aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/math-emu/fp_scan.S
blob: e4146ed574db92c2ffe31734f6f9c71c346a2177 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
/*
 * fp_scan.S
 *
 * Copyright Roman Zippel, 1997.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * ALTERNATIVELY, this product may be distributed under the terms of
 * the GNU General Public License, in which case the provisions of the GPL are
 * required INSTEAD OF the above restrictions.  (This clause is
 * necessary due to a potential bad interaction between the GPL and
 * the restrictions contained in a BSD-style copyright.)
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "fp_emu.h"
#include "fp_decode.h"

	.globl	fp_scan, fp_datasize

	.data

| %d2 - first two instr words
| %d1 - operand size

/* operand formats are:

	Long = 0,		i.e. fmove.l
	Single,			i.e. fmove.s
	Extended,		i.e. fmove.x
	Packed-BCD,		i.e. fmove.p
	Word,			i.e. fmove.w
	Double,			i.e. fmove.d
*/

	.text

| On entry:
| FPDATA - base of emulated FPU registers

fp_scan:
| normal fpu instruction? (this excludes fsave/frestore)
	fp_get_pc %a0
	printf	PDECODE,"%08x: ",1,%a0
	getuser.b (%a0),%d0,fp_err_ua1,%a0
#if 1
	cmp.b	#0xf2,%d0		| cpid = 1
#else
	cmp.b	#0xfc,%d0		| cpid = 6
#endif
	jne	fp_nonstd
| first two instruction words are kept in %d2
	getuser.l (%a0)+,%d2,fp_err_ua1,%a0
	fp_put_pc %a0
fp_decode_cond:				| separate conditional instr
	fp_decode_cond_instr_type

	.long	fp_decode_move, fp_fscc
	.long	fp_fbccw, fp_fbccl

fp_decode_move:				| separate move instr
	fp_decode_move_instr_type

	.long	fp_fgen_fp, fp_ill
	.long	fp_fgen_ea, fp_fmove_fp2mem
	.long	fp_fmovem_cr, fp_fmovem_cr
	.long	fp_fmovem_fp, fp_fmovem_fp

| now all arithmetic instr and a few move instr are left
fp_fgen_fp:				| source is a fpu register
	clr.b	(FPD_FPSR+2,FPDATA)	| clear the exception byte
	fp_decode_sourcespec
	printf	PDECODE,"f<op>.x fp%d",1,%d0
	fp_get_fp_reg
	lea	(FPD_TEMPFP1,FPDATA),%a1 | copy src into a temp location
	move.l	(%a0)+,(%a1)+
	move.l	(%a0)+,(%a1)+
	move.l	(%a0),(%a1)
	lea	(-8,%a1),%a0
	jra	fp_getdest

fp_fgen_ea:				| source is <ea>
	clr.b	(FPD_FPSR+2,FPDATA)	| clear the exception byte
	| sort out fmovecr, keep data size in %d1
	fp_decode_sourcespec
	cmp.w	#7,%d0
	jeq	fp_fmovecr
	move.w	%d0,%d1			| store data size twice in %d1
	swap	%d1			| one can be trashed below
	move.w	%d0,%d1
#ifdef FPU_EMU_DEBUG
	lea	0f,%a0
	clr.l	%d0
	move.b	(%a0,%d1.w),%d0
	printf	PDECODE,"f<op>.%c ",1,%d0

	.data
0:	.byte	'l','s','x','p','w','d','b',0
	.previous
#endif

/*
	fp_getsource, fp_getdest

	basically, we end up with a pointer to the source operand in
	%a1, and a pointer to the destination operand in %a0.  both
	are, of course, 96-bit extended floating point numbers.
*/

fp_getsource:
	| decode addressing mode for source
	fp_decode_addr_mode

	.long	fp_data, fp_ill
	.long	fp_indirect, fp_postinc
	.long	fp_predecr, fp_disp16
	.long	fp_extmode0, fp_extmode1

	| addressing mode: data register direct
fp_data:
	fp_mode_data_direct
	jsr	fp_get_data_reg
	lea	(FPD_TEMPFP1,FPDATA),%a0
	jmp	([0f:w,%pc,%d1.w*4])

	.align	4
0:
	.long	fp_data_long, fp_data_single
	.long	fp_ill, fp_ill
	.long	fp_data_word, fp_ill
	.long	fp_data_byte, fp_ill

	| data types that fit in an integer data register
fp_data_byte:
	extb.l	%d0
	jra	fp_data_long

fp_data_word:
	ext.l	%d0

fp_data_long:
	jsr	fp_conv_long2ext
	jra	fp_getdest

fp_data_single:
	jsr	fp_conv_single2ext
	jra	fp_getdest

	| addressing mode: address register indirect
fp_indirect:
	fp_mode_addr_indirect
	jra	fp_fetchsource

	| addressing mode: address register indirect with postincrement
fp_postinc:
	fp_mode_addr_indirect_postinc
	jra	fp_fetchsource

	| addressing mode: address register indirect with predecrement
fp_predecr:
	fp_mode_addr_indirect_predec
	jra	fp_fetchsource

	| addressing mode: address register/programm counter indirect
	|		   with 16bit displacement
fp_disp16:
	fp_mode_addr_indirect_disp16
	jra	fp_fetchsource

	| all other indirect addressing modes will finally end up here
fp_extmode0:
	fp_mode_addr_indirect_extmode0
	jra	fp_fetchsource

| all pc relative addressing modes and immediate/absolute modes end up here
| the first ones are sent to fp_extmode0 or fp_disp16
| and only the latter are handled here
fp_extmode1:
	fp_decode_addr_reg
	jmp	([0f:w,%pc,%d0*4])

	.align	4
0:
	.long	fp_abs_short, fp_abs_long
	.long	fp_disp16, fp_extmode0
	.long	fp_immediate, fp_ill
	.long	fp_ill, fp_ill

	| addressing mode: absolute short
fp_abs_short:
	fp_mode_abs_short
	jra	fp_fetchsource

	| addressing mode: absolute long
fp_abs_long:
	fp_mode_abs_long
	jra	fp_fetchsource

	| addressing mode: immediate data
fp_immediate:
	printf	PDECODE,"#"
	fp_get_pc %a0
	move.w	(fp_datasize,%d1.w*2),%d0
	addq.w	#1,%d0
	and.w	#-2,%d0
#ifdef FPU_EMU_DEBUG
	movem.l	%d0/%d1,-(%sp)
	movel	%a0,%a1
	clr.l	%d1
	jra	2f
1:	getuser.b (%a1)+,%d1,fp_err_ua1,%a1
	printf	PDECODE,"%02x",1,%d1
2:	dbra	%d0,1b
	movem.l	(%sp)+,%d0/%d1
#endif
	lea	(%a0,%d0.w),%a1
	fp_put_pc %a1
|	jra	fp_fetchsource

fp_fetchsource:
	move.l	%a0,%a1
	swap	%d1
	lea	(FPD_TEMPFP1,FPDATA),%a0
	jmp	([0f:w,%pc,%d1.w*4])

	.align	4
0:	.long	fp_long, fp_single
	.long	fp_ext, fp_pack
	.long	fp_word, fp_double
	.long	fp_byte, fp_ill

fp_long:
	getuser.l (%a1),%d0,fp_err_ua1,%a1
	jsr	fp_conv_long2ext
	jra	fp_getdest

fp_single:
	getuser.l (%a1),%d0,fp_err_ua1,%a1
	jsr	fp_conv_single2ext
	jra	fp_getdest

fp_ext:
	getuser.l (%a1)+,%d0,fp_err_ua1,%a1
	lsr.l	#8,%d0
	lsr.l	#7,%d0
	lsr.w	#1,%d0
	move.l	%d0,(%a0)+
	getuser.l (%a1)+,%d0,fp_err_ua1,%a1
	move.l	%d0,(%a0)+
	getuser.l (%a1),%d0,fp_err_ua1,%a1
	move.l	%d0,(%a0)
	subq.l	#8,%a0
	jra	fp_getdest

fp_pack:
	/* not supported yet */
	jra	fp_ill

fp_word:
	getuser.w (%a1),%d0,fp_err_ua1,%a1
	ext.l	%d0
	jsr	fp_conv_long2ext
	jra	fp_getdest

fp_double:
	jsr	fp_conv_double2ext
	jra	fp_getdest

fp_byte:
	getuser.b (%a1),%d0,fp_err_ua1,%a1
	extb.l	%d0
	jsr	fp_conv_long2ext
|	jra	fp_getdest

fp_getdest:
	move.l	%a0,%a1
	bfextu	%d2{#22,#3},%d0
	printf	PDECODE,",fp%d\n",1,%d0
	fp_get_fp_reg
	movem.l	%a0/%a1,-(%sp)
	pea	fp_finalrounding
	bfextu	%d2{#25,#7},%d0
	jmp	([0f:w,%pc,%d0*4])

	.align	4
0:
	.long	fp_fmove_mem2fp, fp_fint, fp_fsinh, fp_fintrz
	.long	fp_fsqrt, fp_ill, fp_flognp1, fp_ill
	.long	fp_fetoxm1, fp_ftanh, fp_fatan, fp_ill
	.long	fp_fasin, fp_fatanh, fp_fsin, fp_ftan
	.long	fp_fetox, fp_ftwotox, fp_ftentox, fp_ill
	.long	fp_flogn, fp_flog10, fp_flog2, fp_ill
	.long	fp_fabs, fp_fcosh, fp_fneg, fp_ill
	.long	fp_facos, fp_fcos, fp_fgetexp, fp_fgetman
	.long	fp_fdiv, fp_fmod, fp_fadd, fp_fmul
	.long	fpa_fsgldiv, fp_frem, fp_fscale, fpa_fsglmul
	.long	fp_fsub, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_fsincos0, fp_fsincos1, fp_fsincos2, fp_fsincos3
	.long	fp_fsincos4, fp_fsincos5, fp_fsincos6, fp_fsincos7
	.long	fp_fcmp, fp_ill, fp_ftst, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_fsmove, fp_fssqrt, fp_ill, fp_ill
	.long	fp_fdmove, fp_fdsqrt, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_fsabs, fp_ill, fp_fsneg, fp_ill
	.long	fp_fdabs, fp_ill, fp_fdneg, fp_ill
	.long	fp_fsdiv, fp_ill, fp_fsadd, fp_fsmul
	.long	fp_fddiv, fp_ill, fp_fdadd, fp_fdmul
	.long	fp_fssub, fp_ill, fp_ill, fp_ill
	.long	fp_fdsub, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill
	.long	fp_ill, fp_ill, fp_ill, fp_ill

	| Instructions follow

	| Move an (emulated) ROM constant
fp_fmovecr:
	bfextu	%d2{#27,#5},%d0
	printf	PINSTR,"fp_fmovecr #%d",1,%d0
	move.l	%d0,%d1
	add.l	%d0,%d0
	add.l	%d1,%d0
	lea	(fp_constants,%d0*4),%a0
	move.l	#0x801cc0ff,%d0
	addq.l	#1,%d1
	lsl.l	%d1,%d0
	jcc	1f
	fp_set_sr FPSR_EXC_INEX2			| INEX2 exception
1:	moveq	#-128,%d0				| continue with fmove
	and.l	%d0,%d2
	jra	fp_getdest

	.data
	.align	4
fp_constants:
	.long	0x00004000,0xc90fdaa2,0x2168c235	| pi
	.extend	0,0,0,0,0,0,0,0,0,0
	.long	0x00003ffd,0x9a209a84,0xfbcff798	| log10(2)
	.long	0x00004000,0xadf85458,0xa2bb4a9a	| e
	.long	0x00003fff,0xb8aa3b29,0x5c17f0bc	| log2(e)
	.long	0x00003ffd,0xde5bd8a9,0x37287195	| log10(e)
	.long	0x00000000,0x00000000,0x00000000	| 0.0
	.long	0x00003ffe,0xb17217f7,0xd1cf79ac	| 1n(2)
	.long	0x00004000,0x935d8ddd,0xaaa8ac17	| 1n(10)
	| read this as "1.0 * 2^0" - note the high bit in the mantissa
	.long	0x00003fff,0x80000000,0x00000000	| 10^0
	.long	0x00004002,0xa0000000,0x00000000	| 10^1
	.long	0x00004005,0xc8000000,0x00000000	| 10^2
	.long	0x0000400c,0x9c400000,0x00000000	| 10^4
	.long	0x00004019,0xbebc2000,0x00000000	| 10^8
	.long	0x00004034,0x8e1bc9bf,0x04000000	| 10^16
	.long	0x00004069,0x9dc5ada8,0x2b70b59e	| 10^32
	.long	0x000040d3,0xc2781f49,0xffcfa6d5	| 10^64
	.long	0x000041a8,0x93ba47c9,0x80e98ce0	| 10^128
	.long	0x00004351,0xaa7eebfb,0x9df9de8e	| 10^256
	.long	0x000046a3,0xe319a0ae,0xa60e91c7	| 10^512
	.long	0x00004d48,0xc9767586,0x81750c17	| 10^1024
	.long	0x00005a92,0x9e8b3b5d,0xc53d5de5	| 10^2048
	.long	0x00007525,0xc4605202,0x8a20979b	| 10^4096
	.previous

fp_fmove_mem2fp:
	printf	PINSTR,"fmove %p,%p\n",2,%a0,%a1
	move.l	(%a1)+,(%a0)+
	move.l	(%a1)+,(%a0)+
	move.l	(%a1),(%a0)
	subq.l	#8,%a0
	rts

fpa_fsglmul:
	move.l	#fp_finalrounding_single_fast,(%sp)
	jra	fp_fsglmul

fpa_fsgldiv:
	move.l	#fp_finalrounding_single_fast,(%sp)
	jra	fp_fsgldiv

.macro	fp_dosingleprec instr
	printf	PINSTR,"single "
	move.l	#fp_finalrounding_single,(%sp)
	jra	\instr
.endm

.macro	fp_dodoubleprec instr
	printf	PINSTR,"double "
	move.l	#fp_finalrounding_double,(%sp)
	jra	\instr
.endm

fp_fsmove:
	fp_dosingleprec fp_fmove_mem2fp

fp_fssqrt:
	fp_dosingleprec fp_fsqrt

fp_fdmove:
	fp_dodoubleprec fp_fmove_mem2fp

fp_fdsqrt:
	fp_dodoubleprec fp_fsqrt

fp_fsabs:
	fp_dosingleprec fp_fabs

fp_fsneg:
	fp_dosingleprec fp_fneg

fp_fdabs:
	fp_dodoubleprec fp_fabs

fp_fdneg:
	fp_dodoubleprec fp_fneg

fp_fsdiv:
	fp_dosingleprec fp_fdiv

fp_fsadd:
	fp_dosingleprec fp_fadd

fp_fsmul:
	fp_dosingleprec fp_fmul

fp_fddiv:
	fp_dodoubleprec fp_fdiv

fp_fdadd:
	fp_dodoubleprec fp_fadd

fp_fdmul:
	fp_dodoubleprec fp_fmul

fp_fssub:
	fp_dosingleprec fp_fsub

fp_fdsub:
	fp_dodoubleprec fp_fsub

fp_nonstd:
	fp_get_pc %a0
	getuser.l (%a0),%d0,fp_err_ua1,%a0
	printf	,"nonstd ((%08x)=%08x)\n",2,%a0,%d0
	moveq	#-1,%d0
	rts

	.data
	.align	4

	| data sizes corresponding to the operand formats
fp_datasize:
	.word	4, 4, 12, 12, 2, 8, 1, 0