asm-watcom-x86-16.h@ 69010

Last change on this file since 69010 was 68606, checked in by vboxsync, 7 years ago
iprt/asm*: Made the code safe to use with 16-bit code models employing near data pointers (i.e. adding RT_FAR to all pointers).
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File size: 21.6 KB

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1	/** @file
2	* IPRT - Assembly Functions, x86 16-bit Watcom C/C++ pragma aux.
3	*/
4
5	/*
6	* Copyright (C) 2006-2016 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	* The contents of this file may alternatively be used under the terms
17	* of the Common Development and Distribution License Version 1.0
18	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
19	* VirtualBox OSE distribution, in which case the provisions of the
20	* CDDL are applicable instead of those of the GPL.
21	*
22	* You may elect to license modified versions of this file under the
23	* terms and conditions of either the GPL or the CDDL or both.
24	*/
25
26	#ifndef ___iprt_asm_h
27	# error "Don't include this header directly."
28	#endif
29	#ifndef ___iprt_asm_watcom_x86_16_h
30	#define ___iprt_asm_watcom_x86_16_h
31
32
33	/*
34	* Turns out we cannot use 'ds' for segment stuff here because the compiler
35	* seems to insists on loading the DGROUP segment into 'ds' before calling
36	* stuff when using -ecc. Using 'es' instead as this seems to work fine.
37	*
38	* Note! The #undef that preceds the #pragma aux statements is for undoing
39	* the mangling, because the symbol in #pragma aux [symbol] statements
40	* doesn't get subjected to preprocessing. This is also why we include
41	* the watcom header at the top rather than at the bottom of the
42	* asm-amd64-x86.h file.
43	*/
44
45	#undef ASMCompilerBarrier
46	#if 0 /* overkill version. */
47	# pragma aux ASMCompilerBarrier = \
48	"nop" \
49	parm [] \
50	modify exact [ax bx cx dx es ds];
51	#else
52	# pragma aux ASMCompilerBarrier = \
53	"" \
54	parm [] \
55	modify exact [];
56	#endif
57
58	#undef ASMNopPause
59	#pragma aux ASMNopPause = \
60	".686p" \
61	".xmm2" \
62	"pause" \
63	parm [] nomemory \
64	modify exact [] nomemory;
65
66	#undef ASMAtomicXchgU8
67	#pragma aux ASMAtomicXchgU8 = \
68	"xchg es:[bx], al" \
69	parm [es bx] [al] \
70	value [al] \
71	modify exact [al];
72
73	#undef ASMAtomicXchgU16
74	#pragma aux ASMAtomicXchgU16 = \
75	"xchg es:[bx], ax" \
76	parm [es bx] [ax] \
77	value [ax] \
78	modify exact [ax];
79
80	#undef ASMAtomicXchgU32
81	#pragma aux ASMAtomicXchgU32 = \
82	".386" \
83	"shl ecx, 16" \
84	"mov cx, ax" \
85	"xchg es:[bx], ecx" \
86	"mov eax, ecx" \
87	"shr ecx, 16" \
88	parm [es bx] [ax cx] \
89	value [ax cx] \
90	modify exact [ax cx];
91
92	#undef ASMAtomicXchgU64
93	#pragma aux ASMAtomicXchgU64 = \
94	".586" \
95	"shl eax, 16" \
96	"mov ax, bx" /* eax = high dword */ \
97	"shl ecx, 16" \
98	"mov cx, dx" /* ecx = low dword */ \
99	"mov ebx, ecx" /* ebx = low */ \
100	"mov ecx, eax" /* ecx = high */ \
101	"try_again:" \
102	"lock cmpxchg8b es:[si]" \
103	"jnz try_again" \
104	"xchg eax, edx" \
105	"mov ebx, eax" \
106	"shr eax, 16" \
107	"mov ecx, edx" \
108	"shr ecx, 16" \
109	parm [es si] [dx cx bx ax] \
110	value [dx cx bx ax] \
111	modify exact [dx cx bx ax];
112
113	#undef ASMAtomicCmpXchgU8
114	#pragma aux ASMAtomicCmpXchgU8 = \
115	".486" \
116	"lock cmpxchg es:[bx], cl" \
117	"setz al" \
118	parm [es bx] [cl] [al] \
119	value [al] \
120	modify exact [al];
121
122	#undef ASMAtomicCmpXchgU16
123	#pragma aux ASMAtomicCmpXchgU16 = \
124	".486" \
125	"lock cmpxchg es:[bx], cx" \
126	"setz al" \
127	parm [es bx] [cx] [ax] \
128	value [al] \
129	modify exact [ax];
130
131	#undef ASMAtomicCmpXchgU32
132	#pragma aux ASMAtomicCmpXchgU32 = \
133	".486" \
134	"shl ecx, 16" \
135	"mov cx, dx" \
136	"shl eax, 16" \
137	"mov ax, di" \
138	"rol eax, 16" \
139	"lock cmpxchg es:[bx], ecx" \
140	"setz al" \
141	parm [es bx] [cx dx] [ax di] \
142	value [al] \
143	modify exact [ax cx];
144
145	/* ASMAtomicCmpXchgU64: External assembly implementation, too few registers for parameters. */
146	/* ASMAtomicCmpXchgExU32: External assembly implementation, too few registers for parameters. */
147	/* ASMAtomicCmpXchgExU64: External assembly implementation, too few registers for parameters. */
148
149	#undef ASMSerializeInstructionCpuId
150	#pragma aux ASMSerializeInstructionCpuId = \
151	".586" \
152	"xor eax, eax" \
153	"cpuid" \
154	parm [] \
155	modify exact [ax bx cx dx];
156
157	#undef ASMSerializeInstructionIRet
158	#pragma aux ASMSerializeInstructionIRet = \
159	"pushf" \
160	"push cs" \
161	"call foo" /* 'push offset done' doesn't work */ \
162	"jmp done" \
163	"foo:" \
164	"iret" \
165	"done:" \
166	parm [] \
167	modify exact [];
168
169	#undef ASMSerializeInstructionRdTscp
170	#pragma aux ASMSerializeInstructionRdTscp = \
171	0x0f 0x01 0xf9 \
172	parm [] \
173	modify exact [ax dx cx];
174
175	#undef ASMAtomicReadU64
176	#pragma aux ASMAtomicReadU64 = \
177	".586" \
178	"xor eax, eax" \
179	"xor edx, edx" \
180	"xor ebx, ebx" \
181	"xor ecx, ecx" \
182	"lock cmpxchg8b es:[si]" \
183	"xchg eax, edx" \
184	"mov ebx, eax" \
185	"shr eax, 16" \
186	"mov ecx, edx" \
187	"shr ecx, 16" \
188	parm [es si] \
189	value [dx cx bx ax] \
190	modify exact [dx cx bx ax];
191
192	#undef ASMAtomicUoReadU64
193	#pragma aux ASMAtomicUoReadU64 = \
194	".586" \
195	"xor eax, eax" \
196	"xor edx, edx" \
197	"xor ebx, ebx" \
198	"xor ecx, ecx" \
199	"lock cmpxchg8b es:[si]" \
200	"xchg eax, edx" \
201	"mov ebx, eax" \
202	"shr eax, 16" \
203	"mov ecx, edx" \
204	"shr ecx, 16" \
205	parm [es si] \
206	value [dx cx bx ax] \
207	modify exact [dx cx bx ax];
208
209	#undef ASMAtomicAddU16
210	#pragma aux ASMAtomicAddU16 = \
211	".486" \
212	"lock xadd es:[bx], ax" \
213	parm [es bx] [ax] \
214	value [ax] \
215	modify exact [ax];
216
217	#undef ASMAtomicAddU32
218	#pragma aux ASMAtomicAddU32 = \
219	".486" \
220	"shl edx, 16" \
221	"mov dx, ax" \
222	"lock xadd es:[bx], edx" \
223	"mov ax, dx" \
224	"shr edx, 16" \
225	parm [es bx] [ax dx] \
226	value [ax dx] \
227	modify exact [ax dx];
228
229	#undef ASMAtomicIncU16
230	#pragma aux ASMAtomicIncU16 = \
231	".486" \
232	"mov ax, 1" \
233	"lock xadd es:[bx], ax" \
234	"inc ax" \
235	parm [es bx] \
236	value [ax] \
237	modify exact [ax];
238
239	#undef ASMAtomicIncU32
240	#pragma aux ASMAtomicIncU32 = \
241	".486" \
242	"mov edx, 1" \
243	"lock xadd es:[bx], edx" \
244	"inc edx" \
245	"mov ax, dx" \
246	"shr edx, 16" \
247	parm [es bx] \
248	value [ax dx] \
249	modify exact [ax dx];
250
251	/* ASMAtomicIncU64: Should be done by C inline or in external file. */
252
253	#undef ASMAtomicDecU16
254	#pragma aux ASMAtomicDecU16 = \
255	".486" \
256	"mov ax, 0ffffh" \
257	"lock xadd es:[bx], ax" \
258	"dec ax" \
259	parm [es bx] \
260	value [ax] \
261	modify exact [ax];
262
263	#undef ASMAtomicDecU32
264	#pragma aux ASMAtomicDecU32 = \
265	".486" \
266	"mov edx, 0ffffffffh" \
267	"lock xadd es:[bx], edx" \
268	"dec edx" \
269	"mov ax, dx" \
270	"shr edx, 16" \
271	parm [es bx] \
272	value [ax dx] \
273	modify exact [ax dx];
274
275	/* ASMAtomicDecU64: Should be done by C inline or in external file. */
276
277	#undef ASMAtomicOrU32
278	#pragma aux ASMAtomicOrU32 = \
279	".386" \
280	"shl edx, 16" \
281	"mov dx, ax" \
282	"lock or es:[bx], edx" \
283	parm [es bx] [ax dx] \
284	modify exact [dx];
285
286	/* ASMAtomicOrU64: Should be done by C inline or in external file. */
287
288	#undef ASMAtomicAndU32
289	#pragma aux ASMAtomicAndU32 = \
290	".386" \
291	"shl edx, 16" \
292	"mov dx, ax" \
293	"lock and es:[bx], edx" \
294	parm [es bx] [ax dx] \
295	modify exact [dx];
296
297	/* ASMAtomicAndU64: Should be done by C inline or in external file. */
298
299	#undef ASMAtomicUoOrU32
300	#pragma aux ASMAtomicUoOrU32 = \
301	".386" \
302	"shl edx, 16" \
303	"mov dx, ax" \
304	"or es:[bx], edx" \
305	parm [es bx] [ax dx] \
306	modify exact [dx];
307
308	/* ASMAtomicUoOrU64: Should be done by C inline or in external file. */
309
310	#undef ASMAtomicUoAndU32
311	#pragma aux ASMAtomicUoAndU32 = \
312	".386" \
313	"shl edx, 16" \
314	"mov dx, ax" \
315	"and es:[bx], edx" \
316	parm [es bx] [ax dx] \
317	modify exact [dx];
318
319	/* ASMAtomicUoAndU64: Should be done by C inline or in external file. */
320
321	#undef ASMAtomicUoIncU32
322	#pragma aux ASMAtomicUoIncU32 = \
323	".486" \
324	"mov edx, 1" \
325	"xadd es:[bx], edx" \
326	"inc edx" \
327	"mov ax, dx" \
328	"shr edx, 16" \
329	parm [es bx] \
330	value [ax dx] \
331	modify exact [ax dx];
332
333	#undef ASMAtomicUoDecU32
334	#pragma aux ASMAtomicUoDecU32 = \
335	".486" \
336	"mov edx, 0ffffffffh" \
337	"xadd es:[bx], edx" \
338	"dec edx" \
339	"mov ax, dx" \
340	"shr edx, 16" \
341	parm [es bx] \
342	value [ax dx] \
343	modify exact [ax dx];
344
345	#undef ASMMemZeroPage
346	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
347	# pragma aux ASMMemZeroPage = \
348	"mov cx, 2048" \
349	"xor ax, ax" \
350	"rep stosw" \
351	parm [es di] \
352	modify exact [ax cx di];
353	#else
354	# pragma aux ASMMemZeroPage = \
355	"mov ecx, 1024" \
356	"xor eax, eax" \
357	"rep stosd" \
358	parm [es di] \
359	modify exact [ax cx di];
360	#endif
361
362	#undef ASMMemZero32
363	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
364	# pragma aux ASMMemZero32 = \
365	"xor ax, ax" \
366	"shr cx, 1" \
367	"shr cx, 1" \
368	"rep stosw" \
369	parm [es di] [cx] \
370	modify exact [ax dx cx di];
371	#else
372	# pragma aux ASMMemZero32 = \
373	"and ecx, 0ffffh" /* probably not necessary, lazy bird should check... */ \
374	"shr ecx, 2" \
375	"xor eax, eax" \
376	"rep stosd" \
377	parm [es di] [cx] \
378	modify exact [ax cx di];
379	#endif
380
381	#undef ASMMemFill32
382	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
383	# pragma aux ASMMemFill32 = \
384	" shr cx, 1" \
385	" shr cx, 1" \
386	" jz done" \
387	"again:" \
388	" stosw" \
389	" xchg ax, dx" \
390	" stosw" \
391	" xchg ax, dx" \
392	" dec cx" \
393	" jnz again" \
394	"done:" \
395	parm [es di] [cx] [ax dx]\
396	modify exact [cx di];
397	#else
398	# pragma aux ASMMemFill32 = \
399	"and ecx, 0ffffh" /* probably not necessary, lazy bird should check... */ \
400	"shr ecx, 2" \
401	"shl eax, 16" \
402	"mov ax, dx" \
403	"rol eax, 16" \
404	"rep stosd" \
405	parm [es di] [cx] [ax dx]\
406	modify exact [ax cx di];
407	#endif
408
409	#undef ASMProbeReadByte
410	#pragma aux ASMProbeReadByte = \
411	"mov al, es:[bx]" \
412	parm [es bx] \
413	value [al] \
414	modify exact [al];
415
416	#undef ASMBitSet
417	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
418	# pragma aux ASMBitSet = \
419	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
420	" mov cl, 5" \
421	" shl ch, cl" \
422	" add bh, ch" /* Adjust the pointer. */ \
423	" mov cl, al" \
424	" shr ax, 1" /* convert to byte offset */ \
425	" shr ax, 1" \
426	" shr ax, 1" \
427	" add bx, ax" /* adjust pointer again */\
428	" and cl, 7" \
429	" mov al, 1" \
430	" shl al, cl" /* al=bitmask */ \
431	" or es:[bx], al" \
432	parm [es bx] [ax cx] \
433	modify exact [ax bx cx];
434	#else
435	# pragma aux ASMBitSet = \
436	"shl edx, 16" \
437	"mov dx, ax" \
438	"bts es:[bx], edx" \
439	parm [es bx] [ax dx] \
440	modify exact [dx];
441	#endif
442
443	#undef ASMAtomicBitSet
444	#pragma aux ASMAtomicBitSet = \
445	".386" \
446	"shl edx, 16" \
447	"mov dx, ax" \
448	"lock bts es:[bx], edx" \
449	parm [es bx] [ax dx] \
450	modify exact [dx];
451
452	#undef ASMBitClear
453	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
454	# pragma aux ASMBitClear = \
455	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
456	" mov cl, 5" \
457	" shl ch, cl" \
458	" add bh, ch" /* Adjust the pointer. */ \
459	" mov cl, al" \
460	" shr ax, 1" /* convert to byte offset */ \
461	" shr ax, 1" \
462	" shr ax, 1" \
463	" add bx, ax" /* adjust pointer again */\
464	" and cl, 7" \
465	" mov al, 1" \
466	" shl al, cl" \
467	" not al" /* al=bitmask */ \
468	" and es:[bx], al" \
469	parm [es bx] [ax cx] \
470	modify exact [ax bx cx];
471	#else
472	# pragma aux ASMBitClear = \
473	"shl edx, 16" \
474	"mov dx, ax" \
475	"btr es:[bx], edx" \
476	parm [es bx] [ax dx] \
477	modify exact [dx];
478	#endif
479
480	#undef ASMAtomicBitClear
481	#pragma aux ASMAtomicBitClear = \
482	".386" \
483	"shl edx, 16" \
484	"mov dx, ax" \
485	"lock btr es:[bx], edx" \
486	parm [es bx] [ax dx] \
487	modify exact [dx];
488
489	#undef ASMBitToggle
490	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
491	# pragma aux ASMBitToggle = \
492	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
493	" mov cl, 5" \
494	" shl ch, cl" \
495	" add bh, ch" /* Adjust the pointer. */ \
496	" mov cl, al" \
497	" shr ax, 1" /* convert to byte offset */ \
498	" shr ax, 1" \
499	" shr ax, 1" \
500	" add bx, ax" /* adjust pointer again */\
501	" and cl, 7" \
502	" mov al, 1" \
503	" shl al, cl" /* al=bitmask */ \
504	" xor es:[bx], al" \
505	parm [es bx] [ax cx] \
506	modify exact [ax bx cx];
507	#else
508	# pragma aux ASMBitToggle = \
509	"shl edx, 16" \
510	"mov dx, ax" \
511	"btc es:[bx], edx" \
512	parm [es bx] [ax dx] \
513	modify exact [dx];
514	#endif
515
516	#undef ASMAtomicBitToggle
517	#pragma aux ASMAtomicBitToggle = \
518	".386" \
519	"shl edx, 16" \
520	"mov dx, ax" \
521	"lock btc es:[bx], edx" \
522	parm [es bx] [ax dx] \
523	modify exact [dx];
524
525	#undef ASMBitTestAndSet
526	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
527	# pragma aux ASMBitTestAndSet = \
528	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
529	" mov cl, 5" \
530	" shl ch, cl" \
531	" add bh, ch" /* Adjust the pointer. */ \
532	" mov cl, al" \
533	" shr ax, 1" /* convert to byte offset */ \
534	" shr ax, 1" \
535	" shr ax, 1" \
536	" add bx, ax" /* adjust pointer again */\
537	" and cl, 7" /* cl=byte shift count */ \
538	" mov ah, 1" \
539	" shl ah, cl" /* ah=bitmask */ \
540	" mov al, es:[bx]" \
541	" or ah, al" \
542	" mov es:[bx], ah" \
543	" shr al, cl" \
544	" and al, 1" \
545	parm [es bx] [ax cx] \
546	value [al] \
547	modify exact [ax bx cx];
548	#else
549	# pragma aux ASMBitTestAndSet = \
550	"shl edx, 16" \
551	"mov dx, ax" \
552	"bts es:[bx], edx" \
553	"setc al" \
554	parm [es bx] [ax dx] \
555	value [al] \
556	modify exact [ax dx];
557	#endif
558
559	#undef ASMAtomicBitTestAndSet
560	#pragma aux ASMAtomicBitTestAndSet = \
561	".386" \
562	"shl edx, 16" \
563	"mov dx, ax" \
564	"lock bts es:[bx], edx" \
565	"setc al" \
566	parm [es bx] [ax dx] \
567	value [al] \
568	modify exact [ax dx];
569
570	#undef ASMBitTestAndClear
571	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
572	# pragma aux ASMBitTestAndClear = \
573	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
574	" mov cl, 5" \
575	" shl ch, cl" \
576	" add bh, ch" /* Adjust the pointer. */ \
577	" mov cl, al" \
578	" shr ax, 1" /* convert to byte offset */ \
579	" shr ax, 1" \
580	" shr ax, 1" \
581	" add bx, ax" /* adjust pointer again */\
582	" and cl, 7" /* cl=byte shift count */ \
583	" mov ah, 1" \
584	" shl ah, cl" \
585	" not ah" /* ah=bitmask */ \
586	" mov al, es:[bx]" \
587	" and ah, al" \
588	" mov es:[bx], ah" \
589	" shr al, cl" \
590	" and al, 1" \
591	parm [es bx] [ax cx] \
592	value [al] \
593	modify exact [ax bx cx];
594	#else
595	# pragma aux ASMBitTestAndClear = \
596	"shl edx, 16" \
597	"mov dx, ax" \
598	"btr es:[bx], edx" \
599	"setc al" \
600	parm [es bx] [ax dx] \
601	value [al] \
602	modify exact [ax dx];
603	#endif
604
605	#undef ASMAtomicBitTestAndClear
606	#pragma aux ASMAtomicBitTestAndClear = \
607	".386" \
608	"shl edx, 16" \
609	"mov dx, ax" \
610	"lock btr es:[bx], edx" \
611	"setc al" \
612	parm [es bx] [ax dx] \
613	value [al] \
614	modify exact [ax dx];
615
616	#undef ASMBitTestAndToggle
617	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
618	# pragma aux ASMBitTestAndToggle = \
619	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
620	" mov cl, 5" \
621	" shl ch, cl" \
622	" add bh, ch" /* Adjust the pointer. */ \
623	" mov cl, al" \
624	" shr ax, 1" /* convert to byte offset */ \
625	" shr ax, 1" \
626	" shr ax, 1" \
627	" add bx, ax" /* adjust pointer again */\
628	" and cl, 7" /* cl=byte shift count */ \
629	" mov ah, 1" \
630	" shl ah, cl" /* ah=bitmask */ \
631	" mov al, es:[bx]" \
632	" xor ah, al" \
633	" mov es:[bx], ah" \
634	" shr al, cl" \
635	" and al, 1" \
636	parm [es bx] [ax cx] \
637	value [al] \
638	modify exact [ax bx cx];
639	#else
640	# pragma aux ASMBitTestAndToggle = \
641	"shl edx, 16" \
642	"mov dx, ax" \
643	"btc es:[bx], edx" \
644	"setc al" \
645	parm [es bx] [ax dx] \
646	value [al] \
647	modify exact [ax dx];
648	#endif
649
650	#undef ASMAtomicBitTestAndToggle
651	#pragma aux ASMAtomicBitTestAndToggle = \
652	".386" \
653	"shl edx, 16" \
654	"mov dx, ax" \
655	"lock btc es:[bx], edx" \
656	"setc al" \
657	parm [es bx] [ax dx] \
658	value [al] \
659	modify exact [ax dx];
660
661	#undef ASMBitTest
662	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
663	# pragma aux ASMBitTest = \
664	" mov ch, cl" /* Only the three lowest bits are relevant due to 64KB segments */ \
665	" mov cl, 5" \
666	" shl ch, cl" \
667	" add bh, ch" /* Adjust the pointer. */ \
668	" mov cl, al" \
669	" shr ax, 1" /* convert to byte offset */ \
670	" shr ax, 1" \
671	" shr ax, 1" \
672	" add bx, ax" /* adjust pointer again */\
673	" and cl, 7" \
674	" mov al, es:[bx]" \
675	" shr al, cl" \
676	" and al, 1" \
677	parm [es bx] [ax cx] \
678	value [al] \
679	modify exact [ax bx cx];
680	#else
681	# pragma aux ASMBitTest = \
682	"shl edx, 16" \
683	"mov dx, ax" \
684	"bt es:[bx], edx" \
685	"setc al" \
686	parm [es bx] [ax dx] nomemory \
687	value [al] \
688	modify exact [ax dx] nomemory;
689	#endif
690
691	/* ASMBitFirstClear: External file. */
692	/* ASMBitNextClear: External file. */
693	/* ASMBitFirstSet: External file. */
694	/* ASMBitNextSet: External file. */
695
696	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
697	/* ASMBitFirstSetU32: External file. */
698	#else
699	# undef ASMBitFirstSetU32
700	# pragma aux ASMBitFirstSetU32 = \
701	"shl edx, 16" \
702	"mov dx, ax" \
703	"bsf eax, edx" \
704	"jz not_found" \
705	"inc ax" \
706	"jmp done" \
707	"not_found:" \
708	"xor ax, ax" \
709	"done:" \
710	parm [ax dx] nomemory \
711	value [ax] \
712	modify exact [ax dx] nomemory;
713	#endif
714
715	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
716	/* ASMBitFirstSetU64: External file. */
717	#else
718	# undef ASMBitFirstSetU64
719	# pragma aux ASMBitFirstSetU64 = \
720	".386" \
721	"shl ecx, 16" \
722	"mov cx, dx" \
723	"bsf ecx, ecx" \
724	"jz not_found_low" \
725	"mov ax, cx" \
726	"inc ax" \
727	"jmp done" \
728	\
729	"not_found_low:" \
730	"shr eax, 16" \
731	"mov ax, bx" \
732	"bsf eax, eax" \
733	"jz not_found_high" \
734	"add ax, 33" \
735	"jmp done" \
736	\
737	"not_found_high:" \
738	"xor ax, ax" \
739	"done:" \
740	parm [dx cx bx ax] nomemory \
741	value [ax] \
742	modify exact [ax cx] nomemory;
743	#endif
744
745	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
746	/* ASMBitFirstSetU16: External file. */
747	#else
748	# undef ASMBitFirstSetU16
749	# pragma aux ASMBitFirstSetU16 = \
750	"bsf ax, ax" \
751	"jz not_found" \
752	"inc ax" \
753	"jmp done" \
754	"not_found:" \
755	"xor ax, ax" \
756	"done:" \
757	parm [ax] nomemory \
758	value [ax] \
759	modify exact [ax] nomemory;
760	#endif
761
762	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
763	/* ASMBitLastSetU32: External file. */
764	#else
765	# undef ASMBitLastSetU32
766	# pragma aux ASMBitLastSetU32 = \
767	"shl edx, 16" \
768	"mov dx, ax" \
769	"bsr eax, edx" \
770	"jz not_found" \
771	"inc ax" \
772	"jmp done" \
773	"not_found:" \
774	"xor ax, ax" \
775	"done:" \
776	parm [ax dx] nomemory \
777	value [ax] \
778	modify exact [ax dx] nomemory;
779	#endif
780
781	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
782	/* ASMBitLastSetU64: External file. */
783	#else
784	# undef ASMBitLastSetU64
785	# pragma aux ASMBitLastSetU64 = \
786	".386" \
787	"shl ecx, 16" \
788	"mov cx, dx" \
789	"bsf ecx, ecx" \
790	"jz not_found_low" \
791	"mov ax, cx" \
792	"inc ax" \
793	"jmp done" \
794	\
795	"not_found_low:" \
796	"shr eax, 16" \
797	"mov ax, bx" \
798	"bsf eax, eax" \
799	"jz not_found_high" \
800	"add ax, 33" \
801	"jmp done" \
802	\
803	"not_found_high:" \
804	"xor ax, ax" \
805	"done:" \
806	parm [dx cx bx ax] nomemory \
807	value [ax] \
808	modify exact [ax cx] nomemory;
809	#endif
810
811	#if defined(__SW_0) \|\| defined(__SW_1) \|\| defined(__SW_2)
812	/* ASMBitLastSetU16: External file. */
813	#else
814	# undef ASMBitLastSetU16
815	# pragma aux ASMBitLastSetU16 = \
816	"bsr ax, ax" \
817	"jz not_found" \
818	"inc ax" \
819	"jmp done" \
820	"not_found:" \
821	"xor ax, ax" \
822	"done:" \
823	parm [ax] nomemory \
824	value [ax] \
825	modify exact [ax] nomemory;
826	#endif
827
828	#undef ASMByteSwapU16
829	#pragma aux ASMByteSwapU16 = \
830	"xchg al, ah" \
831	parm [ax] nomemory \
832	value [ax] \
833	modify exact [ax] nomemory;
834
835	#undef ASMByteSwapU32
836	#pragma aux ASMByteSwapU32 = \
837	"xchg dh, al" \
838	"xchg dl, ah" \
839	parm [ax dx] nomemory \
840	value [ax dx] \
841	modify exact [ax dx] nomemory;
842
843	#undef ASMRotateLeftU32
844	#pragma aux ASMRotateLeftU32 = \
845	".386" \
846	"shl edx, 16" \
847	"mov dx, ax" \
848	"rol edx, cl" \
849	"mov eax, edx" \
850	"shr edx, 16" \
851	parm [ax dx] [cx] nomemory \
852	value [ax dx] \
853	modify exact [ax dx] nomemory;
854
855	#undef ASMRotateRightU32
856	#pragma aux ASMRotateRightU32 = \
857	".386" \
858	"shl edx, 16" \
859	"mov dx, ax" \
860	"ror edx, cl" \
861	"mov eax, edx" \
862	"shr edx, 16" \
863	parm [ax dx] [cx] nomemory \
864	value [ax dx] \
865	modify exact [ax dx] nomemory;
866
867	#endif

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source: vbox/trunk/include/iprt/asm-watcom-x86-16.h@ 69010

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