EMAllA.asm@ 6297

Last change on this file since 6297 was 5999, checked in by vboxsync, 17 years ago
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1	; $Id: EMAllA.asm 5999 2007-12-07 15:05:06Z vboxsync $
2	;; @file
3	; EM Assembly Routines.
4	;
5
6	;
7	; Copyright (C) 2006-2007 innotek 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 (GPL) as published by the Free Software
13	; Foundation, in version 2 as it comes in the "COPYING" file of the
14	; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	;
17
18	;*******************************************************************************
19	;* Header Files *
20	;*******************************************************************************
21	%include "VBox/asmdefs.mac"
22	%include "VBox/err.mac"
23	%include "VBox/x86.mac"
24
25	;; @def MY_PTR_REG
26	; The register we use for value pointers (And,Or,Dec,Inc).
27	%ifdef RT_ARCH_AMD64
28	%define MY_PTR_REG rcx
29	%else
30	%define MY_PTR_REG ecx
31	%endif
32
33	;; @def MY_RET_REG
34	; The register we return the result in.
35	%ifdef RT_ARCH_AMD64
36	%define MY_RET_REG rax
37	%else
38	%define MY_RET_REG eax
39	%endif
40
41	BEGINCODE
42
43
44	;;
45	; Emulate CMP instruction, CDECL calling conv.
46	; EMDECL(uint32_t) EMEmulateCmp(uint32_t u32Param1, uint32_t u32Param2, size_t cb);
47	;
48	; @returns EFLAGS after the operation, only arithmetic flags is valid.
49	; @param [esp + 04h] rdi rcx Param 1 - First parameter (Dst).
50	; @param [esp + 08h] rsi edx Param 2 - Second parameter (Src).
51	; @param [esp + 0ch] rdx r8 Param 3 - Size of parameters, only 1/2/4 is valid.
52	;
53	align 16
54	BEGINPROC EMEmulateCmp
55	%ifdef RT_ARCH_AMD64
56	%ifdef RT_OS_WINDOWS
57	mov rax, r8 ; eax = size of parameters
58	%else ; !RT_OS_WINDOWS
59	mov rax, rdx ; rax = size of parameters
60	mov rcx, rdi ; rcx = first parameter
61	mov rdx, rsi ; rdx = second parameter
62	%endif ; !RT_OS_WINDOWS
63	%else ; !RT_ARCH_AMD64
64	mov eax, [esp + 0ch] ; eax = size of parameters
65	mov ecx, [esp + 04h] ; ecx = first parameter
66	mov edx, [esp + 08h] ; edx = second parameter
67	%endif
68
69	; switch on size
70	%ifdef RT_ARCH_AMD64
71	cmp al, 8
72	je short .do_qword ; 8 bytes variant
73	%endif
74	cmp al, 4
75	je short .do_dword ; 4 bytes variant
76	cmp al, 2
77	je short .do_word ; 2 byte variant
78	cmp al, 1
79	je short .do_byte ; 1 bytes variant
80	int3
81
82	; workers
83	%ifdef RT_ARCH_AMD64
84	.do_qword:
85	cmp rcx, rdx ; do 8 bytes CMP
86	jmp short .done
87	%endif
88
89	.do_dword:
90	cmp ecx, edx ; do 4 bytes CMP
91	jmp short .done
92
93	.do_word:
94	cmp cx, dx ; do 2 bytes CMP
95	jmp short .done
96
97	.do_byte:
98	cmp cl, dl ; do 1 byte CMP
99
100	; collect flags and return.
101	.done:
102	pushf
103	pop MY_RET_REG
104	retn
105	ENDPROC EMEmulateCmp
106
107
108	;;
109	; Emulate AND instruction, CDECL calling conv.
110	; EMDECL(uint32_t) EMEmulateAnd(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
111	;
112	; @returns EFLAGS after the operation, only arithmetic flags is valid.
113	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
114	; @param [esp + 08h] Param 2 - Second parameter.
115	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
116	; @uses eax, ecx, edx
117	;
118	align 16
119	BEGINPROC EMEmulateAnd
120	%ifdef RT_ARCH_AMD64
121	%ifdef RT_OS_WINDOWS
122	mov rax, r8 ; eax = size of parameters
123	%else ; !RT_OS_WINDOWS
124	mov rax, rdx ; rax = size of parameters
125	mov rcx, rdi ; rcx = first parameter
126	mov rdx, rsi ; rdx = second parameter
127	%endif ; !RT_OS_WINDOWS
128	%else ; !RT_ARCH_AMD64
129	mov eax, [esp + 0ch] ; eax = size of parameters
130	mov ecx, [esp + 04h] ; ecx = first parameter
131	mov edx, [esp + 08h] ; edx = second parameter
132	%endif
133
134	; switch on size
135	%ifdef RT_ARCH_AMD64
136	cmp al, 8
137	je short .do_qword ; 8 bytes variant
138	%endif
139	cmp al, 4
140	je short .do_dword ; 4 bytes variant
141	cmp al, 2
142	je short .do_word ; 2 byte variant
143	cmp al, 1
144	je short .do_byte ; 1 bytes variant
145	int3
146
147	; workers
148	%ifdef RT_ARCH_AMD64
149	.do_qword:
150	and [MY_PTR_REG], rdx ; do 8 bytes AND
151	jmp short .done
152	%endif
153
154	.do_dword:
155	and [MY_PTR_REG], edx ; do 4 bytes AND
156	jmp short .done
157
158	.do_word:
159	and [MY_PTR_REG], dx ; do 2 bytes AND
160	jmp short .done
161
162	.do_byte:
163	and [MY_PTR_REG], dl ; do 1 byte AND
164
165	; collect flags and return.
166	.done:
167	pushf
168	pop MY_RET_REG
169	retn
170	ENDPROC EMEmulateAnd
171
172
173	;;
174	; Emulate OR instruction, CDECL calling conv.
175	; EMDECL(uint32_t) EMEmulateOr(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
176	;
177	; @returns EFLAGS after the operation, only arithmetic flags is valid.
178	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
179	; @param [esp + 08h] Param 2 - Second parameter.
180	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
181	; @uses eax, ecx, edx
182	;
183	align 16
184	BEGINPROC EMEmulateOr
185	%ifdef RT_ARCH_AMD64
186	%ifdef RT_OS_WINDOWS
187	mov rax, r8 ; eax = size of parameters
188	%else ; !RT_OS_WINDOWS
189	mov rax, rdx ; rax = size of parameters
190	mov rcx, rdi ; rcx = first parameter
191	mov rdx, rsi ; rdx = second parameter
192	%endif ; !RT_OS_WINDOWS
193	%else ; !RT_ARCH_AMD64
194	mov eax, [esp + 0ch] ; eax = size of parameters
195	mov ecx, [esp + 04h] ; ecx = first parameter
196	mov edx, [esp + 08h] ; edx = second parameter
197	%endif
198
199	; switch on size
200	%ifdef RT_ARCH_AMD64
201	cmp al, 8
202	je short .do_qword ; 8 bytes variant
203	%endif
204	cmp al, 4
205	je short .do_dword ; 4 bytes variant
206	cmp al, 2
207	je short .do_word ; 2 byte variant
208	cmp al, 1
209	je short .do_byte ; 1 bytes variant
210	int3
211
212	; workers
213	%ifdef RT_ARCH_AMD64
214	.do_qword:
215	or [MY_PTR_REG], rdx ; do 8 bytes OR
216	jmp short .done
217	%endif
218
219	.do_dword:
220	or [MY_PTR_REG], edx ; do 4 bytes OR
221	jmp short .done
222
223	.do_word:
224	or [MY_PTR_REG], dx ; do 2 bytes OR
225	jmp short .done
226
227	.do_byte:
228	or [MY_PTR_REG], dl ; do 1 byte OR
229
230	; collect flags and return.
231	.done:
232	pushf
233	pop MY_RET_REG
234	retn
235	ENDPROC EMEmulateOr
236
237	;;
238	; Emulate LOCK OR instruction.
239	; EMDECL(int) EMEmulateLockOr(RTGCPTR GCPtrParam1, RTGCUINTREG Param2, size_t cbSize, RTGCUINTREG *pf);
240	;
241	; @returns VINF_SUCCESS on success, VERR_ACCESS_DENIED on \#PF (GC only).
242	; @param [esp + 04h] gcc:rdi msc:rcx Param 1 - First parameter - pointer to data item (the real stuff).
243	; @param [esp + 08h] gcc:rsi msc:rdx Param 2 - Second parameter- the immediate / register value.
244	; @param [esp + 0ch] gcc:rdx msc:r8 Param 3 - Size of the operation - 1, 2, 4 or 8 bytes.
245	; @param [esp + 10h] gcc:rcx msc:r9 Param 4 - Where to store the eflags on success.
246	; only arithmetic flags are valid.
247	align 16
248	BEGINPROC EMEmulateLockOr
249	%ifdef RT_ARCH_AMD64
250	%ifdef RT_OS_WINDOWS
251	mov rax, r8 ; eax = size of parameters
252	%else ; !RT_OS_WINDOWS
253	mov rax, rdx ; rax = size of parameters
254	mov rcx, rdi ; rcx = first parameter
255	mov rdx, rsi ; rdx = second parameter
256	%endif ; !RT_OS_WINDOWS
257	%else ; !RT_ARCH_AMD64
258	mov eax, [esp + 0ch] ; eax = size of parameters
259	mov ecx, [esp + 04h] ; ecx = first parameter (MY_PTR_REG)
260	mov edx, [esp + 08h] ; edx = second parameter
261	%endif
262
263	; switch on size
264	%ifdef RT_ARCH_AMD64
265	cmp al, 8
266	je short .do_qword ; 8 bytes variant
267	%endif
268	cmp al, 4
269	je short .do_dword ; 4 bytes variant
270	cmp al, 2
271	je short .do_word ; 2 byte variant
272	cmp al, 1
273	je short .do_byte ; 1 bytes variant
274	int3
275
276	; workers
277	%ifdef RT_ARCH_AMD64
278	.do_qword:
279	lock or [MY_PTR_REG], rdx ; do 8 bytes OR
280	jmp short .done
281	%endif
282
283	.do_dword:
284	lock or [MY_PTR_REG], edx ; do 4 bytes OR
285	jmp short .done
286
287	.do_word:
288	lock or [MY_PTR_REG], dx ; do 2 bytes OR
289	jmp short .done
290
291	.do_byte:
292	lock or [MY_PTR_REG], dl ; do 1 byte OR
293
294	; collect flags and return.
295	.done:
296	pushf
297	%ifdef RT_ARCH_AMD64
298	pop rax
299	%ifdef RT_OS_WINDOWS
300	mov [r9], eax
301	%else ; !RT_OS_WINDOWS
302	mov [rcx], eax
303	%endif ; !RT_OS_WINDOWS
304	%else ; !RT_ARCH_AMD64
305	mov eax, [esp + 10h + 4]
306	pop dword [eax]
307	%endif
308	mov eax, VINF_SUCCESS
309	retn
310
311	%ifdef IN_GC
312	; #PF resume point.
313	GLOBALNAME EMEmulateLockOr_Error
314	mov eax, VERR_ACCESS_DENIED
315	ret
316	%endif
317
318	ENDPROC EMEmulateLockOr
319
320	;;
321	; Emulate XOR instruction, CDECL calling conv.
322	; EMDECL(uint32_t) EMEmulateXor(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
323	;
324	; @returns EFLAGS after the operation, only arithmetic flags is valid.
325	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
326	; @param [esp + 08h] Param 2 - Second parameter.
327	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
328	; @uses eax, ecx, edx
329	;
330	align 16
331	BEGINPROC EMEmulateXor
332	%ifdef RT_ARCH_AMD64
333	%ifdef RT_OS_WINDOWS
334	mov rax, r8 ; eax = size of parameters
335	%else ; !RT_OS_WINDOWS
336	mov rax, rdx ; rax = size of parameters
337	mov rcx, rdi ; rcx = first parameter
338	mov rdx, rsi ; rdx = second parameter
339	%endif ; !RT_OS_WINDOWS
340	%else ; !RT_ARCH_AMD64
341	mov eax, [esp + 0ch] ; eax = size of parameters
342	mov ecx, [esp + 04h] ; ecx = first parameter
343	mov edx, [esp + 08h] ; edx = second parameter
344	%endif
345
346	; switch on size
347	%ifdef RT_ARCH_AMD64
348	cmp al, 8
349	je short .do_qword ; 8 bytes variant
350	%endif
351	cmp al, 4
352	je short .do_dword ; 4 bytes variant
353	cmp al, 2
354	je short .do_word ; 2 byte variant
355	cmp al, 1
356	je short .do_byte ; 1 bytes variant
357	int3
358
359	; workers
360	%ifdef RT_ARCH_AMD64
361	.do_qword:
362	xor [MY_PTR_REG], rdx ; do 8 bytes XOR
363	jmp short .done
364	%endif
365
366	.do_dword:
367	xor [MY_PTR_REG], edx ; do 4 bytes XOR
368	jmp short .done
369
370	.do_word:
371	xor [MY_PTR_REG], dx ; do 2 bytes XOR
372	jmp short .done
373
374	.do_byte:
375	xor [MY_PTR_REG], dl ; do 1 byte XOR
376
377	; collect flags and return.
378	.done:
379	pushf
380	pop MY_RET_REG
381	retn
382	ENDPROC EMEmulateXor
383
384	;;
385	; Emulate INC instruction, CDECL calling conv.
386	; EMDECL(uint32_t) EMEmulateInc(uint32_t *pu32Param1, size_t cb);
387	;
388	; @returns EFLAGS after the operation, only arithmetic flags are valid.
389	; @param [esp + 04h] rdi rcx Param 1 - First parameter - pointer to data item.
390	; @param [esp + 08h] rsi rdx Param 2 - Size of parameters, only 1/2/4 is valid.
391	; @uses eax, ecx, edx
392	;
393	align 16
394	BEGINPROC EMEmulateInc
395	%ifdef RT_ARCH_AMD64
396	%ifdef RT_OS_WINDOWS
397	mov rax, rdx ; eax = size of parameters
398	%else ; !RT_OS_WINDOWS
399	mov rax, rsi ; eax = size of parameters
400	mov rcx, rdi ; rcx = first parameter
401	%endif ; !RT_OS_WINDOWS
402	%else ; !RT_ARCH_AMD64
403	mov eax, [esp + 08h] ; eax = size of parameters
404	mov ecx, [esp + 04h] ; ecx = first parameter
405	%endif
406
407	; switch on size
408	%ifdef RT_ARCH_AMD64
409	cmp al, 8
410	je short .do_qword ; 8 bytes variant
411	%endif
412	cmp al, 4
413	je short .do_dword ; 4 bytes variant
414	cmp al, 2
415	je short .do_word ; 2 byte variant
416	cmp al, 1
417	je short .do_byte ; 1 bytes variant
418	int3
419
420	; workers
421	%ifdef RT_ARCH_AMD64
422	.do_qword:
423	inc qword [MY_PTR_REG] ; do 8 bytes INC
424	jmp short .done
425	%endif
426
427	.do_dword:
428	inc dword [MY_PTR_REG] ; do 4 bytes INC
429	jmp short .done
430
431	.do_word:
432	inc word [MY_PTR_REG] ; do 2 bytes INC
433	jmp short .done
434
435	.do_byte:
436	inc byte [MY_PTR_REG] ; do 1 byte INC
437	jmp short .done
438
439	; collect flags and return.
440	.done:
441	pushf
442	pop MY_RET_REG
443	retn
444	ENDPROC EMEmulateInc
445
446
447	;;
448	; Emulate DEC instruction, CDECL calling conv.
449	; EMDECL(uint32_t) EMEmulateDec(uint32_t *pu32Param1, size_t cb);
450	;
451	; @returns EFLAGS after the operation, only arithmetic flags are valid.
452	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
453	; @param [esp + 08h] Param 2 - Size of parameters, only 1/2/4 is valid.
454	; @uses eax, ecx, edx
455	;
456	align 16
457	BEGINPROC EMEmulateDec
458	%ifdef RT_ARCH_AMD64
459	%ifdef RT_OS_WINDOWS
460	mov rax, rdx ; eax = size of parameters
461	%else ; !RT_OS_WINDOWS
462	mov rax, rsi ; eax = size of parameters
463	mov rcx, rdi ; rcx = first parameter
464	%endif ; !RT_OS_WINDOWS
465	%else ; !RT_ARCH_AMD64
466	mov eax, [esp + 08h] ; eax = size of parameters
467	mov ecx, [esp + 04h] ; ecx = first parameter
468	%endif
469
470	; switch on size
471	%ifdef RT_ARCH_AMD64
472	cmp al, 8
473	je short .do_qword ; 8 bytes variant
474	%endif
475	cmp al, 4
476	je short .do_dword ; 4 bytes variant
477	cmp al, 2
478	je short .do_word ; 2 byte variant
479	cmp al, 1
480	je short .do_byte ; 1 bytes variant
481	int3
482
483	; workers
484	%ifdef RT_ARCH_AMD64
485	.do_qword:
486	dec qword [MY_PTR_REG] ; do 8 bytes DEC
487	jmp short .done
488	%endif
489
490	.do_dword:
491	dec dword [MY_PTR_REG] ; do 4 bytes DEC
492	jmp short .done
493
494	.do_word:
495	dec word [MY_PTR_REG] ; do 2 bytes DEC
496	jmp short .done
497
498	.do_byte:
499	dec byte [MY_PTR_REG] ; do 1 byte DEC
500	jmp short .done
501
502	; collect flags and return.
503	.done:
504	pushf
505	pop MY_RET_REG
506	retn
507	ENDPROC EMEmulateDec
508
509	;;
510	; Emulate ADD instruction, CDECL calling conv.
511	; EMDECL(uint32_t) EMEmulateAdd(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
512	;
513	; @returns EFLAGS after the operation, only arithmetic flags is valid.
514	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
515	; @param [esp + 08h] Param 2 - Second parameter.
516	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
517	; @uses eax, ecx, edx
518	;
519	align 16
520	BEGINPROC EMEmulateAdd
521	%ifdef RT_ARCH_AMD64
522	%ifdef RT_OS_WINDOWS
523	mov rax, r8 ; eax = size of parameters
524	%else ; !RT_OS_WINDOWS
525	mov rax, rdx ; rax = size of parameters
526	mov rcx, rdi ; rcx = first parameter
527	mov rdx, rsi ; rdx = second parameter
528	%endif ; !RT_OS_WINDOWS
529	%else ; !RT_ARCH_AMD64
530	mov eax, [esp + 0ch] ; eax = size of parameters
531	mov ecx, [esp + 04h] ; ecx = first parameter
532	mov edx, [esp + 08h] ; edx = second parameter
533	%endif
534
535	; switch on size
536	%ifdef RT_ARCH_AMD64
537	cmp al, 8
538	je short .do_qword ; 8 bytes variant
539	%endif
540	cmp al, 4
541	je short .do_dword ; 4 bytes variant
542	cmp al, 2
543	je short .do_word ; 2 byte variant
544	cmp al, 1
545	je short .do_byte ; 1 bytes variant
546	int3
547
548	; workers
549	%ifdef RT_ARCH_AMD64
550	.do_qword:
551	add [MY_PTR_REG], rdx ; do 8 bytes ADD
552	jmp short .done
553	%endif
554
555	.do_dword:
556	add [MY_PTR_REG], edx ; do 4 bytes ADD
557	jmp short .done
558
559	.do_word:
560	add [MY_PTR_REG], dx ; do 2 bytes ADD
561	jmp short .done
562
563	.do_byte:
564	add [MY_PTR_REG], dl ; do 1 byte ADD
565
566	; collect flags and return.
567	.done:
568	pushf
569	pop MY_RET_REG
570	retn
571	ENDPROC EMEmulateAdd
572
573	;;
574	; Emulate ADC instruction, CDECL calling conv.
575	; EMDECL(uint32_t) EMEmulateAdcWithCarrySet(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
576	;
577	; @returns EFLAGS after the operation, only arithmetic flags is valid.
578	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
579	; @param [esp + 08h] Param 2 - Second parameter.
580	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
581	; @uses eax, ecx, edx
582	;
583	align 16
584	BEGINPROC EMEmulateAdcWithCarrySet
585	%ifdef RT_ARCH_AMD64
586	%ifdef RT_OS_WINDOWS
587	mov rax, r8 ; eax = size of parameters
588	%else ; !RT_OS_WINDOWS
589	mov rax, rdx ; rax = size of parameters
590	mov rcx, rdi ; rcx = first parameter
591	mov rdx, rsi ; rdx = second parameter
592	%endif ; !RT_OS_WINDOWS
593	%else ; !RT_ARCH_AMD64
594	mov eax, [esp + 0ch] ; eax = size of parameters
595	mov ecx, [esp + 04h] ; ecx = first parameter
596	mov edx, [esp + 08h] ; edx = second parameter
597	%endif
598
599	; switch on size
600	%ifdef RT_ARCH_AMD64
601	cmp al, 8
602	je short .do_qword ; 8 bytes variant
603	%endif
604	cmp al, 4
605	je short .do_dword ; 4 bytes variant
606	cmp al, 2
607	je short .do_word ; 2 byte variant
608	cmp al, 1
609	je short .do_byte ; 1 bytes variant
610	int3
611
612	; workers
613	%ifdef RT_ARCH_AMD64
614	.do_qword:
615	stc ; set carry flag
616	adc [MY_PTR_REG], rdx ; do 8 bytes ADC
617	jmp short .done
618	%endif
619
620	.do_dword:
621	stc ; set carry flag
622	adc [MY_PTR_REG], edx ; do 4 bytes ADC
623	jmp short .done
624
625	.do_word:
626	stc ; set carry flag
627	adc [MY_PTR_REG], dx ; do 2 bytes ADC
628	jmp short .done
629
630	.do_byte:
631	stc ; set carry flag
632	adc [MY_PTR_REG], dl ; do 1 byte ADC
633
634	; collect flags and return.
635	.done:
636	pushf
637	pop MY_RET_REG
638	retn
639	ENDPROC EMEmulateAdcWithCarrySet
640
641	;;
642	; Emulate SUB instruction, CDECL calling conv.
643	; EMDECL(uint32_t) EMEmulateSub(uint32_t *pu32Param1, uint32_t u32Param2, size_t cb);
644	;
645	; @returns EFLAGS after the operation, only arithmetic flags is valid.
646	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
647	; @param [esp + 08h] Param 2 - Second parameter.
648	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
649	; @uses eax, ecx, edx
650	;
651	align 16
652	BEGINPROC EMEmulateSub
653	%ifdef RT_ARCH_AMD64
654	%ifdef RT_OS_WINDOWS
655	mov rax, r8 ; eax = size of parameters
656	%else ; !RT_OS_WINDOWS
657	mov rax, rdx ; rax = size of parameters
658	mov rcx, rdi ; rcx = first parameter
659	mov rdx, rsi ; rdx = second parameter
660	%endif ; !RT_OS_WINDOWS
661	%else ; !RT_ARCH_AMD64
662	mov eax, [esp + 0ch] ; eax = size of parameters
663	mov ecx, [esp + 04h] ; ecx = first parameter
664	mov edx, [esp + 08h] ; edx = second parameter
665	%endif
666
667	; switch on size
668	%ifdef RT_ARCH_AMD64
669	cmp al, 8
670	je short .do_qword ; 8 bytes variant
671	%endif
672	cmp al, 4
673	je short .do_dword ; 4 bytes variant
674	cmp al, 2
675	je short .do_word ; 2 byte variant
676	cmp al, 1
677	je short .do_byte ; 1 bytes variant
678	int3
679
680	; workers
681	%ifdef RT_ARCH_AMD64
682	.do_qword:
683	sub [MY_PTR_REG], rdx ; do 8 bytes SUB
684	jmp short .done
685	%endif
686
687	.do_dword:
688	sub [MY_PTR_REG], edx ; do 4 bytes SUB
689	jmp short .done
690
691	.do_word:
692	sub [MY_PTR_REG], dx ; do 2 bytes SUB
693	jmp short .done
694
695	.do_byte:
696	sub [MY_PTR_REG], dl ; do 1 byte SUB
697
698	; collect flags and return.
699	.done:
700	pushf
701	pop MY_RET_REG
702	retn
703	ENDPROC EMEmulateSub
704
705
706	;;
707	; Emulate BTR instruction, CDECL calling conv.
708	; EMDECL(uint32_t) EMEmulateBtr(uint32_t *pu32Param1, uint32_t u32Param2);
709	;
710	; @returns EFLAGS after the operation, only arithmetic flags is valid.
711	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
712	; @param [esp + 08h] Param 2 - Second parameter.
713	; @uses eax, ecx, edx
714	;
715	align 16
716	BEGINPROC EMEmulateBtr
717	%ifdef RT_ARCH_AMD64
718	%ifndef RT_OS_WINDOWS
719	mov rcx, rdi ; rcx = first parameter
720	mov rdx, rsi ; rdx = second parameter
721	%endif ; !RT_OS_WINDOWS
722	%else ; !RT_ARCH_AMD64
723	mov ecx, [esp + 04h] ; ecx = first parameter
724	mov edx, [esp + 08h] ; edx = second parameter
725	%endif
726
727	and edx, 7
728	btr [MY_PTR_REG], edx
729
730	; collect flags and return.
731	pushf
732	pop MY_RET_REG
733	retn
734	ENDPROC EMEmulateBtr
735
736	;;
737	; Emulate LOCK BTR instruction.
738	; EMDECL(int) EMEmulateLockBtr(RTGCPTR GCPtrParam1, RTGCUINTREG Param2, uint32_t *pf);
739	;
740	; @returns VINF_SUCCESS on success, VERR_ACCESS_DENIED on \#PF (GC only).
741	; @param [esp + 04h] gcc:rdi msc:rcx Param 1 - First parameter - pointer to data item (the real stuff).
742	; @param [esp + 08h] gcc:rsi msc:rdx Param 2 - Second parameter- the immediate / register value. (really an 8 byte value)
743	; @param [esp + 0ch] gcc:rdx msc:r8 Param 3 - Where to store the eflags on success.
744	;
745	align 16
746	BEGINPROC EMEmulateLockBtr
747	%ifdef RT_ARCH_AMD64
748	%ifdef RT_OS_WINDOWS
749	mov rax, r8 ; rax = third parameter
750	%else ; !RT_OS_WINDOWS
751	mov rcx, rdi ; rcx = first parameter
752	mov rax, rdx ; rax = third parameter
753	mov rdx, rsi ; rdx = second parameter
754	%endif ; !RT_OS_WINDOWS
755	%else ; !RT_ARCH_AMD64
756	mov ecx, [esp + 04h] ; ecx = first parameter
757	mov edx, [esp + 08h] ; edx = second parameter
758	mov eax, [esp + 0ch] ; eax = third parameter
759	%endif
760
761	lock btr [MY_PTR_REG], edx
762
763	; collect flags and return.
764	pushf
765	pop xDX
766	mov [xAX], edx
767	mov eax, VINF_SUCCESS
768	retn
769
770	%ifdef IN_GC
771	; #PF resume point.
772	GLOBALNAME EMEmulateLockBtr_Error
773	mov eax, VERR_ACCESS_DENIED
774	ret
775	%endif
776
777	ENDPROC EMEmulateLockBtr
778
779	;;
780	; Emulate BTC instruction, CDECL calling conv.
781	; EMDECL(uint32_t) EMEmulateBtc(uint32_t *pu32Param1, uint32_t u32Param2);
782	;
783	; @returns EFLAGS after the operation, only arithmetic flags is valid.
784	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
785	; @param [esp + 08h] Param 2 - Second parameter.
786	; @uses eax, ecx, edx
787	;
788	align 16
789	BEGINPROC EMEmulateBtc
790	%ifdef RT_ARCH_AMD64
791	%ifndef RT_OS_WINDOWS
792	mov rcx, rdi ; rcx = first parameter
793	mov rdx, rsi ; rdx = second parameter
794	%endif ; !RT_OS_WINDOWS
795	%else ; !RT_ARCH_AMD64
796	mov ecx, [esp + 04h] ; ecx = first parameter
797	mov edx, [esp + 08h] ; edx = second parameter
798	%endif
799
800	and edx, 7
801	btc [MY_PTR_REG], edx
802
803	; collect flags and return.
804	pushf
805	pop MY_RET_REG
806	retn
807	ENDPROC EMEmulateBtc
808
809	;;
810	; Emulate BTS instruction, CDECL calling conv.
811	; EMDECL(uint32_t) EMEmulateBts(uint32_t *pu32Param1, uint32_t u32Param2);
812	;
813	; @returns EFLAGS after the operation, only arithmetic flags is valid.
814	; @param [esp + 04h] Param 1 - First parameter - pointer to data item.
815	; @param [esp + 08h] Param 2 - Second parameter.
816	; @uses eax, ecx, edx
817	;
818	align 16
819	BEGINPROC EMEmulateBts
820	%ifdef RT_ARCH_AMD64
821	%ifndef RT_OS_WINDOWS
822	mov rcx, rdi ; rcx = first parameter
823	mov rdx, rsi ; rdx = second parameter
824	%endif ; !RT_OS_WINDOWS
825	%else ; !RT_ARCH_AMD64
826	mov ecx, [esp + 04h] ; ecx = first parameter
827	mov edx, [esp + 08h] ; edx = second parameter
828	%endif
829
830	and edx, 7
831	bts [MY_PTR_REG], edx
832
833	; collect flags and return.
834	pushf
835	pop MY_RET_REG
836	retn
837	ENDPROC EMEmulateBts

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source: vbox/trunk/src/VBox/VMM/VMMAll/EMAllA.asm@ 6297

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