EMAllA.asm@ 2075

Last change on this file since 2075 was 1991, checked in by vboxsync, 18 years ago
Added EMEmulateBts & EMEmulateBtc
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 20.3 KB

Line
1	; $Id: EMAllA.asm 1991 2007-04-09 11:56:29Z vboxsync $
2	;; @file
3	; EM Assembly Routines.
4	;
5
6	;
7	; Copyright (C) 2006 InnoTek Systemberatung GmbH
8	;
9	; This file is part of VirtualBox Open Source Edition (OSE), as
10	; available from http://www.virtualbox.org. This file is free software;
11	; you can redistribute it and/or modify it under the terms of the GNU
12	; General Public License as published by the Free Software Foundation,
13	; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	; distribution. VirtualBox OSE is distributed in the hope that it will
15	; be useful, but WITHOUT ANY WARRANTY of any kind.
16	;
17	; If you received this file as part of a commercial VirtualBox
18	; distribution, then only the terms of your commercial VirtualBox
19	; license agreement apply instead of the previous paragraph.
20	;
21
22	;*******************************************************************************
23	;* Header Files *
24	;*******************************************************************************
25	%include "VBox/asmdefs.mac"
26	%include "VBox/err.mac"
27	%include "VBox/x86.mac"
28
29	;; @def MY_PTR_REG
30	; The register we use for value pointers (And,Or,Dec,Inc).
31	%ifdef __AMD64__
32	%define MY_PTR_REG rcx
33	%else
34	%define MY_PTR_REG ecx
35	%endif
36
37	;; @def MY_RET_REG
38	; The register we return the result in.
39	%ifdef __AMD64__
40	%define MY_RET_REG rax
41	%else
42	%define MY_RET_REG eax
43	%endif
44
45	BEGINCODE
46
47
48	;;
49	; Emulate CMP instruction, CDECL calling conv.
50	; EMDECL(uint32_t) EMEmulateCmp(uint32_t u32Param1, uint32_t u32Param2, size_t cb);
51	;
52	; @returns EFLAGS after the operation, only arithmetic flags is valid.
53	; @param [esp + 04h] rdi rcx Param 1 - First parameter (Dst).
54	; @param [esp + 08h] rsi edx Param 2 - Second parameter (Src).
55	; @param [esp + 0ch] rdx r8 Param 3 - Size of parameters, only 1/2/4 is valid.
56	;
57	align 16
58	BEGINPROC EMEmulateCmp
59	%ifdef __AMD64__
60	%ifdef __WIN64__
61	mov rax, r8 ; eax = size of parameters
62	%else ; !__WIN64__
63	mov rax, rdx ; rax = size of parameters
64	mov rcx, rdi ; rcx = first parameter
65	mov rdx, rsi ; rdx = second parameter
66	%endif ; !__WIN64__
67	%else ; !__AMD64__
68	mov eax, [esp + 0ch] ; eax = size of parameters
69	mov ecx, [esp + 04h] ; ecx = first parameter
70	mov edx, [esp + 08h] ; edx = second parameter
71	%endif
72
73	; switch on size
74	%ifdef __AMD64__
75	cmp al, 8
76	je short .do_qword ; 8 bytes variant
77	%endif
78	cmp al, 4
79	je short .do_dword ; 4 bytes variant
80	cmp al, 2
81	je short .do_word ; 2 byte variant
82	cmp al, 1
83	je short .do_byte ; 1 bytes variant
84	int3
85
86	; workers
87	%ifdef __AMD64__
88	.do_qword:
89	cmp rcx, rdx ; do 8 bytes CMP
90	jmp short .done
91	%endif
92
93	.do_dword:
94	cmp ecx, edx ; do 4 bytes CMP
95	jmp short .done
96
97	.do_word:
98	cmp cx, dx ; do 2 bytes CMP
99	jmp short .done
100
101	.do_byte:
102	cmp cl, dl ; do 1 byte CMP
103
104	; collect flags and return.
105	.done:
106	pushf
107	pop MY_RET_REG
108	retn
109	ENDPROC EMEmulateCmp
110
111
112	;;
113	; Emulate AND instruction, CDECL calling conv.
114	; EMDECL(uint32_t) EMEmulateAnd(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
115	;
116	; @returns EFLAGS after the operation, only arithmetic flags is valid.
117	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
118	; @param [esp + 08h] Param 2 - Second parameter.
119	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
120	; @uses eax, ecx, edx
121	;
122	align 16
123	BEGINPROC EMEmulateAnd
124	%ifdef __AMD64__
125	%ifdef __WIN64__
126	mov rax, r8 ; eax = size of parameters
127	%else ; !__WIN64__
128	mov rax, rdx ; rax = size of parameters
129	mov rcx, rdi ; rcx = first parameter
130	mov rdx, rsi ; rdx = second parameter
131	%endif ; !__WIN64__
132	%else ; !__AMD64__
133	mov eax, [esp + 0ch] ; eax = size of parameters
134	mov ecx, [esp + 04h] ; ecx = first parameter
135	mov edx, [esp + 08h] ; edx = second parameter
136	%endif
137
138	; switch on size
139	%ifdef __AMD64__
140	cmp al, 8
141	je short .do_qword ; 8 bytes variant
142	%endif
143	cmp al, 4
144	je short .do_dword ; 4 bytes variant
145	cmp al, 2
146	je short .do_word ; 2 byte variant
147	cmp al, 1
148	je short .do_byte ; 1 bytes variant
149	int3
150
151	; workers
152	%ifdef __AMD64__
153	.do_qword:
154	and [MY_PTR_REG], rdx ; do 8 bytes AND
155	jmp short .done
156	%endif
157
158	.do_dword:
159	and [MY_PTR_REG], edx ; do 4 bytes AND
160	jmp short .done
161
162	.do_word:
163	and [MY_PTR_REG], dx ; do 2 bytes AND
164	jmp short .done
165
166	.do_byte:
167	and [MY_PTR_REG], dl ; do 1 byte AND
168
169	; collect flags and return.
170	.done:
171	pushf
172	pop MY_RET_REG
173	retn
174	ENDPROC EMEmulateAnd
175
176
177	;;
178	; Emulate OR instruction, CDECL calling conv.
179	; EMDECL(uint32_t) EMEmulateOr(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
180	;
181	; @returns EFLAGS after the operation, only arithmetic flags is valid.
182	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
183	; @param [esp + 08h] Param 2 - Second parameter.
184	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
185	; @uses eax, ecx, edx
186	;
187	align 16
188	BEGINPROC EMEmulateOr
189	%ifdef __AMD64__
190	%ifdef __WIN64__
191	mov rax, r8 ; eax = size of parameters
192	%else ; !__WIN64__
193	mov rax, rdx ; rax = size of parameters
194	mov rcx, rdi ; rcx = first parameter
195	mov rdx, rsi ; rdx = second parameter
196	%endif ; !__WIN64__
197	%else ; !__AMD64__
198	mov eax, [esp + 0ch] ; eax = size of parameters
199	mov ecx, [esp + 04h] ; ecx = first parameter
200	mov edx, [esp + 08h] ; edx = second parameter
201	%endif
202
203	; switch on size
204	%ifdef __AMD64__
205	cmp al, 8
206	je short .do_qword ; 8 bytes variant
207	%endif
208	cmp al, 4
209	je short .do_dword ; 4 bytes variant
210	cmp al, 2
211	je short .do_word ; 2 byte variant
212	cmp al, 1
213	je short .do_byte ; 1 bytes variant
214	int3
215
216	; workers
217	%ifdef __AMD64__
218	.do_qword:
219	or [MY_PTR_REG], rdx ; do 8 bytes OR
220	jmp short .done
221	%endif
222
223	.do_dword:
224	or [MY_PTR_REG], edx ; do 4 bytes OR
225	jmp short .done
226
227	.do_word:
228	or [MY_PTR_REG], dx ; do 2 bytes OR
229	jmp short .done
230
231	.do_byte:
232	or [MY_PTR_REG], dl ; do 1 byte OR
233
234	; collect flags and return.
235	.done:
236	pushf
237	pop MY_RET_REG
238	retn
239	ENDPROC EMEmulateOr
240
241	;;
242	; Emulate XOR instruction, CDECL calling conv.
243	; EMDECL(uint32_t) EMEmulateXor(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
244	;
245	; @returns EFLAGS after the operation, only arithmetic flags is valid.
246	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
247	; @param [esp + 08h] Param 2 - Second parameter.
248	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
249	; @uses eax, ecx, edx
250	;
251	align 16
252	BEGINPROC EMEmulateXor
253	%ifdef __AMD64__
254	%ifdef __WIN64__
255	mov rax, r8 ; eax = size of parameters
256	%else ; !__WIN64__
257	mov rax, rdx ; rax = size of parameters
258	mov rcx, rdi ; rcx = first parameter
259	mov rdx, rsi ; rdx = second parameter
260	%endif ; !__WIN64__
261	%else ; !__AMD64__
262	mov eax, [esp + 0ch] ; eax = size of parameters
263	mov ecx, [esp + 04h] ; ecx = first parameter
264	mov edx, [esp + 08h] ; edx = second parameter
265	%endif
266
267	; switch on size
268	%ifdef __AMD64__
269	cmp al, 8
270	je short .do_qword ; 8 bytes variant
271	%endif
272	cmp al, 4
273	je short .do_dword ; 4 bytes variant
274	cmp al, 2
275	je short .do_word ; 2 byte variant
276	cmp al, 1
277	je short .do_byte ; 1 bytes variant
278	int3
279
280	; workers
281	%ifdef __AMD64__
282	.do_qword:
283	xor [MY_PTR_REG], rdx ; do 8 bytes XOR
284	jmp short .done
285	%endif
286
287	.do_dword:
288	xor [MY_PTR_REG], edx ; do 4 bytes XOR
289	jmp short .done
290
291	.do_word:
292	xor [MY_PTR_REG], dx ; do 2 bytes XOR
293	jmp short .done
294
295	.do_byte:
296	xor [MY_PTR_REG], dl ; do 1 byte XOR
297
298	; collect flags and return.
299	.done:
300	pushf
301	pop MY_RET_REG
302	retn
303	ENDPROC EMEmulateXor
304
305	;;
306	; Emulate INC instruction, CDECL calling conv.
307	; EMDECL(uint32_t) EMEmulateInc(uint32_t *pu32Param1, size_t cb);
308	;
309	; @returns EFLAGS after the operation, only arithmetic flags are valid.
310	; @param [esp + 04h] rdi rcx Param 1 - First parameter - pointer to data item.
311	; @param [esp + 08h] rsi rdx Param 2 - Size of parameters, only 1/2/4 is valid.
312	; @uses eax, ecx, edx
313	;
314	align 16
315	BEGINPROC EMEmulateInc
316	%ifdef __AMD64__
317	%ifdef __WIN64__
318	mov rax, rdx ; eax = size of parameters
319	%else ; !__WIN64__
320	mov rax, rsi ; eax = size of parameters
321	mov rcx, rdi ; rcx = first parameter
322	%endif ; !__WIN64__
323	%else ; !__AMD64__
324	mov eax, [esp + 08h] ; eax = size of parameters
325	mov ecx, [esp + 04h] ; ecx = first parameter
326	%endif
327
328	; switch on size
329	%ifdef __AMD64__
330	cmp al, 8
331	je short .do_qword ; 8 bytes variant
332	%endif
333	cmp al, 4
334	je short .do_dword ; 4 bytes variant
335	cmp al, 2
336	je short .do_word ; 2 byte variant
337	cmp al, 1
338	je short .do_byte ; 1 bytes variant
339	int3
340
341	; workers
342	%ifdef __AMD64__
343	.do_qword:
344	inc qword [MY_PTR_REG] ; do 8 bytes INC
345	jmp short .done
346	%endif
347
348	.do_dword:
349	inc dword [MY_PTR_REG] ; do 4 bytes INC
350	jmp short .done
351
352	.do_word:
353	inc word [MY_PTR_REG] ; do 2 bytes INC
354	jmp short .done
355
356	.do_byte:
357	inc byte [MY_PTR_REG] ; do 1 byte INC
358	jmp short .done
359
360	; collect flags and return.
361	.done:
362	pushf
363	pop MY_RET_REG
364	retn
365	ENDPROC EMEmulateInc
366
367
368	;;
369	; Emulate DEC instruction, CDECL calling conv.
370	; EMDECL(uint32_t) EMEmulateDec(uint32_t *pu32Param1, size_t cb);
371	;
372	; @returns EFLAGS after the operation, only arithmetic flags are valid.
373	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
374	; @param [esp + 08h] Param 2 - Size of parameters, only 1/2/4 is valid.
375	; @uses eax, ecx, edx
376	;
377	align 16
378	BEGINPROC EMEmulateDec
379	%ifdef __AMD64__
380	%ifdef __WIN64__
381	mov rax, rdx ; eax = size of parameters
382	%else ; !__WIN64__
383	mov rax, rsi ; eax = size of parameters
384	mov rcx, rdi ; rcx = first parameter
385	%endif ; !__WIN64__
386	%else ; !__AMD64__
387	mov eax, [esp + 08h] ; eax = size of parameters
388	mov ecx, [esp + 04h] ; ecx = first parameter
389	%endif
390
391	; switch on size
392	%ifdef __AMD64__
393	cmp al, 8
394	je short .do_qword ; 8 bytes variant
395	%endif
396	cmp al, 4
397	je short .do_dword ; 4 bytes variant
398	cmp al, 2
399	je short .do_word ; 2 byte variant
400	cmp al, 1
401	je short .do_byte ; 1 bytes variant
402	int3
403
404	; workers
405	%ifdef __AMD64__
406	.do_qword:
407	dec qword [MY_PTR_REG] ; do 8 bytes DEC
408	jmp short .done
409	%endif
410
411	.do_dword:
412	dec dword [MY_PTR_REG] ; do 4 bytes DEC
413	jmp short .done
414
415	.do_word:
416	dec word [MY_PTR_REG] ; do 2 bytes DEC
417	jmp short .done
418
419	.do_byte:
420	dec byte [MY_PTR_REG] ; do 1 byte DEC
421	jmp short .done
422
423	; collect flags and return.
424	.done:
425	pushf
426	pop MY_RET_REG
427	retn
428	ENDPROC EMEmulateDec
429
430	;;
431	; Emulate ADD instruction, CDECL calling conv.
432	; EMDECL(uint32_t) EMEmulateAdd(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
433	;
434	; @returns EFLAGS after the operation, only arithmetic flags is valid.
435	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
436	; @param [esp + 08h] Param 2 - Second parameter.
437	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
438	; @uses eax, ecx, edx
439	;
440	align 16
441	BEGINPROC EMEmulateAdd
442	%ifdef __AMD64__
443	%ifdef __WIN64__
444	mov rax, r8 ; eax = size of parameters
445	%else ; !__WIN64__
446	mov rax, rdx ; rax = size of parameters
447	mov rcx, rdi ; rcx = first parameter
448	mov rdx, rsi ; rdx = second parameter
449	%endif ; !__WIN64__
450	%else ; !__AMD64__
451	mov eax, [esp + 0ch] ; eax = size of parameters
452	mov ecx, [esp + 04h] ; ecx = first parameter
453	mov edx, [esp + 08h] ; edx = second parameter
454	%endif
455
456	; switch on size
457	%ifdef __AMD64__
458	cmp al, 8
459	je short .do_qword ; 8 bytes variant
460	%endif
461	cmp al, 4
462	je short .do_dword ; 4 bytes variant
463	cmp al, 2
464	je short .do_word ; 2 byte variant
465	cmp al, 1
466	je short .do_byte ; 1 bytes variant
467	int3
468
469	; workers
470	%ifdef __AMD64__
471	.do_qword:
472	add [MY_PTR_REG], rdx ; do 8 bytes ADD
473	jmp short .done
474	%endif
475
476	.do_dword:
477	add [MY_PTR_REG], edx ; do 4 bytes ADD
478	jmp short .done
479
480	.do_word:
481	add [MY_PTR_REG], dx ; do 2 bytes ADD
482	jmp short .done
483
484	.do_byte:
485	add [MY_PTR_REG], dl ; do 1 byte ADD
486
487	; collect flags and return.
488	.done:
489	pushf
490	pop MY_RET_REG
491	retn
492	ENDPROC EMEmulateAdd
493
494	;;
495	; Emulate ADC instruction, CDECL calling conv.
496	; EMDECL(uint32_t) EMEmulateAdcWithCarrySet(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
497	;
498	; @returns EFLAGS after the operation, only arithmetic flags is valid.
499	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
500	; @param [esp + 08h] Param 2 - Second parameter.
501	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
502	; @uses eax, ecx, edx
503	;
504	align 16
505	BEGINPROC EMEmulateAdcWithCarrySet
506	%ifdef __AMD64__
507	%ifdef __WIN64__
508	mov rax, r8 ; eax = size of parameters
509	%else ; !__WIN64__
510	mov rax, rdx ; rax = size of parameters
511	mov rcx, rdi ; rcx = first parameter
512	mov rdx, rsi ; rdx = second parameter
513	%endif ; !__WIN64__
514	%else ; !__AMD64__
515	mov eax, [esp + 0ch] ; eax = size of parameters
516	mov ecx, [esp + 04h] ; ecx = first parameter
517	mov edx, [esp + 08h] ; edx = second parameter
518	%endif
519
520	; switch on size
521	%ifdef __AMD64__
522	cmp al, 8
523	je short .do_qword ; 8 bytes variant
524	%endif
525	cmp al, 4
526	je short .do_dword ; 4 bytes variant
527	cmp al, 2
528	je short .do_word ; 2 byte variant
529	cmp al, 1
530	je short .do_byte ; 1 bytes variant
531	int3
532
533	; workers
534	%ifdef __AMD64__
535	.do_qword:
536	stc ; set carry flag
537	adc [MY_PTR_REG], rdx ; do 8 bytes ADC
538	jmp short .done
539	%endif
540
541	.do_dword:
542	stc ; set carry flag
543	adc [MY_PTR_REG], edx ; do 4 bytes ADC
544	jmp short .done
545
546	.do_word:
547	stc ; set carry flag
548	adc [MY_PTR_REG], dx ; do 2 bytes ADC
549	jmp short .done
550
551	.do_byte:
552	stc ; set carry flag
553	adc [MY_PTR_REG], dl ; do 1 byte ADC
554
555	; collect flags and return.
556	.done:
557	pushf
558	pop MY_RET_REG
559	retn
560	ENDPROC EMEmulateAdcWithCarrySet
561
562	;;
563	; Emulate SUB instruction, CDECL calling conv.
564	; EMDECL(uint32_t) EMEmulateSub(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
565	;
566	; @returns EFLAGS after the operation, only arithmetic flags is valid.
567	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
568	; @param [esp + 08h] Param 2 - Second parameter.
569	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
570	; @uses eax, ecx, edx
571	;
572	align 16
573	BEGINPROC EMEmulateSub
574	%ifdef __AMD64__
575	%ifdef __WIN64__
576	mov rax, r8 ; eax = size of parameters
577	%else ; !__WIN64__
578	mov rax, rdx ; rax = size of parameters
579	mov rcx, rdi ; rcx = first parameter
580	mov rdx, rsi ; rdx = second parameter
581	%endif ; !__WIN64__
582	%else ; !__AMD64__
583	mov eax, [esp + 0ch] ; eax = size of parameters
584	mov ecx, [esp + 04h] ; ecx = first parameter
585	mov edx, [esp + 08h] ; edx = second parameter
586	%endif
587
588	; switch on size
589	%ifdef __AMD64__
590	cmp al, 8
591	je short .do_qword ; 8 bytes variant
592	%endif
593	cmp al, 4
594	je short .do_dword ; 4 bytes variant
595	cmp al, 2
596	je short .do_word ; 2 byte variant
597	cmp al, 1
598	je short .do_byte ; 1 bytes variant
599	int3
600
601	; workers
602	%ifdef __AMD64__
603	.do_qword:
604	sub [MY_PTR_REG], rdx ; do 8 bytes SUB
605	jmp short .done
606	%endif
607
608	.do_dword:
609	sub [MY_PTR_REG], edx ; do 4 bytes SUB
610	jmp short .done
611
612	.do_word:
613	sub [MY_PTR_REG], dx ; do 2 bytes SUB
614	jmp short .done
615
616	.do_byte:
617	sub [MY_PTR_REG], dl ; do 1 byte SUB
618
619	; collect flags and return.
620	.done:
621	pushf
622	pop MY_RET_REG
623	retn
624	ENDPROC EMEmulateSub
625
626
627	;;
628	; Emulate BTR instruction, CDECL calling conv.
629	; EMDECL(uint32_t) EMEmulateBtr(uint32_t *pu32Param1, uint32_t u32Param2);
630	;
631	; @returns EFLAGS after the operation, only arithmetic flags is valid.
632	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
633	; @param [esp + 08h] Param 2 - Second parameter.
634	; @uses eax, ecx, edx
635	;
636	align 16
637	BEGINPROC EMEmulateBtr
638	%ifdef __AMD64__
639	%ifndef __WIN64__
640	mov rcx, rdi ; rcx = first parameter
641	mov rdx, rsi ; rdx = second parameter
642	%endif ; !__WIN64__
643	%else ; !__AMD64__
644	mov ecx, [esp + 04h] ; ecx = first parameter
645	mov edx, [esp + 08h] ; edx = second parameter
646	%endif
647
648	and edx, 7
649	btr [MY_PTR_REG], edx
650
651	; collect flags and return.
652	pushf
653	pop MY_RET_REG
654	retn
655	ENDPROC EMEmulateBtr
656
657	;;
658	; Emulate BTC instruction, CDECL calling conv.
659	; EMDECL(uint32_t) EMEmulateBtc(uint32_t *pu32Param1, uint32_t u32Param2);
660	;
661	; @returns EFLAGS after the operation, only arithmetic flags is valid.
662	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
663	; @param [esp + 08h] Param 2 - Second parameter.
664	; @uses eax, ecx, edx
665	;
666	align 16
667	BEGINPROC EMEmulateBtc
668	%ifdef __AMD64__
669	%ifndef __WIN64__
670	mov rcx, rdi ; rcx = first parameter
671	mov rdx, rsi ; rdx = second parameter
672	%endif ; !__WIN64__
673	%else ; !__AMD64__
674	mov ecx, [esp + 04h] ; ecx = first parameter
675	mov edx, [esp + 08h] ; edx = second parameter
676	%endif
677
678	and edx, 7
679	btc [MY_PTR_REG], edx
680
681	; collect flags and return.
682	pushf
683	pop MY_RET_REG
684	retn
685	ENDPROC EMEmulateBtc
686
687	;;
688	; Emulate BTS instruction, CDECL calling conv.
689	; EMDECL(uint32_t) EMEmulateBts(uint32_t *pu32Param1, uint32_t u32Param2);
690	;
691	; @returns EFLAGS after the operation, only arithmetic flags is valid.
692	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
693	; @param [esp + 08h] Param 2 - Second parameter.
694	; @uses eax, ecx, edx
695	;
696	align 16
697	BEGINPROC EMEmulateBts
698	%ifdef __AMD64__
699	%ifndef __WIN64__
700	mov rcx, rdi ; rcx = first parameter
701	mov rdx, rsi ; rdx = second parameter
702	%endif ; !__WIN64__
703	%else ; !__AMD64__
704	mov ecx, [esp + 04h] ; ecx = first parameter
705	mov edx, [esp + 08h] ; edx = second parameter
706	%endif
707
708	and edx, 7
709	bts [MY_PTR_REG], edx
710
711	; collect flags and return.
712	pushf
713	pop MY_RET_REG
714	retn
715	ENDPROC EMEmulateBts

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source: vbox/trunk/src/VBox/VMM/VMMAll/EMAllA.asm@ 2075

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