
2507	jnz PATMCheckIF_Safe
2508	nop
2509
2510	; IF=0 -> unsafe, so we must call the duplicated function (which we don't do here)
2511	popf
2512	mov dword [ss:PATM_INTERRUPTFLAG], 1
2513	jmp PATMCheckIF_End
2514
2515	PATMCheckIF_Safe:
2516	; invalidate the PATM stack as we'll jump back to guest code
2517	mov dword [ss:PATM_STACKPTR], PATM_STACK_SIZE
2518
2519	%ifdef PATM_LOG_PATCHINSTR
2520	push eax
2521	push ecx
2522	lock or dword [ss:PATM_PENDINGACTION], PATM_ACTION_LOG_IF1
2523	mov eax, PATM_ACTION_LOG_IF1
2524	mov ecx, PATM_ACTION_MAGIC
2525	db 0fh, 0bh ; illegal instr (hardcoded assumption in PATMHandleIllegalInstrTrap)
2526	pop ecx
2527	pop eax
2528	%endif
2529	popf
2530	mov dword [ss:PATM_INTERRUPTFLAG], 1
2531	; IF=1 -> we can safely jump back to the original instruction
2532	DB 0xE9
2533	PATMCheckIF_Jump:
2534	DD PATM_JUMPDELTA
2535	PATMCheckIF_End:
2536	ENDPROC PATMCheckIF
2537
2538	SECTION .data
2539	; Patch record for call instructions
2540	GLOBALNAME PATMCheckIFRecord
2541	RTCCPTR_DEF PATMCheckIF_Start
2542	DD PATMCheckIF_Jump - PATMCheckIF_Start
2543	DD 0
2544	DD 0
2545	DD PATMCheckIF_End - PATMCheckIF_Start
2546	%ifdef PATM_LOG_PATCHINSTR
2547	DD 6
2548	%else
2549	DD 5
2550	%endif
2551	DD PATM_INTERRUPTFLAG
2552	DD 0
2553	DD PATM_VMFLAGS
2554	DD 0
2555	DD PATM_INTERRUPTFLAG
2556	DD 0
2557	DD PATM_STACKPTR
2558	DD 0
2559	%ifdef PATM_LOG_PATCHINSTR
2560	DD PATM_PENDINGACTION
2561	DD 0
2562	%endif
2563	DD PATM_INTERRUPTFLAG
2564	DD 0
2565	DD 0ffffffffh
2566	SECTION .text
2567
2568	;
2569	; Jump back to guest if IF=1, else fault
2570	;
2571	BEGINPROC PATMJumpToGuest_IF1
2572	PATMJumpToGuest_IF1_Start:
2573	mov dword [ss:PATM_INTERRUPTFLAG], 0
2574	pushf
2575	test dword [ss:PATM_VMFLAGS], X86_EFL_IF
2576	jnz PATMJumpToGuest_IF1_Safe
2577	nop
2578
2579	; IF=0 -> unsafe, so fault
2580	popf
2581	mov dword [ss:PATM_INTERRUPTFLAG], 1
2582	PATM_INT3
2583
2584	PATMJumpToGuest_IF1_Safe:
2585	; IF=1 -> we can safely jump back to the original instruction
2586	popf
2587	mov dword [ss:PATM_INTERRUPTFLAG], 1
2588	DB 0xE9
2589	PATMJumpToGuest_IF1_Jump:
2590	DD PATM_JUMPDELTA
2591	PATMJumpToGuest_IF1_End:
2592	ENDPROC PATMJumpToGuest_IF1
2593
2594	SECTION .data
2595	; Patch record for call instructions
2596	GLOBALNAME PATMJumpToGuest_IF1Record
2597	RTCCPTR_DEF PATMJumpToGuest_IF1_Start
2598	DD PATMJumpToGuest_IF1_Jump - PATMJumpToGuest_IF1_Start
2599	DD 0
2600	DD 0
2601	DD PATMJumpToGuest_IF1_End - PATMJumpToGuest_IF1_Start
2602	DD 4
2603	DD PATM_INTERRUPTFLAG
2604	DD 0
2605	DD PATM_VMFLAGS
2606	DD 0
2607	DD PATM_INTERRUPTFLAG
2608	DD 0
2609	DD PATM_INTERRUPTFLAG
2610	DD 0
2611	DD 0ffffffffh
2612	SECTION .text
2613
2614
2615	; check and correct RPL of pushed ss
2616	BEGINPROC PATMMovFromSS
2617	PATMMovFromSS_Start:
2618	push eax
2619	pushfd
2620	mov ax, ss
2621	and ax, 3
2622	cmp ax, 1
2623	jne near PATMMovFromSS_Continue
2624
2625	and dword [esp+8], ~3 ; clear RPL 1
2626	PATMMovFromSS_Continue:
2627	popfd
2628	pop eax
2629	PATMMovFromSS_Start_End:
2630	ENDPROC PATMMovFromSS
2631
2632	SECTION .data
2633	GLOBALNAME PATMMovFromSSRecord
2634	RTCCPTR_DEF PATMMovFromSS_Start
2635	DD 0
2636	DD 0
2637	DD 0
2638	DD PATMMovFromSS_Start_End - PATMMovFromSS_Start
2639	DD 0
2640	DD 0ffffffffh
2641
2642
2643
2644
2645	SECTION .rodata
2646	; For assertion during init (to make absolutely sure the flags are in sync in vm.mac & vm.h)
2647	GLOBALNAME PATMInterruptFlag
2648	DD VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC \| VMCPU_FF_TIMER \| VMCPU_FF_REQUEST
2649

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source: vbox/trunk/src/VBox/VMM/VMMR3/PATMA.asm@ 44410

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