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[hh.org.git] / arch / parisc / math-emu / fpudispatch.c
blob6e28f9f4c620fb94fb9d8910c51c6471173c0cee
1 /*
2 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
3 *
4 * Floating-point emulation code
5 * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 /*
22 * BEGIN_DESC
23 *
24 * File:
25 * @(#) pa/fp/fpudispatch.c $Revision: 1.1 $
26 *
27 * Purpose:
28 * <<please update with a synopsis of the functionality provided by this file>>
29 *
30 * External Interfaces:
31 * <<the following list was autogenerated, please review>>
32 * emfpudispatch(ir, dummy1, dummy2, fpregs)
33 * fpudispatch(ir, excp_code, holder, fpregs)
34 *
35 * Internal Interfaces:
36 * <<the following list was autogenerated, please review>>
37 * static u_int decode_06(u_int, u_int *)
38 * static u_int decode_0c(u_int, u_int, u_int, u_int *)
39 * static u_int decode_0e(u_int, u_int, u_int, u_int *)
40 * static u_int decode_26(u_int, u_int *)
41 * static u_int decode_2e(u_int, u_int *)
42 * static void update_status_cbit(u_int *, u_int, u_int, u_int)
43 *
44 * Theory:
45 * <<please update with a overview of the operation of this file>>
46 *
47 * END_DESC
48 */
49
50 #define FPUDEBUG 0
51
52 #include "float.h"
53 #include <linux/kernel.h>
54 #include <asm/processor.h>
55 /* #include <sys/debug.h> */
56 /* #include <machine/sys/mdep_private.h> */
57
58 #define COPR_INST 0x30000000
59
60 /*
61 * definition of extru macro. If pos and len are constants, the compiler
62 * will generate an extru instruction when optimized
63 */
64 #define extru(r,pos,len) (((r) >> (31-(pos))) & (( 1 << (len)) - 1))
65 /* definitions of bit field locations in the instruction */
66 #define fpmajorpos 5
67 #define fpr1pos 10
68 #define fpr2pos 15
69 #define fptpos 31
70 #define fpsubpos 18
71 #define fpclass1subpos 16
72 #define fpclasspos 22
73 #define fpfmtpos 20
74 #define fpdfpos 18
75 #define fpnulpos 26
76 /*
77 * the following are the extra bits for the 0E major op
78 */
79 #define fpxr1pos 24
80 #define fpxr2pos 19
81 #define fpxtpos 25
82 #define fpxpos 23
83 #define fp0efmtpos 20
84 /*
85 * the following are for the multi-ops
86 */
87 #define fprm1pos 10
88 #define fprm2pos 15
89 #define fptmpos 31
90 #define fprapos 25
91 #define fptapos 20
92 #define fpmultifmt 26
93 /*
94 * the following are for the fused FP instructions
95 */
96 /* fprm1pos 10 */
97 /* fprm2pos 15 */
98 #define fpraupos 18
99 #define fpxrm2pos 19
100 /* fpfmtpos 20 */
101 #define fpralpos 23
102 #define fpxrm1pos 24
103 /* fpxtpos 25 */
104 #define fpfusedsubop 26
105 /* fptpos 31 */
106
107 /*
108 * offset to constant zero in the FP emulation registers
109 */
110 #define fpzeroreg (32*sizeof(double)/sizeof(u_int))
111
112 /*
113 * extract the major opcode from the instruction
114 */
115 #define get_major(op) extru(op,fpmajorpos,6)
116 /*
117 * extract the two bit class field from the FP instruction. The class is at bit
118 * positions 21-22
119 */
120 #define get_class(op) extru(op,fpclasspos,2)
121 /*
122 * extract the 3 bit subop field. For all but class 1 instructions, it is
123 * located at bit positions 16-18
124 */
125 #define get_subop(op) extru(op,fpsubpos,3)
126 /*
127 * extract the 2 or 3 bit subop field from class 1 instructions. It is located
128 * at bit positions 15-16 (PA1.1) or 14-16 (PA2.0)
129 */
130 #define get_subop1_PA1_1(op) extru(op,fpclass1subpos,2) /* PA89 (1.1) fmt */
131 #define get_subop1_PA2_0(op) extru(op,fpclass1subpos,3) /* PA 2.0 fmt */
132
133 /* definitions of unimplemented exceptions */
134 #define MAJOR_0C_EXCP 0x09
135 #define MAJOR_0E_EXCP 0x0b
136 #define MAJOR_06_EXCP 0x03
137 #define MAJOR_26_EXCP 0x23
138 #define MAJOR_2E_EXCP 0x2b
139 #define PA83_UNIMP_EXCP 0x01
140
141 /*
142 * Special Defines for TIMEX specific code
143 */
144
145 #define FPU_TYPE_FLAG_POS (EM_FPU_TYPE_OFFSET>>2)
146 #define TIMEX_ROLEX_FPU_MASK (TIMEX_EXTEN_FLAG|ROLEX_EXTEN_FLAG)
147
148 /*
149 * Static function definitions
150 */
151 #define _PROTOTYPES
152 #if defined(_PROTOTYPES) || defined(_lint)
153 static u_int decode_0c(u_int, u_int, u_int, u_int *);
154 static u_int decode_0e(u_int, u_int, u_int, u_int *);
155 static u_int decode_06(u_int, u_int *);
156 static u_int decode_26(u_int, u_int *);
157 static u_int decode_2e(u_int, u_int *);
158 static void update_status_cbit(u_int *, u_int, u_int, u_int);
159 #else /* !_PROTOTYPES&&!_lint */
160 static u_int decode_0c();
161 static u_int decode_0e();
162 static u_int decode_06();
163 static u_int decode_26();
164 static u_int decode_2e();
165 static void update_status_cbit();
166 #endif /* _PROTOTYPES&&!_lint */
167
168 #define VASSERT(x)
169
170 static void parisc_linux_get_fpu_type(u_int fpregs[])
171 {
172 /* on pa-linux the fpu type is not filled in by the
173 * caller; it is constructed here
174 */
175 if (boot_cpu_data.cpu_type == pcxs)
176 fpregs[FPU_TYPE_FLAG_POS] = TIMEX_EXTEN_FLAG;
177 else if (boot_cpu_data.cpu_type == pcxt ||
178 boot_cpu_data.cpu_type == pcxt_)
179 fpregs[FPU_TYPE_FLAG_POS] = ROLEX_EXTEN_FLAG;
180 else if (boot_cpu_data.cpu_type >= pcxu)
181 fpregs[FPU_TYPE_FLAG_POS] = PA2_0_FPU_FLAG;
182 }
183
184 /*
185 * this routine will decode the excepting floating point instruction and
186 * call the approiate emulation routine.
187 * It is called by decode_fpu with the following parameters:
188 * fpudispatch(current_ir, unimplemented_code, 0, &Fpu_register)
189 * where current_ir is the instruction to be emulated,
190 * unimplemented_code is the exception_code that the hardware generated
191 * and &Fpu_register is the address of emulated FP reg 0.
192 */
193 u_int
194 fpudispatch(u_int ir, u_int excp_code, u_int holder, u_int fpregs[])
195 {
196 u_int class, subop;
197 u_int fpu_type_flags;
198
199 /* All FP emulation code assumes that ints are 4-bytes in length */
200 VASSERT(sizeof(int) == 4);
201
202 parisc_linux_get_fpu_type(fpregs);
203
204 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; /* get fpu type flags */
205
206 class = get_class(ir);
207 if (class == 1) {
208 if (fpu_type_flags & PA2_0_FPU_FLAG)
209 subop = get_subop1_PA2_0(ir);
210 else
211 subop = get_subop1_PA1_1(ir);
212 }
213 else
214 subop = get_subop(ir);
215
216 if (FPUDEBUG) printk("class %d subop %d\n", class, subop);
217
218 switch (excp_code) {
219 case MAJOR_0C_EXCP:
220 case PA83_UNIMP_EXCP:
221 return(decode_0c(ir,class,subop,fpregs));
222 case MAJOR_0E_EXCP:
223 return(decode_0e(ir,class,subop,fpregs));
224 case MAJOR_06_EXCP:
225 return(decode_06(ir,fpregs));
226 case MAJOR_26_EXCP:
227 return(decode_26(ir,fpregs));
228 case MAJOR_2E_EXCP:
229 return(decode_2e(ir,fpregs));
230 default:
231 /* "crashme Night Gallery painting nr 2. (asm_crash.s).
232 * This was fixed for multi-user kernels, but
233 * workstation kernels had a panic here. This allowed
234 * any arbitrary user to panic the kernel by executing
235 * setting the FP exception registers to strange values
236 * and generating an emulation trap. The emulation and
237 * exception code must never be able to panic the
238 * kernel.
239 */
240 return(UNIMPLEMENTEDEXCEPTION);
241 }
242 }
243
244 /*
245 * this routine is called by $emulation_trap to emulate a coprocessor
246 * instruction if one doesn't exist
247 */
248 u_int
249 emfpudispatch(u_int ir, u_int dummy1, u_int dummy2, u_int fpregs[])
250 {
251 u_int class, subop, major;
252 u_int fpu_type_flags;
253
254 /* All FP emulation code assumes that ints are 4-bytes in length */
255 VASSERT(sizeof(int) == 4);
256
257 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; /* get fpu type flags */
258
259 major = get_major(ir);
260 class = get_class(ir);
261 if (class == 1) {
262 if (fpu_type_flags & PA2_0_FPU_FLAG)
263 subop = get_subop1_PA2_0(ir);
264 else
265 subop = get_subop1_PA1_1(ir);
266 }
267 else
268 subop = get_subop(ir);
269 switch (major) {
270 case 0x0C:
271 return(decode_0c(ir,class,subop,fpregs));
272 case 0x0E:
273 return(decode_0e(ir,class,subop,fpregs));
274 case 0x06:
275 return(decode_06(ir,fpregs));
276 case 0x26:
277 return(decode_26(ir,fpregs));
278 case 0x2E:
279 return(decode_2e(ir,fpregs));
280 default:
281 return(PA83_UNIMP_EXCP);
282 }
283 }
284
285
286 static u_int
287 decode_0c(u_int ir, u_int class, u_int subop, u_int fpregs[])
288 {
289 u_int r1,r2,t; /* operand register offsets */
290 u_int fmt; /* also sf for class 1 conversions */
291 u_int df; /* for class 1 conversions */
292 u_int *status;
293 u_int retval, local_status;
294 u_int fpu_type_flags;
295
296 if (ir == COPR_INST) {
297 fpregs[0] = EMULATION_VERSION << 11;
298 return(NOEXCEPTION);
299 }
300 status = &fpregs[0]; /* fp status register */
301 local_status = fpregs[0]; /* and local copy */
302 r1 = extru(ir,fpr1pos,5) * sizeof(double)/sizeof(u_int);
303 if (r1 == 0) /* map fr0 source to constant zero */
304 r1 = fpzeroreg;
305 t = extru(ir,fptpos,5) * sizeof(double)/sizeof(u_int);
306 if (t == 0 && class != 2) /* don't allow fr0 as a dest */
307 return(MAJOR_0C_EXCP);
308 fmt = extru(ir,fpfmtpos,2); /* get fmt completer */
309
310 switch (class) {
311 case 0:
312 switch (subop) {
313 case 0: /* COPR 0,0 emulated above*/
314 case 1:
315 return(MAJOR_0C_EXCP);
316 case 2: /* FCPY */
317 switch (fmt) {
318 case 2: /* illegal */
319 return(MAJOR_0C_EXCP);
320 case 3: /* quad */
321 t &= ~3; /* force to even reg #s */
322 r1 &= ~3;
323 fpregs[t+3] = fpregs[r1+3];
324 fpregs[t+2] = fpregs[r1+2];
325 case 1: /* double */
326 fpregs[t+1] = fpregs[r1+1];
327 case 0: /* single */
328 fpregs[t] = fpregs[r1];
329 return(NOEXCEPTION);
330 }
331 case 3: /* FABS */
332 switch (fmt) {
333 case 2: /* illegal */
334 return(MAJOR_0C_EXCP);
335 case 3: /* quad */
336 t &= ~3; /* force to even reg #s */
337 r1 &= ~3;
338 fpregs[t+3] = fpregs[r1+3];
339 fpregs[t+2] = fpregs[r1+2];
340 case 1: /* double */
341 fpregs[t+1] = fpregs[r1+1];
342 case 0: /* single */
343 /* copy and clear sign bit */
344 fpregs[t] = fpregs[r1] & 0x7fffffff;
345 return(NOEXCEPTION);
346 }
347 case 6: /* FNEG */
348 switch (fmt) {
349 case 2: /* illegal */
350 return(MAJOR_0C_EXCP);
351 case 3: /* quad */
352 t &= ~3; /* force to even reg #s */
353 r1 &= ~3;
354 fpregs[t+3] = fpregs[r1+3];
355 fpregs[t+2] = fpregs[r1+2];
356 case 1: /* double */
357 fpregs[t+1] = fpregs[r1+1];
358 case 0: /* single */
359 /* copy and invert sign bit */
360 fpregs[t] = fpregs[r1] ^ 0x80000000;
361 return(NOEXCEPTION);
362 }
363 case 7: /* FNEGABS */
364 switch (fmt) {
365 case 2: /* illegal */
366 return(MAJOR_0C_EXCP);
367 case 3: /* quad */
368 t &= ~3; /* force to even reg #s */
369 r1 &= ~3;
370 fpregs[t+3] = fpregs[r1+3];
371 fpregs[t+2] = fpregs[r1+2];
372 case 1: /* double */
373 fpregs[t+1] = fpregs[r1+1];
374 case 0: /* single */
375 /* copy and set sign bit */
376 fpregs[t] = fpregs[r1] | 0x80000000;
377 return(NOEXCEPTION);
378 }
379 case 4: /* FSQRT */
380 switch (fmt) {
381 case 0:
382 return(sgl_fsqrt(&fpregs[r1],0,
383 &fpregs[t],status));
384 case 1:
385 return(dbl_fsqrt(&fpregs[r1],0,
386 &fpregs[t],status));
387 case 2:
388 case 3: /* quad not implemented */
389 return(MAJOR_0C_EXCP);
390 }
391 case 5: /* FRND */
392 switch (fmt) {
393 case 0:
394 return(sgl_frnd(&fpregs[r1],0,
395 &fpregs[t],status));
396 case 1:
397 return(dbl_frnd(&fpregs[r1],0,
398 &fpregs[t],status));
399 case 2:
400 case 3: /* quad not implemented */
401 return(MAJOR_0C_EXCP);
402 }
403 } /* end of switch (subop) */
404
405 case 1: /* class 1 */
406 df = extru(ir,fpdfpos,2); /* get dest format */
407 if ((df & 2) || (fmt & 2)) {
408 /*
409 * fmt's 2 and 3 are illegal of not implemented
410 * quad conversions
411 */
412 return(MAJOR_0C_EXCP);
413 }
414 /*
415 * encode source and dest formats into 2 bits.
416 * high bit is source, low bit is dest.
417 * bit = 1 --> double precision
418 */
419 fmt = (fmt << 1) | df;
420 switch (subop) {
421 case 0: /* FCNVFF */
422 switch(fmt) {
423 case 0: /* sgl/sgl */
424 return(MAJOR_0C_EXCP);
425 case 1: /* sgl/dbl */
426 return(sgl_to_dbl_fcnvff(&fpregs[r1],0,
427 &fpregs[t],status));
428 case 2: /* dbl/sgl */
429 return(dbl_to_sgl_fcnvff(&fpregs[r1],0,
430 &fpregs[t],status));
431 case 3: /* dbl/dbl */
432 return(MAJOR_0C_EXCP);
433 }
434 case 1: /* FCNVXF */
435 switch(fmt) {
436 case 0: /* sgl/sgl */
437 return(sgl_to_sgl_fcnvxf(&fpregs[r1],0,
438 &fpregs[t],status));
439 case 1: /* sgl/dbl */
440 return(sgl_to_dbl_fcnvxf(&fpregs[r1],0,
441 &fpregs[t],status));
442 case 2: /* dbl/sgl */
443 return(dbl_to_sgl_fcnvxf(&fpregs[r1],0,
444 &fpregs[t],status));
445 case 3: /* dbl/dbl */
446 return(dbl_to_dbl_fcnvxf(&fpregs[r1],0,
447 &fpregs[t],status));
448 }
449 case 2: /* FCNVFX */
450 switch(fmt) {
451 case 0: /* sgl/sgl */
452 return(sgl_to_sgl_fcnvfx(&fpregs[r1],0,
453 &fpregs[t],status));
454 case 1: /* sgl/dbl */
455 return(sgl_to_dbl_fcnvfx(&fpregs[r1],0,
456 &fpregs[t],status));
457 case 2: /* dbl/sgl */
458 return(dbl_to_sgl_fcnvfx(&fpregs[r1],0,
459 &fpregs[t],status));
460 case 3: /* dbl/dbl */
461 return(dbl_to_dbl_fcnvfx(&fpregs[r1],0,
462 &fpregs[t],status));
463 }
464 case 3: /* FCNVFXT */
465 switch(fmt) {
466 case 0: /* sgl/sgl */
467 return(sgl_to_sgl_fcnvfxt(&fpregs[r1],0,
468 &fpregs[t],status));
469 case 1: /* sgl/dbl */
470 return(sgl_to_dbl_fcnvfxt(&fpregs[r1],0,
471 &fpregs[t],status));
472 case 2: /* dbl/sgl */
473 return(dbl_to_sgl_fcnvfxt(&fpregs[r1],0,
474 &fpregs[t],status));
475 case 3: /* dbl/dbl */
476 return(dbl_to_dbl_fcnvfxt(&fpregs[r1],0,
477 &fpregs[t],status));
478 }
479 case 5: /* FCNVUF (PA2.0 only) */
480 switch(fmt) {
481 case 0: /* sgl/sgl */
482 return(sgl_to_sgl_fcnvuf(&fpregs[r1],0,
483 &fpregs[t],status));
484 case 1: /* sgl/dbl */
485 return(sgl_to_dbl_fcnvuf(&fpregs[r1],0,
486 &fpregs[t],status));
487 case 2: /* dbl/sgl */
488 return(dbl_to_sgl_fcnvuf(&fpregs[r1],0,
489 &fpregs[t],status));
490 case 3: /* dbl/dbl */
491 return(dbl_to_dbl_fcnvuf(&fpregs[r1],0,
492 &fpregs[t],status));
493 }
494 case 6: /* FCNVFU (PA2.0 only) */
495 switch(fmt) {
496 case 0: /* sgl/sgl */
497 return(sgl_to_sgl_fcnvfu(&fpregs[r1],0,
498 &fpregs[t],status));
499 case 1: /* sgl/dbl */
500 return(sgl_to_dbl_fcnvfu(&fpregs[r1],0,
501 &fpregs[t],status));
502 case 2: /* dbl/sgl */
503 return(dbl_to_sgl_fcnvfu(&fpregs[r1],0,
504 &fpregs[t],status));
505 case 3: /* dbl/dbl */
506 return(dbl_to_dbl_fcnvfu(&fpregs[r1],0,
507 &fpregs[t],status));
508 }
509 case 7: /* FCNVFUT (PA2.0 only) */
510 switch(fmt) {
511 case 0: /* sgl/sgl */
512 return(sgl_to_sgl_fcnvfut(&fpregs[r1],0,
513 &fpregs[t],status));
514 case 1: /* sgl/dbl */
515 return(sgl_to_dbl_fcnvfut(&fpregs[r1],0,
516 &fpregs[t],status));
517 case 2: /* dbl/sgl */
518 return(dbl_to_sgl_fcnvfut(&fpregs[r1],0,
519 &fpregs[t],status));
520 case 3: /* dbl/dbl */
521 return(dbl_to_dbl_fcnvfut(&fpregs[r1],0,
522 &fpregs[t],status));
523 }
524 case 4: /* undefined */
525 return(MAJOR_0C_EXCP);
526 } /* end of switch subop */
527
528 case 2: /* class 2 */
529 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];
530 r2 = extru(ir, fpr2pos, 5) * sizeof(double)/sizeof(u_int);
531 if (r2 == 0)
532 r2 = fpzeroreg;
533 if (fpu_type_flags & PA2_0_FPU_FLAG) {
534 /* FTEST if nullify bit set, otherwise FCMP */
535 if (extru(ir, fpnulpos, 1)) { /* FTEST */
536 switch (fmt) {
537 case 0:
538 /*
539 * arg0 is not used
540 * second param is the t field used for
541 * ftest,acc and ftest,rej
542 * third param is the subop (y-field)
543 */
544 BUG();
545 /* Unsupported
546 * return(ftest(0L,extru(ir,fptpos,5),
547 * &fpregs[0],subop));
548 */
549 case 1:
550 case 2:
551 case 3:
552 return(MAJOR_0C_EXCP);
553 }
554 } else { /* FCMP */
555 switch (fmt) {
556 case 0:
557 retval = sgl_fcmp(&fpregs[r1],
558 &fpregs[r2],extru(ir,fptpos,5),
559 &local_status);
560 update_status_cbit(status,local_status,
561 fpu_type_flags, subop);
562 return(retval);
563 case 1:
564 retval = dbl_fcmp(&fpregs[r1],
565 &fpregs[r2],extru(ir,fptpos,5),
566 &local_status);
567 update_status_cbit(status,local_status,
568 fpu_type_flags, subop);
569 return(retval);
570 case 2: /* illegal */
571 case 3: /* quad not implemented */
572 return(MAJOR_0C_EXCP);
573 }
574 }
575 } /* end of if for PA2.0 */
576 else { /* PA1.0 & PA1.1 */
577 switch (subop) {
578 case 2:
579 case 3:
580 case 4:
581 case 5:
582 case 6:
583 case 7:
584 return(MAJOR_0C_EXCP);
585 case 0: /* FCMP */
586 switch (fmt) {
587 case 0:
588 retval = sgl_fcmp(&fpregs[r1],
589 &fpregs[r2],extru(ir,fptpos,5),
590 &local_status);
591 update_status_cbit(status,local_status,
592 fpu_type_flags, subop);
593 return(retval);
594 case 1:
595 retval = dbl_fcmp(&fpregs[r1],
596 &fpregs[r2],extru(ir,fptpos,5),
597 &local_status);
598 update_status_cbit(status,local_status,
599 fpu_type_flags, subop);
600 return(retval);
601 case 2: /* illegal */
602 case 3: /* quad not implemented */
603 return(MAJOR_0C_EXCP);
604 }
605 case 1: /* FTEST */
606 switch (fmt) {
607 case 0:
608 /*
609 * arg0 is not used
610 * second param is the t field used for
611 * ftest,acc and ftest,rej
612 * third param is the subop (y-field)
613 */
614 BUG();
615 /* unsupported
616 * return(ftest(0L,extru(ir,fptpos,5),
617 * &fpregs[0],subop));
618 */
619 case 1:
620 case 2:
621 case 3:
622 return(MAJOR_0C_EXCP);
623 }
624 } /* end of switch subop */
625 } /* end of else for PA1.0 & PA1.1 */
626 case 3: /* class 3 */
627 r2 = extru(ir,fpr2pos,5) * sizeof(double)/sizeof(u_int);
628 if (r2 == 0)
629 r2 = fpzeroreg;
630 switch (subop) {
631 case 5:
632 case 6:
633 case 7:
634 return(MAJOR_0C_EXCP);
635
636 case 0: /* FADD */
637 switch (fmt) {
638 case 0:
639 return(sgl_fadd(&fpregs[r1],&fpregs[r2],
640 &fpregs[t],status));
641 case 1:
642 return(dbl_fadd(&fpregs[r1],&fpregs[r2],
643 &fpregs[t],status));
644 case 2: /* illegal */
645 case 3: /* quad not implemented */
646 return(MAJOR_0C_EXCP);
647 }
648 case 1: /* FSUB */
649 switch (fmt) {
650 case 0:
651 return(sgl_fsub(&fpregs[r1],&fpregs[r2],
652 &fpregs[t],status));
653 case 1:
654 return(dbl_fsub(&fpregs[r1],&fpregs[r2],
655 &fpregs[t],status));
656 case 2: /* illegal */
657 case 3: /* quad not implemented */
658 return(MAJOR_0C_EXCP);
659 }
660 case 2: /* FMPY */
661 switch (fmt) {
662 case 0:
663 return(sgl_fmpy(&fpregs[r1],&fpregs[r2],
664 &fpregs[t],status));
665 case 1:
666 return(dbl_fmpy(&fpregs[r1],&fpregs[r2],
667 &fpregs[t],status));
668 case 2: /* illegal */
669 case 3: /* quad not implemented */
670 return(MAJOR_0C_EXCP);
671 }
672 case 3: /* FDIV */
673 switch (fmt) {
674 case 0:
675 return(sgl_fdiv(&fpregs[r1],&fpregs[r2],
676 &fpregs[t],status));
677 case 1:
678 return(dbl_fdiv(&fpregs[r1],&fpregs[r2],
679 &fpregs[t],status));
680 case 2: /* illegal */
681 case 3: /* quad not implemented */
682 return(MAJOR_0C_EXCP);
683 }
684 case 4: /* FREM */
685 switch (fmt) {
686 case 0:
687 return(sgl_frem(&fpregs[r1],&fpregs[r2],
688 &fpregs[t],status));
689 case 1:
690 return(dbl_frem(&fpregs[r1],&fpregs[r2],
691 &fpregs[t],status));
692 case 2: /* illegal */
693 case 3: /* quad not implemented */
694 return(MAJOR_0C_EXCP);
695 }
696 } /* end of class 3 switch */
697 } /* end of switch(class) */
698
699 /* If we get here, something is really wrong! */
700 return(MAJOR_0C_EXCP);
701 }
702
703 static u_int
704 decode_0e(ir,class,subop,fpregs)
705 u_int ir,class,subop;
706 u_int fpregs[];
707 {
708 u_int r1,r2,t; /* operand register offsets */
709 u_int fmt; /* also sf for class 1 conversions */
710 u_int df; /* dest format for class 1 conversions */
711 u_int *status;
712 u_int retval, local_status;
713 u_int fpu_type_flags;
714
715 status = &fpregs[0];
716 local_status = fpregs[0];
717 r1 = ((extru(ir,fpr1pos,5)<<1)|(extru(ir,fpxr1pos,1)));
718 if (r1 == 0)
719 r1 = fpzeroreg;
720 t = ((extru(ir,fptpos,5)<<1)|(extru(ir,fpxtpos,1)));
721 if (t == 0 && class != 2)
722 return(MAJOR_0E_EXCP);
723 if (class < 2) /* class 0 or 1 has 2 bit fmt */
724 fmt = extru(ir,fpfmtpos,2);
725 else /* class 2 and 3 have 1 bit fmt */
726 fmt = extru(ir,fp0efmtpos,1);
727 /*
728 * An undefined combination, double precision accessing the
729 * right half of a FPR, can get us into trouble.
730 * Let's just force proper alignment on it.
731 */
732 if (fmt == DBL) {
733 r1 &= ~1;
734 if (class != 1)
735 t &= ~1;
736 }
737
738 switch (class) {
739 case 0:
740 switch (subop) {
741 case 0: /* unimplemented */
742 case 1:
743 return(MAJOR_0E_EXCP);
744 case 2: /* FCPY */
745 switch (fmt) {
746 case 2:
747 case 3:
748 return(MAJOR_0E_EXCP);
749 case 1: /* double */
750 fpregs[t+1] = fpregs[r1+1];
751 case 0: /* single */
752 fpregs[t] = fpregs[r1];
753 return(NOEXCEPTION);
754 }
755 case 3: /* FABS */
756 switch (fmt) {
757 case 2:
758 case 3:
759 return(MAJOR_0E_EXCP);
760 case 1: /* double */
761 fpregs[t+1] = fpregs[r1+1];
762 case 0: /* single */
763 fpregs[t] = fpregs[r1] & 0x7fffffff;
764 return(NOEXCEPTION);
765 }
766 case 6: /* FNEG */
767 switch (fmt) {
768 case 2:
769 case 3:
770 return(MAJOR_0E_EXCP);
771 case 1: /* double */
772 fpregs[t+1] = fpregs[r1+1];
773 case 0: /* single */
774 fpregs[t] = fpregs[r1] ^ 0x80000000;
775 return(NOEXCEPTION);
776 }
777 case 7: /* FNEGABS */
778 switch (fmt) {
779 case 2:
780 case 3:
781 return(MAJOR_0E_EXCP);
782 case 1: /* double */
783 fpregs[t+1] = fpregs[r1+1];
784 case 0: /* single */
785 fpregs[t] = fpregs[r1] | 0x80000000;
786 return(NOEXCEPTION);
787 }
788 case 4: /* FSQRT */
789 switch (fmt) {
790 case 0:
791 return(sgl_fsqrt(&fpregs[r1],0,
792 &fpregs[t], status));
793 case 1:
794 return(dbl_fsqrt(&fpregs[r1],0,
795 &fpregs[t], status));
796 case 2:
797 case 3:
798 return(MAJOR_0E_EXCP);
799 }
800 case 5: /* FRMD */
801 switch (fmt) {
802 case 0:
803 return(sgl_frnd(&fpregs[r1],0,
804 &fpregs[t], status));
805 case 1:
806 return(dbl_frnd(&fpregs[r1],0,
807 &fpregs[t], status));
808 case 2:
809 case 3:
810 return(MAJOR_0E_EXCP);
811 }
812 } /* end of switch (subop */
813
814 case 1: /* class 1 */
815 df = extru(ir,fpdfpos,2); /* get dest format */
816 /*
817 * Fix Crashme problem (writing to 31R in double precision)
818 * here too.
819 */
820 if (df == DBL) {
821 t &= ~1;
822 }
823 if ((df & 2) || (fmt & 2))
824 return(MAJOR_0E_EXCP);
825
826 fmt = (fmt << 1) | df;
827 switch (subop) {
828 case 0: /* FCNVFF */
829 switch(fmt) {
830 case 0: /* sgl/sgl */
831 return(MAJOR_0E_EXCP);
832 case 1: /* sgl/dbl */
833 return(sgl_to_dbl_fcnvff(&fpregs[r1],0,
834 &fpregs[t],status));
835 case 2: /* dbl/sgl */
836 return(dbl_to_sgl_fcnvff(&fpregs[r1],0,
837 &fpregs[t],status));
838 case 3: /* dbl/dbl */
839 return(MAJOR_0E_EXCP);
840 }
841 case 1: /* FCNVXF */
842 switch(fmt) {
843 case 0: /* sgl/sgl */
844 return(sgl_to_sgl_fcnvxf(&fpregs[r1],0,
845 &fpregs[t],status));
846 case 1: /* sgl/dbl */
847 return(sgl_to_dbl_fcnvxf(&fpregs[r1],0,
848 &fpregs[t],status));
849 case 2: /* dbl/sgl */
850 return(dbl_to_sgl_fcnvxf(&fpregs[r1],0,
851 &fpregs[t],status));
852 case 3: /* dbl/dbl */
853 return(dbl_to_dbl_fcnvxf(&fpregs[r1],0,
854 &fpregs[t],status));
855 }
856 case 2: /* FCNVFX */
857 switch(fmt) {
858 case 0: /* sgl/sgl */
859 return(sgl_to_sgl_fcnvfx(&fpregs[r1],0,
860 &fpregs[t],status));
861 case 1: /* sgl/dbl */
862 return(sgl_to_dbl_fcnvfx(&fpregs[r1],0,
863 &fpregs[t],status));
864 case 2: /* dbl/sgl */
865 return(dbl_to_sgl_fcnvfx(&fpregs[r1],0,
866 &fpregs[t],status));
867 case 3: /* dbl/dbl */
868 return(dbl_to_dbl_fcnvfx(&fpregs[r1],0,
869 &fpregs[t],status));
870 }
871 case 3: /* FCNVFXT */
872 switch(fmt) {
873 case 0: /* sgl/sgl */
874 return(sgl_to_sgl_fcnvfxt(&fpregs[r1],0,
875 &fpregs[t],status));
876 case 1: /* sgl/dbl */
877 return(sgl_to_dbl_fcnvfxt(&fpregs[r1],0,
878 &fpregs[t],status));
879 case 2: /* dbl/sgl */
880 return(dbl_to_sgl_fcnvfxt(&fpregs[r1],0,
881 &fpregs[t],status));
882 case 3: /* dbl/dbl */
883 return(dbl_to_dbl_fcnvfxt(&fpregs[r1],0,
884 &fpregs[t],status));
885 }
886 case 5: /* FCNVUF (PA2.0 only) */
887 switch(fmt) {
888 case 0: /* sgl/sgl */
889 return(sgl_to_sgl_fcnvuf(&fpregs[r1],0,
890 &fpregs[t],status));
891 case 1: /* sgl/dbl */
892 return(sgl_to_dbl_fcnvuf(&fpregs[r1],0,
893 &fpregs[t],status));
894 case 2: /* dbl/sgl */
895 return(dbl_to_sgl_fcnvuf(&fpregs[r1],0,
896 &fpregs[t],status));
897 case 3: /* dbl/dbl */
898 return(dbl_to_dbl_fcnvuf(&fpregs[r1],0,
899 &fpregs[t],status));
900 }
901 case 6: /* FCNVFU (PA2.0 only) */
902 switch(fmt) {
903 case 0: /* sgl/sgl */
904 return(sgl_to_sgl_fcnvfu(&fpregs[r1],0,
905 &fpregs[t],status));
906 case 1: /* sgl/dbl */
907 return(sgl_to_dbl_fcnvfu(&fpregs[r1],0,
908 &fpregs[t],status));
909 case 2: /* dbl/sgl */
910 return(dbl_to_sgl_fcnvfu(&fpregs[r1],0,
911 &fpregs[t],status));
912 case 3: /* dbl/dbl */
913 return(dbl_to_dbl_fcnvfu(&fpregs[r1],0,
914 &fpregs[t],status));
915 }
916 case 7: /* FCNVFUT (PA2.0 only) */
917 switch(fmt) {
918 case 0: /* sgl/sgl */
919 return(sgl_to_sgl_fcnvfut(&fpregs[r1],0,
920 &fpregs[t],status));
921 case 1: /* sgl/dbl */
922 return(sgl_to_dbl_fcnvfut(&fpregs[r1],0,
923 &fpregs[t],status));
924 case 2: /* dbl/sgl */
925 return(dbl_to_sgl_fcnvfut(&fpregs[r1],0,
926 &fpregs[t],status));
927 case 3: /* dbl/dbl */
928 return(dbl_to_dbl_fcnvfut(&fpregs[r1],0,
929 &fpregs[t],status));
930 }
931 case 4: /* undefined */
932 return(MAJOR_0C_EXCP);
933 } /* end of switch subop */
934 case 2: /* class 2 */
935 /*
936 * Be careful out there.
937 * Crashme can generate cases where FR31R is specified
938 * as the source or target of a double precision operation.
939 * Since we just pass the address of the floating-point
940 * register to the emulation routines, this can cause
941 * corruption of fpzeroreg.
942 */
943 if (fmt == DBL)
944 r2 = (extru(ir,fpr2pos,5)<<1);
945 else
946 r2 = ((extru(ir,fpr2pos,5)<<1)|(extru(ir,fpxr2pos,1)));
947 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];
948 if (r2 == 0)
949 r2 = fpzeroreg;
950 if (fpu_type_flags & PA2_0_FPU_FLAG) {
951 /* FTEST if nullify bit set, otherwise FCMP */
952 if (extru(ir, fpnulpos, 1)) { /* FTEST */
953 /* not legal */
954 return(MAJOR_0E_EXCP);
955 } else { /* FCMP */
956 switch (fmt) {
957 /*
958 * fmt is only 1 bit long
959 */
960 case 0:
961 retval = sgl_fcmp(&fpregs[r1],
962 &fpregs[r2],extru(ir,fptpos,5),
963 &local_status);
964 update_status_cbit(status,local_status,
965 fpu_type_flags, subop);
966 return(retval);
967 case 1:
968 retval = dbl_fcmp(&fpregs[r1],
969 &fpregs[r2],extru(ir,fptpos,5),
970 &local_status);
971 update_status_cbit(status,local_status,
972 fpu_type_flags, subop);
973 return(retval);
974 }
975 }
976 } /* end of if for PA2.0 */
977 else { /* PA1.0 & PA1.1 */
978 switch (subop) {
979 case 1:
980 case 2:
981 case 3:
982 case 4:
983 case 5:
984 case 6:
985 case 7:
986 return(MAJOR_0E_EXCP);
987 case 0: /* FCMP */
988 switch (fmt) {
989 /*
990 * fmt is only 1 bit long
991 */
992 case 0:
993 retval = sgl_fcmp(&fpregs[r1],
994 &fpregs[r2],extru(ir,fptpos,5),
995 &local_status);
996 update_status_cbit(status,local_status,
997 fpu_type_flags, subop);
998 return(retval);
999 case 1:
1000 retval = dbl_fcmp(&fpregs[r1],
1001 &fpregs[r2],extru(ir,fptpos,5),
1002 &local_status);
1003 update_status_cbit(status,local_status,
1004 fpu_type_flags, subop);
1005 return(retval);
1006 }
1007 } /* end of switch subop */
1008 } /* end of else for PA1.0 & PA1.1 */
1009 case 3: /* class 3 */
1010 /*
1011 * Be careful out there.
1012 * Crashme can generate cases where FR31R is specified
1013 * as the source or target of a double precision operation.
1014 * Since we just pass the address of the floating-point
1015 * register to the emulation routines, this can cause
1016 * corruption of fpzeroreg.
1017 */
1018 if (fmt == DBL)
1019 r2 = (extru(ir,fpr2pos,5)<<1);
1020 else
1021 r2 = ((extru(ir,fpr2pos,5)<<1)|(extru(ir,fpxr2pos,1)));
1022 if (r2 == 0)
1023 r2 = fpzeroreg;
1024 switch (subop) {
1025 case 5:
1026 case 6:
1027 case 7:
1028 return(MAJOR_0E_EXCP);
1029
1030 /*
1031 * Note that fmt is only 1 bit for class 3 */
1032 case 0: /* FADD */
1033 switch (fmt) {
1034 case 0:
1035 return(sgl_fadd(&fpregs[r1],&fpregs[r2],
1036 &fpregs[t],status));
1037 case 1:
1038 return(dbl_fadd(&fpregs[r1],&fpregs[r2],
1039 &fpregs[t],status));
1040 }
1041 case 1: /* FSUB */
1042 switch (fmt) {
1043 case 0:
1044 return(sgl_fsub(&fpregs[r1],&fpregs[r2],
1045 &fpregs[t],status));
1046 case 1:
1047 return(dbl_fsub(&fpregs[r1],&fpregs[r2],
1048 &fpregs[t],status));
1049 }
1050 case 2: /* FMPY or XMPYU */
1051 /*
1052 * check for integer multiply (x bit set)
1053 */
1054 if (extru(ir,fpxpos,1)) {
1055 /*
1056 * emulate XMPYU
1057 */
1058 switch (fmt) {
1059 case 0:
1060 /*
1061 * bad instruction if t specifies
1062 * the right half of a register
1063 */
1064 if (t & 1)
1065 return(MAJOR_0E_EXCP);
1066 BUG();
1067 /* unsupported
1068 * impyu(&fpregs[r1],&fpregs[r2],
1069 * &fpregs[t]);
1070 */
1071 return(NOEXCEPTION);
1072 case 1:
1073 return(MAJOR_0E_EXCP);
1074 }
1075 }
1076 else { /* FMPY */
1077 switch (fmt) {
1078 case 0:
1079 return(sgl_fmpy(&fpregs[r1],
1080 &fpregs[r2],&fpregs[t],status));
1081 case 1:
1082 return(dbl_fmpy(&fpregs[r1],
1083 &fpregs[r2],&fpregs[t],status));
1084 }
1085 }
1086 case 3: /* FDIV */
1087 switch (fmt) {
1088 case 0:
1089 return(sgl_fdiv(&fpregs[r1],&fpregs[r2],
1090 &fpregs[t],status));
1091 case 1:
1092 return(dbl_fdiv(&fpregs[r1],&fpregs[r2],
1093 &fpregs[t],status));
1094 }
1095 case 4: /* FREM */
1096 switch (fmt) {
1097 case 0:
1098 return(sgl_frem(&fpregs[r1],&fpregs[r2],
1099 &fpregs[t],status));
1100 case 1:
1101 return(dbl_frem(&fpregs[r1],&fpregs[r2],
1102 &fpregs[t],status));
1103 }
1104 } /* end of class 3 switch */
1105 } /* end of switch(class) */
1106
1107 /* If we get here, something is really wrong! */
1108 return(MAJOR_0E_EXCP);
1109 }
1110
1111
1112 /*
1113 * routine to decode the 06 (FMPYADD and FMPYCFXT) instruction
1114 */
1115 static u_int
1116 decode_06(ir,fpregs)
1117 u_int ir;
1118 u_int fpregs[];
1119 {
1120 u_int rm1, rm2, tm, ra, ta; /* operands */
1121 u_int fmt;
1122 u_int error = 0;
1123 u_int status;
1124 u_int fpu_type_flags;
1125 union {
1126 double dbl;
1127 float flt;
1128 struct { u_int i1; u_int i2; } ints;
1129 } mtmp, atmp;
1130
1131
1132 status = fpregs[0]; /* use a local copy of status reg */
1133 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; /* get fpu type flags */
1134 fmt = extru(ir, fpmultifmt, 1); /* get sgl/dbl flag */
1135 if (fmt == 0) { /* DBL */
1136 rm1 = extru(ir, fprm1pos, 5) * sizeof(double)/sizeof(u_int);
1137 if (rm1 == 0)
1138 rm1 = fpzeroreg;
1139 rm2 = extru(ir, fprm2pos, 5) * sizeof(double)/sizeof(u_int);
1140 if (rm2 == 0)
1141 rm2 = fpzeroreg;
1142 tm = extru(ir, fptmpos, 5) * sizeof(double)/sizeof(u_int);
1143 if (tm == 0)
1144 return(MAJOR_06_EXCP);
1145 ra = extru(ir, fprapos, 5) * sizeof(double)/sizeof(u_int);
1146 ta = extru(ir, fptapos, 5) * sizeof(double)/sizeof(u_int);
1147 if (ta == 0)
1148 return(MAJOR_06_EXCP);
1149
1150 if (fpu_type_flags & TIMEX_ROLEX_FPU_MASK) {
1151
1152 if (ra == 0) {
1153 /* special case FMPYCFXT, see sgl case below */
1154 if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],
1155 &mtmp.ints.i1,&status))
1156 error = 1;
1157 if (dbl_to_sgl_fcnvfxt(&fpregs[ta],
1158 &atmp.ints.i1,&atmp.ints.i1,&status))
1159 error = 1;
1160 }
1161 else {
1162
1163 if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1164 &status))
1165 error = 1;
1166 if (dbl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,
1167 &status))
1168 error = 1;
1169 }
1170 }
1171
1172 else
1173
1174 {
1175 if (ra == 0)
1176 ra = fpzeroreg;
1177
1178 if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1179 &status))
1180 error = 1;
1181 if (dbl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,
1182 &status))
1183 error = 1;
1184
1185 }
1186
1187 if (error)
1188 return(MAJOR_06_EXCP);
1189 else {
1190 /* copy results */
1191 fpregs[tm] = mtmp.ints.i1;
1192 fpregs[tm+1] = mtmp.ints.i2;
1193 fpregs[ta] = atmp.ints.i1;
1194 fpregs[ta+1] = atmp.ints.i2;
1195 fpregs[0] = status;
1196 return(NOEXCEPTION);
1197 }
1198 }
1199 else { /* SGL */
1200 /*
1201 * calculate offsets for single precision numbers
1202 * See table 6-14 in PA-89 architecture for mapping
1203 */
1204 rm1 = (extru(ir,fprm1pos,4) | 0x10 ) << 1; /* get offset */
1205 rm1 |= extru(ir,fprm1pos-4,1); /* add right word offset */
1206
1207 rm2 = (extru(ir,fprm2pos,4) | 0x10 ) << 1; /* get offset */
1208 rm2 |= extru(ir,fprm2pos-4,1); /* add right word offset */
1209
1210 tm = (extru(ir,fptmpos,4) | 0x10 ) << 1; /* get offset */
1211 tm |= extru(ir,fptmpos-4,1); /* add right word offset */
1212
1213 ra = (extru(ir,fprapos,4) | 0x10 ) << 1; /* get offset */
1214 ra |= extru(ir,fprapos-4,1); /* add right word offset */
1215
1216 ta = (extru(ir,fptapos,4) | 0x10 ) << 1; /* get offset */
1217 ta |= extru(ir,fptapos-4,1); /* add right word offset */
1218
1219 if (ra == 0x20 &&(fpu_type_flags & TIMEX_ROLEX_FPU_MASK)) {
1220 /* special case FMPYCFXT (really 0)
1221 * This instruction is only present on the Timex and
1222 * Rolex fpu's in so if it is the special case and
1223 * one of these fpu's we run the FMPYCFXT instruction
1224 */
1225 if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1226 &status))
1227 error = 1;
1228 if (sgl_to_sgl_fcnvfxt(&fpregs[ta],&atmp.ints.i1,
1229 &atmp.ints.i1,&status))
1230 error = 1;
1231 }
1232 else {
1233 if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1234 &status))
1235 error = 1;
1236 if (sgl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,
1237 &status))
1238 error = 1;
1239 }
1240 if (error)
1241 return(MAJOR_06_EXCP);
1242 else {
1243 /* copy results */
1244 fpregs[tm] = mtmp.ints.i1;
1245 fpregs[ta] = atmp.ints.i1;
1246 fpregs[0] = status;
1247 return(NOEXCEPTION);
1248 }
1249 }
1250 }
1251
1252 /*
1253 * routine to decode the 26 (FMPYSUB) instruction
1254 */
1255 static u_int
1256 decode_26(ir,fpregs)
1257 u_int ir;
1258 u_int fpregs[];
1259 {
1260 u_int rm1, rm2, tm, ra, ta; /* operands */
1261 u_int fmt;
1262 u_int error = 0;
1263 u_int status;
1264 union {
1265 double dbl;
1266 float flt;
1267 struct { u_int i1; u_int i2; } ints;
1268 } mtmp, atmp;
1269
1270
1271 status = fpregs[0];
1272 fmt = extru(ir, fpmultifmt, 1); /* get sgl/dbl flag */
1273 if (fmt == 0) { /* DBL */
1274 rm1 = extru(ir, fprm1pos, 5) * sizeof(double)/sizeof(u_int);
1275 if (rm1 == 0)
1276 rm1 = fpzeroreg;
1277 rm2 = extru(ir, fprm2pos, 5) * sizeof(double)/sizeof(u_int);
1278 if (rm2 == 0)
1279 rm2 = fpzeroreg;
1280 tm = extru(ir, fptmpos, 5) * sizeof(double)/sizeof(u_int);
1281 if (tm == 0)
1282 return(MAJOR_26_EXCP);
1283 ra = extru(ir, fprapos, 5) * sizeof(double)/sizeof(u_int);
1284 if (ra == 0)
1285 return(MAJOR_26_EXCP);
1286 ta = extru(ir, fptapos, 5) * sizeof(double)/sizeof(u_int);
1287 if (ta == 0)
1288 return(MAJOR_26_EXCP);
1289
1290 if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,&status))
1291 error = 1;
1292 if (dbl_fsub(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,&status))
1293 error = 1;
1294 if (error)
1295 return(MAJOR_26_EXCP);
1296 else {
1297 /* copy results */
1298 fpregs[tm] = mtmp.ints.i1;
1299 fpregs[tm+1] = mtmp.ints.i2;
1300 fpregs[ta] = atmp.ints.i1;
1301 fpregs[ta+1] = atmp.ints.i2;
1302 fpregs[0] = status;
1303 return(NOEXCEPTION);
1304 }
1305 }
1306 else { /* SGL */
1307 /*
1308 * calculate offsets for single precision numbers
1309 * See table 6-14 in PA-89 architecture for mapping
1310 */
1311 rm1 = (extru(ir,fprm1pos,4) | 0x10 ) << 1; /* get offset */
1312 rm1 |= extru(ir,fprm1pos-4,1); /* add right word offset */
1313
1314 rm2 = (extru(ir,fprm2pos,4) | 0x10 ) << 1; /* get offset */
1315 rm2 |= extru(ir,fprm2pos-4,1); /* add right word offset */
1316
1317 tm = (extru(ir,fptmpos,4) | 0x10 ) << 1; /* get offset */
1318 tm |= extru(ir,fptmpos-4,1); /* add right word offset */
1319
1320 ra = (extru(ir,fprapos,4) | 0x10 ) << 1; /* get offset */
1321 ra |= extru(ir,fprapos-4,1); /* add right word offset */
1322
1323 ta = (extru(ir,fptapos,4) | 0x10 ) << 1; /* get offset */
1324 ta |= extru(ir,fptapos-4,1); /* add right word offset */
1325
1326 if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,&status))
1327 error = 1;
1328 if (sgl_fsub(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,&status))
1329 error = 1;
1330 if (error)
1331 return(MAJOR_26_EXCP);
1332 else {
1333 /* copy results */
1334 fpregs[tm] = mtmp.ints.i1;
1335 fpregs[ta] = atmp.ints.i1;
1336 fpregs[0] = status;
1337 return(NOEXCEPTION);
1338 }
1339 }
1340
1341 }
1342
1343 /*
1344 * routine to decode the 2E (FMPYFADD,FMPYNFADD) instructions
1345 */
1346 static u_int
1347 decode_2e(ir,fpregs)
1348 u_int ir;
1349 u_int fpregs[];
1350 {
1351 u_int rm1, rm2, ra, t; /* operands */
1352 u_int fmt;
1353
1354 fmt = extru(ir,fpfmtpos,1); /* get fmt completer */
1355 if (fmt == DBL) { /* DBL */
1356 rm1 = extru(ir,fprm1pos,5) * sizeof(double)/sizeof(u_int);
1357 if (rm1 == 0)
1358 rm1 = fpzeroreg;
1359 rm2 = extru(ir,fprm2pos,5) * sizeof(double)/sizeof(u_int);
1360 if (rm2 == 0)
1361 rm2 = fpzeroreg;
1362 ra = ((extru(ir,fpraupos,3)<<2)|(extru(ir,fpralpos,3)>>1)) *
1363 sizeof(double)/sizeof(u_int);
1364 if (ra == 0)
1365 ra = fpzeroreg;
1366 t = extru(ir,fptpos,5) * sizeof(double)/sizeof(u_int);
1367 if (t == 0)
1368 return(MAJOR_2E_EXCP);
1369
1370 if (extru(ir,fpfusedsubop,1)) { /* fmpyfadd or fmpynfadd? */
1371 return(dbl_fmpynfadd(&fpregs[rm1], &fpregs[rm2],
1372 &fpregs[ra], &fpregs[0], &fpregs[t]));
1373 } else {
1374 return(dbl_fmpyfadd(&fpregs[rm1], &fpregs[rm2],
1375 &fpregs[ra], &fpregs[0], &fpregs[t]));
1376 }
1377 } /* end DBL */
1378 else { /* SGL */
1379 rm1 = (extru(ir,fprm1pos,5)<<1)|(extru(ir,fpxrm1pos,1));
1380 if (rm1 == 0)
1381 rm1 = fpzeroreg;
1382 rm2 = (extru(ir,fprm2pos,5)<<1)|(extru(ir,fpxrm2pos,1));
1383 if (rm2 == 0)
1384 rm2 = fpzeroreg;
1385 ra = (extru(ir,fpraupos,3)<<3)|extru(ir,fpralpos,3);
1386 if (ra == 0)
1387 ra = fpzeroreg;
1388 t = ((extru(ir,fptpos,5)<<1)|(extru(ir,fpxtpos,1)));
1389 if (t == 0)
1390 return(MAJOR_2E_EXCP);
1391
1392 if (extru(ir,fpfusedsubop,1)) { /* fmpyfadd or fmpynfadd? */
1393 return(sgl_fmpynfadd(&fpregs[rm1], &fpregs[rm2],
1394 &fpregs[ra], &fpregs[0], &fpregs[t]));
1395 } else {
1396 return(sgl_fmpyfadd(&fpregs[rm1], &fpregs[rm2],
1397 &fpregs[ra], &fpregs[0], &fpregs[t]));
1398 }
1399 } /* end SGL */
1400 }
1401
1402 /*
1403 * update_status_cbit
1404 *
1405 * This routine returns the correct FP status register value in
1406 * *status, based on the C-bit & V-bit returned by the FCMP
1407 * emulation routine in new_status. The architecture type
1408 * (PA83, PA89 or PA2.0) is available in fpu_type. The y_field
1409 * and the architecture type are used to determine what flavor
1410 * of FCMP is being emulated.
1411 */
1412 static void
1413 update_status_cbit(status, new_status, fpu_type, y_field)
1414 u_int *status, new_status;
1415 u_int fpu_type;
1416 u_int y_field;
1417 {
1418 /*
1419 * For PA89 FPU's which implement the Compare Queue and
1420 * for PA2.0 FPU's, update the Compare Queue if the y-field = 0,
1421 * otherwise update the specified bit in the Compare Array.
1422 * Note that the y-field will always be 0 for non-PA2.0 FPU's.
1423 */
1424 if ((fpu_type & TIMEX_EXTEN_FLAG) ||
1425 (fpu_type & ROLEX_EXTEN_FLAG) ||
1426 (fpu_type & PA2_0_FPU_FLAG)) {
1427 if (y_field == 0) {
1428 *status = ((*status & 0x04000000) >> 5) | /* old Cbit */
1429 ((*status & 0x003ff000) >> 1) | /* old CQ */
1430 (new_status & 0xffc007ff); /* all other bits*/
1431 } else {
1432 *status = (*status & 0x04000000) | /* old Cbit */
1433 ((new_status & 0x04000000) >> (y_field+4)) |
1434 (new_status & ~0x04000000 & /* other bits */
1435 ~(0x04000000 >> (y_field+4)));
1436 }
1437 }
1438 /* if PA83, just update the C-bit */
1439 else {
1440 *status = new_status;
1441 }
1442 }
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